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Showing papers on "Precipitated silica published in 2018"


Journal ArticleDOI
TL;DR: In this paper, the effect of white carbon black (fumed silica and precipitated silica) on the mechanics and friction properties of silicone rubber was analyzed and the tensile strength, tearing strength, and friction property was analyzed.
Abstract: This paper analysed the effect of different white carbon black (fumed silica and precipitated silica) on the mechanics and friction property of silicone rubber. The tensile strength, tearing streng...

25 citations


Journal ArticleDOI
TL;DR: In this paper, amorphous precipitated silica (APS) was synthesized from alkaline dissolution of olivine using a mixture of NaOH and KOH and characterized; this combination resulted in better kinetics than those of the separate components.
Abstract: The high worldwide demand for amorphous precipitated silica (APS) materials, millions of tons worth billions of dollars, makes it worthwhile to further expand the techniques for synthesizing new, cheap, and environmentally friendly resources In this research, amorphous precipitated silica was synthesized from alkaline dissolution of olivine using a mixture of NaOH and KOH and characterized; this combination resulted in better kinetics than those of the separate components Experimental parameters (concentration of alkali, liquid/solid ratio, reaction time, and temperature) were optimized to provide maximum recovery of APS from olivine dissolution, which was then characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET) N2 adsorption–desorption measurements, and thermogravimetric analysis (TGA) The APS possessed suitable morphology for use as an additive in polymers and in catalysis: a particle size below 10 nm, pore width of 559 nm, BJH adsorption cumulative pore volume of 096 cm3 g−1, BET surface area of 6708 m2 g−1, and Langmuir surface area of 8593 m2 g−1 The apparent activation energy of olivine dissolution with a mixture of NaOH/KOH was 436 kJ mol−1 The steps involved in creation of APS from olivine resulted in opportunities for carbon dioxide absorption, which could contribute to the production of valuable materials through decarbonation of exhaust gases

19 citations


Journal ArticleDOI
TL;DR: In this article, the same P25 material has been encapsulated within a “classical” MCM-41 mesoporous silica and a precipitated silica, and it has been observed that the P25 samples encapsulated in silica present improved CO2 production rates per mol of P25 in the photooxidation of propene, compared to P25 alone as well as the physical mixture of the two components.
Abstract: In this work, we have performed the encapsulation of a reference TiO2 material (P25) in spherical silica with hierarchical porosity using a sol-gel methodology. The same P25 material has been encapsulated within a “classical” MCM-41 mesoporous silica and a precipitated silica. The materials synthesized in this work were characterized by ICP-OES, SEM, TEM, EDX, XRD, UV–VIS, TG, and nitrogen adsorption. It has been observed that the P25 samples encapsulated in silica present improved CO2 production rates per mol of P25 in the photooxidation of propene, compared to P25 alone as well as the physical mixture of the two components. Moreover, the sample with a low content of P25 encapsulated in silica with hierarchical porosity presents the highest CO2 production rates per mol of P25 with respect to the other P25/silica samples, due to a better accessibility of the titania phase and improved illumination of the active phase. Furthermore, the hierarchical porosity of the silica shell material favours mass transport and an increased concentration of reagents by adsorption near the titania phase. This improvement in photocatalytic activity is obtained by following a simple and reproducible synthesis methodology that employs an established silica preparation protocol. Thus, the choice of a silica with an adequate porosity for this application is proven to be a promising advancement in the development of efficient photocatalysts.

15 citations


Journal ArticleDOI
TL;DR: In this paper, polypropylene/silica (PP/SiO2) composites containing 5% of untreated precipitated silica were compatibilized with different coupling agents like maleic anhydride-grafted polyethylene, glycerol monostearate (GMS), ethylene acrylic acid zinc ionomer and a second polymer phase of polyamide 6 (PA6).
Abstract: In this study, polypropylene/silica (PP/SiO2) composites containing 5 wt% of untreated precipitated silica were compatibilized with different coupling agents like maleic anhydride-grafted polypropylene, glycerol monostearate (GMS), ethylene acrylic acid zinc ionomer and a second polymer phase of polyamide 6 (PA6). The composites were melt-compounded by two different processes: either by direct melt mixing or by dilution of a masterbatch (two-step mixing) in a twin screw extruder using both injected water and high shear stress as a new processing method. The various samples were characterized by Fourier transform infrared spectroscopy (FTIR), thermal analysis, morphological and rheological measurements in order to determine the compatibilizers effects between the matrix and the untreated filler. Hence, atomic force microscopy observations revealed that the untreated silica was dispersed more homogeneously in the presence of PA6 and GMS compatibilizers when water injection is used as one. However, the roughness values are lower in this case. FTIR analysis confirmed the existence of interfacial interactions between OH groups of SiO2 and polar groups of compatibilizers. The storage (G′), loss moduli (G″) and the dynamic viscosity of PP/SiO2 composites increased with the incorporation of PA6. Furthermore, the thermal stability of the compatibilized PP/SiO2 compounds enhanced significantly in the presence of water. An improvement in decomposition temperature of about 50 °C was obtained compared to uncoupled composites.

13 citations


Journal ArticleDOI
TL;DR: In this paper, precipitated silica agglomerates (referred to as PSA) were crosslinked with TEMPO-oxidized cellulose nanofibrils (TO-CNF) as a reinforcement in the presence of 3-aminopropyltriethoxysilane (APTES), via a facile dual metal synthesis approach.
Abstract: Silicon-containing compounds such as silica are effective heavy metal sorbents which can be employed in many applications. This is attributed to the porous nature of hydrothermally-stable silica, endowing such materials with high surface area and rich surface chemistry, all responsible for improving adsorption and desorption performance. However, to this day, the wide application of silica is limited by its skeletal brittleness and high production cost coupled with a risky traditional supercritical drying method. To solve the named problems, herein, precipitated silica agglomerates (referred to as PSA) was crosslinked with TEMPO-oxidized cellulose nanofibrils (TO-CNF) as a reinforcement in the presence of 3-aminopropyltriethoxysilane (APTES), via a facile dual metal synthesis approach, is reported. The resultant new silica-based sponges (TO-CNF PSA) showed desirable properties of flexibility, porosity and multifaceted sorption of various heavy metals with re-usability. The experimental results showed maximum adsorption capacities of 157.7, 33.22, 140.3 and 130.5 mg g−1 for Pb(II), Hg(II), Cr(III) and Cd(II) ions, respectively. Such a facile approach to modify silica materials by attaching active groups together with reinforcement can provide improved and reliable silica-based materials which can be applied in water treatment, gas purification, thermal insulation etc.

12 citations


Journal ArticleDOI
03 Jan 2018-Polymer
TL;DR: In this paper, the linear rheology of natural rubber compounds varies with the loading of precipitated silica, short nylon fiber, or both, and a filler dimension-dependent hydrodynamic-to-non-hydrodynamic transition by applying the time-concentration superposition principle is described.

10 citations


Journal ArticleDOI
TL;DR: The morphological analysis reveals that the alkoxy-based silica particles resemble a raspberry structure when the synthesis of the silica was carried out in the presence of polymer molecules and represent a much more open silica-network structure, while in the absence of the polymer, the morphology is found to be different.
Abstract: A sol-gel transformation of liquid silica precursor to solid silica particles was carried out in a one pot synthesis way where a solution of styrene butadiene elastomer (S-SBR) was present. The composites, thus produced, offered remarkable improvements of mechanical and dynamic mechanical performances as compared with precipitated silica. The morphological analysis reveals that the alkoxy-based silica particles resemble a raspberry structure when the synthesis of the silica was carried out in presence of polymer molecules and represent a much more open silica-network structure. However, in absence of polymer the morphology of the silica particles is found to be different. It is envisaged that the special morphology of the in-situ synthesized silica particles contributes to the superior reinforcement effects which are associated with a strong silica-rubber interaction by rubber chains trapped inside the raspberry-like silica aggregates. Therefore, the interfaces are characterized in detail by low-field sol...

8 citations



Journal ArticleDOI
TL;DR: In this article, the effect of Y 2 O 3 on the sintering behavior of mullite compacts was investigated and it was shown that rapid mullitization occurred through nucleation and normal grain growth due to the formation of yttrious silicate glassy phase.

4 citations


Patent
20 Apr 2018
TL;DR: In this paper, a preparation method of precipitated silica reinforced silicon rubber is described, in which the silicon rubber material is prepared from the following raw materials in parts by weight: 100 parts of raw rubber of methyl vinyl silicone rubber, 40 to 50 parts of white carbon black, 3 to 3.6 parts of structurized controlling agents, 0.3 to 0.8 part of hydrogen-containing silicone oil and 0.4 part of mold releasing agents.
Abstract: The invention discloses a preparation method of precipitated silica reinforced silicon rubber. The preparation method is characterized in that the silicon rubber is prepared from the following raw materials in parts by weight: 100 parts of raw rubber of methyl vinyl silicone rubber, 40 to 50 parts of precipitated silica reinforced white carbon black, 3 to 3.6 parts of structurized controlling agents, 0.3 to 0.8 part of hydrogen-containing silicone oil and 0.2 to 0.4 part of mold releasing agents. According to the preparation method, firstly, the weighed raw materials of 100 parts of raw rubberof raw rubber of methyl vinyl silicone rubber, 0.2 to 0.4 part of mold releasing agents and 0.3 to 0.8 part of hydrogen-containing silicone oil are fed into an internal mixer; then, 40 to 50 parts ofwhite carbon black are added into the internal mixer in three to five times; 3 to 3.6 parts of hydroxyl silicone oil are added; then, mixing and kneading are performed; the temperature is controlledto be 50 to 80 DEG C; after the internal mixing conglobation and still standing, the temperature is raised; vacuum pumping is performed; finally, the silicon rubber materials subjected to the vacuum pumping are subjected to remilling on a milling machine; after the rubber materials are smooth, filtering and packaging are performed to obtain a product. The preparation method has the advantages thatthe production process is simple; the tearing intensity is high; the effect is good, and the like.

4 citations


Patent
16 Nov 2018
TL;DR: In this paper, a method for precipitated high-dispersion high-adsorption silica and a preparation method for high-adversarial high-Dispersion silica is described.
Abstract: The invention belongs to the technical field of precipitated silica and particularly relates to high-adsorption high-dispersion silica and a preparation method thereof. The preparation method comprises: 1, adding a Carbomer resin into a sodium sulfate solution and stirring the solution to obtain a mixed solution, 2, adding the mixed solution into a reactor, adding a sodium silicate solution into the mixed solution under stirring, heating the solution to 80-90 DEG C, adding sulfuric acid into the solution, stopping acid addition when the pH value is 8.0-9.0, and carrying out aging, 3, adding asodium silicate solution and sulfuric acid into the aged material together, controlling pH in 8.0-9.0, then adding sulfuric acid into the solution after all the sodium silicate is used, stopping acidfeeding when the pH value is 3.5-4.0, and carrying out stirring to obtain silica slurry, and 4, press-filtering the silica slurry and carrying out washing and spray-drying to obtain silica particles with the sizes of 18-25 microns. The silica particles are small and uniform, have high adsorption and high dispersion characteristics, can be used as washing assistants, can be directly used in a detergent and has good anti-caking and flowing aid effects.


Proceedings ArticleDOI
13 Jul 2018
TL;DR: In this article, a chemical treatment for the RHA was developed to collect the silica, via a simple method consisting of alkaline extraction and acid precipitation This method can produce finer and visually whiter RHA powder.
Abstract: Rice husk (RH) is a hard shell that protects the rice grain and can be found in abundance in all rice producing countries Burning RH as fuel to generate energy would result in a waste product, rice husk ash (RHA) RHA contains approximately 90 – 98% of silica (SiO2), after undergoing a complete combustion process, which is the highest among other agricultural wastes Silica is one of the commonly used fillers in natural rubber (NR) A chemical treatment for the RHA was developed to collect the silica, via a simple method consisting of alkaline extraction and acid precipitation This method can produce finer and visually whiter RHA powder The effects of the chemical treatment on the particle size and surface area of the silica particles were measured The precipitated silica was then incorporated into NR, using a laboratory-size two-roll mill For comparison, commercial silica was used as a control The cure characteristics and mechanical properties of the vulcanizates were evaluated It was found that the chemical treatment (digestion and precipitation) on RHA has resulted in a significant decrease in its particle size and increase in its specific surface area However, the mechanical properties of the vulcanizates produced from the treated RHA were lower than that of the commercial silica

Journal ArticleDOI
TL;DR: In this paper, the effect of in-situ generated nanosilica particles and precipitated silica particles on the physico-mechanical properties of FKM rubber has been investigated.
Abstract: Fluoroelastomer (FKM) rubber containing different weight percentage of in-situ generated nanosilica particles have been prepared by sol-gel method using tetraethoxysilane (TEOS) as precursor and n-butyl amine as catalyst. FKM rubber with precipitated silica particles have also been prepared to compare the effect of in-situ generated nanosilica particles and precipitated silica particles on the physico-mechanical properties of FKM rubber. It is interesting to note that the FKM rubber containing in-situ generated nanosilica particles display excellent tensile stress-strain properties, rheological properties and thermal properties in comparison to the FKM rubber containing precipitated silica particles. The better performance of the in-situ generated nanosilica particles has been attributed to the good dispersion of in-situ generated nanosilica particles in FKM rubber matrix when compared to the precipitated silica particles. The fourier transform infrared (FTIR) spectroscopy clearly confirms the existence of chemical interaction between the FKM rubber chains and the in-situ generated nanosilica particles which leads to the good dispersion of the nanosilica particles in the rubber matrix. Strain sweep studies confirm the presence of more rubber-filler interaction in FKM rubber filled with in-situ generated nanosilica particles. On the other hand, strain sweep studies confirm the presence of more filler-filler aggregation in FKM rubber filled with precipitated silica particles. The dispersion of the in-situ generated nanosilica particles and precipitated silica particles in the surface and bulk of FKM rubber has been studied by field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). Selected samples have been cured to understand the effect of curing on the efficiency of in-situ generated nanosilica particles and precipitated silica particles on the physico-mechanical properties of FKM rubber.

Patent
20 Mar 2018
TL;DR: In this article, a silicon-rubber composite molding material is designed for a hot die-pressing vulcanization molding production process, which can be applied in production and manufacture of electrical equipment insulation sleeves and products in related fields.
Abstract: The invention relates to the field of silicon-rubber composite materials, and particularly relates to a preparation method of a silicon-rubber composite molding material. The method adopts methylvinylsilicon rubber, fumed silica, precipitated silica, hydroxyl silicone oil, silane coupling agent surface treatment type active aluminium hydroxide, titanate coupling agent surface treatment type aluminium hydroxide, zinc stearate, iron oxide red, cerium oxide and 2,5-dimethyl-2,5-dihexane as raw materials to prepare the silicon-rubber composite molding material with reliable mechanical strength, excellent electrical performance, good hydrophobicity and flame retardance and better outdoor-aging resistance. The silicon-rubber composite molding material is designed for a hot die-pressing vulcanization molding production process, can be applied in production and manufacture of electrical-equipment insulation sleeves and products in related fields, and also can be applied to sealing products and damping and shock-absorbing products for hot die-pressing vulcanization molding.

Patent
03 May 2018
TL;DR: A precipitated silica characterised by the presence of specific acid sites on its surface and a process for its manufacture is described in this article, where the acid sites are identified as acid acid sites.
Abstract: A precipitated silica characterised by the presence of specific acid sites on its surface and a process for its manufacture.

Patent
18 May 2018
TL;DR: A production method of silicon dioxide for toothpaste includes the steps: a) leading tap water into a production water tank and disinfecting the water; b) preparing sodium silicate solution by the disinfected water; c) filtering the silica suspension liquid obtained in the step b) by the water disinfected in step a), washing, drying and crushing filtered precipitates to prepare a precipitated silica product, packaging the precipitated product in a packaging room and discharging the product from warehouse; d) recycling the sodium sulfate solution filtered in step c) into the step
Abstract: A production method of silicon dioxide for toothpaste includes the steps: a) leading tap water into a production water tank and disinfecting the water; b) preparing sodium silicate solution by the disinfected water, adding the sodium silicate solution into sodium sulfate solution with different contents at a certain rate in the stirring process, adding sulfuric acid, controlling the adding rate ofthe sulfuric acid to keep pH (potential of hydrogen) stabilized at 9-10 in the reaction process, continuing adding acid after finishing reaction, adjusting the pH to be 4-5, preparing precipitated silica suspension liquid and aging the liquid; c) filtering the silica suspension liquid obtained in the step b) by the water disinfected in the step a), washing, drying and crushing filtered precipitates to prepare a precipitated silica product, packaging the precipitated silica product in a packaging room and discharging the precipitated silica product from warehouse; d) recycling the sodium sulfate solution filtered in the step c) into the step b), and using the sodium sulfate solution as mother solution for reaction in the step b). The production method has the advantages that the method issimple, raw materials are recycled, high-temperature reaction is omitted, production cost is low, the product is sterile, and the production method is applicable to large-scale production.

Patent
04 Apr 2018
TL;DR: In this paper, the rubber composition for a tire tread according to the present invention comprises a raw rubber and 50-120 parts of precipitated silica relative to 100 parts by weight of the raw rubber, wherein the precipitated Silica is surface-modified with a process aid at a weight ratio of 0.005-0.15, and further comprises an auxiliary reinforcement.
Abstract: The present invention discloses rubber compositions for tire treads. The rubber composition for a tire tread according to the present invention comprises a raw rubber and 50-120 parts by weight of precipitated silica relative to 100 parts by weight of the raw rubber, wherein the precipitated silica is surface-modified with a process aid at a weight ratio of 0.005-0.15, and further comprises an auxiliary reinforcement. In this case, it is possible to prevent an increase in manufacturing costs for equipment change due to application of a high surface area reinforcement and an increase in process time, and at the same time, a blending process according to a viscosity drop can be made smooth, a long-term storage of rubber is easy due to prevention of re-agglomeration of reinforcement. In addition, it is possible to improve tensile properties, rolling resistance, wet road surface braking (wet characteristics), wear characteristics, and handling properties by using rubber with high dispersibility even though it is the high surface area reinforcement. In the present invention, octyltriethoxysilane is used as a process agent at a weight ratio of 0.005-0.15 and is used in surface modification of the precipitated silica.

Patent
06 Jun 2018
TL;DR: In this paper, a rubber composition containing a specialized styrene/butadiene elastomer with molecular weight profile containing a limited low molecular weight content and precipitated silica reinforcement and tire with at least one component, such as a tread, comprised of such rubber composition.
Abstract: The invention relates to a rubber compositions containing a specialized styrene/butadiene elastomer with molecular weight profile containing a limited low molecular weight content and precipitated silica reinforcement and tire with at least one component, such as for example a tread, comprised of such rubber composition.

Patent
04 Dec 2018
TL;DR: In this article, a rubber composition comprised of at least one diene-based elastomer and rubber reinforcement comprised of fibrillated aramid fiber micropulp and reinforcing filler comprised of pre-hydrophobated precipitated silica was presented.
Abstract: This invention relates to a rubber composition comprised of at least one diene-based elastomer and rubber reinforcement comprised of fibrillated aramid fiber micropulp and reinforcing filler comprised of pre-hydrophobated precipitated silica Such fibrillated aramid micropulp is comprised of micronized fibrillated aramid fiber pulp Such pre-hydrophobated precipitated silica is comprised of precipitated silica pre-treated with at least one of bis(3-trialkylsilylalkyl) polysulfide, alkoxyorganomercaptosilane, optionally together with an alkylsilane The invention further relates to such rubber composition wherein said reinforcing filler is comprised of a combination of said pre-hydrophobated precipitated silica as a precipitated silica pre-treated with an alkoxyorganomercaptosilane and a precipitated silica wherein said pre-hydrophobated precipitated silica and said precipitated silica are both hydrophobated in situ within the rubber composition with a bis(3-trialkoxysilylalkyl) polysulfide The invention further relates to tires containing at least one component comprised of such rubber composition such as for example a tire tread

Patent
14 Dec 2018
TL;DR: In this article, the amino modified precipitated silica is prepared by carrying out co-precipitation on a silicon source and an amino modifier under alkaline conditions, and the performance of the precipitated material is improved and the application of the material is broadened.
Abstract: The invention belongs to the field of novel materials and relates to a preparation method of amino modified precipitated silica. According to the method, the amino modified precipitated silica is prepared by carrying out co-precipitation on a silicon source and an amino modifier under alkaline conditions; the performance of the precipitated silica is improved and the application of the precipitated silica is broadened. By using amino functionalization to change the surface chemical structure of the precipitated silica, the bonding performance of the precipitated silica and rubber can be improved; meanwhile, the application field of the precipitated silica is broadened, and the precipitated silica can be used for absorbing carbon dioxide, formaldehyde and heavy metal ions with the help of the function of amino groups.

Patent
14 Dec 2018
TL;DR: In this paper, a method of modified precipitated silica is presented. But the method is not suitable for the preparation of synthetic materials, as it requires the removal of the silica from the seed liquid and the addition of a silicon source.
Abstract: The invention discloses a preparation method of modified precipitated silica. The preparation method comprises the steps as follows: (1) preparing a seed liquid: adding sulfuric acid to a sodium silicate liquid in a stirring state until the pH of the liquid is 6-7 to obtain the seed liquid; (2) preparing a silicon source: adding oleic acid to the sodium silicate liquid, and uniformly mixing the mixture to obtain the silicon source; (3) adding sulfuric acid and the silicon source in the step (2) to the seed liquid in the step (1) in the stirring state, controlling the pH of the system to be 4-6during addition, and after addition, performing aging and filtration to obtain silica. Compared with an existing preparation method of modified silica, the method has the advantages that in-situ modification can be performed during preparation of the precipitated silica, the technological procedure is simpler, the production cost is reduced, the prepared silica is well compatible with organic phases, and the dispersity of the silica in rubber can be improved.

Patent
23 Feb 2018
TL;DR: In this paper, a production method of an inorganic powder material and in particular of alkaline silica is described, where the pH value ranges from 7.5 to 11 and the specific surface area ranges from 50m/gto 110m /g, so that an application of the product to special rubber is guaranteed.
Abstract: The invention relates to a production method of an inorganic powder material and in particular relates to a production method of alkaline silica. The production method comprises the following operation steps: (1) refining a water glass solution; (2) carrying out a synthetic reaction on precipitated silica; (3) carrying out filter pressing and washing on reaction slurry; (4) slurrying: conveying afilter cake to a beating tank by a belt conveyer, and carrying out slurrying in two stirring modes including a high-speed stirring mode and low-speed stirring mode to provide uniform slurry for spraydrying; and (5) drying process: after drying the slurry by a spray drying tower, carrying out pulverization by using a mechanical pulverizer until the particle size is smaller than 15mu m, and carrying out packaging and storage after carrying out collection by using a bag pulse deduster. By improving a traditional precipitation production process of silica and adopting a way of optimizing processparameters and optimally selecting an adjuvant in the production process disclosed by the invention, the pH value of a product ranges from 7.5 to 11, and the specific surface area ranges from 50m /gto 110m /g, so that an application of the product to special rubber is guaranteed.

Book ChapterDOI
01 Jan 2018
TL;DR: In this paper, the effects of coating using precipitated silica mixed with colloidal silica on the ink-jet printability of the rich mineral paper were investigated as the physical properties and printing performance were taken into comprehensive consideration.
Abstract: Rich mineral paper has been applied in many fields. The effects of coating using precipitated silica mixed with colloidal silica on the ink-jet printability of the rich mineral paper were investigated as the physical properties and printing performance were taken into comprehensive consideration. The results showed that precipitated silica had better adsorption of ink than colloidal silica and the two composites were better than the single one. When the ratio of pigment to glue was 100:20, precipitated silica was 70 parts, colloidal silica was 30 parts, PVA-1799 was 10 parts, latex was 10 parts and the coating weight was 8 g/m2. The color density C, M, Y, K of formula 2 was increased by 83.8, 66.2, 51.9 and 73.7% respectively and the smoothness was improved by 100% compared to the base paper. The smoothness of formula 2 was improved by 232% and color density C, M, Y, K was increased by 44.3, 0.9, 51.9 and 23.4% respectively compared to the color ink-jet paper with base weight of 128 g/m2.

Patent
10 May 2018
TL;DR: In this paper, a soil injection material consisting of a silica colloid-based grout capable of being stably manufactured even when sea water is used as a milling water or monovalent metal salt or polyvalent metal metal salt is contained, and a soil improvement method using the soil injection materials is provided.
Abstract: PROBLEM TO BE SOLVED: To provide a soil injection material consisting of a silica colloid-based grout capable of being stably manufactured even when sea water is used as a milling water or monovalent metal salt or polyvalent metal salt is contained, and a soil improvement method using the soil injection materialSOLUTION: There is provided a soil injection material containing salt precipitated silica obtained from water glass and salt There is provided a soil improvement method by injecting the soil injection material to soilSELECTED DRAWING: None

Patent
28 Dec 2018
TL;DR: In this paper, the ultralow hardness double-component addition type liquid silicon rubber which comprises a component A and a component B in a mass ratio of 1:1, wherein the component A comprisesthe following components in parts by mass: 60-80 parts of vinyl polysiloxane, 10-20 parts of precipitated silica, 01-08 part of a platinum catalyst and 5-10 parts of methylpolysilicone; the component B comprises the following components, in part by mass, namely,
Abstract: The invention discloses ultralow hardness double-component addition type liquid silicon rubber which comprises a component A and a component B in a mass ratio of 1:1, wherein the component A comprisesthe following components in parts by mass: 60-80 parts of vinyl polysiloxane, 10-20 parts of precipitated silica, 01-08 part of a platinum catalyst and 5-10 parts of methylpolysilicone; the component B comprises the following components in parts by mass: 60-80 parts of vinyl polysiloxane, 10-20 parts of precipitated silica, 01-1 part of side-low hydrogen-containing polysiloxane, 05-1 part ofend-low hydrogen-containing polysiloxane, 005-05 part of an inhibitor and 5-10 parts of methylpolysilicone The rubber has the advantages of being high in elongation rate, good in flowability, easyto separate from metals, easy to process and convenient to use

Patent
31 Jul 2018
TL;DR: In this article, an elastomer composition comprising silica and a sulfur-containing aromatic polymer is described, which has improved handling and ease of manufacture, and also relates to a process for the preparation of elastic composition and an article comprising the same.
Abstract: The present invention relates to an elastomer composition comprising silica and a sulfur-containing aromatic polymer which has improved handling and ease of manufacture. The invention also relates to a process for the preparation of elastomer composition and to an article comprising the same.

Patent
09 Aug 2018
TL;DR: In this article, a filter bed for removing dissolved organic compounds from a water-based liquid, comprising at least one filter unit in the form of a container in which an inlet (14, 22, 23) and an outlet (16, 17, 24) is provided, is arranged in the at least container between the inlet and the outlet.
Abstract: A filter apparatus (11) for removing dissolved organic compounds from a water based liquid, comprising at least one filter unit (12, 20) in the form of a container (13, 21) in which an inlet (14, 22, 23) and an outlet (16, 17, 24) is provided, a filter bed (25) being arranged in the at least one container between the inlet and the outlet, the filter bed comprising at least one layer of an adsorbent comprising an amorphous precipitated silica material, wherein the amorphous precipitated silica material has a porosity with an average pore width of less than 10 nm.

Patent
28 Sep 2018
TL;DR: In this article, an LED lamp bead base is described, which is composed of modified acrylic resin, xylene, boron nitride, sodium fluorosilicate, silicon powder, ammonium sulfate, zinc oxide, ammonium chloride, silicon dioxide, ferrous sulfate and titanium dioxide.
Abstract: The invention discloses an LED lamp bead base. The LED lamp bead base is composed of modified acrylic resin, xylene, boron nitride, sodium fluorosilicate, silicon powder, ammonium sulfate, zinc oxide,ammonium chloride, silicon dioxide, ferrous sulfate, titanium dioxide, fumed silica, precipitated silica, phenolic resin, polyester resin, silicone oil and aluminum nitride. Compared with the prior art, the lamp holder material prepared from components provided by the invention is used for mounting LED lamp beads, has good heat-conducting effect, improves heat-dissipating performance of a LED lamp, improves the service life of the LED lamp beads at the same time, and has popularization and application values.