The invention relates to a method for preparing modified nano montmorillonite, characterized by using an intercalation/coupling secondary modification technique, using an acid composite intercalation solution as a dispersing agent, dispersing montmorillonite through using the salvation of the intercalating agent solution, then adding a certain amount of a titanate coupling agent dropwisely in the montmorillonite for surface modification, then modifying the montmorillonite by secondary intercalation through using acrylate monomers, and further dispersing the nano montmorillonite through initiating the polymerization of the acrylate monomers between the montmorillonite layers to obtain the modified nano montmorillonite finally The modified nano montmorillonite can effectively increase the thermal stability of polrvinyl chloride (PVC)

Method for preparing modified nano montmorillonite

A supported PVC (polyvinyl chloride) heat stabilizer is characterized in that the stabilizer takes activated clay as a supporter, an active component, namely, calcium hydroxide, is supported in the supporter, the surface is modified by fatty acid which is good in affinity with PVC, and a specific implementation method is as follows: the activated clay is stirred to be dispersed in water, then a calcium hydroxide emulsion is added for supporting, the fatty acid is added for modifying after supporting, and finally, the PVC heat stabilizer is obtained after filtration, drying and crushing. The stabilizer cannot release salt or organic matters to pollute the PVC after adsorbing hydrogenchloride and is non-toxic, odorless, safe, environment-friendly and easy to prepare, and raw materials are easy to obtain.

Supported PVC (polyvinyl chloride) heat stabilizer and preparation method thereof

The invention discloses a multi-layer composite modified nylon gear/wheel and a manufacture method thereof, which belong to the field of transmission. The multi-layer composite modified nylon gear/wheel comprises a bearing layer, a main layer is arranged outside the bearing layer, and a wear-resistant layer is arranged outside the main layer. In the invention, the multi-layer composite modified nylon gear/wheel sufficiently utilizes the physical properties of various modified nylons, contains three modified nylons having different physical properties and comprises three layers which are respectively: 1, an outermost layer, namely, the wear-resistant layer which is made of crystal whisker enhanced nylons; 2, a middle layer, namely the main layer which is made of glass fiber enhanced nylons; and 3, an innermost layer, namely the bearing layer which is made of heat resistant and thermostable enhanced nylons. The three layers are respectively cast from the inner side to the outer side, and the gear/wheel which is needed to be molded is finally obtained through machining. The obtained gear/wheel can bear high load and high rotating speed and does not require heat processing.

Multi-layer composite modified nylon gear/wheel and manufacture method thereof

The invention relates to a dispersing agent for chemical fiber paper and a method for preparing the chemical fiber paper by applying the dispersing agent, and belongs to the technical field of the dispersing agents. The dispersing agent for the chemical fiber paper comprises a component A and a component B, wherein the component A comprises an organic solvent; and the component B comprises a water-soluble macromolecular polymer, an antistatic agent, a penetrating and softening agent, a surfactant and a defoaming agent. Chemical chopped fiber is cleaned with the component A, the surface of the fiber is washed with water and the fiber is dried completely; and each component is dissolved by adding water and then is stirred uniformly to obtain the component B, the chopped fiber and the component B are mixed, and the mixture is pre-soaked under the mechanical stirring condition. If pulping is required, water is supplemented according to the set pulping concentration and pulping is conducted. The dispersing agent is added in the papermaking process of the chemical chopped fiber, so that dispersion of the chemical chopped fiber in water can be improved quickly, effectively and durably, the uniformity and the performance of the material are improved, the pulping time and the pulping energy consumption can be reduced, the operation of a pulping machine is improved, and the problems that the fiber is cut off, the fiber performance is damaged, the foam amount is large, the fine fiber content is high and the like caused by long-time pulping are solved.

Dispersing agent for chemical fiber paper and method for preparing chemical fiber paper by applying dispersing agent

The invention discloses a whitewater for producing a glass fiber wet-process felt and a preparation method thereof. The whitewater contains water and the following components by weight percent: 0.4-1.0% of thickening agent and 0.01-0.02% of dispersing agent, wherein hydroxyethyl cellulose, methylcellulose or hydroxypropyl methyl cellulose is taken as the thickening agent, and fatty acid polyethylene glycol ester is taken as the dispersing agent. The invention also discloses the preparation method for the whitewater, which comprises the following steps: A) adding de-ionized water into a thinning tank; B) slowly adding the thickening agent into the thinning tank under a stirring condition, and continuing stirring till the solution is transparent, wherein air bubble is forbidden to enter into the solution during the stirring process; C) adding the dispersing agent into the thinning tank under the stirring condition, and continuing stirring. The whitewater for producing the glass fiber wet-process felt, provided by the invention has strong dispersing capacity and good dispersing effect. Especially, the whitewater can better disperse various short shreds and can increase the efficiency of producing the glass fiber wet-process felt.

Whitewater for producing glass fiber wet-process felt and preparation method thereof

The invention relates to a PVC montmorillonite/rare-earth stabilizing agent and a preparation method thereof, wherein, weight part components of the stabilizing agent comprise 100 of montmorillonite, 1 to 40 of organic rare-earth salts, 200 to 500 of dispersive medium, 1 to 10 of surface modifying agent, and 10 to 50 of auxiliary stabilizing agent. The organic rare-earth salts are prepared by organification of lanthanides inorganic rare-earth salt and long chain fatty acid. The long chain fatty acid is epoxy oleic acid, stearic acid, lauric acid or citric acid, taking up 5 percent to 40 percent of gross mass of the organic rare-earth salt. The long chain fatty acid takes up 20 percent to 40 percent of gross mass of the organic rare-earth salt. The invention overcomes defects of soft quality of traditional stabilizing agent and weak absorption ability of ultraviolet radiation and is provided with fine stripping performance and high reinforcing ability, and can effectively improve anti-attacking performance of PVC compound materials, realizes fine annealing strengthening and strengthening effects of nanometer padding and is provided fine barrier function to ultraviolet irradiation. The invention is suitable to PVC materials requiring high material mechanical strength.

Montmorillonite/rare-earth stabilizer for PVC and preparation method thereof

The invention relates to a nylon master batch composition for preparing a gear by a mould method, which comprises the following components by weight portion: 50 to 65 portions of high molecular plastic nylon, 30 to 40 portions of cluster chopped glass fiber, 5 to 10 portions of micro-sized organic montmorillonite, and 5 to 10 portions of micro-sized glass micro powder. The high molecular plastic nylon comprises high molecular nylon-6 or nylon-66. The cluster chopped glass fiber has 50 to 100 strips per cluster and is subjected to surface treatment by silane coupling agent, the diameter of each glass fiber is 6 to 11 microns, and the length is 6 millimeters. The particle diameter of the organic montmorillonite is 1 to 5 microns, and the montmorillonite is subjected to organized treatment. The diameter of the glass micro powder is 7 to 14 microns, the ratio of the length to the diameter is between 1 to 5 and 1 to 10, and the glass micro powder is subjected to surface treatment by the silane coupling agent. The invention has the advantages of simple process, easy operation, heat resistance, abrasion resistance, lubricity, and good weather resisting property and deformation resistance, and can improve dimensional stability of glass fiber modified nylon master batch.

Nylon masterbatch composition for preparing gear by mould method

The invention relates to a mica/rare-earth salt stabilizing agent for PVC and a method for preparing the same The mica/rare-earth salt stabilizing agent comprises the following compositions by mass percentage: 50 to 80 percent of mica, 6 to 40 percent of long-chain fatty acid organified rare-earth salt and 4 to 25 percent of surfactant The organic rare-earth salt is obtained through the organification of lanthanide-system inorganic rare earth salt and long-chain fatty acid; and the long-chain fatty acid is selected from oleic acid, stearic acid, lauric acid and citric acid Mica has a laminated structure; the dispersion medium is water and ethanol; and the surfactant is pentaerythritol ester, triphenyl phosphate oxygen and acrylate The mica/rare-earth salt stabilizing agent has good ultraviolet absorption performance, strong capacity for ultraviolet absorption, obvious reinforcing effect, high thermal resistance, good dimension stability and chemical stability, high insulating resistance and large dielectric strength; the mica has good effect of flame retardance, can reduce the use amounts of alumina, aluminium hydroxide and other flame retardants, and improves the capacity forflame retardance of the PVC material

Mica/rare-earth salt stabilizer for PVC and preparation method thereof

Aqueous dispersion for environment-friendly type fiberglass surfacing mat

The invention relates to an oxidized graphite/rare-earth stabilizing agent used in PVC and a preparation method thereof; wherein the stabilizing agent comprises according to the parts by weight: 50-80 of oxidized graphite, 1-40 parts of organic rare-earth salts, 200-500 of dispersive medium, 1-20 of surface modification, and 10-50 of assistant stabilizing agent. The rare-earth salts are obtained by organizing lanthanide series inorganic rare-earth salts and long-chain fatty acids. The dispersive medium is water or ethanol. The surface modification is pentaerythritol ester, triple phenoxyl phosphorus or acrylic ester. The assistant stabilizing agent is dibenzoyl methane, stearic acid, polyethylene wax or compound thereof. The invention has super high thermal stability, good thermal conductivity and chemical durability and good interface adhesive property with resin, high self lubricity, good ultraviolet absorption performance, strong ultraviolet radiation absorption capabilitly and obvious reinforcement effect.

Zhenmao Ma

Papers

Montmorillonite/rare-earth stabilizer for PVC and preparation method thereof

Nylon masterbatch composition for preparing gear by mould method

Mica/rare-earth salt stabilizer for PVC and preparation method thereof

Aqueous dispersion for environment-friendly type fiberglass surfacing mat

Oxidized graphite / rare earth stabiliser for PVC and preparation thereof