Showing papers on "Magnesium peroxide published in 2002"

Oral hygiene powder composition and method

Abstract: A anhydrous tooth and gum powdered dentifrice formulated of calcium or magnesium peroxide, sodium bicarbonate, methylsufonymethane, ascorbic acid, colostrum, and optionally menthol, flavoring agent, sweetening agent, sodium laurel sulfate and green tea extract that has a long shelf life but when activated by water or saliva, functions to effect a synergistic chemical and mechanical action to whiten, brighten, polish teeth and reduce bacteria so as to aid in the prevention and treatment of periodontal disease, dental caries and mouth odor.

X-ray photoelectron spectroscopy characterization and morphology of MgO thin films grown on single-crystalline diamond (100)

Abstract: The morphology and composition of MgO films grown on single-crystalline diamond (100) have been studied. MgO thin films were deposited in the substrate temperature range from room temperature (RT) to 723 K by means of electron beam evaporation using a MgO powder source. Atomic force microscopy images indicated that the film grown at RT without O2 supply was relatively uniform and flat whereas that deposited in oxygen ambient yielded higher growth rates and rough surface morphologies. X-ray photoelectron spectroscopy analyses demonstrate that the MgO film deposited at RT without O2 has the composition closest to that of the stoichiometric MgO and that a thin contaminant layer composed mainly of magnesium peroxide (before etching) or hydroxide (after etching) was unintentionally formed on the film surface, respectively.These results will be discussed in relation to the interaction among the evaporated species and intentionally supplied oxygen molecules at the growth front as well as the interfacial energy between diamond and MgO.

Improved internal breaker

Abstract: A wellbore fluid including a peroxide degradable polymer and an encapsulated peroxide source. The peroxide degradable polymer may be a polysaccharide. The peroxide source may include an inorganic peroxide, including zinc and alkaline earth metal peroxides, such as magnesium peroxide. The encapsulating material may be a polymer, including enteric polymers. The release of peroxide, from peroxide sources generally, can be controlled by means of pH such that peroxide source can be activated, and peroxide released, by a change in pH. In a wellbore, this pH change can be effected by using produced fluids to lower the pH of a more basic wellbore fluid.

Prepn of magnesium peroxide

Abstract: The present invention relates to an improved preparation process of magnesium peroxide. The process is characterized by that dilute hydrogen peroxide solution, magnesia, powder as raw material and organic phosphonic acid and its salt as stabilizer are added to produce wet magnesium peroxide, which is dried to obtain white magnesium peroxide powder. The added amount of phosphonic acid and its saltby weight of P2O5 is 0.01-1.5 wt% of magnesia. By the process stability of magnesium peroxide is raised during reaction to produce magnesium peroxide product with magnesium peroxide content over 30%.In addition, the process is simple, low in power consumption and high in yield and is suitable for large scale production.

Regeneration method for waste butylchloride rubber

Abstract: The regeneration method of waste chlorinated butyl rubber includes five procedures of classification, coarse selection and crushing; primary regeneration softening, refining desulfurizing regeneration softening, curing rubber-filtering and refining. It is characterized by that in both softening procedures it respectively adopts (wt%) 1-2% of pentachlorothiophenol or ditolyl-thiophenol, 0.7-1% of diethyl dithiocarbamic acid, 3% of petroleum resin and 0.3-0.5% of dicumin peroxide, 1-2% of magnesium peroxide or zinc peroxide or cadmium peroxide, 5-8% of chain hydrocarbon oil or alkane oil and 2%of petroleum resin as regeneration agent and softening agent. Said invention is simple in technological process and high in product quality.

Powdery mixture and preparing method and use thereof

Abstract: PCT No. PCT/BE95/00012 Sec. 371 Date Sep. 10, 1996 Sec. 102(e) Date Sep. 10, 1996 PCT Filed Feb. 10, 1995 PCT Pub. No. WO95/26324 PCT Pub. Date Oct. 5, 1995A powdered mixture of chemicals for forming a refractory composition, including a filler consisting of refractory particles, metal particles and metal peroxide containing particles, wherein the metal peroxide containing particles have a calcium peroxide content of at most 75 wt %, a magnesium peroxide content of at most 30 wt %, a barium peroxide content of at most 92 wt %, and/or a strontium peroxide content of at most 90 wt %. A refractory composition prepared from said mixture, a method for forming said composition and a method for using same are also disclosed.

Metal peroxide composition for removal and prevention of green tide

Abstract: PURPOSE: A metal peroxide composition for preventing and eliminating the proliferation of Cyanophyceae by precipitation of essential nutrients of Cyanophyceae as the principal cause of chlorophyceae to metal peroxide is provided which accelerates self-purification action of fresh water by increasing the amount of dissolved oxygen in fresh water as well as eliminating Cyanophyceae. CONSTITUTION: The composition contains 80 to 95 parts by weight of alkali metal peroxide as metal peroxide, which metal peroxide is one or more selected from the group consisting of calcium peroxide, magnesium peroxide and sodium peroxide, 5 to 10 parts by weight of urea peroxide or 5 to 15 parts by weight of sodium silicate. The composition is poured into fresh water in an amount of 100 to 1,000ppm to eliminate phosphates from fresh water.