49 results about "Middle molecular weight" patented technology

The invention relates to a kind of insitu filling polymerization-manufacturing method of inorganic whisker intensification polyolefin composite material. Load olefinic polymerization catalyst in the surface of inorganic whisker with preliminary stirring-dispersing treatment, and then take alkene monomer polymerization in its surface in order to get polyolefin / whisker composite material. The composite material is composed with 3-80% inorganic mineral whisker and 20-97% polyolefin polymer. The manufacturing method in the invention is convenient. The composite material manufactured by the method has high filling extent of whisker, retentive slenderness ratio of whisker, and also the whisker has well distribution in matrix polymer and fine adhesion with matrix interface, so that it can give full play to intensification characteristic of whisker, in order to get polyolefin / inorganic whisker composite material with the advantages such as easiness to formation and processing, fine cleanliness of product, and excellent mechanical property. Plastics matrix can be manufactured into polyolefin from low molecular weight, middle molecular weight, and high molecular weight to superhigh molecular weight, such as polypropylene or polythene. The material acquired can be used not only as structural material by direct injection formation, but also as masterbatch after having crossblend with commercial polyolefine.

The invention discloses a high and low temperature type anti-corrosion viscoelastic body filler. The high and low temperature type anti-corrosion viscoelastic body filler is characterized by comprising a protective film, a viscoelastic body paste layer and an isolation film. The protective film is a polyethylene film; the isolation film is a polyester isolation film; and the viscoelastic body paste layer is composed of the following raw materials by mass: 33-36% of middle molecular weight polyisobutylene, 10.5-12.5% of low molecular weight polyisobutylene, 50-55% of precipitated barium sulphate, 1-1.5% of an antioxidant and 0.5-0.6% of phthalocyanine green. A preparation method of the high and low temperature type anti-corrosion viscoelastic body filler comprises the steps of kneading the raw materials to obtain daub; sending the daub into a reaction kettle for mixing; extruding by an extruder; coating on the isolation film; plying up the protective film; and rolling by a double-roller machine to obtain a product. The high and low temperature type anti-corrosion viscoelastic body filler is not restricted by the high and low temperatures, has self-repairing functions, is used as a sealing and filling anti-corrosion material for special-shaped pipes such as special-shaped steel elbows, bends, three-way gate valves and flanges, is environment-friendly and convenient for use, and has a good filling and sealing effect.

Permselective asymmetric membranes suitable e.g. for hemodialysis, hemodiafiltration and hemofiltration of blood, and having improved sieving characteristics providing enhanced removal of middle molecular weight substances, e.g. inflammatory mediators having a molecular weight between 20 and 40 kDa. The membranes comprise polyethersulfone and polyvinylpyrrolidone and are coated with hyaluronic acid or copolymers of 2-methacryloyloxyethyl phosphoryl choline and other vinyl polymerizable monomers. Processes for the preparation of these membranes, devices comprising these membranes, and the use of these membranes in hemodialysis, hemodiafiltration and hemofiltration of blood, as well as in bioprocessing, plasma fractionation and the preparation of protein solutions.

The present invention discloses a method for preparing carbon-fibre reinforced polylactic acid / hydroxyapatite composite material. It is made up by using (by wt%) 75-85% of lactide, 22-14% of hydroxyapatite and 1-3% of carbon fibre as raw material, using stannous octoate as catalyst through a certain preparation process.