4results about How to "High tensile modulus" patented technology

The application relates to a multi-phase synergic high-strength high-elasticity polyester elastomer and a preparation method and application thereof, and belongs to the technical field of high polymer material synthesis. The application comprises the following steps: weighing binary acid I, binary alcohol and a hydroxyl-terminated polyether, and performing esterification reaction on terminal carboxyl groups and terminal hydroxyl groups to form an esterification product; polyester oligomers are prepared by performing ester exchange reaction between the terminal hydroxyl groups of the esterification product; caprolactam is added to generate aminocaproic acid by ring-opening reaction, and meanwhile, the aminocaproic acid and part of the polyester oligomers perform esterification reaction to form a multi-component oligomer with terminal amino groups and terminal hydroxyl groups; binary acid II and a solvent are added, and salt formation reaction is performed on the terminal carboxyl groups and the terminal amino groups at low temperature; at high temperature, three forms of polycondensation reactions, i.e., amide bond formation by dehydration of the ammonium salt, ester bond formation by dehydration of the terminal carboxyl groups and the terminal hydroxyl groups, and ester bond formation by dehydration of the binary alcohol between the terminal hydroxyl groups, are synchronously performed to prepare a multi-block polyester elastomer. The hydrogen bond interaction is strengthened, and the tensile strength, tensile modulus and elastic recovery capacity of the elastomer are improved.

The application discloses a polyurethane elastomer and a preparation method thereof. Raw materials of the polyurethane elastomer include polymer polyol, diisocyanate and chain extender, etc., wherein the polymer polyol is prepared by condensation reaction or ester exchange reaction of aromatic diacid, ester or anhydride thereof and raw materials such as polyether glycol, the polyurethane elastomer of the application has a molecular structure containing hard segments obtained by reaction of isocyanate and small-molecule polyol chain extender, and soft segments containing ester bond connected aromatic group-polyether glycol block copolymer structure, and can realize the following performances: keeping high mechanical properties (specifically represented by high elastic recovery rate, tensile modulus and breaking strength), and endowing the polyurethane elastomer with excellent hydrolysis resistance, oil resistance, wear resistance and low-temperature flexibility.

The present application aims to provide a sheet having high transparency, suppression of yellowing caused by heating, and high tensile elastic modulus, and also excellent softness, and a laminate having the sheet. The sheet of the present application contains microfine fibrous cellulose having a fiber width of 10 nm or less, and a cellulose derivative having a weight average molecular weight of 1.0 x 10 4 3.0 x 10 5 the following cellulose derivative.

The application discloses a kind of polypropylene composite material and preparation method and application thereof, belong to high polymer material technical field.Polypropylene composite material includes following component according to weight fraction: polypropylene resin 50~80 parts;Chopped carbon fiber 20~40 parts;Polar graft A 3~5 parts;Polar graft B 2~5 parts;Beta nucleating agent 0.05~0.3 parts;Antioxidant 0.2~2 parts;Wherein, the polar graft A is maleic anhydride graft, and the mass grafting rate of maleic anhydride is 0.7~1.3%;Polar graft B is glycidyl methacrylate graft, and the mass grafting rate of glycidyl methacrylate is 0.6-0.8%.The polypropylene composite material of the application can significantly improve the impact performance of the material under the premise of maintaining the mechanical properties of the material, so that the material has high tensile strength, high tensile modulus and high impact strength.