33results about How to "Excellent repeatability" patented technology

The invention provides a thermoplastic composite elastomer material and a preparation method thereof. The thermoplastic composite elastomer material comprises polyamide / acrylate rubber dynamic vulcanizate and thermoplastic polyurethane elastomer in a weight ratio of (3-9):( 1~7) the composite elastomer material obtained by blending in the ratio; the overall performance of the thermoplastic composite elastomer material obtained by the present invention has significantly improved compared with the two materials before blending, especially low temperature elastic performance, low temperature Tensile strength and low-temperature brittleness, the low-temperature tensile strength can reach 26MPa at ‑35°C, the elongation can reach 402%, and the low-temperature brittleness temperature can be as low as ‑45°C. The material also has excellent water resistance, Long-term high-temperature service performance, high-temperature oil resistance, high elasticity and good repeated processing performance, the use of it to prepare materials such as wires and cables, seals, rubber hoses can fill the technical gap in the application of the above materials in high-end technical fields in my country.

The invention provides thermally reversible crosslinked polyurethane containing dicyclopentadiene crosslinking bridged bonds, and a preparation method and applications thereof. Dicyclopentadiene dicarboxylic acid and polyisocyanate (I) carry out reactions to generate a terminal isocyanate component, which contains a dicyclopentadiene structure and is taken as a crosslinking agent, and the terminalisocyanate component and a terminal hydroxyl component carry out reactions to form a crosslinked polyurethane network. By introducing dicyclopentadiene bridged bonds into polyurethane, at a high temperature, bridged bonds are broken; at a low temperature, bridged bonds are formed again; and repeated processing of chemical crosslinking type polyurethane is realized. The primary reverse Diels-Alderreaction temperature of dicyclopentadiene bridged bonds is 170 DEG C; and dicyclopentadiene bridged bonds are introduced into polyurethane to realized thermoplastic processing of crosslinking type polyurethane in a temperature range of 170 to 210 DEG C. The prepared thermally reversible polyurethane has an excellent repeated processing property, and still has good mechanical properties after manytimes of processing and moulding.