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Study of the Heat-Resistance Property of the Polyurethan Elastomer

Author: ZhengHeng
Tutor: ShaoQian
School: Shandong University of Science and Technology
Course: Chemical processes
Keywords: Polyurethane elastomer Heat resistance Polyester Polyether
CLC: TQ334.1
Type: Master's thesis
Year: 2008
Downloads: 141
Quote: 0
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Abstract


The polyurethane elastomer, also known as poly urethane elastomer, polymer composite materials contain more carbamate groups on a main chain. Its elongation, and a wide range of hardness, especially abrasion resistance, biocompatibility and hemocompatibility. At the same time, it also has excellent oil resistance, impact resistance, low temperature resistance, radiation and load, insulation, insulation performance. It is between the resilient material between the general rubber and plastic, both having a high elasticity of the rubber, but also has a high-strength plastic. The polyurethane elastomer broad range of applications, has become a valuable material indispensable to the national economy and people's lives. Prepolymer method of the subject through the single factor experiment to determine the synthesis conditions of the polyurethane elastomer, and a high performance polytetrahydrofuran glycol prepared casting polyurethane elastomer, synthetic Elastomers excellent transparency better. Modification to improve the heat resistance of the polyurethane elastomer. And polyurethane elastomer heat resistance mechanism to do a preliminary exploration. The the polyurethane elastomer synthesis conditions are as follows: the ratio of raw material quality: polyester polyol: TDI: MOCA = 8:2:1; polyether polyol: TDI: MOCA = 10:2:1 initial reaction temperature: 60 ° C in rapidly stirred into the bubble as far as possible the situation; natural warming to 80 ℃ reaction was incubated for about 2 hours. Best chain extender is MOCA, joined MOCA then with a glass rod was stirred for about 2-3min, casting in a mold preheated to 100 ℃. Cured at room temperature, placed in an oven of 120 ℃ vulcanized 4 hours. Tuomo derived polyurethane elastomer products. The heat resistance of the elastic body is increased with increasing the content of NCO%, heat resistance, and when the NCO% to about 5% to achieve the best downward trend in the future. MOCA added amount of the heat resistance of the polyurethane elastomer has a similar trend, when added in an amount of TDI quality 1/2 hours, the heat resistance optimum. The mass fraction of the prepolymer-NCO groups directly affect the mechanical properties of the elastomer. Elastomer hardness, tensile strength and tear strength are basically increase with the increase in the mass fraction of the-NCO groups, while the ultimate elongation rate decreased. Generally, the water resistance of the polyester type polyurethane elastomer and good oil resistance; polyether type polyurethane elastomer better water resistance, oil resistance weaker than that of polyester-based elastomer. Superior heat resistance of the polyester type polyurethane elastomer a polyether type polyurethane elastomer. Modified polyester-type polyurethane elastomers have significantly improved heat resistance, the initial decomposition temperature can be increased from about 60 ° C to -80 ° C the maximum endothermic decomposition temperature was increased to about 33 ° C to -117 °. Modified polyether type polyurethane elastomer initial decomposition temperature can be increased to about 22 ° C to -44 ° C, the maximum endothermic decomposition temperature is raised to 22 ° C -30 ° C.

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CLC: > Industrial Technology > Chemical Industry > Rubber Industry > Thermoplastic elastomers > Polyester elastomer
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