Low-density polyurethane gel composition
A technology of polyurethane gel and composition, applied in the field of low-density polyurethane gel composition, can solve the problems of low viscoelasticity, low viscosity coefficient, low specific gravity and the like of light wax oil, so as to overcome the problems of low viscoelasticity and high viscoelasticity , the effect of good sound permeability
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Embodiment 1
[0029] Get 100 parts of 2,4-toluene diisocyanate, 547 parts of polypropylene glycol with a molecular weight of 1000, 800 parts of 0# aviation kerosene, 170 parts of dibutyl phthalate, 5 parts of dibutyltin dilaurate, 1,6-hexa 5 parts of methylene bis(3,5-di-tert-butyl-4-hydroxyhydrocinnamate), mix the above components evenly, cast in the mold, solidify after 2 days, and reach the best strength after 14 days, the obtained The specific gravity of low-density polyurethane gel is 0.85g / cm 3 , the Shore A hardness is 5, the elongation at break is 80%, and in the range of -40°C to +50°C, tanδ>0.3.
Embodiment 2
[0031] Get carbodiimide modified liquefied MDI100 parts, molecular weight is 530 parts of polyoxypropylene trihydric alcohols of 3000, 1000 parts of 90# gasoline, 260 parts of light wax oils, 6 parts of phenylmercury acetates, two (2,2,6 , 6 parts of 6-tetramethyl-4-piperidinyl) sebacate, mix the above components evenly, cast in the mold, solidify after 2 days, and reach the best strength after 10 days. The specific gravity of the obtained low-density polyurethane gel is 0.80g / cm 3 , the Shore A hardness is 15, the elongation at break is 100%, and in the range of -40°C to +70°C, tanδ>0.5.
Embodiment 3
[0033] First take 1000 parts of carbodiimide-modified liquefied MDI, 257 parts of polyoxytetramethylene glycol with a molecular weight of 1000, and prepare a semi-prepolymer with an isocyanate content of 25%.
[0034] Get 100 parts of synthetic semi-prepolymers, molecular weight is 496 parts of polyoxybutylene glycols of 2000, 600 parts of 0# aviation kerosene, 295 parts of light wax oil, 5 parts of dibutyltin dilaurate, the above-mentioned components After mixing evenly, pour it into the mold, solidify after 2 days, and reach the best strength after 14 days, and the specific gravity of the obtained low-density polyurethane gel is 0.85g / cm 3 , the Shore A hardness is 10, the elongation at break is 90%, and in the range of -40°C to +60°C, tanδ>0.4.
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