Environmentally-friendly storage-stable polyurethane composition for reaction injection molding and preparation method thereof
A technology of injection molding and composition, which is applied in the field of polyurethane, can solve the problems that the molding cycle is less than 1 minute, and the tin catalyst is difficult to meet the environmental protection index, and achieve the effect of short curing and demoulding time, good compactness and good selectivity
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[0032] Examples The preparation method of the delayed amine catalyst is as follows: mix 1 part of triethylenediamine with 2 parts of ethylene glycol or diethylene glycol, heat to 70-80 ° C and stir to dissolve, then add 20% by mass of salicylic acid , After heating at 80°C and stirring for 1 h, the delayed catalyst was obtained.
[0033] The concrete process of embodiment composition A, B component preparing PU-RIM material by RIM machine is as follows:
[0034] ①Feeding: according to the formula, premix component A of the composition evenly and add it to the storage tank of component A of the high-pressure injection machine, and then weigh a certain amount of component B of the composition and add it to the storage tank of component B;
[0035] ②Injection: Set the material temperature of component A to 20-40°C, component B at 20-40°C, and the injection pressure at 15±3MPa. After starting the injection, inject the reaction material, which has been preheated to 50-50°C, through...
Embodiment 1
[0039] Component A: 330N: 79.6 parts; 1,4-butanediol: 13.4 parts; carbon black: 2 parts; 2-(2'-hydroxy-5'-methylphenyl) benzotriazole: 3.6 parts ; Parts of bis(3,5-di-tert-butyl-4-hydroxyphenyl)sulfide: 1.2 parts; Bismuth neodecanoate: 0.09 parts; Delayed amine catalyst: 0.1 parts. Add each component into the reaction vessel, stir evenly and then discharge.
[0040]Component B: carbodiimide-modified diphenylmethane diisocyanate (NCO mass fraction 29%-30%): 90 parts; polyoxypropylene diol with a molecular weight of 2000: 10 parts. NCO mass fraction is 26.2%.
[0041] The reaction ratio of A and B is 100:58.5.
Embodiment 2
[0051] Component A: 330N: 77.35 parts; Ethylene glycol: 20.5 parts; Carbon black: 2 parts; Bismuth neodecanoate: 0.06 parts; Delayed amine catalyst: 0.08 parts. Add each component into the reaction vessel, stir evenly and then discharge.
[0052] Component B: uretonimine modified diphenylmethane diisocyanate (NCO mass fraction: 29-30%): 90 parts; polyoxypropylene diol with a molecular weight of 2000: 10 parts. NCO mass fraction is 26.4%.
[0053] A, B reaction ratio is 100:120.
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