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1. 发明授权

US3141865A Mixing process for producing polyurethane plastics 失效
标题翻译：用于生产聚氨酯塑料的混合工艺
公开(公告)号：US3141865A
公开(公告)日：1964-07-21
申请号：US66539857
申请日：1957-06-13
申请人： ALLIED CHEM
发明人： MCEVOY RICHARD T
IPC分类号： B29B7/40 , B29C44/34 , B29C44/36
CPC分类号： B29C44/36 , B29B7/408 , B29C44/3442
摘要： A mixing apparatus and process (see Division B1) may be used for the continuous preparation of low-density flexible polyurethane foams. In an example a polyisocyanate is added to a mixture of polyol, water, catalyst, emulsifier and colourant. The polyisocyanate was a mixture of m-tolylene diisocyanate containing 80% of the 2, 4 isomer and 20% of the 2, 6 isomer; the polyol was prepared by copolymerizing adipic acid with a glycol and a triol. The emulsifier was a polyethylene glycol ricinoleate; the catalyst, N-methyl morpholine, and the colourant a copper phthalocyanine filter cake. 2250 G/min of polyol premix and 900 G/min tolylene diisocyanate mixture were supplied to the mixer which was operated at 4,000 r.p.m. with residence time of 1 sec. The volume of the discharged reaction mixture increased 46-fold after 1 minute, and after curing provided a foam of density 1.6 lb./cu. ft. In another example the polyisocyanate and polyol components were pre-mixed and partially reacted to form a pre-polymer which was afterwards mixed with a catalyst mixture. The polyol was a mixture of adipic acid and diethylene glycol, and the polyisocyanate and catalyst were the same as in the first example. The pre-polymer was prepared by mixing 390 parts of tolylene diisocyanate mixture and 1,000 parts of the polyol and agitating for 30 minutes under an atmosphere of carbon dioxide. 2,840 G/min. of the pre-polymer and 200 G/min. of catalyst were supplied to the mixer under the same conditions as before. Volume expansion of the product was 35 fold and the cured foam has a density of 2.1 lb/cu. ft.

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