Polyformaldehyde resin made twisting yarn
A polyoxymethylene resin and twisted yarn technology, applied in the twisted yarn field, can solve the problems of lack of stability such as long-term heat resistance stability, inability to obtain durability, poor productivity, etc., and achieve high strength, high elasticity, Excellent high temperature rigidity
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[0026] A continuous mixing reactor consisting of a jacket with a circulating hot (cold) medium on the outside, a cylinder whose cross-section is the overlapping shape of two circles, and a rotating shaft with paddles is used, and two rotating shafts with paddles are used The shafts are rotated at 150rpm, while liquid trioxane, cyclic ether or cyclic formal (1,3-dioxolane, 1,4-butanediol formal, diethylene glycol formal, etc. formaldehyde), further supply molecular weight modifier methylal continuously in polymerizer, supply 50ppm catalyst boron trifluoride (relative to monomer total amount) simultaneously, carry out bulk polymerization, prepare the polymkeric substance of comonomer amount shown in table 1 . The reaction product discharged from the polymerizer was quickly introduced into a pulverizer, and a 60° C. aqueous solution containing 0.05% by weight of triethylamine was added to deactivate the catalyst. After further separation, washing and drying, the crude polyoxymet...
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