Method for producing polyacetal copolymer
A technology of polyacetal copolymer and manufacturing method, which is applied in the field of polyacetal copolymer manufacturing, can solve the problems of reduced polymerization yield, fouling of polymerization reactors hindering long-term stable operation, etc., and achieve the effect of maintaining polymerization yield
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Embodiment 1
[0110] A twin-shaft paddle-type continuous polymerization reactor (manufactured by Kurimoto Iron Works, Ltd., diameter 2B, L / D=14.8) equipped with a jacket through which a heat medium can flow was adjusted to 80°C.
[0111] Boron trifluoride n-butyl ether complex as a polymerization catalyst was used at 0.18 g / hour, cyclohexane with a ring structure as an organic solvent was used at 6.2 g / hour, and n-hexane with a linear structure as an organic solvent The premixed solution obtained by continuously mixing alkanes at 0.3 g / hour at a temperature of 28°C, and methylal as a low-molecular-weight acetal compound at 2.4 g / hour as cyclic ethers and / or cyclic formals The mixed solution obtained by continuously mixing 1,3-dioxolane at 120.9 g / hour and trioxane at 3500 g / hour is continuously supplied to the polymerization reactor through respective pipes to perform polymerization , thus obtaining a crude polyacetal copolymer.
[0112] The crude polyacetal copolymer discharged from the p...
Embodiment 2～5
[0117] The amount of the organic solvent and the ratio of the compound having a cyclic structure and the compound having a linear structure in the organic solvent were changed to the amounts shown in Table 1 below.
[0118] Other conditions were set to be the same as the above [Example 1], and a polyacetal copolymer was obtained.
[0119] The evaluation results are shown in Table 1 below.
Embodiment 6
[0121] A twin-shaft paddle-type continuous polymerization reactor (manufactured by Kurimoto Iron Works, Ltd., diameter 2B, L / D=14.8) equipped with a jacket through which a heat medium can flow was adjusted to 80°C.
[0122] First, 0.18 g / hour of boron trifluoride n-butyl ether complex as a polymerization catalyst, 6.2 g / hour of cyclohexane as an organic solvent, and 0.3 g / hour of n-hexane were continuously to mix. Next, 1,3-dioxolane as a cyclic ether and / or cyclic formal was continuously premixed at 120.9 g / hour at a temperature of 25°C and a mixing time of 2 minutes to obtain a premixed Mixture.
[0123] A static mixer was used in the premixing.
[0124] 127.58 g / hour of the premixed solution was continuously mixed with methylal, which is a low molecular weight acetal compound, into trioxane supplied at 3500 g / hour through a pipeline at 2.4 g / hour. The mixed solution was continuously supplied to the polymerization reactor through the respective pipes and polymerized to ob...
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