Method for producing a polyacetal copolymer
The technology of a polyacetal copolymer and a manufacturing method is applied in the manufacturing field of the polyacetal copolymer, which can solve the problems of reduced polymerization yield, fouling of a polymerization reactor and hinder long-term stable operation, and achieves the effect of maintaining the 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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