Manufacturing method of 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 supply, reduction of polymerization yield, and inability to stabilize raw materials, etc., so as to reduce fouling and maintain polymerization yield Effect

Active Publication Date: 2015-04-29
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] On the other hand, as mentioned above, in order to stabilize the quality of parts using polyacetal copolymers, it is important to run stably for a long time during the polymerization of polyacetal copolymers. The reasons for the long-term stable operation during polymerization include, firstly, the fouling in the supply part of the polymerizer, which prevents stable supply of raw materials and lowers the polymerization yield.

Method used

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  • Manufacturing method of polyacetal copolymer
  • Manufacturing method of polyacetal copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0145] A biaxial paddle type continuous polymerization reactor (manufactured by Kurimoto Iron Works Co., Ltd., diameter 2B (2 inches), L (distance from the raw material supply port to the discharge port of the polymerization reactor) / D (the inner diameter of the polymerization reactor) = 14.8) was adjusted to 80°C.

[0146] Cyclohexane as an organic solvent (boiling point: 80.74° C.) and IRGANOX 1010 as an antioxidant were prepared as an organic solvent mixed solution (I) with a mass ratio of organic solvent:antioxidant=540:1.

[0147] Next, 0.18 g / hour of boron trifluoride-di-n-butyl ether complex as a polymerization catalyst, 0.24 g / hour of formal as a low molecular weight acetal, and 6.50 g of the above-mentioned organic solvent mixture (I) / hour and 1,3-dioxolane as a cyclic ether and / or cyclic formal are continuously premixed at 120.9g / hour at a temperature of 30°C and a mixing time of 2 minutes to obtain a premixed Mixture.

[0148] In addition, a static mixer was use...

Embodiment 2～5

[0155] The composition of the raw materials and the preparation conditions of the premix solution were changed as shown in Table 1 below.

[0156] Other conditions were the same as in Example 1 to obtain a polyacetal copolymer.

[0157] The evaluation results are shown in Table 1 below.

Embodiment 6

[0159] A twin-shaft paddle type continuous polymerization reactor (manufactured by Kurimoto Iron Works, diameter 2B, L / D=14.8) equipped with a jacket through which a heat medium can flow was adjusted to 80°C.

[0160] Boron trifluoride-di-n-butyl ether complex as a polymerization catalyst, cyclohexane as an organic solvent and IRGANOX1010 as an antioxidant were prepared as polymerization catalyst in mass ratio: organic solvent: antioxidant=15:300: 1 organic solvent mixed solution (II).

[0161] Next, 0.24 g / hour of formal as a low molecular weight acetal, 3.79 g / hour of the above-mentioned organic solvent mixture (II), 1,3-dioxa as cyclic ether and / or cyclic formal Cyclopentane was continuously premixed at 120.9 g / hour at a temperature of 30° C. and a mixing time of 2 minutes to obtain a premix liquid.

[0162] In addition, a static mixer was used in the preparation of the above-mentioned premix liquid.

[0163] The above-mentioned premixed solution was continuously supplied t...

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Abstract

The invention relates to a manufacturing method of polyacetal copolymer. The manufacturing method is capable of reducing scales, and can stably and continuously produce high quality polyacetal copolymer in a long term in a high yield. The manufacturing method comprises the following steps: mixing cyclic ether and/or cyclic condensed formaldehyde, a polymerization catalyst, acetal, which is represented by the formula (1), with a low molecular weight, an organic solvent, and an antioxidant to obtain a pre-mixed solution; and then feeding the pre-mixed solution and trioxane into a polymerization machine to carry out polymerization. Formula (1): R-(CH2-O)n-R.... in the formula (1), the R represents a free hydrogen atom, a straight chain alkyl group or a branched alkyl group, a straight chain alkoxyl group or a branched alkoxyl group, or a hydroxyl group, and n represents an integer in a range of 1 to 20.

Description

technical field [0001] The present invention relates to a method for producing polyacetal copolymers. Background technique [0002] Conventionally, polyacetal copolymers are known to be resin materials excellent in rigidity, strength, toughness, sliding properties, and creep properties, and are widely used mainly in automobile parts, electric / electronic equipment, and various mechanical parts. [0003] In addition, the development of molding technology using polyacetal copolymers is particularly remarkable, and there is a high demand for high-molecular-weight polyacetal copolymers, and a high-productivity production method for high-molecular-weight polyacetal copolymers is desired. [0004] In addition, many parts using polyacetal copolymers are important mechanical parts, and it is necessary to stabilize their quality. Furthermore, in order to stabilize the quality, it is necessary to produce the polyacetal copolymer stably for a long period of time. [0005] In the polym...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G2/22C08G2/10
Inventor 近藤知宏土岐真
Owner ASAHI KASEI KK
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