Manufacturing method of polyacetal copolymer

A technology of polyacetal copolymer and manufacturing method, which is applied in the field of polyacetal copolymer manufacture, and can solve the problems of not fully solving the problem of tar-like precipitates such as the generation of scale

Active Publication Date: 2014-10-01
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, in the technologies of Documents 1 to 3, the generation of scale in the supply part of the polymerizer and the generation of tar-like precipitates caused by the polymerization catalyst are not sufficiently solved, and these two problems cannot be solved at the same time.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] 63 g of boron trifluoride n-butyl ether complex as a polymerization catalyst and 2275 g of cyclohexane as an organic solvent were supplied to a preparation container with a circulation function by using a pump, and mixed for 20 minutes at a temperature of 28° C. (first mixing ).

[0094] Next, at a temperature of 25°C and a mixing time of 10 minutes, mix 6.68 g / hour of the above-mentioned first mixture with 120.9 g / hour of 1,3-dioxolane as a cyclic ether and / or cyclic formal Mixing takes place continuously in the pipeline (secondary mixing).

[0095] The above-mentioned second mixing uses a static mixer.

[0096] The concentration of the polymerization catalyst in the above-mentioned second mixture is 1.41×10 -1 quality%.

[0097] A jacketed twin-shaft paddle-type continuous polymerization reactor (manufactured by Kurimoto Iron Works, 5.08 cm in diameter, L / D=14.8) capable of circulating the heat medium was adjusted to 80° C., and 127.58 g / hour The above-mentioned s...

Embodiment 2

[0101] The conditions were the same as in Example 1, but the polymerization conditions were changed halfway.

[0102] After 100 hours of polymerization under the same conditions as in Example 1, the conditions were changed to 72.9 g / hour of the above-mentioned second mixture, 2000 g / hour of trioxane, and 1.4 g / hour of formal. After 100 hours of polymerization, the conditions were changed to 182.26 g / hour of the above-mentioned second mixture, 5000 g / hour of trioxane, and 3.4 g / hour of formal, and polymerization was carried out for 100 hours.

[0103] The results are shown in Table 1.

Embodiment 3～4

[0105] The amounts of the polymerization catalyst and the organic solvent were changed to those shown in Table 1. Other conditions were the same as in Example 1 to obtain a polyacetal copolymer. The results are shown in Table 1.

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Abstract

The invention provides a manufacturing method of polyacetal copolymer. During the process of copolymerization between trioxacyclohexane and cyclic ether/cyclic formal, the scales on the feeding part of the polymerization device are reduced, and the tar-liked precipitate caused by the catalyst will not appear, so the device can be operated stably for a long term even if the operation conditions are changed, and only a little of catalyst can maintain the polymerization yield. Before the copolymerization between trioxacyclohexane and cyclic ether/cyclic formal, a polymerization catalyst should be mixed with an organic solvent at first, then cyclic ether and/or cyclic formal is added into the solvent, and finally the mixture and trioxacyclohexane are fed into a polymerization reactor.

Description

technical field [0001] The present invention relates to a method for producing polyacetal copolymers obtained by copolymerizing trioxane with cyclic ethers and / or cyclic formals. Background technique [0002] Polyacetal copolymers are resin materials excellent in rigidity, strength, toughness, sliding properties, and creep properties, and are widely used mainly in automotive parts, electrical / electronic equipment, and various mechanical parts. These components are important mechanism components whose demand has grown significantly in recent years. In order to cope with such a large increase in demand, it is important to manufacture polyacetal copolymers stably over a long period of time. However, there are various obstacles in the long-term stable production of polyacetal copolymers. [0003] As the main factors hindering the long-term stable operation, there are: 1) Scale is generated in the part that supplies each component to the polymerizer, and the polymerizer must be...

Claims

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Application Information

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