Preparing method of polyacetal copolymer

A technology of polyacetal copolymer and manufacturing method, applied in the field of polyacetal copolymer manufacturing, can solve the problems of reduced polymerization yield, inability to stabilize raw materials, fouling, etc., achieve high polymerization yield, and maintain polymerization for a long time Yield, effect of reducing scaling

Active Publication Date: 2015-02-11
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 described above, in order to stabilize the quality of parts using polyacetal, it is important to operate stably for a long time during the polymerization of polyacetal copolymers. The reasons for the l

Method used

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  • Preparing method of polyacetal copolymer
  • Preparing method of polyacetal copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0140] A sleeved twin-shaft paddle-type continuous polymerization reactor (manufactured by Kurimoto Iron Works, diameter 2B, L / D=14.8) through which a heat medium can pass was adjusted to 80°C.

[0141] 0.18 g / hour of boron trifluoride n-butyl ether complex as a polymerization catalyst, 0.025 g / hour of methanol as alcohols, 6.5 g / hour of cyclohexane (boiling point: 80.74° C.) as an organic solvent, 120.9 g / hour 1,3-dioxolane as a cyclic ether and / or cyclic formal was premixed continuously at a temperature of 50° C. and a mixing time of 2 minutes to obtain a premixed liquid.

[0142] A static mixer was used for the preparation of the above-mentioned premix liquid.

[0143] 127.61 g / hour of the above-mentioned premixed solution was continuously supplied to the polymerization reactor through a pipe, and 3500 g / hour of trioxane and 3.9 g / hour of trioxane which was a formal of a low-molecular-weight acetal compound were supplied. The alkane mixture was continuously supplied to a ...

Embodiment 2～11

[0149] The composition of the raw materials and the preparation conditions of the premix solution were changed as shown in Table 1 below.

[0150] Other conditions were the same as in Example 1 to obtain a polyacetal copolymer.

[0151] The evaluation results are shown in Table 1 below.

Embodiment 12

[0153] Using the same polymerization reactor as in Example 1, using 0.025 g / hour of methanol as alcohols and 120.9 g / hour of 1,3-dioxolane as cyclic ether and / or cyclic formal, they were first Mixing was continued at a temperature of 50°C.

[0154] Mix using a static mixer.

[0155] Next, 0.18 g / hour of boron trifluoride n-butyl ether complex as a polymerization catalyst and 6.5 g / hour of cyclohexane (boiling point: 80.74° C.) as an organic solvent were continuously premixed for a mixing time of 2 minutes, Get a premix.

[0156] A static mixer was used for the preparation of the above-mentioned premix liquid.

[0157] 127.61 g / hour of the above-mentioned premixed solution was continuously supplied to the above-mentioned polymerization reactor through a pipe, and 3500 g / hour of trioxane and 3.9 g / hour of trioxane as a formalized low-molecular-weight acetal compound The hexane mixture was continuously supplied to a polymerization reactor through a pipe, and polymerized to obt...

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Abstract

The present invention provides a method for producing a polyacetal copolymer which is less in generation amount of scale, allows a high yield of high quality polyacetal copolymer, and can maintain a polymerizatioin rate. A method of manufacturing a polyacetal copolymer polyethylene, which is performed trioxane with a cyclic ether and / or method for producing the polyacetal copolymer of polymerizable cyclic formals, comprises: a step of preparing a premixed solution from a cyclic ether and / or a cyclic formal, a polymerization catalyst and at least one alcohol represented by the following general formula (1); and a polymerization reaction from the pre-mixed solution and trioxane fed to a the polymerization reactor device, wherein R- (CH2-O) n-H ... (1) (formula (1), R represents a group selected group consisting of hydrogen, straight-chain or branched-chain alkyl group, branched or linear alkoxy and the group consisting of a hydroxyl group in any one. The n represents an integer ranging from 1 to 20).

Description

technical field [0001] The present invention relates to a method for producing polyacetal copolymers. Background technique [0002] Polyacetal copolymers have long been known to be excellent resin materials in terms of rigidity, strength, toughness, sliding properties, and creep properties, and are widely used mainly in automotive parts, electrical and electronic equipment, and various mechanical parts. [0003] In addition, the development of molding technology using polyacetal copolymers is also remarkable, the demand for high molecular weight polyacetals is high, and the production method of 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 essential to produce the polyacetal copolymer stably for a long period of time. [0005] Trioxane is usually used as a raw material in...

Claims

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Application Information

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IPC IPC(8): C08G2/22
Inventor 近藤知宏土岐真
Owner ASAHI KASEI KK
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