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Polyacetal resin composition and method for producing same

A polyacetal resin and a technology for a production method, which are applied in the field of polyacetal resin compositions, can solve problems such as difficult formaldehyde formaldehyde, and achieve the effects of inhibiting mold scale, reducing the amount of formaldehyde generated, and having excellent friction and wear characteristics.

Active Publication Date: 2020-12-29
POLYPLASTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, it is difficult to significantly reduce the formaldehyde generated, especially the formaldehyde generated from self-molded products, only by compounding such a general-purpose stabilizer with a general formaldehyde-quality polyacetal resin.

Method used

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  • Polyacetal resin composition and method for producing same
  • Polyacetal resin composition and method for producing same
  • Polyacetal resin composition and method for producing same

Examples

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preparation example Construction

[0104] In the preparation of the composition using an extruder, it is preferable to use an extruder having one or more devolatilization vents, and furthermore, to any position from the main feed port to the devolatilization vent, the relative 100 parts by mass of the polyacetal polymer is about 0.1 to 10 parts by mass of water and low-boiling point alcohols, and formaldehyde and the like generated during the extrusion process are preferably devolatilized and removed from the devolatilization exhaust port together with water and low-boiling point alcohols . Thereby, the amount of formaldehyde generated from the polyacetal resin composition and its molded article can be further reduced.

[0105] The polyacetal resin composition of the present invention thus prepared can be molded by conventionally known various molding methods such as injection molding, extrusion molding, compression molding, vacuum molding, blow molding, and foam molding.

[0106] The present invention also in...

Embodiment

[0109] Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited to these. In addition, "part" in an Example and a comparative example means a mass part. In addition, each property evaluated in the Example and the comparative example and its evaluation method are as follows. The units of the numerical values ​​described in Tables 1 and 2 are parts by mass.

[0110] The various components shown in Tables 1 and 2 were added and mixed at the ratios shown in Tables 1 and 2, and melt-kneaded in a vented twin-screw extruder to prepare a pellet-like composition.

[0111] The components described in Tables 1 and 2 used in Examples are the following components.

[0112] ·(A) Polyacetal polymer

[0113] A-1: Using a twin-shaft paddle-type continuous polymerizer, continuously supply 1,3-dioxolane to all monomers (trioxane and 1,3-dioxolane) 3.3% by mass, trioxane of 1000ppm methylal, while supplying boron trifluoride dibutyl etherate to th...

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PUM

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Abstract

The purpose of the present invention is to provide a polyacetal resin composition which has excellent sliding properties, while being suppressed in the generation of formaldehyde and mold fouling during molding; and a method for producing the polyacetal resin composition. The purpose of the present invention is achieved by the polyacetal resin composition obtained by blending at least the following components of (A) 100 parts by mass of a polyacetal polymer, (B) 0.01-1 part by mass of a hindered phenol antioxidant, (C) 0.01-0.50 part by mass of an aliphatic carboxylic acid hydrazide, (D) 0.001-0.50 part by mass of a hydantoin compound having two hydrazino carbonyl alkyl groups, (E) 0.001-0.30 part by mass of an alkaline earth metal salt of an aliphatic carboxylic acid, (F) 2-10 parts by mass of a graft copolymer, and (G) 0.5-5 parts by mass, wherein the total amount of (C) and (D) is 0.03-0.55 parts by mass relative to 100 parts by mass of the polyacetal polymer (A), the main chain ofthe graft copolymer (F) is polyethylene and contains an acrylonitrile-styrene copolymer as a side chain, and (G) the fatty acid ester is a fatty acid ester comprising a fatty acid having 12-32 carbonatoms and a monohydric alcohol or a polyhydric alcohol having 2-30 carbon atoms.

Description

technical field [0001] The present invention relates to a polyacetal resin composition whose molded product has excellent friction and wear characteristics, the amount of formaldehyde generated from the molded product is significantly suppressed, and mold deposits during molding are stably suppressed, and a method for producing the same. Background technique [0002] Polyacetal resin has well-balanced mechanical properties, and is excellent in friction and wear characteristics, chemical resistance, heat resistance, electrical characteristics, and the like. Therefore, polyacetal resins are widely used in the fields of automobiles, electric and electronic components, and the like, and advances in utilization forms and processing techniques of polyacetal resins are continuing. Under such circumstances, there is a tendency for the characteristics required of the polyacetal resin to be advanced or specialized. As an example, polyacetal resins are required to improve the sliding ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L59/00C08L51/06C08K13/02C08K5/13C08K5/098C08K5/25C08K5/3445C08K5/103
CPCC08L59/00C08L2201/08C08L51/06C08K13/02C08K5/13C08K5/098C08K5/25C08K5/3445C08K5/103
Inventor 玉冈章宏门间智宏原科初彦
Owner POLYPLASTICS CO LTD
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