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polyacetal resin composition

A technology of polyacetal resin and composition, applied in the field of polyacetal resin composition, can solve the problems of reducing the generation of formaldehyde, insufficiently speaking, impairing the surface smoothness and surface roughness of molded products, etc. Effects of excellent wear characteristics, good surface smoothness, and excellent thermal stability

Active Publication Date: 2017-08-25
POLYPLASTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the compositions disclosed in Patent Document 1 and Patent Document 2, thermal stability is not fully considered, and it is not sufficient to reduce the generation of formaldehyde.
In addition, in the composition of Patent Document 2, the surface smoothness and surface roughness of the molded product are impaired by the inorganic powder to be compounded.
[0008] Therefore, it is difficult for the compositions disclosed in Patent Documents 1 and 2 to satisfy the high sliding properties required in recent years and the balance of other properties (surface properties (surface smoothness), thermal stability, etc.)

Method used

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preparation example Construction

[0056] The preparation method of the graft copolymer is not particularly limited, and it can be easily prepared by a known radical reaction. For example, the graft copolymer (D) can be prepared by adding a radical catalyst to the monomers constituting (d1) and monomers constituting (d2) and kneading for grafting, or adding (d1) ) component or (d2) component, adding a radical catalyst such as a peroxide to generate free radicals, which is melt-kneaded with a polymer of another component to graft the method, etc.

[0057] The ratio of (d1) olefin-based polymer to (d2) vinyl-based polymer constituting (D) the graft copolymer is preferably d1:d2=80:20 to 20:80 (mass ratio), particularly preferably d1 :d2=60:40~40:60.

[0058] In this invention, the compounding quantity of the said (D) graft copolymer is 2-10 mass parts with respect to 100 mass parts of (A) polyacetal resins. (D) When the compounding quantity of a component is less than 2 mass parts, the improvement effect of the...

Embodiment

[0077] Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited to these Examples.

[0078] Examples and Comparative Examples

[0079] Details of each component used in Examples and Comparative Examples are as follows.

[0080] (A) Polyacetal resin (POM):

[0081] A-1: Copolymer of 96.7% by mass trioxane / 3.3% by mass of 1,3-dioxolane (with respect to all terminal groups, the ratio of the total amount of methoxyl end groups and hydroxyethoxyl end groups is 95%)

[0082] A-2: Copolymer of 96.7% by mass trioxane / 3.3% by mass of 1,3-dioxolane (with respect to all terminal groups, the ratio of the total amount of methoxyl end groups and hydroxyethoxyl end groups is 99%)

[0083] A'-3: Copolymer of 96.7% by mass trioxane / 3.3% by mass of 1,3-dioxolane (ratio of the total amount of methoxy end groups and hydroxyethoxy end groups to all end groups was 83%)

[0084] The preparation method of polyacetal resin A-1

[0085] A mixture...

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Abstract

The present invention provides a polyacetal resin composition which is excellent in friction and wear characteristics, can suppress the generation of friction noise during sliding, and has good surface smoothness and excellent thermal stability of molded products, which is compared to 100 Specified (A) polyacetal resin compounding 0.01-1 mass parts (B) hindered phenolic antioxidant, 0.05-2 mass parts specific (C) basic nitrogen-containing compound, 2-10 mass parts specific (D) a graft copolymer, and 0.5 to 5 parts by mass of a specific (E) fatty acid ester to prepare a polyacetal resin composition substantially free of inorganic fillers.

Description

technical field [0001] The present invention relates to polyacetal resin compositions. 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, electrical and electronic components, etc., and progress in utilization methods and processing technologies of polyacetal resins continues. Under such circumstances, the properties required for polyacetal resin tend to be advanced or specialized. As one example, while maintaining the excellent surface smoothness of polyacetal resin, it is strongly required to improve the basic sliding characteristics represented by the coefficient of friction and the amount of wear, and especially to suppress friction noise during sliding. . In addition, it is desired that it has excellent thermal stability and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L59/00C08L51/06C08L77/00C08K5/00C08K5/134C08K5/3492C08K5/31C08K5/25C08K5/103
Inventor 霜田晓英
Owner POLYPLASTICS CO LTD
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