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Polyacetal resin composition

A polyacetal resin and resin composition technology, applied in the field of molded products, can solve the problems of insufficient suppression of mold deposition and exudation, improvement of thermal stability of resin composition, and exudation of carboxylic acid hydrazide, etc., to achieve improved peripheral Environment, improvement of thermal stability, effect of physical property improvement

Inactive Publication Date: 2007-01-03
POLYPLASTICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the use of such a short-chain aliphatic carboxylic acid hydrazide improves the thermal stability to some extent and can also suppress the generation of formaldehyde, but the moldability is low, and mold deposition occurs, which will cause the carboxylic acid hydrazide to change from the molding process. seepage
This document does not disclose what kind of arylene dicarboxylic acid dihydrazide can improve the thermal stability of the resin composition
Also, even with monocyclic aromatic carboxylic acid hydrazides, mold deposition and bleeding cannot be sufficiently suppressed

Method used

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preparation example Construction

[0141] (Manufacturing method of polyacetal resin composition)

[0142]The polyacetal resin composition of the present invention can be powder granular mixture or melting mixture, can mix polyacetal resin and polycyclic aromatic carboxylic acid hydrazide, and other additives [stabilizer (antioxidant, processing stabilizing agent] as required agent, heat-resistant stabilizer and weather-resistant (light) stabilizer), impact modifier, sliding property modifier, coloring agent and / or filler] are prepared by mixing by a usual method. For example, the following methods can be used: (1) Feed all the ingredients from the main feeding port, knead and extrude through an extruder (single-screw or twin-screw extruder, etc.) to make pellets, and then carry out molding Method; (2) will not contain above-mentioned polycyclic aromatic carboxylic acid hydrazide composition (polyacetal resin, above-mentioned other additives etc.) by main feeding port feeding, will at least contain above-mention...

Embodiment 1-13 and 18-20

[0175] According to the ratio shown in Table 1 and Table 2, premix polycyclic aromatic carboxylic acid hydrazide, antioxidant, processing stabilizer, heat-resistant stabilizer, coloring agent, weather resistance in 100 parts by weight of polyacetal resin copolymer The (light) stabilizer was then added to the main feed port of a 30 mm diameter twin-screw extruder with a vent port, melt mixed, and made into a pellet-like composition. The obtained pellets were molded into predetermined test pieces by an injection molding machine, and the formaldehyde generation amount of the test pieces was evaluated. The results are shown in Table 1 and Table 2.

Embodiment 14-16

[0177] According to the ratio shown in Table 2, in 95 parts by weight of polyacetal resin copolymer (a-1), premix polycyclic aromatic carboxylic acid hydrazide (b-1), antioxidant (c-1), process Stabilizer (d-1), heat-resistant stabilizer (e-1), then from the main feed inlet of a 30mm diameter twin-screw extruder with an exhaust port, simultaneously from the rear of the exhaust port The side feeding port adds the granule of 5 weight parts polyacetal resin copolymer (a-1) and 0.05 weight part heat-resistant stabilizer [is (e-5) in the embodiment 14, is (e in the embodiment 15) -6), the mixture that is (e-7) heat-resistant stabilizer] in embodiment 16, melt mix, make the composition of pellet shape. The obtained pellets were molded into predetermined test pieces by an injection molding machine, and the formaldehyde generation amount of the test pieces was evaluated. The results are shown in Table 2.

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Abstract

A polyacetal resin composition is composed of a polyacetal resin and a polycyclic aromatic carboxylic acid hydrazide which may have a substituent. With respect to 100 parts by weight of the polyacetal resin, the ratio of the polycyclic aromatic carboxylic acid hydrazide may be about 0.001-20 parts by weight. The above-mentioned polyacetal resin composition can also contain at least one selected from the group consisting of antioxidants, heat-resistant stabilizers, processing stabilizers, weather-resistant (light) stabilizers, impact resistance modifiers, slipperiness modifiers, colorants and fillers. kind. The resin composition improves the stability of the polyacetal resin and suppresses the occurrence of formaldehyde.

Description

technical field [0001] The present invention relates to a polyacetal resin composition that significantly suppresses the generation of formaldehyde, is excellent in molding processability, and can suppress blooming, a method for preparing the same, and a molded article formed from the resin composition. Background technique [0002] Polyacetal resin has excellent mechanical properties, fatigue resistance, friction and wear resistance, chemical resistance and moldability, so it is used in automotive parts, electrical and electronic instrument parts, other precision mechanical parts, building materials, piping components, life, etc. Widely used in cosmetic parts, medical parts and other fields. However, along with the expansion and diversification of applications, there is a demand for polyacetal resins with better quality. [0003] The characteristics required for polyacetal resins are: no reduction in mechanical strength during processing steps such as extrusion or molding ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L59/00C08K5/25C08L71/02C08L83/04
CPCC08L59/00C08G2/24
Inventor 原科初彦
Owner POLYPLASTICS CO LTD
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