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Polyacetal resin composition

A technology of polyacetal resin and resin composition, applied in the field of polyacetal resin composition and its preparation, can solve the problem of exudation of carboxylic acid hydrazide, low formability, and no specific disclosure of thermal stability of resin composition, etc. problems, to achieve the effect of improving quality, improving formability, and improving weather resistance (light)

Inactive Publication Date: 2006-11-15
POLYPLASTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when such a short-chain aliphatic carboxylic acid hydrazide is used, although the thermal stability can be improved to some extent and the generation of formaldehyde can be suppressed, the moldability is low, mold deposition occurs, or carboxylic acid hydrazide is removed from the mold. Leakage from products
In addition, there is no specific disclosure in this document which alicyclic dicarboxylic acid dihydrazide can improve the thermal stability of the resin composition

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～14 and 16～19

[0171] According to the ratio shown in Table 1 and Table 2, in 100 parts by weight of polyacetal resin copolymer, premixed carboxylic acid hydrazide, antioxidant, processing stabilizer, heat-resistant stabilizer, colorant, weather-resistant (light) stabilizer After the preparation, it was charged into the main inlet of a 30 mm diameter twin-screw extruder having one vent port, and melt-mixed to prepare a granular composition. Using the obtained pellets, predetermined test pieces were molded with an injection molding machine, and the amount of formaldehyde generated from the test pieces was evaluated. The results are shown in Table 1 and Table 2.

Embodiment 15

[0173] According to the ratio shown in Table 2, in 95 parts by weight of polyacetal resin copolymer, after premixing antioxidant, processing stabilizer and heat-resistant stabilizer, extrude by a 30mm diameter twin-screw with 1 exhaust port The main feed port of the machine is put into, and the mixture of 5 parts by weight of polyacetal resin copolymer powder and 0.1 part by weight of carboxylic acid hydrazide is put into the side feed port provided after the exhaust port simultaneously, and melted and mixed to prepare granules shaped composition. Using the obtained pellets, predetermined test pieces were molded with an injection molding machine, and the amount of formaldehyde generated from the test pieces was evaluated. The results are shown in Table 2.

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PUM

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Abstract

A polyacetal resin composition comprises a polyacetal resin, and at least one carboxylic acid hydrazide selected from a saturated or unsaturated long-chain aliphatic carboxylic acid hydrazide, a saturated or unsaturated alicyclic carboxylic acid hydrazide, a dimer acid or trimer acid hydrazide, and an oxycarboxylic acid hydrazide corresponding to each of these hydrazides. The proportion of the carboxylic acid hydrazide may be about 0.001 to 20 parts by weight relative to 100 parts by weight of the polyacetal resin. The polyacetal resin composition may further comprise at least one member selected from an antioxidant, a heat stabilizer, a processing stabilizer, a weather (light)-resistant stabilizer, an impact resistance improver, a slip-improving agent, a coloring agent, and a filler. With the use of such a resin composition, stability of a polyacetal resin is improved, and formaldehyde emission is inhibited.

Description

technical field [0001] The present invention relates to a polyacetal-based resin composition that significantly suppresses the generation of formaldehyde, is excellent in extrusion processability and molding processability, and can suppress blooming, a production method thereof, and a molded article formed from the resin composition. Background technique [0002] Polyacetal resins are widely used in automotive parts, electrical and electronic equipment parts, other precision machinery parts, building materials, piping parts, Life and cosmetic parts, medical parts and other fields. However, with the expansion and diversification of applications, polyacetal resins with better quality are demanded. [0003] The properties required for polyacetal resins include, for example, that the mechanical strength does not decrease in processing steps such as extrusion or molding, that no deposits (mold deposits) on metal molds occur, and that the polyacetal resin does not suffer from det...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L59/00C08K5/25C08L71/02C08L83/04
CPCC08K5/25C08L59/00B29B11/10B29B9/06C08J5/00
Inventor 原科初彦
Owner POLYPLASTICS CO LTD
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