Polyacetal resin composition and molded article thereof

A technology of polyacetal resin and polyacetal copolymer, applied in the field of polyacetal resin composition, can solve the problems of reducing formaldehyde and the like, and achieve the effects of reducing the amount of production and inhibiting exudation

Inactive Publication Date: 2009-09-23
POLYPLASTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to significantly reduce the formaldehyde generated, especially the formaldehyde generated from molded products, simply by blending the above-mentioned commonly used stabilizers into polyacetal resins with conventional formaldehyde quality.

Method used

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  • Polyacetal resin composition and molded article thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1-6

[0108] According to the composition shown in Table 1, the hindered phenolic antioxidant (B), formaldehyde trapping agent (guanamine compound) (C), isocyanate compound (D) and other compounds are blended with the polyacetal copolymer (A) to use A 30mm twin-screw extruder was melted and kneaded to prepare a granular composition. Next, using an injection molding machine, the test piece was molded from the pellets under the molding conditions (1) described above, and the amount of formaldehyde generated from the molded product was measured. Using an injection molding machine, a test piece was molded in accordance with the molding condition (2) described above, and the exudation of the molded product was observed. The results are shown in Table 1.

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Abstract

The present invention provides a polyacetal resin composition having excellent processability and stability, significantly suppressing the amount of formaldehyde generated from the molded article thereof, and preventing the bleeding of blending components. Specifically, to 100 parts by weight of (A) a polyacetal copolymer having 1.0 mmol / kg or less of hemiformal terminal group, 0.5 mmol / kg or less of formyl terminal group, and 0.5% by weight or less of unstable terminal group, there are blended: 0.01 to 3 parts by weight of (B) a hindered phenol-based antioxidant; 0.05 to 1 part by weight of (C) at least one compound selected from a guanamine compound and a triazine compound; and 0.01 to 1 part by weight of (D) a compound selected from an isocyanate compound, an isothiocyanate compound, and a modified compound thereof.

Description

Technical field [0001] The present invention relates to a polyacetal resin composition that has excellent processability and stability, significantly suppresses the amount of formaldehyde produced in molded articles, and can also prevent bleeding of the compounding components. Background technique [0002] Polyacetal resin has various excellent characteristics, and its molded products are used in a wide range of applications. However, due to its chemical structure characteristics, it has the property of being easily decomposed in a heated oxidizing atmosphere or under acidic or alkaline conditions. Therefore, the problem of polyacetal resin is to improve the thermal stability and suppress the formation of formaldehyde in the molding process or molded products. If the thermal stability is low, the polymer decomposes due to heating during processing steps such as extrusion or molding, resulting in adhesion to the mold (mold deposits), or deterioration of moldability or mechanical p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L59/00C08K3/22C08K5/09C08K5/098C08K5/13C08K5/20C08K5/29C08K5/3477C08K5/39
CPCC08K5/34C08L59/00C08K5/13C08K5/29
Inventor 长谷宽之
Owner POLYPLASTICS CO LTD
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