Polyacetal resin composition and molded article thereof

A technology of polyacetal resin and polyacetal copolymer, which is applied in the field of polyacetal resin composition, can solve the problem of reducing formaldehyde, etc., and achieve the effect of reducing the amount of formaldehyde generated and inhibiting oozing

Active Publication Date: 2009-10-28
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
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Effect test

preparation example Construction

[0080] The method for preparing the polyacetal resin composition of the present invention is not particularly limited, and it can be prepared by various conventionally known methods as a method for preparing a resin composition. For example, (1) a method of mixing all the components constituting the composition, supplying it to an extruder, and melting and kneading to obtain a granular composition; (2) extruding a part of the components constituting the composition The method of supplying from the main feeding port, supplying the remaining ingredients from the side feeding port, and melting and kneading to obtain a granular composition; (3) by extrusion, etc., firstly preparing granules with different compositions, and then mixing the granules, A method of adjusting to a predetermined composition, etc.

[0081] In the preparation of the composition using an extruder, it is preferable to use an extruder having one or more devolatilization vents, and it is more preferable to use...

Embodiment 1-6

[0101] According to the composition shown in Table 1, blend hindered phenolic antioxidant (B), formaldehyde trapping agent (hydrazide compound) (C), isocyanate compound (D) and other compounds in polyacetal copolymer (A), use A 30mm twin-screw extruder is used for melt mixing to make a granular composition. Next, using an injection molding machine, the pellets were molded into test pieces under the above-mentioned molding condition (1), and the amount of formaldehyde generated from the molded product was measured. Exudation from molded articles was also observed. The results are shown in Table 1.

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Abstract

Disclosed is a polyacetal resin composition which has excellent workability and stability and, when molded into an article, which is remarkably reduced in the amount of aldehyde generated from the article and shows no leaching out of any compounded component from the article. Specifically disclosed is a polyacetal resin composition comprising (A) 100 parts by weight of a polyacetal copolymer having 1.0 mmol / kg or less of a hemiformal terminal group, 0.5 mmol / kg or less of a formyl terminal group and 0.5% by weight of an unstable terminal group, (B) 0.01 to 3 parts by weight of a hindered phenol-type antioxidant, (C) 0.01 to 1 part by weight of a hydrazide compound, and (D) 0.01 to 1 part by weight of a compound selected from the group consisting of an isocyanate compound, an isothiocyanatecompound and a modified form thereof.

Description

technical field [0001] The present invention relates to a polyacetal resin composition that has excellent processability and stability, remarkably suppresses the amount of formaldehyde generated from molded articles, and prevents bleeding of compounding components. Background technique [0002] Polyacetal resin has various excellent properties, and its molded products are used in a wide range of fields, but due to its chemical structural characteristics, it has the property of being easily decomposed under a heated oxidizing atmosphere or under acidic or alkaline conditions. Therefore, the problems of polyacetal resins include improving thermal stability and suppressing generation of formaldehyde during molding processing or in molded products. If the thermal stability is low, the polymer is decomposed by heating in processing steps such as extrusion and molding, resulting in deposits on the mold (mold deposits), or degradation of moldability and mechanical properties. In a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L59/04C08K3/20C08K5/098C08K5/101C08K5/13C08K5/20C08K5/24C08K5/29C08K5/36C08K5/541C08L71/00
CPCC08K5/13C08K5/25C08L59/04C08K5/29
Inventor 川口邦明长谷宽之栗田早人池谷启
Owner POLYPLASTICS CO LTD
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