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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 use limitation, polyacetal resin does not meet the requirements, etc., and achieve the effect of less mold pollution

Active Publication Date: 2022-04-19
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current situation is that conventional polyacetal resins do not meet this requirement, and their use is limited.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0188]

[0189] 0.05 parts by mass of the (B-1) component, 0.1 part by mass of the (C-1) component and 0.005 parts by mass and a mixture was obtained. The mixture is fed from the top feed inlet of a twin-screw extruder with a 30mm vent hole set at 200°C, under the conditions of 80rpm screw speed, exhaust decompression degree-0.09MPa, and discharge rate of 5kg / hour Melt-kneading was carried out at a temperature of 10° C. to form pellets, and then dried at a hot air temperature of 80° C. for 3 hours to prepare a pellet-like polyacetal resin composition (polyacetal resin pellets). Then, the above-mentioned measurement and evaluation were performed on the prepared polyacetal resin pellets. The results are shown in Table 1.

Embodiment 2～18、 comparative example 1～14

[0191] Except having set the composition as shown in Table 1 or Table 2, the same operation as Example 1 was performed, and the polyacetal resin pellet was produced. Then, the above-mentioned measurement and evaluation were performed on the prepared polyacetal resin pellets. The results are shown in Table 1 or Table 2.

[0192]

[0193]

[0194] As can be seen from Table 1 and Table 2, in Examples 1 to 18, the thermal decomposition of the polyacetal resin in a high-temperature environment is small, and the amount of formaldehyde generated from the molded article containing the polyacetal resin composition is small, and the mold contamination is also small. few. Moreover, about long-term heat aging resistance, Examples 1-18 were more favorable than the example (for example, comparative example 4) to which the fatty acid metal salt was not added. It should be noted that, from Comparative Examples 10, 11, etc., when a sodium salt is used instead of a calcium salt, at leas...

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Abstract

The present invention provides a polyacetal resin composition which has little thermal decomposition of the polyacetal resin even in a high-temperature environment, and which can produce a polyacetal resin having excellent long-term heat aging resistance and reduced formaldehyde emission. Molded products, and less mold contamination. A polyacetal resin composition, which contains: (A) 100 parts by mass of polyacetal resin, (B) 0.001 to 0.2 parts by mass of nitrogen-containing hindered phenolic compound, (C) 0.001 mass part of nitrogen-free hindered phenolic compound 0.4 to 0.4 parts by mass, and (D) 0.001 to 0.1 parts by mass of calcium salt of a long-chain fatty acid having 22 to 30 carbon atoms.

Description

technical field [0001] The present invention relates to polyacetal resin compositions. Background technique [0002] Polyacetal resin is a crystalline resin with excellent rigidity, strength, toughness, slidability, and creep properties, so it has been widely used as a material for structural parts such as automotive parts, electrical and electronic parts, and industrial parts. [0003] In addition, in recent years, the use of polyacetal resins has expanded and diversified, and along with this, the demand for quality has gradually increased. Furthermore, especially for use in a high-temperature environment, thermal stability and long-term heat aging resistance (properties capable of maintaining sufficient mechanical properties for practical use when left in a high-temperature environment for a long period of time) are required. However, the current situation is that conventional polyacetal resins are not at a level that satisfies this requirement, and their use is limited. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L59/00C08L33/26C08K5/25C08K5/3492C08K5/098C08K5/134
CPCC08L59/00C08K5/34924C08K5/34922C08K2201/014C08L2201/08C08L33/26C08K5/00C08K5/25C08K5/3492C08K5/098C08K5/1345
Inventor 工藤修一
Owner ASAHI KASEI KK
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