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Polyamide resin composition

A technology of polyamide resin and composition, which is applied in the field of polyamide resin composition, and can solve problems such as sink marks of molded products, inability to continuously obtain good products, poor appearance of molded products of polyamide resin composition, etc.

Pending Publication Date: 2021-10-29
TOYOBO MC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, even if the talc content is the same, there are cases where the molded product of the polyamide resin composition has poor appearance or sink marks in the molded product
Especially in the case of exterior parts, even if the molding conditions are changed, good products cannot be continuously obtained, and there is still a problem that the defective rate increases, so there is still room for improvement

Method used

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  • Polyamide resin composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] In such a way that the composition shown in Table 1 was obtained, each raw material other than talc was mixed in advance and supplied from the original feed port. In addition, the talc was supplied to the L / D45 twin-screw extruder (Nippon Steel Works) from another side feed port. TEX54αII) produced by the company, was melt-kneaded. After being drawn into strands from a die, the strands were passed through a water tank to cool and solidify, and the strands were cut with a pelletizer to obtain polyamide resin composition pellets. The barrel temperature of the extruder was set to 260° C., and the screw speed, discharge rate, and Q / N were set to the production conditions in Table 1. The obtained granules were dried with a hot air dryer until the moisture content was 0.05% or less, and then various characteristics were evaluated. The evaluation results are shown in Table 1.

Embodiment 2～8、 comparative example 2

[0085] A part of talc was mixed in advance in the same manner as other raw materials and supplied from the raw material inlet, and the production conditions in Table 1 were set, and pellets were produced and evaluated in the same manner as in Example 1.

[0086]

[0087] According to the results in Table 1, if the polyamide resin and talc are included in the specified range, and the average secondary particle size of the talc is within the specified range, a polyamide resin with excellent molded appearance without floating or sink marks of the reinforcing material can be obtained. The amide resin composition also has excellent handling stability without talc blowing out during melt-kneading.

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Abstract

The present invention is a polyamide resin composition which contains 50-90% by mass of (A) a crystalline polyamide resin and 9-49% by mass of (B) a talc, and which preferably additionally contains (C) a coupling agent and (D) a fatty acid metal salt. The average particle diameter of the secondary particles of the talc (B) in this polyamide resin composition is larger than 30 [mu]m; and a molded article of this polyamide resin composition is not susceptible to the occurrence of appearance defects or sink, and is able to stably achieve characteristics within desired ranges.

Description

technical field [0001] The present invention relates to a polyamide resin composition, and more specifically, to a polyamide resin composition containing a large amount of talc as a reinforcing material. Background technique [0002] As a method of improving the disadvantages of polyamide resins such as dimensional changes due to water absorption, lower rigidity, and low heat distortion temperature, the addition of fibers such as glass fibers or carbon fibers, or inorganic fillers such as talc and calcium carbonate as reinforcing materials has long been known. [0003] When a large amount of granular inorganic filler such as talc is blended, it is difficult to mix sufficiently by simple dry blending using a single-screw extruder because the polyamide resin and the granular inorganic filler have a large difference in bulk density. Therefore, after attaching a coupling agent and water to a polyamide resin, a polyamide resin composition having a desired talc content is produced...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K5/098C08L77/00C08K3/013C08K3/34
CPCC08K5/098C08L77/02C08K3/346C08K2201/005C08K5/544C08L77/06C08G69/00C08K13/02
Inventor 阿曾英王久保田修司鲇泽佳孝
Owner TOYOBO MC CORP