Cellulose microfiber-reinforced polyamide resin molded article

Abstract

Provided is a polyamide resin molded article which has both high mechanical properties and dimensional accuracy, and low friction coefficient, low wear and / or low wear properties. One embodiment of the present invention provides a polyamide resin molded article comprising a polyamide resin composition containing: (A) a polyamide resin; (B) chemically modified cellulose microfibers having a weight-average molecular weight (Mw) of 100,000 or more, a ratio (Mw / Mn) of the weight-average molecular weight (Mw) to the number-average molecular weight (Mn) of 6 or less, an average content of alkali-soluble polysaccharides of 12 mass% or less, and a crystallinity of 60% or more; and (C) a dispersant having a melting point of 80 DEG C or less and a number average molecular weight of 1000-50,000. The melting point (Tm) and the crystallization temperature (Tc) of the polyamide resin molded article satisfy the relationship represented by formula (1). (1) Tm-Tc > = 30 DEG C.

Description

technical field [0001] The present invention relates to a cellulose fine fiber-reinforced polyamide resin molded body. Background technique [0002] Polyamide resins have high heat resistance, chemical resistance, and processing characteristics, and are therefore widely used in automotive parts, electrical and electronic parts, office equipment housings, and precision parts. However, when a single resin is used, mechanical properties, slidability, thermal stability, dimensional stability, etc. may be insufficient, and a resin and various inorganic materials are usually used as a composite. [0003] Resin compositions reinforced with polyamide resins using glass fibers, carbon fibers, talc, clay, etc. as reinforcing materials of inorganic fillers have high mechanical properties and wear resistance properties, and are therefore widely used in various sliding parts. For example, Patent Document 1 describes a polyamide resin composition in which glass fibers having an average f...

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Problems solved by technology

[0016] In Patent Document 2, a pin-on-disk test (which is a relatively common sliding test) is used to test the molded composites of cellulose and polyoxymethylene, polypropylene or polyethylene hydrophobically modified with long-chain fatty acid groups. The sliding property of the body was evaluated, but it had the following problems: in the case of more than 10,000 reciprocating sliding tests, the sliding characteristics were insufficient, the coefficient of friction deteriorated, and the amount of wear increased

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