Polyamide Resin Molded Body Sliding Properties
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Solution Overview
Problem
Existing methods for improving the sliding and mechanical properties of polyamide resin molded bodies, such as those involving fluorine series resins, face challenges like decreased mechanical strength, high costs, and potential impairment of resin characteristics, particularly when using high-temperature melt kneading or electron beam irradiation.
Innovation Solution
A polyamide resin molded body is created with a fluorine series resin dispersed to a specific particle diameter and crystallinity level within the polyamide resin, maintaining primary particle form and secondary particle aggregation, which enhances sliding and mechanical properties without compromising cost or resin integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-temperature melt kneading is used to disperse fluorine series resin, then sliding properties are improved, but mechanical strength decreases due to deterioration of polyamide resin
Solution Approach 1:
The patent changes the particle size parameter of the fluorine series resin from conventional large particles to fine particles with number average particle diameter of 10 μm or less. This parameter change allows effective dispersion at lower temperatures, preventing polyamide resin deterioration while maintaining improved sliding properties through fine fluorine resin distribution.
Solution Approach 2:
The fluorine series resin is pre-processed to achieve fine particle size before blending with polyamide resin. This preliminary size reduction enables the resin to disperse effectively at lower processing temperatures, avoiding the need for high-temperature kneading that would deteriorate the polyamide resin and reduce mechanical strength.
2Reliability
If electron beam irradiation is used to modify fluorine series resin, then sliding properties are improved, but cost increases and resin characteristics may be impaired
Solution Approach 1:
The patent extracts and eliminates the electron beam irradiation step from the conventional process. Instead of modifying fluorine series resin through costly electron beam treatment, the invention achieves improved sliding properties through physical dispersion of fine particles, removing the expensive and potentially harmful irradiation process entirely.
3Reliability
If fluorine series resin content is increased to improve sliding properties, then sliding performance increases, but mechanical properties such as toughness and impact resistance decrease
Solution Approach 1:
The patent changes the particle size parameter to fine particles (number average diameter 10 μm or less), which allows effective dispersion at lower concentrations. This enables achieving superior sliding properties with only 1-15 parts by mass of fluorine series resin per 100 parts of polyamide resin, preventing excessive fluorine resin content that would compromise mechanical properties.
Solution Approach 2:
The fine fluorine series resin particles are uniformly distributed throughout the polyamide resin matrix, creating local lubrication zones without forming large aggregates. This uniform local distribution provides consistent sliding improvement while maintaining the structural integrity and mechanical properties of the base polyamide resin.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The approach results in a polyamide resin molded body with superior sliding properties and a balanced mechanical performance, including toughness and impact resistance, suitable for various applications.
Implementation Method 1
a molded body molded employing a polyamide resin composition in which the number average particle diameter of a fluorine series resin dispersed in a polyamide resin is 0.8 μm or less
Data Source
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AI summary
[Objective] To provide a molded body formed by a polyamide resin composition having superior sliding properties as well as a superior balance with mechanical properties such as toughness and impact resistance. [Constitution] A polyamide resin molded body is formed by a resin composition having a (B) fluorine series resin within a range from 1 to 15 parts by mass with respect to 100 parts by mass of a (A) polyamide resin. In the resin composition, the number average particle diameter of the fluorine series resin dispersed in the polyamide resin is 0.8 µm or less. The resin composition includes particles of the (B) fluorine series resin having particle diameters of 0.8 µm or greater, and the percentage of particles having particle diameters of 0.8 µm or greater which are secondary particles while maintaining the form of primary particles is 60% or greater, and/or the degree of crystallinity of the dispersed (B) fluorine series resin is 42 J/g or greater.