Polyamide Resin Slider for Slide Fasteners
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Solution Overview
Problem
Current polyamide resin sliders for slide fasteners lack sufficient strength and durability, particularly due to high tensile stress and friction during use, and existing solutions have not adequately addressed the balance between these mechanical properties.
Innovation Solution
A resin slider composition combining an aliphatic polyamide with a melting point of 220-310°C and an aromatic polyamide with a melting point of 230-310°C, along with reinforcing fiber, where the aromatic polyamide ratio is 10-50% by mass, and the melting point difference between the two polyamides is 50°C or less, enhancing both strength and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polyamide resin is used for slider, then ease of manufacture is improved, but strength and durability are insufficient
Solution Approach 1:
The patent uses a composite material system consisting of polyamide resin combined with specific additives including silane coupling agents and inorganic fillers. This composite approach allows the slider to maintain ease of injection molding while significantly improving tensile strength and abrasion resistance through the synergistic effects of the resin matrix and reinforcing additives
2Ease of manufacture
If polyamide resin is used for slider, then ease of manufacture is improved, but durability is insufficient
Solution Approach 1:
The patent employs a composite material formulation where polyamide resin is combined with silane coupling agents and inorganic fillers. This composite structure enhances durability by improving the resin's resistance to washing, ironing, and sliding abrasion while preserving the ease of manufacture through injection molding
Solution Approach 2:
The patent modifies the chemical and physical parameters of the polyamide resin by controlling the molecular weight, adding specific additives, and adjusting the composition ratios. These parameter changes enhance the resin's durability properties such as wash fastness, ironing resistance, and abrasion resistance while maintaining manufacturability
3Strength
If glass fiber is added to polyamide, then strength is improved, but manufacturing precision deteriorates
Solution Approach 1:
The patent introduces silane coupling agents as intermediary substances that bridge the polyamide resin and inorganic fillers or glass fibers. This intermediary layer improves the interfacial bonding, allowing strength enhancement while maintaining good flowability and filling properties during injection molding, thus preserving manufacturing precision
Solution Approach 2:
The patent carefully controls the particle size, aspect ratio, and content of glass fibers or inorganic fillers. By optimizing these parameters and using silane coupling agents, the resin composition achieves both high strength and good moldability with reduced defects, maintaining manufacturing precision
Data Source
AI summary
Provided is a polyamide resin slider for a slide fastener which provides both strength and durability. The slider material is a polyamide resin composition that includes an aliphatic polyamide having a melting point of 220° C. to 310° C., an aromatic polyamide having a melting point of 230° C. to 310° C., and reinforced fiber; wherein the ratio of the aromatic polyamide present in the summed mass of the aliphatic polyamide and the aromatic polyamide is greater than or equal to 10% by weight and less than or equal to 50% by weight.