Biodegradable Hook Fastener with Starch-PBS Composite
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Solution Overview
Problem
Molded hook surface fasteners made from biodegradable resins like polybutylene succinate and polyethylene adipate have low decomposition rates in natural environments, leading to environmental pollution, and the hook engaging elements are prone to breaking during production, resulting in poor appearance and reduced commercial value.
Innovation Solution
A molded hook surface fastener composed of a resin mixture with polybutylene succinate as the continuous phase and starch as the dispersed phase, incorporating polyvinyl alcohol, modified starch with high amylose content, and optional additives like clay and saturated fatty acids, which are processed using a specific pultrusion molding method to prevent breakage and enhance biodegradability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a molded surface fastener is made of biodegradable resin (polybutylene succinate or polyethylene adipate), then it can be degraded in natural environment, but the decomposition rate is low and it maintains original shape even after one year
Solution Approach 1:
The patent uses a composite resin material consisting of polybutylene succinate as the continuous phase and starch as the dispersed phase. This composite structure combines the biodegradability of starch with the mechanical strength and processability of polybutylene succinate, achieving both rapid decomposition (within one year) and structural integrity during use. The starch particles provide degradation pathways while the polybutylene succinate matrix maintains form stability.
2Productivity
If the pultrusion molding method is used to produce molded surface fastener, then it can be manufactured efficiently, but the hook engaging element is broken when pulled out from the cavity
Solution Approach 1:
The patent modifies the resin composition parameters by incorporating starch (1-20 parts by weight) into the polybutylene succinate matrix. This parameter change reduces the resin's viscosity and improves its flow characteristics during pultrusion molding, allowing the molten resin to fully fill the hook-shaped cavities and be pulled out without breaking the hook engaging elements, while maintaining manufacturing efficiency.
3Loss of time
If starch is dispersed in polybutylene succinate to increase decomposition rate, then biodegradability improves, but the hook engaging element is easily broken when pulled out from the cavity
Solution Approach 1:
The patent optimizes the starch content parameter to a specific range (1-20 parts by weight per 100 parts of polybutylene succinate). This optimized parameter balance ensures sufficient starch particles for rapid decomposition while maintaining enough continuous polybutylene succinate phase to provide structural strength and prevent hook engaging element breakage during the pultrusion molding process.
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 solution ensures rapid biodegradation of the molded fastener, prevents breakage of hook engaging elements during production, maintains high engaging force, and reduces environmental impact, making it suitable for applications in agriculture, forestry, and construction.
Implementation Method 1
a molded hook surface fastener... which is rapidly decomposed in a natural environment after being discarded
Implementation Method 2
a molten resin is caused to flow on the surface of a die in the form of a sheet, the molten resin is pressed into a hook-shaped cavity
Data Source
AI summary
A molded hook surface fastener having a base plate and hook engaging elements projecting from a surface of the base plate, both the base plate and the hook engaging elements being formed of a resin mixture containing polybutylene succinate (A), a modified starch having an amylose content of 45% by weight or more (B), and polyvinyl alcohol (C). The resin mixture is further characterized by having both a continuous phase and a dispersed phase, with the polybutylene succinate (A) present in the continuous phase, and the modified starch (B) and polyvinyl alcohol (C) present in the dispersed phase.