Polyacetal Resin Composition Adhesion to Polyethylene
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Solution Overview
Problem
The existing polyacetal resin compositions exhibit insufficient adhesive properties when used with polyacetal and polyethylene resin moldings, leading to potential fuel leakage from interfaces, which is a concern due to the volatility of fuel and its environmental impact.
Innovation Solution
A polyacetal resin composition is developed with a specific blend of polyacetal and modified polyethylene resins, where the polyacetal resin has a melt flow rate of 30 g/10 minutes or less and the polyethylene resin has a modification rate of 0.01% or more, with a melt flow rate of 2.5 g/10 minutes or less, enhancing the adhesive properties between polyacetal and polyethylene resin moldings through an intermediate layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polyacetal resin composition is used to connect polyacetal and polyethylene resin moldings, then the mechanical strength and chemical resistance are improved, but the adhesive property at the interface is insufficient causing separation and fuel leakage
Solution Approach 1:
The patent applies parameter changes by precisely controlling the melt flow rate of the polyacetal resin to 30 g/10 minutes or less and the polyethylene resin to 2.5 g/10 minutes or less. These specific parameter ranges optimize the adhesive properties at the interface between different resin moldings, preventing separation and fuel leakage while maintaining the mechanical strength and chemical resistance of the polyacetal resin composition.
Solution Approach 2:
The patent employs composite materials by creating a resin composition that blends polyacetal resin with specific additives including maleic anhydride-grafted polyethylene resin (0.1-10 parts by mass per 100 parts polyacetal resin) and peroxide (0.1-5 parts by mass). This composite formulation enhances the adhesive property at the interface between polyacetal and polyethylene resin moldings, solving the separation issue while maintaining the beneficial properties of the base polyacetal resin.
2Ease of manufacture
If the melt flow rate of polyacetal resin is increased to improve processability, then the manufacturing ease is improved, but the adhesive property with polyethylene resin molding deteriorates
Solution Approach 1:
The patent establishes an optimal parameter range by limiting the melt flow rate of polyacetal resin to 30 g/10 minutes or less. This parameter control ensures sufficient adhesive property with polyethylene resin moldings while still allowing for acceptable processability. The balance is achieved through this specific upper limit on melt flow rate, preventing both excessive separation and manufacturing difficulties.
Solution Approach 2:
The patent applies local quality by adding maleic anhydride-grafted polyethylene resin specifically at the interface region where adhesion is needed. This localized modification through the grafting agent concentrates adhesive properties at the critical interface between polyacetal and polyethylene moldings, while the bulk polyacetal resin maintains its original processability characteristics.
3Reliability
If the modification rate of polyethylene resin is increased to enhance adhesion, then the adhesive property is improved, but the cost and complexity of material preparation increase
Solution Approach 1:
The patent optimizes the modification rate parameter by specifying maleic anhydride-grafted polyethylene resin with a grafting rate of 1-10 mass%. This parameter range achieves sufficient adhesive property enhancement while controlling material preparation complexity. The specific range balances adhesion improvement against the complexity of obtaining and processing the modified resin.
Solution Approach 2:
The patent uses maleic anhydride-grafted polyethylene resin as an intermediary material that facilitates adhesion between polyacetal and polyethylene moldings. This intermediary contains functional groups that can interact with both resin types, improving adhesive property without requiring complex multi-step modification processes on the final assembly.
4Ease of manufacture
If welding is used to connect polyacetal and polyethylene resin parts, then the manufacturing process is simplified, but the welding property of the interface is low causing easy separation
Solution Approach 1:
The patent introduces a resin composition containing maleic anhydride-grafted polyethylene resin as an intermediary material that improves welding properties at the interface between polyacetal and polyethylene moldings. This intermediary enhances the welding property without complicating the manufacturing process, as it can be applied during the existing molding or welding operation.
Solution Approach 2:
The patent modifies the welding interface by controlling the composition parameters, specifically adding 0.1-10 parts by mass of maleic anhydride-grafted polyethylene resin per 100 parts polyacetal resin. This parameter change improves the welding property at the interface, preventing easy separation while maintaining the simplicity of the overall manufacturing process.
Data Source
AI summary
The invention is a polyacetal resin composition containing a polyacetal resin (A) and a polyethylene resin (B), in which the blending proportion of the polyacetal resin (A) occupying in the total mass of the polyacetal resin (A) and the polyethylene resin (B) is 10 to 90 mass %, the melt flow rate of the polyacetal resin (A) measured at a condition of 190° C. and 2.16 kg load is 30 g/10 minutes or less, and the polyethylene resin (B) consists of a modified polyethylene resin and the modification rate is 0.01 mass % or more based on 100 mass % of the total mass of the polyethylene resin and the melt flow rate of the polyethylene resin (B) measured at a condition of 190° C. and 2.16 kg load is 2.5 g/10 minutes or less.