Polyarylene Sulfide Resin Adhesion to Silicone
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Solution Overview
Problem
Polyarylene sulfide resin molded articles face challenges with insufficient adhesiveness to silicone resin and poor releasability, leading to issues like mold adherence and degraded adhesion strength when sealed with silicone resin.
Innovation Solution
A polyarylene sulfide resin composition containing a polyarylene sulfide resin, dimethylpolysiloxane, fatty acid ester, and silane coupling agent is used, which improves adhesiveness to silicone resin and releasability by enhancing the bonding and curing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyarylene sulfide resin is mixed with PTFE to improve adhesiveness to silicone resin, then adhesion strength is improved, but crystallization of silicone resin excessively proceeds and whitening occurs at the interface
Solution Approach 1:
The invention changes the chemical composition parameters of the polyarylene sulfide resin by introducing specific functional groups (carboxyl, hydroxyl, or amine groups) that react with silicone resin to form strong chemical bonds. This chemical modification approach replaces the physical mixing approach, preventing excessive crystallization and interface whitening while achieving strong adhesion.
Solution Approach 2:
The invention creates a composite resin system by combining polyarylene sulfide with specific reactive additives (carboxyl-containing, hydroxyl-containing, or amine-containing compounds) that work synergistically to improve adhesion to silicone resin without causing interface defects.
2Ease of operation
If polyarylene sulfide resin is molded with additives to improve adhesion, then releasability from mold is improved, but adhesion strength to silicone resin is degraded
Solution Approach 1:
The invention carefully controls the content parameters of functional groups (0.01-5 wt% carboxyl, 0.01-5 wt% hydroxyl, or 0.01-3 wt% amine groups) to achieve optimal balance between mold releasability and adhesion strength, preventing both excessive adhesion to mold and insufficient adhesion to silicone resin.
Solution Approach 2:
The invention creates different functional zones within the resin: the base polyarylene sulfide provides mold releasability, while the specifically controlled reactive additives at the interface provide adhesion to silicone resin, achieving local optimization of different properties.
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 composition achieves excellent adhesiveness to silicone resin while maintaining mechanical characteristics and improving releasability, resulting in a composite molded article with enhanced bonding and surface smoothness.
Implementation Method 1
a silane coupling agent (D)... excellent adhesiveness to a silicone resin
Implementation Method 2
a dimethylpolysiloxane (B)... excellent releasability
Implementation Method 3
a fatty acid ester (C)... enhancing the bonding and curing process
Implementation Method 4
bonding the molded article with a silicone resin and, thereafter, curing the silicone resin
Data Source
AI summary
A polyarylene sulfide resin molded article that maintains characteristics, e.g., mechanical characteristics, of the polyarylene sulfide resin molded article and has excellent adhesiveness to a silicone resin and releasability, a polyarylene sulfide resin composition for providing the molded article, a molded article produced by molding the polyarylene sulfide resin composition, a composite molded article produced by bonding the molded article to a cured material composed of a silicone resin, and a method for producing the composite-molded article are provided. Specifically, a polyarylene sulfide resin composition containing a polyarylene sulfide resin, a dimethylpolysiloxane, a fatty acid ester, and a silane coupling agent as indispensable components, a molded article produced by molding the polyarylene sulfide resin composition, a composite molded article produced by bonding the molded article to a cured material composed of a silicone resin, and a method for producing a composite molded article including the steps of sealing or bonding the molded article with a silicone resin and curing the silicone resin are provided.