Polyphenylene Sulfide Resin Composition with Silane-Modified Polyethylene Mediator
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Solution Overview
Problem
Polyphenylene sulfide resin compositions face challenges in achieving both high heat resistance and reduced outgassing while maintaining flowability and mechanical properties, particularly in applications requiring surface smoothness and rigidity, such as automotive and electronic components, where existing solutions fail to provide sufficient adhesiveness and filler distribution.
Innovation Solution
A polyphenylene sulfide resin composition is developed by blending two polyphenylene sulfide resins with specific weight loss percentages and molecular weights, along with the addition of fibrous and non-fibrous fillers and functional group-containing olefin copolymers, to enhance heat resistance, flowability, and surface smoothness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an inorganic filler is mixed with PPS resin to improve heat resistance and rigidity, then heat resistance and rigidity are improved, but melt viscosity increases significantly causing increased outgas amount and deteriorated molding processability
Solution Approach 1:
The patent introduces a specific silane-modified polyethylene resin as an intermediary material between the PPS resin and inorganic filler. This intermediary resin has silane groups that react with the inorganic filler surface, creating a bridging effect that improves filler dispersion and adhesion while maintaining lower melt viscosity compared to direct filler mixing, thereby reducing outgas amount during molding
Solution Approach 2:
The patent changes the chemical parameters of the polyethylene resin by introducing silane modification, which alters its reactivity and compatibility with inorganic filler. This parameter change enables the resin to function as an effective coupling agent, improving the overall composite properties without significantly increasing melt viscosity
2Strength
If an inorganic filler is mixed with PPS resin to improve heat resistance and rigidity, then heat resistance and rigidity are improved, but molding processability deteriorates due to increased melt viscosity
Solution Approach 1:
The silane-modified polyethylene resin acts as a mediator that facilitates better interaction between the PPS matrix and inorganic filler. The silane groups on the polyethylene resin bond to the filler surface, creating a more compatible interface that allows for easier processing while maintaining enhanced rigidity
Solution Approach 2:
The patent creates a multi-component composite material system consisting of PPS resin, silane-modified polyethylene resin, and inorganic filler. This composite structure leverages the complementary properties of each component to achieve both improved rigidity and maintained molding processability
3Strength
If conventional techniques mix inorganic filler with PPS resin, then rigidity is improved, but adhesiveness with filler is insufficient causing uneven filler distribution and increased surface irregularities
Solution Approach 1:
The silane-modified polyethylene resin serves as a coupling intermediary that chemically bonds to the inorganic filler surface through silane groups. This creates strong adhesion between the filler and PPS matrix, ensuring uniform filler distribution and smooth molded product surfaces without requiring secondary processing
Solution Approach 2:
The patent applies local quality modification by introducing silane modification specifically at the interface between the polyethylene resin and inorganic filler. This localized chemical modification enhances adhesion precisely where needed at the filler-matrix interface, improving surface quality and filler distribution
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 heat resistance, reduced outgassing, and improved adhesiveness with fillers, resulting in high rigidity and surface smoothness, suitable for various components, including automotive lighting and plumbing applications, while maintaining toughness and processability.
Implementation Method 1
a first polyphenylene sulfide resin having a weight loss percentage ΔWr of not greater than 0.18% under heating
Data Source
AI summary
There is provided a polyphenylene sulfide resin composition, comprising 5 to 95% by weight of a component (B) which is a polyphenylene sulfide resin having a weight-average molecular weight of not less than 10,000 and a weight loss percentage ΔWr of not greater than 0.18% under heating, relative to 95 to 5% by weight of a component (A) which is a polyphenylene sulfide resin having the weight loss percentage ΔWr of greater than 0.18%, wherein a total of the component (A) and the component (B) is equal to 100% by weight.