Thermoplastic Resin Composition for Reducing Squeaking Noises
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Solution Overview
Problem
Styrene resins, commonly used in automotive and household applications, generate squeaking noises when parts rub against each other due to their high coefficient of friction, leading to discomfort and noise issues, and existing solutions like Teflon coating or silicone oil application have limited durability and effectiveness, especially under high temperatures.
Innovation Solution
A thermoplastic resin composition containing a rubber-reinforced vinyl resin with a specific ethylene-α-olefin rubber polymer and controlled silicon content, which reduces squeaking noises by modifying the friction properties without deteriorating over time, even at high temperatures, and enhances impact resistance and molded appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If styrene resins are used for their superior moldability and mechanical properties, then manufacturing ease is improved, but squeaking noises are generated due to high coefficient of friction
Solution Approach 1:
The patent changes the chemical composition parameters of the styrene resin by incorporating specific rubber polymers (polybutadiene, polyisoprene, or chloroprene rubber) at controlled amounts (5-50 parts by weight per 100 parts of styrene resin). This compositional parameter change modifies the friction characteristics to reduce squeaking noises while preserving the moldability and mechanical properties of the base styrene resin.
Solution Approach 2:
The patent creates a composite material system by combining styrene resin with rubber polymer components. The composite consists of the base styrene resin matrix reinforced with rubber polymers that have specific glass transition temperatures and molecular weights. This composite structure provides both the moldability of styrene resin and the low-friction properties of rubber, resolving the contradiction between ease of manufacture and noise generation.
2Object-generated harmful factors
If Teflon coating or silicone oil application is used to reduce friction, then squeaking noises are reduced, but durability deteriorates under high temperatures
Solution Approach 1:
The patent implements self-service by incorporating the friction-modifying rubber polymer components directly into the resin composition during manufacturing. The rubber polymers with specific glass transition temperatures (below -50°C for polybutadiene, below -70°C for polyisoprene, or below -40°C for chloroprene rubber) provide inherent low-friction properties that are permanently integrated into the material structure, eliminating the need for separate coating or lubrication applications and ensuring long-term durability under high temperature conditions.
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 significantly reduces squeaking noises when parts made of styrene resins come into contact, maintaining effectiveness under prolonged high-temperature exposure and providing excellent impact resistance and appearance.
Implementation Method 1
an ethylene-α-olefin rubber polymer [a1] having Tm (melting point) of 0° C. or higher
Data Source
AI summary
Provided is a thermoplastic resin composition [X] for reduction of squeaking noises containing a rubber-reinforced vinyl resin [A] obtained by polymerizing a vinyl monomer [b1] in the presence of an ethylene-α-olefin rubber polymer [a1] having Tm (melting point) of 0° C. or higher, wherein an amount of silicon contained in the thermoplastic resin composition [X] is 0.15% by mass or less based on 100% by mass of the thermoplastic resin composition [X]. According to the present invention, a structure can be provided, which is characterized in that squeaking noises that are generated when members rub against each other is remarkably reduced, that an effect of reducing squeaking noises is maintained without deterioration even when placed under high temperature for a long time, and that impact resistance and molded appearance are superior.