Automobile Interior Parts with Reduced Squeaking Noises
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Automobile interior parts made of ABS resin often generate squeaking noises due to friction, which compromises comfort and silence during car rides, and existing solutions fail to effectively reduce these noises while maintaining durability, especially under high temperatures.
Innovation Solution
Incorporating a specific amount of silicone oil with kinematic viscosity between 10 to 100,000 cSt into a rubber-modified vinyl resin composition, specifically with a diene rubber polymer and ethylene-α-olefin rubber polymer, to reduce friction and squeaking noises, while maintaining impact resistance and appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ABS resin is used for automobile interior parts, then mechanical properties and moldability are improved, but squeaking noises are generated due to high coefficient of friction
Solution Approach 1:
The invention changes the chemical composition parameters of the resin by incorporating specific rubber polymers (diene rubber and ethylene-α-olefin rubber) in controlled amounts (5-30% total) into the ABS resin matrix. This compositional parameter change reduces the coefficient of friction and eliminates the stick-slip phenomenon that causes squeaking noises, while preserving the mechanical strength and moldability of ABS resin.
Solution Approach 2:
The invention creates a composite material system by combining ABS resin with rubber-modified vinyl resin containing specific rubber polymers. This composite structure leverages the mechanical properties of ABS resin while the rubber components reduce friction and prevent squeaking noises through their viscoelastic properties and lower friction coefficient.
2Object-generated harmful factors
If silicone oil is incorporated into ABS resin to reduce squeaking noises, then friction is reduced, but the effect deteriorates under high temperatures
Solution Approach 1:
The invention replaces the temporary silicone oil coating with rubber polymers that are permanently integrated into the resin matrix through molding. This eliminates the need for separate coating applications and ensures the friction-reducing effect is built-in and durable, particularly under high-temperature conditions where silicone oil would deteriorate.
Solution Approach 2:
The friction-reducing rubber polymers are incorporated into the resin during the molding process itself, rather than applying coatings afterward. This preliminary incorporation ensures the friction-modifying components are uniformly distributed and permanently bonded within the material structure, providing long-lasting effectiveness under various temperature conditions.
3Object-generated harmful factors
If Teflon coating or silicone oil application is used to prevent squeaking noises, then friction is reduced, but the process becomes complicated and time-consuming
Solution Approach 1:
The invention merges the friction-reducing function with the base resin material by incorporating rubber polymers directly into the ABS resin formulation. This integration eliminates the need for separate coating or oil application processes, simplifying the manufacturing workflow to a single molding operation while maintaining effective squeaking noise prevention.
Solution Approach 2:
The resin composition itself provides the friction-reducing properties through the incorporated rubber polymers, making the material self-sufficient for noise prevention. This eliminates the need for external coatings or additional treatment steps, as the anti-squeak functionality is an inherent property of the molded part material.
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 significantly reduces squeaking noises and maintains effectiveness even at high temperatures, enhancing impact resistance and molded appearance of automobile interior parts.
Implementation Method 1
a method of incorporating a silicone oil into an ABS resin and a method of incorporating an epoxy-containing olefin copolymer into an ABS resin have been proposed
Data Source
AI summary
An automobile interior part made of a thermoplastic resin composition [D] prepared by incorporating 0.1 to 8 parts by mass of a silicone oil [B] having a kinematic viscosity at 25° C. of 10 to 100,000 cSt into 100 parts by mass of a rubber-reinforced vinyl resin [A], wherein [A] contains a diene rubber polymer [a1] and an ethylene-α-olefin rubber polymer [a2 ], the total amount of [a1 ] and [a2 ] is 5 to 30% by mass, and the mass ratio of [a1] to [a2], [a1]: [a2], is 10 to 85 : 90 to 15. The automobile interior part shows remarkably reduced generation of squeaking noises when members rub against each other, and this effect is maintained without deterioration even when being placed under high temperatures for a long time. The automobile interior part is also superior in impact resistance and molded appearance.