Thiourea-Modified Acrylic Rubber Composition for Thermal Stability
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Solution Overview
Problem
Existing acrylic rubber compositions are prone to thermal degradation under high temperature environments, such as those exceeding 190°C, which compromises their effectiveness and durability in applications like engine seals and hoses.
Innovation Solution
Incorporating a specific thiourea compound, represented by General Formula (1), into the acrylic rubber composition to prevent thermal degradation by enhancing the rubber's resistance to high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional acrylic rubber compositions are used, then good oil resistance and flexibility are achieved, but thermal degradation occurs under high temperature environments (190°C or more)
Solution Approach 1:
A phenolic compound serving as an antioxidant intermediary is introduced into the acrylic rubber composition. This mediator prevents thermal degradation by scavenging free radicals and inhibiting oxidation reactions that would otherwise damage the rubber polymer chains at high temperatures (190°C or more), thereby protecting the rubber without affecting its oil resistance or flexibility
Solution Approach 2:
The chemical composition parameters of the acrylic rubber are modified by adding specific antioxidants (phenolic compounds) and adjusting the ratio of acrylic ester units. This changes the thermal stability parameter of the rubber, enabling it to resist thermal degradation at high temperatures while maintaining its original oil resistance and flexibility properties
2Duration of action of stationary object
If storage stability is enhanced using conventional additives, then shelf life is improved, but thermal degradation resistance under high temperature (190°C or more) is insufficient
Solution Approach 1:
The invention creates a composite acrylic rubber composition by combining the base acrylic rubber with specific phenolic antioxidants and other complementary additives. This composite formulation provides both long-term storage stability and superior heat resistance, as the antioxidant components work synergistically to prevent degradation during both storage and high-temperature service 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 acrylic rubber composition effectively prevents thermal degradation even at temperatures above 190°C, maintaining mechanical properties and reducing gelation, thereby improving the longevity and performance of cross-linked rubber products.
Implementation Method 1
an acrylic rubber composition prepared by compounding an acrylic rubber with a specific thiourea compound... thermal degradation is effectively prevented even under a high temperature environment (for example, under an environment at 190°C or more)
Data Source
AI summary
An acrylic rubber composition comprising an acrylic rubber and a compound represented by General Formula (1): where R1 to R4 each independently represent a C1 to C30 organic group which may have a substituent, and R5 to R10 each independently represent a hydrogen atom or a C1 to C30 organic group which may have a substituent.