Transmission Oil Hose Rubber Composition for Single-Stage Crosslinking
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Solution Overview
Problem
The existing rubber compositions for transmission oil cooler hoses require two-stage crosslinking, which is costly and time-consuming, resulting in cured products with inadequate hardness and elongation, affecting caulking sealability when joining with metal pipes.
Innovation Solution
A rubber composition comprising a ternary copolymer of ethylene, (meth)acrylic acid ester, and a carboxyl group-containing monomer, hexamethylenediamine carbamate, diazabicycloundecene, carbon black, and a plasticizer, crosslinked only through primary crosslinking, achieving desired hardness and elongation levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two-stage crosslinking is performed to achieve desired rubber properties, then heat resistance and oil resistance are improved, but production cost and time increase
Solution Approach 1:
The invention extracts and eliminates the secondary crosslinking step from the traditional two-stage process. By using a specifically designed crosslinking agent system, the patent achieves the desired crosslinking density and property development in a single stage, removing the unnecessary secondary treatment step while maintaining heat and oil resistance
Solution Approach 2:
The invention changes the chemical parameters of the crosslinking system by introducing a specific crosslinking agent composition and controlling the crosslinking reaction conditions. This parameter optimization allows the crosslinking reaction to proceed to completion in one stage, achieving the same or better properties than two-stage crosslinking but in reduced time
2Reliability
If two-stage crosslinking is performed to achieve desired rubber properties, then heat resistance and oil resistance are improved, but manufacturing cost increases
Solution Approach 1:
The invention extracts and eliminates the secondary crosslinking step from the traditional two-stage process. By using a specifically designed crosslinking agent system, the patent achieves the desired crosslinking density and property development in a single stage, removing the unnecessary secondary treatment step while maintaining heat and oil resistance
Solution Approach 2:
The invention employs a crosslinking agent system that is optimized for single-use efficiency. The crosslinking agents and catalysts are formulated to complete the crosslinking reaction in one stage without requiring additional processing steps, reducing overall manufacturing cost despite the higher initial material cost
3Productivity
If primary crosslinking alone is performed to reduce production time, then manufacturing efficiency is improved, but hardness and elongation properties deteriorate
Solution Approach 1:
The invention changes the chemical parameters of the crosslinking system by introducing a specific crosslinking agent composition and controlling the crosslinking reaction conditions. This parameter optimization allows the crosslinking reaction to proceed to completion in one stage, achieving the same or better properties than two-stage crosslinking but in reduced time
Solution Approach 2:
The invention uses a composite crosslinking system comprising multiple crosslinking agents and catalysts working together. This composite approach enables complete crosslinking in a single stage, achieving the desired hardness and elongation properties that would otherwise require sequential two-stage processing
4Productivity
If primary crosslinking alone is performed to reduce production time, then manufacturing efficiency is improved, but caulking sealability deteriorates
Solution Approach 1:
The invention changes the chemical parameters of the crosslinking system by introducing a specific crosslinking agent composition and controlling the crosslinking reaction conditions. This parameter optimization allows the crosslinking reaction to proceed to completion in one stage, achieving the same or better properties than two-stage crosslinking but in reduced time
Solution Approach 2:
The invention uses a composite crosslinking system comprising multiple crosslinking agents and catalysts working together. This composite approach enables complete crosslinking in a single stage, achieving the desired hardness and elongation properties that would otherwise require sequential two-stage processing
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 rubber composition achieves excellent hardness and elongation at break through single-stage crosslinking, improving caulking sealability and reducing production costs and time.
Implementation Method 1
two amino groups of hexamethylene diamine react with carboxyl groups of the AEM polymer represented by Formula (I) intermolecularly or intramolecularly to form two amide bonds and water
Implementation Method 2
each of the two amide bonds further reacts with another carboxyl group in the AEM polymer to form two imide bonds and water
Data Source
AI summary
An object of the present invention is to provide a rubber composition for hoses that can be a cured product having excellent hardness and elongation at break through only primary crosslinking. The present invention is a rubber composition for hoses including a ternary copolymer including each constituent unit of ethylene, a (meth)acrylic acid ester, and a carboxyl group-containing monomer including a carboxyl group, hexamethylenediamine carbamate, diazabicycloundecene, carbon black, and a plasticizer, the rubber composition having a content of the carbon black of from 77 to 87 parts by mass per 100 parts by mass of the ternary copolymer, a transmission oil pipe for automobiles formed by using the rubber composition for hoses, and a method for producing the same.