Sulfur-Linkable Rubber Mixture Reducing Heat Build-Up
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Solution Overview
Problem
Rubber mixtures containing hexamethoxymethylmelamine (HMMM) and/or hexamethylenetetramine (HMT) with methylene acceptor reactants lead to increased heat build-up during vulcanization, which is disadvantageous in the rubber industry, and traditional alternatives like self-condensing alkylated triazine resins may not effectively eliminate this issue.
Innovation Solution
Developing a rubber mixture that is substantially free of methylene acceptor reactants, using HMMM and/or HMT in combination with 1,3,5,7-tetraazaadamantane or urotropin, and optimizing the dosage of HMMM to 0.3 to 4 phr, which reduces heat build-up while maintaining similar vulcanizate stiffness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If methylene acceptor reactants (such as resorcinol) are used in combination with HMMM and/or HMT, then adhesion function is satisfied, but heat build-up increases
Solution Approach 1:
The invention extracts and removes the methylene acceptor reactant (resorcinol) from the traditional vulcanization system, retaining only the methylene donor (HMMM and/or HMT). This extraction eliminates the harmful heat build-up effect while preserving the essential adhesion function through alternative network formation mechanisms.
Solution Approach 2:
The invention changes the chemical composition parameters of the vulcanization system by eliminating methylene acceptor reactants and optimizing the dosage of HMMM and/or HMT to 0.3 to 4 phr. This parameter change transforms the system from one that forms resin networks (high heat build-up) to one that relies on sulfur crosslinking and self-condensation (reduced heat build-up).
2Object-generated harmful factors
If self-condensing alkylated triazine resins are used without methylene acceptor reactants, then heat build-up is reduced, but adhesion effectiveness is compromised
Solution Approach 1:
The invention changes the chemical identity of the methylene donor from self-condensing alkylated triazine resins to HMMM and/or HMT in non-functionalized form. This parameter change maintains the self-condensation capability (reducing heat build-up) while improving adhesion effectiveness through optimized functionality and crosslinking behavior.
Solution Approach 2:
The invention creates a composite vulcanization system combining HMMM and/or HMT with sulfur crosslinking agents and optional functionalized rubbers. This composite approach achieves both reduced heat build-up (through controlled self-condensation) and maintained adhesion strength (through sulfur network formation).
3Reliability
If resorcinol is used as methylene acceptor reactant, then adhesion function is achieved, but health and environmental safety deteriorates
Solution Approach 1:
The invention extracts and eliminates resorcinol from the vulcanization system, removing the harmful substance entirely. The adhesion function is maintained through alternative mechanisms using HMMM and/or HMT with sulfur crosslinking, achieving both safety and performance goals.
Solution Approach 2:
The invention replaces the harmful but effective resorcinol with safer alternatives (HMMM and/or HMT combinations) that achieve the same adhesion function without the toxicological drawbacks. This substitution prioritizes health and environmental safety while maintaining technical performance.
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 effectively reduces heat build-up in vulcanized rubber products while maintaining comparable stiffness and eliminates the need for harmful resorcinol, improving the safety and environmental impact of the manufacturing process.
Implementation Method 1
it being assumed that the high imino and/or methylol functionality allows these resins to condense themselves and thereby create a network necessary for adhesion
Implementation Method 2
During the vulcanization process, a resin is formed from the methylene donor and the methylene acceptor
Implementation Method 3
hexamethoxymethylmelamine (HMMM) and/or hexamethylenetetramine (HMT) always being used as a methylene donor/formaldehyde donor in combination with a methylene acceptor reactant in the mixtures in order to satisfy the adhesion function. During the vulcanization process, a resin is formed from the methylene donor and the methylene acceptor
Implementation Method 4
In addition to the sulfur network, a second network is formed based on methylene donor and methylene acceptor
Data Source
AI summary
Sulfur-crosslinkable rubber mixture comprises hexamethoxymethylmelamine and/or hexamethylenetetramine, where the rubber mixture is free of methylene acceptor reactants. An independent claim is also included for a vehicle pneumatic tire comprising the above vulcanized rubber mixture.