Aqueous Dipping Composition for RF-Free Textile Rubber Bonding
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Solution Overview
Problem
Existing dipping compositions for textile reinforcing materials in elastomeric articles, such as tires, often rely on resorcinol-formaldehyde latex, which are harmful to the environment and health, and lack adequate storage stability and handling ease.
Innovation Solution
An aqueous dipping composition comprising 4% to 50% rubber latex, 0.1% to 10% blocked isocyanate, 0.3% to 30% wax, and 0% to 15% polymer with carboxylic acid functional groups, with a weight ratio of rubber latex to blocked isocyanate, epoxy group-containing compound, and polymer favoring at least 2, is used to enhance bonding and storage stability while avoiding resorcinol, formaldehyde, and formaldehyde-releasing substances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If resorcinol-formaldehyde latex dipping compositions are used to activate strengthening members, then bonding between strengthening member and elastomeric compound is improved, but environmental and health harm increases
Solution Approach 1:
The patent removes harmful resorcinol and formaldehyde components from the dipping composition while retaining the essential bonding functionality through alternative safe chemicals, directly extracting the harmful elements from the system
Solution Approach 2:
The patent converts the challenge of eliminating harmful substances into a benefit by developing a formulation that uses safe, environmentally friendly ingredients (aqueous latex, blocked isocyanate, epoxy compounds, waxes, carboxylic acid polymers) that actually improve bonding performance while eliminating health and environmental risks
2Object-affected harmful factors
If RF-free dipping compositions are used to eliminate harmful substances, then environmental and health safety is improved, but storage stability deteriorates
Solution Approach 1:
The patent modifies the chemical parameters of the dipping composition by using blocked isocyanates (which are stable at storage conditions) and controlling the pH and composition ratios, thereby achieving both safety and storage stability
Solution Approach 2:
The patent creates a composite dipping composition combining multiple stable components (aqueous latex, blocked isocyanate, epoxy compounds, waxes, and carboxylic acid polymers) that work synergistically to provide both environmental safety and improved storage stability
3Strength
If traditional dipping compositions are used to achieve bonding activation, then bonding between strengthening member and elastomeric compound is improved, but ease of handling and processing deteriorates
Solution Approach 1:
The patent changes the physical and chemical parameters of the dipping composition by formulating it as an aqueous-based system with controlled viscosity through wax and polymer additives, making it easier to handle, apply, and process while maintaining bonding effectiveness
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 provides improved bonding between textile reinforcing materials and elastomeric compounds, enhanced storage stability, and ease of handling, making it suitable for various textile reinforcing materials and industrial applications.
Implementation Method 1
the strengthening member and the elastomeric compound normally have different strengths. Especially under ongoing mechanical and dynamic stress, as in driving operation of a motor vehicle tyre, adequate bonding between the strengthening member and the surrounding elastomeric compound is therefore necessary.
Implementation Method 2
0% to 6% by dry weight of at least one epoxy group-containing compound
Implementation Method 3
0% to 15% by dry weight of at least one polymer with carboxylic acid functional groups
Implementation Method 4
4% to 50% by dry weight of at least one rubber latex
Implementation Method 5
0.3% to 30% by dry weight of at least one wax
Data Source
AI summary
The present invention relates to an aqueous dipping composition for coating a textile reinforcing material, comprising 4% to 50% by dry weight of at least one rubber latex,0.1% to 10% by dry weight of at least one blocked isocyanate, 0.3% to 30% by dry weight of at least one wax, 0% to 6% by dry weight of at least one epoxy group-containing compound, and 0% to 15% by dry weight of at least one polymer with carboxylic acid functional groups, wherein the amounts in % by dry weight are based on the total weight of the aqueous dipping composition, wherein the weight ratio of rubber latex to the sum of blocked isocyanate, epoxy group-containing compound and polymer with carboxylic acid functional groups is at least 2, and wherein the composition is essentially free of resorcinol, resorcinol precondensates, formaldehyde and formaldehyde-releasing substances. The present invention further relates to the use of such a composition, to a process for coating a textile reinforcing material with this composition, to a coated textile reinforcing material and a respective elastomeric article comprising the coated textile reinforcing material.