Aqueous dipping composition
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Solution Overview
Problem
Existing dipping compositions for textile reinforcing materials in elastomeric articles, particularly in motor vehicle tires, face challenges in achieving adequate bonding between the reinforcing members and the elastomeric compound, especially under mechanical stress, while also requiring improved storage stability and ease of handling, and often rely on harmful resorcinol-formaldehyde latex systems.
Innovation Solution
An aqueous dipping composition comprising 4.5% to 25% rubber latex, 0.1% to 10% blocked isocyanate, 0.02% to 20% filler, and 0% to 6% epoxy group-containing compound, with a weight ratio of rubber latex to blocked isocyanate, epoxy group-containing compound, and polymer with carboxylic acid functional groups of at least 2, which is free of resorcinol, resorcinol precondensates, and formaldehyde-releasing substances, enhancing bonding and storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If resorcinol-formaldehyde latex (RFL) containing dipping compositions are used for coating textile reinforcing material, then bonding between strengthening member and elastomeric compound is improved, but harmful substances (resorcinol and formaldehyde) are introduced
Solution Approach 1:
The patent removes the harmful resorcinol and formaldehyde components from the dipping composition while retaining the essential bonding functionality through alternative safe chemicals and mechanisms
Solution Approach 2:
The patent converts the previously harmful RFL system into a beneficial RF-free system by using alternative chemicals that provide the same bonding activation without the harmful effects, turning a harmful approach into a safe one
2Object-affected harmful factors
If RF-free dipping compositions are used to eliminate harmful substances, then health and environmental safety is improved, but storage stability of treated textile reinforcing material deteriorates
Solution Approach 1:
The patent optimizes the ratios and concentrations of alternative chemicals (rubber latex, blocked isocyanate, epoxy compounds, carboxylic acid polymers) to achieve both safety and storage stability, adjusting chemical parameters to resolve the contradiction
3Reliability
If traditional RFL dipping compositions are used for activation, then bonding activation is achieved, but handling and processing difficulty increases due to harmful substance requirements
Solution Approach 1:
The patent transforms the handling burden of harmful RFL chemicals into the advantage of using safe, easily handled alternative chemicals that provide equivalent bonding activation without the operational difficulties associated with hazardous materials
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 the textile reinforcing material and elastomeric compound, enhanced storage stability, and ease of handling, while avoiding the use of harmful substances, leading to better processing and performance in elastomeric articles.
Implementation Method 1
The activation of the strengthening members prior to rubberization for adequate bonding
Implementation Method 2
0% to 6% by weight (dry weight) of at least one epoxy group-containing compound, and 0% to 15% by weight (dry weight) of at least one polymer with carboxylic acid functional groups
Implementation Method 3
4% to 50% by weight (dry weight) of at least one rubber latex
Implementation Method 4
bonding between the strengthening member and the surrounding elastomeric compound
Data Source
AI summary
The present invention relates to an aqueous dipping composition for coating a textile reinforcing material, comprising at least one rubber latex, at least one blocked isocyanate, at least one filler, at least one epoxy group-containing compound, and at least one polymer with carboxylic acid functional groups. 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.