Textile-Rubber Composite Coating for Aramid Adhesion
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Solution Overview
Problem
Existing methods for producing composite articles with textile layers and rubber layers face challenges in achieving strong adhesion, particularly with low surface energy substrates like aramid fibers, and often require hazardous chemicals or costly environmental mitigation measures.
Innovation Solution
The use of polymeric coatings formed by polymerizing specific precursors with sub-formula (I) on the textile layer faces, which are hydrophobic and capable of activating double bonds for polymerization, allowing for effective adhesion to both low and high surface energy materials, including aramid fibers, with minimal solvent use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If silane or RFL adhesion promoters are used to pretreat the textile layer, then adhesion strength between textile and rubber is improved, but environmental hazards and manufacturing complexity increase
Solution Approach 1:
The patent introduces a silane-free adhesion promoter as an intermediary substance between the textile layer and rubber layer. This promoter contains specific functional groups that enable strong bonding to both substrates without requiring hazardous silane chemicals or RFL treatments, thus maintaining adhesion strength while eliminating environmental hazards
Solution Approach 2:
The invention changes the chemical parameters of the adhesion promoter by using alternative compounds that do not contain silane or RFL. The promoter is applied at controlled concentrations and under specific processing conditions to achieve optimal adhesion without the harmful effects of traditional chemicals
2Strength
If silane or RFL adhesion promoters are used to pretreat the textile layer, then adhesion strength between textile and rubber is improved, but manufacturing cost and process complexity increase
Solution Approach 1:
The silane-free adhesion promoter serves as a simplified intermediary that eliminates the need for complex filtering equipment and multiple processing steps. The promoter can be applied directly to the textile layer in a single coating operation, reducing manufacturing complexity while maintaining adhesion performance
Solution Approach 2:
The invention extracts and removes the hazardous silane and RFL components from the adhesion promotion process. By eliminating these complex chemical systems and their associated handling, storage, and filtration requirements, the manufacturing process becomes simpler and more cost-effective
3Reliability
If aramid textile layers are used to withstand higher temperatures and load forces, then composite article performance is improved, but adhesion difficulty increases
Solution Approach 1:
The silane-free adhesion promoter acts as a specialized intermediary designed to bond to the low-surface-energy aramid fibers. The promoter contains functional groups that are compatible with aramid chemistry, enabling strong adhesion to this high-performance textile while allowing the aramid to maintain its temperature and load resistance properties
Solution Approach 2:
The invention applies local quality by using a specifically formulated adhesion promoter that targets the unique surface properties of aramid fibers. The promoter is applied only to the textile layer surface where adhesion is needed, providing localized bonding enhancement without affecting the bulk properties of the aramid or requiring changes to the rubber formulation
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
This approach enables excellent adhesion between textile layers and polymeric layers, facilitating the production of high-performance composite articles like hoses and belts with improved strength and environmental sustainability.
Implementation Method 1
the polymeric coatings on the first and second faces of the textile layer are each formed by polymerising a polymeric precursor which includes a group of sub-formula (I)
Data Source
AI summary
According to the invention there is provided a composite article including: a textile layer having a first and a second face, each of the first and second faces having a polymeric coating thereon; a first polymeric layer adhered to the polymeric coating on the first face of the textile layer; and a second polymeric layer adhered to the polymeric coating on the second face of the textile layer; in which the polymeric coatings on the first and second faces of the textile layer are each formed by polymerising a polymeric precursor which includes a group of sub-formula (I) where R2 and R3 are independently selected from (CR7R8)n, or a group CR9R10, CR7R8CR9R10 or CR9R10CR7R8 where n is 0, 1 or 2, R7 and R8 are independently selected from hydrogen, halo or hydrocarbyl, and either One of R9 or R10 is hydrogen and the other is an electron withdrawing group, or R9 and R10 together form an electron withdrawing group, and R4 and R5 are independently selected from CH or CR11 where R11 is an electron withdrawing group, the dotted lines indicate the presence or absence of a bond, X1 is a group CX2X3 where the dotted line bond to which it is attached is absent and a group CX2 where the dotted line bond to which it is attached is present, Y1 is a group CY2Y3 where the dotted line bond to which it is attached is absent and a group CY2 where the dotted line bond to which it is attached is present, and X2, X3, Y2 and Y3 are independently selected from hydrogen, fluorine or other substituents, R1 is selected from hydrogen, halo, nitro, hydrocarbyl, optionally substituted or interposed with functional groups, or formula (II), and R13 is C(0) or S(0)2.