Aqueous Pressure-Sensitive Adhesive Composition for Wire Harnesses
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Solution Overview
Problem
Rubber-based aqueous pressure-sensitive adhesives face challenges with mechanical stability and insulating characteristics, particularly when used in electrical insulation applications, due to poor performance under mechanical shear and insufficient moisture-proof adhesive strength.
Innovation Solution
An aqueous pressure-sensitive adhesive composition comprising rubber-based latex and a tackifier resin emulsion, where the tackifier resin emulsion is emulsified with an ammonium salt of rosins and a water-soluble salt of casein as a protective colloid, enhancing mechanical stability and insulating characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If rubber-based aqueous pressure-sensitive adhesive is used to substitute solvent type pressure-sensitive adhesive, then environmental protection and safety are improved, but mechanical stability and insulating characteristics deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the aqueous pressure-sensitive adhesive by incorporating specific resins (polyester resin, polyurethane resin, or acrylic resin) with controlled molecular structures and molecular weights. This modification transforms the original rubber-based latex into a composite system that maintains aqueous formulation benefits while achieving solvent-type performance levels in mechanical stability and electrical insulation.
Solution Approach 2:
The patent creates a composite pressure-sensitive adhesive system by combining rubber-based latex with additional resin components (polyester resin, polyurethane resin, or acrylic resin). This composite approach allows the aqueous formulation to achieve properties comparable to solvent-based adhesives, particularly in mechanical stability under shear stress and insulating characteristics, while maintaining environmental advantages.
2Stability of the object's composition
If aqueous pressure-sensitive adhesive contains water-soluble ionic emulsifier in large quantities, then emulsion stability is improved, but insulating characteristics deteriorate
Solution Approach 1:
The patent modifies the emulsifier system by controlling the quantity of water-soluble ionic emulsifier and introducing nonionic emulsifiers. This parameter change reduces the ionic content that compromises insulation while maintaining adequate emulsion stability through the combined action of different emulsifier types with complementary properties.
Solution Approach 2:
The patent introduces nonionic emulsifiers as intermediary substances that mediate between the need for emulsion stability and the requirement for good insulating characteristics. These nonionic emulsifiers provide steric stabilization without the ionic conductivity issues, acting as a bridge to achieve both goals simultaneously.
3Stability of the object's composition
If conventional tackifier resin emulsion is used, then mechanical stability is improved to some degree, but moisture-proof adhesive strength deteriorates
Solution Approach 1:
The patent creates a composite tackifier system by combining conventional tackifier resin emulsion with additional resin components (polyester resin, polyurethane resin, or acrylic resin). This composite approach enhances moisture resistance while maintaining mechanical stability, as the additional resins provide hydrophobic characteristics that protect adhesive bonds in humid environments.
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 achieves improved mechanical stability and moisture-proof adhesive strength, making it suitable for applications like protecting or binding wire harnesses, particularly in automotive use.
Implementation Method 1
a tackifier resin emulsion obtained by emulsifying a tackifier resin in the presence of an emulsifier containing an ammonium salt of rosins
Implementation Method 2
stability of the emulsion, particularly, stability for mechanical shear is emphasized for one of performance requirements
Implementation Method 3
electrical insulation properties are required; however, rubber-based aqueous pressure-sensitive adhesives are insufficient in insulating characteristics
Implementation Method 4
moisture-proof adhesive strength under humidification
Data Source
AI summary
An aqueous pressure-sensitive adhesive composition of the invention comprises a rubber-based latex and a tackifier resin emulsion, wherein the tackifier resin emulsion is that obtained by emulsifying a tackifier resin in the presence of an emulsifier containing an ammonium salt of rosins; and the aqueous pressure-sensitive adhesive composition contains a water-soluble salt of casein as protective colloid. The aqueous pressure-sensitive adhesive composition is excellent in mechanical stability and insulating characteristics and has good moisture-proof adhesive strength.