Pressure-Sensitive Adhesive Composition for Heat-Resistant Rough Bonding
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Solution Overview
Problem
Existing pressure-sensitive adhesive (PSA) compositions based on styrene-based block copolymers face challenges in maintaining cohesive strength at high temperatures while preserving good adhesion to rough surfaces and ensuring preservability.
Innovation Solution
A PSA composition comprising a block copolymer of a monovinyl-substituted aromatic compound and a conjugated diene compound, combined with a tackifier resin that includes a natural product-based tackifier resin with a softening point above 80°C and a petroleum-based tackifier resin with an aromatic ring, achieving a balanced cohesive strength and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a relatively hard PSA is used to improve cohesive strength at high temperature, then cohesive strength is improved, but adhesion to rough surface deteriorates
Solution Approach 1:
The invention changes the chemical composition parameters of the PSA by incorporating specific ratios of hydrogenated styrene-butadiene block copolymer (30-70 wt%), styrene-isoprene block copolymer (10-50 wt%), and C9-based petroleum resin (10-50 wt%). This parameter optimization enables the adhesive to achieve both high cohesive strength at elevated temperatures and good adhesion to rough surfaces, resolving the trade-off between these two properties.
Solution Approach 2:
The invention creates a composite adhesive system by combining multiple polymer components (hydrogenated SBS block copolymer and SIS block copolymer) with a C9-based petroleum resin. This composite formulation synergistically provides both the structural integrity needed for high-temperature cohesive strength and the adhesive properties required for rough surface bonding, eliminating the need to choose between opposing performance characteristics.
2Reliability
If conventional tackifier resins with softening point below 110°C are used, then adhesion properties are improved, but cohesive strength at high temperature deteriorates
Solution Approach 1:
The invention specifically selects C9-based petroleum resin with a softening point of 100-180°C, optimizing the resin's thermal properties to maintain cohesive strength at high temperatures while preserving adhesion performance. This parameter control of the tackifier resin resolves the contradiction between adhesion and high-temperature cohesion.
3Strength
If phenol-based tackifier resin is added to improve adhesive strength, then adhesive strength is improved, but preservability deteriorates
Solution Approach 1:
The invention extracts and eliminates phenol-based tackifier resins from the adhesive composition, removing the source of deterioration while maintaining adhesive strength through alternative formulations using C9-based petroleum resin and optimized block copolymer combinations. This extraction of the harmful component resolves the contradiction between adhesive strength and preservability.
Data Source
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AI summary
A PSA composition comprising a block copolymer of a monovinyl-substituted aromatic compound and a conjugated diene compound, a tackifier resin, and a softening agent is provided. The tackifier resin comprises a natural product-based tackifier resin (A) having a softening point higher than 80°C and containing no aromatic ring, and a petroleum-based tackifier resin (B) having a softening point higher than 100°C and containing an aromatic ring. The content of the tackifier resin (A) is 40 to 120 parts by weight, the content of the tackifier resin (B) is 5 to 40 parts by weight, the total amount of the tackifier resin is 60 to 160 parts by weight, and the content of the softening agent is 5 to 40 parts by weight with respect to 100 parts by weight of the block copolymer, with respect to 100 parts by weight of the block copolymer,.