Curable Resin Composition for Rapid Room-Temperature Curing and Transparency
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Solution Overview
Problem
Conventional room-temperature quick-cure adhesives, such as second-generation acrylics, face challenges in achieving rapid curing while maintaining high adhesive strength and transparency, especially when bonding objects that are resistant to moisture penetration, and they often contain colored components that hinder the production of transparent cured objects.
Innovation Solution
A curable resin composition is developed, comprising a polymerizable vinyl monomer, a curing agent, a reducing agent, and an acrylic block copolymer with specific structural and molecular weight characteristics, which enables rapid curing at room temperature with high adhesion and transparency, suitable for use with transparent resins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional SGA adhesives are used for room-temperature quick-cure, then curing speed and adhesive strength are improved, but transparency of the cured object deteriorates due to colored components
Solution Approach 1:
The invention changes the chemical parameters of the adhesive system by replacing conventional colored curing agents with colorless hydrazine derivatives and colorless polymerizable vinyl monomers. This parameter change maintains the rapid room-temperature curing mechanism while eliminating the colored components that prevent transparency, thus resolving the contradiction between curing speed and transparency.
Solution Approach 2:
The invention uses a composite formulation combining hydrazine derivatives, colorless polymerizable vinyl monomers, and photopolymerization initiators. This composite material system achieves both rapid curing through multiple reaction mechanisms and transparency through the selective use of colorless components, overcoming the limitations of conventional SGA adhesives.
2Ease of manufacture
If wet-set type adhesive is used for transparency, then transparency is improved, but adhesive strength and curing speed deteriorate when bonding moisture-resistant objects
Solution Approach 1:
The invention changes the curing mechanism parameters by introducing photopolymerization initiators alongside hydrazine derivatives. This dual-mechanism approach enables the adhesive to cure through both moisture reaction and light activation, achieving high adhesive strength on moisture-resistant surfaces while maintaining transparency through the use of colorless components.
Solution Approach 2:
The photopolymerization initiator acts as an intermediary that enables curing without relying solely on moisture penetration. By introducing this intermediate curing mechanism, the adhesive can achieve rapid setting and high strength on moisture-resistant surfaces while the colorless formulation maintains transparency.
3Strength
If conventional acrylic rubber and curing agents are used, then adhesive strength is improved, but transparency deteriorates
Solution Approach 1:
The invention changes the material composition parameters by selecting specific colorless hydrazine derivatives and colorless polymerizable vinyl monomers. These parameter changes maintain the crosslinking density and adhesive strength characteristics of conventional systems while eliminating chromophores, thus achieving both high strength and transparency.
Solution Approach 2:
The invention uses small molecular weight hydrazine derivatives that provide efficient crosslinking without requiring large polymer chains. These small molecules achieve the necessary adhesive strength through dense crosslinking while their small size and lack of chromophores allow for high transparency in the cured adhesive layer.
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 high tensile shear adhesion strength and maintains transparency, making it suitable for bonding and coating applications, particularly with transparent resins, while ensuring rapid curing and strong adhesion.
Implementation Method 1
a curable resin composition comprising (1) a polymerizable vinyl monomer, (2) a curing agent, (3) a reducing agent and (4) an acrylic block copolymer
Implementation Method 2
comprising (1) a polymerizable vinyl monomer, (2) a curing agent, (3) a reducing agent
Data Source
AI summary
A curable resin composition that is adhesive and transparent. The curable resin composition comprises (1) a polymerizable vinyl monomer, (2) a curing agent, (3) a reducing agent, and (4) an acrylic block copolymer having a structure represented by formula (1):[a1]-[b]-[a2] (1)wherein [a1] and [a2] each independently represents a polymer block which consists mainly of structural units derived from an alkyl acrylate and/or an alkyl methacrylate and has a glass transition temperature of 90° C. or higher, and [b] represents a polymer block which consists mainly of structural units derived from an alkyl acrylate and/or an alkyl methacrylate and has a glass transition temperature of −10° C. or lower, the copolymer satisfying the relationship (total mass of [a1] and [a2]/(mass of [b])=5/95 to 80/20.