Modified Polyvinyl Acetal Adhesive for Organic and Inorganic Bonding
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Solution Overview
Problem
Current adhesives lack excellent adhesiveness to both organic materials like polycarbonate, acrylic, and nylon, as well as inorganic materials such as metal, and have poor handleability due to being solid at room temperature, requiring heating and solvent removal which can leave residual solvents.
Innovation Solution
A modified polyvinyl acetal with an imine structure, combined with a reactive diluent and polymerization initiator, allowing the adhesive to be in a liquid state at room temperature and exhibit strong adhesiveness to both organic and inorganic materials through crosslinking reactions, preventing solvent bleeding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyvinyl acetal is used as adhesive, then excellent adhesiveness to inorganic materials and transparency are achieved, but adhesiveness to organic materials is poor
Solution Approach 1:
The invention uses a composite adhesive system combining polyvinyl acetal resin with a silane coupling agent. The silane coupling agent acts as a bridge between the polyvinyl acetal and organic materials, enabling the adhesive to bond effectively to both inorganic and organic substrates. This composite approach resolves the contradiction by integrating two materials with complementary adhesion properties.
Solution Approach 2:
The silane coupling agent serves as an intermediary substance between the polyvinyl acetal resin and organic materials. It has affinity for both the resin and organic substrates, facilitating adhesion to organic materials while maintaining the resin's inherent adhesion to inorganic materials. This mediator enables universal adhesion without compromising the base resin's properties.
2Strength
If polyvinyl acetal is used as adhesive, then excellent toughness is achieved, but handleability is poor due to solid state at room temperature
Solution Approach 1:
The invention changes the physical state parameter of the adhesive from solid to liquid by incorporating a reactive diluent. This parameter change enables the adhesive to be applied at room temperature in a liquid state, improving handleability, while the polyvinyl acetal resin maintains its toughness after curing. The diluent allows the resin to flow and adhere without requiring heating.
Solution Approach 2:
The reactive diluent acts as an intermediary that temporarily modifies the physical state of the polyvinyl acetal resin. It allows the resin to be handled as a liquid at room temperature for application, then disappears through evaporation or reaction, leaving the tough cured adhesive behind. This mediator resolves the contradiction between solid-state toughness and liquid-state handleability.
3Ease of operation
If polyvinyl acetal solution in organic solvent is used, then handleability is improved, but residual solvent remains after removing step
Solution Approach 1:
The invention changes the solvent type from organic solvent to water-based solvent. This parameter change improves handleability while eliminating the harmful residual organic solvent problem. Water evaporates completely without leaving residues, and the adhesive maintains its performance. This resolves the contradiction by selecting a benign solvent that satisfies both handleability and purity requirements.
Solution Approach 2:
The invention uses water as a temporary solvent that serves its purpose during application and then completely evaporates without remaining. Water acts as a disposable medium that facilitates handling but leaves no harmful trace, unlike persistent organic solvents. This approach eliminates residual solvent issues while maintaining ease of application.
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 adhesive demonstrates excellent adhesiveness to a wide range of materials, including polycarbonate, acrylic, nylon, and metal, while maintaining handleability and transparency, with the reactive diluent's crosslinking reactions ensuring high tensile lap-shear strength and preventing bleeding.
Implementation Method 1
reacting the reactive diluent to cause crosslinking and curing reactions allows the adhesive to exhibit excellent adhesiveness to both organic materials and inorganic materials
Implementation Method 2
reacting the reactive diluent to cause crosslinking and curing reactions allows the adhesive to exhibit excellent adhesiveness to both organic materials and inorganic materials
Implementation Method 3
an adhesive containing a modified polyvinyl acetal having an imine structure together with a reactive diluent and a polymerization initiator
Data Source
Figure 1
AI summary
The present invention aims to provide an adhesive that has excellent adhesiveness to both organic materials (particularly, polycarbonate, acrylic, and nylon) and inorganic materials, is capable of exhibiting excellent transparency and toughness, and also has excellent handleability. The present invention relates to an adhesive containing: a modified polyvinyl acetal having an imine structure; a reactive diluent; and a polymerization initiator.