Speaker Adhesive Composition for Damper Curing and Bonding
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Solution Overview
Problem
Conventional adhesive compositions fail to balance curability, hardness, and adhesive bonding ability, particularly for damper materials requiring specific hardness levels, and have issues with curing rates and exposure to ultraviolet light.
Innovation Solution
A two-component adhesive composition comprising (meth)acrylic monomers, thermal and photo-radical polymerization initiators, aromatic amines, and organic metal salts, specifically using trimethylolpropane tri(meth)acrylate and β-diketone chelates, which are divided into first and second components for optimal curing and bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ultraviolet curable adhesive is used to achieve fast curing in a few seconds, then curing rate is improved, but the adhesive remains uncured in portions not exposed to ultraviolet ray
Solution Approach 1:
The patent combines two different curing mechanisms into a single adhesive system: UV curing for fast surface curing and thermal curing for complete curing in uncured portions. The adhesive contains both photopolymerization initiators and thermal curing components (polyfunctional methacrylate, monofunctional methacrylate, and thermal initiator), allowing the adhesive to be cured by either UV irradiation or thermal heating, thus ensuring complete curing regardless of UV exposure uniformity.
2Strength
If conventional adhesive compositions are used to achieve adhesive bonding, then bonding ability is provided, but the composition cannot balance curability, hardness, and adhesive bonding ability simultaneously
Solution Approach 1:
The patent carefully adjusts the parameters of the adhesive composition by specifying precise ratios of polyfunctional methacrylate (10-70 parts), monofunctional methacrylate (10-60 parts), and trimethylolpropane tri(meth)acrylate (10-60 parts) based on 100 parts of total monomer. This parameter optimization enables the adhesive to achieve balanced performance in curability, hardness, and bonding ability simultaneously.
Solution Approach 2:
The patent uses a composite adhesive system combining multiple methacrylate components with different functional properties: polyfunctional methacrylate provides crosslinking density for hardness, monofunctional methacrylate provides bonding ability, and trimethylolpropane tri(meth)acrylate provides both. This composite approach allows simultaneous optimization of curability, hardness, and adhesive bonding ability.
3Ease of operation
If room temperature setting adhesive is used to cure at normal temperatures for short period, then working efficiency is improved, but the cycle time cannot be reduced further to several seconds
Solution Approach 1:
The adhesive is designed to perform preliminary UV curing to achieve surface setting within several seconds, while thermal curing continues in the background to complete the bonding. This preliminary action allows the adhesive to provide immediate surface strength for handling while completing the full curing process without extending the operational cycle time.
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 excellent curability, adhesive bonding ability, and hardness, enabling fast curing and suitable for damper materials with improved sound quality and vibration resistance.
Implementation Method 1
a polymerizable vinyl monomer containing 10 to 70 parts by mass of (1-1), 10 to 60 parts by mass of (1-2), and 10 to 60 parts by mass of (1-3) based on 100 parts by mass of (1) the polymerizable vinyl monomer
Implementation Method 2
a photo-radical polymerization initiator
Implementation Method 3
an organic metal salt
Data Source
AI summary
A composition having excellent curability and adhesive bonding ability is provided. A composition, comprising the following components (1) to (5): (1) a polymerizable vinyl monomer containing 10 to 70 parts by mass of (1-1), 10 to 60 parts by mass of (1-2), and 10 to 60 parts by mass of (1-3) based on 100 parts by mass of (1) the polymerizable vinyl monomer, in which (1-1) is a (meth)acrylic monomer represented by the formula (A) Formula (A) Z—O—R1 (wherein, Z represents a (meth)acryloyl group, and R1 represents an alkyl group.), (1-2) is a (meth)acrylic monomer represented by the formula (B) (wherein, Z and Z′ represent a (meth)acryloyl group, and R2 and R2′ represent an alkylene group; R2 and R2′ may be the same as or different from one another; R3 and R3′ represent a hydrogen atom, or an alkyl group having 1 to 4 carbon atoms; R3 and R3′ may be the same as or different from one another; m and n represent an average number of moles of alkylene oxide added (proportion of alkylene oxide added)), (1-3) is a (meth)acrylic monomer that is a (meth)acrylic acid ester of a polyhydric alcohol; (2) a thermal radical polymerization initiator; (3) a photo-radical polymerization initiator; (4) an aromatic amine and/or pyridine derivative; and (5) an organic metal salt.