Photocurable Composition for Sealing Agents
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional photocurable compositions fail to exhibit stable physical characteristics in heat resistance and oil resistance tests while maintaining good debubbling properties and workability during coating.
Innovation Solution
A photocurable composition comprising a polymer with at least two (meth)acrylic groups, a (meth)acrylic monomer with a hydroxyl group, a saturated alicyclic skeleton monomer, and a photoinitiator, along with surface-modified fumed silica, which balances additive amounts to enhance heat resistance, oil resistance, and debubbling properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a polymer with (meth)acrylic groups is used to increase cross-linking density, then the cured product strength increases and surface stickiness decreases, but the cured product becomes adhesive and loses elasticity
Solution Approach 1:
The patent optimizes the additive amount of (meth)acrylic monomer to a specific range (0.1-10 parts by mass per 100 parts of polymer A) to achieve the desired balance between cross-linking density and elasticity. This parameter optimization resolves the contradiction by preventing excessive cross-linking that would cause adhesiveness while maintaining sufficient strength.
Solution Approach 2:
The patent creates a composite system combining polymer A (with main skeleton of (meth)acrylic monomer) and polymer B (with different monomer structure) in specific proportions. This composite approach allows the cured product to achieve both strength and elasticity by leveraging the complementary properties of the two polymer components.
2Strength
If excessive amount of (meth)acrylic monomer is added to increase cross-linking points, then the cured product strength increases, but the cured product becomes adhesive and brittle
Solution Approach 1:
The patent establishes specific parameter ranges for the additive amount of (meth)acrylic monomer (0.1-10 parts by mass per 100 parts of polymer A) to prevent excessive cross-linking. This parameter control prevents the cured product from becoming adhesive and brittle while maintaining sufficient strength.
Solution Approach 2:
The patent converts the potential harm of excessive (meth)acrylic monomer addition (which causes adhesiveness and brittleness) into a benefit by precisely controlling the additive amount within optimal ranges, thereby achieving strong yet flexible cured products.
3Strength
If (meth)acrylic monomer is added to strengthen the cured product, then cross-linking density increases, but heat resistance and other properties decrease
Solution Approach 1:
The patent optimizes the additive amount of (meth)acrylic monomer to a controlled range (0.1-10 parts by mass per 100 parts of polymer A) to achieve sufficient cross-linking density without excessive compromise to heat resistance. This parameter optimization balances strength enhancement with thermal stability preservation.
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 stable physical characteristics, excellent debubbling properties, and improved workability, making it suitable for use as a sealing agent in in-car electronic components, with retained elasticity and resistance to high temperatures and oils.
Implementation Method 1
a technique is known for curing a polymer having a (meth)acryloyl group by heating or active energy line application with the addition of an initiator which generates radical species
Implementation Method 2
The polymer can be cured in a short period of time by, in particular, ultraviolet irradiation
Data Source
AI summary
The present invention allows for a photocurable composition which exhibits stable physical characteristics in a heat resistance test and an oil resistance test, and exhibits good debubbling properties and excellent workability. A photocurable composition including components (A) to (C). component (A) : a compound that has a polymer obtained from a (meth) acrylic monomer as a main skeleton, and has at least two (meth)acrylic groups in the molecule component (B): a (meth)acrylic monomer including a component (b-1) and/or a component (b-2) component (b-1) : a (meth) acrylic monomer having a hydroxyl group in the molecule, in an amount of 0.1 to 50 parts by mass with respect to 100 parts by mass of the component (A), component (b-2): a (meth)acrylic monomer having a saturated alicyclic skeleton in the molecule, in an amount of 0.1 to 10 parts by mass with respect to 100 parts by mass of the component (A), component (C): a photoinitiator