Moisture-Proof Insulating Coating Material for Electronic Parts
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Solution Overview
Problem
Conventional insulating coating materials for electronic parts have poor reworkability, leading to damage during removal and residue formation, which is a challenge in manufacturing sophisticated electronic products.
Innovation Solution
A moisture-proof and insulating coating material comprising a block copolymer or hydrogenated copolymer with controlled residual vinyl aromatic monomer and vinyl aromatic oligomer content, combined with an adhesive resin and solvent, to enhance reworkability and adhesion on electronic parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional insulating coating material is used, then moisture-proof and insulating properties are provided, but reworkability is poor and film fracture occurs during removal
Solution Approach 1:
The patent changes the chemical composition parameters of the coating material by strictly controlling the residual vinyl aromatic monomer content to 5 ppm or less and vinyl aromatic oligomer content to 10 ppm or less. This parameter control modifies the polymerization completeness and molecular weight distribution, enabling the coating to achieve both strong adhesion for reliability and easy removal for reworkability
Solution Approach 2:
The patent uses a composite material system comprising a block copolymer (specifically styrene-butadiene-styrene copolymer) as the main resin component, combined with carefully controlled residual monomers and oligomers. This composite structure provides both the protective function and the controlled removability, resolving the contradiction between durability and reworkability
2Ease of operation
If block copolymer is used to improve reworkability, then reworkability is enhanced, but removal is slow and fracture and residue formation occur
Solution Approach 1:
The patent optimizes the molecular weight distribution and composition of the block copolymer, specifically controlling the vinyl aromatic monomer content to 5 ppm or less and oligomer content to 10 ppm or less. This precise parameter control ensures rapid solvent penetration and uniform dissolution during removal, achieving fast removal without fracture or residue while maintaining good reworkability
Data Source
AI summary
The invention relates to a moisture-proof and insulating coating material comprising a block copolymer or hydrogenated copolymer thereof (A), an adhesive resin (B) and a solvent (C). The block copolymer or hydride (A) comprises at least two vinyl aromatic polymer blocks and at least one conjugated diene polymer block, and in the moisture-proof and insulating coating material, the content of residual vinyl aromatic monomer is less than 300 ppm, and the content of vinyl aromatic oligomer is less than 300 ppm. The moisture-proof and insulating coating material according to the invention has good reworkability. A moisture-proof and insulating film and a method for producing the same and an electrical component comprising the moisture-proof and insulating film and a method for producing the same are also provided in the invention.