Low-Sulfur PSA Sheet for Metal Corrosion Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Water-dispersed acrylic pressure-sensitive adhesive (PSA) sheets can cause non-contact metal corrosion due to the release of sulfur-containing gases, leading to contact defects and quality issues in electronic devices and other applications.
Innovation Solution
A PSA sheet with a water-dispersed acrylic polymer synthesized using a sulfur-containing chain transfer agent, such as tertiary mercaptans or aromatic mercaptans, is developed to minimize sulfur-containing gas emission, preventing metal corrosion while maintaining effective adhesive properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a water-dispersed acrylic PSA composition is used instead of organic solvent-based composition, then environmental health and safety are improved, but metal corrosion occurs due to sulfur-containing gas emission
Solution Approach 1:
The invention changes the chemical structure parameters of the chain transfer agent from conventional sulfur-containing agents to specific tertiary mercaptans or aromatic mercaptans with restricted sulfur content (0.01-5 mass%). This parameter change reduces sulfur-containing gas emission while maintaining the water-dispersed acrylic PSA composition's environmental benefits and adhesive performance.
Solution Approach 2:
The invention converts the potentially harmful sulfur-containing chain transfer agent into a beneficial component by selecting specific types (tertiary mercaptans or aromatic mercaptans) that minimize sulfur-containing gas emission. The sulfur component, which could cause corrosion, is transformed into a controlled additive that maintains polymerization efficiency without generating harmful emissions.
2Strength
If a sulfur-containing chain transfer agent is used in acrylic polymer synthesis, then adhesive properties are improved, but sulfur-containing gas is emitted causing metal corrosion
Solution Approach 1:
The invention changes the structural parameters of the chain transfer agent to tertiary mercaptans or aromatic mercaptans with specific sulfur content ranges (0.01-5 mass%). This structural modification maintains the chain transfer agent's ability to control molecular weight and enhance adhesive strength while significantly reducing sulfur-containing gas emission that causes metal corrosion.
Solution Approach 2:
The invention creates a composite PSA composition that combines water-dispersed acrylic polymer with specifically selected sulfur-containing chain transfer agents (tertiary mercaptans or aromatic mercaptans). This composite approach integrates the adhesive benefits of sulfur-containing agents while mitigating their harmful emission effects through careful material selection and composition control.
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 PSA sheet achieves low sulfur-containing gas emission, effectively preventing metal corrosion and ensuring strong adhesive properties, making it suitable for use in electronic devices and other applications where metal corrosion is a concern.
Implementation Method 1
a water-dispersed acrylic polymer synthesized in the presence of a chain transfer agent containing sulfur as a constituent atom (sulfur-containing chain transfer agent)
Implementation Method 2
The PSA sheet achieves low sulfur-containing gas emission, effectively preventing metal corrosion
Data Source
Figure 1~3
Figure 4~6
AI summary
A pressure-sensitive adhesive (PSA) sheet with low sulfur gas emission is provided. Metal corrosion due to outgassing components of the adhesive sheet is thereby prevented. The sheet comprises a PSA layer formed from a water-dispersed PSA composition. The PSA composition contains a water-dispersed acrylic polymer synthesized using a sulfur-containing chain transfer agent. Moreover, in a gas generation test whereby the PSA sheet is heated at 85°C for one hour, the emission of sulfur-containing gas is 0.043 μg or less per 1 cm2 surface area of the sheet, when converted to SO42-.