Self-Adsorbable Foamed Laminate Sheet Weather Resistance
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Solution Overview
Problem
Self-adsorbable foamed sheets lack weather resistance and leave paste residue when used outdoors, as existing technologies have not been developed to enhance their outdoor usability and residue-free application.
Innovation Solution
A composition for a self-adsorbable foamed sheet comprising a copolymer with a solubility parameter of 9.7 (cal/cm³)⁻¹² or less and a glass-transition temperature of -10 °C or less, combined with a carbodiimide crosslinking agent, which includes an alkenyl aromatic monomer unit and optional (meth)acrylate and conjugated diene monomer units, to create a laminate sheet with improved weather resistance and no paste residue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional foamed resin compositions are used for self-adsorbable foamed sheets, then mechanical strength is improved, but weather resistance deteriorates and paste residue occurs when used outdoors
Solution Approach 1:
The patent changes the chemical composition parameters of the foamed resin by incorporating specific monomer units (alkenyl aromatic monomer units at 10-55 mass%, unsaturated carboxylic acid monomer units at 1-20 mass%) and controlling the solubility parameter to 9.7 (cal/cm³)¹/² or less. This parameter optimization enables the material to achieve both mechanical strength and weather resistance, resolving the contradiction between strength and outdoor usability.
Solution Approach 2:
The patent creates a composite resin system combining multiple monomer units with complementary properties: alkenyl aromatic monomers provide structural backbone and hydrophobicity for weather resistance, while unsaturated carboxylic acid monomers enable crosslinking for mechanical strength. This composite approach allows simultaneous achievement of both strength and weather resistance that single-component resins cannot provide.
2Ease of manufacture
If self-adsorbable foamed sheets are designed for indoor use with conventional compositions, then ease of manufacture is improved, but adaptability to outdoor conditions deteriorates
Solution Approach 1:
The patent modifies the resin composition parameters to include specific monomer ratios and solubility parameter control, which maintains manufacturing simplicity while enabling outdoor usability. The crosslinking mechanism using conventional carbodiimide agents preserves ease of manufacture, while the optimized monomer composition provides the necessary weather resistance and water repellency for outdoor applications.
3Strength
If crosslinking agents are added to improve mechanical strength, then strength is improved, but paste residue increases when used outdoors
Solution Approach 1:
The patent changes the chemical structure parameters of the resin system by incorporating unsaturated carboxylic acid monomer units that provide crosslinking sites without requiring excessive crosslinking agents. The optimized monomer composition enables effective crosslinking at lower agent concentrations, reducing paste residue while maintaining mechanical strength.
Solution Approach 2:
The patent employs carbodiimide crosslinking agents that decompose into harmless byproducts (water and CO2) after crosslinking, rather than leaving persistent residue. This approach uses a temporary chemical agent that fulfills its crosslinking function and then degrades, minimizing harmful residue compared to conventional crosslinking systems.
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 solution results in a self-adsorbable foamed laminate sheet with excellent weather resistance and no paste residue, maintaining mechanical strength and adhesion properties while preventing water intrusion and formaldehyde emission.
Implementation Method 1
water intrusion can be prevented based on the hydrophobicity of the alkenyl aromatic monomer unit to improve weather resistance
Implementation Method 2
a composition for a self-adsorbable foamed sheet comprises: a copolymer containing an unsaturated carboxylic acid monomer unit and having a solubility parameter (SP value) of 9.7 (cal/cm 3)¹/² or less; and a crosslinking agent
Data Source
Figure 1
AI summary
Provided are a self-adsorbable foamed laminate sheet having excellent weather resistance and causing no paste residue, and a composition for a self-adsorbable foamed sheet used to obtain the self-adsorbable foamed laminate sheet. A composition for a self-adsorbable foamed sheet comprises: a copolymer containing an unsaturated carboxylic acid monomer unit and having a solubility parameter (SP value) of 9.7 (cal/cm3)1/2 or less and a glass-transition temperature of -10 °C or less; and a crosslinking agent.