Organic Acid Blowing Agent for Toxic-Free Polymer Expansion
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Solution Overview
Problem
There is a need for an alternative chemical blowing agent that is commercially viable and comparable to azodicarbonamide (ADCA) for thermally expandable thermoplastic or thermoset compositions, particularly for automotive manufacturing and building insulation, which does not pose health risks and can efficiently expand volumes without releasing toxic byproducts.
Innovation Solution
A curable volume expandable polymer composition comprising a combination of organic acids that decarboxylate to release carbon dioxide upon heating, providing synergistic gas generation and curing capabilities, thus achieving volume expansion and cross-linking without unpleasant odors or toxic byproducts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If azodicarbonamide (ADCA) is used as a chemical blowing agent, then volume expansion performance is improved, but health risks and toxic byproducts are generated
Solution Approach 1:
The patent changes the chemical composition parameters by replacing ADCA with a specific combination of organic acids (oxalic acid, malonic acid, succinic acid, glutaric acid, or adipic acid) that decompose at different temperatures to release CO2. This parameter change maintains the blowing agent function while eliminating toxic byproducts and health risks associated with ADCA.
Solution Approach 2:
The patent employs a composite blowing agent system combining multiple organic acids with complementary decomposition temperature ranges. This composite approach ensures continuous CO2 release across a broad temperature range (100-200°C), achieving reliable volume expansion while avoiding the harmful effects of single-component ADCA.
2Volume of moving object
If conventional chemical blowing agents are used, then volume expansion is achieved, but unpleasant odors are released
Solution Approach 1:
The patent converts the decomposition process into a beneficial outcome by selecting organic acids that decompose to release only CO2 and water vapor, transforming what could be a harmful decomposition process into a clean volume expansion mechanism that eliminates odors while maintaining effectiveness.
3Object-affected harmful factors
If alternative chemical blowing agents are used, then health safety is improved, but decomposition gas volume and activation temperature performance deteriorate
Solution Approach 1:
The patent creates a composite blowing agent system using multiple organic acids with different molecular weights and decomposition characteristics. This composite approach ensures sufficient total CO2 generation (maintaining gas volume) while all components decompose to safe, non-toxic products, thereby achieving both health safety and performance requirements.
Data Source
AI summary
The invention relates to a curable volume expandable polymer composition comprising an organic acid component, wherein the organic acid component comprises a first organic acid, a second organic acid, and optionally one or more additional organic acids; wherein said polymer composition, when being heated to an activation of expansion temperature above room temperature, undergoes volume expansion. When the organic acid component is heated to the activation of expansion temperature, the first organic acid and/or the second organic acid and/or the optionally present one or more additional organic acids decarboxylate and thus release carbon dioxide. The polymer composition traps the thus released carbon dioxide thereby causing the polymer composition to undergo volume expansion.