Bio-renewable Polyester Anti-redeposition Agent
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Solution Overview
Problem
Current anti-redeposition agents used in textile washing, primarily synthetic petrochemical polymers, are not biodegradable and contribute to environmental pollution, posing risks to aquatic and animal life, and there is a need for environmentally friendly alternatives to prevent dye redeposition on fabrics during washing.
Innovation Solution
A water-soluble polyester made from bio-renewable raw materials, such as polyglycerol mixtures, sugar alcohols, sebacic acid, and other components, is used as an anti-redeposition agent, which can be added to the washing bath to prevent dye redeposition and is biodegradable, meeting effluent discharge regulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synthetic petrochemical polymer products are used as anti-redeposition agents, then dye redeposition is prevented effectively, but environmental pollution increases due to non-biodegradability
Solution Approach 1:
The patent changes the chemical composition parameters of anti-redeposition agents from synthetic petrochemical polymers to bio-renewable polymers with specific molecular weight ranges (1,000-1,000,000 g/mol) and functional groups, achieving both effective dye redeposition prevention and biodegradability
Solution Approach 2:
The patent uses composite bio-renewable polymers formed by combining multiple natural polymer components (starch, cellulose, chitosan, protein, alginate) with specific ratios, creating materials that maintain anti-redeposition effectiveness while enhancing biodegradability and reducing environmental harm
2Object-generated harmful factors
If bio-renewable polymers are used as anti-redeposition agents, then environmental friendliness is improved, but anti-redeposition effectiveness may be reduced
Solution Approach 1:
The patent optimizes molecular weight parameters (1,000-1,000,000 g/mol) and functional group composition of bio-renewable polymers to maximize anti-redeposition effectiveness while maintaining biodegradability, resolving the trade-off between environmental friendliness and performance
Solution Approach 2:
The patent mimics the functional properties of synthetic polymers by selecting and combining natural polymers with similar molecular structures and surface properties, allowing bio-renewable alternatives to achieve comparable anti-redeposition effectiveness
3Reliability
If petroleum polymer microparticles are released during washing, then anti-redeposition function is achieved, but pollution to waterways and oceans increases
Solution Approach 1:
The patent converts the harmful non-biodegradable property of synthetic polymers into a benefit by using biodegradable bio-renewable polymers that break down into harmless natural substances, eliminating pollution to waterways and oceans while maintaining anti-redeposition function
Solution Approach 2:
The patent enables the anti-redeposition agent to be discarded safely through biodegradation into natural byproducts (CO2, H2O, biomass) that can be recovered or safely returned to the environment, eliminating persistent pollution
Data Source
AI summary
A method for preventing a redeposition during washing of dyed fabric or garments made from natural and synthetic fibers is provided. The method may include admixing 0.1% to 1% of at least one anti-redeposition agent to an aqueous bath depending on the total weight of the dyed fabric to be washed. The anti-redeposition agent may include a water-soluble polyester made from bio-renewable raw materials. The water-soluble polyester may include a reaction product of a polyglycerol mixture, a sugar alcohol, a sebacic acid, and one of an unsaturated fatty acid, a saturated fatty acid, a fat or an oil, a polylactic acid, or polyhydroxyalkanoate.