Polyurethane Elastic Yarn with Polybutadiene Structure
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Solution Overview
Problem
Conventional polyurethane elastic yarns have insufficient recoverability and heat resistance, particularly when used in blends with polyester, leading to limited applications due to chemical resistance issues and permanent set at low temperatures, and they often exhibit yellow coloration.
Innovation Solution
The development of a polyurethane elastic yarn comprising a blend of polyurethane A and polyurethane B, where polyurethane A contains a polybutadiene or polyisoprene structure with a specific ratio of 1,2-bonded to 1,4-bonded structures, and polyurethane B is synthesized using various diols and diisocyanates, along with chain extenders, to enhance strength, ductility, and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyurethane elastic yarn is made using conventional methods with polybutadiene polyol, then high strength and ductility are achieved, but recoverability and heat resistance are insufficient
Solution Approach 1:
The invention changes the chemical composition parameters by specifying polyurethane A must contain polybutadiene or polyisoprene structures with 1,2-bonded to 1,4-bonded ratios of 91:9 to 20:80, while polyurethane B uses various diols and diisocyanates. This parameter optimization resolves the contradiction by achieving both high strength and improved recoverability through controlled molecular structure
Solution Approach 2:
The invention creates a composite polyurethane elastic yarn consisting of two distinct polyurethane components (A and B) with different functional characteristics. Polyurethane A provides strength and elasticity through its polybutadiene/polyisoprene structure, while polyurethane B contributes to heat resistance and chemical resistance, together resolving the individual limitations of each component
2Strength
If polyurethane elastic yarn is made using conventional methods, then high strength is achieved, but heat resistance and chemical resistance are insufficient
Solution Approach 1:
The composite structure combining polyurethane A (with polybutadiene/polyisoprene for strength) and polyurethane B (with various diols for thermal stability) enables the yarn to simultaneously achieve high strength and heat resistance that neither component could provide alone
Solution Approach 2:
By optimizing the molecular weight, functional group ratios, and compositional proportions of the two polyurethane components, the invention achieves a balance between strength and heat resistance that overcomes the limitations of conventional single-component polyurethane elastic yarns
3Strength
If polyurethane elastic yarn is made using conventional methods, then high strength is achieved, but low-temperature characteristics and fatigue resistance are poor
Solution Approach 1:
The invention optimizes the 1,2-bonded to 1,4-bonded ratio of polybutadiene or polyisoprene structures in polyurethane A within the range of 91:9 to 20:80, which maintains strength while significantly improving low-temperature flexibility and fatigue resistance through controlled molecular chain configuration
4Ease of manufacture
If polyurethane elastic yarn is made using conventional methods, then production is simplified, but the yarn exhibits yellow coloration
Solution Approach 1:
The invention changes the chemical composition by incorporating polyisoprene structures and optimizing the 1,2-bonded to 1,4-bonded ratios, which inherently reduces yellowing tendency while maintaining production feasibility through standard polyurethane synthesis methods using diisocyanates and diols
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 resulting yarn exhibits improved strength, ductility, heat resistance, and reduced fatigue at low temperatures, providing excellent desorption characteristics, fit, appearance, and fade resistance, thus expanding its application scope beyond traditional uses.
Implementation Method 1
the present invention employs any of the claims 1-9... comprises (i) a polyurethane A and (ii) a polyurethane (B)
Implementation Method 2
polyurethane A contains a polybutadiene or polyisoprene structure with a specific ratio of 1,2-bonded to 1,4-bonded structures
Implementation Method 3
polyurethane B is synthesized using various diols and diisocyanates, along with chain extenders
Data Source
AI summary
{Problem} To provide a polyurethane elastic yarn which has the high strength and ductility sought in polyurethane elastic yarn, and also has excellent durability and heat resistance, as well as little fatigue at low temperature; and a production method thereof. {Means of Resolution} A polyurethane elastic yarn made from polyurethane which has polymer diol and diisocyanate as starting substances, wherein said polyurethane comprises a polyurethane A containing a polybutadiene structure in which the proportion of 1,2-bonded butadiene structure to 1,4-bonded butadiene structure in the molecule is in the range from 91:9 to 20:80.