Urethane Cross-Linking Agent for Enhanced Textile Washing Durability
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Solution Overview
Problem
Conventional cross-linking agents do not sufficiently enhance water- and oil-repellency, and there is a need for a cross-linking agent that improves washing durability.
Innovation Solution
A urethane compound formed from a long-chain alcohol with a hydrocarbon group of 7 to 40 carbon atoms, combined with a polyisocyanate, a blocking agent, and optionally an alcohol compound, to create an aqueous urethane composition that acts as a cross-linking agent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cross-linking agents are used, then the basic water- and oil-repellency is achieved, but the washing durability is insufficient
Solution Approach 1:
The patent changes the chemical parameters of the cross-linking agent by using specific isocyanate compounds (MDI, TDI, HDI, IPDI) with defined NCO content (20-30%) and molecular weight ranges. The urethane compound uses long-chain alcohols with 12-30 carbon atoms, creating a specific molecular structure that enhances washing durability while maintaining repellency.
Solution Approach 2:
The invention creates a composite cross-linking system by combining the urethane compound (formed from isocyanate and long-chain alcohol) with conventional cross-linking agents. This composite approach integrates the high washing durability of the urethane compound with the cross-linking functionality, achieving both water/oil repellency and enhanced durability.
2Reliability
If a cross-linking agent with high washing durability is developed, then the water- and oil-repellency is enhanced, but the complexity of the agent increases
Solution Approach 1:
The urethane compound serves multiple functions simultaneously: it acts as a cross-linking agent, provides water-repellency, provides oil-repellency, and enhances washing durability. This multi-functionality is achieved through its molecular structure containing both hydrophobic long-chain alcohol groups (for repellency) and reactive isocyanate groups (for cross-linking).
Solution Approach 2:
The patent merges the cross-linking function with the water- and oil-repellency function into a single urethane compound molecule. The isocyanate groups enable cross-linking while the long-chain alcohol groups provide hydrophobicity, combining previously separate functions into one integrated agent.
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 urethane compound enhances water- and oil-repellency and provides high washing durability, particularly for water-repellency, making it suitable for treating substrates like textiles and paper.
Implementation Method 1
A urethane compound (A) comprising units formed from: (A1) an isocyanate, and (A2) a long-chain alcohol
Implementation Method 2
R is each independently a hydrocarbon group having 7 to 40 carbon atoms... enhances water- and oil-repellency
Data Source
AI summary
A urethane compound (A) including units formed from (A1) an isocyanate and (A2) a long-chain alcohol represented by the formula HO—Z(Y—R)n [wherein the R moieties are each independently —O—, —NH—, —O—C(═O)—, —NH—C(═O)—, —C(═O)—NH—, —O—C(═O)—NH—, —NH—C(═O)—O—, —NH—C(═O)—NH—, —NH—S(═O)2—, —S(═O)2—NH—, —NH—(CH2)m—NH—S(═O)2—, —NH—(CH2)m—S(═O)2—NH—, etc. (m is an integer of 1-5), Z is a direct bond or a di- or trivalent hydrocarbon group having 1-5 carbon atoms, and n is 1 or 2]. Also disclosed is a urethane mixture containing the urethane compound (A), and at least one selected from the polyisocyanate (A1), the long-chain alcohol (A2), a blocking agent (A3) and an alcohol compound (A4); an aqueous urethane composition; a method for producing the aqueous urethane composition; a method of treating a substrate; and a treated textile product.