Water-based urethane resin composition and synthetic leather
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Solution Overview
Problem
Current aqueous urethane resins lack sufficient wear resistance and hydrolysis resistance, making them unsuitable for applications requiring high durability, such as automobile interior materials and sports shoes.
Innovation Solution
An aqueous urethane resin composition is developed, comprising a reaction product of polyol, reactive silicone with a number average molecular weight of 4,000 or more, polyisocyanate, and chain extenders like ethylenediamine or piperazine, dispersed in an aqueous medium, which enhances wear and hydrolysis resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If aqueous urethane resins are used to eliminate DMF, then environmental compliance is improved, but wear resistance and hydrolysis resistance deteriorate
Solution Approach 1:
The patent changes the chemical parameters of the aqueous urethane resin by incorporating specific components: reactive silicone with number average molecular weight of 4,000 or more, and chain extenders (ethylenediamine, isophoronediamine, or piperazine). These parameter changes transform the resin's properties to achieve both environmental compliance and high durability.
Solution Approach 2:
The patent creates a composite aqueous urethane resin system by combining multiple components: polyol, reactive silicone, polyisocyanate, chain extenders, and aqueous medium. This composite approach allows the resin to simultaneously achieve environmental friendliness (aqueous base) and high performance (wear and hydrolysis resistance through synergistic component interactions).
2Object-generated harmful factors
If conventional aqueous urethane resins are used, then environmental friendliness is improved, but durability for high-demand applications deteriorates
Solution Approach 1:
The patent modifies the resin's molecular structure parameters by using chain extenders with specific functional groups (diamines and piperazine) that create more robust crosslinked networks. This increases the service life and durability of the coating in demanding applications while maintaining the aqueous (low VOC) formulation.
Solution Approach 2:
The patent introduces reactive silicone with specific molecular weight characteristics (4,000 or more) to create localized regions of enhanced properties within the resin matrix. This localized quality improvement contributes to superior wear and hydrolysis resistance in specific application areas without compromising the overall environmental friendliness of the aqueous system.
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 composition exhibits excellent wear resistance and hydrolysis resistance, enabling its use in high-demand applications like synthetic leather for automobile interiors and sports shoes, where conventional aqueous urethane resins fall short.
Implementation Method 1
a reactive silicone (a2) having a number average molecular weight of 4,000 or more and having a functional group reactive with an isocyanate group
Implementation Method 2
one or more chain extenders selected from the group consisting of ethylenediamine, isophoronediamine, and piperazine
Data Source
AI summary
The present invention provides an aqueous urethane resin composition including: a urethane resin (A) that is a reaction product of essential ingredients including a polyol (a1), a reactive silicone (a2) having a number average molecular weight of 4,000 or more and having a functional group reactive with an isocyanate group, and a polyisocyanate (a3); and an aqueous medium (B). The present invention also provides a synthetic leather including a skin layer formed from the aqueous urethane resin composition and/or a surface-treated layer formed from the aqueous urethane resin composition. An object of the present invention is to provide an aqueous urethane resin composition excellent in wear resistance and hydrolysis resistance. The aqueous urethane resin composition of the present invention can be suitably used for a skin layer of a synthetic leather and its surface-treated layer.