One-pack type aqueous resin composition and fiber laminate
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Solution Overview
Problem
Aqueous urethane resin compositions used in manufacturing processes, such as for artificial leather and coatings, often require a two-component system with a crosslinking agent, which limits pot life and increases energy costs, while one-component systems without crosslinking agents struggle with adhesiveness and moist heat resistance.
Innovation Solution
A one-component aqueous resin composition is developed, comprising an aqueous urethane resin with a flow starting temperature of 50° C. to 155° C. and an acid value of 15 mgKOH/g or lower, which provides excellent adhesiveness and moist heat resistance without the need for a crosslinking agent, achieved by selecting specific polyols, chain extenders, and polyisocyanates to adjust the resin's properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a two-component system with crosslinking agent is used, then adhesiveness and durability are improved, but pot life is shortened and aging is required
Solution Approach 1:
The patent extracts and eliminates the crosslinking agent from the traditional two-component system, creating a one-component aqueous urethane resin composition that achieves crosslinking-free application while maintaining or improving adhesiveness and durability through optimized resin formulation
Solution Approach 2:
The patent changes the chemical composition parameters by selecting specific polyols (polyester polyol, polyether polyol), chain extenders, and polyisocyanates with controlled NCO groups, adjusting the resin structure to achieve excellent adhesiveness without crosslinking agents
2Reliability
If a two-component system with crosslinking agent is used, then durability is improved, but manufacturing process complexity increases
Solution Approach 1:
The patent removes the crosslinking agent component and the associated aging process, simplifying the manufacturing workflow to a single-component application that eliminates process management complexity while maintaining durability through optimized resin formulation
Solution Approach 2:
The patent combines the functions of adhesion and durability into a single-component system, merging the roles previously separated between the aqueous urethane resin and the crosslinking agent into one integrated formulation
3Loss of time
If a one-component system without crosslinking agent is used, then pot life is extended, but adhesiveness and durability deteriorate
Solution Approach 1:
The patent changes the chemical parameters of the aqueous urethane resin by controlling the molecular weight and structure of polyols, selecting appropriate chain extenders, and optimizing polyisocyanate content to achieve high adhesiveness in a one-component system
Solution Approach 2:
The patent creates a composite aqueous resin system containing multiple polyol types (polyester and polyether), chain extenders, and polyisocyanates that work synergistically to provide excellent adhesiveness and durability without crosslinking agents
Data Source
AI summary
The present invention provides a one-component aqueous resin composition including: an aqueous urethane resin (A), an aqueous urethane resin (A) that has a flow starting temperature of 50° C. to 155° C. and an acid value of 15 mgKOH/g or lower; and an aqueous medium (B). In addition, the present invention provides a fiber laminate including: a layer (iii) that is made from the one-component aqueous resin composition; and a fiber base (iv). The aqueous urethane resin (A) is preferably a specific anionic urethane resin (A-A-1) or an anionic urethane resin (A-A-2). The one-component aqueous resin composition of the present invention exhibits excellent adhesiveness and resistance to moist heat without the aid of a crosslinking agent.