Aqueous paint for leather coating and corresponding leather material
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Solution Overview
Problem
Existing aqueous coatings for leather materials in car interiors face challenges in achieving satisfactory adhesion, aging resistance, and molding processability, particularly with polyolefin materials, and solvent-based coatings have environmental drawbacks.
Innovation Solution
An aqueous paint comprising aqueous polyethersulfone-modified polyurethane, which enhances adhesion strength and aging resistance, and includes a crosslinking agent, anti-sticking agent, and cosolvent to improve coating properties, is developed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solvent-based coating is used, then coating performance is improved, but environmental pollution and unpleasant odor occur
Solution Approach 1:
The patent changes the fundamental parameter of the dispersion medium from organic solvent to water, transforming the coating system from solvent-based to aqueous-based. This parameter change eliminates environmental pollution and unpleasant odor while maintaining coating performance through careful selection of aqueous polyurethane dispersion and modification with polyethersulfone.
Solution Approach 2:
The patent introduces polyethersulfone as a modifying agent that acts as an intermediary between the aqueous polyurethane dispersion and the leather substrate. This intermediary substance enhances adhesion and coating performance in the aqueous system, compensating for the absence of organic solvents and achieving both environmental friendliness and high performance.
2Ease of manufacture
If common aqueous polyurethane coating is used on polyolefin materials, then coating is applied, but satisfactory adhesion cannot be achieved
Solution Approach 1:
The patent creates a composite coating system by combining aqueous polyurethane dispersion with polyethersulfone modification. This composite material synergistically enhances adhesion to polyolefin surfaces while maintaining ease of application, solving the contradiction between manufacturability and bonding strength.
Solution Approach 2:
The patent modifies the chemical structure and surface properties of the polyurethane coating through polyethersulfone modification, changing parameters such as polarity, molecular weight distribution, and surface energy to improve adhesion to polyolefin materials without compromising application properties.
3Object-affected harmful factors
If aqueous coating is used, then non-toxic and odorless properties are achieved, but aging resistance and coating adhesion need improvement
Solution Approach 1:
The patent develops a composite aqueous coating system integrating polyurethane dispersion with polyethersulfone modification, where the combined material properties provide both environmental friendliness and enhanced aging resistance and adhesion, simultaneously satisfying multiple contradictory requirements.
Solution Approach 2:
The patent applies polyethersulfone modification specifically to enhance local properties of the coating system, particularly adhesion to polyolefin surfaces and aging resistance, while the bulk aqueous polyurethane dispersion maintains non-toxic and odorless properties, achieving different qualities in different aspects of the same material.
Data Source
AI summary
The present invention relates to an aqueous paint for a leather coating. The aqueous paint comprises an aqueous polyethersulfone-modified polyurethane, wherein the aqueous polyethersulfone-modified polyurethane is an aqueous polyurethane dispersion chemically modified by a polyethersulfone. The present invention further relates to a leather material which comprises a leather layer and an aqueous coating coated on a surface of the leather layer, wherein the aqueous coating is prepared from the aqueous paint according to the present invention. The leather material obtained thereby can well meet the performance requirements for car interiors and has improved aging resistance and coating adhesion.