Napped artificial leather
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Solution Overview
Problem
Existing napped artificial leathers face issues with low-quality dark color development, reduced light resistance, and color migration when dyed with cationic dyes or pigments, leading to poor peel strength and a distinct two-color impression.
Innovation Solution
A napped artificial leather with a non-woven fabric of isophthalic acid-modified polyester fibers containing 0.5 to 10 mass% carbon black, having an average fineness of 0.07 to 0.9 dtex, and an elastic polymer with a specific content ratio, ensuring a napped surface with a lightness L* value ≤20 and a peel strength of 3 kg/cm or more, while using metal complexed or sulfur dyes to prevent color migration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If disperse dyes are used to color polyester ultrafine fibers in a dark color, then the dark color development is improved, but the light resistance and color migration resistance are reduced
Solution Approach 1:
The invention changes the chemical composition parameters of the polyester fibers by incorporating specific copolymer units (carboxyl-containing polyester and hydroxyl-containing polyester) to create dye sites that enable strong dark color development with disperse dyes while maintaining excellent light and color migration resistance. The copolymer unit content is precisely controlled at 0.5-10 mass% to achieve optimal balance between color depth and durability.
2Reliability
If cationic dyes are used to color the polyurethane and fiber structure, then the color fastness is improved, but a distinct two-color impression occurs due to uneven dyeing
Solution Approach 1:
The invention applies local quality by creating specific dye-receptive sites (carboxyl and hydroxyl groups) only in the polyester fiber portions, while the polyurethane elastomer remains inherently dye-receptive to cationic dyes. This localized functional differentiation enables uniform dual-component dyeing where both materials absorb cationic dyes effectively, eliminating the two-color impression while maintaining excellent color fastness.
3Adaptability or versatility
If the content ratio of elastic polymer is increased to improve flexibility, then the dark color development and peel strength are reduced
Solution Approach 1:
The invention changes the chemical composition parameters of the polyester fibers by incorporating specific copolymer units (carboxyl-containing polyester and hydroxyl-containing polyester) to create dye sites that enable strong dark color development with disperse dyes while maintaining excellent light and color migration resistance. The copolymer unit content is precisely controlled at 0.5-10 mass% to achieve optimal balance between color depth and durability.
4Adaptability or versatility
If the content ratio of elastic polymer is increased to improve flexibility, then the peel strength and fiber bonding are reduced
Solution Approach 1:
The invention optimizes the elastomer content ratio parameter to 5-30 mass% of the total artificial leather composition, which provides sufficient flexibility while maintaining adequate peel strength. Additionally, the specific copolymer units in the polyester fibers (0.5-10 mass% carboxyl-containing and 0.5-10 mass% hydroxyl-containing units) enhance fiber-to-fiber bonding, compensating for the peel strength reduction caused by higher elastomer content.
Data Source
AI summary
Disclosed is a napped artificial leather including: a non-woven fabric containing polyester fibers having an average fineness of 0.07 to 0.9 dtex; and an elastic polymer applied in the non-woven fabric, wherein the polyester fibers contain 0.5 to 10 mass % of a dark color pigment, the napped artificial leather has a napped surface on which the polyester fibers on at least one side thereof are napped, and the napped surface has a lightness L* value based on the L*a*b* color system, of ≤20, and the napped artificial leather has a peel strength of 3 kg/cm or more, and a grade of color difference, determined using a Grey scale for assessing staining in an evaluation of color migration to a multifiber adjacent fabric (co-woven fabric No. 1; the same applied to the following) during pressurization under heating in a wet state under a load of 4 kPa at 200° C. for 60 seconds, of 4 or more.