Napped artificial leather and method for producing the same
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Solution Overview
Problem
Napped artificial leathers with fiber-entangled bodies of ultrafine fibers face challenges with low color fastness to rubbing, especially when colored dark, and existing solutions like applying polyolefin or fatty acid amides do not effectively improve this property without compromising surface quality.
Innovation Solution
A napped artificial leather with ultrafine fibers and an elastic polymer, where particles of a fatty acid amide-based compound are attached to the fiber surfaces, providing improved color fastness to rubbing by reducing friction and maintaining particulate form even at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyolefin such as paraffin wax is applied to the napped surface to improve color fastness to rubbing, then color fastness to rubbing is improved, but the quality of the touch is reduced and tack is caused on the surface
Solution Approach 1:
The patent changes the physical form of the fatty acid amide from bulk application to fine particles (5-50 μm diameter). This particle form allows the material to reduce friction and improve color fastness without forming a continuous film that would cause tackiness, thus resolving the contradiction between color fastness and touch quality.
Solution Approach 2:
The fatty acid amide particles are applied specifically to the napped surface where friction occurs, providing localized friction reduction and color fastness improvement without affecting the bulk properties or causing overall surface tackiness.
2Reliability
If fatty acid amide is applied to the napped artificial leather to improve color fastness to rubbing, then color fastness is improved, but the fatty acid amide forms a film on fiber surfaces that reduces flexibility
Solution Approach 1:
The patent specifies fine particle size (5-50 μm) for the fatty acid amide, which prevents film formation while maintaining the friction-reducing properties. The particles remain discrete and do not coalesce into a continuous film, thus preserving fiber flexibility while improving color fastness.
3Illumination intensity
If the napped artificial leather is colored in dark color, then aesthetic appearance is improved, but color fastness to rubbing is reduced
Solution Approach 1:
The fatty acid amide particles act as an intermediary substance between the dark-colored fibers and the rubbing surface. They reduce friction and prevent direct contact between the dyed fibers and opposing surfaces, thereby preventing color migration while allowing dark colors to be used.
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 solution achieves excellent color fastness to rubbing while maintaining a quality appearance, particularly when the napped artificial leather is colored dark, with the fatty acid amide particles effectively preventing color migration and retaining their form under high temperatures.
Implementation Method 1
particles of a fatty acid amide-based compound that are attached to surfaces of the ultrafine fibers... effectively preventing color migration... by reducing friction
Implementation Method 2
maintaining particulate form even at high temperatures... retaining their form under high temperatures
Data Source
AI summary
Disclosed is a colored napped artificial leather including: a fiber-entangled body including ultrafine fibers having an average single fiber fineness of 0.5 dtex or less; and an elastic polymer impregnated into the fiber-entangled body, the napped artificial leather having, at least on one side thereof, a napped surface formed by napping the ultrafine fibers, wherein the napped artificial leather further includes particles of a fatty acid amide-based compound that are at least attached to surfaces of the ultrafine fibers and that have an average particle size of 0.1 to 10 μm.