Polyamide coating slurry and its preparing method, and process for preparing polyamide-coated fabric for printing
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Solution Overview
Problem
Existing polyamide coatings face challenges in precise inkjet printing due to poor ink absorption and permeability, primarily attributed to the use of fillers like calcium carbonate and kaolin, and the inherent properties of polyamide 6 coatings.
Innovation Solution
A polyamide coating slurry is developed, comprising polyamide 6, polyvinyl butyral, polyoxypropylene lauryl ether, urea, and poly-N-isopropylacrylamide as solutes, ethanol as a solvent, and calcium chloride and lipophilic nano silica sol as functional auxiliary agents, which enhances ink absorption and permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If calcium carbonate and kaolin are used as fillers in the coating slurry, then the feel and thickness of the coating are improved, but the ink absorption performance deteriorates due to poor functionality and rough particles
Solution Approach 1:
The patent changes the particle size parameter of the filler from conventional micron-sized calcium carbonate and kaolin to nano-sized silica (50-80 nm). This parameter change transforms the filler from having rough surfaces that hinder ink absorption to having smooth surfaces that facilitate ink penetration, while still maintaining the desired coating thickness and feel through controlled nano-particle distribution.
Solution Approach 2:
The patent creates a composite coating system combining polyamide 6 with polyvinyl butyral and nano silica. This composite material integrates the strength and wear resistance of polyamide with the ink-absorbing properties of nano silica and the adhesive characteristics of polyvinyl butyral, achieving both good feel and excellent ink absorption simultaneously.
2Strength
If polyamide 6 coating is applied to fabric, then wear resistance and high strength are achieved, but ink adsorption and permeability are insufficient causing diffusion and blurring of ink lines
Solution Approach 1:
The patent applies local quality modification by introducing nano silica particles specifically at the coating surface where ink contact occurs. The bulk polyamide 6 matrix maintains its high strength and wear resistance, while the nano silica surface layer provides enhanced ink absorption and prevents ink diffusion, creating different functional zones within the coating structure.
Solution Approach 2:
The patent utilizes the porous structure of nano silica particles to create a network within the coating that facilitates ink penetration. The nano-porous structure provides numerous pathways for ink to rapidly absorb into the coating without causing diffusion or blurring, while the overall coating structure maintains its mechanical integrity through the polyamide 6 matrix.
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 modified polyamide coating slurry significantly improves ink absorption and permeability, enabling high-precision inkjet printing by altering the surface structure and lipophilicity of the coating, thus overcoming the limitations of traditional polyamide coatings.
Implementation Method 1
The modified polyamide coating slurry significantly improves ink absorption and permeability, enabling high-precision inkjet printing by altering the surface structure and lipophilicity of the coating
Implementation Method 2
Polyamide wet coating uses ethanol-calcium chloride solvent to dissolve nylon waste silk to prepare coating slurry. After coating, a phase inversion occurs in a coagulation bath to form a layer of polymer film on the surface of the fabric
Data Source
AI summary
A polyamide coating slurry and its preparing method, and a process for preparing polyamide-coated fabric for printing are provided. The present disclosure provides a polyamide coating slurry for precise inkjet printing with wide applicability simple preparation steps. The surface structure and lipophilicity of the coating can be changed by mixing polyvinyl butyral and polyoxypropylene lauryl ether, urea and poly-N-isopropylacrylamide in polyamide 6, so that the adsorption properties and permeability of the coating to ink are greatly improved, and thus high-precision inkjet printing can be realized.