Numerical simulation method for solvent diffusion process in curing process of coated textile material

Abstract

The invention discloses a numerical simulation method for a solvent diffusion process in a curing process of a coated textile material. The method comprises the following steps: coupling and solving amass transfer equation, an energy conservation equation and an equation that the thickness of a coating film changes along with time, and quantitatively calculating the change condition of the concentration of a solvent in the coating film along with the time. According to the method, a textile material is a porous medium, in a coated fabric energy conservation equation, a coating liquid conformsto fluid heat transfer characteristics, and a fabric is described by using a porous medium heat transfer equation: when boundary conditions for solving a mass transfer equation are set, diffusion flux equations of a solvent on a coating liquid and air interface and a fabric and air interface are respectively considered, therefore, a more accurate solvent concentration distribution condition can be obtained. The method can help to determine the time required for curing the coated fabric, the thickness of the cured coating and the concentration of the residual solvent. Theoretical guidance andscientific basis are provided for optimization of coating textile material curing conditions, elimination of coating defects and development and design of novel drying equipment.

Description

Technical field[0001]The invention relates to a method for simulating the curing process of a coating material, in particular to a numerical simulation method for the solvent diffusion process during the curing process of a coating material whose substrate is a porous medium, in particular to a solvent diffusion process during the curing process of a coated textile material Numerical simulation method.Background technique[0002]Coated fabric refers to a composite fabric of fabric and polymer formed by coating polymer or other materials on the fabric substrate. Coating liquid is generally composed of high polymer and corresponding solvent. There are many types of commonly used high polymer, such as silicone resin, acrylic resin and polyurethane, etc. The acrylic resin film is transparent, not easy to yellow, and has good chemical stability , Weather resistance and flame retardancy, good adhesion to glass fiber, and low price, it has been widely used in construction, decoration, transp...

AI Technical Summary

Problems solved by technology

These diffusion models are all based on non-permeable substrates, and only study the diffusion of solvent at the coating film-air interface, but the solvent diffusion mechanism of coatings on porous permeable substrates such as textile materials has not yet been resolved

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