Coating finishing is a comprehensive process. The main factors influencing the quality of coated products are coating agent, base fabric and processing technology.
The coating agent is the key to affect the quality of the coating product. The technical indicators of the coating agent, in addition to the general particle size, viscosity, pH value, ion type, and solid content, are for the coating agent used in apparel fabrics. The film is required to be soft but not sticky. Methyl methacrylate or methyl acrylate content is high, feel hard, less content, it will affect the film strength. The proportion of butyl acrylate is high, and the hand feels soft but sticky. Therefore, the coating agent should have a viscosity suitable for processing, adding a thickener can adjust the viscosity, but it must have good rheology to facilitate processing operations. Another example is that waterproof coating products require that the coating agent meet the water pressure resistance of the waterproof product, so the content must be high. The content of foreign coating agent can reach 60%, while the domestic product content is only 40%, usually about 30%. Due to the addition of a certain amount of additives to the coating agent, bubbles are often generated during processing, and the water pressure resistance is also affected. The coating agent also requires good compatibility with other chemical raw materials, otherwise it is easy to produce thinning or thickening, which affects the coating process.
The fabric used for the coating needs to be pre-treated. The fabric must not contain surfactants such as acids, alkalis and other detergents. The fuzz on the surface of the fabric requires singeing to be clean, so as not to affect the adhesion fastness of the coating and produce hair when applying the coating. Drag color, knife wire and other defects. The surface of the fabric is also required to be smooth, smooth, and neatly arranged between the yarns. There should be no phenomenon such as “dilute†or “tight†so that it will not only spread evenly on the back side of the fabric, but also improve the feel.
The quality of the waterproof coated fabric depends on the fabric's weft and weft density, high tightness, and good waterproof; otherwise, the waterproof is poor. When using the same coating method, the waterproof property is 47.24 pieces/cm×27.56 pieces/cm (120 pieces/inch×70 pieces/inch) more than 39.37 pieces/cm×20.87 pieces/cm ( 100 pieces/inch x 53 pieces/inch) greater than 16.93 pieces/cm x 24.8 pieces/cm (43 pieces/inch x 63 pieces/inch). The coating finishing process depends on the end product's use and base fabric. For example, pure cotton canvas fire fighting clothing requires waterproof performance with water resistance and water repellency. Due to the low warp and weft density of the base fabric, the fabric surface is not smooth and it is difficult to meet the requirements. For this reason, it is necessary to increase the coating amount in the process and add the functional assistant in the coating agent.
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