What are the main factors affecting the quality of coated products?

What are the main factors affecting the quality of coated products?

Coating finishing is a comprehensive process, and the main factors affecting the quality of coated products are coating agent, base fabric and processing technology.

Coating agent is the key to affecting the quality of coating products. The technical indicators of coating agent, in addition to the general particle size, viscosity, pH value, ionic type, and solid content, for the coating agent used for clothing fabrics, The film is required to be soft but not sticky. If the content of methyl methacrylate or methyl acrylate is high, the hand feel becomes hard, and the content is small, which will affect the strength of the film. The proportion of butyl acrylate is too much, and the hand feels soft, but it will be sticky. Therefore, the coating agent should have a viscosity suitable for processing, and the viscosity can be adjusted by adding a thickener, but it must have good rheology to facilitate processing operations. Another example is that the waterproof coating product requires the coating agent to meet the water pressure resistance of the waterproof product, so the content must be high. The content of foreign coating agents can reach 60%, while the content of domestic products is only 40% at most, generally around 30%. Due to the addition of certain additives to the coating agent, bubbles are often generated during processing, which will also affect the water pressure resistance. The coating agent also requires good compatibility with other chemical raw materials, otherwise it will easily become thinner or thicker, which will affect the coating process.

The base fabric used for coating needs to be pre-treated, and the fabric should not carry surfactants such as acid, alkali and other detergents. Defects such as drag color, knife wire and so on. The surface of the fabric is also required to be smooth and smooth, the yarns are arranged neatly, and there must be no "sparse road", "tight button" and other phenomena, so that the scraper can be evenly coated and not easily penetrated into the reverse side of the fabric, thereby improving the hand feel.

The quality of the waterproof coated fabric depends on the warp and weft density of the fabric. The tightness is high and the waterproofness is good; otherwise, the waterproofness is poor. When using the same coating processing method, the waterproof performance is 47.24 pieces/cm×27.56 pieces/cm (120 pieces/inch×70 pieces/inch) greater than 39.37 pieces/cm×20.87 pieces/cm ( 100/inch×53/inch) is greater than 16.93/cm×24.8/cm (43/inch×63/inch). The coating finishing process depends on the use of the final product and the base fabric. For example, pure cotton canvas fire-fighting clothing is required to have waterproof performance of washing resistance and water repellency. Due to the low warp and weft density of the base fabric and the uneven surface of the fabric, it is difficult to meet the requirements. For this reason, it is necessary to increase the coating amount and add functional additives in the coating agent in the process.