There are currently three types of liquid impregnated materials:       (1) latex with water as the dispersion medium, such as natural latex, synthetic latex (butadiene rubber, polyisoprene rubber, polyurethane, etc.); (2) solvent (xylene, tetrahydrofuran, dimethylacetamide, etc.) ) Is a polymer solution of the dispersion medium, such as polyurethane, liquid silicone rubber solution; (3) plastisol (mainly refers to PVC sol), that is, a liquid suspension sol prepared by using plasticizers and PVC paste powder.

Each type of material requires different dipping equipment and its application fields. This article mainly introduces PVC plastisol materials. PVC plastisol is an impregnated material different from the other two materials. Although its dispersion medium is a plasticizer, it does not volatilize during heating and hardening, but is compatible with the plasticization of PVC agglomerates. In soft (rubber state) or semi-rigid form. PVC sol is a widely used impregnated material due to its simple processing, high efficiency (the equipment process does not require a volatile recovery device), low material costs, softness, and excellent electrical properties. , Daily necessities, optical fiber communication protection, and medical and health protection are widely used in the field. The United States, Europe, Japan, and India are more mature in the field of PVC impregnation. China is a major producer and exporter of PVC, but the PVC impregnation technology started late.

With the advancement of material technology and the expansion of application fields, the functions of PVC plastisol materials have gradually increased, mainly including flame-retardant, UV-resistant, insulating, food-grade, biocompatible (medical), phthalate-free Formate, oil resistant. Among them, phthalate-containing PVC plastisol was the first to propose restrictions in Europe (phthalates will interfere with male endocrine and increase the probability of breast cancer in women), and it is gradually regulated, which limits some conventional growth Regarding the use of plasticizers, EU REACH / RoHS regulations are also becoming stricter.