The rotary screen sensitive adhesive is an important raw material for making the net, it consists of an adhesive system and a photosensitive system, the adhesive system component is an epoxy resin (EP), and the photosensitive system component is a polyvinyl alcohol and a dichromate. Epoxy resins have the advantages of strong adhesion, high mechanical strength, good electrical insulation, chemical resistance, and no yellowing. However, they have a high degree of cross-linking, brittleness, insufficient impact toughness, fatigue resistance, and heat resistance. Peeling strength and other shortcomings. Therefore, in recent years, modification of epoxy resins and improvement of their toughness have become hot research topics. Toughening methods: (1) Acrylic epoxy resin is formed, and unsaturated double bonds are introduced at both ends of the epoxy resin molecular chain, resulting in two cross-linking points, but the toughness is not improved significantly; (2) in epoxy resin Adding toughening agents, such as polysulfone, polysulfone ether, polyimide ether or nitrile rubber, etc., have a certain toughening effect; (3) epoxy resin and acrylate resin, polyurethane, phenolic resin, polyphenylene sulfide And so on made of three-dimensional structure, mutual penetration, intertwined IPN, can improve physical and chemical properties, the degree of which depends on the interpenetrating condition. The performance of IPN is obviously higher than that of s-IPN. After IPN is composed of epoxy resin and polyurethane or polyacrylate, the high elasticity of polyurethane, the toughness of polyacrylate and the heat resistance, chemical resistance, and high adhesion of epoxy resin are achieved. Organically combined to increase its resistance to attack.
According to the mass ratio m (bisphenol A type epoxy resin): m (polyurethane) is composed of 90:10 IPN highest impact strength, can be used for flat net and rotary screen printing plate adhesive system. The tensile strength of s-IPN grafted with polyurethane and epoxy resin is the highest, and the impact strength of IPN made of polybutyl acrylate/EP can be increased by 20%~200%. Photosensitive adhesive and round net seal made of IPN epoxy resin The headgear has a significant increase in service life, good scratch resistance, and is less prone to blisters. Its commercial performance has been greatly improved. It is reported that Zhongda Technology has also researched and developed IPN epoxy resin.
Source: China Washing & Dyeing Industry Information Center
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