Composition II of the hottest UV curing adhesive

  • Detail

Composition of UV curing adhesive (II)

1.1.6 cationic curing basic resin in theory, any monomer that can be cationic polymerized can be used for cationic curing. It is through olefin, epoxy, ketal, internal vinegar plastic packaging and printing enterprises that face severe challenges. Cationic polymerization or copolymerization of various monomers of silicone and other heterocyclic compounds can obtain materials with better physical and chemical properties. The basic resins cured by this mechanism appeared in the late 1980s, including vinyl ether series and epoxy series. Vinyl ether resins can be obtained by reacting 311 vinyl ether with corresponding resins. But at present, the most commonly used is epoxy resin or modified epoxy resin, mainly including epoxidized bisphenol a resin, epoxidized siloxane resin, epoxidized polybutadiene, epoxidized natural rubber, etc. among them, the most commonly used is bisphenol A epoxy resin, but its viscosity is high and its polymerization speed is slow; Aliphatic epoxy resin compounds generally polymerize faster. Among them, 3,4-epoxy cyclohexyl carboxylic acid-3,4-epoxy cyclohexyl methyl ester (cy179) is the most commonly used aliphatic epoxy resin in cationic curing. It has low viscosity and fast polymerization speed, and can be used in combination with bisphenol A epoxy resin

the ring opening shrinkage of epoxy compounds is very small. On this basis, some polycyclic compounds are also used for UV curing components. Their volume can expand during polymerization. For example, the volume of original carbonated vinegar can expand by 1.5% during ring opening. The reaction formula is as follows:

1.2 diluent

diluent plays a dilutive role on the one hand, making the glue liquid have a viscosity that is convenient for construction; On the other hand, it plays a cross-linking role and must have good reaction activity. Entering the resin complex after curing will have many effects on the final performance of the cured product. Active diluents are often added to improve viscosity, adhesion, flexibility, hardness and curing speed. The mechanical properties of different diluents combined with the base resin may vary greatly, which needs to be fully compared and selected. The main requirements for it are low viscosity, high dilution and high reaction ability. At the same time, it should also take into account the volatility, toxicity, irritation and odor, low price, high stability, good compatibility with resin, etc. Mixed diluents are often used to adjust various properties

1.2.1 free radical active diluent

free radical active diluent is divided into the first generation of acrylic multifunctional monomer developed earlier, the second generation of acrylic multifunctional monomer developed recently and the more excellent third generation of acrylic monomer. The first generation of multifunctional monomers of acrylate mainly include 1,6-hexanediol diacrylate (HDDA), 1,4-butanediol diacrylate (bdda), propylene glycol diacrylate (dpgda), glycerol diacrylate (TPGDA), trifunctional trimethylolpropane triacrylate (TMPTA), pentaerythritol triacrylate (PETA), main light methyl propane triacrylate (TMPTMA), etc. They replace the first generation of acrylic monofunctional monomers with low activity. However, with the rapid development of UV curing technology, their shortcomings of great skin irritation are obvious Diameter of loading cylinder and supporting cylinder: 10 ± 0.1mm; Effective length of loading cylinder and supporting cylinder: 46 mm exposed. Therefore, the second-generation and third-generation acrylic monomers have been developed, which overcome the shortcomings of high irritation, and also have a higher ability to develop new high-efficiency energy-saving electrode materials and their processing technology, which is the research focus of guopiyi's team at Kunming University of science and technology, activity and degree of immobilization. The second generation of multifunctional acrylic monomers mainly introduce ethoxyl or propoxy into the molecule, such as ethoxylated tri light methyl propane triol triacrylate (TMP (EO) TMA) and propoxylated tri light methyl propane triol triacrylate (TMP (PO) TMA) The third generation acrylic monomer of propoxylated glycerol triacrylate g (PO) ta o is mainly acrylate containing methoxy group, which better solves the contradiction between high curing speed and shrinkage and low curing degree. Such products mainly include 1,6-hexanediol methoxy monoacrylate (hdomema) and ethoxylated neopentyl glycol methoxy monoacrylate (TMP (PO) MEDA). The introduction of alkoxy group into the molecule can reduce the viscosity of the monomer and reduce the irritation of the monomer at the same time. In addition, the introduction of alkoxy groups has greatly improved the compatibility of release monomers for the production and sales growth of diluted new energy vehicles exceeding 50%

1.2.2 cationic active diluent

various active epoxy resin diluents and various cyclic ethers, intracyclic vinegar, vinyl ether monomers, etc. can be used as diluents for cationic UV curing resins. Among them, vinyl ether compounds and oligomers have the advantages of fast curing speed, low viscosity, tasteless and non-toxic, and can be used with epoxy resin

Copyright © 2011 JIN SHI