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Photodegradable paint crosslinking agent
2017-8-6 21:10:43
Photodegradable paint crosslinking agent
Diethyltoluenediamine Raw material ：
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
Light coating when light irradiation crosslinking agent is stable, when hit by a light or ultraviolet light, its system of photosensitive material can be produced by photochemical reaction active group, causing crosslinking polymerization, sexual intercourse is called photolysis type latent agent.
At present, the uv cross-linking system of photodecomposition crosslinking agent can be divided into cationic photocrosslinking system and free radical photocrosslinking system according to the different triggering system. In addition, in order to further expand the light crosslinking application scope and improve the performance of light crosslinking product will light crosslinking with other crosslinking method combined with dual crosslinking system is in the constant research and exploration.
The cationic uv crosslinking system of photodecomposition crosslinking agent. Cationic photocrosslinking is a cation initiator that produces protonic acid or lewis acid under uv irradiation, forming a positive ion activity center, which causes cationic open-loop polymerization.
The first developed cationic initiator is diazonium salt, which can be decomposed by UV irradiation to generate the BF3 of lewis acid, which can directly induce cationic polymerization. It can also react with H2O or other compounds to produce proton H +, which is then initiated by protons. The disadvantage of diazo salt initiator is that the photosolution has N2 precipitation, which restricts the thick film cross-linking and cannot be stored for long time.
Peng Changzheng and others create A variety of three aryl sulfur six fluorine antimonate, as light initiator studied poly (methyl siloxane epoxy (EPS) and bisphenol A epoxy resin E - 44 cationic light crosslinking speed of influencing factors. The results showed that the structure, concentration, anthracene, phenol, thiazine and other sensitizers had different effects on the speed of photocrosslinking.
Crosslinking speed can be obtained in this way, mechanical properties, good light crosslinking component, and has caused obvious active polymerization after crosslinking features, available light crosslinking adhesive, sealing materials, coatings, electrical insulating materials and electronic element encapsulating material and so on.
The crosslinking mechanism is: the absorb certain wavelengths of uv energy three aryl sulfur six fluorine antimonate excited state will be further broken down to generate free HSbF6 hexafluoroantimonate, H + SbF6 - for the lively Bronsted acid, easy dissociation of H +, triggering polyfunctional epoxy prepolymer for cationic ring-opening polymerization, and ultimately pay couplet body polymer.
The crosslinking process can be achieved simultaneously through the chain growth of the oxygen ion and the carbon ion 2 active centers. The disadvantage of this initiator is that the metal ion SbF6, which contains highly toxic, is poor in solubility and low thermal stability in polysiloxane. Using boron instead of antimony can reduce toxicity and maintain high activity.
Chinese name: Diethyl toluene diamine(DETDA)Diethyltoluenediamine Raw material ：
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
A reagent grade additives
In addition, the current three-component system ketone - amine - onium or ketone - amine bromide can overcome the termination reaction of the active particles and raise the activity.
Free radical cation hybrid optical crosslinking system. Against free radical crosslinking and cationic light crosslinking of the respective characteristics of free radical, cationic hybrid light crosslinking system can complement each other, give full play to the advantages of the two, which broadens the light crosslinking system using range.
Now often will acrylate free radical crosslinking system and epoxide cationic light of crosslinking system with hybrid system, epoxide join can reduce system crosslinking shrinkage rate, so as to reduce the internal stress and enhance the adhesion performance, but it will reduce the speed of crosslinking system; Increasing the content of acrylate can increase the crosslinking speed and solvent resistance of the system, but increase the systolic rate of the system and reduce the adhesion of the substrate.
Therefore, different hybrid systems can be obtained by changing the ratio of acrylates and epoxides to meet the different requirements for the performance of crosslinked products. For example, with CY179 alicyclic epoxy resin, caprolactone three aryl sulfur Weng ternary alcohol, salt, diphenyl ketone and acrylic ester monomer mixture mixed light crosslinking system in crosslinked with fast speed, good solvent resistance at the same time, with low volume shrinkage ratio, be used for stereo lithography in satisfactory results were obtained.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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