News Details
Light-activated paint crosslinker
2017-7-10 16:30:48
Light-activated paint crosslinker agent is a photosensitizing compound, and the light-activated crosslinking agent is very stable in the absence of light, and upon exposure to ultraviolet light, the active group is produced to initiate the polymerization and cross-linking of the epoxy resin.
In the study of photoinitiated radical polymerization for more than 50 years, photoinitiators can absorb light of appropriate wavelength and intensity and cause photophysical processes to a certain excited state. When the energy exceeds the bond energy, the primary free radicals , Is a consumptive physical change process.
And the photosensitizer absorbs light to the photophysical process to a certain excited state, the occurrence of molecular or intermolecular energy transfer or hydrogen recovery reaction, the energy transfer to the monomer or photoinitiator can also produce primary free radicals, Non-expendable and does not change the structure of the energy transfer process. Primary free radicals can lead to polymerization of heterocyclic compounds such as rich electrons and epoxies. However, a common problem in photoinduced free radical polymerization is their anaerobic properties, which are susceptible to oxygen in the air. More than 20 years of light-induced cationic polymerization initiator development has made important progress.
In addition to the general metal halides such as dicyclopentadienyl titanium dichloride, Fu Shi catalyst, the current development and use of the main aromatic diazonium salt, diaryl iodide compounds and triaryl sulfonium compounds, They are highly sensitive, their activity and light wavelength and intensity, but the temperature is not sensitive, with good thermal stability.
It is not blocked by oxygen, when the system does not exist impurities, the reaction process shows a general anionic polymerization or cationic polymerization of active polymer characteristics, such as boron tetrafluoride anion (BF4) or PF6-, AsF6- and SbF6- and other triaryl sulfonium salts in the ultraviolet light irradiation (absorb 250 nm wavelength light) lead to the epoxy compound cationic polymerization process that has this feature.
Some studies have shown that some commonly used photosensitizers such as anthracene, pyrene, phenothiazine and so have the role of promoting the decomposition of such photosensitive crosslinking agent, not only directly affect the product gelation and crosslinking speed, but also can make it near Ultraviolet wavelength region (300 ~ 450nm) to absorb the weak defects are improved, can effectively lead to polymerization of epoxides.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
In the study of photoinitiated radical polymerization for more than 50 years, photoinitiators can absorb light of appropriate wavelength and intensity and cause photophysical processes to a certain excited state. When the energy exceeds the bond energy, the primary free radicals , Is a consumptive physical change process.
And the photosensitizer absorbs light to the photophysical process to a certain excited state, the occurrence of molecular or intermolecular energy transfer or hydrogen recovery reaction, the energy transfer to the monomer or photoinitiator can also produce primary free radicals, Non-expendable and does not change the structure of the energy transfer process. Primary free radicals can lead to polymerization of heterocyclic compounds such as rich electrons and epoxies. However, a common problem in photoinduced free radical polymerization is their anaerobic properties, which are susceptible to oxygen in the air. More than 20 years of light-induced cationic polymerization initiator development has made important progress.
In addition to the general metal halides such as dicyclopentadienyl titanium dichloride, Fu Shi catalyst, the current development and use of the main aromatic diazonium salt, diaryl iodide compounds and triaryl sulfonium compounds, They are highly sensitive, their activity and light wavelength and intensity, but the temperature is not sensitive, with good thermal stability.
It is not blocked by oxygen, when the system does not exist impurities, the reaction process shows a general anionic polymerization or cationic polymerization of active polymer characteristics, such as boron tetrafluoride anion (BF4) or PF6-, AsF6- and SbF6- and other triaryl sulfonium salts in the ultraviolet light irradiation (absorb 250 nm wavelength light) lead to the epoxy compound cationic polymerization process that has this feature.
Some studies have shown that some commonly used photosensitizers such as anthracene, pyrene, phenothiazine and so have the role of promoting the decomposition of such photosensitive crosslinking agent, not only directly affect the product gelation and crosslinking speed, but also can make it near Ultraviolet wavelength region (300 ~ 450nm) to absorb the weak defects are improved, can effectively lead to polymerization of epoxides.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
The product is identical to Ethancure 100 and Lonza DETDA 80, DETDA is very effective polyurethane elastomer chain extender; also be used as polyurethane and epoxy resin curing agent, epoxy resin of an antioxidant, industrial oils and lubricants . In addition, also as intermediates in organic synthesis.Especially for the RIM (reaction injection molding), is important in the field of spray polyurea chain extender species. Also can be used for casting polyurethane elastomer (CPU) and a curing agent, epoxy curing agent, epoxy resin of antioxidants, lubricants and industrial oils other antioxidants.
And so on in the synthesis of fiber supporting materials in the synthesis of hexafluoroantimonate triarylsulfonium salt in the cationic cationic photo-crosslinking behavior of the study also found that the photosensitizer has to promote crosslinking agent to improve the photo-crosslinking The speed of the role.
As a single component epoxy resin adhesive is convenient to apply, environmentally friendly, energy efficient and increasingly widely used, light-activated cross-linking agent research and development are also making progress. The use of one-component epoxy adhesives with wet-sensitive latent cross-linking agents has achieved good results in the field of civil construction of precast concrete components and other wet working surfaces.
One-component epoxy adhesives containing thermosensitive latent crosslinking agents are also well used in the field of electronic components, rapid assembly of devices and other precision instruments. Automatic bonding of new technology lines are also advancing. But the optimization of molecular design, the effective modification of the existing cross-linking agent, research and development can adapt to the new process, good stability, can effectively control the cross-linking temperature and crosslinking speed of new varieties is still the focus of research and development.
In order to further study the influence of the structure and reaction properties of latent crosslinking agent on the cross-linking behavior of epoxy rubber and the comprehensive performance of crosslinked materials and the process control factors, it is expected to further improve the existing water resistance, insufficient heat and moisture resistance and toughening The
Wang Xiaoyu et al. [The latent epoxy resin crosslinking agent synthesized by the reaction of methyl acrylate and ethylenediamine can not only have low viscosity and good storage at room temperature. In the middle and high temperature crosslinking, it can decompose the methyl acrylate monomer and Polymerization, so that the system eventually formed semi-interpenetrating polymer network structure, and is expected to improve the toughness of epoxy resin.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
And so on in the synthesis of fiber supporting materials in the synthesis of hexafluoroantimonate triarylsulfonium salt in the cationic cationic photo-crosslinking behavior of the study also found that the photosensitizer has to promote crosslinking agent to improve the photo-crosslinking The speed of the role.
As a single component epoxy resin adhesive is convenient to apply, environmentally friendly, energy efficient and increasingly widely used, light-activated cross-linking agent research and development are also making progress. The use of one-component epoxy adhesives with wet-sensitive latent cross-linking agents has achieved good results in the field of civil construction of precast concrete components and other wet working surfaces.
One-component epoxy adhesives containing thermosensitive latent crosslinking agents are also well used in the field of electronic components, rapid assembly of devices and other precision instruments. Automatic bonding of new technology lines are also advancing. But the optimization of molecular design, the effective modification of the existing cross-linking agent, research and development can adapt to the new process, good stability, can effectively control the cross-linking temperature and crosslinking speed of new varieties is still the focus of research and development.
In order to further study the influence of the structure and reaction properties of latent crosslinking agent on the cross-linking behavior of epoxy rubber and the comprehensive performance of crosslinked materials and the process control factors, it is expected to further improve the existing water resistance, insufficient heat and moisture resistance and toughening The
Wang Xiaoyu et al. [The latent epoxy resin crosslinking agent synthesized by the reaction of methyl acrylate and ethylenediamine can not only have low viscosity and good storage at room temperature. In the middle and high temperature crosslinking, it can decompose the methyl acrylate monomer and Polymerization, so that the system eventually formed semi-interpenetrating polymer network structure, and is expected to improve the toughness of epoxy resin.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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