News Details
Accelerator and paint crosslinking agent
2017-7-18 12:29:22
Accelerator and paint crosslinking agent
Promoters and crosslinking agents refer to a paste or solution that is formulated in accordance with the regulations. The amount of crosslinking agent is determined according to the number of free radicals required for the crosslinking reaction of the material.
The accelerant is determined by the temperature of the molding environment and the operation time of the producer. For example, the first Ⅰ kind of blending of cobalt naphthenate and available by about 4% in winter, the summer available around 1%.
The promoter is used to make organic peroxides form free radicals at room temperature. According to the dosage of the promoter, the crosslinking speed can be controlled artificially. Promoter has the nature of the reducing agent, basically make peroxide electron and reduction, itself loses electrons by oxidation, therefore, peroxide and promoter oxidation - reduction initiator system.
Action principle is to promote superoxide free radical formation, free radicals and make double bond open in resin and crosslinking agent, a chain reaction, and then respectively and form a new free radical, make growing a chain reaction, until peroxide run out.
In foreign countries, it is sometimes used to pre-add the promoter to the resin (the time is partially invalid), and it is only required to add the crosslinking agent when used. In order to simplify the ingredients procedure or other needs, it is ok to do so, but remember, the crosslinking agent can not be used in the resins in advance, otherwise it is easy to make the resin obsolete.
Note: when the ingredients may not be promoting agent, crosslinking agent and at the same time to join in the resin (promoting agent, crosslinking agent directly mixed combustion and explosion), it must be after adding accelerator and resin mix in crosslinking agent.
Initiator and promoter. In general, organic peroxides such as benzoyl peroxide, diisopropyl benzene, isopropyl benzene peroxide, cyclohexanone peroxide, etc. Attention should be paid to the characteristics of high critical temperature, long half-life and stable room temperature.
Chinese name: Diethyl toluene diamine(DETDA)
Promoters and crosslinking agents refer to a paste or solution that is formulated in accordance with the regulations. The amount of crosslinking agent is determined according to the number of free radicals required for the crosslinking reaction of the material.
The accelerant is determined by the temperature of the molding environment and the operation time of the producer. For example, the first Ⅰ kind of blending of cobalt naphthenate and available by about 4% in winter, the summer available around 1%.
The promoter is used to make organic peroxides form free radicals at room temperature. According to the dosage of the promoter, the crosslinking speed can be controlled artificially. Promoter has the nature of the reducing agent, basically make peroxide electron and reduction, itself loses electrons by oxidation, therefore, peroxide and promoter oxidation - reduction initiator system.
Action principle is to promote superoxide free radical formation, free radicals and make double bond open in resin and crosslinking agent, a chain reaction, and then respectively and form a new free radical, make growing a chain reaction, until peroxide run out.
In foreign countries, it is sometimes used to pre-add the promoter to the resin (the time is partially invalid), and it is only required to add the crosslinking agent when used. In order to simplify the ingredients procedure or other needs, it is ok to do so, but remember, the crosslinking agent can not be used in the resins in advance, otherwise it is easy to make the resin obsolete.
Note: when the ingredients may not be promoting agent, crosslinking agent and at the same time to join in the resin (promoting agent, crosslinking agent directly mixed combustion and explosion), it must be after adding accelerator and resin mix in crosslinking agent.
Initiator and promoter. In general, organic peroxides such as benzoyl peroxide, diisopropyl benzene, isopropyl benzene peroxide, cyclohexanone peroxide, etc. Attention should be paid to the characteristics of high critical temperature, long half-life and stable room temperature.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine packing： net weight 200KG/ galvanized iron drum (a small cabinet pallet loaded 16 tons), 1000KG/IB barrels (a small cabinet loaded 18 tons or 23 tons of ISOTANK).
Stimulants generally have transition metal soap (such as naphthenic acid cobalt), tertiary amines (such as dimethylphenylaniline), organic sulfur compounds (e.g., yethyl-carbamide). Promoter can be used alone can also use several kinds of common, joint should be chosen when using a promoter, relies on the rest of the promoter, the selection of initiator and accelerator, besides considering trigger crosslinking effect, should also pay attention to their strict effect on adhesive solution storage stability.
For acrylic acid, it can be used to clear residue of organic solvents such as acetone, toluene, dimethylformamide, etc.
For montmorillonite system, whether it is a water-soluble polymer crosslinker crosslinked alone or with CaO compound crosslinking, blank sample after crosslinking, associating the hydroxyl absorption peak relative to free hydroxyl absorption peak were significantly enhanced, and the crosslinking hydroxyl free sample alone by CaO absorption peak relatively less, especially the composite polymer crosslinker water-soluble soil and CaO crosslinking, associating the hydroxyl of absorption peak relatively enhanced more significantly, and 1000 in the original 1030 cm - 1200 - cm - 1-1 sio32 - absorption peak dispersion, supposedly with the new formation of the characteristics of Ca (OH) 2 infrared absorption and 1080 cm, 1180 cm - 1-1 shoulder peak overlap.
Causes of this phenomenon is due to the difficult to form a classic double bond between silicon and oxygen, so in all nonionic silicon oxides, oxygen is always with two different silicon atomic bonding, forming a long chain of silica or three-dimensional space truss. As for the high condensation of polysilicic acid, within the micro fine particles, probably close to - Si - O - Si - chain crosslinking, completely in the unsaturated granular appearance of oxygen, they can still accept protons, so that the particle surface is covered by SiOH weak acid base.
Lewis acid - amine ligand complex BF3, ZnCl2, SnCl2, PF5, SbF5 lewis acid, such as "extremely easily with the amine and secondary amine to form the corresponding lewis acid - amine complex compound, it is also a kind of stable under normal temperature, heating after the rapid decomposition of epoxy resin latent sexual coupling agent. The most representative of all is boron trifluoride - amine complex.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Stimulants generally have transition metal soap (such as naphthenic acid cobalt), tertiary amines (such as dimethylphenylaniline), organic sulfur compounds (e.g., yethyl-carbamide). Promoter can be used alone can also use several kinds of common, joint should be chosen when using a promoter, relies on the rest of the promoter, the selection of initiator and accelerator, besides considering trigger crosslinking effect, should also pay attention to their strict effect on adhesive solution storage stability.
For acrylic acid, it can be used to clear residue of organic solvents such as acetone, toluene, dimethylformamide, etc.
For montmorillonite system, whether it is a water-soluble polymer crosslinker crosslinked alone or with CaO compound crosslinking, blank sample after crosslinking, associating the hydroxyl absorption peak relative to free hydroxyl absorption peak were significantly enhanced, and the crosslinking hydroxyl free sample alone by CaO absorption peak relatively less, especially the composite polymer crosslinker water-soluble soil and CaO crosslinking, associating the hydroxyl of absorption peak relatively enhanced more significantly, and 1000 in the original 1030 cm - 1200 - cm - 1-1 sio32 - absorption peak dispersion, supposedly with the new formation of the characteristics of Ca (OH) 2 infrared absorption and 1080 cm, 1180 cm - 1-1 shoulder peak overlap.
Causes of this phenomenon is due to the difficult to form a classic double bond between silicon and oxygen, so in all nonionic silicon oxides, oxygen is always with two different silicon atomic bonding, forming a long chain of silica or three-dimensional space truss. As for the high condensation of polysilicic acid, within the micro fine particles, probably close to - Si - O - Si - chain crosslinking, completely in the unsaturated granular appearance of oxygen, they can still accept protons, so that the particle surface is covered by SiOH weak acid base.
Lewis acid - amine ligand complex BF3, ZnCl2, SnCl2, PF5, SbF5 lewis acid, such as "extremely easily with the amine and secondary amine to form the corresponding lewis acid - amine complex compound, it is also a kind of stable under normal temperature, heating after the rapid decomposition of epoxy resin latent sexual coupling agent. The most representative of all is boron trifluoride - amine complex.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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