News Details
The influence of coating crosslinking agent on crosslinking
2017-8-1 17:00:43
The influence of coating crosslinking agent on crosslinking
In order to improve the construction progress, and the stability of the subsequent product performance, we always hope that we always hope that the resin will be complete as soon as possible. For resins with a certain reaction activity, the effect of crosslinking agent on crosslinking is reflected in the crosslinking speed of the resin and the degree of crosslinking.
Through theory and practice, we summarized the influence of crosslinking agent on crosslinking
1. The amount of crosslinking agent should be sufficient to ensure sufficient exothermic peak temperature to achieve high crosslinking degree. (the amount of crosslinking agents may not result in permanent uncouplets.)
2. Under high ambient temperature, the amount of accelerator can be reduced appropriately to get enough gel time and complete crosslinking degree.
3, general promoting agent and crosslinking agent (peroxide) mole ratio must be less than 1, (this is only in the case of selecting cobalt salt as promoter to calculate), otherwise the promoter and the primary free radical resistance speed will be greater than the primary free radicals caused the speed of monomer, the results make conversion rate drops. Therefore, too much use of accelerant does not achieve the effect of accelerating crosslinking, but will decrease the performance of the product.
4. The crosslinking system for low reactive unsaturated polyester resins should be selected for low active crosslinking.
5. The composite crosslinking system can be adopted under adverse cross-linking conditions of low temperature or high humidity.
Methyl ethyl ketone 1 %
N, N - dimethyl aniline 0.5%
Benzoyl peroxide 2%
The principle of cross-linking is: sufficient amount of crosslinking agent and appropriate promoter.
The influence of construction environment on resin crosslinking. The construction environment has great influence on the crosslinking of the resin. The higher the environmental temperature during the construction, the shorter the gelation and crosslinking time. Sometimes the construction temperature 10 ℃, can make the gel time shorten nearly 1/2. If the temperature of the construction environment is too low, it is easy to cause permanent uncouplets.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Raw material ：
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
In order to improve the construction progress, and the stability of the subsequent product performance, we always hope that we always hope that the resin will be complete as soon as possible. For resins with a certain reaction activity, the effect of crosslinking agent on crosslinking is reflected in the crosslinking speed of the resin and the degree of crosslinking.
Through theory and practice, we summarized the influence of crosslinking agent on crosslinking
1. The amount of crosslinking agent should be sufficient to ensure sufficient exothermic peak temperature to achieve high crosslinking degree. (the amount of crosslinking agents may not result in permanent uncouplets.)
2. Under high ambient temperature, the amount of accelerator can be reduced appropriately to get enough gel time and complete crosslinking degree.
3, general promoting agent and crosslinking agent (peroxide) mole ratio must be less than 1, (this is only in the case of selecting cobalt salt as promoter to calculate), otherwise the promoter and the primary free radical resistance speed will be greater than the primary free radicals caused the speed of monomer, the results make conversion rate drops. Therefore, too much use of accelerant does not achieve the effect of accelerating crosslinking, but will decrease the performance of the product.
4. The crosslinking system for low reactive unsaturated polyester resins should be selected for low active crosslinking.
5. The composite crosslinking system can be adopted under adverse cross-linking conditions of low temperature or high humidity.
Methyl ethyl ketone 1 %
N, N - dimethyl aniline 0.5%
Benzoyl peroxide 2%
The principle of cross-linking is: sufficient amount of crosslinking agent and appropriate promoter.
The influence of construction environment on resin crosslinking. The construction environment has great influence on the crosslinking of the resin. The higher the environmental temperature during the construction, the shorter the gelation and crosslinking time. Sometimes the construction temperature 10 ℃, can make the gel time shorten nearly 1/2. If the temperature of the construction environment is too low, it is easy to cause permanent uncouplets.
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
Because resin at low temperature, although able to gelation, but the gel formation of macromolecular cannot move, as there were not enough exothermic peak temperature caused by crosslinking agent release of free radicals, constantly make chain crosslinking reaction is not easy, eventually lead to permanent non-delivery.
General requirements construction temperature is not lower than 15 ℃, relative humidity is not greater than 80%. In order to make the resin full crosslinking, it is best to make the crosslinking after forming.
After cross-linking processing method: under 40 ℃ for 2 hours, 2 hours under 60 ℃, 80 ℃ under four hours for processing, (if there are conditions can be in 100-100 ℃ with better effect to 2 hours) and then put into use after 24 hours at room temperature curing. If the construction unit has no heat treatment conditions, it can be maintained for one month after the construction. (when the environment is low, the curing time should be extended appropriately. This is especially important for the resin crosslinking for corrosion resistance.
Ambient temperature directly affects the speed of peroxide produce free radicals, by heating to crosslinking agent release free radicals that cause resin crosslinking, this process is feasible, of course, but high temperature operation may cause some inconvenience.
Further found that some organic peroxide as a result, people can use to activate another compounds, they usually work by oxidation - reduction reaction, do not need to heat up, at ambient temperature can crack produce free radicals. The substance that can activate oxides at ambient temperatures is the promoter or the accelerant or activator.
The definition of accelerant is that the promoter is the substance that causes the crosslinking agent to form a free radical (i.e., room temperature crosslinking) at its critical temperature.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Because resin at low temperature, although able to gelation, but the gel formation of macromolecular cannot move, as there were not enough exothermic peak temperature caused by crosslinking agent release of free radicals, constantly make chain crosslinking reaction is not easy, eventually lead to permanent non-delivery.
General requirements construction temperature is not lower than 15 ℃, relative humidity is not greater than 80%. In order to make the resin full crosslinking, it is best to make the crosslinking after forming.
After cross-linking processing method: under 40 ℃ for 2 hours, 2 hours under 60 ℃, 80 ℃ under four hours for processing, (if there are conditions can be in 100-100 ℃ with better effect to 2 hours) and then put into use after 24 hours at room temperature curing. If the construction unit has no heat treatment conditions, it can be maintained for one month after the construction. (when the environment is low, the curing time should be extended appropriately. This is especially important for the resin crosslinking for corrosion resistance.
Ambient temperature directly affects the speed of peroxide produce free radicals, by heating to crosslinking agent release free radicals that cause resin crosslinking, this process is feasible, of course, but high temperature operation may cause some inconvenience.
Further found that some organic peroxide as a result, people can use to activate another compounds, they usually work by oxidation - reduction reaction, do not need to heat up, at ambient temperature can crack produce free radicals. The substance that can activate oxides at ambient temperatures is the promoter or the accelerant or activator.
The definition of accelerant is that the promoter is the substance that causes the crosslinking agent to form a free radical (i.e., room temperature crosslinking) at its critical temperature.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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