News Details
The crosslinking time of coating crosslinking agent
2017-7-30 23:36:22
The crosslinking time of coating crosslinking agent
Diethyltoluenediamine Raw material ：
TDA industrial, Sichuan production
Ethylene (Et) polymer grade, Shanghai production
TEA industrial imports
The crosslinking time varies with monomer ratio. The crosslinking time of crosslinking agent can be seen with the change of the monomer ratio. The time of crosslinking is decreased with the increase of monomer feeding ratio.
When the monomer ratio was 3.13, the crosslinking agent was the least, the fastest. Combined with the test of contact Angle, it can be inferred that the monomer ratio is 3.13 ~ 3.30:1. The combined performance of the crosslinking agent is better.
Crosslinking agent in 3400160 and 1100 cm - 1 has strong absorption peak, and the only with point is in the synthesis temperature is 80 ℃, the triangle in the figure in the emergence of a smaller double absorption peak, peak attributable to the shoulders of primary amine gamma N - H.
Zao Ming and other people think that primary amine is beneficial to the crosslinking reaction of epoxy resin, when the primary amine and epoxy resin reaction, making the epoxy resin to generate secondary amine, secondary amine continue to react with epoxy group to generate tertiary amine, secondary amine and tertiary amine molecules in the epoxy groups and hydroxyl etherification reaction, finally generated huge mesh structure, the epoxy resin is not melting, with excellent performance.
Therefore, synthesis product of under 80 ℃, with good performance. Similar absorption peaks were also found in the study of optimal composition time and ratio.
Of thiourea modified divinyl three amine process for preparation of epoxy crosslinking agent was studied, and analyzed the synthesis reaction time, reaction temperature and monomer synthesis ingredient ratio on the crosslinking agent performance, and low temperature crosslinking agent was studied with epoxy cross-linking.
Crosslinking agent primary amine functional groups during the synthesis temperature 80 ℃, and it is beneficial to epoxy crosslinking reaction groups; The contact Angle of contact Angle measurement instrument is obtained: the contact Angle of crosslinking agent is presented with the change of the three variables, and the trend of the increase is decreased first.
Experiments show that the reaction time was 1.2 ~ 1.4 h, synthesis temperature for 80 + 5 ℃, divinyl three amine with thiourea quality ratio is 3.13 ~ 3.30:1, can be obtained to 12 ℃ under 24 h stated epoxy crosslinking agent at low temperature.
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
The time difference between crosslinking agent and epoxy resin mixed in reaction time is different. The time of crosslinking increases with the increase of the time of synthesis, and then increases the trend after decreasing. As the synthesis time increases, the crosslinking time is shortened, and the crosslinking agent is the fastest when the synthesis time is 1.2 ~ 1.4 h. The time of synthesis is increased, and the time of crosslinking increases. Synthesis time of 1.2 ~ 1.4 h is considered to be optimal.
The influence of the volume of monomer on the performance of crosslinking agent. The contact Angle of the contact Angle varies with the monomer ratio.
The contact Angle increases with the monomer feeding ratio, and then decreases with the increase of m (diethylene triamine) : m (thiourea) = 3.30:1 when the contact Angle is the smallest.
This is because the thiourea as a promoter of crosslinking reaction, the active hydrogen molecule is more, to be able to speed up the crosslinking of the epoxy resin, and the crosslinking material shear and peel strength also has a good effect. The dosage of thiourea is increased, the time of crosslinking is shortened, the mechanical strength is improved, but the time of application of crosslinking agent is also shortened, so the amount of thiourea is necessary.
The introduction of low poly formaldehyde in the synthesis of mannichyl-type crosslinking agent can be used to reduce the emission and reduce energy consumption. The production of T 1-31 crosslinking agent was introduced into the low poly - formaldehyde, and compared with the use of formaldehyde solution. Using 36 % formaldehyde solution, about 400 kg of waste water per ton of products produced, instead of production of low-poly formaldehyde, it also produced a ton of products with only about 100 kilograms of waste water.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Spanish
French
Italian
Portuguese
Japanese
Korean
Arabic
Russian