News Details
EP low temperature paint crosslinking agent
2017-7-25 16:02:01
EP low temperature paint crosslinking agent
Under the condition of different synthetic EP series low temperature crosslinking agent, mixes them with EP, under different conditions, the initial setting time and completely crosslinking time test, and the crosslinking EP adhesive strength test.
Reaction temperature and reaction time on the properties of EP low temperature crosslinking agent affect the reaction temperature directly affects the reaction degree of condensation amine, viscosity and properties of high temperature, reaction, condensation amine molecular chain expansion, easily lead to gel. The temperature is too low, the molecular chain grows slowly, the reaction time is long, the viscosity is small, the reaction is not complete. Experimental results show that control the reaction temperature (110 + 2) ℃, reaction time was 2.5 h is more appropriate.
At the same time, as the reaction temperature increases, the viscosity of the resultant products gradually increases, the initial time of coagulation and the total cross-linking time are shortened, and the shear strength increases. When the reaction temperature is consistent, the viscosity of the synthesized products increases with time and the initial coagulation time and crosslinking time are shortened, and the shear strength increases.
The reaction temperature is low, the reaction time is short, the viscosity of the compound is low, easy to mix with EP, but the free monomer concentration is high and the pungent odor is large. When the reaction temperature is high and the reaction time is long, the viscosity is large and the pungent smell is small, but when the viscosity is more than 10ps.s, it is difficult to mix with EP and not easy to use. The reaction temperature is too low, which is not conducive to the reaction of the reaction, but at the high temperature, it is easy to gel.
The influence of material ratio on the performance of crosslinking agent affects the degree of reaction, the degree of viscosity, the size of molecular weight and the number of active groups of the condensate. In the synthesis of low temperature and rapid crosslinking agent, the ratio of matter between polyformaldehyde and phenol is greater than 1, and the crosslinking agent has more active groups in the molecular chain. When the dosage ratio of the two is larger than 1.5, the contraction of the larger structure is formed. In this case, because of the resistance effect, it is unfavorable to the crosslinking of EP.
In order to ensure the response can adequately already, at the same time try to reduce redundant didn't take part in the reaction of monomer, fatty amine with paraformaldehyde amount of substance ratio of greater than 1 as far as possible, the amount of thiourea shall not exceed the amount of low molecular aliphatic amine.
Chinese name: Diethyl toluene diamine(DETDA)
Chinese alias: aryl, aryl diethyl - aryl - methyl-p-phenylenediamine
English name: Benzenediamine, ar, ar-diethyl-ar-methyl-English aliases:Diethyltoluenediamine; ar, ar-Diethyl-ar-methylbenzenediamine;Diethylmethylbenzenediamine;
CAS No. :68479-98-1
EINECS No. :270 -877-4
Molecular formula: C11H18N2
Molecular Weight: 178.28
Boiling point: 310 ℃
Refractive index: 1.581
Flash Point: > 140 ℃
Inchi: InChI = 1/C11H18N2/c1-4-8-6-7 (3) 10 (12) 11 (13) 9 (8) 5-2/h6H ,4-5,12-13H2 ,1-3H3 density : 1.022
Risk Codes: R10; R35
RIDADR: UN 3082
Safety instructions: S2; S26; S39; S61
Packing Group: III
Under the condition of different synthetic EP series low temperature crosslinking agent, mixes them with EP, under different conditions, the initial setting time and completely crosslinking time test, and the crosslinking EP adhesive strength test.
Reaction temperature and reaction time on the properties of EP low temperature crosslinking agent affect the reaction temperature directly affects the reaction degree of condensation amine, viscosity and properties of high temperature, reaction, condensation amine molecular chain expansion, easily lead to gel. The temperature is too low, the molecular chain grows slowly, the reaction time is long, the viscosity is small, the reaction is not complete. Experimental results show that control the reaction temperature (110 + 2) ℃, reaction time was 2.5 h is more appropriate.
At the same time, as the reaction temperature increases, the viscosity of the resultant products gradually increases, the initial time of coagulation and the total cross-linking time are shortened, and the shear strength increases. When the reaction temperature is consistent, the viscosity of the synthesized products increases with time and the initial coagulation time and crosslinking time are shortened, and the shear strength increases.
The reaction temperature is low, the reaction time is short, the viscosity of the compound is low, easy to mix with EP, but the free monomer concentration is high and the pungent odor is large. When the reaction temperature is high and the reaction time is long, the viscosity is large and the pungent smell is small, but when the viscosity is more than 10ps.s, it is difficult to mix with EP and not easy to use. The reaction temperature is too low, which is not conducive to the reaction of the reaction, but at the high temperature, it is easy to gel.
The influence of material ratio on the performance of crosslinking agent affects the degree of reaction, the degree of viscosity, the size of molecular weight and the number of active groups of the condensate. In the synthesis of low temperature and rapid crosslinking agent, the ratio of matter between polyformaldehyde and phenol is greater than 1, and the crosslinking agent has more active groups in the molecular chain. When the dosage ratio of the two is larger than 1.5, the contraction of the larger structure is formed. In this case, because of the resistance effect, it is unfavorable to the crosslinking of EP.
In order to ensure the response can adequately already, at the same time try to reduce redundant didn't take part in the reaction of monomer, fatty amine with paraformaldehyde amount of substance ratio of greater than 1 as far as possible, the amount of thiourea shall not exceed the amount of low molecular aliphatic amine.
Chinese name: Diethyl toluene diamine(DETDA)
Chinese alias: aryl, aryl diethyl - aryl - methyl-p-phenylenediamine
English name: Benzenediamine, ar, ar-diethyl-ar-methyl-English aliases:Diethyltoluenediamine; ar, ar-Diethyl-ar-methylbenzenediamine;Diethylmethylbenzenediamine;
CAS No. :68479-98-1
EINECS No. :270 -877-4
Molecular formula: C11H18N2
Molecular Weight: 178.28
Boiling point: 310 ℃
Refractive index: 1.581
Flash Point: > 140 ℃
Inchi: InChI = 1/C11H18N2/c1-4-8-6-7 (3) 10 (12) 11 (13) 9 (8) 5-2/h6H ,4-5,12-13H2 ,1-3H3 density : 1.022
Risk Codes: R10; R35
RIDADR: UN 3082
Safety instructions: S2; S26; S39; S61
Packing Group: III
Hazard Class: 6.1
The polymerized formaldehyde was increased, the initial time was shortened, and the time was shortened. The amount of fatty amine increased, the initial coagulation time was short, and the total cross-linking time was shortened accordingly. When polyformaldehydehyde and fatty amine add more than a certain range, in the synthesis process the viscosity increases sharply, even gelation phenomenon.
The addition of thiourea significantly increased the crosslinking speed of crosslinking agent, but the amount of thiourea added was too much, the crosslinking material was brittle and large, the mechanical properties were low, and the adhesion was poor. When phenol: polyparaformaldehyde: diethylenetriamine: the amount of the substance of thiourea is 1:1.25:1.1.1.1, the composition of the crosslinking agent viscosity is moderate, the EP crosslinking time is short, the shear strength is high.
The influence of DMP - 30 promoters on the performance of crosslinked EP was listed in table 3. It can be seen from table 3 that, at the time of not adding DMP - 30, the initial setting speed and complete crosslinking time were longer, with the increase of DMP - 30 addition, the initial setting time and crosslinking time were shortened, and the shear strength increased. When DMP - 30 is added to a certain amount,
With the increase of its addition, the crosslinking material brittleness increases, the shear strength drops sharply. The results show that the EP performance is best when DMP - 30 quality is 5%.
The low temperature active groups of phenol hydroxyl group, CS group and NH group were introduced in EP low temperature crosslinking agent, which can greatly improve the low-temperature reaction activity of crosslinking agent.
EP optimum synthesis conditions of low temperature crosslinking agent as follows: reaction temperature (110 + 2) ℃, the reaction time of 2.5 h.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
The polymerized formaldehyde was increased, the initial time was shortened, and the time was shortened. The amount of fatty amine increased, the initial coagulation time was short, and the total cross-linking time was shortened accordingly. When polyformaldehydehyde and fatty amine add more than a certain range, in the synthesis process the viscosity increases sharply, even gelation phenomenon.
The addition of thiourea significantly increased the crosslinking speed of crosslinking agent, but the amount of thiourea added was too much, the crosslinking material was brittle and large, the mechanical properties were low, and the adhesion was poor. When phenol: polyparaformaldehyde: diethylenetriamine: the amount of the substance of thiourea is 1:1.25:1.1.1.1, the composition of the crosslinking agent viscosity is moderate, the EP crosslinking time is short, the shear strength is high.
The influence of DMP - 30 promoters on the performance of crosslinked EP was listed in table 3. It can be seen from table 3 that, at the time of not adding DMP - 30, the initial setting speed and complete crosslinking time were longer, with the increase of DMP - 30 addition, the initial setting time and crosslinking time were shortened, and the shear strength increased. When DMP - 30 is added to a certain amount,
With the increase of its addition, the crosslinking material brittleness increases, the shear strength drops sharply. The results show that the EP performance is best when DMP - 30 quality is 5%.
The low temperature active groups of phenol hydroxyl group, CS group and NH group were introduced in EP low temperature crosslinking agent, which can greatly improve the low-temperature reaction activity of crosslinking agent.
EP optimum synthesis conditions of low temperature crosslinking agent as follows: reaction temperature (110 + 2) ℃, the reaction time of 2.5 h.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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