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Epoxy resin casting body paint crosslinking agent
2017-8-1 17:00:30
Epoxy resin casting body paint crosslinking agent
The effect of different crosslinking conditions on the mechanical properties of epoxy resin casting coating crosslinking agent is different.
Different crosslinking conditions of the epoxy resin casting body stretching, bending load - displacement curve, the study found in preliminary crosslinking reaction after the sample test load - displacement curve of the dispersion is bigger, then after high temperature crosslinking have good coincidence degree, the load - displacement can be concluded that crosslinking can make samples after achieve better mechanical homogeneity.
Observed from tensile load - displacement curve of 40 ℃, 10 h sample fracture directly without the yield stage, elongation at break of spline is 6.58%, is lower than other conditions of the several groups of data values, shows that this condition may have only formed the crosslinking temperature low reactant macromolecules of low molecular weight of couplet, not fully pay the couplet network structure.
The mechanical properties of epoxy resin casting body crosslinking agent were tested. By the average of the test data, it can be seen that the epoxy/conjoined in 40 ℃, 10 h + 70 ℃ for 3 h with various tensile, bending and compression strength and modulus of aggregate data is four groups of the optimal process conditions. This crosslinking agent is a mixture of aliphatic amine and aromatic amine and the main component of fatty amine.
In the case of low temperature, the permide reaction possesses the absolute advantage and there is a space resistance effect in the tertiary amine itself, which makes it difficult for the reaction system to fully form the crosslinking. In 40 ℃, 10 h after crosslinking and then to 70 ℃, 3 h after crosslinking measured tensile strength increased to 69.44 MPa, after high temperature crosslinking of macromolecular chain crosslinking, further makes between molecular chains together, improve the system of the crosslinking density. After 70 ℃ and 3 h after crosslinking the tensile strength, bending strength and compression strength is 40 ℃, respectively, 10 h crosslinking increased by 11.64%, 14.72% and 14.72%.
The epoxy resin casting body crosslinking agent is multivariate amine as the main body of the crosslinking agent, the first is the active hydrogen of primary amine and epoxy reaction itself generate secondary amine, further reaction with epoxy generated tertiary amine, finally to form crosslinked network structure. Primary amine, secondary amino is easy to react, tertiary amine with catalytic function because of the space steric hindrance to make in the crosslinking reaction at low temperature is generally "amino priority reaction with epoxy group, formed with less branched macromolecules, and tertiary amine is difficult to participate in the reaction.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
The effect of different crosslinking conditions on the mechanical properties of epoxy resin casting coating crosslinking agent is different.
Different crosslinking conditions of the epoxy resin casting body stretching, bending load - displacement curve, the study found in preliminary crosslinking reaction after the sample test load - displacement curve of the dispersion is bigger, then after high temperature crosslinking have good coincidence degree, the load - displacement can be concluded that crosslinking can make samples after achieve better mechanical homogeneity.
Observed from tensile load - displacement curve of 40 ℃, 10 h sample fracture directly without the yield stage, elongation at break of spline is 6.58%, is lower than other conditions of the several groups of data values, shows that this condition may have only formed the crosslinking temperature low reactant macromolecules of low molecular weight of couplet, not fully pay the couplet network structure.
The mechanical properties of epoxy resin casting body crosslinking agent were tested. By the average of the test data, it can be seen that the epoxy/conjoined in 40 ℃, 10 h + 70 ℃ for 3 h with various tensile, bending and compression strength and modulus of aggregate data is four groups of the optimal process conditions. This crosslinking agent is a mixture of aliphatic amine and aromatic amine and the main component of fatty amine.
In the case of low temperature, the permide reaction possesses the absolute advantage and there is a space resistance effect in the tertiary amine itself, which makes it difficult for the reaction system to fully form the crosslinking. In 40 ℃, 10 h after crosslinking and then to 70 ℃, 3 h after crosslinking measured tensile strength increased to 69.44 MPa, after high temperature crosslinking of macromolecular chain crosslinking, further makes between molecular chains together, improve the system of the crosslinking density. After 70 ℃ and 3 h after crosslinking the tensile strength, bending strength and compression strength is 40 ℃, respectively, 10 h crosslinking increased by 11.64%, 14.72% and 14.72%.
The epoxy resin casting body crosslinking agent is multivariate amine as the main body of the crosslinking agent, the first is the active hydrogen of primary amine and epoxy reaction itself generate secondary amine, further reaction with epoxy generated tertiary amine, finally to form crosslinked network structure. Primary amine, secondary amino is easy to react, tertiary amine with catalytic function because of the space steric hindrance to make in the crosslinking reaction at low temperature is generally "amino priority reaction with epoxy group, formed with less branched macromolecules, and tertiary amine is difficult to participate in the reaction.
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.
At 70 ℃ crosslinking, owing to the high reaction temperature, molecular motion violent reaction with "amino epoxy group priority level is reduced, primary amine reaction preferred molecular motion and under the condition of high temperature sharp reduced the space steric effect of tertiary amine, chain extension reaction and intermolecular crosslinking reaction at the same time, makes the macromolecular quickly into a shape network structure.
Rapid crosslinking with viscosity rise system, acting force between molecules without balance, the whole system internal stress is larger, mechanical dispersion of large samples, and as a result of the existence of internal stress makes the mechanical properties of a (40 ℃, 10 h) + (70 ℃, 3 h) test results.
Due to high temperature reaction system, the molecular weight uniformity is poorer, so (70 ℃, 3 h) + (80 ℃, 2 h) modulus is relatively low. Much milder reaction to 40 ℃ crosslinking between molecules, molecular weight distribution is uniform within the system, so after 70 ℃ and 3 h after crosslinking system fully crosslinking.
The epoxy resin system existence condition best cross-linking cross-linking, Tg epoxy value is not as the crosslinking temperature rises, after 70 ℃, 3 h crosslinking, Tg of crosslinking value of 79.69 ℃, when again after more than 80 degrees to its best of epoxy crosslinking scope in its Tg epoxy value reduced.
After completion of the preliminary cross-linked epoxy internal stress larger need higher temperature after crosslinking to reduce the internal stress of the system, through the tensile and bending load - displacement curve observation, crosslinked samples after a higher temperature load - displacement curve of dispersion is lesser, and mechanical homogeneity of samples is better.
As crosslinking agent system mixed with a small amount of aliphatic amine diversity as a mixture of aromatic amine, 40 ℃ when the room temperature crosslinking macromolecules with linear response is given priority to, cross-linking incomplete crosslinking system, and again after high temperature cross-linked molecular sufficient crosslinking branched. Chain reaction temperature 70 ℃ in the growth and macromolecular crosslinking simultaneously, molecular weight of the crosslinking reaction fast crosslinking system uniformity is poor, and after high temperature crosslinking macromolecules with many branch chain.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
At 70 ℃ crosslinking, owing to the high reaction temperature, molecular motion violent reaction with "amino epoxy group priority level is reduced, primary amine reaction preferred molecular motion and under the condition of high temperature sharp reduced the space steric effect of tertiary amine, chain extension reaction and intermolecular crosslinking reaction at the same time, makes the macromolecular quickly into a shape network structure.
Rapid crosslinking with viscosity rise system, acting force between molecules without balance, the whole system internal stress is larger, mechanical dispersion of large samples, and as a result of the existence of internal stress makes the mechanical properties of a (40 ℃, 10 h) + (70 ℃, 3 h) test results.
Due to high temperature reaction system, the molecular weight uniformity is poorer, so (70 ℃, 3 h) + (80 ℃, 2 h) modulus is relatively low. Much milder reaction to 40 ℃ crosslinking between molecules, molecular weight distribution is uniform within the system, so after 70 ℃ and 3 h after crosslinking system fully crosslinking.
The epoxy resin system existence condition best cross-linking cross-linking, Tg epoxy value is not as the crosslinking temperature rises, after 70 ℃, 3 h crosslinking, Tg of crosslinking value of 79.69 ℃, when again after more than 80 degrees to its best of epoxy crosslinking scope in its Tg epoxy value reduced.
After completion of the preliminary cross-linked epoxy internal stress larger need higher temperature after crosslinking to reduce the internal stress of the system, through the tensile and bending load - displacement curve observation, crosslinked samples after a higher temperature load - displacement curve of dispersion is lesser, and mechanical homogeneity of samples is better.
As crosslinking agent system mixed with a small amount of aliphatic amine diversity as a mixture of aromatic amine, 40 ℃ when the room temperature crosslinking macromolecules with linear response is given priority to, cross-linking incomplete crosslinking system, and again after high temperature cross-linked molecular sufficient crosslinking branched. Chain reaction temperature 70 ℃ in the growth and macromolecular crosslinking simultaneously, molecular weight of the crosslinking reaction fast crosslinking system uniformity is poor, and after high temperature crosslinking macromolecules with many branch chain.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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