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The effect of crosslinking agent temperature on crosslinking speed
2017-7-31 17:27:42
The effect of crosslinking agent temperature on crosslinking speed
CYD2128 / LCA system to moderate such as non isothermal DSC curves can be seen that crosslinking system crosslinking speed is the highest temperature is 116 ℃. For resin crosslinking reaction, there are two ways to achieve a certain cross-linking degree: prolonged reaction time at low temperature or increased reaction temperature.
When the crosslinking degree is higher, the extension of crosslinking time is more effective. Crosslinking system under 60, 80, 100 and 80 ℃, the crosslinking time of 315 h, 42 min respectively, 18 min and 10 min and crosslinking system of low temperature activity and high temperature difference is very big activity and crosslinking agent has some latent. According to the reaction characteristics of the crosslinking system, we have determined the cross-linking condition of the crosslinking system.
The appearance of the tensile section was observed: scanning electron microscope (SEM, JEOL jsm-6700f) was observed in the sample section of the sample.
The influence of crosslinking temperature on the performance of cross - linking material properties. Epoxy crosslinking content on the mechanical properties, low temperature crosslinking (e.g., 60, 80 and 100 ℃) superiority of crosslinking content on the mechanical properties of high temperature crosslinking (such as 120 ℃) crosslinking content on the mechanical properties of 80 ℃ and crosslinking of crosslinking content has the best mechanical properties.
The reason may be that the crosslinking of high temperature crosslinking is more likely to produce internal stress and thus affect the mechanical properties of the material. 80 ℃ crosslinking crosslinking content on the mechanical properties of more than is widely used in the field of aeronautics and astronautics CYD2128 / crosslinking system mechanics performance of DDS, explain CYD2128/80 ℃ crosslinking of LCA material adapted to the field of aeronautics and astronautics.
CYD2128 / LCA at 80 ℃ the tensile strength of the crosslinked by crosslinking content with CYD2128 / DDS system is very close, but the bending strength and impact strength is much more better than CYD2128 / DDS system, showed the HBP to crosslinking have toughening effect.
Different epoxy crosslinking the loss tangent curve of things can get the crosslinking of glass transition temperature Tg CYD2128 / DDS crosslinking and under 60, 80, 100 and 80 ℃ CYD2128 / LCA of crosslinking Tg respectively 136151, 128168, 136120, 128168, 136120 ℃, explain CYD2128 / crosslinking and CYD2128 DDS/LCA of crosslinked at 80 ℃ heat performance is very similar.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
CYD2128 / LCA system to moderate such as non isothermal DSC curves can be seen that crosslinking system crosslinking speed is the highest temperature is 116 ℃. For resin crosslinking reaction, there are two ways to achieve a certain cross-linking degree: prolonged reaction time at low temperature or increased reaction temperature.
When the crosslinking degree is higher, the extension of crosslinking time is more effective. Crosslinking system under 60, 80, 100 and 80 ℃, the crosslinking time of 315 h, 42 min respectively, 18 min and 10 min and crosslinking system of low temperature activity and high temperature difference is very big activity and crosslinking agent has some latent. According to the reaction characteristics of the crosslinking system, we have determined the cross-linking condition of the crosslinking system.
The appearance of the tensile section was observed: scanning electron microscope (SEM, JEOL jsm-6700f) was observed in the sample section of the sample.
The influence of crosslinking temperature on the performance of cross - linking material properties. Epoxy crosslinking content on the mechanical properties, low temperature crosslinking (e.g., 60, 80 and 100 ℃) superiority of crosslinking content on the mechanical properties of high temperature crosslinking (such as 120 ℃) crosslinking content on the mechanical properties of 80 ℃ and crosslinking of crosslinking content has the best mechanical properties.
The reason may be that the crosslinking of high temperature crosslinking is more likely to produce internal stress and thus affect the mechanical properties of the material. 80 ℃ crosslinking crosslinking content on the mechanical properties of more than is widely used in the field of aeronautics and astronautics CYD2128 / crosslinking system mechanics performance of DDS, explain CYD2128/80 ℃ crosslinking of LCA material adapted to the field of aeronautics and astronautics.
CYD2128 / LCA at 80 ℃ the tensile strength of the crosslinked by crosslinking content with CYD2128 / DDS system is very close, but the bending strength and impact strength is much more better than CYD2128 / DDS system, showed the HBP to crosslinking have toughening effect.
Different epoxy crosslinking the loss tangent curve of things can get the crosslinking of glass transition temperature Tg CYD2128 / DDS crosslinking and under 60, 80, 100 and 80 ℃ CYD2128 / LCA of crosslinking Tg respectively 136151, 128168, 136120, 128168, 136120 ℃, explain CYD2128 / crosslinking and CYD2128 DDS/LCA of crosslinked at 80 ℃ heat performance is very similar.
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.
The inflection point of CYD2128 / LCA crosslinking is significantly higher than that of the CYD2128 / DDS crosslinking system, indicating that the heat resistance of the CYD2128 / LCA crosslinking system is superior to that of the CYD2128 / DDS system.
Fracture surface topography analysis. The SEM diagram of the crosslinking of epoxy resin shows that the morphology of CYD2128 / DDS crosslinking is very smooth, indicating that the brittle fracture occurred. CYD2128 / LCA crosslinking content section in 80 ℃ is very rough, there are obvious stripes break mark, showed that ductile fracture happened. It is shown that the addition of HBP significantly improves the toughness of the epoxy resin crosslinking.
Crosslinking temperature has important influence on the performance of crosslinked material, low temperature of crosslinking performance is better than that of high temperature of crosslinking performance, including CYD2 128/80 ℃ crosslinking LCA system has the best mechanical properties. The crosslinking agent with hyperbranched structure has some latent latent property, and it also significantly improves the toughness of the epoxy resin crosslinking.
CYD2128 / LCA system 80 ℃ crosslinking on the mechanical performance is better than the widely used in aerospace materials CYD2128 / DDS crosslinking performance, explain CYD2128/80 ℃ crosslinking LCA system has great potential applications in the field of aerospace.
When the temperature from room temperature to 115 ℃, the esterification reaction were quickly and hydroxyl methyl esterification rate has reached about 85%; When the reaction time was less than 2.5 h (toluene reflux stage), the hydroxymethyl esterification rate increased with the duration of reaction time. When acuity 2.5 h reaction time (soxhlet extractor dehydration stage), with the extension of reaction time, the hydroxyl methyl esterification rate is increasing, when the phases to 2.5 h, hydroxyl methyl esterification rate of 98%. The reaction time is not only easy to produce a side reaction, but also the production cost is correspondingly improved. Therefore, it is more suitable for the reaction time to choose the 2.5 h of the reflux separation water and 2.5 h for the soxler extractor.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
The inflection point of CYD2128 / LCA crosslinking is significantly higher than that of the CYD2128 / DDS crosslinking system, indicating that the heat resistance of the CYD2128 / LCA crosslinking system is superior to that of the CYD2128 / DDS system.
Fracture surface topography analysis. The SEM diagram of the crosslinking of epoxy resin shows that the morphology of CYD2128 / DDS crosslinking is very smooth, indicating that the brittle fracture occurred. CYD2128 / LCA crosslinking content section in 80 ℃ is very rough, there are obvious stripes break mark, showed that ductile fracture happened. It is shown that the addition of HBP significantly improves the toughness of the epoxy resin crosslinking.
Crosslinking temperature has important influence on the performance of crosslinked material, low temperature of crosslinking performance is better than that of high temperature of crosslinking performance, including CYD2 128/80 ℃ crosslinking LCA system has the best mechanical properties. The crosslinking agent with hyperbranched structure has some latent latent property, and it also significantly improves the toughness of the epoxy resin crosslinking.
CYD2128 / LCA system 80 ℃ crosslinking on the mechanical performance is better than the widely used in aerospace materials CYD2128 / DDS crosslinking performance, explain CYD2128/80 ℃ crosslinking LCA system has great potential applications in the field of aerospace.
When the temperature from room temperature to 115 ℃, the esterification reaction were quickly and hydroxyl methyl esterification rate has reached about 85%; When the reaction time was less than 2.5 h (toluene reflux stage), the hydroxymethyl esterification rate increased with the duration of reaction time. When acuity 2.5 h reaction time (soxhlet extractor dehydration stage), with the extension of reaction time, the hydroxyl methyl esterification rate is increasing, when the phases to 2.5 h, hydroxyl methyl esterification rate of 98%. The reaction time is not only easy to produce a side reaction, but also the production cost is correspondingly improved. Therefore, it is more suitable for the reaction time to choose the 2.5 h of the reflux separation water and 2.5 h for the soxler extractor.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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