News Details
Ductile paint crosslinking agent
2017-7-19 16:21:34
Ductile paint crosslinking agent
In general, epoxy resins are more brittle after the crosslinking of the crosslinking, and the brittle and brittle epoxy resin is more prominent at low temperature. The non-active toughening agent will slowly volatilize the resin and make it brittle with time and light and heat. The reaction of the resin matrix changes its partial performance, so the synthetic toughness crosslinking agent has a certain significance.
Li qingxiu et al. used acid anhydride to react with a series of flexible chains of different molecular qualities, and successfully synthesized the ductile crosslinking agent.
The test showed that the ductile crosslinking agent had better compatibility with the epoxy resin, and the crosslinking reaction could be connected to the epoxy resin network with chemical bonds. Under the same dosage of crosslinking agent ratio, when the crosslinking agent in relative quality reaches a certain value, the flexible molecules will produce a synergistic effect on the mechanical properties of the epoxy resin, which at the same time of reducing tg, resistance to impact strength, tensile strength and bending strength at the same time appear peak.
Crosslinking the impact strength and tensile strength of content and content of crosslinking agent, the crosslinking agent of modified epoxy resin the impact strength higher than that of the unmodified many, when the crosslinking agent content is less than 40%, the impact strength increases with the increase of crosslinking agent content; When the content of crosslinking agent is greater than 40%, the impact strength is basically unchanged.
It is proved that the content of the crosslinking agent can improve the brittleness of epoxy resin effectively. The tensile strength decreased with the increase of crosslinking agent content, and the tensile strength decreased significantly after the content of crosslinking agent reached 50%. This is because with the increase of the flexible chain, the crosslinking density of epoxy resin has decreased somewhat.
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
In general, epoxy resins are more brittle after the crosslinking of the crosslinking, and the brittle and brittle epoxy resin is more prominent at low temperature. The non-active toughening agent will slowly volatilize the resin and make it brittle with time and light and heat. The reaction of the resin matrix changes its partial performance, so the synthetic toughness crosslinking agent has a certain significance.
Li qingxiu et al. used acid anhydride to react with a series of flexible chains of different molecular qualities, and successfully synthesized the ductile crosslinking agent.
The test showed that the ductile crosslinking agent had better compatibility with the epoxy resin, and the crosslinking reaction could be connected to the epoxy resin network with chemical bonds. Under the same dosage of crosslinking agent ratio, when the crosslinking agent in relative quality reaches a certain value, the flexible molecules will produce a synergistic effect on the mechanical properties of the epoxy resin, which at the same time of reducing tg, resistance to impact strength, tensile strength and bending strength at the same time appear peak.
Crosslinking the impact strength and tensile strength of content and content of crosslinking agent, the crosslinking agent of modified epoxy resin the impact strength higher than that of the unmodified many, when the crosslinking agent content is less than 40%, the impact strength increases with the increase of crosslinking agent content; When the content of crosslinking agent is greater than 40%, the impact strength is basically unchanged.
It is proved that the content of the crosslinking agent can improve the brittleness of epoxy resin effectively. The tensile strength decreased with the increase of crosslinking agent content, and the tensile strength decreased significantly after the content of crosslinking agent reached 50%. This is because with the increase of the flexible chain, the crosslinking density of epoxy resin has decreased somewhat.
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Flash Point°C161.1°C
In the past 10 years, microwave as the energy source in the preparation process of materials has attracted much attention. Compared with traditional heating, microwave has the advantages of heat transfer, high heating efficiency and easy control. There has been a lot of literature on the organic reaction system of microwave control, but is there a # microwave effect in the process of chemical reaction? There is no consensus on the non-thermal effect.
Microwave can also be used in polymer reaction system, and the microwave crosslinking reaction of epoxy resin has been reported extensively. Wei will be between bisphenol A (DGEBA) epoxy resin/phenylene diamine (mPDA), bisphenol A (DGEBA) epoxy resin/diamino diphenyl sulfone (DDS) two kinds of system of microwave crosslinking reaction compared with the traditional thermal crosslinking reaction, microwave crosslinking has higher reaction rate, tg and crosslinking product has obvious rise.
Marand and Graybeal studied the microwave crosslinking process of the DGEBA/DDS. In the early stage of the crosslinking reaction, the microwave could increase the reaction rate, but in the later stage, the reaction rate decreased and the crosslinking degree decreased.
Mijoric and Wijaya also studied the above system, but the rate of response rate and tg of crosslinking products decreased to varying degrees. Most of these studies directly compare the experience and product performance of microwave crosslinking and heat crosslinking, but the process is very different.
For the traditional heating, the energy depends on the temperature gradient of the surface of the material to be transferred gradually, and the microwave can heat the whole system evenly. Traditional heating available thermocouple temperature measurement directly, control the temperature and pressure in time, and in the microwave system to avoid thermocouple disturbing electromagnetic field, can only use fluorescent calorimeter indirect temperature measurement, temperature and pressure control has certain hysteresis; In addition, the space shape of the microwave container has a certain influence on the distribution of electromagnetic fields, and finally influences the reaction process itself. These differences may be the cause of the above report.
Baofu and Martin built pulse and continuous microwave power system of power, respectively, using the two kinds of system for the bisphenol A (DGEBA) epoxy resin with diamino diphenyl methane (DDM), m-phenylene diamine (mPDA), diamino diphenyl sulfone (DDS) three types of crosslinking agent isothermal crosslinking reaction at different temperatures.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
In the past 10 years, microwave as the energy source in the preparation process of materials has attracted much attention. Compared with traditional heating, microwave has the advantages of heat transfer, high heating efficiency and easy control. There has been a lot of literature on the organic reaction system of microwave control, but is there a # microwave effect in the process of chemical reaction? There is no consensus on the non-thermal effect.
Microwave can also be used in polymer reaction system, and the microwave crosslinking reaction of epoxy resin has been reported extensively. Wei will be between bisphenol A (DGEBA) epoxy resin/phenylene diamine (mPDA), bisphenol A (DGEBA) epoxy resin/diamino diphenyl sulfone (DDS) two kinds of system of microwave crosslinking reaction compared with the traditional thermal crosslinking reaction, microwave crosslinking has higher reaction rate, tg and crosslinking product has obvious rise.
Marand and Graybeal studied the microwave crosslinking process of the DGEBA/DDS. In the early stage of the crosslinking reaction, the microwave could increase the reaction rate, but in the later stage, the reaction rate decreased and the crosslinking degree decreased.
Mijoric and Wijaya also studied the above system, but the rate of response rate and tg of crosslinking products decreased to varying degrees. Most of these studies directly compare the experience and product performance of microwave crosslinking and heat crosslinking, but the process is very different.
For the traditional heating, the energy depends on the temperature gradient of the surface of the material to be transferred gradually, and the microwave can heat the whole system evenly. Traditional heating available thermocouple temperature measurement directly, control the temperature and pressure in time, and in the microwave system to avoid thermocouple disturbing electromagnetic field, can only use fluorescent calorimeter indirect temperature measurement, temperature and pressure control has certain hysteresis; In addition, the space shape of the microwave container has a certain influence on the distribution of electromagnetic fields, and finally influences the reaction process itself. These differences may be the cause of the above report.
Baofu and Martin built pulse and continuous microwave power system of power, respectively, using the two kinds of system for the bisphenol A (DGEBA) epoxy resin with diamino diphenyl methane (DDM), m-phenylene diamine (mPDA), diamino diphenyl sulfone (DDS) three types of crosslinking agent isothermal crosslinking reaction at different temperatures.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Spanish
French
Italian
Portuguese
Japanese
Korean
Arabic
Russian