News Details
Classification of epoxy coating crosslinking agent
2017-4-27 11:52:48
Classification of epoxy coating crosslinking agent.The crosslinking temperature of various crosslinking agents is different, and the heat resistance of crosslinking is very different.Generally speaking, the crosslinking agent with high temperature of crosslinking can be obtained by the high heat resistant crosslinking.For addition polymerization crosslinking agent, crosslinking temperature and the heat resistance increase in the following order: aliphatic polyamine < alicyclic amine more phenolic < < more aromatic amine material anhydride.
The heat resistance of catalytic polymerization is generally at the level of aromatic polyamine.Type anionic polymerization (tertiary amine and imidazole compounds), cationic polymerization (BF3 complex) heat resistance is basically the same, this is mainly from the reaction mechanism is different, but in the end all the reticular structure of ether bond.
The crosslinking reaction is the chemical reaction, the interlinked temperature influences a lot, the temperature increases, the reaction speed increases, the gel time gets shorter;Gel time of numerical value with the crosslinking temperature rise sharply declining trend, but the crosslinking temperature is too high, often makes crosslinking performance, so the existence of the crosslinking temperature limit;The temperature of the crosslinking speed and the performance of the crosslinked properties must be chosen as the appropriate crosslinking temperature.
The crosslinking agent can be divided into four types: low temperature crosslinking agent temperature under room temperature;Room temperature cross-linking agent crosslinking temperature to room temperature ~ 50 ℃;Medium temperature crosslinking agent is 50 ~ 100 ℃;High temperature cross-linking agent crosslinking temperature above 100 ℃.Low temperature crosslinked crosslinking agent varieties are very few, and there are polyacrylate, polyisocyanate, etc.Domestic production of T - 31 of modified amine, YH - 82 modified amine under 0 ℃ crosslinking.
There are many types of crosslinking at room temperature: fatty polyamines and fatty polyamine.Low molecular polyamide and modified aromatic amine.Some of the lipids are polyamine, tertiary, squinazole and boron trifluoride.The high temperature crosslinking agent has aromatic polyamine, acetic anhydride, methylphenolic resin, amino resins, cyanamide and acylhydrazine.
For high temperature crosslinking system, crosslinking temperature is generally divided into two stages, using low temperature crosslinking, in front of the gel in gel or a bit higher than the gel state of the state, after high temperature heating again after crosslinking (post - cure), relative period before hand in the middle to prepay (pre - cure).
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.
Epoxy resins must be reactive with the crosslinking agent in order to produce a three-dimensional structure that has practical value.Therefore, the structure and quality of crosslinking agent will directly affect the application effect of epoxy resin.The research and development of crosslinking agent is far more active than epoxy resin, and the crosslinking agent is more and more secure than the epoxy variety.
Each working on a new crosslinking agent can solve a problem, is equivalent to the development of a new epoxy resin or opens up a new USES epoxy resin.The development of new crosslinking agents is far more important than developing new epoxy resins.
Since the 1990s, there have been many new features of the development trend of the world epoxy-resin crosslinking agent, mainly in the following aspects.
Crosslinking agent type
There are new varieties, the amines are the first, followed by the acid anhydride.
The "semi-inorganic macromolecules", including P, Si, B, F, Mg, etc., attract attention to their unique performance.
The modified mercaptan and modified phenol crosslinking agent have different degrees of development.The new, embedded copolymer with a mercaptan base at the end is heavily marketed.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
The heat resistance of catalytic polymerization is generally at the level of aromatic polyamine.Type anionic polymerization (tertiary amine and imidazole compounds), cationic polymerization (BF3 complex) heat resistance is basically the same, this is mainly from the reaction mechanism is different, but in the end all the reticular structure of ether bond.
The crosslinking reaction is the chemical reaction, the interlinked temperature influences a lot, the temperature increases, the reaction speed increases, the gel time gets shorter;Gel time of numerical value with the crosslinking temperature rise sharply declining trend, but the crosslinking temperature is too high, often makes crosslinking performance, so the existence of the crosslinking temperature limit;The temperature of the crosslinking speed and the performance of the crosslinked properties must be chosen as the appropriate crosslinking temperature.
The crosslinking agent can be divided into four types: low temperature crosslinking agent temperature under room temperature;Room temperature cross-linking agent crosslinking temperature to room temperature ~ 50 ℃;Medium temperature crosslinking agent is 50 ~ 100 ℃;High temperature cross-linking agent crosslinking temperature above 100 ℃.Low temperature crosslinked crosslinking agent varieties are very few, and there are polyacrylate, polyisocyanate, etc.Domestic production of T - 31 of modified amine, YH - 82 modified amine under 0 ℃ crosslinking.
There are many types of crosslinking at room temperature: fatty polyamines and fatty polyamine.Low molecular polyamide and modified aromatic amine.Some of the lipids are polyamine, tertiary, squinazole and boron trifluoride.The high temperature crosslinking agent has aromatic polyamine, acetic anhydride, methylphenolic resin, amino resins, cyanamide and acylhydrazine.
For high temperature crosslinking system, crosslinking temperature is generally divided into two stages, using low temperature crosslinking, in front of the gel in gel or a bit higher than the gel state of the state, after high temperature heating again after crosslinking (post - cure), relative period before hand in the middle to prepay (pre - cure).
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.
Epoxy resins must be reactive with the crosslinking agent in order to produce a three-dimensional structure that has practical value.Therefore, the structure and quality of crosslinking agent will directly affect the application effect of epoxy resin.The research and development of crosslinking agent is far more active than epoxy resin, and the crosslinking agent is more and more secure than the epoxy variety.
Each working on a new crosslinking agent can solve a problem, is equivalent to the development of a new epoxy resin or opens up a new USES epoxy resin.The development of new crosslinking agents is far more important than developing new epoxy resins.
Since the 1990s, there have been many new features of the development trend of the world epoxy-resin crosslinking agent, mainly in the following aspects.
Crosslinking agent type
There are new varieties, the amines are the first, followed by the acid anhydride.
The "semi-inorganic macromolecules", including P, Si, B, F, Mg, etc., attract attention to their unique performance.
The modified mercaptan and modified phenol crosslinking agent have different degrees of development.The new, embedded copolymer with a mercaptan base at the end is heavily marketed.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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