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Crosslinking temperature of coating crosslinking agent
2017-8-22 11:41:12
Crosslinking temperature of coating crosslinking agent
The crosslinking temperature of various crosslinking agents is different, and the heat resistance of crosslinking is also very different.
In general, the crosslinking temperature of crosslinking agent can be obtained with high heat resistance and excellent crosslinking. In addition, the crosslinking temperature and heat resistance of crosslinking agent are increased in the following order: fatty polyamine (polyamine) < aliphatic polyamine (polyamine).
The heat resistance of the catalytic polymer crosslinking agent is generally in the level of aromatic polyamines. 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 a chemical reaction. It is affected by the crosslinking temperature, the temperature increases, the reaction speed is accelerated and the gel time is shortened. The time of gelation is generally decreasing with the increase of crosslinking temperature, but the crosslinking temperature is too high, and the performance of crosslinking is often reduced, so the upper limit of crosslinking temperature is present. It is necessary to choose the temperature at which the crosslinking speed and the performance of the crosslinking properties are suitable for the proper crosslinking temperature.
According to crosslinking temperature, the crosslinking agent can be classified into four types: low temperature crosslinking agent crosslinking 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 ℃. The crosslinking agent of low temperature crosslinking is very rare, and it has polyacrylate and polyisocyanate. Domestic production of T - 31 of modified amine, YH - 82 modified amine under 0 ℃ crosslinking.
There are many kinds of crosslinking at room temperature: fatty polyamine and polyamide polyamide; Low molecular polyamide and modified aromatic amine. Some of the fatty cyclic polyamines, tertiary amines, squinazole and boron trifluoride complexes belong to the medium temperature crosslinking type. The high temperature crosslinking agent has aromatic polyamines, anhydride, methylphenolic resin, amino resin, dicyandiamide and hydrazide.
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 crosslinking temperature of various crosslinking agents is different, and the heat resistance of crosslinking is also very different.
In general, the crosslinking temperature of crosslinking agent can be obtained with high heat resistance and excellent crosslinking. In addition, the crosslinking temperature and heat resistance of crosslinking agent are increased in the following order: fatty polyamine (polyamine) < aliphatic polyamine (polyamine).
The heat resistance of the catalytic polymer crosslinking agent is generally in the level of aromatic polyamines. 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 a chemical reaction. It is affected by the crosslinking temperature, the temperature increases, the reaction speed is accelerated and the gel time is shortened. The time of gelation is generally decreasing with the increase of crosslinking temperature, but the crosslinking temperature is too high, and the performance of crosslinking is often reduced, so the upper limit of crosslinking temperature is present. It is necessary to choose the temperature at which the crosslinking speed and the performance of the crosslinking properties are suitable for the proper crosslinking temperature.
According to crosslinking temperature, the crosslinking agent can be classified into four types: low temperature crosslinking agent crosslinking 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 ℃. The crosslinking agent of low temperature crosslinking is very rare, and it has polyacrylate and polyisocyanate. Domestic production of T - 31 of modified amine, YH - 82 modified amine under 0 ℃ crosslinking.
There are many kinds of crosslinking at room temperature: fatty polyamine and polyamide polyamide; Low molecular polyamide and modified aromatic amine. Some of the fatty cyclic polyamines, tertiary amines, squinazole and boron trifluoride complexes belong to the medium temperature crosslinking type. The high temperature crosslinking agent has aromatic polyamines, anhydride, methylphenolic resin, amino resin, dicyandiamide and hydrazide.
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.
The epoxy resins must be reactive with crosslinking agent to generate three - dimensional structures to be of practical value. Therefore, the structure and quality of crosslinking agent will directly affect the application of epoxy resin. The research and development of crosslinking agent abroad are much more active than epoxy resin. Compared with epoxy resin, crosslinking agent is more and more secure.
Each new crosslinking agent can solve one problem, which is the equivalent of developing a new epoxy resin or opening up an epoxy resin for a new purpose. Therefore, it is more important to develop new crosslinking agent than to develop new epoxy resin.
Since the 1990s, there have been many new features in the development trend of the world epoxy resin crosslinking agent, mainly in the following aspects.
Crosslinking agent type
New varieties emerge in an endless stream, and the amine system is still the first, followed by the acid anhydride system.
The "semi-inorganic polymer" crosslinking agent with P, Si, B, F, Mg and other elements has attracted attention with its unique properties.
The modified mercaptan and modified phenol crosslinking agent have different degrees of development. The new segmented copolymer with mercaptan at the end is heavily marketed.
When using conventional heating techniques such as convection or medium and short wave infrared powder of coating on metal substrate when heated, the first is heated surface, and then absorbed heat conduction through the powder layer to the base material, most of the heat is transferred to the substrate (if the metal is very fast, because the metal is the nature of the conductors and put it as a "heat sink"). Only when the substrate is fully heated, the interface between the substrate and the coating can meet the temperature required to initiate the crosslinking process.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
The epoxy resins must be reactive with crosslinking agent to generate three - dimensional structures to be of practical value. Therefore, the structure and quality of crosslinking agent will directly affect the application of epoxy resin. The research and development of crosslinking agent abroad are much more active than epoxy resin. Compared with epoxy resin, crosslinking agent is more and more secure.
Each new crosslinking agent can solve one problem, which is the equivalent of developing a new epoxy resin or opening up an epoxy resin for a new purpose. Therefore, it is more important to develop new crosslinking agent than to develop new epoxy resin.
Since the 1990s, there have been many new features in the development trend of the world epoxy resin crosslinking agent, mainly in the following aspects.
Crosslinking agent type
New varieties emerge in an endless stream, and the amine system is still the first, followed by the acid anhydride system.
The "semi-inorganic polymer" crosslinking agent with P, Si, B, F, Mg and other elements has attracted attention with its unique properties.
The modified mercaptan and modified phenol crosslinking agent have different degrees of development. The new segmented copolymer with mercaptan at the end is heavily marketed.
When using conventional heating techniques such as convection or medium and short wave infrared powder of coating on metal substrate when heated, the first is heated surface, and then absorbed heat conduction through the powder layer to the base material, most of the heat is transferred to the substrate (if the metal is very fast, because the metal is the nature of the conductors and put it as a "heat sink"). Only when the substrate is fully heated, the interface between the substrate and the coating can meet the temperature required to initiate the crosslinking process.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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