News Details
Beta-hydroxyalkylamide (HAA) paint crosslinking agent
2017-5-8 15:42:55
Beta-hydroxyalkylamide (HAA) paint crosslinking agent[HAA, beta hydroxylalkylaminde]
The first product of this kind of crosslinking agent is Primid XL552. The Primid is probably the closest to the TGIC alternative. In addition, the merchandise number is Vestagon HA320, a product equivalent to the Primid XL552.
HAA is the general term for the crosslinking agent for hydroxyalkylamide, and there are two basic varieties that have been marketed today:
[N, N, N ', N '-tetrakis], CAS No. 6334-25-4. Commercial brand: Primid XL552 (Vestagon HA320), typical properties: white powder, liquid melting range 118 ~ 128 ℃, the hydroxyl equivalent. 80-84.
[N, N, N ', N '-tetrakis], CAS No. 57843-53-5. Commercial brand: Primid QM1260 (Vestagon HA376), typical properties: white powder, liquid melting range 100 ~ 115 ℃, the hydroxyl equivalent. 95-105.
Beta - HAA is a kind of four functional polyol, beta hydroxy affected by nitrogen atoms, has a highly active, under the condition of no catalyst can be polyester or acrylic resin reaction and carboxy end, produce ester chain, thus crosslinking, and release of water molecules. There is evidence to prove that, beta HAA at above 130 ℃ can produce high reactivity oxazolinium intermediates, once forms and quickly and carboxyl groups form ester chain reaction.
The technical features and shortcomings of beta-haa
The rapid development of the HAA system is primarily because it has the following advantages:
Low carbon environmental protection. It is based on the low toxicity (see table) and low temperature crosslinking feature (130).
Cost advantage. High office and low hydroxyl yield, which determines the ratio of 95/5 or 94/6 to an outdoor polyester, can be fully crosslinked.
Excellent friction charge. The hindered amine structure determines that beta-haa has good electrical properties.
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.
Better powder storage stability. The relatively high melting point will not cause the system's Tg to drop significantly after the powder is imported.
However, the system of primids also has the following disadvantages and disadvantages, and the current research focus of HAA powder coating is focused on how to solve the following defects and shortcomings.
It's relatively difficult to get rid of the film, especially the difficulty of squeezing out the light. This is because the HAA crosslinking reaction is difficult to catalyze by catalysts, and it is not easy to use multistage reactions to eliminate light. But the good news is that there are already domestic solutions.
The coating tends to produce pinholes, especially when applied thickly. The introduction of some special effects degassing agents can be used to solve the problem of thickening, which is a part of the anti-foaming agent
Overbaking film is prone to yellowing, and the burning of gas is more likely to be yellow. This can be improved by using the right antioxidant, which is part of the antioxidant content.
The hydrolysis is slightly worse than the TGIC, and the less pure HAA is worse. It is possible to overcome this difficulty with a polyester suitable for adaptation.
The improvement of HAA continues, with the latest reporting on [6]'s use of the two functional groups of the two functional groups - p-tert-butyl benzoformamide.
And XL552 倂 with yellow can be improved greatly and thick coating performance. This is because the tert-butyl group has a certain antioxidant effect.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
The first product of this kind of crosslinking agent is Primid XL552. The Primid is probably the closest to the TGIC alternative. In addition, the merchandise number is Vestagon HA320, a product equivalent to the Primid XL552.
HAA is the general term for the crosslinking agent for hydroxyalkylamide, and there are two basic varieties that have been marketed today:
[N, N, N ', N '-tetrakis], CAS No. 6334-25-4. Commercial brand: Primid XL552 (Vestagon HA320), typical properties: white powder, liquid melting range 118 ~ 128 ℃, the hydroxyl equivalent. 80-84.
[N, N, N ', N '-tetrakis], CAS No. 57843-53-5. Commercial brand: Primid QM1260 (Vestagon HA376), typical properties: white powder, liquid melting range 100 ~ 115 ℃, the hydroxyl equivalent. 95-105.
Beta - HAA is a kind of four functional polyol, beta hydroxy affected by nitrogen atoms, has a highly active, under the condition of no catalyst can be polyester or acrylic resin reaction and carboxy end, produce ester chain, thus crosslinking, and release of water molecules. There is evidence to prove that, beta HAA at above 130 ℃ can produce high reactivity oxazolinium intermediates, once forms and quickly and carboxyl groups form ester chain reaction.
The technical features and shortcomings of beta-haa
The rapid development of the HAA system is primarily because it has the following advantages:
Low carbon environmental protection. It is based on the low toxicity (see table) and low temperature crosslinking feature (130).
Cost advantage. High office and low hydroxyl yield, which determines the ratio of 95/5 or 94/6 to an outdoor polyester, can be fully crosslinked.
Excellent friction charge. The hindered amine structure determines that beta-haa has good electrical properties.
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.
Better powder storage stability. The relatively high melting point will not cause the system's Tg to drop significantly after the powder is imported.
However, the system of primids also has the following disadvantages and disadvantages, and the current research focus of HAA powder coating is focused on how to solve the following defects and shortcomings.
It's relatively difficult to get rid of the film, especially the difficulty of squeezing out the light. This is because the HAA crosslinking reaction is difficult to catalyze by catalysts, and it is not easy to use multistage reactions to eliminate light. But the good news is that there are already domestic solutions.
The coating tends to produce pinholes, especially when applied thickly. The introduction of some special effects degassing agents can be used to solve the problem of thickening, which is a part of the anti-foaming agent
Overbaking film is prone to yellowing, and the burning of gas is more likely to be yellow. This can be improved by using the right antioxidant, which is part of the antioxidant content.
The hydrolysis is slightly worse than the TGIC, and the less pure HAA is worse. It is possible to overcome this difficulty with a polyester suitable for adaptation.
The improvement of HAA continues, with the latest reporting on [6]'s use of the two functional groups of the two functional groups - p-tert-butyl benzoformamide.
And XL552 倂 with yellow can be improved greatly and thick coating performance. This is because the tert-butyl group has a certain antioxidant effect.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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