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Beta-hydroxyalkylamide (HAA) coating crosslinking agent
2017-8-16 11:42:02
Beta-hydroxyalkylamide (HAA) coating crosslinking agent
Beta-hydroxylamide (HAA) coatings crosslinking agent [HAA, beta - hydroxylalkylaminde]
The original product number of beta-hydroxyalkylamide (HAA) paint crosslinking agent was Primid XL552. The Primid may be the closest to the TGIC substitute. In addition, the merchandise number is Vestagon HA320, a product equal to the Primid XL552.
HAA is the general term for the crosslinking agent of hydroxyalkylamide. The cross-linking agent of beta-hydroxyalkylamide (HAA) coatings has been launched in two basic varieties, which are:
1) N, N, N ', N '-4 [beta-hydroxyethyl] adipamide [N, N, N', N '-tetrakis (beta hydroxylethyl) adipamide], 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.
2) N, N, N 'N' N '-4 [beta - hydroxypropyl] adipamide [N, N, N', N '-tetrakis (beta hydroxylated l) adipamide], 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 characteristics and shortcomings of beta-haa
The rapid development of the HAA system is first and foremost because it has the following advantages:
Chinese name: Diethyl toluene diamine(DETDA)
Beta-hydroxylamide (HAA) coatings crosslinking agent [HAA, beta - hydroxylalkylaminde]
The original product number of beta-hydroxyalkylamide (HAA) paint crosslinking agent was Primid XL552. The Primid may be the closest to the TGIC substitute. In addition, the merchandise number is Vestagon HA320, a product equal to the Primid XL552.
HAA is the general term for the crosslinking agent of hydroxyalkylamide. The cross-linking agent of beta-hydroxyalkylamide (HAA) coatings has been launched in two basic varieties, which are:
1) N, N, N ', N '-4 [beta-hydroxyethyl] adipamide [N, N, N', N '-tetrakis (beta hydroxylethyl) adipamide], 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.
2) N, N, N 'N' N '-4 [beta - hydroxypropyl] adipamide [N, N, N', N '-tetrakis (beta hydroxylated l) adipamide], 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 characteristics and shortcomings of beta-haa
The rapid development of the HAA system is first and foremost because it has the following advantages:
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine packing： net weight 200KG/ galvanized iron drum (a small cabinet pallet loaded 16 tons), 1000KG/IB barrels (a small cabinet loaded 18 tons or 23 tons of ISOTANK).
Green and low-carbon. Based on its low toxicity (see chart) and low temperature crosslinking properties (130 ℃ 130 ℃ or crosslinking, completely crosslinking) can be realized.
Cost advantage. The high degree of energy and low hydroxyl equivalents determine that it can be fitted into a fully crosslinked powder system with outdoor polyester in the form of 95/5 or 94/6.
Excellent frictional electrification. The blocked amine structure determines that the beta - HAA has a good charge performance.
Better powder storage stability. The relatively high melting point will not cause the Tg of the system to be significantly reduced after the powder is imported.
However, the system of Primid also has the following shortcomings and shortcomings. Currently, the research focus of HAA powder coatings is focused on how to solve the following shortcomings and shortcomings.
It is difficult to apply film, especially one step extrusion method. This is because the HAA crosslinking reaction is difficult to be catalyzed by the catalyst, and it is not easy to use the principle of multi-stage reaction to eliminate the light. But the good news is that there are already domestic solutions.
The film can easily produce pinholes, especially when applied. The introduction of some special effects degassing agent can solve the problem of thick coating well. This part is discussed in detail
After baking film is prone to yellowing, the gas is more prone to yellowing. This can be improved by using an appropriate antioxidant, as shown in the antioxidant content.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Green and low-carbon. Based on its low toxicity (see chart) and low temperature crosslinking properties (130 ℃ 130 ℃ or crosslinking, completely crosslinking) can be realized.
Cost advantage. The high degree of energy and low hydroxyl equivalents determine that it can be fitted into a fully crosslinked powder system with outdoor polyester in the form of 95/5 or 94/6.
Excellent frictional electrification. The blocked amine structure determines that the beta - HAA has a good charge performance.
Better powder storage stability. The relatively high melting point will not cause the Tg of the system to be significantly reduced after the powder is imported.
However, the system of Primid also has the following shortcomings and shortcomings. Currently, the research focus of HAA powder coatings is focused on how to solve the following shortcomings and shortcomings.
It is difficult to apply film, especially one step extrusion method. This is because the HAA crosslinking reaction is difficult to be catalyzed by the catalyst, and it is not easy to use the principle of multi-stage reaction to eliminate the light. But the good news is that there are already domestic solutions.
The film can easily produce pinholes, especially when applied. The introduction of some special effects degassing agent can solve the problem of thick coating well. This part is discussed in detail
After baking film is prone to yellowing, the gas is more prone to yellowing. This can be improved by using an appropriate antioxidant, as shown in the antioxidant content.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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