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Polyurethane powder coating with polyisocyanate crosslinking agent
2017-8-27 15:28:12
Polyurethane powder coating with polyisocyanate crosslinking agent
In the manufacture of polyurethane powder coating, to avoid the crosslinking reaction at room temperature and coating provides excellent storage stability, must be used by the polyurethane coating with multiple isocyanate crosslinking agent of isocyanate to protect it.
Although there are quite a lot of isocyanate and a variety of sealants can exist in many different combinations, but only in caprolactam closed isophorone diisocyanate derivative truly of commercial value.
Hexinamide sealed IPDI derivatives.It is the most widely used polyurethane powder coating for polyurethane powder coating with polyisocyanate crosslinking agent.
They should have the proper melting range, so that they can be used as powder coating polyisocyanate crosslinking agent.When the system is properly catalyzed, the solution temperature and crosslinking rate can be adjusted to the normal cross-linking condition in 160?- 170?One of the reactions of caprolactam is isolated from the isovol diisocyanate (IPDI, such as B1530).Caprolactam closes IPDI prepolymer, and different catalysts are used to accelerate the reaction between isocyanates and alcohols.
Isocyanate is one of the main raw material of polyurethane adhesives, making use of isocyanate polyurethane adhesives have diisocyanate, three isocyanate and their modification, one of the most common is diisocyanate.Polyisocyanate was used in the low price of toluene and benzene as raw materials, so the development was fast and dominant.
The polyisocyanate molecule contains two or more active sites, so it can be extended to either two or three to form a linear or crosslinked polymer when the polymerization reaction occurs.The preparation of polyisocyanates in industry is achieved through the reaction of bermide and photogas.
The most commonly used isocyanates are TDI, MDl and PAPI.TDI has 2, 4 - TDI and 2, 6 - TDI, which are isomers of each other, and commonly used TDI is their mixture.TDI has the advantages of high activity and low price, but it is volatile, irritating and toxic.At low temperature methyl isocyanate is much more active in the adjacent position of isocyanate.
MDI under normal temperature is solid, the activity of two isocyanate base is the same, excitant small, taking it as raw material to the preparation of wife goo has high bonding strength and impact toughness, it is commonly used as sealant adhesion agent Zhai expected a Pap, functions are the three degrees, can be made into high crosslinking density, polyurethane adhesives often cooperate with neoprene, made widely used oxygen butyl - column g glue adhesion agent.
Chinese name: Diethyl toluene diamine(DETDA)
In the manufacture of polyurethane powder coating, to avoid the crosslinking reaction at room temperature and coating provides excellent storage stability, must be used by the polyurethane coating with multiple isocyanate crosslinking agent of isocyanate to protect it.
Although there are quite a lot of isocyanate and a variety of sealants can exist in many different combinations, but only in caprolactam closed isophorone diisocyanate derivative truly of commercial value.
Hexinamide sealed IPDI derivatives.It is the most widely used polyurethane powder coating for polyurethane powder coating with polyisocyanate crosslinking agent.
They should have the proper melting range, so that they can be used as powder coating polyisocyanate crosslinking agent.When the system is properly catalyzed, the solution temperature and crosslinking rate can be adjusted to the normal cross-linking condition in 160?- 170?One of the reactions of caprolactam is isolated from the isovol diisocyanate (IPDI, such as B1530).Caprolactam closes IPDI prepolymer, and different catalysts are used to accelerate the reaction between isocyanates and alcohols.
Isocyanate is one of the main raw material of polyurethane adhesives, making use of isocyanate polyurethane adhesives have diisocyanate, three isocyanate and their modification, one of the most common is diisocyanate.Polyisocyanate was used in the low price of toluene and benzene as raw materials, so the development was fast and dominant.
The polyisocyanate molecule contains two or more active sites, so it can be extended to either two or three to form a linear or crosslinked polymer when the polymerization reaction occurs.The preparation of polyisocyanates in industry is achieved through the reaction of bermide and photogas.
The most commonly used isocyanates are TDI, MDl and PAPI.TDI has 2, 4 - TDI and 2, 6 - TDI, which are isomers of each other, and commonly used TDI is their mixture.TDI has the advantages of high activity and low price, but it is volatile, irritating and toxic.At low temperature methyl isocyanate is much more active in the adjacent position of isocyanate.
MDI under normal temperature is solid, the activity of two isocyanate base is the same, excitant small, taking it as raw material to the preparation of wife goo has high bonding strength and impact toughness, it is commonly used as sealant adhesion agent Zhai expected a Pap, functions are the three degrees, can be made into high crosslinking density, polyurethane adhesives often cooperate with neoprene, made widely used oxygen butyl - column g glue adhesion agent.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine packingļ¼ 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).
Isocyanates are the general term for various esters of isocyanates.If the number of - NCO groups is classified, including monoisocyanate R - N = C = O and diisocyanate O = C = n-r-n = C = O and polyisocyanate, etc.Isocyanate part of the production equipment of the reactor, storage tank and other working under high temperature and high pressure, there is a leakage of equipment corrosion or the seals induced toxic accidents and explosion hazards such as fire, must strengthen the technological process, equipment manufacture and maintenance, safety management, to ensure safe and smooth operation.
The urea dione of IPDI.The polyisocyanate crosslinking agent suitable for producing polyurethane powder coatings is an internal closed IPDI, which is made in alkaline medium through self - condensation process.
The content of free NCO group is very low (less than 1%) and the total NCO content is 15.4%.The melting point is at 105?- 115?Within the scope.The most obvious advantage of ipdiurea and the closed isocyanates is that no byproducts are left during the cross-linking period.
Therefore, from a technical point of view, BF1540 crosslinked polyurethane is the best substitute for TGIC powder coatings.
However, BF1540 has been commercialized for more than 15 years, but has not created a satisfied fixed market.This can be attributed to the reaction activity of BF1540 (too) and poor solvent and chemical resistance (due to its functional degree < 2).
TMXDI and other polyisocyanates.Two new isocyanate - and - tetramethylene diisocyanates (between and TMXDI) are important ingredients for the manufacture of powder coatings.Compared with traditional fatty isocyanates, they have more economical advantages.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Isocyanates are the general term for various esters of isocyanates.If the number of - NCO groups is classified, including monoisocyanate R - N = C = O and diisocyanate O = C = n-r-n = C = O and polyisocyanate, etc.Isocyanate part of the production equipment of the reactor, storage tank and other working under high temperature and high pressure, there is a leakage of equipment corrosion or the seals induced toxic accidents and explosion hazards such as fire, must strengthen the technological process, equipment manufacture and maintenance, safety management, to ensure safe and smooth operation.
The urea dione of IPDI.The polyisocyanate crosslinking agent suitable for producing polyurethane powder coatings is an internal closed IPDI, which is made in alkaline medium through self - condensation process.
The content of free NCO group is very low (less than 1%) and the total NCO content is 15.4%.The melting point is at 105?- 115?Within the scope.The most obvious advantage of ipdiurea and the closed isocyanates is that no byproducts are left during the cross-linking period.
Therefore, from a technical point of view, BF1540 crosslinked polyurethane is the best substitute for TGIC powder coatings.
However, BF1540 has been commercialized for more than 15 years, but has not created a satisfied fixed market.This can be attributed to the reaction activity of BF1540 (too) and poor solvent and chemical resistance (due to its functional degree < 2).
TMXDI and other polyisocyanates.Two new isocyanate - and - tetramethylene diisocyanates (between and TMXDI) are important ingredients for the manufacture of powder coatings.Compared with traditional fatty isocyanates, they have more economical advantages.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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