News Details
Polyurethane powder coating crosslinking agent
2017-8-21 18:14:28
Polyurethane powder coating 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 crosslinking agent of isocyanate polyurethane powder coating to protect it.
Although there are quite a few crosslinking agent of isocyanate polyurethane powder coating and various blocking agent 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 crosslinking agent for polyurethane powder coating. They should be in proper melting range so that they can be used as the crosslinking agent for polyurethane powder coatings.
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.
Chlorinated polyether powder coatings. Chlorinated polyether has excellent chemical stability, coating of many kinds of acid, alkali and solvents have good corrosion resistance, dissolving resistance, chemical stability after ptfe, mechanical and friction performance is very good also. Chlorinated polyether powder coatings are mainly used in chemical equipment, pipeline lining, meter equipment shell etc. The disadvantage is that it has poor adhesion to metal. Added additives can improve the adhesion of metal.
Latex powder is made by spray drying, mostly vinyl acetate copolymer. The coating produced by latex powder is called latex powder coating. It is the most environmentally friendly coating in the wall coating.
Powder spraying construction technology and requirements: the so-called powder electrostatic spraying is the principle of high voltage electrostatic corona electric field. In the head of the nozzle, the metal guide is connected to the high pressure negative electrode, which is grounded into the positive electrode, which makes a strong electrostatic field between the spray gun and the workpiece.
Chinese name: Diethyl toluene diamine(DETDA)
Chinese alias: aryl, aryl diethyl - aryl - methyl-p-phenylenediamine
English name: Benzenediamine, ar, ar-diethyl-ar-methyl-English aliases:Diethyltoluenediamine; ar, ar-Diethyl-ar-methylbenzenediamine;Diethylmethylbenzenediamine;
CAS No. :68479-98-1
EINECS No. :270 -877-4
Molecular formula: C11H18N2
Molecular Weight: 178.28
Boiling point: 310 ℃
Refractive index: 1.581
Flash Point: > 140 ℃
Inchi: InChI = 1/C11H18N2/c1-4-8-6-7 (3) 10 (12) 11 (13) 9 (8) 5-2/h6H ,4-5,12-13H2 ,1-3H3 density : 1.022
Risk Codes: R10; R35
RIDADR: UN 3082
Safety instructions: S2; S26; S39; S61
Packing Group: III
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 crosslinking agent of isocyanate polyurethane powder coating to protect it.
Although there are quite a few crosslinking agent of isocyanate polyurethane powder coating and various blocking agent 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 crosslinking agent for polyurethane powder coating. They should be in proper melting range so that they can be used as the crosslinking agent for polyurethane powder coatings.
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.
Chlorinated polyether powder coatings. Chlorinated polyether has excellent chemical stability, coating of many kinds of acid, alkali and solvents have good corrosion resistance, dissolving resistance, chemical stability after ptfe, mechanical and friction performance is very good also. Chlorinated polyether powder coatings are mainly used in chemical equipment, pipeline lining, meter equipment shell etc. The disadvantage is that it has poor adhesion to metal. Added additives can improve the adhesion of metal.
Latex powder is made by spray drying, mostly vinyl acetate copolymer. The coating produced by latex powder is called latex powder coating. It is the most environmentally friendly coating in the wall coating.
Powder spraying construction technology and requirements: the so-called powder electrostatic spraying is the principle of high voltage electrostatic corona electric field. In the head of the nozzle, the metal guide is connected to the high pressure negative electrode, which is grounded into the positive electrode, which makes a strong electrostatic field between the spray gun and the workpiece.
Chinese name: Diethyl toluene diamine(DETDA)
Chinese alias: aryl, aryl diethyl - aryl - methyl-p-phenylenediamine
English name: Benzenediamine, ar, ar-diethyl-ar-methyl-English aliases:Diethyltoluenediamine; ar, ar-Diethyl-ar-methylbenzenediamine;Diethylmethylbenzenediamine;
CAS No. :68479-98-1
EINECS No. :270 -877-4
Molecular formula: C11H18N2
Molecular Weight: 178.28
Boiling point: 310 ℃
Refractive index: 1.581
Flash Point: > 140 ℃
Inchi: InChI = 1/C11H18N2/c1-4-8-6-7 (3) 10 (12) 11 (13) 9 (8) 5-2/h6H ,4-5,12-13H2 ,1-3H3 density : 1.022
Risk Codes: R10; R35
RIDADR: UN 3082
Safety instructions: S2; S26; S39; S61
Packing Group: III
Hazard Class: 6.1
When compressed air as carrier gas, the powder coating powder for powder from the barrel of the pipe to the spray gun guide rod, because the guide rod connected to high voltage anode of corona discharge, near its produced negative charge, make the powder with negative charge, and entered into the field intensity high electrostatic field, under the dual role of electrostatic force and the carrier gas, powder evenly to ground workpiece surface layer thickness uniformity of powder, reheat crosslinked into durable coating.
Coating construction process. Pretreatment of a dry removal of moisture by a spray inspection of a finished product to check the construction requirements of general powders
The properties of powder coating can be used to extend the life of coating. When spraying, the coating should be completely grounded to increase the spraying efficiency of powder coating.
Powder spraying immediately after inspection, if discover the defect should be handled in time, if finding defects after crosslinking, the only local without affecting the smaller range, the coated surface decoration, color powder can be used with the acetone diluted to repair, if large range and influence the surface quality, use sand paper burnish, spraying again or use the paint remover to remove coating, Suo powder again.
The recycling powder should be filtered and removed, and then mixed with the new powder.
Polymerization at room temperature is slow, but heating to 45 ℃ above or the presence of catalyst and the can generate dimer. Can react with strong oxidizer. When hot, open fire, spark can catch fire. Heat decomposition releases cyanide and nitrogen oxides.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
When compressed air as carrier gas, the powder coating powder for powder from the barrel of the pipe to the spray gun guide rod, because the guide rod connected to high voltage anode of corona discharge, near its produced negative charge, make the powder with negative charge, and entered into the field intensity high electrostatic field, under the dual role of electrostatic force and the carrier gas, powder evenly to ground workpiece surface layer thickness uniformity of powder, reheat crosslinked into durable coating.
Coating construction process. Pretreatment of a dry removal of moisture by a spray inspection of a finished product to check the construction requirements of general powders
The properties of powder coating can be used to extend the life of coating. When spraying, the coating should be completely grounded to increase the spraying efficiency of powder coating.
Powder spraying immediately after inspection, if discover the defect should be handled in time, if finding defects after crosslinking, the only local without affecting the smaller range, the coated surface decoration, color powder can be used with the acetone diluted to repair, if large range and influence the surface quality, use sand paper burnish, spraying again or use the paint remover to remove coating, Suo powder again.
The recycling powder should be filtered and removed, and then mixed with the new powder.
Polymerization at room temperature is slow, but heating to 45 ℃ above or the presence of catalyst and the can generate dimer. Can react with strong oxidizer. When hot, open fire, spark can catch fire. Heat decomposition releases cyanide and nitrogen oxides.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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