News Details
Water based polyurethane coating USES crosslinking agent
2017-6-6 17:34:19
Water based polyurethane coating USES crosslinking agent
Polyurethane is contain duplicate carbamate structural unit of a kind of polymer material, the traditional solvent-based polyurethane containing organic solvent and inflammable, explosive, toxic, have adverse effect on the human body and environment. With the increasing awareness of environmental protection, water based polyurethane material is gradually taken seriously.
Waterborne polyurethane is with water as dispersion medium, non-flammable, environmental protection, non-toxic, and the advantages of safety, has been widely used in coating, synthetic leather, adhesives, elastomers, building materials, textile finishing, polymer surfactant, etc. Water-based polyurethane is divided into single component water-based polyurethane and bi-component water-based polyurethane.
Single component waterborne polyurethane don't need to join crosslinking agent can get the required performance, but because of its low for the linear structure, the degree of crosslinking, molecules containing hydrophilic group, and in the hardness, water resistance and solvent resistance and so on has certain defects, and the application range is limited; And two-component waterborne polyurethane crosslinking density, coating high hardness, good abrasion resistance and adhesion strong, such as excellent mechanical properties and chemical properties such as water resistance, solvent resistance, to a certain extent, make up for the deficiency of the single component waterborne polyurethane, can be used as a high-grade materials, is the development trend of waterborne polyurethane.
The bicomponent water-based polyurethane is composed mainly of hydroxy polyols and NCO. Water-based isocyanate component as an important part of waterborne polyurethane and its composition and structure and determines the physical and mechanical properties of waterborne polyurethane, weather resistance, medium resistance and other chemical properties, so the waterborne polyurethane crosslinker research is the key to the application of waterborne polyurethane entered a substantive stage.
Isocyanates can be classified as fatty isocyanates and aromatic isocyanates. The fatty isocyanates are mainly six methyl-diisocyanate (HDI), isopulin diisocyanate (IPDI), hydrogenated phenylmethane diisocyanate (H12MDI), etc. Aromatic isocyanates mainly have toluene diisocyanate (TDI), diphenyl methane diisocyanate (MDI), multiple methyl-polyphenyl isocyanate (PAPI), etc.
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
Fatty isocyanate. HDI IPDI and is a common synthesis of waterborne polyurethane crosslinker aliphatic isocyanate, HDI class isocyanate have longer methylene chain, synthesis of crosslinking agent with low viscosity, easily dispersed by polyol composition, coating easy flow flat, good flexibility and scratch resistance.
The two NCO groups of HDI have the same activity, are prone to polymerization, produce deep polymers, and require high production processes; Excessive HDI monomer removal requires heavy investment, high technology and high cost.
As a result, the crosslinking agent only generally as a high-grade raw materials used in high-grade paint, aircraft coatings, automobile coatings, military field and solid rocket propellant and the cladding layer medium.
IPDI isocyanate with fat ring structure, the synthesis of crosslinking agent coating drying speed, high hardness, good wear resistance and chemical resistance, but because of its high viscosity, not easy dispersed by polyol component, the coating and glossiness flowing property as crosslinking agent HDI. Fatty isocyanate synthesis of polyurethane crosslinking agent performance is superior, but its price is more expensive, make its domestic application is restricted.
The main raw material of aromatic isocyanate is toluene, the price of toluene is relatively low, and the aromatic polyurethane is prepared with good mechanical properties. Liu Shenkai using MDI as raw materials, such as polymerization for floor coating was prepared by molten environmentally friendly polyurethane crosslinking agent, the crosslinking agent of low toxicity, quick drying, paint film toughness, impact resistance and good wear resistance, excellent comprehensive performance.
But aromatic water-based polyurethane crosslinking agent also has some problems: one is the existence of the benzene ring, easy to cause the material to become yellow, can only be used for low coating and adhesive agent products; Second, compared with aliphatic isocyanate, aromatic isocyanate with high activity, when mixed with polyol component, NCO group and the water reaction speed faster, lead to adverse events happened in the process of film is more, influence coating effect and performance.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Polyurethane is contain duplicate carbamate structural unit of a kind of polymer material, the traditional solvent-based polyurethane containing organic solvent and inflammable, explosive, toxic, have adverse effect on the human body and environment. With the increasing awareness of environmental protection, water based polyurethane material is gradually taken seriously.
Waterborne polyurethane is with water as dispersion medium, non-flammable, environmental protection, non-toxic, and the advantages of safety, has been widely used in coating, synthetic leather, adhesives, elastomers, building materials, textile finishing, polymer surfactant, etc. Water-based polyurethane is divided into single component water-based polyurethane and bi-component water-based polyurethane.
Single component waterborne polyurethane don't need to join crosslinking agent can get the required performance, but because of its low for the linear structure, the degree of crosslinking, molecules containing hydrophilic group, and in the hardness, water resistance and solvent resistance and so on has certain defects, and the application range is limited; And two-component waterborne polyurethane crosslinking density, coating high hardness, good abrasion resistance and adhesion strong, such as excellent mechanical properties and chemical properties such as water resistance, solvent resistance, to a certain extent, make up for the deficiency of the single component waterborne polyurethane, can be used as a high-grade materials, is the development trend of waterborne polyurethane.
The bicomponent water-based polyurethane is composed mainly of hydroxy polyols and NCO. Water-based isocyanate component as an important part of waterborne polyurethane and its composition and structure and determines the physical and mechanical properties of waterborne polyurethane, weather resistance, medium resistance and other chemical properties, so the waterborne polyurethane crosslinker research is the key to the application of waterborne polyurethane entered a substantive stage.
Isocyanates can be classified as fatty isocyanates and aromatic isocyanates. The fatty isocyanates are mainly six methyl-diisocyanate (HDI), isopulin diisocyanate (IPDI), hydrogenated phenylmethane diisocyanate (H12MDI), etc. Aromatic isocyanates mainly have toluene diisocyanate (TDI), diphenyl methane diisocyanate (MDI), multiple methyl-polyphenyl isocyanate (PAPI), etc.
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
Fatty isocyanate. HDI IPDI and is a common synthesis of waterborne polyurethane crosslinker aliphatic isocyanate, HDI class isocyanate have longer methylene chain, synthesis of crosslinking agent with low viscosity, easily dispersed by polyol composition, coating easy flow flat, good flexibility and scratch resistance.
The two NCO groups of HDI have the same activity, are prone to polymerization, produce deep polymers, and require high production processes; Excessive HDI monomer removal requires heavy investment, high technology and high cost.
As a result, the crosslinking agent only generally as a high-grade raw materials used in high-grade paint, aircraft coatings, automobile coatings, military field and solid rocket propellant and the cladding layer medium.
IPDI isocyanate with fat ring structure, the synthesis of crosslinking agent coating drying speed, high hardness, good wear resistance and chemical resistance, but because of its high viscosity, not easy dispersed by polyol component, the coating and glossiness flowing property as crosslinking agent HDI. Fatty isocyanate synthesis of polyurethane crosslinking agent performance is superior, but its price is more expensive, make its domestic application is restricted.
The main raw material of aromatic isocyanate is toluene, the price of toluene is relatively low, and the aromatic polyurethane is prepared with good mechanical properties. Liu Shenkai using MDI as raw materials, such as polymerization for floor coating was prepared by molten environmentally friendly polyurethane crosslinking agent, the crosslinking agent of low toxicity, quick drying, paint film toughness, impact resistance and good wear resistance, excellent comprehensive performance.
But aromatic water-based polyurethane crosslinking agent also has some problems: one is the existence of the benzene ring, easy to cause the material to become yellow, can only be used for low coating and adhesive agent products; Second, compared with aliphatic isocyanate, aromatic isocyanate with high activity, when mixed with polyol component, NCO group and the water reaction speed faster, lead to adverse events happened in the process of film is more, influence coating effect and performance.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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