News Details
Water borne polyurethane coating flame retardant
2017-11-3 10:59:44
Water borne polyurethane coating flame retardant
In recent years, the research and development of waterborne polyurethane coating flame retardant is also very active, because waterborne polyurethane coating flame retardant is an important development direction of environmentally friendly polyurethane coatings.
With the continuous enhancement of people's awareness of environmental protection and the increasingly stringent environmental regulations, the promotion of domestic environmental protection coatings, not only has good social benefits, but also will produce huge economic benefits. The China paint industry is in a period of rapid development, the development and application of great potential. Relevant laws and regulations urge the chemical industry to pay attention to environmental protection when developing products, so researchers must speed up the development and popularization of waterborne polyurethane coatings flame retardant.
Synthesis of waterborne polyurethane coatings. The preparation of waterborne polyurethane method usually can be divided into external emulsification and emulsification method two. External emulsification method refers to the use of additional emulsifier, shear under mandatory under strong ground method polyurethane particles dispersed in water, but because the method has the disadvantages of emulsifier, reaction time and emulsion particle diameter, the quality of the final product, physical layer performance is not good, so the production of basic without the law.
Emulsification method called self emulsifying method, refers to the introduction of hydrophilic groups in the molecular structure of polyurethane without emulsifier can make itself dispersed into emulsion method, thus become the current main methods of waterborne polyurethane production and research. The emulsification method can be divided into acetone method, prepolymer mixing method, dispersion method, ketimine / ketone azine method, terminal protection emulsification method.
Acetone method. The first synthesis of high viscosity polyurethane prepolymer containing -NCO terminated prepolymer, and acetone dissolved, the viscosity decreased, then the chain extender with chain extender containing ionic groups, in the high-speed stirring by strong shear dispersing in water, emulsified by vacuum distillation to remove the solvent of acetone, obtained aqueous polyurethane dispersion.
Tris (1,3-Dichloro-2-Propyl) Phosphate (Flame Retardant TDCPP)
Appearance: Colorless Viscous Liquid
Melting Point: -64 ℃
Boiling Point: 315 ℃
Density: 1.512
Flash Point: 249 ℃
Refractive Index: N20 / D 1.503
Specific Gravity 1.490-1.510
Chlorine Content Of 49.5% ± 0.5
Color Value Max 100
Water Content 0.10% Max
Viscosity (25 ° C) 1500-1800 CPS
Acidity (Mg KOH / G 0.10 Max
Tris (1,3-Dichloro-2-Propyl) Phosphate (Flame Retardant TDCPP) Use:
The Product Has A High Efficiency Flame Retardant, Low Volatility, High Thermal Stability, Water Resistance, Alkali Stable And Soluble In Most Organic Substances, Processing Performance, With Plastic, Moisture, Anti-Static, Anti-Pull, Anti-Compression Performance. Widely Used In Unsaturated Polyester, Polyurethane Foam, Epoxy Resin, Phenolic Resin, Rubber, Soft Polyvinyl Chloride, Synthetic Fibers And Other Plastics And Coatings At High Temperature Pyrolysis, Can Be Used As Emulsifier And Explosion-Proof Agent
The acetone method is easy to operate and has good repeatability. The waterborne polyurethane has wide range of molecular weight, controllable particle size and good product quality. It is the main method of producing waterborne polyurethane at present. But the method needs to use low boiling point acetone, which is easy to cause environmental pollution, complex process, high cost, low safety, and is not conducive to industrial production.
Prepolymer mixing method. The first synthesis of containing hydrophilic groups and the end of -NCO prepolymer, when molecular prepolymer content is not too high and the viscosity is low, can not add or add a small amount of solvent, stirring speed and then dispersed in water, the hydrophilic monomer (two amine or three amine) will be part of the chain extender, generatingrelative division of waterborne polyurethane urea with high molecular weight. Finally, the waterborne polyurethane dispersion was obtained. In order to synthesize low viscosity prepolymer, aliphatic or alicyclic polyisocyanate is usually selected, because the reaction activity of the two polyisocyanate is low, and the prepolymer is dispersed in water and is affected by water when two amine is used to expand chain.
But the dispersion process of prepolymer mixing must be carried out at low temperature to reduce the reaction activity of -NCO and water; must strictly control the prepolymer viscosity, or prepolymer dispersion will be very difficult in the water, the prepolymer mixing method avoids the use of organic solvents, the process is simple and suitable for industrial continuous production. The disadvantage is the chain extension reaction occurred in the multiphase system, the reaction cannot be carried out according to the quantitative way.
Melt dispersion polymerization, also known as melt dispersion method, is a solvent free method for preparing waterborne polyurethane. This method combines the polycondensation of isocyanate addition polymerization and amino closely together. Polyurethane prepolymer with hydrophilic ionic group and -NCO end group was synthesized firstly, and then prepolymer with urea was added to obtain urea terminated polyurethane two biuret oligomer containing ionic group.
The polycondensation and hydroxylation of the oligomer with formaldehyde aqueous solution in the molten state should lead to the formation of polyurethane two biuret with hydroxyl methyl groups.
For example, the provisions of the wall of a vessel containing TDI, HDI, IPDI, HMDI and other chemicals must be posted: free diisocyanate monomer concentration is below 0.5%, the marked "isocyanate"; free monomer content in 0.5%~2.0%, marked "bad" and "warning signs containing isocyanate free monomer content"; in more than 2%, in addition to marked "containing isocyanate", "toxic" must be marked with signs of skull bones.
The polyurethane coatings produced in China are basically aromatic solvent based coatings, and the diisocyanate used is usually TDI. In recent years, countries in the aspect of environmental protection coating for the mandatory standards, the national standard Gb18581-2001 "interior decoration materials, solvent based coatings limit of harmful substances" in the provisions of the harmful substances of lacquer, polyurethane paint and alkyd paint wooden (formaldehyde, benzene, TDI and other volatile organic compounds) Limited value.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
In recent years, the research and development of waterborne polyurethane coating flame retardant is also very active, because waterborne polyurethane coating flame retardant is an important development direction of environmentally friendly polyurethane coatings.
With the continuous enhancement of people's awareness of environmental protection and the increasingly stringent environmental regulations, the promotion of domestic environmental protection coatings, not only has good social benefits, but also will produce huge economic benefits. The China paint industry is in a period of rapid development, the development and application of great potential. Relevant laws and regulations urge the chemical industry to pay attention to environmental protection when developing products, so researchers must speed up the development and popularization of waterborne polyurethane coatings flame retardant.
Synthesis of waterborne polyurethane coatings. The preparation of waterborne polyurethane method usually can be divided into external emulsification and emulsification method two. External emulsification method refers to the use of additional emulsifier, shear under mandatory under strong ground method polyurethane particles dispersed in water, but because the method has the disadvantages of emulsifier, reaction time and emulsion particle diameter, the quality of the final product, physical layer performance is not good, so the production of basic without the law.
Emulsification method called self emulsifying method, refers to the introduction of hydrophilic groups in the molecular structure of polyurethane without emulsifier can make itself dispersed into emulsion method, thus become the current main methods of waterborne polyurethane production and research. The emulsification method can be divided into acetone method, prepolymer mixing method, dispersion method, ketimine / ketone azine method, terminal protection emulsification method.
Acetone method. The first synthesis of high viscosity polyurethane prepolymer containing -NCO terminated prepolymer, and acetone dissolved, the viscosity decreased, then the chain extender with chain extender containing ionic groups, in the high-speed stirring by strong shear dispersing in water, emulsified by vacuum distillation to remove the solvent of acetone, obtained aqueous polyurethane dispersion.
Tris (1,3-Dichloro-2-Propyl) Phosphate (Flame Retardant TDCPP)
Appearance: Colorless Viscous Liquid
Melting Point: -64 ℃
Boiling Point: 315 ℃
Density: 1.512
Flash Point: 249 ℃
Refractive Index: N20 / D 1.503
Specific Gravity 1.490-1.510
Chlorine Content Of 49.5% ± 0.5
Color Value Max 100
Water Content 0.10% Max
Viscosity (25 ° C) 1500-1800 CPS
Acidity (Mg KOH / G 0.10 Max
Tris (1,3-Dichloro-2-Propyl) Phosphate (Flame Retardant TDCPP) Use:
The Product Has A High Efficiency Flame Retardant, Low Volatility, High Thermal Stability, Water Resistance, Alkali Stable And Soluble In Most Organic Substances, Processing Performance, With Plastic, Moisture, Anti-Static, Anti-Pull, Anti-Compression Performance. Widely Used In Unsaturated Polyester, Polyurethane Foam, Epoxy Resin, Phenolic Resin, Rubber, Soft Polyvinyl Chloride, Synthetic Fibers And Other Plastics And Coatings At High Temperature Pyrolysis, Can Be Used As Emulsifier And Explosion-Proof Agent
The acetone method is easy to operate and has good repeatability. The waterborne polyurethane has wide range of molecular weight, controllable particle size and good product quality. It is the main method of producing waterborne polyurethane at present. But the method needs to use low boiling point acetone, which is easy to cause environmental pollution, complex process, high cost, low safety, and is not conducive to industrial production.
Prepolymer mixing method. The first synthesis of containing hydrophilic groups and the end of -NCO prepolymer, when molecular prepolymer content is not too high and the viscosity is low, can not add or add a small amount of solvent, stirring speed and then dispersed in water, the hydrophilic monomer (two amine or three amine) will be part of the chain extender, generatingrelative division of waterborne polyurethane urea with high molecular weight. Finally, the waterborne polyurethane dispersion was obtained. In order to synthesize low viscosity prepolymer, aliphatic or alicyclic polyisocyanate is usually selected, because the reaction activity of the two polyisocyanate is low, and the prepolymer is dispersed in water and is affected by water when two amine is used to expand chain.
But the dispersion process of prepolymer mixing must be carried out at low temperature to reduce the reaction activity of -NCO and water; must strictly control the prepolymer viscosity, or prepolymer dispersion will be very difficult in the water, the prepolymer mixing method avoids the use of organic solvents, the process is simple and suitable for industrial continuous production. The disadvantage is the chain extension reaction occurred in the multiphase system, the reaction cannot be carried out according to the quantitative way.
Melt dispersion polymerization, also known as melt dispersion method, is a solvent free method for preparing waterborne polyurethane. This method combines the polycondensation of isocyanate addition polymerization and amino closely together. Polyurethane prepolymer with hydrophilic ionic group and -NCO end group was synthesized firstly, and then prepolymer with urea was added to obtain urea terminated polyurethane two biuret oligomer containing ionic group.
The polycondensation and hydroxylation of the oligomer with formaldehyde aqueous solution in the molten state should lead to the formation of polyurethane two biuret with hydroxyl methyl groups.
For example, the provisions of the wall of a vessel containing TDI, HDI, IPDI, HMDI and other chemicals must be posted: free diisocyanate monomer concentration is below 0.5%, the marked "isocyanate"; free monomer content in 0.5%~2.0%, marked "bad" and "warning signs containing isocyanate free monomer content"; in more than 2%, in addition to marked "containing isocyanate", "toxic" must be marked with signs of skull bones.
The polyurethane coatings produced in China are basically aromatic solvent based coatings, and the diisocyanate used is usually TDI. In recent years, countries in the aspect of environmental protection coating for the mandatory standards, the national standard Gb18581-2001 "interior decoration materials, solvent based coatings limit of harmful substances" in the provisions of the harmful substances of lacquer, polyurethane paint and alkyd paint wooden (formaldehyde, benzene, TDI and other volatile organic compounds) Limited value.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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