News Details
Water dispersible polyisocyanate paint crosslinking agent
2017-8-30 12:07:17
Water dispersible polyisocyanate paint crosslinking agent
At present, there are two types of water-dispersible polyisocyanate crosslinking agents: the first, hydrophobic polyisocyanate, especially the low viscosity, such as polyisocyanates used in conventional two-component polyurethane coatings; Second, modified hydrophilic self-emulsifying polyisocyanate. Currently, there are two cross-linking agents based on HDI and IPDI in the market of water-dispersible polyisocyanate crosslinking agent.
Low viscosity hydrophobic polyisocyanates must be compatible with suitable organic solvents and can be incorporated into the water dispersion in high shear forces (such as using stirring or dispersing equipment). The modified hydrophilic polyisocyanate can be obtained by simple hand stirring, and can obtain a homogeneous mixture of non-co-solvent and water-dispersible polyisocyanate crosslinking agent.
Aliphatic or alicyclic isocyanate (e.g., HDI or IPDI trimer), and inadequate single functionality polyethylene oxide polyether glycol, simple reaction generated containing polyether urethane nonionic emulsifier mixture of isocyanate. In this way, the modified hydrophilic polyisocyanate is easy to be emulsified by hand emulsification in water without applying high shear force. This kind of water-emulsified polyisocyanate (e.g. Bayhydur3100, bayhydur401-70) has been identified as standard crosslinking agent for most water-based coatings and adhesives.
Although polyether modified isocyanate used more widely, but they have a fundamental weakness, especially when used as a crosslinking agent of waterborne two-component polyurethane coatings, need higher content of polyether, to ensure enough dispersivity, this leads to a long drying time, and give lasting hydrophilic coating. For these reasons, polyether modification of polyisocyanates is not accepted by applications requiring the highest level of resistance, such as in car primers or anti-graffiti coatings. These shortcomings can be overcome by the development of special ionic modified polyisocyanates.
Aliphatic isocyanate and 3 - (hexanaphthene amino) - 1 - propane sulfonic acid (CAPS) (the latter sulfamic acid salt of zwitterionic), under mild conditions and reaction in the presence of tertiary amine neutralizer, generated sulfonic acid urea derivative is an excellent emulsifying agent.
Not consider into salt group, more CAPS modified isocyanate has good storage stability, not cloudy, even if have fewer sulfonate groups, also can be dispersed in water good emulsion.
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
At present, there are two types of water-dispersible polyisocyanate crosslinking agents: the first, hydrophobic polyisocyanate, especially the low viscosity, such as polyisocyanates used in conventional two-component polyurethane coatings; Second, modified hydrophilic self-emulsifying polyisocyanate. Currently, there are two cross-linking agents based on HDI and IPDI in the market of water-dispersible polyisocyanate crosslinking agent.
Low viscosity hydrophobic polyisocyanates must be compatible with suitable organic solvents and can be incorporated into the water dispersion in high shear forces (such as using stirring or dispersing equipment). The modified hydrophilic polyisocyanate can be obtained by simple hand stirring, and can obtain a homogeneous mixture of non-co-solvent and water-dispersible polyisocyanate crosslinking agent.
Aliphatic or alicyclic isocyanate (e.g., HDI or IPDI trimer), and inadequate single functionality polyethylene oxide polyether glycol, simple reaction generated containing polyether urethane nonionic emulsifier mixture of isocyanate. In this way, the modified hydrophilic polyisocyanate is easy to be emulsified by hand emulsification in water without applying high shear force. This kind of water-emulsified polyisocyanate (e.g. Bayhydur3100, bayhydur401-70) has been identified as standard crosslinking agent for most water-based coatings and adhesives.
Although polyether modified isocyanate used more widely, but they have a fundamental weakness, especially when used as a crosslinking agent of waterborne two-component polyurethane coatings, need higher content of polyether, to ensure enough dispersivity, this leads to a long drying time, and give lasting hydrophilic coating. For these reasons, polyether modification of polyisocyanates is not accepted by applications requiring the highest level of resistance, such as in car primers or anti-graffiti coatings. These shortcomings can be overcome by the development of special ionic modified polyisocyanates.
Aliphatic isocyanate and 3 - (hexanaphthene amino) - 1 - propane sulfonic acid (CAPS) (the latter sulfamic acid salt of zwitterionic), under mild conditions and reaction in the presence of tertiary amine neutralizer, generated sulfonic acid urea derivative is an excellent emulsifying agent.
Not consider into salt group, more CAPS modified isocyanate has good storage stability, not cloudy, even if have fewer sulfonate groups, also can be dispersed in water good emulsion.
Chinese name: Diethyl toluene diamine(DETDA)
Physical and chemical properties: light yellow transparent liquid, slightly soluble in water, soluble in alcohols, ethers, ketones and other polar organic solvents, and polyether, polyester polyol compatibility.
Density 1.022
Viscosity (20 ℃) ??mPa·ss290±10
Pour Point ℃-9
Boiling point of310°C
Flash Point°C161.1°C
A series of ionized modified polyisocyanates (e.g. BayhydurX2487/1, BayhydurXP2547, BayhydurXP2570, BayhydurXP2655) are available for various environment-friendly high quality water-based polyurethane coatings. These coatings can be compared with general solvent-based coatings in terms of drying, crosslinking and chemical resistance.
The new regulations require further reduction of VOC (volatile organic compounds), and the amount of these crosslinking agents will increase in the future, and they will not lead to a decline in the quality of the paint film compared with the solvent coatings.
The flocculation or liquid droplets of a dispersed solid particle can be dispersed as small particles suspended in a dispersed medium without precipitating performance in water or other homogeneous liquid medium.
The dispersion is related to the surface area of the material, which is more dispersed than the surface area. Dispersion is used to indicate the dispersion of the material. Divided according to the dispersed particle size, molecular dispersion (dispersed material particle size less than 10 ^ 7 cm), colloidal dispersion (dispersed material particle size 10 ^ 7 ~ 10 ^ 5 cm), coarse dispersion (dispersed material granularity in 10 ^ 5 ~ 10 ^ - 3 cm).
Polydispersity is a typical characteristic of soft matter. The strength of soft matter is determined by the diversification of the system. As a kind of soft material, the polydispersity of the first class structure must be influenced or reflected in the polydispersity of its aggregation structure and nature. The multi-dispersive performance of the crystallization sequence length of the crystalline olefin copolymer can be significantly different with the forming process and the performance of the similar copolymers. The polydispersity of the crystallization sequence of the crystallized olefin copolymer was determined and influenced by the fluctuation of the polymerization condition control, so the dispersion of the crystallization sequence in the copolymer was studied.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
A series of ionized modified polyisocyanates (e.g. BayhydurX2487/1, BayhydurXP2547, BayhydurXP2570, BayhydurXP2655) are available for various environment-friendly high quality water-based polyurethane coatings. These coatings can be compared with general solvent-based coatings in terms of drying, crosslinking and chemical resistance.
The new regulations require further reduction of VOC (volatile organic compounds), and the amount of these crosslinking agents will increase in the future, and they will not lead to a decline in the quality of the paint film compared with the solvent coatings.
The flocculation or liquid droplets of a dispersed solid particle can be dispersed as small particles suspended in a dispersed medium without precipitating performance in water or other homogeneous liquid medium.
The dispersion is related to the surface area of the material, which is more dispersed than the surface area. Dispersion is used to indicate the dispersion of the material. Divided according to the dispersed particle size, molecular dispersion (dispersed material particle size less than 10 ^ 7 cm), colloidal dispersion (dispersed material particle size 10 ^ 7 ~ 10 ^ 5 cm), coarse dispersion (dispersed material granularity in 10 ^ 5 ~ 10 ^ - 3 cm).
Polydispersity is a typical characteristic of soft matter. The strength of soft matter is determined by the diversification of the system. As a kind of soft material, the polydispersity of the first class structure must be influenced or reflected in the polydispersity of its aggregation structure and nature. The multi-dispersive performance of the crystallization sequence length of the crystalline olefin copolymer can be significantly different with the forming process and the performance of the similar copolymers. The polydispersity of the crystallization sequence of the crystallized olefin copolymer was determined and influenced by the fluctuation of the polymerization condition control, so the dispersion of the crystallization sequence in the copolymer was studied.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Spanish
French
Italian
Portuguese
Japanese
Korean
Arabic
Russian