A production process of waterborne polyurethane coating with high tensile coating film

A water-based polyurethane and production process technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of brightness, fastness, dry and wet rubbing resistance, etc., achieve full hand feeling, good compatibility, and increase molecular weight Effect

Active Publication Date: 2017-03-29
JIANGSU INSTITUTE OF EDUCATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with foreign leather finishing agents, most domestic products still have shortcomings such as low brightness, fastness, and low dry and wet rub resistance.

Method used

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  • A production process of waterborne polyurethane coating with high tensile coating film
  • A production process of waterborne polyurethane coating with high tensile coating film
  • A production process of waterborne polyurethane coating with high tensile coating film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: Add 50 parts of polyether polyol PTMG-2000, 20 parts of polyadipate-1,4-butylene glycol ester diol, and 1.6 parts of dimethylol butyric acid (DMBA) into the reaction flask, and heat After reaching 78°C, add 31 parts of toluene diisocyanate (TDI), cool down to 70°C and continue the reaction for 25 minutes; add 1,4-butanediol (BDO) (the type of small molecule chain extender can vary, see Table 1) 4.3 After that, heat up to 80°C and keep it warm for 25min; then add 4.0 parts of dimethylolbutyric acid (DMBA) again, and increase the reaction temperature to 85°C for 25min; take a sample to measure the NCO % value, if it does not reach the theoretical value, then Raise the temperature to 90 °C; after reaching the theoretical NCO % value, add ethylene glycol dimethyl ether-acetone mixed solvent (solvent A system) to reduce the viscosity of the reaction system, and lower the temperature to 30-40 °C, add 3.2 parts of neutralizing agent triethylamine , into salt for 15 ...

Embodiment 2

[0032] Example 2: Add 50 parts of polyether polyol PTMG-2000, 20 parts of polyethylene adipate diol, and 3.0 parts of 1,4-butanediol-2-sodium sulfonate into the reaction flask, and heat to After 78°C, add 30 parts of hexamethylene diisocyanate (HDI), cool down to 70°C and continue to react for 30 minutes; After 4.3 parts of 1,4-butanediol-2-sulfonate, the temperature was raised to 80 °C and kept for 30 min; then 4.2 parts of 1,4-butanediol-2-sodium sulfonate were added again, and the reaction temperature was raised to 85 °C for 30 min; samples were taken to determine NCO % value, if it does not reach the theoretical value, heat up to 90 °C; after reaching the theoretical NCO % value, add ethylene glycol dimethyl ether-acetone mixed solvent (solvent A system) to reduce the viscosity of the reaction system, and cool down to 30-40 °C, Add 3.2 parts of neutralizing agent triethylamine and form salt for 15 minutes; add deionized water and stir at high speed to disperse, then add ch...

Embodiment 3

[0033] Example 3: Add 50 parts of polyether polyol PTMG-2000, 20 parts of polycarbonate diol 980R, and 2.9 parts of dimethylol propionic acid (DMPA) into the reaction bottle, heat it to 78°C, and then add benzene 33 parts of dimethylene diisocyanate (XDI), lower the temperature to 70°C and continue to react for 35 minutes; after adding 3 parts of 1,4-butanediol (BDO) (the type of small molecule chain extender is variable, similar to Table 1), Raise the temperature to 80 °C and keep it warm for 35 minutes; then add 2.1 parts of dimethylolpropionic acid (DMPA) again, and increase the reaction temperature to 85 °C for 35 minutes; take samples to measure the NCO % value, if it does not reach the theoretical value, then raise the temperature to 90 °C; after reaching the theoretical NCO % value, add ethylene glycol dimethyl ether-acetone mixed solvent (solvent A system) to reduce the viscosity of the reaction system, and lower the temperature to 30-40 °C, add 3.2 parts of neutralizing ...

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Abstract

The present invention discloses a production process of a waterborne polyurethane coating material having a high tension force coating film. According to the production process, polyether, polyester polyol and isocyanate are adopted as raw materials, a hydrophilic chain extender is gradually added during the reaction process, an ethylene glycol dimethyl ether-acetone mixed solvent or diethylene glycol dimethyl ether-acetone mixed solvent is added when the reaction achieves the theoretical NCO% value, and finally salification, emulsifying and chain extending are performed to obtain the product. According to the present invention, the hydrophilic groups in the obtained product of the present invention are broadly distributed in the molecular chain compared with the product obtained through the traditional process, wherein the hydrophilic groups are not only distributed in the prepolymer chain end and also distributed in the chain so as to further improve the hydrophilic efficiency of the hydrophilic groups; and according to the structural characteristics of the prepolymer molecular chain, the two solvent systems are selected, such that the elongation and the tension force of the waterborne polyurethane coating after the film forming can be significantly improved with the solvent systems, the compatibility of the solvent system and the aqueous emulsion is good, and the stability is high.

Description

technical field [0001] The invention relates to the field of production technology of water-based coatings, in particular to a production technology of water-based polyurethane coatings with high tensile force coating films. Background technique [0002] Polyurethane is the abbreviation of polyurethane. It is a polymer compound characterized by repeated carbamate groups (-NHCOO-) in the molecular structure of the polymer chain. [0003] The water-based polyurethane system uses diisocyanate and diols for polycondensation reaction to form a prepolymer with -NCO at both ends, and then uses a diamine connected to a hydrophilic acidic group as a chain extender to be embedded in the polyurethane molecular chain; Depending on the number of raw material functional groups used in the reaction, it can be made into a linear or bulk structure. Due to the introduction of hydrophilic groups into the prepolymer produced by the reaction, it has a certain degree of hydrophilicity, and then...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/08C09D175/06C08G18/66C08G18/48C08G18/42C08G18/34C08G18/32
Inventor 姜大炜司南朱成红郭琦
Owner JIANGSU INSTITUTE OF EDUCATION
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