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Polyurethane aqueous dispersion, and preparation method and application thereof

A polyurethane water dispersion, polyurethane technology, applied in the direction of polyurea/polyurethane coatings, coatings, fire-resistant coatings, etc., to achieve the effect of increasing the initial thermal decomposition temperature, improving thermal stability, and improving fire resistance

Inactive Publication Date: 2017-09-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Polyurethane aqueous dispersion, and preparation method and application thereof

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Embodiment 1

[0037] (1) Add 33.0g of PTMG 1000 and 40.0g of PTMG2000 into a 500mL four-necked flask equipped with a stirrer, a thermometer and a condenser tube. After vacuum dehydration at 110°C for 120 minutes, cool down to 65°C, and then add 23.0 gIPDI and 22.0g HDI were reacted at 80° C. for 130 min to prepare a polyurethane prepolymer whose terminal group was -NCO group.

[0038] (2) Cool the prepolymer to 65°C, add 62.0g acetone to reduce the viscosity of the system, then add a mixed solution of 2.9g BDO and 10g acetone, add a mixture of 5.6g DMPA and 10g acetone, add 7.2g o-DHPT and The mixture of 10 g of acetone was continued to react at 65° C. for 130 min to obtain a polyurethane prepolymer solution.

[0039] (3) Cool the obtained material to 35°C, add 253.3 mL of deionized water dissolved with 4.23 g of triethylamine, and carry out neutralization and emulsification for 30 min under a high-speed shear force of 7000 r / min to obtain aqueous polyurethane dispersion.

[0040] (4) Add...

Embodiment 2

[0043] (1) Add 20.0g PBA1000, 16.0g PBA2000, 15.0g PPG1000, 27.0g PPG2000 into a 500mL four-necked flask equipped with a stirrer, a thermometer and a condenser tube, vacuum dehydrate at 110°C for 120min, then cool down to 60°C, Then, 11.0 g of TDI and 28.0 g of HDI were added while blowing nitrogen gas, and reacted at 85° C. for 120 min to obtain a polyurethane prepolymer whose terminal group was —NCO group.

[0044] (2) The resulting prepolymer is cooled to 55°C, 70.0g of acetone is added to reduce the viscosity of the system, then a mixed solution of 2.4g of BDO and 10g of acetone is added, a mixture of 5.6g of DMPA and 10g of acetone is added, and 6.3g of p-DHPT is added The mixture with 10 g of acetone was continued to react at 65° C. for 150 min to obtain a polyurethane prepolymer solution.

[0045] (3) Cool the obtained material to 30°C, add 255.6 mL of deionized water in which 4.23 g of triethylamine is dissolved, and carry out neutralization and emulsification for 20 m...

Embodiment 3

[0049] (1) Add 28.0g PEBA2000, 23.0g PTMG1000, and 33.0g PTMG2000 into a 500mL four-neck flask equipped with a stirrer, thermometer and condenser tube. After vacuum dehydration at 110°C for 120min, cool down to 70°C, and then blow nitrogen While adding 10.0 g of MDI and 25.0 g of HDI, react at 75° C. for 150 min to obtain a polyurethane prepolymer whose terminal group is -NCO group.

[0050] (2) The prepolymer of gained is cooled to 60 ℃, adds the viscosity of 85g acetone reduction system, then adds the mixed solution of 1.6gBDO and 10g acetone, adds the mixture of 5.5g DMPA and 10g acetone, adds 3.8g p-DHPT and The mixture of 10 g of acetone was continued to react at 65° C. for 120 min to obtain a polyurethane prepolymer solution.

[0051] (3) Cool the obtained material to 40°C, add 250.3mL of deionized water dissolved with 4.15g of triethylamine, and carry out neutralization and emulsification for 20min under a high-speed shear force with a rotational speed of 6500r / min to o...

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Abstract

The invention belongs to the technical field of functional coatings, and discloses polyurethane aqueous dispersion, and a preparation method and application thereof. The preparation method comprises the steps of reacting polymer polyol and polyisocyanates to obtain a terminal-NCO based prepolymer; then adding a micromolecule chain extender under the condition of an organic solvent, a functionality chain extender containing -OH and -CN base, and a hydrophilic chain extender containing carboxyl, and reacting to obtain a polyurethane prepolymer solution; neutralizing and emulsifying the solution, adding a micromolecule post chain extender for reacting, removing the organic solvent after finishing reaction, and obtaining the polyurethane aqueous dispersion. According to the polyurethane aqueous dispersion, and the preparation method and the application thereof provided by the invention, the functionality chain extender containing -OH and -CN base is adopted, so that the melting temperature, the temperature of initial decomposition and the carbon yield of an obtained polyurethane aqueous dispersion latex film at 800 DEG C are remarkably improved, the water absorption is less than or equal to 7.0 percent, and the polyurethane aqueous dispersion is very suitable to be used as a base material of an expansive type waterborne polyurethane fire retardant coating.

Description

technical field [0001] The invention belongs to the technical field of functional coatings, and in particular relates to an aqueous polyurethane dispersion and its preparation method and application. Background technique [0002] Building fire protection is directly related to the safety of human life and property, especially steel structure buildings. The use of fire retardant coatings is the simplest and most effective way among many fire prevention measures. According to different flame retardant mechanisms, fire retardant coatings can be divided into two categories: non-intumescent and intumescent. When heated, the intumescent fire retardant coating can form a layer of porous honeycomb carbon foam layer that is ten or even dozens of times thicker than its own coating. It has a small thermal conductivity, is difficult to burn, hard to volatilize, and has a long fire resistance time, so it is widely used. . Since solvent-based fire retardant coatings do not conform to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/40C08G18/48C08G18/42C08G18/44C08G18/08C08G18/12C08G18/34C08G18/32C09D175/12C09D5/18
Inventor 张燕红夏正斌
Owner SOUTH CHINA UNIV OF TECH
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