Waterborne polyurethane emulsion with corrosion resistance and preparation method thereof

A water-based polyurethane and anti-corrosion technology, applied in the field of coatings, can solve the problems of poor water resistance and anti-corrosion performance of the coating film, and no research reports have been seen yet, and achieve the goal of improving anti-corrosion performance, improving anti-corrosion performance, and promoting anti-corrosion performance Effect

Inactive Publication Date: 2017-10-13
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, water-based polyurethane molecules contain hydrophilic groups, and the water resistance and anti-corrosion properties of the coating film are relatively poor.
However, there have been no research reports on this

Method used

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  • Waterborne polyurethane emulsion with corrosion resistance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Add 81.0g of PPG with a molecular weight of 2000 into a 500mL four-necked flask equipped with a stirrer, a thermometer and a condenser, then add 36.0g of IPDI while blowing nitrogen, and react at 80°C for 130min to obtain a terminal group -NCO-based polyurethane prepolymer.

[0034] (2) Cool the prepolymer to 60°C, add 50.0g of acetone to reduce the viscosity of the system, then add a mixed solution of 2.8g of BDO and 10g of acetone, a mixture of 1.3g of DMPA and 10g of acetone, a mixture of 5.1g of TC4AS and 10g of acetone , and reacted at 65°C for 120 minutes to prepare a polyurethane prepolymer containing hydrophilic groups.

[0035] (3) Cool the material obtained in the previous step to 30°C, add 242.1 mL of deionized water with 3.61 g of triethylamine dissolved therein, and carry out neutralization and emulsification for 30 min under a high-speed shear force of 7000 r / min to obtain Aqueous polyurethane emulsion containing acetone.

[0036] (4) Add 2.5 g of et...

Embodiment 2

[0039] (1) Add 38.0g of PCL and 55.0g of PPG with a molecular weight of 2000 into a 500mL four-neck flask equipped with a stirrer, a thermometer and a condenser tube, heat and melt, then add HDI 29.0g while blowing nitrogen, and heat at 80°C The reaction was carried out for 120 minutes to obtain a polyurethane prepolymer whose end group is -NCO group.

[0040] (2) Cool the resulting prepolymer to 55°C, add 68.0g of acetone to reduce the viscosity of the system, then add a mixed solution of 1.4g of BDO and 10g of acetone, add a mixture of 2.3g of DMPA and 10g of acetone, add 4.2g of TC4AS and 10g of acetone The mixture was continued to react at 65°C for 100 min to obtain a polyurethane prepolymer containing hydrophilic groups.

[0041] (3) Cool the material obtained in the previous step to 35°C, add 245.8 mL of deionized water with 3.9 g of triethylamine dissolved therein, and carry out neutralization and emulsification for 20 min under a high-speed shear force with a rotationa...

Embodiment 3

[0045] (1) Add 22.0g of PCDL and 65.0g of PTMG with a molecular weight of 2000 into a 500mL four-neck flask equipped with a stirrer, a thermometer and a condenser, heat and melt, and then add 19.0g of TDI and 13.0g of HDI while blowing nitrogen , and reacted at 75°C for 130min to obtain a polyurethane prepolymer whose end group is -NCO group.

[0046] (2) Cool the prepolymer obtained to 65°C, add 73g of acetone to reduce the viscosity of the system, then add a mixed solution of 3.1g of BDO and 10g of acetone, add a mixture of 3.0g of DMPA and 10g of acetone, add 3.5g of TC4AS and 10g of acetone The mixture was continued to react at 65°C for 90 minutes to obtain a polyurethane prepolymer containing hydrophilic groups.

[0047] (3) Cool the material obtained in the previous step to 40°C, add 258 mL of deionized water dissolved with 4.07 g of triethylamine, and neutralize and emulsify for 20 minutes under a high-speed shear force of 6000 r / min to obtain Aqueous polyurethane emul...

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Abstract

The invention belongs to the technical field of coating and discloses waterborne polyurethane emulsion with corrosion resistance and a preparation method thereof. The preparation method comprises the following steps: performing a reaction on polymer polyol and polyisocyanates, so as to obtain a terminal-NCO-based prepolymer; adding a micromolecule chain extender and a hydrophilic chain extender containing thiacalixarene sulfonate into an organic solvent for reaction, so as to obtain polyurethane prepolymer solution; adding the micromolecule chain extender for reaction after neutralizing and emulsifying the polyurethane prepolymer solution; removing the organic solvent after the reaction is completed, so as to obtain the waterborne polyurethane emulsion with corrosion resistance. According to the preparation method, the contained thiacalixarene sulfonate is taken as the hydrophilic chain extender, and the waterborne polyurethane has obviously improved corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of coatings, and in particular relates to a water-based polyurethane emulsion with anti-corrosion performance and a preparation method thereof. Background technique [0002] The cost of corrosion to human beings is staggering. According to reports, the direct economic loss caused by metal corrosion in the world is more than 700 billion U.S. dollars every year, and the loss caused by metal corrosion in my country accounts for about 4% of the gross national product (GDP). Corrosion not only causes huge economic losses, but also damages the protection of natural resources and the environment. Coatings are the most economical and effective method of metal corrosion protection. At present, countries such as the United States, Britain, Japan and my country have developed a variety of anti-corrosion coatings with good performance, which are widely used in various corrosive environments and have produced obvious e...

Claims

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Application Information

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IPC IPC(8): C09D175/08C09D5/08C08G18/48C08G18/42C08G18/10C08G18/12C08G18/66C08G18/32C08G18/34C08G18/38C08G18/75C08G18/73C08G18/76
CPCC08G18/0823C08G18/0828C08G18/10C08G18/12C08G18/4018C08G18/4238C08G18/4277C08G18/44C08G18/4825C08G18/4854C08G18/6625C08G18/6692C08G18/724C08G18/73C08G18/755C08G18/7614C08G18/7671C09D5/08C09D175/08C08G18/3206C08G18/348C08G18/3874C08G18/3228
Inventor 夏正斌张燕红苏秋岚
Owner SOUTH CHINA UNIV OF TECH
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