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Preparation method and product of self-emulsification type water-based NC (nitrocellulose) emulsion

A nitrocellulose and self-emulsifying technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of low flexibility, weak adhesion, and poor stability of the coating film, and achieve good flexibility, high adhesion, and Highly stable effect

Inactive Publication Date: 2018-03-30
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing water-based nitro coatings have defects such as poor stability, low film flexibility, poor water resistance, weak adhesion, and low fullness, and are only used in leather finishing.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Synthesis of nitrocellulose emulsion:

[0022] 1.1) Under the protection of nitrogen, add 0.04g of dehydrated dibutyltin dilaurate, 1.01g of hexamethylene diisocyanate (HDI), 0.96g of dimethylol butyric acid (DMBA) into a stirrer equipped with reflux In the four-necked flask of the condenser tube, a reaction system was obtained; wherein, the dehydration-treated dibutyltin dilaurate was obtained by dehydrating dibutyltin dilaurate with 4A molecular sieve for 1 day;

[0023] 1.2) React the reaction system at a constant temperature of 45°C for 1 hour, then raise the temperature to 75°C, add a nitrocellulose solution with a mass concentration of 16.6% dissolved in butanone, and keep it warm for 2 hours to obtain a reaction solution; among them, the added nitrocellulose The nitrocellulose in the butanone solution is 3.6 g;

[0024] 1.3) Cool the reaction solution to 40°C, add triethylamine to make the solution into a salt, react for 40min, and lower it to 25°C, then add ...

Embodiment 2

[0026] 1) Synthesis of nitrocellulose emulsion:

[0027] 1.1) Under nitrogen protection, add 0.04g of dehydrated dibutyltin dilaurate, 1.11g of hexamethylene diisocyanate (HDI), and 0.96g of dimethylolbutyric acid (DMBA) into a stirrer equipped with a reflux In the four-necked flask of the condenser tube, a reaction system was obtained; wherein, the dehydration-treated dibutyltin dilaurate was obtained by dehydrating dibutyltin dilaurate with 4A molecular sieve for 1 day;

[0028] 1.2) React the reaction system at a constant temperature at 45°C for 1 hour, then raise the temperature to 75°C, add a nitrocellulose solution with a mass concentration of 17.4% dissolved in butanone, and keep it warm for 2 hours to obtain a reaction solution; among them, the added nitrocellulose The nitrocellulose in the butanone solution is 3.8 g;

[0029] 1.3) Cool the reaction solution to 40°C, add triethylamine to make the solution into a salt, react for 40min, and lower it to 25°C, then add 50...

Embodiment 3

[0031] 1) Synthesis of nitrocellulose emulsion:

[0032] 1.1) Under the protection of nitrogen, add 0.04g of dehydrated dibutyltin dilaurate, 1.21g of hexamethylene diisocyanate (HDI), and 1.01g of dimethylolbutyric acid (DMBA) into a stirrer equipped with reflux In the four-necked flask of the condenser tube, a reaction system was obtained; wherein, the dehydration-treated dibutyltin dilaurate was obtained by dehydrating dibutyltin dilaurate with 4A molecular sieve for 1 day;

[0033] 1.2) React the reaction system at a constant temperature of 45°C for 1 hour, then raise the temperature to 75°C, add a nitrocellulose solution with a mass concentration of 18.2% dissolved in butanone, and keep it warm for 2 hours to obtain a reaction solution; among them, the added nitrocellulose The nitrocellulose in the butanone solution is 4.0 g;

[0034] 1.3) Cool the reaction solution to 40°C, add triethylamine to make the solution into a salt, react for 40min, and lower it to 25°C, then a...

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PUM

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Abstract

The invention provides a preparation method of self-emulsification type water-based NC (nitrocellulose) emulsion. Under the nitrogen gas protection, dibutyltin dilaurate, HDI (hexamethylene diisocyanate) and DMBA (dimethylolbutanoic acid) subjected to dehydration treatment are added into a four-mouth flask; reaction is performed for 1h at 45 DEG C; then, NC subjected to butanone dissolution is added; the temperature is raised to 75 DEG C; reaction is performed for 2h; then, the temperature is lowered to 40 DEG C; triethylamine salt with the identical amount of substance as the DMBA is added; reaction is performed for 40min; next, the temperature is lowered to 25 DEG C; under the high-speed stirring, 50ml of deionized water is added into reaction liquid for emulsification; reaction is performed for 30min; the self-emulsification type water-based NC emulsion is obtained. The invention also discloses the self-emulsification type water-based NC emulsion prepared by the method. The preparation process is simple; the prepared emulsion has excellent performance of high stability, good flexibility, high adhesive force, certain fullness, yellowing resistance, water resistance and green andenvironment-friendly effects.

Description

technical field [0001] The invention relates to the technical field of polymer emulsions, in particular to a preparation method and product of a self-emulsifying water-based nitrocellulose emulsion. Background technique [0002] Nitrocellulose, also known as nitrocellulose, is a nitrate ester derivative of cellulose and is the main film-forming substance of nitro lacquer. Nitro lacquer has the advantages of fast drying speed, high hardness, sandability, easy repair, and suitable for large-scale construction. , It is widely used in the painting of home and furniture, paint repair of automobiles, ships and other vehicles, stationery and other fields. Traditional nitro paints are high in VOC (Volatile Organic Compounds), which can be harmful to the environment. However, water-based nitrocellulose paint retains most of the advantages of solvent-based nitrocellulose paint and is made by introducing hydrophilic groups. Existing water-based nitro-based coatings have defects such ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/73C08G18/64C08G18/34C08J3/07C09D175/04
CPCC08G18/348C08G18/6484C08G18/73C08J3/07C08J2375/04C09D175/04
Inventor 苏秀霞张蓉张婧贺生卓霍文静张海宁
Owner SHAANXI UNIV OF SCI & TECH
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