Preparation method of acrylic-resin-modified water-based nitrocellulose emulsion for paint

A technology of acrylic resin and nitrocellulose, applied in the direction of coating, can solve the problems of low flexibility, low fullness and poor stability of the coating film, and achieve the effects of good flexibility, simple preparation process and high stability

Inactive Publication Date: 2013-08-14
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation methods of existing water-based nitrocellulose emulsions include external emulsification, phase inversion emulsification, and seed emulsion polymerization. The water-based nitrocellulose emulsions prepared by these methods have poor stability, low film flexibility, poor water resistance, and poor adhesion. Weakness, low fullness and other defects, only have certain application in leather finishing

Method used

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  • Preparation method of acrylic-resin-modified water-based nitrocellulose emulsion for paint
  • Preparation method of acrylic-resin-modified water-based nitrocellulose emulsion for paint
  • Preparation method of acrylic-resin-modified water-based nitrocellulose emulsion for paint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Synthesis of nitrocellulose emulsion:

[0025] 1.1) Under nitrogen protection, 0.05g of dehydrated dibutyltin dilaurate, 4.48g of isophorone diisocyanate (IPDI) trimer, and 3.33g of N-methylpyrrolidone were dissolved in 2.01g of dimethylolpropane Add acid (DMPA) into a four-necked flask equipped with a stirrer, a thermometer, and a reflux condenser to obtain a reaction system; among them, the dehydrated dibutyltin dilaurate is obtained by dehydrating dibutyltin dilaurate with 4A molecular sieve for 1 day ;

[0026] 1.2) React the reaction system at a constant temperature of 40°C for 1 hour, then raise the temperature to 72°C, add a butanone solution of nitrocellulose with a mass concentration of 25%, and keep the reaction for 2 hours to obtain a reaction solution; wherein, the added nitrocellulose butanone The nitrocellulose in the ketone solution is 7.0g;

[0027] 1.3) Cool the reaction solution to 40°C, add triethylamine to adjust the pH of the reaction solution ...

Embodiment 2

[0031] 1) Synthesis of nitrocellulose emulsion:

[0032] 1.1) Under nitrogen protection, 0.05g of dehydrated dibutyltin dilaurate, 4.68g of isophorone diisocyanate (IPDI) trimer, and 3.33g of N-methylpyrrolidone were dissolved in 2.11g of dimethylolpropane Add acid (DMPA) into a four-necked flask equipped with a stirrer, a thermometer, and a reflux condenser to obtain a reaction system; among them, the dehydrated dibutyltin dilaurate is 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 72°C, add a butanone solution of nitrocellulose with a mass concentration of 27%, and keep the reaction for 2 hours to obtain a reaction solution; wherein, the added nitrocellulose butanone The nitrocellulose in the ketone solution is 7.2g;

[0034] 1.3) Cool the reaction solution to 40°C, add triethylamine to adjust the pH of the reaction solution ...

Embodiment 3

[0038] 1) Synthesis of nitrocellulose emulsion:

[0039] 1.1) Under nitrogen protection, 0.05g of dehydrated dibutyltin dilaurate, 4.98g of isophorone diisocyanate (IPDI) trimer, and 3.33g of N-methylpyrrolidone were dissolved in 2.21g of dimethylol Add propionic acid (DMPA) into a four-necked flask equipped with a stirrer, a thermometer, and a reflux condenser to obtain a reaction system; among them, the dehydrated dibutyltin dilaurate is obtained by dehydrating dibutyltin dilaurate with 4A molecular sieve for 1 day of;

[0040] 1.2) React the reaction system at a constant temperature of 45°C for 1 hour, then raise the temperature to 72°C, add a butanone solution of nitrocellulose with a mass concentration of 28%, and keep the reaction for 2 hours to obtain a reaction solution; wherein, the added nitrocellulose butanone The nitrocellulose in the ketone solution is 7.3g;

[0041] 1.3) Cool the reaction solution to 40°C, add triethylamine to adjust the pH of the reaction solu...

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Abstract

The invention provides a preparation method of an acrylic-resin-modified water-based nitrocellulose emulsion for paint, which comprises the following steps: in an oxygen-free environment, reacting dehydrated dibutyltin dilaurate, isophorone diisocyanate tripolymer and N-methylpyrrolidone dissolved dimethylolpropionic acid at 40-45 DEG C for 1 hour, adding butanone dissolved nitrocellulose at 72 DEG C to react for 2 hours, cooling to 40 DEG C, regulating the pH value of the reaction solution to 8-9, cooling to room temperature, and adding water into the reaction solution while stirring uniformly to obtain a water-based nitrocellulose emulsion; and physically mixing the water-based acrylic emulsion and water-based nitrocellulose emulsion at room temperature to obtain the acrylic-resin-modified water-based nitrocellulose emulsion for paint. The preparation technique is simple; and the prepared acrylic-resin-modified water-based nitrocellulose emulsion for paint has the advantages of high stability, high flexibility, high adhesive force, certain fullness, yellowing resistance, water resistance and no pollution.

Description

technical field [0001] The invention relates to a preparation method of a paint film-forming material, in particular to a preparation method of an acrylic resin modified water-based nitrocellulose emulsion for a paint. Background technique [0002] Nitrocellulose, also known as nitrocellulose, is a nitrate ester derivative of cellulose and is the main film-forming substance of nitro paint (nitro lacquer). Nitro varnish has fast drying speed, high hardness, can be polished, easy to repair, Large-scale construction and other advantages, it is widely used in furniture coating, car paint repair, stationery and other fields. Because nitrocellulose is insoluble in water, the traditional nitrocellulose paint is a solvent-based VOC (volatile organic compound) with a high content, causing pollution and public nuisance when used. With the continuous establishment of national environmental protection regulations and the continuous enhancement of people's awareness of environmental pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/03C08L1/18C08L33/00C09D101/18C09D133/00C08G18/79C08G18/40
Inventor 苏秀霞张丹张海宁毛敏董伟曹鹏妮郭明媛张云周丽王楠
Owner SHAANXI UNIV OF SCI & TECH
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