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Preparation method of water-based nitrocellulose emulsion and nitrocellulose film

A nitrocellulose, emulsion technology, applied in the direction of coating, can solve the problems of poor adhesion, excessive residual surfactant, poor stability of dispersion system, etc., to achieve excellent water resistance and weather resistance, strong anti-ultraviolet ability, storage good stability

Active Publication Date: 2015-04-01
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

, Water resistance defects, which seriously limit its scope of use
[0003] The existing water-based nitrocellulose has prominent defects, such as poor stability of the dispersion system and excessive residual surfactant dosage, which will affect the application performance of the product (poor flexibility, poor adhesion, insufficient water resistance, low fullness and poor mechanical properties, etc.)

Method used

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  • Preparation method of water-based nitrocellulose emulsion and nitrocellulose film
  • Preparation method of water-based nitrocellulose emulsion and nitrocellulose film

Examples

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preparation example Construction

[0019] In the preparation method of the water-based nitrocellulose emulsion of the present invention, 1.0-5.0 g of hydroxyethyl acrylate, 2.0-8.0 g of acrylic acid, 10-20 g of butanone are added to a four-necked flask equipped with a stirrer, a thermometer and a reflux condenser, and 0.5 g of hydroxyethyl acrylate is added. -2.5g of recrystallized azobisisobutyronitrile was used as an initiator to react at 50-90℃ for 2-3h; after the reaction, under nitrogen protection, add 4A molecular sieve dehydration-treated dibutyltin dilaurate 0.1- 1.0g, isophorone diisocyanate (IPDI) 0.5-4.5g, and react at a constant temperature of 25-65°C for 1-2h; then raise the temperature to 70-95°C, add nitrocellulose containing 2.0-5.0g of nitrocellulose. The butanone solution was incubated for 2-3h; then the temperature was lowered to 30-60°C, the pH value of the reaction system obtained by adding sodium hydroxide was 8-9, and then 60mL of deionized water was added at a stirring speed of 800rpm, an...

Embodiment 1

[0022] Synthesis of nitrocellulose emulsion: add 1.0 g of hydroxyethyl acrylate, 8.0 g of acrylic acid, and 10 g of methyl ethyl ketone into a four-necked flask equipped with a stirrer, a thermometer and a reflux condenser, and add 1.2 g of recrystallized azobisisobutyronitrile As an initiator, the reaction was carried out at 60 °C for 2.5 h; under nitrogen protection, under nitrogen protection after the reaction, 0.6 g of dibutyltin dilaurate and 0.8 g of isophorone diisocyanate (IPDI) dehydrated by 4A molecular sieve were added to it. g, and reacted at a constant temperature of 30 °C for 1 h; then the temperature was raised to 85 °C, a nitrocellulose solution of butanone containing 5.0 g of nitrocellulose was added, and the reaction was incubated for 2 h; then the temperature was lowered to 30 °C, and sodium hydroxide was added to neutralize to pH= Add 60 mL of deionized water at a stirring speed of 8 to 9,800 rpm, keep heat for 30 minutes, and discharge to obtain an aqueous ...

Embodiment 2

[0025] Synthesis of nitrocellulose emulsion: add 4.0 g of hydroxyethyl acrylate, 2.0 g of acrylic acid, and 15 g of methyl ethyl ketone into a four-necked flask equipped with a stirrer, a thermometer and a reflux condenser, and add 1.4 g of recrystallized azobisisobutyronitrile As an initiator, the reaction was carried out at 70 °C for 2.5 h; under nitrogen protection, under nitrogen protection after the reaction, 0.7 g of dibutyltin dilaurate dehydrated by 4A molecular sieve, and 1.5 g of isophorone diisocyanate (IPDI) were added to it. g, and reacted at a constant temperature of 65 °C for 1 h; then heated to 90 °C, added nitrocellulose-butanone solution containing 2.0 g of nitrocellulose, and incubated for 2 h; then cooled to 40 °C, added sodium hydroxide to neutralize to pH= Add 60 mL of deionized water at a stirring speed of 8 to 9,800 rpm, keep heat for 30 minutes, and discharge to obtain an aqueous nitrocellulose emulsion.

[0026] Preparation of nitrocellulose film: pou...

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Abstract

The invention relates to a preparation method of a water-based nitrocellulose emulsion and a nitrocellulose film. The preparation method comprises the following steps: adding 2-hydroxyethyl acrylate, acrylic acid, butanone and azodiisobutyronitrile into a reactor, and carrying out free-radical polymerization reaction at 50-90 DEG C for 2-3 hours; after the reaction finishes, adding dibutyltin dilaurate and isophorone diisocyanate in a nitrogen protective atmosphere, carrying out thermostatic reaction at 25-65 DEG C for 1-2 hours, heating to 70-95 DEG C, adding a nitrocellulose butanone solution, and keeping the temperature to react for 2-3 hours; and cooling, regulating the pH value of the obtained reaction system to 8-9, adding deionized water, and dispersing uniformly to obtain the water-based nitrocellulose emulsion. The water-based nitrocellulose emulsion prepared by the preparation method is subjected to running film formation to obtain the nitrocellulose film. The water-based nitrocellulose emulsion has the advantages of favorable water dispersibility, favorable storage stability, high film flexibility, high adhesive force, high water resistance and high yellowing resistance.

Description

technical field [0001] The invention relates to a preparation method of a nitrocellulose emulsion and a nitrocellulose membrane, in particular to a preparation method of an aqueous nitrocellulose emulsion and a nitrocellulose membrane. Background technique [0002] The scientific name of nitrocellulose is cellulose nitrate, also known as nitrocellulose, which is the main film-forming substance of nitro paint (nitro paint). Traditional nitro paints are solvent based. It has the advantages of fast drying rate, high hardness, polishable, easy to repair, and convenient for large-scale construction. It is widely used in furniture and home painting, vehicle refinishing paint, stationery and other fields. However, the VOC content of traditional nitro coatings is too high, which not only easily causes air pollution but also causes serious physical harm to construction workers. In recent years, people's awareness of environmental protection crisis has been continuously improved, an...

Claims

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Application Information

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IPC IPC(8): C08G81/00C08G18/62C08F220/28C08F220/06C09D187/00C09D101/18
Inventor 苏秀霞赵擎霄吕檬夷卜海艳
Owner SHAANXI UNIV OF SCI & TECH
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