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A kind of 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: 2017-02-22
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of preparation method of water-based nitrocellulose emulsion and nitrocellulose film
  • A kind of preparation method of water-based nitrocellulose emulsion and nitrocellulose film

Examples

Experimental program
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preparation example Construction

[0019] In the preparation method of the aqueous nitrocellulose emulsion of the present invention, 1.0-5.0g of hydroxyethyl acrylate, 2.0-8.0g of acrylic acid, 10-20g of methyl ethyl ketone are added into a four-necked flask equipped with a stirrer, a thermometer and a reflux condenser, and 0.5 -2.5g of recrystallized azobisisobutyronitrile as the initiator, react at 50-90℃ for 2-3h; after the reaction, under the protection of nitrogen, add 4A molecular sieve dehydrated 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 heat to 70-95°C and add nitrocellulose containing 2.0-5.0g nitrocellulose The methyl ethyl ketone solution is incubated for 2-3h; then the temperature is lowered to 30-60°C, the pH value of the reaction system obtained by adding the sodium hydroxide section to 8-9, then 60mL deionized water is added at a stirring speed of 800rpm, and the temperature is dispersed. Make it uniform i...

Embodiment 1

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

[0023] Preparation of nitrocellulose film: pour the emulsion into a polytetrafluoroethylene board...

Embodiment 2

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

[0026] Preparation of nitrocellulose film: pour the emulsion into a polytetrafluoroethylene boar...

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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 method for preparing a nitrocellulose emulsion and a nitrocellulose film, in particular to a method for preparing an aqueous nitrocellulose emulsion and a nitrocellulose film. 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 (nitrocellulose). Traditional nitro coatings are solvent-based. It has the advantages of fast drying rate, high hardness, polishing, easy repair, and large-scale construction. It is widely used in furniture and household coating, transportation repair paint, stationery and other fields. However, the high VOC content of traditional nitro coatings is likely to cause air pollution and cause serious physical harm to the constructors. In recent years, people’s awareness of environmental crisis has been continuously improved, and national environmental supervision has been continuously inc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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