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Paint remover emulsion and preparation method thereof

A paint stripper and emulsion technology, applied in the field of paint stripper emulsion preparation, can solve problems such as paint stripper failure, surfactant failure, emulsion oil-water phase separation, etc., to reduce production costs, improve greening, and stabilize emulsions Effect

Inactive Publication Date: 2020-02-28
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the oil phase contained in most paint removers is relatively complex, containing solvents with a higher density than water and solvents with a lower density than water, which makes the solvents in the paint remover formula have a large difference in density.
This tends to cause the oil-water phase separation of the emulsion due to gravity
At the same time, some paint remover emulsions are very acidic or alkaline, and even some paint removers have strong oxidizing properties.
These strong acids, strong bases or strong oxidizing substances in the emulsion will react with the surfactant, making the surfactant ineffective, and finally causing the oil-water phase separation of the paint remover emulsion, making the paint remover ineffective

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 0.15% nano-SiO 2 (DEGUSSA hydrophilic silica A380), 0.05% of surfactant SDS and 0.15% of polymer PVP are placed in 47.65% of water, and 2% of methanol is added at the same time, stirred at 1000r.m.p for 24h, dubbed The aqueous phase of the lacquer. Prepare organic solvents such as 25% dichloromethane, 5% benzyl alcohol, 5% propiophenone, 5% formic acid, 5% oleic acid, and 5% anisole in proportion, put them in a beaker and ultrasonically for 20 minutes to fully mix all the solvents . The prepared oil phase was placed under a mechanical stirrer with a stirring speed of 1000 r.m.p. Then, slowly drop the prepared water phase into the oil phase, and stir for 30 minutes to prepare a paint remover emulsion. Finally, add a thickener to the prepared paint remover emulsion, and stir for 10 minutes at a stirring speed of 1000 r.m.p to prepare a paint remover with good stability. The prepared paint remover emulsion is placed at room temperature, and phase separation does not oc...

Embodiment 2

[0032] 0.2% nano-SiO 2 , 0.1% surfactant SDS and 0.5% polymer PVP are placed in 46.2% water, and 3% isopropanol is added at the same time, stirred at 1000r.m.p for 24h to form the aqueous phase of the paint remover. 20% of the organic solvent dichloromethane, 5% of 1,2-dichloroethane, 5% of benzyl alcohol, 5% of acetone, 10% of formic acid, 5% of phenetyl ether were prepared according to the proportion, and placed in a beaker for 30min sonication. All solvents are mixed thoroughly. The prepared oil phase was placed under a mechanical stirrer with a stirring speed of 800r.m.p. Then, slowly drop the prepared water phase into the oil phase, and stir for 30 minutes to prepare a paint remover emulsion. Finally, add a thickener to the prepared paint remover emulsion, and stir for 10 minutes at a stirring speed of 800 r.m.p to prepare a paint remover with good stability. The prepared paint remover emulsion is placed at room temperature, and phase separation does not occur after on...

Embodiment 3

[0034] 0.3% nano-SiO 2 , 0.15% surfactant CTAB and 1% polymer PVP are placed in 45.55% water, and 1.5% methanol and 1.5% isopropanol are added at the same time, stirred at 1000r.m.p for 24h to form the aqueous phase of the paint remover. Prepare organic solvents such as 20% dichloromethane, 5% 1,2-dichloroethane, 5% benzyl alcohol, 5% pentanone, 10% benzoic acid, and 5% phenetole, and place them in a beaker for 30 minutes of ultrasonication , so that all solvents are thoroughly mixed. The prepared oil phase was placed under a mechanical stirrer at a stirring speed of 1200 r.m.p. Then, slowly drop the prepared water phase into the oil phase, and stir for 30 minutes to prepare a paint remover emulsion. Finally, add a thickener to the prepared paint remover emulsion, and stir for 10 minutes at a stirring speed of 1200 r.m.p to prepare a paint remover with good stability. The prepared paint remover emulsion is placed at room temperature, and phase separation does not occur afte...

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PUM

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Abstract

The invention relates to a paint remover emulsion and a preparation method thereof. The emulsion is composed of a water phase and an oil phase in a mass ratio of 1: 1, wherein the water phase comprises the following components in percentage by mass: 0.15%-0.4% of nano SiO2 particles, 0.05%-0.2% of a surfactant, 0.15%-1.5% of a polymer, 44.4%-47.65% of water and 2%-3.5% of alcohols; and the oil phase comprises 25% of chlorides, 5% of benzyl alcohol, 5% of ketones, 5% of organic acids and 5% of ethers. According to the invention, the concept of Pickering emulsification is applied to the preparation of a paint remover, so that the stability of the emulsion is greatly improved, and the most stable emulsion can be prevented from phase separation within one month. Meanwhile, the production costof the paint remover is reduced.

Description

technical field [0001] The invention belongs to the field of preparation of paint remover emulsions, in particular to a paint remover emulsion and a preparation method thereof. [0002] technical background [0003] The coating on the surface of the product, after working for a certain period of time, due to ultraviolet radiation and long-term exposure to the air, it is corroded by acid rain and chemicals, and the local coating will bulge and fall off. At this time, it is necessary to use a paint remover to remove all the paint on the surface of the product, and then repaint the product or recycle the base material of the product, so the demand for paint remover is huge. Emulsion-type paint remover has the advantages of fast paint removal speed, good paint removal effect, and convenient use. [0004] At present, conventional anionic, cationic or nonionic surfactants are mostly used in emulsion-type paint remover formulations to emulsify the oil-water phase. However, the oil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D9/04
CPCC09D9/005C09D9/04
Inventor 彭新华李章帅
Owner NANJING UNIV OF SCI & TECH