阅读说明：本技术 一种脱漆剂乳液及其制备方法 (Paint remover emulsion and preparation method thereof ) 是由 彭新华 李章帅 于 2019-12-06 设计创作，主要内容包括：本发明涉及一种脱漆剂乳液及其制备方法,该乳液由质量比为1:1的水相和油相组成。以乳液的质量百分比计,水相包含纳米SiO<Sub>2</Sub>粒子0.15％～0.4％、表面活性剂0.05％～0.2％、聚合物0.15％～1.5％、水44.4％～47.65％和醇类2％～3.5％,油相包含氯代物25％、苯甲醇5％、酮类5％、有机酸类5％、醚类5％。本发明将Picerking乳化的概念应用到了脱漆剂的制备中,使乳液的稳定性大大增加,最稳定的乳液可达到1个月内不发生相分离。同时,降低了脱漆剂的生产成本。(The invention relates to paint remover emulsion and a preparation method thereof, wherein the emulsion consists of a water phase and an oil phase in a mass ratio of 1: 1. The water phase contains nano SiO in percentage by mass of the emulsion 2 0.15-0.4% of particles, 0.05-0.2% of surfactant, 0.15-1.5% of polymer, 44.4-47.65% of water and 2-3.5% of alcohols, and the oil phase comprises 25% of chloride, 5% of benzyl alcohol, 5% of ketones, 5% of organic acids and 5% of ethers. The invention applies the concept of Picerking emulsification to the preparation of the paint remover, so that the stability of the emulsion is greatly increased, and the most stable emulsion can not be separated in 1 month. Meanwhile, the production cost of the paint remover is reduced.)

1. A paint remover emulsion is characterized by comprising a water phase and an oil phase in a mass ratio of 1:1, wherein the emulsion comprises the following components in percentage by mass,the aqueous phase contains nano SiO₂0.15-0.4% of particles, 0.05-0.2% of surfactant, 0.15-1.5% of polymer, 44.4-47.65% of water and 2-3.5% of alcohols, and the oil phase contains 25% of chlorohydrocarbon, 5% of benzyl alcohol, 5% of ketones, 5% of organic acids and 5% of ethers.

2. The paint stripper emulsion of claim 1 wherein the surfactant is one or more of cetyltrimethylammonium bromide, sodium lauryl sulfate, sodium dodecylbenzene sulfonate, sorbitan fatty acid esters, and sorbitan monooleate polyoxyethylene ether.

3. The stripper emulsion of claim 1 wherein the polymer is polyvinylpyrrolidone K22-K27 with Mw 40000.

4. The paint stripper emulsion of claim 1 wherein the alcohol is one or more of methanol, ethanol, isopropanol, benzyl alcohol, and 1, 4-butanediol.

5. The paint stripper emulsion of claim 1 wherein the chloride is one or more of methylene chloride, 1, 2-dichloroethane, chlorobenzene, benzyl chloride; the ketone is one or more of acetone, butanone, pentanone and propiophenone; the organic acid is one or more of formic acid, oleic acid and benzoic acid; the ethers include one or two of anisole and phenetole.

6. A process for preparing a stripper emulsion according to any of claims 1 to 5, comprising the steps of:

(1) preparation of the aqueous phase

Placing the nano particles, the surfactant and the polymer in water, adding alcohol, and violently stirring to obtain a water phase;

(2) preparation of the oil phase

Putting the components of the oil phase in a container, and carrying out ultrasonic treatment for 5-30 min to fully mix the components;

(3) and (3) an emulsification process:

and slowly dripping the water phase into the oil phase at a stirring speed of 100-3000 r.m.p, and stirring for 30min to obtain the paint remover emulsion.

7. The method of claim 6, wherein in step (1), the vigorous stirring is at 1000 r.m.p. for 24 h.

8. A paint stripper comprising the paint stripper emulsion of any of claims 1-5 and a thickener.

9. A preparation method of a paint remover is characterized in that a thickening agent is placed in the paint remover emulsion disclosed by any one of claims 1-5, and the paint remover is obtained by stirring for 10min at the temperature of 100-3000 r.m.p.

Technical Field

The invention belongs to the field of preparation of paint remover emulsions, and particularly relates to a paint remover emulsion and a preparation method thereof.

Technical Field

After the coating on the surface of the commodity works for a certain time, the local coating can bulge and fall off due to ultraviolet irradiation and corrosion of acid rain and chemicals after being exposed in the air for a long time. In this case, the paint on the surface of the commercial product needs to be removed completely by using the paint remover, and then the commercial product is coated secondarily or the base material of the commercial product needs to be recovered, so that the amount of the paint remover required is enormous. The emulsion paint remover has the advantages of high paint removing speed, good paint removing effect, convenient use and the like, and is widely used.

At present, the emulsion paint remover formulation mostly uses conventional anionic, cationic or nonionic surfactants to emulsify the oil and water phases. Most paint strippers contain complex oil phase, and contain solvents with density higher than that of water and solvents with density lower than that of water, so that the solvents in the paint stripper have large density difference. This easily results in separation of the oil and water phases of the emulsion due to the action of gravity. Meanwhile, some paint remover emulsions are very acidic or basic, and even some paint removers have strong oxidizability. These strong acids, bases or strongly oxidizing substances in the emulsion can react with the surfactant, rendering the surfactant ineffective, eventually leading to oil-water phase separation of the paint stripper emulsion, rendering the paint stripper ineffective.

Disclosure of Invention

In view of the technical deficiencies described above, the present invention provides a paint stripper emulsion and a method for preparing the same. The invention applies the concept of Picerking emulsification to the preparation of the paint remover, and the system of nano particles, surfactant and polymer is used to greatly increase the stability of the paint remover emulsion.

The paint remover emulsion consists of a water phase and an oil phase in a mass ratio of 1:1, wherein the water phase contains nano SiO in percentage by mass₂0.15-0.4% of particles, 0.05-0.2% of surfactant, 0.15-1.5% of polymer, 44.4-47.65% of water and 2-3.5% of alcohols, and the oil phase contains 25% of chlorohydrocarbon, 5% of benzyl alcohol, 5% of ketones, 5% of organic acids and 5% of ethers.

Further, the surfactant is one or more of Cetyl Trimethyl Ammonium Bromide (CTAB), Sodium Dodecyl Sulfate (SDS), Sodium Dodecyl Benzene Sulfonate (SDBS), sorbitan fatty acid ester (Span80) and sorbitan monooleate polyoxyethylene ether (Tween 80).

Further, the polymer is polyvinylpyrrolidone (PVP), and the specification is preferably PVPK22-K27, and Mw 40000.

Further, the alcohol is one or more of methanol, ethanol, isopropanol, benzyl alcohol and 1, 4-butanediol.

Further, the chlorinated hydrocarbon is one or more of dichloromethane, 1, 2-dichloroethane, chlorobenzene and benzyl chloride.

Further, the ketone is one or more of acetone, butanone, pentanone and propiophenone.

Further, the organic acid is one or more of formic acid, oleic acid and benzoic acid.

Further, the ethers include either or both of anisole and phenetole.

The invention also provides a paint remover, which is prepared by adding a thickening agent into the paint remover emulsion and stirring for 10min at a stirring speed of 100-3000 r.m.p., wherein the thickening agent is cellulose.

The preparation method of the paint remover emulsion comprises the following steps:

(1) preparation of the aqueous phase

Placing the nano particles, the surfactant and the polymer in water, adding alcohol, and violently stirring to obtain a water phase;

(2) preparation of the oil phase

Putting the components of the oil phase in a container, and carrying out ultrasonic treatment for 5-30 min to fully mix the components;

(3) and (3) an emulsification process:

and (3) placing the oil phase under a mechanical stirrer, stirring at the speed of 100-3000 r.m.p, slowly dropwise adding the water phase into the oil phase, and stirring for 30min to obtain the paint remover emulsion.

Further, in the step (1), vigorous stirring means stirring at 1000 r.m.p. for 24 hours.

Compared with the prior art, the invention has the advantages that: (1) the prepared emulsion can be stable for more than 1 month, and the thickened emulsion is more stable. (2) The dosage of the surfactant is reduced, and the production cost of the paint remover is reduced. (3) The water content of the formula can reach 50 percent, and the greenness of the formula is improved.

Detailed Description

In order to make the content of the present invention more clearly understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below.

Nano SiO₂The particles function as: when the nano particles are used as an emulsifier to be mixed with oil and water, the nano particles are adsorbed on an oil-water interface, so that a layer of hard particle shell is formed on the surface of dispersed phase droplets, the droplets are prevented from coalescence, and meanwhile, oil-water phase separation caused by gravity due to density difference of paint remover oil phase can be prevented. WhileAnd the nano particles have stable performance, acid resistance, alkali resistance and oxidation resistance, and are not easily influenced by strong acid, alkali and oxidizing substances in the emulsion.

The function of the surfactant is as follows: each class of nanoparticles has its own lipophilicity. For a specific paint remover formula, the hydrophile lipophile of a certain type of nano particles can not meet the requirements of the formula, and effective coating is difficult to form on an oil-water interface. The surfactant adjusts the hydrophilicity and lipophilicity of the nano particles through interaction with the nano particles so as to meet the requirements of a formula, and the nano particles form effective coating on an oil-water interface. Meanwhile, the surfactant serving as a surfactant can reduce the oil-water interfacial tension, so that the tendency of coalescence of emulsion droplets is reduced.

The polymer functions as: the polymer can form a three-dimensional network structure in the emulsion to prevent the nanoparticles and the surfactant adsorbed at the oil-water interface from being displaced, so that the emulsion becomes more stable. Meanwhile, the polymer can also reduce the oil-water interfacial tension.

The function of the thickening agent is as follows: the thickening agent is used for increasing the viscosity of the paint remover emulsion, so that the paint remover can meet the application requirements of different scenes. The thickener is cellulose, and can be one or more of methylcellulose, hydroxypropyl cellulose and hydroxypropyl methylcellulose, and is prepared by mixing 0.05% of methylcellulose and 0.05% of hydroxypropyl cellulose based on the total weight of the paint remover emulsion.