CN116023832A - Water-based strippable paint and preparation method thereof, protective film and preparation method thereof - Google Patents
Water-based strippable paint and preparation method thereof, protective film and preparation method thereof Download PDFInfo
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- CN116023832A CN116023832A CN202211679552.0A CN202211679552A CN116023832A CN 116023832 A CN116023832 A CN 116023832A CN 202211679552 A CN202211679552 A CN 202211679552A CN 116023832 A CN116023832 A CN 116023832A
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Abstract
The invention relates to the technical field of protective films, and discloses a water-based strippable paint and a preparation method thereof, a protective film and a preparation method of the protective film. The preparation method of the water-based strippable paint comprises the following steps: s1, preparing a pre-emulsion; s2, synthesizing acrylic emulsion; s3, preparing modified silica sol; s4, obtaining the water-based strippable coating. The protective film formed by the aqueous strippable coating has the following advantages: firstly, the material has certain inertia, does not react with the surface of the protected material, and does not damage or influence the surface characteristics of the material; second, have excellent adhesion property; thirdly, the protective film can keep adhesive force under different climatic conditions, the peeling strength is not obviously increased for a period of time or for a long time, the protective film is easy to remove, and no adhesive mark is left on the surface of the material after the protective film is removed; fourth, the protective film has good production practicality and ultraviolet ray isolation capability.
Description
Technical Field
The invention relates to the technical field of protective films, in particular to a water-based strippable paint and a preparation method thereof, a protective film and a preparation method of the protective film.
Background
Since various instruments, equipment, glass or steel materials are contaminated by various physical and chemical processes during production or transportation and the protective materials are antifouling during construction such as decoration, there is an urgent need for a material that can be temporarily protected to reduce such damages. The traditional temporary protection method mainly comprises the steps of wrapping a plastic film, waxing paper, waxing, coating protective oil or pollution, reducing the cost of protective labor, ensuring the protective effect to be not tight, easily forming residues and seriously affecting the appearance of an object.
To solve this problem, a protective film of rubber-type glue has been used in japan, the united states, and the like at the earliest, providing temporary protection against dust, dirt, grease, and even weld spatter for various substrates including glass, metal, and plastic. Is easy to be peeled off from the surface of the substrate without damaging or penetrating the substrate. Even when exposed to ultraviolet light and weather for a long period of time, excellent peelability can be maintained.
However, due to the limitation of some conditions, the ultraviolet light cannot be cut off, so that most of the ultraviolet light penetrates through the protective film, the protective film is aged quickly, and the service life of the protective film is shortened.
Disclosure of Invention
The invention aims to provide an environment-friendly and easily-torn protective film, which solves the problems in the background technology,
in order to achieve the above object, a first aspect of the present invention provides a method for preparing an aqueous strippable paint, comprising:
s1, preparing a pre-emulsion
Weighing the emulsifier and deionized water according to the measurement, and stirring until the emulsifier is completely dissolved; adding mixed monomers into the mixed solution, stirring and emulsifying to obtain a pre-emulsion with an oil-water ratio of 7:3; wherein the mixed monomer comprises styrene and butyl acrylate;
s2, synthesizing acrylic emulsion
Adding deionized water with metering requirement into the pre-emulsion obtained in the step S1, and introducing N 2 When the temperature of the constant-temperature water bath kettle is increased to 80 ℃, adding a pre-prepared initiator aqueous solution, polymerizing at constant temperature for 40min, and then dripping pre-emulsion to obtain acrylic emulsion;
s3, preparing modified silica sol
Taking a certain amount of alkaline silica sol in a container provided with a reflux device, dissolving a calculated amount of silane coupling agent in absolute ethyl alcohol to form a solution, and dropwise adding the solution into the alkaline silica sol under the condition of stirring to obtain modified silica sol;
s4, obtaining the water-based strippable coating
Respectively pouring the modified silica sol and the acrylic emulsion into a container according to the proportion, and stirring to obtain mixed emulsion; and (3) dropwise adding a proper amount of wetting dispersant, thickener and defoamer under slow stirring, and continuously stirring to uniformly mix various auxiliary agents to obtain the water-based strippable coating.
The protective film formed by the aqueous strippable coating has the following advantages: firstly, the material has certain inertia, does not react with the surface of the protected material, and does not damage or influence the surface characteristics of the material; secondly, the adhesive has excellent adhesive property, and the protective film adhered on the surface of the material cannot be damaged or fall off in the production and processing and transportation and storage processes of the material; thirdly, the protective film can keep adhesive force under different climatic conditions, the peeling strength is not obviously increased for a period of time or for a long time, the protective film is easy to remove, and no adhesive mark is left on the surface of the material after the protective film is removed; fourth, the protective film has better production practicality and isolation capability to ultraviolet rays, can reach the production and use requirements required by the material to be protected, and the service life is prolonged.
Further, in the process of dripping the pre-emulsion, 1/4 of the aqueous solution of the initiator is added every 1 h; after the pre-emulsion is added dropwise, the temperature is kept at 82 ℃ for 5 hours, the temperature is reduced to 30 ℃, a 100-mesh filter screen is used for filtering, and a proper amount of trimethylamine ethanol is added for regulating the pH to 8-9.
Further, in S3, dropwise adding the mixture into the alkaline silica sol under the stirring condition of the rotating speed of about 250r/min, wherein the dropping speed is 2S/d; after dripping, preserving heat and stirring for 8 hours at 50-60 ℃;
further, the amounts of the silane coupling agents are 1%,3%,5%,7% of the solid content of the alkaline silica sol, and the ratio of the ethanol to the solid content of the silica sol is 1:1, respectively.
The second aspect of the invention provides an aqueous strippable coating obtained by the preparation method of the aqueous strippable coating.
The water-based strippable paint has the following advantages: firstly, the material has certain inertia, does not react with the surface of the protected material, and does not damage or influence the surface characteristics of the material; secondly, the adhesive has excellent adhesive property, and the protective film adhered on the surface of the material cannot be damaged or fall off in the production and processing and transportation and storage processes of the material; thirdly, the protective film can keep adhesive force under different climatic conditions, the peeling strength is not obviously increased for a period of time or for a long time, the protective film is easy to remove, and no adhesive mark is left on the surface of the material after the protective film is removed; fourth, the protective film has better production practicality and isolation capability to ultraviolet rays, can reach the production and use requirements required by the material to be protected, and the service life is prolonged.
The third aspect of the present invention provides a protective film production method, comprising:
s5, cleaning and drying the target spraying carrier;
s6, spraying the water-based strippable paint in the invention as defined in claim 5 on a carrier;
s7, carrying out knife coating and drying on the carrier.
Further, in S6, a proper amount of deionized water is added to dilute the coating before spraying, so that the coating can be sprayed by a spray gun; in the spraying process, the carrier is sprayed for a plurality of times, and the spraying is performed once after the coating film sprayed at the previous time is dried; after the spraying is completed, the wet film is placed in a ventilated environment to be self-dried.
Further, in S7, before blade coating, placing the carrier on a plane and fixing, and placing a proper amount of coating on one end of the substrate; in the blade coating, the blade coating was performed by a four blade wet film forming apparatus having a specification of 50 μm×75 μm×100 μm×150 μm.
A fourth aspect of the present invention provides a protective film obtained by the protective film production method.
The protective film has the following advantages: firstly, the material has certain inertia, does not react with the surface of the protected material, and does not damage or influence the surface characteristics of the material; secondly, the adhesive has excellent adhesive property, and the protective film adhered on the surface of the material cannot be damaged or fall off in the production and processing and transportation and storage processes of the material; thirdly, the protective film can keep adhesive force under different climatic conditions, the peeling strength is not obviously increased for a period of time or for a long time, the protective film is easy to remove, and no adhesive mark is left on the surface of the material after the protective film is removed; fourth, the protective film has better production practicality and isolation capability to ultraviolet rays, can reach the production and use requirements required by the material to be protected, and the service life is prolonged.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
FIG. 1 is a schematic view of one embodiment of the aqueous strippable coating of this invention and a method of making the same.
Detailed Description
The following describes specific embodiments of the present invention in detail. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
In the present invention, unless otherwise indicated, terms of orientation such as "upper and lower" are used to generally refer to orientations in the assembled state of use. "inner and outer" refer to the inner and outer relative to the contour of the components themselves.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the invention herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The first aspect of the invention provides a preparation method of a strippable paint, which comprises the following steps:
s1, preparing a pre-emulsion
Weighing the emulsifier and deionized water according to the measurement, and stirring until the emulsifier is completely dissolved; adding mixed monomers into the mixed solution, stirring and emulsifying to obtain a pre-emulsion with an oil-water ratio of 7:3; wherein the mixed monomer comprises styrene and butyl acrylate;
s2, synthesizing acrylic emulsion
Adding deionized water with metering requirement into the pre-emulsion obtained in the step S1, introducing N2, adding a pre-prepared initiator aqueous solution when the temperature of the constant-temperature water bath kettle is increased to 80 ℃, and dropwise adding the pre-emulsion after polymerizing for 40min at constant temperature to obtain an acrylic emulsion;
s3, preparing modified silica sol
And (3) taking a certain amount of alkaline silica sol in a container provided with a reflux device, dissolving a calculated amount of silane coupling agent in absolute ethyl alcohol to form a solution, and dropwise adding the solution into the alkaline silica sol under the condition of stirring to obtain the modified silica sol. The Si-O-Si chain segments formed among the silica sol particles are distributed in the coating film, so that the compactness of the coating film is improved, the bond is insoluble in water and organic solvents, has no affinity to the water and the organic solvents, and can prevent the invasion of water and other media.
S4, obtaining the water-based strippable coating
Respectively pouring the modified silica sol and the acrylic emulsion into a container according to the proportion, and stirring to obtain mixed emulsion; and (3) dropwise adding a proper amount of wetting dispersant, thickener and defoamer under slow stirring, and continuously stirring to uniformly mix various auxiliary agents to obtain the water-based strippable coating.
In the process of dripping the pre-emulsion, 1/4 of the initiator aqueous solution is added every 1 h; after the pre-emulsion is added dropwise, the temperature is kept at 82 ℃ for 5 hours, the temperature is reduced to 30 ℃, a 100-mesh filter screen is used for filtering, and a proper amount of trimethylamine ethanol is added for regulating the pH to 8-9. In S3, dropwise adding the mixture into the alkaline silica sol under the stirring condition of the rotating speed of about 250r/min, wherein the dropping speed is 2S/d; after the dripping is finished, the mixture is stirred for 8 hours at the temperature of 50-60 ℃. The amount of the silane coupling agent is 1 percent, 3 percent, 5 percent and 7 percent of the solid content of the alkaline silica sol, and the proportion of the ethanol to the solid content of the silica sol is 1:1.
The protective film formed by the aqueous strippable coating has the following advantages: firstly, the material has certain inertia, does not react with the surface of the protected material, and does not damage or influence the surface characteristics of the material; secondly, the adhesive has excellent adhesive property, and the protective film adhered on the surface of the material cannot be damaged or fall off in the production and processing and transportation and storage processes of the material; thirdly, the protective film can keep adhesive force under different climatic conditions, the peeling strength is not obviously increased for a period of time or for a long time, the protective film is easy to remove, and no adhesive mark is left on the surface of the material after the protective film is removed; fourth, the protective film has better production practicality and isolation capability to ultraviolet rays, can reach the production and use requirements required by the material to be protected, and the service life is prolonged.
In another alternative preparation method, as shown in fig. 1, deionized water, a dispersing agent, a film forming agent, a thickening agent and a leveling agent are mixed to form a mixed solution, and a modified silicon solution, an aqueous acrylic emulsion, a defoaming agent and a multifunctional auxiliary agent are added to finally obtain the wake-up strippable coating.
In a second aspect, the present invention provides an aqueous strippable coating. The water-based strippable paint is obtained by the preparation method of the water-based strippable paint. The water-based strippable paint has the following advantages: firstly, the material has certain inertia, does not react with the surface of the protected material, and does not damage or influence the surface characteristics of the material; secondly, the adhesive has excellent adhesive property, and the protective film adhered on the surface of the material cannot be damaged or fall off in the production and processing and transportation and storage processes of the material; thirdly, the protective film can keep adhesive force under different climatic conditions, the peeling strength is not obviously increased for a period of time or for a long time, the protective film is easy to remove, and no adhesive mark is left on the surface of the material after the protective film is removed; fourth, the protective film has better production practicality and isolation capability to ultraviolet rays, can reach the production and use requirements required by the material to be protected, and the service life is prolonged.
The third aspect of the present invention provides a protective film production method, comprising:
s5, cleaning and drying the target spraying carrier;
s6, spraying the water-based strippable paint in the invention as defined in claim 5 on a carrier;
s7, carrying out knife coating and drying on the carrier.
In S6, adding a proper amount of deionized water to dilute the coating before spraying, so that the coating can be sprayed by a spray gun; in the spraying process, the carrier is sprayed for a plurality of times, and the spraying is performed once after the coating film sprayed at the previous time is dried; after the spraying is completed, the wet film is placed in a ventilated environment to be self-dried. In S7, before blade coating, placing the carrier on a plane and fixing, and taking a proper amount of coating to be placed at one end of a base material; in the blade coating, the blade coating was performed by a four blade wet film forming apparatus having a specification of 50 μm×75 μm×100 μm×150 μm.
The doctor blade coating can improve the flatness of the coating film on one hand, and can fill gaps generated by spraying on the other hand, so that the compactness of the coating film is improved.
In an alternative specific embodiment, the prepared coating is soaked in 12h of strong acid and alkali solution, 48h of distilled water and 72h of brine to improve the corrosion resistance of the coating, and the coating can effectively prevent invasion of corrosive medium and protect a substrate.
A fourth aspect of the present invention provides a protective film. The protective film is obtained by a protective film preparation method.
The protective film has the following advantages: firstly, the material has certain inertia, does not react with the surface of the protected material, and does not damage or influence the surface characteristics of the material; secondly, the adhesive has excellent adhesive property, and the protective film adhered on the surface of the material cannot be damaged or fall off in the production and processing and transportation and storage processes of the material; thirdly, the protective film can keep adhesive force under different climatic conditions, the peeling strength is not obviously increased for a period of time or for a long time, the protective film is easy to remove, and no adhesive mark is left on the surface of the material after the protective film is removed; fourth, the protective film has better production practicality and isolation capability to ultraviolet rays, can reach the production and use requirements required by the material to be protected, and the service life is prolonged.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations of the invention are not described in detail in order to avoid unnecessary repetition.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
Claims (9)
1. A method for preparing an aqueous strippable coating, comprising the steps of:
s1, preparing a pre-emulsion
Weighing the emulsifier and deionized water according to the measurement, and stirring until the emulsifier is completely dissolved; adding mixed monomers into the mixed solution, stirring and emulsifying to obtain a pre-emulsion with an oil-water ratio of 7:3; wherein the mixed monomer comprises styrene and butyl acrylate;
s2, synthesizing acrylic emulsion
Adding deionized water with metering requirement into the pre-emulsion obtained in the step S1, and introducing N 2 When the temperature of the constant-temperature water bath kettle is increased to 80 ℃, adding a pre-prepared initiator aqueous solution, polymerizing at constant temperature for 40min, and then dripping pre-emulsion to obtain acrylic emulsion;
s3, preparing modified silica sol
Taking a certain amount of alkaline silica sol in a container provided with a reflux device, dissolving a calculated amount of silane coupling agent in absolute ethyl alcohol to form a solution, and dropwise adding the solution into the alkaline silica sol under the condition of stirring to obtain modified silica sol;
s4, obtaining the water-based strippable coating
Respectively pouring the modified silica sol and the acrylic emulsion into a container according to the proportion, and stirring to obtain mixed emulsion; and (3) dropwise adding a proper amount of wetting dispersant, thickener and defoamer under slow stirring, and continuously stirring to uniformly mix various auxiliary agents to obtain the water-based strippable coating.
2. The method for preparing the water-based strippable paint according to claim 1, wherein 1/4 of the aqueous initiator solution is added every 1 hour during the dropping of the pre-emulsion; after the pre-emulsion is added dropwise, the temperature is kept at 82 ℃ for 5 hours, the temperature is reduced to 30 ℃, a 100-mesh filter screen is used for filtering, and a proper amount of trimethylamine ethanol is added for regulating the pH to 8-9.
3. The method for preparing an aqueous strippable paint according to claim 1, wherein in S3, the strippable paint is dropwise added to the alkaline silica sol under stirring at a rotation speed of about 250r/min at a dropping speed of 2S/d; after the dripping is finished, the mixture is stirred for 8 hours at the temperature of 50-60 ℃.
4. The method for preparing the water-based strippable paint according to claim 1 or 3, wherein the amount of the silane coupling agent is 1%,3%,5%,7% of the solid content of the alkaline silica sol, and the ratio of the ethanol to the solid content of the silica sol is 1:1.
5. An aqueous strippable paint obtained by the method of producing an aqueous strippable paint according to any one of claims 1 to 4.
6. A protective film manufacturing method, characterized in that the protective film manufacturing method comprises:
s5, cleaning and drying the target spraying carrier;
s6, spraying the water-based strippable paint in the invention as defined in claim 5 on a carrier;
s7, carrying out knife coating and drying on the carrier.
7. The method of preparing a protective film according to claim 6, wherein in S6, a proper amount of deionized water is added to dilute the paint before spraying so that the paint can be sprayed with a spray gun; in the spraying process, the carrier is sprayed for a plurality of times, and the spraying is performed once after the coating film sprayed at the previous time is dried; after the spraying is completed, the wet film is placed in a ventilated environment to be self-dried.
8. The method of producing a protective film according to claim 7, wherein in S7, before blade coating, the carrier is placed on a flat surface and fixed, and a proper amount of paint is placed on one end of the substrate; in the blade coating, the blade coating was performed by a four blade wet film forming apparatus having a specification of 50 μm×75 μm×100 μm×150 μm.
9. A protective film, characterized in that the protective film is obtained by the protective film preparation method of the aqueous strippable coating material according to any one of claims 6 to 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211679552.0A CN116023832A (en) | 2022-12-26 | 2022-12-26 | Water-based strippable paint and preparation method thereof, protective film and preparation method thereof |
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| CN202211679552.0A CN116023832A (en) | 2022-12-26 | 2022-12-26 | Water-based strippable paint and preparation method thereof, protective film and preparation method thereof |
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| CN116023832A true CN116023832A (en) | 2023-04-28 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109734837A (en) * | 2018-12-19 | 2019-05-10 | 常熟巴德富科技有限公司 | A kind of water-resistant type K11 lotion and preparation method thereof |
| CN112625515A (en) * | 2021-01-06 | 2021-04-09 | 成都亢倡菱涂料科技有限公司 | Preparation method of high-strength water-based strippable composite coating |
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- 2022-12-26 CN CN202211679552.0A patent/CN116023832A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109734837A (en) * | 2018-12-19 | 2019-05-10 | 常熟巴德富科技有限公司 | A kind of water-resistant type K11 lotion and preparation method thereof |
| CN112625515A (en) * | 2021-01-06 | 2021-04-09 | 成都亢倡菱涂料科技有限公司 | Preparation method of high-strength water-based strippable composite coating |
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