Washable temporary protective coating and preparation method thereof

Abstract

The invention discloses a washable temporary protective coating, which is prepared from 25-35% of resin, 1-2% of pigment, 3-4% of filler, 6-11% of assistant and 5-60% of solvent, the resin is water-soluble acrylic resin, the resin is anionic coating capable of rapidly stripping under the action of washing or soaking with warm water, and the washable temporary protective coating can be rapidly washed with water in each specified time period, has no residue, and is convenient to use. And the coating has high dry belt adhesion, impact resistance and wear resistance, the surface states and glossiness of various substrates are not changed, state protection is complete, and various properties of the substrates are not affected.

Description

Technical Field

[0001] The invention belongs to the technical field of fine chemical coating materials and applications, and in particular relates to a water-washable temporary protective coating and a preparation method thereof. Background Art

[0002] With the rapid development of the domestic economy in recent years, smart phones, tablet computers, navigation systems, ATMs, etc. have already penetrated into every aspect of people's lives. The touch screen is an important part of the above products. When the touch screen cover glass is cut, edged or otherwise processed without protection, it is easy to cause a certain degree of damage to the glass surface. At present, there are many types of temporary protective coatings for touch screen cover glass, such as peelable protective glue / protective film, etc. These protective glues or films can protect the touch screen from physical damage or other pollution during production, processing or transportation and storage. In addition, various types of aviation substrates are also susceptible to damage during transportation and storage, and temporary protection is required during this period. Therefore, it is urgent to develop a temporary protective coating that is easy to remove, completely removed, low in price, and harmless to the environment.

[0003] The main methods for removing temporary protective coatings from the surface of the protected object currently include direct peeling, washing or soaking with special lotions, acid and alkaline solutions, etc. However, there are disadvantages such as difficulty in cleaning the coating, low process efficiency of film stripping, laborious film stripping, and high labor consumption. Although some products can be stripped with acid, alkaline solutions or high-temperature water (above 90°C), the film stripping time is slow, and the film will dissolve into the lotion. The cost of the film stripping process and the use of the lotion is high. At the same time, acid and alkaline solutions are corrosive to a certain extent, and high-temperature water also has problems such as easy scalding, and the safety factor is low. Some temporary protective coatings also contain volatile toxic and harmful solvents, which cause certain harm to the human body and the environment. Summary of the invention

[0004] In view of the shortcomings of existing temporary protective coatings, a coating is provided which can be quickly removed by washing with warm water or soaking, can be quickly washed with water within each specified time period without any residue, and will not affect the various properties of the substrate.

[0005] The present invention provides a water-washable temporary protective coating, which is composed of the following components by mass percentage:

[0006]

[0007]

[0008] The resin is a water-soluble acrylic resin (water-dilutable type), preferably anionic.

[0009] The pigment is phthalocyanine blue.

[0010] The filler is one or more of silicon dioxide and talcum powder.

[0011] The solvent is butanone.

[0012] The auxiliary agents include wetting and dispersing agents, defoaming agents, leveling agents, and substrate wetting agents.

[0013] The present invention also provides a method for preparing a water-washable temporary protective coating, comprising preparing materials according to the above-mentioned formula, dissolving the resin with a solvent, adding pigments and fillers after the resin is completely dissolved, adding various additives in sequence under stirring, stirring the mixture evenly with a high-speed stirrer, filtering and packaging the mixture as a finished product, and obtaining the water-washable temporary protective coating.

[0014] Beneficial Effects

[0015] The washable temporary protective coating prepared by the present invention performs temporary protective treatment on aluminum plates coated with epoxy protective coating primer / topcoat. After washing with water in the specified time periods, no residue is found and the plates can be quickly washed clean. The surface state of each aluminum plate and the glossiness of the epoxy paint are observed and recorded before coating. After the washable temporary protective coating is applied by brush and washed with water in each time period, the surface state and glossiness of the aluminum plate do not change, and the state protection is complete. The raw materials do not contain volatile toxic and harmful substances, are harmless to human health, are more environmentally friendly, and have the characteristics of simple and reliable preparation technology, controllable process, stable product quality and high reproducibility. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] Embodiment 1:

[0018] (1) Preparation of coating: 18.0 g of water-soluble acrylic resin was weighed and dissolved in 40.0 g of butanone solution. After complete dissolution, 2.4 g of silicon dioxide was added under low-speed stirring. After uniform stirring for 30 min, 1.0 g of water-based blue slurry was added. After uniform stirring for 30 min until complete dissolution, 1.0 g of wetting and dispersing agent, 3.0 g of defoaming agent, 1.0 g of leveling agent, and 1.5 g of substrate wetting agent were added. After mixing evenly, the mixture was canned to obtain a water-washable temporary protective coating.

[0019] (2) Performance test: The 2024-T3 aluminum alloy and 2060-T8E30 aluminum-lithium alloy test panels that require a washable temporary protective coating were coated with the coating, dried, and then the performance test was performed; the test performance results are shown in Table 1 below

[0020] Table 1 Performance test results of Example 1

[0021] .

[0023] Embodiment 2:

[0024] (1) Preparation of coating: 20.0 g of water-soluble acrylic resin was weighed and dissolved in 45.0 g of butanone solution. After complete dissolution, 2.8 g of silicon dioxide was added under low-speed stirring. After uniform stirring for 30 min, 1.2 g of water-based blue slurry was added. After uniform stirring for 30 min until complete dissolution, 1.3 g of wetting and dispersing agent, 3.5 g of defoaming agent, 1.2 g of leveling agent, and 1.7 g of substrate wetting agent were added. After mixing evenly, the mixture was canned to obtain a water-washable temporary protective coating.

[0025] (2) Performance test: Performance tests were conducted on aluminum alloy plates coated with CMS-CT-20 epoxy primer and CMS-CT-101 polyurethane topcoat. The test performance results are shown in Table 2 below.

[0026] Table 2 Performance test results of Example 2

[0027]

[0028]

[0029] It can be seen from the test data in Tables 1 and 2 that the washable temporary protective coating of the present invention is applied on various substrates such as metal plates and epoxy paints, and the surface state of each aluminum plate and the glossiness of the epoxy paint are observed and recorded before coating. It has high density, high dry tape adhesion, impact resistance, and wear resistance. After the washable temporary protective coating is applied by brushing and washed with water at different time periods, no residue is found, and it can be quickly washed with water. The surface state of the aluminum plate, the surface state of the epoxy paint, and the glossiness are not changed, and the state protection is complete.

[0030] The present disclosure has been described by the above-mentioned relevant embodiments, but the above-mentioned embodiments are only examples for implementing the present disclosure. It must be pointed out that the disclosed embodiments do not limit the scope of the present disclosure. On the contrary, changes and modifications made without departing from the spirit and scope of the present disclosure are all within the scope of patent protection of the present disclosure.

Claims

1. A water-washable temporary protective coating, characterized in that: Calculated by mass percentage, it is composed of the following components: The resin described is a water-soluble acrylic resin.

2. The water-washable temporary protective coating according to claim 1, characterized in that: The water-soluble acrylic resin is anionic.

3. The water-washable temporary protective coating according to claim 1, characterized in that: The pigment is phthalocyanine blue solution.

4. The water-washable temporary protective coating according to claim 1, characterized in that: The filler is one or more of silicon dioxide and talcum powder.

5. The water-washable temporary protective coating according to claim 1, characterized in that: The solvent is butanone.

6. The water-washable temporary protective coating according to claim 1, characterized in that: The auxiliary agents include wetting and dispersing agents, defoaming agents, leveling agents, and substrate wetting agents.

7. A method for preparing the water-washable temporary protective coating according to any one of claims 1 to 6, characterized in that: The method comprises the following steps: preparing materials according to a formula, dissolving the resin with a solvent, adding pigments and fillers after the resin is completely dissolved, adding various additives in sequence under stirring, stirring the mixture evenly with a high-speed stirrer, filtering and packaging the mixture as a finished product, and obtaining a washable temporary protective coating.

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