Water-based masking adhesive as well as preparation method and application thereof

Abstract

The invention discloses a preparation method of a water-based masking adhesive. The formula of the water-based masking adhesive comprises 8-12% of polyvinyl alcohol, 28-38% of polyvinylpyrrolidone and 50-62% of water. Adding a proper amount of polyvinyl alcohol and polyvinylpyrrolidone into a reaction kettle, then adding a proper amount of water, and sealing the reaction kettle; mechanical stirring is conducted, the rotating speed is set to be 150-250 r / min, the temperature is set to be 90-120 DEG C, and continuous stirring is conducted for And stopping stirring, stopping heating, and cooling to room temperature to obtain the water-based masking adhesive. The application of the water-based masking adhesive in substrate coating is printing, and the printing means can be selected from but not limited to different printing processes such as silk-screen printing, transfer printing and the like. The water-based masking adhesive does not need to be baked and cured after being printed on the surface of a film coating substrate, can be quickly dried to form a film at room temperature, can be directly subjected to film coating treatment, and can be used for removing a masking area through ultrasonic washing after film coating is finished, so that a patterned film coating piece can be obtained.

Description

Technical Field

[0001] The invention relates to the field of substrate coating processing, and in particular to a water-based masking adhesive and a preparation method and application thereof. Background Art

[0002] Glass substrates can be deposited with specific thin films on their surfaces by magnetron sputtering technology, thereby giving glass itself properties that it does not have. The resulting coated glass is widely used in glass products in the fields of architecture and automobiles. For the substrate, not the entire surface needs to be coated. Usually, masking means are used to prevent the deposition of thin films on some areas of the substrate, thereby obtaining patterned coated glass. Silk-screen tearable ink film is a commonly used masking process. After the coating is completed, the ink film can be torn off to obtain a patterned coated product. The silk-screen tearable ink masking process is to print ink on the surface of the glass substrate, and obtain a tearable film after high-temperature baking and curing. However, this process has certain defects. During the high-temperature baking and curing process of the ink, there is a risk of oily substances contaminating the glass coating area. If the ink is not thoroughly dried, there is a risk of oily substances contaminating the coating cavity. It is not easy to clean and there is a risk of abnormal coating quality. In addition, this process requires a cleaning process after the ink is baked and cured and after the film is torn off. The process is cumbersome and the process cost is high. In addition, the tearable ink film masking process requires high-temperature baking and is not suitable for masking plastic substrate coated products. Summary of the invention

[0003] In order to solve the above technical problems, the purpose of the present invention is to provide a water-based masking adhesive with high efficiency, low cost, excellent coating quality and wide application range, as well as a preparation method and application thereof.

[0004] In order to achieve the above object, the present invention provides a method for preparing a water-based masking adhesive, the formula of which includes 8-12% polyvinyl alcohol, 28-38% polyvinyl pyrrolidone, and 50-62% water. The method includes the following steps:

[0005] Step 1, putting appropriate amount of polyvinyl alcohol and polyvinyl pyrrolidone into a reaction kettle, then adding appropriate amount of water, and sealing the reaction kettle;

[0006] Step 2: mechanical stirring, with the speed set at 150-250 r / min and the temperature set at 90-120°C, and stirring continued for 2-4 hours;

[0007] Step 3: Stop stirring, turn off heating, and cool to room temperature to obtain the water-based masking glue.

[0008] According to a preferred technical solution, polyvinyl alcohol is selected from one or more combinations having an alcoholysis degree within the range of 70 to 99.9%.

[0009] The application of the water-based masking adhesive in substrate coating is printing, and the printing method can be selected from but not limited to different printing processes such as screen printing and transfer printing.

[0010] The advantages of the present invention are:

[0011] 1. The water-based masking glue of the present invention does not need to be baked and cured after printing on the surface of the coating substrate. It can be quickly dried to form a film at room temperature and directly subjected to coating treatment. After coating, the masking area can be removed by ultrasonic water washing to obtain a patterned coating part. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. The accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0013] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0014] Figure 1 Schematic diagram of the process of this embodiment. DETAILED DESCRIPTION

[0015] The following are specific embodiments of the present invention, and are shown in conjunction with the accompanying drawings ( Figure 1 The technical solution of the present invention is further described in the following figures, but the present invention is not limited to these embodiments.

[0016] The formula of the water-based masking glue includes 8-12% polyvinyl alcohol, 28-38% polyvinyl pyrrolidone, and 50-62% water, and the polyvinyl alcohol is selected from one or more combinations of polyvinyl alcohols with alcoholysis degrees ranging from 70 to 99.9%. Specific embodiment 1: 100.0g polyvinyl alcohol (alcoholysis degree 80%) and 350.0g polyvinyl pyrrolidone are put into a reaction kettle, and then 550.0g water is added, and the reaction kettle is sealed;

[0017] Mechanical stirring, speed setting 150-250r / min, temperature setting 90-120℃, continuous stirring for 2-4 hours;

[0018] Stop stirring, turn off heating, and cool to room temperature to obtain water-based masking glue.

[0019] Specific Example 2: 100.0 g of polyvinyl alcohol (97 g of polyvinyl alcohol with an alcoholysis degree of 80% and 3 g of polyvinyl alcohol with an alcoholysis degree of 99%) and 350.0 g of polyvinyl pyrrolidone were put into a reactor, and then 550.0 g of water was added, and the reactor was sealed;

[0020] Mechanical stirring, speed setting 150-250r / min, temperature setting 90-120℃, continuous stirring for 2-4 hours;

[0021] Stop stirring, turn off heating, and cool to room temperature to obtain water-based masking glue.

[0022] Application method of the water-based masking glue in patterned coating products:

[0023] Taking glass substrate and screen printing as an example, the glass of specific size is cut according to the demand, the cut glass is ground and chamfered, and then put into the washing machine for washing and drying.

[0024] Select 10-700 mesh to make a screen printing stencil with a specific pattern, load the screen printing stencil onto the screen printing machine, and adjust appropriate parameters such as pressure, knife stop position, and screen spacing.

[0025] Load an appropriate amount of water-based masking glue onto the screen, load the washed and dried glass substrate, and start printing.

[0026] After printing is completed, it is naturally dried for 20 seconds to solidify into a film, and a coating substrate covered by a water-based masking adhesive film can be obtained.

[0027] The coated substrate is placed in a magnetron sputtering coating machine for coating treatment.

[0028] After the coating is completed, it is put into an ultrasonic washing machine for cleaning and drying. After the masking film is removed, the patterned coated product can be obtained. According to the needs, the coated product can be further coated.

[0029] Taking plastic film substrate and screen printing as an example, it is cut into specific sizes and put into a washing machine for cleaning and drying. The subsequent steps are the same as those of the glass substrate.

[0030] After the water-based masking glue of this embodiment is printed on the coating substrate, it quickly and naturally solidifies into a film, and the flatness of the edge of the printed pattern is high. After printing, no additional treatment is required, and the coating process can be directly performed, which simplifies the process and reduces the production cost. The water-based masking glue uses water as a solvent, and the polyvinyl alcohol and polyvinyl pyrrolidone used have good biodegradability and overall low environmental pollution. The water-based masking glue is also pollution-free to the coating substrate, which is beneficial to improving the coating quality and film firmness. After the coating is completed, a one-step ultrasonic water washing can be performed to quickly obtain a coating product, thereby improving production efficiency.

Claims

1. A method for preparing a water-based masking adhesive, characterized in that: The formula includes 8-12% polyvinyl alcohol, 28-38% polyvinyl pyrrolidone, and 50-62% water. The method includes the following steps: Step 1, putting appropriate amount of polyvinyl alcohol and polyvinyl pyrrolidone into a reaction kettle, then adding appropriate amount of water, and sealing the reaction kettle; Step 2: mechanical stirring, with the speed set at 150-250 r / min and the temperature set at 90-120°C, and stirring continued for 2-4 hours; Step 3: Stop stirring, turn off heating, and cool to room temperature to obtain the water-based masking glue.

2. The method for preparing a water-based masking adhesive according to claim 1, characterized in that: The polyvinyl alcohol is selected from one or more combinations having an alcoholysis degree within the range of 70 to 99.9%.

3. A water-based masking adhesive obtained by the preparation method of the water-based masking adhesive according to any one of claims 1 to 2.

4. Use of the water-based masking adhesive described in claim 3 in substrate coating.

Images