CN105802530B - Manufacturing process of hot-melt textured adhesive tape - Google Patents
Manufacturing process of hot-melt textured adhesive tape Download PDFInfo
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Abstract
The invention relates to a manufacturing process of a hot-melt masking tape, wherein sodium bicarbonate water is used as a medium, the space humidity is controlled by a humidity controller, a film containing the sodium bicarbonate water is formed on a masking surface of masking paper, glue is uniformly coated on the surface of the masking paper containing the sodium bicarbonate water film, the sodium bicarbonate water is heated and decomposed into water and carbon dioxide by a heating device, the glue layer is expanded at high temperature, the carbon dioxide and steam are evaporated by penetrating through the glue layer, and thus a porous glue layer similar to foaming is obtained. The invention improves the thickness and initial adhesion of the hot melt adhesive, reduces the production cost and does not cause environmental pollution.
Description
Technical Field
The invention relates to a manufacturing process of a hot-melt masking tape, in particular to a manufacturing process of a hot-melt masking tape, which utilizes a product obtained by thermal decomposition of sodium bicarbonate water to enable a glue layer to form a foaming-like structure.
Background
The beautiful pattern paper is a high-tech paper for decoration and spraying (also called as color separation paper due to the special performance of the purpose), and is widely applied to indoor decoration, spray painting of household appliances and spraying of high-grade luxury cars. The masking tape is a roll-shaped adhesive tape prepared by using masking paper and pressure-sensitive adhesive as main raw materials, coating the pressure-sensitive adhesive on the masking paper and coating an anti-sticking material on the other side. The method is mainly used for industries such as coating shielding of decoration, paint spraying, paint baking and the like, semiconductor element fixing and the like. The masking tape is required to have characteristics of high temperature resistance, good chemical solvent resistance, high adhesion force and the like due to the particularity of the use occasion.
The hot-melt masking tape is prepared by coating hot melt adhesive on one surface of masking paper serving as a substrate. In the existing manufacturing process, the processing can be carried out in two ways, namely, firstly, the hot melt adhesive is required to be foamed, and then the hot melt adhesive is coated on the textured paper. In the foaming process, a solvent needs to be added into the glue, which causes environmental pollution. The hot melt adhesive obtained by the foaming process has high density, and the volume of the hot melt solvent film is far smaller than that of the hot melt adhesive film for the solvent adhesive and the hot melt adhesive with the same dosage. In addition, because the relative price and cost of the hot melt adhesive are relatively high, the cost of the hot melt masking tape produced under the existing process condition is relatively high. Secondly, the humidity controller is utilized to control the masking paper to have a certain water content, then the hot melt adhesive is coated, the adhesive tape after the coating is finished is heated, the water is evaporated, the adhesive layer forms a foaming structure, although the cost is saved, the thickness of the adhesive tape is not thick enough, and the adhesiveness of the adhesive tape is not strong enough.
In view of the above drawbacks, it is necessary to invent a new manufacturing process to solve the deficiencies of the prior art.
Disclosure of Invention
The invention aims to provide a manufacturing process of a hot-melt textured adhesive tape, which aims to solve the problems that the thickness of the hot-melt textured adhesive tape subjected to physical treatment is not thick enough, the adhesiveness of the adhesive tape is not strong enough, and environmental pollution is easily caused in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a manufacturing process of a hot-melt textured adhesive tape comprises the following steps:
a. the method comprises the following steps of (1) adopting the impregnated and release-treated textured paper as a substrate, and controlling the water content in the textured paper to be 1% -9% by adjusting the space humidity;
b. spraying sodium bicarbonate water on the surface of the crepe paper to be coated, and forming a layer of sodium bicarbonate water vapor film on the surface of the crepe paper to be coated by a humidity controller;
c. controlling the temperature to be 100-220 ℃, coating the hot melt adhesive on the surface to be coated of the masking paper containing the baking soda water vapor film in an extrusion mode, and controlling the water content in the masking paper to be kept unchanged by adjusting the space humidity;
d. heating the glued figure paper substrate, and utilizing the principle that the sodium bicarbonate can be decomposed easily by the preheating capacity to preheat the sodium bicarbonate water between the glue layer and the figure paper to decompose H2O and CO2And evaporating the water in the masking tape and the masking tape together to form a foaming structure on the glue layer, thus obtaining the hot-melt masking tape.
Preferably, the concentration of the sodium bicarbonate in the step b is 0.1-1%.
Preferably, the heating in step d includes blowing strong wind or using a heated roller.
Preferably, the heating temperature in the step d is controlled to be 100-250 ℃, and the heating duration is 5-180 s.
Preferably, the amount of the small soda water in the step b is 0.8-1.6 g/m 2.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a manufacturing process of a hot-melt masking tape, which utilizes the self-rewetting property of masking paper, keeps the masking paper to contain a certain content of moisture by a physical method, then forms a layer of baking soda water vapor film on the surface of the masking paper to be coated, then uniformly coats glue on the surface of the masking paper containing the moisture, and heats and decomposes the baking soda water into water and carbon dioxide in the heating process through a heating device, so that the glue layer expands due to high temperature, and the carbon dioxide and the water vapor pass through the glue layer to evaporate, thus the manufactured hot-melt masking tape not only improves the thickness and the bonding strength of the adhesive layer, reduces the production cost, but also does not cause environmental pollution.
Detailed Description
The main component of the baking soda water is baking soda with chemical name of NaHCO3Which is susceptible to chemical reaction after heating and which decomposes to H2O and CO2。
It is the use of NaHCO in the present invention3Before gluing, under the premise of ensuring a certain water content in the crepe paper, sodium bicarbonate is sprayed on the surface of the crepe paper to be glued in advance to form a layer of sodium bicarbonate water film. After the glue is applied, heating the textured paper, and NaHCO in the process3H decomposed out2O and CO2And the moisture contained in the masking paper can permeate the adhesive layer to be evaporated, in the evaporation process, the gas can make the adhesive layer integrally expand, and a porous foaming structure can be formed inside the adhesive layer, so that the hot-melt masking tape is prepared.
In order to more particularly illustrate the practice of the present invention and the significant advances achieved, further description is provided below in conjunction with specific embodiments and experimental data.
The first implementation mode comprises the following steps:
a. adopting the impregnated and release-treated textured paper as a substrate, and controlling the water content in the textured paper to be 1% by adjusting the space humidity;
b. spraying sodium bicarbonate water on the surface of the crepe paper to be coated, and forming a layer of sodium bicarbonate water vapor film on the surface of the crepe paper to be coated by a humidity controller, wherein the usage amount of the sodium bicarbonate water is 0.8g/m2；
c. Controlling the temperature at 100-220 ℃, coating the hot melt adhesive on the surface to be coated of the textured paper containing the baking soda water vapor film in an extrusion mode, and controlling the water content in the textured paper to be 1% by adjusting the space humidity, wherein the concentration of the baking soda water solution is 1%;
d. heating the glued figure paper substrate for 60s, controlling the temperature within the range of 100-250 ℃, and utilizing the principle that the sodium bicarbonate water between the glue layer and the figure paper is preheated to decompose H by utilizing the principle that the sodium bicarbonate water is easy to decompose2O and CO2And evaporating the water in the masking tape and the masking tape together to form a foaming structure on the glue layer, thereby preparing the hot-melt masking tape.
The second embodiment:
a. adopting the impregnated and release-treated textured paper as a substrate, and controlling the water content in the textured paper to be 3.2% by adjusting the space humidity;
b. spraying sodium bicarbonate water on the surface of the crepe paper to be coated, and forming a layer of sodium bicarbonate water vapor film on the surface of the crepe paper to be coated by a humidity controller, wherein the usage amount of the sodium bicarbonate water is 1.2g/m2；
c. Controlling the temperature at 100-220 ℃, coating the hot melt adhesive on the surface to be coated of the textured paper containing the baking soda water vapor film in an extrusion mode, and controlling the water content in the textured paper to be 3.2% by adjusting the space humidity, wherein the concentration of the baking soda water solution is 0.65%;
d. heating the glued figure paper substrate for 80s, controlling the temperature within the range of 100-250 ℃, and utilizing the principle that the sodium bicarbonate can be decomposed easily by the preheating capacity to preheat the sodium bicarbonate water between the glue layer and the figure paper to decompose H2O and CO2And mixing it with the water in the masking paperAnd evaporating to form a foaming structure on the adhesive layer, thereby preparing the hot-melt textured adhesive tape.
The third embodiment is as follows:
a. adopting the impregnated and release-treated textured paper as a substrate, and controlling the water content in the textured paper to be 7% by adjusting the space humidity;
b. spraying sodium bicarbonate water on the surface of the crepe paper to be coated, and forming a layer of sodium bicarbonate water vapor film on the surface of the crepe paper to be coated by a humidity controller, wherein the usage amount of the sodium bicarbonate water is 1.2g/m2；
c. Controlling the temperature at 100-220 ℃, coating the hot melt adhesive on the surface to be coated of the textured paper containing the baking soda water vapor film in an extrusion mode, and controlling the water content in the textured paper to be 7% by adjusting the space humidity, wherein the concentration of the baking soda water solution is 0.25%;
d. heating the glued figure paper substrate for 120s, controlling the temperature within the range of 100-250 ℃, and utilizing the principle that the sodium bicarbonate can be decomposed easily by the preheating capacity to preheat the sodium bicarbonate water between the glue layer and the figure paper to decompose H2O and CO2And evaporating the water in the masking tape and the masking tape together to form a foaming structure on the glue layer, thereby preparing the hot-melt masking tape.
The fourth embodiment:
a. adopting the impregnated and release-treated textured paper as a substrate, and controlling the water content in the textured paper to be 9% by adjusting the space humidity;
b. spraying sodium bicarbonate water on the surface of the crepe paper to be coated, and forming a layer of sodium bicarbonate water vapor film on the surface of the crepe paper to be coated by a humidity controller, wherein the usage amount of the sodium bicarbonate water is 1.6g/m2；
c. Controlling the temperature at 100-220 ℃, coating the hot melt adhesive on the surface to be coated of the textured paper containing the baking soda water vapor film in an extrusion mode, and controlling the water content in the textured paper to be 9% by adjusting the space humidity, wherein the concentration of the baking soda water solution is 0.1%;
d. heating the glued figure paper substrate for 180s, and controlling the temperature within the range of 100-250 DEG CIn the method, the sodium bicarbonate water between the glue layer and the figure paper is preheated to decompose H by utilizing the principle that the sodium bicarbonate is easy to decompose by virtue of the preheating capacity2O and CO2And evaporating the water in the masking tape and the masking tape together to form a foaming structure on the glue layer, thereby preparing the hot-melt masking tape.
In the above embodiment, the adhesive layer is subjected to a similar foaming process, but the similar foaming process does not add any foaming agent, but uses baking soda water with a solution concentration of 0.1% -1% as a medium, controls the water content of the textured paper within a certain range of 1% -9% through a humidity controller, then coats the hot melt adhesive on the textured paper in an extrusion manner within a certain temperature range, heats the glued adhesive tape by blowing strong hot air or a heating roller, expands the adhesive layer at a high temperature, enables the baking soda to be heated and decomposed into water vapor and carbon dioxide, enables the water in the textured paper to be evaporated into water vapor, enables the water vapor and the carbon dioxide to pass through the adhesive layer to be evaporated together with the water contained in the textured paper through the adhesive layer, and enables the adhesive layer to expand in the evaporation process, thereby obtaining a porous adhesive layer similar to foaming, . The invention saves foaming agent and foaming equipment by the technical means, reduces production cost and environmental pollution, increases the relay contact area of the adhesive layer and the substrate and improves the adhesive performance of the adhesive tape.
In addition, the substrate is the beautiful line paper which is subjected to impregnation and release treatment, the release surface of the beautiful line paper can block part of water vapor, so that the water vapor can only run off and evaporate from the side with the glue layer, and the impregnation can prevent the release agent from penetrating into the gluing surface. Therefore, the adhesive layer of the foaming structure formed in the heating process of the adhesive tape after gluing has better performance, water, carbon dioxide and water vapor generated by heating and decomposing baking soda diffuse through the air and run off through the adhesive layer, so that the adhesive layer forms the foaming structure, and the hot melt adhesive flows at high temperature, so that the adhesive is tightly jointed with the substrate.
The following experiments show the remarkable effects of the present invention.
In the experiment, national GB/T4852-84 is adopted to measure the initial adhesion of the hot-melt textured adhesive tape. The method comprises the following steps:
1. principle of experiment
A steel ball is rolled across the adhesive surface of the tape lying flat on the inclined plate. The initial viscosity of the steel ball was evaluated based on the maximum size of the steel ball to which a predetermined length of the adhesive surface could be adhered.
2. Test equipment
2.1 inclined plane bowling device
The device mainly comprises an inclined plate, a ball placing device, a support, a base, a ball receiving box and the like.
2.1.1 inclined plate: the inclined plate was formed by coating a glass plate having a thickness of about 2mm on a steel plate having a thickness of about 7 mm. Millimeter coordinate paper can be inserted between the two plates and used as a mark for placing a sample and adjusting the initial position of the steel ball.
2.1.2 ball player: the ball placing device can adjust the initial position of the steel ball on the inclined plate, and when the steel ball is released, no additional force is applied to the ball.
2.1.3 Stent: the support is used for supporting the inclined plate and adjusting the inclination angle of the plate within the range of 0-60 degrees.
2.1.4 base: the base should be able to adjust and maintain the level of the device.
2.1.5 ball receiving box: the ball receiving box is used for receiving steel balls rolled off the plate, and the inner wall of the ball receiving box is lined with soft materials.
2.2 Steel ball
33 steel balls which are made of GCrl5 bearing steel, have the precision not lower than 0 grade specified in GB 308-77 Steel ball and the diameter of 32-1 inches can be used as steel balls for testing. The steel balls are arranged according to the value 32 times of the British diameter. A set of steel balls with consecutive ball numbers should be used for the test. The steel balls should be stored in rust preventive oil. The steel ball with rust and flaw needs to be replaced in time.
2.3 polyester film
A film having a thickness of 0.025mm as defined in JB 1256-77 "6020 polyester film" was used. It was about 110mm in length and about 20mm wider than the specimen.
2.4 cleaning Agents and wiping materials
2.4.1 cleaning agent, wherein the cleaning agent can adopt appropriate solvents such as chemically pure acetone, ethyl acetate, alcohol and the like.
2.4.2 wiping materials: soft fiber fabric such as absorbent gauze is used as wiping material. Such materials should not contain substances soluble in the solvents mentioned above.
3. Test conditions
3.1 the laboratory temperature is 23. + -. 2 ℃ and the relative humidity is 65. + -. 5%.
3.2 before preparing the test piece, the adhesive tape should be left for more than 2 hours under 3.1 conditions without overlapping with each other, except that the packaging material is removed.
4. Test specimen
The width of the sample is 10-80mm, the length is about 250mm, after removing the outermost 3-5 circles of adhesive tape, unwinding the roll-type adhesive tape at a speed of about 300mm/min, removing the isolating layer of the sheet-like product at the same speed, cutting one sample every 200mm, and taking more than 4 samples. When the tensile deformation of the sample is large, the standing time of not more than 3min is allowed to recover. The sample is taken without allowing hands or other objects to contact the test section of the sample.
5. Test procedure
5.1 preparation work
5.1.1 the inclined plane rolling ball device is adjusted to a horizontal position, and the inclination angle of the inclined plate is adjusted to 30 degrees except for special regulations.
5.1.2 using absorbent gauze dipped with the cleaning agent to scrub the glass surface and two sides of the polyester film, and then wiping the glass surface and the two sides of the polyester film by using the gauze.
5.1.3 putting the steel ball wiped with the anti-rust oil into a container filled with a cleaning agent for soaking for a plurality of minutes, taking out the steel ball, repeatedly cleaning and wiping the steel ball with the clean cleaning agent and gauze, then wiping the steel ball with the clean gauze, and clamping the steel ball with clean tools such as bamboo, wood and bone tweezers.
5.1.4 place the tape sample on the bevel plate with the adhesive side up. The specified position is covered with polyester film as a rolling-aid section. The rolling-assisting section is smooth and has no defects of bubbles, wrinkles and the like. The range of 100mm below the rolling-assistant section is a test section.
5.1.5 fixing the two sides of the rolling-assistant section and the lower end of the sample on the inclined plate by using adhesive tapes. If necessary, adhesive tapes may be used to secure the test sections along the edges of the two sides of the test section so that the test specimens are applied flat to the panel.
5.1.6 clamping the steel ball into the ball placing device by using tweezers, adjusting the front and back positions of the ball placing device to enable the center of the steel ball to be positioned on the initial line of the rolling assisting section, and before formal testing, allowing a sample to be tested for multiple times, but adjusting the left and right positions of the ball placing device to enable the rolling tracks of the steel ball to be misaligned. When the width of the test specimen is larger than 25mm, the area with the width of 25mm in the center of the test specimen is used as an effective test area.
5.2 preselecting maximum steel ball
5.2.1 lightly opening the ball releasing device, and observing whether the rolled steel ball is stuck in the test section (the movement is stopped for more than 5 s). And (4) from large to small, taking steel balls with different ball numbers for proper test until the largest ball number steel ball which can be stuck in the test section is found.
5.2.2 taking the steel ball with the maximum ball number and two balls with the same size and the same ball number connected with the steel ball with the maximum ball number, and respectively carrying out one-time test on the same sample to confirm the steel ball with the maximum ball number.
5.3 official test
Taking 3 samples, and carrying out rolling ball test by using the largest ball steel ball. If a certain sample can not stick to the steel ball, the steel ball with the ball number smaller than that of the sample can be used for testing once, and if the sample can not stick to the steel ball, the steel ball needs to be tested again according to the standard of 5.1.4-5.3.
6. Test results
6.1 the test results are indicated by the steel ball number.
6.2 in the steel balls stuck by the 3 samples respectively, if 3 are the maximum ball number steel balls or two are the maximum ball number steel balls and the ball number of the other is only smaller than the maximum ball number, the test result is expressed by the maximum ball number; if one is the maximum ball number steel ball and the other two are only smaller than the maximum ball number, the test result is expressed as a steel ball number smaller than the maximum ball number.
The initial adhesion of the hot melt textured tape prepared in the present invention and the sample tape prepared by using the foaming agent and the foaming device in the prior art were tested by the above methods, and the test results are shown in table 1:
TABLE 1 initial adhesion test results
In addition, the thickness test of the hot melt textured tape prepared by the present invention and the sample tape prepared by the foaming agent and the foaming device in the prior art was also performed, and the test results are shown in table 2.
Table 2 thickness test results
As can be seen from the data in tables 1 and 2, the average value of 10 tests of the initial adhesion of the hot-melt textured tape prepared by the invention is obviously improved compared with the prior art, and the thickness of the prepared hot-melt textured paper tape is also obviously improved, so that the initial adhesion of the hot-melt textured tape prepared by the invention is improved, the thickness is also increased, and the production cost is obviously reduced.
It should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art will be able to make the description as a whole, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art. The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (5)
1. A manufacturing process of a hot-melt textured adhesive tape is characterized by comprising the following steps: the method specifically comprises the following steps:
a. the method comprises the following steps of (1) adopting the impregnated and release-treated textured paper as a substrate, and controlling the water content in the textured paper to be 1% -9% by adjusting the space humidity;
b. spraying sodium bicarbonate water on the surface of the crepe paper to be coated, and forming a layer of sodium bicarbonate water vapor film on the surface of the crepe paper to be coated by a humidity controller;
c. controlling the temperature to be 100-220 ℃, coating the hot melt adhesive on the surface to be coated of the masking paper containing the baking soda water vapor film in an extrusion mode, and controlling the water content in the masking paper to be kept unchanged by adjusting the space humidity;
d. heating the glued figure paper substrate, and utilizing the principle that the sodium bicarbonate can be decomposed easily by the preheating capacity to preheat the sodium bicarbonate water between the glue layer and the figure paper to decompose H2O and CO2And evaporating the water in the masking tape and the masking tape together to form a foaming structure on the glue layer, thus obtaining the hot-melt masking tape.
2. The manufacturing process of the hot-melt textured tape according to claim 1, characterized in that: the concentration of the small soda water in the step b is 0.1-1%.
3. The manufacturing process of the hot-melt textured tape according to claim 1, characterized in that: the heating in step d includes blowing strong wind or heating with a heating roller.
4. The manufacturing process of the hot-melt textured tape according to claim 1, characterized in that: and d, controlling the heating temperature in the step d to be 100-250 ℃, and controlling the heating duration to be 5-180 s.
5. The manufacturing process of the hot-melt textured tape according to claim 1, characterized in that: the amount of the small soda water in the step b is 0.8-1.6 g/m2。
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| CN201510029078.0A CN105802530B (en) | 2015-01-20 | 2015-01-20 | Manufacturing process of hot-melt textured adhesive tape |
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| CN201510029078.0A CN105802530B (en) | 2015-01-20 | 2015-01-20 | Manufacturing process of hot-melt textured adhesive tape |
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| CN103666311A (en) * | 2012-09-26 | 2014-03-26 | 上海晶华粘胶制品发展有限公司 | Hot melt masking tape and production process thereof |
| CN103173158A (en) * | 2013-04-18 | 2013-06-26 | 上海晶华粘胶制品发展有限公司 | Manufacturing process of hot-melting textured adhesive tape |
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