Method for preventing water-based metallic paint from swelling in barrel at high temperature and application of method

Abstract

The invention discloses a method for preventing high-temperature barrel expansion of water-based metallic paint and application of the method. The method comprises the following steps: adding 20% delustering slurry which accounts for 0.5% by mass into the water-based metallic paint which is prone to high-temperature barrel expansion; the water-based metallic paint easy to swell at high temperature is a formula in which the color paste accounts for more than 8% by mass and the aluminum powder accounts for 1-7% by mass. The 20% delustering slurry comprises the following components in percentage by mass: 20% of delustering powder and 80% of water; the matting powder and the water are mixed according to the proportion and dispersed at a high speed to prepare 20% matting slurry; the high temperature is greater than or equal to 35 DEG C. According to the invention, 20% matting slurry accounting for 0.5% by mass is added into the water-based metallic paint with high temperature (the temperature is greater than or equal to 35 DEG C) and high color paste content (greater than 8%), so that the paint liquid can be protected from swelling in a barrel, and meanwhile, the requirement on the color of the metallic paint is not influenced. According to the method, the working efficiency is improved, the time efficiency is saved, and customer complaints are greatly reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of coatings, and particularly relates to a method for preventing high-temperature barrel expansion of water-based metallic paint and application thereof. BACKGROUND

[0002] In the field of building exterior wall decoration, water-based metallic paint has a wide application space. The water-based metallic paint has strong weather resistance and good decorative effect, and can bring a beautiful and durable decorative effect to the building exterior wall. In addition, the environmental protection characteristics of the water-based metallic paint also help to reduce the energy consumption of the building exterior wall.

[0003] In the water-based metallic paint industry, as people's requirements improve, the product color is becoming richer and richer, and a single metallic color cannot meet people's demand for color. The emergence of a large number of bright and bright colors enriches the color system, which also means that the color paste content increases. When the temperature is high (≥ 35℃), the water-based metallic paint with high color paste content in the logistics and construction site will have a barrel expansion phenomenon, the barrel surface will expand, and even the paint will overflow, which will bring trouble to the construction, and also will cause complaints and losses to the product company. SUMMARY

[0004] The purpose of the present application is to overcome the problem that the existing water-based metallic paint is prone to barrel expansion at high temperature, and a method for preventing high-temperature barrel expansion of water-based metallic paint and application thereof are proposed. By adding 0.5% mass percentage of 20% matting paste to the water-based metallic paint with high temperature (temperature ≥ 35℃) and high color paste content (> 8%), the paint can be protected from barrel expansion, and the color requirements of the metallic paint are not affected. The present application not only improves the work efficiency and saves time, but also greatly reduces the occurrence of complaints.

[0005] To solve the above problems, the present application realizes the following technical scheme:

[0006] The first invention purpose of the present application is:

[0007] A method for preventing high-temperature barrel expansion of water-based metallic paint is provided, which adds 0.5% mass percentage of 20% matting paste to the water-based metallic paint prone to high-temperature barrel expansion;

[0008] The water-based metallic paint prone to high-temperature barrel expansion has a color paste content higher than 8% mass percentage and an aluminum powder content of 1-7% mass percentage;

[0009] The 20% matting paste comprises the following mass percentage components:

[0010] 20% matting powder and 80% water;

[0011] Mix the matting powder and water in proportion and disperse at high speed to make 20% matting paste;

[0012] The high temperature is a temperature greater than or equal to 35 DEG C.

[0013] The matt powder is directly added in the water-based metallic paint, and dispersion is not easy, fineness cannot be reduced, and small particles are easy to be generated in the paint film, which can affect the appearance of the paint film.

[0014] The solubility of the matt powder in water is low, and the solubility limit is usually 20%, and a higher content can not be dissolved to cause agglomeration, and therefore, the 20% matt paste is preferably used.

[0015] The method for preventing the water-based metallic paint from expanding in a can at high temperature is further optimized as follows:

[0016] The matt powder is SYLOID ED-80 matt powder of Grace.

[0017] The method for preventing the water-based metallic paint from expanding in a can at high temperature is further optimized as follows:

[0018] The aluminum powder is a coated aluminum powder used in water-based paint, and the 48H hydrogen evolution amount is less than 1ml.

[0019] The method for preventing the water-based metallic paint from expanding in a can at high temperature is further optimized as follows:

[0020] The color paste is a water-based color paste commonly used in latex paint.

[0021] The method for preventing the water-based metallic paint from expanding in a can at high temperature is further optimized as follows:

[0022] The rapid evaluation method of the water-based metallic paint prone to expand in a can at high temperature comprises the following preparation steps:

[0023] The water-based metallic paint prone to expand in a can at high temperature with a color paste ratio higher than 8% by mass percentage and an aluminum powder ratio greater than 1% by mass percentage in the formula is filled into a 500ml transparent small can, and the filling amount is 2 / 3 of the small can, a marker pen or a masking paper is used to record the initial height of the paint liquid in the transparent small can, and the transparent small can is placed in a 50 DEG C ± 2 DEG C oven, and after 24 hours, the height after heat storage is measured; the initial height marked before heat storage is considered to expand in a can after heat storage, and vice versa.

[0024] The second invention purpose of the application is:

[0025] The water-based metallic paint capable of preventing expansion in a can at high temperature is added with 0.5% by mass percentage of 20% matt paste in the water-based metallic paint prone to expand in a can at high temperature according to the method for preventing the water-based metallic paint from expanding in a can at high temperature.

[0026] The method for preventing the water-based metal paint from high-temperature swelling barrel of the present application first needs to find the key factors affecting the swelling barrel of the water-based metal paint. Through the experimental test of the present application, the aluminum powder used in the water-based metal paint has a coating film itself, which will not decompose and release gas in the water-based system, but after adding the color paste, with the increase of the content of the color paste, when reaching a certain concentration, such as high content of color paste (>8%), under high temperature condition (temperature ≥ 35℃), when the color paste reaches a certain concentration, the polar additive in the color paste will damage the coated aluminum powder, the coating film of the aluminum powder is damaged, the aluminum reacts with water to release hydrogen gas, resulting in the swelling barrel phenomenon. At present, there is no aluminum powder with perfect coating film in the high-temperature and high-concentration color paste system on the market, which needs the coating aluminum powder manufacturers to spend more manpower, material resources to research and improve the related technology, and the price will also increase. However, the present application takes a different approach, which protects the damaged coating film and reduces the possibility of gas generation by aluminum powder reaction. Compared with a large number of researches on the aluminum powder coating film problem, after adding a small amount of mat paste, due to the small density, inertness and large specific surface area of the mat powder, it has strong adsorption, can coat the surface of the aluminum powder, repair the damaged coating film, so that the aluminum powder no longer reacts to generate gas, thereby quickly and conveniently solving the swelling barrel problem. In addition, since the mat paste is transparent and the amount added is very small, it does not affect the color of the product, and at the same time has the advantages of improving the product quality and improving the construction efficiency; it can also reduce the risk of customer complaints for enterprises, improve the brand effect of enterprises, and can bring more convenience to production, and has a wide application value. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the present application more clear and explicit, the present application is described in detail below combined with specific examples. It should be understood that the specific examples described herein are only used to explain the present application, and are not limited to the present application. Any simple improvement to the preparation method of the present application under the concept of the present application is within the protection scope of the present application.

[0028] Example 1

[0029] 14 samples were prepared by using 0.5L plastic cans, 1100g water-based metallic paint, color paste content from 8% to 14%, the rest of the components were added according to the formula, a total of 14 paint samples; the paint samples with different color paste contents were added with 1% to 7% aluminum powder, accurate to the first decimal place, and the added samples were dispersed by Tianjin Sunrida QSJ disperser, three-blade paddle diameter 50mm, speed 600rpm, dispersed for 15 minutes to complete, filled into 14 cans, 500.0g paint sample in each can, accurate to the first decimal place; 7 of them were blank samples without adding mat paste, 7 added 0.5% of 20% mat paste (mat paste formula for water-based system, mat powder content 20%), accurate to the first decimal place; after adding mat paste, the Tianjin Sunrida QSJ disperser was used, three-blade paddle diameter 50mm, speed 600rpm, dispersed for 15 minutes to complete, poured into 500ml transparent plastic cans, attention was paid to pouring on the horizontal surface, the can wall should not be touched by the paint, poured to 2 / 3, and then sealed, the paint height was recorded using a marker pen or masking paper, attention was paid to keep the paint level during the whole process without tilting, placed in a 50℃±2℃ oven for 24H, then taken out and measured the height after hot storage.

[0030] The height marked before hot storage increased after hot storage, which was considered as rising barrel, otherwise, it was considered as not rising barrel. The measurement results of 14 different color paste content water-based metallic paints are shown in Table 1.

[0031] Table 1 Measurement results of water-based metallic paint with different color paste content (mass percentage: %)

[0032]

[0033] From Table 1, when the color paste content is more than 8%, the aluminum powder added amount is from 1% to 7%, and the barrel will rise during high temperature storage, and after adding 0.5% of 20% mat paste, the barrel will not rise during high temperature storage.

[0034] Next, the dosage range of mat paste was optimized and screened.

[0035] A sample paint BASE of 14% color paste and 7% aluminum powder content, 5600g in total (the remaining components are added according to the formula), is prepared. The sample paint BASE is filled into 10 0.5L plastic cans, 500.0g in each, accurate to the first decimal place. 0.1% to 1.0% of 20% matting paste (matting paste formula: water-based system, matting powder content 20%) is added to each, accurate to the first decimal place. The prepared sample paint is dispersed by a Tianjin Sunruida QSJ disperser with a three-blade paddle of 50mm in diameter at a speed of 600rpm for 15 minutes, and then poured into 500ml transparent plastic cans. Note that the pouring is done on a horizontal surface, and the paint liquid should not touch the can wall. Pour to 2 / 3 of the can, and then seal the can. Use a marker or masking tape to record the height of the paint liquid. Note that the whole process should be kept on a horizontal surface. After 24 hours in a 50℃±2℃ oven, the height of the paint liquid after heat storage is measured.

[0036] The height of the paint liquid before heat storage is marked. If the height of the paint liquid after heat storage increases, it is considered to be a rising can. Otherwise, it is considered to be a non-rising can.

[0037] Table 2: Measurement results of water-based metallic paint with different matting paste contents (mass percentage: %)

[0038]

[0039] As shown in Table 2, after the 20% matting paste with a mass percentage of 0.5% to 1.0% is added to the rising can metallic paint, the heat storage no longer rises. Preferably, the 20% matting paste with a mass percentage of 0.5% is added.

[0040] In the rising can test of water-based metallic paint, the rising can is closely related to the temperature. The product may not rise when it is delivered, but it may rise after being placed on site for 2 to 3 days. This is directly related to the ambient temperature. The method of the present application is further described below in combination with specific comparative examples.

[0041] Comparative Example 1

[0042] A sample of the water-based metal paint (color paste 14%, aluminum powder content 7%) was prepared, and BASE paint sample was filled into 8 0.5L plastic tanks, 500.0 grams of paint sample in each tank, accurate to the first decimal place; 4 of them were blank samples without adding matting paste, and 4 of them added 0.5% of 20% matting paste (matting paste formula for water-based system, matting powder content 20%), accurate to the first decimal place; the prepared sample paint was dispersed by a Tianjin Sunruida QSJ disperser with a three-blade paddle of 50mm in diameter at a speed of 600rpm for 15 minutes, poured into a 500ml transparent plastic tank, and poured into the tank to 2 / 3 of the height, and the tank wall was not in contact with the paint, and the paint height was recorded with a marker or masking tape, and the whole process was kept horizontal to avoid tilting. The blank sample and the sample with matting paste were placed in four constant temperature ovens at 55℃±2℃, 45℃±2℃, 35℃±2℃ and 25℃±2℃, respectively, and the paint height change was recorded after 1 day and 2 days. The measurement results of the water-based metal paint samples at different temperatures are shown in Table 3.

[0043] Table 3 Measurement results of water-based metal paint samples at different temperatures

[0044]

[0045] As can be seen from Table 3, the above-mentioned 8 different temperature and different time storage tank conditions are consistent with the normal construction environment temperature, and when the temperature reaches 35℃, the water-based metal paint with high color paste content (blank sample paint) will have a tank expansion phenomenon. The water-based metal paint with high color paste content (blank sample paint) expands the tank on the second day at 35℃, because 35℃ is not high enough, so the tank expansion time is extended to the second day. According to the analysis of the actual experimental results of the inventor, it is found that the reaction time is proportional to the temperature, and the higher the temperature, the shorter the reaction time. When the temperature is high enough (above 45℃), the tank expands in 24 hours, otherwise the temperature is 35℃ and the tank expands in 48 hours, and the temperature is less than 35℃ and the tank does not expand.

[0046] Comparative Example 2

[0047] Taking 2 examples of high-temperature complaints of water-based metal paint that the company has encountered as an example, the paint samples of the complaints and the paint samples after adding matting paste were compared at different times and temperatures to see if the tank expanded.

[0048] Make different color paste ratio BASE 2100g, respectively, fill the BASE paint sample into 4 0.5L plastic tank, each tank paint sample 500.0 grams, accurate to the first decimal place; 2 of which are blank samples without adding extinction paste, 2 add 0.5% of 20% extinction paste (extinction paste formula is water-based system, extinction powder content 20%), accurate to the first decimal place; The sample paint is made by Tianjin Sunruida QSJ disperser with three-blade paste diameter of 50mm and speed of 600rpm / min for 15 minutes, pour into 500ml transparent plastic tank, pay attention to pour on the horizontal surface, the tank wall should not be stained with paint, pour to 2 / 3, then seal, use a marker or stencil paper to record the paint height, pay attention to keep the paint horizontal during the whole process, pour the blank sample and the sample with extinction paste into the 55℃±2℃ oven respectively, record the paint height change after 1 day and 2 days respectively. The measurement results of the paint sample are shown in Table 4.

[0049] Table 4 Measurement results of the water-based metal paint sample with extinction paste (mass percentage: %)

[0050]

[0051]

[0052] As can be seen from Table 4, the metal paint sample appears to rise in the barrel after high-temperature storage, and no rising phenomenon occurs after adding 0.5% of 20% extinction paste, which shows that adding extinction paste has the effect of preventing rising.

[0053] Compared with the traditional method, the method of the present application has the following advantages:

[0054] When the traditional method encounters high temperature, in order to avoid the phenomenon of rising in the barrel, the paint is not filled into the barrel first, and waits for 2-3 days, and then filled into the barrel after the gas reaction is completed.

[0055] The method of the present application can protect the paint from rising in the barrel by adding 0.5% extinction paste in high color paste content (>8%) at high temperature, while not affecting the color requirements of the metal paint.

[0056] Therefore, the method of the present application not only improves the work efficiency and saves time, but also greatly reduces the occurrence of complaints.

[0057] In summary, the above-mentioned embodiments are merely the preferred examples of the present application, and are not intended to limit the present application in any form; any slight change, modification and evolution of equivalent changes made by those skilled in the art within the scope of the technical solutions of the present application, using the disclosed technical content, are all regarded as equivalent examples of the present application; at the same time, any equivalent change, modification and evolution of the above-mentioned embodiments according to the essential technology of the present application, are still within the protection scope of the technical solutions of the present application.

[0058] The technical features of the above-mentioned embodiments can be combined arbitrarily, and in order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0059] The experimental methods not marked with specific conditions in the present application are usually according to the conventional conditions or according to the conditions suggested by the manufacturers.

[0060] The various optimized technical solutions in the present application can be combined with each other, unless otherwise specified.

[0061] Unless otherwise specified, the percentages and parts are weight percentages and weight parts.

[0062] The experimental methods not marked with specific conditions in the present application are usually according to the conventional conditions or according to the conditions suggested by the manufacturers.

[0063] The various raw materials, reagents, components used in the present application are all the corresponding raw materials commonly used in the art, unless otherwise specified.

[0064] Unless otherwise defined, all professional and scientific terms used in the present application have the same meaning as those familiar to those skilled in the art. In addition, any method and material similar or equivalent to the described content can be applied in the present application.

Claims

1. A method for preventing high-temperature swelling of water-based metal paint, characterized in that: 0.5% of 20% matting paste is added to the water-based metal paint prone to high-temperature swelling; the water-based metal paint prone to high-temperature swelling has a color paste content of more than 8% by mass and an aluminum powder content of 1-7% by mass; the 20% matting paste comprises the following components by mass: matting powder 20%, water 80%; the matting powder and water are mixed in proportion and dispersed at high speed to prepare the 20% matting paste; and the high temperature is ≥ 35℃.

2. The method for preventing high-temperature swelling of water-based metal paint according to claim 1, characterized in that: the matting powder is SYLOID ED-80 matting powder from Grace.

3. The method for preventing high-temperature swelling of water-based metal paint according to claim 1, characterized in that: the aluminum powder is a coated aluminum powder used in water-based paint, and the 48H hydrogen evolution amount is less than 1ml.

4. The method for preventing high-temperature swelling of water-based metal paint according to claim 1, characterized in that: the color paste is a water-based color paste commonly used in latex paint.

5. The method for preventing high-temperature swelling of water-based metal paint according to claim 1, characterized in that: the rapid evaluation method of the water-based metal paint prone to high-temperature swelling comprises the following preparation steps: the water-based metal paint prone to high-temperature swelling with a color paste content of more than 8% by mass and an aluminum powder content of more than 1% by mass is filled into a 500ml transparent small tank to 2 / 3 of the tank, a marker pen or masking paper is used to record the initial height of the paint in the transparent small tank, and the tank is placed in a 50℃±2℃ oven; after 24 hours, the tank is taken out and the height after heat storage is measured; if the initial height marked before heat storage rises after heat storage, it is considered to swell, otherwise, it is considered not to swell. The method for preventing high-temperature swelling of water-based metal paint according to claim 1, wherein 0.5% of 20% matting paste is added to the water-based metal paint prone to high-temperature swelling. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 6. A water-based metallic paint capable of preventing high-temperature canning, characterized by ： ​

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