A modified aspartic polyurea orange peel paint, its preparation method and application method

Abstract

A modified aspartic polyurea orange peel paint, its preparation method, and its application method are disclosed, relating to the field of orange peel paint manufacturing technology. The paint includes component A and component B. Component A comprises 30-60 parts by weight of modified polyaspartic acid ester. Component B comprises 90-95 parts by weight of curing agent. The mass ratio of component A to component B is 100:30-55. The modified polyaspartic acid ester comprises 80 parts by weight of raw material. The curing agent is a curing agent containing isocyanate groups. This application provides a low-VOC oil-based orange peel paint modified from EVA resin, which achieves the orange peel effect through the molecular weight difference between EVA resin and polyaspartic acid ester, exhibiting low pollution, high solids content, and good salt spray resistance.

Description

Technical Field

[0001] This application relates to the field of orange peel paint production technology, and in particular to an orange peel paint prepared by modifying polyaspartic acid ester. Background Technology

[0002] Orange peel paint is a type of paint with a textured surface resembling the unevenness of an orange peel. It features a strong three-dimensional effect and excellent decorative properties, and is used for the protection and decoration of various mechanical equipment, electrical appliances, doors, windows, and other objects with metal casings. It can conceal various rough and uneven imperfections on metal surfaces, achieving an artistic decorative effect. Orange peel paint includes oil-based and water-based paints. Most oil-based paints contain a large amount of volatile organic compounds (VOCs), which can cause serious air pollution during use. Although water-based paints have a lower VOC content, they still have drawbacks such as slow drying speed and blurred texture.

[0003] Polyaspartic acid ester resin is prepared by the Michael reaction of aliphatic or alicyclic diamines or polyamines with maleic acid esters or fumarate esters. Polyaspartic acid esters are commonly used in the coatings industry. Polyaspartic acid ester polyurea coatings, made by reacting polyaspartic acid esters with isocyanates, exhibit slower reaction times due to steric hindrance and inductive effects. This solves the problem of rapid gelation in most polyurea materials, which leads to processing difficulties and the need for large-scale spraying equipment. However, polyaspartic acid esters have a small molecular weight and a high ester bond content, resulting in poor hydrophobicity and water resistance. This leads to poor salt spray resistance in the coatings, primarily because salt spray is a supersaturated water mist. The poor hydrophobicity and water resistance of polyaspartic acid ester polyurea coatings allow salt spray to penetrate the paint film more easily, causing corrosion. Summary of the Invention

[0004] To address the issues of high pollution from oil-based orange peel paint, slow drying speed and blurred texture from water-based orange peel paint, and poor salt spray resistance of polyaspartic acid ester polyurea, this application provides a modified aspartic polyurea orange peel paint, its preparation method, and its application method.

[0005] Firstly, the modified aspartic polyurea orange peel texture paint provided in this application adopts the following technical solution:

[0006] A modified aspartic polyurea orange peel paint comprises component A and component B. Referring to the weight of component A, component A comprises the following raw materials by weight: 30-60 parts modified aspartic ester, 4-9 parts organic solvent A, 0.3-1.5 parts filler, 40-70 parts pigment, 0.4-0.9 parts dispersant, 1-2 parts adhesion promoter, 0.2-0.5 parts leveling agent, 0.2-0.5 parts defoamer, and 0.2-0.5 parts antifoaming agent; component B... Based on the weight of components, component B comprises the following raw materials by weight: 90-95 parts curing agent and 5-10 parts organic solvent B; the mass fraction ratio of component A to component B is 100:30-55; based on the weight of the modified polyaspartic ester, the modified polyaspartic ester comprises the following raw materials by weight: 80 parts polyaspartic ester, 3-8 parts EVA resin, and 12-17 parts butyl ester; the curing agent is a curing agent containing isocyanate groups.

[0007] By adopting the above technical solution, EVA resin has a relatively large molecular weight, with an average molecular weight reaching 30,000-50,000, while polyaspartic acid ester has a smaller molecular weight, mostly only a few hundred. Utilizing this molecular weight difference, EVA resin is used to modify polyaspartic acid ester. The resulting modified polyaspartic acid ester, after reacting with a curing agent, forms a polyurea coating with a distinct and uniform orange-grain structure. Due to its small molecular weight, polyaspartic acid ester has good solubility; only a small amount of solvent is needed to dissolve a large amount of polyaspartic acid ester. Furthermore, polyaspartic acid ester itself is non-volatile. Polyurea coatings synthesized from polyaspartic acid esters have low VOCs, resulting in less air pollution during application. The lower VOCs also allow for faster drying, preventing uneven coating distribution due to gravity or other external forces during drying and thus avoiding unclear orange peel textures. Furthermore, due to the lower volatile content and higher solids content, less raw material is needed for the same solids content, leading to higher material utilization. The higher solids content also makes the orange peel texture more pronounced. EVA resin is chemically stable, possessing excellent aging and corrosion resistance, and EVA... EVA resin also possesses a closed-cell structure, which prevents water molecule penetration, giving it excellent waterproof and moisture-proof properties, thus providing good corrosion resistance. By modifying polyaspartic acid ester with EVA resin, and synthesizing orange peel texture paint from this modified polyaspartic acid ester, the orange peel texture paint exhibits excellent salt spray resistance, aging resistance, and corrosion resistance. The curing agent contains isocyanate groups, which can react with the secondary amines of polyaspartic acid ester to form a polyurea structure, thereby crosslinking multiple polyaspartic acid esters, increasing the molecular weight, and resulting in a structure with better mechanical strength and aging resistance. The adhesion promoter is a novel type... Resin-based adhesion promoters have a special effect on preventing paint peeling. When used in orange peel paint, they can increase the adhesion of the paint and prevent the paint surface from peeling off after construction. Leveling agents can reduce the surface tension of the paint, promoting the formation of a smooth, even film during the drying process. When used in orange peel paint, they are beneficial to the smoothness and uniformity of the orange peel coating. Defoamers and antifoaming agents can reduce the surface tension of the liquid and prevent the formation of bubbles. When used in orange peel paint, they can prevent the formation of bubbles due to mixing during the production process, thus preventing bubbles from being left on the paint surface during the application of the orange peel paint, which helps to make the paint surface smooth and uniform.

[0008] Optionally, the modified polyaspartic ester is prepared by mixing EVA resin and C organic solvent, heating and stirring until the EVA resin melts, then adding polyaspartic ester and stirring evenly to obtain the modified polyaspartic ester.

[0009] By adopting the above technical solution, since polyaspartic acid ester and curing agent will form a solid paint surface within a certain period of time after mixing, the polyaspartic acid ester and EVA resin are mixed before the reaction. This can avoid insufficient mixing time after the reaction, which would prevent the EVA resin and polyaspartic acid ester polyurea from being mixed evenly. It can also allow the polyaspartic acid ester to undergo a cross-linking reaction through the curing agent when it is mixed evenly with EVA resin. This improves the tightness of the connection and the uniformity of the distribution of each component of the orange peel paint, so that the orange peel paint has a more uniform orange peel texture and more stable performance.

[0010] Optionally, the modified polyaspartic ester includes two different polyaspartic esters.

[0011] By adopting the above technical solution, different polyaspartic esters contain different aliphatic or alicyclic diamines or polyamines, resulting in different physical and chemical properties. This leads to different solubilities in different organic solvents and different reaction rates with curing agents. Consequently, in practical applications, this translates to different time intervals between mixing the polyaspartic ester with the curing agent and the completion of drying. By using different types of polyaspartic esters as components of modified polyaspartic esters, the construction time can be controlled by varying the composition, thus facilitating construction.

[0012] Optionally, both organic solvent A and organic solvent B are mixed solutions of butyl acetate and propylene glycol methyl ether acetate, wherein the volume ratio of the two is butyl acetate:propylene glycol methyl ether acetate = 1:0.4-0.5.

[0013] By adopting the above technical solution, propylene glycol methyl ether acetate is an excellent industrial solvent. Its molecule contains ester, carbonyl, and alkyl groups, and has both non-polar and polar parts. It has a certain solubility for both non-polar and polar substances. Moreover, propylene glycol methyl ether acetate has low toxicity and will not affect the health of construction workers during construction. Compared with butyl acetate, propylene glycol methyl ether acetate has a stronger solubility, but a slower evaporation rate, which results in a slower drying speed of the coating during construction and causes problems such as construction difficulties. Therefore, butyl acetate, which has a stronger volatility, is added to accelerate the drying speed of the coating during specific construction. The volume ratio of butyl acetate to propylene glycol methyl ether acetate is 7:3, which is empirical data obtained from long-term construction and experiments. This ensures that the coating components are dissolved evenly and that the drying speed of the coating is within a suitable range.

[0014] Optional fillers include carbon black and silica.

[0015] By adopting the above technical solutions, fillers used in the coatings field can improve the mechanical properties of coating products by tightly bonding with them, and can also increase the solid content of the products. Fillers are usually neutral organic or inorganic substances that do not react with product components. Carbon black and silica are common fillers. Carbon black is mainly composed of elemental carbon, and carbon black particles have a particle size between 10-500 micrometers. In coating processing, carbon black can give coatings stronger mechanical strength, thereby improving the tensile properties, impact resistance, and abrasion resistance of the coatings. In addition, carbon black can darken the color of the coatings, playing a role in adjusting the color. Silica is mainly composed of amorphous silica or silicates, and has the characteristics of high temperature resistance, non-flammability, and insulation. In coating processing, silica can also improve the mechanical strength of the coatings, and can improve the tensile strength and tear resistance of the coatings. In addition, due to its porous and chemically stable characteristics, silica can also improve the adhesion and anti-aging ability of the coatings.

[0016] Optional pigments include titanium dioxide and zinc phosphate.

[0017] By adopting the above technical solutions, titanium dioxide, an important inorganic chemical pigment, is mainly composed of titanium dioxide. Among commonly used white pigments, titanium dioxide has the lowest density and the largest volume for the same mass. Titanium dioxide has stable chemical properties and good thermal stability, so it will not fade due to time or temperature changes and has strong anti-aging ability. In addition, titanium dioxide also has filling ability, which can improve the mechanical strength of coatings. Zinc phosphate is an inorganic compound, a white crystalline powder. Zinc phosphate is often used as an anti-rust pigment, which can improve the anti-rust ability of coatings. In addition, zinc phosphate also has adhesive properties, which can strengthen the mechanical strength of coatings.

[0018] Secondly, the method for preparing the modified aspartic polyurea orange peel paint provided in this application adopts the following technical solution:

[0019] A method for preparing the above-mentioned modified aspartic polyurea orange peel paint includes the following steps:

[0020] Preparation of component A:

[0021] (a) The prepared modified polyaspartic acid ester is mixed with organic solvent A, and a dispersant is added. The mixture is stirred until homogeneous to obtain a mixture.

[0022] (b) Add pigment to the mixture and mix thoroughly, then add filler and mix thoroughly, and grind until there are no particles;

[0023] (c) After grinding, add adhesion promoter, leveling agent, defoamer and antifoamer, mix evenly to form component A, and seal and store.

[0024] Preparation of component B:

[0025] Mix the curing agent with organic solvent B and stir until homogeneous to form component B, then seal and store.

[0026] The preparation of component A and component B were carried out at room temperature and pressure.

[0027] By adopting the above technical solution, the modified polyaspartic acid ester is dissolved in the solvent. Through mixing and stirring, the modified polyaspartic acid ester is fully dissolved in the solvent. Before adding the pigment, a dispersant is added and stirred until uniformly mixed, ensuring the pigment is evenly dispersed in the mixture in step a, which is beneficial for the consistency of the coating's color and performance. EVA resin is a fat-soluble polymer, and butyl ester is a commonly used organic solvent, readily available on the market. Butyl ester can dissolve EVA resin and is miscible with polyaspartic acid ester, which is beneficial for the uniform mixing of EVA resin and polyaspartic acid ester, ensuring successful modification. Therefore, after the subsequent crosslinking reaction of polyaspartic acid ester with the curing agent, the EVA resin and the crosslinked polyaspartic acid ester polyurea can intertwine and distribute evenly, which is beneficial for... The resulting orange peel texture paint is stable and produces a uniform orange peel pattern. Furthermore, due to the rapid volatility of butyl ester, it evaporates quickly during the application stage, without affecting the properties or drying speed of the orange peel texture paint. In the mixture in step c, adding filler, mixing thoroughly, and grinding until free of particles prevents filler agglomeration and ensures a uniform and dense distribution of filler within the coating. Then, adding adhesion promoter, leveling agent, defoamer, and antifoaming agent and mixing thoroughly allows each component to work evenly within the coating. To facilitate rapid reaction with the modified polyaspartic acid ester, the curing agent is first dissolved in a solvent, allowing for faster and more uniform mixing of components A and B. This enables the coating to react completely in a shorter time, avoiding increased application difficulty due to uneven reaction.

[0028] Thirdly, the application method of the orange peel texture paint prepared by the above preparation method provided in this application adopts the following technical solution: The application method of the orange peel texture paint prepared by the above preparation method is as follows: Under normal temperature and pressure, open the sealed A component and B component, mix the two, stir evenly, apply to the construction surface, and dry to form an orange peel texture paint surface.

[0029] By adopting the above technical solution, since both component A and component B contain volatile solvents, if the solvents evaporate, the two components will solidify. In order to facilitate construction and avoid redissolving during construction, the two components need to be sealed and stored to prevent the solvent evaporation mixture from solidifying. When processing is required, the seals are opened and the mixture is stirred evenly. Before the modified polyurea formed by the mixture solidifies, the orange peel paint needs to be applied to the construction surface. After the volatile substances evaporate, an orange peel paint surface is formed covering the construction surface.

[0030] Optionally, orange peel coating is applied to one surface of the metal casing, metal wall, and metal sheet.

[0031] By adopting the above technical solutions, metal has better luster and is easier to process than other materials. Therefore, metal is widely used as the outer shell of various items in production and daily life. However, metal itself is also more susceptible to corrosion in the environment, and may rust, crack, etc. Therefore, compared with protecting other construction surfaces, protecting the metal shell is more important. Orange peel paint can cover the metal surface and prevent salt or acid and alkali gases or liquids from contacting the metal surface, so that the metal can avoid being corroded by the above substances and maintain stability for a longer time. Orange peel paint can also prevent ultraviolet rays from causing dullness and color changes on the metal surface, so that the metal surface can always maintain its original luster and color. In addition, orange peel paint can also form an orange peel structure on the metal surface, which not only beautifies the metal surface, but also increases the friction of the metal surface, which can be helpful in production and daily life in some cases.

[0032] In summary, this application includes at least one of the following beneficial technical effects:

[0033] 1. By modifying polyaspartic acid ester with EVA resin, the modified resin is reacted with a curing agent to obtain a coating with an orange peel texture. The low VOC and high solids content of polyaspartic acid ester result in less pollution during the application of orange peel paint, and the drying time is suitable. The modification of EVA resin gives the orange peel paint better resistance to salt spray and acid and alkali.

[0034] 2. Orange peel paint is prepared by mixing two modified polyaspartic acid esters, thereby controlling the reaction rate of the modified resin and the curing agent, and thus controlling the drying speed of the paint, so that the drying speed of the paint is suitable for specific construction operations. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the orange peel texture paint surface of Embodiment 1 of this application;

[0036] Figure 2 This is a schematic diagram of the orange peel texture paint surface of Embodiment 3 of this application;

[0037] Figure 3 This is a schematic diagram of the orange peel texture paint surface of Embodiment 5 of this application. Detailed Implementation

[0038] The present application will be described in detail below with reference to Examples 1 to 9.

[0039] In Examples 1 to 9, the organic solvent C is butyl acetate, and the polyaspartic acid esters are two types of polyaspartic acid esters produced by Shenzhen Feiyang Junyan New Materials Co., Ltd., with models F520 and F420 respectively. (Web links: https: / / feiyangjyy.cn.china.cn / supply / 4916502788.html; https: / / ylcool.com / sjk / 207660; https: / / feiyangjyy.cn.china.cn / supply / 4912841360.html; https: / / ylcool.com / sjk / 207661)

[0040] The preparation and application methods of the orange peel texture paint in Examples 1 to 9 are as follows:

[0041] When preparing orange peel texture paint, components A and B are prepared separately and sealed for storage. The preparation method of component A includes the following steps.

[0042] 1. Preparation method of modified polyaspartic acid ester:

[0043] (a1) Measure the specified amount of EVA resin, butyl ester and polyaspartic acid ester F520, mix the EVA resin and butyl ester, stir at 70°C until the EVA resin dissolves (or at 60°C or 80°C), then add polyaspartic acid ester F520 and stir evenly to prepare modified polyaspartic acid ester GXET520.

[0044] (a2) Take a specified number of parts of EVA resin, butyl ester and polyaspartic acid ester F420, and prepare modified polyaspartic acid ester GXET420 using the method in step (a1).

[0045] 2. Measure the specified volume of butyl acetate and propylene glycol methyl ether acetate, mix them evenly, and prepare an organic solvent;

[0046] 3. Measure the specified amounts of modified polyaspartic acid ester GXET520, GXET420 and the organic solvent obtained in step (b), and mix them evenly;

[0047] 4. Measure the specified amounts of dispersant BYK163, dispersant EFKA4061, titanium dioxide R-298 and zinc phosphate 106, add them to the mixture in step (c), and mix well;

[0048] 5. Measure the specified amount of carbon black U and silica CR-20, add them to the mixture in step (e), mix them evenly, and grind them until there are no particles;

[0049] 6. Measure the specified amount of adhesion promoter KH-560, leveling agent EFKA3777, defoamer EFKA2020 and defoamer YTA9001, add them to the mixture in step (e), mix them evenly to make component A, and seal and store component A.

[0050] The preparation method of component B is as follows:

[0051] Measure the specified amount of curing agent TPA-100 and the organic solvent obtained in step (b), mix them evenly to form component B, and seal and store component B.

[0052] The method for applying orange peel texture paint is as follows:

[0053] When using, unpack components A and B, measure the specified amounts of components A and B, mix them thoroughly, and then apply the mixture to the surface to be painted. The application process should not be too slow, otherwise the orange peel texture paint will solidify, making the application difficult. Apply the orange peel texture paint to the surface to be painted within a certain time. After drying, an orange peel texture surface will be formed. The surface to be painted can be the surface of various mechanical equipment, electrical appliances, doors and windows, and other objects with metal shells. It not only provides protection but also conceals various rough and uneven defects on the metal surface, achieving an artistic decorative effect.

[0054] In Examples 1 to 9, the acid and alkali resistance, salt spray resistance, weather resistance, and orange peel texture of the orange peel paint all require coating the paint onto a metal plate to create test samples. The performance of the orange peel paint is then judged by testing the various properties of the test samples. The content of each test is as follows:

[0055] For acid and alkali resistance testing, according to the national standard GB / T 30648.1-2014, the test sample is immersed in a 5% sulfuric acid solution or a 5% sodium hydroxide solution for 126 hours. After immersion, observe how long it takes for phenomena such as blistering, cracking, decreased gloss, and rusting of the metal plate to occur. If only the paint surface changes slightly and no other adverse phenomena occur, the acid and alkali resistance of the orange peel paint is considered to be within the qualified range. When phenomena such as blistering, cracking, decreased gloss, and rusting of the metal plate occur, record the time when these phenomena occur and define it as the acid and alkali resistance time. The quality of the acid and alkali resistance of the orange peel paint is judged by the level of the acid and alkali resistance time. Generally speaking, an acid and alkali resistance time exceeding 168 hours is considered qualified.

[0056] Salt spray resistance test, according to national standard GB / T 1771-2007, involves making two scratches on the surface of the test sample, which need to break through the orange peel paint, exposing the metal plate surface to the air. The test sample with scratches is then placed in a salt spray chamber filled with a mist of neutral salt spray, the main component of which is sodium chloride solution. The time after which blistering, powdering, and cracking occur on the non-scratched parts is observed and recorded, and this time is defined as the salt spray resistance time. The salt spray resistance time is used to judge the salt spray resistance of the orange peel paint.

[0057] Weather resistance testing, in accordance with the national standard GB / T 23987-2009, involves irradiating the test sample with ultraviolet light in a UVA aging chamber, observing changes in gloss and color difference, and recording the time it takes for the test sample to lose gloss or experience a significant change in color. This time is defined as the weather resistance time, and the quality of the orange peel paint's weather resistance is judged by the level of the weather resistance time.

[0058] Examples 1-9:

[0059] Modified polyaspartic acid ester was prepared according to the content of each component specified in Table 1, using step (a) of the preparation method for component A; orange peel paint was prepared according to the content of each component specified in Table 2, using steps (b) to (f) of the preparation method for component A and the preparation method for component B, and coated on a metal plate according to the above-described application method to prepare a test sample; the performance of the test samples of each embodiment was tested according to the above-described test, and the test results of the test samples are listed in Table 3.

[0060] In Table 2, the mass fractions of each component in the orange peel paint are as follows: Component B consists of curing agent TPA-100 and organic solvent in a mass ratio of 9:1. Since the organic solvent is only used to dissolve the curing agent and improve the mixing of the curing agent and modified polyaspartic acid ester, it does not affect the performance of the orange peel paint. Therefore, in Examples 1 to 9, the composition of component B was fixed, and its content in the preparation of the orange peel paint was adjusted, thereby adjusting the proportion of curing agent in the orange peel paint to study the effect of the amount of curing agent on the performance of the orange peel paint. In Examples 1-7, due to changes in the mass fraction of modified polyaspartic acid ester, in order to ensure the mixing of modified polyaspartic acid ester and the curing agent... Since the equivalent ratio of the curing agent remains constant, the mass composition of component B needs to be adjusted according to the mass composition of the modified polyaspartic ester to keep the equivalent ratio of the modified polyaspartic ester and the curing agent constant. In Examples 1-7, the equivalent ratio of the amount of secondary amines in the modified polyaspartic ester to the isocyanate groups in the curing agent is 1:1.05. In Example 8, the equivalent ratio is 1:1. In Example 9, the equivalent ratio is 1:1.1. By the difference between the equivalent ratio of the amount of secondary amines in the modified polyaspartic ester and the isocyanate groups in the curing agent, the mass fractions of the modified polyaspartic ester and the curing agent that provide the best orange peel texture paint performance are determined.

[0061] Furthermore, in Table 2, except for the changes in the mass fractions of modified polyaspartic acid ester GXET420, GXET520, and component B, the mass fractions of the other components remained unchanged. This was to better study the impact of the differences in the contents of EVA resin, modified polyaspartic acid ester, and curing agent on the performance of orange peel paint. The contents of each fixed component mentioned above are the best empirical data obtained by those skilled in the art through multiple experiments and production.

[0062] Comparative Example 1

[0063] The orange peel paint prepared in this comparative example differs from that in Example 2 in that cellulose acetate butyrate (CAB) was used instead of EVA resin as the raw material for modifying polyaspartic acid ester, in order to explore the effect of EVA on the performance of the orange peel paint.

[0064] Comparative Example 2

[0065] The orange peel paint prepared in this comparative example differs from that in Example 2 in that ethyl cellulose was used instead of EVA resin as the raw material for modifying polyaspartic acid ester, in order to explore the effect of EVA on the performance of the orange peel paint.

[0066] Table 1. Mass fraction of modified polyaspartic acid ester

[0067]

[0068] Table 2. Weight of Orange Peel Paint (Parts)

[0069]

[0070]

[0071] Table 3 shows the test results of Examples 1 to 9 and Comparative Examples 1 and 2.

[0072]

[0073] By combining the component data of each embodiment in Tables 1 and 2 with the data on alkali resistance, acid resistance, salt spray resistance and weather resistance in Table 3, the influence of different components on the performance of orange peel paint can be analyzed.

[0074] Comparing Examples 1-3, the alkali resistance, acid resistance, salt spray resistance, and weather resistance of Examples 1, 2, and 3 increased sequentially. It can be concluded that in the modified polyaspartic acid ester, within the range of 3%-8% by mass of EVA resin, the higher the EVA resin content, the better the acid and alkali resistance, salt spray resistance, and weather resistance of the orange peel paint.

[0075] Comparing Examples 2, 4, and 5, the alkali resistance, acid resistance, salt spray resistance, and weather resistance of Examples 5, 2, and 4 increased sequentially. It can be concluded that in the modified polyaspartic acid ester, within the range of 20-40 parts by mass of GXET420, the higher the content of GXET420, the better the acid and alkali resistance, salt spray resistance, and weather resistance of the orange peel paint.

[0076] Comparing Examples 2, 6, and 7, the alkali resistance, acid resistance, salt spray resistance, and weather resistance of Examples 6, 2, and 7 increased sequentially. It can be concluded that in the modified polyaspartic acid ester, within the range of 10-20 parts by mass of GXET520, the higher the content of GXET520, the better the acid and alkali resistance, salt spray resistance, and weather resistance of the orange peel paint.

[0077] Comparing Examples 2, 8, and 9, the alkali resistance, acid resistance, salt spray resistance, and weathering time of Examples 2 and 9 are all longer than those of Example 8. This indicates that within the range of 1:1-1.05 equivalent ratio of secondary amines in the modified polyaspartic acid ester to isocyanate groups in the curing agent in the orange peel paint, the higher the content of the curing agent, the better the acid and alkali resistance, salt spray resistance, and weathering resistance of the orange peel paint. Examples 2 and 9 have the same alkali resistance, acid resistance, and weathering time, but Example 2 shows better salt spray resistance. This indicates that the modified polyaspartic acid ester in the orange peel paint... Within the range of 1:1.05-1.1 equivalent ratio of secondary amines in aspartic acid ester to isocyanate groups in the curing agent, changes in the curing agent content have little impact on the performance of orange peel texture paint. In fact, with the increase of curing agent content, the salt spray resistance of orange peel texture paint even decreases to a certain extent. It can be inferred that when the equivalent ratio of secondary amines in modified polyaspartic acid ester to isocyanate groups in the curing agent is 1:1.1, the secondary amines have basically reacted completely, while there is still excess curing agent. This excess curing agent mixed in with the orange peel texture paint has a slight negative impact on the performance of the orange peel texture paint.

[0078] Of the nine embodiments, the test data for Embodiments 5 and 6 were relatively poor. The main difference between these two embodiments and the other embodiments was the lower content of modified polyaspartic acid ester. In Embodiment 5, the modified polyaspartic acid ester content was 35 parts by weight, including 20 parts by weight of GRET420 and 15 parts by weight of GRET520. In Embodiment 6, the modified polyaspartic acid ester content was 40 parts by weight, including 30 parts by weight of GRET420 and 10 parts by weight of GRET520. The alkali resistance time for both was less than 1 minute. 68 hours is considered an unacceptable duration. In the other examples where the mass fraction of modified polyaspartic acid ester is greater than 40, the alkali resistance time is greater than 168 hours. Furthermore, by comparing Examples 5 and 6, it can be seen that the test times in Example 6 are greater than those in Example 5. Therefore, it can be concluded that the performance of orange peel texture paint is not only related to the individual contents of modified polyaspartic acid esters GXET420 and GXET520, but also to their combined contents. The higher the combined contents of the two, the better the performance of the orange peel texture paint, and ideally, the combined mass fraction of the two should be greater than 40 parts.

[0079] Of the nine embodiments, the test data of Embodiments 3, 4, and 7 are better. Comparing the three embodiments, it can be seen that except for weather resistance, Embodiment 3 is the best in all performance aspects. The difference between the three embodiments is that the proportion of EVA resin in Embodiment 3 is higher. Thanks to the good water resistance of EVA resin, the orange peel paint with a higher proportion of EVA resin has better acid and alkali resistance, salt spray resistance, and weather resistance. Compared with Embodiment 7, Embodiment 3 still has better weather resistance than Embodiment 7 even with a lower content of modified polyaspartic acid ester. It can be seen that EVA resin also has a positive effect on enhancing the weather resistance of orange peel paint. Finally, compared with Embodiments 2, 4, 5, 6, 7, 8, and 9, the proportion of EVA resin in Embodiment 3 is only slightly increased. This shows that EVA resin has a significant improving effect on the performance of orange peel paint.

[0080] Compared with Comparative Example 2, Comparative Example 1, and Comparative Example 2, the acid and alkali resistance, weather resistance, and other properties of Comparative Example 1 and Comparative Example 2 were significantly reduced. This indicates that when other macromolecular organic compounds are used to modify polyaspartic acid ester, even if an orange peel effect can be obtained, the various surface properties of the paint are significantly reduced. EVA resin has stable chemical properties and good aging and corrosion resistance. In addition, EVA resin has a closed-cell structure that can prevent water molecules from penetrating, giving EVA resin good waterproof and moisture-proof properties, thus providing good anti-corrosion properties. CAB has UV resistance. Therefore, the weather resistance of the prepared orange peel paint is not inferior to that of the orange peel paint prepared with EVA resin. However, because CAB contains hydrophilic hydroxyl groups, it is easily corroded by acid and alkali ions and salt ions in water, resulting in poor acid and alkali resistance and salt spray resistance. Ethyl cellulose has relatively stable chemical properties and is insoluble in water, theoretically possessing better paint surface properties. However, due to the poor solubility of ethyl cellulose in the solvents of orange peel paint, propylene glycol and butanol, as well as in polyaspartic acid ester, the properties of ethyl cellulose cannot be applied to the orange peel paint, and may even reduce the properties of the orange peel paint.

[0081] Reference Figure 1 , Figure 2 and Figure 3The three figures are schematic diagrams of the orange peel texture paint from Examples 1, 3, and 5, respectively. Since the orange peel effect mainly comes from the molecular weight difference between EVA resin and polyaspartic acid ester, three schematic diagrams of orange peel texture paint with different EVA resin contents were selected. It can be seen from the figures that the paint surface structure of the three figures is similar, thus concluding that the EVA resin content in the range of 3%-8% has little impact on the orange peel texture effect of the paint surface. The orange peel texture paint surfaces in the three figures all have obvious orange peel texture effects. In the vertical direction, the height difference of the orange peel texture is uniform, and there are no places where the orange peel texture is too obvious. Therefore, the orange peel texture paint surface can appear more uniform and consistent in visual effect. In the horizontal direction, although the orange peel texture bumps are of different sizes, the difference is not significant, which can more realistically simulate the real texture of the orange surface, making the orange peel texture paint surface more beautiful.

[0082] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A modified aspartic polyurea orange peel paint, characterized in that, Includes component A and component B. Based on the weight of component A, component A comprises the following raw materials by weight: 30-60 parts modified polyaspartic acid ester, 4-9 parts organic solvent A, 0.3-1.5 parts filler, 40-70 parts pigment, 0.4-0.9 parts dispersant, 1-2 parts adhesion promoter, 0.2-0.5 parts leveling agent, 0.2-0.5 parts defoamer, and 0.2-0.5 parts antifoamer; Based on the weight of component B, component B comprises the following raw materials by mass: 90-95 parts of curing agent and 5-10 parts of organic solvent B; The mass fraction ratio of component A to component B is 100:30-55; Based on the weight of the modified polyaspartic ester, the modified polyaspartic ester comprises the following raw materials by weight: 80 parts of polyaspartic ester, 3-8 parts of EVA resin, and 12-17 parts of organic solvent C; the preparation method of the modified polyaspartic ester is as follows: EVA resin and organic solvent C are mixed, heated and stirred until the EVA resin melts, then polyaspartic ester is added and stirred evenly to obtain the modified polyaspartic ester; the curing agent is a curing agent containing isocyanate groups; Wherein, organic solvent A and organic solvent B are both mixed solutions of butyl acetate and propylene glycol methyl ether acetate, wherein the volume ratio of the two is butyl acetate:propylene glycol methyl ether acetate = 1:0.4-0.5, and organic solvent C is butyl acetate.

2. The modified aspartic polyurea orange peel paint according to claim 1, characterized in that, The modified polyaspartic ester includes two different polyaspartic esters.

3. The modified aspartic polyurea orange peel paint according to claim 1, characterized in that, The filler includes carbon black and silica.

4. The modified aspartic polyurea orange peel paint according to claim 1, characterized in that, The pigments include titanium dioxide and zinc phosphate.

5. A method for preparing the modified aspartic polyurea orange peel paint as described in any one of claims 1-4, characterized in that, The preparation method includes the following steps: Preparation of component A: The prepared modified polyaspartic acid ester was mixed with organic solvent A, and a dispersant was added. The mixture was stirred until homogeneous to obtain a mixture. Pigments and fillers are added to the mixture and mixed thoroughly, then ground until no particles remain. After grinding, add adhesion promoter, leveling agent, defoamer and antifoamer, mix well to form component A, and seal and store. Preparation of component B: Mix the curing agent with organic solvent B and stir until homogeneous to form component B, then seal and store. The preparation of component A and component B were carried out at room temperature and pressure.

6. A method of using the orange peel texture paint prepared by the method described in claim 5, characterized in that, Under normal temperature and pressure, open the sealed components A and B, mix them, stir evenly, apply to the construction surface, and dry to form an orange peel textured paint finish.

7. The method of using orange peel texture paint according to claim 6, characterized in that, The orange peel paint coating is applied to the surface of a metal casing or metal sheet.

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