Inorganic silicate anti-skinning agent and application of inorganic silicate anti-skinning agent in inorganic silicate coating for preventing exposure and resisting skinning and cracking in barrel

Abstract

According to the inorganic silicate anti-skinning agent and the application of the inorganic silicate anti-skinning agent in an inorganic silicate coating capable of preventing exposure and resisting skinning and cracking in a barrel, the inorganic silicate coating comprises water, aluminum silicate, active white mud, citric acid, nano silicon dioxide, a fluorine-containing polymer, benzoyl hydroquinone ether, phenethyl carboxybenzoate and butyl hydroxybenzene. The anti-skinning agent is prepared from the following raw materials: polydimethylsiloxane, butylated hydroxytoluene, butylated hydroxytoluene, gamma-aminopropoxytrimethoxysilane, an inorganic silicate anti-skinning agent, sodium dodecyl benzene sulfonate and an acrylate stabilizer. According to the anti-exposure inorganic silicate coating capable of resisting skinning and cracking in the barrel, the nano silicon dioxide, the aluminum silicate and the active white mud are adopted as main raw materials, and various additives and stabilizers such as the inorganic silicate anti-skinning agent are added, so that the anti-exposure inorganic silicate coating has very good anti-exposure and anti-skinning performance in the barrel, the coating does not fall off or fade, and the coating is non-toxic and harmless, and has a good anti-aging effect. No harm is caused to the environment and human bodies.

Description

Technical Field

[0001] The invention belongs to the field of inorganic coatings, and in particular relates to an inorganic silicate anti-skinning agent and application thereof in an inorganic silicate coating for preventing sun exposure and skinning and cracking in barrels. Background Art

[0002] With the development of human society, the quality and performance requirements of building materials are getting higher and higher. As an excellent material widely used in the fields of construction, thermal insulation, fire protection, etc., inorganic silicate coatings are also increasingly attracting attention. However, most inorganic silicate coatings on the market are easily exposed to sunlight during transportation or storage, resulting in defects such as crusting and cracking in the barrel, which seriously affects their use effect. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an inorganic silicate anti-skinning agent and its application in an inorganic silicate coating for preventing sun exposure and skinning and cracking inside barrels. Nano silicon dioxide, aluminum silicate and activated white mud are used as main raw materials, and various additives and stabilizers such as the inorganic silicate anti-skinning agent are added to make the coating have good sun exposure protection and anti-skinning performance inside barrels, the coating will not fall off or fade, and it is non-toxic and harmless, and will not cause harm to the environment and human body.

[0004] To solve the above problems, the present invention is implemented through the following technical solutions:

[0005] The first object of the present invention is:

[0006] Provided is an inorganic silicate anti-skinning agent, which is prepared by reacting 4-hydroxybenzotriazine or its derivatives with an organic silicon material, and comprises the following preparation steps:

[0007] s1. Preparation of reaction solvent:

[0008] Take an appropriate amount of anhydrous organic solvent: dimethylformamide or acetonitrile, and stir evenly under the protection of added inert gas nitrogen to prepare a reaction solvent;

[0009] Preferably:

[0010] Choose an anhydrous organic solvent with high purity, such as dimethylformamide or acetonitrile. Before operation, use inert gas nitrogen for protection to prevent moisture or oxygen in the solvent from entering; pass nitrogen into the operation container and maintain normal air pressure; pour the required amount of anhydrous organic solvent into an appropriate container, use a magnetic stirrer or mechanical stirrer to stir, ensure sufficient uniformity, until the solvent is fully mixed; after mixing is complete, the required reaction solvent is obtained;

[0011] s2. Synthesis of intermediates:

[0012] Adding 4-hydroxybenzotriazine or its derivative into the reaction solvent prepared in step S1, and stirring at a temperature range of 50 to 60° C. to fully dissolve it;

[0013] The mass percentage of the added amount of 4-hydroxybenzotriazine or its derivatives is 20-40%;

[0014] s3. Addition of silicon source:

[0015] In the reaction mixture of the intermediate prepared in step s2, gradually add the organic silicon material triethoxysilane TES or methyltriethoxysilane MTES, and the reaction temperature should be kept in the range of 80 to 90° C. during the reaction, and the reaction time is 4 to 8 hours;

[0016] The mass percentage of the added amount of the organic silicon material triethoxysilane TES or methyltriethoxysilane MTES is 40-80%;

[0017] s4. Elimination of inorganic salts:

[0018] After the reaction in step s3 is completed, the reaction mixture is filtered or centrifuged to remove the formed inorganic salts or impurities;

[0019] s5. Removal of solvent:

[0020] Removing the residual solvent from the reaction product by appropriate evaporation or volatilization treatment;

[0021] s6. Drying treatment:

[0022] The raw product prepared in step s5 is usually in a wet state and needs to be dried by vacuum drying or oven drying to remove residual solvent and moisture;

[0023] s7. The dried product of step s6 is pulverized to obtain the desired particle size and shape, thereby preparing an inorganic silicate anti-skinning agent.

[0024] The inorganic silicate anti-skinning agent of the present invention is further optimized as follows:

[0025] It also includes step s8:

[0026] s8. Perform quality analysis on the inorganic silicate anti-skinning agent prepared in step s7 to ensure that it meets the requirements.

[0027] The inorganic silicate anti-skinning agent of the present invention is further optimized as follows:

[0028] It includes one or a combination of the following technical features:

[0029] In steps s1 to s3, the protection of inert gas nitrogen must be maintained to prevent the influence of moisture and oxygen;

[0030] In step s3, the reaction temperature and time are controlled according to specific synthesis requirements, and the reaction usually takes several hours to several days.

[0031] The second object of the present invention is:

[0032] Provided is an inorganic silicate coating that is resistant to sun exposure and cracking of barrel skin, comprising the following components in percentage by mass:

[0033] 10-20% water, 30-40% aluminum silicate, 5-10% activated white mud, 0.5-2% citric acid, 10-20% nano silicon dioxide, 5-10% fluorine-containing polymer, 1-2% benzoyl hydroquinone ether, 2-3% carboxybenzoic acid phenylethyl ester, 1-2% butylhydroxybenzene, 1-2% di-tert-butyl-p-cresol, 0.5-2% gamma-aminopropoxytrimethoxysilane, 3-5% of the above-mentioned inorganic silicate anti-skinning agent, 0.5-2% sodium dodecylbenzene sulfonate, 1-2% acrylate stabilizer, and the sum of all the components is 100%.

[0034] The inorganic silicate anti-skinning agent of the present invention can prevent ultraviolet radiation, thereby effectively preventing the coating from aging due to sunlight ultraviolet radiation; in addition, the addition of the inorganic silicate anti-skinning agent can ensure the mutual air permeability between the coating and the environment, thereby stabilizing the substrate and preventing the coating from cracking and skinning due to its own expansion or contraction. In addition, the inorganic silicate anti-skinning agent of the present invention can effectively inhibit the skinning phenomenon in the barrel of the inorganic silicate coating under outdoor exposure through mechanisms such as anti-oxidation, barrier, and reduction of hardening reaction, thereby maintaining the good performance of the inorganic silicate coating. (1) Antioxidant effect: The active ingredients in the inorganic silicate anti-skinning agent of the present invention can chemically react with silicate ions in the coating to form stable compounds. These compounds can effectively inhibit the oxidation reaction of ions and prevent the oxidation process of the coating, thereby reducing the occurrence of skinning in the coating barrel. (2) Barrier effect: The inorganic silicate anti-skinning agent of the present invention forms a uniform protective film on the surface of the coating, which can block the entry of air and moisture. This can reduce the contact between the coating and the external environment, reduce the oxidation rate of the coating, and thus avoid the occurrence of skinning. (3) Reduce the hardening reaction: The inorganic silicate anti-skinning agent of the present invention reduces the hardening reaction by regulating the reaction process in the paint. This can prevent the paint from hardening and forming a skin prematurely in the barrel and maintain the fluidity of the paint.

[0035] The inorganic silicate coating for preventing sun exposure and resisting skinning and cracking in barrels of the present invention is further optimized as follows:

[0036] The chemical composition of aluminum silicate is Al2SiO5, which is composed of aluminum ions Al 3+ and silicate ions SiO4 4- The compound has high surface activity and water absorption, can form a protective film on the surface of the coating to inhibit the evaporation of water, has high chemical stability and heat resistance, can maintain stability under high temperature conditions, and as a coating thickener, plays a role of thickening, lubrication and anti-precipitation in the coating, improving the stability and fluidity of the coating. In the present invention, aluminum silicate is used as a functional filler to play an anti-skinning and anti-exposure performance, while providing the chemical stability of the coating to extend the service life of the coating.

[0037] The inorganic silicate coating for preventing sun exposure and resisting skinning and cracking in barrels of the present invention is further optimized as follows:

[0038] The main components of the activated white mud are:

[0039] Montmorillonite and illite, the chemical formulas are Na 0.33 Al2Si4O 10 (OH) 2。 nH2O and K 0.6 Al2Si4O 10 (OH)2.nH2O, the crystal structure is a layered structure. The molecular forces between ions in the layered structure provide good toughness and provide the paint film with good crack resistance; the interlayer ion exchange capacity and water molecule adsorption capacity are very strong, with good dispersibility and adsorption, and it has a large specific surface area, which can form a large number of nano-scale pores and micropores in the paint, thereby improving the air permeability, moisture permeability and adhesion of the paint. In the present invention, the activated white mud provides the technical solution with good deformation resistance to prevent cracking, so that the coating film has the ability to resist cyclic deformation, and prevents the paint in the barrel from cracking and falling off when exposed to the sun.

[0040] The inorganic silicate coating for preventing sun exposure and resisting skinning and cracking in barrels of the present invention is further optimized as follows:

[0041] The average particle size of the nano-silicon dioxide is 20 nm. The size of the nano-silicon dioxide small particles can match the wavelength of ultraviolet rays, so that it can effectively absorb and reflect ultraviolet rays, thereby reducing the erosion and oxidation of the coating by ultraviolet rays, protecting the coating from oxidation and fading, and effectively improving the sun protection and anti-skinning ability of the inorganic silicate coating, while having the functions of enhancing hardness, air permeability and anti-microbial contamination.

[0042] In addition, citric acid is used in the present invention to adjust the pH value of the coating to prevent the skinning caused by excessive pH. Inorganic silicate coatings contain silicates, and silicates can form skins at a specific temperature, which will affect the quality and use effect of the coating. Therefore, adding citric acid can effectively adjust the pH value in the coating to maintain it within a suitable range, thereby preventing the skinning of silicates. In addition, citric acid can also be used as a complexing agent in inorganic silicate coatings to react with metal ions to improve the performance and stability of the coating. This method can improve the corrosion resistance and adhesion of the coating, and can also effectively reduce the impact of the coating on the environment.

[0043] Benzoyl hydroquinone ether and carboxybenzoic acid phenethyl ester are used as ultraviolet absorbers in the present invention, which can effectively absorb ultraviolet rays, thereby slowing down or preventing the occurrence of skinning and shedding.

[0044] In the present invention, butyl hydroxybenzene and di-tert-butyl p-cresol are used as antioxidants, which can inhibit the activity of oxygen molecules and reduce the oxidation rate of the film, thereby extending the service life of the paint film.

[0045] In the present invention, γ-aminopropoxytrimethoxysilane is used as a silane coupling agent, which can enhance the adhesion between the coating and the substrate and improve the adhesion and water resistance of the coating.

[0046] The use of sodium dodecylbenzene sulfonate in the present invention can reduce the surface tension between the coating and the substrate, thereby improving its covering ability and adhesion, and enhancing the durability of the coating. In addition, it can improve the dispersibility of the coating of this scheme and increase the viscosity, thereby reducing the skinning tendency of the coating and improving the coating quality and durability.

[0047] The acrylic stabilizer used in the present invention can absorb ultraviolet rays and prevent them from damaging the coating, thereby improving the light resistance and durability of the coating. In addition, during the coating construction process, if the coating is too thick or the drying speed is too fast, the coating surface is prone to skinning. The acrylic stabilizer can control the drying speed of the coating, thereby effectively preventing the coating surface from skinning.

[0048] The third invention object of the present invention is:

[0049] Provided is a method for preparing the aforementioned inorganic silicate coating that is resistant to sun exposure and cracking of the barrel skin, comprising the following preparation steps:

[0050] S1. Weigh according to the proportion:

[0051] Nano-silica, fluorinated polymer, aluminum silicate, activated white mud, citric acid, benzoyl hydroquinone ether, phenylethyl carboxybenzoate, butylhydroxybenzene, di-tert-butyl-p-cresol, γ-aminopropoxytrimethoxysilane, inorganic silicate anti-skinning agent, sodium dodecylbenzene sulfonate, acrylate stabilizer;

[0052] S2. Add citric acid to an appropriate amount of water and stir evenly;

[0053] S3. Stir aluminum silicate and activated white mud with water respectively;

[0054] S4. The three liquids obtained in steps S2 and S3 are mixed, and nano-silica is added and mixed evenly with a stirrer;

[0055] S5. The fluorinated polymer is added to the mixture obtained in step S4 while continuing to stir evenly;

[0056] S6. Benzoyl hydroquinone ether, phenylethyl carboxybenzoate, butylhydroxybenzene, di-tert-butyl-p-cresol, γ-aminopropoxytrimethoxysilane, inorganic silicate anti-skinning agent, sodium dodecylbenzene sulfonate, and acrylate stabilizer are added to the mixture, and mixed again with a stirrer;

[0057] S7. The mixed solution obtained in step S6 is filtered through a sieve to remove insoluble matter;

[0058] S8. Pour the filtrate obtained in step S7 into a paint bucket and stir evenly before use.

[0059] The preparation method of the inorganic silicate coating for preventing sun exposure and resisting barrel crusting and cracking of the present invention is further optimized as follows:

[0060] In all the preparation steps described, all ingredients should be ensured to be in a dry state to prevent bubbles from appearing on the coating surface;

[0061] After all the preparation steps are completed, seal the cover in time to prevent the paint from drying out;

[0062] In addition, all the preparation steps described above strictly follow the ratio of adding each component, and avoid omission, wrong addition, etc.

[0063] In all the preparation steps described, attention should be paid to the control of stirring speed and time to ensure that the components in the coating are evenly dispersed.

[0064] The inorganic silicate coating for preventing sun exposure and resisting skinning and cracking inside the barrel prepared by the present invention has the following characteristics:

[0065] (1) Anti-cyclic deformation ability: The combination of activated white mud and fluorine-containing polymer provides better paint film toughness in the middle and late stages of film formation, preventing cracking at high temperatures.

[0066] (2) Anti-skinning: During the preparation of the inorganic silicate coating of the present invention, the added antioxidant and inorganic silicate anti-skinning agent slow down the formation of skinning.

[0067] (3) Characteristics of inorganic silicates: The present invention is mainly prepared based on inorganic silicates, retaining all the characteristics of inorganic silicates, such as acid and alkali resistance, corrosion resistance, and fire resistance.

[0068] (4) Good adhesion: The inorganic silicate coating of the present invention has good adhesion performance and is easy to apply during the construction process. It can adhere well to the surface of the base layer, making the surface flatter and smoother, thereby improving its decorativeness and aesthetics.

[0069] In order to overcome the defects of existing coatings, the inventors considered using additives to improve the structure and performance of inorganic silicate coatings. Additives, as a material that controls and improves material properties, can improve the stability, UV resistance and weather resistance of coatings without changing the base materials of coatings, and effectively prevent coating skinning, shedding and fading. At the same time, the selection of additives needs to take into account their environmental protection and cost-effectiveness.

[0070] During the preparation process, we need to add appropriate additives to the basic raw materials such as silicate, cement and lime to prepare new inorganic silicate coatings with properties such as anti-exposure, anti-skinning, UV resistance and environmental protection. The selection of additives needs to be rigorously tested and evaluated to ensure that their performance is stable, environmentally friendly and cost-effective. At the same time, the preparation method of the coating also needs to be carefully discussed and optimized to ensure that its preparation process is feasible, simple and cost-effective.

[0071] By improving inorganic silicate coatings with additives, this technology can improve the quality and performance of coatings, thereby meeting people's needs for high quality, environmental protection, durability and economy, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] Figure 1 A comparison chart of the skinning conditions of the coatings prepared with and without the addition of an inorganic silicate anti-skinning agent;

[0073] Figure 2 A comparison chart of the results of the coatings prepared with or without the addition of aluminum silicate;

[0074] Figure 3 The crusting condition of the barrel and barrel cover of commercially available inorganic silicate coating after being exposed to the sun for 7 days outdoors;

[0075] Figure 4 This is the crusting condition of the barrel and barrel cover of the inorganic silicate coating prepared by the present invention after being exposed to the sun outdoors for 7 days. DETAILED DESCRIPTION

[0076] In order to make the application, technical scheme and advantages of the present invention more clear, the present invention is described in detail in conjunction with specific embodiments. It should be understood that the embodiments are only used to illustrate the present invention, but not to limit the protection scope of the present invention. All simple improvements to the preparation method of the present invention under the premise of the concept of the present invention belong to the protection scope of the present invention.

[0077] Example 1 An inorganic silicate coating for exterior walls that is resistant to sun exposure and cracking of barrel interior skinning and a preparation method thereof

[0078] Raw materials (mass percentage):

[0079] Water 14%, nano-silica 14%, fluorinated polymer 10%, aluminum silicate 40%, activated white mud 10%, citric acid 2%, benzoyl hydroquinone ether 1%, carboxybenzoic acid phenylethyl ester 2%, butyl hydroxybenzene 1%, di-tert-butyl p-cresol 1%, γ-aminopropoxy trimethoxy silane 0.5%, inorganic silicate anti-skinning agent 3%, sodium dodecylbenzene sulfonate 0.5%, acrylate stabilizer 1%;

[0080] Preparation method:

[0081] In a 1L dispersion tank, weigh 140g of water, the speed of the disperser is 500rpm, add 20g of citric acid, disperse and stir evenly, then add 400g of aluminum silicate and 100g of activated white mud to the dispersion tank respectively, stir at low speed, add 140g of nano silicon dioxide and 100g of fluorine-containing polymer, stir evenly, disperse at high speed for 20 minutes, then add 10g of benzoyl hydroquinone ether, 20g of carboxybenzoic acid phenylethyl ester, 10g of butylhydroxybenzene, 10g of di-tert-butyl-p-cresol in turn, continue to stir evenly for 10 minutes, then 5g of γ-aminopropoxytrimethoxysilane, 30g of inorganic silicate anti-skinning agent, 5g of sodium dodecylbenzene sulfonate, and 10g of acrylic stabilizer in turn to the dispersion tank, continue to stir evenly for 15 minutes, filter the obtained mixture through a sieve to remove insoluble matter; pour the filtrate into a paint bucket and stir evenly before use.

[0082] Example 2: This scheme is an inorganic silicate coating for preventing inner skinning of barrels for interior walls without adding benzoyl hydroquinone ether, phenylethyl carboxybenzoate, butylhydroxybenzene, and di-tert-butyl-p-cresol, and its preparation method

[0083] Raw materials (mass percentage):

[0084] Water 16%, nano-silicon dioxide 15%, fluorine-containing polymer 10%, aluminum silicate 40%, activated white mud 10%, citric acid 1%, γ-aminopropoxytrimethoxysilane 0.50%, inorganic silicate anti-skinning agent 5%, sodium dodecylbenzene sulfonate 0.50%, acrylate stabilizer 2%;

[0085] Preparation method:

[0086] In a 1L dispersion tank, weigh 160g of water, set the dispersion machine speed to 500rpm, add 10g of citric acid, disperse and stir evenly, then add 400g of aluminum silicate and 100g of activated white mud to the dispersion tank respectively, stir at low speed, add 150g of nano silicon dioxide and 100g of fluorine-containing polymer, stir evenly, disperse at high speed for 20 minutes, then add 5g of γ-aminopropoxytrimethoxysilane, 50g of inorganic silicate anti-skinning agent, 5g of sodium dodecylbenzene sulfonate and 20g of stabilizer to the dispersion tank in turn, continue to stir evenly for 15 minutes, filter the obtained mixture through a sieve to remove insoluble matter, pour the filtrate into a paint bucket, and stir evenly before use.

[0087] The inorganic silicate coating for interior walls prepared by the present embodiment has the advantage of anti-skinning. Aluminum silicate and activated white mud have good dispersibility and stability, which can effectively prevent the coating from skinning during transportation, and can ensure the quality and stability of the coating, thereby improving the use effect of the coating in interior wall decoration. In addition, the present embodiment adds an inorganic silicate anti-skinning agent, with an addition amount of 5%. The inorganic silicate anti-skinning agent can enhance the adsorption between the coating particles, thereby improving the stability and durability of the coating, and helping to prevent the coating from skinning during transportation. Acrylate stabilizers are also added in the present embodiment, which have the effect of pressure-enhancing the stability of the coating, and can prevent the coating from unevenly changing due to vibration, impact, etc. during transportation, thereby reducing the possibility of skinning.

[0088] Comparative Example 1: The basic composition of Comparative Example 1 is the same as that of Example 1, except that no activated white mud raw material is added, and the proportion of the raw material without activated white mud is replaced by diatomaceous earth.

[0089] Raw materials (mass percentage):

[0090] Water 14%, nano-silica 14%, fluorinated polymer 10%, aluminum silicate 40%, diatomaceous earth 10%, citric acid 2%, benzoyl hydroquinone ether 1%, carboxybenzoic acid phenylethyl ester 2%, butyl hydroxybenzene 1%, di-tert-butyl p-cresol 1%, γ-aminopropoxy trimethoxy silane 0.5%, inorganic silicate anti-skinning agent 3%, sodium dodecylbenzene sulfonate 0.5%, acrylate stabilizer 1%;

[0091]

[0092]

[0093] In the process of preparing inorganic silicate coatings for interior walls, if diatomaceous earth or other fillers are used instead of active white mud raw materials, a series of problems will arise:

[0094] First, other fillers lack the hygroscopicity and anti-skinning properties of activated white mud. Therefore, when the paint is exposed to the sun in the barrel, skinning is likely to occur, making it difficult to stir the paint evenly.

[0095] In addition, alternative fillers tend to aggregate when exposed in the barrel, which in turn causes the paint to clump. This caking phenomenon causes the paint to agglomerate and reduce the quality of the paint. Therefore, when preparing inorganic silicate paint for interior walls, adding active white mud raw materials is of great significance. It can not only improve the fluidity and uniformity of the paint, but also avoid the paint from crusting and caking when exposed in the barrel.

[0096] Comparative Example 2: Comparative Example 2 has the same basic composition as Example 1, except that no inorganic silicate anti-skinning agent is added, and the insufficient proportion of raw materials is replaced by benzoyl hydroquinone ether, phenylethyl carboxybenzoate, butylhydroxybenzene, and di-tert-butyl-p-cresol.

[0097] Raw materials (mass percentage):

[0098] Water 14%, nano-silica 14%, fluorinated polymer 10%, aluminum silicate 40%, activated white mud 10%, citric acid 2%, benzoyl hydroquinone ether 1.5%, carboxybenzoic acid phenylethyl ester 2.5%, butyl hydroxybenzene 2%, di-tert-butyl p-cresol 2%, γ-aminopropoxytrimethoxysilane 0.5%, sodium dodecylbenzene sulfonate 0.5%, acrylate stabilizer 1%.

[0099] If the inorganic silicate anti-skinning agent is not added, the paint will easily form a skin after being stored in the barrel for a long time. The comparison results are shown in Figure 1 The left picture shows that no inorganic silicate anti-skinning agent is added.

[0100] If inorganic silicate anti-skinning agent is not added, the following problems may occur:

[0101] A hard film is formed on the surface of the paint, which seriously affects the performance and coating effect, leading to construction difficulties, uneven coating and quality degradation.

[0102] The ions in the paint are easily oxidized, causing the paint to deteriorate, discolor and lose its protective function.

[0103] Without adding inorganic silicate anti-skinning agent, the paint in the paint bucket will tend to harden prematurely, reducing fluidity and increasing construction difficulty and time.

[0104] Therefore, it is very important to add inorganic silicate anti-skinning agent to the coating. Inorganic silicate anti-skinning agent can inhibit the oxidation reaction of ions in the coating, prevent skinning and maintain the performance. The protective film it forms blocks the entry of air and moisture, slows down the oxidation rate and prolongs the service life. Inorganic silicate anti-skinning agent also regulates the reaction process, reduces early hardening, maintains fluidity and makes construction smoother.

[0105] In summary, the addition of inorganic silicate anti-skinning agent is crucial to the anti-skinning performance of coatings.

[0106] Comparative Example 3: Comparative Example 3 has the same basic composition as Example 1, except that aluminum silicate is not added, and the insufficient proportion of aluminum silicate raw material is replaced by calcium silicate.

[0107] Water 14%, nano-silica 14%, fluorine-containing polymer 10%, calcium silicate 40%, activated white mud 10%, citric acid 2%, benzoyl hydroquinone ether 1%, carboxybenzoic acid phenylethyl ester 2%, butyl hydroxybenzene 1%, di-tert-butyl p-cresol 1%, γ-aminopropoxytrimethoxysilane 0.5%, inorganic silicate anti-skinning agent 3%, sodium dodecylbenzene sulfonate 0.5%, acrylate stabilizer 1%.

[0108] Aluminum silicate has high surface activity and water absorption, and can form a protective film to inhibit the evaporation of water, thereby reducing the possibility of paint skinning in the barrel. Calcium silicate may not be as effective as aluminum silicate in this regard because its chemical composition and properties are different from aluminum silicate. Aluminum silicate has high chemical stability and heat resistance, and can maintain stability under high temperature conditions while extending the service life of the paint. The comparison results of the two can be seen in Figure 2 , the right picture shows without adding aluminum silicate.

[0109] Aluminum silicate can be used as a thickener for paint to increase the viscosity and fluidity of the paint, improve the stability of the paint, and prevent precipitation and separation. Aluminum silicate can form a protective film, inhibit the evaporation of water, reduce the possibility of paint crusting in the barrel, and provide paint with anti-exposure properties to prevent the paint from deteriorating under sunlight.

[0110] In summary, aluminum silicate plays an important role in this scheme and can improve the stability, fluidity and anti-skinning properties of the coating.

[0111] Control Example: The control example compares the inorganic silicate coating with the commercially available inorganic silicate coating to observe the crusting of the barrel cover after outdoor exposure.

[0112] Because there are no products with similar composition and proportion to the technical solution in the existing public technology, and there are large differences in composition and dosage between the commonly used inorganic silicate coating formulas on the market and the formula of the technical solution, and the comparative proportions outside the composition and proportion specified by the technical solution may not necessarily be qualified products, so it is more practical to select commercially available products with similar composition and proportion to the technical solution for comparison, which is more meaningful for analyzing and comparing the effects of the products.

[0113] 1. Composition and proportion of commercially available inorganic silicate coatings

[0114] Main raw materials (mass percentage):

[0115] Water 20%, nano-silicon dioxide 15%, calcium carbonate 30%, titanium dioxide 5%, potassium silicate 20%, acrylic emulsion 5%, wetting, thickening and other additives 5%;

[0116] 2. The composition and proportion of the inorganic silicate coating of the present invention

[0117] Raw materials (mass percentage):

[0118] Water 14%, nano-silica 15%, fluorinated polymer 10%, aluminum silicate 40%, activated white mud 10%, citric acid 1%, benzoyl hydroquinone ether 1%, di-tert-butyl-p-cresol 1%, γ-aminopropoxy trimethoxy silane 0.50%, inorganic silicate anti-skinning agent 5%, sodium dodecylbenzene sulfonate 0.50%, acrylate stabilizer 2%;

[0119] 3. Prepare inorganic silicate coatings according to the above preparation method, fill the prepared coatings into 18L iron barrels, press the barrel lids, and expose them outdoors for 7 days. After 7 days, observe the crusting conditions of the commercially available inorganic silicate coatings and the coatings prepared by the present invention in the barrels and on the barrel lids.

[0120] Comparison results:

[0121] The crusting of the barrel cover of the commercially available inorganic silicate coating exposed to the sun for 7 days is as follows Figure 3 Shown: The crust is severely cracked.

[0122] The inorganic silicate coating prepared by the present invention is exposed to the sun outdoors for 7 days. The condition of the inside and cover of the barrel is as follows: Figure 4 Shown: No crusting or cracking.

[0123] To sum up, the above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the disclosed technical content are regarded as equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

[0124] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0125] The experimental methods without specific conditions in the present invention are usually carried out under conventional conditions or conditions recommended by the manufacturer.

[0126] Unless otherwise stated, the various optimization technical solutions in the present invention can be combined with each other.

[0127] Unless otherwise indicated, percentages and parts are by weight.

[0128] Experimental methods without specific conditions specified in the instructions and examples are usually carried out under conventional conditions or conditions recommended by the manufacturers.

[0129] Unless otherwise defined, all professional and scientific terms used herein 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 to the method of the present invention.

Claims

1. An inorganic silicate anti-skinning agent, characterized in that: It is prepared by reacting 4-hydroxybenzotriazine or its derivatives with organic silicon materials, and includes the following preparation steps: s1. Preparation of reaction solvent: Take an appropriate amount of anhydrous organic solvent: dimethylformamide or acetonitrile, and stir evenly under the protection of added inert gas nitrogen to prepare a reaction solvent; s2. Synthesis of intermediates: Add 4-hydroxybenzotriazine or its derivatives to the reaction solvent prepared in step S1, and stir at a temperature range of 50 to 60° C. to fully dissolve it; The mass percentage of the added amount of 4-hydroxybenzotriazine or its derivatives is 20-40%; s3. Addition of silicon source: In the reaction mixture of the intermediate prepared in step s2, gradually add the organic silicon material triethoxysilane TES or methyltriethoxysilane MTES, and the reaction temperature should be kept in the range of 80 to 90° C. during the reaction, and the reaction time is 4 to 8 hours; The mass percentage of the added amount of the organic silicon material triethoxysilane TES or methyltriethoxysilane MTES is 40-80%; s4. Elimination of inorganic salts: After the reaction in step s3 is completed, the reaction mixture is filtered or centrifuged to remove the formed inorganic salts or impurities; s5. Removal of solvent: Removing the residual solvent from the reaction product by appropriate evaporation or volatilization treatment; s6. Drying treatment: The raw product prepared in step s5 is usually in a wet state and needs to be dried by vacuum drying or oven drying to remove residual solvent and moisture; s7. The dried product of step s6 is pulverized to obtain the desired particle size and shape, thereby preparing an inorganic silicate anti-skinning agent.

2. The inorganic silicate anti-skinning agent according to claim 1, characterized in that: It also includes step s8: s8. Perform quality analysis on the inorganic silicate anti-skinning agent prepared in step s7 to ensure that it meets the requirements.

3. The inorganic silicate anti-skinning agent according to claim 1, characterized in that: It includes one or a combination of the following technical features: In steps s1 to s3, the protection of inert gas nitrogen needs to be maintained to prevent the influence of moisture and oxygen.

4. An inorganic silicate coating that is resistant to sun exposure and cracking of the barrel, characterized in that: It includes the following components in percentage by weight: 10-20% water, 30-40% aluminum silicate, 5-10% activated white mud, 0.5-2% citric acid, 10-20% nano silicon dioxide, 5-10% fluorine-containing polymer, 0-2% benzoyl hydroquinone ether, 0-3% carboxybenzoic acid phenylethyl ester, 0-2% butylhydroxybenzene, 0-2% di-tert-butyl-p-cresol, 0.5-2% γ-aminopropoxytrimethoxysilane, 3-5% of the inorganic silicate anti-skinning agent according to claim 1, 0.5-2% sodium dodecylbenzene sulfonate, 1-2% acrylate stabilizer, and the sum of all the components is 100%.

5. The inorganic silicate coating for preventing sun exposure and resisting barrel crusting and cracking according to claim 4 is characterized in that: The chemical composition of aluminum silicate is Al2SiO5, which is composed of aluminum ions Al 3+ and silicate ions SiO4 4- The compound composed of.

6. The inorganic silicate coating for preventing sun exposure and resisting barrel crusting and cracking according to claim 4, characterized in that: The main components of the activated white mud are: Montmorillonite and illite, the chemical formulas are Na 0.33 Al2Si4O 10 (OH) 2。 nH2O and K 0.6 Al2Si4O 10 (OH)2.nH2O, the crystal structure is a layered structure.

7. The inorganic silicate coating for preventing sun exposure and resisting barrel crusting and cracking according to claim 4, characterized in that: The average particle size of the nano silicon dioxide is 20 nm.

8. A method for preparing the inorganic silicate coating for preventing sun exposure and resisting barrel crusting and cracking as claimed in claim 4, characterized in that: It comprises the following preparation steps: S1. Weigh according to the proportion: Nano-silica, fluorinated polymer, aluminum silicate, activated white mud, citric acid, benzoyl hydroquinone ether, phenylethyl carboxybenzoate, butylhydroxybenzene, di-tert-butyl-p-cresol, γ-aminopropoxytrimethoxysilane, inorganic silicate anti-skinning agent, sodium dodecylbenzene sulfonate, acrylate stabilizer; S2. Add citric acid to an appropriate amount of water and stir evenly; S3. Stir aluminum silicate and activated white mud with water respectively; S4. The three liquids obtained in steps S2 and S3 are mixed, and nano-silica is added and mixed evenly with a stirrer; S5. The fluorinated polymer is added to the mixture obtained in step S4 while continuing to stir evenly; S6. Benzoyl hydroquinone ether, phenylethyl carboxybenzoate, butylhydroxybenzene, di-tert-butyl-p-cresol, γ-aminopropoxytrimethoxysilane, inorganic silicate anti-skinning agent, sodium dodecylbenzene sulfonate, and acrylate stabilizer are added to the mixture, and mixed again with a stirrer; S7. The mixed solution obtained in step S6 is filtered through a sieve to remove insoluble matter; S8. Pour the filtrate obtained in step S7 into a paint bucket and stir evenly before use.

9. The method for preparing the inorganic silicate coating for preventing sun exposure and resisting inner barrel crusting and cracking according to claim 8, characterized in that: In all the preparation steps described, all ingredients should be ensured to be in a dry state to prevent bubbles from appearing on the coating surface; After all the preparation steps described are completed, seal in time to prevent the paint from drying out.

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