CN117534326A - Preparation method of rock plate protection glaze and printed rock plate - Google Patents

Abstract

The invention discloses a rock plate protective glaze and a preparation method for printing rock plates. The rock plate protective glaze includes the following raw materials by weight: 35-55 parts of basic glaze; 45-55 parts of organic solvent; 0.04-0.12 parts of defoaming agent; 0.04-0.08 parts of leveling agent; glaze anhydrous 4-8 parts of dispersant. The preparation method of the printed rock plate includes the following steps: spraying the rock plate protective glaze to the rock plate body for sintering. The present invention introduces a glaze anhydrous dispersant into the rock plate protective glaze to ensure that the glaze does not contain moisture, thereby reducing the problem of moisture in the glaze penetrating into the green body and improving the bonding strength between the glaze layer and the green body. , enhancing the strength and durability of the rock slab.

Description

A kind of rock plate protective glaze and preparation method of printing rock plate

Technical field

The invention relates to the technical field of rock panels, and in particular to a rock panel protective glaze and a preparation method for printing rock panels.

Background technique

In recent years, with the rapid rise of ceramic inkjet technology in the ceramic industry, ceramic manufacturing companies have introduced ceramic digital inkjet printers to replace traditional printing processes to meet market demand.

However, as far as the current technical situation is concerned, the processing of rock slabs usually adopts the digital glaze spraying process, that is, the method of digitally printing glaze. However, in existing slate protective glazes, a basic formula consisting of basic glaze, organic solvent, defoaming agent, leveling agent and aqueous dispersant is usually used. However, this slate protective glaze is essentially an aqueous suspension, which easily penetrates into the interior of the slate body. The resulting problems have a significant negative impact on the strength and durability of the product. Especially during the firing process, this penetration phenomenon may lead to the occurrence of cracking and even reduce the rupture modulus of the rock slab in the final product, thereby affecting the overall strength and service life of the product.

The weaknesses brought about by this penetration phenomenon severely restrict the quality and stability of the rock slab manufacturing process. Due to the presence of aqueous dispersants, the protective glaze for rock slabs is more likely to penetrate into the capillary pores and cracks of the body during the coating process, resulting in an insufficiently tight bond between the coating and the body, thus affecting the overall structure and performance of the rock slab. . This is especially noticeable during the firing process. The volatilization of the coating and the sintering process may cause water to evaporate, making the bond between the coating and the body more fragile. This phenomenon further causes the problem of cracking during the firing process of rock slabs, destroying the appearance and quality of the product. What's more serious is that this problem may extend into the final product, resulting in insufficient strength of the rock slab, thus affecting its durability during use.

Contents of the invention

In view of the above technical shortcomings, an innovative solution is urgently needed to overcome these technical difficulties. This solution must be able to improve the stability during the preparation and application of the slate protective glaze, ensure a good bond between the coating and the body, and maintain stable performance during the firing and use stages. Against this technical background, the present invention emerged as the times require. By introducing an anhydrous dispersant for the glaze and a corresponding preparation process, it innovatively solves the core problem in the preparation process of the glaze for protecting rock slabs.

The technical problem to be solved by the present invention is to provide a rock plate protective glaze and a preparation method for printing rock plates.

The specific technical solutions of the present invention are:

The invention discloses a rock plate protective glaze, which includes the following raw materials in parts by weight:

35-55 parts of basic glaze;

45-55 parts of organic solvent;

Defoaming agent 0.04-0.12 parts;

Leveling agent 0.04-0.08 parts;

4-8 parts of glaze water-free dispersant.

The glaze anhydrous dispersant is prepared by the following method:

(1) Add acrylic compounds and styrene to N,N-dimethylformamide;

(2) Add polyethylene glycol dimethacrylate;

(3) Add sodium methacrylate sulfonate;

(4) Add benzoyl peroxide;

(5) Stir for 60-180 minutes;

(6) Cool to room temperature.

Preferably, a glaze anhydrous dispersant is prepared by the following method:

(1) At 70-80°C, in a nitrogen environment, add 50-60g acrylic compound and 20-30g styrene dropwise to 30-50g N,N-dimethylformamide while stirring at 100-300 rpm. ;

(2) Add 5-15g polyethylene glycol dimethacrylate dropwise;

(3) Add 1-3g sodium methacrylate sulfonate and stir at 100-300 rpm for 5-15 minutes;

(4) Add 1-3g benzoyl peroxide dropwise;

(5) 70-80℃, 100-300 rpm, stir for 60-180 minutes;

(6) Cool to room temperature to obtain the glaze anhydrous dispersant.

Preferably, the dropping speeds of steps (1), (2) and (4) are all 0.2-1.0g/minute.

Preferably, the acrylic compound is at least one of acrylic acid, methacrylic acid, isopentaerythrityl tetraacrylate and pentaerythritol triacrylate.

Preferably, the organic solvent is methanol, ethanol, ethylene glycol, diethylene glycol, n-propanol, glycerin, isopropyl alcohol, acetone, butanol, butanone, butanediol, cyclohexanone, butyl acetate , at least one of butyl propionate, butyl butyrate and diethylene glycol monobutyl ether.

Preferably, the defoaming agent is SN-DEFOAMER485 defoaming agent, SN-DEFOAMER77-P defoaming agent, SN-Defoamer470 defoaming agent, BASF Foamstar_SI2210 defoaming agent, Japan's Shin-Etsu KMZ-7752 defoaming agent, Germany's Evonik At least one of TEGOFoamex805N defoamer or TEGOFoamex810 defoamer.

Preferably, the leveling agent is at least one of leveling agent BYK-333, leveling agent BYK-358N, leveling agent BYK-306 or leveling agent EFKA-3770.

The invention also discloses a method for preparing rock plate protective glaze, which includes the following steps: adding organic solvent, defoaming agent, leveling agent, glaze anhydrous dispersant and basic glaze into a sand mill and grinding evenly , to obtain a suspension.

Preferably, zirconia balls with a diameter of 0.5-1.5 mm are used as grinding media, the sanding time is 2-8 hours, and the grinding speed is 500-1500 rpm.

The invention also discloses a method for preparing a printed rock plate, which includes the following steps: spraying the rock plate protective glaze onto the rock plate body and sintering.

Preferably, a method for preparing a printed rock board includes the following steps: using an inkjet machine to spray the rock board protective glaze onto the rock board body, controlling the spraying amount to 20-80g/㎡, at 1150-1250°C Sintering 40-80min.

The present invention introduces a glaze anhydrous dispersant into the rock plate protective glaze to ensure that the glaze does not contain moisture, thereby reducing the problem of moisture in the glaze penetrating into the green body and improving the bonding strength between the glaze layer and the green body. , enhancing the strength and durability of the rock slab.

Detailed ways

A kind of rock plate protective glaze, including the following weight parts of raw materials:

35-55 parts of basic glaze;

45-55 parts of organic solvent;

Defoaming agent 0.04-0.12 parts;

Leveling agent 0.04-0.08 parts;

4-8 parts of glaze water-free dispersant.

The glaze anhydrous dispersant is prepared by the following method:

(1) At 70-80°C, in a nitrogen environment, add 50-60g acrylic compound and 20-30g styrene dropwise to 30-50g N,N-dimethylformamide while stirring at 100-300 rpm. ;

Acrylic compounds and styrene are used as monomers for polymerization reactions. These polymers will become the main components of the dispersant and affect its performance;

N,N-dimethylformamide mainly plays the role of dissolving, mixing and providing a reaction environment;

Stirring and heating to 70-80℃ helps mix the raw materials and make them evenly dispersed;

Introducing nitrogen can create an inert atmosphere to prevent the reaction system from oxidation or other interference;

(2) Add 5-15g polyethylene glycol dimethacrylate dropwise;

Polyethylene glycol dimethacrylate is used as a cross-linking agent to introduce cross-linking points during the polymerization reaction, increase the network structure of the material, and improve the strength, stability and durability of the material;

(3) Add 1-3g sodium methacrylate sulfonate and stir at 100-300 rpm for 5-15 minutes;

Sodium methacrylate sulfonate, as a chain transfer agent, is used to control the molecular weight in polymerization reactions; it is introduced into the polymerization reaction to limit the growth of the polymer chain by capturing the polymerization active center, thereby controlling the molecular weight and molecular weight distribution of the polymer. ;

(4) Add 1-3g benzoyl peroxide dropwise;

Benzoyl peroxide is used as an initiator for free radical polymerization. When heated, it decomposes to produce free radicals, thereby starting the polymerization reaction;

(5) 70-80℃, 100-300 rpm, stir for 60-180 minutes;

Controlling the temperature at 70-80°C will help maintain appropriate reaction rate and product quality; continue the reaction for 60-180 minutes to ensure that the polymerization reaction reaches an appropriate level and the required polymer is formed;

(6) Cool to room temperature to obtain the glaze anhydrous dispersant.

Preferably, the dropping speeds of steps (1), (2) and (4) are all 0.2-1.0g/minute.

Preferably, the acrylic compound is at least one of acrylic acid, methacrylic acid, isopentaerythrityl tetraacrylate and pentaerythritol triacrylate.

The basic glaze is usually composed of two main types of raw materials to achieve specific properties and effects of the coating: (1) Natural mineral raw materials: These raw materials come from the natural mineral resources of the earth, such as wollastonite, albite , quartz, kaolin, burnt talc, feldspar, limestone, dolomite, zircon, etc. They can be used as fillers or pigments to give color, texture and decorative properties to coatings. (2) Inorganic non-metallic materials: These raw materials include inorganic metal oxides such as zinc oxide, alumina, zirconium silicate, aluminum hydroxide, calcium hydrogen phosphate, magnesium fluoride, etc. They play an important role in coatings, affecting the coating's hiding, hardness, adhesion and protective properties. The combination and proportion of these raw materials can be adjusted according to the target performance and desired effect of the coating to achieve the final coating quality. They work together to provide the coating with the desired functionality and properties.

In the present invention, common basic glaze formulas in this field can be used, for example:

The basic glaze is composed of the following raw materials by weight: 10-20% potash feldspar powder, 15-20% quartz powder, 15-25% kaolin, 3-5% microaluminum powder, 4-6% cooked talc powder , 5-10% Yuzhou soil, 10-20% Pingtian washing mud and 15-25% wollastonite.

The basic glaze is composed of the following raw materials in weight percentages: 13-16% aluminum oxide, 67-75% silica, 2.5-5% calcium oxide, 2-4.5% magnesium oxide, 3 -5% potassium oxide and 2-3% sodium oxide.

The basic glaze is composed of the following raw materials in weight percentage: feldspar 15-25%, aluminum hydroxide 4-10%, zirconium silicate 8-15%, quartz powder 23-37%, zinc oxide 2-6% , calcium hydrogen phosphate 13-20%, magnesium fluoride 4-10%.

The basic glaze is composed of the following raw materials in weight percentage: wollastonite 10-12%, albite 38-42%, kaolin 5-10%, burnt talc 3-5%, calcined zinc oxide 3-4% , calcined alumina 11-14% and bright frit powder 20-23%.

The basic glaze is composed of the following raw materials by weight: 31 parts of quartz, 28 parts of feldspar, 15 parts of calcite, 4 parts of dolomite, 2.5 parts of talc, 2 parts of alumina, 4.2 parts of zinc oxide, 2.3 parts of kaolin, silicon 11 parts of zirconium acid.

The organic solvent is methanol, ethanol, ethylene glycol, diethylene glycol, n-propanol, glycerol, isopropyl alcohol, acetone, butanol, methyl ethyl ketone, butanediol, cyclohexanone, butyl acetate, propionic acid At least one of butyl ester, butyl butyrate and diethylene glycol monobutyl ether.

The defoaming agent is a commonly used defoaming agent in this field, and can be SN-DEFOAMER485 defoaming agent, SN-DEFOAMER77-P defoaming agent, SN-Defoamer470 defoaming agent, BASF Foamstar_SI2210 defoaming agent, Japan Shin-Etsu KMZ-7752 defoaming agent Foaming agent, at least one of German Evonik TEGO Foamex805N defoaming agent or TEGO Foamex810 defoaming agent.

The leveling agent is a commonly used leveling agent in this field, such as at least one of leveling agent BYK-333, leveling agent BYK-358N, leveling agent BYK-306 or leveling agent EFKA-3770.

The invention also discloses a method for preparing rock plate protective glaze, which includes the following steps: adding organic solvent, defoaming agent, leveling agent, glaze anhydrous dispersant and basic glaze into a sand mill and grinding them evenly , the suspension is obtained, which is the rock plate protective glaze of the present invention. Preferably, zirconia balls with a diameter of 0.5-1.5 mm are used as grinding media, the sanding time is 2-8 hours, and the grinding speed is 500-1500 rpm.

The process of preparing rock slab protective glaze includes the following key steps: First, prepare the required raw materials, including organic solvents, defoaming agents, leveling agents, glaze anhydrous dispersants and basic glazes. Then, these raw materials are added to the sand mill in specific proportions. Sand mill is used as a mixing, stirring and grinding equipment, in which the raw materials are fully mixed and stirred to achieve a uniform dispersion state. After a period of grinding and mixing in a sand mill, the raw materials are fully integrated with each other to form a uniform suspension. This step is crucial as it ensures the effective mixing of the various ingredients, thus guaranteeing consistent performance of the final product. Through this process, the raw materials are thoroughly mixed and dispersed in the organic solvent to form a stable suspension. The obtained suspension is the prepared rock plate protective glaze. This suspension can be applied directly to slate surfaces to achieve protection, decoration and other desired properties. The entire preparation process is carried out in sequence, ensuring the uniform dispersion of raw materials, and finally obtaining a high-quality rock slab protective glaze.

A method for preparing a printed rock plate, including the following steps: using an inkjet machine to spray the rock plate protective glaze on the rock plate body, controlling the spraying amount to 20-80g/ ^m2 , and sintering at 1150-1250°C for 40 -80min.

First, use an inkjet machine to spray the pre-prepared rock slab protective glaze on the surface of the rock slab body. This step is intended to evenly apply the glaze to the surface of the slate for protection and decoration purposes. During the spraying process, attention needs to be paid to controlling the spraying amount, that is, the amount of glaze sprayed per square meter, which ranges from 20-80g/square meter. During the spraying process, the amount of spraying needs to be precisely controlled to ensure a uniform coating on the surface of the rock slab. The control of spray volume is directly related to the thickness and quality of the final coating. Applying too much may result in an uneven or thick coating, while applying too little may not provide the desired protection. The sprayed rock slab body needs to enter the sintering process to fuse the coating with the body and form a stable protective layer. The sintering temperature is between 1150-1250℃, and the sintering time is 40-80 minutes. During the sintering process, the coating reacts chemically with the slab body, solidifying and fusing at the same time to form a strong protective layer. The purpose of the entire preparation method is to protect and decorate the rock slab by spraying the rock slab protective glaze on the surface of the rock slab body and then sintering it at an appropriate temperature. The control of spray volume, sintering temperature and time all have an important impact on the quality and performance of the final product. After spraying and sintering, a protective coating will be formed on the surface of the rock slab. This layer of coating can provide the required protection function of the slab and also achieve a decorative effect. The entire preparation process requires precise control of various parameters to obtain high-quality printed rock slabs.

The innovation of the present invention is that the glaze water-free dispersant is introduced into the rock plate protective glaze, thereby effectively eliminating the influence of moisture on the glaze. The introduction of the glaze water-free dispersant ensures that the glaze does not contain moisture, so when it is applied to the surface of the stone slab, there will be no problem of moisture penetrating into the interior of the body. This key feature solves the problem of traditional aqueous suspension glazes easily penetrating the body, thereby avoiding possible cracking during the firing process. By reducing moisture penetration, the overall strength of the slab is significantly improved because the bond between the glaze and the body is enhanced, making the final slab product more durable and stable.

The advantage of this innovative solution is not only that it improves the strength and durability of the rock slabs, but also that it brings a more reliable and stable production process to the rock slab industry. Due to the introduction of water-free dispersants for glazes, the production process is no longer subject to fluctuations in moisture content, thereby avoiding problems with coating uniformity and stability. Slate manufacturing companies can more reliably control the production process, improving product consistency and quality.

In the examples and comparative examples of the present invention, some of the raw materials used are specifically introduced as follows:

The basic glaze is composed of the following raw materials by weight: 31 parts of quartz, 28 parts of feldspar, 15 parts of calcite, 4 parts of dolomite, 2.5 parts of talc, 2 parts of alumina, 4.2 parts of zinc oxide, 2.3 parts of kaolin, and zirconium silicate 11 servings. (Refer to "Sanitary Ceramics Raw Materials and Mud Glaze Formulas, 2018 Edition edited by Xu Xiwu"). Add the above raw materials into a ball mill in proportion, grind for 48 hours, and pass through a 2000 mesh sieve to make a basic glaze.

Methoxypolyethylene glycol dimethacrylate, MPEG400MA, was purchased from Nantong Zhuangzhuang Chemical Co., Ltd.

Example 1:

A. Preparation of water-free dispersant for glaze:

(1) At 70°C, in a nitrogen environment, add 55g of acrylic compound and 25g of styrene dropwise into 40g of N,N-dimethylformamide while maintaining stirring at 200 rpm;

(2) Add 10g of polyethylene glycol dimethacrylate (PEGDMA2k) dropwise;

(3) Add 2g sodium methacrylate sulfonate and stir at 200 rpm for 10 minutes;

(4) Add 2g benzoyl peroxide dropwise;

(5) 75℃, 200 rpm, stir for 120 minutes;

(6) Cool to room temperature to obtain a transparent viscous liquid substance, which is the glaze anhydrous dispersant of the present invention.

Among them, the dropping speeds in steps (1), (2) and (4) are all 0.5g/minute.

The acrylic compound is acrylic acid.

B. Preparation of rock slab protective glaze:

Add 50 parts by weight of organic solvent glycerin, 0.06 parts by weight of TEGO Foamex805N defoaming agent, 0.06 parts by weight of leveling agent BYK-333, 6 parts by weight of the glaze anhydrous dispersant prepared above and 45 parts by weight of the basic glaze prepared above. Grind evenly in a mill to obtain a suspension, which is the rock plate protective glaze of the present invention. Zirconia balls with a diameter of 1mm are used as grinding media, the sanding time is 5 hours, and the grinding speed is 1000rpm.

C. Preparation of printed rock slabs:

Use an inkjet machine to spray the rock plate protective glaze prepared above on the rock plate body, control the spraying amount to 50g/m ² , and sinter at 1190°C for 60 minutes to prepare the printed rock plate of the present invention.

Example 2:

The difference from Example 1 is that in the preparation process of the glaze anhydrous dispersant, the acrylic compound is methacrylic acid.

Example 3:

The difference from Example 1 is that during the preparation process of the glaze anhydrous dispersant, the acrylic compound is isopentyl tetraacrylate.

Example 4:

The difference from Example 1 is that during the preparation process of the glaze anhydrous dispersant, the acrylic compound is pentaerythritol triacrylate.

Example 5:

The difference from Example 1 is that in the preparation process of the glaze anhydrous dispersant, the 55g acrylic compound is 25g methacrylic acid and 30g pentaerythritol triacrylate.

Comparative example 1:

The difference from Example 1 is that during the preparation process of the glaze anhydrous dispersant, N,N-dimethylformamide was replaced by an equal weight of N-methylpyrrolidone.

Comparative example 2:

The difference from Example 1 is that during the preparation process of the glaze anhydrous dispersant, polyethylene glycol dimethacrylate (PEGDMA2k) was replaced by an equal weight of methoxypolyethylene glycol dimethacrylate.

Comparative example 3:

The difference from Example 1 is that during the preparation process of the glaze anhydrous dispersant, sodium methacrylate sulfonate was replaced by an equal weight of phosphopropionic acid.

Comparative example 4:

The difference from Example 1 is that during the preparation process of the glaze anhydrous dispersant, benzoyl peroxide was replaced by an equal weight of azobisisobutyl cyanide.

Comparative example 5:

The difference from Example 1 is that: during the preparation process of the glaze anhydrous dispersant, N,N-dimethylformamide was replaced by an equal weight of N-methylpyrrolidone; polyethylene glycol dimethacrylate (PEGDMA2k) Replace with equal weight of methoxypolyethylene glycol dimethacrylate; replace sodium methacrylate sulfonate with equal weight of mercaptopropionic acid; replace benzoyl peroxide with equal weight of azobisisobutyl cyanide.

Comparative example 6:

The difference from Example 1 is that in the preparation process of the rock plate protective glaze, the dispersant used is BSF Company. PA25CL-FR dispersant (polyacrylic acid aqueous solution).

Blank example:

Unsintered and unglazed slate body.

Test example 1:

Test method for sedimentation rate of slate protective glaze:

(1) Add 100g of the rock plate protective glaze prepared in the Examples and Comparative Examples into clean cylindrical glass bottles respectively;

(2) Seal the mouth of the glass bottle with a cap to prevent external air from entering the bottle, thereby maintaining the stability of the internal environment;

(3) Place the sealed glass bottle in a constant environment with the temperature set to 65±1°C. This is a constant temperature environment to simulate the stability of the glaze under high temperature conditions;

(4) Let the glass bottle stand in an environment of 65±1℃ for 10 days;

(5) After the resting period, open the bottle cap and pour out the glaze gently, then turn the glass bottle upside down for 5 minutes to allow part of the glaze hanging on the bottle wall to drip;

(6) Weigh the final glass bottle and record it as Y grams, and the previously clean glass bottle as X grams;

(7) Calculate the precipitation rate of the rock slab protective glaze = (Y-X)/100×100%.

Sedimentation rate is a ratio that refers to the proportion of glaze that ends up adhering to the side and inner walls of a glass bottle compared to the total glaze after an inversion test. The lower the settling rate, the greater the glaze's ability to remain stable under certain conditions, indicating that the glaze is more suitable for printing or spraying on rock slabs. This means the glaze is less likely to separate or settle and remains evenly dispersed in high-temperature environments, providing better quality and results.

Table 1 Test results of precipitation rate of rock plate protective glaze

Slab protection glaze precipitation rate, % Example 1 8.7 Example 2 9.5 Example 3 8.0 Example 4 7.5 Example 5 6.2 Comparative example 1 9.7 Comparative example 2 10.1 Comparative example 3 10.6 Comparative example 4 9.0 Comparative example 5 13.5

The precipitation rates of the rock plate protective glazes in Examples 1 to 5 are respectively between 6.2-9.5%. The precipitation rates of these examples are relatively low, indicating that the glaze can maintain good uniform dispersion under high temperature conditions and is not easy to separate or precipitate. This helps ensure the quality and consistency of glazes printed or sprayed onto rock slabs.

The precipitation rates of Comparative Examples 1 to 5 were respectively between 9.7-13.5%. Compared with the examples, the precipitation rates of these comparative examples are higher, which means that the glazes of these formulas are more likely to separate or precipitate under high temperature conditions, thus affecting their stability and quality.

Taken together, the rock plate protective glaze of the embodiment shows a lower precipitation rate, which reflects its strong ability to maintain stability under high temperature conditions. This further proves that the glaze water-free dispersant introduced in the present invention has a positive effect on improving the stability and quality of the rock plate protective glaze, so that it is suitable for printing or spraying on the rock plate, ensuring that the product has better quality and effect. .

Test example 2:

The printed rock plates prepared in the Examples and Comparative Examples were tested for modulus of rupture performance using the method of "GBT 3810.4-2016 Ceramic Tile Test Methods Part 4: Determination of Modulus of Fracture and Destruction Strength".

Table 2 Test results of fracture modulus performance of printed rock slabs

The modulus of rupture of Examples 1 to 5 ranges from 60.5 to 64.9 MPa. These examples show a higher modulus of rupture after using the rock plate protective glaze of the present invention, indicating that the bending and tensile resistance of the rock plate is enhanced and the overall strength is higher.

The modulus of rupture of Comparative Examples 1 to 5 ranges from 55.7 to 59.9MPa. These comparative examples use different ingredients and have lower modulus of rupture than the results of the examples. This may mean that some comparative formulations also have certain strength properties to a certain extent, but are significantly inferior to the examples of the present invention.

The modulus of rupture of Comparative Example 6 is 42.6MPa, which is the lowest value among all tests. This indicates that the formulation of this comparative example has a greater negative impact on the strength properties of the rock slab, possibly due to some issues in the ingredient selection process.

Taken together, the embodiments of the present invention show obvious advantages in modulus of rupture performance and have higher bending resistance and tensile resistance. This further confirms that the introduction of slate protective agents as glaze water-free dispersants plays an important role in improving the overall strength and durability of the product.

In the process of preparing the water-free dispersant for glazes, different raw materials play a key role, jointly building a stable polymerization reaction environment and ensuring that the prepared water-free dispersant has excellent performance. The following is the role of each raw material and its performance in experimental data:

Acrylic compounds and styrene: participate in the polymerization reaction as monomers and form the main components of the dispersant. The selection of these ingredients and the polymerization process directly affect the final performance characteristics. Experimental data show that different acrylic compounds have differences in performance, pentaerythritol triacrylate > isopenterythrityl tetraacrylate > acrylic acid > methacrylic acid.

N,N-dimethylformamide: plays the role of dissolving and mixing in the reaction, and provides a suitable reaction environment to promote the reaction of other raw materials. Experimental data show that its effect is significantly better than N-methylpyrrolidone.

Nitrogen: Nitrogen is introduced to create an inert atmosphere, prevent the reaction process from oxidation or other interference, and ensure that the polymerization reaction proceeds in a stable environment.

Polyethylene glycol dimethacrylate: introduces cross-linking points to form a complex network structure. This helps improve the strength, stability and durability of the glaze. Experimental data shows that its effect is significantly better than that of the cross-linking agent methoxypolyethylene glycol dimethacrylate.

Sodium methacrylate sulfonate: used as a chain transfer agent to control polymer molecular weight and molecular weight distribution. It limits the growth of polymer chains by capturing polymerization active centers to control polymerization reactions. Experimental data shows that its effect is significantly better than that of the chain transfer agent mercaptopropionic acid.

Benzoyl peroxide: As an initiator of free radical polymerization, it generates free radicals through thermal decomposition and initiates the chain growth of the polymerization reaction.

In summary, these different raw materials cooperate with each other to form a stable polymerization reaction system and successfully achieve the preparation of anhydrous dispersants. Experimental data also further confirmed the importance of each raw material in the entire preparation process, providing a solid foundation for the quality and performance of rock slabs.

Further analysis shows that the working principle of sodium methacrylate sulfonate as a chain transfer agent in polymerization reactions involves the mechanism of free radical polymerization. In free radical polymerization, the polymerization active center adjusts the molecular weight and molecular weight distribution of the polymer through chain transfer reactions. The function of the chain transfer agent is to capture and stabilize active free radicals by reacting with free radicals, thereby preventing the continued reaction of free radicals and limiting the growth of the polymer chain. This process can control the growth rate of polymer molecular weight to a certain extent, thereby affecting the molecular weight distribution of the polymer. Specific to the role of sodium methacrylate sulfonate in the process of preparing anhydrous dispersants, its molecular structure contains sulfonic acid groups. This group can react with free radicals during the polymerization reaction to form a stable intermediate. products, thereby trapping and stabilizing free radicals. In the polymerization reaction for preparing anhydrous dispersants, sodium methacrylate sulfonate can react with free radicals in the polymerization reaction, thereby inhibiting the continued reaction of free radicals and limiting the growth of the polymer chain. In this way, the progress of the polymerization reaction will be controlled, and the molecular weight growth rate of the polymer will be reduced, thus affecting the molecular weight distribution of the polymer. This control can make the resulting polymer molecular weight distribution more uniform and help achieve the desired polymer properties. At the same time, compared with sodium methacrylate sulfonate, the chain transfer agent mercaptopropionic acid is less effective. This may be because its molecular structure has a weak ability to react with free radicals in the polymerization reaction and cannot Effectively stabilizes and traps free radicals, making it impossible to effectively regulate polymer chain growth. In short, sodium methacrylate sulfonate, as a chain transfer agent, captures and stabilizes active free radicals by reacting with free radicals during the polymerization reaction, thereby limiting the growth of the polymer chain, achieving control of the polymerization reaction, and affecting the molecular weight and molecular weight of the polymer. The molecular weight distribution. This mechanism explains the experimental data showing that sodium methacrylate sulfonate is more effective than the chain transfer agent mercaptopropionic acid.

Claims (10)

1. The rock plate protective glaze is characterized by comprising the following raw materials in parts by weight:

35-55 parts of basic glaze;

45-55 parts of organic solvent;

0.04-0.12 part of defoaming agent;

0.04-0.08 part of leveling agent;

4-8 parts of a glaze anhydrous dispersing agent.

2. The rock board protection glaze of claim 1, wherein the glaze anhydrous dispersant is prepared by the following method:

(1) Adding acrylic compound and styrene into N, N-dimethylformamide;

(2) Adding polyethylene glycol dimethacrylate;

(3) Adding sodium methacrylate;

(4) Adding benzoyl peroxide;

(5) Stirring for 60-180 minutes;

(6) Cooled to room temperature.

3. The rock board protection glaze of claim 2, wherein the glaze anhydrous dispersant is prepared by the following method:

(1) Dropwise adding 50-60g of acrylic compound and 20-30g of styrene into 30-50g of N, N-dimethylformamide under the condition of maintaining 100-300 revolutions per minute of stirring at 70-80 ℃ and under the nitrogen environment;

(2) Dripping 5-15g of polyethylene glycol dimethacrylate;

(3) Adding 1-3g of sodium methacrylate sulfonate, stirring for 5-15 minutes at 100-300 rpm;

(4) 1-3g of benzoyl peroxide is added dropwise;

(5) Stirring at 70-80 deg.c and 100-300 rpm for 60-180 min;

(6) And cooling to room temperature to obtain the glaze anhydrous dispersing agent.

4. A rock protection glaze as claimed in claim 3, wherein the drop acceleration in steps (1), (2) and (4) is in the range of 0.2 to 1.0 g/min.

5. The rock wool protection glaze of any one of claims 2-4, wherein the acrylic compound is at least one of acrylic acid, methacrylic acid, isovaleryltetraacrylate, and pentaerythritol triacrylate.

6. The rock wool protection glaze of any one of claims 1-4, wherein the organic solvent is at least one of methanol, ethanol, ethylene glycol, diethylene glycol, n-propanol, glycerol, isopropanol, acetone, butanol, butanone, butanediol, cyclohexanone, butyl acetate, butyl propionate, butyl butyrate, and diethylene glycol monobutyl ether.

7. The rock board protection glaze of any one of claims 2-4, wherein the DEFOAMER is at least one of SN-DEFOAMER485 DEFOAMER, SN-DEFOAMER77-P DEFOAMER, SN-DEFOAMER470 DEFOAMER, basf foamstar_si2210 DEFOAMER, japanese signal KMZ-7752 DEFOAMER, germany win-creation tegofoamer 805N DEFOAMER, or tegofoamer 810 DEFOAMER.

8. The rock wool protection glaze of any one of claims 2-4, wherein the leveling agent is at least one of leveling agent BYK-333, leveling agent BYK-358N, leveling agent BYK-306, or leveling agent EFKA-3770.

9. A method for preparing the rock plate protective glaze as claimed in any one of claims 1 to 8, comprising the steps of: adding an organic solvent, a defoaming agent, a leveling agent, a glaze anhydrous dispersing agent and a basic glaze into a sand mill, and grinding uniformly to obtain a suspension.

10. The preparation method of the printed rock plate is characterized by comprising the following steps of: spraying the rock plate-protecting glaze according to any one of claims 1-8 onto the rock plate blank, and sintering.