Water-based grease-resistant woodworking adhesive and preparation method thereof

Abstract

The present invention discloses a water-based grease-resistant woodworking adhesive and a preparation method thereof. The water-based grease-resistant woodworking adhesive of the present invention comprises a polyvinyl alcohol solution, an alkaline silica sol solution, a functional VAE emulsion, a high-performance latex, a pH regulator, a grease affinity agent, a penetration promoter, an inorganic reinforcing agent, water, and other additives. The grease-resistant woodworking adhesive of the present invention is a water-based single-component adhesive having the advantages of being able to dissolve grease on the surface of wood, having strong permeability, strong adhesion to wood, high strength after curing, simple use, and convenient production. Due to its excellent performance, it is particularly suitable for having a very good bonding effect on wood that easily secretes oily resins. This grease-resistant woodworking adhesive is environmentally friendly and non-toxic, does not contain formaldehyde, and can meet various woodworking bonding requirements without the need for a curing agent.

Description

Technical Field

[0001] The present invention relates to a water-based anti-grease woodworking adhesive and a preparation method thereof, in particular to an adhesive suitable for bonding wood that easily secretes oily resin and a preparation method thereof. Background Art

[0002] The wood structures of tung, eucalyptus, olive, yellow fir, coconut, larch, nanmu, silver fir and Chinese fir have normal resin channels, which are easy to secrete oily resins and essential oils. The resin content is rich. During the processing and utilization of wood, the high content of resin and essential oils will affect the subsequent sawing, sanding, gluing and painting of the wood. Once the ambient temperature is high, the resin will penetrate into the surface of the wood and contaminate the wood products. In addition, this type of wood needs to be effectively treated with respect to the resin during the bonding process, thereby improving its processing performance and surface quality and expanding its application range.

[0003] The manufacturing process for wood products typically involves processes such as pressing, paneling, assembly, and veneering. Various wood types are joined together using adhesives to create the finished product. Due to structural issues within some wood, over time or due to external influences such as temperature, humidity, and the environment, some woods secrete resin, which then penetrates the interface between the glue layer and the wood. This resin is typically oily and has low strength and poor adhesion. It also has poor compatibility with the glue layer, dispersing between the wood and the glue layer, thereby affecting the adhesive's ability to adhere to the wood. Consequently, wood with a high oil content is prone to delamination and cracking at the bonded joints, seriously impacting the quality of the finished product. Summary of the Invention

[0004] In view of the shortcomings of current water-based wood glue in bonding oily wood, such as weak bonding and debonding, the present invention provides a water-based grease-resistant wood adhesive.

[0005] In addition, the present invention also provides a preparation method of the water-based grease-resistant woodworking adhesive.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A water-based grease-resistant woodworking adhesive comprising the following components in percentage by weight:

[0008] 25-32% polyvinyl alcohol solution, 5-8% alkaline silica sol, 10-15% functional EVA emulsion, 15-24% high-performance latex, 0.1-2% pH regulator, 0.2-2% oil affinity agent, 0.05-0.1% penetration enhancer, 10-20% inorganic reinforcing material, 0.2-0.6% additives, and 5~20% water.

[0009] As a further embodiment of the present invention, the polyvinyl alcohol solution is RS series or BP series polyvinyl alcohol, with a content of 20 wt% in aqueous solution, and the polyvinyl alcohol model is one or more of BP17, RS217, and RS120.

[0010] As a further solution of the present invention, the alkaline silica sol is a silica sol solution with a silicon dioxide content of 30% and an average particle size of less than 30 nm.

[0011] As a further solution of the present invention, the inorganic reinforcing material is one or more of 4000 mesh calcined calcined terroir, 1000 mesh heavy calcium carbonate, 1200 mesh light calcium carbonate, and titanium dioxide.

[0012] As a further solution of the present invention, the functional VAE emulsion is a VAE emulsion with a Tg of 10-25° C. and capable of self-crosslinking.

[0013] As a further embodiment of the present invention, the high-performance latex is at least one of anionic carboxyl styrene-butadiene latex or aqueous polyurethane emulsion.

[0014] As a further embodiment of the present invention, the pH regulator is one or more of ammonia water, trisodium phosphate, sodium hydroxide, and triethanolamine.

[0015] As a further embodiment of the present invention, the oil affinity agent is dimethylformamide or a ketone solvent, such as acetone.

[0016] As a further embodiment of the present invention, the penetration enhancer is an ethanol or propylene glycol solution of tetrahydropiperine.

[0017] As a further embodiment of the present invention, the auxiliary agent includes a defoamer, a fungicide, a dispersant, a thickener, etc. In a preferred embodiment, the auxiliary agent includes a mixture of Rhodia mineral oil defoamer DF691, an isothiazolinone fungicide, a polycarboxylate sodium salt dispersant SN-5040, a carboxymethyl cellulose thickener, etc.

[0018] The adhesive of the present invention primarily utilizes a high-performance polyvinyl alcohol solvent as the primary adhesive colloid, and a compounded functional VAE emulsion and high-performance latex as the main adhesive. Highly permeable silica sol and a penetration enhancer are added to increase the colloid's penetrating adhesion to wood. The grease affinity agent added to the colloid effectively dissolves the oily resin secreted by the wood, and the inorganic reinforcement added to the formula primarily serves to increase the curing speed and enhance the overall strength of the colloid. The adhesive of the present invention has the advantages of being able to dissolve oil on the surface of wood, exhibiting strong permeability, strong adhesion to wood, high strength after curing, ease of use, and convenient production. Due to its excellent performance, it is particularly suitable for bonding wood that easily secretes oily resin, achieving excellent results. Compared to conventional water-based wood glues, it is more targeted and has a significantly more pronounced bonding effect on oily wood.

[0019] The preparation method of the water-based grease-resistant woodworking adhesive of the present invention is an emulsion compounding and dispersion method, which is carried out in a heatable dispersion kettle and comprises the following steps:

[0020] 1) Preparation of polyvinyl alcohol aqueous solution

[0021] Add water to a stirring kettle, slowly add polyvinyl alcohol powder while stirring, heat to above 90°C, keep warm for 60 minutes to completely dissolve it, and obtain polyvinyl alcohol solution for use;

[0022] 2) Dispersed powder

[0023] The polyvinyl alcohol solution is cooled to below 60°C in the dispersion kettle, some additives are added, and after rapid dispersion for 15 minutes, the inorganic reinforcement is added to the dispersion kettle and dispersed. Samples are taken to check whether the dispersion is uniform. After dispersion, the pH regulator is added in small amounts and multiple times to adjust the pH value of the material to 8.0-8.5, and the dispersed powder is obtained for standby use;

[0024] 3) Mixed emulsion

[0025] Add the functional VAE emulsion and high-performance latex into the stirring kettle, add the remaining additives and penetration enhancer while stirring, and slowly add the silica sol solution into the stirring kettle after 15 minutes while stirring. The addition should be completed in about 30 minutes, and the pH value should be adjusted to 8.0-8.5 by adding the pH regulator to obtain the emulsion mixture for standby use;

[0026] 4) Add the emulsion mixture to the dispersed powder, add water, disperse at high speed, take samples to check whether it is evenly dispersed, take samples to test viscosity, solid content, etc. If the indicators are qualified, filter and package the material.

[0027] Compared with the existing water-based wood glue on the market, the present invention has the following special effects:

[0028] The colloid of the present invention is added with silica sol, which greatly improves the permeability, adhesion and strength of the adhesive after curing. The particle size of silica sol is extremely small, generally between 7-40nm, and it has excellent dispersibility and permeability, and can penetrate into the deep tissue of wood. Moreover, when silica sol is added to the latex, it can form a solid gel structure after drying and curing, which will produce greater adhesion. (2) The woodworking glue is added with a solution of tetrahydropiperine as a strong permeation promoter of the colloid. Tetrahydropiperine is a substance extracted from plants with a strong permeation promoter. It can increase the fluidity of the oil secreted from the wood, promote the diffusion of various active molecules in the colloid between the oil and wood fiber, so that the colloid molecules can better combine with the wood fiber and enhance the adhesion of the adhesive. (3) The added functional VAE emulsion has a relatively high glass transition temperature and can be self-crosslinked. It has very high cohesion and adhesion. After curing, it has good water resistance and good compatibility with fillers, which can greatly improve the comprehensive performance of the woodworking colloid. (4) The resins and essential oils secreted from wood are oily substances. The presence of these oils will significantly affect the bonding between wood and emulsion. In the present invention, an appropriate amount of dimethylformamide (DMF) or ketone solvent is added as an oil affinity agent. In the molecular structure of DMF, the carbon is connected to a double-bonded oxygen, a hydrogen, and a nitrogen, and the nitrogen is connected to two methyl groups. DMF with this molecular structure is not only stable in nature, but also a highly polar solvent that is soluble in water and most solvents. It also has a strong affinity and solubility for organic matter. When the adhesive is bonded to the wood, the oil affinity agent will extract the oily substances, thereby reducing their impact and achieving better bonding between the latex and the wood surface. DETAILED DESCRIPTION

[0029] In order to allow those skilled in the art to understand the present invention more clearly and intuitively, the present invention will be further described below.

[0030] The water-based grease-resistant woodworking adhesive of the present invention comprises the following components in percentage by weight:

[0031] 25-32% polyvinyl alcohol solution, 5-8% alkaline silica sol, 10-15% functional EVA emulsion, 15-24% high-performance latex, 0.1-2% pH regulator, 0.2-2% oil affinity agent, 0.05-0.1% penetration enhancer, 10-20% inorganic reinforcing material, 0.2-0.6% additives, and 5~20% water.

[0032] The polyvinyl alcohol solution is RS series or BP series polyvinyl alcohol, with a content of 20 wt% in aqueous solution, and the polyvinyl alcohol model is one or more of BP17, RS217, and RS120.

[0033] Alkaline silica sol is a silica sol solution with a silicon dioxide content of 30% and an average particle size of less than 30 nm, such as Zhongfa Silica Sol AJN-830.

[0034] The inorganic reinforcing material is one or more of 4000-mesh calcined terroir, 1000-mesh heavy calcium carbonate, 1200-mesh light calcium carbonate, and titanium dioxide.

[0035] Functional VAE emulsions have a Tg of 10-25°C and are self-crosslinking, such as Dalian Chemical VAE emulsion DA-691.

[0036] The high-performance latex is at least one of anionic carboxylated styrene butadiene latex or water-based polyurethane emulsion, such as BASF 417 carboxylated styrene butadiene latex and Wanhua Chemical 1645 polyurethane emulsion.

[0037] The pH regulator is one or more of ammonia water, trisodium phosphate, sodium hydroxide, and triethanolamine.

[0038] The oil affinity agent is dimethylformamide or a ketone solvent, such as acetone.

[0039] The penetration enhancer is a solution of tetrahydropiperine in ethanol or propylene glycol.

[0040] The additives include: a mixture of Rhodia mineral oil defoamer DF691, isothiazolinone fungicide, polycarboxylate sodium salt dispersant SN-5040, carboxymethyl cellulose thickener, etc., which are prepared in a mass ratio of 1:1:1:1.

[0041] Example 1

[0042] The water-based grease-resistant woodworking adhesive of this embodiment includes the following components in percentage by weight:

[0043] Polyvinyl alcohol BP17 30%

[0044] Zhongfa Silica Sol AJN-830 (7-9nm) 7.5%

[0045] Dalian Chemical VAE Emulsion DA-691 12%

[0046] BASF 417 carboxylated styrene butadiene latex 20%

[0047] Sodium hydroxide 0.5%

[0048] Dimethylformamide 1.5%

[0049] Tetrahydropiperine ethanol solution 0.1%

[0050] Heavy calcium carbonate 15%

[0051] Additives 0.6%

[0052] Water 12.8%

[0053] The preparation method of the water-based grease-resistant woodworking adhesive comprises the following steps:

[0054] Step 1: Add 80 parts by weight of water into a stirring kettle, slowly add 20 parts by weight of polyvinyl alcohol BP17 powder while stirring, heat to 95°C, keep warm for 60 minutes to completely dissolve it, and obtain a 20% concentration of polyvinyl alcohol solution for standby use.

[0055] Step 2: Put the dissolved polyvinyl alcohol solution into the dispersion kettle, cool it to 55℃, add dispersant and defoamer, and disperse it quickly for 15 minutes. Then add heavy calcium carbonate into the dispersion kettle and disperse it for 30 minutes. Take samples to check whether it is evenly dispersed. After dispersion, add pH regulator and adjust the pH value of the material to 8.0-8.5 in small amounts and multiple times to obtain dispersed powder for standby use.

[0056] Step 3: Add the functional VAE emulsion and carboxylated styrene-butadiene latex to a stirred kettle. While stirring, add the thickener, fungicide, and tetrahydropiperine ethanol solution. After 15 minutes, slowly add the silica sol solution to the kettle while stirring. The addition should take approximately 30 minutes. Add a pH adjuster to adjust the pH to 8.0-8.5 to obtain an emulsion mixture for later use.

[0057] Step 4: Add the above emulsion mixture to the dispersed powder, add water, disperse at high speed for 30 minutes, take samples to check whether it is evenly dispersed, take samples to test viscosity, solid content, etc., filter and package the material after the indicators are qualified.

[0058] Example 2

[0059] The water-based grease-resistant woodworking adhesive of this embodiment includes the following components in percentage by weight:

[0060] Polyvinyl alcohol RS217 32%

[0061] Zhongfa Silica Sol AJN-830 (15-20nm) 6%

[0062] Dalian Chemical VAE Emulsion DA-905 15%

[0063] Wanhua Chemical 1645 polyurethane emulsion 16%

[0064] Triethanolamine 0.6%

[0065] Dimethylformamide 1.5%

[0066] Tetrahydropiperine propylene glycol solution 0.1%

[0067] Heavy calcium carbonate + light calcium carbonate 16%

[0068] Additives 0.6%

[0069] Water 12.2%

[0070] The preparation method of the water-based grease-resistant woodworking adhesive comprises the following steps:

[0071] Step 1: Add 80 parts by weight of water into a stirring kettle, slowly add 20 parts by weight of polyvinyl alcohol RS217 powder while stirring, heat to 95°C, keep warm for 60 minutes to completely dissolve it, and obtain a 20% concentration of polyvinyl alcohol solution for standby use.

[0072] Step 2: Put the dissolved polyvinyl alcohol solution into the dispersion kettle, cool it to 50℃, add dispersant and defoamer, and disperse it quickly for 15 minutes. Then add heavy calcium carbonate into the dispersion kettle and disperse it for 30 minutes. Take samples to check whether it is evenly dispersed. After dispersion, add pH regulator and adjust the pH value of the material to 8.0-8.5 in small amounts and multiple times to obtain dispersed powder for standby use.

[0073] Step 3: Add the functional VAE emulsion and waterborne polyurethane emulsion to a stirring kettle. While stirring, add the thickener, fungicide, and the propylene glycol solution of tetrahydropiperine, a penetration enhancer. After 15 minutes, slowly add the silica sol solution to the stirring kettle while stirring. The addition should take approximately 30 minutes. Add a pH adjuster to adjust the pH to 8.0-8.5 to obtain an emulsion mixture for later use.

[0074] Step 4: Add the above emulsion mixture to the dispersed powder, add water, disperse at high speed for 30 minutes, take samples to check whether it is evenly dispersed, take samples to test viscosity, solid content, etc., filter and package the material after the indicators are qualified.

[0075] Example 3

[0076] The water-based grease-resistant woodworking adhesive of this embodiment includes the following components in percentage by weight:

[0077] Polyvinyl alcohol (RS217+RS120) 26%

[0078] Zhongfa Silica Sol AJN-830 (7-9nm) 5.5%

[0079] Dalian Chemical VAE Emulsion DA-691 15%

[0080] BASF 417 carboxylated styrene butadiene latex 24%

[0081] Ammonia + triethanolamine 2%

[0082] Acetone 2%

[0083] Tetrahydropiperine propylene glycol solution 0.1%

[0084] Kaolin + titanium dioxide 15%

[0085] Additives 0.6%

[0086] Water 9.8%

[0087] The preparation method of the water-based grease-resistant woodworking adhesive comprises the following steps:

[0088] Step 1: Add 80 parts by weight of water into a stirring kettle, slowly add polyvinyl alcohol RS217 and RS120 powder while stirring, heat to 100°C, keep warm for 60 minutes to completely dissolve them, and obtain a 20% concentration of polyvinyl alcohol solution for standby use.

[0089] Step 2: Put the dissolved polyvinyl alcohol solution into the dispersion kettle, cool it to 55°C, add dispersant and defoamer, and disperse it quickly for 15 minutes. Then add kaolin and titanium dioxide into the dispersion kettle and disperse them for 30 minutes. Take samples to check whether they are evenly dispersed. After dispersion, add pH regulator in small amounts and multiple times to adjust the pH value of the material to 8.0-8.5 to obtain dispersed powder for standby use.

[0090] Step 3: Add the functional VAE emulsion and carboxylated styrene-butadiene latex to a stirred kettle. While stirring, add the remaining additives and the tetrahydropiperine propylene glycol solution. After 15 minutes, slowly add the silica sol solution to the kettle while stirring. The addition should take approximately 30 minutes. Add a pH adjuster to adjust the pH to 8.0-8.5 to obtain an emulsion mixture for later use.

[0091] Step 4: Add the above emulsion mixture to the dispersed powder, add water, disperse at high speed for 30 minutes, take samples to check whether it is evenly dispersed, take samples to test viscosity, solid content, etc., filter and package the material after the indicators are qualified.

[0092] test:

[0093] The reference standard for wood bonding strength test is: Determination of wood breakage rate of glued surface LY / T 2720-2016;

[0094] The reference standard for aging resistance test is: GB / T 8537-2008 "Test method for thermal aging of rubber products";

[0095] D4 water resistance test:

[0096] 1. Let the sample cure for 7 days;

[0097] 2. Soak the sample in boiling water for 4 hours;

[0098] 3. Soak the sample in cold water at room temperature for 1 hour;

[0099] 4. Place the sample in an oven at 50±3℃ for at least 18 hours until the moisture content of the sample drops to the level before the test;

[0100] 5. Check the cracking rate of the glue line. The qualified standard is: the cracking rate is no more than 20%.

[0101] The test results of adhesive properties obtained in Examples 1-3 are as follows:

[0102]

[0103] Note: √ means the wood is damaged or has passed the D4 water resistance test, and × means the wood is debonded or has failed the D4 water resistance test.

[0104] The above test substrates used five different types of wood rich in oil, and three embodiments of the present invention and market brand adhesives were used for comparative experiments. This test used the conventional process of plywood, and after complete curing, the bonding samples were tested for bonding strength, heat resistance, aging resistance and water resistance. From the test results obtained, it can be seen that the water-based grease-resistant wood glue of the present invention exhibits excellent bonding performance when bonding wood that easily secretes oil. When the bonding strength test was carried out, all the wood was destroyed; after 7 days of bonding, the wood could pass the UV heat resistance and aging resistance test and could also pass the D4 water resistance test smoothly.

[0105] In order to study the effects of high-permeability silica sol, penetration enhancer and grease affinity agent on adhesive, a comparative example was set up.

[0106] Comparative Example 1

[0107] The water-based grease-resistant woodworking adhesive of this comparative example differs from that of Example 1 in that no highly permeable silica sol solution is added.

[0108] The water-based anti-grease woodworking adhesive of this comparative example includes the following components in percentage by weight:

[0109] Polyvinyl alcohol BP17 30%

[0110] Dalian Chemical VAE Emulsion DA-691 12%

[0111] BASF 417 carboxylated styrene butadiene latex 20%

[0112] Sodium hydroxide 0.5%

[0113] Dimethylformamide 1.5%

[0114] Tetrahydropiperine ethanol solution 0.1%

[0115] Heavy calcium carbonate 15%

[0116] Additives 0.6%

[0117] Water 20.3%

[0118] Comparative Example 2

[0119] The water-based grease-resistant woodworking adhesive of this comparative example differs from that of Example 1 in that no penetration enhancer is added.

[0120] The water-based anti-grease woodworking adhesive of this comparative example includes the following components in percentage by weight:

[0121] Polyvinyl alcohol BP17 30%

[0122] Zhongfa Silica Sol AJN-830 (7-9nm) 7.5%

[0123] Dalian Chemical VAE Emulsion DA-691 12%

[0124] BASF 417 carboxylated styrene butadiene latex 20%

[0125] Sodium hydroxide 0.5%

[0126] Dimethylformamide 1.5%

[0127] Heavy calcium carbonate 15%

[0128] Additives 0.6%

[0129] Water 12.9%

[0130] Comparative Example 3

[0131] The water-based grease-resistant woodworking adhesive of this comparative example differs from that of Example 1 in that no grease affinity agent is added.

[0132] The water-based anti-grease woodworking adhesive of this comparative example includes the following components in percentage by weight:

[0133] Polyvinyl alcohol BP17 30%

[0134] Zhongfa Silica Sol AJN-830 (7-9nm) 7.5%

[0135] Dalian Chemical VAE Emulsion DA-691 12%

[0136] BASF 417 carboxylated styrene butadiene latex 20%

[0137] Sodium hydroxide 0.5%

[0138] Tetrahydropiperine ethanol solution 0.1%

[0139] Heavy calcium carbonate 15%

[0140] Additives 0.6%

[0141] Water 14.3%

[0142] The test results of adhesive properties obtained in Comparative Examples 1-3 are as follows:

[0143]

[0144] Note: √ means the wood is damaged or has passed the D4 water resistance test, and × means the wood is debonded or has failed the D4 water resistance test.

[0145] Comparative Examples 1-3 lacked the highly permeable silica sol, penetration enhancer, or grease affinity agent, each of which significantly impacts adhesion. The absence of any of these factors results in a failure in the test results for adhesion strength and heat and aging resistance, indicated by an "×." Chinese fir passed all performance tests because its relatively soft texture requires less adhesive force to pass the adhesion strength test and is also more likely to pass the heat and aging resistance test. The addition of a high-performance "VAE emulsion" to the formula leaves water resistance unaffected, indicated by a "√."

[0146] The above description of the embodiments is intended to facilitate understanding and application of the present invention by those skilled in the art. It will be apparent that those skilled in the art can readily make various modifications to these embodiments and apply the general principles described herein to other embodiments without requiring inventive effort. Therefore, the present invention is not limited to the embodiments described herein, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention should fall within the scope of protection of the present invention.

Claims

1. A water-based grease-resistant wood adhesive, characterized in that: The composition includes the following weight percentages: 25-32% polyvinyl alcohol solution, 5-8% alkaline silica sol solution, 10-15% functional EVA emulsion, 15-24% high-performance latex, 0.1-2% pH regulator, 0.2-2% oil affinity agent, 0.05-0.1% penetration enhancer, 10-20% inorganic reinforcing material, 0.2-0.6% additives, and 5-20% water; The oil affinity agent is dimethylformamide or a ketone solvent; The penetration enhancer is an ethanol or propylene glycol solution of tetrahydropiperine.

2. The water-based grease-resistant wood adhesive according to claim 1, characterized in that: The polyvinyl alcohol solution is a polyvinyl alcohol aqueous solution with a content of 20wt%.

3. The water-based grease-resistant wood adhesive according to claim 1, characterized in that: The alkaline silica sol is a silica sol solution with a silicon dioxide content of 30% and an average particle size of less than 30 nm.

4. The water-based grease-resistant wood adhesive according to claim 1, characterized in that: The inorganic reinforcing material is one or more of 4000-mesh calcined terroir, 1000-mesh heavy calcium carbonate, 1200-mesh light calcium carbonate, and titanium dioxide.

5. The water-based grease-resistant wood adhesive according to claim 1, characterized in that: The functional VAE emulsion has a Tg of 10-25° C. and is self-crosslinkable.

6. The water-based grease-resistant wood adhesive according to claim 1, characterized in that: The high-performance latex is at least one of anionic carboxyl styrene-butadiene latex and aqueous polyurethane emulsion.

7. The water-based grease-resistant wood adhesive according to claim 1, characterized in that: The ketone solvent is acetone.

8. The water-based grease-resistant wood adhesive according to claim 1, characterized in that: The auxiliary agent comprises: a mixture of Rhodia mineral oil defoamer DF691, isothiazolinone fungicide, polycarboxylate sodium salt dispersant SN-5040, and carboxymethyl cellulose thickener.

9. The method for preparing the water-based grease-resistant wood adhesive according to any one of claims 1 to 8, wherein: The steps include: 1) Preparation of polyvinyl alcohol aqueous solution Add water to a stirring kettle, slowly add polyvinyl alcohol powder while stirring, heat to above 90°C, keep warm for 60 minutes to completely dissolve it, and obtain polyvinyl alcohol solution for use; 2) Dispersed powder The polyvinyl alcohol solution is cooled to below 60°C in a dispersion kettle, and some additives are added. After rapid dispersion for 15 minutes, the inorganic reinforcing material is added to the dispersion kettle for dispersion. Sampling is performed to check whether the dispersion is uniform. After dispersion, a pH regulator is added in small amounts and multiple times to adjust the pH value of the material to 8.0-8.5, and a dispersed powder is obtained for standby use; the pH regulator is one or more of ammonia water, trisodium phosphate, sodium hydroxide, and triethanolamine; 3) Mixed emulsion Add the functional VAE emulsion and high-performance latex into the stirring kettle, add the remaining additives and penetration enhancer while stirring, and slowly add the silica sol solution into the stirring kettle after 15 minutes while stirring. Add the silica sol solution over 30 minutes, and add the pH regulator to adjust the pH to 8.0-8.5 to obtain the emulsion mixture for use. 4) Add the emulsion mixture to the dispersed powder, add water, disperse at high speed, take samples to check whether it is evenly dispersed, take samples to test viscosity and solid content, filter and package the material after the indicators are qualified.

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