High-performance wall adhesive and preparation method thereof

Abstract

The invention relates to the technical field of wall adhesives, in particular to a high-performance wall adhesive and a preparation method thereof. The high-performance wall adhesive is prepared from the following raw materials in parts by weight: 85 to 102 parts of emulsion A, 66 to 98 parts of emulsion B, 15 to 40 parts of cellulose, 8 to 25 parts of calcium powder, 32 to 51 parts of white sand, 21 to 35 parts of cement and 12 to 18 parts of bactericide, wherein the emulsion A is a chitosan modified cationic emulsion polymer, and the emulsion B is a nanoparticle modified acrylate emulsion. The prepared high-performance wall adhesive is good in bonding strength and has good waterproof and anti-corrosion performance.

Description

Technical Field

[0001] The present invention relates to the technical field of wall adhesives, and more specifically, to a high-performance wall adhesive and a preparation method thereof. Background Art

[0002] High-strength tile adhesives are an important development direction for the bonding technology of building decoration materials. With the widespread application of new wall materials such as ceramic slabs in building decoration, higher requirements are placed on the performance of adhesives. Traditional cement mortar can no longer meet the bonding needs of new wall materials. Therefore, it is particularly important to develop tile adhesives with stronger bonding, better construction performance and environmental protection characteristics. High-strength tile adhesives improve the bonding strength of new wall materials, as well as water resistance, freeze-thaw resistance, aging resistance and other properties. They are of great significance for improving the quality of building decoration, reducing environmental impact and promoting the sustainable development of the industry.

[0003] During the process of gradient cooling of the materials for preparing tile adhesive in the cooling tank, if the cooling in the cooling tank is too slow, the preparation efficiency will be affected; however, if the cooling in the cooling tank is too fast, the temperature distribution inside the material will be uneven, causing changes in thermal stress, density and crystallization behavior, and then affecting the microstructure and physical properties of the material, such as hardness and elastic modulus, etc. In addition, it may also cause changes in chemical activity, differences in physical properties, moisture migration and uneven thermal expansion, and ultimately affect the overall dimensional stability and performance of the material. In the existing technology, it is impossible to solve the impact of uneven temperature distribution of different substances in the material caused by too fast a cooling rate, resulting in thermal forces caused by rapid temperature changes, which affect the durability and reliability of the tile adhesive.

[0004] At present, ordinary cement-based adhesives can only be used for paving in new houses, and cannot be used for paving bricks on bricks in the renovation of old houses. In addition, the normal paving thickness must be at least one centimeter, the highest bonding strength is only 1 MPa, and it has no waterproof performance. Summary of the invention

[0005] The invention provides a high-performance wall adhesive and a preparation method thereof. The prepared high-performance wall adhesive has good bonding strength and good waterproof and anti-corrosion properties.

[0006] In a first aspect, the present invention provides a high-performance wall adhesive, which is composed of the following raw materials in parts by weight: 85-102 parts of A emulsion, 66-98 parts of B emulsion, 15-40 parts of cellulose, 8-25 parts of calcium powder, 32-51 parts of white sand, 21-35 parts of cement, and 12-18 parts of fungicide; Among them, emulsion A is a chitosan-modified cationic emulsion polymer, and emulsion B is a nanoparticle-modified acrylic emulsion.

[0007] Preferably, it is composed of the following raw materials in parts by weight: 92-100 parts of A emulsion, 75-98 parts of B emulsion, 15-32 parts of cellulose, 8-21 parts of calcium powder, 35-45 parts of white sand, 25-30 parts of cement, and 12-18 parts of fungicide.

[0008] Preferably, it is composed of the following raw materials in parts by weight: 95-100 parts of A emulsion, 85-98 parts of B emulsion, 18-30 parts of cellulose, 15-20 parts of calcium powder, 38-40 parts of white sand, 25-30 parts of cement, and 15-18 parts of fungicide.

[0009] Preferably, it is composed of the following raw materials in parts by weight: 100 parts of A emulsion, 85 parts of B emulsion, 25 parts of cellulose, 15 parts of calcium powder, 38 parts of white sand, 25 parts of cement, and 15 parts of fungicide.

[0010] Preferably, the chitosan-modified cationic emulsion polymer adopts the inverse emulsion polymerization technology, and uses methacryloyloxyethyl trimethyl ammonium chloride, acrylamide and N, N-dimethyl acrylamide as polymerization monomers, introduces chitosan, and obtains the modified cationic emulsion polymer; the mass ratio of chitosan to polymerization monomer is 1-3:5-8.

[0011] Preferably, the mass ratio of methacryloyloxyethyltrimethylammonium chloride, acrylamide and N,N-dimethylacrylamide is 2-3:1.2-5:1-8.

[0012] Cationic emulsion polymers are usually synthesized by free radical copolymerization of cationic monomers and nonionic monomers, with methacryloyloxyethyl trimethylammonium chloride, acrylamide and N,N-dimethylacrylamide as polymerization monomers. These monomers form positively charged polymer chains during the polymerization process, which make them exhibit good dispersibility and stability in aqueous solution. Due to the presence of cationic monomers, the surface of the polymer chain carries a positive charge and can interact with negatively charged substances, thereby improving its dispersibility and compatibility.

[0013] Preferably, the nanoparticle modified acrylic emulsion is composed of chloroether resin and vinyl nano-SiO 2 As comonomer, nano-SiO 2 / chloroether resin modified acrylate composite emulsion; vinyl nano-SiO 2 The particle size is 20-80nm.

[0014] Preferably, chloroether resin and vinyl nano-SiO 2 The mass ratio is 2-5:1-1.2.

[0015] The main chain of chloroether resin is a saturated structure, and the side chain contains ether bonds and polar groups, which makes it have good heat aging resistance, UV aging resistance and excellent adhesion. The ether bonds in chloroether resin not only enhance the flexibility of the molecular chain, but also improve its internal plasticity, avoiding brittleness caused by plasticizer migration. Chloroether resin has good adhesion on a variety of substrates, including metals (such as aluminum, zinc, iron) and plastics (such as polyethylene, polypropylene). This is because its molecular chain contains a large number of isobutyl ether side chains, which enhance its adhesion to the substrate.

[0016] Chloroether resin has good miscibility with many other resins, solvents and plasticizers, which can improve and enhance the performance of resins. Chloroether resin can be blended with acrylate, epoxy resin, alkyd resin, etc. to form high-performance coatings and adhesives. Chloroether resin has excellent water resistance and chemical corrosion resistance, which makes it perform well in coatings and adhesives.

[0017] Preferably, the fungicide is one or more of 2-methyl-4-isothiazoline-3-one, 2-methyl-5-chloro-4-isothiazoline-3-one, 1,2-benzisothiazolin-3-one, tetradecyldimethylammonium chloride, tributyltin chloride, benzalkonium chloride and chloranil.

[0018] In a second aspect, the present invention provides a method for preparing a high-performance wall adhesive, comprising the following steps: (1) Mixing emulsion A and emulsion B according to a certain proportion, adding a fungicide during the mixing process, and the temperature is 5°C-30°C to obtain a liquid material; (2) Cement, white sand and calcium powder are mixed and stirred in proportion, and cellulose is added during the stirring process at a temperature of 5°C-30°C to obtain a powder; (3) The liquid material obtained in step (1) and the powder material obtained in step (2) are mixed and stirred evenly to obtain a high-performance wall adhesive.

[0019] Preferably, in step (1), the mass ratio of emulsion A to emulsion B is 1-2:2-3.

[0020] Preferably, in step (2), the mass ratio of cement, white sand and calcium powder is 5-9:4-6:1-3.

[0021] Nano-SiO 2It can react with acrylates to improve the weather resistance, heat resistance and friction resistance of acrylates while retaining their original advantages. The compatibility of cationic emulsion polymers and nanoparticle-modified acrylates mainly depends on the chemical structure and surface charge of the two. Cationic emulsion polymers carry a positive charge, while nanoparticle-modified acrylates carry a negative charge or a neutral charge, which promotes the compatibility of the two. The compatibility of the two can be further improved by introducing functional monomers or using specific emulsifiers.

[0022] Nano-SiO 2 The composite system of chloroether resin modified acrylate and cationic emulsion polymer achieves synergistic performance improvement through physical reinforcement, chemical bonding and electrostatic effect. It has significant application potential in the fields of anti-corrosion, construction, energy, etc.

[0023] In summary, the present invention has the following beneficial effects: 1. In the present invention, the A emulsion is a chitosan-modified cationic emulsion polymer, and the B emulsion is a nanoparticle-modified acrylic emulsion. The A emulsion and the B emulsion can synergistically enhance the waterproof performance of the high-performance wall adhesive.

[0024] 2. The chitosan in the chitosan-modified cationic emulsion polymer of the present invention is non-toxic, biodegradable and has excellent chelating properties, and has shown wide application potential in many wastewater treatment fields. Chitosan can be modified to prepare microspheres that can adsorb heavy metal ions in wastewater. In addition, chitosan can be grafted and copolymerized with other polymers to generate polymer flocculants with larger relative molecular weight and better flocculation performance. By introducing chitosan into the inverse emulsion polymerization system, the obtained grafted copolymerized cationic emulsion polymer not only has the characteristics of high relative molecular weight and narrow relative molecular weight distribution, but also shows excellent solubility. Chitosan is added to the preparation process of the cationic emulsion polymer. In this process, chitosan and cationic polyacrylamide undergo graft copolymerization reaction. At the same time, chitosan that does not participate in the graft copolymerization will form a composite flocculation system with the modified cationic emulsion polymer.

[0025] 2. The nanoparticle modified acrylic emulsion of the present invention is based on chloroether resin and vinyl nano-SiO 2 As a copolymer monomer, nanoparticles with a particle size of 1-100nm have special properties such as surface interface effect, photoelectric effect and quantum size effect, showing a series of novel physical and chemical properties, and are easy to react with emulsion or resin. The mechanical properties and stability of the resulting nanoparticle-modified acrylic adhesive are greatly improved.

[0026] 3. The high-performance wall adhesive prepared by the present invention has a thickness of only 3 mm and does not affect the size of the space. It is waterproof and does not require new bricks to be broken for waterproofing. The bonding strength of the high-performance wall adhesive is more than 6 times that of ordinary tile adhesive.

[0027] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not intended to limit the scope of protection of the present invention. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with the examples. It is particularly noted that if no specific conditions are specified in the following examples, the reactions are carried out according to conventional conditions or conditions recommended by the manufacturer. Unless otherwise specified, the raw materials used in the following examples can be obtained from common commercial sources.

[0029] Preparation Example Preparation Example 1 A chitosan-modified cationic emulsion polymer is prepared by adopting an inverse emulsion polymerization technology, using methacryloyloxyethyl trimethyl ammonium chloride, acrylamide and N,N-dimethyl acrylamide as polymerization monomers, introducing chitosan, and obtaining a modified cationic emulsion polymer; the mass ratio of chitosan to the polymerization monomer is 1:8; the mass ratio of methacryloyloxyethyl trimethyl ammonium chloride, acrylamide and N,N-dimethyl acrylamide is 3:5:3.

[0030] Preparation Example 2 A chitosan modified cationic emulsion polymer adopts the inverse emulsion polymerization technology, uses methacryloyloxyethyl trimethyl ammonium chloride, acrylamide and N,N-dimethyl acrylamide as polymerization monomers, introduces chitosan, and obtains the modified cationic emulsion polymer; the mass ratio of chitosan to the polymerization monomer is 1:5; the mass ratio of methacryloyloxyethyl trimethyl ammonium chloride, acrylamide and N,N-dimethyl acrylamide is 2:5:8.

[0031] Preparation Example 3 A nano-SiO 2 / chloroether resin modified acrylate composite emulsion, based on chloroether resin and vinyl nano-SiO 2 As comonomer, vinyl nano-SiO 2 The particle size is 55nm, chloroether resin and vinyl nano-SiO 2 The mass ratio is 3:1.

[0032] Take nano-SiO 2 The SiO with a mass fraction of 5% was prepared by ultrasonic dispersion in anhydrous ethanol. 2 Dispersion; 5% KH-570 aqueous solution was stirred and hydrolyzed at 50℃ for 5h, and after the hydrolysis was completed, SiO 2Mix well in the dispersion. Use ammonia water to adjust pH = 10, heat to 50 ° C and react for 10 hours. After the reaction is completed, filter and transfer the obtained solid to a Soxhlet extractor for 48 hours, and use acetone to elute the residual silane coupling agent. Weigh the formula amount of chloroether resin, vinyl SiO 2 and acrylic ester monomer and mix well.

[0033] Preparation Example 4 A nano-SiO 2 / chloroether resin modified acrylate composite emulsion, based on chloroether resin and vinyl nano-SiO 2 As comonomer, vinyl nano-SiO 2 The particle size is 60nm, chloroether resin and vinyl nano-SiO 2 The mass ratio is 5:1.

[0034] Take nano-SiO 2 The SiO with a mass fraction of 5% was prepared by ultrasonic dispersion in anhydrous ethanol. 2 Dispersion; 5% KH-570 aqueous solution was stirred and hydrolyzed at 50℃ for 5h, and after the hydrolysis was completed, SiO 2 Mix well in the dispersion. Use ammonia water to adjust pH = 10, heat to 50 ° C and react for 10 hours. After the reaction is completed, filter and transfer the obtained solid to a Soxhlet extractor for 48 hours, and use acetone to elute the residual silane coupling agent. Weigh the formula amount of chloroether resin, vinyl SiO 2 and acrylic ester monomer and mix well.

[0035] Example Example 1 A high-performance wall adhesive is composed of the following raw materials in parts by weight: 85 parts of A emulsion, 66 parts of B emulsion, 15 parts of cellulose, 8 parts of calcium powder, 32 parts of white sand, 21 parts of cement, and 12 parts of fungicide; Among them, emulsion A is the chitosan modified cationic emulsion polymer prepared in Preparation Example 1, and emulsion B is the nano-SiO prepared in Preparation Example 3. 2 / chloroether resin modified acrylate composite emulsion. The fungicide is 2-methyl-4-isothiazoline-3-one.

[0036] A method for preparing a high-performance wall adhesive comprises the following steps: (1) Emulsion A and emulsion B are mixed and stirred in proportion, and a fungicide is added during the stirring process. The temperature is 30°C to obtain a liquid material; the mass ratio of emulsion A to emulsion B is 1:2.

[0037] (2) Cement, white sand and calcium powder are mixed and stirred in proportion, and cellulose is added during the stirring process at a temperature of 5°C-30°C to obtain a powder; the mass ratio of cement, white sand and calcium powder is 9:6:1.

[0038] (3) The liquid material obtained in step (1) and the powder material obtained in step (2) are mixed and stirred evenly to obtain a high-performance wall adhesive.

[0039] Example 2 A high-performance wall adhesive is composed of the following raw materials in parts by weight: 95 parts of A emulsion, 88 parts of B emulsion, 22 parts of cellulose, 16 parts of calcium powder, 38 parts of white sand, 30 parts of cement, and 14 parts of fungicide; Among them, emulsion A is the chitosan modified cationic emulsion polymer prepared in Preparation Example 2, and emulsion B is the nano-SiO prepared in Preparation Example 4. 2 / chloroether resin modified acrylate composite emulsion. The fungicide is 2-methyl-4-isothiazoline-3-one.

[0040] A method for preparing a high-performance wall adhesive comprises the following steps: (1) Mix and stir emulsion A and emulsion B in proportion, add fungicide during stirring, and keep the temperature at 5°C-30°C to obtain a liquid material; the mass ratio of emulsion A to emulsion B is 1:3.

[0041] (2) Cement, white sand and calcium powder are mixed and stirred in proportion, and cellulose is added during the stirring process at a temperature of 5°C-30°C to obtain a powder; the mass ratio of cement, white sand and calcium powder is 8:5:3.

[0042] (3) The liquid material obtained in step (1) and the powder material obtained in step (2) are mixed and stirred evenly to obtain a high-performance wall adhesive.

[0043] Example 3 A high-performance wall adhesive is composed of the following raw materials in parts by weight: 98 parts of A emulsion, 75 parts of B emulsion, 32 parts of cellulose, 21 parts of calcium powder, 42 parts of white sand, 38 parts of cement, and 15 parts of fungicide; Among them, emulsion A is the chitosan modified cationic emulsion polymer prepared in Preparation Example 1, and emulsion B is the nano-SiO prepared in Preparation Example 3. 2 / chloroether resin modified acrylate composite emulsion. The fungicide is 2-methyl-4-isothiazoline-3-one.

[0044] A method for preparing a high-performance wall adhesive comprises the following steps: (1) Mix and stir emulsion A and emulsion B in proportion, add fungicide during stirring, and keep the temperature at 5°C-30°C to obtain a liquid material; the mass ratio of emulsion A to emulsion B is 1:2.

[0045] (2) Cement, white sand and calcium powder are mixed and stirred in proportion, and cellulose is added during the stirring process at a temperature of 5°C-30°C to obtain a powder; the mass ratio of cement, white sand and calcium powder is 8:6:3.

[0046] (3) The liquid material obtained in step (1) and the powder material obtained in step (2) are mixed and stirred evenly to obtain a high-performance wall adhesive.

[0047] Example 4 A high-performance wall adhesive is composed of the following raw materials in parts by weight: 102 parts of A emulsion, 98 parts of B emulsion, 40 parts of cellulose, 25 parts of calcium powder, 51 parts of white sand, 35 parts of cement, and 18 parts of fungicide; Among them, emulsion A is the chitosan modified cationic emulsion polymer prepared in Preparation Example 1, and emulsion B is the nano-SiO prepared in Preparation Example 2. 2 / chloroether resin modified acrylate composite emulsion. The fungicide is 2-methyl-4-isothiazoline-3-one.

[0048] A method for preparing a high-performance wall adhesive comprises the following steps: (1) Mix and stir emulsion A and emulsion B in proportion, add fungicide during stirring, and obtain liquid material at a temperature of 5°C-30°C; the mass ratio of emulsion A to emulsion B is 2:3.

[0049] (2) Cement, white sand and calcium powder are mixed and stirred in proportion, and cellulose is added during the stirring process at a temperature of 5°C-30°C to obtain a powder; the mass ratio of cement, white sand and calcium powder is 5:4:1.

[0050] (3) The liquid material obtained in step (1) and the powder material obtained in step (2) are mixed and stirred evenly to obtain a high-performance wall adhesive.

[0051] Comparative Example 1 The preparation was carried out in the same manner as in Example 1, except that the A emulsion chitosan-modified cationic emulsion polymer was not added.

[0052] Comparative Example 2 The same preparation method as in Example 1 was used for the preparation, except that the B latex nano-SiO 2 / Chloroether resin modified acrylate composite emulsion.

[0053] Comparative Example 3 The preparation was carried out in the same manner as in Example 1, except that no fungicide was added.

[0054] Performance Test: During construction, the high-performance wall adhesive prepared according to the embodiment and the comparative example is prepared in a ratio of material: water = 2:1, water is added first and then powder is added, and the mixture is stirred evenly with an electric drill.

[0055] The high-performance wall adhesives obtained in Examples 1-4 and Comparative Examples 1-3 of the present application were tested by curing at 25° C. for 36 hours. The test data are shown in Table 1 below.

[0056] The test method is as follows: 1. Tensile shear strength test method: GB / T7124-2008 Determination of tensile shear strength of adhesives (rigid material to rigid material).

[0057] 2. Positive tensile bond strength test method: GBT6329-1996-Determination of tensile strength of adhesive butt joints.

[0058] 3. Elongation at break test method: GB-T2568-1995 Test method for tensile properties of resin castings.

[0059] Table 1 Performance test results

[0060] It can be seen from Table 1 that the tensile shear strength of the products obtained in Examples 1-4 is 11.8-12.5 MPa, and the positive tensile bonding strength is 16.9-17.6 MPa. Compared with Comparative Examples 1-3, they not only have better mechanical strength but also have anti-corrosion and waterproof properties.

[0061] The high-performance wall adhesive prepared by the present invention has a paving thickness of only 3 mm and does not affect the size of the space. It has waterproof performance and does not require new bricks to be broken for waterproofing. The bonding strength of the high-performance wall adhesive is more than 6 times that of ordinary tile adhesive.

[0062] The above is only an exemplary embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A high-performance wall adhesive, characterized in that: It is composed of the following raw materials in parts by weight: 85-102 parts of A emulsion, 66-98 parts of B emulsion, 15-40 parts of cellulose, 8-25 parts of calcium powder, 32-51 parts of white sand, 21-35 parts of cement, and 12-18 parts of fungicide; Among them, emulsion A is a chitosan-modified cationic emulsion polymer, and emulsion B is a nanoparticle-modified acrylic emulsion.

2. The high-performance wall adhesive according to claim 1, characterized in that: It is composed of the following raw materials in parts by weight: 92-100 parts of A emulsion, 75-98 parts of B emulsion, 15-32 parts of cellulose, 8-21 parts of calcium powder, 35-45 parts of white sand, 25-30 parts of cement, and 12-18 parts of fungicide.

3. The high-performance wall adhesive according to claim 1, characterized in that: Chitosan modified cationic emulsion polymer adopts reverse emulsion polymerization technology, uses methacryloyloxyethyl trimethyl ammonium chloride, acrylamide and N, N-dimethyl acrylamide as polymerization monomers, introduces chitosan, and obtains the modified cationic emulsion polymer; the mass ratio of chitosan to polymerization monomer is 1-3:5-8.

4. The high-performance wall adhesive according to claim 1, characterized in that: The mass ratio of methacryloyloxyethyl trimethylammonium chloride, acrylamide and N,N-dimethylacrylamide is 2-3:1.2-5:1-8.

5. The high-performance wall adhesive according to claim 1, characterized in that: Nanoparticle modified acrylic ester emulsion uses chloroether resin and vinyl nano-SiO2 as copolymer monomers to prepare nano-SiO2 / chloroether resin modified acrylic ester composite emulsion; the particle size of vinyl nano-SiO2 is 20-80nm.

6. The high-performance wall adhesive according to claim 1, characterized in that: The mass ratio of the chloroether resin to the vinyl nano-SiO2 is 2-5:1-1.

2.

7. The high-performance wall adhesive according to claim 1, characterized in that: The fungicide is one or more of 2-methyl-4-isothiazoline-3-one, 2-methyl-5-chloro-4-isothiazoline-3-one, 1,2-benzisothiazolin-3-one, tetradecyldimethylammonium chloride, tributyltin chloride, benzalkonium chloride and chloranil.

8. The method for preparing the high-performance wall adhesive according to any one of claims 1 to 7, characterized in that: The following steps are involved: (1) Mixing emulsion A and emulsion B according to a certain proportion, adding a fungicide during the mixing process, and the temperature is 5°C-30°C to obtain a liquid material; (2) Cement, white sand and calcium powder are mixed and stirred in proportion, and cellulose is added during the mixing process at a temperature of 5°C-30°C to obtain a powder; (3) The liquid material obtained in step (1) and the powder material obtained in step (2) are mixed and stirred evenly to obtain a high-performance wall adhesive.

9. The method for preparing the high-performance wall adhesive according to claim 8, characterized in that: In step (1), the mass ratio of emulsion A to emulsion B is 1-2:2-3.

10. The method for preparing the high-performance wall adhesive according to claim 8, characterized in that: In step (2), the mass ratio of cement, white sand and calcium powder is 5-9:4-6:1-3.

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