Polymer cement waterproof coating and preparation method thereof

Abstract

The invention relates to a polymer cement waterproof coating and a preparation method thereof, and belongs to the technical field of building coatings. According to the invention, through copolymerization of acrylate and butadiene, not only is good waterproof performance provided, but also durability and stability of the coating are enhanced; by reasonably matching the fillers with different particle sizes, more compact particle accumulation is formed, and pores are reduced; and by combining the advantages of isopropyl triethoxy silane and fluorinated acrylate, the watertightness of the waterproof coating is further enhanced.

Description

Technical Field

[0001] The invention belongs to the technical field of building coatings and relates to a polymer cement waterproof coating and a preparation method thereof. Background Art

[0002] In the field of construction and engineering, the application of waterproof coatings is crucial. With the acceleration of urbanization, the waterproof performance of buildings directly affects their durability and service life. Although traditional waterproof materials such as asphalt membranes and polyurethane coatings have solved the waterproofing problem to a certain extent, they also have some limitations, such as leakage problems at joints and the need to be constructed under dry conditions. Therefore, the market demand for more environmentally friendly, easy-to-construct and excellent performance waterproof materials is growing. Polymer cement waterproof coatings came into being. It combines the advantages of organic and inorganic materials. With its excellent performance and wide applicability, it has become an important choice in modern building waterproofing projects.

[0003] Polymer cement waterproof coating is a two-component waterproof coating composed of polymer emulsion (such as acrylic emulsion) and inorganic powder (such as cement). The advantages of polymer cement waterproof coating are significant: first, it has excellent elasticity and adhesion, and can adapt to the slight deformation of the building without cracking; second, it has good environmental performance, does not contain organic solvents, and meets the requirements of modern green buildings; in addition, polymer cement waterproof coating is easy to apply and can be applied directly on a damp base surface, shortening the construction period and improving construction efficiency.

[0004] Chinese patent document CN113388276A discloses a polymer cement waterproof coating and a preparation method of the polymer cement waterproof coating, which is composed of the following components in parts by weight, wherein the powder comprises: 40-50 parts of silicate cement, 1-3 parts of calcium aluminate, 1-2 parts of gypsum, 5-10 parts of quartz sand, 10-15 parts of quartz powder, 17.6-42 parts of heavy calcium; 0.2-0.5 parts of water reducing agent, 0.2-0.3 parts of dry powder defoaming agent, and 0-1.7 parts of anti-cracking material; the liquid comprises a polymer emulsion, an additive and water, and the obtained waterproof coating has an elongation at break of 87-125%. Summary of the invention

[0005] The present invention relates to a polymer cement waterproof coating, a preparation method and an application, and belongs to the technical field of architectural coatings. The present invention not only provides good waterproof performance through copolymerization of acrylate and butadiene, but also enhances the durability and stability of the coating; by reasonably matching fillers of different particle sizes, a tighter particle stacking is formed to reduce pores; and by combining the advantages of isopropyl triethoxysilane and fluorinated acrylate, the impermeability of the waterproof coating is further enhanced.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A polymer cement waterproof coating comprises a liquid material and a powder material; wherein the liquid material is composed of the following raw materials in parts by weight: 100-200 parts by weight of a polymer emulsion, 2-10 parts by weight of a thickener, 2-8 parts by weight of a waterproofing agent, 0.5-2 parts by weight of a defoaming agent and 2-8 parts by weight of a bactericide; and the powder material is composed of the following raw materials in parts by weight: 50-80 parts by weight of cement, 50-150 parts by weight of a composite filler and 1-10 parts by weight of a water reducing agent.

[0008] As a preferred technical solution of the present invention, the polymer emulsion is an acrylate-butadiene copolymer emulsion, the thickener is a cellulose ether, the defoamer is any one of a silicone defoamer, a mineral oil defoamer, and a polyether defoamer, and the bactericide is methylisothiazolinone and sodium benzoate.

[0009] As a preferred technical solution of the present invention, the waterproofing agent is isopropyl triethoxysilane and fluorinated acrylate, and the mass ratio of the isopropyl triethoxysilane to the fluorinated acrylate is 1:0.5-2.

[0010] As a preferred technical solution of the present invention, the preparation method of the acrylate-butadiene copolymer emulsion is: deionized water, an emulsifier and an initiator are mixed to form a stable emulsion system; acrylate, butadiene and a cross-linking agent are evenly mixed to form a monomer mixture; the monomer mixture is added dropwise to the emulsion system, stirred at 50-80°C for 4-8 hours to carry out a polymerization reaction, and a terminator is added to terminate the polymerization reaction to obtain a polymer emulsion.

[0011] As a preferred technical solution of the present invention, the acrylate is methyl acrylate or butyl acrylate, the emulsifier is sodium dodecyl sulfate, the initiator is potassium persulfate, the cross-linking agent is divinylbenzene, the terminator is hydroquinone or sodium bisulfite, and the mass ratio of the deionized water, acrylate, butadiene, initiator, emulsifier, cross-linking agent and terminator is 100:60-70:30-40:0.1-1:1-5:1-10:0.02-1.

[0012] As a preferred technical solution of the present invention, the composite filler is: large particle filler quartz sand, medium and small particle filler talcum powder and fine particle filler nano silicon dioxide; the large particle filler is 20-60 mesh, the small and medium particle filler has a particle size of 10-50 μm, and the fine particle filler has a particle size of 20-80 nm; the mass ratio of the large particle filler, the medium and small particle filler and the fine particle filler is 3-4:4-5:1-2.

[0013] As a preferred technical solution of the present invention, the water reducer is at least one of a naphthalene-based water reducer, a polycarboxylic acid water reducer, and an aliphatic water reducer.

[0014] Furthermore, the preparation method of the polymer cement waterproof coating comprises the following steps:

[0015] (1) Liquid material preparation: Add the polymer emulsion and defoamer into a stirring container, stir for 10-20 minutes, add the thickener, bactericide and waterproofing agent, stir for 20-30 minutes, and filter the material with a 100-mesh filter to obtain a liquid material;

[0016] (2) Preparation of powder: Mix cement, filler and water reducing agent evenly to obtain powder;

[0017] (3) The liquid material and the powder material are mixed evenly to obtain a polymer cement waterproof coating.

[0018] Beneficial effects of the present invention:

[0019] (1) The present invention not only provides good waterproof performance through the copolymerization of acrylate and butadiene, but also enhances the durability and stability of the coating. The polar group acrylate can produce strong physical and chemical bonding with the surface of the substrate, thereby improving the bonding strength; the rubber property of the butadiene part enables the coating to maintain elasticity when the temperature changes or the substrate moves slightly, thereby preventing cracking; during the film forming process, a dense three-dimensional network structure is formed through a cross-linking reaction, giving the coating good mechanical strength and wear resistance, while maintaining a certain degree of flexibility. Its dense cross-linked network can effectively prevent the penetration of water and other liquids, thereby ensuring the waterproof effect of the coating.

[0020] (2) By properly matching fillers of different particle sizes, a tighter particle stacking is formed to reduce porosity. Fillers of different particle sizes can fill each other, and smaller particles fill the gaps between larger particles to form a denser structure. This dense particle stacking reduces the porosity in the coating, thereby reducing the penetration path of water and other liquids and enhancing the waterproof performance.

[0021] (3) Combining the advantages of isopropyl triethoxysilane and fluorinated acrylate, the waterproof coating is further enhanced in its impermeability. Isopropyl triethoxysilane has good hydrophobicity and can form a protective film on the surface to effectively prevent water penetration. Despite its waterproof properties, isopropyl triethoxysilane still maintains a certain air permeability, allowing water vapor to pass through; fluorinated acrylate has extremely low surface energy, giving the material excellent waterproof and oil-proof properties, which can effectively resist the penetration of water, oil and other liquids, and has excellent resistance to a variety of chemicals, including acids, alkalis and solvents. In addition, the surface characteristics of fluorinated acrylate make it difficult for dirt and pollutants to adhere, making it easy to clean and maintain. DETAILED DESCRIPTION

[0022] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with the embodiments.

[0023] In the following examples and comparative examples, the cellulose ether was purchased from Langfang Feitai New Materials Technology Co., Ltd. with the item number 0056; the silicone defoamer was purchased from Defeng Defoamer Co., Ltd. with the item number DF-044; the mineral oil defoamer was purchased from Guozhong New Materials Research Institute with the item number XP-502E; isopropyl triethoxysilane was purchased from Suzhou Siso New Materials Co., Ltd.; the naphthalene-based water reducer was purchased from Shandong Chengshun Chemical Technology Co., Ltd. with the item number 01; the polycarboxylic acid water reducer was purchased from Gaochuang Hengda New Building Materials Technology Co., Ltd. with the item number 2001; the polyacrylate emulsion was purchased from Delun New Materials Co., Ltd. with the model number E04; the fluorinated acrylate was purchased from Chengdu Boshen High-Tech Materials Development Co., Ltd.; and the cement was purchased from Guangzhou Yaowei Building Materials Co., Ltd., and the type was sulphoaluminate cement.

[0024] Example 1

[0025] A polymer cement waterproof coating comprises a liquid material and a powder material; wherein the liquid material is composed of the following raw materials in parts by weight: 200 parts by weight of a polymer emulsion, 5 parts by weight of a thickener, 6 parts by weight of a waterproofing agent, 1 part by weight of a defoaming agent and 6 parts by weight of a bactericide; and the powder material is composed of the following raw materials in parts by weight: 60 parts by weight of cement, 100 parts by weight of a composite filler and 6 parts by weight of a water reducing agent.

[0026] The polymer emulsion is an acrylate-butadiene copolymer emulsion, the thickener is cellulose ether, the defoamer is a silicone defoamer, and the bactericide is methylisothiazolinone and sodium benzoate.

[0027] The mass ratio of the methylisothiazolinone to sodium benzoate is 1:5.

[0028] The waterproofing agent is isopropyl triethoxysilane and fluorinated acrylate, and the mass ratio of the isopropyl triethoxysilane to the fluorinated acrylate is 1:1.5.

[0029] The preparation method of the acrylate-butadiene copolymer emulsion is as follows: deionized water, an emulsifier and an initiator are mixed to form a stable emulsion system; acrylate, butadiene and a crosslinking agent are evenly mixed to form a monomer mixture; the monomer mixture is added dropwise to the emulsion system, stirred at 60° C. for 6 hours to perform a polymerization reaction, and a terminator is added to terminate the polymerization reaction to obtain a polymer emulsion.

[0030] The acrylate is methyl acrylate, the emulsifier is sodium dodecyl sulfate, the initiator is potassium persulfate, the crosslinker is divinylbenzene, the terminator is hydroquinone, and the mass ratio of deionized water, acrylate, butadiene, initiator, emulsifier, crosslinker and terminator is 100:60:30:0.5:2:4:0.5.

[0031] The composite filler is: large particle filler quartz sand, medium and small particle filler talcum powder and fine particle filler nano silicon dioxide; the large particle filler is 40 mesh, the small and medium particle filler has a particle size of 40 μm, and the fine particle filler has a particle size of 50 nm; the mass ratio of the large particle filler, the medium and small particle filler and the fine particle filler is 3:4:1.

[0032] The water reducer is a naphthalene-based water reducer.

[0033] The preparation method of the polymer cement waterproof coating comprises the following steps:

[0034] (1) Liquid material preparation: Add the polymer emulsion and defoamer into a stirring container, stir for 15 minutes, then add the thickener, fungicide and waterproofing agent and stir for 25 minutes, filter the material with a 100-mesh filter to obtain a liquid material;

[0035] (2) Preparation of powder: Mix cement, filler and water reducing agent evenly to obtain powder;

[0036] (3) The liquid material and the powder material are mixed evenly to obtain a polymer cement waterproof coating.

[0037] Example 2

[0038] A polymer cement waterproof coating comprises a liquid material and a powder material; wherein the liquid material is composed of the following raw materials in parts by weight: 150 parts by weight of a polymer emulsion, 2 parts by weight of a thickener, 2 parts by weight of a waterproofing agent, 0.5 parts by weight of a defoaming agent and 2 parts by weight of a bactericide; and the powder material is composed of the following raw materials in parts by weight: 50 parts by weight of cement, 100 parts by weight of a composite filler and 2 parts by weight of a water reducing agent.

[0039] The polymer emulsion is an acrylate-butadiene copolymer emulsion, the thickener is cellulose ether, the defoamer is a mineral oil defoamer, and the bactericide is methylisothiazolinone and sodium benzoate.

[0040] The mass ratio of the methylisothiazolinone to sodium benzoate is 1:5.

[0041] The waterproofing agent is isopropyl triethoxysilane and fluorinated acrylate, and the mass ratio of the isopropyl triethoxysilane to the fluorinated acrylate is 1:2.

[0042] The preparation method of the acrylate-butadiene copolymer emulsion is as follows: deionized water, an emulsifier and an initiator are mixed to form a stable emulsion system; acrylate, butadiene and a crosslinking agent are evenly mixed to form a monomer mixture; the monomer mixture is added dropwise to the emulsion system, stirred at 80° C. for 4 hours to perform a polymerization reaction, and a terminator is added to terminate the polymerization reaction to obtain a polymer emulsion.

[0043] The acrylate is butyl acrylate, the emulsifier is sodium dodecyl sulfate, the initiator is potassium persulfate, the crosslinker is divinylbenzene, the terminator is sodium bisulfite, and the mass ratio of deionized water, acrylate, butadiene, initiator, emulsifier, crosslinker and terminator is 100:70:40:1:5:10:1.

[0044] The composite filler is: large particle filler quartz sand, medium and small particle filler talcum powder and fine particle filler nano silicon dioxide; the large particle filler is 60 mesh, the small and medium particle filler has a particle size of 40 μm, and the fine particle filler has a particle size of 50 nm; the mass ratio of the large particle filler, the medium and small particle filler and the fine particle filler is 4:5:2.

[0045] The water reducer is a polycarboxylate water reducer.

[0046] The preparation method of the polymer cement waterproof coating comprises the following steps:

[0047] (1) Liquid material preparation: Add the polymer emulsion and defoamer into a stirring container, stir for 20 minutes, then add the thickener, bactericide and waterproofing agent and stir for 20 minutes, filter the material with a 100-mesh filter to obtain a liquid material;

[0048] (2) Preparation of powder: Mix cement, filler and water reducing agent evenly to obtain powder;

[0049] (3) The liquid material and the powder material are mixed evenly to obtain a polymer cement waterproof coating.

[0050] Comparative Example 1

[0051] On the basis of Example 1, the polymer emulsion used was polyacrylate emulsion, and the rest was consistent with Example 1.

[0052] Comparative Example 2

[0053] On the basis of Example 1, no large particle filler is added to the composite filler, the mass ratio of small and medium particle filler to fine particle filler is changed to 7:1, and the rest is consistent with Example 1.

[0054] Comparative Example 3

[0055] On the basis of Example 1, no small or medium particle filler is added to the composite filler, the mass ratio of large particle filler to fine particle filler is changed to 3:5, and the rest is consistent with Example 1.

[0056] Comparative Example 4

[0057] On the basis of Example 1, no fine particle filler is added to the composite filler, the mass ratio of large particle filler to medium and small particle filler is changed to 4:4, and the rest is consistent with Example 1.

[0058] Comparative Example 5

[0059] On the basis of Example 1, only isopropyltriethoxysilane was added to the waterproofing agent, and the rest was consistent with Example 1.

[0060] Comparative Example 6

[0061] On the basis of Example 1, only fluorinated acrylate is added as the waterproofing agent, and the rest is consistent with Example 1.

[0062] Performance Test:

[0063] The elongation at break and water impermeability of the polymer cement waterproof coatings prepared in Examples 1-2 and Comparative Examples 1-6 were tested with reference to the test methods and testing requirements specified in the standard GB / T23445-2009. The test results are shown in the table.

[0064]

[0065] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any indirect modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A polymer cement waterproof coating, characterized in that: Contains liquid and powder; The liquid material is composed of the following raw materials in parts by weight: 100-200 parts by weight of polymer emulsion, 2-10 parts by weight of thickener, 2-8 parts by weight of waterproofing agent, 0.5-2 parts by weight of defoaming agent and 2-8 parts by weight of bactericide; the powder material is composed of the following raw materials in parts by weight: 50-80 parts by weight of cement, 50-150 parts by weight of composite filler and 1-10 parts by weight of water reducing agent.

2. A polymer cement waterproof coating according to claim 1, characterized in that: The polymer emulsion is an acrylate-butadiene copolymer emulsion, the thickener is cellulose ether, the defoamer is any one of a silicone defoamer, a mineral oil defoamer and a polyether defoamer, and the bactericide is methylisothiazolinone and sodium benzoate.

3. The polymer cement waterproof coating according to claim 1, characterized in that: The waterproofing agent is isopropyl triethoxysilane and fluorinated acrylate, and the mass ratio of the isopropyl triethoxysilane to the fluorinated acrylate is 1:0.5-2.

4. The polymer cement waterproof coating according to claim 2, characterized in that: The preparation method of the acrylate-butadiene copolymer emulsion is as follows: deionized water, an emulsifier and an initiator are mixed to form a stable emulsion system; acrylate, butadiene and a crosslinking agent are evenly mixed to form a monomer mixture; the monomer mixture is added dropwise to the emulsion system, stirred at 50-80° C. for 4-8 hours to perform a polymerization reaction, and a terminator is added to terminate the polymerization reaction to obtain a polymer emulsion.

5. A polymer cement waterproof coating according to claim 4, characterized in that: The acrylate is methyl acrylate or butyl acrylate, the emulsifier is sodium dodecyl sulfate, the initiator is potassium persulfate, the crosslinker is divinylbenzene, the terminator is hydroquinone or sodium bisulfite, and the mass ratio of the deionized water, acrylate, butadiene, initiator, emulsifier, crosslinker and terminator is 100:60-70:30-40:0.1-1:1-5:1-10:0.02-1.

6. The polymer cement waterproof coating according to claim 1, characterized in that: The composite filler is: large particle filler quartz sand, medium and small particle filler talcum powder and fine particle filler nano silicon dioxide; the large particle filler is 20-60 mesh, the small and medium particle filler has a particle size of 10-50 μm, and the fine particle filler has a particle size of 20-80 nm; the mass ratio of the large particle filler, the medium and small particle filler and the fine particle filler is 3-4:4-5:1-2.

7. The polymer cement waterproof coating according to claim 1, characterized in that: The water reducer is at least one of a naphthalene-based water reducer, a polycarboxylic acid water reducer, and an aliphatic water reducer.

8. A method for preparing the polymer cement waterproof coating according to any one of claims 1 to 7, characterized in that: The following steps are involved: (1) Liquid material preparation: Add the polymer emulsion and defoamer into a stirring container, stir for 10-20 minutes, add the thickener, bactericide and waterproofing agent, stir for 20-30 minutes, and filter the material with a 100-mesh filter to obtain a liquid material; (2) Preparation of powder: Mix cement, filler and water reducing agent evenly to obtain powder; (3) The liquid material and the powder material are mixed evenly to obtain a polymer cement waterproof coating.

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