Polymer-based anti-seepage alkali-resistant slurry and preparation method thereof

Abstract

The invention relates to the technical field of waterproof slurry, and discloses polymer-based anti-seepage alkali-resistant slurry and a preparation method thereof.The polymer-based anti-seepage alkali-resistant slurry is prepared from, by weight, 300-350 parts of styrene-butadiene emulsion, 50-100 parts of acrylic emulsion, 6-10 parts of acrylic acid dispersing agent, 6-10 parts of 2-methacryloyloxyethyl phosphorylcholine and 200-300 parts of filler. 1-3 parts of a coalescing agent, 0.5-2 parts of an initiator, 0.5-2 parts of sodium hydroxide and 200 parts of water; the filler comprises coarse whiting, precipitated barium sulfate and pseudo-boehmite. The styrene-butadiene emulsion and the acrylic emulsion are compounded, the filler is used for filling, and the initiator is used for crosslinking, so that the compounded slurry has good flexibility, flexural and compressive strength and bonding performance at the same time, a waterproof layer is denser, seepage and alkali resistance is better, operation is safe, and construction is convenient.

Description

Technical Field

[0001] The invention relates to the technical field of waterproof slurry, and in particular to a polymer-based anti-seepage and anti-alkali slurry and a preparation method thereof. Background Art

[0002] The quality engineering problems of buildings are closely related to waterproof and moisture-proof problems, including the waterproof and moisture-proof problems of basements of various buildings, the waterproof problems at the interfaces of various finishing materials, and the waterproof and mildew-proof problems on the surfaces of various internal and external wall decoration materials. At present, waterproof mortar materials are commonly used for surface protection and interface reinforcement. After application, it will not damage the original wall surface, but has a good waterproof and moisture-proof effect.

[0003] Butadiene-styrene emulsion is obtained by copolymerization of butadiene and styrene emulsion. It is very stable under alkaline conditions and will not hydrolyze. Therefore, butadiene-styrene waterproof mortar emulsion has good water resistance, alkali resistance and rigidity, and has good bonding strength, compressive and flexural strength, compatibility with cement and adhesion, but poor flexibility. Acrylic emulsion is an emulsion copolymerized from pure acrylic ester monomers. Since the ester group of acrylic ester monomer will hydrolyze under strong alkaline conditions, it has poor water resistance and alkali resistance, but better flexibility than butadiene-styrene emulsion. Therefore, it is difficult for the existing two polymer-based waterproof mortar emulsions to simultaneously achieve the comprehensive properties of flexibility, flexural and compressive strength, bonding strength and acid and alkali resistance, and it is difficult to meet market needs.

[0004] The Chinese invention patent with publication number CN 111138600 B discloses a styrene-modified zero-ammonia acrylic waterproof mortar emulsion, a preparation method thereof, and a waterproof mortar, wherein the waterproof mortar emulsion comprises 100 parts of deionized water, 25-35 parts of styrene, 50-60 parts of butyl acrylate, 1-5 parts of hydroxyethyl acrylate, 1-3 parts of hydroxyethyl methacrylate, 0.5-3 parts of methacrylic acid, 0.1-0.5 parts of allyl methacrylate, 0.1-0.5 parts of silane coupling agent, 55-65 parts of styrene-butadiene emulsion, 1-10 parts of emulsifier, 0.1-1 parts of initiator, and 0.1-2 parts of sodium hydroxide. However, the waterproof mortar emulsion has poor flexural and compressive strength due to the addition of a high proportion of acrylic emulsion, and a large number of ester groups contained in it will be hydrolyzed under strong alkaline conditions, and the water and alkali resistance is poor. Summary of the invention

[0005] In order to solve the above-mentioned technical problems, the present invention provides a polymer-based anti-seepage and anti-alkali slurry and a preparation method thereof. By compounding butadiene-styrene emulsion and acrylic emulsion, and adding dispersants, fillers, additives, etc., a waterproof layer with better flexural and compressive strength, flexibility and bonding strength can be obtained under the synergistic effect. At the same time, it has good water and alkali resistance and is suitable for surface protection and waterproof reinforcement of various buildings.

[0006] The purpose of the present invention is achieved through the following technical solutions: In the first aspect, the present invention provides a polymer-based anti-seepage and anti-alkali slurry, which includes the following raw material components in parts by weight: 300-350 parts of styrene-butadiene emulsion, 50-100 parts of acrylic emulsion, 6-10 parts of acrylic dispersant, 6-10 parts of 2-methacryloyloxyethyl phosphorylcholine, 200-300 parts of filler, 1-3 parts of film-forming aid, 0.5-2 parts of initiator, 0.5-2 parts of sodium hydroxide and 200 parts of water; the filler includes heavy calcium, precipitated barium sulfate and pseudo-boehmite.

[0007] The present invention can make the compounded slurry have good flexibility, rigidity and bonding performance at the same time by compounding styrene butadiene emulsion and acrylic emulsion, and even if there is an ester group in the acrylic emulsion, the waterproof and alkali resistance of the cement waterproof mortar is still good under strong alkaline conditions for a long time due to the large content ratio of styrene butadiene emulsion. The addition of fillers can play a good filling role, making the waterproof layer more compact, so that the flexural and compressive strengths are better. Moreover, the filler is compounded by heavy calcium, precipitated barium sulfate and pseudo-boehmite, and different materials, masses and particle size ratios can make the filler play a better filling effect, and the added 2-methacryloyloxyethyl phosphorylcholine carries positive and negative heterogeneous charges at the same time, has better compatible adsorption with the filler component, and has strong water-binding ability and hydrophilicity, and the pseudo-boehmite in the filler can also combine with water to form a sol to play a better bonding role. In addition, some double bonds in acrylic dispersants, 2-methacryloyloxyethyl phosphorylcholine and styrene butadiene emulsion can be cross-linked under the action of an initiator, increasing the proportion of flexible segments and improving flexibility to a certain extent. In addition, the combination of various components under the synergistic effect is better, and the dispersion uniformity is also better. The slurry formula in the present invention can have better crack resistance during the waterproof layer molding process, the material does not dry out, and the repeated brushing is better, thereby obtaining better flexural and compressive strength, flexibility and bonding strength.

[0008] Preferably, the filler comprises heavy calcium sulfate, precipitated barium sulfate and pseudo-boehmite in a weight ratio of 10:1:1.

[0009] Preferably, the particle size of the heavy calcium is 200-500 mesh; the particle size of the precipitated barium sulfate is 1250-3000 mesh; and the particle size of the pseudo-boehmite is not greater than 10 nm.

[0010] The ratio of different materials, masses and particle sizes can make the filler play a better filling effect, and the particle size of pseudo-boehmite is the smallest and can play a bonding role, so the filler can play a better filling effect and the structural stability is also higher.

[0011] Preferably, the solid content of the styrene-butadiene emulsion is 45-50%, and the viscosity is 100-200 mPa·s.

[0012] Preferably, the acrylic emulsion has a solid content of 55-60% and a viscosity of 300-500 mPa·s.

[0013] The compounding of styrene-butadiene emulsion and acrylic emulsion under the limited conditions can better balance flexibility and flexural and compressive strength, and exert better comprehensive performance effects.

[0014] Preferably, the acrylic dispersant includes one or more of acrylic acid, methacrylic acid and 2-ethylacrylic acid.

[0015] Preferably, the film-forming aid is 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate.

[0016] Preferably, the initiator is sodium persulfate, potassium persulfate or ammonium persulfate.

[0017] Preferably, the following raw material components are also included, by weight: 1 to 3 parts of defoaming agent and 0.1 to 1 part of bactericide.

[0018] Preferably, the defoamer is a silicone defoamer.

[0019] Preferably, the fungicide is an isothiazolinone fungicide.

[0020] In a second aspect, the present invention further provides a method for preparing a polymer-based anti-seepage and anti-alkali slurry, comprising the following steps: (1) mixing an acrylic dispersant, a defoaming agent, and 80 to 90% by weight of water to obtain a first solution; (2) mixing the initiator and the remaining weight portion of water to obtain an initiator solution; (3) adding styrene butadiene emulsion, acrylic emulsion, 2-methacryloyloxyethyl phosphorylcholine, precipitated barium sulfate and pseudo-boehmite to the first solution and stirring and mixing, then adding 70-80% by weight of the initiator solution, stirring at a low speed and heating to 70-80° C. to react for 60-90 minutes; (4) adding heavy calcium and the remaining weight portion of the initiator solution, stirring at high speed and maintaining the temperature at 70-80° C. for 10-20 minutes; (5) after cooling, adding a bactericide and a film-forming aid, adding sodium hydroxide to adjust the pH to 7-9, stirring for 30-60 minutes, filtering the material, and obtaining a polymer-based anti-seepage and anti-alkali slurry.

[0021] Preferably, in step (3), the speed of low-speed stirring is 100 to 150 r / min.

[0022] Preferably, in step (4), the speed of high-speed stirring is 200 to 300 r / min.

[0023] Compared with the prior art, the present invention has the following beneficial effects: (1) By compounding styrene-butadiene emulsion and acrylic emulsion, the compound slurry can have good flexibility, rigidity and bonding properties at the same time, and the waterproof and alkali resistance of cement waterproof mortar is good; (2) The filler can play a good filling role by compounding heavy calcium, precipitated barium sulfate and pseudo-boehmite, making the waterproof layer more compact, thus improving the flexural and compressive strength; (3) The addition of 2-methacryloyloxyethyl phosphorylcholine can improve the compatibility and adsorption with the filler component, while having a strong ability to bind water and hydrophilic properties. In addition, the synergistic cross-linking with other components increases the proportion of flexible segments, improves the binding between the components, and improves the dispersion uniformity.

[0024] (4) The polymer-based anti-seepage and anti-alkali slurry obtained by the present invention has good environmental protection, safe operation, convenient construction, and excellent bonding performance with structural bases and various building materials. DETAILED DESCRIPTION

[0025] The technical solution of the present invention is described below with specific embodiments, but the protection scope of the present invention is not limited thereto: The polymer-based anti-seepage and anti-alkali slurry comprises the following raw material components by weight: 300-350 parts of styrene-butadiene emulsion, 50-100 parts of acrylic emulsion, 6-10 parts of acrylic dispersant, 6-10 parts of 2-methacryloyloxyethyl phosphorylcholine, 200-300 parts of filler, 1-3 parts of film-forming aid, 0.5-2 parts of initiator, 0.5-2 parts of sodium hydroxide, 1-3 parts of defoaming agent, 0.1-1 part of bactericide, and 200 parts of water.

[0026] The solid content of the styrene-butadiene emulsion is 45-50%, and the viscosity is 100-200 mPa·s.

[0027] The solid content of the acrylic emulsion is 55-60%, and the viscosity is 300-500 mPa·s.

[0028] The acrylic dispersant includes one or more of acrylic acid, methacrylic acid and 2-ethylacrylic acid.

[0029] The filler comprises heavy calcium, precipitated barium sulfate and pseudo-boehmite in a weight ratio of 10:1:1. The particle size of heavy calcium is 200-500 meshes, the particle size of precipitated barium sulfate is 1250-3000 meshes, and the particle size of pseudo-boehmite is not greater than 10nm.

[0030] The film-forming aid is 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate.

[0031] The initiator is sodium persulfate, potassium persulfate or ammonium persulfate.

[0032] The defoaming agent is a silicone defoaming agent.

[0033] The fungicide is an isothiazolinone fungicide.

[0034] The preparation of the above-mentioned polymer-based anti-seepage and anti-alkali slurry comprises the following steps: (1) mixing an acrylic dispersant, a defoaming agent, and 80 to 90% by weight of water to obtain a first solution; (2) mixing the initiator and the remaining weight portion of water to obtain an initiator solution; (3) adding styrene butadiene emulsion, acrylic emulsion, 2-methacryloyloxyethyl phosphorylcholine, precipitated barium sulfate and pseudo-boehmite to the first solution and stirring and mixing, then adding 70-80% by weight of the initiator solution, stirring at a low speed of 100-150 r / min, and heating to 70-80° C. to react for 60-90 min; (4) adding heavy calcium and the remaining weight of the initiator solution, stirring at a speed of 200 to 300 r / min, and maintaining the temperature at 70 to 80° C. for 10 to 20 minutes; (5) After cooling, add a fungicide and a film-forming aid, add sodium hydroxide to adjust the pH to 7-9, stir for 30-60 minutes, filter the material, and obtain a polymer-based anti-seepage and anti-alkali slurry.

[0035] Example 1 The polymer-based anti-seepage and anti-alkali slurry comprises the following raw material components by weight: 300 parts of styrene-butadiene emulsion (C3615, solid content of 49%, viscosity of 200mPa·s), 100 parts of acrylic emulsion (S400, solid content of 57%, viscosity of 400mPa·s), 8 parts of acrylic dispersant (methacrylic acid), 8 parts of 2-methacryloyloxyethyl phosphorylcholine, 250 parts of filler, 1.5 parts of film-forming aid (2,2,4-trimethyl-1,3-pentanediol monoisobutyrate), 1 part of initiator (potassium persulfate), 1.2 parts of sodium hydroxide, 2 parts of defoamer (silicone defoamer MSD-916), 0.4 parts of bactericide (isothiazolinone), and 200 parts of water.

[0036] The filler includes heavy calcium, precipitated barium sulfate and pseudo-boehmite in a weight ratio of 10:1:1. The particle size of heavy calcium is 500 mesh, the particle size of precipitated barium sulfate is 3000 mesh, and the average particle size of pseudo-boehmite is 10nm.

[0037] The preparation of the above-mentioned polymer-based anti-seepage and anti-alkali slurry comprises the following steps: (1) mixing an acrylic dispersant, a defoaming agent, and 80% by weight of water to obtain a first solution; (2) mixing the initiator and the remaining 20% ​​by weight of water to obtain an initiator solution; (3) adding styrene butadiene emulsion, acrylic emulsion, 2-methacryloyloxyethyl phosphorylcholine, precipitated barium sulfate and pseudo-boehmite to the first solution and stirring and mixing, then adding 70% by weight of the initiator solution, stirring at a low speed of 150 r / min, and heating to 70° C. for reaction for 90 min; (4) adding heavy calcium and the remaining 30% by weight of the initiator solution, stirring at a high speed of 250 r / min, and maintaining the temperature at 80° C. for 15 min; (5) After cooling, a fungicide and a film-forming aid are added, sodium hydroxide is added to adjust the pH to 8-9, the mixture is stirred for 50 minutes, and the material is filtered to obtain a polymer-based anti-seepage and anti-alkali slurry.

[0038] Example 2 The polymer-based anti-seepage and anti-alkali slurry comprises the following raw material components by weight: 350 parts of styrene-butadiene emulsion (C3615, solid content of 49%, viscosity of 200 mPa·s), 50 parts of acrylic emulsion (S400, solid content of 57%, viscosity of 400 mPa·s), 6 parts of acrylic dispersant (methacrylic acid), 6 parts of 2-methacryloyloxyethyl phosphorylcholine, 200 parts of filler, 1 part of film-forming aid (2,2,4-trimethyl-1,3-pentanediol monoisobutyrate), 0.5 parts of initiator (potassium persulfate), 1.5 parts of sodium hydroxide, 2 parts of defoamer (silicone defoamer MSD-916), 0.4 parts of bactericide (isothiazolinone), and 200 parts of water.

[0039] The filler includes heavy calcium, precipitated barium sulfate and pseudo-boehmite in a weight ratio of 10:1:1. The particle size of heavy calcium is 500 mesh, the particle size of precipitated barium sulfate is 3000 mesh, and the average particle size of pseudo-boehmite is 10nm.

[0040] The preparation of the above-mentioned polymer-based anti-seepage and anti-alkali slurry comprises the following steps: (1) mixing an acrylic dispersant, a defoaming agent, and 80% by weight of water to obtain a first solution; (2) mixing the initiator and the remaining 20% ​​by weight of water to obtain an initiator solution; (3) adding styrene butadiene emulsion, acrylic emulsion, 2-methacryloyloxyethyl phosphorylcholine, precipitated barium sulfate and pseudo-boehmite to the first solution and stirring and mixing, then adding 70% by weight of the initiator solution, stirring at a low speed of 150 r / min, and heating to 70° C. for reaction for 90 min; (4) adding heavy calcium and the remaining 30% by weight of the initiator solution, stirring at a high speed of 250 r / min, and maintaining the temperature at 80° C. for 15 min; (5) After cooling, a fungicide and a film-forming aid are added, sodium hydroxide is added to adjust the pH to 8-9, the mixture is stirred for 50 minutes, and the material is filtered to obtain a polymer-based anti-seepage and anti-alkali slurry.

[0041] Example 3 The polymer-based anti-seepage and anti-alkali slurry comprises the following raw material components by weight: 300 parts of styrene-butadiene emulsion (C3615, solid content of 49%, viscosity of 200mPa·s), 100 parts of acrylic emulsion (S400, solid content of 57%, viscosity of 400mPa·s), 10 parts of acrylic dispersant (methacrylic acid), 10 parts of 2-methacryloyloxyethyl phosphorylcholine, 300 parts of filler, 1 part of film-forming aid (2,2,4-trimethyl-1,3-pentanediol monoisobutyrate), 1 part of initiator (potassium persulfate), 1.2 parts of sodium hydroxide, 2 parts of defoamer (silicone defoamer MSD-916), 0.4 parts of bactericide (isothiazolinone), and 200 parts of water.

[0042] The filler includes heavy calcium, precipitated barium sulfate and pseudo-boehmite in a weight ratio of 10:1:1. The particle size of heavy calcium is 500 mesh, the particle size of precipitated barium sulfate is 3000 mesh, and the average particle size of pseudo-boehmite is 10nm.

[0043] The preparation of the above-mentioned polymer-based anti-seepage and anti-alkali slurry comprises the following steps: (1) mixing an acrylic dispersant, a defoaming agent, and 80% by weight of water to obtain a first solution; (2) mixing the initiator and the remaining 20% ​​by weight of water to obtain an initiator solution; (3) adding styrene butadiene emulsion, acrylic emulsion, 2-methacryloyloxyethyl phosphorylcholine, precipitated barium sulfate and pseudo-boehmite to the first solution and stirring and mixing, then adding 70% by weight of the initiator solution, stirring at a low speed of 150 r / min, and heating to 70° C. for reaction for 90 min; (4) adding heavy calcium and the remaining 30% by weight of the initiator solution, stirring at a high speed of 250 r / min, and maintaining the temperature at 80° C. for 15 min; (5) After cooling, a fungicide and a film-forming aid are added, sodium hydroxide is added to adjust the pH to 8-9, the mixture is stirred for 50 minutes, and the material is filtered to obtain a polymer-based anti-seepage and anti-alkali slurry.

[0044] Example 4 The polymer-based anti-seepage and anti-alkali slurry comprises the following raw material components by weight: 300 parts of styrene-butadiene emulsion (C3615, solid content of 49%, viscosity of 200mPa·s), 100 parts of acrylic emulsion (S400, solid content of 57%, viscosity of 400mPa·s), 8 parts of acrylic dispersant (methacrylic acid), 8 parts of 2-methacryloyloxyethyl phosphorylcholine, 250 parts of filler, 1.5 parts of film-forming aid (2,2,4-trimethyl-1,3-pentanediol monoisobutyrate), 1 part of initiator (potassium persulfate), 1.2 parts of sodium hydroxide, 2 parts of defoamer (silicone defoamer MSD-916), 0.4 parts of bactericide (isothiazolinone), and 200 parts of water.

[0045] The filler includes heavy calcium, precipitated barium sulfate and pseudo-boehmite in a weight ratio of 10:1:1. The particle size of heavy calcium is 500 mesh, the particle size of precipitated barium sulfate is 3000 mesh, and the average particle size of pseudo-boehmite is 10nm.

[0046] The preparation of the above-mentioned polymer-based anti-seepage and anti-alkali slurry comprises the following steps: (1) mixing an acrylic dispersant, a defoaming agent, and 80% by weight of water to obtain a first solution; (2) mixing the initiator and the remaining 20% ​​by weight of water to obtain an initiator solution; (3) adding styrene butadiene emulsion, acrylic emulsion, 2-methacryloyloxyethyl phosphorylcholine, precipitated barium sulfate and pseudo-boehmite to the first solution and stirring and mixing, then adding 80% by weight of the initiator solution, stirring at a low speed of 150 r / min, and heating to 80° C. for reaction for 70 min; (4) adding heavy calcium and the remaining 20% ​​by weight of the initiator solution, stirring at a speed of 250 r / min, and maintaining the temperature at 75° C. for 20 min; (5) After cooling, a fungicide and a film-forming aid are added, sodium hydroxide is added to adjust the pH to 8-9, the mixture is stirred for 50 minutes, and the material is filtered to obtain a polymer-based anti-seepage and anti-alkali slurry.

[0047] Comparative Example 1 The difference from Example 1 is that 2-methacryloyloxyethyl phosphorylcholine is not added.

[0048] The polymer-based anti-seepage and anti-alkali slurry comprises the following raw material components by weight: 300 parts of styrene-butadiene emulsion (C3615, solid content of 49%, viscosity of 200mPa·s), 100 parts of acrylic emulsion (S400, solid content of 57%, viscosity of 400mPa·s), 8 parts of acrylic dispersant (methacrylic acid), 250 parts of filler, 1.5 parts of film-forming aid (2,2,4-trimethyl-1,3-pentanediol monoisobutyrate), 1 part of initiator (potassium persulfate), 1.2 parts of sodium hydroxide, 2 parts of defoamer (silicone defoamer MSD-916), 0.4 parts of bactericide (isothiazolinone), and 200 parts of water.

[0049] The filler includes heavy calcium, precipitated barium sulfate and pseudo-boehmite in a weight ratio of 10:1:1. The particle size of heavy calcium is 500 mesh, the particle size of precipitated barium sulfate is 3000 mesh, and the average particle size of pseudo-boehmite is 10nm.

[0050] The preparation of the above-mentioned polymer-based anti-seepage and anti-alkali slurry comprises the following steps: (1) mixing an acrylic dispersant, a defoaming agent, and 80% by weight of water to obtain a first solution; (2) mixing the initiator and the remaining 20% ​​by weight of water to obtain an initiator solution; (3) adding styrene butadiene emulsion, acrylic emulsion, precipitated barium sulfate and pseudo-boehmite to the first solution and stirring and mixing, then adding 70% by weight of the initiator solution, stirring at a low speed of 150 r / min, and heating to 70° C. for reaction for 90 min; (4) adding heavy calcium and the remaining 30% by weight of the initiator solution, stirring at a high speed of 250 r / min, and maintaining the temperature at 80° C. for 15 min; (5) After cooling, a fungicide and a film-forming aid are added, sodium hydroxide is added to adjust the pH to 8-9, the mixture is stirred for 50 minutes, and the material is filtered to obtain a polymer-based anti-seepage and anti-alkali slurry.

[0051] Comparative Example 2 The difference from Example 1 is that no pseudo-boehmite is added.

[0052] The polymer-based anti-seepage and anti-alkali slurry comprises the following raw material components by weight: 300 parts of styrene-butadiene emulsion (C3615, solid content of 49%, viscosity of 200mPa·s), 100 parts of acrylic emulsion (S400, solid content of 57%, viscosity of 400mPa·s), 8 parts of acrylic dispersant (methacrylic acid), 8 parts of 2-methacryloyloxyethyl phosphorylcholine, 229 parts of filler, 1.5 parts of film-forming aid (2,2,4-trimethyl-1,3-pentanediol monoisobutyrate), 1 part of initiator (potassium persulfate), 1.2 parts of sodium hydroxide, 2 parts of defoamer (silicone defoamer MSD-916), 0.4 parts of bactericide (isothiazolinone), and 200 parts of water.

[0053] The filler includes heavy calcium and precipitated barium sulfate in a weight ratio of 10:1. The particle size of the heavy calcium is 500 mesh, and the particle size of the precipitated barium sulfate is 3000 mesh.

[0054] The preparation of the above-mentioned polymer-based anti-seepage and anti-alkali slurry comprises the following steps: (1) mixing an acrylic dispersant, a defoaming agent, and 80% by weight of water to obtain a first solution; (2) mixing the initiator and the remaining 20% ​​by weight of water to obtain an initiator solution; (3) adding styrene butadiene emulsion, acrylic emulsion, 2-methacryloyloxyethyl phosphorylcholine and precipitated barium sulfate to the first solution and stirring and mixing, then adding 70% by weight of the initiator solution, stirring at a low speed of 150 r / min, and heating to 70° C. for reaction for 90 min; (4) adding heavy calcium and the remaining 30% by weight of the initiator solution, stirring at a high speed of 250 r / min, and maintaining the temperature at 80° C. for 15 min; (5) After cooling, a fungicide and a film-forming aid are added, and sodium hydroxide is added to adjust the pH to 8-9. The mixture is stirred for 50 minutes, and the material is filtered to obtain a polymer-based anti-seepage and anti-alkali slurry.

[0055] Comparative Example 3 The difference from Example 1 is that the added amount and proportion of the filler are different.

[0056] The polymer-based anti-seepage and anti-alkali slurry comprises the following raw material components by weight: 300 parts of styrene-butadiene emulsion (C3615, solid content of 49%, viscosity of 200mPa·s), 100 parts of acrylic emulsion (S400, solid content of 57%, viscosity of 400mPa·s), 8 parts of acrylic dispersant (methacrylic acid), 8 parts of 2-methacryloyloxyethyl phosphorylcholine, 200 parts of filler, 1.5 parts of film-forming aid (2,2,4-trimethyl-1,3-pentanediol monoisobutyrate), 1 part of initiator (potassium persulfate), 1.2 parts of sodium hydroxide, 2 parts of defoamer (silicone defoamer MSD-916), 0.4 parts of bactericide (isothiazolinone), and 200 parts of water.

[0057] The filler includes heavy calcium, precipitated barium sulfate and pseudo-boehmite in a weight ratio of 8:2:2. The particle size of heavy calcium is 500 mesh, the particle size of precipitated barium sulfate is 3000 mesh, and the average particle size of pseudo-boehmite is 10nm.

[0058] The preparation of the above-mentioned polymer-based anti-seepage and anti-alkali slurry comprises the following steps: (1) mixing an acrylic dispersant, a defoaming agent, and 80% by weight of water to obtain a first solution; (2) mixing the initiator and the remaining 20% ​​by weight of water to obtain an initiator solution; (3) adding styrene butadiene emulsion, acrylic emulsion, 2-methacryloyloxyethyl phosphorylcholine, precipitated barium sulfate and pseudo-boehmite to the first solution and stirring and mixing, then adding 70% by weight of the initiator solution, stirring at a low speed of 150 r / min, and heating to 70° C. for reaction for 90 min; (4) adding heavy calcium and the remaining 30% by weight of the initiator solution, stirring at a high speed of 250 r / min, and maintaining the temperature at 80° C. for 15 min; (5) After cooling, a fungicide and a film-forming aid are added, and sodium hydroxide is added to adjust the pH to 8-9. The mixture is stirred for 50 minutes, and the material is filtered to obtain a polymer-based anti-seepage and anti-alkali slurry.

[0059] Comparative Example 4 The difference from Example 1 is that the amount of styrene-butadiene emulsion added is less.

[0060] The polymer-based anti-seepage and anti-alkali slurry comprises the following raw material components by weight: 250 parts of styrene-butadiene emulsion (C3615, solid content of 49%, viscosity of 200mPa·s), 100 parts of acrylic emulsion (S400, solid content of 57%, viscosity of 400mPa·s), 8 parts of acrylic dispersant (methacrylic acid), 8 parts of 2-methacryloyloxyethyl phosphorylcholine, 250 parts of filler, 1.5 parts of film-forming aid (2,2,4-trimethyl-1,3-pentanediol monoisobutyrate), 1 part of initiator (potassium persulfate), 1.2 parts of sodium hydroxide, 2 parts of defoamer (silicone defoamer MSD-916), 0.4 parts of bactericide (isothiazolinone), and 200 parts of water.

[0061] The filler includes heavy calcium, precipitated barium sulfate and pseudo-boehmite in a weight ratio of 10:1:1. The particle size of heavy calcium is 500 mesh, the particle size of precipitated barium sulfate is 3000 mesh, and the average particle size of pseudo-boehmite is 10nm.

[0062] The preparation of the above-mentioned polymer-based anti-seepage and anti-alkali slurry comprises the following steps: (1) mixing an acrylic dispersant, a defoaming agent, and 80% by weight of water to obtain a first solution; (2) mixing the initiator and the remaining 20% ​​by weight of water to obtain an initiator solution; (3) adding styrene butadiene emulsion, acrylic emulsion, 2-methacryloyloxyethyl phosphorylcholine, precipitated barium sulfate and pseudo-boehmite to the first solution and stirring and mixing, then adding 70% by weight of the initiator solution, stirring at a low speed of 150 r / min, and heating to 70° C. for reaction for 90 min; (4) adding heavy calcium and the remaining 30% by weight of the initiator solution, stirring at a high speed of 250 r / min, and maintaining the temperature at 80° C. for 15 min; (5) After cooling, a fungicide and a film-forming aid are added, and sodium hydroxide is added to adjust the pH to 8-9. The mixture is stirred for 50 minutes, and the material is filtered to obtain a polymer-based anti-seepage and anti-alkali slurry.

[0063] Comparative Example 5 The difference from Example 1 is that the order of adding the fillers is different.

[0064] The polymer-based anti-seepage and anti-alkali slurry comprises the following raw material components by weight: 300 parts of styrene-butadiene emulsion (C3615, solid content of 49%, viscosity of 200mPa·s), 100 parts of acrylic emulsion (S400, solid content of 57%, viscosity of 400mPa·s), 8 parts of acrylic dispersant (methacrylic acid), 8 parts of 2-methacryloyloxyethyl phosphorylcholine, 250 parts of filler, 1.5 parts of film-forming aid (2,2,4-trimethyl-1,3-pentanediol monoisobutyrate), 1 part of initiator (potassium persulfate), 1.2 parts of sodium hydroxide, 2 parts of defoamer (silicone defoamer MSD-916), 0.4 parts of bactericide (isothiazolinone), and 200 parts of water.

[0065] The filler includes heavy calcium, precipitated barium sulfate and pseudo-boehmite in a weight ratio of 10:1:1. The particle size of heavy calcium is 500 mesh, the particle size of precipitated barium sulfate is 3000 mesh, and the average particle size of pseudo-boehmite is 10nm.

[0066] The preparation of the above-mentioned polymer-based anti-seepage and anti-alkali slurry comprises the following steps: (1) mixing an acrylic dispersant, a defoaming agent, and 80% by weight of water to obtain a first solution; (2) mixing the initiator and the remaining 20% ​​by weight of water to obtain an initiator solution; (3) adding styrene butadiene emulsion, acrylic emulsion, 2-methacryloyloxyethyl phosphorylcholine, precipitated barium sulfate, pseudo-boehmite and heavy calcium to the first solution and stirring and mixing, then adding 70% by weight of the initiator solution, stirring at a low speed of 150 r / min, and heating to 70° C. for reaction for 90 minutes; (4) adding the remaining 30% by weight of the initiator solution, stirring at a speed of 250 r / min, and maintaining the temperature at 80° C. for 15 min; (5) After cooling, a fungicide and a film-forming aid are added, and sodium hydroxide is added to adjust the pH to 8-9. The mixture is stirred for 50 minutes, and the material is filtered to obtain a polymer-based anti-seepage and anti-alkali slurry.

[0067] The performance test was carried out based on "JC / T 2090-2011 Polymer Cement Waterproof Slurry". The coating thickness of the slurry was 1.5mm, and the film was cured at 23°C and 50% humidity.

[0068] Among them, the alkali resistance is to scrape the slurry onto a (70×70×20) mm cement mortar block with a thickness of 1.5 mm, cure it to 7 days, and soak it in a saturated calcium hydroxide solution for 168 hours. Then take out the test piece and observe whether there is cracking or peeling. If there is no cracking or peeling, it is qualified. The degree of cracking and peeling from best to worst is as follows: slight cracking and peeling, partial cracking and peeling, and severe cracking and peeling.

[0069] Table 1 As shown in Table 1, the waterproof membrane obtained by the polymer-based anti-seepage and anti-alkali slurry in the present invention has good flexibility, flexural and compressive strength, anti-seepage pressure, bonding strength and alkali resistance.

[0070] Comparative Example 1 shows that 2-methacryloyloxyethyl phosphorylcholine mainly affects the compatibility and binding of each component, as well as the cross-linking structure, and thus has a certain influence on the mechanical properties and alkali resistance of the waterproof membrane. Comparative Example 2 shows that pseudo-boehmite mainly affects the filling effect of the filler, as well as the dispersion and binding of the filler in the matrix, and thus has a greater impact on the flexural compressive strength and the anti-seepage pressure. Comparative Example 3 shows that the proportion of heavy calcium added to the filler is relatively small, because it has a greater impact on the filling effect of the filler, and then relative to Comparative Example 2, Comparative Example 3 will also have a greater impact on the alkali resistance of the waterproof membrane. The addition ratio of styrene-butadiene emulsion in Comparative Example 4 is relatively small, which will lead to a significant decrease in flexibility, impermeability and alkali resistance. In Comparative Example 5, the order of adding fillers changes. Since the amount of heavy calcium added is relatively large, its addition before initiating cross-linking will affect the cross-linking effect, and the stability of the internal structure will deteriorate, resulting in poor mechanical properties and alkali resistance of the waterproof membrane.

[0071] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the specification of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A polymer-based anti-seepage and anti-alkali slurry, characterized in that: The raw material components include, by weight: 300-350 parts of styrene-butadiene emulsion, 50-100 parts of acrylic emulsion, 6-10 parts of acrylic dispersant, 6-10 parts of 2-methacryloyloxyethyl phosphorylcholine, 200-300 parts of filler, 1-3 parts of film-forming aid, 0.5-2 parts of initiator, 0.5-2 parts of sodium hydroxide and 200 parts of water; the filler includes heavy calcium, precipitated barium sulfate and pseudo-boehmite.

2. The polymer-based anti-seepage and anti-alkali slurry according to claim 1, characterized in that: The filler includes heavy calcium, precipitated barium sulfate and pseudo-boehmite in a weight ratio of 10:1:

1.

3. The polymer-based anti-seepage and anti-alkali slurry according to claim 1, characterized in that: The solid content of the styrene-butadiene emulsion is 45-50%, and the viscosity is 100-200 mPa·s.

4. The polymer-based anti-seepage and anti-alkali slurry according to claim 1, characterized in that: The acrylic emulsion has a solid content of 55-60% and a viscosity of 300-500 mPa·s.

5. The polymer-based anti-seepage and anti-alkali slurry according to any one of claims 1 to 4, characterized in that: The acrylic dispersant includes one or more of acrylic acid, methacrylic acid and 2-ethylacrylic acid.

6. The polymer-based anti-seepage and anti-alkali slurry according to claim 1, characterized in that: The following raw material components are also included by weight: 1 to 3 parts of defoaming agent and 0.1 to 1 part of bactericide.

7. The polymer-based anti-seepage and anti-alkali slurry according to claim 6, characterized in that: The defoamer is an organosilicon defoamer.

8. The polymer-based anti-seepage and anti-alkali slurry according to claim 6 or 7, characterized in that: The bactericide is an isothiazolinone bactericide.

9. A method for preparing the polymer-based anti-seepage and anti-alkali slurry according to any one of claims 1 to 8, characterized in that: The steps include: (1) mixing an acrylic dispersant, a defoaming agent, and 80 to 90% by weight of water to obtain a first solution; (2) mixing the initiator and the remaining weight portion of water to obtain an initiator solution; (3) Add styrene butadiene emulsion, acrylic emulsion, 2-methacryloyloxyethyl phosphorylcholine, precipitated barium sulfate and pseudo-boehmite to the first solution and stir to mix, then add 70-80% by weight of the initiator solution, stir at a low speed and heat to 70-80° C. to react for 60-90 minutes; (4) Add heavy calcium and the remaining weight of the initiator solution, stir at high speed and keep the temperature at 70-80°C for 10-20 minutes; (5) After cooling, add bactericide and film-forming aid, add sodium hydroxide to adjust the pH to 7-9, stir for 30-60 minutes, filter the material, and obtain a polymer-based anti-seepage and anti-alkali slurry.

10. The method for preparing the polymer-based anti-seepage and anti-alkali slurry according to claim 9, characterized in that: In step (3), the speed of low-speed stirring is 100-150 r / min; in step (4), the speed of high-speed stirring is 200-300 r / min.

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