CN111410497A - Waterproof gypsum-based caulking paste - Google Patents
Waterproof gypsum-based caulking paste Download PDFInfo
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- CN111410497A CN111410497A CN201910924378.3A CN201910924378A CN111410497A CN 111410497 A CN111410497 A CN 111410497A CN 201910924378 A CN201910924378 A CN 201910924378A CN 111410497 A CN111410497 A CN 111410497A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/40—Compounds containing silicon, titanium or zirconium or other organo-metallic compounds; Organo-clays; Organo-inorganic complexes
- C04B24/42—Organo-silicon compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/12—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polysiloxanes
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
- C04B2103/65—Water proofers or repellants
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00663—Uses not provided for elsewhere in C04B2111/00 as filling material for cavities or the like
- C04B2111/00672—Pointing or jointing materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Sealing Material Composition (AREA)
Abstract
The invention relates to the technical field of building materials, and discloses waterproof gypsum-based caulking paste which comprises, by weight, 800-1000 parts of gypsum, 10-12 parts of plant short fibers with the length of 10-20 mm, 0.2-0.5 part of retarder, 2-4 parts of water-retaining agent, 1-8 parts of latex powder, 0.5-1.5 parts of anti-sagging agent, 3-5 parts of polydimethylsiloxane-grafted styrene-butyl acrylate-silane coupling agent emulsion copolymer and 400-800 parts of water. According to the invention, the polydimethylsiloxane grafted styrene-butyl acrylate-silane coupling agent emulsion copolymer is added into the gypsum-based caulking paste, so that the excellent cohesiveness of the styrene-butyl acrylate emulsion and the good hydrophobicity of polydimethylsiloxane and silane coupling agent are achieved, the gypsum-based caulking paste has good adhesive force on the surface of a paper gypsum board, meanwhile, the waterproof property is given to the gypsum-based caulking paste, the gypsum-based caulking paste is effectively prevented from water absorption and deformation, and the service life of the gypsum-based caulking paste is prolonged.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to waterproof gypsum-based caulking paste.
Background
The gypsum-based caulking paste is a wall repairing material which is formed by mixing gypsum as a main raw material and various additives and is used for filling slab joints of building walls. Such as: the cement board, the gypsum board, the top board, the nail holes and other parts needing caulking have stronger binding power, and are necessary matching products for indoor decoration.
The gypsum-based caulking paste in the prior art is prepared by taking gypsum as a main raw material and adding auxiliary agents such as a retarder, a binder, a water-retaining agent and the like, for example, "a caulking paste formula" disclosed in the Chinese patent literature, and the publication No. CN107500701A comprises the following components in percentage by mass: 55-60% of heavy calcium powder, 5-8% of ash calcium powder, 30-35% of gypsum, 1.0-1.7% of bentonite, 1-1.5% of latex powder, 2-3% of hydroxypropyl methyl cellulose, 1-3% of retarder and 2-3.5% of wood fiber.
However, the gypsum material is easy to absorb water, the existing gypsum-based caulking paste is not waterproof, and after caulking, seams are easy to deform due to water absorption to crack and fall off, so that the construction quality and the decoration attractiveness are affected.
Disclosure of Invention
The invention aims to overcome the problems that the gypsum-based caulking paste in the prior art has no waterproofness, and the construction quality and the decoration aesthetic degree are affected because joints are easy to crack and fall off due to water absorption after caulking, and provides the waterproof gypsum-based caulking paste.
In order to achieve the purpose, the invention adopts the following technical scheme:
the waterproof gypsum-based caulking paste comprises, by weight, 800-1000 parts of gypsum, 10-12 parts of plant short fibers with the length of 10-20 mm, 0.2-0.5 part of retarder, 2-4 parts of water-retaining agent, 1-8 parts of latex powder, 0.5-1.5 parts of anti-sagging agent, 3-5 parts of polydimethylsiloxane grafted styrene-butyl acrylate-silane coupling agent emulsion copolymer and 400-800 parts of water.
The invention adds dimethyl silicone polymer grafted styrene-butyl acrylate-silane coupling agent emulsion copolymer into the gypsum-based caulking paste, and the styrene-butyl acrylate emulsion is an excellent adhesive, can improve the adhesive force of the caulking paste on the surface of a paper gypsum board, has good heat resistance and aging resistance, but has poor waterproofness.
The organic silicon waterproof agent is an ideal waterproof material, is added into the caulking paste, can generate dendritic, chain-like and net-like molecules through the interaction of active groups to form a net-like hydrophobic siloxane membrane, and the siloxane molecular membrane has very low surface tension, so that the caulking paste has good hydrophobic effect and effectively prevents the intrusion of moisture; and the organosilicon waterproofing agent has certain plastic strength, can effectively reduce the drying shrinkage of the caulking paste, prevent the internal stress generated by the shrinkage of the caulking paste and improve the crack resistance of the caulking paste. But the organosilicon waterproofing agent is directly added into the caulking paste, so that the caulking paste has poor waterproof durability and is easy to run off.
Therefore, the invention bonds styrene-butyl acrylate emulsion and silane coupling agent with hydrophobic property, grafts organic silicon waterproofing agent polydimethylsiloxane on the side chain, modifies the adhesive styrene-butyl acrylate emulsion, and obtains the product of the emulsion copolymer of the styrene-butyl acrylate-silane coupling agent grafted by the polydimethylsiloxane, which not only has good cohesiveness and improves the cohesiveness between jointing paste and a paper gypsum board, but also has good hydrophobic property, greatly improves the waterproof property of the jointing paste, effectively prevents the gypsum-based jointing paste from water absorption deformation, and prolongs the service life of the gypsum-based jointing paste.
The setting retarder can adjust the setting time of the caulking paste; the water-retaining agent can prevent the caulking paste from affecting full hydration due to water loss in the using process, reduce the bonding strength and cause cracks; the anti-sagging agent can thicken, harden and weigh the gypsum, so that the gypsum does not sag when the gypsum board is bonded, and the caulking paste is smoother, softer and easier to trowel; the plant short fibers can improve the tensile strength of the gypsum base.
Preferably, the method for preparing the polydimethylsiloxane-grafted styrene-butyl acrylate-silane coupling agent emulsion copolymer comprises the following steps:
(1) dissolving alkylphenol polyoxyethylene and sodium bicarbonate in water, and stirring until the alkylphenol polyoxyethylene and the sodium bicarbonate are completely dissolved to obtain a base solution A;
(2) dissolving alkylphenol ethoxylates in water, stirring until the alkylphenol ethoxylates is completely dissolved, adding a styrene monomer, a butyl acrylate monomer, ammonium persulfate, a silane coupling agent and hydroxyl-terminated polydimethylsiloxane, and stirring for 20-30 min to obtain a pre-emulsion B;
(3) heating the base solution A to 60-70 ℃, adding 5-10% by mass of pre-emulsion B, heating to 75-80 ℃, and stirring for reaction for 30-60 min;
(4) adding propylene glycol and dibutyltin dilaurate into the product obtained in the step (3), uniformly stirring, then adding the rest pre-emulsion B, and stirring and reacting for 1-2 h at the temperature of 80-85 ℃;
(5) and cooling to room temperature, adjusting the pH value to 6-8 by using ammonia water, and filtering to obtain the polydimethylsiloxane grafted styrene-butyl acrylate-silane coupling agent emulsion copolymer.
Preferably, in the step (1), the mass ratio of the alkylphenol polyoxyethylene ether to the sodium bicarbonate to the water is (2-6): 1: (60-70).
Preferably, the mass ratio of the alkylphenol polyoxyethylene ether and the water in the step (2) to the mass ratio in the step (1) is (1-2): 1.
preferably, in the step (2), the mass ratio of alkylphenol polyoxyethylene, styrene monomer, butyl acrylate monomer, ammonium persulfate, silane coupling agent and hydroxyl-terminated polydimethylsiloxane is (1-3): (22-23): (22-23): (0.2-0.3): 1: (1-3).
Preferably, the mass ratio of the propylene glycol and the dibutyltin dilaurate to the hydroxyl-terminated polydimethylsiloxane added in the step (4) is (4-10): 1: (100-200).
The invention takes ammonium persulfate as an initiator, and styrene-butyl acrylate emulsion is obtained by styrene and butyl acrylate monomers through an emulsion polymerization method. The butyl acrylate monomer has larger polarity, the polydimethylsiloxane has low surface energy, and the butyl acrylate monomer and the polydimethylsiloxane are difficult to form a homogeneous copolymer, so that a silane coupling agent is added, on one hand, C ═ C double bonds in the molecule are copolymerized with butyl acrylate unsaturated bonds under the action of an initiator to form a block copolymer, on the other hand, a siloxane structure in the molecule can be copolymerized with the polydimethylsiloxane with low surface energy to form a graft chain segment, and the hydroxyl-terminated polydimethylsiloxane is grafted on the side chain of the polydimethylsiloxane through polycondensation in the presence of a catalyst dibutyltin dilaurate, so that the compatibility of the polydimethylsiloxane and the styrene-butyl acrylate emulsion is increased.
The alkylphenol ethoxylates is used as an emulsifier, so that the latex particles can be prevented from being coagulated in the reaction process; sodium bicarbonate is used as a buffering agent to ensure the pH stability in the reaction process; the propylene glycol is a hydrolysis inhibitor, and prevents the polydimethylsiloxane from being hydrolyzed and polymerized to form oligomer, so that the performance of the product is influenced.
Preferably, the retarder is sodium citrate or sodium polyphosphate. The setting time of the gypsum after meeting water is short, and the setting time of the caulking paste can be adjusted by adding sodium citrate or sodium polyphosphate, so that the caulking paste is convenient to use.
Preferably, the water-retaining agent is one of cellulose ether, carboxymethyl cellulose and polyacrylamide. The water-retaining agent is added, so that the phenomenon that the caulking paste is fully hydrated due to dehydration in the use process, the bonding strength is reduced, and cracks are caused can be avoided; and the caulking paste has good plasticity and flexibility, can adapt to the shrinkage deformation of the base material, and improves the bonding strength and the crack resistance of the caulking paste.
Preferably, the anti-sagging agent is a starch ether. The starch ether can make the gypsum thicken, harden and weigh, so that the gypsum does not sag when the gypsum board is bonded, and the caulking paste is smoother, softer and easier to trowel.
Preferably, the plant short fiber is one or more of wood fiber, bamboo fiber and cotton fiber. Plant short fibers are added into the gypsum-based caulking paste, so that the tensile property between gypsum boards can be improved.
Therefore, the invention has the following beneficial effects: the polydimethylsiloxane grafted styrene-butyl acrylate-silane coupling agent emulsion copolymer is added into the gypsum-based caulking paste, so that the excellent cohesiveness of the styrene-butyl acrylate emulsion and the good hydrophobicity of polydimethylsiloxane and silane coupling agent are achieved, the gypsum-based caulking paste is endowed with waterproofness while the caulking paste has good adhesive force on the surface of a paper gypsum board, the gypsum-based caulking paste is effectively prevented from water absorption and deformation, the waterproof durability is ensured, and the service life of the gypsum-based caulking paste is prolonged.
Detailed Description
The invention is further described with reference to specific embodiments.
In the present invention, all raw materials are commercially available or commonly used in the industry, if not specified.
Example 1:
the waterproof gypsum-based caulking paste comprises, by weight, 900 parts of gypsum, 11 parts of bamboo fiber with the length of 15mm, 0.3 part of sodium citrate, 3 parts of cellulose ether, 5 parts of redispersible latex powder, 1 part of starch ether, 4 parts of polydimethylsiloxane-grafted styrene-butyl acrylate-silane coupling agent emulsion copolymer and 500 parts of water.
The preparation method of the polydimethylsiloxane grafted styrene-butyl acrylate-silane coupling agent emulsion copolymer comprises the following steps:
(1) dissolving alkylphenol polyoxyethylene ether and sodium bicarbonate in water, and stirring until the alkylphenol polyoxyethylene ether and the sodium bicarbonate are completely dissolved to obtain a base solution A, wherein the mass ratio of the alkylphenol polyoxyethylene ether to the sodium bicarbonate to the water is 4:1: 65;
(2) and (2) dissolving alkylphenol polyoxyethylene into water, wherein the mass ratio of the alkylphenol polyoxyethylene to the water to the mass ratio in the step (1) is 1.5: 1, stirring to completely dissolve, adding a styrene monomer, a butyl acrylate monomer, ammonium persulfate, a silane coupling agent and hydroxyl-terminated polydimethylsiloxane, and stirring for 25min to obtain a pre-emulsion B, wherein the mass ratio of alkylphenol polyoxyethylene, the styrene monomer, the butyl acrylate monomer, the ammonium persulfate, the silane coupling agent and the hydroxyl-terminated polydimethylsiloxane is 2:22.5:22.5:0.25:1: 2;
(3) heating the base solution A to 65 ℃, adding 8 mass percent of pre-emulsion B, heating to 75 ℃, and stirring for reacting for 40 min;
(4) adding propylene glycol and dibutyltin dilaurate into the product obtained in the step (3), uniformly stirring, then adding the rest pre-emulsion B, and stirring and reacting for 1.5h at 80 ℃, wherein the mass ratio of the propylene glycol to the dibutyltin dilaurate to the hydroxyl-terminated polydimethylsiloxane is 6:1: 150;
(5) after cooling to room temperature, adjusting the pH value to 7 by using ammonia water, and filtering to obtain the polydimethylsiloxane grafted styrene-butyl acrylate-silane coupling agent emulsion copolymer.
Example 2:
the waterproof gypsum-based caulking paste comprises, by weight, 800 parts of gypsum, 10 parts of wood fibers with the length of 10mm, 5 parts of cotton fibers with the length of 10mm, 0.2 part of sodium polyphosphate, 2 parts of carboxymethyl cellulose, 1 part of redispersible latex powder, 0.5 part of starch ether, 3 parts of polydimethylsiloxane-grafted styrene-butyl acrylate-silane coupling agent emulsion copolymer and 400 parts of water.
The preparation method of the polydimethylsiloxane grafted styrene-butyl acrylate-silane coupling agent emulsion copolymer comprises the following steps:
(1) dissolving alkylphenol polyoxyethylene ether and sodium bicarbonate in water, and stirring until the alkylphenol polyoxyethylene ether and the sodium bicarbonate are completely dissolved to obtain a base solution A, wherein the mass ratio of the alkylphenol polyoxyethylene ether to the sodium bicarbonate to the water is 2:1: 60;
(2) dissolving alkylphenol ethoxylates with the same mass as that in the step (1) in water with the same mass, stirring until the alkylphenol ethoxylates is completely dissolved, adding a styrene monomer, a butyl acrylate monomer, ammonium persulfate, a silane coupling agent and hydroxyl-terminated polydimethylsiloxane, and stirring for 20min to obtain a pre-emulsion B, wherein the mass ratio of the alkylphenol ethoxylates to the styrene monomer to the butyl acrylate monomer to the ammonium persulfate to the silane coupling agent to the hydroxyl-terminated polydimethylsiloxane is 1:22:22:0.2:1: 1;
(3) heating the base solution A to 60 ℃, adding 5% by mass of pre-emulsion B, heating to 75 ℃, and stirring for reacting for 60 min;
(4) adding propylene glycol and dibutyltin dilaurate into the product obtained in the step (3), uniformly stirring, then adding the rest pre-emulsion B, and stirring and reacting for 2 hours at 80 ℃, wherein the mass ratio of the propylene glycol to the dibutyltin dilaurate to the hydroxyl-terminated polydimethylsiloxane is 4:1: 100;
(5) cooling to room temperature, adjusting the pH value to 6 with ammonia water, and filtering to obtain the polydimethylsiloxane grafted styrene-butyl acrylate-silane coupling agent emulsion copolymer.
Example 3:
the waterproof gypsum-based caulking paste comprises, by weight, 1000 parts of gypsum, 10 parts of bamboo fiber with the length of 20mm, 0.5 part of sodium citrate, 4 parts of polyacrylamide, 8 parts of redispersible latex powder, 1.5 parts of starch ether, 5 parts of polydimethylsiloxane-grafted styrene-butyl acrylate-silane coupling agent emulsion copolymer and 800 parts of water.
The preparation method of the polydimethylsiloxane grafted styrene-butyl acrylate-silane coupling agent emulsion copolymer comprises the following steps:
(1) dissolving alkylphenol polyoxyethylene ether and sodium bicarbonate in water, and stirring until the alkylphenol polyoxyethylene ether and the sodium bicarbonate are completely dissolved to obtain a base solution A, wherein the mass ratio of the alkylphenol polyoxyethylene ether to the sodium bicarbonate to the water is 6:1: 70;
(2) and (2) dissolving alkylphenol polyoxyethylene into water, wherein the mass ratio of the alkylphenol polyoxyethylene to the water in the step (1) is 2:1, stirring to completely dissolve, adding a styrene monomer, a butyl acrylate monomer, ammonium persulfate, a silane coupling agent and hydroxyl-terminated polydimethylsiloxane, stirring for 30min to obtain a pre-emulsion B, wherein the mass ratio of alkylphenol polyoxyethylene, the styrene monomer, the butyl acrylate monomer, the ammonium persulfate, the silane coupling agent and the hydroxyl-terminated polydimethylsiloxane is 3:23:23:0.3:1: 3;
(3) heating the base solution A to 70 ℃, adding 10% by mass of the pre-emulsion B, heating to 80 ℃, and stirring for reaction for 30 min;
(4) adding propylene glycol and dibutyltin dilaurate into the product obtained in the step (3), uniformly stirring, then adding the rest pre-emulsion B, and stirring at 85 ℃ for reaction for 1h, wherein the mass ratio of the propylene glycol to the dibutyltin dilaurate to the hydroxyl-terminated polydimethylsiloxane is 10:1: 200;
(5) after cooling to room temperature, adjusting the pH value to 8 by using ammonia water, and filtering to obtain the polydimethylsiloxane grafted styrene-butyl acrylate-silane coupling agent emulsion copolymer.
Comparative example 1:
a waterproof gypsum-based caulking paste comprises, by weight, 900 parts of gypsum, 11 parts of bamboo fibers with the length of 15mm, 0.3 part of sodium citrate, 3 parts of cellulose ether, 5 parts of redispersible latex powder, 1 part of starch ether and 500 parts of water.
Comparative example 2:
comparative example 2 is different from example 1 in that the bamboo fiber is not added in comparative example 2, and the rest is the same as example 1.
The raw materials in the examples and the comparative examples are mixed according to the proportion and then are uniformly stirred to obtain the gypsum-based caulking paste. The obtained gypsum-based caulking paste was subjected to a performance test according to the method in JCT 2075-.
Table 1: and (5) testing the performance of the caulking paste.
As can be seen from Table 1, the water absorption of the latex copolymer of styrene-butyl acrylate-silane coupling agent grafted by polydimethylsiloxane in examples 1-3, which is added with similar properties, is significantly improved and reduced compared with the latex copolymer of styrene-butyl acrylate-silane coupling agent grafted by polydimethylsiloxane in comparative example 1, which is not added with polydimethylsiloxane, and the addition of the latex copolymer of styrene-butyl acrylate-silane coupling agent grafted by polydimethylsiloxane in the present invention is proved to effectively improve the water resistance of the gypsum-based caulking agent.
In comparative example 2, when no bamboo fiber was added, the tensile strength was remarkably decreased as compared with example 1, which demonstrates that the tensile strength of the gypsum-based caulking paste can be improved by adding the plant short fiber.
Claims (10)
1. The waterproof gypsum-based caulking paste is characterized by comprising, by weight, 800-1000 parts of gypsum, 10-12 parts of plant short fibers with the length of 10-20 mm, 0.2-0.5 part of retarder, 2-4 parts of water-retaining agent, 1-8 parts of latex powder, 0.5-1.5 parts of anti-sagging agent, 3-5 parts of polydimethylsiloxane grafted styrene-butyl acrylate-silane coupling agent emulsion copolymer and 400-800 parts of water.
2. The waterproof gypsum-based caulk according to claim 1, wherein the polydimethylsiloxane-grafted styrene-butyl acrylate-silane coupling agent emulsion copolymer is prepared by a method comprising the steps of:
(1) dissolving alkylphenol polyoxyethylene and sodium bicarbonate in water, and stirring until the alkylphenol polyoxyethylene and the sodium bicarbonate are completely dissolved to obtain a base solution A;
(2) dissolving alkylphenol ethoxylates in water, stirring until the alkylphenol ethoxylates is completely dissolved, adding a styrene monomer, a butyl acrylate monomer, ammonium persulfate, a silane coupling agent and hydroxyl-terminated polydimethylsiloxane, and stirring for 20-30 min to obtain a pre-emulsion B;
(3) heating the base solution A to 60-70 ℃, adding 5-10% by mass of pre-emulsion B, heating to 75-80 ℃, and stirring for reaction for 30-60 min;
(4) adding propylene glycol and dibutyltin dilaurate into the product obtained in the step (3), uniformly stirring, then adding the rest pre-emulsion B, and stirring and reacting for 1-2 h at the temperature of 80-85 ℃;
(5) and cooling to room temperature, adjusting the pH value to 6-8 by using ammonia water, and filtering to obtain the polydimethylsiloxane grafted styrene-butyl acrylate-silane coupling agent emulsion copolymer.
3. The waterproof gypsum-based caulking paste as claimed in claim 2, wherein the mass ratio of alkylphenol ethoxylate, sodium bicarbonate and water in the step (1) is (2-6): 1: (60-70).
4. The waterproof gypsum-based caulking paste as claimed in claim 2, wherein the mass ratio of the alkylphenol ethoxylate and water in the step (2) to the mass in the step (1) is (1-2): 1.
5. the waterproof gypsum-based caulking paste according to claim 2 or 4, wherein the mass ratio of alkylphenol ethoxylates, styrene monomers, butyl acrylate monomers, ammonium persulfate, silane coupling agents and hydroxyl-terminated polydimethylsiloxane in the step (2) is (1-3): (22-23): (22-23): (0.2-0.3): 1: (1-3).
6. The waterproof gypsum-based caulking paste of claim 2, wherein the mass ratio of the propylene glycol and the dibutyltin dilaurate to the hydroxyl-terminated polydimethylsiloxane added in the step (4) is (4-10): 1: (100-200).
7. The waterproof gypsum-based caulking paste of claim 1, wherein the retarder is sodium citrate or sodium polyphosphate.
8. The waterproof gypsum-based caulk according to claim 1, wherein said water retaining agent is one of cellulose ether, carboxymethyl cellulose, and polyacrylamide.
9. The waterproof gypsum-based caulk according to claim 1, wherein said anti-sagging agent is a starch ether.
10. The waterproof gypsum-based caulking paste of claim 1, wherein the plant short fibers are one or more of wood fibers, bamboo fibers and cotton fibers.
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| KR101991420B1 (en) * | 2018-10-10 | 2019-06-20 | 하상우 | Cement Mortar Composition For Emergency Repair With Improved Strength and Durability And Method For Repairing And Reinforcing Concrete Structure Using The Same |
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Application publication date: 20200714 |