CN113527592A - Polycarboxylic acid water reducer for gypsum-based self-leveling mortar and preparation method and use method thereof - Google Patents
Polycarboxylic acid water reducer for gypsum-based self-leveling mortar and preparation method and use method thereof Download PDFInfo
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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
- C08F283/06—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals
- C08F283/065—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals on to unsaturated polyethers, polyoxymethylenes or polyacetals
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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
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2688—Copolymers containing at least three different monomers
- C04B24/2694—Copolymers containing at least three different monomers containing polyether side chains
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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
- C04B28/145—Calcium sulfate hemi-hydrate with a specific crystal form
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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
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/302—Water reducers
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention discloses a polycarboxylic acid water reducer for gypsum-based self-leveling mortar, and a preparation method and a use method thereof, wherein the polycarboxylic acid water reducer comprises the following components in parts by weight: 100 parts of polyether, 6-10 parts of acrylic acid, 1-2 parts of fumaric acid, 0.2-1 part of methyl acrylate, 0.2-1 part of butyl acrylate, 0.5-2 parts of dimethyl diallyl ammonium chloride, 0.01-0.05 part of diethylene glycol divinyl ether, 0.01-0.05 part of triethylene glycol divinyl ether, 2-5 parts of hydrogen peroxide, 0.1 part of reducing agent E510.02, 60.02-0.1 part of reducing agent FF, 0.001-0.005 part of ferrous sulfate, 0.01-0.05 part of mercaptopropionic acid, 0.01-0.05 part of mercaptoacetic acid, 0.01-0.05 part of mercaptoethanol, 0.5-2.5 parts of sodium hypophosphite, 12-20 parts of sodium hydroxide and 80-160 parts of water. The polycarboxylic acid water reducer has good adaptability to byproduct gypsum, high water reducing rate, good slump retaining effect, quick setting, small shrinkage and high strength, and can be widely applied to the field of gypsum-based self-leveling mortar.
Description
Technical Field
The invention relates to the technical field of water reducing agents, in particular to a polycarboxylic acid water reducing agent for gypsum-based self-leveling mortar, and a preparation method and a use method thereof.
Background
The gypsum-based self-leveling mortar is also called self-leveling gypsum and self-leveling ground leveling gypsum, and is a dry powder mortar specially used for leveling indoor ground, which is prepared by carefully preparing and uniformly mixing gypsum materials, special fillers and various building chemical additives in a factory. The gypsum-based self-leveling mortar has the advantages of high construction speed, high efficiency, simple process, low labor intensity and the like, and the gypsum-based self-leveling hardened floor has certain elasticity, warm and comfortable foot feel, certain sound insulation effect and good heat insulation performance and is beneficial to building energy conservation. Meanwhile, with the rapid development of the industries such as phosphate fertilizer, chlor-alkali, calcium desulphurization and the like in China, the output of various industrial by-product gypsum is huge, and the industrial by-product gypsum has the disadvantages of high impurity, unstable components and the like, so that the product production by replacing natural gypsum with the industrial by-product gypsum has low enthusiasm and relatively lags in technology. The method has the advantages of high efficiency, environmental protection, sustainable utilization of industrial byproduct gypsum, resource utilization, high economic added value and wide market application.
Compared with traditional high-efficiency water reducing agents such as naphthalene water reducing agents, the polycarboxylic acid high-performance water reducing agent has a plurality of unique technical performance advantages: the mixing amount is low, and the water reducing rate is high; the fluidity of the concrete and mortar mixture is well maintained; the compatibility with cement is good; the prepared concrete has small shrinkage rate, and is beneficial to improving the volume stability and durability of the concrete; the production and use process is environment-friendly and pollution-free, and belongs to a green additive. However, due to the adaptability problem of the byproduct gypsum and the water reducing agent, the initial fluidity of the self-leveling mortar is small, the fluidity loss is too large in 30min, and the initial setting time or the final setting time cannot meet the standard requirement, so that a polycarboxylic acid water reducing agent for gypsum-based self-leveling mortar with good adaptability is urgently needed to solve the construction problem.
Disclosure of Invention
Aiming at the defect of poor adaptability of a polycarboxylic acid water reducing agent and byproduct gypsum in the prior art, the invention provides the polycarboxylic acid water reducing agent for the gypsum-based self-leveling mortar, and a preparation method and a use method thereof.
The technical scheme adopted by the invention for solving the technical problem is as follows: a polycarboxylic acid water reducing agent for gypsum-based self-leveling mortar comprises the following components in parts by weight: 100 parts of polyether, 6-10 parts of acrylic acid, 1-2 parts of fumaric acid, 0.2-1 part of methyl acrylate, 0.2-1 part of butyl acrylate, 0.5-2 parts of dimethyl diallyl ammonium chloride, 0.01-0.05 part of diethylene glycol divinyl ether, 0.01-0.05 part of triethylene glycol divinyl ether, 2-5 parts of hydrogen peroxide, 0.1 part of reducing agent E510.02, 60.02-0.1 part of reducing agent FF, 0.001-0.005 part of ferrous sulfate, 0.01-0.05 part of mercaptopropionic acid, 0.01-0.05 part of mercaptoacetic acid, 0.01-0.05 part of mercaptoethanol, 0.5-2.5 parts of sodium hypophosphite, 12-20 parts of sodium hydroxide and 80-160 parts of water.
Further, the polyether comprises one or more of ethylene glycol vinyl polyoxyethylene ether, diethylene glycol vinyl polyoxyethylene ether and 4-hydroxybutyl vinyl polyoxyethylene ether, and the number average molecular weight of the polyether is 1000-6000.
Preferably, the polycarboxylic acid water reducing agent comprises the following components in parts by weight: 100 parts of polyether, 7-9 parts of acrylic acid, 1.2-1.8 parts of fumaric acid, 0.4-0.8 part of methyl acrylate, 0.4-0.8 part of butyl acrylate, 1.0-1.5 parts of dimethyl diallyl ammonium chloride, 0.02-0.04 part of diethylene glycol divinyl ether, 0.02-0.04 part of triethylene glycol divinyl ether, 3-4 parts of dioxy, 0.26-0.08 part of reducing agent E510.04, 0.25-0.08 part of reducing agent FF 60.04, 0.002-0.004 part of ferrous sulfate, 0.02-0.04 part of mercaptopropionic acid, 0.02-0.045 part of mercaptoacetic acid, 0.02-0.04 part of mercaptoethanol, 1.0-2.0 parts of sodium hypophosphite, 14-18 parts of sodium hydroxide and 100-140 parts of water.
The polycarboxylic acid water reducing agent is colorless to light yellow transparent liquid, wherein the concentration of effective active ingredients is generally 40-60%.
A preparation method of a polycarboxylic acid water reducer for gypsum-based self-leveling mortar comprises the following steps:
step 1), adding the mixed solution A and the mixed solution B into the backing material C at a certain temperature and in a stirring state, and carrying out polymerization reaction; the mixed solution A comprises the following components in parts by weight: 6-10 parts of acrylic acid, 1-2 parts of fumaric acid, 0.5-2 parts of dimethyl diallyl ammonium chloride, 0.01-0.05 part of diethylene glycol divinyl ether, 0.01-0.05 part of triethylene glycol divinyl ether, 0.01-0.05 part of mercaptopropionic acid, 0.01-0.05 part of mercaptoacetic acid, 0.01-0.05 part of mercaptoethanol and 10-30 parts of water; the mixed solution B comprises the following components in parts by weight: reducing agent E510.02-0.1 part, reducing agent FF 60.02-0.1 part and water 20-40 parts; the bottom material C comprises the following components in parts by weight: 100 parts of polyether, 0.2-1 part of methyl acrylate, 0.2-1 part of butyl acrylate, 0.5-2.5 parts of sodium hypophosphite, 2-5 parts of hydrogen peroxide, 0.001-0.005 part of ferrous sulfate and 50-90 parts of water;
and 2) adjusting the pH value of the material after the polymerization reaction to 11.0-13.0 by using 12-20 parts by weight of sodium hydroxide to obtain the polymer.
Further, the adding time of the mixed liquid B is earlier than that of the mixed liquid A, the mixed liquid A is added at a constant speed within 10-50 min, and the mixed liquid B is added at a constant speed within 20-60 min.
Further, the preparation temperature of the water reducing agent is 0-20 ℃.
Preferably, the preparation temperature of the water reducing agent is preferably 0-10 ℃.
The preferable conditions for each component in the mixed solution A, the mixed solution B and the base C are as described above. According to the common knowledge in the field, the mixed solution A, the mixed solution B and the base material C are respectively mixed to be uniform before use.
In the preferred embodiment, the preparation process is carried out without protection by an inert atmosphere.
In step (1), the method of addition may be a method conventional in the art. The mode of addition is preferably dropwise. The mixed solution A and the mixed solution B are more preferably dropped into the base material C from a head tank A and a head tank B, respectively. The condition that the adding time of the mixed liquid B is earlier than that of the mixed liquid A means that the adding time of the mixed liquid B is earlier than that of the mixed liquid A at the initial adding time, and does not mean that the mixed liquid A is added after the mixed liquid B is added, and the mixed liquid A can be added after 5-10 min of the mixed liquid B is added. Preferably, the adding speed of the mixed liquid A is based on the completion of adding within 10-50 min, and the adding speed of the mixed liquid B is based on the completion of adding within 20-60 min.
In step (1), the polymerization method and conditions may be those conventional in the art for such polymerization. The following methods and conditions are preferred in the present invention: the polymerization reaction is preferably carried out in a polymerization reactor. Preferably, after the mixed solution A and the mixed solution B are added, curing reaction is carried out for 30-90 min; further preferably, the reaction is continued for 45-75 min.
In the step (2), the feed liquid is uniformly mixed while adjusting the pH value of the material after the polymerization reaction, according to the common knowledge in the art.
A method for using a polycarboxylic acid water reducer for gypsum-based self-leveling mortar comprises the steps of mixing the prepared polycarboxylic acid water reducer with the gypsum-based self-leveling mortar; the gypsum-based self-leveling mortar comprises the following components in parts by weight: 180-220 parts of industrial paragypsum, 180-200 parts of semi-hydrated gypsum, 50-60 parts of cement, 150-170 parts of stone powder, 50-70 parts of silica fume, 10-20 parts of calcium oxide, 10-20 parts of redispersible latex powder, 0.8-1.2 parts of defoaming agent, 0.8-1.2 parts of air entraining agent, 1-1.2 parts of tartaric acid and 160-200 parts of water; the addition amount of the polycarboxylic acid water reducing agent is 1-2 parts.
In the polycarboxylic acid water reducing agent provided by the invention, the polyether contains ether bond C-O-C, the activity of the polyether is high, and the polyether can be rapidly polymerized with small monomers such as acrylic acid, fumaric acid and the like at low temperature; the reaction time is greatly shortened, the molecular weight distribution width of the polycarboxylic acid water reducing agent can be reduced, and the water reducing effect is better; in addition, the methyl acrylate and the butyl acrylate contain ester groups, and the synthesized water reducing agent can release carboxyl in the alkaline environment of the gypsum-based self-leveling mortar, so that a good slump retaining effect is achieved; the amino group in the dimethyl diallyl ammonium chloride can promote the condensation of the gypsum-based material; the two ends of the diethylene glycol divinyl ether and the triethylene glycol divinyl ether both contain C ═ C double bonds, so that the effect of a cross-linking agent can be achieved, the length of the main chain of the water reducing agent is increased, and the product is guaranteed to have better water reducing and slump retaining effects.
The invention has the beneficial effects that: (1) the polycarboxylic acid water reducing agent disclosed by the invention breaks through the existing reaction temperature, has a good effect on the water reducing agent synthesized at a lower temperature, is short in synthesis reaction time, and has good economic benefits. (2) When the addition amount of the polycarboxylic acid water reducer in the gypsum-based self-leveling mortar is 1-2, the initial fluidity of the gypsum-based self-leveling mortar is 150-170 mm, the fluidity in 30min is 154-170 mm, the initial setting time is 1.8-2.2 h, the final setting time is 4-5 h, the 28d dimensional change rate is 0.01-0.05%, the 3d flexural strength is 4-6 MPa, the 28d flexural strength is 8-10 MPa, the 3d compressive strength is 25-30 MPa, the 28d compressive strength is 60-80 MPa, and the tensile bonding strength is 3-4 MPa. (3) Carboxyl, ester group and amino are simultaneously introduced into the polycarboxylic acid water reducing agent, so that the adaptability of the water reducing agent and gypsum is improved, and meanwhile, a cross-linking agent is added, so that the length of a main chain is improved, and the water reducing and slump retaining effects of a product are ensured; has good adaptability to industrial by-product gypsum and provides support for the mass use of the industrial by-product gypsum. (4) The polycarboxylic acid water reducing agent can be widely applied to various gypsum-based self-leveling mortars.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
A preparation method of a polycarboxylic acid water reducing agent comprises the following steps:
(1) dropwise adding the solution A and the solution B into a polymerization reaction kettle into which the base material C is added at 0 ℃ under a stirring state to perform polymerization reaction, wherein the polymerization reaction time is based on continuous curing reaction for 90min after the dropwise adding of the solution A and the solution B is completed;
the adding time of the solution B is earlier than that of the solution A, the dropwise adding speed of the solution A is based on 10min constant-speed addition, and the dropwise adding speed of the solution B is based on 20min constant-speed addition; the composition in solution a was: 10 parts of acrylic acid, 1 part of fumaric acid, 0.5 part of dimethyl diallyl ammonium chloride, 0.01 part of diethylene glycol divinyl ether, 0.01 part of triethylene glycol divinyl ether, 0.01 part of mercaptopropionic acid, 0.01 part of mercaptoacetic acid, 0.01 part of mercaptoethanol and 10 parts of water; the composition in solution B was: 510.02 parts of reducing agent E, 60.1 parts of reducing agent FF and 20 parts of water; the composition of the bottom material C is as follows: 100 parts of ethylene glycol vinyl polyoxyethylene ether with the number average molecular weight of 1000, 0.2 part of methyl acrylate, 1 part of butyl acrylate, 2.5 parts of sodium hypophosphite, 5 parts of hydrogen peroxide, 0.001 part of ferrous sulfate and 50 parts of water; the solution A, the solution B and the base material C are mixed to be uniform before use;
(2) and (3) adjusting the pH value of the material after the polymerization reaction to 13.0 by using 20 parts of sodium hydroxide to obtain the polymer.
And (3) carrying out performance measurement on the prepared polycarboxylic acid water reducing agent, wherein the gypsum-based self-leveling mortar test refers to JC/T1023-2007 Gypsum-based self-leveling mortar.
Through detection, the polycarboxylic acid water reducer 2 is added into the gypsum-based self-leveling mortar, the initial fluidity of the gypsum-based self-leveling mortar is 150mm, the fluidity in 30min is 154mm, the initial setting time is 2.2h, the final setting time is 5h, the 28d dimensional change rate is 0.01 percent, the temperature is 3 ℃ and the tensile bonding strength is 3 MPa.
Examples 2 to 5
A polycarboxylic acid-based water-reducing agent was prepared according to the method and procedure of example 1, according to the formulation and operating parameters of Table 1.
TABLE 1
The polycarboxylic acid water reducing agents obtained in the above examples 1 to 5 were added to gypsum-based self-leveling mortar, and the performances thereof were examined.
As in table 2 below.
Wherein the comparative example 1 is provided by Naphthy water reducer sold in the market, Weifang Yingda chemical Limited; comparative example 2 is a commercially available polycarboxylic acid water reducing agent ZJ-8300, provided by Jiangsu Megaku building materials science and technology Co.
The results of performance tests on the polycarboxylic acid water-reducing agents obtained in examples 1 to 5 are shown in Table 2. As can be seen from Table 2, when the polycarboxylic acid water reducer is added into gypsum-based self-leveling mortar in an amount of 1-2, the initial fluidity of the gypsum-based self-leveling mortar is 150-170 mm, the fluidity at 30min is 154-170 mm, the initial setting time is 1.8-2.2 h, the final setting time is 4-5 h, the 28d dimensional change rate is 0.01-0.05%, the 3d flexural strength is 4-6 MPa, the 28d flexural strength is 8-10 MPa, the 3d compressive strength is 25-30 MPa, the 28d compressive strength is 60-80 MPa, and the tensile bonding strength is 3-4 MPa. The polycarboxylic acid water reducer prepared by the invention has good use effect in gypsum-based self-leveling mortar, and is superior to the water reducer sold in the market.
The above embodiments are only for illustrating the invention and are not to be construed as limiting the invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention, therefore, all equivalent technical solutions also belong to the scope of the invention, and the scope of the invention is defined by the claims.
Claims (9)
1. The polycarboxylic acid water reducer for the gypsum-based self-leveling mortar is characterized by comprising the following components in parts by weight: 100 parts of polyether, 6-10 parts of acrylic acid, 1-2 parts of fumaric acid, 0.2-1 part of methyl acrylate, 0.2-1 part of butyl acrylate, 0.5-2 parts of dimethyl diallyl ammonium chloride, 0.01-0.05 part of diethylene glycol divinyl ether, 0.01-0.05 part of triethylene glycol divinyl ether, 2-5 parts of hydrogen peroxide, 0.1 part of reducing agent E510.02, 60.02-0.1 part of reducing agent FF, 0.001-0.005 part of ferrous sulfate, 0.01-0.05 part of mercaptopropionic acid, 0.01-0.05 part of mercaptoacetic acid, 0.01-0.05 part of mercaptoethanol, 0.5-2.5 parts of sodium hypophosphite, 12-20 parts of sodium hydroxide and 80-160 parts of water.
2. The polycarboxylic acid water reducer for gypsum-based self-leveling mortar of claim 1, which is characterized in that: the polyether comprises one or more of ethylene glycol vinyl polyoxyethylene ether, diethylene glycol vinyl polyoxyethylene ether and 4-hydroxybutyl vinyl polyoxyethylene ether, and the number average molecular weight of the polyether is 1000-6000.
3. The polycarboxylic acid water reducer for gypsum-based self-leveling mortar of claim 1, which comprises the following components in parts by weight: 100 parts of polyether, 7-9 parts of acrylic acid, 1.2-1.8 parts of fumaric acid, 0.4-0.8 part of methyl acrylate, 0.4-0.8 part of butyl acrylate, 1.0-1.5 parts of dimethyl diallyl ammonium chloride, 0.02-0.04 part of diethylene glycol divinyl ether, 0.02-0.04 part of triethylene glycol divinyl ether, 3-4 parts of dioxy, 0.26-0.08 part of reducing agent E510.04, 0.25-0.08 part of reducing agent FF 60.04, 0.002-0.004 part of ferrous sulfate, 0.02-0.04 part of mercaptopropionic acid, 0.02-0.045 part of mercaptoacetic acid, 0.02-0.04 part of mercaptoethanol, 1.0-2.0 parts of sodium hypophosphite, 14-18 parts of sodium hydroxide and 100-140 parts of water.
4. The preparation method of the polycarboxylic acid water reducer for the gypsum-based self-leveling mortar is characterized by comprising the following steps of:
step 1), adding the mixed solution A and the mixed solution B into the backing material C at a certain temperature and in a stirring state, and carrying out polymerization reaction; the mixed solution A comprises the following components in parts by weight: 6-10 parts of acrylic acid, 1-2 parts of fumaric acid, 0.5-2 parts of dimethyl diallyl ammonium chloride, 0.01-0.05 part of diethylene glycol divinyl ether, 0.01-0.05 part of triethylene glycol divinyl ether, 0.01-0.05 part of mercaptopropionic acid, 0.01-0.05 part of mercaptoacetic acid, 0.01-0.05 part of mercaptoethanol and 10-30 parts of water; the mixed solution B comprises the following components in parts by weight: reducing agent E510.02-0.1 part, reducing agent FF 60.02-0.1 part and water 20-40 parts; the bottom material C comprises the following components in parts by weight: 100 parts of polyether, 0.2-1 part of methyl acrylate, 0.2-1 part of butyl acrylate, 0.5-2.5 parts of sodium hypophosphite, 2-5 parts of hydrogen peroxide, 0.001-0.005 part of ferrous sulfate and 50-90 parts of water;
and 2) adjusting the pH value of the material after the polymerization reaction to 11.0-13.0 by using 12-20 parts by weight of sodium hydroxide to obtain the polymer.
5. The preparation method of the polycarboxylic acid water reducer for gypsum-based self-leveling mortar according to claim 4, characterized by comprising the following steps: the adding time of the mixed liquid B is earlier than that of the mixed liquid A, the mixed liquid A is added at a constant speed within 10-50 min, and the mixed liquid B is added at a constant speed within 20-60 min.
6. The preparation method of the polycarboxylic acid water reducer for gypsum-based self-leveling mortar according to claim 4, characterized by comprising the following steps: in the step 1), after the mixed solution A and the mixed solution B are added dropwise, continuing to perform curing reaction for 30-90 min.
7. The preparation method of the polycarboxylic acid water reducer for gypsum-based self-leveling mortar according to claim 4, characterized by comprising the following steps: the preparation temperature of the water reducing agent is 0-20 ℃.
8. The preparation method of the polycarboxylic acid water reducer for gypsum-based self-leveling mortar of claim 6, which is characterized by comprising the following steps: the preparation temperature of the water reducing agent is preferably 0-10 ℃.
9. A use method of a polycarboxylic acid water reducer for gypsum-based self-leveling mortar is characterized by comprising the following steps: the application method comprises the steps of mixing the prepared polycarboxylic acid water reducer with gypsum-based self-leveling mortar; the gypsum-based self-leveling mortar comprises the following components in parts by weight: 180-220 parts of industrial paragypsum, 180-200 parts of semi-hydrated gypsum, 50-60 parts of cement, 150-170 parts of stone powder, 50-70 parts of silica fume, 10-20 parts of calcium oxide, 10-20 parts of redispersible latex powder, 0.8-1.2 parts of defoaming agent, 0.8-1.2 parts of air entraining agent, 1-1.2 parts of tartaric acid and 160-200 parts of water; the addition amount of the polycarboxylic acid water reducing agent is 1-2 parts.
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| CN113956407A (en) * | 2021-11-08 | 2022-01-21 | 连云港石化有限公司 | Modified polyether macromonomer and preparation method and use method thereof |
| CN114085335A (en) * | 2021-11-17 | 2022-02-25 | 重庆建研科之杰新材料有限公司 | Water-reducing polycarboxylate superplasticizer with vinyl ether ester mixed structure and preparation method thereof |
| CN114085299A (en) * | 2021-12-07 | 2022-02-25 | 连云港石化有限公司 | Catalyst for synthesizing water reducing agent and preparation method and use method thereof |
| CN114316157A (en) * | 2022-02-08 | 2022-04-12 | 贵州万为金科特种建材有限公司 | Green environment-friendly water reducing agent |
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| CN113956407A (en) * | 2021-11-08 | 2022-01-21 | 连云港石化有限公司 | Modified polyether macromonomer and preparation method and use method thereof |
| CN113956407B (en) * | 2021-11-08 | 2023-03-07 | 连云港石化有限公司 | Modified polyether macromonomer and preparation method and use method thereof |
| CN114085335A (en) * | 2021-11-17 | 2022-02-25 | 重庆建研科之杰新材料有限公司 | Water-reducing polycarboxylate superplasticizer with vinyl ether ester mixed structure and preparation method thereof |
| CN114085299A (en) * | 2021-12-07 | 2022-02-25 | 连云港石化有限公司 | Catalyst for synthesizing water reducing agent and preparation method and use method thereof |
| CN114316157A (en) * | 2022-02-08 | 2022-04-12 | 贵州万为金科特种建材有限公司 | Green environment-friendly water reducing agent |
| CN114316157B (en) * | 2022-02-08 | 2023-10-31 | 淮北旭日新材料股份有限公司 | Environment-friendly water reducer |
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