CN113213866B - Gypsum self-leveling material - Google Patents
Gypsum self-leveling material Download PDFInfo
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- CN113213866B CN113213866B CN202110318157.9A CN202110318157A CN113213866B CN 113213866 B CN113213866 B CN 113213866B CN 202110318157 A CN202110318157 A CN 202110318157A CN 113213866 B CN113213866 B CN 113213866B
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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
- C04B28/146—Calcium sulfate hemi-hydrate with a specific crystal form alpha-hemihydrate
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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
- C04B2111/60—Flooring 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
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The application discloses gypsum is from levelling material, gypsum is from levelling material's raw materials includes: main materials, chemical additives and catalytic enzymes; the main materials comprise gypsum clinker, aggregate and filler; the chemical auxiliary agent comprises a lignosulfonate water reducing agent, and also can comprise one or more of latex powder, a water-retaining agent, a retarder and a defoaming agent; the catalytic enzyme is laccase. The application discloses gypsum is from levelling material, through forming water-resistant chemical bond between each component, under the prerequisite of the waterproof material of organosilicon of not adding, gypsum is from levelling material's water proofness has great promotion.
Description
Technical Field
The present invention relates to building material and self-leveling material, and is especially one kind of self-leveling gypsum material and its preparation process.
Background
The gypsum self-leveling material is a material prepared and mixed by taking gypsum as a base material, aggregate and chemical additives, is mixed with water to form self-leveling mortar, has fluidity, and can be used for ground leveling, lifting and ground heating backfill. Compared with cement self-leveling materials, the gypsum self-leveling material has the advantages of low energy consumption and little pollution required by production, lighter weight, good heat preservation and fire resistance, warm and comfortable foot feel, and thus, the gypsum self-leveling material has a very wide application prospect.
However, the gypsum self-leveling material has poor water resistance, reduced strength after meeting water and reduced performance due to the large solubility and low softening coefficient of gypsum in water, so that the popularization and application of the gypsum self-leveling material are greatly limited. At present, the method for improving the self-leveling water resistance of the gypsum is mainly to add an organic silicon waterproof material into a self-leveling material.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the present application.
The application provides a water-resistant gypsum self-leveling material which has good fluidity and constructability after being mixed with water, has high strength, flatness, smoothness and small shrinkage rate after being hardened, and meanwhile, has higher water resistance and wide application prospect.
The catalyzing enzyme is added into the gypsum self-leveling material, so that water-resistant chemical bonds can be formed by coupling water reducing agents in the gypsum self-leveling material, and the water resistance of the gypsum self-leveling material is further improved.
The application provides a gypsum self-leveling material, the raw materials of gypsum self-leveling material include: main materials, chemical additives and catalytic enzymes;
the main materials comprise gypsum clinker, aggregate and filler;
the chemical auxiliary agent comprises a lignosulfonate water reducing agent, and also can comprise one or more of latex powder, a water-retaining agent, a retarder and a defoaming agent;
the catalytic enzyme is laccase.
In the gypsum self-leveling material provided by the embodiment of the application, the raw materials of the gypsum self-leveling material comprise the following components in parts by weight: 35 to 45 parts of gypsum clinker, 40 to 47 parts of aggregate and 15 to 18 parts of filler;
the dosage of the chemical auxiliary agent is 0 to 2 parts of latex powder, 0.1 to 0.12 part of lignosulfonate water reducing agent, 0 to 0.08 part of water-retaining agent, 0 to 0.012 part of retarder and 0 to 0.06 part of defoaming agent, based on 100 parts by weight of the main material; optionally, based on 100 parts by weight of the main material, the chemical auxiliary agents are used in an amount of 1 to 2 parts by weight of the latex powder, 0.03 to 0.08 part by weight of the water-retaining agent, 0.008 to 0.012 part by weight of the retarder and optionally 0.04 to 0.06 part by weight of the defoaming agent;
based on 100 parts by weight of the main material, 0.005-0.01 part of catalytic enzyme is used.
In the gypsum self-leveling material provided by the embodiment of the application, the aggregate is sand; optionally, the sand is selected from any one or more of ore sand or river sand.
In the gypsum self-leveling material provided in the examples herein, optionally, the filler is calcium carbonate powder.
In the gypsum self-leveling material provided by the embodiment of the application, the granularity of the aggregate is 40 meshes to 100 meshes; the particle size of the filler is 270 to 600 meshes.
In the gypsum self-leveling material provided in the embodiment of the application, the average particle size ratio of the aggregate to the filler is (6-9): 1.
In the gypsum self-leveling material provided by the embodiment of the application, the lignosulfonate-based water reducing agent is selected from any one or two of sodium lignosulfonate and calcium lignosulfonate.
In the gypsum self-leveling material provided by the embodiment of the application, the latex powder is selected from any one or more of vinyl acetate-ethylene copolymer and vinyl acetate homopolymer.
In the gypsum self-leveling material provided in the embodiment of the present application, optionally, the minimum film forming temperature of the latex powder is 0 ℃ to 4 ℃.
In the gypsum self-leveling material provided in the embodiments of the present application, optionally, the water retaining agent is cellulose ether.
In the gypsum self-leveling material provided in the examples herein, the cellulose ether has a viscosity of 300 to 1000 mpa-s.
In the gypsum self-leveling material provided by the embodiment of the application, the water retaining agent is selected from any one or two of hydroxyethyl cellulose ether and hydroxypropyl methyl cellulose ether.
In the gypsum self-leveling material provided in the embodiments of the present application, optionally, the retarder is a protein retarder.
In the gypsum self-leveling material provided in the embodiments herein, the defoamer is selected from polylol compounds.
In the gypsum self-leveling material provided by the embodiment of the application, the defoaming agent is selected from any one or two of vegetable oil polyglycol and polyethylene glycol.
In the gypsum self-leveling material provided by the embodiment of the application, the gypsum clinker is selected from any one or two of alpha crystal form hemihydrate gypsum and beta crystal form hemihydrate gypsum.
In the gypsum self-leveling material provided by the embodiment of the application, the weight ratio of the alpha crystal form hemihydrate gypsum to the beta crystal form hemihydrate gypsum is (2:1) - (1:1).
In the gypsum self-leveling material provided by the embodiment of the application, when the gypsum self-leveling material is used for preparing gypsum self-leveling mortar, the mass ratio of the gypsum self-leveling material to water is 1 (0.23-0.28).
In yet another aspect, the application provides the use of a lignosulfonate-based water reducing agent and a catalytic enzyme in a gypsum self-leveling material to improve the water resistance of the gypsum self-leveling material;
in the application provided by the embodiment of the application, the lignosulfonate-based water reducing agent is selected from any one or two of sodium lignosulfonate and calcium lignosulfonate;
in the applications provided in the examples herein, the catalytic enzyme is a laccase.
In the application provided by the embodiment of the application, the dosage of the lignosulfonate-based water reducing agent is 0.1wt.% to 0.12wt.% of the dosage of the main materials (gypsum clinker, aggregate and filler) in the raw material of the gypsum self-leveling material, and the dosage of the catalytic enzyme is 0.005wt.% to 0.01wt.% of the dosage of the main materials (gypsum clinker, aggregate and filler) in the raw material of the gypsum self-leveling material.
The catalytic enzyme that this application was added can make and take place the coupling effect between the water-reducing agent, forms water-resistant chemical bond, and under the prerequisite of not adding organosilicon waterproof material, the water resistance of gypsum self-leveling material has great promotion.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. Other advantages of the present application may be realized and attained by the invention in its aspects as described in the specification.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application are described in detail below. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The embodiment of the application provides a gypsum self-leveling material, the raw materials of gypsum self-leveling material include: main materials, chemical additives and catalytic enzymes;
the main materials comprise gypsum clinker, aggregate and filler;
the chemical auxiliary agent comprises a lignosulfonate water reducing agent, and also can comprise one or more of latex powder, a water-retaining agent, a retarder and a defoaming agent;
the catalytic enzyme is laccase.
In the embodiment of the application, the raw materials of the gypsum self-leveling material comprise the following components in parts by weight: 35 to 45 parts of gypsum clinker, 40 to 47 parts of aggregate and 15 to 18 parts of filler;
the dosage of the chemical auxiliary agent is 0 to 2 parts of latex powder, 0.1 to 0.12 part of lignosulfonate water reducing agent, 0 to 0.08 part of water-retaining agent, 0 to 0.012 part of retarder and 0 to 0.06 part of defoaming agent, based on 100 parts by weight of the main material; optionally, based on 100 parts by weight of the main material, the chemical auxiliary agents are used in an amount of 1 to 2 parts by weight of the latex powder, 0.03 to 0.08 part by weight of the water-retaining agent, 0.008 to 0.012 part by weight of the retarder and optionally 0.04 to 0.06 part by weight of the defoaming agent;
the catalytic enzyme accounts for 0.005 to 0.01 part by weight of 100 parts by weight of the main material.
In the embodiment of the application, the aggregate is sand; optionally, the sand is selected from any one or more of ore sand or river sand.
In embodiments of the present application, optionally, the filler is calcium carbonate powder.
In the embodiment of the application, the particle size of the aggregate is 40-100 meshes; the particle size of the filler is 270 to 600 meshes.
In the embodiment of the application, the average particle diameter ratio of the aggregate to the filler is (6-9): 1.
In the embodiment of the application, the lignosulfonate-based water reducing agent is selected from any one or two of sodium lignosulfonate and calcium lignosulfonate.
In the embodiment of the present application, the latex powder is selected from any one or more of a vinyl acetate-ethylene copolymer and a vinyl acetate homopolymer.
In the embodiment of the present application, optionally, the minimum film forming temperature of the latex powder is 0 ℃ to 4 ℃.
In embodiments herein, optionally, the water retaining agent is a cellulose ether.
In the examples herein, the cellulose ether has a viscosity of from 300 to 1000 mpa-s.
In embodiments of the present application, optionally, the retarder is a protein retarder.
In the examples herein, the defoamer is selected from the group of polymeric polyols.
In the examples of the present application, the retarder is a protein retarder.
In the embodiment of the application, the water retaining agent is selected from any one or two of hydroxyethyl cellulose ether and hydroxypropyl methyl cellulose ether.
In the embodiment of the application, the defoaming agent is selected from any one or two of vegetable oil polyglycol and polyethylene glycol.
In the embodiment of the application, the gypsum clinker is selected from any one or two of alpha crystal form hemihydrate gypsum and beta crystal form hemihydrate gypsum.
In the embodiment of the application, the weight ratio of the alpha crystal form hemihydrate gypsum to the beta crystal form hemihydrate gypsum is (2:1) - (1:1).
In the embodiment of the application, when the gypsum self-leveling material is used for preparing the gypsum self-leveling mortar, the mass ratio of the gypsum self-leveling material to water is 1 (0.23-0.28).
Example 1
The embodiment provides a water-resistant gypsum self-leveling material which is composed of a main material, a chemical auxiliary agent and catalytic enzyme. The main material consists of gypsum clinker, aggregate and filler; the chemical auxiliary agent consists of latex powder, a water reducing agent, a water-retaining agent, a retarder and a defoaming agent.
The latex powder is vinyl acetate-ethylene copolymer (the lowest film forming temperature is 4 ℃) and is purchased from Wacker chemical Co., ltd, and the mark is 5010N; the water reducing agent is sodium lignosulphonate purchased from Jinan ruin chemical company Limited; the water-retaining agent is hydroxyethyl cellulose ether (with the viscosity of 300mpa & s) which is purchased from Japan shin-Etsu company and has the brand number of MH300P2; the retarder is a vegetable protein retarder and is purchased from SISISIIT 2000 Italy, and the mark is P; the defoamer is vegetable oil polyglycol purchased from the German Mingling chemical group under the brand name P8850. The catalytic enzyme is laccase, and is purchased from Hibei Qiasheng Biotechnology Co. The proportion of each component in the embodiment is as follows:
35 parts of gypsum clinker, 47 parts of aggregate, 18 parts of filler, 2 parts of latex powder, 0.10 part of water reducing agent, 0.08 part of water retaining agent, 0.008 part of retarder, 0.04 part of defoaming agent and 0.005 part of catalytic enzyme.
The gypsum clinker is alpha crystal semi-hydrated gypsum. The aggregate is river sand with the granularity of 100 meshes. The filler is calcium carbonate with the granularity of 600 meshes. The average particle diameter ratio of the aggregate to the filler in the main material is 6.5.
The preparation method of the self-leveling material in the embodiment comprises the following steps: weighing the required raw materials according to the proportion of the formula, adding the raw materials into a stirrer, and uniformly mixing to form a product.
Example 2
The embodiment provides a water-resistant gypsum self-leveling material which is composed of a main material, a chemical auxiliary agent and catalytic enzyme. The main material consists of gypsum clinker, aggregate and filler; the chemical auxiliary agent consists of latex powder, a water reducing agent, a water-retaining agent, a retarder and a defoaming agent.
The latex powder is vinyl acetate homopolymer (the lowest film forming temperature is 0 ℃), and is purchased from Guangzhou field industry Co., ltd, and the mark DY5010; the water reducing agent is calcium lignosulfonate, and is purchased from Jinan Relin chemical industry Co., ltd; the water-retaining agent is hydroxypropyl methyl cellulose ether with the viscosity of 500mpa & s, is purchased from Longhu science and technology Limited and has the brand name of hpmc500; the retarder is a protein retarder and is purchased from sicit2000 with the trade mark of xcp; the main component of the defoaming agent is polyethylene glycol which is purchased from German Ming Ling and has the brand number of P803. The catalytic enzyme is polyphenol oxidase (laccase) containing 4 copper ions, and is purchased from Hippo Qiansheng Biotechnology Co., ltd. The proportion of each component in the embodiment is as follows:
40 parts of gypsum clinker, 44 parts of aggregate, 16 parts of filler, 1.5 parts of latex powder, 0.12 part of water reducing agent, 0.06 part of water-retaining agent, 0.01 part of retarder, 0.05 part of defoaming agent and 0.008 part of catalytic enzyme.
The weight ratio of the gypsum clinker to the mixture of the alpha crystal form hemihydrate gypsum and the beta crystal form hemihydrate gypsum is 2:1. The aggregate is river sand with the granularity of 70 meshes. The filler is calcium carbonate with the granularity of 500 meshes.
The average particle diameter ratio of the aggregate to the filler in the main material is 8.5.
The preparation method of the self-leveling material in the embodiment comprises the following steps: weighing the required raw materials according to the formula proportion, adding the raw materials into a stirrer, and uniformly mixing to form the product.
Example 3
The embodiment provides a dense and stacked gypsum self-leveling material which comprises a main material, a chemical auxiliary agent and catalytic enzyme. The main material consists of gypsum clinker, aggregate and filler; the chemical auxiliary agent consists of latex powder, a water reducing agent, a water-retaining agent, a retarder and a defoaming agent.
The chemical assistants in this example were the same as in example 1. The catalytic enzyme is polyphenol oxidase (laccase) containing 4 copper ions and is purchased from Hippo Qiansheng biological technology Co., ltd. The proportion of each component in the embodiment is as follows:
45 parts of gypsum clinker, 40 parts of aggregate, 15 parts of filler, 1.0 part of latex powder, 0.12 part of water reducing agent, 0.03 part of water-retaining agent, 0.012 part of retarder, 0.06 part of defoaming agent and 0.01 part of catalytic enzyme.
The gypsum clinker is alpha crystal semi-hydrated gypsum. The aggregate is river sand with the granularity of 40 meshes. The filler is calcium carbonate, and the granularity is 270 meshes. The average particle diameter ratio of the aggregate to the filler in the main material is 7.2.
The preparation method of the self-leveling material in the embodiment comprises the following steps: weighing the required raw materials according to the formula proportion, adding the raw materials into a stirrer, and uniformly mixing to form the product.
Comparative example 1
This comparative example differs from example 1 only in that: the remaining raw materials and preparation procedure were the same as in example 1 without addition of catalytic enzyme.
Comparative example 2
This comparative example differs from example 1 only in that: the water reducing agent is a polycarboxylic acid water reducing agent, and the rest of raw materials and the preparation process are the same as those in the example 1.
Comparative example 3
This comparative example prepared gypsum self-leveling using the method of example 1, with the difference compared to example 1: the same polycarboxylic acid water reducing agent in parts by weight as in example 1 lignosulfonate was used without catalytic enzyme and lignosulfonate water reducing agent, and 0.02 parts by weight of an organosilicon waterproofing agent purchased from longhu science co.
Performance testing
The gypsum self-levelling materials prepared in the above examples and comparative examples were mixed with water at a standard consistency using water to prepare self-levelling (weight ratio of gypsum self-levelling material to water 1.23-0.28.
And testing the self-leveling performance of the gypsum according to the Chinese building material industry standard JC/T1023-2007. The results are reported in Table 1.
TABLE 1 Gypsum self-leveling Performance test results
In addition, the softening coefficient of the gypsum self-leveling material is tested according to the Chinese building material industry standard JC/T698-2010, and is shown in Table 2.
TABLE 2 softening coefficient test results for gypsum self-leveling materials
| Item | Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Coefficient of softening | 0.87 | 0.89 | 0.89 | 0.65 | 0.68 | 0.82 |
As shown in tables 1 and 2, the gypsum self-leveling materials prepared in the examples of the present application have high strength and high softening coefficient, which indicates that the gypsum self-leveling materials have high water resistance.
Although the embodiments disclosed in the present application are described above, the descriptions are only for the convenience of understanding the present application, and are not intended to limit the present application. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims.
Claims (14)
1. The gypsum self-leveling material comprises the raw materials of a main material, a chemical auxiliary agent and catalytic enzyme;
the chemical auxiliary agent comprises a lignosulfonate water reducing agent;
the main material of the gypsum self-leveling material comprises 35 to 45 parts by weight of gypsum clinker, 40 to 47 parts by weight of aggregate and 15 to 18 parts by weight of filler;
the catalytic enzyme is laccase;
according to 100 parts by weight of the main material, 0.005 to 0.01 part of catalytic enzyme is added;
the granularity of the aggregate is 40 meshes to 100 meshes; the particle size of the filler is 270-600 meshes;
the average particle diameter ratio of the aggregate to the filler is (6-9) 1.
2. The gypsum self-leveling material of claim 1,
the chemical auxiliary agent also comprises latex powder, a water-retaining agent, a retarder and a defoaming agent;
the water-reducing agent comprises, by weight, 100 parts of main materials, 0 to 2 parts of latex powder, 0.1 to 0.12 part of lignosulfonate water reducing agent, 0 to 0.08 part of water-retaining agent, 0 to 0.012 part of retarder and 0 to 0.06 part of defoaming agent.
3. The gypsum self-leveling material according to claim 2, wherein the chemical additives are 1 to 2 parts by weight of latex powder, 0.03 to 0.08 part by weight of water-retaining agent, 0.008 to 0.012 part by weight of retarder and 0.04 to 0.06 part by weight of defoamer based on 100 parts by weight of main material.
4. The gypsum self-leveling material of claim 1, wherein the aggregate is sand; the sand is selected from any one or more of ore sand or river sand.
5. The gypsum self-leveling material of claim 1, wherein the filler is calcium carbonate powder.
6. The gypsum self-leveling material of any one of claims 1 to 5, wherein the lignosulfonate-based water reducing agent is selected from any one or both of sodium lignosulfonate and calcium lignosulfonate.
7. The gypsum self-leveling material of any one of claims 2 to 3, wherein the latex powder is selected from any one or more of a vinyl acetate-ethylene copolymer and a vinyl acetate homopolymer; the lowest film-forming temperature of the latex powder is 0-4 ℃;
the retarder is selected from protein retarders.
8. The gypsum self-leveling material of any one of claims 2 to 3, wherein the water retaining agent is a cellulose ether.
9. The gypsum self-leveling material of claim 8, wherein the cellulose ether has a viscosity of from 300 to 1000 mpa-s.
10. The gypsum self-leveling material of any one of claims 2 to 3, wherein the water retaining agent is selected from any one or both of hydroxyethyl cellulose ether and hydroxypropyl methyl cellulose ether.
11. The gypsum self-leveling material of any one of claims 2 to 3, wherein the defoamer is selected from polymeric polyols.
12. The gypsum self-leveling material of any one of claims 2 to 3, wherein the defoamer is selected from any one or both of vegetable oil polyglycol and polyethylene glycol.
13. The gypsum self-leveling material of any one of claims 1 to 5, wherein the gypsum clinker is selected from any one or both of alpha and beta crystalline hemihydrate gypsum.
14. The gypsum self-leveling material of claim 13, wherein the weight ratio of the alpha crystalline form hemihydrate gypsum to the beta crystalline form hemihydrate is from (2:1) to (1:1).
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| CN113213866B (en) * | 2021-03-25 | 2022-12-20 | 中建材创新科技研究院有限公司 | Gypsum self-leveling material |
| CN114105586B (en) * | 2021-11-18 | 2023-03-17 | 中建材创新科技研究院有限公司 | Gypsum self-leveling material |
| CN116283185A (en) * | 2023-03-16 | 2023-06-23 | 安徽皖科新科技发展有限公司 | Special floor heating mortar and preparation method thereof |
| CN116655329B (en) * | 2023-06-13 | 2024-02-02 | 德州科顺建筑材料有限公司 | Composition for preparing waterproof mortar, preparation method and application thereof |
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| JPS54121297A (en) * | 1978-03-14 | 1979-09-20 | Ajinomoto Co Inc | Manufacture of alpha-type semihydrate gypsum and crystallization medium for alpha-type semihydrate gypsum manufacture |
| JP2011184230A (en) * | 2010-03-08 | 2011-09-22 | Forestry & Forest Products Research Institute | Lignin-based concrete admixture |
| CN106431146A (en) * | 2016-10-09 | 2017-02-22 | 南京工业大学 | Composite gypsum-based self-leveling mortar and preparation method |
| CN111592309A (en) * | 2019-04-29 | 2020-08-28 | 中建材创新科技研究院有限公司 | Heat-preservation gypsum self-leveling mortar and preparation method thereof |
| CN111606676B (en) * | 2019-06-21 | 2022-05-17 | 中建材创新科技研究院有限公司 | High-water-retention gypsum self-leveling material and preparation method thereof |
| CN111606685B (en) * | 2020-04-30 | 2021-06-22 | 北新集团建材股份有限公司 | Gypsum self-leveling material and preparation method thereof |
| CN111559922B (en) * | 2020-05-29 | 2021-06-29 | 北新集团建材股份有限公司 | High-strength high-toughness paper-surface gypsum board and preparation method thereof |
| CN113213866B (en) * | 2021-03-25 | 2022-12-20 | 中建材创新科技研究院有限公司 | Gypsum self-leveling material |
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