CN113105203A - Preparation and use method of dry-mixed light gypsum-based self-leveling - Google Patents
Preparation and use method of dry-mixed light gypsum-based self-leveling Download PDFInfo
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- CN113105203A CN113105203A CN202110420488.3A CN202110420488A CN113105203A CN 113105203 A CN113105203 A CN 113105203A CN 202110420488 A CN202110420488 A CN 202110420488A CN 113105203 A CN113105203 A CN 113105203A
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- gypsum
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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
- C04B28/147—Calcium sulfate hemi-hydrate with a specific crystal form beta-hemihydrate
-
- 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
- C04B2111/40—Porous or lightweight materials
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- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the field of building decoration materials, and discloses a preparation and use method of dry-mixed light gypsum-based self-leveling, which comprises alpha semi-hydrated gypsum, beta semi-hydrated gypsum and fine aggregate, wherein the alpha semi-hydrated gypsum, the beta semi-hydrated gypsum and the fine aggregate form gypsum-based self-leveling; the light gypsum base has the excellent characteristics of good self-leveling fluidity, controllable setting time, strength meeting the standard requirement, small shrinkage, good alkali resistance, light weight, sound insulation, heat preservation, moisture preservation and the like; the gypsum self-leveling gypsum board is prepared by adding a certain proportion of alkaline cementing materials, a water reducing agent, a stabilizing agent, a defoaming agent, a retarder, polyvinyl alcohol, latex powder and the like and uniformly mixing, provides excellent additional performance, greatly improves the additional value of gypsum-based self-leveling, and has the excellent characteristics of good fluidity, controllable setting time, strength meeting the standard requirement, small shrinkage, good alkali resistance, light weight, sound insulation, heat preservation, moisture preservation and the like.
Description
Technical Field
The invention relates to the field of building decoration materials, in particular to a preparation and use method of dry-mixed light gypsum-based self-leveling.
Background
The gypsum-based self-leveling mortar is prepared by modifying semi-hydrated gypsum, an alkaline cementing material and aggregate by different additives and uniformly mixing the modified semi-hydrated gypsum, the alkaline cementing material and the aggregate in a professional factory; at present, JC/T1023-2007 Gypsum-based self-leveling mortar is established in the building material industry.
The gypsum-based self-leveling can be divided into alpha-semi-hydrated gypsum sand-type self-leveling and beta-semi-hydrated gypsum type sand-free self-leveling according to aggregate; the water-based paint is prepared by adding a certain proportion of alkaline cementing materials, water reducing agents, stabilizing agents, defoaming agents, retarders, polyvinyl alcohol, latex powder and the like and uniformly mixing. Because the admixtures are various and the weighing precision and the error range of different admixtures are different, but the admixtures are common building material products, the essence of gypsum-based self-leveling is the semi-hydrated gypsum modification and production technology.
In the prior art, the alpha-semi-hydrated gypsum in China is basically used for ceramic moulds due to low yield and complex production process of high-quality natural gypsum, the yield and sales of the self-leveling gypsum are extremely small, and the quality supervision still falls into the blank. As the physical and mechanical index established in JC/T1023-2007 is the lowest value of corresponding foreign standards, some manufacturers adopt building gypsum to produce sand-type self-leveling gypsum, and the quality of the self-leveling gypsum is close to the physical and mechanical properties of JC/T1023-2007 simply by increasing the dosage of the additive. The self-leveling gypsum sold in China is high in price and disordered in market, and is difficult to popularize and apply.
Disclosure of Invention
Technical problem to be solved
The invention provides a preparation and use method of dry-mixed light gypsum-based self-leveling, which has the advantages that the initial fluidity and the fluidity loss meet the construction requirements, the surface strength and the shrinkage rate are better, the absolute dry density is greatly reduced compared with the common gypsum-based self-leveling, and the like, solves the problems of layering, bleeding, hollowing, cracking and the like, and improves the added value of gypsum-based self-leveling products.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: the preparation method of the dry-mixed light-weight gypsum-based self-leveling agent comprises alpha semi-hydrated gypsum, beta semi-hydrated gypsum and fine aggregate, wherein the alpha semi-hydrated gypsum, the beta semi-hydrated gypsum and the fine aggregate form the gypsum-based self-leveling agent, the fineness of the fine aggregate of the gypsum-based self-leveling agent is 40-70 meshes and 70-140 meshes, and the volume weight is 20-120kg/m3。
Preferably, the volume ratio of the fine aggregate fineness of 40-70 meshes to the light aggregate fineness of 70-140 meshes is 1: 2-4.
Preferably, the gypsum-based self-leveling agent further comprises a cementing material and an additive, wherein the cementing material comprises: beta hemihydrate gypsum, an alkaline cementing material, a filler and a high-activity cementing material, wherein the additive comprises: water reducing agent, air entraining agent, defoaming agent, retarder, stabilizer, polyvinyl alcohol and redispersible latex powder.
Preferably, the weight ratio of the gypsum-based self-leveling powder material is 100%, the mass of the alpha semi-hydrated gypsum is 80-90%, the mass of the beta semi-hydrated gypsum is 0-10%, the mass of the alkaline cementing material is 1-7%, the mass of the high-activity cementing material is 3-8%, the mass of the filler is 0-4%, the mass of the water reducing agent is 0.3-0.8%, the mass of the air entraining agent is 0.01-0.05%, the mass of the defoaming agent is 0.05-0.2%, the mass of the retarder is 0.08-0.5%, the mass of the stabilizer is 0.06-0.5%, the mass of the polyvinyl alcohol is 0.1-0.5%, and the mass of the redispersible latex powder is 0.3-1.0%.
Preferably, the lightweight aggregate is one or more of expanded perlite, vitrified micro bubbles, polyurethane particles and polyphenyl particles.
Preferably, the mass-to-volume ratio of the lightweight gypsum-based self-leveling powder to the lightweight aggregate is 10 kg: 3-7L.
A preparation and use method of dry-mixed light gypsum-based self-leveling is characterized in that all powder materials in the claim 2 are uniformly mixed, and then light aggregate is uniformly mixed according to the proportion in the claim 3; wherein the powder material is stirred for 5-8min, and the light aggregate and the powder material are mixed for 1-2 min.
Preferably, the lightweight gypsum base in the method according to claim 5 is self-leveling, in the construction process, water is weighed according to the water requirement of standard consistency, all water is placed in a stirrer, the stirrer is opened, the powder is gradually added, stirring is continued for 3-5min after the powder is added, the stirring is performed for 5-10min for defoaming and curing operation of the lightweight gypsum base self-leveling, stirring is performed for 1-2min, the stirring is completed, then the lightweight gypsum base is spread to the construction part, and construction is performed according to the gypsum base self-leveling construction specification.
Preferably, the first and second liquid crystal materials are,
the alkaline cementing material is selected from one or more of lime calcium, portland cement and sulphoaluminate cement;
the high-activity cementing material is selected from one or more of silica fume and mineral powder;
the filler is selected from one or more of heavy calcium carbonate and fly ash;
the water reducing agent is selected from one or more of a melamine water reducing agent and a polycarboxylic acid water reducing agent;
the air entraining agent is selected from one or more of natural extraction modified air entraining agent and chemical synthesis air entraining agent;
the defoaming agent is an organic silicon defoaming agent;
the retarder is selected from one or more of inorganic acid, organic acid, protein and amino acid;
the stabilizer is selected from one or more of hydroxypropyl methyl cellulose and suspension stabilizer;
the polyvinyl alcohol has an average polymerization degree of 2400 and an alcoholysis degree of 88.
(III) advantageous effects
Compared with the prior art, the invention provides a preparation and use method of dry-mixed light gypsum-based self-leveling, which has the following beneficial effects:
the light gypsum base has the excellent characteristics of good self-leveling fluidity, controllable setting time, strength meeting the standard requirement, small shrinkage, good alkali resistance, light weight, sound insulation, heat preservation, moisture preservation and the like; the water-based paint is prepared by adding a certain proportion of alkaline cementing materials, water reducing agents, stabilizing agents, defoaming agents, retarders, polyvinyl alcohol, latex powder and the like and uniformly mixing.
The product can meet the requirements of industrial standards, not only reduces the decoration dead weight, but also provides excellent additional performance, greatly improves the additional value of gypsum-based self-leveling, and provides a multifunctional novel material for building interior decoration.
Detailed Description
The described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
A process for preparing the self-levelling light gypsum base includes such steps as alpha-semi-hydrated gypsum, beta-semi-hydrated gypsum and fine aggregate, preparing the self-levelling gypsum base from alpha-semi-hydrated gypsum, beta-semi-hydrated gypsum and fine aggregate, and preparing the self-levelling gypsum base from the fine aggregate with fineness of 40-70 meshes, 70-140 meshes and volume weight of 20-120kg/m3。
In the embodiment, the volume ratio of the fine aggregate fineness of 40-70 meshes to the light aggregate fineness of 70-140 meshes is 1: 2-4.
In this embodiment, specifically, the gypsum-based self-leveling further includes a cementitious material and an additive, and the cementitious material includes: beta hemihydrate gypsum, an alkaline cementing material, a filler and a high-activity cementing material, wherein the additive comprises: water reducing agent, air entraining agent, defoaming agent, retarder, stabilizer, polyvinyl alcohol and redispersible latex powder.
In the embodiment, the weight ratio of the gypsum-based self-leveling powder material is, by 100%, 80-90% of alpha hemihydrate gypsum, 0-10% of beta hemihydrate gypsum, 1-7% of alkaline cementing material, 3-8% of high-activity cementing material, 0-4% of filler, 0.3-0.8% of water reducing agent, 0.01-0.05% of air entraining agent, 0.05-0.2% of defoaming agent, 0.08-0.5% of retarder, 0.06-0.5% of stabilizer, 0.1-0.5% of polyvinyl alcohol and 0.3-1.0% of redispersible latex powder.
In this embodiment, the lightweight aggregate is specifically one or more of expanded perlite, vitrified beads, polyurethane particles, and polystyrene particles.
In this embodiment, specifically, the mass-to-volume ratio of the lightweight gypsum-based self-leveling powder to the lightweight aggregate is, 10 kg: 3-7L.
A preparation and use method of dry-mixed light gypsum-based self-leveling comprises the steps of uniformly mixing all powder materials in the step 2, and uniformly mixing light aggregate according to the proportion in the step 3; wherein the powder material is stirred for 5-8min, and the light aggregate and the powder material are mixed for 1-2 min.
In this embodiment, specifically, the lightweight gypsum base in claim 5 is self-leveling, in the construction process, water is weighed according to the water requirement of standard consistency, all water is placed in a stirrer, the stirrer is opened, the powder is gradually added, stirring is continued for 3-5min after the powder is added, the stirring is performed for 5-10min for defoaming and curing operation of the lightweight gypsum base self-leveling, stirring is performed for 1-2min, the stirring is completed and then the lightweight gypsum base is spread to the construction part, and construction is performed according to the gypsum base self-leveling construction specification.
In the present embodiment, specifically,
the alkaline cementing material is selected from one or more of lime calcium, portland cement and sulphoaluminate cement;
the high-activity cementing material is selected from one or more of silica fume and mineral powder;
the filler is selected from one or more of heavy calcium carbonate and fly ash;
the water reducing agent is selected from one or more of a melamine water reducing agent and a polycarboxylic acid water reducing agent;
the air entraining agent is selected from one or more of natural extraction modified air entraining agent and chemical synthesis air entraining agent;
the defoaming agent is an organic silicon defoaming agent;
the retarder is selected from one or more of inorganic acid, organic acid, protein and amino acid;
the stabilizer is selected from one or more of hydroxypropyl methylcellulose and suspension stabilizer;
the polyvinyl alcohol has an average polymerization degree of 2400 and a alcoholysis degree of 88.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The preparation method of the dry-mixed light gypsum-based self-leveling is characterized by comprising the following steps: comprises alpha semi-hydrated gypsum, beta semi-hydrated gypsum and fine aggregate, wherein the alpha semi-hydrated gypsum, the beta semi-hydrated gypsum and the fine aggregate form a gypsum-based self-leveling, and the gypsum-based self-leveling fine aggregateThe aggregate has fineness of 40-70 meshes and 70-140 meshes, and volume weight of 20-120kg/m3。
2. The dry mix light gypsum based self-leveling preparation of claim 1, wherein: the volume ratio of the fine aggregate fineness of 40-70 meshes to the light aggregate fineness of 70-140 meshes is 1: 2-4.
3. The dry mix light gypsum based self-leveling preparation of claim 1, wherein: the gypsum-based self-leveling mortar further comprises a cementing material and an additive, wherein the cementing material comprises: beta hemihydrate gypsum, an alkaline cementing material, a filler and a high-activity cementing material, wherein the additive comprises: water reducing agent, air entraining agent, defoaming agent, retarder, stabilizer, polyvinyl alcohol and redispersible latex powder.
4. The dry mix light gypsum based self-leveling preparation of claim 1, wherein: the gypsum-based self-leveling powder comprises, by weight, 80-90% of alpha semi-hydrated gypsum, 0-10% of beta semi-hydrated gypsum, 1-7% of alkaline cementing material, 3-8% of high-activity cementing material, 0-4% of filler, 0.3-0.8% of water reducing agent, 0.01-0.05% of air entraining agent, 0.05-0.2% of defoaming agent, 0.08-0.5% of retarder, 0.06-0.5% of stabilizer, 0.1-0.5% of polyvinyl alcohol and 0.3-1.0% of redispersible latex powder, wherein the weight ratio of the gypsum-based self-leveling powder is calculated by 100%.
5. The dry mix light gypsum based self-leveling preparation of claim 1, wherein: the light aggregate is one or more of expanded perlite, vitrified micro bubbles, polyurethane particles and polyphenyl particles.
6. The dry mix light gypsum based self-leveling preparation of claim 1, wherein: the mass-volume ratio of the light gypsum-based self-leveling powder to the light aggregate is 10 kg: 3-7L.
7. A method for preparing and using a dry blended light gypsum based self-leveling product according to any one of claims 1 to 6, wherein the method comprises the following steps: uniformly mixing all the powder materials in the claim 2, and uniformly mixing the lightweight aggregate according to the proportion in the claim 3; wherein the powder material is stirred for 5-8min, and the light aggregate and the powder material are mixed for 1-2 min.
8. The method for preparing and using a dry blended light gypsum based self leveling as claimed in claim 7: the lightweight gypsum base in the claim 5 is self-leveling, water is weighed according to water requirement of standard consistency in the construction process, all water is placed in a stirrer, the stirrer is opened, powder is gradually added, stirring is continued for 3-5min after the powder is added, the stirring is carried out for 5-10min for defoaming and curing operation of the lightweight gypsum base self-leveling, stirring is carried out for 1-2min again, the stirring is completed, the lightweight gypsum base is spread to the construction part, and construction is carried out according to the gypsum base self-leveling construction specification.
9. The method for preparing and using a dry blended light gypsum based self leveling as claimed in claim 7:
the alkaline cementing material is selected from one or more of lime calcium, portland cement and sulphoaluminate cement;
the high-activity cementing material is selected from one or more of silica fume and mineral powder;
the filler is selected from one or more of heavy calcium carbonate and fly ash;
the water reducing agent is selected from one or more of a melamine water reducing agent and a polycarboxylic acid water reducing agent;
the air entraining agent is selected from one or more of natural extraction modified air entraining agent and chemical synthesis air entraining agent;
the defoaming agent is an organic silicon defoaming agent;
the retarder is selected from one or more of inorganic acid, organic acid, protein and amino acid;
the stabilizer is selected from one or more of hydroxypropyl methyl cellulose and suspension stabilizer;
the polyvinyl alcohol has an average polymerization degree of 2400 and an alcoholysis degree of 88.
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Cited By (1)
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| EP4223722A1 (en) * | 2022-02-04 | 2023-08-09 | Sika Technology AG | Fast-drying lightweight screed-mixture |
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