CN114685135A - Light gypsum mortar with high coating rate - Google Patents
Light gypsum mortar with high coating rate Download PDFInfo
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- CN114685135A CN114685135A CN202210507484.3A CN202210507484A CN114685135A CN 114685135 A CN114685135 A CN 114685135A CN 202210507484 A CN202210507484 A CN 202210507484A CN 114685135 A CN114685135 A CN 114685135A
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- gypsum mortar
- gypsum
- mortar
- lightweight
- coating rate
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- 239000011426 gypsum mortar Substances 0.000 title claims abstract description 72
- 239000011248 coating agent Substances 0.000 title claims abstract description 27
- 238000000576 coating method Methods 0.000 title claims abstract description 27
- 239000011490 mineral wool Substances 0.000 claims abstract description 22
- 239000010425 asbestos Substances 0.000 claims abstract description 17
- 229910052895 riebeckite Inorganic materials 0.000 claims abstract description 17
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 14
- 239000004576 sand Substances 0.000 claims description 12
- 239000010440 gypsum Substances 0.000 claims description 11
- 229910052602 gypsum Inorganic materials 0.000 claims description 11
- 239000004816 latex Substances 0.000 claims description 6
- 229920000126 latex Polymers 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 239000011325 microbead Substances 0.000 claims description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- 229920001479 Hydroxyethyl methyl cellulose Polymers 0.000 claims description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 239000011575 calcium Substances 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 3
- 238000007667 floating Methods 0.000 claims description 3
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 3
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 3
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 3
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 3
- 239000010451 perlite Substances 0.000 claims description 3
- 235000019362 perlite Nutrition 0.000 claims description 3
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 3
- 229920002126 Acrylic acid copolymer Polymers 0.000 claims description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 2
- 239000002639 bone cement Substances 0.000 claims description 2
- 239000006227 byproduct Substances 0.000 claims description 2
- 238000006477 desulfuration reaction Methods 0.000 claims description 2
- 230000023556 desulfurization Effects 0.000 claims description 2
- 239000003546 flue gas Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 102000004169 proteins and genes Human genes 0.000 claims description 2
- 108090000623 proteins and genes Proteins 0.000 claims description 2
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 claims 2
- 238000007665 sagging Methods 0.000 abstract description 8
- 239000004566 building material Substances 0.000 abstract description 3
- 239000002131 composite material Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 14
- 239000000463 material Substances 0.000 description 11
- 239000000047 product Substances 0.000 description 9
- 238000002156 mixing Methods 0.000 description 6
- 229910000838 Al alloy Inorganic materials 0.000 description 5
- 238000010276 construction Methods 0.000 description 5
- 239000002002 slurry Substances 0.000 description 4
- 238000010348 incorporation Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 229920000742 Cotton Polymers 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 229920006243 acrylic copolymer Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000013538 functional additive Substances 0.000 description 1
- 239000012784 inorganic fiber Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 239000013008 thixotropic agent Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/40—Asbestos
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/46—Rock wool ; Ceramic or silicate fibres
-
- 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
- C04B2111/00482—Coating or impregnation materials
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the technical field of building materials, and particularly discloses light gypsum mortar with high coating rate. The light gypsum mortar provided by the invention has the excellent performance characteristics of high coating rate and high strength by adding mineral wool or asbestos on the basis of the components of the existing gypsum mortar. The composite addition of mineral wool or asbestos and lightweight aggregate ensures that the product strength meets the national standard while greatly improving the coating rate, and solves the technical problem that the product strength is greatly reduced under the condition that the coating rate of the lightweight gypsum mortar is obviously increased. In addition, the mineral wool or the asbestos is also used as an anti-sagging agent, so that the anti-sagging performance of the light gypsum mortar is greatly improved, and the excellent performance characteristics of the mineral wool or the asbestos provide wider application prospects for the light gypsum mortar.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to light gypsum mortar with high coating rate.
Background
The lightweight gypsum mortar is a novel environment-friendly plastering material, takes semi-hydrated gypsum as a main cementing material, is prepared by adding lightweight aggregate and functional additives, has the advantages of good working performance, small shrinkage, difficult cracking and hollowing, good cohesiveness, environmental protection and the like compared with the traditional cement plastering material, and has the effect of adjusting indoor humidity. With the rapid development of the building material industry, lightweight gypsum mortar is developing toward higher quality products. The coating rate of the lightweight gypsum mortar is an important performance index with higher market attention, and the coating rate of the gypsum mortar is generally increased by adding lightweight aggregate. However, the incorporation of excessive or poorly graded lightweight aggregates leads to a decrease in the strength of the gypsum mortar and a serious influence on the workability of the product. Therefore, how to balance and match the relationship between the coating rate and the strength of the light gypsum mortar is a technical point of the light gypsum mortar in the prior stage for intensive research.
In addition, the light gypsum mortar has the problems of sagging, slipping and the like in the construction process, so that the product has poor construction performance and low construction efficiency. The prior method for improving the sag resistance of the lightweight gypsum mortar is generally to add a thixotropic agent or a thickening agent, but the additive can increase the slurry consistency, so that the problems of difficult scraping of the product, labor-consuming construction and the like are caused. In addition, the water consumption of products is not accurately controlled on a construction site, and the water adding amount completely depends on the visual feeling of constructors; when the amount of water used is excessive, the problem of sagging of the gypsum mortar is more likely to occur. Therefore, how to improve the sag resistance of the gypsum mortar is also an important research topic of the lightweight gypsum mortar.
Disclosure of Invention
The inventor of the invention provides a brand-new method for improving the coating rate of the light gypsum mortar based on long-term research on the performance of the light gypsum mortar, and simultaneously has the characteristic of high strength; in addition, the light gypsum mortar also has excellent anti-sagging performance, and provides wider application prospects for the light gypsum mortar.
The invention adopts the following technical scheme:
the light gypsum mortar with high coating rate comprises the following components in parts by mass, which are uniformly mixed:
in individual embodiments, no more than 200 parts of fine sand is also included.
In a particular embodiment, no more than 3 parts of dispersible latex powder is included.
According to the light gypsum mortar provided by the invention, the mineral wool or the asbestos is added, and the content of the mineral wool or the asbestos is preferably controlled to be 0.1-3% of the total weight of the light gypsum mortar, so that the light gypsum mortar has the performance characteristics of high coating rate and high strength, and has better sag resistance, and the improvement of the performance of the light gypsum mortar in the two aspects provides great advantages for the practical application of the light gypsum mortar.
The mineral wool is inorganic fiber cotton prepared by using rock such as slag, fly ash or basalt as main raw materials and melting the rock into cotton at high temperature, and the bulk density of the mineral wool is 50kg/m3～250kg/m3。
The asbestos, a natural silicate material with industrial application, contains iron, magnesium, calcium or sodium, exists in a crystalline form, is in a fibrous form, and has a bulk density of 50kg/m3～250kg/m3。
The semi-hydrated gypsum can be prepared by calcining a byproduct in a flue gas desulfurization process of a thermal power plant, wherein the purity of the desulfurized gypsum is not lower than 85%.
The particle size of the closed-cell vitrified micro-bead or the open-cell perlite is 0.3 mm-1.0 mm, and the bulk density is more than 80kg/m3The cylinder pressure strength is not lower than 200kPa, the heat conductivity coefficient is not higher than 0.070W/(m.K), the volume water absorption rate is not higher than 45%, and the volume floating rate is not lower than 80%.
The retarder adopts bone glue protein retarder and/or sugar calcium gypsum retarder material.
The water retention agent adopts hydroxyethyl methyl cellulose or hydroxypropyl methyl cellulose, and the viscosity of the water retention agent is 30000mPa & s-100000 mPa & s.
The fine sand is selected from any one of natural river sand, lake sand, sea sand and machine-made sand, and the preferred mesh number is 50-120 meshes.
The dispersible latex powder adopts at least one of ethylene-vinyl acetate copolymer, acrylic acid copolymer and polyvinyl alcohol.
On the basis of the components of the existing gypsum mortar, the light gypsum mortar obtained by adding mineral wool or asbestos has the excellent performance characteristics of high coating rate and high strength. The composite addition of mineral wool or asbestos and lightweight aggregate ensures that the product strength meets the national standard while greatly improving the coating rate, and solves the technical problem that the product strength is greatly reduced under the condition that the coating rate of the lightweight gypsum mortar is obviously increased. In addition, the mineral wool or the asbestos is also used as an anti-sagging agent, so that the anti-sagging performance of the light gypsum mortar is greatly improved, and the excellent performance characteristics of the mineral wool or the asbestos provide wider application prospects for the light gypsum mortar.
Detailed Description
The following describes embodiments of the present invention in detail. As the present invention may be embodied in many different forms, the invention should not be construed as limited to the specific embodiments set forth herein. Rather, these embodiments are provided to explain the principles of the invention and its practical application so as to enable others skilled in the art to understand the invention for various embodiments and its practical application.
It should be noted that, since the performance of each light gypsum mortar is measured with respect to a system obtained after mixing with water, and the amount of water used for mixing affects the performance of the system after mixing, in order to distinguish between before and after mixing with water, in each of the following examples, the term "light gypsum mortar dry-mixed material" refers to the light gypsum mortar protected by the present invention, and the term "gypsum mortar" refers to the product obtained after mixing the light gypsum mortar protected by the present invention with water.
The following table 1 shows the components and contents of the light gypsum mortar dry-mixed materials provided in examples 1 to 8 of the present invention.
Table 1 components and amounts of dry-mix for lightweight gypsum mortar provided in examples 1-8
Unit: kg of
In the above examples, the retarders in examples 1 to 3, 5, 6 and 8 are all ossein retarders, and the dispersible latex powder is all ethylene-vinyl acetate copolymer; in the other examples, the retarder is a calcium-sugar gypsum retarder material, and the dispersible latex powder is a mixture of acrylic copolymer and polyvinyl alcohol. The water-retaining agents in examples 1 to 6 were each hydroxyethyl methylcellulose having a viscosity of about 50000 mPas, and the water-retaining agents in the remaining examples were each hydroxypropyl methylcellulose having a viscosity of about 80000 mPas.
Meanwhile, the closed cell vitrified microbeads of examples 1 to 3, 5, 6 and 8 and the open cell perlite of examples 4 and 7 were selected to meet the following characteristics: the grain diameter is 0.3 mm-1.0 mm, and the bulk density is more than 80kg/m3The cylinder pressure strength is not lower than 200kPa, the heat conductivity coefficient is not higher than 0.070W/(m.K), the volume water absorption is not higher than 45 percent, and the volume floating rate is not lower than 80 percent.
The above components and the addition of the fine sand are all conventional in the art, and are not described herein, and those skilled in the art can refer to the prior art.
In order to show the influence of the mineral wool or asbestos in the dry-mixed material of the lightweight gypsum mortar provided in each example on the coating rate, strength and sag resistance of the gypsum mortar, the following comparative experiment was performed.
The components and contents of the comparative lightweight gypsum mortar dry mixes provided in comparative examples 1 to 4 are shown in table 2 below.
Table 2 components and content units of comparative light gypsum mortar dry-mixes provided in comparative examples 1 to 4: kg of
The following performance tests were carried out on each of the obtained gypsum mortars:
and (3) detecting the coating rate: taking 10kg of light gypsum mortar dry-mixed material or contrast light gypsum mortar dry-mixed material, adding water consumption with standard diffusivity, stirring for 1min to obtain uniformly stirred gypsum mortar, and uniformly coating the gypsum mortar in a pre-manufactured test mold frame, wherein the thickness of the gypsum mortar coated on the test mold frame is 10mm, and the coating area is 1m x 2 m. The actual application area of 10kg of dry mix of gypsum mortar was tested. Wherein, the water consumption data of the standard diffusivity refers to a method for measuring the water consumption of the standard diffusivity in GB/T28627-2012 plastering gypsum, namely the water consumption when the standard diffusivity range is 160-170 mm.
The glide distance of the mortar with the thickness of 10 mm: and (3) scraping gypsum mortar with the thickness of 10mm on the smooth and flat aluminum alloy plate, marking the lower bottom surface, then vertically placing the aluminum alloy plate, and observing the downward sliding distance of the lower bottom surface after the gypsum mortar is solidified and hardened. The aluminum alloy plate belongs to a smooth and flat surface, and the frictional resistance of the surface of the assembled building wall which is even very flat is far higher than that of the aluminum alloy plate on the site generally, so that the gliding distance is observed on the smooth and flat aluminum alloy plate, and the sagging resistance of the product is more intuitive and enlarged.
TABLE 3 Properties of Gypsum mortars corresponding to examples 1 to 8 and comparative gypsum mortars corresponding to comparative examples 1 to 4
In examples 1 to 3, the gypsum mortar obtained by adding different amounts of mineral wool, and in examples 4 to 6, the gypsum mortar obtained by adding different amounts of mineral wool was remarkably improved in sag resistance, and the surface of the mortar was smooth and fine without granular feeling. With the increase of the mixing amount of the mineral wool or the asbestos, the coating rate of the gypsum mortar is gradually increased, but the flexural strength/compressive strength is not obviously influenced, and is slightly reduced, such as example 1 and example 3, and under the condition that the coating rate is increased by 19.0%, the compressive strength is only reduced by 7.3%; as in examples 4 and 6, the compressive strength decreased by only 5.5% when the coating rate was increased by 20.3%.
Comparative example 1 in comparison with examples 1 to 8, the mineral wool or asbestos was not added, the coating rate was the lowest, the sag resistance was poor, and the surface had a coarse granular feel.
Comparative example 2 in comparison with example 2, the same application area of 1.75m was achieved210kg, mineral wool is not mixed in the comparative example 2, 45kg of closed-cell vitrified micro-beads are additionally added, the flexural strength and the compressive strength of the comparative example 2 are obviously reduced, and the strength requirement of a light bottom layer in GB/T28627-2012 plastering gypsum can not be met. It can be seen that when mineral wool is not used in the comparative gypsum mortar, even if the coating rate is increased by adding a large amount of closed-cell vitrified micro bubbles, the flexural/compressive strength is still significantly affected, and both cannot be considered. Also, the incorporation of too much lightweight aggregate leads to a decrease in slurry viscosity and poor sag resistance.
In comparative example 3 and comparative example 4, too much mineral wool or asbestos is added, the coating rate is obviously improved, but the flexural strength and the compressive strength are obviously reduced, and the strength requirement of a light bottom layer in GB/T28627-2012 plastering gypsum is not met. Also, the incorporation of too much mineral wool or asbestos results in excessive water usage, increased slurry porosity, reduced viscosity, and poor slip resistance of the slurry.
While the invention has been shown and described with reference to certain embodiments, those skilled in the art will understand that: various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (10)
1. The light gypsum mortar with high coating rate is characterized by comprising the following components in parts by mass which are uniformly mixed:
2. the lightweight gypsum mortar of claim 1, further comprising no more than 200 parts of fine sand.
3. The lightweight gypsum mortar of claim 1, further comprising not more than 3 parts of a dispersible latex powder.
4. The lightweight gypsum mortar of any one of claims 1 to 3, wherein the mineral wool and the asbestos each have a bulk density of 50kg/m3～250kg/m3。
5. The light gypsum mortar of claim 4, wherein the hemihydrate gypsum is gypsum calcined as a byproduct in a flue gas desulfurization process of a thermal power plant, and the purity of the desulfurized gypsum in the hemihydrate gypsum is not less than 85%.
6. The lightweight gypsum mortar of claim 4, wherein the closed cell vitrified microbeads and the open cell perlite have a particle size of 0.3mm to 1.0mm and a bulk density of more than 80kg/m3The cylinder pressure strength is not lower than 200kPa, the heat conductivity coefficient is not higher than 0.070W/(m.K), the volume water absorption is not higher than 45 percent, and the volume floating rate is not lower than 80 percent.
7. The lightweight gypsum mortar of claim 4, wherein the set retarder is selected from the group consisting of bone glue protein set retarders and/or calcium sugar gypsum set retarders.
8. The light gypsum mortar of claim 4, wherein the water retaining agent is selected from hydroxyethyl methylcellulose and/or hydroxypropyl methylcellulose, and the viscosity of the water retaining agent is 30000mPa s to 100000mPa s.
9. The lightweight gypsum mortar of claim 2, wherein the fine sand is selected from any one of natural river sand, lake sand, sea sand and machine-made sand, and the mesh number of the fine sand is 50 to 120 mesh.
10. The lightweight gypsum mortar of claim 3, wherein the dispersible latex powder is selected from at least one of ethylene-vinyl acetate copolymer, acrylic acid copolymer, polyvinyl alcohol.
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| CN108275959A (en) * | 2018-03-12 | 2018-07-13 | 太原理工大学 | A kind of cracking resistance plastering gupsum of high tenacity enhanced water resistance |
| CN111268983A (en) * | 2019-12-02 | 2020-06-12 | 江苏吉邦材料科技有限公司 | Application of closed-cell vitrified micro bubbles and light gypsum mortar using same and easy to detect bubble hollowing |
| CN112723907A (en) * | 2021-02-01 | 2021-04-30 | 贵州中亚高科涂料有限公司 | Formula and production method of high-tensile-strength plastering gypsum |
| CN114349453A (en) * | 2021-12-31 | 2022-04-15 | 江苏吉邦材料科技有限公司 | High-coating-rate light gypsum mortar |
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2022
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Application publication date: 20220701 |