CN115259819A - Gypsum-based composite slurry and application method thereof - Google Patents
Gypsum-based composite slurry and application method thereof Download PDFInfo
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- CN115259819A CN115259819A CN202210729366.7A CN202210729366A CN115259819A CN 115259819 A CN115259819 A CN 115259819A CN 202210729366 A CN202210729366 A CN 202210729366A CN 115259819 A CN115259819 A CN 115259819A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
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- 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
Abstract
The gypsum-based composite slurry comprises the following components 1) composite gypsum powder, which comprises 30-40% by mass of gypsum, 20-30% by mass of heavy calcium and 30-40% by mass of volcanic ash; 2) The polymer slurry comprises 0.2-1% of modifier, 0.5-3.5% of water reducing agent and the balance of purified water by mass ratio; 3) The component 1) accounting for 50 to 80 percent of the mass ratio and the component 2) accounting for 20 to 50 percent of the mass ratio are evenly mixed; wherein the modifier is water-soluble cellulose, including one or two or more of methylcellulose, hydroxypropyl methylcellulose, hydroxyethyl cellulose and lignocellulose; the water reducing agent is one or a mixture of two of sodium gluconate and citric acid; the invention can remove more than 85% of water by three times of circulating operation, only needs 3-4 hours, and is not easy to generate fine dust when the packaged and dried toy parts are unpacked.
Description
Technical Field
The invention relates to the technical field of composite materials, in particular to gypsum-based composite slurry and an application method thereof.
Background
The traditional gypsum packaged toy is manufactured by mixing gypsum mixed calcium carbonate with water to prepare slurry, pouring the slurry into a mold, putting toy parts into the mold, separating the mold after solidification, placing the packaged toy in a net rack, and then solarizing the packaged toy in a square until the packaged toy is dried. The traditional plaster is applied to packaging toys, and has the following defects in the drying process:
1) The sun is exposed to the influence of weather, the sun can be dried only after 10 to 15 days (the time is related to the weather in four seasons and the thickness of the product) when the weather is stable, and a large amount of field and manpower are needed;
2) The high-temperature drying cannot be carried out, and when the temperature exceeds 100 ℃, the continuous long-time baking has the risk of cracking;
3) Drying is insufficient or the product is easy to mildew and disintegrate under the influence of moisture;
4) When the toy is used or played, fine dust is easily generated when the sealing gypsum is dug and unsealed, so that pollution and physical harm are caused;
5) Because of factors of weather and natural environment, the consistency of the dryness can not be ensured, so that the hidden danger of product mildewing exists, the production period is extremely long, the yield and the output value are low, and the delivery period and the quality can not be ensured.
Disclosure of Invention
It is one of the primary objects of the present invention to overcome the above disadvantages and drawbacks of the prior art and to provide a gypsum-based composite slurry.
A gypsum-based composite slurry comprises the following components:
1) The composite gypsum powder comprises 30-60% by mass of gypsum, 20-30% by mass of triple superphosphate and 20-40% by mass of volcanic ash;
2) The polymer slurry comprises 0.1-5% by mass of a modifier, 0-3.5% by mass of a water reducing agent and the balance of purified water;
3) The component 1) accounting for 50 to 80 percent of the mass ratio and the component 2) accounting for 20 to 50 percent of the mass ratio are evenly mixed;
wherein the modifier is water-soluble cellulose, including one or two or more of methylcellulose, hydroxypropyl methylcellulose, hydroxyethyl cellulose and lignocellulose;
the water reducing agent is one or a mixture of two of sodium gluconate, sodium citrate, lignosulfonate water reducing agents, naphthalene high-efficiency water reducing agents, melamine high-efficiency water reducing agents, sulfamate high-efficiency water reducing agents, fatty acid high-efficiency water reducing agents and polycarboxylate high-efficiency water reducing agents.
In one embodiment, the gypsum-based composite slurry comprises the following components:
1) The composite gypsum powder comprises 30-40% by mass of gypsum, 20-30% by mass of triple superphosphate and 30-40% by mass of volcanic ash;
2) The polymer slurry comprises 0.2-1% of modifier, 0.5-3.5% of water reducing agent and the balance of purified water by mass ratio;
3) The component 1) accounting for 50 to 80 percent of the mass ratio and the component 2) accounting for 20 to 50 percent of the mass ratio are evenly mixed;
in one embodiment, the polymer slurry further comprises an antibacterial agent, wherein the antibacterial agent is one or any two of oxyammonium chloride, benzalkonium chloride or a kathon preservative.
Compared with gypsum powder mixed by gypsum and calcium carbonate in the prior art, the gypsum-based composite slurry has the advantages that the volcanic ash is added in addition to the gypsum and the calcium carbonate, so that the weight of the whole packaged toy can be reduced, meanwhile, the evaporation of water vapor is increased in the drying process of the packaged toy, and the drying process time is shortened. Meanwhile, the high polymer slurry is added, so that the dust rate and the cracking rate of the composite gypsum material can be reduced.
In one embodiment, the gypsum-based composite slurry comprises the following components:
1) The composite gypsum powder comprises 35 mass percent of gypsum, 30 mass percent of calcium carbonate and 35 mass percent of volcanic ash;
2) The polymer slurry comprises 1% of modifier, 1% of water reducer, 1% of antibacterial agent and the balance of purified water by mass ratio;
3) The component 1) accounting for 70 percent of the mass ratio and the component 2) accounting for 30 percent of the mass ratio are evenly mixed.
In one embodiment, the gypsum-based composite slurry comprises the following components:
1) The composite gypsum powder comprises 30 mass percent of gypsum, 30 mass percent of calcium carbonate and 40 mass percent of volcanic ash;
2) The polymer slurry comprises 0.8 mass percent of modifier, 1.5 mass percent of water reducer, 0.7 mass percent of antibacterial agent and the balance of purified water;
3) 80 percent of component 1) and 20 percent of component 2) are mixed evenly.
In one embodiment, the polymer paste further comprises a pigment, and the pigment accounts for 0.2-2% of the mass ratio of the polymer paste.
In one embodiment, the composite gypsum powder further comprises other low-specific gravity minerals, wherein the low-specific gravity minerals comprise pumice, pumice powder, vermiculite gravel, vermiculite powder, diatomite, clay and the like, and the low-specific gravity minerals account for 2-30% of the total weight of the total composite gypsum powder.
In one embodiment, the gypsum-based composite slurry comprises the following components:
1) The composite gypsum powder comprises 30 mass percent of gypsum, 30 mass percent of calcium carbonate, 35 mass percent of volcanic ash and 5 mass percent of gravel floe;
2) The polymer slurry comprises 1% of modifier, 1% of water reducer, 1% of antibacterial agent and the balance of purified water by mass ratio;
3) The component 1) accounting for 70 percent of the mass ratio and the component 2) accounting for 30 percent of the mass ratio are evenly mixed.
According to the invention, the low-specific-gravity mineral powder or gravel such as pumice gravel, pumice powder, vermiculite gravel, vermiculite powder, diatomite, clay and the like is added in the basic formula components, so that different touch and friction feelings of the packaged toy can be increased, or the effect of simulating the ground structure can be achieved. Meanwhile, other gravel or powder minerals with low specific gravity can improve the evaporation speed of water.
It is a further object of the present invention to overcome the above disadvantages and drawbacks of the prior art and to provide a method for applying the above gypsum-based composite slurry.
The application method comprises the following steps:
1) Pouring the gypsum-based composite slurry into a mold;
2) Then the toy parts to be packaged are placed in the packaging box, and after 8-30 minutes, the gypsum-based composite slurry and the toy parts are solidified;
3) Then the packaged toy parts are separated from the mould, and the toy parts after demoulding are placed in a net rack and then enter an oven;
4) Baking the toy parts for 25-40 minutes at the temperature of 100-180 ℃;
5) And (3) moving the baked toy parts out of the oven, cooling for 25-40 minutes, then, entering the oven, baking for 2-7 times in a circulating manner, stopping baking until the water content of the packaged gypsum-based composite slurry is not more than 20%, and cooling.
Compared with one-time baking and cooling, the water vapor can not be effectively evaporated or volatilized in a closed oven environment, the invention gradually evaporates the water in the packaged toy through multiple baking and cooling cycles of the oven, and can ensure that the water content of the gypsum-based composite slurry is lower than 20 percent.
In one embodiment, the mold is made of silica gel or plastic or other materials.
The gypsum-based composite slurry has the beneficial effects that:
1) When the temperature exceeds 100 ℃, the surface moisture can be quickly evaporated, but the internal pressure is influenced, so that the evaporation speed of the internal moisture is reduced, the materials packaged in the materials are not suitable for high-temperature long-term baking and are easy to deform, and the problems are avoided by adding the volcanic ash;
2) When the temperature is increased to 130-160 ℃ and the temperature is kept for a short time, the materials packaged in the gypsum are not deformed and damaged, and meanwhile, the moisture and the air in the volcanic ash porous structure in the gypsum are expanded, so that the moisture can be rapidly transferred and diffused to the outside under the pressurization condition;
3) Because the humidity and the temperature of the external environment are relatively low (the temperature difference is more than 100 ℃), the internal convection and the external diffusion effect can be generated very quickly, so that the internal moisture is evaporated (volatilized) quickly, when the internal temperature is gradually close to the room temperature, most of the internal moisture is migrated to the surface, and then the moisture can be removed quickly again through the steps of baking and cooling;
4) More than 85% of water can be removed by three times of circulating operation, only 3-4 hours are consumed, and the method has great advantages in benefit and energy conservation;
5) The automatic industrial production can be practiced, weather interference factors can be eliminated, the traditional manufacturing process is shortened to 3-6 hours from 10-15 days, the productivity and the output value are greatly improved, and the field, labor, time and cost are reduced;
6) When the packaged and dried toy parts are unpacked, fine dust is not easy to generate, and pollution and harm to human bodies are avoided.
Detailed Description
In order that the invention may be more fully understood, reference will now be made to the following description. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Example one
1) Mixing 1.72kg of gypsum, 1.47kg of calcium carbonate and 1.72kg of volcanic ash to prepare composite gypsum powder, wherein the gypsum accounts for 35 percent of the total mass ratio of the composite gypsum powder, the calcium carbonate accounts for 30 percent of the total mass ratio of the composite gypsum powder, and the volcanic ash accounts for 35 percent of the total mass ratio of the composite gypsum powder;
2) 1% of modifier, 1% of water reducing agent and 1% of antibacterial agent by mass, wherein the modifier is 21g of methyl cellulose, the water reducing agent is 21g of sodium gluconate, the antibacterial agent is 21g of benzalkonium chloride, and the balance is purified water; mixing uniformly to obtain polymer slurry;
3) Uniformly mixing 70% of component 1) and 30% of component 2) by mass to obtain the gypsum-based composite slurry.
Example two
1) Mixing 1.47kg of gypsum, 1.47kg of calcium carbonate and 1.96kg of volcanic ash to prepare composite gypsum powder, wherein the gypsum accounts for 30 percent of the total mass of the composite gypsum powder, the calcium carbonate accounts for 30 percent of the total mass of the composite gypsum powder, and the volcanic ash accounts for 40 percent of the total mass of the composite gypsum powder;
2) Modifying agent with the mass ratio of 0.8%, water reducing agent with the mass ratio of 1.5% and antibacterial agent with the mass ratio of 0.7%, wherein the modifying agent is hydroxypropyl methyl cellulose with the mass ratio of 16.8g, the water reducing agent is sodium gluconate with the mass ratio of 31.5g, the antibacterial agent is oxy-ammonium chloride with the mass ratio of 14.7g, and the balance is purified water; mixing uniformly to obtain polymer slurry;
3) Uniformly mixing 80 mass percent of the component 1) and 20 mass percent of the component 2) to obtain the gypsum-based composite slurry.
EXAMPLE III
This example is a comparative example, and materials such as organic polymer materials are not added.
1) 1.96kg of gypsum and 2.94kg of calcium carbonate are mixed to prepare composite gypsum powder, wherein the gypsum accounts for 40% of the total mass of the composite gypsum powder, and the calcium carbonate accounts for 60% of the total mass of the composite gypsum powder;
2) The polymer slurry is not added with organic polymer materials and is purified water;
3) Uniformly mixing 70% of the component 1) by mass and 30% of the component 2) by mass.
Example four
1) 1.72g of gypsum and 3.19kg of calcium carbonate are mixed to prepare composite gypsum powder, wherein the gypsum accounts for 35 percent of the total mass of the composite gypsum powder, and the calcium carbonate accounts for 65 percent of the total mass of the composite gypsum powder;
2) 1% of modifier, 1% of water reducing agent and 1% of antibacterial agent by mass, wherein the modifier is 21g of methyl cellulose, the water reducing agent is 21g of sodium gluconate, the antibacterial agent is 21g of benzalkonium chloride, and the balance is purified water; mixing uniformly to obtain polymer slurry;
3) Uniformly mixing 70% of component 1) and 30% of component 2) by mass to obtain the gypsum-based composite slurry.
Table-formula proportion summary
The invention provides an application method of gypsum-based composite slurry, which comprises the following steps:
1) Pouring the gypsum-based composite slurry obtained in the embodiment into a mold, wherein the mold is made of silica gel, plastic suction or other materials;
2) Then the toy part to be packaged is placed in the packaging box, and after 8-30 minutes, the gypsum-based composite slurry is solidified with the toy part;
3) Then the packaged toy parts are separated from the mould, and the toy parts after demoulding are placed in a net rack and then enter an oven;
4) Baking the toy parts for 25-40 minutes at the temperature of 100-180 ℃;
5) And (3) moving the baked toy parts out of the oven to be cooled for 25-40 minutes, then, entering the oven to be baked, circularly operating for 2-7 times in such a way, stopping baking until the water content of the packaged gypsum-based composite slurry is not more than 20%, and cooling to obtain the finished product.
The gypsum-based composite slurry obtained in the first, second, third and fourth examples is combined with toy parts by the method, and is subjected to baking drying experiments and drying in the sun respectively, the initial weight of the experiment is 700g of the gypsum-based composite slurry, wherein the gypsum-based composite slurry is baked at the temperature of 150 ℃ for 30 minutes/time, the operation is circulated for four times, and the gypsum-based composite slurry is aired in the open air at the temperature of 25-32 ℃/humidity of 50-65% for 15 days, and the data obtained in the two experiments are compared:
second baking test data
Data of the baking experiment of table three
Table four baking experimental data
Table five baking experimental data
Table six drying experimental data
Data of drying experiment
Drying experimental data of table eight
Drying experimental data of table nine
Table ten drying experimental data
Comparison of the results of Table eleven
And (4) conclusion:
1) The dehydration ratio of the gypsum-based composite slurry prepared in the first and second embodiments exceeds 90% in weight average, while the dehydration specific gravity of the gypsum-based composite slurry prepared in the third and fourth embodiments without adding the volcanic ash is lower than 90%, so that the expansion of moisture and air in the porous structure of the volcanic ash can be seen, the moisture can be rapidly migrated and diffused to the outside under the pressurization condition, and the drying speed of the gypsum-based composite slurry is improved;
2) When the baking temperature exceeds 100 ℃, the surface moisture can be quickly evaporated, but the internal pressure can be influenced, so that the evaporation speed of the internal moisture is reduced, the materials packaged in the materials are not suitable for high-temperature long-term baking to cause deformation, and the gypsum-based composite slurry with the added volcanic ash can avoid the situations;
3) Compared with the traditional drying process for 10-15 days, the drying process can remove 85% of water by three times of cyclic operation of baking and drying, and only takes 3-4 hours to reach the drying degree of drying for 10-15 days; and the method can practice automatic industrial production, avoid weather interference factors, greatly improve the productivity and the output value, and reduce the field, labor, time and cost.
The following comparison is made to test whether the gypsum-based composite slurry provided by the invention generates fine dust when used after being dried, thereby causing pollution and physical harm.
After the baking and drying experiments are performed on the packaged toy parts obtained in the first, second, third and fourth embodiments, the packaged toy parts after drying are subjected to the unpacking and crushing experiments. The specific experimental operating method is as follows: use sharp-pointed nail to destroy the experiment in the vertical direction, exert 2 KG's pressure to the encapsulation part, at different positions continuous operation cubic, observe broken perpendicular degree of depth of district and broken district dust volume, specific experimental result is as follows:
TABLE twelve crushing test results
And (4) conclusion: the gypsum-based composite slurry in the first embodiment, the second embodiment and the fourth embodiment contains an organic polymer material, and a crushing area basically has no dust, is moderate in hardness and is easy to unseal; in the fourth embodiment, no organic polymer material is contained, the conventional water and gypsum are mixed, the crushing area has dust, the dust is visible to the touch, the hardness is hard, and the unsealing difficulty is improved compared with that of the first embodiment, the second embodiment and the fourth embodiment.
All possible combinations of the technical features of the embodiments described above may not be described for the sake of brevity, but should be considered as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.
Claims (9)
1. A gypsum-based composite slurry, characterized in that: comprises the following components:
1) The composite gypsum powder comprises 30-60% by mass of gypsum, 20-30% by mass of triple superphosphate and 20-40% by mass of volcanic ash;
2) The polymer slurry comprises 0.1-5% of modifier, 0-3.5% of water reducing agent and the balance of purified water by mass ratio;
3) The component 1) with the mass ratio of 50-80 percent and the component 2) with the mass ratio of 20-50 percent are evenly mixed;
wherein the modifier is water-soluble cellulose, including one or two or more of methylcellulose, hydroxypropyl methylcellulose, hydroxyethyl cellulose and lignocellulose;
the water reducing agent is one or a mixture of two of sodium gluconate, sodium citrate, lignosulfonate water reducing agents, naphthalene high-efficiency water reducing agents, melamine high-efficiency water reducing agents, sulfamate high-efficiency water reducing agents, fatty acid high-efficiency water reducing agents and polycarboxylate high-efficiency water reducing agents.
2. A gypsum-based composite slurry according to claim 1, wherein: comprises the following components:
1) The composite gypsum powder comprises 30-40% by mass of gypsum, 20-30% by mass of triple superphosphate and 30-40% by mass of volcanic ash;
2) The polymer slurry comprises 0.2-1% of modifier, 0.5-3.5% of water reducing agent and the balance of purified water by mass ratio;
3) The component 1) accounting for 50 to 80 percent of the mass ratio and the component 2) accounting for 20 to 50 percent of the mass ratio are evenly mixed.
3. A gypsum-based composite slurry according to claim 2, wherein: comprises the following components:
1) The composite gypsum powder comprises 35% by mass of gypsum, 30% by mass of calcium carbonate and 35% by mass of volcanic ash;
2) The polymer slurry comprises 1% of modifier, 1% of water reducer, 1% of antibacterial agent and the balance of purified water by mass ratio;
3) The component 1) accounting for 70 percent of the mass ratio and the component 2) accounting for 30 percent of the mass ratio are evenly mixed.
4. A gypsum-based composite slurry according to claim 2, wherein: comprises the following components:
1) The composite gypsum powder comprises 30 mass percent of gypsum, 30 mass percent of calcium carbonate and 40 mass percent of volcanic ash;
2) The polymer slurry comprises 0.8 mass percent of modifier, 1.5 mass percent of water reducer, 0.7 mass percent of antibacterial agent and the balance of purified water;
3) 80 percent of component 1) and 20 percent of component 2) are mixed evenly.
5. A gypsum-based composite slurry according to claim 1, wherein: the polymer slurry also comprises an antibacterial agent, wherein one or any two of antibacterial agent oxy ammonium chloride, benzalkonium chloride or a kathon preservative are combined.
6. The gypsum-based composite slurry according to any one of claims 1 to 5, wherein: the polymer slurry also comprises a pigment, wherein the pigment accounts for 0.2-2% of the mass of the polymer slurry.
7. The gypsum-based composite slurry according to any one of claims 1 to 5, wherein: the composite gypsum powder also comprises other low-specific gravity mineral substances, wherein the low-specific gravity mineral substances comprise pumice gravel, pumice powder, vermiculite gravel, vermiculite powder, diatomite, clay and the like, and the low-specific gravity mineral substances account for 2-30% of the total weight of the total composite gypsum powder.
8. An application method of gypsum-based composite slurry comprises the following steps:
1) Pouring the gypsum-based composite slurry into a mold;
2) Then the toy part to be packaged is placed in the packaging box, and after 8-30 minutes, the gypsum-based composite slurry is solidified with the toy part;
3) Then separating the packaged toy parts from the mold, and then placing the toy parts after demolding into a net rack and then entering an oven;
4) Baking the toy parts for 25-40 minutes at the temperature of 100-180 ℃;
5) And (3) moving the baked toy parts out of the oven to be cooled for 25-40 minutes, then, entering the oven to be baked, circularly operating for 2-7 times in such a way, stopping baking until the water content of the packaged gypsum-based composite slurry is not more than 20%, and cooling.
9. The method of applying the gypsum-based composite slurry according to claim 8, wherein: the mould material is silica gel or plastics sucking or other materials.
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| US20060278134A1 (en) * | 2005-06-14 | 2006-12-14 | Lettkeman Dennis M | Modifiers for gypsum slurries and method of using them |
| WO2013048351A1 (en) * | 2011-09-27 | 2013-04-04 | Scg Building Materials Co., Ltd | Gypsum-based composition for construction material and system |
| WO2017199111A1 (en) * | 2016-05-20 | 2017-11-23 | Bawri Binod Kumar | Environment friendly plaster composition produced from pond ash |
| CN112209695A (en) * | 2020-10-13 | 2021-01-12 | 广东博智林机器人有限公司 | Plastering gypsum slurry and dry powder thereof |
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2022
- 2022-06-24 CN CN202210729366.7A patent/CN115259819A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060278134A1 (en) * | 2005-06-14 | 2006-12-14 | Lettkeman Dennis M | Modifiers for gypsum slurries and method of using them |
| WO2013048351A1 (en) * | 2011-09-27 | 2013-04-04 | Scg Building Materials Co., Ltd | Gypsum-based composition for construction material and system |
| WO2017199111A1 (en) * | 2016-05-20 | 2017-11-23 | Bawri Binod Kumar | Environment friendly plaster composition produced from pond ash |
| CN112209695A (en) * | 2020-10-13 | 2021-01-12 | 广东博智林机器人有限公司 | Plastering gypsum slurry and dry powder thereof |
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