CN110759659B - Coagulant and preparation method and application thereof - Google Patents
Coagulant and preparation method and application thereof Download PDFInfo
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- CN110759659B CN110759659B CN201810842431.0A CN201810842431A CN110759659B CN 110759659 B CN110759659 B CN 110759659B CN 201810842431 A CN201810842431 A CN 201810842431A CN 110759659 B CN110759659 B CN 110759659B
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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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- 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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/10—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/10—Accelerators; Activators
- C04B2103/12—Set accelerators
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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
- C04B2111/40—Porous or lightweight materials
Abstract
A coagulant and its preparation method and application are provided. The set accelerator comprises gypsum, a grinding aid and polyphosphate. The coagulant is prepared by mixing and grinding gypsum, grinding aid and polyphosphate. The coagulant is used immediately without preparation, is a high-efficiency and stable gypsum board coagulant, and facilitates the preparation process of the gypsum board.
Description
Technical Field
The present application relates to, but is not limited to, the field of building materials, and in particular, but not limited to, a method for the preparation of an accelerator and its use.
Background
The paper-surface gypsum board is one of the most widely used green building materials in China. The production and consumption of gypsum boards during the 'twelve five' period show an increasing trend, more than 20% of each year is achieved, and the production of gypsum boards in China exceeds 35 hundred million square meters in 2015.
Setting accelerators are required to be added to complete the setting during the gypsum board production process. The coagulant used in the prior art is gypsum powder, the particle size of the gypsum powder is large, generally 0.01-0.02 mm, the specific surface area is small, and the particle size is only 6000-7000 cm2And about/g. Therefore, in the production of gypsum plasterboards, the amount of accelerator added must be increased in order to exert its normal accelerating effect.
The production rate of modern gypsum board factories is as high as 180m/min, and in order to meet the production requirements, more efficient and stable coagulants are required.
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 claims.
Gypsum is currently the most widely used coagulant. However, gypsum as a setting accelerator needs to be prepared and used immediately, otherwise, the setting accelerator effect is affected. In order to solve the above problems, the present application intends to provide an efficient and stable accelerator for gypsum boards.
Provided herein is a set accelerator comprising gypsum, a grinding aid, and polyphosphate.
The polyphosphate is added into the coagulant, so that the change of the coagulant in the air can be effectively avoided, and the due coagulation accelerating effect can be maintained.
In some embodiments, the grade of the gypsum can be greater than 85%; the gypsum can be desulfurized gypsum; the water content of the gypsum may be less than 0.5%.
The water content of the raw materials is controlled, the phenomenon of ball sticking is avoided, and the input-output ratio is improved.
In some embodiments, the grinding aid can be a sugar and/or starch; the sugar can be industrial sugar; the water content of the grinding aid can be lower than 0.5 percent.
Because the hardness of the sugar is higher, the sugar is adopted as the grinding aid, so that the addition amount of the grinding aid can be reduced, and the production cost is reduced.
In some embodiments, the weight ratio of grinding aid to gypsum can be 1-10: 100; the weight ratio of the polyphosphate to the mixture consisting of the grinding aid and the gypsum can be 1-10: 100.
In some embodiments, the average particle size of the coagulant is not greater than 20 μm.
The smaller the particle size of the setting accelerator, the better the setting accelerator effect, and in the present application, the setting accelerator having an average particle size of not more than 20 μm can obtain a good setting accelerator effect.
The present application also provides a method of setting accelerator, comprising the steps of: mixing and grinding gypsum, a grinding aid and polyphosphate to obtain the coagulant.
In some embodiments, the method further comprises: before mixing the gypsum and the grinding aid, drying the phosphogypsum and the grinding aid until the water content is lower than 0.5 percent.
In some embodiments, the grade of the gypsum can be greater than 85%; the gypsum can be desulfurized gypsum.
In some embodiments, the grinding aid can be a sugar and/or starch; the sugar may be an industrial sugar.
In some embodiments, the weight ratio of grinding aid to gypsum can be 1-10: 100; the weight ratio of the polyphosphate to the mixture consisting of the grinding aid and the gypsum can be 1-10: 100.
In some embodiments, the average particle size of the accelerator resulting from milling may be no greater than 20 μm; the grinding time can be 20-40 min; the rotation speed of the grinding can be 300-500 r/min; the temperature of the milling may be below 45 ℃.
At high temperatures, the grinding aid may melt and agglomerate, resulting in deterioration of accelerator performance, and therefore the temperature of grinding can be controlled below 45 ℃.
The application also provides the use of the setting accelerator or the setting accelerator prepared by the method in the preparation of gypsum plasterboards.
In some embodiments, the coagulant may be added in an amount of 0.1 to 2 parts by weight based on 100 parts by weight of the gypsum clinker in the raw material for producing the paper-faced gypsum board.
In some embodiments, the raw materials for preparing the paper-surface gypsum board further comprise water, a binder, a water reducing agent and a foaming agent, wherein the water can be added in an amount of 55-85 parts by weight, the binder can be added in an amount of 0.4-1 part by weight, the water reducing agent can be added in an amount of 0.05-0.5 part by weight, and the foaming agent can be added in an amount of 0.1-1 part by weight, based on 100 parts by weight of the gypsum clinker.
In some embodiments, the binder may be selected from any one or more of native starch, modified corn starch, and modified tapioca starch; the water reducing agent can be selected from any one or more of polycarboxylic acid water reducing agents and naphthalene water reducing agents; the foaming agent may be selected from any one or more of surfactant based foaming agents, for example may be selected from any one or more of sodium lauryl sulfate and fatty acid based foaming agents.
Compared with the prior art, the application has the beneficial effects that:
1. according to the coagulant, sugar or starch grinding aids are added for grinding, so that the obtained coagulant can effectively shorten the initial setting time and final setting time of the gypsum board, and is more efficient;
2. the polyphosphate is added into the coagulant, so that the change of the coagulant in the air can be effectively avoided, the due coagulation accelerating effect is maintained, and the coagulant can be immediately used without preparation;
3. the present application provides a high efficiency, stable gypsum board set accelerator; the application of the coagulant facilitates the preparation process of the paper-surface gypsum board.
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. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the claimed subject matter and are incorporated in and constitute a part of this specification, illustrate embodiments of the subject matter and together with the description serve to explain the principles of the subject matter and not to limit the subject matter.
FIG. 1 is a graph of the moisture-dependent distribution of the particle size of the setting accelerator according to example 1 of the present application;
FIG. 2 is a graph showing the moisture-dependent distribution of the particle size of the setting accelerator of comparative example 1 of the present application.
Detailed Description
To make the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in detail below with reference to the accompanying drawings. 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 raw gypsum used in the following examples and comparative examples is desulfurized gypsum produced in a power plant and has a grade of 86%.
Example 1
(1) Preparation of setting accelerators
Drying the desulfurized gypsum at 45 ℃ for 48 hours to completely dry the desulfurized gypsum;
baking industrial sugar at 45 deg.C for 48 hr to completely dry;
mixing the completely dried industrial sugar and the desulfurized gypsum according to the weight ratio of 5: 100;
mixing polyphosphate and a mixture consisting of desulfurized gypsum and industrial sugar according to a weight ratio of 2: 100;
and (2) putting a mixture consisting of the desulfurized gypsum, the industrial sugar and the polyphosphate into a ball mill for grinding, controlling the temperature of the ball mill to be below 45 ℃, and grinding for 20min at the rotating speed of 400r/min to obtain the coagulant with the average particle size of 16.114 mu m.
(2) Placing a setting accelerator
The prepared coagulant is respectively placed for 0h, 24h and 48h at the temperature of 25 ℃ and the humidity of 90 percent for standby.
(3) Preparation of plasterboard
The prepared coagulant is applied to the production of gypsum plasterboards, and the raw materials comprise: 200g of gypsum clinker, 120g of water, 0.5g of coagulant, 1.4g of binder, 0.4g of water reducing agent and 1g of foaming agent.
Example 2
(1) Preparation of setting accelerators
Drying the desulfurized gypsum at 40 ℃ for 48 hours to completely dry the desulfurized gypsum;
baking industrial sugar at 40 deg.C for 48 hr to completely dry;
mixing the completely dried industrial sugar and the desulfurized gypsum according to the weight ratio of 6: 100;
mixing polyphosphate and a mixture consisting of desulfurized gypsum and industrial sugar according to a weight ratio of 1: 100;
and (2) putting a mixture consisting of the desulfurized gypsum, the industrial sugar and the polyphosphate into a ball mill for grinding, controlling the temperature of the ball mill to be below 45 ℃, and grinding for 20min at the rotating speed of 400r/min to obtain the coagulant with the average particle size of 18.790 mu m.
(2) Placing a setting accelerator
The prepared coagulant is respectively placed for 0h, 24h and 48h at the temperature of 25 ℃ and the humidity of 90 percent for standby.
(3) Preparation of plasterboard
The prepared coagulant is applied to the production of gypsum plasterboards, and the raw materials comprise: 200g of gypsum clinker, 120g of water, 0.5g of coagulant, 1.4g of binder, 0.4g of water reducing agent and 1g of foaming agent.
Example 3
(1) Preparation of setting accelerators
Drying the desulfurized gypsum at 45 ℃ for 48 hours to completely dry the desulfurized gypsum;
baking industrial sugar at 45 deg.C for 48 hr to completely dry;
mixing the completely dried industrial sugar and the desulfurized gypsum according to the weight ratio of 5: 100;
mixing polyphosphate and a mixture consisting of desulfurized gypsum and industrial sugar according to a weight ratio of 8: 100;
the mixture consisting of the desulfurized gypsum, the industrial sugar and the polyphosphate is put into a ball mill for grinding, the temperature of the ball mill is controlled below 45 ℃, the grinding is carried out for 30min, the rotating speed is 400r/min, and the coagulant with the average grain diameter of 15.451 mu m is obtained.
(2) Placing a setting accelerator
The prepared coagulant is respectively placed for 0h, 24h and 48h at the temperature of 25 ℃ and the humidity of 90 percent for standby.
(3) Preparation of plasterboard
The prepared coagulant is applied to the production of gypsum plasterboards, and the raw materials comprise: 200g of gypsum clinker, 120g of water, 0.5g of coagulant, 1.4g of binder, 0.4g of water reducing agent and 1g of foaming agent.
Comparative example 1
(1) Preparation of setting accelerators
Drying the desulfurized gypsum at 45 ℃ for 48 hours to completely dry the desulfurized gypsum;
baking industrial sugar at 45 deg.C for 48 hr to completely dry;
mixing the completely dried industrial sugar and the desulfurized gypsum according to the weight ratio of 5: 100;
grinding the mixture of desulfurized gypsum and industrial sugar in a ball mill, controlling the temperature of the ball mill below 45 ℃, and grinding for 20min to obtain the required coagulant.
(2) Placing a setting accelerator
The prepared coagulant is respectively placed for 0h, 24h and 48h at the temperature of 25 ℃ and the humidity of 90 percent for standby.
(3) Preparation of plasterboard
The prepared coagulant is applied to the production of gypsum plasterboards, and the raw materials comprise: 200g of gypsum clinker, 120g of water, 0.5g of coagulant, 1.4g of binder, 0.4g of water reducing agent and 1g of foaming agent.
Comparative example 2
(1) Preparation of plasterboard
Preparing a paper-surface gypsum board, wherein the raw materials comprise: 200g of gypsum clinker, 120g of water, 1.4g of binder, 0.4g of water reducing agent and 1g of foaming agent.
The initial setting time and final setting time of the prepared gypsum plasterboard slurry were measured according to the method specified in the chinese national standard GB/T17669.4-1999, and the results are shown in table 1.
TABLE 1 initial and Final setting time measurement results
As can be seen from Table 1, the initial setting time and final setting time of the slurries of examples 1 to 3 of the present application to which a set accelerator was added were significantly shorter than those of the slurry of comparative example 2 to which no set accelerator was added. Moreover, the coagulant of the embodiment 1-3 can control the initial setting time of the slurry within 2 minutes and the final setting time within about 6-7 minutes no matter the coagulant is used immediately after being prepared or is used after being placed for 48 hours; among them, the coagulant of example 3 has slightly lower effective components and slightly lower coagulation accelerating effect due to slightly larger addition amount of polyphosphate compared with the addition amount of examples 1-2, but still has better coagulation accelerating effect than that of comparative example 1 after being placed for a certain time, and still embodies the advantages of high efficiency and stability of the coagulant of the present application. The setting accelerator of comparative example 1, on the other hand, was used only at a setting time of 0, and resulted in a slurry having an initial setting time and a final setting time similar to those of the setting accelerators of examples 1-3 of the present application after 48 hours of standing, but still longer than those of the setting accelerators of examples 1-2 of the present application at a setting time of 0, and the setting accelerating effect decreased with the increase in the standing time.
Therefore, the coagulant prepared by the method can effectively keep the self-coagulation accelerating effect under the condition of high humidity, and can be immediately used without preparation, so that the preparation process of the paper-surface gypsum board is greatly facilitated.
By observing the micro-morphology of the existing gypsum coagulant, some tiny particles can be dissolved by water in the air, and the edges and corners of some coagulant particles can be slowly rounded in the air, thereby reducing the coagulation accelerating effect. The polyphosphate added in the application can effectively avoid the change of the coagulant in the air, thereby maintaining the due coagulation accelerating effect.
FIG. 1 shows the particle size distribution curve of the setting accelerator of example 1 of the present application in the dry state and after standing for 48 hours at a temperature of 25 ℃ and a humidity of 90%; as can be seen from FIG. 1, the coagulant obtained in example 1 of the present application effectively avoids the change of the coagulant in air due to the addition of polyphosphate, so that the particle size distribution is less affected by humidity, the proper set accelerating effect can be maintained, and the coagulant is a high-efficiency and stable gypsum board coagulant.
FIG. 2 shows the particle size distribution curve of the setting accelerator of comparative example 1 of the present application in the dry state and after standing for 48h at a temperature of 25 ℃ and a humidity of 90%. As can be seen from FIG. 2, the setting accelerator obtained in comparative example 1, to which no polyphosphate was added, had a particle size distribution greatly affected by humidity, and the setting accelerating effect and stability thereof were reduced.
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 (13)
1. The coagulant consists of gypsum, a grinding aid and polyphosphate, wherein the weight ratio of the polyphosphate to a mixture consisting of the grinding aid and the gypsum is 1-10: 100, and the grinding aid is sugar and/or starch.
2. The setting accelerator according to claim 1, wherein the grade of the raw gypsum is greater than 85%;
optionally, the gypsum is desulfurized gypsum;
optionally, the water content of the gypsum is less than 0.5%.
3. The setting accelerator according to claim 1,
the sugar is industrial sugar;
optionally, the water content of the grinding aid is less than 0.5%.
4. The setting accelerator according to claim 1 or 2, wherein the weight ratio of grinding aid to gypsum is from 1 to 10: 100.
5. The setting accelerator according to claim 1 or 2, wherein the setting accelerator has an average particle size of not more than 20 μm.
6. A process for preparing an accelerator according to any one of claims 1 to 5, which comprises the steps of: mixing and grinding gypsum, a grinding aid and polyphosphate to obtain the coagulant.
7. The method of claim 6, further comprising: drying the raw gypsum and the grinding aid until the water content is lower than 0.5 percent before mixing the raw gypsum and the grinding aid.
8. The process according to claim 6 or 7, wherein the average particle size of the coagulant obtained by grinding is not greater than 20 μm;
optionally, the grinding time is 20-40 min;
optionally, the rotation speed of grinding is 300-500 r/min;
optionally, the temperature of the milling is below 45 ℃.
9. Use of the setting accelerator according to any of claims 1 to 5 or the setting accelerator prepared according to the process of any of claims 6 to 8 for the preparation of paper-faced gypsum board.
10. The use according to claim 9, wherein the coagulant is added in an amount of 0.1 to 2 parts by weight based on 100 parts by weight of the added gypsum clinker in the raw material for producing the paper-faced gypsum board.
11. The use of claim 10, wherein the raw materials for preparing the paper-surface gypsum board further comprise water, a binder, a water reducing agent and a foaming agent, based on 100 parts by weight of the added gypsum clinker, the added amount of the water is 55-85 parts by weight, the added amount of the binder is 0.4-1 part by weight, the added amount of the water reducing agent is 0.05-0.5 part by weight, and the added amount of the foaming agent is 0.1-1 part by weight.
12. The use according to claim 11, wherein,
the binder is selected from any one or more of native starch, modified corn starch and modified tapioca starch;
optionally, the water reducing agent is selected from any one or more of polycarboxylic acid water reducing agents and naphthalene water reducing agents;
optionally, the foaming agent is selected from any one or more of surfactant based foaming agents.
13. Use according to claim 11, wherein the foaming agent is optionally selected from any one or more of sodium lauryl sulfate and fatty acid based foaming agents.
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| CN201810842431.0A CN110759659B (en) | 2018-07-27 | 2018-07-27 | Coagulant and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| ID21641A (en) * | 1997-08-21 | 1999-07-08 | United States Gypsum Co | PRODUCTS CONTAINING GYPSUM BY IMPROVING RESISTANCE TO FIXED DEFORMATION AND METHODS AND COMPOSITION TO PRODUCE IT |
| US6409823B1 (en) * | 1999-12-28 | 2002-06-25 | United States Gypsum Company | Hydration enhancing additives |
| US6409825B1 (en) * | 2000-11-22 | 2002-06-25 | United States Gypsum Company | Wet gypsum accelerator and methods, composition, and product relating thereto |
| US6822033B2 (en) * | 2001-11-19 | 2004-11-23 | United States Gypsum Company | Compositions and methods for treating set gypsum |
| US20060243171A1 (en) * | 2005-04-27 | 2006-11-02 | United States Gypsum Company | Wet gypsum accelerator and methods, composition, and product relating thereto |
| CN104556809A (en) * | 2014-12-04 | 2015-04-29 | 肇庆北新建材有限公司 | Method for preparing gypsum board coagulation accelerator |
| CN105152617B (en) * | 2015-09-06 | 2018-02-16 | 山东拜尔建材有限公司 | A kind of Thistle board and preparation method using negative ion powder production |
| CN106082746A (en) * | 2016-06-08 | 2016-11-09 | 泰安市跨海贸易有限公司 | A kind of additive improving gypsum crystal anti-corrosion performance |
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