CN111606648B - Gypsum-based heat-conducting self-leveling mortar and preparation method and application thereof - Google Patents
Gypsum-based heat-conducting self-leveling mortar and preparation method and application thereof Download PDFInfo
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- CN111606648B CN111606648B CN201910354142.0A CN201910354142A CN111606648B CN 111606648 B CN111606648 B CN 111606648B CN 201910354142 A CN201910354142 A CN 201910354142A CN 111606648 B CN111606648 B CN 111606648B
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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
- C04B28/142—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 containing synthetic or waste calcium sulfate cements
- C04B28/143—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 containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being phosphogypsum
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/60—Flooring materials
- C04B2111/62—Self-levelling compositions
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/10—Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
A gypsum-based heat-conducting self-leveling mortar and a preparation method and application thereof. The preparation raw materials of the gypsum-based heat-conducting self-leveling mortar comprise ardealite, papermaking white mud and a heat-conducting material, and cement is not included. The preparation method comprises the following steps: mixing the phosphogypsum and the papermaking white mud, calcining and ball-milling; and mixing the ball-milled phosphogypsum and papermaking white mud with heat conduction materials, aggregates, retarders, defoaming agents, water-retaining agents, water reducing agents and redispersible latex powder. The gypsum-based heat-conducting self-leveling mortar has good fluidity and heat conductivity, can be used for gap filling and upper covering of a floor heating pipeline, greatly saves the raw material cost of a floor heating system, and realizes resource recycling of two solid wastes, namely phosphogypsum and papermaking white mud.
Description
Technical Field
The invention relates to the field of inorganic building materials, in particular to gypsum-based heat-conducting self-leveling mortar and a preparation method and application thereof.
Background
Phosphogypsum is an industrial byproduct generated in the production of phosphoric acid, and the generation amount of the phosphogypsum is rapidly increased in recent years, but the utilization rate is low, so that the stockpiling amount is huge. The accumulation of the phosphogypsum not only occupies a large amount of land resources, but also causes certain harm to the surrounding environment. Meanwhile, natural gypsum and desulfurized gypsum resources are in daily use. If the phosphogypsum can be used for replacing natural gypsum and desulfurized gypsum, the problems caused by phosphogypsum stockpiling can be solved, and sufficient raw materials can be provided for future gypsum building materials. Therefore, the comprehensive utilization of the phosphogypsum is urgently realized.
The ground radiation heating (floor heating) system has the advantages of good thermal stability, energy conservation, high efficiency, high safety performance, no indoor area occupation and the like, gradually replaces the traditional wall-mounted heating mode in recent years, is gradually popularized and applied in residential buildings, and has a wide market. The ground heating pipeline gap filling and the upper layer covering need floor mortar materials, and the self-leveling mortar materials can automatically level by means of the flowing characteristics of fluid, are quickly dried, and save materials and labor.
If gypsum-based self-leveling mortar which can be used for filling gaps of floor heating pipelines and covering upper layers can be produced by using the solid waste phosphogypsum with rich resources, the raw material cost of a floor heating system can be greatly saved, the solid waste phosphogypsum is consumed, and the economic and social effects are obvious. However, no report on the production of gypsum-based self-leveling mortars using phosphogypsum has been found at present.
Disclosure of Invention
The inventor of the application finds that the strong acidity of the phosphogypsum can bring adverse effects to products produced by the phosphogypsum, thereby limiting the comprehensive utilization of the phosphogypsum.
The inventors of the present application have also found that in paper making enterprises, the amount of lime mud discharged during the paper making process per year is very surprising. The papermaking white mud is from an alkali recovery working section, mainly contains calcium carbonate, and also contains lime, calcium silicate, residual sodium hydroxide and the like which are excessively added in the causticizing process, and is strong in alkalinity.
The gypsum-based heat-conducting self-leveling mortar has good fluidity and heat conductivity, can be used for filling gaps of floor heating pipelines and covering the upper layer, greatly saves the raw material cost of a floor heating system, and realizes the resource recycling of two solid wastes, namely phosphogypsum and papermaking white mud.
The application provides gypsum-based heat-conducting self-leveling mortar, and the preparation raw materials of the gypsum-based heat-conducting self-leveling mortar comprise ardealite, papermaking white mud and a heat-conducting material, and do not comprise cement.
In the examples of the present application, the papermaking white mud may be added in an amount of 8 to 15 parts by weight, based on 100 parts by weight of the added amount of the phosphogypsum.
In the examples of the present application, the thermally conductive material may be added in an amount of 5 to 10 parts by weight, based on 100 parts by weight of the added amount of the phosphogypsum.
In embodiments of the present application, the thermally conductive material may be selected from any one or more of aluminum oxide, zinc oxide, silicon carbide, carbon nanotubes, aluminum nitride, and boron nitride.
In the embodiment of the application, the preparation raw materials of the gypsum-based heat-conducting self-leveling mortar may further include aggregate, a retarder, a defoaming agent, a water-retaining agent, a water-reducing agent and redispersible latex powder, and the addition amount of the aggregate is 40 to 48 parts by weight, the addition amount of the retarder is 0.06 to 0.1 part by weight, the defoaming agent is 0.06 to 0.12 part by weight, the addition amount of the water-retaining agent is 0.06 to 0.12 part by weight, the addition amount of the water-reducing agent is 0.03 to 0.08 part by weight, and the addition amount of the redispersible latex powder is 0.2 to 0.7 part by weight, based on 100 parts by weight of the addition amount of the phosphogypsum.
In embodiments of the present application, the aggregate may be selected from aggregates commonly used in the art, for example, blast furnace slag powder and the like.
In embodiments of the present application, the retarder may be selected from retarders commonly used in the art, for example, sodium citrate, citric acid, sodium tartrate, and the like.
In the embodiments herein, the antifoaming agent may be selected from antifoaming agents commonly used in the art, for example, polydimethylsiloxane and the like.
In the examples herein, the water retaining agent may be selected from water retaining agents commonly used in the art, for example, hydroxypropyl methyl cellulose ether and the like.
In embodiments herein, the water reducer may be selected from water reducers commonly used in the art, for example, polycarboxylic acid water reducers and the like.
The application also provides a preparation method of the gypsum-based heat-conducting self-leveling mortar, which comprises the following steps:
mixing the phosphogypsum and the papermaking white mud, calcining and ball-milling; and
mixing the ball-milled phosphogypsum and papermaking white mud with heat conduction materials, aggregates, retarders, defoaming agents, water-retaining agents, water reducing agents and redispersible latex powder.
In the embodiment of the present application, the temperature of the calcination may be 130-150 ℃ and the time may be 0.5-1 hour.
In the embodiment of the application, the Boehringer specific surface area of the ball-milled phosphogypsum and the papermaking white mud can be 4000-5500cm2/g。
The application also provides the application of the gypsum-based heat-conducting self-leveling mortar in the gap filling and upper covering of the floor heating pipeline.
The preparation method adopts the composite material of the phosphogypsum and the papermaking white mud as the cementing material for preparing the self-leveling mortar, the papermaking white mud has strong basicity, and can neutralize the phosphogypsum solid waste with strong acidity to obtain the composite cementing material with the pH value close to neutrality, so that the problem that the phosphogypsum cannot be applied due to too strong acidity is solved; moreover, the phosphogypsum has high hardness and wear resistance, and can improve the compressive strength of the self-leveling mortar, and the main components in the papermaking white mud are calcium carbonate and residual plant fibers, so that the flexural strength of the self-leveling mortar can be improved, and the strength of the self-leveling mortar is improved; in addition, the self-leveling mortar has good fluidity, and can realize zero addition of cement; furthermore, the addition of the heat conduction material improves the heat conduction coefficient of the self-leveling mortar, so that the self-leveling mortar can be used for filling gaps of floor heating pipelines and covering surfaces of upper layers. Therefore, the method not only greatly saves the raw material cost of the floor heating system, but also realizes the resource recycling of the phosphogypsum and the papermaking white mud.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. Other advantages of the application may be realized and attained by the instrumentalities and methods described in the specification and claims.
Detailed Description
Hereinafter, embodiments of the present application will be described in detail to make objects, technical solutions and advantages of the present application more apparent. 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 phosphogypsum adopted in the following examples is from a phosphorus industry company of Wuhan, papermaking white mud is from a paper industry company of Hunan, blast furnace slag powder is from a steel plant of Hunan, and other raw materials are common commercial products.
Example 1
Mixing 1000g phosphogypsum (pH value 3.2) with 150g papermaking white mud (pH value 12.7), calcining at 130 deg.C for 1 hr, and ball milling in ball mill for 1 hr to obtain phosphogypsum with pH value of about 6.8 and specific surface area of 5500cm2And adding 100g of alumina powder with the particle size of 50-100nm, 200g of blast furnace slag powder with 40 meshes and 80 meshes, 0.6g of sodium citrate, 0.6g of polydimethylsiloxane, 0.6g of hydroxypropyl methyl cellulose ether, 0.3g of polycarboxylic acid water reducing agent and 5g of redispersible emulsion powder into the composite powder material per gram, and fully mixing to obtain the gypsum mortar powder.
Example 2
Mixing 1000g phosphogypsum (pH value 3.2) with 120g papermaking white mud (pH value 12.7), calcining at 150 deg.C for 0.5 hr, and ball milling in ball mill for 1 hr to obtain phosphogypsum with pH value of about 6.4 and specific surface area of 5000cm2And adding 80g of silicon carbide powder with the particle size of 50-100nm, 220g of blast furnace slag powder with 40 meshes and 80 meshes, 0.6g of sodium tartrate, 1.0g of polydimethylsiloxane, 0.8g of hydroxypropyl methyl cellulose ether, 0.5g of polycarboxylic acid water reducing agent and 5g of redispersible emulsion powder into the composite powder material per gram, and fully mixing to obtain the gypsum mortar powder.
Example 3
Mixing 1000g phosphogypsum (pH value 3.2) and 100g papermaking white mud (pH value 12.7), calcining at 130 deg.C for 1 hr, and ball milling in ball mill for 1 hr to obtain phosphogypsum with pH value of about 6.0 and specific surface area of 4500cm2The composite powder material of per gram is added with the powder material with the particle diameter of 50-100nm100g of zinc oxide powder, 240g of blast furnace slag powder of 40 meshes and 80 meshes, 1.2g of sodium citrate, 1.2g of polydimethylsiloxane, 0.8g of hydroxypropyl methyl cellulose ether, 0.5g of polycarboxylic acid water reducing agent and 5g of redispersible emulsion powder are fully mixed to obtain the gypsum mortar powder.
Example 4
Mixing 1000g phosphogypsum (pH value is 3.0) with 80g papermaking white mud (pH value is 12.7), calcining at 140 deg.C for 0.5 hr, and ball milling in ball mill for 1 hr to obtain phosphogypsum with pH value of about 5.7 and specific surface area of 4000cm2And adding 240g of each of 50g of carbon nano tubes with the particle size of 50-100nm, 240g of blast furnace slag powder with 40 meshes and 80 meshes, 0.6g of citric acid, 1.0g of polydimethylsiloxane, 1.2g of hydroxypropyl methyl cellulose ether, 0.8g of polycarboxylic acid water reducing agent and 5g of redispersible latex powder into the composite powder material per gram, and fully mixing to obtain the gypsum mortar powder.
Comparative example 1
Mixing 1000g phosphogypsum (pH value is 3.0) and 80g papermaking white mud (pH value is 12.7), calcining at 150 deg.C for 1 hr, and ball milling in ball mill for 1 hr to obtain phosphogypsum with pH value of about 5.7 and specific surface area of 4000cm2And adding 240g of blast furnace slag powder of 40 meshes and 80 meshes, 0.6g of sodium citrate, 1.0g of polydimethylsiloxane, 0.8g of hydroxypropyl methyl cellulose ether, 0.5g of polycarboxylic acid water reducing agent and 5g of redispersible emulsion powder into the composite powder material per gram, and fully mixing to obtain the gypsum mortar powder.
Comparative example 2
Mixing 1000g phosphogypsum (pH value 3.2) with 10g lime, calcining at 150 deg.C for 0.5 hr, and ball milling in ball mill to obtain phosphogypsum with pH value of about 6.5 and Boehringer specific surface area of 4000cm2And adding 100g of cement, 200g of quartz sand of 40 meshes and 80 meshes, 0.8g of sodium citrate, 1.0g of polydimethylsiloxane, 1.0g of hydroxypropyl methyl cellulose ether, 0.5g of polycarboxylic acid water reducing agent and 5g of redispersible emulsion powder into the powder per gram, and fully mixing to obtain the gypsum mortar powder.
Performance testing
Testing the flow property, setting time, strength and shrinkage rate of the self-leveling mortar prepared from the gypsum mortar powder prepared in the embodiment and the comparative example according to the building material industry standard JC/T1023-2007 gypsum-based self-leveling mortar of the people's republic of China; the thermal conductivity of the self-leveling mortar prepared from the gypsum mortar powders prepared in the above examples and comparative examples was measured by using a flat plate heat flow meter method according to the national standard GB/T10295-2008 "heat flow meter method for measuring the steady-state thermal resistance and related characteristics of a heat insulating material" and ASTM C518-04 "test method for measuring the steady-state heat flux and heat transfer characteristics by using the heat flow meter method". The test results are shown in table 1.
TABLE 1
It can be seen from comparison of example 4 and comparative example 1 that the addition of the heat conductive material does not bring adverse effects to the fluidity loss, setting time, strength and shrinkage of the self-leveling mortar, and the fluidity loss, setting time, strength and shrinkage of the self-leveling mortar prepared from the gypsum mortar powder of the example are similar to those of the self-leveling mortar prepared from the gypsum mortar powder of comparative example 2, all meeting the requirements of JC/T1023 2007, which indicates that the introduction of the papermaking white mud and the heat conductive material does not have adverse effects on the performance of the mortar, and the phosphogypsum and the papermaking white mud can completely replace the cement, thereby reducing the production cost and realizing the resource reutilization of solid wastes. In addition, compared with the mortars prepared by the comparative examples 1 and 2 without adding heat conduction materials, the gypsum mortar containing the heat conduction materials in the embodiment of the application has a significantly higher heat conduction coefficient, which shows that the phosphogypsum-based heat conduction self-leveling mortar in the embodiment of the application can be used for filling gaps of floor heating pipelines and covering surfaces of upper layers.
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 (7)
1. A gypsum-based heat-conducting self-leveling mortar is characterized in that,
the preparation raw materials of the gypsum-based heat-conducting self-leveling mortar comprise phosphogypsum, papermaking white mud, heat-conducting material, aggregate, retarder, defoamer, water-retaining agent, water-reducing agent and redispersible latex powder, and cement is not included,
wherein the addition amount of the papermaking white mud is 8-15 parts by weight based on 100 parts by weight of the addition amount of the phosphogypsum;
wherein the addition amount of the heat conducting material is 5-10 parts by weight based on 100 parts by weight of the addition amount of the phosphogypsum; and is
The phosphogypsum-containing water-reducing agent comprises, by weight, 100 parts of phosphogypsum, 40-48 parts of aggregate, 0.06-0.1 part of retarder, 0.06-0.12 part of defoamer, 0.06-0.12 part of water-retaining agent, 0.03-0.08 part of water-reducing agent and 0.2-0.7 part of redispersible latex powder.
2. The gypsum-based thermally conductive self-leveling mortar of claim 1, wherein the thermally conductive material is selected from any one or more of aluminum oxide, zinc oxide, silicon carbide, carbon nanotubes, aluminum nitride, and boron nitride.
3. The gypsum-based thermally conductive self-leveling mortar of any one of claims 1-2, wherein the aggregate is blast furnace slag powder, the set retarder is sodium citrate, citric acid, or sodium tartrate, the defoamer is polydimethylsiloxane, the water retention agent is hydroxypropyl methyl cellulose ether, and the water reducing agent is a polycarboxylic acid water reducing agent.
4. The method for preparing the gypsum-based thermally conductive self-leveling mortar according to any one of claims 1 to 3, wherein the method comprises:
mixing the phosphogypsum and the papermaking white mud, calcining and ball-milling; and
mixing the ball-milled phosphogypsum and papermaking white mud with heat conduction materials, aggregates, retarders, defoaming agents, water-retaining agents, water reducing agents and redispersible latex powder.
5. The preparation method as claimed in claim 4, wherein the calcination is carried out at a temperature of 130-150 ℃ for a period of 0.5-1 hour.
6. The preparation method according to claim 4, wherein the Boehringer specific surface area of the ball-milled phosphogypsum and papermaking white mud is 4000-5500cm2/g。
7. Use of the gypsum-based thermally conductive self-leveling mortar according to any one of claims 1 to 3 for floor heating pipe gap filling and upper cladding.
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| CN201910354142.0A CN111606648B (en) | 2019-04-29 | 2019-04-29 | Gypsum-based heat-conducting self-leveling mortar and preparation method and application thereof |
| PCT/CN2019/103405 WO2020220542A1 (en) | 2019-04-29 | 2019-08-29 | Ardealite self-leveling mortar, and preparation method therefor and application thereof |
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| CN112645673A (en) * | 2020-12-23 | 2021-04-13 | 地王(上海)建筑材料有限公司 | Novel heat-conducting material synthesized by utilizing gypsum tribasic soil |
| CN113135731A (en) * | 2021-05-19 | 2021-07-20 | 上海三棵树防水技术有限公司 | Special gypsum-based self-leveling mortar for indoor floor heating and preparation method thereof |
| CN113185255A (en) * | 2021-05-19 | 2021-07-30 | 上海三棵树防水技术有限公司 | Special cement-based self-leveling mortar for indoor floor heating and preparation method thereof |
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| JPS5617959A (en) * | 1979-07-25 | 1981-02-20 | Osaka Cement | Manufacture of high strength mortar and concrete |
| CN1211309C (en) * | 2002-08-09 | 2005-07-20 | 孙国庆 | Modified phosphogypsum and its preparation |
| CN103482896B (en) * | 2013-09-09 | 2015-07-15 | 四川大学 | Phosphogypsum ball and preparation method and application thereof |
| CN106007622B (en) * | 2016-05-24 | 2018-08-24 | 福建建工建材科技开发有限公司 | A kind of half water desulfurized gypsum base surfacing self-leveling floor mortar of β types |
| CN108238752B (en) * | 2016-12-23 | 2022-12-13 | 武汉纺织大学 | Heat storage concrete based on super absorbent resin and preparation method thereof |
| CN108129122A (en) * | 2018-01-16 | 2018-06-08 | 四川华邦保和涂料有限公司 | A kind of preparation method of phosphorus paring stone cream base lightweight gravity flowing levelling mortar |
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