CN107352909B - Special finishing mortar for foam glass heat insulation system and preparation method and use method thereof - Google Patents
Special finishing mortar for foam glass heat insulation system and preparation method and use method thereof Download PDFInfo
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- CN107352909B CN107352909B CN201710650625.6A CN201710650625A CN107352909B CN 107352909 B CN107352909 B CN 107352909B CN 201710650625 A CN201710650625 A CN 201710650625A CN 107352909 B CN107352909 B CN 107352909B
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- rubber powder
- heat insulation
- mortar
- foam glass
- insulation system
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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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent 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
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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)
- Building Environments (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention relates to the technical field of plastering mortar, in particular to special plastering mortar for a foam glass heat-insulating system and a preparation method and a using method thereof, which are characterized by being prepared from the following raw materials in percentage by weight: 20-40% of 42.5-grade cement; 33-41% of 50-100 mesh dry fine yellow sand; 23% -31% of 40-70 mesh dry medium yellow sand; 2.7 to 5 percent of redispersible rubber powder; 1 to 2 percent of hydrophobic rubber powder; 0.1 to 0.5 percent of cellulose ether; 0.2 to 0.5 percent of wood fiber. Compared with the prior art, the invention can greatly improve various performance indexes of the plastering layer of the external heat insulation system, such as bonding strength, shock resistance, cracking resistance, water resistance and the like.
Description
Technical Field
The invention relates to the technical field of finishing mucilage, in particular to special finishing mucilage for a foam glass heat-insulating system and a preparation method and a use method thereof.
Background
The external heat-insulating system for thin-plastered external wall of building is widely used in various building engineering, is a building energy-saving technology widely popularized by national industrial policy, and consists of a base wall, an adhesive layer, a heat-insulating material layer, a plastering layer made of plastering mortar and mesh cloth, and a finishing layer. The heat insulation system can effectively prevent the heat conduction of the wall body and improve the heat insulation performance of the building.
The coating mortar is used as a protective layer material in an external thermal insulation system, is a very important part in the thermal insulation system, plays a role in starting and stopping, is coated outside the thermal insulation material, protects the thermal insulation material, and provides a stable foundation for later decoration and construction.
The rendering coat mortar also has an important function of balancing the stress caused by the change of the environmental temperature. For example, in summer when sunlight is direct, heat absorbed by a wall surface which is not subjected to external heat insulation can be transferred through the wall body, so that the surface temperature can be 40-60 ℃; when the heat-insulating layer is arranged on the surface of the outer wall, the heat conductivity coefficient of the heat-insulating material is generally very low, the heat absorbed by the outer layer is not easy to diffuse through heat conduction, and the temperature of the surface of the outer wall can reach 50-70 ℃ or even 80 ℃. And in long-term use, the paint needs to undergo hot rain circulation and freeze-thaw change and bear certain wind pressure. The stress caused by the environmental change mainly acts on the rendering coat mortar, so that quite high requirements are put on the bonding strength, the mechanical strength and the flexibility of the rendering coat mortar, otherwise, the rendering coat is easy to crack and fall off, and the effectiveness and the stability of the heat-insulating system in long-term use are related.
At present, most organic foaming heat-insulating materials used in the market have elasticity, and are matched with common cement-based plastering mortar, so that the problem in the aspect of flexibility is solved, but the organic heat-insulating materials have the safety problem of easy combustion, and therefore, the use of the organic foaming heat-insulating materials in the aspect of building heat insulation is limited to a certain extent.
The foam glass has light volume weight (less than or equal to 160 kg/m)3) Inorganic heat-insulating materials which are nonflammable, high in strength, low in heat conductivity coefficient and good in weather resistance are increasingly applied to the field of building heat insulation at present. For a long time, one of the reasons that foam glass is not applied to the heat insulation of the outer wall of a building in a large area is that the foam glass is used as a finishing layer material outside a foam glass heat insulation system, and the technical performance indexes of finishing mortar do not meet the use requirements. Because the foam glass is a light fragile material, the rendering coat mortar is a material which is applied outside the foam glass to play a role in protection, for example, the bonding force between the rendering coat mortar and the foam glass is too small, and the bonding strength is not enough and is easy to fall off; if the adhesive force is too large, the foam glass can crack. If the general rigid cement-based plastering mortar on the market is matched with a cement mortar block, the bonding strength, the surface impact resistance and the weather resistance are not problematic, and if the plastering mortar is matched with foam glass, the shrinkage force of the plastering mortar during drying can crack the foam glass, the structure of a heat insulation system is damaged, and the heat insulation material falls off. Therefore, cement-based inorganic rendering cements that match foam glass have their special requirements.
According to the standard requirements of JG/T469-:
1. tensile bond strength (with foam glass plate)
1) Original strength: not less than 0.1 MPa;
2) soaking in water for 48h, and drying for 2h (h) until the strength is more than or equal to 0.06 MPa;
3) soaking in water for 48h, and drying for 7d (days) until the strength is more than or equal to 0.1 MPa;
4) the freeze-thaw resistance strength is more than or equal to 0.1 MPa;
2. the folding ratio is less than or equal to 3.0;
3. water impermeability: the inner side of the sample rendering layer is free from water penetration;
4. impact resistance: grade 3J;
the tensile bonding strength of the bonding with the foam glass plate is the basic performance of the rendering coat mortar, and comprises the original strength, the strength after soaking and the strength after freeze thawing.
Besides ensuring basic tensile bonding strength, the finishing mucilage also has certain flexibility, otherwise, in natural environments of sun, rain and alternate cold and heat, the finishing layer can crack, water can seep when raining, the heat conductivity coefficient of the material is increased, the heat insulation performance is influenced, water in the finishing layer can be vaporized and expanded when the temperature is high, hollowing and falling of the finishing layer are easy to occur, and even safety quality accidents occur. The flexibility is expressed by the ratio of the compressive strength and the flexural strength of the material, namely, the compression ratio, the smaller the compression ratio, the better the flexibility of the characterization material, and the larger the compression ratio, the better the rigidity of the characterization material.
The water impermeability means that the finishing layer cannot be penetrated by water under the normal use condition, such as water permeability, and the result is the same as that of the cracking of the finishing layer, so that the finishing mortar is required to have good water resistance.
The protective layer used as the heat insulation system also requires that the finishing layer has certain impact strength to resist normal impact in use, so the folding ratio of the material cannot be too small, otherwise, the surface hardness is not enough, and the impact resistance of the material cannot meet the requirement.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a finishing mortar which not only has better cohesive force, but also has enough impact resistance, impermeability, deformation resistance and excellent weather resistance.
In order to achieve the purpose, the special plastering mortar for the foam glass heat insulation system is designed, and is characterized by being prepared from the following raw materials in percentage by weight:
the redispersible rubber powder adopts vinyl acetate/ethylene copolymer rubber powder.
The hydrophobic rubber powder is German Wake 8034H rubber powder.
The cellulose ether is German Bayer WALOCEL MKX 45000PF 20L.
A preparation method of special plastering mortar for a foam glass heat insulation system is characterized by comprising the following preparation steps:
(1) weighing the raw materials according to the weight percentage;
(2) firstly, mixing and stirring cement, dry fine yellow sand and dry medium yellow sand for 10 minutes by using a stirrer, wherein the stirring speed is 120 r/min;
(3) then adding the redispersible rubber powder, the hydrophobic rubber powder, the cellulose ether and the wood fiber, and continuing to stir for 20 minutes by using a stirrer, wherein the stirring speed is 120 r/min;
(4) and discharging and packaging.
A use method of special plastering mortar for a foam glass heat insulation system is characterized in that the plastering mortar is mixed with water according to the mass ratio of 1:0.22, then a manual hand-held electric stirrer is used for stirring for 3-5min, standing for 5min, then stirring for 3-5min, and then plastering on the outer surface of a heat insulation layer.
Compared with the prior art, the invention can greatly improve various performance indexes of the plastering layer of the external heat insulation system, such as bonding strength, shock resistance, cracking resistance, water resistance and the like.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
The special coating mortar for the foam glass heat insulation system in the embodiment is prepared from the following raw materials in percentage by weight:
in the example, the cement is 42.5 grade common portland cement of conch brand, and is a main cementing material in the special plastering mortar;
the yellow sand is an essential base material in the cement-based rendering coat mortar and plays a role in framework and support in the whole formula system. Considering that the water absorption of the mortar is influenced by the compactness of the structure of the hardened body, the invention adopts the grading of the sand with two particle sizes to carry out the closest packing design, and can reduce the water absorption of the mortar, thereby improving the water resistance of the plastering mortar.
The redispersible rubber powder adopts German wakker
5044N is a water-redispersible vinyl acetate/ethylene copolymer rubber powder, the glass transition temperature Tg of the rubber powder adopted in the invention is-7 ℃, the lowest film forming temperature is below 0 ℃, the rubber powder is added to improve the adhesive force, the breaking strength, the plasticity, the wear resistance and the workability of the material, and the fluidity, the thixotropy, the water retention property and the like of the material, and the flexibility of the finishing mortar can be ensured even in cold winter due to the lower Tg.
The hydrophobic rubber powder adopts German Wake
8034H, minimum film-forming temperature of 0 deg.C, and the purpose of adding the rubber powder is to make it have water repellency and prevent water from soaking. Is favorable for improving the water-resistant tensile bonding strength of the rendering coat mortar.
The cellulose ether used was Bayer WALOCEL MKX 45000PF 20L, Germany, and its viscosity was 25 Pa.S. The cellulose ether is used as the water-retaining agent, plays a role in water retention and thickening in the plastering mortar, and can effectively prevent the phenomena of strength reduction and plastering layer cracking caused by too fast drying and insufficient hydration of the plastering mortar, thereby improving the tensile bonding original strength and the water-resistant strength of the plastering mortar and ensuring the firmness and the durability of the plastering layer. The introduction of the cellulose ether also improves the homogeneity of the rendering coat mortar, thereby improving the construction performance.
Wood fibre is one of the plant fibres, in this case JRS ARBOCEL wood fibre, germany. The wood fiber has a thixotropic function besides the thickening function of the fiber, and when the wood fiber is used, a system shows lower viscosity when higher shearing force is applied to the rendering coat mortar; when a lower shearing force is applied to the system, the system shows higher viscosity, and the function of the wood fiber ensures that the plastering mortar is easy to smear and convenient to construct during construction. The wood fiber also has a good water guide function, and can prolong the open time of plastering mortar construction, namely the operation time. The most important function of the wood fiber is that when the rendering coat mortar is subjected to fracture resistance, the fiber can play a role in connecting cracks and preventing the cracks from developing, and the crack resistance of the rendering coat mortar is effectively improved.
Example 2
The embodiment is a preparation method of special plastering mortar for a foam glass heat insulation system, and the preparation method comprises the following preparation steps:
(1) weighing the raw materials according to the weight disclosed in the embodiment;
(2) firstly, mixing and stirring cement, dry fine yellow sand and dry medium yellow sand for 10 minutes by using a stirrer, wherein the stirring speed is 120 r/min;
(3) then adding the redispersible rubber powder, the hydrophobic rubber powder, the cellulose ether and the wood fiber, and continuing to stir for 20 minutes by using a stirrer, wherein the stirring speed is 120 r/min; the mixing and stirring of the dry powder plastering mortar is an important process in the production process, and requires that cement and other additive materials are uniformly distributed on the surface of aggregate, so that a high-quality plastering mortar product can be obtained;
(4) and discharging and packaging.
The plastering mortar prepared in the invention is used by adding water, and in a construction site, the plastering mortar and the water are mixed according to the mass ratio of 1:0.22, then stirred for 3-5min by a manual hand-held electric stirrer, kept stand for 5min, stirred for 3-5min and then smeared on the outer surface of the heat insulation layer.
The special plastering adhesive cement prepared by the invention is issued by Shanghai Jianke inspection Limited company in 2016, 9 and 1 days and has the following serial numbers: the results of the test report for JR6W8-160006 are given in the following Table:
the finishing mucilage solves the matching problem between the foam glass and other materials in the external heat insulation system, and a large number of engineering practices prove that the finishing mucilage can ensure the stability, safety and reliability of the external heat insulation system and has enough tensile bonding strength, impact resistance, water resistance, freeze-thaw resistance, folding ratio and other performances.
The cement is a main cementing material, the rubber powder is a thickening agent, the cellulose ether is a water-retaining agent, and the wood fiber is used as an anti-cracking agent. The special plastering mortar produced by repeatedly testing, detecting and adjusting the formula of the invention has various technical performance indexes which meet or exceed the requirements of national industrial standards, and a large amount of engineering applications prove that the foam glass heat-insulating system made of the product of the invention is stable, safe and reliable.
Claims (4)
1. The special plastering mortar for the foam glass heat insulation system is characterized by being prepared from the following raw materials in percentage by weight:
the redispersible rubber powder adopts vinyl acetate/ethylene copolymer rubber powder;
the hydrophobic rubber powder is German Wake 8034H rubber powder.
2. The special coating mortar for foam glass insulation system of claim 1, wherein the cellulose ether is Bayer WALOCEL MKX 45000PF 20L.
3. The preparation method of the special rendering coat mortar for the foam glass heat insulation system as claimed in any one of claims 1 to 2, characterized by comprising the following preparation steps:
(1) weighing the raw materials according to the weight percentage;
(2) firstly, mixing and stirring cement, dry fine yellow sand and dry medium yellow sand for 10 minutes by using a stirrer, wherein the stirring speed is 120 r/min;
(3) then adding the redispersible rubber powder, the hydrophobic rubber powder, the cellulose ether and the wood fiber, and continuing to stir for 20 minutes by using a stirrer, wherein the stirring speed is 120 r/min;
(4) and discharging and packaging.
4. A use method of the special rendering coat mortar for the foam glass heat insulation system according to any one of claims 1-2, characterized in that the rendering coat mortar and water are mixed according to the mass ratio of 1:0.22, then stirred by a manual hand-held electric stirrer for 3-5min, kept still for 5min, stirred for 3-5min, and then smeared on the outer surface of the heat insulation layer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710650625.6A CN107352909B (en) | 2017-08-02 | 2017-08-02 | Special finishing mortar for foam glass heat insulation system and preparation method and use method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710650625.6A CN107352909B (en) | 2017-08-02 | 2017-08-02 | Special finishing mortar for foam glass heat insulation system and preparation method and use method thereof |
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| CN107352909A CN107352909A (en) | 2017-11-17 |
| CN107352909B true CN107352909B (en) | 2020-09-11 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108821703A (en) * | 2018-09-05 | 2018-11-16 | 马鞍山十七冶工程科技有限责任公司 | A kind of exterior-wall heat insulation finishing mucilage and preparation method thereof |
| CN109439054B (en) * | 2018-12-26 | 2021-11-12 | 亚士漆(上海)有限公司 | Putty powder and putty slurry for plastering-free machine, and preparation method and application thereof |
| CN111747705A (en) * | 2020-06-12 | 2020-10-09 | 上海大学 | Preparation method and application of special bonding mortar material for foam glass external thermal insulation system |
| CN116177947A (en) * | 2022-10-08 | 2023-05-30 | 深圳市恒祥建设工程有限公司 | Foam concrete main material |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101456714A (en) * | 2008-12-23 | 2009-06-17 | 兰州鹏飞保温隔热有限公司 | Surface mortar for heat insulation system of foam glass building |
| CN105016680A (en) * | 2015-07-08 | 2015-11-04 | 重庆市胡特建材有限公司 | Fireproof rendering coat mortar and preparation method and application thereof |
| CN105859214A (en) * | 2016-03-31 | 2016-08-17 | 黄山瑞盛新材料科技有限公司 | Polystyrene board rendering coat mortar dry powder |
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2017
- 2017-08-02 CN CN201710650625.6A patent/CN107352909B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101456714A (en) * | 2008-12-23 | 2009-06-17 | 兰州鹏飞保温隔热有限公司 | Surface mortar for heat insulation system of foam glass building |
| CN105016680A (en) * | 2015-07-08 | 2015-11-04 | 重庆市胡特建材有限公司 | Fireproof rendering coat mortar and preparation method and application thereof |
| CN105859214A (en) * | 2016-03-31 | 2016-08-17 | 黄山瑞盛新材料科技有限公司 | Polystyrene board rendering coat mortar dry powder |
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