CN111606631A - Thin-layer plastering mortar and preparation method thereof - Google Patents

Thin-layer plastering mortar and preparation method thereof Download PDF

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Publication number
CN111606631A
CN111606631A CN202010569702.7A CN202010569702A CN111606631A CN 111606631 A CN111606631 A CN 111606631A CN 202010569702 A CN202010569702 A CN 202010569702A CN 111606631 A CN111606631 A CN 111606631A
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China
Prior art keywords
emulsion
starch
mortar
thin
stirring
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Chinese (zh)
Inventor
李会全
庄梓豪
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Shenzhen Yidongyang Building Material Co ltd
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Shenzhen Yidongyang Building Material Co ltd
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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
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24—Macromolecular compounds
    • C04B24/38—Polysaccharides or derivatives thereof
    • 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
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24—Macromolecular compounds
    • C04B24/38—Polysaccharides or derivatives thereof
    • C04B24/383—Cellulose or derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B31/00—Preparation of derivatives of starch
    • C08B31/08—Ethers
    • C08B31/12—Ethers having alkyl or cycloalkyl radicals substituted by heteroatoms, e.g. hydroxyalkyl or carboxyalkyl starch
    • 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
    • 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

Abstract

The invention discloses a thin-layer plastering mortar and a preparation method thereof, wherein the mortar comprises cement, fly ash, fine sand, cellulose, a thixotropic agent, starch ether, sodium gluconate, latex powder and an air entraining agent, and the weight ratio of the cellulose to the starch ether is 1 (0.1-0.8). The preparation method comprises the following steps: first and second mixed materials are respectively prepared, and then the first mixed material and the second mixed material are mixed to uniformly mix the mortar. The thin-layer plastering mortar can be used for plastering light walls, and has the advantages of moderate tensile strength, better compressive strength and difficult foaming in construction.

Description

Thin-layer plastering mortar and preparation method thereof
Technical Field
The invention relates to the field of mortar, in particular to thin-layer plastering mortar and a preparation method thereof.
Background
The mortar mainly comprises masonry mortar, plastering mortar and ground mortar. Wherein, the plastering mortar is prepared by cement, aggregate and various additives. The mortar is suitable for plastering lightweight walls such as aerated concrete blocks, fly ash blocks, ceramsite bricks and the like and high-water-absorption materials.
When plastering a light wall, mortar with high viscosity is needed. At present, in a common mortar formula, cellulose is usually added to improve the viscosity of mortar, improve the tensile bonding strength of mortar and strengthen the connection between mortar and a wall body.
However, when the mortar is applied to a wall during plastering, the surface of the mortar is found to be foamed after the mortar is dried. After the foaming condition occurs on the surface of the mortar, the mortar is easy to crack, and along with the change of temperature and humidity, the mortar is easy to crack in areas with large temperature difference, so that the plastering quality of a wall is poor, and a thin-layer plastering mortar is needed urgently at present, and the foaming condition can not occur after the mortar is coated.
Disclosure of Invention
In view of the disadvantages of the prior art, a first object of the present invention is to provide a thin layer plastering mortar which has the advantage of not easily foaming.
The second purpose of the invention is to provide a preparation method of the thin-layer plastering mortar, which is used for preparing the thin-layer plastering mortar.
In order to achieve the first object, the invention provides the following technical scheme: the thin-layer plastering mortar consists of the following components in parts by weight:
200-250 parts of cement;
45-55 parts of fly ash;
600-650 parts of fine sand;
1-2 parts of cellulose;
0.5-0.8 part of thixotropic agent;
0.1-1.6 parts of starch ether;
1-2 parts of sodium gluconate;
100-120 parts of latex powder;
0.02-0.05 part of air entraining agent;
the weight ratio of the cellulose to the starch ether is 1 (0.1-0.8).
By adopting the technical scheme, cement and fly ash are used as gel materials, and fine sand is added into the gel materials, so that the strength of the mortar can be improved. In addition, after the fine sand is added, the foaming degree of the mortar in the construction process can be reduced. The addition of cellulose can improve the viscosity of the mortar and enhance the bonding relation between the mortar and the wall. However, when the cellulose is added separately, the viscosity of the mortar may be too high, and when the viscosity of the mortar is too high, foaming is easy to occur during construction. If the viscosity is too low, the mortar is fragile after hardening and the quality is not good enough. The addition of the starch ether can properly reduce the viscosity, but does not cause the reduction of the strength of the mortar, but can be cooperated with cellulose to improve the mechanical property of the mortar when the viscosity of the mortar is integrally improved and is moderate. In addition, the cellulose and the starch ether have better water retention property, and the water retention property of the mortar is improved. In addition, after the thixotropic agent is combined, the mortar can keep better fluidity when in use, so that the construction is more convenient. The sodium gluconate is a retarder and can cooperate with the thixotropic agent to ensure that the mortar has better fluidity, the solidification time is prolonged, and the construction is convenient. The latex powder can improve the bonding capability of the mortar and can effectively improve the water resistance and the construction property of the mortar. In addition, the latex powder can be well combined with cellulose, and the mechanical property of the mortar is enhanced. The air entraining agent can generate a large amount of micro bubbles when the mortar is mixed, improve the water retention property of the mortar, enhance the air permeability of the mortar and reduce the possibility of foaming and cracking of the mortar.
Further, the starch ether is modified starch ether, and is prepared by the following steps:
s1: preparing starch emulsion, namely adding water into corn starch to prepare the starch emulsion with the weight percentage of 30-40%;
s2: adding acid: mixing citric acid and succinic acid according to the proportion of 1 (1-2), and adding the mixture into a starch emulsion, wherein the weight ratio of the citric acid to the corn starch is (0.1-0.25): 1, uniformly stirring to prepare a mixed emulsion;
s3: and (3) moist heat treatment: adding nano silver into the mixed emulsion, wherein the weight of the nano silver is 0.01-0.25% of the weight of the corn starch, uniformly stirring, heating the mixed emulsion to 120 ℃ at the same time, pressurizing at the pressure of 0.10-0.20MPa for 1-2h, adding, cooling, separating and drying to obtain pretreated starch;
s4: etherification: preparing the pretreated starch into 20-25 wt% of emulsion, adding sodium hydroxide into the emulsion to ensure that the pH value of the solution is 8.2-9.5, averagely adding an etherifying agent which accounts for 1-1.5 wt% of the modified starch for 3 times, stirring while raising the temperature to 30-45 ℃, reacting for 4-6h, filtering, separating, drying, preparing the dried substance into 40-45 wt% of emulsion, adding sodium dodecyl sulfate which accounts for 2-4 wt% of the emulsion into the emulsion, uniformly stirring, performing ultrasonic treatment for 10-20min, separating, and drying to obtain the modified starch ether.
By adopting the technical scheme, the corn starch is firstly acidified and activated, the nano silver is added after acidification, the corn starch is uniformly stirred and then subjected to wet heat treatment, and the corn starch is heated and pressurized to modify the starch, so that the viscosity of the corn starch is reduced to some extent, and the antibacterial capacity of the corn starch is improved. However, the water solubility is lowered, so that the concentration of the prepared product is lowered during etherification, and during etherification, the pH is adjusted to have etherification conditions, and then an etherifying agent is added for etherification, so that some gelatinization byproducts are generated during etherification, so that the gelatinization byproducts can be filtered by the filtration step. The water solubility of the etherified starch ether is increased, and then the sodium dodecyl sulfate is added into the starch ether to continuously modify the surface of the starch ether, so that the starch ether can be easily mixed with other substances in the thin-layer plastering mortar, and the effect is better.
Further, in the step 4, the pH value of the solution is adjusted to 8.5.
By adopting the technical scheme, when the pH value of the solution is 8.5, the concentration of hydroxyl in the solution is moderate, and the reaction rate is moderate in the etherification process.
Further, in step S4, the etherifying agent is trimethyl (3-chloro-2-hydroxypropyl) ammonium chloride.
By adopting the technical scheme, trimethyl (3-chloro-2-hydroxypropyl) ammonium chloride can be used for etherifying starch to produce corresponding starch ether, so that the prepared modified starch ether can be well dispersed in mortar, can be well cooperated with substances such as cellulose in the mortar, and ensures that the viscosity of the mortar is moderate.
Further, the modified starch ether is prepared by the following steps:
s1: preparing starch emulsion, namely adding water into corn starch to prepare starch emulsion with the weight percentage of 35%;
s2: adding acid: mixing citric acid and succinic acid according to the ratio of 1: 1.5 and adding the mixture into starch emulsion, wherein the weight ratio of citric acid to corn starch is 0.2: 1, uniformly stirring to prepare a mixed emulsion;
s3: and (3) moist heat treatment: adding nano silver into the mixed emulsion, wherein the weight of the nano silver is 0.2 percent of that of the corn starch, uniformly stirring, heating the mixed emulsion to 120 ℃, simultaneously pressurizing, cooling, separating and drying after adding, wherein the pressure is 0.20MPa, and the heating time is 1.5h, so as to obtain pretreated starch;
s4: etherification: preparing the pretreated starch into 22 wt% emulsion, adding sodium hydroxide into the emulsion to ensure that the pH value of the solution is within 8.5, averagely adding trimethyl (3-chloro-2-hydroxypropyl) ammonium chloride accounting for 1.2 wt% of the modified starch for 3 times, stirring while raising the temperature to 40 ℃, reacting for 5 hours, filtering, separating and drying, preparing the dried substance into 45 wt% emulsion, adding sodium dodecyl sulfate accounting for 3 wt% of the emulsion, uniformly stirring, performing ultrasonic treatment for 15 minutes, separating and drying to obtain the modified starch ether.
By adopting the technical scheme, when the modified starch ether prepared according to the specific proportion is compared with unmodified starch ether, the addition amount of the modified starch ether is less during addition, so that the mortar with proper viscosity can be obtained, and the mechanical property of the obtained mortar is good. Wherein, when the starch is pretreated, the ratio of citric acid to succinic acid is 1: the proportion of 1.5 is prepared, and the effect is better when the starch is acidified and activated. In addition, the added nano silver can effectively prolong the shelf life of the starch. During etherification, trimethyl (3-chloro-2-hydroxypropyl) ammonium chloride is adopted to carry out etherification on starch, and when the temperature is 40 ℃, the etherification rate is moderate and the reaction is complete. And finally, adding the lauryl sodium sulfate to increase branched chains on the surface of the mortar, so that the mortar is more easily dispersed.
Further, the cellulose is hydroxypropyl methylcellulose.
After the hydroxypropyl methyl cellulose is added into the mortar, the hydroxypropyl methyl cellulose has better viscosity, can improve the bonding strength of the mortar, and can be well cooperated with starch ether to ensure that the viscosity of the mortar is moderate and the mortar has better water-retaining property.
Further, the air entraining agent is one of sodium dodecyl benzene sulfonate, sodium dodecyl sulfate, sodium fatty alcohol-polyoxyethylene ether sulfate or alpha-sodium alkenyl sulfonate.
By adopting the technical scheme, the sodium dodecyl benzene sulfonate, the sodium dodecyl sulfate, the sodium fatty alcohol-polyoxyethylene ether sulfate or the alpha-alkenyl sodium sulfonate are added into the mortar, so that uniform micro bubbles can be generated, the quality of the mortar can be effectively improved, and the water retention property of the mortar is improved.
Further, the air entraining agent is sodium dodecyl sulfate.
By adopting the technical scheme, the lauryl sodium sulfate is added into the mortar, uniform and fine micro bubbles can be generated, the mortar has better air permeability, and when the mortar is smeared on a wall, the mortar can be effectively prevented from foaming due to air impermeability.
Further, the weight ratio of the cellulose to the starch ether is 1: 0.6.
by adopting the technical scheme, experiments prove that when the weight ratio of the cellulose to the starch ether is 1:0.6, the prepared mortar product has better quality. When the cellulose is excessive, the bonding strength of the mortar is increased, but the compressive strength is slightly reduced. When the starch ether is excessive, the viscosity of the mortar is reduced.
Further, the thin-layer plastering mortar consists of the following components in parts by weight:
220 parts of cement;
50 parts of fly ash;
620 parts of fine sand;
1.5 parts of cellulose;
0.6 part of thixotropic agent;
0.9 part of modified starch ether;
1.5 parts of sodium gluconate;
110 parts of latex powder;
0.04 part of air entraining agent.
By adopting the technical scheme, the thin-layer plastering mortar prepared by adopting the proportion has better mechanical property and water retention property, and in addition, the thin-layer plastering mortar does not foam and has better quality during construction.
In order to achieve the second object, the invention provides the following technical scheme: a preparation method of thin-layer plastering mortar comprises the following steps:
the method comprises the following steps: preparing a first mixed material: uniformly mixing cellulose, a thixotropic agent, starch ether, sodium gluconate, emulsion powder and an air entraining agent.
Step two: preparing a second mixed material: uniformly mixing cement, fly ash and fine sand;
step three: adding the first mixture into the second mixture for 1-3 times, stirring while adding, stirring for 3-5min, and stirring at 10-60 deg.C.
Through adopting above-mentioned technical scheme, prepare first compounding and second compounding respectively earlier, because the equal granule of the material in the first compounding is less, so compare like this in whole mixings together in adding the second compounding behind its misce bene, mixing time is shorter, and mixes comparatively evenly. When mixing, the first mixed material is added into the second mixed material for 1-3 times on average, so that the first mixed material is mixed uniformly. The stirring time is 3-5min, and the mixture can be well mixed.
Further, the method for preparing the thin-layer plastering mortar of claim 7, wherein in the third step, the first mixture is added into the second mixture in 2 times on average, stirring is carried out while adding, the adding interval is 1min, and stirring is carried out for 4 min.
By adopting the technical scheme, when the first mixed material part is averagely added into the second mixed material twice, the adding interval is 1min, and the mixture is stirred for 4min, so that the uniform thin-layer plastering mortar can be obtained.
Further, in the third step, the stirring temperature is 20 ℃.
By adopting the technical scheme, the components can be uniformly mixed in a short time at the temperature of 20 ℃. And the temperature of 20 ℃ is room temperature, so that the requirement on the environment is not harsh, and the production difficulty is reduced.
In conclusion, the invention has the following beneficial effects:
firstly, the mortar prepared by the invention has better mechanical property, and in addition, the mortar also has better water retention property, and the foaming condition can not occur during coating.
Secondly, the modified starch ether is preferably adopted in the invention, compared with the common starch ether, the modified starch ether can better cooperate with cellulose, so that the viscosity of the mortar is kept moderate while the strength of the mortar is improved, and the foaming of the mortar during coating is prevented.
Thirdly, the method of the invention can mix all the materials uniformly in a short time because the first mixed material and the second mixed material are mixed firstly and then are mixed again.
Detailed Description
The present invention will be described in further detail with reference to examples.
Table 1 shows the source of the raw materials used in the preparation examples and examples.
Figure BDA0002549103670000051
Figure BDA0002549103670000061
TABLE 1
Preparation example 1
A modified starch ether is prepared by the following steps:
s1: preparing starch emulsion, namely adding water into 1kg of corn starch to prepare the starch emulsion with the weight percentage of 40%;
s2: adding acid: mixing citric acid and succinic acid according to the ratio of 1: 1, and adding the mixture into a starch emulsion, wherein the weight ratio of citric acid to corn starch is 0.1: 1, uniformly stirring to prepare a mixed emulsion;
s3: and (3) moist heat treatment: adding nano silver into the mixed emulsion, wherein the weight of the nano silver is 0.25 percent of that of the corn starch, uniformly stirring, heating the mixed emulsion to 105 ℃, simultaneously pressurizing, controlling the pressure to be 0.13MPa, controlling the heating time to be 2 hours, adding, cooling, separating and drying to obtain pretreated starch;
s4: etherification: preparing the pretreated starch into 25 wt% of emulsion, adding sodium hydroxide into the emulsion to ensure that the pH value of the solution is within 9.5, averagely adding trimethyl (3-chloro-2-hydroxypropyl) ammonium chloride accounting for 1.5 wt% of the modified starch for 3 times, stirring while raising the temperature to 45 ℃, reacting for 6 hours, filtering, separating and drying, preparing the dried substance into 40 wt% of emulsion, adding sodium dodecyl sulfate accounting for 4 wt% of the emulsion, uniformly stirring, performing ultrasonic treatment for 20 minutes, separating and drying to obtain the modified starch ether.
Preparation example 2
A modified starch ether is prepared by the following steps:
s1: preparing starch emulsion, namely adding water into 1kg of corn starch to prepare the starch emulsion with the weight percentage of 30%;
s2: adding acid: mixing citric acid and succinic acid according to a ratio of 1:2, and adding the mixture into a starch emulsion, wherein the weight ratio of the citric acid to the corn starch is 0.25: 1, uniformly stirring to prepare a mixed emulsion;
s3: and (3) moist heat treatment: adding nano silver into the mixed emulsion, wherein the weight of the nano silver is 0.01 percent of that of the corn starch, uniformly stirring, heating the mixed emulsion to 100 ℃, simultaneously pressurizing, controlling the pressure to be 0.10MPa, controlling the heating time to be 1 hour, cooling, separating and drying after adding to obtain pretreated starch;
s4: etherification: preparing the pretreated starch into 20 wt% emulsion, adding sodium hydroxide into the emulsion to enable the pH value of the solution to be 8.2, adding epoxy chloropropane with the weight of 1% of the modified starch in 3 times on average, stirring while adding, raising the temperature to 30 ℃, reacting for 4 hours, filtering, separating, drying, preparing the dried substance into 42 wt% emulsion, adding sodium dodecyl sulfate with the weight of 2% of the emulsion, uniformly stirring, performing ultrasonic treatment for 10 minutes, separating, and drying to obtain the modified starch ether.
Preparation example 3
A modified starch ether is prepared by the following steps:
s1: preparing starch emulsion, namely adding water into 1kg of corn starch to prepare starch emulsion with the weight percentage of 35%;
s2: adding acid: mixing citric acid and succinic acid according to the ratio of 1: 1.5 and adding the mixture into starch emulsion, wherein the weight ratio of citric acid to corn starch is 0.2: 1, uniformly stirring to prepare a mixed emulsion;
s3: and (3) moist heat treatment: adding nano silver into the mixed emulsion, wherein the weight of the nano silver is 0.2 percent of that of the corn starch, uniformly stirring, heating the mixed emulsion to 120 ℃, simultaneously pressurizing, cooling, separating and drying after adding, wherein the pressure is 0.20MPa, and the heating time is 1.5h, so as to obtain pretreated starch;
s4: etherification: preparing the pretreated starch into 22 wt% emulsion, adding sodium hydroxide into the emulsion to ensure that the pH value of the solution is within 8.5, averagely adding trimethyl (3-chloro-2-hydroxypropyl) ammonium chloride accounting for 1.2 wt% of the modified starch for 3 times, stirring while raising the temperature to 40 ℃, reacting for 5 hours, filtering, separating and drying, preparing the dried substance into 45 wt% emulsion, adding sodium dodecyl sulfate accounting for 3 wt% of the emulsion, uniformly stirring, performing ultrasonic treatment for 15 minutes, separating and drying to obtain the modified starch ether.
Example 1
A preparation method of thin-layer plastering mortar comprises the following steps:
the method comprises the following steps: preparing a first mixed material: cellulose, thixotropic agent, starch ether, sodium gluconate, emulsion powder and air entraining agent with the weight shown in the table 2 are mixed uniformly.
Step two: preparing a second mixed material: mixing cement, fly ash and fine sand with the weight shown in the table 2 uniformly;
step three: adding the first mixture into the second mixture for 2 times while stirring at an interval of 1min for 4min, and stirring at 20 deg.C.
Examples 2 to 8
The difference between the preparation method of the thin-layer plastering mortar and the embodiment 1 is that the weight of each substance in the step one and the step two is shown in the table 2.
Example 9
The difference between the preparation method of the thin-layer plastering mortar and the embodiment 8 is that the cellulose is carboxymethyl cellulose.
Examples 10 to 12
The preparation method of the thin-layer plastering mortar is different from the embodiment 8 in that sodium dodecyl sulfate, sodium fatty alcohol-polyoxyethylene ether sulfate and alpha-sodium alkenyl sulfonate are respectively used as an air entraining agent.
Example 13
The preparation method of the thin-layer plastering mortar is different from the embodiment 8 in that in the third step, the first mixed material is added into the second mixed material at one time, stirring is carried out while adding, and stirring is carried out for 3min, wherein the stirring temperature is 60 ℃.
Example 14
A preparation method of thin-layer plastering mortar, which is different from the embodiment 8 in the third step, namely, adding the first mixed material into the second mixed material in three times on average, stirring while adding, wherein the adding interval is 1min, stirring is carried out for 5min totally, and the stirring temperature is 10 ℃.
Comparative example 1
A preparation method of thin-layer plastering mortar comprises the following steps:
the method comprises the following steps: preparing a first mixed material: the thixotropic agent, sodium gluconate, latex powder and the air entraining agent with the weight shown in the table 2 are mixed uniformly.
Step two: preparing a second mixed material: mixing cement, fly ash and fine sand with the weight shown in the table 2 uniformly;
step three: adding the first mixture into the second mixture for 2 times while stirring at an interval of 1min for 4min, and stirring at 20 deg.C.
Comparative example 2
A preparation method of thin-layer plastering mortar comprises the following steps:
the method comprises the following steps: preparing a first mixed material: cellulose, a thixotropic agent, sodium gluconate, emulsion powder and an air entraining agent with the weight shown in the table 2 are uniformly mixed.
Step two: preparing a second mixed material: mixing cement, fly ash and fine sand with the weight shown in the table 2 uniformly;
step three: adding the first mixture into the second mixture for 2 times while stirring at an interval of 1min for 4min, and stirring at 20 deg.C.
Comparative example 3
A preparation method of thin-layer plastering mortar comprises the following steps:
the method comprises the following steps: preparing a first mixed material: the thixotropic agent, the starch ether, the sodium gluconate, the emulsion powder and the air entraining agent with the weight shown in the table 2 are mixed uniformly.
Step two: preparing a second mixed material: mixing cement, fly ash and fine sand with the weight shown in the table 2 uniformly;
step three: adding the first mixture into the second mixture for 2 times while stirring at an interval of 1min for 4min, and stirring at 20 deg.C.
Comparative example 4
The difference between the preparation method of the thin-layer plastering mortar and the embodiment 1 is that the weight of each substance in the step one and the step two is shown in the table 2.
Comparative example 5
The difference between the preparation method of the thin-layer plastering mortar and the embodiment 1 is that the weight of each substance in the step one and the step two is shown in the table 2.
Comparative example 6
A method for preparing a thin-layer plastering mortar, which is different from the method in example 8 in that the stirring temperature in the third step is 5 ℃.
Figure BDA0002549103670000091
TABLE 2
Performance test
1. The thin layer mortars prepared in examples 1 to 14 and comparative examples 1 to 4 were subjected to appearance evaluation according to JC/T890 to 2017 test standards, and the test results are shown in Table 3.
2. The thin-layer mortars prepared in examples 1 to 14 and comparative examples 1 to 4 were tested for 28d compressive strength, 14d tensile bond strength, water retention and 28d shrinkage according to GB/T25181-2010 test standards, and the test results are shown in Table 3.
3. The mortars prepared in examples 1 to 14 and comparative examples 1 to 4 were applied to a wall surface to a thickness of 4mm, and after drying, the surface was observed to be foamed, and the test results are shown in Table 3.
4. The mortars prepared in examples 1 to 14 and comparative example 1 were coated on the wall surface with thin mortar layers of 1mm, 2mm, 3mm, 4mm and 5mm, respectively, and after they were dried, the surface was observed to be foamed, and the test results are shown in table 4.
Figure BDA0002549103670000101
TABLE 3
1mm 2mm 3mm 4mm 5mm
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Example 2 Whether or not Whether or not Whether or not Whether or not Whether or not
Example 3 Whether or not Whether or not Whether or not Whether or not Whether or not
Example 4 Whether or not Whether or not Whether or not Whether or not Whether or not
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Example 7 Whether or not Whether or not Whether or not Whether or not Whether or not
Example 8 Whether or not Whether or not Whether or not Whether or not Whether or not
Example 9 Whether or not Whether or not Whether or not Whether or not Whether or not
Example 10 Whether or not Whether or not Whether or not Whether or not Whether or not
Example 11 Whether or not Whether or not Whether or not Whether or not Whether or not
Example 12 Whether or not Whether or not Whether or not Whether or not Whether or not
Example 13 Whether or not Whether or not Whether or not Whether or not Whether or not
Example 14 Whether or not Whether or not Whether or not Whether or not Whether or not
Comparative example 1 Whether or not Whether or not Whether or not Whether or not Whether or not
Comparative example 2 Is that Is that Is that Is that Is that
Comparative example 3 Whether or not Whether or not Is that Is that Is that
Comparative example 4 Is that Is that Is that Is that Is that
Comparative example 5 Whether or not Whether or not Whether or not Whether or not Whether or not
Comparative example 6 Whether or not Is that Is that Is that Is that
TABLE 4
As can be seen from Table 3, the thin plastering mortars prepared in examples 1 to 14 have good mechanical properties and good adhesion when prepared by the method of example 8. Meanwhile, the foaming phenomenon does not occur when the paint is applied.
Examples 1-3 in comparison with example 8, when the starch ether obtained in preparation example 3 was selected, the thin-layer plastering mortar obtained had better compressive strength and tensile bond strength.
As can be seen from table 3, the compressive strength and the tensile bond strength of comparative example 1 are inferior to those of example 1, which shows that the compressive strength and the tensile bond strength of the thin-layer plastering mortar can be effectively improved by adding starch ether and cellulose. In addition, the plastering mortar prepared in the manner of comparative example 1 had a tensile bond strength of less than 0.3, which did not meet the standard.
As can be seen from table 3, in comparative example 2, in comparison with example 1, since starch ether was not added, the resulting mortar had a high viscosity, and therefore, the air permeability was not sufficient during application, and foaming occurred.
As can be seen from Table 3, in comparative example 3, the tensile bond strength of the mortar obtained without adding cellulose was lowered and was lower than 0.3, which was not the standard, as compared with example 1. In addition, the compressive strength of the mortar is also reduced.
As can be seen from Table 3, comparative examples 4 and 5 show that the weight parts of cellulose are 1 to 2 parts when compared with examples 1 to 8
And the weight part of the starch ether is between 0.2 and 1.6, so that the prepared mortar has better compressive strength and tensile bonding strength.
As can be seen from Table 3, in comparative example 6, when the stirring temperature is too low as compared with example 8, the mortar cannot be uniformly stirred, so that the occurrence of lumps in the mortar occurs, thereby causing foaming when the mortar is applied.
As can be seen from Table 4, the thickness of the coating is generally within 5mm during the general construction process. In examples 1 to 14, no foaming occurred at the application thickness of 1, 2, 3, 4 or 5mm, which indicates that the mortar produced in examples 1 to 14 did not generate foaming at the application thickness of a thick paint.
As can be seen from Table 4, the mortars of comparative examples 2 and 4 foamed when applied at a low thickness, while the mortars of comparative examples 3 and 6 did not foam when applied at a low thickness, but foamed when applied at a high thickness due to gas impermeability.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims (10)

1. The thin-layer plastering mortar is characterized by comprising the following components in parts by weight:
200-250 parts of cement;
45-55 parts of fly ash;
600-650 parts of fine sand;
1-2 parts of cellulose;
0.5-0.8 part of thixotropic agent;
0.1-1.6 parts of starch ether;
1-2 parts of sodium gluconate;
100-120 parts of latex powder;
0.02-0.05 part of air entraining agent;
the weight ratio of the cellulose to the starch ether is 1 (0.1-0.8).
2. The thin-layer plastering mortar of claim 1, wherein the starch ether is a modified starch ether prepared by the following steps:
s1: preparing starch emulsion, namely adding water into corn starch to prepare the starch emulsion with the weight percentage of 30-40%;
s2: adding acid: mixing citric acid and succinic acid according to the proportion of 1 (1-2), and adding the mixture into a starch emulsion, wherein the weight ratio of the citric acid to the corn starch is (0.1-0.25): 1, uniformly stirring to prepare a mixed emulsion;
s3: and (3) moist heat treatment: adding nano silver into the mixed emulsion, wherein the weight of the nano silver is 0.01-0.25% of the weight of the corn starch, uniformly stirring, heating the mixed emulsion to 120 ℃ at the same time, pressurizing at the pressure of 0.10-0.20MPa for 1-2h, adding, cooling, separating and drying to obtain pretreated starch;
s4: etherification: preparing the pretreated starch into 20-25 wt% of emulsion, adding sodium hydroxide into the emulsion to ensure that the pH value of the solution is 8.2-9.5, averagely adding an etherifying agent which accounts for 1-1.5 wt% of the modified starch for 3 times, stirring while raising the temperature to 30-45 ℃, reacting for 4-6h, filtering, separating, drying, preparing the dried substance into 40-45 wt% of emulsion, adding sodium dodecyl sulfate which accounts for 2-4 wt% of the emulsion into the emulsion, uniformly stirring, performing ultrasonic treatment for 10-20min, separating, and drying to obtain the modified starch ether.
3. The thin-layered plastering mortar of claim 2, wherein the pH of the solution is adjusted to 8.5 in step 4.
4. The thin plastering mortar of claim 2, wherein the etherifying agent is trimethyl (3-chloro-2-hydroxypropyl) ammonium chloride in step S4.
5. The thin-layer plastering mortar of any of claims 1 to 4, wherein the cellulose is hydroxypropylmethyl cellulose.
6. The thin-layer plastering mortar of any of claims 1 to 4, wherein the air entraining agent is one of sodium dodecylbenzene sulfonate, sodium dodecyl sulfate, sodium fatty alcohol-polyoxyethylene ether sulfate or sodium alpha-alkenyl sulfonate.
7. The thin-layer plastering mortar of any of claims 1 to 4, wherein the weight ratio of the cellulose to the starch ether is 1: 0.6.
8. the process for the preparation of a thin-layered plastering mortar of any of claims 1 to 7, comprising the steps of:
the method comprises the following steps: preparing a first mixed material: uniformly mixing cellulose, a thixotropic agent, starch ether, sodium gluconate, emulsion powder and an air entraining agent;
step two: preparing a second mixed material: uniformly mixing cement, fly ash and fine sand;
step three: adding the first mixture into the second mixture for 1-3 times, stirring while adding, stirring for 3-5min, and stirring at 10-60 deg.C.
9. The method for preparing thin-layer plastering mortar of claim 8, wherein in the third step, the first mixture is added into the second mixture in 2 times on average, stirring is carried out while adding, the adding interval is 1min, and stirring is carried out for 4 min.
10. The method for preparing a thin-layer plastering mortar of claim 8, wherein the stirring temperature in the third step is 20 ℃.
CN202010569702.7A 2020-06-20 2020-06-20 Thin-layer plastering mortar and preparation method thereof Pending CN111606631A (en)

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