CN117682792A - Dry-mixed mortar additive, preparation method and application - Google Patents
Dry-mixed mortar additive, preparation method and application Download PDFInfo
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- CN117682792A CN117682792A CN202311663583.1A CN202311663583A CN117682792A CN 117682792 A CN117682792 A CN 117682792A CN 202311663583 A CN202311663583 A CN 202311663583A CN 117682792 A CN117682792 A CN 117682792A
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- mixed mortar
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- kaolin
- vinyl acetate
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 86
- 239000000654 additive Substances 0.000 title claims abstract description 55
- 230000000996 additive effect Effects 0.000 title claims abstract description 50
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 239000005995 Aluminium silicate Substances 0.000 claims abstract description 50
- 235000012211 aluminium silicate Nutrition 0.000 claims abstract description 50
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 50
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000005038 ethylene vinyl acetate Substances 0.000 claims abstract description 28
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims abstract description 28
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 22
- 238000002156 mixing Methods 0.000 claims abstract description 19
- 238000001035 drying Methods 0.000 claims abstract description 12
- 238000003756 stirring Methods 0.000 claims abstract description 11
- 238000007873 sieving Methods 0.000 claims abstract description 10
- 239000003607 modifier Substances 0.000 claims abstract description 9
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 6
- 239000010703 silicon Substances 0.000 claims abstract description 6
- 239000000701 coagulant Substances 0.000 claims abstract description 4
- 239000002994 raw material Substances 0.000 claims abstract description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 11
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 9
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 9
- -1 polydimethylsiloxane Polymers 0.000 claims description 9
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 claims description 8
- 229920005646 polycarboxylate Polymers 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 8
- 239000000176 sodium gluconate Substances 0.000 claims description 8
- 229940005574 sodium gluconate Drugs 0.000 claims description 8
- 235000012207 sodium gluconate Nutrition 0.000 claims description 8
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 claims description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 2
- 239000005977 Ethylene Substances 0.000 claims description 2
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims description 2
- 235000015165 citric acid Nutrition 0.000 claims description 2
- 235000012239 silicon dioxide Nutrition 0.000 claims description 2
- 239000002002 slurry Substances 0.000 claims description 2
- 239000011975 tartaric acid Substances 0.000 claims description 2
- 235000002906 tartaric acid Nutrition 0.000 claims description 2
- 238000007334 copolymerization reaction Methods 0.000 claims 1
- 238000010521 absorption reaction Methods 0.000 abstract description 3
- 238000005336 cracking Methods 0.000 abstract description 3
- 239000004566 building material Substances 0.000 abstract description 2
- 230000002195 synergetic effect Effects 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 12
- 239000000463 material Substances 0.000 description 11
- 206010016807 Fluid retention Diseases 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000009472 formulation Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 description 2
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 description 2
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 description 2
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- CHWRSCGUEQEHOH-UHFFFAOYSA-N potassium oxide Chemical compound [O-2].[K+].[K+] CHWRSCGUEQEHOH-UHFFFAOYSA-N 0.000 description 1
- 229910001950 potassium oxide Inorganic materials 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009974 thixotropic effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
The invention belongs to the technical field of building materials, and particularly relates to a dry-mixed mortar additive, a preparation method and application thereof; the dry-mixed mortar additive is prepared from the following raw materials in parts by weight: 90-105 parts of kaolin; 30-40 parts of ethylene-vinyl acetate copolymer; 3-5 parts of water reducer; 1-3 parts of coagulant; 5-10 parts of organic silicon. The preparation method comprises the following steps: s1, drying kaolin, crushing the kaolin by using a ball mill, and sieving for standby; s2, mixing and uniformly stirring the sieved kaolin, the ethylene-vinyl acetate copolymer, the water reducer, the setting modifier and the organosilicon to obtain the dry-mixed mortar additive. The dry-mixed mortar additive provided by the invention contains the ethylene-vinyl acetate copolymer and the organic silicon, and the prepared dry-mixed mortar has excellent water absorption and water retention capacity through the synergistic effect of the ethylene-vinyl acetate copolymer and the organic silicon; and the setting time of the mortar can be obviously shortened, and the cracking of the building can be effectively prevented.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a dry-mixed mortar additive, a preparation method and application thereof.
Background
The building mortar is an essential main material in the building engineering, and comprises two forms of dry-mixed mortar and wet-mixed mortar. The dry-mixed mortar is a mortar which is used more at present, and is a granular or powdery material which is formed by physically mixing aggregate, inorganic cementing material, additives and the like which are subjected to drying and screening treatment according to a certain proportion, is transported to a construction site in a bag or bulk mode, and can be directly used after being mixed with water. However, dry-mixed mortars of the prior art are generally poor in water retention and thixotropic properties; the paint is easy to isolate and bleed, has insufficient workability, is dry and astringent, is not easy to scrape, has low bonding strength, and is easy to generate empty drum and falling off; large shrinkage, easy cracking of the surface and the like.
In order to improve the quality of the dry-mixed mortar, the selection of the dry-mixed mortar additive is particularly important. The dry-mixed mortar additive is a substance added for improving and adjusting mortar properties, and is an industrial product which is added into dry-mixed mortar products in a dry-mixed mortar production factory according to the specification and can improve the normal properties of cement mortar according to the requirements, such as improving workability, waterproofness and strength of the mortar. Common dry-mixed mortar additives include binders, water-retaining agents, setting accelerators and plasticizing water reducers. However, the dry-mixed mortar additives in the prior art have high cost because of the large addition amount required for achieving good use effect, and the conventional dry-mixed mortar additives have poor effect of improving mortar performance.
The Chinese patent with the application number of CN201410526207.2 discloses an additive for dry-mixed mortar, which comprises the following components in percentage by mass: 12-15% of silicon dioxide, 16.5-20% of aluminum oxide, 10.5-14% of calcium oxide, 12-16.5% of magnesium oxide, 8.5-12% of potassium oxide, 15-17.8% of sodium oxide and 12-15.2% of ferric oxide. The additive of the dry-mixed mortar is used in the dry-mixed mortar, so that the step of drying the building aggregate of the dry-mixed mortar is not needed. However, the above additives have the following problems in preparing dry-mixed mortar: the prepared dry-mixed sand has long setting time, and when the dry-mixed sand is used for a building wall surface, the wall surface is cracked due to the fact that the dry-mixed sand cannot be set for a long time.
Therefore, the dry mixed mortar additive which has good comprehensive performance and small additive amount, can effectively prevent wall cracks and hollows, has obvious improvement effects on the operation handfeel, water retention, cohesiveness with a base layer, coordination deformation performance and the like of the mortar, meets the market demand, and has higher market value and social value.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a dry-mixed mortar additive, a preparation method and application.
The aim of the invention can be achieved by the following technical scheme:
the dry-mixed mortar additive comprises the following preparation raw materials in parts by weight:
preferably, the kaolin has a total active alumina and active silica content of 95-100%.
Preferably, the ethylene-vinyl acetate copolymer is obtained by copolymerizing ethylene and vinyl acetate, and the content of vinyl acetate in the ethylene-vinyl acetate copolymer is 25-30%.
Preferably, the silicone is polydimethylsiloxane.
Preferably, the water reducer is a powder polycarboxylate water reducer.
Preferably, the coagulant is one or more of tartaric acid, citric acid and sodium gluconate.
Preferably, a preparation method of the dry-mixed mortar additive comprises the following steps:
s1, drying kaolin, crushing the kaolin by using a ball mill, and sieving for standby;
s2, mixing the sieved kaolin, the ethylene-vinyl acetate copolymer, the water reducer, the setting modifier and the organosilicon according to corresponding parts by weight, and uniformly stirring to obtain the dry-mixed mortar additive.
Preferably, in step S1, the mixture is sieved through a 400-500 mesh sieve.
Preferably, in step S2, the stirring and mixing time is 2-6 hours.
Preferably, the dry-mixed mortar additive is applied to the preparation of mortar slurry.
1. The preparation method of the dry-mixed mortar additive provided by the invention is simple and feasible, can simplify the production formula and the production flow, reduces the quality control links, is easier to disperse during addition, and is suitable for large-scale production.
2. The dry-mixed mortar additive provided by the invention contains a kaolin component, wherein the total content of active alumina and active silica in kaolin in the kaolin component is 95-100%; the addition of the kaolin obviously improves the bonding strength of the prepared dry-mixed mortar.
3. The dry-mixed mortar additive provided by the invention contains the ethylene-vinyl acetate copolymer and the organic silicon, and the prepared dry-mixed mortar has excellent water absorption and water retention capacity through the synergistic effect of the ethylene-vinyl acetate copolymer and the organic silicon; and the setting time of the mortar can be obviously shortened, and the cracking of the building can be effectively prevented.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the prior art, the drawings that are required for the description of the embodiments or the prior art will be briefly described, and it will be apparent to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a flow chart of the preparation of the dry-mixed mortar additive according to the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
90 parts of kaolin, 30 parts of ethylene-vinyl acetate copolymer, 4 parts of powder polycarboxylate water reducer, 2 parts of sodium gluconate and 5 parts of polydimethylsiloxane are weighed respectively, and each part is 10g.
Preparation of dry-mixed mortar additive
S1, drying kaolin, crushing the kaolin by using a ball mill, and sieving the crushed kaolin with a 500-mesh sieve for later use;
s2, adding the sieved kaolin, the ethylene-vinyl acetate copolymer, the water reducer, the setting modifier and the organosilicon into a stirrer according to corresponding parts by weight, mixing and stirring for 4 hours, and uniformly mixing various materials to obtain the dry-mixed mortar additive.
Example 2
105 parts of kaolin, 30 parts of ethylene-vinyl acetate copolymer, 4 parts of powder polycarboxylate water reducer, 2 parts of sodium gluconate and 5 parts of polydimethylsiloxane are weighed respectively, and each part is 10g.
Preparation of dry-mixed mortar additive
S1, drying kaolin, crushing the kaolin by using a ball mill, and sieving the crushed kaolin with a 500-mesh sieve for later use;
s2, adding the sieved kaolin, the ethylene-vinyl acetate copolymer, the water reducer, the setting modifier and the organosilicon into a stirrer according to corresponding parts by weight, mixing and stirring for 4 hours, and uniformly mixing various materials to obtain the dry-mixed mortar additive.
Example 3
90 parts of kaolin, 40 parts of ethylene-vinyl acetate copolymer, 4 parts of powder polycarboxylate water reducer, 2 parts of sodium gluconate and 5 parts of polydimethylsiloxane are weighed respectively, and each part is 10g.
Preparation of dry-mixed mortar additive
S1, drying kaolin, crushing the kaolin by using a ball mill, and sieving the crushed kaolin with a 500-mesh sieve for later use;
s2, adding the sieved kaolin, the ethylene-vinyl acetate copolymer, the water reducer, the setting modifier and the organosilicon into a stirrer according to corresponding parts by weight, mixing and stirring for 4 hours, and uniformly mixing various materials to obtain the dry-mixed mortar additive.
Example 4
105 parts of kaolin, 40 parts of ethylene-vinyl acetate copolymer, 4 parts of powder polycarboxylate water reducer, 2 parts of sodium gluconate and 5 parts of polydimethylsiloxane are weighed respectively, and each part is 10g.
Preparation of dry-mixed mortar additive
S1, drying kaolin, crushing the kaolin by using a ball mill, and sieving the crushed kaolin with a 500-mesh sieve for later use;
s2, adding the sieved kaolin, the ethylene-vinyl acetate copolymer, the water reducer, the setting modifier and the organosilicon into a stirrer according to corresponding parts by weight, mixing and stirring for 4 hours, and uniformly mixing various materials to obtain the dry-mixed mortar additive.
Example 5
90 parts of kaolin, 40 parts of ethylene-vinyl acetate copolymer, 4 parts of powder polycarboxylate water reducer, 2 parts of sodium gluconate and 10 parts of polydimethylsiloxane are weighed respectively, and each part is 10g.
Preparation of dry-mixed mortar additive
S1, drying kaolin, crushing the kaolin by using a ball mill, and sieving the crushed kaolin with a 500-mesh sieve for later use;
s2, adding the sieved kaolin, the ethylene-vinyl acetate copolymer, the water reducer, the setting modifier and the organosilicon into a stirrer according to corresponding parts by weight, mixing and stirring for 4 hours, and uniformly mixing various materials to obtain the dry-mixed mortar additive.
Example 6
105 parts of kaolin, 40 parts of ethylene-vinyl acetate copolymer, 4 parts of powder polycarboxylate water reducer, 2 parts of sodium gluconate and 10 parts of polydimethylsiloxane are respectively weighed, and each part is 10g.
Preparation of dry-mixed mortar additive
S1, drying kaolin, crushing the kaolin by using a ball mill, and sieving the crushed kaolin with a 500-mesh sieve for later use;
s2, adding the sieved kaolin, the ethylene-vinyl acetate copolymer, the water reducer, the setting modifier and the organosilicon into a stirrer according to corresponding parts by weight, mixing and stirring for 4 hours, and uniformly mixing various materials to obtain the dry-mixed mortar additive.
Comparative example 1
The formulation of comparative example 1 was substantially the same as that of example 1, except that kaolin was absent from comparative example 1, and the preparation method of dry-mixed mortar additive was also the same as that of example 1.
Comparative example 2
The formulation of comparative example 2 was substantially the same as that of example 1, except that the ethylene-vinyl acetate copolymer was absent in comparative example 2, and the preparation method of the dry-mixed mortar additive was also the same as that of example 1.
Comparative example 3
The formulation in comparative example 3 is substantially the same as in example 1, except that polydimethylsiloxane is absent in comparative example 2 and the preparation method for preparing the dry-mixed mortar additive is also the same as in example 1.
And (3) testing:
200 parts of Portland cement with the strength grade of 42.5R, 842 parts of building aggregate, 0.3 part of hydroxypropyl methyl cellulose and 8 parts of dry-mixed mortar additive prepared in examples 1-6 and comparative examples 1-3 are weighed according to parts by weight. Wherein the building aggregate is waste red brick, and the length of the building aggregate is 1 mm; and mixing the silicate cement, the building aggregate, the hydroxypropyl methylcellulose and the additive to obtain the dry-mixed mortar.
The dry-mixed mortar obtained in each example was tested for water content, caking condition, compressive strength, water retention and setting time.
And (3) water content testing: the testing method comprises the following steps: firstly, weighing the prepared dry-mixed mortar to obtain X0, then drying the dry-mixed mortar at 100 ℃ for 3 hours, then weighing the dried dry-mixed mortar for X1, and then obtaining the dry-mixed mortar according to the water content= (X0-X1)/X0 multiplied by 100 percent.
Agglomeration phenomenon: and (3) observing the caking phenomenon of the dry-mixed mortar after the dry-mixed mortar is placed for 3 months in a dry environment.
Compressive strength test: the dry-mixed mortar prepared in each example was mixed with water at a mass ratio of 1:0.19, and the compressive strength after 28 days was tested according to GB/T25181-2010 using a compression tester model JC 079J.
The test results are shown in Table 1.
As can be seen from the combination of the water content data and caking conditions in examples 1 to 6 and comparative examples 1 to 3 in table 1, the dry-mixed mortars of examples 1 to 6 were not caking even after being left for 3 months, although the water content was high. The dry-mixed mortar additive added with kaolin, ethylene-vinyl acetate copolymer and organosilicon has good water absorption.
It can be seen from the combination of the compressive strength, the water content data and the setting time in examples 1 to 6 and comparative examples 1 to 3 in table 1 that the dry-mixed mortar additive, to which kaolin, ethylene-vinyl acetate copolymer and silicone are added at the same time, can significantly improve the compressive strength, the water retention of the dry-mixed mortar and can shorten the setting time of the dry-mixed mortar.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.
Claims (10)
1. The dry-mixed mortar additive is characterized by comprising the following preparation raw materials in parts by weight:
90-105 parts of kaolin;
30-40 parts of ethylene-vinyl acetate copolymer;
3-5 parts of water reducer;
1-3 parts of coagulant;
5-10 parts of organic silicon.
2. A dry-mixed mortar additive according to claim 1, characterized in that: the total content of active alumina and active silicon dioxide in the kaolin is 95-100%.
3. A dry-mixed mortar additive according to claim 1, characterized in that: the ethylene-vinyl acetate copolymer is obtained by copolymerization of ethylene and vinyl acetate, and the content of vinyl acetate in the ethylene-vinyl acetate copolymer is 25-30%.
4. A dry-mixed mortar additive according to claim 1, characterized in that: the organosilicon is polydimethylsiloxane.
5. A dry-mixed mortar additive according to claim 1, characterized in that: the water reducer is a powder polycarboxylate water reducer.
6. A dry-mixed mortar additive according to claim 1, characterized in that: the coagulant is one or more of tartaric acid, citric acid and sodium gluconate.
7. The preparation method of the dry-mixed mortar additive is characterized by comprising the following steps of:
s1, drying kaolin, crushing the kaolin by using a ball mill, and sieving for standby;
s2, mixing the sieved kaolin, the ethylene-vinyl acetate copolymer, the water reducer, the setting modifier and the organosilicon according to corresponding parts by weight, and uniformly stirring to obtain the dry-mixed mortar additive.
8. The method of manufacturing according to claim 7, wherein: in the step S1, the mixture is sieved by a 400-500 mesh sieve during sieving.
9. The method of manufacturing according to claim 7, wherein: in the step S2, stirring and mixing time is 2-6h.
10. Use of a dry-mixed mortar additive according to any of claims 1-6 for the preparation of mortar slurry.
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| CN202311663583.1A CN117682792A (en) | 2023-12-06 | 2023-12-06 | Dry-mixed mortar additive, preparation method and application |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311663583.1A CN117682792A (en) | 2023-12-06 | 2023-12-06 | Dry-mixed mortar additive, preparation method and application |
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