CN111548078A - Cement mortar and preparation method thereof - Google Patents
Cement mortar and preparation method thereof Download PDFInfo
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- CN111548078A CN111548078A CN202010600399.2A CN202010600399A CN111548078A CN 111548078 A CN111548078 A CN 111548078A CN 202010600399 A CN202010600399 A CN 202010600399A CN 111548078 A CN111548078 A CN 111548078A
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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
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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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
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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
- C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
- C04B22/08—Acids or salts thereof
- C04B22/12—Acids or salts thereof containing halogen in the anion
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/12—Nitrogen containing compounds organic derivatives of hydrazine
- C04B24/124—Amides
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2664—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of ethylenically unsaturated dicarboxylic acid polymers, e.g. maleic anhydride copolymers
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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)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses cement mortar and a preparation method thereof, wherein the method comprises the following steps: s1: putting the graphene oxide into water to perform wave dispersion to obtain a dispersion liquid; s2: under the condition of stirring, adding basalt fibers into the dispersion liquid, and continuously stirring and mixing the basalt fibers and the dispersion liquid under the condition of keeping the rotating speed unchanged to obtain a mixed solution of graphene oxide and the basalt fibers; s3: carrying out heat treatment on the mixed solution of the graphene oxide and the basalt fiber to obtain graphene basalt fiber; s4: adding the graphene basalt fibers prepared in the step S3 into a stirring pot, and then adding the following materials: sand, cement, a polycarboxylic acid water reducing agent, potassium aluminosilicate, an anisene-maleic anhydride copolymer, lysine calcium phosphate and chromium trichloride hexahydrate, and then heating and stirring to obtain cement mortar. The compressive strength and the flexural strength of the mortar test piece prepared by the cement mortar are obviously superior to those of the mortar test piece prepared by the prior art.
Description
Technical Field
The invention belongs to the technical field of building material preparation, and particularly relates to cement mortar and a preparation method thereof.
Background
With the rapid development of electronic communication technology, a large amount of miniaturized and integrated electronic instruments and meters enter homes, and the electromagnetic radiation problem caused by the miniaturized and integrated electronic instruments and meters is also receiving increasing attention. On one hand, electromagnetic radiation can interfere with nearby electronic equipment to influence the normal operation of the electronic equipment, and the electromagnetic radiation can also leak information, so that instruments such as a computer have no information safety guarantee. On the other hand, electromagnetic radiation can also cause damage to human bodies, and in severe cases, neurological disorder, behavior runaway and the like of people can be caused. Therefore, electromagnetic radiation has become a new pollution source and is listed as the third public nuisance in the world by the world health organization.
The construction of a functional layer with electromagnetic wave shielding or absorption on a building wall is a common method for shielding electromagnetic waves. At present, the research on electromagnetic shielding materials mainly focuses on the aspects of fibers, conductive polymers, composite materials and the like, and most of finished products are coated on the surface layers of electronic instruments, buildings and the like in the form of coatings to form electromagnetic shielding layers so as to achieve the purpose of electromagnetic shielding. However, the coating is relatively high in requirement (thin and light), poor in weather resistance and easy to peel off, and has great limitation in the practical application process. In order to obtain an obvious electromagnetic shielding effect, the addition amount of the metal powder or the carbon fiber is generally more than 10 wt%. The addition of a large amount of metal powder or carbon fibers not only greatly increases the cost of the concrete material, but also causes the performance of the concrete material to be reduced.
The Chinese patent application document 'cement mortar and a preparation method thereof (application publication No. CN 108947376A)' discloses cement mortar and a preparation method thereof, wherein the cement mortar is prepared from the following raw materials in parts by mass: 1-5 parts of graphene oxide, 1-10 parts of basalt fiber, 30-50 parts of water, 300 parts of sand 250-containing cement, 100 parts of cement and 1-5 parts of an additive. According to the invention, the shielding performance of cement mortar to electromagnetic radiation is effectively improved by coating basalt fibers with graphene, but the problems of insufficient compressive and flexural strength and incapability of meeting application requirements exist.
Disclosure of Invention
The invention provides a preparation method of cement mortar, and aims to solve the problems that a mortar test piece prepared by the prior art is not high enough in compression strength and bending strength and cannot meet application requirements.
In order to solve the technical problems, the invention adopts the following technical scheme:
a preparation method of cement mortar comprises the following steps:
s1, putting 6-8 parts by weight of graphene oxide into 80-120 parts by weight of water for ultrasonic dispersion to obtain a graphene oxide dispersion liquid;
s2: under the condition that the stirring rotation speed is 200-300r/min, adding 13-17 parts by weight of basalt fiber into the graphene oxide dispersion liquid prepared in the step S1, and continuously stirring and mixing for 8-12 hours while keeping the rotation speed unchanged to obtain a mixed solution of the graphene oxide and the basalt fiber;
s3: carrying out heat treatment on the mixed solution of the graphene oxide and the basalt fiber prepared in the step S2 to obtain graphene basalt fiber;
s4: adding the graphene basalt fibers prepared in the step S3 into a stirring pot, and then adding the following materials: the cement mortar is prepared by heating and stirring the sand, the cement, a polycarboxylic acid water reducing agent, potassium aluminosilicate, an anisene-maleic anhydride copolymer, lysine calcium phosphate and chromium trichloride hexahydrate, wherein the weight ratio of the potassium aluminosilicate to the anisene-maleic anhydride copolymer to the lysine calcium phosphate to the chromium trichloride hexahydrate is (7-12) to (2-4) to (18-26) to (3-6).
Further, in step S1, the graphene oxide has a sheet diameter of 0.2 to 8.1 μm, an oxygen content of 12 to 48%, and 2 to 7 layers.
Further, the conditions of the ultrasonic dispersion in step S1 are as follows: the ultrasonic power is 800-.
Further, the basalt fiber in the step S2 is added to the graphene oxide dispersion liquid prepared in the step S1 at 3 to 5 min.
Further, the conditions of the heat treatment in step S3: heat treatment is carried out for 3-5h at the temperature of 102-114 ℃.
Further, the material in the step S4 comprises the following raw materials in parts by weight: 400-480 parts of sand, 150-220 parts of cement, 2-6 parts of a polycarboxylic acid water reducing agent, 7-12 parts of potassium aluminosilicate, 2-4 parts of an anisene-maleic anhydride copolymer, 18-26 parts of calcium phosphate lysine and 3-6 parts of chromium trichloride hexahydrate.
Further, the preparation method of the anisene-maleic anhydride copolymer comprises the following steps: under the protection of nitrogen, the anisene and the maleic anhydride are dissolved in cyclohexanone, and the dilauryl peroxide is added for reaction to prepare the anisene-maleic anhydride copolymer.
Further, the added amount of the dilauroyl peroxide material is 8.6% of the total amount of the anisidine and maleic anhydride material.
Further, the conditions of stirring in step S4 are as follows: stirring at the speed of 200-300r/min for 1-2 h.
The invention has the following beneficial effects:
on the basis of the prior art, by analyzing the defects of the prior art and through multiple innovative researches on component formula, dosage and the like, potassium aluminosilicate, an anisene-maleic anhydride copolymer, calcium lysine phosphate and chromium trichloride hexahydrate with synergistic effect are selectively added into raw materials for preparing the cement mortar, so that the compressive strength and the flexural strength of a mortar test piece prepared from the cement mortar are respectively improved by 134.85% and 142.52%, the actual technical problem that the compressive strength and the flexural strength of the mortar test piece prepared from the prior art are not high enough and cannot meet application requirements is effectively solved, and the method has obvious progress.
Detailed Description
Example 1
A preparation method of cement mortar comprises the following steps:
s1: putting 6 parts by weight of graphene oxide into 82 parts by weight of water for ultrasonic dispersion, wherein the sheet diameter of the graphene oxide is 0.2-8.1 mu m, the oxygen content is 12-48%, the number of layers is 2-7, the ultrasonic power is 800W, the frequency is 300KHz, and the ultrasonic dispersion time is 20min to obtain a graphene oxide dispersion liquid;
s2: under the condition that the stirring rotation speed is 300r/min, adding 14 parts by weight of basalt fibers into the graphene oxide dispersion liquid prepared in the step S1 for 3min, and continuously stirring and mixing for 10h while keeping the rotation speed unchanged to obtain a mixed solution of graphene oxide and basalt fibers;
s3: carrying out heat treatment on the mixed solution of the graphene oxide and the basalt fiber prepared in the step S2 at 109 ℃ for 4h to obtain graphene basalt fiber;
s4: adding the graphene basalt fiber prepared in the step S3 into a stirring pot, and then adding the following materials in parts by weight: 406 parts of sand, 153 parts of cement, 5 parts of a polycarboxylic acid water reducing agent, 11 parts of potassium aluminosilicate, 2 parts of an anisidine-maleic anhydride copolymer, 20 parts of calcium lysine phosphate and 3 parts of chromium trichloride hexahydrate, heating to 86 ℃, and stirring at the speed of 200r/min for 2 hours to prepare cement mortar;
the preparation method of the anisylene-maleic anhydride copolymer comprises the following steps: under the protection of nitrogen, the anisene and the maleic anhydride are dissolved in cyclohexanone according to the material mass ratio of 1: 1, and dilauroyl peroxide with the mass amount of 8.6 percent of the total mass amount of the anisene and the maleic anhydride is added, and then the mixture reacts for 2 hours under the condition of 158 ℃ to prepare the anisene-maleic anhydride copolymer.
Example 2
A preparation method of cement mortar comprises the following steps:
s1: putting 7 parts by weight of graphene oxide into 104 parts by weight of water for ultrasonic dispersion, wherein the sheet diameter of the graphene oxide is 0.2-8.1 mu m, the oxygen content is 12-48%, the number of layers is 2-7, the ultrasonic power is 1000W, the frequency is 400KHz, and the ultrasonic dispersion time is 12min to obtain a graphene oxide dispersion liquid;
s2: under the condition that the stirring rotation speed is 300r/min, adding 15 parts by weight of basalt fibers into the graphene oxide dispersion liquid prepared in the step S1 for 4min, and continuously stirring and mixing for 12h while keeping the rotation speed unchanged to obtain a mixed solution of graphene oxide and basalt fibers;
s3: carrying out heat treatment on the mixed solution of the graphene oxide and the basalt fiber prepared in the step S2 at 110 ℃ for 4h to obtain graphene basalt fiber;
s4: adding the graphene basalt fiber prepared in the step S3 into a stirring pot, and then adding the following materials in parts by weight: 460 parts of sand, 200 parts of cement, 4 parts of a polycarboxylic acid water reducing agent, 10 parts of potassium aluminosilicate, 3 parts of an anisidine-maleic anhydride copolymer, 24 parts of calcium lysine phosphate and 5 parts of chromium trichloride hexahydrate, heating to 93 ℃, and stirring at the speed of 300r/min for 1h to prepare cement mortar;
the preparation method of the anisylene-maleic anhydride copolymer comprises the following steps: under the protection of nitrogen, the anisene and the maleic anhydride are dissolved in cyclohexanone according to the material mass ratio of 1: 1, and dilauroyl peroxide with the mass amount of 8.6 percent of the total mass amount of the anisene and the maleic anhydride is added, and then the mixture reacts for 2 hours under the condition of 158 ℃ to prepare the anisene-maleic anhydride copolymer.
Example 3
A preparation method of cement mortar comprises the following steps:
s1: putting 8 parts by weight of graphene oxide into 120 parts by weight of water for ultrasonic dispersion, wherein the sheet diameter of the graphene oxide is 0.2-8.1 mu m, the oxygen content is 12-48%, the number of layers is 2-7, the ultrasonic power is 900W, the frequency is 400KHz, and the ultrasonic dispersion time is 18min, so as to obtain a graphene oxide dispersion liquid;
s2: under the condition that the stirring rotation speed is 300r/min, adding 17 parts by weight of basalt fibers into the graphene oxide dispersion liquid prepared in the step S1 for 3min, and continuously stirring and mixing for 9h while keeping the rotation speed unchanged to obtain a mixed solution of graphene oxide and basalt fibers;
s3: carrying out heat treatment on the mixed solution of the graphene oxide and the basalt fiber prepared in the step S2 at 112 ℃ for 4h to obtain graphene basalt fiber;
s4: adding the graphene basalt fiber prepared in the step S3 into a stirring pot, and then adding the following materials in parts by weight: 480 parts of sand, 204 parts of cement, 5 parts of a polycarboxylic acid water reducing agent, 12 parts of potassium aluminosilicate, 4 parts of an anisylene-maleic anhydride copolymer, 23 parts of lysine calcium phosphate and 6 parts of chromium trichloride hexahydrate, heating to 88 ℃, and stirring at the speed of 300r/min for 1.5 hours to prepare cement mortar;
the preparation method of the anisylene-maleic anhydride copolymer comprises the following steps: under the protection of nitrogen, the anisene and the maleic anhydride are dissolved in cyclohexanone according to the material mass ratio of 1: 1, and dilauroyl peroxide with the mass amount of 8.6 percent of the total mass amount of the anisene and the maleic anhydride is added, and then the mixture reacts for 2 hours under the condition of 158 ℃ to prepare the anisene-maleic anhydride copolymer.
Comparative example 1
The cement mortar preparation method of example 2 was substantially the same except that the raw materials in step S4 were devoid of potassium aluminosilicate, an anisene-maleic anhydride copolymer, calcium lysine phosphate, chromium trichloride hexahydrate.
Comparative example 2
The cement mortar preparation method of example 2 was substantially the same except that the raw material in step S4 lacked potassium aluminosilicate.
Comparative example 3
The cement mortar of example 2 was prepared in substantially the same manner except that the material in step S4 lacks the anisidine-maleic anhydride copolymer.
Comparative example 4
The cement mortar preparation method of example 2 was substantially the same except that the raw material in step S4 lacked lysine calcium phosphate.
Comparative example 5
Basically the same procedure as that for the cement mortar preparation of example 2, except that the raw material in step S4 lacks chromium trichloride hexahydrate.
Comparative example 6
The cement mortar was prepared by the method of example 1-4 in "a cement mortar and its preparation method (application publication No. CN 108947376A)" of the Chinese invention patent application.
Comparative example 7
The cement mortar preparation method is substantially the same as that of example 2 except that 20 parts of potassium aluminosilicate, 9 parts of an anisene-maleic anhydride copolymer, 7 parts of calcium phosphate lysinate and 1 part of chromium trichloride hexahydrate are contained in the raw materials in step S4.
Comparative example 8
The cement mortar preparation method is substantially the same as that of example 2 except that 16 parts of potassium aluminosilicate, 1 part of an anisene-maleic anhydride copolymer, 29 parts of calcium phosphate lysine, and 7 parts of chromium trichloride hexahydrate are contained in the raw material in step S4.
Comparative example 9
The cement mortar preparation method is substantially the same as that of example 2 except that 3 parts of potassium aluminosilicate, 1 part of an anisene-maleic anhydride copolymer, 32 parts of calcium phosphate lysinate and 9 parts of chromium trichloride hexahydrate are contained in the raw materials in step S4.
The mechanical properties of the cement mortars prepared in examples 1 to 3 of the present invention and comparative examples 1 to 9 were tested. The test method is as follows:
mechanical property test A mortar test piece with the test piece size of 40mm multiplied by 160mm is formed according to a GB/T17671-1999 cement mortar strength test method, the mortar test piece is maintained in a temperature maintenance box for 24 hours, then the mortar test piece is demoulded, and then the mortar test piece is maintained in water to a specified age for mechanical property test, and the results are shown in the following table:
from the above table, it can be seen that: (1) as can be seen from the data of example 2 and comparative examples 1-5, potassium aluminosilicate, anisene-maleic anhydride copolymer, calcium lysine phosphate, chromium trichloride hexahydrate play a synergistic role in preparing cement mortar, and the compressive strength and the flexural strength of a mortar test piece are synergistically improved, which is that:
the potassium aluminosilicate has high alkali content and strong water absorption, and can be used as a supplement of a polycarboxylate water reducing agent, a plurality of branched chains existing in molecules of the polycarboxylate water reducing agent can provide steric hindrance effect, and in a high-alkalinity environment provided by the potassium aluminosilicate, the branched chains can be slowly cut off, so that polycarboxylic acid with a dispersing effect is released, the dispersing effect of cement particles can be improved, slump loss can be controlled, and the compressive strength and the breaking strength of a mortar test piece can be improved. Under the action of rich positive charges on the surface of potassium aluminosilicate, chromium trichloride hexahydrate is hydrolyzed on the surface of the potassium aluminosilicate to realize flocculation, so that water molecules are enriched, and the self flocculation process in cement mortar is further destroyed; under the nucleation effect of lysine calcium phosphate, the crystallization behavior of cement mortar is changed, the crystallization rate of the cement mortar surrounding potassium aluminosilicate is further accelerated, the crystallization density is increased, and the grain size is promoted to be micronized, so that the crosslinking capability of potassium aluminosilicate in the cement mortar is improved, and the compressive strength and the flexural strength of a cement mortar test piece are further enhanced. The anisidine-maleic anhydride copolymer can be directionally adsorbed on the surface of cement particles, so that positive charges are carried on the surface of the cement particles, an electrostatic repulsion effect is formed, lysine calcium phosphate and potassium aluminosilicate are promoted to be mutually dispersed, a flocculation structure is prevented from being generated, the lysine calcium phosphate and the potassium aluminosilicate respectively play a role, and the compression strength and the breaking strength of a cement mortar test piece are further promoted to be improved.
(2) As can be seen from the comparison of the data in examples 1-3, example 2 is the most preferred example, i.e., the process is the most preferred method of preparation; as can be seen from the data of examples 1-3 and comparative example 6, the compressive strength and the flexural strength of the mortar test piece prepared by using the cement mortar of the invention are respectively improved by at least 134.85% and 142.52%, thus the invention is obviously superior to the compressive strength and the flexural strength of the mortar test piece prepared by the prior art, and the problems that the compressive strength and the flexural strength of the mortar test piece prepared by the prior art are not high enough and cannot meet the application requirements are solved.
(3) As can be seen from the data of comparative examples 7 to 9, when the weight ratio of potassium aluminosilicate, the anisene-maleic anhydride copolymer, the calcium lysine phosphate and the chromium trichloride hexahydrate is not in the range of (7-12): (2-4): (18-26): 3-6), the compressive strength and the flexural strength of the cement mortar test pieces obtained were significantly different from those of examples 1 to 3, and were much smaller than those of examples 1 to 3 by at least 11.34% and 11.59% or more, respectively. The invention relates to a reinforcing system for improving compressive strength and breaking strength of potassium aluminosilicate, an anisene-maleic anhydride copolymer, calcium lysine phosphate and chromium trichloride hexahydrate as a whole, wherein in the embodiment 1-3, when cement mortar is prepared by controlling the weight ratio of the potassium aluminosilicate, the anisene-maleic anhydride copolymer, the calcium lysine phosphate and the chromium trichloride hexahydrate to be (7-12) to (2-4) to (18-26) to (3-6), the flocculation of the chromium trichloride hexahydrate on the surface is realized by utilizing the abundant positive charge action on the surface of the potassium aluminosilicate in the reinforcing system, the chromium hydroxide generated by the reaction of the chromium trichloride hexahydrate and water under heating can be dissolved in acidic water to play a role of adsorption and bridging, and the crystallization and nucleation capability of the cement mortar around the potassium aluminosilicate is accelerated, under the nucleation effect of calcium lysine phosphate, the crosslinking capacity of potassium aluminosilicate in cement mortar is improved, the anisylene-maleic anhydride copolymer can promote the mutual dispersion of the calcium lysine phosphate and the potassium aluminosilicate and promote the respective functions of the calcium lysine phosphate and the potassium aluminosilicate, and a reinforcing system consisting of the potassium aluminosilicate, the anisylene-maleic anhydride copolymer, the calcium lysine phosphate and the chromium trichloride hexahydrate in the weight ratio of (7-12) to (2-4) to (18-26) to (3-6) is controlled, so that the compressive strength and the flexural strength of a cement mortar test piece are synergistically improved in the preparation of the cement mortar.
The cement mortar prepared in the most preferred embodiment 2 of the present invention was subjected to the test of the electromagnetic shielding property. The test method is as follows:
electromagnetic shielding performance testing was performed according to the method specified in military standard SJ20524-1995 in the electronics industry. The test piece is a round cake-shaped test piece with the diameter of 115mm, the central aperture of 12mm and the thickness of 8 mm. And (3) curing the sample in a standard curing box for 1 day, demolding, continuously curing in the curing box for 14 days, airing and drying in a drying box at 60 ℃ for 2 hours, and cooling to room temperature.
The results are as follows: the highest shielding effectiveness of the cement mortar prepared in example 2 was 20.4dB, which is equivalent to the highest shielding effectiveness level of the cement mortar prepared in comparative example 6 (prior art), indicating that the added potassium aluminosilicate, anisene-maleic anhydride copolymer, calcium lysine phosphate, chromium trichloride hexahydrate of the present invention have little effect on the electromagnetic shielding performance, but have an effect on the compressive strength and the flexural strength.
The foregoing is a more detailed description of the invention in connection with specific/preferred embodiments and is not intended to limit the practice of the invention to those descriptions. It will be apparent to those skilled in the art that various substitutions and modifications can be made to the described embodiments without departing from the spirit of the invention, and such substitutions and modifications are to be considered as within the scope of the invention.
Claims (10)
1. The preparation method of cement mortar is characterized by comprising the following steps:
s1: putting 6-8 parts by weight of graphene oxide into 80-120 parts by weight of water for ultrasonic dispersion to obtain a graphene oxide dispersion liquid;
s2: under the condition that the stirring rotation speed is 200-300r/min, adding 13-17 parts by weight of basalt fiber into the graphene oxide dispersion liquid prepared in the step S1, and continuously stirring and mixing for 8-12 hours while keeping the rotation speed unchanged to obtain a mixed solution of the graphene oxide and the basalt fiber;
s3: carrying out heat treatment on the mixed solution of the graphene oxide and the basalt fiber prepared in the step S2 to obtain graphene basalt fiber;
s4: adding the graphene basalt fibers prepared in the step S3 into a stirring pot, and then adding the following materials: the cement mortar is prepared by heating and stirring the sand, the cement, a polycarboxylic acid water reducing agent, potassium aluminosilicate, an anisene-maleic anhydride copolymer, lysine calcium phosphate and chromium trichloride hexahydrate, wherein the weight ratio of the potassium aluminosilicate to the anisene-maleic anhydride copolymer to the lysine calcium phosphate to the chromium trichloride hexahydrate is (7-12) to (2-4) to (18-26) to (3-6).
2. The method for preparing cement mortar according to claim 1, wherein the graphene oxide in step S1 has a sheet diameter of 0.2 to 8.1 μm, an oxygen content of 12 to 48%, and 2 to 7 layers.
3. The method for preparing cement mortar according to claim 1, wherein the ultrasonic dispersion conditions in step S1 are as follows: the ultrasonic power is 800-.
4. The method for preparing cement mortar according to claim 1, wherein basalt fiber is added to the graphene oxide dispersion liquid prepared in step S1 within 3-5min in step S2.
5. The method for preparing cement mortar according to claim 1, wherein the conditions of the heat treatment in step S3 are: heat treatment is carried out for 3-5h at the temperature of 102-114 ℃.
6. The preparation method of cement mortar according to claim 1, wherein the materials in step S4 comprise the following raw materials in parts by weight: 400-480 parts of sand, 150-220 parts of cement, 2-6 parts of a polycarboxylic acid water reducing agent, 7-12 parts of potassium aluminosilicate, 2-4 parts of an anisene-maleic anhydride copolymer, 18-26 parts of calcium phosphate lysine and 3-6 parts of chromium trichloride hexahydrate.
7. The process for preparing cement mortar according to claim 1 or 6, wherein the process for preparing the anisene-maleic anhydride copolymer comprises the steps of: under the protection of nitrogen, the anisene and the maleic anhydride are dissolved in cyclohexanone, and the dilauryl peroxide is added for reaction to prepare the anisene-maleic anhydride copolymer.
8. The process for preparing cement mortar according to claim 7, wherein the amount of the dilauroyl peroxide additive is 8.6% of the total amount of the anisidine and maleic anhydride.
9. The method for preparing cement mortar according to claim 1, wherein the stirring conditions in step S4 are as follows: stirring at the speed of 200-300r/min for 1-2 h.
10. A cementitious mortar prepared according to the method of any one of claims 1 to 9.
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| CN108947376A (en) * | 2018-08-16 | 2018-12-07 | 北京天维宝辰化学产品有限公司 | A kind of cement mortar and preparation method thereof |
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Application publication date: 20200818 |