CN111777717A - Core-shell structure polymer cement modifier, preparation method and cement-based material - Google Patents
Core-shell structure polymer cement modifier, preparation method and cement-based material Download PDFInfo
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- CN111777717A CN111777717A CN202010660796.9A CN202010660796A CN111777717A CN 111777717 A CN111777717 A CN 111777717A CN 202010660796 A CN202010660796 A CN 202010660796A CN 111777717 A CN111777717 A CN 111777717A
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- 239000004568 cement Substances 0.000 title claims abstract description 60
- 239000011258 core-shell material Substances 0.000 title claims abstract description 42
- 239000003607 modifier Substances 0.000 title claims abstract description 33
- 239000000463 material Substances 0.000 title claims abstract description 28
- 239000011414 polymer cement Substances 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 239000000839 emulsion Substances 0.000 claims abstract description 92
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000003999 initiator Substances 0.000 claims abstract description 37
- 239000002245 particle Substances 0.000 claims abstract description 23
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000006172 buffering agent Substances 0.000 claims abstract description 19
- 239000003995 emulsifying agent Substances 0.000 claims abstract description 15
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000008367 deionised water Substances 0.000 claims abstract description 12
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 12
- 229920001909 styrene-acrylic polymer Polymers 0.000 claims description 48
- 239000004576 sand Substances 0.000 claims description 21
- 238000003756 stirring Methods 0.000 claims description 19
- 239000004816 latex Substances 0.000 claims description 18
- 229920000126 latex Polymers 0.000 claims description 18
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 15
- 239000000872 buffer Substances 0.000 claims description 14
- 238000005303 weighing Methods 0.000 claims description 14
- 229920000642 polymer Polymers 0.000 claims description 13
- 239000007787 solid Substances 0.000 claims description 12
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 8
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000011398 Portland cement Substances 0.000 claims description 5
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical group [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 230000006911 nucleation Effects 0.000 claims description 2
- 238000010899 nucleation Methods 0.000 claims description 2
- 230000005855 radiation Effects 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 description 10
- 239000011083 cement mortar Substances 0.000 description 8
- 239000004567 concrete Substances 0.000 description 7
- 239000011148 porous material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 241000238367 Mya arenaria Species 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 238000007720 emulsion polymerization reaction Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000010559 graft polymerization reaction Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 229920005604 random copolymer Polymers 0.000 description 1
- 230000007928 solubilization Effects 0.000 description 1
- 238000005063 solubilization Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F257/00—Macromolecular compounds obtained by polymerising monomers on to polymers of aromatic monomers as defined in group C08F12/00
- C08F257/02—Macromolecular compounds obtained by polymerising monomers on to polymers of aromatic monomers as defined in group C08F12/00 on to polymers of styrene or alkyl-substituted styrenes
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Graft Or Block Polymers (AREA)
Abstract
The invention discloses a core-shell structure polymer cement modifier, a preparation method and a cement-based material, wherein the cement modifier comprises a first component and a second component; the first component comprises: styrene, first deionized water, an emulsifier part, a first buffering agent and a first initiator; the second component comprises: the emulsion comprises a seed emulsion, second deionized water, a second initiator and a butyl acrylate second buffering agent. The cement modifier is in an emulsion state, the size of emulsion particles is controllable, the particle size distribution is narrow and easy to operate, the repeatability is good, the film forming temperature of the emulsion particles is low, the emulsion particles are filled into holes of cement and can be condensed into a film in a wider using temperature range, the holes and cracks are sealed, the impermeability of the cement is improved, and the durability of the cement is improved; the cement-based material added with the cement modifier has obviously improved fluidity, water retention property, caking property, wear resistance, freeze-thaw resistance, radiation resistance, mechanical strength and extensibility compared with common cement.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a core-shell structure polymer cement modifier, a preparation method of the core-shell structure polymer cement modifier, a cement-based material containing the core-shell structure polymer cement modifier and a preparation method of the cement-based material.
Background
Concrete and cement mortar are the most widely used and most used building materials worldwide. Concrete and cement mortar are basically non-uniform porous materials (the diameter of large pores is larger than 1 mu m, the diameter of capillary pores is between 0.1 and 1.0 mu m, and the diameter of fine pores is smaller than 0.1 mu m), and under the erosion action of external aggressive media such as carbon dioxide, water, chloride ions, sulfate and the like, the concrete and the cement mortar can be damaged in an accelerated way, so that the service life is greatly shortened. The main measures for improving the durability of concrete and cement mortar are to reduce the permeability and improve the impermeability. In the prior art, the impermeability of concrete and cement mortar is usually improved by using a core-shell structure polymer cement modifier, the particle diameter of the core-shell structure polymer is 0.1-1.0 μm, the core-shell structure polymer is added into the concrete and cement mortar, the particles of the core-shell structure polymer can fill the holes of the concrete and cement mortar, and when the use environment temperature is higher than the lowest film-forming temperature of the core-shell structure polymer emulsion, the core-shell structure polymer emulsion particles can be condensed into a film, thereby having a sealing effect on the holes and cracks. The cement modifier has the defects that the existing cement modifiers with core-shell structure polymers are generally in a soft core-shell structure, the film forming temperature of the core-shell structure polymers is high, and the film forming is difficult in the environment with high use temperature.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems that the core-shell structure polymer cement modifier is in a soft core-shell structure, the film forming temperature is higher than the use environment temperature, and the film forming is difficult in the prior art, the invention aims to provide the core-shell structure polymer cement modifier, the preparation method and the cement-based material, wherein the cement modifier is in an emulsion state, the size of emulsion particles is controllable, the particle size distribution is narrow and easy to operate, the repeatability is good, the lowest film forming temperature of the emulsion particles can reach 22 ℃, the emulsion particles are filled into holes of cement, can be condensed into a film in a wider use temperature range, and have a sealing effect on the holes and cracks, so that the impermeability of the cement is improved, and the durability of the cement is improved; the cement-based material added with the cement modifier has obviously improved fluidity, water retention property, caking property, wear resistance, freeze-thaw resistance, radiation resistance, mechanical strength and extensibility compared with common cement.
2. Technical scheme
In order to achieve the purpose, the invention adopts the following technical scheme:
a core-shell structure polymer cement modifier is characterized by comprising a first component and a second component; the first component comprises the following components in parts by mass: 20-30 parts of styrene, 45-60 parts of first deionized water, 0.5-1.2 parts of an emulsifier, 0.05-1.5 parts of a first buffering agent and 0.15-0.3 part of a first initiator; the second component includes: 45-55 parts of seed emulsion, 45-60 parts of second deionized water, 0.15-0.3 part of second initiator, 25-35 parts of butyl acrylate and 0.04-0.08 part of second buffering agent.
In a specific embodiment of the present invention, the emulsifier is sodium dodecyl sulfate, which plays roles of emulsification, solubilization and dispersion during the polymerization of the first component, plays an important role in the stability of emulsion polymerization and the performance of the synthesized product, and can keep the charge density on the surface of the emulsion particles unchanged.
In a specific embodiment of the present invention, the first buffer and the second buffer are NaHCO3And the pH value of the system is adjusted to maintain stability.
In a specific embodiment of the present invention, the first initiator and the second initiator are potassium persulfate, which has great influence on emulsion stability, reaction rate and particle morphology, and can eliminate homogeneous nucleation.
The invention also aims to provide a preparation method of the core-shell structure polymer cement modifier, which is characterized by comprising the following steps:
1) preparing a 'core' in the styrene-acrylic emulsion, namely a seed emulsion; accurately weighing styrene, first deionized water, an emulsifier, a first buffering agent and a first initiator according to the proportion; adding an emulsifier, a first buffering agent and first deionized water into a reactor, and stirring for dissolving; continuously heating to 70 ℃, adding styrene, continuously stirring, dissolving a first initiator in 10 parts of water, adding the first initiator into the water while stirring for 10min, and turning off the stirrer after 1h to obtain seed emulsion; the water used for dissolving the first initiator is added with water;
2) preparing a shell in the styrene-acrylic emulsion, namely PS-g-PBA latex; accurately weighing a seed emulsion, second deionized water, a second initiator, butyl acrylate and a second buffering agent according to the proportion, wherein the seed emulsion is obtained in the step 1); dissolving a second buffering agent in 10 parts of water, mixing the second buffering agent with the seed emulsion, and continuously heating to 70 ℃; dissolving a second initiator in 10 parts of water, mixing after reaching the temperature, then slowly dropwise adding butyl acrylate, reacting for 1h after all the butyl acrylate is dropwise added, and turning off a stirrer to obtain styrene-acrylic emulsion, namely PS-g-PBA latex; detecting the polymer solid content; the second buffer and the second initiator are dissolved by using water as external water.
The invention also aims to provide a cement-based material containing the core-shell structure polymer cement modifier, which is characterized by comprising the following components in parts by mass: 1.5-3 parts of styrene-acrylic emulsion, 25-35 parts of cement, 7-15 parts of water and 85-100 parts of sand; 1.5-3 parts of styrene-acrylic emulsion is mass parts of core-shell structure polymer solid excluding water; the cement is ordinary portland cement; the sand is one or more of fine sand, medium sand and coarse sand; the water is ordinary water.
A method for preparing a cement-based material containing a core-shell structure polymer cement modifier comprises the following steps: accurately weighing styrene-acrylic emulsion, cement, water and sand according to the proportion; mixing cement, water, sand and styrene-acrylic emulsion, and stirring to obtain the cement-based material containing the core-shell structure polymer cement modifier.
3. Advantageous effects
The invention has the beneficial effects that: the cement modifier of the core-shell structure polymer, namely the styrene-acrylic emulsion, is obtained by a seed emulsion graft polymerization technology, and the technology has the advantages that the size of latex particles can be effectively controlled, the particle size distribution of the obtained polymer latex particles is narrow, the operation is easy, the repeatability is good, and particularly, special products with the core-shell structure can be easily obtained; the styrene-acrylic emulsion is PS-g-PBA emulsion, the inner layer and the outer layer of PS-g-PBA emulsion particles are grafted, the grafted copolymer with the core-shell structure has a plurality of excellent performances compared with a random copolymer, and the emulsion can also obviously improve the fluidity, water retention property, cohesiveness, wear resistance, freeze-thaw resistance, radiation resistance, mechanical strength and extensibility of the cement-based material under the condition that the raw material compositions are completely the same; the PS-g-PBA emulsion belongs to a soft shell and hard core structure, and the lowest film forming temperature can reach 22 ℃, so that styrene-acrylic emulsion particles can be condensed into a film under the condition of low use temperature, and the film can seal holes and cracks; the cement-based material containing the core-shell structure polymer cement modifier is impervious cement, and the styrene-acrylic emulsion particles can fill holes in the cement to improve the impermeability of the cement, so that the cement has better durability;
Detailed Description
The present invention will be described in detail with reference to specific examples.
Example 1
A cement-based material containing a core-shell structure polymer cement modifier (styrene-acrylic emulsion) is prepared by the following steps:
1) the styrene-acrylic emulsion is PS-g-PBA latex and is a latex particle with a core-shell structure, and the core (a first component) comprises the following components in parts by mass:
the emulsifier is sodium dodecyl sulfate.
The first buffer is NaHCO3。
The first initiator is potassium persulfate.
The "core" described above, i.e. the seed emulsion. And accurately weighing the raw materials according to the proportion. Adding an emulsifier, a buffering agent and water into a reactor, and stirring for dissolving. Continuously heating to 70 ℃, adding styrene, continuously stirring, dissolving the initiator in 10 parts of water, adding the first initiator during stirring for 10min, and stopping the stirrer after 1h to obtain the seed emulsion.
2) The shell (second component) comprises the following components in parts by mass:
the second initiator is potassium persulfate.
The second buffer is NaHCO3。
The "shell" described above, i.e., the PS-g-PBA latex. Accurately weighing the raw materials according to the proportion, wherein 50 parts of the seed emulsion is obtained in the step. The buffer was dissolved in 10 parts of water and mixed with the seed emulsion, and the temperature was continuously raised to 70 ℃. Dissolving an initiator in 10 parts of water, mixing after reaching the temperature, then slowly dropwise adding butyl acrylate, reacting for 1h after all dropwise adding, and turning off a stirrer to obtain the styrene-acrylic emulsion, namely PS-g-PBA latex. The solid content was measured.
3) The styrene-acrylic emulsion cement-based material comprises the following components in parts by mass:
the styrene-acrylic emulsion 2 parts is the mass part of PS-g-PBA solid, except water.
The cement is P.042.5R portland cement.
The sand is coarse sand and is sieved by a 0.75cm sieve.
The styrene-acrylic emulsion cement-based material. And accurately weighing the raw materials according to the proportion, wherein 2 parts of styrene-acrylic emulsion is obtained in the step, and 2 parts of styrene-acrylic emulsion is the mass part of contained PS-g-PBA solid. Mixing cement, water, sand and styrene-acrylic emulsion, and stirring to obtain the styrene-acrylic emulsion cement-based material.
Example 2
A cement-based material containing a core-shell structure polymer cement modifier (styrene-acrylic emulsion) is prepared by the following steps:
1) the styrene-acrylic emulsion is PS-g-PBA latex and is a latex particle with a core-shell structure. The core comprises the following components in parts by mass:
the emulsifier is sodium dodecyl sulfate.
The first buffer is NaHCO3。
The first initiator is potassium persulfate.
The "core" described above, i.e. the seed emulsion. And accurately weighing the raw materials according to the proportion. Adding an emulsifier, a buffering agent and water into a reactor, and stirring for dissolving. Continuously heating to 70 ℃, adding styrene, continuously stirring, dissolving the initiator in 10 parts of water, adding the first initiator during stirring for 10min, and stopping the stirrer after 1h to obtain the seed emulsion.
2) The shell comprises the following components in parts by mass:
the second initiator is potassium persulfate.
The second buffer is NaHCO3。
The "shell" described above, i.e., the PS-g-PBA latex. Accurately weighing the raw materials according to the proportion, wherein 50 parts of the seed emulsion is obtained in the step. The buffer was dissolved in 10 parts of water and mixed with the seed emulsion, and the temperature was continuously raised to 70 ℃. Dissolving an initiator in 10 parts of water, mixing after reaching the temperature, then slowly dropwise adding butyl acrylate, reacting for 1h after all dropwise adding, and turning off a stirrer to obtain the styrene-acrylic emulsion, namely PS-g-PBA latex. The solid content was measured.
3) The styrene-acrylic emulsion cement-based material comprises the following components in parts by mass:
the styrene-acrylic emulsion 2.5 parts is mass parts of PS-g-PBA solid, except water.
The cement is P.042.5R portland cement.
The sand is coarse sand and is sieved by a 0.75cm sieve.
The styrene-acrylic emulsion cement-based material. And accurately weighing the raw materials according to the proportion, wherein 2.5 parts of styrene-acrylic emulsion is obtained in the step, and 2.5 parts of styrene-acrylic emulsion is the mass part of PS-g-PBA solid. Mixing cement, water, sand and styrene-acrylic emulsion, and stirring to obtain the styrene-acrylic emulsion cement-based material.
Example 3
A cement-based material containing a core-shell structure polymer cement modifier (styrene-acrylic emulsion) is prepared by the following steps:
1) the styrene-acrylic emulsion is PS-g-PBA latex and is a latex particle with a core-shell structure. The core comprises the following components in parts by mass:
the emulsifier is sodium dodecyl sulfate.
The first buffer is NaHCO3。
The first initiator is potassium persulfate.
The "core" described above, i.e. the seed emulsion. And accurately weighing the raw materials according to the proportion. Adding an emulsifier, a buffering agent and water into a reactor, and stirring for dissolving. Continuously heating to 70 ℃, adding styrene, continuously stirring, dissolving the initiator in 10 parts of water, adding the first initiator during stirring for 10min, and stopping the stirrer after 1h to obtain the seed emulsion.
2) The shell comprises the following components in parts by mass:
the second initiator is potassium persulfate.
The second buffer is NaHCO3。
The "shell" described above, i.e., the PS-g-PBA latex. Accurately weighing the raw materials according to the proportion, wherein 50 parts of the seed emulsion is obtained in the step. The buffer was dissolved in 10 parts of water and mixed with the seed emulsion, and the temperature was continuously raised to 70 ℃. Dissolving an initiator in 10 parts of water, mixing after reaching the temperature, then slowly dropwise adding butyl acrylate, reacting for 1h after all dropwise adding, and turning off a stirrer to obtain the styrene-acrylic emulsion, namely PS-g-PBA latex. The solid content was measured.
3) The styrene-acrylic emulsion cement-based material comprises the following components in parts by mass:
1.8 parts of the styrene-acrylic emulsion is the mass part of PS-g-PBA solid except water.
The cement is P.042.5R portland cement.
The sand is coarse sand and is sieved by a 0.75cm sieve.
The styrene-acrylic emulsion cement-based material. And accurately weighing the raw materials according to the proportion, wherein 1.8 parts of styrene-acrylic emulsion is obtained in the step, and 1.8 parts of styrene-acrylic emulsion is the mass part of PS-g-PBA solid. Mixing cement, water, sand and styrene-acrylic emulsion, and stirring to obtain the styrene-acrylic emulsion cement-based material.
The mortars prepared in examples 1 to 3 were sampled for fluidity testing, and another sample was subjected to standard curing for 28d and then subjected to impermeability and flexural strength testing, and the test results are shown in table 1:
TABLE 1 EXAMPLES 1-3 Styrene-acrylic emulsion Cement-based materials Performance test results
As can be seen from Table 1, the fluidity, the impermeability grade and the flexural strength of the styrene-acrylic emulsion cement-based material are all obviously higher than those of pure cement mortar.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications that can be made by using the equivalent structures or equivalent processes of the present invention in the specification or directly or indirectly applied to other related technical fields are also included in the scope of the present invention.
Claims (6)
1. A core-shell structure polymer cement modifier is characterized in that: comprises a first component and a second component; the first component comprises the following components in parts by mass: 20-30 parts of styrene, 45-60 parts of first deionized water, 0.5-1.2 parts of an emulsifier, 0.05-1.5 parts of a first buffering agent and 0.15-0.3 part of a first initiator; the second component includes: 45-55 parts of seed emulsion, 45-60 parts of second deionized water, 0.15-0.3 part of second initiator, 25-35 parts of butyl acrylate and 0.04-0.08 part of second buffering agent.
2. The core-shell structure polymer cement modifier according to claim 1, characterized in that: the emulsifier is sodium dodecyl sulfate.
3. The core-shell structure polymer cement modifier according to claim 1, characterized in that: the first buffer and the second buffer are NaHCO3。
4. The core-shell structure polymer cement modifier according to claim 1, characterized in that: the first initiator and the second initiator are potassium persulfate, which has great influence on emulsion stability, reaction rate and particle morphology and can eliminate homogeneous nucleation.
5. A method for preparing the core-shell structure polymer cement modifier according to any one of claims 1 to 4, which is characterized in that: the method comprises the following steps:
1) preparing a 'core' in the styrene-acrylic emulsion, namely a seed emulsion; accurately weighing styrene, first deionized water, an emulsifier, a first buffering agent and a first initiator according to the proportion; adding an emulsifier, a first buffering agent and first deionized water into a reactor, and stirring for dissolving; continuously heating to 70 ℃, adding styrene, continuously stirring, dissolving a first initiator in 10 parts of water, adding the first initiator into the water while stirring for 10min, and turning off the stirrer after 1h to obtain seed emulsion;
2) preparing a shell in the styrene-acrylic emulsion, namely PS-g-PBA latex; accurately weighing a seed emulsion, second deionized water, a second initiator, butyl acrylate and a second buffering agent according to the proportion, wherein the seed emulsion is obtained in the step 1); dissolving a second buffering agent in 10 parts of water, mixing the second buffering agent with the seed emulsion, and continuously heating to 70 ℃; dissolving a second initiator in 10 parts of water, mixing after reaching the temperature, then slowly dropwise adding butyl acrylate, reacting for 1h after all the butyl acrylate is dropwise added, and turning off a stirrer to obtain styrene-acrylic emulsion, namely PS-g-PBA latex; the polymer solids content was determined.
6. A cement-based material containing a core-shell structure polymer cement modifier is characterized in that: comprises the following components in parts by weight: 1.5-3 parts of styrene-acrylic emulsion, 25-35 parts of cement, 7-15 parts of water and 85-100 parts of sand; 1.5-3 parts of styrene-acrylic emulsion is the mass part of the core-shell structure polymer prepared by the preparation method of the core-shell structure polymer cement modifier in the claim 5, excluding water; the cement is ordinary portland cement; the sand is one or more of fine sand, medium sand and coarse sand.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103073220A (en) * | 2013-01-16 | 2013-05-01 | 江苏博特新材料有限公司 | Emulsion type concrete curing agent |
| CN105837115A (en) * | 2016-03-29 | 2016-08-10 | 同济大学 | High strength polymer modified cement mortar, preparation method and application thereof |
| WO2020045515A1 (en) * | 2018-08-31 | 2020-03-05 | 株式会社日本触媒 | Additive for hydraulic material |
-
2020
- 2020-07-10 CN CN202010660796.9A patent/CN111777717A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103073220A (en) * | 2013-01-16 | 2013-05-01 | 江苏博特新材料有限公司 | Emulsion type concrete curing agent |
| CN105837115A (en) * | 2016-03-29 | 2016-08-10 | 同济大学 | High strength polymer modified cement mortar, preparation method and application thereof |
| WO2020045515A1 (en) * | 2018-08-31 | 2020-03-05 | 株式会社日本触媒 | Additive for hydraulic material |
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| Title |
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| 彭立新 等: "核/壳苯丙乳液的合成", 《化工生产与技术》 * |
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