CN114426421A - Polyurethane modified foam concrete and preparation method thereof - Google Patents
Polyurethane modified foam concrete and preparation method thereof Download PDFInfo
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- CN114426421A CN114426421A CN202210071480.5A CN202210071480A CN114426421A CN 114426421 A CN114426421 A CN 114426421A CN 202210071480 A CN202210071480 A CN 202210071480A CN 114426421 A CN114426421 A CN 114426421A
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- foaming agent
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- 239000004814 polyurethane Substances 0.000 title claims abstract description 46
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 46
- 239000011381 foam concrete Substances 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title abstract description 11
- 239000006260 foam Substances 0.000 claims abstract description 27
- 239000004088 foaming agent Substances 0.000 claims abstract description 27
- 239000004568 cement Substances 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000000839 emulsion Substances 0.000 claims abstract description 17
- 238000003756 stirring Methods 0.000 claims abstract description 17
- 239000003381 stabilizer Substances 0.000 claims abstract description 16
- 238000002156 mixing Methods 0.000 claims abstract description 14
- 239000011398 Portland cement Substances 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims abstract description 5
- 239000007864 aqueous solution Substances 0.000 claims abstract description 3
- 238000007865 diluting Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 7
- RFRMMZAKBNXNHE-UHFFFAOYSA-N 6-[4,6-dihydroxy-5-(2-hydroxyethoxy)-2-(hydroxymethyl)oxan-3-yl]oxy-2-(hydroxymethyl)-5-(2-hydroxypropoxy)oxane-3,4-diol Chemical compound CC(O)COC1C(O)C(O)C(CO)OC1OC1C(O)C(OCCO)C(O)OC1CO RFRMMZAKBNXNHE-UHFFFAOYSA-N 0.000 claims description 3
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 3
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 3
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 3
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 3
- 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 claims description 3
- 102000004169 proteins and genes Human genes 0.000 claims description 3
- 108090000623 proteins and genes Proteins 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims 1
- 238000010521 absorption reaction Methods 0.000 abstract description 7
- 239000000243 solution Substances 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 6
- 239000004567 concrete Substances 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- 238000007906 compression Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 239000008259 solid foam Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
Images
Classifications
-
- 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
- C04B24/28—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/282—Polyurethanes; Polyisocyanates
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses polyurethane modified foam concrete and a preparation method thereof, wherein the polyurethane modified foam concrete comprises the following raw materials in parts by weight: 400-800 parts of ordinary portland cement, 6-50 parts of polyurethane emulsion, 2-5 parts of foaming agent, 0.02-0.04 part of foam stabilizer and 180-300 parts of water; the preparation method comprises the following steps: diluting a foaming agent in a ratio of 1:30, adding a foam stabilizer, and uniformly stirring to prepare a foaming agent aqueous solution; uniformly mixing the polyurethane emulsion with water, and stirring the mixture with cement to form cement paste; stirring the foaming agent water solution at a high speed to prepare foam; and uniformly mixing the prepared foam and the cement paste to obtain the polyurethane modified foam concrete. The polyurethane modified foam concrete prepared by the invention improves the mechanical property and energy absorption property of the foam concrete.
Description
Technical Field
The invention relates to concrete and preparation, in particular to polyurethane modified foam concrete and a preparation method thereof.
Background
The foam concrete has the properties of light weight, heat preservation, heat insulation, sound insulation, fire resistance, energy absorption, vibration reduction and the like, and is widely applied to building engineering. However, the traditional foam concrete has low strength, large brittleness and easy cracking, and the improvement of the strength, the improvement of the brittleness and the increase of the deformation energy absorption performance are particularly important. The existing method is that high polymer is made into solid foam and is doped into a cement matrix, the existing method is complex in preparation process, mainly aims at reducing the heat conductivity coefficient of foam concrete, has no obvious effect of improving the strength, and does not improve the toughness and the energy absorption performance of the foam concrete.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide polyurethane modified foam concrete, which solves the problems of low strength, high brittleness and poor energy absorption performance of the existing foam concrete.
The invention also aims to provide a preparation method of the polyurethane modified foam concrete, which solves the problem of complicated process of the existing preparation method.
The technical scheme is as follows: the polyurethane modified foam concrete comprises the following raw materials in parts by weight:
400-800 parts of ordinary portland cement, 6-50 parts of polyurethane emulsion, 2-5 parts of foaming agent, 0.02-0.04 part of foam stabilizer and 180-300 parts of water.
Wherein the pH value of the polyurethane emulsion is 7-9, the viscosity is less than 500mPa.S, and the solid content is more than 35%.
The foam stabilizer is at least one of hydroxypropyl methyl cellulose and hydroxyethyl cellulose.
The foaming agent is at least one of a protein foaming agent and a composite foaming agent.
The preparation method of the polyurethane modified foam concrete comprises the following steps:
(1) diluting a foaming agent with water in a ratio of 1:30, adding a foam stabilizer, magnetically stirring until the foaming agent is uniformly mixed, and stirring a foaming agent aqueous solution until foams are soft and fine;
(2) fully and uniformly mixing the polyurethane emulsion and water, adding the mixture into cement, and uniformly stirring to form cement paste;
(3) and (2) adding the foam prepared in the step (1) into the cement paste, stirring at a low speed, and uniformly mixing to obtain the polyurethane modified foam concrete.
Wherein, the low-speed stirring speed in the step (3) is 120-150 r/min.
Has the advantages that: the invention adopts a physical foaming mode, and the pore structure of the hardened foam concrete is more uniform; the polyurethane emulsion and water are uniformly mixed and then added into cement, and the mixture is stirred to form cement paste with good interface performance; moreover, the polyurethane can be filled in the pores of cement hydration products in the hydration process and intertwined with each other to form an interpenetrating network system, and meanwhile, polar groups (such as-OH, -NCO and the like) on the polyurethane molecular chain segment can perform a complex reaction with Ca2+ in the cement slurry to form a chemical bond, so that the mechanical property and the energy absorption property of the foam concrete are improved.
Drawings
FIG. 1 is a stress-strain plot of examples 1-3 and a comparative example.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
In the following examples: the ordinary Portland cement is PII 52.5-grade ordinary Portland cement. The polyurethane emulsion is semitransparent milky white liquid, the pH value is 7-9, the viscosity is less than 500mPa.S (25 ℃), and the solid content is more than 35%. The foaming agent is at least one of protein foaming agent and composite foaming agent. The foam stabilizer comprises at least one of hydroxypropyl methyl cellulose and hydroxyethyl cellulose. The water is tap water or drinking water, and meets the requirements of concrete water standards (JGJ 63-2006). The water-to-gel ratio is 0.40, and the energy absorbed by the unit volume of the polyurethane modified foam concrete in the uniaxial compression process can be expressed by the deformation work of the unit volume:
in the formula epsilonmFor any strain in uniaxial compression,. sigmamIs epsilonmStress corresponding to compression.
Example 1
The polyurethane modified foam concrete is prepared by mixing the following raw materials in parts by mass: 600 parts of ordinary portland cement, 6 parts of polyurethane emulsion, 3 parts of foaming agent, 0.03 part of foam stabilizer and 240 parts of water.
Example 2
The polyurethane modified foam concrete is prepared by mixing the following raw materials in parts by mass: 600 parts of ordinary portland cement, 9 parts of polyurethane emulsion, 3 parts of foaming agent, 0.03 part of foam stabilizer and 240 parts of water.
Example 3
The polyurethane modified foam concrete is prepared by mixing the following raw materials in parts by mass: 600 parts of ordinary portland cement, 12 parts of polyurethane emulsion, 3 parts of foaming agent, 0.03 part of foam stabilizer and 240 parts of water.
The preparation method of the polyurethane modified foam concrete of examples 1 to 3 includes the following steps:
(1) the foaming agent was diluted with water at a ratio of 1:30, incorporated with a foam stabilizer, and stirred with a magnetic stirrer for 3 hours until mixed uniformly.
(2) And (3) fully and uniformly mixing the polyurethane emulsion and water, adding the mixture into cement, and uniformly stirring to form cement paste.
(3) And stirring the foaming agent water solution at a high speed for 3-5 minutes until the foam is soft and fine.
(4) And adding the prepared foam into the cement paste, stirring at a low speed for 2-3 minutes, and uniformly mixing to obtain the polyurethane modified foam concrete.
Comparative example
The foam concrete without adding the polyurethane emulsion comprises the following specific raw materials: 600 parts of ordinary portland cement, 3 parts of a foaming agent, 0.03 part of a foam stabilizer and 240 parts of water.
The foam stabilizer with a proper proportion is added, so that the viscosity of the solution and the viscoelasticity of a liquid film can be increased, the foam stability is improved, and the foam stabilizer is not too viscous; the polyurethane emulsion belongs to organic matters, most of which have a retarding effect on concrete, so that the cement is slowly coagulated and hardened, the mixing amount is too high, the early strength of the concrete is low, and the phenomenon of die collapse is easy to occur; the low mixing amount has little effect on improving the strength of the foam concrete, and the proper selection of the mixing amount of the polyurethane emulsion ensures the performance; the larger the water-cement ratio is, the better the flowability of the slurry is, the easier the foam and the slurry are mixed and stirred to enter the slurry, and the easier the foam and the slurry are dispersed uniformly in the stirring process. However, when the water-cement ratio exceeds a certain range, the performance of the foam concrete is reduced along with the reduction of the water-cement ratio, especially the strength value, so that the invention selects the proper water-cement ratio to ensure the performance.
Cube test pieces of 100mm are prepared for the examples 1, 2, 3 and the comparative example, the cube test pieces are demolded after 24h of pouring, then the cube test pieces are placed in a concrete standard curing room for curing for 28 days, and the fluidity, the compressive strength and the stress-strain curve of the polyurethane modified foam concrete are tested by referring to JG/T266-2011 foam concrete, the stress-strain curve is shown in figure 1, and the test results of the data are shown in table 1.
TABLE 1
| Numbering | Fluidity/mm | 7d compressive strength/MPa | 28d compressive strength/MPa | Energy absorbing/MJm-3 |
| Comparative example | 172 | 2.5 | 3.1 | 0.23 |
| Example 1 | 169 | 3.3 | 3.7 | 0.25 |
| Example 2 | 170 | 3.7 | 4.2 | 0.29 |
| Example 3 | 168 | 4.4 | 5.6 | 0.33 |
According to the test results, the polyurethane modified foam concrete prepared by the invention has good fluidity, compared with the comparative example, the compressive strength of 7d and 28d is improved in examples 1, 2 and 3, the energy absorbed by unit volume in the uniaxial compression process is higher than that of the comparative example, and the energy absorption performance is improved.
Claims (6)
1. The polyurethane modified foam concrete is characterized by comprising the following raw materials in parts by weight:
400-800 parts of ordinary portland cement, 6-50 parts of polyurethane emulsion, 2-5 parts of foaming agent, 0.02-0.04 part of foam stabilizer and 180-300 parts of water.
2. The polyurethane modified foam concrete according to claim 1, wherein the polyurethane emulsion has a pH value of 7-9, a viscosity of less than 500mPa.S and a solid content of more than 35%.
3. The polyurethane modified foam concrete according to claim 1, wherein the foam stabilizer is at least one of hydroxypropyl methylcellulose and hydroxyethyl cellulose.
4. The polyurethane modified foamed concrete according to claim 1, wherein the foaming agent is at least one of a protein foaming agent and a composite foaming agent.
5. The method of producing a polyurethane modified foam concrete according to any one of claims 1 to 5, comprising the steps of:
(1) diluting a foaming agent with water in a ratio of 1:30, adding a foam stabilizer, magnetically stirring until the foaming agent is uniformly mixed, and stirring a foaming agent aqueous solution until foams are soft and fine;
(2) fully and uniformly mixing the polyurethane emulsion and water, adding the mixture into cement, and uniformly stirring to form cement paste;
(3) and (2) adding the foam prepared in the step (1) into the cement paste, stirring at a low speed, and uniformly mixing to obtain the polyurethane modified foam concrete.
6. The method for preparing polyurethane modified foam concrete according to claim 5, wherein the low speed stirring speed in step (3) is 120-150 r/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210071480.5A CN114426421A (en) | 2022-01-21 | 2022-01-21 | Polyurethane modified foam concrete and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210071480.5A CN114426421A (en) | 2022-01-21 | 2022-01-21 | Polyurethane modified foam concrete and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN114426421A true CN114426421A (en) | 2022-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210071480.5A Pending CN114426421A (en) | 2022-01-21 | 2022-01-21 | Polyurethane modified foam concrete and preparation method thereof |
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| Country | Link |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002028798A2 (en) * | 2000-09-29 | 2002-04-11 | Dow Global Technologies Inc. | A stable aqueous dispersion of a preformed polymer in concrete and cementatious composites |
| CN102701687A (en) * | 2012-06-29 | 2012-10-03 | 安徽省思维新型建材有限公司 | Insulated fireproof material of polyurethane cement foam and preparation method of insulated fireproof material |
| CN106007505A (en) * | 2016-05-20 | 2016-10-12 | 河北建筑工程学院 | Polyurethane foam concrete and preparation method thereof |
| US20180037500A1 (en) * | 2016-05-25 | 2018-02-08 | W. Robert Wilson | Polymer modified cement adhesive for providing high friction surfacing |
-
2022
- 2022-01-21 CN CN202210071480.5A patent/CN114426421A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002028798A2 (en) * | 2000-09-29 | 2002-04-11 | Dow Global Technologies Inc. | A stable aqueous dispersion of a preformed polymer in concrete and cementatious composites |
| CN102701687A (en) * | 2012-06-29 | 2012-10-03 | 安徽省思维新型建材有限公司 | Insulated fireproof material of polyurethane cement foam and preparation method of insulated fireproof material |
| CN106007505A (en) * | 2016-05-20 | 2016-10-12 | 河北建筑工程学院 | Polyurethane foam concrete and preparation method thereof |
| US20180037500A1 (en) * | 2016-05-25 | 2018-02-08 | W. Robert Wilson | Polymer modified cement adhesive for providing high friction surfacing |
Non-Patent Citations (2)
| Title |
|---|
| 吴燕华等: "混凝土建筑物表面修护新型材料试验研究", 《山西建筑》 * |
| 詹贺等: "聚氨酯混合砂浆物理力学性能试验研究", 《江西建材》 * |
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Application publication date: 20220503 |