CN110642552A - Preparation method of anti-cracking epoxy resin concrete - Google Patents
Preparation method of anti-cracking epoxy resin concrete Download PDFInfo
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- CN110642552A CN110642552A CN201911003394.5A CN201911003394A CN110642552A CN 110642552 A CN110642552 A CN 110642552A CN 201911003394 A CN201911003394 A CN 201911003394A CN 110642552 A CN110642552 A CN 110642552A
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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
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/10—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B26/14—Polyepoxides
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00991—Uses not provided for elsewhere in C04B2111/00 for testing
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
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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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Abstract
The invention discloses a preparation method of anti-cracking epoxy resin concrete, and belongs to the technical field of building materials. Weighing the following components in parts by weight: 50-60 parts of epoxy resin, 30-45 parts of sand, 20-28 parts of additive and 5-8 parts of curing agent, mixing the epoxy resin and the sand in a stirrer, adding the additive and the curing agent into the stirrer, stirring and mixing for 20-30 min at the temperature of 30-60 ℃ and the rotating speed of 250-380 r/min to obtain a blank, injecting the blank into a mold, curing at the temperature of 150-180 ℃ for 30-50 min, and demolding to obtain the anti-cracking epoxy resin concrete. The anti-cracking epoxy resin concrete obtained by the invention has excellent anti-cracking performance and flexibility.
Description
Technical Field
The invention discloses a preparation method of anti-cracking epoxy resin concrete, and belongs to the technical field of building materials.
Background
The bridge expansion joint directly bears the impact of wheel load and is exposed in the atmosphere for a long time, so that the bridge expansion joint is extremely easy to damage and high in maintenance cost. After the bridge expansion joint suffered to destroy, influence the driving travelling comfort on the one hand, made the driver lack the sense of security, on the other hand leads to the vehicle to the impact of bridge superstructure, influences bridge major structure's atress, reduces bridge life. Statistical data indicate that an expansion joint is the weakest part of a bridge structure and has a service life much shorter than the design life of the bridge. Frequent repair or replacement of the expansion joint not only seriously affects the smoothness and safety of traffic, but also brings resource waste and environmental problems, and improves the maintenance cost of the bridge.
The bridge expansion joints mainly applied at present have the following five types: steel plate type, modular type, rubber plate type, caulking type and seamless type. Except that the seamless expansion joint directly bonds the telescopic body with the pavement layer to realize the seamless structure of the bridge, the other types of expansion joints are all required to be provided with transition layer concrete between the telescopic body and the pavement layer to realize the integration of the expansion joint and the main beam structure. From the structural and functional analysis of the bridge expansion joint, the function and function of the concrete in the transition area are mainly embodied in the following three aspects:
(1) the load borne by the expansion joint device at the beam end is transferred to the main beam structure through the concrete in the transition area, so that the stress distribution of the expansion joint device is changed, and the stress borne by the expansion joint device is reduced;
(2) the impact energy received by the expansion joint device at the beam end is transferred to the main beam structure and the bridge deck pavement layer through the concrete in the transition area, so that the impact energy received by the expansion joint device is reduced, and the impact damage of the expansion joint device is reduced or avoided;
(3) the profile steel modulus of expansion joint device is higher, and asphalt concrete pavement layer modulus is lower, and transition zone concrete bonds the great material of both moduli difference and becomes an organic whole, guarantees the integration on road surface, realizes the even transition of material modulus, guarantees the roughness on road surface, the stationarity and the travelling comfort of driving.
The existing bridge expansion joint transition area concrete mainly adopts steel fiber concrete, common concrete (such as C50 concrete) and rapid concrete, but from the use and maintenance conditions in the past projects, the concrete can not meet the requirements of design and actual service life, some concrete even needs to be repaired at intervals of 1-2 years, and three main points are provided for analyzing the reasons that the quality of the concrete does not meet the standard:
(1) the steel fiber concrete, the common concrete and the fast concrete are all brittle materials, have poor bending resistance and impact resistance, and cannot be well adapted to the working environment of the bridge expansion joint which is frequently impacted;
(2) the self cohesive strength and the interface bonding strength are low, the bonding strength between the self cohesive strength and the interface bonding strength and between the self cohesive strength and the concrete beam slab, the embedded rib and the section steel are poor, when the self cohesive strength and the interface bonding strength bear stress, cracks are easy to appear on the bonding interface, once the cracks appear, the function is basically lost, and finally the whole anchoring system is damaged;
(3) because of the interface bonding strength is low, in order to reach corresponding mechanics anchor effect, the surface flatness of beam slab, platform cap back wall, the pre-buried effect of pre-buried muscle, the connection arrangement requirement of pre-buried muscle and shaped steel are high, and this has proposed higher requirement to construction quality control, also leads to the construction quality to be difficult to guarantee. In addition, in the aspect of open traffic time, the maintenance time of the steel fiber concrete and the common concrete is longer, and usually 28 days are needed; although the early strength of the quick concrete is higher than that of steel fiber concrete and common concrete, the quick concrete is brittle, poor in impact resistance and particularly short in service life.
Because the existing bridge repair concrete has many problems, resin concrete is gradually developed, the curing time of the resin concrete is short, the strength is high, but the use of the resin concrete is influenced due to poor toughness, the modification of the resin concrete is mainly realized by adding modified filler, but the filler has poor dispersibility in resin, so how to effectively improve the toughness of the resin concrete and further improve the cracking resistance of the resin concrete still needs to be researched.
Disclosure of Invention
The invention mainly solves the technical problems that: aiming at the problems that the traditional anti-cracking epoxy resin concrete has poor toughness and the anti-cracking performance cannot be further improved due to uneven distribution of modified fillers, the preparation method of the anti-cracking epoxy resin concrete is provided.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a preparation method of anti-cracking epoxy resin concrete comprises the following specific preparation steps:
(1) mixing cetyl trimethyl ammonium bromide and deionized water according to the mass ratio of 1: 30-1: 35, adding urea with the mass of 0.8-0.9 times that of the hexadecyl trimethyl ammonium bromide, and stirring and mixing to obtain a hexadecyl trimethyl ammonium bromide mixed solution;
(2) mixing a mixed solution of hexadecyl trimethyl ammonium bromide and cyclohexane according to a volume ratio of 1.2: 1.0-1.1: 1.0, adding isopropanol which is 0.03-0.06 times of the volume of the mixed solution of the hexadecyl trimethyl ammonium bromide, stirring and mixing to obtain a pretreated mixed solution of the hexadecyl trimethyl ammonium bromide, and mixing the mixed solution of the hexadecyl trimethyl ammonium bromide with ethyl orthosilicate according to the volume ratio of 25: 1-28: 1, mixing, stirring for reaction, filtering, washing, drying and calcining to obtain silicon dioxide microspheres;
(3) mixing the silicon dioxide microspheres with a silane coupling agent according to the mass ratio of 3: 1-4: 1, adding absolute ethyl alcohol with the mass of 10-12 times that of the silica microspheres, stirring for reaction, filtering, and drying to obtain pre-modified silica microspheres, wherein the mass ratio of the pre-modified silica microspheres to the rubber emulsion is 1: 5-1: 6, mixing, standing and filtering to obtain modified silicon dioxide microspheres;
(4) spraying paraffin wax with the mass of 3-4 times that of the modified silicon dioxide microspheres, and freezing to obtain an additive;
(5) weighing the following components in parts by weight: 50-60 parts of epoxy resin, 30-45 parts of sand, 5-10 parts of diluent, 20-28 parts of additive and 5-8 parts of curing agent, mixing the epoxy resin and the sand, adding the additive, the diluent and the curing agent, stirring and mixing to obtain a blank, injection molding the blank, curing at high temperature, and demolding to obtain the anti-cracking epoxy resin concrete.
The silane coupling agent in the step (3) is any one of a silane coupling agent KH-550, a silane coupling agent KH-560 or a silane coupling agent KH-570.
The rubber emulsion in the step (3) is any one of natural rubber emulsion with the solid content of 40-60% or styrene-butadiene rubber emulsion with the solid content of 45-55%.
And (4) the paraffin is the paraffin with the carbon atom number of 20-32.
And (5) the epoxy resin is any one of epoxy resin E-44 or epoxy resin E-51.
And (5) the sand in the step (5) is 120 meshes of sand.
And (5) the curing agent is any one of ethylenediamine, diethylamine or triethylene tetramine.
And (5) the diluent is any one of acetone, cyclohexanone, n-butanol, dibutyl phthalate or dioctyl phthalate.
Polyallylamine which is 0.1-0.2 time of the mass of the blank and an isocyanate mixture which is 0.1-0.2 time of the mass of the blank can be added into the blank in the step (5), wherein the isocyanate mixture is prepared by mixing toluene diisocyanate and calcium bicarbonate according to the mass ratio of 3: 1, mixing to obtain an isocyanate mixture.
The invention has the beneficial effects that:
(1) the invention adds the additive when preparing the anti-cracking epoxy resin concrete, firstly, the additive contains the fibrous mesoporous silicon dioxide, after being added into the product, the fibrous mesoporous silicon dioxide can be used as the winding point of a resin macromolecular chain, thereby improving the anti-cracking strength of the product, secondly, the fibrous mesoporous silicon dioxide in the additive contains rubber macromolecules inside the pore structure, after being added into the product, the rubber macromolecules can be released into the product in the product curing process, thereby improving the toughness of the product, and because the silane coupling agent is used for modifying the silicon dioxide in the preparation process of the additive, the paraffin is also used for spraying the modified silicon dioxide microspheres, thereby the additive can be uniformly distributed in the product after being added into the product, further improving the anti-cracking performance and the toughness of the product, moreover, because the immersed rubber latex contains the solvent which is insoluble in the epoxy resin, in the preparation process of the product, gas is difficult to discharge after the solvent is evaporated after the surface of the product is solidified, so that the gas can enter the pore structure of the fibrous mesoporous silica and extrude and distribute rubber macromolecules in the product, thereby further improving the toughness of the product;
(2) the anti-cracking epoxy resin concrete can be prepared by adding polyallylamine, calcium bicarbonate and isocyanate, the added isocyanate can react with water generated by decomposing calcium bicarbonate in the preparation process of the product so as to generate carbon dioxide and amine compounds, the generated carbon dioxide can promote the discharge and uniform distribution of rubber macromolecular chains in silicon dioxide, the anti-cracking performance of the product is improved, and the formed amine compounds can promote the curing of epoxy resin, so that the curing of the product is more complete, and the anti-cracking performance of the product is improved; and the added polyallylamine can form a cross-linked network under the action of carbon dioxide generated by isocyanate, so that the cracking resistance of the polyallylamine is further improved.
Detailed Description
Mixing cetyl trimethyl ammonium bromide and deionized water according to the mass ratio of 1: 30-1: 35, adding urea with the mass of 0.8-0.9 times that of hexadecyl trimethyl ammonium bromide into the beaker, and stirring and mixing for 30-40 min under the conditions that the temperature is 30-40 ℃ and the rotating speed is 300-350 r/min to obtain hexadecyl trimethyl ammonium bromide mixed solution; mixing a mixed solution of hexadecyl trimethyl ammonium bromide and cyclohexane according to a volume ratio of 1.2: 1.0-1.1: 1.0, adding isopropanol which is 0.03-0.06 times the volume of the mixed solution of the hexadecyl trimethyl ammonium bromide into the mixture of the mixed solution of the hexadecyl trimethyl ammonium bromide and the cyclohexane, stirring and mixing for 30-70 min under the conditions that the temperature is 30-45 ℃ and the rotating speed is 300-380 r/min to obtain a pretreated mixed solution of the hexadecyl trimethyl ammonium bromide, and mixing the pretreated mixed solution of the hexadecyl trimethyl ammonium bromide and ethyl orthosilicate according to the volume ratio of 25: 1-28: 1, mixing, stirring and reacting for 5-6 hours at the temperature of 60-65 ℃ and the rotating speed of 350-380 ℃, filtering to obtain a filter cake, washing the filter cake with absolute ethyl alcohol for 5-8 times, drying for 1-2 hours at the temperature of 60-80 ℃, and calcining for 20-30 minutes at the temperature of 200-250 ℃ to obtain silicon dioxide microspheres; mixing the silicon dioxide microspheres with a silane coupling agent according to the mass ratio of 3: 1-4: 1, adding absolute ethyl alcohol with the mass 10-12 times that of the silica microspheres into a flask, stirring and reacting for 10-12 hours at the temperature of 40-55 ℃ and the rotating speed of 250-300 r/min, filtering to obtain pre-modified silica microsphere blanks, drying the pre-modified silica microsphere blanks for 1-2 hours at the temperature of 60-80 ℃ to obtain pre-modified silica microspheres, and mixing the pre-modified silica microspheres with rubber emulsion according to the mass ratio of 1: 5-1: 6, mixing, standing for 3-6 h at room temperature, and filtering to obtain modified silicon dioxide microspheres; spraying paraffin wax with the mass of 3-4 times that of the modified silicon dioxide microspheres, and freezing the sprayed modified silicon dioxide microspheres at the temperature of 0-8 ℃ for 1-2 h to obtain an additive; weighing the following components in parts by weight: 50-60 parts of epoxy resin, 30-45 parts of sand, 5-10 parts of diluent, 20-28 parts of additive and 5-8 parts of curing agent, mixing the epoxy resin and the sand in a stirrer, adding the additive, the diluent and the curing agent into the stirrer, stirring and mixing for 20-30 min at the temperature of 30-60 ℃ and the rotating speed of 250-380 r/min to obtain a blank, injecting the blank into a mold, curing at the high temperature of 150-180 ℃ for 30-50 min, and demolding to obtain the anti-cracking epoxy resin concrete. The silane coupling agent is any one of a silane coupling agent KH-550, a silane coupling agent KH-560 or a silane coupling agent KH-570. The rubber emulsion is any one of natural rubber emulsion with the solid content of 40-60% or styrene-butadiene rubber emulsion with the solid content of 45-55%. The paraffin is paraffin with 20-32 carbon atoms. The epoxy resin is any one of epoxy resin E-44 or epoxy resin E-51. The sand is 120 meshes. The curing agent is any one of ethylenediamine, diethylamine or triethylene tetramine. The diluent is any one of acetone, cyclohexanone, n-butanol, dibutyl phthalate or dioctyl phthalate. Polyallylamine with the mass of 0.2 time of that of the blank and isocyanate mixture with the mass of 0.2 time of that of the blank can be added into the blank, wherein the isocyanate mixture is prepared by mixing toluene diisocyanate and calcium bicarbonate according to the mass ratio of 3: 1, mixing to obtain an isocyanate mixture.
Mixing cetyl trimethyl ammonium bromide and deionized water according to the mass ratio of 1: 35, mixing the mixture in a beaker, adding urea with the mass of 0.9 time that of the hexadecyl trimethyl ammonium bromide into the beaker, and stirring and mixing the mixture for 40min under the conditions that the temperature is 40 ℃ and the rotating speed is 350r/min to obtain a hexadecyl trimethyl ammonium bromide mixed solution; mixing a mixed solution of hexadecyl trimethyl ammonium bromide and cyclohexane according to a volume ratio of 1.1: 1.0, adding isopropanol with the volume 0.06 times that of the mixed solution of the hexadecyl trimethyl ammonium bromide into the mixed solution of the hexadecyl trimethyl ammonium bromide and the cyclohexane, stirring and mixing for 70min under the conditions that the temperature is 45 ℃ and the rotating speed is 380r/min to obtain a pretreated mixed solution of the hexadecyl trimethyl ammonium bromide, and mixing the pretreated mixed solution of the hexadecyl trimethyl ammonium bromide and ethyl orthosilicate according to the volume ratio of 28: 1, mixing, stirring and reacting for 6 hours at the temperature of 65 ℃ and the rotating speed of 380 ℃, filtering to obtain a filter cake, washing the filter cake for 8 times by using absolute ethyl alcohol, drying for 2 hours at the temperature of 80 ℃, and calcining for 30 minutes at the temperature of 250 ℃ to obtain silicon dioxide microspheres; mixing the silicon dioxide microspheres with a silane coupling agent according to a mass ratio of 4: 1, adding absolute ethyl alcohol with the mass being 12 times that of the silica microspheres into a flask, stirring and reacting for 12 hours at the temperature of 55 ℃ and the rotating speed of 300r/min, filtering to obtain pre-modified silica microsphere blanks, drying the pre-modified silica microsphere blanks for 2 hours at the temperature of 80 ℃ to obtain pre-modified silica microspheres, and mixing the pre-modified silica microspheres with rubber emulsion according to the mass ratio of 1: 6, mixing, standing for 6 hours at room temperature, and filtering to obtain modified silicon dioxide microspheres; spraying paraffin wax with the mass of 4 times that of the modified silicon dioxide microspheres, and freezing the sprayed modified silicon dioxide microspheres at the temperature of 8 ℃ for 2 hours to obtain an additive; weighing the following components in parts by weight: 60 parts of epoxy resin, 45 parts of sand, 10 parts of diluent, 28 parts of additive and 8 parts of curing agent, mixing the epoxy resin and the sand in a stirrer, adding the additive, the diluent and the curing agent into the stirrer, stirring and mixing for 30min at the temperature of 60 ℃ and the rotating speed of 380r/min to obtain a blank, injection molding the blank, curing for 50min at the temperature of 180 ℃, and demolding to obtain the anti-cracking epoxy resin concrete. The silane coupling agent is a silane coupling agent KH-550. The rubber emulsion is natural rubber emulsion with the solid content of 60 percent. The paraffin is paraffin with 20-32 carbon atoms. The epoxy resin is epoxy resin E-44. The sand is 120 meshes. The curing agent is ethylenediamine. The diluent is acetone. Polyallylamine with the mass of 0.2 time of that of the blank and isocyanate mixture with the mass of 0.2 time of that of the blank can be added into the blank, wherein the isocyanate mixture is prepared by mixing toluene diisocyanate and calcium bicarbonate according to the mass ratio of 3: 1, mixing to obtain an isocyanate mixture.
Mixing cetyl trimethyl ammonium bromide and deionized water according to the mass ratio of 1: 35, mixing the mixture in a beaker, adding urea with the mass of 0.9 time that of the hexadecyl trimethyl ammonium bromide into the beaker, and stirring and mixing the mixture for 40min under the conditions that the temperature is 40 ℃ and the rotating speed is 350r/min to obtain a hexadecyl trimethyl ammonium bromide mixed solution; mixing a mixed solution of hexadecyl trimethyl ammonium bromide and tetraethoxysilane according to a volume ratio of 28: 1, mixing, stirring and reacting for 6 hours at the temperature of 65 ℃ and the rotating speed of 380 ℃, filtering to obtain a filter cake, washing the filter cake for 8 times by using absolute ethyl alcohol, drying for 2 hours at the temperature of 80 ℃, and calcining for 30 minutes at the temperature of 250 ℃ to obtain silicon dioxide microspheres; mixing the silicon dioxide microspheres with a silane coupling agent according to a mass ratio of 4: 1, adding absolute ethyl alcohol with the mass being 12 times that of the silica microspheres into a flask, stirring and reacting for 12 hours at the temperature of 55 ℃ and the rotating speed of 300r/min, filtering to obtain pre-modified silica microsphere blanks, drying the pre-modified silica microsphere blanks for 2 hours at the temperature of 80 ℃ to obtain pre-modified silica microspheres, and mixing the pre-modified silica microspheres with rubber emulsion according to the mass ratio of 1: 6, mixing, standing for 6 hours at room temperature, and filtering to obtain modified silicon dioxide microspheres; spraying paraffin wax with the mass of 4 times that of the modified silicon dioxide microspheres, and freezing the sprayed modified silicon dioxide microspheres at the temperature of 8 ℃ for 2 hours to obtain an additive; weighing the following components in parts by weight: 60 parts of epoxy resin, 45 parts of sand, 10 parts of diluent, 28 parts of additive and 8 parts of curing agent, mixing the epoxy resin and the sand in a stirrer, adding the additive, the diluent and the curing agent into the stirrer, stirring and mixing for 30min at the temperature of 60 ℃ and the rotating speed of 380r/min to obtain a blank, injection molding the blank, curing for 50min at the temperature of 180 ℃, and demolding to obtain the anti-cracking epoxy resin concrete. The silane coupling agent is a silane coupling agent KH-550. The rubber emulsion is natural rubber emulsion with the solid content of 60 percent. The paraffin is paraffin with 20-32 carbon atoms. The epoxy resin is epoxy resin E-44. The sand is 120 meshes. The curing agent is ethylenediamine. The diluent is acetone. Polyallylamine with the mass of 0.2 time of that of the blank and isocyanate mixture with the mass of 0.2 time of that of the blank can be added into the blank, wherein the isocyanate mixture is prepared by mixing toluene diisocyanate and calcium bicarbonate according to the mass ratio of 3: 1, mixing to obtain an isocyanate mixture.
Mixing cetyl trimethyl ammonium bromide and deionized water according to the mass ratio of 1: 35, mixing the mixture in a beaker, adding urea with the mass of 0.9 time that of the hexadecyl trimethyl ammonium bromide into the beaker, and stirring and mixing the mixture for 40min under the conditions that the temperature is 40 ℃ and the rotating speed is 350r/min to obtain a hexadecyl trimethyl ammonium bromide mixed solution; mixing a mixed solution of hexadecyl trimethyl ammonium bromide and cyclohexane according to a volume ratio of 1.1: 1.0, adding isopropanol with the volume 0.06 times that of the mixed solution of the hexadecyl trimethyl ammonium bromide into the mixed solution of the hexadecyl trimethyl ammonium bromide and the cyclohexane, stirring and mixing for 70min under the conditions that the temperature is 45 ℃ and the rotating speed is 380r/min to obtain a pretreated mixed solution of the hexadecyl trimethyl ammonium bromide, and mixing the pretreated mixed solution of the hexadecyl trimethyl ammonium bromide and ethyl orthosilicate according to the volume ratio of 28: 1, mixing, stirring and reacting for 6 hours at the temperature of 65 ℃ and the rotating speed of 380 ℃, filtering to obtain a filter cake, washing the filter cake for 8 times by using absolute ethyl alcohol, drying for 2 hours at the temperature of 80 ℃, and calcining for 30 minutes at the temperature of 250 ℃ to obtain silicon dioxide microspheres; mixing the silicon dioxide microspheres with a silane coupling agent according to a mass ratio of 4: 1, mixing the mixture in a flask, adding absolute ethyl alcohol with the mass being 12 times that of the silica microspheres into the flask, stirring and reacting for 12 hours at the temperature of 55 ℃ and the rotating speed of 300r/min, filtering to obtain a pre-modified silica microsphere blank, drying the pre-modified silica microsphere blank for 2 hours at the temperature of 80 ℃ to obtain pre-modified silica microspheres, spraying paraffin with the mass being 4 times that of the pre-modified silica microspheres on the modified silica, and freezing the sprayed pre-modified silica microspheres for 2 hours at the temperature of 8 ℃ to obtain an additive; weighing the following components in parts by weight: 60 parts of epoxy resin, 45 parts of sand, 10 parts of diluent, 28 parts of additive and 8 parts of curing agent, mixing the epoxy resin and the sand in a stirrer, adding the additive, the diluent and the curing agent into the stirrer, stirring and mixing for 30min at the temperature of 60 ℃ and the rotating speed of 380r/min to obtain a blank, injection molding the blank, curing for 50min at the temperature of 180 ℃, and demolding to obtain the anti-cracking epoxy resin concrete. The silane coupling agent is a silane coupling agent KH-550. The paraffin is paraffin with 20-32 carbon atoms. The epoxy resin is epoxy resin E-44. The sand is 120 meshes. The curing agent is ethylenediamine. The diluent is acetone. Polyallylamine with the mass of 0.2 time of that of the blank and isocyanate mixture with the mass of 0.2 time of that of the blank can be added into the blank, wherein the isocyanate mixture is prepared by mixing toluene diisocyanate and calcium bicarbonate according to the mass ratio of 3: 1, mixing to obtain an isocyanate mixture.
Comparative example: cracking-resistant epoxy resin concrete produced by Shanghai concrete Co.
The crack-resistant epoxy resin concrete obtained in examples 1 to 3 and the comparative product were subjected to performance tests by the following specific test methods:
1. breaking strength: the crack-resistant epoxy resin concrete obtained in examples 1 to 3 and the comparative example were prepared into 10cm × 8cm × 5cm test specimens, and the breaking strength was measured;
2. bending strength: the cracking-resistant epoxy resin concrete obtained in examples 1 to 3 and the comparative example were prepared into 120cm × 8cm × 5cm test specimens, and the flexural strength was tested;
specific detection results are shown in table 1:
table 1: sound insulation performance detecting meter
| Detecting content | Example 1 | Example 2 | Example 3 | Comparative example |
| Breaking strength/MPa | 40.6 | 35.7 | 32.6 | 31.8 |
| Flexural strength/MPa | 25.3 | 22.5 | 20.3 | 18.9 |
As can be seen from the detection results in Table 1, the cracking-resistant epoxy resin concrete obtained by the invention has excellent cracking resistance and flexibility.
Claims (9)
1. The preparation method of the anti-cracking epoxy resin concrete is characterized by comprising the following specific preparation steps:
(1) mixing cetyl trimethyl ammonium bromide and deionized water according to the mass ratio of 1: 30-1: 35, adding urea with the mass of 0.8-0.9 times that of the hexadecyl trimethyl ammonium bromide, and stirring and mixing to obtain a hexadecyl trimethyl ammonium bromide mixed solution;
(2) mixing a mixed solution of hexadecyl trimethyl ammonium bromide and cyclohexane according to a volume ratio of 1.2: 1.0-1.1: 1.0, adding isopropanol which is 0.03-0.06 times of the volume of the mixed solution of the hexadecyl trimethyl ammonium bromide, stirring and mixing to obtain a mixed solution of the pretreated hexadecyl trimethyl ammonium bromide, and mixing the mixed solution of the pretreated hexadecyl trimethyl ammonium bromide with ethyl orthosilicate according to the volume ratio of 25: 1-28: 1, mixing, stirring for reaction, filtering, washing, drying and calcining to obtain silicon dioxide microspheres;
(3) mixing the silicon dioxide microspheres with a silane coupling agent according to the mass ratio of 3: 1-4: 1, adding absolute ethyl alcohol with the mass of 10-12 times that of the silica microspheres, stirring for reaction, filtering, and drying to obtain pre-modified silica microspheres, wherein the mass ratio of the pre-modified silica microspheres to the rubber emulsion is 1: 5-1: 6, mixing, standing and filtering to obtain modified silicon dioxide microspheres;
(4) spraying paraffin wax with the mass of 3-4 times that of the modified silicon dioxide microspheres, and freezing to obtain an additive;
(5) weighing the following components in parts by weight: 50-60 parts of epoxy resin, 30-45 parts of sand, 5-10 parts of diluent, 20-28 parts of additive and 5-8 parts of curing agent, mixing the epoxy resin and the sand, adding the additive, the diluent and the curing agent, stirring and mixing to obtain a blank, injection molding the blank, curing at high temperature, and demolding to obtain the anti-cracking epoxy resin concrete.
2. The method for preparing the crack-resistant epoxy resin concrete according to claim 1, wherein the method comprises the following steps: the silane coupling agent in the step (3) is any one of a silane coupling agent KH-550, a silane coupling agent KH-560 or a silane coupling agent KH-570.
3. The method for preparing the crack-resistant epoxy resin concrete according to claim 1, wherein the method comprises the following steps: the rubber emulsion in the step (3) is any one of natural rubber emulsion with the solid content of 40-60% or styrene-butadiene rubber emulsion with the solid content of 45-55%.
4. The method for preparing the crack-resistant epoxy resin concrete according to claim 1, wherein the method comprises the following steps: and (4) the paraffin is the paraffin with the carbon atom number of 20-32.
5. The method for preparing the crack-resistant epoxy resin concrete according to claim 1, wherein the method comprises the following steps: and (5) the epoxy resin is any one of epoxy resin E-44 or epoxy resin E-51.
6. The method for preparing the crack-resistant epoxy resin concrete according to claim 1, wherein the method comprises the following steps: and (5) the sand in the step (5) is 120 meshes of sand.
7. The method for preparing the crack-resistant epoxy resin concrete according to claim 1, wherein the method comprises the following steps: and (5) the curing agent is any one of ethylenediamine, diethylamine or triethylene tetramine.
8. The method for preparing the crack-resistant epoxy resin concrete according to claim 1, wherein the method comprises the following steps: and (5) the diluent is any one of acetone, cyclohexanone, n-butanol, dibutyl phthalate or dioctyl phthalate.
9. The method for preparing the crack-resistant epoxy resin concrete according to claim 1, wherein the method comprises the following steps: polyallylamine which is 0.1-0.2 time of the mass of the blank and an isocyanate mixture which is 0.1-0.2 time of the mass of the blank can be added into the blank in the step (5), wherein the isocyanate mixture is prepared by mixing toluene diisocyanate and calcium bicarbonate according to the mass ratio of 3: 1, mixing to obtain an isocyanate mixture.
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