CN109648695B - Silicone rubber template, preparation method thereof and method for preparing super-hydrophobic concrete by using template - Google Patents
Silicone rubber template, preparation method thereof and method for preparing super-hydrophobic concrete by using template Download PDFInfo
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- CN109648695B CN109648695B CN201811452587.4A CN201811452587A CN109648695B CN 109648695 B CN109648695 B CN 109648695B CN 201811452587 A CN201811452587 A CN 201811452587A CN 109648695 B CN109648695 B CN 109648695B
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- 239000004567 concrete Substances 0.000 title claims abstract description 96
- 229920002379 silicone rubber Polymers 0.000 title claims abstract description 83
- 230000003075 superhydrophobic effect Effects 0.000 title claims abstract description 50
- 239000004945 silicone rubber Substances 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title abstract description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 61
- 239000004568 cement Substances 0.000 claims abstract description 58
- 239000011398 Portland cement Substances 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000000741 silica gel Substances 0.000 claims abstract description 32
- 229910002027 silica gel Inorganic materials 0.000 claims abstract description 32
- 239000004576 sand Substances 0.000 claims abstract description 29
- 239000000203 mixture Substances 0.000 claims abstract description 20
- 238000002156 mixing Methods 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 10
- 239000000758 substrate Substances 0.000 claims abstract description 7
- 150000004645 aluminates Chemical class 0.000 claims description 12
- 238000011049 filling Methods 0.000 claims description 10
- 239000002243 precursor Substances 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 239000003431 cross linking reagent Substances 0.000 claims description 4
- 229920000642 polymer Polymers 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 238000005056 compaction Methods 0.000 claims description 2
- 229920001971 elastomer Polymers 0.000 claims description 2
- 239000004615 ingredient Substances 0.000 claims 1
- 238000005096 rolling process Methods 0.000 abstract description 10
- 230000002209 hydrophobic effect Effects 0.000 abstract description 8
- 238000012986 modification Methods 0.000 abstract description 5
- 230000004048 modification Effects 0.000 abstract description 5
- 238000012360 testing method Methods 0.000 description 11
- 239000002994 raw material Substances 0.000 description 9
- 239000008399 tap water Substances 0.000 description 9
- 235000020679 tap water Nutrition 0.000 description 9
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 6
- 229910000077 silane Inorganic materials 0.000 description 6
- 239000000243 solution Substances 0.000 description 4
- XPBBUZJBQWWFFJ-UHFFFAOYSA-N fluorosilane Chemical compound [SiH3]F XPBBUZJBQWWFFJ-UHFFFAOYSA-N 0.000 description 3
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- 244000137852 Petrea volubilis Species 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- IQYKECCCHDLEPX-UHFFFAOYSA-N chloro hypochlorite;magnesium Chemical compound [Mg].ClOCl IQYKECCCHDLEPX-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 230000005660 hydrophilic surface Effects 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 150000004756 silanes Chemical class 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B15/00—General arrangement or layout of plant ; Industrial outlines or plant installations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
- B28B13/02—Feeding the unshaped material to moulds or apparatus for producing shaped articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C41/12—Spreading-out the material on a substrate, e.g. on the surface of a liquid
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Structural Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the technical field of hydrophobic modification of concrete surface, and relates to a silicone rubber template, a preparation method thereof and a method for preparing super-hydrophobic concrete by using the template. The preparation of the silicone rubber template comprises the following steps: (1) pouring the portland cement paste into a silica gel mold, and demolding and maintaining to obtain a portland cement concrete sample; (2) and (3) taking the lower surface of the sample as a substrate, forming a film on the surface of the substrate by using silicon rubber by adopting a solution pouring method, solidifying the film, uncovering the silicon rubber material, and taking the contact surface of the silicon rubber material and the concrete as a silicon rubber template. Preparing super-hydrophobic concrete: and uniformly mixing cement, standard sand and water, pouring the mixture into a silica gel mold, inversely buckling the mixture on the silica gel mold, and curing to obtain the super-hydrophobic concrete sample. Has the advantages that: the contact angle of the contact surface of the super-hydrophobic concrete prepared by the invention and the silicon rubber template to water drops is more than 150 degrees, the rolling angle is less than 10 degrees, and the super-hydrophobic concrete has super-hydrophobicity; the obtained silicon rubber template is suitable for various cement concretes and can be repeatedly used.
Description
Technical Field
The invention belongs to the technical field of hydrophobic modification of concrete surface, and relates to a silicone rubber template, a preparation method thereof and a method for preparing super-hydrophobic concrete by using the template.
Background
The cement and the concrete products thereof are used in great amount in the fields of base material construction (buildings, roads, bridges) and important facility construction (airports, piers, sea-crossing bridges, nuclear power stations and oil wells). The cement concrete material generally has high water absorption and is easily damaged and eroded by water-related factors such as corrosive seawater, lake water, acid rain, freezing and the like, so that the surface of the concrete product is subjected to hydrophobic modification, the water resistance of the concrete product is improved, and the durability of the concrete product is improved. At present, the method for hydrophobic modification of cement concrete is mainly to add silane or fluorosilane into concrete mixture for hydrophobic treatment, and these silane chemical treatment agents can form a super-hydrophobic waterproof protective layer in the cement mixing and curing processes, so as to prevent water from entering the gaps of the cement concrete. Patent document 201611030438X discloses a method for modifying portland cement with silane, fluorosilane, or a fluorine-containing acrylate copolymer, which uses silane or a fluorine-containing substance and is effective only for portland cement. Patent document 2018100461311 discloses a method for preparing a silica gel template with a negative film structure of sand paper by coating silica gel and a silica gel curing agent on the surface of sand paper and drying; and then pouring the magnesium oxychloride cement paste into a set silica gel template mold, and obtaining the magnesium oxychloride cement with the super-hydrophobic surface after molding and maintaining, wherein for the common Portland cement, the surface contact angle obtained by the same method is only 20 degrees, and the surface contact angle is a hydrophilic surface. Patent document No. 2018101395035 first prepares a super-hydrophobic cement fine sand mixture, then puts it into an aqueous solution containing a surfactant, a dispersant and fluorosilane, and mechanically stirs it to form super-hydrophobic cement, and this method also adds a hydrophobic modifier silane to the cement complex, which will reduce the strength of the concrete. In conclusion, the silanes and fluorosilanes used in these processes are expensive and toxic; more importantly, the addition of silane to the mix reduces the compressive strength of the concrete formed, which is detrimental to the use of the concrete. Due to the wide variety and large consumption of cement concrete, the development of a universal, simple and low-cost cement concrete super-hydrophobic surface preparation method is urgently needed in practical application.
Disclosure of Invention
In order to solve the defects of high price of raw materials, poor applicability of a preparation method and poor durability in the prior art, the invention aims to provide a silicone rubber template, a preparation method thereof and a method for preparing super-hydrophobic concrete by using the template, and the technical scheme is realized according to the following steps:
a preparation method of a silicon rubber template comprises the following steps:
(1) mixing portland cement, standard sand and water, and uniformly stirring to form slurry; pouring the slurry into a silica gel mold, demolding after the night, and maintaining to obtain a common portland cement concrete sample, wherein the lower surface of the common portland cement concrete sample is a surface in contact with the silica gel mold;
(2) uniformly mixing all components of the silicon rubber to obtain a silicon rubber precursor solution; horizontally placing the lower surface of the ordinary portland cement concrete and taking the lower surface of the ordinary portland cement concrete as a base plate; and pouring the silicon rubber precursor solution onto the substrate, removing bubbles in vacuum, solidifying, cooling, uncovering the silicon rubber material, and obtaining the silicon rubber template on the surface of the silicon rubber material, which is in contact with the substrate.
Preferably, the mixture ratio of the portland cement, the standard sand and the water in the step (1) is 100:100: 45.
preferably, the rubber mold in the step (1) is a cube mold made of common silica gel purchased from the market, and the size of an internal cavity is 20cm × 20cm × 5 cm; the curing condition is that the curing is carried out in a standard curing box for 28 days; the ordinary portland cement concrete sample is in a shape of a square plate with the size of 20cm multiplied by 1 cm.
Preferably, the silicone rubber in the step (2) is 184 type two-component silicone rubber of Dow Corning company, wherein the two components are an A component polymer and a B component cross-linking agent, and the A component polymer and the B component cross-linking agent are uniformly mixed according to the weight ratio of 10:1 when in use.
Preferably, the curing in the step (2) is specifically performed at room temperature for 24 hours, and then at 80 ℃ for 2 hours.
A method for preparing super-hydrophobic concrete by using a silicon rubber template comprises the following steps:
uniformly mixing cement, standard sand and water, pouring and filling the mixture in a silica gel mold, reversely buckling the silica gel mold on the silica gel template after compaction, and demolding; and curing the demolded concrete sample to obtain the super-hydrophobic concrete sample.
Preferably, the cement is portland cement, aluminate cement or sulphoaluminate cement; wherein the weight ratio of the cement to the standard sand to the water is 100:100: 30-45.
Preferably, the curing is performed in a standard curing box for 28 days, and the inverted silicone mold is kept in contact with the silicone rubber template for 24 hours before demolding.
Has the advantages that:
(1) in the method for preparing the silicon rubber template, common silicate cement and the silicon rubber template are cured together, so that the surface of silicon rubber becomes rough, and when the surface of the silicon rubber and concrete are buckled together, the rough structure is beneficial to coarsening of the cement, and the super-hydrophobicity of the surface of the concrete is increased.
(2) In the method for preparing the super-hydrophobic concrete, after a silicon rubber template and the concrete are buckled together for a period of time, a plurality of low molecular weight hydrophobic components in the silicon rubber are permeated into the surface of the concrete, and the surface of the concrete is subjected to hydrophobic modification, so that the surface of the concrete has hydrophobicity; in addition, the surface of the concrete has a rough microstructure, and the rough structure further strengthens the hydrophobicity of the surface of the concrete, so that the surface of the concrete has super-hydrophobicity after the concrete is cured on the silicon rubber template.
(3) The silicon rubber template prepared by the method has wide applicability, can be applied to common Portland cement, aluminate cement and sulphoaluminate cement, has strong repeatability, and can be repeatedly used for more than 10 times.
(4) The preparation method is completely synchronous with the preparation process of the cement concrete, and the super-hydrophobic surface is formed simultaneously after the concrete is solidified, so that the method has strong practicability.
(5) The silicone rubber template disclosed by the invention is cheap in raw materials, safe and nontoxic, simple in preparation method and good in application prospect.
Drawings
FIG. 1 is a photograph showing a contact angle test of a portland cement concrete sample obtained in example 1 of the present invention;
FIG. 2 is a photograph showing the rolling angle test of a Portland cement concrete sample obtained in example 1 of the present invention.
Detailed Description
The following examples and the accompanying drawings illustrate the present invention in further detail.
Example 1
Firstly, preparing a silicon rubber template: the raw materials of the normal portland cement with the strength grade of 42.5MPa, the standard sand for cement test provided by Xiamen Aisiohu standard sand Co., Ltd and the local tap water are adopted. Mixing the ordinary Portland cement, the standard sand and water according to the proportion of 100 parts by weight of cement, 100 parts by weight of standard sand and 45 parts by weight of water, and uniformly stirring to form slurry; the slurry was then poured into a square mold with internal cavity dimensions of 20cm by 5cm made of normal silica gel and demolded overnight. And curing the demolded cement concrete sample in a standard curing box for 28 days to obtain a square sheet-shaped ordinary portland cement concrete sample with the size of 20cm multiplied by 1cm, wherein the lower surface of the sample is the surface in contact with the silica gel mold. Uniformly mixing a component A and a component B of 184 type silicone rubber of Dow Corning company according to a weight ratio of 10:1 to obtain a precursor solution; horizontally placing the lower surface of the concrete and taking the lower surface of the concrete as a base plate; the precursor solution was poured onto the above substrate, vacuumed to remove bubbles, cured at room temperature for 24 hours, and then cured at 80 ℃ for 2 hours. And after cooling to room temperature, uncovering the silicon rubber material, wherein the contact surface of the silicon rubber material and the concrete is the silicon rubber template.
Then preparing the super-hydrophobic portland cement concrete by using a silicon rubber template: the raw materials of the normal portland cement with the strength grade of 42.5MPa, the standard sand for cement test provided by Xiamen Aisiohu standard sand Co., Ltd and the local tap water are adopted. Uniformly mixing 100 parts by weight of ordinary portland cement concrete as cement, 100 parts by weight of standard sand and 45 parts by weight of water, pouring the mixture into a silica gel mold, filling the mold with the mixture, compacting the mixture, reversely buckling the mold on the prepared silica gel template, and removing the template and demolding after 24 hours; and curing for 28 days in a standard curing box to obtain the super-hydrophobic concrete sample. As shown in fig. 1, the contact angle of the surface of the obtained super-hydrophobic silicate concrete sample contacted with the silicon rubber template to water drops is 153.2 degrees; as shown in FIG. 2, the rolling angle is 7.8 degrees, which shows that the super-hydrophobic concrete prepared by the method has better super-hydrophobicity.
Example 2
Firstly, preparing a silicon rubber template: same as in example 1.
Then preparing the super-hydrophobic aluminate cement concrete by using a silicon rubber template: the cement is prepared from Jianai A700 aluminate cement, standard sand for cement test provided by Xiamen Aisi European Standard Sand Co., Ltd, and local tap water. Uniformly mixing 100 parts by weight of aluminate cement, 100 parts by weight of standard sand and 30 parts by weight of water, pouring the mixture into a silica gel mold, filling the mold and compacting, then reversely buckling the mold on the prepared silica gel template, and removing the template and demolding after 24 hours; and curing for 28 days in a standard curing box to obtain the super-hydrophobic concrete sample, wherein the contact angle of the surface of the super-hydrophobic concrete sample, which is in contact with the silicon rubber template, to water drops is 152.3 degrees, and the rolling angle is 6.7 degrees.
Example 3
Firstly, preparing a silicon rubber template: same as in example 1.
Then preparing the super-hydrophobic sulphoaluminate cement concrete by using a silicon rubber template: as raw materials, ShunAn Double Fast sulphoaluminate cement, standard sand for cement test supplied by Ahsieo Standard Sand Co., Ltd., mansion, and local tap water were used. Uniformly mixing 100 parts by weight of aluminate cement, 100 parts by weight of standard sand and 30 parts by weight of water, pouring the mixture into a silica gel mold, filling the mold and compacting, then reversely buckling the mold on the prepared silica gel template, and removing the template and demolding after 24 hours; and curing for 28 days in a standard curing box to obtain the super-hydrophobic concrete sample, wherein the contact angle of the surface of the super-hydrophobic concrete sample, which is in contact with the silicon rubber template, to water drops is 153.7 degrees, and the rolling angle is 8.6 degrees.
Example 4
The once used silicone rubber template of example 1 was used.
Then preparing the super-hydrophobic portland cement concrete by using a silicon rubber template: the raw materials of the normal portland cement with the strength grade of 42.5MPa, the standard sand for cement test provided by Xiamen Aisiohu standard sand Co., Ltd and the local tap water are adopted. Uniformly mixing 100 parts by weight of ordinary portland cement, 100 parts by weight of standard sand and 45 parts by weight of water, pouring the mixture into a silica gel mold, filling the mold and compacting, reversely buckling the mold on the once-used silicon rubber template, and removing the template and demolding after 24 hours; and curing for 28 days in a standard curing box to obtain the super-hydrophobic concrete sample, wherein the contact angle of the surface of the super-hydrophobic concrete sample, which is in contact with the silicon rubber template, to water drops is 153.1 degrees, and the rolling angle is 8.3 degrees.
Example 5
The twice used silicone rubber template of example 4 was used.
Then preparing the super-hydrophobic portland cement concrete by using a silicon rubber template: the raw materials of the normal portland cement with the strength grade of 42.5MPa, the standard sand for cement test provided by Xiamen Aisiohu standard sand Co., Ltd and the local tap water are adopted. Uniformly mixing 100 parts by weight of ordinary portland cement, 100 parts by weight of standard sand and 45 parts by weight of water, pouring the mixture into a silica gel mold, filling the mold and compacting, reversely buckling the mold on the twice-used silicon rubber template, removing the template after 24 hours, and demolding; and curing for 28 days in a standard curing box to obtain the super-hydrophobic concrete sample, wherein the contact angle of the surface of the super-hydrophobic concrete sample, which is in contact with the silicon rubber template, to water drops is 154.2 degrees, and the rolling angle is 7.5 degrees.
Example 6
The silicone rubber template used three times in example 5 was used.
Then preparing the super-hydrophobic portland cement concrete by using a silicon rubber template: the raw materials of the normal portland cement with the strength grade of 42.5MPa, the standard sand for cement test provided by Xiamen Aisiohu standard sand Co., Ltd and the local tap water are adopted. Uniformly mixing 100 parts by weight of ordinary portland cement, 100 parts by weight of standard sand and 45 parts by weight of water, pouring the mixture into a silica gel mold, filling the mold and compacting, reversely buckling the mold on the silicone rubber template which is used for three times, and removing the template and demolding after 24 hours; and curing for 28 days in a standard curing box to obtain the super-hydrophobic concrete sample, wherein the contact angle of the surface of the super-hydrophobic concrete sample, which is in contact with the silicon rubber template, to water drops is 152.9 degrees, and the rolling angle is 6.4 degrees.
Example 7
The silicone rubber template used four times in example 6 was used.
Then preparing the super-hydrophobic aluminate cement concrete by using a silicon rubber template: the cement is prepared from Jianai A700 aluminate cement, standard sand for cement test provided by Xiamen Aisi European Standard Sand Co., Ltd, and local tap water. Uniformly mixing 100 parts by weight of aluminate cement, 100 parts by weight of standard sand and 30 parts by weight of water, pouring the mixture into a silica gel mold, filling the mold with the mixture, compacting the mixture, reversely buckling the mold on the silicon rubber template which is used for four times, and removing the template and demolding after 24 hours; and curing for 28 days in a standard curing box to obtain the super-hydrophobic concrete sample, wherein the contact angle of the surface of the super-hydrophobic concrete sample, which is in contact with the silicon rubber template, to water drops is 154.3 degrees, and the rolling angle is 6.2 degrees.
Example 8
The silicone rubber template used five times in example 7 was used.
Then preparing the super-hydrophobic sulphoaluminate cement concrete by using a silicon rubber template: as raw materials, ShunAn Double Fast sulphoaluminate cement, standard sand for cement test supplied by Ahsieo Standard Sand Co., Ltd., mansion, and local tap water were used. The aluminate cement concrete consists of 100 weight portions of cement, 100 weight portions of standard sand and 30 weight portions of water. Uniformly mixing the components of the concrete in a certain ratio with water, pouring the mixture into a silica gel mold, filling the mold and compacting, reversely buckling the mold on the five-time used silica gel template, and removing the template and demolding after 24 hours; and curing for 28 days in a standard curing box to obtain the super-hydrophobic concrete sample, wherein the contact angle of the surface of the super-hydrophobic concrete sample, which is in contact with the silicon rubber template, to water drops is 153.7 degrees, and the rolling angle is 8.6 degrees.
From the results of examples 1 to 3, it is understood that the present invention has a wide applicability and can be applied to various cement types such as ordinary portland cement, aluminate cement, and sulfoaluminate cement.
The results of the embodiments 4 to 8 show that the silicone rubber template of the present invention can be reused for multiple times, and experiments prove that the silicone rubber template can be reused for more than 10 times, and can simultaneously maintain the hydrophobicity.
Claims (6)
1. A method for preparing super-hydrophobic concrete by using a silicone rubber template is characterized by comprising the following steps:
(1) mixing portland cement, standard sand and water, and uniformly stirring to form slurry; pouring the slurry into a silica gel mold, demolding after the night, and maintaining to obtain a common portland cement concrete sample, wherein the lower surface of the common portland cement concrete sample is a surface in contact with the silica gel mold;
(2) uniformly mixing all components of the silicon rubber to obtain a silicon rubber precursor solution; horizontally placing the lower surface of the ordinary portland cement concrete and taking the lower surface of the ordinary portland cement concrete as a base plate; pouring the silicon rubber precursor solution on the substrate, removing bubbles in vacuum, solidifying, cooling, uncovering the silicon rubber material, and obtaining a silicon rubber template on the surface of the silicon rubber material, which is in contact with the substrate;
(3) uniformly mixing cement, standard sand and water, pouring and filling the mixture in a silica gel mold, reversely buckling the silica gel mold on the silica gel template after compaction, and demolding; curing the demolded concrete sample to obtain a super-hydrophobic concrete sample;
the silicone rubber mold which needs to be kept in the inverted state before demolding in the step (3) is contacted with the silicone rubber template for 24 hours;
the curing in the step (2) is specifically curing for 24 hours at room temperature and then curing for 2 hours at 80 ℃.
2. The method for preparing the super-hydrophobic concrete by using the silicone rubber template as claimed in claim 1, wherein the ingredient ratio of the portland cement, the standard sand and the water in step (1) is 100:100: 45.
3. the method for preparing the super-hydrophobic concrete by using the silicone rubber template as claimed in claim 1, wherein the rubber mold in the step (1) is a square mold made of common silicone rubber; the curing condition is that the curing is carried out in a standard curing box for 28 days; the ordinary portland cement concrete sample is in a square plate shape.
4. The method for preparing super-hydrophobic concrete using silicone rubber template as claimed in claim 1, wherein said silicone rubber in step (2) is type 184 two-component silicone rubber from Dow Corning company, wherein the two components are A-component polymer and B-component cross-linking agent, and when in use, the A-component polymer and the B-component cross-linking agent are mixed uniformly according to the weight ratio of 10: 1.
5. The method for preparing the super-hydrophobic concrete by using the silicone rubber template as claimed in claim 1, wherein the cement is portland cement, aluminate cement or sulphoaluminate cement; wherein the weight ratio of the cement to the standard sand to the water is 100:100: 30-45.
6. The method for preparing the super-hydrophobic concrete by using the silicone rubber template as claimed in claim 1, wherein the curing is performed in a standard curing box for 28 days.
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| CN101982490A (en) * | 2010-10-29 | 2011-03-02 | 华东理工大学 | Preparation method of superhydrophobic self-cleaning material |
| CN102746580A (en) * | 2012-07-25 | 2012-10-24 | 昌源集团有限公司 | Superhydrophobic polypropylene film and preparation method thereof |
| CN108247820A (en) * | 2018-01-17 | 2018-07-06 | 武汉理工大学 | A kind of magnesia oxychloride cement and its nanometer casting preparation process with super hydrophobic surface |
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| AUPP909499A0 (en) * | 1999-03-10 | 1999-04-01 | Commonwealth Scientific And Industrial Research Organisation | Surface modification of rubber objects |
| FR2855827B1 (en) * | 2003-06-05 | 2005-07-15 | Rhodia Chimie Sa | PROCESS FOR DEPOSITING AND FORMING FILM FROM AQUEOUS FILM-FORMING POLYMER DISPERSION ON A SURFACE BASED ON A COMPOSITION OF MINERAL BINDERS WHICH IS STILL HUMID, AND COMPOSITIONS OF MINERAL BINDERS THUS COATED |
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| CN101982490A (en) * | 2010-10-29 | 2011-03-02 | 华东理工大学 | Preparation method of superhydrophobic self-cleaning material |
| CN102746580A (en) * | 2012-07-25 | 2012-10-24 | 昌源集团有限公司 | Superhydrophobic polypropylene film and preparation method thereof |
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