CN110437735B - Concrete surface waterproof coating and preparation method and application thereof - Google Patents
Concrete surface waterproof coating and preparation method and application thereof Download PDFInfo
- Publication number
- CN110437735B CN110437735B CN201910656829.XA CN201910656829A CN110437735B CN 110437735 B CN110437735 B CN 110437735B CN 201910656829 A CN201910656829 A CN 201910656829A CN 110437735 B CN110437735 B CN 110437735B
- Authority
- CN
- China
- Prior art keywords
- water
- hydrophobic
- emulsion
- hydrophobic emulsion
- pva
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000576 coating method Methods 0.000 title claims abstract description 108
- 239000011248 coating agent Substances 0.000 title claims abstract description 106
- 239000004567 concrete Substances 0.000 title claims abstract description 75
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000000839 emulsion Substances 0.000 claims abstract description 205
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 175
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 84
- 239000000835 fiber Substances 0.000 claims abstract description 69
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 56
- 229920000642 polymer Polymers 0.000 claims abstract description 54
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000008367 deionised water Substances 0.000 claims abstract description 39
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 39
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 66
- -1 polydimethylsiloxane Polymers 0.000 claims description 63
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 61
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 61
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 33
- 229920001843 polymethylhydrosiloxane Polymers 0.000 claims description 29
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 28
- 239000007864 aqueous solution Substances 0.000 claims description 25
- 239000000843 powder Substances 0.000 claims description 19
- 239000000377 silicon dioxide Substances 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000000243 solution Substances 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 5
- 238000004078 waterproofing Methods 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 229920005573 silicon-containing polymer Polymers 0.000 claims 2
- 229920000620 organic polymer Polymers 0.000 abstract description 3
- 238000011031 large-scale manufacturing process Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 29
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 15
- 239000002105 nanoparticle Substances 0.000 description 11
- 230000002829 reductive effect Effects 0.000 description 10
- 229910000077 silane Inorganic materials 0.000 description 10
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 9
- 229910008051 Si-OH Inorganic materials 0.000 description 5
- 229910006358 Si—OH Inorganic materials 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 5
- 125000001165 hydrophobic group Chemical group 0.000 description 4
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 238000007598 dipping method Methods 0.000 description 3
- 238000004945 emulsification Methods 0.000 description 3
- 239000003995 emulsifying agent Substances 0.000 description 3
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Inorganic materials [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 3
- 229910018557 Si O Inorganic materials 0.000 description 2
- 229910002808 Si–O–Si Inorganic materials 0.000 description 2
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000001804 emulsifying effect Effects 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000002086 nanomaterial Substances 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000002562 thickening agent Substances 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000006253 efflorescence Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000003760 magnetic stirring Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- PHQOGHDTIVQXHL-UHFFFAOYSA-N n'-(3-trimethoxysilylpropyl)ethane-1,2-diamine Chemical compound CO[Si](OC)(OC)CCCNCCN PHQOGHDTIVQXHL-UHFFFAOYSA-N 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 206010037844 rash Diseases 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 230000002940 repellent Effects 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 238000001132 ultrasonic dispersion Methods 0.000 description 1
- 238000005303 weighing Methods 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
- C04B41/49—Compounds having one or more carbon-to-metal or carbon-to-silicon linkages ; Organo-clay compounds; Organo-silicates, i.e. ortho- or polysilicic acid esters ; Organo-phosphorus compounds; Organo-inorganic complexes
- C04B41/4905—Compounds having one or more carbon-to-metal or carbon-to-silicon linkages ; Organo-clay compounds; Organo-silicates, i.e. ortho- or polysilicic acid esters ; Organo-phosphorus compounds; Organo-inorganic complexes containing silicon
- C04B41/495—Compounds having one or more carbon-to-metal or carbon-to-silicon linkages ; Organo-clay compounds; Organo-silicates, i.e. ortho- or polysilicic acid esters ; Organo-phosphorus compounds; Organo-inorganic complexes containing silicon applied to the substrate as oligomers or polymers
- C04B41/4961—Polyorganosiloxanes, i.e. polymers with a Si-O-Si-O-chain; "silicones"
- C04B41/4966—Polyorganosiloxanes, i.e. polymers with a Si-O-Si-O-chain; "silicones" containing silicon bound to hydroxy groups, i.e. OH-blocked polysiloxanes
-
- 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5025—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with ceramic materials
- C04B41/5035—Silica
-
- 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5025—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with ceramic materials
- C04B41/5037—Clay, Kaolin
-
- 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
- C04B41/61—Coating or impregnation
- C04B41/62—Coating or impregnation with organic materials
- C04B41/64—Compounds having one or more carbon-to-metal of carbon-to-silicon linkages
-
- 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
- C04B41/61—Coating or impregnation
- C04B41/65—Coating or impregnation with inorganic materials
-
- 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
- C04B41/61—Coating or impregnation
- C04B41/65—Coating or impregnation with inorganic materials
- C04B41/68—Silicic acid; Silicates
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D129/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Coating compositions based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Coating compositions based on derivatives of such polymers
- C09D129/02—Homopolymers or copolymers of unsaturated alcohols
- C09D129/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/16—Fibres; Fibrils
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Structural Engineering (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Applied To Surfaces To Minimize Adherence Of Mist Or Water (AREA)
- Aftertreatments Of Artificial And Natural Stones (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
- Paints Or Removers (AREA)
Abstract
The invention discloses a concrete surface waterproof coating and a preparation method and application thereof. The concrete surface waterproof coating is a hydrophobic emulsion, and the hydrophobic emulsion comprises deionized water, siloxane polymers and water-soluble PVA fibers, wherein: the hydrophobic emulsion comprises the following components in parts by weight: 15-30 parts of water-soluble PVA fiber and 12-60 parts of siloxane polymer; 300 portions of deionized water and 600 portions. When in use, the hydrophobic emulsion is dipped into a mortar test block, and the hydrophobic concrete with a contact angle of 120-145 ℃ and a smooth surface can be obtained; the invention has the advantages that the preparation process of the hydrophobic emulsion is simple, the PVA fiber has better affinity with the surface of the concrete, the hydrophobic emulsion is more favorably combined with the surface of the concrete, and the organic polymer emulsion has good film forming property and certain durability, is easy to operate and is suitable for large-scale production.
Description
The technical field is as follows:
the invention relates to a concrete surface waterproof coating.
The invention also relates to a preparation method and application of the concrete surface waterproof coating.
Background art:
the facing mortar is inorganic mineral facing mortar, is mainly cement-based facing mortar and is used for decorating the surface of a building wall, but is easy to cause efflorescence, peeling and color difference in the application process to influence the attractiveness. The method for inhibiting the saltpetering has the advantages of reducing soluble salt, improving compactness, reducing internal and external moisture and improving maintenance conditions, wherein the traditional method has the method of adding a waterproof additive and a water repellent aiming at waterproof treatment, but has the defects of environmental pollution, easy volatilization and incapability of ensuring long-term effect.
The hydrophobic emulsion surface waterproof coating is mainly prepared by taking silane emulsion as a main material through high-rotation-speed emulsification, a net-shaped cross-linking structure is formed on the surface of concrete, hydrophobic groups are remained on the surface of the concrete to achieve the waterproof effect, but the silane coupling agent has no good compatibility with the interface of the concrete, the hydrophobicity of a coating is easy to damage through weathering, high temperature and mechanical abrasion, alkoxy silane is easy to hydrolyze in water and then is easy to perform condensation reaction, the stability in water is poor, so that the prepared silane emulsion fails without application, proper binding components between the hydrophobic emulsion and the surface of the concrete are very necessary, and polymer organic polymer emulsion is selected to replace the silane emulsion to improve the stability of the hydrophobic emulsion.
Chinese patent CN106220239A reports a preparation method of a high-hydrophobicity silane emulsion concrete waterproofing agent, wherein the high-hydrophobicity emulsion is prepared by firstly emulsifying a silane coupling agent, water and a mixed emulsifier at a high rotating speed, then adding a thickening agent for dispersion at a certain rotating speed, and finally dropwise adding the silane coupling agent and the water for dispersion to obtain the stable high-hydrophobicity silane emulsion waterproofing agent. Although the method can be kept stable and not delaminated at high temperature, the concrete surface is subjected to mechanical abrasion in practical application, and the silane emulsion is easy to hydrolyze and fail, so that the durability is undoubtedly not guaranteed.
Chinese patent CN106277911A reports a preparation method of a silane emulsion building waterproofing agent, which comprises the steps of firstly weighing raw materials, adding a solvent and an emulsifier, adding a catalyst and a thickening agent after dissolving, adding an acrylic resin emulsion after emulsifying, carrying out high-speed emulsification, adjusting the pH value of a system to be 7-9, adding the emulsifier after high-speed emulsification, sterilizing and continuing to emulsify. Although the stable and non-layering silane emulsion waterproof agent is obtained by the method, the process method is complex, the reaction is carried out for 8-10 hours at 60-80 ℃ to obtain reactants when the polymer base material is prepared, the preparation is time-consuming, and the production cost is high.
The invention content is as follows:
the invention solves the problems that the silane emulsion is easy to hydrolyze and lose efficacy, improves the durability of the hydrophobic coating, and provides the preparation method of the concrete surface waterproof coating with simple preparation process.
The technical scheme of the invention is as follows:
a concrete surface waterproof coating is a hydrophobic emulsion, and the hydrophobic emulsion comprises deionized water, siloxane polymers and water-soluble PVA fibers, wherein: the deionized water, the siloxane polymer and the water-soluble PVA fiber comprise the following components in parts by weight:
15-30 parts of water-soluble PVA fiber
Siloxane polymer 12-60
Deionized water 300-.
Further, the siloxane polymer is hydroxy polydimethylsiloxane and/or polymethylhydrosiloxane.
Further, the siloxane polymer is a mixed solution of hydroxy polydimethylsiloxane and polymethylhydrosiloxane; the hydrophobic emulsion comprises the following components in parts by weight:
further, the siloxane polymer is hydroxy polydimethylsiloxane, and the hydrophobic emulsion also comprises a silane coupling agent;
the hydrophobic emulsion comprises the following components in parts by weight:
further, the hydrophobic emulsion also comprises inorganic nanoparticles, wherein the inorganic nanoparticles are nano silicon dioxide powder or metakaolin powder;
when the inorganic nano particles are nano silicon dioxide powder, the hydrophobic emulsion comprises the following components in parts by weight:
when the inorganic nano particles are metakaolin powder, the hydrophobic emulsion comprises the following components in parts by weight:
further, when the inorganic nano particles are nano silicon dioxide powder, the siloxane polymer is a mixed solution of hydroxy polydimethylsiloxane and polymethylhydrosiloxane, and the hydrophobic emulsion comprises the following components in parts by weight:
further, when the inorganic nanoparticles are nano-silica powder, the siloxane polymer is hydroxy polydimethylsiloxane, and the hydrophobic emulsion further comprises a silane coupling agent;
the hydrophobic emulsion comprises the following components in parts by weight:
the invention also aims to provide a preparation method of the concrete surface waterproof coating, which comprises the following steps:
(1) dissolving measured water-soluble PVA fiber in measured deionized water, heating in a 50-60 ℃ water bath for 1-2h to obtain a PVA aqueous solution, and cooling;
(2) slowly adding metered siloxane polymer into PVA aqueous solution, dispersing for 5min at the rotating speed of 5000rpm, adjusting the rotating speed to 6000rpm, and dispersing for 5min to obtain PVA/siloxane polymer emulsion;
the PVA/siloxane polymer emulsion prepared in the step (2) is the concrete surface waterproof coating to be prepared;
the concrete surface waterproof coating comprises the following components in parts by weight:
15-30 parts of water-soluble PVA fiber
Siloxane polymer 12-60
Deionized water 300-.
Further, the PVA/siloxane polymer emulsion prepared in the step (2) needs to be treated in the step (3) to obtain the concrete surface waterproof coating to be prepared; the step (3) is as follows: dissolving metered nano metakaolin powder or metered nano silicon dioxide powder in a metered PVA aqueous solution, ultrasonically dispersing for 1-2h, magnetically stirring for 1h to obtain a uniform solution, slowly adding the uniform solution into the PVA/siloxane polymer emulsion prepared in the step (2), and dispersing for 10min at the rotating speed of 5000rpm to obtain the concrete surface waterproof coating required to be prepared.
The invention also aims to provide an application of the concrete surface waterproof coating, which comprises the following specific steps: soaking the mortar test block in the hydrophobic emulsion for a period of time, and drying at 50 ℃ for 1-2 days to obtain hydrophobic concrete with a contact angle of 120-145 ℃; when the mass of the siloxane polymer in the hydrophobic emulsion accounts for 7.23-10.26%, soaking the mortar test block in the hydrophobic emulsion for 30s-1 min; when the mass percentage of the siloxane polymer in the hydrophobic emulsion is 2.43-3.64%, the mortar test block is immersed in the hydrophobic emulsion for 1-2 h.
The invention has the following advantages:
1) according to the invention, the water-soluble PVA fiber is introduced into the hydrophobic emulsion, and the water-soluble PVA fiber has good affinity with the concrete surface, so that the concrete surface and the hydrophobic emulsion can be better combined, and a stable hydrophobic coating can be obtained.
2) The hydrophobic emulsion prepared by adopting the siloxane polymer, the silane coupling agent, the water-soluble PVA fiber, the inorganic nano particles and the deionized water has simple preparation process and easy control.
3) The invention adopts one or two composite emulsions between the siloxane polymer and the silane coupling agent, overcomes the defect of poor stability of easy hydrolysis and condensation of the silane coupling agent, and has good and stable film-forming property of the polymer organic high molecular emulsion.
Description of the drawings:
FIG. 1 is a graph of surface static water contact angle measurements for the hydrophobic emulsion coating prepared in example 5.
FIG. 2 is a 10 micron SEM of the surface of the hydrophobic emulsion coating prepared in example 5.
Figure 3 is a 2 micron SEM of the surface of the hydrophobic emulsion coating prepared in example 5.
The specific implementation mode is as follows:
the contents of the present invention are described below with reference to some examples, but the technical method of the present invention is not limited to the following embodiments.
Example 1
600g of deionized water, 24g of water-soluble PVA fiber, 49.8g of polymethylhydrosiloxane and 15g of metakaolin powder are weighed respectively;
the concrete surface waterproof coating required by the invention is prepared by the following steps of:
(1) dissolving 24g of 90-degree water-soluble PVA fiber in 550g of deionized water, and heating in a water bath at 100 ℃ for 2h to obtain a PVA aqueous solution; slowly adding 49.8g of polymethylhydrosiloxane into the PVA aqueous solution, dispersing for 5min at the rotating speed of 5000rpm, and then adjusting the rotating speed to 6000rpm for dispersing for 5min to obtain PVA/siloxane polymer emulsion;
(2) dissolving 15g of metakaolin powder in 50g of deionized water, performing ultrasonic dispersion for 1 hour, and performing magnetic stirring for 1 hour to obtain a uniformly dispersed metakaolin solution;
(3) slowly adding the dispersed metakaolin solution into the PVA/siloxane polymer emulsion, and dispersing for 10min at the rotating speed of 5000rpm to obtain the hydrophobic emulsion. The hydrophobic emulsion is the concrete surface waterproof coating required to be prepared by the invention.
Therefore, the concrete surface waterproof coating (hydrophobic emulsion) prepared in this example comprises the following components: 600g of deionized water, 24g of water-soluble PVA fiber, 49.8g of polymethylhydrosiloxane and 15g of metakaolin powder; in the concrete surface waterproof coating, the mass percentage of each solute in the solvent (deionized water) is as follows: 4% of water-soluble PVA fiber, 8.3% of polymethylhydrosiloxane and 2.5% of metakaolin powder.
Preparing a hydrophobic emulsion coating on the surface of a mortar test piece:
the hydrophobic emulsion prepared in the embodiment is soaked in the mortar test piece for 30s-1min, and is dried in a 50-degree oven for 24-48h to obtain a hydrophobic concrete test piece, and after the hydrophobic concrete test piece is dried indoors for 1-2 days, the contact angle of the hydrophobic emulsion coating on the surface of the concrete is 145.74 degrees.
The mortar test piece is prepared by the following steps:
after pouring vibration, drying for 24h at the temperature of 20 ℃ and the relative humidity of 90%, polishing the surface after demolding, drying for 24h in a 50-degree oven, and drying for 48h indoors.
Therefore, the hydrophobic emulsion prepared in this example has the following characteristics:
1. the hydrophobic emulsion is suitable for mortar test pieces (concrete) because the water-soluble PVA fiber is added into the hydrophobic emulsion, and the water-soluble PVA fiber has good affinity with the surface of the concrete, so that the surface of the concrete and the hydrophobic emulsion can be better combined, and a stable hydrophobic coating can be obtained.
2. Has good hydrophobicity because of two aspects: in one aspect, in the hydrophobic emulsion of the embodiment, the water-soluble PVA fibers have good affinity with the surface of concrete, and the polymethylhydrosiloxane is used as a hydrophobic agent due to the hydrophobic group Si-H bond, so that the prepared PVA/siloxane polymer emulsion can form a hierarchical hydrophobic structure on the surface of a mortar test piece (concrete test piece) and has hydrophobicity; on the other hand, the PVA/siloxane polymer emulsion described in this embodiment is formed by mixing the hydrophobic emulsion itself at a high speed to form a shell structure in which the PVA fibers wrap the polymethylhydrosiloxane, and then adding the nano-particles such as metakaolin, so that the nano-particles such as metakaolin are attached to the surface of the shell structure, thereby forming a rough structure required for hydrophobicity, and further improving the hydrophobicity of the PVA/siloxane polymer emulsion. However, since metakaolin is white and off-white, the appearance of a concrete sample as a decorative concrete wall surface or a finishing mortar is impaired by the addition of metakaolin. In addition, the metakaolin can also improve the wear resistance of the coating, because the metakaolin is a submicron or nano particle and can construct a required micro-nano structure.
Example 2
600g of deionized water, 30g of water-soluble PVA fiber and 60g of hydroxy polydimethylsiloxane are weighed.
The concrete surface waterproof coating required by the invention is prepared by the following steps of:
(1) dissolving 30g of 40-degree water-soluble PVA fiber in deionized water, and heating in a 50-degree water bath for 1h to obtain a PVA aqueous solution;
(2) slowly adding 60g of hydroxyl polydimethylsiloxane into the PVA aqueous solution, then dispersing for 5min at the rotating speed of 5000rpm, and then regulating the rotating speed to 6000rpm for dispersing for 5min to obtain the PVA/siloxane polymer emulsion. In this example, the PVA/siloxane polymer emulsion is a hydrophobic emulsion (a waterproof coating for concrete surface) which is a target product to be prepared.
Therefore, the concrete surface waterproof coating (hydrophobic emulsion) prepared in this example comprises the following components: 600g of deionized water, 30g of water-soluble PVA fiber and 60g of hydroxyl polydimethylsiloxane.
The hydrophobic emulsion prepared in this example was used to form a hydrophobic emulsion coating on the surface of a mortar sample by the method described in example 1, and the contact angle of the hydrophobic emulsion coating was found to be 139.93 °, which is lower than the contact angle of the hydrophobic emulsion coating formed on the surface of a mortar sample by the same method as the hydrophobic emulsion prepared in example 1.
In this example, the hydrophobic emulsion (water-proof coating for concrete surface) was a PVA/siloxane polymer emulsion prepared from water-soluble PVA fibers and hydroxy polydimethylsiloxane. Among them, the hydroxypolydimethylsiloxane has an Si-OH bond, can dehydrate with a hydroxyl group on the surface of a mortar (concrete) specimen to form an Si-O bond by condensation, and at the same time, condenses between Si-OH to form a stable Si-O-Si bond, and condenses with a hydroxyl group in water-soluble PVA to form an unstable Si-O-C bond, so that a hydrophobic group covers the surface of the mortar specimen, and therefore, the mortar specimen can form a substrate having hydrophobicity on the surface by impregnating the PVA/siloxane-based polymer emulsion. In addition, the PVA/siloxane polymer emulsion described in this example has a shell structure in which PVA fibers wrap polymethylhydrosiloxane due to the hydrophobic emulsion itself after the PVA and the siloxane polymer are mixed at a high speed, so that the mortar test piece having the hydrophobic emulsion coating described in this example on the surface has good hydrophobicity.
Example 3
600g of deionized water, 30g of water-soluble PVA fiber, 42g of hydroxy polydimethylsiloxane and 18g of silane coupling agent are weighed. The silane coupling agent is KH792 or N- (beta-aminoethyl) -gamma-aminopropyltrimethoxysilane.
This example differs from example 2 in that the amount of hydroxypolydimethylsiloxane was reduced, and the amount of hydroxypolydimethylsiloxane decreased coincidentally with the amount of the newly added silane coupling agent.
The concrete surface waterproof coating required by the invention is prepared by the following steps of:
(1) dissolving 30g of 40-degree water-soluble PVA fiber in deionized water, and heating in a 50-degree water bath for 1h to obtain a PVA aqueous solution;
(2) and slowly adding 42g of hydroxy polydimethylsiloxane and 18g of silane coupling agent into the PVA aqueous solution, dispersing for 5min at the rotating speed of 5000rpm, and then regulating the rotating speed to 6000rpm for dispersing for 5min to obtain the target product, namely the hydrophobic emulsion (the concrete surface waterproof coating).
The hydrophobic emulsion prepared in this example was used to form a hydrophobic emulsion coating on the surface of a mortar sample by the method described in example 1, and the contact angle of the hydrophobic emulsion coating was 126.14 °, which is smaller than the contact angle of the hydrophobic emulsion prepared in example 2 on the surface of a mortar sample by the same method. It is understood that the contact angle of the hydrophobic emulsion coating formed on the surface of the mortar sample after the mortar sample is impregnated with the hydrophobic emulsion formed by the hydroxy polydimethylsiloxane and the water-soluble PVA fibers is larger than the contact angle of the hydrophobic emulsion coating formed on the surface of the mortar sample after the mortar sample is impregnated with the hydrophobic emulsion formed by the hydroxy polydimethylsiloxane, the silane coupling agent and the water-soluble PVA fibers in the same mass ratio.
Example 4
600g of deionized water, 30g of water-soluble PVA fiber, 18g of polymethylhydrosiloxane and 42g of hydroxyl polydimethylsiloxane are weighed.
This example differs from example 2 in that the amount of hydroxypolydimethylsiloxane was reduced, and the amount of hydroxypolydimethylsiloxane decreased coincidentally to the amount of the newly added polymethylhydrosiloxane.
The concrete surface waterproof coating required by the invention is prepared by the following steps of:
(1) dissolving 30g of 40-degree water-soluble PVA fiber in deionized water, and heating in a 50-degree water bath for 1h to obtain a PVA aqueous solution;
(2) and slowly adding 42g of hydroxy polydimethylsiloxane and 18g of polymethylhydrosiloxane into the PVA aqueous solution, dispersing for 5min at the rotating speed of 5000rpm, and then regulating the rotating speed to 6000rpm for dispersing for 5min to obtain the target product, namely the hydrophobic emulsion (the concrete surface waterproof coating).
The hydrophobic emulsion prepared in this example was used to form a hydrophobic emulsion coating on the surface of a mortar sample by the method described in example 1, and the contact angle of the hydrophobic emulsion coating was 120.68 °, which is smaller than the contact angle of the hydrophobic emulsion coating formed on the surface of a mortar sample by the same method as the hydrophobic emulsion prepared in example 2, and which is smaller than the contact angle of the hydrophobic emulsion coating formed on the surface of a mortar sample by the same method as the hydrophobic emulsion prepared in example 3.
Therefore, after the mortar test block is soaked in the hydrophobic emulsion formed by the polymethylhydrosiloxane, the hydroxyl polymethylhydrosiloxane and the water-soluble PVA fiber, the contact angle of the hydrophobic emulsion coating formed on the surface of the mortar test block is smaller than that of the hydrophobic emulsion formed by the hydroxyl polydimethylsiloxane and the water-soluble PVA fiber with the same mass ratio, and after the mortar test block is soaked in the hydrophobic emulsion coating formed on the surface of the mortar test block. Meanwhile, after the mortar test block is soaked in the hydrophobic emulsion formed by the polymethylhydrosiloxane and the water-soluble PVA fiber, the contact angle of a hydrophobic emulsion coating formed on the surface of the mortar test block is smaller than that of the hydrophobic emulsion formed by the silane coupling agent and the water-soluble PVA fiber with the same mass ratio, and after the mortar test block is soaked in the hydrophobic emulsion coating formed on the surface of the mortar test block. However, silane coupling agents have the disadvantages of easy hydrolysis and poor condensation stability, and polymer organic polymer emulsions have good and stable film-forming properties, so that a hydrophobic emulsion formed by only adopting silane coupling agents and water-soluble PVA fibers is not a preferred scheme for preparing the concrete surface waterproof coating.
Example 5
300g of deionized water, 15g of water-soluble PVA fiber and 36g of hydroxyl polydimethylsiloxane were weighed.
This example differs from example 2 in that the amount of deionized water, water-soluble PVA fiber, was reduced in equal proportion. While the amount of hydroxy polydimethylsiloxane was reduced, but to a lesser extent than the amount of deionized water/water-soluble PVA fibers.
The concrete surface waterproof coating required by the invention is prepared by the following steps of:
(1) dissolving 15g of 40-degree water-soluble PVA fiber in 300g of deionized water, and heating in a 50-degree water bath for 1h to obtain a PVA aqueous solution;
(2) slowly adding 36g of hydroxy polydimethylsiloxane into the PVA aqueous solution, dispersing for 5min at the rotating speed of 5000rpm, adjusting the rotating speed to 6000rpm, and dispersing for 5min to obtain the target product, namely the hydrophobic emulsion (the concrete surface waterproof coating).
The hydrophobic emulsion prepared in this example was used to form a hydrophobic emulsion coating on the surface of a mortar test piece by the method described in example 1, and the contact angle of the hydrophobic emulsion coating was 136.78 °, which is slightly smaller than the contact angle of the hydrophobic emulsion prepared in example 2 on the surface of a mortar test piece by the same method. In this example, the mass ratio of the hydroxy polydimethylsiloxane in the prepared waterproof paint for the concrete surface was 10.26%, and the mass ratio of the hydroxy polydimethylsiloxane in the waterproof paint for the concrete surface prepared in example 2 was 8.70%, which was increased to some extent, but the contact angle of the hydrophobic emulsion coating formed on the surface by dipping the mortar sample block of the hydrophobic emulsion corresponding to the hydroxy polydimethylsiloxane was not increased but slightly decreased with respect to the contact angle of the hydrophobic emulsion coating formed on the surface by dipping the hydrophobic emulsion corresponding to the hydroxy polydimethylsiloxane. The reason is that when the mass percentage of the hydroxyl polydimethylsiloxane is 10.26%, the hydroxyl polydimethylsiloxane is saturated in the hydrophobic emulsion coating formed on the surface of the mortar test piece, and the contact angle of the hydrophobic emulsion coating on the surface of the mortar test piece cannot be obviously improved by continuously increasing the mass percentage of the hydroxyl polydimethylsiloxane.
In the drawings, FIG. 1 is a graph of surface static water contact angle measurements of a hydrophobic emulsion coating prepared in this example; FIG. 2 is a 10 micron SEM of the surface of the hydrophobic emulsion coating prepared in this example; FIG. 3 is a 2 micron SEM of the surface of the hydrophobic emulsion coating prepared in this example.
Example 6:
300g of deionized water, 15g of water-soluble PVA fiber, 24g of hydroxy polydimethylsiloxane and 12g of silane coupling agent are weighed.
This example differs from example 5 in that the amount of hydroxypolydimethylsiloxane was reduced, and the amount of hydroxypolydimethylsiloxane decreased coincidentally with the amount of the newly added silane coupling agent.
The concrete surface waterproof coating required by the invention is prepared by the following steps of:
(1) dissolving 15g of 40-degree water-soluble PVA fiber in 300g of deionized water, and heating in a 50-degree water bath for 1h to obtain a PVA aqueous solution;
(2) slowly adding 24g of hydroxy polydimethylsiloxane and 12g of silane coupling agent into the PVA aqueous solution, dispersing for 5min at the rotating speed of 5000rpm, and then adjusting the rotating speed to 6000rpm for dispersing for 5min to obtain the target product, namely the hydrophobic emulsion (the concrete surface waterproof coating).
The hydrophobic emulsion prepared in this example was used to form a hydrophobic emulsion coating on the surface of a mortar sample by the method described in example 1, and the contact angle of the hydrophobic emulsion coating was 126.72 °, which is smaller than the contact angle of the hydrophobic emulsion prepared in example 5 on the surface of a mortar sample by the same method.
Meanwhile, the present embodiment also verifies the following fact: after the mortar test block is soaked in the hydrophobic emulsion formed by the hydroxy polydimethylsiloxane and the water-soluble PVA fiber, the contact angle of a hydrophobic emulsion coating formed on the surface of the mortar test block is larger than that of the hydrophobic emulsion formed by the silane coupling agent, the hydroxy polydimethylsiloxane and the water-soluble PVA fiber with the same mass ratio, and after the mortar test block is soaked in the hydrophobic emulsion coating formed on the surface of the mortar test block.
Example 7
300g of deionized water, 15g of water-soluble PVA fiber, 24g of hydroxy polydimethylsiloxane and 12g of polymethylhydrosiloxane are weighed.
This example differs from example 5 in that the amount of hydroxypolydimethylsiloxane was reduced, and the amount of hydroxypolydimethylsiloxane decreased coincidentally to the amount of the newly added polymethylhydrosiloxane.
The concrete surface waterproof coating required by the invention is prepared by the following steps of:
(1) dissolving 15g of 40-degree water-soluble PVA fiber in 300g of deionized water, and heating in a 50-degree water bath for 1h to obtain a PVA aqueous solution;
(2) slowly adding 24g of hydroxy polydimethylsiloxane and 12g of polymethylhydrosiloxane into the PVA aqueous solution, dispersing for 5min at the rotating speed of 5000rpm, and then adjusting the rotating speed to 6000rpm for dispersing for 5min to obtain the target product, namely the hydrophobic emulsion (the concrete surface waterproof coating).
The hydrophobic emulsion prepared in this example was used to form a hydrophobic emulsion coating on the surface of a mortar sample by the method described in example 1, and the contact angle of the hydrophobic emulsion coating was found to be 126.62 °, which is smaller than the contact angle of the hydrophobic emulsion coating formed on the surface of a mortar sample by the same method as the hydrophobic emulsion prepared in example 5.
In this example, the ratio of the siloxane-based polymer (hydroxypolydimethylsiloxane + polymethylhydrosiloxane) to the hydrophobic emulsion was 10.26% by mass.
From the experimental data disclosed in example 5 and this example, the following conclusions can be drawn: after the mortar test block is soaked in the hydrophobic emulsion formed by the hydroxy polydimethylsiloxane and the water-soluble PVA fibers, the contact angle of a hydrophobic emulsion coating formed on the surface of the mortar test block is larger than that of the hydrophobic emulsion formed by the polymethyl hydrogen siloxane, the hydroxy polydimethylsiloxane and the water-soluble PVA fibers with the same mass ratio, and after the mortar test block is soaked in the hydrophobic emulsion coating formed on the surface of the mortar test block.
By combining the experimental data disclosed in example 5, example 6 and this example, the following conclusions can be drawn: after the mortar test block is soaked in the hydrophobic emulsion formed by the polymethylhydrosiloxane and the water-soluble PVA fiber, the contact angle of a hydrophobic emulsion coating formed on the surface of the mortar test block is smaller than that of the hydrophobic emulsion formed by the silane coupling agent and the water-soluble PVA fiber with the same mass ratio, and after the mortar test block is soaked in the hydrophobic emulsion coating formed on the surface of the mortar test block.
In summary, the component ratios of the hydrophobic emulsions prepared in examples 1 to 7 and the contact angles of the hydrophobic emulsion coatings formed on the surfaces of the mortar test pieces by the same method are shown in table 1 below:
TABLE 1
Table 2 discloses the component ratios of the hydrophobic emulsions prepared in examples 8-10 and the contact angles of the hydrophobic emulsion coatings formed on the surfaces of the mortar test pieces by the same method, and the following will describe examples 8-10 in detail with reference to Table 2, specifically as follows:
TABLE 2
Example 8
300g of deionized water, 15g of water-soluble PVA fiber, 12g of hydroxyl polydimethylsiloxane and 2g of nano silicon dioxide powder are weighed respectively.
In this embodiment, the nano-silica powder may be directly used as a finished product, or may be prepared by the following method:
5ml of tetraethyl orthosilicate (TEOS), 5ml of ammonia water and 100ml of absolute ethyl alcohol were mixed, and the mixture was magnetically stirred for 12 hours, then aged, then centrifuged, and finally dried at 50 ℃ for 12 hours to obtain 2g of nano-silica powder.
The concrete surface waterproof coating required by the invention is prepared by the following steps of:
(1) dissolving 2g of nano silicon dioxide powder in 50g of PVA aqueous solution with mass concentration of 5%, and ultrasonically dispersing for 2h to obtain uniform PVA/SiO2Solution for later use;
(2) dissolving the measured 40-degree water-soluble PVA fiber in the measured deionized water, and heating in a 50-degree water bath for 1h to obtain a PVA aqueous solution with the mass concentration of 5%;
(3) slowly adding metered hydroxy polydimethylsiloxane into the PVA aqueous solution, dispersing for 5min at the rotating speed of 5000rpm, adjusting the rotating speed to 6000rpm, and dispersing for 5min to obtain PVA/siloxane polymer emulsion;
(4) the PVA/SiO prepared in the step (1) is mixed with2Slowly adding the solution into the PVA/siloxane polymer emulsion prepared in the step (3), and dispersing for 10min at the rotating speed of 5000rpm to obtain the hydrophobic emulsion.
Soaking the mortar test piece with the hydrophobic emulsion prepared in the embodiment for 1-2h, drying in a 50-degree oven for 24-48h to obtain a hydrophobic concrete test piece, and drying in a room for 1-2 days to obtain a contact angle of the hydrophobic emulsion coating on the surface of the concrete, which is 137.82 degrees and is equivalent to the contact angle (136.78) of the hydrophobic emulsion coating formed on the surface of the mortar test piece by the hydrophobic emulsion prepared in the embodiment 5; however, in the hydrophobic emulsion prepared in this example, the mass ratio of the hydroxy polydimethylsiloxane is 2.43%, and in the hydrophobic emulsion prepared in example 5, the mass ratio of the hydroxy polydimethylsiloxane is 10.26%, so that in order to form a hydrophobic emulsion coating with good hydrophobicity on the surface of a mortar test piece, the mass ratio of the hydroxy polydimethylsiloxane can be increased before the hydroxy polydimethylsiloxane is saturated, and on the other hand, the mass ratio of the hydroxy polydimethylsiloxane is far less than the saturation, the nano-silica powder with a certain ratio can be added.
In the hydrophobic emulsion described in this example, the water-soluble PVA fiber has good affinity with the concrete surface, the hydroxy polydimethylsiloxane has Si-OH bonds, and can dehydrate and condense with the hydroxyl groups on the surface of the mortar (concrete) specimen to form Si-O bonds, meanwhile, the Si-OH bonds are condensed to form stable Si-O-Si bonds, and the Si-OH bonds condense with the hydroxyl groups in the water-soluble PVA to form unstable Si-O-C bonds, so that the hydrophobic groups cover the surface of the mortar specimen, therefore, the mortar specimen can form a substrate with hydrophobicity on the surface by dipping the PVA/siloxane polymer emulsion. In addition, the PVA/siloxane polymer emulsion described in this embodiment is a shell structure in which PVA fibers wrap hydroxy polydimethylsiloxane is formed by hydrophobic emulsion itself after PVA and siloxane polymers (hydroxy polydimethylsiloxane) are mixed at a high speed, so that a mortar test piece having the hydrophobic emulsion coating described in this embodiment on the surface has good hydrophobicity. And adding nano silicon dioxide powder into the PVA/siloxane polymer emulsion to attach the nano silicon dioxide powder to the surface of the shell structure, so as to form a rough structure required by hydrophobicity, and further improve the hydrophobicity of the PVA/siloxane polymer emulsion.
In addition, the addition of the nano silica powder has a problem that the addition of the nano silica powder affects the beauty (the nano silica powder floats on the surface of a hydrophobic emulsion coating formed on the surface of concrete) of a decorative concrete wall surface or a finishing mortar.
Furthermore, the nano silicon dioxide powder is submicron or nano particles, can construct a required micro-nano structure, and can improve the wear resistance of the coating.
Example 9
300g of deionized water, 15g of water-soluble PVA fiber, 8.01g of hydroxy polydimethylsiloxane, 3.99g of silane coupling agent and 2g of nano silicon dioxide powder are weighed respectively.
It can be seen that the difference between this example and example 8 is that the amount of the hydroxy polydimethylsiloxane was reduced, and the amount of the hydroxy polydimethylsiloxane reduced was just the amount of the newly added silane coupling agent.
In this embodiment, the preparation method of the hydrophobic emulsion is different from that in embodiment 8 only in step (3), and other conditions are the same as those in embodiment 8 and are not described again. The step (3) is specifically as follows:
slowly adding metered hydroxy polydimethylsiloxane and metered silane coupling agent into the PVA aqueous solution, dispersing for 5min at the rotating speed of 5000rpm, and then regulating the rotating speed to the rotating speed of 6000rpm for dispersing for 5min to obtain the PVA/siloxane polymer emulsion.
The hydrophobic emulsion obtained in this example was used to form a hydrophobic emulsion coating on the surface of a mortar sample by the method described in example 8, and the contact angle of the hydrophobic emulsion coating was found to be 127.32 °, which is smaller than the contact angle (137.82 °) of the hydrophobic emulsion obtained in example 5 on the surface of a mortar sample by the same method.
It is understood from the above that even when the hydrophobic emulsion contains nano silica as a component, the contact angle of the hydrophobic emulsion coating formed on the surface of the mortar sample after the mortar sample is impregnated with the hydrophobic emulsion comprising hydroxy polydimethylsiloxane and water-soluble PVA fibers is larger than the contact angle of the hydrophobic emulsion coating formed on the surface of the mortar sample after the mortar sample is impregnated with the hydrophobic emulsion comprising silane coupling agent, hydroxy polydimethylsiloxane and water-soluble PVA fibers in the same mass ratio.
Example 10
300g of deionized water, 15g of water-soluble PVA fiber, 8.01g of hydroxy polydimethylsiloxane, 3.99g of polymethylhydrosiloxane and 2g of nano silicon dioxide powder are weighed respectively
It can be seen that the difference between this example and example 8 is that the amount of hydroxy polydimethylsiloxane was reduced, and the amount of hydroxy polydimethylsiloxane reduced by this amount coincided with the amount of the newly added polymethylhydrosiloxane.
In this embodiment, the preparation method of the hydrophobic emulsion is different from that in embodiment 8 only in step (3), and other conditions are the same as those in embodiment 8 and are not described again. The step (3) is specifically as follows:
slowly adding metered hydroxy polydimethylsiloxane and metered polymethylhydrosiloxane into the PVA aqueous solution, dispersing for 5min at the rotating speed of 5000rpm, and then regulating the rotating speed to the rotating speed of 6000rpm for dispersing for 5min to obtain the PVA/siloxane polymer emulsion.
The hydrophobic emulsion obtained in this example was used to form a hydrophobic emulsion coating on the surface of a mortar sample by the method described in example 8, and the contact angle of the hydrophobic emulsion coating was found to be 145.60 °, which is larger than the contact angle (137.82 °) of the hydrophobic emulsion obtained in example 5 on the surface of a mortar sample by the same method.
It is understood that when the hydrophobic emulsion contains nano-silica powder as a component, the contact angle of the hydrophobic emulsion coating formed on the surface of the mortar sample by impregnating the mortar sample with the hydrophobic emulsion comprising hydroxy polydimethylsiloxane and water-soluble PVA fibers is smaller than the contact angle of the hydrophobic emulsion coating formed on the surface of the mortar sample by impregnating the mortar sample with the hydrophobic emulsion comprising hydroxy polydimethylsiloxane, polymethylhydrosiloxane and water-soluble PVA fibers in the same mass ratio.
And the conclusion made in connection with examples 2-4 and examples 5-7: after the mortar test block is soaked in the hydrophobic emulsion formed by the hydroxy polydimethylsiloxane and the water-soluble PVA fibers, the contact angle of a hydrophobic emulsion coating formed on the surface of the mortar test block is larger than that of the hydrophobic emulsion formed by the polymethylhydrosiloxane and the water-soluble PVA fibers with the same mass ratio, and after the mortar test block is soaked in the hydrophobic emulsion coating formed on the surface of the mortar test block.
Therefore, the following steps are carried out: the nano silicon dioxide powder has a promoting effect on the hydrophobicity of the polymethylhydrosiloxane in the hydrophobic emulsion.
Claims (5)
1. A preparation method of a concrete surface waterproof coating is characterized by comprising the following steps:
(1) dissolving measured water-soluble PVA fiber in measured deionized water, heating in a 50-60 ℃ water bath for 1-2h to obtain a PVA aqueous solution, and cooling;
(2) slowly adding metered siloxane polymer into PVA aqueous solution, dispersing for 5min at the rotating speed of 5000rpm, adjusting the rotating speed to 6000rpm, and dispersing for 5min to obtain PVA/siloxane polymer emulsion; the PVA/siloxane polymer emulsion is in a shell structure of PVA fiber wrapping siloxane polymer;
(3) dissolving metered nano silicon dioxide powder in a metered PVA aqueous solution, ultrasonically dispersing for 1-2h, magnetically stirring for 1h to obtain a uniform solution, slowly adding the uniform solution into the PVA/siloxane polymer emulsion prepared in the step (2), and dispersing for 10min at the rotating speed of 5000rpm to obtain the concrete surface waterproof coating to be prepared;
the concrete surface waterproof coating comprises the following components in parts by weight:
water-soluble PVA fiber 15
Silicone Polymer 12
Deionized water 300
Nano-silica powder 2.
2. A concrete surface waterproof coating material, which is prepared based on the preparation method of the concrete surface waterproof coating material according to claim 1, and is characterized in that: the concrete surface waterproof coating is a hydrophobic emulsion, and the hydrophobic emulsion comprises deionized water, a siloxane polymer, water-soluble PVA fibers and nano silicon dioxide powder, wherein: the deionized water, the siloxane polymer, the water-soluble PVA fiber and the nano silicon dioxide powder comprise the following components in parts by weight:
water-soluble PVA fiber 15
Silicone Polymer 12
Deionized water 300
Nano-silica powder 2.
3. The concrete surface waterproofing coating according to claim 2, characterized in that: the siloxane polymer is a mixed solution of hydroxy polydimethylsiloxane and polymethylhydrosiloxane, and the hydrophobic emulsion comprises the following components in parts by weight:
water-soluble PVA fiber 15
Hydroxy polydimethylsiloxane 8.01
Polymethylhydrosiloxane 3.99
Deionized water 300
Nano-silica powder 2.
4. The concrete surface waterproofing coating according to claim 2, characterized in that: the siloxane polymer is hydroxy polydimethylsiloxane and a silane coupling agent, and the hydrophobic emulsion also comprises the silane coupling agent;
the hydrophobic emulsion comprises the following components in parts by weight:
water-soluble PVA fiber 15
Hydroxy polydimethylsiloxane 8.01
Silane coupling agent 3.99
Deionized water 300
Nano-silica powder 2.
5. The use of the waterproof coating material for concrete surface according to claim 2, characterized in that: and (3) soaking the mortar test block in the hydrophobic emulsion for a period of time, and drying at 50 ℃ for 1-2 days to obtain the hydrophobic concrete with the contact angle of 120-145 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910656829.XA CN110437735B (en) | 2019-07-19 | 2019-07-19 | Concrete surface waterproof coating and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910656829.XA CN110437735B (en) | 2019-07-19 | 2019-07-19 | Concrete surface waterproof coating and preparation method and application thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110437735A CN110437735A (en) | 2019-11-12 |
| CN110437735B true CN110437735B (en) | 2021-07-27 |
Family
ID=68430965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910656829.XA Active CN110437735B (en) | 2019-07-19 | 2019-07-19 | Concrete surface waterproof coating and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110437735B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112552076A (en) * | 2020-12-10 | 2021-03-26 | 中交四航工程研究院有限公司 | Organic silicon super-hydrophobic material and preparation method thereof |
| CN113149710B (en) * | 2021-04-14 | 2022-04-01 | 石家庄市长安育才建材有限公司 | Concrete surface modifier and preparation method thereof |
| CN113248204A (en) * | 2021-05-25 | 2021-08-13 | 东南大学 | Super-hydrophobic coating for cement mortar saltpetering resistance and preparation method thereof |
| CN113979701B (en) * | 2021-12-29 | 2022-03-22 | 北京新桥技术发展有限公司 | Cement-based waterproof coating, raw material composition thereof, and preparation method and application thereof |
| CN116396634B (en) * | 2023-02-22 | 2024-04-02 | 长江水利委员会长江科学院 | Dam concrete surface hydrophobic material and preparation and use methods thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1146099A2 (en) * | 2000-04-13 | 2001-10-17 | JSR Corporation | Coating composition, method for producing the same, cured product and coating film |
| CN105986538A (en) * | 2015-07-13 | 2016-10-05 | 长沙理工大学 | Superhydrophobic and anti-icing composite cement pavement structure and preparation method thereof |
| CN106630740A (en) * | 2016-09-28 | 2017-05-10 | 四会市恒星智能科技有限公司 | Compound waterproofing agent for concrete and preparation method thereof |
| CN106893428A (en) * | 2016-08-23 | 2017-06-27 | 南通久聚高分子科技有限公司 | A kind of high molecular water-proof paint |
| CN108729235A (en) * | 2018-07-05 | 2018-11-02 | 南雄鼎成新材料科技有限公司 | A kind of preparation method and application of single-component low temperature solidification superhydrophobic fabric waterproofing agent |
| CN109844038A (en) * | 2016-10-12 | 2019-06-04 | 瓦克化学股份公司 | Hydrophobic additive |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB201018759D0 (en) * | 2010-11-08 | 2010-12-22 | Dow Corning | Grease resistant coating for fibrous materials |
-
2019
- 2019-07-19 CN CN201910656829.XA patent/CN110437735B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1146099A2 (en) * | 2000-04-13 | 2001-10-17 | JSR Corporation | Coating composition, method for producing the same, cured product and coating film |
| CN105986538A (en) * | 2015-07-13 | 2016-10-05 | 长沙理工大学 | Superhydrophobic and anti-icing composite cement pavement structure and preparation method thereof |
| CN106893428A (en) * | 2016-08-23 | 2017-06-27 | 南通久聚高分子科技有限公司 | A kind of high molecular water-proof paint |
| CN106630740A (en) * | 2016-09-28 | 2017-05-10 | 四会市恒星智能科技有限公司 | Compound waterproofing agent for concrete and preparation method thereof |
| CN109844038A (en) * | 2016-10-12 | 2019-06-04 | 瓦克化学股份公司 | Hydrophobic additive |
| CN108729235A (en) * | 2018-07-05 | 2018-11-02 | 南雄鼎成新材料科技有限公司 | A kind of preparation method and application of single-component low temperature solidification superhydrophobic fabric waterproofing agent |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110437735A (en) | 2019-11-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110437735B (en) | Concrete surface waterproof coating and preparation method and application thereof | |
| CN112961514B (en) | Inorganic silicate as-cast finish concrete coating and preparation method and application thereof | |
| RU2188763C2 (en) | Laminated material | |
| US5110684A (en) | Masonry water repellent | |
| AU709998B2 (en) | Emulsions of organosilicon compounds for imparting water repellency to building materials | |
| CN112079593B (en) | Siloxane modified super-hydrophobic geopolymer anticorrosive material and preparation method thereof | |
| CN107418405A (en) | A kind of aqueous fluorine-containing polyurethane coating and preparation method thereof | |
| CN111518456B (en) | Permeable waterproof alkali-resistant coating and preparation method thereof | |
| WO2009029979A1 (en) | Coating composition and process for the preparation thereof | |
| CN113698850A (en) | Wear-resistant corrosion-resistant super-hydrophobic composite coating and preparation method thereof | |
| CN101422774B (en) | Preparation method of enamel surface coatings with hydrophobic effect | |
| CN105176394A (en) | Organic and inorganic coating material based on sol-gel technique and preparation method thereof | |
| CN107022080A (en) | Preparation method of novel silane composite gel waterproof material | |
| CN113337165A (en) | Preparation method of silane modified water-based acrylic coating | |
| JPH1081555A (en) | Production of hydrophobic additive-containing gypsum mixture and hydrophobic gypsum mixture | |
| Wang et al. | Sandstone protection by using nanocomposite coating of silica | |
| CN113248204A (en) | Super-hydrophobic coating for cement mortar saltpetering resistance and preparation method thereof | |
| CN104449353A (en) | Ceramic paint for decoration walls of subway stations and preparation method of ceramic paint | |
| CN108753100B (en) | Water-based epoxy concrete repairing interface agent and preparation method thereof | |
| Wang et al. | Surface modification with silicon sol on cotton fabrics for water-repellent finishing | |
| CN112608653A (en) | Preparation method of organic silicon polyacrylate-based gypsum composite waterproof agent | |
| Ivanovna et al. | Polysilicate binding for silicate paints | |
| CN115124912B (en) | High-performance inner wall protective wall film and preparation method thereof | |
| CN113563109B (en) | Nano-silyl waterproof emulsion for concrete and preparation method thereof | |
| JPH04106184A (en) | Surface treating agent |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |