CN116102980A - Anionic asphalt waterproof paint and preparation method and application thereof - Google Patents
Anionic asphalt waterproof paint and preparation method and application thereof Download PDFInfo
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- CN116102980A CN116102980A CN202211096201.7A CN202211096201A CN116102980A CN 116102980 A CN116102980 A CN 116102980A CN 202211096201 A CN202211096201 A CN 202211096201A CN 116102980 A CN116102980 A CN 116102980A
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- 239000010426 asphalt Substances 0.000 title claims abstract description 52
- 125000000129 anionic group Chemical group 0.000 title claims abstract description 49
- 238000002360 preparation method Methods 0.000 title abstract description 14
- 238000000576 coating method Methods 0.000 claims abstract description 117
- 239000011248 coating agent Substances 0.000 claims abstract description 106
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000000843 powder Substances 0.000 claims abstract description 41
- 239000000839 emulsion Substances 0.000 claims abstract description 38
- 229920000126 latex Polymers 0.000 claims abstract description 31
- 239000004816 latex Substances 0.000 claims abstract description 31
- 239000002562 thickening agent Substances 0.000 claims abstract description 30
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229920000642 polymer Polymers 0.000 claims abstract description 24
- 239000010445 mica Substances 0.000 claims abstract description 23
- 229910052618 mica group Inorganic materials 0.000 claims abstract description 23
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- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 21
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 21
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
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- 230000003712 anti-aging effect Effects 0.000 claims abstract description 8
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
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- 239000002245 particle Substances 0.000 claims description 36
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- 150000001412 amines Chemical class 0.000 claims description 3
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- 230000003078 antioxidant effect Effects 0.000 claims description 3
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- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 2
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- 239000010452 phosphate Substances 0.000 claims 1
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- 229910052710 silicon Inorganic materials 0.000 claims 1
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- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 2
- UJAWGGOCYUPCPS-UHFFFAOYSA-N 4-(2-phenylpropan-2-yl)-n-[4-(2-phenylpropan-2-yl)phenyl]aniline Chemical compound C=1C=C(NC=2C=CC(=CC=2)C(C)(C)C=2C=CC=CC=2)C=CC=1C(C)(C)C1=CC=CC=C1 UJAWGGOCYUPCPS-UHFFFAOYSA-N 0.000 description 2
- CBTVGIZVANVGBH-UHFFFAOYSA-N aminomethyl propanol Chemical compound CC(C)(N)CO CBTVGIZVANVGBH-UHFFFAOYSA-N 0.000 description 2
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- 239000002174 Styrene-butadiene Substances 0.000 description 1
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- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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- 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
- C09D195/00—Coating compositions based on bituminous materials, e.g. asphalt, tar, pitch
- C09D195/005—Aqueous compositions, e.g. emulsions
-
- 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
- C09D7/43—Thickening agents
-
- 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
- C09D7/43—Thickening agents
- C09D7/44—Combinations of two or more thickening agents
-
- 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
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Abstract
The invention discloses an anionic asphalt waterproof paint and a preparation method and application thereof. The waterproof coating comprises the following components in parts by weight: 5-10 parts of deionized water, 5-15 parts of silica sol, 5-15 parts of quartz powder, 5-15 parts of mica powder, 15-25 parts of acrylic emulsion, 15-25 parts of polymer latex, 35-55 parts of anionic emulsified asphalt, 0.1-0.3 part of preservative, 0.1-0.2 part of anti-aging agent, 0.3-0.5 part of bentonite, 0.3-0.5 part of thickener, 0.05-0.15 part of wetting agent, 0.5-1 part of dispersing agent, 0.1-0.2 part of pH regulator and 0.1-0.3 part of defoaming agent. The invention adopts specific silica sol, mica powder, acrylic emulsion, polymer latex, anionic emulsified asphalt and the like, so that the product has good process and storage stability, strong adhesion performance of a base material, high water impermeability and tensile strength of a coating film, excellent sagging resistance and zero VOC.
Description
Technical Field
The invention relates to the field of waterproof coatings, in particular to an anionic asphalt waterproof coating as well as a preparation method and application thereof.
Background
Commercial emulsified asphalt waterproof paint is generally prepared by adopting cationic emulsified asphalt, neoprene latex or styrene-butadiene latex compounding and other technologies, and has the following main problems: 1. the cationic emulsified asphalt has poor stability, is easy to separate and demulsify, is usually prepared and used at present, and is difficult to store and transport for a long time; 2. the coating property of the latex on the filler is poor, and powder filler can not be added or only a small amount of powder filler can be added; 3. the cationic system can only compound cationic latex, auxiliary agent, neutral or meta-acidic filler and the like, but most of commercial water-based paint materials are materials for anionic systems, such as auxiliary agent, filler, resin and the like. The formula adjustment space is small; 4. the solid content is low, the thixotropy is low, the viscosity is low, thick coating is easy to flow, the construction is difficult to build up the thickness, the elevation construction is difficult to be carried out, the local thickness is uneven, multiple construction is needed, the construction efficiency is low, and the cost is high; 5. the adhesive is high, construction is sticky, and site construction is inconvenient; 6. the adhesive force with the base layer is insufficient, and the base layer is easy to fall off; 7. the emulsified asphalt has poor mechanical stability and more screen residues, so that the fineness of the paint is poor, and the spraying construction is affected; 8. the coating has poor photo-thermal aging resistance; 9. the performance is difficult to meet the requirements of JC/T975-2005 waterproof paint for road and bridge, and particularly the PB II type requirement. At present, a small amount of emulsified asphalt waterproof paint prepared by adopting anionic emulsified asphalt is thickened by adopting a biomass thickener, and the paint has poor permeation type when the viscosity is high, so that the adhesiveness is insufficient. Part of the thickening agent has insufficient thixotropy, is easy to biodegrade, the viscosity is rapidly reduced after degradation, the quality of the paint is affected, and the film-forming auxiliary agent adopted by the system contains VOC components. Thus, it remains a challenge to prepare anionic asphalt waterproofing coatings that have excellent overall properties and are VOC-free.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the anionic asphalt waterproof paint. The paint has the advantages of good process and storage stability, strong adhesion performance of the base material, high water impermeability, high strength of the coating film, excellent sagging resistance and no VOC.
The invention also aims to provide a preparation method and application of the anionic asphalt waterproof paint.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the anionic asphalt waterproof paint comprises the following components in parts by weight: 5-10 parts of deionized water, 5-15 parts of silica sol, 5-15 parts of quartz powder, 5-15 parts of mica powder, 15-25 parts of acrylic emulsion, 15-25 parts of polymer latex, 35-55 parts of anionic emulsified asphalt, 0.1-0.3 part of preservative, 0.1-0.2 part of anti-aging agent, 0.3-0.5 part of bentonite, 0.3-0.5 part of thickener, 0.05-0.15 part of wetting agent, 0.5-1 part of dispersing agent, 0.1-0.2 part of pH regulator and 0.1-0.3 part of defoaming agent.
As a preferable scheme, the pH of the silica sol is 8-10, the particle size is 5-15nm, the sodium oxide content is lower than 0.2%, and the calcium ion stability is good. The calcium ion stability detection standard is to modify partial conditions based on the determination standard of the calcium ion stability in GB/T20623-2006 emulsion for building coating, in particular CaCl 2 The solution is changed into CaCl with mass fraction of 5% 2 The solution was observed for 1h. The silica sol can be LUDOX AS-30 of Graves, TUS-2 of Yuda chemical industry, TUS-30 of Hengxin chemical industry and THI S-S30 of Hengxin chemical industry.
According to the invention, silica sol with pH of 8-10, particle size of 5-15nm, sodium oxide content of less than 0.2% and good calcium ion stability is added into a resin filler system, so that the tensile strength of the waterproof coating, the adhesiveness of the surface of a coating film and the photo-thermal aging resistance of the coating can be effectively improved, the adhesiveness with concrete of inorganic components is stronger than that of high polymer resin, the particle size of the silica sol is 5-15nm, the permeability of the silica sol to a concrete machine surface is very good, and the adhesiveness between the waterproof coating and a concrete pavement can be effectively enhanced. When the pH value of the silica sol is more than 10 or less than 8, the particle size is more than 15nm or less than 5nm, the sodium oxide content is less than 0.2%, the stability and compatibility of the silica sol and a resin filler system are reduced, and the coating is easy to break emulsion or generate impurities. When the calcium ion stability of the silica sol does not meet the standard, the water-proof paint is easy to generate demulsification phenomenon when encountering metal ions, and if the water-proof paint is used on a concrete base surface or a base surface with rainwater, the water-proof paint is easy to generate demulsification phenomenon, so that the film forming effect and the workability of the water-proof paint are affected.
As a preferable scheme, the quartz powder is superfine quartz powder with the particle size of 800-1250 meshes and the oil absorption value of 18-25g/100g and the screen residue of less than or equal to 0.5 percent.
The invention adopts the superfine quartz powder with the particle size of 800-1250 meshes and the oil absorption value of 18-25g/100g, and the screen residue is less than or equal to 0.5 percent, thereby effectively improving the stability, the dispersion effect and the viscosity of the waterproof coating. When the oil absorption value of the quartz powder is more than 25g/100g, the viscosity of the waterproof coating becomes large, the waterproof coating is difficult to disperse, and the amount of filler which can be added in the preparation process is reduced; when the screen residue of the quartz powder is more than 0.5%, the quartz powder particles are uneven and contain more coarse particles, so that the stability of the waterproof coating, the filter screen passing rate and the spraying construction smoothness are affected.
As a preferable scheme, the mica powder is of a sheet structure, has a particle size of 800-1250 meshes and has a diameter-thickness ratio of more than or equal to 75.
The invention selects mica powder with the diameter-thickness ratio not less than 75 and the lamellar structure, can effectively improve the tensile strength of the waterproof coating, prevent water from passing through, strengthen the waterproof performance of the waterproof coating, has the mesh number of 800-1250, can increase the fineness of the waterproof coating, reduce particles, improve the storage stability, and improve the apparent effect of a coating film and the smoothness of spraying construction. When the ratio of diameter to thickness of the mica powder is less than 75 or the mica powder with a platy structure is not adopted, the tensile strength of the coating film is obviously reduced, and the water impermeability is reduced. When the particle size of the quartz powder and the mica powder is 600 meshes or less, the fineness of the coating is increased, the particles are increased, the storage stability is reduced to be within 6 months, and even less than two months are adopted, so that the apparent effect of a coating film and the smoothness of spraying construction are affected.
Preferably, the acrylic emulsion is an acrylic emulsion with a glass transition temperature of-40 to-15 ℃; more preferably, the particle size of the acrylic emulsion is 100-200nm. The acrylic emulsion can be BLJ-5591 of Shanghai Baolijia chemical industry Co., ltd, MT-6699 of Pade Fu industry Co., ltd, and HY-216 of China chemical engineering plant rubber research institute.
According to the invention, the acrylic emulsion with the glass transition temperature of-40 to-15 ℃ is selected, no additional alcohol esters or alcohol ethers are required to be added to assist in film forming, the film forming auxiliary agent containing VOC components is used for realizing zero VOC of the waterproof coating, the acrylic emulsion can provide excellent packing property for the filler, and the tensile strength and the elongation at break of the waterproof coating are improved; the acrylic emulsion with the particle size of 100-200nm is selected, so that the permeability to the base material is good, the adhesion performance with the base material is improved, the particle size distribution is uniform, and the storage stability of the waterproof coating is effectively improved. When the particle diameter of the acrylic emulsion is >200nm, the storage stability of the waterproof coating material and the adhesion property to the substrate are degraded.
As a preferable scheme, the polymer latex is one or two of anionic neoprene latex or natural latex, the solid content is 50-65%, and the mechanical stability is good; more preferably, the particle size of the polymer latex is 100 to 300nm. The mechanical stability is required to meet the requirement of GB/T20623-2006 emulsion for building coating.
The invention selects the polymer latex with good mechanical stability, which is beneficial to the dispersion of the waterproof coating, the particle diameter is similar to that of the acrylic emulsion, the compatibility between the polymer latex and the acrylic emulsion is improved, the stability of the waterproof coating is improved, and the strength and the elongation at break of the coating are improved. When no polymer latex is added, the elongation at break and the strength of the coating are respectively reduced to 640% and 0.65Mpa.
As a preferable scheme, the anionic emulsified asphalt has good mechanical stability and calcium ion stability. The mechanical stability and the calcium ion stability are required to meet the requirements of mechanical stability and calcium ion stability in GB/T20623-2006 emulsion for building coating.
The anionic emulsified asphalt selected by the invention has calcium ion stability and mechanical stability, and can prevent the waterproof paint from being unable to bear shearing force generated by high-speed dispersion in the preparation process, so that the waterproof paint can only be slowly dispersed in the preparation process, thereby having the defects of poor dispersion effect, poor fineness of finished products, poor stability and the like, and effectively avoiding the phenomena of demulsification, flocculation, residue generation and the like in the preparation process. In addition, the anionic emulsified asphalt with calcium ion stability and mechanical stability is selected to reduce the possibility of demulsification of the waterproof coating, improve the dispersion effect of the filler and facilitate the preparation of the waterproof coating finished product with stable process and storage performance.
Preferably, the preservative is one or two of BIT and formaldehyde slow release. The preservative is stable in storage at 30-60 ℃ and pH of 7-10, and has gas phase sterilization capability. The preservative may be Jancare DMH of Germanll 115, jian Kai organism of International Business machines corporation (ISP), SR1138 of Sotel, SKYBIO B20 or SKYBIO B10 of Korean SK chemistry.
Preferably, the antioxidant is one or more of amine antioxidants, phenol antioxidants, heterocyclic antioxidants and phosphite antioxidants. The antioxidant can be CPPD (CPPD) of Shanghai Jiuqing chemical industry Co., ltd, naugard445 of Va et al, or anti-aging agent 2246 of Shandong Boshi.
Preferably, the pH regulator is a small molecular amine compound. The pH regulator can adopt AMP95 of Dow chemical and DMAE of the courtesy chemical.
Preferably, the bentonite is inorganic bentonite, and the 3% colloid viscosity at 20 ℃ is 3000-5500 mpa.s.
Preferably, the thickener is polyurethane or acrylic low shear thickener. The thickener can be a hydrophilic 218 acrylic acid alkali swelling low shear thickener of the Henoch trade and a DSX3290 pseudoplastic association type polyurethane low shear thickener of the Heichuan chemical industry.
The invention adopts 3% inorganic bentonite with colloid viscosity of 3000-5500 mpa.s at 20 ℃, and can effectively control the viscosity of the waterproof paint and improve the sagging property of the waterproof paint by combining the inorganic bentonite with polyurethane or acrylic acid low-shear thickening agent, the thixotropic index can reach 7.8, the plane single construction is more than 2mm, and the elevation single construction is more than 1mm. And the waterproof coating can be ensured to have excellent sagging resistance under lower viscosity, so that convenient spraying performance and single vertical face thick coating performance are ensured. If 3% of the bentonite adopted has a colloid viscosity of less than 3000 mpa.s, for example, when the colloid viscosity is 1000 mpa.s, the thixotropic index is reduced to 3.5, when the colloid viscosity is 2500 mpa.s, the thixotropic index is reduced to 5.2, and when the thickness of a single construction elevation is large, obvious sagging is caused, namely, the thixotropic property of the paint is obviously reduced, and the thickness of the single construction is reduced. Compared with other natural thickeners such as xanthan gum, gelatin and the like, the polyurethane or acrylic thickener has more hydrophobic groups, fewer hydrophilic groups and more excellent water resistance, and the polyurethane or acrylic thickener can effectively avoid the problem caused by the failure of the thickener due to biodegradation.
Preferably, the wetting agent is an anionic sodium salt wetting agent or a nonionic wetting agent. The wetting agent can be Hydroplaat 875 of Haichuan chemical industry, byk-181 of Pick chemical industry, w-511 of the court chemical industry, surfynol-104 of the American air chemical industry, and the like.
Preferably, the dispersing agent is an ammonium salt of polycarboxylic acid or a high molecular copolymer. The Dispersant can be SN-dispersont 5020 of Heichuan chemical industry, TEGO Dispers 740W of Di high chemical industry, DISERBYK-193 of Pick chemical industry and the like.
Preferably, the defoaming agent is a mixture of a silicone defoaming agent and a foam inhibitor. The silicone defoamer may be TEGO 901W, TEGO W of Digao chemical, byk-080A of Pick chemical, PARATROL 810 of Guardian Chemicals, etc.
The invention adds specific types of wetting agent, dispersing agent and defoaming agent into the coating system, and the wetting agent, the dispersing agent and the defoaming agent are matched with each other, so that bubbles generated in the production process of the waterproof coating can be effectively reduced, the compactness of a coating film is improved, and the defect of the coating film is avoided.
The invention also provides a preparation method of the anionic asphalt waterproof paint, which comprises the following steps:
and step 1, mixing and stirring deionized water, a wetting agent, a dispersing agent, a pH regulator, a defoaming agent and silica sol.
And 2, adding bentonite and dispersing.
And step 3, adding mica powder, quartz powder, an anti-aging agent and a preservative, and dispersing.
And step 4, adding the acrylic emulsion, the anionic emulsified asphalt and the polymer latex, and stirring until the mixture is uniform.
And 5, adding a thickening agent, uniformly stirring, and filtering to obtain the anionic asphalt waterproof coating.
Preferably, the stirring in the step 1 is 400-800r/min for 3-5min.
Preferably, the dispersion in the step 2 is 1500-2000r/min for 20-30min.
Preferably, the dispersion in the step 3 is 1500-2000r/min for 20-30min.
Preferably, the rotating speed in the step 4 is 600-1000r/min, and the stirring time is 5-15min.
Preferably, the filtering screen in the step 5 is 80-150 meshes.
The invention also provides application of the anionic asphalt waterproof paint in roads and bridges.
Compared with the prior art, the invention has the following beneficial effects:
1. by introducing silica sol into the acrylic emulsion, the strength of the waterproof coating, the adhesiveness of the surface of a coating film and the photo-thermal aging resistance of the coating are improved, the adhesiveness with concrete of inorganic components is stronger, and meanwhile, the permeability of the waterproof coating to a substrate is improved by utilizing the advantage of good permeability of the silica sol with specific particle size to the concrete machine face, so that the adhesive strength of the waterproof coating and the concrete is improved.
2. The specific mica powder is utilized to improve the strength of the waterproof coating film and the water impermeability. And the number of mica powder is 800-1250, so that the fineness of the waterproof coating is increased, the particles are reduced, the storage stability is improved, and the apparent effect of a coating film and the smoothness of spraying construction are improved.
3. The specific inorganic bentonite is matched with polyurethane or acrylic thickener, so that the viscosity of the waterproof paint is effectively controlled, the thixotropic property of the waterproof paint is improved, and the sagging property of the waterproof paint is improved, thereby preparing the waterproof paint with convenient spraying property, thick coating and vertical face construction.
4. The process stability and the storage stability of the waterproof paint are improved by adopting the specific emulsified asphalt.
5. The acrylic emulsion with specific glass transition temperature is adopted to realize zero VOC of the waterproof coating, and the acrylic emulsion provides excellent packing property for the filler, so that the tensile strength and the elongation at break of the waterproof coating are improved.
6. The discharging viscosity of the waterproof coating is 110-120KU, the viscosity after stabilization is 115-130KU, and the wet film is 2mm and does not sag; the paint is stored for 24 months at room temperature or accelerated for 60 days at 50 ℃, and has good stability, stable viscosity, no sedimentation, no demulsification, no gelation, no coarseness and no mildew.
Drawings
FIG. 1 is a measurement of wet film thickness in a single application of the waterproof coating obtained in example 1.
Fig. 2 is a vertical sagging effect diagram of the single-application wet film of the waterproof coating obtained in example 1.
FIG. 3 is a drawing showing elongation at break test of a coating film of the waterproof paint obtained in example 1 in a tensile testing machine.
FIG. 4 shows the residue of the waterproof paint obtained in example 1 after filtration through a 100 mesh sieve.
FIG. 5 shows the residue of the waterproof paint obtained in comparative example 6 after filtration through a 100 mesh sieve.
FIG. 6 shows the residue of the waterproof coating material obtained in comparative example 8 after filtration through a 100 mesh sieve.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples 1 to 3
Examples 1 to 3 each provide an anionic asphalt waterproof paint, the components of which are shown in table 1, and the preparation method comprises the following steps:
step 1, adding deionized water, a wetting agent, a dispersing agent, a pH regulator, a defoaming agent and silica sol into a stirring kettle in sequence, and stirring for 5min at 600 r/min.
And 2, adding bentonite into the stirring kettle, and dispersing for 30min at a high speed of 2000 r/min.
And step 3, sequentially adding mica powder, quartz powder, an anti-aging agent and a preservative into the stirring kettle, and dispersing for 30min at 1800 r/min.
And step 4, after the rotating speed of the dispersing machine is reduced to 800r/min, sequentially adding the acrylic emulsion, the anionic emulsified asphalt and the polymer latex, and stirring for 15min until the mixture is uniform.
And 5, adding a thickening agent, uniformly stirring, and filtering by a 100-mesh filter screen to obtain the anionic asphalt waterproof coating.
The components of the examples and comparative examples are described in detail as follows:
silica sol: the pH is 9.1, the grain diameter is 5-15nm, the sodium oxide content is lower than 0.2 percent, and the calcium ion stability is good (CaCl in GB/T20623-2006 standard) 2 The mass fraction of (2) is changed to 5%, the observation time is 1 h), LUDOX AS-30, graves;
quartz powder: particle size 1250 mesh, oil absorption value 22g/100g, screen residue 0.1%, and market;
mica powder: a sheet structure with a particle size of 800 meshes and a diameter-thickness ratio of more than or equal to 80, which is commercially available;
acrylic emulsion: the glass transition temperature is-35 ℃, the grain diameter is 100-200nm, BLJ-5591 is used for Shanghai Baolijia chemical industry;
a polymer latex: the anionic neoprene latex has good mechanical stability (meeting the mechanical stability requirement in GB/T20623-2006), the solid content is 58 percent, the particle size is 100-200nm, and the anionic neoprene latex is commercially available;
anionic emulsified asphalt: the 100-mesh filter screen has good mechanical stability and good calcium ion stability (meets the requirements of mechanical stability and calcium ion stability in GB/T20623-2006) through no residue, and is sold in the market;
preservative: BIT, SKYBIO B20, korea SK chemistry;
anti-aging agent: amine antioxidants, naugard445, imperial;
bentonite: inorganic bentonite, 3% colloid viscosity at 20 ℃ is 4500 mpa.s, which is commercially available;
and (3) a thickening agent: polyurethane low shear thickening agent, DSX3290, heichuan chemical industry;
wetting agent: anionic sodium salt dispersant, hydroaat 875, henchuan chemical;
dispersing agent: polycarboxylic acid ammonium salt dispersing agent, SN-dispersont 5020, heichuan chemical industry;
pH regulator: small molecule amine compounds; AMP95, dow chemical.
Defoaming agent: silicone defoamer, TEGO 901W, digao chemical.
Table 1 composition of each of the waterproof coatings of examples 1 to 3 in parts by weight
Comparative examples 1 to 13
Comparative examples 1 to 13 each provided an anionic asphalt waterproof paint, which was substantially the same as the formulation and preparation method of example 1, except that:
comparative example 1 was free of silica sol;
comparative example 2 silica sol pH 12;
comparative example 3 silica sol sodium oxide content was 0.8%;
comparative example 4 the acrylic emulsion has a glass transition temperature of 20 ℃;
comparative example 5 without the addition of acrylic emulsion;
the particle size of the polymer latex of comparative example 6 ranges from 500 to 1000nm;
comparative example 7 does not add a polymer latex;
comparative example 8 commercial anionic emulsified asphalt, calcium ion stability does not meet the requirements of GB/T20623-2006 (asphalt particles are precipitated);
comparative example 9 commercial anionic emulsified asphalt, which has mechanical stability not meeting the requirements of GB/T20623-2006 (asphalt particles are precipitated);
comparative example 10 was free of added mica powder;
comparative example 11 mica powder particle size was 400 mesh;
comparative example 12 bentonite has a 3% colloidal viscosity of 2500 mpa.s at 20 ℃;
the thickener of comparative example 13 was polyurethane high shear thickener WT-105A, the courtesy chemical industry.
Effect example 1
The waterproof coatings obtained in examples 1 to 3 were subjected to performance measurement according to JC/T975-2005 waterproof coating for road and bridge, and the measurement results are shown in Table 2, and the overall performance of example 1 was optimal.
The waterproof coating obtained in example 1 was sprayed onto a substrate at high pressure, and the wet film thickness, sagging effect, dry film thickness, and film tensile properties (elongation at break and tensile strength) of the film were measured for each spray application, and the film tensile properties were measured according to 8.2.2 in GB/T16777-1997. The result of the single-pass wet film thickness is shown in FIG. 1, and the waterproof coating of example 1 has a single-pass wet film thickness of 2200 μm; the sagging effect of the single-time construction wet film vertical surface is shown as figure 2, the single-time construction wet film of the waterproof coating of the embodiment 1 has no sagging phenomenon, which shows that the coating film has good sagging resistance, and the thickness of the dried dry film is 1.1mm, namely the single-time construction thickness of the waterproof coating reaches more than 1 mm; the tensile property detection process of the coating film is shown in figure 3, the tensile strength and the elongation at break are 2.1Mpa and 1550%, and are recorded in table 2, so that the coating film obtained by single construction of the waterproof coating material has excellent elongation at break and tensile strength, and the requirements of the standard of JC/T975-2005 waterproof coating material for roads and bridges are far exceeded. The waterproof coating of examples 2 and 3 also has a wet film thickness of more than 2000 μm in single construction, no sagging phenomenon in vertical wet film, dry film thickness of 1.0mm and 1.1mm after drying, tensile strength of 1.45 and 1.76 respectively, and elongation at break of 1650% and 1260% respectively.
Table 2 the results of testing the properties of the water-repellent coatings of examples 1 to 3
Effect example 2
The waterproof coatings obtained in examples 1 to 3 were subjected to construction stability index measurement, and specific measurement results are shown in table 3. As shown in FIG. 4, the waterproof paint obtained in example 1 was excellent in the passing rate through a 100-mesh sieve, and was free from residues.
TABLE 3 results of measurement of construction stability of Water-repellent coating of examples 1 to 3
Effect example 3 Effect of silica sol and acrylic emulsion on Water-repellent coating Properties
The waterproof coatings obtained in comparative examples 1 to 5 were subjected to performance measurement, and the test standards and methods were the same as those of effect examples 1 and 2, and the measurement indexes and results are shown in Table 4.
Table 4 data for measuring the properties of the waterproof coating materials of example 1 and comparative examples 1 to 5
The waterproof paint performance test results of comparative examples 1 to 3 show that when the system does not adopt silica sol, the bonding strength between the waterproof paint and a cement base surface is 0.73Mpa, the tensile strength is 1.4Mpa, and the heat aging resistant tensile strength retention rate is 76%; when the pH value of the silica sol in the system is 12, the waterproof coating has particles after being stirred in a container, has a small amount of residues when passing through a 100-mesh filter screen, and has sedimentation phenomenon after being stored for 1 month at room temperature; when the sodium oxide content of the silica sol in the system is higher than 0.2%, the water impermeability of the waterproof coating is reduced, and the water seepage phenomenon occurs at 120min under 0.4 MPa. The data show that the unsatisfactory silica sol is easy to cause demulsification of the waterproof coating, generates impurities or has poor water impermeability, so that the silica sol needs to reach the requirements of pH 8-10, particle size 5-15nm, sodium oxide content lower than 0.2% and calcium ion stability to obtain the waterproof coating with better performance.
The test results of the waterproof coatings of comparative examples 4 and 5 show that when the vitrification temperature of the acrylic emulsion in the system is 20 ℃, the low-temperature flexibility of the waterproof coating is obviously reduced, and the crack does not meet the requirements of JC/T975-2005 (waterproof coating for road bridge) PB II standard at-20 ℃; when the system does not use acrylic emulsion, the tensile strength and elongation at break of the waterproof coating are significantly reduced. The data show that the proper glass transition temperature of the acrylic emulsion can not only improve the low-temperature flexibility of the waterproof coating, but also enable the waterproof coating to be formed into a film at a low temperature without adding additional film forming auxiliary agents, so that the product is free of VOC, and the acrylic emulsion can achieve the requirements of the glass transition temperature of-40 to-15 ℃ and the grain diameter of 100-200nm to obtain the waterproof coating with better performance.
Effect example 4 influence of Polymer latex and anionic emulsified asphalt on waterproof coating
The waterproof coatings obtained in comparative examples 6 to 9 were subjected to performance measurement, and the measurement standards and methods were the same as those of effect examples 1 and 2, and the measurement indexes and results are shown in Table 5.
As can be seen from the results of the measurement of the properties of the waterproof coating materials of comparative examples 6 and 7, when the particle size of the polymer latex in the system is in the range of 500 to 1000nm, the waterproof coating material has particles after stirring in a container and residues after passing through a 100-mesh sieve; when the system does not adopt polymer latex, the elongation at break of the waterproof coating is 640%, the tensile strength is 0.65Mpa, the low-temperature flexibility is crack at-15 ℃, and the bonding strength is 0.47Mpa. As shown in FIG. 5, the waterproof paint obtained in comparative example 6 was inferior in the passing rate through a 100-mesh sieve, and there was a small amount of residue on the sieve. The data show that the polymer latex which does not meet the requirements easily causes impurities in the waterproof coating and is unstable in state, so that the particle size of the polymer latex needs to reach 100-300nm which is similar to that of the acrylic emulsion, the compatibility between the polymer latex and the acrylic emulsion is improved, and the stability of the waterproof coating is improved.
The waterproof paint performance measurement results of the comparative examples 8 and 9 show that when the stability of the anionic emulsified asphalt calcium ions in the system is not satisfactory, the waterproof paint has a large amount of residues when passing through a 100-mesh filter screen, is stored at room temperature for 7 days, and is easy to break emulsion in the use process; when the mechanical stability of the anionic emulsified asphalt in the system is not satisfactory, a large amount of residues are produced when the waterproof coating passes through a 100-mesh filter screen, and the waterproof coating is stored at room temperature for 7 days and is easy to break in the preparation process. As shown in FIG. 6, the waterproof coating material obtained in comparative example 8 had extremely poor passing rate through a 100-mesh sieve, and a large amount of residue was present on the sieve. The data show that the mechanical stability and the calcium ion stability of the anionic emulsified asphalt must meet the requirements to obtain the waterproof coating with good long-term storage stability and no demulsification.
Table 5 data for measuring the properties of the waterproof coating materials of example 1 and comparative examples 6 to 9
Effect example 5 Effect of mica powder, bentonite and thickener on Water-repellent paint
The waterproof coatings obtained in comparative examples 10 to 13 were subjected to performance measurement, and the measurement standards and methods were the same as those of effect examples 1 and 2, and the measurement indexes and results are shown in Table 6.
From the test results of the waterproof coatings of comparative examples 10 and 11, when the system does not use mica powder, the tensile strength of the waterproof coating is 1.8MPa; when the mesh number of mica powder in the system is 400 meshes, a large amount of coarse particle residues exist when the waterproof coating passes through a 100-mesh filter screen, and sedimentation phenomenon occurs after the waterproof coating is stored for 2 months at room temperature. The data show that the mica powder which does not meet the requirements easily causes the reduction of the storage stability of the waterproof coating, so that the mica powder needs to reach 800-1250 meshes, and the diameter-thickness ratio is more than or equal to 75 to obtain the waterproof coating with better performance.
TABLE 6 waterproof coating Performance measurement results for example 1 and comparative examples 10 to 13
From the test results of the waterproof paint performance of comparative examples 12 and 13, when the 3% colloid viscosity of bentonite in the system is 2500 mpa.s, the thixotropic index is 5.2, and the obvious sagging phenomenon occurs when the thickness of a single construction elevation is more than 1200 mu m; when the type of the thickener in the system is polyurethane high shear thickener, the thixotropic index is 3.5, the obvious sagging phenomenon exists when the thickness of the single construction elevation is more than 800 mu m, and the sedimentation phenomenon exists when the system is stored for 12 months at room temperature. The data show that the bentonite and the thickener which are not satisfactory easily cause the sagging performance of the waterproof coating to be reduced, and the thickness of single construction is reduced, so that the bentonite added into the waterproof coating system reaches the colloidal viscosity range of 3000-5500 mpa.s at 20 ℃ and the polyurethane or acrylic thickener, thereby being capable of effectively controlling the viscosity of the coating and improving the sagging performance of the coating.
The foregoing embodiments have been provided for the purpose of illustrating the general principles of the present invention, and are not to be construed as limiting the scope of the invention. It should be noted that any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art without departing from the spirit and principles of the present invention are intended to be included in the scope of the present invention.
Claims (10)
1. The anionic asphalt waterproof paint is characterized by comprising the following components in parts by weight: 5-10 parts of deionized water, 5-15 parts of silica sol, 5-15 parts of quartz powder, 5-15 parts of mica powder, 15-25 parts of acrylic emulsion, 15-25 parts of polymer latex, 35-55 parts of anionic emulsified asphalt, 0.1-0.3 part of preservative, 0.1-0.2 part of anti-aging agent, 0.3-0.5 part of bentonite, 0.3-0.5 part of thickener, 0.05-0.15 part of wetting agent, 0.5-1 part of dispersing agent, 0.1-0.2 part of pH regulator and 0.1-0.3 part of defoaming agent.
2. The anionic asphalt waterproof paint as claimed in claim 1, wherein the silica sol has a pH of 8-10, a particle size of 5-15nm, a sodium oxide content of less than 0.2%, and good calcium ion stability.
3. The anionic asphalt waterproofing paint of claim 1, comprising at least one of the following characteristics:
the quartz powder is superfine quartz powder with the particle size of 800-1250 meshes, the oil absorption value of 18-25g/100g and the screen residue of less than or equal to 0.5 percent;
the mica powder has a flaky structure, the particle size is 800-1250 meshes, and the diameter-thickness ratio is more than or equal to 75.
4. The anionic asphalt waterproofing paint of claim 1, comprising at least one of the following characteristics:
the acrylic emulsion is an acrylic emulsion with a glass transition temperature of-40 to-15 ℃;
the polymer latex is one or two of anionic neoprene latex and natural latex, the solid content is 50-65%, and the mechanical stability is good.
5. The anionic asphalt waterproofing paint of claim 4, comprising at least one of the following characteristics:
the particle size of the acrylic emulsion is 100-200nm;
the particle size of the polymer latex is 100-300nm.
6. The anionic asphalt waterproofing paint of claim 1, wherein the anionic emulsified asphalt has good mechanical stability and calcium ion stability.
7. The anionic asphalt waterproofing paint of claim 1, comprising at least one of the following characteristics:
the preservative is one or two of BIT and formaldehyde slow release;
the antioxidant is one or more of amine antioxidants, phenol antioxidants, heterocyclic antioxidants and phosphate antioxidants;
the bentonite is inorganic bentonite, and the 3% colloid viscosity range at 20 ℃ is 3000-5500 mpa.s;
the thickener is polyurethane or acrylic low-shear thickener;
the defoamer is a mixture of high-performance organic silicon defoamer and foam inhibitor.
8. The anionic asphalt waterproofing paint of claim 1, comprising at least one of the following characteristics:
the wetting agent is an anionic sodium salt wetting agent or a nonionic wetting agent;
the pH regulator is a small molecular amine compound;
the dispersing agent is a polycarboxylic acid ammonium salt or a high polymer copolymer.
9. A process for preparing an anionic asphalt waterproofing paint as claimed in any one of claims 1 to 8, characterized by comprising the steps of:
step 1, mixing deionized water, a wetting agent, a dispersing agent, a pH regulator, a defoaming agent and silica sol, and stirring;
step 2, adding bentonite, and dispersing;
step 3, adding mica powder, quartz powder, an anti-aging agent and a preservative, and dispersing;
step 4, adding acrylic emulsion, anionic emulsified asphalt and polymer latex, and stirring until the mixture is uniform;
and 5, adding a thickening agent, uniformly stirring, and filtering to obtain the anionic asphalt waterproof coating.
10. Use of an anionic asphalt waterproofing paint according to any one of claims 1 to 8 for waterproofing roads and bridges.
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