CN113429886B - Polyurethane modified asphalt, waterborne polyurethane modified asphalt emulsion, waterborne polyurethane modified asphalt waterproof coating and preparation method thereof - Google Patents
Polyurethane modified asphalt, waterborne polyurethane modified asphalt emulsion, waterborne polyurethane modified asphalt waterproof coating and preparation method thereof Download PDFInfo
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- CN113429886B CN113429886B CN202110694295.7A CN202110694295A CN113429886B CN 113429886 B CN113429886 B CN 113429886B CN 202110694295 A CN202110694295 A CN 202110694295A CN 113429886 B CN113429886 B CN 113429886B
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- 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
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/67—Unsaturated compounds having active hydrogen
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- C08G18/6755—Unsaturated carboxylic acids
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Abstract
The invention belongs to the field of modified asphalt, and particularly relates to polyurethane modified asphalt, aqueous polyurethane modified asphalt emulsion, aqueous polyurethane modified asphalt waterproof paint and a preparation method thereof. The polyurethane modified asphalt comprises: polyurethane and base asphalt; the content of aromatic components in the matrix asphalt is more than or equal to 40 percent. According to the invention, the aromatic polyether is reacted with isocyanate and maleic anhydride to obtain the polyurethane prepolymer, the prepolymer has good compatibility with the matrix asphalt with high aromatic content, no additional compatilizer is required to be added in the modification process, and the asphalt is modified by an in-situ polymerization method, so that the problems of low re-granulation modification efficiency and poor compatibility after the polyurethane is prepared are solved. The polymer emulsion is used for improving the adhesion between the coating and a base layer, and the wear resistance of the product is improved by the hard filler. The obtained water-based asphalt coating has good bonding performance with a base layer and a paved asphalt layer, is resistant to high-temperature hot rolling, has water-based environment-friendly material, and can not release volatile organic compounds.
Description
Technical Field
The invention belongs to the field of modified asphalt, and particularly relates to polyurethane modified asphalt, aqueous polyurethane modified asphalt emulsion, aqueous polyurethane modified asphalt waterproof paint and a preparation method thereof.
Background
With the continuous promotion of infrastructure construction in China, city construction develops at a high speed, highway bridge construction in China also steps into a motorway, and the market has increasingly strict requirements on the safety of bridge construction. However, many bridges have defects of water leakage of the bridge deck, corrosion of reinforcing steel bars, concrete expansion, pavement layer peeling and the like due to the failure of waterproof measures. Not only influences the driving safety of the vehicle, but also greatly shortens the service life of the bridge. The traditional water-emulsion asphalt waterproof coating for roads and bridges is prepared by a method of externally doping neoprene latex, and has low product strength and poor capability of resisting external force damage. Particularly, in the construction process, the waterproof layer is easily damaged to cause perforation of the waterproof layer and lose the waterproof function under the thermal action and the extrusion impact action of the asphalt concrete in the paving process of the asphalt concrete. Therefore, the development of the water-emulsion asphalt waterproof coating with high strength and good heat resistance has important significance for the long-term reliability of bridge waterproofing.
The polyurethane modified asphalt material has good high and low temperature resistance, excellent hardness and high cost performance, and can be prepared into the waterborne polyurethane modified asphalt waterproof coating after emulsification, thereby meeting the requirement of cold construction of urban bridges. The Chinese patent application CN 102850506A proposes a method for modifying asphalt by polyurethane, but the method needs to use a pressure reactor to produce under certain pressure, and has higher requirements on the production process. The Chinese patent application CN 107177210A provides a technical scheme of polyurethane modified asphalt, but the method needs to add a compatilizer to ensure the compatibility of polyurethane and asphalt, the production process is complex, and the compatilizer is easy to volatilize to generate organic gas when the asphalt is modified at high temperature, thereby causing harm to health.
Disclosure of Invention
The invention aims to overcome the defects and provide the waterborne polyurethane modified asphalt waterproof coating which can be used for urban bridge waterproof engineering.
In order to achieve the above object, a first aspect of the present invention provides a polyurethane-modified asphalt comprising: polyurethane and base asphalt;
the content of aromatic components in the matrix asphalt is more than or equal to 40 percent.
Preferably, the polyurethane modified asphalt comprises the following components by weight: 10-30 wt% of polyurethane and 70-90 wt% of base asphalt.
The second aspect of the present invention provides the above method for preparing polyurethane modified asphalt, wherein the method comprises:
(1) dehydrating the straight-chain polyol, and then mixing and reacting the dehydrated straight-chain polyol with an isocyanate monomer and maleic anhydride to obtain a prepolymer;
(2) uniformly mixing aromatic polyol and matrix asphalt, and then adding the prepolymer and a catalyst to react to obtain the polyurethane modified asphalt;
preferably, the preparation method of the polyurethane modified asphalt comprises the following steps:
dehydrating 40-60 parts by weight of straight-chain polyol at the temperature of 110-130 ℃ under the vacuum pressure of-0.95 MPa for 2.5-3.5h, cooling to 60-70 ℃, uniformly stirring with 60-100 parts by weight of isocyanate monomer and 20-60 parts by weight of maleic anhydride, and then heating to 80-90 ℃ for reaction for 3-4 h; and cooling to 55-60 ℃ to obtain the prepolymer. By preparing the prepolymer, isocyanate monomers are prevented from volatilizing to cause non-reaction in the process of modifying the asphalt at high temperature; meanwhile, a maleic anhydride monomer is introduced in the process of preparing the prepolymer, so that the compatibility of the prepolymer and the asphalt is improved.
3-8 parts by weight of aromatic polyol and 75-90 parts by weight of matrix asphalt are stirred and dispersed at the temperature of 110-130 ℃ until being uniformly mixed, and then 2-22 parts by weight of prepolymer and 0.01-0.1 part by weight of catalyst are added into a reactor to react at the temperature of 130-150 ℃ for 1.5-2.5h, thus obtaining the polyurethane modified asphalt. The polyurethane is polymerized in situ in the asphalt to form a network structure in the asphalt, so that the performance indexes of the asphalt, such as low-temperature flexibility, strength and the like, are improved.
In the preparation method of the polyurethane modified asphalt, the matrix asphalt can be specifically selected from asphalt with aromatic content of more than or equal to 40%, such as Hualu 90# (with aromatic content of 49.8%), Zhonghai 70# (with aromatic content of 42.8%), Shell 70# (with aromatic content of 41.4%).
Preferably, the linear polyol is selected from at least one of diols and triols having an average molecular weight of 300-2000. The linear polyol is selected to be beneficial in forming a proper network structure in the modified asphalt and improving the low-temperature flexibility and strength of the product.
Preferably, the isocyanate monomer is at least one selected from the group consisting of toluene diisocyanate, diphenylmethane diisocyanate, and isophorone diisocyanate.
Preferably, the aromatic polyol is one selected from the group consisting of polyols having an average molecular weight of 2500-. The aromatic polyol is selected to have the advantages that the compatibility of the aromatic polyol with the asphalt is superior to that of other types of polyols, a stable structure can be formed in the asphalt, and delamination and segregation are not easy to occur.
Preferably, the catalyst is at least one selected from the group consisting of dibutyl tin dilaurate, pyridine, dimethyl cyclohexylamine, and organic bismuth. For example, N' -dimethylpyridine may be used as the pyridine.
The third aspect of the present invention provides an aqueous polyurethane modified asphalt emulsion, comprising:
polyurethane modified asphalt, anionic emulsifier and stabilizer;
the polyurethane modified asphalt is the polyurethane modified asphalt;
the anionic emulsifier is preferably selected from at least one of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, tall oil, sodium naphthenate and sodium abietate;
the stabilizer is preferably at least one selected from the group consisting of hydroxymethyl cellulose, hydroxyethyl cellulose, polyvinyl alcohol and polyacrylamide.
Preferably, in the above aqueous polyurethane-modified asphalt emulsion, the aqueous polyurethane-modified asphalt emulsion comprises:
40-70 parts of polyurethane modified asphalt, 23-59.4 parts of water, 0.5-4.0 parts of anionic emulsifier, 0.1-2.0 parts of stabilizer and 0-1 part of defoaming agent. Under the dispersing and grinding action of a colloid mill, hydrophobic polyurethane modified asphalt is dispersed in water by wrapping of an emulsifier, and a stable suspension liquid is formed by matching with a stabilizer.
The fourth aspect of the present invention provides a preparation method of the above aqueous polyurethane modified asphalt emulsion, including:
dispersing and grinding 40-70 parts by weight of 150-170 ℃ polyurethane modified asphalt and 30-60 parts by weight of 55-65 ℃ soap solution by a colloid mill to obtain the waterborne polyurethane modified asphalt emulsion;
the soap solution comprises: 77-99 parts of water, 0.7-13.3 parts of anionic emulsifier, 0-3.3 parts of defoaming agent and 0.2-6.7 parts of stabilizer.
Preferably, the defoaming agent is at least one selected from the group consisting of a mineral oil defoaming agent, a silicone defoaming agent and a polyether defoaming agent.
The fifth aspect of the present invention provides a water-based polyurethane modified asphalt waterproof coating for roads and bridges, which has high strength and high heat resistance, and comprises:
polymer emulsion, dispersant, waterborne polyurethane modified asphalt emulsion, filler and thickener;
the waterborne polyurethane modified asphalt emulsion is the waterborne polyurethane modified asphalt emulsion;
the polymer emulsion is preferably selected from at least one of pure acrylic emulsion, butylbenzene emulsion, ethylene-vinyl acetate emulsion and styrene-acrylic emulsion with the solid content of 55-70%;
the dispersant is preferably at least one selected from the group consisting of polycarboxylate, sodium lauryl sulfate, triethyl hexyl sodium phosphate and sodium tripolyphosphate;
the filler is preferably selected from at least one of glass beads, fumed silica, talcum powder and quartz powder;
the thickener is preferably at least one selected from the group consisting of hydroxymethyl cellulose, hydroxyethyl cellulose, an acrylic acid-alkali swelling thickener, a nonionic associative thickener, and bentonite.
Preferably, the waterborne polyurethane modified asphalt waterproof coating for roads and bridges comprises:
10-25 parts of polymer emulsion, 0.5-1.5 parts of dispersant, 50-70 parts of waterborne polyurethane modified asphalt emulsion, 10-40 parts of filler and 0.5-5.0 parts of thickener.
The sixth aspect of the present invention provides a preparation method of the above-mentioned aqueous polyurethane modified asphalt waterproof coating for roads and bridges, including:
and uniformly stirring the polymer emulsion, the filler and the dispersant at the rotating speed of 300-1000rpm, then uniformly mixing the polymer emulsion, the filler and the dispersant with the waterborne polyurethane modified asphalt emulsion, and adding the thickening agent to adjust the viscosity to obtain the waterborne polyurethane modified asphalt waterproof coating for roads and bridges.
The invention firstly synthesizes polyurethane prepolymer grafted with maleic anhydride, and mixes the polyurethane prepolymer with polyfunctional polyhydric aromatic alcohol with good compatibility with asphalt, and the mixture is polymerized with modified polyurethane prepolymer in situ in matrix asphalt, because the maleic anhydride can improve the compatibility of the polyurethane prepolymer and the asphalt, polyurethane modified asphalt with good stability is directly obtained after reaction, then the polyurethane modified asphalt is emulsified to obtain high-performance water-based polyurethane modified asphalt emulsion, and the material is mixed with polymer emulsion, filler and the like to prepare the water-based polyurethane modified asphalt waterproof coating for roads and bridges.
Compared with the prior art, the invention has the beneficial effects that:
the polyurethane is adopted to modify the asphalt, so that the hardness and the high-temperature resistance and cracking resistance of the asphalt coating are improved. Aiming at the problem that a compatilizer is required to be added in the common polyurethane modified asphalt to ensure the swelling in the polyurethane asphalt, the aromatic polyol is adopted to react with isocyanate and maleic anhydride to obtain the polyurethane prepolymer, the maleic anhydride can promote the compatibility of the modifier and the asphalt, the prepolymer has good compatibility with the matrix asphalt with high aromatic component content, no additional compatilizer is required to be added in the modification process, and meanwhile, the asphalt is modified by adopting an in-situ polymerization method, so that the problems of low re-granulation modification efficiency and poor compatibility after the polyurethane is prepared are solved. The polymer emulsion is used for improving the adhesion between the coating and a base layer, and the wear resistance of the product is improved by the hard filler. The water-based asphalt coating for roads and bridges is finally obtained by the invention. The material has high cost performance, good bonding performance with a base layer and a paved asphalt layer, high-temperature heat rolling resistance, water-based environment-friendly property and no release of volatile organic compounds.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
In the examples of the present invention, the parts are parts by weight.
Example 1:
40 parts of polyethylene glycol (with average molecular weight of 600) is dehydrated for 3 hours under the vacuum condition of more than 120 ℃ and 0.95MPa, the temperature is reduced to 65 ℃, 60 parts of toluene diisocyanate monomer and 20 parts of maleic anhydride are added, the mixture is stirred for 0.5 hour, then the temperature is increased to 85 ℃, and the reaction is continued for 3 to 4 hours. And cooling to 55 ℃ to obtain the prepolymer. 3 parts of aromatic polyol bisphenol A polyoxyethylene ether (average molecular weight is 2648) and 90 parts of Hualu 90# matrix asphalt (aromatic component is 49.8%) are stirred and dispersed for 2-3 hours at 120 ℃ until the mixture is uniformly mixed, and then 7 parts of prepolymer and 0.02 part of dibutyltin dilaurate are added into a reactor to react for 2 hours at 140 ℃ to obtain the polyurethane modified asphalt A1. The content of polyurethane in the polyurethane modified asphalt A1 was 10%, and the content of matrix asphalt was 90%.
Dispersing and grinding 60 parts of 160 ℃ polyurethane modified asphalt A1 and 40 parts of 60 ℃ soap solution by a colloid mill to obtain aqueous polyurethane modified asphalt emulsion A11. Wherein the soap solution consists of 90 parts of water, 1 part of sodium dodecyl benzene sulfonate, 0.5 part of tall oil, 0.5 part of mineral oil defoamer and 0.5 part of hydroxyethyl cellulose.
Mixing 15 parts of acrylic emulsion (with the solid content of 52 percent), 28 parts of glass beads and 1.2 parts of sodium triethylhexylphosphate, dispersing and stirring uniformly at the rotating speed of 300-1000rpm, adding 57 parts of waterborne polyurethane modified asphalt emulsion A11 into the coating, mixing uniformly, adding 0.8 part of acrylic acid-alkali swelling thickener to adjust the viscosity, and obtaining the waterborne road and bridge asphalt coating A111.
Example 2:
60 parts of polypropylene glycol (with average molecular weight of 1000) is dehydrated for 3 hours under the vacuum condition of more than 120 ℃ and 0.95MPa, the temperature is reduced to 65 ℃, 100 parts of toluene diisocyanate monomer and 20 parts of maleic anhydride are added, the mixture is stirred for 0.5 hour, then the temperature is raised to 85 ℃, and the reaction is continued for 3 to 4 hours. And cooling to 60 ℃ to obtain the prepolymer. 8 parts of aromatic polyester polyol HK1856 (average molecular weight 2500) and 75 parts of Mediterranean No. 70 matrix asphalt (aromatic content 42.8%) were dispersed with stirring at 120 ℃ for 2 to 3 hours until mixed uniformly, and then 17 parts of the prepolymer and 0.02 part of dibutyltin dilaurate were added to a reactor and reacted at 140 ℃ for 2 hours to obtain polyurethane modified asphalt B1. The content of polyurethane in the polyurethane modified asphalt B1 is 25%, and the content of base asphalt is 75%.
And dispersing and grinding 65 parts of 160 ℃ polyurethane modified asphalt B1 and 35 parts of 60 ℃ soap solution by a colloid mill to obtain aqueous polyurethane modified asphalt emulsion B11. Wherein the soap solution consists of 95 parts of water, 2 parts of sodium naphthenate, 1 part of mineral oil defoamer and 0.5 part of polyvinyl alcohol.
After 21 parts of styrene-butadiene emulsion (with the solid content of 49 percent), 18 parts of glass beads and 0.6 part of polycarboxylate are mixed, the mixture is dispersed and stirred uniformly at the rotating speed of 300-1000rpm, then 61 parts of waterborne polyurethane modified asphalt emulsion B11 is added into the coating and mixed uniformly, and 1.2 parts of nonionic associative thickener is added to adjust the viscosity, so as to obtain the waterborne road and bridge asphalt coating B111.
Example 3
60 parts of polytetramethylene glycol (with average molecular weight of 1499) is dehydrated for 3 hours at 120 ℃ under vacuum of more than-0.95 MPa, the temperature is reduced to 65 ℃, 60 parts of diphenylmethane diisocyanate monomer and 60 parts of maleic anhydride are added, the mixture is stirred for 0.5 hour, then the temperature is raised to 85 ℃, and the reaction is continued for 3 to 4 hours. And cooling to 60 ℃ to obtain the prepolymer. 5 parts of aromatic polyol Yingchuang 7111 (average molecular weight is 3500) and 85 parts of Shell 70# base asphalt (aromatic component 41.4%) are stirred and dispersed for 2-3 hours at 120 ℃ until the mixture is uniform, and then 10 parts of prepolymer and 0.04 part of dimethylcyclohexylamine are added into a reactor and reacted for 2 hours at 140 ℃ to obtain the polyurethane modified asphalt C1. The content of polyurethane in the polyurethane modified asphalt C1 is 15%, and the content of matrix asphalt is 85%.
Dispersing and grinding 70 parts of 160 ℃ polyurethane modified asphalt C1 and 30 parts of 60 ℃ soap solution by a colloid mill to obtain the waterborne polyurethane modified asphalt emulsion C11. Wherein the soap solution consists of 95 parts of water, 1.5 parts of sodium dodecyl sulfate, 0.5 part of sodium abietate, 0.2 part of polysiloxane antifoaming agent and 1 part of hydroxymethyl cellulose.
Dispersing and stirring 10 parts of ethylene-vinyl acetate emulsion (with the solid content of 51 percent), 40 parts of fumed silica and 1.5 parts of sodium tripolyphosphate uniformly at the rotating speed of 300-1000rpm, then adding 50 parts of waterborne polyurethane modified asphalt emulsion C11 into the coating, uniformly mixing, and then adding 0.5 part of hydroxymethyl cellulose to adjust the viscosity, thereby obtaining the waterborne road and bridge asphalt coating C111.
Example 4
50 parts of polycaprolactone diol (average molecular weight 2000) is dehydrated for 3 hours at 120 ℃ under vacuum of more than-0.95 MPa, the temperature is reduced to 65 ℃, 70 parts of isophorone diisocyanate and 30 parts of maleic anhydride are stirred for 0.5 hour, then the temperature is raised to 85 ℃, and the reaction is continued for 3 to 4 hours. And cooling to 60 ℃ to obtain the prepolymer. 3 parts of aromatic polyol Yingchuang 7230 (average molecular weight is 3500) and 75 parts of Zhonghai No. 70 matrix asphalt (aromatic component is 42.8%) are stirred and dispersed for 2-3 hours at 120 ℃ until the mixture is uniform, and then 22 parts of prepolymer and 0.08 part of organic bismuth are added into a reactor and reacted for 2 hours at 140 ℃ to obtain polyurethane modified asphalt D1. The content of polyurethane in the polyurethane modified asphalt D1 was 25%, and the content of matrix asphalt was 75%.
Dispersing and grinding 50 parts of polyurethane modified asphalt D1 and 50 parts of soap solution at 50 ℃ by a colloid mill to obtain the waterborne polyurethane modified asphalt emulsion D11. Wherein the soap solution consists of 95 parts of water, 0.5 part of sodium naphthenate, 0.5 part of tall oil and 1 part of polyvinyl alcohol.
After 25 parts of styrene-acrylic emulsion (with the solid content of 56 percent), 10 parts of quartz powder and 0.5 part of sodium dodecyl sulfate are mixed, the mixture is dispersed and stirred uniformly at the rotating speed of 300 plus 1000rpm, then 70 parts of waterborne polyurethane modified asphalt emulsion D11 is added into the coating and mixed uniformly, and then 5 parts of bentonite is added to adjust the viscosity, so as to obtain the waterborne road and bridge asphalt coating D111.
Example 5
Dehydrating 55 parts of polytetramethylene glycol (with average molecular weight of 1800) at 120 ℃ under vacuum of more than 0.95MPa for 3 hours, cooling to 65 ℃, adding 85 parts of diphenylmethane diisocyanate monomer and 25 parts of maleic anhydride, stirring for 0.5 hour, subsequently heating to 85 ℃, and continuing to react for 3-4 hours. And cooling to 60 ℃ to obtain the prepolymer. 10 parts of aromatic polyol Yingchuang 7210 (average molecular weight is 3500) and 70 parts of Zhonghai No. 70 base asphalt (aromatic content is 42.8%), stirring and dispersing for 2-3 hours at 120 ℃ until the mixture is uniformly mixed, then adding 20 parts of prepolymer and 0.04 part of dimethylcyclohexylamine into a reactor, and reacting for 2 hours at 140 ℃ to obtain polyurethane modified asphalt E1. The content of polyurethane in the polyurethane modified asphalt E1 is 30%, and the content of matrix asphalt is 70%.
Dispersing and grinding 70 parts of 160 ℃ polyurethane modified asphalt E1 and 30 parts of 60 ℃ soap solution by a colloid mill to obtain the waterborne polyurethane modified asphalt emulsion E11. Wherein the soap solution consists of 95 parts of water, 1.5 parts of sodium dodecyl sulfate, 0.5 part of sodium abietate, 0.2 part of polysiloxane antifoaming agent and 1 part of hydroxymethyl cellulose.
After 10 parts of styrene-acrylic emulsion (with a solid content of 54 percent), 40 parts of fumed silica and 1.5 parts of sodium tripolyphosphate are mixed, the mixture is dispersed and stirred uniformly at the rotating speed of 300-1000rpm, then 50 parts of waterborne polyurethane modified asphalt emulsion C11 is added into the coating and mixed uniformly, and then 0.5 part of hydroxymethyl cellulose is added to adjust the viscosity, so that the waterborne road and bridge asphalt coating E111 is obtained.
Comparative example 1
60 parts of Hualu 90# base asphalt (49.8% of aroma) is heated to 150 ℃ and dispersed and ground with 40 parts of soap solution at 50 ℃ by a colloid mill to obtain water-based asphalt F11. Wherein the soap solution consists of 90 parts of water, 1 part of sodium dodecyl benzene sulfonate, 0.5 part of tall oil, 0.5 part of mineral oil and 0.5 part of hydroxyethyl cellulose.
Mixing 15 parts of pure acrylic emulsion, 28 parts of glass beads and 1.2 parts of triethyl hexyl sodium phosphate, dispersing and stirring uniformly at the rotating speed of 1000rpm at 300-.
Comparative example 2
After 90 parts of Baolai 90# base asphalt (35.7% of aromatic component) was heated to 160 ℃, 10 parts of commercially available one-component polyurethane G was added to the molten hot asphalt, and stirred and dispersed for 2 hours to obtain polyurethane modified asphalt. Dispersing and grinding 60 parts of polyurethane modified asphalt and 40 parts of soap solution at 50 ℃ by a colloid mill to obtain the waterborne polyurethane modified asphalt G11. Wherein the soap solution consists of 90 parts of water, 1 part of sodium dodecyl benzene sulfonate, 0.5 part of tall oil, 0.5 part of mineral oil and 0.5 part of hydroxyethyl cellulose.
Mixing 15 parts of pure acrylic emulsion, 28 parts of glass beads and 1.2 parts of triethyl hexyl sodium phosphate, dispersing and stirring uniformly at the rotating speed of 1000rpm at 300-.
Comparative example 3
60 parts of base asphalt No. Baolai 90 (35.7% in terms of aroma) at 160 ℃ and 40 parts of soap solution at 60 ℃ are subjected to dispersion grinding by a colloid mill to obtain water-based asphalt H11. Wherein the soap solution consists of 90 parts of water, 1 part of sodium dodecyl benzene sulfonate, 0.5 part of tall oil, 0.5 part of mineral oil and 0.5 part of hydroxyethyl cellulose.
After 15 parts of pure acrylic emulsion, 28 parts of glass beads and 1.2 parts of sodium triethylhexyl phosphate are mixed, the mixture is dispersed and stirred uniformly at the rotating speed of 300-1000rpm, 50 parts of water-based asphalt H11 and 7 parts of single-component polyurethane are added into the coating and dispersed at the rotating speed of 300-1000rpm, and a sample is difficult to disperse and agglomerate.
Comparative example 4
60 parts of Baolai 90# base asphalt (35.7% in terms of aroma) is heated to 150 ℃ and then dispersed and ground with 40 parts of soap solution at 50 ℃ by a colloid mill to obtain water-based asphalt I11. Wherein the soap solution consists of 90 parts of water, a mixture of 1 part of sodium dodecyl benzene sulfonate and 0.5 part of tall oil, 0.5 part of mineral oil and 0.5 part of hydroxyethyl cellulose.
Mixing 15 parts of aqueous polyurethane emulsion, 28 parts of glass beads and 1.2 parts of triethyl hexyl sodium phosphate, dispersing and stirring uniformly at the rotating speed of 300-1000rpm, adding 57 parts of aqueous asphalt I11 into the coating, uniformly mixing, adding 0.8 part of acrylic acid alkali swelling thickener to adjust viscosity, and obtaining the aqueous road and bridge asphalt coating I111.
The coatings prepared in the examples and comparative examples were tested according to the test method and standard for aqueous asphalt coatings in JC/T975-2005 waterproof coating for roads and bridges, and the results are shown in Table 1.
TABLE 1
As can be seen from comparative example 1, the water-based asphalt coating which is not modified by polyurethane has low tensile strength, low bonding strength with a concrete base and poor heat resistance; as can be seen from the comparative example 2, the common single-component polyurethane modified water-based asphalt coating has poor compatibility and poor modification effect of the polyurethane prepared into the prepolymer, so that the stability of the coating is poor, and the coating is subjected to phase separation after being stored for one day and cannot be prepared into a uniform coating for testing; as can be seen from comparative example 3, a uniform coating product could not be obtained by directly mixing the polyurethane with the aqueous asphalt emulsion; as can be seen from comparative example 4, the product prepared by mixing the polyurethane emulsion and the asphalt emulsion has no good performance compared with the product prepared by emulsifying the polyurethane modified asphalt.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (7)
1. A polyurethane-modified asphalt, comprising: polyurethane and base asphalt;
the polyurethane modified asphalt comprises: 10-30% of polyurethane and 70-90% of matrix asphalt;
the content of aromatic components in the matrix asphalt is more than or equal to 40 percent;
the preparation method of the polyurethane modified asphalt comprises the following steps:
dehydrating 40-60 parts by weight of straight-chain polyol at the temperature of 110-130 ℃ under the vacuum pressure of-0.95 MPa for 2.5-3.5h, cooling to 60-70 ℃, uniformly stirring with 60-100 parts by weight of isocyanate monomer and 20-60 parts by weight of maleic anhydride, and then heating to 80-90 ℃ for reaction for 3-4 h; cooling to 55-60 ℃ to obtain a prepolymer;
3-8 parts by weight of aromatic polyol and 75-90 parts by weight of matrix asphalt are stirred and dispersed at the temperature of 110-130 ℃ until being uniformly mixed, and then 2-22 parts by weight of prepolymer and 0.01-0.1 part by weight of catalyst are added into a reactor to react at the temperature of 130-150 ℃ for 1.5-2.5h, thus obtaining the polyurethane modified asphalt.
2. The method of producing the polyurethane-modified asphalt according to claim 1, comprising:
dehydrating 40-60 parts by weight of straight-chain polyol at the temperature of 110-130 ℃ under the vacuum pressure of-0.95 MPa for 2.5-3.5h, cooling to 60-70 ℃, uniformly stirring with 60-100 parts by weight of isocyanate monomer and 20-60 parts by weight of maleic anhydride, and then heating to 80-90 ℃ for reaction for 3-4 h; cooling to 55-60 ℃ to obtain a prepolymer;
stirring and dispersing 3-8 parts by weight of aromatic polyol and 75-90 parts by weight of matrix asphalt at the temperature of 110-130 ℃, then adding 2-22 parts by weight of prepolymer and 0.01-0.1 part by weight of catalyst into a reactor, and reacting at the temperature of 130-150 ℃ for 1.5-2.5h to obtain the polyurethane modified asphalt;
the linear polyol is selected from at least one of dihydric alcohol and trihydric alcohol with the average molecular weight of 300-2000;
the isocyanate monomer is selected from at least one of toluene diisocyanate, diphenylmethane diisocyanate and isophorone diisocyanate;
the aromatic polyol is at least one selected from polyether diol and polyether triol with average molecular weight of 2500-4000 and benzene ring structure;
the catalyst is at least one of dibutyl tin dilaurate, pyridine, dimethyl cyclohexylamine and organic bismuth.
3. The waterborne polyurethane modified asphalt emulsion is characterized by comprising the following components in percentage by weight:
40-70 parts of polyurethane modified asphalt, 23-59.4 parts of water, 0.5-4.0 parts of anionic emulsifier, 0.1-2.0 parts of stabilizer and 0-1 part of defoaming agent;
the polyurethane-modified asphalt is the polyurethane-modified asphalt of claim 1;
the anionic emulsifier is selected from at least one of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, tall oil, sodium naphthenate and sodium abietate;
the stabilizer is at least one selected from hydroxymethyl cellulose, hydroxyethyl cellulose, polyvinyl alcohol and polyacrylamide.
4. The method for preparing the aqueous polyurethane modified asphalt emulsion of claim 3, which is characterized by comprising the following steps:
dispersing and grinding 40-70 parts by weight of 150-170 ℃ polyurethane modified asphalt and 30-60 parts by weight of 55-65 ℃ soap solution by a colloid mill to obtain the waterborne polyurethane modified asphalt emulsion;
the soap solution comprises: 77-99 parts of water, 0.7-13.3 parts of anionic emulsifier, 0-3.3 parts of defoaming agent and 0.2-6.7 parts of stabilizer.
5. The method for preparing an aqueous polyurethane-modified asphalt emulsion according to claim 4,
the defoaming agent is at least one selected from mineral oil defoaming agent, polysiloxane defoaming agent and polyether defoaming agent.
6. The waterborne polyurethane modified asphalt waterproof coating for roads and bridges, which has high strength and high heat resistance, is characterized by comprising the following components in parts by weight:
10-25 parts of polymer emulsion, 0.5-1.5 parts of dispersant, 50-70 parts of waterborne polyurethane modified asphalt emulsion, 10-40 parts of filler and 0.5-5.0 parts of thickener;
the aqueous polyurethane modified asphalt emulsion is the aqueous polyurethane modified asphalt emulsion of claim 4;
the polymer emulsion is selected from at least one of pure acrylic emulsion, butylbenzene emulsion, ethylene-vinyl acetate emulsion and styrene-acrylic emulsion with the solid content of 55-70%;
the dispersing agent is selected from at least one of polycarboxylate, sodium dodecyl sulfate, triethyl hexyl sodium phosphate and sodium tripolyphosphate;
the filler is selected from at least one of glass beads, fumed silica, talcum powder and quartz powder;
the thickener is at least one selected from hydroxymethyl cellulose, hydroxyethyl cellulose, acrylic acid alkali swelling thickener, nonionic associative thickener and bentonite.
7. The preparation method of the waterborne polyurethane modified asphalt waterproof coating for roads and bridges of claim 6 is characterized by comprising the following steps:
and (2) uniformly stirring 10-25 parts by weight of polymer emulsion, 10-40 parts by weight of filler and 0.5-1.5 parts by weight of dispersant at the rotating speed of 1000rpm of 300-.
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| CN115322679B (en) * | 2022-03-23 | 2023-08-01 | 宜兴市华夏化工材料有限公司 | Waterproof material emulsion and application thereof |
| CN115926554B (en) * | 2022-12-12 | 2024-02-06 | 成都迪泰化工有限公司 | Multi-color elegant crystal stone coating and preparation method thereof |
| CN117142810B (en) * | 2023-09-12 | 2024-05-17 | 浙江威克赛新材料科技有限公司 | High-strength permeable asphalt concrete and preparation method thereof |
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| CN102464892B (en) * | 2010-11-13 | 2013-10-16 | 万华化学集团股份有限公司 | Composite polyurethane modifier for road asphalt |
| CN103102706B (en) * | 2013-01-22 | 2015-06-10 | 万华化学集团股份有限公司 | Polyurethane high-temperature-resistant anti-rutting modifier for road asphalt |
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