Water-based rubber asphalt waterproof coating and preparation method thereof

Abstract

The application provides a water-based rubber asphalt waterproof coating and a preparation method thereof, and belongs to the technical field of building waterproof materials. The coating comprises the following raw materials in parts by weight: asphalt 50-60 parts, water 50-60 parts, rubber emulsion: SEBS emulsion 8-12 parts, rubber emulsion 6-8 parts, emulsifier 3-5 parts, stabilizer 0.2-0.5 parts, coupling agent 2-3 parts, and filler 5-10 parts. The application also provides a preparation method of the water-based rubber asphalt waterproof coating. The waterproof coating has the advantages of high tear resistance, high elastic recovery, high elongation, high self-healing property and the like, and simultaneously has excellent high-temperature resistance, low-temperature resistance, ozone resistance, ultraviolet resistance, aging resistance and weather resistance, thereby prolonging the waterproof service life of the building. The waterproof coating is not only suitable for cold regions, but also suitable for hot regions, has a wide application range, and can meet the use requirements of different regions and different climate environments in China.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of building waterproof materials, and particularly relates to a water-based rubber asphalt waterproof coating and a preparation method thereof. BACKGROUND

[0002] Asphalt has good waterproofness and aging resistance, and has a long application history as a waterproof material. At present, asphalt is commonly used as a raw material to prepare asphalt-based waterproof coiled materials and asphalt-based waterproof coatings. The construction of asphalt-based waterproof coiled materials is relatively complex, usually requires heating and baking, which is easy to cause smoke and harm the health of construction personnel, and the labor intensity of construction personnel is high. The water-based asphalt waterproof coating can be constructed at room temperature, is environmentally friendly, and is particularly suitable for irregular base surfaces, can be constructed on a complex-shaped base layer, forms a smooth, continuous and seamless coating film, has good waterproof performance, and thus is widely used. Most of the commonly used water-based asphalt waterproof coatings are polymer emulsion modified asphalt waterproof coatings, and the preparation method is to modify the emulsified asphalt with a polymer emulsion, usually selecting a styrene-butadiene rubber emulsion, a nitrile rubber emulsion or a chlorobutyl rubber emulsion, etc. Although the above-mentioned polymer emulsion modified emulsified asphalt waterproof coating can meet the technical index requirements, when encountering external force, the coating film is easy to crack due to insufficient strength, has relatively poor elastic recovery performance, has poor self-healing performance, and after the coating film is damaged, water seepage or leakage often occurs. SUMMARY

[0003] The purpose of the present application is to provide a water-based rubber asphalt waterproof coating and a preparation method thereof. The waterproof coating has excellent waterproof performance, can be used as a waterproof layer alone, or can be used in combination with a waterproof coiled material. The waterproof coating has the advantages of high tear resistance, high elastic recovery, high elongation, high self-healing performance, and excellent high-temperature resistance, low-temperature resistance, ozone resistance, ultraviolet resistance, aging resistance and weather resistance, thereby improving the waterproof service life of a building. The waterproof coating is not only suitable for cold regions, but also suitable for hot regions, has a wide range of adaptability, and can meet the use requirements of different regions and different climate environments in China.

[0004] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0005] The present application first discloses a water-based rubber asphalt waterproof coating, which comprises the following raw materials in parts by weight:

[0006] Asphalt 50-60 parts, water 50-60 parts, SEBS emulsion 8-12 parts, rubber emulsion 6-8 parts, emulsifier 3-5 parts, stabilizer 0.2-0.5 parts, coupling agent 2-3 parts, and filler 5-10 parts.

[0007] Preferably, the asphalt is one or a mixture of 50#, 70#, 90# or 110#.

[0008] Preferably, the rubber emulsion is one or more of a styrene-butadiene rubber emulsion, a chloroprene rubber emulsion, an acrylonitrile-butadiene rubber emulsion, an acrylate emulsion, a styrene-acrylate emulsion, or an ethylene-vinyl acetate emulsion.

[0009] Preferably, the emulsifier is one or more of an anionic emulsifier, a cationic emulsifier, or a non-ionic emulsifier.

[0010] Preferably, the cationic emulsifier is cetyltrimethylammonium bromide, and the non-ionic emulsifier is an alkylphenol polyoxyethylene ether.

[0011] Preferably, the stabilizer is cationic polyacrylamide.

[0012] Preferably, the coupling agent is a silane coupling agent or a titanate coupling agent.

[0013] Preferably, the titanate coupling agent is titanium diisooctyl phosphato methyl glycolate.

[0014] Preferably, the filler is a mixture of one or more of fly ash, talcum powder, and calcium carbonate.

[0015] The present application also provides a preparation method of the water-based rubber asphalt waterproof coating.

[0016] (1) The water is weighed, and the emulsifier, stabilizer, and coupling agent are added to the water, stirred and dissolved, and then the filler is added and stirred.

[0017] (2) The rubber emulsion and SEBS emulsion are added to step (1) and stirred uniformly.

[0018] (3) The asphalt is added to step (2) under the action of an emulsifying machine, and after emulsification, the process is stopped and the product is cooled and discharged, thereby obtaining the water-based rubber asphalt waterproof coating.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] 1. The present application provides a water-based rubber asphalt waterproof coating and a preparation method thereof. The coating includes SEBS emulsion and SBR latex, and the synergistic effect of SEBS and SBR can greatly improve the heat resistance, low-temperature resistance, elongation, tensile strength, and adhesion to the base layer and the roll material of the asphalt, thereby improving the waterproof performance and service life of the waterproof material.

[0021] 2. The water-based rubber asphalt waterproof coating of the present application can be sprayed or scraped at room temperature, and is simple to operate, overcomes the complex construction of asphalt-based waterproof coiled material, which usually requires heating and baking, which can easily cause smoke and harm the health of construction workers, solves the problems of energy consumption, smoke emission during the heating process, environmental pollution, and the possibility of accidental burns of construction workers at high temperatures, saves energy, and does not produce asphalt smoke, is green and environmentally friendly, and can be used for construction not only in the suburbs but also in any place in the city.

[0022] 3. The high-performance water-based rubber asphalt waterproof coating of the present application has high tear resistance, high elastic recovery, high elongation, high self-healing property, excellent high-temperature resistance, low-temperature resistance, ozone resistance, ultraviolet resistance, aging resistance, and weather resistance, and can be used as a waterproof layer alone, and has waterproof performance comparable to that of waterproof coiled material. The preparation process of the present application is simple, the preparation conditions are easy to operate, the addition of titanate coupling agent improves the corrosion resistance, flame resistance, and adhesion to the base layer of the coating, and further improves the waterproof performance. DETAILED DESCRIPTION

[0023] The present application first discloses a water-based rubber asphalt waterproof coating, which comprises the following raw materials in parts by weight:

[0024] Asphalt 50-60 parts, water 50-60 parts, SEBS emulsion 8-12 parts, rubber emulsion 6-8 parts, emulsifier 3-5 parts, stabilizer 0.2-0.5 parts, coupling agent 2-3 parts, and filler 5-10 parts.

[0025] According to the present application, the asphalt is heavy asphalt. Asphalt is the main component of high-performance rubber asphalt waterproof coating, and petroleum asphalt itself has excellent waterproof performance and certain adhesion, but is hot and brittle at low temperature, has poor high and low temperature resistance, and has low mechanical properties, so it needs to be modified to obtain excellent high and low temperature resistance, adhesion, elongation at break, and tensile strength, and good waterproof effect. The asphalt used in the present application is preferably one or a mixture of 50#, 70#, 90#, and 110#, and more preferably 70# and 90# heavy asphalt.

[0026] According to the present application, the modifier in the coating is a polymer emulsion, and the polymer emulsion used in the present application is a mixture of SEBS emulsion and rubber emulsion. The rubber emulsion is preferably a mixture of one or more of styrene-butadiene rubber latex (SBR latex), chloroprene rubber latex, butyronitrile rubber latex, acrylate emulsion, styrene-acrylate emulsion, or ethylene-vinyl acetate emulsion, and preferably SEBS emulsion and styrene-butadiene rubber latex. SEBS is prepared by hydrogenation polymerization of SBS through butadiene segments, and is not easy to be oxidized due to the absence of unsaturated double bonds in the molecular backbone. Compared with SBS, SEBS not only has the common properties of SBS, but also has excellent properties such as ozone resistance, ultraviolet resistance, and aging resistance, and has better thermal stability and weather resistance. SEBS is used for asphalt modification, and has excellent mechanical properties, high strength, good elasticity, high elastic recovery rate, good high-temperature resistance and low-temperature resistance, and especially outstanding high-temperature resistance. SBR has the ability of extension deformation, has good compatibility with asphalt, can improve the rheological properties of asphalt, and greatly improves the viscoelasticity and low-temperature extension of asphalt. The synergistic effect of SEBS and SBR can greatly improve the heat resistance, low-temperature resistance, extension, and tensile strength of asphalt, and also improves the adhesion to the base layer and the roll material, thereby improving the waterproof performance and service life of the waterproof material. The SEBS is linear, and the styrene / rubber ratio is 30-35 / 65-70. The styrene content in the styrene-butadiene rubber latex is 22-25%.

[0027] According to the present application, the emulsifier can be anionic, cationic, or non-ionic emulsifier alone, or a mixture of anionic and non-ionic emulsifiers, or a mixture of cationic and non-ionic emulsifiers. The emulsifier is a key component for preparing high-performance water-based rubber asphalt waterproof coating. Its role is to reduce the surface tension of water, form a stable encapsulated film on the surface of dispersed asphalt particles, and prevent the aggregation of asphalt particles. In the present application, the cationic fast-setting emulsifier is preferably compounded with a non-ionic emulsifier. The compound emulsifier can not only improve the film setting and drying speed of the coating, but also better match the high-molecular polymer emulsion, and will not cause demulsification. The cationic emulsifier is a quaternary ammonium salt emulsifier, and the non-ionic emulsifier is an alkyl phenol polyoxyethylene ether, and op-10 is preferred.

[0028] According to the present application, the stabilizer can be an organic high-molecular material or an inorganic salt. The role of the stabilizer is to increase the storage stability of the emulsified asphalt. Because the emulsified asphalt is a thermodynamically unstable dispersion system of oil-in-water, the addition of the stabilizer can increase the viscosity and density of the water phase, increase the resistance of the Brownian motion of the asphalt particles, enhance the double-layer electric effect between the asphalt particles, increase the repulsive force between the particles, and slow down the aggregation speed between the particles. In the present application, the high-molecular material cationic polyacrylamide is used as the stabilizer.

[0029] According to the application, the coupling agent can be a silane coupling agent or a titanate coupling agent. The coupling agent can form a chemical bond between the base layer and the asphalt through a chemical bond to improve adhesion, and better disperse the modifier in the asphalt to increase the extension deformation performance of the coating. Preferably, the coupling agent is di(dioctylphosphoryl)methyl titanate.

[0030] According to the application, the filler is a mixture of one or more of fly ash, talc powder and calcium carbonate. The filler can adsorb asphalt, arrange the asphalt in a monomolecular state on the surface of the talc powder, form a thin film of asphalt with strong binding force, and improve the adhesion and heat resistance of the coating. Preferably, the talc powder is 800-1000 mesh.

[0031] The application also provides a preparation method of the water-based rubber asphalt waterproof coating, which comprises the following steps:

[0032] (1) The water is weighed by weight fraction, and the emulsifier, stabilizer and coupling agent are added to the water. Preferably, the water is stirred and heated to 55±1℃ until the emulsifier and stabilizer are dissolved, and then the filler is added and stirred. The stirring speed is preferably 1500-2000r / min, and the stirring time is preferably 10-15min;

[0033] (2) The rubber emulsion and SEBS emulsion are added to step (1) and stirred uniformly;

[0034] (3) The asphalt with a temperature of 130-140℃ is added to step (2) under the action of the emulsifier, and the emulsification is stopped after emulsification. The emulsification time is preferably 5-8min, and the material is discharged after cooling. Thus, the water-based rubber asphalt waterproof coating is obtained.

[0035] The application will be further described in detail in combination with specific examples. The raw materials involved in the examples are commercially available.

[0036] Example 1

[0037] A high-performance water-based rubber asphalt waterproof coating comprises the following components by weight fraction: 70# asphalt 50 parts, water 50 parts, SEBS emulsion 8 parts, SBR latex 8 parts, cetyltrimethylammonium bromide 2 parts, op-10 1 part, di(dioctylphosphoryl)methyl titanate 2.5 parts, cationic polyacrylamide 0.2 parts, and talc powder 5 parts.

[0038] A preparation method of a water-based rubber asphalt waterproof coating comprises the following steps:

[0039] (1) According to the above weight parts of water, and to the water into the emulsifier cetyl trimethyl ammonium bromide, op-10, stabilizer cationic polyacrylamide and coupling agent di (diisooctyl phosphor) methyl glycolic acid titanium ester, stirring and heating to 55℃, until the emulsifier and stabilizer dissolved, then the filler talc stirring, the stirring speed is 1800r / min, stirring time is 12min;

[0040] (2) To step (1) adding SBR latex and SEBS emulsion, stirring uniform;

[0041] (3) In the emulsifying machine, the temperature is 135℃ asphalt into step (2), emulsification 6min after stop, cooling discharge, can obtain water-based rubber asphalt waterproof coating.

[0042] Example 2

[0043] A kind of high performance water-based rubber asphalt waterproof coating, by weight parts includes the following components: 70 # asphalt 55 parts, water 55 parts, SEBS emulsion 10 parts, SBR latex 7 parts, cetyl trimethyl ammonium bromide 2 parts, op-10 2 parts, di (diisooctyl phosphor) methyl glycolic acid titanium ester 2 parts, cationic polyacrylamide 0.35 parts, talc 7.5 parts.

[0044] The above water-based rubber asphalt waterproof coating is prepared according to the preparation method of example 1.

[0045] Example 3

[0046] A kind of high performance water-based rubber asphalt waterproof coating, by weight parts includes the following components: 70 # asphalt 60 parts, water 60 parts, SEBS emulsion 12 parts, SBR latex 6 parts, cetyl trimethyl ammonium bromide 3 parts, op-10 2 parts, di (diisooctyl phosphor) methyl glycolic acid titanium ester 3 parts, cationic polyacrylamide 0.5 parts, talc 10 parts.

[0047] The above water-based rubber asphalt waterproof coating is prepared according to the preparation method of example 1.

[0048] Comparative example 1

[0049] A kind of water-based rubber asphalt waterproof coating, by weight parts includes the following components: 70 # asphalt 50 parts, water 50 parts, SBR latex 16 parts, cetyl trimethyl ammonium bromide 2 parts, op-10 1 part, di (diisooctyl phosphor) methyl glycolic acid titanium ester 2.5 parts, cationic polyacrylamide 0.2 parts, talc 5 parts.

[0050] The above water-based rubber asphalt waterproof coating is prepared according to the preparation method of example 1.

[0051] Comparative example 2

[0052] An aqueous rubber asphalt waterproof coating comprises the following components in parts by weight: 70# asphalt 50 parts, water 50 parts, SEBS emulsion 16 parts, cetyl trimethyl ammonium bromide 2 parts, op-10 1 part, bis (diisooctyl phosphoric acid) methyl hydroxy titanium acetate 2.5 parts, cationic polyacrylamide 0.2 parts, talc 5 parts.

[0053] The above aqueous rubber asphalt waterproof coating is prepared according to the preparation method of Example 1.

[0054] The high-performance aqueous rubber asphalt waterproof coating of the present application is tested for performance and compared with the comparative example, and the results are shown in Table 1. Table 2 is the physical and mechanical performance index of the water emulsion type asphalt waterproof coating according to JC / T 408-2005.

[0055] Table 1 Detection results of high-performance aqueous rubber asphalt waterproof coating and comparative example

[0056]

[0057] Table 2 Physical and mechanical performance index of water emulsion type asphalt waterproof coating.

[0058]

[0059] From the above results of examples and comparative examples, it can be seen that the performance of the waterproof coating of the present application far exceeds the physical and mechanical performance index requirements of the water emulsion type asphalt waterproof coating specified in JC / T 408-2005, because SBR emulsion and SBS emulsion are used as a modifier, the prepared waterproof coating has good performance in all aspects, not only greatly improves the reliability of waterproofing, but also is efficient and convenient for construction, and is friendly to the environment.

[0060] The above embodiments of the present application are described in detail, and specific examples are applied to explain the principles and implementation methods of the present application. The above description of the embodiments is only used to help understand the method of the present application and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation method and application range will be changed, and the above description should not be understood as a limitation of the present application.

Claims

1. An aqueous rubber bituminous waterproofing coating, characterized by, It is composed of the following raw materials in weight parts: Asphalt 50-60 parts, water 50-60 parts, SEBS emulsion 8-12 parts, styrene-butadiene latex 6-8 parts, emulsifier 3-5 parts, stabilizer 0.2-0.5 parts, coupling agent 2-3 parts, filler 5-10 parts.

2. The aqueous rubberized asphalt waterproofing coating according to claim 1, characterized in that, The asphalt is one or a mixture of several of 50#, 70#, 90# or 110#.

3. The aqueous rubberized asphalt waterproofing coating according to claim 1, characterized in that, The emulsifier is one or a mixture of several of anionic emulsifier, cationic emulsifier or non-ionic emulsifier.

4. The aqueous rubberized asphalt waterproofing coating according to claim 3, characterized in that, The cationic emulsifier is cetyltrimethylammonium bromide, and the non-ionic emulsifier is alkylphenol polyoxyethylene ether.

5. The aqueous rubberized asphalt waterproofing coating of claim 1, wherein, The stabilizer is cationic polyacrylamide.

6. The aqueous rubberized asphalt waterproofing coating of claim 1, wherein, The coupling agent is silane coupling agent or titanate coupling agent.

7. The aqueous rubberized asphalt waterproofing coating of claim 6, wherein, The titanate coupling agent is di (diisooctyl phosphor) methyl titanate.

8. The aqueous rubberized asphalt waterproofing coating of claim 1, wherein, The filler is a mixture of one or several of fly ash, talcum powder, calcium carbonate.

9. The method for preparing a water-based rubber asphalt waterproof coating according to claim 1, characterized in that, It comprises the following steps: (1) water is weighed according to weight parts, and emulsifier, stabilizer and coupling agent are added to the water, stirred and dissolved, and then filler is added and stirred; (2) styrene-butadiene latex and SEBS emulsion are added to step (1) and stirred uniformly; (3) under the action of emulsifier, asphalt is added to step (2), emulsified, stopped, cooled and discharged, and then water-based rubber asphalt waterproof coating is obtained.

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