Water-based rubber asphalt waterproof coating and preparation method thereof

Abstract

The invention 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: 50-60 parts of asphalt, 50-60 parts of water, rubber emulsion: 8-12 parts of SEBS emulsion, 6-8 parts of rubber emulsion, 3-5 parts of an emulsifier, 0.2-0.5 part of a stabilizer, 2-3 parts of a coupling agent and 5-10 parts of filler. The invention also provides a preparation method of the water-based rubber asphalt waterproof coating. The waterproof coating has the advantages of high tear strength, high elastic recovery, high elongation, high self-healing property and the like, and also has excellent high temperature resistance, low temperature resistance, ozone resistance, ultraviolet resistance, aging resistance and weather resistance, so that the waterproof service life of a building is prolonged, and the waterproof coating is not only suitable for cold regions, but also suitable for hot regions, is wide in application territorial scope, and is worthy of popularization and application. And the use requirements of different regions and different climatic environments in China can be met.

Description

Technical Field

[0001] The invention belongs to the technical field of building waterproof materials, and specifically relates to a water-based rubber asphalt waterproof coating and a preparation method thereof. Background Art

[0002] Asphalt has good waterproofness and aging resistance. As a waterproof material, it has a long history of application. At present, asphalt is commonly used as a raw material to prepare asphalt-based waterproofing membranes and asphalt-based waterproof coatings. The construction of asphalt-based waterproofing membranes is relatively complicated. It usually needs to be heated and baked, which is easy to cause smoke and endanger the health of construction workers. The labor intensity of construction workers is high. Water-based asphalt waterproof coatings can be constructed at room temperature. It is not only environmentally friendly, but also particularly suitable for irregular base surfaces. It can be constructed on bases with complex shapes to form a flat, continuous and seamless coating film with good waterproof performance, so it is widely used. At present, most commonly used water-based asphalt waterproof coatings are polymer emulsion modified asphalt waterproof coatings. The preparation method is to modify emulsified asphalt with polymer emulsion, usually selecting styrene-butadiene rubber emulsion, nitrile rubber emulsion or chloroprene rubber emulsion, etc. Although the above polymer emulsion modified emulsified asphalt waterproof coating can meet the technical index requirements, when encountering external forces, due to insufficient film strength, it is easy to crack, the elastic recovery performance is relatively poor, and the self-healing property is poor. After the film is damaged, it often leads to water seepage or leakage. Summary of the invention

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

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

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

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

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

[0008] Preferably, the rubber latex is one or more of styrene-butadiene latex, chloroprene latex, nitrile latex, acrylate emulsion, styrene-acrylic emulsion or ethylene-vinyl acetate emulsion.

[0009] Preferably, the emulsifier is one or more of anionic emulsifiers, cationic emulsifiers or nonionic emulsifiers.

[0010] Preferably, the cationic emulsifier is hexadecyltrimethylammonium bromide, and the nonionic emulsifier is 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 di(diisooctylphosphoryl)methylhydroxyacetic acid titanate.

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

[0015] The present invention also provides a method for preparing a water-based rubber asphalt waterproof coating, comprising the following steps:

[0016] (1) Weigh water according to weight, add emulsifier, stabilizer and coupling agent to the water, stir to dissolve, and then add filler and stir;

[0017] (2) adding rubber latex and SEBS emulsion to step (1) and stirring evenly;

[0018] (3) Under the action of an emulsifier, asphalt is added to step (2), and the emulsification is stopped, and the material is cooled and discharged to obtain a water-based rubber asphalt waterproof coating.

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

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

[0021] 2. The water-based rubber asphalt waterproof coating of the present invention is constructed at room temperature and can be sprayed or scraped. The construction is simple, which overcomes the disadvantages that the construction of asphalt-based waterproof membranes is relatively complicated and usually requires heating and baking, which easily leads to the generation of smoke and harms the health of construction workers. It solves the problems caused by energy consumption, smoke emission during heating to pollute the environment, and high temperature may cause accidental burns to construction workers. It not only saves energy, but also does not generate asphalt smoke. Because it is green and environmentally friendly, it can be constructed not only in the suburbs, but also anywhere in the city.

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

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

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

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

[0026] According to the present invention, the modifier in the coating is a polymer emulsion, and the polymer emulsion used in the present invention is a mixture of SEBS emulsion and rubber emulsion, and the rubber emulsion is preferably a mixture of one or more of styrene-butadiene latex (SBR latex), chloroprene latex, nitrile latex, acrylate emulsion, styrene-acrylic emulsion or ethylene-vinyl acetate emulsion, preferably SEBS emulsion and styrene-butadiene latex. SEBS is prepared by hydrogenation polymerization of SBS butadiene segments, and is not easily oxidized because it does not contain unsaturated double bonds in the main molecular chain. Compared with SBS, SEBS not only has the general properties of SBS, but also has excellent properties such as ozone resistance, UV resistance, and aging resistance, and better thermal stability and weather resistance. SEBS is used for asphalt modification, and not only has excellent mechanical properties, high strength, good elasticity, high elastic recovery rate, but also has good high temperature resistance and low temperature performance, especially high temperature performance, which is particularly prominent. SBR has extension deformation ability, good compatibility with asphalt, can improve the rheological properties of asphalt, and greatly improves the viscoelasticity and low temperature elongation of asphalt. The synergistic effect of SEBS and SBR can greatly improve the heat resistance, low temperature resistance, elongation, tensile strength, etc. of asphalt, and also improve the adhesion with the base and coiled materials, thereby improving the waterproof performance and service life of waterproof materials. SEBS is linear, with a styrene / rubber ratio of 30-35 / 65-70, and the styrene content in styrene-butadiene latex is 22-25%.

[0027] According to the present invention, the emulsifier can be used alone as anionic emulsifier, cationic emulsifier, nonionic emulsifier, or compounded with anionic and nonionic, cationic and nonionic emulsifiers. Emulsifier is a key component for preparing high-performance water-based rubber asphalt waterproof coating. Its function is to reduce the surface tension of water, so that a stable encapsulated film is formed on the surface of the dispersed asphalt particles to prevent the asphalt particles from agglomerating. The present invention preferably compounds a cationic fast-cracking emulsifier with a nonionic emulsifier. On the one hand, the composite emulsifier can improve the film coagulation and drying speed of the coating, and on the other hand, it can better match the high molecular polymer emulsion without demulsification. The cationic emulsifier adopts a quaternary ammonium salt emulsifier, preferably hexadecyl trimethyl ammonium bromide, and the nonionic emulsifier adopts an alkylphenol polyoxyethylene ether, preferably OP-10.

[0028] According to the present invention, the stabilizer can be an organic polymer material or an inorganic salt. The function of the stabilizer is to increase the storage stability of emulsified asphalt, because emulsified asphalt is a water-in-oil type thermodynamically unstable dispersion system. Adding a stabilizer can increase the viscosity and density of the water phase, increase the resistance of the Brownian motion of asphalt particles, enhance the double-layer electrical effect between asphalt particles, increase the repulsive force between particles, and slow down the coagulation speed between particles. The present invention preferably uses a polymer material cationic polyacrylamide as a stabilizer.

[0029] According to the present invention, 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 can also disperse the modifier into the asphalt better to increase the elongation and deformation properties of the coating. The titanate coupling agent is preferably di(diisooctylphosphoryl)methylhydroxyacetic acid titanate.

[0030] According to the present invention, the filler is one or a mixture of fly ash, talcum powder, and calcium carbonate. The filler is used to absorb asphalt, so that the asphalt is arranged in a single molecule on the surface of the talcum powder, forming an asphalt film with a strong bonding force, thereby improving the viscosity and heat resistance of the coating. Preferably, the talcum powder has a mesh size of 800-1000.

[0031] The present invention also provides a method for preparing a water-based rubber asphalt waterproof coating, comprising the following steps:

[0032] (1) Weigh water according to weight proportions, and add an emulsifier, a stabilizer and a coupling agent to the water, preferably stirring and heating to 55±1° C. until the emulsifier and the stabilizer are dissolved, and then adding a filler and stirring, the stirring speed is preferably 1500-2000 r / min, and the stirring time is preferably 10-15 min;

[0033] (2) adding rubber latex and SEBS emulsion to step (1) and stirring evenly;

[0034] (3) Under the action of an emulsifier, asphalt at a temperature of 130-140° C. is added to step (2), and the process is stopped after emulsification. The emulsification time is preferably 5-8 min, and the material is cooled and discharged to obtain a water-based rubber asphalt waterproof coating.

[0035] The present invention is further described in detail below in conjunction with specific examples. The raw materials involved in the examples are all commercially available.

[0036] Example 1

[0037] A high-performance water-based rubber asphalt waterproof coating comprises the following components by weight: 50 parts of 70# asphalt, 50 parts of water, 8 parts of SEBS emulsion, 8 parts of SBR latex, 2 parts of hexadecyltrimethylammonium bromide, 1 part of OP-10, 2.5 parts of di(diisooctylphosphoryl)methylhydroxyacetic acid titanate, 0.2 parts of cationic polyacrylamide, and 5 parts of talc.

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

[0039] (1) Weigh water according to the above weight proportions, add emulsifier hexadecyltrimethylammonium bromide, OP-10, stabilizer cationic polyacrylamide and coupling agent di(diisooctylphosphoryl)methylhydroxyacetic acid titanate to the water, stir and heat to 55° C. until the emulsifier and stabilizer are dissolved, then add filler talc and stir, the stirring speed is 1800 r / min, and the stirring time is 12 min;

[0040] (2) adding SBR latex and SEBS emulsion to step (1) and stirring evenly;

[0041] (3) Under the action of an emulsifier, asphalt at a temperature of 135° C. is added to step (2), and the emulsification is stopped after 6 minutes, and the material is cooled and discharged to obtain a water-based rubber asphalt waterproof coating.

[0042] Example 2

[0043] A high-performance water-based rubber asphalt waterproof coating comprises the following components by weight: 55 parts of 70# asphalt, 55 parts of water, 10 parts of SEBS emulsion, 7 parts of SBR latex, 2 parts of hexadecyltrimethylammonium bromide, 2 parts of OP-10, 2 parts of di(diisooctylphosphoryl)methylhydroxyacetic acid titanate, 0.35 parts of cationic polyacrylamide, and 7.5 parts of talc.

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

[0045] Example 3

[0046] A high-performance water-based rubber asphalt waterproof coating comprises the following components by weight: 60 parts of 70# asphalt, 60 parts of water, 12 parts of SEBS emulsion, 6 parts of SBR latex, 3 parts of hexadecyltrimethylammonium bromide, 2 parts of OP-10, 3 parts of di(diisooctylphosphoryl)methylhydroxyacetic acid titanate, 0.5 parts of cationic polyacrylamide, and 10 parts of talc.

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

[0048] Comparative Example 1

[0049] A water-based rubber asphalt waterproof coating comprises the following components by weight: 50 parts of 70# asphalt, 50 parts of water, 16 parts of SBR latex, 2 parts of hexadecyltrimethylammonium bromide, 1 part of OP-10, 2.5 parts of di(diisooctylphosphoryl)methylhydroxyacetic acid titanate, 0.2 parts of cationic polyacrylamide and 5 parts of talc.

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

[0051] Comparative Example 2

[0052] A water-based rubber asphalt waterproof coating comprises the following components by weight: 50 parts of 70# asphalt, 50 parts of water, 16 parts of SEBS emulsion, 2 parts of hexadecyltrimethylammonium bromide, 1 part of OP-10, 2.5 parts of di(diisooctylphosphoryl)methylhydroxyacetic acid titanate, 0.2 parts of cationic polyacrylamide and 5 parts of talc.

[0053] The water-based rubber asphalt waterproof coating was prepared according to the preparation method of Example 1.

[0054] The high performance water-based rubber asphalt waterproof coating of the present invention was tested for performance and compared with the comparative example, and the results are shown in Table 1. Table 2 shows the physical and mechanical performance indicators of the JC / T 408-2005 water-emulsified asphalt waterproof coating.

[0055] Table 1 Test results of high performance water-based rubber asphalt waterproof coating and comparative example

[0056]

[0057] Table 2 Physical and mechanical properties of water-emulsified asphalt waterproof coating.

[0058]

[0059] It can be seen from the above examples and comparative examples that the performance of the waterproof coating of the invention far exceeds the physical and mechanical performance index requirements of the water-emulsified asphalt waterproof coating specified in JC / T408-2005. Since SBR emulsion and SBS emulsion are used as a composite modifier, the prepared waterproof coating has good performance in all aspects, which not only greatly improves the reliability of waterproofing, but also makes the construction efficient and convenient, and is environmentally friendly.

[0060] The embodiments of the present invention are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A water-based rubber asphalt waterproof coating, characterized in that: The invention comprises the following raw materials in parts by weight: 50-60 parts of asphalt, 50-60 parts of water, 8-12 parts of SEBS emulsion, 6-8 parts of rubber emulsion, 3-5 parts of emulsifier, 0.2-0.5 parts of stabilizer, 2-3 parts of coupling agent, and 5-10 parts of filler.

2. The water-based rubber asphalt waterproof coating according to claim 1, characterized in that: The asphalt is one of 50#, 70#, 90# or 110# or a mixture of several of them.

3. The water-based rubber asphalt waterproof coating according to claim 1, characterized in that: The rubber latex is one or more of styrene-butadiene latex, chloroprene latex, nitrile latex, acrylic emulsion, styrene-acrylic emulsion or ethylene-vinyl acetate emulsion.

4. The water-based rubber asphalt waterproof coating according to claim 1, characterized in that: The emulsifier is one or more of anionic emulsifier, cationic emulsifier or nonionic emulsifier.

5. The water-based rubber asphalt waterproof coating according to claim 4, characterized in that: The cationic emulsifier is hexadecyltrimethylammonium bromide, and the nonionic emulsifier is alkylphenol polyoxyethylene ether.

6. The water-based rubber asphalt waterproof coating according to claim 1, characterized in that: The stabilizer is cationic polyacrylamide.

7. The water-based rubber asphalt waterproof coating according to claim 1, characterized in that: The coupling agent is a silane coupling agent or a titanate coupling agent.

8. The water-based rubber asphalt waterproof coating according to claim 7, characterized in that: The titanate coupling agent is di(diisooctylphosphoryl)methylhydroxyacetic acid titanate.

9. The water-based rubber asphalt waterproof coating according to claim 1, characterized in that: The filler is one or a mixture of fly ash, talcum powder and calcium carbonate.

10. The method for preparing a water-based rubber asphalt waterproof coating according to claim 1, characterized in that: The steps include: (1) Weigh water according to weight, add emulsifier, stabilizer and coupling agent to the water, stir to dissolve, and then add filler and stir; (2) adding rubber latex and SEBS emulsion to step (1) and stirring evenly; (3) Under the action of an emulsifier, asphalt is added to step (2), and the emulsification is stopped, and the material is cooled and discharged to obtain a water-based rubber asphalt waterproof coating.

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