Water-based non-cured rubber asphalt waterproof coating and preparation method thereof

Abstract

The invention provides a water-based non-cured rubber asphalt waterproof coating and a preparation method thereof, and belongs to the technical field of building waterproof materials. The waterproof coating comprises the following raw materials in parts by weight: 50-60 parts of asphalt, 20-30 parts of a compatilizer, 9-14 parts of a modifier, 3-5 parts of a tackifier, 1.5-2.5 parts of a coupling agent, 50-60 parts of water, 3-5 parts of an emulsifier and 0.2-0.5 part of a stabilizer, the modifier is a thermoplastic elastomer and a high-molecular polymer emulsion. The invention also provides a preparation method of the water-based non-cured rubber asphalt waterproof coating. The coating does not need to be heated and can be constructed at normal temperature, the performance of the coating is equivalent to that of a hot-melt non-cured rubber asphalt waterproof coating, and the corrosion resistance and flame retardance of the coating and the cohesiveness of a base layer are improved.

Description

Technical Field

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

[0002] Non-curing rubber asphalt waterproof coating is a creep-type waterproof coating that can meet the needs of building deformation. Due to its good adhesion, creep and self-healing properties, it can be used as a waterproof layer alone to seal the pores and cracks in the base layer and solve the problem of water seepage in the waterproof layer. It can also be used as a waterproof adhesive to stick waterproof membranes to form a composite waterproof layer, solving the compatibility problem of existing waterproof membranes and waterproof coatings when used in combination, greatly improving the waterproof performance of construction projects, and therefore is widely used.

[0003] Most of the non-curing rubber asphalt waterproof coatings commonly used in construction are hot-melt materials, which require high-temperature heating to spray or scrape, and are prone to fire. Not only do they consume energy, but they also produce smoke during the hot-melt process, causing environmental pollution. In addition, due to the high construction temperature, construction workers are often scalded, and the safety is poor. Many places prohibit the construction of hot-melt non-curing rubber asphalt waterproof coatings in the city. There are a few reports on water-based non-curing rubber asphalt waterproof materials, but it is necessary to prepare modified asphalt first and then emulsify the modified asphalt. The preparation temperature of modified asphalt is high, and the preparation process and method have high requirements on the performance of the shearing equipment and high energy consumption. Summary of the invention

[0004] The purpose of the present invention is to provide a water-based non-curing rubber asphalt waterproof coating and a preparation method thereof. The coating does not need to be heated and can be constructed at room temperature, thereby avoiding the damage to the health of construction workers caused by high temperature and asphalt fumes generated by heating, saving energy, and being green and environmentally friendly. The preparation process of the coating is simple, does not require high-performance shearing equipment, can reduce the preparation temperature, reduce energy consumption, and the preparation conditions are easy to operate. According to the process steps of the present invention, any ionic type of polymer emulsion can be used as a modifier, expanding the selection range of the modifier emulsion. The performance of the coating is not only comparable to that of hot-melt non-curing rubber asphalt waterproof coating, but also improves the corrosion resistance, flame retardancy and adhesion of the base layer of the coating.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] The invention provides a water-based non-curing rubber asphalt waterproof coating, comprising the following raw materials in parts by weight: 50-60 parts of asphalt, 20-30 parts of compatibilizer, 9-14 parts of modifier, 3-5 parts of tackifier, 1.5-2.5 parts of coupling agent, 50-60 parts of water, 3-5 parts of emulsifier, and 0.2-0.5 parts of stabilizer; the modifier is a thermoplastic elastomer and a high molecular polymer emulsion.

[0007] Preferably, the thermoplastic elastomer includes one or a mixture of SBS, SIS, SEBS, SEPS, and CPE, and the high molecular polymer emulsion includes one or a mixture of styrene-butadiene latex, chloroprene latex, nitrile latex, acrylic emulsion, styrene-acrylic emulsion, or ethylene-vinyl acetate emulsion.

[0008] Preferably, the modifier comprises 5-8 parts of SBS and 4-6 parts of SBR.

[0009] Preferably, the compatibilizer is one or a mixture of catalytic cracking slurry, aromatic oil, cyclohexane oil or diluent oil.

[0010] Preferably, the tackifier comprises one or a mixture of coumarone resin, terpene resin, rosin resin, C5 petroleum resin or C9 petroleum resin.

[0011] Preferably, the coupling agent is di(diisooctylphosphoryl)methylhydroxyacetic acid titanate.

[0012] Preferably, the emulsifier is a cationic or nonionic emulsifier.

[0013] Preferably, the cationic emulsifier is octadecyltrimethylammonium chloride, and the nonionic emulsifier is OP-10.

[0014] Preferably, the stabilizer is cationic polyacrylamide.

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

[0016] (1) According to the mixing ratio, weigh the thermoplastic elastomer and add it to the compatibilizer, and heat it until the thermoplastic elastomer is completely dissolved;

[0017] (2) adding asphalt and a tackifier to the mixture of step (1) in sequence for modification to obtain modified asphalt;

[0018] (3) Weighing water according to the ratio, and adding the high molecular polymer emulsion, emulsifier, stabilizer, and coupling agent to the water in order, stirring until dissolved, to obtain an emulsion;

[0019] (4) Under the action of a colloid mill, the modified asphalt obtained in step (2) is added to the emulsion for mixing and emulsification to obtain a water-based non-curing rubber asphalt waterproof coating.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention provides a water-based non-curing rubber asphalt waterproof coating and a preparation method thereof. The coating comprises SBS and SBR. The synergistic effect of SBS and SBR can greatly improve the heat resistance, low temperature resistance, elongation, elasticity and the like of asphalt, and also can improve the adhesion to a base layer and a coiled material.

[0022] The water-based non-curing rubber asphalt waterproof coating of the present invention can be constructed at room temperature, which overcomes the drawback that the currently commonly used hot-melt non-curing rubber asphalt waterproof coating needs to be heated to a higher temperature (greater than 100°C) before construction, and solves the problems caused by the energy consumption, the emission of smoke during the heating process to pollute the environment, and the high temperature may cause accidental burns to construction personnel. It not only saves energy, but also does not produce asphalt smoke. Because it is green and environmentally friendly, it can be constructed not only in the suburbs, but also anywhere in the city. Using the preparation process of the present invention, anionic, cationic, or non-ionic high molecular polymer emulsions of any ion type can be used as modifiers, breaking through the restrictions on the ion type of high molecular polymer emulsions, so that the selection range of modifiers is wider. Compared with the preparation of hot-melt non-curing rubber asphalt, the preparation of the coating does not require high-performance shearing equipment, the preparation temperature is relatively low, the preparation process is simple, and the preparation conditions are easy to operate. The performance of the coating is not only equivalent to that of the hot-melt non-curing rubber asphalt waterproof coating, but also improves the elongation, corrosion resistance, flame retardancy and adhesion to the base layer of the coating due to the addition of titanate coupling agent. DETAILED DESCRIPTION

[0023] In order to more clearly understand the technical essence of the present invention, the applicant will describe in detail the specific implementation methods of the present invention below.

[0024] The invention provides a water-based non-curing rubber asphalt waterproof coating, comprising the following raw materials in parts by weight: 50-60 parts of asphalt, 20-30 parts of compatibilizer, 9-14 parts of modifier, 3-5 parts of tackifier, 1.5-2.5 parts of coupling agent, 50-60 parts of water, 3-5 parts of emulsifier, and 0.2-0.5 parts of stabilizer; the modifier is a thermoplastic elastomer and a high molecular polymer emulsion.

[0025] According to the present invention, the asphalt is heavy traffic asphalt, which is the main component of the non-curing rubber asphalt waterproof coating. Petroleum asphalt itself has excellent waterproof performance. It only needs to be modified to have excellent high temperature resistance, low temperature resistance and adhesion, thereby obtaining a good waterproof effect. The asphalt used in the present invention is preferably one or a mixture of 50#, 70#, 90#, and 110#, and more preferably 70# and 90# heavy traffic asphalt.

[0026] According to the present invention, the modifier includes a thermoplastic elastomer and a high molecular polymer emulsion. Traditional pure asphalt has the property of high temperature flowing and low temperature brittle cracking, which cannot meet the modern waterproofing needs, so it is necessary to modify the asphalt with a modifier to improve the high temperature and low temperature performance of the asphalt and meet the needs. The thermoplastic elastomer used in the present invention preferably includes one or more mixtures of SBS, SIS, SEBS, SEPS, and CPE, and the high molecular polymer emulsion preferably includes one or more mixtures of styrene-butadiene latex, chloroprene latex, nitrile latex, acrylate emulsion, styrene-acrylic emulsion, and ethylene-vinyl acetate emulsion, preferably including 5-8 parts of SBS and 4-6 parts of SBR. SBS is the most widely used general asphalt modifier that can basically adapt to the climatic and environmental conditions of various regions. It is characterized in that it can provide good high and low temperature performance, especially outstanding high temperature performance. 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 SBS and SBR can greatly improve the heat resistance, low temperature resistance, elongation, elasticity, etc. of asphalt, and also improve the adhesion with the base and coiled materials. The block ratio of SBS is S / B=30-40 / 60-70, and the styrene content in styrene-butadiene latex is 22-25%.

[0027] According to the present invention, the compatibilizer is preferably a mixture of one or more of catalytic cracking oil slurry, aromatic oil, naphthenic oil, and line-cutting oil. The main function of the compatibilizer is to accelerate the dissolution rate of SBS, enhance the compatibility of SBS and asphalt, and make SBS uniformly dispersed in asphalt to form a stable continuous distribution phase, so that the components interact more fully, thereby improving the initial viscosity, while reducing the cohesive force of the coating, ensuring the creep characteristics of the coating, and helping to enhance the elongation, low-temperature flexibility and other properties of the waterproof coating. More preferably, naphthenic oil, the open flash point of naphthenic oil is not less than 210°C.

[0028] According to the present invention, the tackifier preferably includes one or a mixture of coumarone resin, terpene resin, rosin resin, C5 petroleum resin, and C9 petroleum resin, and coumarone resin is more preferred. The softening point of coumarone resin is 95-105°C. The role of the tackifier is to wet the bonding surface through surface diffusion or internal diffusion, so as to improve the bonding strength between the waterproof coating and the adhered material. It can reduce the cohesive strength of the waterproof coating, and give it initial adhesion and peel strength, so that the viscosity of the waterproof coating is increased, the combination with the base layer and the protective layer is tighter, and it is easier to achieve full paving and prevent water leakage; at the same time, it softens, reinforces, increases viscosity, and disperses the rubber component in the waterproof coating system, so that each component in the waterproof coating can function more fully and the performance is better.

[0029] 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 emulsifier. Emulsifier is a key component for preparing water-based non-curing 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 cationic and nonionic emulsifiers. On the one hand, the composite emulsifier can improve the coagulation film and drying speed, and on the other hand, it can better match the high molecular polymer emulsion to avoid demulsification. The cationic emulsifier adopts a quaternary ammonium salt emulsifier, preferably octadecyl trimethyl ammonium chloride, and the nonionic emulsifier adopts an alkylphenol polyoxyethylene ether, preferably OP-10.

[0030] 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.

[0031] 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.

[0032] The present invention also provides a method for preparing a water-based non-curing rubber asphalt waterproof coating, comprising the following steps:

[0033] According to the mixing ratio, weigh the thermoplastic elastomer and add it to the compatibilizer, preferably heat it to 130°C-140°C and keep the temperature constant for 30 minutes until the thermoplastic elastomer is completely dissolved;

[0034] Adding asphalt and a tackifier to the mixture of step (1) in sequence for modification, the modification is preferably carried out by heating the mixture to 155-165°C, shearing the mixture at a speed of 1300-1500 r / min for 30-40 min at this temperature, then stopping the shearing, cooling the mixture to 135-145°C and keeping the temperature, to obtain modified asphalt;

[0035] Weigh water according to the ratio, and add high molecular polymer emulsion, emulsifier, stabilizer and coupling agent to the water in order, stir until the temperature rises to 55-61°C, until the emulsifier and stabilizer are dissolved and the whole system is evenly dispersed to obtain an emulsion;

[0036] Under the action of a colloid mill, the modified asphalt obtained in step (2) is added to the emulsion and mixed. After emulsification for 3-5 minutes, the mixture is cooled to room temperature to obtain a water-based non-curing rubber asphalt waterproof coating.

[0037] 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.

[0038] Example 1

[0039] A water-based non-curing rubber asphalt waterproof coating, comprising the following components by weight:

[0040] 50 parts of 70# asphalt, 20 parts of compatibilizer cyclohexane oil, 5 parts of modifier: SBS, 4 parts of SBR latex (converted to dry rubber), 3 parts of tackifier coumarone resin, 1.5 parts of di(diisooctylphosphoryl)methylhydroxyacetic acid titanate, 50 parts of water, 2 parts of octadecyltrimethylammonium chloride, 1 part of OP-10, and 0.2 parts of cationic polyacrylamide.

[0041] A method for preparing a water-based non-curing rubber asphalt waterproof coating, comprising:

[0042] (1) Weigh the corresponding amount of SBS according to the ratio and add it to the compatibilizer cyclohexane oil, heat it to 135°C, and keep the temperature constant for 30 minutes until the SBS is completely dissolved.

[0043] (2) Add corresponding amounts of asphalt and thickener coumarone resin to the mixture of step (1), raise the temperature to 160°C, shear at a speed of 1400 r / min for 35 min, then stop, cool to 140°C and maintain this temperature to obtain modified asphalt.

[0044] (3) Prepare emulsion. Weigh the corresponding mass fraction of water according to the ratio, and add SBR latex, nonionic emulsifier OP-10, cationic emulsifier octadecyltrimethylammonium chloride, stabilizer cationic polyacrylamide, coupling agent di(diisooctylphosphoryl)methylhydroxyacetic acid titanate into the water in order, stir and heat to 58°C until the emulsifier and stabilizer are dissolved and the whole system is evenly dispersed.

[0045] (4) Under the action of a colloid mill, the modified asphalt obtained in step (2) is added to the emulsion and mixed, and the mixture is discharged after emulsification for 3 minutes and cooled to room temperature to obtain the water-based non-curing rubber asphalt waterproof coating of the present invention.

[0046] Example 2

[0047] A water-based non-curing rubber asphalt waterproof coating comprises the following components by weight: 60 parts of 70# asphalt, 30 parts of compatibilizer cyclohexane oil, 8 parts of modifier SBS, 6 parts of SBR latex (converted into dry rubber), 5 parts of tackifier coumarone resin, 2.5 parts of di(diisooctylphosphoryl)methylhydroxyacetic acid titanate, 60 parts of water, 3 parts of octadecyltrimethylammonium chloride, 2 parts of OP-10, and 0.5 parts of cationic polyacrylamide.

[0048] The above-mentioned water-based non-curing rubber asphalt waterproof coating was prepared according to the preparation method of Example 1.

[0049] Example 3

[0050] A water-based non-curing rubber asphalt waterproof coating comprises the following components by weight: 55 parts of 70# asphalt, 25 parts of compatibilizer cyclohexane oil, 6.5 parts of modifier SBS, 5 parts of SBR latex (converted into dry rubber), 4 parts of tackifier coumarone resin, 2 parts of di(diisooctylphosphoryl)methylhydroxyacetic acid titanate, 55 parts of water, 2.5 parts of octadecyltrimethylammonium chloride, 1.5 parts of OP-10, and 0.4 parts of cationic polyacrylamide.

[0051] The above-mentioned water-based non-curing rubber asphalt waterproof coating was prepared according to the preparation method of Example 1.

[0052] Comparative Example:

[0053] At present, the raw materials commonly used to prepare hot-melt non-curing rubber asphalt are asphalt, compatibilizer, modifier, tackifier, and filler. The preparation process and conditions are as follows:

[0054] (1) Weigh the corresponding raw materials according to the proportion, and then heat the asphalt to 130-160°C;

[0055] (2) Add the compatibilizer and tackifier to the asphalt at 130-160°C and stir at a low speed for 20-30 minutes;

[0056] (3) Add modifiers, such as SBS and SBR, raise the temperature to 180-200°C, turn on the colloid mill, and stir for 1-2 hours until all the modifiers are melted;

[0057] (4) Maintaining the temperature at 160-180°C, add filler and stir for 30-50 minutes until the filler is evenly dispersed;

[0058] (5) Cooling down to 130-150°C and discharging the material, a hot-melt non-curing rubber asphalt waterproof coating can be obtained.

[0059] In hot melt non-curing rubber asphalt waterproof coating, fillers can improve the heat resistance of the coating, but the amount added must be controlled within a certain range, otherwise it will reduce the elongation and low temperature flexibility of the coating. In order to better compare the performance with water-soluble non-curing rubber asphalt waterproof coating, no fillers are added in the following comparative examples.

[0060] Comparative Example 1

[0061] A hot-melt non-curing rubber asphalt waterproof coating comprises the following components by weight: 50 parts of 70# asphalt, 20 parts of compatibilizer cyclohexane oil, 5 parts of modifier SBS, 4 parts of SBR; and 3 parts of coumarone resin as a tackifier.

[0062] The preparation method of hot-melt non-curing rubber asphalt is as follows:

[0063] (1) Weigh the corresponding raw materials according to the proportion, and then heat the asphalt to 145°C;

[0064] (2) Add the compatibilizer cyclohexane oil and the tackifier coumarone resin to the asphalt at 145°C and stir at a low speed for 25 minutes;

[0065] (3) Add modifiers SBS and SBR, raise the temperature to 190°C, start the colloid mill, and stir for 1.5 hours until all the modifiers are melted;

[0066] (4) Maintaining the temperature at 170°C, add filler and stir for 40 minutes until the filler is evenly dispersed;

[0067] (5) Cooling down to 140°C and discharging the material, a hot-melt non-curing rubber asphalt waterproof coating can be obtained.

[0068] Comparative Example 2

[0069] A water-based non-curing rubber asphalt waterproof coating comprises the following components by weight: 60 parts of asphalt, 30 parts of compatibilizer cyclohexane oil, and modifiers: 8 parts of SBS and 6 parts of SBR.

[0070] The preparation method of Comparative Example 2 is the same as that of Comparative Example 1.

[0071] After the water in the water-based non-curing rubber asphalt waterproof coating of the present invention is completely evaporated, a performance test is performed and compared with a comparative example. The results are shown in Table 1.

[0072] Test results of two types of non-curing rubber asphalt waterproof coatings:

[0073]

[0074]

[0075] It can be seen from the test results of the above embodiments and comparative examples that the water-based non-curing rubber asphalt waterproof coating prepared by the present invention meets the index requirements, and compared with the hot-melt non-curing rubber asphalt waterproof coating, it has better extensibility and low construction temperature, and is more friendly to people and the environment.

[0076] 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 non-curing rubber asphalt waterproof coating, characterized in that: The invention comprises the following raw materials in parts by weight: 50-60 parts of asphalt, 20-30 parts of compatibilizer, 9-14 parts of modifier, 3-5 parts of tackifier, 1.5-2.5 parts of coupling agent, 50-60 parts of water, 3-5 parts of emulsifier and 0.2-0.5 parts of stabilizer; the modifier is thermoplastic elastomer and high molecular polymer emulsion.

2. The water-based non-curing rubber asphalt waterproof coating according to claim 1, characterized in that: The thermoplastic elastomer includes one or a mixture of SBS, SIS, SEBS, SEPS or CPE, and the high molecular polymer emulsion includes one or a mixture of styrene-butadiene latex, chloroprene latex, nitrile latex, acrylic emulsion, styrene-acrylic emulsion or ethylene-vinyl acetate emulsion.

3. The water-based non-curing rubber asphalt waterproof coating according to claim 1, characterized in that: The modifier comprises 5-8 parts of SBS and 4-6 parts of SBR.

4. The water-based non-curing rubber asphalt waterproof coating according to claim 1, characterized in that: The compatibilizer is one or a mixture of catalytic cracking oil slurry, aromatic oil, naphthenic oil or reduced line oil.

5. The water-based non-curing rubber asphalt waterproof coating according to claim 1, characterized in that: The tackifier comprises one or a mixture of coumarone resin, terpene resin, rosin resin, C5 petroleum resin or C9 petroleum resin.

6. The water-based non-curing rubber asphalt waterproof coating according to claim 1, characterized in that: The coupling agent is di(diisooctylphosphoryl)methylhydroxyacetic acid titanate.

7. The water-based non-curing rubber asphalt waterproof coating according to claim 1, characterized in that: The emulsifiers are cationic and nonionic emulsifiers.

8. The water-based non-curing rubber asphalt waterproof coating according to claim 7, characterized in that: The cationic emulsifier is octadecyltrimethylammonium chloride, and the nonionic emulsifier is OP-10.

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

10. The method for preparing a water-based non-curing rubber asphalt waterproof coating according to claim 1, characterized in that: The steps include: (1) According to the mixing ratio, weigh the thermoplastic elastomer and add it to the compatibilizer, and heat it until the thermoplastic elastomer is completely dissolved; (2) adding asphalt and a tackifier to the mixture of step (1) in sequence for modification to obtain modified asphalt; (3) Weighing water according to the ratio, and adding the high molecular polymer emulsion, emulsifier, stabilizer, and coupling agent to the water in order, stirring until dissolved, to obtain an emulsion; (4) Under the action of a colloid mill, the modified asphalt obtained in step (2) is added to the emulsion for mixing and emulsification to obtain a water-based non-curing rubber asphalt waterproof coating.

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