Rubber asphalt waterproof coating and preparation method thereof

Abstract

The invention discloses a rubber asphalt waterproof coating and a preparation method thereof. The preparation method comprises the following steps: (1) respectively preparing an asphalt mixture and an SBS dispersion liquid; the preparation method comprises the following steps: uniformly mixing the matrix asphalt and the vacuum line oil, then adding the high-temperature additive, uniformly mixing, finally adding the filler, and uniformly mixing to obtain an asphalt mixture; the preparation method comprises the following steps: uniformly dispersing a styrene-butadiene-styrene block copolymer in a solvent to obtain an SBS dispersion liquid; and (2) uniformly mixing the asphalt mixture and the SBS dispersion liquid, then adding the activating agent, and uniformly mixing to obtain the rubber asphalt waterproof coating. The rubber asphalt waterproof coating is prepared by a low-temperature modification process through a cylinder separation method, and the activator is used cooperatively, so that the prepared waterproof coating is more uniform and more thorough in dissolution and dispersion of SBS (styrene butadiene styrene) in asphalt compared with an original process.

Description

Technical Field

[0001] The present invention belongs to the technical field of waterproof coatings, and more specifically, relates to a rubber asphalt waterproof coating and a preparation method thereof. Background Art

[0002] Rubber asphalt waterproof coating is a black viscous liquid waterproof coating made of high-quality petroleum asphalt as the base material and polymer rubber as the modifier, which is prepared by solvent dissolution. Rubber asphalt waterproof coating is a modified asphalt waterproof coating commonly used in the building waterproofing industry. It is widely used in waterproof parts such as roofs, basements, garage roofs, engineering foundations, etc. It is used in combination with waterproof membranes to form an excellent waterproof system. Its advantages are: the construction process is convenient and simple, it can be sprayed or scraped, the film forming speed is fast, and it can be constructed below 0℃. At the same time, the product has excellent high and low temperature performance, strong weather resistance, acid resistance, strong crack resistance and other characteristics, which are widely recognized by the waterproofing industry.

[0003] Nowadays, most production processes of rubber asphalt waterproof coatings use SBS (styrene-butadiene-styrene block copolymer) to modify asphalt to prepare modified asphalt, and then dilute and compound with solvent to obtain the finished product. The disadvantages of this process are: the temperature of petroleum asphalt swelling SBS must be 170-195℃ to ensure the effective swelling of SBS. At the same time, in order to ensure the excellent high and low temperature performance of the product, a large amount of SBS modifier must be added to modify the asphalt, which will inevitably lead to a longer swelling time of SBS. Moreover, since the swelling temperature of SBS is higher than the boiling point of the solvent, there is a safety risk of solvent boiling in the batching tank during the dilution process of adding solvent; at the same time, the addition of too much SBS modifier will increase the viscosity of the modified asphalt, and the dissolution and dilution process requires more solvent for dilution and dispersion, which increases the VOC content of the product.

[0004] Therefore, how to reduce the dissolution temperature and time of SBS, shorten the production batching time, reduce energy consumption and safety risks, and at the same time ensure the complete and effective modification of SBS and the excellent high and low temperature performance of the product is a technical problem that needs to be solved urgently. Summary of the invention

[0005] The purpose of the present invention is to provide a rubber asphalt waterproof coating and a preparation method thereof. The preparation method of the present invention reduces the temperature and time of asphalt modification, reduces production safety risks, and enables the prepared rubber asphalt waterproof coating to have excellent high and low temperature properties.

[0006] In order to achieve the above object, one aspect of the present invention provides a method for preparing a rubber asphalt waterproof coating, the preparation method comprising:

[0007] (1) Prepare asphalt mixture and SBS dispersion separately;

[0008] The base asphalt and the line-cutting oil are mixed evenly, and then the high-temperature additive is added and mixed evenly, and finally the filler is added and mixed evenly to obtain the asphalt mixture;

[0009] Dispersing the styrene-butadiene-styrene block copolymer uniformly in a solvent to obtain the SBS dispersion;

[0010] (2) The asphalt mixture and the SBS dispersion are mixed evenly, and then an activator is added and mixed evenly to obtain the rubber asphalt waterproof coating.

[0011] The present invention adopts the solvent dilution and dispersion SBS technology: all SBS is added into the solvent, and the SBS is uniformly dissolved and dispersed in the solvent by stirring at room temperature, thereby increasing the proportion of SBS active groups in the solvent and facilitating the modification of asphalt.

[0012] The present invention adopts the technology of activating SBS with an activator: adding other prepared components into the SBS dispersion, stirring and mixing at 90-120° C. for 5-60 minutes, adding the activator after dilution and mixing evenly, stirring and mixing at 90-120° C. for 30-120 minutes, activating the SBS with the activator at high temperature, so that the SBS is fully and effectively activated, and at the same time, the SBS molecules quickly modify the molten asphalt molecules, so that compared with the original process, the SBS is more evenly dispersed in the asphalt and the modification is more complete.

[0013] According to the present invention, preferably, in step (1), the mixing temperature of the base asphalt and the line cut oil is 120-135°C and the time is 1-30min;

[0014] Add the high temperature auxiliary agent, the mixing temperature is 100-135°C, and the time is 1-30min;

[0015] The filler is added, and the mixing temperature is 100-135° C. and the mixing time is 30-180 min.

[0016] According to the present invention, preferably, in step (1), the time for dispersing the styrene-butadiene-styrene block copolymer in the solvent is 30-180 min.

[0017] According to the present invention, preferably, in step (2), the temperature of mixing the asphalt mixture and the SBS dispersion is 90-120° C. and the time is 5-60 min;

[0018] The activator is added, and the mixing temperature is 90-120° C. and the mixing time is 30-120 min.

[0019] The invention adopts a low-temperature modification process for preparation, and its process innovation is: the temperature of the SBS modified petroleum asphalt in the original process is reduced from 130-135°C to 90-120°C, the modification time is reduced from the original 4-6h to 1.5-2.5h, and the risk factor of solvent boiling is reduced.

[0020] According to the present invention, preferably, in parts by weight, the amount of the base asphalt is 205-225 parts, the amount of the wire-cutting oil is 25-35 parts, the amount of the high-temperature additive is 3.1-4 parts, the amount of the filler is 50-70 parts, the amount of the styrene-butadiene-styrene block copolymer is 30-35 parts, the amount of the solvent is 150-170 parts and the amount of the activator is 0.25-0.75 parts.

[0021] According to the present invention, preferably, the matrix asphalt is selected from 70# petroleum asphalt and / or 90# petroleum asphalt;

[0022] The line-reducing oil is selected from at least one of line-reducing oil, line-reducing oil and aromatic oil;

[0023] The high temperature additive is selected from at least one of polyethylene wax, C9 petroleum resin and polypropylene;

[0024] The filler is selected from at least one of light calcium powder, heavy calcium powder, talcum powder and titanium dioxide.

[0025] According to the present invention, preferably, the styrene-butadiene-styrene block copolymer is selected from at least one of linear SBS Yanhua 1401, star-shaped SBS Yueyang Petrochemical 813 and star-shaped SBS Baling Petrochemical 803;

[0026] The solvent is selected from at least one of xylene, 120# solvent oil, 140# solvent oil and 200# solvent oil.

[0027] According to the present invention, preferably, the activator is selected from alkylphenol disulfide and / or alkylphenol monosulfide.

[0028] According to the present invention, preferably, the activator is selected from alkylphenol disulfide and alkylphenol monosulfide, and the mass ratio of the alkylphenol disulfide to the alkylphenol monosulfide is (1-3):1.

[0029] Another aspect of the present invention provides a rubber asphalt waterproof coating prepared by the above preparation method.

[0030] The technical solution of the present invention has the following beneficial effects:

[0031] (1) The present invention realizes the preparation of rubber asphalt waterproof coating by low-temperature modification process through the cylinder separation method, and uses an activator in combination, so that the prepared waterproof coating is more uniformly and thoroughly dissolved and dispersed in asphalt than the original process SBS.

[0032] (2) The present invention innovatively adds an activator component. By adding the activator, the SBS is fully and effectively activated. At the same time, the SBS molecules quickly modify the molten asphalt molecules, significantly improving the high and low temperature performance of the product.

[0033] (3) The preparation method of the present invention reduces the modification temperature of petroleum asphalt from 130-135°C in the original process to 90-120°C. The reduction of the modification temperature reduces the risk factor of solvent boiling and reduces production safety risks.

[0034] (4) The preparation method of the present invention reduces the modification time of petroleum asphalt from the original 4-6 hours to 1.5-2.5 hours, thereby reducing production energy consumption and carbon emissions.

[0035] (5) The present invention reduces the amount of solvent added by optimizing the formula and process, thereby reducing the VOC content of the product, significantly improving the environmental protection effect of the product, and being more environmentally friendly.

[0036] Other features and advantages of the present invention will be described in detail in the following detailed description. DETAILED DESCRIPTION

[0037] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0038] The present invention is further described below by examples:

[0039] In the following embodiments and comparative examples:

[0040] The SBS 813 used is a star-type SBS, specifically Yueyang Petrochemical 813;

[0041] The polyethylene wax used was purchased from KMF, with the brand name PMA-Z01-KMF;

[0042] The particle size of the light calcium powder used is 600 mesh;

[0043] The alkylphenol monosulfide used was purchased from Anhui Ruida Rubber Technology Co., Ltd., with the brand name A850;

[0044] The alkylphenol disulfide used was purchased from Anhui Ruida Rubber Technology Co., Ltd. with the brand name WAA-303.

[0045] Example 1

[0046] (1) Preparation of asphalt mixture: 214 parts by weight of 70# petroleum asphalt and 30 parts by weight of reduced third-line oil are added to an asphalt tank, heated to 130°C and stirred for 15 minutes; 3.5 parts by weight of polyethylene wax are added to an asphalt tank, and the temperature is controlled at 130°C and stirred for 10 minutes; 60 parts by weight of light calcium powder are added to an asphalt tank, and the temperature is controlled at 120°C and stirred for 120 minutes to mix evenly, to obtain the asphalt mixture, and then dilution is prepared;

[0047] (2) Preparation of SBS dispersion: 160 parts by weight of xylene and 32 parts by weight of SBS813 were added to a solvent tank, and the mixture was stirred at room temperature for 90 minutes without heating to obtain the SBS dispersion. This process can be carried out simultaneously with the preparation of the asphalt mixture.

[0048] (3) Asphalt modification: Add 307.5 parts by weight of asphalt mixture into a solvent tank containing 192 parts by weight of SBS dispersion, and stir and mix at 115°C for 30 minutes. Add 0.6 parts by weight of alkylphenol monosulfide into the solvent tank, and stir and mix at 115°C for 60 minutes. After dilution and mixing, cool to 70°C, package and discharge.

[0049] Example 2

[0050] The difference between this embodiment and embodiment 1 is only step (3), which is as follows: 307.5 parts by weight of asphalt mixture is added to 192 parts by weight of SBS dispersion, the mixture is stirred and mixed at 115°C for 30 minutes, 0.2 parts by weight of alkylphenol disulfide and 0.1 parts by weight of alkylphenol monosulfide are added to a solvent tank, the mixture is stirred and mixed at 115°C for 60 minutes, the mixture is diluted and mixed evenly, and the temperature is lowered to 70°C before packaging and discharging.

[0051] Example 3

[0052] The difference between this embodiment and embodiment 1 is only step (3), which is as follows: 307.5 parts by weight of asphalt mixture is added to 192 parts by weight of SBS dispersion, the mixture is stirred and mixed at 115°C for 30 minutes, 0.4 parts by weight of alkylphenol disulfide and 0.2 parts by weight of alkylphenol monosulfide are added to a solvent tank, the mixture is stirred and mixed at 115°C for 60 minutes, the mixture is diluted and mixed evenly, the temperature is lowered to 70°C, and the mixture is packaged and discharged.

[0053] Example 4

[0054] The difference between this embodiment and embodiment 1 is only step (3), which is as follows: 307.5 parts by weight of asphalt mixture is added to 192 parts by weight of SBS dispersion, the mixture is stirred and mixed at 115°C for 30 minutes, 0.6 parts by weight of alkylphenol disulfide and 0.3 parts by weight of alkylphenol monosulfide are added to a solvent tank, the mixture is stirred and mixed at 115°C for 60 minutes, the mixture is diluted and mixed evenly, the temperature is lowered to 70°C, and the mixture is packaged and discharged.

[0055] Comparative Example 1

[0056] The difference between this comparative example and Example 1 is only step (3), which is: adding 307.5 parts by weight of asphalt mixture into a solvent tank containing 192 parts by weight of SBS dispersion, stirring and mixing at 115°C for 90 minutes, diluting and mixing evenly, cooling to 70°C, packaging and discharging the material.

[0057] Comparative Example 2

[0058] Add 214 parts by weight of 70# petroleum asphalt and 30 parts by weight of reduced third-line oil into an asphalt tank, heat to 130°C and stir for 15 minutes; add 3.5 parts by weight of polyethylene wax and 32 parts by weight of SBS813 into an asphalt tank, control the temperature at 132°C and stir for 60 minutes; add 160 parts by weight of xylene, stir for 120 minutes without heating; add 60 parts by weight of light calcium, stir for 60 minutes without heating, dilute and mix evenly, then cool to 70°C and package and discharge.

[0059] Test Case

[0060] The waterproof coatings prepared in the above embodiments and comparative examples were subjected to performance tests according to Q / SY YHF 0108-2017, and the specific test results are shown in the table below.

[0061] Table 1

[0062]

[0063] From the above test results, it can be seen that the solid content of the waterproof coating prepared in Examples 1-4 is 70.6-71.5%, and all aspects of product performance meet and exceed the enterprise standard. The performance of Example 3 is the best, indicating that the compounding ratio of the activator is optimal; in the preparation method of this scheme, the modification temperature is concentrated in 90-120°C, and the modification time is concentrated in 50-90min.

[0064] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A method for preparing a rubber asphalt waterproof coating, characterized in that: The preparation method comprises: (1) Prepare asphalt mixture and SBS dispersion separately; The base asphalt and the line-cutting oil are mixed evenly, and then the high-temperature additive is added and mixed evenly, and finally the filler is added and mixed evenly to obtain the asphalt mixture; Dispersing the styrene-butadiene-styrene block copolymer uniformly in a solvent to obtain the SBS dispersion; (2) The asphalt mixture and the SBS dispersion are mixed evenly, and then an activator is added and mixed evenly to obtain the rubber asphalt waterproof coating.

2. The preparation method according to claim 1, wherein In step (1), the mixing temperature of the base asphalt and the line-cutting oil is 120-135° C. and the mixing time is 1-30 min; Add the high temperature auxiliary agent, the mixing temperature is 100-135°C, and the time is 1-30min; The filler is added, and the mixing temperature is 100-135° C. and the mixing time is 30-180 min.

3. The preparation method according to claim 1, wherein In step (1), the styrene-butadiene-styrene block copolymer is dispersed in the solvent for 30-180 minutes.

4. The preparation method according to claim 1, wherein In step (2), the temperature of mixing the asphalt mixture and the SBS dispersion is 90-120° C. and the time is 5-60 min; The activator is added, and the mixing temperature is 90-120° C. and the mixing time is 30-120 min.

5. The preparation method according to claim 1, wherein In parts by weight, the amount of the base asphalt is 205-225 parts, the amount of the wire-cutting oil is 25-35 parts, the amount of the high-temperature additive is 3.1-4 parts, the amount of the filler is 50-70 parts, the amount of the styrene-butadiene-styrene block copolymer is 30-35 parts, the amount of the solvent is 150-170 parts and the amount of the activator is 0.25-0.75 parts.

6. The preparation method according to claim 1, wherein The matrix asphalt is selected from 70# petroleum asphalt and / or 90# petroleum asphalt; The line-reducing oil is selected from at least one of line-reducing oil, line-reducing oil and aromatic oil; The high temperature additive is selected from at least one of polyethylene wax, C9 petroleum resin and polypropylene; The filler is selected from at least one of light calcium powder, heavy calcium powder, talcum powder and titanium dioxide.

7. The preparation method according to claim 1, wherein The styrene-butadiene-styrene block copolymer is selected from at least one of linear SBS Yanhua 1401, star-shaped SBS Yueyang Petrochemical 813 and star-shaped SBS Baling Petrochemical 803; The solvent is selected from at least one of xylene, 120# solvent oil, 140# solvent oil and 200# solvent oil.

8. The preparation method according to claim 1, wherein The activator is selected from alkylphenol disulfide and / or alkylphenol monosulfide.

9. The preparation method according to claim 8, wherein: The activator is selected from alkylphenol disulfide and alkylphenol monosulfide, and the mass ratio of the alkylphenol disulfide to the alkylphenol monosulfide is (1-3):

1.

10. A rubber asphalt waterproof coating prepared by the preparation method according to any one of claims 1 to 9.

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