Environment-friendly solvent type asphalt emulsion and preparation method thereof

Abstract

The application is an environment-friendly solvent type asphalt emulsion and a preparation method thereof. The environment-friendly solvent type asphalt emulsion comprises the following components and weight fractions: 70# base asphalt 80-100 parts, composite solvent 60-80 parts, thermoplastic elastomer modifier 16-20 parts, and tackifier 10-12 parts. The preparation steps are as follows: the composite solvent is heated to 60-80 DEG C in a water bath, and the 60 DEG C viscous 70# base asphalt and the composite solvent are dissolved together by a shearing machine to obtain an asphalt solution; the thermoplastic elastomer modifier and the tackifier are sequentially added to the heated composite solvent, and are mixed and stirred by the shearing machine to obtain an additive solution; the asphalt solution and the additive solution are heated to 60-80 DEG C in a water bath, and are mixed and stirred by the shearing machine to obtain the solvent type asphalt emulsion, which is cooled and sealed. The asphalt emulsion has the advantages of fast film forming speed, outstanding waterproof effect, good high and low temperature performance, and no toxicity and pollution.

Description

Technical Field

[0001] This invention relates to the technical field of waterproof substrate interface treatment materials, and in particular to an environmentally friendly solvent-based asphalt emulsion and its preparation method. Background Technology

[0002] Solvent-based asphalt emulsions are commonly used for interface treatment before laying waterproof membranes or applying waterproof coatings. They are a frequently used primer in engineering projects, often applied as the base coat at room temperature, hence the name "cold primer." Solvent-based asphalt emulsions have low viscosity and good fluidity. When applied to concrete, mortar, or wood substrates, they quickly penetrate the pores of the substrate. After the solvent evaporates, they bond firmly to the substrate. This not only removes surface dust and provides a clean base for the waterproofing layer, but also seals the substrate and increases the adhesion between the waterproofing layer and the substrate.

[0003] Existing solvent-based primers often use xylene as a solvent for asphalt, which not only contains toxic and carcinogenic components, but also greatly pollutes the local environment. Furthermore, it is easily affected by the season and construction conditions, resulting in poor material bonding strength. Summary of the Invention

[0004] The present invention aims to overcome the shortcomings of the prior art and provide an environmentally friendly solvent-based asphalt emulsion and its preparation method.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An environmentally friendly solvent-based asphalt emulsion, comprising the following components and weight parts: 80-100 parts of 70# base asphalt, 60-80 parts of composite solvent, 16-20 parts of thermoplastic elastomer modifier, and 10-12 parts of tackifier.

[0007] The composite solvent is a mixture of turpentine oil and 1,2-propylene glycol, with the mass ratio of turpentine oil to 1,2-propylene glycol being 4:6, 5:5, or 6:4.

[0008] The thermoplastic elastomer modifier is SBS5516, SBS3501, or SBS3540.

[0009] The thickener is polydicyclopentadiene, acetylic acid citrate, or synthetic plant ester.

[0010] The specific steps of the above-mentioned environmentally friendly solvent-based asphalt emulsion preparation method are as follows:

[0011] S1. Preparation of asphalt solution:

[0012] The composite solvent is heated to 60-80℃ in a water bath, and the 70# base asphalt, which is viscous at 60℃, and the composite solvent are dissolved together by a shearing machine to obtain an asphalt solution.

[0013] S2. Preparation of additive solution:

[0014] The composite solvent is heated to a specified temperature in a water bath. The thermoplastic elastomer modifier and tackifier are then added to the heated composite solvent in sequence and mixed and stirred using a shearing machine to obtain an additive solution.

[0015] S3. Preparation and storage of solvent-based asphalt emulsions:

[0016] The asphalt solution and additive solution are heated to 60-80℃ in a water bath and mixed using a shear mixer to obtain a solvent-based asphalt emulsion. The emulsion is then stirred with a glass rod until it cools to room temperature and is poured into a sealed container to prevent solvent evaporation and impurity intrusion.

[0017] In step S1, to ensure the stability of the prepared asphalt solution, the shearing machine needs to be cleaned with a composite solvent heated in a water bath before preparation.

[0018] The beneficial effects of this invention are: the solvent-based asphalt emulsion of this invention has a fast film-forming speed, outstanding waterproof effect, good high and low temperature performance, and is non-toxic and non-polluting, belonging to an environmentally friendly waterproof material suitable for harsh environments. Detailed Implementation

[0019] The principles and features of the present invention are described below with reference to specific embodiments. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. The advantages and features of the present invention will become clearer from the following description.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] The present invention will be further described below with reference to specific embodiments:

[0022] An environmentally friendly solvent-based asphalt emulsion, comprising the following components and weight parts: 80-100 parts of 70# base asphalt, 60-80 parts of composite solvent, 16-20 parts of thermoplastic elastomer modifier, and 10-12 parts of tackifier.

[0023] The composite solvent is a mixture of turpentine oil and 1,2-propylene glycol, with the mass ratio of turpentine oil to 1,2-propylene glycol being 4:6, 5:5, or 6:4.

[0024] The thermoplastic elastomer modifier is SBS5516, SBS3501, or SBS3540.

[0025] The thickener is polydicyclopentadiene, acetylic acid citrate, or synthetic plant ester.

[0026] The specific steps of the above-mentioned environmentally friendly solvent-based asphalt emulsion preparation method are as follows:

[0027] S1. Preparation of asphalt solution:

[0028] The composite solvent is heated to 60-80℃ in a water bath, and the 70# base asphalt, which is viscous at 60℃, and the composite solvent are dissolved together through a shearing machine. In order to ensure the stability of the prepared asphalt solution, the shearing machine needs to be cleaned with the composite solvent heated in a water bath before preparation to obtain the asphalt solution.

[0029] S2. Preparation of additive solution:

[0030] The composite solvent is heated to a specified temperature in a water bath. The thermoplastic elastomer modifier and tackifier are then added to the heated composite solvent in sequence and mixed and stirred using a shearing machine to obtain an additive solution.

[0031] S3. Preparation and storage of solvent-based asphalt emulsions:

[0032] The asphalt solution and additive solution are heated to 60-80℃ in a water bath and mixed using a shear mixer to obtain a solvent-based asphalt emulsion. The emulsion is then stirred with a glass rod until it cools to room temperature and is poured into a sealed container to prevent solvent evaporation and impurity intrusion.

[0033] The basic technical indicators of 70# base asphalt are shown in Table 1, and the technical indicators of linear SBS used in the thermoplastic elastomer modifier are shown in Table 2.

[0034] Table 170# Base Asphalt Basic Technical Indicators

[0035]

[0036] Table 2 Linear SBS Technical Indicators

[0037]

[0038] Specific Implementation Example 1:

[0040] An environmentally friendly solvent-based asphalt emulsion is formulated from the following components in parts by weight: 80 parts of 70# base asphalt, 60 parts of composite solvent, 20 parts of thermoplastic elastomer modifier, and 10 parts of tackifier.

[0041] The composite solvent is a mixture of turpentine and 1,2-propylene glycol in a mass ratio of 4:6; the thermoplastic elastomer modifier is SBS5516; and the tackifier is polydicyclopentadiene.

[0042] The preparation methods are as follows: S1. Preparation of asphalt solution: The composite solvent is heated to 60-80℃ in a water bath, and 70# base asphalt, which is viscous at 60℃, and the composite solvent are dissolved together through a shearing machine. To ensure the stability of the prepared asphalt solution, the shearing machine needs to be cleaned with the composite solvent heated in a water bath before preparation. S2. Preparation of additive solution: The composite solvent is heated to a specified temperature in a water bath, and the thermoplastic elastomer modifier and tackifier are added to the heated composite solvent in sequence. The mixture is stirred through a shearing machine to obtain the additive solution. S3. Preparation and storage of solvent-based asphalt emulsion: The asphalt solution and additive solution are heated to 60-80℃ in a water bath and stirred through a shearing machine to obtain the solvent-based asphalt emulsion. The mixture is stirred with a glass rod until it cools to room temperature, and then poured into a sealed container to prevent solvent evaporation and impurity intrusion. Specific Implementation Example 2:

[0044] An environmentally friendly solvent-based asphalt emulsion is formulated from the following components in parts by weight: 80 parts of 70# base asphalt, 60 parts of composite solvent, 16 parts of thermoplastic elastomer modifier, and 12 parts of tackifier.

[0045] The composite solvent is a mixture of turpentine and 1,2-propylene glycol in a mass ratio of 4:6; the thermoplastic elastomer modifier is SBS3501; and the tackifier is polydicyclopentadiene.

[0046] The preparation method is the same as in Specific Example 1. Specific Implementation Example 3:

[0048] An environmentally friendly solvent-based asphalt emulsion is formulated from the following components in parts by weight: 90 parts of 70# base asphalt, 70 parts of composite solvent, 20 parts of thermoplastic elastomer modifier, and 10 parts of tackifier.

[0049] The composite solvent is a mixture of turpentine and 1,2-propylene glycol in a mass ratio of 5:5; the thermoplastic elastomer modifier is SBS3540; and the tackifier is acetylic acid citrate.

[0050] The preparation method is the same as in Specific Example 1. Specific Implementation Example 4:

[0052] An environmentally friendly solvent-based asphalt emulsion is formulated from the following components in parts by weight: 90 parts of 70# base asphalt, 70 parts of composite solvent, 16 parts of thermoplastic elastomer modifier, and 12 parts of tackifier.

[0053] The composite solvent is a mixture of turpentine and 1,2-propylene glycol in a mass ratio of 5:5; the thermoplastic elastomer modifier is SBS5516; and the tackifier is acetylic acid citrate.

[0054] The preparation method is the same as in Specific Example 1. Specific Implementation Example 5:

[0056] An environmentally friendly solvent-based asphalt emulsion is formulated from the following components in parts by weight: 100 parts of 70# base asphalt, 80 parts of composite solvent, 20 parts of thermoplastic elastomer modifier, and 10 parts of tackifier.

[0057] The composite solvent is a mixture of turpentine and 1,2-propylene glycol in a mass ratio of 6:4; the thermoplastic elastomer modifier is SBS3501; and the tackifier is a synthetic plant ester.

[0058] The preparation method is the same as in Specific Example 1. Specific Implementation Example 6:

[0060] An environmentally friendly solvent-based asphalt emulsion is formulated from the following components in parts by weight: 100 parts of 70# base asphalt, 80 parts of composite solvent, 16 parts of thermoplastic elastomer modifier, and 12 parts of tackifier.

[0061] The composite solvent is a mixture of turpentine and 1,2-propylene glycol in a mass ratio of 6:4; the thermoplastic elastomer modifier is SBS3540; and the tackifier is a synthetic plant ester.

[0062] The preparation method is the same as in Specific Example 1.

[0063] According to JT / T 983-2015 "Soluble-based Asphalt Waterproof Adhesive Coatings for Roads and Bridges", the solvent-based asphalt emulsions prepared in Examples 1-6 were subjected to low-temperature flexibility tests at -10℃, high-temperature heat resistance tests at 120℃, and corrosion resistance tests at 20% chemically pure NaCl solution. The test results are shown in Table 3.

[0064] Table 3. Performance test results of solvent-based asphalt emulsions prepared in specific Examples 1-6

[0065] serial number Specific Examples 1-6 Low temperature flexibility No cracks or breaks High temperature heat resistance No sliding, flowing, or dripping. Corrosion resistance (salt treatment) No wrinkles, bubbles, or peeling

[0066] Referring to JT / T 983-2015 "Soluble-based Asphalt Waterproofing and Adhesive Coatings for Roads and Bridges" and based on actual field engineering conditions, the drying time of the solvent-based asphalt emulsions prepared in Specific Examples 1-6 was tested. The test results are shown in Table 4.

[0067] Table 4. Drying time test results of solvent-based asphalt emulsions prepared in specific Examples 1-6.

[0068]

[0069] According to GB / T 16777-2008 "Test Methods for Waterproof Coatings for Buildings", the solvent-based asphalt emulsions prepared in Examples 1-6 were subjected to pull-out tests and impermeability tests. The test results are shown in Table 5.

[0070] Table 5. Results of tensile strength and impermeability tests of solvent-based asphalt emulsions prepared in specific examples 1-6.

[0071]

[0072] Referring to JT / T 983-2015 "Soluble-based Asphalt Waterproof Adhesive Coatings for Roads and Bridges", the temperature performance test method is as follows: three temperature conditions are set, and the coating amount is 0.4 kg / m². 3 Composite specimens were prepared and subjected to three different temperature conditions for four hours each before tensile and shear strength testing. The freeze-thaw strength loss test method was as follows: the composite specimens were first vacuum-saturated with asphalt to absorb water. The saturated specimens were then sealed and placed in a -18℃ freezer for 24 hours. Afterward, the specimens were removed and placed in a 25℃ constant-temperature water bath to thaw and absorb water. The tensile and shear strength loss rates of the specimens after freeze-thaw were then tested. The test results are shown in Table 6.

[0073] Table 6. Test results of tensile strength and shear strength loss rate of specimens.

[0074]

[0075] The solvent-based asphalt emulsion of the present invention has excellent working performance, which is significantly better than that of existing solvent-based asphalt emulsions. It not only has the advantages of fast drying speed, excellent flow properties and good durability, but also has the characteristics of high storage stability and small viscosity difference before and after storage.

[0076] The solvent-based asphalt emulsion of the present invention has high bonding strength and low coefficient of thermal expansion, making it easy to form a stable integral structure with the base layer and waterproof layer. At the same time, it also has certain strength and flexibility under adverse conditions such as heavy traffic and various high and low temperature environments, which can greatly reduce the damage caused by weak adhesion of the waterproof layer, such as slippage, swelling and cracking of the adhesive layer.

[0077] The solvent-based asphalt emulsion of this invention differs from commonly used base treatment agents. It is not only non-toxic and harmless, but also environmentally friendly and does not pollute the environment.

[0078] The present invention has been described above with reference to specific embodiments. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any improvements made using the inventive concept and technical solution of the present invention, or direct application to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A method for preparing an environmentally friendly solvent-based asphalt emulsion, characterized in that, The environmentally friendly solvent-based asphalt emulsion comprises the following components and weight percentages: 80-100 parts of 70# base asphalt, 60-80 parts of composite solvent, 16-20 parts of thermoplastic elastomer modifier, and 10-12 parts of tackifier; the composite solvent is a mixture of turpentine and 1,2-propylene glycol, wherein the mass ratio of turpentine to 1,2-propylene glycol is 4:6, 5:5, or 6:4; the tackifier is polydicyclopentadiene, acetylsic acid citrate, or synthetic vegetable ester. The specific preparation steps are as follows: S1. Preparation of asphalt solution: The composite solvent is heated to 60-80℃ in a water bath, and the 70# base asphalt, which is viscous at 60℃, and the composite solvent are dissolved together by a shearing machine to obtain an asphalt solution. S2. Preparation of additive solution: The composite solvent is heated to a specified temperature in a water bath. The thermoplastic elastomer modifier and tackifier are then added to the heated composite solvent in sequence and mixed and stirred using a shearing machine to obtain an additive solution. S3. Preparation and storage of solvent-based asphalt emulsions: The asphalt solution and additive solution are heated to 60-80℃ in a water bath and mixed using a shear mixer to obtain a solvent-based asphalt emulsion. The emulsion is then stirred with a glass rod until it cools to room temperature and is poured into a sealed container to prevent solvent evaporation and impurity intrusion.

2. The method for preparing an environmentally friendly solvent-based asphalt emulsion according to claim 1, characterized in that, The thermoplastic elastomer modifier is SBS5516, SBS3501, or SBS3540.

3. The method for preparing an environmentally friendly solvent-based asphalt emulsion according to claim 1, characterized in that, In step S1, to ensure the stability of the prepared asphalt solution, the shearing machine needs to be cleaned with a composite solvent heated in a water bath before preparation.

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