Asphalt waterproof coiled material and preparation method thereof

Abstract

The present invention discloses an asphalt waterproof coiled material and a preparation method thereof, the asphalt waterproof coiled material comprises an asphalt layer formed by coating an asphalt mixture on a base, the asphalt mixture comprises, by weight, 40-70% of petroleum asphalt, 25-50% of a filler and 7-12% of a modifier, and the modifier comprises styrene butadiene rubber and polyethylene wax; the asphalt mixture does not include engine oil. The specific modifier is adopted to modify the asphalt, the obtained coiled material has excellent high and low temperature performance and storage stability, meanwhile, the modifier is moderate in viscosity, small in mixing amount and easy to disperse, engine oil and grinding equipment do not need to be used in the production of the asphalt waterproof coiled material, oil smoke emission is greatly reduced, and energy conservation, environmental protection and process simplification are facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of modifiers, and in particular to an asphalt waterproofing coiled material and a preparation method thereof. Background Art

[0002] In recent years, my country's building waterproofing materials industry has made great progress and the product structure has been greatly improved, but modified asphalt waterproofing membrane, as a major category of asphalt-based waterproofing materials, still occupies a large share in the waterproofing materials market.

[0003] Modified asphalt waterproofing membranes are made by coating both sides of a pre-impregnated base with polymer-modified asphalt as a topcoat. The upper surface is then sprinkled with mineral granules, flakes, or a protective film, while the lower surface is sprinkled with fine sand or covered with an insulating material such as PE film. The polymer, as the asphalt's modifying material, plays a crucial role in the quality of the finished membrane.

[0004] The proportion of modified materials in modified asphalt is relatively small, generally around 12%. However, from a microscopic structural perspective, since the high molecular polymer is dispersed in the asphalt, forming a network of continuous structures, the asphalt is distributed in between, forming what is commonly known as an "island structure", which makes the modified asphalt exhibit the characteristics of the high molecular polymer itself to a certain extent, changing the original properties of the asphalt, thereby achieving the purpose of improving the various physical properties of the roll.

[0005] Modified asphalt waterproofing membranes are categorized by the modified materials used: elastomer-modified asphalt waterproofing membranes and plastomer-modified asphalt waterproofing membranes. Elastomer membranes are primarily modified with SBS, though some also use recycled rubber. Plastomer membranes are primarily modified with APP and APAO. SBS-modified asphalt waterproofing membranes enjoy the largest production and sales volume.

[0006] SBS is a thermoplastic elastomer, a block copolymer synthesized from styrene and butadiene. It can be found in two molecular forms: linear and star-shaped. The linear SBS has a lower molecular weight of approximately 100,000, making it easily miscible with asphalt. However, the modification effect is less than ideal, with minimal improvement in the heat resistance and elasticity of the membrane. The star-shaped SBS, on the other hand, has a higher molecular weight of approximately 200,000 and contains numerous branched chains. It is more effective in modifying asphalt, particularly in terms of heat resistance, elasticity, and low-temperature flexibility, making it more suitable for the production of modified asphalt waterproofing membranes. However, since star-shaped SBS is difficult to mix with asphalt and the production viscosity is too high, in actual production, grinding equipment such as a colloid mill is generally added to ensure that the SBS and asphalt are fully mixed in the shortest possible time. The reaction is carried out at high temperature, and an appropriate amount of co-solvent (engine oil, waste oil) is added. For example, the asphalt-modified waterproof membrane disclosed in CN 102852235A uses SBS to modify its asphalt layer, and 6% to 10% of engine oil must also be used, resulting in increased energy consumption and severe oil fume pollution.

[0007] In this regard, the present invention relates to an asphalt waterproofing roll and a preparation method thereof. Asphalt is modified by a specific modifier, and the obtained roll has excellent high and low temperature performance and storage stability; it obviously has positive practical significance. Summary of the Invention

[0008] The invention aims to provide an asphalt waterproofing coiled material and a preparation method thereof.

[0009] In order to achieve the above-mentioned purpose of the invention, the technical solution adopted by the present invention is: an asphalt waterproofing membrane, including an asphalt layer formed by applying an asphalt mixture on a base, in which, by weight percentage, the asphalt mixture includes 40% to 70% petroleum asphalt, 25% to 50% filler, and 7% to 12% modifier, and the modifier includes styrene-butadiene rubber and polyethylene wax; the asphalt mixture does not include engine oil.

[0010] Preferably, the petroleum asphalt is 70# asphalt, 90# asphalt or a combination thereof; and the filler is talcum powder, calcium powder or a combination thereof.

[0011] Preferably, the modifier comprises, by weight percentage: 25% to 80% of styrene-butadiene rubber; 15% to 70% of polyethylene wax; 0.5% to 3% of a vulcanizing agent or a combination thereof with a vulcanizing agent accelerator; and 0.1% to 2% of an antioxidant.

[0012] Preferably, the modifier comprises: 45% to 75% of styrene-butadiene rubber, 20% to 55% of polyethylene wax, 0.5% to 3% of a vulcanizing agent or a combination thereof with a vulcanizing agent accelerator, and 0.1% to 2% of an antioxidant.

[0013] Preferably, the weight percentage of the vulcanizing agent in the modifier raw material is 1% to 3%, more preferably 1.5% to 2.5%.

[0014] Preferably, the weight percentage of the antioxidant in the modifier raw material is 0.1% to 1%, more preferably 0.1% to 0.5%.

[0015] Preferably, the styrene butadiene rubber is emulsion polymerized styrene butadiene rubber powder, including various series of domestic emulsion polymerized styrene butadiene rubber powders dedicated to asphalt, such as GS-1A, GS-1B, and QL-6.

[0016] Preferably, the polyethylene wax is a combination of one or more of Honeywell International's Titan 7205, Titan 7686, and Titan 8903, with Titan 8903 being more preferred.

[0017] Preferably, the vulcanizing agent is a combination of one or more selected from sulfur and peroxide.

[0018] Preferably, the vulcanization accelerator is a combination of one or more of thiurams, thiazoles, dithiocarbamates, and zinc oxide.

[0019] Preferably, the antioxidant is a combination of one or more of an alkylphenol and a hindered amine antioxidant.

[0020] The present application also claims a method for preparing an asphalt waterproofing membrane, which is used to prepare the asphalt waterproofing membrane described above, comprising the following steps:

[0021] (1) preparing the modifier: adding all raw materials constituting the modifier into a high-speed mixer according to a proportion and mixing them, and after being uniformly mixed, feeding them into a twin-screw extruder feeder, extruding them through the twin-screw extruder, drawing them into strips, cooling them, and pelletizing them to obtain the asphalt waterproofing membrane modifier;

[0022] (2) Preparation of asphalt mixture: heating the petroleum asphalt to 190-200° C., adding the modifier, keeping the temperature for reaction for 2-3 hours, then adding the filler and stirring for 0.5-1 hour to obtain the asphalt mixture.

[0023] Preferably, in step (1), during the extrusion process of the twin-screw extruder, the temperature of the feeding section is 20-40°C, the temperature of the compression section is 130-160°C, and the temperature of the metering section is 130-150°C; during the extrusion process, the styrene-butadiene rubber and the polyethylene wax undergo a dynamic crosslinking reaction under the action of the vulcanizing agent.

[0024] Preferably, the specific method for uniformly mixing the raw materials is to add all the raw materials into a high-speed mixer according to the proportions and mix them.

[0025] In the above, this application adopts a dynamic cross-linking process to prepare an asphalt waterproofing membrane modifier, which fully integrates the low-temperature performance of styrene-butadiene rubber and the high-temperature performance of polyethylene wax. The styrene-butadiene rubber is dispersed in the polyethylene wax to form a sea-island structure, and the styrene-butadiene rubber is partially cross-linked. Compared with adding styrene-butadiene rubber and polyethylene wax separately, the dynamic cross-linking complex is more easily dissolved and dispersed in the asphalt, forming a cross-linked network structure in the asphalt, greatly improving the high-temperature performance, low-temperature performance and storage stability of the asphalt. Since the specific polyethylene wax can reduce the viscosity of the asphalt, the local cross-linking of the styrene-butadiene rubber to form a cluster structure further reduces the viscosity of the modified asphalt.

[0026] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0027] 1. The present invention uses a specific modifier to modify asphalt, resulting in a roll with excellent high and low temperature performance and storage stability. Furthermore, the modifier has a simple preparation process, requires a small dosage, and is easily dispersed. The production of the asphalt waterproofing roll eliminates the need for engine oil and grinding equipment, significantly reducing oil fume emissions, contributing to energy conservation, environmental protection, and process simplification.

[0028] 2. The process flow of the method of the present invention is low-carbon and environmentally friendly, in line with the national "four savings and one environmental protection" policy, with low equipment investment and operating costs, which is conducive to promotion and application. DETAILED DESCRIPTION

[0029] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0030] Unless otherwise specified, the examples of the present invention in which specific conditions are not specified were carried out under conventional conditions or the conditions recommended by the manufacturer. All raw materials, reagents, etc. used without indicating the manufacturer are conventional products that can be purchased commercially. The materials involved in the following examples can all be obtained from commercial channels.

[0031] Example 1

[0032] This embodiment provides an asphalt waterproofing membrane, the raw material formula of which is as follows: 58% petroleum asphalt, 30% filler, and 12% modifier. The asphalt mixture does not include engine oil.

[0033] Preferably, the petroleum asphalt is 90# asphalt.

[0034] Preferably, the filler is talc.

[0035] The modifier comprises 50% of styrene-butadiene rubber, 30% of polyethylene wax, 2% of a combination of a vulcanizing agent and a vulcanizing agent accelerator, and 1% of an antioxidant.

[0036] The polyethylene wax is Titan8903; the vulcanizing agent is sulfur; the vulcanizing agent accelerator is thiuram-type TMTD; and the antioxidant is hindered amine Irganox 1010.

[0037] The preparation method of asphalt waterproof membrane is as follows:

[0038] (1) preparing the modifier: adding all raw materials constituting the modifier into a high-speed mixer according to a proportion and mixing them, feeding them into a twin-screw extruder feeder after being uniformly mixed, extruding them through the twin-screw extruder, drawing them into strips, cooling them, and pelletizing them to obtain the asphalt waterproofing membrane modifier; during the extrusion process of the twin-screw extruder, the temperature of the feeding section is 35-40° C., the temperature of the compression section is 150-160° C., and the temperature of the metering section is 130-140° C.; during the extrusion process, the styrene-butadiene rubber and the polyethylene wax undergo a dynamic crosslinking reaction under the action of a vulcanizing agent;

[0039] (2) Preparation of asphalt mixture: heating the petroleum asphalt to 190-200° C., adding the modifier, keeping the temperature for reaction for 2-3 hours, then adding the filler and stirring for 0.5-1 hour to obtain the asphalt mixture.

[0040] Example 2

[0041] This embodiment provides an asphalt waterproofing membrane, the raw material formula of which is as follows: 50% petroleum asphalt, 40% filler, and 10% modifier. The asphalt mixture does not include engine oil.

[0042] Preferably, the petroleum asphalt is 70# asphalt.

[0043] Preferably, the filler is heavy calcium powder.

[0044] The modifier and preparation method are the same as in Example 1.

[0045] Example 3

[0046] This embodiment provides an asphalt waterproofing membrane, the raw material formula of which is as follows: 45% petroleum asphalt, 47% filler, and 8% modifier. The asphalt mixture does not include engine oil.

[0047] Preferably, the petroleum asphalt is 70# asphalt.

[0048] Preferably, the filler is talc powder and calcium powder in a ratio of 1:1.

[0049] The modifier and preparation method are the same as in Example 1.

[0050] Comparative Example 1

[0051] This embodiment provides an SBS modified asphalt waterproofing membrane, the raw material formula of which is as follows: 50% petroleum asphalt, 10% SBS modifier, 10% engine oil, and 30% filler. The asphalt mixture is prepared in the same manner as in Example 1.

[0052] The above embodiment was tested, and the test results obtained are shown in the following table:

[0053]

[0054] As can be seen from the above table, the heat resistance and low-temperature flexibility indicators of Examples 1 to 3 are not much different from those of Comparative Example 1, but the seam peel strength, oil permeability, and indicators after heat aging are far superior to those of Comparative Example 1. This shows that while the introduction of engine oil improves the low-temperature performance, the peel strength, storage stability, and aging performance also decrease. This indicates that during the production and application process, the volatilization of light components in the engine oil will lead to high energy consumption, high emissions, high pollution, and low quality of the product.

[0055] In the above, the product testing and characterization methods used in the embodiments and comparative examples of the present invention are shown in the following table:

[0056] performance Test standards Heat resistance (℃) GB / T 328.11-2007 Low temperature (℃) GB / T 328.14-2007 Seam peel strength (N / mm) GB18242-2008 Oil permeability (sheets) JC / T 904-2002 Thermal aging GB18242-2008

[0057] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An asphalt waterproofing membrane, characterized in that: It includes an asphalt layer formed by applying an asphalt mixture on a tire base. Calculated by weight percentage, the asphalt mixture includes 40% to 70% petroleum asphalt, 25% to 50% filler, and 7% to 12% modifier. The modifier includes styrene-butadiene rubber and polyethylene wax. The asphalt mixture does not include engine oil.

2. The asphalt waterproofing membrane according to claim 1, characterized in that: The petroleum asphalt is 70# asphalt, 90# asphalt or a combination thereof; the filler is talcum powder, calcium powder or a combination thereof.

3. The asphalt waterproofing membrane according to claim 1, characterized in that: Calculated by weight percentage, the modifier includes: 25% to 80% of styrene-butadiene rubber, 15% to 70% of polyethylene wax, 0.5% to 3% of a vulcanizing agent or a combination thereof with a vulcanizing agent accelerator, and 0.1% to 2% of an antioxidant.

4. The asphalt waterproofing membrane according to claim 1, characterized in that: The styrene butadiene rubber is emulsion polymerized styrene butadiene rubber powder.

5. The asphalt waterproofing membrane according to claim 1, characterized in that: The vulcanizing agent is a combination of one or more selected from sulfur and peroxide.

6. The asphalt waterproofing membrane according to claim 1, characterized in that: The vulcanization accelerator is a combination of one or more of thiurams, thiazoles, dithiocarbamates, and zinc oxide.

7. The asphalt waterproofing membrane according to claim 1, characterized in that: The antioxidant is a combination of one or more of an alkylphenol and a hindered amine antioxidant.

8. A method for preparing an asphalt waterproofing membrane, characterized in that: The method for preparing the asphalt waterproofing membrane according to any one of claims 1 to 7 comprises the following steps: (1) preparing the modifier: adding all raw materials constituting the modifier into a high-speed mixer according to a proportion and mixing them, and after being uniformly mixed, feeding them into a twin-screw extruder feeder, extruding them through the twin-screw extruder, drawing them into strips, cooling them, and pelletizing them to obtain the asphalt waterproofing membrane modifier; (2) Preparation of asphalt mixture: heating the petroleum asphalt to 190-200° C., adding the modifier, keeping the temperature for reaction for 2-3 hours, then adding the filler and stirring for 0.5-1 hour to obtain the asphalt mixture.

9. The method for preparing an asphalt waterproofing membrane according to claim 8, wherein: In step (1), during the extrusion process of the twin-screw extruder, the temperature of the feeding section is 20-40°C, the temperature of the compression section is 130-160°C, and the temperature of the metering section is 130-150°C; during the extrusion process, the styrene-butadiene rubber and the polyethylene wax undergo a dynamic crosslinking reaction under the action of a vulcanizing agent.

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