Aging-resistant asphalt for waterproofing membrane and preparation method thereof

Abstract

The present application relates to a kind of waterproofing membrane with anti-aging type pitch, raw materials include: matrix 70# pitch 100PHR, pitch crosslinking agent 0.05-2.0PHR, pitch viscosity reducer 3-8PHR.The pitch crosslinking agent is one of sodium borohydride, dicyclohexyl carbodiimide (DCC), tetrabutyl titanate, tetrameric acetaldehyde;The pitch viscosity reducer is one of reduced three-line oil, reduced four-line oil, heat conducting oil, rubber softening oil.Preparation method is: to metal storage tank according to proportion 100PHR 70# matrix pitch is added, slowly heated to 130-150 ℃ after adding 0.05-2.0PHR pitch crosslinking agent, and keep at 1000rpm under stirring 3h, keep temperature at 130-150 ℃ under adding 3-8PHR pitch viscosity reducer, and keep at 1000rpm under stirring 1-1.5h, it is prepared waterproofing membrane with anti-aging type pitch.It has super high durable use characteristic, when it is applied to self-adhesive waterproofing membrane, it can significantly improve the low-temperature flexibility of self-adhesive waterproofing membrane after aging, and has good popularization and application prospect.

Description

Technical Field

[0001] This invention belongs to the field of petroleum asphalt, specifically relating to an aging-resistant asphalt for waterproof membranes and its preparation method. Background Technology

[0002] Waterproof membranes include polymer-modified bitumen waterproof membranes and polymer waterproof membranes, among which SBS-modified bitumen waterproof membranes have gained an important position in the waterproofing field due to their excellent high and low temperature performance. However, under the influence of environmental factors such as heat, oxygen, and ultraviolet radiation, the performance of polymer-modified bitumen will deteriorate to a certain extent, resulting in a significant reduction in the durability of waterproof materials.

[0003] More importantly, over 70% of the waterproofing materials used in the domestic and international building waterproofing industry are based on asphalt, and asphalt accounts for a very significant proportion of the waterproofing material formulation, exceeding 50% by weight. Furthermore, extensive research data shows that the performance of asphalt has a decisive impact on the performance of the resulting waterproofing material. In other words, the better the aging resistance of the asphalt used, the better the aging resistance of the resulting waterproofing material. Generally, 70# or 90# grade asphalt is the two most commonly used base asphalts for making asphalt-based waterproofing membranes, and the production cost of 70# asphalt is lower than that of 90# asphalt. Therefore, improving the aging resistance of asphalt is the optimal solution to enhance the aging resistance of waterproofing materials. This invention selects the more cost-effective 70# asphalt as the main object of modification research. The 70# asphalt used has a softening point of 45-50℃, a penetration of 60-80 (1 / 10mm), and a ductility of ≥100cm at 25℃.

[0004] The existing technology, as disclosed in "An Aging-Resistant Modified Asphalt and Its Preparation Method" (Patent No. 200610124675.2), uses a multilayered inorganic material to form a stable network structure with the layered inorganic material after the polymer modifier swells the asphalt, thereby improving the aging resistance of the asphalt. It is well known that the chemical modifiers (organic amine intercalation aids) and physical modifiers (polymer modifiers and layered silicate clay) used in this method are relatively expensive, with costs exceeding 10,000 yuan / ton, while the cost of asphalt is around 3,000 yuan / ton. The resulting aging-resistant asphalt is prohibitively expensive, making industrialization virtually impossible and hindering its widespread application.

[0005] The existing patent "A Compound Aging-Resistant Modified Asphalt and Its Preparation Method" (patent number 201510003505.8) discloses a preparation method that uses asphalt, compatibilizer, nanomaterials, modifiers, rubber powder, chemical additives, and stabilizers. By using multi-functional antioxidant and oxygen-barrier additives, the resulting asphalt exhibits antioxidant effects, thus possessing aging-resistant properties. However, phytic acid, nanomaterials, polymer modifiers, and chemical additives are all relatively expensive modifiers; for example, phytic acid costs around 100,000 yuan per ton. Therefore, the widespread application of the aging-resistant asphalt prepared by this method is still constrained by cost factors.

[0006] In summary, while existing technologies can produce asphalt with aging-resistant properties, the high cost of additives makes industrial-scale production of such asphalt virtually impossible. Furthermore, asphalt produced using currently available technologies is primarily used in the road industry and is not suitable for waterproofing applications.

[0007] The preparation method disclosed in the patent "An Adhesive for an Asphalt-Based Waterproofing System" (patent number 202010360515.8) in other existing technologies uses asphalt, modifier, mineral powder, crosslinking agent, heat stabilizer, viscosity modifier and other raw materials to obtain an asphalt-based waterproofing adhesive with good heat resistance, strong adhesion and aging resistance. This technology overcomes the current situation of the two existing technologies mentioned above, which have expensive additives, limited industrialization prospects and are not suitable for waterproofing applications. It improves the formulation of asphalt-based waterproofing adhesive by adding crosslinking agent and functional additives, thereby improving aging resistance and adhesion performance. At the same time, it improves the performance after repeated melting. This process must simultaneously combine sulfur crosslinking agent and tribasic lead sulfate heat stabilizer. The ratio of the two is strictly required. Too much sulfur will cause asphalt gelation risk, and too much lead salt will reduce the fluidity of the system. At the same time, since sulfur is used as a crosslinking agent, the temperature will produce toxic fumes when it is too high, which will seriously pollute the environment and have a great impact on the health of operators.

[0008] Based on the existing technologies mentioned above, which suffer from high costs, limited industrialization prospects, high requirements for additives, harsh application conditions, and potential environmental pollution during implementation, this invention patent proposes a method for preparing aging-resistant asphalt for waterproof membranes. This method involves aging-resistant asphalt that, after being modified and adjusted using a special low-cost modifier, possesses extremely high durability. When applied to self-adhesive waterproof membranes, it significantly improves the low-temperature flexibility of the membranes after aging, thereby enhancing their aging resistance. Summary of the Invention

[0009] The purpose of this invention is to improve the aging resistance of waterproof materials and to provide an aging-resistant asphalt for waterproof membranes and its preparation method. The aging-resistant asphalt, after being modified and adjusted using a special low-cost modifier, possesses extremely high durability. When applied to self-adhesive waterproof membranes, it significantly improves the low-temperature flexibility of the membranes after aging.

[0010] To achieve the above objectives, the present invention adopts the following technical solution: an aging-resistant asphalt for waterproof membranes, wherein the aging-resistant asphalt comprises the following raw materials: 100 PHR of matrix 70# asphalt, 0.05-2.0 PHR of asphalt crosslinking agent, and 3-8 PHR of asphalt viscosity reducer.

[0011] The aforementioned waterproof membrane uses an aging-resistant asphalt, wherein the asphalt crosslinking agent is one of sodium borohydride, dicyclohexylcarbodiimide (DCC), tetrabutyl titanate, and tetraacetaldehyde.

[0012] The aforementioned waterproof membrane uses an aging-resistant asphalt, wherein the asphalt viscosity reducer is one of three types: three-line reducing oil, four-line reducing oil, heat-conducting oil, or rubber softening oil.

[0013] Preferably, the reduced-pressure distillation oil is a product from a crude oil vacuum distillation tower with a flash point of 200-250℃ and an ash content of ≤0.1%; the reduced-pressure distillation oil is a product from a crude oil vacuum distillation tower with a flash point of 250-300℃ and an ash content of ≤0.1%.

[0014] Preferably, the heat transfer oil has a flash point ≥250℃, a specific gravity of 0.85, a pour point of -15℃, and a kinematic viscosity of 320 at 40℃.

[0015] Preferably, the rubber softening oil has a flash point ≥210℃, a specific gravity of 1.03, a pour point of -10℃, and an aromatic hydrocarbon content ≥80%.

[0016] The method for preparing an aging-resistant asphalt for waterproof membranes includes the following steps: adding 100 PHR of 70# base asphalt to a reaction vessel in a certain proportion, slowly heating to a certain temperature and adding 0.05-2.0 PHR of asphalt crosslinking agent, and stirring under certain conditions; adding 3-8 PHR of asphalt viscosity reducer while maintaining a certain temperature, and stirring under certain conditions to obtain the aging-resistant asphalt for waterproof membranes.

[0017] Preferably, the reaction vessel is a metal storage tank, for example, a 5L metal storage tank.

[0018] Preferably, the temperature needs to be slowly raised to 130-150°C before adding the asphalt crosslinking agent.

[0019] Preferably, after adding the asphalt crosslinking agent, the mixture is stirred at 1000 rpm for 3 hours, and the asphalt viscosity reducer is added while maintaining the temperature at 130-150℃.

[0020] Preferably, after adding the asphalt viscosity reducer, and stirring at 1000 rpm for 1-1.5 hours, the aging-resistant asphalt for waterproof membrane is obtained.

[0021] For example, the preparation method of the aging-resistant asphalt for waterproof membrane includes the following steps: 100 PHR of 70# base asphalt is added to a 5L metal storage tank in a certain proportion, the temperature is slowly raised to 130-150℃, 0.05-2.0 PHR of asphalt crosslinking agent is added, and the mixture is stirred at 1000 rpm for 3 hours. The temperature is maintained at 130-150℃, 3-8 PHR of asphalt viscosity reducer is added, and the mixture is stirred at 1000 rpm for 1-1.5 hours to obtain the aging-resistant asphalt for waterproof membrane.

[0022] The present invention also relates to a self-adhesive waterproof membrane, which is obtained by using the above-mentioned waterproof membrane aging-resistant asphalt or the waterproof membrane aging-resistant asphalt prepared by the above-mentioned preparation method.

[0023] The self-adhesive waterproof membrane is prepared by the following method: Weigh 100PHR of modified asphalt and 150PHR of 200# asphalt, heat to 200℃ while stirring, add 25PHR of SBS, 30PHR of SBR and 75PHR of waste adhesive powder, maintain the swelling for 200 minutes, add 120PHR of heavy calcium carbonate filler, keep stirring for 80 minutes, and then form to obtain the self-adhesive waterproof membrane.

[0024] The beneficial effects of this invention are:

[0025] (1) The aging-resistant asphalt involved in this invention, after being modified and adjusted using a special low-cost modifier, possesses extremely high durability. When applied to self-adhesive waterproof membranes, it significantly improves the low-temperature flexibility of the membranes after aging. For example, self-adhesive waterproof membranes made with aging-resistant asphalt, after undergoing 7 days of thermo-oxidative aging at 80℃, show a decrease in low-temperature flexibility from -27℃ to -23℃, a decrease of only 4℃. In contrast, unmodified conventional asphalt, after 7 days of thermo-oxidative aging at 80℃, shows a sharp decrease in low-temperature flexibility from -29℃ to -18℃, a decrease of 11℃. This is because the modified asphalt itself forms a network structure. During the swelling process with modifiers such as SBS, the network structures between them further penetrate, allowing the coating material to maintain structural stability during aging and preventing phase separation. Ultimately, the membrane can still maintain relatively good performance after aging. Unmodified asphalt, on the one hand, has poor compatibility with polymer modifiers, and after thermo-oxidative aging, it is very easy to separate from the coating material, causing the performance of the roll material to deteriorate rapidly.

[0026] In terms of cost, this invention does not use expensive polymer modifiers. Instead, it uses low-cost chemical crosslinking agents, which only require a small amount to achieve effective chemical modification. When used in combination with asphalt viscosity reducers, it can meet the asphalt usage standards for waterproof membranes.

[0027] In summary, the aging-resistant asphalt of this patented invention, when applied to the production of self-adhesive waterproof membranes, significantly improves the aging resistance of the membranes and has a clear competitive advantage in terms of cost, thus showing good prospects for widespread application. Detailed Implementation

[0028] To facilitate understanding of the present invention, various exemplary embodiments of the present invention are now described in detail. This detailed description should not be regarded as a specific limitation of the present invention, but should be understood as a more detailed description of certain aspects, features and embodiments of the present invention.

[0029] It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the invention. Furthermore, with respect to numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is specifically disclosed. Any stated value or intermediate value within a stated range, as well as each smaller range between any other stated value or intermediate value within said range, is also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0030] The terms “include,” “including,” “have,” “contain,” etc., used in this article are all open-ended terms, meaning that they include but are not limited to.

[0031] Example 1

[0032] This embodiment discloses an aging-resistant modified asphalt and its preparation method. The aging-resistant modified asphalt is composed of raw materials with the following percentage rubber addition (PHR):

[0033] 70# asphalt, 100 PHR;

[0034] Sodium borohydride 1.0 PHR;

[0035] Reduced fuel consumption by 6.0 PHR;

[0036] The above-mentioned aging-resistant modified asphalt is prepared by the following method, including the following steps:

[0037] A1 According to the formula, 70# asphalt (provided by a local refinery) is heated to 130-150℃ and then asphalt crosslinking agent is added. Stirring is maintained at 1000rpm for 3 hours. Asphalt viscosity reducer of the formula amount is added while maintaining the temperature at 130-150℃. After heat preservation for 1.5 hours, aging resistant asphalt is obtained.

[0038] A2 uses asphalt obtained from A1, combined with polymer modifiers, rubber powder, and filler powder, and mixed at high temperature to prepare a self-adhesive membrane coating, which is then used to make a self-adhesive waterproof membrane. Details are as follows:

[0039] Weigh 100 PHR of A1 modified asphalt and 150 PHR of 200# asphalt, heat to 200℃ while stirring, add 25 PHR of SBS, 30 PHR of SBR and 75 PHR of waste rubber powder, maintain development and swelling for 200 min, then add 120 PHR of heavy calcium carbonate filler, keep stirring for 80 min, and then form to obtain self-adhesive waterproof membrane.

[0040] Example 2

[0041] This embodiment discloses an aging-resistant modified asphalt and its preparation method. The aging-resistant modified asphalt is composed of raw materials with the following percentage rubber addition (PHR):

[0042] 70# asphalt, 100 PHR;

[0043] Sodium borohydride 0.5 PHR;

[0044] 5.0 PHR heat transfer oil;

[0045] The above-mentioned aging-resistant modified asphalt is prepared by the following method, including the following steps:

[0046] A1 According to the formula, 70# asphalt (provided by a local refinery 2) is heated to 130-150℃ and then asphalt crosslinking agent is added. Stirring is maintained at 1000rpm for 3 hours. Asphalt viscosity reducer of the formula is added while maintaining the temperature at 130-150℃. After keeping the temperature for 1.5 hours, aging-resistant asphalt is obtained.

[0047] A2 uses asphalt obtained from A1, combined with polymer modifiers, rubber powder, and filler powder, and mixed at high temperature to prepare a self-adhesive membrane coating, which is then used to make a self-adhesive waterproof membrane. Details are as follows:

[0048] Weigh 100 PHR of A1 modified asphalt and 150 PHR of 200# asphalt, heat to 200℃ while stirring, add 25 PHR of SBS, 30 PHR of SBR and 75 PHR of waste rubber powder, maintain development and swelling for 200 min, then add 120 PHR of heavy calcium carbonate filler, keep stirring for 80 min, and then form to obtain self-adhesive waterproof membrane.

[0049] Example 3

[0050] This embodiment discloses an aging-resistant modified asphalt and its preparation method. The aging-resistant modified asphalt is composed of raw materials with the following percentage rubber addition (PHR):

[0051] 70# asphalt, 100 PHR;

[0052] Sodium borohydride 1.2 PHR;

[0053] Rubber oil 8.0 PHR;

[0054] The above-mentioned aging-resistant modified asphalt is prepared by the following method, including the following steps:

[0055] A1 According to the formula, 70# asphalt (provided by a local refinery) is heated to 130-150℃ and then asphalt crosslinking agent is added. Stirring is maintained at 1000rpm for 3 hours. Asphalt viscosity reducer of the formula is added while maintaining the temperature at 130-150℃. After keeping the temperature for 1.0 hour, aging-resistant asphalt is obtained.

[0056] A2 uses asphalt obtained from A1, combined with polymer modifiers, rubber powder, and filler powder, and mixed at high temperature to prepare a self-adhesive membrane coating, which is then used to make a self-adhesive waterproof membrane. Details are as follows:

[0057] Weigh 100 PHR of A1 modified asphalt and 150 PHR of 200# asphalt, heat to 200℃ while stirring, add 25 PHR of SBS, 30 PHR of SBR and 75 PHR of waste rubber powder, maintain development and swelling for 200 min, then add 120 PHR of heavy calcium carbonate filler, keep stirring for 80 min, and then form to obtain self-adhesive waterproof membrane.

[0058] Example 4

[0059] This embodiment discloses an aging-resistant modified asphalt and its preparation method. The aging-resistant modified asphalt is composed of raw materials with the following percentage rubber addition (PHR):

[0060] 70# asphalt, 100 PHR;

[0061] Dicyclohexylcarbodiimide 1.0 PHR;

[0062] Reduce four-line oil 5.0PHR;

[0063] The above-mentioned aging-resistant modified asphalt is prepared by the following method, including the following steps:

[0064] A1 According to the formula, 70# asphalt (provided by a local refinery No. 4) is heated to 130-150℃ and then asphalt crosslinking agent is added. Stirring is maintained at 1000rpm for 3 hours. Asphalt viscosity reducer of the formula is added while maintaining the temperature at 130-150℃. After keeping the temperature for 1.0 hour, aging-resistant asphalt is obtained.

[0065] A2 uses asphalt obtained from A1, combined with polymer modifiers, rubber powder, and filler powder, and mixed at high temperature to prepare a self-adhesive membrane coating, which is then used to make a self-adhesive waterproof membrane. Details are as follows:

[0066] Weigh 100 PHR of A1 modified asphalt and 150 PHR of 200# asphalt, heat to 200℃ while stirring, add 25 PHR of SBS, 30 PHR of SBR and 75 PHR of waste rubber powder, maintain development and swelling for 200 min, then add 120 PHR of heavy calcium carbonate filler, keep stirring for 80 min, and then form to obtain self-adhesive waterproof membrane.

[0067] Example 5

[0068] This embodiment discloses an aging-resistant modified asphalt and its preparation method. The aging-resistant modified asphalt is composed of raw materials with the following percentage rubber addition (PHR):

[0069] 70# asphalt, 100 PHR;

[0070] Dicyclohexylcarbodiimide 0.5 PHR;

[0071] Rubber oil 3.0PHR;

[0072] The above-mentioned aging-resistant modified asphalt is prepared by the following method, including the following steps:

[0073] A1 According to the formula, 70# asphalt (provided by a local refinery) is heated to 130-150℃ and then asphalt crosslinking agent is added. Stirring is maintained at 1000rpm for 3 hours. Asphalt viscosity reducer is added at the formula amount while maintaining the temperature at 130-150℃. After keeping the temperature for 1.0 hour, aging-resistant asphalt is obtained.

[0074] A2 uses asphalt obtained from A1, combined with polymer modifiers, rubber powder, and filler powder, and mixed at high temperature to prepare a self-adhesive membrane coating, which is then used to make a self-adhesive waterproof membrane. Details are as follows:

[0075] Weigh 100 PHR of A1 modified asphalt and 150 PHR of 200# asphalt, heat to 200℃ while stirring, add 25 PHR of SBS, 30 PHR of SBR and 75 PHR of waste rubber powder, maintain development and swelling for 200 min, then add 120 PHR of heavy calcium carbonate filler, keep stirring for 80 min, and then form to obtain self-adhesive waterproof membrane.

[0076] Example 6

[0077] This embodiment discloses an aging-resistant modified asphalt and its preparation method. The aging-resistant modified asphalt is composed of raw materials with the following percentage rubber addition (PHR):

[0078] 70# asphalt, 100 PHR;

[0079] Tetrabutyl titanate 1.5PHR;

[0080] Reduced fuel consumption by 7.0 PHR (3-line fuel);

[0081] The above-mentioned aging-resistant modified asphalt is prepared by the following method, including the following steps:

[0082] A1 According to the formula, 70# asphalt (provided by a local refinery 2) is heated to 130-150℃ and then asphalt crosslinking agent is added. Stirring is maintained at 1000rpm for 3 hours. Asphalt viscosity reducer of the formula is added while maintaining the temperature at 130-150℃. After keeping the temperature for 1.0 hour, aging-resistant asphalt is obtained.

[0083] A2 uses asphalt obtained from A1, combined with polymer modifiers, rubber powder, and filler powder, and mixed at high temperature to prepare a self-adhesive membrane coating, which is then used to make a self-adhesive waterproof membrane. Details are as follows:

[0084] Weigh 100 PHR of A1 modified asphalt and 150 PHR of 200# asphalt, heat to 200℃ while stirring, add 25 PHR of SBS, 30 PHR of SBR and 75 PHR of waste rubber powder, maintain development and swelling for 200 min, then add 120 PHR of heavy calcium carbonate filler, keep stirring for 80 min, and then form to obtain self-adhesive waterproof membrane.

[0085] Example 7

[0086] This embodiment discloses an aging-resistant modified asphalt and its preparation method. The aging-resistant modified asphalt is composed of raw materials with the following percentage rubber addition (PHR):

[0087] 70# asphalt, 100 PHR;

[0088] Tetrabutyl titanate 0.05 PHR;

[0089] 5.0 PHR heat transfer oil;

[0090] The above-mentioned aging-resistant modified asphalt is prepared by the following method, including the following steps:

[0091] A1 According to the formula, 70# asphalt (provided by a local refinery No. 4) is heated to 130-150℃ and then asphalt crosslinking agent is added. Stirring is maintained at 1000rpm for 3 hours. Asphalt viscosity reducer of the formula is added while maintaining the temperature at 130-150℃. After keeping the temperature for 1.0 hour, aging-resistant asphalt is obtained.

[0092] A2 uses asphalt obtained from A1, combined with polymer modifiers, rubber powder, and filler powder, and mixed at high temperature to prepare a self-adhesive membrane coating, which is then used to make a self-adhesive waterproof membrane. Details are as follows:

[0093] Weigh 100 PHR of A1 modified asphalt and 150 PHR of 200# asphalt, heat to 200℃ while stirring, add 25 PHR of SBS, 30 PHR of SBR and 75 PHR of waste rubber powder, maintain development and swelling for 200 min, then add 120 PHR of heavy calcium carbonate filler, keep stirring for 80 min, and then form to obtain self-adhesive waterproof membrane.

[0094] Example 8

[0095] This embodiment discloses an aging-resistant modified asphalt and its preparation method. The aging-resistant modified asphalt is composed of raw materials with the following percentage rubber addition (PHR):

[0096] 70# asphalt, 100 PHR;

[0097] Tetrabutyl titanate 0.1 PHR;

[0098] Rubber oil 3.0PHR;

[0099] The above-mentioned aging-resistant modified asphalt is prepared by the following method, including the following steps:

[0100] A1 According to the formula, 70# asphalt (provided by a local refinery) is heated to 130-150℃ and then asphalt crosslinking agent is added. Stirring is maintained at 1000rpm for 3 hours. Asphalt viscosity reducer of the formula is added while maintaining the temperature at 130-150℃. After keeping the temperature for 1.0 hour, aging-resistant asphalt is obtained.

[0101] A2 uses asphalt obtained from A1, combined with polymer modifiers, rubber powder, and filler powder, and mixed at high temperature to prepare a self-adhesive membrane coating, which is then used to make a self-adhesive waterproof membrane. Details are as follows:

[0102] Weigh 100 PHR of A1 modified asphalt and 150 PHR of 200# asphalt, heat to 200℃ while stirring, add 25 PHR of SBS, 30 PHR of SBR and 75 PHR of waste rubber powder, maintain development and swelling for 200 min, then add 120 PHR of heavy calcium carbonate filler, keep stirring for 80 min, and then form to obtain self-adhesive waterproof membrane.

[0103] Example 9

[0104] This embodiment discloses an aging-resistant modified asphalt and its preparation method. The aging-resistant modified asphalt is composed of raw materials with the following percentage rubber addition (PHR):

[0105] 70# asphalt, 100 PHR;

[0106] Methanaldehyde 1.5 PHR;

[0107] Reduce four-line oil 5.0PHR;

[0108] The above-mentioned aging-resistant modified asphalt is prepared by the following method, including the following steps:

[0109] A1 According to the formula, 70# asphalt (provided by a local refinery) is heated to 130-150℃ and then asphalt crosslinking agent is added. Stirring is maintained at 1000rpm for 3 hours. Asphalt viscosity reducer is added at the formula amount while maintaining the temperature at 130-150℃. After keeping the temperature for 1.0 hour, aging-resistant asphalt is obtained.

[0110] A2 uses asphalt obtained from A1, combined with polymer modifiers, rubber powder, and filler powder, and mixed at high temperature to prepare a self-adhesive membrane coating, which is then used to make a self-adhesive waterproof membrane. Details are as follows:

[0111] Weigh 100 PHR of A1 modified asphalt and 150 PHR of 200# asphalt, heat to 200℃ while stirring, add 25 PHR of SBS, 30 PHR of SBR and 75 PHR of waste rubber powder, maintain development and swelling for 200 min, then add 120 PHR of heavy calcium carbonate filler, keep stirring for 80 min, and then form to obtain self-adhesive waterproof membrane.

[0112] Example 10

[0113] This embodiment discloses an aging-resistant modified asphalt and its preparation method. The aging-resistant modified asphalt is composed of raw materials with the following percentage rubber addition (PHR):

[0114] 70# asphalt, 100 PHR;

[0115] Methanaldehyde 2.0 PHR;

[0116] Heat transfer oil 6.0 PHR;

[0117] The above-mentioned aging-resistant modified asphalt is prepared by the following method, including the following steps:

[0118] A1 According to the formula, 70# asphalt (provided by a local refinery No. 4) is heated to 130-150℃ and then asphalt crosslinking agent is added. Stirring is maintained at 1000rpm for 3 hours. Asphalt viscosity reducer of the formula is added while maintaining the temperature at 130-150℃. After keeping the temperature for 1.0 hour, aging-resistant asphalt is obtained.

[0119] A2 uses asphalt obtained from A1, combined with polymer modifiers, rubber powder, and filler powder, and mixed at high temperature to prepare a self-adhesive membrane coating, which is then used to make a self-adhesive waterproof membrane. Details are as follows:

[0120] Weigh 100 PHR of A1 modified asphalt and 150 PHR of 200# asphalt, heat to 200℃ while stirring, add 25 PHR of SBS, 30 PHR of SBR and 75 PHR of waste rubber powder, maintain development and swelling for 200 min, then add 120 PHR of heavy calcium carbonate filler, keep stirring for 80 min, and then form to obtain self-adhesive waterproof membrane.

[0121] Comparative Example 1

[0122] The difference between this comparative example and Example 1 is that the asphalt used is conventionally purchased asphalt, applied directly to the preparation of self-adhesive waterproof membrane without any modification. The asphalt waterproof membrane coating is composed of the following raw materials with the following percentage of rubber added (PHR):

[0123] This embodiment discloses an aging-resistant modified asphalt and its preparation method. The aging-resistant modified asphalt is composed of raw materials with the following percentage rubber addition (PHR):

[0124] 70# asphalt, 100 PHR;

[0125] The 70# used was a sample provided by a local refinery.

[0126] The above-mentioned asphalt is prepared by the following method, including the following steps:

[0127] A1 According to the mixing ratio, heat 70# asphalt to 130-150℃ and then stir at 1000rpm for 4 hours;

[0128] A2 uses asphalt obtained from A1, combined with polymer modifiers, rubber powder, and filler powder, and mixed at high temperature to prepare a self-adhesive membrane coating, which is then used to make a self-adhesive waterproof membrane. Details are as follows:

[0129] Weigh 100 PHR of A1 modified asphalt and 150 PHR of 200# asphalt, heat to 200℃ while stirring, add 25 PHR of SBS, 30 PHR of SBR and 75 PHR of waste rubber powder, maintain development and swelling for 200 min, then add 120 PHR of heavy calcium carbonate filler, keep stirring for 80 min, and then form to obtain self-adhesive waterproof membrane.

[0130] Comparative Example 2

[0131] The difference between this comparative example and Example 1 is that the asphalt used is conventionally purchased asphalt, applied directly to the preparation of self-adhesive waterproof membrane without any modification. The asphalt waterproof membrane coating is composed of the following raw materials with the following percentage of rubber added (PHR):

[0132] This embodiment discloses an aging-resistant modified asphalt and its preparation method. The aging-resistant modified asphalt is composed of raw materials with the following percentage rubber addition (PHR):

[0133] 70# asphalt, 100 PHR;

[0134] The 70# used was a sample provided by a local refinery.

[0135] The above-mentioned asphalt is prepared by the following method, including the following steps:

[0136] A1 According to the mixing ratio, heat 70# asphalt to 130-150℃ and then stir at 1000rpm for 4 hours;

[0137] A2 uses asphalt obtained from A1, combined with polymer modifiers, rubber powder, and filler powder, and mixed at high temperature to prepare a self-adhesive membrane coating, which is then used to make a self-adhesive waterproof membrane. Details are as follows:

[0138] Weigh 100 PHR of A1 modified asphalt and 150 PHR of 200# asphalt, heat to 200℃ while stirring, add 25 PHR of SBS, 30 PHR of SBR and 75 PHR of waste rubber powder, maintain development and swelling for 200 min, then add 120 PHR of heavy calcium carbonate filler, keep stirring for 80 min, and then form to obtain self-adhesive waterproof membrane.

[0139] Comparative Example 3

[0140] The difference between this comparative example and Example 1 is that the asphalt used is conventionally purchased asphalt, applied directly to the preparation of self-adhesive waterproof membrane without any modification. The asphalt waterproof membrane coating is composed of the following raw materials with the following percentage of rubber added (PHR):

[0141] This embodiment discloses an aging-resistant modified asphalt and its preparation method. The aging-resistant modified asphalt is composed of raw materials with the following percentage rubber addition (PHR):

[0142] 70# asphalt, 100 PHR;

[0143] The 70# used was a sample provided by a local refinery company.

[0144] The above-mentioned asphalt is prepared by the following method, including the following steps:

[0145] A1 According to the mixing ratio, heat 70# asphalt to 130-150℃ and then stir at 1000rpm for 4 hours;

[0146] A2 uses asphalt obtained from A1, combined with polymer modifiers, rubber powder, and filler powder, and mixed at high temperature to prepare a self-adhesive membrane coating, which is then used to make a self-adhesive waterproof membrane. Details are as follows:

[0147] Weigh 100 PHR of A1 modified asphalt and 150 PHR of 200# asphalt, heat to 200℃ while stirring, add 25 PHR of SBS, 30 PHR of SBR and 75 PHR of waste rubber powder, maintain development and swelling for 200 min, then add 120 PHR of heavy calcium carbonate filler, keep stirring for 80 min, and then form to obtain self-adhesive waterproof membrane.

[0148] Comparative Example 4

[0149] The difference between this comparative example and Example 1 is that the asphalt used is conventionally purchased asphalt, applied directly to the preparation of self-adhesive waterproof membrane without any modification. The asphalt waterproof membrane coating is composed of the following raw materials with the following percentage of rubber added (PHR):

[0150] This embodiment discloses an aging-resistant modified asphalt and its preparation method. The aging-resistant modified asphalt is composed of raw materials with the following percentage rubber addition (PHR):

[0151] 70# asphalt, 100 PHR;

[0152] The 70# used was a sample provided by a local refinery company.

[0153] The above-mentioned asphalt is prepared by the following method, including the following steps:

[0154] A1 According to the mixing ratio, heat 70# asphalt to 130-150℃ and then stir at 1000rpm for 4 hours;

[0155] A2 uses asphalt obtained from A1, combined with polymer modifiers, rubber powder, and filler powder, and mixed at high temperature to prepare a self-adhesive membrane coating, which is then used to make a self-adhesive waterproof membrane. Details are as follows:

[0156] Weigh 100 PHR of A1 modified asphalt and 150 PHR of 200# asphalt, heat to 200℃ while stirring, add 25 PHR of SBS, 30 PHR of SBR and 75 PHR of waste rubber powder, maintain development and swelling for 200 min, then add 120 PHR of heavy calcium carbonate filler, keep stirring for 80 min, and then form to obtain self-adhesive waterproof membrane.

[0157] Comparative Example 5

[0158] The modified asphalt described in this comparative example is composed of raw materials with the following percentage rubber addition (PHR):

[0159] 70# asphalt, 100 PHR;

[0160] TMTD 1.0PHR;

[0161] Sasol wax 5.0 PHR;

[0162] The above-mentioned aging-resistant modified asphalt is prepared by the following method, including the following steps:

[0163] A1 According to the formula, 70# asphalt (provided by a local refinery) is heated to 130-150℃ and then asphalt crosslinking agent is added. Stirring is maintained at 1000rpm for 3 hours. Asphalt viscosity reducer of the formula amount is added while maintaining the temperature at 130-150℃. After heat preservation for 1.5 hours, aging resistant asphalt is obtained.

[0164] A2 uses asphalt obtained from A1, combined with polymer modifiers, rubber powder, and filler powder, and mixed at high temperature to prepare a self-adhesive membrane coating, which is then used to make a self-adhesive waterproof membrane. Details are as follows:

[0165] Weigh 100 PHR of A1 modified asphalt and 150 PHR of 200# asphalt, heat to 200℃ while stirring, add 25 PHR of SBS, 30 PHR of SBR and 75 PHR of waste rubber powder, maintain development and swelling for 200 min, then add 120 PHR of heavy calcium carbonate filler, keep stirring for 80 min, and then form to obtain self-adhesive waterproof membrane.

[0166] Comparative Example 6

[0167] The modified asphalt described in this comparative example is composed of raw materials with the following percentage rubber addition (PHR):

[0168] 70# asphalt, 100 PHR;

[0169] DCP 0.5PHR;

[0170] Polyethylene wax 5.0 PHR;

[0171] The above-mentioned aging-resistant modified asphalt is prepared by the following method, including the following steps:

[0172] A1 According to the formula, 70# asphalt (provided by a local refinery) is heated to 130-150℃ and then asphalt crosslinking agent is added. Stirring is maintained at 1000rpm for 3 hours. Asphalt viscosity reducer of the formula amount is added while maintaining the temperature at 130-150℃. After heat preservation for 1.5 hours, aging resistant asphalt is obtained.

[0173] A2 uses asphalt obtained from A1, combined with polymer modifiers, rubber powder, and filler powder, and mixed at high temperature to prepare a self-adhesive membrane coating, which is then used to make a self-adhesive waterproof membrane. Details are as follows:

[0174] Weigh 100 PHR of A1 modified asphalt and 150 PHR of 200# asphalt, heat to 200℃ while stirring, add 25 PHR of SBS, 30 PHR of SBR and 75 PHR of waste rubber powder, maintain development and swelling for 200 min, then add 120 PHR of heavy calcium carbonate filler, keep stirring for 80 min, and then form to obtain self-adhesive waterproof membrane.

[0175] Comparative Example 7

[0176] The modified asphalt described in this comparative example is composed of raw materials with the following percentage rubber addition (PHR):

[0177] 70# asphalt, 100 PHR;

[0178] DCP 1.0PHR;

[0179] Sasol wax 5.0 PHR;

[0180] The above-mentioned aging-resistant modified asphalt is prepared by the following method, including the following steps:

[0181] A1 According to the formula, 70# asphalt (provided by a local refinery) is heated to 130-150℃ and then asphalt crosslinking agent is added. Stirring is maintained at 1000rpm for 3 hours. Asphalt viscosity reducer of the formula amount is added while maintaining the temperature at 130-150℃. After heat preservation for 1.5 hours, aging resistant asphalt is obtained.

[0182] A2 uses asphalt obtained from A1, combined with polymer modifiers, rubber powder, and filler powder, and mixed at high temperature to prepare a self-adhesive membrane coating, which is then used to make a self-adhesive waterproof membrane. Details are as follows:

[0183] Weigh 100 PHR of A1 modified asphalt and 150 PHR of 200# asphalt, heat to 200℃ while stirring, add 25 PHR of SBS, 30 PHR of SBR and 75 PHR of waste rubber powder, maintain development and swelling for 200 min, then add 120 PHR of heavy calcium carbonate filler, keep stirring for 80 min, and then form to obtain self-adhesive waterproof membrane.

[0184] The modified bitumen waterproof membranes prepared in Examples 1 to 10 and Comparative Examples 1 to 7 were sampled and tested for low-temperature flexibility limit according to Part 14 of GB / T328-2007 "Test Methods for Building Waterproof Membranes". Samples were also prepared and tested for heat resistance and low-temperature flexibility according to GB 23442-2009 "Self-adhesive Polymer Modified Bitumen Waterproof Membranes". The maximum value of the aluminum peel strength was used. The aging test involved heating the waterproof membrane in a forced-air oven at 70℃ for 7 days, followed by testing its low-temperature flexibility. The test results are shown in Table 1.

[0185] Table 1. Test data of embodiments and comparative examples of the present invention.

[0186]

[0187] Comparison of the comparative examples and the implementation examples shows that when using base asphalt purchased directly from the market, the softening point of the asphalt is low and the penetration is high. After the self-adhesive roll material is subjected to heat and oxygen aging, the performance of the self-adhesive roll material deteriorates significantly. At the same time, the aluminum plate peeling part is unqualified.

[0188] However, when modifying the asphalt supplied by the four local refineries (Examples 1-10), the asphalt crosslinking agent was used to promote the dehydration and condensation of aldehydes and alcohols in the asphalt components to produce larger molecular units, changing the original sol-gel structure of the asphalt, increasing the softening of the asphalt and decreasing its penetration. Simultaneously, an asphalt viscosity reducer was used to increase the content of soft components in the asphalt, maintaining a high ductility. In this way, during the swelling modification with the auxiliary polymer modifier, the light components in the asphalt colloidal structure were absorbed by the polymer polymer, and the generated large molecular structural units penetrated between the polymer polymer chains and the rubber powder, forming a larger and more stable network structure, thereby improving the aging resistance of the asphalt self-adhesive waterproof membrane. In contrast, the asphalt used in Comparative Examples 1-4 was unmodified asphalt, which could not form a stable network structure when preparing the self-adhesive membrane. Therefore, the performance of the self-adhesive membrane before aging was not significantly different from that prepared with modified asphalt. However, after thermo-oxidative aging, this difference was amplified, and the performance of the self-adhesive waterproof membrane showed a significant decline. Comparative Examples 5-7 used conventional sulfur-containing crosslinking agents and asphalt warm-mix agents. The results showed that the low-temperature flexibility of the waterproof membranes prepared in Comparative Examples 5-7 was relatively poor. This indicates that although the viscosity of the asphalt remains relatively good after crosslinking when using conventional asphalt warm-mix agents, the warm-mix agents have a significant negative impact on the low-temperature flexibility of the asphalt waterproof membrane. Obviously, Comparative Examples 5-7 could not achieve the intended results. In addition, the peel strength after aging was also relatively poor, which obviously could not meet the requirements for use.

[0189] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the technical solution of the present invention, and are not intended to limit the specific implementation of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the claims of the present invention should be included within the protection scope of the claims of the present invention.

Claims

1. An aging-resistant asphalt for waterproof membranes, characterized in that, The aging-resistant asphalt comprises the following raw materials: 100 PHR of base 70# asphalt, 0.05-2.0 PHR of asphalt crosslinking agent, and 3-8 PHR of asphalt viscosity reducer; wherein the asphalt crosslinking agent is one of sodium borohydride, dicyclohexylcarbodiimide, tetrabutyl titanate, and tetraacetal; and the asphalt viscosity reducer is one of three-layer reducing oil, four-layer reducing oil, heat transfer oil, and rubber softening oil.

2. The preparation method of the aging-resistant bitumen for waterproof membrane as described in claim 1, comprising the following preparation steps: adding 100 PHR of 70# base bitumen to a reaction vessel in a certain proportion, slowly heating to a certain temperature and adding 0.05-2.0 PHR of bitumen crosslinking agent, and stirring under certain conditions, and adding 3-8 PHR of bitumen viscosity reducer at a certain temperature, and stirring under certain conditions, thereby obtaining the aging-resistant bitumen for waterproof membrane.

3. The method for preparing aging-resistant bitumen for waterproof membranes as described in claim 2, wherein the reaction vessel is a metal storage tank.

4. In the preparation method of the aging-resistant bitumen for waterproof membrane as described in claim 2, the temperature needs to be slowly raised to 130-150℃ before adding the bitumen crosslinking agent.

5. A method for preparing aging-resistant asphalt for waterproof membranes as described in any one of claims 2-4, wherein after adding the asphalt crosslinking agent, stirring is carried out at 1000 rpm for 3 hours, and an asphalt viscosity reducer is added while maintaining the temperature at 130-150℃.

6. The method for preparing aging-resistant bitumen for waterproof membranes as described in any one of claims 2-4, wherein after adding bitumen viscosity reducer, the mixture is stirred at 1000 rpm for 1-1.5 hours to obtain aging-resistant bitumen for waterproof membranes.

7. A self-adhesive waterproof membrane, obtained by using the aging-resistant bitumen for waterproof membranes as described in claim 1 or the aging-resistant bitumen for waterproof membranes prepared by any one of claims 2-6.

8. The self-adhesive waterproof membrane as described in claim 7, wherein the self-adhesive membrane coating is prepared by high-temperature mixing of the prepared waterproof membrane with aging-resistant asphalt, polymer modifier, rubber powder, and filler powder. It is made into a self-adhesive waterproof membrane.

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