Saline-alkali tolerant polymer modified asphalt waterproof coiled material and preparation method thereof

Abstract

The invention provides a saline-alkaline tolerant polymer modified asphalt waterproof coiled material and a preparation method thereof. Comprising a film layer, a saline-alkali-resistant asphalt layer, a base layer, a saline-alkali-resistant asphalt layer and a film layer which are sequentially arranged from top to bottom, the tire base layer is made of a long-fiber polyester non-woven fabric; the materials of the saline-alkali resistant asphalt layer comprise asphalt, modified SBS, a natural polymer material, an antioxidant and talcum powder; the film layer is made of polyethylene; the modified SBS is prepared by grafting and modifying SBS through maleic anhydride and a modified organic silicon monomer. The saline-alkaline tolerant polymer modified asphalt waterproof coiled material provided by the invention not only has excellent waterproof capability and saline-alkaline tolerant capability, but also is remarkably improved in aging resistance and high temperature resistance, and can be widely applied to the field of waterproof materials of constructional engineering.

Description

Technical Field

[0001] The invention relates to waterproof materials for construction projects, and in particular to a salt-alkali resistant polymer modified asphalt waterproof coiled material and a preparation method thereof. Background Art

[0002] Waterproof membrane is mainly used in building walls, roofs, tunnels, roads, landfills, etc. It is a kind of flexible building material product that can be rolled into a roll to resist the leakage of rainwater and groundwater. As a leak-free connection between the engineering foundation and the building, it is the first barrier of waterproofing of the entire project and plays a vital role in the entire project.

[0003] The existing waterproofing membrane production method is mainly to impregnate asphalt or polymer waterproofing materials into the matrix, and the waterproofing material products are provided in the form of membranes. According to the main component materials, they are divided into asphalt waterproofing membranes, polymer modified asphalt waterproofing membranes and synthetic polymer waterproofing membranes; according to the different matrix, they are divided into non-matrix membranes, paper matrix membranes, glass fiber matrix membranes, glass cloth matrix membranes and polyethylene matrix membranes.

[0004] Among them, polymer modified asphalt waterproofing membrane is based on polyester felt or glass fiber felt as the base, modified asphalt as the coating material, and the content of synthetic polymer modified asphalt or oxidized asphalt as the coating material is greater than or equal to 10%. Finally, a plastic film is covered on the surface to make a rollable sheet material, which is the waterproofing membrane.

[0005] Waterproof membranes are required to have good water resistance, stability to temperature changes (no flowing, bubbling, or shaking at high temperatures, and no brittle cracking at low temperatures), certain mechanical strength, elongation, and fracture resistance, as well as certain flexibility and aging resistance.

[0006] Petroleum asphalt has disadvantages such as low softening point, high needle penetration, and low-temperature brittle cracking, so its use as a raw material for waterproofing materials is limited. At present, the country has higher and higher requirements on the life of waterproofing materials in the construction industry, so traditional petroleum asphalt waterproofing materials are gradually being eliminated because they cannot meet the standards. Adding an appropriate amount of high molecular polymer to asphalt can improve the performance of asphalt to improve the weather resistance, temperature sensitivity and adaptability of asphalt to substrate cracking. Compared with traditional asphalt waterproofing materials, polymer-modified asphalt waterproofing materials have the advantages of cold resistance, high tensile strength, low hydrophobicity and adhesion, and are more environmentally friendly. However, the salt and alkali resistance of polymer-modified asphalt waterproofing materials in the prior art still needs to be improved, and the stability is poor, which leads to insufficient aging resistance and high temperature resistance, and a short service life.

[0007] Therefore, there is an urgent need for a salt-alkali resistant polymer modified asphalt waterproof membrane with excellent salt-alkali resistance, aging resistance and high temperature resistance. Summary of the invention

[0008] The purpose of the present invention is to provide a salt-alkali resistant polymer modified asphalt waterproof membrane with excellent salt-alkali resistance, strong aging resistance and high temperature resistance and a preparation method thereof, so as to solve the problems existing in the above-mentioned background technology.

[0009] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: On the one hand, the present invention provides a salt-alkali resistant polymer modified asphalt waterproofing membrane, comprising a membrane layer, a salt-alkali resistant asphalt layer, a base layer, a salt-alkali resistant asphalt layer, and a membrane layer arranged in sequence from top to bottom; The material of the tire base layer is long-fiber polyester non-woven fabric; The materials of the salt-alkali resistant asphalt layer include asphalt, modified SBS, natural polymer materials, antioxidants and talcum powder; The material of the film layer is polyethylene; The modified SBS is prepared by grafting and modifying SBS with maleic anhydride and modified organic silicon monomer.

[0010] The salt-alkali resistant asphalt layer in the present invention is prepared by compounding asphalt, modified SBS, natural polymer materials, antioxidants and talcum powder. Based on the waterproof performance of the asphalt material combined with the modified SBS, the salt-alkali resistance, aging resistance and thermal stability of the asphalt layer can be significantly improved, and the salt-alkali resistance of the asphalt layer can be further enhanced by adding a small amount of natural polymer materials with thickening and stabilizing capabilities.

[0011] Furthermore, the natural polymer material is selected from at least one of carboxyethyl cellulose, methyl cellulose or hydroxypropyl cellulose.

[0012] Furthermore, the antioxidant is selected from at least one of 2,6-di-tert-butylphenol, 2,6-di-tert-butyl-4-ethylphenol, triphenyl phosphite, triisooctyl phosphite, triisodecyl phosphite or dilauryl thiodipropionate.

[0013] Furthermore, the material of the salt-alkali resistant asphalt layer comprises, by weight, 50-70 parts of asphalt, 10-20 parts of modified SBS, 3-5 parts of natural polymer materials, 1-3 parts of antioxidants and 5-10 parts of talc.

[0014] Furthermore, the modified silicone monomer is prepared by the following steps: adding methyldiethoxysilane, a catalyst and an organic solvent into a reactor, stirring evenly and heating to 60-80°C, adding ethyl 2-phenylacrylate dropwise for 1-2 hours, keeping the reaction warm for 30-40 minutes, filtering and removing the organic solvent to obtain the modified silicone monomer.

[0015] The modified silicone monomer in the present invention contains a siloxane structure and a benzene ring structure. On the one hand, the siloxane structure can improve the compatibility between organic materials and inorganic materials, not only making the components between the salt-alkali resistant asphalt layers evenly dispersed and having excellent stability, but also making the asphalt layer tightly connected with the tire base layer and the membrane layer, reducing space gaps and defects, thereby improving the waterproof ability and salt-alkali resistance of the coiled material; on the other hand, the siloxane structure and the benzene ring structure can also improve the chemical stability of the modified SBS, thereby making the prepared salt-alkali resistant asphalt layer have excellent aging resistance and thermal stability.

[0016] Furthermore, the molar ratio of the methyldiethoxysilane to ethyl 2-phenylacrylate is 1:1.2-1.3; and the catalyst is tris(pentafluorophenyl)borane.

[0017] Furthermore, the modified SBS is prepared by the following steps: adding an organic solvent and SBS into a reactor, stirring until the SBS is dissolved, then adding maleic anhydride and a modified silicone monomer, heating to 70-80° C., adding an initiator, stirring for reaction for 6-8 hours, then cooling to room temperature, filtering, washing, and drying to obtain the modified SBS.

[0018] The invention grafts and modifies SBS by maleic anhydride and modified organic silicon monomers, and reacts with double bond groups in the molecular structure of SBS, so that not only can maleic anhydride and modified organic silicon monomers be successfully grafted into the molecular structure of SBS, but also the double bond structure of SBS can be destroyed, the chemical activity of SBS can be reduced, and the aging resistance and thermal stability can be improved.

[0019] Furthermore, the mass ratio of the SBS, maleic anhydride and modified silicone monomer is (15-20): (2-4): (3-5).

[0020] Furthermore, the initiator is selected from at least one of benzoyl peroxide, azobisisobutyronitrile, lauroyl peroxide or cumene hydroperoxide.

[0021] On the other hand, the present invention also provides a method for preparing a salt-alkali resistant polymer modified asphalt waterproofing membrane, characterized in that it comprises the following steps: (1) After heating the asphalt to 150-180°C, add modified SBS and talcum powder, stir evenly, cool to 60-80°C, add natural polymer materials and antioxidants, stir evenly, and cool to room temperature to obtain a salt-alkali resistant asphalt layer material; (2) After the roll forming process, the base layer is placed in the middle, and the material of the salt-alkali resistant asphalt layer prepared in step (1) is evenly coated on the upper and lower surfaces of the base layer to form a salt-alkali resistant asphalt layer. After cooling, the material of the film layer is covered on the surface of the salt-alkali resistant asphalt layer. After measuring the length, trimming, rolling and packaging, the salt-alkali resistant polymer modified asphalt waterproof roll material is obtained.

[0022] Compared with the prior art, the present invention has the following beneficial effects: (1) The salt-alkali resistant polymer modified asphalt waterproofing membrane provided by the present invention is composed of a base layer, a salt-alkali resistant asphalt layer and a membrane layer. By compounding modified SBS, natural polymer materials, antioxidants and talcum powder with the asphalt material in the salt-alkali resistant asphalt layer, and matching the multi-layer structure, the prepared waterproofing membrane not only has excellent waterproof ability and salt-alkali resistance, but also has significantly improved aging resistance and high temperature resistance, thereby extending the service life. It can be widely used in the field of waterproofing materials for construction projects.

[0023] (2) In the salt-alkali resistant polymer modified asphalt waterproofing membrane provided by the present invention, the salt-alkali resistant asphalt layer is prepared by compounding asphalt, modified SBS, natural polymer materials, antioxidants and talcum powder. Based on the waterproof performance of the asphalt material combined with the modified SBS, the salt-alkali resistance, aging resistance and thermal stability of the asphalt layer can be significantly improved, and the salt-alkali resistance of the asphalt layer can be further enhanced by adding a small amount of natural polymer materials with thickening and stabilizing capabilities.

[0024] (3) In the salt-alkali resistant polymer modified asphalt waterproofing membrane provided by the present invention, SBS is grafted and modified by maleic anhydride and modified silicone monomers. By reacting with the double bond groups in the molecular structure of SBS, not only can the maleic anhydride and modified silicone monomers be successfully grafted into the molecular structure of SBS, but the double bond structure of SBS can also be destroyed, thereby reducing its chemical activity and improving its aging resistance and thermal stability.

[0025] (4) In the salt-alkali resistant polymer modified asphalt waterproofing membrane provided by the present invention, the modified silicone monomer contains a siloxane structure and a benzene ring structure. On the one hand, the siloxane structure can improve the compatibility between organic materials and inorganic materials, not only making the components between the salt-alkali resistant asphalt layers evenly dispersed and having excellent stability, but also making the asphalt layer tightly connected with the base layer and the membrane layer, reducing spatial gaps and defects, thereby improving the waterproofing ability and salt-alkali resistance of the membrane; on the other hand, the siloxane structure and the benzene ring structure can also improve the chemical stability of the modified SBS, thereby making the prepared salt-alkali resistant asphalt layer have excellent aging resistance and thermal stability. DETAILED DESCRIPTION

[0026] The present invention will be described below in conjunction with specific embodiments. It should be noted that the following embodiments are examples of the present invention and are only used to illustrate the present invention, but not to limit the present invention. Other combinations and various modifications within the concept of the present invention may be performed without departing from the spirit or scope of the present invention.

[0027] The commercially available SBS modified asphalt waterproofing membrane was purchased from Weifang Rongjing Waterproof Engineering Co., Ltd.; the commercially available SBS was thermoplastic rubber SBS, D1101 JO, purchased from Dongguan Baojia Plastic Co., Ltd.; the asphalt was 90# asphalt; the long-fiber polyester non-woven fabric was purchased from Dezhou Aoxiang Geotechnical Materials Co., Ltd.; the remaining reagents and equipment were conventional reagents and equipment in this technical field.

[0028] Preparation of modified silicone monomer: The modified silicone monomer was prepared by the following steps: In the reactor, 0.05 mol of methyldiethoxysilane, 0.1 g of tri(pentafluorophenyl)borane and 50 mL of dichloromethane were added, stirred evenly and heated to 70°C, 0.06 mol of ethyl 2-phenylacrylate was added dropwise, and the addition was completed within 2 hours. After keeping the reaction warm for 30 minutes, the modified silicone monomer was obtained by filtering and removing dichloromethane.

[0029] Preparation of modified SBS-1: The modified SBS-1 was prepared by the following steps: 150 mL of toluene and 15 g of SBS were added to the reactor, and after stirring until the SBS was dissolved, 3 g of maleic anhydride and 5 g of modified silicone monomer were added. After heating to 80° C., 0.3 g of benzoyl peroxide was added. After stirring for 8 hours, the mixture was cooled to room temperature, filtered, washed, and dried to obtain the modified SBS-1.

[0030] Preparation of modified SBS-2: The preparation is basically the same as that of modified SBS-1, except that the modified silicone monomer is replaced by an equal amount of maleic anhydride.

[0031] Preparation of modified SBS-3: The preparation is basically the same as that of modified SBS-1, except that the modified silicone monomer is replaced by an equal amount of vinyltrimethoxysilane.

[0032] Example 1: A salt-alkali resistant polymer modified asphalt waterproofing membrane is prepared by the following steps: (1) According to weight, 60 parts of asphalt are heated to 160°C, 15 parts of modified SBS-1 and 10 parts of talcum powder are added, the mixture is stirred evenly, the temperature is lowered to 70°C, 3 parts of carboxyethyl cellulose and 2 parts of 2,6-di-tert-butylphenol are added, the mixture is stirred evenly, and the mixture is cooled to room temperature to obtain a salt-alkali resistant asphalt layer material; (2) After the roll forming process, the base layer is placed in the middle, and the material of the salt-alkali resistant asphalt layer prepared in step (1) is evenly coated on the upper and lower surfaces of the base layer to form a salt-alkali resistant asphalt layer. After cooling, the material of the film layer is covered on the surface of the salt-alkali resistant asphalt layer. After measuring the length, trimming, rolling and packaging, the salt-alkali resistant polymer modified asphalt waterproof roll material is obtained. The thickness of the base layer is 2.4 mm, the thickness of the salt-alkali resistant asphalt layer is 2 mm, and the thickness of the film layer is 0.07 mm.

[0033] Example 2: Basically the same as Example 1, except that carboxyethyl cellulose is replaced by an equal amount of methyl cellulose, and 2,6-di-tert-butylphenol is replaced by an equal amount of triphenyl phosphite.

[0034] Example 3: The same as Example 1, except that carboxyethyl cellulose is replaced by an equal amount of hydroxypropyl cellulose, and 2,6-di-tert-butylphenol is replaced by an equal amount of dilauryl thiodipropionate.

[0035] Comparative Example 1: Commercially available SBS modified asphalt waterproofing membrane has a thickness of 4.47 mm.

[0036] Comparative Example 2: The process is basically the same as Example 1, except that the carboxyethyl cellulose in step (1) is replaced by an equal amount of asphalt.

[0037] Comparative Example 3: The process is basically the same as Example 1, except that the modified SBS-1 in step (1) is replaced by an equal amount of commercially available SBS.

[0038] Comparative Example 4: The process is basically the same as Example 1, except that the modified SBS-1 in step (1) is replaced by an equal amount of modified SBS-2.

[0039] Comparative Example 5: The process is basically the same as Example 1, except that the modified SBS-1 in step (1) is replaced by an equal amount of modified SBS-3.

[0040] Performance Testing Mechanical strength test: According to the testing standard of GB18242-2000 "Elastomer modified asphalt waterproofing membrane", the horizontal and vertical tensile forces of the products of Examples 1-3 and Comparative Examples 1-5 were tested.

[0041] Aging resistance test: According to the testing standard of GB18242-2000 "Elastomer modified asphalt waterproofing membrane", the products of Examples 1-3 and Comparative Examples 1-5 were subjected to artificial climate accelerated aging to test the tensile retention rate of the products.

[0042] Heat resistance test: According to the test standard of GB18242-2000 "Elastomer modified asphalt waterproofing membrane", the heat resistance of the products of Examples 1-3 and Comparative Examples 1-5 was tested.

[0043] The test results are shown in the following table:

[0044] According to the comparison of the test results of Examples 1-3 with those of Comparative Example 1, it can be seen that the salt-alkali resistant polymer modified asphalt waterproof membrane provided by the present invention has excellent mechanical strength, strong aging resistance and heat resistance, and a long service life.

[0045] According to the comparison of the test results of Examples 1-3 and Comparative Example 3, it can be seen that the salt-alkali resistant asphalt layer in the salt-alkali resistant polymer modified asphalt waterproof membrane provided by the present invention can significantly improve the aging resistance and heat resistance of the material by adding modified SBS.

[0046] According to the comparison of the test results of Examples 1-3 and Comparative Examples 4-5, it can be seen that the modified SBS in the salt-alkali resistant polymer modified asphalt waterproof membrane provided by the present invention is grafted with modified silicone monomers to significantly improve the aging resistance and heat resistance of the material through the siloxane structure and the benzene ring structure.

[0047] Waterproof ability test: According to the test standard of GB18242-2000 "Elastomer modified bitumen waterproof membrane", the 30-minute water impermeability of the products of Examples 1-3 and Comparative Examples 1-5 was tested.

[0048] Salt and alkali resistance test: According to the chloride ion permeability resistance test method of JTJ 275-2000 "Technical Specification for Corrosion Protection of Concrete Structures in Harbor Engineering", the anti-ion permeability of the products of Examples 1-3 and Comparative Examples 1-5 was tested.

[0049] The test results are shown in the following table:

[0050] According to the comparison of the test results of Examples 1-3 with those of Comparative Example 1, it can be seen that the salt-alkali resistant polymer modified asphalt waterproof membrane provided by the present invention has excellent waterproof performance and salt-alkali resistance, and can be widely used in the field of waterproof materials for construction projects.

[0051] According to the comparison of the test results of Examples 1-3 and Comparative Example 2, it can be seen that the salt-alkali resistant asphalt layer in the salt-alkali resistant polymer modified asphalt waterproof membrane provided by the present invention can further enhance the salt-alkali resistance of the material by adding natural polymer materials.

[0052] According to the comparison of the test results of Examples 1-3 and Comparative Examples 3-5, it can be seen that the salt-alkali resistant asphalt layer in the salt-alkali resistant polymer modified asphalt waterproof membrane provided by the present invention can further improve the waterproof ability and salt-alkali resistance of the material by adding SBS grafted with maleic anhydride and modified silicone monomer.

[0053] The above implementation modes are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A salt-alkali resistant polymer modified asphalt waterproofing membrane, characterized in that: It includes a membrane layer, a salt-alkali resistant asphalt layer, a tread base layer, a salt-alkali resistant asphalt layer, and a membrane layer arranged in sequence from top to bottom; The material of the tire base layer is long-fiber polyester non-woven fabric; The materials of the salt-alkali resistant asphalt layer include asphalt, modified SBS, natural polymer materials, antioxidants and talcum powder; The material of the film layer is polyethylene; The modified SBS is prepared by grafting maleic anhydride and modified organosilicon monomer onto SBS; The modified silicone monomer is prepared by the following steps: adding methyldiethoxysilane, a catalyst and an organic solvent into a reactor, stirring evenly and heating to 60-80° C., adding ethyl 2-phenylacrylate dropwise for 1-2 hours, keeping the reaction warm for 30-40 minutes, filtering and removing the organic solvent to obtain the modified silicone monomer.

2. The salt-alkali resistant polymer modified asphalt waterproofing membrane according to claim 1, characterized in that: The natural polymer material is selected from at least one of carboxyethyl cellulose, methyl cellulose or hydroxypropyl cellulose.

3. The salt-alkali resistant polymer modified asphalt waterproofing membrane according to claim 1, characterized in that: The antioxidant is selected from at least one of 2,6-di-tert-butylphenol, 2,6-di-tert-butyl-4-ethylphenol, triphenyl phosphite, triisooctyl phosphite, triisodecyl phosphite and dilauryl thiodipropionate.

4. The salt-alkali resistant polymer modified asphalt waterproofing membrane according to claim 1, characterized in that: In terms of weight, the material of the salt-alkali resistant asphalt layer comprises 50-70 parts of asphalt, 10-20 parts of modified SBS, 3-5 parts of natural polymer materials, 1-3 parts of antioxidants and 5-10 parts of talc.

5. The salt-alkali resistant polymer modified asphalt waterproofing membrane according to claim 1, characterized in that: The molar ratio of methyldiethoxysilane to 2-phenylethyl acrylate is 1:1.2-1.3; and the catalyst is tri(pentafluorophenyl)borane.

6. The salt-alkali resistant polymer modified asphalt waterproofing membrane according to claim 1, characterized in that: The modified SBS is prepared by the following steps: adding an organic solvent and SBS into a reactor, stirring until the SBS is dissolved, then adding maleic anhydride and a modified silicone monomer, heating to 70-80° C., adding an initiator, stirring for reaction for 6-8 hours, then cooling to room temperature, filtering, washing, and drying to obtain the modified SBS.

7. The salt-alkali resistant polymer modified asphalt waterproofing membrane according to claim 6, characterized in that: The mass ratio of the SBS, maleic anhydride and modified silicone monomer is (15-20): (2-4): (3-5).

8. The salt-alkali resistant polymer modified asphalt waterproofing membrane according to claim 6, characterized in that: The initiator is selected from at least one of benzoyl peroxide, azobisisobutyronitrile, lauroyl peroxide or cumene hydroperoxide.

9. The method for preparing the salt-alkali resistant polymer modified asphalt waterproofing membrane according to any one of claims 1 to 8, characterized in that: The following steps are involved: (1) After heating the asphalt to 150-180°C, add modified SBS and talcum powder, stir evenly, cool to 60-80°C, add natural polymer materials and antioxidants, stir evenly, and cool to room temperature to obtain a salt-alkali resistant asphalt layer material; (2) After the roll forming process, the base layer is placed in the middle, and the material of the salt-alkali resistant asphalt layer prepared in step (1) is evenly coated on the upper and lower surfaces of the base layer to form a salt-alkali resistant asphalt layer. After cooling, the material of the film layer is covered on the surface of the salt-alkali resistant asphalt layer. After measuring the length, trimming, rolling and packaging, the salt-alkali resistant polymer modified asphalt waterproof roll material is obtained.

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