A saline-alkali resistant polymer modified asphalt waterproofing membrane and its preparation method

Abstract

The present invention provides a saline-alkali resistant polymer modified asphalt waterproof coiled material and a preparation method thereof. It includes a film layer, a saline-alkali resistant asphalt layer, a base fabric layer, a saline-alkali resistant asphalt layer, and a film layer arranged in sequence from top to bottom; the material of the base fabric layer is long-fiber polyester non-woven fabric; the material of the saline-alkali resistant asphalt layer contains asphalt, modified SBS, natural polymer materials, antioxidants, and talcum powder; the material of the film layer is polyethylene; the modified SBS is prepared by graft-modifying SBS with maleic anhydride and a modified silicone monomer. The saline-alkali resistant polymer modified asphalt waterproof coiled material provided by the present invention not only has excellent waterproofing ability and saline-alkali resistance, but also has significantly improved anti-aging and high-temperature resistance, and can be widely used in the field of waterproof materials for construction projects.

Description

Technical Field

[0001] The present invention relates to waterproof materials for construction engineering, and particularly to a salt and alkali resistant polymer modified asphalt waterproof coil and a preparation method thereof. Background Art

[0002] Waterproof coils are mainly used for building walls, roofs, tunnels, highways, landfills, etc., and are flexible building materials that can be curled into a roll shape to resist external rainwater and groundwater seepage. As a leak-free connection between the engineering foundation and the building, it is the first barrier for the overall project waterproofing and plays a crucial role in the entire project.

[0003] The existing production methods of waterproof coils mainly impregnate asphalt-based or polymer-based waterproof materials onto the carcass, and the produced waterproof material products are provided in the form of coils. According to the different main component materials, they are divided into asphalt waterproof coils, polymer modified asphalt waterproof coils and synthetic polymer waterproof coils; according to the different carcasses, they are divided into non-carcass coils, paper carcass coils, fiberglass carcass coils, glass cloth carcass coils and polyethylene carcass coils.

[0004] Among them, the polymer modified asphalt waterproof coil uses polyester felt or fiberglass felt as the carcass base, and 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 waterproof coil.

[0005] Waterproof coils are required to have good water resistance, stability to temperature changes (not flowing, not bubbling, not shifting at high temperatures, not brittle at low temperatures), certain mechanical strength, elongation and fracture resistance, and certain flexibility and anti-aging properties.

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

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

[0008] The object of the present invention is to provide a saline-alkali resistant polymer modified asphalt waterproof coil with excellent saline-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 object, the present invention provides the following technical solutions: On the one hand, the present invention provides a saline-alkali resistant polymer modified asphalt waterproof coil, which includes a film layer, a saline-alkali resistant asphalt layer, a base fabric layer, a saline-alkali resistant asphalt layer, and a film layer arranged in sequence from top to bottom;

[0010] The material of the base fabric layer is long fiber polyester non-woven fabric;

[0011] The material of the saline-alkali resistant asphalt layer includes asphalt, modified SBS, natural polymer material, antioxidant and talcum powder;

[0012] The material of the film layer is polyethylene;

[0013] The modified SBS is prepared by grafting modification of SBS with maleic anhydride and modified organosilicon monomer.

[0014] In the present invention, the saline-alkali resistant asphalt layer is prepared by compounding asphalt, modified SBS, natural polymer material, antioxidant and talcum powder. Based on the waterproof performance of the asphalt material and combined with modified SBS, the saline-alkali resistance, aging resistance and thermal stability of the asphalt layer can be significantly improved. And by adding a small amount of natural polymer material with thickening ability and stabilizing ability, the saline-alkali resistance of the asphalt layer can be further enhanced.

[0015] Further, the natural polymer material is selected from at least one of carboxymethyl cellulose, methyl cellulose or hydroxypropyl cellulose.

[0016] Further, the antioxidant is selected from at least one of 2,6-di-tert-butylphenol, 2,6-di-tert-butyl-4-ethylphenol, triphenyl phosphite, tris(iso-octyl) phosphite, tris(isodecyl) phosphite or dilauryl thiodipropionate.

[0017] Further, by weight, the material of the saline-alkali resistant asphalt layer includes 50-70 parts of asphalt, 10-20 parts of modified SBS, 3-5 parts of natural polymer material, 1-3 parts of antioxidant and 5-10 parts of talcum powder.

[0018] Further, the modified organosilicon monomer is prepared by the following steps: In a reactor, add methyldiethoxysilane, catalyst and organic solvent, stir evenly and then heat to 60-80 °C, dropwise add ethyl 2-phenylacrylate, and complete the dropwise addition in 1-2 hours. After heat preservation reaction for 30-40 minutes, filter and remove the organic solvent to obtain the modified organosilicon monomer.

[0019] In the present invention, the modified organosilicon 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. It can not only make the components in the saline-alkali resistant asphalt layer disperse evenly, with excellent stability, but also make the asphalt layer and the base course and the film layer connect tightly, reducing space gaps and defects, and thus improving the waterproofing ability and saline-alkali resistance of the coil. On the other hand, the siloxane structure and the benzene ring structure can also improve the chemical stability of the modified SBS, and thus make the prepared saline-alkali resistant asphalt layer have excellent aging resistance and thermal stability.

[0020] Furthermore, the molar ratio of methyl diethoxysilane to ethyl 2-phenylacrylate is 1:1.2 - 1.3; the catalyst is tris(pentafluorophenyl)borane.

[0021] Furthermore, the modified SBS is prepared by the following steps: In a reactor, add an organic solvent and SBS, stir until SBS is dissolved, then add maleic anhydride and the modified organosilicon monomer, raise the temperature to 70 - 80 °C, add an initiator, stir and react for 6 - 8 hours, and then cool to room temperature. After filtration, washing, and drying, the modified SBS is obtained.

[0022] In the present invention, maleic anhydride and the modified organosilicon monomer are used to graft-modify SBS. By reacting with the double bond groups in the SBS molecular structure, not only can maleic anhydride and the modified organosilicon monomer be successfully grafted into the SBS molecular structure, but also the double bond structure of SBS can be destroyed, reducing its chemical activity and improving the aging resistance and thermal stability.

[0023] Furthermore, the mass ratio of SBS, maleic anhydride, and the modified organosilicon monomer is (15 - 20):(2 - 4):(3 - 5).

[0024] Furthermore, the initiator is selected from at least one of benzoyl peroxide, azobisisobutyronitrile, lauroyl peroxide, or cumene hydroperoxide.

[0025] On the other hand, the present invention also provides a preparation method of a saline-alkali resistant polymer modified asphalt waterproof coil, which is characterized by including the following steps:

[0026] (1) Heat the asphalt to 150 - 180 °C, then add the modified SBS and talcum powder, stir evenly, cool to 60 - 80 °C, add natural polymer materials and antioxidants, stir evenly, and then cool to room temperature to obtain the material for the saline-alkali resistant asphalt layer;

[0027] (2) Through the coil forming process, the base layer is placed in the middle, and the materials of the salt and alkali resistant asphalt layer prepared in step (1) are evenly coated on the upper and lower surfaces of the base layer to form a salt and alkali resistant asphalt layer. After cooling, the materials of the film layer are covered on the surface of the salt and alkali resistant asphalt layer. After length measurement, edge cutting, winding, and packaging, the salt and alkali resistant polymer modified asphalt waterproof coil is obtained.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] (1) The salt and alkali resistant polymer modified asphalt waterproof coil provided by the present invention is composed of a base layer, a salt and alkali resistant asphalt layer, and a film layer. Through the compounding of modified SBS, natural polymer materials, antioxidants, and talcum powder with the asphalt materials in the salt and alkali resistant asphalt layer, and the matching between multiple layers, the prepared waterproof coil not only has excellent waterproof and salt and alkali resistance capabilities, but also the aging resistance and high temperature resistance performances are significantly improved, thereby extending the service life and can be widely applied in the field of waterproof materials for construction projects.

[0030] (2) In the salt and alkali resistant polymer modified asphalt waterproof coil provided by the present invention, the salt and 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 materials and combined with modified SBS, the salt and alkali resistance, aging resistance, and thermal stability of the asphalt layer can be significantly improved. And by adding a small amount of natural polymer materials with thickening and stabilizing capabilities, the salt and alkali resistance of the asphalt layer can be further enhanced.

[0031] (3) In the salt and alkali resistant polymer modified asphalt waterproof coil provided by the present invention, maleic anhydride and modified organosilicon monomers are used to graft-modify SBS. By reacting with the double bond groups in the SBS molecular structure, not only can maleic anhydride and modified organosilicon monomers be successfully grafted into the SBS molecular structure, but also the double bond structure of SBS can be destroyed, reducing its chemical activity and improving the aging resistance and thermal stability.

[0032] (4) In the salt and alkali resistant polymer modified asphalt waterproof coil provided by the present invention, the modified organosilicon 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 enabling the components in the salt and alkali resistant asphalt layer to be evenly dispersed, having excellent stability, but also enabling the asphalt layer to be tightly connected with the base layer and the film layer, reducing spatial gaps and defects, thereby improving the waterproof and salt and alkali resistance capabilities of the coil; on the other hand, the siloxane structure and the benzene ring structure can also improve the chemical stability of modified SBS, thereby enabling the prepared salt and alkali resistant asphalt layer to have excellent aging resistance and thermal stability. Specific Embodiments

[0033] The present invention will be described below in conjunction with specific implementation embodiments. It should be noted that the following examples are examples of the present invention, which are only used to illustrate the present invention and not to limit the present invention. Other combinations and various improvements within the concept of the present invention can be made without departing from the gist or scope of the present invention.

[0034] 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 the technical field.

[0035] Preparation of modified silicone monomer:

[0036] The modified silicone monomer is prepared through the following steps:

[0037] In a reactor, 0.05 mol of methyldiethoxysilane, 0.1 g of tris(pentafluorophenyl)borane and 50 mL of dichloromethane were added. After stirring evenly, it was heated to 70 °C, and 0.06 mol of ethyl 2-phenylacrylate was added dropwise. The addition was completed in 2 hours. After holding the reaction for 30 minutes, it was filtered to remove dichloromethane to obtain the modified silicone monomer.

[0038] Preparation of modified SBS-1:

[0039] The modified SBS-1 is prepared through the following steps:

[0040] In a reactor, 150 mL of toluene and 15 g of SBS were added. After stirring until the SBS was dissolved, 3 g of maleic anhydride and 5 g of the modified silicone monomer were added. After heating to 80 °C, 0.3 g of benzoyl peroxide was added. After stirring and reacting for 8 hours, it was cooled to room temperature. After filtration, washing and drying, the modified SBS-1 was obtained.

[0041] Preparation of modified SBS-2:

[0042] Basically the same as the preparation of modified SBS-1, the difference is that the modified silicone monomer is replaced with an equal amount of maleic anhydride.

[0043] Preparation of modified SBS-3:

[0044] Basically the same as the preparation of modified SBS-1, the difference is that the modified silicone monomer is replaced with an equal amount of vinyltrimethoxysilane.

[0045] Example 1: A saline-alkali resistant polymer modified asphalt waterproofing membrane is prepared through the following steps:

[0046] (1)By weight, 60 parts of asphalt are heated to 160 °C, then 15 parts of modified SBS-1 and 10 parts of talcum powder are added. After stirring evenly, the temperature is lowered to 70 °C, then 3 parts of carboxyethyl cellulose and 2 parts of 2,6-di-tert-butylphenol are added. After stirring evenly, it is cooled to room temperature to obtain the material for the saline-alkali resistant asphalt layer;

[0047] (2)Through the coil forming process, the base layer is placed in the middle, and the material of the saline-alkali resistant asphalt layer prepared in step (1) is evenly coated on the upper and lower surfaces of the base layer to form a saline-alkali resistant asphalt layer. After cooling, the material of the film layer is covered on the surface of the saline-alkali resistant asphalt layer. After measuring the length, trimming the edges, winding, and packaging, the saline-alkali resistant polymer modified asphalt waterproof coil is obtained. The thickness of the base layer is 2.4 mm, the thickness of the saline-alkali resistant asphalt layer is 2 mm, and the thickness of the film layer is 0.07 mm.

[0048] Example 2: Basically the same as Example 1, the difference is that the carboxyethyl cellulose is replaced with an equal amount of methyl cellulose, and the 2,6-di-tert-butylphenol is replaced with an equal amount of triphenyl phosphite.

[0049] Example 3: Basically the same as Example 1, the difference is that the carboxyethyl cellulose is replaced with an equal amount of hydroxypropyl cellulose, and the 2,6-di-tert-butylphenol is replaced with an equal amount of dilauryl thiodipropionate.

[0050] Comparative Example 1:

[0051] A commercially available SBS modified asphalt waterproof coil with a thickness of 4.47 mm.

[0052] Comparative Example 2:

[0053] Basically the same as Example 1, the difference is that in step (1), the carboxyethyl cellulose is replaced with an equal amount of asphalt.

[0054] Comparative Example 3:

[0055] Basically the same as Example 1, the difference is that in step (1), the modified SBS-1 is replaced with an equal amount of commercially available SBS.

[0056] Comparative Example 4:

[0057] Basically the same as Example 1, the difference is that in step (1), the modified SBS-1 is replaced with an equal amount of modified SBS-2.

[0058] Comparative Example 5:

[0059] Basically the same as Example 1, the difference is that in step (1), the modified SBS-1 is replaced with an equal amount of modified SBS-3.

[0060] Performance Test

[0061] Mechanical strength test: According to the test standard of GB18242-2000 "Elastomer modified bituminous waterproofing sheets", the transverse and longitudinal tensile strengths of the products of Examples 1-3 and Comparative Examples 1-5 were tested.

[0062] Aging resistance test: According to the test standard of GB18242-2000 "Elastomer modified bituminous waterproofing sheets", artificial weathering accelerated aging was carried out on the products of Examples 1-3 and Comparative Examples 1-5, and the tensile strength retention rate of the products was tested.

[0063] Heat resistance test: According to the test standard of GB18242-2000 "Elastomer modified bituminous waterproofing sheets", the heat resistance of the products of Examples 1-3 and Comparative Examples 1-5 was tested.

[0064] The test results are shown in the following table:

[0065]

[0066] According to the comparison of the test results of Examples 1-3 and Comparative Example 1, the salt and alkali resistant polymer modified bituminous waterproofing sheets provided by the present invention have excellent mechanical strength, and strong aging resistance and heat resistance, and have a long service life.

[0067] According to the comparison of the test results of Examples 1-3 and Comparative Example 3, in the salt and alkali resistant bituminous layer of the salt and alkali resistant polymer modified bituminous waterproofing sheets provided by the present invention, by adding modified SBS, the aging resistance and heat resistance of the material can be significantly improved.

[0068] According to the comparison of the test results of Examples 1-3 and Comparative Examples 4-5, in the modified SBS of the salt and alkali resistant polymer modified bituminous waterproofing sheets provided by the present invention, by grafting and modifying SBS with a modified silicone monomer, the aging resistance and heat resistance of the material can be significantly improved through the siloxane structure and benzene ring structure.

[0069] Waterproof ability test: According to the test standard of GB18242-2000 "Elastomer modified bituminous waterproofing sheets", the 30-minute water impermeability of the products of Examples 1-3 and Comparative Examples 1-5 was tested.

[0070] Salt and alkali resistance test: According to the test method of chloride ion permeability resistance in 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.

[0071] The test results are shown in the following table:

[0072]

[0073] According to the comparison of the test results of Examples 1-3 and Comparative Example 1, it can be seen that the salt-alkali resistant polymer modified asphalt waterproof coil 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.

[0074] According to the comparison of the test results of Examples 1-3 and Comparative Example 2, it can be seen that for the salt-alkali resistant asphalt layer in the salt-alkali resistant polymer modified asphalt waterproof coil provided by the present invention, the salt-alkali resistance of the material can be further enhanced by adding natural polymer materials.

[0075] According to the comparison of the test results of Examples 1-3 and Comparative Examples 3-5, it can be seen that for the salt-alkali resistant asphalt layer in the salt-alkali resistant polymer modified asphalt waterproof coil provided by the present invention, the waterproof ability and salt-alkali resistance of the material can be further improved by adding SBS graft-modified with maleic anhydride and modified silicone monomers.

[0076] The above embodiments are only for illustrating the technical concept and characteristics of the present invention, and the purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it. It cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A saline-alkali resistant polymer modified asphalt waterproofing coil, characterized in that, It includes a film layer, a saline-alkali resistant asphalt layer, a base ply, a saline-alkali resistant asphalt layer, and a film layer which are arranged successively from top to bottom; The material of the base ply is long-fiber polyester non-woven fabric; The material of the saline-alkali resistant asphalt layer contains asphalt, modified SBS, natural polymer material, antioxidant, and talcum powder; The material of the film layer is polyethylene; The modified SBS is prepared by graft-modifying SBS with maleic anhydride and a modified silicone monomer; The modified silicone monomer is prepared by the following steps: In a reactor, add methyldiethoxysilane, a catalyst, and an organic solvent, stir evenly and then heat to 60 - 80 °C, dropwise add ethyl 2-phenylacrylate, and complete the dropping in 1 - 2 hours. After heat preservation reaction for 30 - 40 minutes, filter and remove the organic solvent to obtain the modified silicone monomer.

2. The alkali-resistant and salt-tolerant polymer modified asphalt waterproof coiled material 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 saline-alkali resistant polymer modified asphalt waterproof coiled material 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, tris(iso-octyl) phosphite, tris(isodecyl) phosphite, or dilauryl thiodipropionate; 4. The salt-tolerant and alkali-resistant polymer modified asphalt waterproof coiled material according to claim 1, characterized in that By weight, the material of the saline-alkali resistant asphalt layer contains 50 - 70 parts of asphalt, 10 - 20 parts of modified SBS, 3 - 5 parts of natural polymer material, 1 - 3 parts of antioxidant, and 5 - 10 parts of talcum powder; 5. The salt-tolerant and alkali-resistant polymer modified bitumen waterproof coiled material according to claim 1, wherein The molar ratio of methyldiethoxysilane to ethyl 2-phenylacrylate is 1:1.2 - 1.3; the catalyst is tris(pentafluorophenyl)borane; 6. The salt-tolerant and alkali-resistant polymer modified bitumen waterproof coiled material according to claim 1, wherein The modified SBS is prepared by the following steps: In a reactor, add an organic solvent and SBS, stir until SBS is dissolved, then add maleic anhydride and a modified silicone monomer, heat to 70 - 80 °C, add an initiator, stir and react for 6 - 8 hours, then cool to room temperature, filter, wash, and dry to obtain the modified SBS; 7. The salt-tolerant and alkali-resistant polymer modified asphalt waterproof coiled material according to claim 6, characterized in that, The mass ratio of SBS, maleic anhydride, and the modified silicone monomer is (15 - 20):(2 - 4):(3 - 5); 8. The salt - and alkali - resistant polymer - modified asphalt waterproof coiled material 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 preparation method of the saline-alkali resistant polymer modified asphalt waterproof coil according to any one of claims 1-8, characterized in that, It includes the following steps: (1) Heat the asphalt to 150 - 180 °C, then add modified SBS and talcum powder, stir evenly and then cool to 60 - 80 °C, add natural polymer material and antioxidant, stir evenly and then cool to room temperature to obtain the material of the saline-alkali resistant asphalt layer; (2) Through the roll forming process, place the base ply in the middle, evenly coat the material of the saline-alkali resistant asphalt layer prepared in step (1) on the upper and lower surfaces of the base ply to form a saline-alkali resistant asphalt layer. After cooling, cover the surface of the saline-alkali resistant asphalt layer with the material of the film layer, measure the length, cut the edges, wind up, and package to obtain the saline-alkali resistant polymer modified asphalt waterproof roll.

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