Lignin modified thermoplastic elastomer waterproof coiled material as well as preparation method and application thereof

Abstract

The invention discloses a lignin-modified thermoplastic elastomer waterproof coiled material as well as a preparation method and application thereof. The waterproof coiled material is prepared from the following components in parts by mass: 20-60 parts of polypropylene, 30-50 parts of an elastomer, 0.1-20 parts of lignin, 0-3 parts of an additive A, 0-3 parts of an additive B and 0-3 parts of an additive C. The lignin is utilized to effectively endow the waterproof coiled material with anti-aging and anti-ultraviolet functions, and the waterproof coiled material has good mechanical and waterproof properties.

Description

Technical Field

[0001] The invention belongs to the field of polymer materials, and in particular relates to a lignin-modified thermoplastic elastomer waterproof coiled material and a preparation method and application thereof. Background Art

[0002] Building roofs, building exterior walls, tunnels, roads, landfills and other places all need to be waterproofed to varying degrees to prevent water seepage and leakage, affecting the service life of buildings, roads, etc. or causing pollution and other hazards. In general waterproofing construction, the use of waterproofing membranes as a way to prevent seepage and leakage plays a vital role. There are two main types of waterproofing membranes: asphalt waterproofing membranes and rubber-plastic waterproofing membranes. Asphalt waterproofing membranes generally use base paper, fiber felt, etc. as the matrix material, dip asphalt, and sprinkle powdered, granular or sheet materials on the surface to make a rollable sheet waterproof material. Although asphalt waterproofing membranes are low in cost, they have problems such as poor tensile strength and low elongation, and are greatly affected by temperature. They are easily deformed in high temperature environments and easily brittle in low temperature environments, resulting in poor waterproofing performance and aging resistance, affecting the service life. Rubber-plastic waterproof membrane is based on synthetic rubber, synthetic resin or thermoplastic elastomer, with fillers and additives added, and is processed into a rollable sheet waterproof material. It is a relatively new waterproof material with strong waterproof, puncture-proof and penetration-proof functions, good weather resistance, but high cost.

[0003] With the advancement of green waterproofing membranes, the application of biomass materials in them has become one of the development directions. Lignin is one of the three major components in plants, and industrial lignin, as a by-product of the pulp and paper industry and the biorefining industry, is mostly burned to recover heat energy, with low utilization rate. As a natural polymer material, lignin has a three-dimensional network structure and has anti-ultraviolet and anti-aging functions. Its application in materials can give the materials anti-aging and anti-ultraviolet functions, and the application of biomass materials is conducive to reducing carbon emissions. Some technicians have applied lignin to waterproofing membranes.

[0004] Patent application 201510234257.8 (A low-cost and efficient maleic acid grafted polyethylene modified asphalt waterproofing membrane and its preparation method) discloses the use of maleic acid grafted polyethylene modified asphalt as a waterproofing membrane to improve the toughness of asphalt. Patent application 202110852199.0 (An anti-aging composite waterproofing membrane and its preparation method) discloses that after chemical modification of lignin, it is added to asphalt, styrene-butadiene rubber and other materials to improve the anti-aging performance of the waterproofing membrane, but its modification process is complicated. Patent application 202210086896.4 (A modified asphalt waterproofing membrane and its preparation process) discloses an asphalt waterproofing membrane composed of composite asphalt, lignin-zinc oxide composite powder, waste rubber powder, paraffin oil, monostearate glycerol, light stabilizer, anti-aging agent, accelerator, etc., wherein the lignin used is sodium lignin sulfonate, which is too hydrophilic and not conducive to waterproofing. Patent application 202210499656.7 (A high-strength elastic polymer modified asphalt and its preparation and waterproofing membrane and its preparation and application and airport runway structure system) discloses an asphalt waterproofing membrane composed of petroleum asphalt, SBS, SIS, urea-formaldehyde modified enzymatic lignin, additives and inorganic fillers, wherein the enzymatic lignin is modified by NaOH, formaldehyde and urea, and the modified product is used to reinforce SBS. Patent application 200910172726.2 (A modified asphalt composite material for waterproofing membrane containing straw ethanol fermentation residue and its preparation method) discloses a modified asphalt composite material for waterproofing membrane containing straw ethanol fermentation residue, wherein the straw ethanol fermentation residue is produced in the process of cellulosic ethanol production, and the main component is lignin and its derivatives. Patent application 202311857791.5 (a method for preparing asphalt pre-laid waterproofing membrane) discloses adding petroleum asphalt and styrene-butadiene-styrene block copolymer into a reactor for heating and stirring, and then adding modified lignin and filler for stirring to obtain asphalt material, wherein the modified lignin is obtained by reacting rosin acid chloride, lignin, 4-dimethylaminopyridine, and N,N dimethylformamide in DMF. Patent application 202310707731.9 (a chlorinated polyethylene waterproofing membrane) discloses using chlorinated polyethylene as the main waterproofing membrane and lignin as a functional component that is resistant to light and heat aging; the lignin is processed through six steps of pretreatment, ball milling, pre-dispersion, mixing, extrusion, and calendering. During the ball milling process, anhydrous ethanol, triethoxypropylsilane, potassium perfluorohexylsulfonate, etc. are added to react to reduce the surface polarity of lignin. Patent application 201711167417.7 (A lignin-modified asphalt waterproofing membrane and its preparation method) discloses a modified asphalt waterproofing membrane material containing phenolized lignin. Sodium lignin sulfonate is chemically modified with a phenol solution to obtain phenolized lignin, and a silane coupling agent is used to improve the stability of lignin in asphalt.Patent application 201711168889.4 (A lignin and coupling agent synergistic modified asphalt waterproofing membrane and its production method) discloses a modified asphalt waterproofing membrane material containing phenolized lignin, which uses a silane coupling agent to improve stability. Patent application 201510234209.9 (A weather-resistant and highly heat-resistant modified asphalt waterproofing membrane and its preparation method) discloses a weather-resistant and highly heat-resistant modified asphalt waterproofing membrane with carboxylated styrene butadiene glue and high-glue powder modified asphalt as the base material. Patent application 202410122682.7 (A wear-resistant polymer waterproofing membrane and its preparation method) discloses a wear-resistant polymer waterproofing membrane material, which also uses sodium lignin sulfonate and silane coupling agent. Patent application 201510458998.4 (a heat-resistant asphalt waterproofing membrane) discloses a heat-resistant asphalt-based waterproofing membrane, wherein alkali lignin reacts with tea saponin and epichlorohydrin to obtain epoxidized lignin, thereby increasing the crosslinking degree of lignin molecules and improving the insulation and thermal stability of asphalt materials. Patent application 201510459046.4 (a light asphalt waterproofing membrane) discloses a light asphalt-based waterproofing membrane, wherein alkali lignin is treated with epoxy to increase the crosslinking degree of lignin molecules and improve the insulation and thermal stability of asphalt materials. Patent application 201510458997.X (a fiber-reinforced asphalt waterproofing membrane) discloses a fiber-reinforced asphalt waterproofing membrane, wherein alkali lignin reacts with tea saponin and epichlorohydrin to obtain epoxidized lignin, thereby increasing the crosslinking degree of lignin molecules. Patent application 202311174208.0 (A thermoplastic polyolefin waterproofing membrane and its preparation method) discloses a thermoplastic polyolefin waterproofing membrane with thermoplastic polyolefin, vulcanized butadiene rubber, natural rubber, lignin, and magnesium hydroxide as the main materials, but does not involve specific lignin and treatment methods. Patent application 202410085368.6 (A thermoplastic rubber waterproofing membrane and its preparation method) discloses a thermoplastic rubber waterproofing membrane with polypropylene resin, rubber, filler, stearic acid, and composite alumina as the main materials, and lignin is also added, but its treatment method and function are not described. Patent application 201510498979.4 discloses a technology of using softened oil-bridged modified asphalt as a waterproof membrane, using softened oil (composed of one or more mixed oils of mineral oil, synthetic oil, semi-synthetic oil or vegetable oil), and the bridging agent involved is a silane compound, lignin, titanate compound, phosphate compound or bimetallic compound, wherein lignin is used as a bridging agent.

[0005] Although the above patent applications report the application of lignin in waterproofing membranes, they still face a common problem, that is, the anti-aging and anti-ultraviolet functions of lignin in waterproofing membranes cannot be fully utilized, and the waterproofing membranes prepared using lignin still have the problems of low mechanical properties, poor anti-aging and anti-ultraviolet properties. Therefore, how to use lignin to simultaneously improve the mechanical properties, anti-aging and anti-ultraviolet properties of waterproofing membranes and have good waterproofing properties is of great significance to obtaining waterproofing membranes with excellent comprehensive performance. Summary of the invention

[0006] In order to solve the shortcomings and deficiencies of the prior art, the primary purpose of the present invention is to provide a lignin-modified thermoplastic elastomer waterproof membrane, which utilizes lignin to effectively give the waterproof membrane anti-aging and anti-ultraviolet functions, while also having good mechanical and waterproof properties.

[0007] Another object of the present invention is to provide a method for preparing the above-mentioned lignin-modified thermoplastic elastomer waterproof membrane.

[0008] Another object of the present invention is to provide an application of the above-mentioned lignin-modified thermoplastic elastomer waterproofing membrane.

[0009] The purpose of the present invention is achieved through the following technical solutions:

[0010] A lignin-modified thermoplastic elastomer waterproofing membrane is prepared by comprising the following components by weight:

[0011] 20 to 60 parts of polypropylene, 30 to 50 parts of elastomer, 0.1 to 20 parts of lignin, 0 to 3 parts of additive A, 0 to 3 parts of additive B and 0 to 3 parts of additive C, wherein the additives A, B and C are not zero.

[0012] Preferably, the lignin-modified thermoplastic elastomer waterproofing membrane is prepared by comprising the following components in parts by mass:

[0013] 35-50 parts of polypropylene, 30-45 parts of elastomer, 0.6-10 parts of lignin, 1-3 parts of additive A, 0.03-0.5 parts of additive B and 0.03-0.5 parts of additive C.

[0014] More preferably, the lignin-modified thermoplastic elastomer waterproof membrane is prepared by comprising the following components in parts by mass:

[0015] 35-50 parts of polypropylene, 30-45 parts of elastomer, 0.6-6 parts of lignin, 1-3 parts of additive A, 0.03-0.3 parts of additive B and 0.03-0.3 parts of additive C.

[0016] Preferably, the molecular weight of the polypropylene is in the range of 80,000 to 150,000 g / mol, it is stable to water, the water absorption in water for 14 hours does not exceed 0.01%, and the melt flow rate is 4.0 g / 10 min (230°C / 2.16 kg); more preferably, it is at least one of ExxonMobil 7032E2, 7032E3 and 7032KN.

[0017] Preferably, the elastomer is at least one of ethylene-octene copolymer (POE) and styrene-butadiene-styrene (SBS); more preferably, the elastomer is at least one of Dow Chemical ENGAGE 8150, 8157, 8180, 6102 and KRATOND1101.

[0018] Preferably, the lignin is at least one of alkali lignin and enzymatic lignin, and the lignin is solid powder with a moisture content of less than 3% and a particle size range of D50 less than 10 μm.

[0019] Preferably, the additive A is maleic anhydride.

[0020] Preferably, the additive B is at least one of 1,2,4-triazole, imidazole, 3,5-diamino-1,2,4-triazole and 3-amino-1,2,4-triazole; more preferably, it is 3-amino-1,2,4-triazole.

[0021] Preferably, the additive C is at least one of zinc chloride, ferric chloride, zinc acetate and zinc stearate; more preferably zinc stearate.

[0022] Preferably, the lignin-modified thermoplastic elastomer waterproofing membrane comprises 0 to 1 parts of antioxidant by weight; more preferably, 0.4 to 1 parts of antioxidant.

[0023] More preferably, the antioxidant is at least one of antioxidant 1010, antioxidant 1076, antioxidant 168 and antioxidant B225.

[0024] Preferably, the lignin-modified thermoplastic elastomer waterproof membrane comprises 0 to 1 parts of light stabilizer by weight; more preferably, 0.5 to 1 parts of light stabilizer.

[0025] More preferably, the light stabilizer is a hindered amine light stabilizer, and further preferably is BASF 2020 light stabilizer.

[0026] Preferably, the lignin-modified thermoplastic elastomer waterproofing membrane comprises 0 to 10 parts by mass of titanium dioxide; more preferably 5 to 10 parts by mass of titanium dioxide.

[0027] Preferably, the lignin-modified thermoplastic elastomer waterproofing membrane comprises 10 to 30 parts of filler by weight; more preferably, 10 to 15 parts of filler.

[0028] More preferably, the filler is an inorganic filler, more preferably light calcium carbonate.

[0029] The preparation method of the lignin-modified thermoplastic elastomer waterproofing membrane comprises the following steps:

[0030] (1) Mix all the raw materials in a mixer;

[0031] (2) The materials uniformly mixed in step (1) are melt-blended, extruded, sheeted, and rolled through a twin-screw extruder to obtain a lignin-modified thermoplastic elastomer waterproofing membrane.

[0032] Preferably, the rotation speed of the mixer in step (1) is 200 to 2000 r / min, and the mixing time is 1 to 5 min.

[0033] Preferably, the temperature of the melt blending in step (2) is 150-230° C., the screw speed is 100-350 r / min, and the vacuum degree is 0-0.08 MPa.

[0034] The application of the above lignin modified thermoplastic elastomer waterproof membrane in the waterproofing field.

[0035] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0036] (1) The preparation and production process of the lignin-modified thermoplastic elastomer waterproofing membrane of the present invention is simple; the use of biomass materials in the material can not only reduce costs but also improve the utilization rate of biomass resources, which has the significance of carbon reduction.

[0037] (2) The present invention effectively exerts the anti-aging and anti-ultraviolet functions of lignin by designing a composite system of polypropylene, elastomer, lignin and additive ABC, and endows the composite system, i.e., the waterproof membrane, with excellent anti-aging and anti-ultraviolet properties. At the same time, the addition of lignin has no negative effect on the mechanical properties and waterproof properties of the system, i.e., it can effectively maintain the mechanical properties and waterproof properties of the waterproof membrane, thereby obtaining a waterproof membrane with excellent comprehensive performance. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto.

[0039] If no specific conditions are specified in the examples of the present invention, the experiments were carried out under conventional conditions or conditions recommended by the manufacturer. All raw materials, reagents, etc., whose manufacturers are not specified, are conventional products that can be purchased commercially.

[0040] The numbers of parts mentioned in the embodiments and comparative examples of the present invention are all by mass, and the numbers of parts can be enlarged or reduced in the same proportion.

[0041] Example 1

[0042] 35 parts of polypropylene (ExxonMobil 7032E2), 45 parts of polyolefin elastomer (Dow Chemical ENGAGE 8150), 0.6 parts of alkali lignin (water content less than 3%, D50 less than 10 μm), 1 part of maleic anhydride, 0.03 parts of 3-amino-1,2,4-triazole, 0.03 parts of zinc stearate, 0.4 parts of antioxidant 1010, 0.5 parts of light stabilizer 2020, 5 parts of titanium dioxide, and 15 parts of light calcium carbonate were mixed evenly in a mixer for 3 minutes at a speed of 500 r / min.

[0043] The above mixture was added into a twin-screw extruder and melt-blended at 190° C., with a screw speed of 300 r / min and a vacuum degree of -0.06 MPa. After blending, the mixture was extruded into a sheet shape and rolled up to prepare a lignin-modified thermoplastic elastomer waterproof roll material.

[0044] Example 2

[0045] 35 parts of polypropylene (ExxonMobil 7032E2), 45 parts of polyolefin elastomer (Dow Chemical ENGAGE 8150), 1 part of alkali lignin (water content less than 3%, D50 less than 10 μm), 1 part of maleic anhydride, 0.04 parts of 3-amino-1,2,4-triazole, 0.04 parts of zinc stearate, 0.4 parts of antioxidant 1010, 0.5 parts of light stabilizer 2020, 5 parts of titanium dioxide, and 15 parts of light calcium carbonate were mixed evenly in a mixer for 3 minutes at a speed of 500 r / min.

[0046] The above mixture was added into a twin-screw extruder and melt-blended at 190° C., with a screw speed of 300 r / min and a vacuum degree of -0.06 MPa. After blending, the mixture was extruded into a sheet shape and rolled up to prepare a lignin-modified thermoplastic elastomer waterproof roll material.

[0047] Example 3

[0048] 50 parts of polypropylene (ExxonMobil 7032E2), 30 parts of polyolefin elastomer (Dow Chemical ENGAGE 8150), 1 part of alkali lignin (water content less than 3%, D50 less than 10 μm), 1 part of maleic anhydride, 0.05 parts of 3-amino-1,2,4-triazole, 0.05 parts of zinc stearate, 0.4 parts of antioxidant 1010, 0.5 parts of light stabilizer 2020, 5 parts of titanium dioxide, and 15 parts of light calcium carbonate were mixed evenly in a mixer for 3 minutes at a speed of 500 r / min.

[0049] The above mixture was added into a twin-screw extruder and melt-blended at 190° C., with a screw speed of 300 r / min and a vacuum degree of -0.06 MPa. After blending, the mixture was extruded into a sheet shape and rolled up to prepare a lignin-modified thermoplastic elastomer waterproof roll material.

[0050] Example 4

[0051] 35 parts of polypropylene (ExxonMobil 7032E2), 45 parts of polyolefin elastomer (Dow Chemical ENGAGE 8150), 6 parts of alkali lignin (water content less than 3%, D50 less than 10 μm), 1 part of maleic anhydride, 0.3 parts of 3-amino-1,2,4-triazole, 0.3 parts of zinc stearate, 0.4 parts of antioxidant 1010, 0.5 parts of light stabilizer 2020, 5 parts of titanium dioxide, and 15 parts of light calcium carbonate were mixed evenly in a mixer for 3 minutes at a speed of 500 r / min.

[0052] The above mixture was added into a twin-screw extruder and melt-blended at 190° C., with a screw speed of 300 r / min and a vacuum degree of -0.06 MPa. After blending, the mixture was extruded into a sheet shape and rolled up to prepare a lignin-modified thermoplastic elastomer waterproof roll material.

[0053] Example 5

[0054] 35 parts of polypropylene (ExxonMobil 7032E2), 45 parts of polyolefin elastomer (Dow Chemical ENGAGE 8150), 10 parts of alkali lignin (water content less than 3%, D50 less than 10 μm), 1 part of maleic anhydride, 0.5 parts of 3-amino-1,2,4-triazole, 0.5 parts of zinc stearate, 0.4 parts of antioxidant 1010, 0.5 parts of light stabilizer 2020, 5 parts of titanium dioxide, and 15 parts of light calcium carbonate were mixed evenly in a mixer for 3 minutes at a speed of 500 r / min.

[0055] The above mixture was added into a twin-screw extruder and melt-blended at 190° C., with a screw speed of 300 r / min and a vacuum degree of -0.06 MPa. After blending, the mixture was extruded into a sheet shape and rolled up to prepare a lignin-modified thermoplastic elastomer waterproof roll material.

[0056] Comparative Example 1

[0057] 35 parts of polypropylene (ExxonMobil 7032E2), 45 parts of polyolefin elastomer (Dow Chemical ENGAGE 8150), 1 part of maleic anhydride, 0.03 parts of 3-amino-1,2,4-triazole, 0.03 parts of zinc stearate, 0.4 parts of antioxidant 1010, 0.5 parts of light stabilizer 2020, 5 parts of titanium dioxide, and 15 parts of light calcium carbonate were mixed evenly in a mixer for 3 minutes at a speed of 500 r / min.

[0058] The above mixture was added into a twin-screw extruder and melt-blended at 190° C., with a screw speed of 300 r / min and a vacuum degree of -0.06 MPa. After blending, the mixture was extruded into a sheet shape and rolled up to prepare a lignin-modified thermoplastic elastomer waterproof roll material.

[0059] Comparative Example 2

[0060] 35 parts of polypropylene (ExxonMobil 7032E2), 45 parts of polyolefin elastomer (Dow Chemical ENGAGE 8150), 0.6 parts of alkali lignin (water content less than 3%, D50 less than 10μm), 1 part of maleic anhydride, 0.4 parts of antioxidant 1010, 0.5 parts of light stabilizer 2020, 5 parts of titanium dioxide, and 15 parts of light calcium carbonate were mixed evenly in a mixer for 3 minutes at a speed of 500r / min.

[0061] The above mixture was added into a twin-screw extruder and melt-blended at 190° C., with a screw speed of 300 r / min and a vacuum degree of -0.06 MPa. After blending, the mixture was extruded into a sheet shape and rolled up to prepare a lignin-modified thermoplastic elastomer waterproof roll material.

[0062] Comparative Example 3

[0063] 35 parts of polypropylene (ExxonMobil 7032E2), 45 parts of polyolefin elastomer (Dow Chemical ENGAGE 8150), 0.6 parts of alkali lignin (water content less than 3%, D50 less than 10 μm), 1 part of maleic anhydride, 3.5 parts of 3-amino-1,2,4-triazole, 3.5 parts of zinc stearate, 0.4 parts of antioxidant 1010, 0.5 parts of light stabilizer 2020, 5 parts of titanium dioxide, and 15 parts of light calcium carbonate were mixed evenly in a mixer for 3 minutes at a speed of 500 r / min.

[0064] The above mixture was added into a twin-screw extruder and melt-blended at 190° C., with a screw speed of 300 r / min and a vacuum degree of -0.06 MPa. After blending, the mixture was extruded into a sheet shape and rolled up to prepare a lignin-modified thermoplastic elastomer waterproof roll material.

[0065] Comparative Example 4

[0066] 35 parts of polypropylene (ExxonMobil 7032E2), 45 parts of polyolefin elastomer (Dow Chemical ENGAGE 8150), 0.6 parts of alkali lignin (water content less than 3%, D50 less than 10 μm), 1 part of maleic anhydride, 0.03 parts of 2,2'-bipyridine-4,4'-dimethanol, 0.03 parts of zinc stearate, 0.4 parts of antioxidant 1010, 0.5 parts of light stabilizer 2020, 5 parts of titanium dioxide, and 15 parts of light calcium carbonate were mixed evenly in a mixer for 3 minutes at a speed of 500 r / min.

[0067] The above mixture was added into a twin-screw extruder and melt-blended at 190° C., with a screw speed of 300 r / min and a vacuum degree of -0.06 MPa. After blending, the mixture was extruded into a sheet shape and rolled up to prepare a lignin-modified thermoplastic elastomer waterproof roll material.

[0068] Comparative Example 5

[0069] 35 parts of polypropylene (ExxonMobil 7032E2), 45 parts of polyolefin elastomer (Dow Chemical ENGAGE 8150), 0.6 parts of sodium lignin sulfonate (water content less than 3%, D50 less than 10 μm), 1 part of maleic anhydride, 0.03 parts of 3-amino-1,2,4-triazole, 0.03 parts of zinc stearate, 0.4 parts of antioxidant 1010, 0.5 parts of light stabilizer 2020, 5 parts of titanium dioxide, and 15 parts of light calcium carbonate were mixed evenly in a mixer for 3 minutes at a speed of 500 r / min.

[0070] The above mixture was added into a twin-screw extruder and melt-blended at 190° C., with a screw speed of 300 r / min and a vacuum degree of -0.06 MPa. After blending, the mixture was extruded into a sheet shape and rolled up to prepare a lignin-modified thermoplastic elastomer waterproof roll material.

[0071] The waterproof membrane materials prepared in the above embodiments and comparative examples were tested with reference to "Thermoplastic Polyolefin (TPO) Waterproof Membrane" GB27789-2011 and actual application conditions. The test results are shown in Table 1.

[0072] Table 1 Test results of samples obtained from examples and comparative examples

[0073]

[0074] As can be seen from the data in Table 1, the waterproofing coiled material prepared by the present invention has excellent performance, especially the thermal oxidative aging performance. After the thermal oxidative aging test at 135°C for 60 days, it can maintain good tensile strength, elongation at break, low-temperature bendability and seam peeling strength, and the performance is significantly better than that without adding lignin, and the comprehensive performance is good. Lignin and other additives can be directly added during the processing, and the operation is simple. The present invention realizes the application of biomass material-lignin in waterproofing coiled materials, gives play to the natural characteristics of lignin, and can improve its thermal oxidative aging performance.

[0075] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A lignin-modified thermoplastic elastomer waterproofing coiled material, characterized in that: The composition comprises the following components by weight: 20 to 60 parts of polypropylene, 30 to 50 parts of elastomer, 0.1 to 20 parts of lignin, 0 to 3 parts of additive A, 0 to 3 parts of additive B and 0 to 3 parts of additive C, wherein the additives A, B and C are not zero.

2. The lignin-modified thermoplastic elastomer waterproofing membrane according to claim 1, characterized in that: The composition comprises the following components by weight: 35-50 parts of polypropylene, 30-45 parts of elastomer, 0.6-10 parts of lignin, 1-3 parts of additive A, 0.03-0.5 parts of additive B and 0.03-0.5 parts of additive C; Alternatively, the composition may be prepared from the following components by weight: 35-50 parts of polypropylene, 30-45 parts of elastomer, 0.6-6 parts of lignin, 1-3 parts of additive A, 0.03-0.3 parts of additive B and 0.03-0.3 parts of additive C.

3. A lignin-modified thermoplastic elastomer waterproofing membrane according to claim 1 or 2, characterized in that: The additive A is maleic anhydride; The additive B is at least one of 1,2,4-triazole, imidazole, 3,5-diamino-1,2,4-triazole and 3-amino-1,2,4-triazole; The additive C is at least one of zinc chloride, ferric chloride, zinc acetate and zinc stearate.

4. A lignin-modified thermoplastic elastomer waterproofing membrane according to claim 1 or 2, characterized in that: The polypropylene has a molecular weight range of 80,000 to 150,000 g / mol, is stable to water, has a water absorption rate of no more than 0.01% in water for 14 hours, and a melt flow rate of 4.0 g / 10 min at 230° C. / 2.16 kg; The elastomer is at least one of ethylene-octene copolymer and styrene-butadiene-styrene; The lignin is at least one of alkali lignin and enzymatic lignin. The lignin is solid powder with a moisture content of less than 3% and a particle size range of D50 less than 10 μm.

5. The lignin-modified thermoplastic elastomer waterproofing membrane according to claim 3, characterized in that: The additive B is 3-amino-1,2,4-triazole; The additive C is zinc stearate.

6. The lignin-modified thermoplastic elastomer waterproofing membrane according to claim 4, characterized in that: The polypropylene is at least one of ExxonMobil 7032E2, 7032E3 and 7032KN; The elastomer is at least one of Dow Chemical's ENGAGE 8150, 8157, 8180, 6102 and KRATON D1101.

7. A lignin-modified thermoplastic elastomer waterproofing membrane according to claim 1 or 2, characterized in that: Calculated by weight, it includes 0-1 parts of antioxidant; 0-1 parts of light stabilizer; 0-10 parts of titanium dioxide; 10-30 parts of filler; The light stabilizer is a hindered amine light stabilizer; The filler is an inorganic filler.

8. The lignin-modified thermoplastic elastomer waterproofing membrane according to claim 7, characterized in that: Calculated by weight, it includes 0.4 to 1 parts of antioxidant; 0.5 to 1 parts of light stabilizer; 5 to 10 parts of titanium dioxide; 10 to 15 parts of filler; The antioxidant is antioxidant 1010; The light stabilizer is BASF 2020 light stabilizer; The filler is light calcium carbonate.

9. The method for preparing a lignin-modified thermoplastic elastomer waterproofing membrane according to any one of claims 1 to 8, characterized in that: The following steps are involved: (1) Mix all the raw materials in a mixer; (2) The materials uniformly mixed in step (1) are melt-blended, extruded, and sheeted through a twin-screw extruder to obtain a lignin-modified thermoplastic elastomer waterproof membrane.

10. Use of the lignin-modified thermoplastic elastomer waterproof roll material according to claim 9 in the field of waterproofing.

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