Modified bamboo fiber and method for preparing the same, composition for plant pitch-based modified pitch, plant pitch-based modified pitch and method for preparing the same, plant pitch-based waterproofing membrane

Abstract

The application relates to the technical field of building waterproof materials, and discloses a modified bamboo fiber and a preparation method thereof, a composition for plant pitch-based modified pitch, a plant pitch-based modified pitch and a preparation method thereof, and a plant pitch-based waterproof coiled material. The preparation method of the modified bamboo fiber comprises the following steps: (1) first contact of raw material bamboo fiber and compounded heat-conducting oil to obtain an intermediate I; the compounded heat-conducting oil is a combination of heat-conducting oil and petroleum pitch I with a content weight ratio of 1:0.04-0.06; (2) second contact of the intermediate I and a modified solution to obtain the modified bamboo fiber; the modified solution contains a modifier with a concentration of 30-50 wt%; the modifier is a combination of sodium lignosulfonate and maleic anhydride. The plant pitch-based waterproof coiled material prepared by the application has excellent mechanical properties and weather resistance.

Description

Technical Field

[0001] This invention relates to the field of building waterproofing materials technology, specifically to a modified bamboo fiber and its preparation method, a composition for plant-based modified bitumen, a plant-based modified bitumen and its preparation method, and a plant-based waterproof membrane. Background Technology

[0002] Currently, the asphalt membranes commonly used in the building waterproofing field are mainly based on petroleum-based asphalt, and the performance of waterproof membranes is improved by adding modifiers such as styrene-butadiene-styrene block copolymer (SBS) and atactic polypropylene (APP).

[0003] Typical traditional methods for preparing waterproof membranes include two types: traditional SBS modified bitumen membranes and single-plant bitumen modified membranes. The traditional SBS modified bitumen membrane preparation process involves using 70# petroleum bitumen as the base, adding 10-15 wt% SBS elastomer, supplemented with fillers and additives, and then mixing at high temperatures and coating it onto the base. This process mainly relies on petroleum-based raw materials, resulting in waterproof membranes that are prone to softening at high temperatures and cracking at low temperatures, failing to meet the long-term use requirements of extremely cold and hot regions. Furthermore, this production process emits bitumen fumes (containing pollutants such as benzo[a]pyrene), and there is the problem of difficult degradation of waste membranes, all of which contribute to serious "black pollution." Single-plant bitumen modified membranes partially replace petroleum bitumen with plant bitumen, with a replacement rate of 30-50 wt%. The sterols and vitamin E in plant bitumen can effectively improve the flexibility and weather resistance of the membrane. However, this process suffers from poor compatibility between plant bitumen and petroleum bitumen, insufficient mechanical properties of the membrane (tensile strength <10 MPa), and decreased high-temperature adhesion.

[0004] In addition, the traditional method of preparing roll materials uses a high-temperature mixing process, which is energy-intensive and can easily accelerate asphalt aging. At the same time, it has poor dispersibility with engineering plastics such as thermoplastic polyester elastomer (TPEE) and polyoxymethylene (POM), making it difficult to achieve synergistic modification effects.

[0005] CN113564940A discloses a self-adhesive polymer-modified bitumen polyester-based waterproof membrane. The membrane structure includes a modified polyester base layer and self-adhesive layers covering both sides of the modified polyester base layer. The modified polyester base layer comprises polyester chips, nano-silica, modified graphene oxide powder, and a dispersant in a weight ratio of 100:(4-6):(2-4):(15-20). The modified graphene oxide powder is obtained by first oxidizing graphene powder and then reacting it with p-phenylenediamine and toluene diisocyanate. This invention adds modified bamboo fiber obtained by modifying with ferric chloride during the preparation of the self-adhesive layer, enhancing its tensile and tear resistance. However, the dispersibility of the modified bamboo fiber and its compatibility with the bitumen base material are poor, and the high-temperature anti-flow and low-temperature crack resistance of the prepared waterproof membrane need to be improved.

[0006] In summary, providing a novel plant-based bitumen-based waterproof membrane is of great significance. Summary of the Invention

[0007] The purpose of this invention is to provide an environmentally friendly plant-based bitumen-based waterproof membrane with excellent mechanical properties and weather resistance.

[0008] To achieve the above objectives, the present invention provides a method for preparing modified bamboo fiber, the method comprising:

[0009] (1) The raw material bamboo fiber is brought into first contact with the compound heat transfer oil to obtain intermediate I; the compound heat transfer oil is a combination of heat transfer oil and petroleum asphalt I with a content weight ratio of 1:0.04-0.06.

[0010] (2) Intermediate I is brought into a second contact with the modification solution to obtain the modified bamboo fiber; the modification solution contains a modifier with a concentration of 30-50 wt%; the modifier is a combination of sodium lignosulfonate and maleic anhydride.

[0011] A second aspect of the present invention provides modified bamboo fiber prepared by the method described in the first aspect above.

[0012] A third aspect of the present invention provides a composition for modifying asphalt with plant-based asphalt, the composition comprising a main agent and an auxiliary agent, wherein the main agent is asphalt base material, compound resin, and modified bamboo fiber;

[0013] Based on the total weight of the composition, the content of the asphalt base is 40-60 wt%, the content of the compounded resin is 10-20 wt%, and the content of the modified bamboo fiber is 5-15 wt%.

[0014] The asphalt base material is a combination of plant asphalt and petroleum asphalt II with a weight ratio of 1:0.8-1.2; the plant asphalt has a penetration of 150-350 mm at 25°C and a low-temperature flexibility of no more than -3°C.

[0015] The compound resin is a combination of terpene phenolic resin and polyurethane resin in a weight ratio of 1:0.8-1.2;

[0016] The modified bamboo fiber is the modified bamboo fiber described in the second aspect above.

[0017] The fourth aspect of the present invention provides a method for preparing plant-based modified asphalt, the method using the components of the composition described in the third aspect above, the method comprising: stirring and mixing the components of the composition to obtain the plant-based modified asphalt;

[0018] Preferably, the mixing conditions include: a temperature of 120-140℃, a rotation speed of 500-2000 rpm, and a time of 1-5 hours.

[0019] The fifth aspect of the present invention provides a plant-based modified bitumen prepared by the method described in the fourth aspect above.

[0020] The sixth aspect of the present invention provides a plant-based bituminous waterproof membrane, the plant-based bituminous waterproof membrane comprising a base fabric and a bituminous layer, wherein the bituminous layer is the plant-based bituminous modified bituminous material described in the fifth aspect above;

[0021] Preferably, the base fabric is a polyester base and / or a polypropylene nonwoven fabric.

[0022] Through the above technical solution, the present invention has at least the following beneficial technical effects:

[0023] (1) The present invention uses modified bamboo fiber that has undergone specific modification treatment, which works synergistically with the plant asphalt / petroleum asphalt composite system, so that the prepared plant asphalt-based waterproof membrane has excellent mechanical properties and weather resistance while ensuring excellent waterproof performance.

[0024] (3) The present invention uses low-temperature mixing and coating technology in the preparation of plant bitumen-based waterproof membrane. Compared with the traditional process of preparing waterproof membrane, the preparation conditions are milder, which can effectively reduce carbon emissions and is more in line with the production concept of environmental protection and energy conservation. Detailed Implementation

[0025] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0026] As previously described, a first aspect of the present invention provides a method for preparing modified bamboo fiber, the method comprising:

[0027] (1) The raw material bamboo fiber is brought into first contact with the compound heat transfer oil to obtain intermediate I; the compound heat transfer oil is a combination of heat transfer oil and petroleum asphalt I with a content weight ratio of 1:0.04-0.06.

[0028] (2) Intermediate I is brought into a second contact with the modification solution to obtain the modified bamboo fiber; the modification solution contains a modifier with a concentration of 30-50 wt%; the modifier is a combination of sodium lignosulfonate and maleic anhydride.

[0029] Preferably, in step (2), the modifier is a combination of sodium lignosulfonate and maleic anhydride in a weight ratio of 1:0.2-0.4. The inventors of this invention have discovered that, under this preferred condition, the prepared plant-based bitumen waterproof membrane exhibits superior weather resistance.

[0030] Preferably, in step (1), the conditions for the first contact include: a temperature of 160-200°C and a time of 2-8 minutes.

[0031] Preferably, the heat transfer oil is selected from at least one of mineral-based heat transfer oil, biphenyl-biphenyl ether mixed heat transfer oil, and methyl silicone oil, and the petroleum asphalt I is 70# asphalt and / or 90# asphalt.

[0032] According to a preferred embodiment, in step (1), the raw material bamboo fiber is prepared by mechanical method from green bamboo, hemp bamboo or moso bamboo, and the length of the raw material bamboo fiber is 0.3-1mm.

[0033] More preferably, in step (2), the conditions for the second contact include: a temperature of 80-100°C and a time of 2-4 hours.

[0034] Preferably, in step (2), the solvent of the modified solution is deionized water.

[0035] The present invention does not have any special requirements on the volume of the modified solution, as long as it can completely soak the intermediate I.

[0036] Preferably, step (2) further includes drying the pre-product obtained after the second contact to obtain the modified bamboo fiber; the drying conditions include: temperature of 100-110℃ and time of 1-4h.

[0037] As previously stated, a second aspect of the present invention provides modified bamboo fiber prepared by the method described in the first aspect.

[0038] As mentioned above, a third aspect of the present invention provides a composition for plant-based modified bitumen, the composition comprising a main agent and an additive, wherein the main agent is bitumen base material, compound resin, and modified bamboo fiber;

[0039] Based on the total weight of the composition, the content of the asphalt base is 40-60 wt%, the content of the compounded resin is 10-20 wt%, and the content of the modified bamboo fiber is 5-15 wt%.

[0040] The asphalt base material is a combination of plant asphalt and petroleum asphalt II with a weight ratio of 1:0.8-1.2; the plant asphalt has a penetration of 150-350 mm at 25°C and a low-temperature flexibility of no more than -3°C.

[0041] The compound resin is a combination of terpene phenolic resin and polyurethane resin in a weight ratio of 1:0.8-1.2;

[0042] The modified bamboo fiber is the modified bamboo fiber described in the second aspect above.

[0043] In this invention, the penetration of the plant-based asphalt is determined according to GB / T 4509-2010, and the low-temperature flexibility is determined according to GB / T328.14-2007.

[0044] Preferably, the petroleum asphalt II is selected from 70# asphalt and / or 90# asphalt.

[0045] Preferably, the additives include thermoplastic polyester elastomer and polyoxymethylene; based on the total weight of the composition, the content of the thermoplastic polyester elastomer is 8-12 wt%, and the content of the polyoxymethylene is 5-10 wt%.

[0046] More preferably, the melt index of the thermoplastic polyester elastomer is from 8 g / 10 min to 15 g / 10 min.

[0047] More preferably, the additives may further include hindered phenolic antioxidants, plasticizers, UV stabilizers, and nano-calcium carbonate.

[0048] Preferably, based on the total weight of the composition, the content of the hindered phenolic antioxidant is 0.5-1 wt%, the content of the plasticizer is 3-5 wt%, the content of the UV stabilizer is 1-2 wt%, and the content of the nano-calcium carbonate is 2-4 wt%.

[0049] More preferably, the plasticizer is selected from at least one of dioctyl phthalate (DOP), dioctyl terephthalate (DOTP), and diisononyl phthalate (DINP), the UV stabilizer is selected from benzotriazole light stabilizers and / or cinnamic acid UV absorbers, and the average particle diameter of the nano-calcium carbonate is 80-100 nm.

[0050] As previously stated, a fourth aspect of the present invention provides a method for preparing plant-based modified asphalt, the method being carried out using the components of the composition described in the third aspect above, the method comprising: stirring and mixing the components of the composition to obtain the plant-based modified asphalt;

[0051] Preferably, the mixing conditions include: a temperature of 120-140℃, a rotation speed of 500-2000 rpm, and a time of 1-5 hours.

[0052] According to a preferred embodiment, the method for preparing the plant-based modified asphalt includes the following steps:

[0053] S1. Add plant asphalt and petroleum asphalt II into the reactor, raise the temperature to 120-130℃, and stir and mix at a speed of 500-1000 rpm for 15-20 minutes to obtain asphalt base material;

[0054] S2. Keeping the temperature and rotation speed constant, the compound resin, modified bamboo fiber, thermoplastic polyester elastomer and polyoxymethylene are sequentially mixed with the asphalt base material for 15-20 minutes to obtain mixture I.

[0055] S3. At 135-145℃, antioxidant, plasticizer, UV stabilizer and nano-calcium carbonate are mixed with the mixture I and stirred at a stirring rate of 1500-2000 rpm for 30-60 minutes to obtain the plant-based modified asphalt.

[0056] As previously stated, the fifth aspect of the present invention provides a plant-based modified bitumen prepared by the method described in the fourth aspect above.

[0057] As previously stated, a sixth aspect of the present invention provides a plant-based bituminous waterproof membrane, the plant-based bituminous waterproof membrane comprising a base fabric and a bituminous layer, wherein the bituminous layer is the plant-based bituminous modified bituminous material described in the fifth aspect above.

[0058] Preferably, the base fabric is a polyester base and / or a polypropylene nonwoven fabric.

[0059] Preferably, the plant-based bitumen-based waterproof membrane further includes an isolation layer, which may be a PE silicone film, a PE silicone-free film, or a sand isolation layer.

[0060] More preferably, the base fabric is a polyester base with a basis weight of 200-280 g / m². 2 .

[0061] According to a preferred embodiment, the plant-based bituminous waterproof membrane is prepared using a warm-mix technique, the specific steps of which include:

[0062] 1) Using warm-mix technology, at 110-130℃, the plant-based modified asphalt is coated onto the upper and lower surfaces of a pre-impregnated polyester base to obtain intermediate material I; wherein the coating amount of the plant-based modified asphalt is 3000-4000 g / m³. 2 The coating thickness is controlled to be 3-4mm by a thickness roller.

[0063] 2) Cover the upper and lower surfaces of the intermediate material I with an isolation layer, compact it with a calendering roller, and cure it for 5-10 minutes with a cooling device (temperature 20-30℃) to obtain the plant bitumen-based waterproof membrane.

[0064] The present invention will be described in detail below through examples. In the following examples, unless otherwise specified, all instruments and reagents used are commercially available products.

[0065] The following examples include some of the raw materials used and their sources:

[0066] Raw material bamboo fiber: fiber length 0.4mm, purchased from Shanggao County Polysilicon Mining Co., Ltd.;

[0067] Petroleum Asphalt I: 70# asphalt, purchased from Maoming Branch of China Petroleum & Chemical Corporation;

[0068] Petroleum Asphalt II: 90# asphalt, purchased from Maoming Branch of China Petroleum & Chemical Corporation;

[0069] Thermal oil: Methyl silicone oil, purchased from Shanghai Kaiping Resin Co., Ltd.

[0070] Sodium lignosulfonate: purchased from Shandong Jinrong Chemical Technology Co., Ltd.;

[0071] Maleic anhydride: purchased from Shandong Feihong New Materials Co., Ltd.;

[0072] Plant-based bitumen: penetration at 25℃ is 326 0.1mm, low-temperature flexibility is -7℃, purchased from Boxing County Deyi Trading Co., Ltd.

[0073] Terpene phenolic resin: softening point 150℃, grade 803L, purchased from Guangdong Boruida Polymer Technology Co., Ltd.

[0074] Polyurethane resin: purity 99%, grade 9009-54-5, purchased from Hubei Shixing Chemical Co., Ltd.;

[0075] Thermoplastic polyester elastomer (TPEE): melt index of 10g / 10min, grade DuPont G3548, purchased from Dongguan Xinshengli Plastic New Material Technology Co., Ltd.

[0076] Polyoxymethylene (POM): Purchased from Shandong Hairui New Materials Co., Ltd.

[0077] Hindered phenolic antioxidants: Trifunctional hindered phenolic antioxidants, brand name MIANOX3114, purchased from Nanjing Milan Chemical Co., Ltd.

[0078] Plasticizer-I: Dioctyl phthalate, purchased from Jinan Anqi Chemical Co., Ltd.;

[0079] Plasticizer-II: Dioctyl terephthalate, purchased from Shandong Aite Chemical Co., Ltd.;

[0080] UV stabilizer-I: Benzotriazole light stabilizer, brand name UV-326, purchased from Nanjing Milan Chemical Co., Ltd.;

[0081] UV absorber-II: Cinnamic acid-based UV absorber, brand name UV-3039, purchased from Dongguan Xingyuan Chemical Co., Ltd.

[0082] Nano calcium carbonate: The average particle diameter is 90nm, purchased from Shengfei Mineral Products Processing Plant in Lingshou County.

[0083] Preparation Example 1

[0084] This preparation example illustrates the preparation of the modified bamboo fiber provided by the present invention, including the following steps:

[0085] (1) Take heat transfer oil and petroleum asphalt I with a weight ratio of 1:0.05 and mix them to obtain compound heat transfer oil;

[0086] (2) Soak 100g of raw bamboo fiber in compound heat transfer oil heated to 180℃ for the first contact. After soaking for 5 minutes, take it out to obtain intermediate I.

[0087] (3) The above intermediate I was immersed in a 40wt% modified solution with a weight ratio of sodium lignosulfonate:maleic anhydride = 1:0.3 for a second contact. The conditions for the second contact were: temperature 90℃ and time 3h. The product obtained after the second contact was dried at 105℃ for 2h to obtain modified bamboo fiber-I.

[0088] Preparation Example 2

[0089] (1) Take heat transfer oil and petroleum asphalt I with a weight ratio of 1:0.06 and mix them to obtain compound heat transfer oil;

[0090] (2) Soak 100g of raw bamboo fiber in compound heat transfer oil heated to 200℃ for the first contact. After soaking for 3 minutes, take it out to obtain intermediate I.

[0091] (3) The above intermediate I was immersed in a 50wt% modified solution with a weight ratio of sodium lignosulfonate:maleic anhydride = 1:0.2 for a second contact. The conditions for the second contact were: temperature 100℃ and time 2h. The product obtained after the second contact was dried at 105℃ for 2h to obtain modified bamboo fiber-II.

[0092] Preparation Example 3

[0093] (1) Take heat transfer oil and petroleum asphalt I with a weight ratio of 1:0.05 and mix them to obtain compound heat transfer oil;

[0094] (2) Soak 100g of raw bamboo fiber in compound heat transfer oil heated to 180℃ for the first contact. After soaking for 5 minutes, take it out to obtain intermediate I.

[0095] (3) The above intermediate I was immersed in a 40wt% modified solution with a weight ratio of sodium lignosulfonate:maleic anhydride = 1:0.5 for a second contact. The conditions for the second contact were: temperature 90℃ and time 3h. The product obtained after the second contact was dried at 105℃ for 2h to obtain modified bamboo fiber-III.

[0096] Comparative Preparation Example 1

[0097] This comparative preparation example was prepared using a method similar to that of Preparation Example 1. The difference was that in step (3), the modified solution in Preparation Example 1 was replaced with an aqueous solution of sodium lignosulfonate with a concentration of 40 wt%. The remaining operations were the same as in Preparation Example 1, and modified bamboo fiber-DI was obtained.

[0098] Comparative Preparation Example 2

[0099] This comparative preparation example was prepared using a method similar to that of Preparation Example 1. The difference was that in step (3), the modified solution in Preparation Example 1 was replaced with a 40wt% maleic anhydride aqueous solution. The remaining operations were the same as in Preparation Example 1, and modified bamboo fiber-DII was obtained.

[0100] Comparative preparation example 3

[0101] This comparative preparation example uses a method similar to that of Preparation Example 1. The difference is that steps (1) and (2) of Preparation Example 1 are not performed on the raw bamboo fiber. Instead, the raw bamboo fiber is directly modified, specifically as follows:

[0102] 100g of raw bamboo fiber was immersed in a 40wt% modified solution with a weight ratio of sodium lignosulfonate to maleic anhydride of 1:0.3 for contact. The contact conditions were: temperature 90℃ and time 3h. After the contact was completed, the product was dried at 105℃ for 2h to obtain modified bamboo fiber-DIII.

[0103] The embodiments of the present invention illustrate the preparation of plant-based modified bitumen. Unless otherwise specified, the amounts of raw materials used in the following examples are parts by weight, and each part by weight represents 10g.

[0104] Example 1

[0105] S1. Add plant asphalt and petroleum asphalt to a reaction vessel, raise the temperature to 130°C, and stir and mix at 500 rpm for 15 minutes to obtain asphalt base material.

[0106] S2. Keeping the conditions of 130℃ and 500rpm unchanged, the compound resin, modified bamboo fiber, thermoplastic polyester elastomer and polyoxymethylene are sequentially mixed with the asphalt base material for 15 minutes to obtain mixture I.

[0107] S3. At 140°C, the hindered phenolic antioxidant, plasticizer, UV stabilizer and nano-calcium carbonate are mixed with the mixture I and stirred at a stirring rate of 1500 rpm for 30 min to obtain the plant-based modified asphalt.

[0108] The specific types of substances, dosages, and process parameters in this embodiment are shown in Table 1.

[0109] Unless otherwise specified, Examples 2 and 3 are carried out with reference to the method of Example 1. The difference is that the types of substances used, the amounts used, and the process parameters are not exactly the same in the examples. See Table 1 for details.

[0110] Table 1

[0111]

[0112] Example 4

[0113] This embodiment is carried out with reference to the method of Embodiment 1. The difference is that in this embodiment, modified bamboo fiber-III is used in equal parts by weight to replace modified bamboo fiber-I in Embodiment 1 to obtain plant asphalt-based modified asphalt-IV.

[0114] Example 5

[0115] This embodiment is carried out with reference to the method of Embodiment 1. The difference is that the compounded resin is replaced with terpene phenolic resin in equal mass, and the rest is the same as in Embodiment 1, to obtain plant asphalt-based modified asphalt-V.

[0116] Example 6

[0117] This embodiment is carried out with reference to the method of Embodiment 1. The difference is that the compounded resin is replaced with polyurethane resin in equal mass, and the rest is the same as in Embodiment 1, to obtain plant asphalt-based modified asphalt-VI.

[0118] Comparative Example 1

[0119] This comparative example was conducted using the same method as in Example 1. The difference is that in this comparative example, an equal weight portion of modified bamboo fiber-DI was used to replace the modified bamboo fiber-I in Example 1 to obtain plant-based modified bitumen-DI.

[0120] Comparative Example 2

[0121] This comparative example was conducted using the same method as in Example 1. The difference is that this comparative example used an equal weight portion of modified bamboo fiber-DII to replace the modified bamboo fiber-I in Example 1, resulting in plant-based modified bitumen-DII.

[0122] Comparative Example 3

[0123] This comparative example was conducted according to the method of Example 1, except that an equal weight portion of modified bamboo fiber-DIII was used to replace the modified bamboo fiber-I in Example 1 to obtain plant-based modified bitumen-DIII.

[0124] Comparative Example 4

[0125] This comparative example was conducted using the same method as in Example 1. The difference is that this comparative example used equal parts by weight of raw bamboo fiber to replace the modified bamboo fiber-I in Example 1, resulting in plant-based modified bitumen-DIV.

[0126] Comparative Example 5

[0127] This comparative example was conducted according to the method of Example 1, except that no modified bamboo fiber was added. Otherwise, it was the same as Example 1, and plant-based modified asphalt-DV was obtained.

[0128] Test case

[0129] This test example is used to determine the physical and chemical properties of plant-based waterproof membranes containing the above-mentioned plant-based modified bitumen.

[0130] The following are the specific steps for preparing plant-based bitumen-based waterproof membranes using warm-mix technology:

[0131] 1) Using warm-mix technology, at 120℃, the plant-based modified asphalt is coated onto the upper and lower surfaces of a polyester base pre-impregnated with No. 10 asphalt to obtain intermediate material I; wherein the coating amount of the plant-based modified asphalt is 3500 g / m³. 2 The coating thickness is controlled to be 3-4mm by a thickness roller.

[0132] 2) Cover the upper surface of the intermediate material I with a PE silicone-free film and the lower surface with a PE silicone oil film, compact it with a calendering roller, and cure it for 10 minutes with a cooling device (temperature 20℃) to obtain the plant bitumen-based waterproof membrane.

[0133] The tensile strength, peel strength between the membrane and cement mortar, ultimate low-temperature flexibility and ultimate heat resistance of the above-mentioned plant bitumen-based waterproof membrane were tested in accordance with GB / T 35467-2017 standard.

[0134] The aging resistance performance was determined by measuring the retention rate of the adhesive strength of the roll material after 100 hours of UV aging.

[0135] The test results are shown in Table 2.

[0136] Table 2

[0137]

[0138] As can be seen from the results in Table 2, the plant-based bitumen waterproof membrane provided by the present invention has excellent bonding strength, mechanical properties and weather resistance.

[0139] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A method for preparing modified bamboo fiber, characterized in that, The method includes: (1) The raw material bamboo fiber is brought into first contact with the compound heat transfer oil to obtain intermediate I; the compound heat transfer oil is a combination of heat transfer oil and petroleum asphalt I with a content weight ratio of 1:0.04-0.06; the heat transfer oil is methyl silicone oil, and the petroleum asphalt I is 70# asphalt and / or 90# asphalt. (2) Intermediate I is brought into a second contact with the modification solution to obtain the modified bamboo fiber; the modification solution contains a modifier with a concentration of 30-50 wt%; the modifier is a combination of sodium lignosulfonate and maleic anhydride.

2. The method according to claim 1, wherein, In step (2), the modifier is a combination of sodium lignosulfonate and maleic anhydride in a weight ratio of 1:0.2-0.

4.

3. The method according to claim 1, wherein, In step (1), the conditions for the first contact include: a temperature of 160-200℃ and a time of 2-8 min; And / or, in step (2), the conditions for the second contact include: a temperature of 80-100°C and a time of 2-4 hours.

4. Modified bamboo fiber prepared by the method according to any one of claims 1-3.

5. A composition for modifying asphalt with plant-based bitumen, characterized in that, The composition consists of a main agent and an auxiliary agent, wherein the main agent is asphalt base material, compound resin, and modified bamboo fiber; Based on the total weight of the composition, the content of the asphalt base is 40-60 wt%, the content of the compounded resin is 10-20 wt%, and the content of the modified bamboo fiber is 5-15 wt%. The asphalt base material is a combination of plant asphalt and petroleum asphalt II with a weight ratio of 1:0.8-1.2; the plant asphalt has a penetration of 150-350 mm at 25°C and a low-temperature flexibility of no more than -3°C. The compound resin is a combination of terpene phenolic resin and polyurethane resin in a weight ratio of 1:0.8-1.2; The petroleum bitum II is selected from 70# bitumen and / or 90# bitumen; The modified bamboo fiber is the modified bamboo fiber as described in claim 4.

6. The composition according to claim 5, wherein, The additives include thermoplastic polyester elastomers and polyoxymethylene; Based on the total weight of the composition, the content of the thermoplastic polyester elastomer is 8-12 wt%, and the content of the polyoxymethylene is 5-10 wt%.

7. The composition according to claim 6, wherein, The melt index of the thermoplastic polyester elastomer is from 8 g / 10 min to 15 g / 10 min.

8. A method for preparing plant-based modified bitumen, characterized in that, The method is carried out using each component of the composition according to any one of claims 5-7, and the method includes: stirring and mixing each component of the composition to obtain the plant-based modified asphalt; And / or, the mixing conditions include: a temperature of 120-140℃, a rotation speed of 500-2000 rpm, and a time of 1-5 h.

9. The plant-based modified bitumen prepared by the method of claim 8.

10. A plant-based bitumen-based waterproof membrane, characterized in that, The plant-based bitumen-based waterproof membrane comprises a base fabric and a bitumen layer, wherein the bitumen layer is the plant-based bitumen-modified bitumen as described in claim 9; And / or, the base fabric is a polyester base and / or a polypropylene nonwoven fabric.

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