阅读说明：本技术 一种高强度抗老化防淤堵加筋复合土工布的制备方法 (Preparation method of high-strength anti-aging anti-clogging reinforced composite geotextile ) 是由 程晓林 于 2021-01-20 设计创作，主要内容包括：本发明公开了一种高强度抗老化防淤堵加筋复合土工布的制备方法,通过以聚丙烯合成纤维和玻璃纤维混料针刺无纺织物以及聚酯机织布为基材,通过浸轧法将改性聚偏氟乙烯乳液均匀涂覆在无纺织物上形成微米量级的微孔膜,有效截取细小的砂石废渣颗粒物,防止其外泄,同时提高复合土工布的滤水通量,防止其淤堵,其中聚偏氟乙烯乳液合成过程中加入氧化石墨烯,氧化石墨烯对乳液的亲水改性显著,滤水通量也大大提升,并且大量的含氧基团也降低乳液成膜的膜阻力,污染物质不易在其表面及膜孔内沉积,有利于膜抗污染性能的提高以及维持稳定的渗透率,降低淤堵的情况发生,同时添加紫外线屏蔽剂纳米TiO-2,赋予了复合土工布优异的抗老化功能。(The invention discloses a preparation method of a high-strength anti-aging anti-clogging reinforced composite geotextile, which comprises the steps of taking a polypropylene synthetic fiber and glass fiber mixed needle-punched non-woven fabric and a polyester woven fabric as base materials, uniformly coating a modified polyvinylidene fluoride emulsion on the non-woven fabric by a padding method to form a micron-scale microporous membrane, effectively intercepting fine sand and stone waste residue particles, preventing the fine sand and stone waste residue particles from leaking, simultaneously improving the water filtration flux of the composite geotextile and preventing clogging of the composite geotextile, wherein graphene oxide is added in the synthetic process of the polyvinylidene fluoride emulsion, the hydrophilic modification of the emulsion by the graphene oxide is obvious, the water filtration flux is greatly improved, a large number of oxygen-containing groups also reduce the membrane resistance of the emulsion film, pollutants are not easy to deposit on the surface and in membrane pores, the improvement of the anti-pollution performance of the membrane and the maintenance of stable permeability are facilitated, simultaneously adding ultraviolet screening agent nano TiO 2 And the composite geotextile is endowed with an excellent anti-aging function.)

1. The preparation method of the high-strength anti-aging anti-clogging reinforced composite geotextile is characterized by comprising the following steps of:

step A1, uniformly mixing polypropylene, glass fiber and modified calcium sulfate whisker, feeding the mixture into a screw extruder, melting and extruding the mixture, transferring the mixture into a spinning box, spraying the mixture from spinneret orifices of the spinning box, cooling the mixture by a side fan, carrying out air flow drafting on cooled tows by a tubular drafting machine to achieve uniform filament separation, uniformly laying the filaments on a coagulation screen curtain under the control of side blowing air flow, outputting the filaments to a needle machine by a pre-pressing roller, and pre-needling and main needling the formed filament fiber web to obtain the high-strength polypropylene non-woven fabric;

step A2, ultrasonically cleaning the high-strength polypropylene non-woven fabric prepared in the step A1 for 10-20 minutes by using deionized water, and adopting a padding method and TiO₂And (3) after-finishing the cleaned high-strength polypropylene non-woven fabric by using the/GO/polyvinylidene fluoride composite emulsion, putting the non-woven fabric into an oven after the after-finishing is finished, drying the non-woven fabric for 30-40 minutes at 80-100 ℃, taking out the non-woven fabric, cleaning the non-woven fabric for 2-3 times by using deionized water, and naturally drying the non-woven fabric to obtain the high-strength anti-aging non-woven fabric.

Step A3, weaving polyester fiber through a weaving machine to prepare woven grey cloth;

and step A4, placing the high-strength anti-aging non-woven fabric prepared in the step A2 on the lower layer and the upper layer, placing woven grey cloth on the middle layer, and performing hot pressing and attaching, wherein the hot pressing pressure is controlled to be 80-200Kgf, the hot pressing temperature is controlled to be 100-.

2. The method for preparing the high-strength anti-aging anti-clogging reinforced composite geotextile according to claim 1, wherein the method comprises the following steps: the polypropylene, the glass fiber and the modified calcium sulfate whisker in the step A1 are prepared from the following components in parts by weight: 20-30 parts of polypropylene, 10-15 parts of glass fiber and 4-6 parts of modified calcium sulfate whisker, wherein the heating temperature of each section of the screw extruder is 160 ℃, 180 ℃, 200 ℃ and 210 ℃, and the rotating speed of the screw is 70-90 rpm; the padding process of the step A2 is that the bath ratio is 1:25, the soaking temperature is 25 ℃, the soaking time is 3 minutes, and the roller pressure is 0.2 MPa; the weight portion of the polyester fiber in the step A3 is 20-25.

3. The method for preparing the high-strength anti-aging anti-clogging reinforced composite geotextile according to claim 1, wherein the method comprises the following steps: the modified calcium sulfate whisker is prepared by the following steps:

adding titanate coupling agent into a three-neck flask, adding acetone for dilution, adding calcium sulfate whisker into the flask, heating to 70 ℃, condensing, refluxing, magnetically stirring for 5-7 hours, after the reaction is finished, carrying out suction filtration on the product, washing the filter cake after the suction filtration with ethanol solution twice, placing the product into a vacuum drying oven, and drying at 50-60 ℃ for 12-16 hours to obtain the modified calcium sulfate whisker.

4. The method for preparing the high-strength anti-aging anti-clogging reinforced composite geotextile according to claim 1, wherein the method comprises the following steps: TiO according to step A2₂The/graphene oxide/polyvinylidene fluoride composite emulsion is prepared by the following steps:

step S1, placing the modified polyvinylidene fluoride and the graphene oxide in a vacuum oven at 70 ℃ for drying for 12-15 hours for later use;

step S2, dispersing the graphene oxide prepared in the step S1 in N, N-dimethylformamide solution, and carrying out ultrasonic treatment for 8-10 hours to prepare graphene oxide dispersion liquid;

step S3, mixing the nano TiO₂Dispersing in N, N-dimethyl formamide solution, ultrasonic treating for 4-6 hr to obtain nanometer TiO₂A dispersion liquid;

step S4, stirring and dissolving the modified polyvinylidene fluoride prepared in the step S1 and polyvinylpyrrolidone in an N, N-dimethylformamide solution, controlling the reaction temperature to 65 ℃, reacting for 3 hours to prepare a polyvinylidene fluoride emulsion, and adding the graphene oxide dispersion liquid prepared in the step S2 and the nano TiO prepared in the step S3 into the polyvinylidene fluoride emulsion₂Dispersing the solution, and carrying out ultrasonic treatment for 0.5 to 1 hour to prepare TiO₂Graphene oxide/polyvinylidene fluoride composite emulsion.

5. The method for preparing the high-strength anti-aging anti-clogging reinforced composite geotextile according to claim 3, wherein the method comprises the following steps: the dosage ratio of the titanate coupling agent, the acetone and the calcium sulfate whisker is 4-6 g: 20-30 mL: 10-15g, the stirring speed is 200-220rpm, the dosage of the ethanol solution is 20-30mL, and the mass fraction of the ethanol solution is 40%.

6. The method for preparing the high-strength anti-aging anti-clogging reinforced composite geotextile according to claim 4, wherein the method comprises the following steps: the dosage ratio of the graphene oxide and the N, N-dimethylformamide solution in the step S2 is 4mg:30-50mL, and the N, N-dimethylformamide solutionThe volume fraction of the solution is 70 percent, and the nano TiO is obtained in the step S3₂And the dosage ratio of the N, N-dimethylformamide solution is 0.30-0.45 g: 25-35mL of N, N-dimethylformamide solution with the volume fraction of 40-50%, and the modified polyvinylidene fluoride, polyvinylpyrrolidone, N, N-dimethylformamide solution, graphene oxide dispersion and nano TiO described in step S4₂The dosage ratio of the dispersion liquid is 3-5g:1-1.5 g: 50-70 mL: 5-8 mL: 10-12mL, and the volume fraction of the N, N-dimethylformamide solution is 20-30%.

7. The method for preparing the high-strength anti-aging anti-clogging reinforced composite geotextile according to claim 4, wherein the method comprises the following steps: step S3 of nano TiO₂The method comprises the following steps:

step C1, adding titanium tetrachloride into a high-pressure reaction kettle, adding 3, 5-dimethylpiperidine, KH-570 and deionized water, stirring and mixing for 0.5 hour, then placing the reaction kettle in an oven with the temperature set at 170 ℃ to heat for 3-4 days, and then taking out the reaction kettle to naturally cool to room temperature to obtain a product;

step C2, centrifugally separating the product for 20 minutes, dispersing the precipitate in absolute ethyl alcohol, ultrasonically oscillating for 10-20 minutes, placing the precipitate in a vacuum drying oven, and drying for 5-6 hours at the temperature of 60-70 ℃ to obtain the nano TiO₂。

8. The method for preparing the high-strength anti-aging anti-clogging reinforced composite geotextile according to claim 4, wherein the method comprises the following steps: the modified polyvinylidene fluoride of step S1 is prepared by the following steps:

step D1, putting polyvinylidene fluoride into a flask, adding N-methyl pyrrolidone, stirring and mixing, adding tetraethylammonium hydroxide solution in nitrogen atmosphere, heating for 30 minutes, raising the temperature to 110 ℃, and preserving the temperature for 10 minutes to obtain polyvinylidene fluoride solution;

and D2, sequentially adding acrylic acid and benzoyl peroxide into N-methyl pyrrolidone, stirring and mixing, adding the polyvinylidene fluoride solution prepared in the step D1 into the mixed solution, controlling the reaction temperature to be 70 ℃ for reaction for 30-40 minutes, after the reaction is finished, washing the product for 2-3 times by using deionized water, extracting by using absolute ethyl alcohol for 18-24 hours to remove unreacted acrylic acid, and after extraction, drying the product in a vacuum oven at the temperature of 70-80 ℃ for 8-12 hours to prepare the modified polyvinylidene fluoride.

9. The method for preparing the high-strength anti-aging anti-clogging reinforced composite geotextile according to claim 7, wherein the method comprises the following steps: the dosage ratio of the titanium tetrachloride, the 3, 5-dimethylpiperidine, the KH-570 and the deionized water in the step C1 is 1.2 to 1.32 mmol: 20.12-20.55 mol: 6-7 mg: 55.56-60mmol, and the dosage of the absolute ethyl alcohol in the step C2 is 20-30 mL.

10. The method for preparing the high-strength anti-aging anti-clogging reinforced composite geotextile according to claim 8, wherein the method comprises the following steps: the dosage ratio of the polyvinylidene fluoride, the N-methyl pyrrolidone and the tetraethyl ammonium hydroxide solution in the step D1 is 3-5g: 15-30 mL: 2-4mL, wherein the concentration of the tetraethylammonium hydroxide solution is 3mL of tetraethylammonium hydroxide added in every 100mL of anhydrous methanol, and the dosage of the solution of N-methylpyrrolidone, acrylic acid, benzoyl peroxide and polyvinylidene fluoride in the step D2 is 15-20 mL: 2-4 g: 9-12 mg: 8-10 mL.

Technical Field

The invention belongs to the technical field of geotextile preparation, and relates to a preparation method of a high-strength anti-aging anti-clogging reinforced composite geotextile.

Background

Geotextiles are often used as anti-filtration materials in engineering facilities such as earth dams, dykes, relief wells, tailing ponds, roadbeds, underground anti-floating structures and the like to play a role in water filtration and soil protection. Reverse filtration, also known as filtration, percolation or back-filtration, is engineered to allow liquid to pass through while keeping the soil particles under osmotic pressure from escaping. There are generally two requirements for the choice of the anti-filter material: firstly, soil conservation is required, namely particles in a protected soil body are required not to penetrate through a reverse filter layer, otherwise, a large amount of soil particles are lost and a piping phenomenon is caused; and secondly, water permeation is required, namely the water body is required to be smoothly discharged. However, the clogging problem of the geotextile in long-term use and how to prevent the clogging are a great problem.

The invention discloses a polypropylene filament, polypropylene filament needle-punched reverse filtration geotextile and a preparation method thereof, and the polypropylene filament needle-punched reverse filtration geotextile comprises two layers of fiber nets with different fineness to form two-stage reverse filtration, has large equivalent aperture, is not easy to block, can effectively play a role of reverse filtration, has strong acid and alkali resistance, is not influenced at any under the condition of pH value of 2-13, has excellent mechanical property, and has longitudinal and transverse strength of 15kN/m, thereby being suitable for a reverse filtration layer of an expressway. However, the polypropylene filament needle-punched reverse filtration geotextile has a plurality of defects of simultaneous exposure, one polypropylene filament has no elasticity and self-adaptive deformation capability, is difficult to adapt to micro deformation in engineering, is easy to generate poor phenomena such as clogging, cracking and the like after long-term use, and the application environment of the polypropylene filament needle-punched reverse filtration geotextile is limited due to poor ultraviolet aging resistance of a polypropylene material.

Disclosure of Invention

In order to overcome the technical problems, the invention provides a preparation method of a high-strength anti-aging anti-clogging reinforced composite geotextile.

The technical problems to be solved by the invention are as follows:

the polypropylene fiber has no elasticity and self-adaptive deformation capability, is difficult to adapt to micro deformation in engineering, is easy to generate poor phenomena such as silting, cracking and the like after long-term use, and has poor ultraviolet aging resistance, so that the application place of the polypropylene fiber is limited.

The purpose of the invention can be realized by the following technical scheme:

a preparation method of a high-strength anti-aging anti-clogging reinforced composite geotextile comprises the following steps:

step A1, uniformly mixing polypropylene, glass fiber and modified calcium sulfate whisker, feeding the mixture into a screw extruder, melting and extruding the mixture, transferring the mixture into a spinning box, spraying the mixture from spinneret orifices of the spinning box, cooling the mixture by a side fan, carrying out air flow drafting on cooled tows by a tubular drafting machine to achieve uniform filament separation, uniformly laying the filaments on a coagulation screen curtain under the control of side blowing air flow, outputting the filaments to a needle machine by a pre-pressing roller, and pre-needling and main needling the formed filament fiber web to obtain the high-strength polypropylene non-woven fabric;

step A2, ultrasonically cleaning the high-strength polypropylene non-woven fabric prepared in the step A1 for 10-20 minutes by using deionized water, and adopting a padding method and TiO₂After finishing the cleaned high-strength polypropylene non-woven fabric, putting the non-woven fabric into an oven after finishing, drying the non-woven fabric for 30 to 40 minutes at 80 to 100 ℃, taking out the non-woven fabric, cleaning the non-woven fabric for 2 to 3 times by using deionized water, and naturally drying the non-woven fabric to obtain the high-strength anti-aging non-woven fabric;

step A3, weaving polyester fiber through a weaving machine to prepare woven grey cloth;

and step A4, placing the high-strength anti-aging non-woven fabric prepared in the step A2 on the lower layer and the upper layer, placing woven grey cloth on the middle layer, and performing hot pressing and attaching, wherein the hot pressing pressure is controlled to be 80-200Kgf, the hot pressing temperature is controlled to be 100-.

Further, the polypropylene, the glass fiber and the modified calcium sulfate whisker in the step a1 in the step a1 are in parts by weight: 20-30 parts of polypropylene, 10-15 parts of glass fiber and 4-6 parts of modified calcium sulfate whisker, wherein the heating temperature of each section of the screw extruder is 160 ℃, 180 ℃, 200 ℃ and 210 ℃, and the rotating speed of the screw is 70-90 rpm; the padding process of the step A2 is that the bath ratio is 1:25, the soaking temperature is 25 ℃, the soaking time is 3 minutes, and the roller pressure is 0.2 MPa; the weight portion of the polyester fiber in the step A3 is 20-25.

Further, the modified calcium sulfate whisker is prepared by the following steps:

adding titanate coupling agent into a three-neck flask, adding acetone for dilution, adding calcium sulfate whisker into the flask, heating to 70 ℃, condensing, refluxing, magnetically stirring for 5-7 hours, after the reaction is finished, carrying out suction filtration on the product, washing the filter cake after the suction filtration with ethanol solution twice, placing the product into a vacuum drying oven, and drying at 50-60 ℃ for 12-16 hours to obtain the modified calcium sulfate whisker.

Further, the dosage ratio of the titanate coupling agent, the acetone and the calcium sulfate whisker is 4-6 g: 20-30 mL: 10-15g, the stirring speed is 200-220rpm, the dosage of the ethanol solution is 20-30mL, and the mass fraction of the ethanol solution is 40%.

Further, said TiO₂The/graphene oxide/polyvinylidene fluoride composite emulsion is prepared by the following steps:

step S1, placing the modified polyvinylidene fluoride and the graphene oxide in a vacuum oven at 70 ℃ for drying for 12-15 hours for later use;

step S2, dispersing the graphene oxide prepared in the step S1 in N, N-dimethylformamide solution, and carrying out ultrasonic treatment for 8-10 hours to prepare graphene oxide dispersion liquid;

step S3, mixing the nano TiO₂Dispersing in N, N-dimethyl formamide solution, ultrasonic treating for 4-6 hr to obtain nanometer TiO₂A dispersion liquid;

step S4, stirring and dissolving the modified polyvinylidene fluoride prepared in the step S1 and polyvinylpyrrolidone in an N, N-dimethylformamide solution, controlling the reaction temperature to 65 ℃, reacting for 3 hours to prepare a polyvinylidene fluoride emulsion, and adding the graphene oxide dispersion liquid prepared in the step S2 and the nano TiO prepared in the step S3 into the polyvinylidene fluoride emulsion₂Dispersing the solution, and carrying out ultrasonic treatment for 0.5 to 1 hour to prepare TiO₂Graphene oxide/polyvinylidene fluoride composite emulsion;

further, the dosage ratio of the graphene oxide and the N, N-dimethylformamide solution in the step S2 is 4mg:30-50mL, the volume fraction of the N, N-dimethylformamide solution is 70%, and the nano TiO in the step S3₂And the dosage ratio of the N, N-dimethylformamide solution is 0.30-0.45 g: 25-35mL, wherein the volume fraction of the N, N-dimethylformamide solution is 40-50%, and the dosage ratio of the modified polyvinylidene fluoride, the polyvinylpyrrolidone, the N, N-dimethylformamide solution, the graphene oxide dispersion liquid and the nano TiO2 dispersion liquid in the step S4 is 3-5g:1-1.5 g: 50-70 mL: 5-8 mL: 10-12mL, and the volume fraction of the N, N-dimethylformamide solution is 20-30%.

Further, the nano TiO₂Comprises the following stepsThe preparation method comprises the following steps:

step C1, adding titanium tetrachloride into a high-pressure reaction kettle, adding 3, 5-dimethylpiperidine, KH-570 and deionized water, stirring and mixing for 0.5 hour, then placing the reaction kettle in an oven with the temperature set at 170 ℃ to heat for 3-4 days, and then taking out the reaction kettle to naturally cool to room temperature to obtain a product;

step C2, centrifugally separating the product for 20 minutes, dispersing the precipitate in absolute ethyl alcohol, ultrasonically oscillating for 10-20 minutes, placing the precipitate in a vacuum drying oven, and drying for 5-6 hours at the temperature of 60-70 ℃ to obtain the nano TiO₂In which TiO is synthesized by solvothermal method₂The crystallinity of the nano-particles is improved, the nano-particles have stronger absorption in an ultraviolet spectral region, and the surface of the nano-particles is modified by a silane coupling agent₂The polyvinylidene fluoride has good dispersibility in polyvinylidene fluoride emulsion, and no obvious agglomeration phenomenon occurs. Testing by ultraviolet and visible spectrum, adding nanometer

Further, the amount ratio of the titanium tetrachloride, the 3, 5-dimethylpiperidine, the KH-570 and the deionized water in the step C1 is 1.2 to 1.32 mmol: 20.12-20.55 mol: 6-7 mg: 55.56-60mmol, and the dosage of the absolute ethyl alcohol in the step C2 is 20-30 mL.

Further, the modified polyvinylidene fluoride is prepared by the following steps:

step D1, putting polyvinylidene fluoride into a flask, adding N-methyl pyrrolidone, stirring and mixing, adding tetraethylammonium hydroxide solution in nitrogen atmosphere, heating for 30 minutes, raising the temperature to 110 ℃, and preserving the temperature for 10 minutes to obtain polyvinylidene fluoride solution;

and D2, sequentially adding acrylic acid and benzoyl peroxide into N-methyl pyrrolidone, stirring and mixing, adding the polyvinylidene fluoride solution prepared in the step D1 into the mixed solution, controlling the reaction temperature to be 70 ℃ for reaction for 30-40 minutes, after the reaction is finished, washing the product for 2-3 times by using deionized water, extracting by using absolute ethyl alcohol for 18-24 hours to remove unreacted acrylic acid, and after extraction, drying the product in a vacuum oven at the temperature of 70-80 ℃ for 8-12 hours to prepare the modified polyvinylidene fluoride.

Further, the dosage ratio of the polyvinylidene fluoride, the N-methyl pyrrolidone and the tetraethyl ammonium hydroxide solution in the step D1 is 3-5g: 15-30 mL: 2-4mL, wherein the concentration of the tetraethylammonium hydroxide solution is 3mL of tetraethylammonium hydroxide added in every 100mL of anhydrous methanol, and the dosage of the solution of N-methylpyrrolidone, acrylic acid, benzoyl peroxide and polyvinylidene fluoride in the step D2 is 15-20 mL: 2-4 g: 9-12 mg: 8-10 mL.

The invention has the beneficial effects that: the invention aims to provide a preparation method of a high-strength anti-aging anti-clogging reinforced composite geotextile, which comprises the steps of taking a polypropylene synthetic fiber and glass fiber mixed needle-punched non-woven fabric and a polyester woven fabric as base materials, uniformly coating a modified polyvinylidene fluoride emulsion on the non-woven fabric by a padding method to form a micron-scale microporous membrane, effectively intercepting fine sandstone waste particles, preventing the fine sandstone waste particles from leaking, simultaneously improving the drainage flux of the composite geotextile, and preventing clogging of the composite geotextile, wherein graphene oxide is added in the synthesis process of the polyvinylidene fluoride emulsion, the hydrophilicity of the graphene oxide is transferred to the surface of the emulsion, the covering rate of oxygen-containing groups O-C-O, C-O and C-O reaches 30.2 percent, the contact angle is reduced to 35.6 degrees, the hydrophilic modification of the graphene oxide on the emulsion is obvious, the drainage flux is greatly improved, and a large number of oxygen-containing groups also reduce the membrane resistance of the emulsion in film formation, pollutants are not easy to deposit on the surface and in the membrane pores, thus being beneficial to improving the anti-pollution performance of the membrane and maintaining stable permeability and reducing the occurrence of clogging; in addition, the modified calcium sulfate whisker and the glass fiber are added, the mechanical property of the composite geotextile is obviously improved, the longitudinal and transverse strength of the geotextile reaches 49kN/m, and the ultraviolet shielding agent nano TiO with excellent addition performance is added₂The ultraviolet light entering the polymer can be scattered, and the ultraviolet light energy can be absorbed to be released in a thermal or fluorescent mode, so that the damage of high-energy ultraviolet light to molecular chains of the polymer is avoided, the low visible light has scattering performance, and the anti-aging function of the composite geotextile is given while the transparency of the polymer material is maintained.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

The modified calcium sulfate whisker is prepared by the following steps:

adding 5g of titanate coupling agent into a three-neck flask, adding 25mL of acetone for dilution, adding 10g of calcium sulfate whisker into the flask, heating to 70 ℃, condensing, refluxing, magnetically stirring for 7 hours, after the reaction is finished, performing suction filtration on the product, washing the filter cake after the suction filtration with 30mL of ethanol solution twice, placing the product into a vacuum drying oven, and drying at 50 ℃ for 14 hours to obtain the modified calcium sulfate whisker.

Example 2

Nano TiO2₂The method comprises the following steps:

step C1, adding 1.25mmol titanium tetrachloride into a high-pressure reaction kettle, adding 20.3mmol3, 5-dimethylpiperidine, 6.5mg KH-570 and 60mmol deionized water, stirring and mixing for 0.5 hour, then placing the reaction kettle in an oven with the temperature set at 170 ℃ for heating for 4 days, then taking out the reaction kettle, and naturally cooling to room temperature to obtain a product;

step C2, centrifugally separating the product for 20 minutes, dispersing the precipitate in 20ml of absolute ethyl alcohol, ultrasonically oscillating for 10-20 minutes, placing the mixture in a vacuum drying oven, and drying for 5-6 hours at the temperature of 60-70 ℃ to obtain the nano TiO₂。

Example 3

The modified polyvinylidene fluoride is prepared by the following steps:

step D1, taking 3g of polyvinylidene fluoride into a flask, adding 20mL of LN-methyl pyrrolidone, stirring and mixing, adding 2mL of tetraethylammonium hydroxide solution into the nitrogen atmosphere, heating for 30 minutes, raising the temperature to 110 ℃, and preserving the temperature for 10 minutes to obtain polyvinylidene fluoride solution;

and D2, sequentially adding 2g of acrylic acid and 10mg of benzoyl peroxide into 15 mLN-methyl pyrrolidone, stirring and mixing, adding 8mL of the polyvinylidene fluoride solution prepared in the step D1 into the mixed solution, controlling the reaction temperature to be 70 ℃ for reaction for 30 minutes, after the reaction is finished, washing the product with deionized water for 3 times, extracting with absolute ethyl alcohol for 24 hours to remove unreacted acrylic acid, and after extraction, drying the product in a vacuum oven at 75 ℃ for 10 hours to obtain the modified polyvinylidene fluoride.

Example 4

TiO₂The/graphene oxide/polyvinylidene fluoride composite emulsion is prepared by the following steps:

step S1, placing the modified polyvinylidene fluoride and the graphene oxide in a vacuum oven at 70 ℃ for drying for 12 hours for later use;

step S2, dispersing 4mg of the graphene oxide prepared in the step S1 in 30mLN, N-dimethylformamide solution, and performing ultrasonic treatment for 9 hours to prepare graphene oxide dispersion liquid, wherein the volume fraction of the N, N-dimethylformamide solution is 70%;

step S3, adding 0.35g of nano TiO₂Dispersing in 30mLN, N-dimethyl formamide solution, ultrasonic processing for 5 hours to obtain nano TiO₂A dispersion, wherein the volume fraction of the N, N-dimethylformamide solution is 50%;

step S4, stirring and dissolving 4g of modified polyvinylidene fluoride prepared in step S1 and 1.2g of polyvinylpyrrolidone in a 50mLN, N-dimethylformamide solution, controlling the reaction temperature to 65 ℃, reacting for 3 hours to prepare polyvinylidene fluoride emulsion, adding 5mL of graphene oxide dispersion liquid prepared in step S2 and 10mL of nano TiO 3 prepared in step S3 into the polyvinylidene fluoride emulsion₂Dispersing the solution, and carrying out ultrasonic treatment for 0.5 hour to obtain TiO₂Graphene oxide/polyvinylidene fluoride composite emulsion.

Example 5

A preparation method of a high-strength anti-aging anti-clogging reinforced composite geotextile comprises the following steps:

step A1, uniformly mixing 20 parts of polypropylene, 10 parts of glass fiber and 4 parts of modified calcium sulfate whisker, feeding the mixture into a screw extruder, melting and extruding the mixture, transferring the mixture into a spinning box, spraying the mixture from a spinneret orifice of the spinning box, cooling the mixture by a side fan, carrying out air flow drafting on cooled tows by a tubular drafting device to achieve uniform splitting, uniformly laying the filaments on a coagulating screen curtain under the control of side-blown air flow, outputting the filaments to a needling machine by a pre-pressing roller, and reinforcing the fiber web by pre-needling and main needling to obtain the high-strength polypropylene geotextile, wherein the heating temperature of each section of the screw extruder is 160 ℃, 180 ℃, 200 ℃ and 210 ℃, and the screw rotation speed is 70 rpm;

step A2, ultrasonically cleaning the high-strength polypropylene non-woven fabric prepared in the step A1 for 20 minutes by using deionized water, and adopting a padding method and TiO₂After finishing the cleaned high-strength polypropylene non-woven fabric, putting the non-woven fabric into an oven after finishing, drying the non-woven fabric for 40 minutes at 80 ℃, taking out the non-woven fabric, cleaning the non-woven fabric for 2 times by using deionized water, and naturally drying the non-woven fabric to prepare the high-strength anti-aging anti-clogging reinforced composite geotextile, wherein the padding process comprises the steps of bath ratio of 1:25, soaking temperature of 25 ℃, soaking time of 3 minutes and roll pressure of 0.2 MPa;

step A3, weaving 20 parts of polyester fiber by a weaving machine to prepare woven grey cloth;

and A4, placing the high-strength anti-aging non-woven fabric prepared in the step A2 on the lower layer and the upper layer, placing woven grey cloth on the middle layer, and performing hot pressing and attaching, wherein the hot pressing pressure is 1800Kgf, the hot pressing temperature is 200 ℃, and the hot pressing time is 5min, so that the high-strength anti-aging anti-clogging reinforced composite geotextile is prepared.

Example 6

A preparation method of a high-strength anti-aging anti-clogging reinforced composite geotextile comprises the following steps:

step A1, uniformly mixing 25 parts of polypropylene, 12 parts of glass fiber and 5 parts of modified calcium sulfate whisker, feeding the mixture into a screw extruder, melting and extruding the mixture, transferring the mixture into a spinning box, spraying the mixture from a spinneret orifice of the spinning box, cooling the mixture by a side fan, carrying out air flow drafting on cooled tows by a tubular drafting device to achieve uniform splitting, uniformly laying the filaments on a coagulating screen curtain under the control of side-blown air flow, outputting the filaments to a needling machine by a pre-pressing roller, and reinforcing the fiber web by pre-needling and main needling to obtain the high-strength polypropylene geotextile, wherein the heating temperature of each section of the screw extruder is 160 ℃, 180 ℃, 200 ℃ and 210 ℃, and the screw rotation speed is 80 rpm;

step A2, ultrasonically cleaning the high-strength polypropylene non-woven fabric prepared in the step A1 for 10 minutes by using deionized water, and adopting a padding method and TiO₂After finishing the cleaned high-strength polypropylene non-woven fabric, putting the non-woven fabric into an oven after finishing, drying the non-woven fabric for 40 minutes at 90 ℃, taking out the non-woven fabric, cleaning the non-woven fabric for 3 times by using deionized water, and naturally drying the non-woven fabric to prepare the high-strength anti-aging anti-clogging reinforced composite geotextile, wherein the padding process comprises the steps of bath ratio of 1:25, soaking temperature of 25 ℃, soaking time of 3 minutes and roll pressure of 0.2 MPa;

step A3, weaving 23 parts of polyester fiber by a weaving machine to prepare woven grey cloth;

and step A4, placing the high-strength anti-aging non-woven fabric prepared in the step A2 on the lower layer and the upper layer, placing woven grey cloth on the middle layer, and performing hot pressing and attaching, wherein the hot pressing pressure is controlled to be 120Kgf, the hot pressing temperature is 160 ℃, and the hot pressing time is 3min, so that the high-strength anti-aging anti-clogging reinforced composite geotextile is prepared.

Example 7

A preparation method of a high-strength anti-aging anti-clogging reinforced composite geotextile comprises the following steps:

step A1, uniformly mixing 30 parts of polypropylene, 15 parts of glass fiber and 6 parts of modified calcium sulfate whisker, feeding the mixture into a screw extruder, melting and extruding the mixture, transferring the mixture into a spinning box, spraying the mixture from a spinneret orifice of the spinning box, cooling the mixture by a side fan, carrying out air flow drafting on cooled tows by a tubular drafting device to achieve uniform splitting, uniformly laying the filaments on a coagulating screen curtain under the control of side-blown air flow, outputting the filaments to a needling machine by a pre-pressing roller, and reinforcing the fiber web by pre-needling and main needling to obtain the high-strength polypropylene geotextile, wherein the heating temperature of each section of the screw extruder is 160 ℃, 180 ℃, 200 ℃ and 210 ℃, and the screw rotation speed is 90 rpm;

step A2, ultrasonically cleaning the high-strength polypropylene non-woven fabric prepared in the step A1 for 20 minutes by using deionized water, and adopting a padding method and TiO₂the/GO/polyvinylidene fluoride composite emulsion carries out after-treatment on the cleaned high-strength polypropylene non-woven fabric,after finishing, putting the geotextile into an oven, drying the geotextile for 30 minutes at 100 ℃, taking out the geotextile, cleaning the geotextile for 2 times by using deionized water, and naturally drying the geotextile to prepare the high-strength anti-aging anti-clogging reinforced composite geotextile, wherein the padding process comprises a bath ratio of 1:25, a soaking temperature of 25 ℃, a soaking time of 3 minutes and a roll pressure of 0.2 MPa;

step A3, weaving 25 parts of polyester fiber by a weaving machine to prepare woven grey cloth;

and step A4, placing the high-strength anti-aging non-woven fabric prepared in the step A2 on the lower layer and the upper layer, placing woven grey cloth on the middle layer, and performing hot pressing and attaching, wherein the hot pressing pressure is controlled to be 150Kgf, the hot pressing temperature is controlled to be 180 ℃, and the hot pressing time is 5min, so that the high-strength anti-aging anti-clogging reinforced composite geotextile is prepared.

Comparative example 1

Ordinary geotextile.

Comparative example 2

Comparative example 2 the process was prepared according to example 4, except that no glass fibers were added.

Comparative example 3

Comparative example 3 the preparation process is as in example 4, except that TiO₂Preparation method of/GO/polyvinylidene fluoride composite emulsion, TiO of comparative example 4₂The preparation method of the polyvinylidene fluoride emulsion comprises the following steps:

step S1, placing the modified polyvinylidene fluoride in a vacuum oven at 70 ℃ for drying for 12 hours for later use;

step S2, adding 0.35g of nano TiO₂Dispersing in 30mLN, N-dimethyl formamide solution, ultrasonic processing for 5 hours to obtain nano TiO₂A dispersion, wherein the volume fraction of the N, N-dimethylformamide solution is 50%;

step S3, stirring and dissolving 4g of modified polyvinylidene fluoride prepared in step S1 and 1.2g of polyvinylpyrrolidone in 50mLN, N-dimethylformamide solution, controlling the reaction temperature to 65 ℃, reacting for 3 hours to prepare polyvinylidene fluoride emulsion, adding 10mL of nano TiO2 prepared in step S2 into the polyvinylidene fluoride emulsion₂Dispersing the solution, and carrying out ultrasonic treatment for 0.5 hour to obtain TiO₂Polyvinylidene fluoride composite emulsion.

Comparative example 4

Comparative example 4 the preparation process is as in example 4, except that TiO₂The preparation method of the/GO/polyvinylidene fluoride composite emulsion comprises the following steps of:

step S1, placing the modified polyvinylidene fluoride and the graphene oxide in a vacuum oven at 70 ℃ for drying for 12 hours for later use;

step S2, dispersing 4mg of the graphene oxide prepared in the step S1 in 30mLN, N-dimethylformamide solution, and performing ultrasonic treatment for 9 hours to prepare graphene oxide dispersion liquid, wherein the volume fraction of the N, N-dimethylformamide solution is 70%;

step S3, stirring and dissolving 4g of modified polyvinylidene fluoride prepared in step S1 and 1.2g of polyvinylpyrrolidone in 50mLN, N-dimethylformamide solution, controlling the reaction temperature to 65 ℃, reacting for 3 hours to prepare polyvinylidene fluoride emulsion, adding 5mL of graphene oxide dispersion liquid prepared in step S2 into the polyvinylidene fluoride emulsion, and carrying out ultrasonic treatment for 0.5 hour to prepare TiO₂Graphene oxide/polyvinylidene fluoride composite emulsion.

Examples 5 to 7 and comparative examples 1 to 5 were subjected to the following performance measurements, using national standard GB/T15788-2005 "tensile test for strips of geotextile and related products", national standard GT/T14800-2010 "static bursting test for geosynthetic material (CBR method)" for CBR bursting strength, national standard GB/T13763-2010 "measurement of tearing strength for geosynthetic material in trapezoidal method" for trapezoidal tearing strength ", national standard GB/T15789-2005" measurement of vertical permeability characteristics for geotextile and related products when no load "for vertical permeability", national standard GB/T17634-1998 "measurement of effective pore size for geotextile and related products" for effective pore size ", samples of examples and comparative examples were subjected to ultraviolet irradiation for 15 days to observe surface morphology and evaluate anti-aging performance, the data are shown in table 1:

TABLE 1

As can be seen from table 1, the high-strength anti-aging anti-clogging reinforced composite geotextile produced in examples 5, 6 and 7 has excellent mechanical strength, reverse filtration function and anti-clogging property, and the anti-ultraviolet aging performance of the geotextile is remarkably improved, so that the service life of the geotextile is greatly prolonged; geotextile prepared in comparative example 4 without added TiO₂The ultraviolet resistance of the nano particles is reduced sharply, the geotextile prepared in the comparative example 3 is not added with graphene oxide, the vertical permeability of the geotextile is greatly affected, the drainage flux is greatly reduced, the effective aperture is smaller than that of the geotextile, and the surface of the geotextile is easy to pollute.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.