Anti-copper ion pollution type cross-linked modified bentonite waterproof blanket and preparation process thereof

Abstract

The application provides an anti-copper ion pollution crosslinking modified bentonite waterproof blanket and a preparation process thereof. The waterproof blanket comprises a woven cloth layer, a bentonite layer and a geotextile layer from top to bottom, and the bentonite layer is crosslinking modified by phosphoric acid modified bentonite and graphene with a mass ratio of 10000:1. The preparation process comprises the following steps: S1, purification of sodium-based bentonite; S2, phosphoric acid modification of the sodium-based bentonite; S3, graphene modification of the phosphoric acid modified sodium-based bentonite; and S4, locking the modified sodium-based bentonite in step S3 between the woven cloth and the geotextile to obtain the anti-copper ion pollution crosslinking modified bentonite waterproof blanket. The application provides the anti-copper ion pollution crosslinking modified bentonite waterproof blanket, which can have a good adsorption and isolation effect on copper ions, effectively prevent the diffusion of copper ions and prevent environmental pollution.

Description

Technical Field

[0001] This invention relates to the field of waterproof blanket technology, specifically to a copper ion-resistant cross-linked modified bentonite waterproof blanket and its preparation process. Background Technology

[0002] Bentonite waterproofing blanket (GCL) is a new type of waterproof membrane with sodium-based bentonite as its main component. It is a geosynthetic material specifically designed for seepage prevention in artificial lakes and water features, landfills, underground garages, rooftop gardens, pools, oil depots, and chemical storage yards. It consists of highly expansive sodium-based bentonite filled between specially made composite geotextile and non-woven fabric. The bentonite waterproofing mat, made by needle punching, forms many small fiber spaces, preventing the bentonite particles from flowing in one direction. When it comes into contact with water, it forms a uniform, high-density gel-like waterproof layer inside the mat, solving the problems of sealing, isolation, and seepage prevention. It has good effects and strong resistance to damage.

[0003] Due to the ion exchange properties of bentonite, sodium ions in the interlayer are easily replaced by copper ions, causing a decrease in the swelling index of bentonite and thus reducing the seepage prevention performance of the bentonite waterproof blanket. Therefore, ordinary bentonite waterproof blankets cannot effectively prevent the diffusion of copper ions in a copper ion environment, leading to copper ion contamination. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, this invention provides a cross-linked modified bentonite waterproof blanket that resists copper ion pollution. It has a good adsorption and isolation effect on copper ions, effectively preventing the diffusion of copper ions and preventing environmental pollution.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A copper ion-resistant cross-linked modified bentonite waterproof blanket comprises, from top to bottom, a woven fabric layer, a bentonite layer, and a geotextile layer. The bentonite layer is made of phosphate-modified bentonite and graphene cross-linked in a mass ratio of 10000:1.

[0007] Furthermore, the bentonite layer contains no less than 5.5 kg per square meter of waterproof blanket.

[0008] This invention also provides a process for preparing a copper ion-resistant cross-linked modified bentonite waterproof blanket, comprising the following steps:

[0009] S1, sodium-based bentonite refining;

[0010] S2, sodium-based bentonite phosphoric acid modification;

[0011] S3, Phosphoric acid modified sodium bentonite graphene modification;

[0012] S4. Lock the modified sodium-based bentonite from step S3 between the woven fabric and the geotextile to obtain a copper ion-resistant cross-linked modified bentonite waterproof blanket.

[0013] Furthermore, in step S2, the specific steps are as follows:

[0014] S21. Mix the refined sodium bentonite with the phosphoric acid solution at a mass-to-volume ratio of 1:5.

[0015] S22. Heat in a water bath and stir for a period of time, then filter.

[0016] S23. After washing, dry to constant weight;

[0017] S24. Phosphate-modified sodium-based bentonite is obtained by grinding.

[0018] Furthermore, in step S22, the water bath temperature is 75℃, the stirring speed is 100-150 r / min, and the stirring time is 8h; in step S23, the mixture is washed 3 times with deionized water and dried at 75℃; in step S24, the mixture is ground through a 250-mesh sieve.

[0019] Furthermore, in step S3, the specific steps are as follows:

[0020] S31. Mix graphene oxide and ethanol in a certain proportion, stir, and evaporate the ethanol to obtain a graphene solution.

[0021] S32. Mix phosphate-modified sodium bentonite, graphene solution, and deionized water in a certain proportion, stir, and then filter.

[0022] S33. Dry the filtrate;

[0023] S34. After grinding and drying, the product is obtained as cross-linked modified sodium bentonite.

[0024] Furthermore, in step S31, the mass ratio of graphene oxide to ethanol is 1:500; in step S32, the mass ratio of phosphate-modified sodium bentonite powder to graphene solution and deionized water is 20:1:500.

[0025] Furthermore, in step S31, the stirring speed is 1000-1200 r / min and the stirring time is 30 min; in step S32, the stirring speed is 200-250 r / min and the stirring time is 10 h; in step S33, the drying temperature is 100℃ and the drying time is 24 h; in step S34, the material is ground through a 250 mesh sieve.

[0026] Furthermore, in step S1, the specific steps are as follows:

[0027] S11. Crush sodium-based bentonite and mix it with deionized water at a volume ratio of 1:25, then soak it.

[0028] S12. Centrifuge the mixed solution to remove impurities;

[0029] S13, Drying;

[0030] S14. Grind to obtain refined sodium bentonite.

[0031] Furthermore, in step S11, the soaking time is 48 hours; in step S13, the drying temperature is 105℃ and the drying time is 8 hours; in step S14, the material is ground through a 250-mesh sieve.

[0032] Compared with the prior art, the present invention has the following beneficial technical effects:

[0033] 1. This invention utilizes phosphoric acid / graphene-modified bentonite to manufacture a copper ion-resistant phosphoric acid and graphene cross-linked modified sodium-based bentonite waterproof blanket. It features a simple manufacturing process and low cost, and is an effective way to solve copper ion pollution.

[0034] 2. The graphene π bonds present on the bentonite powder after graphene modification can interact with copper ions, effectively adsorbing copper ions and preventing their diffusion.

[0035] 3. The sodium-based bentonite of the present invention, after being modified with phosphoric acid / graphene, has a significantly improved adsorption performance for copper ions. The sodium-based bentonite waterproof blanket with phosphoric acid and graphene crosslinking modified with this material as raw material has a good adsorption and isolation effect on copper ions, which can effectively prevent the diffusion of copper ions and prevent environmental pollution. Detailed Implementation

[0036] Numerous specific details are set forth in the following description to provide a full understanding of the invention. However, the invention can be practiced in many other ways than those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0037] Example 1

[0038] The copper ion-resistant cross-linked modified bentonite waterproof blanket comprises, from top to bottom, a woven fabric layer, a bentonite layer, and a geotextile layer. The bentonite layer is made of phosphate-modified bentonite and graphene cross-linked at a mass ratio of 10000:1. The bentonite content in each square meter of the waterproof blanket is no less than 5.5 kg.

[0039] The preparation process of a copper ion-resistant cross-linked modified bentonite waterproof blanket includes the following steps:

[0040] S1, Sodium Bentonite Refining

[0041] S11. The lumpy sodium-based bentonite is crushed by an ultrafine pulverizer and mixed evenly with deionized water at a volume ratio of 1:25, and soaked for 48 hours.

[0042] S12. Place the mixed solution in a centrifuge for high-speed rotation separation to remove impurities;

[0043] S13. Place the centrifuged and purified sodium-based bentonite into a constant temperature forced-air drying oven and dry it at 105℃ for 8 hours.

[0044] S14. Grind the dried product using a pulverizer and pass it through a 250-mesh sieve to obtain refined sodium-based bentonite.

[0045] S2, sodium-based bentonite phosphoric acid modification

[0046] S21. Mix the refined sodium bentonite with a 20% phosphoric acid solution at a mass-to-volume ratio of 1:5 (i.e., 1 kg of sodium bentonite powder to 5 L of phosphoric acid solution);

[0047] S22. Heat in a water bath and stir for 8 hours at a speed of 100-150 r / min and a temperature of 75°C, then filter.

[0048] S23. Wash three times with deionized water and place in a constant temperature forced-air drying oven to dry to constant weight at 75°C.

[0049] S24. After grinding with a pulverizer and passing through a 250-mesh sieve, phosphate-modified sodium-based bentonite is obtained.

[0050] S3, Phosphate-modified sodium-based bentonite graphene-modified

[0051] S31. Mix graphene oxide and ethanol in a ratio of 1g graphene to 500g ethanol. Stir with a magnetic stirrer at a speed of 1000-200r / min for 30min. Evaporate the ethanol using a rotary evaporator to obtain a graphene solution.

[0052] S32. Mix phosphate-modified sodium bentonite, graphene solution, and deionized water at a mass ratio of 20:1:500 (i.e., 20 kg of phosphate-modified sodium bentonite powder, 1 kg of graphene solution, and 500 kg of deionized water), stir at a speed of 200-250 r / min for 10 h, and then filter.

[0053] S33. Place the filtrate in a 100℃ drying oven and dry for 24 hours;

[0054] S34. Grind the material using a pulverizer and pass it through a 250-mesh sieve to obtain copper ion-resistant sulfuric acid / quaternary ammonium salt crosslinked modified sodium-based bentonite.

[0055] S4. Using waterproof blanket production equipment, the sodium-based bentonite modified in step S3 is locked between the woven fabric and the geotextile to obtain a copper ion-resistant cross-linked modified bentonite waterproof blanket.

[0056] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A process for preparing a copper ion-resistant cross-linked modified bentonite waterproof blanket, characterized in that, Includes the following steps: S1, sodium-based bentonite refining; S2, sodium-based bentonite phosphoric acid modification; S21. Mix the refined sodium bentonite with the phosphoric acid solution at a mass-to-volume ratio of 1:

5. S22. Heat in a water bath and stir for a period of time, then filter. Water bath temperature 75℃, stirring speed 100~150r / min, stirring time 8h; S23. After washing, dry to constant weight, wash 3 times with deionized water, and dry at 75℃. S24. Phosphate-modified sodium-based bentonite was obtained by grinding and passing through a 250-mesh sieve; S3, Phosphoric acid modified sodium bentonite graphene modification; S31. Mix graphene oxide and ethanol at a mass ratio of 1:500, stir at a stirring speed of 1000-1200 r / min for 30 min, and then evaporate the ethanol to obtain a graphene solution. S32. Mix phosphate-modified sodium bentonite, graphene solution, and deionized water in a mass ratio of 20:1:500, stir, filter, stir at a speed of 200-250 r / min, and stir for 10 h. S33. Dry the filtrate at 100℃ for 24 hours. S34. After grinding through a 250-mesh sieve and drying, the product is obtained as cross-linked modified sodium bentonite. S4. Lock the modified sodium-based bentonite from step S3 between the woven fabric and the geotextile to obtain a copper ion-resistant cross-linked modified bentonite waterproof blanket.

2. The preparation process of the copper ion-resistant cross-linked modified bentonite waterproof blanket according to claim 1, characterized in that, In step S1, the specific steps are as follows: S11. Crush sodium-based bentonite and mix it with deionized water at a volume ratio of 1:25, then soak it. S12. Centrifuge the mixed solution to remove impurities; S13, Drying; S14. Grind to obtain refined sodium bentonite.

3. The preparation process of the copper ion-resistant cross-linked modified bentonite waterproof blanket according to claim 2, characterized in that: In step S11, the soaking time is 48 hours; in step S13, the drying temperature is 105℃ and the drying time is 8 hours; in step S14, the material is ground through a 250-mesh sieve.