阅读说明：本技术 碳化锆改性布料及其制备方法与应用 (Zirconium carbide modified cloth and preparation method and application thereof ) 是由 于双恩 刘捷 熊日华 霍卫东 仝胜录 李小端 于 2019-09-25 设计创作，主要内容包括：本发明涉及纺织品领域,具体涉及一种碳化锆改性布料及其制备方法与应用。所述碳化锆改性布料包含碳化锆、整理剂和织物,其中,以织物的重量为基准,所述碳化锆的含量为1-30wt％；所述整理剂的含量为1-25wt％。本发明所提供的碳化锆改性布料不易褪色、色牢度高,且布料具有优异的透气性,所述碳化锆改性布料能够显著提高布料对太阳光的吸收和转化为热能的能力,用于含盐废水处理时,能够显著提高蒸发系统对含盐废水的蒸发效率。(The invention relates to the field of textiles, in particular to zirconium carbide modified cloth and a preparation method and application thereof. The zirconium carbide modified fabric comprises zirconium carbide, a finishing agent and a fabric, wherein the content of the zirconium carbide is 1-30 wt% based on the weight of the fabric; the content of the finishing agent is 1-25 wt%. The zirconium carbide modified fabric provided by the invention is not easy to fade and high in color fastness, has excellent air permeability, can remarkably improve the capacity of the fabric for absorbing sunlight and converting the sunlight into heat energy, and can remarkably improve the evaporation efficiency of an evaporation system for salt-containing wastewater when being used for treating the salt-containing wastewater.)

1. A zirconium carbide modified fabric, wherein the fabric comprises zirconium carbide, a finishing agent and a fabric, wherein the zirconium carbide is present in an amount of 1 to 30 wt%, based on the weight of the fabric; the content of the finishing agent is 1-25 wt%.

2. The zirconium carbide modified fabric of claim 1, wherein the zirconium carbide is present in an amount of 1 to 15 wt%, based on the weight of the fabric; the content of the finishing agent is 1-20 wt%.

3. The zirconium carbide modified fabric according to claim 1 or 2, wherein the fabric is selected from at least one of terylene, chinlon, acrylic, vinylon, polypropylene and polyvinyl chloride, preferably terylene;

preferably, the finishing agent is at least one selected from polyurethane, starch, protein, dextrin, animal glue, shellac, hide glue, rosin, water glass, butyl rubber, polyvinyl alcohol, carboxymethyl cellulose, vinyl acetate resin, acrylic resin, silicone polystyrene, polyacrylate and ethylene-vinyl acetate copolymer, preferably polyurethane;

more preferably, the weight average molecular weight of the polyurethane is 1000-50000, preferably 1000-6000;

preferably, the particle size of the zirconium carbide is 50nm to 80 μm, preferably 50 to 300 nm;

preferably, the fabric is a black fabric, more preferably a black polyester fabric.

4. The zirconium carbide modified cloth according to claim 3, wherein the black fabric is prepared by the following method:

dyeing the fabric at high temperature and high pressure by using dye liquor containing black disperse dye, washing and drying to obtain black fabric;

wherein the pH value of the dye solution is 5-6; the mass-volume ratio of the fabric to the dye liquor is 1: (1-25) g/L; the concentration of the dye liquor is 2-6% owf.

5. The zirconium carbide modified fabric of claim 4, wherein the high temperature and high pressure dyeing process is:

raising the temperature from room temperature to a first temperature at a first temperature raising rate, and carrying out heat preservation treatment at the first temperature; then cooling to a second temperature at a first cooling rate;

preferably, the first heating rate is 1-5 ℃/min, preferably 1-2 ℃/min;

preferably, the first temperature is 110-150 ℃, preferably 120-130 ℃;

preferably, the time of the heat preservation treatment is 30-90min, preferably 45-60 min;

preferably, the first cooling rate is 1-5 ℃/min, preferably 2-3 ℃/min;

preferably, the second temperature is 60-80 ℃, preferably 65-70 ℃;

preferably, the pressure of the dyeing is 2-4atm, preferably 2-3 atm.

6. The zirconium carbide modified cloth according to claim 4 or 5, wherein the black disperse dye is at least one selected from the group consisting of disperse black E-SNB 300%, disperse black ECO 300%, disperse black ECT 300%, disperse black H-BL 300%, and disperse black E-E300%;

preferably, the mass-volume ratio of the fabric to the dye liquor is 1: (2-20) g/L;

preferably, the concentration of the dye is 3-5% owf;

preferably, acetic acid and/or ammonium dihydrogen phosphate are used to adjust the pH of the dye liquor.

7. The zirconium carbide modified fabric of any one of claims 1 to 6, wherein the fabric is produced by a weaving process comprising:

(a) spinning the fiber to obtain single yarn;

(b) twisting the single yarn to obtain a folded yarn;

(c) weaving the folded yarn to obtain a fabric;

wherein the linear density of the single yarn is 20-40tex, preferably 25-35 tex; the twist of the single yarn is 360-520 twist/m, preferably 400-430 twist/m; the single yarn has a breaking strength of at least 500 cN; the number of hairiness of 3mm of the single yarn is less than 120/10 m; the single yarn has a yarn levelness CV value of 12% or less.

8. A method of preparing a zirconium carbide modified cloth according to any one of claims 1 to 7, wherein the method comprises the steps of:

(1) dissolving a finishing agent in a solvent to obtain a finishing agent solution, and adding zirconium carbide into the finishing agent solution to obtain a modified solution;

(2) and soaking the fabric in the modified solution, carrying out soaking and pressing by a press roller, and drying to obtain the zirconium carbide modified fabric.

9. The production method according to claim 8, wherein the solvent is selected from at least one of N, N-dimethylformamide, acetone, butanone, cyclohexanone, ethyl acetate, and toluene;

preferably, the method comprises repeating the impregnating and the pressing a plurality of times, more preferably at least 30 times;

preferably, the drying conditions include: the drying temperature is 10-130 ℃, preferably 50-70 ℃; the drying time is 3-12h, preferably 3-5 h;

preferably, the method further comprises the steps of cleaning and drying the zirconium carbide modified cloth.

10. Use of a zirconium carbide modified cloth according to any one of claims 1 to 7 in the treatment of saline wastewater.

Technical Field

The invention relates to the field of textiles, in particular to zirconium carbide modified cloth and a preparation method and application thereof.

Background

In the existing preparation and dyeing processes of cloth, the main focus is on improving the related quality of the cloth applied to human body, fashion, health and comfort are required for the cloth of clothes, and the research on the cloth applied to concentrated brine evaporation treatment is less, so that the service life, the ultraviolet resistance, the solar energy absorption capacity, the large specific surface area and the air permeability of the cloth are less considered.

A large amount of salt-containing wastewater is inevitably generated in the production process of industries such as oil extraction, refining, coal chemical industry and the like, the source of the salt-containing wastewater is wide and complex, and the salt-containing wastewater comprises salt-containing wastewater formed by circulating water system drainage, demineralized water system drainage, boiler drainage, concentrated water of a reuse water treatment system and the like, wherein the salt content is high, and the treatment difficulty is high. The method for treating the saline wastewater applied in China at present mainly comprises reverse osmosis, evaporator evaporation, membrane evaporation, natural evaporation and the like.

The evaporation pond is an effective method for treating low-concentration brine by adopting a natural evaporation technology, and in the prior art, white terylene is adopted for treating the water of the evaporation pond, so that the evaporation efficiency is low, and the characteristics of evaporation equipment and the geographical environment cannot be fully utilized.

CN103243588A discloses a method for dyeing polyester textiles at high temperature and high pressure, which adopts a dye liquor formed by mixing a high-proportion alcohol organic solvent, a small amount of water and disperse dyes to dye the polyester textiles under the conditions of high temperature and high pressure, thereby not only improving the dispersion performance of the disperse dyes, increasing the utilization rate of the dyes and the dye-uptake rate of fibers, avoiding dyeing defects such as dyeing defects, color spots, streaks and the like, but also reducing the dyeing difficulty, improving the dyeing effect and improving the dyeing quality. Solves the problems of difficult dyeing, poor level-dyeing property, large water consumption and serious pollution in the traditional polyester textile high-temperature high-pressure dyeing process. The adopted alcohol organic solvent is safe, nontoxic and easy to recycle, so that the water consumption in the dyeing process is greatly reduced, the discharge of waste liquid is reduced, and the method is safe, energy-saving, clean and environment-friendly.

CN108456973A discloses a preparation method of a high-permeability fabric, which comprises the preparation of pearl fibers, the preparation of polyvinyl acetate fibers and the preparation of a fabric. The preparation method is simple to operate and suitable for large-scale industrial production, the prepared cloth overcomes the problems that the existing cloth is easy to wrinkle and poor in wear resistance, and meanwhile, the cloth is good in air permeability, strong in moisture-conducting effect and high in evaporation rate of water molecules.

CN102286861A discloses a cloth low-pressure dyeing device and a dyeing method thereof, which comprises a sealed low-pressure chamber, a vacuum-pumping device communicated with the low-pressure chamber and used for vacuumizing the low-pressure chamber, a dye evaporation device arranged in the low-pressure chamber, and a winding device driving the cloth to move in the low-pressure chamber. The dyeing method of the cloth low-pressure dyeing device comprises the following steps: vacuumizing the closed box body to form low pressure; filling dye into the dye evaporation device, heating and evaporating the dye by a heater, and allowing the evaporated dye to enter the closed box body through a dye inlet under the action of low pressure; and driving the cloth to continuously pass through the position corresponding to the dye inlet. The device and the dyeing method realize anhydrous printing and dyeing, and are suitable for various synthetic fibers, natural fibers and mixed fiber cloth; the method can also be used for dyeing various fabrics by using inorganic dyes or organic dyes.

The cloth processed by the prior art is applied to human bodies, and the research focuses on beautiful color and comfortable wearing. The cloth provided can not meet the requirement of evaporation of strong brine under severe weather conditions.

Disclosure of Invention

The invention aims to overcome the problems in the prior art during salt-containing wastewater treatment, and provides a zirconium carbide modified fabric, a preparation method and application thereof.

In order to achieve the above object, a first aspect of the present invention provides a zirconium carbide modified fabric, wherein the fabric comprises zirconium carbide, a finishing agent and a fabric, wherein the zirconium carbide is present in an amount of 1 to 30 wt% based on the weight of the fabric; the content of the finishing agent is 1-25 wt%.

The second aspect of the present invention provides a method for preparing the zirconium carbide modified cloth of the present invention, wherein the method comprises the following steps:

(1) dissolving a finishing agent in a solvent to obtain a finishing agent solution, and adding zirconium carbide into the finishing agent solution to obtain a modified solution;

(2) and soaking the fabric in the modified solution, carrying out soaking and pressing by a press roller, and drying to obtain the zirconium carbide modified fabric.

The third aspect of the invention provides an application of the zirconium carbide modified cloth in salt-containing wastewater treatment.

Through the technical scheme, the invention has the following beneficial effects:

the zirconium carbide modified fabric provided by the invention has the capacity of absorbing sunlight and converting the sunlight into heat energy, can improve the air permeability of the fabric, and can obviously improve the evaporation efficiency of an evaporation system to salt-containing wastewater when the zirconium carbide modified fabric is used for treating the salt-containing wastewater.

Furthermore, in the zirconium carbide modified fabric provided by the invention, the fabric is a black polyester fabric prepared by a high-temperature high-pressure dyeing method, the color fastness of the fabric is more than 4 grade, the requirement of difficult fading in industry is met, extreme weather conditions can be overcome, solar energy is fully utilized, the evaporation efficiency of a natural evaporation system is further increased, and the absorption of solar energy by the fabric can be improved under the same conditions compared with the undyed polyester fabric.

Meanwhile, the polyester fabric used by the zirconium carbide modified cloth is prepared by adopting a specific weaving process, has the strength of not less than 2000N/5 x 20cm, has high specific surface area and water storage capacity, and can meet the use requirements of a natural evaporation system in extreme weather such as strong wind, strong ultraviolet rays and other severe environments.

Drawings

FIG. 1 is a graph showing the relationship between the evaporation rate of liquid water and the cloth or fabric provided in the examples and comparative examples, when the water temperature is 22 deg.C, the humidity is 20% and the wind speed is 5 m/s.

Detailed Description

The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.

The invention provides a zirconium carbide modified fabric, wherein the fabric comprises zirconium carbide, a finishing agent and a fabric, wherein the content of the zirconium carbide is 1-30 wt% based on the weight of the fabric; the content of the finishing agent is 1-25 wt%.

In the invention, the inventor researches and discovers that the zirconium carbide modified fabric can obviously improve the sunlight absorption and heat energy conversion capacity of the fabric and improve the air permeability of the fabric. When the zirconium carbide modified fabric provided by the invention is used for treating salt-containing wastewater, the evaporation efficiency of the salt-containing wastewater can be remarkably increased, and when the usage amounts of zirconium carbide and a finishing agent meet the above limit, the obtained zirconium carbide modified fabric has more excellent comprehensive performance.

Further, the content of the zirconium carbide is 1-15 wt% based on the total amount of the fabric; when the content of the finishing agent is 1-20 wt%, the obtained zirconium carbide modified fabric has more excellent comprehensive performance.

Further, the inventors have studied and found that when the concentration of the finishing agent is 5 wt% and the concentration of zirconium carbide is 5 wt%, the effect of the zirconium carbide modified fabric obtained by subjecting the fabric to the modification treatment is most excellent, and when the fabric is used for the treatment of salt-containing wastewater, the evaporation rate of the salt-containing wastewater is most excellent.

According to the invention, the fabric is selected from at least one of terylene, chinlon, acrylic fiber, vinylon, polypropylene fiber and polyvinyl chloride fiber, and preferably is terylene.

According to the invention, the finishing agent is at least one selected from polyurethane, starch, protein, dextrin, animal glue, shellac, hide glue, rosin, water glass, butyl rubber, polyvinyl alcohol, carboxymethyl cellulose, vinyl acetate resin, acrylic resin, silicone polystyrene, polyacrylate and ethylene-vinyl acetate copolymer, preferably polyurethane.

Preferably, the weight average molecular weight of the polyurethane is 1000-50000, preferably 1000-6000.

According to the invention, the zirconium carbide has a particle size of 50nm to 80 μm, preferably 50 to 300 nm.

According to the invention, the fabric is a black fabric, more preferably a black polyester fabric.

According to the invention, the black fabric is prepared by adopting the following method:

dyeing the fabric at high temperature and high pressure by using dye liquor containing black disperse dye, washing and drying to obtain black fabric;

wherein the pH value of the dye solution is 5-6; the mass-volume ratio of the fabric to the dye liquor is 1: (1-25) g/L; the concentration of the dye liquor is 2-6% owf.

According to the invention, the fabric is dyed by adopting a high-temperature high-pressure dyeing method, the dyeing temperature is increased, the chain segments of fiber molecules can move violently, the generated instantaneous pores are increased and enlarged, the diffusion of the dye molecules is increased, the diffusion rate of the dye to the interior of the fiber is increased, the dyeing rate is increased, the dyeing is completed until the dye is absorbed completely, and the cloth is dyed in a deep color. The color fastness of the black fabric prepared by the method is more than 4 grade, the requirement of difficult fading in industrial application is met, the fabric can fully utilize solar energy, and the evaporation efficiency is obviously improved.

In the invention, the color fastness of the fabric is measured by a sun-proof aging instrument with an Atlas Ci3000+ American model.

Specifically, the high-temperature high-pressure dyeing process comprises the following steps:

raising the temperature from room temperature to a first temperature at a first temperature raising rate, and carrying out heat preservation treatment at the first temperature; then the temperature is reduced to a second temperature at a first temperature reduction rate.

In the invention, the inventor researches the technological parameters of the high-temperature high-pressure dyeing process, and discovers that when the temperature is raised to 110-.

When the black fabric provided by the invention is used for treating salt-containing wastewater, the evaporation efficiency of the salt-containing wastewater can be remarkably increased.

Furthermore, when the first temperature rise rate is 1-2 ℃/min, the first temperature is 120-.

According to the invention, the black disperse dye is selected from at least one of disperse black E-SNB 300%, disperse black ECO 300%, disperse black ECT 300%, disperse black H-BL 300% and disperse black E-E300%.

According to the invention, the mass-to-volume ratio of the fabric to the dye liquor is 1: (2-20) g/L.

According to the invention, the concentration of the dye is 3-5% owf.

According to the invention, acetic acid and/or ammonium dihydrogen phosphate are used to adjust the pH value of the dyeing liquor.

The second aspect of the present invention provides a method for preparing a zirconium carbide modified cloth, wherein the method comprises the following steps:

(1) dissolving a finishing agent in a solvent to obtain a finishing agent solution, and adding zirconium carbide into the finishing agent solution to obtain a modified solution;

(2) and soaking the black polyester fabric in the modified solution, carrying out soaking and pressing by a press roller, and drying to obtain the zirconium carbide modified fabric.

According to the invention, zirconium carbide is added into the finishing agent solution to obtain the modified solution, and the modified solution is adopted to carry out modification treatment on the fabric, so that the obtained zirconium carbide modified fabric can effectively convert light energy into heat energy, and when the zirconium carbide modified fabric is used for treating salt-containing wastewater, the evaporation efficiency can be further improved.

According to the present invention, the solvent is selected from at least one of N, N-dimethylformamide, acetone, butanone, cyclohexanone, ethyl acetate, and toluene.

According to the invention, the impregnation and the impregnation are repeated a plurality of times, more preferably at least 30 times.

According to the invention, the conditions of drying include: the drying temperature is 10-130 ℃, preferably 50-70 ℃; the drying time is 3-12h, preferably 3-5 h;

according to the invention, the preparation method also comprises the steps of cleaning and drying the zirconium carbide modified cloth.

In order to further improve the mechanical property and the water storage capacity of the fabric, the fabric is prepared by adopting the following weaving process:

(a) spinning the fiber to obtain single yarn;

(b) twisting the single yarn to obtain a folded yarn;

(c) weaving the folded yarn to obtain a fabric;

wherein the linear density of the single yarn is 20-40tex, preferably 25-35 tex; the twist of the single yarn is 360-520 twist/m, preferably 400-430 twist/m; the single yarn has a breaking strength of at least 500 cN; the number of hairiness of 3mm of the single yarn is less than 120/10 m; the single yarn has a yarn levelness CV value of 12% or less.

In the invention, the fabric obtained by adopting the weaving process has excellent mechanical property, high specific surface area and high water storage capacity.

In one embodiment of the invention, the fabric is dyed by the dyeing method to obtain the black fabric, and when the black fabric is used for treating the salt-containing wastewater, the evaporation effect of the evaporation system on the salt-containing wastewater can be further increased.

In another embodiment of the invention, the fabric is dyed by the dyeing method provided by the invention to obtain a black fabric, the black fabric is modified by the method provided by the invention to obtain the zirconium carbide modified black fabric, and when the obtained zirconium carbide modified black fabric is used for treating the salt-containing wastewater, the evaporation effect of an evaporation system on the salt-containing wastewater can be further increased.

In another embodiment of the present invention, the fabric used is preferably a polyester fabric.

In another embodiment of the invention, cotton type polyester fibers are made into polyester fabrics according to the weaving process of the invention, the dyeing method of the invention is adopted to dye the polyester fabrics to obtain black polyester fabrics, the method provided by the invention is adopted to modify the black polyester fabrics to obtain zirconium carbide modified black polyester fabrics, and when the obtained zirconium carbide modified black polyester fabrics are used for treating salt-containing wastewater, the evaporation effect of an evaporation system on the salt-containing wastewater can be further increased.

According to the invention, the twist of the plied yarn is 50-150 twists/m, preferably 80-100 twists/m.

Preferably, the fabric is a plain weave; the warp density of the fabric is 8-24 pieces/cm, preferably 16-20 pieces/cm; the weft density of the fabric is 8-24 pieces/cm, preferably 10-14 pieces/cm; the width of the fabric is 0.5-3 m; preferably 1.5-2.5 m.

In the present invention, the black fabric and the fabric used in the zirconium carbide modified black fabric may be commercially available, and preferably, the fabric provided in the present invention.

The third aspect of the invention provides an application of the zirconium carbide modified cloth in salt-containing wastewater treatment.

The present invention will be described in detail below by way of examples. In the following examples of the present invention,

the mechanical property of the cloth is tested by adopting an electronic fabric strength tester;

polyester fabric I is purchased from the market, polyester 120-7 polyester filter cloth is used, and the warp density is as follows: 15.6 roots/cm, weft density: 10.5 roots/cm, strength: 3200N, thickness of 1.32mm, gram weight of 627g/m²；

The color fastness of the cloth was measured using a sun-aging resistant instrument of Atlas Ci3000 +.

The polyester fabric II is prepared by adopting the following preparation example;

the black disperse dye is 300 percent of disperse black ECT and is purchased from Zhejiang Longsheng dye chemical Co., Ltd;

the finishing agent is polyurethane, the weight-average molecular weight is 1000-;

examples and comparative examples all other materials were commercially available.

Preparation example

Spinning selected cotton type polyester fibers (with the length of 38mm and the linear density of 5D) into a polyester single yarn with the linear density of 30tex and the twist of 420 twist/m by a traditional spinning process, wherein the breaking strength of the single yarn is more than 500cN, the number of hairiness of 3mm is less than 120/10 m, and the yarn evenness CV value is less than 12%; plying and twisting the 6 single yarns into one single yarn on a two-for-one twister, wherein the twist of the plied yarn is 100 twists/m; the plied yarns are woven in a weaving mode, and the fabric weave structure is a polyester fabric II with plain weave, the warp density of 18 threads/cm, the weft density of 12 threads/cm and the fabric width of 1.98 m.

Example 1

Selecting a polyester fabric I, preparing a dye liquor of a dye liquor concentration of 4% owf black disperse dye, controlling the pH value of the dye liquor to be 5.5, adjusting the pH value by acetic acid and ammonium dihydrogen phosphate, adding a cloth sample and the dye liquor into a high-temperature dye vat according to a dyeing bath ratio of 1:20 (weight of the fabric: volume of the dye liquor), and adjusting the air pressure of the dye vat to be 2ATM (2.02 multiplied by 105 Pa); in the temperature rise stage, the temperature rise rate is controlled to be 2 ℃/min, the condition that the fabric is heated unevenly due to too fast temperature rise is prevented, so that the fabric is dyed unevenly, and the temperature rise is stopped when the temperature rises to 120 ℃. And in the heat preservation stage, the temperature is kept for 60min, so that the dye is fully infiltrated into the fiber. In the cooling stage, the cooling rate is controlled to be 3 ℃/min, the damage of a polyester fiber crystallization area caused by the excessively high cooling rate is prevented, and a temperature control system can be closed to rapidly and naturally cool the polyester fiber crystallization area to the normal temperature after the temperature is reduced to 70 ℃ (the glass transition temperature of the polyester fiber); and (5) washing the dyed cloth sample with clear water and drying to obtain the black polyester fabric A1. The color fastness of the fabric is shown in table 2.

Example 2

The polyester fabric was dyed in the same manner as in example 1, except that: and replacing the polyester fabric I with the polyester fabric II to prepare the black polyester fabric A2. The color fastness of the fabric is shown in table 2.

Example 3

Dissolving polyurethane particles in N-N Dimethylformamide (DMF) to obtain polyurethane solutions with the concentration of 5 wt%, and adding nano ZrC (with the particle size of 50nm-300nm) into the polyurethane solutions to prepare modified solutions with the concentration of ZrC of 5 wt%;

soaking the black polyester fabric A1 in the modified solution, carrying out immersion pressing through a roller press, soaking the fabric in the finishing agent, carrying out immersion pressing through the roller press, repeating the operation for 30 times to ensure that the finishing agent can fully permeate the interior of the fabric and be uniformly distributed on the surface of the fiber, then putting the fabric into an oven to be dried for 4 hours at 60 ℃, and finally cleaning and drying the dried fabric sample to obtain the zirconium carbide modified black fabric A3. The color fastness of the cloth is shown in table 2.

Example 4

A zirconium carbide modified black cloth was prepared according to the method of example 3, except that: the concentration of the polyurethane is 10 wt%, and the zirconium carbide modified black fabric A4 is prepared. The color fastness of the cloth is shown in table 2.

Example 5

A zirconium carbide modified black cloth was prepared according to the method of example 3, except that: the concentration of the polyurethane is 15 wt%, and the zirconium carbide modified black fabric A5 is prepared. The color fastness of the cloth is shown in table 2.

Example 6

A zirconium carbide modified black cloth was prepared according to the method of example 3, except that: and preparing a zirconium carbide modified black fabric A6 from a polyurethane solution with the concentration of 20 wt% of polyurethane. The color fastness of the cloth is shown in table 2.

Example 7

A zirconium carbide modified black cloth was prepared according to the method of example 3, except that: the black polyester fabric A2 is adopted to replace the black polyester fabric A1, and the zirconium carbide modified black fabric A7 is prepared. The color fastness of the cloth is shown in table 2.

Example 8

Zirconium carbide modified cloth was prepared according to the method of example 3, except that: and replacing the black polyester fabric A1 with the polyester fabric I to prepare zirconium carbide modified cloth A8. The color fastness of the fabric is shown in table 2.

Test example

Climate conditions of the experiment: the light intensity is 100000lux, the humidity is 20%, the air temperature is 26 ℃, the water temperature is 22 ℃, the wind speed is 5m/s, and the water quality information of the concentrated brine is shown in table 1.

TABLE 1

Ion species	Ion concentration (mg/L)
		Ca2+	500
Mg2+	530
		Na+	8737
NH4 +	1540
		SO4 2-	23980
Cl-	620

The dacron fabric I, the black dacron fabrics A1-A2 provided by examples 1-2, the zirconium carbide modified black cloth A3-A7 provided by examples 3-7 and the zirconium carbide modified cloth A8 provided by comparative example 1 were used for evaporation of concentrated brine, and the evaporation rates of the respective concentrated brines were tested by the following specific test methods: hanging the cloth, allowing air to flow around, keeping the temperature constant, fixing the air speed, pumping the strong brine from the lower part to the upper part of the cloth by using a circulating pump, allowing the strong brine to uniformly flow down, weighing the weight of the residual strong brine at regular time, calculating the evaporation efficiency, and calculating the evaporation rate by using the initial strong brine weight m₀Subtract the weight m of the strong brine at the end₁Then dividing the difference by the evaporation time t and then by the area s of the cloth, i.e.

u＝(m₀-m₁)/(t×s)

The test results are shown in table 2.

TABLE 2

Fabric or cloth	Evaporation rate, kg/m2h	Color fastness
			A1	0.85	4
A2	0.92	4
			A3	1.05	4
A4	1.04	4
			A5	1.02	4
A6	0.98	4
			A7	1.12	4
A8	0.90	--
			Terylene fabric I	0.66	--

As shown in table 2, compared with unmodified polyester fabric I, the zirconium carbide modified fabric provided in embodiments 1 to 8 of the present invention can significantly improve the evaporation efficiency when concentrated brine is evaporated when used for treating saline wastewater.

Further, as can be seen from examples 3-6, the cloth obtained by modifying the black fabric dyed at high temperature with zirconium carbide provides a further improvement in the evaporation rate of the concentrated brine.

The specific polyester fabric of the invention is adopted to replace the polyester fabric in the prior art, so that the evaporation efficiency of the concentrated brine during evaporation can be further improved.

The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.