CN109912917B - Isolation tectorial membrane for soil restoration and preparation method thereof - Google Patents
Isolation tectorial membrane for soil restoration and preparation method thereof Download PDFInfo
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Abstract
The invention provides a preparation method of an isolation tectorial membrane for soil restoration, which comprises the following steps: the preparation method comprises the following steps of (I) grafting high-density polyethylene with acrylic acid, (II) preparing tetrafluorophenyl benzophenone ionic polymer, (III) modifying surface with fluorinated graphene, and (IV) preparing membrane. The invention also discloses the isolation covering film for soil remediation, which is prepared according to the preparation method of the isolation covering film for soil remediation. The preparation method disclosed by the invention is simple and feasible, mild in condition and low in manufacturing cost; the prepared isolation covering film for soil remediation has the advantages of low manufacturing cost, excellent permeation resistance, mechanical property and corrosion resistance, good weather resistance and performance stability, long service life, antibiosis and antistatic properties.
Description
Technical Field
The invention relates to the technical field of soil remediation, in particular to an isolation tectorial membrane for soil remediation and a preparation method thereof.
Background
With the progress of society and the development of modern chemical industry and agriculture, the influence of human beings on the natural environment is more and more profound. From agricultural chemical fertilizers, pesticides, transgenic organisms, industrial three wastes, sewage and garbage in daily life and space garbage in national defense and aerospace industries, the waste and the garbage do not influence the nature, cause various environmental problems and bring serious threats to the health of people. One of the prominent environmental problems is soil pollution, which is not easy to diffuse or dilute like air pollution or water pollution, and once harmful substances enter soil, the soil is difficult to degrade, and when various pollutants contained in the soil are too much and affect and exceed the self-cleaning capacity of the soil, the composition, structure and function of the soil are changed, and the activity of microorganisms is inhibited, so that the yield and quality of crops are reduced, and the human health is harmed through the transmission and enrichment of a food chain. Therefore, the treatment of soil pollution is not slow enough.
The method for repairing soil in the prior art mainly comprises the steps of adding a soil repairing agent for repairing and a film-coating isolation sealing treatment method. The method for repairing by adding the soil repairing agent has the defects that the repairing cost is high, secondary pollution is easily caused by using the method, the soil repairing effect is poor and the like, so that the wide application of the method is limited. The tectorial membrane isolation method has low cost and good effect, and becomes one of the mainstream soil remediation technologies at the present stage and for a period of time in the future.
In the process of soil remediation by a film-covering isolation method, an essential material is an isolation film, and the quality of the performance of the isolation film directly determines the quality of the remediation effect of the soil remediation method. However, the isolation film for soil remediation at present is mainly a high-density polyethylene film, and although such film materials have a very low permeability coefficient and good flexibility, the puncture resistance, corrosion resistance and tear resistance are weak, and the stability, antistatic performance and flame retardant performance are not good.
Therefore, the development of the isolation film for soil remediation, which has the advantages of lower permeability coefficient, more excellent puncture resistance, corrosion resistance, tear resistance, weather resistance and high and low temperature resistance, meets the market demand, has wide market value and application prospect, and has a positive effect on promoting the wide application of the film isolation method in soil remediation.
Disclosure of Invention
The invention mainly aims to provide an isolation film for soil remediation, which overcomes the technical problems of poor mechanical property, corrosion resistance and performance stability and weak weather resistance and high and low temperature resistance of a polyethylene film, and has the advantages of low manufacturing cost, excellent permeation resistance, mechanical property and corrosion resistance, good weather resistance and performance stability, long service life, bacteria resistance and static resistance. The invention also provides a preparation method of the isolation covering film for soil remediation.
In order to achieve the above purpose, the invention provides a preparation method of an isolation tectorial membrane for soil remediation, which comprises the following steps:
i high-density polyethylene grafted acrylic acid: uniformly mixing high-density polyethylene, acrylic acid, acrylonitrile and an initiator in advance, adding the mixture into a rheometer, and carrying out melt mixing grafting under the conditions that the temperature is 180 ℃ and 190 ℃ and the rotating speed is 30-40rmp, wherein the reaction time is 20-30 minutes, so as to obtain acrylic acid grafted high-density polyethylene;
II, preparation of ionic polymer based on tetrafluoro phenyl benzophenone: dissolving 2,3,5, 6-tetrafluoro-1, 4-bis (chloromethyl) benzene and tetraethyl mikrolon in a high-boiling point solvent, stirring and reacting for 15-20 hours at 60-80 ℃, then separating out in ethanol, washing the separated out polymer with diethyl ether for 3-5 times, then removing the diethyl ether by rotary evaporation, and placing in a vacuum drying oven at 50-60 ℃ to dry to constant weight;
III, surface modification of fluorinated graphene: dispersing fluorinated graphene in an organic solvent, adding trimethoxy [2- (7-oxabicyclo [4.1.0] hept-3-yl) ethyl ] silane, stirring and reacting at 60-80 ℃ for 10-12 hours, then performing rotary evaporation to remove the solvent, washing with water for 3-5 times, and then placing in a vacuum drying oven to be dried to constant weight at 80-90 ℃;
IV, preparation of a film: dispersing the surface modified fluorinated graphene prepared in the step III in N, N-dimethylformamide, adding the acrylic acid grafted high-density polyethylene prepared in the step I and the ionic polymer based on the tetrafluoro phenyl benzophenone prepared in the step II, uniformly mixing, and pouring at 75-85 ℃ to form a film, thereby obtaining the isolation covering film for soil remediation.
Preferably, the mass ratio of the high-density polyethylene, the acrylic acid, the acrylonitrile and the initiator in the step I is (3-5):0.5:0.5: (0.01-0.02).
Preferably, the initiator is selected from one or more of azobisisobutyronitrile, azobisisoheptonitrile and sodium persulfate.
Preferably, the mass ratio of the 2,3,5, 6-tetrafluoro-1, 4-bis (chloromethyl) benzene, the tetraethyl mikrolon and the high-boiling-point solvent in the step II is 1:1.31 (10-15).
Preferably, the high boiling point solvent is selected from one or more of dimethyl sulfoxide, N-dimethylformamide and N-methylpyrrolidone.
Preferably, the mass ratio of the fluorinated graphene, the organic solvent and the trimethoxy [2- (7-oxabicyclo [4.1.0] hept-3-yl) ethyl ] silane in the step III is (3-5): (10-15): 0.5.
Preferably, the organic solvent is selected from one or more of ethanol, acetonitrile and tetrahydrofuran.
Preferably, the mass ratio of the surface modified fluorinated graphene, the N, N-dimethylformamide, the acrylic acid grafted high-density polyethylene and the tetrafluorobenzophenones ionic polymer in the step IV is (0.1-0.2): (20-25):1: 0.5.
An isolation tectorial membrane for soil restoration is prepared according to the preparation method of the isolation tectorial membrane for soil restoration.
Due to the application of the technical scheme, the invention has the following beneficial effects:
(1) the isolation tectorial membrane for soil remediation disclosed by the invention has the advantages of simple and easy preparation method, mild reaction conditions, easily available raw materials and low price, and is suitable for large-scale production.
(2) The isolation tectorial membrane for soil restoration disclosed by the invention overcomes the technical problems of poor mechanical property, corrosion resistance and performance stability, and weak weather resistance and high and low temperature resistance of a polyethylene membrane, and has the advantages of low manufacturing cost, good membrane forming property, excellent permeability resistance, mechanical property and corrosion resistance, good weather resistance and performance stability, long service life, and antibiosis and antistatic properties.
(3) According to the isolation covering film for soil remediation, disclosed by the invention, the high-density polyethylene is modified, so that the good impermeability and flexibility of the high-density polyethylene are kept, an acrylic acid structure is introduced as a cross-linking site, and the cross-linking site and an ionic polymer based on tetrafluoro phenyl benzophenone are subjected to an ionic cross-linking reaction during film formation to form a three-dimensional network structure, so that the comprehensive performance of the film can be obviously improved; the fluorobenzene and benzophenone structures are introduced on the basis of the tetrafluorobenzyl ketone ionic polymer main chain, so that the weather resistance, the corrosion resistance and the performance stability of the film are improved, and the ionic group structures are introduced on the main chain, so that on one hand, a crosslinking site is provided, on the other hand, an antistatic effect is achieved, and safety accidents during soil isolation and repair construction are prevented; in addition, the soil conditioner can also play a role in resisting and inhibiting bacteria, preventing the membrane from mildewing and corroding and reducing the microbial decomposition of the membrane during soil remediation; thirdly, positive charges carried on the main chain are mutually exclusive with heavy metal ions in the soil, so that the solid seal repair of the heavy metal ions is facilitated, and the permeation of the heavy metal ions is reduced; the high-density polyethylene grafted polyacrylic acid can also enhance the adhesive property of each component and the adhesiveness of the coating to a substrate, and is easy to fix.
(4) The isolation covering film for soil remediation disclosed by the invention has the advantages that the surface modification fluorinated graphene is introduced to play a role in enhancing the impermeability, and the compatibility with macromolecules and the self dispersion uniformity of the macromolecules are enhanced through surface modification; all structures have synergistic effect, so that the comprehensive performance of the membrane is excellent.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.
The raw materials described in the examples of the present invention were purchased from Mobei (Shanghai) Biotech limited.
Example 1
A preparation method of an isolation tectorial membrane for soil remediation comprises the following steps:
i high-density polyethylene grafted acrylic acid: uniformly mixing 30g of high-density polyethylene, 5g of acrylic acid, 5g of acrylonitrile and 0.1g of azobisisobutyronitrile in advance, adding the mixture into a rheometer, and carrying out melt mixing grafting under the conditions that the temperature is 180 ℃ and the rotating speed is 30rmp, wherein the reaction time is 20 minutes, so as to obtain acrylic acid grafted high-density polyethylene;
II, preparation of ionic polymer based on tetrafluoro phenyl benzophenone: dissolving 10g of 2,3,5, 6-tetrafluoro-1, 4-bis (chloromethyl) benzene and 13.1g of tetraethyl mesityl ketone in 100g of dimethyl sulfoxide, stirring and reacting at 60 ℃ for 15 hours, then precipitating in ethanol, washing the precipitated polymer with diethyl ether for 3 times, then removing the diethyl ether by rotary evaporation, and placing in a vacuum drying oven at 50 ℃ to dry to constant weight;
III, surface modification of fluorinated graphene: dispersing 30g of fluorinated graphene in 100g of ethanol, adding 5g of trimethoxy [2- (7-oxabicyclo [4.1.0] hept-3-yl) ethyl ] silane, stirring and reacting at 60 ℃ for 10 hours, then performing rotary evaporation to remove the solvent, washing with water for 3 times, and then placing in a vacuum drying oven to dry at 80 ℃ until the weight is constant;
IV, preparation of a film: dispersing 1g of the surface-modified fluorinated graphene prepared in the step III in 200g of N, N-dimethylformamide, adding 10g of the acrylic acid grafted high-density polyethylene prepared in the step I and 5g of the tetrafluoro-benzophenone ionic polymer prepared in the step II, uniformly mixing, and pouring at 75 ℃ to form a film, thereby obtaining the isolation film for soil remediation.
An isolation tectorial membrane for soil restoration is prepared according to the preparation method of the isolation tectorial membrane for soil restoration.
Example 2
A preparation method of an isolation tectorial membrane for soil remediation comprises the following steps:
i high-density polyethylene grafted acrylic acid: uniformly mixing 35g of high-density polyethylene, 5g of acrylic acid, 5g of acrylonitrile and 0.13g of azobisisoheptonitrile in advance, adding into a rheometer, and carrying out melt mixing grafting under the conditions of 183 ℃ and 32rmp of rotation speed, wherein the reaction time is 23 minutes, so as to obtain acrylic acid grafted high-density polyethylene;
II, preparation of ionic polymer based on tetrafluoro phenyl benzophenone: dissolving 10g of 2,3,5, 6-tetrafluoro-1, 4-bis (chloromethyl) benzene and 13.1g of tetraethyl ketone in 110g of N, N-dimethylformamide, stirring and reacting at 65 ℃ for 16.5 hours, then precipitating in ethanol, washing the precipitated polymer with diethyl ether for 4 times, then removing the diethyl ether by rotary evaporation, and placing in a vacuum drying oven at 53 ℃ to dry to constant weight;
III, surface modification of fluorinated graphene: dispersing 35g of graphene fluoride in 122g of acetonitrile, adding 5g of trimethoxy [2- (7-oxabicyclo [4.1.0] hept-3-yl) ethyl ] silane, stirring and reacting at 65 ℃ for 10.5 hours, then performing rotary evaporation to remove the solvent, washing with water for 4 times, and then placing in a vacuum drying oven to dry at 83 ℃ to constant weight;
IV, preparation of a film: dispersing 1.3g of the surface-modified fluorinated graphene prepared in the step III in 215g of N, N-dimethylformamide, adding 10g of the acrylic acid grafted high-density polyethylene prepared in the step I and 5g of the ionic polymer based on tetrafluorobenzyl ketone prepared in the step II, uniformly mixing, and pouring at 78 ℃ to form a film, thereby obtaining the isolation film for soil remediation.
An isolation tectorial membrane for soil restoration is prepared according to the preparation method of the isolation tectorial membrane for soil restoration.
Example 3
A preparation method of an isolation tectorial membrane for soil remediation comprises the following steps:
i high-density polyethylene grafted acrylic acid: uniformly mixing 40g of high-density polyethylene, 5g of acrylic acid, 5g of acrylonitrile and 0.16g of sodium persulfate in advance, adding the mixture into a rheometer, and carrying out melt mixing grafting under the conditions that the temperature is 185 ℃ and the rotating speed is 35rmp, wherein the reaction time is 25 minutes, so as to obtain acrylic acid grafted high-density polyethylene;
II, preparation of ionic polymer based on tetrafluoro phenyl benzophenone: dissolving 10g of 2,3,5, 6-tetrafluoro-1, 4-bis (chloromethyl) benzene and 13.1g of tetraethyl mikrolon in 130g of N-methylpyrrolidone, stirring and reacting at 70 ℃ for 17.5 hours, then separating out in ethanol, washing the separated polymer with diethyl ether for 4 times, then removing the diethyl ether by rotary evaporation, and placing in a vacuum drying oven at 55 ℃ to dry to constant weight;
III, surface modification of fluorinated graphene: dispersing 40g of fluorinated graphene in 135g of tetrahydrofuran, adding 5g of trimethoxy [2- (7-oxabicyclo [4.1.0] hept-3-yl) ethyl ] silane, stirring and reacting at 70 ℃ for 11 hours, then performing rotary evaporation to remove the solvent, washing with water for 4 times, and then placing in a vacuum drying oven to be dried to constant weight at 85 ℃;
IV, preparation of a film: dispersing 1.7g of the surface-modified fluorinated graphene prepared in the step III in 230g of N, N-dimethylformamide, adding 10g of the acrylic acid grafted high-density polyethylene prepared in the step I and 5g of the ionic polymer based on tetrafluorobenzyl ketone prepared in the step II, uniformly mixing, and pouring at 80 ℃ to form a film, thereby obtaining the isolation film for soil remediation.
An isolation tectorial membrane for soil restoration is prepared according to the preparation method of the isolation tectorial membrane for soil restoration.
Example 4
A preparation method of an isolation tectorial membrane for soil remediation comprises the following steps:
i high-density polyethylene grafted acrylic acid: uniformly mixing 45g of high-density polyethylene, 5g of acrylic acid, 5g of acrylonitrile and 0.19g of initiator in advance, adding the mixture into a rheometer, and carrying out melt mixing grafting under the conditions that the temperature is 188 ℃ and the rotating speed is 38rmp, wherein the reaction time is 29 minutes, so as to obtain acrylic acid grafted high-density polyethylene; the initiator is a mixture formed by mixing azodiisobutyronitrile, azodiisoheptonitrile and sodium persulfate according to the mass ratio of 2:1: 1;
II, preparation of ionic polymer based on tetrafluoro phenyl benzophenone: dissolving 10g of 2,3,5, 6-tetrafluoro-1, 4-bis (chloromethyl) benzene and 13.1g of tetraethyl mesitone in 143g of a high-boiling-point solvent, stirring and reacting at 75 ℃ for 19 hours, then precipitating in ethanol, washing the precipitated polymer with diethyl ether for 5 times, then removing the diethyl ether by rotary evaporation, and placing in a vacuum drying oven at 58 ℃ to dry to constant weight; the high-boiling-point solvent is a mixture formed by mixing dimethyl sulfoxide, N-dimethylformamide and N-methylpyrrolidone according to a mass ratio of 3:2: 5;
III, surface modification of fluorinated graphene: dispersing 45g of fluorinated graphene in 145g of organic solvent, adding 5g of trimethoxy [2- (7-oxabicyclo [4.1.0] hept-3-yl) ethyl ] silane, stirring and reacting at 78 ℃ for 11.5 hours, then performing rotary evaporation to remove the solvent, washing with water for 5 times, and then placing in a vacuum drying oven to be dried to constant weight at 88 ℃; the organic solvent is a mixture formed by mixing ethanol, acetonitrile and tetrahydrofuran according to the mass ratio of 2:2: 1;
IV, preparation of a film: dispersing 1.9g of the surface-modified fluorinated graphene prepared in the step III in 245g of N, N-dimethylformamide, adding 10g of the acrylic acid grafted high-density polyethylene prepared in the step I and 5g of the ionic polymer based on tetrafluorobenzyl ketone prepared in the step II, uniformly mixing, and pouring at 83 ℃ to form a film, thereby obtaining the isolation covering film for soil remediation.
An isolation tectorial membrane for soil restoration is prepared according to the preparation method of the isolation tectorial membrane for soil restoration.
Example 5
A preparation method of an isolation tectorial membrane for soil remediation comprises the following steps:
i high-density polyethylene grafted acrylic acid: uniformly mixing 50g of high-density polyethylene, 5g of acrylic acid, 5g of acrylonitrile and 0.2g of azobisisobutyronitrile in advance, adding the mixture into a rheometer, and carrying out melt mixing grafting under the conditions that the temperature is 190 ℃ and the rotating speed is 40rmp, wherein the reaction time is 30 minutes to obtain acrylic acid grafted high-density polyethylene;
II, preparation of ionic polymer based on tetrafluoro phenyl benzophenone: dissolving 10g of 2,3,5, 6-tetrafluoro-1, 4-bis (chloromethyl) benzene and 13.1g of tetraethyl ketone in 150g of N, N-dimethylformamide, stirring and reacting at 80 ℃ for 20 hours, then precipitating in ethanol, washing the precipitated polymer with diethyl ether for 5 times, then carrying out rotary evaporation to remove the diethyl ether, and placing in a vacuum drying oven at 60 ℃ to dry to constant weight;
III, surface modification of fluorinated graphene: dispersing 50g of fluorinated graphene in 150g of acetonitrile, adding 5g of trimethoxy [2- (7-oxabicyclo [4.1.0] hept-3-yl) ethyl ] silane, stirring and reacting at 80 ℃ for 12 hours, then performing rotary evaporation to remove the solvent, washing with water for 5 times, and then placing in a vacuum drying oven to dry at 90 ℃ until the weight is constant;
IV, preparation of a film: dispersing 2g of the surface-modified fluorinated graphene prepared in the step III in 250g of N, N-dimethylformamide, adding 10g of the acrylic acid grafted high-density polyethylene prepared in the step I and 5g of the ionic polymer based on tetrafluorobenzyl ketone prepared in the step II, uniformly mixing, and pouring at 85 ℃ to form a film, thereby obtaining the isolation covering film for soil remediation.
An isolation tectorial membrane for soil restoration is prepared according to the preparation method of the isolation tectorial membrane for soil restoration.
Comparative example
The present invention provides a geomembrane, the formulation and the preparation method thereof are the same as those in embodiment 1 of the invention patent CN 101525452B in China.
The performance tests of the barrier film prepared in examples 1 to 5 and the geomembrane prepared in the comparative example were performed, and the test methods and test results are shown in table 1.
TABLE 1
As can be seen from table 1, the isolation cover film for soil remediation disclosed in the embodiment of the present invention has more excellent permeation resistance and mechanical properties than the geomembrane in the prior art.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A preparation method of an isolation tectorial membrane for soil restoration is characterized by comprising the following steps:
i high-density polyethylene grafted acrylic acid: uniformly mixing high-density polyethylene, acrylic acid, acrylonitrile and an initiator in advance, adding the mixture into a rheometer, and carrying out melt mixing grafting under the conditions that the temperature is 180 ℃ and 190 ℃ and the rotating speed is 30-40rmp, wherein the reaction time is 20-30 minutes, so as to obtain acrylic acid grafted high-density polyethylene; the mass ratio of the high-density polyethylene to the acrylic acid to the acrylonitrile to the initiator is (3-5) to 0.5 (0.01-0.02);
II, preparation of ionic polymer based on tetrafluoro phenyl benzophenone: dissolving 2,3,5, 6-tetrafluoro-1, 4-bis (chloromethyl) benzene and tetraethyl mikrolon in a high-boiling point solvent, stirring and reacting for 15-20 hours at 60-80 ℃, then separating out in ethanol, washing the separated out polymer with diethyl ether for 3-5 times, then removing the diethyl ether by rotary evaporation, and placing in a vacuum drying oven at 50-60 ℃ to dry to constant weight; the mass ratio of the 2,3,5, 6-tetrafluoro-1, 4-bis (chloromethyl) benzene, tetraethyl mikrolon and the high-boiling-point solvent is 1:1.31 (10-15);
III, surface modification of fluorinated graphene: dispersing fluorinated graphene in an organic solvent, adding trimethoxy [2- (7-oxabicyclo [4.1.0] hept-3-yl) ethyl ] silane, stirring and reacting at 60-80 ℃ for 10-12 hours, then performing rotary evaporation to remove the solvent, washing with water for 3-5 times, and then placing in a vacuum drying oven to be dried to constant weight at 80-90 ℃; the mass ratio of the fluorinated graphene to the organic solvent to the trimethoxy [2- (7-oxabicyclo [4.1.0] hept-3-yl) ethyl ] silane is (3-5):0.5 (10-15);
IV, preparation of a film: dispersing the surface modified fluorinated graphene prepared in the step III in N, N-dimethylformamide, adding the acrylic acid grafted high-density polyethylene prepared in the step I and the ionic polymer based on the tetrafluoro phenyl benzophenone prepared in the step II, uniformly mixing, and pouring at 75-85 ℃ to form a film to obtain an isolation covering film for soil remediation; the mass ratio of the surface modified fluorinated graphene to the N, N-dimethylformamide to the acrylic acid grafted high-density polyethylene to the tetrafluorobenzophenones-based ionic polymer is (0.1-0.2) to (20-25) to 1: 0.5.
2. The method for preparing a soil remediation barrier coating as claimed in claim 1, wherein the initiator is one or more selected from azobisisobutyronitrile, azobisisoheptonitrile and sodium persulfate.
3. The method for preparing a soil remediation barrier film according to claim 1, wherein the high boiling point solvent is one or more selected from the group consisting of dimethylsulfoxide, N-dimethylformamide, and N-methylpyrrolidone.
4. The method for preparing a soil remediation isolation cover film according to claim 1, wherein the organic solvent is one or more selected from ethanol, acetonitrile, and tetrahydrofuran.
5. A soil restoration isolation cover film produced by the method for producing a soil restoration isolation cover film according to any one of claims 1 to 4.
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Inventor after: Chen Jieyu Inventor after: Luo Chunhui Inventor after: Xu Jiali Inventor after: Bao Keke Inventor before: Bao Keke |
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Effective date of registration: 20210902 Address after: 310000 floor 10, building 3, No. 1795, Tongwen Road, Qiaonan block, Xiaoshan District, Hangzhou City, Zhejiang Province Applicant after: Hangzhou Yirang Environmental Technology Group Co.,Ltd. Address before: 315000 Ningbo Software Park, 750 Chuangyuan Road, high tech Zone, Ningbo City, Zhejiang Province Applicant before: Bao Keke |
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Denomination of invention: Isolation film for soil remediation and its preparation method Effective date of registration: 20230512 Granted publication date: 20210917 Pledgee: Xiaoshan sub branch of Hangzhou United Rural Commercial Bank Co.,Ltd. Pledgor: Hangzhou Yirang Environmental Technology Group Co.,Ltd. Registration number: Y2023980040443 |
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