A hydrophobic and oleophobic paper-based film material and a preparation method and application thereof

Abstract

The application discloses a kind of preparation methods of hydrophobic and oleophobic paper-based film material, comprising the following steps: cellulose fiber is beaten into shape and cellulose paper is prepared;Acrylic acid is mixed with water to prepare an acrylic acid solution, sodium hypophosphite is added to the acrylic acid solution and mixed to obtain an acrylic acid modified solution;Octa-phenylamino cage-type silsesquioxane tetrahydrofuran solution is prepared;Cellulose paper is soaked in the acrylic acid modified solution, then transferred to an oven, after surface esterification grafting reaction, the residual liquid of cellulose paper is cleaned;Cellulose paper is immersed in octa-phenylamino cage-type silsesquioxane tetrahydrofuran solution, and grafting crosslinking reaction is carried out;The residual liquid of cellulose paper is cleaned, and then dried to obtain a hydrophobic and oleophobic paper-based film.The paper-based film material prepared by the application has excellent hydrophobicity and oleophobicity, overcomes the problem of poor durability of conventional paper-based materials, and can be applied to membrane distillation and membrane separation technical field.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of membrane separation technology, and particularly relates to a hydrophobic and oleophobic paper-based membrane material and a preparation method and application thereof. BACKGROUND

[0002] Cellulose is a kind of natural polymer material widely existing in nature, has the advantages of being renewable and biodegradable, and is considered to be an ideal composite material substrate. The hydrophilic oil-water separation membrane constructed by using plant fibers as a substrate has the advantages of low cost, high efficiency, good applicability and no secondary pollution. Paper is a porous network structure material formed by interweaving fibers, and a layered porous structure is formed during the preparation process, which is suitable for use as a substrate for a separation membrane. The paper-based membrane material has good air permeability, and the hydrophilic and oleophobic property commonly exhibited can also be applied to the field of membrane separation and has certain application in oil-water separation. However, plant fiber paper also has strong hydrophilicity, and the strength decreases significantly after water absorption, and the low wet strength and poor wear resistance seriously limit its application. At present, there are many studies on the hydrophobic modification of cellulose, mainly including surface modification and surface coating.

[0003] A Chinese patent with the application number CN202010402183.5 discloses a preparation method of super-hydrophobic paper, which comprises the following steps: step one, ultrasonic emulsification of octadecylamine to obtain an octadecylamine emulsion; step two, uniformly mixing the octadecylamine emulsion with paper pulp in proportion to form an octadecylamine paper pulp mixture; step three, adding tannic acid and aluminum chloride hexahydrate to the octadecylamine paper pulp mixture, adjusting the pH, and stirring to form a tannic acid@octadecylamine microcapsule modified paper fiber slurry; and step four, centrifuging, flattening and drying the paper fiber slurry to obtain the super-hydrophobic paper. Compared with the traditional method, the present application does not require complex instruments and equipment, does not require a complex synthesis process, and does not require a long time, and has the advantages of simple operation, convenience, environmental protection, etc., and the prepared super-hydrophobic paper has good super-hydrophobic performance, good durability and self-repairing performance. A Chinese patent with the application number CN200710055835.7 discloses a preparation method of super-hydrophobic cotton fiber material or super-hydrophobic paper fiber material and the use of the super-hydrophobic cotton fiber material or super-hydrophobic paper fiber material prepared by the method. The present application uses environmentally friendly and low-cost silicon material to modify cellulose and prepare cellulose-based material with super-hydrophobic performance. In the present application, the silicon material is a methylsilicate sodium or potassium solution or chlorosilane. The cellulose material treated with the silicon material exhibits good super-hydrophobic performance and air permeability. However, the above patents only modify the surface hydrophobicity of the cellulose paper, and do not consider maintaining the oleophobicity of the paper.

[0004] Chinese patent application No. CN201010514679.8 discloses a method for preparing a dual-repellent natural cellulose material. The method uses a natural cellulose material etched by sodium hydroxide solution as a substrate, and titanium tetrabutoxide as a precursor. A titanium dioxide film is deposited on the surface of the filter paper fiber by a sol-gel method. Then, a low-surface-energy perfluorosiloxane monolayer is introduced by self-assembly to obtain a dual-repellent cellulose material with hydrophobic and oleophobic properties. However, the application only increases the dual-repellent property of the material by changing the roughness of the material surface, and it is difficult to make the material have both hydrophobic and oleophobic properties. In addition, the durability of the material is poor. SUMMARY

[0005] To solve the above problems, the present application provides a hydrophobic and oleophobic paper-based membrane material and its preparation method and application. By using surface modification strategy, the hydrophobic and oleophobic paper-based membrane material with good hydrophobicity, oleophobicity and durability is prepared.

[0006] The technical scheme of the present application is as follows:

[0007] One of the objects of the present application is to provide a preparation method of a hydrophobic and oleophobic paper-based membrane material, comprising the following steps:

[0008] S1: beating and forming natural cellulose fibers to obtain cellulose paper for standby;

[0009] S2: mixing acrylic acid and deionized water to obtain an acrylic acid solution, adding sodium hypophosphite catalyst to the acrylic acid solution and mixing uniformly to obtain an acrylic acid modified solution for standby;

[0010] S3: dissolving octa-phenylamino cage-type silsesquioxane in tetrahydrofuran to make it completely dissolved, and preparing an octa-phenylamino cage-type silsesquioxane tetrahydrofuran solution for standby;

[0011] S4: soaking the cellulose paper prepared in step S1 in the acrylic acid modified solution prepared in step S2, and then transferring the cellulose paper to an oven to make the cellulose paper and the acrylic acid modified solution undergo surface esterification grafting reaction, and then cleaning the residual solution of the cellulose paper;

[0012] S5: immersing the cellulose paper after esterification grafting reaction in step S4 in the octa-phenylamino cage-type silsesquioxane tetrahydrofuran solution prepared in step S3 to perform grafting crosslinking reaction;

[0013] S6: cleaning the residual solution of the cellulose paper treated in step S5 until the pH of the washing solution is neutral, and then drying the cleaned cellulose paper to obtain a hydrophobic and oleophobic paper-based membrane.

[0014] Further, the step S1 is specifically: soaking the natural cellulose fibers in distilled water to make them fully dispersed, drying them in an oven, then configuring them into 10wt% thick pulp, adjusting the beating degree to 40°SR-60°SR using a PFI mill, and using a former to prepare paper with a basis weight of 60g / m 2 After drying and cutting, the cellulose paper is prepared.

[0015] Further, in the step S1, the temperature of the oven is 80-110℃, and the drying treatment time is 10-20min.

[0016] Further, in the step S2, the mass ratio of the acrylic acid to the sodium hypophosphite catalyst is 2:1.

[0017] Further, in the step S4, the soaking time of the cellulose paper is 2-5h, the temperature of the oven is 120-180℃, and the reaction time is 2h.

[0018] Further, in the step S5, the temperature of the grafting cross-linking reaction is 40-50℃, and the reaction time is 10-15h.

[0019] Further, in the step S5, triethylamine is also added as a reaction catalyst.

[0020] Further, in the step S6, the temperature of the drying treatment is 80-110℃, and the time is 1-2h.

[0021] The second object of the present application is to provide a hydrophobic and oleophobic paper-based film material prepared according to any of the above preparation methods.

[0022] The third object of the present application is to provide a use of the hydrophobic and oleophobic paper-based film material in the membrane distillation treatment of oil-containing and organic wastewater.

[0023] Compared with the prior art, the present application has the following beneficial effects:

[0024] 1. The application provides a kind of hydrophobic and oleophobic paper-based film material preparation method, first using acrylic acid as coupling agent to improve the connection performance of cellulose surface, compared with other silane coupling agent, acrylic acid can leave double bond functional group on cellulose surface, provide reaction anchor point for the high modification potential of octa-phenylamino cage-type silsesquioxane;Then using octa-phenylamino cage-type silsesquioxane is grafted and crosslinked by amine-ene michael addition reaction to cellulose paper, octa-phenylamino cage-type silsesquioxane with multiple phenylamino connects the reaction anchor point on the surface of different cellulose fibers, the addition of octa-phenylamino cage-type silsesquioxane not only can utilize its huge molecular space to reduce the contact area of water and matrix, but also can improve the crosslinking degree of cellulose, to improve the mechanical strength of cellulose paper.The modification process of acrylic acid and octa-phenylamino cage-type silsesquioxane used in the application to cellulose paper will not affect the pore size and porosity of paper, and no lipophilic group is introduced, therefore, compared with unmodified cellulose paper, the paper-based film after surface grafting and crosslinking modification not only retains its good oleophobicity and air permeability, but also obtains good hydrophobicity.

[0025] 2. In the application, by controlling the beating degree to be 40°SR-60°SR, the bonding force between fibers can be increased, thereby improving the tensile strength and durability of the paper-based film, and the voids between fibers of the paper-based film can be reduced, further improving the hydrophobicity of the paper-based film.

[0026] 3. The hydrophobic and oleophobic paper-based film material provided by the application retains the excellent air permeability and oleophobicity of the paper-based film, and also has good hydrophobicity, overcoming the poor durability problem of conventional paper-based materials.

[0027] 4. The application of the hydrophobic and oleophobic paper-based film material provided by the application, since the hydrophobic and oleophobic paper-based film prepared by the application has excellent air permeability, good hydrophobicity and oleophobicity, it can be applied to the fields of membrane distillation and membrane separation. BRIEF DESCRIPTION OF DRAWINGS

[0028] Fig. 1 The flow chart of the hydrophobic and oleophobic paper-based film material provided by the application is shown in the figure.

[0029] Fig. 2 The structure diagram of cellulose modified by acrylic acid and octa-phenylamino cage-type silsesquioxane is shown in the figure.

[0030] Fig. 3 The structure diagram of octa-phenylamino cage-type silsesquioxane in the application is shown in the figure. DETAILED DESCRIPTION

[0031] The preferred embodiments will be described below, and the accompanying drawings will be referred to. Figs. 1-3Further, the endpoints of the ranges and any values disclosed herein are not limited to the precise values. The endpoints of the ranges and any values are provided as a separate embodiment. The ranges include values which are approximately the same as that of the range limits. The ranges include endpoints between the range limits. The ranges include single values between the endpoints. The application is therefore to be understood in accordance with the following description, taken in conjunction with the appended claims, and appended drawings.

[0032] Example 1

[0033] The embodiment provides a preparation method of a hydrophobic and oleophobic paper-based film material, comprising the following steps:

[0034] S1: soaking natural cellulose fibers in distilled water to fully disperse them, drying them in an oven, then configuring a 10wt% thick stock, using a PFI mill to adjust the beating degree to 60°SR, and using a former to prepare paper with a basis weight of 60g / m 2 2.5g sodium hypophosphite catalyst, mixing them uniformly to obtain a 10wt% acrylic acid modified solution, and ultrasonically treating them for 30min until fully mixed and uniform, for standby;

[0035] S2: mixing 5g of acrylic acid with 42.5ml of deionized water to obtain an acrylic acid solution, adding 2.5g of sodium hypophosphite catalyst to the acrylic acid solution, mixing them uniformly to obtain a 10wt% acrylic acid modified solution, and ultrasonically treating them for 30min until fully mixed and uniform, for standby;

[0036] S3: dissolving 2g of octa-phenylamino cage-type silsesquioxane in 20ml of tetrahydrofuran, ultrasonically treating them for 30min until fully dissolved, and configuring to obtain a tetrahydrofuran solution of octa-phenylamino cage-type silsesquioxane, for standby;

[0037] S4: soaking the cellulose paper prepared in step S1 in the acrylic acid modified solution configured in step S2 for 3h, so that the cellulose paper fully absorbs the acrylic acid modified solution, then transferring the cellulose paper to a 150°C oven to perform an esterification grafting reaction, the reaction time being 2h, and cleaning the residual solution of the cellulose paper;

[0038] S5: immersing the cellulose paper after the esterification grafting reaction in step S4 in the tetrahydrofuran solution containing octa-phenylamino cage-type silsesquioxane configured in step S3, reacting them at 50°C for 10h, and adding triethylamine as a catalyst dropwise to perform a grafting crosslinking reaction;

[0039] S6: The residual liquid of the cellulose paper treated in step S5 is washed until the pH of the washing liquid is neutral, and then the washed cellulose paper is placed in an oven at 110°C for 1 h to obtain a hydrophobic and oleophobic paper-based film.

[0040] The embodiment also provides a hydrophobic and oleophobic paper-based film material prepared according to the method.

[0041] The embodiment also provides an application of the hydrophobic and oleophobic paper-based film material, which is applied to the membrane distillation treatment of oil-containing and organic wastewater.

[0042] Embodiment 2

[0043] The embodiment provides a preparation method of a hydrophobic and oleophobic paper-based film material, which comprises the following steps:

[0044] S1: Natural cellulose fibers are soaked in distilled water to be fully dispersed, dried in an oven, prepared into a 10wt% thick stock, adjusted to a beating degree of 40°SR using a PFI mill, and prepared into a paper sheet with a basis weight of 60g / m 2 using a former, dried in an oven at 110°C for 15 min, and cut into a size of 6cm*6cm for standby;

[0045] S2: 5g of acrylic acid is mixed with 17.5ml of deionized water to obtain an acrylic acid solution, 2.5g of sodium hypophosphite catalyst is added into the acrylic acid solution, mixed uniformly, and obtained is a 20wt% acrylic acid modified solution, which is ultrasonically treated for 30 min until fully mixed and uniform, and standby;

[0046] S3: 1g of octa-phenylamino cage-type silsesquioxane is dissolved in 20ml of tetrahydrofuran, stirred at a high speed for 20 min until fully dissolved, and obtained is a tetrahydrofuran solution of octa-phenylamino cage-type silsesquioxane, which is standby;

[0047] S4: The cellulose paper prepared in step S1 is soaked in the acrylic acid modified solution prepared in step S2 for 2h, so that the cellulose paper fully absorbs the acrylic acid modified solution, and then the cellulose paper is transferred to an oven at 180°C for esterification grafting reaction, the reaction time is 2h, and the residual liquid of the cellulose paper is washed;

[0048] S5: The cellulose paper after the esterification grafting reaction in step S4 is immersed in the tetrahydrofuran solution containing octa-phenylamino cage-type silsesquioxane prepared in step S3, reacted at 40°C for 15h, and triethylamine is added dropwise as a catalyst to perform grafting crosslinking reaction;

[0049] S6: The residual liquid of the cellulose paper treated in step S5 is washed until the pH of the washing liquid is neutral, and then the cellulose paper is placed in an oven at 100°C for 1.5h to obtain a hydrophobic and oleophobic paper-based film.

[0050] The embodiment also provides a hydrophobic and oleophobic paper-based film material prepared according to the method.

[0051] The embodiment also provides an application of the hydrophobic and oleophobic paper-based film material, which is applied to membrane distillation treatment of oil-containing and organic wastewater.

[0052] Embodiment 3

[0053] The embodiment provides a preparation method of a hydrophobic and oleophobic paper-based film material, including the following steps.

[0054] S1: natural cellulose fibers are soaked in distilled water to be fully dispersed, dried in an oven, configured into 10wt% thick stock, adjusted to 50°SR by using a PFI mill, and prepared into paper with a basis weight of 60g / m 2 2 by using a former, dried in an oven at 80℃ for 20min, and cut into a size of 7cm*7cm for standby;

[0055] S2: 5g of acrylic acid is mixed with 92.5ml of deionized water to obtain an acrylic acid solution, 2.5g of sodium hypophosphite catalyst is added into the acrylic acid solution, mixed uniformly, and obtained is 5wt% of an acrylic acid modified solution, which is ultrasonically treated for 15min until fully mixed and uniform, and standby;

[0056] S3: 2.5g of octa-phenylamino cage-type silsesquioxane is dissolved in 20ml of tetrahydrofuran, ultrasonically treated for 25min until fully dissolved, and obtained is a tetrahydrofuran solution of octa-phenylamino cage-type silsesquioxane, which is standby;

[0057] S4: the cellulose paper obtained in step S1 is soaked in the acrylic acid modified solution obtained in step S2 for 5h, so that the cellulose paper fully absorbs the acrylic acid modified solution, and then the cellulose paper is transferred to a 120℃ oven for esterification grafting reaction, the reaction lasts for 2h, and the residual liquid of the cellulose paper is cleaned;

[0058] S5: the cellulose paper after the esterification grafting reaction in step S4 is immersed in the tetrahydrofuran solution containing octa-phenylamino cage-type silsesquioxane obtained in step S3, reacts at 45℃ for 12h, and triethylamine is added dropwise as a catalyst to perform grafting crosslinking reaction;

[0059] S6: the residual liquid of the cellulose paper treated in step S5 is cleaned until the pH of the washing liquid is neutral, and then the cleaned cellulose paper is placed in an 80℃ oven for 2h to obtain a hydrophobic and oleophobic paper-based film.

[0060] The embodiment also provides a hydrophobic and oleophobic paper-based film material prepared according to the method.

[0061] The embodiment further provides an application of the hydrophobic and oleophobic paper-based film material, and the hydrophobic and oleophobic paper-based film material is applied to membrane distillation treatment of oil-containing and organic-containing wastewater.

[0062] Embodiment 4

[0063] The embodiment provides a preparation method of a hydrophobic and oleophobic paper-based film material, which is basically the same as that of the embodiment 1, and the difference is that:

[0064] In step S1, the beating degree is adjusted to 50°SR by using a PFI mill.

[0065] The embodiment further provides a hydrophobic and oleophobic paper-based film material prepared according to the above method.

[0066] The embodiment further provides an application of the hydrophobic and oleophobic paper-based film material, and the hydrophobic and oleophobic paper-based film material is applied to membrane distillation treatment of oil-containing and organic-containing wastewater.

[0067] Embodiment 5

[0068] The embodiment provides a preparation method of a hydrophobic and oleophobic paper-based film material, which is basically the same as that of the embodiment 1, and the difference is that:

[0069] In step S3, 3 g of octa-phenylamino cage silsesquioxane is dissolved in 20 ml of tetrahydrofuran.

[0070] The embodiment further provides a hydrophobic and oleophobic paper-based film material prepared according to the above method.

[0071] The embodiment further provides an application of the hydrophobic and oleophobic paper-based film material, and the hydrophobic and oleophobic paper-based film material is applied to membrane distillation treatment of oil-containing and organic-containing wastewater.

[0072] Comparative Example 1

[0073] The difference from the embodiment 1 is that the cellulose paper is not modified;

[0074] The preparation method of the hydrophobic and oleophobic paper-based film material comprises the following steps:

[0075] The natural cellulose fibers are soaked in distilled water to be fully dispersed, dried in an oven, and then configured into 50 g of 10 wt% thick stock. A PFI mill is used to adjust the beating degree to 60°SR, and a former is used to prepare paper with a basis weight of 60 g / m 2 The paper is dried in an oven at 100℃ for 10 min, and cut into a size of 5 cm*5 cm to obtain the hydrophobic and oleophobic paper-based film.

[0076] Comparative Example 2

[0077] The difference from Example 1 is that the cellulose paper is not treated by acrylic modification;

[0078] The preparation method of the hydrophobic and oleophobic paper base film material comprises the following steps:

[0079] S1: The natural cellulose fibers are soaked in distilled water to make them fully dispersed, dried in an oven, then configured into 10wt% thick pulp, the beating degree is adjusted to 60°SR using a PFI mill, and a former is used to prepare paper with a basis weight of 60g / m 2 The paper is dried in an oven at 100℃ for 10min, and cut into a size of 5cm*5cm for standby;

[0080] S2: 2g of octa-phenyl aminosilsequioxane is dissolved in 20ml of tetrahydrofuran, and ultrasonic treatment is performed for 30min to make it fully dissolved, to obtain an octa-phenyl aminosilsequioxane tetrahydrofuran solution, which is used for standby;

[0081] S3: The cellulose paper prepared in step S1 is immersed in the octa-phenyl aminosilsequioxane tetrahydrofuran solution prepared in step S2, and a grafting and crosslinking reaction is performed at 50℃ for 10h, with dropwise addition of triethylamine as a catalyst;

[0082] S4: The residual liquid of the cellulose paper treated in step S3 is washed until the washing liquid is neutral, and then the washed cellulose paper is placed in an oven at 110℃ for 1h to obtain a hydrophobic and oleophobic paper base film.

[0083] Comparative Example 3

[0084] The difference from Example 1 is that the cellulose paper is not treated by octa-phenyl aminosilsequioxane modification;

[0085] The preparation method of the hydrophobic and oleophobic paper base film material comprises the following steps:

[0086] S1: The natural cellulose fibers are soaked in distilled water to make them fully dispersed, dried in an oven, then configured into 10wt% thick pulp, the beating degree is adjusted to 60°SR using a PFI mill, and a former is used to prepare paper with a basis weight of 60g / m 2 The paper is dried in an oven at 100℃ for 10min, and cut into a size of 5cm*5cm for standby;

[0087] S2: 5g of acrylic acid is mixed with 42.5ml of deionized water to prepare an acrylic acid solution, 2.5g of sodium hypophosphite catalyst is added to the acrylic acid solution, and mixed uniformly to obtain a 10wt% acrylic acid modified solution, which is ultrasonic treated for 30min until fully mixed and uniform, and used for standby;

[0088] S3: The cellulose paper prepared in step S1 is soaked in the acrylic modified solution prepared in step S2 for 3h, so that the cellulose paper fully absorbs the acrylic modified solution, and then the cellulose paper is transferred to an oven at 150℃ for esterification grafting reaction, the reaction time is 2h, and the residual solution of the cellulose paper is cleaned;

[0089] S4: The cellulose paper cleaned in step S3 is placed in an oven at 110℃ for 1h to obtain a hydrophobic and oleophobic paper-based film.

[0090] Effect evaluation

[0091] The excellent effects achieved by the present application are further illustrated by specific tests on the hydrophobic and oleophobic paper-based film materials prepared in Examples 1-5 and Comparative Examples 1-3:

[0092] Water contact angle test:

[0093] The water contact angle and oil contact angle of the obtained paper-based film material are measured by an optical contact angle measuring instrument, the droplet size is set to 3μL, the droplet is first moved out to the film material to be tested placed on the workbench of the contact angle measuring instrument by a syringe, the image is recorded and analyzed, and each test is repeated 5 times;

[0094] Tensile strength test:

[0095] According to the relevant standards of GB / T 12914-2008, the tensile properties of the hydrophobic and oleophobic paper-based film materials prepared in Examples 1-5 and Comparative Examples 1-3 are evaluated;

[0096] According to the relevant standards of GB / T 465.2-2008, the wet tensile properties of the hydrophobic and oleophobic paper-based film materials prepared in Comparative Examples 1-3 are evaluated

[0097] The test results are shown in Table 1:

[0098] Table 1 Test result statistics

[0099]

[0100] From the above table, it can be seen that the preparation method of the hydrophobic and oleophobic paper-based film material provided by the present application has good hydrophobicity and oleophobicity, the dry paper mechanical strength is slightly improved, and the hydrophobicity avoids the significant decrease in strength caused by immersion and water absorption, and the air permeability is good.

[0101] From the test results of Example 1 and Comparative Examples 1-3, it can be seen that, by using acrylic acid as a coupling agent to improve the connection performance of the surface of cellulose first, and then using octa-phenylamino cage-type silsesquioxane to graft and crosslink the cellulose paper through amine-ene Michael addition reaction, the surface of the cellulose paper retains good oil-repellent and air permeability while the hydrophobic performance is greatly improved, so that the prepared paper-based membrane can be suitable for membrane distillation treatment of oil-containing and organic wastewater.

[0102] The above merely describes the preferred embodiments of the present application, and it should be noted that, for those skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are all within the protection scope of the present application.

Claims

1. A method of making a hydrophobic and oleophobic paper-based film material, characterized by, It comprises the following steps: S1: the natural cellulose fiber is pulped into a shape to prepare a cellulose paper, ready for use; S2: acrylic acid is mixed with deionized water to prepare an acrylic acid solution, and sodium hypophosphite catalyst is added to the acrylic acid solution, mixed uniformly to obtain an acrylic acid modified solution, ready for use; S3: octa-phenylamino cage-type silsesquioxane is dissolved in tetrahydrofuran to make it completely dissolved, and an octa-phenylamino cage-type silsesquioxane tetrahydrofuran solution is prepared, ready for use; S4: the cellulose paper prepared in step S1 is soaked in the acrylic acid modified solution prepared in step S2, and then the cellulose paper is transferred to an oven, so that the cellulose paper and the acrylic acid modified solution undergo surface esterification grafting reaction, and the residual solution of the cellulose paper is cleaned; S5: the cellulose paper after esterification grafting reaction in step S4 is immersed in the octa-phenylamino cage-type silsesquioxane tetrahydrofuran solution prepared in step S3 to perform grafting crosslinking reaction; S6: the residual solution of the cellulose paper treated in step S5 is cleaned until the pH of the washing solution is neutral, and the cleaned cellulose paper is dried to obtain a hydrophobic and oleophobic paper-based film.

2. The method of claim 1, wherein the paper-based film material is hydrophobic and oleophobic. Step S1 is specifically: soaking natural cellulose fibers in distilled water to make them fully dispersed, drying in an oven, then configuring into 10 wt% thick stock, using PFI mill to adjust the beating degree to 40°SR-60°SR, and using a former to prepare paper with a basis weight of 60 g / m 2 After drying and cutting, cellulose paper is prepared.

3. The method for preparing a hydrophobic and oleophobic paper-based film material according to claim 2, characterized in that, In step S1, the temperature of the oven is 80-110℃, and the drying treatment time is 10-20min.

4. The method of claim 1, wherein the paper-based film material is hydrophobic and oleophobic. In step S2, the mass ratio of acrylic acid to sodium hypophosphite catalyst is 2:

1.

5. The method of claim 1, wherein the paper-based film material is hydrophobic and oleophobic. In step S4, the soaking time of the cellulose paper is 2-5h, and the temperature of the oven is 120-180℃, The reaction time is 2h.

6. The method of claim 1, wherein the paper-based film material is hydrophobic and oleophobic. In step S5, the grafting crosslinking reaction temperature is 40-50℃, and the reaction time is 10-15h.

7. The method of claim 1, wherein the paper-based film material is hydrophobic and oleophobic. In step S5, triethylamine is also added as a reaction catalyst.

8. The method for preparing a hydrophobic and oleophobic paper-based film material according to claim 1, characterized in that, In step S6, the drying treatment temperature is 80-110℃, and the time is 1-2h.

9. A hydrophobic and oleophobic paper-based film material, characterized by According to any one of claims 1-8.

10. Use of a hydrophobic and oleophobic paper-based film material, characterized in that The hydrophobic and oleophobic paper-based film material prepared by the preparation method of any one of claims 1-8 is applied to membrane distillation treatment of oil-containing and organic wastewater.

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