Preparation method of a high dust capacity filter bag material resistant to deformation

Abstract

The application relates to the technical field of filter materials, and discloses a preparation method of a deformation-resistant high-dust-carrying-capacity filter bag material, which adopts melt spinning composite treatment to composite a skeleton layer, a non-woven fabric filter layer, an electrostatic layer and a non-woven fabric filter layer into the deformation-resistant high-dust-carrying-capacity filter bag material, the method does not use a coating and an adhesive, the skeleton layer is made of modified polypropylene made of modified graphite hollow spheres and polypropylene, the grammage of the prepared skeleton layer is 30-60 g / m 2 , the thickness is 0.4-0.6 mm, and the fiber wire diameter is 40-60 mu m; after the above skeleton layer is composited with the electrostatic layer and the non-woven fabric filter layer, the stiffness of the filter material can be obviously improved, the stiffness test of the deformation-resistant high-dust-carrying-capacity filter bag material can reach 72-83 percent, and the deformation resistance is obviously enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of filter materials, in particular to a preparation method of a deformation-resistant high-dust-carrying capacity filter bag material. BACKGROUND

[0002] The bag filter is a novel filter system with novel structure, small volume, simple and flexible operation, energy saving, high efficiency and strong applicability. The filter bag inside the bag filter is used for intercepting medium to play a filtering role. The filter material of the filter bag usually adopts different filter materials with different filtering efficiency according to different filtering requirements. The commonly used filter materials are fiber fabric and high polymer film.

[0003] It is pointed out in the prior art that the larger the filtering area of the filter bag is, the higher the filtering efficiency is. Therefore, in order to improve the specific surface area of the filter bag in the limited filter, the prior art proposes a technical scheme of a pleated filter, such as a filter bag disclosed in Publication No. CN102196851B, a pleatable filter material of the filter bag and a manufacturing method thereof. Since the material of the pleated filter bag is usually fiber fabric and high polymer film which is easy to deform, part of the material of the filter bag after deformation will be stacked in the process of use, which causes the stacked part to be unable to filter, so that the bag filter cannot be fully guaranteed to filter efficiently. Therefore, in order to solve the above problems, the prior art proposes a method of adding a support skeleton layer to the filter material and using stiffening agent treatment, such as a preparation method of stiffening filter material for pleated filter bag disclosed in Publication No. CN113209726B, and a filter material and its use disclosed in Publication No. CN101934173A. It is found in the use of the present application that the addition of the support skeleton layer to the filter material will increase the thickness and grammage of the filter, which will reduce the specific surface area of the filter bag in the limited filter volume and increase the production cost. When the filter material is treated with stiffening agent, the filter hole of the filter material will be reduced and the filtering performance will be deviated, which will cause the filter material to be unable to meet the use requirements. SUMMARY

[0004] In order to overcome the problems of easy deformation and poor stiffness of the filter bag material in the prior art, the present application provides a preparation method of a deformation-resistant high-dust-carrying capacity filter bag material. The method uses a non-woven process to prepare the filter material, uses a hollow graphene sphere modified polypropylene material to melt blow to synthesize a skeleton layer, and then combines the skeleton layer with a non-woven filter layer and a classic layer to form a deformation-resistant high-dust-carrying filter bag material. The skeleton layer of the method adopts melt blowing to form a three-dimensional fluffy structure formed by polypropylene fibers. The structure has high stiffness, is resistant to deformation and light in weight, which ensures that the filter material will not be stacked due to deformation in the use process of the bag filter, and ensures the efficient operation of the filter.

[0005] The specific technical scheme of the present application is as follows:

[0006] A preparation method of a deformation-resistant high-dust-carrying capacity filter bag material, a skeleton layer is subjected to a skeleton melt-blown composite treatment to the surface of an electrostatic filtration layer to form the deformation-resistant high-dust-carrying capacity filter bag material, the skeleton layer is made of modified polypropylene, the modified polypropylene is made of graphene hollow spheres, a dispersing agent and polypropylene as raw materials through mixing, and the electrostatic filtration layer is made of melt-blown non-woven fabric polyester subjected to a filtration melt-blown composite treatment to the surface of both sides of electrostatic cotton.

[0007] As a preference, the dispersing agent is selected from one or several of dimethyl formamide, sodium lignosulfonate and sodium dodecyl benzene sulfonate.

[0008] As a preference, the graphene hollow spheres are made of a carbon source, a surfactant and a catalyst as raw materials through calcination treatment and acid pickling treatment.

[0009] As a preference, the carbon source is glucose.

[0010] As a preference, the surfactant is one or several of polyvinyl alcohol and polyethylene glycol.

[0011] As a preference, the catalyst is selected from one or several of nickel salt, cobalt salt and iron salt.

[0012] As a preference, the calcination treatment includes one-stage calcination, two-stage calcination and three-stage calcination.

[0013] As a preference, the one-stage calcination includes a temperature of 100-160°C and a time of 5-24 hours.

[0014] As a preference, the two-stage calcination includes a temperature of 300-500°C and a time of 10-30 minutes.

[0015] As a preference, the three-stage calcination includes a nitrogen atmosphere, a temperature of 1000-1100°C and a time of 1-2 hours.

[0016] As a preference, the addition amount of the modified graphene hollow spheres is 0.1-1%.

[0017] As a preference, the mixing includes a feeding section temperature of 110-120°C, a conveying section temperature of 125-135°C, a melting section temperature of 135-145°C and an extruding section temperature of 140-150°C.

[0018] As a preference, the skeleton melt-blown composite treatment includes a spinning temperature of 170-200°C, a spinneret pressure of 18-20 bar, a stretching gas flow pressure of 0.4-0.45 bar, a side-blowing gas flow temperature of 23-25°C, a hot-rolling roller temperature of 130-145°C, a hot-rolling roller pressure of 80-90 daN / cm and a hot-rolling speed of 600-650 m / min.

[0019] As preferred, the conditions of the melt-blowing composite treatment include: a spinning temperature of 200-300 DEG C, a head pressure of 30-35 bar, a drawing airflow pressure of 0.5-0.7 bar, a side-blowing airflow temperature of 23-25 DEG C, a roller pressure of 100-110 daN / cm, a roller speed of 400-500 m / min, a smoothing roller pressure of 70-80 daN / cm, and a smoothing roller speed of 600-650 m / min.

[0020] The application provides a preparation method of a high-dust-carrying capacity filter bag material with deformation resistance, which adopts a melt-blowing method to composite a skeleton layer on a filter layer, and the skeleton layer is made of modified polypropylene melt-blowing made of graphene hollow spheres and polypropylene as raw materials.

[0021] The electrostatic filter layer in the application is made of electrostatic layers on both sides of melt-blowing non-woven fabric polyester through melt-blowing composite, and the electrostatic cotton can assist the non-woven fabric to filter out particles below 1 μm, so that the filtration precision of the filter bag is improved, and the service life of the filter bag is prolonged.

[0022] Compared with the prior art, the application has the following technical effects:

[0023] The application provides a preparation method of a high-dust-carrying capacity filter bag material with deformation resistance, which adopts melt-blowing composite to composite a skeleton layer, a non-woven fabric filter layer, an electrostatic layer and a non-woven fabric filter layer into the high-dust-carrying capacity filter bag material with deformation resistance, and the method does not use a coating and an adhesive. 2 The skeleton layer is made of modified polypropylene made of modified graphene hollow spheres and polypropylene, the grammage of the prepared skeleton layer is 30-60 g / m DETAILED DESCRIPTION

[0024] The application will be further described in connection with the following examples.

[0025] Example 1:

[0026] A preparation method of a high dust capacity filter bag material with deformation resistance, comprising the following steps:

[0027] Preparation of graphene hollow spheres: 1g of glucose, 5g of polyvinyl alcohol, and 0.01g of iron chloride are added to 40ml of deionized water to form a slurry, the slurry is injected into a high-pressure reaction container for one-stage calcination, the calcination temperature is 130℃, the calcination time is 12 hours, after the reaction container is cooled, the solid is separated out; the solid is dried and placed in a microwave heating furnace for two-stage calcination, the calcination temperature is 300℃, the calcination time is 30 minutes, after cooling, the solid is separated out; the solid is placed in a tube furnace, heated at 1000℃ under a nitrogen atmosphere for 2 hours, after cooling, the product is soaked in a hydrochloric acid solution (concentration 1mol / L) for 12 hours, washed with deionized water to clean and dried to obtain graphene hollow spheres (particle size 3-15nm);

[0028] Preparation of modified polypropylene: the graphene hollow spheres prepared above are dispersed in a dispersion liquid (the mass ratio of dimethylformamide, sodium lignosulfonate, and sodium dodecylbenzenesulfonate is 1:0.01:0.05) to form a dispersion slurry, polypropylene masterbatch is injected into a mixing machine, the dispersion slurry is added from the side material port of the mixing machine, (graphene addition amount is 0.1%) and extruded to obtain modified polypropylene; the melt mixing conditions include: feeding section temperature 110℃, conveying section temperature 125℃, melting section temperature 135℃, and extrusion section temperature 140℃;

[0029] Preparation of an electrostatic filtration layer: the electrostatic layer is ES hot air electrostatic cotton (20g / cm 2 ), polypropylene chips and polybutylene terephthalate chips are placed in a drying oven for drying, the dried polypropylene chips and polybutylene terephthalate and chlorinated diphenyl are injected into a mixing machine for mixing to prepare melt-blown non-woven polyester, the melt-blown non-woven polyester chips are injected into a screw extruder for melt extrusion into a spinning device, and the fine filaments are stretched into ultra-fine fibers under the action of the air flow of the air box, the fibers are compounded on the surface of the electrostatic layer after cold air heat exchange, and the electrostatic filtration layer is prepared by using a flower roller hot press and a flat roller hot press, one layer of melt-blown non-woven fabric is compounded on each of the two layers of the electrostatic layer, and the melt-blown conditions include: spinning temperature 200℃, die head pressure 30bar, stretching air flow pressure 0.5bar, side blowing air flow temperature 23℃, roller pressure 100daN / cm, roller speed 400m / min, smoothing roller pressure 70daN / cm, and smoothing roller rolling speed 600m / min

[0030] Preparation of a high dust capacity filter bag material: the polypropylene is injected into a screw extruder and melt extruded into a spinning device, and the fine filaments are stretched into ultra-fine fibers under the action of the air flow of the air box, and the fibers are compounded on the surface of the electrostatic filtration layer after cold air heat exchange to prepare a high dust capacity filter bag material, and the melt blowing conditions include: spinning temperature 200℃, head pressure 18bar, stretching air flow pressure 0.4bar, side blowing air flow temperature 23℃, hot roller temperature 130℃, hot roller pressure 80daN / cm, and hot rolling speed 600m / min.

[0031] Example 2:

[0032] A method for preparing a high dust capacity filter bag material, comprising the following steps:

[0033] Preparation of graphene hollow spheres: 1g of glucose, 5g of polyvinyl alcohol, and 0.01g of iron chloride are added to 40ml of deionized water and stirred uniformly to prepare a slurry, the slurry is injected into a high-pressure reaction container for one-stage calcination, the calcination temperature is 100℃, and the calcination time is 24 hours, after the reaction container is cooled, the solid is separated; the solid is dried and placed in a microwave heating furnace for two-stage calcination, the calcination temperature is 400℃, and the calcination time is 20 minutes, after cooling, the solid is separated; the solid is placed in a tube furnace under a nitrogen atmosphere at 1000℃ for 2 hours, after cooling, the product is soaked in a hydrochloric acid solution (concentration 1mol / L) for 12 hours, washed with deionized water and dried to obtain graphene hollow spheres (particle size 3-15nm);

[0034] Preparation of modified polypropylene: the graphene hollow spheres prepared above are dispersed in a dispersion liquid (the mass ratio of dimethylformamide, sodium lignosulfonate, and sodium dodecylbenzenesulfonate is 1:0.01:0.05) to prepare a dispersion slurry, and the polypropylene master batch is injected into a mixing machine, and the dispersion slurry is added from the side material port of the mixing machine (graphene addition amount is 0.5%), and the modified polypropylene is prepared by extrusion; the melt mixing conditions include: feeding section temperature 115℃, conveying section temperature 130℃, melting section temperature 140℃, and extrusion section temperature 145℃;

[0035] Preparation of an electrostatic filtration layer: the electrostatic layer is ES hot air electrostatic cotton (20g / cm 2), the polypropylene chips, polybutylene terephthalate chips are put into the drying oven for drying, the dried polypropylene chips, polybutylene terephthalate and chlorinated diphenyl are injected into the mixing machine for mixing to prepare the melt-blown non-woven polyester, the melt-blown non-woven polyester chips are injected into the screw extruder for melt extrusion into the spinning device, and the fine filaments are sprayed from the head of the spinning device, the fine filaments are stretched into ultra-fine fibers under the action of the air flow of the air box, the fibers are compounded on the surface of the electrostatic layer after cold air heat exchange, and the electrostatic filter layer is prepared by using the flower roller hot pressing and the flat roller hot pressing, the two layers of the electrostatic layer are respectively compounded with one layer of melt-blown non-woven fabric, and the melt-blown conditions include: spinning temperature 200℃, head pressure 33bar, stretching air flow pressure 0.6bar, side blowing air flow temperature 24℃, roller pressure 105daN / cm, roller speed 450m / min, smoothing roller pressure 75daN / cm, and smoothing roller rolling speed 625m / min

[0036] Preparation of a high dust capacity filter bag material resistant to deformation: the above polypropylene is injected into the screw extruder for melt extrusion into the spinning device, and the fine filaments are sprayed from the head of the spinning device, the fine filaments are stretched into ultra-fine fibers under the action of the air flow of the air box, and the fibers are compounded on the surface of the electrostatic filter layer after cold air heat exchange to prepare the high dust capacity filter bag material resistant to deformation, and the melt-blown conditions include: spinning temperature 200℃, head pressure 19bar, stretching air flow pressure 0.43bar, side blowing air flow temperature 24℃, hot rolling temperature 140℃, hot rolling pressure 85daN / cm, and hot rolling speed 625m / min.

[0037] Example 3:

[0038] A method for preparing a high dust capacity filter bag material resistant to deformation, comprising the following steps:

[0039] Preparation of graphene hollow spheres: 1g of glucose, 5g of polyvinyl alcohol and 0.01g of ferric chloride are added to 40ml of deionized water and stirred uniformly to prepare a slurry, the slurry is injected into a high-pressure reaction container for one-stage calcination, the calcination temperature is 140℃, and the calcination time is 10 hours, after the reaction container is cooled, the solid is separated; the solid is dried and placed in a microwave heating furnace for two-stage calcination, the calcination temperature is 500℃, and the calcination time is 10 minutes, after cooling, the solid is separated; the solid is placed in a tube furnace under a nitrogen atmosphere at 1100℃ for 1 hour, after cooling, the product is soaked in a hydrochloric acid solution (concentration 1mol / L) for 12 hours, washed with deionized water to clean and dried to obtain graphene hollow spheres (particle size 3-15nm);

[0040] Preparation of modified polypropylene: the graphene hollow spheres prepared above are dispersed in a dispersion liquid (the mass ratio of dimethylformamide, sodium lignosulfonate and sodium dodecyl benzene sulfonate is 1:0.01:0.05) to form a dispersion slurry, and the polypropylene master batch is injected into a mixing machine, the dispersion slurry is added from the side material port of the mixing machine, and the graphene is added in an amount of 1%; the modified polypropylene is prepared by extrusion; the melt mixing conditions include: the feeding section temperature is 120℃, the conveying section temperature is 135℃, the melting section temperature is 145℃, and the extrusion section temperature is 150℃.

[0041] Preparation of electrostatic filter layer: the electrostatic layer is ES hot air electrostatic cotton (20g / cm 2 The polypropylene chips and polybutylene terephthalate chips are placed in a drying oven for drying, the dried polypropylene chips, polybutylene terephthalate and chlorinated diphenyl are injected into a mixing machine for mixing to prepare melt-blown non-woven polyester, the melt-blown non-woven polyester chips are injected into a screw extruder for melt extrusion into a spinning device, and the fine filaments are sprayed from the head of the spinning device, stretched into ultra-fine fibers under the action of the air flow of the air box, and compounded on the surface of the electrostatic layer after cold air heat exchange to prepare the electrostatic filter layer, the electrostatic layer is hot pressed with a flower roller and a flat roller to prepare the electrostatic filter layer, and one layer of melt-blown non-woven fabric is compounded on each of the two layers of the electrostatic layer; the melt-blown conditions include: spinning temperature 180℃, head pressure 35bar, stretching air flow pressure 0.7bar, side blowing air flow temperature 25℃, roller pressure 110daN / cm, roller speed 500m / min, smoothing roller pressure 80daN / cm, and smoothing roller rolling speed 650m / min

[0042] Preparation of deformation-resistant high-dust-capacity filter bag material: the polypropylene above is injected into a screw extruder for melt extrusion into a spinning device, and the fine filaments are sprayed from the head of the spinning device, stretched into ultra-fine fibers under the action of the air flow of the air box, and compounded on the surface of the electrostatic filter layer after cold air heat exchange to prepare the deformation-resistant high-dust-capacity filter bag material; the melt-blown conditions include: spinning temperature 250℃, head pressure 20bar, stretching air flow pressure 0.45bar, side blowing air flow temperature 25℃, hot rolling roller temperature 145℃, hot rolling roller pressure 90daN / cm, and hot rolling speed 650m / min.

[0043] Example 4:

[0044] A method for preparing a deformation-resistant high-dust-capacity filter bag material, comprising the following steps:

[0045] Preparation of graphene hollow spheres: 1g glucose, 5g polyvinyl alcohol, 0.01g cobalt chloride are added into 40ml deionized water to make a slurry, the slurry is injected into a high-pressure reaction vessel for one-stage calcination, the calcination temperature is 220℃, the calcination time is 12 hours, after the reaction vessel is cooled, the solid is separated; the solid is dried and placed in a microwave heating furnace for two-stage calcination, the calcination temperature is 500℃, the calcination time is 2 minutes, after cooling, the solid is separated; the solid is placed in a tube furnace under nitrogen atmosphere at 1100℃ for 1 hour, after cooling, the product is soaked in hydrochloric acid solution (concentration 1mol / L) for 12 hours, washed with deionized water and dried to obtain graphene hollow spheres (average particle size 3-20nm);

[0046] Preparation of modified polypropylene: the graphene hollow spheres prepared above are dispersed in a dispersion liquid (dimethylformamide) to make a dispersion slurry, and then polypropylene masterbatch is injected into a mixing machine, and the dispersion slurry is added from the side material port of the mixing machine (graphene addition amount is 1%), and modified polypropylene is prepared by extrusion; the melt mixing conditions include: feeding section temperature 105℃, conveying section temperature 130℃, melting section temperature 140℃, and extrusion section temperature 145℃;

[0047] Preparation of electrostatic filtration layer: the electrostatic layer is ES hot air electrostatic cotton (20g / cm 2 ), polypropylene chips and polybutylene terephthalate chips are placed in a drying oven for drying, and the dried polypropylene chips, polybutylene terephthalate and chlorinated diphenyl are injected into a mixing machine for mixing to prepare melt-blown non-woven polyester, the melt-blown non-woven polyester chips are injected into a screw extruder for melt extrusion into a spinning device, and fine filaments are sprayed from the head of the spinning device, the fine filaments are stretched into ultra-fine fibers under the action of the air flow of the air box, and the fibers are compounded on the surface of the electrostatic layer after cold air heat exchange, and the electrostatic filtration layer is prepared by using a flower roller hot press and a flat roller hot press, and the electrostatic layer is compounded with one layer of melt-blown non-woven fabric on both sides, and the melt-blown conditions include: spinning temperature 200℃, head pressure 35bar, stretching air flow pressure 0.6bar, side blowing air flow temperature 24℃, roller pressure 105daN / cm, roller speed 450m / min, smoothing roller pressure 75daN / cm, and smoothing roller rolling speed 600m / min

[0048] Preparation of deformation-resistant high-dust-carrying capacity filter bag material: the above polypropylene is injected into a screw extruder for melt extrusion into a spinning device, and fine filaments are sprayed from the head of the spinning device, the fine filaments are stretched into ultra-fine fibers under the action of the air flow of the air box, and the deformation-resistant high-dust-carrying capacity filter bag material is prepared by compounding the fibers on the surface of the electrostatic filtration layer after cold air heat exchange, and the melt-blown conditions include: spinning temperature 300℃, head pressure 20bar, stretching air flow pressure 0.45bar, side blowing air flow temperature 24℃, hot rolling temperature 140℃, hot rolling pressure 85daN / cm, and hot rolling speed 650m / min.

[0049] Example 5:

[0050] A method for preparing a high dust capacity filter bag material with deformation resistance, comprising the following steps:

[0051] Preparation of graphene hollow spheres: 1g of glucose, 5g of polyvinyl alcohol, and 0.01g of nickel chloride are added to 40ml of deionized water and stirred uniformly to form a slurry, the slurry is injected into a high-pressure reaction container for one-stage calcination, the calcination temperature is 150℃, the calcination time is 8 hours, after the reaction container is cooled, the solid is separated out; the solid is dried and placed in a microwave heating furnace for two-stage calcination, the calcination temperature is 450℃, the calcination time is 15 minutes, after cooling, the solid is separated out; the solid is placed in a tube furnace under a nitrogen atmosphere at 1100℃ for 1 hour, after cooling, the product is soaked in a hydrochloric acid solution (concentration 1mol / L) for 12 hours, washed clean with deionized water and dried to obtain graphene hollow spheres (average particle size 3-18nm);

[0052] Preparation of modified polypropylene: the graphene hollow spheres prepared above are dispersed in a dispersion liquid to form a dispersion slurry (the mass ratio of sodium lignosulfonate and sodium dodecylbenzenesulfonate is 1:5), polypropylene masterbatch is injected into a mixing machine, the dispersion slurry is added from the side material port of the mixing machine (the graphene addition amount is 1%), and modified polypropylene is prepared by extrusion; the melt mixing conditions include: feeding section temperature 120℃, conveying section temperature 130℃, melting section temperature 140℃, and extrusion section temperature 150℃;

[0053] Preparation of an electrostatic filtration layer: the electrostatic layer is ES hot air electrostatic cotton (20g / cm 2 ), polypropylene chips and polybutylene terephthalate chips are placed in a drying oven for drying, the dried polypropylene chips and polybutylene terephthalate and chlorinated diphenyl are injected into a mixing machine for mixing to prepare melt-blown non-woven polyester, the melt-blown non-woven polyester chips are injected into a screw extruder for melt extrusion into a spinning device, and fine fibers are sprayed from the spinneret head under the action of the air flow of the air box, the fibers are stretched into ultra-fine fibers after cold air heat exchange, and the fibers are compounded on the surface of the electrostatic layer after heat exchange, a flower roller hot press and a flat roller hot press are used to prepare an electrostatic filtration layer, one layer of melt-blown non-woven fabric is compounded on each of the two layers of the electrostatic layer, and the melt-blown conditions include: spinning temperature 190℃, head pressure 33bar, stretching air flow pressure 0.6bar, side blowing air flow temperature 24℃, roller pressure 100-110daN / cm, roller speed 450m / min, smoothing roller pressure 80daN / cm, and smoothing roller rolling speed 650m / min

[0054] Preparation of the high dust capacity filter bag material: the polypropylene is injected into the screw extruder and melt extruded into the spinning device, and the fine filaments are stretched into ultra-fine fibers under the action of the air flow of the air box, and the fibers are compounded on the surface of the electrostatic filtration layer after cold air heat exchange to prepare the high dust capacity filter bag material, and the melt-blowing conditions include: spinning temperature 250℃, head pressure 20bar, stretching air flow pressure 0.4bar, side blowing air flow temperature 25℃, hot roller temperature 140℃, hot roller pressure 85daN / cm, and hot rolling speed 625m / min.

[0055] Comparative Example 1: (no graphene hollow spheres are added in the polypropylene, and the average fiber diameter of the skeleton layer is 60μm)

[0056] Comparative Example 1 does not add graphene hollow spheres, and the average fiber diameter of the skeleton layer is 60μm, and the rest of the conditions are the same as those of Example 3.

[0057] Comparative Example 2: (no graphene hollow spheres are added in the polypropylene, and the fiber diameter of the skeleton layer is 30μm)

[0058] Comparative Example 2 does not add graphene hollow spheres, and the fiber diameter of the skeleton layer is 30μm, and the rest of the conditions are the same as those of Example 3.

[0059] Comparative Example 3: (graphene replaces graphene hollow spheres)

[0060] Comparative Example 3 uses graphene to replace graphene hollow spheres, and the rest of the conditions are the same as those of Example 3.

[0061] Comparative Example 4: (silicon dioxide replaces graphene hollow spheres)

[0062] Comparative Example 4 uses silicon dioxide to replace graphene hollow spheres, and the rest of the conditions are the same as those of Example 3.

[0063] Detection Example:

[0064] The performance of the filter materials prepared in Examples 1-5 and Comparative Examples 1-3 is tested, and the test items include: stiffness, skeleton layer weight, filter material weight, and average fiber diameter of the skeleton layer;

[0065] The test method of stiffness refers to GB / T 18318.1-2009 Textiles-Determination of bending properties-Part 6-Saddle method; the test methods of skeleton layer weight and filter material weight refer to GB / T 24218-2010 Textiles-Test methods for nonwovens;

[0066] The average fiber diameter of the skeleton layer is tested according to GB / T 10685-2007 Wool Fiber Diameter Test Method Projection Microscope Method.

[0067] The test results are shown in Table 1.

[0068] Table 1: Test results of filter material performance

[0069]

[0070] As shown in Table 1, Examples 1-5 are filter materials prepared by using the method for preparing a high dust capacity filter bag material provided by the present application. After testing, the rebound rates of the filter materials of Examples 1-5 are between 73.52-81.87%, the grammage of the skeleton layer is between 30-60 g / m 2 , the average fiber diameter of the skeleton layer is 40-60 μm, and the dust capacity of the filter material is 1.5-2.5 g / g. The above results show that the filter material prepared by using the method provided by the present application has high stiffness, strong deformation resistance, light weight, high dust capacity, and long service life.

[0071] Comparative Examples 1 and 2 are not modified by using graphene hollow spheres. In Comparative Example 1, the average fiber diameter of the skeleton layer is 60 μm, and in Comparative Example 2, the average fiber diameter of the skeleton layer is 30 μm. From the results of Comparative Examples 1 and 2, when the average fiber diameter is 60 μm in Comparative Example 1, the rebound rate of the filter material is 64.34%, and when the average fiber diameter is 30 μm in Comparative Example 2, the rebound rate of the filter material is only 48.36%. It can be seen that the thickness of the average fiber diameter of the skeleton layer has a great influence on the stiffness of the skeleton layer. When the fiber diameter of the polypropylene material is below 30 μm, the stiffness of the filter material is low, and the material is relatively soft. When the fiber diameter of the polypropylene material exceeds 30 μm, the stiffness of the filter material increases, and the softness of the filter material is poor. In addition, the grammage of the filter layer also significantly increases when the fiber diameter increases, which increases the production cost and the overall weight of the filter material, which is not conducive to practical application. However, when the average fiber diameter of the skeleton layer of the filter material prepared by using the method provided by the present application is 60 μm, the grammage is only 60 g / m 2 , the weight is significantly reduced, and the rebound rate of the filter material can reach 82.38%. The stiffness of the filter material is significantly improved, and the rebound elasticity of the filter material is significantly improved after being bent by external force, which can significantly improve the deformation resistance of the filter bag during filtration.

[0072] In Comparative Example 3, ordinary graphene is used instead of graphene hollow spheres. From the results of Comparative Example 3, it can be seen that the rebound rate of Comparative Example 3 is 68.31%, and the grammage of the skeleton layer is 73 g / m 2 . It can be seen that the use of graphene can increase the stiffness of the fibers of the skeleton layer, but it does not have the significant effect of using graphene hollow spheres, and the grammage of the skeleton layer is significantly higher than that of the technical method using graphene hollow spheres.

[0073] In the comparative example 4, the solid silica is used to replace the graphene hollow sphere. It can be seen from the results of the comparative example 4 that the rebound rate of the comparative example 4 is 69.58%, and the grammage of the skeleton layer is 100 g / m 2 It can be seen that after the polypropylene is modified by using other solid fillers, the stiffness of the filter material can be significantly increased, but under the same fiber diameter, the grammage of the skeleton layer is extremely significantly increased, and the weight of the filter material is significantly increased, which cannot meet the use requirements.

[0074] The above is only a preferred embodiment of the present application, not any limitation on the present application, any simple modification, change and equivalent transformation of the above embodiment according to the technical essence of the present application still belongs to the protection scope of the technical solution of the present application.

Claims

1. A process for making a high capacity, deformation resistant filter bag material, characterized by, The skeleton layer is made of modified polypropylene, and the modified polypropylene is made of graphene hollow spheres, a dispersing agent and polypropylene as raw materials through mixing; the electrostatic filtration layer is made of melt-blown non-woven polyester fibers through filtration melt-blown composite treatment to the surfaces of both sides of the electrostatic cotton; the addition amount of the graphene hollow spheres is 0.1-1%, and the average fiber diameter of the skeleton layer is 40-60 microns; the graphene hollow spheres are made of a carbon source, a surfactant and a catalyst as raw materials through calcination treatment and pickling treatment; the calcination treatment includes one-stage calcination, two-stage calcination and three-stage calcination; the one-stage calcination conditions include a temperature of 100-160 DEG C and a time of 5-24 hours; the two-stage calcination conditions include a temperature of 300-500 DEG C and a time of 10-30 minutes; and the three-stage calcination conditions include a nitrogen atmosphere, a temperature of 1000-1100 DEG C and a time of 1-2 hours.

2. The production method according to claim 1, wherein The carbon source is glucose; the surfactant is one or more of polyvinyl alcohol and polyethylene glycol; and the catalyst is one or more of nickel salt, cobalt salt and iron salt.

3. The preparation method according to claim 1, characterized in that, The three-stage calcination conditions further include a nitrogen atmosphere.

4. The method of claim 1 wherein the step of forming the first and second layers comprises the step of: The dispersing agent is one or more of dimethylformamide, sodium lignosulfonate and sodium dodecylbenzenesulfonate. ​ 5. The production method according to claim 1, characterized by, The mixing conditions include a feeding section temperature of 110-120 DEG C, a conveying section temperature of 125-135 DEG C, a melting section temperature of 135-145 DEG C and an extrusion section temperature of 140-150 DEG C.

6. The production method according to claim 1, characterized by, The skeleton melt-blown composite treatment conditions include a spinning temperature of 170-200 DEG C, a spinneret pressure of 18-20 bar, a stretching gas flow pressure of 0.4-0.45 bar, a side-blowing gas flow temperature of 23-25 DEG C, a hot roller temperature of 130-145 DEG C, a hot roller pressure of 80-90 daN / cm and a hot rolling speed of 600-650 m / min.

7. The production method according to claim 1, characterized by, The filtration melt-blown composite treatment conditions include a spinning temperature of 200-300 DEG C, a spinneret pressure of 30-35 bar, a stretching gas flow pressure of 0.5-0.7 bar, a side-blowing gas flow temperature of 23-25 DEG C, a roller pressure of 100-110 daN / cm, a roller speed of 400-500 m / min, a smoothing roller pressure of 70-80 daN / cm and a smoothing roller rolling speed of 600-650 m / min.

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