CN109224630B - Hybrid fiber mesh fabric reinforced polypropylene composite filter plate and preparation method thereof - Google Patents
Hybrid fiber mesh fabric reinforced polypropylene composite filter plate and preparation method thereof Download PDFInfo
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- CN109224630B CN109224630B CN201811093358.8A CN201811093358A CN109224630B CN 109224630 B CN109224630 B CN 109224630B CN 201811093358 A CN201811093358 A CN 201811093358A CN 109224630 B CN109224630 B CN 109224630B
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- -1 polypropylene Polymers 0.000 title claims abstract description 49
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 47
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 36
- 239000007822 coupling agent Substances 0.000 claims abstract description 24
- 239000011347 resin Substances 0.000 claims abstract description 24
- 229920005989 resin Polymers 0.000 claims abstract description 24
- 239000012784 inorganic fiber Substances 0.000 claims abstract description 21
- 239000000843 powder Substances 0.000 claims abstract description 14
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 12
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- UQZIWOQVLUASCR-UHFFFAOYSA-N alumane;titanium Chemical compound [AlH3].[Ti] UQZIWOQVLUASCR-UHFFFAOYSA-N 0.000 claims description 2
- 150000004645 aluminates Chemical class 0.000 claims description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 2
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 claims description 2
- 239000008116 calcium stearate Substances 0.000 claims description 2
- 235000013539 calcium stearate Nutrition 0.000 claims description 2
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- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 2
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Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
- B01D25/12—Filter presses, i.e. of the plate or plate and frame type
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Materials (AREA)
- Nonwoven Fabrics (AREA)
Abstract
The invention provides a hybrid fiber mesh fabric reinforced polypropylene composite filter plate and a preparation method thereof, the filter plate takes composite fiber reinforced polypropylene woven by inorganic fiber and organic fiber as a main material, and comprises the following components by weight: polypropylene resin, inorganic mineral powder, continuous inorganic fiber, continuous organic fiber, coupling agent, antioxidant and lubricant. According to the manufacturing method, due to the composite components and the structural characteristics of the mesh cloth, the whole structure and the mechanical property of the filter plate are isotropic; the forming method of step-by-step pressure rise, temperature rise, pressure maintaining and heat preservation is adopted, and pressure shaping is carried out at normal temperature, so that the internal stress of the filter plate is relaxed, the filter plate is ensured to be compact, and the density and the size are stable and uniform.
Description
Technical Field
The invention relates to the field of filter presses of filter equipment, in particular to a hybrid fiber mesh fabric reinforced polypropylene composite filter plate and a preparation method thereof.
Background
The filter press is a common solid-liquid separation device, the filtering mechanism is a core component of the filter press, the filter plate is a key element of the filtering mechanism, the material and performance of the filter plate play a vital role in material filtering, and the filter plate directly determines whether the filtering mechanism can normally operate, so that the service life and the filtering effect of the filter press are related. The filtered material enters each filter chamber from a feed hole on a thrust plate of the filter press, the filter cloth is compressed by the pressure between the plate frames, solid particles are intercepted in the filter chambers to form filter cakes because the particle size is larger than the aperture of the filter cloth, and filtrate flows out from a liquid outlet hole below the filter plate, so that the aim of solid-liquid separation is fulfilled.
Due to the urgent needs of technical progress, environmental protection and cost reduction, the variety of materials to be filtered is increasing and the requirement on the filtering efficiency is higher in the solid-liquid separation industries of oil exploitation, water treatment, chemical preparation, industrial manufacture, new energy and the like. Among the materials filtered at present, materials with high temperature, corrosive materials and materials with high sanitary requirements are many, for example: during the production of pesticides, sugar industry and other biological pharmacy and sewage treatment, some filtered materials have the temperature as high as more than 80 ℃, and some materials have strong acidity and alkalinity. The reinforced polypropylene filter plate material commonly used at present has the defects of low softening temperature, poor corrosion resistance, low strength and the like, is not more and more difficult to be suitable for diversified, complicated and refined filtering requirements, and has the results of high filtering cost, low filtering efficiency, short service life and the like, thereby becoming the main problems which are urgently needed to be solved by the filter press industry. In order to solve the above problems, chinese patent CN100360296C (a method for forming plastic filter plates) uses a method of combining an injection part of an injection molding machine with a vertical oil press, so that filter plates with large weight and specification can be automatically produced, and the strength of the filter plates is improved. The invention patent CN 105924951B (a filter press plate of a nylon plate-and-frame filter press and a manufacturing method thereof) well solves the problem that the current filter plate can not resist high temperature and high pressure, but still has the problems that the filter plate is easy to age and the cost of raw materials is high due to secondary high-temperature forming. Patent CN 104526953B (a preparation method of polypropylene filter plate) provides a method for preparing filter plates by rapid injection molding, which greatly reduces the production cycle of filter plates, but the equipment investment is high and the specification of filter plates is limited.
Disclosure of Invention
The invention provides a hybrid fiber mesh fabric reinforced polypropylene composite filter plate and a preparation method thereof, and solves the problems of insufficient stability and strength of the filter plate in the prior art.
The technical scheme for realizing the invention is as follows: a hybrid fiber mesh fabric reinforced polypropylene composite filter plate comprises the following components in parts by weight: 50-70 parts of polypropylene resin, 8-20 parts of inorganic mineral powder, 10-20 parts of continuous inorganic fiber, 10-20 parts of continuous organic fiber, 1.0-2.0 parts of coupling agent, 0.2-0.5 part of antioxidant and 0.2-0.5 part of lubricant.
The continuous inorganic fiber is any one of glass fiber and carbon fiber.
The continuous organic fiber is any one of polypropylene and nylon.
The inorganic mineral powder is any one of talcum powder, mica powder and heavy calcium carbonate.
The coupling agent is any one of silane coupling agent, aluminum-titanium composite coupling agent, aluminate coupling agent and titanate coupling agent.
The lubricant is at least two of polyethylene wax, calcium stearate, glyceryl stearate, oxidized polyethylene wax and white oil.
The polypropylene resin is any one of an extrusion grade and an injection grade.
The preparation method of the hybrid fiber mesh fabric reinforced polypropylene composite filter plate comprises the following steps:
(1) weaving and dipping: weaving continuous inorganic fibers and continuous organic fibers into composite mesh cloth, soaking the composite mesh cloth in a coupling agent at normal temperature for 8-12h, and airing for later use;
(2) taking materials: uniformly mixing the rest components in parts by weight, and drying at 80 ℃ for 30min to obtain a mixture;
(3) die-casting and forming:
a) firstly, putting a piece of composite mesh cloth in a die-casting die, then flatly paving the mixture on the composite mesh cloth, repeatedly paving the piece of composite mesh cloth and the mixture for 3-5 times, slowly heating to 150-170 ℃, applying 1/3-1/2 with full pressure, and preserving heat for 20-30 min; (full pressure of hot press 3150KN, Zhongcheng forging Press, model YA 32-315);
b) heating slowly, keeping constant when the temperature reaches 185 deg.C, increasing pressure to 2/3 of full pressure, maintaining the temperature and pressure for 20-30min, and compressing to 1cm2Molding by 200KN compression molding, and keeping the temperature and pressure for 20-50 min;
c) keeping the pressure, and cooling;
(4) shaping: and taking out the blank of the filter plate, putting the blank of the filter plate into a pressure setting machine, and compacting and setting for 24 hours to obtain the composite filter plate.
In the step a), the temperature is increased to 150-170 ℃ at the temperature increase rate of 5 ℃/min.
The invention has the beneficial effects that:
1) inorganic fiber and organic fiber composite mesh cloth is added into polypropylene resin, so that the reinforcing effect is good, isotropy is realized, and the heat resistance, corrosion resistance and mechanical strength of the filter plate are improved;
2) the polypropylene resin is added with the coupling agent to enhance the compatibility and the adhesive property, improve the processing property and the physical and mechanical properties, reduce the water absorption rate and stabilize the size and the density of the filter plate;
3) inorganic mineral powder is added into the polypropylene resin to prevent the filter plate from warping and deforming, so that the stability of the filter plate is improved;
4) the high-temperature and high-pressure resistance of the filter pressing plate is further improved by the synergistic effect of the polypropylene resin, the inorganic mineral powder and the continuous fibers;
5) the polypropylene has good oxidation resistance by adding the composite antioxidant, the thermal stability of the filter plate is effectively improved, and the service life is prolonged;
6) the lubricant plays a role of a heat stabilizer, and the lubricant which is dispersed in the material and is not melted also plays a role of a framework within a certain range;
7) according to the manufacturing method, due to the composite components and the structural characteristics of the mesh cloth, the whole structure and the mechanical property of the filter plate are isotropic; the forming method of step-by-step pressure rise, temperature rise, pressure maintaining and heat preservation is adopted, and pressure shaping is carried out at normal temperature, so that the internal stress of the filter plate is relaxed, the filter plate is ensured to be compact, and the density and the size are stable and uniform.
Therefore, the thickness and the mass of the filter plate can be reduced by 20 percent, the filter plate does not warp and deform, does not swell and damage, and does not soften filtered high-temperature materials. The problems that the existing filter plate is not resistant to high temperature and high pressure and is easy to deform are well solved, and the filter plate has a good industrial application prospect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a hybrid fiber mesh fabric reinforced polypropylene composite filter plate and a preparation method thereof.
Fig. 2 is a schematic representation of a hybrid fiber mesh fabric of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
The hybrid fiber mesh fabric reinforced polypropylene composite filter plate comprises the following components in parts by weight:
a polypropylene resin 60;
14 of inorganic mineral powder;
continuous inorganic fibers 12;
a continuous organic fiber 12;
1.5 of a coupling agent;
0.25 parts of antioxidant;
0.25 parts of lubricant.
A preparation method of a hybrid fiber mesh fabric reinforced polypropylene composite filter plate comprises the following steps:
step 1, weaving and dipping: compounding and weaving inorganic fiber and organic fiber into mesh cloth according to a certain proportion, impregnating coupling agent, and airing for standby;
step 2, material taking: taking other components according to the weight part ratio, uniformly mixing, and drying to remove water to obtain a mixture;
step 3, die-casting and forming:
1) putting a piece of glass inorganic fiber and organic fiber composite mesh cloth in a die-casting die, pouring the mixed material on the mesh cloth layer and flattening, repeating the mode of firstly paving a piece of composite mesh cloth and then flattening a layer of mixed material on the composite mesh cloth layer for 3 times, preheating a press, slowly heating to 170 ℃, applying 1/3 with full pressure, preserving heat for 20min, uniformly heating and melting the resin of a core layer, and mutually fusing the interfaces of the resin layers;
2) and (3) continuously and slowly heating, keeping constant after the temperature reaches the maximum value, continuously increasing the pressure to 2/3 of full pressure, keeping the temperature and the pressure for 30min, ensuring uniform plasticization, ensuring the fusion bonding among the layers of the material sheets, and forming a whole with a uniform and compact structure under the action of pressure. Final pressing pressure of 1cm2Molding by 200KN compression, and keeping the temperature, the pressure and the pressure for 50min to obtain the finished product with the optimal performance;
3) keeping the pressure, and naturally cooling or introducing cooling water into a hot plate of a press to cool;
step 4, shaping: and taking out the blank of the filter plate, putting the blank of the filter plate into a pressure setting machine, and compacting and setting for 24 hours to obtain the composite filter plate.
Example 2
The hybrid fiber mesh fabric reinforced polypropylene composite filter plate comprises the following components in parts by weight:
a polypropylene resin 50;
18 parts of inorganic mineral powder;
continuous inorganic fibers 15;
a continuous organic fiber 15;
1.5 of a coupling agent;
0.25 parts of antioxidant;
0.25 parts of lubricant.
A preparation method of a hybrid fiber mesh fabric reinforced polypropylene composite filter plate comprises the following steps:
step 1, weaving and dipping: compounding and weaving inorganic fiber and organic fiber in certain proportion into composite mesh cloth, soaking in coupling agent, and air drying for use;
step 2, material taking: taking other components according to the weight part ratio, uniformly mixing, and drying to remove water to obtain a mixture;
step 3, die-casting and forming:
1) putting a piece of inorganic fiber and organic fiber composite mesh cloth in a die-casting die, pouring the mixed material on the mesh cloth layer and flattening, repeating the way of firstly paving a piece of composite mesh cloth and then flattening a layer of the mixed material on the composite mesh cloth layer for 5 times, preheating a press, slowly heating to 170 ℃, applying 1/3 with full pressure, preserving heat for 30min, uniformly heating and melting the resin of the core layer, and mutually fusing the interfaces of the resin layers;
2) and (3) continuously and slowly heating, keeping constant after the temperature reaches the maximum value, continuously increasing the pressure to 2/3 of full pressure, keeping the temperature and the pressure for 30min, ensuring uniform plasticization, ensuring the fusion bonding among the layers of the material sheets, and forming a whole with a uniform and compact structure under the action of pressure. Final pressing pressure of 1cm2Molding by 200KN compression, and keeping the temperature, the pressure and the pressure for 50min to obtain the finished product with the optimal performance;
3) keeping the pressure, and naturally cooling or introducing cooling water into a hot plate of a press to cool;
step 4, shaping: and taking out the blank of the filter plate, putting the blank of the filter plate into a pressure setting machine, and compacting and setting for 24 hours to obtain the composite filter plate.
Example 3
The hybrid fiber mesh fabric reinforced polypropylene composite filter plate comprises the following components in parts by weight:
a polypropylene resin 70;
8, inorganic mineral powder;
continuous inorganic fibers 10;
a continuous organic fiber 10;
1.5 of a coupling agent;
0.25 parts of antioxidant;
0.25 parts of lubricant.
A preparation method of a hybrid fiber mesh fabric reinforced polypropylene composite filter plate comprises the following steps:
step 1, weaving and dipping: compounding and weaving inorganic fibers and organic fibers into mesh cloth according to a certain proportion, impregnating a coupling agent for 12 hours at normal temperature, and airing for later use;
step 2, material taking: taking other components according to the weight part ratio, uniformly mixing, and drying to remove water to obtain a mixture;
step 3, die-casting and forming:
1) putting a piece of composite mesh cloth in a die-casting die, pouring the mixed material on the mesh cloth layer and flattening, repeating the way of firstly laying a piece of composite mesh cloth and then flattening a layer of the mixed material on the composite mesh cloth layer for 4 times, preheating a press, slowly heating to 170 ℃ at the speed of 5 ℃/min, applying 2/5 with full pressure, preserving heat for 30min, uniformly heating and melting the core layer resin, and mutually fusing the interfaces of the resin layers;
2) and (3) continuously and slowly heating, keeping constant after the temperature reaches the maximum value, continuously increasing the pressure to 2/3 of full pressure, keeping the temperature and the pressure for 30min, ensuring uniform plasticization, ensuring the fusion bonding among the layers of the material sheets, and forming a whole with a uniform and compact structure under the action of pressure. Final pressing pressure of 1cm2Molding by 200KN compression, and keeping the temperature, the pressure and the pressure for 50min to obtain the finished product with the optimal performance;
3) keeping the pressure, and naturally cooling or introducing cooling water into a hot plate of a press to cool;
step 4, shaping: and taking out the blank of the filter plate, putting the blank of the filter plate into a pressure setting machine, and compacting and setting for 24 hours to obtain the composite filter plate.
Example 4
The hybrid fiber mesh fabric reinforced polypropylene composite filter plate comprises the following components in parts by weight:
a polypropylene resin 70;
20 parts of inorganic mineral powder;
continuous inorganic fibers 20;
a continuous organic fiber 20;
a coupling agent 2;
0.5 of antioxidant;
0.5 of lubricant.
A preparation method of a hybrid fiber mesh fabric reinforced polypropylene composite filter plate comprises the following steps:
step 1, weaving and dipping: compounding and weaving inorganic fibers and organic fibers into mesh cloth according to a certain proportion, soaking the mesh cloth in a coupling agent for 10 hours at normal temperature, and airing for later use;
step 2, material taking: taking other components according to the weight part ratio, uniformly mixing, and drying to remove water to obtain a mixture;
step 3, die-casting and forming:
1) putting a piece of composite mesh cloth in a die-casting die, pouring the mixed material on the mesh cloth layer and flattening, repeating the mode of firstly laying a piece of composite mesh cloth and then flattening a layer of the mixed material on the composite mesh cloth layer for 3 times, preheating a press, slowly heating to 150 ℃ at a speed of 5 ℃/min, applying 1/3 with full pressure, preserving heat for 20min, uniformly heating and melting the core layer resin, and mutually fusing the interfaces of the resin layers;
2) and (3) continuously and slowly heating, keeping constant after the temperature reaches the maximum value, continuously increasing the pressure to 2/3 of full pressure, keeping the temperature and the pressure for 20min, ensuring uniform plasticization, ensuring the fusion bonding among the layers of the material sheets, and forming a whole with a uniform and compact structure under the action of pressure. Final pressing pressure of 1cm2Molding by 200KN compression, and keeping the temperature, the pressure and the pressure for 20min to form the finished product with the optimal performance;
3) keeping the pressure, and naturally cooling or introducing cooling water into a hot plate of a press to cool;
step 4, shaping: and taking out the blank of the filter plate, putting the blank of the filter plate into a pressure setting machine, and compacting and setting for 24 hours to obtain the composite filter plate.
Example 5
The hybrid fiber mesh fabric reinforced polypropylene composite filter plate comprises the following components in parts by weight:
a polypropylene resin 70;
15 parts of inorganic mineral powder;
continuous inorganic fibers 10;
a continuous organic fiber 10;
a coupling agent 1;
0.2 of antioxidant;
0.2 parts of lubricant.
A preparation method of a hybrid fiber mesh fabric reinforced polypropylene composite filter plate comprises the following steps:
step 1, weaving and dipping: compounding and weaving inorganic fibers and organic fibers into mesh cloth according to a certain proportion, soaking the mesh cloth in a coupling agent at normal temperature for 8 hours, and airing the mesh cloth for later use;
step 2, material taking: taking other components according to the weight part ratio, uniformly mixing, drying at 80 ℃ for 30min, and removing water to obtain a mixture;
step 3, die-casting and forming:
1) putting a piece of composite mesh cloth in a die-casting die, pouring the mixed material on the mesh cloth layer and flattening, repeating the way of firstly laying a piece of composite mesh cloth and then flattening a layer of the mixed material on the composite mesh cloth for 5 times, preheating a press, slowly heating to 160 ℃ at a speed of 5 ℃/min, applying 1/2 with full pressure, preserving heat for 25min, uniformly heating and melting the core layer resin, and mutually fusing the interfaces of the resin layers;
2) and (3) continuously and slowly heating, keeping constant after the temperature reaches the maximum value, continuously increasing the pressure to 2/3 of full pressure, keeping the temperature and the pressure for 25min, ensuring uniform plasticization, ensuring the fusion bonding among the layers of the material sheets, and forming a whole with a uniform and compact structure under the action of pressure. Final pressing pressure of 1cm2Molding by 200KN compression, and keeping the temperature, the pressure and the pressure for 40min to form the finished product with the optimal performance;
3) keeping the pressure, and naturally cooling or introducing cooling water into a hot plate of a press to cool;
step 4, shaping: and taking out the blank of the filter plate, putting the blank of the filter plate into a pressure setting machine, and compacting and setting for 24 hours to obtain the composite filter plate.
TABLE 1 temperature and pressure resistance comparison table of filter plates of various examples and common PP filter plates
As can be seen from table 1, the filter plate of the present invention is more pressure resistant and also more temperature resistant than the conventional PP filter plate.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. The hybrid fiber mesh fabric reinforced polypropylene composite filter plate is characterized by comprising the following components in parts by weight: 50-70 parts of polypropylene resin, 8-20 parts of inorganic mineral powder, 10-20 parts of continuous inorganic fiber, 10-20 parts of continuous organic fiber, 1.0-2.0 parts of coupling agent, 0.2-0.5 part of antioxidant and 0.2-0.5 part of lubricant;
the preparation method of the hybrid fiber mesh fabric reinforced polypropylene composite filter plate comprises the following steps:
(1) weaving and dipping: weaving continuous inorganic fibers and continuous organic fibers into composite mesh cloth, soaking the composite mesh cloth in a coupling agent at normal temperature for 8-12h, and airing for later use;
(2) taking materials: uniformly mixing the rest components in parts by weight, and drying at 80 ℃ for 30min to obtain a mixture;
(3) die-casting and forming:
a) firstly, putting a piece of composite mesh cloth in a die-casting die, then flatly paving the mixture on the composite mesh cloth, repeatedly paving the piece of composite mesh cloth and the mixture for 3-5 times, slowly heating to 150-170 ℃, applying 1/3-1/2 with full pressure, and preserving heat for 20-30 min;
b) heating slowly, keeping constant when the temperature reaches 185 deg.C, increasing pressure to 2/3 of full pressure, maintaining the temperature and pressure for 20-30min, and compressing to 1cm2Molding by 200KN compression molding, and keeping the temperature and pressure for 20-50 min;
c) keeping the pressure, and cooling;
(4) shaping: and taking out the blank of the filter plate, putting the blank of the filter plate into a pressure setting machine, and compacting and setting for 24 hours to obtain the composite filter plate.
2. The hybrid fiber mesh fabric reinforced polypropylene composite filter plate of claim 1, wherein: the continuous inorganic fiber is any one of glass fiber and carbon fiber.
3. The hybrid fiber mesh fabric reinforced polypropylene composite filter plate of claim 1, wherein: the continuous organic fiber is any one of polypropylene and nylon.
4. The hybrid fiber mesh fabric reinforced polypropylene composite filter plate of claim 1, wherein: the inorganic mineral powder is any one of talcum powder, mica powder and heavy calcium carbonate.
5. The hybrid fiber mesh fabric reinforced polypropylene composite filter plate of claim 1, wherein: the coupling agent is any one of silane coupling agent, aluminum-titanium composite coupling agent, aluminate coupling agent and titanate coupling agent.
6. The hybrid fiber mesh fabric reinforced polypropylene composite filter plate of claim 1, wherein: the lubricant is at least two of polyethylene wax, calcium stearate, glyceryl stearate, oxidized polyethylene wax and white oil.
7. The hybrid fiber mesh fabric reinforced polypropylene composite filter plate of claim 1, wherein: the polypropylene resin is any one of an extrusion grade and an injection grade.
8. The hybrid fiber mesh fabric reinforced polypropylene composite filter plate of claim 1, wherein: in the step a), the temperature is increased to 150-170 ℃ at the temperature increase rate of 5 ℃/min.
Priority Applications (1)
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Effective date of registration: 20240614 Address after: 461670 Yuzhou City, Xuchang, Henan province no beam Economic Development Zone (no beam intersection) Patentee after: HENAN DAZHANG FILTER EQUIPMENT Co.,Ltd. Country or region after: China Address before: 451191 No. 1 Huaihe Road, Shuang Hu Economic and Technological Development Zone, Xinzheng, Zhengzhou, Henan Patentee before: ZHONGYUAN University OF TECHNOLOGY Country or region before: China |