CN113020133A - Cleaning method of polyacrylonitrile carbon fiber precursor drying densification equipment - Google Patents
Cleaning method of polyacrylonitrile carbon fiber precursor drying densification equipment Download PDFInfo
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- CN113020133A CN113020133A CN202110460262.6A CN202110460262A CN113020133A CN 113020133 A CN113020133 A CN 113020133A CN 202110460262 A CN202110460262 A CN 202110460262A CN 113020133 A CN113020133 A CN 113020133A
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- soil
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- densification equipment
- carbon fiber
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- 238000000280 densification Methods 0.000 title claims abstract description 102
- 238000004140 cleaning Methods 0.000 title claims abstract description 84
- 238000001035 drying Methods 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 title claims abstract description 51
- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 40
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 40
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 239000002243 precursor Substances 0.000 title claims abstract description 38
- 229920002239 polyacrylonitrile Polymers 0.000 title claims abstract description 30
- 239000002689 soil Substances 0.000 claims abstract description 83
- 239000004744 fabric Substances 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 32
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 30
- 239000003921 oil Substances 0.000 claims description 22
- 239000008367 deionised water Substances 0.000 claims description 19
- 229910021641 deionized water Inorganic materials 0.000 claims description 19
- 239000005416 organic matter Substances 0.000 claims description 12
- 238000005201 scrubbing Methods 0.000 claims description 11
- 238000002791 soaking Methods 0.000 claims description 9
- 239000004927 clay Substances 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 11
- 239000000243 solution Substances 0.000 description 21
- 239000003795 chemical substances by application Substances 0.000 description 12
- 239000000835 fiber Substances 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000008041 oiling agent Substances 0.000 description 6
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 229910001413 alkali metal ion Inorganic materials 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000007790 scraping Methods 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 2
- 235000017491 Bambusa tulda Nutrition 0.000 description 2
- 241001330002 Bambuseae Species 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 2
- 239000011425 bamboo Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000003670 easy-to-clean Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000009987 spinning Methods 0.000 description 2
- 210000002268 wool Anatomy 0.000 description 2
- 208000007848 Alcoholism Diseases 0.000 description 1
- 206010004542 Bezoar Diseases 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 201000007930 alcohol dependence Diseases 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000004205 dimethyl polysiloxane Substances 0.000 description 1
- 238000009998 heat setting Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000120 microwave digestion Methods 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 1
- -1 polydimethylsiloxane Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- JBJWASZNUJCEKT-UHFFFAOYSA-M sodium;hydroxide;hydrate Chemical compound O.[OH-].[Na+] JBJWASZNUJCEKT-UHFFFAOYSA-M 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
-
- B08B1/143—
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
Abstract
The application provides a cleaning method of polyacrylonitrile carbon fiber precursor drying densification equipment, which comprises the following steps: applying soil on the dry densification equipment; and wiping the drying densification equipment by using the cloth to coat the soil, and removing attachments on the surface of the drying densification equipment. According to the cleaning method of the polyacrylonitrile carbon fiber precursor drying densification equipment, the cleaning effect is good, the surface of the densification equipment is not damaged, and the performances of the precursor and the carbon fiber are not influenced.
Description
Technical Field
The application belongs to the technical field of preparation of polyacrylonitrile carbon fiber precursors, and particularly relates to a cleaning method of equipment for drying and densifying the polyacrylonitrile carbon fiber precursors.
Background
At present, polyacrylonitrile carbon fiber precursor is a prerequisite for preparing high-performance carbon fiber, in the production of carbon fiber, the precursor accounts for 50% of the total cost, and poor quality and high production cost of the precursor are key factors restricting the development of carbon fiber and composite materials thereof in China. The production process flow of the polyacrylonitrile carbon fiber precursor comprises spinning, coagulating bath, washing, hot drawing, oiling, drying densification, steam drawing, relaxation heat setting and filament collection. The oil agent adopted in the oiling process is a silicon oil agent, in particular a modified oil agent taking polydimethylsiloxane as a matrix. Common modification methods include ammonia modification, ether modification, epoxy modification, and the like. Because the modified oiling agent and other organic substances existing in the oiling agent are used, the oiled fiber is subjected to heat treatment at 90-180 ℃ in a drying and densifying process, the oiling agent attached to the fiber partially falls off and is attached to a drying and densifying hot roller, the fiber runs for a period of time, a large amount of oiling agent attachments can be attached to the drying and densifying hot roller, the oiling agent attachments are high in viscosity and can be sticky, the fiber can be hairy, if the fiber is not cleaned in time, the oiling agent attachments, the wool yarns and the short yarns are adhered to the hot roller together, large-area wool yarn hairballs are accumulated, even the yarn breakage is caused, the performance, the quality and the yield of the protofilament are seriously influenced, and therefore, the drying and densifying hot roller needs to be. The adhesion of oil deposits on the surface of an object is mainly carried out in three ways: mechanical adhesion, intermolecular mechanical adhesion, chemical adhesion. The more common dry densification hot roll cleaning method therefore: (1) scrubbing with NaOH water solution, alcohol, acetone and other chemical solvents; (2) the adhered attachments are scraped off by using tools such as a thin bamboo board, a plastic shovel, a plastic card, and the like.
However, the cleaning method (1) is poor in cleaning effect, and the chemical agent residue may affect the performance of the precursor and the carbon fiber; by adopting the method (2), the cleaning effect is not good, the cleaning process is unsafe, and drying densification equipment is easy to damage, such as burrs appear on the surface of the densification equipment.
Therefore, how to provide a cleaning method of polyacrylonitrile carbon fiber precursor drying densification equipment, which has good cleaning effect, does not damage the surface of densification equipment, and does not influence the performances of precursors and carbon fibers, becomes a problem which needs to be solved by the technical personnel in the field.
Disclosure of Invention
Therefore, the technical problem to be solved by the application is to provide a cleaning method for polyacrylonitrile carbon fiber precursor drying densification equipment, the cleaning effect is good, the surface of the densification equipment is not damaged, and the performances of the precursor and the carbon fiber are not influenced.
In order to solve the problems, the application provides a cleaning method of polyacrylonitrile carbon fiber precursor drying densification equipment, which comprises the following steps:
applying soil on the dry densification equipment;
and wiping the drying densification equipment by using the cloth to coat the soil, and removing attachments on the surface of the drying densification equipment.
Preferably, the application of soil on the dry densification apparatus comprises the steps of: when the drying densification equipment is cooled to 40-50 ℃, the drying densification equipment is coated on the surface of the drying densification equipment;
and/or, the step of applying soil on the dry densification apparatus comprises the steps of: uniformly smearing and scattering soil on the part with the attachments on the drying densification equipment;
and/or the equipment for wiping, drying and densifying by coating soil with cloth comprises the following steps: and the densification equipment is wiped, dried and compacted by rubbing soil with cloth.
Preferably, the soil is obtained after being filtered by a 100-300-mesh filter screen or a sieve;
and/or, the soil comprises either or both of clay soil or loam soil;
and/or the water content of the soil is less than or equal to 20 percent, preferably the water content of the soil is less than or equal to 10 percent; more preferably, the moisture content of the soil is < 5%;
and/or the organic matter content of the soil is less than or equal to 10%, preferably the organic matter content of the soil is less than or equal to 5%, more preferably the organic matter content of the soil is less than or equal to 1%;
and/or the dry densification apparatus is a heated roll.
Preferably, after removing the attachments on the surface of the dry densification equipment, the method further comprises the following steps: and cleaning, drying and densifying equipment.
Preferably, the cleaning and drying densification apparatus comprises the steps of: and cleaning, drying and densifying equipment by adopting an alcohol solution.
Preferably, the cleaning of the dry densification equipment with the alcohol solution comprises the following steps: soaking the cloth in alcohol solution, and repeatedly scrubbing, drying and densifying the equipment by using the soaked cloth.
Preferably, the alcohol solution is a 30-40% alcohol solution.
Preferably, the cleaning and drying densification apparatus further comprises the steps of: after cleaning the dry densification equipment with an alcohol solution, the dry densification equipment is cleaned with deionized water.
Preferably, cleaning the dry densification equipment with deionized water comprises the following steps: soaking the cloth in deionized water, and repeatedly scrubbing, drying and densifying the cloth with the soaked cloth.
Preferably, the temperature of the deionized water is 25-40 ℃.
The cleaning method of polyacrylonitrile carbon fiber precursor drying densification equipment provided by the application has the advantages that the cleaning effect is good, the surface of densification equipment is not damaged, and the performances of precursor and carbon fiber are not influenced.
Drawings
FIG. 1 is a flow chart of a method for cleaning polyacrylonitrile carbon fiber precursor dry densification equipment in an embodiment of the present application;
fig. 2 is a flowchart of a cleaning method of polyacrylonitrile carbon fiber precursor drying densification equipment in the embodiment of the present application.
Detailed Description
With reference to fig. 1, the present application discloses a method for cleaning polyacrylonitrile carbon fiber precursor drying densification equipment, which comprises the following steps:
applying soil on the dry densification equipment;
and wiping the dry densification equipment by using the cloth-coated soil to remove attachments on the surface of the dry densification equipment.
At a certain temperature, applying the soil to the surface of the scrubbed dry densification equipment; then, the hot roll was lightly wiped with a soft material such as gauze to remove the oil-off material. The method can be used for cleaning and drying the oil agent fallen objects on the densification hot roller safely, reliably, quickly and efficiently, reduce the labor input, shorten the cleaning time and improve the cleaning efficiency and the cleaning effect. The cloth can be gauze, and the gauze is multilayer gauze made of pure cotton, chemical fiber or blended yarn, preferably medical gauze.
Further, the step of applying soil to the dry densification apparatus comprises the steps of: and when the drying densification equipment is cooled to 40-50 ℃, applying soil on the drying densification equipment. At the temperature, the oil solution attachment on the roller surface has strong viscosity, is sprayed on soil, is easier to adhere to the soil, and is easier to fall off by being wiped by gauze. The operation temperature of the hot roller is as high as about 100 ℃, so the hot roller can not be born by hands after being wiped at high temperature and can be born by hands after being reduced to about 40-50 ℃.
Further, the step of applying soil to the dry densification apparatus comprises the steps of: the part with attachments attached on the drying densification equipment is uniformly coated and scattered with soil, the operation is simple, and the soil and the oil agent falling objects can be bonded as soon as possible.
Further, the equipment for wiping, drying and densifying by coating soil with cloth comprises the following steps: and the densification equipment is wiped, dried and compacted by rubbing soil with cloth.
Further, the soil is obtained after being filtered by a 100-300-mesh filter screen or a sieve. Soil particles within the particle size range can be filled between the attached oil agent falling object and the oil agent falling object, so that certain friction force is easily generated and slippage is easily caused in the wiping process of using soft objects such as gauze, and the attachments on the surface of the drying densification equipment are removed.
Further, the soil comprises either or both of clay soil or loam soil; the soil is clay soil or loam soil, has certain porosity and adhesiveness, has extremely low sand content and small particle size, is beneficial to cleaning and is not easy to damage the roller surface. When the loam is adopted, pores and certain adsorbability of the loam can be utilized to coat and adhere oil agent attachments, and the oil agent attachments are wiped off by using gauze.
With reference to fig. 2, further, the water content of the soil is less than or equal to 20%, and preferably, the water content of the soil is less than or equal to 10%; more preferably, the moisture content of the soil is < 5%. The water content of the soil is less than 5 percent, the soil is dry soil, the soil is used after being filtered and aired, the broken stones, sand grains and the like in the soil need to be filtered, the gauze is soft and has certain roughness, and the gauze is used for rubbing after the surface of the oil agent falling object attached to the roller is smeared and sprinkled on the soil, so that the roller has no toxic or side effect and does not damage the surface of the roller.
Further, the organic matter content of the soil is less than or equal to 10%, preferably, the organic matter content of the soil is less than or equal to 5%, more preferably, the organic matter content of the soil is less than or equal to 1%; when the soil is dry when the water content is low and the organic quality is low, and the soil is solid powder and is easy to clean, other chemical reagents are selected to corrode and dry the surface of the densification roller easily and remain on the roller, so that the performance quality of the fiber is influenced.
Further, the drying densification equipment is a hot roller, the dry soil is filtered by a filter screen with 100-300 meshes, and particles with more than 100-300 meshes are filtered.
Further, after removing the attachments on the surface of the drying densification equipment, the method also comprises the following steps: and cleaning, drying and densifying equipment. During the cleaning process, soil and oil solution attachments attached to the dry densification equipment can be cleaned off.
Further, the cleaning and drying densification equipment comprises the following steps: and cleaning, drying and densifying equipment by adopting an alcohol solution. The equipment for cleaning, drying and densifying the roller by adopting the alcohol solution at normal temperature can clean the dry soil, organic matters and the like remained on the roller, the alcohol is volatile, and the cleaning by water is relatively simple and quick after the post-treatment after the alcohol is scrubbed.
Further, the method for cleaning, drying and densifying the equipment by using the solution alcohol comprises the following steps: soaking the cloth in alcohol solution, and repeatedly scrubbing, drying and densifying the equipment by using the soaked cloth. And scrubbing, drying and densifying equipment by adopting alcohol at normal temperature.
Further, the alcohol solution is 30-40% alcohol solution. Too high concentration alcohol has large volatilization, the standing space of people is narrow when the hot roller is scrubbed, the temperature of the hot roller is 40-50 ℃, and people are easy to suffocate and alcoholism under the conditions of high temperature and high concentration alcohol volatilization.
Further, the cleaning, drying and densifying device also comprises the following steps: after the dry densification equipment is cleaned by alcohol, the dry densification equipment is cleaned by deionized water. The dry densification hot roller is scrubbed by dry soil, alcohol and deionized water at a certain temperature in sequence. If the surface of the hot roller is found to have residual oil agent attachments after being cleaned by deionized water, the hot roller can be applied again to clean the soil repeatedly.
Further, the method for cleaning, drying and densifying equipment by adopting deionized water comprises the following steps: soaking the cloth in deionized water, and repeatedly scrubbing, drying and densifying the cloth with the soaked cloth. Residual alcohol on the drying densification equipment can be cleaned, and the influence on the protofilament can be prevented. The uncleaned dry soil and organic matters can be thoroughly cleaned by deionized water, so that all residues are cleaned, the cloth can be gauze, and the gauze can be multilayer gauze made of pure cotton, chemical fibers or blended yarns, preferably medical gauze. The gauze is selected to be soft and have certain roughness, the surface of the oil solution attachment on the drying densification equipment is smeared and sprinkled with dry soil, and then the gauze is used for rubbing, and the rubbing and acting force among the gauze, the dry soil and the oil solution attachment are used for enabling the oil solution attachment to slide and fall off.
Further, the temperature of the deionized water is 25-40 ℃. The temperature difference between the deionized water and the hot roller is not too large, and the hot water at the temperature can clean the residues more easily.
The cleaning method has the following beneficial effects:
(1) can not cause damage to the equipment. The problems that the ceramic plated on the surface of the hot roller is easy to scratch off, an internal matrix is exposed, the roller is uneven, the precision of the hot roller is reduced, and the service life is influenced in the traditional method for scraping the fallen objects are solved; and further solves the problems that the low precision of the hot roller can also influence the CV values of the original filaments at different spinning positions on the long range of the original filament on the same axis, and the quality stability of the original filament is reduced.
(2) The quality of the protofilament is not influenced. The problems that the traditional method for cleaning the fallen objects of the oil cleaning agent is easy to clean, burrs are easy to generate due to scraping by using a tool, the silk is easy to stick in the unclean place cleaned in the silk running process, and the silk bundle is damaged in the place with the burrs, so that the silk is broken and broken are solved.
(3) The cleaning time is shortened. Reduce the waste amount of the protofilament and improve the yield of the protofilament. The problems that the traditional method for scraping the fallen objects wastes manpower, the cleaning time is long, the cleaning is not thorough, the efficiency is low, and the cleaning period is short are solved. The cleaning method is convenient, rapid and efficient, can clean thoroughly, can effectively prolong the cleaning period, shortens the cleaning time, and reduces the waste of the cleaning hot roller to the protofilament.
(4) The method used by the application is safe, reliable and nontoxic, and ensures personal safety.
Example 1
The dry densification hot roller cleaning method for producing the polyacrylonitrile carbon fiber precursor comprises the following steps:
(1) filtering loam with water content of 3% and organic matter content of 1% with 200 mesh filter screen, and applying the filtered dry soil on the surface of the wiped hot roller when the temperature of the hot roller is reduced to 45 deg.C.
(2) The heat roll was repeatedly wiped with gauze to remove the deposit adhering to the heat roll.
(3) At normal temperature, the gauze is soaked in 30% alcohol solution, and then the soaked gauze is repeatedly scrubbed by a hot roller.
(4) Soaking gauze in deionized water at 25 deg.C, and repeatedly scrubbing with the soaked gauze until the gauze is cleaned.
Example 2
The dry densification hot roller cleaning method for producing the polyacrylonitrile carbon fiber precursor comprises the following steps:
(1) filtering clay soil with water content of 20% and organic matter content of 10% with 300 mesh sieve, cooling the hot roller to 50 deg.C, and applying the filtered dry soil on the surface of the hot roller.
(2) The heat roll was repeatedly wiped with gauze to remove the deposit adhering to the heat roll.
(3) At normal temperature, the gauze is soaked in 40% alcohol solution, and then the soaked gauze is repeatedly scrubbed by a hot roller.
(4) Soaking gauze in deionized water at 30 deg.C, and repeatedly scrubbing with the soaked gauze until the gauze is cleaned.
Example 3
The dry densification hot roller cleaning method for producing the polyacrylonitrile carbon fiber precursor comprises the following steps:
(1) filtering loam with water content of 10% and organic matter content of 5% with 100 mesh filter screen, cooling the hot roller to 40 deg.C, and applying the filtered dry soil onto the surface of the hot roller.
(2) The heat roll was repeatedly wiped with gauze to remove the deposit adhering to the heat roll.
(3) At normal temperature, the gauze was soaked in 35% alcohol solution and then repeatedly scrubbed with hot rolls of soaked gauze.
(4) Soaking gauze in deionized water at 40 deg.C, and repeatedly scrubbing with the soaked gauze until the gauze is cleaned.
Comparative example 1
And scraping off attached matters on the surface of the dry densification hot roller by using a thin bamboo plate.
Comparative example 2
At normal temperature, the gauze is soaked in NaOH aqueous solution, and then the soaked gauze is repeatedly scrubbed on the surface of the dry densification hot roller until attachments on the surface of the dry densification hot roller are removed.
In the cleaning methods of the polyacrylonitrile carbon fiber precursor drying densification equipment in the embodiments 1 to 3 and the comparative examples 1 to 2, the effects after cleaning are shown in the following table 1:
TABLE 1 cleaning method for dry densification equipment for polyacrylonitrile carbon fiber precursors in examples 1 to 3 and comparative examples 1 to 2 of the present application
In table 1 above: compared with the cleaning method in the prior art, the cleaning method has the advantages that the cleaning time is greatly shortened, no oil agent is left after cleaning, and the cleaning effect is good; and the surface coating of the cleaned hot roller is complete and is not damaged, and the surface of the hot roller is smooth and has no burrs. Obviously, this application cleaning method is more swift, safe high-efficient, and dry densification hot-rolling surface cleaning effect is good, and is clean burr-free, not damaged to the fibre.
Compared with the hot roller treated by the cleaning method in the prior art, the raw wires treated by the hot roller cleaned by the method have no broken wires or broken wires, and the content of alkali metal ions is slightly changed before and after the hot roller is scrubbed, wherein the slightly changed change means that the change amount is within 5 mu g/g; while the filaments in the comparison documents 1-2 become fuzzed and have a filament breakage phenomenon, and the content of alkali metal ions in the precursor filaments in the comparison document 2 is increased by 20 mug/g; and the alkali metal ions are easy to form defects in the process of preparing the carbon fiber to cause yarn breakage, so that the properties such as the strength of the carbon fiber are reduced. In the application, the alkali metal ion content is tested by microwave digestion sample preparation and icp test.
Those skilled in the art will readily appreciate that the features of the advantageous modes described above can be freely combined, superimposed without conflict.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.
Claims (10)
1. A cleaning method of polyacrylonitrile carbon fiber precursor drying densification equipment is characterized by comprising the following steps:
applying soil on said dry densification apparatus;
and wiping the dry densification equipment by using cloth to coat the soil, and removing attachments on the surface of the dry densification equipment.
2. The method for cleaning the polyacrylonitrile carbon fiber precursor dry densification equipment according to claim 1, wherein the step of coating soil on the dry densification equipment comprises the following steps: when the drying densification equipment is cooled to 40-50 ℃, soil is smeared on the surface of the drying densification equipment;
and/or, said applying soil on said dry densification apparatus comprises the steps of: uniformly smearing and scattering soil on the part with the attachments on the drying densification equipment;
and/or the dry densification equipment for coating the soil with the cloth by wiping comprises the following steps: and rubbing the soil with cloth to wipe the dry densification equipment.
3. The method for cleaning the polyacrylonitrile carbon fiber precursor drying and densifying equipment as claimed in claim 1, wherein the soil is obtained by filtering with a 100-300 mesh filter screen or sieve;
and/or, the soil comprises either or both of clay soil or loam soil;
and/or the water content of the soil is less than or equal to 20 percent, preferably the water content of the soil is less than or equal to 10 percent; more preferably, the moisture content of the soil is < 5%;
and/or the organic matter content of the soil is less than or equal to 10 percent, preferably, the organic matter content of the soil is less than or equal to 5 percent; more preferably, the organic matter of the soil is less than or equal to 1%;
and/or the dry densification apparatus is a hot roll;
and/or the attachment on the surface of the drying densification equipment comprises oil attachment, preferably, the oil attachment comprises silicon-based oil.
4. The method for cleaning the polyacrylonitrile carbon fiber precursor dry densification equipment according to claim 1, wherein after the attachments on the surface of the dry densification equipment are removed, the method further comprises the following steps: cleaning the dry densification equipment.
5. The method for cleaning the polyacrylonitrile carbon fiber precursor dry densification equipment according to claim 4, wherein the step of cleaning the dry densification equipment comprises the following steps: and cleaning the drying densification equipment by adopting an alcohol solution.
6. The method for cleaning the polyacrylonitrile carbon fiber precursor dry densification equipment as claimed in claim 5, wherein the step of cleaning the dry densification equipment by using the alcohol solution comprises the following steps: and soaking the cloth in the alcohol solution, and then repeatedly scrubbing the dry densification equipment by using the soaked cloth.
7. The method for cleaning equipment for dry densification of polyacrylonitrile carbon fiber precursor according to claim 5, wherein the alcohol solution is 30-40% alcohol solution.
8. The method for cleaning polyacrylonitrile carbon fiber precursor dry densification equipment according to claim 5, wherein the step of cleaning the dry densification equipment further comprises the following steps: cleaning the dry densification equipment with deionized water after the cleaning with an alcohol solution.
9. The method for cleaning the polyacrylonitrile carbon fiber precursor dry densification equipment as claimed in claim 8, wherein the step of cleaning the dry densification equipment by using deionized water comprises the following steps: and soaking the cloth in the deionized water, and then repeatedly scrubbing the dry densification equipment by using the soaked cloth.
10. The method for cleaning the polyacrylonitrile carbon fiber precursor dry densification equipment according to claim 8, wherein the temperature of the deionized water is 25-40 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110460262.6A CN113020133B (en) | 2021-04-27 | 2021-04-27 | Cleaning method of polyacrylonitrile carbon fiber precursor drying densification equipment |
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|---|---|---|---|
| CN202110460262.6A CN113020133B (en) | 2021-04-27 | 2021-04-27 | Cleaning method of polyacrylonitrile carbon fiber precursor drying densification equipment |
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| CN113020133A true CN113020133A (en) | 2021-06-25 |
| CN113020133B CN113020133B (en) | 2022-11-08 |
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| CN115007563A (en) * | 2022-06-13 | 2022-09-06 | 广东韶钢松山股份有限公司 | Cleaning method of continuous casting dense roller |
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| CN115007563A (en) * | 2022-06-13 | 2022-09-06 | 广东韶钢松山股份有限公司 | Cleaning method of continuous casting dense roller |
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