CN111411525A - Fluffy fiber flocculus with local closed pore structure and preparation method thereof - Google Patents
Fluffy fiber flocculus with local closed pore structure and preparation method thereof Download PDFInfo
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- CN111411525A CN111411525A CN202010206179.1A CN202010206179A CN111411525A CN 111411525 A CN111411525 A CN 111411525A CN 202010206179 A CN202010206179 A CN 202010206179A CN 111411525 A CN111411525 A CN 111411525A
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
- D06M15/37—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06M15/564—Polyureas, polyurethanes or other polymers having ureide or urethane links; Precondensation products forming them
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/02—Natural fibres, other than mineral fibres
- D06M2101/04—Vegetal fibres
- D06M2101/06—Vegetal fibres cellulosic
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M2101/00—Chemical constitution of the fibres, threads, yarns, fabrics or fibrous goods made from such materials, to be treated
- D06M2101/16—Synthetic fibres, other than mineral fibres
- D06M2101/18—Synthetic fibres consisting of macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D06M2101/26—Polymers or copolymers of unsaturated carboxylic acids or derivatives thereof
- D06M2101/28—Acrylonitrile; Methacrylonitrile
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Abstract
The invention relates to a fluffy fiber flocculus with a local closed pore structure and a preparation method thereof. The method comprises the steps of preparing a solution with extremely dilute concentration from a flexible and elastic high-molecular polymer as a closed-cell film stock solution, uniformly introducing the solution into a fiber flocculus, curing, forming and drying to obtain a polymer film, overlapping the polymer film on a three-dimensional fiber frame, and partially closing holes among fibers to form a uniformly-distributed local closed-cell structure, so that the internal pore diameter of the fiber flocculus is reduced, air flow is blocked, a large amount of static air can be stored, heat loss caused by air flow is avoided, and the heat retention property of the fiber flocculus is effectively improved.
Description
Technical Field
The invention belongs to the technical field of non-woven, and relates to a fluffy fiber flocculus with a local closed pore structure and a preparation method thereof.
Background
High and cold weather is not only easy to cause frostbite of human body, but also easy to cause diseases of respiratory system and cardiovascular system. Therefore, there is a need to wear efficient thermal garments to resist cold weather. The existing natural fiber flocculus and synthetic fiber flocculus have the heat preservation performance from the fluffy three-dimensional structure and the porous structure, can store static air and have the heat preservation performance. However, the large pore diameter of the fiber insulating flocculus easily causes heat loss caused by air flow, so that the insulating property of the fiber flocculus is reduced. In addition, the improvement of the heat preservation performance of the fiber flocculus is mainly realized by increasing the thickness and the weight, so that the problems of heavy weight and inconvenient movement of a wearer are caused. Therefore, a local closed-cell structure needs to be constructed in the fiber flocculus, the internal pore diameter of the fiber flocculus is reduced, a large number of three-dimensional cavities are formed, a large number of static air is stored, and the heat-insulating property is greatly improved.
Some researchers weave cotton threads into honeycomb fabrics, pores of the fabrics are sealed after the self-crosslinking acrylate emulsion is sprayed, closed pores are formed, the emulsion can shrink after being dried, the fabric structure is damaged, and the fabrics are in a completely closed pore state due to spraying, so that air permeability is poor. In addition, researchers form the warm-keeping glue-spraying cotton with the mosaic structure by mixing the sponge particles formed by the closed-cell sponge with the polyester staple fibers. The method for embedding the closed-cell sponge particles into the thermal cotton can form a closed-cell structure in the thermal cotton, but the particles are easy to fall off, and the performance can be reduced.
It is therefore desirable to develop a fibrous batt having a stable closed cell structure, and a method of constructing the closed cell structure that does not damage the channel structure of the batt.
Disclosure of Invention
The invention aims to provide a fluffy fiber flocculus with a local closed pore structure and a preparation method thereof, and particularly provides a fluffy fiber flocculus with a local closed pore structure and a preparation method thereof, wherein the fluffy fiber flocculus is stable and does not damage the pore channel structure of the flocculus.
The invention aims to provide a preparation method of fluffy fiber flocculus with a local closed-cell structure, which is characterized in that a high molecular polymer is added into a solvent to prepare a solution with extremely dilute concentration as a closed-cell film stock solution; introducing a closed-pore film stock solution into the fluffy fiber flocculus through an external injection method or a vacuum negative pressure suction method to obtain a fiber flocculus containing a high molecular polymer solution inside; and curing, molding and drying the obtained fluffy fiber flocculus, wherein a polymer film is formed in the fiber flocculus by the high molecular polymer solution, is lapped on the three-dimensional fiber frame, and partially seals holes among fibers to obtain the fluffy fiber flocculus with a partially closed hole structure.
Another object of the present invention is to provide a fluffy fiber batt with a local closed-cell structure, wherein the local closed-cell structure inside the fiber batt is that the local part of the holes between fibers is closed by a polymer film, so as to reduce the internal pore diameter of the fiber batt, block air flow, facilitate storage of a large amount of still air, avoid heat loss caused by air flow, and effectively improve the heat retention property of the fiber batt. After the polymer solution is introduced into the fiber flocculus, in the process of curing and drying, the solvent in the curing solution is removed, and the polymer film formed in situ is overlapped on the fiber frame, so that the damage to the internal structure of the fiber flocculus can be avoided.
The fluffy fiber flocculus with the local closed-cell structure is characterized in that a polymer film for locally closing holes is lapped on a fiber frame of the fluffy fiber flocculus; i.e. said to have a locally closed cell structureThe fluffy fiber flocculus internally contains a polymer film which is lapped on a fiber frame, and the local part of the holes in the fluffy fiber flocculus is sealed to form a local closed hole structure which is uniformly distributed; the coverage rate of the polymer film in the fiber flocculus is more than 60 percent, the minimum aperture in the fiber flocculus is as low as 5-10 mu m, and the thermal resistance value is 0.8-1.0 m2K/W is improved by more than 20 percent compared with the common fiber flocculus.
As a preferred technical scheme:
the fluffy fiber flocculus with the local closed-cell structure is characterized in that the thickness of the polymer film is 50-200 nm; the polymer film is one of a water-based polyurethane film, a soft polyacrylate film, a thermoplastic polyurethane film, a polytetrafluoroethylene film and a thermoplastic polyester film.
The fluffy fiber flakes having a partially closed cell structure as described above are natural fiber flakes, synthetic fiber flakes or natural/synthetic composite fiber flakes. Wherein the natural fiber is one or more of cotton, kapok, hemp, wood pulp, bamboo pulp, wool, silk, wood, chitin, collagen and silk fibroin; the synthetic fiber is polylactic acid-caprolactone, polyethylene oxide, polyvinyl alcohol, polyvinyl butyral, phenolic resin, polyacrylic acid, polyvinylidene fluoride, polypyrrolidone, polylactic acid, polylactic glycolic acid, polysulfone, polyethylene diyne, polystyrene copolymerized maleic anhydride, polymethyl triethoxy silane, polyglutamic acid, polycaprolactone, poly (p-phenylene vinylether), poly (glycolide), polyurethane, polystyrene, polyacrylonitrile, polyvinyl acetate, polypropylene, polyethylene glycol, polyacrylamide, polyethylene, polyvinyl chloride, polydioxanone, poly (trihydroxybutyrate), polyhydroxybutyrate, polycarbonate, polyimide, polyetherimide, polybenzimidazole, polybenzoxazine, poly (p-phenylene terephthalamide), poly (ethylene terephthalate), poly (trimethylene terephthalate), polymethyl methacrylate, poly (methyl methacrylate), poly (propylene glycol terephthalate), poly (ethylene glycol terephthalate), poly (propylene terephthalate), poly (ethylene glycol terephthalate, Polyether ether ketone, polyvinylidene fluoride, polyethylene oxide, polyvinyl carbazole, polyvinylidene fluoride, polyamide, polyaniline, polyaramide, polybutylene succinate and polybutylene terephthalate-co-succinate in one or more combinations.
The fluffy fiber flocculus with the local closed-cell structure has the thickness of 5-30 mm, the compression resilience rate of more than 90% and the porosity of more than 95%.
The invention also provides a method for preparing the fluffy fiber flocculus with the local closed-cell structure, which comprises the following steps:
the first step is as follows: adding a high molecular polymer into a solvent, and uniformly stirring to prepare a solution with extremely dilute concentration as a closed pore film stock solution;
the second step is that: uniformly introducing the high molecular polymer solution into the fluffy flocculus to obtain fluffy fiber flocculus containing the high molecular polymer solution inside;
the third step: solidifying and molding the obtained fiber flocculus to obtain a fiber flocculus solidified block;
the fourth step: and drying the fiber flocculus solidified block, removing the solvent of the solidified high molecular polymer solution during drying treatment to form a polymer film which is overlapped on the three-dimensional fiber frame, and obtaining the fluffy fiber flocculus with the local closed-cell structure.
In the method, the high molecular polymer is one of waterborne polyurethane, soft polyacrylate, thermoplastic polyurethane, polytetrafluoroethylene and thermoplastic polyester; the solvent is more than one of water, N-dimethylformamide, N-dimethylacetamide, acetone, chloroform, cresol, dimethyl sulfoxide, methanol, ethanol, propanol, isopropanol, butanol, isobutanol, toluene, N-methylpyrrolidone and methyl ethyl ketone.
As mentioned above, the very dilute concentration refers to a concentration of the high molecular weight polymer of less than 2 wt%. The concentration of the high molecular polymer is controlled in a lower range because the fiber flocculus has the heat preservation function and light and air permeability in the actual use process, the concentration of the high molecular solution is controlled in the lower range, so that a thin high molecular polymer microporous membrane is favorably formed, the air permeability of the fiber flocculus material is ensured while a local closed pore structure is formed, and the comfort in the use process is also ensured.
As mentioned above, the method for introducing the high molecular polymer solution into the fiber flocculus is an external injection method or a vacuum negative pressure suction method. Wherein, the external injection adopts an injection pump for injection, and the running speed is 8-10 mm/min; the vacuum negative pressure suction method is to pump the polymer solution into the fiber flocculus in a vacuum environment, wherein the vacuum degree is required to be less than 300 Pa.
The preparation method of the fluffy fiber flakes with the local closed-cell structure is that the solidification forming method is a gelation treatment or a freezing treatment; wherein the gelation treatment temperature is 15-30 ℃, and the treatment time is 10-20 h; the freezing treatment temperature is-196 to-40 ℃, and the treatment time is 10 to 20 min.
A method for preparing the fluffy fiber flakes with the local closed-cell structure, wherein the drying method is one of atmospheric pressure (one standard atmospheric pressure) drying, supercritical drying, vacuum drying and freeze drying;
the drying temperature under normal pressure is 70-150 ℃, and the drying time is 0.5-2 h;
the supercritical drying temperature is CO2Is a drying medium, the treatment time is 40-80 ℃, the air pressure is 15-25 MPa, and the drying time is 2-2.5 h;
the vacuum drying temperature is 60-100 ℃, the treatment time is 0.5-1.5 h, and the vacuum degree is below 200 Pa;
the freeze drying temperature is below-15 ℃, the processing time is 12-24 h, and the vacuum degree is below 100 Pa.
After the high molecular polymer solution is introduced into the fluffy fiber flocculus, the high molecular polymer solution is uniformly distributed in pores in the flocculus, and then solidification molding is carried out through gelation or freezing treatment; wherein the adopted gelation treatment makes the solution become viscous to form a non-flowing gel with certain elasticity, and polymer molecular chains in the solution are aggregated and crosslinked；Or freezing to form ice crystal, extruding and aggregating polymer molecular chain to form network structure, drying to remove the solidified solvent, and forming film lap jointOn a fiber framework.
In the process of curing and forming the high molecular polymer solution in the fluffy fiber batting, high molecular chains are gathered and tangled under the action of external force, are lapped on a fiber frame, and are dried to form the high molecular polymer film. The realization of the process requires that the polymer molecular chain and the fiber frame have size adaptability, so that the polymer film is usually formed near the fiber cross point with smaller fiber spacing, and the fibers are mutually overlapped to form part of meshes to be closed to form a local closed pore structure, thereby reducing the aperture of the fiber frame, reducing the air flow, being beneficial to storing a large amount of static air and avoiding the heat dissipation of a human body.
Advantageous effects
(1) Due to the existence of the local closed pore structure, the minimum pore diameter of the internal pore diameter of the fluffy fiber flocculus is as low as 5-10 mu m, so that the air flow is blocked, the fluffy fiber flocculus is favorable for storing a large amount of static air, the heat loss caused by the air flow is effectively avoided, and the thermal resistance value reaches 0.8-1.0 m2K/W is improved by more than 20 percent compared with the common fiber flocculus, and the heat retention property is obviously improved;
(2) according to the preparation method, the polymer solution in the fiber flocculus is solidified, molded and dried, the polymer film is formed in situ in the fiber flocculus, the damage to the internal structure is avoided, and meanwhile, the coverage rate of the polymer film in the fiber flocculus can reach more than 60%.
Drawings
FIG. 1 is an electron micrograph of a lofty fibrous batt of the present invention having a partially closed cell structure;
FIG. 2 is an electron micrograph of a polymeric film of the present invention lapped over a fibrous framework.
Detailed Description
The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
As shown in fig. 1 and 2, the fluffy fiber flocculus with a local closed-cell structure of the present invention has a polymer film for locally closing the cells lapped on the fiber frame of the fluffy fiber flocculus; the fluffy fiber flocculus with the local closed pore structure internally contains a polymer film lapped on a fiber frame, and the local of the pores in the fiber flocculus is closed to form the local closed pore structure which is uniformly distributed; the coverage rate of the polymer film in the fiber flocculus is more than 60 percent, the minimum aperture is as low as 5-10 mu m, and the thermal resistance value can reach 0.8-1.0 m2K/W is improved by more than 20 percent compared with the common fiber flocculus.
The thickness of the polymer film is 50-200 nm. The polymer film is one of a water-based polyurethane film, a soft polyacrylate film, a thermoplastic polyurethane film, a polytetrafluoroethylene film and a thermoplastic polyester film.
The fluffy fiber flocculus is a natural fiber flocculus, a synthetic fiber flocculus or a natural/synthetic composite fiber flocculus. Wherein the natural fiber is one or more of cotton, kapok, hemp, wood pulp, bamboo pulp, wool, silk, wood, chitin, collagen and silk fibroin. The synthetic fiber is polylactic acid-caprolactone, polyethylene oxide, polyvinyl alcohol, polyvinyl butyral, phenolic resin, polyacrylic acid, polyvinylidene fluoride, polypyrrolidone, polylactic acid, polylactic glycolic acid, polysulfone, polyethylene diyne, polystyrene copolymerized maleic anhydride, polymethyl triethoxy silane, polyglutamic acid, polycaprolactone, poly (p-phenylene vinylether), poly (glycolide), polyurethane, polystyrene, polyacrylonitrile, polyvinyl acetate, polypropylene, polyethylene glycol, polyacrylamide, polyethylene, polyvinyl chloride, polydioxanone, poly (trihydroxybutyrate), polyhydroxybutyrate, polycarbonate, polyimide, polyetherimide, polybenzimidazole, polybenzoxazine, poly (p-phenylene terephthalamide), poly (ethylene terephthalate), poly (trimethylene terephthalate), polymethyl methacrylate, poly (methyl methacrylate), poly (propylene glycol terephthalate), poly (ethylene glycol terephthalate), poly (propylene terephthalate), poly (ethylene glycol terephthalate, Polyether ether ketone, polyvinylidene fluoride, polyethylene oxide, polyvinyl carbazole, polyvinylidene fluoride, polyamide, polyaniline, polyaramide, polybutylene succinate and polybutylene terephthalate-co-succinate in one or more combinations.
The thickness of the fluffy fiber flocculus is 5-30 mm, the compression rebound rate is more than 90%, and the porosity is more than 95%.
Example 1
The invention relates to a preparation method of a fluffy fiber flocculus with a local closed pore structure, which comprises the following preparation steps:
the first step is as follows: adding waterborne polyurethane into water, and uniformly stirring to prepare a solution serving as a closed-cell film stock solution, wherein the concentration of the solution is 1.5 wt%;
the second step is that: injecting an extremely dilute aqueous polyurethane solution into a cotton fiber flocculus with the thickness of 20mm, the compression resilience rate of 90% and the porosity of 95% at the speed of 8.5mm/min by using an injection pump to obtain the cotton fiber flocculus internally containing the aqueous polyurethane solution;
the third step: freezing and molding the obtained fiber flocculus for 10min at-150 ℃ to obtain a fiber flocculus solidified block;
the fourth step: and (3) freeze-drying the obtained fiber flocculus solidified block at-40 ℃ under the vacuum degree of 90Pa, drying the solidified aqueous polyurethane solution in the fiber flocculus to form a polyurethane film, overlapping the polyurethane film on a three-dimensional fiber frame, and partially sealing the pore structure to obtain the cotton fiber flocculus with the partially closed pore structure.
The cotton fiber flocculus with the local closed pore structure has the minimum internal pore diameter of 9 mu m and the thermal resistance value of 0.82m2K/W。
Comparative example 1
The difference between the ordinary cotton fiber flocculus and the fluffy fiber flocculus with the local closed pore structure prepared in the embodiment 1 is that the ordinary cotton fiber flocculus is not subjected to local closed pore treatment, the micron-sized cotton fibers enable the ordinary cotton fiber flocculus to have larger pore size within the range of 40-60 mu m, the larger pore size inside the ordinary cotton fiber flocculus is beneficial to air flow, so that heat is dissipated, and the thermal resistance value of the ordinary cotton fiber flocculus is only 0.5m2K/W; example 1 Cotton batts were partially closed-cell treated on fibrous frameworkThe polymer film is lapped, the inner pore diameter of the flocculus is reduced, a large amount of static air can be stored, the heat loss caused by air flow is avoided, and compared with the comparative example 1, the thermal resistance value of the fiber flocculus is improved by nearly 60%.
Example 2
The invention relates to a preparation method of a fluffy fiber flocculus with a local closed pore structure, which comprises the following preparation steps:
the first step is as follows: adding thermoplastic polyurethane into N, N-dimethylformamide, and uniformly stirring to prepare a solution serving as a closed-cell film stock solution, wherein the concentration of the solution is 1.8 wt%;
the second step is that: pumping thermoplastic polyurethane solution with extremely dilute concentration into a polyacrylonitrile fiber flocculus with the thickness of 23mm, the compression rebound rate of 92% and the porosity of 96% under the vacuum negative pressure of 200Pa to obtain the polyacrylonitrile fiber flocculus containing the thermoplastic polyurethane solution inside;
the third step: gelatinizing the obtained fiber flocculus at 20 ℃ for 15h, and gelatinizing the solution in the fiber flocculus to obtain a solidified block;
the fourth step: and drying the obtained fiber flocculus solidified block under normal pressure at the temperature of 80 ℃, drying the gelatinized thermoplastic polyurethane in the fiber flocculus to form a thermoplastic polyurethane film which is lapped on a three-dimensional fiber frame, and partially closing the pore structure to obtain the polyacrylonitrile fiber flocculus with the partially closed pore structure.
The minimum pore diameter of the internal pore diameter of the polyacrylonitrile fiber flocculus with the local closed pore structure is 7 mu m, and the thermal resistance value is 0.90m2K/W。
Comparative example 2
The common polyacrylonitrile fiber flocculus is structurally different from the fluffy fiber flocculus with the local closed-pore structure prepared in the embodiment 2 in that the common polyacrylonitrile fiber flocculus is obtained by carding, lapping and reinforcing polyacrylonitrile fibers, internal fibers are mutually overlapped to form a pore structure with a larger diameter, the range is 20-30 mu m, the structure is beneficial to the flow of air in the fiber flocculus, so that heat loss is caused, and the thermal resistance value of the structure is only 0.61m2K/W；In the embodiment 2, the polyacrylonitrile fiber flocculus is subjected to local pore closing treatment, the polymer film is lapped on the fiber frame, the internal pore diameter of the flocculus is reduced, a large amount of static air can be stored, the heat loss caused by air flow is avoided, and compared with the comparative example 2, the thermal resistance of the flocculus is improved by nearly 50%.
Claims (10)
1. A lofty fibrous batting having a partially closed cell structure characterized by: the fluffy fiber flocculus with the local closed pore structure is a fiber frame of the fluffy fiber flocculus, and a polymer film for locally closing the pores is lapped on the fiber frame; the coverage rate of the polymer film in the fiber flocculus is more than 60 percent, the minimum aperture in the fiber flocculus is as low as 5-10 mu m, and the thermal resistance value is 0.8-1.0 m2K/W is improved by more than 20 percent compared with the common fiber flocculus.
2. The lofty fibrous batting having a partially closed cell structure according to claim 1, wherein the polymeric film has a thickness of 50 to 200 nm; the polymer film is one of a water-based polyurethane film, a soft polyacrylate film, a thermoplastic polyurethane film, a polytetrafluoroethylene film and a thermoplastic polyester film.
3. The lofty fibrous batting having a partially closed cell structure of claim 1, wherein the lofty fibrous batting is a natural fibrous batting, a synthetic fibrous batting, or a natural/synthetic composite fibrous batting.
4. The fluffy fiber batt of claim 1 having a partially closed cell structure, wherein the fluffy fiber batt has a thickness of 5 to 30mm, a compression resilience of 90% or more, and a porosity of 95% or more.
5. A process for preparing a lofty fibrous batting having a partially closed cell structure according to any one of claims 1 to 4, characterized by: the method comprises the following steps:
the first step is as follows: adding a high molecular polymer into a solvent, and uniformly stirring to prepare a solution with extremely dilute concentration as a closed pore film stock solution;
the second step is that: uniformly introducing the high molecular polymer solution into the fluffy flocculus to obtain fluffy fiber flocculus containing the high molecular polymer solution inside;
the third step: solidifying and molding the obtained fiber flocculus to obtain a fiber flocculus solidified block;
the fourth step: and drying the fiber flocculus solidified block, removing the solvent of the solidified high molecular polymer solution during drying treatment to form a polymer film which is overlapped on the three-dimensional fiber frame, and obtaining the fluffy fiber flocculus with the local closed-cell structure.
6. The method according to claim 5, wherein the high molecular polymer is one of aqueous polyurethane, soft polyacrylate, thermoplastic polyurethane, polytetrafluoroethylene and thermoplastic polyester; the solvent is more than one of water, N-dimethylformamide, N-dimethylacetamide, acetone, chloroform, cresol, dimethyl sulfoxide, methanol, ethanol, propanol, isopropanol, butanol, isobutanol, toluene, N-methylpyrrolidone and methyl ethyl ketone.
7. The method of claim 5, wherein the very dilute concentration is a concentration of less than 2 wt% of the high molecular weight polymer.
8. The method according to claim 5, wherein the method for uniformly introducing the high molecular polymer solution into the interior of the fiber flocculus is an external injection method or a vacuum negative pressure suction method; wherein, the external injection adopts an injection pump for injection, and the running speed is 8-10 mm/min; the vacuum negative pressure suction method is to pump the polymer solution into the fiber flocculus in a vacuum environment, wherein the vacuum degree is required to be less than 300 Pa.
9. The method according to claim 5, wherein the solidification molding method is a gelation treatment or a freezing treatment; wherein the gelation treatment temperature is 15-30 ℃, and the treatment time is 10-20 h; the freezing treatment temperature is-196 to-40 ℃, and the treatment time is 10 to 20 min.
10. The method of claim 5 wherein the drying process is one of atmospheric drying, supercritical drying, vacuum drying, and freeze drying;
the drying temperature under normal pressure is 70-150 ℃, and the drying time is 0.5-2 h;
said supercritical drying is with CO2Is a drying medium, the treatment time is 40-80 ℃, the air pressure is 15-25 MPa, and the drying time is 2-2.5 h;
the vacuum drying temperature is 60-100 ℃, the treatment time is 0.5-1.5 h, and the vacuum degree is below 200 Pa;
the freeze drying temperature is below-15 ℃, the processing time is 12-24 h, and the vacuum degree is below 100 Pa.
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