CN113882027A - Chitin-based product preparation method, product and structure - Google Patents
Chitin-based product preparation method, product and structure Download PDFInfo
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- CN113882027A CN113882027A CN202111290414.9A CN202111290414A CN113882027A CN 113882027 A CN113882027 A CN 113882027A CN 202111290414 A CN202111290414 A CN 202111290414A CN 113882027 A CN113882027 A CN 113882027A
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Images
Classifications
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/28—Formation of filaments, threads, or the like while mixing different spinning solutions or melts during the spinning operation; Spinnerette packs therefor
- D01D5/30—Conjugate filaments; Spinnerette packs therefor
- D01D5/34—Core-skin structure; Spinnerette packs therefor
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/10—Other agents for modifying properties
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/10—Other agents for modifying properties
- D01F1/103—Agents inhibiting growth of microorganisms
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F9/00—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments
Abstract
The invention provides a chitin-based product preparation method, a product and a structure, wherein the preparation method comprises the following steps: forming a material to be injected, wherein the material to be injected comprises: a melted or melted polymer chemical raw material and a solid material containing chitin; injecting the material to be injected to form a primary material; converting at least part of chitin in the primary material into chitosan to obtain a secondary material; forming a target product based on the secondary material.
Description
Technical Field
The invention relates to the field of material preparation, in particular to a chitin-based product preparation method, a product and a structure.
Background
In the spinning field, after the material to be injected is formed, spinning may be performed based on the material to be injected, for example, in the melt spinning field, a high temperature may be used to melt a polymer chemical raw material to form a melt, and then a desired product may be formed based on the melt (for example, by melt-blown spinning).
In the prior art, chitosan can be added during spinning, however, the cost of chitosan is high, and when the chitosan is applied to melt spinning, due to the fact that the temperature is high when the high-molecular chemical raw materials are melted, if the chitosan is added into the raw materials and melted together, the chitosan is decomposed, and the effect of the chitosan cannot be fully exerted.
Disclosure of Invention
The invention provides a preparation method of a product based on chitin, a product and a structure, which aim to solve the problem that the function of chitosan cannot be fully exerted.
According to a first aspect of the present invention, there is provided a chitin-based preparation method, comprising:
forming a material to be injected, wherein the material to be injected comprises: a melted or melted polymer chemical raw material and a solid material containing chitin;
injecting the material to be injected to form a primary material;
converting at least part of chitin in the primary material into chitosan to obtain a secondary material;
forming a target product based on the secondary material.
Optionally, converting at least part of the chitin of the primary material into chitosan to obtain a secondary material, including:
deacetylating the primary material to convert at least a portion of the chitin on the surface of the primary material to chitosan, resulting in a secondary material, wherein a non-surface portion of the secondary material comprises chitin and a surface of the secondary material comprises chitosan.
Optionally, the chitin-containing solid material comprises at least one of:
nano chitin powder;
chitin microspheres with nanopores;
a MOF porous material comprising chitin.
Optionally, the primary material contains a photocatalyst;
if the chitin-containing solid material comprises chitin microspheres with nanopores, the photocatalyst is absorbed in the pores of the chitin microspheres;
if the chitin-containing solid material comprises a porous MOF chitin-containing material, then: the photocatalyst is imbibed into the pores of the MOF porous material, or: the photocatalyst is fabricated on the MOF porous material as a coordinating material for the MOF porous structure.
Optionally, if the material to be injected is a molten material, then:
forming a material to be injected, comprising:
mixing the high molecular chemical raw materials with the solid material containing the chitin, and then adding the mixture into a screw machine to melt the high molecular chemical raw materials in the screw machine, or:
optionally, forming a material to be injected includes:
the solid material of chitin is made into a high molecular chemical raw material to form a high molecular chemical raw material containing chitin, and then the high molecular chemical raw material containing chitin is added into the screw machine.
Optionally, injecting the material to be injected to form a primary material, including:
and feeding the material to be ejected into a composite spinning assembly of a sheath-core composite fiber, so as to form a sheath-core spinning material as the primary material by using the composite spinning assembly, wherein the sheath-core spinning material comprises at least one designated filament, each designated filament comprises an inner core layer and an outer skin layer, the outer skin layer contains the solid material containing the chitin, and the inner core layer does not contain the solid material containing the chitin.
Optionally, forming a target product based on the secondary material, comprising:
forming the target product after subjecting the secondary material to a forming process, the forming process including at least one of: stretch forming, extrusion forming, plastic deformation forming, injection molding and blow molding.
According to a second aspect of the present invention, there is provided a product produced by the spinning preparation method according to the first aspect and its alternatives.
According to a third aspect of the present invention there is provided a structure comprising the product of the second aspect.
In the chitin-based product preparation method, the product and the structure, a material to be injected is formed on the basis of a spinning process, and a primary material is formed after the material to be injected is injected, wherein the primary material comprises a high-molecular chemical raw material and a solid material containing chitin; on the basis, a secondary material is formed by the conversion process of chitin and chitosan, and the secondary material can contain chitosan; furthermore, compared with the process of directly adding chitosan, the method can effectively reduce the cost, can also avoid the decomposition of the chitosan in a high-temperature environment, and fully exerts the material characteristics of the chitosan.
Specifically, compared with a scheme of respectively adding chitin and chitosan (such as a scheme of adding chitosan into raw materials and a scheme of adding chitosan into an air passage of melt-blowing equipment), the method can ensure that both the chitin and the chitosan are not decomposed, and fully exert the performances of the chitin and the chitosan. Meanwhile, compared with other schemes for realizing double addition (adding both chitosan and chitin), the method provided by the invention has the advantages that chitosan or chitin is not required to be introduced into the air passage, corresponding instruments are not required to be configured in the air passage for the chitosan or the chitin, and two raw materials of chitosan and chitin are not required to be introduced, so that the process equipment and the treatment flow are facilitated to be simplified, and the cost is reduced.
In addition, when the chitosan is converted in a deacetylation mode, the chitosan is positioned on the surface of the secondary material, and the chitin is positioned in the secondary material, so that partial characteristics (such as viscosity, film-forming property, water absorption, skin-friendly property, biocompatibility and the like) of the chitosan different from the chitin can be fully exerted, and the performance requirements of the material on external contact (such as skin and physiological structures and the like) in various application scenes are met.
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, and 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 these drawings without creative efforts.
Fig. 1 is a first schematic flow chart of a chitin-based preparation method according to an embodiment of the present invention;
FIG. 2 is a second schematic flow chart of a chitin-based preparation method according to an embodiment of the present invention;
fig. 3 is a third schematic flow chart of a chitin-based preparation method according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious 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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "upper surface", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
In the description of the present invention, "a plurality" means a plurality, e.g., two, three, four, etc., unless specifically limited otherwise.
In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected" and the like are to be construed broadly, e.g., as meaning fixedly attached, detachably attached, or integrally formed; can be mechanically connected, electrically connected or can communicate with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The technical solution of the present invention will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Referring to fig. 1, a method for preparing a product based on chitin includes:
s11: forming a material to be injected;
s12: injecting the material to be injected to form a primary material;
s13: converting at least part of chitin in the primary material into chitosan to obtain a secondary material;
s14: forming a target product based on the secondary material.
The product preparation method may be used as a spinning preparation method (e.g. melt spinning, solution spinning), may not be limited to effecting a spinning process (e.g. when used to prepare other products (e.g. consumer products), or may not be considered a spinning preparation method.
Wherein the material to be injected is formed to include: a melted or melted polymer chemical material, and a solid chitin-containing material (which does not melt or melt). It can be seen that the high molecular chemical raw material in the material to be injected can be a non-solvent solution melted by melt spinning and heating, or a solution melted by a solvent.
Wherein the high molecular chemical raw material can be artificially synthesized raw material, in particular to high molecular chemical raw material suitable for melt spinning,
if the material to be injected is a molten material, then: the chemical raw materials of the polymer generally meet the following requirements: the decomposition temperature is higher than the production temperature during melting (which can be established in the screw machine), which is higher than the melting temperature of the polymeric chemical raw material, and further, the polymeric chemical raw material can be melted without being decomposed.
The polymer chemical raw materials can be, for example (but not limited to): polypropylene PP, polyethylene terephthalate PET, polyamide PA (commonly known as nylon), polyglycolic acid PGA, polylactic-co-glycolic acid PLGA, polyvinyl chloride TPE, and the like. The polymer chemical raw material can also be a raw material for manufacturing plastic products.
Further, the polymer chemical raw material may be a modified polymer chemical raw material, for example, for PP, modified PP, that is, a raw material (for example, a raw material forming an electret mother particle) formed by combining PP and tourmaline may be adopted, which may provide a certain amount of electric charge, thereby providing a protection capability through static electricity.
Aiming at Chitin, the Chitin can be characterized as Chitin, is homopolysaccharide formed by connecting N-acetyl-2-amino 2-deoxy-D-glucose in a beta-1 and 4 glycosidic bond form, is an organic macromolecular compound which exists in nature second to cellulose, and has various characteristics.
When the polymer chemical raw material is melted, the solid material containing chitin can be kept as a solid, for example: the chitin powder can be kept in a powder state, and further, the production temperature during melting is lower than the melting temperature of the chitin, so that the chitin-containing solid material can be mixed with the high-molecular chemical raw materials when the high-molecular chemical raw materials are not melted, and the possibility of adding the chitin in other modes is not eliminated.
In one embodiment, the chitin-containing solid material comprises at least one of:
nano chitin powder;
chitin microspheres with nanopores;
a MOF porous material comprising chitin.
The MOF, particularly Metal Organic Framework, can be understood as a Metal Organic Framework material, which is a crystalline porous material having a periodic network structure formed by self-assembly of transition Metal ions and Organic ligands. The method has the advantages of high porosity, low density, large specific surface area, regular pore channels, adjustable pore diameter, diversity and tailorability of topological structures and the like.
If the chitin microspheres with nano pores and the MOF porous material containing chitin are adopted, the porous chitin microspheres and the MOF porous material containing chitin have pores, so that the porous chitin microspheres and the MOF porous material can contribute to improving the ventilation performance. In a specific scheme, the chitin powder can be nanoscale powder.
In one embodiment, the primary material comprises a photocatalyst;
if the chitin-containing solid material comprises chitin microspheres having nanopores, the photocatalyst is loaded (e.g., inhaled) into the pores of the chitin microspheres;
if the chitin-containing solid material comprises a porous MOF chitin-containing material, then: the photocatalyst is loaded (e.g., imbibed) into the pores of the MOF porous material, or: the photocatalyst is fabricated on the MOF porous material as a coordinating material for the MOF porous structure.
In one embodiment, the photocatalyst may be transferred (e.g., absorbed) into the pores of the chitin microspheres and/or the MOF porous structures before or during the formation of the material to be injected, i.e., the photocatalyst-containing chitin microspheres and/or the MOF porous structures are formed during the preparation of the raw material.
Alternatively, the photocatalyst can be added in other links, such as adding the photocatalyst into the air channel during injection; furthermore, in the porous structure of chitin microspheres and MOF, the photocatalyst can also enter the pores due to the existence of the pores.
The photocatalyst can be titanium dioxide, and other single materials or composite materials which can be used as the photocatalyst can also be adopted.
When the above schemes are applied to melt spinning, by introducing the photocatalyst (i.e. photocatalyst), the polar groups generated by photocatalysis are added on the basis of the sterilization function of a target product (such as a mask or a melt-blown cloth adopted in the mask), so that strong oxidation is achieved, organic matters such as bacteria and the like are decomposed, and stronger sterilization capability is achieved.
If the MOF porous material contains chitin and titanium dioxide, then: the MOF porous material containing chitin can be formed by coordinating nano titanium ions and chitin.
By introducing the photocatalyst, the photocatalyst effect (for example, the photocatalyst effect is formed under the condition of nanometer level) can be realized, and the gas channel sterilization effect can be realized by the photocatalyst effect of the nanometer titanium dioxide, so that the sterilization effect of the chitin can be added. Chitin is a dual identity, self-sterilizing, carrier.
Specifically, the chitin nano porous spheres (i.e., the chitin microspheres) can absorb the nano titanium dioxide (i.e., the photocatalyst), and the nano titanium dioxide can enter the nano pores in any way, so long as the nano titanium dioxide is loaded, without departing from the scope of the embodiment of the invention. Under the condition that titanium dioxide is contained in the holes, the sterilization function still has the sterilization (self-cleaning) function under the condition that no ultraviolet ray exists after being triggered by solar ultraviolet rays or artificial ultraviolet rays, the sterilization duration can be kept under the condition that no ultraviolet ray exists, the sterilization duration can be specifically adjusted according to the thickness of the coating, and the product manufactured by the principle exceeds the level of the existing titanium dioxide photocatalyst.
The MOF porous structure can be formed by coordination of metal ions and a high molecular material, the metal of the MOF porous structure does not need to be specified, and the coordination material specifies chitin, so that the MOF porous material is conveniently manufactured and then is absorbed or loaded into nano titanium dioxide. If titanium dioxide is specified to coordinate with chitin, then titanium dioxide does not need to be inhaled any more.
In the case of using chitin (and chitosan) and titanium dioxide, theoretically, the two materials have the functions together: the electron excited by the ultraviolet ray of the titanium dioxide is combined with the positive electricity of the chitin (and the chitosan) to form a strong enough positive electricity quantity, one part of the electron attracts the other part of the electron attracts the negative electricity, and the negative electron of the titanium dioxide is attracted by the strong enough positive electricity (and the chitosan), so that the titanium dioxide without the ultraviolet ray still has a positive potential cavity and still keeps the function of decomposing and sterilizing polar groups, and therefore, the two combined materials jointly play the sterilization function of decomposing bacteria.
Because the raw material and the primary material contain chitin, nano chitosan which is finer than chitosan microcrystals can be formed after conversion (such as deacetylation). If the melt-blown cloth (e.g., PP mask melt-blown cloth) is formed by the injection in step S12, the formed superfine fiber contains chitin, the diameter of the superfine fiber is generally 1 to 5 microns, after the nano-scale chitin is adopted, the PP fiber contains a large amount of chitin, and after the conversion (e.g., deacetylation), nano-chitosan which is finer than the chitosan microcrystal can be formed.
Wherein, in deacetylation, the non-surface portion of the secondary material comprises chitosan and the surface of the secondary material comprises chitosan;
furthermore, as the chitosan is positioned on the surface of the secondary material and the chitin is positioned in the secondary material, partial characteristics (such as viscosity, film-forming property, hygroscopicity, skin-friendly property and the like) of the chitosan different from the chitin can be fully exerted, and the performance requirements of the material on external contact (such as skin and physiological structures and the like) under various application scenes are met.
The decomposition temperature of chitosan (chitosan) is usually lower than the production temperature of melt spinning, and if the chitosan (chitosan) is applied to melt-blown spinning scenes, the decomposition temperature is usually lower than the temperature of high-temperature airflow, and further, if the scheme of the embodiment of the invention is not adopted, the problem of high-temperature decomposition is caused no matter how the chitosan is added.
In addition, in one example, the solid material containing chitin may be added to the melted (or melted) polymer chemical raw material, and in another example, the solid material containing chitin and the polymer chemical raw material may be mixed separately and then added to a device (e.g., a screw machine) for melting (or melting) the polymer chemical raw material; in another example, the solid chitin-containing material can be made into an unmelted (undissolved) polymer chemical material to form a chitin-containing polymer chemical material, and then the chitin-containing polymer chemical material can be added into a device (e.g., a screw machine) for melting (or dissolving) the polymer chemical material. Therefore, compared with other schemes of respectively adding chitin and chitosan (such as a scheme of adding chitosan into raw materials and a scheme of adding chitosan into an air passage of melt-blowing equipment), the method can ensure that both the chitin and the chitosan are not decomposed, and the performances of the chitin and the chitosan are fully exerted. Meanwhile, compared with other schemes for realizing double addition (adding both chitosan and chitin), the method provided by the invention has the advantages that chitosan or chitin is not required to be introduced into the air passage, corresponding equipment is not required to be configured in the air passage for the chitosan or the chitin, and two raw materials of chitosan and chitin (namely, one raw material of chitin is adopted to obtain the performances of two materials of chitin and chitosan) are not required to be introduced, so that the method is helpful for simplifying process equipment and treatment flow and reducing cost on the basis.
In one embodiment, taking melt spinning as an example, referring to fig. 2 and fig. 3, step S11 may include:
s111: and mixing the high-molecular chemical raw materials with the solid material containing the chitin, and then adding the mixture into a screw machine to melt the high-molecular chemical raw materials in the screw machine.
Correspondingly, in step S12, the melt may be first fed to the nozzle by the metering pump, and the metering pump still performs the metering function, and then the melt is injected by the nozzle, after the melt is injected, the molten polymer chemical material is solidified, and the solid material containing chitin is mixed therein.
The screw machine, the metering pump and the spray head can be realized by any existing or improved melt spinning equipment and technology in the field of melt spinning.
In another embodiment, step S11 may include:
the solid material of chitin is made into a high molecular chemical raw material to form a high molecular chemical raw material containing chitin, and then the high molecular chemical raw material containing chitin is added into the screw machine.
In one embodiment, the primary material may be a filament material or a film material, and the cross-sectional shape of the filament or the film may be arbitrary.
In another embodiment, the primary material may be a three-dimensional material having a specific three-dimensional shape formed in a mold. According to the target product to be obtained, a mould with a corresponding three-dimensional shape can be adopted or manufactured.
In step S12, melt spinning is used as an example to realize a non-solvent solution (i.e. molten polymer chemical raw material) injection, which can form a monofilament after injection, for example, by drawing several tens of holes on a circular spinneret to form a filament, or by arranging spinneret holes linearly, which can form a melt-blown fabric after injection, for example, by ejecting a melt through one or several rows of holes, which can have various cross-sectional shapes. And no changes whatsoever depart from the scope of the embodiments of the invention.
In one embodiment, the injecting the material to be injected to form a primary material includes:
and feeding the material to be ejected into a composite spinning assembly of a sheath-core composite fiber, so as to form a sheath-core spinning material as the primary material by using the composite spinning assembly, wherein the sheath-core spinning material comprises at least one designated filament, each designated filament comprises an inner core layer and an outer skin layer, the outer skin layer contains the solid material containing the chitin, and the inner core layer does not contain the solid material containing the chitin.
The composite spinning technology can ensure that a plurality of materials are gathered at an outlet and sprayed out of a hole, the temperature of each material in a respective melt cavity is different, such as two semicircles or special-shaped combination, a sheath-core type is only one, and the range of deacetylation to be removed is just controlled by utilizing the thickness of a sheath layer.
The material sprayed by the composite spinning component can be a molten material to be sprayed, can also be introduced with solidification liquid, on the basis, the material can be made into various non-woven fabrics such as needling, spunlace and the like, can also be made into filaments, does not need solidification liquid after solvation, can be used for stretching monofilaments or dozens of filaments, or more than hundreds of filaments, and can also be made into melt-blown fabrics. Therefore, the composite spinning can be applied to melt spinning and also can be applied to solution spinning.
In one embodiment, step S13 may include:
deacetylating the primary material to convert at least a portion of the chitin on the surface of the primary material to chitosan, resulting in a secondary material.
The deacetylation alkali is an example, and in other examples, the chitosan may be used in the fields of industry, medicine, etc. by degrading chitin macromolecules by fermentation, enzyme, microwave, etc.
In a further example, referring to fig. 2 and fig. 3, the step S13 may include:
s131: placing the primary material into a sodium hydroxide solution at a specified temperature, and soaking for a specified time to obtain a deacetylated material;
s132: and neutralizing, cleaning and drying the deacetylated material to obtain the secondary material.
The designated temperature and the designated time duration can be any designated parameters, and the designated temperature, the designated time duration and the concentration of the sodium hydroxide solution can be adjusted at will according to the content of the chitosan required to be formed.
On the basis, different varieties of chitosan can be formed according to the requirements. Different types of chitosan may also have further other properties, for example, a specific type of chitosan may additionally absorb heavy metals.
According to the difference of the target product to be manufactured, the corresponding process implementation can be selected in step S14.
In addition, for solid chitin-containing materials with pores (e.g., MOF porous materials, nanoporous chitin microspheres, etc.), a base (e.g., sodium hydroxide) can enter the pores sufficiently to deacetylate all the chitin into chitosan, which in turn, does not merely coat the surface of the secondary material.
In the embodiment shown in fig. 2, step S14 may include:
s141: forming the target product after performing a molding process on the secondary material;
the molding process includes at least one of: stretch forming, extrusion forming, plastic deformation forming, injection molding and blow molding. After the molding process, the formed molded product can be directly used as a target product, and can also be manufactured into the target product based on the molded product.
Taking a stretch forming process as an example, the target product can be formed by stretching the secondary material, forming a film or a filament on the secondary material, and winding; specifically, the secondary material can be stretched by adopting the existing or improved synthetic fiber filamentation and film forming technologies in the field, so that the polymer material is necked in the glass transition temperature range to achieve the improvement of strength, and then the target product is formed by winding and packaging.
In the embodiment shown in fig. 3, step S14 may include:
s142: and directly taking the secondary material as the target product.
In one example, if the primary material is meltblown and the secondary material is meltblown having chitosan on the surface and chitin inside, the meltblown fabric as the secondary material may be directly applied to a hygiene product (e.g., a mask) as a target product, for example, the meltblown fabric as the secondary material may be used as or to make an intermediate layer of the mask.
On the basis of the embodiment of the invention, the formed target products can be various, and some examples are given below, so that the process means of the embodiment of the invention can fully exert the characteristics of chitin and chitosan. Also, the scope of embodiments of the present invention is not limited to the following examples.
In a first example, the target product may be a medical suture;
taking the PGA medical suture as an example, when the process of the embodiment of the invention is not adopted, the PGA raw material has high crystallinity, the subsequent drawing cannot be well drawn and formed, and the common solving direction is to add special master batches and additives to realize the functional improvement. In the case of manufacturing the PGA medical suture line by using the process of the embodiment of the present invention, a certain proportion of chitin powder may be mixed into the PGA raw material, and after melting, after injecting a filament (i.e., after the step S11 and the step S12, the filament is a primary material), chitin on the surface may be converted into chitosan in the step S13, at this time, in this case, good viscosity and film forming property of chitosan may be sufficiently exhibited, and further, better molding may be achieved when stretching in the step S14.
As mentioned above, because the chitosan does not need to be added into the raw material, the chitosan is not decomposed, and therefore, after the process of the embodiment of the invention is adopted, the content of the chitosan can be effectively ensured to be sufficient, so that the performance of the chitosan can be fully exerted;
in addition, some PGA medical sutures have bacteria between strands and threads, which cannot solve the problems of inflammation and allergy, and thus, the processes according to the embodiments of the present invention can sufficiently exhibit anti-inflammatory and anti-allergic properties of chitosan, and meanwhile, collagen materials can be used as the medical sutures in some embodiments different from PGA medical sutures, however, the strength of such products is generally poor, and the processes according to the embodiments of the present invention can achieve both the strength and various biological properties such as anti-inflammation and anti-allergy.
Besides the PGA medical suture, the target product may be a PLGA suture, a PP suture, or the like.
In a second example, the target product can be a TPE film elastic glove, and during the use of the product, the hand of a medical worker is easy to sweat during working, and for this reason, chitosan has better hygroscopicity, which can help to prevent the sweat from affecting the operation of the medical worker;
in a third example, the target product may be a PP medical film, for example, in the treatment process of hernia, the PP medical film may be implanted into a patient, and after the process of the embodiment of the present invention is adopted, performance advantages of excellent hemolysis, affinity with human body, anti-inflammation, anti-allergy, etc. of chitosan may be fully exerted.
In a fourth example, the target product may also be a product not intended for medical use, such as a mask;
in the products directly contacted with human skin, the chitosan has the characteristics of excellent skin-friendly property, positive charge sterilization, allergy resistance and the like;
in a fifth example, the target product may be a sanitary product or a material layer for manufacturing the sanitary product, such as a mask or a middle layer of the mask, and may also be one or more material layers of surgical gowns, protective clothing, sterilization wrap, diapers, sanitary napkins, or the like;
for example, the target product can be melt-blown cloth, and further, the cloth can be directly formed after being sprayed out by a die head through high-temperature production by means of melt spinning technology.
It can be seen that in the above examples, the target product may be a hygiene product or a material product for making a hygiene product.
In another example, the target product may also be a product such as a tea cup, a bowl, a lunch box, or a product for manufacturing the tea cup, the bowl, or the lunch box. It is clear that the target product may also be a living product or a material product for making a living product.
In the above examples, when chitin and chitosan are used, positive charges of chitin and chitosan can be used to perform particle adsorption and particle repulsion functions, and the chitosan can kill microbes having negative charges on surfaces such as bacteria and viruses.
Therefore, the invention exerts some common characteristics (such as various characteristics brought by positive charges) of the chitin and the chitosan, and simultaneously, after a certain amount of the chitin and the chitosan are added into the raw materials (such as PP raw materials), the invention can also play a role of a degradation initiator, for example, when the chitin and the chitosan are applied to suture lines, the effect of initiating degradation can be fully exerted, and the processes of suture line removal and the like are avoided.
In the present invention, since chitosan is located on the surface, the properties (e.g., hemolysis, skin-friendly property, anti-inflammatory property, anti-allergic property, hygroscopicity, viscosity, film-forming property, etc.) of chitosan in external contact can be fully exerted, thereby satisfying the specific requirements of various products.
In addition, different types of chitosan may have further other performances, and the specific performances of each type of chitosan can be fully exerted under the embodiment of the invention, for example, the specific type of chitosan is additionally provided with the function of adsorbing heavy metals.
The embodiment of the invention also provides a product prepared by the preparation method related to the various schemes.
Embodiments of the present invention also provide a structure, which may be any structure in any field, including the products referred to above. The structure can be a sanitary product structure, a medical product structure, a filtering structure, a tea cup structure, a lunch box structure and the like.
In the description herein, reference to the terms "an implementation," "an embodiment," "a specific implementation," "an example" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for preparing a product based on chitin is characterized by comprising the following steps:
forming a material to be injected, wherein the material to be injected comprises: a melted or melted polymer chemical raw material and a solid material containing chitin;
injecting the material to be injected to form a primary material;
converting at least part of chitin in the primary material into chitosan to obtain a secondary material;
forming a target product based on the secondary material.
2. The product preparation method according to claim 1,
converting at least part of the chitin of the primary material into chitosan, obtaining a secondary material, comprising:
deacetylating the primary material to convert at least a portion of the chitin on the surface of the primary material to chitosan, resulting in a secondary material, wherein a non-surface portion of the secondary material comprises chitin and a surface of the secondary material comprises chitosan.
3. The product preparation method according to claim 1,
the chitin-containing solid material comprises at least one of the following:
nano chitin powder;
chitin microspheres with nanopores;
a MOF porous material comprising chitin.
4. The product manufacturing method as claimed in claim 3, wherein the primary material contains a photocatalyst;
if the solid material containing chitin comprises chitin microspheres with nano-pores, the photocatalyst is filled in the pores of the chitin microspheres;
if the chitin-containing solid material comprises a porous MOF chitin-containing material, then: the photocatalyst is loaded into the pores of the MOF porous material, or: the photocatalyst is fabricated on the MOF porous material as a coordinating material for the MOF porous structure.
5. The product preparation method according to claim 1,
if the material to be injected is a molten material, then:
forming a material to be injected, comprising:
and mixing the high-molecular chemical raw materials with the solid material containing the chitin, and then adding the mixture into a screw machine to melt the high-molecular chemical raw materials in the screw machine.
6. The product preparation method according to claim 1,
if the material to be injected is a molten material, then:
forming a material to be injected, comprising:
the solid material of chitin is made into a high molecular chemical raw material containing chitin, and then the high molecular chemical raw material containing chitin is added into a screw machine.
7. The product preparation method according to claim 1,
injecting the material to be injected to form a primary material, including:
feeding the material to be injected into a composite spinning assembly of a sheath-core composite fiber to form a sheath-core spinning material as the primary material by using the composite spinning assembly, wherein the sheath-core spinning material comprises at least one designated filament, each designated filament comprises an inner core layer and an outer skin layer, the outer skin layer comprises the solid material containing chitin, and the inner core layer does not comprise the solid material containing chitin.
8. The product preparation method according to claim 1,
forming a target product based on the secondary material, comprising:
after the secondary material is subjected to a forming process, forming the target product: the molding process includes at least one of: stretch forming, extrusion forming, plastic deformation forming, injection molding and blow molding.
9. A product produced by the method for producing a product according to any one of claims 1 to 8.
10. A structure comprising the product of claim 9.
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