CN112315118A - Polyurethane foaming insole added with wormwood extract and preparation method thereof - Google Patents
Polyurethane foaming insole added with wormwood extract and preparation method thereof Download PDFInfo
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- CN112315118A CN112315118A CN202011194218.7A CN202011194218A CN112315118A CN 112315118 A CN112315118 A CN 112315118A CN 202011194218 A CN202011194218 A CN 202011194218A CN 112315118 A CN112315118 A CN 112315118A
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- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B17/00—Insoles for insertion, e.g. footbeds or inlays, for attachment to the shoe after the upper has been joined
- A43B17/003—Insoles for insertion, e.g. footbeds or inlays, for attachment to the shoe after the upper has been joined characterised by the material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
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Abstract
The invention discloses a polyurethane foaming insole added with wormwood extract and a preparation method thereof, wherein the polyurethane foaming insole added with wormwood extract is divided into a base layer and a surface layer; the base layer is a polyurethane foaming material added with the wormwood extract I; the surface layer is an improved fabric treated by the wormwood extract II. According to the polyurethane foaming insole added with the wormwood extract and the preparation method thereof, the antibacterial and damp-clearing effects of the wormwood are fully utilized, the antibacterial performance of the wormwood is improved, and the advantages of long-acting release and good wearing comfort are realized; the wormwood active ingredients are embedded in the sodium alginate cross-linked body, and the antibacterial ingredients are slowly released in the base layer, so that the release time of the antibacterial performance of the polyurethane foaming insole is prolonged, and the wearing comfort of the polyurethane foaming insole is ensured.
Description
Technical Field
The invention belongs to the technical field of insole materials, and relates to a polyurethane foaming insole added with a wormwood extract and a preparation method thereof.
Background
The polyurethane foaming insole has the advantages of high resilience and wear resistance, has good wearing experience, and is a common material for high-end insoles. In addition, the preparation process of the polyurethane foaming insole is relatively mature and has higher production efficiency. Therefore, the innovation of the product formula and the production process of the polyurethane foaming insole is concerned widely.
The polyurethane foaming insole is in contact with the sole of the foot for a long time, so that bacteria and fungi are easily bred, the insole is deteriorated, and the poor body feeling of a wearer is further caused. Therefore, the antibacterial performance of the polyurethane foaming insole is improved, the wearing comfort of the polyurethane foaming insole is enhanced, and the improvement of the polyurethane foaming insole is an important direction.
At present, in order to improve the bacteriostatic performance of polyurethane foaming insoles, the common means comprise: (1) the surface of the polyurethane foaming insole adopts a fabric with antibacterial performance, but the method has the problems of common antibacterial effect and rapid reduction of the antibacterial performance after being worn for many times; (2) the organic/inorganic antibacterial agent is added into the base material of the polyurethane foaming insole, but the method has the problem of poor wearing comfort; (3) the method is characterized in that a filling cavity is formed in the polyurethane foaming insole, the antibacterial material is filled into the filling cavity, and then the filling cavity is attached and compounded, so that the insole is poor in comfort, short in antibacterial timeliness and easy to lose effectiveness.
The wormwood is a common perennial herb, has good antibacterial performance, and is usually used directly or crushed. However, the effective components of the wormwood have poor persistence, are easy to dissipate and are not easy to release for a long time.
Therefore, in view of the above problems, it is desirable to provide a polyurethane foamed insole which is improved by fully utilizing the antibacterial and dampness-removing effects of wormwood, so as to improve the antibacterial performance of wormwood, and realize the advantages of long-acting release and good wearing comfort.
Disclosure of Invention
In order to achieve the purpose, the invention provides the polyurethane foaming insole added with the wormwood extract and the preparation method thereof, so that the antibacterial and damp-clearing effects of the wormwood are fully utilized, the antibacterial performance of the wormwood is improved, and the advantages of long-acting release and good wearing comfort are realized.
The technical scheme adopted by the invention is that the polyurethane foaming insole added with the wormwood extract is divided into a base layer and a surface layer; the base layer is a polyurethane foaming material added with the wormwood extract I; the surface layer is an improved fabric treated by the wormwood extract II.
According to the polyurethane foaming insole added with the wormwood extract, the wormwood extract I is added into the base layer, the fabric of the surface layer is improved by the wormwood extract II, the antibacterial performance of the polyurethane foaming insole is further improved due to double treatment of effective antibacterial ingredients of the wormwood on the materials of the surface layer and the base layer, the effective service time of the polyurethane foaming insole is obviously prolonged due to slow release of the effective antibacterial ingredients of the wormwood, the market share of the antibacterial polyurethane foaming insole is further improved, and meanwhile, due to treatment of the effective antibacterial ingredients of the wormwood on the surface layer, the fabric slowly releases the antibacterial ingredients for a long time, and has an effective health care effect on feet of a human body.
Further, the preparation method of the wormwood extract I comprises the following steps:
crushing the dried wormwood, carrying out water extraction or alcohol extraction treatment, and carrying out spray drying treatment on the obtained product to obtain a wormwood water extract or wormwood alcohol extract;
adding the wormwood water extract or the alcohol extract into the calcium salt solution, uniformly mixing, adding the sodium alginate aqueous solution, and drying to obtain a precursor;
and crushing and sieving the precursor to obtain the wormwood extract.
The wormwood extract I is prepared by mixing wormwood extract particles obtained by spray drying with a calcium salt solution, adding a sodium alginate aqueous solution, utilizing the contact of the calcium salt and the sodium alginate to generate sodium alginate crosslinked gel, embedding wormwood extract substances into the sodium alginate crosslinked gel in situ, drying, crushing and sieving to obtain refined wormwood extract powder.
Further, the concentration of calcium salt is: 0.01mol/L to 0.5 mol/L.
Wherein the concentration of the calcium salt is preferably 0.01 mol/L-0.5 mol/L, and exceeds 0.5mol/L, and the crosslinking reaction with the sodium alginate is too rapid, which causes the problem that the distribution of the wormwood extract in the crosslinked gel is not uniform.
Furthermore, the concentration of the sodium alginate aqueous solution is 0.05 mol/L-0.25 mol/L.
Wherein, the concentration of the sodium alginate aqueous solution is preferably 0.05 mol/L-0.25 mol/L, which is lower than 0.05mol/L, the embedding property of the wormwood extract component is not good, which is higher than 0.25mol/L, the crosslinking reaction with the calcium salt solution is too rapid, which causes the problem of uneven distribution of the wormwood extract component in the crosslinked gel
Further, the screen was 400 mesh.
The sieving mesh number is preferably 400 meshes, the sieving mesh number is less than 400 meshes, the particle size of the obtained wormwood extract is too coarse, the compatibility with polyurethane preparation raw materials is too poor, the mechanical property and the antibacterial property of the polyurethane foaming insole are influenced, the particle size of the wormwood extract is too fine when the sieving mesh number is more than 400 meshes, the embedding property of wormwood active ingredients is poor, and the slow release performance is poor.
Further, the preparation method of the wormwood extract II comprises the following steps:
crushing the dried wormwood, and carrying out water extraction or alcohol extraction treatment to obtain wormwood water extract or wormwood alcohol extract;
and carrying out spray drying treatment on the obtained wormwood water extract or wormwood alcohol extract to obtain a wormwood extract II.
Further, the preparation method of the surface layer comprises the following steps:
adding the wormwood extract II into the viscose, and fully mixing to obtain a spinning stock solution;
the obtained spinning solution is sprayed out to be hollow spun through two concentric spinneret orifices;
the method can improve the effective component of the wormwood to the hollow fiber and improve the bacteriostatic performance of the hollow fiber, and the fabric made of the fiber is soft and comfortable because the fiber is hollow, thereby improving the product property of the fabric.
Soaking the obtained hollow spinning in an alcoholic solution of wormwood extract II with the concentration of 0.001-0.003 mol/L, and preserving the temperature at 40-50 ℃ for 30-60 min to obtain improved fiber;
the hollow spinning is soaked in the alcohol solution of the wormwood extract II, the hollow inner cavity of the fiber is soaked with the wormwood active ingredient, after post-treatment, the slow release of the wormwood active ingredient in the hollow fiber is realized, the purpose of improving the bacteriostatic timeliness of the insole is further achieved, and meanwhile, the comfort of the surface layer material prepared by the fabric is high.
Weaving the obtained modified fiber to obtain the modified fabric treated by the wormwood extract II as a surface layer material.
The invention also provides a preparation method of the polyurethane foaming insole added with the wormwood extract, which comprises the following steps:
s1: weighing 100-105 parts by weight of polyester polyol with the molecular weight of 3000-3500 and 2-15 parts by weight of wormwood extract I under a vacuum condition, putting into a reaction kettle at normal temperature, and uniformly stirring to obtain a component A;
s2: weighing 15-20 parts by weight of polyester polyol with the molecular weight of 5500-7000, putting the polyester polyol into a reaction kettle at normal temperature, heating to 95-100 ℃, degassing and removing glue for 1-1.5 h, then cooling to 55 ℃, putting 80 parts by weight of diisocyanate, heating to 75-80 ℃, and reacting for 1-1.5 h to obtain a component B;
s3: respectively injecting the component A and the component B into a material tank, mixing at a machine head, injecting into an insole forming mold, closing the mold, carrying out hot press forming treatment for 200-300 s at the temperature of 50-55 ℃, and carrying out mold opening, cooling and cutting to obtain a base layer of the polyurethane foaming insole added with the wormwood extract;
s4: and (3) carrying out hot-pressing compounding on the modified fabric treated by the wormwood extract II as a surface layer material and the base layer of the polyurethane foaming insole added with the wormwood extract obtained in the step S3 to obtain the polyurethane foaming insole added with the wormwood extract.
The preparation method does not increase the difficulty of a polyurethane foaming process, but also ensures the uniform mixing of the wormwood extract and the polyester polyol, ensures the uniform distribution of wormwood active ingredients in the base layer, and because the wormwood active ingredients are embedded in the sodium alginate cross-linked body, the antibacterial ingredients are slowly released in the base layer, the release time of the antibacterial performance of the polyurethane foaming insole is prolonged, and the wearing comfort of the polyurethane foaming insole is ensured.
The invention has the beneficial effects that:
(1) the invention provides a polyurethane foaming insole added with a wormwood extract and a preparation method thereof, which fully utilize the antibacterial and dampness-removing effects of wormwood, improve the antibacterial performance of wormwood, and realize the advantages of long-acting release and good wearing comfort.
(2) The preparation method of the wormwood extract I comprises the steps of mixing wormwood extract particles obtained through spray drying with a calcium salt solution, adding a sodium alginate aqueous solution, utilizing the fact that the calcium salt is in contact with the sodium alginate to generate sodium alginate crosslinked gel, embedding wormwood extract substances into the sodium alginate crosslinked gel in situ, drying, crushing and sieving to obtain refined wormwood extract powder.
(3) The wormwood active ingredients are embedded in the sodium alginate cross-linked body, and the antibacterial ingredients are slowly released in the base layer, so that the release time of the antibacterial performance of the polyurethane foaming insole is prolonged, and the wearing comfort of the polyurethane foaming insole is ensured.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.
The invention discloses a polyurethane foaming insole added with a wormwood extract, which is divided into a base layer and a surface layer; the base layer is a polyurethane foaming material added with the wormwood extract I; the surface layer is an improved fabric treated by the wormwood extract II.
Example 1
The invention discloses a preparation method of a wormwood extract I, which comprises the following steps:
crushing the dried wormwood, carrying out water extraction or alcohol extraction treatment, and carrying out spray drying treatment on the obtained product to obtain a wormwood water extract or wormwood alcohol extract;
adding the wormwood water extract or the alcohol extract into a calcium salt solution with the concentration of 0.01mol/L, uniformly mixing, adding a sodium alginate water solution with the concentration of 0.05mol/L, and drying to obtain a precursor;
and crushing the precursor, and sieving with a 400-mesh sieve to obtain the wormwood extract.
Example 2
The concentration of the decalcified salt solution was 0.5mol/L, and the concentration of the sodium alginate aqueous solution was 0.25mol/L, and the rest was the same as in example 1.
Example 3
The concentration of the decalcified salt solution was 0.1mol/L, and the concentration of the sodium alginate aqueous solution was 0.2mol/L, and the rest was the same as in example 1.
Example 4
The invention discloses a preparation method of a wormwood extract II, which comprises the following steps: crushing the dried wormwood, and carrying out water extraction or alcohol extraction treatment to obtain wormwood water extract or wormwood alcohol extract; and carrying out spray drying treatment on the obtained wormwood water extract or wormwood alcohol extract to obtain a wormwood extract II.
Example 5
The invention discloses a preparation method of a surface layer, which comprises the following steps:
adding the wormwood extract II into the viscose, and fully mixing to obtain a spinning stock solution;
the obtained spinning solution is sprayed out to be hollow spun through two concentric spinneret orifices;
soaking the obtained hollow spinning fiber in 0.001mol/L alcohol solution of folium Artemisiae Argyi extract II, and keeping the temperature at 40 deg.C for 30min to obtain modified fiber;
weaving the obtained modified fiber to obtain the modified fabric treated by the wormwood extract II as a surface layer material.
Example 6
The concentration of the alcoholic solution except the wormwood extract II is 0.003 mol/L; the incubation was carried out at 50 ℃ for 60min, the rest being the same as in example 5.
Example 7
The concentration of the alcoholic solution except the wormwood extract II is 0.002 mol/L; the incubation was carried out at 45 ℃ for 45min, the rest being the same as in example 5.
Example 8
A preparation method of a polyurethane foaming insole added with wormwood extract comprises the following steps:
s1: weighing 100 parts by weight of polyester polyol with the molecular weight of 3000 and 2 parts by weight of wormwood extract I under a vacuum condition, putting into a reaction kettle at normal temperature, and uniformly stirring to obtain a component A; wormwood extract I was prepared using the method of example 1;
s2: weighing 15 parts by weight of polyester polyol with the molecular weight of 5500, putting the polyester polyol into a reaction kettle at normal temperature, heating to 95 ℃, degassing and discharging rubber for 1h, then cooling to 55 ℃, putting 80 parts by weight of diisocyanate, heating to 75 ℃, and reacting for 1h to obtain a component B;
s3: respectively injecting the component A and the component B into a material tank, mixing at a machine head, injecting into an insole forming mold, closing the mold, carrying out hot press forming treatment for 200s at the temperature of 50 ℃, and carrying out mold opening, cooling and cutting to obtain a base layer of the polyurethane foaming insole added with the wormwood extract;
s4: carrying out hot-pressing compounding on the modified fabric treated by the wormwood extract II as a surface layer material and the base layer of the polyurethane foaming insole added with the wormwood extract obtained in S3 to obtain the polyurethane foaming insole added with the wormwood extract; the modified fabric treated with wormwood extract II was prepared using the method of example 5.
The polyurethane foamed shoe pad with the addition of the wormwood extract prepared in the example was tested, and the base layer density was 0.2g/cm3The slow release period of the wormwood extract in the base layer is 210 days, the bacteriostasis period of the surface layer is 180 days, and the bacteriostasis rates (staphylococcus aureus and escherichia coli) of the base layer and the surface layer are both more than 99.9%.
Example 9
A preparation method of a polyurethane foaming insole added with wormwood extract comprises the following steps:
s1: weighing 105 parts by weight of polyester polyol with the molecular weight of 3500 and 15 parts by weight of wormwood extract I under a vacuum condition, putting into a reaction kettle at normal temperature, and uniformly stirring to obtain a component A; wormwood extract I was prepared using the method of example 2;
s2: weighing 20 parts by weight of polyester polyol with the molecular weight of 7000, putting the polyester polyol into a reaction kettle at normal temperature, firstly heating to 100 ℃, degassing and discharging rubber for 1.5h, then cooling to 55 ℃, putting 80 parts by weight of diisocyanate, heating to 80 ℃, and reacting for 1.5h to obtain a component B;
s3: respectively injecting the component A and the component B into a material tank, mixing at a machine head, injecting into an insole forming mold, closing the mold, carrying out hot press forming treatment for 300s at 55 ℃, and carrying out mold opening, cooling and cutting to obtain a base layer of the polyurethane foaming insole added with the wormwood extract;
s4: carrying out hot-pressing compounding on the modified fabric treated by the wormwood extract II as a surface layer material and the base layer of the polyurethane foaming insole added with the wormwood extract obtained in S3 to obtain the polyurethane foaming insole added with the wormwood extract; the modified fabric treated with wormwood extract II was prepared using the method of example 6.
The polyurethane foamed shoe pad with the addition of the wormwood extract prepared in the example was tested, and the base layer density was 0.18g/cm3The slow release period of the wormwood extract in the base layer is 215 days, the bacteriostasis period of the surface layer is 185 days, and the bacteriostasis rates (staphylococcus aureus and escherichia coli) of the base layer and the surface layer are both more than 99.9%.
Example 10
A preparation method of a polyurethane foaming insole added with wormwood extract comprises the following steps:
s1: under the vacuum condition, 102 parts by weight of polyester polyol with the molecular weight of 3300 and 9 parts by weight of wormwood extract I are weighed, put into a reaction kettle at normal temperature, and are uniformly stirred to obtain a component A; wormwood extract I was prepared using the method of example 3;
s2: weighing 18 parts by weight of polyester polyol with the molecular weight of 6000, adding the polyester polyol into a reaction kettle at normal temperature, heating to 98 ℃, degassing, removing glue for 1.25h, then cooling to 55 ℃, adding 80 parts by weight of diisocyanate, heating to 78 ℃, and reacting for 1.25h to obtain a component B;
s3: respectively injecting the component A and the component B into a material tank, mixing at a machine head, injecting into an insole forming mold, closing the mold, carrying out hot press forming treatment at 52 ℃ for 240s, and carrying out mold opening, cooling and cutting to obtain a base layer of the polyurethane foaming insole added with the wormwood extract;
s4: carrying out hot-pressing compounding on the modified fabric treated by the wormwood extract II as a surface layer material and the base layer of the polyurethane foaming insole added with the wormwood extract obtained in S3 to obtain the polyurethane foaming insole added with the wormwood extract; the modified fabric treated with wormwood extract II was prepared using the method of example 5.
The polyurethane foamed shoe pad with the addition of the wormwood extract prepared in the example was tested, and the base layer density was 0.17g/cm3The slow release period of the wormwood extract in the base layer is 240 days, the bacteriostasis period of the surface layer is 220 days, and the bacteriostasis rates (staphylococcus aureus and escherichia coli) of the base layer and the surface layer are both more than 99.9%.
Examples of the experiments
The general insole performance of the polyurethane foamed insoles added with the wormwood extract prepared in examples 8 to 10 was tested, and the test results are shown in table 1.
TABLE 1 results of general insole Performance test of moxa extract-added polyurethane foamed insoles prepared in examples 8 to 10
| Test items | Absorbing and discharging moisture | Hardness (Shao A) | Breathability (L/min) |
| Example 8 | 220％ | 25 | 64 |
| Example 9 | 220％ | 26 | 67 |
| Example 10 | 220％ | 25 | 71 |
It is noted that, in the present application, relational terms such as first, second, third, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (8)
1. The polyurethane foaming insole added with the wormwood extract is characterized by being divided into a base layer and a surface layer; the base layer is a polyurethane foaming material added with a wormwood extract I; the face layer is an improved fabric treated with wormwood extract II.
2. The polyurethane foaming insole added with the wormwood extract as claimed in claim 1, wherein the preparation method of wormwood extract I comprises the following steps:
crushing the dried wormwood, carrying out water extraction or alcohol extraction treatment, and carrying out spray drying treatment on the obtained product to obtain a wormwood water extract or wormwood alcohol extract;
adding the wormwood water extract or the alcohol extract into the calcium salt solution, uniformly mixing, adding the sodium alginate aqueous solution, and drying to obtain a precursor;
and crushing and sieving the precursor to obtain the wormwood extract.
3. The polyurethane foam insole added with wormwood extract as claimed in claim 2, wherein the concentration of the calcium salt is: 0.01mol/L to 0.5 mol/L.
4. The polyurethane foaming insole added with the wormwood extract as claimed in claim 2, wherein the concentration of the sodium alginate aqueous solution is 0.05 mol/L-0.25 mol/L.
5. The polyurethane foam insole added with wormwood extract as claimed in claim 2, wherein the screening is 400 mesh.
6. The polyurethane foaming insole added with the wormwood extract as claimed in claim 1, wherein the preparation method of wormwood extract II comprises the following steps:
crushing the dried wormwood, and carrying out water extraction or alcohol extraction treatment to obtain wormwood water extract or wormwood alcohol extract;
and carrying out spray drying treatment on the obtained wormwood water extract or wormwood alcohol extract to obtain a wormwood extract II.
7. The polyurethane foaming insole added with the wormwood extract as claimed in claim 1, wherein the preparation method of the surface layer comprises the following steps:
adding the wormwood extract II into the viscose, and fully mixing to obtain a spinning stock solution;
the obtained spinning solution is sprayed out to be hollow spun through two concentric spinneret orifices;
soaking the obtained hollow spinning in an alcoholic solution of wormwood extract II with the concentration of 0.001-0.003 mol/L, and preserving the temperature at 40-50 ℃ for 30-60 min to obtain improved fiber;
weaving the obtained modified fiber to obtain the modified fabric treated by the wormwood extract II as a surface layer material.
8. The preparation method of the mugwort extract-added polyurethane foamed insole according to any one of claims 1 to 7, comprising the steps of:
s1: weighing 100-105 parts by weight of polyester polyol with the molecular weight of 3000-3500 and 2-15 parts by weight of wormwood extract I under a vacuum condition, putting into a reaction kettle at normal temperature, and uniformly stirring to obtain a component A;
s2: weighing 15-20 parts by weight of polyester polyol with the molecular weight of 5500-7000, putting the polyester polyol into a reaction kettle at normal temperature, heating to 95-100 ℃, degassing and removing glue for 1-1.5 h, then cooling to 55 ℃, putting 80 parts by weight of diisocyanate, heating to 75-80 ℃, and reacting for 1-1.5 h to obtain a component B;
s3: respectively injecting the component A and the component B into a material tank, mixing at a machine head, injecting into an insole forming mold, closing the mold, carrying out hot press forming treatment for 200-300 s at the temperature of 50-55 ℃, and carrying out mold opening, cooling and cutting to obtain a base layer of the polyurethane foaming insole added with the wormwood extract;
s4: and (3) carrying out hot-pressing compounding on the modified fabric treated by the wormwood extract II as a surface layer material and the base layer of the polyurethane foaming insole added with the wormwood extract obtained in the step S3 to obtain the polyurethane foaming insole added with the wormwood extract.
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| CN113211706A (en) * | 2021-03-14 | 2021-08-06 | 杭州锴越新材料有限公司 | Antibacterial sweat-absorbing health-care insole and preparation method thereof |
| CN115336838A (en) * | 2022-08-17 | 2022-11-15 | 足力健老龄产业发展有限公司北京分公司 | Antibacterial and odor-absorbing wormwood insole and preparation method and application thereof |
| CN117162524A (en) * | 2023-09-06 | 2023-12-05 | 东莞景丰塑胶制品有限公司 | Plastic shell manufacturing and forming process |
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