CN112029135A - Preparation method of wood fiber sponge - Google Patents
Preparation method of wood fiber sponge Download PDFInfo
- Publication number
- CN112029135A CN112029135A CN202010926585.5A CN202010926585A CN112029135A CN 112029135 A CN112029135 A CN 112029135A CN 202010926585 A CN202010926585 A CN 202010926585A CN 112029135 A CN112029135 A CN 112029135A
- Authority
- CN
- China
- Prior art keywords
- soaking
- solution
- wood fiber
- fiber sponge
- wood pulp
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/26—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a solid phase from a macromolecular composition or article, e.g. leaching out
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/28—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/36—After-treatment
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2397/00—Characterised by the use of lignin-containing materials
- C08J2397/02—Lignocellulosic material, e.g. wood, straw or bagasse
Abstract
The invention discloses a preparation method of wood fiber sponge, which comprises the following steps: s1: pretreatment one: cutting wood pulp into rectangular small pieces, and soaking the cut wood pulp into NaOH solution; s2: and (2) pretreatment II: after soaking for a period of time, soaking the wood pulp soaked in the NaOH solution at room temperature, and finally drying; s3: solution preparation: preparing a NaOH/thiourea mixed aqueous solution with the concentration of 6-9 wt%; s4: mixing and soaking: and (3) placing the wood pulp obtained after the first pretreatment and the second pretreatment into a NaOH/thiourea mixed aqueous solution with the concentration of 6-9 wt% for soaking, and S5: freezing and unfreezing: and (3) putting the cellulose solution obtained after the mixing and soaking treatment into a refrigerator for freezing, taking out the cellulose solution after freezing for a period of time, and unfreezing the cellulose solution by using a hot air drier. According to the preparation method of the wood fiber sponge, wood pulp is placed into NaOH solution to be soaked, so that impurities such as lignin and inorganic salt adhered to the surface of cellulose can be reduced.
Description
Technical Field
The invention relates to the technical field of sponge preparation, in particular to a preparation method of wood fiber sponge.
Background
Sponges, which are porous materials, have good water absorption and can be used to clean articles. Sponges commonly used by people are made of wood cellulose fibers or foamed plastic polymers. In addition, there are also natural sponges made of sponge animals, and most of the natural sponges are used for body cleaning or painting. In addition, there are three types of synthetic sponges made of other materials, low density polyether (non-absorbent sponge), polyvinyl alcohol (superabsorbent material, no significant air holes) and polyester, respectively. The existing wood fiber sponge has more and more extensive use, but the prior art still adheres a large amount of impurities such as lignin, inorganic salt and the like on the surface for preparing the wood fiber sponge.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a preparation method of a wood fiber sponge, which solves the problem that a large amount of impurities such as lignin, inorganic salt and the like are adhered to the surface of the wood fiber sponge prepared by the prior art.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a preparation method of a wood fiber sponge comprises the following steps:
s1: pretreatment one:
cutting wood pulp into rectangular small pieces, and soaking the cut wood pulp into NaOH solution;
s2: and (2) pretreatment II:
after soaking for a period of time, soaking the wood pulp soaked in the NaOH solution at room temperature, and finally drying;
s3: solution preparation:
preparing a NaOH/thiourea mixed aqueous solution with the concentration of 6-9 wt%;
s4: mixing and soaking:
putting wood pulp obtained after the first pretreatment and the second pretreatment into a NaOH/thiourea mixed aqueous solution with the concentration of 6-9 wt% for soaking;
s5: freezing and unfreezing:
after mixing and soaking treatment, putting the obtained cellulose solution into a refrigerator for freezing, and then taking out the cellulose solution and unfreezing the cellulose solution by using a hot air drier after freezing for a period of time;
s6 preparation of wood fiber sponge:
after the cellulose solution is unfrozen, adding a pore-forming agent with the dosage of 20-28 g, stirring, pouring the uniformly mixed liquid obtained after stirring into a mould for low-temperature forming, putting the formed liquid into a hot sulfuric acid coagulation bath for regeneration, after most of inorganic salt is dissolved out, putting the formed liquid into warm water for cleaning, and finally drying to obtain a wood fiber sponge product;
s7: dyeing treatment:
and dyeing the prepared wood fiber sponge product, and drying the wood fiber sponge product after dyeing.
Preferably, the wood pulp is cut into rectangular pieces in the S1 step, each of which has a length and a width of 3cm, and is put into NaOH solution at a concentration of 13 wt%
The soaking time in the step S4 is preferably 30min to 60min,
the freezing time in the preferred S5 step is 1h,
the stirring time in S6 is preferably 20 to 35min,
the preferable drying time in the step S7 is 10min to 20 min.
(III) advantageous effects
Compared with the prior art, the invention provides a preparation method of wood fiber sponge, which has the following beneficial effects:
according to the preparation method of the wood fiber sponge, wood pulp cut into rectangular small pieces is placed into NaOH solution to be soaked, so that a large amount of impurities such as lignin and inorganic salt adhered to the surface of cellulose can be greatly reduced, and the activity of the cellulose is also obviously improved; the advantages of the product properties can be improved by the dyeing treatment, and the aging resistance and the service life of the product can also be improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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.
The first embodiment is as follows: the preparation method of the wood fiber sponge is characterized by comprising the following steps:
s1: pretreatment one:
cutting wood pulp into rectangular small pieces, wherein the length and the width of the wood pulp are both 3cm, then putting the wood pulp cut into the rectangular small pieces into NaOH solution for soaking, the concentration of the NaOH solution is 13 wt%, and the wood pulp cut into the rectangular small pieces is put into the NaOH solution for soaking, so that a large amount of impurities such as lignin, inorganic salt and the like adhered to the surface of cellulose can be greatly reduced, and the activity of the cellulose is also obviously improved;
s2: and (2) pretreatment II:
after soaking for a period of time, soaking the wood pulp soaked in the NaOH solution at room temperature, and finally drying for 30min, wherein the soaking time is 2.5-3.5 h;
s3: solution preparation:
preparing a NaOH/thiourea mixed aqueous solution with the concentration of 6 wt%;
s4: mixing and soaking:
putting the wood pulp obtained after the first pretreatment and the second pretreatment into a mixed aqueous solution of NaOH/thiourea with the concentration of 6 wt% for soaking for 30-60 min;
s5: freezing and unfreezing:
after mixing and soaking treatment, putting the obtained cellulose solution into a refrigerator for freezing, and after freezing for a period of time, taking out the cellulose solution and unfreezing the cellulose solution by using a hot air drier, wherein the freezing time is 1 h;
s6 preparation of wood fiber sponge:
after the cellulose solution is unfrozen, adding a pore-forming agent with the dosage of 20g, stirring for 20-35 min, stirring to obtain uniformly mixed liquid, pouring the uniformly mixed liquid into a mould for low-temperature forming, placing the formed liquid into a hot sulfuric acid coagulation bath for regeneration, enhancing the strength of adhesive fibers through the sulfuric acid coagulation bath, after most of inorganic salt is dissolved out, placing the liquid into warm water for cleaning, and finally drying to obtain a wood fiber sponge product;
s7: dyeing treatment:
the prepared wood fiber sponge product is dyed and then dried, and the product performance can be improved through dyeing, and the aging resistance and the service life of the product can be improved.
Example two: the preparation method of the wood fiber sponge is characterized by comprising the following steps:
s1: pretreatment one:
cutting wood pulp into rectangular small pieces, wherein the length and the width of the wood pulp are both 3cm, then putting the wood pulp cut into the rectangular small pieces into NaOH solution for soaking, the concentration of the NaOH solution is 13 wt%, and the wood pulp cut into the rectangular small pieces is put into the NaOH solution for soaking, so that a large amount of impurities such as lignin, inorganic salt and the like adhered to the surface of cellulose can be greatly reduced, and the activity of the cellulose is also obviously improved;
s2: and (2) pretreatment II:
after soaking for a period of time, soaking the wood pulp soaked in the NaOH solution at room temperature, and finally drying for 30min, wherein the soaking time is 2.5-3.5 h;
s3: solution preparation:
preparing a NaOH/thiourea mixed aqueous solution with the concentration of 9 wt%;
s4: mixing and soaking:
putting the wood pulp obtained after the first pretreatment and the second pretreatment into a mixed aqueous solution of NaOH/thiourea with the concentration of 9 wt% for soaking for 30-60 min;
s5: freezing and unfreezing:
after mixing and soaking treatment, putting the obtained cellulose solution into a refrigerator for freezing, and after freezing for a period of time, taking out the cellulose solution and unfreezing the cellulose solution by using a hot air drier, wherein the freezing time is 1 h;
s6 preparation of wood fiber sponge:
after the cellulose solution is unfrozen, adding a pore-forming agent with the dosage of 28g, stirring for 20-35 min, stirring to obtain uniformly mixed liquid, pouring the uniformly mixed liquid into a mould for low-temperature forming, placing the formed liquid into a hot sulfuric acid coagulation bath for regeneration, enhancing the strength of adhesive fibers through the sulfuric acid coagulation bath, after most of inorganic salt is dissolved out, placing the liquid into warm water for cleaning, and finally drying to obtain a wood fiber sponge product;
s7: dyeing treatment:
the prepared wood fiber sponge product is dyed and then dried, and the product performance can be improved through dyeing, and the aging resistance and the service life of the product can be improved.
Example three: the preparation method of the wood fiber sponge is characterized by comprising the following steps:
s1: pretreatment one:
cutting wood pulp into rectangular small pieces, wherein the length and the width of the wood pulp are both 3cm, then putting the wood pulp cut into the rectangular small pieces into NaOH solution for soaking, the concentration of the NaOH solution is 13 wt%, and the wood pulp cut into the rectangular small pieces is put into the NaOH solution for soaking, so that a large amount of impurities such as lignin, inorganic salt and the like adhered to the surface of cellulose can be greatly reduced, and the activity of the cellulose is also obviously improved;
s2: and (2) pretreatment II:
after soaking for a period of time, soaking the wood pulp soaked in the NaOH solution at room temperature, and finally drying for 30min, wherein the soaking time is 2.5-3.5 h;
s3: solution preparation:
preparing a NaOH/thiourea mixed aqueous solution with the concentration of 7 wt%;
s4: mixing and soaking:
putting the wood pulp obtained after the first pretreatment and the second pretreatment into a mixed aqueous solution of NaOH/thiourea with the concentration of 7 wt% for soaking for 30-60 min;
s5: freezing and unfreezing:
after mixing and soaking treatment, putting the obtained cellulose solution into a refrigerator for freezing, and after freezing for a period of time, taking out the cellulose solution and unfreezing the cellulose solution by using a hot air drier, wherein the freezing time is 1 h;
s6 preparation of wood fiber sponge:
after the cellulose solution is unfrozen, adding a pore-forming agent with the dosage of 22g, stirring for 20-35 min, stirring to obtain uniformly mixed liquid, pouring the uniformly mixed liquid into a mould for low-temperature forming, placing the formed liquid into a hot sulfuric acid coagulation bath for regeneration, enhancing the strength of adhesive fibers through the sulfuric acid coagulation bath, after most of inorganic salt is dissolved out, placing the liquid into warm water for cleaning, and finally drying to obtain a wood fiber sponge product;
s7: dyeing treatment:
the prepared wood fiber sponge product is dyed and then dried, and the product performance can be improved through dyeing, and the aging resistance and the service life of the product can be improved.
Example four: the preparation method of the wood fiber sponge is characterized by comprising the following steps:
s1: pretreatment one:
cutting wood pulp into rectangular small pieces, wherein the length and the width of the wood pulp are both 3cm, then putting the wood pulp cut into the rectangular small pieces into NaOH solution for soaking, the concentration of the NaOH solution is 13 wt%, and the wood pulp cut into the rectangular small pieces is put into the NaOH solution for soaking, so that a large amount of impurities such as lignin, inorganic salt and the like adhered to the surface of cellulose can be greatly reduced, and the activity of the cellulose is also obviously improved;
s2: and (2) pretreatment II:
after soaking for a period of time, soaking the wood pulp soaked in the NaOH solution at room temperature, and finally drying for 30min, wherein the soaking time is 2.5-3.5 h;
s3: solution preparation:
preparing a NaOH/thiourea mixed aqueous solution with the concentration of 7.5 wt%;
s4: mixing and soaking:
putting the wood pulp obtained after the first pretreatment and the second pretreatment into a NaOH/thiourea mixed aqueous solution with the concentration of 7.5 wt% for soaking for 30-60 min;
s5: freezing and unfreezing:
after mixing and soaking treatment, putting the obtained cellulose solution into a refrigerator for freezing, and after freezing for a period of time, taking out the cellulose solution and unfreezing the cellulose solution by using a hot air drier, wherein the freezing time is 1 h;
s6 preparation of wood fiber sponge:
after the cellulose solution is unfrozen, adding a pore-forming agent with the dosage of 24g, stirring for 20-35 min, stirring to obtain uniformly mixed liquid, pouring the uniformly mixed liquid into a mould for low-temperature forming, placing the formed liquid into a hot sulfuric acid coagulation bath for regeneration, enhancing the strength of adhesive fibers through the sulfuric acid coagulation bath, after most of inorganic salt is dissolved out, placing the liquid into warm water for cleaning, and finally drying to obtain a wood fiber sponge product;
s7: dyeing treatment:
the prepared wood fiber sponge product is dyed and then dried, and the product performance can be improved through dyeing, and the aging resistance and the service life of the product can be improved.
Example five: the preparation method of the wood fiber sponge is characterized by comprising the following steps:
s1: pretreatment one:
cutting wood pulp into rectangular small pieces, wherein the length and the width of the wood pulp are both 3cm, then putting the wood pulp cut into the rectangular small pieces into NaOH solution for soaking, the concentration of the NaOH solution is 13 wt%, and the wood pulp cut into the rectangular small pieces is put into the NaOH solution for soaking, so that a large amount of impurities such as lignin, inorganic salt and the like adhered to the surface of cellulose can be greatly reduced, and the activity of the cellulose is also obviously improved;
s2: and (2) pretreatment II:
after soaking for a period of time, soaking the wood pulp soaked in the NaOH solution at room temperature, and finally drying for 30min, wherein the soaking time is 2.5-3.5 h;
s3: solution preparation:
preparing a NaOH/thiourea mixed aqueous solution with the concentration of 8 wt%;
s4: mixing and soaking:
putting the wood pulp obtained after the first pretreatment and the second pretreatment into a mixed aqueous solution of NaOH/thiourea with the concentration of 8 wt% for soaking for 30-60 min;
s5: freezing and unfreezing:
after mixing and soaking treatment, putting the obtained cellulose solution into a refrigerator for freezing, and after freezing for a period of time, taking out the cellulose solution and unfreezing the cellulose solution by using a hot air drier, wherein the freezing time is 1 h;
s6 preparation of wood fiber sponge:
after the cellulose solution is unfrozen, adding a pore-forming agent with the dosage of 26g, stirring for 20-35 min, stirring to obtain uniformly mixed liquid, pouring the uniformly mixed liquid into a mould for low-temperature forming, placing the formed liquid into a hot sulfuric acid coagulation bath for regeneration, enhancing the strength of adhesive fibers through the sulfuric acid coagulation bath, after most of inorganic salt is dissolved out, placing the liquid into warm water for cleaning, and finally drying to obtain a wood fiber sponge product;
s7: dyeing treatment:
the prepared wood fiber sponge product is dyed and then dried, and the product performance can be improved through dyeing, and the aging resistance and the service life of the product can be improved.
The invention has the beneficial effects that: the wood pulp cut into rectangular small pieces is put into NaOH solution to be soaked, so that a large amount of impurities such as lignin, inorganic salt and the like adhered to the surface of cellulose can be greatly reduced, and the activity of the cellulose is also obviously improved; the advantages of the product properties can be improved by the dyeing treatment, and the aging resistance and the service life of the product can also be improved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The preparation method of the wood fiber sponge is characterized by comprising the following steps:
s1: pretreatment one:
cutting wood pulp into rectangular small pieces, and soaking the cut wood pulp into NaOH solution;
s2: and (2) pretreatment II:
after soaking for a period of time, soaking the wood pulp soaked in the NaOH solution at room temperature, and finally drying;
s3: solution preparation:
preparing a NaOH/thiourea mixed aqueous solution with the concentration of 6-9 wt%;
s4: mixing and soaking:
putting wood pulp obtained after the first pretreatment and the second pretreatment into a NaOH/thiourea mixed aqueous solution with the concentration of 6-9 wt% for soaking;
s5: freezing and unfreezing:
after mixing and soaking treatment, putting the obtained cellulose solution into a refrigerator for freezing, and then taking out the cellulose solution and unfreezing the cellulose solution by using a hot air drier after freezing for a period of time;
s6 preparation of wood fiber sponge:
after the cellulose solution is unfrozen, adding a pore-forming agent with the dosage of 20-28 g, stirring, pouring the uniformly mixed liquid obtained after stirring into a mould for low-temperature forming, putting the formed liquid into a hot sulfuric acid coagulation bath for regeneration, after most of inorganic salt is dissolved out, putting the formed liquid into warm water for cleaning, and finally drying to obtain a wood fiber sponge product;
s7: dyeing treatment:
and dyeing the prepared wood fiber sponge product, and drying the wood fiber sponge product after dyeing.
2. The method of claim 1, wherein the wood pulp is cut into rectangular pieces each having a length and a width of 3cm in the step of S1, and the pieces are put into NaOH solution at a concentration of 13 wt%.
3. The method for preparing wood fiber sponge according to claim 1, wherein the soaking time in the step of S2 is 2.5-3.5 h, and the drying time is 30 min.
4. The method for preparing wood fiber sponge according to claim 1, wherein the soaking time in the step of S4 is 30-60 min.
5. The method of claim 1, wherein the freezing time in the step S5 is 1 hour.
6. The method for preparing wood fiber sponge according to claim 1, wherein the stirring time in S6 is 20-35 min.
7. The method for preparing wood fiber sponge according to claim 1, wherein the drying time in the step of S7 is 10-20 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010926585.5A CN112029135A (en) | 2020-09-07 | 2020-09-07 | Preparation method of wood fiber sponge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010926585.5A CN112029135A (en) | 2020-09-07 | 2020-09-07 | Preparation method of wood fiber sponge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112029135A true CN112029135A (en) | 2020-12-04 |
Family
ID=73583912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010926585.5A Pending CN112029135A (en) | 2020-09-07 | 2020-09-07 | Preparation method of wood fiber sponge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112029135A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114249924A (en) * | 2021-12-27 | 2022-03-29 | 江苏恒富新材料科技有限公司 | Acid and alkali resistant KHA modified wood pulp cotton material and preparation method and application thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110577663A (en) * | 2018-06-07 | 2019-12-17 | 淮安市冰青建设工程管理有限公司 | Preparation method of environment-friendly cellulose sponge material |
| CN110577666A (en) * | 2018-06-07 | 2019-12-17 | 淮安市冰青建设工程管理有限公司 | Environment-friendly cellulose sponge material |
-
2020
- 2020-09-07 CN CN202010926585.5A patent/CN112029135A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110577663A (en) * | 2018-06-07 | 2019-12-17 | 淮安市冰青建设工程管理有限公司 | Preparation method of environment-friendly cellulose sponge material |
| CN110577666A (en) * | 2018-06-07 | 2019-12-17 | 淮安市冰青建设工程管理有限公司 | Environment-friendly cellulose sponge material |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114249924A (en) * | 2021-12-27 | 2022-03-29 | 江苏恒富新材料科技有限公司 | Acid and alkali resistant KHA modified wood pulp cotton material and preparation method and application thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106279749A (en) | A kind of alginate and the preparation method of fibroin albumen composite sponge | |
| CN101927516B (en) | Overall-bamboo anti-cracking processing method | |
| CN107233613A (en) | A kind of aquatic origin cross-linked collagen composite multi-layer medical dressing | |
| CN104189944B (en) | High-purity natural collagenous fiber and preparation method thereof | |
| CN105561379B (en) | A kind of preparation method of novel oxidized cellulose hemostasia products | |
| CN112029135A (en) | Preparation method of wood fiber sponge | |
| CN107700226B (en) | Aerogel non-woven fabric suitable for inner layer of paper diaper and preparation method | |
| CN104491920A (en) | Method for preparing absorbable suture | |
| CN109049222A (en) | A method of improving rattan processing performance | |
| CN104874012B (en) | Fluff type collagen hemostatic material and preparation method thereof | |
| CN112402112A (en) | Sanitary towel with super-strong blood absorption and blood locking capabilities and preparation process thereof | |
| CN110549696B (en) | Hyaluronic acid-based skin-friendly cloth and preparation method thereof | |
| CN105944135A (en) | Composite sponge and preparation method thereof | |
| CN113663465A (en) | Wet tissue capable of removing formaldehyde and purifying air | |
| CN110577663A (en) | Preparation method of environment-friendly cellulose sponge material | |
| CN109260502A (en) | A kind of fibroin hyaluronic acid mandruka and its preparation method and application | |
| CN104987740A (en) | Manufacturing method of a moisture preserving sponge | |
| CN102729303B (en) | Steam heat treatment type drying method for whole bamboos | |
| CN110577666A (en) | Environment-friendly cellulose sponge material | |
| CN102389584A (en) | Konjac sponge medical dressing and preparation method thereof | |
| CN108187121A (en) | A kind of postoperation hemostatic prevents being adhered the preparation method of medical dressing | |
| CN114652885A (en) | Double-layer-structure medical sponge dressing for preventing adhesion of new granulation and preparation method thereof | |
| CN204708778U (en) | A kind of compressed sponge goods | |
| CN104947240A (en) | Feather composite fiber textile material having health care function | |
| CN108515596B (en) | A kind of preparation method of insect prevention timber |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201204 |