CN116253913B - Preparation method of hydrophobic polylactic acid film - Google Patents
Preparation method of hydrophobic polylactic acid film Download PDFInfo
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- CN116253913B CN116253913B CN202310273767.0A CN202310273767A CN116253913B CN 116253913 B CN116253913 B CN 116253913B CN 202310273767 A CN202310273767 A CN 202310273767A CN 116253913 B CN116253913 B CN 116253913B
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- 230000002209 hydrophobic effect Effects 0.000 title claims abstract description 22
- 229920006381 polylactic acid film Polymers 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000002904 solvent Substances 0.000 claims abstract description 74
- 238000000034 method Methods 0.000 claims abstract description 37
- 239000004626 polylactic acid Substances 0.000 claims abstract description 34
- 229920000747 poly(lactic acid) Polymers 0.000 claims abstract description 33
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical group OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 45
- 239000011248 coating agent Substances 0.000 claims description 23
- 238000000576 coating method Methods 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 12
- 239000000758 substrate Substances 0.000 claims description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 8
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 8
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 claims description 8
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical group ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims description 4
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 238000010345 tape casting Methods 0.000 claims description 3
- 239000008199 coating composition Substances 0.000 claims description 2
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 2
- 238000001548 drop coating Methods 0.000 claims 1
- 238000005191 phase separation Methods 0.000 abstract description 18
- 239000002861 polymer material Substances 0.000 abstract description 5
- 230000029058 respiratory gaseous exchange Effects 0.000 abstract description 5
- 239000012528 membrane Substances 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 14
- 239000011148 porous material Substances 0.000 description 9
- 238000001878 scanning electron micrograph Methods 0.000 description 8
- 238000002425 crystallisation Methods 0.000 description 7
- 230000008025 crystallization Effects 0.000 description 7
- 229920000642 polymer Polymers 0.000 description 6
- 239000002086 nanomaterial Substances 0.000 description 5
- 230000003075 superhydrophobic effect Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000004090 dissolution Methods 0.000 description 3
- 230000001788 irregular Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 238000000935 solvent evaporation Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 241000238631 Hexapoda Species 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000004113 cell culture Methods 0.000 description 1
- 238000005234 chemical deposition Methods 0.000 description 1
- 238000007385 chemical modification Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000010041 electrostatic spinning Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000005661 hydrophobic surface Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002114 nanocomposite Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
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
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/02—Chemical treatment or coating of shaped articles made of macromolecular substances with solvents, e.g. swelling agents
-
- 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
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- 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
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
Abstract
The invention belongs to the field of high polymer materials, and particularly relates to a preparation method of a hydrophobic polylactic acid film. The invention provides a method for preparing a polylactic acid hydrophobic membrane by utilizing a non-solvent induced phase separation combined respiration pattern method, which has controllable membrane surface microstructure, simple process and simple and convenient operation and is suitable for expanded production and industrial application.
Description
Technical Field
The invention belongs to the field of high polymer materials, and particularly relates to a preparation method of a hydrophobic polylactic acid film.
Background
Polylactic acid (PLA) is an environment-friendly polymer material, has the advantages of being renewable, biodegradable, nontoxic, good in mechanical property and the like, and has application in the fields of packaging, biological medicine, agriculture and the like. The hydrophobic modification of PLA can widen the application of the PLA in the fields of water resistance, adhesion resistance, self cleaning and the like.
Lotus leaves, insect wings and the like in nature realize a self-cleaning function by forming a hydrophobic surface. With the sense of inspiration, the hydrophobic performance of the polymer material can be improved by constructing a micro/nano composite structure on the surface of the polymer material, and the preparation of the hydrophobic or super-hydrophobic material is realized. At present, the construction of the micro-nano surface structure is mainly realized by utilizing low surface energy materials (fluorinated organic matters, organic silicon and the like) and combining a sol-gel method, a template method, a printing method, an electrostatic spinning method, a chemical deposition method, a plasma treatment method and the like. These methods have the problems of complicated process, high cost and the like. In contrast, the method for controlling the surface crystallization of polylactic acid in the phase inversion process by utilizing the phase separation method, and regulating and controlling the microstructure, chemical composition and hydrophobicity of the surface of the film has the advantages of simple operation, good repeatability and the like. The existing phase separation method is mainly used for constructing a surface microstructure by a solution casting method, and has the problems of poor controllability of the surface structure of the film and inapplicability to expansion and industrialization application. Based on non-solvent induced phase separation, the solubility parameter of the non-solvent is changed by controlling the volatilization rate of the solvent and introducing a respiration pattern method, so that the controllable construction of the micro-morphology of the polylactic acid film surface can be realized.
Patent number: CN 107090087A; title: the method for preparing the PLA superhydrophobic film with controllable adhesion by using a solvent-non-solvent auxiliary microphase separation method; the content is as follows: the specific preparation process utilizes non-solvent to induce phase separation, the polylactic acid is dissolved in good solvent and mixed with different types and proportions of non-good solvents, and the micro-nano structure film is obtained after volatilization and stripping, and has super-hydrophobic and adhesive properties; disadvantages: the obtained micro-nano structure is not easy to regulate and control, is not a simple surface microstructure, has a microstructure in the film, and has the advantages of more harmful organic matters generated by solvent volatilization, long preparation time, higher requirements on temperature control, severe preparation conditions and complex process.
Patent number: CN 105085953A; title: a method for preparing a polylactic acid super-hydrophobic film by using a phase separation method; the content is as follows: the specific preparation process utilizes non-solvent to induce phase separation, and the polylactic acid is dissolved in good solvent and mixed with different types and proportions of non-good solvents, and the micro-nano structure film is obtained after volatilization; disadvantages: the obtained micro-nano structure is not easy to regulate and control, irregular in shape, complex and various in structure, not a simple surface microstructure, microstructures exist in the film, more harmful organic matters are generated by volatilization of the solvent, the preparation time is long, the requirement on temperature control is high, the preparation condition is severe, and the process is complex.
Disclosure of Invention
The invention aims to provide a preparation method of a hydrophobic polylactic acid film, which aims to solve the problems in the prior art.
Based on the above purposes, the invention adopts the following technical scheme:
the preparation method of the hydrophobic polylactic acid film comprises the following steps:
1) Preparing a polylactic acid film: adding polylactic acid into a good solvent to obtain a polylactic acid solution, and obtaining a polylactic acid substrate through tape casting coating;
2) Mixing a good solvent and a non-good solvent to prepare a coating liquid;
3) Coating the coating liquid on a polylactic acid substrate, volatilizing in an environment with certain ambient humidity and gas flow rate, and drying to obtain the hydrophobic polylactic acid film.
Further, the good solvent is chloroform, tetrahydrofuran, ethyl acetate; the mixed non-good solvent is methanol, absolute ethanol, n-butanol, isopropanol; the volume concentration of the mixed non-good solvent is 5-25%v/v; the ambient humidity is 30-70% RH.
Further, the concentration of the polylactic acid solution is 30mg/ml.
Further, the polylactic acid substrate film adopts a tape casting method.
Further, when the pre-coating system is prepared by mixing the non-good solvent and the good solvent in the step 2), the addition volume concentration of the non-good solvent is 5 to 20v/v%.
Further, the coating liquid is coated by a dripping method, and the coating is controlled to be 0.03-0.05 ml/cm in unit area 2 Is used as a coating amount of the coating composition.
Further, the solvent of the precoating film is volatilized, and the solvent volatilization conditions are as follows: in the sealed space, the ambient humidity is 30-70% RH, the air flow rate is 2-10L/min, and the volatilization is 10 min.
Further, the prepared film is dried, and the drying process is as follows: drying at 30deg.C in a forced air oven for 5min to remove water from the film.
The invention has the beneficial effects that:
the invention discloses a method for preparing a polylactic acid hydrophobic membrane by utilizing a non-solvent induced phase separation combined respiration pattern method, which has controllable membrane surface microstructure, simple process and simple and convenient operation and is suitable for expanded production and industrial application.
(1) Biodegradable polylactic acid is adopted as a material, low surface energy chemical modification is not needed, and the hydrophobic performance is realized only by constructing a surface microstructure;
(2) The structure of the surface micropore structure is realized by using a non-solvent assisted respiration method, and the control of the hydrophobicity is realized by simply adjusting the micropore size structure and the order degree of the non-solvent proportion;
(3) The polylactic acid super-hydrophobic film prepared by the design has the advantages of environmental friendliness, simplicity in operation, low cost, controllable structure, good repeatability, capability of being prepared on a large scale, controllable cost and the like;
(4) The polylactic acid has good biocompatibility and degradability, and the design has potential application value in the fields of fresh-keeping packaging, cell culture, tissue engineering and the like, realizes the value-added synergy of the polylactic acid, and promotes the industrial and commercial application of the polylactic acid material in various fields.
Drawings
FIG. 1 is a scanning electron micrograph of the surface of example 1;
FIG. 2 is a scanning electron micrograph of the surface of example 2;
FIG. 3 is a scanning electron micrograph of the surface of example 3;
FIG. 4 is a scanning electron micrograph of the surface of example 4;
FIG. 5 is a scanning electron micrograph of the surface of example 5;
FIG. 6 is a scanning electron micrograph of the surface of example 6;
FIG. 7 is a scanning electron micrograph of the surface of example 7;
fig. 8 is a scanning electron micrograph of the surface of example 8.
Detailed Description
The present invention will be described in detail with reference to specific examples.
Examples 1 to 4
The polylactic acid film with controllable hydrophobic property is prepared by using a non-solvent induced phase separation assisted respiration method, and the types and the addition amounts of various substances in the preparation process are shown in a table 1, and the specific steps are as follows:
(1) Dissolving 1.2g of polylactic acid into 40m l dichloromethane good solvent, and magnetically stirring to obtain PLA solution with uniform dissolution and 30mg/ml concentration; dissolving the obtained polymer, casting 10ml on a culture dish with a radius of 6cm, volatilizing the solvent at normal temperature, and finally obtaining the polylactic acid film substrate with a thickness of 0.4 mm; then adding 10v/v% of different types of non-good solvents, in examples 1-4, methylene dichloride, and mixing the non-good solvents such as methanol, ethanol, n-butanol and isopropanol to obtain a coating solutionThe method comprises the steps of carrying out a first treatment on the surface of the Dripping the coating solution onto polylactic acid film substrate, and coating 0.03ml/cm per unit area 2 Is used as a coating amount of (a); volatilizing 10min under the environment conditions of a sealed space, an environment humidity of 60% RH and an air flow rate of 2L/min to obtain a hydrophobic polylactic acid film with a micropore surface structure; the prepared film was dried in a forced air oven at 30℃for 5min to remove the film moisture. The contact angles of the prepared samples are shown in Table 1.
(2) Dissolving 1.2g of polylactic acid into 40m l dichloromethane good solvent, and magnetically stirring to obtain PLA solution with uniform dissolution and 30mg/ml concentration; dissolving the obtained polymer, casting 10ml on a culture dish with a radius of 6cm, volatilizing the solvent at normal temperature, and finally obtaining the polylactic acid film substrate with a thickness of 0.4 mm; in examples 5 to 8, the non-good solvent was methylene chloride, the mixed non-good solvent was methanol, and the non-good solvents were added at a concentration of 5 to 20v/v%, respectively, and the solvents were uniformly mixed to obtain a coating solution; dripping the coating solution onto polylactic acid film substrate, and coating 0.03ml/cm per unit area 2 Is used as a coating amount of (a); volatilizing 10min under the environment conditions of a sealed space, an environment humidity of 60% RH and an air flow rate of 2L/min to obtain a hydrophobic polylactic acid film with a micropore surface structure; the prepared film was dried in a forced air oven at 30℃for 5min to remove the film moisture. The contact angles of the prepared samples are shown in Table 2.
TABLE 1 kinds, contents and contact angles of various substances in examples 1 to 4
TABLE 2 kinds, contents and contact angles of various substances in examples 5 to 8
1. Sample analysis
The mutual dissolution of the good solvent and the non-solvent induces phase separation, the phase separation of the good solvent and the non-good solvent in the system is easy to form a bicontinuous structure, the good solvent dissolved in the good solvent is subjected to solid-liquid separation at the same time, and PLA crystallization is induced to form a micro-nano structure along with the dispersion and volatilization of the good solvent and the non-good solvent.
As can be seen from Table 1, the contact angle of the hydrophobic film prepared with the methanol non-good solvent in example 2 was the largest (129.5 °). It is shown that different non-good solvents induce polymer crystallization rates, affecting phase separation.
As can be seen from fig. 1, the surface of the film of example 1 is micro-structured micro-pores. The appearance is as follows: oval micropores with larger diameters and irregular arrangement; the depth of the micropores is shallow, a convex micron structure which is closely arranged is not formed, and water drops infiltrate on the surface; the surface contact angle was 79.4 ° as measured by a contact angle meter, and the hydrophobicity was poor.
As can be seen from fig. 2, the surface of the film of example 2 is micro-structured micro-pores. The appearance is as follows: circular micropores with diameters of 6-9 microns are regularly and orderly arranged, and compared with the structure of the micron in FIG. 1, the size structure is smaller; the pore walls of the micrometer size are closely and regularly arranged, the protrusions support the water drops on the surface, and the surface tension of the water drops is generated by air trapped in the micropores; the contact angle was 129.5 °, and the hydrophobicity was better.
As can be seen from fig. 3, the surface of the film of example 3 is micro-structured micro-pores. The appearance is as follows: circular micropores with diameters of 2-5 microns are regularly arranged, and compared with the structure of the micron in FIG. 2, the size structure is smaller; the hole wall with the micrometer size is not obvious in protrusion, the micropore depth is shallow, and the air cannot be trapped to generate larger surface tension on the liquid drop, so that the liquid drop has certain wettability; the contact angle is 104.4 degrees, and has certain hydrophobicity.
As can be seen from fig. 4, the surface of the film of example 4 is micro-structured micro-pores. The appearance is as follows: the diameter of the near-circular micropores is 1-6 microns, and the size structure is smaller; the pore walls with the micrometer size are not closely arranged, and cannot provide support for water drops; the contact angle is 117.6 degrees, and has certain hydrophobicity.
From the above analysis, it was found that PLA molecular chains rapidly separate and crystallize to form a microstructure as solvent evaporation and air water condensation non-solvent solubility change. As can be seen from FIGS. 1 to 4, the surface morphology of examples 1 to 4 exhibited different microporous structures using the hydrophobic polylactic acid film prepared according to the present invention. Ethanol is uniformly dissolved in dichloromethane and quickly volatilized, and the ethanol is quickly dissolved in solidified water molecules, so that the surface tension of liquid drops is reduced, a stable and uniform phase separation system cannot be formed, irregular micropores are formed, and the hydrophobicity is poor. When the non-solvent is replaced by n-butanol or isopropanol, the volatilization rate is low, and the non-solvent can be condensed with water molecules to form liquid drops with larger pore diameters, so that large-pore micropores are formed, and the sample shows certain hydrophobic property. When methanol is used as a non-solvent, the water and methanol complex is a typical Hydrogen Bond (HB) system, the pentamer form of water is the most stable, and the methanol molecule can be close to a five-membered water ring and forms a very stable structure with free hydroxyl groups on the ring, thereby being beneficial to phase separation. And the molecular polarity of the methanol molecules is better, so that the methanol has stronger hydrophilicity, and can better combine with stably condensed water molecules, so that the solubility of a non-good solvent is changed, the conversion of the linear state of polymer crystallization to a crystal nucleus state is further promoted, the growth of a molecular chain taking the crystal nucleus as a template is controlled, and the controllable microscopic morphology is realized. As discussed in detail below in terms of its surface microstructure.
As is clear from Table 2, the contact angle of the hydrophobic film prepared in example 6 using methanol at a concentration of 10v/v% as a non-good solvent was the largest (129.5 °). The indicated amount of non-good solvent induces the polymer crystallization rate, affecting the phase separation.
The surface tension of air moisture droplets absorbed by methanol increases during solvent evaporation, aggregates on the surface, and induces phase separation crystallization of the polymer by changing the solubility of the non-good solvent, resulting in a microporous structure. The methanol content influences the size of liquid drops, controls the surface tension, and finally influences the shape and size of micropores and the porosity. At low concentration, the proportion of good solvent in the solvent replacement process gradually decreases along with volatilization, but the volatilization process is a long-term process, methanol also has certain volatility as a non-solvent, so that partial phase separation phenomenon is caused by lower methanol content, in addition, the proportion of the non-solvent is increased, so that the quantity of good solvent in the good solvent/non-solvent phase is reduced, thereby the PLA separation precipitation and nucleation crystallization are induced, the phase separation time is effectively delayed along with the increase of the non-solvent content, the enough movement capability of molecular chains is ensured, and large-size grains are formed along the regular arrangement of crystal nucleus, so that narrow pore walls and regular micropores are obtained. With further increases in the non-solvent content, the contact angle value starts to decrease, which results can be attributed to an increase in droplet size and a lack of microstructural regularity in the separation system.
Claims (6)
1. The preparation method of the hydrophobic polylactic acid film is characterized by comprising the following steps of:
1) Preparing a polylactic acid film: adding polylactic acid into a good solvent to obtain a polylactic acid solution, and obtaining a polylactic acid substrate through tape casting coating;
2) Mixing a good solvent and a non-good solvent to prepare a coating liquid; the good solvent is chloroform, tetrahydrofuran and ethyl acetate; the non-good solvent is methanol, absolute ethanol, n-butanol, isopropanol; the volume concentration of the mixed non-good solvent is 5-25%v/v;
3) Coating the coating liquid on a polylactic acid substrate, volatilizing for 10min in a sealed space with the ambient humidity of 30-70% RH and the air flow rate of 2-10L/min, and drying to obtain the hydrophobic polylactic acid film.
2. The method of claim 1, wherein the polylactic acid solution has a concentration of 30mg/ml.
3. The method of claim 1, wherein the polylactic acid base film is formed by casting.
4. The method according to claim 1, wherein the non-good solvent and the good solvent are mixed in the pre-coating system in the preparation step 2), and the non-good solvent is added at a volume concentration of 5 to 20v/v%.
5. According to claimThe method according to claim 1, wherein the coating liquid is applied by a drop coating method, and the unit area is controlled to be coated with 0.03 to 0.05ml/cm 2 Is used as a coating amount of the coating composition.
6. The method of claim 1, wherein the prepared film is dried by: drying at 30deg.C in a forced air oven for 5min to remove water.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100082665A (en) * | 2009-01-09 | 2010-07-19 | 충남대학교산학협력단 | A process for controlling morphology and improving hydrophobicity of polymer substrate surface by using mixtures of good solvent and poor solvent |
| CN105085953A (en) * | 2015-08-25 | 2015-11-25 | 郑州大学 | Method for preparing polylactic acid super-hydrophobic membranes by aid of phase separation process |
| CN107090087A (en) * | 2017-05-12 | 2017-08-25 | 郑州大学 | The method that microphase-separated method prepares the controllable PLA based superhydrophobic thin films of adhesion is aided in using solventnonsolvent |
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| JP5537857B2 (en) * | 2009-07-30 | 2014-07-02 | 富士フイルム株式会社 | Method for producing porous film |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20100082665A (en) * | 2009-01-09 | 2010-07-19 | 충남대학교산학협력단 | A process for controlling morphology and improving hydrophobicity of polymer substrate surface by using mixtures of good solvent and poor solvent |
| CN105085953A (en) * | 2015-08-25 | 2015-11-25 | 郑州大学 | Method for preparing polylactic acid super-hydrophobic membranes by aid of phase separation process |
| CN107090087A (en) * | 2017-05-12 | 2017-08-25 | 郑州大学 | The method that microphase-separated method prepares the controllable PLA based superhydrophobic thin films of adhesion is aided in using solventnonsolvent |
Non-Patent Citations (1)
| Title |
|---|
| Ana Rita C. Duarte Devid Maniglio,et al..From honeycomb- to microsphere-patterned surfaces of poly(lactic acid) and a starch-poly(lactic acid) blend via the breath figure method.《J Appl Biomater Funct Mater》.2016,第31-42页. * |
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