CN116535546B - Preparation method of polyvinyl alcohol film and product thereof - Google Patents

Preparation method of polyvinyl alcohol film and product thereof Download PDF

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Publication number
CN116535546B
CN116535546B CN202310573047.6A CN202310573047A CN116535546B CN 116535546 B CN116535546 B CN 116535546B CN 202310573047 A CN202310573047 A CN 202310573047A CN 116535546 B CN116535546 B CN 116535546B
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polyvinyl alcohol
film
hydroxycinnamic acid
preparation
chloride
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CN116535546A (en
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高成涛
张黎
罗珊珊
李娟�
秦舒浩
李剑
武晓
雷庭
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Guizhou Material Industrial Technology Research Institute
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F8/00—Chemical modification by after-treatment
    • C08F8/14—Esterification
    • 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
    • C08J2329/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
    • C08J2329/02—Homopolymers or copolymers of unsaturated alcohols
    • C08J2329/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
    • 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

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)

Abstract

The invention discloses a preparation method of a polyvinyl alcohol film and a product thereof, comprising the steps of mixing a hydroxycinnamic acid compound and N, N-carbonyl diimidazole, adding a solvent, uniformly stirring, heating to 50-65 ℃ and reacting for 12-16 h to prepare a mixed solution; adding polyvinyl alcohol into the mixed solution, stirring and reacting for 4-6 hours at 90-95 ℃, cooling to 30-40 ℃, adding acyl chloride into the reaction system, continuing to react for 2-4 hours, standing and scraping the film to obtain the polyvinyl alcohol film. The invention selects the safe and environment-friendly hydroxycinnamic acid as an antibacterial substance and long-chain acyl as a hydrophobic substance, and grafts the antibacterial substance and the long-chain acyl as the hydrophobic substance to modify the polyvinyl alcohol by a chemical method, so that the esterification reaction and the introduced long-chain and phenyl groups are both favorable for improving the hydrophobicity of the film, and meanwhile, the film is endowed with certain antibacterial property, so that the method is simple, and the overall performance of the polyvinyl alcohol film is obviously improved.

Description

Preparation method of polyvinyl alcohol film and product thereof
Technical Field
The invention belongs to the field of preparation of polyvinyl alcohol films, and particularly relates to a preparation method of a polyvinyl alcohol film and a product thereof.
Background
Polyvinyl alcohol (PVA) is a macromolecular organic compound formed by saponifying polyvinyl acetate, can form hydrogen bonds with water, can be dissolved in water, can be used for preparing films, and meanwhile, the physical properties of the polyvinyl alcohol are influenced by chemical structures, alcoholysis degree and polymerization degree.
The polyvinyl alcohol film emits white light after ultraviolet irradiation, can be dissolved after being immersed in water, can permeate water vapor, but is difficult to permeate alcohol vapor and organic solvent gas, and has barrier property even better than that of a vinylidene chloride film.
The excellent water-solubility of polyvinyl alcohol shows remarkable advantages in the fields of medical packaging and textile, but has limited application due to poor water resistance and single function (such as no specific antibacterial property) in the fields of food and agricultural packaging and the like.
Therefore, there is a need in the art for a method of preparing polyvinyl alcohol films suitable for use in the fields of food and agricultural packaging.
Disclosure of Invention
This section is intended to outline some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description summary and in the title of the application, to avoid obscuring the purpose of this section, the description summary and the title of the invention, which should not be used to limit the scope of the invention.
The present invention has been made in view of the above and/or problems occurring in the prior art.
Therefore, the invention aims to overcome the defects in the prior art and provide a preparation method of a polyvinyl alcohol film.
In order to solve the technical problems, the invention provides the following technical scheme: a method for preparing a polyvinyl alcohol film comprises,
mixing a hydroxycinnamic acid compound with N, N-carbonyl diimidazole, adding a solvent, uniformly stirring, heating to 50-65 ℃ and reacting for 12-16 h to prepare a mixed solution;
adding polyvinyl alcohol into the mixed solution, stirring and reacting for 4-6 hours at 90-95 ℃, cooling to 30-40 ℃, adding acyl chloride into the reaction system, continuing to react for 2-4 hours, standing and scraping the film to obtain the polyvinyl alcohol film.
As a preferred embodiment of the preparation process according to the invention, there is provided: the molar ratio of the hydroxycinnamic acid compound to the N, N-carbonyl diimidazole is 1:1.
As a preferred embodiment of the preparation process according to the invention, there is provided: the solvent comprises dimethyl sulfoxide.
As a preferred embodiment of the preparation process according to the invention, there is provided: the volume mass ratio of the solvent to the hydroxycinnamic acid compound is as follows in mL: g is 40:2-4.
As a preferred embodiment of the preparation process according to the invention, there is provided: the mass ratio of the polyvinyl alcohol to the hydroxycinnamic acid compound is 1:1-2.
As a preferred embodiment of the preparation process according to the invention, there is provided: the acyl chloride is one or more of octanoyl chloride, lauroyl chloride and palmitoyl chloride.
As a preferred embodiment of the preparation process according to the invention, there is provided: the acyl chloride accounts for 5-8% of the mass of the reaction system.
As a preferred embodiment of the preparation process according to the invention, there is provided: the hydroxycinnamic acid compound is one or more of p-hydroxycinnamic acid, ferulic acid, caffeic acid and sinapic acid.
As a preferred embodiment of the preparation process according to the invention, there is provided: and (3) standing, wherein the standing time is 12-24 h.
It is still another object of the present invention to provide a polyvinyl alcohol film which overcomes the disadvantages of the prior art and is produced by the process for producing a polyvinyl alcohol film.
The invention has the beneficial effects that:
the typical hydrophilic characteristic of PVA is the advantage of being used as a water-soluble packaging material, but is too hydrophilic in most fields and becomes a use limit, and another great disadvantage of PVA materials is the lack of antibacterial property, so that the preservation of the materials per se and the use requirements of specific fields cannot be met; thus, improving the overall performance of PVA requires improving its water resistance and antimicrobial properties; the invention selects the safe and environment-friendly hydroxycinnamic acid as an antibacterial substance and long-chain acyl as a hydrophobic substance, and grafts the antibacterial substance and the long-chain acyl as the hydrophobic substance to modify the polyvinyl alcohol by a chemical method, so that the esterification reaction and the introduced long-chain and phenyl groups are both favorable for improving the hydrophobicity of the film, and meanwhile, the film is endowed with certain antibacterial property, so that the method is simple, and the overall performance of the polyvinyl alcohol film is obviously improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
FIG. 1 is a schematic diagram of the reaction mechanism in the examples of the present invention.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
One or more of the PVA types 2488, 2099, 1799, 1788, 224, 217 and 117 are common commercial products;
the hydroxy cinnamic acid is one or more of p-hydroxy cinnamic acid, ferulic acid, caffeic acid and sinapic acid, and is a common commercial product;
the long-chain hydrophobic substance in the invention is octanoyl chloride (C) 8 H 15 ClO), lauroyl chloride (C) 12 H 23 ClO), palmitoyl chloride (C) 16 H 31 ClO) is one or more of the common commercial products.
The invention discloses a performance testing method, which comprises the following steps:
(1) Mechanical properties: testing conditions of the 3 rd part of thin plastic and the thin sheet by adopting the national standard GB/T1040.3-2006 plastic tensile property are adopted to measure the tensile strength and the elongation at break of the thin film;
(2) Water resistance: measuring the contact angle of the film by adopting a contact angle measuring instrument;
(3) Antibacterial properties: the concentration is 10 -5 cfu/mL of escherichia coli bacterial suspension is used as an antibacterial test, 1mL of bacterial suspension is counted by a plate counting method before a sample is added, 1mL of bacterial suspension is added into 1mg/mL of polyvinyl alcohol physiological saline, 1mL of mixed solution is uniformly smeared on an agar culture medium by using a sterile glass rod at different times, and after inversion culture is performed for 24 hours in a constant-temperature incubator at 37 ℃, the plate colony number is recorded.
Antibacterial ratio (%) of the film against escherichia coli= (average colony count before addition of sample-average colony count after addition of sample)/average colony count before addition of sample×100%.
Example 1:
taking 4g of p-hydroxy cinnamic acid and N, N-carbonyl diimidazole with equal molar ratio, adding 40mL of dimethyl sulfoxide, stirring uniformly, and heating to 65 ℃ for reaction for 12h;
then adding 4g of polyvinyl alcohol (the mixing volume ratio is 1799:217=1:1), magnetically stirring for 4 hours at 95 ℃, cooling to 40 ℃, slowly dripping octanoyl chloride with the mass percent of 5% into a reaction system, continuously reacting for 2 hours, standing for 12 hours, scraping the film, and obtaining the polyvinyl alcohol film, wherein the thickness of the film is 0.08mm.
The mechanism of the reaction is shown in FIG. 1.
Comparative example 1:
pure PVA: 4g of PVA (mixing volume ratio is 1799:217=1:1) is taken, 40mL of dimethyl sulfoxide is added, the temperature is raised to 95 ℃, stirring and dissolution are carried out for 2h, standing and defoaming are carried out for 12h, and then film scraping is carried out, wherein the thickness of the prepared film is 0.08mm.
Comparative example 2:
pva+hydroxycinnamic acid:
taking 4g of p-hydroxy cinnamic acid and N, N-carbonyl diimidazole with equal molar ratio, adding 40mL of dimethyl sulfoxide, stirring uniformly, and heating to 65 ℃ for reaction for 12h;
then adding 4g of polyvinyl alcohol (the mixing volume ratio is 1799:217=1:1), heating to 95 ℃ and magnetically stirring for 4 hours, standing and defoaming for 12 hours, and scraping the film, wherein the thickness of the prepared film is 0.08mm.
Comparative example 3:
pva+long chain acyl:
adding 40mL of dimethyl sulfoxide into 4g of polyvinyl alcohol (the mixing volume ratio is 1799:217=1:1), heating to 95 ℃, stirring and dissolving for 2 hours, and cooling to 40 ℃;
slowly dripping octanoyl chloride with the mass fraction of 5% into the reaction system, continuously reacting for 2 hours, standing for 12 hours, and scraping the film, wherein the thickness of the prepared film is 0.08mm. Carrying out
The experimental results are shown in Table 1.
TABLE 1
Cinnamic acid has antibacterial effect and can inhibit the activity of the neuraminidase, and substituent groups on benzene rings of the cinnamic acid have great influence on the physiological activity of the substances. The antibacterial ratio in example 1 was lower than that in comparative example 2 probably because the physiological activity of hydroxycinnamic acid was affected after the reaction with octanoyl chloride, and the antibacterial performance was affected.
Comparative example 4
Under the film preparation process conditions of comparative example 1, the PVA was controlled to be different in the kind of raw materials, and the other conditions were the same, so that films were prepared, and the conditions and results are shown in Table 2.
TABLE 2
As can be seen from table 2, the overall performance of PVA before modification was inferior compared to the examples, and PVA1799 due to the different degree of alcoholysis and degree of crosslinking occurring for different types of PVA: PVA 217=1: 1, the overall performance is best; the overall performance of pure PVA1799 and pure PVA217 is the worst.
Comparative example 5
Under the conditions of the film preparation process of example 1, the amounts of the acid chlorides were controlled to be different, and under the other conditions, the films were prepared under the same conditions, and the conditions and results are shown in Table 3.
TABLE 3 Table 3
As can be seen from Table 3, the film overall performance is best when the amount of acid chloride is 5%; when the amount of acyl chloride is smaller, the contact angle of the film is smaller and the water resistance is poorer because of less grafted long-chain alkyl; the usage amount of the acyl chloride is continuously increased to 7 percent, and the grafted acyl chloride reaches saturation at the moment, so that the overall performance of the film is reduced to a certain extent.
According to the invention, polyvinyl alcohol is used as a substrate material, and a hydroxy cinnamic acid compound and a long-chain acyl group are chemically grafted to obtain a waterproof and antibacterial polyvinyl alcohol film; wherein, the introduced hydroxycinnamic acid compound contains rigid benzene rings, hydroxyl groups and carboxyl groups, the hydroxyl number of the polyvinyl alcohol can be reduced through esterification reaction, the water resistance of the polyvinyl alcohol is enhanced, and meanwhile, the introduced long-chain hydrophobic substance further enhances the water resistance of the film and endows the film with antibacterial property.
The water resistance of the polyvinyl alcohol is improved, the number of hydrophilic hydroxyl groups is reduced, the effect of hydrophobic substances is fully exerted, and a chemical method is adopted to enable a modifier to react with the hydroxyl groups or coat low-surface-energy substances to achieve the super-hydrophobic effect; in addition, the rigid groups and long-chain hydrophobic monomers as hydrophobic substances can also be effective in improving the water repellency of the polymer films.
The hydroxycinnamic acid compounds are micromolecular phenolic acid substances beneficial to human bodies, are nontoxic and environment-friendly, have obvious antioxidation effect, and have the effects of resisting inflammation, bacteria, tumors and the like; the hydroxyl and carboxyl in the molecular structure ensure the possibility of chemical reaction, and can be used as a novel safe antibacterial agent for improving the defect that polyvinyl alcohol does not have antibacterial property.
It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, and it should be covered in the scope of the present invention.

Claims (10)

1. A preparation method of a polyvinyl alcohol film is characterized in that: comprising the steps of (a) a step of,
mixing a hydroxycinnamic acid compound with N, N-carbonyl diimidazole, adding a solvent, uniformly stirring, heating to 50-65 ℃ and reacting for 12-16 h to prepare a mixed solution;
adding polyvinyl alcohol into the mixed solution, stirring and reacting for 4-6 hours at 90-95 ℃, cooling to 30-40 ℃, adding acyl chloride into the reaction system, continuing to react for 2-4 hours, standing and scraping the film to obtain the polyvinyl alcohol film.
2. The method of manufacturing according to claim 1, wherein: the molar ratio of the hydroxycinnamic acid compound to the N, N-carbonyldiimidazole is 1:1.
3. The preparation method according to claim 1 or 2, characterized in that: the solvent comprises dimethyl sulfoxide.
4. A method of preparation as claimed in claim 3, wherein: the volume mass ratio of the solvent to the hydroxycinnamic acid compound is as follows in mL: g is 40:2-4.
5. The method of manufacturing according to claim 1, wherein: the mass ratio of the polyvinyl alcohol to the hydroxycinnamic acid compound is 1:1-2.
6. The method of manufacturing according to claim 1, wherein: the acyl chloride is one or more of octanoyl chloride, lauroyl chloride and palmitoyl chloride.
7. The method of claim 1 or 6, wherein: the acyl chloride accounts for 5-8% of the mass of the reaction system.
8. The method of manufacturing according to claim 1, wherein: the hydroxycinnamic acid compound is one or more of p-hydroxycinnamic acid, ferulic acid, caffeic acid and sinapic acid.
9. The method of manufacturing according to claim 1, wherein: and (3) standing, wherein the standing time is 12-24 h.
10. The polyvinyl alcohol film produced by the production process according to any one of claims 1 to 9.
CN202310573047.6A 2023-05-19 2023-05-19 Preparation method of polyvinyl alcohol film and product thereof Active CN116535546B (en)

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CN112451418A (en) * 2020-11-02 2021-03-09 江苏集萃先进高分子材料研究所有限公司 Nano-fiber mask containing liposome and preparation method thereof
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CN113480764A (en) * 2021-07-31 2021-10-08 贵州省材料产业技术研究院 Preparation method of enhanced polyvinyl alcohol antibacterial film and product thereof

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CN110559476B (en) * 2019-09-26 2020-10-16 浙江海洋大学 Liquid band-aid containing peptide anti-inflammatory active ingredients and preparation method thereof

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CN108586828A (en) * 2018-04-10 2018-09-28 南京农业大学 A kind of Compound Edible Coating for Preservation and its preparation method and application
CN112451418A (en) * 2020-11-02 2021-03-09 江苏集萃先进高分子材料研究所有限公司 Nano-fiber mask containing liposome and preparation method thereof
CN112812484A (en) * 2021-01-26 2021-05-18 侯龙辉 Antibacterial moisturizing degradable porous gel preservative film and preparation method thereof
CN113480764A (en) * 2021-07-31 2021-10-08 贵州省材料产业技术研究院 Preparation method of enhanced polyvinyl alcohol antibacterial film and product thereof

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