CN114539694A - Foam type water-soluble packaging film and preparation method thereof - Google Patents
Foam type water-soluble packaging film and preparation method thereof Download PDFInfo
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- CN114539694A CN114539694A CN202110385188.6A CN202110385188A CN114539694A CN 114539694 A CN114539694 A CN 114539694A CN 202110385188 A CN202110385188 A CN 202110385188A CN 114539694 A CN114539694 A CN 114539694A
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- 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
- C08J9/0014—Use of organic additives
- C08J9/0033—Use of organic additives containing sulfur
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- 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
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- 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
- C08J9/0014—Use of organic additives
- C08J9/0023—Use of organic additives containing oxygen
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- 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
- C08J9/0095—Mixtures of at least two compounding ingredients belonging to different one-dot groups
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- 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
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- 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
- C08J2439/00—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 a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen; Derivatives of such polymers
- C08J2439/04—Homopolymers or copolymers of monomers containing heterocyclic rings having nitrogen as ring member
- C08J2439/06—Homopolymers or copolymers of N-vinyl-pyrrolidones
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- 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
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/80—Packaging reuse or recycling, e.g. of multilayer packaging
Abstract
The invention relates to the technical field of packaging, in particular to a foam type water-soluble packaging film and a preparation method thereof. Which comprises a water-soluble matrix and air bubbles uniformly distributed in the water-soluble matrix; the diameter of the air bubble is smaller than the thickness of the water-soluble packaging film; the volume of the air bubbles accounts for 5-80% of the total volume of the water-soluble matrix; the raw material of the water-soluble matrix comprises polyvinyl alcohol. According to the invention, the water-soluble property and the mechanical property of the water-soluble packaging film are effectively improved through the components, the proportion and the bubble content of the water-soluble matrix, so that the transverse tensile strength and the longitudinal tensile strength are not lower than 11MPa and even can exceed 12.5MPa, and the transverse tensile elongation and the longitudinal tensile elongation can exceed 55%, thereby being beneficial to improving the water-soluble property of the film and simultaneously considering the processability of the water-soluble packaging film in the packaging operation, widening the use condition and expanding the application range.
Description
Technical Field
The invention relates to the technical field of packaging, in particular to a foam type water-soluble packaging film and a preparation method thereof.
Background
The plastic packaging bag which is commonly used in daily life is taken as a packaging material, belongs to a disposable packaging article, has low price, is widely applied to the packaging of various products in daily life, and is particularly used for packaging chemical industry products, such as pesticides, chemical fertilizers, dyes, water treatment agents, concrete reinforcing materials, chemical reagents for gardening care and the like; however, the used plastic packaging bags are not only not easy to degrade, but also contain a large amount of residual polluting chemicals, and the polluting waste plastic packaging bags easily cause secondary pollution and seriously pollute the environment. Therefore, some polluting chemicals are quantitatively packaged by adopting the packaging bags made of water-soluble materials, and the water-soluble packaging mode ensures that the chemicals can be quantitatively metered and quantitatively put in without unpacking, simplifies the operation processes of dosing and mixing, effectively isolates and avoids operators from directly contacting the chemicals, and provides effective safety protection for operators. The water-soluble packaging film is completely dissolved in water, so that no waste with pollutants is generated in the using process of pesticides and chemicals.
At present, the water-soluble material of the water-soluble packaging bag is generally a polyvinyl alcohol film thin material, and the water-soluble packaging mode requires that the polyvinyl alcohol film can be dissolved in water at low temperature and the water solubility is fast and thorough. Therefore, the current solution is basically to adjust the water solubility of the polyvinyl alcohol film by the material or the formulation. Some inventors have also proposed some new solutions to the above problem, for example in US8309203B2 disclosing a water-soluble matrix with improved sensitivity to water before immersion in water by providing water-insoluble particles partially embedded in the water-soluble matrix. However, in order to obtain better water solubility, the water-soluble matrix has 33-167 g/m2And a thickness in the range of 25 to 125 microns, which also affects the mechanical properties such as processability, heat sealability, etc., in addition to increasing the sensitivity of the matrix to moisture and humidity. US patent 3695989B1 proposes foamed films and cold water soluble packages prepared from foamed films of polyvinyl alcohol, polyvinyl pyrrolidone, or a mixture of the two, for packaging powdered materials. The package containing the powdered material can be placed directly in water, enabling the user to precisely control the amount of feed without touching the contents of the package. On the basis, Chinese patent CN110869289A applied by Holland union Lihua Limited discloses a water-soluble packaging film, the thickness of the water-soluble film is 30-250 microns, wherein gas The volume of the bubbles accounts for 80-99% of the total volume of the matrix, and although the water solubility of the packaging bag is improved, the mechanical property and the processing property of the water-soluble film can be greatly reduced due to the large content of the bubbles.
Therefore, there is a need to develop a foam type water-soluble packaging film which has good cold water solubility, processability in packaging operation and relatively simple production process.
Disclosure of Invention
In view of the above technical problems, a first aspect of the present invention provides a foam-type water-soluble packaging film comprising a water-soluble matrix and air bubbles uniformly distributed in the water-soluble matrix; the diameter of the air bubble is smaller than the thickness of the water-soluble packaging film; the volume of the air bubbles accounts for 5-80% of the total volume of the water-soluble matrix; the raw material of the water-soluble matrix comprises polyvinyl alcohol.
As a preferable technical scheme of the invention, the preparation raw material of the water-soluble matrix also comprises a surfactant, and the content of the surfactant is not less than 5 wt% of the total weight of the preparation raw material.
As a preferable technical scheme of the invention, the preparation raw materials of the water-soluble matrix comprise the following components in percentage by mass:
in a preferred embodiment of the present invention, the polyvinyl alcohol has a weight average molecular weight of not more than 10 ten thousand.
As a preferable technical scheme of the invention, the unit area weight of the water-soluble matrix is 10-300 g/m2。
As a preferable technical scheme of the invention, the thickness of the water-soluble matrix is 25-300 mu m.
In a preferred embodiment of the present invention, the surfactant is a nonionic surfactant and/or an anionic surfactant.
As a preferable technical scheme of the invention, the waterThe density of the soluble packaging film is 0.2-1.15 g/cm3。
As a preferable technical scheme of the invention, the tensile strength of the water-soluble packaging film is not lower than 9.50 MPa.
The second aspect of the present invention provides a method for preparing the foam-type water-soluble packaging film as described above, comprising the steps of:
(1) stirring and mixing a plasticizer, a surfactant, an inorganic filler, a water-soluble polymer and water in a reaction kettle;
(2) adding polyvinyl alcohol, heating to 90 ℃, and carrying out heat preservation treatment for 1-3 hours to obtain a mixture;
(3) and forming glue solution containing air bubbles in a bubble making device by the mixture, casting to form a film, and drying to obtain the foam-free rubber.
Has the advantages that: the mechanical property of the water-soluble packaging film is effectively improved by regulating and controlling the components and the proportion of the water-soluble matrix, so that the transverse tensile strength and the longitudinal tensile strength of the water-soluble packaging film are not lower than 11MPa and even can exceed 12.5MPa, and the transverse tensile elongation and the longitudinal tensile elongation of the water-soluble packaging film can exceed 55 percent, thereby being beneficial to improving the processability of the water-soluble packaging film during packaging operation, widening the use condition and expanding the application range. In addition, the mechanical strength of the water-soluble packaging film is improved, and the water-soluble packaging film is beneficial to improving the processing performance of the water-soluble packaging film, so that the processing and the production are smoother, the film breaking times in the processing and the production process are reduced, the production cost is reduced, and the production efficiency is improved. Meanwhile, the water solubility of the water-soluble packaging film is not sacrificed, the water-soluble packaging film can be completely dissolved in cold water at the temperature of about 5 ℃ within about 5 minutes, and the normal use is not influenced.
Detailed Description
The present invention will be more readily understood by reference to the following detailed description of preferred embodiments of the invention and the examples included therein. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control.
The terms "comprises," "comprising," "includes," "including," "has," "having," "contains," "containing," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion. For example, a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.
When an amount, concentration, or other value or parameter is expressed as a range, preferred range, or as a range of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, when a range of "1 to 5" is disclosed, the described range should be interpreted to include the ranges "1 to 4", "1 to 3", "1 to 2 and 4 to 5", "1 to 3 and 5", and the like. When a range of values is described herein, unless otherwise stated, the range is intended to include the endpoints thereof and all integers and fractions within the range.
In addition, the indefinite articles "a" and "an" preceding an element or component of the invention are intended to have no limitation on the number (i.e., number of occurrences) of the element or component. Thus, "a" or "an" should be read to include one or at least one, and the singular form of an element or component also includes the plural unless the number clearly indicates the singular.
The words "preferred", "preferably", "further", "more preferred", and the like, in the context of this invention, refer to embodiments of the invention that may provide certain benefits, under certain circumstances. However, other embodiments may be preferred, under the same or other circumstances. Furthermore, the recitation of one or more preferred embodiments does not imply that other embodiments are not useful, nor is it intended to exclude other embodiments from the scope of the invention.
A first aspect of the present invention provides a foam-type water-soluble packaging film comprising a water-soluble matrix and air bubbles uniformly distributed in the water-soluble matrix; the diameter of the air bubble is smaller than the thickness of the water-soluble packaging film; the volume of the air bubbles accounts for 5-80% of the total volume of the water-soluble matrix; the raw material of the water-soluble matrix comprises polyvinyl alcohol.
The bubbles in the present invention are uniformly distributed in the water-soluble matrix, and the specific shape and structure thereof are not particularly limited, including but not limited to various spherical, ellipsoidal, irregular, and the like bubbles.
The water-soluble packaging film is used for preparing packaging structures for packaging or containing various materials, the packaging or containing materials are not particularly limited in the invention, and can be various products such as various detergents, disinfectants, pesticides and the like, and the appearance shapes of the materials are not particularly limited, and include but are not limited to powder, particle tablets, granules and the like. In addition, the packaging structure of the packaging film is not particularly limited, and the packaging film can be made into various packaging bags, sacks, containers, packaging bags and the like with different shapes or structures.
The water-soluble packaging film of the present invention includes a water-soluble matrix that, in use, can be dissolved in water to release the material or composition encapsulated within the water-soluble packaging film. The sealing packaging method of the water-soluble packaging film is not specially limited, and the water-soluble packaging film can be sealed by heat sealing, solvent welding, solvent or wet sealing and the like; preferably, heat sealing is used.
The thickness of the water-soluble matrix is 25-300 mu m; preferably, the thickness of the water-soluble matrix is 30-250 mu m; further preferably, the thickness of the water-soluble matrix is 35-120 μm.
In some embodiments, the water-soluble matrix has a weight per unit area of not less than 10g/m2。
Preferably, the water-soluble matrix has a weight per unit area of not less than 20g/m2。
Further preferably, the water-soluble base has a weight per unit area of not more than 120g/m2。
More preferably, the water-soluble matrix has a weight per unit area of 20 to 100g/m2。
More preferably, the water-soluble matrix has a weight per unit area of 30 to 90g/m2。
The raw material for preparing the water-soluble matrix comprises polyvinyl alcohol (PVA), and the water-soluble matrix in the invention can also be one or a combination of more of water-soluble materials such as modified polyvinyl alcohol, polyvinyl acetate, carboxymethyl cellulose, hydroxypropyl cellulose and the like.
In some embodiments, the polyvinyl alcohol has a weight average molecular weight of no greater than 10 ten thousand. The weight average molecular weight in the present invention is a general physical and chemical parameter of polyvinyl alcohol, and can be measured according to a method known to those skilled in the art. In some embodiments, the polyvinyl alcohol has a weight average molecular weight of 3 to 10 ten thousand; preferably 4 to 8 ten thousand.
In some embodiments, the degree of alcoholysis of the polyvinyl alcohol is from 60 to 99%. The alcoholysis degree in this application refers to the percentage of hydroxyl groups in the product obtained after alcoholysis of polyvinyl alcohol relative to the original groups, and can be prepared according to methods well known to those skilled in the art.
In some embodiments, the raw materials for the preparation of the water-soluble matrix further comprise a surfactant in an amount of not less than 5 wt% based on the total weight of the raw materials for preparation.
Further, the content of the surfactant is not higher than 15 wt% of the total preparation raw material weight.
Further preferably, the content of the surfactant is 5-10 wt% of the total weight of the preparation raw materials.
The surfactant in the present invention is a component that uniformly disperses components such as polyvinyl alcohol and a plasticizer in a water-soluble base in water, promotes the film-forming component such as polyvinyl alcohol to generate uniform bubbles in a bubbler, and stabilizes the generated bubbles. The specific type of the surfactant in the present invention is not particularly limited, and various surfactants known to those skilled in the art can be used.
In some embodiments, the surfactant is a nonionic surfactant and/or an anionic surfactant.
The anionic surfactant in the present invention refers to a surfactant having a negative charge in part and having a surface active effect after ionization in water, and is called an anionic surfactant. Specific types of the anionic surfactant in the present invention are not particularly limited, and include, but are not limited to, carboxylate anionic surfactants, sulfonate anionic surfactants, sulfate anionic surfactants, and phosphate anionic surfactants.
The anionic surfactant of the present invention may comprise one or more sulfate or sulfonate groups; the sulfonate anionic surfactant may optionally comprise one or more sulfate or carboxylate groups; and, the sulfate anionic surfactant may optionally further comprise one or more carboxylate or sulfonate groups.
Anionic surfactants that may be used include, but are not limited to, alkyl sulfates, alkyl ether sulfates, alkylamidoether sulfates, alkylaryl polyether sulfates, monoglyceride sulfates, alkyl sulfonates or alpha-olefin sulfonates, alkylamide sulfonates, alkylaryl sulfonates, paraffin sulfonates, alkyl sulfosuccinates, alkyl ether sulfosuccinates, alkylamide sulfosuccinates, alkyl sulfoacetates, acyl sarcosinates, acyl glutamates, alkyl sulfosuccinamates, acyl isethionates and N-acyl taurates, salts of alkyl mono-and polyglycosides, acyl lactylates, N-acyl glycinates, salts of D-galactoside-uronic acids, salts of alkyl ether carboxylic acids, alkylaryl ether carboxylates, salts of alkylamidoether carboxylic acids, salts of alkyl ether carboxylic acids, salts of alkyl ester-sulfosuccinates, alkyl ester sulfonates, alkyl sulfosuccinates, alkyl ester salts, alkyl sarcosinates, acyl sarcosinates, salts of N-acyl glycinates, salts of D-galactoside-uronic acids, salts of alkyl ether carboxylic acids, salts of acylamidoether carboxylic acids, salts of alpha-olefin sulfonates of alpha-olefins, salts of alpha-olefins, and salts of alpha-olefins, Sulfoacetates, sulfolaurates and the corresponding non-salt forms of all these compounds, the alkyl and acyl groups of all these compounds containing from 6 to 40 carbon atoms, in particular from 14 to 30 carbon atoms, more preferably from 16 to 22 carbon atoms; and aryl means a phenyl group. These compounds may be ethoxylated and preferably contain from 1 to 50 ethylene oxide units and the like.
More preferably, the anionic surfactant is selected from the group consisting of (C6-C24) acyl isethionates, (C6-C24) acyl isethionates, alpha-olefin sulfonates, their basic salts, and mixtures thereof.
The nonionic surfactant in the invention is a surfactant which contains an ether group which is not dissociated in an aqueous solution as a main hydrophilic group in a molecule, and the surface activity of the surfactant is represented by neutral molecules. In the present invention, the kind and specific selection of the nonionic surfactant are not particularly limited, and a polyoxyethylene nonionic surfactant can be selected. Specific examples include, but are not limited to, polyoxyalkylene alkyl ethers and polyoxyalkylene alkylphenyl ethers (e.g., diethylene glycol monomethyl ether, diethylene glycol diethyl ether, polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene nonylphenyl ether), ethylene oxide-propylene oxide block copolymers, sorbitan fatty acid esters (e.g., sorbitan monolaurate, sorbitan monooleate, sorbitan trioleate), sorbitan polyoxyethylene fatty acid esters (e.g., polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monooleate, polyoxyethylene sorbitan trioleate), sorbitol polyoxyethylene fatty acid esters (e.g., polyoxyethylene sorbitan tetraoleate), glycerol fatty acid esters (e.g., glycerol monooleate), glycerol polyoxyethylene fatty acid esters (e.g., glycerol polyoxyethylene monostearate, glycerol monostearate, propylene oxide, and the like, Polyoxyethylene glyceryl monooleate), polyoxyethylene fatty acid esters (such as polyethylene glycol monolaurate, polyethylene glycol monooleate), polyoxyethylene alkylamines and acetylenic diols (such as the adduct of 2, 4, 7, 9-tetramethyl-5-decyne-4, 7-diol and the diol with ethylene oxide or propylene oxide), alkylolamides (such as the condensation products of coconut oil acid, lauric acid, and the like with ethanolamine, diethanolamine, triethanolamine, and the like), polyol esters (ethylene glycol monostearate or distearate, propylene glycol monostearate, propylene glycol alginate, glycerol monostearate, and distearate), nonionic fluorocarbon surfactants, and the like.
In some embodiments, the raw materials for preparing the water-soluble matrix comprise the following components in percentage by mass:
the water-soluble polymer is used for improving the low-temperature solubility of the basement membrane, and is one or more of sodium polyacrylate, polyacrylamide, polyethylene oxide, native starch, modified starch (oxidized starch, carboxymethyl starch, phosphate ester starch, pre-gelatinized starch and the like), polyacrylic acid, polymaleic anhydride, polyquaternary ammonium salt, polyethyleneimine, polyvinylpyrrolidone, dextrin, chitosan, chitin, dextrin, hydroxymethyl cellulose, carboxymethyl cellulose and gelatin.
The inorganic filler is used for the disintegration speed of the basement membrane during dissolution, and the inorganic filler is one or more of talcum powder, attapulgite, silicon dioxide, diatomite, kaolin, mica powder, calcium sulfate, barium sulfate, sodium sulfate, calcium carbonate, bentonite and montmorillonite.
The plasticizer is used for plasticizing a film forming agent component (PVA and the like) in a matrix raw material and reducing the processing temperature of the matrix raw material. The specific kind and selection of the plasticizer are not particularly limited in the present invention, and various kinds of alcohols or epoxy compounds known in the art may be used as the plasticizer. Mention may be made, without being limited thereto, of glycerol, diglycerol, isopropylglycerol, sorbitol, methylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, propylene glycol, polyethylene glycol, neopentyl glycol, trimethylolpropane, polyether polyols, ethanolamine and mixtures thereof.
In the invention, on the premise of not reducing the comprehensive performance of the water-soluble packaging film, other functional additives can be added according to actual needs, wherein the functional additives include but are not limited to flame retardants, antioxidants, ultraviolet absorbers, antibacterial agents, pigments, delustering agents, heat stabilizers, weather-resistant agents, antistatic agents, anti-coloring agents and the like.
The flame retardant is not particularly limited, and examples thereof include: guanidine phosphate, ammonium phosphate, melamine phosphate, triphenyl phosphate, tris (2, 3-dichloropropyl) phosphate, ammonium polyphosphate, phosphate, tricresyl phosphate, trichloroethyl phosphoric acid, and the like. The antioxidant is not particularly limited, and there may be mentioned: and antioxidants such as phosphorus compounds including copper compounds, organic or inorganic halogen compounds, hindered phenols, hindered amines, hydrazines, sulfur compounds, sodium hypophosphite, potassium hypophosphite, calcium hypophosphite, and magnesium hypophosphite. The ultraviolet absorber is not particularly limited, and there may be mentioned: benzotriazole-based ultraviolet absorbers such as 2- (2-hydroxy-5-methylphenyl) benzotriazole, 2- (2-hydroxy-5-butylphenyl) benzotriazole, 2- (2-hydroxy-5-octylphenyl) benzotriazole, 2- (3-tert-butyl-2-hydroxy-5-methylphenyl) -5-chlorobenzotriazole, and 2- (3, 5-di-tert-amyl-2-hydroxyphenyl) benzotriazole. The antibacterial agent is not particularly limited, and there may be mentioned: silver ion antibacterial agent, zinc oxide, copper oxide, ammonium dihydrogen phosphate, lithium carbonate, acylaniline, imidazole, thiazole, isothiazolone derivative, quaternary ammonium salt, biguanidine, phenolic formic acid, sorbic acid, organic iodine, nitrile, thiocyanide, copper agent, trihalogenated allyl compound, organic nitrogen-sulfur compound, chitin, mustard, castor oil and horseradish. The heat stabilizer is not particularly limited, and there may be mentioned: the heat stabilizer comprises basic lead salts, metal soaps, organic tin, organic compounds, polyhydric alcohols and composite stabilizers. The antifungal agent is not particularly limited, and there may be mentioned: pentachlorophenol, sodium pentachlorophenol, pentachlorophenol laurate, salicylanilide, copper 8-hydroxyquinoline, bis (tri-N-butyltin) oxide, bis (tributyltin) sulfide, tributyltin acetate, tributyltin chloride, tributyltin fumarate, tributyltin fluoride, N- (trichloromethylthio) phthalimide, N- (trichloromethylthio) -4-cyclohexene-1, 2-dicarboximide, and the like. The antistatic agent is not particularly limited, and there may be mentioned: stearamidopropyl dimethyl-beta-hydroxyethylammonium nitrate, (3-lauramidopropyl) trimethylammonium methyl sulfate, N-bis (2-hydroxyethyl) -N- (3 '-dodecyloxy-2' -hydroxypropyl) methylammonium methyl sulfate, N- (3-dodecyloxy-2-hydroxypropyl) ethanolamine, triethylenemmonium methyl sulfate, and the like.
In some embodiments, the water-soluble packaging film has a density of 0.4 to 0.9g/cm3。
Preferably, the density of the water-soluble packaging film is 0.5-0.7 g/cm3。
More preferably, the density of the water-soluble packaging film is 0.6g/cm3。
The density of the water-soluble packaging film of the present invention was measured according to the following method.
The film density test method comprises the following steps:
the cutting area is 100cm2Weighing the weight m of the square film, measuring the thickness of 5 points in the longitudinal direction and the transverse direction of the square film by using a thickness meter, and then taking an average value d; the density calculation method is as follows:
density (ρ) ═ m/(d 100)
In some embodiments, the water-soluble packaging film has a tensile strength of not less than 9.50 MPa.
Preferably, the tensile strength of the water-soluble packaging film is not lower than 10.50 MPa.
Further, the tensile strength of the water-soluble packaging film is not less than 11.0 MPa.
The tensile strength in the present invention includes the transverse direction tensile strength and the longitudinal direction tensile strength of the film. The tensile strength in the invention is obtained by testing according to the GB/T1040-2006 tensile property test method.
In some embodiments, the water-soluble packaging film has an elongation at break of no less than 50%.
Preferably, the water-soluble packaging film has an elongation at break of not less than 55%.
The elongation at break in the present invention includes a transverse elongation at break and a longitudinal elongation at break. The elongation at break in the invention is obtained by testing according to the GB/T1040-2006 tensile property test method.
The second aspect of the present invention provides a method for preparing the foam-type water-soluble packaging film as described above, comprising the steps of:
(1) stirring and mixing a plasticizer, a surfactant, an inorganic filler, a water-soluble polymer and water in a reaction kettle;
(2) adding polyvinyl alcohol, heating to 90 ℃, and carrying out heat preservation treatment for 1-3 hours to obtain a mixture;
(3) and forming glue solution containing air bubbles in a bubble making device by the mixture, casting to form a film, and drying to obtain the foam-free rubber.
Further:
(1) putting plasticizer, surfactant, inorganic filler, water-soluble polymer and water into a reaction kettle, and uniformly stirring
(2) Slowly adding PVA while stirring, wherein the stirring speed is 500 r/min; and raising the temperature to 90 ℃ and preserving the heat for 1.5 h.
(3) Stirring at a low speed until defoaming is completed
(4) And (3) conveying the mixture to a foam maker through a pipeline, forming glue solution containing uniform bubbles through the foam maker, and drying in a casting mode to obtain the foam PVA film.
The water-soluble packaging film can be used for packaging pesticides, fertilizers, dyes, water treatment agents, concrete reinforcing materials, chemical agents for horticultural care and the like, is not specially limited in application field and use method, and can be used according to actual needs.
The present invention will be specifically described below by way of examples. It should be noted that the following examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and that the insubstantial modifications and adaptations of the present invention by those skilled in the art based on the above disclosure are still within the scope of the present invention.
Examples
Example 1: the present embodiment provides a foam-type water-soluble packaging film comprising a water-soluble matrix and air bubbles uniformly distributed in the water-soluble matrix; the diameter of the air bubble is smaller than the thickness of the water-soluble packaging film; the volume of the air bubbles accounts for 55% of the total volume of the water-soluble matrix; the foam type water-soluble packaging film comprises the following components in parts by weight:
wherein the weight average molecular weight of the polyvinyl alcohol is 7.5 ten thousand, and the alcoholysis degree is 88%; the surfactant is a mixture of sodium dodecyl ether sulfosuccinate and polyoxyethylene stearyl ether, and the weight ratio is 2: 1; the plasticizer is sorbitol and glycerin, and the weight ratio is 1: 1.
the foam type water-soluble packaging film is prepared by the following method:
(1) putting polyvinylpyrrolidone, talcum powder, plasticizer, surfactant and water into a reaction kettle, and uniformly stirring;
(2) Slowly adding PVA, and stirring while adding materials, wherein the stirring speed is 500 r/min; heating to 90 ℃, and preserving the heat for 1.5 hours;
(3) slowly stirring until defoaming is completed;
(4) and (3) conveying the mixture to a foam maker through a pipeline, forming glue solution containing uniform bubbles through the foam maker, and drying in a casting mode to obtain the foam PVA film.
Wherein the volume of the air bubbles accounts for 50% of the total volume of the water-soluble matrix, and the weight per unit area of the water-soluble matrix is 40g/m2The heat-sealing temperature of the film was 155 ℃ and the water content was 6.35%.
Example 2: the present embodiment provides a foam-type water-soluble packaging film comprising a water-soluble matrix and air bubbles uniformly distributed in the water-soluble matrix; the diameter of the air bubble is smaller than the thickness of the water-soluble packaging film; the volume of the air bubbles accounts for 35% of the total volume of the water-soluble matrix; the foam type water-soluble packaging film comprises the following components in parts by weight:
wherein the weight average molecular weight of the polyvinyl alcohol is 7 ten thousand, and the alcoholysis degree is 88%; the surfactant is a mixture of sodium dodecyl ether sulfosuccinate and polyoxyethylene stearyl ether, and the weight ratio is 2: 1; the plasticizer is sorbitol and glycerin, and the weight ratio is 1: 1.
The foam type water-soluble packaging film is prepared by the following method:
(1) putting polyvinylpyrrolidone, talcum powder, plasticizer, surfactant and water into a reaction kettle, and uniformly stirring;
(2) slowly adding PVA while stirring, wherein the stirring speed is 500 r/min; heating to 90 ℃, and keeping the temperature for 1.5 h;
(3) stirring at a low speed until defoaming is completed;
(4) and (3) conveying the mixture to a foam maker through a pipeline, forming glue solution containing uniform bubbles through the foam maker, and drying in a casting mode to obtain the foam PVA film.
Wherein the volume of the air bubbles accounts for 35% of the total volume of the water-soluble matrix, and the weight per unit area of the water-soluble matrix is 52g/m2The heat-sealing temperature of the film was 160 ℃ and the water content was 6.51%.
Example 3: the present embodiment provides a foam-type water-soluble packaging film comprising a water-soluble matrix and air bubbles uniformly distributed in the water-soluble matrix; the diameter of the air bubble is smaller than the thickness of the water-soluble packaging film; the volume of the air bubbles accounts for 70% of the total volume of the water-soluble matrix; the foam type water-soluble packaging film comprises the following components in parts by weight:
wherein the weight average molecular weight of the polyvinyl alcohol is 6.5 ten thousand, and the alcoholysis degree is 88%; the surfactant is a mixture of sodium dodecyl ether sulfosuccinate and polyoxyethylene stearyl ether, and the weight ratio is 2: 1; the plasticizer is sorbitol and glycerin, and the weight ratio is 1: 1.
The foam type water-soluble packaging film is prepared by the following method:
(1) putting polyvinylpyrrolidone, talcum powder, plasticizer, surfactant and water into a reaction kettle, and uniformly stirring;
(2) slowly adding PVA while stirring, wherein the stirring speed is 500 r/min; heating to 90 ℃, and keeping the temperature for 1.5 h;
(3) stirring at a low speed until defoaming is completed;
(4) and (3) conveying the mixture to a foam maker through a pipeline, forming glue solution containing uniform bubbles through the foam maker, and drying in a casting mode to obtain the foam PVA film.
Wherein the volume of the air bubbles accounts for 60% of the total volume of the water-soluble matrix, and the weight per unit area of the water-soluble matrix is 32g/m2The heat-sealing temperature of the film was 155 ℃ and the water content was 6.23%.
Example 4: the present embodiment provides a foam-type water-soluble packaging film comprising a water-soluble matrix and air bubbles uniformly distributed in the water-soluble matrix; the diameter of the air bubble is smaller than the thickness of the water-soluble packaging film; the volume of the air bubbles accounts for 85% of the total volume of the water-soluble matrix; the preparation raw materials of the water-soluble matrix comprise the following components in parts by weight:
wherein the weight average molecular weight of the polyvinyl alcohol is 7.5 ten thousand, and the alcoholysis degree is 88%; the surfactant is sodium dodecyl ether sulfosuccinate; the plasticizer is sorbitol and glycerin, and the weight ratio is 1: 1.
The foam type water-soluble packaging film is prepared by the following method:
(1) putting polyvinylpyrrolidone, talcum powder, plasticizer, surfactant and water into a reaction kettle, and uniformly stirring;
(2) slowly adding PVA while stirring, wherein the stirring speed is 500 r/min; heating to 90 ℃, and preserving the heat for 1.5 hours;
(3) stirring at a low speed until defoaming is completed;
(4) and (3) conveying the mixture to a foam maker through a pipeline, forming glue solution containing uniform bubbles through the foam maker, and drying in a casting mode to obtain the foam PVA film.
Wherein the volume of the air bubbles accounts for 70% of the total volume of the water-soluble matrix, and the weight per unit area of the water-soluble matrix is 24g/m2The heat sealing temperature of the film was 150 ℃ and the water content was 6.55%.
Example 5: the present embodiment provides a foam-type water-soluble packaging film comprising a water-soluble matrix and air bubbles uniformly distributed in the water-soluble matrix; the diameter of the air bubble is smaller than the thickness of the water-soluble packaging film; the volume of the air bubbles accounts for 95% of the total volume of the water-soluble matrix; the foam type water-soluble packaging film comprises the following components in parts by weight:
wherein the weight average molecular weight of the polyvinyl alcohol is 7.5 ten thousand, and the alcoholysis degree is 88%; the surfactant is a mixture of sodium dodecyl ether sulfosuccinate and polyoxyethylene stearyl ether, and the weight ratio is 2: 1; the plasticizer is sorbitol and glycerin, and the weight ratio is 1: 1.
The foam type water-soluble packaging film is prepared by the following method:
(1) putting polyvinylpyrrolidone, talcum powder, plasticizer, surfactant and water into a reaction kettle, and uniformly stirring;
(2) slowly adding PVA while stirring, wherein the stirring speed is 500 r/min; heating to 90 ℃, and keeping the temperature for 1.5 h;
(3) stirring at a low speed until defoaming is completed;
(4) and (3) conveying the mixture to a foam maker through a pipeline, forming glue solution containing uniform bubbles through the foam maker, and drying in a casting mode to obtain the foam PVA film.
Wherein, theThe volume of the air bubbles is 80% of the total volume of the water-soluble matrix, and the weight per unit area of the water-soluble matrix is 20g/m2The heat-sealing temperature of the film was 145 ℃ and the water content was 6.43%.
The applicant tested the performance parameters of the above-mentioned foamed water-soluble packaging film, and the test results are shown in table 1 below.
Table 1 results of performance testing
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | |
| Film Density | 0.6g/cm3 | 0.9g/cm3 | 0.4g/cm3 | 0.3g/cm3 | 0.2g/cm3 |
| Tensile Strength (longitudinal) | 12.53MPa | 13.91MPa | 10.12MPa | 8.67MPa | 6.44MPa |
| Tensile Strength-transverse Direction | 11.48MPa | 13.22MPa | 9.45MPa | 7.98MPa | 6.01MPa |
| Elongation-longitudinal direction | 57.28％ | 59.64％ | 48.19％ | 44.37％ | 36.46％ |
| Elongation-transverse direction | 61.02％ | 64.88％ | 52.79％ | 46.34％ | 39.02％ |
| Water dissolution time (5 ℃ C.) | 342s | 389s | 313s | 267s | 246s |
The foregoing examples are merely illustrative and serve to explain some of the features of the method of the present invention. The appended claims are intended to claim as broad a scope as is contemplated, and the examples presented herein are merely illustrative of selected implementations in accordance with all possible combinations of examples. Accordingly, it is applicants' intention that the appended claims are not to be limited by the choice of examples illustrating features of the invention. Also, where numerical ranges are used in the claims, subranges therein are included, and variations in these ranges are also to be construed as possible being covered by the appended claims.
Claims (10)
1. A foam-type water-soluble packaging film, which is characterized by comprising a water-soluble matrix and air bubbles uniformly distributed in the water-soluble matrix; the diameter of the air bubble is smaller than the thickness of the water-soluble packaging film; the volume of the air bubbles accounts for 5-80% of the total volume of the water-soluble matrix; the raw material of the water-soluble matrix comprises polyvinyl alcohol.
2. The foamed water-soluble packaging film according to claim 1, wherein the raw materials for preparing the water-soluble matrix further comprise a surfactant, and the surfactant is contained in an amount of not less than 5 wt% based on the total weight of the raw materials for preparing the water-soluble matrix.
3. The foam type water-soluble packaging film as claimed in claim 2, wherein the water-soluble matrix is prepared from the following raw materials in percentage by mass:
4. the foamed water-soluble packaging film according to claim 1, wherein the polyvinyl alcohol has a weight average molecular weight of not more than 10 ten thousand.
5. The foamed water-soluble packaging film according to claim 1, wherein the water-soluble matrix has a weight per unit area of 10 to 300g/m2。
6. The foamed water-soluble packaging film according to claim 1, wherein the water-soluble matrix has a thickness of 25 to 300 μm.
7. The foamed water-soluble packaging film according to claim 2, wherein the surfactant is a nonionic surfactant and/or an anionic surfactant.
8. The foamed water-soluble packaging film according to any one of claims 1 to 7, wherein the density of the water-soluble packaging film is 0.2 to 1.15g/cm3。
9. The foam-type water-soluble packaging film according to any one of claims 1 to 7, wherein the water-soluble packaging film has a tensile strength of not less than 9.50 MPa.
10. The method for preparing the foam type water-soluble packaging film according to any one of claims 3 to 9, characterized by comprising the steps of:
(1) stirring and mixing a plasticizer, a surfactant, an inorganic filler, a water-soluble polymer and water in a reaction kettle;
(2) adding polyvinyl alcohol, heating to 90 ℃, and carrying out heat preservation treatment for 1-3 hours to obtain a mixture;
(3) and forming glue solution containing air bubbles in a bubble making device by the mixture, casting to form a film, and drying to obtain the foam-free rubber.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3695989A (en) * | 1970-08-12 | 1972-10-03 | Robert E Albert | Cold water soluble foam plastic package |
| CN110869289A (en) * | 2017-07-07 | 2020-03-06 | 荷兰联合利华有限公司 | Water soluble package |
| CN111051210A (en) * | 2017-07-07 | 2020-04-21 | 荷兰联合利华有限公司 | Water soluble package |
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2021
- 2021-04-09 CN CN202110385188.6A patent/CN114539694A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3695989A (en) * | 1970-08-12 | 1972-10-03 | Robert E Albert | Cold water soluble foam plastic package |
| CN110869289A (en) * | 2017-07-07 | 2020-03-06 | 荷兰联合利华有限公司 | Water soluble package |
| CN111051210A (en) * | 2017-07-07 | 2020-04-21 | 荷兰联合利华有限公司 | Water soluble package |
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| Title |
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| 梁光启等编著: "《砂浆实验及检测培训教材》", 中国建材工业出版社, pages: 121 * |
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