CN110302679A - Wet film of a kind of intelligence control and its preparation method and application - Google Patents
Wet film of a kind of intelligence control and its preparation method and application Download PDFInfo
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- CN110302679A CN110302679A CN201810231473.0A CN201810231473A CN110302679A CN 110302679 A CN110302679 A CN 110302679A CN 201810231473 A CN201810231473 A CN 201810231473A CN 110302679 A CN110302679 A CN 110302679A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
- B01D53/228—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion characterised by specific membranes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0079—Manufacture of membranes comprising organic and inorganic components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/10—Supported membranes; Membrane supports
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/38—Polyalkenylalcohols; Polyalkenylesters; Polyalkenylethers; Polyalkenylaldehydes; Polyalkenylketones; Polyalkenylacetals; Polyalkenylketals
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/40—Applications of laminates for particular packaging purposes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/48—Antimicrobial properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D2565/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D2565/38—Packaging materials of special type or form
- B65D2565/381—Details of packaging materials of special type or form
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Abstract
The invention belongs to function film fields, are related to wet film of a kind of intelligence control and its preparation method and application.It includes base and extra play that the intelligence, which controls wet film, and the extra play is located at base one or both sides；Wherein, the base is porous membrane, and the aperture of the porous membrane is 0.005-250 microns, porosity 30%-80%, and hole of the aperture within the scope of the positive and negative an order of magnitude of average pore size accounts for 50% or more of all well；The extra play is dense film, and material contains polyvinyl alcohol and metal salt and optional crosslinking agent and/or antibacterial agent.There is the wet film of intelligence control of the invention intelligence to control wet ability, fruits and vegetables humidity is kept when relative humidity is lower, increase moisture-inhibiting when relative humidity is higher to prevent fruit and vegetable moisture condensation from festering, and there is oxygen barrier property, the fruit and vegetable box that can be used for having fresh-keeping function and the refrigerator with fruit and vegetable preservation box.
Description
Technical field
The invention belongs to function film fields, control wet film and preparation method thereof more particularly, to a kind of intelligence and answer
With.
Background technique
Fruits and vegetables is the important food of the mankind, is that people obtain basic nutrition object (vitamin, minerals, composite carbon
Hydrate etc.) main source.Freshness requirement with the increasingly raising of people's living standard, to fresh fruit and vegetables
It is higher and higher.Fruits and vegetables remain to continue the vital movements such as breathing and transpiration after harvesting, and water can occur in storing process
Dispersion is become estranged the consumption of nutriment.Temperature is every to increase 10 DEG C, and fruits and vegetables respiratory intensity is increased by one times.Family's fruit and vegetable preserving method
It is that fruits and vegetables are placed in refrigerator to refrigerate, slows down fruits and vegetables breathing.In fruits and vegetables, moisture is important component, affects fruit and vegetable
Dish tenderness, freshness and taste.Ambient humidity, light and temperature is too low to will lead to fruits and vegetables loss of water and weightlessness, but the excessively high meeting of humidity is so that fruits and vegetables table
Face hydrogenesis, grows fungi, accelerates fruits and vegetables rotten and rotten.Therefore control fresh fruit of vegetables storage humidity is very
Important, it is beneficial to extend the fresh keeping time of fruits and vegetables.Using barrier film, the infiltration due to gases such as oxygen can be prevented,
Inhibit fresh fruit of vegetables respiration, is conducive to extend the fresh keeping time of fruits and vegetables.
Several functional films " temperature-sensitive moisture permeable membrane " on fruit and vegetable box for reducing moisture loss, " silicon filter in the market
Film ", the effect of " moisture permeable membrane " and unsatisfactory.Temperature-sensitive moisture permeable membrane film surface under high humidity low temperature is easy moisture condensation；Silicon filter
Film has moisture-keeping functions, but penetrability can not change with humidity；Moisture permeable membrane is that viscose solution is applied in paper-based substrate,
Performance meet the requirements but preparation process not environmentally, complex process, and it is exceeded to there may be in processing technology chlorinity
Problem.
CN105986511A disclose applied on the higher body paper of dry and wet intensity it is hydrophilic water conservation and good film-forming property it is natural
The technology of high molecular polymer, but cost is relatively high.CN104029449B discloses a kind of big vapor transfer rate coated film, and basal layer is
Eptfe membrane layer, coating are the ester emulsion copolymerized coating of polyurethane containing hemp stalk core super fine, the film
For automobile lamp shell, but do not have intelligence control wet performance.CN103507339A discloses a kind of moisture permeable membrane, which will
Regenerated cellulose is maintained in the substrate of non-woven fabrics, but does not have barrier gas performance.CN103107301A discloses a kind of nothing
Organic coating lithium ion battery separator includes multilayered structure, respectively porous flexible counterdie and the coating coated on counterdie two sides, applies
Layer includes polyvinyl alcohol and zeolite particles, and there is no metal salt components for the auxiliary element of the coating, and composite membrane does not have intelligence
Control wet function.CN1864829A discloses a kind of hydrophilic-hydrophobic bipolar composite membrane and preparation method thereof, which has the double-deck knot
Structure, bottom are porous support layer, and upper layer is the hydrophilic film of chloride containing lithium, which has high moisture-inhibiting and hinder by force other gas molecules
Gear effect, but it is moist not have intelligence control.WO2013066012A1 disclose a kind of perforated membrane containing inorganic particulate and
Comprising hydrophilic and hydrophobic substance Polymer Tie-layer, which is used to improve the thermal stability of lithium battery diaphragm, does not have intelligence
Control wet performance.WO2012133805A1 discloses a kind of moisture permeable membrane, porous substrate preferably polytetrafluoroethylene, price, and is somebody's turn to do
The high moisture-inhibiting performance of film is bad.US20030054155A1 discloses a kind of Waterproof Breathable composite membrane, and hydrophobic layer is polytetrafluoroethyl-ne
Alkene, hydrophilic layer are polyurethane, which has high moisture-inhibiting, but do not have intelligence control wet performance.
Summary of the invention
The purpose of the invention is to overcome drawbacks described above of the existing technology, provide a kind of intelligence control wet film,
Moisturizing in the case where low humidity has strong ventilating capability in the case where high humility, and has oxygen barrier property.The present invention
Further provide for the preparation method of the film, it is this method simple process, at low cost.Therefore, film provided by the invention is special
It is not suitably applied the fresh-keeping packaging of vegetable and fruit.
The first aspect of the present invention provides a kind of intelligence control wet film, including base and extra play, the extra play are located at
Base one or both sides；Wherein,
The base is porous membrane, and the aperture of the porous membrane is 0.005-250 microns, porosity 30%-
80%, hole of the aperture within the scope of the positive and negative an order of magnitude of average pore size accounts for 50% or more of all well；
The extra play be dense film, material contain polyvinyl alcohol and metal salt and optional crosslinking agent and/or
Antibacterial agent.
In the present invention, to realize that intelligence control is wet, the base need to be porous membrane, and the extra play need to be dense film.
The concept and term scope of the porous membrane and dense film are known to the skilled person.Dense thin as extra play
Film can be made by way of by the solution coating for containing additional layer component to substrate surface and drying.
According to the present invention, it is multilayer that the intelligence, which controls wet film, when intelligently controlling wet film is two layers, the extra play position
In base side, when intelligently controlling wet film is three layers, the extra play is located at base two sides, in case of need, described
It may be more than three layers of more layers that intelligence, which controls wet film, and extra play and base can be with arranged for interval.Wherein, the base is excellent
It is selected as single layer structure.
According to the present invention, the porous membrane for meeting features described above can be used, according to the present invention a kind of preferred embodiment,
The material of the base is paper and/or non-woven fabrics.The non-woven fabrics can be the porous membrane non-woven fabrics of any conventional commercial,
Preferably polypropylene non-woven fabric, polyethylene terephthalate non-woven fabrics, polyurethane non-woven fabrics and polytetrafluoroethylene (PTFE) non-woven fabrics
At least one of；Preferably polypropylene non-woven fabric and/or polyethylene terephthalate non-woven fabrics.
For the porous membrane of above-mentioned material, it is preferable that the aperture of the porous membrane is 0.2-200 microns, further
Preferably 0.5-20 microns, more preferably 0.6-10 microns, most preferably 0.8-2 microns；Porosity is 40%-70%；Aperture
Hole within the scope of the positive and negative an order of magnitude of average pore size accounts for 80% or more of all well.
In addition, the material of the porous membrane may be polyether aromatic phosphine porous membrane, including but not limited to: polysulfones gathers
At least one of ether sulfone, sulfonated polyether sulfone, phenolphthalein type polysulfones, polyether-ketone and sulfonated polyether ketone；Or for polyethylene, polypropylene,
At least one of polystyrene, poly terephthalic acid diol ester and polycaprolactam.
According to the present invention, the relative amount of the polyvinyl alcohol and metal salt is limited with that can form dense film, it is preferable that
On the basis of extra play total weight, the content of the polyvinyl alcohol is 50-99wt%, preferably 66-98wt%, further preferably
For 70-95wt%；The content of the metal salt is 1-50wt%, preferably 2-34wt%, further preferably 5-30wt%.
According to the present invention, the polyvinyl alcohol of higher molecular weight and alcoholysis degree is more advantageous to form dense film, it is preferable that institute
The weight average molecular weight for stating polyvinyl alcohol is 10000-500000, further preferably 20000-200000；Alcoholysis degree is preferably
70%-100%, further preferably 88%-99%.
According to the present invention, the metal salt is preferably soluble sulphate and/or soluble halide salt, further preferably
At least one of sodium sulphate, calcium chloride, lithium chloride, cesium fluoride, lithium bromide and lithium fluoride, more preferably sodium sulphate, calcium chloride,
At least one of lithium chloride and lithium fluoride.
According to the present invention, crosslinking agent and antibacterial agent be it is optional containing component, it is wet thin that the addition of crosslinking agent can be such that intelligence controls
Film has better oxygen barrier property, and the addition of antibacterial agent, which can make intelligence control wet film, has anti-microbial property.
On the basis of the total weight of the extra play, the content of the crosslinking agent is preferably 0-10wt%, further preferably
For 0.1-7wt%, further preferably 2-6wt%.The crosslinking agent is preferably formaldehyde, glyoxal, malonaldehyde, butanedial, penta
In at least one of dialdehyde, maleic acid, maleic anhydride and sulfuric acid, further preferably formaldehyde, glutaraldehyde and sulfuric acid at least
One kind, more preferably formaldehyde and sulfuric acid or glutaraldehyde and sulfuric acid, the crosslinking agent being used in compounding can further improve cross-linking efficiency
And cross-linking effect, wherein the amount ratio of formaldehyde or glutaraldehyde and sulfuric acid can be 2-5:1.
On the basis of the total weight of the extra play, the preferred content of the antibacterial agent is 0-20wt%, further preferably
For 0.1-10wt%.The antibacterial agent be preferably nano zine oxide, nano-titanium oxide, nano silver, Nanometer Copper, silk gum, quaternary ammonium salt,
In at least one of methyl hydroxybenzoate, potassium sorbate and chitosan, further preferably nano zine oxide, nano silver and quaternary ammonium salt
At least one, the quaternary ammonium salt is, for example, Cetylpyridinium Chloride.
Above-mentioned preferred component can get the film of more excellent moisture permeability and gas barrier property.
According to the present invention, the thickness of the base and extra play can determine as needed, generally, the thickness of the base
It can be 5-1000 microns, preferably 10-100 microns, further preferably 60-90 microns；The thickness of the extra play can be with
It is 0.5-100 microns, preferably 2-20 microns.
The second aspect of the present invention provides a kind of preparation method of the wet film of intelligence control, comprising the following steps:
(1) each component for the extra play that above-mentioned intelligence controls wet film is sufficiently dissolved or is dispersed in water, be configured to molten
Liquid or dispersion liquid；
(2) solution obtained in step (1) or dispersion liquid are coated on the one side that above-mentioned intelligence controls the base of wet film
Or two sides；The intelligence is obtained after drying controls wet film.
Solution obtained in step (1) or dispersion liquid can be coated on by base using any conventional coating method,
Including but not limited to: brushing, showering, spraying.
According to the present invention, the mass concentration of the solution in step (1) or dispersion liquid can be 0.5%-30%, preferably
1%-10%, further preferably 5%-10%.
According to the present invention, the temperature dried in step (2) can be 50 DEG C -100 DEG C, preferably 60 DEG C -90 DEG C.It can be normal
Baking step, such as baking oven are completed in the various heating devices of rule.The time of drying can determine as needed, for example, 5-30min.
According to the present invention, crosslinking agent can be added when preparing the solution or dispersion liquid of extra play, can also be after the drying
Individually coating, or be added in two steps on above-mentioned two opportunity.The step of being individually coated with after the drying includes: individually to match crosslinking agent
Solution or dispersion liquid is made, the one side of the film after the solution containing crosslinking agent or dispersion liquid to be coated on to the drying of step (2)
Or two sides, the intelligence is obtained after drying again controls wet film；The mass concentration of the solution containing crosslinking agent or dispersion liquid
Preferably 0.5%-10%, further preferably 1%-5%.The condition dried again can be identical as first time drying condition.
The third aspect of the present invention provides above-mentioned intelligence and controls wet film and/or intelligently control as made from above-mentioned preparation method wet
Application of the film in vegetable and fruit fresh-keeping packaging.
There is the wet film of intelligence control of the invention intelligence to control wet ability, and fruits and vegetables humidity is kept when relative humidity is lower,
Increase moisture-inhibiting when relative humidity is higher to prevent fruit and vegetable moisture condensation from festering, and there is oxygen barrier property, can be used for having
There are the fruit and vegetable box of fresh-keeping function and the refrigerator with fruit and vegetable preservation box.
Other features and advantages of the present invention will then part of the detailed description can be specified.
Specific embodiment
The preferred embodiment of the present invention is described in more detail below.
Intelligence controls the base of wet film and the thickness of extra play is measured by six water chestnut calibrator of Shanghai；Pore structure includes aperture
It is measured with porosity by mercury injection method, using instrument AutoporeIII-9420 type mercury injection apparatus.
Polypropylene non-woven fabric, Liaoning hundred million step grand, white nonwoven polypropylene fabric.
Ethylene terephthalate non-woven fabrics, Yangzhou Rong Wei, terylene spun-bonded hot rolling non-woven fabric, white.
Fine and close polypropylene double-way stretched film, middle petrochemical industry Zhenghai refinery, F280Z.
Polyvinyl alcohol A, western Gansu Province chemical industry, trade mark PVA124, weight average molecular weight 105000, alcoholysis degree 99%.
Polyvinyl alcohol B, western Gansu Province chemical industry, trade mark PVA1788, weight average molecular weight 74800, alcoholysis degree 88%.
Lithium chloride, lark prestige, 99%.
Lithium fluoride, lark prestige, purity 99.9%.
Sodium sulphate, Sinopharm Chemical Reagent Co., Ltd. analyze pure.
Calcium chloride, lark prestige, purity 98%.
Aluminium oxide, lark prestige, purity 90%.
Nano zine oxide, lark prestige, 99.5%, partial size 10-30nm.
Nano silver, lark prestige, 99.5%, partial size 10-30nm.
Formaldehyde, lark prestige, 50% aqueous solution.
Glutaraldehyde, lark prestige, 50% aqueous solution.
Glyoxal, lark prestige, 50% aqueous solution.
Sulfuric acid, Sinopharm Chemical Reagent Co., Ltd. analyze pure.
Embodiment 1
7g polyvinyl alcohol A is added in 100mL distilled water, is sufficiently dissolved.Then 2.1g sodium sulphate, 0.2g is nano oxidized
Zinc, 0.35g glutaraldehyde and 0.1g sulfuric acid add in acquired solution, are stirred well to uniformly mixed, obtain coating liquid.This is applied
Covering liquid is equably brushed in polypropylene non-woven fabric one side, is then placed it in baking oven, is dried 10min at 70 DEG C, obtain intelligence
Wet film A1 can be controlled, groundwork thickness is 75 microns, and aperture is 1.05 microns, porosity 52%, aperture average pore size just
Hole in negative one number order magnitude range accounts for 85% of all well or more；Additional layer thickness is 9 microns.
Comparative example 1
Film is prepared according to method same as Example 1, unlike, sodium sulphate is not contained in coating liquid, is obtained thin
Film D1.
Comparative example 2
Film is prepared according to method same as Example 1, unlike, porous polypropylene non-woven fabric is not used, and
Using fine and close polypropylene double-way stretched film, film D2 is obtained.
Embodiment 2
7g polyvinyl alcohol A is added in 100mL distilled water, is sufficiently dissolved.Then 1g lithium fluoride, 0.2g is nano oxidized
Zinc, 0.4g formaldehyde and 0.1g sulfuric acid add in acquired solution, are stirred well to uniformly mixed, obtain coating liquid.This is coated
Liquid is equably brushed in polyethylene terephthalate non-woven fabrics one side, is then placed it in baking oven, is dried at 60 DEG C
12min obtains intelligence and controls wet film A2, and groundwork thickness is 80 microns, and aperture is 0.95 micron, porosity 50%, aperture
Hole within the scope of the positive and negative an order of magnitude of average pore size accounts for 70% or more of all well；Additional layer thickness is 9 microns.
Embodiment 3
6g polyvinyl alcohol A is added in 100mL distilled water, is sufficiently dissolved.Then 0.32g calcium chloride is added, 0.2g receives
Meter Yin, is stirred well to uniformly mixed, obtains coating liquid.This coating liquid is equably brushed in polyethylene terephthalate
Non-woven fabrics two sides, then places it in baking oven, dries 8min at 80 DEG C, the film after being dried, and will contain 0.2g first
The 10mL aqueous solution of aldehyde and 0.1g sulfuric acid equably brushes film two sides after the drying, dries 8min at 80 DEG C, obtains intelligence
Wet film A3 can be controlled, groundwork thickness is 80 microns, and aperture is 0.95 micron, porosity 50%, aperture average pore size just
Hole in negative one number order magnitude range accounts for 70%% of all well or more；Additional layer thickness is 9 microns.
Embodiment 4
Film is prepared according to method same as Example 1, unlike, glutaraldehyde and sulfuric acid are not contained in coating liquid,
It obtains intelligence and controls wet film A4.
Embodiment 5
6.5g polyvinyl alcohol B is added in 100mL distilled water, sufficiently dissolves, it is nano oxidized to add 1g lithium chloride, 0.2g
Zinc, 0.3g glutaraldehyde and 0.1g sulfuric acid, are stirred well to uniformly mixed, obtain coating liquid.This coating liquid is equably brushed
It in polypropylene non-woven fabric one side, then places it in baking oven, dries 10min at 70 DEG C, obtain intelligence and control wet film A5,
Groundwork thickness is 75 microns, and aperture is 1.05 microns, and porosity 52%, aperture is in the positive and negative an order of magnitude range of average pore size
Interior hole accounts for 85% of all well or more；Additional layer thickness is 10 microns.
Comparative example 3
Prepare film according to method same as Example 5, unlike, with etc. the aluminium oxide of weight replace lithium chloride,
Obtain film D3.
Embodiment 6
Prepare film according to method same as Example 2, unlike, with etc. the glyoxals of weight replace formaldehyde, obtain
Wet film A6 is controlled to intelligence.
Test case
According to GB/T 1037-1988, moisture-vapor transmission test is carried out to above-mentioned film, is 25 DEG C in test temperature, thoroughly
It crosses under the test condition that surface humidity is respectively 50% and 90%, obtains the steam penetrating capacity (g/ of daily every square metre of film
m2/ day), data result is shown in Table 1.
Gas barrier property detection is carried out to above-mentioned film according to GB/T 19789-2005, obtains OTR oxygen transmission rate
[cm3·cm/(cm2SPa)], data result is shown in Table 1.
Table 1: the penetrability and gas barrier property test result of film
| Serial number | Moisture permeability (50%RH) | Moisture permeability (90%RH) | Gas barrier property (O2) |
| A1 | 124 | 1644 | 5.2×10-5 |
| D1 | 24 | 329 | 1.6×10-5 |
| D2 | 9 | 14 | 3.0×10-6 |
| A2 | 109 | 1467 | 5.4×10-5 |
| A3 | 118 | 1555 | 3.4×10-5 |
| A4 | 145 | 1672 | 2.3×10-4 |
| A5 | 111 | 1557 | 5.8×10-5 |
| D3 | 95 | 1125 | 5.7×10-5 |
| A6 | 102 | 1387 | 6.1×10-5 |
Seen from table 1, the wet film of intelligence control of the invention has good oxygen-barrier property, and there is intelligence to control wet energy
Power, i.e., when humidity is lower, which is reduced, and the ability with moisturizing can keep fruits and vegetables humidity；Instead
It, at high humidity, which improves, and has strong ventilating capability, thus prevents fruit and vegetable
Moisture condensation is festered.
Various embodiments of the present invention are described above, above description is exemplary, and non-exclusive, and
It is not limited to disclosed each embodiment.Without departing from the scope and spirit of illustrated each embodiment, for this skill
Many modifications and changes are obvious for the those of ordinary skill in art field.
Claims (17)
1. a kind of intelligence controls wet film, including base and extra play, the extra play are located at base one or both sides；Wherein,
The base is porous membrane, and the aperture of the porous membrane is 0.005-250 microns, porosity 30%-80%, hole
Hole of the diameter within the scope of the positive and negative an order of magnitude of average pore size accounts for 50% or more of all well；
The extra play is dense film, and material contains polyvinyl alcohol and metal salt and optional crosslinking agent and/or antibacterial
Agent.
2. intelligence according to claim 1 controls wet film, wherein the aperture of the porous membrane is 0.2-200 microns, excellent
It is selected as 0.5-20 microns；Porosity is 40%-70%；Hole of the aperture within the scope of the positive and negative an order of magnitude of average pore size accounts for whole
80% or more of hole.
3. intelligence according to claim 1 controls wet film, wherein the material of the base is paper and/or non-woven fabrics.
4. intelligence according to claim 3 controls wet film, wherein the non-woven fabrics is polypropylene non-woven fabric, gathers to benzene two
At least one of formic acid glycol ester non-woven fabrics, polyurethane non-woven fabrics and polytetrafluoroethylene (PTFE) non-woven fabrics；Preferably polypropylene without
Woven fabric and/or polyethylene terephthalate non-woven fabrics.
5. intelligence according to claim 1 controls wet film, wherein on the basis of extra play total weight, the polyvinyl alcohol
Content be 50-99wt%, preferably 66-98wt%, the content of the metal salt is 1-50wt%, preferably 2-34wt%.
6. intelligence according to claim 1 controls wet film, wherein the weight average molecular weight of the polyvinyl alcohol is 10000-
500000, preferably 20000-200000；Alcoholysis degree is 70%-100%, preferably 88%-99%.
7. intelligence according to claim 1 controls wet film, wherein the metal salt is soluble sulphate and/or solvable
Property halide salt, preferably at least one of sodium sulphate, calcium chloride, lithium chloride, cesium fluoride, lithium bromide and lithium fluoride, further
Preferably at least one of sodium sulphate, calcium chloride, lithium chloride and lithium fluoride.
8. intelligence according to any one of claims 1-7 controls wet film, wherein the total weight with the extra play is
Benchmark, the content of the crosslinking agent are 0-10wt%, preferably 0.1-7wt%.
9. intelligence according to any one of claims 1-7 controls wet film, wherein the crosslinking agent is formaldehyde, second two
At least one of aldehyde, malonaldehyde, butanedial, glutaraldehyde, maleic acid, maleic anhydride and sulfuric acid, preferably formaldehyde, glutaraldehyde and
At least one of sulfuric acid.
10. intelligence according to any one of claims 1-7 controls wet film, wherein with the total weight of the extra play
On the basis of, the content of the antibacterial agent is 0-20wt%, preferably 0.1-10wt%.
11. intelligence according to any one of claims 1-7 controls wet film, wherein the antibacterial agent is nano oxidized
At least one in zinc, nano-titanium oxide, nano silver, Nanometer Copper, silk gum, quaternary ammonium salt, methyl hydroxybenzoate, potassium sorbate and chitosan
Kind, preferably at least one of nano zine oxide, nano silver and quaternary ammonium salt.
12. intelligence according to any one of claims 1-7 controls wet film, wherein the base with a thickness of 5-
1000 microns, preferably 10-100 microns；The extra play with a thickness of 0.5-100 microns, preferably 2-20 microns.
13. the preparation method that a kind of intelligence controls wet film, comprising the following steps:
(1) each component that the intelligence as described in any one of claim 1-12 is controlled to the extra play of wet film sufficiently dissolve or
Person is dispersed in water, and is configured to solution or dispersion liquid；
(2) solution obtained in step (1) or dispersion liquid are coated on to the intelligence as described in any one of claim 1-12
The one or both sides of the base of wet film can be controlled；The intelligence is obtained after drying controls wet film.
14. preparation method according to claim 13, wherein the mass concentration of solution or dispersion liquid in step (1)
For 0.5%-30%, preferably 1%-10%.
15. preparation method according to claim 13, wherein the temperature dried in step (2) is 50 DEG C -100 DEG C, preferably
It is 60 DEG C -90 DEG C.
16. preparation method described in any one of 3-15 according to claim 1, wherein crosslinking agent is individually configured to solution
Or dispersion liquid, the one or both sides of the film after the solution containing crosslinking agent or dispersion liquid to be coated on to the drying of step (2), then
The intelligence is obtained after secondary drying controls wet film；The mass concentration of the solution containing crosslinking agent or dispersion liquid is preferably
0.5%-10%, further preferably 1%-5%.
17. the wet film of intelligence control described in any one of claim 1-12 and/or by any one of claim 13-16
Application of the wet film in vegetable and fruit fresh-keeping packaging is intelligently controlled made from the preparation method.
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| CN201810231473.0A CN110302679A (en) | 2018-03-20 | 2018-03-20 | Wet film of a kind of intelligence control and its preparation method and application |
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Application publication date: 20191008 |