CN102924855A - Controllable-respiration preservative film and preparation method thereof - Google Patents
Controllable-respiration preservative film and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a controllable-respiration preservative film and a preparation method thereof. The method comprises the following steps: dissolving a water-soluble polyhydroxy plasticizer in water, adding the reaction raw material, heating until the raw material is completely dissolved in water, dispersing at high speed, and cooling to 50-70 DEG C to prepare a solution for running filming; and running the solution for running filming onto a steel belt on a running production line via a die head, and drying to obtain the controllable-respiration preservative film. The controllable-respiration preservative film is prepared from the reaction raw materials in percentage by mass: 60-80% of polyvinyl alcohol, 10-30% of water-soluble polyhydroxy plasticizer, 1-5% of moisture respiration regulator, 1-3% of compatilizer, 3-10% of water retention agent and 0.5-3% of assistant. The preservative film has high barrier property for oxygen and nitrogen sources; the bidirectional permeation exchange power for moisture can be effectively regulated and controlled through the raw material formula; and thus, the preservative film can ensure free respiration and moisture exchange of fruits and vegetables in the preservation process.
Description
Technical field
The present invention relates to a kind of preservative film, particularly relate to a kind of controlled breathing preservative film and preparation method thereof.Be suitable for the fresh-keeping of daily fruit, vegetables and food and storage.Especially be fit to the fresh-keeping of fresh fruit and vegetables and storage.
Technical background
Fresh fruits and vegetables is after picking, in fact its biological activity still exists, so g and D that under physical environment, is also continuing, this also is why a lot of fruits and vegetables can become aging after picking placement for some time, and makes fruits and vegetables lose mouthfeel and nutrient; Served fruit and vegetables itself have profuse nutrition, so also often parasitic and rotten and rotten by microorganism and bacterium.The aging, rotten and rotten of fruits and vegetables is the problem that the fruit freshness preserving most critical need to solve.
Biological continued growth and growth be unable to do without the underlying conditions such as moisture content, oxygen and nitrogenous source; And the parasitism of microorganism and bacterium needs moisture content, oxygen and nitrogenous source too.
The fresh-keeping most use chemical substance of more existing fruits and vegetables is processed and is realized the fresh-keeping of fruits and vegetables, thus the chemical substance that easily is used for processing in fruits and vegetables remained on surface and absorption, and affect security and the wholesomeness of fruits and vegetables.Realize the breathing of fruits and vegetables such as most the employing in the preservative film punching of existing preservative film, because hole is excessive, dehydration is serious so cause fruits and vegetables moisture content to volatilize too fast, so compole was short when fresh-keeping and keeping-freshness storage was guaranteed the quality, also because by the direct ingress of air of hole, rot so easily be subjected to the effect accelerating maturing of airborne oxygen source and nitrogenous source.
Summary of the invention
Purpose of the present invention is exactly to be to overcome some defectives of existing in the existing preservation technique and the problem of dangerous, unhygienic property, provides a kind of good refreshing effect, controlled breathing preservative film that fresh keeping time is long and preparation method thereof.
Preservative film of the present invention need not just can realize in preservative film punching freely the breathing of fruits and vegetables of sealed packing; and this preservative film has the strong barrier property to oxygen, realizes for a long time fresh-keeping and guarantee the quality so can protect for a long time fruits and vegetables not accelerated the ripening by airborne dioxygen oxidation.The preservative film of this controlled breathing of simultaneously the present invention has again high bidirectional permeability energy to aqueous vapor, so just can realize that by the humidity of selecting the preservative film outside atmosphere fruits and vegetables breathes normally the certain moisture content of release and keeps the fruits and vegetables surface dry, and the moisture content that is unlikely to allow microorganism or bacterium that g and D is arranged exists; Simultaneously this preservative film has again high barrier, and fruits and vegetables and microorganism or bacterial growth and essential oxygen source, the nitrogenous source of growth are effectively intercepted, and does not occur spoiled and rotten with regard to the long-time storage that realizes fruits and vegetables fully like this.Reach the fresh-keeping of safety and sanitation and environmental protection.
The object of the invention is achieved through the following technical solutions:
A kind of preparation method of controlled breathing preservative film, it is characterized in that, first water-soluble poly-hydroxy class softening agent is dissolved in the 3-6 times of water of prescription composition gross weight, then add polyvinyl alcohol, moisture content respiratory regulation agent, moisturizing water-holding agent, increase-volume compatilizer and auxiliary agent, and be heated to 90-95 ℃ complete soluble in water, high speed dispersion 30-60 minute, be cooled to 50-70 ℃, prepare the solution for casting film-forming; Gained is used for the solution of casting film-forming through the steel band of die head curtain coating to the curtain coating production line, and the dry baking tunnel that passes through again 120-180 ℃ is dried to controlled breathing preservative film;
Or water-soluble poly-hydroxy class softening agent, polyvinyl alcohol, moisture content respiratory regulation agent, moisturizing water-holding agent, increase-volume compatilizer and auxiliary agent added homogenizer mix, discharging by twin screw extruder at 160-180 ℃ of extruding pelletization; Then through forcing machine 160-180 ℃ of extrusion-blown modling film forming;
By mass percentage, consisting of of reaction raw materials: polyvinyl alcohol 60-80%, water-soluble poly-hydroxy class softening agent 10-30%, moisture content respiratory regulation agent 1-5%, increase-volume compatilizer 1-3%, moisturizing water-holding agent 3-10%, auxiliary agent 0.5-3%;
Described water-soluble poly-hydroxy class softening agent is water-soluble polyol or the water-soluble poly-hydroxy class material that contains the above nontoxic free from extraneous odour of two hydroxyls or two hydroxyls;
Described moisture content respiratory regulation agent is water-soluble or the dispersible nonionic surface active agent of water, has characteristic hydrophilic, that do not absorb water in physical environment;
Described increase-volume compatilizer refers to the nonionogenic tenside of hydrophile-lipophile balance value 〉=9;
Described auxiliary agent is one or more in superfine talcum powder, ultra-fine precipitates method white carbon black, aerosil, micronized polyethylene wax and the superfine polypropylene wax powder;
Described moisturizing water-holding agent is Zulkovsky starch, gelatin, treated starch ether or modified cellulose ethers.
In described selection of auxiliary superfine talcum powder, ultra-fine precipitates method white carbon black, aerosil, micronized polyethylene wax and the superfine polypropylene wax powder one or more; After such superfine powder is dispersed in the film, can allow film surface form certain uneven, and these uneven just can making at the film surface very thin layer of air of absorption are realized isolation between film and the film, thereby reach adhesion and easy opening between the film.
The moisturizing water-holding agent is selected Zulkovsky starch, gelatin, treated starch ether or modified cellulose ethers.Such material has certain high molecular, is to belong to a kind of natural modified high-molecular material, all has a large amount of polar groups on chemical structure: such as hydrophilic groups such as hydroxyl, carboxyls, all be have water-soluble.Because this class material is the macromole with high molecular, so under the condition that has moisture content to exist, can allow a large amount of water moleculess enter into the molecular chain of these materials, and under dry environment, can from these macromolecular chains, discharge, because these materials have a large amount of polar groups, so absorption and the releasing water molecule in all be a slowly process, just this adsorb slowly and discharge be only the water conservation of wanting required for the present invention and moisture-keeping functions.
Further, the polymerization degree of described polyvinyl alcohol is that 500-2400, alcoholysis degree are 80%-99%.
Described polyvinyl alcohol is one or more in polyvinyl alcohol 0588, polyvinyl alcohol 0580, polyvinyl alcohol 1788, polyvinyl alcohol 2088, polyvinyl alcohol 2288, polyvinyl alcohol 2488 and polyvinyl alcohol 1799, polyvinyl alcohol 2099, polyvinyl alcohol 2299 and the polyvinyl alcohol 2499.Polyvinyl alcohol has high barrier to oxygen, nitrogen, and particularly the polyvinyl alcohol of complete alcoholysis almost is zero to the transmitance of oxygen and nitrogen at normal temperatures, namely fully blocking oxygen and nitrogen; Simultaneously, the transmitance that steam and ammonia etc. is had again superelevation.
Described water-soluble poly-hydroxy class softening agent is one or more in glycerol, polyoxyethylene glycol-200, PEG-4000, PEG-6000, Polyethylene glycol-2000, PEG-4000 and PEG-6000 0, sorbyl alcohol and the TriMethylolPropane(TMP).This water-soluble poly-hydroxy softening agent is nonpoisonous and tasteless.This class poly-hydroxy class material and major ingredient polyvinyl alcohol have the similarity on the chemical structure, and the major ingredient polyvinyl alcohol all has splendid consistency; Enter as low molecular polyhydroxy substance simultaneously and can effectively unfold the polyvinyl alcohol macromolecular chain behind the polyvinyl alcohol and reach plasticization effect, and make polyvinyl alcohol realize that soft flexible reaches the plasticising purpose.
Described moisture content respiratory regulation agent is Tripolyglycerol monostearates, six Polyglycerine monostearates, ten Polyglycerine, six stearates, the trimerization glyceryl monooleate, the trimerization glyceryl monolaurate, propylene glycol monostearate, propylene glycol mono-oleate, Rikemal PL 100, glyceryl monolaurate, glyceryl monostearate, the Stearinsaeure double glyceride, monoolein, the polyoxyethylene dioleate, the TEG monoleate, the polyoxypropylene stearate, the anhydrous sorbitol laurate, the polyoxyethylene oxypropylene oleic acid ester, polyoxypropylene N.F,USP MANNITOL dioleate, polyoxyethylene (5EO) wool alcohol ether or polyoxyethylene fatty acid.The lipophilicity of such material is stronger than wetting ability, in film, has hydrophilic but not water-soluble characteristic, can seal to a certain extent the passage of some release moisture content in the film, thereby and the speed that control moisture content discharges by film reaches the adjusting fruits and vegetables are breathed release moisture content by film intensity.
Described increase-volume compatilizer is Vinlub 73, polyoxyethylene laurel ether, polyoxyethylene (4EO) sorbitan mono-laurate, polyoxyethylene (24EO) cholesterol ethers, polyoxypropylene (20PO) wool alcohol ether, polyoxyethylene 20 sorbitan monolaurate, polyoxyethylene (20EO) sorbitan monostearate, polyoxyethylene (16EO) wool alcohol ether, polyoxyethylene (20EO) sorbitan monooleate, the polyoxyethylene glycol monopalmitate, polyoxyl 40 stearate, Vinlub 73 or polyoxyethylene (20EO) sorbitan mono-laurate.This class material is the higher nonionogenic tenside of a class hydrophile-lipophile balance value, and the higher tensio-active agent of hydrophile-lipophile balance value all has higher compatibilization, mainly is to come homogeneous dispersion by this class tensio-active agent some are not easy the material that disperses in water-based system.
By percentage to the quality, the solid content of described solution for casting film-forming is 15-25%.The solid content of the best of described solution for casting film-forming is about 20%.Solution solid content concentration is too low, and the efficient of moulding film forming is low, and the viscosity of the too high solution of solid content concentration is high, is unfavorable for froth breaking and the casting film-forming of solution.
A kind of controlled breathing preservative film: it is prepared by aforesaid method.
The moisturizing water-holding agent not only possesses well water-soluble, and can reach very high water retention after water-soluble.
Auxiliary agent comprises film opening agent, antiblocking agent etc.Mainly be ultra-fine inert inorganic powder and macromolecule wax powder of inertia etc.As: superfine talcum powder, ultra-fine precipitates method white carbon black, aerosil, micronized polyethylene wax and superfine polypropylene wax powder etc.
Compare with existing preservative film, the present invention has following advantageous feature:
1, uses preservative film of the present invention, do not need to use any chemical substance and sanitas that fruits and vegetables is processed, so the fruits and vegetables surface can residual any chemical substance, make the safer health of fruits and vegetables;
2, the preservative film of the present invention preparation have superpower to barrier properties such as oxygen, nitrogen, carbonic acid gas, not oxidated and ripe mashed and addle so the fruits and vegetables after the packing can be deposited for a long time;
3, preservative film of the present invention is except the strong obstruct to obnoxious flavour, but can keep the very high amount of penetrating to penetrating of aqueous vapor, be unlikely to macerate mashedly because of moisture content so the fruits and vegetables after the packing can freely breathe, long storage time can keep the dry and comfortable of fruits and vegetables surface always;
4, because preservative film of the present invention has the two-way ability that sees through of very high aqueous vapor, so under suitable temperature and humidity envrionment conditions, can continue to maintain again the moisture content of fruits and vegetables when can guarantee the fruits and vegetables surface dry, the fruits and vegetables percentage of water loss of standing storage is low, has accomplished real fresh-keeping and guarantee the quality;
5, preservative film of the present invention is kind of a Green Product, can naturally be hydrolyzed and degraded in physical environment after the use, can not produce detrimentally affect to the water quality in the physical environment and soil property;
6, easy to use, get final product wanting fresh-keeping fruits and vegetables directly to pack with preservative film in the use, and need not special processing;
7, the fruits and vegetables after packing with preservative film of the present invention need not special refrigerated condition and just can reach very long fresh-keeping guaranteeing the quality the time;
8, preservative film of the present invention can design according to the respiratory intensity of different fruits and vegetables, reaches the fresh-keeping of the controlled breathing of fruits and vegetables and guarantees the quality.The preservative film of the present invention's preparation is to be applicable to the daily fresh-keeping preservative film of fruits and vegetables kind, especially is difficult to fresh-keeping green vegetable kind for some, has excellent fresh-keeping effect such as green vegetables kinds such as cabbage heart, Chinese cabbages.The preservative film of kind of high effective green environmentally friendly, very easy to use and safety and sanitation.
Embodiment
The invention will be further described below in conjunction with embodiment, but the invention process method is not limited to this.
Embodiment 1(aqueous solution curtain coating method)
The respectively metering of above each group, first soluble in water glycerol and TriMethylolPropane(TMP), then polyvinyl alcohol 2099 and polyvinyl alcohol 1788, propylene glycol monostearate, polyoxyethylene laurel ether, Xylo-Mucine, superfine talcum powder are added to the water, and be heated to 95 ℃ complete soluble in water, high speed dispersion 30 minutes, be cooled to 60 ℃, prepare the solution for casting film-forming.The solution of preparation is cast on the steel band through casting head, through 120-180 ℃ drying tunnel drying and forming-film.120-180 ℃ drying tunnel drying and forming-film refers to the scope that drying tunnel is sectional temperature-controlled, and the temperature of four drying zones is respectively: 120 ℃, 150 ℃, 180 ℃ and 160 ℃.
In the above-mentioned prescription, the consumption of Xylo-Mucine is three kinds of situations, adds respectively, and other raw materials are constant, add respectively Xylo-Mucine 0.6Kg, 1.0Kg and 1.6Kg, prepare preservative film 1,2, No. 3.At normal temperatures, its OTR oxygen transmission rate is respectively: 0.00676cm
3/ m
2/ 24h/, 0.00714cm
3/ m
2/ 24h/, 0.00829cm
3/ m
2/ 24h/(25 ℃, relative humidity: 60%; Testing method is pressed the ASTMD3985-1995 standard); Water vapor transmittance is respectively: 96.5gH
2O/m
2/ 24h, 110.2gH
2O/m
2/ 24h, 127.3gH
2O/m
2/ 24h(testing method is pressed the GB1037-1988 standard); 90 days biological rate of decomposition 〉=60%(testing standards of preservative film: GB/T 20197-2006; ISO14855:1999)
With the preservative film 1 of this embodiment preparation, the cabbage heart that packs respectively 300g 2, No. 3, under the condition of 5 ℃/relative humidity RH-50%, store after seven days, the percentage of water loss that detects the fresh-keeping cabbage heart of 1,2, No. 3 preservative film is respectively: 17.6%, 14.9% and 12.1%; The cabbage heart surface dry is without any withered and yellow and rotten.As a comparison test, under identical condition, the percentage of water loss after seven days is 73.9% without the cabbage heart of preservative film packing, just occurs the part greenery without the cabbage heart of preservative film packing at the 3rd day withered and yellow.
The present invention realizes preservative film to the controlled breathing of moisture content by the consumption that changes the moisturizing water-holding agent, thereby reaches the breathing of vegetables moisture content, and realizes the fresh-keeping of vegetables and guarantee the quality to be effective and obvious.
Embodiment 2(aqueous solution curtain coating method)
The respectively metering of above each group, first soluble in water glycerol, polyoxyethylene glycol-200 and PEG-4000, then polyvinyl alcohol 1799, glyceryl monostearate, Vinlub 73, gelatin, ultra-fine precipitates method white carbon black are added to the water, and be heated to 95 ℃ complete soluble in water, high speed dispersion 30 minutes, be cooled to 50 ℃, prepare the solution for casting film-forming.The solution of preparation is cast on the steel band through casting head, through 120-180 ℃ drying tunnel drying and forming-film.120-180 ℃ drying tunnel drying and forming-film refers to the scope that drying tunnel is sectional temperature-controlled, and the temperature of four drying zones is respectively: 120 ℃, 150 ℃, 180 ℃ and 160 ℃.
In the above-mentioned prescription, the consumption of gelatin is three kinds of situations, adds respectively, and other raw materials are constant, add respectively gelatin 0.4Kg, 0.8Kg and 1.2Kg, prepare preservative film 1,2, No. 3.
With the preservative film 1 of this embodiment preparation, the longan that packs respectively 100g 2, No. 3, under the condition of 5 ℃/relative humidity RH-30%, store after one month, detect the percentage of water loss of the fresh-keeping longan of 1,2, No. 3 preservative film, percentage of water loss is respectively: 13.6%, 11.9% and 9.1%; The longan surface dry rots without any; Because causing the cracking rate of Pericarpium Longan, dehydration is respectively: 5.4%, 4.8% and 3.2%; Mouthfeel remains unchanged substantially.As the simultaneous test of the present embodiment, under identical condition, the percentage of water loss after month is 21.9%, is 87.1% because dehydration causes the Pericarpium Longan cracking rate without the longan of preservative film packing.
The present invention realizes preservative film to the controlled breathing of moisture content by the consumption of change moisturizing water-holding agent gelatin, thereby reaches the respiratory control of longan moisture content, and realizes the fresh-keeping of longan and guarantee the quality to be effectively with obvious.
Embodiment 3(extrusion by melting)
Above each the group respectively the metering, then enter homogenizer and mix 20 minutes, discharging by twin screw extruder at 160-180 ℃ of extruding pelletization.Then through forcing machine 160-180 ℃ of extrusion-blown modling film forming.Discharging refers to that at 160-180 ℃ of extruding pelletization each section heated for controlling temperature scope of twin screw extruder sleeve and die head is respectively: a district: 160 ℃ by twin screw extruder; Two districts: 165 ℃; Three districts: 170 ℃; Four districts: 175 ℃, five districts: 180 ℃; Six districts: 180 ℃; Get to know: 170 ℃.Forcing machine refers to that 160-180 ℃ of extrusion-blown modling film forming the extruder temperature of blown film divides four sections heated for controlling temperatures: 160 ℃, 170 ℃, 180 ℃ and 175 ℃, and the extrusion-blown modling film forming
Under the condition that other raw materials of above-mentioned prescription are constant and the preparation method is constant, add respectively Zulkovsky starch 10Kg, 16Kg and 20Kg and prepare preservative film 1,2, No. 3.
With the preservative film 1 of the method preparation, the cabbage heart that packs respectively 500g 2, No. 3, under the condition of 8 ℃/relative humidity RH-30%, the percentage of water loss that stores after seven days is respectively: 23.8%, 21.6% and 20.3%; The cabbage heart surface dry is without any flavescence and rotten.And without the cabbage heart of preservative film packing under identical condition, the percentage of water loss after seven days is 78.3%, just occurs greenery without the cabbage heart of preservative film packing at second day withered and yellow.
Embodiment 4(aqueous solution curtain coating method)
The respectively metering of above each group, first soluble in water glycerol and TriMethylolPropane(TMP), then polyvinyl alcohol 2099 and polyvinyl alcohol 1788, propylene glycol monostearate, polyoxyethylene laurel ether, Xylo-Mucine, superfine talcum powder are added to the water, and be heated to 95 ℃ complete soluble in water, high speed dispersion 30 minutes, be cooled to 70 ℃, prepare the solution for casting film-forming.The solution of preparation is cast on the steel band through casting head, through the drying tunnel drying and forming-film of 120-180 ℃ (scope that drying tunnel is sectional temperature-controlled, the temperature of four drying zones is: 120 ℃, 150 ℃, 180 ℃ and 160 ℃).
This preservative film at normal temperatures, its OTR oxygen transmission rate is: 0.00923cm3/m2/24h/(25 ℃, relative humidity: 60%; Testing method is pressed the ASTMD3985-1995 standard); Water vapor transmittance is: 109.6gH
2O/m
2/ 24h(testing method is pressed the GB1037-1988 standard); 90 days biological decomposition of this preservative film rate 〉=60%(testing standard: GB/T 20197-2006; ISO14855:1999)
Pack the Chinese cabbage of 400g with the preservative film of the method preparation, under the condition of 10 ℃/relative humidity RH-20%, the percentage of water loss that stores after seven days is: 25.3%; The Chinese cabbage surface dry is without any withered and yellow and rotten.And without the Chinese cabbage of preservative film packing under identical condition, the percentage of water loss after seven days is 81.3%, just occurs greenery without the Chinese cabbage of preservative film packing at second day withered and yellow.
Embodiment 5(extrusion by melting)
Then the respectively metering of above each group enters homogenizer and mixes 20 minutes, and (each section heated for controlling temperature scope of twin screw extruder sleeve and die head is respectively: a district: 160 ℃ at 160-180 ℃ by twin screw extruder in discharging; Two districts: 165 ℃; Three districts: 170 ℃; Four districts: 175 ℃, five districts: 180 ℃; Six districts: 180 ℃; Get to know: 170 ℃) extruding pelletization.Then through forcing machine 160-180 ℃ of (extruder temperature of blown film divides four sections heated for controlling temperatures: 160 ℃, 170 ℃, 180 ℃ and 175 ℃) extrusion-blown modling film forming.
This preservative film at normal temperatures, its OTR oxygen transmission rate is: 0.0115cm
3/ m
2/ 24h/(25 ℃, relative humidity: 60%; Testing method is pressed the ASTMD3985-1995 standard); Water vapor transmittance is: 76.6gH
2O/m
2/ 24h(testing method is pressed the GB1037-1988 standard); 90 days biological decomposition of this preservative film rate 〉=60%(testing standard: GB/T 20197-2006; ISO14855:1999)
Pack the leek of 300g with the preservative film of the method preparation, under the condition of 8 ℃/relative humidity RH-30%, the percentage of water loss that stores after seven days is: 7.65%; The leek surface dry is without any withered and yellow and rotten.And without the leek of preservative film packing under identical condition, the percentage of water loss after seven days is 26.5%, just occurs greenery without the leek of preservative film packing at the 3rd day withered and yellow.
The present invention realizes preservative film to the controlled breathing of moisture content by the consumption that changes the moisturizing water-holding agent, thereby reaches the breathing of vegetables moisture content, and realizes the fresh-keeping of vegetables and guarantee the quality to be effective and obvious.
Claims (10)
1. the preparation method of a controlled breathing preservative film, it is characterized in that, first water-soluble poly-hydroxy class softening agent is dissolved in the 3-6 times of water of prescription composition gross weight, then add polyvinyl alcohol, moisture content respiratory regulation agent, moisturizing water-holding agent, increase-volume compatilizer and auxiliary agent, and be heated to 90-95 ℃ complete soluble in water, disperseed 30-60 minute, and be cooled to 50-70 ℃, prepare the solution for casting film-forming; Gained is used for the solution of casting film-forming through the steel band of die head curtain coating to the curtain coating production line, and the dry baking tunnel that passes through again 120-180 ℃ is dried to controlled breathing preservative film;
Or water-soluble poly-hydroxy class softening agent, polyvinyl alcohol, moisture content respiratory regulation agent, moisturizing water-holding agent, increase-volume compatilizer and auxiliary agent added homogenizer mix, discharging by twin screw extruder at 160-180 ℃ of extruding pelletization; Then through forcing machine 160-180 ℃ of extrusion-blown modling film forming;
By mass percentage, consisting of of reaction raw materials: polyvinyl alcohol 60-80%, water-soluble poly-hydroxy class softening agent 10-30%, moisture content respiratory regulation agent 1-5%, increase-volume compatilizer 1-3%, moisturizing water-holding agent 3-10%, auxiliary agent 0.5-3%;
Described water-soluble poly-hydroxy class softening agent is water-soluble polyol or the water-soluble poly-hydroxy class material that contains the above nontoxic free from extraneous odour of two hydroxyls or two hydroxyls;
Described moisture content respiratory regulation agent is water-soluble or the dispersible nonionic surface active agent of water, has characteristic hydrophilic, that do not absorb water in physical environment;
Described increase-volume compatilizer refers to the nonionogenic tenside of hydrophile-lipophile balance value 〉=9;
Described auxiliary agent is one or more in superfine talcum powder, ultra-fine precipitates method white carbon black, aerosil, micronized polyethylene wax and the superfine polypropylene wax powder;
Described moisturizing water-holding agent is Zulkovsky starch, gelatin, treated starch ether or modified cellulose ethers.
2. preparation method according to claim 1, it is characterized in that: the polymerization degree of described polyvinyl alcohol is that 500-2400, alcoholysis degree are 80%-99%.
3. preparation method according to claim 2, it is characterized in that: described polyvinyl alcohol is one or more in polyvinyl alcohol 0588, polyvinyl alcohol 0580, polyvinyl alcohol 1788, polyvinyl alcohol 2088, polyvinyl alcohol 2288, polyvinyl alcohol 2488 and polyvinyl alcohol 1799, polyvinyl alcohol 2099, polyvinyl alcohol 2299 and the polyvinyl alcohol 2499.
4. preparation method according to claim 1, it is characterized in that: described water-soluble poly-hydroxy class softening agent is one or more in glycerol, polyoxyethylene glycol-200, PEG-4000, PEG-6000, Polyethylene glycol-2000, PEG-4000 and PEG-6000 0, sorbyl alcohol and the TriMethylolPropane(TMP).
5. preparation method according to claim 1, it is characterized in that: described moisture content respiratory regulation agent is Tripolyglycerol monostearates, six Polyglycerine monostearates, ten Polyglycerine, six stearates, the trimerization glyceryl monooleate, the trimerization glyceryl monolaurate, propylene glycol monostearate, propylene glycol mono-oleate, Rikemal PL 100, glyceryl monolaurate, glyceryl monostearate, the Stearinsaeure double glyceride, monoolein, the polyoxyethylene dioleate, the TEG monoleate, the polyoxypropylene stearate, the anhydrous sorbitol laurate, the polyoxyethylene oxypropylene oleic acid ester, polyoxypropylene N.F,USP MANNITOL dioleate, polyoxyethylene wool alcohol ether or polyoxyethylene fatty acid.
6. preparation method according to claim 1, it is characterized in that: described increase-volume compatilizer is Vinlub 73, polyoxyethylene laurel ether, polyoxyethylene 20 sorbitan monolaurate, the polyoxyethylene cholesterol ethers, polyoxypropylene wool alcohol ether, polyoxyethylene 20 sorbitan monolaurate, polyoxyethylene 20 sorbitan monostearate, polyoxyethylene wool alcohol ether, polyoxyethylene 20 sorbitan monooleate, the polyoxyethylene glycol monopalmitate, polyoxyl 40 stearate, Vinlub 73 or polyoxyethylene 20 sorbitan monolaurate.
7. preparation method according to claim 1 is characterized in that: by percentage to the quality, the solid content of described solution for casting film-forming is 15-25%.
8. preparation method according to claim 7 is characterized in that: by percentage to the quality, the solid content of described solution the best for casting film-forming is 20%.
9. preparation method according to claim 7, it is characterized in that: the time that homogenizer mixes is 15-30 minute.
10. controlled breathing preservative film is characterized in that: it is by the described method preparation of claim 1.
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| CN105585803A (en) * | 2015-12-25 | 2016-05-18 | 佛山市博维环保材料有限公司 | Breathable fresh-keeping film with degrading capability and preparation method of breathable fresh-keeping film |
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| CN107459752A (en) * | 2017-10-11 | 2017-12-12 | 广东省生物工程研究所（广州甘蔗糖业研究所） | A kind of environment-friendly water-soluble polyvinyl alcohol packing film and preparation method thereof |
| CN107746470A (en) * | 2017-10-27 | 2018-03-02 | 常德金德新材料科技股份有限公司 | Anti-mildew fresh-keeping film and preparation method thereof |
| CN107814967A (en) * | 2017-11-06 | 2018-03-20 | 常德金德新材料科技股份有限公司 | Anti-mildew fresh-keeping film and preparation method thereof |
| CN108822381A (en) * | 2018-06-12 | 2018-11-16 | 芜湖蓝天工程塑胶有限公司 | Food fresh-keeping film and preparation method thereof |
| CN110452484A (en) * | 2019-09-04 | 2019-11-15 | 仲恺农业工程学院 | Modified starch/PVA (polyvinyl alcohol) fruit and vegetable preservative film with sensitivity to carbon dioxide and preparation method thereof |
| CN111363281A (en) * | 2020-03-09 | 2020-07-03 | 华南理工大学 | High-water-absorptivity sheet composite material and preparation method and application thereof |
| CN111688056A (en) * | 2020-05-20 | 2020-09-22 | 华南理工大学 | High-water-absorption film composite material and preparation method thereof |
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| CN107746470A (en) * | 2017-10-27 | 2018-03-02 | 常德金德新材料科技股份有限公司 | Anti-mildew fresh-keeping film and preparation method thereof |
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| CN108822381A (en) * | 2018-06-12 | 2018-11-16 | 芜湖蓝天工程塑胶有限公司 | Food fresh-keeping film and preparation method thereof |
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| CN111363281A (en) * | 2020-03-09 | 2020-07-03 | 华南理工大学 | High-water-absorptivity sheet composite material and preparation method and application thereof |
| CN111363281B (en) * | 2020-03-09 | 2021-05-14 | 华南理工大学 | High-water-absorptivity sheet composite material and preparation method and application thereof |
| CN111688056A (en) * | 2020-05-20 | 2020-09-22 | 华南理工大学 | High-water-absorption film composite material and preparation method thereof |
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