CN103554553B - A kind of Starch rice based, biodegradable packing film and preparation method thereof - Google Patents
A kind of Starch rice based, biodegradable packing film and preparation method thereof Download PDFInfo
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- CN103554553B CN103554553B CN201310511057.3A CN201310511057A CN103554553B CN 103554553 B CN103554553 B CN 103554553B CN 201310511057 A CN201310511057 A CN 201310511057A CN 103554553 B CN103554553 B CN 103554553B
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- starch rice
- packing film
- biodegradable packing
- starch
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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
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
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- Wrappers (AREA)
- Biological Depolymerization Polymers (AREA)
- Cereal-Derived Products (AREA)
Abstract
A kind of Starch rice based, biodegradable packing film and preparation method thereof, this Starch rice based, biodegradable packing film is made up of the raw material of following weight percent: Starch rice 15-55%, α-amylase 0.01-0.1%, chitosan 5-15%, Sodium Benzoate 2-10%, potassium sorbate 2-10%, propionic anhydride 2-10%, polyvinyl alcohol 10-55%, linking agent 0.01-0.05%, softening agent and distilled water 15-30%.The present invention also comprises the preparation method of described Starch rice based, biodegradable packing film.The Starch rice base packing film of the present invention, biocidal property is comparatively strong, and water tolerance, resistance to acids and bases are good, and intensity is higher, can be become carbonic acid gas and water after discarded by the microbial decomposition in environment.
Description
Technical field
The present invention relates to a kind of biodegradable packing film and preparation method thereof, especially relate to a kind of Starch rice based, biodegradable packing film and preparation method thereof.
Background technology
At present, packing film mainly polyethylene or the polyvinyl chloride plastic film that in daily life, people use, these plastic films, owing to being difficult to be decomposed by soil microorganisms and absorbed by root system of plant, after life-time service, a large amount of plastics film abandons in the environment, causes detrimentally affect to environment.And these polyethylene or polyvinyl chloride plastic film are without bacteriostasis, the food adopting this film to pack is difficult to long-time preservation, carrys out hidden danger to food securing band.All the time, people are made the life better by different ways the performance of plastic film for wrapping, but all fundamentally can not solve the biodegradable sex chromosome mosaicism of plastics film.On the other hand, in the rice course of processing, inevitably produce a large amount of joint and crack rice, these joints are cracked rice containing abundant starch, and at present due to the restriction of technology, these save the starch of cracking rice and are not fully utilized, and cause the waste of resource.
Summary of the invention
The technical problem to be solved in the present invention is, overcomes the deficiencies in the prior art, provide a kind of can the Starch rice based, biodegradable packing film and preparation method thereof of microbial decomposition.
The technical scheme that the present invention solves the employing of its technical problem is:
A kind of Starch rice based, biodegradable packing film, be made up of the raw material of following weight percent: the preferred 20-35% of Starch rice 15-55%(, more preferably 25-30%), the preferred 0.03-0.06% of α-amylase 0.01-0.1%(, preferred enzyme vigor 40000-60000U/g), the preferred 7-11% of chitosan 5-15%(, more preferably 8-10%), the preferred 4-6% of Sodium Benzoate 2-10%(), the preferred 2.5-4.0% of potassium sorbate 2-10%(), the preferred 5-6% of propionic anhydride 2-10%(), the preferred 12-27% of polyvinyl alcohol (PVA) 10-55%(, more preferably 17-22%), the preferred 0.02-0.04% of linking agent 0.01-0.05%(), the preferred 1-2% of softening agent 0.8-10%() and the preferred 20-25% of distilled water 15-30%().
Described chitosan, Sodium Benzoate and potassium sorbate are antibacterial substance.
Described linking agent can be oxalic dialdehyde, the aldehydes such as mda, glutaraldehyde.
Described softening agent preferably glycerine, ethylene glycol or polyoxyethylene glycol etc.
The preparation method of the Starch rice based, biodegradable packing film of the present invention, comprises the following steps:
(1) α-amylase liquid is prepared: be split into two halves by prepared distilled water, add α-amylase in a distilled water wherein, stir, obtain α-amylase liquid;
(2) step (1) gained α-amylase liquid is joined in reactor, be preheating to 48-56 DEG C, Starch rice added in reactor, stir, while add Starch rice; Then reactor is placed in the thermostat container of 48-56 DEG C, insulation enzymolysis 4-6h, when Starch rice glue can stir, reactor is placed in boiling water bath, outer bath continues in heat-processed, Starch rice glue is thinning further, until during reactant core temperature 93-98 DEG C in reaction vessel, stop water-bath, now Starch rice is become the water-sol by enzymolyzing alpha-amylase, then adds propionic anhydride, at 60-70 DEG C of esterification 40-50min, then in mixing solutions, add chitosan, Sodium Benzoate, potassium sorbate, softening agent, mix to obtain Starch rice base;
(3) preparation of PVA glue: by second half water boil of step (1) gained, boiling water is added in PVA, and in boiling water bath, continue heated and boiled be dissolved into clear solution to PVA, obtain PVA glue;
(4) by PVA glue impouring step (2) gained Starch rice glue, linking agent is added after a direction stirring is mixed, at 50-60 DEG C of constant temperature crosslinking reaction 1.5-2.5h, after reaction terminates after 160 eye mesh screens filter, filtrate is incubated 50-60 DEG C again, vacuum defoamation 40-50min in Debubbling tank, obtain Starch rice base/PVA glue, pressurize 0.15-0.35MPa again in Debubbling tank, by the preheating tube of Starch rice base/PVA glue through 90-94 DEG C, volume pump, spray lip, be uniformly coated on and be heated to 98-102 DEG C in advance with on the casting machine steel band of the speed movement of 4-6m/min, glue film on steel band is dry by the drying tunnel being warming up to 116-124 DEG C, take off film, obtain Starch rice based, biodegradable packing film.
Further, at Starch rice based, biodegradable packing film surface even application one deck polylactic acid membrane again of drying, poly(lactic acid) consumption is the 1-3% of the raw material of described Starch rice based, biodegradable packing film, i.e. the obtained Starch rice based, biodegradable packing film improved further.
The Starch rice base packing film of the present invention, biocidal property is comparatively strong, and water tolerance, resistance to acids and bases are good, and intensity is higher, can be become carbonic acid gas and water after discarded by the microbial decomposition in environment.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail.
Embodiment 1
The Starch rice based, biodegradable packing film of the present embodiment, be made up of the raw material of following weight percent: Starch rice 35%, α-amylase 0.03%, chitosan 10%, Sodium Benzoate 4%, potassium sorbate 2.95%, propionic anhydride 6%, polyvinyl alcohol (PVA) 20%, glutaraldehyde 0.02%, ethylene glycol 2%, distilled water 20%, raw material amounts to 1Kg.
The preparation method of the Starch rice based, biodegradable packing film of the present embodiment, comprises the following steps:
(1) α-amylase liquid is prepared: prepared 200ml distilled water is divided into two parts, every part of 100ml, adds 0.3g α-amylase in 100ml distilled water wherein, stir, obtain α-amylase liquid; Another part for subsequent use;
(2) step (1) gained α-amylase liquid is added in beaker, be preheating to 52 DEG C and be placed in 52 DEG C of thermostat water baths, stir, while add Starch rice; Then the beaker that mixture is housed is placed in 52 DEG C of thermostat water baths, insulation enzymolysis 5h, when Starch rice glue can stir, beaker is placed in boiling water bath, outer bath continues in heat-processed, Starch rice glue is thinning further, until when the reactant core temperature in beaker reaches 95 DEG C, stop water-bath, now Starch rice is made the water-sol by enzymolyzing alpha-amylase, then adds propionic anhydride, at 65 DEG C of esterification 45min, then add chitosan, Sodium Benzoate, potassium sorbate and softening agent ethylene glycol to mixing solutions, mix to obtain Starch rice base;
(3) preparation of PVA glue: by step (1) gained another part of 100ml water boil, boiling water is added in PVA, and in boiling water bath, continue heated and boiled be dissolved into clear solution to PVA, obtain PVA glue;
(4) by PVA glue impouring step (2) gained Starch rice glue, linking agent glutaraldehyde is added after a direction stirring is mixed, at 55 DEG C of constant temperature crosslinking reaction 2h, after reaction terminates after 160 eye mesh screens filter, filtrate is incubated 55 DEG C again, vacuum defoamation 45min in Debubbling tank, obtain Starch rice base/PVA glue, pressurize 0.25MPa again in tank, by the preheating tube of Starch rice base/PVA glue through 92 DEG C, volume pump, spray lip, be uniformly coated on be heated in advance 100 DEG C with the speed movement of 5m/min casting machine steel band on, glue film on steel band is dry by the drying tunnel being warming up to 118 DEG C, take off film, one deck polylactic acid membrane is coated with again at the surface uniform of drying, the 2%(that use poly(lactic acid) amount is preservative film raw material is Starch rice base/PVA glue film surface deposited one deck polylactic acid membrane more after the drying), i.e. obtained Starch rice based, biodegradable packing film.
Embodiment 2
The Starch rice based, biodegradable packing film of the present embodiment, be made up of the raw material of following weight percent: 40% Starch rice, 0.06% α-amylase, 8% chitosan, 4.9% Sodium Benzoate, the potassium sorbate of 4%, the propionic anhydride of 5%, the PVA of 17%, 0.04% mda, the glycerine of 1%, the distilled water of 20%.The preparation method of the Starch rice based, biodegradable packing film of the present embodiment is identical with embodiment 1.
Embodiment 3
The Starch rice based, biodegradable packing film of the present embodiment, be made up of the raw material of following weight percent: 30% Starch rice, 0.06% α-amylase, 8% chitosan, 5.9% Sodium Benzoate, the potassium sorbate of 3%, the propionic anhydride of 5%, the PVA of 22%, 0.04% oxalic dialdehyde, the polyoxyethylene glycol of 1%, the distilled water of 25%.The preparation method of the Starch rice based, biodegradable packing film of the present embodiment is identical with embodiment 1.
Embodiment 4 Starch rice based, biodegradable packing film performance evaluation
1, physical properties
The packing film that embodiment 1 is obtained, through physical property Instrument measuring, its tensile strength 25-30MPa, elongation 100%, tensile strength and elongation measure according to GB/T13022-91 " stretched plastic film method for testing performance ", according to the data of testing tensile strength and the elongation at break obtained, can calculate the Young's modulus of film, result is 100MPa; In actual physics nature examination, elongation at break represents the toughness of film, in pH<3 or pH>11 solution, soak 15h for a long time, still can keep stronger toughness, i.e. elongation 100%.
2, bacteriostasis
The cultivation of 2.1 bacterial classification mother liquors
The present embodiment selects streptococcus aureus, intestinal bacteria and subtilis to make antibacterial experiment.In an aseptic environment, the to be measured bacterium of picking one ring after slant culture rejuvenation is in the 150mL ordinary nutritional broth culture through prior sterilizing, and for inoculation after 37 DEG C of shaking culture 24h, this i.e. bacterial classification mother liquor.
2.2 bacteriostasis property analyses
33.3g nutrient agar being dissolved in 1000mL steams in the water of shop, and regulate pH to 7.2, boil 10min, cooled pH value is that namely 7.2 ± 0.2,115 DEG C of sterilizing 30min obtain ordinary nutrient agar substratum.
Operate with reference to QB/T2591-2003 " antibiotic plastic-Anti-microbial Performance Tests method and antibacterial effect ": get bacterial classification mother liquor, for subsequent use as initial bacterium immersion liquid to suitable concn (controlling at 0.5-1.5 by OD value) with the normal saline dilution of sterilizing, Starch rice based, biodegradable packing film is cut into the thin slice of l × lcm, after ultra violet lamp sterilizing, be dipped in 15s in initial bacterium immersion liquid, take out, in (37 ± 1)
o24h is cultivated under C, relative humidity RH>90% condition, take out the diaphragm cultivating 24h again, use 10mL physiological saline respectively, employing fully shakes up mode and repeatedly rinses diaphragm, getting ImL washing lotion is inoculated in nutrient agar (NA) mixed dull and stereotyped, in (37 ± 1)
olive bacterial count after C cultivation 36h, measures viable count by GB4789.2 " microbiological test of food hygiene-total number of bacterial colony method for measuring ".
Starch rice based, biodegradable packing film prepared by embodiment 3 to the bacteriostasis rate of streptococcus aureus, intestinal bacteria and subtilis as following table:
3, biodegradable character measures
The present embodiment measures with reference to GB GB/T19277-2003 the biodegradability of Starch rice based, biodegradable packing film, and in present method determination test material, carbon changes into the conversion percentage of the carbonic acid gas discharged.The present embodiment measures Starch rice based, biodegradable packing film biodegradable rate prepared by embodiment 1, and result shows this packing film biodegradable rate 91.7%(>80%).
Claims (9)
1. a Starch rice based, biodegradable packing film, it is characterized in that, be made up of the raw material of following weight percent: Starch rice 15-55%, α-amylase 0.01-0.1%, chitosan 5-15%, Sodium Benzoate 2-10%, potassium sorbate 2-10%, propionic anhydride 2-10%, polyvinyl alcohol 10-55%, linking agent 0.01-0.05%, softening agent 0.8-10% and distilled water 15-30%;
The preparation method of described Starch rice based, biodegradable packing film, comprises the following steps:
(1) α-amylase liquid is prepared: be split into two halves by prepared distilled water, add α-amylase in a distilled water wherein, stir, obtain α-amylase liquid;
(2) step (1) gained α-amylase liquid is joined in reactor, be preheating to 48-56 DEG C, Starch rice added in reactor, stir, while add Starch rice; Then reactor is placed in the thermostat container of 48-56 DEG C, insulation enzymolysis 4-6h, when Starch rice glue can stir, reactor is placed in boiling water bath, outer bath continues in heat-processed, Starch rice glue is thinning further, until when the reactant core temperature in reaction vessel reaches 93-98 DEG C, stop water-bath, add propionic anhydride again, at 60-70 DEG C of esterification 40-50min, then in mixing solutions, add chitosan, Sodium Benzoate, potassium sorbate, softening agent, mix to obtain Starch rice base;
(3) preparation of PVA glue: second half distilled water of step (1) gained is boiled, boiling water is added in PVA, and in boiling water bath, continue heated and boiled be dissolved into clear solution to PVA, obtain PVA glue;
(4) by PVA glue impouring step (2) gained Starch rice glue, linking agent is added after a direction stirring and evenly mixing, at 50-60 DEG C of constant temperature crosslinking reaction 1.5-2.5h, after reaction terminates after 160 eye mesh screens filter, filtrate is incubated 50-60 DEG C again, vacuum defoamation 40-50min in Debubbling tank, obtain Starch rice base/PVA glue, pressurize 0.15-0.35MPa again in Debubbling tank, by the preheating tube of Starch rice base/PVA glue through 90-94 DEG C, volume pump, spray lip, be uniformly coated on and be heated to 98-102 DEG C in advance with on the casting machine steel band of the speed movement of 4-6m/min, glue film on steel band is dry by the drying tunnel being warming up to 116-124 DEG C, take off film, obtain Starch rice based, biodegradable packing film.
2. Starch rice based, biodegradable packing film according to claim 1, it is characterized in that, be made up of the raw material of following weight percent: Starch rice 20-35%, α-amylase 0.03-0.06%, chitosan 7-11%, Sodium Benzoate 4-6%, potassium sorbate 2.5-4.0%, propionic anhydride 5-6%, polyvinyl alcohol 12-27%, linking agent 0.02-0.04%, softening agent 1-2%, distilled water 20-25%.
3. Starch rice based, biodegradable packing film according to claim 2, is characterized in that, described Starch rice is 25-30%.
4. the Starch rice based, biodegradable packing film according to Claims 2 or 3, is characterized in that, described chitosan 8-10%.
5. the Starch rice based, biodegradable packing film according to Claims 2 or 3, is characterized in that, described polyvinyl alcohol 17-22%.
6. the Starch rice based, biodegradable packing film according to claim 1 or 2 or 3, is characterized in that, described α-amylase enzyme activity 40000-60000U/g.
7. the Starch rice based, biodegradable packing film according to claim 1 or 2 or 3, is characterized in that, described linking agent be oxalic dialdehyde, mda or glutaraldehyde.
8. the Starch rice based, biodegradable packing film according to claim 1 or 2 or 3, is characterized in that, described softening agent is glycerine, ethylene glycol or polyoxyethylene glycol.
9. Starch rice based, biodegradable packing film as claimed in claim 1, it is characterized in that, in its preparation methods steps (4), after film is taken off in drying, apply one deck polylactic acid membrane at gained Starch rice based, biodegradable packing film surface uniform again, poly(lactic acid) consumption is the 1-3% of described raw material weight.
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| CN105860146A (en) * | 2016-04-29 | 2016-08-17 | 苏州市鼎立包装有限公司 | Preparation method of starch-base edible packaging film |
| CN105907008A (en) * | 2016-05-03 | 2016-08-31 | 四川农业大学 | Antibacterial plastic wrap and preparation method thereof |
| CN110302679A (en) * | 2018-03-20 | 2019-10-08 | 中国石油化工股份有限公司 | Wet film of a kind of intelligence control and its preparation method and application |
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| CN109233162B (en) * | 2018-08-27 | 2021-04-20 | 江西中聚宏新材料科技有限公司 | Environment-friendly degradable composite film for packaging and preparation method thereof |
| CN109627500A (en) * | 2018-12-18 | 2019-04-16 | 王浚杰 | A kind of anti-oxidant antibacterial fully bio-degradable novel foodstuff packaging film based on organic acid |
| CN109867819A (en) * | 2019-01-11 | 2019-06-11 | 安徽鼎正包装材料有限公司 | Polylactic acid-starch-PVA composite degradable packaging film and preparation method thereof |
| CN112280109A (en) * | 2020-11-25 | 2021-01-29 | 辽阳市晨阳编织制品有限公司 | Biodegradable plastic and preparation method thereof |
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