CN109233051A - It is a kind of to can be used for the fresh-keeping vinyon packaging film of lilac pears - Google Patents
It is a kind of to can be used for the fresh-keeping vinyon packaging film of lilac pears Download PDFInfo
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- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
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- 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
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Abstract
It can be used for the fresh-keeping vinyon packaging film of lilac pears the invention discloses a kind of, it is related to plastic cement technical field, is made of following component: polyvinyl resin, gel of zinc, cetearyl glucoside modification biological degradation agent, nano inorganic filler, plasticizer, acetyl tri-n-butyl citrate, heat stabilizer；Vinyon packaging film steam transit dose and oxygen transit dose prepared by the present invention are lower, fresh-keeping convenient for lilac pears, and the shelf life of lilac pears can be greatly improved.
Description
Technical field
The invention belongs to plastic cement technical fields, and in particular to a kind of to can be used for the fresh-keeping vinyon packaging of lilac pears
Film.
Background technique
Lilac pears are the kinds come out by Zhejiang Agricultural Univ with " snowflake " and " new century " for parent culture, have pulp
Pure white, delicate and crisp, slag lacks the features such as succulence, sweet, aromatic flavour, is loved by consumers, market prospects are very wide.
Existing polyethylene packaging film for lilac pears fresh-keeping packaging film in use, the shelf life of lilac pears is shorter, from
And not only result in waste of resources, cost is also greatly improved, therefore, how to improve polyethylene packaging film, improves lilac pears
Shelf life be required technical problems to be solved.
Summary of the invention
The purpose of the present invention is being directed to existing problem, providing a kind of can be used for the fresh-keeping vinyon of lilac pears
Packaging film.
The present invention is achieved by the following technical solutions:
It is a kind of to can be used for the fresh-keeping vinyon packaging film of lilac pears, it is made by weight of following component: polyethylene
Resin 75-79, gel of zinc 6.5-6.8, cetearyl glucoside modification biological degradation agent 8-10, nano inorganic filler 12-15,
Plasticizer 1.3-1.8, acetyl tri-n-butyl citrate 0.5-0.7, heat stabilizer 0.3-0.5.
Further, the gel of zinc the preparation method comprises the following steps:
(1) zinc sulfate, coagulant and polyalcohol are uniformly mixed by 3:7:12 mass ratio, with the stirring of 500r/min revolving speed
Then 10min flows back 3.2 hours at 75 DEG C again, obtains mixed liquor；
(2) mixed liquor obtained above is heated to 56 DEG C, 2min is then handled under 500W ultrasonic wave, then is mixed to treated
The fluorination reagent for adding its quality 6.5% in liquid is closed, in the case where 80 DEG C of water-baths are kept the temperature, with 800r/min revolving speed stirring 3 hours, is obtained
Lyosol；The fluorination reagent is the ammonium fluoride aqueous solution that mass fraction is 20%；
(3) lyosol is stood at 115 DEG C aging 10 hours, obtains gel of zinc.
Further, the polyalcohol is 1, and 3-propanediol and glycerine are mixed to get by 3:1 mass ratio.
Further, the coagulant is polyvinylpyrrolidone.
Further, the cetearyl glucoside modification biological degradation agent the preparation method comprises the following steps:
(1) polyvinyl alcohol-polyethyleneglycol-graft copolymer, aliphatic polyester-polyethyleneglycol block copolymer are pressed into 35-
The ratio of 38g:42-44g:380-390ml is added in methylene chloride, is heated to 70 DEG C, small with the stirring 2 of 320r/min revolving speed
When, obtain mixed solution；
(2) be added in the mixed solution configured to step (1) its quality 0.12% Coconut Fatty Acid Monoethanolamide, 1.38% the third two
Alcohol fatty acid ester and 10% deionized water, then with 1500r/min revolving speed stirring 2 hours, then using ultrasonic treatment 2.5min,
Obtain lotion；
(3) lotion obtained above is heated to 86 DEG C, added into lotion its quality 0.35% stearmide and 1.5% it is secondary
Alcohol is subsequently cooled to 5 DEG C with 1500r/min revolving speed stirring 2 hours, stands 40min, and the methylene chloride in recycling lotion obtains
To mixed liquor, mixed liquor is centrifuged, obtains solids, solids is cleaned, drying to constant weight, obtains biology
Degradation agent；
(4) cetearyl glucoside is evenly spread in deionized water, is configured to the cetearyl alcohol that mass fraction is 8.5%
Base glucoside solution, adjusting cetearyl glucoside pH value of solution range is 5.5, and it is molten then to add cetearyl glucoside again
The organo silane coupling agent of liquid quality 1.2%, after mixing evenly, then the step of adding cetearyl glucoside solution quality 35%
(3) then the biodegradation agent obtained was centrifuged with 120r/min revolving speed stirring 2 hours, wash, and drying to constant weight,
Up to cetearyl glucoside modification biological degradation agent.
Further, the polyvinyl alcohol-polyethyleneglycol-graft copolymer is by 70% polyvinyl alcohol units and 30%
Polyethyleneglycol member composition.
Further, the aliphatic polyester-polyethyleneglycol block copolymer is two block copolymerization of polyester-polyethylene glycol
Object, aliphatic polyester is polycaprolactone in the aliphatic polyester-polyethyleneglycol block copolymer, and block copolymer amount is
8.56 ten thousand, wherein polyethylene glycol block molecule amount is 5500, and aliphatic polyester block molecule amount is 38000.
Further, the ultrasonic frequency of the ultrasonic treatment is 45kHz, power 900W.
Further, the inorganic filler is nanometer calcium carbonate.
Further, the plasticizer is tributyl citrate, and the heat stabilizer is calcium stearate.
The present invention has the advantage that the cetearyl glucoside modification biological added in the present invention compared with prior art
Degradation polarity and hydrophily are significantly reduced, and make the degradation of cetearyl glucoside modification biological and polyvinyl resin molecule
Interface compatibility is improved；Compared with pure polyethylene packaging film, 35% left side is can be improved in the tensile strength of packaging film of the present invention
It is right；For vinyon packaging film prepared by the present invention at 162 DEG C or less without thermal decomposition, phase transformation enthalpy may be up to 135.8J/g, because
The thermal stability of vinyon packaging film of the present invention is greatly improved.
After the present invention is analyzed by the architectural characteristic to polyvinyl resin, by adding a certain amount of cetearyl
Glucoside modification biological degradation agent, can significantly improve the connection structure between polyvinyl resin molecule and other components, thus
The melt processable that material system can be improved to a certain extent can be improved the physical and mechanical property of manufactured packaging film, and
And, additionally it is possible to there is good degradability, degradation speed is fast, and palliating degradation degree is high, can change by cetearyl glucoside
Dispersion of the property biodegradation agent in system, to cetearyl glucoside modification biological under extraneous soil environment comprehensive function
The destruction of chemical bond in degradation agent, polyvinyl resin molecule and calcium carbonate, to reach the whole degradation effect to packaging film
Fruit；It, can using packaging film of the invention since cetearyl glucoside modification biological degradation agent also has certain water-retaining property
Do not allow the food waste of entire packaging film receiving perishable, it is smelly.Simultaneously as it is modified to increase cetearyl glucoside
Biodegradation agent makes packaging film more flexible, non-breakable.Made by addition cetearyl glucoside modification biological degradation agent
It is easy degradation for raw material, avoids and pollutes the environment, degradable packaging film of the invention has excellent film forming, protects
Aqueous, water imbibition and tensile strength is big, flexibility is good；The phase compared with using packaging film made of single polyvinyl resin
Than tensile strength is high, soaking effect is good, is positively retained at longer weight bearing situations；There is better biological degradability simultaneously, it is low
Carbocyclic ring is protected；Vinyon packaging film steam transit dose and oxygen transit dose prepared by the present invention are lower, fresh-keeping convenient for lilac pears,
The shelf life of lilac pears can be greatly improved.
Specific embodiment
Embodiment 1
It is a kind of to can be used for the fresh-keeping vinyon packaging film of lilac pears, it is made by weight of following component: polyethylene
Resin 75, gel of zinc 6.5, cetearyl glucoside modification biological degradation agent 8, nano inorganic filler 12, plasticizer 1.3, second
Acyl tri-n-butyl citrate 0.5, heat stabilizer 0.3.
Further, the gel of zinc the preparation method comprises the following steps:
(1) zinc sulfate, coagulant and polyalcohol are uniformly mixed by 3:7:12 mass ratio, with the stirring of 500r/min revolving speed
Then 10min flows back 3.2 hours at 75 DEG C again, obtains mixed liquor；
(2) mixed liquor obtained above is heated to 56 DEG C, 2min is then handled under 500W ultrasonic wave, then is mixed to treated
The fluorination reagent for adding its quality 6.5% in liquid is closed, in the case where 80 DEG C of water-baths are kept the temperature, with 800r/min revolving speed stirring 3 hours, is obtained
Lyosol；The fluorination reagent is the ammonium fluoride aqueous solution that mass fraction is 20%；
(3) lyosol is stood at 115 DEG C aging 10 hours, obtains gel of zinc.
Further, the polyalcohol is 1, and 3-propanediol and glycerine are mixed to get by 3:1 mass ratio.
Further, the coagulant is polyvinylpyrrolidone.
Further, the cetearyl glucoside modification biological degradation agent the preparation method comprises the following steps:
(1) polyvinyl alcohol-polyethyleneglycol-graft copolymer, aliphatic polyester-polyethyleneglycol block copolymer are pressed into 35g:
The ratio of 42g:380ml is added in methylene chloride, is heated to 70 DEG C, with 320r/min revolving speed stirring 2 hours, obtains mixing molten
Liquid；
(2) be added in the mixed solution configured to step (1) its quality 0.12% Coconut Fatty Acid Monoethanolamide, 1.38% the third two
Alcohol fatty acid ester and 10% deionized water, then with 1500r/min revolving speed stirring 2 hours, then using ultrasonic treatment 2.5min,
Obtain lotion；
(3) lotion obtained above is heated to 86 DEG C, added into lotion its quality 0.35% stearmide and 1.5% it is secondary
Alcohol is subsequently cooled to 5 DEG C with 1500r/min revolving speed stirring 2 hours, stands 40min, and the methylene chloride in recycling lotion obtains
To mixed liquor, mixed liquor is centrifuged, obtains solids, solids is cleaned, drying to constant weight, obtains biology
Degradation agent；
(4) cetearyl glucoside is evenly spread in deionized water, is configured to the cetearyl alcohol that mass fraction is 8.5%
Base glucoside solution, adjusting cetearyl glucoside pH value of solution range is 5.5, and it is molten then to add cetearyl glucoside again
The organo silane coupling agent of liquid quality 1.2%, after mixing evenly, then the step of adding cetearyl glucoside solution quality 35%
(3) then the biodegradation agent obtained was centrifuged with 120r/min revolving speed stirring 2 hours, wash, and drying to constant weight,
Up to cetearyl glucoside modification biological degradation agent.
Further, the polyvinyl alcohol-polyethyleneglycol-graft copolymer is by 70% polyvinyl alcohol units and 30%
Polyethyleneglycol member composition.
Further, the aliphatic polyester-polyethyleneglycol block copolymer is two block copolymerization of polyester-polyethylene glycol
Object, aliphatic polyester is polycaprolactone in the aliphatic polyester-polyethyleneglycol block copolymer, and block copolymer amount is
8.56 ten thousand, wherein polyethylene glycol block molecule amount is 5500, and aliphatic polyester block molecule amount is 38000.
Further, the ultrasonic frequency of the ultrasonic treatment is 45kHz, power 900W.
Further, the inorganic filler is nanometer calcium carbonate.
Further, the plasticizer is tributyl citrate, and the heat stabilizer is calcium stearate.
Embodiment 2
It is a kind of to can be used for the fresh-keeping vinyon packaging film of lilac pears, it is made by weight of following component: polyethylene
Resin 79, gel of zinc 6.8, cetearyl glucoside modification biological degradation agent 10, nano inorganic filler 15, plasticizer 1.8, second
Acyl tri-n-butyl citrate 0.7, heat stabilizer 0.5.
Further, the gel of zinc the preparation method comprises the following steps:
(1) zinc sulfate, coagulant and polyalcohol are uniformly mixed by 3:7:12 mass ratio, with the stirring of 500r/min revolving speed
Then 10min flows back 3.2 hours at 75 DEG C again, obtains mixed liquor；
(2) mixed liquor obtained above is heated to 56 DEG C, 2min is then handled under 500W ultrasonic wave, then is mixed to treated
The fluorination reagent for adding its quality 6.5% in liquid is closed, in the case where 80 DEG C of water-baths are kept the temperature, with 800r/min revolving speed stirring 3 hours, is obtained
Lyosol；The fluorination reagent is the ammonium fluoride aqueous solution that mass fraction is 20%；
(3) lyosol is stood at 115 DEG C aging 10 hours, obtains gel of zinc.
Further, the polyalcohol is 1, and 3-propanediol and glycerine are mixed to get by 3:1 mass ratio.
Further, the coagulant is polyvinylpyrrolidone.
Further, the cetearyl glucoside modification biological degradation agent the preparation method comprises the following steps:
(1) polyvinyl alcohol-polyethyleneglycol-graft copolymer, aliphatic polyester-polyethyleneglycol block copolymer are pressed into 38g:
The ratio of 44g:390ml is added in methylene chloride, is heated to 70 DEG C, with 320r/min revolving speed stirring 2 hours, is mixed
Solution；
(2) be added in the mixed solution configured to step (1) its quality 0.12% Coconut Fatty Acid Monoethanolamide, 1.38% the third two
Alcohol fatty acid ester and 10% deionized water, then with 1500r/min revolving speed stirring 2 hours, then using ultrasonic treatment 2.5min,
Obtain lotion；
(3) lotion obtained above is heated to 86 DEG C, added into lotion its quality 0.35% stearmide and 1.5% it is secondary
Alcohol is subsequently cooled to 5 DEG C with 1500r/min revolving speed stirring 2 hours, stands 40min, and the methylene chloride in recycling lotion obtains
To mixed liquor, mixed liquor is centrifuged, obtains solids, solids is cleaned, drying to constant weight, obtains biology
Degradation agent；
(4) cetearyl glucoside is evenly spread in deionized water, is configured to the cetearyl alcohol that mass fraction is 8.5%
Base glucoside solution, adjusting cetearyl glucoside pH value of solution range is 5.5, and it is molten then to add cetearyl glucoside again
The organo silane coupling agent of liquid quality 1.2%, after mixing evenly, then the step of adding cetearyl glucoside solution quality 35%
(3) then the biodegradation agent obtained was centrifuged with 120r/min revolving speed stirring 2 hours, wash, and drying to constant weight,
Up to cetearyl glucoside modification biological degradation agent.
Further, the polyvinyl alcohol-polyethyleneglycol-graft copolymer is by 70% polyvinyl alcohol units and 30%
Polyethyleneglycol member composition.
Further, the aliphatic polyester-polyethyleneglycol block copolymer is two block copolymerization of polyester-polyethylene glycol
Object, aliphatic polyester is polycaprolactone in the aliphatic polyester-polyethyleneglycol block copolymer, and block copolymer amount is
8.56 ten thousand, wherein polyethylene glycol block molecule amount is 5500, and aliphatic polyester block molecule amount is 38000.
Further, the ultrasonic frequency of the ultrasonic treatment is 45kHz, power 900W.
Further, the inorganic filler is nanometer calcium carbonate.
Further, the plasticizer is tributyl citrate, and the heat stabilizer is calcium stearate.
Embodiment 3
It is a kind of to can be used for the fresh-keeping vinyon packaging film of lilac pears, it is made by weight of following component: polyethylene
Resin 78, gel of zinc 6.6, cetearyl glucoside modification biological degradation agent 9, nano inorganic filler 13, plasticizer 1.5, second
Acyl tri-n-butyl citrate 0.6, heat stabilizer 0.4.
Further, the gel of zinc the preparation method comprises the following steps:
(1) zinc sulfate, coagulant and polyalcohol are uniformly mixed by 3:7:12 mass ratio, with the stirring of 500r/min revolving speed
Then 10min flows back 3.2 hours at 75 DEG C again, obtains mixed liquor；
(2) mixed liquor obtained above is heated to 56 DEG C, 2min is then handled under 500W ultrasonic wave, then is mixed to treated
The fluorination reagent for adding its quality 6.5% in liquid is closed, in the case where 80 DEG C of water-baths are kept the temperature, with 800r/min revolving speed stirring 3 hours, is obtained
Lyosol；The fluorination reagent is the ammonium fluoride aqueous solution that mass fraction is 20%；
(3) lyosol is stood at 115 DEG C aging 10 hours, obtains gel of zinc.
Further, the polyalcohol is 1, and 3-propanediol and glycerine are mixed to get by 3:1 mass ratio.
Further, the coagulant is polyvinylpyrrolidone.
Further, the cetearyl glucoside modification biological degradation agent the preparation method comprises the following steps:
(1) polyvinyl alcohol-polyethyleneglycol-graft copolymer, aliphatic polyester-polyethyleneglycol block copolymer are pressed into 36g:
The ratio of 43g:386ml is added in methylene chloride, is heated to 70 DEG C, with 320r/min revolving speed stirring 2 hours, obtains mixing molten
Liquid；
(2) be added in the mixed solution configured to step (1) its quality 0.12% Coconut Fatty Acid Monoethanolamide, 1.38% the third two
Alcohol fatty acid ester and 10% deionized water, then with 1500r/min revolving speed stirring 2 hours, then using ultrasonic treatment 2.5min,
Obtain lotion；
(3) lotion obtained above is heated to 86 DEG C, added into lotion its quality 0.35% stearmide and 1.5% it is secondary
Alcohol is subsequently cooled to 5 DEG C with 1500r/min revolving speed stirring 2 hours, stands 40min, and the methylene chloride in recycling lotion obtains
To mixed liquor, mixed liquor is centrifuged, obtains solids, solids is cleaned, drying to constant weight, obtains biology
Degradation agent；
(4) cetearyl glucoside is evenly spread in deionized water, is configured to the cetearyl alcohol that mass fraction is 8.5%
Base glucoside solution, adjusting cetearyl glucoside pH value of solution range is 5.5, and it is molten then to add cetearyl glucoside again
The organo silane coupling agent of liquid quality 1.2%, after mixing evenly, then the step of adding cetearyl glucoside solution quality 35%
(3) then the biodegradation agent obtained was centrifuged with 120r/min revolving speed stirring 2 hours, wash, and drying to constant weight,
Up to cetearyl glucoside modification biological degradation agent.
Further, the polyvinyl alcohol-polyethyleneglycol-graft copolymer is by 70% polyvinyl alcohol units and 30%
Polyethyleneglycol member composition.
Further, the aliphatic polyester-polyethyleneglycol block copolymer is two block copolymerization of polyester-polyethylene glycol
Object, aliphatic polyester is polycaprolactone in the aliphatic polyester-polyethyleneglycol block copolymer, and block copolymer amount is
8.56 ten thousand, wherein polyethylene glycol block molecule amount is 5500, and aliphatic polyester block molecule amount is 38000.
Further, the ultrasonic frequency of the ultrasonic treatment is 45kHz, power 900W.
Further, the inorganic filler is nanometer calcium carbonate.
Further, the plasticizer is tributyl citrate, and the heat stabilizer is calcium stearate.
Comparative example 1: it is only that cetearyl glucoside modification biological degradation agent replaces with biological drop with the difference of embodiment 1
Solve agent.
Comparative example 2: it is only that cetearyl glucoside modification biological degradation agent replaces with aliphatic with the difference of embodiment 1
Polyester-polyethyleneglycol block copolymer.
Comparative example 3: it is only that cetearyl glucoside modification biological degradation agent replaces with polyethylene with the difference of embodiment 1
Alcohol-polyethyleneglycol-graft copolymer.
Comparative example 4: gel of zinc is not added.
Control group: application number: 201510938155.4.
Embodiment is used to the vinyon packaging film of identical processing technology processing procedure same size, every group of matter with comparative example
Amount is 12g, and being placed on temperature be 15 ± 5 DEG C, in the environment of relative air humidity is 70 ± 5%, is uniformly mixed with 380g soil, native
Earth physicochemical property is identical, places 2 months, then cleaned, and dries, and weighs, and calculates mass loss rate:
Table 1
As can be seen from Table 1, plastic packaging film prepared by the present invention has good degradability.
Performance test
The embodiment of the present invention and comparative example are made 0.06mm thickness thin film using same process and are tested for the property:
Gas permeability is using porometer (CFP-1500-AEL of PMI Co., LTD manufacture) measurement, and by convention, gas permeability is used
Gurley number (Gurley number) indicates, but since Gurley number cannot reflect the effect of film thickness, therefore, it is difficult to obtain film
Relative permeability under the influence of porous structure, in order to avoid this disadvantage, present invention employs darcy permeabilities.Darcy infiltration
Constant is calculated by following equatioies, and nitrogen, C=(8FTV)/(π D are used in the present invention2(P2-1))
Wherein C indicates that darcy permeability, F indicate that flow velocity, T indicate that thickness of sample, V indicate gas viscosity (nitrogen 0.185),
D indicates sample diameter, and P indicates pressure；
Average value of the darcy permeability within the scope of 100~200psi is used in the present invention；
Table 2
As can be seen from Table 2, vinyon packaging film steam transit dose and oxygen transit dose prepared by the present invention are lower, are convenient for
Food fresh keeping；
Continue to test, at 10 DEG C, the film of above-mentioned preparation is packed the lilac pears of equivalent by relative air humidity 60% respectively,
Compare each group shelf life time:
Table 3
As can be seen from Table 3, the shelf life of lilac pears can be greatly improved in vinyon packaging film prepared by the present invention.
Claims (10)
1. a kind of can be used for the fresh-keeping vinyon packaging film of lilac pears, which is characterized in that by weight by below at
Divide and be made: polyvinyl resin 75-79, gel of zinc 6.5-6.8, cetearyl glucoside modification biological degradation agent 8-10, nanometer
Inorganic filler 12-15, plasticizer 1.3-1.8, acetyl tri-n-butyl citrate 0.5-0.7, heat stabilizer 0.3-0.5.
A kind of it can be used for the fresh-keeping vinyon packaging film of lilac pears 2. according to claim 1, which is characterized in that
The gel of zinc the preparation method comprises the following steps:
(1) zinc sulfate, coagulant and polyalcohol are uniformly mixed by 3:7:12 mass ratio, with the stirring of 500r/min revolving speed
Then 10min flows back 3.2 hours at 75 DEG C again, obtains mixed liquor；
(2) mixed liquor obtained above is heated to 56 DEG C, 2min is then handled under 500W ultrasonic wave, then is mixed to treated
The fluorination reagent for adding its quality 6.5% in liquid is closed, in the case where 80 DEG C of water-baths are kept the temperature, with 800r/min revolving speed stirring 3 hours, is obtained
Lyosol；The fluorination reagent is the ammonium fluoride aqueous solution that mass fraction is 20%；
(3) lyosol is stood at 115 DEG C aging 10 hours, obtains gel of zinc.
A kind of it can be used for the fresh-keeping vinyon packaging film of lilac pears 3. according to claim 1, which is characterized in that
The polyalcohol is 1, and 3-propanediol and glycerine are mixed to get by 3:1 mass ratio.
A kind of it can be used for the fresh-keeping vinyon packaging film of lilac pears 4. according to claim 1, which is characterized in that
The coagulant is polyvinylpyrrolidone.
A kind of it can be used for the fresh-keeping vinyon packaging film of lilac pears 5. according to claim 1, which is characterized in that
The cetearyl glucoside modification biological degradation agent the preparation method comprises the following steps:
(1) polyvinyl alcohol-polyethyleneglycol-graft copolymer, aliphatic polyester-polyethyleneglycol block copolymer are pressed into 35-
The ratio of 38g:42-44g:380-390ml is added in methylene chloride, is heated to 70 DEG C, small with the stirring 2 of 320r/min revolving speed
When, obtain mixed solution；
(2) be added in the mixed solution configured to step (1) its quality 0.12% Coconut Fatty Acid Monoethanolamide, 1.38% the third two
Alcohol fatty acid ester and 10% deionized water, then with 1500r/min revolving speed stirring 2 hours, then using ultrasonic treatment 2.5min,
Obtain lotion；
(3) lotion obtained above is heated to 86 DEG C, added into lotion its quality 0.35% stearmide and 1.5% it is secondary
Alcohol is subsequently cooled to 5 DEG C with 1500r/min revolving speed stirring 2 hours, stands 40min, and the methylene chloride in recycling lotion obtains
To mixed liquor, mixed liquor is centrifuged, obtains solids, solids is cleaned, drying to constant weight, obtains biology
Degradation agent；
(4) cetearyl glucoside is evenly spread in deionized water, is configured to the cetearyl alcohol that mass fraction is 8.5%
Base glucoside solution, adjusting cetearyl glucoside pH value of solution range is 5.5, and it is molten then to add cetearyl glucoside again
The organo silane coupling agent of liquid quality 1.2%, after mixing evenly, then the step of adding cetearyl glucoside solution quality 35%
(3) then the biodegradation agent obtained was centrifuged with 120r/min revolving speed stirring 2 hours, wash, and drying to constant weight,
Up to cetearyl glucoside modification biological degradation agent.
A kind of it can be used for the fresh-keeping vinyon packaging film of lilac pears 6. according to claim 5, which is characterized in that
The polyvinyl alcohol-polyethyleneglycol-graft copolymer is made of 70% polyvinyl alcohol units and 30% polyethyleneglycol member.
A kind of it can be used for the fresh-keeping vinyon packaging film of lilac pears 7. according to claim 5, which is characterized in that
Aliphatic polyester-the polyethyleneglycol block copolymer is polyester-polyethylene glycol di-block copolymer, the aliphatic polyester-
Aliphatic polyester is polycaprolactone in polyethyleneglycol block copolymer, and block copolymer amount is 8.56 ten thousand, wherein poly- second two
Alcohol block molecule amount is 5500, and aliphatic polyester block molecule amount is 38000.
A kind of it can be used for the fresh-keeping vinyon packaging film of lilac pears 8. according to claim 5, which is characterized in that
The ultrasonic frequency of the ultrasonic treatment is 45kHz, power 900W.
A kind of it can be used for the fresh-keeping vinyon packaging film of lilac pears 9. according to claim 1, which is characterized in that
The inorganic filler is nanometer calcium carbonate.
10. it is according to claim 1 it is a kind of can be used for the fresh-keeping vinyon packaging film of lilac pears, feature exists
In the plasticizer is tributyl citrate, and the heat stabilizer is calcium stearate.
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