CN114773664A - Production method of starch modified plastic film - Google Patents
Production method of starch modified plastic film Download PDFInfo
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- CN114773664A CN114773664A CN202210580814.1A CN202210580814A CN114773664A CN 114773664 A CN114773664 A CN 114773664A CN 202210580814 A CN202210580814 A CN 202210580814A CN 114773664 A CN114773664 A CN 114773664A
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- 229920002472 Starch Polymers 0.000 title claims abstract description 39
- 235000019698 starch Nutrition 0.000 title claims abstract description 39
- 239000008107 starch Substances 0.000 title claims abstract description 39
- 239000002985 plastic film Substances 0.000 title claims abstract description 37
- 229920006255 plastic film Polymers 0.000 title claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 229920000881 Modified starch Polymers 0.000 claims abstract description 26
- 239000004368 Modified starch Substances 0.000 claims abstract description 26
- 235000019426 modified starch Nutrition 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 230000000844 anti-bacterial effect Effects 0.000 claims abstract description 19
- 239000000243 solution Substances 0.000 claims abstract description 19
- 238000003756 stirring Methods 0.000 claims abstract description 17
- 239000007800 oxidant agent Substances 0.000 claims abstract description 16
- 230000001590 oxidative effect Effects 0.000 claims abstract description 16
- 239000002002 slurry Substances 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 239000007864 aqueous solution Substances 0.000 claims abstract description 7
- 238000001914 filtration Methods 0.000 claims abstract description 6
- 230000007935 neutral effect Effects 0.000 claims abstract description 6
- 238000005086 pumping Methods 0.000 claims abstract description 6
- 230000001105 regulatory effect Effects 0.000 claims abstract description 6
- 238000005406 washing Methods 0.000 claims abstract description 6
- 239000010410 layer Substances 0.000 claims description 36
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 20
- 239000000853 adhesive Substances 0.000 claims description 14
- 230000001070 adhesive effect Effects 0.000 claims description 14
- 238000001035 drying Methods 0.000 claims description 13
- 239000004033 plastic Substances 0.000 claims description 13
- 229920003023 plastic Polymers 0.000 claims description 13
- 239000011259 mixed solution Substances 0.000 claims description 12
- 108010010803 Gelatin Proteins 0.000 claims description 10
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 10
- 239000012790 adhesive layer Substances 0.000 claims description 10
- 230000001276 controlling effect Effects 0.000 claims description 10
- 229920000159 gelatin Polymers 0.000 claims description 10
- 239000008273 gelatin Substances 0.000 claims description 10
- 235000019322 gelatine Nutrition 0.000 claims description 10
- 235000011852 gelatine desserts Nutrition 0.000 claims description 10
- 235000011187 glycerol Nutrition 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 10
- 238000005507 spraying Methods 0.000 claims description 10
- 239000002344 surface layer Substances 0.000 claims description 10
- 239000002131 composite material Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 229920005989 resin Polymers 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 6
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims description 5
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 5
- PLKATZNSTYDYJW-UHFFFAOYSA-N azane silver Chemical compound N.[Ag] PLKATZNSTYDYJW-UHFFFAOYSA-N 0.000 claims description 5
- 229920006167 biodegradable resin Polymers 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 238000005187 foaming Methods 0.000 claims description 5
- 239000008187 granular material Substances 0.000 claims description 5
- 238000009998 heat setting Methods 0.000 claims description 5
- 239000003094 microcapsule Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 229910052709 silver Inorganic materials 0.000 claims description 5
- 239000004332 silver Substances 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 5
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 4
- JQWHASGSAFIOCM-UHFFFAOYSA-M sodium periodate Chemical compound [Na+].[O-]I(=O)(=O)=O JQWHASGSAFIOCM-UHFFFAOYSA-M 0.000 claims description 4
- 238000010345 tape casting Methods 0.000 claims description 3
- 239000008188 pellet Substances 0.000 claims description 2
- 229920002635 polyurethane Polymers 0.000 claims description 2
- 239000004814 polyurethane Substances 0.000 claims description 2
- 239000012286 potassium permanganate Substances 0.000 claims description 2
- 238000007731 hot pressing Methods 0.000 claims 2
- 235000013305 food Nutrition 0.000 abstract description 20
- 238000003860 storage Methods 0.000 abstract description 4
- 230000006866 deterioration Effects 0.000 abstract description 2
- 238000004806 packaging method and process Methods 0.000 description 7
- 230000015556 catabolic process Effects 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 230000003115 biocidal effect Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/36—After-treatment
- C08J9/40—Impregnation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2266/00—Composition of foam
- B32B2266/02—Organic
- B32B2266/0214—Materials belonging to B32B27/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
- B32B2307/7145—Rot proof, resistant to bacteria, mildew, mould, fungi
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/716—Degradable
- B32B2307/7163—Biodegradable
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2300/00—Characterised by the use of unspecified polymers
- C08J2300/16—Biodegradable polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2303/00—Characterised by the use of starch, amylose or amylopectin or of their derivatives or degradation products
- C08J2303/04—Starch derivatives
- C08J2303/10—Oxidised starch
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2389/00—Characterised by the use of proteins; Derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2400/00—Characterised by the use of unspecified polymers
- C08J2400/16—Biodegradable polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2403/00—Characterised by the use of starch, amylose or amylopectin or of their derivatives or degradation products
- C08J2403/04—Starch derivatives
- C08J2403/10—Oxidised starch
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2489/00—Characterised by the use of proteins; Derivatives thereof
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Laminated Bodies (AREA)
Abstract
The invention discloses a production method of a starch modified plastic film, which specifically comprises the following steps: s1, adding starch and an oxidant into an oxidant aqueous solution according to the mass ratio of 1:0.25-1:0.4, stirring through a stirrer, adding a pH regulator, regulating the solution to be neutral, heating the solution to 35-40 ℃, stirring for 4-6 hours to form starch slurry, pumping out the starch slurry through a water pump, filtering through a filter plate, and washing with water for 3-5 times to obtain modified starch; the invention relates to the technical field of plastic films. The production method of the starch modified plastic film has good antibacterial and bactericidal effects through the added components, has good antibacterial and bactericidal effects when being used in the field of food, ensures the storage quality of the food, avoids deterioration of the food due to storage reasons, has simple integral production steps, reduces the labor intensity of workers to a certain extent, and is convenient for a user to operate.
Description
Technical Field
The invention relates to the technical field of plastic films, in particular to a production method of a starch modified plastic film.
Background
The traditional plastic film is generally a film made of polyvinyl chloride, polyethylene, polypropylene, polystyrene and other resins, is used for packaging and is used as a film coating layer, the share of plastic packages and plastic package products in the market is larger and larger, particularly, the composite plastic flexible package is widely applied to the fields of food, medicine, chemical industry and the like, wherein the proportion of the food packages is the largest, the traditional plastic film is difficult to degrade along with the gradual enhancement of the environmental protection concept, and the environmental pollution is serious, so the starch modified plastic film is gradually developed, is mainly made of starch, is easy to degrade in the environment and is widely used day by day.
Traditional starch modified plastic film, generally only starch makes through a series of complicated steps, but plastic film's application range is extensive, when using in the food field, plastic film need have certain antibiotic bactericidal effect, but the antibiotic bactericidal effect of current plastic film is not very good, has certain influence to the quality of food like this, and traditional production steps are loaded down with trivial details, staff intensity of labour is high.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a production method of a starch modified plastic film, which solves the problem that the production method of the starch modified plastic film does not have a certain antibacterial effect.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a production method of a starch modified plastic film specifically comprises the following steps:
s1, adding starch and an oxidant into an oxidant aqueous solution according to the mass ratio of 1:0.25-1:0.4, stirring by a stirrer, adding a pH regulator, regulating the solution to be neutral, heating the solution to 35-40 ℃, stirring for 4-6 hours to form starch slurry, pumping the starch slurry by a water pump, filtering by a filter plate, washing for 3-5 times by water to obtain modified starch;
s2, heating and dissolving a certain amount of gelatin, weighing a certain amount of glycerin for later use, adding the gelatin, the microcapsule and the glycerin into the modified starch solution obtained in S1 according to a certain proportion, stirring for 20-30min, cooling the mixed solution to room temperature, pouring the cooled mixed solution into a self-made mold, casting, and finally putting the self-made mold into a drying oven to dry to constant weight;
s3, adjusting the water content of the modified starch obtained in the S2 to enable the water content to be 15-30 wt%, then extruding and granulating the obtained modified starch through an extruder, selecting a proper amount of completely biodegradable resin granules for drying treatment, and then placing for later use;
s4, mixing the modified starch particles and the resin particles obtained in the step S3 in proportion, putting the mixture into a hopper of an extruder, and then carrying out physical foaming to obtain biodegradable foamed plastic;
s5, preparing a surface layer from foamed plastic, preparing an intermediate layer and an optional inner layer, bonding the surface layer and the intermediate layer, spraying an adhesive on the surface of the intermediate layer, controlling the thickness of the adhesive layer to be 0.01-0.012mm, bonding the intermediate layer and the inner layer, spraying the adhesive on the surface of the inner layer, controlling the thickness of the adhesive layer to be 0.02-0.025mm, and finally performing heat setting treatment on the bonded film on a hot-press roller device, wherein the thickness of the cooled and formed film is about 0.2-0.24 mm;
and S6, according to the silver mirror reaction principle, immersing the biodegradable foamed plastic film obtained in the step S5 into a silver ammonia solution to prepare the starch/nano silver antibacterial composite film.
Preferably, in the S1, the concentration of the oxidant aqueous solution is 0.1-0.2 g/m.
Preferably, in S1, the oxidant is any one of hydrogen peroxide, sodium periodate and potassium permanganate.
Preferably, in said S2, the obtained pellets are dried to a moisture content of not more than 3 wt%.
Preferably, in S5, the adhesive is a two-component polyurethane adhesive.
Preferably, in S5, the temperature of the hot-press roll is controlled to 50 ℃ to 55 ℃, and the surface of the hot-press roll cannot contact moisture.
(III) advantageous effects
The invention provides a production method of a starch modified plastic film. The method has the following beneficial effects: the production method of the starch modified plastic film has good antibacterial and bactericidal effects through the added components, has good antibacterial and bactericidal effects when being used in the field of food, ensures the storage quality of the food, avoids the deterioration of the food caused by storage reasons, has simple integral production steps, and reduces the labor intensity of workers to a certain extent.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides three technical schemes: a method for producing a starch modified plastic film specifically comprises the following steps:
example 1
S1, adding starch and an oxidant into an oxidant aqueous solution according to the mass ratio of 1:0.25, stirring by a stirrer, adding a pH regulator, regulating the solution to be neutral, heating the solution to 35 ℃, stirring for 4 hours to form starch slurry, pumping out the starch slurry by a water pump, filtering by a filter plate, and washing for 3 times by water to obtain modified starch;
s2, heating and dissolving a certain amount of gelatin, weighing a certain amount of glycerin for later use, adding the gelatin, the microcapsule and the glycerin into the modified starch solution obtained in S1 according to a certain proportion, stirring for 20min, cooling the mixed solution to room temperature, pouring the cooled mixed solution into a self-made mold, casting, and finally putting the self-made mold into a drying oven to dry to constant weight;
s3, adjusting the water content of the modified starch obtained in the S2 to enable the water content to be 15 wt%, then extruding and granulating the obtained modified starch through an extruder, selecting a proper amount of completely biodegradable resin granules for drying treatment, and then placing for later use;
s4, mixing the modified starch particles and the resin particles obtained in the step S3 in proportion, putting the mixture into a hopper of an extruder, and then carrying out physical foaming to obtain biodegradable foamed plastic;
s5, preparing a surface layer from foamed plastic, preparing an intermediate layer and an optional inner layer, adhering the surface layer and the intermediate layer, spraying an adhesive on the surface of the intermediate layer, controlling the thickness of the adhesive layer to be 0.01mm, adhering the intermediate layer and the inner layer, spraying the adhesive on the surface of the inner layer, controlling the thickness of the adhesive layer to be 0.02mm, and finally performing heat setting treatment on the adhered film on a hot-press roller device, wherein the thickness of the cooled and molded film is about 0.2 mm;
and S6, according to the silver mirror reaction principle, immersing the biodegradable foamed plastic film obtained in the step S5 into a silver ammonia solution to prepare the starch/nano silver antibacterial composite film.
Example 2
S1, adding starch and an oxidant into an oxidant aqueous solution according to the mass ratio of 1:0.4, stirring by a stirrer, adding a pH regulator, regulating the solution to be neutral, heating the solution to 40 ℃, stirring for 6 hours to form starch slurry, pumping out the starch slurry by a water pump, filtering by a filter plate, and washing for 5 times by water to obtain modified starch;
s2, heating and dissolving a certain amount of gelatin, weighing a certain amount of glycerin for later use, adding the gelatin, the microcapsule and the glycerin into the modified starch solution obtained in the step S1 according to a proportion, stirring for 30min, cooling the mixed solution to room temperature, pouring the cooled mixed solution into a self-made mold for tape casting, and finally drying the mixed solution in a drying oven to constant weight;
s3, adjusting the water content of the modified starch obtained in the S2 to ensure that the water content is 30 wt%, then extruding and granulating the obtained modified starch by an extruder, selecting a proper amount of completely biodegradable resin granules for drying treatment, and then placing for later use;
s4, mixing the modified starch particles and the resin particles obtained in the step S3 in proportion, putting the mixture into a hopper of an extruder, and then carrying out physical foaming to obtain biodegradable foamed plastic;
s5, preparing a surface layer from foamed plastic, preparing an intermediate layer and an optional inner layer, adhering the surface layer and the intermediate layer, spraying an adhesive on the surface of the intermediate layer, controlling the thickness of the adhesive layer to be 0.012mm, adhering the intermediate layer and the inner layer, spraying the adhesive on the surface of the inner layer, controlling the thickness of the adhesive layer to be 0.025mm, and finally performing heat setting treatment on the adhered film on a hot-press roller device, wherein the thickness of the cooled and molded film is about 0.24 mm;
and S6, according to the silver mirror reaction principle, immersing the biodegradable foamed plastic film obtained in the step S5 into a silver ammonia solution to prepare the starch/nano silver antibacterial composite film.
Example 3
S1, adding starch and an oxidant into an oxidant aqueous solution according to the mass ratio of 1:0.3, stirring by a stirrer, adding a pH regulator, regulating the solution to be neutral, heating the solution to 37 ℃, stirring for 5 hours to form starch slurry, pumping out the starch slurry by a water pump, filtering by a filter plate, and washing for 4 times by water to obtain modified starch;
s2, heating and dissolving a certain amount of gelatin, weighing a certain amount of glycerin for later use, adding the gelatin, the microcapsule and the glycerin into the modified starch solution obtained in the step S1 according to a proportion, stirring for 25min, cooling the mixed solution to room temperature, pouring the cooled mixed solution into a self-made mold for tape casting, and finally drying the mixed solution in a drying oven to constant weight;
s3, adjusting the water content of the modified starch obtained in the S2 to enable the water content to be 20 wt%, then extruding and granulating the obtained modified starch through an extruder, selecting a proper amount of completely biodegradable resin granules to carry out drying treatment, and then placing for later use;
s4, mixing the modified starch particles and the resin particles obtained in the step S3 in proportion, putting the mixture into a hopper of an extruder, and then carrying out physical foaming to obtain biodegradable foamed plastic;
s5, preparing a surface layer from foamed plastic, preparing an intermediate layer and an optional inner layer, bonding the surface layer and the intermediate layer, spraying an adhesive on the surface of the intermediate layer, controlling the thickness of the adhesive layer to be 0.01-0.011mm, bonding the intermediate layer and the inner layer, spraying the adhesive on the surface of the inner layer, controlling the thickness of the adhesive layer to be 0.02-0.022mm, and finally performing heat setting treatment on the bonded film on a hot-press roller device, wherein the thickness of the cooled and formed film is about 0.2-0.22 mm;
and S6, according to the silver mirror reaction principle, immersing the biodegradable foamed plastic film obtained in the step S5 into a silver ammonia solution to prepare the starch/nano silver antibacterial composite film.
Experimental procedures
1. And (3) detecting degradability: and (3) respectively putting the products prepared in the three embodiments into soil with the same microorganisms for degradation, ensuring that the microorganism contents are close to each other as much as possible when the degraded soil is prepared, and then recording the degradation speed until the complete degradation is finished.
2. Tensile strength: the plastic films obtained in the three examples were subjected to tensile tests and the results were recorded in MPa.
3. And (3) antibacterial detection: selecting a common food in the market, packaging the food by the plastic film prepared in the embodiment 1, naturally placing the food after packaging 10 products, packaging the food by the plastic film prepared in the embodiment 2, naturally placing the food after packaging 10 products, finally packaging the food by the plastic film prepared in the embodiment 3, naturally placing the food after packaging 10 products, and opening the food after placing the food for a proper time to detect and record bacteria in the food.
Results of the experiment
The daily plastic films on the market are randomly selected as a control group, the degradability, the tensile strength and the antibacterial property of the plastic films are respectively detected under the same detection conditions, and the results are recorded, so that the following table shows that the product prepared in example 2 has the best effects of degradability, tensile strength and antibacterial property.
It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A production method of a starch modified plastic film is characterized by comprising the following steps: the method specifically comprises the following steps:
s1, adding starch and an oxidant into an oxidant aqueous solution according to the mass ratio of 1:0.25-1:0.4, stirring through a stirrer, adding a pH regulator, regulating the solution to be neutral, heating the solution to 35-40 ℃, stirring for 4-6 hours to form starch slurry, pumping out the starch slurry through a water pump, filtering through a filter plate, and washing with water for 3-5 times to obtain modified starch;
s2, heating and dissolving a certain amount of gelatin, weighing a certain amount of glycerin for later use, adding the gelatin, the microcapsule and the glycerin into the modified starch solution obtained in the step S1 according to a proportion, stirring for 20-30min, cooling the mixed solution to room temperature, pouring the cooled mixed solution into a self-made mold for tape casting, and finally putting the self-made mold into a drying oven for drying until the weight is constant;
s3, adjusting the water content of the modified starch obtained in the S2 to enable the water content to be 15-30 wt%, then extruding and granulating the obtained modified starch through an extruder, selecting a proper amount of completely biodegradable resin granules to carry out drying treatment, and then placing for later use;
s4, mixing the modified starch particles and the resin particles obtained in the step S3 in proportion, putting the mixture into a hopper of an extruder, and then carrying out physical foaming to obtain biodegradable foamed plastic;
s5, preparing a surface layer from foamed plastic, preparing an intermediate layer and a selected inner layer, bonding the surface layer and the intermediate layer, spraying an adhesive on the surface of the intermediate layer, controlling the thickness of the adhesive layer to be 0.01-0.012mm, bonding the intermediate layer and the inner layer, spraying the adhesive on the surface of the inner layer, controlling the thickness of the adhesive layer to be 0.02-0.025mm, and finally performing heat setting treatment on the bonded film on a hot-press roller device, wherein the thickness of the cooled and molded film is about 0.2-0.24 mm;
and S6, according to the silver mirror reaction principle, immersing the biodegradable foamed plastic film obtained in the step S5 into a silver ammonia solution to prepare the starch/nano silver antibacterial composite film.
2. The method for producing a starch-modified plastic film according to claim 1, wherein: in the S1, the concentration of the oxidant water solution is 0.1-0.2 g/m.
3. The method for producing a starch-modified plastic film according to claim 1, wherein: in the S1, the oxidant is any one of hydrogen peroxide, sodium periodate and potassium permanganate.
4. The method for producing a starch-modified plastic film according to claim 1, wherein: in said S2, the resulting pellets are dried to a moisture content of not more than 3% by weight.
5. The method for producing a starch-modified plastic film according to claim 1, wherein: in the S5, the adhesive is two-component polyurethane adhesive.
6. The method for producing a starch-modified plastic film according to claim 1, wherein: in the step S5, the temperature of the hot-pressing roller is controlled to be 50-55 ℃, and the surface of the hot-pressing roller can not contact with moisture.
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| CN107236235A (en) * | 2017-05-11 | 2017-10-10 | 山东师范大学 | A kind of method that foamed plastic is produced with modified starch |
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| US5374304A (en) * | 1989-04-29 | 1994-12-20 | Battelle-Institut E.V. | Special amyloses and their use for producing biodegradable plastics |
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| CN102552963A (en) * | 2011-11-21 | 2012-07-11 | 北京科技大学 | Preparation method of starch/nano-silver antibacterial composite film |
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