CN114805944A - Environment-friendly, energy-saving and emission-reducing green pollution-free packaging bag and preparation process - Google Patents
Environment-friendly, energy-saving and emission-reducing green pollution-free packaging bag and preparation process Download PDFInfo
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- 238000004806 packaging method and process Methods 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims abstract description 104
- 229920001592 potato starch Polymers 0.000 claims abstract description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 235000011187 glycerol Nutrition 0.000 claims abstract description 35
- 229920002472 Starch Polymers 0.000 claims abstract description 33
- 239000008107 starch Substances 0.000 claims abstract description 33
- 235000019698 starch Nutrition 0.000 claims abstract description 33
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims abstract description 30
- 235000010413 sodium alginate Nutrition 0.000 claims abstract description 30
- 239000000661 sodium alginate Substances 0.000 claims abstract description 30
- 229940005550 sodium alginate Drugs 0.000 claims abstract description 30
- 238000009210 therapy by ultrasound Methods 0.000 claims abstract description 13
- 239000011521 glass Substances 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 15
- 238000001035 drying Methods 0.000 claims description 12
- 238000002474 experimental method Methods 0.000 claims description 9
- 238000004321 preservation Methods 0.000 claims description 8
- 238000005303 weighing Methods 0.000 claims description 8
- 239000010425 asbestos Substances 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 239000012153 distilled water Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 229910052895 riebeckite Inorganic materials 0.000 claims description 4
- 230000007613 environmental effect Effects 0.000 claims description 2
- 239000004698 Polyethylene Substances 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 239000005022 packaging material Substances 0.000 abstract description 3
- -1 polyethylene Polymers 0.000 abstract description 3
- 229920000573 polyethylene Polymers 0.000 abstract description 3
- 238000002834 transmittance Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 9
- 230000035699 permeability Effects 0.000 description 6
- 235000002595 Solanum tuberosum Nutrition 0.000 description 4
- 244000061456 Solanum tuberosum Species 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 230000003993 interaction Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
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- 238000011160 research Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 235000012015 potatoes Nutrition 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229920000856 Amylose Polymers 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 239000006057 Non-nutritive feed additive Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
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- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229920006238 degradable plastic Polymers 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008863 intramolecular interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 239000013081 microcrystal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012785 packaging film Substances 0.000 description 1
- 229920006280 packaging film Polymers 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
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Classifications
-
- 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
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/46—Applications of disintegrable, dissolvable or edible materials
- B65D65/466—Bio- or photodegradable packaging materials
-
- 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
- C08J2303/02—Starch; Degradation products thereof, e.g. dextrin
-
- 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
- C08J2405/00—Characterised by the use of polysaccharides or of their derivatives not provided for in groups C08J2401/00 or C08J2403/00
- C08J2405/04—Alginic acid; Derivatives thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/05—Alcohols; Metal alcoholates
- C08K5/053—Polyhydroxylic alcohols
Abstract
The invention discloses an environment-friendly energy-saving emission-reducing green pollution-free packaging bag and a preparation process, wherein the performance of a potato starch film can be obviously improved by gelatinizing potato starch, keeping the temperature at 85 ℃ for 20min, carrying out ultrasonic crushing treatment for 45min, adding glycerol and sodium alginate into a treated potato starch solution, and the formula of the ultrasonic treatment modified potato starch film is as follows: the concentration of potato starch is 9.0g/100mL, the addition amount of glycerin is 5.0g/100mL, the addition amount of sodium alginate is 0.6g/100mL, the tensile strength of the prepared starch film reaches 72.187N,the water vapor transmission rate is 20.197 mg/(cm) 2 D) CO2 transmittance of 1.226 mg/(cm) 2 D), the formed film is uniform and stable, is light yellow, has high transparency, is suitable for partially replacing polyethylene packaging materials, is mainly used for preparing packaging bags by the film, has lower cost, can be naturally degraded in the environment in a short time, cannot cause pollution to the environment, and is very worthy of popularization.
Description
Technical Field
The invention relates to the technical field of packaging bags, in particular to an environment-friendly, energy-saving and emission-reducing green pollution-free packaging bag.
Background
The rapid development of social economy leads people to pay more and more attention to food safety and environmental safety, natural, simple and low-carbon is an active life style of human beings and is widely accepted by the public, the main material for packaging at present is a petroleum-based non-degradable plastic film, the using amount is large, serious white pollution is caused, and plasticizers and various processing aids are added into the packaging films in the production process, so that the packaged goods are threatened.
The high-intensity ultrasound can destroy hydrogen bonds in starch molecules to present a dissolved state, so that the starch molecules have the film forming property similar to amylose.
The potato starch is used as a main raw material, the film forming conditions and the starch film formula of the ultrasonic composite modified potato starch film are researched, the influence of different additives on the film performance is discussed, and the research work has certain theoretical and practical significance on the development and application of degradable film materials in China, so that the invention is necessary for inventing the environment-friendly, energy-saving, emission-reducing, green and pollution-free packaging bag which takes the potato starch as the main raw material.
SUMMARY OF THE PATENT FOR INVENTION
The invention aims to provide an environment-friendly, energy-saving and emission-reducing green pollution-free packaging bag, and in order to achieve the purpose, the invention provides the following technical scheme: the environment-friendly, energy-saving and emission-reducing green and pollution-free packaging bag comprises the following components in percentage by mass: 4-15% of potato starch, 1-8% of glycerol, 0.1-1% of sodium alginate and the balance of water.
Preferably, the environment-friendly, energy-saving and emission-reducing green pollution-free packaging bag comprises the following components in parts by weight: 9 parts of potato starch, 5 parts of glycerol, 0.6 part of sodium alginate and the balance of water.
A preparation process of an environment-friendly, energy-saving and emission-reducing green pollution-free packaging bag comprises the following steps:
(1) preparing a potato starch pasting liquid: weighing 30g of potato starch, adding into 270mL of distilled water, putting into a constant-temperature water bath kettle, continuously stirring until the starch is completely gelatinized, and keeping the temperature for a certain time;
(2) ultrasonic treatment of gelatinized starch: placing the gelatinized starch in an ultrasonic crusher, carrying out ultrasonic crushing treatment for a certain time, and continuously stirring to ensure uniform ultrasonic treatment;
(3) drying at constant temperature to form a film: putting the potato starch film-forming solution subjected to water bath into a constant-temperature water bath, adding glycerol and sodium alginate, keeping the temperature for a certain time, stirring in a constant-temperature magnetic stirrer, ventilating for 10min under the vacuum condition of 0.1MPa, accurately weighing 140mL of fixed volume each time, uniformly pouring into an organic glass plate groove with the specification of 20cm multiplied by 1cm (length multiplied by width multiplied by height) (the weighed mass and the size of the plate groove can be determined according to the thickness and the performance of a required film), putting into a constant-temperature incubator, drying, keeping the constant time, and taking out;
(4) uncovering the film: placing the dried organic glass plate on an asbestos net to prevent the experiment table from being damaged by overhigh temperature, quickly separating the periphery of the film from the glass plate by using a blade, quickly uncovering the film after cooling for 5min, separating the film from the periphery of the glass plate when uncovering the film, and balancing for 48h to perform index determination under the condition that the relative humidity is 50%.
(5) Bag making: and (4) producing the qualified products into films in batches, and making the films into finished packaging bags by using a bag making machine.
Preferably, the temperature of the constant-temperature water bath in the step (1) is 85 ℃, and the heat preservation time is 20 min.
Preferably, the power of the ultrasonic crusher in the step (2) is 20kHz, and the ultrasonic crushing treatment time is 45 min.
Preferably, the temperature of the constant-temperature water bath in the step (3) is 85 ℃, and the heat preservation time is 20 min.
Preferably, the stirring time of the constant-temperature magnetic stirrer in the step (3) is 30min, and the temperature is controlled at 85 ℃.
Preferably, the drying temperature of the constant temperature incubator in the step (3) is controlled at 90 ℃, and the holding time is 7 h.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, through the gelatinization treatment of potato starch, the heat preservation at 85 ℃ is carried out for 20min, the ultrasonic crushing treatment is carried out for 45min, the glycerol and sodium alginate components are added into the treated potato starch solution, the performance of the potato starch film can be obviously improved, and the formula of the ultrasonic treatment modified potato starch film is as follows: the starch concentration of potato is 9.0g/100mL, the addition amount of glycerol is 5.0g/100mL, the addition amount of sodium alginate is 0.6g/100mL, the tensile strength of the prepared starch film reaches 72.187N, and the water vapor transmission rate is 20.197 mg/(cm) 2 D) CO2 transmittance of 1.226 mg/(cm) 2 D), the formed film is uniform and stable, is light yellow, has high transparency, is suitable for partially replacing polyethylene packaging materials, is mainly used for preparing packaging bags by the film, has lower cost, can be naturally degraded in the environment in a short time, cannot cause pollution to the environment, and is very worthy of popularization.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a graph showing the effect of potato starch concentration on film performance in accordance with the present invention;
FIG. 2 is a graph showing the effect of glycerol content on membrane performance in accordance with the present invention;
FIG. 3 is a diagram showing the influence of the sodium alginate content on the membrane performance in the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments in the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person skilled in the art based on the embodiments in the patent of the invention without any inventive work belong to the protection scope of the patent of the invention.
The environment-friendly, energy-saving and emission-reducing green pollution-free packaging bag comprises the following components in percentage by mass: 4-15% of potato starch, 1-8% of glycerol, 0.1-1% of sodium alginate and the balance of water; the environment-friendly, energy-saving and emission-reducing green pollution-free packaging bag comprises the following components in parts by weight: 9 parts of potato starch, 5 parts of glycerol, 0.6 part of sodium alginate and the balance of water, and the preparation process comprises the following steps:
(1) preparing a potato starch pasting liquid: weighing 30g of potato starch, adding into 270mL of distilled water, putting into a constant-temperature water bath kettle, continuously stirring until the starch is completely gelatinized, and keeping the temperature for a certain time;
(2) ultrasonic treatment of gelatinized starch: placing the gelatinized starch in an ultrasonic crusher, carrying out ultrasonic crushing treatment for a certain time, and continuously stirring to ensure uniform ultrasonic treatment;
(3) drying at constant temperature to form a film: putting the potato starch film-forming solution subjected to water bath into a constant-temperature water bath, adding glycerol and sodium alginate, keeping the temperature for a certain time, stirring in a constant-temperature magnetic stirrer, ventilating for 10min under the vacuum condition of 0.1MPa, accurately weighing 140mL of fixed volume each time, uniformly pouring into an organic glass plate groove with the specification of 20cm multiplied by 1cm (length multiplied by width multiplied by height) (the weighed mass and the size of the plate groove can be determined according to the thickness and the performance of a required film), putting into a constant-temperature incubator, drying, keeping the constant time, and taking out;
(4) uncovering the film: placing the dried organic glass plate on an asbestos net to prevent the experiment table from being damaged by overhigh temperature, quickly separating the periphery of the film from the glass plate by using a blade, quickly uncovering the film after cooling for 5min, separating the film from the periphery of the glass plate when uncovering the film, and balancing for 48h to perform index determination under the condition that the relative humidity is 50%.
(5) Bag making: and (4) producing the qualified products into films in batches, and making the films into finished packaging bags by using a bag making machine.
The first embodiment is as follows:
the environment-friendly, energy-saving and emission-reducing green pollution-free packaging bag comprises the following components in percentage by mass: 4-15% of potato starch, 1-8% of glycerol, 0.1-1% of sodium alginate and the balance of water; the environment-friendly, energy-saving and emission-reducing green pollution-free packaging bag comprises the following components in parts by weight: 9 parts of potato starch, 5 parts of glycerol, 0.6 part of sodium alginate and the balance of water, and the preparation process comprises the following steps:
(1) preparing a potato starch pasting liquid: weighing 30g of potato starch, adding into 270mL of distilled water, putting into a constant-temperature water bath kettle, continuously stirring until the starch is completely gelatinized, and keeping the temperature for a certain time;
(2) ultrasonic treatment of gelatinized starch: placing the gelatinized starch in an ultrasonic crusher, carrying out ultrasonic crushing treatment for a certain time, and continuously stirring to ensure uniform ultrasonic treatment;
(3) drying at constant temperature to form a film: putting the potato starch film-forming solution subjected to water bath into a constant-temperature water bath, adding glycerol and sodium alginate, keeping the temperature for a certain time, stirring in a constant-temperature magnetic stirrer, ventilating for 10min under the vacuum condition of 0.1MPa, accurately weighing 140mL of fixed volume each time, uniformly pouring into an organic glass plate groove with the specification of 20cm multiplied by 1cm (length multiplied by width multiplied by height) (the weighed mass and the size of the plate groove can be determined according to the thickness and the performance of a required film), putting into a constant-temperature incubator, drying, keeping the constant time, and taking out;
(4) uncovering the film: placing the dried organic glass plate on an asbestos net to prevent the experiment table from being damaged by overhigh temperature, quickly separating the periphery of the film from the glass plate by using a blade, quickly uncovering the film after cooling for 5min, separating the film from the periphery of the glass plate when uncovering the film, and balancing for 48h to perform index determination under the condition that the relative humidity is 50%.
(5) Bag making: and (4) producing the qualified products into films in batches, and making the films into finished packaging bags by using a bag making machine.
In the step (1), the temperature of the constant-temperature water bath is 85 ℃, and the heat preservation time is 20 min.
In the step (2), the power of the ultrasonic crusher is 20kHz, and the ultrasonic crushing treatment time is 45 min.
And (4) in the step (3), the temperature of the constant-temperature water bath is 85 ℃, and the heat preservation time is 20 min.
And (4) in the step (3), the stirring time of the constant-temperature magnetic stirrer is 30min, and the temperature is controlled to be 85 ℃.
And (4) controlling the drying temperature of the constant-temperature incubator in the step (3) to be 90 ℃ and keeping the drying temperature for 7 hours.
According to the invention, through the gelatinization treatment of potato starch, the heat preservation at 85 ℃ is carried out for 20min, the ultrasonic crushing treatment is carried out for 45min, the glycerol and sodium alginate components are added into the treated potato starch solution, the performance of the potato starch film can be obviously improved, and the formula of the ultrasonic treatment modified potato starch film is as follows: the concentration of potato starch is 9.0g/100mL, the addition amount of glycerol is 5.0g/100mL, the addition amount of sodium alginate is 0.6g/100mL, the tensile strength of the prepared starch film reaches 72.187N, and the water vapor transmission rate is 20.197 mg/(cm) 2 D) CO2 transmittance of 1.226 mg/(cm) 2 D), the formed film is uniform and stable, is light yellow, has high transparency, is suitable for partially replacing polyethylene packaging materials, is mainly used for preparing packaging bags by the film, has lower cost, can be naturally degraded in the environment in a short time, cannot cause pollution to the environment, and is very worthy of popularization.
Example two:
effect of Potato starch Mass concentration on film Performance
Accurately preparing potato starch solution with mass concentrations of 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, 11.0 and 12.0g/100mL in sequence, after pasting and ultrasonic treatment, respectively adding 5.0g/100mL of glycerol and 0.5g/100mL of sodium alginate, and the rest operations are the same as the process flow and the operation key points, wherein the experimental result of main performance indexes is shown in figure 1, and the result shows that: when the mass concentration of the potatoes is below 6.0g/100mL, the film is extremely thin and crisp, only small flaky fragments can be formed, and the film is not easy to form; when the concentration is more than 10.0g/100mL, the potato starch has poor solubility after ultrasonic treatment, large undissolved lumps exist, the formed film is crisp, and the analysis reason can be that the starch concentration is too high, the intermolecular force of the starch is strong, the ultrasonic action is incomplete, the hydrogen bonds in the starch cannot be damaged, and the formed film is hard; the film is easy to uncover when the film forming mass concentration is 6.0-9.0 g/100mL, a soft film with a smooth surface can be obtained, in the concentration range, the interaction force among starch molecules is increased along with the increase of the potato starch concentration, the formed space network structure is compact when the film is formed, the tensile strength of the film is increased, the water permeability and the CO2 permeability are reduced, when the potato starch mass concentration is 9.0g/100mL, the various performances of the film are optimal, various factors are comprehensively considered, and the potato concentration of 9.0g/100mL is selected as the condition of a subsequent single-factor experiment.
Example three:
effect of plasticizer Glycerol on film Performance
In order to improve the forming and processing performance of the degradable film, some small molecular materials are generally required to be added as plasticizers, the mechanism of the plasticization is that the free volume of a system is increased, so that the mobility of chain segments is increased to cause Tg to be reduced, thereby improving the performance of the degradable film, glycerol can reduce the brittleness and fragility of the film by reducing the intramolecular interaction between adjacent polymer chains, increase the gaps between film matrixes and endow the film with certain flexibility, the experiment selects 6 groups of schemes of 1.0, 2.0, 3.0, 4.0, 5.0 and 6.0g/100mL respectively for experiment, the concentration of potato starch is fixed at 9g/100mL, the concentration of sodium alginate is fixed at 0.5g/100mL, other procedures are the same, and the performance indexes of the film are measured as shown in the figure 2, and the result shows that: after the glycerol is added, the plasticizing effect of the glycerol changes the structure of the starch film, compared with an unplasticized starch film, the glycerol plasticizing film is more transparent, uniform, smooth and soft, the interaction force among starch molecules is weakened along with the increase of the glycerol content, the compactness of the film is reduced, the chain mobility is enhanced, when the glycerol is subjected to external force stretching effect, the tensile strength (N) is reduced, the moisture absorption effect of the glycerol is gradually enhanced when the glycerol content is increased, the absorbed water destroys the hydrogen bonds among the starch glycerol, the interaction between the starch and water and the glycerol and the water is enhanced, the film swells, the trafficability of water molecules is enhanced, meanwhile, the CO2 permeability is enhanced because the compactness of the film is reduced, and in addition, the increase of the glycerol content can lead to the improvement of the mobility of molecular chains, and is beneficial to the formation of microcrystals; when the content of the glycerol is too small, the flexibility of the film is poor, and the brittleness and the fragility are increased, so that the addition amount of the glycerol selected in the research is 5.0g/100mL by combining the experimental results.
Example four:
effect of sodium alginate on the Performance of the added Membrane
The experiment takes the sodium alginate as a reinforcing component of the starch film, improves the defects of the starch film in the aspects of mechanical property, water resistance and the like, selects the sodium alginate addition amounts of 0.5, 0.6, 0.7, 0.8 and 0.9G/100mL respectively for the experiment, fixes the starch concentration of potatoes at 9G/100mL, fixes the glycerol content at 5G/100mL, has the same other processes, and determines the performance indexes of the film as shown in figure 3, and the result shows that: after the sodium alginate is added, the tensile strength of the potato starch film is increased, the water permeability and the air permeability are reduced, the comprehensive performance of the film is improved, the sodium alginate is added into the starch, a reticular interpenetrating structure is formed due to the strong hydrogen bond association effect between the sodium alginate and the starch molecules, the framework of the film is enhanced by good compatibility, the support becomes firmer due to the formed synergistic effect, the tensile strength of the film is greatly improved, the permeability of the film is also reduced, the gap between the frameworks is filled by the addition of the sodium alginate, but when the amount of the sodium alginate is too much, the framework becomes stronger, the softness is reduced, the film is hard and fragile, and the addition amount of the sodium alginate selected in the research is 0.6g/100 mL.
Although embodiments of the present patent 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 present patent, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides an environmental protection, energy saving and emission reduction green pollution-free wrapping bag which characterized in that: the environment-friendly, energy-saving and emission-reducing green pollution-free packaging bag comprises the following components in percentage by mass: 4-15% of potato starch, 1-8% of glycerol, 0.1-1% of sodium alginate and the balance of water.
2. The environment-friendly, energy-saving and emission-reducing green and pollution-free packaging bag according to claim 1, characterized in that: the environment-friendly, energy-saving and emission-reducing green pollution-free packaging bag comprises the following components in parts by weight: 9 parts of potato starch, 5 parts of glycerol, 0.6 part of sodium alginate and the balance of water.
3. The preparation process of the environment-friendly, energy-saving and emission-reducing green and pollution-free packaging bag according to any one of claims 1-2, characterized by comprising the following steps: the preparation process comprises the following steps:
(1) preparing a potato starch pasting liquid: weighing 30g of potato starch, adding into 270mL of distilled water, putting into a constant-temperature water bath kettle, continuously stirring until the starch is completely gelatinized, and keeping the temperature for a certain time;
(2) ultrasonic treatment of gelatinized starch: placing the gelatinized starch in an ultrasonic crusher, carrying out ultrasonic crushing treatment for a certain time, and continuously stirring to ensure uniform ultrasonic treatment;
(3) drying at constant temperature to form a film: putting the potato starch film-forming solution subjected to water bath into a constant-temperature water bath, adding glycerol and sodium alginate, keeping the temperature for a certain time, stirring in a constant-temperature magnetic stirrer, ventilating for 10min under the vacuum condition of 0.1MPa, accurately weighing 140mL of fixed volume each time, uniformly pouring into an organic glass plate groove with the specification of 20cm multiplied by 1cm (length multiplied by width multiplied by height) (the weighed mass and the size of the plate groove can be determined according to the thickness and the performance of a required film), putting into a constant-temperature incubator, drying, keeping the constant time, and taking out;
(4) uncovering the film: placing the dried organic glass plate on an asbestos net to prevent the experiment table from being damaged by overhigh temperature, quickly separating the periphery of the film from the glass plate by using a blade, quickly uncovering the film after cooling for 5min, separating the film from the periphery of the glass plate when uncovering the film, and balancing for 48h to perform index determination under the condition that the relative humidity is 50%.
(5) Bag making: and (4) producing the qualified products into films in batches, and making the films into finished packaging bags by using a bag making machine.
4. The preparation process of the environment-friendly, energy-saving and emission-reducing green and pollution-free packaging bag according to claim 3, characterized in that: the temperature of the constant-temperature water bath in the step (1) is 85 ℃, and the heat preservation time is 20 min.
5. The preparation process of the environment-friendly, energy-saving and emission-reducing green and pollution-free packaging bag according to claim 3, characterized in that: the power of the ultrasonic crusher in the step (2) is 20kHz, and the ultrasonic crushing treatment time is 45 min.
6. The preparation process of the environment-friendly, energy-saving and emission-reducing green and pollution-free packaging bag according to claim 3, characterized in that: and (4) in the step (3), the temperature of the medium constant temperature water bath is 85 ℃, and the heat preservation time is 20 min.
7. The preparation process of the environment-friendly, energy-saving and emission-reducing green and pollution-free packaging bag according to claim 3, characterized in that: and (4) stirring time of the constant-temperature magnetic stirrer in the step (3) is 30min, and the temperature is controlled at 85 ℃.
8. The preparation process of the environment-friendly, energy-saving and emission-reducing green and pollution-free packaging bag according to claim 3, characterized in that: and (4) controlling the drying temperature of the constant-temperature incubator in the step (3) to be 90 ℃, wherein the holding time is 7 h.
Priority Applications (1)
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| CN117264287A (en) * | 2023-10-16 | 2023-12-22 | 广东新天丽控股有限公司 | Composite film for packaging prefabricated vegetables and preparation method thereof |
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