KR20120034404A - Degradable film for packageing of food material and its manufacturing method - Google Patents

Abstract

PURPOSE: A degradable film for food packing and a manufacturing method thereof are provided to improve antibiosis, adhesive property, and adhesive force for a nylon film and a polyurethane film. CONSTITUTION: A manufacturing method of a degradable film for food packing comprises next steps: forming polyol by polymerizing carboxylic acid and alcohol; manufacturing by reacting silver nano particle, zinc powder, zeolite powder, polyol, dicumylperoxide, and sodium powder; additionally reacting polyol, dicumylperoxide, sodium powder, calcium carbonate, and methylene bis stearamide; and mixing the complex resolvent in the polyurethanes; extrusions molding the polyurethane resin and the nylon resin in a 2 layer extruder. In the polylactic acid and the complex mixing step, the polyurethanes are added.

Description

Degradable film for packageing of food material and its manufacturing method

The present invention relates to a degradable food packaging film and a method for manufacturing the same, and more specifically, dicumyl peroxide 10? 20% by weight, sodium powder 4? 6% by weight, silver nanoparticles 20? 30% by weight, zinc powder 7? 11 weight%, zeolite powder 8? 12 wt%, calcium carbonate 0.1? 2% by weight and methylene bis stearamide or ethylene bis stearamide 9? The composite disintegrating agent prepared by mixing and reacting 11% by weight was 5? Using a polyurethane resin composition having 10% by weight of decomposable and antimicrobial properties, by condensation polymerization of carboxylic acid and alcohol to form a polyol; Preparing a complex decomposition agent by reacting the polyol, dicumyl peroxide, sodium powder, silver nanoparticles, zinc powder, zeolite powder, calcium carbonate and methylene bis stearamide or ethylene bis stearamide; Mixing the complex disintegrating agent with polyurethane; And it relates to a method for producing a degradable food packaging film comprising the step of putting the prepared polyurethane resin and nylon resin into a two-layer extruder and simultaneously molding and laminating.

Polyurethane is a general term for a polymer compound having a urethane bond (-NHCOO-) in the repeating unit of the main chain, and is a polymer composed of isocyanate, a polymer polyol constituting the soft part and a single phase polyol constituting the hard part. At this time, according to the form of the polymer polyol constituting the soft portion, polyurethane may be classified into ester, ether and caprolactam.

These polyurethanes are not only good in abrasion resistance, abrasion resistance, chemical resistance, solvent resistance, but also excellent in aging resistance and oxygen stability, and are widely used as polyurethane foams, polyurethane rubbers, adhesives, synthetic fibers, paints, and the like.

Unlike general polyurethanes, the use ratio of thermoplastic polyurethanes is gradually increasing. Thermoplastic polyurethanes have the advantage of being non-toxic and environmentally friendly and capable of thermoforming.

Recycled or incinerated methods are also used to dispose or collect polyurethane products. At this time, the incineration method has a problem of generating harmful substances, and the recycling method is not easy.

Since the polyurethane is difficult to dispose or collect, it is difficult to be used for food packaging, etc., and it is not satisfactory for breathability and moisture permeability, and has poor antimicrobial properties, as well as unsatisfactory adhesiveness with other materials.

Recently, there is an increasing demand for polyurethane having a rapid decomposition at the time of disposal and improved air permeability and moisture permeability, and various researches for producing a polyurethane having excellent antimicrobial and degradability are in progress according to the demand.

However, the film for food packaging using a polyurethane resin has a disadvantage in that the air permeability and moisture permeability are significantly reduced compared to the nylon resin film generally used as a film for food packaging due to the physical properties of the polyurethane resin itself.

Accordingly, it is an object of the present invention to provide a food packaging film that has a fast disintegration in a certain period of time at the time of disposal, and at the same time has improved breathability and moisture permeability, and has excellent antibacterial and adhesive properties.

Another object of the present invention is to provide a method for easily preparing a film for food packaging of the above object.

In order to achieve the above objects as well as other objects that can be easily expressed, the present invention relates to dicumyl peroxide 10? Based on the polyol weight prepared by condensation of carboxylic acid and diol. 20% by weight, sodium powder 4? 6% by weight, silver nanoparticles 20? 30% by weight, zinc powder 7? 11 weight%, zeolite powder 8? 12 wt%, calcium carbonate 0.1? 2% by weight and methylene bis stearamide or ethylene bis stearamide 9? The composite disintegrating agent prepared by mixing and reacting 11% by weight was 5? Using a polyurethane resin composition having 10% by weight of decomposable and antimicrobial properties, by condensation polymerization of carboxylic acid and alcohol to form a polyol; Preparing a complex decomposition agent by reacting the polyol, dicumyl peroxide, sodium powder, silver nanoparticles, zinc powder, zeolite powder, calcium carbonate and methylene bis stearamide or ethylene bis stearamide; Mixing the complex disintegrating agent with polyurethane; By introducing the prepared polyurethane resin and nylon resin into a two-layer extruder by extrusion molding and the step of laminating at the same time by manufacturing a degradable food packaging film by disassembly in a certain period of time during disposal, at the same time improved breathability and moisture permeability It was possible to obtain a food packaging film having excellent antibacterial and adhesive properties and excellent adhesive force between the polyurethane film and the nylon film.

Food packaging film according to the present invention has a fast disassembly in a certain period of time at the time of disposal, at the same time has improved breathability and moisture permeability, excellent antibacterial and adhesive properties, excellent adhesion of polyurethane film and nylon film, easy to apply effect There is.

1 and 2 are graphs showing the results of the investigation of the effect of cell growth by eluate or cytotoxicity by the material eluted from the film.

The decomposable food packaging film according to the present invention has a dicumyl peroxide 10? Relative to the polyol weight prepared by condensation polymerization of carboxylic acid and diol. 20% by weight, sodium powder 4? 6% by weight, silver nanoparticles 20? 30% by weight, zinc powder 7? 11 weight%, zeolite powder 8? 12 wt%, calcium carbonate 0.1? 2% by weight and methylene bis stearamide or ethylene bis stearamide 9? The composite disintegrating agent prepared by mixing and reacting 11% by weight was 5? The polyurethane resin and the nylon resin added by 10% by weight are introduced into a two-layer extruder, which is characterized by being extruded and laminated at the same time.

In addition, the method for producing a food packaging film according to the present invention comprises the steps of condensation polymerization of carboxylic acid and alcohol to form a polyol; Preparing a complex decomposition agent by reacting the polyol, dicumyl peroxide, sodium powder, silver nanoparticles, zinc powder, zeolite powder, calcium carbonate and methylene bis stearamide or ethylene bis stearamide; Mixing the complex disintegrating agent with polyurethane; And it is characterized in that it comprises a step of laminating at the same time by extrusion molding the prepared polyurethane resin and nylon resin into a biaxial stretching extrusion molding machine.

Dicarboxylic acids or derivatives thereof used in the preparation of the polyol in the present invention include succinic acid, glutaric acid, malonic acid, oxalic acid, adipic acid, sebacic acid, azelaic acid, nonanedicarboxylic acid and alkyl or aryl ester derivatives thereof. The alcohol may be ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol or propylene glycol, 1,4-cyclohexanediol, hexamethylene Alkylene glycol or polyalkylene glycol or 1,2-propanediol, 1,2-butanediol, 1,3-butanediol, 1,2 consisting of glycol, polyethylene glycol, triethylene glycol, neopentyl glycol and tetramethylene glycol -Pentanediol, 1,3-pentanediol, 1,4-pentanediol, 1,2-hexanediol, 1,3-hexanediol, 1,4-hexanediol, 1,5-hexanediol, 1,2- Aliphatic dihydric alcohols such as octanediol, 1,3-octanediol, 1,4-octanediol, 1,5-octanediol, 1,6-octanediol and the like can be used.

The preparation of the polyols can be made by methods commonly used in the art to which this invention pertains. For example, after the esterification reaction and the transesterification reaction at a temperature of 220 ℃ or less, the esterification or transesterification product is added to a reactor equipped with a condenser and a stirrer and a thermal stabilizer, a catalyst and other aids are added to It is prepared by condensation polymerization at a temperature of 260 ° C. or lower under high vacuum. The polyols produced are 90-115 ° C., high molecular weight polymers having a weight average molecular weight of 10,000-260,000.

Dicumyl peroxide 10 to the weight of the polyol prepared as described above 10? 20% by weight, sodium powder 4? 6% by weight, silver nanoparticles 20? 30% by weight, zinc powder 7? 11 weight%, zeolite powder 8? 12 wt%, calcium carbonate 0.1? 2% by weight and methylene bis stearamide or ethylene bis stearamide 9? 11 wt% of the mixture is reacted to prepare a composite disintegrant.

The dicumyl peroxide (DCP) is a crosslinking role and ethylene bonds by cutting the role of reducing the molecular weight over time when decomposition of polyurethane, polyol and polyol can crosslink each other, polyol and Methylene bis stearamide or ethylene bis stearamide can be crosslinked. That is, a cross-linking reaction of polyol and polyol, bis stearamide and bis stearamide, polyol and bis stearamide forms a complex decomposition agent, and uniformly disperses sodium powder, silver nanoparticles, zinc powder, zeolite powder and calcium carbonate. It may be included in the form.

In addition, when the composite disintegrating agent and the polyurethane are blended, the composite disintegrating agent is decomposed to lower the molecular weight, thereby increasing the decomposition rate of the polyurethane resin composition. That is, as the composite disintegrator decomposes, the binding force between the polyurethane molecules is weakened, and accordingly, the decomposition rate of the entire polyurethane resin composition is increased.

The dicumyl peroxide is 10? It is effective to use 20% by weight, and when the dicumyl peroxide is used at less than 10% by weight of the polyol, the decomposition ability of the polyurethane resin produced is not satisfactory, and when it exceeds 20% by weight, the poly is produced. There is a disadvantage that the physical properties of the urethane resin is lowered.

The sodium powder acts to accelerate the decomposition of the polyurethane upon decomposition of the polyurethane by ethylene bond cleavage of dicumyl peroxide, and the weight of polyol is 4? It is preferable to use 6% by weight, and when the sodium powder is used in an amount less than 4% by weight based on the weight of the polyol, the ability to promote decomposition of the polyurethane resin produced is not satisfactory, and when it exceeds 6% by weight, There is a disadvantage that the physical properties of the polyurethane resin is lowered.

In addition, the silver nanoparticles are added in order to impart antimicrobial activity to the polyurethane resin to be produced. It is effective to use 30% by weight, and when the silver nanoparticles are used at less than 20% by weight of the polyol, there is a weak disadvantage of the antimicrobial properties of the polyurethane resin produced, and when it exceeds 30% by weight There is a disadvantage that the physical properties of the polyurethane resin is lowered.

In addition, the zinc particles are added in order to impart antimicrobial activity to the polyurethane resin to be produced and to improve the freshness of the food packaged when the polyurethane resin is used for food packaging. It is effective to use 11% by weight, and when the zinc particles are used at less than 7% by weight of the polyol, the antimicrobial properties of the polyurethane resin produced are poor and the freshness of the packaged food when used for food packaging is low. There are disadvantages, and when it exceeds 11% by weight there is a disadvantage that the physical properties of the polyurethane resin produced.

In addition, the zeolite powder also gives antimicrobial activity to the polyurethane resin produced as well as zinc particles, and improves the freshness of the packaged food when the manufactured polyurethane resin is used for food packaging, and weakens the physical properties of the manufactured polyurethane. It is added to accelerate the decomposition of the urethane. In particular, polyurethane has a property of rapidly decomposing to alkali, and since zeolite is alkaline, it is effective in promoting decomposition of polyurethane. The zeolite has a weight of 8? It is preferable to use 12% by weight, and when the zeolite is used in less than 8% by weight with respect to the polyol weight, the effect of addition is insignificant, and when it exceeds 12% by weight, there is a disadvantage in that the physical properties of the polyurethane resin produced are lowered.

On the other hand, the calcium carbonate is a material that improves the blending properties of the additives in the production of the composite decomposition agent and is used as a photodecomposition promoting material to promote the degradability by light such as ultraviolet rays, 0.1 to the weight of the polyol It is preferable to use 2% by weight, and when calcium carbonate is used in an amount less than 0.1% by weight based on the weight of polyol, the effect of addition is insignificant. There is this.

In addition, the methylene bis stearamide or ethylene bis stearamide is added to improve the decomposition rate of the polyurethane resin, it is 9? It is preferable to use 11% by weight, and when the methylene bis stearamide or ethylene bis stearamide is used at less than 9% by weight of the polyol, the effect of addition is slight, and when the amount exceeds 11% by weight, the polyurethane produced There is a disadvantage that the physical properties of the resin is lowered.

Among the components used in the preparation of the composite disintegrant, particles having a diameter of 10? It is preferably 100 nm, and the particles can be easily disposed in the voids of the polyurethane because the particle diameter of the components is smaller than the voids of the polyurethane. Therefore, even if moisture is impregnated in the voids of the polyurethane, the antimicrobial properties of the polyurethane resin may be improved by the components for imparting antimicrobial properties.

Complex decomposers were dicumylperoxide 10? 20% by weight, sodium powder 4? 6% by weight, silver nanoparticles 20? 30% by weight, zinc powder 7? 11 weight%, zeolite powder 8? 12 wt%, calcium carbonate 0.1? 2% by weight and methylene bis stearamide or ethylene bis stearamide 9? 11 wt% was added to the reactor and mixed; Prepared by reacting for 20 minutes at a temperature of 180 ℃.

The composite disintegrant prepared as described above is mixed with the polyurethanes commonly used in the technical field to which the present invention belongs, but the weight of the polyurethane is 5? 10 wt% of the mixture was added to the reactor, Reaction for 20 minutes at a temperature of 180 ℃ to prepare a polyurethane resin having degradability and antibacterial according to the present invention.

 When the composite disintegrator is used in less than 5% by weight based on the polyurethane weight, the resolution of the polyurethane resin may be lowered, and when it exceeds 10% by weight, the physical properties of the polyurethane resin may deteriorate rapidly.

On the other hand, polylactic acid may be further added in the step of reacting the complex decomposition agent and the polyurethane.

The polylactic acid (poly (lactic acid)) improves the degradability of the polyurethane resin. That is, polylactic acid maintains its strength for about 6 months and is completely decomposed after about 1 year, so it can be used as a substitute for polyurethane resin, and has a high hardness and a working temperature of about 160 ° C to about 210 ° C, so that it is biodegradable. It is enough to use.

The polyurethane resin composition according to the present invention can be applied to various products according to the extrusion or injection molding method. That is, the polyurethane resin composition according to the present invention can be applied to agricultural, industrial or textile products such as horticulture as well as food packaging materials.

In particular, the polyurethane resin prepared by using the polyurethane resin composition according to the present invention is improved in degradability and antimicrobial properties by the complex disintegrating agent, as well as having excellent moisture permeability and breathability as well as high resolution when used for food packaging The freshness of foods can be maintained and antimicrobial properties can be imparted.

However, the food packaging film using the polyurethane resin has a disadvantage in that the air permeability and moisture permeability is significantly reduced compared to the nylon resin film that is generally used as a food packaging film due to the physical properties of the polyurethane resin itself is prepared in the present invention The film made of polyurethane resin and the film made of nylon resin are laminated and manufactured for food packaging, so that the degradability is slightly lower than that of the film made of pure polyurethane resin prepared in the present invention, but the moisture permeability, breathability and oxygen barrier It was able to improve the freshness and shelf life of the food to be stored is improved more excellent.

Nylon used for the film made of nylon resin in the above can be used both nylon resin for the production of food packaging film commonly used in the art to which the present invention belongs, polyurethane resin film and nylon resin film has a thickness of 1 : 2 ? The ratio can be adjusted to 2: 1.

At this time, the polyurethane resin film is used as the inner layer, the nylon resin film is used as the outer layer.

On the other hand, the polyurethane resin film as the inner layer, the nylon resin film may be a multilayer film by laminating a poly (lactic acid) resin film in the polyurethane resin film in the film laminated to the outer layer.

That is, nylon resin as the outer layer, polyurethane resin as the middle layer, and polylactic acid resin as the inner layer may be added to a three-layer extruder to be extruded and laminated at the same time to produce a multilayer film.

As the polyurethane resin and the nylon resin are bonded well without using a resin having an adhesive function, the polylactic acid resin is also bonded well with the polyurethane resin, so that the multilayer film can be easily manufactured.

The reason why the polylactic acid resin is bonded to the inner layer is that when the food packaging paper is made of nylon resin and polyurethane resin, the film produced is soft, but when nylon, polyurethane, and polylactic acid resin are laminated in multiple layers, This is because it has excellent touch and can be used as a low-temperature shrink film.

The vacuum shrink films currently used are plastic materials added to PVC resin to shrink at low temperatures in order to shrink at low temperatures, but because they are vinyl chloride resins, they can have a significant impact on the environment. It is not easy to apply to food packaging.

Therefore, in the present invention, the melting point of the polylactic acid is 60 ℃, the processable temperature is 170 ~ 180 ℃, because of the shrinkage phenomenon of about 40 to 50% or more at low temperatures due to the characteristics of the resin, polylactic acid was used, Due to the low temperature shrinkage of the taxic acid, the same effect as that of the PVC shrinkage by about 30 to 40% or more at low temperatures can be obtained.

In order to easily give low-temperature shrinkage characteristics, when the total thickness of the film to be manufactured is 100%, the total thickness of the nylon resin film is 25 to 35%, the polyurethane resin film is 25 to 35% and the total thickness of the polylactic acid resin film is 40. ~ 50% was the most effective.

The following examples illustrate the invention in more detail, but do not limit the scope of the invention.

Example  One ? 3 and Comparative example  One ? 3

Adipic acid and 1,4-butanediol were introduced into the reactor at a molar ratio of 1: 1, followed by esterification and transesterification at a temperature of 220 ° C. or lower, followed by esterification or transesterification in a reactor equipped with a condenser and a stirrer. A reaction product was charged and polycondensation reaction was carried out at a temperature of 260 ° C. or less under high vacuum of 1 mmHg or less.

15% by weight of dicumyl peroxide, 5% by weight of sodium powder, 25% by weight of silver nanoparticles, 9% by weight of zinc powder, 10% by weight of zeolite powder, 1% by weight of calcium carbonate and 10% by weight of methylene bis stearamide % Is added to the reactor, mixed, and reacted at a temperature of 150 ° C. for 20 minutes to prepare a complex decomposition agent.

To the weight of the polyester-based urethane (purchased from SK Chemicals) having a number average molecular weight of 78,000, a weight average molecular weight of 164,000, and a melting point of about 170 ° C., the complex decomposition agent was added and mixed at a ratio shown in Table 1 below. The mixture was melted at a temperature of 20 ° C. for 20 minutes, and fed to an L / D 30 extruder equipped with a hopper dry, and extruded to obtain a polyurethane resin in the form of a film.

Tensile strength, elongation rate, and tear strength of the prepared film were measured ten times, and then the average value of the remaining values except for the highest and minimum values is described in Table 1 below.

Amount of complex disintegrant (wt%) Tensile Strength (Kgf / ㎠) Elongation (%) Tear strength (Kgf / ㎠) Example 1 5 653 712 340 Example 2 8 645 690 320 Example 3 10 631 668 305 Comparative Example 1 0 750 850 480 Comparative Example 2 3 665 743 400 Comparative Example 3 15 597 570 285

As can be seen from Table 1, the physical properties of Examples 1 to 3 based on Comparative Example 1 in which the complex decomposition agent is not mixed, although the physical properties did not significantly decrease, Experimental Example 3 in which the complex decomposition agent was excessively added In the case of, the physical properties, in particular the elongation, etc. were very low.

Experimental Example  One

Example 1? 3 and Comparative Example 1? The biodegradability of the film prepared in 3 was measured and the results are shown in Table 2.

Compost: 70 wt% food waste, 20 wt% sawdust and 10 wt% prefabricated food waste compost were mixed, fermented in an acrylic reactor for about 17 days and then aged for 14 days.

Sample: Example 1? 3 and Comparative Example 1? The polyurethane resin film prepared in 3 was mixed in the compost at a rate of about 5 wt%.

Experimental apparatus: The experimental apparatus was constructed based on US ASTM D5209-92. The reactor (Testing Bottle, 2.5L acrylic reactor) was maintained at 55 ± 2 ℃ for the culture of microorganisms. Two holes were drilled in the reactor to allow for air supply and capture of the generated carbon dioxide. At this time, in order to remove the carbon dioxide of the air supplied to the reactor 10N aqueous sodium hydroxide solution and 0.025N barium hydroxide aqueous solution 700ml each 1L Erlenmeyer flask was connected. In addition, in order to capture the generated carbon dioxide 200ml each of 0.4N potassium hydroxide solution and 0.1N barium hydroxide aqueous solution were put in a 250ml Pyrex tube was connected to the reactor. By placing the empty bottle on the top of the reactor to condense the water evaporating from the reactor due to the continuous aeration, and supplying the collected moisture back to the reactor at regular intervals, the moisture content, which is the most important factor in measuring the biodegradability using the compost of the reactor It was kept constant.

Using the experimental material, Example 1? 3 and Comparative Example 1? The decomposition degree of the polyurethane resin film manufactured in 3 was measured. The biodegradability measurement experiment was conducted using the compost as a solid phase, and the sample was exposed to the surface as much as possible while mixing the equivalent of 5% by dry weight ratio with respect to 150 g of the compost (wet weight, moisture content 54.3%). Care was taken to avoid. The compost and the sample prepared in the culture bottle (three culture bottles per sample) were prepared, the carbon dioxide collector was connected to each incubator, and the decomposition experiment was started. In each batch experiment, the incubator without the sample was placed, and the amount of carbon dioxide generated in the compost was measured to observe the degree of decomposition. To prevent drying of the compost due to continued aeration, the water condensed by condensation was collected and fed back to the reactor.

The generated carbon dioxide was separated from the first carbon dioxide collector 3 to 4 days after the start of the experiment, and then continuously separated and quantified at about 1 week intervals. In order to quantify the amount of carbon dioxide generated, add 2N barium chloride solution and stir well in case of 0.4N potassium hydroxide solution to drop the carbon dioxide of carbon dioxide collected in the solution to precipitate. After titration, the solution was titrated with 0.2 N aqueous hydrochloric acid solution until the color became pink without stirring. In order to quantify the amount of carbon dioxide generated, 0.1 ml of phenolphthalein was added and titrated with 0.2 N aqueous hydrochloric acid solution until the color became colorless while stirring.

Then, the carbon dioxide generated in the sample was derived by subtracting the amount of carbon dioxide generated in the incubator without the sample from the amount of carbon dioxide generated in each incubator.

As shown in Table 2, it can be seen that the samples of Examples 1-3 have further improved degradability.

% Biodegradability of experimental group compared to cellulose Example 1 32 Example 2 52 Example 3 64 Comparative Example 1 5 Comparative Example 2 27 Comparative Example 3 85

Example  4

Polyurethane resin and nylon resin (purchased from SK Chemicals) prepared in Example 1 were introduced into a two-layer extruder to be extruded and laminated at the same time to prepare a food packaging film according to the present invention.

Experimental Example  2

Material test and dissolution test for the film prepared in Example 4 And standards and standards for containers and packaging), and the results are shown in Table 3.

Test Items unit Standard standard Test result material
exam Lead (Pb) mg / kg
100 or less
Not detected (detection limit 5) Cadmium (Cd) Not detected (detection limit 5)
Elution
exam Heavy metals: as lead
mg / ℓ

1.0 or less 1.0 or less Potassium Permanganate Consumption below 10 One Evaporation residue: With 4% acetic acid 30 or less 5 Isocyanate 0.1 or less Not detected (detection limit 0.05)

As can be seen from Table 3 the film according to the invention was suitable for food packaging.

Experimental Example  3

The degree of influence on the cytotoxicity or cell growth of the material eluted from the film prepared in Example 4 was tested, and the results are shown in FIGS. 1 and 2.

 In the case of vacuum packaging meat, plant foods, etc., in order to investigate the effects of cytotoxicity caused by the substance eluted from the film or the effect of cell growth by the eluate, the animal cell line uses a PC-3 cell line, Elution in boiling water) and 70% ethanol (enthanol) was added to the control of DMEM and experimental groups for each concentration, and grown and the number of cell lines was measured. As can be seen from FIGS. 1 and 2, the addition of the hot water soluble extract additive and the alcohol soluble extract had no effect on the increase in cell number, and the addition concentration of the extract (1-10 μg / L) was not affected. It was confirmed that it was not affected, the film of the present invention is completely harmless to the packaged foods and the like.

Experimental Example  4

Oxygen permeability and moisture permeability of the film prepared in Example 4 was measured for oxygen permeability tester (OX-TRAN, Model 2/61 (MOCON, USA)) and moisture permeability tester (PERMATRAN-W, Model 3/61 (MOCON, USA)) It measured using, and the result is shown in Table 4.

Test Items unit Test result Test Methods Oxygen permeability: (23 ± 2) ℃ Cm3 / ㎡day 38 ASTM F 1927: 2007 Water vapor transmission rate: (38 ± 2) degrees Celsius, 100% R.H g / ㎡day More than 500 ASTM F 1249: 2006

As can be seen from Table 4, the film of the present invention was excellent in oxygen permeability and moisture permeability and was suitable for food packaging.

Claims (5)

Dicumyl peroxide 10? To the weight of polyol prepared by condensation polymerization of carboxylic acid and diol. 20% by weight, sodium powder 4? 6% by weight, silver nanoparticles 20? 30% by weight, zinc powder 7? 11 weight%, zeolite powder 8? 12 wt%, calcium carbonate 0.1? 2% by weight and methylene bis stearamide or ethylene bis stearamide 9? The composite disintegrating agent prepared by mixing and reacting 11% by weight was 5? A decomposable food packaging film, wherein 10% by weight of a polyurethane resin and a nylon resin are added to a biaxial stretching extrusion molding machine, and extruded and laminated.
Condensation polymerization of the carboxylic acid and the alcohol to form a polyol; Preparing a complex decomposition agent by reacting the polyol, dicumyl peroxide, sodium powder, silver nanoparticles, zinc powder, zeolite powder, calcium carbonate and methylene bis stearamide or ethylene bis stearamide; Mixing the complex disintegrating agent with polyurethane; And injecting the prepared polyurethane resin and nylon resin into a two-layer extruder, and simultaneously molding the polyurethane resin and nylon resin into a two-layer extruder.
The method of claim 2, wherein the polylactic acid is added in the step of reacting the composite disintegrating agent with the polyurethane.
The polyurethane resin film and the nylon resin film have a thickness of 1: 2? 2: A method for producing a degradable food packaging film, characterized in that to be laminated at a ratio of 1: 1.
Condensation polymerization of the carboxylic acid and the alcohol to form a polyol; Preparing a complex decomposition agent by reacting the polyol, dicumyl peroxide, sodium powder, silver nanoparticles, zinc powder, zeolite powder, calcium carbonate and methylene bis stearamide or ethylene bis stearamide; Mixing the complex disintegrating agent with polyurethane; And a polyurethane film, nylon resin and polylactic acid resin prepared in a three-layer extruder, extruded and laminated at the same time, laminated with nylon resin as the outer layer, polyurethane resin as the middle layer, and polylactic acid resin as the inner layer. Method for producing a low-temperature shrink film comprising the step of preparing a.

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