CN109897258B - Plastic film capable of being used on inner surface of lunch box and preparation method thereof - Google Patents
Plastic film capable of being used on inner surface of lunch box and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a plastic film capable of being used on the inner surface of a lunch box and a preparation method thereof, wherein the plastic film capable of being used on the inner surface of the lunch box comprises an upper surface layer, a lower surface layer and a middle layer; the raw materials for preparing the upper and lower surface layers of the plastic film which can be used on the inner surface of the lunch box comprise: polyethylene, tea polyphenol, purple sweet potato starch, methyl p-hydroxybenzoate and sodium carboxymethylcellulose; the raw materials for preparing the plastic film middle layer which can be used on the inner surface of the lunch box comprise: polyethylene, tea polyphenol, purple sweet potato starch, methyl p-hydroxybenzoate, sodium carboxymethylcellulose and wood dust; by adopting the preparation method, all the raw materials are matched with each other, and the prepared plastic film material which can be used on the inner surface of the lunch box is green and environment-friendly, can be rapidly degraded and has the effect of efficiently adsorbing oil stains; the preparation method is simple and can be widely applied.
Description
Technical Field
The invention relates to the field of film production and processing, in particular to a plastic film capable of being used on the inner surface of a lunch box and a preparation method thereof.
Background
With the development of science and technology and the progress of times, the living standard of human beings is gradually improved, and more people pay special attention to quality and service. The fast pace of life has become the mainstream of the times, and the fast food industry which is aroused along with the fast food industry is rapidly developed, and the fast food box is widely used, so that the requirements on the quality of the fast food box are higher and higher, after all, the fast food box can be widely used, the pressure on the environment is also huge, and meanwhile, whether the fast food box can be truly healthy and harmless or not is also a topic which is extremely concerned by consumers. At present, the plastic film which can be used on the inner surface of the lunch box is prepared to improve the dining hygiene of consumers, has the characteristics of health, harmlessness and small environmental pollution, and is particularly important in the current life.
The invention discloses a modified starch-polyethylene composite plastic film and a preparation method thereof, relating to the technical field of plastic film production and being prepared from the following raw materials in parts by mass: 80-100 parts of starch, 45-55 parts of polyethylene, 4-5 parts of 30% hydrogen peroxide, 4.5-6 parts of sulfuric acid, 10-15 parts of glycerol, 5-10 parts of fish phosphorus glue, 5-8 parts of polylactic acid, 3-8 parts of nano silicon dioxide, 5-10 parts of paraffin, 1-4 parts of peroxide and 150 parts of water, wherein the modified starch is mixed with other raw materials according to the proportion, and then is subjected to melting, extrusion, blow molding, cooling and reeling to form a film. The plastic film prepared by the invention has high strength and low cost, is biodegradable, can effectively relieve the problem of white pollution, has poor mechanical property, can not be used for a long time, and is not beneficial to the production of the composite plastic film because the sulfuric acid and the peroxide in the raw materials have strong corrosivity and oxidability.
The invention patent of Chinese patent CN104845400A provides a disposable oil-proof and water-proof degradable lunch box prepared from straws and a preparation method thereof. The invention discloses a disposable oil-proof and water-proof degradable lunch box prepared from straws, which is prepared from the following raw materials in parts by weight: 50-100 parts of corn straw, 50-100 parts of wheat straw, 50-100 parts of perilla straw, 50-100 parts of bamboo leaf, 1-7 parts of auxiliary agent, 0.5-2.5 parts of oil-proofing agent and 0.5-2.5 parts of paraffin. The disposable oil-proof and water-proof degradable lunch box prepared from the straws has the advantages of good oil-proof and water-proof properties, simple manufacturing process, low production cost, degradability, safety and no toxicity; the lunch box prepared by adopting the straws and the auxiliary agent has the advantages of insufficient structural strength, easy deformation and narrow application range.
In order to solve the problems that the existing snack box is unstable in product structure and poor in oil stain adsorption performance, is not beneficial to the health of consumers and is difficult to degrade after being used for a long time, the plastic film which is simple in process, low in production cost, capable of realizing rapid degradation and high-efficiency oil stain adsorption and can be used on the inner surface of the snack box is provided, and the plastic film is pressed on the inner surface of the snack box to solve the problems.
Disclosure of Invention
The invention mainly aims to provide a plastic film capable of being used on the inner surface of a snack box and a preparation method thereof, and aims to solve the problems that in the prior art, snack box products are unstable in structure, poor in oil stain adsorption performance, not beneficial to the health of consumers after being used for a long time, and difficult to degrade.
In order to achieve the above object, the present invention provides a plastic film for an inner surface of a lunch box, the plastic film for an inner surface of a lunch box comprises upper and lower surface layers and an intermediate layer; the upper surface of the plastic film which can be used on the inner surface of the lunch box contains fine apertures which are uniformly distributed; the raw materials for preparing the upper and lower surface layers of the plastic film which can be used on the inner surface of the lunch box comprise the following components in parts by weight: 50-60 parts of polyethylene, 10-15 parts of tea polyphenol, 2-4 parts of purple sweet potato starch, 1-1.5 parts of methyl p-hydroxybenzoate and 2-4 parts of sodium carboxymethylcellulose; the plastic film interlayer for preparing the inner surface of the lunch box comprises the following raw materials in parts by weight: 50-60 parts of polyethylene, 10-15 parts of tea polyphenol, 2-4 parts of purple sweet potato starch, 1-1.5 parts of methyl p-hydroxybenzoate, 2-4 parts of sodium carboxymethylcellulose and 1-2 parts of wood dust.
Further, the raw materials for preparing the upper and lower surface layers of the plastic film which can be used on the inner surface of the lunch box comprise the following components in parts by weight: 55 parts of polyethylene, 12 parts of tea polyphenol, 3 parts of purple sweet potato starch, 1.2 parts of methyl p-hydroxybenzoate and 3 parts of sodium carboxymethylcellulose; the plastic film interlayer for preparing the inner surface of the lunch box comprises the following raw materials in parts by weight: 55 parts of polyethylene, 12 parts of tea polyphenol, 3 parts of purple sweet potato starch, 1.2 parts of methyl p-hydroxybenzoate, 3 parts of sodium carboxymethylcellulose and 1.5 parts of wood chips.
Furthermore, the thickness of the upper and lower surface layers and the thickness of the middle layer of the plastic film which can be used on the inner surface of the lunch box are respectively 10 μm.
Furthermore, the mesh number of the sawdust is 200 meshes to 300 meshes.
According to another aspect of the present invention, there is provided a method for preparing a plastic film for use on an inner surface of a lunch box, comprising the steps of:
step a, preparing the sodium carboxymethylcellulose in parts by weight into a solution with the viscosity of 300-500 mpa · s, adding the purple sweet potato starch in parts by weight, and performing ultrasonic treatment at the temperature of 60-65 ℃ for 1-2 hours to obtain a mixed solution;
b, adding the polyethylene, the tea polyphenol and the methyl p-hydroxybenzoate in parts by weight into a stirring kettle preheated to 85-90 ℃ in advance, heating the stirring kettle to 145-155 ℃ at the speed of 5-8 ℃/min, keeping the temperature for 15min, adding the mixed solution obtained in the step a, and stirring uniformly to obtain a mixed material;
c, continuously heating the mixed material obtained in the step b to 185-195 ℃, uniformly dividing three groups of the mixed material into No. 1, No. 2 and No. 3 hoppers of the extruder, rotating screws of the extruder at the rotating speed of 400-600 r/min, respectively fusing, passing through a sub-runner, and extruding into a thin-wall pipe through the annular mouth mold gap of the machine head;
and d, after extrusion, blowing the plastic film by using compressed air in a flowing state, cooling to 10-15 ℃ for shaping, performing needling on the upper surface of the plastic film to obtain uniformly distributed fine apertures, flattening, trimming and winding to obtain the plastic film capable of being used on the inner surface of the lunch box.
Further, in the step c, in the continuous heating process, when the water content is controlled to be 10-15%, uniformly dividing the mixed material and adding the mixed material into an extruder.
Further, in step c, the wood chips are added into the hopper No. 2 according to the weight part.
Furthermore, in the step c, a layer of screen mesh of 40 meshes to 50 meshes is attached to the opening of the sub-runner.
Furthermore, in the step d, the interval distance between the uniformly distributed fine apertures is 3 mm-4 mm.
Furthermore, in the step d, the pore diameter depth of the uniformly distributed fine pore diameters is 10 to 12 μm.
The invention has the advantages and beneficial effects that:
1. the plastic film which can be used on the inner surface of the lunch box and is prepared by adopting a polyethylene material with lower cost has excellent toughness and stable and reliable quality; the purple sweet potato starch and the sodium carboxymethyl cellulose are matched, so that the mechanical strength of the yew starch is improved, and the stability of the purple sweet potato starch is improved;
2. the plastic film capable of being used on the inner surface of the lunch box is prepared by adopting a three-layer co-extrusion preparation method, the upper surface of the prepared film is uniformly distributed with fine apertures, partial oil stains can be adsorbed, the oil stains are absorbed by the middle layer film, the oil stains are prevented from leaking outside, and inconvenience in eating is improved; the lower surface is tightly pressed with the snack box at the same time, so that the overall high strength and the structural stability of the snack box are not influenced;
3. the plastic film which can be used on the inner surface of the snack box and is prepared in the application adopts polyethylene and tea polyphenol as raw materials, so that the internal environment of the snack box can be improved, harmful substances are prevented from being brought in when the plastic film is combined with food, the health of human bodies is ensured, and meanwhile, the tea polyphenol has oxidation resistance and can ensure the freshness and delicious taste of the food;
4. the invention has simple preparation process and short preparation period, optimizes various preparation parameters, overcomes the difference of raw materials to achieve the required technical effect, and can well coordinate the problems of product quality and cost.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail with reference to examples.
As described in the background section, the conventional plastic film is complicated and expensive to manufacture, and in order to solve this problem, the present invention provides a plastic film that can be used on the inner surface of a lunch box.
Example 1
Plastic film capable of being used on inner surface of lunch box
The raw materials for preparing the upper and lower surface layers of the plastic film which can be used on the inner surface of the lunch box comprise the following components in parts by weight: 5000g of polyethylene, 1000g of tea polyphenol, 200g of purple sweet potato starch, 100g of methyl p-hydroxybenzoate ester and 200g of sodium carboxymethylcellulose; the plastic film interlayer for preparing the inner surface of the lunch box comprises the following raw materials in parts by weight: 5000g of polyethylene, 1000g of tea polyphenol, 200g of purple sweet potato starch, 100g of methyl p-hydroxybenzoate, 200g of sodium carboxymethylcellulose and 100g of wood dust.
The preparation method comprises the following steps:
step a, preparing the sodium carboxymethylcellulose in parts by weight into a solution with the viscosity of 300mpa & s, adding the purple sweet potato starch in parts by weight, and performing ultrasonic treatment at the temperature of 60 ℃ for 1 hour to obtain a mixed solution;
b, adding the polyethylene, the tea polyphenol and the methyl p-hydroxybenzoate in parts by weight into a stirring kettle preheated to 85 ℃ in advance, heating the stirring kettle to 145 ℃ at the speed of 5 ℃/min, keeping the temperature for 15min, adding the mixed solution obtained in the step a, and stirring uniformly to obtain a mixed material;
c, continuously heating the mixed material obtained in the step b to 185 ℃, when the water content is controlled to be 10%, uniformly dividing three groups of the mixed material into No. 1, No. 2 and No. 3 hoppers of the extruder, simultaneously adding the wood chips in parts by weight into the No. 2 hopper, rotating screws of the extruder at the rotating speed of 400r/min, respectively fusing, passing through a sub-runner, and extruding into a thin-walled tube through the annular mouth mold gap of the machine head;
and d, after extrusion, blowing the plastic film by using compressed air in a flowing state, cooling to 10 ℃ for shaping, performing needling on the upper surface of the plastic film to obtain uniformly distributed fine apertures, flattening, trimming and rolling to obtain the plastic film capable of being used on the inner surface of the lunch box.
In the operation, a layer of 40-mesh screen is attached to the opening of the sub-runner; each aperture was spaced apart by a distance of 3mm and each aperture had a depth of 10 μm.
Example 2
Plastic film capable of being used on inner surface of lunch box
The raw materials for preparing the upper and lower surface layers of the plastic film which can be used on the inner surface of the lunch box comprise the following components in parts by weight: 6000g of polyethylene, 1500g of tea polyphenol, 400g of purple sweet potato starch, 150g of methyl p-hydroxybenzoate ester and 400g of sodium carboxymethylcellulose; the plastic film interlayer for preparing the inner surface of the lunch box comprises the following raw materials in parts by weight: 6000g of polyethylene, 1500g of tea polyphenol, 400g of purple sweet potato starch, 150g of methyl p-hydroxybenzoate, 400g of sodium carboxymethylcellulose and 200g of wood dust.
The preparation method comprises the following steps:
step a, preparing the sodium carboxymethylcellulose in parts by weight into a solution with the viscosity of 500mpa & s, adding the purple sweet potato starch in parts by weight, and performing ultrasonic treatment at the temperature of 65 ℃ for 2 hours to obtain a mixed solution;
b, adding the polyethylene, the tea polyphenol and the methyl p-hydroxybenzoate in parts by weight into a stirring kettle preheated to 90 ℃ in advance, heating the stirring kettle to 155 ℃ at the speed of 8 ℃/min, keeping the temperature for 15min, adding the mixed solution obtained in the step a, and stirring uniformly to obtain a mixed material;
c, continuously heating the mixed material obtained in the step b to 195 ℃, when the water content is controlled to be 15%, uniformly dividing three groups into three groups, adding the three groups into No. 1, No. 2 and No. 3 hoppers of the extruder, simultaneously adding the wood chips in parts by weight into the No. 2 hopper, rotating screws of the extruder at the rotating speed of 600r/min, respectively fusing, passing through a sub-runner, and extruding into a thin-walled tube through the annular mouth mold gap of the machine head;
and d, after extrusion, blowing the plastic film by using compressed air in a flowing state, cooling to 15 ℃ for shaping, performing needling on the upper surface of the plastic film to obtain uniformly distributed fine apertures, flattening, trimming and rolling to obtain the plastic film capable of being used on the inner surface of the lunch box.
In the operation, a layer of 50-mesh screen is attached to the opening of the sub-runner; each aperture was spaced apart by a distance of 4mm and each aperture had a depth of 12 μm.
Example 3
Plastic film capable of being used on inner surface of lunch box
The raw materials for preparing the upper and lower surface layers of the plastic film which can be used on the inner surface of the lunch box comprise the following components in parts by weight: 5200g of polyethylene, 1300g of tea polyphenol, 260g of purple sweet potato starch, 120g of methyl p-hydroxybenzoate and 260g of sodium carboxymethylcellulose; the plastic film interlayer for preparing the inner surface of the lunch box comprises the following raw materials in parts by weight: 5200g of polyethylene, 1300g of tea polyphenol, 260g of purple sweet potato starch, 120g of methyl paraben, 260g of sodium carboxymethylcellulose and 120g of wood chips.
The preparation method comprises the following steps:
step a, preparing the sodium carboxymethylcellulose in parts by weight into a solution with the viscosity of 400mpa & s, adding the purple sweet potato starch in parts by weight, and performing ultrasonic treatment at the temperature of 62 ℃ for 1.2h to obtain a mixed solution;
b, adding the polyethylene, the tea polyphenol and the methyl p-hydroxybenzoate in parts by weight into a stirring kettle preheated to 85 ℃ in advance, heating the stirring kettle to 148 ℃ at the speed of 6 ℃/min, keeping the temperature for 15min, adding the mixed solution obtained in the step a, and stirring uniformly to obtain a mixed material;
c, continuously heating the mixed material obtained in the step b to 188 ℃, when the water content is controlled to be 12%, uniformly dividing three groups of the mixed material into No. 1, No. 2 and No. 3 hoppers of the extruder, simultaneously adding the wood chips in parts by weight into the No. 2 hopper, rotating screws of the extruder at the rotating speed of 450r/min, respectively fusing, passing through a sub-runner, and extruding into a thin-walled tube through the annular mouth mold gap of the machine head;
and d, after extrusion, blowing the plastic film by using compressed air in a flowing state, cooling to 12 ℃ for shaping, performing needling on the upper surface of the plastic film to obtain uniformly distributed fine apertures, flattening, trimming and rolling to obtain the plastic film capable of being used on the inner surface of the lunch box.
In the operation, a layer of 40-mesh screen is attached to the opening of the sub-runner; each aperture was spaced apart by a distance of 3mm and each aperture had a depth of 10 μm.
Example 4
Plastic film capable of being used on inner surface of lunch box
The raw materials for preparing the upper and lower surface layers of the plastic film which can be used on the inner surface of the lunch box comprise the following components in parts by weight: 5800g of polyethylene, 1400g of tea polyphenol, 320g of purple sweet potato starch, 140g of methyl p-hydroxybenzoate ester and 320g of sodium carboxymethylcellulose; the plastic film interlayer for preparing the inner surface of the lunch box comprises the following raw materials in parts by weight: 5800g of polyethylene, 1400g of tea polyphenol, 320g of purple sweet potato starch, 140g of methyl p-hydroxybenzoate ester, 320g of sodium carboxymethylcellulose and 180g of sawdust.
The preparation method comprises the following steps:
step a, preparing the sodium carboxymethylcellulose in parts by weight into a solution with the viscosity of 300mpa & s, adding the purple sweet potato starch in parts by weight, and performing ultrasonic treatment at the temperature of 65 ℃ for 1.6h to obtain a mixed solution;
b, adding the polyethylene, the tea polyphenol and the methyl p-hydroxybenzoate in parts by weight into a stirring kettle preheated to 90 ℃ in advance, heating the stirring kettle to 152 ℃ at the speed of 7 ℃/min, keeping the temperature for 15min, adding the mixed solution obtained in the step a, and stirring uniformly to obtain a mixed material;
c, continuously heating the mixed material obtained in the step b to 192 ℃, when the water content is controlled to be 13%, uniformly dividing three groups of the mixed material into No. 1, No. 2 and No. 3 hoppers of the extruder, simultaneously adding the wood chips in parts by weight into the No. 2 hopper, rotating screws of the extruder at the rotating speed of 550r/min, respectively fusing, passing through a sub-runner, and extruding into a thin-walled tube through the annular mouth mold gap of the machine head;
and d, after extrusion, blowing the plastic film by using compressed air in a flowing state, cooling to 14 ℃ for shaping, performing needling on the upper surface of the plastic film to obtain uniformly distributed fine apertures, flattening, trimming and rolling to obtain the plastic film capable of being used on the inner surface of the lunch box.
In the operation, a layer of 50-mesh screen is attached to the opening of the sub-runner; each aperture was spaced apart by a distance of 4mm and each aperture had a depth of 12 μm.
Example 5
Plastic film capable of being used on inner surface of lunch box
The raw materials for preparing the upper and lower surface layers of the plastic film which can be used on the inner surface of the lunch box comprise the following components in parts by weight: 5500g of polyethylene, 1200g of tea polyphenol, 300g of purple sweet potato starch, 120g of methyl p-hydroxybenzoate ester and 300g of sodium carboxymethylcellulose; the plastic film interlayer for preparing the inner surface of the lunch box comprises the following raw materials in parts by weight: 5500g of polyethylene, 1200g of tea polyphenol, 300g of purple sweet potato starch, 120g of methyl p-hydroxybenzoate ester, 300g of sodium carboxymethylcellulose and 150g of wood dust.
The preparation method comprises the following steps:
step a, preparing the sodium carboxymethylcellulose in parts by weight into a solution with the viscosity of 400mpa & s, adding the purple sweet potato starch in parts by weight, and performing ultrasonic treatment at 63 ℃ for 1.5 hours to obtain a mixed solution;
b, adding the polyethylene, the tea polyphenol and the methyl p-hydroxybenzoate in parts by weight into a stirring kettle preheated to 90 ℃ in advance, heating the stirring kettle to 150 ℃ at the speed of 6 ℃/min, keeping the temperature for 15min, adding the mixed solution obtained in the step a, and stirring uniformly to obtain a mixed material;
c, continuously heating the mixed material obtained in the step b to 190 ℃, when the water content is controlled to be 15%, uniformly dividing three groups of the mixed material into No. 1, No. 2 and No. 3 hoppers of the extruder, simultaneously adding the wood chips in parts by weight into the No. 2 hopper, rotating screws of the extruder at the rotating speed of 500r/min, respectively fusing, passing through a sub-runner, and extruding into a thin-walled tube through the annular mouth mold gap of the machine head;
and d, after extrusion, blowing the plastic film by using compressed air in a flowing state, cooling to 15 ℃ for shaping, performing needling on the upper surface of the plastic film to obtain uniformly distributed fine apertures, flattening, trimming and rolling to obtain the plastic film capable of being used on the inner surface of the lunch box.
In the operation, a layer of 50-mesh screen is attached to the opening of the sub-runner; each aperture was spaced apart by a distance of 3mm and each aperture had a depth of 11 μm.
To further illustrate the technical advancement of the present invention, experimental examples are now used for further illustration.
Experimental example 1
Experimental materials: the plastic film snack box produced according to embodiments 1-5 of the present invention can be used on the inner surface of a snack box.
The test method comprises the following steps: comparing the performances of various fast food boxes under the same condition.
TABLE 1 comparison of the performance of snack boxes laminated with plastic films capable of being used on the inner surface of the snack box produced according to examples 1-5 of the present invention
It can be seen from the above experimental examples that, under the same conditions, the snack box whose inner surface is pressed with the plastic film which can be used on the inner surface of the snack box and is produced according to the embodiments 1-5 of the present invention has good oil stain adsorption performance, so that inconvenience in eating caused by outflow of oil stains is avoided through adsorption, and meanwhile, the snack box has a good fresh-keeping effect on food, so as to ensure the taste, and the snack box has good product stability and is not easy to deform.
Experimental example 2
And (4) comparing items: the degradation rate of the commercially available snack boxes and the snack boxes with the plastic films laminated on the inner surfaces thereof, which can be used on the inner surfaces of the snack boxes, produced according to embodiments 1-5 of the present invention.
The test method comprises the following steps: the degradation rates of various snack boxes were compared under the same conditions.
Table 2 comparison of the performance of the snack box having the plastic film laminated on the inner surface thereof, which can be used on the inner surface of the snack box, according to the embodiments 1 to 5 of the present invention
| Material | 3 months degraded proportion |
| Commercial snack box | 75％ |
| Snack box of embodiment 1 with inner surface pressed | 82％ |
| Snack box of embodiment 2 with inner surface pressed | 88％ |
| Snack box of embodiment 3 with inner surface pressed | 89％ |
| Snack box of embodiment 4 with inner surface pressed | 90％ |
| Snack box of embodiment 5 with inner surface pressed | 85％ |
The experimental examples show that the raw materials of the plastic film which is produced by the preparation method and can be used on the inner surface of the snack box contain wood dust, so that the degradation rate of the snack box can be increased, the degradation rate can reach 82% in 3 months, and the preparation method is more suitable for popularization and application.
The above description is only a preferred embodiment and an experimental example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The plastic film capable of being used on the inner surface of the lunch box is characterized by comprising an upper surface layer, a lower surface layer and a middle layer; the upper surface of the plastic film which can be used on the inner surface of the lunch box is provided with fine apertures which are uniformly distributed; the plastic film upper and lower surface layers which can be used on the inner surface of the lunch box are prepared from the following raw materials in parts by weight: 50-60 parts of polyethylene, 10-15 parts of tea polyphenol, 2-4 parts of purple sweet potato starch, 1-1.5 parts of methyl p-hydroxybenzoate and 2-4 parts of sodium carboxymethylcellulose; the plastic film interlayer for preparing the inner surface of the lunch box comprises the following raw materials in parts by weight: 50-60 parts of polyethylene, 10-15 parts of tea polyphenol, 2-4 parts of purple sweet potato starch, 1-1.5 parts of methyl p-hydroxybenzoate, 2-4 parts of sodium carboxymethylcellulose and 1-2 parts of sawdust.
2. The plastic film for the inner surface of a lunch box as claimed in claim 1, wherein the raw materials for preparing the upper and lower surface layers of the plastic film for the inner surface of a lunch box comprise, by weight: 55 parts of polyethylene, 12 parts of tea polyphenol, 3 parts of purple sweet potato starch, 1.2 parts of methyl p-hydroxybenzoate and 3 parts of sodium carboxymethylcellulose; the plastic film interlayer for preparing the inner surface of the lunch box comprises the following raw materials in parts by weight: 55 parts of polyethylene, 12 parts of tea polyphenol, 3 parts of purple sweet potato starch, 1.2 parts of methyl p-hydroxybenzoate, 3 parts of sodium carboxymethylcellulose and 1.5 parts of wood chips.
3. A plastic film for the inner surface of a lunch box as claimed in claim 1, wherein the thickness of the upper and lower surface layers and the thickness of the middle layer of the plastic film for the inner surface of a lunch box are 10 μm respectively.
4. A plastic film for the inner surface of a lunch box as claimed in claim 1, wherein the wood dust has a mesh size of 200-300 mesh.
5. A method for preparing a plastic film for the inner surface of a lunch box according to any one of claims 1-4, comprising the following steps:
step a, preparing the sodium carboxymethylcellulose in parts by weight into a solution with the viscosity of 300-500 mpa · s, adding the purple sweet potato starch in parts by weight, and performing ultrasonic treatment at the temperature of 60-65 ℃ for 1-2 hours to obtain a mixed solution;
b, adding the polyethylene, the tea polyphenol and the methyl p-hydroxybenzoate in parts by weight into a stirring kettle preheated to 85-90 ℃ in advance, heating the stirring kettle to 145-155 ℃ at the speed of 5-8 ℃/min, keeping the temperature for 15min, adding the mixed solution obtained in the step a, and stirring uniformly to obtain a mixed material;
c, continuously heating the mixed material obtained in the step b to 185-195 ℃, uniformly dividing three groups of the mixed material into No. 1, No. 2 and No. 3 hoppers of the extruder, rotating screws of the extruder at the rotating speed of 400-600 r/min, respectively fusing, passing through a shunt channel, and extruding into a thin-wall pipe through the annular mouth die gap of the machine head;
d, after extrusion, blowing the plastic film by using compressed air in a flowing state, cooling to 10-15 ℃ for shaping, performing needling on the upper surface of the plastic film to obtain uniformly distributed fine apertures, and after flattening, trimming and winding to obtain the plastic film capable of being used on the inner surface of the lunch box;
in the step c, the wood chips in the weight part are also required to be added into the hopper No. 2.
6. The method according to claim 5, wherein in the step c, when the water content is controlled to be 10% to 15% during the continuous heating, the mixed material is equally divided and fed into the extruder.
7. The method as claimed in claim 5, wherein in step c, a 40-50 mesh screen is attached to the branch port.
8. The method according to claim 5, wherein in the step d, the uniformly distributed fine pores are spaced at a distance of 3mm to 4 mm.
9. The method according to claim 5, wherein in the step d, the pore diameter depth of the uniformly distributed fine pore diameters is 10 μm to 12 μm.
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| CN208031011U (en) * | 2017-06-16 | 2018-11-02 | 珠海得米新材料有限公司 | A kind of food pad |
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| US20160303837A1 (en) * | 2013-12-20 | 2016-10-20 | E I Du Pont De Nemours And Company | Selectively permeable ethylene copolymer compositions |
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| CN109897258A (en) | 2019-06-18 |
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