A polyolefin material packaging bag

Abstract

The application relates to the technical field of packaging bags, and discloses a polyolefin material packaging bag, a packaging bag body, the packaging bag body is composed of a composite layer, the composite layer comprises a base layer, surface layers and inner layers located on the two sides of the base layer, and the base layer, the surface layers and the inner layers are compression-molded; the base layer comprises the following components in a proportion: 80-100 parts of polyolefin powder, 2-6 parts of rare earth antioxidant, 0.5-1.5 parts of ultraviolet absorber, 2-4 parts of phosphogypsum whisker, 1-3 parts of nano diatomite, 1-3 parts of dispersing agent, 1-3 parts of silane coupling agent, 1-1.5 parts of antibacterial agent, 5-10 parts of processing aid, 0.1-1 part of halogen absorber; by adding the antibacterial agent, the packaging bag can reduce the disease spread caused by the carrying of pathogenic bacteria during transportation and express delivery, and is cleaner and more sanitary; the base layer prepared by combining the composite olefin powder and the antioxidant has better antioxidant capacity, and the antioxidant performance of the packaging bag is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of packaging bags, in particular to a packaging bag made of polyolefin material. BACKGROUND

[0002] With the development of the network era, online shopping and overseas purchasing industry have emerged, and goods are often transported by express delivery and logistics. During the transportation process, express packaging bags are often used. Common express plastic bags, bubble bags, bone bags and woven bags are made of polyethylene and polypropylene materials.

[0003] The prior art discloses a kind of polyolefin material (CN109486011A) for packaging bag, raw materials include: polypropylene, rare earth antioxidant, ultraviolet absorber, phosphogypsum whisker, nano diatomite, dispersing agent, silane coupling agent, rare earth antioxidant is prepared by following process: citric acid is added to water, N-hydroxyethylenediamine is added, heated and stirred to reflux reaction, then soluble rare earth salt is added, after continuous reaction, filter and dry to obtain rare earth antioxidant. The polyolefin material for packaging bag of the present application has excellent aging resistance, high safety performance and wide application prospect.

[0004] Ordinary packaging bags will rapidly multiply under suitable conditions during the transportation of goods if they come into contact with bacteria and viruses during use, and pathogens will spread and spread. Pathogens will spread and spread through express packaging bags during the transportation process, threatening people's health. Therefore, applying an antibacterial and antiviral express packaging bag to the transportation of goods will control the spread of pathogens at the source, greatly reducing the risk of pathogen spread. At the same time, the single substrate polypropylene material is prone to aging, the mechanical properties change significantly, and the safety performance is low. There is a certain optimization space for the antibacterial and antioxidant properties of existing polypropylene packaging bags.

[0005] Therefore, we propose a packaging bag made of polyolefin material. SUMMARY

[0006] The present application mainly solves the technical problems of easy oxidation and bacterial growth of the above packaging bag, and provides a packaging bag made of polyolefin material.

[0007] In order to achieve the above purpose, the present application adopts the following technical scheme, a packaging bag made of polyolefin material, comprising:

[0008] The packaging bag body is composed of a composite layer, the composite layer includes a base layer, a surface layer and an inner layer on both sides of the base layer, the base layer, the surface layer and the inner layer are compression molded, and the base layer is polyolefin.

[0009] The base layer comprises the following components in the following proportions: 80-100 parts of polyolefin powder, 2-6 parts of rare earth antioxidant, 0.5-1.5 parts of ultraviolet absorber, 2-4 parts of phosphogypsum whisker, 1-3 parts of nano diatomite, 1-3 parts of dispersing agent, 1-3 parts of silane coupling agent, 1-1.5 parts of antibacterial agent, 5-10 parts of processing aid, 0.1-1 part of halogen absorber.

[0010] As a preferred mode of the present application, the antibacterial agent is one or a mixture of more than one of vanillin, thiazole, isothiazolone derivative, imidazole, polyhexamethylene guanidine hydrochloride, zinc oxide, copper oxide, ammonium dihydrogen phosphate, lithium carbonate.

[0011] As a preferred mode of the present application, the processing aid is PPA containing 5% organic fluorine compound, which is a copolymer of fluoroolefin or a copolymer of fluoroolefin and other olefin.

[0012] As a preferred mode of the present application, the phosphogypsum whisker has a particle size of 0.5-5 μm, and the dispersing machine is polyethylene wax.

[0013] As a preferred mode of the present application, the base layer is in a wavy shape, and the surface layer is a copolymer mixture of high-pressure polyethylene LDPE (90-100 parts), linear polyethylene LLDPE (150-200 parts), metallocene polyethylene MPE (100-150 parts) and processing aid (1.5-2 parts).

[0014] As a preferred mode of the present application, the surface layer is coated with a waterproof material on the outside, and the hydrophobic material has a thickness of 20-60 nm.

[0015] As a preferred mode of the present application, the halogen absorber is one or a mixture of more than one of zinc stearate, calcium stearate and synthetic hydrotalcite.

[0016] As a preferred mode of the present application, the polyolefin is one or a mixture of more than one of polypropylene and polyethylene.

[0017] As a preferred mode of the present application, the top surface and the bottom surface of the base layer are both coated with glue, the glue is polyolefin, and the surface layer and the inner layer are pressure-bonded with the glue to form a composite layer, wherein the top of the surface layer is further provided with a release film.

[0018] As a preferred mode of the present application, the release film is polyolefin.

[0019] The present application provides a packaging bag made of polyolefin material.

[0020] 1. The polyolefin material packaging bag, by adding antibacterial agent, can reduce the spread of diseases caused by carrying bacteria during transportation and express delivery, and is more clean and sanitary, and the base layer prepared by the composite olefin powder and the antioxidant has better antioxidant capacity, thereby improving the antioxidant performance of the packaging bag.

[0021] 2. The polyolefin material packaging bag, by stretching the multiple corrugations provided on the base layer, the unnecessary shrinkage of the base layer after heating can be reduced, the stretching of the base film is easier, and the problem of wrinkles of the existing polyolefin barrier film due to the material when encountering high temperature environment is avoided, thereby greatly affecting the appearance and practicability of the barrier film.

[0022] 3. The polyolefin material packaging bag, by setting the wave-shaped base layer, the surface layer and the inner layer are better in tensile deformation capacity, the overall performance is stronger, and local tearing is not easy to occur.

[0023] 4. The polyolefin material packaging bag, by coating the waterproof material, the surface layer outside the packaging bag has better hydrophobic capacity, thereby improving the moisture resistance and stain resistance.

[0024] 5. The polyolefin material packaging bag, by setting the composite inner layer, the entire packaging bag has better supporting performance, better strength, is more upright, and has light-proof and heat preservation performance.

[0025] 6. The polyolefin material packaging bag, by setting the release film, the surface layer can be protected, scratches and ravines are prevented, and damage during storage and transportation is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The figure is a schematic view of the composite layer of the present application.

[0027] Legend: 1, base layer; 2, surface layer; 3, inner layer. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0029] A polyolefin material packaging bag, such as Figure 1The package bag body is composed of a composite layer, the composite layer comprises a base layer 1, a surface layer 2 and an inner layer 3 located on both sides of the base layer, the base layer 1, the surface layer 2 and the inner layer 3 are compression molded, the base layer is polyolefin;

[0030] The top surface and the bottom surface of the base layer 1 are coated with glue, the glue is polyolefin, the surface layer 2 and the inner layer 3 are compression molded with the glue to form a composite layer, and the top of the surface layer 2 is also paved with a release film.

[0031] The release film is polyolefin, and the release film can protect the surface layer and prevent scratches from forming trenches, so that the surface layer is not easily damaged during storage and transportation.

[0032] The base layer comprises the following components in the following proportions: polyolefin powder 80-100 parts, rare earth antioxidant 2-6 parts, ultraviolet absorber 0.5-1.5 parts, phosphogypsum whisker 2-4 parts, nano diatomite 1-3 parts, dispersing agent 1-3 parts, silane coupling agent 1-3 parts, antibacterial agent 1-1.5 parts, processing aid 5-10 parts, and halogen absorber 0.1-1 part.

[0033] The antibacterial agent is one or a mixture of one or more of vanillin, thiazole, isothiazolone derivative, imidazole, polyhexamethylene guanidine hydrochloride, zinc oxide, copper oxide, ammonium dihydrogen phosphate, and lithium carbonate, so that the entire package bag can reduce the spread of diseases caused by the carrying of bacteria during transportation and express delivery, and is cleaner and more sanitary.

[0034] The processing aid is PPA containing 5% organic fluorine compounds, and the organic fluorine compounds are copolymers of fluoroolefins or copolymers of fluoroolefins and other olefins.

[0035] The phosphogypsum whisker has a particle size of 0.5-5 microns, and the dispersing machine is polyethylene wax.

[0036] The base layer is wavy, and stretching the multiple corrugations provided on the base layer can reduce unnecessary shrinkage of the base layer after heating, making it easier to stretch the base film and avoiding the problem that existing polyolefin barrier films will shrink when exposed to high temperature environments due to material properties, thereby causing wrinkles in the overall barrier film and greatly affecting the appearance and practicality of the barrier film.

[0037] The surface layer is a copolymer mixture of high-pressure polyethylene LDPE (90-100 parts), linear polyethylene LLDPE (150-200 parts), metallocene polyethylene MPE (100-150 parts), and processing aid (1.5-2 parts), and the wavy base layer, the surface layer and the inner layer have better tensile deformation resistance when they are combined with the base layer, and the overall performance is stronger and less likely to tear locally.

[0038] The halogen absorbent is one or a mixture of more than one of zinc stearate, calcium stearate, and synthetic hydrotalcite.

[0039] The polyolefin is one or a mixture of more than one of polypropylene and polyethylene.

[0040] Melt flow rate: 0.2-3.5 ± 0.5 g / 10 min;

[0041] Tensile yield stress ≥ 12-35.0 MPa;

[0042] Flexural modulus ≥ 1400 MPa;

[0043] Yellow index (YI) ≤ 4.0;

[0044] Antibacterial rate ≥ 99%;

[0045] Mildew-proof grade: 0 grade;

[0046] Antiviral activity rate ≥ 99%;

[0047] The polyolefin powder, antioxidant, auxiliary antioxidant, halogen absorbent, and antibacterial agent are mixed in a high-speed mixer for 2-3 min to obtain a mixture, and the mixture is extruded and granulated by a twin-screw extruder to obtain the special material for antibacterial and antiviral express packaging bags.

[0048] The temperature of the twin-screw extruder is controlled at 170-225°C, and the main machine speed is 50-60 revolutions per minute. The specific model and specifications of the twin-screw extruder are not limited here, and can be obtained by purchasing a finished product device on the market.

[0049] The mixer required for stirring can also be obtained by purchasing an existing mixer on the market, and the speed of the mixer can be adjusted and the stirring time can be timed.

[0050] The antioxidant can be a lanthanum antioxidant, which is prepared by the following process: citric acid, N-hydroxyethylenediamine, and lanthanum chloride are weighed according to a molar ratio of 3-4:6-7:3-4, citric acid is added to water, N-hydroxyethylenediamine is added, heated to 95-100°C, stirred and refluxed for 2-3 h, then lanthanum chloride is added, and the reaction is continued for 2 h, then the lanthanum antioxidant is obtained by filtration and drying.

[0051] Step two, the aminated multi-walled carbon nanotubes are added to an epoxy propyl alcohol ethanol solution, constant temperature stirring, after the reaction is completed, the product is washed with ultrapure water, and vacuum dried to obtain multi-hydroxyl carbon nanotubes;

[0052] Step three, the alkyl ketene dimer is added to a four-necked flask with a thermometer, a stirrer and a condenser reflux tube, and is stirred and dissolved in anhydrous ethanol at 60-80℃. After complete dissolution, the multi-hydroxyl carbon nanotubes are added, and the condenser reflux is carried out. After the reaction is completed, the crude product is washed and suction-filtered with 60-70℃ anhydrous ethanol for multiple times, and finally the product is vacuum dried to obtain the alkyl ketene dimer modified carbon nanotubes;

[0053] Step four, the hydroxy acrylic resin and isoflurone diisocyanate curing agent are dissolved in anhydrous ethanol, stirred for 10-15min, and then the alkyl ketene dimer modified carbon nanotubes are added. After stirring for 20-30min, the fluorinated titanium dioxide is added, and the stirring is continued for 1-1.5h to obtain the super-hydrophobic waterproof emulsion by dispersion.

[0054] Step five, the substrate is ultrasonically washed with deionized water and ethanol, and then is naturally dried at 23-27℃. Then, the super-hydrophobic waterproof emulsion is sprayed on the surface layer at an angle of 45° with a nozzle of 1mm at a distance of 15-25cm from the substrate under 2-4kPa. The temperature is controlled at 80-85℃ during spraying, and the surface layer is cured for 2-3h to have the hydrophobic property.

[0055] Example 1: The base layer comprises the following components in the following proportions: polypropylene 50 parts, polyethylene 50 parts, rare earth antioxidant 2-6 parts, ultraviolet absorber 0.5-1.5 parts, phosphogypsum whisker 2-4 parts, nano diatomite 1-3 parts, dispersing agent 1-3 parts, silane coupling agent 1-3 parts, vanillin 1 part, processing aid 5-10 parts, halogen absorber 0.1-1 part. The raw materials are stirred and mixed, heated and melted, and then the base layer is produced by using three-layer co-extrusion upward blowing method. The vanillin bacteriostatic agent is added to inhibit the bacterial reproduction on the packaging bag, and the packaging bag has a certain fragrance.

[0056] Example 2: The base layer comprises the following components in the following proportions: polypropylene 30 parts, polyethylene 70 parts, rare earth antioxidant 2-6 parts, ultraviolet absorber 0.5-1.5 parts, phosphogypsum whisker 2-4 parts, nano diatomite 1-3 parts, dispersing agent 1-3 parts, silane coupling agent 1-3 parts, vanillin and thiazole mixture 1.5 parts in total, processing aid 5-10 parts, halogen absorber 0.1-1 part. The raw materials are stirred and mixed, heated and melted, and then the base layer is produced by using three-layer co-extrusion upward blowing method.

[0057] Example 3: the base layer comprises the following components in the following proportions: polyethylene 150 parts, rare earth antioxidant 2-6 parts, ultraviolet absorber 0.5-1.5 parts, phosphogypsum whisker 2-4 parts, nano diatomite 1-3 parts, dispersing agent 1-3 parts, silane coupling agent 1-3 parts, thiazole and isothiazolone derivative mixture 1.2 parts, processing aid 5-10 parts, halogen absorber 0.1-1 part, the raw materials are stirred and mixed, heated and melted, and then the base layer is produced by using a three-layer co-extrusion upward blowing method.

[0058] Example 4: the base layer comprises the following components in the following proportions: polypropylene 120 parts, rare earth antioxidant 2-6 parts, ultraviolet absorber 0.5-1.5 parts, phosphogypsum whisker 2-4 parts, nano diatomite 1-3 parts, dispersing agent 1-3 parts, silane coupling agent 1-3 parts, zinc oxide 0.8 parts, processing aid 9 parts, halogen absorber 0.1-1 part, the raw materials are stirred and mixed, heated and melted, and then the base layer is produced by using a three-layer co-extrusion upward blowing method.

[0059] Example 5: the base layer comprises the following components in the following proportions: polypropylene 40 parts, polyethylene 70 parts, rare earth antioxidant 2-6 parts, ultraviolet absorber 0.5-1.5 parts, phosphogypsum whisker 2-4 parts, nano diatomite 1-3 parts, dispersing agent 1-3 parts, silane coupling agent 1-3 parts, lithium carbonate 0.9 parts, processing aid 5-10 parts, halogen absorber 0.1-1 part, the raw materials are stirred and mixed, heated and melted, and then the base layer is produced by using a three-layer co-extrusion upward blowing method.

[0060] Example 6: the base layer comprises the following components in the following proportions: polypropylene 40 parts, polyethylene 70 parts, rare earth antioxidant 2-6 parts, ultraviolet absorber 0.5-1.5 parts, phosphogypsum whisker 2-4 parts, nano diatomite 1-3 parts, dispersing agent 1-3 parts, silane coupling agent 1-3 parts, ammonium dihydrogen phosphate 0.5 parts, processing aid 5-10 parts, halogen absorber 0.1-1 part, the raw materials are stirred and mixed, heated and melted, and then the base layer is produced by using a three-layer co-extrusion upward blowing method.

[0061] Example 7: the base layer comprises the following components in the following proportions: polypropylene 80 parts, polyethylene 50 parts, rare earth antioxidant 2-6 parts, ultraviolet absorber 0.5-1.5 parts, phosphogypsum whisker 2-4 parts, nano diatomite 1-3 parts, dispersing agent 1-3 parts, silane coupling agent 1-3 parts, mixture of ammonium dihydrogen phosphate and lithium carbonate 1.4 parts, processing aid 5-10 parts, halogen absorber 0.1-1 part, the raw materials are stirred and mixed, heated and melted, and then the base layer is produced by using a three-layer co-extrusion upward blowing method.

[0062] Example 8: the base layer comprises the following components in the following proportions: polypropylene 100 parts, polyethylene 50 parts, rare earth antioxidant 2-6 parts, ultraviolet absorber 0.5-1.5 parts, phosphogypsum whisker 2-4 parts, nano diatomite 1-3 parts, dispersing agent 1-3 parts, silane coupling agent 1-3 parts, ammonium dihydrogen phosphate 1.1 parts, processing aid 5-10 parts, halogen absorber 0.1-1 parts, the raw materials are stirred and mixed, heated and melted, and then the base layer is produced by using a three-layer co-extrusion top blowing method

[0063] Example 9: the base layer comprises the following components in the following proportions: polypropylene 90 parts, polyethylene 75 parts, rare earth antioxidant 2-6 parts, ultraviolet absorber 0.5-1.5 parts, phosphogypsum whisker 2-4 parts, nano diatomite 1-3 parts, dispersing agent 1-3 parts, silane coupling agent 1-3 parts, ammonium dihydrogen phosphate 1.4 parts, processing aid 5-10 parts, halogen absorber 0.1-1 parts, the raw materials are stirred and mixed, heated and melted, and then the base layer is produced by using a three-layer co-extrusion top blowing method

[0064] The working principle of the present application comprises the following steps:

[0065] First step: the automatic batching system respectively configures the three layers of the extruder according to the proportions, and respectively transports to the plasticizing extrusion of each extruder;

[0066] Second step: using a three-layer co-extrusion film blowing machine head mold to form, controlling the distance between the dew point line in the mold forming process and the head die port to be 26mm-320mm, the blowing ratio to be 1.8-2.8, and the wind ring cooling after forming;

[0067] Third step: after cooling, rotating traction is performed, and the traction ratio is controlled to be 3.0-4.7;

[0068] Fourth step: corona treatment and winding are performed to obtain the finished base layer film;

[0069] Fifth step: the surface layer and the base layer are compounded, and then the inner layer is bonded on the other side of the base layer to obtain a composite layer;

[0070] Sixth step: the composite layer film is cut and hot pressed to form an open packaging bag, and a double-sided tape is bonded at the bag opening to obtain a packaging bag.

[0071] In the above steps, the temperature of the head die port is 180-210±5℃, the preferred middle blowing ratio is 1.8-2.5, and the preferred middle traction ratio is 3.8-4.7.

[0072] In the mold forming process, the distance of the dew point line is controlled to be 300mm-320mm, the dew point line is a transparent and fuzzy boundary line on the bubble, the height of the dew point line influences the performance of the blown film, if the dew point line is too high, the blowing is completed in liquid state, the blown film produced has uniform performance, the subsequent shrinkage is small, but if the dew point line is too high, the bubble is unstable, the width and thickness deviation is large; on the contrary, if the dew point line is too low, the blowing of the bubble is carried out in solid high elastic state, the blown film produced has performance closer to the oriented film, the heat lamination performance is poor, therefore, the distance between the dew point line and the die port of the head is controlled to be 300-320mm in the application, so that the width and thickness of the film produced are more suitable, the film performance is more stable and uniform, and the heat lamination performance is good

[0073] The basic principles and main features of the present application and the advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above examples, the above examples and the description in the specification are only to illustrate the principles of the present application, various changes and improvements can be made to the present application without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A polyolefin bag characterized by comprising: The package bag body is composed of a composite layer, which comprises a base layer, a surface layer and an inner layer on both sides of the base layer, and the base layer, the surface layer and the inner layer are pressed and formed, and the base layer is polyolefin. The base layer comprises the following components in the following proportions: 80-100 parts of polyolefin powder, 2-6 parts of rare earth antioxidant, 0.5-1.5 parts of ultraviolet absorber, 2-4 parts of phosphogypsum whisker, 1-3 parts of nano diatomite, 1-3 parts of dispersing agent, 1-3 parts of silane coupling agent, 1-1.5 parts of antibacterial agent, 5-10 parts of processing aid, and 0.1-1 part of halogen absorber. The antibacterial agent is one or a mixture of more than one of vanillin, thiazole, isothiazolone derivative, imidazole, polyhexamethylene guanidine hydrochloride, zinc oxide, copper oxide, ammonium dihydrogen phosphate, and lithium carbonate. The processing aid is PPA containing 5% organic fluorine compound, and the organic fluorine compound is a copolymer of fluoroalkene or a copolymer of fluoroalkene and other olefins. The phosphogypsum whisker has a particle size of 0.5-5 μm, and the dispersing agent is polyethylene wax. The base layer is in a wave shape, and the surface layer is a copolymer mixture of high-pressure polyethylene LDPE (90-100 parts), linear polyethylene LLDPE (150-200 parts), metallocene polyethylene MPE (100-150 parts), and processing aid (1.5-2 parts). The top surface and the bottom surface of the base layer are coated with glue, the glue is polyolefin, and the surface layer and the inner layer are pressed with the glue to form a composite layer, wherein the top of the surface layer is also laid with a release film. The release film is polyolefin. The halogen absorber is one or a mixture of more than one of zinc stearate, calcium stearate, and synthetic hydrotalcite.

2. The polyolefin bag of claim 1, wherein: The polyolefin is one or a mixture of more than one of polypropylene and polyethylene.

3. The polyolefin bag of claim 1, wherein: ​

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