CN110539538B - Cast CPE (chlorinated polyethylene) inflatable automatic packaging composite film and preparation method thereof - Google Patents
Cast CPE (chlorinated polyethylene) inflatable automatic packaging composite film and preparation method thereof Download PDFInfo
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- B32B27/00—Layered products comprising a layer of synthetic resin
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- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
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Abstract
The invention discloses a curtain coating CPE (chlorinated polyethylene) inflatable automatic packaging composite film and a preparation method thereof. The cast CPE inflation automatic packaging composite film comprises a corona layer, a middle layer and a heat sealing layer which are connected in sequence; the corona layer comprises the following components in parts by weight: 78-82 parts of LLDPE, 2.8-3.2 parts of MPE, 8-12 parts of LDPE, 5.5-6.5 parts of HDPE and 0.8-1.2 parts of a mouth-opening slipping agent; the middle layer is LLDPE; the heat sealing layer comprises the following components in parts by weight: 45-55 parts of MPE, 8-12% of LDPE, 8-12 parts of POE, 23-27 parts of LLPDE, 1.8-2.2 parts of processing aid and 2.8-3.2 parts of modified heat seal material. The cast CPE inflation automatic packaging composite film has the advantages of high friction coefficient and good transparency.
Description
Technical Field
The invention relates to the technical field of packaging films, in particular to a cast CPE (chlorinated polyethylene) inflatable automatic packaging composite film and a preparation method thereof.
Background
With the rapid development of economy, unprecedented development opportunities are brought to the flexible package industry. The demand for films as an important base material in flexible packaging is growing dramatically each year. The CPP, as a large body of the heat sealing material, has advantages of high glossiness, good heat resistance, high strength, etc. as compared with polyethylene.
However, most of CPP films are opaque, and some packages need to have a transparent property with the increase of market requirements, so that the CPE films are gradually emerging, and the CPE films are mainly films made of oxidized polyethylene, and the CPP films have the characteristics of light weight, high transparency, strong mechanical adaptability, moisture resistance and the like.
Since the coefficient of friction is an important index for inspecting the packaging film, the frictional force during the packaging process is often both dynamic and resistive, and therefore the magnitude thereof should be controlled within a proper range. The CPE gas-filled packaging film is divided into a high friction film and a low friction film, the high friction coefficient is generally between 0.6 and 0.9, the low friction coefficient is generally between 0.15 and 0.25, the low friction coefficient ensures that the CPE gas-filled packaging film does not have good anti-skidding performance, and the CPE gas-filled packaging film is easy to slip off when packaging baked products, so that the appearance of the products is damaged.
Disclosure of Invention
Aiming at the defects in the prior art, the first object of the invention is to provide a cast CPE inflation automatic packaging composite film which has the advantages of high friction coefficient and good transparency.
The second purpose of the invention is to provide a preparation method of the cast CPE inflation automatic packaging composite film, which has the advantages of simple preparation method and easy operation.
In order to achieve the first object, the invention provides the following technical scheme: a curtain coating CPE aerifys automatic packaging composite film, including corona layer, intermediate level and heat-seal layer connected sequentially;
the corona layer comprises the following components in parts by weight: 78-82 parts of LLDPE, 2.8-3.2 parts of MPE, 8-12 parts of LDPE, 5.5-6.5 parts of HDPE and 0.8-1.2 parts of opening slipping agent, wherein the middle layer is LLDPE;
the heat sealing layer comprises the following components in parts by weight: 45-55 parts of MPE, 8-12% of LDPE, 8-12 parts of POE, 23-27 parts of LLPDE, 1.8-2.2 parts of processing aid and 2.8-3.2 parts of modified heat seal material.
By adopting the technical scheme, as the LLDPE, the MPE, the LDPE, the HDPE and the opening slipping agent are used for preparing the corona layer, the MPE has good opening performance and strong printability, so that the mechanical property of the corona layer is high, the LLDPE for preparing the middle layer has stronger tensile, penetration-resistant, impact-resistant and tear-resistant properties, the flexibility is good, the puncture resistance is strong, the POE in the heat-sealing layer has excellent toughness and good processability, the processing fluidity of a polymer and the transparency of a material can be improved, the impact-resistant property of the heat-sealing layer is improved while the heat-sealing layer is toughened, and a packaging film structure consisting of the corona layer, the middle layer and the heat-sealing layer has the advantages of high transparency and large friction coefficient.
Further, the corona layer, the middle layer and the heat sealing layer are sequentially connected;
the corona layer comprises the following components in parts by weight: 79 to 81 portions of LLDPE, 2.9 to 3.1 portions of MPE, 9 to 11 portions of LDPE, 5.8 to 6.3 portions of HDPE and 0.9 to 1.1 portions of opening slipping agent;
the middle layer is LLDPE;
the heat sealing layer comprises the following components in parts by weight: 48-53 parts of MPE, 9-11% of LDPE, 9-11 parts of POE, 24-26 parts of LLPDE, 1.9-2.1 parts of processing aid and 2.9-3.1 parts of modified heat seal material.
By adopting the technical scheme, the materials of all layers are more accurate, so that the prepared CPE automatic packaging film has higher transparency and higher friction coefficient.
Further, the modified heat seal material is prepared by the following method: dissolving 1-3 parts by weight of polyurethane particles by using 3-5 parts by weight of dimethylformamide, adding 0.5-0.8 part by weight of toluene, N-dimethylaniline and 1-3 parts by weight of acrylic acid, uniformly mixing, adding 0.8-1.2 parts by weight of hollow glass microspheres, 0.6-1 part by weight of nano magnesium oxide and 1.4-1.8 parts by weight of nano titanium dioxide, uniformly mixing, and extruding and granulating.
By adopting the technical scheme, after the polyurethane particles are dissolved, the hollow glass beads, the nano magnesium oxide and the nano titanium dioxide are added to enhance the friction coefficient and the antibacterial property of the middle layer.
Further, the LLDPE in the corona layer has a melt index of 20g/10min and a density of 0.924g/cm3, the LDPE has a melt index of 1.9g/10min and a density of 0.924g/cm3The HDPE had a melt index of 7.34g/10min and a density of 956.1kg/m3；
The LLDPE in the middle layer has the melt index of 2.0g/10min and the density of 0.918g/cm3；
The melt index of LDPE in the heat-sealing layer is 1.9g/10min, and the density is 0.925g/cm3The LLDPE has a melt index of 2.0g/10min and a density of 0.918g/cm3。
Further, the thickness ratio of the corona layer to the intermediate layer to the heat-sealing layer is 5:2-3: 2-3.
By adopting the technical scheme, the CPE automatic packaging film has high transparency, large friction coefficient and good tensile property.
Further, the intermediate layer also comprises a long-acting antibacterial agent and a barrier agent, and the mass ratio of the long-acting antibacterial agent and the barrier agent to the LLDPE is 0-2:0-2: 96-100.
By adopting the technical scheme, the long-acting antibacterial agent and the barrier agent are added in the middle layer, and the antibacterial agent and the barrier agent have synergistic effect, so that the antibacterial and barrier properties of the CPE automatic packaging film can be enhanced, and the quality guarantee period of the product is prolonged.
Further, the long-acting antibacterial agent is prepared by the following method: putting 1-1.5 parts by weight of nano copper powder into 2-4 parts by weight of ethanol solution, performing ultrasonic treatment at 25-30 ℃ for 15-20min, adding 0.5-1 part by weight of ammonia water, performing ultrasonic treatment for 3min, heating to 35 ℃, stirring at high speed for 7-8h, adding 1.5-2.5 parts by weight of ethyl orthosilicate, sealing, cooling, centrifuging, and drying to obtain the long-acting antibacterial agent.
By adopting the technical scheme, the tetraethoxysilane is decomposed into the silicon dioxide, the silicon dioxide can wrap the nano copper powder, the antibacterial effect of the silicon dioxide is strong, and the nano same root has a good inhibition effect on staphylococcus aureus, escherichia coli, candida albicans and the like.
Further, the blocking agent is prepared by mixing LCP, PET and PVDC according to the mass ratio of 1:0.4-0.7:1.2-1.5, extruding and granulating.
By adopting the technical scheme, the PVDC has better barrier property to micromolecule water vapor, liquid, fragrance and gas, the PET has the advantages of impact resistance, high pressure resistance, good transparency and high glossiness, when the PVDC is mixed with the PVDC, the defects that the barrier property of the PET is poor, packing materials are easy to rot and deteriorate due to the entering of oxygen and the overflowing of carbon dioxide can be overcome, the LCP has good weather resistance and corrosion resistance, has excellent barrier property, and can effectively prevent the oxygen, the water vapor, the carbon dioxide, the flavor and the fragrance from overflowing.
In order to achieve the second object, the invention provides the following technical scheme: a preparation method of a cast CPE inflation automatic packaging composite film comprises the following steps:
s1, pouring the raw materials required by the corona layer, the middle layer and the heat sealing layer into three stirrers respectively according to the proportion, stirring for 15-20min, adding into an extruder after stirring, and carrying out tape casting extrusion, wherein the interlayer ratio of each layer of film is carried out according to the thickness ratio of the corona layer to the middle layer to the heat sealing layer of 5:2-3: 2-3;
s2, passing each extruded film through a cooling roller with the water temperature of 33-37 ℃, wherein the rotating speed of a vacuum machine is 1250-;
s3, setting the thickness of the thickness gauge at 60MICO, setting the standard deviation at 3%, and starting an automatic die head to adjust the thickness of the film by online PID;
s4, corona treatment is carried out on the middle corona layer of the heat-seal easy-to-tear cover film by a corona machine, and the corona value reaches the effect of 40 dyne value;
s5, rolling the casting CPE inflation automatic packaging composite film, placing the rolled coiled material on an aging rack, and placing for 46-50 h;
and S6, cutting the aged coiled material according to the width of the coiled material, and packaging and warehousing the cut coiled material.
In conclusion, the invention has the following beneficial effects:
firstly, because the corona layer is prepared by blending MPE, LLDPE, LDPE and HDPE, the LLDPE and the MPE have excellent processing performance, higher impact strength, good rigidity and excellent heat sealing performance, the middle layer has high tensile strength and strong impact resistance, POE in the heat sealing layer has excellent toughness and good processing performance, the processing fluidity of the polymer and the transparency of the material can be improved, and the three-layer composite packaging film has stronger friction coefficient and transparency.
Secondly, the long-acting antibacterial agent and the blocking agent are preferably doped into the middle layer, and the CPE automatic packaging film needs to have better antibacterial property and blocking property when packaging food, so that the antibacterial property and the blocking property of the packaging film can be effectively improved by adding the long-acting antibacterial agent and the blocking agent, and the quality guarantee period of the packaged product is prolonged.
And thirdly, the polyurethane particles, the hollow glass beads, the nano magnesium oxide and the nano titanium dioxide are preferably used for preparing the modified heat sealing material, and the hollow glass beads, the nano magnesium oxide and the nano titanium dioxide can enhance the friction coefficient and the antibacterial performance of the packaging film, so that the packaging film has better packaging performance when packaging baked food, and the shelf life of the product is prolonged.
And fourthly, the nanometer copper powder is coated by the silicon dioxide, so that the antibacterial property and the antibacterial durability of the packaging film are enhanced, and the LCP, the PET and the PVDC are mixed to prepare the blocking agent, so that the packaging film can effectively prevent oxygen, water vapor, carbon dioxide, flavor and aroma from overflowing.
Drawings
Fig. 1 is a schematic structural view of a cast CPE air-filled self-wrapping composite film provided in example 1 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples.
Preparation examples 1 to 3 of Heat-seal modifiers
The polyurethane particles in preparation examples 1-3 are selected from 85A polyurethane particles sold by Shenzhen Qin assist plastics Co., Ltd, the hollow glass beads are selected from VA5500 hollow glass beads sold by Shanghai Muchun Feng construction science Co., Ltd, the nano magnesium oxide is selected from KR-MgO nano magnesium oxide sold by Anhui Ke nanometer science Co., Ltd, and the nano titanium dioxide is selected from CY-T25F nano titanium dioxide sold by Hangzhou Jiufan New Material Co., Ltd.
Preparation example 1: dissolving 1kg of polyurethane particles by using 3kg of dimethylformamide, adding 0.5kg of toluene, N-dimethylaniline and 1kg of acrylic acid, uniformly mixing, adding 0.8kg of hollow glass microspheres, 0.6kg of nano magnesium oxide and 1.4kg of nano titanium dioxide, uniformly mixing, and extruding and granulating.
Preparation example 2: dissolving 2kg of polyurethane particles by using 4kg of dimethylformamide, adding 0.6kg of toluene, N-dimethylaniline and 2kg of acrylic acid, uniformly mixing, adding 1kg of hollow glass microspheres, 0.8kg of nano magnesium oxide and 1.6kg of nano titanium dioxide, uniformly mixing, extruding and granulating.
Preparation example 3: dissolving 3kg of polyurethane particles by using 5kg of dimethylformamide, adding 0.8kg of toluene, N-dimethylaniline and 3kg of acrylic acid, uniformly mixing, adding 1.2kg of hollow glass microspheres, 1kg of nano magnesium oxide and 1.8kg of nano titanium dioxide, uniformly mixing, extruding and granulating.
Preparation examples 4 to 6 of Long-acting antibacterial agent
The nano copper powder in preparation examples 4-6 is selected from nano copper powder sold by Kangshuo welding materials, Inc. of Qinghe county under the brand number KS, and the tetraethoxysilane is selected from tetraethoxysilane sold by Wuxi Audrencheng chemical industries, Inc. under the brand number ADC-68.
Preparation example 4: putting 1kg of nano copper powder into 2kg of ethanol solution, performing ultrasonic treatment at 25 ℃ for 15min, adding 0.5kg of ammonia water, performing ultrasonic treatment for 3min, heating to 35 ℃, stirring at high speed for 7h, adding 1.5kg of ethyl orthosilicate, sealing, cooling, centrifuging, and drying to obtain the long-acting antibacterial agent.
Preparation example 5: putting 1.3kg of nano copper powder into 3kg of ethanol solution, performing ultrasonic treatment at 28 ℃ for 18min, adding 0.8kg of ammonia water, performing ultrasonic treatment for 3min, heating to 35 ℃, stirring at high speed for 7.5h, adding 2kg of ethyl orthosilicate, sealing, cooling, centrifuging, and drying to obtain the long-acting antibacterial agent.
Preparation example 6: putting 1.5kg of nano copper powder into 4kg of ethanol solution, performing ultrasonic treatment at 30 ℃ for 20min, adding 1kg of ammonia water, performing ultrasonic treatment for 3min, heating to 35 ℃, stirring at high speed for 8h, adding 2.5kg of ethyl orthosilicate, sealing, cooling, centrifuging, and drying to obtain the long-acting antibacterial agent.
Examples
Examples 1-8 wherein the corona layer 1 is selected from LLDPE from DF7042 sold by Fujian Unipetrochemicals, LDPE is selected from Shell 2420H, MPE is selected from Exxon 3518CB, HDPE is selected from Fujian Unipetrochemicals 8008, the shedding slip agent is selected from Wallace SAB-8608, the middle layer 2 is selected from LLDPE from Exxon 1002BU, the heat seal layer 3MPE is selected from Exxon 3518CB, LDPE is selected from Shell 2426H, LLDPE is selected from Exxon 1002BU, POE is selected from Exxon FL3980, LCP is selected from Santa Kobona ZE55 55205BK, PET is selected from Guikon plastic feedstock, part number A206300, and PVDC is selected from Santa Dow 506.
Example 1: a preparation method of a cast CPE inflation automatic packaging composite film comprises the following steps:
s1, respectively pouring the raw materials required by the corona layer 1, the intermediate layer 2 and the heat sealing layer 3 into three stirrers according to the proportion, stirring for 15min, adding into an extruder after stirring, carrying out tape casting extrusion, wherein the temperature of the extruder of each layer is shown in the table 2, and the interlayer ratio of each layer is carried out according to the thickness ratio of the corona layer 1 to the intermediate layer 2 to the heat sealing layer 3 of 5:2: 3;
wherein the raw materials and the dosages of the corona layer 1, the intermediate layer 2 and the heat-sealing layer 3 are shown in Table 1, the melt index of LLDPE in the corona layer 1 is 20g/10min, and the density is 0.924g/cm3The LDPE has a melt index of 1.9g/10min and a density of 0.924g/cm3The HDPE had a melt index of 7.34g/10min and a density of 956.1kg/m3(ii) a The LLDPE in the intermediate layer 2 has a melt index of 2.0g/10min and a density of 0.918g/cm3(ii) a The LDPE in the heat-sealing layer has the melt index of 1.9g/10min and the density of 0.925g/cm3The LLDPE has a melt index of 2.0g/10min and a density of 0.918g/cm3The processing aid is a plasticizer and a compatilizer in a mass ratio of 1:1, the plasticizer is propylene glycol, the compatilizer is acrylic acid, and the modified heat sealing material is prepared from preparation example 1;
s2, passing each extruded film through a cooling roller with the water temperature of 33 ℃, wherein the rotating speed of a vacuum machine is 1250 r/min;
s3, setting the thickness of the thickness gauge at 60MICO, setting the standard deviation at 3%, and starting an automatic die head to adjust the thickness of the film by online PID;
s4, carrying out corona treatment on the middle corona layer 1 of the heat-seal easy-to-tear cover film by using a corona machine, wherein the corona value reaches 40 dyne value effect;
s5, rolling the casting CPE inflation automatic packaging composite film, wherein the number of rolled meters is 8000 m, and placing the rolled coiled material on an aging rack for 46 h;
and S6, cutting the aged coiled material according to the width of the coiled material, and packaging and warehousing the cut coiled material.
Table 1 raw material ratios of cast CPE inflated autowrapping composite films in examples 1-8
Table 2 extruder temperatures for corona layer 1, intermediate layer 2 and heat seal layer 3 in example 1
Example 2: a preparation method of a cast CPE inflation automatic packaging composite film comprises the following steps:
s1, respectively pouring the raw materials required by the corona layer 1, the intermediate layer 2 and the heat sealing layer 3 into three stirrers according to the proportion, stirring for 15min, adding into an extruder after stirring, carrying out tape casting extrusion, wherein the temperature of the extruder of each layer is shown in the table 3, and the interlayer ratio of each layer is carried out according to the thickness ratio of the corona layer 1 to the intermediate layer 2 to the heat sealing layer 3 of 5:2.5: 2.5;
wherein the raw materials and the dosages of the corona layer 1, the intermediate layer 2 and the heat-sealing layer 3 are shown in Table 1, the melt index of LLDPE in the corona layer 1 is 20g/10min, and the density is 0.924g/cm3The LDPE has a melt index of 1.9g/10min and a density of 0.924g/cm3The HDPE had a melt index of 7.34g/10min and a density of 956.1kg/m3(ii) a The LLDPE in the intermediate layer 2 has a melt index of 2.0g/10min and a density of 0.918g/cm3(ii) a The LDPE in the heat-sealing layer has the melt index of 1.9g/10min and the density of 0.925g/cm3The LLDPE has a melt index of 2.0g/10min and a density of 0.918g/cm3The processing aid is a compatilizer and a cross-linking agent in a mass ratio of 1:1, the compatilizer is methacrylic acid, the cross-linking agent is borax, and the modified heat sealing material is prepared by preparation example 2Forming;
s2, passing each extruded film through a cooling roller with the water temperature of 35 ℃, wherein the rotating speed of a vacuum machine is 1280 r/min;
s3, setting the thickness of the thickness gauge at 60MICO, setting the standard deviation at 3%, and starting an automatic die head to adjust the thickness of the film by online PID;
s4, carrying out corona treatment on the middle corona layer 1 of the heat-seal easy-to-tear cover film by using a corona machine, wherein the corona value reaches 40 dyne value effect;
s5, rolling the casting CPE inflation automatic packaging composite film, wherein the number of rolled meters is 8000 m, and placing the rolled coiled material on an aging rack for 48 h;
and S6, cutting the aged coiled material according to the width of the coiled material, and packaging and warehousing the cut coiled material.
Table 3 extruder temperatures for corona layer 1, intermediate layer 2 and heat seal layer 3 in example 2
Example 3: a preparation method of a cast CPE inflation automatic packaging composite film comprises the following steps:
s1, respectively pouring the raw materials required by the corona layer 1, the intermediate layer 2 and the heat sealing layer 3 into three stirrers according to the proportion, stirring for 15min, adding into an extruder after stirring, carrying out tape casting extrusion, wherein the temperature of the extruder of each layer is shown in a table 4, and the interlayer ratio of each layer is carried out according to the thickness ratio of the corona layer 1 to the intermediate layer 2 to the heat sealing layer 3 of 5:3: 2;
wherein the raw materials and the dosages of the corona layer 1, the intermediate layer 2 and the heat-sealing layer 3 are shown in Table 1, the melt index of LLDPE in the corona layer 1 is 20g/10min, and the density is 0.924g/cm3The LDPE has a melt index of 1.9g/10min and a density of 0.924g/cm3The HDPE had a melt index of 7.34g/10min and a density of 956.1kg/m3(ii) a The LLDPE in the intermediate layer 2 has a melt index of 2.0g/10min and a density of 0.918g/cm3(ii) a The LDPE in the heat-sealing layer has the melt index of 1.9g/10min and the density of 0.925g/cm3The LLDPE has a melt index of 2.0g/10min and a density of 0.918g/cm3The modified heat sealing material is prepared by preparation example 3, wherein the processing aid is a plasticizer and a cross-linking agent in a mass ratio of 1:1, the plasticizer is dibutyl phthalate, and the cross-linking agent is formaldehyde;
s2, passing each extruded film through a cooling roller with the water temperature of 37 ℃, wherein the rotating speed of a vacuum machine is 1300 r/min;
s3, setting the thickness of the thickness gauge at 60MICO, setting the standard deviation at 3%, and starting an automatic die head to adjust the thickness of the film by online PID;
s4, carrying out corona treatment on the middle corona layer 1 of the heat-seal easy-to-tear cover film by using a corona machine, wherein the corona value reaches 40 dyne value effect;
s5, rolling the casting CPE inflation automatic packaging composite film, wherein the number of rolled meters is 8000 m, and placing the rolled coiled material on an aging rack for 50 h;
and S6, cutting the aged coiled material according to the width of the coiled material, and packaging and warehousing the cut coiled material.
Table 4 extruder temperatures for corona layer 1, intermediate layer 2 and heat seal layer 3 in example 3
Examples 4 to 5: a method of making a cast CPE inflated self-wrapping composite film, differing from example 1 in that the raw material formulations of corona layer 1, intermediate layer 2 and heat-seal layer 3 are shown in table 1.
Example 6: the difference between the preparation method of the cast CPE inflation automatic packaging composite film and the embodiment 1 is that the middle layer further comprises 1kg of long-acting antibacterial agent and 1kg of barrier agent, the long-acting antibacterial agent is prepared by the preparation example 4, and the barrier agent is prepared by mixing LCP, PET and PVDC according to the mass ratio of 1:0.4:1.2, extruding and granulating.
Example 7: the difference between the preparation method of the cast CPE inflation automatic packaging composite film and the embodiment 1 is that the middle layer further comprises 1.5kg of long-acting antibacterial agent and 1.5kg of barrier agent, the long-acting antibacterial agent is prepared by the preparation example 5, and the barrier agent is prepared by mixing LCP, PET and PVDC according to the mass ratio of 1:0.5:1.3, extruding and granulating.
Example 8: the difference between the preparation method of the cast CPE inflation automatic packaging composite film and the embodiment 1 is that the middle layer further comprises 2kg of long-acting antibacterial agent and 2kg of barrier agent, the long-acting antibacterial agent is prepared by the preparation example 6, and the barrier agent is prepared by mixing LCP, PET and PVDC according to the mass ratio of 1:0.7:1.5, extruding and granulating.
Performance detection test one, physical performance detection: CPE inflation automatic packaging composite films were prepared according to the methods of examples 1-5, comparative example 1 was selected from CPE food packaging films sold by plastic technology ltd, engendered in cloudy days, and the various properties of the CPE packaging films were tested according to the following test methods and the test results are reported in table 5:
1. transparency: detecting according to GB/T2410-1980 transparent plastic light transmittance and haze test method;
2. tensile strength and elongation at break: detecting according to GB/T13022-1991 'Plastic film tensile property test method';
3. coefficient of friction: detecting according to GB/T10068-1988, namely a method for measuring friction coefficients of plastics and sheets;
4. corona value: detection was performed with a 38 dyne pen;
5. pant-type tear strength: detecting according to GB/T16578 tear resistance test method-trouser tear method for plastic film and thin sheet;
6. heat seal strength: and covering a PET film on the original CPE film by using a five-point heat sealing instrument, carrying out heat sealing twice, and detecting according to GB/T2358-1998 'Plastic film packaging heat sealing strength test method'.
TABLE 5 Performance testing of cast CPE inflated automatic packaging composite films
As can be seen from the data in table 5, the heat-sealing layer 3 of the CPE automatic packaging films prepared by the methods in examples 1-5 has a friction coefficient of 0.75/1.21, meets the requirements of high-friction-coefficient packaging films, and has high transparency, high tensile strength, high elongation at break, and strong mechanical properties.
Comparative example 1 is a prior art CPE packaging film having a low coefficient of friction and not as mechanically as the CPE packaging films prepared in examples 1-5.
Secondly, detecting antibacterial performance and barrier performance: CPE packaging films were prepared according to the methods of examples 6-8 and comparative example 1, and the barrier property and antibacterial property of the CPE packaging films were measured according to the following methods, and the measurement results are reported in table 6.
1. Water vapor transmission rate: detecting according to GB/T1037-1988 cup method for testing water vapor permeability of plastic films and sheets;
2. oxygen transmission amount: detecting according to GB/T1038-2000 pressure difference method for testing gas permeability of plastic sheets and sheets;
3. antibacterial property: GB/T31402-2015 test method for antibacterial property of plastic surface.
Table 6 detection of barrier and antimicrobial properties of CPE packaging films prepared in examples 6-8 and comparative example 1
As can be seen from the data in table 6, since the CPE films of examples 6-8 incorporate the long-acting antibacterial agent and the blocking agent on the basis of the raw material of example 1, the CPE packaging films prepared by examples 6-8 have low permeability to water vapor and oxygen, have good blocking performance, have good inhibition to escherichia coli, staphylococcus aureus and candida albicans, have high antibacterial rate, and can effectively prevent food from mildewing in food packaging.
The CPE food packaging film prepared in comparative example 1 was inferior in barrier properties against water vapor and oxygen to the CPE packaging films prepared in examples 6-8, and had low antibacterial properties and poor mold-proof effects.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (9)
1. The cast CPE inflation automatic packaging composite film is characterized by comprising a corona layer, a middle layer and a heat sealing layer which are sequentially connected;
the corona layer comprises the following components in parts by weight: 78-82 parts of LLDPE, 2.8-3.2 parts of MPE, 8-12 parts of LDPE, 5.5-6.5 parts of HDPE and 0.8-1.2 parts of a mouth-opening slipping agent;
the middle layer is LLDPE;
the heat sealing layer comprises the following components in parts by weight: 45-55 parts of MPE, 8-12 parts of LDPE, 8-12 parts of POE, 23-27 parts of LLPDE, 1.8-2.2 parts of processing aid and 2.8-3.2 parts of modified heat seal material;
the modified heat seal material is prepared by the following method: dissolving 1-3 parts by weight of polyurethane particles by using 3-5 parts by weight of dimethylformamide, adding 0.5-0.8 part by weight of toluene, N-dimethylaniline and 1-3 parts by weight of acrylic acid, uniformly mixing, adding 0.8-1.2 parts by weight of hollow glass microspheres, 0.6-1 part by weight of nano magnesium oxide and 1.4-1.8 parts by weight of nano titanium dioxide, uniformly mixing, and extruding and granulating.
2. A cast CPE air-filled self-wrapping composite film as recited in claim 1, comprising a corona layer, an intermediate layer and a heat-seal layer connected in sequence;
the corona layer comprises the following components in parts by weight: 79 to 81 portions of LLDPE, 2.9 to 3.1 portions of MPE, 9 to 11 portions of LDPE, 5.8 to 6.3 portions of HDPE and 0.9 to 1.1 portions of opening slipping agent;
the middle layer is LLDPE;
the heat sealing layer comprises the following components in parts by weight: 48-53 parts of MPE, 9-11 parts of LDPE, 9-11 parts of POE, 24-26 parts of LLPDE, 1.9-2.1 parts of processing aid and 2.9-3.1 parts of modified heat seal material.
3. A cast CPE air-filled autopackaging composite film according to any of claims 1-2, wherein the LLDPE in the corona layer has a melt index of 20g/10min and a density of 0.924g/cm3The LDPE has a melt index of 1.9g/10min and a density of 0.924g/cm3The HDPE had a melt index of 7.34g/10min and a density of 956.1kg/m3；
The LLDPE in the middle layer has the melt index of 2.0g/10min and the density of 0.918g/cm3；
The melt index of LDPE in the heat-sealing layer is 1.9g/10min, and the density is 0.925g/cm3The LLDPE has a melt index of 2.0g/10min and a density of 0.918g/cm3。
4. A cast CPE inflated self-wrapping composite film according to any of claims 1-2, wherein the processing aid is one or a mixture of plasticizers, compatibilizers, cross-linking agents;
the plasticizer is polyhydric alcohol or dibutyl phthalate;
the compatilizer is one or more of acrylic acid, methacrylic acid and maleic anhydride;
the cross-linking agent is one or more of borax, formaldehyde, dicumyl peroxide and benzoyl peroxide.
5. A cast CPE air-filled self-wrapping composite film according to any of claims 1-2, characterized in that the thickness ratio of the corona layer (1), intermediate layer (2) and heat-seal layer (3) is 5:2-3: 2-3.
6. A cast CPE inflation self-wrapping composite film as claimed in claim 1, wherein the intermediate layer further comprises a long-acting antimicrobial and a barrier agent, the mass ratio of the long-acting antimicrobial and barrier agent to the LLDPE being 1-2:1-2: 97-98.
7. A cast CPE air-filled self-wrapping composite film as recited in claim 6, wherein the long-acting antimicrobial is made by a process comprising: putting 1-1.5 parts by weight of nano copper powder into 2-4 parts by weight of ethanol solution, performing ultrasonic treatment at 25-30 ℃ for 15-20min, adding 0.5-1 part by weight of ammonia water, performing ultrasonic treatment for 3min, heating to 35 ℃, stirring at high speed for 7-8h, adding 1.5-2.5 parts by weight of ethyl orthosilicate, sealing, cooling, centrifuging, and drying to obtain the long-acting antibacterial agent.
8. A cast CPE air-filled self-wrapping composite film according to claim 7, wherein the barrier agent is prepared by LCP, PET and PVDC mixed according to the mass ratio of 1:0.4-0.7:1.2-1.5 and extruded and pelletized.
9. A method of making a cast CPE air-filled self-wrapping composite film according to any one of claims 1-8, comprising the steps of:
s1, respectively pouring the raw materials required by the corona layer (1), the intermediate layer (2) and the heat sealing layer (3) into three stirrers according to the proportion, stirring for 15-20min, adding into an extruder after stirring, and carrying out tape casting extrusion, wherein the interlayer ratio of each layer of film is carried out according to the thickness ratio of the corona layer (1), the intermediate layer (2) and the heat sealing layer (3) of 5:2-3: 2-3;
s2, passing each extruded film through a cooling roller with the water temperature of 33-37 ℃, wherein the rotating speed of a vacuum machine is 1250-;
s3, setting the thickness of the thickness gauge at 60MICO, setting the standard deviation at 3%, and starting an automatic die head to adjust the thickness of the film by online PID;
s4, corona treatment is carried out on a corona layer (1) in the casting CPE inflation self-filling packaging composite film by a corona machine, and the corona value reaches the effect of 40 dyne value;
s5, rolling the casting CPE inflation automatic packaging composite film, placing the rolled coiled material on an aging rack, and placing for 46-50 h;
and S6, cutting the aged coiled material according to the width of the coiled material, and packaging and warehousing the cut coiled material.
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| CN110978705A (en) * | 2019-12-18 | 2020-04-10 | 江苏普雷特塑料包装有限公司 | High-strength anti-slip packaging bag and preparation method thereof |
| CN112194839A (en) * | 2020-09-18 | 2021-01-08 | 中天（中国）工业有限公司 | High-strength PE cast film and preparation method thereof |
| CN112356543B (en) * | 2020-10-28 | 2023-04-28 | 中国石油化工股份有限公司 | High-gloss high-transparency polyethylene casting film and preparation method thereof |
| CN113829707B (en) * | 2021-08-11 | 2023-09-19 | 黄山永新股份有限公司 | High-barrier anti-slip packaging film and preparation method thereof |
| CN113650955A (en) * | 2021-08-23 | 2021-11-16 | 无锡市新浩保护膜有限公司 | Continuous automatic sealing and packaging film and production method and packaging method thereof |
| CN116922914B (en) * | 2023-07-24 | 2024-04-05 | 青岛伟东包装有限公司 | High-gloss low-haze plastic film and preparation method thereof |
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