CN114805975A - Composition of blow molding film for packaging, preparation method of blow molding film and blow molding film - Google Patents
Composition of blow molding film for packaging, preparation method of blow molding film and blow molding film Download PDFInfo
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- 239000000203 mixture Substances 0.000 title claims abstract description 50
- 238000004806 packaging method and process Methods 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title abstract description 3
- 238000000071 blow moulding Methods 0.000 title description 13
- 239000004698 Polyethylene Substances 0.000 claims abstract description 68
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- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/08—Copolymers of ethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/06—Polyethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/08—Copolymers of ethene
Abstract
The present disclosure provides a composition of a blown film for packaging, a blown film manufactured therefrom, and a manufacturing method. The composition comprises 30-50 wt% of sea-seeking polyethylene, 3-8 wt% of opening slipping agent and 42-67 wt% of low density polyethylene and linear low density polyethylene, wherein the mass part ratio of the low density polyethylene to the linear low density polyethylene is 1 (2-4). According to the preparation method provided by the disclosure, the tensile strength of the blown film prepared from the composition is more than 20MPa, and the elongation at break is more than 300%.
Description
Technical Field
The present disclosure relates to the field of polyethylene blow molding technology, and in particular to a blown film using a marine polyethylene and a method for preparing the same.
Background
According to the survey of the EU Commission, 80% of the marine Plastic wastes are the result of poor Plastic waste management on land, originating from seaworthy plastics (Ocean Bound plastics), OBP for short, i.e. post-consumer waste plastics found along the sea or in nearby waterways over 50 km, and which have no municipal or alternative Plastic transfer processing plants within a radius of 100 km at the site. The waste plastics float on the surface of the sea or suspend in each layer of seawater, so that the transmission of light in the seawater is blocked, the utilization of light by various organisms in the seawater is influenced, the normal life activities of the organisms are interfered, and the organisms in the sea are easily damaged by toxic additives in the plastics. Collecting OBP before the waste plastic reaches the ocean is a less costly environmental activity than when the waste plastic is submerged deep in the ocean or dispersed floating on the ocean. Further, it is necessary to study how to utilize the recovered OBP.
Based on the wide application of plastic products in the industrial field, the degradable plastic bags cannot be produced and circulated in large scale and large scale at present. But the society has already formed a consensus, and needs to restrain white pollution, reduce plastic pollution and enhance public environmental awareness. How to reduce the investment of brand new plastics and recycle the waste plastics is the urgent direction of continuous research. The waste plastics are used as raw materials, so that the pressure caused by the plastic wastes in the environment can be reduced, and the production cost can also be reduced. Compared with newly produced raw materials, the recycled plastics have structural defects due to degradation. The basic mechanical property of the product made by using the master batch formed after the recycling of the recycled plastic is greatly reduced, so the key point of using the recycled OBP is how to ensure that the quality of the product meets the corresponding standard.
The difficulty in recycling Polyethylene (PE) mainly lies in that the melt index and density of each polyethylene component in the recycled material are greatly different, the compatibility is poor, and the processing technology is difficult to determine. PE recovered in a garbage site is generally used, and the PE is mainly used for preparing pipes, sheets and the like aiming at the modification and granulation process of recovered materials.
The packaging film has high requirements on uniformity of appearance and mechanical properties of the film. Many packaging films, such as packages for electronic products, also have clarity requirements. Thus, there has been no report of using recycled PE, particularly, marine polyethylene, to make blown films for packaging.
Disclosure of Invention
The present invention has been made in view of the above problems, and it is an object of the present invention to provide a composition using a marine polyethylene, and a blown film and a method for manufacturing the same, wherein the blown film can be used as a packaging film, has substantially equivalent mechanical properties and better appearance compared to a completely used virgin material, and wherein the amount of the marine polyethylene can be as high as 30 to 50 wt%, providing a new direction for recycling the marine polyethylene.
The first aspect of the disclosure provides a composition of a blown film for packaging, which comprises 30-50 wt% of a sea-seeking polyethylene, 3-8 wt% of an opening slipping agent and 42-67 wt% of a low density polyethylene and a linear low density polyethylene, wherein the ratio of the low density polyethylene to the linear low density polyethylene is 1 (2-4) in parts by mass.
According to some embodiments of the present disclosure, the composition comprises 30 to 40 wt% of the sea-seeking polyethylene, 3 to 5 wt% of the opening slip agent, and 55 to 67 wt% of the low density polyethylene and the linear low density polyethylene, based on the weight of the composition, wherein the ratio of the low density polyethylene to the linear low density polyethylene is 1 (2 to 3) by mass.
According to other embodiments of the present disclosure, the composition comprises 35 to 40 wt% of the sea-seeking polyethylene, 3 to 4 wt% of the opening slip agent and 55 to 60 wt% of the low density polyethylene and the linear low density polyethylene, wherein the ratio of the parts by mass of the low density polyethylene to the linear low density polyethylene is 1 (2 to 2.5).
A second aspect of the present disclosure provides a method of preparing a blown film for packaging, comprising preparing the blown film by a film blowing machine using the composition as described above, wherein the feed section temperature of the screw is 120 to 160 ℃, the plasticizing section temperature is 130 to 150 ℃, and the homogenizing section temperature is 140 to 165 ℃.
According to some embodiments of the present invention, in the method for preparing a blown film for packaging, a blow-up ratio is 2.5 to 3.0.
According to some embodiments of the invention, in the method for preparing the blown film for packaging, the film thickness is 0.05 to 0.07 mm.
According to some embodiments of the present disclosure, in the method of preparing a blown film for packaging, the melt temperature is 150 to 155 ℃.
A third aspect of the present disclosure provides a blown film for packaging, obtained by the method for producing a blown film for packaging as described above.
According to some embodiments of the invention, the blown film has a tensile strength above 20MPa and an elongation at break above 300%.
According to some embodiments of the invention, the blown film has an amount of defects φ<1.5mm/cm 2 。
According to some embodiments of the present invention, the surface of the packaging film is free of precipitates when kept at 60 ℃ for 96 hours.
The invention uses the OBP polyethylene to blow the film, controls the content of the OBP polyethylene to be 30-50 wt% by controlling the process conditions, and realizes the following steps:
(1) the PE packaging film has the advantages that defects such as air bubbles, perforation (except for air holes), water marks, stripes, violent ribs, poor plasticization, fish eyes, stiff blocks and the like which are used in a hindrance mode are not existed, and the density of colors and defects (including impurity points, black points and crystallization points) is acceptable for the PE packaging film of electronic products;
(2) for a film with the thickness of 0.05mm, the tensile strength can reach more than 20MPa, and the elongation at break can reach more than 300%.
Detailed Description
Technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the embodiments of the present disclosure, and it is apparent that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present application.
Percentages or% in this disclosure are by weight or wt% unless otherwise indicated.
Reference in this disclosure to "marine polyethylene" or "OBP polyethylene" refers to a polyethylene-based recycled plastic that conforms to the definition of marine plastic OBP. In particular to the waste plastics which are found in the coastal or nearby water channel within 50 kilometers and have no municipal or alternative post-consumer plastic transfer processing factories within the radius of 100 kilometers of the site, and are obtained by collecting, cleaning, sorting, modifying and granulating.
Plastic packaging films (bags) for electronic products are generally transparent films (bags) obtained by blow molding a blend of LDPE and LLDPE. Such packages need to have a certain protection effect on the surface of the electronic product and have a good appearance, and therefore generally have a certain thickness and certain requirements for tensile strength and elongation at break. Usually, the tensile strength is 20MPa or more; the elongation at break is 130% or more for a film having a thickness of less than 0.050mm, and 300% or more for a film having a thickness of 0.050mm or more. However, the packaging film is single in use and disposable, and the usage amount of the packaging film is increased along with the increasing use demand of electronic products. Therefore, if the packaging film of the electronic product can be prepared by using part of the recovered PE, the application of the recovered PE can be widened, and the method has practical significance for protecting the environment and reducing the use of non-degradable plastics.
To this end, the first aspect of the present disclosure provides a composition of a blown film for packaging using a marine polyethylene, specifically, an OBP polyethylene may be used in an amount of 30 to 50 wt%. The blown film of the composition completely meets the use requirements on the properties of tensile strength, elongation at break and the like, and has better appearance. The film prepared by the composition disclosed by the invention is basically free of defects of scratches caused by rubbing the surface of an electronic product, and has no precipitates (namely, the precipitation of unknown additives in recycled plastics can be well controlled) at a high temperature of 90 ℃ for 96 hours. The requirements of the packaging film of the electronic product are met in all aspects, a new application direction is opened for the OBP regenerated PE, and the packaging cost is reduced.
Low density polyethylene
Low Density Polyethylene (LDPE) is prepared by polymerizing ethylene at high temperature and high pressure by a free radical mechanism, has a linear structure with more branched chains, usually contains 20-30 branched chains in each 1000 carbon chain atoms, has the crystallinity of 45-65 wt%, and is the lightest variety of polyethylene.
In the compositions of the present disclosure, the molecular weight of the LDPE is typically from 5 to 50 ten thousand. The dosage of the LDPE is 8-23 wt% based on the total weight of the composition.
Linear low density polyethylene
Linear Low Density Polyethylene (LLDPE), which is a molecular structure of ethylene with very short comonomer branches in the linear ethylene backbone, is formed by a catalytic polymerization mechanism with a narrower molecular weight distribution than LDPE, with a small amount of alpha-olefins. Although the density of the LDPE is in the same range (0.91-0.93 g/cm) 3 And (b) but the melting point is improved by 10-15 ℃, the tensile strength and the tear strength are generally 1.5-2 times higher than those of LDPE, and the environmental stress cracking resistance, the low temperature resistance, the heat resistance and the puncture resistance are more excellent. More preferably metallocene polyethylene (M-LLDPE), which has a narrower molecular weight distribution and further improved strength and elongation properties due to the use of a specific metallocene catalyst.
LDPE has more molecular chain entanglement and the deformation rate increases during blow molding, and the viscosity of LDPE increases, resulting in strain hardening problems. LLDPE has a narrow molecular weight distribution and short chain branches, which improves the above-mentioned problems, with less shear sensitivity. However, LLDPE has a higher viscosity and requires higher melt temperatures and pressures. Meanwhile, LLDPE has higher crystallinity, thus causing the surface roughness of the film, increasing the haze of the film and having insufficient glossiness. In addition, film bubbles are not as stable as LDPE during the blow molding process.
In the composition of the present disclosure, the LLDPE is used in an amount of 28 to 54 wt% based on the total weight of the composition.
The total dosage of LDPE and LLDPE is 42-67 wt% based on the total weight of the composition, and the ratio of the LDPE and LLDPE is 1 (2-4).
OBP polyethylene
In the compositions of the present disclosure, the OBP polyethylene is found in 50 km regions of coastal or nearby waterways and is obtained without post-consumer waste polyethylene from municipal or alternative plastic transfer processing plants within a 100 km radius of the site by salvage recovery, washing, sorting, modification granulation. The OBP polyethylene may include LDPE, LLDPE, and small amounts of other types of PE.
The invention finds that the amount of the OBP polyethylene used in the composition can reach 30-50 wt%, the blow molding polyethylene film can still have acceptable appearance, the tensile strength is still maintained above 20MPa, the elongation at break is maintained above 300%, and the requirements of PE packaging films of electronic products are met.
Mouth-opening slipping agent
After the polyethylene film is formed, the surface structure shows great affinity and friction coefficient, so that the friction between the film and equipment is great to influence the processing speed, and closed films are not easy to separate and the smoothness of the film is reduced. The problems can be solved by selecting and using a proper opening slipping agent according to the compatibility of the opening slipping agent and the base material. Commonly used mouth-opening slip agents are divided into inorganic and organic classes. Inorganic species include silica, calcium carbonate, and the like; organic species include oleamide, erucamide, and the like. The organic matter forms a layer of lubricating film on the surface of the film, and the possibility of polluting the packaged objects is high. The present disclosure prefers inorganic type opening slip agents of a mixture of silica rich mineral fines and hydrated magnesium silicate.
As the OBP proportion increases, the surface smoothness and clarity of the film decreases. The invention improves the surface smoothness of the film by using the opening slipping agent, reduces snakeskin lines, crystal points and microcrystal points, eliminates the tiny unevenness or water ripples on the surface of the film and obviously improves the transparency of the film. According to an embodiment, the composition of the present disclosure has 3 to 8 wt.%, preferably 3 to 5 wt.%, more preferably 3 to 4 wt.% of the opening slip agent, based on the total weight of the composition.
Other regulators and process aids with different functions, such as color master batch and the like, which are well known to those skilled in the art, can also be added into the composition.
According to an embodiment of the present disclosure, the composition may include 30 to 40 wt% of the OBP polyethylene, 8 to 23% of the LDPE, 28 to 54% of the LLDPE and 3 to 8% of the opening slip agent based on the total weight of the composition.
According to some embodiments, preferably, the composition may include 30 to 40 wt% of the OBP polyethylene, 14 to 23% of the LDPE, 37 to 50% of the LLDPE and 3 to 5% of the open-finish slip agent, based on the total weight of the composition.
According to other embodiments, more preferably, the composition may include 35 to 40 wt% of the OBP polyethylene, 14 to 17% of the LDPE, 39 to 45% of the LLDPE, and 3 to 4% of the open-finish slip agent, based on the total weight of the composition.
The second aspect of the disclosure provides a method for preparing the polyethylene blown film for packaging, which comprises accurately weighing the sea-seeking polyethylene, the opening slipping agent, the low density polyethylene and the linear low density polyethylene according to the weight percentage, adding the materials into a mixer, mixing for 30 minutes, and then preparing the polyethylene blown film through a film blowing machine.
Process for preparing polyethylene blown film
The process of blow molding the film is that different types of polyethylene, regulator, color master and the like are fed through a hopper, the materials are extruded into a thin tube, then the plastic is blown by compressed air while the materials are hot, and the plastic is cooled and shaped through an air ring to obtain a cylindrical film product. The properties of blown film have a great relationship with the production process parameters, mainly including the blowing ratio of the film, the processing temperature, the film thickness control and the like. The process parameters are controlled by first ensuring that the blown film should not have defects such as blisters, perforations (other than air holes), water marks, streaks, ribbing, poor plasticization, fish eyes, and stiff mass that can interfere with use.
The blow-up ratio is the ratio of the bubble diameter to the die diameter during blow molding and reflects the transverse expansion factor of the film. The blowing ratio is too small, so that the film becomes thick and the cost is increased; the blow-up ratio is increased, the film is thinned, the strength of the film is reduced although the optical performance can be improved and the material can be saved; too large a blow-up ratio may also cause instability of the bubble and the film may be prone to wrinkling. Generally, the blow-up ratio of LDPE film should be controlled to be 2.5-3.0, so the blow-up ratio of the method for preparing the blown film of the sea-seeking polyethylene used in the present disclosure is also 2.5-3.0.
Materials with too high extrusion temperature are easy to decompose, so that the tensile strength is obviously reduced; when the extrusion temperature is too low, plasticization is poor, expansion stretching cannot be smoothly performed, the gloss and transparency of the surface are poor, and even wood-like patterns and unmelted crystal nuclei (fish eyes) appear, which also deteriorate the tensile strength. In general, the extrusion temperature of blown LDPE films is typically controlled to between 160 ℃ and 170 ℃. The method for preparing the blown film of the used sea-seeking polyethylene comprises the steps of enabling the temperature of a feeding section of a screw to be 120-160 ℃, the temperature of a plasticizing section to be 130-150 ℃ and the temperature of a homogenizing section to be 140-165 ℃. The melt temperature can be 150-165 ℃ and is wholly lower than the film blowing process temperature of a new material.
The method disclosed by the invention can be used for preparing the film by a film blowing process, wherein the film blowing process comprises the steps of blowing-up ratio of 2.5-3.0, film thickness of 0.05-0.07 mm, feeding section temperature of a screw rod of 120-160 ℃, plasticizing section temperature of 130-150 ℃ and homogenizing section temperature of 140-165 ℃.
A third aspect of the present disclosure provides a blown film, which is produced by the above blown film production method, using the above composition for a blown film for packaging. Tensile strength and elongation at break are two main measures of the mechanical properties of PE films, where the transverse direction tensile strength is lower than the machine direction tensile strength and the transverse direction elongation at break is higher than the machine direction elongation at break. PE packaging films for electronic products generally require tensile strength of greater than 20MPa and elongation at break of greater than 130%. As OBP content increases, tensile strength and elongation at break decrease, but the inventors have found that, under the process conditions of the present disclosure, it is possible to ensure that the transverse tensile strength is maintained above 20MPa and the longitudinal elongation at break is maintained above 300% with the compositions of the present disclosure.
Color and density of crystallization points are two main indicators of the appearance of PE films. The skilled person can judge whether the color depth and the density of the film surface defects (impurity points, black points and crystal points) are within an acceptable range by direct observation. As the OBP addition ratio is higher, it appears darker in color, more defects on the film surface, and worse in visual perception. Usually the grain or black spot phi is larger than 1.5mm/cm 2 It is determined to be bad. The present inventors have found that, under the process conditions of the present disclosure, the use of the compositions of the present disclosure can ensure that the appearance of the blown film is acceptable for PE packaging films for electronic products.
The disclosure is further illustrated with reference to specific examples.
The polyethylene LDPE used in the examples was a medium petroleum grade 2426K product and the LLDPE was a Sabic grade 218W product. The OBP polyethylene is a product of YouHE 1049, the trademark of YouHE Youngs, Yonghong renewable resources, Inc., and has a nominal tensile strength of 20MPa, an elongation at break of 621%, a density of 0.922g/mL, a melt flow rate of 1.02g/10min (190 ℃,2.16kg), a melting point of 122 ℃ and a Shore hardness D of 45. The open-mouthing slip agent of the present disclosure is a product of the friendship designation 301.
First, OBP polyethylene, LLDPE, LDPE, and a split slip agent in different weight ratios were added to a model YX1.5T mixer and mixed for 30 minutes, wherein the specific composition formulations of the examples of the present invention and comparative examples are shown in table 1.
Table 1: formulation of blown film compositions
Then, a polyethylene blown film was prepared by a blowing machine of the holy 120 type. The temperature of the forming die was 150 to 165 ℃ and the thickness of the film was 0.05 to 0.07mm, which are the same in each example and comparative example of the present invention, but the inflation ratio of the film, the temperature of the feeding section of the cylinder, the temperature of the plasticizing section, the temperature of the homogenizing section, and the temperature of the melt were adjusted according to the amount of the OBP polyethylene, as shown in table 2.
Table 2: process for blowing films
With reference to the test method of GB/T1040.3, the mechanical properties of examples 1-5 and comparative example 1 were tested, as shown in Table 3.
Table 3: blown film formulation and melt temperature
As can be seen from the data shown in Table 3, by controlling the content of the OBP polyethylene to be 30-50 wt%, the transverse tensile strength can be ensured to be more than 20MPa, the longitudinal elongation at break is ensured to be more than 300%, the strength requirement of the PE packaging film of the electronic product is met, and the recycled OBP polyethylene is used to the maximum extent.
The amount of defects phi is defined as the cumulative ruler of defects per square centimeter of area. The content of the OBP polyethylene is controlled to be 30-50 wt%, and the defect amount phi of the blown film can be ensured<1.5mm/cm 2 PE packaging films are acceptable for electronic products.
The product transportation package vibration test is to simulate the vibration working condition of a package in the circulation process, detect whether the package plays a role in vibration isolation, evaluate the protection capability of the package on contents, and require that the package material cannot cause performance and appearance damage to the product after the vibration test is finished. Referring to the GB/T4857.23-2021 transport package basic test part 23, namely a vertical random vibration test method, a simulated package is fixed on a table board of a vibration testing machine, a triaxial random vibration test is carried out on the simulated package according to vibration test parameters with the frequency range of 2-200 Hz and the Grms value of 1.04, the vibration time is 15min per axial direction, after the triaxial total test time is 45min, a product is taken out, and the product is checked to be free of abnormality, and the result shows that the packaging film manufactured by controlling the content of the OBP polyethylene to be 30-50 wt% can ensure that no crystal point rubs the surface paint of the product and generates the impression phenomenon.
The high-low temperature environment test simulates the storage adaptability of products and packages under the climatic environment conditions of high (low) temperature and different humidity (reference standard: GB/T2423.2-2008, GB/T2423.1-2008), and the packaging bags are subjected to temperature and humidity combined circulation, the ultimate high temperature is 60 ℃, the ultimate low temperature is-40 ℃, the total test time is 96H, and the packaging bags are free of aging, peculiar smell and precipitate on the surfaces. The result shows that the packaging film manufactured by controlling the content of the OBP polyethylene to be 30-50 wt% has no aging, no peculiar smell and no precipitate on the surface after temperature and humidity combined circulation at the ultimate high temperature of 60 ℃ and the ultimate low temperature of-40 ℃ for the total time of 96H.
Based on the comparison of the performance, appearance and transport package tests, the performance, yield, cost and appearance of the blown film prepared by adding 30-50 wt% of the OBP polyethylene are close to those of the common standards, and the blown film can be put into use in mass production.
The above description is only a preferred embodiment of the present disclosure, and is not intended to limit the claimed scope of the present disclosure, and all modifications, substitutions, or direct/indirect applications of the present disclosure to other related technical fields under the inventive concept of the present disclosure are included in the claimed scope of the present disclosure.
Claims (11)
1. A blown film composition for packaging, wherein the composition comprises, by weight of the composition:
30 to 50 wt% of a sea-seeking polyethylene,
3 to 8 wt% of an opening slipping agent,
42 to 67 wt% of low density polyethylene and linear low density polyethylene,
wherein the mass ratio of the low density polyethylene to the linear low density polyethylene is 1 (2-4).
2. The composition of claim 1, wherein the composition comprises, by weight of the composition:
30 to 40 wt% of a sea-seeking polyethylene,
3 to 5 wt% of an open-mouthed slip agent,
55 to 67 wt% of low density polyethylene and linear low density polyethylene,
wherein the mass ratio of the low density polyethylene to the linear low density polyethylene is 1 (2-3).
3. The composition of claim 1, wherein the composition comprises, by weight of the composition:
35 to 40 wt% of a sea-seeking polyethylene,
3-4 wt% of an opening slipping agent,
55 to 60 wt% of low density polyethylene and linear low density polyethylene,
wherein the mass ratio of the low density polyethylene to the linear low density polyethylene is 1 (2.5-3).
4. A method of making a blown film for packaging comprising the steps of:
the blown film is produced by a film blowing machine using the composition according to any one of claims 1 to 3, wherein the feed section temperature of the screw is 120 to 160 ℃, the plasticizing section temperature is 130 to 150 ℃, and the homogenizing section temperature is 140 to 165 ℃.
5. The method according to claim 4, wherein the blow-up ratio is 2.5 to 3.0.
6. The method of claim 5, wherein the film thickness is 0.05 to 0.07 mm.
7. The method of claim 6, wherein the melt temperature is 150-165 ℃.
8. A blown film for packaging, obtained by the process according to any one of claims 4 to 7.
9. The blow molded film for packaging according to claim 7, wherein the tensile strength of the blow molded film is 20MPa or more and the elongation at break is 300% or more.
10. The blown film for packaging as claimed in claim 8, wherein the blown film has a defect amount φ<1.5mm/cm 2 。
11. The blown film for packaging according to claim 9, wherein the surface of the packaging film is free from precipitates when kept at 60 ℃ for 96 hours.
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