CN114573893A - Middle layer composite material of heavy packaging film and preparation method thereof - Google Patents

Middle layer composite material of heavy packaging film and preparation method thereof Download PDF

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Publication number
CN114573893A
CN114573893A CN202011385539.5A CN202011385539A CN114573893A CN 114573893 A CN114573893 A CN 114573893A CN 202011385539 A CN202011385539 A CN 202011385539A CN 114573893 A CN114573893 A CN 114573893A
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film
weight
master batch
density
flow rate
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张德英
吴双
葛腾杰
王熺
王世华
姜艳峰
李�瑞
张明强
安彦杰
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Petrochina Co Ltd
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Petrochina Co Ltd
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • 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
    • C08J2323/06—Polyethene
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
    • C08K13/02—Organic and inorganic ingredients
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2237—Oxides; Hydroxides of metals of titanium
    • C08K2003/2241—Titanium dioxide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C08K3/36—Silica
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
    • C08K5/098—Metal salts of carboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/04—Oxygen-containing compounds
    • C08K5/13—Phenols; Phenolates
    • C08K5/134—Phenols containing ester groups
    • C08K5/1345—Carboxylic esters of phenolcarboxylic acids

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Abstract

The utility model discloses a middle layer composite material of a heavy packaging film and a preparation method thereof, the middle layer composite material of the heavy packaging film is prepared by a melt blending method, and the middle layer composite material of the heavy packaging film is prepared by four raw materials according to parts by weight, wherein LLDPE accounts for 0.05-0.15 part by weight; mLDPE, 0.1-0.3 weight part; 0.5-0.7 weight part of HDPE; 0.01 to 0.02 weight portion of reinforced master batch. The preparation method of the middle layer composite material of the heavy packaging film is to directly melt and blend the four raw materials to prepare the special material of the middle layer of the heavy packaging film. The reinforced master batch contains nano-scale silicon dioxide, and the proper amount of the reinforced master batch is added into the polyethylene resin, so that the toughening and reinforcing effects can be achieved, various mechanical properties of the composite material in the middle layer of the heavy packaging film can be improved, and the use requirement of the heavy packaging film can be met.

Description

Middle layer composite material of heavy packaging film and preparation method thereof
Technical Field
The utility model relates to a composite material and a preparation method thereof, in particular to a middle layer composite material of a heavy packaging film and a preparation method thereof, and specifically relates to a melt blending linear low density polyethylene/high density polyethylene/metallocene polyethylene (LLDPE/HDPE/mLLDPE) composite material and a preparation method thereof.
Background
With the rapid development of the packaging industry, the heavy packaging film bag becomes a packaging development trend, the traditional composite film woven bag is far from meeting the requirements of the current large industrial production, and the trend that the heavy packaging film bag completely replaces the woven bag is achieved.
Compared with other packaging bags, the heavy packaging film bag has the characteristics of convenience in use, attractiveness, moisture resistance, good dust resistance and the like, and therefore, is a development trend of packaging synthetic resin products.
The heavy packaging film is mainly used for packaging solid petrochemical products such as catalysts, fertilizers, synthetic resins and other commodities. In order to achieve a good packaging effect, the film is required to have good heat sealability, good stiffness, puncture resistance, strength, printability, high gloss and good stacking property. At present, compared with imported heavy packaging film bags, domestic heavy packaging film bags have the defects of poor heat sealing property and appearance, poor puncture resistance and printability, dust absorption and the like of films, and the film bags are expensive because imported materials are mainly used as raw materials. Therefore, a large amount of domestic chemicals are still packaged by woven bags, and the packaging grade is low; the special moisture-proof and light-proof package mainly adopts multilayer composite paper bags at present, and the sealing strength is lower. In order to improve the competitiveness of products, the heavy packaging film bag has lower cost and is easy to seal compared with a multi-layer paper composite bag.
Foreign synthetic resin is mainly packaged by heavy packaging film bags, the foreign heavy packaging film bags are mainly produced by blending metallocene polyethylene and medium density polyethylene, and the packaging bags are high in strength and high in puncture resistance. The packaging of domestic solid chemicals mainly takes woven bags as main materials, and the packaging has the problems of dust absorption, moisture absorption and the like.
CN201910366748.6 relates to a three-layer composite high-grade rice bag with good air tightness and a preparation method thereof the utility model discloses a three-layer composite high-grade rice bag with good air tightness and a preparation method thereof, comprising the following steps: making rice paper: sending wood pulp into a papermaking machine to prepare rice paper, and preparing the composite film: compounding the rice paper, the nylon film and the polyethylene film in sequence to prepare a composite film, and the rice bag manufacturing step: the rice bag is made of the composite film material, in the process of preparing the three-layer composite high-grade rice bag with good air tightness, the surface of the rice paper-like paper has obvious curved or linear fiber bundles, the rice paper-like paper presents natural and beautiful artistic texture, and has excellent pressure resistance and good air tightness.
CN201711347873.X relates to a multilayer composite film and a preparation method thereof the utility model provides a multilayer composite film and a preparation method thereof. Wherein the multilayer composite film comprises an upper layer film, a lower layer film and a middle layer film; the components of the intermediate layer film comprise nano ceramic particles and polyethylene; the components of the upper and lower films are polyolefin substances. Compared with a single raw material diaphragm produced by a conventional wet method in the prior art, the multilayer composite membrane composed of the multilayer structure and multiple raw materials provided by the utility model has more excellent thermal and mechanical properties, improves the safety of producing power battery products, and has better application prospect in the field of power batteries.
CN201510925042.0 relates to a medical multilayer composite anti-adhesion membrane and a preparation method thereof, belongs to the technical field of biomedicine, and particularly relates to a medical multilayer composite anti-adhesion membrane and a preparation method thereof. The multi-layer composite anti-adhesion film comprises a layer of gel film, and one side or two sides of the gel film are water-soluble films. During preparation, a layer of gel film can be prepared first, and then a water-soluble film is cast on one side or two sides of the gel film; or preparing the gel film and the water-soluble film respectively, and compounding the gel film and the water-soluble film in a small amount of water environment. The multilayer composite anti-adhesion membrane disclosed by the utility model can be used for adhering the anti-adhesion membrane with tissues and organs through slow dissolution of the water-soluble membrane so as to avoid the operation of suturing and fixing the anti-adhesion membrane in the operation process, and can also play the roles of mechanical support and physical barrier after being implanted into a body for a long time through the stable existence of the gel membrane, so that the occurrence of postoperative adhesion is inhibited. The multilayer composite anti-adhesion membrane has wide application value in adhesion prevention after operations on heart, abdominal cavity, pelvic cavity and other parts.
The utility model relates to a CN201410053594.2 pure PE three-layer plastic film, an edge packaging bag prepared from the pure PE three-layer plastic film and a production method of the edge packaging bag, and relates to the technical field of plastic film manufacturing, in particular to a pure PE three-layer plastic film, which comprises an outer layer, a middle layer and an inner layer, wherein the outer layer comprises the following raw materials in percentage by weight: 78-90% of metallocene, 6-15% of low-density polyethylene, 3-5.5% of high-density polyethylene and 0.8-3.2% of slipping agent, wherein the middle layer comprises the following raw materials in percentage by weight: 70-85% of metallocene, 12-25% of low-density polyethylene, 2-5% of high-density polyethylene and 0.8-2.5% of slipping agent, wherein the inner layer comprises the following raw materials in percentage by weight: 70-85% of metallocene, 12-25% of low-density polyethylene and 1-5% of slipping agent; compared with the prior art, on the premise of ensuring the stiffness and the strength of the plastic film, the utility model can control the heat sealing distance of the corners at the four edge sealing edges of the packaging bag to be within 5mm, and breaks through the defects of the traditional PE industry, the four edge sealing bag does not touch the PE industry till now, and most of the four edge sealing bag is applied to the composite film, thereby simplifying the production process, ensuring the attractive appearance of the outer packaging bag and greatly reducing the packaging cost of manufacturers using the composite film.
CN201210318973.0 relates to a three-layer co-extrusion composite film based on medicinal packaging. The utility model adopts the following technical scheme, and the three-layer co-extrusion composite film based on the medicinal package is characterized in that: the modified polyamide adhesive comprises a modified polyamide layer, a modified linear low-density polyethylene layer and an adhesive layer, wherein the adhesive layer is arranged between the modified polyamide layer and the modified linear low-density polyethylene layer, and the adhesive layer, the modified linear low-density polyethylene layer and the modified polyamide layer respectively form adhesive matching. By adopting the scheme, the utility model overcomes the defects in the prior art, and provides the novel three-layer co-extrusion composite film based on the medical packaging, which meets some basic requirements of medical infusion bag packaging, such as heat sealing performance, printability, 121 ℃ cooking resistance, transparency and (impact resistance) strength.
The utility model relates to a flexible package composite film, belongs to the technical field of plastic packaging, and discloses a flexible package composite film which comprises a printing layer, a blocking layer and a heat sealing layer which are sequentially arranged from outside to inside, wherein the heat sealing layer is a mixed layer of low-density polyethylene, a polyolefin elastomer and metallocene polyethylene, and the heat sealing layer has good blocking property due to the composite structure, so that the problem of corrosion and delamination of the composite film caused by the fact that the content of the flexible package composite film permeates the heat sealing layer and corrodes the adhesive layer is solved. In addition, the heat-sealing layer provided by the utility model also has good mechanical properties, excellent low-temperature heat sealability and pollution resistance.
The problems that all raw materials of high-grade packaging film bags depend on import, the cost is high, the breakage rate of the film bags is high and the like exist at present, and how to produce a middle-layer special material for high-grade heavy packaging films by using domestic materials instead of imported materials becomes a technical problem to be solved urgently in the field.
How to improve the tensile yield strength, the tearing strength and the puncture resistance of the heavy packaging film becomes the key for solving the problems, and the tensile yield strength and the tearing strength of the heavy packaging film bag can be improved by a micro-crosslinking technology to meet the use requirements of the heavy packaging film. Thereby preparing a high-strength heavy packaging film intermediate layer material, which becomes a technical problem to be solved urgently in the field.
Disclosure of Invention
Aiming at the defects in the prior art, the utility model provides a special material for a middle layer composite material of a high-grade heavy packaging film with high tensile strength and high puncture resistance and a preparation method thereof, namely a linear low-density polyethylene/high-density polyethylene/metallocene polyethylene melt blending composite material and a preparation method thereof.
In order to achieve the above object, the present invention provides a middle layer composite material for heavy packaging film, comprising:
linear Low Density Polyethylene (LLDPE): 0.05-0.15 weight part;
high Density Polyethylene (HDPE): 0.5-0.7 weight parts;
metallocene polyethylene (mLLDPE): 0.1-0.3 weight parts; and
reinforcing master batch: 0.01-0.02 weight parts;
the reinforced master batch comprises the components of nano-scale talcum powder, nano-scale silicon dioxide and nano-scale titanium dioxide.
Preferably, the density of the layer composite in the heavy packaging film of the utility model is from 0.935 to 0.940g/cm3。
Preferably, the Linear Low Density Polyethylene (LLDPE) of the present invention has a density of from 0.918 to 0.922g/cm3The melt flow rate is from 1.7 to 2.3g/10min, preferably from 1.8 to 2.0g/10 min.
PreferablyThe High Density Polyethylene (HDPE) of the present invention has a density of 0.949 to 0.955g/cm3The melt flow rate is from 0.6 to 1.0g/10min, preferably from 0.8 to 1.0g/10 min.
Preferably, the metallocene polyethylene (mLLDPE) of the present invention has a density of from 0.924 to 0.929g/cm3The melt flow rate is from 1.3 to 1.8g/10min, preferably from 1.5 to 1.8g/10 min.
Preferably, the components of the reinforcing masterbatch of the utility model also comprise a linear low density polyethylene powder (LLDPE powder), and calcium stearate or zinc stearate; the linear low density polyethylene powder has a density of 0.917-0.923g/cm3The melt flow rate is 1.5-2.5g/10 min.
Preferably, the reinforcing master batch comprises 1 wt% of nano-scale talcum powder, 5 wt% of nano-scale silicon dioxide, 20 wt% to 25 wt% of nano-scale titanium dioxide, 1 wt% of calcium stearate or 1 wt% of zinc stearate, and 70 wt% of linear low density polyethylene powder (LLDPE powder).
Preferably, the repackaging film layer composite of the present invention comprises:
linear low density polyethylene: 0.05-0.10 weight part;
high density polyethylene: 0.55-0.65 weight parts;
metallocene polyethylene: 0.25-0.3 weight parts; and
reinforcing master batch: 0.01 weight portion.
The utility model also provides a preparation method of the middle-layer composite material of the heavy packaging film, which comprises the following steps:
(1) preparation of the reinforced master batch: weighing 1 wt% of nanoscale talcum powder, 5 wt% of nanoscale silicon dioxide, 20 wt% -25 wt% of nanoscale titanium dioxide, 1 wt% of calcium stearate or 10761 wt% of zinc stearate, and 70 wt% of linear low-density polyethylene powder; mixing for 3-5min in a high-speed mixer, and then performing extrusion granulation in a double-screw extruder at the screw rotating speed of 55-150 rPm and the temperature of 160-190 ℃ to obtain reinforced master batch;
(2) weighing 0.05-0.15 part by weight of linear low-density polyethylene, 0.5-0.7 part by weight of high-density polyethylene, 0.1-0.3 part by weight of metallocene polyethylene and 0.01-0.02 part by weight of the reinforced master batch in the step (1);
(3) and (3) mixing the materials in the step (2) in a high-speed mixer for 3-5min, and placing the mixture in a film blowing machine at the temperature of 160-190 ℃ for film blowing to obtain the intermediate-layer composite material of the heavy packaging film.
The utility model can also be detailed as follows:
the technical scheme adopted by the utility model is as follows: the material is prepared from the following components in parts by weight:
LLDPE, melt flow rate of 2.0g/10min, density of 0.918g/cm3(ii) a HDPE, melt flow rate 0.6-1.0g/10min, density 0.949-0.955g/cm3(ii) a mLLDPE with a melt flow rate of 1.3-1.8g/10min and a density of 0.924-0.929g/cm3。
0.05 to 0.15 weight portion of LLDPE; mLLDPE, 0.1-0.3 weight portions; 0.5-0.7 part by weight of HDPE; 0.01 to 0.02 weight portion of reinforced master batch.
The utility model also provides a preparation method of the middle layer material of the heavy packaging film, which comprises the following specific steps:
(1) preparation of the reinforced master batch: weighing appropriate amount of nano-scale talcum powder and nano-scale silicon dioxide respectively 1% -5%, nano-scale titanium dioxide 20% -25%, calcium stearate or zinc stearate 1 ‰, 10761 ‰, and LLDPE powder (melt flow rate 1.5-2.5g/10min, density 0.917-0.923 g/cm)3)70％。
(2) Mixing the above materials in a high speed mixer for 3-5 min;
(3) extruding and granulating in a double-screw extruder at the screw rotating speed of 55-150 rPm and the temperature of 160-190 ℃ to obtain the reinforced master batch.
(4) Mixing the low-density polyethylene/high-density polyethylene/metallocene polyethylene and the reinforced master batch in a high-speed mixer for 3-5min, putting the mixture in a film blowing machine, and melting and blending the mixture at the temperature of 160-190 ℃ to prepare the high-strength heavy packaging film.
Compared with the prior art, the utility model has the following advantages:
the utility model adopts a melt blending method, generates a micro-crosslinking structure after melt blending, greatly improves the tensile strength and the drop impact strength of the middle-layer composite material of the heavy packaging film, prepares the middle-layer composite material of the heavy packaging film with high strength and high puncture resistance, and meets the use requirement of the middle-layer composite material of the heavy packaging film.
The middle layer composite material of the heavy packaging film is required to have excellent puncture resistance and excellent high-altitude falling performance. The utility model adopts LLDPE/HDPE/mLLDPE to add into the reinforced master batch for the first time to mix and blow the film to improve the puncture resistance and tensile strength of the middle layer composite material in the heavy packaging film. The reinforcing agent particles are combined with a plurality of macromolecular chains in the resin to form a cross-linked structure. When one molecular chain is stressed, the stress is dispersed and transmitted to other molecules through the cross-linking point. If one chain is broken, the other chains can play the same role of reinforcement, and the LLDPE/HDPE/mLLDPE can obviously play the role of reinforcement of a heavy packaging film by adding the reinforced master batch of the utility model, thereby meeting the use requirements of high rigidity and high toughness of the heavy packaging film. Meanwhile, the reinforcing master batch contains nano-scale silicon dioxide, and the effect of toughening and reinforcing can be achieved by adding a proper amount of the reinforcing master batch into linear low-density polyethylene, high-density polyethylene and metallocene polyethylene, so that various mechanical properties of the composite material in the middle layer of the heavy packaging film are improved, and the use requirement of the composite material in the middle layer of the heavy packaging film is met.
Detailed Description
The utility model will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes and modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Example 1
(1) Preparation of the reinforced master batch: weighing 1% and 5% of nanoscale talcum powder and nanoscale silicon dioxide, 24% of nanoscale titanium dioxide, 1 ‰ and 10761%3)70％。
(2) Mixing the above materials in a high-speed mixer for 5 min;
(3) and (3) putting the mixed raw materials into a double-screw extruder for extrusion granulation, wherein the rotating speed is 55-150 rPm, and the temperature is 160-190 ℃ to obtain the reinforced master batch.
(4) The heavy packaging film middle layer material is prepared from the following components in parts by weight:
the LLDPE had a melt flow rate of 2.0g/10min and a density of 0.918g/cm3(ii) a The melt flow rate of HDPE was 0.8g/10min, and the density was 0.954g/cm3(ii) a The mLLDPE had a melt flow rate of 1.3g/10min and a density of 0.926g/cm3。
0.15 part by weight of LLDPE; mLLDPE, 0.15 parts by weight; 0.7 part by weight of HDPE; 0.01 part by weight of reinforcing master batch.
(5) Mixing the above materials in a high-speed mixer for 5 min;
(6) and blowing the film on a film blowing machine unit with the diameter of the screw rod of 45mm at the film blowing temperature of 169-190 ℃ to prepare a test film for testing.
Example 2
(1) Preparation of the reinforced master batch: weighing 1% and 5% nanometer pulvis Talci and nanometer silicon dioxide, 24% nanometer titanium dioxide, 1 ‰ and 10761 ‰ calcium stearate or zinc stearate, LLDPE powder (melt flow rate 2.0g/10min, density 0.918 g/cm)3)70％。
(2) Then mixing the materials in a high-speed mixer for 4min according to the formula proportion;
(3) the reinforced master batch can be obtained under the conditions of extrusion granulation rotating speed of 55-150 rPm and temperature of 160-190 ℃ in a double-screw extruder.
(4) The heavy packaging film middle layer material is prepared from the following components in parts by weight:
the LLDPE had a melt flow rate of 2.0g/10min and a density of 0.918g/cm3(ii) a The melt flow rate of HDPE was 0.8g/10min, and the density was 0.954g/cm3(ii) a melt flow Rate of mLLDPEThe ratio is 1.3g/10min, and the density is 0.926g/cm3。
0.1 part by weight of LLDPE; mLLDPE, 0.20 parts by weight; 0.7 part by weight of HDPE; 0.01 part by weight of reinforcing master batch.
(5) Mixing the above materials in a high-speed mixer for 5 min;
(6) and (3) blowing the film on a film blowing machine unit with the screw diameter of 45mm at the film blowing temperature of 169-190 ℃ to prepare a test film for testing.
Example 3
(1) Preparation of the reinforced master batch: weighing appropriate amount of nanoscale pulvis Talci and nanoscale silica respectively 1% and 5%, nanoscale titanium dioxide 24%, calcium stearate or zinc stearate 1 ‰, 10761 ‰, and LLDPE powder (melt flow rate 2.0g/10min, density 0.918 g/cm)3)70％。
(2) Mixing the above materials in a high-speed mixer for 5 min;
(3) the reinforced master batch can be obtained under the conditions of extrusion granulation rotating speed of 55-150 rPm and temperature of 160-190 ℃ in a double-screw extruder.
(4) The material for the middle layer of the heavy packaging film is prepared from the following components in parts by weight:
the LLDPE had a melt flow rate of 2.0g/10min and a density of 0.918g/cm3The HDPE has a melt flow rate of 0.8g/10min and a density of 0.954g/cm3The mLLDPE had a melt flow rate of 1.3g/10min and a density of 0.926g/cm3。
0.5 part by weight of LLDPE; 0.25 parts by weight of mLLDPE; 0.7 part by weight of HDPE; 0.01 part by weight of reinforcing master batch.
(5) Then, mixing the materials in a high-speed mixer for 5min according to the formula proportion;
(6) and (3) blowing the film on a film blowing machine unit with the diameter of the screw rod of 45mm at the processing temperature of 160-190 ℃ to prepare a test film for testing.
Example 4
(1) Preparation of the reinforced master batch: weighing appropriate amount of nanoscale talcum powder and nanoscale silicon dioxide respectively1 percent and 5 percent of nano titanium dioxide, 24 percent of nano titanium dioxide, 1 per mill, 10761 per mill of calcium stearate or zinc stearate, LLDPE powder (melt flow rate 2.0g/10min, density 0.918 g/cm)3)70％。
(2) Then mixing the materials in a high-speed mixer for 5min according to the formula proportion;
(3) the reinforced master batch can be obtained under the conditions of extrusion granulation rotating speed of 55-150 rPm and temperature of 160-190 ℃ in a double-screw extruder.
(4) The middle layer material of the heavy packaging film can be obtained by blending the following materials in parts by weight:
the LLDPE had a melt flow rate of 2.0g/10min and a density of 0.918g/cm3The HDPE has a melt flow rate of 0.8g/10min and a density of 0.954g/cm3The mLLDPE had a melt flow rate of 1.3g/10min and a density of 0.926g/cm3。
0.05 part by weight of LLDPE; mLLDPE, 0.3 parts by weight; 0.65 part by weight of HDPE; 0.01 part by weight of reinforcing master batch.
(5) Then, mixing the materials in a high-speed mixer for 5min according to the formula proportion;
(6) and (3) blowing the film on a film unit with the diameter of the screw rod of 45mm at the processing temperature of 160-190 ℃ to prepare a test film for testing.
Example 5
(1) Preparation of the reinforced master batch: weighing appropriate amount of nanoscale pulvis Talci and nanoscale silica respectively 1% and 5%, nanoscale titanium dioxide 24%, calcium stearate or zinc stearate 1 ‰, 10761 ‰, and LLDPE powder (melt flow rate 2.0g/10min, density 0.918 g/cm)3)70％。
(2) Then mixing the materials in a high-speed mixer for 4min according to the formula proportion;
(3) the reinforced master batch can be obtained under the conditions of extrusion granulation rotating speed of 55-150 rPm and temperature of 160-190 ℃ in a double-screw extruder.
(4) The heavy packaging film middle layer material is prepared from the following components in parts by weight:
the LLDPE has a melt flow rate of2.0g/10min, density 0.918g/cm3(ii) a The melt flow rate of HDPE was 0.8g/10min, and the density was 0.954g/cm3(ii) a The mLLDPE had a melt flow rate of 1.3g/10min and a density of 0.926g/cm3。
0.1 part by weight of LLDPE; mLLDPE, 0.25 parts by weight; 0.65 part by weight of HDPE; 0.01 part by weight of reinforcing master batch.
(5) Then, mixing the materials in a high-speed mixer for 5min according to the formula proportion;
(6) and (3) blowing the film at the processing temperature of 160-190 ℃ on a film blowing unit with the diameter of the screw rod of 45mm to prepare a test film, and testing.
Example 6
(1) Preparation of the reinforced master batch: weighing appropriate amount of nanoscale pulvis Talci and nanoscale silica respectively 1% and 5%, nanoscale titanium dioxide 24%, calcium stearate or zinc stearate 1 ‰, 10761 ‰, and LLDPE powder (melt flow rate 2.0g/10min, density 0.918 g/cm)3)70％。
(2) Then mixing the materials in a high-speed mixer for 5min according to the formula proportion;
(3) the reinforced master batch can be obtained under the conditions of extrusion granulation rotating speed of 55-150 rPm and temperature of 160-190 ℃ in a double-screw extruder.
(4) The heavy packaging film middle layer material is prepared from the following components in parts by weight:
the LLDPE had a melt flow rate of 2.0g/10min and a density of 0.918g/cm3The HDPE has a melt flow rate of 0.8g/10min and a density of 0.954g/cm3The mLLDPE had a melt flow rate of 1.5g/10min and a density of 0.926g/cm3。
LLDPE 0.15 weight portion, mLLDPE 0.2 weight portion, HDPE 0.65 weight portion, reinforcing mother material 0.01 weight portion.
(5) Then, mixing the materials in a high-speed mixer for 5min according to the formula proportion;
(6) and (3) blowing the film at the processing temperature of 160-190 ℃ on a film blowing machine unit with the diameter of the screw rod of 45mm to prepare a test film for testing.
Example 7
(1) Preparation of the reinforced master batch: weighing appropriate amount of nanoscale pulvis Talci and nanoscale silica respectively 1% and 5%, nanoscale titanium dioxide 24%, calcium stearate or zinc stearate 1 ‰, 10761 ‰, and LLDPE powder (melt flow rate 2.0g/10min, density 0.918 g/cm)3)70％。
(2) Then mixing the materials in a high-speed mixer for 5min according to the formula proportion;
(3) the reinforced master batch can be obtained under the conditions of extrusion granulation rotating speed of 55-150 rPm and temperature of 160-190 ℃ in a double-screw extruder.
(4) The heavy packaging film middle layer material is prepared from the following components in parts by weight:
the LLDPE had a melt flow rate of 2.0g/10min and a density of 0.918g/cm3The HDPE has a melt flow rate of 0.8g/10min and a density of 0.954g/cm3The mLLDPE had a melt flow rate of 1.8g/10min and a density of 0.927g/cm3。
0.1 part by weight of LLDPE; mLLDPE, 0.3 parts by weight; 0.60 part by weight of HDPE; 0.01 weight portion of reinforcing mother.
(5) Then, mixing the materials in a high-speed mixer for 5min according to the formula proportion;
(6) and (3) blowing the film at the processing temperature of 160-190 ℃ on a film blowing machine unit with the diameter of the screw rod of 45mm to prepare a test film for testing.
Example 8
(1) Preparation of the reinforced master batch: weighing appropriate amount of nanoscale pulvis Talci and nanoscale silica respectively 1% and 5%, nanoscale titanium dioxide 24%, calcium stearate or zinc stearate 1 ‰, 10761 ‰, and LLDPE powder (melt flow rate 2.0g/10min, density 0.918 g/cm)3)70％。
(2) Then mixing the materials in a high-speed mixer for 4min according to the formula proportion;
(3) the reinforced master batch can be obtained under the conditions of extrusion granulation rotating speed of 55-150 rPm and temperature of 160-190 ℃ in a double-screw extruder.
(4) The heavy packaging film middle layer material is prepared from the following components in parts by weight:
the LLDPE had a melt flow rate of 2.0g/10min and a density of 0.918g/cm3The HDPE has a melt flow rate of 0.8g/10min and a density of 0.954g/cm3The mLLDPE had a melt flow rate of 1.8g/10min and a density of 0.926g/cm3。
0.15 part by weight of LLDPE; mLLDPE, 0.25 parts by weight; 0.60 part by weight of HDPE; 0.01 part by weight of reinforcing master batch.
(5) Then, mixing the materials in a high-speed mixer for 5min according to the formula proportion;
(6) and (3) blowing the film at the processing temperature of 160-190 ℃ on a film blowing unit with the diameter of the screw rod of 45mm to prepare a test film, and testing.
Example 9
(1) Preparation of the reinforced master batch: weighing appropriate amount of nanoscale pulvis Talci and nanoscale silica respectively 1% and 5%, nanoscale titanium dioxide 24%, calcium stearate or zinc stearate 1 ‰, 10761 ‰, and LLDPE powder (melt flow rate 2.0g/10min, density 0.918 g/cm)3)70％。
(2) Then mixing the materials in a high-speed mixer for 5min according to the formula proportion;
(3) the reinforced master batch can be obtained under the conditions of extrusion granulation rotating speed of 55-150 rPm and temperature of 160-190 ℃ in a double-screw extruder.
(4) The heavy packaging film middle layer material is prepared from the following components in parts by weight:
the LLDPE had a melt flow rate of 2.0g/10min and a density of 0.918g/cm3The HDPE has a melt flow rate of 0.8g/10min and a density of 0.954g/cm3The mLLDPE had a melt flow rate of 1.8g/10min and a density of 0.926g/cm3。
0.1 part by weight of LLDPE; mLLDPE, 0.3 parts by weight; 0.6 part by weight of HDPE; 0.01 part by weight of reinforcing master batch.
(5) Then, mixing the materials in a high-speed mixer for 5min according to the formula proportion;
(6) and (3) blowing the film at the processing temperature of 160-190 ℃ on a film blowing machine unit with the diameter of the screw rod of 45mm to prepare a test film for testing.
Example 10
Preparation of the reinforced master batch: weighing appropriate amount of nanoscale pulvis Talci and nanoscale silica respectively 1% and 5%, nanoscale titanium dioxide 24%, calcium stearate or zinc stearate 1 ‰, 10761 ‰, and LLDPE powder (melt flow rate 2.0g/10min, density 0.918 g/cm)3)70％。
(2) Then mixing the materials in a high-speed mixer for 4min according to the formula proportion;
(3) the reinforced master batch can be obtained under the conditions of extrusion granulation rotating speed of 55-150 rPm and temperature of 160-190 ℃ in a double-screw extruder.
(4) The heavy packaging film middle layer material is prepared from the following components in parts by weight:
the LLDPE had a melt flow rate of 2.0g/10min and a density of 0.918g/cm3The HDPE has a melt flow rate of 0.8g/10min and a density of 0.954g/cm3The mLLDPE had a melt flow rate of 1.8g/10min and a density of 0.926g/cm3。
0.15 weight part of LLDPE; mLLDPE, 0.3 parts by weight; 0.55 part by weight of HDPE; 0.01 part by weight of reinforcing master batch.
(5) Then, mixing the materials in a high-speed mixer for 5min according to the formula proportion;
(6) and (3) blowing the film at the processing temperature of 160-190 ℃ on a film blowing machine unit with the diameter of the screw rod of 45mm to prepare a test film for testing.
Example 11
(1) Preparation of the reinforced master batch: weighing appropriate amount of nanoscale pulvis Talci and nanoscale silica respectively 1% and 5%, nanoscale titanium dioxide 24%, calcium stearate or zinc stearate 1 ‰, 10761 ‰, and LLDPE powder (melt flow rate 2.0g/10min, density 0.918 g/cm)3)70％。
(2) Then mixing the materials in a high-speed mixer for 5min according to the formula proportion;
(3) the reinforced master batch can be obtained under the conditions of extrusion granulation rotating speed of 55-150 rPm and temperature of 160-190 ℃ in a double-screw extruder.
(4) The heavy packaging film middle layer material is prepared from the following components in parts by weight:
the LLDPE had a melt flow rate of 2.0g/10min and a density of 0.918g/cm3The HDPE has a melt flow rate of 1.0g/10min and a density of 0.952g/cm3The mLLDPE had a melt flow rate of 1.8g/10min and a density of 0.927g/cm3。
0.15 part by weight of LLDPE; mLLDPE, 0.15 parts by weight; 0.7 part by weight of HDPE; 0.02 part by weight of reinforcing master batch.
(5) Then, mixing the materials in a high-speed mixer for 5min according to the formula proportion;
(6) and (3) blowing the film on a film blowing machine unit with the screw diameter of 45mm at the film blowing temperature of 169-190 ℃ to prepare a test film for testing.
Example 12
(1) Preparation of the reinforced master batch: weighing appropriate amount of nanoscale pulvis Talci and nanoscale silica respectively 1% and 5%, nanoscale titanium dioxide 24%, calcium stearate or zinc stearate 1 ‰, 10761 ‰, and LLDPE powder (melt flow rate 2.0g/10min, density 0.918 g/cm)3)70％。
(2) Then mixing the materials in a high-speed mixer for 3-5min according to the formula proportion;
(3) the reinforced master batch can be obtained under the conditions of extrusion granulation rotating speed of 55-150 rPm and temperature of 160-190 ℃ in a double-screw extruder.
(4) The heavy packaging film middle layer material is prepared from the following components in parts by weight:
the LLDPE had a melt flow rate of 2.0g/10min and a density of 0.918g/cm3The HDPE has a melt flow rate of 1.0g/10min and a density of 0.953g/cm3The mLLDPE had a melt flow rate of 1.8g/10min and a density of 0.926g/cm3。
0.1 part by weight of LLDPE; mLLDPE, 0.20 parts by weight; 0.7 part by weight of HDPE; 0.02 part by weight of reinforcing master batch.
(5) Then, mixing the materials in a high-speed mixer for 5min according to the formula proportion;
(6) and (3) blowing the film on a film blowing machine unit with the screw diameter of 45mm at the film blowing temperature of 169-190 ℃ to prepare a test film for testing.
Example 13
(1) Preparation of the reinforced master batch: weighing appropriate amount of nanoscale pulvis Talci and nanoscale silica respectively 1% and 5%, nanoscale titanium dioxide 24%, calcium stearate or zinc stearate 1 ‰, 10761 ‰, and LLDPE powder (melt flow rate 2.0g/10min, density 0.918 g/cm)3)70％。
(2) Then mixing the materials in a high-speed mixer for 5min according to the formula proportion;
(3) the reinforced master batch can be obtained under the conditions of extrusion granulation rotating speed of 55-150 rPm and temperature of 160-190 ℃ in a double-screw extruder.
(4) The material for the middle layer of the heavy packaging film is prepared from the following components in parts by weight:
the LLDPE had a melt flow rate of 2.0g/10min and a density of 0.918g/cm3The HDPE has a melt flow rate of 0.8g/10min and a density of 0.954g/cm3The mLLDPE had a melt flow rate of 1.8g/10min and a density of 0.926g/cm3。
0.5 part by weight of LLDPE; mLLDPE, 0.25 parts by weight; 0.7 part by weight of HDPE; 0.02 part by weight of reinforcing master batch.
(5) Then, mixing the materials in a high-speed mixer for 5min according to the formula proportion;
(6) and (3) blowing the film at the processing temperature of 160-190 ℃ on a film blowing machine unit with the diameter of the screw rod of 45mm to prepare a test film for testing.
Example 14
(1) Preparation of the reinforced master batch: weighing appropriate amount of nanoscale pulvis Talci and nanoscale silica respectively 1% and 5%, nanoscale titanium dioxide 24%, calcium stearate or zinc stearate 1 ‰, 10761 ‰, and LLDPE powder (melt flow rate 2.0g/10min, density 0.918 g/cm)3)70％。
(2) Then mixing the materials in a high-speed mixer for 5min according to the formula proportion;
(3) the reinforced master batch can be obtained under the conditions of extrusion granulation rotating speed of 55-150 rPm and temperature of 160-190 ℃ in a double-screw extruder.
(4) The middle layer material of the heavy packaging film can be obtained by blending the following materials in parts by weight:
the LLDPE had a melt flow rate of 2.0g/10min and a density of 0.918g/cm3The HDPE has a melt flow rate of 0.8g/10min and a density of 0.954g/cm3The mLLDPE had a melt flow rate of 1.8g/10min and a density of 0.927g/cm3。
0.05 part by weight of LLDPE; mLLDPE, 0.3 parts by weight; 0.65 parts by weight of HDPE; 0.02 part by weight of reinforcing master batch.
(5) Then, mixing the materials in a high-speed mixer for 5min according to the formula proportion;
(6) and (3) blowing the film at the processing temperature of 160-190 ℃ on a film blowing unit with the diameter of the screw rod of 45mm to prepare a test film, and testing.
Example 15
(1) Preparation of the reinforced master batch: weighing appropriate amount of nanoscale pulvis Talci and nanoscale silica respectively 1% and 5%, nanoscale titanium dioxide 24%, calcium stearate or zinc stearate 1 ‰, 10761 ‰, and LLDPE powder (melt flow rate 2.0g/10min, density 0.918 g/cm)3)70％。
(2) Then mixing the materials in a high-speed mixer for 5min according to the formula proportion;
(3) the reinforced master batch can be obtained under the conditions of extrusion granulation rotating speed of 55-150 rPm and temperature of 160-190 ℃ in a double-screw extruder.
(4) The heavy packaging film middle layer material is prepared from the following components in parts by weight:
the LLDPE had a melt flow rate of 2.0g/10min and a density of 0.918g/cm3The HDPE has a melt flow rate of 1.0g/10min and a density of 0.954g/cm3The mLLDPE had a melt flow rate of 1.8g/10min and a density of 0.926g/cm3。
LLDPE, 0.1 weight part, mLLDPE, 0.25 weight part, HDPE, 0.65 weight part, reinforcing master batch, 0.02 weight part.
(5) Then, mixing the materials in a high-speed mixer for 5min according to the formula proportion;
(6) and (3) blowing the film at the processing temperature of 160-190 ℃ on a film blowing machine unit with the diameter of the screw rod of 45mm to prepare a test film for testing.
Example 16
(1) Preparation of the reinforced master batch: weighing appropriate amount of nanoscale pulvis Talci and nanoscale silica respectively 1% and 5%, nanoscale titanium dioxide 24%, calcium stearate or zinc stearate 1 ‰, 10761 ‰, and LLDPE powder (melt flow rate 2.0g/10min, density 0.918 g/cm)3)70％。
(2) Then mixing the materials in a high-speed mixer for 5min according to the formula proportion;
(3) the reinforced master batch can be obtained under the conditions of extrusion granulation rotating speed of 55-150 rPm and temperature of 160-190 ℃ in a double-screw extruder.
(4) The heavy packaging film middle layer material is prepared from the following components in parts by weight:
the LLDPE had a melt flow rate of 2.0g/10min and a density of 0.918g/cm3The HDPE has a melt flow rate of 0.8g/10min and a density of 0.954g/cm3The mLLDPE had a melt flow rate of 1.3g/10min and a density of 0.926g/cm3。
LLDPE 0.15 weight portion, mLLDPE 0.2 weight portion, HDPE 0.65 weight portion, reinforcing mother material 0.01 weight portion.
(5) Then, mixing the materials in a high-speed mixer for 5min according to the formula proportion;
(6) and (3) blowing the film at the processing temperature of 160-190 ℃ on a film blowing machine unit with the diameter of the screw rod of 45mm to prepare a test film for testing.
Example 17
(1) Preparation of the reinforced master batch: weighing appropriate amount of nanoscale talcum powder and nanoscale silicon dioxide respectively 1% and 5%, nanoscale titanium dioxide 24%, calcium stearate or zinc stearate 1 ‰, 10761 ‰, and LLDPE powder (melt flow rate 2.0g/10min, density 0.918 g/cm)3)70％。
(2) Then mixing the materials in a high-speed mixer for 5min according to the formula proportion;
(3) the reinforced master batch can be obtained under the conditions of extrusion granulation rotating speed of 55-150 rPm and temperature of 160-190 ℃ in a double-screw extruder.
(4) The heavy packaging film middle layer material is prepared from the following components in parts by weight:
the LLDPE had a melt flow rate of 2.0g/10min and a density of 0.918g/cm3The HDPE has a melt flow rate of 0.8g/10min and a density of 0.954g/cm3The mLLDPE had a melt flow rate of 1.3g/10min and a density of 0.926g/cm3。
0.1 part by weight of LLDPE, 0.3 part by weight of mLLDPE, 0.60 part by weight of HDPE, and 0.02 part by weight of reinforcing master batch.
(5) Then, mixing the materials in a high-speed mixer for 5min according to the formula proportion;
(6) and (3) blowing the film at the processing temperature of 160-190 ℃ on a film blowing machine unit with the diameter of the screw rod of 45mm to prepare a test film for testing.
Example 18
(1) Preparation of the reinforced master batch: weighing appropriate amount of nanoscale pulvis Talci and nanoscale silica respectively 1% and 5%, nanoscale titanium dioxide 24%, calcium stearate or zinc stearate 1 ‰, 10761 ‰, and LLDPE powder (melt flow rate 2.0g/10min, density 0.918 g/cm)3)70％。
(2) Then mixing the materials in a high-speed mixer for 4min according to the formula proportion;
(3) the reinforced master batch can be obtained under the conditions of extrusion granulation rotating speed of 55-150 rPm and temperature of 160-190 ℃ in a double-screw extruder.
(4) The heavy packaging film middle layer material is prepared from the following components in parts by weight:
the LLDPE had a melt flow rate of 2.0g/10min and a density of 0.918g/cm3The HDPE has a melt flow rate of 0.8g/10min and a density of 0.954g/cm3The mLLDPE had a melt flow rate of 1.3g/10min and a density of 0.926g/cm3。
0.15 part by weight of LLDPE; mLLDPE, 0.25 parts by weight; 0.60 part by weight of HDPE; 0.02 part by weight of reinforcing master batch.
(5) Then, mixing the materials in a high-speed mixer for 5min according to the formula proportion;
(6) and (3) blowing the film on a film blowing machine unit with the screw diameter of 45mm at the processing temperature of 160-190 ℃ to prepare a test film for testing.
Example 19
(1) Preparation of the reinforced master batch: weighing appropriate amount of nanoscale pulvis Talci and nanoscale silica respectively 1% and 5%, nanoscale titanium dioxide 24%, calcium stearate or zinc stearate 1 ‰, 10761 ‰, and LLDPE powder (melt flow rate 2.0g/10min, density 0.918 g/cm)3)70％。
(2) Then mixing the materials in a high-speed mixer for 5min according to the formula proportion;
(3) the reinforced master batch can be obtained under the conditions of extrusion granulation rotating speed of 55-150 rPm and temperature of 160-190 ℃ in a double-screw extruder.
(4) The heavy packaging film middle layer material is prepared from the following components in parts by weight:
the LLDPE had a melt flow rate of 2.0g/10min and a density of 0.918g/cm3The HDPE has a melt flow rate of 0.8g/10min and a density of 0.954g/cm3The mLLDPE had a melt flow rate of 1.3g/10min and a density of 0.926g/cm3。
0.1 part by weight of LLDPE; mLLDPE, 0.3 parts by weight; 0.6 part by weight of HDPE; 0.01 part by weight of reinforcing master batch.
(5) Then, mixing the materials in a high-speed mixer for 5min according to the formula proportion;
(6) and (3) blowing the film on a film blowing machine unit with the screw diameter of 45mm at the processing temperature of 160-190 ℃ to prepare a test film for testing.
Example 20
(1) Preparation of reinforced master batch by weighing appropriate amount of nano-scale lubricantThe stone powder and the nano-scale silicon dioxide are respectively 1 percent and 5 percent, the nano-scale titanium dioxide is 24 percent, calcium stearate or zinc stearate is 1 per mill and 10761 per mill, LLDPE powder (the melt flow rate is 2.0g/10min, and the density is 0.918g/cm3)70％。
(2) Then mixing the materials in a high-speed mixer for 5min according to the formula proportion;
(3) the reinforced master batch can be obtained under the conditions of extrusion granulation rotating speed of 55-150 rPm and temperature of 160-190 ℃ in a double-screw extruder.
(4) The heavy packaging film middle layer material is prepared from the following components in parts by weight:
the LLDPE had a melt flow rate of 2.0g/10min and a density of 0.918g/cm3The HDPE has a melt flow rate of 0.8g/10min and a density of 0.954g/cm3The mLLDPE had a melt flow rate of 1.3g/10min and a density of 0.926g/cm3。
0.15 part by weight of LLDPE; mLLDPE, 0.3 parts by weight; 0.55 part by weight of HDPE; 0.02 part by weight of reinforcing master batch.
(5) Then, mixing the materials in a high-speed mixer for 5min according to the formula proportion;
(6) and (3) blowing the film on a film blowing machine unit with the screw diameter of 45mm at the processing temperature of 160-190 ℃ to prepare a test film for testing.
Comparative example 1
(1) According to the method of the embodiment 1, the material is prepared from the following components in parts by weight:
the LLDPE had a melt flow rate of 2.0g/10min and a density of 0.918g/cm3(ii) a The melt flow rate of HDPE was 0.8g/10min, and the density was 0.954g/cm3(ii) a The mLLDPE had a melt flow rate of 1.3g/10min and a density of 0.926g/cm3。
0.15 part by weight of LLDPE; mLLDPE, 0.15 parts by weight; HDPE, 0.7 parts by weight.
(2) Mixing the above materials in a high-speed mixer for 5 min;
(3) and blowing the film on a film blowing machine unit with the diameter of the screw rod of 45mm at the film blowing temperature of 169-190 ℃ to prepare a test film for testing.
TABLE 1 analysis results of mechanical properties of examples and comparative examples
Figure BDA0002809578170000181
Figure BDA0002809578170000191
Table 2 analysis results of basic properties of examples and comparative examples
Figure BDA0002809578170000192
It can be seen from the experimental results in tables 1 and 2 that, in the examples 1 to 20, compared with the comparative example 1, the reinforcing master batch is added to the examples to generate micro-crosslinking after melt blending, a steel skeleton structure is formed in a molecular chain, the strength of the special material in the middle layer of the heavy package is improved, the tensile strength, the tear strength and the falling mark impact strength of the film are higher, and the effects of toughening and reinforcing are obvious.
The four raw materials in the utility model have good compatibility and exert the advantages thereof respectively, so that the middle layer material of the heavy packaging film has high strength and good toughness, and completely meets the use requirement of the heavy packaging film.
The present invention is capable of other embodiments, and various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the utility model as defined in the appended claims.

Claims (9)

1. A repackaging film-in-film composite comprising:
linear low density polyethylene: 0.05-0.15 weight part;
high density polyethylene: 0.5-0.7 weight parts;
metallocene polyethylene: 0.1-0.3 weight parts; and
reinforcing master batch: 0.01-0.02 weight parts;
the reinforced master batch comprises the components of nano-scale talcum powder, nano-scale silicon dioxide and nano-scale titanium dioxide.
2. The middle layer composite of heavy packaging film as claimed in claim 1, wherein the density of the middle layer composite of heavy packaging film is 0.935-0.940g/cm3。
3. The repackaging film layer composite of claim 1 wherein the linear low density polyethylene has a density of 0.918-0.922g/cm3The melt flow rate is from 1.7 to 2.3g/10min, preferably from 1.8 to 2.0g/10 min.
4. The repackaging film layer composite of claim 1 wherein the high density polyethylene has a density of 0.949 to 0.955g/cm3The melt flow rate is from 0.6 to 1.0g/10min, preferably from 0.8 to 1.0g/10 min.
5. The middle layer composite of heavy packaging film as claimed in claim 1, wherein the metallocene polyethylene has a density of 0.924 to 0.929g/cm3The melt flow rate is from 1.3 to 1.8g/10min, preferably from 1.5 to 1.8g/10 min.
6. The mid-layer composite of repackaging film of claim 1 wherein the components of said reinforcing masterbatch further comprise a linear low density polyethylene powder, and calcium stearate or zinc stearate; the linear low density polyethylene powder has a density of 0.917-0.923g/cm3The melt flow rate is 1.5-2.5g/10 min.
7. The middle layer composite material of the heavy packaging film as claimed in claim 6, wherein the reinforcing master batch comprises 1 wt% of nano-scale talcum powder, 5 wt% of nano-scale silicon dioxide, 20 wt% -25 wt% of nano-scale titanium dioxide, 1 wt% of calcium stearate or 10761 wt% of zinc stearate, and 70 wt% of linear low density polyethylene powder.
8. The repackaged film sandwich composite of claim 1, wherein the repackaged film sandwich composite comprises:
linear low density polyethylene: 0.05-0.10 weight part;
high density polyethylene: 0.55-0.65 weight parts;
metallocene polyethylene: 0.25-0.3 weight parts; and
reinforcing master batch: 0.01 weight portion.
9. A method of making a repackaging film sandwich composite as in any of claims 1-8, comprising the steps of:
(1) preparation of the reinforced master batch: weighing 1 wt% of nano-scale talcum powder, 5 wt% of nano-scale silicon dioxide, 20 wt% -25 wt% of nano-scale titanium dioxide, 1 wt% of calcium stearate or 1 wt% of zinc stearate, and 70 wt% of linear low-density polyethylene powder; mixing for 3-5min in a high-speed mixer, and then performing extrusion granulation in a double-screw extruder at the screw rotating speed of 55-150 rPm and the temperature of 160-190 ℃ to obtain reinforced master batch;
(2) weighing 0.05-0.15 part by weight of linear low-density polyethylene, 0.5-0.7 part by weight of high-density polyethylene, 0.1-0.3 part by weight of metallocene polyethylene and 0.01-0.02 part by weight of the reinforced master batch in the step (1);
(3) and (3) mixing the materials in the step (2) in a high-speed mixer for 3-5min, and placing the mixture in a film blowing machine at the temperature of 160-190 ℃ for film blowing to obtain the intermediate-layer composite material of the heavy packaging film.
CN202011385539.5A 2020-12-01 2020-12-01 Middle layer composite material of heavy packaging film and preparation method thereof Pending CN114573893A (en)

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