CN110254012B - Preparation method of hydrophobic three-layer co-extrusion composite film - Google Patents

Preparation method of hydrophobic three-layer co-extrusion composite film Download PDF

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CN110254012B
CN110254012B CN201910658103.XA CN201910658103A CN110254012B CN 110254012 B CN110254012 B CN 110254012B CN 201910658103 A CN201910658103 A CN 201910658103A CN 110254012 B CN110254012 B CN 110254012B
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layer
parts
density polyethylene
temperature
zone
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CN110254012A (en
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吕江鹏
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Fujian Kaian Packaging Technology Co ltd
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Fujian Kaian Packaging Technology Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/327—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polyolefins obtained by a metallocene or single-site catalyst
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • 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
    • B65D65/40—Applications of laminates for particular packaging purposes
    • 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
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/001—Tubular films, sleeves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558—Impact strength, toughness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/73—Hydrophobic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging
    • 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
    • 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
    • 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
    • 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
    • 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
    • C08J2423/10—Homopolymers or copolymers of propene
    • C08J2423/12—Polypropene
    • 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
    • C08J2453/00—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
    • 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
    • C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2467/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • 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
    • C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2467/06—Unsaturated polyesters
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    • C08J2477/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
    • C08J2477/06—Polyamides derived from polyamines and polycarboxylic acids

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  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Laminated Bodies (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Wrappers (AREA)

Abstract

The invention discloses a preparation method of a hydrophobic three-layer co-extrusion composite film, wherein the inner layer comprises 30-40 parts of first metallocene linear low-density polyethylene, 10-20 parts of ethylene-octene segmented copolymer, 10-30 parts of first high-density polyethylene, 10-30 parts of first low-density polyethylene, 10-20 parts of first ethylene-vinyl acetate copolymer and 5-15 parts of polypropylene toughening agent; the middle layer comprises 40-60 parts of second metallocene linear low-density polyethylene, 20-30 parts of second high-density polyethylene and 10-20 parts of polypropylene; the outer layer comprises 30-40 parts of medium density polyethylene, 20-40 parts of second low density polyethylene and 20-30 parts of polybutylene terephthalate. The invention can achieve the purpose that the hydrophobic three-layer co-extrusion composite film is not easy to be damaged.

Description

Preparation method of hydrophobic three-layer co-extrusion composite film
Technical Field
The invention relates to the technical field of films, in particular to a preparation method of a hydrophobic three-layer co-extrusion composite film.
Background
The food is safe and the food package is safe and inseparable. The packaging plays an irreplaceable role in providing protection to the food, preventing the food from being polluted by external microorganisms or other substances, preventing or reducing food oxidation and other reactions, and is an important means for food preservation. At present, a hydrophobic three-layer co-extrusion composite film is widely applied to the field of food packaging, but the existing hydrophobic three-layer co-extrusion composite film is easy to break in application.
Disclosure of Invention
The invention aims to provide a hydrophobic three-layer co-extrusion composite film, and aims to solve the technical problem that the hydrophobic three-layer co-extrusion composite film in the prior art is easy to damage in application.
In order to achieve the purpose, the hydrophobic three-layer co-extrusion composite film adopted by the invention comprises the following raw materials in parts by mass: an inner layer, an intermediate layer and an outer layer;
the inner layer comprises 30-40 parts of first metallocene linear low-density polyethylene, 10-20 parts of ethylene-octene block copolymer, 10-30 parts of first high-density polyethylene, 10-30 parts of first low-density polyethylene, 10-20 parts of first ethylene-vinyl acetate copolymer and 5-15 parts of polypropylene toughening agent;
the middle layer comprises 40-60 parts of second metallocene linear low-density polyethylene, 20-30 parts of second high-density polyethylene and 10-20 parts of polypropylene;
the outer layer comprises 30-40 parts of medium density polyethylene, 20-40 parts of second low density polyethylene and 20-30 parts of polybutylene terephthalate;
weighing a first metallocene linear low-density polyethylene, an ethylene-octene block copolymer, a first high-density polyethylene, a first low-density polyethylene, a first ethylene-vinyl acetate copolymer and a polypropylene toughening agent according to a formula ratio, and then placing the materials into a first stirrer for mixing; metering a second metallocene linear low-density polyethylene, a second high-density polyethylene and polypropylene according to a formula ratio, and mixing in a second stirrer; metering medium-density polyethylene, second low-density polyethylene and polybutylene terephthalate according to a formula proportion, and mixing in a third stirrer;
the materials mixed in the first stirrer, the second stirrer and the third stirrer are sequentially placed in hoppers of three corresponding three-layer co-extrusion blow molding machine sets respectively, are conveyed to a die head through a screen changing mechanism and a material pipe, and are extruded through the die head and then are stretched to form the inner layer, the middle layer and the outer layer respectively;
blowing cooling air by a fan to blow and expand the film tube into film bubbles, cooling the film bubbles by a cooling air ring and a film bubble internal cooling system, treating the film bubbles by a drafting device and a corona processor, and then feeding the film bubbles into a winding device;
and the rolling device rolls the cooled film bubble to obtain the hydrophobic three-layer co-extrusion composite film.
The inner layer further comprises a first adhesive, the mass part of the first adhesive is 5-15 parts, and the first adhesive is an ethylene acrylic acid copolymer.
The middle layer further comprises a third metallocene linear low-density polyethylene, and the mass part of the third metallocene linear low-density polyethylene is 10-20 parts.
The outer layer further comprises PA66 polyamide resin, and the PA66 polyamide resin accounts for 10-20 parts by mass.
The outer layer further comprises unsaturated polyester resin, and the mass part of the unsaturated polyester resin is 5-15 parts.
The outer layer further comprises a second ethylene-vinyl acetate copolymer, and the mass part of the second ethylene-vinyl acetate copolymer is 10-20 parts.
The outer layer further comprises a second adhesive, the mass part of the second adhesive is 5-15 parts, and the second adhesive is ethylene-methyl acrylate-glycidyl methacrylate.
Wherein the rotating speed of the first stirrer is 300-400 r/min, the temperature is 90-100 ℃, and the mixing time is 8-10 min;
the rotating speed of the second stirrer is 350-450 r/min, the temperature is 80-100 ℃, and the mixing time is 6-10 min;
the rotating speed of the third stirrer is 200-400 r/min, the temperature is 95-115 ℃, and the mixing time is 8-12 min.
Wherein, the hopper temperature of the three-layer co-extrusion blow molding unit corresponding to the first stirrer: the temperature of the first zone is 140-150 ℃, the temperature of the second zone is 155-165 ℃, the temperature of the third zone is 160-170 ℃, the temperature of the fourth zone is 140-160 ℃, and the temperature of the fifth zone is 150-160 ℃;
and the hopper temperature of the three-layer co-extrusion blow molding unit corresponding to the second stirrer is as follows: the temperature of the first zone is 130-150 ℃, the temperature of the second zone is 145-165 ℃, the temperature of the third zone is 150-170 ℃, the temperature of the fourth zone is 150-160 ℃, and the temperature of the fifth zone is 155-165 ℃;
and the temperature of a hopper of the three-layer co-extrusion blow molding unit corresponding to the third stirrer is as follows: the temperature of the first zone is 130-140 ℃, the temperature of the second zone is 150-160 ℃, the temperature of the third zone is 150-160 ℃, the temperature of the fourth zone is 140-160 ℃, and the temperature of the fifth zone is 150-160 ℃.
Wherein the temperature of the die head is 230-240 ℃.
The preparation method of the hydrophobic three-layer co-extrusion composite film comprises the following steps of enabling the inner layer to comprise 30-40 parts of first metallocene linear low-density polyethylene, 10-20 parts of ethylene-octene segmented copolymer, 10-30 parts of first high-density polyethylene, 10-30 parts of first low-density polyethylene, 10-20 parts of first ethylene-vinyl acetate copolymer and 5-15 parts of polypropylene toughening agent; the middle layer comprises 40-60 parts of second metallocene linear low-density polyethylene, 20-30 parts of second high-density polyethylene and 10-20 parts of polypropylene; the outer layer comprises 30-40 parts of medium density polyethylene, 20-40 parts of second low density polyethylene and 20-30 parts of polybutylene terephthalate; weighing a first metallocene linear low-density polyethylene, an ethylene-octene block copolymer, a first high-density polyethylene, a first low-density polyethylene, a first ethylene-vinyl acetate copolymer and a polypropylene toughening agent according to a formula ratio, and then placing the materials into a first stirrer for mixing; metering a second metallocene linear low-density polyethylene, a second high-density polyethylene and polypropylene according to a formula ratio, and mixing in a second stirrer; metering medium-density polyethylene, second low-density polyethylene and polybutylene terephthalate according to a formula proportion, and mixing in a third stirrer; the materials mixed in the first stirrer, the second stirrer and the third stirrer are sequentially placed in hoppers of three corresponding three-layer co-extrusion blow molding machine sets respectively, are conveyed to a die head through a screen changing mechanism and a material pipe, and are extruded through the die head and then are stretched to form the inner layer, the middle layer and the outer layer respectively; blowing cooling air by a fan to blow and expand the film tube into film bubbles, cooling the film bubbles by a cooling air ring and a film bubble internal cooling system, treating the film bubbles by a drafting device and a corona processor, and then feeding the film bubbles into a winding device; and the rolling device rolls the cooled film bubble to obtain the hydrophobic three-layer co-extrusion composite film. The material and the components of the inner layer, the material and the components of the middle layer, and the material and the components of the outer layer are changed to increase the toughness and the strength of the hydrophobic three-layer co-extruded composite film, so that the hydrophobic three-layer co-extruded composite film is not easy to damage.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method of making a hydrophobic three-layer coextruded composite film of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The invention provides a preparation method of a hydrophobic three-layer co-extrusion composite film, wherein the melt flow rates of a first metallocene linear low-density polyethylene and a second metallocene linear low-density polyethylene are both 1.0-3.0 g/10min, the density is 0.942-0.962 g/cc, the melt flow rate of an ethylene-octene block copolymer is 4.6-4.8 g/10min, the density is 0.888-0.900 g/cc, the melt flow rates of a first high-density polyethylene and a second high-density polyethylene are both 1.0-2.0 g/10min, the density is 0.942-0.962 g/cc, the melt flow rates of the first low-density polyethylene and the second low-density polyethylene are both 2.0-6.0 g/10min, the density is 0.95-0.96 g/cc, the melt flow rate of a medium-density polyethylene is 2.0-3.0 g/10min, and the density is 0.94-0.95 g/cc, the first adhesive is ethylene acrylic acid copolymer, the second adhesive is ethylene-methyl acrylate-glycidyl methacrylate, and the polybutylene terephthalate is a polycondensate of terephthalic acid and 1, 4-butanediol. Please refer to fig. 1:
example 1
As shown in fig. 1, table 2, table 3 and table 10:
TABLE 1 quality of composition, melt flow rate and density of example 1
Figure BDA0002137519420000051
TABLE 2 rotational speed, temperature and mixing time of the first, second and third mixers of example 1
Rotational speed r/min Temperature of Mixing time min
First mixer 300 90 8
Second mixer 350 80 6
Third mixer 200 95 8
TABLE 3 hopper temperature of units corresponding to the first, second and third mixers of example 1
Figure BDA0002137519420000061
S100: and (2) metering the materials of the inner layer, the middle layer and the outer layer according to the formula proportion:
the inner layer comprises 30 parts of first metallocene linear low density polyethylene, the melt flow rate is 1.0g/10min, and the density is 0.942 g/cc; 10 parts of an ethylene-octene block copolymer, having a melt flow rate of 4.6g/10min and a density of 0.888 g/cc; 10 parts of first high-density polyethylene, the melt flow rate is 1.0g/10min, and the density is 0.942 g/cc; 10 parts of first low-density polyethylene, wherein the melt flow rate is 2.0g/10min, and the density is 0.95 g/cc; 10 parts of a first ethylene-vinyl acetate copolymer, 5 parts of a polypropylene toughening agent and 5 parts of a first adhesive;
the middle layer comprises 40 parts of second metallocene linear low density polyethylene, the melt flow rate is 1.0g/10min, and the density is 0.942 g/cc; 20 parts of second high-density polyethylene, the melt flow rate is 1.0g/10min, and the density is 0.942 g/cc; 10 parts of polypropylene and 10 parts of third metallocene linear low-density polyethylene;
the outer layer comprises 30 parts of medium density polyethylene, the melt flow rate is 2.0g/10min, the density is 0.94g/cc, 20 parts of second low density polyethylene, the melt flow rate is 2.0g/10min, and the density is 0.95 g/cc; 20 parts of polybutylene terephthalate, 10 parts of PA66 polyamide resin, 5 parts of unsaturated polyester resin, 10 parts of second ethylene-vinyl acetate copolymer and 5 parts of second adhesive.
Wherein the inner layer takes the first metallocene linear low density polyethylene as a main body, the first metallocene linear low density polyethylene has certain strength per se, so that the strength of the inner layer is improved, and the flexibility and the right-angle tear strength of the inner layer can be obviously improved by matching with the ethylene-octene block copolymer, and meanwhile, the oxygen transmission amount of the inner layer is less than 0.8cm3/m224 h.0.1 MP, water vapor transmission less than 0.6cm3/m224h, certain hydrophobicity is achieved, the first high-density polyethylene is matched, the strength of the inner layer can be further enhanced, the puncture resistance of the inner layer can be improved by blending with the first low-density polyethylene, the EVA ethylene-vinyl acetate copolymer has certain elasticity, the abrasion resistance and the toughness of the inner layer can be improved by adding the EVA ethylene-vinyl acetate copolymer, the strength of the inner layer can be further improved by matching with the polypropylene toughening agent, and when the inner layer of the hydrophobic three-layer co-extrusion composite film is rubbed with an object under the action of external force, the hydrophobic three-layer co-extrusion composite film is enabled to be matched with the polypropylene toughening agent, so that the hydrophobic three-layer co-extrusion composite film is obtainedThe composite film is not easy to be damaged;
meanwhile, the addition of the medium density polyethylene can improve the strength of the outer layer and adjust the processability of the outer layer to a certain degree, the second low density polyethylene is mixed with the medium density polyethylene, which can improve the puncture resistance of the outer layer, and the outer layer has good fluidity, easy casting and film forming, good temperature resistance and high mechanical strength by matching with the polybutylene terephthalate, and mixed with PA66 polyamide resin, the strength and rigidity of the outer layer can be effectively improved, meanwhile, the strength and rigidity of the outer layer can be further improved by increasing the unsaturated polyester resin, and the second ethylene-vinyl acetate copolymer is matched, the second ethylene-vinyl acetate copolymer has certain elasticity, so that the outer layer has good toughness and impact resistance, and the hydrophobic three-layer co-extruded composite film is not easily scratched even under the action of external force;
meanwhile, the second metallocene linear low-density polyethylene has certain strength, so that the strength of the middle layer is improved, the second high-density polyethylene is matched to further enhance the strength of the middle layer, in addition, the polypropylene is mixed with the second metallocene linear low-density polyethylene to convert the structure of the middle layer into PE, so that the toughness of the middle layer is improved, the hydrophobic three-layer co-extrusion composite film is not easy to damage by matching with the inner layer and the outer layer, meanwhile, the connection strength between the middle layer and the inner layer and the outer layer can be improved by adding the third metallocene linear low-density polyethylene, and the connection strength between the middle layer and the inner layer and the outer layer can be further enhanced by matching with the first adhesive and the second adhesive, even after the hydrophobic three-layer co-extrusion composite film is used for too long time, the hydrophobic three-layer co-extrusion composite film is not easy to be damaged due to the fact that the structure between two adjacent layers is not easy to separate.
S200: weighing a first metallocene linear low-density polyethylene, an ethylene-octene block copolymer, a first high-density polyethylene, a first low-density polyethylene, a first ethylene-vinyl acetate copolymer and a polypropylene toughening agent according to a formula ratio, and then placing the materials into a first stirrer for mixing; metering a second metallocene linear low-density polyethylene, a second high-density polyethylene and polypropylene according to a formula ratio, and mixing in a second stirrer; metering medium-density polyethylene, second low-density polyethylene and polybutylene terephthalate according to a formula proportion, and mixing in a third stirrer;
wherein the rotation speed of the first stirrer is 300r/min, the temperature is 90 ℃, and the mixing time is 8 min; the rotation speed of the second stirrer is 350r/min, the temperature is 80 ℃, and the mixing time is 6 min; the rotating speed of the third stirrer is 200r/min, the temperature is 95 ℃, the mixing time is 8min, the positions of the first stirrer, the second stirrer and the third stirrer are different, and the first stirrer is used for fully mixing the raw materials for preparing the inner layer according to the formula proportion and uniformly stirring; the second stirrer is used for fully mixing the raw materials for preparing the middle layer according to the formula proportion and stirring uniformly; the third stirrer is used for fully mixing the raw materials for preparing the outer layer according to the formula proportion and stirring uniformly; and further the performance of the manufactured hydrophobic three-layer co-extrusion composite film is more excellent.
S300: the materials mixed in the first stirrer, the second stirrer and the third stirrer are sequentially placed in hoppers of three corresponding three-layer co-extrusion blow molding machine sets respectively, are conveyed to a die head through a screen changing mechanism and a material pipe, and are extruded through the die head and then are stretched to form the inner layer, the middle layer and the outer layer respectively;
wherein the first mixer will stir and mix the completion the raw materials of inlayer transmit to the hopper of the three-layer co-extrusion blow molding unit that corresponds with it in, and the hopper temperature of the three-layer co-extrusion blow molding unit that corresponds with first mixer: 140 ℃ in the first area, 155 ℃ in the second area, 160 ℃ in the third area, 140 ℃ in the fourth area and 150 ℃ in the fifth area; the second mixer is used for mixing the raw materials in the middle layer, and the raw materials are conveyed to the hopper of the three-layer co-extrusion blow molding machine set corresponding to the second mixer, and the hopper temperature of the three-layer co-extrusion blow molding machine set corresponding to the second mixer is as follows: the first zone is 130 ℃, the second zone is 145 ℃, the third zone is 150 ℃, the fourth zone is 150 ℃ and the fifth zone is 155 ℃; the third mixer will stir and mix the completion during outer raw materials transmission to the hopper of the three-layer co-extrusion blow molding unit that corresponds with it, and the hopper temperature of the three-layer co-extrusion blow molding unit that corresponds with the third mixer: 130 ℃ in the first zone, 150 ℃ in the second zone, 150 ℃ in the third zone, 140 ℃ in the fourth zone and 150 ℃ in the fifth zone. The raw material mixture in the hopper of each three-layer co-extrusion blow molding machine set is fully mixed, then is sent to a die head through a corresponding screen changing mechanism and a material pipe, and is extruded by the die head and then is stretched to form the inner layer, the middle layer and the outer layer, wherein the temperature of the die head is 230 ℃, and the die head temperature is set so that the prepared outer layer, the middle layer and the inner layer have better performances in various aspects such as strength and toughness.
S400: blowing cooling air by a fan to blow and expand the film tube into film bubbles, cooling the film bubbles by a cooling air ring and a film bubble internal cooling system, treating the film bubbles by a drafting device and a corona processor, and then feeding the film bubbles into a winding device;
and cooling air is blown into the film tube by the electrified fan, the film tube is blown into a film bubble, the blowing-up ratio is 3, and the film bubble enters a winding device after being cooled by an external cooling air ring and a film bubble internal cooling system and treated by a drafting device and a corona processor.
S500: and the rolling device rolls the cooled film bubble to obtain the hydrophobic three-layer co-extrusion composite film.
And rolling the cooled film bubble by using a rolling device to obtain the hydrophobic three-layer co-extrusion composite film with the inner layer, the middle layer and the outer layer.
Example 2
As shown in fig. 1, table 4, table 5, table 6 and table 10:
table 4 composition quality, melt flow rate and density of example 2
Figure BDA0002137519420000091
TABLE 5 rotational speed, temperature and mixing time of the first, second and third mixers of example 2
Rotational speed r/min Temperature of Mixing time min
First mixer 350 95 9
Second mixer 400 90 8
Third mixer 300 105 10
TABLE 6 hopper temperature of the unit corresponding to the first, second and third mixers of example 2
Figure BDA0002137519420000101
S100: and (2) metering the materials of the inner layer, the middle layer and the outer layer according to the formula proportion:
the inner layer comprises 35 parts of first metallocene linear low density polyethylene, the melt flow rate is 2.0g/10min, and the density is 0.952 g/cc; 15 parts of an ethylene-octene block copolymer, having a melt flow rate of 4.7g/10min and a density of 0.889 g/cc; 20 parts of first high-density polyethylene, the melt flow rate of which is 1.5g/10min, and the density of which is 0.952 g/cc; 20 parts of first low-density polyethylene, wherein the melt flow rate is 4.0g/10min and the density is 0.955 g/cc; 15 parts of a first ethylene-vinyl acetate copolymer, 10 parts of a polypropylene toughening agent and 10 parts of a first adhesive;
the middle layer comprises 50 parts of second metallocene linear low density polyethylene, the melt flow rate is 2.0g/10min, and the density is 0.952 g/cc; 25 parts of second high-density polyethylene, the melt flow rate of which is 1.5g/10min and the density of which is 0.952 g/cc; 15 parts of polypropylene and 15 parts of third metallocene linear low-density polyethylene;
the outer layer comprises 35 parts of medium density polyethylene with a melt flow rate of 2.5g/10min and a density of 0.945g/cc, 30 parts of second low density polyethylene with a melt flow rate of 4.0g/10min and a density of 0.955 g/cc; 25 parts of polybutylene terephthalate, 15 parts of PA66 polyamide resin, 10 parts of unsaturated polyester resin, 15 parts of second ethylene-vinyl acetate copolymer and 10 parts of second adhesive.
Wherein the inner layer takes the first metallocene linear low density polyethylene as a main body, the first metallocene linear low density polyethylene has certain strength per se, so that the strength of the inner layer is improved, and the flexibility and the right-angle tear strength of the inner layer can be obviously improved by matching with the ethylene-octene block copolymer, and meanwhile, the oxygen transmission amount of the inner layer is less than 0.8cm3/m224 h.0.1 MP, water vapor transmission less than 0.6cm3/m224h, certain hydrophobicity is achieved, the strength of the inner layer can be further enhanced by matching with the first high-density polyethylene, the puncture resistance of the inner layer can be improved by blending with the first low-density polyethylene, the EVA ethylene-vinyl acetate copolymer has certain elasticity, the wear resistance and toughness of the inner layer can be improved by adding the EVA ethylene-vinyl acetate copolymer, and the wear resistance and toughness of the inner layer can be further improved by matching with the polypropylene toughening agentThe strength is improved, and the hydrophobic three-layer co-extruded composite film is not easy to damage when the inner layer of the hydrophobic three-layer co-extruded composite film is rubbed with an object under the action of external force by improving the wear resistance, toughness and strength of the inner layer;
meanwhile, the addition of the medium density polyethylene can improve the strength of the outer layer and adjust the processability of the outer layer to a certain degree, the second low density polyethylene is mixed with the medium density polyethylene, which can improve the puncture resistance of the outer layer, and the outer layer has good fluidity, easy casting and film forming, good temperature resistance and high mechanical strength by matching with the polybutylene terephthalate, and mixed with PA66 polyamide resin, the strength and rigidity of the outer layer can be effectively improved, meanwhile, the strength and rigidity of the outer layer can be further improved by increasing the unsaturated polyester resin, and the second ethylene-vinyl acetate copolymer is matched, the second ethylene-vinyl acetate copolymer has certain elasticity, so that the outer layer has good toughness and impact resistance, and the hydrophobic three-layer co-extruded composite film is not easily scratched even under the action of external force;
meanwhile, the second metallocene linear low-density polyethylene has certain strength, so that the strength of the middle layer is improved, the second high-density polyethylene is matched to further enhance the strength of the middle layer, in addition, the polypropylene is mixed with the second metallocene linear low-density polyethylene to convert the structure of the middle layer into PE, so that the toughness of the middle layer is improved, the hydrophobic three-layer co-extrusion composite film is not easy to damage by matching with the inner layer and the outer layer, meanwhile, the connection strength between the middle layer and the inner layer and the outer layer can be improved by adding the third metallocene linear low-density polyethylene, and the connection strength between the middle layer and the inner layer and the outer layer can be further enhanced by matching with the first adhesive and the second adhesive, even after the hydrophobic three-layer co-extrusion composite film is used for too long time, the hydrophobic three-layer co-extrusion composite film is not easy to be damaged due to the fact that the structure between two adjacent layers is not easy to separate.
S200: weighing a first metallocene linear low-density polyethylene, an ethylene-octene block copolymer, a first high-density polyethylene, a first low-density polyethylene, a first ethylene-vinyl acetate copolymer and a polypropylene toughening agent according to a formula ratio, and then placing the materials into a first stirrer for mixing; metering a second metallocene linear low-density polyethylene, a second high-density polyethylene and polypropylene according to a formula ratio, and mixing in a second stirrer; metering medium-density polyethylene, second low-density polyethylene and polybutylene terephthalate according to a formula proportion, and mixing in a third stirrer;
wherein the rotation speed of the first stirrer is 350r/min, the temperature is 95 ℃, and the mixing time is 9 min; the rotation speed of the second stirrer is 400r/min, the temperature is 90 ℃, and the mixing time is 8 min; the rotating speed of the third stirrer is 300r/min, the temperature is 105 ℃, the mixing time is 10min, the positions of the first stirrer, the second stirrer and the third stirrer are different, and the first stirrer is used for fully mixing the raw materials for preparing the inner layer according to the formula proportion and uniformly stirring; the second stirrer is used for fully mixing the raw materials for preparing the middle layer according to the formula proportion and stirring uniformly; the third stirrer is used for fully mixing the raw materials for preparing the outer layer according to the formula proportion and stirring uniformly; and further the performance of the manufactured hydrophobic three-layer co-extrusion composite film is more excellent.
S300: the materials mixed in the first stirrer, the second stirrer and the third stirrer are sequentially placed in hoppers of three corresponding three-layer co-extrusion blow molding machine sets respectively, are conveyed to a die head through a screen changing mechanism and a material pipe, and are extruded through the die head and then are stretched to form the inner layer, the middle layer and the outer layer respectively;
wherein the first mixer will stir and mix the completion the raw materials of inlayer transmit to the hopper of the three-layer co-extrusion blow molding unit that corresponds with it in, and the hopper temperature of the three-layer co-extrusion blow molding unit that corresponds with first mixer: the first zone is 145 ℃, the second zone is 160 ℃, the third zone is 165 ℃, the fourth zone is 150 ℃ and the fifth zone is 155 ℃; the second mixer is used for mixing the raw materials in the middle layer, and the raw materials are conveyed to the hopper of the three-layer co-extrusion blow molding machine set corresponding to the second mixer, and the hopper temperature of the three-layer co-extrusion blow molding machine set corresponding to the second mixer is as follows: 140 ℃ in the first area, 155 ℃ in the second area, 160 ℃ in the third area, 155 ℃ in the fourth area and 160 ℃ in the fifth area; the third mixer will stir and mix the completion during outer raw materials transmission to the hopper of the three-layer co-extrusion blow molding unit that corresponds with it, and the hopper temperature of the three-layer co-extrusion blow molding unit that corresponds with the third mixer: the first zone was 135 deg.C, the second zone 155 deg.C, the third zone 155 deg.C, the fourth zone 150 deg.C and the fifth zone 155 deg.C. The raw material mixture in the hopper of each three-layer co-extrusion blow molding machine set is fully mixed, then is sent to a die head through a corresponding screen changing mechanism and a material pipe, and is extruded by the die head and then is stretched to form the inner layer, the middle layer and the outer layer, wherein the temperature of the die head is 235 ℃, and the die head temperature is set so that the prepared outer layer, the middle layer and the inner layer have better performances in various aspects such as strength and toughness.
S400: blowing cooling air by a fan to blow and expand the film tube into film bubbles, cooling the film bubbles by a cooling air ring and a film bubble internal cooling system, treating the film bubbles by a drafting device and a corona processor, and then feeding the film bubbles into a winding device;
and cooling air is blown into the film tube by the electrified fan, the film tube is blown into a film bubble, the blowing-up ratio is 3, and the film bubble enters a winding device after being cooled by an external cooling air ring and a film bubble internal cooling system and treated by a drafting device and a corona processor.
S500: and the rolling device rolls the cooled film bubble to obtain the hydrophobic three-layer co-extrusion composite film.
And rolling the cooled film bubble by using a rolling device to obtain the hydrophobic three-layer co-extrusion composite film with the inner layer, the middle layer and the outer layer.
Example 3
As shown in fig. 1, table 7, table 8, table 9 and table 10:
TABLE 7 quality of composition, melt flow rate and density of example 3
Figure BDA0002137519420000141
TABLE 8 rotational speeds, temperatures, and mixing times for the first, second, and third mixers of example 3
Rotational speed r/min Temperature of Mixing time min
First mixer 400 100 10
Second mixer 450 100 10
Third mixer 400 115 12
TABLE 9 hopper temperature of the unit corresponding to the first, second and third mixers of example 3
Figure BDA0002137519420000151
S100: and (2) metering the materials of the inner layer, the middle layer and the outer layer according to the formula proportion:
the inner layer comprises 40 parts of a first metallocene linear low density polyethylene, has a melt flow rate of 3.0g/10min, and a density of 0.962 g/cc; 20 parts of an ethylene-octene block copolymer, having a melt flow rate of 4.8g/10min and a density of 0.900 g/cc; 30 parts of first high-density polyethylene, the melt flow rate is 2.0g/10min, and the density is 0.962 g/cc; 30 parts of first low-density polyethylene, wherein the melt flow rate is 6.0g/10min, and the density is 0.96 g/cc; 20 parts of a first ethylene-vinyl acetate copolymer, 15 parts of a polypropylene toughening agent and 15 parts of a first adhesive;
the middle layer comprises 60 parts of a second metallocene linear low density polyethylene, and has a melt flow rate of 3.0g/10min and a density of 0.962 g/cc; 40 parts of second high-density polyethylene, the melt flow rate of the second high-density polyethylene is 2.0g/10min, and the density of the second high-density polyethylene is 0.962 g/cc; 20 parts of polypropylene and 20 parts of third metallocene linear low-density polyethylene;
the outer layer comprises 40 parts of medium density polyethylene, the melt flow rate is 3.0g/10min, the density is 0.95g/cc, 40 parts of second low density polyethylene, the melt flow rates are all 6.0g/10min, and the density is 0.96 g/cc; 30 parts of polybutylene terephthalate, 20 parts of PA66 polyamide resin, 15 parts of unsaturated polyester resin, 20 parts of second ethylene-vinyl acetate copolymer and 15 parts of second adhesive.
Wherein the inner layer takes the first metallocene linear low density polyethylene as a main body, the first metallocene linear low density polyethylene has certain strength per se, so that the strength of the inner layer is improved, and the flexibility and the right-angle tear strength of the inner layer can be obviously improved by matching with the ethylene-octene block copolymer, and meanwhile, the oxygen transmission amount of the inner layer is less than 0.8cm3/m224 h.0.1 MP, water vapor transmission less than 0.6cm3/m224h, certain hydrophobicity, and the first high-density polyethylene can be matched to further enhance the strength of the inner layer, and the EVA ethylene-vinyl acetate copolymer can be blended with the first low-density polyethylene to improve the puncture resistance of the inner layerThe EVA ethylene-vinyl acetate copolymer can improve the wear resistance and toughness of the inner layer, and the polypropylene toughening agent is matched to further improve the strength of the inner layer, so that the hydrophobic three-layer co-extruded composite film is not easy to damage when the inner layer of the hydrophobic three-layer co-extruded composite film is rubbed with an object under the action of external force by improving the wear resistance, toughness and strength of the inner layer;
meanwhile, the addition of the medium density polyethylene can improve the strength of the outer layer and adjust the processability of the outer layer to a certain degree, the second low density polyethylene is mixed with the medium density polyethylene, which can improve the puncture resistance of the outer layer, and the outer layer has good fluidity, easy casting and film forming, good temperature resistance and high mechanical strength by matching with the polybutylene terephthalate, and mixed with PA66 polyamide resin, the strength and rigidity of the outer layer can be effectively improved, meanwhile, the strength and rigidity of the outer layer can be further improved by increasing the unsaturated polyester resin, and the second ethylene-vinyl acetate copolymer is matched, the second ethylene-vinyl acetate copolymer has certain elasticity, so that the outer layer has good toughness and impact resistance, and the hydrophobic three-layer co-extruded composite film is not easily scratched even under the action of external force;
meanwhile, the second metallocene linear low-density polyethylene has certain strength, so that the strength of the middle layer is improved, the second high-density polyethylene is matched to further enhance the strength of the middle layer, in addition, the polypropylene is mixed with the second metallocene linear low-density polyethylene to convert the structure of the middle layer into PE, so that the toughness of the middle layer is improved, the hydrophobic three-layer co-extrusion composite film is not easy to damage by matching with the inner layer and the outer layer, meanwhile, the connection strength between the middle layer and the inner layer and the outer layer can be improved by adding the third metallocene linear low-density polyethylene, and the connection strength between the middle layer and the inner layer and the outer layer can be further enhanced by matching with the first adhesive and the second adhesive, even after the hydrophobic three-layer co-extrusion composite film is used for too long time, the hydrophobic three-layer co-extrusion composite film is not easy to be damaged due to the fact that the structure between two adjacent layers is not easy to separate.
S200: weighing a first metallocene linear low-density polyethylene, an ethylene-octene block copolymer, a first high-density polyethylene, a first low-density polyethylene, a first ethylene-vinyl acetate copolymer and a polypropylene toughening agent according to a formula ratio, and then placing the materials into a first stirrer for mixing; metering a second metallocene linear low-density polyethylene, a second high-density polyethylene and polypropylene according to a formula ratio, and mixing in a second stirrer; metering medium-density polyethylene, second low-density polyethylene and polybutylene terephthalate according to a formula proportion, and mixing in a third stirrer;
wherein the rotation speed of the first stirrer is 400r/min, the temperature is 100 ℃, and the mixing time is 10 min; the rotation speed of the second stirrer is 450r/min, the temperature is 100 ℃, and the mixing time is 10 min; the rotating speed of the third stirrer is 400r/min, the temperature is 115 ℃, the mixing time is 12min, the positions of the first stirrer, the second stirrer and the third stirrer are different, and the first stirrer is used for fully mixing the raw materials for preparing the inner layer according to the formula proportion and uniformly stirring; the second stirrer is used for fully mixing the raw materials for preparing the middle layer according to the formula proportion and stirring uniformly; the third stirrer is used for fully mixing the raw materials for preparing the outer layer according to the formula proportion and stirring uniformly; and further the performance of the manufactured hydrophobic three-layer co-extrusion composite film is more excellent.
S300: the materials mixed in the first stirrer, the second stirrer and the third stirrer are sequentially placed in hoppers of three corresponding three-layer co-extrusion blow molding machine sets respectively, are conveyed to a die head through a screen changing mechanism and a material pipe, and are extruded through the die head and then are stretched to form the inner layer, the middle layer and the outer layer respectively;
wherein the first mixer will stir and mix the completion the raw materials of inlayer transmit to the hopper of the three-layer co-extrusion blow molding unit that corresponds with it in, and the hopper temperature of the three-layer co-extrusion blow molding unit that corresponds with first mixer: the first zone is 150 ℃, the second zone is 165 ℃, the third zone is 170 ℃, the fourth zone is 160 ℃ and the fifth zone is 160 ℃; the second mixer is used for mixing the raw materials in the middle layer, and the raw materials are conveyed to the hopper of the three-layer co-extrusion blow molding machine set corresponding to the second mixer, and the hopper temperature of the three-layer co-extrusion blow molding machine set corresponding to the second mixer is as follows: the first zone is 150 ℃, the second zone is 165 ℃, the third zone is 170 ℃, the fourth zone is 160 ℃ and the fifth zone is 165 ℃; the third mixer will stir and mix the completion during outer raw materials transmission to the hopper of the three-layer co-extrusion blow molding unit that corresponds with it, and the hopper temperature of the three-layer co-extrusion blow molding unit that corresponds with the third mixer: the first zone is 140 ℃, the second zone is 160 ℃, the third zone is 160 ℃, the fourth zone is 160 ℃, and the fifth zone is 160 ℃. The raw material mixture in the hopper of each three-layer co-extrusion blow molding machine set is fully mixed, then is sent to a die head through a corresponding screen changing mechanism and a material pipe, and is extruded by the die head and then is stretched to form the inner layer, the middle layer and the outer layer, wherein the temperature of the die head is 240 ℃, and the die head is set to enable the prepared outer layer, the middle layer and the inner layer to have better performances in various aspects such as strength, toughness and the like.
S400: blowing cooling air by a fan to blow and expand the film tube into film bubbles, cooling the film bubbles by a cooling air ring and a film bubble internal cooling system, treating the film bubbles by a drafting device and a corona processor, and then feeding the film bubbles into a winding device;
and cooling air is blown into the film tube by the electrified fan, the film tube is blown into a film bubble, the blowing-up ratio is 3, and the film bubble enters a winding device after being cooled by an external cooling air ring and a film bubble internal cooling system and treated by a drafting device and a corona processor.
S500: and the rolling device rolls the cooled film bubble to obtain the hydrophobic three-layer co-extrusion composite film.
And rolling the cooled film bubble by using a rolling device to obtain the hydrophobic three-layer co-extrusion composite film with the inner layer, the middle layer and the outer layer.
TABLE 10 die temperatures for inventive examples 1, 2, 3
First embodiment Second embodiment Third embodiment
Die temperature C 230 235 240
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. The preparation method of the hydrophobic three-layer co-extrusion composite film is characterized by comprising the following raw materials in parts by mass: an inner layer, an intermediate layer and an outer layer;
the inner layer comprises 30-40 parts of first metallocene linear low-density polyethylene, 10-20 parts of ethylene-octene block copolymer, 10-30 parts of first high-density polyethylene, 10-30 parts of first low-density polyethylene, 10-20 parts of first ethylene-vinyl acetate copolymer and 5-15 parts of polypropylene toughening agent;
the middle layer comprises 40-60 parts of second metallocene linear low-density polyethylene, 20-30 parts of second high-density polyethylene and 10-20 parts of polypropylene;
the outer layer comprises 30-40 parts of medium density polyethylene, 20-40 parts of second low density polyethylene and 20-30 parts of polybutylene terephthalate;
weighing a first metallocene linear low-density polyethylene, an ethylene-octene block copolymer, a first high-density polyethylene, a first low-density polyethylene, a first ethylene-vinyl acetate copolymer and a polypropylene toughening agent according to a formula ratio, and then placing the materials into a first stirrer for mixing; metering a second metallocene linear low-density polyethylene, a second high-density polyethylene and polypropylene according to a formula ratio, and mixing in a second stirrer; metering medium-density polyethylene, second low-density polyethylene and polybutylene terephthalate according to a formula proportion, and mixing in a third stirrer;
the materials mixed in the first stirrer, the second stirrer and the third stirrer are sequentially placed in hoppers of three corresponding three-layer co-extrusion blow molding machine sets respectively, are conveyed to a die head through a screen changing mechanism and a material pipe, and are extruded through the die head and then are stretched to form the inner layer, the middle layer and the outer layer respectively;
blowing cooling air by a fan to blow and expand the film tube into film bubbles, cooling the film bubbles by a cooling air ring and a film bubble internal cooling system, treating the film bubbles by a drafting device and a corona processor, and then feeding the film bubbles into a winding device;
and the rolling device rolls the cooled film bubble to obtain the hydrophobic three-layer co-extrusion composite film.
2. The method of claim 1, wherein the hydrophobic three-layer coextruded composite film,
the inner layer further comprises a first adhesive, the mass part of the first adhesive is 5-15 parts, and the first adhesive is an ethylene acrylic acid copolymer.
3. The method of claim 1, wherein the hydrophobic three-layer coextruded composite film,
the middle layer further comprises a third metallocene linear low-density polyethylene, and the mass part of the third metallocene linear low-density polyethylene is 10-20 parts.
4. The method of claim 1, wherein the hydrophobic three-layer coextruded composite film,
the outer layer further comprises PA66 polyamide resin, and the mass part of the PA66 polyamide resin is 10-20 parts.
5. The method of claim 4, wherein the hydrophobic three-layer coextruded composite film,
the outer layer further comprises unsaturated polyester resin, and the mass portion of the unsaturated polyester resin is 5-15.
6. The method of claim 5, wherein the hydrophobic three-layer coextruded composite film,
the outer layer further comprises a second ethylene-vinyl acetate copolymer, and the mass part of the second ethylene-vinyl acetate copolymer is 10-20 parts.
7. The method of claim 6, wherein the hydrophobic three-layer coextruded composite film,
the outer layer further comprises a second adhesive, the mass part of the second adhesive is 5-15 parts, and the second adhesive is ethylene-methyl acrylate-glycidyl methacrylate.
8. The method of claim 1, wherein the hydrophobic three-layer coextruded composite film,
the rotating speed of the first stirrer is 300-400 r/min, the temperature is 90-100 ℃, and the mixing time is 8-10 min;
the rotating speed of the second stirrer is 350-450 r/min, the temperature is 80-100 ℃, and the mixing time is 6-10 min;
the rotating speed of the third stirrer is 200-400 r/min, the temperature is 95-115 ℃, and the mixing time is 8-12 min.
9. The method of claim 1, wherein the hydrophobic three-layer coextruded composite film,
the hopper temperature of the three-layer co-extrusion blow molding unit corresponding to the first stirrer is as follows: the temperature of the first zone is 140-150 ℃, the temperature of the second zone is 155-165 ℃, the temperature of the third zone is 160-170 ℃, the temperature of the fourth zone is 140-160 ℃, and the temperature of the fifth zone is 150-160 ℃;
and the hopper temperature of the three-layer co-extrusion blow molding unit corresponding to the second stirrer is as follows: the temperature of the first zone is 130-150 ℃, the temperature of the second zone is 145-165 ℃, the temperature of the third zone is 150-170 ℃, the temperature of the fourth zone is 150-160 ℃, and the temperature of the fifth zone is 155-165 ℃;
and the temperature of a hopper of the three-layer co-extrusion blow molding unit corresponding to the third stirrer is as follows: the temperature of the first zone is 130-140 ℃, the temperature of the second zone is 150-160 ℃, the temperature of the third zone is 150-160 ℃, the temperature of the fourth zone is 140-160 ℃, and the temperature of the fifth zone is 150-160 ℃.
10. The method of claim 1, wherein the hydrophobic three-layer coextruded composite film,
the temperature of the die head is 230-240 ℃.
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