CN111016371A - High-strength polyethylene composite film and preparation method thereof - Google Patents
High-strength polyethylene composite film and preparation method thereof Download PDFInfo
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- CN111016371A CN111016371A CN201911408180.6A CN201911408180A CN111016371A CN 111016371 A CN111016371 A CN 111016371A CN 201911408180 A CN201911408180 A CN 201911408180A CN 111016371 A CN111016371 A CN 111016371A
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/002—Methods
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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
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/24—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of indefinite length
- B29C41/32—Making multilayered or multicoloured articles
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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
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/10—Surface shaping of articles, e.g. embossing; Apparatus therefor by electric discharge treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
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- 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
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- 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
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
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- 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
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
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- 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
- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
- B32B2250/242—All polymers belonging to those covered by group B32B27/32
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- 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
- B32B2255/00—Coating on the layer surface
- B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
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- 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
- B32B2255/00—Coating on the layer surface
- B32B2255/26—Polymeric coating
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- 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
- B32B2307/54—Yield strength; Tensile strength
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- 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
- B32B2307/724—Permeability to gases, adsorption
- B32B2307/7242—Non-permeable
Abstract
The invention discloses a high-strength polyethylene composite film and a preparation method thereof, the high-strength polyethylene composite film comprises a coating and a polyethylene film, the polyethylene film comprises an outer layer, a middle layer and an inner layer, and the outer layer of the polyethylene film comprises the following raw materials: low density polyethylene, linear low density polyethylene, erucamide; the inner layer is composed of the following raw materials: low density polyethylene, a die opener; the middle layer is composed of the following raw materials: linear low density polyethylene, high density polyethylene, nanometer calcium sulfate whisker. According to the high-strength polyethylene composite film, the polyethylene film is prepared by three-layer co-extrusion compounding, materials of different layers can be compounded to realize performance superposition, and then the surface of the polyethylene film is coated with the coating, so that the tensile strength and the gas barrier property of the polyethylene film are further enhanced, and the application field is expanded.
Description
Technical Field
The invention relates to the technical field of polyethylene composite films, in particular to a high-strength polyethylene composite film and a preparation method thereof.
Background
With the gradual rise of the fast-moving product industry, the demand of packaging materials is increasing, and the requirements of more and more consumers on the functional packaging of fast-moving consumer products are also higher and higher. The traditional packaging materials of paper and aluminum foil can not meet the requirements and are gradually replaced by film packaging materials, and the film packaging materials have the characteristics of high tensile strength, light weight, no toxicity, no odor, product leakage or damage prevention and the like.
The low-density polyethylene film is semitransparent, glossy and soft, has excellent chemical stability, heat sealability, water resistance and moisture resistance, has wide application prospects in industrial and agricultural production and daily life, and is easy to generate melt fracture, poor in barrier property and film strength and high in production cost after long-term application.
Chinese patent CN102218875B discloses an anti-adhesion medical composite film, which comprises a first surface layer, a second surface layer and an inner layer, wherein the inner layer is adhered on the first surface layer, and the second surface layer is adhered on the inner layer; the first surface layer and the second surface layer have the same composition and respectively comprise the following components in parts by weight: 49-61 parts of low-density polyethylene, 38-51 parts of linear low-density polyethylene, 0.5-0.7 part of silicon dioxide and 0.04-0.06 part of slipping agent; the inner layer comprises the following components in parts by weight: 20-70 parts of low-density polyethylene and 30-80 parts of medium-high density polyethylene. The anti-adhesion medical composite film has stable friction coefficient and good anti-adhesion property, medical products produced by using the film do not have adhesion phenomenon when being unfolded after being folded and treated by ethylene oxide and other disinfection modes, and the medical products have good transparency and good overall appearance effect after being unfolded.
Chinese patent CN104960297B discloses a polyethylene composite film prepared by a casting method and a preparation method thereof, belonging to the technical field of plastic films, wherein the polyethylene composite film is formed by compounding an inner layer, a middle layer and an outer layer, and the inner layer is prepared by 30% of low-density polyethylene, metallocene polyethylene and linear polyethylene by mass ratio: 50%: 20 percent, the middle layer is composed of linear polyethylene, and the outer layer is composed of high-pressure polyethylene and linear polyethylene according to the mass ratio of 30 percent: 70 percent of the components. The advantage lies in that three materials are compounded into a three-layer film by three extruders of a three-layer coextrusion casting film machine set, and the finished film has the required excellent characteristics because the materials with different properties are compounded together in the extrusion process and are superposed in the characteristics. The thickness consistency of the obtained polyethylene composite film is good, the problems of low film blowing capacity, large thickness error, large haze and low capacity are solved, and the mold of the three-layer coextrusion casting film machine set adopts a T-shaped machine head, so that the automatic production is realized.
Therefore, in order to solve the problems, the invention provides a high-strength polyethylene composite film which has high tensile strength, good gas barrier property and processability and low production cost.
Disclosure of Invention
The invention aims at the problems and provides a high-strength polyethylene composite film and a preparation method thereof.
The technical scheme adopted by the invention for solving the problems is as follows: a high-strength polyethylene composite film comprises a coating and a polyethylene film, wherein the polyethylene film comprises an outer layer, a middle layer and an inner layer, and the outer layer of the polyethylene film comprises the following raw materials in parts by weight: 15 to 30 portions of low-density polyethylene, 10 to 20 portions of linear low-density polyethylene and 1.2 to 2.5 portions of erucamide; the inner layer is composed of the following raw materials in parts by weight: 22 to 36 portions of low-density polyethylene and 0.8 to 1.8 portions of opening agent; the middle layer is composed of the following raw materials in parts by weight: 30 to 45 parts of linear low density polyethylene, 10 to 22 parts of high density polyethylene and 1.2 to 3.2 parts of nano calcium sulfate whisker.
According to the high-strength polyethylene composite film, the erucamide is added into the outer layer of the polyethylene film, so that the friction coefficient of the outer layer of the film is reduced, the anti-blocking performance of the outer layer is improved, and the high-strength polyethylene composite film has a certain antistatic performance; the inner layer is added with high-density polyethylene and nano calcium sulfate whiskers, so that the compatibility of the linear low-density polyethylene and the high-density polyethylene is enhanced, the crystallization speed of polyethylene molecules is slowed down, the melt strength and the gas barrier property of the linear low-density polyethylene are improved, and the tensile strength of the polyethylene film is further improved.
Further, the outer layer of the polyethylene film is composed of the following raw materials in parts by weight: 18 to 26 parts of low-density polyethylene, 12 to 18 parts of linear low-density polyethylene and 1.7 to 2.0 parts of erucamide; the inner layer is composed of the following raw materials in parts by weight: 26 to 32 portions of low-density polyethylene and 1.0 to 1.5 portions of opening agent; the middle layer is composed of the following raw materials in parts by weight: 35 to 40 parts of linear low density polyethylene, 12 to 28 parts of high density polyethylene and 1.7 to 2.7 parts of nano calcium sulfate crystal whisker.
Furthermore, the coating is prepared from a mixture of graphene oxide, polyvinyl alcohol and nano silicon dioxide.
Further, the mass ratio of graphene oxide, polyvinyl alcohol and nano silicon dioxide in the raw materials for preparing the coating is 1-2: 5: 0.8.
further, the mass ratio of the coating to the polyethylene film is 0.08-0.12: 2.
another object of the present invention is to provide a method for preparing a high-strength polyethylene composite film, comprising the steps of:
step one, weighing the raw materials of the outer layer, the middle layer and the inner layer of the polyethylene film according to the weight parts, drying the raw materials of the outer layer, the middle layer and the inner layer at the temperature of 100-120 ℃ for 60-90 minutes, and uniformly mixing to obtain the materials of the outer layer, the middle layer and the inner layer for later use;
adding graphene oxide into the aqueous solution according to the mass ratio, adding polyvinyl alcohol after carrying out ultrasonic stirring for 15-20 minutes for the first time, adding nano silicon dioxide after carrying out ultrasonic stirring for 10-15 minutes for the second time, and carrying out ultrasonic stirring for 10-20 minutes for the third time to obtain a mixed solution for later use;
respectively loading the outer layer material, the middle layer material and the inner layer material obtained in the step one into A, B, C hoppers, heating and melting by using an extruder, converging the materials into an upper die head, a middle die head and a lower die head of a casting die head for compounding, casting, cooling and shaping, carrying out corona treatment, reeling and slitting to obtain a polyethylene film;
coating the surface of the polyethylene film obtained in the step three with the mixed solution obtained in the step two, and drying the polyethylene film at the temperature of 55-85 ℃ to constant weight to obtain the high-strength polyethylene composite film with the thickness of 0.085-0.130 mm.
Further, in the second step, the ratio of the graphene oxide to the aqueous solution is 1 mg: 15mL to 20 mL.
Further, in the second step, the aqueous solution contains 3.5-6.5% by mass of isopropanol.
Further, in the third step, the heating and melting temperature of the extruder is 195-225 ℃.
The invention has the advantages that:
(1) according to the high-strength polyethylene composite film obtained by the invention, the polyethylene film is prepared by three-layer co-extrusion compounding, materials of different layers with different properties can be compounded to realize property superposition, and then the surface of the polyethylene film is coated with the coating, so that the tensile strength and the gas barrier property of the polyethylene film are further enhanced, and the application field of the polyethylene film is expanded;
(2) according to the high-strength polyethylene composite film obtained by the invention, the coating raw materials are graphene oxide, polyvinyl alcohol and nano silicon dioxide, and the high-strength polyethylene composite film has high bonding strength with the polyethylene film, so that the gas barrier property and the mechanical strength of the polyethylene composite film can be obviously enhanced, and the service life is prolonged;
(3) the high-strength polyethylene composite film disclosed by the invention is simple in preparation process, high in controllability, low in cost and capable of saving energy consumption and being widely popularized.
Detailed Description
The following detailed description of embodiments of the invention, but the invention can be practiced in many different ways, as defined and covered by the claims.
Example 1
High-strength polyethylene composite film
The polyethylene film comprises a coating and a polyethylene film, wherein the polyethylene film comprises an outer layer, a middle layer and an inner layer, and the outer layer of the polyethylene film comprises the following raw materials in parts by weight: 15kg of low-density polyethylene, 10kg of linear low-density polyethylene and 1.2kg of erucamide; the inner layer is composed of the following raw materials in parts by weight: 22kg of low-density polyethylene and 0.8kg of opening agent; the middle layer is composed of the following raw materials in parts by weight: 30kg of linear low-density polyethylene, 10kg of high-density polyethylene and 1.2kg of nano calcium sulfate whisker; the coating is prepared from the following raw materials in a mass ratio of 1: 5: 0.8 of a mixture consisting of graphene oxide, polyvinyl alcohol and nano silicon dioxide; the mass ratio of the coating to the polyethylene film is 0.08: 2.
the preparation method comprises the following steps:
step one, weighing the raw materials of the outer layer, the middle layer and the inner layer of the polyethylene film according to the weight parts, drying the raw materials of the outer layer, the middle layer and the inner layer at the temperature of 100 ℃ for 60 minutes, and uniformly mixing to obtain the materials of the outer layer, the middle layer and the inner layer for later use;
adding graphene oxide into an aqueous solution according to a mass ratio, adding polyvinyl alcohol after carrying out ultrasonic stirring for 15 minutes for the first time, adding nano silicon dioxide after carrying out ultrasonic stirring for 10 minutes for the second time, and carrying out ultrasonic stirring for 10 minutes for the third time to obtain a mixed solution for later use; wherein the ratio of graphene oxide to aqueous solution is 1 mg: 15 mL; the water solution contains 3.5 percent of isopropanol by mass fraction;
respectively loading the outer layer material, the middle layer material and the inner layer material obtained in the step one into A, B, C hoppers, heating and melting by using an extruder, converging the materials into an upper die head, a middle die head and a lower die head of a casting die head for compounding, casting, cooling and shaping, carrying out corona treatment, reeling and slitting to obtain a polyethylene film; wherein the heating and melting temperature of the extruder is 195 ℃;
and step four, coating the mixed solution obtained in the step two on the surface of the polyethylene film obtained in the step three, and drying the polyethylene film at the temperature of 55 ℃ to constant weight to obtain the high-strength polyethylene composite film with the thickness of 0.085 mm.
Example 2
High-strength polyethylene composite film
The polyethylene film comprises a coating and a polyethylene film, wherein the polyethylene film comprises an outer layer, a middle layer and an inner layer, and the outer layer of the polyethylene film comprises the following raw materials in parts by weight: 30kg of low-density polyethylene, 20kg of linear low-density polyethylene and 2.5kg of erucamide; the inner layer is composed of the following raw materials in parts by weight: 36kg of low-density polyethylene and 1.8kg of an opening agent; the middle layer is composed of the following raw materials in parts by weight: 45kg of linear low-density polyethylene, 22kg of high-density polyethylene and 3.2kg of nano calcium sulfate whisker; the coating is prepared from the following raw materials in a mass ratio of 2: 5: 0.8 of a mixture consisting of graphene oxide, polyvinyl alcohol and nano silicon dioxide; the mass ratio of the coating to the polyethylene film is 0.12: 2.
the preparation method comprises the following steps:
step one, weighing the raw materials of the outer layer, the middle layer and the inner layer of the polyethylene film according to the weight parts, drying the raw materials of the outer layer, the middle layer and the inner layer at the temperature of 120 ℃ for 90 minutes respectively, and then uniformly mixing to obtain the materials of the outer layer, the middle layer and the inner layer for later use;
adding graphene oxide into the aqueous solution according to the mass ratio, adding polyvinyl alcohol after carrying out ultrasonic stirring for 20 minutes for the first time, adding nano silicon dioxide after carrying out ultrasonic stirring for 15 minutes for the second time, and carrying out ultrasonic stirring for 20 minutes for the third time to obtain a mixed solution for later use; wherein the ratio of graphene oxide to aqueous solution is 1 mg: 20 mL; the water solution contains isopropanol with the mass fraction of 6.5 percent;
respectively loading the outer layer material, the middle layer material and the inner layer material obtained in the step one into A, B, C hoppers, heating and melting by using an extruder, converging the materials into an upper die head, a middle die head and a lower die head of a casting die head for compounding, casting, cooling and shaping, carrying out corona treatment, reeling and slitting to obtain a polyethylene film; wherein the heating and melting temperature of the extruder is 225 ℃;
and step four, coating the mixed solution obtained in the step two on the surface of the polyethylene film obtained in the step three, and drying the polyethylene film at the temperature of 85 ℃ to constant weight to obtain the high-strength polyethylene composite film with the thickness of 0.130 mm.
Example 3
High-strength polyethylene composite film
The polyethylene film comprises a coating and a polyethylene film, wherein the polyethylene film comprises an outer layer, a middle layer and an inner layer, and the outer layer of the polyethylene film comprises the following raw materials in parts by weight: 18kg of low-density polyethylene, 12kg of linear low-density polyethylene and 1.7kg of erucamide; the inner layer is composed of the following raw materials in parts by weight: 26kg of low-density polyethylene and 1.0kg of an opening agent; the middle layer is composed of the following raw materials in parts by weight: 35kg of linear low-density polyethylene, 12kg of high-density polyethylene and 1.7kg of nano calcium sulfate whisker; the coating is prepared from the following raw materials in a mass ratio of 1.2: 5: 0.8 of a mixture consisting of graphene oxide, polyvinyl alcohol and nano silicon dioxide; the mass ratio of the coating to the polyethylene film is 0.09: 2.
the preparation method comprises the following steps:
step one, weighing the raw materials of the outer layer, the middle layer and the inner layer of the polyethylene film according to the weight parts, drying the raw materials of the outer layer, the middle layer and the inner layer at 105 ℃ for 70 minutes respectively, and then uniformly mixing to obtain the materials of the outer layer, the middle layer and the inner layer for later use;
adding graphene oxide into an aqueous solution according to a mass ratio, adding polyvinyl alcohol after carrying out ultrasonic stirring for 17 minutes for the first time, adding nano silicon dioxide after carrying out ultrasonic stirring for 11 minutes for the second time, and carrying out ultrasonic stirring for 12 minutes for the third time to obtain a mixed solution for later use; wherein the ratio of graphene oxide to aqueous solution is 1 mg: 16 mL; the water solution contains 4.5 percent of isopropanol by mass fraction;
respectively loading the outer layer material, the middle layer material and the inner layer material obtained in the step one into A, B, C hoppers, heating and melting by using an extruder, converging the materials into an upper die head, a middle die head and a lower die head of a casting die head for compounding, casting, cooling and shaping, carrying out corona treatment, reeling and slitting to obtain a polyethylene film; wherein the heating and melting temperature of the extruder is 205 ℃;
and step four, coating the mixed solution obtained in the step two on the surface of the polyethylene film obtained in the step three, and drying the polyethylene film at the temperature of 65 ℃ to constant weight to obtain the high-strength polyethylene composite film with the thickness of 0.105 mm.
Example 4
High-strength polyethylene composite film
The polyethylene film comprises a coating and a polyethylene film, wherein the polyethylene film comprises an outer layer, a middle layer and an inner layer, and the outer layer of the polyethylene film comprises the following raw materials in parts by weight: 26kg of low-density polyethylene, 18kg of linear low-density polyethylene and 2.0kg of erucamide; the inner layer is composed of the following raw materials in parts by weight: 32kg of low-density polyethylene and 1.5kg of an opening agent; the middle layer is composed of the following raw materials in parts by weight: 40kg of linear low-density polyethylene, 28kg of high-density polyethylene and 2.7kg of nano calcium sulfate whisker; the coating is prepared from the following raw materials in a mass ratio of 1.8: 5: 0.8 of a mixture consisting of graphene oxide, polyvinyl alcohol and nano silicon dioxide; the mass ratio of the coating to the polyethylene film is 0.11: 2.
the preparation method comprises the following steps:
step one, weighing the raw materials of the outer layer, the middle layer and the inner layer of the polyethylene film according to the weight parts, drying the raw materials of the outer layer, the middle layer and the inner layer at the temperature of 115 ℃ for 80 minutes, and uniformly mixing to obtain the materials of the outer layer, the middle layer and the inner layer for later use;
adding graphene oxide into an aqueous solution according to a mass ratio, adding polyvinyl alcohol after carrying out ultrasonic stirring for 19 minutes for the first time, adding nano silicon dioxide after carrying out ultrasonic stirring for 14 minutes for the second time, and carrying out ultrasonic stirring for 18 minutes for the third time to obtain a mixed solution for later use; wherein the ratio of graphene oxide to aqueous solution is 1 mg: 19 mL; the water solution contains 5.5 percent of isopropanol by mass fraction;
respectively loading the outer layer material, the middle layer material and the inner layer material obtained in the step one into A, B, C hoppers, heating and melting by using an extruder, converging the materials into an upper die head, a middle die head and a lower die head of a casting die head for compounding, casting, cooling and shaping, carrying out corona treatment, reeling and slitting to obtain a polyethylene film; wherein the heating and melting temperature of the extruder is 215 ℃;
and step four, coating the mixed solution obtained in the step two on the surface of the polyethylene film obtained in the step three, and drying the polyethylene film at the temperature of 75 ℃ to constant weight to obtain the high-strength polyethylene composite film with the thickness of 0.125 mm.
Example 5
High-strength polyethylene composite film
The polyethylene film comprises a coating and a polyethylene film, wherein the polyethylene film comprises an outer layer, a middle layer and an inner layer, and the outer layer of the polyethylene film comprises the following raw materials in parts by weight: 23kg of low-density polyethylene, 15kg of linear low-density polyethylene and 1.9kg of erucamide; the inner layer is composed of the following raw materials in parts by weight: 29kg of low-density polyethylene and 1.3kg of an opening agent; the middle layer is composed of the following raw materials in parts by weight: 38kg of linear low-density polyethylene, 22kg of high-density polyethylene and 3.2kg of nano calcium sulfate whisker; the coating is prepared from the following raw materials in a mass ratio of 1.5: 5: 0.8 of a mixture consisting of graphene oxide, polyvinyl alcohol and nano silicon dioxide; the mass ratio of the coating to the polyethylene film is 0.10: 2.
the preparation method comprises the following steps:
step one, weighing the raw materials of the outer layer, the middle layer and the inner layer of the polyethylene film according to the weight parts, drying the raw materials of the outer layer, the middle layer and the inner layer at the temperature of 110 ℃ for 75 minutes, and uniformly mixing to obtain the materials of the outer layer, the middle layer and the inner layer for later use;
adding graphene oxide into the aqueous solution according to the mass ratio, adding polyvinyl alcohol after carrying out ultrasonic stirring for 18 minutes for the first time, adding nano silicon dioxide after carrying out ultrasonic stirring for 13 minutes for the second time, and carrying out ultrasonic stirring for 15 minutes for the third time to obtain a mixed solution for later use; wherein the ratio of graphene oxide to aqueous solution is 1 mg: 18 mL; the water solution contains 5.0 percent of isopropanol by mass fraction;
respectively loading the outer layer material, the middle layer material and the inner layer material obtained in the step one into A, B, C hoppers, heating and melting by using an extruder, converging the materials into an upper die head, a middle die head and a lower die head of a casting die head for compounding, casting, cooling and shaping, carrying out corona treatment, reeling and slitting to obtain a polyethylene film; wherein the heating and melting temperature of the extruder is 210 ℃;
and step four, coating the mixed solution obtained in the step two on the surface of the polyethylene film obtained in the step three, and drying the polyethylene film at the temperature of 70 ℃ to constant weight to obtain the high-strength polyethylene composite film with the thickness of 0.110 mm.
Examples of the experiments
The tensile strength and heat-seal strength of the high-strength polyethylene composite films prepared in examples 1 to 5 were measured, respectively, and the oxygen permeability coefficient of the high-strength polyethylene composite films prepared in examples 1 to 5 was further measured. Further illustrating the advancement of the high strength polyethylene composite film of the present invention.
The statistics of the test results are shown in table 1:
table 1, Performance results of high strength polyethylene composite films prepared in inventive examples 1-5
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The high-strength polyethylene composite film comprises a coating and a polyethylene film, wherein the polyethylene film consists of an outer layer, a middle layer and an inner layer, and is characterized in that the outer layer of the polyethylene film consists of the following raw materials in parts by weight: 15 to 30 portions of low-density polyethylene, 10 to 20 portions of linear low-density polyethylene and 1.2 to 2.5 portions of erucamide; the inner layer is composed of the following raw materials in parts by weight: 22 to 36 portions of low-density polyethylene and 0.8 to 1.8 portions of opening agent; the middle layer is composed of the following raw materials in parts by weight: 30 to 45 parts of linear low density polyethylene, 10 to 22 parts of high density polyethylene and 1.2 to 3.2 parts of nano calcium sulfate whisker.
2. The high-strength polyethylene composite film according to claim 1, wherein the outer layer of the polyethylene film is composed of the following raw materials in parts by weight: 18 to 26 parts of low-density polyethylene, 12 to 18 parts of linear low-density polyethylene and 1.7 to 2.0 parts of erucamide; the inner layer is composed of the following raw materials in parts by weight: 26 to 32 portions of low-density polyethylene and 1.0 to 1.5 portions of opening agent; the middle layer is composed of the following raw materials in parts by weight: 35 to 40 parts of linear low density polyethylene, 12 to 28 parts of high density polyethylene and 1.7 to 2.7 parts of nano calcium sulfate crystal whisker.
3. The high-strength polyethylene composite film according to claim 1, wherein the coating is prepared from a mixture of graphene oxide, polyvinyl alcohol and nano-silica.
4. The high-strength polyethylene composite film according to claim 3, wherein the mass ratio of graphene oxide, polyvinyl alcohol and nano silicon dioxide in the raw materials for preparing the coating is 1-2: 5: 0.8.
5. the high-strength polyethylene composite film according to claim 1, wherein the mass ratio of the coating layer to the polyethylene film is 0.08-0.12: 2.
6. a preparation method of the high-strength polyethylene composite film according to any one of claims 1 to 5, characterized by comprising the following steps:
step one, weighing the raw materials of the outer layer, the middle layer and the inner layer of the polyethylene film according to the weight parts, drying the raw materials of the outer layer, the middle layer and the inner layer at the temperature of 100-120 ℃ for 60-90 minutes, and uniformly mixing to obtain the materials of the outer layer, the middle layer and the inner layer for later use;
adding graphene oxide into the aqueous solution according to the mass ratio, adding polyvinyl alcohol after carrying out ultrasonic stirring for 15-20 minutes for the first time, adding nano silicon dioxide after carrying out ultrasonic stirring for 10-15 minutes for the second time, and carrying out ultrasonic stirring for 10-20 minutes for the third time to obtain a mixed solution for later use;
respectively loading the outer layer material, the middle layer material and the inner layer material obtained in the step one into A, B, C hoppers, heating and melting by using an extruder, converging the materials into an upper die head, a middle die head and a lower die head of a casting die head for compounding, casting, cooling and shaping, carrying out corona treatment, reeling and slitting to obtain a polyethylene film;
coating the surface of the polyethylene film obtained in the step three with the mixed solution obtained in the step two, and drying the polyethylene film at the temperature of 55-85 ℃ to constant weight to obtain the high-strength polyethylene composite film with the thickness of 0.085-0.130 mm.
7. The preparation method according to claim 6, wherein in the second step, the ratio of the graphene oxide to the aqueous solution is 1 mg: 15mL to 20 mL.
8. The preparation method according to claim 6, wherein in the second step, the aqueous solution contains 3.5 to 6.5 mass percent of isopropanol.
9. The method according to claim 6, wherein the temperature of the extruder for heating and melting in the third step is 195 to 225 ℃.
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