CN112356543B - High-gloss high-transparency polyethylene casting film and preparation method thereof - Google Patents
High-gloss high-transparency polyethylene casting film and preparation method thereof Download PDFInfo
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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
- 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
- B32B27/18—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
- 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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- 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
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/406—Bright, glossy, shiny surface
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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
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/412—Transparent
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/08—Copolymers of ethene
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/20—Carboxylic acid amides
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Abstract
The invention relates to a polyethylene casting film and a preparation method thereof, in particular to a high-gloss high-transparency polyethylene casting film, belonging to the technical field of packaging materials. The invention provides a polyethylene casting film which comprises 25-30% of corona layer, 40-50% of middle layer and 20-30% of heat sealing layer by mass percent; the preparation raw materials of the corona layer and the intermediate layer are both linear low-density polyethylene resin a, and the preparation raw materials of the heat sealing layer are linear low-density polyethylene resin b with slipping agent and openness. Compared with the existing polyethylene casting film, the polyethylene casting film provided by the invention has the advantages of high glossiness, high transparency and high mechanical strength, meets the appearance requirements of polyethylene casting film packaging manufacturers, has low processing temperature, can save energy consumption and increases enterprise benefits.
Description
Technical Field
The invention relates to a polyethylene casting film and a preparation method thereof, in particular to a high-gloss high-transparency polyethylene casting film, belonging to the technical field of packaging materials.
Background
In recent years, with the development of the market, higher demands are being made on the quality of the film. The flatness and transparency of the film prepared by the film blowing method are difficult to meet the requirements; the film manufactured by adopting the coextrusion composite casting film equipment has excellent heat sealing performance, flatness, good transparency, high yield and low unit energy consumption, is one of main packaging composite base materials, and is increasingly popular with packaging printing production enterprises in China.
Cast films are a non-stretched, non-oriented cast film produced by melt casting and quenching. Including PE cast film (CPE), and is divided into LLDPE, LDPE, HDPE cast film, PET cast film, PVC cast film, PP cast film (CPP), EVA cast film, CPET cast film, PVB glass interlayer film, etc. Because the polyethylene cast film has better toughness, low temperature resistance, transparency, puncture resistance and good heat sealing performance, the polyethylene cast film is widely applied in the packaging industry. However, in the CPE packaging film, the requirements on the glossiness and transparency of the CPE film are high, and manufacturers producing CPE attach more and more importance to the appearance optical properties of the CPE film, so that it is necessary to produce a polyethylene casting film with high glossiness, high transparency and high stiffness.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a polyethylene casting film with better glossiness and higher transparency.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a polyethylene casting film, which is characterized by comprising 25-30% of a corona layer, 40-50% of an intermediate layer and 20-30% of a heat sealing layer in percentage by mass; the preparation raw materials of the corona layer and the intermediate layer comprise linear low-density polyethylene resin a, and the preparation raw materials of the heat sealing layer comprise linear low-density polyethylene resin b; the preparation raw materials of the linear low-density polyethylene resin b comprise polyethylene resin powder, a slipping agent and an opening agent.
The corona layer and the intermediate layer are prepared from the raw materials with moderate density, good melt fluidity, and the prepared film is flat, good in opening property and high in glossiness.
The preparation raw material of the heat sealing layer is linear low-density polyethylene resin b with smooth property and openness; the linear low-density polyethylene resin b is prepared from pure polyethylene resin powder, an auxiliary agent slipping agent and an opening agent in the production process through extrusion granulation. The preparation raw materials of the heat sealing layer have low melting point, and the prepared film has the characteristics of low heat sealing temperature, good opening property and good anti-blocking property.
As a preferable embodiment of the polyethylene casting film of the present invention, the mass ratio of the polyethylene resin powder, the slip agent, and the opening agent is: 0.982-0.998:0.0004-0.0008:0.0006-0.001.
As a preferable embodiment of the polyethylene casting film, the slipping agent is an amide compound, and the opening agent is nano silicon dioxide.
As a preferred embodiment of the polyethylene casting film according to the present invention, the linear low-density polyethylene resin a has a density of 0.923 to 0.930g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The melt flow rate of the linear low density polyethylene resin a is 3-4g/10min according to GB/T3682-2000 standard.
As a preferred embodiment of the polyethylene casting film according to the present invention, the linear low-density polyethylene resin b has a density of 0.918 to 0.925g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The melt flow rate of the linear low density polyethylene resin b is 3-4g/10min according to GB/T3682-2000 standard.
As a preferred embodiment of the polyethylene cast film of the present invention, the polyethylene cast film has a gloss of 94 or more according to ASTM D2457-2003.
As a preferable embodiment of the polyethylene casting film of the invention, the transparency of the polyethylene casting film is more than or equal to 97% according to GB/T2410-2008 standard.
As a preferable embodiment of the polyethylene casting film according to the present invention, the haze of the polyethylene casting film is 5% or less according to GB/T2410-2008.
As a preferable embodiment of the polyethylene casting film of the present invention, the longitudinal tensile strength of the polyethylene casting film is not less than 22MPa according to GB/T1040.3-2006 standard.
As a preferable embodiment of the polyethylene casting film of the present invention, the transverse tensile strength of the polyethylene casting film is not less than 21MPa according to GB/T1040.3-2006 standard.
In addition, another object of the present invention is to provide a method for preparing the polyethylene casting film, comprising the steps of: adding the preparation raw materials into an extruder, and extruding and casting to obtain the preparation method of the polyethylene casting film; the extrusion amount of the extruder was 300 kg/hr; the temperature of the first region to the fifth region of the processing temperature of the screw section of the extruder is 145 ℃, 185 ℃, 200 ℃ respectively; a melt pump of the extruder at 195 ℃; a dispenser of the extruder at 195 ℃; the die of the extruder was 190 ℃.
As a preferred embodiment of the preparation method of the present invention, the die temperature of the extruder is 190 ℃; the extrusion parameters of the extruder are as follows: the machine speed was 45HZ and the melt pump 65HZ.
As a preferred embodiment of the preparation method of the present invention, the winding parameters of the extruder: traction is carried out at 15HZ, and rolling is carried out at 48HZ.
As a preferred embodiment of the preparation method of the invention, the cooling roll surface temperature of the extruder is 25-28 ℃.
Compared with the prior art, the invention has the beneficial effects that:
(1) Compared with the existing polyethylene casting film, the polyethylene casting film provided by the invention has the advantages of high glossiness, high transparency and high mechanical strength, meets the appearance requirements of polyethylene casting film packaging manufacturers, has low processing temperature, can save energy consumption and increase enterprise benefits;
(2) The polyethylene casting film provided by the invention has moderate density and good melt fluidity, and the prepared film is flat, good in openness and high in glossiness; the preparation raw material of the heat sealing layer is linear low-density polyethylene resin b with smoothness and openness; the linear low-density polyethylene resin b is prepared from pure polyethylene resin powder, an auxiliary agent slipping agent and an opening agent in the production process by extrusion granulation; the preparation raw materials of the heat sealing layer have low melting point, and the prepared film has the characteristics of low heat sealing temperature, good opening property and good anti-blocking property;
(3) According to the polyethylene casting film provided by the invention, the glossiness of the polyethylene casting film is more than or equal to 94 according to the ASTM D2457-2003 standard; according to GB/T2410-2008 standard, the transparency of the polyethylene casting film is more than or equal to 97%; according to the GB/T2410-2008 standard, the haze of the polyethylene casting film is less than or equal to 5%; according to the GB/T1040.3-2006 standard, the longitudinal tensile strength of the polyethylene casting film is more than or equal to 22MPa; according to the GB/T1040.3-2006 standard, the transverse tensile strength of the polyethylene casting film is more than or equal to 21MPa.
Detailed Description
For a better description of the objects, technical solutions and advantages of the present invention, the present invention will be further described with reference to the following specific examples.
In the following examples, the slip agent is an amide compound, and the opening agent is nano silica.
Example 1
The embodiment is a polyethylene casting film provided by the invention, which comprises 25% of corona layer, 50% of middle layer and 25% of heat sealing layer in percentage by mass;
the corona layer and the intermediate layer were both made of a linear low density polyethylene resin a (density 0.928g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the According to GB/T3682-2000 standard, the melt index is 3.6g/10 min), and the raw material for preparing said heat-sealing layer includes linear low-density polyethylene resin b (density 0.923g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the According to GB/T3682-2000 standard, the melt index is 3.8g/10 min), and the preparation raw materials of the linear low-density polyethylene resin b comprise polyethylene resin powder, a slipping agent and an opening agent; the mass ratio of the polyethylene resin powder, the slipping agent and the opening agent is 0.982:0.0004:0.0006.
The preparation method of the polyethylene casting film comprises the following steps: adding the raw materials into an extruder according to the requirements for extrusion casting, wherein the extrusion amount of the extruder is 300 kg/h; extruder screw section processing temperature the temperatures in the first zone to the fifth zone are 145 ℃, 185 ℃, 200 ℃; a melt pump 195 ℃; the dispenser is 195 ℃; die 190 ℃. Extrusion parameters: a host rotation speed 45HZ melt pump 65HZ; winding parameters: traction is carried out at 15HZ, and rolling is carried out at 48HZ; and (3) cooling: the roll surface temperature was 25 ℃.
Example 2
The embodiment is a polyethylene casting film provided by the invention, which comprises 30% of corona layer, 50% of middle layer and 20% of heat sealing layer in percentage by mass;
the corona layer and the intermediate layer were both made of a linear low density polyethylene resin a (density 0.928g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the According to GB/T3682-2000 standard, the melt index is 3.6g/10 min), and the raw material for preparing said heat-sealing layer includes linear low-density polyethylene resin b (density 0.923g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the According toGB/T3682-2000 standard, melt index 3.8g/10 min); the preparation raw materials of the linear low-density polyethylene resin b comprise polyethylene resin powder, a slipping agent and an opening agent; the mass ratio of the polyethylene resin powder, the slipping agent and the opening agent is 0.998:0.0008:0.001.
The preparation method of the polyethylene casting film comprises the following steps: adding the raw materials into an extruder according to the requirements for extrusion casting, wherein the extrusion amount of the extruder is 300 kg/h; extruder screw section processing temperature the temperatures in the first zone to the fifth zone are 145 ℃, 185 ℃, 200 ℃; a melt pump 195 ℃; the dispenser is 195 ℃; die 190 ℃. Extrusion parameters: a host rotation speed 45HZ melt pump 65HZ; winding parameters: traction is carried out at 15HZ, and rolling is carried out at 48HZ; and (3) cooling: the roll surface temperature was 25 ℃.
Example 3
The embodiment is a polyethylene casting film provided by the invention, which comprises 30% of corona layer, 50% of middle layer and 20% of heat sealing layer in percentage by mass;
the corona layer and the intermediate layer were both made of a linear low density polyethylene resin a (density 0.928g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the According to GB/T3682-2000 standard, the melt index is 3.6g/10 min), and the raw material for preparing said heat-sealing layer includes linear low-density polyethylene resin b (density 0.923g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the According to GB/T3682-2000 standard, the melt index is 3.8g/10 min); the preparation raw materials of the linear low-density polyethylene resin b comprise polyethylene resin powder, a slipping agent and an opening agent; the mass ratio of the polyethylene resin powder to the slipping agent to the opening agent is 0.994:0.0010:0.0008.
The preparation method of the polyethylene casting film comprises the following steps: adding the raw materials into an extruder according to the requirements for extrusion casting, wherein the extrusion amount of the extruder is 300 kg/h; extruder screw section processing temperature the temperatures in the first zone to the fifth zone are 145 ℃, 185 ℃, 200 ℃; a melt pump 195 ℃; the dispenser is 195 ℃; die 190 ℃. Extrusion parameters: a host rotation speed 45HZ melt pump 65HZ; winding parameters: traction is carried out at 15HZ, and rolling is carried out at 48HZ; and (3) cooling: the roll surface temperature was 25 ℃.
Example 4
The embodiment is a polyethylene casting film provided by the invention, which comprises 30% of corona layer, 40% of middle layer and 30% of heat sealing layer in percentage by mass;
the corona layer and the intermediate layer were both made of a linear low density polyethylene resin a (density 0.928g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the According to GB/T3682-2000 standard, the melt index is 3.6g/10 min), and the raw material for preparing said heat-sealing layer includes linear low-density polyethylene resin b (density 0.923g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the According to GB/T3682-2000 standard, the melt index is 3.8g/10 min); the preparation raw materials of the linear low-density polyethylene resin b comprise polyethylene resin powder, a slipping agent and an opening agent; the mass ratio of the polyethylene resin powder to the slipping agent to the opening agent is 0.994:0.0010:0.0008.
The preparation method of the polyethylene casting film comprises the following steps: adding the raw materials into an extruder according to the requirements for extrusion casting, wherein the extrusion amount of the extruder is 300 kg/h; extruder screw section processing temperature the temperatures in the first zone to the fifth zone are 145 ℃, 185 ℃, 200 ℃; a melt pump 195 ℃; the dispenser is 195 ℃; die 190 ℃. Extrusion parameters: a host rotation speed 45HZ melt pump 65HZ; winding parameters: traction is carried out at 15HZ, and rolling is carried out at 48HZ; and (3) cooling: the roll surface temperature was 28 ℃.
Example 5
The embodiment is a polyethylene casting film provided by the invention, which comprises 28% of corona layer, 40% of middle layer and 22% of heat sealing layer in percentage by mass;
the preparation raw materials of the corona layer and the intermediate layer are both linear low density polyethylene resin a (density of 0.923g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the According to GB/T3682-2000 standard, the melt index is 3g/10 min), and the raw materials for preparing the heat-sealing layer comprise linear low-density polyethylene resin b (density 0.918g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the According to GB/T3682-2000 standard, the melt index is 3g/10 min); the preparation raw materials of the linear low-density polyethylene resin b comprise polyethylene resin powder, a slipping agent and an opening agent; the mass ratio of the polyethylene resin powder to the slipping agent to the opening agent is 0.994:0.0010:0.0008.
The preparation method of the polyethylene casting film comprises the following steps: adding the raw materials into an extruder according to the requirements for extrusion casting, wherein the extrusion amount of the extruder is 300 kg/h; extruder screw section processing temperature the temperatures in the first zone to the fifth zone are 145 ℃, 185 ℃, 200 ℃; a melt pump 195 ℃; the dispenser is 195 ℃; die 190 ℃. Extrusion parameters: a host rotation speed 45HZ melt pump 65HZ; winding parameters: traction is carried out at 15HZ, and rolling is carried out at 48HZ; and (3) cooling: the roll surface temperature was 26 ℃.
Example 6
The embodiment is a polyethylene casting film provided by the invention, which comprises 25% of corona layer, 50% of middle layer and 25% of heat sealing layer in percentage by mass;
the preparation raw materials of the corona layer and the intermediate layer are both linear low density polyethylene resin a (density of 0.925g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the According to GB/T3682-2000 standard, the melt index is 4g/10 min), and the raw materials for preparing the heat-sealing layer comprise linear low-density polyethylene resin b (density 0.923 g/cm) 3 The method comprises the steps of carrying out a first treatment on the surface of the According to GB/T3682-2000 standard, the melt index is 4g/10 min); the preparation raw materials of the linear low-density polyethylene resin b comprise polyethylene resin powder, a slipping agent and an opening agent; the mass ratio of the polyethylene resin powder, the slipping agent and the opening agent is 0.998:0.0008:0.001.
The preparation method of the polyethylene casting film comprises the following steps: adding the raw materials into an extruder according to the requirements for extrusion casting, wherein the extrusion amount of the extruder is 300 kg/h; extruder screw section processing temperature the temperatures in the first zone to the fifth zone are 145 ℃, 185 ℃, 200 ℃; a melt pump 195 ℃; the dispenser is 195 ℃; die 190 ℃. Extrusion parameters: a host rotation speed 45HZ melt pump 65HZ; winding parameters: traction is carried out at 15HZ, and rolling is carried out at 48HZ; and (3) cooling: the roll surface temperature was 25 ℃.
Comparative example 1
The contrast is a common polyethylene casting film, which comprises 25% of corona layer, 40% of middle layer and 25% of heat sealing layer by mass percent; the raw materials for preparing the corona layer and the middle layer are linear low-density polyethylene resin and high-pressure low-density polyethylene resin, and the linear low-density polyethylene resinThe brand of the polyethylene resin is 7042K; according to GB/T3682-2000 standard, the melt index is 2.0g/10min, and the density is 0.920g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The brand of the high-pressure low-density polyethylene resin is 2426K; according to GB/T3682-2000 standard, the melt index is 4g/10min, and the density is 0.924g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The raw materials of the heat sealing layer are linear low-density polyethylene resin and functional master batch linear low-density polyethylene resin with the brand of 7050 and the density of 0.918g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the According to GB/T3682-2000 standard, the melt index is 2.0g/10min; the mass ratio of the linear low density polyethylene to the functional master batch in the raw materials of the heat sealing layer is 98 percent: 2%.
The preparation method of the common polyethylene casting film comprises the following steps: adding the raw materials into an extruder according to the requirements for extrusion casting, wherein the extrusion amount of the extruder is 300 kg/h; extruder screw segment processing temperatures the temperatures in the first zone to the fifth zone were 195 ℃, 210 ℃, 220 ℃, 225 ℃, 230 ℃; a melt pump 220 ℃; a dispenser 220 ℃; the die is 220 ℃. Extrusion parameters: a host rotation speed 45HZ melt pump 65HZ; winding parameters: traction is carried out at 15HZ, and rolling is carried out at 48HZ; and (3) cooling: the roll surface temperature was 25 ℃.
Test example 1
The test example is the detection of the physical and chemical properties of the polyethylene casting film
The test method comprises the following steps: the polyethylene casting films prepared in the invention of the example 1, the example 2, the example 3 and the example 4 and the comparative example 1 are cut and rolled to finally prepare a finished CPE film, and the following physical and chemical properties are detected by conventional detection: gloss, clarity, haze, machine direction tensile strength, transverse direction tensile strength, thickness and width of polyethylene cast film.
The test results are shown in Table 1.
TABLE 1 physicochemical Properties of polyethylene cast film
As can be seen from table 1 above, the polyethylene cast films provided in examples 1 to 6 of the present invention have the same thickness and width as the conventional polyethylene cast film of comparative example 1, and the polyethylene cast films provided in examples 1 to 6 of the present invention have significantly higher gloss, transparency, longitudinal tensile strength and transverse tensile strength than comparative example 1, and have significantly lower haze than comparative example 1, so that it can be seen that the polyethylene cast film provided in the present invention has the advantages of high gloss, high transparency and high mechanical strength. According to the polyethylene casting film provided by the invention, the glossiness of the polyethylene casting film is more than or equal to 94 according to the ASTM D2457-2003 standard; according to GB/T2410-2008 standard, the transparency of the polyethylene casting film is more than or equal to 97%; according to the GB/T2410-2008 standard, the haze of the polyethylene casting film is less than or equal to 5%; according to the GB/T1040.3-2006 standard, the longitudinal tensile strength of the polyethylene casting film is more than or equal to 22MPa; according to the GB/T1040.3-2006 standard, the transverse tensile strength of the polyethylene casting film is more than or equal to 21MPa.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted equally without departing from the spirit and scope of the technical solution of the present invention.
Claims (4)
1. A polyethylene casting film, which is characterized by comprising 25-30% of a corona layer, 40-50% of an intermediate layer and 20-30% of a heat sealing layer in percentage by mass;
the preparation raw materials of the corona layer and the preparation raw materials of the intermediate layer comprise linear low-density polyethylene resin a, and the density of the linear low-density polyethylene resin a is 0.923-0.930g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The melt flow rate of the linear low density polyethylene resin a is 3-4g/10min according to the GB/T3682-2000 standard;
the raw materials for preparing the heat sealing layer comprise linear low-density polyethylene resin b, wherein the density of the linear low-density polyethylene resin b is 0.918-0.925g/cm 3 The method comprises the steps of carrying out a first treatment on the surface of the The melt flow rate of the linear low density polyethylene resin b is 3-4g/10min according to the GB/T3682-2000 standard; the preparation raw materials of the linear low-density polyethylene resin b comprise polyethyleneThe coating comprises vinyl resin powder, a slipping agent and an opening agent, wherein the mass ratio of the vinyl resin powder to the slipping agent to the opening agent is as follows: 0.982-0.998:0.0004-0.0008:0.0006-0.001;
and the density of the linear low density polyethylene a is greater than that of the linear low density polyethylene b;
the slipping agent is an amide compound, and the opening agent is nano silicon dioxide.
2. The polyethylene cast film of claim 1, wherein the polyethylene cast film has a gloss of greater than or equal to 94 according to ASTM D2457-2003; according to GB/T2410-2008 standard, the transparency of the polyethylene casting film is more than or equal to 97%; according to the GB/T2410-2008 standard, the haze of the polyethylene casting film is less than or equal to 5%; according to the GB/T1040.3-2006 standard, the longitudinal tensile strength of the polyethylene casting film is more than or equal to 22MPa; according to the GB/T1040.3-2006 standard, the transverse tensile strength of the polyethylene casting film is more than or equal to 21MPa.
3. A method for producing a polyethylene casting film according to any one of claims 1 to 2, comprising the steps of: adding the preparation raw materials into an extruder, and extruding and casting to obtain the preparation method of the polyethylene casting film; the extrusion amount of the extruder was 300 kg/hr; the temperature of the first region to the fifth region of the processing temperature of the screw section of the extruder is 145 ℃, 185 ℃, 200 ℃ respectively; a melt pump of the extruder at 195 ℃; a dispenser of the extruder at 195 ℃; the die of the extruder was 190 ℃.
4. A method of manufacture as claimed in claim 3 wherein the extruder has extrusion parameters of: the rotating speed of the machine is 45Hz, and the rotating speed of the melt pump is 65Hz; winding parameters of the extruder: the traction rate is 15Hz, and the winding rate is 48Hz; the cooling roll surface temperature of the extruder is 25-28 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011170918.2A CN112356543B (en) | 2020-10-28 | 2020-10-28 | High-gloss high-transparency polyethylene casting film and preparation method thereof |
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