CN112356543A - High-gloss and high-transparency polyethylene cast film and preparation method thereof - Google Patents
High-gloss and high-transparency polyethylene cast 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 cast film and a preparation method thereof, in particular to a high-gloss and high-transparency polyethylene cast film, belonging to the technical field of packaging materials. The invention provides a polyethylene casting film, which comprises, by mass, 25-30% of a corona layer, 40-50% of a middle layer and 20-30% of a heat sealing layer; 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 a slipping agent and an opening property. Compared with the existing polyethylene cast film, the polyethylene cast film provided by the invention has the advantages of high glossiness, high transparency and high mechanical strength, meets the appearance requirements of polyethylene cast film packaging manufacturers, has low processing temperature, can save energy consumption and increases enterprise benefits.
Description
Technical Field
The invention relates to a polyethylene cast film and a preparation method thereof, in particular to a high-gloss and high-transparency polyethylene cast film, belonging to the technical field of packaging materials.
Background
In recent years, with the development of the market, higher demands have been made on the quality of the film. The flatness and transparency of the film prepared by adopting a film blowing method are difficult to meet the requirements; the film manufactured by adopting the coextrusion composite cast film equipment has excellent heat sealing performance and flatness, good transparency, high yield and low unit energy consumption, is one of main packaging composite base materials, and is more and more popular with packaging printing production enterprises in China.
Cast film is a non-stretched, non-oriented cast film produced by melt cast quenching. Including PE casting film (CPE), divide into LLDPE, LDPE, HDPE casting film again, PET casting film, PVC casting film, PP casting film (CPP), EVA casting film, CPET casting film, PVB glass intermediate layer film etc.. The polyethylene cast film has good toughness, low temperature resistance, transparency, puncture resistance and good heat sealing performance, and is widely applied to the packaging industry. However, in the CPE packaging film, the requirements for gloss and transparency of the CPE film are high, and the manufacturers producing CPE increasingly pay more attention to the optical performance of the appearance of the CPE film, so that it is necessary to produce a high-gloss, high-transparency and high-stiffness polyethylene cast film.
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 purpose, the invention adopts the technical scheme that: the polyethylene casting film is characterized by comprising, by mass, 25-30% of a corona layer, 40-50% of an intermediate layer and 20-30% of a heat sealing layer; the raw materials for preparing the corona layer and the middle layer comprise linear low-density polyethylene resin a, and the raw materials for preparing 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 raw materials for preparing the corona layer and the intermediate layer are moderate in density and good in melt fluidity, and the prepared film is smooth, 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 smoothness and openness; the linear low-density polyethylene resin b is prepared by extruding and granulating pure polyethylene resin powder, an auxiliary agent slipping agent and an opening agent in the production process. The raw materials for preparing 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 adhesion resistance.
In a preferred embodiment of the cast polyethylene film according to the present invention, the mass ratio of the polyethylene resin powder, the slipping agent, and the opening agent is: 0.982-0.998:0.0004-0.0008:0.0006-0.001.
As a preferred embodiment of the polyethylene casting film of the present invention, the slipping agent is an amide compound, and the opening agent is nano silica.
As a preferred embodiment of the cast polyethylene film according to the present invention, the linear low density polyethylene resin a has a density of 0.923 to 0.930g/cm3(ii) a The melt flow rate of the linear low-density polyethylene resin a is 3-4g/10min according to the GB/T3682-2000 standard.
As a preferred embodiment of the cast polyethylene film according to the present invention, the linear low density polyethylene resin b has a density of 0.918 to 0.925g/cm3(ii) a The melt flow rate of the linear low-density polyethylene resin b is 3-4g/10min according to the GB/T3682-2000 standard.
As a preferred embodiment of the polyethylene cast film, the gloss of the polyethylene cast film is more than or equal to 94 according to ASTM D2457-2003.
As a preferable embodiment of the polyethylene casting film, the transparency of the polyethylene casting film is more than or equal to 97 percent according to the GB/T2410-2008 standard.
As a preferred embodiment of the polyethylene casting film, the haze of the polyethylene casting film is less than or equal to 5 percent according to the GB/T2410-2008 standard.
As a preferred embodiment of the polyethylene casting film, the longitudinal tensile strength of the polyethylene casting film is more than or equal to 22MPa according to the GB/T1040.3-2006 standard.
As a preferred embodiment of the polyethylene casting film, the transverse tensile strength of the polyethylene casting film is more than or equal to 21MPa according to the GB/T1040.3-2006 standard.
In addition, another object of the present invention is to provide the 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 capacity of the extruder is 300 kg/h; the processing temperature of the screw section of the extruder is respectively 145 ℃, 185 ℃, 200 ℃ and 200 ℃ from the first zone to the fifth zone; a melt pump 195 ℃ of the extruder; a distributor of the extruder 195 ℃; the die head of the extruder was 190 ℃.
As a preferable embodiment of the preparation method, the die temperature of the extruder is 190 ℃; the extrusion parameters of the extruder are as follows: the machine speed is 45HZ, and the melt pump is 65 HZ.
As a preferred embodiment of the preparation method of the present invention, the winding parameters of the extruder are: drawing 15HZ and rolling 48 HZ.
In a preferred embodiment of the preparation method of the present invention, the surface temperature of the cooling roller of the extruder is 25 to 28 ℃.
Compared with the prior art, the invention has the beneficial effects that:
(1) compared with the existing polyethylene cast film, the polyethylene cast film provided by the invention has the advantages of high glossiness, high transparency and high mechanical strength, meets the appearance requirements of polyethylene cast film packaging manufacturers, has low processing temperature, can save energy consumption and increase enterprise benefits;
(2) according to the polyethylene cast film provided by the invention, the preparation raw materials of the corona layer and the intermediate layer are moderate in density and good in melt fluidity, and the prepared film is smooth, 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 smoothness and opening property; the linear low-density polyethylene resin b is prepared by extruding and granulating pure polyethylene resin powder, an auxiliary agent slipping agent and an opening agent in the production process; the raw materials for preparing the heat sealing layer have low melting points, and the prepared film has the characteristics of low heat sealing temperature, good opening property and good adhesion resistance;
(3) according to the polyethylene casting film provided by the invention, according to the ASTM D2457-2003 standard, the glossiness of the polyethylene casting film is more than or equal to 94; according to the GB/T2410-2008 standard, the transparency of the polyethylene casting film is more than or equal to 97 percent; according to the GB/T2410-2008 standard, the haze of the polyethylene casting film is less than or equal to 5 percent; according to the GB/T1040.3-2006 standard, the longitudinal tensile strength of the polyethylene casting film is more than or equal to 22 MPa; according to the GB/T1040.3-2006 standard, the transverse tensile strength of the polyethylene casting film is more than or equal to 21 MPa.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples.
In the following examples, the slipping agent is an amide compound, and the opening agent is nano-silica.
Example 1
The embodiment is a polyethylene casting film, and the polyethylene casting film comprises, by mass, 25% of a corona layer, 50% of a middle layer and 25% of a heat-seal layer;
the raw materials for preparing the corona layer and the intermediate layer are linear low-density polyethylene resin a (the density is 0.928 g/cm)3(ii) a According to the GB/T3682-2000 standard, the melt index is 3.6g/10min), the raw material for preparing the heat sealing layer comprises linear low-density polyethylene resin b (the density is 0.923 g/cm)3(ii) a According to the GB/T3682-2000 standard, the melt index is 3.8g/10min), 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 requirements to extrude and cast, wherein the extrusion capacity of the extruder is 300 kg/h; the processing temperature of the screw section of the extruder is 145 ℃, 185 ℃, 200 ℃ and 200 ℃ from the first zone to the fifth zone; a melt pump 195 ℃; a distributor of 195 ℃; the die head is 190 ℃. Extrusion parameters: the rotating speed of the main engine is 45HZ, and the melt pump is 65 HZ; winding parameters: drawing 15HZ and rolling 48 HZ; and (3) cooling: the roll surface temperature was 25 ℃.
Example 2
The embodiment is a polyethylene casting film, and the polyethylene casting film comprises, by mass, a corona layer 30%, an intermediate layer 50% and a heat-seal layer 20%;
the raw materials for preparing the corona layer and the intermediate layer are linear low-density polyethylene resin a (the density is 0.928 g/cm)3(ii) a According to the GB/T3682-2000 standard, the melt index is 3.6g/10min), the raw material for preparing the heat sealing layer comprises linear low-density polyethylene resin b (the density is 0.923 g/cm)3(ii) a According to the 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 0.998:0.0008: 0.001.
The preparation method of the polyethylene casting film comprises the following steps: adding the raw materials into an extruder according to requirements for extrusion casting, wherein the extrusion capacity of the extruder is 300 kg/h; the processing temperature of the screw section of the extruder is 145 ℃, 185 ℃, 200 ℃ and 200 ℃ from the first zone to the fifth zone; a melt pump 195 ℃; a distributor of 195 ℃; the die head is 190 ℃. Extrusion parameters: the rotating speed of the main engine is 45HZ, and the melt pump is 65 HZ; winding parameters: drawing 15HZ and rolling 48 HZ; and (3) cooling: the roll surface temperature was 25 ℃.
Example 3
The embodiment is a polyethylene casting film, and the polyethylene casting film comprises, by mass, a corona layer 30%, an intermediate layer 50% and a heat-seal layer 20%;
the electricityThe raw materials for preparing the corona layer and the intermediate layer are linear low-density polyethylene resin a (density of 0.928 g/cm)3(ii) a According to the GB/T3682-2000 standard, the melt index is 3.6g/10min), the raw material for preparing the heat sealing layer comprises linear low-density polyethylene resin b (the density is 0.923 g/cm)3(ii) a According to the 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 requirements for extrusion casting, wherein the extrusion capacity of the extruder is 300 kg/h; the processing temperature of the screw section of the extruder is 145 ℃, 185 ℃, 200 ℃ and 200 ℃ from the first zone to the fifth zone; a melt pump 195 ℃; a distributor of 195 ℃; the die head is 190 ℃. Extrusion parameters: the rotating speed of the main engine is 45HZ, and the melt pump is 65 HZ; winding parameters: drawing 15HZ and rolling 48 HZ; and (3) cooling: the roll surface temperature was 25 ℃.
Example 4
The embodiment is a polyethylene casting film, and the polyethylene casting film comprises, by mass, a corona layer 30%, an intermediate layer 40% and a heat-seal layer 30%;
the raw materials for preparing the corona layer and the intermediate layer are linear low-density polyethylene resin a (the density is 0.928 g/cm)3(ii) a According to the GB/T3682-2000 standard, the melt index is 3.6g/10min), the raw material for preparing the heat sealing layer comprises linear low-density polyethylene resin b (the density is 0.923 g/cm)3(ii) a According to the 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 requirements for extrusion casting, wherein the extrusion capacity of the extruder is 300 kg/h; the processing temperature of the screw section of the extruder is 145 ℃, 185 ℃, 200 ℃ and 200 ℃ from the first zone to the fifth zone; a melt pump 195 ℃; a distributor of 195 ℃; the die head is 190 ℃. Extrusion parameters: the rotating speed of the main engine is 45HZ, and the melt pump is 65 HZ; winding parameters: drawing 15HZ and rolling 48 HZ; and (3) cooling: the roll surface temperature was 28 ℃.
Example 5
This embodiment is a polyethylene casting film of the present invention, which comprises, by mass, a corona layer 28%, an intermediate layer 40%, and a heat-seal layer 22%;
the raw materials for preparing the corona layer and the intermediate layer are linear low-density polyethylene resin a (the density is 0.923 g/cm)3(ii) a According to the GB/T3682-2000 standard, the melt index is 3g/10min), the preparation raw material of the heat sealing layer comprises linear low-density polyethylene resin b (the density is 0.918 g/cm)3(ii) a According to the 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 requirements for extrusion casting, wherein the extrusion capacity of the extruder is 300 kg/h; the processing temperature of the screw section of the extruder is 145 ℃, 185 ℃, 200 ℃ and 200 ℃ from the first zone to the fifth zone; a melt pump 195 ℃; a distributor of 195 ℃; the die head is 190 ℃. Extrusion parameters: the rotating speed of the main engine is 45HZ, and the melt pump is 65 HZ; winding parameters: drawing 15HZ and rolling 48 HZ; and (3) cooling: the roll surface temperature was 26 ℃.
Example 6
The embodiment is a polyethylene casting film, and the polyethylene casting film comprises, by mass, 25% of a corona layer, 50% of a middle layer and 25% of a heat-seal layer;
the raw materials for preparing the corona layer and the intermediate layer are linear low-density polyethylene resin a (the density is 0.925 g/cm)3(ii) a According to the GB/T3682-2000 standard, the melt index is 4g/10min), and the preparation raw material of the heat sealing layer comprises linear low-density polyethylene resin b (the density is 0.923 g/cm)3(ii) a 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 to the slipping agent to 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 requirements for extrusion casting, wherein the extrusion capacity of the extruder is 300 kg/h; the processing temperature of the screw section of the extruder is 145 ℃, 185 ℃, 200 ℃ and 200 ℃ from the first zone to the fifth zone; a melt pump 195 ℃; a distributor of 195 ℃; the die head is 190 ℃. Extrusion parameters: the rotating speed of the main engine is 45HZ, and the melt pump is 65 HZ; winding parameters: drawing 15HZ and rolling 48 HZ; and (3) cooling: the roll surface temperature was 25 ℃.
Comparative example 1
The contrast is a common polyethylene casting film, and the polyethylene casting film comprises 25% of a corona layer, 40% of a middle layer and 25% of a heat sealing layer in percentage by mass; the corona layer and the middle layer are made of linear low-density polyethylene resin and high-pressure low-density polyethylene resin, and the grade of the linear low-density polyethylene resin is 7042K; according to the GB/T3682-2000-one standard, the melt index is 2.0g/10min, and the density is 0.920g/cm3(ii) a The high-pressure low-density polyethylene resin is 2426K; according to the GB/T3682-2000 standard, the melt index is 4g/10min, and the density is 0.924g/cm3(ii) a The heat sealing layer is made of linear low-density polyethylene resin and functional master batch linear low-density polyethylene resin with the trade name of 7050 and the density of 0.918g/cm3(ii) a According to the GB/T3682-2000 standard, the melt index is 2.0g/10 min; 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%: 2 percent.
The preparation method of the common polyethylene casting film comprises the following steps: adding the raw materials into an extruder according to requirements for extrusion casting, wherein the extrusion capacity of the extruder is 300 kg/h; the processing temperature of the screw section of the extruder is 195 ℃, 210 ℃, 220 ℃, 225 ℃ and 230 ℃ in the first zone to the fifth zone; a melt pump at 220 ℃; a distributor at 220 ℃; the die head was 220 ℃. Extrusion parameters: the rotating speed of the main engine is 45HZ, and the melt pump is 65 HZ; winding parameters: drawing 15HZ and rolling 48 HZ; 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 polyethylene cast film
The test method comprises the following steps: the polyethylene casting films prepared in the invention in the embodiment 1, the embodiment 2, the embodiment 3 and the embodiment 4 and the comparative example 1 are cut and rolled to prepare a finished CPE film, and the following physical and chemical properties are detected by a conventional detection method: 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 physical and chemical Properties of cast polyethylene films
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 common polyethylene cast film of comparative example 1, and the gloss, transparency, machine direction tensile strength and transverse direction tensile strength of the polyethylene cast films provided in examples 1 to 6 of the present invention are all significantly higher than those of comparative example 1, and the haze thereof is significantly lower than that of comparative example 1, so that the polyethylene cast films provided by the present invention have the advantages of high gloss, high transparency and high mechanical strength. According to the polyethylene casting film provided by the invention, according to the ASTM D2457-2003 standard, the glossiness of the polyethylene casting film is more than or equal to 94; according to the GB/T2410-2008 standard, the transparency of the polyethylene casting film is more than or equal to 97 percent; according to the GB/T2410-2008 standard, the haze of the polyethylene casting film is less than or equal to 5 percent; according to the GB/T1040.3-2006 standard, the longitudinal tensile strength of the polyethylene casting film is more than or equal to 22 MPa; according to the GB/T1040.3-2006 standard, the transverse tensile strength of the polyethylene casting film is more than or equal to 21 MPa.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (8)
1. The polyethylene casting film is characterized by comprising, by mass, 25-30% of a corona layer, 40-50% of an intermediate layer and 20-30% of a heat sealing layer;
the raw materials for preparing the corona layer and the middle layer comprise linear low-density polyethylene resin a, and the raw materials for preparing 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.
2. The cast polyethylene film according to claim 1, wherein the mass ratio of the polyethylene resin powder, the slipping agent and the opening agent is: 0.982-0.998:0.0004-0.0008:0.0006-0.001.
3. The cast polyethylene film according to claim 2, wherein the slip agent is an amide compound and the opening agent is nanosilica.
4. The cast polyethylene film according to claim 1, wherein the linear low density polyethylene resin a has a density of 0.923 to 0.930g/cm3(ii) a The melt flow rate of the linear low-density polyethylene resin a is 3-4g/10min according to the GB/T3682-2000 standard.
5. Cast polyethylene film according to claim 1, wherein the linear low density polyethylene resin b has a density of 0.918 to 0.925g/cm3(ii) a The melt flow rate of the linear low-density polyethylene resin b is 3-4g/10min according to the GB/T3682-2000 standard.
6. Cast polyethylene film according to any of claims 1 to 5, wherein said cast polyethylene film has a gloss of 94 or more according to ASTM D2457-2003; according to the GB/T2410-2008 standard, the transparency of the polyethylene casting film is more than or equal to 97 percent; according to the GB/T2410-2008 standard, the haze of the polyethylene casting film is less than or equal to 5 percent; according to the GB/T1040.3-2006 standard, the longitudinal tensile strength of the polyethylene casting film is more than or equal to 22 MPa; according to the GB/T1040.3-2006 standard, the transverse tensile strength of the polyethylene casting film is more than or equal to 21 MPa.
7. A process for the production of cast polyethylene film according to any of claims 1 to 6, characterized by 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 capacity of the extruder is 300 kg/h; the processing temperature of the screw section of the extruder is respectively 145 ℃, 185 ℃, 200 ℃ and 200 ℃ from the first zone to the fifth zone; a melt pump 195 ℃ of the extruder; a distributor of the extruder 195 ℃; the die head of the extruder was 190 ℃.
8. The method of claim 7, wherein the extruder has extrusion parameters of: the rotating speed of the machine is 45HZ, and the rotating speed of the melt pump is 65 HZ; the winding parameters of the extruder are as follows: the traction rate is 15HZ, and the winding rate is 48 HZ; the surface temperature of the cooling roller of the extruder is 25-28 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| 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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| CN114181339A (en) * | 2021-12-21 | 2022-03-15 | 上海赛科石油化工有限责任公司 | Linear low-density polyethylene resin for tape casting and preparation method thereof |
| CN116285075A (en) * | 2023-02-09 | 2023-06-23 | 克林斯曼新材料有限公司 | Polyethylene material with high printing performance and preparation method and application thereof |
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