阅读说明：本技术 一种高阻隔镀铝聚乙烯薄膜的制备方法 (Preparation method of high-barrier aluminized polyethylene film ) 是由 叶利庭 庞柳明 吴房贵 于 2020-12-15 设计创作，主要内容包括：本发明公开了一种高阻隔镀铝聚乙烯薄膜的制备方法,包括以下步骤：S1、对聚乙烯薄膜的表面进行预处理；S2、在聚乙烯薄膜的表面辊涂底涂层；S3、将经过步骤S2处理后的聚乙烯薄膜进行收卷,收卷以后做时效处理；S4、将经过步骤S3处理后的聚乙烯薄膜采用真空蒸镀工艺蒸镀氧化铝膜；S5、将经过步骤S4处理后的聚乙烯薄膜进行收卷,收卷以后做时效处理；S6、将经过步骤S5处理后的聚乙烯薄膜进行分切。本发明采用上述高阻隔镀铝聚乙烯薄膜的制备方法,能够解决现有的聚乙烯薄膜阻隔性能差的问题。(The invention discloses a preparation method of a high-barrier aluminized polyethylene film, which comprises the following steps: s1, pretreating the surface of the polyethylene film; s2, rolling a bottom coating on the surface of the polyethylene film; s3, rolling the polyethylene film processed in the step S2, and performing aging treatment after rolling; s4, evaporating the polyethylene film processed in the step S3 into an aluminum oxide film by adopting a vacuum evaporation process; s5, rolling the polyethylene film processed in the step S4, and performing aging treatment after rolling; and S6, slitting the polyethylene film processed in the step S5. The preparation method of the high-barrier aluminized polyethylene film can solve the problem that the existing polyethylene film is poor in barrier property.)

1. A preparation method of a high-barrier aluminized polyethylene film is characterized by comprising the following steps:

s1, pretreating the surface of the polyethylene film;

s2, rolling a bottom coating on the surface of the polyethylene film;

s3, rolling the polyethylene film processed in the step S2, and performing aging treatment after rolling;

s4, evaporating the polyethylene film processed in the step S3 into an aluminum oxide film by adopting a vacuum evaporation process;

s5, rolling the polyethylene film processed in the step S4, and performing aging treatment after rolling;

and S6, slitting the polyethylene film processed in the step S5.

2. The method for preparing a high-barrier aluminized polyethylene film according to claim 1, characterized in that: the pretreatment of the step S1 is to carry out corona treatment on the polyethylene film.

3. The method for preparing a high-barrier aluminized polyethylene film according to claim 1, characterized in that: in the step S2, the polyethylene film is dried after the primer is roll-coated, the drying temperature is increased stepwise, the temperature of each drying stage is 70 ℃, 80 ℃, 90 ℃ and 100 ℃, and the length of each drying stage is 10 m; the roller coating speed is 30-80 m/min.

4. The method for preparing a high-barrier aluminized polyethylene film according to claim 1, characterized in that: in step S2, the primer layer is a polyurethane series two-component coating, component a: and (B) component: alcohol: the mass percentage of the water is 8-12:0.5-1.5:3-7: 20-30.

5. The method for preparing a high-barrier aluminized polyethylene film according to claim 4, wherein: the primer layer comprises the following components: and (B) component: alcohol: the mass percentage of water is preferably 10:1:5: 25.

6. The method for preparing a high-barrier aluminized polyethylene film according to claim 1, characterized in that: in the step S3, the winding tension is 10-30N; the temperature of the aging treatment is 35-50 ℃, and the time of the aging treatment is 24-48 h.

7. The method for preparing a high-barrier aluminized polyethylene film according to claim 1, characterized in that: in the step S4, the preheating temperature of the evaporation boat is 900-^-4MPa, the wire feeding speed of the aluminum wire is 500-1500mm/min, and the evaporation speed of the polyethylene film is 300-500 m/min.

8. The method for preparing a high-barrier aluminized polyethylene film according to claim 1, characterized in that: in step S4, a plasma torch is used to perform plasma treatment on the surface of the polyethylene film before the polyethylene film is subjected to vapor deposition, so as to remove foreign matters or dust on the surface of the polyethylene film, wherein the power of the plasma torch is 2-4 KW.

9. The method for preparing a high-barrier aluminized polyethylene film according to claim 1, characterized in that: in the step S5, the winding tension is 80-200N; the aging treatment time is 24-72h, and the aging treatment temperature is 35-50 ℃.

Technical Field

The invention relates to the technical field of polyethylene film preparation, in particular to a preparation method of a high-barrier aluminized polyethylene film.

Background

The polyethylene film is made of polyethylene, and the sanitary performance of the polyethylene film meets the requirement of food packaging. The polyethylene film has high air permeability, and products with different properties such as low-density, medium-density and high-density polyethylene, crosslinked polyethylene and the like can be manufactured according to different manufacturing methods and control means. The barrier property of the polyethylene film is poor, which hinders the application of the polyethylene film.

Disclosure of Invention

The invention aims to provide a preparation method of a high-barrier aluminized polyethylene film, which solves the problem of poor barrier property of the existing polyethylene film.

In order to realize the purpose, the invention provides a preparation method of a high-barrier aluminized polyethylene film, which comprises the following steps:

s1, pretreating the surface of the polyethylene film;

s2, rolling a bottom coating on the surface of the polyethylene film;

s3, rolling the polyethylene film processed in the step S2, and performing aging treatment after rolling;

s4, evaporating the polyethylene film processed in the step S3 into an aluminum oxide film by adopting a vacuum evaporation process;

s5, rolling the polyethylene film processed in the step S4, and performing aging treatment after rolling;

and S6, slitting the polyethylene film processed in the step S5.

Preferably, the pretreatment of step S1 is to perform corona treatment on the polyethylene film.

Preferably, in step S2, after the primer layer is roll-coated, the polyethylene film is dried, the drying temperature is increased in a stepwise manner, the temperature of each drying stage is 70 ℃, 80 ℃, 90 ℃ and 100 ℃, and the length of each drying stage is 10 m; the roller coating speed is 30-80 m/min.

Preferably, in step S2, the primer coating is a polyurethane-based two-component coating, component a: and (B) component: alcohol: the mass percentage of the water is 8-12:0.5-1.5:3-7: 20-30.

Preferably, the primer layer comprises component a: and (B) component: alcohol: the mass percentage of water is preferably 10:1:5: 25.

Preferably, in the step S3, the winding tension is 10 to 30N; the temperature of the aging treatment is 35-50 ℃, and the time of the aging treatment is 24-48 h.

Preferably, in the step S4, the preheating temperature of the evaporation boat is 900-^-4MPa, the wire feeding speed of the aluminum wire is 500-1500mm/min, and the evaporation speed of the polyethylene film is 300-500 m/min.

Preferably, in step S4, before the deposition of the polyethylene film, a plasma torch is used to perform a plasma treatment on the surface of the polyethylene film to remove the foreign matters or dust on the surface of the polyethylene film, wherein the power of the plasma torch is 2-4 KW.

Preferably, in the step S5, the winding tension is 80 to 200N; the aging treatment time is 24-72h, and the aging treatment temperature is 35-50 ℃.

According to the preparation method of the high-barrier aluminized polyethylene film, the polyethylene film is firstly coated with the bottom coating in a rolling way, so that the adhesive force between the aluminum oxide film and the polyethylene film is improved, and the adhesive force of the aluminum oxide film is improved. The barrier property of the polyethylene film can be improved by arranging a bottom coating layer between the polyethylene film and the aluminum oxide film.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of a method for preparing a high-barrier aluminized polyethylene film according to the present invention.

Reference numerals

1. A polyethylene film; 2. a primer layer; 3. and (3) an aluminum oxide film.

Detailed Description

The technical solution of the present invention is further illustrated by the accompanying drawings and examples.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

FIG. 1 is a schematic structural diagram of an embodiment of a method for preparing a high-barrier aluminized polyethylene film according to the present invention. As shown in the figure, the high-barrier aluminized polyethylene film comprises a polyethylene film, an aluminum oxide film is arranged outside the polyethylene film, a bottom coating is arranged between the aluminum oxide film and the polyethylene film, and the bottom coating improves the bonding strength between the polyethylene film and the aluminum oxide film; and the arrangement of the base coat can also improve the barrier property of the polyethylene film.

The preparation method of the high-barrier aluminized polyethylene film comprises the following steps:

and S1, pretreating the surface of the polyethylene film. The pretreatment is to carry out corona treatment on the polyethylene film, the polyethylene film is a non-polar plastic film, the film passes between two electrodes with high voltage, the high voltage ionizes air between the electrodes to generate electron current between the electrodes, an oxidation polarization group is formed on the surface of the film to generate polarity on the surface of the film, the tension of the surface of the polyethylene film is improved, and the adhesive force of the polyethylene film is improved. Under the high-frequency electric arc impact of the polyethylene film, the original smooth film surface becomes rough, and the film surface adhesion is improved. The electric arc generates ozone when breaking down air, the ozone is a very strong oxidant, so that the surface of the polyethylene film is slightly oxidized, the film generates polarity, and the adhesive force of the coating on the film is improved.

And S2, rolling a bottom coating on the surface of the polyethylene film. The roller coating of the base coat is to put the base coat paint into a container, adhere the paint on the surface of a roller in the rotating process of the roller, pass a film between the two rollers, transfer the paint on the roller to the film and realize the coating of the base coat on the polyethylene film. The roller coating speed is 30-80m/min, namely the movement speed of the polyethylene film is 30-80 m/min.

After the bottom coating is coated by the roller, the polyethylene film is dried, the drying temperature is increased in a step mode, the temperature of each drying stage is 70 ℃, 80 ℃, 90 ℃ and 100 ℃, and the total number of the drying stages is 4. The polyethylene film is dried, namely the polyethylene film coated with the base coat passes through each drying stage at a constant speed in sequence on a production line, and the length of each drying stage is 10 m. The polyethylene film is dried by adopting 4 stepwise increased temperatures, so that the drying is more sufficient, the problem that the inner stress of the base coat is larger due to severe temperature change can be avoided, and the adhesive strength between the base coat and the polyethylene film substrate is improved.

The base coat is a polyurethane series two-component coating, and the component A: and (B) component: alcohol: the mass percentage of the water is 8-12:0.5-1.5:3-7: 20-30. And (2) component A: and (B) component: alcohol: the mass percentage of water is preferably 10:1:5: 25. The polyurethane series two-component coating is selected from the existing coating sold in the market, such as 911 polyurethane waterproof coating.

And S3, rolling the polyethylene film treated in the step S2, and performing aging treatment after rolling. The winding tension is 10-30N. The temperature of the aging treatment is 35-50 ℃, and the time of the aging treatment is 24-48 h. In the aging treatment process, the migration additive in the polyethylene film can be separated out on the surface of the film, the performances of static resistance, friction coefficient and the like of the surface are changed, the surface tension after corona treatment can be gradually reduced and tends to be stable, and the shape and size stability of the polyethylene film can be improved.

And S4, evaporating the polyethylene film processed in the step S3 into an aluminum oxide film by adopting a vacuum evaporation process. The preheating temperature of the evaporation boat is 900-^-4MPa. The wire feeding speed of the aluminum wire is 500-1500 mm/min. Poly(s) are polymerizedThe evaporation speed of the ethylene film is 300-500m/min, namely the moving speed of the polyethylene film is 300-500 m/min.

Before the polyethylene film is subjected to vapor deposition, a plasma spray gun is adopted to carry out plasma treatment on the surface of the polyethylene film so as to remove foreign matters or dust on the surface of the film, and the power of the plasma spray gun is 2-4 KW.

And S5, rolling the polyethylene film treated in the step S4, and performing aging treatment after rolling. The winding tension is 80-200N; the aging treatment time is 24-72h, and the aging treatment temperature is 35-50 ℃.

And S6, slitting the polyethylene film processed in the step S5.

Example one

And S1, pretreating the surface of the polyethylene film. The pretreatment is to carry out corona treatment on the polyethylene film.

And S2, rolling a bottom coating on the surface of the polyethylene film. The roller coating speed is 35m/min, namely the moving speed of the polyethylene film is 35 m/min.

After the bottom coating is coated by the roller, the polyethylene film is dried, the drying temperature is increased in a step mode, the temperature of each drying stage is 70 ℃, 80 ℃, 90 ℃ and 100 ℃, and the total number of the drying stages is 4. The polyethylene film is dried, namely the polyethylene film coated with the base coat passes through each drying stage at a constant speed in sequence on a production line, and the length of each drying stage is 10 m. The time taken for the polyethylene film to pass through each drying stage was 17 seconds.

The base coat is a polyurethane series two-component coating, and the component A: and (B) component: alcohol: the mass percentage of the water is 9:0.5:4: 28. The polyurethane series two-component coating is selected from the existing coating sold in the market, such as 911 polyurethane waterproof coating.

And S3, rolling the polyethylene film treated in the step S2, and performing aging treatment after rolling. The winding tension is 12N. The temperature of the aging treatment is 40 ℃, and the time of the aging treatment is 26 h.

And S4, evaporating the polyethylene film processed in the step S3 into an aluminum oxide film by adopting a vacuum evaporation process. The preheating temperature of the evaporation boat is 1000 ℃, and the vacuum degree is 2 multiplied by 10^-4MPa。The wire feeding speed of the aluminum wire is 800 mm/min. The deposition rate of the polyethylene film was 500m/min, i.e., the moving speed of the polyethylene film was 500 m/min.

Before the polyethylene film is subjected to evaporation, a plasma spray gun is adopted to perform plasma treatment on the surface of the polyethylene film to remove foreign matters or dust on the surface of the film, and the power of the plasma spray gun is 2 KW.

And S5, rolling the polyethylene film treated in the step S4, and performing aging treatment after rolling. The winding tension is 80N; the aging treatment time is 25h, and the aging treatment temperature is 40 ℃.

And S6, slitting the polyethylene film processed in the step S5.

The high-barrier aluminized polyethylene film prepared by the preparation method of the high-barrier aluminized polyethylene film prepared by the method has the thickness of 45 mu m. According to GB/T1040.3-2006, the tensile strength and the elongation at break of the high-barrier aluminum-plated polyethylene film are detected, wherein the longitudinal tensile strength is 141MPa, the transverse tensile strength is 220MPa, the longitudinal elongation at break is 137%, and the transverse elongation at break is 49%.

According to GB/T19789-2005, the oxygen transmission rate of the high-barrier aluminized polyethylene film is detected, and the oxygen transmission rate is 10.92ml/m²·day。

Detecting the water vapor transmission rate of the high-barrier aluminized polyethylene film according to the national standard GB/T26253-2010, wherein the water vapor transmission rate is 0.06g/m²·day。

The surface tension of the treated surface of the high-barrier aluminized polyethylene film is detected according to GB/T14216-2008, and the surface tension is 40 dyne value.

Heat-sealing at 130 ℃ under a pressure of 0.3MPa for 0.5s to obtain a heat-seal strength of 7N/15 mm.

Example two

And S1, pretreating the surface of the polyethylene film. The pretreatment is to carry out corona treatment on the polyethylene film.

And S2, rolling a bottom coating on the surface of the polyethylene film. The roll coating speed is 60m/min, namely the moving speed of the polyethylene film is 60 m/min.

After the bottom coating is coated by the roller, the polyethylene film is dried, the drying temperature is increased in a step mode, the temperature of each drying stage is 70 ℃, 80 ℃, 90 ℃ and 100 ℃, and the total number of the drying stages is 4. The polyethylene film is dried, namely the polyethylene film coated with the base coat passes through each drying stage at a constant speed in sequence on a production line, and the length of each drying stage is 10 m. The time for the polyethylene film to pass through each drying stage was 10 seconds.

The base coat is a polyurethane series two-component coating, and the component A: and (B) component: alcohol: the mass percentage of the water is 10:1:5: 25. The polyurethane series two-component coating is selected from the existing coating sold in the market, such as 911 polyurethane waterproof coating.

And S3, rolling the polyethylene film treated in the step S2, and performing aging treatment after rolling. The winding tension is 16N. The temperature of the aging treatment is 45 ℃, and the time of the aging treatment is 36 h.

And S4, evaporating the polyethylene film processed in the step S3 into an aluminum oxide film by adopting a vacuum evaporation process. The preheating temperature of the evaporation boat is 1100 ℃, and the vacuum degree is 3 multiplied by 10^-4MPa. The wire feeding speed of the aluminum wire is 1200 mm/min. The deposition rate of the polyethylene film was 400m/min, i.e., the moving speed of the polyethylene film was 400 m/min.

Before the polyethylene film is subjected to evaporation, a plasma spray gun is adopted to perform plasma treatment on the surface of the polyethylene film to remove foreign matters or dust on the surface of the film, and the power of the plasma spray gun is 4 KW.

And S5, rolling the polyethylene film treated in the step S4, and performing aging treatment after rolling. The winding tension is 150N; the aging treatment time is 48h, and the aging treatment temperature is 45 ℃.

And S6, slitting the polyethylene film processed in the step S5.

The high-barrier aluminized polyethylene film prepared by the preparation method of the high-barrier aluminized polyethylene film prepared by the method has the thickness of 45 mu m. According to GB/T1040.3-2006, the tensile strength and the elongation at break of the high-barrier aluminum-plated polyethylene film are detected, wherein the longitudinal tensile strength is 145MPa, the transverse tensile strength is 223MPa, the longitudinal elongation at break is 135%, and the transverse elongation at break is 48%.

According to GB/T19789-2005, the oxygen transmission rate of the high-barrier aluminized polyethylene film is detected, and the oxygen transmission rate is 10.88ml/m²·day。

Detecting the water vapor transmission rate of the high-barrier aluminized polyethylene film according to the national standard GB/T26253-2010, wherein the water vapor transmission rate is 0.05g/m²·day。

The surface tension of the treated surface of the high-barrier aluminized polyethylene film is detected according to GB/T14216-2008, and the surface tension is 42 dyne value.

Heat-sealing at 130 ℃ under a pressure of 0.3MPa for 0.5s to obtain a heat-seal strength of 7N/15 mm.

EXAMPLE III

And S1, pretreating the surface of the polyethylene film. The pretreatment is to carry out corona treatment on the polyethylene film.

And S2, rolling a bottom coating on the surface of the polyethylene film. The roller coating speed is 80m/min, namely the moving speed of the polyethylene film is 80 m/min.

After the bottom coating is coated by the roller, the polyethylene film is dried, the drying temperature is increased in a step mode, the temperature of each drying stage is 70 ℃, 80 ℃, 90 ℃ and 100 ℃, and the total number of the drying stages is 4. The polyethylene film is dried, namely the polyethylene film coated with the base coat passes through each drying stage at a constant speed in sequence on a production line, and the length of each drying stage is 10 m. The time for the polyethylene film to pass through each drying stage was 8 s.

The base coat is a polyurethane series two-component coating, and the component A: and (B) component: alcohol: the mass percentage of the water is 12:1.4:4: 20. The polyurethane series two-component coating is selected from the existing coating sold in the market, such as 911 polyurethane waterproof coating.

And S3, rolling the polyethylene film treated in the step S2, and performing aging treatment after rolling. The winding tension is 18N. The temperature of the aging treatment is 35 ℃, and the time of the aging treatment is 48 h.

And S4, evaporating the polyethylene film processed in the step S3 into an aluminum oxide film by adopting a vacuum evaporation process. The preheating temperature of the evaporation boat is 900 ℃, and the vacuum degree is 4 multiplied by 10^-4MPa. The wire feeding speed of the aluminum wire is 1200 mm/min. The deposition rate of the polyethylene film was 400m/min, i.e., the moving speed of the polyethylene film was 400 m/min.

Before the polyethylene film is subjected to evaporation, a plasma spray gun is adopted to perform plasma treatment on the surface of the polyethylene film to remove foreign matters or dust on the surface of the film, and the power of the plasma spray gun is 2 KW.

And S5, rolling the polyethylene film treated in the step S4, and performing aging treatment after rolling. The winding tension is 180N; the aging treatment time is 72h, and the aging treatment temperature is 35 ℃.

And S6, slitting the polyethylene film processed in the step S5.

The thickness of the high-barrier aluminized polyethylene film prepared by the preparation method of the high-barrier aluminized polyethylene film prepared by the method is 45 mu m. According to GB/T1040.3-2006, the tensile strength and the elongation at break of the high-barrier aluminized polyethylene film are detected, wherein the longitudinal tensile strength is 138MPa, the transverse tensile strength is 219MPa, the longitudinal elongation at break is 138%, and the transverse elongation at break is 49%.

According to GB/T19789-2005, the oxygen transmission rate of the high-barrier aluminized polyethylene film is detected, and the oxygen transmission rate is 10.94ml/m²·day。

Detecting the water vapor transmission rate of the high-barrier aluminized polyethylene film according to the national standard GB/T26253-2010, wherein the water vapor transmission rate is 0.06g/m²·day。

The surface tension of the treated surface of the high-barrier aluminized polyethylene film is detected according to GB/T14216-2008, and the surface tension is 40 dyne value.

Heat-sealing at 130 ℃ under a pressure of 0.3MPa for 0.5s to obtain a heat-seal strength of 7N/15 mm.

Therefore, the preparation method of the high-barrier aluminized polyethylene film can solve the problem that the existing polyethylene film is poor in barrier property.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the invention without departing from the spirit and scope of the invention.