High-tear-resistance polyethylene polymer composite film as well as preparation method and application thereof

Abstract

The invention discloses a high-tear-resistance polyethylene polymer composite film as well as a preparation method and application thereof, and belongs to the technical field of packaging materials. The high-tear-resistance polyethylene polymer composite film comprises an inner-layer polyethylene film and an outer-layer polyethylene film, the inner-layer polyethylene film and the outer-layer polyethylene film are adhered and compounded through an adhesive; the inner-layer polyethylene film comprises the following components: low-density polyethylene, metallocene low-density polyethylene, high-density polyethylene and polyamide nylon resin; and the outer polyethylene film comprises the following components: low-density polyethylene, metallocene low-density polyethylene, high-density polyethylene and polyamide nylon resin. The high-tear-resistance polyethylene polymer composite film is transparent in appearance, low in haze and excellent in mechanical property, and can be widely applied to the fields of metal profiles, wood profiles, carbon profiles, plastic profiles and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging materials, and in particular to a high-tear-resistant polyethylene polymer composite film, a preparation method thereof, and an application thereof. Background Art

[0002] Polymer film is generally a polymer film obtained by processes such as blown film molding from plastic masterbatches such as polymer plastics such as polyethylene (PE), polyvinyl chloride (PVC), polypropylene (PP) and polyester (PET). Some polymer film surfaces usually also need to be printed and coated with certain graphics, trademarks and special logos. If they are not protected, they are very easy to be damaged during use and affect the use effect. In order to effectively protect the ink pattern layer, it is necessary to print and coat a special adhesive on its surface and then stick a layer of transparent polymer plastic film to obtain a polymer composite film. At present, as an important type of packaging material, polymer composite films have been applied in almost all aspects of production and life. However, there are still widespread problems such as poor composite strength, especially when soaked in water, low bonding strength between layers, easy cracking, etc., and therefore cannot fully meet market demand. Summary of the Invention

[0003] The purpose of the present invention is to provide a high-tear-resistant polyethylene polymer composite film and a preparation method and application thereof, so as to solve the problems existing in the above-mentioned prior art.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] One of the technical solutions of the present invention is a highly tear-resistant polyethylene polymer composite film, comprising an inner polyethylene film and an outer polyethylene film; the inner polyethylene film and the outer polyethylene film are bonded together by an adhesive;

[0006] The inner polyethylene film comprises the following components, calculated in parts by weight: 50.0 to 85.0 parts of low-density polyethylene, 10.0 to 30.0 parts of metallocene low-density polyethylene, 5.0 to 15.0 parts of high-density polyethylene, and 1.0 to 10.0 parts of polyamide nylon resin;

[0007] The outer polyethylene film comprises the following components in parts by weight: 40.0-80.0 parts of low-density polyethylene, 15.0-40.0 parts of metallocene low-density polyethylene, 1.0-10.0 parts of high-density polyethylene and 1.0-5.0 parts of polyamide nylon resin.

[0008] Furthermore, the inner polyethylene film comprises the following components, in parts by weight: 50.0 to 80.0 parts of low-density polyethylene, 10.0 to 20.0 parts of metallocene low-density polyethylene, 5.0 to 10.0 parts of high-density polyethylene, and 1.0 to 5.0 parts of polyamide nylon resin;

[0009] The outer polyethylene film comprises the following components in parts by weight: 40.0-70.0 parts of low-density polyethylene, 20.0-35.0 parts of metallocene low-density polyethylene, 1.0-5.0 parts of high-density polyethylene and 1.0-3.0 parts of polyamide nylon resin.

[0010] Furthermore, the weight percentages of the inner polyethylene film, the outer polyethylene film and the adhesive are 97%, 2.5% and 0.5% respectively, and the total is 100%.

[0011] Furthermore, the low-density polyethylene has a melt index of 1.10 to 1.45 g / min and a density of 0.90 to 0.93 g / cm 3 ;

[0012] The metallocene low-density polyethylene has a melt index of 0.85 to 1.20 g / min and a density of 0.85 to 0.98 g / cm 3 ;

[0013] The high-density polyethylene has a melt index of 1.20 to 1.60 g / min and a density of 0.95 to 0.98 g / cm 3 ;

[0014] The polyamide nylon resin has a melt index of 18.0 to 25.0 g / min and a density of 1.10 to 1.15 g / cm 3 .

[0015] Furthermore, the low-density polyethylene is 2102TN26 from Qilu Petrochemical, LD450 from Yanshan Petrochemical, or 582E from Dow Chemical;

[0016] The metallocene low-density polyethylene is EPE 5815 of Dow Chemical, SP1520 of Mitsui Chemicals or 2010MA of Exxon;

[0017] The high-density polyethylene is 7600M from Yanshan Petrochemical, YGH041 from Shanghai Petrochemical, or DMDA-8008H from Dushanzi Petrochemical;

[0018] The polyamide nylon resin is PA66-101L from DuPont, 1700S from Asahi Kasei, or PA11-BZM30TL from Arkema.

[0019] Furthermore, the adhesive (special pressure-sensitive adhesive) comprises a component of one of polyacrylate emulsion, silicone resin emulsion and polyurethane resin emulsion pressure-sensitive adhesives.

[0020] Furthermore, the 180° peel strength of the polyacrylate emulsion pressure-sensitive adhesive on the 8K mirror panel is greater than 5.00 N / 25 mm (GB / T2792-2014: Test method for peel strength of adhesive tapes).

[0021] The second technical solution of the present invention is a method for preparing the above-mentioned high tear-resistant polyethylene polymer composite film, comprising the following steps:

[0022] The inner polyethylene film and the outer polyethylene film prepared by extrusion blow molding are bonded and compounded by using an adhesive to obtain the high-tear-resistant polyethylene polymer composite film.

[0023] The present invention starts from the screening and design of raw materials for polymer composite membranes, designs and prepares two layers of polyethylene films, namely an inner polyethylene film and an outer polyethylene film, and then screens a special pressure-sensitive adhesive to finally firmly composite the inner and outer polyethylene films together to obtain a highly tear-resistant polyethylene polymer composite membrane.

[0024] Furthermore, the inner polyethylene film and the outer polyethylene film are prepared separately in an extruder;

[0025] When preparing the inner layer polyethylene film, the extruder parameters include: zone 1 temperature of 170-180°C, zone 2 temperature of 175-185°C, zone 3 temperature of 180-190°C, zone 4 temperature of 180-185°C, and zone 5 temperature of 170-180°C;

[0026] When preparing the outer polyethylene film, the extruder parameters include: zone 1 temperature is 170-175°C, zone 2 temperature is 175-180°C, zone 3 temperature is 180-185°C, zone 4 temperature is 170-180°C, and zone 5 temperature is 170-180°C.

[0027] Furthermore, the preparation method of the inner layer polyethylene film includes: removing dust from the components of the inner layer polyethylene film and then mixing the ingredients, and the obtained inner layer material enters the inner layer extruder for melting and plasticization. The parameters of the extruder include: the temperature of zone one is 170-180°C, the temperature of zone two is 175-185°C, the temperature of zone three is 180-190°C, the temperature of zone four is 180-185°C, and the temperature of zone five is 170-180°C. The obtained molten glue is filtered and transported to the die head, extruded and blown to form a film bubble which is blown out from the die mouth. The film bubble is sequentially cooled, stabilized, measured in thickness, pulled, corona treated, defect detected, trimmed, destaticized and wound to obtain the inner layer polyethylene film.

[0028] Furthermore, the preparation method of the outer layer polyethylene film includes: removing dust from the components of the outer layer polyethylene film and then mixing the ingredients, and the obtained outer layer material enters the outer layer extruder for melting and plasticization. The parameters of the extruder are: the temperature of zone 1 is 170-175°C, the temperature of zone 2 is 175-180°C, the temperature of zone 3 is 180-185°C, the temperature of zone 4 is 170-180°C, and the temperature of zone 5 is 170-180°C. The obtained molten glue is filtered and transported to the die head, extruded and blown to form a film bubble which is blown out from the die mouth. The film bubble is sequentially cooled, stabilized, measured in thickness, pulled, corona treated, defect detected, trimmed, destaticized and wound to obtain the outer layer polyethylene film.

[0029] Furthermore, the step of laminating the inner polyethylene film and the outer polyethylene film prepared by extrusion blow molding with an adhesive is carried out on a printing and coating production line, specifically comprising: printing and coating the corona surface of the inner polyethylene film with an adhesive layer, drying the inner polyethylene film, and cold-pressing the film with the outer polyethylene film to obtain a highly tear-resistant polyethylene polymer composite film;

[0030] Among them, the corona surface of the inner polyethylene film can also be printed and coated with a series of trademarks, patterns, special logos and other coatings before printing and coating the adhesive coating, and then cold-pressed with the outer polyethylene film. This can greatly enrich the types and application range of high-tear-resistant polyethylene polymer composite films.

[0031] The third technical solution of the present invention: an application of the above-mentioned high tear-resistant polyethylene polymer composite film as a metal profile, a wooden profile, a carbon profile or a plastic profile.

[0032] A fourth technical solution of the present invention: A method for improving the tear resistance of a polyethylene polymer film, comprising the following steps: bonding and laminating an inner polyethylene film and an outer polyethylene film prepared by extrusion blow molding using an adhesive;

[0033] The inner polyethylene film comprises the following components, calculated in parts by weight: 50.0 to 85.0 parts of low-density polyethylene, 10.0 to 30.0 parts of metallocene low-density polyethylene, 5.0 to 15.0 parts of high-density polyethylene, and 1.0 to 10.0 parts of polyamide nylon resin;

[0034] The outer polyethylene film comprises the following components, calculated in parts by weight: 40.0 to 80.0 parts of low-density polyethylene, 15.0 to 40.0 parts of metallocene low-density polyethylene, 1.0 to 10.0 parts of high-density polyethylene, and 1.0 to 5.0 parts of polyamide nylon resin;

[0035] The adhesive comprises one of polyacrylate emulsion, silicone resin emulsion and polyurethane resin emulsion pressure-sensitive adhesives.

[0036] Furthermore, the inner polyethylene film comprises the following components, in parts by weight: 50.0 to 80.0 parts of low-density polyethylene, 10.0 to 20.0 parts of metallocene low-density polyethylene, 5.0 to 10.0 parts of high-density polyethylene, and 1.0 to 5.0 parts of polyamide nylon resin;

[0037] The outer polyethylene film comprises the following components in parts by weight: 40.0-70.0 parts of low-density polyethylene, 20.0-35.0 parts of metallocene low-density polyethylene, 1.0-5.0 parts of high-density polyethylene and 1.0-3.0 parts of polyamide nylon resin.

[0038] Furthermore, the weight percentages of the inner polyethylene film, the outer polyethylene film and the adhesive are 97%, 2.5% and 0.5% respectively, and the total is 100%.

[0039] Furthermore, the low-density polyethylene has a melt index of 1.10 to 1.45 g / min and a density of 0.90 to 0.93 g / cm 3 ;

[0040] The metallocene low-density polyethylene has a melt index of 0.85 to 1.20 g / min and a density of 0.85 to 0.98 g / cm 3 ;

[0041] The high-density polyethylene has a melt index of 1.20 to 1.60 g / min and a density of 0.95 to 0.98 g / cm 3 ;

[0042] The polyamide nylon resin has a melt index of 18.0 to 25.0 g / min and a density of 1.10 to 1.15 g / cm 3 .

[0043] Furthermore, the low-density polyethylene is 2102TN26 from Qilu Petrochemical, LD450 from Yanshan Petrochemical, or 582E from Dow Chemical;

[0044] The metallocene low-density polyethylene is EPE 5815 of Dow Chemical, SP1520 of Mitsui Chemicals or 2010MA of Exxon;

[0045] The high-density polyethylene is 7600M from Yanshan Petrochemical, YGH041 from Shanghai Petrochemical, or DMDA-8008H from Dushanzi Petrochemical;

[0046] The polyamide nylon resin is PA66-101L from DuPont, 1700S from Asahi Kasei, or PA11-BZM30TL from Arkema.

[0047] Furthermore, the 180° peel strength of the polyacrylate emulsion pressure-sensitive adhesive on the 8K mirror panel is greater than 5.00 N / 25 mm (GB / T2792-2014: Test method for peel strength of adhesive tapes).

[0048] Furthermore, the inner polyethylene film and the outer polyethylene film are prepared separately in an extruder;

[0049] When preparing the inner layer polyethylene film, the extruder parameters include: zone 1 temperature of 170-180°C, zone 2 temperature of 175-185°C, zone 3 temperature of 180-190°C, zone 4 temperature of 180-185°C, and zone 5 temperature of 170-180°C;

[0050] When preparing the outer polyethylene film, the extruder parameters include: zone 1 temperature is 170-175°C, zone 2 temperature is 175-180°C, zone 3 temperature is 180-185°C, zone 4 temperature is 170-180°C, and zone 5 temperature is 170-180°C.

[0051] Furthermore, the preparation method of the inner layer polyethylene film includes: removing dust from the components of the inner layer polyethylene film and then mixing the ingredients, and the obtained inner layer material enters the inner layer extruder for melting and plasticization. The parameters of the extruder include: the temperature of zone one is 170-180°C, the temperature of zone two is 175-185°C, the temperature of zone three is 180-190°C, the temperature of zone four is 180-185°C, and the temperature of zone five is 170-180°C. The obtained molten glue is filtered and transported to the die head, extruded and blown to form a film bubble which is blown out from the die mouth. The film bubble is sequentially cooled, stabilized, measured in thickness, pulled, corona treated, defect detected, trimmed, destaticized and wound to obtain the inner layer polyethylene film.

[0052] Furthermore, the preparation method of the outer layer polyethylene film includes: removing dust from the components of the outer layer polyethylene film and then mixing the ingredients, and the obtained outer layer material enters the outer layer extruder for melting and plasticization. The parameters of the extruder are: the temperature of zone 1 is 170-175°C, the temperature of zone 2 is 175-180°C, the temperature of zone 3 is 180-185°C, the temperature of zone 4 is 170-180°C, and the temperature of zone 5 is 170-180°C. The obtained molten glue is filtered and transported to the die head, extruded and blown to form a film bubble which is blown out from the die mouth. The film bubble is sequentially cooled, stabilized, measured in thickness, pulled, corona treated, defect detected, trimmed, destaticized and wound to obtain the outer layer polyethylene film.

[0053] Furthermore, the step of laminating the inner polyethylene film and the outer polyethylene film prepared by extrusion blow molding with an adhesive is carried out on a printing and coating production line, specifically comprising: printing and coating the corona surface of the inner polyethylene film with an adhesive layer, drying the inner polyethylene film, and cold-pressing the film with the outer polyethylene film to obtain a highly tear-resistant polyethylene polymer composite film;

[0054] Among them, the corona surface of the inner polyethylene film can also be printed and coated with a series of trademarks, patterns, special logos and other coatings before printing and coating the adhesive coating, and then cold-pressed with the outer polyethylene film. This can greatly enrich the types and application range of high-tear-resistant polyethylene polymer composite films.

[0055] The present invention discloses the following technical effects:

[0056] (1) The high-tear-resistant polyethylene polymer composite film of the present invention has a transparent appearance, low haze, and excellent mechanical properties, and can be widely used in the fields of metal profiles, wooden profiles, carbon profiles, and plastic profiles. At the same time, the high-tear-resistant polyethylene polymer composite film of the present invention still has high tear resistance after being soaked in water for 12 hours, and the composite strength is strong and the composite does not crack.

[0057] (2) The outer polyethylene film and the inner polyethylene film of the present invention are both blended with low-density polyethylene and metallocene low-density polyethylene, which improves the transparency of the film. At the same time, the introduction of high-density polyethylene further improves the mechanical properties of the inner and outer film layers.

[0058] The introduction of special polyamide nylon resin components not only further improves the mechanical strength and anti-curling properties of the inner and outer membranes, but also the amide groups contained in its structure increase the polarity of the inner and outer membrane layers, effectively increasing the composite strength of the inner and outer membranes bonded by the polyacrylate emulsion pressure-sensitive adhesive.

[0059] (3) The high tear resistance polyethylene polymer composite film of the present invention is obtained by coating a special pressure-sensitive adhesive to achieve tight bonding and compounding, and when bonding and compounding with the help of the special pressure-sensitive adhesive, trademarks, patterns, special logos and other coatings can be printed and coated at the same time. In this way, the outer film layer plays a good protective role for the printed and coated trademarks, patterns, special logos and other coatings, and thus has broad application prospects.

[0060] (4) In the high tear-resistant polyethylene polymer composite film of the present invention, small molecule additives such as plasticizers, nucleating agents and opening agents are not involved in the inner and outer film layers. Therefore, the high tear-resistant polyethylene polymer composite film of the present invention has the characteristics of low crystal point, high transparency, no precipitation and low haze, and can be widely used in the production of protective films. DETAILED DESCRIPTION

[0061] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0062] It should be understood that the terms described herein are intended only to describe particular embodiments and are not intended to limit the present invention. In addition, for numerical ranges herein, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Each smaller range between any intermediate value within a stated value or stated range and any other stated value or intermediate value within the stated range is also encompassed by the present invention. The upper and lower limits of these smaller ranges may be independently included or excluded within the scope.

[0063] Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein may also be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of any conflict with any incorporated document, the contents of this specification shall prevail.

[0064] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments described herein without departing from the scope or spirit of the invention. Other embodiments will be apparent to those skilled in the art from the description of the invention. The description and examples are intended to be exemplary only.

[0065] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0066] It should be pointed out that the matters not described in detail in the present invention are conventional operating means in this field and are not the focus of the present invention.

[0067] The “parts” described in the following examples are all “parts by weight”.

[0068] Example 1

[0069] A method for preparing a highly tear-resistant polyethylene polymer composite film:

[0070] High tear-resistant polyethylene polymer composite film, consisting of an inner polyethylene film, an outer polyethylene film and a special adhesive layer, wherein the weight percentage of the inner polyethylene film is 97%, the weight percentage of the outer polyethylene film is 2.5%, and the weight percentage of the special adhesive layer is 0.5%;

[0071] The inner polyethylene film is composed of low-density polyethylene (Qilu Petrochemical 2102TN26, melt index 1.20 g / min, density 0.91 g / cm 3 ) 75.0 parts, metallocene low density polyethylene (Dow EPE 5815, melt index of 1.05g / min, density of 0.92g / cm 3 ) 15.0 parts, high-density polyethylene (Yanshan Petrochemical 7600M, melt index of 1.35g / min, density of 0.96g / cm 3 ) 8.0 parts and polyamide nylon resin (DuPont PA66-101L, melt index is 22.0g / min, density is 1.12g / cm 3 ) 2.0 copies;

[0072] The outer polyethylene film is composed of low-density polyethylene (Qilu Petrochemical 2102TN26, melt index 1.20g / min, density 0.91g / cm 3 ) 65.0 parts, metallocene low-density polyethylene (Mitsui Chemicals SP1520, melt index 1.10 g / min, density 0.93 g / cm 3 ) 30.0 parts, high-density polyethylene (Yanshan Petrochemical 7600M, melt index of 1.35g / min, density of 0.96g / cm 3 ) 4.0 parts and polyamide nylon resin (DuPont PA66-101L, melt index of 22.0g / min, density of 1.12g / cm 3 ) 1.0 copy;

[0073] The component of the special adhesive layer is a polyacrylate emulsion pressure-sensitive adhesive.

[0074] Preparation method of high tear resistance polyethylene polymer composite film:

[0075] (1) Extrusion blow molding process of inner polyethylene film: Produced in a dust-free cleanroom, the extrusion blow molding equipment needs to be equipped with raw material dust removal, automatic batching, extruder, filtration, automatic air ring online thickness measurement, upper traction rotation, corona treatment, online defect detection, static electricity removal and center winding devices.

[0076] The specific preparation process is as follows: the components of the inner polyethylene film are dedusted by the dust removal device and then added to the automatic batching device according to the set ratio. Then, after mixing, they enter the extruder for melting and plasticization. The extruder parameters are: the temperature of zone 1 is 170-180℃, the temperature of zone 2 is 175-185℃, the temperature of zone 3 is 180-190℃, the temperature of zone 4 is 180-185℃, and the temperature of zone 5 is 170-180℃. The plasticized molten glue enters the filtering device to filter out impurities and unmelted glue particles, and the molten glue is transported to the die head, extruded and blown to form a film blank of the inner film layer, and then blown out through the die mouth. The cooling air cools the film quickly to improve its transparency. The cooled film passes through a bubble stabilizing rack to stabilize the film bubble. The online thickness gauge detects the thickness distribution of the film bubble. The film then enters the herringbone row to be clamped into a flat tubular film, and then enters the upper traction rotating device to flatten the film and then enter the guide rollers for further cooling. The cooled film enters the corona treatment device for corona treatment. The film after corona treatment enters the defect detection device to detect the appearance and fog point of the film. The film after inspection is trimmed by the auxiliary traction roller and separated into single sheets and enters the static elimination device. Finally, it is wound up by the winding device to obtain an inner layer polyethylene film with a thickness of 0.057mm.

[0077] (2) Extrusion blow molding process of outer polyethylene film: Produced in a dust-free cleanroom, the extrusion blow molding equipment needs to be equipped with raw material dust removal, automatic batching, extruder, filtration, automatic air ring online thickness measurement, upper traction rotation, corona treatment, online defect detection, static electricity removal and center winding devices.

[0078] The specific preparation process is as follows: the components of the outer polyethylene film are dedusted by the dust removal device and then added to the automatic batching device according to the set ratio. Then, after mixing, they enter the extruder for melting and plasticization. The extruder parameters are: the temperature of zone 1 is 170-175℃, the temperature of zone 2 is 175-180℃, the temperature of zone 3 is 180-185℃, the temperature of zone 4 is 170-180℃, and the temperature of zone 5 is 170-180℃. The plasticized molten glue enters the filtering device to filter out impurities and unmelted glue particles, and the molten glue is transported to the die head, extruded and blown to form a film blank of the inner film layer, and then blown out through the die mouth. The cooling air cools the film quickly to improve its transparency. The cooled film passes through a bubble stabilizing rack to stabilize the film bubble. The online thickness gauge detects the thickness distribution of the film bubble. The film then enters the herringbone row to be clamped into a flat tubular film, and then enters the upper traction rotating device to flatten the film and then enter the guide rollers for further cooling. The cooled film enters the corona treatment device for corona treatment. The film after corona treatment enters the defect detection device to detect the appearance and fog point of the film. The film after inspection is trimmed by the auxiliary traction roller and separated into single sheets and enters the static elimination device. Finally, it is wound up by the winding device to obtain an outer polyethylene film with a thickness of 0.023mm.

[0079] (3) Lamination process of inner polyethylene film and outer polyethylene film: The prepared inner polyethylene film is placed in a printing and coating production line, and a polyacrylate emulsion pressure-sensitive adhesive is coated on its corona surface. After drying in a drying oven, it is cold-pressed and laminated with the outer polyethylene film to obtain a highly tear-resistant polyethylene polymer composite film.

[0080] Example 2

[0081] The same as Example 1, except that the inner polyethylene film comprises, by weight, 65.0 parts of low-density polyethylene, 25.0 parts of metallocene low-density polyethylene, 7.5 parts of high-density polyethylene and 2.5 parts of polyamide nylon resin.

[0082] Example 3

[0083] The same as Example 1, except that the outer polyethylene film comprises, by weight, 75.0 parts of low-density polyethylene, 20.0 parts of metallocene low-density polyethylene, 3.5 parts of high-density polyethylene and 1.5 parts of polyamide nylon resin.

[0084] Example 4

[0085] Same as Example 1, except that the inner polyethylene film comprises, by weight, 75.0 parts of low-density polyethylene, 15.0 parts of metallocene low-density polyethylene, 7.5 parts of high-density polyethylene, and 2.5 parts of polyamide nylon resin;

[0086] The outer polyethylene film comprises, by weight, 65.0 parts of low-density polyethylene, 30.0 parts of metallocene low-density polyethylene, 3.5 parts of high-density polyethylene and 1.5 parts of polyamide nylon resin.

[0087] Example 5

[0088] Same as Example 1, except that the inner polyethylene film comprises, by weight, 70.0 parts of low-density polyethylene, 20.0 parts of metallocene low-density polyethylene, 7.5 parts of high-density polyethylene, and 2.5 parts of polyamide nylon resin;

[0089] The outer polyethylene film comprises, by weight, 70.0 parts of low-density polyethylene, 25.0 parts of metallocene low-density polyethylene, 3.5 parts of high-density polyethylene and 1.5 parts of polyamide nylon resin.

[0090] Example 6

[0091] Same as Example 1, except that the inner polyethylene film comprises, by weight, 70.0 parts of low-density polyethylene, 15.0 parts of metallocene low-density polyethylene, 7.0 parts of high-density polyethylene, and 3.0 parts of polyamide nylon resin;

[0092] The outer polyethylene film comprises the following components, in parts by weight: 68.0 parts of low-density polyethylene, 25.0 parts of metallocene low-density polyethylene, 5.0 parts of high-density polyethylene, and 2.0 parts of polyamide nylon resin.

[0093] Comparative Example 1

[0094] Same as Example 1, except that the inner polyethylene film comprises, by weight, 90.0 parts of low-density polyethylene, 8.0 parts of high-density polyethylene, and 2.0 parts of polyamide nylon resin;

[0095] The outer polyethylene film comprises, by weight, 95.0 parts of low-density polyethylene, 4.0 parts of high-density polyethylene and 1.0 part of polyamide nylon resin.

[0096] Comparative Example 2

[0097] Same as Example 1, except that the inner polyethylene film comprises, by weight, 75.0 parts of low-density polyethylene, 17.0 parts of metallocene low-density polyethylene, and 8.0 parts of high-density polyethylene;

[0098] The outer polyethylene film comprises, by weight, 75.0 parts of low-density polyethylene, 21.0 parts of metallocene low-density polyethylene, and 4.0 parts of high-density polyethylene;

[0099] Comparative Example 3

[0100] The same as Example 1, except that the outer polyethylene film comprises, by weight, 75.0 parts of low-density polyethylene, 20.0 parts of metallocene low-density polyethylene, 4.0 parts of high-density polyethylene and 1.0 part of polyamide nylon resin.

[0101] No special adhesive layer is provided, and step (3) specifically comprises: placing the prepared inner polyethylene film in a printing and coating production line, drying it in a drying oven, and cold-pressing and laminating it with the outer polyethylene film to obtain a highly tear-resistant polyethylene polymer composite film.

[0102] Comparative Example 4

[0103] The same as Example 1, except that the outer polyethylene film comprises, by weight, 75.0 parts of low-density polyethylene, 20.0 parts of metallocene low-density polyethylene, 4.0 parts of high-density polyethylene and 1.0 part of polyamide nylon resin.

[0104] The component of the special adhesive layer is polyurethane adhesive (F0416, Shenzhen Jitian Chemical Co., Ltd.).

[0105] Effect Example 1

[0106] Performance Testing

[0107] The performance test indicators of the high tear resistance polyethylene polymer composite film prepared by the present invention mainly include appearance, haze, thickness, tensile strength, elongation at break and composite performance.

[0108] Specific test parameters refer to the requirements of relevant national standards such as GB / T1040.3-2006 "Determination of Tensile Properties of Plastics - Part 3: Film and Sheeting - Test Conditions," GB / T 6672-2001 "Plastic Film and Sheeting - Mechanical Measurement Method: Film Thickness Gauge," and GB / T30775-2014 "Polyethylene (PE) Protective Film Pressure-Sensitive Tape." Specific mechanical property test results are shown in Table 1.

[0109] The present invention also evaluated the composite film's effectiveness by referring to a commonly used method for evaluating composite films in the protective film industry. Specifically, the prepared polyethylene polymer composite film was torn with both hands, and the ability to tear the polyethylene composite film was used as the criterion. Polyethylene composite films that could not be torn were considered optimal. The composite film was then immersed in water, and the degree of tearing and cracking was measured at different times.

[0110] Table 1 Properties of high tear resistance polyethylene polymer composite film

[0111]

[0112] As shown in Table 1, the high-tear-resistant polyethylene polymer composite films prepared in accordance with the present invention exhibit a transparent appearance, low haze, and excellent mechanical properties. Furthermore, the high-tear-resistant polyethylene polymer composite films prepared in accordance with the present invention maintain high tear resistance, strong composite strength, and no cracking even after being soaked in water for 12 hours, thus providing broad application prospects.

[0113] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A high tear resistance polyethylene polymer composite film, characterized in that: It comprises an inner polyethylene film and an outer polyethylene film; the inner polyethylene film and the outer polyethylene film are bonded together by an adhesive; The inner polyethylene film comprises the following components, calculated in parts by weight: 50.0 to 85.0 parts of low-density polyethylene, 10.0 to 30.0 parts of metallocene low-density polyethylene, 5.0 to 15.0 parts of high-density polyethylene, and 1.0 to 10.0 parts of polyamide nylon resin; The outer polyethylene film comprises the following components in parts by weight: 40.0-80.0 parts of low-density polyethylene, 15.0-40.0 parts of metallocene low-density polyethylene, 1.0-10.0 parts of high-density polyethylene and 1.0-5.0 parts of polyamide nylon resin.

2. The high tear-resistant polyethylene polymer composite film according to claim 1, characterized in that The inner polyethylene film comprises the following components, calculated in parts by weight: 50.0 to 80.0 parts of low-density polyethylene, 10.0 to 20.0 parts of metallocene low-density polyethylene, 5.0 to 10.0 parts of high-density polyethylene, and 1.0 to 5.0 parts of polyamide nylon resin; And / or, the outer polyethylene film comprises the following components, in parts by weight: 40.0-70.0 parts of low-density polyethylene, 20.0-35.0 parts of metallocene low-density polyethylene, 1.0-5.0 parts of high-density polyethylene and 1.0-3.0 parts of polyamide nylon resin.

3. The high tear-resistant polyethylene polymer composite film according to claim 1, characterized in that The weight percentages of the inner polyethylene film, the outer polyethylene film and the adhesive are 97%, 2.5% and 0.5% respectively.

4. The high tear resistance polyethylene polymer composite film according to claim 1, characterized in that The low-density polyethylene has a melt index of 1.10 to 1.45 g / min and a density of 0.90 to 0.93 g / cm 3 ; And / or, the metallocene low-density polyethylene has a melt index of 0.85 to 1.20 g / min and a density of 0.85 to 0.98 g / cm 3 ; And / or, the high-density polyethylene has a melt index of 1.20 to 1.60 g / min and a density of 0.95 to 0.98 g / cm 3 ; And / or, the polyamide nylon resin has a melt index of 18.0 to 25.0 g / min and a density of 1.10 to 1.15 g / cm 3 .

5. The high tear resistance polyethylene polymer composite film according to claim 1, characterized in that: The adhesive comprises one of polyacrylate emulsion, silicone resin emulsion and polyurethane resin emulsion pressure-sensitive adhesives.

6. A method for preparing a high tear resistance polyethylene polymer composite film according to any one of claims 1 to 5, characterized in that: The following steps are involved: The inner polyethylene film and the outer polyethylene film prepared by extrusion blow molding are bonded and compounded by using an adhesive to obtain the high-tear-resistant polyethylene polymer composite film.

7. Use of the high tear resistance polyethylene polymer composite film according to any one of claims 1 to 5 as a metal profile, a wood profile, a carbon profile or a plastic profile.

8. A method for improving the tear resistance of polyethylene polymer film, characterized in that: The following steps are involved: The inner polyethylene film and the outer polyethylene film prepared by extrusion blow molding are bonded and laminated by using adhesive; The inner polyethylene film comprises the following components, calculated in parts by weight: 50.0 to 85.0 parts of low-density polyethylene, 10.0 to 30.0 parts of metallocene low-density polyethylene, 5.0 to 15.0 parts of high-density polyethylene, and 1.0 to 10.0 parts of polyamide nylon resin; The outer polyethylene film comprises the following components, calculated in parts by weight: 40.0 to 80.0 parts of low-density polyethylene, 15.0 to 40.0 parts of metallocene low-density polyethylene, 1.0 to 10.0 parts of high-density polyethylene, and 1.0 to 5.0 parts of polyamide nylon resin; The adhesive comprises one of polyacrylate emulsion, silicone resin emulsion and polyurethane resin emulsion pressure-sensitive adhesives.

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