Preparation process of anti-slip PE composite film and composite film

Abstract

The application provides an anti-slip PE composite film preparation process and a composite film. The PE composite film comprises five layers. The preparation process of the composite film can avoid slipping without reducing the peeling strength, and solves the technical problem of low friction coefficient of a composite surface.

Description

Technical Field

[0001] This invention relates to the field of composite membrane technology, specifically to a process for preparing an anti-slip PE composite membrane and the composite membrane itself. Background Technology

[0002] When PET is used as the surface layer in a PE composite, its resin has high polarity, allowing it to achieve a surface tension of 42 dynes without corona treatment. This makes it highly susceptible to adsorbing slip agents from the PE formulation. Slip agents are essential in the PE formulation to ensure opening properties. When slip agents from the PE surface of the PET / PE composite film are adsorbed onto the PET layer, it causes the PET surface to become slippery, a persistent industry challenge. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a process for preparing an anti-slip PE composite film and a composite film that can prevent slippage and effectively solve the technical problem of low surface friction coefficient of PET / PE.

[0004] The objective of this invention is achieved through the following technical solution:

[0005] The present invention provides a process for preparing an anti-slip PE composite film, comprising the following steps:

[0006] S1. Prepare the raw materials required for five layers of PE film; the five layers of PE film are a corona layer, a first core layer, a second core layer, a third core layer, and a heat-sealing layer; each layer of the PE film contains a slip agent; the slip agent content of the third core layer and the heat-sealing layer is higher than that of the second core layer; the heat-sealing layer and the third core layer are both made of linear low-density polyethylene;

[0007] S2. Use a co-extrusion blown film machine to process five-layer PE film;

[0008] S3. The co-extruded melt is blown and tractioned, and cooled by a fan ring to become a film bubble;

[0009] S4. Perform corona treatment on the membrane bubble to obtain a thin film;

[0010] S5. Cut the film into the required specifications and then roll it up.

[0011] Optionally or preferably, the raw material of the corona layer includes 75%-90% linear low-density polyethylene 7042N and 10%-25% high-density polyethylene 2426H; the raw material of the first core layer includes 75%-90% linear low-density polyethylene 7042N and 10%-25% high-density polyethylene 2426H; the raw material of the second core layer includes 75%-90% linear low-density polyethylene 7042N and 10%-25% high-density polyethylene 2426H. The raw materials for the third core layer include 25%-45% linear low-density polyethylene 7042N, 30%-50% SECCO 0220KJ, and 10%-25% high-density polyethylene 2426H; the raw materials for the heat-sealing layer include 50%-60% linear low-density polyethylene SECCO 0220KJ, 15%-25% high-density polyethylene 2426H, and 10%-25% Mitsui SP1520.

[0012] Optionally or preferably, the slip agent content of the corona layer is 50-125 PPM; the slip agent content of the first core layer is 50-125 PPM; the slip agent content of the second core layer is 50-125 PPM; the slip agent content of the third core layer is 485-725 PPM; and the slip agent content of the heat-sealing layer is 725-845 PPM.

[0013] Optionally or preferably, when processing a five-layer PE film using a co-extrusion blown film machine in step S2, the screw temperature for processing the corona layer is 160-165℃; the screw temperature for processing the first core layer is 170-175℃; the screw temperature for processing the second core layer is 170-175℃; the screw temperature for processing the third core layer is 165-170℃; and the screw temperature for processing the heat-sealing layer is 170-175℃.

[0014] Optionally or preferably, in step S3, the blow-up ratio of the melt is 2.5-3.0; the traction ratio is 4.0-6.0; and in step S4, the corona treatment value is 42-44 dynes.

[0015] The present invention also provides a composite film comprising a corona layer, a first core layer, a second core layer, a third core layer, and a heat-sealing layer; wherein the thickness of the corona layer is 15-20%; the thickness of the first core layer is 15-20%; the thickness of the second core layer is 25-30%; the thickness of the third core layer is 15-20%; and the thickness of the heat-sealing layer is 20-25%.

[0016] Both the heat-sealing layer and the third core layer use SECCO 0220KJ;

[0017] The slip agent content of the third core layer and the heat-sealing layer is higher than that of the second core layer;

[0018] The PE composite film is prepared by the method described in any one of claims 1-6.

[0019] Based on the above technical solution, the following technical effects can be achieved:

[0020] The present invention provides an anti-slip PE composite film and its preparation process, which can ensure the openness of the composite film and control the coefficient of friction of the contact surface to above 0.25, so that the composite film has an anti-slip effect. Detailed Implementation

[0021] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The described embodiments are only a part of the embodiments of the invention, not all of them. Based on the embodiments of the invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the invention.

[0022] Example 1:

[0023] This embodiment provides a process for preparing an anti-slip PE composite film, which includes the following steps:

[0024] S1. Prepare the raw materials required for the five-layer PE film respectively; the five-layer PE film consists of a corona layer, a first core layer, a second core layer, a third core layer, and a heat-sealing layer; each layer of the PE film contains a slip agent; the heat-sealing layer and the third core layer both use 0220KJ.

[0025] Furthermore,

[0026] The raw materials for the corona layer include 90 parts of 7042N and 10 parts of 2426H;

[0027] The raw materials for the first core layer include 80 parts of 7042N and 20 parts of 2426H;

[0028] The raw materials for the second core layer include 75 parts of 7042N and 25 parts of 2426H;

[0029] The raw materials for the third core layer include 45 parts of 7042N, 30 parts of 022, and 15 parts of Mitsui SF1520.

[0030] Furthermore, the thickness ratio of the corona layer, the first core layer, the second core layer, the third core layer, and the heat-sealing layer is 17:16:28:17:22.

[0031] Furthermore, the corona layer, first core layer, second core layer, third core layer, and heat-sealing layer contain slip agents of 50 PPM, 100 PPM, 125 PPM, 485 PPM, and 845 PPM, respectively. When this composite film is laminated with other films, such as PET / PE or BOPA / PE composite films, due to the use of 0220 KJ, the slip agent does not easily migrate, and less is adsorbed on the PET surface material. The third core layer contains a higher concentration of slip agent, which slowly migrates to the heat-sealing layer, thus giving the PE film good slip properties.

[0032] S2. Use a co-extrusion blown film machine to process five-layer PE film;

[0033] Furthermore,

[0034] The screw temperature for processing the corona layer is 160℃; the screw temperature for processing the first core layer is 170℃; the screw temperature for processing the second core layer is 170℃; the screw temperature for processing the third core layer is 165℃; and the screw temperature for processing the heat-sealing layer is 170℃.

[0035] S3. The co-extruded melt is blown and tractioned, and cooled by a fan ring to become a film bubble;

[0036] Furthermore, the inflation ratio is 2.5-3.0; the traction ratio is 4.0-6.0.

[0037] S4. Perform corona treatment on the membrane bubble to obtain a thin film;

[0038] S5. Cut the film into the required specifications and then roll it up.

[0039] When laminating this anti-slip PE composite film with PET, Huntsman 3292 / 40070 solvent-free adhesive is used, with a mixing ratio of 3292:40070 = 100:70, and an adhesive application rate of 1.3-1.5 g / m³. 2 The temperatures of the glue cylinders and glue delivery pipes for 3292 and 40070 are both 40℃, the temperatures of the metering roller and coating roller are 40℃, the temperature of the heat sealing roller is 30-35℃, and the laminating machine speed is controlled at 150-260m / min; the PET surface layer feeding tension is 0.07MPa, the channel tension is 0.2MPa, the PE feeding tension is 0.04MPa, the receiving tension is 10kgf, and the peel strength after curing is measured to be 3.6N, and the PET surface friction coefficient is 0.25-0.32.

[0040] Example 2:

[0041] The difference from Example 1 is as follows:

[0042] The corona layer, the first core layer, and the second core layer contain 50 PPM, 100 PPM, and 125 PPM of slip agent, respectively.

[0043] The raw materials for the third core layer include 75 parts of 7042N and 25 parts of 2426H, the raw materials for the heat-sealing layer include 75 parts of 7042 and 25 parts of 2426H, and 0.8 kg of Huayi 7203 slip agent. The slip agent content of the third core layer and the heat-sealing layer is 125 PPM and 1178 PPM, respectively.

[0044] When compounded using the same process as in Example 1, the peel strength was measured to be 3.55 N and the coefficient of friction was 0.15-0.21.

[0045] It can be demonstrated that Example 1 effectively solves the problem of low PET surface friction coefficient in PET / PE without affecting peel strength.

[0046] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A process for preparing an anti-slip PE composite film, characterized in that: Includes the following steps: S1. Prepare the raw materials required for five layers of PE film; the five layers of PE film are a corona layer, a first core layer, a second core layer, a third core layer, and a heat-sealing layer; each layer of the PE film contains a slip agent; the slip agent content of the third core layer and the heat-sealing layer is higher than that of the second core layer; the heat-sealing layer and the third core layer are both made of linear low-density polyethylene; S2. Use a co-extrusion blown film machine to process five-layer PE film; S3. The co-extruded melt is blown and tractioned, and cooled by a fan ring to become a film bubble; S4. Perform corona treatment on the membrane bubble to obtain a thin film; S5. Cut the film into the required specifications and wind it up; The corona layer has a slip agent content of 50-125 PPM; the first core layer has a slip agent content of 50-125 PPM; the second core layer has a slip agent content of 50-125 PPM; the third core layer has a slip agent content of 485-725 PPM; and the heat-sealing layer has a slip agent content of 725-845 PPM. The raw materials of the corona layer include 75%-90% linear low-density polyethylene 7042N and 10%-25% high-pressure low-density polyethylene 2426H. The raw materials of the first core layer include 75%-90% linear low-density polyethylene 7042N and 10%-25% high-pressure low-density polyethylene 2426H; The raw materials for the second core layer include 75%-90% linear low-density polyethylene 7042N and 10%-25% high-pressure low-density polyethylene 2426H; The raw materials of the third core layer include 25%-45% linear low-density polyethylene 7042N, 30%-50% SECCO 0220KJ and 10%-25% high-pressure low-density polyethylene 2426H. The raw materials for the heat-sealing layer include 50%-60% linear low-density polyethylene K0220KJ, 15%-25% high-pressure low-density polyethylene 2426H, and 10%-25% Mitsui SP1520.

2. The process for preparing an anti-slip PE composite film according to claim 1, characterized in that: When processing a five-layer PE film using a co-extrusion blown film machine in step S2, the screw temperature for processing the corona layer is 160-165℃; the screw temperature for processing the first core layer is 170-175℃; the screw temperature for processing the second core layer is 170-175℃; the screw temperature for processing the third core layer is 165-170℃; and the screw temperature for processing the heat-sealing layer is 170-175℃.

3. The process for preparing an anti-slip PE composite film according to claim 1, characterized in that: In step S3, the blow-up ratio of the melt is 2.5-3.0; the traction ratio is 4.0-6.

0.

4. The process for preparing an anti-slip PE composite film according to claim 1, characterized in that: In step S4, the corona treatment value is 42-44 dynes.

5. An anti-slip PE composite film, characterized in that: It includes a corona layer, a first core layer, a second core layer, a third core layer, and a heat-sealing layer; the thickness of the corona layer is 15-20%; the thickness of the first core layer is 15-20%; the thickness of the second core layer is 25-30%; the thickness of the third core layer is 15-20%; the thickness of the heat-sealing layer is 20-25%; both the heat-sealing layer and the third core layer use SECCO 0220KJ. The slip agent content of the third core layer and the heat-sealing layer is higher than that of the second core layer; The PE composite film is prepared using the process described in any one of claims 1-4.