1. A multilayer co-extrusion film process for a fluorine-containing resin high-performance helium barrier film is characterized by comprising the following steps:

(1) metering: the raw and auxiliary materials such as nylon, polyethylene resin and the like are manually poured into a hopper, and are automatically metered and weighed according to a specific proportion.

(2) Screw extrusion plasticizing: and (3) heating the metered resin particles by a screw extruder of the multilayer film extrusion equipment, shearing and plasticizing the resin particles into fluid to enable the fluid to reach a molten state, wherein the temperature is 240-300 ℃.

(3) Shaping: the melted resin is longitudinally stretched under the action of mechanical force of extrusion blow molding in an extruder, and is transversely stretched by compressed air blowing at the same time or later, so that the multilayer composite film is blown into a film, and the film is co-extruded by a plurality of extruders in the multilayer film extruder and is extruded at one head; and cooling, mechanically and automatically drawing, stretching, shaping and rolling the multilayer film in the cooling line by a fan arranged on the extruder and a cooling ring arranged on the head to prepare the multilayer film.

(4) Splitting, flattening and rolling: the film after shaping is rolled by a multi-roller shaft of the multilayer film extruder, the shaped film is trimmed by edge trimming equipment of the multilayer film extruder, and the trimmed film is flattened and rolled by a flattening machine.

(5) And (4) checking: cutting samples with the length of about 5m before and after rolling the multilayer composite film, and inspecting; taking a film on a sample, and testing the temperature resistance condition of the film through a high-temperature and low-temperature environment box; performing mechanical test detection on the film by an electronic tensile testing machine according to standard sample preparation; taking a film on a sample, and testing the gas permeability of the film by a gas permeameter; taking a film on a sample to carry out an ultraviolet aging test, testing the mechanical property of the aged film by an electronic tensile testing machine, and testing the gas permeability of the aged film by a gas permeameter; taking a film on a sample, and testing the film by using a film laminating machine for experiments to test the adhesive property of the film; a film is taken from a sample, and is subjected to heat sealing through a film heat sealing tester, and the heat sealing performance of the film is tested.

(6) Packaging and warehousing: sticking the multilayer composite film which meets the relevant requirements and does not meet the relevant requirements after inspection to a sample, packaging the film which meets the relevant requirements, and entering a finished product raw material area; the film which does not meet the relevant requirements is labeled and is placed in a finished product raw material area for independent storage, waste packaging materials can be generated in the raw material unpacking and packing processes, and the packaging wastes are subjected to centralized and harmless treatment.

2. The multilayer co-extrusion film process of the fluorine-containing resin high-performance helium barrier film as claimed in claim 1, wherein: the raw and auxiliary materials entering the hopper of the project comprise: nylon, polyethylene, acid modified polyolefin composition and ethylene tetrafluoroethylene polymer are all granular, and no dust particles are generated.

3. The multilayer co-extrusion film process of the fluorine-containing resin high-performance helium barrier film as claimed in claim 1, wherein: and (3) preparing the fluorine resin-containing high-performance helium barrier composite film by using the fluororesin and the barrier material through multilayer co-extrusion equipment.

Background

The existing fluororesin multilayer coextrusion film process is not seen yet; the multilayer co-extrusion film production process can prepare the fluororesin and other resins into the multilayer composite film through the multilayer co-extrusion process.

The prior art is mainly based on conventional structures, such as: multilayer composite films of LLDPE; the helium or hydrogen barrier film prepared from special PET and other materials is mainly applied to key parts such as high-altitude balloons, helium barrier layers of near space aerostats and the like.

However, in practical use, there still exist some disadvantages, such as: the film material has poor mechanical property, low tensile strength and low heat-sealing strength, and the gas barrier property at the close heat-sealing joint is reduced.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a multilayer co-extrusion film process for a fluorine-containing resin high-performance helium barrier film, which solves the problems of poor mechanical property, low tensile strength, low heat-sealing strength and reduced gas barrier property at a close heat-sealing interface of the existing material.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: a multilayer co-extrusion film process of a fluorine-containing resin high-performance helium barrier film comprises the following steps:

(1) metering: the raw and auxiliary materials such as nylon, polyethylene resin and the like are manually poured into a hopper, and are automatically metered and weighed according to a specific proportion.

(2) Screw extrusion plasticizing: and (3) heating the metered resin particles by a screw extruder of the multilayer film extrusion equipment, shearing and plasticizing the resin particles into fluid to enable the fluid to reach a molten state, wherein the temperature is 240-300 ℃.

(3) Shaping: the melted resin is longitudinally stretched under the action of mechanical force of extrusion blow molding in an extruder, and is transversely stretched by compressed air blowing at the same time or later, so that the multilayer composite film is blown into a film, and the film is co-extruded by a plurality of extruders in the multilayer film extruder and is extruded at one head; and cooling, mechanically and automatically drawing, stretching, shaping and rolling the multilayer film in the cooling line by a fan arranged on the extruder and a cooling ring arranged on the head to prepare the multilayer film.

(4) Splitting, flattening and rolling: the film after shaping is rolled by a multi-roller shaft of the multilayer film extruder, the shaped film is trimmed by edge trimming equipment of the multilayer film extruder, and the trimmed film is flattened and rolled by a flattening machine.

(5) And (4) checking: cutting samples with the length of about 5m before and after rolling the multilayer composite film, and inspecting; taking a film on a sample, and testing the temperature resistance condition of the film through a high-temperature and low-temperature environment box; performing mechanical test detection on the film by an electronic tensile testing machine according to standard sample preparation; taking a film on a sample, and testing the gas permeability of the film by a gas permeameter; taking a film on a sample to carry out an ultraviolet aging test, testing the mechanical property of the aged film by an electronic tensile testing machine, and testing the gas permeability of the aged film by a gas permeameter; taking a film on a sample, and testing the film by using a film laminating machine for experiments to test the adhesive property of the film; a film is taken from a sample, and is subjected to heat sealing through a film heat sealing tester to test the heat sealing performance of the film, (the cut film is folded in half, the folded double-layer film is directly subjected to heat sealing, the pressure of the equipment is not lower than 0.1MPa, the time is not lower than 1s during the heat sealing, and no waste is generated in the process).

(6) Packaging and warehousing: sticking the multilayer composite film which meets the relevant requirements and does not meet the relevant requirements after inspection to a sample, packaging the film which meets the relevant requirements, and entering a finished product raw material area; the film which does not meet the relevant requirements is labeled and is placed in a finished product raw material area for independent storage, waste packaging materials can be generated in the raw material unpacking and packing processes, and the packaging wastes are subjected to centralized and harmless treatment.

Preferably, the raw and auxiliary materials entering the hopper of the project comprise: nylon, polyethylene, acid modified polyolefin composition and ethylene tetrafluoroethylene polymer are all granular, and no dust particles are generated.

Preferably, the fluorine resin and the barrier material are subjected to multilayer co-extrusion equipment to prepare the fluorine resin-containing high-performance helium barrier composite film.

(III) advantageous effects

The invention provides a multilayer co-extrusion film process for a fluorine-containing resin high-performance helium barrier film, which has the following beneficial effects:

preparing a multi-layer co-extrusion film containing fluorine resin by adopting a multi-layer co-extrusion process for fluororesin and barrier layer resin, and enabling the molecular structures in the multi-layer composite film to be orderly arranged in the transverse direction and the longitudinal direction; the transverse and longitudinal mechanical properties (tensile strength, tensile modulus, breaking strength and breaking elongation) of the composite film are further improved; further improving the gas barrier property of the composite film.

Detailed Description

All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

The invention provides a technical scheme that: a multilayer co-extrusion film process of a fluorine-containing resin high-performance helium barrier film comprises the following steps:

(1) metering: the raw and auxiliary materials such as nylon, polyethylene resin and the like are manually poured into a hopper, and are automatically metered and weighed according to a specific proportion.

(2) Screw extrusion plasticizing: and (3) heating the metered resin particles by a screw extruder of the multilayer film extrusion equipment, shearing and plasticizing the resin particles into fluid to enable the fluid to reach a molten state, wherein the temperature is 240-300 ℃.

(3) Shaping: the melted resin is longitudinally stretched under the action of mechanical force of extrusion blow molding in an extruder, and is transversely stretched by compressed air blowing at the same time or later, so that the multilayer composite film is blown into a film, and the film is co-extruded by a plurality of extruders in the multilayer film extruder and is extruded at one head; and cooling, mechanically and automatically drawing, stretching, shaping and rolling the multilayer film in the cooling line by a fan arranged on the extruder and a cooling ring arranged on the head to prepare the multilayer film.

(4) Splitting, flattening and rolling: the film after shaping is rolled by a multi-roller shaft of the multilayer film extruder, the shaped film is trimmed by edge trimming equipment of the multilayer film extruder, and the trimmed film is flattened and rolled by a flattening machine.

(5) And (4) checking: cutting samples with the length of about 5m before and after rolling the multilayer composite film, and inspecting; taking a film on a sample, and testing the temperature resistance condition of the film through a high-temperature and low-temperature environment box; performing mechanical test detection on the film by an electronic tensile testing machine according to standard sample preparation; taking a film on a sample, and testing the gas permeability of the film by a gas permeameter; taking a film on a sample to carry out an ultraviolet aging test, testing the mechanical property of the aged film by an electronic tensile testing machine, and testing the gas permeability of the aged film by a gas permeameter; taking a film on a sample, and testing the film by using a film laminating machine for experiments to test the adhesive property of the film; a film is taken from a sample, and is subjected to heat sealing through a film heat sealing tester to test the heat sealing performance of the film, (the cut film is folded in half, the folded double-layer film is directly subjected to heat sealing, the pressure of the equipment is not lower than 0.1MPa, the time is not lower than 1s during the heat sealing, and no waste is generated in the process).

(6) Packaging and warehousing: sticking the multilayer composite film which meets the relevant requirements and does not meet the relevant requirements after inspection to a sample, packaging the film which meets the relevant requirements, and entering a finished product raw material area; the film which does not meet the relevant requirements is labeled and is placed in a finished product raw material area for independent storage, waste packaging materials can be generated in the raw material unpacking and packing processes, and the packaging wastes are subjected to centralized and harmless treatment.

Wherein, this project gets into the raw and auxiliary materials of hopper includes: nylon, polyethylene, acid modified polyolefin composition, ethylene tetrafluoroethylene polymer, every material is granular, will not produce the dust particulate matter, will produce and extrude the waste gas (TRVOC, non-methane total hydrocarbon, ammonia) in the course of raw materials melting, will have the foul smell substance to produce at the same time, discharge by 1 one 20m high exhaust stack P1 after collecting through a set of "UV photooxidation + activated carbon adsorption equipment" purification treatment after the gas collecting channel above the extruder of the multilayer film, wherein the motor cooling of the extruder of the multilayer film uses the indirect cooling of fresh water, supplement regularly, not discharge, seal and preserve the whole roll of film after meeting the relevant requirements through the above-mentioned performance detection; and after the film is inspected, the film which does not meet the relevant requirements is divided, stored and marked according to different requirements, and a sample is respectively retained for subsequent research after the film which does not meet the requirements is inspected.

Example 2

The difference from the embodiment 1 is that: in the shaping step, the film of the double-layer structure is shaped and blown out by an extruder.

Comparative example

Taking 90 parts of raw materials, respectively preparing the raw materials according to examples 1 and 2 and the prior art, measuring the tensile strength, the gas barrier property and the heat seal strength of each raw material after the preparation is finished, randomly sampling the samples of example 1 and then placing the samples in a container I, randomly sampling the samples of example 2 and then placing the samples in a container 2, randomly sampling the samples in the prior art and then placing the samples in a container 3, and specifically referring to the following table:

in summary, the best performance can be achieved by extruding the film using a multilayer compounding process.

This fluorine resin's high performance helium separation film multilayer coextrusion film technology, through the resin after will melting, the mechanical force effect through the inside extrusion blow molding of extruder carries out longitudinal stretching, simultaneously or later carry out horizontal stretching through compressed air inflation, make multilayer composite film inflation film-forming, crowd from taking a plurality of extruders altogether through multilayer film extruder, extrude at a aircraft nose, cool off the multilayer film that is in the cooling line, mechanical automatic traction, tensile, design, make multilayer film after the rolling, it is relatively poor to have solved current membrane material mechanical properties, low tensile strength, heat seal strength is low, near and the problem that the gas barrier property descends at heat seal kneck.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.