1. A multilayer composite film coextrusion film process of fluorine-containing resin for an ultra-high altitude balloon is characterized by comprising the following steps:

s1, metering: adding granular nylon, polyethylene resin and other raw and auxiliary materials into a hopper of an extruder by manpower, and automatically metering, weighing and mixing according to a specific proportion.

S2, feeding and extruding: and when the extruder and the machine head meet the heat preservation requirement (namely the temperature is 220-310 ℃), starting the extruder, adding a small amount of raw and auxiliary materials into the hopper, rotating the screw at a low speed at the beginning, gradually increasing the rotating speed of the screw after the molten material passes through the machine head and is blown into a tube bubble, filling the material, and combining the fluororesin with other resins by using a customized multilayer extrusion device to prepare the multilayer co-extruded film.

S3, material lifting: the molten materials passing through the head are brought together and lifted up while a small amount of air is introduced to prevent them from sticking to each other.

S4, 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 so that the multilayer composite film is blown into a film, and then the film is co-extruded by a plurality of extruders carried by the multilayer film extruder and is extruded by the same machine head; and cooling, mechanically and automatically drawing, stretching, shaping and rolling the multilayer film in the cooling line by matching a fan arranged on the extruder with a cooling ring arranged on the machine head to prepare the multilayer film.

S5, cutting, 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.

S6, checking: and cutting a plurality of samples with the length of about 5m before and after rolling the multilayer composite film, and inspecting.

S7, waste treatment: the method is characterized in that the method is used for concentrating wastes and leftover materials produced in the production and processing of the multilayer co-extruded film and simultaneously performing harmless operation after the wastes and the leftover materials are subjected to centralized treatment.

S8, 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; and sticking labels on the films which do not meet the relevant requirements, and putting the films into a finished product raw material area for independent storage.

2. The multilayer co-extrusion film process of the fluorine-containing resin high-performance helium barrier film as claimed in claim 1, wherein: in the S2 process, the motor of the multilayer film extruder is cooled indirectly by using fresh water, and the fresh water is periodically supplemented without being discharged.

3. The multilayer co-extrusion film process of the fluorine-containing resin high-performance helium barrier film as claimed in claim 1, wherein: in S6, the temperature resistance, gas permeability, mechanical properties of the film, tensile properties, ultraviolet ray aging resistance, and adhesion and heat sealing properties were respectively examined.

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

Background

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 a high-altitude balloon, a helium barrier layer of an adjacent space aerostat and the like, and has a conventional structure: LLDPE/AD/EVOH/AD/LLDPE or special PET monolayer; other films containing EVOH obstruct helium or hydrogen, and the principle is as follows: the principle of helium gas blocking by the multilayer or single-layer film is that gas molecules are blocked by a tortuous channel with a fine structure in the film.

However, in practical use, there still exist some disadvantages: 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; the existing structural material of the film has poor high and low temperature aging resistance, and LLDPE has high and low temperature resistance range of about-65-110 ℃; after high and low temperature circulation, the material is aged, the mechanical property is reduced or the material property is invalid; gas barrier performance degradation or failure; the film has poor ultraviolet aging resistance, and the mechanical property, heat sealing property and gas barrier property of the material are reduced or failed after ultraviolet aging.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a process for co-extruding a film by a multilayer composite film of fluorine-containing resin for an ultra-high altitude balloon, which solves the problems that the existing film material has poor mechanical property, low tensile strength and low heat sealing strength, and the gas barrier property at the position close to a heat sealing joint is reduced; the existing structural material of the film has poor high and low temperature aging resistance, and LLDPE has high and low temperature resistance range of about-65-110 ℃; after high and low temperature circulation, the material is aged, the mechanical property is reduced or the material property is invalid; gas barrier performance degradation or failure; the film has poor ultraviolet aging resistance, and the material mechanics, heat sealing and gas barrier properties are reduced or failed after ultraviolet aging.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: a multilayer composite film coextrusion film process of fluorine-containing resin for an ultra-high altitude balloon comprises the following steps:

s1, metering: adding granular nylon, polyethylene resin and other raw and auxiliary materials into a hopper of an extruder by manpower, and automatically metering, weighing and mixing according to a specific proportion.

S2, feeding and extruding: and when the extruder and the machine head meet the heat preservation requirement (namely the temperature is 220-310 ℃), starting the extruder, adding a small amount of raw and auxiliary materials into the hopper, rotating the screw at a low speed at the beginning, gradually increasing the rotating speed of the screw after the molten material passes through the machine head and is blown into a tube bubble, filling the material, and combining the fluororesin with other resins by using a customized multilayer extrusion device to prepare the multilayer co-extruded film.

S3, material lifting: the molten materials passing through the head are brought together and lifted up while a small amount of air is introduced to prevent them from sticking to each other.

S4, 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 so that the multilayer composite film is blown into a film, and then the film is co-extruded by a plurality of extruders carried by the multilayer film extruder and is extruded by the same machine head; and cooling, mechanically and automatically drawing, stretching, shaping and rolling the multilayer film in the cooling line by matching a fan arranged on the extruder with a cooling ring arranged on the machine head to prepare the multilayer film.

S5, cutting, 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.

S6, checking: and cutting a plurality of samples with the length of about 5m before and after rolling the multilayer composite film, and inspecting.

S7, waste treatment: the method is characterized in that the method is used for concentrating wastes and leftover materials produced in the production and processing of the multilayer co-extruded film and simultaneously performing harmless operation after the wastes and the leftover materials are subjected to centralized treatment.

S8, 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; and sticking labels on the films which do not meet the relevant requirements, and putting the films into a finished product raw material area for independent storage.

Preferably, the motor cooling of the multilayer film extruder in the S2 process uses fresh water for indirect cooling, and the fresh water is periodically supplemented and is not discharged.

Preferably, in S6, the temperature resistance, gas permeability, mechanical properties of the film, tensile properties, ultraviolet ray aging resistance, and adhesion and heat sealing properties are respectively tested.

Preferably, the fluororesin is co-extruded with the barrier material through multi-layer co-extrusion equipment to prepare the fluorine-containing resin high-performance helium barrier composite film.

(III) advantageous effects

The invention provides a process for co-extruding a multilayer composite film of fluorine-containing resin for an ultra-high altitude balloon, which has the following beneficial effects:

(1) according to the process for co-extruding the film by the multilayer composite film of the fluorine-containing resin for the super-altitude balloon, the high-performance multilayer composite fluorine film is prepared by adopting a flat extrusion up-blowing device; the gas barrier layer adopts a high-performance unmodified (or modified) barrier material; the three components are organically and uniformly prepared into a multilayer composite film, and the multilayer composite film is resistant to high and low temperatures; the long-term use temperature can be in the range of-150 ℃ to 150 ℃; ultraviolet aging resistance; after ultraviolet aging, the mechanical property of the multilayer composite film is basically unchanged, and the barrier property of helium or hydrogen (gas) is unchanged; high barrier of small molecule gases such as helium or hydrogen; the gas barrier property is less than or equal to 0.15L/square meter and has good heat sealing property for 24 hours; the heat sealing strength is high; the multilayer composite effect is good; can be compounded with fabric or other materials, and has strong binding power.

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 composite film coextrusion film process of fluorine-containing resin for an ultra-high altitude balloon comprises the following steps:

s1, metering: adding granular nylon, polyethylene resin and other raw and auxiliary materials into a hopper of an extruder by manpower, and automatically metering, weighing and mixing according to a specific proportion.

S2, feeding and extruding: and when the extruder and the machine head meet the heat preservation requirement (namely the temperature is 220-310 ℃), starting the extruder, adding a small amount of raw and auxiliary materials into the hopper, rotating the screw at a low speed at the beginning, gradually increasing the rotating speed of the screw after the molten material passes through the machine head and is blown into a tube bubble, filling the material, and combining the fluororesin with other resins by using a customized multilayer extrusion device to prepare the multilayer co-extruded film.

S3, material lifting: the molten materials passing through the head are brought together and lifted up while a small amount of air is introduced to prevent them from sticking to each other.

S4, 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 so that the multilayer composite film is blown into a film, and then the film is co-extruded by a plurality of extruders carried by the multilayer film extruder and is extruded by the same machine head; and cooling, mechanically and automatically drawing, stretching, shaping and rolling the multilayer film in the cooling line by matching a fan arranged on the extruder with a cooling ring arranged on the machine head to prepare the multilayer film.

S5, cutting, 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.

S6, checking: and cutting a plurality of samples with the length of about 5m before and after rolling the multilayer composite film, and inspecting.

S7, waste treatment: the method is characterized in that the method is used for concentrating wastes and leftover materials produced in the production and processing of the multilayer co-extruded film and simultaneously performing harmless operation after the wastes and the leftover materials are subjected to centralized treatment.

S8, 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; and sticking labels on the films which do not meet the relevant requirements, and putting the films into a finished product raw material area for independent storage.

In the S2 process, the motor of the multilayer film extruder is cooled by using fresh water for indirect cooling, and is periodically supplemented without being discharged, and in S6, the temperature resistance, the gas permeability, the mechanical property of the film, the ultraviolet ray aging resistance, the adhesive property and the heat sealing property of the multilayer film extruder are respectively checked.

Wherein, the fluororesin is co-extruded with the barrier material through multi-layer co-extrusion equipment to prepare the fluorine-containing resin high-performance helium barrier composite film.

Example 2

The difference from the embodiment 1 is that: in S2, the film of single-layer or multi-layer structure is set 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 temperature resistance, gas permeability, tensile property, film mechanical property, ultraviolet aging resistance, adhesive property and heat sealing property of each raw material after the preparation is finished, randomly sampling the sample of example 1, placing the sample in a container I, randomly sampling the sample of example 2, placing the sample in a container No. 2, randomly sampling the sample of the prior art, placing the sample in a container No. 3, and specifically referring to the following table:

container number	1	2	3
				Temperature resistance	Is excellent in	Good effect	In general
Gas permeability	Is excellent in	Good effect	In general
				Tensile Properties	Is excellent in	Good effect	In general
Mechanical properties of film	Is excellent in	Good effect	In general
				Ultraviolet aging resistance	Is excellent in	Good effect	In general
Adhesive performance	Is excellent in	Good effect	In general
				Heat sealability	Is excellent in	Good effect	In general

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

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.