Fluororesin helium barrier multi-layer co-extrusion film process with good heat sealing performance

Abstract

The invention discloses a fluororesin helium barrier multi-layer co-extrusion film process with good heat sealing performance, and particularly relates to the technical field of near space overpressure balloons, the fluororesin helium barrier multi-layer co-extrusion film process comprises the following steps of S1, metering: manually pouring raw and auxiliary materials for manufacturing polyethylene resin into a hopper, and automatically metering and weighing according to a certain proportion; and S2, screw extrusion and plasticization: putting the raw and auxiliary materials in the step S1 into customized multi-layer extrusion equipment, so that the raw and auxiliary materials are combined with other resin, and preparing the multi-layer co-extrusion film. Fluororesin and other resin are combined for extrusion molding through the customized multi-layer extrusion equipment according to the stacking sequence of the fluororesin, a binding agent, a barrier layer, a binding layer and the fluororesin, the multi-layer co-extrusion film is prepared, the fluororesin is located on the outermost layer in the multi-layer structure of the multi-layer co-extrusion film, thus the multi-layer extrusion film has excellent performance of heat sealing, wear resistance, mechanical property, high and low temperature resistance, ultraviolet aging resistance and the like, and the multi-layer co-extrusion film can also be used as a barrier layer of a near space airship.

Description

technical field [0001] The invention relates to the technical field of near-space superpressure balloons, more specifically, the invention relates to a process for a multi-layer co-extrusion film of a fluororesin helium gas barrier with good heat sealing performance. Background technique [0002] Near space refers to the airspace 20 to 100 kilometers from the ground, which has attracted widespread attention in the world due to its important development and application value. Near space aircraft refers to aircraft or suborbital aircraft that can only fly in or can perform long-term and continuous flight in adjacent space. Aircraft or hypersonic cruising aircraft flying near space have advantages that aviation and aerospace vehicles do not have, especially in communication support, intelligence collection, electronic suppression, early warning, and civil use. There are different types of unpowered and powered. Near-space vehicles can be divided into unpowered, aerodynamic, scr...

AI Technical Summary

Problems solved by technology

[0003] LLDPE is linear low-density polyethylene. The toughness of the material is relatively good, but the mechanical strength is low, and the force between molecules is small, which leads to poor heat sealing and gas barrier properties of the material, and different processing techniques will also lead to poor performance of the material. There are some differences. Film casting and film blowing are relatively common process technologies. Compared with cast film, blown film has the advantage of one-time molding. The horizontal and vertical molecular chains or crystal arrangements of the film are relatively regular. The mechanical properties, gas barrier properties and heat sealing properties of the film are all improved; while the domestic multi-layer co-extruded fluororesin film blow molding stretching process is in a blank stage