Three high performance barrier materials

According to information provided by relevant parties, in 2002, a total of approximately 250 billion beer bottles were consumed globally. The huge market capacity and sales profits attracted the scientific and industrial sectors of all countries to invest tremendous efforts to study the replacement of traditional glass beer bottles with plastic bottles. In this huge consumer market, nylon nanocomposites AegisOX, PAMXD6/nanoclay composite M9 and polyvinyl alcohol (PVA) film materials, which can be used as raw materials for plastic beer bottles, are the three most promising high-performance barrier materials.

Currently, Honeywell, USA is working to develop a nylon nanocomposite AegisOX with high barrier property and low cost, which is an activation/passivation barrier material, in which nanoclay is a passivation barrier layer. Synergy with suitable oxygen sorbents as activators. It is said that the material can reduce the oxygen transmission rate (OTR) of PA6 by 100 times, and the oxygen infiltration amount is almost zero. Some large PET bottle factories are using Aegis OX as the core of a three-layer beer bottle, and their life expectancy can reach 180 days.

The PAXD6/nano-clay barrier material M9, developed by Nanotec in cooperation with Japan's Mitsubishi Gas Chemical Company, is called Imperm and is used for the core layer of three-layer PET bottles. Imperm is said to have 100 times lower oxygen transmission than PET, 50% and 70% higher than standard PAMXD6 for carbon dioxide and oxygen, respectively. Transparency and peel resistance are the same as those of standard PAMXD6. Three-layer structure (PET/ M9/PET beer bottles can meet the shelf life requirements of the United States (110 days) and Europe (180 days). Mitsubishi Gas Chemicals has introduced "buy-and-use" M9 pellets to the market.
Polyvinyl alcohol (PVA) is a polyhydroxy polymer with properties such as water solubility, barrier properties, and biodegradability. Due to the high melting point and close to the decomposition temperature, the melt extrusion is prone to thermal decomposition, and thus the processing is difficult. To prevent thermal decomposition, traditional methods for preparing PVA films include solcast coating and wet extrusion blown film. In China, solcast coating has just been introduced this year, while wet extrusion blow molding is only found abroad. In 2003, the British Environmental Polymer Group announced that it had achieved dry extrusion blown film. The domestic Beijing Light Industry Plastic Research Institute, Sichuan United University, Beijing University of Chemical Technology and other units are also conducting PVA dry blown film research. Products come out.

PVA film products have the following characteristics: PVA film is an environmentally friendly packaging material, non-toxic, non-polluting, completely biodegradable; PVA film has a very high degree of transparency, transmittance of about 95% and has anti-ultraviolet; PVA film without Electrostatic, non-dusting, eliminates electrostatic intrusion in the packaging process, and reduces costs; PVA film has a very high barrier to gases, the barrier to oxygen is about 1000 times that of commonly used polyethylene film, polypropylene film 300 Times, barrier properties equivalent to EVOH (ethylene-vinyl alcohol copolymer), but the price is much cheaper; PVA film is insoluble in organic matter, has a very good oil resistance; PVA film has excellent heat sealing properties and viscosity, excellent printing Sex.