Technology and equipment for production of porous material from polytetrafluoroethylene by laser ablation
Belarus research institute developed a method to produce porous material from polytetrafluoroethylene (PTFE). The material can be made in form of wool or felt. The advantages of high surface hydrophobicity, chemical and temperature resistance come from PTFE. Typical applications of material are filtration of toxic chemicals and medicine. The institute seeks cooperation under manufacturing agreement, commercial agreement with technical assistance or joint venture agreement.
Industrial partners for: * production of porous material from polytetrafluoroethylene by laser ablation using the available equipment under manufacturing agreement * buying the equipment under commercial agreement with technical assistance * production of material or equipment for production of porous material from polytetrafluoroethylene by laser ablation under joint venture agreement. Tasks to be performed: financing of joint venture activities, participation in the enterprise management.
Belarus research institute offers porous polytetrafluoroethylene (PTFE) material and equipment for its production. Polytetrafluoroethylene has outstanding set of properties (high melting temperature, low coefficient of friction, chemical inertness etc.) which results in its wide usage. But because of those properties the processing of PTFE can be difficult and expensive and also leaves small choice of methods to produce PTFE fibers and porous materials from it. In the developed method the solid PTFE is evaporated by a laser beam and condensed on cold surface as fibres. At present, the porous material produced in form of wool or felt. The wool consists of fibres 5-15 micrometers mean diameter and up to 10 mm length. The felt consists of shorter (0.2-2 mm) fibres that are fused at contact points. Characteristics of PTFE-felt: * thickness: from 1 mm and up to ca. 20 mm * density: 300-400 kg/m3 * mean pore size: 10-20 µm * open porosity: 80-90% * permeability factor: (0.5-5)*10e-12 m2 * high surface hydrophobicity * chemical and thermal resistance is that of PTFE * tensile strength (non-reinforced): 0.02-0.03 MPa * elongation 15-20% The method allows to form porous material on technological substrates, from which it is subsequently removed, and also directly on products, incl. surfaces of complex shape. The material is used for fine filtration of any gases or liquids, incl. aggressive chemicals, over a wide range of temperatures (-150..+250 С). Compared to filters from metallic foams or porous metals, porous PTFE is more efficient in catching oil-water aerosols and have several orders of magnitude more contaminant capacity. Several trials were made to use porous PTFE in surgery as graft material for soft tissue defects. The porous PTFE can be used as a component of polymer composites to improve durability and hydrophobic properties. The institute is looking for industrial partners interested in: * production of porous material using the available equipment under manufacturing agreement (the institute is ready to produce small batches of material on its own equipment according to the customer requirements), * buying the equipment under commercial agreement with technical assistance (the institute offers equipment for production of porous material according to specification, documentation, technical consultancy, assistance with installation, maintenance and repair), * joint production of material or equipment for production of porous material under joint venture agreement (the institute's contribution can be know-how, documentation, technical consultancy, assistance with installation, maintenance and repair, participation in the enterprise management).
Advantages and innovations
The porous PTFE material is extremely stable to any aggressive substances in liquid, gas or vapor state over a wide range of the temperatures (-150 up to +250 C). The difference between porous PTFE and porous polystyrene or polyolefin based materials is the high surface hydrophobicity.
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