Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/04—Oxygen-containing compounds
  • C08K5/05—Alcohols; Metal alcoholates
  • C08K5/057—Metal alcoholates

Definitions

• the present invention relates to fluorocarbon polymers which contain organic titanates as fillers.
• Fluorocarbon polymers are being used to an increasing extent as materials with desired, selectively adjustable properties.
• fluorocarbon polymers can be simple polyfluorocarbons such as e.g. polymerized fluoroolefins or fluoroalkoxy polymers, copolymers such as e.g. Copolymers of fluorinated ethylene / propylene monomers or terpolymers or also block polymers such as e.g. those which consist of a polyfluorocarbon soft segment and a polyfluorocarbon hard segment which are bonded to one another by polymerisation.
• Such fluorocarbon polymers often also contain inorganic or organic fillers in order to influence the mechanical and / or electrical properties of the plastics.
• inorganic or organic fillers in order to influence the mechanical and / or electrical properties of the plastics.
• the use of such fillers has the disadvantage that other important properties of the plastics are adversely affected. For example, it has been found that the melt viscosity of the polyfluorocarbons is generally increased to such an extent by the addition of fillers that the plastics are difficult or impossible to extrude at all.
• the aim of the present invention is therefore fluorocarbon polymers which correspond in their mechanical and electrical properties to fluorocarbon polymers, but which have a lower melt viscosity than these. That goal will achieved according to the invention with polyfluorocarbons which contain organic titanates as fillers.
• JP-OS 58 16 9572 dated March 29, 1982 describes the production of water-repellent layers for clothing, in particular sports clothing, which can consist of fluorine-containing polymers with the addition of N-butyl titanate or 2-ethylhexyl titanate in combination with tripropoxy titanium stearate.
• the fluorocarbon polymers to which fillers in the form of organic titanates are added according to the invention can be any polyfluorocarbon plastics. examples for this are
• fluorinated olefins such as hexafluoroethylene, perfluoroalkoxy compounds, fluorinated vinyl or vinylidene compounds or other fluorocarbon monomers
• Block polymers e.g. Terblock polymers which can also consist of segments with completely different physical properties, for example a so-called soft segment and a so-called hard segment, which are connected to one another by chemical crosslinking;
• Block polymers mechanically blended with simple polyfluorocarbon compounds
• Polyfluorocarbon plastics that are or have been foamed using a blowing agent, as well as other fluorocarbon plastics.
• the organic titanates to be used according to the invention can be selected from a large number of titanates.
• suitable titanate compound classes are:
• alkoxy compounds such as neoalkoxytriisostearoyl titanate, isopropyltriisostearyl titanate, methacryldiisostearoyl titanate, di (cumylphenylate) oxyacetate;
• sulfonyl compounds such as dodecylbenzenesulfonyl titanate, tridodecylbenzenesulfonyl titanate;
• Phosphorus compounds such as tri (dioctylphosphato) titanate, tri (dioctyl pyrophosphate) titanate, tetraisopropyl di (dioctylphophito) titanate, tetraoctyloxititanium di- (ditridecylphosphite), tetra (2,2-diallyloxymethyl) -1,1-butoxytitanium -di (di-tridecyl phosphite),
• Chelate compounds other than those already mentioned above, such as tri (N-ethylamino-ethylamino) titanate;
• Quaternary titanates such as acrylic functional amines.
• organic titanates according to the invention lowers the melt viscosity of the fluorocarbon polymers, in particular those crosslinked with conventional fillers, to the extent that a melt extrusion is made possible.
• the melt viscosity is reduced to 1/6 of the original value, so that the material obtained can be easily extruded even if thin wall thicknesses are to be achieved.
• fluorocarbon polymers with inorganic additives are those with mineral fibers. These mineral fibers consist for example. Caicium aluminosilakates, are about 3 mm long and are contained in the plastic in an amount of about 25 wt .-%. By adding neoalkoxy-tri (N-ethylamino-ethylamino) titanate, the melt viscosity is reduced to about 1/5 of the original value, so that this material is suitable for injection molding even in very thin sections and sections.
• titanate additive according to the invention is that the elongation and tensile strength of the end product are often also increased.
• the titanate additives according to the invention can also be used for foamed fluorocarbon polymers.
• poly (ethylene tetrafluoro ethylene) (EFTE) using a blowing agent such as magnesium carbonate, azodicarbonamide, P-toluenesulfonyl compounds or the like. be foamed.
• EFTE poly (ethylene tetrafluoro ethylene)
• a blowing agent such as magnesium carbonate, azodicarbonamide, P-toluenesulfonyl compounds or the like.
• isopropyl tri (N-ethylamino-ethylamino) titanate not only achieves such a low melt viscosity that the material can be extruded, but it is additionally achieved that the size of the cells in the foam becomes smaller and the cells are distributed more evenly in the foamed material.
• the end product has much better mechanical and electrical properties than that without the addition of titanate.
• Fluorinated polyethylene / propylene is mixed with super conductive carbon black.
• This material will. e.g. used for EMI shielding, for low-noise coaxial cables or for heating cables with or without temperature control.
• carbon black has the consequence that the melt viscosity is increased in such a way that melt extrusion is difficult or impossible at all.
• melt viscosity is reduced so significantly that melt extrusion is possible without difficulty.
• ETFE 80 parts by weight of ETFE are mixed with 20 parts by weight of glass fibers in a drum.
• the mixture is then extruded at 290 ° C. in an extruder (compounding). All parts of the extruder that come into contact with the mixture consist of a metal that is not attacked by the mixture. Stainless steel, for example, is unsuitable for this. Hostalloy, for example, is suitable.
• the material obtained through compounding leaves the extruder in the form of an endless rod. This is cooled in a water bath and then cut into short pieces. In injection molding machines (or extruders), this material is again heated to about 290 ° C and injected into metal molds.
• Comparative example 2 is repeated with the difference that 0.5% by weight of neoalkoxytriisostearoyl titanate is added to the mixture of 80% ETFE and 20% glass fibers according to the invention. After thorough mixing in the drum, this material is extruded at 290 ° C. and cooled well in water and then cut into pieces. Laboratory tests show that by adding the organic titanate the melt viscosity to about 2.5 g / 10 min. has dropped.
• This material is heated to the thermoplastic temperature of 290 ° C in extruders or injection molding machines. Thanks to the low viscosity, the surface of the melt castings becomes smooth. The material flows well into the molds and also fills small and narrow parts of the mold; Cavities do not arise.

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• Chemical & Material Sciences (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

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• 1985
  • 1985-01-30 DE DE19853502994 patent/DE3502994A1/de not_active Ceased
• 1986
  • 1986-01-29 JP JP61500804A patent/JPS62501849A/ja active Granted
  • 1986-01-29 WO PCT/DE1986/000029 patent/WO1986004596A1/de not_active Ceased

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