Process for the manufacture of polymeric materials with a high c

Details Process for the manufacture of polymeric materials with a high c Process for the manufacture of polymeric materials with a high c

1996-04-17

1998-04-07

Jagannathan, Vasu

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524414, 524423, 524783, 524789, C08K 330

Patent

active

057366080

DESCRIPTION:

BRIEF SUMMARY
The subject of this invention is a process for the manufacture of polymeric materials with a high chemical and mechanical resistance, particularly suitable in chemical, electrochemical and non-ferrous metals industries, as well as a polymeric material with a high chemical and mechanical resistance.
It is commonly known that synthetic resins are used either as binders in building materials such as mortars and concretes or as components of chemo- or thermosetting composites containing in their composition fillers being many a time industrial wastes such as sawdust and smoke-box ashes. Thus, Polish Patent Specification no. 65 677 discloses a floor mix containing 30-40% of polyester resins, about 5% of epoxide resins, 55-65% of mineral fillers and an accelerant and hardener, the whole showing a mass density of 2.2 kg/dm.sup.3. There is also known a floor mix containing 100 parts of epoxide resins, 5-20 parts vegetable epoxy oil, 10-20 parts of xylene, 8-12 parts of triethanolamine, 200-400 parts of kermesite with a grain size of up to 5 mm and 20-150 parts of dry microspheres with a bulk density of 0.35-0.42 kg/dm.sup.3, thermal conductivity 0.04-0.1 W/mK and compression strength 30-35 MPa. There are also commonly known problems in utilization of industrial wastes, including waste phosphogypsum resulted in considerable amounts from the manufacture of phosphoric acid from apatites. One of the utilization processes; in accordance with Polish Patent Specification no. 119 692, consists of elimination of radium, uranium, fluorine and phosphorous compounds from phosphogypsum through decomposition by means of phosphoric acid. Another process, according to Polish Patent Application no. P. 287 016, concerns the manufacture of gypsum from waste phosphogypsum by adding about 6 parts by weight of waste ferrous sulphate and about 4.7 parts by weight of barium chloride to 1000 parts by weight of waste phosphogypsum, and then calcinating the mixture with quicklime at temperature 350-500 K. Another Polish Patent Specification no. 147 599 discloses the manufacture of building phosphogypsum materials comprising the preparation of a binding slurry by mixing a thermally treated phosphogypsum with make-up water and adding antiefflorescent agents in the form of sulphonated polycondensating resins, organic and inorganic silicon salts alkali metals. It is also known from Polish Patent Application no. P. 283 240 that waste phosphogypsum can be combined with polyester resins to prepare a material which is characterizes by good mechanical and chemical resistance and low water and oil absorptions. According to Polish Patent Application no. P. 299 472 and P. 299 473, it is also possible to combine, in an anhydrous system, epoxide resins and/or polyester resins with phosphogypsum or phosphogypsum and glass-forming oxides or phosphogypsum and magnetite to prepare ceramic-like materials with special properties including good mechanical and chemical resistance, being easily formable, especially by casting, and showing good adherence to various materials such as wood, metals, glass, and susceptible to processing by machining, grinding and cutting, and suitable for a wide application. There is also known from U.S. Pat. No. 3,873,492 a process for the manufacture of a mixed materials containing gypsum and a thermoplastic resin; the gypsum to be used for the mixture is previously powdered and impregnated with a polysulphone resin.
It has unexpectedly appeared that using waste phosphogypsum, but only after its previous thermal treatment, in a composition with vinylester resins, one can prepare materials with a very high resistance both to acidic and alkaline media, showing water absorption below 0.5%, Charpy impact strength over 1.55 kJ/m.sup.2, bending strength over 15 MPa, compression strength over 75 MPa, thermal conductivity index below 0.485 W/mK, the materials being also safe to health and showing a radioactivity level corresponding to that of cement and red bricks. Moreover, when glass-forming oxides are added to the materials they are char

REFERENCES:
patent: 4151000 (1979-04-01), Bachelard et al.
Chemical Abstracts, vol. 104, No. 14, Apr. 7, 1986, Abstract No. 110705, Pashchenko et al., "Modified Phosphogypsum--an Active Filler for Plastics", see abstract & Stroit, Mater, Konstr., No. 3, 1984, p. 14.
Derwent Publications Ltd., London, GB; AN 91-278959 & SU-a-1 599 406 (Metal Protection) see abstract.
Derwent Publications Ltd., London, GB; AN 89-136613 & SU-A-1 433 932 (Tashkent Poly) see abstract.

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