Thioharnstoff

Gefahreninformationscode (GHS)

• Bildanzeige (GHS)

  

• Alarmwort

  Warnung

• Gefahrenhinweise

  H302：Gesundheitsschädlich bei Verschlucken.

  H351：Kann vermutlich Krebs verursachen.

  H411：Giftig für Wasserorganismen, mit langfristiger Wirkung.

• Sicherheit

  P201：Vor Gebrauch besondere Anweisungen einholen.

  P202：Vor Gebrauch alle Sicherheitshinweise lesen und verstehen.

  P264：Nach Gebrauch gründlich waschen.

  P264：Nach Gebrauch gründlich waschen.

  P273：Freisetzung in die Umwelt vermeiden.

  P301+P312：BEI VERSCHLUCKEN: Bei Unwohlsein GIFTINFORMATIONSZENTRUM/Arzt/... (geeignete Stelle für medizinische Notfallversorgung vom Hersteller/Lieferanten anzugeben) anrufen.

  P308+P313：BEI Exposition oder falls betroffen: Ärztlichen Rat einholen/ärztliche Hilfe hinzuziehen.

Thiourea Chemische Eigenschaften,Einsatz,Produktion Methoden

• ERSCHEINUNGSBILD

  WEISSE KRISTALLE ODER PULVER.

• CHEMISCHE GEFAHREN

  Zersetzung beim Erhitzen unter Bildung giftiger Rauchemit Stickstoffoxidenund Schwefeloxiden. Reagiert sehr heftig mitAcrolein, starken Säurenund starken Oxidationsmitteln.

• ARBEITSPLATZGRENZWERTE

  TLV nicht festgelegt (ACGIH 2005).
  MAK: Sensibilisierung der Haut; Photosensibilisierung; Krebserzeugend Kategorie 3B; (DFG 2005).
  

• AUFNAHMEWEGE

  Aufnahme in den Körper durch Inhalation des Aerosols und durch Verschlucken.

• INHALATIONSGEFAHREN

  Verdampfung bei 20°C vernachlässigbar; eine gesundheitsschädliche Partikelkonzentration in der Luft kann jedoch schnell erreicht werden.

• WIRKUNGEN BEI KURZZEITEXPOSITION

  WIRKUNGEN BEI KURZZEITEXPOSITION:
  Die Substanz reizt die Augen.

• WIRKUNGEN NACH WIEDERHOLTER ODER LANGZEITEXPOSITION

  Wiederholter oder andauernder Kontakt kann zu Hautsensibilisierung führen. Möglich sind Auswirkungen auf die Schilddrüse. Möglicherweise krebserzeugend für den Menschen.

• LECKAGE

  Gefahrenbereich verlassen! Fachmann zu Rate ziehen! NICHT in die Kanalisation spülen. Verschüttetes Material in abgedeckten Behältern sammeln; falls erforderlich durch Anfeuchten Staubentwicklung verhindern. Reste sorgfältig sammeln. An sicheren Ort bringen. NICHT in die Umwelt gelangen lassen. Chemikalienschutzanzug. Persönliche Schutzausrüstung: Atemschutzgerät, P2-Filter für schädliche Partikel.

• R-Sätze Betriebsanweisung:

  R22:Gesundheitsschädlich beim Verschlucken.
  R40:Verdacht auf krebserzeugende Wirkung.
  R51/53:Giftig für Wasserorganismen, kann in Gewässern längerfristig schädliche Wirkungen haben.
  R63:Kann das Kind im Mutterleib möglicherweise schädigen.

• S-Sätze Betriebsanweisung:

  S36/37:Bei der Arbeit geeignete Schutzhandschuhe und Schutzkleidung tragen.
  S61:Freisetzung in die Umwelt vermeiden. Besondere Anweisungen einholen/Sicherheitsdatenblatt zu Rate ziehen.

• Beschreibung

  Thiourea appears as white crystal/powder, is combustible, and on contact with fire, gives off irritating or toxic fumes/gases. Thiourea is a reducing agent used primarily in the production of bleached recycled pulp. In addition, it is also effective in the bleaching of stone groundwood, pressurised groundwood. Thiourea undergoes decomposition on heating and produces toxic fumes of nitrogen oxides and sulphur oxides. It reacts violently with acrolein, strong acids, and strong oxidants. The main application of thiourea is in textile processing and also is commonly employed as a source of sulphide. Thiourea is a precursor to sulphide to produce metal sulphides, for example, mercury sulphide, upon reaction with the metal salt in aqueous solution. The industrial uses of thiourea include production of flame-retardant resins and vulcanisation accelerators. Thiourea is used as an auxiliary agent in diazo paper, light-sensitive photocopy paper, and almost all other types of copy paper. Thiourea is used in many industrial applications, including as a chemical intermediate or catalyst, in metal processing and plating, and in photoprocessing.

• Chemische Eigenschaften

  Thiourea consists of colorless, lustrous crystals or powder with a bitter taste.

• Chemische Eigenschaften

  white crystals or powder

• Verwenden

  Used in determination of bismuth.

• Verwenden

  The most common uses for thiourea have been for the production of thiourea dioxide (30%), in leaching of gold and silver ores (25%), in diazo papers (15%), and as a catalyst in the synthesis of fumaric acid (10%) (IARC 2001). It has also been used in the production and modification of synthetic resins. Other uses of thiourea are as a photographic toning agent, in hair preparations, as a drycleaning agent, in the synthesis of pharmaceuticals and pesticides, in boiler-water treatment, and as a reagent for bismuth and selenite ions. It has also been used in textile and dyeing auxiliaries, in the production of industrial cleaning agents (e.g., for photographic tanks and metal surfaces in general), for engraving metal surfaces, as an isomerization catalyst in the conversion of maleic to fumaric acid, in copper-refining electrolysis, in electroplating, and as an antioxidant. Other uses have included as a vulcanization accelerator, an additive for slurry explosives,as a viscosity stabilizer for polymer solutions, and as a mobility buffer in petroleum extraction. It is also used as an ingredient of consumer silver polishes (HPD 2009), and has been used in the removal of mercury from wastewater by chlorine-alkali electrolysis (IARC 1974, 2001, WHO 2003).

• Verwenden

  Chaotropic agent; strong denaturant. Increases solubility and recovery of proteins

• Verwenden

  Thiourea is used in the manufacture of resins,as a vulcanization accelerator, and as aphotographic fixing agent and to removestains from negatives.

• Verwenden

  The product is wildly used in pharmaceutical industry, agricultural, chemicals, metallurgical industry, petroleum and so on. It is also main material for producing thiourea dioxide(CH1N2O2S).

• Verwenden

  In animal glue liquifiers and silver tarnish removers. Photographic fixing agent and to remove stains from negatives; manufacture of resins; vulcanization accelerator; a reagent for bismuth, selenite ions.

• synthetische

  Thiourea is manufactured by heating ammonium thiocyanate at 140-145??C for about 4 hours; equilibrium is established when about 25% of the thiocyanate is converted to thiourea.Thiourea may also be prepared by the interaction of cyanamide and hydrogen sulphide:
  
  Thiourea closely resembles urea in that reaction with formaldehyde gives methylol derivatives and then resinous condensates which on continued heating yield network structures. Thiourea-formaldehyde resins are slower curing than urea-formaldehyde resins and the hardened products are more brittle and more water-resistant. At one time thiourea-formaldehyde resins were added to urea-formaldehyde resins to give mouldings and laminates with improved water-resistance. These mixed resins have now been largely superseded by melamine-formaldehyde resins which give products with better resistance to heat.

• Vorbereitung Methode

  Thiourea is formed by heating ammonium thiocyanate at 170 °C (338 °F). After about an hour, 25% conversion is achieved. With HCl, thiourea forms thiourea hydrochloride; with mercuric oxide, thiourea forms a salt; and with silver chloride, it forms a complex salt.

• Definition

  thiourea: A white crystalline solid,(NH₂)₂CS; r.d. 1.4; m.p. 182°C. It isused as a fixer in photography.

• Definition

  A colorless crystalline organic compound (the sulfur analog of urea). It is converted to the inorganic compound ammonium thiocyanate on heating. It is used as a sensitizer in photography and in medicine.

• Definition

  ChEBI: The simplest member of the thiourea class, consisting of urea with the oxygen atom substituted by sulfur.

• Allgemeine Beschreibung

  White or off-white crystals or powder. Sinks and mixes with water.

• Air & Water Reaktionen

  Water soluble.

• Reaktivität anzeigen

  Thiocarbamide is a white crystalline material or powder, toxic, carcinogenic. When heated to decomposition Thiocarbamide emits very toxic fumes of oxides of sulfur and oxides of nitrogen. Violent exothermic polymerization reaction with acrylaldehyde (acrolein) [MCA SD-85, 1961], violent decomposition of the reaction product with hydrogen peroxide and nitric acid [Bjorklund G. H. et al., Trans. R. Soc. Can.,1950, 44, p. 28], spontaneous explosion upon grinding with potassium chlorate [Soothill, D., Safety Management, 1992, 8(6), p. 11].

• Hazard

  A questionable carcinogen. May not be used in food products (FDA); skin irritant (allergenic).

• Health Hazard

  Poisonous inhaled or swallowed. Irritating to skin; may cause allergic skin eruptions.

• Health Hazard

  The acute oral toxicity of thiourea in mostanimals is of low order. The oral LD50 values reported in the literature show variation.Symptoms of chronic effects in rats includebone marrow depression and goiters. Administration of 32.8 mol of thiourea in chickembryos on day 17 of incubation resultedin the accumulation of parabronchial liquidin those embryos (Wittman et al. 1987). Theinvestigators have attributed such changes tothe toxic effects of thiourea, rather to than aretardation of pulmonary development.
  Dedon and coworkers (1986) observed thepossible protective action of thiourea againstplatinum toxicity. Thiourea and other sulfur-containing nucleophiles have the ability tochelate and remove platinum from biochemical sites of toxicity.
  Oral administration of thiourea resultedin tumors in the liver and thyroid in rats.It is carcinogenic to animals and has shownsufficient evidence.

• Brandgefahr

  Noncombustible solid. There is no report of any explosion resulting from reactions of thiourea. Small amounts of thiourea in contact with acrolein may polymerize acrolein, which is a highly exothermic reaction.

• Landwirtschaftliche Anwendung

  Thiourea is a sulphur analogue of urea. It is a crystalline and colorless solid which is relatively insoluble in water. Thiourea, capable of breaking the dormancy of seeds, is used to stimulate seed germination. Seeds are soaked for less than 24 hours before planting.

• Kontakt-Allergie

  Thiourea is used as a cleaner agent for silver and cop- per, and as an antioxidant in diazo copy paper. It can induce (photo-) contact dermatitis.

• Biochem/physiol Actions

  Thiourea is a free radical scavenger of the peroxide radical. It was shown to inhibit lipid peroxidation and ultraviolet (UV)-induced crosslinking of collagen. Bud dormancy in plants can be inhibited by thiourea, which is used as a growth stimulator. It is also known to be used in the treatment of hyperthyroidism.

• mögliche Exposition

  Thiourea is used as rubber antiozonant, toning agent; corrosion inhibitor; and in pharmaceutical manufacture; in the manufacture of photosensitive papers; flame-retardant textile sizes; boiler water treatment. It is also used in photography; pesticide manufacture; in textile chemicals.

• Carcinogenicity

  Thiourea is reasonably anticipated to be a human carcinogen based on sufficient evidence of carcinogenicity from studies in experimental animals.

• Versand/Shipping

  UN2811 Toxic solids, organic, n.o.s., Hazard Class: 6.1; Labels: 6.1-Poisonous materials, Technical Name Required. UN3077 Environmentally hazardous substances, solid, n.o.s., Hazard class: 9; Labels: 9-Miscellaneous hazardous material, Technical Name Required.

• läuterung methode

  Crystallise thiourea from absolute EtOH, MeOH, acetonitrile or water. Dry it under vacuum over H2SO4 at room temperature. [Beilstein 3 IV 342.]

• Inkompatibilitäten

  Dust may form explosive mixture with air. Reacts violently with acrolein, strong acids (nitric acid). Incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, strong bases, strong acids, oxoacids, epoxides.

• Waste disposal

  Consult with environmental regulatory agencies for guidance on acceptable disposal practices. Generators of waste containing this contaminant (≥100 kg/mo) must conform with EPA regulations governing storage, transportation, treatment, and waste disposal.

Thiourea Upstream-Materialien And Downstream Produkte

Thioharnstoff Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

Global(586)Suppliers

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