1,1-Dichloroethene

  • Vinylidenedichloride
  • Vinylidene
  • 1,1 -dichloroethylene

Colorless to yellowish flammable liquid with a sweet odor

Liquid

1.25 g · cm -3

-122 ° C

32 ° C.

660 hPa ( 20 ° C)

Poorly in water (2.5 g · l-1 at 20 ° C)

1.4249 (20 ° C)

Risk

8 mg · m-3

-23.9 KJ / mol

Template: Infobox chemical / molecular formula search available

1,1- dichloroethene ( vinylidene chloride also ) is an unsaturated halogenated hydrocarbon which does not occur in nature and as a starting material for the manufacture of the plastic polyvinylidene chloride ( PVDC ) serves.

Representation

The technical description is made of the intermediate 1,1,1-trichloroethane ( CCl 3 -CH 3 ) possible by cleaving with aqueous sodium hydroxide (NaOH) hydrochloric acid.

Properties

1,1- dichloroethene is a sharp- smelling, colorless liquid that is insoluble in water, soluble in ethanol, diethyl ether, acetone, benzene and chloroform. The vapor pressure function is given by Antoine corresponding log10 (P) = A- ( B / ( T C)) (P in kPa, T in K) with A = 4.10780, B = 1104.726 and C = -35.403 in temperature range from 244.79 K to 305.6 K. dichloroethene is very flammable. The compound has a flash point of -25 ° C. The explosion range is from 6.2 % by volume as the lower explosive limit ( LEL) and 16 % by volume as the upper explosive limit ( UEL).

Use

Main use is the polymerization of polyvinylidene chloride (PVDC ), usually as a copolymer with other monomers such as vinyl chloride or acrylonitrile. Brand names of the products are Diophan, Vertan, diorite, Saran and Saranex. These thermoplastics are processed into films, coatings or fibers for special fabric, acid-resistant ropes and bristles. Furthermore, it is used in semiconductor production for preparing highly pure SiO2filmen.

Safety / toxicity

1,1- dichloroethene acts on the central nervous system and causes symptoms such as fatigue, intoxication, seizures, and unconsciousness produced at high concentrations. The MAK value for vinylidene chloride is 20 mg/m3. There is a suspicion of a carcinogenic effect.

CAS registry number PubChem Dangerous Substances Directive (67/548/EEC) Antoine equation Flammability limit CRC Handbook of Chemistry and Physics Digital Object Identifier 1,2-Dichloroethene 1,1-Dichloroethane Integrated Authority File
10006
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