Effect of addition of coal-tar pitches on adhesive properties of copolymer of ethylene with vinyl acetate
Results of studies of the effect of the addition of coal-tar pitches on the water resistance and adhesive properties of the copolymer of ethylene with vinyl acetate (CEVA) used as an adhesive layer in polymer films for protection of oil and gas pipelines against corrosion are presented. The dependence of the adhesive strength of CEVA with 12% vinyl acetate (VA) on the concentration of coal-tar pitch additives with softening temperatures of 70, 85, and 107/sup 0/C was found to be extreme with maximum adhesive strength in the concentration range of 0.8-1.4%. This increase in adhesive strength at low concentrations is thought to be due to improvement in the wetability of the melt. After long exposure (30h) to boiling water, the water resistance of the adhesive joints was improved by the addition of coal-tar pitches; but in the initial period of boiling, a decrease in water resistance was produced by the addition of coal-tar pitches. Films with pitch additives with a softening temperature of 70/sup 0/C were noted to have the highest hydrophobicity at low concentrations of the pitch additive.
- Research Organization:
- Inst. of Physical Organic Chemistry, Kiev, Ukrainian SSR
- OSTI ID:
- 6534851
- Journal Information:
- J. Appl. Chem. USSR (Engl. Transl.); (United States), Vol. 56:8; Other Information: Translated from Zh. Prikl. Khim. (Leningrad); 56: No. 8, 1856-1859(Aug 1983)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
01 COAL, LIGNITE, AND PEAT
PIPELINES
CORROSION PROTECTION
PITCHES
ADHESION
SURFACE PROPERTIES
POLYETHYLENES
POLYVINYLS
ACETIC ACID ESTERS
ADHESIVES
COAL TAR
COPOLYMERS
ETHYLENE
EXPERIMENTAL DATA
FILMS
NATURAL GAS
PETROLEUM
WATERPROOFING
ALKENES
CARBOXYLIC ACID ESTERS
DATA
ENERGY SOURCES
ESTERS
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
HYDROCARBONS
INFORMATION
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OTHER ORGANIC COMPOUNDS
POLYMERS
POLYOLEFINS
TAR
360404* - Materials- Polymers & Plastics- Physical Properties- (-1987)
010600 - Coal
Lignite
& Peat- Properties & Composition