Oil field mats
OwnerGerald O. Yorkinventor
Life of this patent
Estimating the term…
Abstract
Oil-resistant resilient mats to protect oil field workers from dangerous, high voltage electrical discharge comprise a first oil-resistant flexible resilient elastomer of extremely high dielectric strength which is usable by itself as a mat and also in combination with other oil-resistant elastomers of higher mechanical strength but less dielectric strength at high voltages and with metallic electrically conductive meshes to equalize mechanical and electrical stress across the first elastomer. The combination of metallic mesh and elastomer of high electrical resistance at high voltage provides mechanically strong and oil resistant mats that protect personnel in oil fields against high voltage and surges. The high mechanical strength elastomer layers mechanically protect the conductive wire mesh as well as the first elastomer.
Claims8
A protective mat comprising an oil-resistant elastomer with d.c. proof test voltage in excess of 70,000 volts comprising the formulation of 1503 type rubber, a cold polymerized styrene butadiene with a fatty acid emulsifier formed by acid coagulation, 23.5% target bound styrene, with a nominal Mooney viscosity of 52 (ML 1+4) 212.degree. F. and is non staining (80 parts);
- CIS-4-1203, a solution butadiene dry rubber with CIS content of 93% and having a nominal Mooney viscosity (ML 1+4, 100.degree. C.) of 45 (20 parts);
- Ca CO3 (25 parts);
- Mineral Rubber (50 parts);
- Zinc Oxide (10 parts);
- Stearic acid (1 part);
- Octamine (1 part);
- Sunproof wax (2 parts);
- PbO (2 parts);
- 90% of the zinc salt of 2-mercapto-benzo thiazole and 10% hydrocarbon wax (21/2 parts);
- tetramethyl thiuram monosulphide (2.3 parts);
- and Sulfur (1.8 parts);
- which material provides a scorch test of 9.5 minutes at 280.degree. F. and has a Shore A hardness of 56.
A protective mat comprising a first layer composed of an oil-resistant elastomer with proof test voltage in excess of 70,000 volts in combination with a second, oil-resistant elastomer layer of greater mechanical strength than and of lesser insulating capacity at high voltage than said first layer, said second elastomer layer firmly attached to the top of said first layer, and wherein
- said first layer comprises a composition composed of 1503 type rubber, a cold polymerized styrene butadiene with a fatty acid emulsifier formed by acid coagulation, 23.5% target bound styrene, with a nominal Mooney viscosity of 52 (ML 1+4) 212 degrees F. and is non staining (80 parts);
- CIS-4-1203, a solution butadiene dry rubber with CIS content of 93% and having a nominal Mooney viscosity (ML 1+4, 100 degrees C.) of 45 (20 parts);
- CA CO3 (25 parts);
- Mineral Rubber (50 parts);
- Zinc Oxide (10 parts);
- Stearic acid (1 part);
- Octamine (1 part);
- Sunproof wax (2 parts);
- PbO (2 parts);
- 90% of the zinc salt of 2-mercapto-benzo thiazole and 10% hydrocarbon wax (21/2 parts);
- tetramethyl thiuram monosulphide (2.3 parts);
- and Sulfur (1.8 parts);
- which material is compounded to provide a scorch test of 9.5 min. at 280 degrees F. and has a Shore A hardness of 56;
- and said second layer comprises a composition composed of polychloroprene with Mooney viscosity (ML 1+2.5, 212 F.) 50, (100 parts);
- carbon black, particle size average mu, 19, surface area average m.sup.2 /gm 140, DBP 113, (30 parts);
- Stearic Acid, (1 part);
- Zinc Oxide, (5 parts);
- Magnesium Oxide, (4 parts);
- Phenyl-beta- naphthyl amine, (2 parts);
- a napthenic oil ASTM D 2226 Type 103, sp. gr. 0.9194, aromatic 42.9%, liq. visc. 156 SUS at 100.degree. F. Flash pt. 330.degree. F. VGC 0.878 aniline pt. 156.degree. F., (4 parts);
- Coumarone indene resin, (4 parts);
- Petrolatum, (2 parts);
- Tetra methylthiuram monosulfide, (0.6 parts);
- Diphenyl-guanidine, (0.6 parts);
- and Sulfur, (1 part);
- which material provides a Scorch test (at 250.degree. F. (121.degree. C.)+5), 30.0;
- Shore A Hardness 66;
- and Specific Gravity 1.34.
Dependencies are inferred from the claim text.