Dispersions of polymer oil additives
A technology of dispersions and polymers, applied in the directions of additives, fuel additives, lubricating compositions, etc., can solve the problems of unsatisfactory efficacy of additives, unsatisfactory long-term stability of dispersions, insufficient miscibility, etc.
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Embodiment 1
[0209] 14 g of an ethylene-vinyl acetate copolymer having a vinyl acetate content of 25% by weight and an average molecular weight of 100,000 g / mol (measured by GPC in THF relative to poly(styrene) standards), 21 Solvesso 150ND (ExxonMobil), and a mixture of 0.4 g diethanolammonium resinate and 1.1 g diethanolammonium tall oil fatty acid salt, were homogenized with stirring and heating to 80 to 85°C. With further stirring, 10 grams of monoethylene glycol was slowly added to the solution at 80 to 85° C., followed by 14 grams of water. A white, low-viscosity dispersion is formed here. After cooling to 50°C, use the Ultra- T45 sheared the dispersion for 2 minutes at 10000 rpm.
[0210] The dispersion thus obtained had an average particle size of 1.6 microns and a viscosity (25° C.) of 625 mPa·s. After storage of an aliquot of the sample at room temperature or at 50° C. for 5 weeks, the sample was homogeneous and unchanged in viscosity.
Embodiment 2
[0212] 0.5 g of diethanolammonium resinate and 1.5 g of diethanolammonium tall oil fatty acid salt were dissolved in 13 g of monoethylene glycol and heated to 60°C. Subsequently, 36 g of a 50% solution of poly(octadecyl acrylate) having a K value of 32 (measured according to Fikentscher in a 5% solution) in xylene were added in portions with stirring over a period of 15 minutes. After homogenization, 13 g of water containing 2.5 g / l xanthan gum and 1.0 g / l biocide were added, during which time the temperature of the microdispersion formed was kept constant at 60°C. After cooling the reaction solution to 40°C, with the help of Ultra- T2B sheared it for 2 minutes at 20000 rpm.
[0213] The dispersion thus obtained had a viscosity of 140 mPa·s. After an aliquot of the sample was stored at room temperature or at 50°C for 6 weeks, the sample was homogeneous with no change in viscosity.
Embodiment 3
[0215] 33 g of behenyl acrylate grafted in a 4:1 weight ratio with a vinyl acetate content of 28% by weight and an MFI of 7 g / 10 min 190 A solution of ethylene-vinyl acetate copolymer in 22 grams of xylene was blended with 0.8 grams of diethanolammonium resinate and 2.2 grams of diethanolammonium tall oil fatty acid salt and heated to 85°C with stirring. With further stirring, 19 grams of monoethylene glycol was slowly added to the solution at 80 to 85°C, followed by 23 grams of water. A white, low-viscosity suspension formed here. After cooling to 50°C, use the Ultra- T45 sheared the suspension at 10000 rpm for 2 minutes.
[0216] The dispersion thus obtained had an average particle size of 1.7 microns and a viscosity of 270 mPa·s. After storage of an aliquot of the sample at room temperature or at 50° C. for 5 weeks, the sample was homogeneous and unchanged in viscosity.
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