Processes for preparing grafted copolymers
A technique of graft copolymers, graft polymers, applied in the manufacture of such graft polymers, the preparation of graft polymers used as dispersant viscosity index improvers, DVII's and lubricating oil compositions, capable of Solve the limitations of the extrusion method and the inability to obtain grafted products, etc., and achieve the effect of reducing the tendency of polymerization coupling side reactions
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[0178] equipment and materials
[0179] A schematic diagram of the overall process is shown in the figure.
[0180] A. Reactor extruder
[0181] Use the HT-2000-F11-M-21-523-E2 " twin-screw extruder of Welding Engineers' company. This extruder uses up to 4 liquid additive injection ports along the axial direction. For two injection ports Equipped with a 1.5 inch (3.8 cm) thick separation plate for instrumentation, 5 inlets in barrel 3 and 4 inlets in barrel 4. For the twin-screw section Say the ratio of the overall length of the extruder to its diameter ("L / D") is 57: 1. The extruder also has a 3: 1 L / D single screw discharge section.
[0182] B. Extruder heating
[0183] The extruder is initially heated with two-zone thermal oil. The first zone includes the second to fifth barrels, and the second zone is used to heat the sixth to ninth barrels. The feed barrel is cooled with production water, and the die head is heated by electricity.
[0184] C. Feeding equipment
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example 3
[0208] Example 3 Polyolefin CO-034 Polyolefin Feed Rate (lbs / hr) 35 (16 kg / hr) Monomer (% w / w: Solvent) VIMA (50%: Aqueous Solution) Monomer Feed Rate (lbs / hr, Actual monomer) 0.38 (0.17kg / hr) Initiator (% w / w: solvent) DTBP (20% naphtha solution) Initiator feed rate (lbs / hr, actual initiator) 0.1 (0.045kg / hr ) screw speed (RPM) 90 temperature profile (°C) 185,218,206,192,201 monomer on graft polymer (%) 1.46ADT 8
example 4
[0209] Example 4 Polyolefin CO-034 Polyolefin Feed Rate (lbs / hr) 35 (16 kg / hr) Monomer (% w / w: Solvent) VIMA (25% Aq) Monomer Feed Rate (lbs / hr, Actual Monomer) 0.73 (0.33 kg / hr) Initiator (% w / w: solvent) DTBP (20% P160N solution) Initiator feed rate (lbs / hr, actual initiator) 0.2 (0.09 kg / hr) screw speed (RPM) 90 Temperature distribution (°C) 185, 220, 201, 187, 202 Monomer on graft polymer (%) 1.63ADT 16 / 8
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