Processes for preparing grafted copolymers

A graft copolymer, graft polymer technology, used in DVII's and lubricating oil compositions, to prepare a graft polymer for use as a dispersant viscosity index improver; In the field of branched polymers, it can solve the problems such as the limitation of extrusion method and the inability to obtain grafted products, and achieve the effect of reducing the tendency of polymerization and coupling side reactions.

Inactive Publication Date: 2004-04-28
CASTROL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, existing extrusion methods still suffer from some limitations
For example, not all types of reactants are suitable for existing extrusion methods, because they cannot enter and mix into the reaction process, and thus cannot obtain a sufficiently uniform graft product

Method used

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  • Processes for preparing grafted copolymers

Examples

Experimental program
Comparison scheme
Effect test

example

[0178] equipment and materials

[0179] A schematic diagram of the overall flow is shown in the figure.

[0180] A. Reactor Extruder

[0181] A HT-2000-F11-M-21-523-E2" twin-screw extruder from Welding Engineers' Company was used. The extruder used up to 4 inlets for liquid additives in the axial direction. A 1.5 inch (3.8 cm) thick separation plate for instrumentation was provided, and five inlets were provided in barrel 3 and 4 more inlets in barrel 4. For the twin screw section The ratio of the overall length of the extruder to its diameter ("L / D") is said to be 57: 1. The extruder also has a 3:1 L / D single screw discharge section.

[0182] B. Extruder heating

[0183] The extruder was initially heated with two-zone hot 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 process water, and the die head is electrically heated.

[0184] C. Feeding equipment

[0185] The...

example 3

[0229] Polyolefin CO-034

[0230] Polyolefin Feed Rate (lbs / hr) 35 (16kg / hr)

[0231] Monomer (% w / w: solvent) VIMA (50%: aqueous solution)

[0232] Monomer feed rate (lbs / hr, actual monomer) 0.38 (0.17kg / hr)

[0233] Initiator (% w / w: solvent) DTBP (20% naphtha solution)

[0234] Initiator feed rate (lbs / hr, actual initiator) 0.1 (0.045kg / hr)

[0235] Screw Speed ​​(RPM) 90

[0236] Temperature distribution (℃) 185, 218, 206, 192, 201

[0237] Monomer on graft polymer (%) 1.46

[0238] ADT 8

example 4

[0240] Polyolefin CO-034

[0241] Polyolefin Feed Rate (lbs / hr) 35 (16kg / hr)

[0242] Monomer (% w / w: solvent) VIMA (25% aqueous solution)

[0243] Monomer feed rate (lbs / hr, actual monomer) 0.73 (0.33 kg / hr)

[0244] Initiator (% w / w: solvent) DTBP (20% P160N solution)

[0245] Initiator feed rate (lbs / hr, actual initiator) 0.2 (0.09kg / hr)

[0246] Screw Speed ​​(RPM) 90

[0247] Temperature distribution (℃) 185, 220, 201, 187, 202

[0248] Monomer on the graft polymer (%) 1.63

[0249] ADT 16 / 8

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Abstract

Methods are disclosed for making graft copolymers. The methods comprise the steps of: (a) providing (i) an ethylene / propylene (EP) copolymer or other graftable polymer, (ii) an ethylenically unsaturated sulfur-, nitrogen- and / or oxygen-containing monomer, and (iii) an amount of an initiator sufficient to graft said monomer and EP copolymer or other graftable polymer; (b) introducing said EP copolymer or other graftable polymer into an extruder; (c) introducing said monomer into the extruder; (d) introducing said initiator into the extruder; wherein at least one of the above-identified reactants in (a) is introduced in the presence of a polar solvent; and (e) reacting said EP copolymer or other graftable polymer, monomer and initiator by operating said extruder, thereby forming the graft copolymer. This invention also relates to methods of making a dispersant viscosity index improver and methods for making a lubricating oil. This invention further relates to graft copolymer products made by the aforementioned methods.

Description

Background of the Invention [0001] The present invention relates to a method for preparing graft copolymers. This method involves the use of polar solvents in the graft polymer extrusion reaction. The present invention also relates to a method of preparing a graft polymer for use as a dispersant viscosity index improver. [0002] Solvent grafting is a well known method for preparing polymers. Typically, the various reagents are added to one or more reactors containing the solvent, either in pure form or as solutions in various solvents. Furthermore, the desired polymer product often has to be separated from the reaction solvent and / or impurities by means of suitable purification steps. As a result, these methods are limited by a number of factors, such as the availability, availability and cost of solvents, the availability and economy of the purification steps required, and the environmental concerns people have with the waste materials associated with these processes att...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F255/00C08F255/04C08F291/00C10M145/12C10M145/16C10M149/06C10M149/10C10M151/02C10N30/02
CPCC10M2221/02C10M2217/06C10M2205/022C08F255/04C10M2217/028C10M151/02C10M2209/086C10M145/16C08F255/00C10M2217/024C08F291/00C10M149/10C10M145/12C10M149/06C10M2205/04C10M143/02C10M143/10C08F226/06
Inventor I·L·戈尔德布拉特R·索尔
Owner CASTROL LTD
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