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Graft copolymers based on polyolefin backbone and methacrylate side chains

A graft copolymer and side chain technology, applied in the field of oil-soluble graft copolymers, can solve problems such as layer formation

Active Publication Date: 2018-12-21
EVONIK OPERATIONS GMBH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when a concentrated PAMA solution in mineral oil (30 to 70% by weight) was mixed with a concentrated OCP solution at a higher concentration (8 to 12% by weight), a phase separation of the polymer occurred, which occurred at Long storage periods may cause layer formation

Method used

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  • Graft copolymers based on polyolefin backbone and methacrylate side chains
  • Graft copolymers based on polyolefin backbone and methacrylate side chains
  • Graft copolymers based on polyolefin backbone and methacrylate side chains

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0211] Embodiment 1: the synthesis of graft copolymer P1-P10

[0212] The graft copolymers P1-P10 of the present invention were synthesized according to the procedure shown in Scheme 2:

[0213]

[0214] Scheme 2: Sequential ROMP, ARGET ATRP and hydrogenation to prepare graft copolymers P1-P10.

[0215] step (a)

[0216] The synthesis of polymer A was carried out according to the procedure of Y. Xu et al. (Macromolecules, 2012, 45, 9604-9610).

[0217] Solutions of cis-cyclooctene (COE), 3-ethyl-COE, and α-bromoisobutyrate functionalized cis-cyclooctene (BrICOE) were used in CHCl 3 Monomer mixture (1M) in . The monomer solution was degassed by three cycles of freeze-pump thaw, and the 0.2 mL dry CHCl 3 (1,3-bis(2,4,6-trimethylphenyl)-2-imidazolidinylidene)dichloro(phenylmethylene)(tricyclohexylphosphine)ruthenium (Grabardy The solution of the second generation catalyst, G2) was transferred to the reaction flask. A suitable amount of cis-4-octene as chain transfer ag...

Embodiment 2

[0239] Example 2: Thickening efficiency of graft copolymers P1-P3

[0240] The graft copolymers P1-P3 listed in Table 2 were dissolved in group (III) base oil by stirring overnight at 90°C 3043 in. The resulting lubricant composition was heated between 0 and 140°C at intervals of 20°C, and the kinematic viscosity was measured.

[0241] Relative thickening contribution (RTC) is a measure of the performance of:

[0242] · VI performance of the polymer, which is independent of viscosity and base oil

[0243] • Thickening efficiency for a particular base oil solvency independent of base oil viscosity.

[0244] The RTC is calculated according to the following relationship:

[0245]

[0246] where η is the measured kinematic viscosity; and

[0247] % polymer is the amount of dissolved graft copolymer expressed in weight % based on the total weight of the lubricant composition.

[0248] figure 1 The RTCs of the copolymers P1-P3 at different temperatures are shown in .

[...

Embodiment 3

[0276] Embodiment 3: the mensuration of high temperature high shear (HTHS) viscosity

[0277] Dissolve graft copolymer P3 in group (III) base oil by stirring overnight at 90°C 3043 in. The viscosity of the lubricant composition comprising 5% by weight of P3 was measured as a function of shear rate at 40 and 100°C.

[0278] The corresponding result is given by Image 6 Exemplary instructions.

[0279] Image 6 It is shown that the non-linear part of the graph at high shear rates accounts for the non-Newtonian nature of the system. This temporary loss of viscosity is attributed to the departure of the polymer chains from the random coil conformation, and the partial loss of chain entanglement at high shear rates. This behavior is fully reversible when the force is removed and the polymer chains return to their random conformation.

[0280] This result confirms the excellent shear stability of the inventive graft copolymer P3.

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Abstract

The present invention relates to a graft copolymer comprising in the backbone at least one segment having repeating units obtainable by ring-opening metathesis polymerization (ROMP) of an optionally substituted cycloalkene and at least one segment comprising repeating units obtainable by atom transfer radical polymerization (ATRP) of a (meth)acrylate. The corresponding graft copolymer is highly suitable for use as an oil additive in internal combustion engines, in particular, in combustion engines which are operated for longer periods of time at substantially constant operating temperatures.

Description

technical field [0001] The present application relates to oil-soluble graft copolymers, their preparation and use as viscosity index improvers. Background technique [0002] Poly(alkyl(meth)acrylates) (PAMAs), generally synthesized by simple free-radical copolymerization of mixtures of different alkyl methacrylates (AMAs), are commonly used as oil additives. Depending on their molecular weight and composition, their use allows an increase in the viscosity index (VI) (see R.M.Mortier, S.T. Orszulik (ed.), Chemistry and Technology of Lubricants, Blackie Academic & Professional, 1st edition, London 1993, 124-159 and 165 -167). The VI of PAMA-treated lubricants can often be increased by copolymerizing short-chain alkyl (meth)acrylates such as methyl methacrylate or butyl methacrylate (See EP0637332, EP0937769 or EP0979834). However, the presence of short-chain components generally reduces polymer solubility in oil at low temperatures, so the content of methyl methacrylate in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/14C08F293/00C08G61/08C08F8/04C10M159/00
CPCC08F8/04C08F283/14C08G61/08C08F293/005C10M159/005C08F2438/01C08G2261/3322C08G2261/418C08G2261/74C10M2203/1025C10M2205/022C10M2205/10C10M2209/084C08G2261/136C10M145/14C10N2020/04C10N2030/02C10N2030/68C10N2040/25C08F220/1804C08F220/1812C10M2205/024C10N2020/02C08F220/68C08F255/08C08F277/00C10M169/041C10M2203/003
Inventor K·施莫塞克K·舒勒M·T·萨沃吉M·A·希尔梅耶T·P·络基
Owner EVONIK OPERATIONS GMBH
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