CN105131167A - Alkylaromatic hydrocarbon substituted ethylene monomer-containing oil-soluble polymer viscosity reducer and microwave preparation method thereof - Google Patents
Alkylaromatic hydrocarbon substituted ethylene monomer-containing oil-soluble polymer viscosity reducer and microwave preparation method thereof Download PDFInfo
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Abstract
The invention relates to an oil-soluble polymer viscosity reducer for reducing the viscosity of heavy oil, and a microwave synthesis method thereof. The oil-soluble viscosity reducer for the heavy oil is obtained through the following steps: synthesizing alkylaromatic hydrocarbon substituted ethylene containing different carbon chain lengths and aryl groups with alkylaromatic hydrocarbon substituted ethylene as a basic construction unit, and polymerizing alkylaromatic hydrocarbon substituted ethylene, octadecyl acrylate, maleic anhydride and acrylic acid monomers. The introduction of the aryl groups to the alkylaromatic hydrocarbon substituted ethylene monomer contained in the polymer improves the cooperative viscosity reduction effect of the heavy oil and realizes large innovation. Microwaves are used to heat the internal of molecules in order to rapidly heat reactants, so a polymerization reaction is fast, and the prepared viscosity reducer has the characteristics of good distribution of high molecular weight, and very good viscosity reduction effect on super heavy oil.
Description
Technical field
The present invention relates to oil-soluble viscosity reducer, the viscosity reduction of and viscous oil recovery defeated for crude oil pipe, be particularly useful for a kind of oil-soluble viscosity reducer of the defeated and exploitation of viscous crude pipe.
Background technology
Along with petroleum demand amount is increasing, high-quality crude has been not enough to meet human wants, and along with the progressively increasing of oil extraction, the viscous crude of institute's extraction also gets more and more, and the application problem of viscous crude is also just put before eyes.Because viscous crude is rich in a large amount of colloids, bituminous matter and solid hydrocarbons, and the molecular weight of resin and asphalt is large and polarity is very strong, intermolecular easy formation hydrogen bond, make between molecule, there is very strong force of cohesion, cause viscous crude when flowing due to larger internal friction, make it when temperature is lower, cannot flow.This series of reason, causes the features such as viscous crude density is large, viscosity is high, poor fluidity, thus causes the difficulty of exploitation and transport viscous crude.
The method of existing reduction viscosity of thickened oil has heating, viscosity reducing, reducing viscosity by emulsifying and interpolation viscosity-depression agent viscosity reduction etc.Heating, viscosity reducing technology relative maturity, but it is excessive to consume energy, high cost, economical not; Reducing viscosity by emulsifying cost is lower, and effect is relatively better, but in use there are some problems, as viscosity reduction oil dehydration difficulty and oily water treatment problem.And add oil-soluble viscosity reducer viscosity reduction, both can reduce viscosity of thickened oil, cost is also relatively low, and there is not a sewage disposal difficult problem, is the best viscosity reducing process of development prospect.
In sum, for the various features of viscous crude, research oil-soluble viscosity reducer composition is on the impact of viscosity reducing effect and develop efficient oil-soluble viscosity reducer and have very Dali and to touch upon economic implications, is also the important channel solving the problem that viscous crude runs in exploitation with transportation.
Patent CN201410482839.3 discloses a kind of viscosity-depression agent containing tetrafluoroethylene and preparation method thereof, by polytetrafluorethylepowder powder and other each components rationally composite, the viscosity-depression agent that obtained a kind of viscosity reducing effect is good, it is 9.6% to the viscosity break ratio of viscous crude, but viscosity reduction efficiency is lower.Patent CN201410798675.5 has invented a kind of dendritic oil-soluble viscosity reducer for reducing thick oil viscosity in viscous oil recovery process.Viscosity-depression agent is made up of diethanolamine, propylene oxide, stearoyl chlorine and solvent toluene, and raw materials used and molar percentage is: diethanolamine 20% ~ 60%; Epoxy chloropropane 20% ~ 60%; Stearoyl chlorine 20% ~ 60%.Patent CN201010123653.0 has invented the terpolymer oil soluble viscosity reducer and preparation method thereof for viscous oil recovery and conveying.For the terpolymer oil soluble viscosity reducer of viscous oil recovery and conveying, it is characterized in that it is obtained by higher hydrocarbyl acrylate, N, N '-two (methacryloyl) diamines, vinylbenzene, azo diethyl butyronitrile and toluene.Patent CN201410613368.5 discloses a kind of multipolymer containing (methyl) vinylformic acid alkyl aryl.Comonomer is (methyl) vinylformic acid alkyl aryl, and other comonomer is selected from one or more in vinylbenzene, acrylamide, maleic anhydride, vinyl acetate, alpha-olefin, MALEIC ANHYDRIDE, fumaric acid.By combination and the polymerizing condition of different comonomers, obtain tandem product.Containing the multipolymer of (methyl) vinylformic acid alkyl aryl, use as pour point depressant, viscosity-depression agent or fluidity improver.As can be seen from above patent, the monomer selection of viscosity-depression agent can have a variety of, and polymerization obtains polymkeric substance miscellaneous thus, but does not have the special highly effective viscosity-reducing agent for reducing thick oil viscosity.Alkylaromatic hydrocarbon substituted ethylene monomer, for a reducing thick oil viscosity difficult problem, is incorporated in viscosity-depression agent molecule by this patent, develops efficient oil soluble heavy crude thinner.
Summary of the invention
The object of this invention is to provide a kind of oil-soluble polymers viscosity-depression agent for viscous crude or super-viscous oil and synthetic method thereof, alkylaryl monomer is introduced in polymer molecular structure, to increase the reactive force of viscosity-depression agent to bituminous matter lamella, weaken the strong sintering action between asphaltene molecules, reach the object of viscosity reduction.For increasing the effect of aromatic units in viscosity-depression agent molecule, the invention provides the technical scheme of following characteristics.
Polymkeric substance provided by the invention is a kind of is the multipolymer of monomer containing alkylaromatic hydrocarbon substituted ethylene, it is characterized in that, a kind of monomer of polymkeric substance is alkylaromatic hydrocarbon substituted ethylene (monomer 1), other monomer (monomer 2) is selected from octadecyl acrylate, one or more in acrylamide, maleic anhydride, vinylformic acid, obtain binary polymer, ter-polymers and multipolymer thus.The general structure of alkylaromatic hydrocarbon substituted ethylene monomer is:
Described alkylaromatic hydrocarbon substituted ethylene monomer has following structure:
Wherein: m is 0,1,2,3 positive integers;
N is 0,1,2,3 positive integers;
R2 is H, C1 ~ C6 alkyl;
R3 is H, C1 ~ C6 alkyl;
R4 replaces or phenyl that end replaces, tolyl, m-xylene base, p-Xylol base, o-Xylol base, ethylbenzene, n-propyl phenyl, isopropyl phenyl, n-butylphenyl, tert-butyl-phenyl, xenyl, one in phenylol.
The typical synthesis step of this multipolymer is as follows:
(1) monomer 1 and the calculation of monomer 2 pro rata are carried out binary, ternary or multiple aggregation, after precise, add in quartzy microwave reaction pipe, add reaction solvent, reactant is fully stirred, and reactant is all dissolved in solvent.
(2) add initiator in proportion, nitrogen is purged to reactor, closed reactor.Be warmed up to 80 ~ 150 DEG C, reaction 0.5 ~ 2h.
(3) after reaction terminates, after cooling, under rapid stirring, with dropper, reaction product is slowly instilled in a large amount of solvent, and rinse reactor with a small amount of reaction solvent, residual product is all moved in a large amount of methyl alcohol, stir 2h, polymkeric substance is all separated out.
(4), after stirring terminates, carry out suction filtration with Büchner funnel, dry, weigh, obtain polymkeric substance.
(5) by viscosity-depression agent with to be dissolved in certain solvent obtained oil-soluble viscosity reducer.
Described in synthesis step (1), monomer 1 is alkylaromatic hydrocarbon substituted ethylene monomer.
Described in synthesis step (1), monomer 2 is octadecyl acrylate, one or more in acrylamide, maleic anhydride, vinylformic acid.
Described monomer ratio is as follows:
Copolymer described in synthesis step (1), the component of two kinds of monomer copolymers and weight proportion are, alkylaromatic hydrocarbon substituted ethylene: octadecyl acrylate=3:1 ~ 1:9, alkylaromatic hydrocarbon substituted ethylene: acrylamide=4:1 ~ 1:3, or alkylaromatic hydrocarbon substituted ethylene: maleic anhydride=6:1 ~ 3:2; Or alkylaromatic hydrocarbon substituted ethylene: vinylformic acid=5:1 ~ 1:2.
Terpolymer described in synthesis step (1), the component of three kinds of monomer copolymers and weight proportion be, alkylaromatic hydrocarbon substituted ethylene: octadecyl acrylate: acrylamide or maleic anhydride or vinylformic acid=9:1 ~ 9:1 ~ 9.
Multiple copolymer described in synthesis step (1), the component of four kinds of monomer copolymers and weight proportion be, alkylaromatic hydrocarbon substituted ethylene: octadecyl acrylate: maleic anhydride: acrylamide=9:1 ~ 9:1 ~ 9:1 ~ 9.
Described in synthesis step (2), initiator is selected from the one in benzoyl peroxide, Diisopropyl azodicarboxylate or isopropyl benzene hydroperoxide, and the consumption of described initiator is 0.5 ~ 3.5% of total monomer weight.
Reaction solvent described in synthesis step (1) is aromatic hydrocarbons organic solvent, comprises the one in toluene, ethylbenzene, dimethylbenzene, chlorobenzene or several mixing.
Described in synthesis step (5), solvent is aromatic hydrocarbons organic solvent, comprises the one in toluene, benzene, ethylbenzene, dimethylbenzene, chlorobenzene, dichlorobenzene or several mixing.
Compared with prior art, tool of the present invention has the following advantages:
Containing alkylaromatic hydrocarbon substituted ethylene monomer in this viscosity-depression agent, the polymkeric substance containing this monomer plays the wax be dissolved in viscous crude and prevents from making that wax-crystal structure is loose prevents it from condensing; Aromatic moiety has good dissemination to colloid, bituminous matter component and prevents segregation.And alkyl chain part can increase the solubleness of viscosity-depression agent in viscous crude, ester group in viscosity-depression agent, amide group can increase the composition of the polar group of viscosity-depression agent, increase the interaction force between the polar compound in the polar compound of viscosity-depression agent and viscous crude, each component is mutually collaborative makes viscosity-depression agent can be used in full-bodied heavy crude well and heavy oil transportation process, and has good effect.In heavy crude well or Cemented filling, it plays viscosity reduction effect to viscous crude.
Comparative examples of the present invention is described further.
The oil-soluble viscosity reducer of design and evaluation of the present invention has viscous crude or super-viscous oil and significantly falls low viscous effect, makes viscous crude structure become loose convenient exploitation, also effectively improves pipe delivery of energy effect and operating safety simultaneously; Its feature is to have obvious viscosity reduction effect for viscous crude or super-viscous oil, can solve the difficult problem that current viscous crude and super heavy oil recovery and carrying cost are high, show technical progress.
Accompanying drawing illustrates:
Fig. 1 is that the obtained viscosity-depression agent of embodiment 1-5 is to Shengli Oil Field block A reducing thick oil viscosity effect assessment.
Fig. 2 is that the obtained viscosity-depression agent of embodiment 1-5 is to Shengli Oil Field block B reducing thick oil viscosity effect assessment.
Embodiment
In order to understand the present invention better, illustrate content of the present invention further below in conjunction with example, but content of the present invention is not only confined to the following examples.
Embodiment 1
(1) monomer 1 and the calculation of monomer 2 pro rata are carried out Binary Aggregation, after precise, add in quartzy microwave reaction pipe, add reaction solvent, reactant is fully stirred, and reactant is all dissolved in solvent.
(2) add initiator in proportion, nitrogen is purged to reactor, closed reactor.Be warmed up to 90 DEG C, reaction 1.0h.
(3) after reaction terminates, after cooling, under rapid stirring, with dropper, reaction product is slowly instilled in a large amount of solvent, and rinse reactor with a small amount of reaction solvent, residual product is all moved in a large amount of methyl alcohol, stir 2h, polymkeric substance is all separated out.
(4), after stirring terminates, carry out suction filtration with Büchner funnel, dry, weigh, obtain polymkeric substance.
(5) by viscosity-depression agent with to be dissolved in certain solvent obtained oil-soluble viscosity reducer.
Described in synthesis step (1), monomer 1 is phenylpropen.Wherein: m is 0; N is 0; R2 is H; R3 is H; R4 is phenyl.
Described in synthesis step (1), monomer 2 is octadecyl acrylate.
Described monomer ratio is as follows:
Copolymer described in synthesis step (1), the component of two kinds of monomer copolymers and weight proportion be, alkylaromatic hydrocarbon substituted ethylene: octadecyl acrylate=2:1.
Described in synthesis step (2), initiator is selected from the one in benzoyl peroxide, Diisopropyl azodicarboxylate or isopropyl benzene hydroperoxide, and the consumption of described initiator is 1.0% of total monomer weight.
Reaction solvent described in synthesis step (1) is toluene.
Described in synthesis step (5), solvent is toluene.
Embodiment 2
(1) monomer 1 and the calculation of monomer 2 pro rata are carried out Binary Aggregation, after precise, add in quartzy microwave reaction pipe, add reaction solvent, reactant is fully stirred, and reactant is all dissolved in solvent.
(2) add initiator in proportion, nitrogen is purged to reactor, closed reactor.Be warmed up to 120 DEG C, reaction 1.5h.
(3) after reaction terminates, after cooling, under rapid stirring, with dropper, reaction product is slowly instilled in a large amount of solvent, and rinse reactor with a small amount of reaction solvent, residual product is all moved in a large amount of methyl alcohol, stir 2h, polymkeric substance is all separated out.
(4), after stirring terminates, carry out suction filtration with Büchner funnel, dry, weigh, obtain polymkeric substance.
(5) by viscosity-depression agent with to be dissolved in certain solvent obtained oil-soluble viscosity reducer.
Described in synthesis step (1), monomer 1 is tolyl hexene monomers.Wherein: m is 3; N is 1; R2 is H; R3 is H; R4 is p-methylphenyl.
Described in synthesis step (1), monomer 2 is acrylamide.
Described monomer ratio is as follows:
Copolymer described in synthesis step (1), the component of two kinds of monomer copolymers and weight proportion be, alkylaromatic hydrocarbon substituted ethylene: acrylamide=3:1.
Described in synthesis step (2), initiator is selected from the one in benzoyl peroxide, Diisopropyl azodicarboxylate or isopropyl benzene hydroperoxide, and the consumption of described initiator is 0.5% of total monomer weight.
Reaction solvent described in synthesis step (1) is aromatic hydrocarbons organic solvent is ethylbenzene.
Solvent described in synthesis step (5) is that toluene and ethylbenzene 1:1 mix.
Embodiment 3
(1) monomer 1 and the calculation of monomer 2 pro rata are carried out Binary Aggregation, after precise, add in quartzy microwave reaction pipe, add reaction solvent, reactant is fully stirred, and reactant is all dissolved in solvent.
(2) add initiator in proportion, nitrogen is purged to reactor, closed reactor.Be warmed up to 90 DEG C, reaction 1.0h.
(3) after reaction terminates, after cooling, under rapid stirring, with dropper, reaction product is slowly instilled in a large amount of solvent, and rinse reactor with a small amount of reaction solvent, residual product is all moved in a large amount of methyl alcohol, stir 2h, polymkeric substance is all separated out.
(4), after stirring terminates, carry out suction filtration with Büchner funnel, dry, weigh, obtain polymkeric substance.
(5) by viscosity-depression agent with to be dissolved in certain solvent obtained oil-soluble viscosity reducer.
Described in synthesis step (1), monomer 1 is isopropyl phenyl hexene monomers, wherein: m is 0; N is 0; R2 is n-propyl; R3 is H; R4 is isopropyl phenyl.
Described in synthesis step (1), monomer 2 is octadecyl acrylate.
Described monomer ratio is as follows:
Copolymer described in synthesis step (1), the component of two kinds of monomer copolymers and weight proportion be, alkylaromatic hydrocarbon substituted ethylene: octadecyl acrylate=2:1.
Described in synthesis step (2), initiator is selected from the one in benzoyl peroxide, Diisopropyl azodicarboxylate or isopropyl benzene hydroperoxide, and the consumption of described initiator is 1.0% of total monomer weight.
Reaction solvent described in synthesis step (1) is chlorobenzene.
Solvent described in synthesis step (5) is that toluene and chlorobenzene 1:1 mix.
Embodiment 4
(1) monomer 1 and the calculation of monomer 2 pro rata are carried out binary polymerization, after precise, add in quartzy microwave reaction pipe, add reaction solvent, reactant is fully stirred, and reactant is all dissolved in solvent.
(2) add initiator in proportion, nitrogen is purged to reactor, closed reactor.Be warmed up to 90 DEG C, reaction 1.0h.
(3) after reaction terminates, after cooling, under rapid stirring, with dropper, reaction product is slowly instilled in a large amount of solvent, and rinse reactor with a small amount of reaction solvent, residual product is all moved in a large amount of methyl alcohol, stir 2h, polymkeric substance is all separated out.
(4), after stirring terminates, carry out suction filtration with Büchner funnel, dry, weigh, obtain polymkeric substance.
(5) by viscosity-depression agent with to be dissolved in certain solvent obtained oil-soluble viscosity reducer.
Described in synthesis step (1), monomer 1 is para hydroxybenzene propylene, wherein: m is 0; N is 0; R2 is H; R3 is H; R4 is Pyrogentisinic Acid's base.
Described in synthesis step (1), monomer 2 is octadecyl acrylate, acrylamide, maleic anhydride.
Described monomer ratio is as follows:
Terpolymer described in synthesis step (1), the component of three kinds of monomer copolymers and weight proportion be, alkylaromatic hydrocarbon substituted ethylene: octadecyl acrylate: vinylformic acid=9:9:3.
Described in synthesis step (2), initiator is selected from the one in benzoyl peroxide, Diisopropyl azodicarboxylate or isopropyl benzene hydroperoxide, and the consumption of described initiator is 1.8% of total monomer weight.
Reaction solvent described in synthesis step (1) is that toluene and chlorobenzene 1:1 mix.
Described in synthesis step (5), solvent is toluene.
Embodiment 5
(1) monomer 1 and the calculation of monomer 2 pro rata are carried out multiple aggregation, after precise, add in quartzy microwave reaction pipe, add reaction solvent, reactant is fully stirred, and reactant is all dissolved in solvent.
(2) add initiator in proportion, nitrogen is purged to reactor, closed reactor.Be warmed up to 90 DEG C, reaction 1.0h.
(3) after reaction terminates, after cooling, under rapid stirring, with dropper, reaction product is slowly instilled in a large amount of solvent, and rinse reactor with a small amount of reaction solvent, residual product is all moved in a large amount of methyl alcohol, stir 2h, polymkeric substance is all separated out.
(4), after stirring terminates, carry out suction filtration with Büchner funnel, dry, weigh, obtain polymkeric substance.
(5) by viscosity-depression agent with to be dissolved in certain solvent obtained oil-soluble viscosity reducer.
Monomer 1 described in synthesis step (1) is to trimethylphenylmethane base ethyl hexene, wherein: m is 1; N is 2; R2 is H; R3 is ethyl; R4 is to trimethylphenylmethane base.
Described in synthesis step (1), monomer 2 is octadecyl acrylate, acrylamide, maleic anhydride.
Described monomer ratio is as follows:
Multiple copolymer described in synthesis step (1), the component of four kinds of monomer copolymers and weight proportion be, alkylaromatic hydrocarbon substituted ethylene: octadecyl acrylate: maleic anhydride: acrylamide=9:9:3:3.
Described in synthesis step (2), initiator is selected from the one in benzoyl peroxide, Diisopropyl azodicarboxylate or isopropyl benzene hydroperoxide, and the consumption of described initiator is 1.0% of total monomer weight.
Reaction solvent described in synthesis step (1) is toluene.
Described in synthesis step (5), solvent is dichlorobenzene.
Above embodiment is applied in two routine reducing thick oil viscosities, the viscosity reducing effect of viscosity-depression agent is evaluated.
Application examples 1
The viscosity-depression agent that embodiment 1-5 is obtained is applied in Shengli Oil Field block A viscous crude, carries out evaluation test to viscosity-depression agent performance.
The mensuration of the viscosity reducing effect of viscous crude sample:
Getting two parts of viscosity is that the Shengli Oil Field block A viscous crude 27g of 12000mPa.s (50 DEG C) is as evaluation oil, mix the viscosity-depression agent (polymer content of viscosity-depression agent is 500 μ g/g) of kerosene 3g and the above-mentioned configuration of kerosene 2.8g+0.2g respectively, be uniformly mixed at 50 DEG C, measure the viscosity of two oil samples at 50 DEG C respectively, and calculate viscosity break ratio.Experimental result is shown in Fig. 1, the wherein viscosity-depression agent of viscosity-depression agent 1 prepared by embodiment 1, the viscosity-depression agent of viscosity-depression agent 2 prepared by embodiment 2, the viscosity-depression agent of viscosity-depression agent 3 prepared by embodiment 3, the viscosity-depression agent of viscosity-depression agent 4 prepared by embodiment 4, the viscosity-depression agent of viscosity-depression agent 5 prepared by embodiment 5.
Application examples 2
The viscosity-depression agent that embodiment 1-5 is obtained is applied in Shengli Oil Field block A viscous crude, carries out evaluation test to viscosity-depression agent performance.
The mensuration of the viscosity reducing effect of viscous crude sample:
Getting two parts of viscosity is that the Shengli Oil Field block A viscous crude 27g of 12000mPa.s (50 DEG C) is as evaluation oil, mix the viscosity-depression agent (polymer content of viscosity-depression agent is 500 μ g/g) of kerosene 3g and the above-mentioned configuration of kerosene 2.8g+0.2g respectively, be uniformly mixed at 50 DEG C, measure the viscosity of two oil samples at 50 DEG C respectively, and calculate viscosity break ratio.Experimental result is shown in Fig. 1, the wherein viscosity-depression agent of viscosity-depression agent 1 prepared by embodiment 1, the viscosity-depression agent of viscosity-depression agent 2 prepared by embodiment 2, the viscosity-depression agent of viscosity-depression agent 3 prepared by embodiment 3, the viscosity-depression agent of viscosity-depression agent 4 prepared by embodiment 4, the viscosity-depression agent of viscosity-depression agent 5 prepared by embodiment 5.
Obviously, above-described embodiment is only for clearly example being described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And thus the apparent change of extending out or variation be still among the protection domain of the invention.
Claims (7)
1. a class is used for the oil-soluble viscosity reducer of reducing thick oil viscosity, it is characterized in that such viscosity-depression agent is the multipolymer containing alkylaromatic hydrocarbon substituted ethylene unit, a monomer of polyreaction is alkylaromatic hydrocarbon substituted ethylene, other monomer is selected from octadecyl acrylate, one or more in acrylamide, maleic anhydride, vinylformic acid, obtain binary polymer, ter-polymers and multipolymer thus, described alkylaromatic hydrocarbon substituted ethylene monomer has following structure:
Wherein: m is 0,1,2,3 positive integers;
N is 0,1,2,3 positive integers;
R2 is H, C1 ~ C6 alkyl;
R3 is H, C1 ~ C6 alkyl;
R4 replaces or phenyl that end replaces, tolyl, m-xylene base, p-Xylol base, o-Xylol base, ethylbenzene, n-propyl phenyl, isopropyl phenyl, n-butylphenyl, tert-butyl-phenyl, xenyl, one in phenylol.
2. copolymer according to claim 1, it is characterized in that component and the weight proportion of described two kinds of monomer copolymers are, alkylaromatic hydrocarbon substituted ethylene: octadecyl acrylate=3:1 ~ 1:9, or alkylaromatic hydrocarbon substituted ethylene: acrylamide=4:1 ~ 1:3, or alkylaromatic hydrocarbon substituted ethylene: maleic anhydride=6:1 ~ 3:2; Or alkylaromatic hydrocarbon substituted ethylene: vinylformic acid=5:1 ~ 1:2.
3. terpolymer according to claim 1, it is characterized in that described three kinds of monomer copolymers component and weight proportion be, alkylaromatic hydrocarbon substituted ethylene: octadecyl acrylate: acrylamide or maleic anhydride or vinylformic acid=9:1 ~ 9:1 ~ 9.
4. multiple copolymer according to claim 1, is characterized in that the component of described four kinds of monomer copolymers and weight proportion are, alkylaromatic hydrocarbon substituted ethylene: octadecyl acrylate: maleic anhydride: acrylamide=9:1 ~ 9:1 ~ 9:1 ~ 9.
5. the preparation method of multipolymer according to claim 1, two or more polymerization single polymerization monomer and reaction solvent is it is characterized in that to join in microwave reaction pipe, add initiator, purge nitrogen, be warmed up to 50 ~ 150 DEG C, reaction 0.5 ~ 2h, after reaction terminates, purifying in methyl alcohol, suction filtration, dry in loft drier, multipolymer is dissolved into preparation in certain solvent and obtains oil soluble heavy crude thinner, described reaction solvent is aromatic hydrocarbons organic solvent, comprises the one in toluene, ethylbenzene, dimethylbenzene, chlorobenzene or several mixing.
6. the preparation method of multipolymer according to claim 5, is characterized in that described initiator is selected from the one in benzoyl peroxide, Diisopropyl azodicarboxylate or isopropyl benzene hydroperoxide, and the consumption of described initiator is 0.5% ~ 3.5% of monomer total mass.
7. the preparation method of multipolymer according to claim 5, it is characterized in that, multipolymer is dissolved into preparation in certain solvent and obtains oil soluble heavy crude thinner, described solvent is aromatic hydrocarbons organic solvent, comprises the one in toluene, benzene, ethylbenzene, dimethylbenzene, chlorobenzene, dichlorobenzene or several mixing.
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