POLYMER HAVING DISPERSING FUNCTION, OIL WELL CEMENT DISPERSANT, AND PREPARATION METHOD THEREFOR AND USE THEREOF

Abstract

A polymer having a dispersing function, a preparation method therefor, and a use thereof as a cement dispersant are provided. The polymer has a structural unit a, a structural unit b, a structural unit c and a structural unit d. The structural unit a is provided by an unsaturated polyether and/or polyester, the structural unit b is provided by an unsaturated carboxylic acid or an anhydride or salt thereof, the structural unit c is provided by a silane and/or siloxane containing a polymerizable group, and the structural unit d is provided by an unsaturated sulfonic acid or a salt thereof. The molar ratio of the structural unit a to the structural unit d is 1:(5-15) and the polymer has a weight average molecular weight of 20,000 to 120,000. The polymer can be used as an oil well cement dispersant.

Claims

1-16. (canceled)

17. A polymer having a dispersing function, characterized in that the polymer comprises a structural unit a, a structural unit b, a structural unit c and a structural unit d; wherein the structural unit a is provided by an unsaturated polyether and/or polyester, the structural unit b is provided by an unsaturated carboxylic acid or an anhydride or salt thereof, the structural unit c is provided by a silane and/or siloxane containing a polymerizable group, and the structural unit d is provided by an unsaturated sulfonic acid or a salt thereof; the molar ratio of the structural unit a to the structural unit d is 1:(5-15); the polymer has a weight average molecular weight of 20,000-120,000.

18. The polymer of claim 17, wherein the molar ratio of the structural unit a to the structural unit d is 1:(6-10).

19. The polymer of claim 17, wherein the molar ratio of the structural unit a:the structural unit b:the structural unit c is 1:(0.5-6):(0.01-4).

20. The polymer of claim 17, wherein the unsaturated polyester has a structure represented by formula (I): ##STR00007## in formula (I), A denotes an alkylene having 2-4 carbon atoms; B denotes an alkylene having 2-4 carbon atoms and different from A; R.sup.1 and R.sup.2 each independently represents H or an alkyl having 1-5 carbon atoms; R.sup.3 denotes an alkyl having 1-4 carbon atoms; X denotes an alkylene having 1-5 carbon atoms; m represents an integer from 0 to 200; n represents an integer from 0 to 200; m+n>10; the unsaturated polyether has a structure represented by formula (II): ##STR00008## in formula (II), E denotes an alkylene having 2-4 carbon atoms; F denotes an alkylene having 2-4 carbon atoms and different from E; R.sup.4 and R.sup.5 each independently represents H or an alkyl having 1-5 carbon atoms; R.sup.6 denotes an alkyl having 1-4 carbon atoms; Y denotes an alkylene having 1-5 carbon atoms; p represents an integer from 0 to 200; q represents an integer from 0 to 200; p+q>10.

21. The polymer of claim 17, wherein the unsaturated carboxylic acid includes, but is not limited to, one or more selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid, fumaric acid and maleic acid.

22. The polymer of claim 17, wherein the unsaturated sulfonic acid or salt thereof contains a substituted or unsubstituted benzene ring or amide group.

23. The polymer of claim 17, wherein the unsaturated sulfonic acid and/or salt thereof includes, but is not limited to having a structure represented by any one of formula (IIIA)-formula (IIID): ##STR00009## in formula IIIA, formula IIIB and formula IIIC, R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are each independently selected from hydrogen, halogen, C1-C6 alkyl and C1-C6 alkoxyl, X is (CH.sub.2).sub.n, n is an integer from 0 to 6, and M is hydrogen or a metal ion, such as an alkali metal ion; in formula IIID, R.sub.1, R.sub.2 and R.sub.3 are each independently selected from hydrogen and C1-C6 alkyl, X is (CH.sub.2).sub.n, n is an integer from 0 to 6, and M is hydrogen or a metal ion, such as an alkali metal ion; and/or, the unsaturated sulfonic acid or salt thereof is one or more selected from the group consisting of 2-acrylamide-2-methyl propane sulfonic acid, 2-acrylamido-2-methyl propanesulfonate, p-styrene sulfonic acid, p-styrene sulfonate, methyl p-styrene sulfonic acid, methyl p-styrene sulfonate, allyl sulfonic acid and allyl sulfonate.

24. The polymer of claim 17, wherein the silane and/or siloxane containing a polymerizable group has not less than 5 carbon atoms, the polymerizable group is one or more selected from the group consisting of carbon-carbon double bonds, carbon-carbon triple bonds and epoxy groups; and/or, the silane coupling agent has a structure represented by formula (IV): ##STR00010## In formula (IV), each of R.sub.1, R.sub.2, R.sub.3, R.sub.1′ and R.sub.2′ is independently selected from H and C1-C4 alkyl; R.sub.a, R.sub.b and R.sub.c are each independently selected from H and C1-C4 alkyl or alkoxyl, and n is an integer from 5 to 25.

25. The polymer of claim 24, wherein the silane and/or siloxane is at least one selected from the group consisting of 7-octenyl trimethoxysilane, vinyl octadecyl trimethoxysilane, vinyl hexadecyl trimethoxysilane and vinyl dodecyl trimethoxysilane.

26. A method for preparing a dispersant, the method comprises: subjecting a monomer mixture to polymerization in water under the solution polymerization conditions in the presence of an initiator, wherein the monomer mixture comprises a monomer A, a monomer B, a monomer C and a monomer D, a monomer A being an unsaturated polyether and/or polyester, a monomer B being an unsaturated carboxylic acid and/or anhydride and/or salt thereof, a monomer C being a silane and/or siloxane containing a polymerizable group, and a monomer D being an unsaturated sulfonic acid and/or a salt thereof; and the molar ratio of monomer A:monomer B:monomerC:monomer D is 1:(0.5-6):(0.01-4):(5-15), the polymerization conditions cause that the polymer has a weight average molecular weight of 20,000-120,000.

27. The method of claim 26, wherein the unsaturated polyester has a structure represented by formula (I): ##STR00011## in formula (I), A denotes an alkylene having 2-4 carbon atoms; B denotes an alkylene having 2-4 carbon atoms and different from A; R.sup.1 and R.sup.2 each independently represents H or an alkyl having 1-5 carbon atoms; R.sup.3 denotes an alkyl having 1-4 carbon atoms; X denotes an alkylene having 1-5 carbon atoms; m represents an integer from 0 to 200; n represents an integer from 0 to 200; m+n>10; the unsaturated polyether has a structure represented by formula (II): ##STR00012## in formula (II), E denotes an alkylene having 2-4 carbon atoms; F denotes an alkylene having 2-4 carbon atoms and different from E; R.sup.4 and R.sup.5 each independently represents H or an alkyl having 1-5 carbon atoms; R.sup.6 denotes an alkyl having 1-4 carbon atoms; Y denotes an alkylene having 1-5 carbon atoms; p represents an integer from 0 to 200; q represents an integer from 0 to 200; p+q>10; and/or, the unsaturated carboxylic acid includes, but is not limited to, one or more selected from the group consisting of acrylic acid, methacrylic acid, itaconic acid, fumaric acid and maleic acid.

28. The method of claim 26, wherein the unsaturated sulfonic acid or salt thereof contains a substituted or unsubstituted benzene ring or amide group.

29. The method of claim 28, wherein the unsaturated sulfonic acid and/or salt thereof includes, but is not limited to having a structure represented by any one of formula (IIIA)-formula (IIID): ##STR00013## in formula IIIA, formula IIIB and formula IIIC, R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are each independently selected from hydrogen, halogen, C1-C6 alkyl and C1-C6 alkoxyl, X is (CH.sub.2).sub.n, n is an integer from 0 to 6, and M is hydrogen or a metal ion, such as an alkali metal ion; in formula IIID, R.sub.1, R.sub.2 and R.sub.3 are each independently selected from hydrogen and C1-C6 alkyl, X is (CH.sub.2).sub.n, n is an integer from 0 to 6, and M is hydrogen or a metal ion, such as an alkali metal ion; and/or, the unsaturated sulfonic acid or salt thereof is one or more selected from the group consisting of 2-acrylamide-2-methyl propane sulfonic acid, 2-acrylamido-2-methyl propanesulfonate, p-styrene sulfonic acid, p-styrene sulfonate, allyl sulfonic acid and allyl sulfonate.

30. The method of claim 26, wherein the silane and/or siloxane containing a polymerizable group has not less than 5 carbon atoms, the polymerizable group is one or more selected from the group consisting of carbon-carbon double bonds, carbon-carbon triple bonds and epoxy groups; and/or, the silane coupling agent has a structure represented by formula (IV): ##STR00014## in formula (IV), each of R.sub.1, R.sub.2, R.sub.3, R.sub.1′ and R.sub.2′ is independently selected from H and C1-C4 alkyl; R.sub.a, R.sub.b and R.sub.c are each independently selected from H and C1-C4 alkyl or alkoxyl, and n is an integer from 5 to 25.

31. The method of claim 30, wherein the silane and/or siloxane is at least one selected from the group consisting of 7-octenyl trimethoxysilane, vinyl octadecyl trimethoxysilane, vinyl hexadecyl trimethoxysilane and vinyl dodecyl trimethoxysilane.

32. The method of claim 26, wherein said polymerization reaction is carried out in the presence of a chain transfer agent, the conditions of polymerization reaction comprises: a temperature of 50-80° C., and a time of 2-10 hours.

33. A cement composition comprising cement and the polymer of claim 17 as a dispersant.

34. The cement composition of claim 33, wherein it is that the dispersant is used in an amount of 0.05-5 wt %, based on the total amount of the cement composition.

35. The cement composition of claim 34, wherein it is that the dispersant is used in an amount of 0.1-1 wt %, based on the total amount of the cement composition.

36. The cement composition of claim 33, wherein the composition further comprises a filtrate reducer.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0083] The FIGURE illustrates a Gel Permeation Chromatography diagram of the polymer produced in Example 1.

DESCRIPTION OF THE PREFERRED EMBODIMENT

[0084] The present invention will be described in detail below with reference to examples, but the invention is not subjected to limitation of the examples.

[0085] Unless otherwise specified, the raw materials used in the Examples and Comparative Examples are commercially available, or prepared according to the methods of the prior art.

[0086] In the following Examples and Comparative Examples, the amounts of the structural units in the polymer are determined by using the feeding amount of said monomers, in particular, the feeding ratio of individual monomer which actually participates the polymerization is determined by measuring the content of unreacted monomer, thereby determining the contents of said structural units in the polymer; the solid content is obtained through calculation based on the feeding amount, that is, solid content=feeding amount (weight) excluding the solvent/feeding amount (weight) including the solvent*100%. In the Examples, the polymer has a single peak in the DSC spectrogram, indicating that the polymers are random copolymers.

Example 1

[0087] 101 g of water and 60 g (0.025 mol) of isopentenyl polyoxyethylene ether (TPEG, with a weight average molecular weight of 2,400) were weighted and sufficiently dissolved and uniformly mixed, the mixture was poured into a three-port flask in a constant-temperature water bath, and subjected to a constant speed stirring by a stirring paddle at a rotation speed of 200 rpm and heated to 65° C.; 0.52 g of H.sub.2O.sub.2 having a concentration of 30% by mass was weighted and added into the three-port flask. 3.6 g of Acrylic Acid (AA), 36.8 g of p-styrene sulfonic acid, 3 g of vinyl octadecyl trimethoxysilane and 100 g of water were mixed uniformly to form a drip solution A; 0.48 g of mercaptopropionic acid, 0.21 g of vitamin C and 45 g of water were blended uniformly to form a drip solution B. The drip solution A and the drip solution B were dropwise added into the three-port flask in a constant speed by a peristaltic pump, the drip solution A was dropwise added for 3 hours, and the drip solution B was dropwise added for 3.5 hours. After the dropwise adding operation was completed, the temperature was kept for 1 hour. The obtained sample had an actual solid content of 30.0 wt %. Upon the Gel Permeation Chromatography (the FIGURE): the polymer had a weight average molecular weight of 50,280.

Example 2

[0088] 98 g of water and 60 g (0.025 mol) of isopentenyl polyoxyethylene ether (TPEG, with a weight average molecular weight of 2,400) were weighted and sufficiently dissolved and uniformly mixed, the mixture was poured into a three-port flask in a constant-temperature water bath, and subjected to a constant speed stirring by a stirring paddle at a rotation speed of 200 rpm and heated to 65° C., 0.52 g of H.sub.2O.sub.2 having a concentration of 30% by mass was weighted and added into the three-port flask. 7.2 g of Acrylic Acid (AA), 27.6 g of p-styrene sulfonic acid, 5.81 g of 7-octenyl trimethoxysilane and 100 g of water were mixed uniformly to form a drip solution A; 0.48 g of mercaptopropionic acid, 0.21 g of vitamin C and 45 g of water were blended uniformly to form a drip solution B. The drip solution A and the drip solution B were dropwise added into the three-port flask in a constant speed by a peristaltic pump, the drip solution A was dropwise added for 3 hours, and the drip solution B was dropwise added for 3.5 hours. After the dropwise adding operation was completed, the temperature was kept for 1 hour. The obtained sample had an actual solid content of 30.1 wt %. The polymer had a weight average molecular weight of 52,000.

Example 3

[0089] 103 g of water and 60 g (0.025 mol) of isopentenyl polyoxyethylene ether (TPEG, with a weight average molecular weight of 2,400) were weighted and sufficiently dissolved and uniformly mixed, the mixture was poured into a three-port flask in a constant-temperature water bath, and subjected to a constant speed stirring by a stirring paddle at a rotation speed of 200 rpm and heated to 65° C.; 0.52 g of H.sub.2O.sub.2 having a concentration of 30% by mass was weighted and added into the three-port flask. 3.25 g of Itaconic Acid (IA), 46 g of p-styrene sulfonic acid, 3.95 g of vinyl dodecyl trimethoxysilane and 100 g of water were mixed uniformly to form a drip solution A; 0.55 g of mercaptopropionic acid, 0.24 g of vitamin C and 65 g of water were blended uniformly to form a drip solution B. The drip solution A and the drip solution B were dropwise added into the three-port flask in a constant speed by a peristaltic pump, the drip solution A was dropwise added for 3 hours, and the drip solution B was dropwise added for 3.5 hours. After the dropwise adding operation was completed, the temperature was kept for 1 hour. The obtained sample had an actual solid content of 29.9 wt %. The polymer had a weight average molecular weight of 53,890.

Example 4

[0090] The polymerization reaction was carried out according to the method of Example 1, except that 36.8 g of p-styrene sulfonic acid was replaced by the same molar amount (i.e., 41.4 g) of 2-Acrylamido-2-methylpropane sulfonic acid (AMPS), the obtained sample had an actual solid content of 29.7 wt %, the polymer had a weight average molecular weight of 54,130.

Example 5

[0091] The polymerization reaction was carried out according to the method of Example 1, except that 3 g of vinyl octadecyl trimethoxysilane was replaced by the same molar amount (i.e., 1.86 g) of γ-methacryloxy propyl trimethoxysilane, the obtained sample had an actual solid content of 30.2 wt %, the polymer had a weight average molecular weight of 51,768.

Example 6

[0092] The polymerization reaction was carried out according to the method of Example 1, except that 36.8 g of p-styrene sulfonic acid was replaced by the same molar amount of 2-Acrylamido-2-methylpropane sulfonic acid (AMPS), 3 g of vinyl octadecyl trimethoxysilane was replaced by the same molar amount of γ-methacryloxy propyl trimethoxysilane, the obtained sample had an actual solid content of 30.1 wt %, the polymer had a weight average molecular weight of 50,354.

Example 7

[0093] The polymerization was carried out according to the method of Example 1, except that the molar ratio of TPEG:Acrylic Acid (AA):sulfonic acid was 1:5:5, the obtained sample had an actual solid content of 29.8 wt %, the polymer had a weight average molecular weight of 50,211.

Example 8

[0094] 70 g of water and 60 g of HPEG were weighted and sufficiently dissolved and uniformly mixed, the mixture was poured into a three-port flask in a constant-temperature water bath, and subjected to a constant speed stirring by a stirring paddle at a rotation speed of 200 rpm and heated to 65° C., 0.52 g of H.sub.2O.sub.2 having a concentration of 30% by mass was weighted and added into the three-port flask. 3.6 g of AA, 31.1 g of AMPS, 0.62 g of KH570 and 100 g of water were mixed uniformly to form a drip solution A; 0.48 g of mercaptopropionic acid, 0.21 g of vitamin C and 45 g of water were blended uniformly to form a drip solution B. The drip solution A and the drip solution B were dropwise added into the three-port flask in a constant speed by a peristaltic pump, the drip solution A was dropwise added for 3 hours, and the drip solution B was dropwise added for 3.5 hours. After the dropwise adding operation was completed, the temperature was kept for 1 hour. The obtained sample had an actual solid content of 30.2 wt %, the polymer had a weight average molecular weight of 51,070.

Example 9

[0095] 70 g of water and 60 g of TPEG were weighted and sufficiently dissolved and uniformly mixed, the mixture was poured into a three-port flask in a constant-temperature water bath, and subjected to a constant speed stirring by a stirring paddle at a rotation speed of 200 rpm and heated to 65° C., 0.58 g of H.sub.2O.sub.2 having a concentration of 30% by mass was weighted and added into the three-port flask. 9.76 g of IA, 31.1 g of AMPS, 1.24 g of KH570 and 100 g of water were mixed uniformly to form a drip solution A; 0.54 g of mercaptopropionic acid, 0.23 g of vitamin C and 60 g of water were blended uniformly to form a drip solution B. The drip solution A and the drip solution B were dropwise added into the three-port flask in a constant speed by a peristaltic pump, the drip solution A was dropwise added for 3.5 hours, and the drip solution B was dropwise added for 4 hours. After the dropwise adding operation was completed, the temperature was kept for 1.5 hours. The obtained sample had an actual solid content of 30.3 wt %, the polymer had a weight average molecular weight of 50,911.

Comparative Example 1

[0096] The polymerization reaction was carried out according to the method of Example 1, except that 36.8 g of p-styrene sulfonic acid was replaced by the same molar amount (i.e., 14.4 g) of Acrylic Acid (AA), the obtained sample had an actual solid content of 29.5 wt %, the polymer had a weight average molecular weight of 43,627.

Comparative Example 2

[0097] The polymerization reaction was carried out according to the method of Comparative Example 1, except that the vinyl octadecyl trimethoxysilane was not added, the obtained sample had an actual solid content of 29.9 wt %, the polymer had a weight average molecular weight of 51,397.

Comparative Example 3

[0098] The polymerization reaction was carried out according to the method of Example 15 in CN108250370A, the obtained sample had an actual solid content of 29.6 wt %, the polymer had a weight average molecular weight of 50,280.

Comparative Example 4

[0099] The polymerization reaction was carried out according to the method of Example 1, except that the TPEG, AA and vinyl octadecyl trimethoxysilane were not added, the obtained sample had an actual solid content of 29.1 wt %, the polymer had a weight average molecular weight of 71,583.

[0100] Performance Testing:

[0101] (1) A cement slurry was prepared according to the National Standard GB/T19139-2003 of China for evaluating its rheological property and thickening time. The cement in use was the class G cement manufactured by the Sichuan Jiahua Cement Plant, and the base slurry I was formulated by mixing 100 parts by weight of cement and 40 parts by weight of water, the mixing amount of the dispersants (the mixture produced from polymerization) in Comparative Examples 1-4 and Examples 1-7 were 0.4% by mass of the cement. The testing results were shown in Table 1.

TABLE-US-00001 TABLE 1 Flow index Thickening time Compressive strength n at 85° C. at 48 h (MPa) 25° C. 85° C. (min) 25° C. 50° C. Base slurry I 0.42 0.34 71 21.21 23.53 Example 1 0.91 0.85 79 21.12 23.45 Example 2 0.86 0.80 77 20.94 23.89 Example 3 0.87 0.82 78 21.93 24.02 Example 4 0.83 0.77 95 19.06 22.32 Example 5 0.84 0.76 91 19.23 23.42 Example 6 0.70 0.66 102 20.91 22.86 Example 7 0.82 0.75 106 19.03 22.94 Example 8 0.67 0.59 104 20.08 22.12 Example 9 0.69 0.60 105 20.54 21.73 Comparative 0.80 0.74 135 18.00 21.15 Example 1 Comparative 0.82 0.67 99 19.42 21.78 Example 2 Comparative 0.75 0.68 181 18.13 20.35 Example 3 Comparative 0.67 0.57 78 20.18 22.76 Example 4

[0102] As can be seen from Table 1, the dispersant prepared in the present invention had a low delayed coagulation property while ensuring a desired dispersibility in the case of a high used amount of sulfonic acid.

[0103] (2) A cement slurry was prepared according to the National Standard GB/T19139-2003 of China for evaluating its rheological property, thickening time and compressive strength. The base slurry II was formulated by mixing 100 parts by weight of cement and 4 parts by weight filtrate reducer and 44 parts by weight of water, the mixing amount of the dispersant was 0.7% by mass of the cement. The filtrate reducer was SCF-180L filtrate reducer produced by the Sinopec Petroleum Engineering Technology Research Institute, the other ingredients were derived from the same sources as those in the formulation I. The testing results were shown in Table 2.

TABLE-US-00002 TABLE 2 Flow index Thickening time Compressive strength n at 85° C. at 48 h (MPa) 25° C. 85° C. (min) 25° C. 50° C. Base slurry II 0.56 0.43 131 20.40 22.77 Example 1 0.81 0.75 136 21.57 23.98 Example 2 0.76 0.74 135 20.22 24.56 Example 3 0.77 0.72 132 21.98 23.02 Example 4 0.72 0.69 145 19.06 22.32 Example 5 0.73 0.67 141 19.23 23.42 Example 6 0.68 0.61 147 20.91 22.86 Example 7 0.73 0.63 159 20.03 22.94 Example 8 0.64 0.57 152 21.57 23.98 Example 9 0.65 0.58 155 19.23 23.42 Comparative 0.73 0.65 251 16.23 19.86 Example 1 Comparative 0.70 0.61 146 17.56 20.15 Example 2 Comparative 0.72 0.67 269 18.56 21.11 Example 3 Comparative 0.62 0.54 173 17.93 21.35 Example 4

[0104] As can be seen from Table 2, when the dispersants in the present invention were complexed with a filtrate reducer, the dispersants had an obvious dispersion effect, and the thickening time was not significantly influenced, the compressive strength of the set cement was not reduced.

[0105] (3) A cement slurry was prepared according to the National Standard GB/T19139-2003 of China for evaluating its rheological property, thickening time and compressive strength. The base slurry III was formulated by mixing 450 g cement, 225 g silicon powder, 225 g weighting material micro manganese powder, 31.5 g filtrate reducer, 27 g nanometer liquid silicon, 27 g latex, 14 g set retarder, 2 g dispersant and 200 g of on-site water, wherein the filtrate reducer was SCF-180L filtrate reducer (AMPS type filtrate reducer) produced by the Sinopec Petroleum Engineering Technology Research Institute, the set retarder was SCR-3 set retarder (acid-type set retarder) produced by the Sinopec Petroleum Engineering Technology Research Institute, the other ingredients were derived from the same sources as those in the formulation I. The testing results were shown in Table 3.

TABLE-US-00003 TABLE 3 Thickening Compressive strength Flow index n time at at 48 h (MPa) 25° C. 85° C. 85° C. (min) 25° C. 50° C. Base slurry 0.51 0.46 251 18.34 20.73 III Example 1 0.84 0.79 257 18.50 20.65 Example 2 0.79 0.76 259 18.53 20.57 Example 3 0.81 0.77 251 17.98 20.20 Example 4 0.77 0.73 256 18.01 20.36 Example 5 0.76 0.69 272 18.52 20.24 Example 6 0.70 0.64 258 17.99 20.68 Example 7 0.75 0.69 277 18.03 20.34 Example 8 0.67 0.60 260 17.96 20.18 Example 9 0.68 0.61 263 18.11 20.20 Comparative 0.65 0.54 343 17.40 19.76 Example 1 Comparative 0.70 0.62 290 17.42 20.01 Example 2 Comparative 0.64 0.55 351 18.49 20.31 Example 3 Comparative 0.66 0.59 280 18.63 20.08 Example 4

[0106] Formula III was exactly the currently used cement slurry formulation. As can be seen in Table 3, the dispersants of the present invention had desirable compatibility with other additives in the cement slurry, the dispersants had an obvious dispersion effect, and the thickening time was not significantly influenced, the compressive strength of the set cement was not reduced. However, when the dispersants in Comparative Example 1 and Comparative Example 3 were used in combination with the set retarder, the dispersibility of said dispersants was affected, the dispersibility was lower than the dispersants in the present application, and the delayed coagulation time was greatly extended.

[0107] Although the invention has been described in detail, the modifications within the inventive concept and scopes will be apparent for those skilled in the art. Moreover, it shall be comprehended that the various aspects described in the invention, the portions of different specific embodiments, and various features enumerated herein may be combined or interchanged in whole or in part. In the various embodiments described above, those embodiments that refer to another specific embodiment can be appropriately combined with other embodiments, as will be understood by those skilled in the art. Furthermore, those skilled in the art will understand that the foregoing description is only used as the typical example, instead of imposing limitation on the present invention.