阅读说明：本技术 一种水煤浆分散剂的制备方法以及水煤浆分散剂 (Preparation method of coal water slurry dispersant and coal water slurry dispersant ) 是由 柯凯 郭洁茹 于 2021-01-29 设计创作，主要内容包括：本发明提供水煤浆分散剂的制备方法及由该方法制得的水煤浆分散剂。本发明的水煤浆分散剂的制备方法包括：使聚醚醇头和环状单体在催化剂的作用下合成成聚醚；使所述聚醚在还原剂、引发剂、链转移剂的作用下与亲水小单体反应,制得聚醚分散剂；以及在所述聚醚分散剂中加入中和剂,制得水煤浆分散剂。其中,以原料总量为1000质量份计,各原料的用量为：聚醚醇头9.99-10.52质量份、环状单体334.65-352.26质量份、催化剂0.5-1.6质量份、亲水小单体35.36-37.22质量份、还原剂2.5-5.8质量份、引发剂3.5-5.7质量份、链转移剂1.2-3.3质量份、中和剂4.8-8.3质量份、其余为水,并且,所述聚醚醇头为丙二醇单烯丙基醚,所述环状单体为环氧乙烷和环氧丙烷,所述亲水小单体为(丙-2-烯酰氨基)甲磺酸和3-甲基-2-丙烯胺。(The invention provides a preparation method of a coal water slurry dispersing agent and the coal water slurry dispersing agent prepared by the method. The preparation method of the coal water slurry dispersing agent comprises the following steps: synthesizing polyether alcohol head and cyclic monomer into polyether under the action of catalyst; reacting the polyether with a hydrophilic small monomer under the action of a reducing agent, an initiator and a chain transfer agent to prepare a polyether dispersant; and adding a neutralizer into the polyether dispersant to prepare the coal water slurry dispersant. Wherein the total amount of the raw materials is 1000 parts by mass, and the dosage of each raw material is as follows: 9.99-10.52 parts of polyether alcohol head, 334.65-352.26 parts of cyclic monomer, 0.5-1.6 parts of catalyst, 35.36-37.22 parts of hydrophilic small monomer, 2.5-5.8 parts of reducing agent, 3.5-5.7 parts of initiator, 1.2-3.3 parts of chain transfer agent, 4.8-8.3 parts of neutralizing agent and the balance of water, wherein the polyether alcohol head is propylene glycol monoallyl ether, the cyclic monomer is ethylene oxide and propylene oxide, and the hydrophilic small monomer is (propane-2-enamino) methane sulfonic acid and 3-methyl-2-allylamine.)

1. A preparation method of a coal water slurry dispersing agent is characterized by comprising the following steps:

synthesizing polyether alcohol head and cyclic monomer into polyether under the action of catalyst;

reacting the polyether with a hydrophilic small monomer under the action of a reducing agent, an initiator and a chain transfer agent to prepare a polyether dispersant; and

adding a neutralizer into the polyether dispersant to prepare the coal water slurry dispersant,

the dosage of each raw material is as follows by taking the total amount of the raw materials as 1000 parts by mass: 9.99 to 10.52 parts of polyether alcohol head, 334.65 to 352.26 parts of cyclic monomer, 0.5 to 1.6 parts of catalyst, 35.36 to 37.22 parts of hydrophilic small monomer, 2.5 to 5.8 parts of reducing agent, 3.5 to 5.7 parts of initiator, 1.2 to 3.3 parts of chain transfer agent, 4.8 to 8.3 parts of neutralizing agent and the balance of water,

the polyether alcohol head is propylene glycol monoallyl ether, the cyclic monomer is ethylene oxide and propylene oxide, and the hydrophilic small monomer is (propyl-2-enamido) methanesulfonic acid and 3-methyl-2-allylamine.

2. The method according to claim 1, wherein the amount of the raw materials other than water in the coal-water slurry dispersant is 39 to 43 mass% based on the total amount of the raw materials.

3. The method according to claim 1, wherein the amount of the raw materials other than water in the coal-water slurry dispersant is 42 mass% based on the total amount of the raw materials.

4. The method of claim 1, wherein the mass ratio of the hydrophilic small monomer to the polyether is 1 (9.26-10.26).

5. The method according to claim 1, wherein the catalyst is one or more selected from the group consisting of anhydrous aluminum chloride, boron trifluoride, concentrated sulfuric acid, hydrogen halide, arylsulfonic acid, inorganic phosphorus compounds, carboxylic acids, organic cation exchange resins and aluminum phenoxides, sodium hydroxide, potassium hydroxide, sodium cyanide, lithium aluminum tetrahydrofluoride, boron trifluoride vinyl ether, DMC.

6. The method according to claim 1, wherein the reducing agent is one or more selected from the group consisting of sodium dithionite, ascorbic acid, sodium formaldehyde sulfoxylate, maltodextrin, sodium bisulfite, sodium metabisulfite, sodium hypophosphite.

7. The method according to claim 1, wherein the initiator is one or more selected from the group consisting of ammonium persulfate, azobisisobutyronitrile, diisopropyl peroxydicarbonate, Benzoyl Peroxide (BPO), di-t-butyl peroxide (DTBP), dicyclohexyl peroxydicarbonate.

8. The method of claim 1, wherein the chain transfer agent is one or more selected from the group consisting of thioglycolic acid, mercaptopropionic acid, mercaptoethanol, mercaptopropanol.

9. The method according to claim 1, wherein the neutralizing agent is one or more selected from the group consisting of sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate, potassium carbonate, sodium methoxide, sodium ethoxide, ethanolamine, diethanolamine, triethanolamine, triisopropanolamine.

10. A dispersant for coal water slurry obtainable by the process of any one of claims 1 to 9.

Technical Field

The invention relates to a preparation method of a coal water slurry dispersing agent and the coal water slurry dispersing agent prepared by the method.

Background

In the water paint industry, the wetting and dispersion of pigments and fillers in water are key links of paint manufacturing technology, and the dispersing agent has very important significance for paint production, storage and use. Dispersants are chemicals which disperse fine-grained substances in aqueous or organic media and form stable, finely divided suspensions. They are natural or synthetic compounds containing hydrophilic and hydrophobic groups (or segments) which function to reduce the adhesion between the particles or droplets and prevent them from flocculating or agglomerating.

Patent CN 110747021A discloses a coal water slurry dispersant, a preparation method and application thereof. The invention relates to the field of coal water slurry dispersants, and particularly discloses a coal water slurry dispersant, and a preparation method and application thereof. The method comprises the steps of adding a lignin dispersant into a system after naphthalene sulfonation reaction, consuming the residual sulfuric acid in the naphthalene sulfonation reaction, directly producing the composite dispersant by a one-pot reaction method, and having simple process and no need of additional treatment steps; meanwhile, the residual sulfuric acid in the naphthalene sulfonation reaction is recycled, and the using amount of the acid-base regulator is reduced. The dispersant prepared by the method has wider coal application range and further widens the utilization range of products. The coal water slurry prepared by the dispersant has higher concentration, and has better fluidity and stability.

Patent CN 109929632a discloses a water-coal-slurry dispersant. The invention relates to the technical field of dispersants, and particularly relates to a coal water slurry dispersant. A coal water slurry dispersing agent comprises the following components in parts by weight: 30-40 parts of industrial naphthalene; 20-30 parts of sulfuric acid; 20-40 parts of water; 10-15 parts of formaldehyde; 5-8 parts of lime water; 2-5 parts of polyacrylamide. The coal water slurry dispersing agent has the advantages of stable structure, no layering, no precipitation, good dispersing effect, no waste discharge, environmental protection and economy.

Patent CN 110818855a discloses a method for preparing sorbitol modified comb-type coal water slurry dispersant. The invention provides a method for preparing sorbitol modified comb-type coal water slurry dispersing agent, which comprises the following steps: (1) accurately weighing the raw materials in parts by weight; (2) sorbitol is esterified; (3) preparing A, B materials; (4) adding a monomer, methacrylic acid, ammonium persulfate, esterified sorbitol and deionized water into a reactor, stirring and mixing uniformly, and dripping A, B materials; (5) reacting for 0.5-1.5h, and supplementing the rest deionized water to obtain the modified comb-type coal water slurry dispersant. According to the invention, sorbitol is used for replacing part of monomer modified carboxylic acid comb type coal water slurry dispersing agent, each functional group of sorbitol is connected to the main chain, the dispersibility is increased, active groups such as amide groups, hydroxyl groups, carboxyl groups, ethers, ester groups, polyoxyethylene groups and the like in the product act on coal water slurry particles, the dispersing effect of the coal water slurry is enhanced, and the product has good stability.

Disclosure of Invention

The invention aims to provide a preparation method of a high-fluidity cation coal water slurry dispersing agent and the coal water slurry dispersing agent prepared by the method.

The preparation method of the coal water slurry dispersant provided by the invention is characterized by comprising the following steps:

synthesizing polyether alcohol head and cyclic monomer into polyether under the action of catalyst;

reacting the polyether with a hydrophilic small monomer under the action of a reducing agent, an initiator and a chain transfer agent to prepare a polyether dispersant; and

adding a neutralizer into the polyether dispersant to prepare the coal water slurry dispersant,

the dosage of each raw material is as follows by taking the total amount of the raw materials as 1000 parts by mass: 9.99 to 10.52 parts of polyether alcohol head, 334.65 to 352.26 parts of cyclic monomer, 0.5 to 1.6 parts of catalyst, 35.36 to 37.22 parts of hydrophilic small monomer, 2.5 to 5.8 parts of reducing agent, 3.5 to 5.7 parts of initiator, 1.2 to 3.3 parts of chain transfer agent, 4.8 to 8.3 parts of neutralizing agent and the balance of water,

the polyether alcohol head is propylene glycol monoallyl ether, the cyclic monomer is ethylene oxide and propylene oxide, and the hydrophilic small monomer is (propyl-2-enamido) methanesulfonic acid and 3-methyl-2-allylamine.

The invention also provides a coal water slurry dispersing agent prepared by the method.

Different from the prior patent technology, the dispersant prepared by the invention is a high-fluidity cation water-coal-slurry dispersant. According to the invention, a proper amount of propylene glycol monoallyl ether is selected to react with ethylene oxide and propylene oxide to synthesize polyether with the molecular weight of 4000, the polyether is used as a branched chain to synthesize the polyether dispersant, and sulfonate and cationic hydrophilic groups are selected to enhance the adsorption capacity of the dispersant, so that the utilization rate of the dispersant is improved. The dispersing agent has excellent dispersion persistence and coating property, is more attached to the coal water slurry particles, and has good dispersion effect on the coal water slurry particles.

The invention concept of the invention is as follows: the invention provides a high-fluidity cation water-coal-slurry dispersing agent and a preparation method thereof. The invention firstly synthesizes polyether with 4000 molecular weight, and then synthesizes the required dispersant molecule by taking the synthesized polyether as a raw material. The polyether branched chain with the molecular weight of 4000 has good steric hindrance, and is prepared by matching with a higher acid-ether ratio, so that the dispersant molecule has a high-concentration polar group, and the adsorption effect of the dispersant on the water-coal-slurry particles is improved.

Detailed Description

The invention provides a preparation method of a coal water slurry dispersing agent, which is characterized by comprising the following steps:

synthesizing polyether alcohol head and cyclic monomer into polyether under the action of catalyst;

reacting the polyether with a hydrophilic small monomer under the action of a reducing agent, an initiator and a chain transfer agent to prepare a polyether dispersant; and

adding a neutralizer into the polyether dispersant to prepare the coal water slurry dispersant,

the dosage of each raw material is as follows by taking the total amount of the raw materials as 1000 parts by mass: 9.99 to 10.52 parts of polyether alcohol head, 334.65 to 352.26 parts of cyclic monomer, 0.5 to 1.6 parts of catalyst, 35.36 to 37.22 parts of hydrophilic small monomer, 2.5 to 5.8 parts of reducing agent, 3.5 to 5.7 parts of initiator, 1.2 to 3.3 parts of chain transfer agent, 4.8 to 8.3 parts of neutralizing agent and the balance of water,

wherein the polyether alcohol head is propylene glycol monoallyl ether, and the CAS number: 1331-17-5, the cyclic monomer is ethylene oxide and propylene oxide, the hydrophilic small monomer is (propyl-2-alkenoyl amino) methane sulfonic acid and 3-methyl-2-allylamine.

Further, in the coal-water slurry dispersant, the amount of the raw materials other than water is preferably 39 to 43 mass%, more preferably 42 mass%, based on the total amount of the raw materials.

In addition, in the hydrophilic small monomer, the mass ratio of the (prop-2-enamido) methanesulfonic acid to the 3-methyl-2-propenamine may be 1: (0.5-1.5), preferably 1: 1.

In the present invention, it is preferable that the acid-ether ratio is 1 (9.26 to 10.26), wherein the "acid" in the "acid-ether ratio" means the hydrophilic small monomer, and the "ether" in the "acid-ether ratio" means the polyether obtained by polymerizing the polyether alcohol head and the epoxy monomer in the present invention.

The catalyst may be a catalyst commonly used in the art, and for example, may be one or more selected from the group consisting of anhydrous aluminum chloride, boron trifluoride, concentrated sulfuric acid, hydrogen halide, arylsulfonic acid, inorganic phosphorus compounds, carboxylic acids, organic cation exchange resins, and aluminum phenoxide, sodium hydroxide, potassium hydroxide, sodium cyanide, lithium aluminum hydride, boron trifluoride vinyl ether, DMC, preferably a composition of concentrated sulfuric acid and lithium aluminum hydride in a mass ratio of 3: 2.

The reducing agent may be a reducing agent commonly used in the art, and for example, may be one or more selected from the group consisting of sodium dithionite, ascorbic acid, sodium formaldehyde sulfoxylate, maltodextrin, sodium bisulfite, sodium metabisulfite, sodium hypophosphite, preferably a combination of sodium dithionite and maltodextrin in a mass ratio of 2: 1.

The initiator may be an initiator commonly used in the art, for example, one or more selected from the group consisting of ammonium persulfate, azobisisobutyronitrile, diisopropyl peroxydicarbonate, Benzoyl Peroxide (BPO), di-t-butyl peroxide (DTBP), dicyclohexyl peroxydicarbonate, and preferably a composition of diisopropyl peroxydicarbonate and di-t-butyl peroxide in a mass ratio of 1: 3.

The chain transfer agent may be a chain transfer agent commonly used in the art, and for example, may be one or more selected from the group consisting of thioglycolic acid, mercaptopropionic acid, mercaptoethanol, mercaptopropanol, and preferably a composition of mercaptopropionic acid and mercaptopropanol in a mass ratio of 1: 1.

The neutralizing agent may be a neutralizing agent commonly used in the art, and for example, may be one or more selected from the group consisting of sodium hydroxide, potassium hydroxide, sodium carbonate, sodium bicarbonate, potassium carbonate, sodium methoxide, sodium ethoxide, ethanolamine, diethanolamine, triethanolamine, triisopropanolamine, and preferably a composition of sodium methoxide and diethanolamine in a mass ratio of 3: 2.

As a preferred embodiment, the preparation method of the coal water slurry dispersing agent provided by the invention comprises the following operation steps:

the method comprises the following steps: adding 9.99-10.52 parts by mass of polyether alcohol head and 0.5-1.6 parts by mass of catalyst into a high-pressure reaction kettle provided with a stirrer and a thermometer, performing nitrogen replacement for 3 times, vacuumizing to gauge pressure of-0.098 MPa, heating to 115-fold organic silicon at 120 ℃, dehydrating for 1-2h, measuring the oxygen content, cooling to 110 ℃ after the oxygen content is qualified, continuously introducing 334.65-352.26 parts by mass of annular monomer, controlling the pressure to be less than 0.6MPa, keeping the temperature at 115-fold organic silicon at 125 ℃ for 2-3h after the introduction is finished, aging to negative pressure, cooling and discharging to obtain the crude polyether.

Step two: placing the crude polyether in a reaction kettle, replacing for 3 times by nitrogen under negative pressure, heating to 120-phase-change temperature of 130 ℃, stirring for 0.5-1h, cooling to 90-100 ℃, adding distilled water, stirring for 1-1.5h, heating to 115-phase-change temperature of 125 ℃ while vacuumizing, cooling and discharging to obtain the finished product polyether.

Step three: adding the prepared finished polyether into a reaction kettle, heating to 45-50 ℃ by adopting water bath, reacting for 2.5-3 hours, and then preserving heat for 1-2 hours. Preparing 2.5-5.8 parts by mass of a reducing agent, 3.5-5.7 parts by mass of an initiator, 1.2-3.3 parts by mass of a chain transfer agent and water into solution A, preparing 35.36-37.22 parts by mass of a hydrophilic small monomer and water into solution B, and dropwise adding A, B into a reaction kettle by using a dropwise adding pump, wherein the solution A is dropwise added for 1-2 hours, and the solution B is dropwise added for 1.5-2.5 hours to prepare the polyether dispersant.

Step four: adding 4.8-8.3 parts by mass of neutralizing agent into the prepared coal water slurry dispersing agent, and supplementing water until the total mass is 1000 parts by mass, thereby obtaining the coal water slurry dispersing agent.

The invention also provides a coal water slurry dispersing agent prepared by the method.

Compared with the prior art, the invention has the advantages and beneficial effects that:

1. the polyether prepared by adopting the water washing refining method has higher purity, and can form dispersant molecules with uniform molecular weight with hydrophilic small monomers.

2. The molecular weight of the polyether prepared by the invention is larger, the branched chain of the prepared dispersant is longer, and the dispersant can play a good steric hindrance role, and the invention designs the acid-ether ratio of the hydrophilic small monomer to the polyether according to the designed length of the side chain, wherein the mass ratio of the hydrophilic small monomer to the polyether is 1 (9.26-10.26), and under the condition of longer side chain, the side chain density is lower, so that the molecular space configuration can be met, and a better adsorption effect is obtained.

3. The propylene glycol monoallyl ether used in the invention has a methyl branched chain, can provide hydrophobic capacity for the dispersant, can discharge water molecules from the coal water slurry adsorption layer, and increases the content of free water in the coal water slurry, thereby increasing the fluidity of the coal water slurry and facilitating the transportation of the coal water slurry.

Examples

Hereinafter, the technical solutions and advantageous effects of the present invention will be further described in detail with reference to specific examples and comparative examples, but it should be understood that the following examples should not be construed as limiting the scope of protection claimed in the present claims to any extent. In the examples and comparative examples, "part" means "part by mass", "ratio" means "mass ratio", and "%" means "% by mass", unless otherwise specified.

Example 1

Example 1 is intended to illustrate a method for producing a dispersant for coal water slurry according to the present invention and a dispersant for coal water slurry produced by the method.

The coal water slurry dispersing agent of the embodiment is polymerized by the following components, the total mass of the raw materials is 1000 parts, and the dosage of each component is as follows:

10.13 parts of propylene glycol monoallyl ether

149.24 parts of ethylene oxide

195.32 parts of propylene oxide

0.6 part of composition of concentrated sulfuric acid and lithium aluminum hydride in a mass ratio of 3:2

36.74 parts of composition of (propyl-2-enamino) methane sulfonic acid and 3-methyl-2-allylamine with mass ratio of 1:1

3.2 parts of composition of sodium hydrosulfite and maltodextrin in a mass ratio of 2:1

4.4 parts of a composition of diisopropyl peroxydicarbonate and di-tert-butyl peroxide in a mass ratio of 1:3

2.0 parts of composition of mercaptopropionic acid and mercaptopropanol in a mass ratio of 1:1

6.3 parts of composition of sodium methoxide and diethanol amine with mass ratio of 3:2

The balance of water, the total mass is 1000 parts

The preparation method of the coal water slurry dispersant of the embodiment is as follows:

the method comprises the following steps: adding 10.13 parts of propylene glycol monoallyl ether and 0.6 part of a composition of concentrated sulfuric acid and lithium aluminum hydride in a mass ratio of 3:2 into a high-pressure reaction kettle provided with a stirrer and a thermometer, performing nitrogen replacement for 3 times, vacuumizing to gauge pressure of-0.098 MPa, heating to 117 ℃, dehydrating for 1.3h, measuring the oxygen content, cooling to 110 ℃ after the oxygen content is qualified, continuously introducing 149.24 parts of ethylene oxide and 195.32 parts of propylene oxide, controlling the pressure to be less than 0.6MPa, keeping the temperature at 116 ℃ after the introduction is finished, aging for 2.1h to negative pressure, cooling, and discharging to obtain crude polyether.

Step two: and (3) placing the crude polyether into a reaction kettle, performing nitrogen negative pressure replacement for 3 times, heating to 124 ℃, stirring for 1.0h, cooling to 97 ℃, adding distilled water, stirring for 1.4h, heating to 124 ℃ while vacuumizing, cooling, and discharging to obtain the finished polyether.

Step three: adding the prepared finished polyether into a reaction kettle, heating to 47 ℃ by adopting water bath, reacting for 2.6 hours, and then preserving heat for 2.0 hours. 3.2 parts of a composition of sodium hydrosulfite and maltodextrin in a mass ratio of 2:1, 4.4 parts of a composition of diisopropyl peroxydicarbonate and di-tert-butyl peroxide in a mass ratio of 1:3, 2.0 parts of a composition of mercaptopropionic acid and mercaptopropanol in a mass ratio of 1:1 and water are prepared into a solution A, 36.74 parts of a composition of (prop-2-enamino) methanesulfonic acid and 3-methyl-2-allylamine in a mass ratio of 1:1 and water are prepared into a solution B, and A, B is dripped into a reaction kettle by a dripping pump, wherein the A is dripped for 1.7 hours, and the B is dripped for 2.5 hours. And (4) preparing the polyether dispersant.

Step four: 6.3 parts of the composition of sodium methoxide and diethanol amine in the mass ratio of 3:2 is added into the prepared coal water slurry dispersing agent, and water is added until the total mass is 1000 parts, so that the coal water slurry dispersing agent in the embodiment 1 is obtained.

Examples 2 to 4

Examples 2 to 4 are intended to illustrate the method of producing the dispersant for coal water slurry of the present invention and the dispersant for coal water slurry produced by the method.

In this example, the coal-water slurry dispersants of examples 2 to 4 were obtained in the same manner as in example 1, except that the components and amounts of the raw materials were as shown in Table 1 and the parameters in the steps were as shown in Table 2.

Example 5

Example 5 is used to compare with example 1 and shows that the dispersant of the coal water slurry obtained has a better dispersing effect when the solid content is 42%.

In this example, the coal-water slurry dispersants of examples 2 to 4 were obtained in the same manner as in example 1, except that the components and amounts of the raw materials were as shown in Table 1 and the parameters in the steps were as shown in Table 2.

Comparative examples 1 to 2

Comparative examples 1-2 were used to compare with example 5, and show that the dispersant for coal-water slurry obtained when the acid ether ratio is out of the range of 1 (9.26-10.26) had poor dispersing effect.

In this comparative example, the coal-water slurry dispersants of comparative examples 1 to 2 were obtained by the same method as in example 5 except that the acid-ether ratios were 1:14.57 and 1:8.15, respectively.

The Nantong Yongle YL-609 coal water slurry dispersant was tested with the coal water slurry dispersants of examples 1-5 and comparative examples 1-2 to obtain the following table. Wherein the apparent viscosity is detected according to the standard of ASTM D4287-2000, the static stability and the dynamic stability of the water-coal-slurry are detected according to the standard of GBT 18856.5-2008, and the water separation rate of 72h is the ratio of the mass of the sediment obtained by standing the dispersing agent for 72h to the total mass.

TABLE 3

In the table, the "apparent viscosity" is the viscosity of the coal water slurry after the dispersant is added. Therefore, the lower the value of "apparent viscosity", the better the dispersing effect of the dispersant.

The static stability and the dynamic stability of the coal water slurry are the phenomena that whether coal water slurry particles agglomerate to generate precipitation and delamination or not in a coal water slurry solution under a static or dynamic condition. Thus, the smaller the values of these two indicators, the less the precipitation stratification, i.e., the more stable the coal-water slurry.

The "72 h water separation rate" is considered to be the stability of the dispersant solution itself, that is, the amount of precipitate generated after 72h standing. Therefore, the smaller the value of the "72 h water separation ratio" is, the smaller the amount of the precipitate generated after the coal water slurry is left standing is, i.e., the better the stability of the coal water slurry itself is.

According to the table, the water-coal-slurry dispersants of the examples 1 to 5 have more excellent performance compared with the Nantong Yongle YL-609 water-coal-slurry dispersant, which is shown in the following steps: the viscosity of the coal water slurry is lower and the stability is better under the same condition. The fact proves that the molecular side chain of the coal water slurry dispersant provided by the invention has reasonable space density, very high adsorption effect, better dispersion effect and better stability.

In addition, in example 5 with a solid content of 42%, compared with example 1 with a solid content of 41%, the viscosity of the coal water slurry is lower and the stability is better under the same conditions, which indicates that when the solid content is 42%, the coal water slurry dispersant provided by the invention has better dispersion effect and better stability.

In addition, the acid ether ratio of the water-coal-slurry dispersants of examples 1 to 5 in the preferred range of 1 (9.26-10.26) is lower in viscosity and better in stability of the water-coal-slurry than the water-coal-slurry dispersants of comparative examples 1 to 2 which are not in the preferred range of 1 (9.26-10.26) under the same conditions, which shows that the water-coal-slurry dispersant provided by the present invention has better dispersing effect and better stability than the water-coal-slurry dispersant of comparative examples 1 to 2 in the preferred range of 1 (9.26-10.26).