JPH10182773A - Dispersion stabilizer for carbon powder slurry - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject dispersion stabilizer that can improve the fluidity and dispersion stability in high concentration of coal or oil coke by copolymerizing a compound such as a specific polyoxyalkylenemonoamine with formaldehyde. SOLUTION: This dispersion stabilizer is a formaldehyde copolycondensate between (A) a polyoxyalkylenemonoamine of formula I (R1 and R2 are each a 1-5C alkyl; AO, BO are each 2-5C oxyalkylene; m, n are each an integer of 0-100 where 100>=m+n>=4) and (B) a monomer copolymerizable with the component A [preferably melamine or its derivative of formula II (X1 -X3 are H or CH2 OH)], (C) a compound forming sulfonic group (for example, a suflonating agent such as sodium sulfite) with a formaldehyde. The molar ratios of the component A: the component B: the component C: formaldehyde is preferably (0.005-0.5):1:(0.1-4):(1-6).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a dispersant for slurry of carbonaceous powder. More specifically, the present invention relates to a dispersion stabilizer for dispersing, for example, coal powder or oil coke powder in water to obtain a high-concentration slurry that is stable for a long period of time in a state where pipeline transportation is possible.

[0002]

2. Description of the Related Art In recent years,
Although oil is the largest source of energy worldwide, its resources are unevenly distributed and its reserves may be depleted, sometimes leading to global supply uncertainty. Therefore, early development of alternative energy to petroleum is desired to reduce dependence on petroleum. Among them, coal that is widely available worldwide and can be supplied stably at low cost is being reviewed. It is also conceivable to use, as an energy source, oil coke generated as a distillation residue when pyrolyzing a heavy fraction in petroleum refining. At this time, the problem is that coal and oil coke are solid, so they are poorly handled, cannot be transported by pipeline like oil, and are extremely disadvantageous in handling. In order to solve this, various methods have been studied for powdering coal or oil coke, dispersing the same in a liquid such as water, oil or methanol, and transporting and storing the slurry. Among them, the one in which coal or oil coke powder is dispersed in water is currently regarded as the most promising.

[0003] Here, when coal powder or oil coke powder is dispersed in water, it is desired to increase the concentration as much as possible from the viewpoint of a decrease in calorific value and an increase in transportation cost. However, when the concentration of these slurries is increased, the viscosity is remarkably increased and the fluidity is lost. Therefore, when these powders are dispersed in water, use of various dispersants has been attempted. Examples of various dispersants include naphthalene sulfonic acid formaldehyde condensate (Japanese Patent Publication No. 60-6395) and melamine sulfonic acid formaldehyde polycondensate (Japanese Unexamined Patent Publication No.
No. 7-133192), lignin sulfonate (Japanese Patent Publication No. 28798/1991), polystyrene sulfonate (Japanese Patent Application Laid-Open No. 03-200893), and a copolymer salt of (meth) acrylic acid and a vinyl monomer (Japanese Patent Publication No. Kosho 62-
No. 52791), hydroxyethanediphosphonate, nonylphenol condensate etherene oxide adduct (Japanese Patent Application Laid-Open No. 59-80320), and an addition polymer of polyethylene polyamine and alkylene oxide (Japanese Patent Publication No. Hei.
-43957) and the like. However,
These dispersants are not satisfactory in terms of fluidity and dispersion stability in practical use.

[0004]

DISCLOSURE OF THE INVENTION The present inventors have conducted intensive studies to improve the fluidity and dispersion stability at high concentrations, which are disadvantages of carbonaceous powder slurries such as coal and oil coke. When a compound having a specific structure is used as a dispersant, it has been found that the compound has an excellent dispersing effect, and the present invention has been accomplished.

That is, the present invention provides a polyoxyalkylene monoamine (A) represented by the following general formula (I), a monomer (B) capable of co-condensing polyoxyalkylene monoamine (A) with formaldehyde, and a sulfone group. A dispersion stabilizer for carbonaceous powder slurries comprising a formaldehyde co-condensate with the compound (C) to be formed. Formula (I) R ₁ O— (AO) _m (BO) _n —R ₂ —NH ₂ where R ₁ , R ₂ : alkyl group having 1 to 5 carbon atoms AO, BO: 2 to 5 carbon atoms Oxyalkylene groups AO and BO are block and / or random m, n: an integer of 0 to 100. However, 100 ≧ m + n ≧ 4.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. The compound represented by the following general formula (I) is represented by the following general formula (I): R ₁ O— (AO) _m (BO) _n —R ₂ —NH ₂ where R ₁ and R _{2 each have} 1 to 5 carbon atoms. Alkyl group AO, BO: oxyalkylene group having 2 to 5 carbon atoms AO, BO is a block and / or random m, n: an integer of 0 to 100. However, 100 ≧ m + n ≧ 4 Polyoxyalkylene monoamines such as polyoxyethylene monoamine, polyoxypropylene monoamine, and polyoxyethylene oxypropylene monoamine.
This oxyalkylene moiety preferably has 2 to 5 carbon atoms.
This oxyalkylene may be of one type, or may be one in which two or more types of oxyalkylene are bonded in a block or random manner. The number of repeating units is preferably 4 to 100, and more preferably 7 to 70.

The step of adding the compound represented by the general formula (I) may be any step for synthesizing the co-condensation of the present invention.
That is, it may be previously charged into the reaction apparatus at the start of the reaction, or may be added immediately before or immediately after pH adjustment when formaldehyde co-condensation reaction is performed under the condition of a weakly acidic pH.

The compounds represented by the general formula (I) can be used in combination of one or more kinds. Further, the addition amount is preferably 0.005 to 0.5 mol, more preferably 0.1 to 0.5 mol, per 1 mol of the monomer (B) capable of co-condensing polyoxyalkylene monoamine (A) with formaldehyde. Preferred is from 0.01 to 0.35 mol.

The monomer (B) capable of co-condensing polyoxyalkylene monoamine (A) with formaldehyde is represented by the general formula (11) Melamine, methylol group-containing melamine, sulfomethyl group-containing melamine, and the like. In the case of sulphomethyl group-containing melamine, salts thereof can also be used. As the salts, inorganic salts,
That is, potassium, sodium, alkali metal salts such as magnesium or alkaline earth metal salts, or,
Organic salts, that is, ammonium salts, monoethanolamine salts, diethanolamine salts, and the like can also be used. Among them, melamine and sulfomethyl group-containing melamine are preferred from the viewpoint of economy and reactivity.

In addition, other than the above, general formula (1111) Phenol, cresol, p
Alkyl phenols such as -t-butylphenol and pt-amylphenol, or their sulfonic acids or salts of sulfonic acids can also be used. As the salts, similarly to the general formula (II), inorganic salts and organic salts thereof can be used.

Further, the general formula (IV) , Urea, urea containing a methylol group, and urea containing a sulfomethyl group can also be used. In the case of a sulfomethyl group-containing urea, the compound represented by the general formula (II)
Similarly, inorganic salts and organic salts thereof can be used.

Further, the general formula (V) , That is, aminobenzenesulfonic acids such as sulfanilic acid, metanic acid, and ternic acid, or salts thereof. As the salts, similarly to the general formula (II), inorganic salts and organic salts thereof can be used. Among them, sulfanilic acid, metanic acid and salts thereof are preferable from the viewpoint of economy and reactivity.

In the present invention, the monomers represented by the general formulas (I), (II), (III), (IV) and (V) are combined. Although it can be used, it is preferable to use the general formula (II) or to use the general formula (II) and the general formula (V) in combination from the viewpoint of economy and reactivity.

As the compound that generates a sulfone group, known sulfonating agents such as sodium sulfite, sodium bisulfite, sodium pyrosulfite, sulfur dioxide, fuming sulfuric acid and the like can be used. These sulfonating agents have been previously prepared by the general formulas (II), (III) and (IV)
The sulfomethyl group may be used to introduce a sulfomethyl group into a raw material corresponding to the above, or a sulfomethyl group may be introduced directly into the cocondensate by acting after synthesizing a cocondensate with formaldehyde.

The method for introducing a sulfomethyl group into melamine can be carried out by a known method. That is, it can be introduced by adding and condensing melamine with formaldehyde to form methylol melamine, followed by the action of a sulfonating agent and replacement with a hydroxyl group. It is known that 6 mol of formaldehyde is addition-condensed as methylol group to 1 mol of melamine. In the present invention, since 2 moles of methylol groups are likely to be used for cocondensation, sulfomethyl groups can be introduced into the remaining 4 moles of methylol groups at the maximum. Considering the economic aspect and the dispersing effect of the obtained co-condensate, the amount of sulfomethyl group to be introduced is preferably from 0.3 to 4 mol, more preferably from 0.5 to 2 mol.

The same applies to the case where a sulfomethyl group is introduced into phenol.
２2 mol is preferable, and more preferably 0.5 to 2 mol.
Introduction of .about.1.5 mol is preferred. Further, the same applies to the case where a sulfomethyl group is introduced into urea, and the amount of introduction is preferably from 0.3 to 2 mol, more preferably from 0.5 to 1.5 mol, per mol of urea.

The formaldehyde used for synthesizing these formaldehyde cocondensates is usually 3
Those having a concentration of 0 to 60% by weight can be used. Further, if necessary, paraform can be used in combination. The formaldehyde is preferably used in an amount of 1 to 6 times the total number of moles of the polyoxyalkylene monoamine and the monomer (B) capable of formaldehyde cocondensation. In consideration of economy, ease of the condensation reaction, and the like, it is more preferable to use 1.5 to 4 moles.
The formaldehyde co-condensation reaction is carried out by an ordinary method in the range of pH 4 to 12, that is, from a weakly acidic region to a basic region.
The formaldehyde may be added in advance in the reactor or may be added dropwise during the reaction.

The composition of the compound constituting the dispersion stabilizer for carbonaceous powder slurry (hereinafter simply referred to as dispersion stabilizer) in the present invention is important. That is, the molar ratio of polyoxyalkylene monoamine (A): monomer capable of co-condensing polyoxyalkylene monoamine (A) with formaldehyde (B): compound forming a sulfone group (C): formaldehyde is (0. 005-0.5): 1:
(0.1-4): (1-6) is preferred. More preferably, (0.01-0.35): 1: (0.
3-2): (1.5-4) is preferred.

The amount of the dispersion stabilizer in the present invention varies depending on the type of the carbonaceous powder, but is generally preferably 0.05 to 3.0% by weight based on the carbonaceous powder.
More preferably, the content is 0.5 to 2.0% by weight.

The dispersion stabilizer of the present invention may be used alone or in combination with one or more other known dispersants. Other known dispersants include, for example, naphthalene sulfonic acid formaldehyde condensate (hereinafter, referred to as naphthalene-based), melamine sulfonic acid formaldehyde polycondensate (hereinafter, referred to as melamine-based), lignin sulfonic acid salt (hereinafter, referred to as melamine sulfonic acid salt). Lignin type), polystyrene sulfonate (hereinafter referred to as polystyrene type), polyoxyethylene alkyl phenyl ether, poly (meth) acrylate, polyoxyethylene alkyl ether sulfate, (meth) acrylic acid and vinyl monomer A copolymer salt of (meth) acrylic acid with a vinyl monomer having a polyoxyalkyleneglycol chain in the molecule, hydroxyethanediphosphonate, a nonylphenol condensate ethylene oxide adduct, and a polyethylene polyamine. Of alkylene oxide Pressurized polymer and the like.

Further, the dispersion stabilizer of the present invention can be used in combination with one or more other known water-soluble polymers in order to further improve the dispersion stability. Other known water-soluble polymers include methylcellulose, carboxymethylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose,
Hydroxypropyl methylcellulose, cellulose derivatives such as sulfoethylcellulose alkali metal salts, polyvinyl alcohol and derivatives thereof, starch and derivatives thereof, sodium alginate, casein, xanthan gum, tamarind gum, natural polymers such as guar gum and derivatives thereof, curdlan, Microbial-produced polysaccharides such as β-1,3-glucan and welan gum such as baramylon, high molecular weight copolymers of acrylic acid or unsaturated polybasic acid with other vinyl monomers, polyacrylamide or acrylamide and other High molecular weight products of copolymers with a vinyl monomer are exemplified.

The dispersion stabilizer of the present invention imparts excellent fluidity to the carbonaceous powder slurry, maintains the dispersion stability without forming a hard pack over a long period of time, and makes it possible to increase the concentration of the slurry. Although the reason is not clear, it is speculated as follows. That is, since the dispersion stabilizer of the present invention has a sulfone group in the molecule, its electric repulsion enhances the dispersibility of the carbonaceous fine particles. Further, when the dispersion stabilizer of the present invention is adsorbed on the carbonaceous fine particles, it is considered that the polyoxyalkylene group contained in the molecule extends to the outside of the particles. A hydration layer is formed around the polyoxyalkylene group extending outward, and it is expected that the steric hindrance effect will keep the dispersibility of the carbonaceous fine particles for a long time and will not cause a hard pack. .

The dispersion stabilizer of the present invention will be described in more detail in the following examples, but the present invention is not limited thereto. In addition, all percentages or parts described below as units of numerical values are% by weight or parts by weight unless otherwise specified.

[0024]

【Example】

Table 1 shows the physical property values of the polyoxyalkylene monoamines used in the present invention. As a representative polyoxyalkylene monoamine, San Techno Chemical Co., Ltd.
JEFFAMINE M series was used. In the following, when these compounds are described, each compound is simply referred to as M-
600, M-1000, M-2005, and M-2070.

[0025]

[Table 1] * 1 PO / EO is the ratio of propylene oxide to ethylene oxide contained in the molecule. * 2 The molecular weight is the molar weight average molecular weight.

Production Example 1 Melamine 0.67 mol (84.4 parts), 37% formaldehyde 3.33 mol (270.0 parts), water 171.0
The portion was charged into a four-necked flask equipped with a stirrer, thermometer, reflux tube, and dropping funnel, and mixed by stirring. After the temperature was raised to 65 ° C., the pH was adjusted to 11.1 with a 25% aqueous sodium hydroxide solution.
5, and reacted at 65 ° C. for 1 hour. Add urea 0.1
3 mol (7.8 parts) was added, and the mixture was further reacted at 70 ° C. for 1 hour. Next, 214.8 parts of water are charged and 45
After cooling to 0 ° C., 0.2 mol of phenol (18.8
) Using a dropping funnel over 30 minutes. After completion of the charging, the reaction was carried out at 60 ° C. for 1 hour. Then, M-100
0.03 mol (33.3 parts) and 0.53 mol (55.1 parts) of anhydrous sodium bisulfite.
Allowed to react for hours. After cooling to 60 ° C, the pH was adjusted to 6.0 with 40% sulfuric acid, the temperature was raised to 65 ° C, and the reaction was performed. When the viscosity of the reaction solution reached 50 cp / 25 ° C, neutralization was performed with a 25% aqueous sodium hydroxide solution. To stop the reaction, 45c
A product with a p / 25 ° C. was obtained. The obtained product was designated as co-condensate 1. Table 2 shows the composition and physical properties.

Production Example 2 625.8 parts of water and 3.0 mol (243.2 parts) of 37% formaldehyde were mixed with a stirrer, a thermometer and a reflux tube.
The mixture was charged in a one-necked flask and mixed with stirring. In this flask, 0.6 mol (75.6 parts) of melamine, 0.1 mol (6.0 parts) of urea and 0.3 mol (51.9 parts) of sulfanilic acid were used.
Parts), 0.4 mol of sodium pyrosulfite (76.0
Parts) and M-2070 were added with stirring at 0.06 mol (120.0 parts). This was heated to 75 ° C., and after confirming that it became a transparent liquid, it was adjusted to pH 11 with a 25% aqueous sodium hydroxide solution and reacted at 75 ° C. for 2 hours.
After confirming that the free sulfite ion has disappeared,
Cooled to 60 ° C. Next, the pH was adjusted to 6.0 with 40% sulfuric acid, and the reaction was allowed to proceed at 60 ° C.
When the temperature reached 25 ° C, the reaction was stopped by neutralizing with a 25% aqueous sodium hydroxide solution to obtain a product of 45 cp / 25 ° C. The obtained product was designated as cocondensate 2. Table 2 shows the composition and physical properties.

Production Example 3 553.1 parts of water and 3.33 mol (270.0 parts) of 37% formaldehyde were mixed with a stirrer, a thermometer and a reflux tube.
The mixture was charged in a one-necked flask and mixed with stirring. Into this flask, 1.0 mol (126.0 parts) of melamine and 0.3 mol (180.0 parts) of M-600 are added under stirring. This was heated to 70 ° C., and after confirming that it became a transparent liquid, it was adjusted to pH 11 with a 25% aqueous sodium hydroxide solution and reacted at 70 ° C. for 1 hour. Next, it is cooled to 55 ° C., and anhydrous sodium bisulfite 0.7 mol (72.8 parts)
Was added. Although the internal temperature increased by the addition of anhydrous sodium bisulfite, the temperature was further increased to 80 ° C. The reaction was continued at 80 ° C., and after confirming that free sulfite ions had disappeared, the mixture was cooled to 60 ° C. Next, p with 40% sulfuric acid
The reaction was proceeded at 60 ° C., and when the viscosity of the reaction solution reached 150 cp / 25 ° C., the reaction was neutralized with a 25% aqueous sodium hydroxide solution to stop the reaction.
A product at 25 ° C. was obtained. The obtained product was designated as co-condensate 3. Table 2 shows the composition and physical properties.

Production Example 4 100.0 parts of water and 1.2 mol (97.3 parts) of 37% formaldehyde were charged into a four-necked flask (A) equipped with a stirrer, a thermometer and a reflux tube, and stirred and mixed. In this flask (A), 0.6 mol (75.6 parts) of melamine, M-
1000 are added under stirring 0.05 mol (50.0 parts). This was heated to 70 ° C., and after confirming that a transparent liquid was obtained, p was added with a 25% aqueous sodium hydroxide solution.
H11 and reacted at 70 ° C. for 1 hour. Next, the mixture was cooled to 55 ° C., and 0.5 mol of anhydrous sodium bisulfite (52.
0 parts). Although the internal temperature increased by the addition of anhydrous sodium bisulfite, the temperature was further increased to 80 ° C. 80
The reaction was continued at ℃, and after confirming that free sulfite ion had disappeared, it was cooled to 60 ℃. Similarly, water 1
00.0 parts, 37% formaldehyde 0.8 mol (6
4.9 parts) was charged into a four-necked flask (B) equipped with a stirrer, a thermometer, and a reflux tube, mixed with stirring, and adjusted to pH 8 with a 25% aqueous sodium hydroxide solution. 0.4 mol (69.2 parts) of sulfanilic acid is added to this flask (B) with stirring. This was heated to 70 ° C., and after confirming that it became a transparent liquid, it was adjusted to pH 11 with a 25% aqueous sodium hydroxide solution and reacted at 70 ° C. for 1 hour. Next, the contents of these flasks (A) and (B) were previously added to 267.6 water.
A four-necked flask (C) equipped with a stirrer, a thermometer, and a reflux tube is charged and stirred and mixed. The flask (C) was adjusted to pH 6.0 with 40% sulfuric acid, and the reaction was allowed to proceed at 60 ° C. When the viscosity of the reaction solution reached 25 cp / 25 ° C, the reaction was neutralized with a 25% aqueous sodium hydroxide solution to carry out the reaction. Stopped to give 20 cp / 25 ° C. product. The obtained product was designated as cocondensate 4. Table 2 shows the composition and physical properties.
Shown in

Production Examples 5 to 6 Co-condensation was attempted in the same manner as in Production Example 1 except that the composition of the compound and the reaction termination viscosity were changed as shown in Table 2. As a result, co-condensates 5 to 6 were obtained.

Production Examples 7 and 8 Co-condensation was attempted in the same manner as in Production Example 2 except that the composition of the compound and the reaction stopping viscosity were changed as shown in Table 2. As a result, co-condensates 7 to 8 were obtained.

Production Examples 9 to 10 Co-condensation was attempted in the same manner as in Production Example 3 except that the composition of the compound and the reaction termination viscosity were changed as shown in Table 2. As a result, co-condensates 9 to 10 were obtained.

Production Examples 11 to 12 Co-condensation was attempted in the same manner as in Production Example 4, except that the composition of the compound and the reaction termination viscosity were changed as shown in Table 2. As a result, co-condensates 11 to 12 were obtained.

Production Examples 13 to 15 Co-condensation was attempted in the same manner as in Production Example 1 except that the composition of the compound and the reaction termination viscosity were changed as shown in Table 2. As a result, co-condensates 13 to 15 were obtained.

[0035]

[Table 2]

Example 1 As described below, a water slurry of coal powder and a water slurry of oil coke powder were prepared using the co-condensate 1 synthesized in Production Example 1 as a carbonaceous powder slurry. The dispersion stability was evaluated. Table 3 shows the results.

1. Preparation of Carbonaceous Powder Slurry Coal used was Australian coal containing 95% of 200 mesh passes. A predetermined amount of the dispersion stabilizer of the present invention, or a comparative dispersion stabilizer, or a comparative dispersant is put in water in advance, and a predetermined amount of coal powder is gradually added thereto, and dispersed with a homomixer at 3000 rpm for 25 minutes. hand,
It was a coal slurry. Oil coke was obtained by coarsely pulverizing an oil coke mass obtained from Ube Ammonia Industry Co., Ltd. with a jaw crusher, and then pulverizing with a Nara free pulverizer to obtain a 50% particle size of 27 μm and a 90% particle size of 95 μm. . This was used as an oil coke slurry in the same manner as the coal slurry.

2. Evaluation of Fluidity The carbonaceous powder slurry obtained by the above preparation method was heated to a predetermined temperature, and the viscosity was measured with a Brookfield viscometer. The viscosity was measured 7 days later.

3. Evaluation of dispersion stability After preparing the carbonaceous powder slurry, the slurry was transferred to a 100 cc polycup so that the height of the slurry was 45 mm from the bottom. Using a bigger needle specified in JIS R5201, the drop distance of the needle for 10 seconds by its own weight was measured. Further, the slurry that had been allowed to stand for 7 days was measured to be used as an index of dispersion stability. Incidentally, the shorter the falling distance, the lower the dispersion stability.

Examples 2 to 12 The same tests as in Example 1 were conducted except that the cocondensates 2 to 12 obtained in Production Examples 2 to 12 were used. The results are shown in Table 3.

Comparative Examples 1 to 3 The same tests as in Example 1 were performed except that the cocondensates 13 to 15 obtained in Production Examples 13 to 15 were used. Table 3 shows the results
Shown in

Comparative Examples 4 to 7 Commercially available Melflow 40 (Mitsui Toatsu Chemical Co., Ltd .: melamine type) and Mighty 150 as dispersants for comparison and control.
(Kao Corporation: naphthalene-based), Glarion (Lion Corporation: polystyrene-based), WESCHEM Na-1
(Georgia Pacific Co., Ltd .: lignin system) was used to perform the same operation as in Example 1. Table 3 shows the results.

[0043]

[Table 3]

[0044]

As is clear from the examples and comparative examples, the dispersion stabilizer for carbonaceous powder obtained according to the present invention shows a high dispersing effect at a low addition amount as compared with existing dispersants, And it has excellent dispersion stability. In other words, it is possible to easily increase the concentration of the slurry, and significant advantages such as an increase in heat generation, a reduction in transportation cost, and an improvement in storability are expected.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshihiko Tomita 7-1-1, Hikoshimasako-cho, Shimonoseki-shi, Yamaguchi Pref.

Claims (11)

[Claims] 1. A polyoxyalkylene monoamine (A) represented by the following formula (I), a monomer (B) capable of co-condensing polyoxyalkylene monoamine (A) with formaldehyde, and a compound capable of forming a sulfone group A dispersion stabilizer for carbonaceous powder slurries comprising a formaldehyde co-condensate with (C). Formula (I) R ₁ O— (AO) _m (BO) _n —R ₂ —NH ₂ where R ₁ , R ₂ : alkyl group having 1 to 5 carbon atoms AO, BO: 2 to 5 carbon atoms Oxyalkylene groups AO and BO are block and / or random m, n: an integer of 0 to 100. However, 100 ≧ m + n ≧ 4 2. Compound (C) which produces a sulfone group
The dispersion stabilizer for a carbonaceous powder slurry according to claim 1, wherein the dispersion stabilizer comprises one or more compounds selected from the group consisting of sodium sulfite, sodium bisulfite, sodium pyrosulfite, fuming sulfuric acid, and sulfur dioxide. 3. A monomer (B) capable of co-condensing polyoxyalkylene monoamine (A) with formaldehyde.
Is one or more compounds selected from the group consisting of melamine or a derivative thereof, phenol or a derivative thereof, urea or a derivative thereof, aminobenzenesulfonic acid or a derivative thereof, and alkylaminobenzenesulfonic acid or a derivative thereof. Item 4. The dispersion stabilizer for a carbonaceous powder slurry according to Item 1. 4. The dispersion stabilizer for a carbonaceous powder slurry according to claim 3, wherein the melamine or a derivative thereof is represented by the following general formula (II). General formula (11) 5. The dispersion stabilizer for a carbonaceous powder slurry according to claim 3, wherein the phenol or a derivative thereof is represented by the following general formula (III). General formula (Ill) 6. The dispersion stabilizer for a carbonaceous powder slurry according to claim 3, wherein the urea or a derivative thereof is represented by the following general formula (IV). General formula (IV) 7. The dispersion stabilizer for a carbonaceous powder slurry according to claim 3, wherein the aminobenzenesulfonic acid or a derivative thereof or the alkylaminobenzenesulfonic acid or a derivative thereof is represented by the following general formula (V). General formula (V) 8. A monomer (B) capable of co-condensing polyoxyalkylene monoamine (A) with formaldehyde.
Is a melamine, The dispersion stabilizer for carbonaceous powder slurries according to claim 3. 9. A monomer (B) capable of co-condensing polyoxyalkylene monoamine (A) with formaldehyde.
The dispersion stabilizer for a carbonaceous powder slurry according to claim 3, wherein is a phenol. 10. A monomer (B) capable of co-condensing polyoxyalkylene monoamine (A) with formaldehyde.
Is the dispersion stabilizer for carbonaceous powder slurry according to claim 3. 11. A monomer (B) capable of co-condensing polyoxyalkylene monoamine (A) with formaldehyde.
4. The dispersion stabilizer for a carbonaceous powder slurry according to claim 3, wherein is a sulfanilic acid.