KR102070836B1 - Additive improving powder fluidity - Google Patents

Abstract

The present invention relates to an additive for improving fluidity of powder. More specifically, the present invention relates to an additive for improving fluidity of powder, which effectively absorbs moisture present in a powdery raw material to prevent aggregation while improving fluidity. To this end, the additive comprises an anionic superabsorbent resin, polymer waxes and talc particles.

Description

ADDITIVE IMPROVING POWDER FLUIDITY

The present invention relates to an additive for improving powder flow. More specifically, the present invention relates to an additive for improving powder flow that effectively absorbs moisture present in powdery raw materials to prevent aggregation and improve fluidity.

Powdered raw materials used in various industrial fields, such as petroleum cokes or coal used in thermal power plants, have high hygroscopicity, and their moisture removal treatment is very important in the process.

Specifically, petroleum coke is used in the form of a powder pulverized using a pulverizer in order to increase the fuel efficiency, which has a lot of pores and has a characteristic that the internal moisture is difficult to easily escape.

Accordingly, when absorbing moisture in the air due to the rainy season or high humidity environment, the cohesion and adhesion between the petroleum coke particles is stronger, causing a problem of being entangled with each other. In addition, as petroleum coke containing moisture is introduced into the feed pipe, the petroleum coke easily adheres to the feed pipe inner shaft pipe portion and accumulates, and thus, the efficiency of the incinerator is significantly reduced and the stability is lowered.

The higher the moisture content, the poorer the coal. High moisture, low quality coal causes blockages in coal handling equipment, such as coal transportation equipment, screens, grinders, feeders, etc., causing disruption of power generation operations. In addition, there is a problem that the boiler thermal efficiency is reduced by incomplete combustion and latent heat loss when burning it. In particular, in a circulating fluidized bed power plant, coal is transported at room temperature and injected into an in-pile. Since high-quality low-quality coal causes clogging of coal handling equipment, it causes serious problems. The situation is maintained by.

In order to solve the problem caused by the hygroscopicity of the powdered raw materials, the method of burning the powdered raw materials to discharge moisture into the air, but in this case may cause deterioration of the raw materials due to heat, low melting point, sensitive to high temperatures In the case of raw materials, it is difficult to apply these techniques.

In addition, a method of using a hot air drying device or installing a hammer in a coal feeder to remove the aggregated raw material due to moisture is adopted, but this requires adding an additional device or process, which increases the process cost. have.

Accordingly, it is possible to remove moisture quickly and efficiently without causing deterioration of powdery raw materials, and in particular, it is required to develop additives that can be applied to petroleum coke and coal to prevent their aggregation and improve fluidity.

Republic of Korea Patent Publication No. 10-1114522 (2012. 02. 02.)

It is an object of the present invention to provide an additive for improving powder flow that prevents agglomeration of powdery raw materials by absorbing moisture in the air and improves fluidity during transport.

Still another object of the present invention is to provide an additive for improving the flow of powder, which is attached to a powder such as petroleum coke or coal, to prevent it from adhering to the transport pipe or to block the transport pipe and to stably supply the powder.

The present invention for achieving the above object provides an additive for improving powder flow, including an anionic superabsorbent resin and polymer wax.

In one aspect of the present invention, the powder flow improving additive may further include talc particles.

In one embodiment of the present invention, the anionic superabsorbent resin is a multiphase secondary particle formed by agglomeration of a plurality of anionic superabsorbent resin primary particles, and talc particles are formed on the interface of the anionic superabsorbent resin primary particles. Located, and may satisfy the following equation 1 and 2.

[Relationship 1]

500 <D ₂ / D ₁ <2,000

(D ₁ is an average particle diameter of talc particles, and D ₂ is an average particle diameter of a dry state of the anionic superabsorbent polymer.)

[Relationship 2]

2,000 <D ₃ / D ₁ <15,000

(The above D ₁ is the average particle diameter of the talc particles, and D ₃ is the average particle diameter of the anionic superabsorbent resin swelled after absorbing deionized water for 5 minutes in the anionic superabsorbent resin.)

In one embodiment of the present invention, the composite particles may include 5 to 25 parts by weight of talc particles based on 100 parts by weight of anionic superabsorbent polymer.

In one embodiment of the present invention, the talc particles may have an average particle diameter of 1 to 800 nm.

In one embodiment of the present invention, the composite particles are prepared by pulverizing anionic superabsorbent polymer to prepare primary particles; Agitating the talc particles on the surface of the primary particles by stirring the primary particles and the talc particles; And agglomerating a plurality of primary particles to which the talc particles are adsorbed to produce secondary particles.

In one embodiment of the present invention, the anionic superabsorbent resin may be any one or a mixture of two or more selected from an acrylic polymer containing a carboxyl group and salts thereof.

In one aspect of the invention, the weight ratio of the polymer wax and anionic superabsorbent resin may be 1: 2 to 20.

In one aspect of the invention, the polymer wax may be polyethylene wax.

In one embodiment of the present invention, the polyethylene wax may have a softening point of 95 to 110 ℃, the viscosity at 140 ℃ 100 to 300 cps.

In one aspect of the present invention, the powder flow improving additive may further include ion exchange particles having a cation exchange capacity of 30 to 600 meq / 100 g.

In one aspect of the invention, the ion exchange particles are any one or two or more selected from cationic silicates, cationic zeolites, cationic bentonite, cationic kaolinite, cationic dikite, cationic acidic clay and cationic halostones It may be a cationic inorganic particle.

In one aspect of the present invention, the ion-exchangeable particles may comprise 5 to 15 parts by weight based on 100 parts by weight of the additive for improving powder flow.

The additive for improving the flow of powder according to the present invention not only rapidly absorbs the moisture present in the powdery raw material, but also minimizes agglomeration between the additive for improving the powder flow which is swollen by moisture or between the additive and the powdery raw material. It has the effect of improving fluidity.

In addition, the additive for improving the powder flow according to the present invention has an effect of preventing the degradation of the raw material caused by the storage environment and weather conditions by significantly improving the flowability of the powdery raw material.

In addition, the additive for improving powder flow according to the present invention has the effect of preventing the reduction of fluidization rate and the blockage of the transfer pipe due to the absorption of moisture in the air, and securing process stability when transferring the powdery raw material.

1 is a photograph showing the results of agglomeration experiments (a) Example 1, (b) Comparative Example 1) according to the Examples and Comparative Examples of the present invention.
Figure 2 shows a photographic transport measurement tester for measuring the fluidization rate according to an embodiment of the present invention.
3 is a photograph showing a fluidization rate measurement process (a) → (b) → (c) according to an embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, the present invention will be described in more detail with reference to the accompanying examples or embodiments. However, the following specific examples or examples are only one reference for describing the present invention in detail, but the present invention is not limited thereto and may be implemented in various forms.

Also, unless defined otherwise, all technical and scientific terms have the same meanings as commonly understood by one of ordinary skill in the art to which this invention belongs. The terms used in the description in the present invention are only for effectively describing specific embodiments and are not intended to limit the present invention.

Also, the singular forms used in the specification and the appended claims may be intended to include the plural forms as well, unless the context clearly indicates otherwise.

In addition, units used without particular reference in the present specification are based on weight, and for example, a unit of% or ratio means weight percent or weight ratio.

In addition, the molecular weight of a polymer means a weight average molecular weight unless there is another definition in the specification of this invention.

In addition, unless otherwise defined in the present specification, the average particle diameter of the particle means D50 obtained through the particle size analyzer.

In addition, the numerical ranges used in the specification of the present invention are the lower limit and the upper limit, and all values within the range, increments logically derived from the shape and width of the defined range, all limited values, and numerical ranges defined in different forms. It includes all possible combinations of upper and lower bounds.

The present invention relates to an additive for improving powder flow that effectively absorbs moisture present in powdery raw materials to prevent aggregation by moisture and improves fluidity.

Powder flow improving additives according to the present invention include anionic superabsorbent resins and polymer waxes. The additive for improving the flow of powder of the present invention is remarkably excellent in water absorption, and prevents agglomeration of powdery raw materials such as petroleum coke or coal used in thermal power plants, and improves fluidity. The effect of letting is excellent.

As used herein, the term “petroleum coke” includes both solid pyrolysis products of the high boiling hydrocarbon fraction (residual petroleum coke) obtained from petroleum treatment and solid pyrolysis products of tar sand treatment. Raw calcined needles and fluidized bed petroleum coke.

The residue petroleum coke may be derived, for example, by a coking process used to reform heavy oil residues, and the tar sands petroleum coke may be derived, for example, by a coking process used to reform oil sands. May be, but is not limited thereto.

In addition, the term "coal" used in the present invention collectively refers to a dark brown combustible mineral that is altered and produced by the action of heat and pressure after the deposition and buried of the geological age, peat (generally classified according to carbon content) as well as peat, lignite, brown coal, bituminous coal and anthracite, as well as coking coal used for steel and thermal power generation, ie strong coal, partial coal coal, weak coal and Includes all partial weak coals.

In one embodiment of the present invention, the additive for improving the powder flow may further include talc particles, and when using the talc particles together with an anionic superabsorbent resin and polymer wax, compared to using other inorganic particles. The effect which improves the fluidity | liquidity of a powdery raw material aimed at this invention, and gives fast fluidization rate can be achieved more easily.

In one embodiment of the present invention, the anionic superabsorbent polymer is a multiphase secondary particle formed by agglomeration of a plurality of anionic superabsorbent polymer primary particles, and is formed on the interface of the anionic superabsorbent polymer primary particles. Talc particles are located, it may be one of the composite particles satisfying the following formula (1) and (2).

[Relationship 1]

500 <D ₂ / D ₁ <2,000

(D ₁ is an average particle diameter of talc particles, and D ₂ is an average particle diameter of a dry state of the anionic superabsorbent polymer.)

[Relationship 2]

2,000 <D ₃ / D ₁ <15,000

(The above D ₁ is the average particle diameter of the talc particles, and D ₃ is the average particle diameter of the anionic superabsorbent resin swelled after absorbing deionized water for 5 minutes in the anionic superabsorbent resin.)

Specifically, the composite particles may be composite particles formed of polyphase secondary particles formed by agglomeration of a plurality of primary particles in a form in which talc particles are positioned at an interface of the anionic superabsorbent polymer primary particles.

In particular, when the polymer wax of the present invention is used together with the composite particles satisfying the above-described formulas (1) and (2), the water absorption of the additive for improving powder flow is remarkably improved, so that the raw material in powder form, for example, a particle form having hygroscopicity It is excellent in preventing the agglomeration of powdery raw materials such as petroleum coke or coal used in plastic materials, thermal power plants and improving fluidity.

The anionic superabsorbent resin of the present invention is a solid powder form as a superabsorbent polymer (SAP) containing anionic functional groups. It has the property of absorbing water, swelling and gelling instantaneously when entering water. At this time, "swell" refers to the size growth of the anionic superabsorbent resin that occurs while water is absorbed by the anionic superabsorbent resin. The anionic superabsorbent polymer may be obtained by polymerizing one or two or more monomers including anionic functional groups and drying the polymer. The anionic superabsorbent polymer obtained after drying aggregates primary particles of the anionic superabsorbent polymer. In the form of larger secondary particles. In addition, the secondary particles may be pulverized into primary particles using a pulverizer such as a known roll mill or beads mill.

In one embodiment of the present invention, the anionic superabsorbent resin may be any one or a mixture of two or more selected from an acrylic polymer containing a carboxyl group and salts thereof. The anionic superabsorbent resin includes a repeating unit containing a carboxyl group as a functional group in the main chain of the polymer, and specifically, a repeating unit derived from any one or more monomers selected from the group consisting of acrylic acid, methacrylic acid and salts thereof. It may be an acrylic polymer containing. That is, the acrylic acid, methacrylic acid and salts thereof may be polymerized to prepare polyacrylic acid, polymethacrylic acid, polyacrylic acid salts, and polymethacrylate salts, and preferred of the anionic superabsorbent polymer according to the present invention. Can be used as a substance.

In addition, the acrylic acid, methacrylic acid and salts thereof may be polymerized to be used as an acrylic polymer in the form of a homopolymer, but copolymerized with comonomers derived from other monomers such as starch, gelatin, polyhydric alcohols and glycol-based compounds, etc. And may be used in the form of an acrylic copolymer.

Anionic superabsorbent polymer according to an aspect of the present invention is a secondary particle formed by agglomeration of a plurality of primary anionic superabsorbent polymer primary particles, which is insoluble in water, swells by absorbing a large amount of water into the particles, and increases pressure. When added, it may have a property of maintaining a solid form without releasing water.

More specifically, the structure of the composite particle including the anionic superabsorbent polymer and the talc particles of the present invention is that talc particles are located at the interface of the anionic superabsorbent polymer primary particles, and such anionic superabsorbent polymer primary particles are It may consist of a plurality of secondary particles formed by agglomeration of more than one, that is, a plurality of.

In addition, as the composite particles satisfying the following Equations 1 and 2 together with the polymer wax, water is absorbed more quickly than the powdery raw material having hygroscopicity to prevent water absorption of the raw materials, and thereafter absorb water. There is an effect of minimizing aggregation between the swollen anionic superabsorbent resin and the anionic superabsorbent resin and the polymer wax.

[Relationship 1]

500 <D ₂ / D ₁ <2,000

(D ₁ is an average particle diameter of talc particles, and D ₂ is an average particle diameter of a dry state of the anionic superabsorbent polymer.)

[Relationship 2]

2,000 <D ₃ / D ₁ <15,000

(The above D ₁ is the average particle diameter of the talc particles, and D ₃ is the average particle diameter of the anionic superabsorbent resin swelled after absorbing deionized water for 5 minutes in the anionic superabsorbent resin.)

In relation 2, when 1 g of the anionic superabsorbent resin is immersed in deionized water for 5 minutes, the deionized water may be swelled by absorbing deionized water 100 to 500 times, specifically 300 to 500 times, based on the weight of the anionic superabsorbent resin. May be, but is not limited thereto.

In addition, the relational expression 1 may specifically satisfy 800 to 1,500, more specifically 1,000 to 1,300, and the relational expression 2 may specifically satisfy 5,000 to 12,000, more specifically 7,000 to 10,000, but is not limited thereto. It doesn't happen. When using the composite particles satisfying the relations 1 and 2 at the same time within the above range, the water absorption of the additive for improving the powder flow and the effect of preventing the aggregation of powdery materials such as petroleum coke or coal is particularly improved. . In particular, even when stored in an environment with high humidity, it is possible to provide high quality powdery raw materials without agglomeration and quality deterioration between the powdery raw materials, and in the aspect of reducing the fluidization rate due to moisture absorption and preventing clogging of the transfer pipe even during transportation. effective.

In one aspect of the invention, the average particle diameter of the anionic superabsorbent resin may be 100 to 1,000 μm, specifically 150 to 850 μm, more specifically 300 to 700 μm, but is not limited thereto.

In addition, the talc particles may have an average particle diameter of 1 to 800 nm, specifically 5 to 600 nm, more specifically 10 to 500 nm, by using the talc particles in the above range in combination with an anionic superabsorbent polymer. And as prepared by the composite particles satisfying the relation 2, the relation 1 and the relation 2 can be satisfied effectively. In particular, by using the talc particles having the average particle size range, talc particles can be more effectively and uniformly distributed on the interface of the anionic superabsorbent polymer primary particles, it is possible to significantly improve the swelling degree of the composite particles produced .

In one embodiment of the present invention, the composite particles may be that containing 1 to 40 parts by weight, specifically 2 to 30 parts by weight, more specifically 5 to 25 parts by weight of talc particles based on 100 parts by weight of the anionic superabsorbent polymer However, it is not limited thereto. By using the talc particles in the above range at the interface of the anionic superabsorbent polymer primary particles, the moisture absorption amount of the composite particles to be produced is maximized, and the effect of imparting fluidization to the powdery raw material is excellent, and the transportability of the raw materials and Significantly improve the fluidization rate.

Method for producing a composite particle according to an aspect of the present invention comprises the steps of preparing the primary particles by grinding the anionic superabsorbent resin; Agitating the talc particles on the surface of the primary particles by stirring the primary particles and the talc particles; And aggregating a plurality of primary particles to which the talc particles are adsorbed to produce secondary particles.

Specifically, the composite particles according to the aspect of the present invention, after swelling the anionic superabsorbent resin pulverized into primary particles in water, adding and stirring talc particles to adsorb the talc particles on the surface of the primary particles, It may be dried to prepare a multi-phase secondary particles formed by agglomeration of a plurality of primary particles. More specifically, for example, a monomer containing an anionic functional group is polymerized and dried to prepare an anionic superabsorbent resin composed of polyphase secondary particles formed by agglomeration of the anionic superabsorbent resin primary particles. After the prepared anionic superabsorbent resin is pulverized into primary particles having an average particle diameter of 10 μm or less using a pulverizer such as a known roll mill or beads mill, and then poured into water and swollen, Talc particles are added and stirred. Through this, talc particles may be effectively adsorbed on the surface of the swollen anionic superabsorbent polymer primary particles through electrostatic interaction. Thereafter, by drying it, it is possible to prepare anionic superabsorbent polymer in which a plurality of anionic superabsorbent resin primary particles are aggregated, wherein talc particles are physically adsorbed on the surface of primary particles, but are limited to the above-mentioned manufacturing method. It is not.

The polymer wax of the present invention can push the water in the direction of the composite particles in the space between the powdery raw material, it is possible to prevent the viscosity rise of the additive for improving the powder flow due to water absorption. The polymer wax may preferably have a weight average molecular weight of 500 to 50,000 g / mol, more specifically 1,000 to 20,000 g / mol, but is not limited thereto.

Specific examples of the polymer wax include polyethylene wax, polypropylene wax, polytetrafluoroethylene wax, polytetrafluoroethylene / polyethylene wax, and the like. It may be one or a mixture of two or more selected from polyethylene / amide wax, but is not limited thereto.

In one aspect of the invention, the polymer wax may be to use a polyethylene wax having a weight average molecular weight of 500 to 50,000 g / mol, more specifically 1,000 to 20,000 g / mol, but is not limited thereto.

In particular, when the polyethylene wax is used in combination with the composite particles, the moisture absorption rate of the composite particles is not only improved, but the effect of maintaining high fluidity by lowering the viscosity of the swollen composite particle surface is excellent.

In addition, the polyethylene wax of the present invention may have a softening point of 95 to 110 ℃, a viscosity at 140 ℃ 100 to 300 cps, specifically a softening point of 100 to 108 ℃, the viscosity at 140 ℃ 130 to 250 cps have. When polyethylene wax having a softening point and viscosity in the above range is used together with the composite particles, the swelling property and the rate of water absorption of the composite particles are further improved and more effective in absorbing a large amount of moisture at a high speed.

In particular, with the use of the polyethylene wax, the multiparticulates exhibit a high water absorption rate, specifically, having an excellent absorption rate of 0.01 to 3 mL / sec, more specifically 0.1 to 1 mL / sec, but not limited thereto.

In addition, the average particle diameter of the polymer wax may be 0.1 to 100 μm, specifically 10 to 50 μm, but is not limited thereto.

In one aspect of the invention, the weight ratio of the polymer wax and the composite particles may be 1: 2 to 20, specifically 1: 4 to 10, but is not limited thereto. When preparing an additive for improving powder flow using a polymer wax and an anionic superabsorbent resin, preferably a polymer wax and a composite particle having a weight ratio in the above range, the effect of preventing viscosity rise due to moisture absorption is significantly increased. As a result, excellent long-term storage stability is imparted to the powdery raw material, and it is effective because the feed tube can be quickly passed stably without aggregation and adsorption even during transfer.

In one aspect of the present invention, the powder flow improving additive may further include ion exchange particles. The ion-exchangeable particles may have cations exchangeable with water molecules and have a cation exchange capacity (CEC) of 30 to 600 meq / 100 g, specifically 50 to 500 meq / 100 g, but are not limited thereto. It doesn't happen. In the case of including the ion-exchangeable particles having a cation exchange capacity in the above range, the dispersibility of the additive for improving the powder flow is improved, and it is very effective to further improve the fluidity of the raw material by minimizing the aggregation between powdery raw materials.

The ion-exchange particles may be cationic inorganic particles, specifically, for example, in cationic silicates, cationic zeolites, cationic bentonites, cationic kaolinite, cationic dicatetes, cationic acidic clays and cationic halostones. It may be any one or two or more cationic inorganic particles selected, but is not limited thereto. In addition, the cation may be any one or two or more cations selected from sodium, calcium, aluminum, magnesium, iron, zinc, chromium, titanium, palladium, germanium and gallium, but is not limited thereto.

In particular, when sodium type bentonite (Na-bentonite) or zeolite (Na-zeolite) is used as the ion-exchangeable particles together with the composite particles and polyethylene wax of the present invention, the water adsorption power and the maximum swelling degree of the additive for improving the powder flow The effect is further improved. Specifically, the ion exchange particles are inorganic particles having a layered structure in which interlayer cations exist, and as the water molecules are absorbed, exchange reactions with cation ions in the ion exchange particles occur, volume swells, and excellent absorption ability. Indicates.

The ion-exchangeable particles may have an average particle diameter of 1 to 300 μm, specifically 10 to 150 μm, and include 1 to 30 parts by weight, specifically 5 to 15 parts by weight, based on 100 parts by weight of the additive for improving powder flow. It may be, but is not limited thereto.

In addition, the additive for improving powder flow of the present invention may further include inorganic particles in order to further improve the fluidity of the powdery raw material. Examples of the inorganic particles include silicon oxide (SiO ₂ ), titanium oxide (TiO ₂ ), aluminum oxide (Al ₂ O ₃ ), zinc antimonate (ZnSb ₂ O ₆ ), zinc oxide (ZnO), and antimony oxide. (Sb ₂ O ₅ ), niobium oxide (Nb ₂ O ₃ ), yttrium oxide (Y ₂ O ₃ ), tin oxide (SnO ₂ ), zirconium oxide (ZrO ₂ ), etc. May be, but is not limited thereto. The inorganic particles may have an average particle diameter of 1 to 200 μm and may be added in an amount of 1 to 20 parts by weight based on 100 parts by weight of the total powder flow improving additive, but is not limited thereto.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the following Examples and Comparative Examples are only examples for explaining the present invention in more detail, the present invention is not limited by the following Examples and Comparative Examples.

(evaluation)

(1) cohesion

Insert the test sample into the test cylinder (height 210mm, diameter 60mm), chop the sample with the compaction rod, remove the locking device installed on the side of the test cylinder, and confirm that the cylindrical shape of the test sample is maintained when the cylinder is removed. , If the form is maintained, x is indicated if the form is not maintained. At this time, the compaction process was to be about 35% of the total height of the cylinder when the sample was completely filled after filling the cylinder.

(2) fluidization rate

Using the feed measurement tester of FIG. 2, the feed rate was measured as in FIG. 3. The feed measurement tester used an input angle of 51 ° based on the inner bottom. The amount of the sample introduced into the transport measuring tester was measured by dividing the time taken by all samples to pass out of the tester.

[Production example]

Polyacrylates having an average particle size of 450 μm were pulverized using a roll mill to prepare polyacrylate primary particles having an average particle size of 5.0 μm. Subsequently, the pulverized polyacrylate primary particles were added to water and stirred for 5 minutes to swell, and then 15 parts by weight of talc having an average particle diameter of 450 nm was added to 100 parts by weight of the polyacrylate. After stirring for 10 minutes to adsorb the talc particles on the surface of the polyacrylate primary particles, the precipitate was taken out and completely dried to prepare a composite particle agglomerated primary particles were placed on the surface of the adsorbed talc particles. As a result of observing the prepared composite particles under a microscope, it was confirmed that the polyacrylic acid primary particles having talc particles on the surface were made of multiphase secondary particles formed by agglomeration, and the particle size analyzer (HORIBA, LA-950 Laser Particle) As a result of analyzing the average particle diameter (D50) of the composite particles through the Size Analyzer), it was confirmed that the size is 585 μm.

In addition, the prepared composite particles were immersed in deionized water for 5 minutes and then taken out, and the size of the swollen superabsorbent polymer was analyzed. As a result, the average particle diameter was 3,150 µm.

Through this, it was confirmed that the D ₂ / D ₁ value of the relation 1 is 1,300, and the D ₃ / D ₁ value of the relation 2 is 7,000.

Comparative Production Example

100 parts by weight of polyacrylate having an average particle diameter of 450 μm and 15 parts by weight of talc having an average particle diameter of 450 nm were mixed with a mixer to prepare mixed particles.

Example 1

Petroleum coke passing through a 5.6 mm sieve was completely dried in a 110 ° C. dryer for 24 hours. Wet petroleum coke was prepared by adding 10 g of distilled water to 50 g of dried petroleum coke.

Subsequently, 10 g of polyethylene wax (average particle diameter: 25 μm) having a softening point of 103 ° C. and a viscosity of 180 cps and 90 g of polyacrylate having an average particle diameter of 450 μm were added to a blender and mixed to improve powder flow. Was prepared. Subsequently, after mixing and mixing the prepared powder flow improving additive into wet petroleum coke, the degree of aggregation and fluidization rate were evaluated, and the results are shown in Table 1. In addition, it was confirmed through the results of FIG.

Example 2

In Example 1, the cohesiveness and fluidization rate were evaluated in the same manner except that 13.5 g of talc particles having an average particle diameter of 450 nm were further added when preparing an additive for improving powder flow, and the results are shown in Table 1. .

Example 3

In Example 1, the cohesiveness and fluidization rate were evaluated in the same manner except that the polyacrylate was replaced with the composite particles of Preparation Example, and the results are shown in Table 1. In addition, the evaluation of the degree of cohesion confirmed that the cylindrical shape of the test sample was not maintained and easily collapsed, and that there was no residue left on the side of the cylinder.

Example 4

In Example 3, 10 parts by weight of Na-bentonite (Donghae Chemical Co., Ltd.) having a cation exchange capacity of 63.9 meq / 100 g was added thereto to prepare an additive for improving powder flow. The fluidization rate was evaluated and the results are shown in Table 1. In addition, the evaluation of the cohesiveness confirmed that the cylindrical shape of the test sample was not easily maintained and collapsed easily, and there was no residue left on the cylinder side, and the collapsed and remaining height of the petroleum coke for the entire height of the cylinder was the lowest.

Comparative Example 1

Except not using a polyethylene wax in Example 1 was carried out in the same manner to evaluate the cohesion and fluidization rate, the results are shown in Table 1. In addition, the results of Figure 1 (b), it was confirmed that the cylindrical shape of the test sample is maintained as it is not easy to fluidize.

Comparative Example 2

The cohesiveness and fluidization rate were evaluated in the same manner as in Example 1 except that the polyethylene wax was replaced with polyethylene (LUTENE CB2030 ^® , LG Chemical) having a softening point of 125 ° C. and a weight average molecular weight of 105,000 g / mol. The results are shown in Table 1.

Comparative Example 3

Except for replacing the polyethylene wax in Example 1 with polydimethylsiloxane (sigma-aldrich) having a weight average molecular weight of 95,000 g / mol was carried out in the same manner to evaluate the cohesion and fluidization rate, the results are shown in Table 1 Described.

[Comparative Example 4]

Except for replacing the polyethylene wax in Example 1 with polystyrene (sigma-aldrich) having a weight average molecular weight of 192,000 g / mol was carried out in the same manner to evaluate the cohesion and fluidization rate, the results are shown in Table 1 .

[Comparative Example 5]

The cohesion and fluidization rate were evaluated in the same manner as in Example 1 except that the polyethylene wax was replaced with polymethyl methacrylate (sigma-aldrich) having a weight average molecular weight of 350,000 g / mol. It described in 1.

division Agglomeration Feed rate (g / sec) Example 1 ○ 646 Example 2 ○ 668 Example 3 ○ 685 Example 4 ○ 699 Comparative Example 1 × 423 Comparative Example 2 × 409 Comparative Example 3 × 386 Comparative Example 4 × 374 Comparative Example 5 × 367

As shown in Table 1, Examples 1 to 4 has a low aggregation degree compared to Comparative Examples 1 to 5, it was confirmed that the transfer speed of the sample is fast.

Specifically, Examples 1 to 4 show excellent flowability without agglomeration of wet petroleum coke, while Comparative Examples 1 to 5 maintained the cylindrical form of the sample and took a long time to exit the transfer measuring tester. Was found to be relatively low.

Claims (8)

Anionic superabsorbent resins, polymer waxes and talc particles,
The polymer wax is polyethylene wax,
The polyethylene wax has a softening point of 95 to 110 ° C, a viscosity at 140 ° C of 100 to 300 cps,
The anionic superabsorbent resin is a multiphase secondary particle formed by agglomeration of a plurality of primary anionic superabsorbent polymer primary particles, and the talc particles are positioned at an interface of the anionic superabsorbent polymer primary particles, And additives for improving powder flow which are composite particles satisfying relation 2.
[Relationship 1]
500 <D2 / D1 <2,000
(D1 is an average particle diameter of talc particles, and D2 is an average particle diameter of a dry state of the anionic superabsorbent polymer.)
[Relationship 2]
2,000 <D3 / D1 <15,000
(The above D1 is the average particle diameter of the talc particles, and D3 is the average particle diameter of the swelled anionic superabsorbent resin after absorbing deionized water for 5 minutes in the anionic superabsorbent resin.) delete delete The method of claim 1,
The anionic superabsorbent resin is any one or a mixture of two or more selected from an acrylic polymer containing a carboxyl group and salts thereof. The method of claim 1,
The weight ratio of the polymer wax and anionic superabsorbent resin is 1: 2 to 20 additives for improving powder flow. delete delete The method of claim 1,
The additive for improving the powder flow may be any one or two or more ion-exchangeable particles selected from cationic silicates, cationic zeolites, cationic bentonites, cationic kaolinite, cationic dicatetes, cationic acidic clays and cationic halostones. An additive for improving powder flow comprising.

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