KR101515780B1 - Method for preparing thermoplastic resin powder having excellent flocculation resistance - Google Patents

Abstract

An embodiment of the present invention provides a method of preparing thermoplastic resin powder comprising the steps of: (a) injecting, into a reactor, rubber-modified graft copolymer latex, 0.1-2.0 parts by weight of anti-oxidant, 1-10 parts by weight of salting out agent, and 120-200 parts by weight of water with respect to 100 parts by weight of solid rubber-modified graft copolymer latex, to generate rubber-modified graft copolymer powder; and (b) simultaneously injecting ethylene bis stearamide (EBS) into the reactor to mature and collect the rubber-modified graft copolymer powder.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a thermoplastic resin powder having excellent cohesion resistance,

The present invention relates to a method for producing a thermoplastic resin powder, and more particularly, to a method for producing a thermoplastic resin powder, which comprises an acrylonitrile-butadiene-styrene (ABS) or an acrylate-styrene- acrylonitrile The present invention relates to a method for producing a thermoplastic resin powder which can prevent agglomeration between powders which occurs during long-term storage of a thermoplastic resin powder such as a resin.

In the case of acrylonitrile-butadiene-styrene (ABS) or acrylate-styrene-acrylonitrile (ASA) powders among the thermoplastic resin powders, when storing or transporting by multi- The diffusion of rubber can cause agglomeration between powders, which is called blocking or caking.

Such coagulation phenomenon may cause defective dispersion of the rubber in the matrix when the thermoplastic resin powder is extruded or injected to form a product, which may deteriorate the appearance quality such as mechanical properties, coloring property and gloss of the product.

On the other hand, conventionally, in the production of a thermoplastic resin, calcium carbonate, magnesium carbonate, barium carbonate, calcium sulfate, barium sulfate, lithium phosphate, calcium phosphate, magnesium phosphate, aluminum oxide, calcium of dicarboxylic acid, An anti-blocking agent such as cross-linked polymerized polystyrene particles and cross-linked acrylate particles is administered or a lubricant is administered to reduce the aggregation phenomenon between the rubber particles due to friction with the metal surface of the product molding apparatus, To prevent deterioration of the physical properties of the product.

In particular, Korean Patent No. 10-1263985 relates to a thermoplastic resin composition having excellent heat-resistant coloring property, and it relates to a styrene thermoplastic resin pellet or a powder, which is obtained by adding an ethylene bis stearamide (EBS) as a lubricant and a hydroxyl carboxylic acid And then melt-kneading the thermoplastic resin composition.

However, when an inorganic material or a crosslinked polymer particle is injected in the molding of the product, the aggregation phenomenon of the resin powder itself as a raw material is not essentially suppressed, so that the uniformity of mixing with the resin powder in the product is lowered, , Gloss and the like may be lowered.

Actually, when the resin powder is stored for a long period of time or is shipped and shipped, the agglomeration between the powders accelerates due to external factors such as the weight (pressure), temperature and humidity acting between the powders loaded in the reservoir, Is limited in inhibiting such aggregation phenomenon.

KR 10-1263985 B

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art described above, and it is an object of the present invention to provide an anti-coagulating thermoplastic resin capable of suppressing coagulation phenomena between powder particles, And a method for producing the powder.

In order to achieve the above object, an embodiment of the present invention is a method for producing a thermoplastic resin powder, comprising the steps of: (a) adding a rubber-modified graft copolymer latex to a reactor, a solid content of the rubber-modified graft copolymer latex 0.1 to 2.0 parts by weight of an antioxidant, 1 to 10 parts by weight of a salting agent, and 120 to 200 parts by weight of water to produce a rubber-modified graft copolymer powder; And (b) collectively administering ethylene bis stearamide (EBS) to the reactor to agglomerate and recover the rubber-modified graft copolymer powder, and recovering the thermoplastic resin powder.

In one embodiment, the rubber-modified graft copolymer latex may be one obtained by graft-polymerizing an aromatic vinyl compound and a vinyl cyan compound onto an acrylic or conjugated diene rubber latex.

In one embodiment, the aromatic vinyl compound may be at least one selected from the group consisting of styrene, alpha methyl styrene, alpha ethyl styrene, para methyl styrene, and vinyl toluene.

In one embodiment, the vinyl cyan compound may be at least one selected from the group consisting of acrylonitrile, methacrylonitrile, and ethacrylonitrile.

In one embodiment, the rubber-modified graft copolymer latex is selected from the group consisting of acrylonitrile-butadiene-styrene (ABS) latex or acrylate-styrene-acrylonitrile (ASA) Lt; / RTI >

In one embodiment, the antioxidant may be at least one selected from the group consisting of phenolic, phosphorous, and sulfur ester.

In one embodiment, the salting agent is selected from the group consisting of citrate, edetate, glycolate, phosphate, hydrochloride, sulfate, acetate, tartrate, bromate, oxalate, lactate, carbonate and chloride salts. Or more.

In one embodiment, the amount of the emulsified ethylene bis stearamide (EBS) may be 0.5 to 4 parts by weight based on 100 parts by weight of the solid content of the rubber-modified graft copolymer latex.

In one embodiment, the average particle diameter of the emulsified ethylene bis stearamide (EBS) may be 1.5 to 6 mu m.

In one embodiment, the relationship between Ta and Tb and Ta < = Tb in the reactor in the steps (a) and (b) may be satisfied.

In one embodiment, the Ta may be between 75 and 85 ° C, and the Tb may be between 85 and 95 ° C.

According to one embodiment of the present invention, NBS (N, N-ethylene bis stearamide), which is administered during molding of the final product, is used as a lubricant. During the production process of the thermoplastic resin powder as a raw material, A coating can be induced and the coagulation property of the thermoplastic resin powder thus produced can be improved.

It should be understood that the effects of the present invention are not limited to the above effects and include all effects that can be deduced from the detailed description of the present invention or the configuration of the invention described in the claims.

1 is a schematic view illustrating a method for producing a thermoplastic resin powder according to an embodiment of the present invention.
2 is a schematic view illustrating a method for testing the coagulation resistance of a thermoplastic resin powder produced according to a method for producing a thermoplastic resin powder according to an embodiment of the present invention.
FIG. 3 is a graphical representation of the results of the coagulation test of the thermoplastic resin powder produced according to the method for producing a thermoplastic resin powder according to an embodiment of the present invention.
FIG. 4 shows the result of cohesion test for long-term storage of the thermoplastic resin powder produced according to the method for producing a thermoplastic resin powder according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "indirectly connected" . Also, when an element is referred to as "comprising ", it means that it can include other elements, not excluding other elements unless specifically stated otherwise.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Method for producing thermoplastic resin powder

1 is a schematic view illustrating a method for producing a thermoplastic resin powder according to an embodiment of the present invention.

According to an embodiment of the present invention, there is provided a process for producing a thermoplastic resin powder, comprising the steps of: (a) adding a rubber-modified graft copolymer latex to the reactor, 0.1 to 10 parts by mass of an antioxidant based on 100 parts by mass of the solid content of the rubber-modified graft copolymer latex, 2.0 to 2.0 parts by weight, salting out 1 to 10 parts by weight, and water 120 to 200 parts by weight to obtain a rubber-modified graft copolymer powder; And (b) collectively administering ethylene bis stearamide (EBS) to the reactor to agglomerate and recover the rubber-modified graft copolymer powder, and recovering the thermoplastic resin powder.

In the step (a), an antioxidant and a salting agent are added to the rubber-modified graft copolymer latex to induce flocculation or salting-out reaction, thereby producing a powdery rubber-modified graft copolymer.

As the antioxidant, at least one selected from the group consisting of phenol, phosphorus, and sulfur ester may be used alone or in combination.

The amount of the antioxidant may be 0.1 to 2.0 parts by weight based on 100 parts by weight of the solid content of the rubber-modified graft copolymer latex. If the amount of the antioxidant is less than 0.1 parts by weight, the antioxidant may not provide a thermal stability effect. If the amount of the antioxidant is more than 2.0 parts by weight, economical efficiency may be deteriorated.

The salting agent may be at least one selected from the group consisting of citrate, edetate, glycolate, phosphate, hydrochloride, sulfate, acetate, tartrate, bromate, oxalate, lactate, carbonate and chloride salts Can be mixed.

The amount of the salting agent may be 1 to 10 parts by weight based on 100 parts by weight of the solid content of the rubber-modified graft copolymer latex. If the dose of the salting agent is less than 1 part by weight, aggregation or salting out reaction of the rubber-modified copolymer latex is less likely to occur. If the amount is more than 10 parts by weight, the rubber- The particle size distribution of the modified graft copolymer powder may become uneven and the mechanical properties and appearance quality of the final product may be deteriorated.

The rubber-modified graft copolymer latex may be one obtained by graft-polymerizing at least one of an aromatic vinyl compound and a vinyl cyan compound onto an acrylic or conjugated diene rubber latex.

The aromatic vinyl compound may be at least one member selected from the group consisting of styrene, alphamethylstyrene, alphaethylstyrene, paramethylstyrene, and vinyltoluene, preferably styrene, but is not limited thereto.

The vinyl cyan compound may be at least one member selected from the group consisting of acrylonitrile, methacrylonitrile, and ethacrylonitrile, and may preferably be acrylonitrile, but is not limited thereto.

The rubber-modified graft copolymer latex may be an acrylonitrile-butadiene-styrene (ABS) latex or an acrylate-styrene-acrylonitrile (ASA) latex.

In the step (b), ethylene bis stearamide (EBS) is collectively administered to the reactor to agitate the rubber-modified graft copolymer powder, followed by dehydration and drying to collect the thermoplastic resin powder.

The amount of the emulsified ethylene bis stearamide (EBS) may be 0.5 to 4 parts by weight based on 100 parts by weight of the solid content of the rubber-modified graft copolymer latex.

If the amount of the emulsified EBS is less than 0.5 parts by weight, the anticoagulant property expected to be imparted to the thermoplastic resin powder can not be imparted. If the amount is more than 4 parts by weight, the thermal stability of the thermoplastic resin powder may be deteriorated, have.

Further, as the dose of the emulsified EBS increases within the above range, the coating on the thermoplastic resin powder becomes relatively easy, so that the cohesiveness of the thermoplastic resin powder to be produced can be further improved.

The average particle diameter of the emulsified EBS (ethylene bis stearamide) may be 1.5 to 6 mu m.

If the average particle diameter of the emulsified EBS is less than 1.5 탆, the unit surface area increases as the particle size becomes smaller, so that diffusion into the thermoplastic resin powder may actively occur. However, excessive emulsification of the emulsified EBS or high- The thermal stability can be lowered and the manufacturing cost can be increased. If it exceeds 6 탆, the diffusion into the thermoplastic resin powder can be inhibited, and the coagulation property of the produced powder may be lowered.

Also, as the average particle diameter of the emulsified ethylene bis stearamide (EBS) is smaller within the above range, the surface area of the unit is increased and the coating of the powder is relatively easy, so that the cohesion of the thermoplastic resin powder to be produced can be further improved have.

The relationships between the temperatures of the reactor in the steps (a) and (b) are Ta and Tb, respectively, and Ta < = Tb.

In the step (a), an antioxidant and a salting agent are added to the rubber-modified graft copolymer latex to produce a powdery rubber-modified graft copolymer, wherein the rubber-modified graft copolymer latex It is preferable to maintain the temperature of the reactor at Ta since a sufficient level of heat is required to initiate coagulation or salting out reaction of the coalesced latex.

In the step (b), the emulsion EBS (ethylene bis stearamide) is collectively administered to the reactor to agitate the rubber-modified graft copolymer powder, followed by dehydration and drying to collect the thermoplastic resin powder. It is preferable to increase the temperature of the reactor to Ta or more.

On the other hand, the Ta may be 75 to 85 ° C, and the Tb may be 85 to 95 ° C.

In the step (a), the temperature (Ta) of the reactor may be maintained at 75 to 85 ° C through a heat exchanger. If the temperature Ta is less than 75 ° C, the reaction time may be long due to a low reaction temperature. If the temperature Ta is higher than 85 ° C, it may be difficult to control the process due to excessive reaction heat in the subsequent step.

In the step (b), the temperature (Tb) of the reactor may be raised and maintained at 85 to 95 ° C through a heat exchanger. If the temperature Tb is less than 85 ° C, it is difficult to react the residual reactant in the step (a). If the temperature Tb is higher than 95 ° C, it may be difficult to control the process due to excessive reaction heat in the step of recovering the powder.

Hereinafter, embodiments of the present invention will be described in detail.

Example  One

ASA latex (Kumho XC 100A), which is an intermediate product before the production of the thermoplastic resin powder, was used. The ASA latex is a resin in which 50 wt% of acryl rubber and 50 wt% of styrene and acrylonitrile are grafted or coated, and dispersed in water.

0.6 parts by weight of an antioxidant, 150 parts by weight of pure water and 4 parts by weight of a salting agent were added to 100 parts by weight of the solid content of the ASA latex, and the powder was agglomerated at 82 to 85 ° C.

Thereafter, the emulsion EBS having an average particle diameter of 1.5 탆 was collectively administered in an amount of 4 parts by weight based on 100 parts by weight of the ASA latex solid. The mixture was allowed to stand at 95 DEG C for 5 minutes, washed with water, dehydrated and dried to obtain a thermoplastic resin powder.

Example  2

Except that 2 parts by weight of emulsified EBS having an average particle diameter of 1.5 탆 was collectively administered. In addition, the ingredients and the manufacturing process used in the production of the thermoplastic resin powder were the same as in Example 1.

Example  3

0.5 parts by weight of emulsified EBS having an average particle diameter of 1.5 占 퐉 were collectively administered. In addition, the ingredients and the manufacturing process used in the production of the thermoplastic resin powder were the same as in Example 1.

Example  4

4 parts by weight of emulsified EBS having an average particle diameter of 4.0 占 퐉 were collectively administered. In addition, the ingredients and the manufacturing process used in the production of the thermoplastic resin powder were the same as in Example 1.

Example  5

Except that 2 parts by weight of emulsified EBS having an average particle diameter of 4.0 占 퐉 were collectively administered. In addition, the ingredients and the manufacturing process used in the production of the thermoplastic resin powder were the same as in Example 1. [

Example  6

0.5 parts by weight of emulsified EBS having an average particle diameter of 4.0 占 퐉 were collectively administered. In addition, the ingredients and the manufacturing process used in the production of the thermoplastic resin powder were the same as in Example 1.

Example  7

4 parts by weight of emulsified EBS having an average particle diameter of 6.0 占 퐉 were collectively administered. In addition, the ingredients and the manufacturing process used in the production of the thermoplastic resin powder were the same as in Example 1.

Example  8

2 parts by weight of emulsified EBS having an average particle diameter of 6.0 占 퐉 were collectively administered. In addition, the ingredients and the manufacturing process used in the production of the thermoplastic resin powder were the same as in Example 1. [

Example  9

0.5 parts by weight of emulsified EBS having an average particle diameter of 6.0 占 퐉 were collectively administered. In addition, the components to be added and the manufacturing process of the thermoplastic resin powder were the same as in Example 1.

Comparative Example  One

0.6 parts by weight of an antioxidant, 150 parts by weight of pure water and 4 parts by weight of a salting agent were added to 100 parts by weight of a solid component of ASA latex, and the powder was agglomerated at 82 to 85 캜. The mixture was allowed to stand at 95 DEG C for 5 minutes, washed with water, dehydrated and dried to obtain a thermoplastic resin powder.

Comparative Example  2

And 2 parts by weight of emulsified EBS having an average particle diameter of 1.0 탆 were collectively administered. In addition, the ingredients and the manufacturing process used in the production of the thermoplastic resin powder were the same as in Example 1.

Comparative Example  3

Except that 2 parts by weight of emulsified EBS having an average particle diameter of 6.5 mu m was collectively administered. In addition, the ingredients and the manufacturing process used in the production of the thermoplastic resin powder were the same as in Example 1.

Comparative Example  4

5 parts by weight of emulsified EBS having an average particle diameter of 4.0 占 퐉 were collectively administered. In addition, the ingredients and the manufacturing process used in the production of the thermoplastic resin powder were the same as in Example 1.

Comparative Example  5

0.3 parts by weight of emulsified EBS having an average particle diameter of 4.0 占 퐉 were collectively administered. In addition, the ingredients and the manufacturing process used in the production of the thermoplastic resin powder were the same as in Example 1.

Experimental Example  1: Thermoplastic resin powder Cohesiveness  exam

2 is a schematic view showing a method for testing the coagulation resistance of the thermoplastic resin powder according to Experimental Example 1. Fig.

Specifically, in Example 1-9 and Comparative Example 1 The thermoplastic resin powder to 5 In the thermoplastic resin powder 30g prepared according to the method for producing the mold of the cylinder-shaped having an inner diameter of 45mm, height 100mm, and 1kg / cm ² And stored at 40 ° C and 85% RH (relative humidity) for 3 hours under pressure. Then, the prepared powder block was placed on a sieve having a mesh interval of 4 mm, and the powder block was vibrated at 100 Hz for 100 seconds. After 5 minutes, the weight of the powder remaining on the sieve was measured and the amount of powder remaining relative to the powder block charged was calculated.

At this time, a high residual ratio means that the powder block can not be broken down to a fine powder enough to pass through the sieve, which means that the cohesion of the thermoplastic resin powder is poor.

Experimental Example  2: Physical property test of the final product

The effects of emulsified EBS on the physical properties of the final product were investigated in the preparation of thermoplastic resin powders. 100 parts by weight of a resin composition consisting of 44% by weight of each thermoplastic resin powder prepared in Examples 1 to 9 and Comparative Examples 1 to 5 and 56% by weight of a general SAN was mixed with 0.2 part by weight of an antioxidant (Songwon Industrial SN 147BF) And 0.7 part by weight of a lubricant (Pioneer Chemical, SUNLUBE) were mixed, and specimens were prepared at 230 DEG C using a twin extruder and an injection machine. The physical property evaluation items and evaluation methods for the specimens are as follows.

- Impact strength: measured according to ASTM D256 at a thickness of 3.2 mm.

- Flow Index: measured according to ASTM D1238.

- Tensile strength: measured according to ASTM D638.

- Polishing degree: Measured using Micro Haze Plus according to ASTM D523.

- Change in gloss of heat-resisting gloss: The resin was retained for 10 minutes in an extruder screw set at 240 ° C, and the molded specimen was evaluated for the difference in gloss between the specimen and the specimen. When the value of the heat-resistant gloss change degree is 10 or less, it is indicated by "?"

The dosage of each component to be administered in accordance with the production method of the thermoplastic resin powders of Examples 1 to 9 and Comparative Examples 1 to 5 and the coagulation property of the thermoplastic resin powder prepared through Experimental Examples 1 and 2 and the physical properties The test results are shown in Table 1 and FIG.

Example Comparative Example One 2 3 4 5 6 7 8 9 One 2 3 4 5 ASA
(Solid content) 100 100 Oxidation
Inhibitor 0.6 0.6 Salting agent 4 4 EBS 4 2 0.5 4 2 0.5 4 2 0.5 - 2 2 5 0.1 EBS grain size
(탆) 1.5 1.5 1.5 4.0 4.0 4.0 6.0 6.0 6.0 - 1.0 6.2 4.0 4.0 Remaining rate
(%) 35 46 63 40 55 68 51 70 77 98 30 90 32 82 Impact strength
(kg? m / cm) 14 16 15 18 14 15 17 16 15 15 14 13 17 15 Flow index
(g / 10 min, 220 캜, 10 kg) 16 18 17 17 16 15 18 18 16 17 19 15 18 17 The tensile strength
(kg / cm ² ) 416 415 418 420 422 415 419 414 420 420 423 424 418 419 Glossiness
(%, 60 [deg.]) 95 97 97 92 93 95 97 97 96 97 94 92 91 97 Heat-resistant gloss
Degree of change ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ × ○ × ○

(Dose unit: parts by weight)

In Experimental Example 1, if the residual rate of the powder after vibration of the sieve without controlling the temperature, humidity, and pressure is checked, all of the results are less than 0.5%, and the deviation of the coagulation property can not be confirmed. This is because hard rubber styrene and acrylonitrile are primarily grafted or coated on the rubber latex due to the characteristics of the ASA or ABS product, so that there is no cohesion between the powders in the process of recovering the powder in the latex state.

Therefore, it is possible to control coagulation phenomena between the powders by controlling the process variables such as temperature, pressure and humidity to a specific value or range, and thus the cohesion of the thermoplastic resin powder according to the examples and the comparative examples can be compared.

In the above evaluation method, the residual ratio may vary depending on the process variables such as temperature, humidity, and pressure. However, since the residual ratio is relatively wide in the condition of Experimental Example 1, it is easy to compare and determine the coagulation property between powders .

Test results of Examples 4 to 6 and Comparative Examples 4 to 5 show that when the dosage of the emulsified EBS is out of the range of 0.5 to 4 parts by weight, the cohesiveness of the thermoplastic resin powder is lowered as the residual ratio is increased, Excessive amounts of emulsified EBS were found to reduce the thermal stability of the final product.

Also, when the average particle diameter of the emulsified EBS is out of the range of 1.5 to 6.0 탆, the residual ratio of the emulsified EBS increases, The cohesiveness was lowered. In particular, when the average particle diameter of the emulsified EBS was excessively small, it was confirmed that the thermal stability of the final product was deteriorated.

On the other hand, according to the test result of Experimental Example 2, when the emulsified EBS was added during the production of the thermoplastic resin powder, the mechanical properties and appearance quality of the product such as impact strength, flow index, tensile strength and gloss were not deteriorated. That is, it was confirmed that the physical properties of the final product can be maintained at a certain level while improving the storage stability of the thermoplastic resin powder when emulsifying EBS is administered.

Experimental Example  3: Long-term storage of thermoplastic resin powder Cohesiveness  exam

In consideration of the fact that a bag is generally used to efficiently utilize the space during storage of the thermoplastic resin powder, 800 kg of the thermoplastic resin powder produced according to the method for producing thermoplastic resin powder of Example 8 and Comparative Example 5 Was placed in each bag, loaded for two months, stored for 6 months, and visually analyzed for the state of the thermoplastic resin powder located at the lower end of the bag under pressure.

Fig. 4 shows the coagulation test result of the thermoplastic resin powder produced according to the method for producing thermoplastic resin powder of Example 8 and Comparative Example 5 in long-term storage.

In the case of the thermoplastic resin powder of Example 8 in which the residual ratio was 70%, the thermoplastic resin powder remained in powder form, whereas in the case of the thermoplastic resin powder of Comparative Example 5 with a residual ratio of 82%, excessive aggregation occurred between the powders Can be confirmed. That is, it was confirmed that the coagulation property of the thermoplastic resin powder was improved when the residual ratio was 70% or less under the above conditions.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

Claims (11)

In the method for producing a thermoplastic resin powder,
(a) a rubber-modified graft copolymer latex in a reactor, 0.1 to 2.0 parts by weight of an antioxidant, 1 to 10 parts by weight of a salting agent, and 120 to 200 parts by weight of water, based on 100 parts by weight of a solid content of the rubber-modified graft copolymer latex To produce a rubber-modified graft copolymer powder; And
(b) 2 to 4 parts by weight of emulsified ethylene bis stearamide (EBS) is added to the reactor in an amount of 100 parts by weight based on 100 parts by weight of the solid content of the rubber-modified graft copolymer latex to agglomerate and recover the rubber-modified graft copolymer latex Comprising the steps of: preparing a thermoplastic resin powder;
The method for producing a thermoplastic resin powder according to claim 1, wherein the rubber-modified graft copolymer latex is graft-polymerized with an aromatic vinyl compound and a vinyl cyan compound onto an acrylic or conjugated diene rubber latex.
The method for producing a thermoplastic resin powder according to claim 2, wherein the aromatic vinyl compound is at least one selected from the group consisting of styrene, alpha methyl styrene, alpha ethyl styrene, paramethyl styrene, and vinyl toluene.
The method for producing a thermoplastic resin powder according to claim 2, wherein the vinyl cyan compound is at least one selected from the group consisting of acrylonitrile, methacrylonitrile, and ethacrylonitrile.
The method of claim 2, wherein the rubber-modified graft copolymer latex is selected from the group consisting of acrylonitrile-butadiene-styrene (ABS) latex or acrylate-styrene-acrylonitrile (ASA) Wherein the thermoplastic resin powder is a latex.
The method for producing a thermoplastic resin powder according to claim 1, wherein the antioxidant is at least one selected from the group consisting of phenol, phosphorus, and sulfur ester.
2. The method of claim 1 wherein the salting agent is selected from the group consisting of citrate, edetate, glycolate, phosphate, hydrochloride, sulfate, acetate, tartrate, bromate, oxalate, lactate, carbonate, By weight based on the total weight of the thermoplastic resin powder.
delete The method for producing a thermoplastic resin powder according to claim 1, wherein the emulsion EBS (ethylene bis stearamide) has an average particle diameter of 1.5 to 6 mu m.
The method for producing a thermoplastic resin powder according to claim 1, wherein the temperature of the reactor in the steps (a) and (b) is Ta and Tb, respectively, and Ta?
The method of producing a thermoplastic resin powder according to claim 10, wherein the Ta is from 75 to 85 캜, and the Tb is from 85 to 95 캜.

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