KR100752503B1 - PVC Processing-Aids and Process for Manufacturing thereof - Google Patents

Abstract

The present invention relates to a processing aid for a vinyl chloride resin and a method for producing the same, comprising an internal lubricant for vinyl chloride resin in a methyl methacrylate-based polymer, wherein the internal lubricant according to the present invention is contained. The processing aids help the melting of vinyl chloride resins faster than conventional methyl methacrylate polymers alone, and ultimately improve the processability and physical properties of vinyl chloride resins.

Processing aids, processing aids, thermoplastics, lubricants, vinyl chloride resins, miniemulsions

Description

Processing aid for vinyl chloride resin and its manufacturing method {PVC Processing-Aids and Process for Manufacturing example}

1 is a SEM photograph of a processing aid containing an internal lubricant prepared according to Example 1 of the present invention.

2 is a functional diagram of a vinyl chloride resin and a processing aid.

3 is a graph of a vinyl chloride resin gelation curve showing the relationship between time and torque during the progress of gelation of vinyl chloride resin.

The present invention relates to a processing aid used in a vinyl chloride resin and a method for producing the same, and more particularly, to a latex containing an internal lubricant by polymerizing a monomer, an internal lubricant, an emulsifier, an initiator, and deionized water by mixing and miniemulsion polymerization. The present invention relates to a processing aid in the form of a particle, and to a processing aid for improving the processability and physical properties of the vinyl chloride resin by providing the processing aid of the vinyl chloride resin.

In general, vinyl chloride resin has the advantages of excellent physical, chemical and electrical properties compared to low price, and it can satisfy various physical properties from rigid to flexible products by adjusting the prescription properly. Wide range of products, pipes, window frames, containers, decorative materials, etc., and a variety of products. However, vinyl chloride resin has a disadvantage in that heat resistance and impact resistance are weak and difficult to process. Vinyl chloride resin is molded by two kinds of energy: mechanical shear force transmitted from the processing machine to the resin and external heat energy. The vinyl chloride resin must be carried out under conditions so that the internal temperature of the resin is maintained within a limited range during molding. The reason is that the pyrolysis temperature of PVC resin is very close to the upper limit of the processing temperature, so if it is processed incorrectly under the conditions outside of this processing range, the resin itself will undergo pyrolysis, which will lead to rapid deterioration of physical properties and environmental pollution. This happens because.

On the other hand, the vinyl chloride resin can fully exhibit the advantages of the resin itself should be processed to reach the molten state in which the molecules are uniformly mixed while the boundaries between the primary particles constituting the basic grains are released. However, due to the characteristics of the resin, vinyl chloride resin has a very long time to be completely melted, and when molding is completed before complete melting, the impact resistance, formability, mechanical properties, etc. of the final product are reduced, and the surface of the product is also rough. Commodity value is halved. This problem, namely, to improve the intrinsic melt retardation characteristics of vinyl chloride resins to fully exhibit their mechanical and chemical properties is called a processing aid, and the use of these is essential for the processing of vinyl chloride resins. This processing aid is added to about 1 to 5 parts by weight based on 100 parts by weight of the vinyl chloride resin to improve the processability so that the excellent physical properties of the vinyl chloride resin can be maximized.

For example, processing aids added to vinyl chloride resins improve the bank rolling properties, flow marks, air streak and surface projections of vinyl chloride resins when they are processed into calendars. It serves to reduce. In addition, when producing foamed products, the melting of the vinyl chloride resin, which forms the walls of the gas cell, helps to proceed sufficiently to increase the high temperature melt strength and to withstand the pressure of the gas that decomposes and expands at a high temperature. Burst to prevent the formation of open cells that are connected to each other. And when vacuum or blow molding also serves to improve the breaking strength and elongation at high temperatures.

The effect is that the processing aid breaks down the boundaries of the primary particles, the basic structural unit, during the molding of vinyl chloride, thereby promoting a uniform melt state at the molecular level, so that the molded product exhibits uniform mechanical and chemical properties. Because it is possible to obtain.

Most commercially available vinyl chloride processing aids are commercially available as high molecular weight polymers or methyl methacrylate monomers using methyl methacrylate having excellent compatibility with vinyl chloride resin as the main monomer. Made by using high molecular weight (molecular weight 500,000 ~ 5,000,000g / mole) polymer copolymerized with methacrylate type, compound having nitrile unsaturated double bond or monomer having aromatic unsaturated double bond by emulsion polymerization method Methyl methacrylate polymer.

On the other hand, the lubricant serves to reduce excessive friction between the polymer chains (internal lubricant) or friction between the polymer and the processing machine (external lubricant) when processing the polymer. If the lubricant is not added when processing the vinyl chloride resin, localized frictional force is generated, and the temperature of the molded product rises above the thermal denaturation temperature of the vinyl chloride resin, which may cause deformation such as pigmentation. It gets hard. In another role, the friction between the processing machine and the resin is so severe that it becomes difficult to heat deformation of the resin due to the adhesion of the resin to the processing machine or to homogenize the composition.

In order to solve the above problems, the present invention uses a processing aid and an internal lubricant in order to maximize the effect of the methyl methacrylate-based polymer processing aid, but a processing aid polymer hybrid containing an internal lubricant in a special method It is an object of the present invention to provide a new concept of processing aid and a method for producing the same, which can improve the processability of vinyl chloride resin, which is superior to the processing aid currently used by manufacturing and utilizing.

The above and other objects of the present invention can be achieved by the present invention described below.

In order to achieve the above object, the present invention provides a processing aid, comprising an internal lubricant for vinyl chloride resin in the methyl methacrylate-based polymer microparticles.

The processing aid for the vinyl chloride resin may be polymethyl methacrylate.

The processing aid for the vinyl chloride resin may further include a polymer material formed by copolymerizing a monomer having an unsaturated double bond copolymerizable with methyl methacrylate and a methyl methacrylate monomer.

The internal lubricant may be used in 5 to 900 parts by weight based on 100 parts by weight of the processing aid.

The particle size of the processing aid may be 100 to 1500 nm.

The molecular weight of the processing aid may be 100,000 to 10,000,000.

In addition, the present invention comprises the steps of mixing and homogenizing a monomer having a unsaturated double bond and polymerizable by free radicals, a hydrophobic agent, an internal lubricant, an emulsifier, an initiator and deionized water to obtain a minimization; And a mini emulsion polymerization step of heating and polymerizing the mini emulsion.

In addition, the present invention comprises the steps of mixing and homogenizing a monomer, an internal lubricant, an emulsifier, an initiator and deionized water having an unsaturated double bond and polymerizable by free radicals to obtain a minimization; And a mini-emulsion polymerization step of heating and polymerizing the mini-emulsion; wherein the internal lubricant is a solubility in water of 5 × 10 ^-6 g / g or less at 25 ° C. to provide.

In the step of obtaining the mini-emulsion may further comprise a copolymerizable monomer copolymerizable with the monomer.

The homogenization method may use a microfluidizer, an ultrasonifier, a Molton-Gaulin homogenizer or an omni-mixer.

The size of the mini-emulsion particles may be 100 to 1600 nm.

The internal lubricant is 5 to 900 parts by weight, the emulsifier is 0.05 to 3 parts by weight, the initiator is 0.01 to 0.3 parts by weight, the deionized water may be 100 to 500 parts by weight based on 100 parts by weight of the monomer, May be 10 parts by weight or less.

The monomer is a compound having an unsaturated double bond in which the polymerization reaction proceeds by free radicals, methacrylate derivative, acrylate derivative, acrylic acid derivative, methacrylonitrile derivative, styrene, styrene derivative, acrylonitrile derivative, vinyl ester At least one selected from the group consisting of derivatives, vinyl halide derivatives butadiene, isoprene, maleic anhydride and fumaric acid.

The emulsifier may be at least one selected from the group consisting of anionic emulsifiers, cationic emulsifiers and nonionic emulsifiers.

The initiator may be at least one selected from the group consisting of persulfate-based, peroxide, peroxide-based initiators, azo-based initiators and redox-based initiators.

Jiangsu the hand that is soluble in water at not more than ^{25 ℃ 5 × 10 -6 g /} g, a carbon number of C ₁₂ -C ₂₀ aliphatic hydrocarbons, C ₁₂ -C ₂₀ aliphatic alcohols, C ₁₂ -C ₂₀ of the An acrylate composed of an alkyl group having a C ₁₂ -C ₂₀ alkyl mercaptan, an organic dye, a fluorinated alkane, a silicone oil, a natural oil, a synthetic oil, an oligomer having a molecular weight of 1,000 to 500,000, and a polymer having a molecular weight of 1,000 to 500,000 One or more may be selected from the group.

The internal lubricant is C ₁₀ -C ₂₀ fatty acid ester derivative, C ₁₀ -C ₂₀ fatty acid and its metal salt, C ₆ -C ₂₀ fatty acid alcohol and its metal salt, C ₁₀ -C ₂₀ polyol and ester of fatty acid It may be selected from the group consisting of compounds and fatty acid amide derivatives of C ₁₀ -C ₂₃ , but is not limited to these lubricants.

In addition, the present invention may further comprise the step of forming a dry particle by spray drying after the step of heating and polymerizing the mini-emulsion in the manufacturing method of the processing aid, or drying after aggregation to remove moisture.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

The present invention relates to the processing of polyvinyl chloride by incorporating an internal lubricant into the interior cavity of the processing aid by a mini-emulsion method for mixing and using a processing aid and an internal lubricant, respectively, in the processing of conventional vinyl chloride resins. It relates to an improved latex processing aid.

The processing aid according to the present invention contains an internal lubricant in a methyl methacrylate polymer that provides shearing force to a vinyl chloride resin through rapid melting and adhesion, thereby lowering the glass transition temperature of the processing aid polymer, and making the internal lubricant and the processing aid polymer one. Present a way to make particles. The internal lubricant lowers the glass transition temperature of the acrylate polymer to promote adhesion of the vinyl chloride resin around the methyl methacrylate polymer.

The processing aid containing the above internal lubricant may be prepared by the following method.

(a) 100 parts by weight of monomer

(b) 5 to 900 parts by weight of internal lubricant

(c) 0 to 10 parts by weight of a strong additive

(d) 0.05 to 3 parts by weight of an emulsifier

(e) 0.01 to 0.3 parts by weight of initiator and

(f) 100 to 500 parts by weight of deionized water

After mixing the weighted components as described above using a microfluidizer, ultrasonifier (Ultrasonifier), Morton-Gaulin homogenizer (Omni-Mixer) or particles (Omni-Mixer) After homogenizing to 100-2000 nm in size, it is put into a polymerization reactor, heated to a temperature of 50 to 100 ° C. for polymerization, and latex obtained by polymerization to obtain a powder through a powdering process such as coagulation or spray drying.

The monomer is methyl methacrylate as a main component (50 to 100% by weight), and as an auxiliary component, ethyl acrylate, hydroxyethyl methacrylate, n-butyl methacrylate, which can be copolymerized with the main component and free radicals, Isobutyl acrylate, isobutyl methacrylate, n-hexyl acrylate, n-hexyl methacrylate, ethylhexyl acrylate, ethylhexyl methacrylate, n-octyl acrylate, n-octyl methacrylate, decyl Acrylate, decyl methacrylate, dodecyl acrylate, dodecyl methacrylate, stearyl acrylate, stearyl methacrylate, cyclohexyl acrylate, cyclohexyl methacrylate, 4-tert-butylcyclohexyl methacrylate Latex, benzyl acrylate, benzyl methacrylate, phenylethyl acrylate, phenylethyl methacrylate, pe Propyl acrylate, phenylpropyl methacrylate, phenylnonyl acrylate, phenylnonyl methacrylate, 3-methoxybutyl acrylate, 3-methoxybutyl methacrylate, butoxyethyl acrylate, butoxyethyl methacrylate , Diethylene glycol monoacrylate, diethylene glycol monomethacrylate, triethylene glycol monoacrylate, triethylene glycol monomethacrylate, tetraethylene glycol monoacrylate, tetraethylene glycol monomethacrylate, furfuryl acrylate Methacryl or acrylic monomers, such as furfuryl methacrylate, a nitrile monomer such as acrylonitrile or methacrylonitrile, and a monomer having an aromatic unsaturated double bond such as styrene, alphamethyl styrene or vinyl toluene; Copolymerization with Other Methyl Methacrylates All possible monomers and the like can be used, and one or more selected from these groups can be used, but is not limited to these monomers.

The amount of the internal lubricant is preferably 5 to 900 parts by weight relative to 100 parts by weight of the monomer. When the amount is 5 parts by weight or less, the effect is minimal as a processing aid including the internal lubricant, and when it is 900 parts by weight or more, it is difficult to form the polymer composition itself. Hard.

The hydrophobic agent (强 疏 水劑, ultrahydrophobe) is dissolved in 25 ° C water of 5 × 10 ^-6 g / g or less, C ₁₂ -C ₂₀ aliphatic alcohols, C ₁₂ -C ₂₀ alkyl group having a carbon number At least one selected from the group consisting of acrylates, C ₁₂ -C ₂₀ alkyl mercaptans alone or mixtures, organic dyes, fluorinated alkanes, silicone oil compounds, natural oils and synthetic oils. If the solubility of the internal lubricant in water is 5 × 10 ^-6 g / g or less, the internal lubricant can take the role of the hydrophobic agent necessary for the formation of the mini-emulsion, so that the hydrophobic agent can be omitted if necessary. Do. As a strong water agent, for example, hexadecane, heptadecane, octadecane, cetyl alcohol, isopropyl laurate, isopropyl palmitate, hexyl laurate, isopropyl myristate, myristyl myristate, cetyl myristate, 2-octyl Decyl myristate, isopropyl palmitate, 2-ethylhexyl palmitate, butyl stearate, decyl oleate and 2-octyldodecyloleate, glycol ester oils such as polypropylene glycol monooleate and neopentyl glycol 2-ethylhexanoate and polyhydric alcohol ester oils, isostearate, triglycerides and coco fatty acid triglycerides, almond oil, apricot oil, avocado oil, theobroma oil, carrot seed oil, castor oil, citrus seed oil, coconut oil , Corn oil, cottonseed oil, cucumber oil, egg oil, jojoba oil, lanolin o Sun, flaxseed oil, mineral oil, mink oil, olive oil, palm oil, phosphorus oil, peach phosphorus oil, peanut oil, rape seed oil, safflower oil, sesame oil, shark liver oil, soybean oil, sunflower seed oil, sweet almond oil, tallow, sheep oil, turtle One or more of oils, vegetable oils, whale oils and wheat germ oils, organosilicones, siloxanes, alkyl mercaptans such as n-dodecyl mercaptan, t-dodecyl mercaptan, and fluorinated alkanes such as hexafluorobenzene It may be used in combination, but is not limited to these.

The said emulsifier can select 1 or more types from the group which consists of an anionic emulsifier, a cationic emulsifier, and a nonionic emulsifier. In other words, the emulsifiers include sulfonates, carboxylates, succinates, sulfosuccinates and metal salts thereof, such as alkylbenzenesulfonic acid, sodium alkylbenzenesulfonate, alkylsulfonic acid, sodium alkylsulfonate, sodium poly Anionic emulsifiers widely used in emulsion polymerization, such as oxyethylene nonylphenylether sulfonate, sodium stearate, sodium dodecyl sulfate, sodium lauryl sulfate, sodium dodecyl sulfosuccinate, abienic acid salts and the like; Cationic emulsifiers in which amine halides, alkyl quaternary ammonium salts, alkylpyridinium salts, and the like are bonded as functional groups of higher aliphatic hydrocarbons; One or more types can be selected from the group which consists of nonionic emulsifiers, such as polyvinyl alcohol and polyoxyethylene nonylphenyl, It is not limited to these emulsifiers.

As the initiator, an initiator that generates free radicals is suitable, and typical ones may be used in the group consisting of a redox initiator composed of a peroxide compound initiator, an azo compound initiator, and a combination of various redox compounds. It is not limited to these.

It is impossible to obtain a polymer latex containing an internal lubricant by an emulsion polymerization method, which is a general method of making a processing aid. In emulsion polymerization, the monomer is supplied to the position where the polymerization proceeds in the large particles made of the monomer mixture. The monomer is supplied through diffusion through water. Due to the relatively slow diffusion rate compared to other monomers, it cannot be sufficiently moved during the polymerization. Therefore, it is impossible to obtain a processing aid in which the lubricant is unified, for example, because the added internal lubricant is broken during polymerization and a large amount of agglomerates are produced. Therefore, in the present invention, the miniemulsion polymerization method was selected.

In this miniemulsion polymerization, the role of the hydrophobic agent is very important. However, when the internal lubricant is sufficiently low in water solubility, it can be used as a hydrophobic agent. In this case, the lubricant can be used as a hydrophobic agent to form a processing aid in which the lubricant is integrated without the hydrophobic agent.

Since the polymerized processing aid latex is dispersed in the aqueous phase, a process of removing water is required for actual use. As a method of removing water, there are methods such as spray drying and coagulation drying. Preferably, a coagulation drying method capable of drying a large capacity with low energy is easily applicable.

Coagulation conditions are generally applied to the method of coagulating emulsion polymerized latex, and after the latex is heated to about 60-100 ℃, the water-soluble polyvalent metal salt is added to 0.01 to 5 parts by weight relative to the solid content of the latex, and then to form a latex again After heating for 30 minutes to 2 hours at the same temperature as the glass transition temperature of the polymer or in the range of about 30 ° C. plus the glass transition temperature, the obtained particles are filtered to discard the water and the coagulated electrolyte solution and the remaining wet cake ) Is dried using hot air or a fluidized bed dryer to obtain a processing aid from which moisture is removed.

The gelation time of the vinyl chloride resin mixed in the appropriate processing formulation is measured as a measure of the performance as a processing aid of the thus obtained polymerization composition.

Here, gelation time refers to the time taken until the primary particles of the vinyl chloride resin are lost due to the shear force and thermal energy of the vinyl chloride resin and melted into a homogeneous mixture at the molecular level. The melting curve of a typical vinyl chloride resin is shown in FIG. 3. 3 shows that initially, the vinyl chloride resin particles are present in the form of particles, but the processing load is increased by the resistance acting on the processing machine while the particles are partially dissolved-friction-welded by energy generated by heat and shear force. do. Under constant shearing and thermal energy, the vinyl chloride resin particles are released into polymer chains and ultimately gelate as they transition from the particles to the molten state. This time until gelation is called gelation time.

Hereinafter, the present invention will be described in more detail with reference to the following examples, but the scope of the present invention is not limited to the examples.

Manufacture of processing aids with internal lubricant

After polymerizing the composition in a combination as shown in Table 1 to obtain a polymer latex, it was spray-dried or flocculated to dry to prepare a processing aid (hereinafter referred to as PLP) containing an internal lubricant. The formulation for obtaining processing aid particles containing an internal lubricant is shown in Table 1 below.

Composition (part by weight) PLP1 PLP2 PLP3 PLP4 Monomer Methyl methacrylate 100 100 100 100 Internal lubricant Butyl stearate 100 100 - - Stearyl alcohol - - 100 50 Jiangsu Handmade Hexadecane - 3 - 3 Emulsifier Sodium lauryl sulfate 0.3 0.2 0.2 0.2 Initiator Lauryl peroxide 0.1 0.1 0.2 0.1 Deionized water 500 500 500 500 Polymerization temperature (℃) 70 70 90 80 Number average molecular weight (× 10 ⁴ ) 21.4 22.3 10.4 25.8 Particle size (nm) 418 542 559 601

 [Examples 1 to 4]

A dry powder mixture obtained by adding and mixing 1 part by weight of a processing aid (PLP) containing an internal lubricant and 1 part by weight of a stabilizer, which is an additive necessary for processing other vinyl chloride resin, to 100 parts by weight of polyvinyl chloride resin as shown in Table 2 below. After putting a certain amount into the Hakke Torque Rheomixer (Hakke Torque Rheomixer) and the mechanical load appearing while melting to 30 RPM at a temperature of 180 ℃ to record the gelation time.

Comparative Example 1

Except for the use of polymethyl methacrylate (PMMA) processing aid made by the method disclosed in the Republic of Korea Patent Publication No. 1996-0022602 instead of the processing aid in Example 1 to compare with the existing processing aids It carried out similarly to 1. The value measured by gelation time is shown in Table 2 below.

Comparative Example 2

The same process as in Example 1 was carried out except that the processing aid was not used in Example 1. The value measured by gelation time is shown in Table 2 below.

Comparative Example 3

The same procedure as in Example 1 was carried out except that the internal lubricant butyl stearate was used instead of the processing aid in Example 1. The value measured by gelation time is shown in Table 2 below.

[Comparative Example 4]

Example 1 was carried out in the same manner as in Example 1, except that the internal lubricant butyl stearate and polymethyl methacrylate were simply mixed instead of the processing aid. The value measured by gelation time is shown in Table 2 below.

Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Processing aid PLP1 PLP2 PLP2 PLP3 PMMA Not input Butyl stearate Butyl Stearate / PMMA Drying method Spray drying Cohesion Spray drying Spray drying Spray drying - - Spray drying Gel time (seconds) 119 118 120 124 151 180 180 156

As shown in Table 2 above, in the case of using a processing aid containing the internal lubricant of the example than the polymethyl methacrylate polymer of Comparative Example 1, which was used as a conventional processing aid, the gelation time was advanced about 30 seconds as a processing aid. It was confirmed to have very excellent physical properties.

In Comparative Examples 3 and 4, it was examined whether there was no effect when using the internal lubricant alone, or whether the gelling time was shortened when the internal lubricant was mixed with the processing aid made by the conventional method. Internal lubricant alone was not effective in improving processability, and the mixing of internal lubricant and processing aid by post-injection did not significantly deviate from the processability of existing processing aid. Therefore, the processing aid and the internal lubricant can be seen that only the composition made in the polymerization step helps to improve the processability.

Expecting the same effect, the present invention provides the present invention even if the internal lubricant is mixed with the processing aid in the dry blending of vinyl chloride resin or made into a simple mixing state with the processing aid powder and then mixed with the vinyl chloride resin. The effect is that the amount of internal lubricant in the processing aids is reduced, mixed with the entire vinyl chloride resin, or insignificant, which acts only on the local part and cannot be transmitted to the rest, slowing the effect. to be.

Comparing Examples 1 and 2, the powders prepared using the spray drying method or the agglomeration method to produce the dry particles showed the same gelation time within the experimental error range, whereby the difference in the powdering process was effective as a processing aid. It can be seen that it does not affect.

As described above, the processing aid including the internal lubricant according to the present invention has an excellent effect in shortening the processing time of the vinyl chloride resin, and is a useful invention to have excellent workability.

Although the present invention has been described in detail with reference to the described embodiments, it will be apparent to those skilled in the art that various modifications and variations are possible within the scope and spirit of the present invention, and such modifications and modifications fall within the scope of the appended claims. It is also natural.

Claims (19)

A processing aid for vinyl chloride resin, characterized by containing an internal lubricant for vinyl chloride resin in the methyl methacrylate polymer fine particles. The processing aid according to claim 1, wherein the processing aid for the vinyl chloride resin is polymethyl methacrylate. The processing aid according to claim 1, wherein the processing aid for vinyl chloride resin further comprises a polymer material formed by copolymerizing a monomer having an unsaturated double bond copolymerizable with methyl methacrylate and a methyl methacrylate monomer. pharmacy. The processing aid of claim 1, wherein the internal lubricant is used in an amount of 5 to 900 parts by weight based on 100 parts by weight of the processing aid. 2. The internal lubricant according to claim 1, wherein the internal lubricant is a fatty acid ester derivative, a C ₁₀ -C ₂₀ fatty acid derivative and a metal salt thereof, a C ₆ -C ₂₀ fatty acid alcohol and a metal salt thereof, an ester compound of a polyol and a fatty acid and a C _10- A processing aid, characterized in that at least one selected from the group consisting of C ₂₃ fatty acid amide derivatives. The monomer having an unsaturated double bond is methacrylate derivative, acrylate derivative, acrylic acid derivative, methacrylonitrile derivative, styrene, styrene derivative, acrylonitrile derivative, vinyl ester derivative, halogenated vinyl derivative butadiene. And at least one selected from the group consisting of isoprene, maleic anhydride and fumaric acid. The processing aid according to claim 1, wherein the processing aid has a particle size of 100 to 1500 nm. The processing aid according to claim 1, wherein the processing aid has a molecular weight of 100,000 to 10,000,000. Minimization by mixing and homogenizing the monomer, which has an unsaturated double bond and can be polymerized by free radical, water solubility in water of 5 × 10 ^-6 g / g or less at 25 ° C, internal lubricant, emulsifier, initiator and deionized water Obtaining; And A mini emulsion polymerization step of heating and polymerizing the mini emulsion; Process for producing a processing aid comprising a. Mixing and homogenizing a monomer having an unsaturated double bond and polymerizable by free radicals, an internal lubricant, an emulsifier, an initiator, and deionized water to obtain a minimal emulsion; And A mini emulsion polymerization step of heating and polymerizing the mini emulsion; It comprises a, wherein the internal lubricant is a method for producing a processing aid, characterized in that the solubility in water is 5 × 10 ^-6 g / g or less at 25 ℃. The method according to claim 9 or 10, further comprising a copolymerization monomer copolymerizable with the monomer in the step of obtaining the mini-emulsion. The method for producing a processing aid according to claim 9 or 10, wherein the homogenization method uses a microfluidizer, an ultrasonicifier, a molton-gaulin homogenizer or an omnimixer. The process aid according to claim 9 or 10, wherein the size of the mini-emulsion particles is 100 to 1600 nm. The method according to claim 9 or 10, wherein the internal lubricant is 5 to 900 parts by weight, the emulsifier is 0.05 to 3 parts by weight, the initiator is 0.01 to 0.3 parts by weight and the deionized water is 100 Method for producing a processing aid, characterized in that from 500 parts by weight. 10. The method according to claim 9, wherein the hydrophobic agent is C ₁₂ -C ₂₀ aliphatic hydrocarbons, C ₁₂ -C ₂₀ aliphatic alcohols, C ₁₂ -C ₂₀ acrylate consisting of an alkyl group having a carbon number, C ₁₂ -C ₂₀ Alkyl mercaptans, organic dyes, fluorinated alkanes, silicone oils, natural oils, synthetic oils, molecular weights of 1,000 to 500,000 oligomers and molecular weights of 1,000 to 500,000 Manufacturing method. 10. The method according to claim 9, wherein the water soluble agent is 10 parts by weight or less based on 100 parts by weight of the monomer. The method according to claim 9 or 10, wherein the emulsifier is selected from the group consisting of anionic emulsifiers, cationic emulsifiers and nonionic emulsifiers. The method of claim 9 or 10, wherein the initiator is at least one selected from the group consisting of persulfate-based, peroxide, peroxide-based initiators, azo-based initiators and redox-based initiators. . 11. The internal lubricant according to claim 9 or 10, wherein the internal lubricant is a fatty acid ester derivative, a C ₁₀ -C ₂₀ fatty acid derivative and a metal salt thereof, a C ₆ -C ₂₀ fatty acid alcohol and a metal salt thereof, an ester compound of a polyol and a fatty acid. And C ₁₀ -C ₂₃ fatty acid amide derivatives.

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