KR101696226B1 - Menufacturing method of chlorinated polyvinyl chloride resin and chlorinated polyvinyl chloride resin using the thereof - Google Patents

Abstract

The present invention relates to a chlorinated polyvinyl chloride resin composition and a method for producing the same, and more particularly, to a chlorinated polyvinyl chloride resin composition using a composition comprising two kinds of polyvinyl chloride resins having a specific molecular weight distribution, It is an object of the present invention to provide a chlorinated polyvinyl chloride resin which is remarkably improved in molding processability, heat resistance and impact resistance when a vinyl chloride resin is produced, and scale is not generated on the inner wall surface of the reactor.

Description

TECHNICAL FIELD [0001] The present invention relates to a chlorinated polyvinyl chloride resin and a chlorinated polyvinyl chloride resin produced by the same. BACKGROUND OF THE INVENTION [0001] The present invention relates to a chlorinated polyvinyl chloride resin,

The present invention relates to a method for producing a chlorinated polyvinyl chloride resin and a chlorinated polyvinyl chloride resin produced by the method. More particularly, the present invention relates to a method for producing a chlorinated polyvinyl chloride resin comprising two kinds of polyvinyl chloride resins having a specific molecular weight distribution and an anti- A process for producing a chlorinated polyvinyl chloride resin in which a molding processability, a heat resistance and an impact resistance are remarkably improved by producing a polyvinyl chloride resin and a scale is not generated on the inner wall surface of the reactor, and a process for producing the chlorinated polyvinyl chloride resin will be.

Polyvinyl Chloride (PVC) is an excellent ash with many advantages such as mechanical strength, weather resistance, chemical resistance and flame retardancy, and is used in many fields. However, due to lack of heat resistance and impact resistance, various applications were limited. Studies have been made to improve physical properties by chlorinating polyvinyl chloride resin as a method for improving insufficient heat resistance and impact resistance.

(HDT) of conventional polyvinyl chloride resin (PVC) is in the vicinity of 60 to 70 DEG C, there is a problem that it can not be used for hot water having a temperature of 60 DEG C or more. However, chlorinated polyvinyl chloride resin (CPVC) Since the heat distortion temperature (HDT) is 20 to 40 ° C higher than that of conventional polyvinyl chloride resin (PVC), it can be used for hot water of 60 ° C or higher. And the corrosion problem occurring at the connection portion can be solved.

However, since the chlorinated polyvinyl chloride resin (CPVC) has a high heat distortion temperature, a high temperature and a strong shearing force are required at the time of melting and machining, and the resin is easily deteriorated, In many cases, the vinyl chloride resin is molded and processed in a state in which the width of the molding process is narrow and it is not sufficiently melted.

Further, in the prior art, there is known a technique of using a vinyl resin capable of copolymerizing with a filler or vinyl chloride in order to improve heat resistance and impact resistance, but there is a problem that the improvement in heat resistance becomes insignificant, And a large amount of scale is generated at the time of polymerization, so that it is adhered to the wall surface of the reactor and the scale removal work must be performed together.

Japanese Patent Application Laid-Open No. 2005-126519 (Patent Document 1) discloses a method in which a photocuring reaction of a polyvinyl chloride resin is initiated in an aqueous phase without using an expansion liquid such as chloroform, and Korean Patent Registration No. 0452391 Patent Document 2) discloses a chlorinated polyvinyl chloride compound that undergoes a two-step chlorination reaction including chlorinated polyethylene and an impact modifier.

As can be seen from the above, when the polyvinyl chloride resin is sufficiently chlorinated by the prior art, the meltability and moldability are lowered. When the meltability and the molding processability are improved, the heat resistance is lowered. And it is difficult to produce a chlorinated polyvinyl chloride resin having excellent moldability and excellent impact resistance and heat resistance.

Particularly, the scale is generated in the chlorination process, and the inner wall of the reactor is contaminated. As a result, the chlorination reaction does not proceed well. In particular, the ultraviolet irradiation is not smoothly performed due to the generated scale, There is a disadvantage in that the reaction can not be performed uniformly.

Japanese Patent Laid-Open No. 2005-126519 Korea Patent No. 0452391

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art, and it is an object of the present invention to provide a method for producing a chlorinated polyvinyl chloride resin by using a composition comprising two kinds of polyvinyl chloride resins and a scale inhibitor having a specific molecular weight distribution, And a method for producing a chlorinated polyvinyl chloride resin in which scale is not generated on the inner wall surface of the reactor.

It is another object of the present invention to provide a chlorinated polyvinyl chloride resin produced by the above production method.

According to an aspect of the present invention,

(a) a first polyvinyl chloride resin having a degree of polymerization of 400 to 800 and a K value of 40 to 62, a second polyvinyl chloride resin having a degree of polymerization of 900 to 1800 and a K value of 64 to 81 and an anti- Mixing the aqueous slurry to prepare an aqueous slurry; (b) introducing chlorine into the aqueous slurry and pressurizing to chlorinate; And (c) separating the excess hydrochloric acid from the chlorinated polyvinyl chloride resin, wherein in step (a), the concentration of oxygen contained in the slurry is controlled to be less than 100 ppm, and in the step (b) Wherein the chlorinated polyvinyl chloride resin is produced at a pressure of 10 to 100 psig for 5 to 50 minutes.

In the step (a), the mixing ratio of the first polyvinyl chloride resin and the second polyvinyl chloride resin is 95 to 5 wt%: 95 to 5 wt%, and the anti-scale agent is the first polyvinyl chloride resin and the second polyvinyl chloride resin 2 to 100 parts by weight of a polyvinyl chloride resin mixture. The present invention also provides a method for producing a chlorinated polyvinyl chloride resin.

The present invention also provides a chlorinated polyvinyl chloride resin having a chlorine content of 65 to 75% by weight.

Wherein the chlorinated polyvinyl chloride resin is a first polyvinyl chloride resin having a degree of polymerization of 400 to 800 and a K value of 40 to 62, a second polyvinyl chloride resin having a polymerization degree of 900 to 1800 and a K value of 64 to 81 and a scale inhibitor The present invention provides a chlorinated polyvinyl chloride resin.

Wherein the mixing ratio of the first polyvinyl chloride resin and the second polyvinyl chloride resin is 95 to 5 wt%: 5 to 95 wt%, and the scale inhibitor is a mixture of the first polyvinyl chloride resin and the second polyvinyl chloride resin mixture 100 0.01 to 10 parts by weight based on 100 parts by weight of the total amount of the chlorinated polyvinyl chloride resin.

The anti-scale agent may be selected from the group consisting of soap (fatty acid sodium salt), monoalkyl sulfate, alkyl polyoxyethylene sulfate, alkylbenzenesulfonate, monoalkyl phosphate, monoalkyltrimethylammonium salt, dialkyldimethylammonium salt, alkylbenzylmethylammonium salt, There is provided a chlorinated polyvinyl chloride resin which is at least one selected from among betaine, polyoxyethylene alkyl ether, fatty acid sorbitan ester, fatty acid diethanolamine, and alkyl monoglyceryl ether.

The chlorinated polyvinyl chloride resin also provides a chlorinated polyvinyl chloride resin having a tensile strength of 500 to 600 kg / cm 2, a flexural strength of 700 to 800 kg / cm 2, and an impact strength of 20 to 60 kgcm / cm.

According to the process for producing the chlorinated polyvinyl chloride resin of the present invention and the chlorinated polyvinyl chloride resin produced thereby, it is possible to produce a chlorinated polyvinyl chloride resin containing two kinds of polyvinyl chloride resins having a specific molecular weight distribution, When the resin is produced, the molding processability, high heat resistance and impact resistance are remarkably improved, and the scale is not generated on the inner wall surface of the reactor by including the specific scale inhibitor, so that the reaction time can be remarkably shortened in the production process, .

Hereinafter, the method for producing the chlorinated polyvinyl chloride resin of the present invention and the chlorinated polyvinyl chloride resin produced by the method will be described in detail. The present invention may be better understood by the following examples, which are for the purpose of illustrating the present invention and are not intended to limit the scope of protection defined by the appended claims.

DETAILED DESCRIPTION OF THE INVENTION The present invention describes in detail a method for producing a chlorinated polyvinyl chloride resin. (a) a first polyvinyl chloride resin having a polymerization degree of 400 to 800 and a K value of 40 to 62, a second polyvinyl chloride resin having a polymerization degree of 900 to 1800 and a K value of 64 to 81, and a scale inhibitor, Preparing an aqueous slurry; (b) introducing chlorine into the aqueous slurry and pressurizing to chlorinate; And (c) separating the excess hydrochloric acid from the chlorinated polyvinyl chloride resin.

 The aqueous slurry containing the first polyvinyl chloride resin and the second polyvinyl chloride resin is preferably reacted in a hermetically sealed reactor and it is effective to maintain the temperature of step (a) at a temperature of 10 to 40 ° C . In the case where the temperature of the reactor is less than 10 ° C, the amount of chlorine dissolved increases. In the step (b), however, And when the temperature of the reactor is higher than 40 ° C, there arises a problem that the amount of chlorine dissolved decreases and the reaction time of step (b) becomes longer.

In addition, when there is a large amount of oxygen in the reactor, it interferes with the progress of the chlorination reaction. Therefore, an inert gas containing nitrogen, helium, or argon is introduced to control the content of oxygen or decompress the inside of the reactor, , And it is effective to control the concentration of oxygen in the reactor to be less than 100 ppm.

In the step b), chlorine is introduced into the aqueous slurry and chlorinated by pressurization. In order to effectively carry out the chlorination reaction, it is preferable to precede the immersing step in which an excessive amount of chlorine (Cl) is introduced into the reactor containing the aqueous slurry in a gas or liquid state and the chlorine is sufficiently dissolved in the aqueous slurry, It is effective to carry out the immersing step at a pressure of 10 to 100 psig for 5 to 50 minutes. When the pressure of the reactor is less than 10 psig, the chlorine is not sufficiently dissolved in the aqueous slurry, the chlorination reaction time becomes excessively long, and sufficient heat resistance and impact resistance are not easily improved. When the pressure of the reactor is more than 100 psig, The reaction time is somewhat short. However, uniform chlorination is difficult to be carried out, so that there arises a problem that the effect of improving the physical properties of heat resistance and impact resistance is insignificant.

When the silting time is less than 5 minutes, a 1,1-dichloroethylene (1,1-dichloroethylene) structure is formed in a large amount, and the properties of heat resistance and impact resistance are deteriorated. When the silting time is more than 50 minutes, The time is too long and, from a commercial point of view, the problem of increased process costs arises. When the solution is immersed in an optimal time of 5 to 50 minutes, 1,2-dichloroethylene (1,2-dichloroethylene) structure is formed in a large amount, and stable chlorination reaction can proceed, thereby remarkably improving heat resistance and impact resistance There are advantages. The chlorination step can be carried out directly without performing the above-mentioned submerging step, but this leads to a problem that the reaction time is lengthened by reducing the chlorination reaction efficiency and the physical properties such as heat resistance and impact resistance are insignificant.

After the submerging step, it is effective to conduct the chlorination reaction using an optical modulator or a chemical reaction initiator. The reaction initiation light source is not limited as long as it is a conventional light source for application to a photocuring unit. For example, one or two selected from Neon Glow Tube, Fluorescent Tube, Carbon Arc, Sodium vapor lamp and UV lamp can be used , It is particularly effective to use a UV lamp. The reaction can also be carried out using a chemical reaction initiator. The chemical reaction initiator is not limited as long as it is a conventional peroxide-based catalyst, and examples thereof include ketone peroxides such as methyl ethyl ketone peroxide and methyl isobutyl ketone peroxide; Hydroperoxides such as 2,4,4-trimethylpentyl-2-hydroperoxide and diisopropylbenzene hydroperoxide; Benzoyl peroxide, benzoyl peroxide, 1,3-bis (tertiary-butylperoxyisopropylene) benzene, 2,5-dimethyl-2,5-di (tertiary butyl Diacyl peroxides such as peroxy) hexane; 1,1-di-tert-butylperoxy-3,3,5-trimethylcyclohexane, and 2,2-di- (tertiary butylperoxy) butane; Alkyl peresters such as 2,2,4-trimethylpentyl peroxy neodecanoate and tert-butyl peroxy-neodecanoate; And percarbonates such as di-3-methoxybutyl peroxydicarbonate, tertiary oxybutyl peroxyisopropyl carbonate, and the like are effective. However, the present invention is not limited to these examples, and can be selected from among light curing agents and chemical reaction initiators.

It is effective that the chlorination reaction proceeds at a temperature of 30 to 70 DEG C and a pressure of 10 to 100 psig. When the temperature is less than 30 캜 and the pressure is less than 10 psig in the chlorination reaction, the reaction time becomes excessively long, and sufficient heat resistance and physical properties of the impact resistance are difficult to be improved. When the temperature is 70 캜 in the chlorination reaction and the pressure is more than 100 psig , The reaction time is somewhat short. However, uniform chlorination is difficult to occur, which causes a problem of insufficient improvement of the physical properties of heat resistance and impact resistance.

It is effective that the termination of the chlorination reaction is continued after 2 to 6 hours and then terminated, or the end time is determined by measuring the weight of chlorine lost in the amount of the initially charged chlorine in the cylinder installed in the reactor. The chlorine content is determined according to the reaction time, and the optimum chlorine content of the chlorinated polyvinyl chloride resin is preferably 65 to 75 wt%.

When the reaction time is less than 2 hours, chlorinated polyvinyl chloride resin containing chlorine of 65% by weight or less can be produced. If the reaction time is more than 6 hours, 70% by weight of chlorine-containing polyvinyl chloride resin can do.

When the chlorination reaction is completed, it is preferable to perform the step (c) of separating the excess hydrochloric acid and the chlorinated polyvinyl chloride resin. At this time, the aqueous slurry which has been reacted is centrifuged in an uncooled state to separate hydrochloric acid and chlorinated polyvinyl chloride resin. The separated chlorinated polyvinyl chloride resin can be neutralized with an ordinary alkaline aqueous solution, and it is particularly effective to neutralize with sodium hydrogencarbonate (NaHCO3). Thereafter, it is preferable to remove residual hydrochloric acid to a pH of 6 to 8 by using water, and the neutralized chlorinated polyvinyl chloride resin is dried at 60 to 80 ° C for 3 to 6 hours using a drying apparatus effective. When the drying temperature is less than 60 ° C or the drying time is less than 3 hours, the drying time becomes long. When the drying temperature is more than 80 ° C or the drying time is more than 6 hours, the chlorinated polyvinyl chloride resin is deteriorated And the effect of improving heat resistance and impact resistance is insignificant.

Next, the chlorinated polyvinyl chloride resin produced by the above production method will be described in detail.

The present invention relates to a resin composition comprising a first polyvinyl chloride resin having a polymerization degree of 400 to 800 and a K value of 40 to 62, a second polyvinyl chloride resin having a polymerization degree of 900 to 1800 and a K value of 64 to 81, And a chlorinated polyvinyl chloride resin having a chlorine content of 65 to 75% by weight.

The first polyvinyl chloride resin preferably has a degree of polymerization of 400 to 800, a K value of 40 to 62, more preferably a polymerization degree of 450 to 800 and a K value of 52 to 62, Are added to improve workability formation. The second polyvinyl chloride resin preferably has a degree of polymerization of 900 to 1800, a K value of 64 to 81, more preferably a polymerization degree of 1000 to 1800 and a K value of 65 to 75, Heat resistance and impact resistance.

The first polyvinyl chloride resin and the second polyvinyl chloride resin may be any known resins generally used as polyvinyl chloride resins. Specific examples thereof include vinyl chloride homopolymers, copolymers of vinyl chloride and ethylene, propylene, alkyl It is effective to use vinyl ether, vinylidene chloride, vinyl acetate, maleic acid ester and copolymers thereof or a mixture thereof.

The mixing ratio of the first polyvinyl chloride resin and the second polyvinyl chloride resin is preferably from 5 to 95% by weight, more preferably from 95 to 5% by weight, more preferably from the first polyvinyl chloride resin to the second polyvinyl chloride resin, It is effective that the mixing ratio of the vinyl chloride resin is 20 to 80% by weight: 80 to 20% by weight.

When the mixture was prepared at the above mixing ratio, a chlorinated polyvinyl chloride resin composition excellent in workability formation and excellent in mechanical properties, heat resistance and impact resistance was obtained. If the amount of the first polyvinyl chloride resin is less than 5 wt% or the amount of the second polyvinyl chloride resin is more than 95 wt%, the formation of the melt characteristic and the workability is significantly reduced. If the amount of the first polyvinyl chloride resin is less than 95 wt% By weight or less than 5% by weight of the second polyvinyl chloride resin, the heat resistance and the impact resistance are remarkably reduced.

In addition, the scale inhibitor contained in the chlorinated polyvinyl chloride resin may be used without limitation, one or two selected from conventional anionic surfactants, cationic surfactants, amphoteric surfactants and nonionic surfactants. For example, it is possible to use a salt such as a soap (sodium fatty acid), a monoalkylsulfate, an alkylpolyoxyethylene sulfate, an alkylbenzenesulfonate, a monoalkyl phosphate, a monoalkyltrimethylammonium salt, a dialkyldimethylammonium salt, an alkylbenzylmethylammonium salt, It is effective to use one or more kinds selected from carboxybetaine, polyoxyethylene alkyl ether, fatty acid sorbitan ester, fatty acid diethanolamine and alkyl monoglyceryl ether. The anti-scale agent enhances wettability and prevents scale formation on the inner wall of the reactor, thereby improving workability, heat resistance, and impact resistance through uniform chlorination of the polyvinyl chloride resin in the chlorination reaction.

The anti-scale agent is preferably contained in an amount of 0.01 to 10 parts by weight based on 100 parts by weight of the first polyvinyl chloride resin and the second polyvinyl chloride resin mixture. When the content of the anti-scale agent is less than 0.01 part by weight, the wettability and scale removal effects of the first polyvinyl chloride resin and the second polyvinyl chloride resin are insignificant, and the content of the anti- If the amount is more than 10 parts by weight, the chlorinating reaction is interfered with by an excessive amount of the scale inhibitor component, so that a sufficient chlorinated polyvinyl chloride resin can not be produced, thereby resulting in a problem of insufficient improvement in heat resistance and impact resistance.

The chlorinated polyvinyl chloride resin produced by the above production method has a chlorine content of 65 to 75% by weight, a tensile strength of 500 to 600 kg / cm 2, a flexural strength of 700 to 800 kg / cm 2, an impact strength of 20 To 60 kgcm / cm.

Further, the glass transition temperature (Tg) was 115 to 160 占 폚 at a density of 1.5 to 1.8 g / cc (25 占 폚), and the melting property was improved to improve the molding processability without deteriorating the mechanical properties and the heat resistance and impact resistance The chlorinated polyvinyl chloride resin was remarkably improved and the scale was not formed in the inside of the reactor.

The characteristics of the chlorinated polyvinyl chloride resin of the present invention were evaluated by the following test method, and the results are shown in Table 2 below.

(1) Tensile strength

A tensile speed of 50 mm / min was measured using an Instron tensile tester (Model 4204) according to ASTM D638.

(2) Flexural strength

 ASTM D790 was measured using an Instron tensile tester (Model 4204) at a speed of 10 mm / min.

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(4) Impact strength

ASTM D256 method, and a 60 kg hammer was used for the Charpy type specimen and the notch was placed on the specimen using a notching machine.

(5) Processability

The extruded amount of the molten resin was measured when the mixed powder was extruded in a 20 mm single screw extruder at 190 ° C to 200 ° C for 3 minutes and the extruded amount was 450g or more. (⊚). When the extrusion amount was less than 450 g, it was judged that the workability was poor (X). The results are shown in Table 2 below.

(6) Measurement of chlorine content

Chloride ion content was measured using the Metrohm 833 Basic IC plus instrument using anion chromatography.

(7) Scale measurement

After the completion of the reaction, the hydrochloric acid solution and the slurry were separated from the aqueous slurry, and the scale produced on the inner wall of the reactor was visually observed. When scale was formed and a hard lump was formed in the following Table 2, When a slight scale of the powder state is generated, it is indicated as no scale.

[Example 1]

It has a jacket on the outside for temperature control. It is equipped with UV lamp (high pressure mercury lamp with 250nm - 500nm wavelength and light intensity 200mW - 7200mW) 30.5 g of the first polyvinyl chloride resin having a value of 58.5 and a degree of polymerization of 700, 70 g of a second polyvinyl chloride resin having a K-value of 65.5, a polymerization degree of 1000, and 1 g of alkyl monoglyceryl ether as a surfactant were charged and the reactor pressure became 70 psig After the chlorine was introduced and pressurized, the chlorination reaction was continued for 5 hours. When the chlorine content reached 68 wt%, the supply of chlorine was stopped and the reaction was terminated. After completion of the reaction, the chlorinated polyvinyl chloride resin was separated from the suspension of the reactor, neutralized with sodium hydrogencarbonate, and washed with water. After drying at 70 ° C. for 4 hours to evaporate water, chlorinated polyvinyl chloride resin was obtained. The degree of chlorination was measured and is shown in Table 2 below.

The chlorinated polyvinyl chloride resin thus prepared was dry blended for 3 minutes in the form of a mixture of 1.5 parts by weight of a Tin-based heat stabilizer, 2.5 parts by weight of a PE wax-based lubricant and 5 parts by weight of an MBS-based impact modifier. . The sheet was cut into 3 minutes for 3 minutes and then pressed into a press mold. The sample sheet for measurement was obtained at 195 ℃ for 3 minutes, 3 minutes for high pressure and 3 minutes for cooling. The measurement results are shown in Table 2 below.

[ Example 2 ]

In the same manner as in Example 1, except that 50 g of the first polyvinyl chloride resin having a K-value of 58.5 and a polymerization degree of 700 was used in Example 1, and 50 g of a second polyvinyl chloride resin having a K-value of 65.5 and a polymerization degree of 1000 was used The results of the physical properties measurement are shown in Table 2.

[ Example 3 ]

The same procedures as in Example 1 were carried out except that 80 g of the first polyvinyl chloride resin having a K-value of 58.5 and a degree of polymerization of 700 was used in Example 1, and 20 g of a second polyvinyl chloride resin having a K-value of 80 and a polymerization degree of 1300 was used The results of the physical properties measurement are shown in Table 2.

[ Comparative Example 1 ]

In the same manner as in Example 1, except that 4 g of the first polyvinyl chloride resin having a K-value of 58.5 and a polymerization degree of 700 was used in Example 1, and 96 g of a second polyvinyl chloride resin having a K-value of 80 and a degree of polymerization of 1000 was used The results of the physical properties measurement are shown in Table 2.

[ Comparative Example 2 ]

The procedure of Example 1 was repeated, except that 96 g of the first polyvinyl chloride resin having a K-value of 58.5 and a degree of polymerization of 700, and 4 g of a second polyvinyl chloride resin having a K-value of 80 and a degree of polymerization of 1000 were used The results of the physical properties measurement are shown in Table 2.

[ Comparative Example 3 ]

The same procedure as in Example 1 was carried out except that 100 g of the first polyvinyl chloride resin having a K-value of 58.5 and a degree of polymerization of 700 was used in Example 1, and the physical property measurement results are shown in Table 2.

[ Comparative Example 4 ]

The same procedure as in Example 1 was carried out except that 100 g of a second polyvinyl chloride resin having a K-value of 80 and a degree of polymerization of 1000 was used in Example 1, and the physical property measurement results are shown in Table 2.

[ Comparative Example 5 ]

Table 2 shows the results of the physical properties measurement in Example 1, except that no surfactant was used.

[Table 1]

[Table 2]

Referring to Table 2, when Examples 1 to 3 and Comparative Examples 1 to 5 were compared, it was found that the first polyvinyl chloride resin, the second polyvinyl chloride resin, and the anti-scale agent were optimum as shown in Examples 1 to 3 It was found that the impact strength was improved more effectively, no scale was formed on the inner wall of the reactor, and the processability was improved.

In the case where the first polyvinyl chloride resin and the second polyvinyl chloride resin are not contained in the optimum amount as shown in Comparative Examples 1 to 4, or when the first polyvinyl chloride resin or the second polyvinyl chloride resin alone is used Impact strength and workability were deteriorated, and it was found that some scales became worse.

Further, as shown in Comparative Example 5, when a scale inhibitor is not used, a much larger and harder scale is formed than when a scale inhibitor is used, so that the mechanical properties such as tensile strength, bending strength and impact strength and workability are significantly reduced .

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Accordingly, the above description should not be construed as limiting the scope of the present invention defined by the limits of the following claims.

Claims (9)

(a) a first polyvinyl chloride resin having a polymerization degree of 400 to 800 and a K value of 40 to 62, a second polyvinyl chloride resin having a polymerization degree of 900 to 1800 and a K value of 64 to 81 and an anti- Mixing the aqueous slurry to prepare an aqueous slurry;
(b) introducing chlorine into the aqueous slurry and pressurizing to chlorinate; And
(c) separating the excess hydrochloric acid from the chlorinated polyvinyl chloride resin, wherein the scale inhibitor is one or more selected from an ionic surfactant, a cationic surfactant, an amphoteric surfactant and a nonionic surfactant, or Process for producing chlorinated polyvinyl chloride resin of two or more kinds
The method according to claim 1,
A method for producing a chlorinated polyvinyl chloride resin wherein the concentration of oxygen contained in the slurry is controlled to be less than 100 ppm in the step (a)
The method according to claim 1,
In the step (b), the chlorination step may be carried out at a pressure of 10 to 100 psig for 5 to 50 minutes.
The method according to claim 1,
In the step (a), the mixing ratio of the first polyvinyl chloride resin and the second polyvinyl chloride resin is 95 to 5 wt%: 95 to 5 wt%, and the scale inhibitor comprises the first polyvinyl chloride resin and the second polyvinyl chloride resin, A process for producing a chlorinated polyvinyl chloride resin which is 0.01 to 10 parts by weight based on 100 parts by weight of a vinyl chloride resin mixture
A first polyvinyl chloride resin produced by a process for producing a chlorinated polyvinyl chloride resin as defined in any one of claims 1 to 4 and having a polymerization degree of 400 to 800 and a K value of 40 to 62, And a K value of 64 to 81, and a scale inhibitor which is one or more than two selected from an ionic surfactant, a cationic surfactant, an amphoteric surfactant and a nonionic surfactant, A chlorinated polyvinyl chloride resin having a chlorine content of 65 to 75% by weight
delete 6. The method of claim 5,
Wherein the mixing ratio of the first polyvinyl chloride resin and the second polyvinyl chloride resin is 95 to 5 wt%: 5 to 95 wt%, and the scale inhibitor is a mixture of the first polyvinyl chloride resin and the second polyvinyl chloride resin mixture 100 0.01 to 10 parts by weight based on the weight of the chlorinated polyvinyl chloride resin
6. The method of claim 5,
The anti-scale agent may be at least one selected from the group consisting of fatty acid sodium, monoalkyl sulfate, alkyl polyoxyethylene sulfate, alkylbenzenesulfonate, monoalkyl phosphate, monoalkyltrimethylammonium salt, dialkyldimethylammonium salt, alkylbenzylmethylammonium salt, alkylsulfobetaine, , A polyoxyethylene alkyl ether, a fatty acid sorbitan ester, a fatty acid diethanolamine, and an alkyl monoglyceryl ether.
6. The method of claim 5,
Wherein the chlorinated polyvinyl chloride resin is a chlorinated polyvinyl chloride resin having a tensile strength of 500 to 600 kg / cm 2, a flexural strength of 700 to 800 kg / cm 2 and an impact strength of 20 to 60 kg / cm