KR101596996B1 - Resin for blending having excellent workability, polyvinylchloride containing the same and method for preparing the same - Google Patents

Abstract

The present invention relates to a blend resin having excellent processability, a vinyl chloride resin composition containing the vinyl chloride resin and a process for producing the same, and more particularly to a vinyl chloride resin composition comprising a vinyl chloride resin having an average particle diameter of more than 10 탆 and less than 38 탆, Resin, a vinyl chloride resin composition containing the same, and a process for producing the same.
According to the present invention, there is provided an effect of providing a blend resin having a small plasticizer absorption rate and excellent processability, a vinyl chloride resin composition containing the same, and a process for producing the same.

Description

FIELD OF THE INVENTION The present invention relates to a blend resin having excellent processability, a vinyl chloride resin composition containing the same,

The present invention relates to a blend resin having excellent processability, a vinyl chloride resin composition containing the same, and a method for producing the same. More specifically, the present invention relates to a blend resin having a small plasticizer absorption rate and excellent processability, a vinyl chloride resin composition containing the same, .

Vinyl chloride resin is one of the general purpose plastic resins which are cheaply used, excellent in processability and easy to be polymerized and used throughout life and industry, and widely divided into paste vinyl chloride resin and straight vinyl chloride resin.

In general, the straight vinyl chloride resin is prepared by a suspension polymerization method with a particle size of about 150 μm, and the paste vinyl chloride resin is produced by an emulsion polymerization method with a particle size of about 0.1 to 2 μm.

The paste vinyl chloride resin may be processed with a plastisol containing various additives such as a plasticizer and a heat stabilizer. It is important that the plastisol has a low viscosity and good flowability for processability.

As a method for maintaining the low viscosity and the preferable flowability of the plastisol, a method of adding a predetermined amount of a straight vinyl chloride resin (usually called a blend resin) having a large particle size to a plastisol is usually used.

However, the conventional straight-chain vinyl chloride resin produced by the suspension polymerization has a too large particle size, so that when the compounded plastisol is applied to a coating, painting or film, etc., uniformity and stability are deteriorated.

Therefore, in order to reduce the particle size of the straight vinyl chloride resin, a method of adding an excessive amount of a dispersing agent or increasing a stirring speed during suspension polymerization is used. However, in this method, a straight vinyl chloride resin There is a limit to making.

In order to solve the problems of the prior art as described above, it is an object of the present invention to provide a blend resin having a small plasticizer absorption rate and excellent processability, a vinyl chloride resin composition containing the same, and a process for producing the same.

These and other objects of the present disclosure can be achieved by all of the present invention described below.

In order to achieve the above object, the present invention provides a blended resin characterized by being a straight vinyl chloride resin having an average particle diameter of more than 10 mu m and less than 38 mu m and a particle size distribution of 0.1 to 5.0.

The present invention also provides a vinyl chloride resin composition comprising the blend resin and the paste vinyl chloride resin.

In addition, the present invention relates to a method for preparing a polymer composition, which comprises: preparing a primary monomer mixture by first premixing polymerization water, an initiator, a dispersant, and a vinyl chloride monomer; And injecting an emulsifier into the primary monomer mixture and preparing a second monomer mixture by secondary preliminary blending.

As described above, according to the present invention, a blend resin having a small plasticizer absorption rate and excellent processability, a vinyl chloride resin composition containing the same, and a process for producing the same are provided.

Hereinafter, the present invention will be described in detail.

The blend resin of the present invention is characterized by being a straight vinyl chloride resin having an average particle diameter of more than 10 탆 and less than 38 탆 and a particle size distribution of 0.1 to 5.0.

The straight vinyl chloride resin may have an average particle diameter of 15 to 35 占 퐉 or 20 to 33 占 퐉, for example. Within these ranges, the processability, uniformity, and stability of the plastisol are excellent.

 The straight-chain vinyl chloride resin may have a particle size distribution of 0.1 to 2, 0.5 to 2.0 or 0.5 to 1.5, for example. Within this range, the uniformity and stability of the plastisol are excellent.

The straight vinyl chloride resin may have a large particle content (based on ASTM D1705, 100 mesh) of 0.01 to 10% by weight, 0.01 to 1% by weight, or 0.04 to 0.5% by weight.

The straight vinyl chloride resin may have a plasticizer absorption rate of 20% or less, 0.1 to 20%, 2 to 15%, or 5 to 11.0%, for example.

The plasticizer absorptivity in the present description means a value obtained by evaluating the amount of DOP absorbed by the vinyl chloride resin as a percentage by weight.

The straight vinyl chloride resin may be, for example, a vinyl chloride monomer alone or a monomer copolymerizable with a vinyl chloride monomer.

The copolymerizable monomer may be at least one selected from the group consisting of a vinyl ester compound, an aromatic vinyl compound, an acrylic acid compound, a monoolefin, and a vinylidene halide.

The blend resin may be added to improve the physical properties of the plastisol or the oligo-sol, for example. In this case, the processability of the plastisol or olgazole can be greatly improved.

The vinyl chloride resin composition of the present invention comprises the blend resin of the present invention; And a paste vinyl chloride resin.

The vinyl chloride resin composition of the present invention has a low plasticizer absorption rate, low viscosity and excellent processability.

For example, the vinyl chloride resin composition may include 5 to 50 parts by weight, 10 to 30 parts by weight or 10 to 20 parts by weight of the blend resin in 100 parts by weight of the paste vinyl chloride resin.

The paste vinyl chloride resin may have an average particle diameter of 0.1 to 10 占 퐉 or 5 to 10 占 퐉, for example. Within this range, uniformity and stability are excellent.

The vinyl chloride resin composition may further include a plasticizer and / or a heat stabilizer.

The plasticizer may be 10 to 200 parts by weight, 100 to 180 parts by weight, or 120 to 150 parts by weight based on 100 parts by weight of the paste vinyl chloride resin.

The vinyl chloride resin composition may be, for example, a plastisol or an oligosol.

The solvent that can be contained in the oligo sol is not particularly limited when it is a solvent used for a common vinyl chloride resin oligo sol.

The method for producing a vinyl chloride resin according to the present invention comprises the steps of: preliminarily mixing polymerized water, an initiator, a dispersant and a vinyl chloride monomer to prepare a first monomer mixture; And adding an emulsifier to the first monomer mixture and pre-mixing the mixture to prepare a second monomer mixture. The reason for putting the polymerization water, the initiator, the dispersant, and the vinyl chloride monomer after preliminary mixing without putting the emulsifier at the early stage is that when the emulsifier is added at the beginning, micelles are formed by the emulsifier, This is because a blend resin having a large particle diameter is obtained.

The polymerized water may be, for example, 50 to 500 parts by weight, 80 to 300 parts by weight, or 100 to 200 parts by weight based on 100 parts by weight of the vinyl chloride monomer.

Examples of the initiator include water-soluble initiators such as potassium persulfate, ammonium persulfate, hydrogen peroxide and the like; Benzoyl peroxide, lauryl peroxide, acetylcyclohexane oleooxide, 2,4,4-trimethylpentyl-2-peroxyneodecanoate,? -Cumylperoxy neodecanoate, dibutyl peroxydicarbonate, cumene Organic peroxide initiators such as hydroperoxide, t-butyl hydroperoxide and the like; Or an azo type initiator such as azobisisobutyronitrile, azobis-2,4-dimethylvaleronitrile, and the like.

The initiator is 0.01 to 2 parts by weight, 0.02 to 0.2 parts by weight, or 0.04 to 0.12 parts by weight based on 100 parts by weight of the total amount of the vinyl chloride monomer.

The dispersant may be, for example, partially saponified vinyl acetate resin, hydroxy cellulose, partially saponified polyvinyl alcohol, hydroxypropylmethyl cellulose, gelatin, acrylate, acrylate copolymer, polyethylene glycol, polyvinylpyrrolidone and maleic anhydride- Styrene copolymer resin, and in this case, there is an effect that the suspension stability is improved and the polymerization reaction proceeds efficiently.

In another example, the dispersant may be a partially saponified vinyl acetate resin having a degree of saponification of 70 to 90 mol% and a viscosity of 4 wt% aqueous solution of 30 to 60 cP, a 2 wt% aqueous solution of cellulose having a viscosity of 1,000 cP, A partially saponified polyvinyl alcohol having a viscosity of 70 to 99 mol% and a viscosity of 4 wt% aqueous solution at 20 DEG C of 5 to 110 cP, and a partially saponified polyvinyl alcohol having a degree of methoxy substitution of 18 to 33 wt% and a degree of hydroxypropoxy substitution of 4 to & 15% by weight and hydroxypropylmethylcellulose having a viscosity of 2 to 10% by weight at 20 DEG C of 10 to 500 cP.

The dispersant may be, for example, 0.01 to 2 parts by weight, 0.05 to 1 part by weight, or 0.1 to 0.6 part by weight based on 100 parts by weight of the total amount of the vinyl chloride monomer, and the stability of the vinyl chloride resin particles produced in this range is excellent The polyvinyl chloride resin is not formed and the surface of the paint layer or the film is not finally roughened and the fine particles are prevented from being formed excessively, have.

The vinyl chloride monomer may be used alone or in combination with a monomer capable of copolymerization.

The copolymerizable monomer may be at least one selected from the group consisting of a vinyl ester compound, an aromatic vinyl compound, an acrylic acid compound, a monoolefin, and a vinylidene halide.

The primary preliminary blending can be carried out, for example, for 0.1 minute to 10 hours, 1 minute to 1 hour, or 5 to 15 minutes, and in this case, the particle diameter of the vinyl chloride resin to be polymerized due to bonding with the emulsifier becomes excessively large .

The emulsifier is added during pre-mixing before the polymerization to further reduce the particle size of the vinyl chloride resin. Examples thereof include alkyl sulfates; Anionic emulsifiers; Polyethylene glycol and derivatives thereof; And polyepropylene glycol and a derivative thereof.

The double anionic emulsifier may be at least one selected from the group consisting of Sodium Lauryl Sulfate (SLS), Sodium dodecylbenzenesulfonate (SDBS), and Sodium laureth sulfate (SLES).

The emulsifier may be added in an amount of 0.01 to 1.5 parts by weight, 0.05 to 1 part by weight, 0.1 to 0.5 parts by weight, or 0.15 to 0.25 parts by weight based on 100 parts by weight of the total amount of the vinyl chloride monomer.

The secondary preliminary blending can be carried out, for example, for 1 minute to 10 hours, 5 minutes to 1 hour, or 10 minutes to 40 minutes. In this case, the stability of the reaction system can be further improved, The vinyl resin has an effect of having a low plasticizer absorption rate.

As another example, the method for producing the vinyl chloride resin of the present invention comprises the steps of: i) preparing a first monomer mixture by first premixing polymerization water, an initiator, a dispersant, and a vinyl chloride monomer; Ii) adding an emulsifier to the primary monomer mixture and preparing a second monomer mixture by secondary premixing; And iii) heating the secondary monomer mixture to a polymerization temperature to effect polymerization.

The polymerization temperature may be, for example, 40 to 80 ° C, 45 to 75 ° C, or 50 to 70 ° C.

As another example, the method for producing the vinyl chloride resin of the present invention comprises the steps of: i) preparing a first monomer mixture by first premixing polymerization water, an initiator, a dispersant, and a vinyl chloride monomer; Ii) adding an emulsifier to the primary monomer mixture and preparing a second monomer mixture by secondary premixing; Iii) polymerizing the secondary monomer mixture by heating to a polymerization temperature; And iv) adding the buffer during or after the polymerization.

The buffering agent has an effect of preventing the corrosion of the post-processing line due to the hydrochloric acid generated during the polymerization reaction, for example, during or after the polymerization reaction or when the polymer is transferred to the blowdown tank.

In another example, the buffer may be introduced either when the polymerization reaction has reached a blowdown pressure or immediately thereafter.

Examples of the buffer include NaHCO ₃ , Na ₂ B ₄ O ₇ , Na ₂ HPO ₄ , Na ₂ CO ₃ , KH ₂ PO ₄ , KH ₃ C ₄ O ₈ , NH ₄ OH, KHC ₄ H ₄ O ₆ , KHC ₈ H ₄ O _4, and Ca (OH) ₂ .

The buffer may be used in an amount of 0.001 to 1.5 parts by weight, 0.005 to 0.5 parts by weight, or 0.01 to 0.1 parts by weight based on 100 parts by weight of the vinyl chloride monomer. Within this range, the buffering agent may be added to hydrochloric acid It has the effect of preventing the corrosion of the post-processing line due to the etching.

The production method of the vinyl chloride resin of the present invention can be carried out in a state in which oxygen is removed by vacuuming the inside of the reactor to prevent oxygen from contacting with the vinyl chloride monomer.

The extent of vacuum and oxygen removal typically refers to vacuum and oxygen removal to the extent that vinyl chloride resin is prepared by suspending a vinyl chloride monomer.

The removal of the oxygen may be performed before or after the introduction of the polymerization water, the initiator, the dispersant, and the vinyl chloride monomer, for example.

The vinyl chloride resin of the present invention can be produced, for example, by recovering the unreacted residual vinyl chloride monomer after completion of the polymerization or suspension polymerization, separating the resin produced in the reactor, dehydrating it, and hot-air drying it, To obtain a vinyl chloride resin.

The reactor, the reflux condenser, the baffle and the stirrer, which are necessary for the above polymerization or suspension polymerization, are not particularly limited as long as they are commonly used in the production of the vinyl chloride resin by suspension polymerization in selecting the type and shape.

The blend resin of the present invention may be one produced by the production method of the vinyl chloride resin of the present invention. In this case, the blend resin has a small particle size and a low plasticizer absorption rate.

The blend resin produced by the production method of the present vinyl chloride resin may have a particle size of 10 to 100 mu m, 10 to 40 mu m, 10 mu m and 38 mu m, 15 to 35 mu m, or 20 to 33 mu m, for example.

The sheet of the present invention comprises a substrate layer and a coating layer or a coating layer laminated thereon, wherein the coating layer or the coating layer is composed of the vinyl chloride resin composition of the present invention.

The coating layer or the coating layer may be 50 탆 or less, or 30 to 50 탆, and within this range, uniformity and stability are excellent.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention within the scope and spirit of the following claims, Such variations and modifications are intended to be within the scope of the appended claims.

[Example]

Example  One

Reflux condenser and a stirrer, etc. is installed dwan 1m ³ capacity 100 parts by weight of the total vinyl chloride monomer in a high pressure reactor, 130 parts by weight of deionized water, a dispersant, hydroxypropyl methyl cellulose, 0.4 part by weight, the reaction initiator t- butylperoxy neo to the And 0.04 parts by weight of canoide (BND) were added thereto in a batch, followed by applying a vacuum and pre-mixing for 5 minutes to 15 minutes. Then, 0.24 parts by weight of sodium dodecylbenzenesulfonate as an emulsifier was added to the reactor, and the mixture was preliminarily mixed for 20 minutes and then heated to 58 ° C to carry out a polymerization reaction.

When the polymerization reaction reached the blowdown pressure, 0.0115 parts by weight of NaHCO ₃ was added as a buffer to prevent corrosion of the post-processing line which was transferred to the blowdown tank by hydrochloric acid generated during the reaction, and the polymerization reaction was terminated. Thereafter, the unreacted residual vinyl chloride monomer was recovered, and the vinyl chloride resin was separated in the reactor, dehydrated and hot-air dried to prepare a powdered vinyl chloride resin.

Example  2

The procedure of Example 1 was repeated, except that sodium dodecylbenzenesulfonate as an emulsifier was added in an amount of 0.12 parts by weight in Example 1.

Example  3

The procedure of Example 1 was repeated, except that 0.3 part by weight of sodium dodecylbenzenesulfonate, which is an emulsifier, was added in Example 1.

Example  4

The same procedure as in Example 1 was performed except that the second preliminary mixing was performed for 10 minutes in Example 1 above.

Example  5

The procedure of Example 1 was repeated, except that the second preliminary mixing was carried out for 40 minutes.

Comparative Example  One

The procedure of Example 1 was repeated except that the sodium dodecylbenzenesulfonate emulsifier was not added and the second preliminary mixing was not performed in Example 1.

Comparative Example 2

In the same manner as in Example 1, except that sodium dodecylbenzenesulfonate, which is an emulsifier, was added during the first preliminary mixing in Example 1, and that the second preliminary mixing was not performed Respectively.

[Test Example]

The properties of the vinyl chloride resin prepared in Examples 1 to 5 and Comparative Examples 1 and 2 were measured by the following methods, and the results are shown in Table 1 below.

* Average Particle Diameter: The weight average particle diameter was measured according to ASTM D1705.

* Large particle content: The amount of the sample left without passing through 100 mesh in accordance with ASTM D1705 was expressed as% by weight with respect to the total sample used in the measurement.

* Plasticizer absorption rate: The amount of DOP absorbed into the sample in accordance with ASTM D3367-95 is expressed as% by weight with respect to the amount of sample before absorption.

* Particle size distribution: It refers to the width of the particle size distribution curve. If the particle size is broadly distributed, it has a large value, and if the particle size is narrowly distributed, it has a small value, and its specific value is calculated by the following formula.

[Equation 1]

D _{(V, 0.9)} -D _{(V, 0.1)} ] / D _{(V, 0.5)}

D _{(V, 0.1)} , D _{(V, 0.5)} and D _{(V, 0.9)} represent the sizes of the particles when the volume of the sample is 10%, 50% and 90%, respectively.

Property evaluation items Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 Particle size (탆) 20 31 24 33 28 38 404 Large particle content (%) 0.05 0.22 0.04 0.30 0.11 0.26 96 Plasticizer absorption rate (%) 9.2 10.7 9.4 11.9 9.7 11.7 - Particle size distribution 1.0 1.4 1.2 1.5 1.2 1.5 1.7

As shown in Table 1, the vinyl chloride resin, that is, the blend resin (Examples 1 to 5) according to the present invention had an average particle size suitable for improving processability, a low plasticizer absorption rate and a narrow particle size distribution, (Comparative Example 1) prepared in Example 1 and the emulsifier (Comparative Example 2) prepared by adding an emulsifier at the time of the first preliminary blending (Comparative Example 2) had a large particle content and a plasticizer absorptivity contrary to workability, It was confirmed that the particles had an average particle diameter of not less than 20 nm.

In the case of Example 1 in which 0.24 parts by weight of an emulsifier was added and the mixture was pre-mixed for 20 minutes (Examples 2 and 3) and the case where the amount of the emulsifier was changed (Examples 4 and 5), it was confirmed that the average particle size, the plasticizer absorption rate, and the particle size distribution were more suitable for improving the workability.

Further, in Example 3 in which a large amount of emulsifier was added, the plasticizer absorption rate was similar to that in Example 1, but the average particle size was increased unexpectedly, so that the economics and physical properties were slightly lowered.

In addition, in Example 5 in which the secondary pre-mixing time was extended, the average particle size and the plasticizer absorption rate were somewhat higher than those in Example 1. As a result, the productivity and physical properties were all slightly lowered.

Claims (18)

delete delete delete delete delete delete Preparing a primary monomer mixture by first premixing polymerization water, an initiator, a dispersant, and a vinyl chloride monomer; And introducing an emulsifier into the primary monomer mixture and subjecting the mixture to a secondary preliminary blending to prepare a secondary monomer mixture
A method for producing a vinyl chloride resin. 8. The method of claim 7,
The method for producing a vinyl chloride resin may further include the step of adding a buffering agent during or after the polymerization reaction
A method for producing a vinyl chloride resin. 9. The method of claim 8,
The buffering _{agent, NaHCO 3, Na 2 B 4} O 7, Na 2 HPO 4, Na 2 CO 3, KH 2 PO 4, KH 3 C 4 O 8, NH 4 OH, KHC 4 H 4 O 6, KHC 8 H ₄ O ₄ and Ca (OH) ₂ .
A method for producing a vinyl chloride resin. 8. The method of claim 7,
Characterized in that the primary preliminary mixing is carried out for 1 minute to 10 hours
A method for producing a vinyl chloride resin. 8. The method of claim 7,
Characterized in that the secondary preliminary mixing is carried out for 1 minute to 10 hours
A method for producing a vinyl chloride resin. 8. The method of claim 7,
Wherein the initiator is 0.01 to 2 parts by weight based on 100 parts by weight of the total amount of the vinyl chloride monomer
A method for producing a vinyl chloride resin. 8. The method of claim 7,
Wherein the dispersant is 0.01 to 2 parts by weight based on 100 parts by weight of the total amount of the vinyl chloride monomer
A method for producing a vinyl chloride resin. 8. The method of claim 7,
The dispersant may be at least one selected from the group consisting of partially saponified vinyl acetate resin, hydroxy cellulose, partially saponified polyvinyl alcohol, hydroxypropylmethyl cellulose, gelatin, an acrylate, an acrylate copolymer, polyethylene glycol, polyvinylpyrrolidone and maleic anhydride- And a copolymer resin.
A method for producing a vinyl chloride resin. 8. The method of claim 7,
Wherein the emulsifier is 0.01 to 1.5 parts by weight based on 100 parts by weight of the total amount of the vinyl chloride monomer
A method for producing a vinyl chloride resin. 8. The method of claim 7,
The emulsifier may be selected from the group consisting of alkyl sulfates; Anionic emulsifiers; Polyethylene glycol and derivatives thereof; And polyepropylene glycol and a derivative thereof. The polyurethane resin according to any one of
A method for producing a vinyl chloride resin. delete delete