KR20050021042A - Method for manufacturing poly vinyl chloride compounds and pvc compounds - Google Patents

Abstract

PURPOSE: Provided are a poly(vinyl chloride) resin composition which is remarkably improved in impact resistance and tensile strength and is excellent in processability, and its preparation method. CONSTITUTION: The poly(vinyl chloride) resin composition comprises 100 parts by weight of a poly(vinyl chloride) resin; 2-3 parts by weight of a lead-based composite stabilizer; 0.5-1 parts by weight of a calcium-based single-component stabilizer; 1-4 parts by weight of PA822 as a processing aid; 1-5 parts by weight of nano-sized light calcium carbonate; 3-5 parts by weight of general light calcium carbonate (coated with stearic acid by 1 micrometer); and 2-5 parts by weight of an impact modifier. Preferably the lead-based composite stabilizer comprises trilead sulfate, dibasic lead sulfate, lead stearate, calcium stearate, a wax and stearic acid in a ratio of 2 : 1.5 : 2 : 3 : 0.8 : 0.7 by weight.

Description

The manufacturing method and polyvinyl chloride resin composition of polyvinyl chloride resin composition TECHNICAL FIELD

The present invention relates to a polyvinyl chloride resin composition and a method for producing a polyvinyl chloride resin composition in which impact resistance, tensile strength, and excellent workability, and nano-size hard coal are added at a predetermined ratio.

In general, a composition made of polyvinyl chloride resin has excellent physical characteristics and chemical resistance, and thus is widely used in various parts such as pipes, building materials, wires and cables, films, and the like. However, since the processing temperature of the composition itself is close to the thermal decomposition temperature of the polyvinyl chloride resin, the molding conditions are extremely limited, and the physical properties thereof are also inconsistent. Although various heat stabilizers and processing aids are used to compensate for these disadvantages, it is also true that these additives also hinder the intrinsic properties of polyvinyl chloride resin. In particular, ABS (Acrylonitrile butadiene styrene terpolymer) or MBS (Methacrylate butadiene styrene) impact reinforcement is used in terms of impact strength reinforcement. These materials have double-sided properties such as tensile strength decreases as impact strength increases. Careful consideration should be given to the selection of, and careful determination of the content of polyvinyl chloride resins also affects the gelation time, flow marks, and flowability of polyvinyl chloride resins.

However, neither of these techniques can sufficiently improve the processability while maintaining the excellent physical and chemical properties of vinyl chloride. For example, when a plasticizer is added to polyvinyl chloride, or the vinyl chloride resin which copolymerized another monomer to vinyl chloride is used, the physical property of the obtained molded object changes large. The main purpose of mixing other resin components in polyvinyl chloride is to lower the melt temperature during molding and to lower the processing temperature. These methods seemingly improve the fluidity of polyvinyl chloride, but in reality the kneading energy is consumed by the flow, and thus the gelation of polyvinyl chloride is insufficient. Therefore, the product has a good gloss appearance but good product condition, but the physical properties of polyvinyl chloride are inferior to those of sufficiently gelled polyvinyl chloride.

In order to solve the above problems, Japanese Patent Laid-Open No. 40-5311 discloses that in addition to the superior amount of acrylic acid ester or methyl methacrylate in the presence of latex of a copolymer containing a superior amount of relatively high molecular weight methyl methacrylate. The method of mix | blending the two-stage copolymer which superposed | polymerized the methacrylic acid ester of as a processing aid was proposed. However, the added processing aid is likely to remain ungelled (usually silver EYES), which may damage the appearance of the product. In addition, there has been a problem that the effect of addition of processing aids, such as improvement of product gloss and improvement of secondary workability, is not sufficiently expressed.

The present invention has been made in order to solve the above problems, and produced a lead-based composite stabilizer specially manufactured for the compatibility (appearance, processability) of the nano-size hard coal with the vinyl chloride resin composition, through the processing aid And a method for producing an extruded polyvinyl chloride resin composition containing hard coal having a small amount of nano-size and having excellent physical properties and processability with high tensile strength and impact resistance, as invented by experimenting the proper ratio of the impact modifier. And it is an object of the present invention to provide a polyvinyl chloride resin composition.

In order to achieve the above object, the present invention is 100 parts by weight of polyvinyl chloride resin, 2 to 3 parts by weight of lead-based composite stabilizer, 0.5 to 1 parts by weight of calcium-based single stabilizer, 1 to 4 parts by weight of processing aid, nano-size hard coal 1 Polyvinyl chloride resin composition in which nano-size hard coal, which has a significantly increased impact resistance and tensile strength, has been added to 5 parts by weight, 3 to 5 parts by weight of ordinary hard coal (coating 1 micron), and 2 to 5 parts by weight of an impact modifier. The manufacturing method and polyvinyl chloride resin composition are related.

As the physical and chemical properties of nano-sized particles have been recently identified and their useful values have emerged, their applications are rapidly increasing in the fields of semiconductors, LCDs, PDPs and MEMS, from biotechnology and functional window materials. It is true that it is rising. The initial nanoscale representative material is carbon nanotubes. One of the characteristics of carbon nanotubes is that their physical strength increases significantly when kneaded in various alloys. In addition, the situation is currently developing nano-powders of various functions. It is well known that nano-size hard coals have high impact strength and tensile strength if they are applied to general purpose resins under the assumption that constant dispersibility is ensured. In order to supplement the above-mentioned disadvantages of the polyvinyl chloride resin composition, research on nano-size hard coal has been conducted. As a result, a composition having high tensile strength and strong impact resistance in a poly-vinyl chloride composition to which nano-size hard coal is added Was invented.

Therefore, the nano-size hard coal used in the present invention refers to CaCO 3 nanopowder, NPCC, nano-scale precipitated calcium carbonate (Precipitated nano sized calcium carbonate).

Looking at the composition of the polyvinyl chloride composition used in the present invention,

1) 100 parts by weight of polyvinyl chloride resin

2) 2-3 parts by weight of a lead-based composite stabilizer

3) 0.5-1 weight part of calcium-based single stabilizer

4) 1 to 4 parts by weight of processing aid

5) 1 to 5 parts by weight of nano-size hard coal

6) General hard coal (coating 1 micron) 3 to 5 parts by weight

7) The present invention relates to a polyvinyl chloride resin composition having a markedly increased impact resistance and tensile strength of 2 to 5 parts by weight of an impact modifier.

In addition, in order to ensure the compatibility of nano-size hard coal and polyvinyl chloride resin, nano-size hard coal surface treatment, the compatibility of nano hard coal and general polyvinyl chloride (PVC) resin, impact and tensile strength reinforcement And a ratio of a lead-based composite stabilizer to ensure moldability, an impact modifier, and a processing aid, and a compounding temperature, a mixing time, and a cooling time of a super mixer for maintaining dispersibility.

The polyvinyl chloride resin used in the present invention is a suspension or bulk polymerized polyvinyl chloride resin having a degree of polymerization of 1000.

Lead-based, calcium-based stabilizers mentioned above are common stabilizers in the art. As the processing aid, LG Chem was used to emulsion-polymerize the acrylate monomer.

Plastic impact modifiers are inherently fibrous insoluble materials that are added to plastics to increase their fracture, tensile, compression, warpage, and impact strength. In addition, enhancement of dimensional stability and resistance to thermal deformation can generally be achieved by reinforcing agents. The fibers coat a coupling agent to increase their adhesion to the plastic. Thermosetting resins require the most amount of reinforcement and also reinforce thermoplastics and plastic foams. Most of polyvinyl chloride (PVC) is structurally weak in impact resistance, processing fluidity, and heat deformation, and thus, it is necessary to support improvement of physical properties and processability by developing additives for commercialization. PVC impact modifiers are generally added to hard PVC and applied to impact resistance reinforcement, and impact modifiers are classified into three types according to their components.

First, polyvinyl chloride (PVC) impact modifiers are graft polymerized polymer rubbers based on methacrylate butadiene styrene (MBS), acrylic and acrylonitrile butadiene styrene (Acrylic). terpolymer (ABS) and the like are present in the form of PVC and two phases blended.

Second, there are chlorinated polyethylene (CPE) and ethylene vinyl acetate (EVA) as semicompatile plasticizing polymers. Third, there is also an inorganic impact modifier coated with stearin on an inorganic calcium carbonate.

In the early 50s, ABS was used as a PVC impact modifier, but in the late 50s, methacrylate butadiene styrene (MBS) impact modifier was developed and replaced by Rohm & Haas. As the PVC bottle and packaging market grew rapidly in the US and Europe in the 1960s, Kanegafuchi developed impact modifiers such as MBS and MABS in Japan. In the 70's, with the formation of a window market with excellent thermal insulation, leading to Germany, DOW developed CPE, which transformed the HDPE process, into an acrylic impact modifier with excellent Rohm & Haask weather resistance and impact resistance. MBS is a typical resin of PVC impact modifiers and is divided into opaque (high impact), transparent, and whitening.

Methacrylate butadiene styrene (MBS) is a copolymer obtained by grafting MMA and SM to diene rubber, which is used in hard and semi-rigid PVC products to improve impact strength and promote processability. Do it.

Acrylic is produced from BA, MMA, SM, MBS is produced using SBR, MMA, SM and processing aids are using MMA. Accordingly, it is pointed out that it is necessary to try to specialize products by selecting commercial items and securing manufacturing technology. In addition, high-quality polymer products are required to have high functionalization and high performance of additives. In particular, until they are recognized as specialty, they are defined as the result of complex interactions with polymers and other additives. It is pointed out that it should proceed.

Therefore, the impact modifier applied to the PVC used in the present invention uses the MBS system.

In a preferred embodiment of the present invention, the average particle diameter of the nano-size hard coal used as the impact modifier has a size of 40 nm, the general hard coal was used a product coated with stearic acid of 1 micron size.

The composition of the present invention may be used in addition to the above components in trace amounts depending on the desired physical properties of additional components such as colorants, fillers, antistatic agents.

Fillers are classified into two types: a bulk filler (Extender Filler) for the purpose of cost reduction and a reinforcing filler added to improve mechanical, thermal, electrical properties or processability. Fillers are generally formulated in large quantities compared to other additives, and in many cases 40 to 50% is used. When the filler is blended into the polymer, the effect is remarkably different depending on the chemical composition and shape. Therefore, the types of filler are classified into inorganic and organic according to the chemical composition, and powder, flat, needle, spherical, spherical, fibrous and fibrous depending on the shape. It is classified into a textile form. Among these fillers, fillers used in polyolefins include glass fiber, calcium carbonate, talc, mica, silica, wood powder, chalk, woolas-tonite, and the main purpose of fillers is to improve physical properties and processability, but Since the filler is blended, defects such as deterioration of physical properties may appear in some cases.

Calcium carbonate is most commonly used as a PVC filler because calcium carbonate is easy to use and various sizes of calcium carbonate can be freely used by wide particle size adjustment. In addition, the mixing process is less wearable, and has a relatively low specific gravity, so the volume cost is low. Asbestos, the second most popular PVC, is regulated by developed countries for carcinogen determination, and the third most popular clay is widely used in flooring, film, toys, decorations and wires.

Meanwhile, the domestic calcium carbonate market was 65,520 tons per year as of 1996. Among these, 312,000 tons of PVC fillers were 47.4%, papers were 240,000 tons, 36.7%, and paints were 16,520 tons. 2.5%, other glass, cement, pharmaceuticals, metallurgy, sugar, printing plate decoration, building material dispersant, hardness agent, chalk, food additives, etc., was used 85,000 tons, 13.1%.

Since the thermal stabilizer used in the present invention (PVC thermal stabilizer) is impossible to process without a thermal stabilizer due to the low thermal stability of polyvinyl chloride, a thermal stabilizer is necessary, and the PVC thermal stabilizer inhibits dehydrogenation reaction, It removes the starting point of hydrogen chloride reaction, automatic oxidation suppression, chain scission prevention, shortens the length of polyethylene and prevents the destruction of carbonium salt.

The lead-based composite stabilizer used in the present invention weighs TLS (TRI LEAD SULFATE), DBL (DIBASICLEAD SULFATE), Pb-ST (LEAD STEARATE), Ca-ST (CALCIUM STEARATE), WAX, ST-A (STEARIC ACID) Contrast 2: 1.5: 2: 3: 0.8: 0.7 is used in the compound, and the mechanism is observed. The reaction with HCl forms lead chloride (PbCl2), and lead chloride is PVC instability effect is small.

Lead stearate has a double effect with thermal stability and lubrication effect, which is excellent in electrical insulation, and is used for wire or cable wire coating, but because it is an opaque pigment, it cannot be used in projection products. It has the disadvantage of discoloring with sulfur-containing materials.

Ca (calcium-based) stabilizer used in the present invention uses Ca (OOCC ₁₇ H ₃₅ ) ₂ , and other rigid PVC, while rigid and oil-resistant, while difficult to process, acrylic processing aids to help processing. .

In general, the vinyl chloride resin composition of the present invention is mixed with a vinyl chloride resin and a lead-based, calcium-based stabilizer in a mixer, and added to the mixture hard nanoparticles of hard coal and processing aid, and then extruded through a extruder to produce pellets of a desired size. Get This is extruded to obtain an extrudate of the desired shape. Such a polyvinyl chloride resin composition is applied to various industrial and household products, for example, products such as impact sewer pipes and pipes for drip trays.

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

Example 1

100 g of polyvinyl chloride resin, 2 g of processing aids PA822 (Processing aids 822; LG Chemical), 4 g of nano-size hard coal, 5 g of ordinary hard coal (coating 1 micron), 5 g of methacrylate butadiene styrene (MBS), TLS (TRI LEAD SULFATE), DBL (DIBASIC LEAD SULFATE), Pb-ST (LEAD STEARATE), Ca-ST (CALCIUM STEARATE), WAX and ST-A (STEARIC ACID) 2: 1.5: 2: 3: 0.8 Compound 3g and Ca (OOCC ₁₇ H ₃₅ ) ₂ 0.5g mixed at a ratio of: 0.7 were mixed, and then mixed with a supermixer at 130 ° C for 10 minutes, and cooled for 30 minutes to prepare a polyvinyl chloride resin composition.

Example 2

100 g of polyvinyl chloride resin, 1 g of processing aid PA822, 4 g of nano-size hard coal, 5 g of ordinary hard coal (coating 1 micron), 5 g of methacrylate butadiene styrene (MBS), TLS (TRI LEAD SULFATE) and DBL (DIBASIC LEAD SULFATE) Compound 3g, Ca (OOCC) mixed with Pb-ST (LEAD STEARATE), Ca-ST (CALCIUM STEARATE), WAX and ST-A (STEARIC ACID) at a weight ratio of 2: 1.5: 2: 3: 0.8: 0.7 ₁₇ H ₃₅ ) ₂ 0.5g was mixed, and then mixed with a supermixer at 130 ° C. for 10 minutes, and cooled for 30 minutes to prepare a polyvinyl chloride resin composition.

Example 3

100 g of polyvinyl chloride resin, 3 g of processing aid PA822, 4 g of nano-size hard coal, 5 g of ordinary hard coal (coating 1 micron), 5 g of methacrylate butadiene styrene (MBS), TLS (TRI LEAD SULFATE) and DBL (DIBASIC LEAD SULFATE) Compound 3g, Ca (OOCC) mixed with Pb-ST (LEAD STEARATE), Ca-ST (CALCIUM STEARATE), WAX and ST-A (STEARIC ACID) at a weight ratio of 2: 1.5: 2: 3: 0.8: 0.7 ₁₇ H ₃₅ ) ₂ 0.5g was mixed, and then mixed with a supermixer at 130 ° C. for 10 minutes, and cooled for 30 minutes to prepare a polyvinyl chloride resin composition.

Example 4

Polyvinyl chloride resin 100g, processing aid PA822 2g, nano-size hard coal 4g, ordinary hard coal (coating 1 micron) 5g, methacrylate butadiene styrene (MBS) 2g, TLS (TRI LEAD SULFATE) and DBL (DIBASIC LEAD SULFATE) 0.3g, Ca (Pb-ST (LEAD STEARATE), Ca-ST (CALCIUM STEARATE), WAX and ST-A (STEARIC ACID) mixed at a ratio of 2: 1.5: 2: 3: 0.8: 0.7 by weight) OOCC ₁₇ H ₃₅ ) ₂ 0.5g was mixed, and then mixed with a supermixer at 130 ° C. for 10 minutes, and cooled for 30 minutes to prepare a polyvinyl chloride resin composition.

Example 5

Polyvinyl chloride resin 100g, processing aid PA822 2g, nano-size hard coal 4g, ordinary hard coal (coating 1 micron) 5g, methacrylate butadiene styrene (MBS) 3g, TLS (TRI LEAD SULFATE) and DBL (DIBASIC LEAD SULFATE) Compound 3g, Ca (OOCC) mixed with Pb-ST (LEAD STEARATE), Ca-ST (CALCIUM STEARATE), WAX and ST-A (STEARIC ACID) at a weight ratio of 2: 1.5: 2: 3: 0.8: 0.7 ₁₇ H ₃₅ ) ₂ 0.5g was mixed, and then mixed with a supermixer at 130 ° C. for 10 minutes, and cooled for 30 minutes to prepare a polyvinyl chloride resin composition.

Example 6

100g polyvinyl chloride resin, 2g PA822 processing aid, 4g nano-size hardwood, 5g ordinary hardwood (coating 1 micron), 4g methacrylate butadiene styrene (MBS), TLS (TRI LEAD SULFATE) and DBL (DIBASIC LEAD SULFATE) Compound 3g, Ca (OOCC) mixed with Pb-ST (LEAD STEARATE), Ca-ST (CALCIUM STEARATE), WAX and ST-A (STEARIC ACID) at a weight ratio of 2: 1.5: 2: 3: 0.8: 0.7 ₁₇ H ₃₅ ) ₂ 0.5g was mixed, and then mixed with a supermixer at 130 ° C. for 10 minutes, and cooled for 30 minutes to prepare a polyvinyl chloride resin composition.

Experimental Example

100 parts by weight of a vinyl chloride resin (Hanhwa Chemical) of 1000 degree of polymerization, 1-4 parts by weight of a processing aid (LG Chemical, PA 822) and 2-3 parts by weight of a self-manufactured lead-based composite stabilizer, a calcium stabilizer (wire diameter) Hwaseong) 0.5-1 parts by weight, nano-size hard coal 2-5 parts by weight, MBS-based impact modifier 2-5 parts by weight, general hard coal 3-5 parts by weight mixed in a supermixer, 150 ℃ ~ 160 ℃ temperature in a twin screw extruder Primary pellet compound was used. After extruding by extruder at a temperature of 190 ℃ to prepare a specimen plate with a thickness of 2.9 ~ 3.2 mm and then processed into a specimen shape was measured, the flat, fall impact test to prepare a sewer pipe with a diameter of 100mm experiment KPPS M 301 It was measured by cutting according to the standard.

The specimen was left at 20 ° C. for 3 days and then subjected to the following experiment.

Fall impact test.

The fall impact test was conducted according to the KPPS M 301 fall impact test method.

Tensile Strength Test: Tensile strength is the maximum stress at which the material will break under tensile load. The maximum load divided by the original cross-sectional area of the test piece is shown in units of kg / cm 2.

Tensile property is a test item that measures various properties of a material when the material is pulled (pull the specimen from both sides) and is the most common item in the mechanical property test of plastics.

Tensile strength is divided into tensile strength at yield point and tensile strength at break point. Yield point means the force at the highest point that the material receives, and break point is the force at the point where the material breaks. to be. In order to calculate the tensile strength (kgf / ㎠) of the specimen was calculated according to the following equation.

TS = TS _t + 6.65 (t-15)

In the above formula, TS is tensile strength (kgf / cm 2) at 15 ° C., TS _t is tensile strength (kgf / cm 2) at t ° C., and t is the experimental temperature (5 to 35 ° C.).

Flatness test: Pipe stiffness was carried out according to the flatness test method of KPPS M 301.

Experimental Example 1

Samples were prepared in the same manner as in Example 1 using the high molecular weight processing aids and the impact modifiers in the amounts shown in Table 1 below, respectively, and the tensile strength, the fall impact strength, and the stiffness of the pipe were measured. The results are shown in Table 1 below.

Experimental Example 2

Samples were prepared in the same manner as in Example 1 using the high molecular weight processing aids and the impact modifiers in the amounts shown in Table 1 below, respectively, and the tensile strength, the fall impact strength, and the stiffness of the pipe were measured. The results are shown in Table 1 below.

<Table 1>

PVC resin (polymerization degree 1000) Processing aid Nano size General amazement Impact modifier Lead-Based Compound Stabilizer Calcium-based Stabilizer Flatness test (KN / cm2) Tensile Strength (㎏f / ㎠) Fall impact Example 1 100 2 4 5 5 3 0.5 403 548 Very good Example 2 100 One 4 5 5 3 0.5 395 542 Very good Example 3 100 3 4 5 5 3 0.5 394 544 Very good Example 4 100 2 4 5 2 3 0.5 392 491 Very good Example 5 100 2 4 5 3 3 0.5 388 510 Very good Example 6 100 2 4 5 4 3 0.5 382 520 Very good Comparative Example 1 100 4 4 5 5 3 0.5 364 492 Good Comparative Example 2 100 2 0 5 5 3 0.5 292 389 Defective Comparative Example 3 100 2 4 5 6 3 0.5 390 395 Good Comparative Example 4 100 2 4 5 One 3 0.5 325 444 Good

From the results shown in Table 1, by using an appropriate amount of a high molecular weight processing aid and an impact modifier, the impact resistance and tensile strength were simultaneously improved (Examples 1 to 6). In the case of vinyl chloride resin, even though the impact modifier content is increased, the physical properties do not improve, but the physical properties deteriorate. In addition, in the case of Comparative Examples 1 to 4, it was found that deterioration of physical properties also occurred when an excessive amount of the processing aid or an excessive or insufficient amount of the impact modifier was added.

Experimental Example 3

Each of the examples specified in Table 3 below are the results of changing the processing conditions of the examples in Table 1 indicated above, and the specimens were manufactured under the same conditions. Tensile and impact strengths were measured using this specimen. The measurement method for formability was measured based on Table 2 as follows. The results are shown in Table 3 below.

<Table 2>

Flow Polish Dimensional stability Silver dot Judgment Test 1 Good U Good Not Occurred Good Test 2 usually Inadequate usually Slightly usually Test 3 Good radish Inadequate Severe occurrence Defective

As in Table 1, a specimen was prepared in the same manner as in Example 1, and the moldability, tensile strength, and fall impact were measured using the specimen. The results are shown in Table 3 below.

<Table 3>

Degree of polymerization Mixing temperature Compounding time Cooling time Sexuality Tensile Strength (㎏f / ㎠) Fall impact Example 1 1000 140 10 30 Good 544 Very good Example 2 1000 125 10 30 Good 548 Very good Example 3 1000 130 10 30 Good 542 Very good Comparative Example 1 1000 130 6 12 usually 408 Good Comparative Example 2 1000 120 4 10 Defective 402 Bad Comparative Example 3 1000 110 2 8 Defective 350 Bad Comparative Example 4 1000 150 6 12 Defective 402 Bad Comparative Example 5 1000 140 4 10 Defective 365 Bad Comparative Example 6 1000 130 2 8 Defective 343 Bad

As described in Table 3 above, it can be seen that the difference in physical properties is severe when compared with the blending processing conditions in Examples 1,2 and 3 and the conditions in Comparative Examples 1 to 6.

Experimental Example 4

Each of the examples specified in Table 4 below was written as to whether the moldability and uniform physical properties are shown by changing the surface treatment conditions of the nano-sized hard coal in the examples shown in Table 1 above. Moldability was measured by the criteria shown in Table 2 above. Measurement criteria for uniform physical properties were entered based on the contents described in Table 4.

<Table 4>

Test sample volume Number of specimens Tensile strength deviation Flat test deviation Judgment Exam 1 120KG 500 ± 10 ± 10 Good Exam 2 120KG 500 ± 20 ± 15 usually Exam 3 120KG 500 ± 50 ± 50 Defective

The process of changing the surface treatment conditions of the nano-sized hard coal is shown in Figs.

1 is a block diagram showing a process of making compound pellets using a twin-screw extruder after compounding nano-size hard coal and PVC resin and additives with a supermixer at room temperature to 140 ° C.

Figure 2 is another process of compounding the nano-sized hard coal with stearic acid in a first super mixer, compounding pvc resin and additives with a super mixer at room temperature to 140 ℃ at room temperature and then cooling the compound pellet using a twin screw extruder Is a block diagram showing

Figure 3 is compounding the nano-sized hard coal with stearic acid in the first supermixer and then secondary processing to 5-10mm through a twin screw extruder compounding the pvc resin and additives at room temperature to 140 ℃ in a supermixer Block diagram showing another process of making compound pellets using a twin screw extruder after cooling.

Comparative Examples 1 and 2

As in Table 2, a specimen was prepared in the same manner as in Example 1, and moldability, tensile strength, and flatness were measured using the specimen. The results are shown in Table 5 below.

<Table 5>

Sexuality Uniformity of physical properties Example 1 (Fig. 3) Good Good Comparative Example 1 (Fig. 2) usually usually Comparative Example 2 (Fig. 1) Defective Defective

As shown in Table 5, it can be seen that there are many differences in the formability of the compound and the uniformity of physical properties according to whether nano-size hard coal is pretreated.

The present invention as described above was invented by experimenting the appropriate ratio of lead-based composite stabilizer, processing aids and impact modifiers, having excellent physical properties and processability with high tensile strength and impact resistance, and a small amount of nano-size hard coal By containing it, there exists an effect that physical properties, such as high tensile strength and impact resistance, are improved.

1 to 3 are block diagrams showing the surface treatment conditions of the nano-size hard coal of the present invention

Claims (4)

In the polyvinyl chloride resin composition, 100 parts by weight of polyvinyl chloride resin, 2 to 3 parts by weight of lead-based composite stabilizer, 0.5 to 1 part by weight of calcium-based single stabilizer, PA822 1 to 4 parts by weight of processing aid, nano-size hard coal 1 Nano-size hard coal, which has a significant increase in impact resistance and tensile strength, is composed of -5 parts by weight, 3 to 5 parts by weight of ordinary hard coal (coating 1 micron), and 2 to 5 parts by weight of impact modifier. Polyvinyl chloride resin composition. The method of claim 1, wherein the lead-based composite stabilizer is TLS (TRI LEAD SULFATE), DBL (DIBASIC LEAD SULFATE), Pb-ST (LEAD STEARATE), Ca-ST (CALCIUM STEARATE), WAX and ST-A (STEARIC ACID) Polyvinyl chloride resin composition characterized in that the compound mixed with a compound mixed in a ratio of 2: 1.5: 2: 3: 0.8: 0.7 by weight. In the method for producing a polyvinyl chloride resin composition, 100 parts by weight of polyvinyl chloride resin, TLS (TRI LEAD SULFATE), DBL (DIBASIC LEAD SULFATE), Pb-ST (LEAD STEARATE), Ca-ST (CALCIUM STEARATE) and WAX 2 to 3 parts by weight of a lead-based composite stabilizer mixed with ST-A (STEARIC ACID) in a ratio of 2: 1.5: 2: 3: 0.8: 0.7, Ca (OOCC ₁₇ H ₃₅ ) ₂ 0.5 1 to 4 parts by weight, 1 to 4 parts by weight of PA822 as a processing aid, 1 to 5 parts by weight of nanosize hard coal, 3 to 5 parts by weight of ordinary hard coal (coating 1 micron), 2 to 5 parts by weight of impact modifier, and then A method for producing a polyvinyl chloride resin composition, characterized in that the mixture is stirred for 10 minutes at room temperature to 140 ° C. and then cooled for 30 minutes. The method of claim 3, wherein the nano-sized hard coal is surface treated (coated) with stearic acid, compounded with a first super mixer, and then processed into 5-10 mm through a twin screw extruder, followed by PVC resin and additives. Compounding a polyvinyl chloride resin composition characterized in that the compound is made into compound pellets using a twin screw extruder after cooling by compounding at room temperature to 140 degrees in a supermixer.