KR100869590B1 - Polyvinyl chloride nano composite and manufacturing method thereof - Google Patents

Abstract

A polyvinyl chloride nano composite and a manufacturing method thereof are provided to improve excellent flexural strength, impact strength and thermal stability by uniformly distributing the exfoliated layered silicate within the vinyl chloride resin uniformly. A polyvinyl chloride nano composite comprises 100 parts by weight of a polyvilyl chloride(PVC); 0.5-10 parts by weight of layered silicate; and 1-15 parts by weight of talc. The layered silicate is selected from a group consisting of montmorillonite, saponite, hectorite and their combination. The mixing step is carried out at a temperature of 175-195 deg.C.

Description

Polyvinyl chloride nano composite and manufacturing method

The present invention relates to a vinyl chloride resin nanocomposite, and more particularly, to a vinyl chloride resin nanocomposite having excellent flexural strength, impact strength and thermal stability by uniformly dispersing the exfoliated layered silicate in the resin. It is about.

 Polyvinyl chloride (PVC) is widely used in various applications such as films, wallboards, sheets, and pipes, depending on the hard or soft form of the material. Molded plasticizer is added to the vinyl chloride resin, or a small amount of plasticizer is called rigid polyvinyl chloride resin, and 30 to 50 parts by weight of the plasticizer is added to 100 parts by weight of the vinyl chloride resin. polyvinyl chloride resin).

In the case of the double PVC, the price is cheap, easy to construct and excellent in chemical resistance has been widely used as a piping agent in an environment that is vulnerable to corrosion by the surrounding chemicals. However, when used as a material for joint pipes of underground drain pipes or underground transverse pipes, rigid PVC is not a brittle thermoplastic polymer, and thus does not withstand high pressure.

The organic-inorganic nanocomposites that can overcome the limitations of the existing polymer organic materials and have synergistic effects between constituent materials and functions are new materials in which nanotechnology and organic materials represented by polymers are combined. Such organic-inorganic nanocomposites can disperse nano-sized inorganic fillers in the polymer matrix to improve the physical properties of the polymer resin or to impart new properties that the polymer resin did not have. Known.

In general, tap water is moved through water and sewage pipes or underground pipes, and their pipes are usually composed of cast iron pipes and PVC pipes.

In the case of cast iron pipes, the mechanical strength is considerable, but after a long time, the corrosion rate is good, not only the rust inside, but also the sludge is entangled, so the water flow rate decreases. And, if the rust is rusted easily when a high load or impact is applied, it may be expensive to require frequent repair or replacement.

 In recent years, PVC materials have been started to manufacture materials to reinforce flexural and impact strength by mixing modifiers such as methacrylate-butadiene-styrene (MBS), but these materials show poor moldability and weather resistance.

Therefore, when the MBS-based reinforcing agent is used, the impact resistance can be increased by the influence of the low glass transition temperature (Tg) of the rubber system, but it is weak to ultraviolet rays and causes a problem of increasing resistance in the extruder. There is this.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a vinyl chloride resin nanocomposite having a higher flexural strength, impact strength, and thermal stability than a conventional vinyl chloride resin, and a method of manufacturing the same.

In order to solve the above technical problem, an aspect of the present invention provides a vinyl chloride resin nanocomposite comprising a polyvinyl chloride (PVC) and layered silicate.

In another aspect of the present invention, preparing a vinyl chloride resin and a layered silicate; And a step of kneading the vinyl chloride resin and the layered silicate.

As described above, in the present invention, the vinyl chloride resin nanocomposite uniformly distributes the exfoliated layered silicate in the vinyl chloride resin, thereby showing better flexural strength, impact strength, and thermal stability as compared with the conventional hard vinyl chloride resin. It can be used as a building material, and in particular, it can replace the existing cast iron pipe.

Inorganic fillers that determine the properties of nanocomposites include metal nanoparticles, nano-sized spherical or plate-like stacks of ceramic components, and nano-sized new carbon-based materials represented by fullerenes or carbon nanotubes. Are being studied.

However, unlike organic components that perform various chemical reactions on a molecular basis, inorganic fillers are not easy to make stable at nano size, and a lot of effort is required in the manufacturing process.

In the preparation of nanocomposites, the shape of the layered silicates used, ion exchange capacity, charge density, and affinity with the organic material penetrating between the silicate layers are important factors. In general, it is known that polar molecules have affinity with polar molecules, and nonpolar molecules have affinity with nonpolar molecules.

The polar groups contained in the polymer to some extent help the polymer chain to be inserted between the silicate layers, but too much polar groups are known to be hindered, and obtaining a peeled structure in a thermodynamically stable state is very difficult and expensive. do.

Accordingly, the present invention provides a vinyl chloride resin nanocomposite having excellent tensile strength, flexural strength, impact strength and thermal stability by uniformly dispersing the peeled layered silicate in the vinyl chloride resin, and the peeled layered silicate in the vinyl chloride resin. It is an object of the present invention to provide a method for preparing a vinyl chloride resin nanocomposite that enables uniform distribution.

According to an aspect of the present invention, the vinyl chloride resin nanocomposite includes polyvinyl chloride (PVC) and layered silicate;

According to an embodiment of the present invention, the vinyl chloride resin nanocomposite may further include 1 to 15 parts by weight of talc based on 100 parts by weight of vinyl chloride resin.

According to another aspect of the present invention, there is provided a piping material comprising the vinyl chloride resin nanocomposite according to the present invention.

Hereinafter, each component of the vinyl chloride resin nanocomposite according to the present invention will be described in detail.

 (a) vinyl chloride resin

Vinyl chloride resin is a typical general purpose plastic that is used in a wide range of applications from building materials to household goods because of its low price, excellent physical and chemical properties, and excellent processing properties in calendering, extrusion and injection.

Hard vinyl chloride resin is used as a hard pipe for water pipes, chemical plant piping, industrial materials, and corrugated boards and tiles as building materials. Soft vinyl chloride resin is used as a film or sheet for packaging, furnishings, bags, shoes, raincoats, etc. The film is used in large quantities as an agricultural vinyl house because it transmits ultraviolet rays well. When vinyl chloride resin is used to coat wires and cables, it is superior to rubber coating. That is, it is excellent in nonflammability, and excellent in aging resistance, oxidation resistance, oil resistance, chemical resistance, water resistance and flame resistance.

(b) layered silicate

Layered silicate is a clay mineral with a very large surface area of 800 square meters per gram on average and has a structure of several tens to hundreds of very thin sheets of approximately 1 nm in thickness and 30 nm to 1000 nm in length.

The structural characteristics of the layered silicates show that there are various kinds of inorganic compounds having a layered structure in nature, and among them, the layered silicates, that is, the clay series, have various reactivity and spatial expansion capabilities. It was the main object.

The basic structure of the layered silicate is composed of a tetrahedral silica layer and an octahedral alumina layer, and the kaolinite structure is obtained through the condensation reaction of hydroxy (-OH) functional groups between the two layers. Is generated.

Unlike kaolinite, which consists of a silica layer and an alumina layer of 1: 1, the silicate of 2: 1 has pyrophylite-talc and smectite depending on the amount of negative charge inside. ), Vermiculite, illite, mica and the like. Of these, the smectite family represented by montmorillonite, saponite and hectorite is known to have an insertion tendency.

1 is a view showing a crystal structure of montmorillonite.

As shown in Figure 1, the crystal structure 10 of the montmorillonite is known that is based on the structure of the blood fill light (pyrophyllite), Mg ^{+ 2} instead of Al ³⁺ ions in the octahedron 14 in blood fill light layer structure , Fe is ^{+ 2,} Fe ^{+ 3} ions are, tetrahedron 12, the Si layer ^{4 +} ions instead of the Al ^{3 +} ions are isotropically substituted (isomorphous substitution) on the structure.

Therefore, the overall charge is negative, and the pure charge of montmorillonite is different depending on the degree of substitution. Montmorillonite natural state, and the positive charges, such as ^{Ca 2 +, K +, Na} + between the silicate layer 16 is present to tailor the balance of electric charge is formed as a whole an electric balance. On the other hand, the layered silicate has a large amount of polar groups on the surface along with the presence of ions, so that the hydrophilicity is so large that there is always a water molecule between layers, so when each layer is stacked, a constant van der Waals called an interlayer or gallery (van der Waals) A gap is formed.

The layered silicate used in the present invention may use montmorillonite, saponite or hectorite, but is not limited thereto. More preferably, montmorillonite is used. It is possible to use these substances alone or in admixture of two or more.

According to another preferred embodiment of the present invention, the montmorillonite is montmorillonite containing interlayer Na ⁺ , montmorillonite containing interlayer K ⁺ , montmorillonite containing interlayer Ca ^{2 +} , interlayer represented by the following formula (1) Montmorillonite containing organic matter or montmorillonite containing organic matter represented by the following formula (2) may be used, and more preferably, montmorillonite containing Na ⁺ between layers may be used. It is possible to use these substances alone or in admixture of two or more.

[Formula 1]

R ¹ is an alkyl group having 12 to 36 carbon atoms, an alkenyl group having 12 to 36 carbon atoms, a saturated fatty acid having 12 to 36 carbon atoms, or an unsaturated fatty acid having 12 to 36 carbon atoms.

[Formula 2]

R ² and R ³ are each independently an alkyl group having 12 to 36 carbon atoms, an alkenyl group having 12 to 36 carbon atoms, a saturated fatty acid having 12 to 36 carbon atoms, or an unsaturated fatty acid having 12 to 36 carbon atoms.

Here, fatty acid refers to a chain-shaped monocarboxylic acid, and is named because of the hydrolysis of fat. Normally in vivo, they make esters with glycerol or higher alcohols, and very little is present as a beneficial fatty acid. An ester with glycerol is called a lead and an ester with a higher alcohol. Fatty acids found in living organisms are mostly even-numbered and normal-chained, with carboxyl groups at the ends. In the saturated carbon chain, palmitic acid and stearic acid are important. Unsaturated oleic acid is found in almost all fats, and linoleic acid and linolenic acid are found in vegetable oils.

The chemical formula of oleic acid is C ₁₇ H ₃₃ COOH. Saturated fatty acids and unsaturated fatty acids are classified according to the kinds of fatty acids which are constituents of triglycerides, and unsaturated fatty acids are classified into monounsaturated fatty acids and polyunsaturated fatty acids according to the number of carbon double bonds. Oleic acid is a monovalent unsaturated fatty acid with only one double bond between carbon atoms.

Stearic acid is a saturated higher fatty acid with 18 carbon atoms and has the formula C ₁₈ H ₃₆ O ₂ . As an ester with glycerol, it is a fatty acid widely contained in fats and oils and phospholipids of animal and plant systems and present in a large amount in nature.

The chemical formula of palmitic acid is CH ₃ (CH ₂ ) ₁₄ COOH. It is insoluble in water but soluble in alcohol and ether. Along with stearic acid and oleic acid, it is widely distributed in the flora and fauna, and is contained in most fats and oils, especially in large amounts of bark and palm kernel oil.

According to another preferred embodiment of the present invention, the vinyl chloride resin nanocomposite is preferably in the form of a vinyl chloride resin is inserted between the layered silicate.

Referring to FIG. 2, in the vinyl chloride resin nanocomposite 20 using the layered silicate 22 according to the present invention, the layered silicate 22 is separated into nano-sizes and uniformly distributed in the vinyl chloride resin 24. Requires to do.

On the other hand, from the standpoint of the vinyl chloride resin 24, the molecular weight is very large, the molecular mobility is very low due to the entanglement between the polymer chains, and the size of the molecule is large, so that the minute size between the nanosheets of the layered silicate 22 is small. It is not easy to intercalate the molecular chain of the vinyl chloride resin 24 into the empty space. In addition, due to the strong van der Waals attraction between the silicate sheets, there is a significant increase in enthalpy if one wishes to increase the interlayer distance.

Therefore, the manufacturing technique of the vinyl chloride resin nanocomposite 20 in which the layered silicate 22 is uniformly dispersed is a problem depending on how effectively the laminated structure of the layered silicate 22 can be exfoliated in each nanosheet unit. to be.

 In the vinyl chloride resin nanocomposite according to the present invention, the layered silicate (22) is separated from the layered silicate in the matrix of the vinyl chloride resin (24) and the vinyl chloride resin (24) penetrates between the layered silicates (22). It may be uniformly present in (24).

According to a preferred embodiment of the present invention, the vinyl chloride resin nanocomposite is preferably in the form of a vinyl chloride resin is inserted between the layered silicate.

As such, when the layered silicate is peeled off and the vinyl chloride resin is inserted into the separated layered silicate, the mixture is uniformly mixed, resulting in improvement in flexural strength, impact strength, and thermal stability of the vinyl chloride resin nanocomposite.

The layered silicate used in the present invention preferably contains 0.5 to 10 parts by weight, and more preferably 1 to 6 parts by weight, based on 100 parts by weight of the vinyl chloride resin. When the content of the layered silicate is less than 0.5 parts by weight based on 100 parts by weight of the vinyl chloride resin, the vinyl chloride resin is not sufficiently mixed between the peeled layered silicates, and thus the bending strength and the impact strength of the vinyl chloride resin composite are not improved, which is undesirable. If it exceeds 10 parts by weight, the silicate is not uniformly mixed in the vinyl chloride resin matrix, and the silicates are agglomerated with each other, so that the bending strength and impact strength of the vinyl chloride resin composite are reduced, which is not preferable.

(C) talc

It is called talc and is a colorless or gray powder used as rubber, medicine, plating, insecticide, flame retardant, filler, etc., and has a molecular formula of Mg ₃ H ₂ (SiO ₃ ) ₄ . Hydrated magnesium silicate mineral with excellent whiteness. Pure talc has a hardness of 1 and the crystal has a hydrophobic plate-like structure.

According to a preferred embodiment of the present invention, the vinyl chloride resin nanocomposite may further include 1 to 15 parts by weight of talc based on 100 parts by weight of vinyl chloride resin, and more preferably 3 to 10 parts by weight of talc. It is good. When the talc is used in an amount less than 1 part by weight based on 100 parts by weight of the vinyl chloride resin, the thermal shock resistance, stiffness and workability of the vinyl chloride resin nanocomposite decrease, which is undesirable. It is not desirable because of its increased brittleness and reduced impact strength.

According to another aspect of the present invention, there is provided a piping material comprising the vinyl chloride resin nanocomposite.

Figure 3 is a process flow diagram schematically showing a method for producing a vinyl chloride resin nanocomposite according to the present invention. Referring to Figure 3, the vinyl chloride resin nanocomposite manufacturing method according to the present invention comprises the steps of preparing a vinyl chloride resin and a layered silicate (S10); And kneading the vinyl chloride resin and the layered silicate.

The method for producing a vinyl chloride resin nanocomposite according to the present invention first provides a vinyl chloride resin and a layered silicate (S10).

Here, the layered silicate used in the present invention may use montmorillonite, saponite or hectorite, but is not limited thereto. More preferably, montmorillonite is used. It is possible to use these substances alone or in admixture of two or more.

According to another preferred embodiment of the present invention, the montmorillonite is montmorillonite including interlaminar Na ⁺ , montmorillonite including interlaminar K ⁺ , montmorillonite containing interlaminar Ca ^{2 +} , interlayer represented by Formula 1 Montmorillonite containing organic matter or montmorillonite containing the organic material represented by Formula 2 may be used between layers. More preferably, montmorillonite containing Na ⁺ between layers may be used. It is possible to use these substances alone or in admixture of two or more.

The layered silicate used in the present invention preferably contains 0.5 to 10 parts by weight, and more preferably 1 to 6 parts by weight, based on 100 parts by weight of the vinyl chloride resin.

According to a preferred embodiment of the present invention, the vinyl chloride resin nanocomposite may further include 1 to 15 parts by weight of talc based on 100 parts by weight of vinyl chloride resin, and more preferably 3 to 10 parts by weight of talc. It is good.

After preparing the vinyl chloride resin and the layered silicate, the vinyl chloride resin and the layered silicate are kneaded (S20).

Referring to FIG. 4, in the step of kneading the vinyl chloride resin 44 and the layered silicate 42, the layered silicate 42 is peeled off and the vinyl chloride resin 44 is inserted between the peeled layered silicate 42. Vinyl chloride resin nanocomposites are formed. In this kneading step, the kneading temperature and the stirring speed become important factors.

The kneading step is preferably kneading at a temperature in the range of 175 to 195 ℃. If the kneading temperature is less than 175 ° C., the layered silicate and the vinyl chloride resin are not uniformly mixed, which is not preferable. If the temperature is higher than 195 ° C., thermal decomposition of the vinyl chloride resin occurs, which is not preferable.

In addition, the kneading step is preferably kneaded at a stirring speed in the range of 50 to 80rpm. If the stirring speed is less than 50rpm, the vinyl chloride resin and the layered silicate are not easily mixed, and if the stirring speed exceeds 80rpm, the high pressure is applied to the vinyl chloride resin and the molecular weight decrease of the vinyl chloride resin may occur. .

EXAMPLE

[ Example  1 to 3] Vinyl chloride resin  Preparation of Nanocomposites

A vinyl chloride resin having a weight average molecular weight of 79500 g / mol, Na ⁺ montmorillonite or organicized montmorillonite, and talc were manufactured by Toyoseki Co., Ltd. according to the mixing ratio according to Table 1 below. A vinyl chloride resin nanocomposite was prepared by kneading at 60 ° C. for 5 minutes at 190 ° C. using 655 laboplastomill.

[ Comparative example Hard Of vinyl chloride resin  Produce

The vinyl chloride resin and talc having a weight average molecular weight of 79500 g / mol were prepared according to the mixing ratio according to Table 1 below. A vinyl chloride resin was prepared by kneading at 60 rpm for 5 minutes at 190 ° C. through 655 laboplastomill.

The comparative example of Table 1 below is the composition ratio according to the conventional rigid PVC production, Examples 1 to 3 show the composition ratio blended to prepare a PVC nanocomposite for the present invention.

TABLE 1 Composition ratios of Examples 1 to 3 and Comparative Examples

ingredient Example 1 Example 2 Example 3 Comparative example PVC content (parts by weight) 100 100 100 100 Type of silicate Na ⁺ Montmorillonite Organized Montmorillonite 1 Organized Montmorillonite 2 - Silicate Content (parts by weight) 3.3 3.3 3.3 - Talc (part by weight) 3.3 3.3 3.3 3.3

Organized montmorillonite 1: Montmorillonite comprising an organic material of formula

Organized Montmorillonite 2: Interlaminar Montmorillonite Including Organics of Formula 4

[Formula 3]

Here, T is a C14-18 fatty acid.

[Formula 4]

Here, T is a C14-18 fatty acid.

end. [ Example  1 to 3] and Comparative Example The tensile strength , Flexural strength  And impact strength measurement

Tensile strength was measured according to ASTM D 638 at a specimen thickness of 2 mm and a measurement speed of 50 mm / min. Flexural strength was measured with a specimen of thickness 3mm, length 80mm, and width 10mm according to ASTM D 790. Impact strength was measured with a specimen of thickness 3mm in accordance with ASTM D 256.

TABLE 2 Tensile and flexural and impact strength test results of Examples 1 to 3 and Comparative Examples

division Tensile Strength (MPa) Flexural Strength (MPa) Izod impact strength (kgf-cm / cm) Example 1 61.2 163.9 5.85 Example 2 58.4 77.5 5.32 Example 3 58.5 75.0 4.20 Comparative example 59.2 70.9 5.20

As shown in Table 2, when Na ⁺ montmorillonite in the silicate was used, a PVC nanocomposite of high bending strength and impact strength could be obtained. This was the result of the best compatibility between PVC and Na ⁺ montmorillonite, and the PVC chain was intercalated into the silicate, so that the Na ⁺ montmorillonite in the silicate was well dispersed. In Examples 2 and 3, flexural strength was increased.

[ Example  1, 4] [ Na ⁺ According to montmorillonite content Vinyl chloride resin  Nanocomposite Manufacturing]

A vinyl chloride resin having a weight average molecular weight of 79500 g / mol, Na ⁺ montmorillonite and talc were prepared according to the mixing ratio according to Table 3 below. A vinyl chloride resin nanocomposite was prepared by kneading at 60 ° C. for 5 minutes at 190 ° C. using 655 laboplastomill.

 Table 3 Composition ratios of Examples 5 and 6

ingredient Example 1 Example 5 Vinyl chloride resin 100 100 Silicate (Na ⁺ Montmorillonite) 3.3 5.6 Talc 3.3 3.3

end. Preparation of Specimen for Measurement of Physical Properties

In order to measure the physical properties of the kneaded vinyl chloride resin nanocomposite using a mold having a thickness of 2mm at a temperature controlled to 190 ℃ hot preheating for 2 minutes using a mold of 2mm thick and pressurized at 4500psi for 1 minute To prepare a test piece for measuring the physical properties.

I. [ Example  1, 4] The tensile strength , Flexural strength  And impact strength measurement

Tensile strength, flexural strength and impact strength were measured in the same manner as in Examples 1 to 3.

Table 4 below shows the results of tensile, flexural and impact strength tests of PVC nanocomposites (Examples 1 and 4) and rigid PVC (comparative examples) according to the Na ⁺ montmorillonite content.

Table 4 Tensile, flexural and impact test results of Examples 1 and 4 and Comparative Examples

division Tensile Strength (MPa) Flexural Strength (MPa) Izod impact strength (kgf-cm / cm) Example 1 61.2 163.9 5.85 Example 4 52.5 141.3 5.27 Comparative example 59.2 70.9 5.20

As shown in Table 4, the PVC nanocomposite (Example 1) having a content of Na ⁺ montmorillonite of 3.3 parts by weight based on 100 parts by weight of vinyl chloride resin showed the best physical properties. In the case of the PVC nanocomposite (Example 4) having a content of 5.6 parts by weight of Na ⁺ montmorillonite with respect to 100 parts by weight of vinyl chloride resin (Example 4), since the silicate content is increased due to the increase in the silicate content in the PVC, the silicate is aggregated. Compared with the comparative example, it could be considered that the physical properties were decreased compared to the comparative example, and showed excellent flexural strength and impact strength.

All. X-ray X-ray diffraction (XRD) experiment

XRD experiments were conducted to determine the degree of dispersion of the nano-size silicates. 5 is a graph showing the X-ray diffraction (XRD) test results of Na ⁺ MMT montmorillonite, and FIG. 6 is an X-ray diffraction pattern of the vinyl chloride resin nanocomposite including Na ⁺ MMT montmorillonite according to an embodiment of the present invention. ) It is a graph of experiment result.

Referring to FIG. 5, the inherent peaks of Na ⁺ MMT stacked in layers were seen at 7.1 °, which is a 2θ value. Meanwhile, referring to FIG. 6, in the Na ⁺ MMT nanocomposite, the inherent peak of Na ⁺ MMT layered in layers was not seen at 7.1 °, which is a 2θ value. Therefore, it was thought that Na ⁺ MMT was peeled off and dispersed well in the PVC matrix. These XRD results were in good agreement with the results of tensile strength, flexural strength and impact strength.

7 is a graph showing the results of X-ray diffraction (XRD) experiments of the organic montmorillonite. The result graph.

Referring to FIG. 7, the inherent peaks of the layered organic MMT used in Example 2 were seen at 4.8 °, the value of 2θ. Meanwhile, referring to FIG. 6, in the organicized MMT nanocomposite, no peak was observed at 4.8 °, which is a 2θ value. Therefore, it was thought that the organicized MMT laminated in the lamellae layer in the PVC matrix was peeled off and well dispersed. These XRD results are in good agreement with the mechanical properties.

la. Thermogravimetric analysis thermogravimeric analysis , TGA )

In order to determine the thermal stability of the prepared vinyl chloride resin nanocomposites, the weight change of the vinyl chloride resin nanocomposites of Examples 1, 4 and Comparative Examples was measured by TGA.

9 is a graph showing the results of thermogravimetric analysis (TGA) of vinyl chloride resin nanocomposites and comparative examples of the vinyl chloride resin nanocomposites of Examples 1 and 4 of the present invention. Curve (a) is the TGA test result of the comparative example and curve (b) is the test result of Example 1. Referring to FIG. 9, pyrolysis of the vinyl chloride resin occurred at 40 ° C. lower than that of the vinyl chloride resin nanocomposite. Therefore, the thermal stability of the vinyl chloride nanocomposite was much better than that of the vinyl chloride resin.

 As described above, in the present invention, the vinyl chloride resin nanocomposite was prepared using the layered silicate, and in the case of the vinyl chloride resin nanocomposite according to the present invention, the tensile strength, the bending strength, and the impact strength were superior to those of the conventional hard vinyl chloride resin. And it was possible to provide a nanocomposite having excellent thermal stability and its manufacturing method.

The present invention is not limited to the above embodiments, and many variations are possible by those skilled in the art within the spirit of the present invention.

1 is a view showing a crystal structure of montmorillonite.

2 is a view showing a schematic structure of a vinyl chloride resin nanocomposite according to an embodiment of the present invention.

Figure 3 is a schematic manufacturing process of the vinyl chloride resin nanocomposite according to an embodiment of the present invention.

4 is a view schematically showing a structural change of the vinyl chloride resin nanocomposite component by the manufacturing process of the vinyl chloride resin nanocomposite according to an embodiment of the present invention.

Figure 5 is a graph of the X-ray diffraction (XRD) experimental results of Na ⁺ MMT montmorillonite.

Figure 6 is a graph of the X-ray diffraction (XRD) test results of the vinyl chloride resin nanocomposite containing Na ⁺ MMT montmorillonite according to an embodiment of the present invention.

Figure 7 is a graph of the X-ray diffraction (XRD) experimental results of the organic montmorillonite.

FIG. 8 is a graph showing X-ray diffraction (XRD) test results of a vinyl chloride resin nanocomposite including organicated montmorillonite according to an embodiment of the present invention.

9 is a graph showing the results of thermogravimetric analysis (TGA) of vinyl chloride resin nanocomposites according to an embodiment of the present invention and a vinyl chloride resin according to a comparative example.

<Explanation of symbols for the main parts of the drawings>

20 vinyl chloride resin nanocomposites

22 layered silicate

24 vinyl chloride resin

Claims (14)

Polyvinyl chloride (PVC); 0.5 to 10 parts by weight of layered silicate based on 100 parts by weight of the vinyl chloride resin; And 1 to 15 parts by weight of talc based on 100 parts by weight of the vinyl chloride resin Vinyl chloride nanocomposite comprising a. The method of claim 1, The layered silicate is one selected from the group consisting of montmorillonite, saponite, hectorite, and combinations thereof. The method of claim 2, The montmorillonite is montmorillonite containing Na ⁺ interlayer, montmorillonite containing K ⁺ interlayer, montmorillonite containing Ca ^{2 +} between layers, montmorillonite including the organic material represented by the following formula 1, interlayer The montmorillonite comprising an organic material represented by the following and the vinyl chloride resin nanocomposite is one selected from the group consisting of: [Formula 1]

R ¹ is an alkyl group having 12 to 36 carbon atoms, an alkenyl group having 12 to 36 carbon atoms, a saturated fatty acid having 12 to 36 carbon atoms, or an unsaturated fatty acid having 12 to 36 carbon atoms. [Formula 2]

R ² and R ³ are each independently an alkyl group having 12 to 36 carbon atoms, an alkenyl group having 12 to 36 carbon atoms, a saturated fatty acid having 12 to 36 carbon atoms, or an unsaturated fatty acid having 12 to 36 carbon atoms. The method of claim 1, The vinyl chloride resin nanocomposite is a vinyl chloride resin nanocomposite in the form of a vinyl chloride resin is inserted between the layered silicate. delete delete Pipe material containing the said vinyl chloride resin nanocomposite of any one of Claims 1-4. Preparing 0.5 to 10 parts by weight of the layered silicate with respect to the vinyl chloride resin and 100 parts by weight of the vinyl chloride resin; Preparing 1 to 15 parts by weight of talc based on 100 parts by weight of the vinyl chloride resin; And Kneading the vinyl chloride resin, the layered silicate and the talc; Method for producing a vinyl chloride resin nanocomposite comprising a. The method of claim 8, The layered silicate is montmorillonite (montmorillonite), saponite (saponite), hectorite (hectorite) and a method of producing a vinyl chloride resin nanocomposite is one selected from the group consisting of. The method of claim 9, The montmorillonite is montmorillonite containing Na ⁺ interlayer, montmorillonite including K ⁺ interlayer, montmorillonite containing Ca ^{2 +} between layers, montmorillonite containing the organic material represented by the formula (1) between layers, Formula 2 above Method for producing a vinyl chloride resin nanocomposite which is one selected from the group consisting of montmorillonite and a combination thereof containing an organic material of. delete delete The method of claim 8, The kneading step is to knead at a temperature in the range of 175 to 195 ° C. The method of claim 8, The kneading step is to knead at a stirring speed ranging from 50 to 80rpm.

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