KR101349588B1 - Polypropylene resin composition having improved melt strength and manufacturing method the same - Google Patents

Abstract

The present invention relates to a polypropylene resin composition having excellent melt tension and a method for producing the same, comprising: (a) 100 parts by weight of a polypropylene resin or a high melt strength polypropylene resin; (b) 0.1 to 20 parts by weight of the fluororesin; And (c) 0.1 to 20 parts by weight of an inorganic filler; discloses a polypropylene resin composition comprising the same and a method of manufacturing the same, by uniformly dispersing a fluorine resin in a polypropylene resin or a high melt strength polypropylene resin to improve melt tension In providing a polypropylene resin composition, the content of the fluorine resin to be dispersed and the content of the inorganic filler to be added are set to be optimal for improving the melt tension of the resin composition to be produced, and can be easily prepared by mixing and molding through an extruder. It is possible to provide a polypropylene resin composition and a method of manufacturing the same that can produce a polypropylene resin composition having excellent melt tension with an economical component composition with high production efficiency.

Description

Polypropylene resin composition excellent in melt tension and its manufacturing method {POLYPROPYLENE RESIN COMPOSITION HAVING IMPROVED MELT STRENGTH AND MANUFACTURING METHOD THE SAME}

The present invention relates to a polypropylene resin composition having excellent melt tension and a method for producing the same, and more particularly, to a polypropylene resin composition having an improved melt tension produced by an economical and simple method and a method for producing the same.

In general, polypropylene resins have excellent molding processability and chemical resistance, and are excellent in tensile strength, flexural strength, rigidity, and the like, and are applied to various applications such as injection and extrusion since they are relatively low in price and low in price. However, the polypropylene resin has a disadvantage that it is difficult to apply to various molding processes such as a large vacuum / pressure forming process, a foaming process, an extrusion coating molding process that requires a high melt tension due to low melt tension.

In order to improve the molding processability of such polypropylene resins, a method of mixing polypropylene with polyethylene is known. However, since a degree of improvement in molding processability is not satisfactory, a large amount of polyethylene is required, resulting in a decrease in strength of the resulting mixture. .

In addition, there are attempts to improve melt tension by increasing the molecular weight of polypropylene, but the high molecular weight has a problem in that melt fluidity, which is a variable in molding processability, is lowered and a proper balance between melt tension and melt fluidity cannot be maintained. .

On the other hand, since polytetrafluoroethylene has high crystallinity and low intermolecular attraction, it exhibits a fiber property that is adapted under a weak stress, and when blended with a thermoplastic resin, it has an improved molding processability and mechanical properties, and thus is an additive for thermoplastic resins. Has been used. However, polytetrafluoroethylene is insufficient in dispersibility when applied to a general-purpose thermoplastic resin containing non-halogen atoms, making it difficult to obtain uniform dispersion by simple mixing, and the surface appearance of the molded product is not good.

In order to improve the dispersibility of such polytetrafluoroethylene, Japanese Patent No. 2942888 mixes polytetrafluoroethylene particle aqueous acid solution and alkyl (meth) acrylate-based polymer particle aqueous acid solution, and solidifies or spray-drys the mixture. A method for producing a melt-tension improver for polyolefin resin by powdering is disclosed, but as disclosed, the method for dispersing polytetrafluoroethylene is very complicated and disadvantageous in terms of production cost and efficiency.

Also, Japanese Laid-Open Patent Publication No. 2000-198890 discloses a resin material for foam molding prepared by blending a polytetrafluoroethylene-based filler made of polytetrafluoroethylene and its dispersion modifier with a polyolefin-based resin. In terms of the action, only a styrene-based polymer and the like are used and the content thereof is limited to a wide range without a clear mention of the relationship with the melt tension of the resin produced.

In addition, Japanese Patent Application Laid-Open No. 11-29661 discloses an olefin-based composite resin composition comprising polytetrafluoroethylene and an inorganic filler in an olefin-based composite resin material, but a resin that is also produced in relation to the inorganic filler content. Without including a clear mention of the relationship between the melt tension of the excess of inorganic fillers, polytetrafluoroethylene dispersibility is not good, there is a problem that the durability, impact resistance, etc. of the molded article is reduced.

Accordingly, the present invention has been made to solve the above problems, in the production of a polypropylene resin composition having an improved melt tension, adopting an economical and effective optimum components and setting the content suitable for improving the melt tension of the resin composition, An object of the present invention is to provide a polypropylene resin composition and a method of manufacturing the same.

The present invention for solving the above problems, (a) 100 parts by weight of polypropylene resin or high melt strength polypropylene resin; (b) 0.1 to 20 parts by weight of the fluororesin; And (c) 0.1 to 20 parts by weight of the inorganic filler; provides a polypropylene resin composition comprising a.

In addition, the polypropylene resin provides a polypropylene-based resin composition, characterized in that the weight average molecular weight (Mw) is 300,000 or more, and the melt index (ASTM D1238) is a propylene homopolymer or copolymer having 0.1 to 10 g / 10 min.

In addition, the high melt strength polypropylene resin has a weight average molecular weight (Mw) of 300,000 or more, at least two polypropylene mixtures selected from the group consisting of homo polypropylene, block polypropylene and random polypropylene and the high melt strength poly It provides a polypropylene resin composition, characterized in that 0.1 to 2 parts by weight of the organic peroxide is mixed with respect to 100 parts by weight of the propylene resin.

In addition, the organic peroxide may be diisobutyl peroxide, t-amylperoxydicarbonate, di (4-t-butylcyclohexyl) peroxydicarbonate (di (4-tert- butylcyclohexyl) peroxydicarbonate, diethylhexyl peroxydicarbonate, dibutyl peroxydicarbonate, diisopropyl peroxydicarbonate, dicetyl peroxydicarbonate, diethyl peroxydicarbonate, Dimyristyl peroxydicarbonate, tert-butyl peroxypivalate, dilauuroyl peroxide, didecanoyl peroxide, 2,5-dimethyl- 2,5-di (2-ethylhexanoylperoxy) hexane (2,5-dimethyl-2,5-di (2-ethylhexanoylperoxy) hexane), 1,1,3,3-tetramethylbutylperoxy-2 Ethylhexanoate (1,1,3,3-tetramethylbutylperoxy-2-ethy lhexanoate), t-amylperoxy-2-ethylhexanoate, dibenzoyl peroxide, t-butylperoxy-2-ethylhexanoate (tert-butylperoxy 2-ethylhexanoate), tert-butylperoxy ethyl acetate, tert-butylperoxy isobutylate and 1,4-di (t-butylperoxycarbo) cyclohexane It provides a polypropylene resin composition characterized in that at least one member selected from the group consisting of (1,4-di (tert-butylperoxy carbo) cyclohexane).

In addition, the fluororesin is polytetrafluoroethylene (PTFE), tetrafluoroethylene-hexafluoropropylene copolymer (TFE-HFP), tetrafluoroethylene- perfluoroalkyl vinyl ether It provides a polypropylene resin composition, characterized in that at least one selected from the group consisting of a tetrafluoroethylene-perfluoroalkylvinylether copolymer (TFE-PVE) and polyvinylidene fluoride (PVDF).

In addition, the inorganic filler is at least one member selected from the group consisting of talc, clay, nano clay, calcium carbonate, wollastonite, calcium sulfate, magnesium oxide, calcium stearate, mica, calcium silicate and carbon black Provided is a polypropylene resin composition.

In addition, the polypropylene resin composition provides a polypropylene resin composition, characterized in that the melt tension (Rheotens 71.97) is 0.3N or more.

In order to solve the above another problem, the present invention, after mixing 100 parts by weight of polypropylene resin or high melt strength polypropylene resin, 0.1 to 20 parts by weight of fluorine resin and 0.1 to 20 parts by weight of inorganic filler in a mixer, and then added to the extruder and extruded It provides a method for producing a polypropylene resin composition.

In addition, the extruder is a twin screw extruder having a L / D of 32 or more, and provides a method for producing a polypropylene resin composition characterized in that the reaction temperature is carried out at 180 ~ 220 ℃.

The present invention provides a polypropylene resin composition with improved melt tension by uniformly dispersing a fluorine resin in a polypropylene resin or a high melt strength polypropylene resin, thereby preparing the content of the dispersed fluorine resin and the content of the inorganic filler to be added. It is set to be optimal for improving the melt tension of the resin composition to be prepared, and can be easily prepared by mixing and molding through an extruder, so that an economical component composition can produce a polypropylene resin composition having excellent melt tension with high production efficiency. It is possible to provide a polypropylene resin composition and a method for producing the same.

1 is a SEM photograph of the polypropylene resin composition according to Example 1,
2 is a SEM photograph of the polypropylene resin composition according to Example 2. FIG.

Hereinafter, the present invention will be described in detail with reference to preferred embodiments. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately 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 appended claims and their equivalents. It is to be understood that various equivalents and modifications may be substituted for those at the time of the present application.

The present invention (a) 100 parts by weight of polypropylene resin or high melt strength polypropylene resin; (b) 0.1 to 20 parts by weight of the fluororesin; And (c) 0.1 to 20 parts by weight of the inorganic filler; discloses a polypropylene resin composition comprising a.

The inventors of the present invention further added components and contents in the prior art in which polytetrafluoroethylene is mixed with a polyolefin resin to improve the melt tension of the polypropylene resin composition, and a component suitable for the melt tension of the resin composition to be produced. And the content is not clear, even if it has a good melt tension, it was noted that the manufacturing method is very complicated. Accordingly, when the specific components and the content ranges of the polypropylene resin are mixed as described above, the physical properties of the resin composition to be prepared are equal to or higher than the conventional ones, and show excellent melt tension. It became.

The polypropylene resin used in the present invention may be a high molecular weight polypropylene resin having a weight average molecular weight (Mw) of 300,000 or more, and preferably a high molecular weight polypropylene resin having 300,000 to 500,000, more preferably 300,000 to 400,000. have. When the weight average molecular weight is less than 300,000, dispersibility of the fluororesin may be reduced during mixing and extrusion.

In addition, the polypropylene resin preferably has a melt index (ASTM D1238) of 0.1 to 10 g / 10 min, more preferably 1 to 5 g / 10 min. If the melt index is less than 0.1g / 10min may reduce the moldability and productivity of the product, if the melt index exceeds 10g / 10min, the melt strength during the extrusion process is poor, the parison formation is not uniform, the failure rate may increase.

In the present invention, a high melt strength polypropylene resin is used together with or in place of the polypropylene resin. In the present invention, the high melt strength polypropylene resin is a resin having a strain hardening index (SHI) of a physical property value sufficient to obtain the effect of melt tension. Preferably has a property value of 60 or more.

As described above, the polypropylene resin may be used for various purposes because of its excellent physical properties such as tensile strength and flexural strength, but due to the linear structure of the polypropylene chain, the melt tension is rapidly decreased as temperature increases. In addition, the high melt strength polypropylene resin according to the present invention can be used to increase the melt tension by widening the molecular weight distribution after extrusion than when extruded only polypropylene alone or copolymer. Specifically, the high melt strength polypropylene resin according to the present invention has a weight average molecular weight (Mw) of 300,000 or more, preferably 300,000 to 400,000, more preferably 300,000 to 380,000, homo polypropylene, block polypropylene, and random polypropylene. Organic peroxide is added to at least two kinds of polypropylene mixtures selected from the group consisting of long side chain structures and crosslinked structures without degradation of the polypropylene to improve rigidity and wear resistance. As such, by mixing a high melt strength polypropylene resin having a higher rigidity and wear resistance than the conventional polypropylene resin alone or with the polypropylene resin, it is possible to improve the rigidity and wear resistance and to improve the workability during the extrusion process.

The high melt strength polypropylene resin preferably has a melt index of 0.1 to 10 g / 10 min, more preferably 1 to 3 g / 10 min. When the melt index is less than 0.1g / 10min, the gel is likely to be generated, and surface defects such as fish eye generation may occur, and when the melt index is greater than 10g / 10min, the long side chain structure is relatively weak when the organic peroxide is reacted to melt. Tension may be lowered.

In the present invention, the organic peroxide reacts with the high molecular weight polypropylene resin to form a long side chain structure, and in order to improve the melt tension of the resin composition to be produced, preferably, 100 parts by weight of the high melt strength polypropylene resin. 0.1 to 2 parts by weight, more preferably 0.5 to 1.5 parts by weight may be mixed.

Examples of the organic peroxide include diisobutyl peroxide, t-amylperoxydicarbonate, and di (4-t-butylcyclohexyl) peroxydicarbonate (di (4- tert-butylcyclohexyl) peroxydicarbonate, diethylhexyl peroxydicarbonate, dibutyl peroxydicarbonate, diisopropyl peroxydicarbonate, dicetyl peroxydicarbonate ), Dimyristyl peroxydicarbonate, tert-butyl peroxypivalate, dilauuroyl peroxide, didecanoyl peroxide, 2,5- Dimethyl-2,5-di (2-ethylhexanoylperoxy) hexane (2,5-dimethyl-2,5-di (2-ethylhexanoylperoxy) hexane), 1,1,3,3-tetramethylbutylperoxy 2-ethylhexanoate (1,1,3,3-tetramethylbutylperoxy -2-ethylhexanoate), t-amylperoxy-2-ethylhexanoate, dibenzoyl peroxide, t-butylperoxy-2-ethylhexanoate tert-butylperoxy-2-ethylhexanoate), tert-butylperoxy ethyl acetate, tert-butylperoxy isobutylate, 1,4-di (t-butylperoxycarbobo) ) Cyclohexane (1,4-di (tert-butylperoxy carbo) cyclohexane) etc. are mentioned.

In the present invention, the fluorine resin serves to increase the melt tension of the composition when mixed with a polypropylene resin or a high melt strength polypropylene resin, specifically, the fluorine resin used in the present invention is present in the form of spherical particles When mixed with the propylene resin or the high melt strength polypropylene resin and extruded, the fiber is deformed into a fiber by heat and shear force, thereby increasing the melt tension of the resin composition.

The optimum content of the fluorine resin to be mixed for the increase in the melt tension action is, considering the dispersibility in the polypropylene resin or the high melt strength polypropylene resin and the content of the inorganic filler added together, the polypropylene resin or the high melt strength polypropylene It was confirmed that the range of 0.1 to 20 parts by weight relative to 100 parts by weight of resin, preferably 1 to 15 parts by weight, more preferably 3 to 10 parts by weight, and more economically, 3 to 5 parts by weight Most preferably included.

Examples of the fluororesin include polytetrafluoroethylene (PTFE), tetrafluoroethylene-hexafluoropropylene copolymer (TFE-HFP), and tetrafluoroethylene-perfluoroalkyl. A vinyl ether copolymer (tetrafluoroethylene-perfluoroalkylvinylether copolymer (TFE-PVE), polyvinylidene fluoride (PVDF), etc.) may be used, and preferably polytetrafluoroethylene may be used. In addition, the fluorine resin may be mixed in the form of spherical particles to the polypropylene resin or high melt strength polypropylene resin. Such fluorine resin particles may be used particles of 0.01 ~ 10㎛ size and particles of 0.05 ~ 2㎛ size may be used to improve the dispersibility in the resin composition.

In the present invention, the inorganic filler is mixed with the propylene resin or the polypropylene resin or high melt strength polypropylene resin to impart a synergistic effect to the improvement of the melt tension of the resin composition produced during extrusion molding, surprisingly a range of content It was confirmed that the effect of improving the melt tension of the resin composition was remarkable.

Therefore, the inorganic filler is included 0.1 to 20 parts by weight when the fluororesin is contained in an amount of 0.1 to 20 parts by weight based on 100 parts by weight of the polypropylene resin or the high melt strength polypropylene resin. That is, based on the content of the polypropylene resin or the high melt strength polypropylene resin and the fluorine resin, the improvement in the melt tension of the resin composition prepared by mixing and extruding them is the most remarkable content of the inorganic filler. When the content exceeds 20 parts by weight, the melt tension of the resin composition to be produced may increase slightly, but the degree is only insignificant compared to the excess content. However, when the content is less than 0.1 parts by weight may not appear to improve the melt tension of the resin composition to be produced. The preferred range relative to the content is 1 to 15 parts by weight, more preferably 3 to 10 parts by weight, and most preferably 5 to 10 parts by weight.

Examples of the inorganic filler include talc, clay, nano clay, calcium carbonate, wollastonite, calcium sulfate, magnesium oxide, calcium stearate, mica, calcium silicate, carbon black, and the like, and preferably talc, Clay, nano clay can be used. Such inorganic fillers may be used having an average particle diameter of 1 ~ 30㎛, preferably 5 ~ 10㎛ may be used. When the average particle diameter is less than 1 μm, heat resistance and rigidity reinforcing effects may not be sufficiently exhibited, and when the average particle diameter exceeds 30 μm, handling and operation may not be easy during extrusion of the resin composition.

The shape of the polypropylene resin composition according to the present invention may include, for example, strand, sheet, flat plate, pellet, or the like, and the pellet may be added with various additives depending on the purpose. Examples of the additive include a modification additive, a coloring agent, and the like, and the modification additive includes a dispersant, a lubricant, a plasticizer, a flame retardant, an antioxidant, an antistatic agent, a light stabilizer, and an ultraviolet absorber. Such additives may be added when producing pellets from the polypropylene-based resin composition, and may be added when forming a molded article after pellet molding.

The above-described polypropylene resin composition according to the present invention provides a polypropylene resin composition having an excellent melt tension of 0.3 N or more (measured using Rheotens 71.97), thereby providing vacuum formability, blow moldability, and foam molding. Processability, such as castability, calender formability, etc. is improved and can be widely used in the production of various consumer goods.

The polypropylene resin composition according to the present invention can be produced simply using a known method. Accordingly, the present invention is a polypropylene resin composition by mixing 100 parts by weight of polypropylene resin or high melt strength polypropylene resin, 0.1 to 20 parts by weight of fluorine resin and 0.1 to 20 parts by weight of inorganic filler in a mixer and then extruded and extruded into an extruder. Disclosed is a method of preparing the same.

In the present invention, an internal mixer and an extruder may be used as the mixing and extrusion equipment, and in the case of the extruder, a twin screw extruder having an L / D of 32 or more may be used. At this time, the extruder may be injected into the side by using additives such as one or more side feeder (side feeder) capable of side input, in the present invention, at least polypropylene resin or high melt strength polypropylene resin, fluorine resin and inorganic Even when the filler is mixed at the same time and introduced into the main feeder, it is possible to produce a polypropylene resin composition having excellent melt tension. On the other hand, the reaction temperature of the extruder is preferably carried out at 180 ~ 220 ℃, more preferably carried out at 190 ~ 210 ℃.

The molded article produced using the polypropylene resin composition according to the present invention is injection molding, compression molding, injection compression molding, gas injection injection molding, foam injection molding, inflation method, T die method, calender method, It can be produced by a method such as blow molding, vacuum molding, pressure molding.

When the molded article according to the present invention is a film or a sheet, it can be molded by laminating it into at least one layer of a multilayer structure with other resins by an inflation method, a T-die method, a calendar method, or the like. In addition, the molded film or sheet can be uniaxially or biaxially extended by a roll extension method, a tender extension method, a tubular extension method, or the like.

Moreover, the molded object which concerns on this invention can also be used by adding surface treatment, such as a corona discharge treatment, a flame treatment, a plasma treatment, and ozone treatment.

Hereinafter, the present invention will be described in more detail with reference to specific examples and comparative examples.

Example  One

Reaction temperature of 200 ° C by simultaneously adding and mixing 100 parts by weight of polypropylene resin (weight average molecular weight 350,000) and 3 parts by weight of polytetrafluoroethylene to the main feeder using a twin screw extruder having an L / D of 40 Extruded at to prepare a polypropylene resin composition.

Example  2

A polypropylene resin composition was prepared in the same manner as in Example 1, except that 5 parts by weight of talc in Example 1 was further added simultaneously with the components.

Example  3

Instead of the polypropylene resin in Example 1 was added a high melt strength polypropylene resin (100 parts by weight of a mixture of homopolypropylene and block polypropylene mixed with 1 part by weight of diisobutyl peroxide, weight average molecular weight 350,000) Except for producing a polypropylene resin composition in the same manner as in Example 1.

Example  4

A polypropylene resin composition was prepared in the same manner as in Example 3, except that 5 parts by weight of talc in Example 3 was further added simultaneously with the components.

Example  5

50 parts by weight of the polypropylene resin and 50 parts by weight of the high melt strength polypropylene resin (100 parts by weight of a mixture of homopolypropylene and block polypropylene mixed with 1 part by weight of diisobutyl peroxide, weight average molecular weight 350,000) in Example 1 A polypropylene resin composition was prepared in the same manner as in Example 1, except that parts were added.

Example  6

A polypropylene resin composition was prepared in the same manner as in Example 5, except that 5 parts by weight of talc in Example 5 was further added simultaneously with the components.

Comparative Example  One

A polypropylene resin composition was prepared in the same manner as in Example 1, except that polytetrafluoroethylene was not added in Example 1.

Comparative Example  2

A polypropylene resin composition was prepared in the same manner as in Example 3, except that polytetrafluoroethylene was not added in Example 3.

Comparative Example  3

A polypropylene resin composition was manufactured in the same manner as in Example 5, except that polytetrafluoroethylene was not added in Example 5.

The components and compositions according to the Examples and Comparative Examples are summarized in Table 1 below.

division Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Comparative Example 1 Comparative Example 2 Comparative Example 3 Polypropylene (parts by weight) 100 100 - - 50 50 100 - 50 High melt strength polypropylene (parts by weight) - - 100 100 50 50 - 100 50 Polytetrafluoroethylene (parts by weight) 3 3 3 3 3 3 - - - Talc (part by weight) - 5 - 5 - 5 - - -

The physical properties of the polypropylene resin composition according to the Examples and Comparative Examples were evaluated as follows, and the measurement results are shown in Table 2 below.

[Property evaluation]

(1) Melt index

It measured by ASTM D1238 method at 230 degreeC and 2.16 kgf.

(2) melt tension

Measurements were made using a Rheotens 71.97 instrument (Gottfert, Germany). The measuring method was measured by inserting a resin in a Brabender single screw extruder (Bravender, Germany), extruded at 200 ℃, 50rpm and equipped with a Rheotens under the die. Rheotens is equipped with four wheels for stretching the resin, and the stretching speed is accelerated at the same rate (0.1 s ^-1 ).

(3) Yield point stress and flexural strength

It measured by ASTM D638 method and ASTM D790 method using the Instorn 4466 instrument (Instron company).

division Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Comparative Example 1 Comparative Example 2 Comparative Example 3 The melt index (g / 10 min) 0.7 0.6 2.1 1.8 1.3 1.2 1.0 2.9 2.0 Melt Tension (N) 0.28 0.70 0.36 0.90 0.31 0.76 0.12 0.26 0.17 Yield point stress (㎏f / ㎠) 421 423 410 405 413 415 395 402 400 Flexural Strength (㎏f / ㎠) 510 529 545 560 528 540 464 547 497

As shown in Table 2, a fluororesin is mixed with a polypropylene resin or a high melting polypropylene resin (Examples 1, 3, and 5), or an inorganic filler is mixed with the fluorine resin (Examples 2, 4, and 6). In the case of the polypropylene-based resin composition prepared in the above, the melt tension is maintained while maintaining the physical properties equal to or higher than those of the polypropylene-based resin composition prepared without mixing fluororesin or inorganic filler (Comparative Examples 1 to 3). It can be seen that the improvement is about 2 to 6 times. In addition, when comparing the case of Examples 1 and 3, Examples 2 and 4, it can be seen that when the high melt strength polypropylene resin is used instead of the polypropylene resin, the melt tension is improved by approximately 1.5 times.

In particular, when comparing Examples 1 and 2, Examples 3 and 4, and Examples 5 and 6, it can be seen that the melt tension is improved by about 2.5 times compared to the case where it is not mixed with an appropriate amount of inorganic filler. have. As such, the polypropylene-based resin composition prepared by further mixing an appropriate amount of an inorganic filler according to the present invention, as can be seen in Figure 2, the amount of fluorine resin that is transformed into a fiber form during the extrusion process in the polypropylene resin substrate It maximizes the melt tension.

Therefore, the polypropylene resin composition according to the present invention is prepared by mixing and extruding an optimal content of fluorine resin and an inorganic filler in a polypropylene resin or a high melt strength polypropylene resin, thereby having a dramatically improved melt tension through a simple method. It can be confirmed that the polypropylene resin composition is provided.

Claims (9)

(a) 100 parts by weight of a high melt strength polypropylene resin alone or a mixture of the high melt strength polypropylene resin and polypropylene resin having a strain hardening index (SHI) of 30 or more;
(b) 0.1 to 20 parts by weight of the fluororesin; And
(c) 0.1 to 20 parts by weight of the inorganic filler;
Polypropylene-based resin composition comprising a. The method of claim 1,
The polypropylene resin is a polypropylene-based resin composition, characterized in that the weight average molecular weight (Mw) is 300,000 or more, the melt index (ASTM D1238) is a propylene homopolymer or copolymer of 0.1 ~ 10g / 10min. The method of claim 1,
The high melt strength polypropylene resin has a weight average molecular weight (Mw) of 300,000 or more, a mixture of two or more polypropylenes selected from the group consisting of homo polypropylene, block polypropylene and random polypropylene and the high melt strength polypropylene resin 0.1-2 weight part of organic peroxides are mixed with respect to 100 weight part, The polypropylene resin composition characterized by the above-mentioned. The method of claim 3,
The organic peroxide is diisobutyl peroxide, t-amylperoxydicarbonate, di (4-t-butylcyclohexyl) peroxydicarbonate (di (4-tert-butylcyclohexyl) peroxydicarbonate, diethylhexyl peroxydicarbonate, dibutyl peroxydicarbonate, dibutyl peroxydicarbonate, diisopropyl peroxydicarbonate, dicetyl peroxydicarbonate, dimyri Dimyristyl peroxydicarbonate, tert-butyl peroxypivalate, dilauuroyl peroxide, didecanoyl peroxide, 2,5-dimethyl-2, 5-di (2-ethylhexanoylperoxy) hexane (2,5-dimethyl-2,5-di (2-ethylhexanoylperoxy) hexane), 1,1,3,3-tetramethylbutylperoxy-2-ethyl Hexanoate (1,1,3,3-tetramethylbutylperoxy-2-ethylhexanoa te), t-amylperoxy-2-ethylhexanoate (tert-amylperoxy-2-ethylhexanoate), dibenzoyl peroxide, t-butylperoxy-2-ethylhexanoate (tert-butylperoxy 2-ethylhexanoate), tert-butylperoxy ethyl acetate, tert-butylperoxy isobutylate and 1,4-di (t-butylperoxycarbo) cyclohexane (1,4-di (tert-butylperoxy carbo) cyclohexane) is a polypropylene resin composition, characterized in that at least one member selected from the group consisting of. The method of claim 1,
The fluororesin is polytetrafluoroethylene (PTFE), tetrafluoroethylene-hexafluoropropylene copolymer (TFE-HFP), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (tetrafluoroethylene-perfluoroalkylvinylether copolymer; TFE-PVE) and polyvinylidene fluoride (polyvinylidene fluoride; PVDF) polypropylene resin composition, characterized in that at least one member selected from the group consisting of. The method of claim 1,
The inorganic filler is polypropylene, characterized in that at least one selected from the group consisting of talc, clay, nano clay, calcium carbonate, wollastonite, calcium sulfate, magnesium oxide, calcium stearate, mica, calcium silicate and carbon black System resin composition. 7. The method according to any one of claims 1 to 6,
The polypropylene resin composition is a polypropylene resin composition characterized in that the melt tension (Rheotens 71.97) is 0.3N or more. High tensile strength polypropylene resin having a strain hardening index (SHI) of 30 or more, or 100 parts by weight of a mixture of the high melt strength polypropylene resin and polypropylene resin, 0.1 to 20 parts by weight of fluorine resin, and 0.1 to inorganic filler After mixing 20 parts by weight in a mixer, it is put into an extruder and extruded to produce a polypropylene resin composition. 9. The method of claim 8,
The extruder is a twin screw extruder having a L / D of 32 or more, the method for producing a polypropylene resin composition, characterized in that carried out at a reaction temperature of 180 ~ 220 ℃.

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