KR20140146797A - Polypropylene resin composition for loose tube having excellent rigidity, manufacturing method thereof, loose tube manufactured from the composition and optical cable comprising the same - Google Patents

Abstract

The present invention relates to a polypropylene resin composition for a loose tube having excellent rigidity and flexibility, which contains 1-20 wt% of inorganic filler having an aspect ratio of 50 or greater and more preferably contains 1-20 wt% of magnesium hydroxide, 0.1-10 wt% of modified propylene, 1-10 wt% of thermoplastic elastic body and remaining amount of polypropylene, has hardness of the level of protecting an optical cable of a loose tube type manufactured by using the same from an external shock, and has excellent flexibility to make installation and maintenance work easy, to a method for manufacturing the same, a loose tube manufactured with the same, and an optical cable comprising the same.

Description

TECHNICAL FIELD [0001] The present invention relates to a polypropylene resin composition for a rouge tube excellent in rigidity and flexibility, a method for producing the same, a rouge tube made of the composition, and an optical fiber including the same. BACKGROUND ART AND OPTICAL CABLE COMPRISING THE SAME}

The present invention relates to a polypropylene resin composition for a rouge tube excellent in rigidity and flexibility, a method for producing the same, a rouge tube made of the composition, and an optical cable including the same. More particularly, the present invention relates to an inorganic filler having an aspect ratio of 50 or more, Wherein the fiber optic cable comprises 1 to 20% by weight of a hydroxide, 0.1 to 10% by weight of a modified polypropylene, 1 to 10% by weight of a thermoplastic elastomer and polypropylene as a residual amount, A polypropylene resin composition for a rouge tube excellent in rigidity and flexibility, which has a strength enough to be able to be protected and has excellent flexibility to facilitate installation and maintenance work, a method for producing the same, a rouge Tubes and optical cables containing them Will.

Optical cable is capable of transmitting a large amount of information to a long distance at a long time, and is composed of an optical fiber bundle and an envelope covering the optical fiber bundle.

In order to protect the optical fiber from external environment or external impact such as temperature change, compression, twist, etc., the material of the conventional loose tube type optical cable is polybutylene terephthalate (PBT) (Korean Unexamined Patent Application Publication No. 1999-0070363) Engineering plastics such as carbonates (PC) (Korean Unexamined Patent Publication No. 2005-0064807) and polyamides have been used because engineering plastics have excellent bending strength and flexibility, And the degree of shrinkage and expansion according to the above-described method is low. However, engineering plastics are not easy to process, are expensive, and have a disadvantage in that their physical properties are changed by moisture.

On the other hand, to overcome the disadvantages of engineering plastics used as rouge tube type optical cable materials, we started to use polypropylene. Polypropylene has little change in physical properties due to moisture, and has a lower specific gravity than other engineering plastics, so that the weight of the entire product is lowered, which leads to light weight of the optical cable. However, the polypropylene has a lower cooling rate than that of the conventional polybutylene terephthalate, so that the shrinkage occurs even after the tube is worked, thereby deteriorating the transmission characteristics of the optical fiber. Techniques using polypropylene containing a nucleating agent have been applied to lower this post-shrinkage. However, polypropylene containing polypropylene alone or a nucleating agent has a flexural modulus of 18000 kgf / cm 2 or less, which is significantly lower than that of conventional polybutylene terephthalate. Therefore, it has a disadvantage that it can not withstand external pressures acting on a routed tube- The shape of the tubular optical cable can not be maintained.

DISCLOSURE OF THE INVENTION The inventors of the present invention have continuously studied to solve the above-mentioned problems of the prior art and found that a polypropylene resin composition obtained by combining an inorganic filler having an aspect ratio of 50 or more, a modified polypropylene, a thermoplastic elastomer and polypropylene, It is possible to manufacture a routed tube type optical cable having excellent flexural modulus and tensile elongation, and completed the present invention.

Accordingly, an object of the present invention is to provide a polypropylene resin composition for a rouge tube excellent in rigidity and flexibility.

Another object of the present invention is to provide a method for producing a polypropylene resin composition for a rouge tube excellent in rigidity and flexibility.

It is still another object of the present invention to provide a rouge tube made of a polypropylene resin composition for a rouge tube excellent in rigidity and flexibility.

Another object of the present invention is to provide an optical cable including the loose tube.

The above and other objects of the present invention can be achieved by the present invention described below.

In order to achieve the above object, the polypropylene resin composition for a rouge tube excellent in rigidity and flexibility according to the present invention comprises 1 to 20% by weight of an inorganic filler having an aspect ratio of 50 or more, 0.1 to 10% by weight of a modified polypropylene, 1 to 10% by weight of a thermoplastic elastomer, And polypropylene as a remaining amount.

The inorganic filler may preferably be magnesium hydroxide.

The inorganic filler may be a plate having a length of at least 3.5 mu m and a thickness of at most 70 nm.

The modified polypropylene may further comprise at least one reactor selected from the group consisting of an acrylic acid group, a maleic acid group, a maleic anhydride group, a carboxylic acid group, and a hydroxyl group at the end of the polypropylene main chain or at least two reactors .

The thermoplastic elastomer may be selected from the group consisting of an olefin-based copolymer, an alpha-olefin-based copolymer, an aromatic vinyl-based copolymer, and a mixture of two or more thereof.

The thermoplastic elastomer is preferably an ethylene-butene copolymer or a derivative thereof, an ethylene-octene copolymer or a derivative thereof, an ethylene-propylene copolymer or a derivative thereof, an aromatic vinyl monomer and an aliphatic unsaturated hydrocarbon having 2 to 10 carbon atoms Copolymers, and mixtures of two or more thereof.

The copolymer of the aromatic vinyl monomer and the aliphatic unsaturated hydrocarbon having 2 to 10 carbon atoms may be a styrene-butadiene-styrene copolymer, a styrene-isoprene-styrene copolymer, a styrene-ethylene-propylene-styrene copolymer, a styrene- Styrene copolymers, and mixtures of two or more thereof.

The polypropylene may be a propylene homopolymer; Block copolymers of propylene and alpha-olefins; Random copolymers of propylene and alpha-olefins; Terpolymers of propylene, ethylene and alpha-olefins; And a mixture of two or more thereof.

The polypropylene may have a flow index of 0.3 to 3 g / 10 min (at 230 [deg.] C with a load of 2.16 kg).

The resin composition is selected from the group consisting of a lubricant, an antioxidant, a light stabilizer, a releasing agent, a pigment, an antistatic agent, a crosslinking agent, an antibacterial agent, a processing aid, a metal deactivator, a friction agent, a wear- And may further include additives.

A process for producing a polypropylene resin composition for a rouge tube excellent in rigidity and flexibility according to the present invention is characterized by comprising 1 to 20% by weight of an inorganic filler having an aspect ratio of 50 or more, 0.1 to 10% by weight of a modified polypropylene, 1 to 10% by weight of a thermoplastic elastomer, And a mixing step of mixing and kneading the polypropylene.

According to the present invention, there is provided a polypropylene resin composition for a loose tube excellent in rigidity and flexibility by combining an inorganic filler, an modified polypropylene and a thermoplastic elastomer with an aspect ratio of 50 or more in polypropylene as a base resin, The present invention relates to a rouge tube excellent in rigidity and flexibility, which has a strength enough to protect an optical cable from an external impact, and has excellent flexibility for facilitating installation and maintenance work, and an optical cable including the same It is possible.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing one embodiment of an optical cable including a rouge tube made of a polypropylene resin composition for a rouge tube excellent in rigidity and flexibility according to the present invention. Fig.

The polypropylene resin composition for a rouge tube excellent in rigidity and flexibility according to the present invention comprises 1 to 20 wt% of an inorganic filler having an aspect ratio of 50 or more, 0.1 to 10 wt% of a modified polypropylene, 1 to 10 wt% of a thermoplastic elastomer, . That is, by mixing the inorganic filler having an aspect ratio of 50 or more with polypropylene as the base resin to improve the flexural modulus, and by improving the flexibility by mixing the modified polypropylene and the thermoplastic elastomer, The present invention provides a polypropylene resin composition which achieves the object of the present invention as described above.

The inorganic filler may have an aspect ratio of 50 to 500, 50 to 100, or 50 to 80, for example. Within this range, the inorganic filler has an excellent flexural modulus.

The structure of the rouge tube made of the polypropylene resin composition for rouge tube suitable for the manufacture of the above-mentioned rouge tube and the structure of the rouge tube type optical cable 10 including the rouge tube is, for example, as shown in Fig. 1, A structure including a line 11 and a plurality of loose tube optical fiber units 12 adjacent thereto, a reinforcing member 17 surrounding the loose tube optical fiber unit 12, and a sheath 18 surrounding the reinforcing member 17. [ . In particular, the loose tube optical fiber unit 12 is provided with an optical fiber 13, a loose tube 14 surrounding the optical fiber 13, and a space between the optical fiber 13 and the loose tube 14, A cushioning material 15 such as jelly that protects the optical fiber 13 is filled. In addition, waterproof yarn or talc powder can be filled in addition to the conventional jelly, thereby ensuring convenience in workability. The optical cable 10 may further include a plurality of loose tube optical fiber units 13 as described above, as well as a circular aperture 16 having a circular cross section for holding the optical cable in a circular shape.

The inorganic filler, preferably magnesium hydroxide, may be a plate having a long side of 3.5 m or more and a thickness of 70 nm or less. The magnesium hydroxide has a function of improving the flexural modulus of the polypropylene resin composition according to the present invention and can be dispersed in the polypropylene as the base resin to achieve its object. A general inorganic filler such as magnesium hydroxide having an aspect ratio of less than 50 or talc having an aspect ratio of less than 50 can not achieve a sufficient flexural modulus improvement. The magnesium hydroxide is used in an amount of 1 to 20% by weight, preferably 3 to 17% by weight, and most preferably 5 to 15% by weight, based on the total weight of the resin composition according to the present invention, , And when it exceeds 20% by weight, the tensile elongation may be lowered.

The modified polypropylene may further comprise at least one reactor selected from the group consisting of an acrylic acid group, a maleic acid group, a maleic anhydride group, a carboxylic acid group, and a hydroxyl group at the end of the polypropylene main chain or at least two reactors , Preferably the terminal group may consist of a maleic acid group. The modified polypropylene has a function of improving the dispersibility of the magnesium hydroxide in the resin composition according to the present invention and is characterized in that the surface of the magnesium hydroxide, the surface of the polypropylene as the base resin and the surface of the thermoplastic elastomer So that the magnesium hydroxide can be uniformly dispersed in the resin composition according to the present invention. By adding the modified polypropylene, it is possible to achieve complete dispersion of the resin composition according to the present invention, thereby improving the flexural modulus and tensile elongation of the resin composition according to the present invention. It is preferable that the modified polypropylene is used within a range of 0.1 to 10% by weight, preferably 0.3 to 8% by weight, and most preferably 3 to 6% by weight based on the total weight of the resin composition according to the present invention. So as to improve the flexural modulus and tensile elongation.

The thermoplastic elastomer functions to improve the tensile elongation of the resin composition according to the present invention, and is selected from the group consisting of an olefin-based copolymer, an alpha-olefin-based copolymer, an aromatic vinyl-based copolymer and a mixture of two or more thereof Can be. The thermoplastic elastomer is preferably an ethylene-butene copolymer or a derivative thereof, an ethylene-octene copolymer or a derivative thereof, an ethylene-propylene copolymer or a derivative thereof, an aromatic vinyl monomer and an aliphatic unsaturated hydrocarbon having 2 to 10 carbon atoms Copolymers, and mixtures of two or more thereof. The copolymer of the aromatic vinyl monomer and the aliphatic unsaturated hydrocarbon having 2 to 10 carbon atoms is preferably a styrene-butadiene-styrene copolymer, a styrene-isoprene-styrene copolymer, a styrene-ethylene-propylene-styrene copolymer, Butylene-styrene copolymer, and a mixture of two or more thereof. The alpha-olefin-based copolymer or the olefin-based copolymer may have a partially crystalline structure or a random copolymer prepared by copolymerizing two or more monoolefins as amorphous. As the olefin-based copolymer, an ethylene-octene copolymer mainly copolymerized with ethylene and octene, an ethylene-butene copolymer mainly copolymerized with ethylene and butene, or an ethylene-propylene copolymer mainly copolymerized with ethylene and propylene is used . The thermoplastic elastomer is used in an amount of 1 to 10% by weight, preferably 2 to 8% by weight, and most preferably 3 to 7% by weight, based on the total weight of the resin composition according to the present invention, And to improve the flexural modulus. When the content of the thermoplastic elastomer is more than 10% by weight, the flexural modulus of the resin composition according to the present invention is lowered, and thus the loose tube manufactured using the resin composition may be difficult to maintain its shape against external pressure.

The polypropylene serves as a base resin of the resin composition according to the present invention, and is a propylene homopolymer; Block copolymers of propylene and alpha-olefins; Random copolymers of propylene and alpha-olefins; Terpolymers of propylene, ethylene and alpha-olefins; And a mixture of two or more thereof. Examples of the alpha-olefin monomers constituting the polypropylene include ethylene, 1-butene, 1-pentene, 1-hexene and mixtures of two or more thereof May be used. The polypropylene is used as a residual amount excluding the above-mentioned other components based on the total weight of the resin composition according to the present invention and is used as a base resin of the resin composition according to the present invention, If the amount occupied by the total weight of the resin composition is too small, there may be a problem that the flexural modulus of the resulting resin composition is lowered. On the other hand, if too much, the tensile elongation may be lowered. The polypropylene preferably has a flow index of 0.3 to 3 g / 10 min (at 230 ° C. under a load of 2.16 kg), preferably 1 to 2.5 g / 10 min (at 230 ° C. under a load of 2.16 kg) 10 min (at 230 占 폚 under a load of 2.16 kg). When the flow index is out of the range of 0.3 to 10 g / 10 min (at 230 캜 under a load of 2.16 kg), the fluidity of the resin composition according to the present invention becomes too low or too high, This can be.

The resin composition is selected from the group consisting of a lubricant, an antioxidant, a light stabilizer, a releasing agent, a pigment, an antistatic agent, a crosslinking agent, an antibacterial agent, a processing aid, a metal deactivator, a friction agent, a wear- And may further include additives. The additive can be added within a range that does not impair the physical properties of the resin composition obtained according to the present invention and can impart physical properties of other resin compositions depending on the properties of the additive. It will be understood that the decision of the present invention can be appropriately used by those skilled in the art by purchasing commercially available products from leading domestic and foreign manufacturers and following the instructions of the manufacturers.

The method for producing a polypropylene resin composition for a rouge tube excellent in rigidity and flexibility according to the present invention comprises 1 to 20% by weight of magnesium hydroxide having an aspect ratio of 50 or more, 0.1 to 10% by weight of a modified polypropylene, 1 to 10% by weight of a thermoplastic elastomer, And a mixing step of mixing and kneading the polypropylene as the remaining amount. The polypropylene resin composition for a rouge tube excellent in rigidity and flexibility according to the present invention is obtained by first mixing the above components and additives in a mixer and then extruding the mixture in an extruder, preferably a twin-screw extruder, melting and kneading using one of various compounding machines such as single-screw extruder, roll-mills, kneader or banbury mixer, and the like.

The polypropylene resin composition for a rouge tube excellent in rigidity and flexibility according to the present invention according to the present invention can be subsequently processed into a pelletizer to obtain pellets, Lt; / RTI > tube.

Further, according to the present invention, an optical cable including the rouge tube obtained as described above can be manufactured.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the scope and spirit of the invention as disclosed in the accompanying claims. Changes and modifications may fall within the scope of the appended claims.

[Example]

[Example 1]

87% by weight of polypropylene having a flow index of 2 g / 10 min as a base resin (trade name: Moplen HP522H, trade name; available from Polymira Co., Ltd., Korea; flexural modulus of 15,500 kg / cm2), aspect ratio 64 (plate- 5% by weight of magnesium hydroxide (manufactured by Kyowa Chemical Industry Co., Ltd., Japan), 5% by weight of a modified polypropylene having a maleic acid group content of 1.0% by weight, a thermoplastic elastomer 3% by weight of an octene copolymer elastomer (trade name: LC170, manufactured by LG Chemical Co., Ltd., Korea) was melted and kneaded in a twin-screw extruder and then molded into pellets. A polypropylene resin composition for a rouge tube excellent in rigidity and flexibility was obtained.

 [Example 2]

Except that 73 wt% of polypropylene, 15 wt% of magnesium hydroxide, 5 wt% of modified polypropylene, and 7 wt% of thermoplastic elastomer were used.

[Comparative Example 1]

Except that 5 wt% of a plate-shaped talc having an average particle size of 5.5 mu m (Koch Korea Co., Ltd., product name: KCM-6300) was used instead of the above magnesium hydroxide having an aspect ratio of 64 Respectively.

[Comparative Example 2]

The procedure of Example 1 was repeated except that the modified polypropylene was not used.

[Comparative Example 3]

The procedure of Example 1 was repeated except that the thermoplastic elastomer component was not used.

[Comparative Example 4]

The procedure of Example 1 was repeated, except that 60 wt% of the polypropylene, 15 wt% of the magnesium hydroxide, 10 wt% of the modified polypropylene and 15 wt% of the thermoplastic elastomer were used .

[Test Example]

In order to test the physical properties of the pelletized polypropylene resin compositions prepared in Examples 1 to 2 and Comparative Examples 1 to 4, test pieces for measuring the physical properties were manufactured using an injection molding machine, and the flexural modulus, tensile elongation, Were evaluated according to the following ASTM standard, and the results are shown in Table 1 below.

<Evaluation method>

Tensile elongation: Measured according to the ASTM D638 method. The test temperature was set at 23 占 폚, and the crosshead speed was set at 50 mm / min.

Flexural Modulus: Measured according to the ASTM D790 method, and the test conditions were measured at 23 캜.

◎ Flow Index: Measured according to ASTM D1238 method, the unit is g / 10min.

division Example Comparative Example One 2 One 2 3 4 Furtherance
(weight%) Polypropylene 87 73 87 92 80 60 magnesium
Hydroxide 5 15 - 5 15 15 denaturalization
Polypropylene 5 5 5 - 5 10 Thermoplastic elastomer 3 7 3 3 - 15 Talc - - 5 - - - Properties Flexural modulus
(Kgf / cm2) 20000 22000 15000 16000 24000 10000 Tensile elongation (%) 100 150 110 90 20 200 Flow index
(g / 10 min) 1.6 1.1 1.8 2.0 2.1 3.2

As shown in Table 1, the polypropylene resin compositions of Examples 1 and 2 according to the present invention had a flexural modulus in excess of 20000 kgf / cm 2, and excellent tensile elongation of more than 100%. . On the other hand, in Comparative Example 1 in which magnesium hydroxide having an aspect ratio of 50 or more was not included, the flexural modulus was considerably reduced, and in Comparative Examples 2 to 3 in which the modified polypropylene and thermoplastic elastomer were not included, flexibility was obtained due to a tensile elongation of less than 100% Respectively. It was confirmed that the flexural modulus was significantly reduced in Comparative Example 4 in which the polypropylene content was less than 70% by weight and the thermoplastic elastomer content exceeded 10% by weight.

10: Loose tube type optical cable 11: Center tension line
12: Loose tube optical fiber unit 13: Optical fiber
14: Loose tube 15: Cushioning material
16: Review of the dog 17: Stiffener
18: Cis

Claims (13)

A polypropylene for a rouge tube excellent in rigidity and flexibility, characterized by comprising 1 to 20% by weight of an inorganic filler having an aspect ratio of 50 or more, 0.1 to 10% by weight of a modified polypropylene, 1 to 10% by weight of a thermoplastic elastomer, Resin composition. The method according to claim 1,
Wherein the inorganic filler is magnesium hydroxide. The polypropylene resin composition for a loose tube according to claim 1, wherein the inorganic filler is magnesium hydroxide. The method according to claim 1,
Wherein the inorganic filler is a plate having a length of 3.5 m or more and a thickness of 70 nm or less at the long side, wherein the polyphenylene resin composition is excellent in rigidity and flexibility. The method according to claim 1,
Wherein the modified polypropylene further comprises one or more reactors selected from the group consisting of an acrylic acid group, a maleic acid group, a maleic anhydride group, a carboxylic acid group, and a hydroxyl group at the end of the polypropylene main chain Wherein the polypropylene resin composition has excellent rigidity and flexibility. The method according to claim 1,
Wherein the thermoplastic elastomer is selected from the group consisting of an olefin-based copolymer, an alpha-olefin-based copolymer, an aromatic vinyl-based copolymer, and a mixture of two or more thereof. . 6. The method of claim 5,
Wherein the thermoplastic elastomer is at least one selected from the group consisting of ethylene-butene copolymers and derivatives thereof, ethylene-octene copolymers and derivatives thereof, ethylene-propylene copolymers and derivatives thereof, copolymers of aromatic vinyl monomers and aliphatic unsaturated hydrocarbons having 2 to 10 carbon atoms, Wherein the polypropylene resin composition is one selected from the group consisting of a mixture of two or more thereof, and the polypropylene resin composition for a loose tube is excellent in rigidity and flexibility. The method according to claim 6,
Wherein the copolymer of the aromatic vinyl monomer and the aliphatic unsaturated hydrocarbon having 2 to 10 carbon atoms is selected from the group consisting of a styrene-butadiene-styrene copolymer, a styrene-isoprene-styrene copolymer, a styrene-ethylene-propylene- Styrene copolymer, and a mixture of two or more thereof. The polypropylene resin composition for a loose tube is excellent in rigidity and flexibility. The method according to claim 1,
Wherein the polypropylene is a propylene homopolymer; Block copolymers of propylene and alpha-olefins; Random copolymers of propylene and alpha-olefins; Terpolymers of propylene, ethylene and alpha-olefins; And a mixture of at least two of them. The polypropylene resin composition for a loose tube is excellent in rigidity and flexibility. 9. The method of claim 8,
Wherein the polypropylene has a flow index of 0.3 to 3 g / 10 min (at 230 캜 under a load of 2.16 kg). The method according to claim 1,
Wherein the resin composition is selected from the group consisting of a lubricant, an antioxidant, a light stabilizer, a releasing agent, a pigment, an antistatic agent, a crosslinking agent, an antibacterial agent, a processing aid, a metal deactivator, a friction agent, a wear- Wherein the polypropylene resin composition further comprises an additive. The polypropylene resin composition for a loose tube is excellent in rigidity and flexibility. In the production of the polypropylene resin composition,
And a mixing step of mixing and kneading the polypropylene as an amount of 1 to 20 wt% of an inorganic filler having an aspect ratio of 50 or more, 0.1 to 10 wt% of a modified polypropylene, 1 to 10 wt% of a thermoplastic elastomer and a remaining amount, A method for producing a polypropylene resin composition for an excellent rouge tube A routed tube for an optical cable, characterized in that it is molded from a polypropylene resin composition for a rouge tube excellent in rigidity and flexibility according to any one of claims 1 to 10. An optical cable comprising the loose tube of claim 12.

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