KR100855041B1 - Flame retardant polypropylene composition using cd tube - Google Patents

Abstract

A polypropylene composition for flame resistant flexible CD tubes is provided to realize excellent flame resistance despite the use of a polypropylene resin, to impart excellent workability and impact strength, and to prevent generation of harmful gases. A polypropylene composition for flame resistant flexible CD tubes comprises: (A) 100 parts by weight of polypropylene; and (B) 2-10 parts by weight of flame resistant master batch comprising 100 parts by weight of polypropylene or polyethylene, 10-80 parts by weight of BDDP(tetrabromobisphenol A bis(2,3-dibromopropyl) ether) as a flame retardant, 10-50 parts by weight of Sb2O3 as a flame retardant, 1-10 parts by weight of a UV stabilizer, and 1-10 parts by weight of a first and a second antioxidants.

Description

Polypropylene composition for flame retardant flexible conduit {FLAME RETARDANT POLYPROPYLENE COMPOSITION USING CD TUBE}

The present invention relates to a polypropylene composition for a flame retardant flexible conduit which can produce a flame retardant flexible conduit having excellent flame retardancy even when using a polypropylene resin that is difficult to produce a flame retardant flexible (flexible) conduit (CD tube).

In addition, the present invention relates to a polypropylene composition for a flame retardant flexible conduit having excellent flame retardancy, workability and impact strength even when a small amount of flame retardant is used, and which can prevent toxic gases from being severely generated.

In general, corrugated pipes are mainly made of high density polyethylene (HDPE) as the main plastic material of CD pipes (corrugated pipes), and produced flame-retardant flexible conduit tubes even with a little PVC material.

However, HDPE has various problems when manufacturing a flexible conduit and is still not perfect as a flame retardant flexible conduit. In other words, since 12 to 15% of flame retardant is used for the flame retardant effect in HDPE, the physical property is weak and the impact strength is weak so that it is easily broken. In addition, toxic gas is emitted during combustion of the flexible conduit, which may cause asphyxiation in a fire.

In addition, there is a problem that a large amount of heavy metal (Pb) is contained as well as productivity is reduced due to the addition of a large amount of flame retardant to HDPE. In addition, in the summer, the flexural modulus of the flexural conduit intermittently falls (expressed as the CD tube is soft), and in winter, there is a problem of being broken by the impact. In addition, in the case of PVC is excellent in flame retardancy, but there is a problem that it is difficult to use as a flexible conduit having a flame retardancy because it is inferior in stability after bending.

It is an object of the present invention to provide a polypropylene composition for a flame retardant flexible conduit which can produce a flame retardant flexible conduit having excellent flame retardancy even when using a polypropylene resin that is difficult to produce a flame retardant flexible conduit.

Another object of the present invention is to provide a polypropylene composition for a flame retardant flexible conduit which has excellent flame retardancy, workability and impact strength even when a small amount of flame retardant is used, and which can prevent generation of toxic gas.

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The polypropylene composition for flame-retardant flexible conduit of the present invention comprises (A) 100 parts by weight of polypropylene (B) 10-80 parts by weight of BDDP flame retardant, 10-50 parts by weight of Sb ₂ O ₃ flame retardant, 100 parts by weight of polypropylene or polyethylene, 1-10 parts by weight of the UV stabilizer, 1-10 parts by weight of the first and second antioxidants, characterized in that 2 to 10 parts by weight of a flame retardant masterbatch prepared by mixing.

The polypropylene composition prepared according to the present invention can produce a flame retardant flexible conduit having excellent flame retardancy even with a polypropylene resin, which is conventionally difficult to produce a flame retardant flexible conduit.

In addition, even if a small amount of flame retardant is used to obtain an excellent flame retardant effect, it is possible to prevent the generation of toxic gases severely.

In addition, in the case of producing a flexible conduit, in the case of producing a high-density polyethylene (HDPE) flexible (flexible) conduit, the flame retardant is adsorbed inside the extruder in 3-4 days, making it difficult to adjust the thickness and disassembling and cleaning the DIES. CD pipe) There is no problem of DIES adsorption in production, so there is no need to open and clean DIES.

In addition, since the inexpensive polypropylene resin is used as a main raw material, there is an advantage that the manufacturing cost is very low compared to the warp (flexible) conduits made of conventional polystyrene, PVC, and the like.

EMBODIMENT OF THE INVENTION Hereinafter, the polypropylene composition for flame-retardant bending conduits of this invention is demonstrated in detail.

The polypropylene composition for flame retardant flexible conduit according to the embodiment of the present invention is 0.5 to 7 parts by weight of BDDP flame retardant, antimony trioxide (Sb) based on 100 parts by weight of a polypropylene block copolymer having a melt melt index (D1238) of 0.5 g / 10 min or less. ₂ O ₃ ) 0.1 to 5 parts by weight, 0.01 to 3 parts by weight of dispersant, 0.02 to 6 parts by weight of the first antioxidant, 0.01 to 6 parts by weight of the second antioxidant, 0.1 to 2 parts by weight of UV stabilizer .

The polypropylene polymer is a polypropylene resin having a melt index (MFR) ASTM D-1238 of 0.1 to 2 g / 10 min, and preferably a copolymer having a melt index of 0.1 to 1 g / 10 min.

The flame retardant is BDDP [Terabromobisphenol A bis (2,3-dibromopropyl ether]], and is used in polypropylene in an amount of 0.5 to 7 parts by weight in 100 parts by weight.

Also, antimony trioxide (Sb ₂ O ₃ ) is also used as a flame retardant, 0.1 to 2 parts by weight based on 100 parts by weight of polypropylene.

The first antioxidant is a waste nil antioxidant [C ₇₃ H ₁₀₈ O ₁₂ ; Pentaerythritol tetrakis (3,5-di-tert-butyl-4-hydr, Fenozan 32)] (product name ANOX 20) is preferably used at 0.1 to 2 parts by weight based on 100 parts by weight of polypropylene.

The second antioxidant is a phosphoric acid-based antioxidant [C ₄₂ H ₆₃ O ₃ P: Tris (2,4-di-t-butylphenyl) phosphite] (trade name ALKANOX 240) 0.1 to 2 with respect to 100 parts by weight of polypropylene It is preferably used in parts by weight.

UV stabilizer uses a HALS (Hindered Amine Light Stabilizer) compound is preferably used in 0.2 to 3 parts by weight based on 100 parts by weight of polypropylene. Specific examples of such HALS compounds include hydroxybutyl methylphenylchlorobenzotriazole and the like. Such UV stabilizers can prevent discoloration, oxidation, and the like even when exposed to light during migration or fielding.

On the other hand, the impact modifier may be further added to the impact reinforcement of the polypropylene composition for flame retardant flexible conduit. In this case, the impact modifier uses a polypropylene (PP) and polyethylene (PE) containing a metalocene catalyst, EPDM, EVA and other impact reinforcement may be used and 0.5 to 10 parts by weight relative to the polypropylene desirable. Impact modifiers may be added in large amounts in the winter when broken, or may not be added depending on the condition.

When the BDDP flame retardant, antimony trioxide (Sb ₂ O ₃ ), dispersant, 0.02 to 6 parts by weight of the first antioxidant, the second antioxidant, and the UV stabilizer are added in a mixed amount or less, the respective effects are lowered and added in a mixed amount or more. The cost increases.

On the other hand, the polypropylene composition for flame retardant flexible conduit according to another embodiment of the present invention can be prepared using 2 to 10 parts by weight of flame retardant masterbatch to 100 parts by weight of polypropylene. At this time, the composition of the flame retardant masterbatch is 10 to 80 parts by weight of BDDP flame retardant, 10 to 50 parts by weight of Sb ₂ O ₃ flame retardant, 1 to 10 parts by weight of UV stabilizer, 1,2 antioxidant 1 to 100 parts by weight of polypropylene or polyethylene It is prepared by mixing ~ 10 parts by weight.

Hereinafter, preferred examples and comparative examples are provided to aid in understanding the present invention, but the following examples are merely to illustrate the present invention, and the scope of the present invention is not limited to the following examples.

<Example 1>

100 kg of polypropylene (Y-120 MFR: 1), 3 kg of BDDP, 1 kg of Sb ₂ O ₃ , 0.1 kg of ANOX20 (manufactured by ASIA STABILIZERS CO., LTD) as waste-neil antioxidant, ALKANOX240 (ASIA STABILIZERS CO) , LTD) 0.3kg, 7kg TPR (metarosene + PP) as an impact modifier in a mixer (SUPER MIXER) and stirred and melt-extruded using a conventional extruder to produce pellet (PELLET), This was extruded to produce a flexural conduit (CD tube).

As a comparative example, a flexible conduit (CD tube) made of general high-density polyethylene (HDPE) was fabricated, and the impact strength, flame retardancy, flexural strength, and workability were compared.

Example 2

Polypropylene, BDDP, Sb ₂ O ₃ , antioxidants were mixed in the same amount as in Example 1, TPR (metarosene + PP), an impact modifier, was mixed 14 kg, and a flexible conduit was manufactured in the same manner as in Example 1. It was. The impact strength, flame retardancy, flexural strength and workability of the manufactured flexural conduits were measured and shown in Table 1.

Example 3

Polypropylene, BDDP, Sb2O3, antioxidants were mixed in the same amount as in Example 1, TPR (metarosene + PP) as an impact modifier was mixed 24kg, and a flexible conduit was prepared in the same manner as in Example 1. The impact strength, flame retardancy, flexural strength and workability of the manufactured flexural conduits were measured and shown in Table 1.

<Example 4>

100kg of polypropylene (B-310 MFR: 0.5), 2.1kg of BDDP, 0.7kg of Sb ₂ O ₃ , 0.2kg of UV stabilizer (UV 944), 0.1kg of waste-neil antioxidant ANOX20 (product of ASIA STABILIZERS CO., LTD), phosphoric acid 0.3 kg of the antioxidant ALKANOX 240 (ASIA STABILIZERS CO., LTD) and 0.2 kg of the dispersant (ZN-ST) are mixed and stirred in a SUPER MIXER and melt-extruded using a conventional extruder to produce pellets. Then, this was extruded to produce a flexural conduit (CD tube). The impact strength, flame retardancy, flexural strength and workability of the manufactured flexural conduits were measured and shown in Table 1.

Example 5

100kg of polyethylene, BDDP 60kg, Sb ₂ O ₃ 30kg, UV stabilizer (UV 944) 4kg, Waste Nil antioxidant ANOX20 (product of ASIA STABILIZERS CO., LTD) , 2 kg of a dispersant (Zn-St) was added to the blender and stirred, followed by melt extrusion using a conventional extruder to produce a flame retardant masterbatch of PELLET.

A flame retardant masterbatch 7 kg was mixed with 100 kg of polypropylene (MFR 0.5) and extruded to produce a flexural conduit (CD tube). The impact strength, flame retardancy, flexural strength and workability of the manufactured flexural conduits were measured and shown in Table 1.

Comparative Example 1

100kg polyethylene, 181.5kg decabrom, 77.8kg Sb ₂ O _3, 7.4kg ZN-ST, 1.9kg UV 1.9kg, 1.9kg ANOX20, blended and stirred in a blender and melt-extruded using a conventional extruder The batch was created.

A flexible conduit (CD tube) was made by mixing and extruding 25 kg of polyethylene masterbatch with 25 kg of HDPE. The impact strength, flame retardancy, flexural strength and workability of the manufactured flexural conduits were measured and shown in Table 1.

<Property Characteristics>

Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Flame retardant (UL94Vo) V2 V2 V2 V2 V2 Get burned Impact strength Very weak weakness Good Good Good weakness Workability Extruded amount falls Extruded amount falls Extruded amount falls Good Good Flame retardant builds up in extruder DIE (DIE cleaning every 3-4 days) Price (price per M of CD) 106 won / M 109 won / M 127 won / m 104 won / M 100 won / M 127 won / m Toxic gas (when burning) Small amount occurrence Small amount occurrence Small amount occurrence Small amount occurrence Small amount occurrence Large quantities importance 0.92 0.92 0.91 0.92 0.92 1.11 Flame retardant content (%) 3.60% 3.40% 3.10% 2.70% 2.60% 14.00%

As shown in Table 1, the flexible conduit (CD tube) of Examples 1 to 3 is excellent in flame retardancy, but in the case of Example 1, the impact strength is very weak, and Example 2 is somewhat weak. In addition, Example 3 has good flame retardancy and impact strength, but has a problem in commercialization after development due to a decrease in extrusion amount and high raw material cost.

On the other hand, Example 4 has excellent flame retardancy even if the use of a smaller amount of flame retardant than in the case of Examples 1 to 3 can further reduce the content of the flame retardant, it can be seen that has a good workability.

In Example 5, even after using the polypropylene after fabricating the flame retardant masterbatch, it can be seen that it has excellent flame retardancy and good workability as in Example 4.

And, Comparative Example 1 can be seen that even when a large amount of flame retardant enters the flame retardancy and the impact strength due to the excessive amount of flame retardant is dropped. In other words, in order to flame-retardant flexible conduit with the desired flame retardant grade using HDPE, even if a large amount of flame retardant is added as in Comparative Example 1, the flame retardant effect is not suitable for the desired UL grade and the impact strength is significantly lower than that of the general flame retardant. . Therefore, there are still many difficulties in the construction site due to the flame retardant problem and cracking of the flexible conduit.

On the other hand, the flexible conduit of the present invention can produce a flame-retardant flexible conduit by solving the problem of weak impact strength and weak weatherability of polypropylene.

Claims (10)

delete delete delete delete delete (A) 100 parts by weight of polypropylene (B) 10-80 parts by weight of BDDP flame retardant, 10-50 parts by weight of Sb ₂ O ₃ flame retardant, 1-10 parts by weight of UV stabilizer, 2 Flame retardant polypropylene composition for a flame-retardant flexible conduit characterized in that 2 to 10 parts by weight of a flame retardant masterbatch prepared by mixing 1 to 10 parts by weight of antioxidant. The polypropylene composition according to claim 6, further comprising 2-10 parts by weight of an impact modifier. The polypropylene composition according to claim 6, wherein the UV stabilizer is a HALS UV stabilizer. 7. The polypropylene composition according to claim 6, wherein the first antioxidant is a waste nil-based antioxidant. 7. The polypropylene composition according to claim 6, wherein the second antioxidant is a phosphoric acid-based antioxidant.