Halogen-free flame-retardant insulated cable for internal wiring of building

Abstract

The present invention relates to a composition for a halogen-free flame-retardant insulated cable for internal wiring of a building, the composition comprising a flame retardant in an amount of 130 to 160 parts by weight, a lubricant in an amount of 1 to 5 parts by weight, an antioxidant in an amount of 1 to 5 parts by weight, and a coupling agent in an amount of 1 to 5 parts by weight on the basis of 100 parts by weight of a base resin. According to the present invention, by substituting a magnesium hydroxide-based flame retardant, which has been conventionally used, with a sealant-coated aluminum hydroxide in a predetermined amount, flame retardant characteristics can be maintained, and there is an effect of making it possible to manufacture a halogen-free flame-retardant insulated cable for internal wiring of a building at a price 40 to 50% lower than the case of using the magnesium hydroxide-based flame retardant.

Description

Halogen-free flame-retardant insulated cable for building interior wiring

[0001] The present invention relates to a halogen-free flame-retardant insulating cable for internal building wiring, and more specifically, to a halogen-free flame-retardant insulating cable for internal building wiring in which flame retardancy is improved by using a novel combination of flame retardants.

[0002] HF-IX CABLE (Halogen Free Flame-Retardant Polyolefin Insulated Wire, KS C 3341 Low Toxicity Flame-Retardant Cross-linked Polyolefin Insulator) is a wire insulated with low toxicity flame-retardant polyolefin used for wiring in general electrical structures or electrical equipment with a rated voltage of 450 / 750V or less. In this case, magnesium hydroxide (MDH) is used as the main flame retardant in the insulation compound because its high decomposition temperature makes it advantageous for high-temperature operation and working speed when applied to the compound to extrude the wire. When working with HF-IX CABLE using an MDH-applied compound (based on 2.5SQ SIZE), the cable speed is operated very quickly at 300~500 MPM (Meter For Minutes) to increase productivity, and the working temperature is 140~190℃.

[0003] However, the application of MDH has critical disadvantages: it is very expensive, and due to the simplicity of the raw materials used, it frequently becomes very difficult to address issues when problems arise. Therefore, the development of an MDH substitute is essential to reduce costs, broaden the range of choices through raw material diversification, and establish countermeasures for material issues. The required substitute must be inexpensive, resistant to decomposition at high temperatures, and free from productivity issues.

[0004] Korean Patent Publication No. 2013-0053415 presents an additive for improving the mechanical and flame-retardant properties of polyolefins, comprising bohmite, nanoclay, microcrystalline talc, zinc hydroxystannate, and polyolefin oil, which is useful as a sheathing material for electric cables with excellent mechanical properties such as low-temperature bending (UL 1072) and thermodynamic properties (ICEA S-94-649) and flame retardancy.

[0005] In addition, Korean Patent Publication No. 2011-0042239 presents a composition that is not crosslinked and can be used as an insulating material and a covering material for cables or lines, respectively, and has high flexibility, excellent flame retardancy, excellent resistance to organic hydrocarbons, and also excellent processability, comprising: one or more thermoplastic polymers as Component A; one or more C2-C4-α-olefin-vinyl acetate copolymers having a vinyl acetate content of >40 wt% as Component B; one or more plastomers based on ethylene and one or more C4-C8-olefins produced by metallocene catalysis as Component C (wherein Component C is different from Component A); one or more polyolefin homopolymers or copolymers modified with an unsaturated carboxylic acid or a derivative thereof as Component D; one or more flame retardants as Component E; and optionally one or more additional auxiliary agents and additives.

[0006] The purpose of the present invention is to provide a halogen-free flame-retardant insulating cable composition for building interior wiring and a halogen-free flame-retardant insulating cable manufactured therefrom, which can solve the problems associated with the use of MDH while maintaining flame-retardant properties by replacing MDH, a flame retardant used in existing halogen-free flame-retardant insulating cables, with another flame retardant.

[0007] The halogen-free flame-retardant insulating cable composition for internal building wiring according to the present invention may comprise 130 to 160 parts by weight of a flame retardant, 1 to 5 parts by weight of a lubricant, 1 to 5 parts by weight of an antioxidant, and 1 to 5 parts by weight of a coupling agent, based on 100 parts by weight of a base resin.

[0008] A flame retardant according to one embodiment of the present invention may use magnesium hydroxide (MDH) and coated aluminum hydroxide (coated ATH).

[0009] As a flame retardant according to one embodiment of the present invention, it is preferable that coated aluminum hydroxide be included in an amount of 10 to 90 weight percent of the total flame retardant.

[0010] In addition, the coated aluminum hydroxide is preferably aluminum hydroxide with a particle size of 1 to 2 μm coated with a silane compound.

[0011] According to one embodiment of the present invention, it is preferable that the coated aluminum hydroxide be coated using a silane compound to have a coating rate of 0.7% or more and less than 1.5%.

[0012] The base resin of the present invention preferably comprises 20 to 60 parts by weight of LDPE, 20 to 60 parts by weight of POE-based resin, and 20 to 60 parts by weight of Ma-gfrat-LLDPE.

[0013] According to the present invention, by replacing a certain amount of the conventionally used magnesium hydroxide flame retardant with silane-coated aluminum hydroxide, flame retardant properties can be maintained, and it is possible to manufacture a halogen-free flame-retardant insulating cable for building internal wiring that is 40 to 50% cheaper than the magnesium hydroxide flame retardant.

[0014] The present invention will be described in more detail below.

[0015] The terms used in this specification are for describing specific embodiments and are not intended to limit the invention.

[0016] As used herein, the singular form may include the plural form unless the context clearly indicates otherwise. Additionally, as used herein, “comprise” and / or “comprising” specify the presence of the mentioned features, numbers, steps, actions, parts, elements, and / or groups thereof, and do not exclude the presence or addition of one or more other features, numbers, actions, parts, elements, and / or groups.

[0017] The halogen-free flame-retardant insulating cable composition for internal building wiring according to the present invention is characterized by comprising 130 to 160 parts by weight of a flame retardant, 1 to 5 parts by weight of a lubricant, 1 to 5 parts by weight of an antioxidant, and 1 to 5 parts by weight of a coupling agent, based on 100 parts by weight of a base resin.

[0018] The halogen-free flame-retardant insulating cable composition of the present invention is based on not containing halogen compounds, and for this purpose, it is preferable to use a composition comprising 20 to 60 parts by weight of LDPE, 20 to 60 parts by weight of POE-based resin, and 20 to 60 parts by weight of Ma-graft-LLDPE as the base resin.

[0019] The polyethylene-based resin included in the base resin of the present invention is intended for extrusion processability and includes, for example, low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), ultra-high molecular weight polyethylene (UHMWPE), cross-linked polyethylene (XLPE), etc. → I wrote this by including LLDPE as one of the PE-based resins. Please check if this is appropriate. <- It is correct that it is low-density polyethylene (LDPE).

[0020] It is desirable to formulate the composition such that this polyethylene resin is included in an amount of 20 to 60 parts by weight out of 100 parts by weight of the total base resin in order to improve extrusion processability (without increasing the processing torque of the extruder).

[0021] In addition, the polyolefin elastomer (POE) resin included in the base resin of the present invention is preferably included to maintain the physical properties (tensile strength, elongation) of the compound when a large amount of the following inorganic flame retardant is added. For example, when only LDPE is used as the PE resin without using a POE resin as the base resin, a problem arises in which the physical properties deteriorate very severely (tensile strength of 10N or less, elongation of 125% or less). Therefore, in the present invention, it is preferable that the POE resin be included in an amount of 20 to 60 parts by weight out of 100 parts by weight of the total base resin in order to maintain a tensile strength of 10N or more and an elongation of 125% or more.

[0022] In addition, the Ma-gfrat-LLDPE (LLDPE grafted with maleic anhydride) included in the base resin of the present invention plays a very important role in incorporating a large amount of inorganic material (flame retardant) into LDPE and POE, as it is included in an amount of 20 to 60 parts by weight out of 100 parts by weight of the total base resin.

[0023] The Ma-gfrat-LLDPE of the present invention has an affinity for other non-polar base resins such as LDPE and POE, and also, since the polar nature of maleic anhydride has good affinity for inorganic materials and can contain a large amount of inorganic materials (flame retardants), it plays an important role as a compatibilizer in the middle between PE-based resins and inorganic flame retardants.

[0024]

[0025] In addition, the flame retardants included in the halogen-free flame-retardant insulating cable composition according to the present invention may include magnesium hydroxide (MDH) and coated aluminum hydroxide (coated ATH).

[0026] According to one embodiment of the present invention, the flame retardant is preferably included in an amount of 130 to 160 parts by weight per 100 parts by weight of base resin, and the coated aluminum hydroxide among the total flame retardant is preferably mixed with the magnesium hydroxide (MDH) within a range of 10 to 90% by weight to ensure flame retardancy or reduce the cost.

[0027] In addition, the aluminum hydroxide according to the present invention preferably has a particle size of 1 to 2 μm and is coated with a silane-based compound. The silane-based compound used may be any one selected from organic functional silanes. The organic functional group is preferably a vinyl group containing an unsaturated double bond, but is not limited thereto.

[0028] In addition, when coating with the above-mentioned silane compound, it is desirable to control the coating rate to be 0.7% or more and less than 1.5%. The above-mentioned coating rate refers to the weight percentage of the silane compound used, and the coating rate is set so that the entire amount used is coated. Accordingly, when the silane coating rate is less than 0.7%, the extrusion appearance is excellent at low linear speed (390 MPM), but at high linear speed (500 MPM), there is a problem that the extrusion appearance deteriorates, which is undesirable. In addition, when the coating rate exceeds 1.5%, the processing torque in the 25mm PILOT increases too much and the appearance is poor. Also, when extruding a cable in a 90mm extruder, the processing pressure is high, making it difficult to raise the linear speed to 500 MPM, and the extrusion appearance is not secured, so it is undesirable as the intended purpose cannot be achieved.

[0029] In addition, regarding the extrusion speed range that satisfies the extrusion appearance required in the present invention, an extrusion speed of about 300 MPM is acceptable, but since wire manufacturers request 500 MPM or more, it is desirable to match 500 MPM or more to increase productivity.

[0030] In addition, the halogen-free flame-retardant insulating cable composition for internal building wiring according to the present invention may further include lubricants, antioxidants, coupling agents, etc., within a range that does not impair the physical properties thereof, and it goes without saying that the specific materials are not particularly limited and materials known in the art may be used.

[0031] Preferred embodiments of the present invention will be described in detail below. The following embodiments are intended only to illustrate the present invention and should not be interpreted as limiting the scope of the present invention. Furthermore, although specific compounds have been used in the following embodiments, it is obvious to those skilled in the art that equivalents can be used to achieve an equivalent or similar effect.

[0032]

[0033] Comparative Examples 1–5: Confirmation of physical properties due to change in flame retardant

[0034] In the following Comparative Examples 1 to 5, the base resin and other additive compositions were kept constant, and only the flame retardant was used in addition to the currently used MDH, ATH, and MgCO3, either alone or in combination, and the specific compositions are as shown in Table 1 below. The contents used in the following Comparative Examples and Examples are all in parts by weight.

[0035] COMPOUND (Content: parts by weight) Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 LDPE 40 40 40 40 POE-based 30 30 30 30 Ma-graft-LLDPE 30 30 30 30 MDH 140 70-70-ATH(Non Coated)-70 140--MgCO3---70 140 Lubricant 33 33 Anti-oxidant 22 222 Coupling agent 44 444

[0036] LDPE: LG CHEM BC500, POE: SK CHEMICAL SK883, Ma-graft-LLDPE: Hyundai EP GE-400C, MDH: KONOSHIMA S-6

[0037] ATH: NHC H97S, MgCO3: Minelco LH15C,

[0038] Lubricant LION ADVANCED MATERIALS LC-102N,

[0039] Anti-oxidant : Song Won AO 1010

[0040] Coupling agent : DOW OFS-6300

[0041]

[0042] Physical property evaluation

[0043] The properties of the compound prepared with the composition of the table above were evaluated as follows, and the results are shown in Table 2.

[0044] 1) Physical properties at room temperature: Tensile strength and elongation are tested according to the IEC 60811-1 method.

[0045] 2) Flame Retardancy: Tested in Flame Mode according to ASTM D2863.

[0046] 3) Heat resistance evaluation (crosslinking characteristics): Follow the test method of IEC 60502 at 200℃, 15Min, 20N / ㎠.

[0047] 4) The 25mm PILOT T-DIE EXRUDER extrusion test is performed using a LAB. facility with a Full-flight Type screw, and the extrusion appearance is evaluated at a screw L / D of 25 / 1 and a screw compression ratio of 2.4.

[0048] 5) The 90mm cable extruder is a mass production facility for wires, and the screw is a Full-flight Type. The extrusion appearance is evaluated at a screw L / D of 25 / 1 and a screw compression ratio of 2.4. The wire size was evaluated as 2.5SQ.

[0049] COMPOUND Evaluation (25mm PILOT T-DIE EXTRUDER Extrusion) Target Characteristic Evaluation Item Comparison Example 1 Comparison Example 2 Comparison Example 3 Comparison Example 4 Comparison Example 5 Room Temperature Physical Properties Tensile Strength (Kgf / mm²) 17.1 16.4 17.2 15.4 15.6 10 N / mm² ↑ Elongation (%) 260 240 255 272 272 125 ↑ Flame Retardancy Oxygen Index (%) 35 333 335 35 34 ↑ Extrusion Appearance (Low Flux) OOO △△ - Heat Resistance Evaluation HOT Elongation (%) 50 45 45 55 50 100 ↓ SET Permanent (%) 00 -50 -515 ↓

[0050] Referring to the results in Table 2 above, the results of extrusion using a 25mm pilot T-die extruder showed that both the conventional MDH-applied product (Comparative Example 1) and the ATH-applied product (Comparative Example 3) yielded good results. These results indicate that when the compound is extruded in a 25mm pilot extruder, the extruder itself is small, so the discharge speed cannot be increased; consequently, the pressure inside the extruder is not high, which prevents the ATH-applied product from decomposing easily, resulting in a good appearance and good physical properties. In addition, the heat resistance evaluation results (HOT Elongation, SET Permanent) were all satisfactory. This compound was evaluated in a 90mm cable extruder, and the results are shown in Table 3 below.

[0051] CABLE Operation Evaluation (90mm CABLE EXTRUDER Extrusion) Comparison Example 1 Comparison Example 2 Comparison Example 3 Comparison Example 4 Comparison Example 5 CABLE Speed ​​(MPM) 500 500 500 500 500 Extrusion Appearance OXXXX CABLE Speed ​​(MPM) -180 150 150 150 Extrusion Appearance -OOXX

[0052] Referring to the results in Table 3 above, the compound with MDH applied (Comparative Example 1) showed good extrusion appearance at high speeds (500 MPM), whereas all the others without MDH applied (Comparative Examples 2 to 5) showed poor appearance in a breaking form at high speeds. The compounds with ATH applied (Comparative Examples 2 and 3) showed poor appearance at high speeds, but had good appearance and were operable at low speeds (200 MPM or less). The product with MgCO3 applied (Comparative Example 5) showed unsatisfactory extrusion appearance at both high and low speeds.

[0053] Since good workability and appearance were obtained at low line speeds by applying ATH flame retardant, experiments were conducted to see if the problem could be solved by changing the flowability using BASE RESIN and additive (Lubricant, Wax) formulations excluding the flame retardant, as shown in Tables 4 (change in base resin composition) and 7 (change in additive composition), respectively, and the results of the extrusion characteristics evaluation for these compositions are shown in Tables 5-6 and 8-9.

[0054] COMPOUND Comparative Example 6 Comparative Example 7 Comparative Example 8 Comparative Example 9 Comparative Example 10 Comparative Example 11 LDPE 10 10 60 40 60 40 POE-based 60 30 10 10 30 50 Ma-graft-LLDPE 30 60 30 50 10 10 MDH 70 70 70 70 70 ATH (Non Coated) 70 70 70 70 70 Lubricant 33 33 3 Anti-oxidant 22 22 2 Coupling agent 44 4 4 4 4

[0055] COMPOUND Evaluation (25mm PILOT T-DIE EXTRUDER Extrusion) Evaluation Items Comparison Example 6 Comparison Example 7 Comparison Example 8 Comparison Example 9 Comparison Example 10 Comparison Example 11 Target Characteristics Room Temperature Physical Properties Tensile Strength (Kgf / mm²) 16.2 18 13.4 15 14.8 15.1 10 N / mm²↑ Elongation (%) 320 235 222 166 18 22 65 125↑ Flame Retardancy Oxygen Index (%) 33 33 32 34 33 33 34↑ Extrusion Appearance (Low Flux) OOOO△O - Heat Resistance Evaluation HOT Elongation (%) 75 55 40 45 50 50 100 ↓ SET Permanent (%) -10 -5 -50 -5 -5 15 ↓

[0056] CABLE Operation Evaluation (90mm CABLE EXTRUDER Extrusion) Comparison Example 6 Comparison Example 7 Comparison Example 8 Comparison Example 9 Comparison Example 10 Comparison Example 11 CABLE Speed ​​(MPM) 500 500 500 500 500 500 Extrusion Appearance XXXXXX CABLE Speed ​​(MPM) 190 200 200 200 190 190 Extrusion Appearance OOOOOO

[0057] COMPOUND Comparative Example 12 Comparative Example 13 Comparative Example 14 Comparative Example 15 Comparative Example 16 Comparative Example 17 LDPE 40 40 40 40 40 POE-based 30 30 30 30 30 Ma-graft-LLDPE 30 30 30 30 30 MDH 70 70 70 70 70 ATH (Non Coated) 70 70 70 70 70 Lubricant 34 53 3 Silicon WAX---1 23 Anti-oxidant 22 22 2 Coupling agent 44 4 4 4 4

[0058] COMPOUND Evaluation (25mm PILOT T-DIE EXTRUDER Extrusion) Evaluation Items Comparison Example 12 Comparison Example 13 Comparison Example 14 Comparison Example 15 Comparison Example 16 Comparison Example 17 Target Characteristics Room Temperature Physical Properties Tensile Strength (Kgf / mm²) 17 16.8 16.8 16.9 16.2 16.1 10 N / mm²↑ Elongation (%) 26 226 5 26 5 26 0 26 7 26 7 12 5↑ Flame Retardancy Oxygen Index (%) 3 3 32 32 33 3 4 3 4 3 4↑ Extrusion Appearance (Low Flux) OOOOOO- Heat Resistance Evaluation HOT Elongation (%) 5 0 6 5 7 0 6 0 7 5 8 0 10 0↓ SET Permanent (%) 0 - 5 - 5 - 10 - 10 - 10 15↓

[0059] CABLE Operation Evaluation (90mm CABLE EXTRUDER Extrusion) Comparative Example 12 Comparative Example 13 Comparative Example 14 Comparative Example 15 Comparative Example 16 Comparative Example 17 CABLE Speed ​​(MPM) 500 500 500 500 500 500 Extrusion Appearance XXXXXX CABLE Speed ​​(MPM) 200 200 190 190 190 190 Extrusion Appearance OOOOOO

[0060] Referring to the results in Tables 5–6 and 8–9 above, the appearance was good only at a working speed of 200 MPM in the CABLE extruder after testing changes in base resin and additives. Consequently, it was found that increasing the speed by changing the base resin and additives did not have a significant effect. Therefore, it is determined that the applied flame retardants, MDH and ATH, have the greatest influence.

[0061] Accordingly, the next experiment was conducted by applying the coated ATH.

[0062] COMPOUND Comparative Example 1 Comparative Example 18 Comparative Example 19 Comparative Example 20 Comparative Example 21 LDPE 40 40 40 40 40 POE-based 30 30 30 30 30 Ma-graft-LLDPE 30 30 30 30 MDH 140-70-70 ATH (Fatty Acid Coating)* - 14070 -- ATH (Silane Coating)** -- - 14070 Lubricant 33333 Anti-oxidant 22222 Coupling agent 44444 * ATH (Fatty Acid Coating): Coating with a 0.5% coating rate using fatty acids** ATH (Silane Coating): Coating with a 0.5% coating rate using vinyl silane

[0063] COMPOUND Evaluation (25mm PILOT T-DIE EXTRUDER Extrusion) Evaluation Items Comparison Example 1 Comparison Example 18 Comparison Example 19 Comparison Example 20 Comparison Example 21 Target Characteristics Room Temperature Physical Properties Tensile Strength (Kgf / mm²) 17.1 16 16.5 16.8 16.5 10 N / mm²↑ Elongation (%) 260 240 235 255 261 125↑ Flame Retardancy Oxygen Index (%) 35 31 35 34 35 34↑ Extrusion Appearance (Low Flux) OOOOO- Heat Resistance Evaluation HOT Elongation (%) 50 85 60 55 55 100↓ SET Permanent (%) 0 - 5 - 5 - 5 - 51 5↓

[0064] CABLE Operation Evaluation (90mm CABLE EXTRUDER Extrusion) Comparative Example 1 Comparative Example 18 Comparative Example 19 Comparative Example 20 Comparative Example 21 CABLE Speed ​​(MPM) 500 500 500 500 500 Extrusion Appearance OXXXX CABLE Speed ​​(MPM) -160 170 390 380 Extrusion Appearance -OOOO

[0065] Referring to the results in Tables 11 and 12 above, when Silane Coated ATH was applied, the vessel speed increased up to 500 MPM, but the appearance was not good; however, the working vessel speed could be increased up to 380–390 MPM. It was found that the appearance and flame retardancy were also good when Silane Coated ATH was applied.

[0066] Below, application experiments were conducted by adjusting the silane coating rate.

[0067] COMPOUND Comparative Example 1 Comparative Example 2 2 Comparative Example 23 Comparative Example 24 LDPE 40 40 40 40 POE-based 30 30 30 30 Ma-graft-LLDPE 30 30 30 30 MDH 1 40 --- ATH (Silan coating rate 0.5%) - 1 40 -- ATH (Silan coating rate 1.0%) -- 1 40 ATH (Silan coating rate 1.5%) --- 1 40 Lubricant 3 3 3 Anti-oxidant 2 2 2 2 Coupling agent 4 4 4 4

[0068] COMPOUND Evaluation (25mm PILOT T-DIE EXTRUDER Extrusion) Evaluation Items Comparison Example 1 Comparison Example 2 2 Comparison Example 23 Comparison Example 24 Room Temperature Physical Properties Tensile Strength (Kgf / mm²) 17.1 16.9 16.9 Appearance NG Elongation (%) 260 253 261 Flame Retardancy Oxygen Index (%) 353 334 Extrusion Appearance (Low Flux) OOO Heat Resistance Evaluation HOT Elongation (%) 505 550 SET Permanent (%) 000

[0069] CABLE Operation Evaluation (90mm CABLE EXTRUDER Extrusion) Comparison Example 1 Comparison Example 2 2 Comparison Example 23 Comparison Example 24 CABLE Line Speed ​​(MPM) 500 500 500 Appearance NG Extrusion Appearance OXOCABLE Line Speed ​​(MPM) -390 -Extrusion Appearance -O-

[0070] Referring to the results in Tables 14 and 15 above, when applying ATH with a Silane Coating rate of 1%, the appearance was excellent and physical properties were good even when the ship speed increased up to 500 MPM, but flame retardancy was slightly lacking.

[0071] In the following, to improve flame retardancy, silane-coated 1% ATH (aluminum hydroxide with a particle size of 1–2 µm) was adopted and the content was adjusted for experiments.

[0072] COMPOUND Comparative Example 1 Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 LDPE 40 40 40 40 40 40 40 POE-based 30 30 30 30 30 30 30 Ma-graft-LLDPE 30 30 30 30 30 30 30 MDH 140 130 110 90 70 50 30 10 Silane-coated ATH (coating rate 1.0%) - 10 30 40 70 90 110 130 Lubricant 33 33 333 Anti-oxidant 22 22 222 Coupling agent 44 44 44 44

[0073] COMPOUND Evaluation (25mm PILOT T-DIE EXTRUDER Extrusion) Evaluation Items Comparison Example 1 Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Room Temperature Physical Properties Tensile Strength (Kgf / mm²) 17.1 17 16.8 15.7 16.5 16.2 16 16.1 Elongation (%) 260 260 258 270 265 255 240 245 Flame Retardancy Oxygen Index (%) 35 35 35 36 35 36 3433 Extrusion Appearance (Low Flux) OOOOOOOO Heat Resistance Evaluation HOT Elongation (%) 50 50 50 55 50 50 4550 Permanent (%) 00 00 000

[0074] CABLE Operation Evaluation (90mm CABLE EXTRUDER Extrusion) Comparative Example 1 Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 CABLE Line Speed ​​(MPM) 500 500 500 500 500 500 500 500 Extrusion Appearance OOOOOOOO CABLE Line Speed ​​(MPM) -------- Extrusion Appearance --------

[0075] Referring to the results in Tables 17 and 18 above, all of the ATHs with a Silane Coating rate of 1% applied from 10 to 90 PHR showed good physical properties, flame retardancy, and extrusion appearance at high flux (500 MPM).

Claims

A halogen-free flame-retardant insulating cable composition for internal building wiring comprising 130 to 160 parts by weight of a flame retardant, 1 to 5 parts by weight of a lubricant, 1 to 5 parts by weight of an antioxidant, and 1 to 5 parts by weight of a coupling agent, based on 100 parts by weight of a base resin. In Article 1, A halogen-free flame-retardant insulating cable composition for building internal wiring, wherein the flame retardant is magnesium hydroxide (MDH) and coated aluminum hydroxide (coated ATH). In Article 2, A halogen-free flame-retardant insulating cable composition for building internal wiring, wherein the coated aluminum hydroxide among the flame retardants is included in an amount of 10 to 90 weight percent of the total flame retardant. In Article 2, The above-mentioned coated aluminum hydroxide is aluminum hydroxide with a particle size of 1 to 2 μm coated with a silane-based compound, a halogen-free flame-retardant insulating cable composition for internal building wiring. In Article 2, A halogen-free flame-retardant insulating cable composition for internal building wiring, wherein the coated aluminum hydroxide is coated using a silane compound at a coating rate of 0.7% or more and less than 1.5%. In Article 1, A halogen-free flame-retardant insulating cable composition for internal building wiring, comprising a base resin consisting of 20 to 60 parts by weight of LDPE, 20 to 60 parts by weight of POE-based resin, and 20 to 60 parts by weight of Ma-gfrat-LLDPE.