TW524826B - Covering material for low-smoke free-halogen cable - Google Patents

Abstract

A covering material for the low-smoke free-halogen cable is provided by the present invention. The covering material is consist of (A) a base polymer, which is a mixture of ethylene-vinylacetate copolymer (EVA) and low-density polyethylene (LDPE), (B) a flame-retardant, (C) an anti-oxidant, (D) a processing-assisted component, and E) a PE-improving component, which is PE with maleic anhydride (MAH) branched thereof.

Description

524826 _1 No. 90123254 The month tT of the following year V. Description of the invention (1) Field of the invention The present invention relates to a cable coating composition. Modification, especially an environmentally friendly electricity. BACKGROUND OF THE INVENTION Electric cables are commonly used in power lines, communication lines and light-flammable buildings, MRT, shopping malls, and office buildings. Once the cable is damaged due to fire, the smoke exhaust system, alarm system, notification system, etc. required for evacuation will not work, which will not only affect the escape but also damage the rescue. Because of &, the materials used for coatings other than electric cables and wires must be specially flame-resistant. The outer covering of the cables used is mainly made of polyvinyl chloride (PVC, ρο1 ^ γνιηγ1 chloride) as the base material. Since the PVC material will release milk ions or hydrogen acid when it is burned, it can capture free radicals that cause fire to spread. , To achieve the effect of suppressing the chain reaction, so it can slow down the spread of fire. However, when PJC materials are burned, not only toxic gases such as dioxin, but also a large amount of f-smoke and corrosive gases are generated. The dense smoke generated at the fire scene prevents evacuation and rescue work. 'Corrosive gases can cause humans to inhale when inhaled. Pulmonary edema and even death 'also corrode machinery and equipment, causing great property damage. ^ In order to improve the problems caused by the combustion of PVC raw materials, polystyrene resins, polyethylene, polypropylene or their copolymers (such as ethylene-vinyl acetate copolymer, ethylene-vinyl acetate copolymer) have been developed. 'Hereinafter referred to as EVA resin) is the cable covering of the substrate. However, these materials are inherently flammable, so additional flame retardants must be added to

Page 4 2002.1.15.004 524826 _Case No. 90123254_ & Rev. Π / 月 f 日 _ V. Description of the invention (2) Flame resistance is achieved, because most of the flame retardants are inorganic particles, and the base polymer is organic matter, and The amount is very high (usually 0.5 to 2 times of the base polymer), and the inorganic particles are not easily dispersed in the base polymer, so the resulting blend is heterogeneity, which is easily generated during molding The pores cause the mechanical strength of the cable coating to decrease. The general way to improve compatibility is to surface treat inorganic inorganic flame retardants with compounds such as stearic acid or oleic acid to improve the dispersibility of flame retardants (see US Patent No. 4, 6 7 1, 8 9 6), Although this method can solve the problem of poor compatibility between the inorganic particles and the polymer of the substrate, the disadvantage is that the processing cost of the required stearic acid or oleic acid is quite high. Therefore, the present invention provides an environmentally friendly electric wire coating composition to solve the above disadvantages. SUMMARY OF THE INVENTION The object of the present invention is to provide an environmentally friendly cable coating composition, which has a much lower smoke emission when burned than P V C plastic. Another object of the present invention is to provide an environmentally friendly electric wire coating composition, which does not generate dioxin and corrosive gases during combustion, thereby protecting human health and property equipment safety. A further object of the present invention is to provide an environmentally friendly cable wire coating composition, which has the characteristics of being recyclable and is in line with environmental protection benefits. Another object of the present invention is to provide an environmentally friendly cable coating composition, which not only has the above-mentioned advantages of safety and environmental protection, but also does not damage the physical properties of the manufactured product. ‘

Page 5 2002.1.15.005 524826 No. 1 90123254 V. Description of the invention (3) Another object of the present invention is to provide a product # n ¥ 保 电 Continue 线 被 霜 @ 组合, which contains a PE modifier to improve The helmet is free of color, and the compatibility between the polymer of the organic particle toilet substrate and the amount of PE modifier is small. An aspect of the present invention is to provide an environmental protection tape ^ A clothing 1 cable coating composition, comprising: A) 100 parts by weight of a substrate polymer, η, is ethylene-vinyl acetate copolymer (EVA) and A mixture of low density polyethylene (LDPE); B) a flame retardant of 100 to 200 parts by weight; C) an antioxidant of 1 to 4 parts by weight; D) a processing aid of 1 to 5 parts by weight; and E ) 5 to 20 parts by weight of PE modifier, which is a graft polymer of maleic anhydride grafted on polyethylene (PE). Detailed description of the invention The environmentally friendly cable coating composition according to the present invention, mainly Contains the following five ingredients.

Component A Component A according to the present invention is a base polymer, which includes Ethylene-vinylacetate copolymer (EVA) and low-density polyethylene (LDPE). As a reference, EVA accounts for 40 to 90% by weight, and preferably 60 to 80% by weight. The melting index (MI) of LDPE is preferably between 0.5 and 5

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G / 10 minutes, more preferably between 5 and 5 g / minute. The melting index of EVA is preferably between 0 ° and 10 g / 10 minutes, and most preferably; I is between 1 and 5 g / 10 minutes. The content of yVAI's vinyl acetate is preferably from "to" weight%, more preferably from 20 to 30 weight ° / 〇. Ingredient B Ingredient B according to the present invention is an inorganic flame retardant. The use of inorganic flame retardants to retard combustion is known in the art. The inorganic flame retardant according to the component B of the present invention is preferably hydrated aluminum hydroxide (A1 (〇Η) 3 · 3Η2〇) or hydrazine, magnesium oxide, etc. These hydrates decompose into oxides and endotherms at high temperature. Water vapor can achieve the fire extinguishing effect of cooling and suffocation. At the same time, it can also help to suppress the free radicals generated during the combustion process in order to slow down the chain reaction.

Ingredient C Ingredient C according to the present invention is an antioxidant. Its function is to slow down the automatic oxidation rate of tritium molecular materials. The conditions for selection are good oxidation resistance, good compatibility with polymer materials, and processing temperature. Stability & reaction with other auxiliaries, does not change color), non-toxic, does not affect other characteristics of high score ^. Suitable antioxidants are used in the art such as amidines (for example, containing monophenols, polyphenols, hydroquinone, thiobifluorene), amines (diphenylamine, p-phenylenediamine), thioesters, and mixtures thereof . Che Fujia became c. For example, dilauryl thiodipropionate, MS [3 一 (3 ’, 5, _ 上 丁 使

2002.11.15.007 524826

Case No. 90123254 V. Description of the invention (5) Oxidant, 1010) 1,1 4'-hydroxyphenyl) propionic acid] pentaerythritol ester (anti-thiobis (2-phenol).

Ingredient D Ingredient D suitable for the present invention is a processing aid, which is uniform and easy to extrude. It is mainly used by skilled artisans to mix plastics (microcrystalline wax), stearic acid, stone oil, microcrystalline wax ' Is better.

Ingredient E

The component E according to the present invention is a PE modifier, and grafted with maleic acid liver on the composite substrate. Its function is to be configured to simultaneously increase the compatibility between the component A and the component k in the amount of PE. Sex. Component E is based on the weight of component E grafted with maleic anhydride on a polyethylene (PE) graft base, wherein the content of maleic anhydride is 0.5 to 10% by weight, preferably 1 to 5% by weight, The content of polyethylene (PE) is 90 to 99.5% by weight, preferably 95 to 90% by weight. F. Examples 1 to 3 I prepare the cable coating frost> one w Put the two kinds of cable outer coating formulations in the mixed weight ratio of Table 1 respectively, and then knead and granulate by conventional methods, followed by hot pressing The forming method presses out the cable. Table 1 shows the three types of cable coatings made, and the a material formula ’are the low-elongation cable coating and the high-elongation cable, respectively.

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Page 9 2002.11.5.009 524826 _Case No. 90123254_ Year 丨 (Month (Cantonese _ ^ _ V. Description of Invention) (7) Combustion test The above three products are subjected to a combustion test. The oxygen index value, smoke generation, and combustion obtained The results of gas pH, toxicity index, dioxin content and other data are shown in Table 3. The test standards are as follows: 1. Oxygen index value-according to ASTM D2 8 68 2. Smoke volume-Take the thickness of (K5 ± 0.1 mm test Sheet, according to ASTM Ε662 3. Combustion gas pH-according to IEC 754-2 4. Toxicity index-according to NES 713 5. Dioxin content-according to Environmental Protection Agency ΝΙΕΑ Α810.10B Compare you] Cover the cable traditionally made of PVC substrate The combustion test was performed as in Examples 1-3, and the results are shown in Table 4.

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_ Case No. 90123254 V. Description of the invention (8) Compound gas and wearing combustion gas Use nature. In the acid place, the PE reformed group has quite inorganic resistance. According to the comparison of Tables 3 and 4, it can be found that the smoked cable is covered by the flame test. $ ^ ΊWire coating f ^ ^ The amount of smoke generated and the content of toxic aoxine is much lower than that made from PVC substrates | Yan M. ^-Any one is lower, the oxygen index and inspection degree are relatively high, and the cable cover is recyclable Therefore, the cable coating made by the composition of the invention has both environmental protection and safety know-how. The stearic acid or oil cost required for the surface treatment of the inorganic flame retardant is quite high, and the environmental protection cable coating composition of the present invention is tfO. Based on 1 part by weight of the base polymer, only 5 to 20 parts by weight of the shellfish are needed, and its cost is only about 50% of the surface treatment. In addition, the elongation and tensile strength of the cable cover made of this product also show a high level, which can confirm that the PE modifier can effectively improve the compatibility of the substrate polymerization and the fuel. As mentioned above, this case is indeed a novel, progressive and practical invention, and the application is filed. <

524826 Case No. 90123254 Year V Π 月 ίΓ Revision V. Description of the invention (9) The present invention can be modified by people skilled in the art as a craftsman, but it can not be separated from the protection of the scope of patent application.

Page 12 2002.11.15.012 524826 Case No. 90123254 Amendment Brief description of the page Page 13 2002.11.15.013

Claims (1)

public 备 丄 / 月 月 日 1 · An environmentally friendly cable coating composition, containing A) 100 parts by weight of the base polymer, which is a mixture of EVA and low-density polyethylene (LDPE), acetic acid, ethyl acetate, ° δ; β) 1 0 0 to 2 0 0 weight Parts of a flame retardant, 14 magnesium oxide; /, is aluminum hydroxide c) 1 to 4 parts by weight of an antioxidant; D) 1 to 5 parts by weight of a processing aid; and E) 5 to 20 parts by weight of PE Modifier, which is a graft polymer on ethylene (PE). ", Malay, Chu and Sf names. For example, if the environmental protection cable of the patent application No. 1 is 厶 A AW U, take this π ... Tian Ju ^ coating composition component A ethylene-vinyl acetate copolymer accounts for 40-9 0% by weight 3. If the environmental protection electricity in the scope of the patent application is the first item, the cable / 0 ° component A of the ethylene-vinyl acetate copolymer melting / covering composition g / 10 minutes. E The vote is If the environmental protection electric double wire of item 3 in the scope of patent application is applied, Cheng Gong A will be covered by Guangbi-He capsule A. It will cover the composition of ethylene-vinyl acetate copolymer in composition component A / In 10 minutes, your indicator is between 1 and 5. · If the scope of the patent application is 1 item, the clothing protection and electric power increase 8 A ii U, take the €, the ethylene-vinyl acetate copolymer in the component A of the wire coating composition The content of vinyl acetate is 18 to 33% by weight. 6 · Environmental protection as described in item 5 of the patent application. ° ° & Λ ^ ^ < The content of vinyl acetate is 20 to 30% by weight. 7 · Environment-friendly electrical wall as described in the first item of the patent application ^ Online line coating composition ^ hydroxide or branched alkenyl copolymerized to polyethylene, wherein wherein • 5 to 10, wherein to 5, wherein wherein wherein Page 14 2002.11.15.014 524826 Page 15 2002.11.15.015 524826 _ Case No. 90123254_11 I (month) Guang Yue _ Charm ___ Sixth, the scope of patent application. 8. The environmentally friendly cable coating composition according to item 7 of the scope of patent application, wherein the melting index of the low-density polyethylene in component A is between 1 and 5 g / 10 minutes. 9. The environmentally friendly cable coating composition according to item 1 of the patent application scope, wherein the oxidizing agent comprises phenols, amines, thioesters, and mixtures thereof. 10. The environmentally-friendly cable coating composition according to item 1 of the scope of the patent application, wherein the processing aid comprises Shi Xijing oil, micr (micro-cran), stearic acid ester. 1 1. The environmentally friendly cable coating composition according to item 1 of the scope of patent application, wherein the content of maleic anhydride in component E accounts for 0.5 to 10% by weight of component E. 1 2. The environmentally friendly electric wire coating composition according to item 11 of the scope of patent application, wherein the content of maleic acid needles in component E accounts for 1 to 5% by weight of component E. 1 3. The environmentally friendly cable coating composition according to item 1 of the scope of patent application, wherein the content of polyethylene (PE) in component E accounts for 90 to 99.5% by weight of component E. 1 4. The environmentally friendly cable coating composition according to item 13 of the scope of patent application, wherein the content of polyethylene (PE) in component E accounts for 95 to 99% by weight of component E. Page 16 2002.11.15.016