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Flame-retardant thermoplastic resin composition

A thermoplastic resin and composition technology, applied in the field of electric wires and cables, as well as molded parts, and power cords, can solve the problems of reduced compatibility, reduced crystallinity, reduced rigidity, etc., and achieves excellent discoloration resistance and low smoke generation Effect

Inactive Publication Date: 2009-09-02
MITSUBISHI CHEM CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the most widely used phenolic antioxidants are affected by NOx gases, oxides, peroxides, oxidizing metals, alkalis, etc. in the atmosphere, and may undergo discoloration such as yellowing or pinking
On the other hand, metal hydroxides such as magnesium hydroxide or aluminum hydroxide contain oxidative metal impurities, so non-halogen flame-retardant thermoplastic resin compositions whose base polymer is polyolefin resin are used as insulation coating or armoring. Power cords, wires, cables, molded parts, etc. made of materials are prone to discoloration such as yellowing or pinking due to the influence of NOx gas, oxides, peroxides, oxidizing metals, alkalis, etc. in the atmosphere
[0005] (2) Polyolefin resins, especially high-pressure low-density polyethylene, ethylene-α-olefin copolymer, ethylene-vinyl acetate copolymer (EVA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methyl Methyl acrylate copolymer (EMMA) etc. have crystalline parts in the room temperature region, although the degree is different, and the rigidity is high
[0006] (3) In addition, when the filling amount of the metal hydrate is increased, the compatibility between the metal hydrate and the polymer molecule decreases, and the shear viscosity of the resin composition increases, so the torque during extrusion molding increases, The surface of the molded product loses its smoothness, so it is necessary to reduce the molding line speed during extrusion molding
[0007] (4) In order to reduce the rigidity, it is necessary to reduce the crystallinity of the polyolefin resin as the base polymer, but the production method of high-pressure polyethylene is limited in reducing the crystallinity
In addition, in the case of ethylene copolymers, if the content of the comonomer is increased, the crystallinity will be lowered and the softness will be reduced, but the mechanical strength of the resin composition will be lowered because the crystal part that contributes to maintaining the strength will decrease. and impairs its heat deformation resistance
[0008] (5) On the other hand, when the filling amount of the metal hydrate is reduced in order to improve the extrusion moldability and flexibility of the resin composition, the flame retardancy of the resin composition decreases
However, this resin composition is aimed at improving flexibility, mechanical properties, and whitening resistance against scratches, and there is no mention of preventing additives such as antioxidants from deteriorating due to metal hydroxides such as magnesium hydroxide or aluminum hydroxide. Technical issues and technical ideas such as discoloration of resin compositions (problem (1) above)

Method used

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  • Flame-retardant thermoplastic resin composition
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0053] Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited to the following examples unless the gist is exceeded. The raw materials and evaluation methods used in the following examples are as follows.

[0054]

[0055] (polyethylene resin):

[0056] (a1) Ethylene-α-olefin copolymer [density 0.898g / cm 3 , ethylene-1-hexene copolymer, "kernel (カ—ネル) KF360" manufactured by Nippon Polyethylene Co., Ltd.]

[0057] (a2) Ethylene-unsaturated ester copolymer ["Evaflex EV180" manufactured by Mitsui DuPont Polymer Chemical Co., Ltd.: Density 0.94 g / cm 3 , ethylene-vinyl acetate copolymer (containing vinyl acetate 33% by weight)]

[0058] (a3) Vinyl resins containing acid anhydride groups ["ADTEXL6101M" manufactured by Nippon Polyethylene Co., Ltd.: Density 0.92 g / cm 3 , LLDPE (maleic anhydride modified linear low density polyethylene) containing 0.2 wt% maleic anhydride groups]

[0059] (a4) Silane-graf...

manufacture example 1

[0094] Production example 1 [production of (a4) and (a5)]

[0095] Dissolve dicumyl peroxide (DCP) in vinylmethoxysilane, use two kinds of polyethylene resins (a1) and (a2) respectively, stir and mix with the composition ratio (parts by weight) of Table 1, Extrusion was performed at an extrusion temperature of 150 to 200° C. using a single-screw extruder with a diameter of 50 mm to obtain pellets (a4) and (a5). Each resin is sealed and packaged in an aluminum foil laminated bag, stored in a state of isolating external moisture, and taken out for use as needed.

[0096] [Table 1]

[0097] Material a4 a5 Vinylmethoxysilane 3 3 DCP 0.2 0.2 a1 100 - a2 - 100

Embodiment 1～6 and comparative example 1～5

[0099] Mixtures of the various formulations shown at the top of Tables 2 and 3 were made. Mixing is carried out with a kneader mixer, the kneading temperature is set at 180-230° C., and granulation is carried out after mixing. Table 2 and Table 3 show the evaluation results of each mixture.

[0100] [Table 2]

[0101]

[0102] [table 3]

[0103]

[0104] It can be seen from Table 2 and Table 3 that the materials shown in the examples exhibit good discoloration resistance, mechanical strength, heat resistance, flexibility, flame retardancy, end processability, damage whitening resistance and molding processability. On the other hand, none of the comparative examples could achieve the balance of the aforementioned properties.

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Abstract

Disclosed is a flame-retardant thermoplastic resin composition which maintains high flame retardancy without containing a halogen, and is free from problems of conventional non-halogen flame-retardant thermoplastic resin compositions. This flame-retardant thermoplastic resin composition is flexible and highly heat-resistant, while having good terminal workability, scratch whitening resistance, mechanical strength, moldability and excellent discoloration resistance. Specifically disclosed is a flame-retardant thermoplastic resin composition which is obtained by blending 50-300 parts by weight of a metal hydroxide (Y) per 100 parts by weight of a thermoplastic resin composition (X) containing 25-90% by weight of a polyethylene resin (a), 1-20% by weight of a polypropylene resin (b), 5-39% by weight of a styrene thermoplastic elastomer (c) and 4-40% by weight of a mineral oil-based rubber softener (d). This flame-retardant thermoplastic resin composition is characterized in that at least a part of the polyethylene resin (a) is composed of an ethylene-vinyl acetate copolymer (EVA), and the ethylene-vinyl acetate copolymer content is 40-80% by weight relative to 100% by weight of the thermoplastic resin composition (X).

Description

technical field [0001] The present invention relates to a flame retardant thermoplastic resin composition, in particular, to a flame retardant thermoplastic resin composition which is low in smoke even when burned, does not generate toxic gases such as hydrogen halide, and is excellent in discoloration resistance, and uses the Power cords, electric wires and cables, and molded parts (plugs, adapters, etc.) of resin compositions. Background technique [0002] In recent years, as part of countermeasures against environmental problems, non-halogen flame-retardant thermoplastic resin compositions that generate less smoke in the event of a fire and that do not generate harmful gases such as hydrogen halides, and power supplies using the resin compositions have been used. Formed parts such as wires, wires, cables, plugs, adapters, etc. [0003] These resin compositions mainly use polyolefin resin as the base polymer, and metal hydroxides such as magnesium hydroxide and aluminum h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/04C08K3/22C08L23/10C08L53/00C08L91/00H01B3/00H01B3/44H01B7/295
CPCC08L25/06H01B7/295C08L23/10H01B3/442C08L23/0853C08L2666/06C08L23/04C08L91/00H01B3/44
Inventor 神藤寿雄八木敬佑
Owner MITSUBISHI CHEM CORP
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