JPH0593108A - Flame-retardant resin composition - Google Patents

Abstract

PURPOSE:To prepare the title compsn. which generates no halogen gas on burn ing, is flame-retardant flexible, and has a remarkably improve abrasion resis tance by compounding three specific resins and a hydrated metal compd. in a specified ratio. CONSTITUTION:The title compsn. is prepd. by compounding 100 pts.wt. the sum of 97-50 pts.wt. at least one resin (A) selected from the group consisting of an ethylene-alpha-olefin copolymer and an ethylene-ethyl(or methyl) (meth)acrylate copolymer and 3-50 pts.wt. polyamid resin (B), 0.1-30 pts.wt. at least one resin (C) selected from the group consisting of an ethylene-glycidyl methacrylate copolymer, an ethylene-ethyl acrylate-maleic anhydride copolymer, a silane deriv. of an ethylene-acrylic ester copolymer, polymethyl methacrylate, and a carboxylated acrylic resin, and 50-300 pts.wt. hydrated metal compd. (e.g. aluminum hydroxide) (D).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended to be applied to coatings of electric wires and cables, hoses, sheets, injection products, etc., which do not generate harmful and corrosive halogen-based gas even when burned by a fire. And a flame-retardant resin composition.

[0002]

2. Description of the Related Art Conventionally, in order to impart flame retardancy to a polyolefin composition which has been widely used for coating electric wires and cables, hoses, sheets and injection products, a halogen compound and antimony trioxide are added to the polyolefin. It was achieved by adding. However, these compositions are halogen compositions, which are not preferable because they generate a halogen-based gas when burned, which is harmful to the human body and corrodes metals. Also, due to the large amount of smoke emitted and poor visibility, evacuation and extinguishing activities of people during a fire were significantly limited.

In particular, recently, from the viewpoint of safety, it has been strongly demanded that such a halogen-based gas should not be generated. In view of such circumstances, attention has been paid to inorganic flame retardants that use hydrated metal compounds that emit extremely little smoke and are less harmful. In recent years, resin composites containing magnesium hydroxide, aluminum hydroxide and the like have been put to practical use in order to impart flame retardancy, but actually, in order to obtain flame retardancy, these hydrated metal compounds are used. Since it is necessary to fill a large amount, there is a problem that the surface is easily scratched and the surface is easily worn by friction.

In order to solve the above problems and to improve the compatibility between the resin and the inorganic substance, a method of adding an olefinic silane graftmer, a method of adding a dicarboxylic acid derivative or a dicarboxylic acid anhydride derivative,
Alternatively, a method of adding a silicone composition in order to impart surface activity to the composition, a method of bleeding a wax or a surfactant on the surface, and the like have been proposed. Was not enough in the required field.

[0005]

DISCLOSURE OF THE INVENTION The present invention does not generate harmful halogen-based gas upon combustion, does not lose the high flame retardancy obtained by adding a hydrated metal compound, and is flexible. The purpose of the present invention is to provide a flame-retardant resin composition that retains the above and has significantly improved abrasion resistance.

[0006]

The flame-retardant resin composition of the present invention is a composition comprising the following components (a) to (d):
(a) + (b) 100 parts by weight (however, (a) :( b) = 97: 3-5)
0:50), 0.1 to 30 parts by weight of (c) and (d)
Is contained in an amount of 50 to 300 parts by weight. (a) one or more resins selected from a copolymer of ethylene and α-olefin, an ethylene-ethyl acrylate copolymer resin or an ethylene-methyl methacrylate copolymer resin, (b) a polyamide resin, ( c) selected from ethylene-glycidyl methyl acrylate copolymer resin, ethylene-ethyl acrylate-maleic anhydride copolymer resin, silane derivative of ethylene-acrylic ester copolymer resin, polymethyl methacrylate or carboxylic acid derivative of acrylic resin One or more kinds of resins described above, and (d) a hydrated metal compound.

The component (a) of the present invention is added for the purpose of preventing the deterioration of properties caused when a large amount of a hydrated metal compound is filled. Examples of the α-olefin of the copolymer of ethylene and α-olefin used in the present invention include C _{3 to} C ₁₂ such as propylene, butene-1,
Pentene-1, hexene-1, heptene-1, octene-1, 4-methylpentene-1, 4-methylhexene-
1,4,4-dimethylpentene-1, nonene-1, decene-1, undecene-1, and dodecene-1, etc., and these resins and ethylene-ethyl acrylate copolymer resin or ethylene-methyl methacrylate copolymer resin. One or more resins selected from the above are used.

The component (b) of the present invention is added for the purpose of improving the wear resistance of the composition. The polyamide resin used in the present invention includes nylon-4, nylon-6,
Nylon-11, Nylon-12, Nylon-6,6,
Nylon-6,10, Nylon 6,12, Nylon 1
1,6 and a copolymer of nylon-6 and nylon-6,6 and the like. If the amount of these components added is 3% by weight or less with respect to the component (a), it is difficult to obtain the desired effect of improving wear resistance, and if it is 50% by weight or more, flexibility and flame retardancy are deteriorated. Is not practical because it becomes expensive.

The component (c) used in the present invention is added to improve the compatibility between the polyamide resin and the resin represented by the component (a) and the compatibility with the hydrated metal compound. Examples of the acrylic ester of the silane derivative of the ethylene-acrylic ester copolymer resin used in the present invention include ethyl acrylate, methyl acrylate, methyl methacrylate, and the like, and the silane compound includes vinyltrimethoxysilane and vinyltrimethoxysilane. Examples thereof include ethoxysilane, vinyltributoxysilane, allyltrimethoxysilane, and allyltriethoxysilane. Further, as the acrylic resin of the carboxylic acid derivative of the acrylic resin, polymethylmethacrylate,
Ethylene-methyl methacrylate copolymer, ethylene-
Examples thereof include methyl acrylate copolymers and ethylene-ethyl acrylate copolymers, and examples of carboxylic acids include acrylic acid, methacrylic acid, fumaric acid, maleic anhydride, and itaconic acid. The amount of these added is 0.1 with respect to 100 parts by weight of the component (a) + the component (b).
If it is less than 1 part by weight, the compatibility between the polyamide resin and the other additives is poor, so that the mechanical properties, especially the elongation are poor. On the other hand, when the amount is 30 parts by weight or more, no remarkable effect exceeding the improving effect of the present invention is exhibited and the product becomes expensive, which is not practical.

The hydrated metal compound used in the present invention has a decomposition initiation temperature in the range of 150 to 450 ° C.,
A compound represented by the general formula M _m O _n · XH ₂ O (where M is a metal, m and n are integers of 1 or more determined by the valence of the metal, and X is a number of contained waters of crystallization), or a compound represented by the formula It is a double salt containing, specifically, aluminum hydroxide (Al ₂ O ₃ .3H ₂ O;
Or Al (OH) ₃ ), magnesium hydroxide (MgO · H ₂ O; or Mg (OH) ₂ ), calcium hydroxide (CaO · H ₂ O; or
Ca (OH) ₂ ), barium hydroxide (BaO ・ H ₂ O; or BaO ・ 9
H ₂ O), zirconium oxide hydrate (ZrO ・ nH ₂ 0), tin oxide hydrate (SnO ・ H ₂ 0), basic magnesium carbonate (3MgC
_{O 3 · Mg (OH) 2} · 3H 2 O), hydrotalcite (6MgO · Al ₂
O ₃ · H ₂ O), dawsonite (Na ₂ CO ₃ · Al ₂ O ₃ · nH ₂ O), borax (Na ₂ O · B ₂ O ₅ · 5H ₂ O), zinc borate (ZnB ₄ O ₇ · 2ZnO)
Etc. As for the amount of addition of these components, if the amount is 50 parts by weight or less relative to 100 parts by weight of the component (a) + the component (b), it is difficult to obtain the desired flame retardant effect. And the extrusion processability deteriorates.

As other additives, the flame-retardant composition of the present invention may optionally contain additives usually used, for example, antioxidants, neutralizing agents, ultraviolet absorbers, antistatic agents, pigments, dispersants, lubricants. Materials, thickeners, foaming agents, metal deterioration inhibitors, antifungal agents, flow regulators, etc., flame retardants of phosphorus and phosphine derivatives, other inorganic fillers, crosslinking agents, crosslinking aids, etc., or other synthetic materials A resin can also be included. It is also possible to carry out electron beam irradiation for crosslinking.

[0012]

EXAMPLES Examples will be described below. Each component was kneaded at an extrusion temperature of 200 to 240 ° C. by using a different-direction twin-screw extruder according to the blending ratio as shown in Table 1, and granulated. The obtained composition was roll-pressed to prepare various measurement test pieces. Using this test piece, tensile breaking elongation, oxygen index and wear test were carried out. Also, depending on the extruder, the outer diameter is 20 mmφ and the inner diameter is
A tube having a diameter of 18 mm and a thickness of 1 mm was extruded to evaluate the extrudability.

[0013]

[Table 1]

(1) Nippon Petrochemical Softlex (ethylene-α-olefin copolymer) (2) Nippon Petrochemical Lexulon (ethylene-ethyl acrylate copolymer) (3) Sumitomo Chemical low density polyethylene ( 4) Sumitomo Chemical Co., Ltd. ethylene-glycidyl methyl acrylate copolymer (5) Sumitomo Chemical Co., Ltd. ethylene-ethyl acrylate-maleic anhydride copolymer (6) ROHM & HAAS acrylic resin carboxylic acid derivative (7) Kureha Chemical Industry Polymethyl Methacrylate (8) Mitsui DuPont Polychemical Silane Derivative of Ethylene-Ethyl Acrylate Copolymer Resin (9) Showa Denko Heidilite H42M (10) Kyowa Chemical Kisuma 5B (11) Sanyo Chemical Industries Sun Wax 171P 1.0 parts by weight Ciba Geigy Irganox 1076 0.3 parts by weight and Sumitomo Chemical Sumilizer WXR 0.3 parts by weight Material (12) Pigment Black: VALCAN 9A-32 3.0 parts by weight (13) According to JIS K6760. (14) According to JIS K7201. (15) Worn wheel CS-10, load 500g, 1000 rotations. (16) 50mmφ single screw extruder 160-165-170-180 ℃ L / D: 25
Compression ratio 3.5 Tube extrusion Outer diameter 20 mmφ, Inner diameter 18 mmφ Evaluation Excellent>Good>Acceptable> Impossible, in order of acceptable level.

As is clear from Table 1, the materials shown in Examples 1 to 4 maintain flame retardancy, exhibit good wear resistance by the addition of the polyamide resin, and form the phase of the polymer and the hydrated metal compound. It has very good solubility and shows very good workability and elongation at break. On the other hand, in Comparative Example 1, since no polyamide resin was added, wear resistance was poor, and in Comparative Example 2 in which the amount of polyamide resin added was large, the flexibility was poor and the elongation at break value was also significantly reduced. In Comparative Example 3 in which the component (c) as the compatibilizer was not added, the elongation at break value was significantly reduced. Further, in Comparative Example 4 in which the addition amount of the hydrated metal compound is small, the flame retardancy is poor, and in Comparative Example 5 in which the addition amount of the hydrated metal compound exceeds 300 parts by weight, the workability is poor.

[0016]

As described above, according to the present invention,
It is possible to obtain a resin composition which does not generate a harmful halogen-based gas at the time of combustion, retains a high degree of flame retardancy and flexibility, and has significantly improved abrasion resistance.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical indication H01B 3/44 P 9059-5G // H01B 7/34 B 7244-5G

Claims (1)

[Claims] 1. A composition comprising the following components (a) to (d), wherein (a) + (b) 100 parts by weight (where (a) :( b) =
97: 3 to 50:50), 0.1 to 30 parts by weight of (c) and 50 to 300 parts by weight of (d) are contained in the flame-retardant resin composition. (a) one or more resins selected from a copolymer of ethylene and α-olefin, an ethylene-ethyl acrylate copolymer resin or an ethylene-methyl methacrylate copolymer resin, (b) a polyamide resin, c) selected from ethylene-glycidyl methyl acrylate copolymer resin, ethylene-ethyl acrylate-maleic anhydride copolymer resin, silane derivative of ethylene-acrylic ester copolymer resin, polymethyl methacrylate or carboxylic acid derivative of acrylic resin One or more kinds of resins, and (d) a hydrated metal compound.