JPS6026047A - Flame-retardant polyolefin composition - Google Patents

Abstract

PURPOSE:To provide a polyolefin compsn. which is highly flame retardant and can be easily pelletized, by incorporating an inorg. ammonium salt, an aliph. bromine-contg. compd. contg. a triazine ring and antimony trioxide in a polyolefin. CONSTITUTION:35-90pts.wt. inorg. ammonium salt such as ammonium chloride or sulfate, 15-45pts.wt. aliph. bromine-contg. compd. contg. a triazine ring [e.g. tris(dibromopropyl) isocyanurate or bis(dibromopropyl) isocyanurate] and 5- 20pts.wt. antimony trioxide are incorporated in 100pts.wt. polyolefin such as polypropylene or polyethylene to obtain the desired flame-retardant polyolefin compsn. This compsn. is suitable for use in the production of electrical parts such as an outer frame for export TV sets, which require high flame retardance.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to polyolefin compositions having a high degree of flame retardancy.

Since polyolefins are composed of hydrocarbons, they have drawbacks such as easy ignition and combustibility, and therefore various proposals have been made to make polyolefins flame retardant.

In recent years, there has been a trend in which polyolefins used in electrical products and building materials are required to have a high degree of flame retardancy.

For example, under the U.S. UL standards, parts of electrical products such as the outer frame of televisions were previously allowed to have a flame retardancy of V-2, but now they have a higher flame retardancy of V-1 to V-0. 41 is required. Therefore, export products to the United States must have a flame retardancy of V-1 to V-0, and
Naturally, a higher degree of flame retardancy is required in Japan as well.
Ru.

Against this background, various attempts have been made to use organic flame retardants and inorganic flame retardants.

In general, organic flame retardants have self-extinguishing properties against polyolefins, but they have the disadvantage of causing overheating during combustion. In this respect, although inorganic flame retardants do not have a large effect and have self-extinguishing properties, when trying to impart a high flame retardant effect such as V-1 to V-O, A very large amount, for example 600 parts by weight per 100 parts by weight of polyolefin, must be incorporated.

Generally, it is preferable to mix 200 parts by weight with respect to 100 parts by weight of polyol/fin because it improves the rigidity and dimensional stability of molded products, but if the amount is as large as 300 parts by weight, This makes pelletizing extremely difficult and impractical. That is, when it is made into a molded product, the fluidity in the molding machine and the mold is reduced, and when it is made into a molded product, the W impact strength is reduced.

The inventors, without difficulty,
- As a result of various studies regarding the development of a polyolefin/fin composition having a high degree of flame retardancy equivalent to v-1 to j = v-o, we found that an inorganic ammonium salt, a specific organic flame retardant, and a By using antimony oxide, the results are 1! (2) et al. Jl, ζ), and have completed the present invention.

Invention V1, 35 to 90 parts by weight of 1-1 inorganic ammonium salt per 100 parts by weight of polyolefin.

1. Containing 15 to 45 parts of an aliphatic bromine compound having a tri-727 weight and 5 to 20 parts of antimony trioxide. This is a flame-retardant polyolefin composition.

The polyolefins used in the present invention include ethylene, propylene, butylene, etc.
Examples include copolymers of the α-olefin and other α-olefins, block copolymers, and mixtures thereof, and polyolefins containing polyzolopyrene as a main component are particularly preferably used.

Further, as the inorganic ammonium salt, any known inorganic ammonium salt can be used, such as ammonium chloride, ammonium bromide, ammonium sulfate, ammonium nitrate, ammonium phosphate, and ammonium carbonate, among others, ammonium chloride, ammonium sulfate, or ammonium bromide. is preferably used. For these inorganic ammonium salts, by using fine powder with a particle size of 0.1 to 50μ and a specific surface area of 30i/V or less, it is possible to improve impact resistance and have a good surface condition without silver streaks. Molded products can be obtained. In addition, the inorganic ammonium salt is sodium stearate in advance.

Surface treatment with a surfactant such as sodium lauryl sulfonate is preferred because it can improve the dispersibility and fluidity of the polyolefin.

The amount of inorganic ammonium salt blended in the present invention is 65 (5) to 90 parts by weight, preferably 1-7 parts by weight, per 100 parts by weight of the polyolefin. If the amount of the inorganic gamma ammonium salt is less than the above 35 parts, the sufficient sag prevention effect cannot be achieved, and even if it is greater than 90 parts, the effect is limited.
Rather, when producing polyolefin molded articles, cross-wire pelletization in an extruder becomes difficult, so it is not industrially suitable.

The present invention is characterized by the use of an aliphatic bromine compound having a triazine ring and antimony trioxide in combination with an inorganic ammonium salt. An aliphatic bromine compound having a triazine term is a compound in which a brominated aliphatic group is bonded (-) to the carbon or nitrogen of the triazine ring through an ether bond, ester bond, amide bond, etc., or directly. Bromine(6)-algyl cyanurates such as (sifurompropyl) cyanurate, bis(sifurompropyl) cyanurate, tris(tetrafurompentyl) cyanurate, his(tetrafurompentyl) cyanurate: Tris(dibromopropyl)
Brominated alkyl thiocyanurates such as thiocyanurate, bis(dibromopropyl)thiocyanurate, tris(tetrabromopentyl)thiocyanurate, bis(tetrabromopentyl)thiocyanurate; tris(dibromopropyl)in cyanurate.

Examples include brominated argylin cyanurates such as bis(dibromopropyl)in cyanurate-1. Among these, compounds having a bromine content of 55X or more are particularly preferably used.

In the present invention, it is extremely important to use a particularly selected aliphatic bromine compound having a triazine ring among the aliphatic bromine compounds known as flame retardants. That is, compounds that do not have a triazine ring even if they are aliphatic bromine compounds, such as tetrabrominated bisphenol A bis (tooled propyl ether), tetrabrominated dihydroxy diphenyl sulfone (tooled propyl nitride), Labromobutane, tribromopropane, etc. cause large increases and cannot be applied to the present invention.

The proportion of the aliphatic bromine compound having a tree of 127 parts according to the present invention is 15 to 45 parts by weight, preferably 1 to 40 parts by weight, per 100 parts by weight of the polyolefin. When the amount of bromine compound is less than 15 parts by weight, the self-extinguishing property is incomplete 3) and 1], and vice versa [45
If the amount is more than 11 parts by weight, the thermal decomposition effect of 11 becomes strong, and foaming, decomposition and coloration are likely to occur, and extrusion becomes difficult, so it is preferable. In addition, when blending 40 to 85 parts by weight of an inorganic ammonium salt per 100 parts by weight of polyolefin, it is recommended that the amount of the bromine compound be 30 parts by weight or more relative to the inorganic ammonium salt. In addition, antimony trioxide is preferably added in an amount of 5 to 2 parts per 100 parts by weight of the polyolefin.
It is preferable to blend part ii, especially 1 part of 9 to 16 parts, in order to impart a higher degree of flame retardation.

In the present invention, the order of mixing polyolefin, inorganic ammonium salt, aliphatic bromine compound having a triazine ring, and antimony trioxide is not particularly limited, and each component may be mixed simultaneously, or several components may be mixed in advance. The rest may be mixed later.

The mixing method is also not particularly limited, and may be carried out using a general tumbler blender, a type blender, a Henschel mixer, a ribbon mixer, or the like. Furthermore, it is also possible to adopt a method of changing the mixing order and equipment, such as mixing several types in advance in a Henschel mixer, then adding the rest and mixing in a tumbler blender.

The method of extrusion is also not particularly limited, and the composition of the present invention mixed in a predetermined ratio may be extruded at once.
Alternatively, a desired composition having a predetermined ratio may be obtained by mixing and pelletizing some of the components in advance and then mixing the remaining components.

The polyolefin composition of the present invention consists of (9) the polyolefin, an inorganic ammonium salt, an aliphatic bromine compound having a triazine ring, and antimony trioxide (1), but in addition to these components, Conventionally known stabilizers 1 Colorants, antistatic agents, lubricants, nucleating agents,
Various fillers, glasses, various coupling agents, etc. may be added.

The polyolefin composition of the present invention has extremely high flame retardancy, and has V-1 to V-0 according to the above-mentioned UL94 standard.
It is also possible to have a high degree of flame retardancy corresponding to . It is not clear why such flame retardancy is achieved.
Alternatively, it is presumed that the aliphatic bromine and the nitrogen of the triazine ring interact cooperatively with the inorganic ammonium salt and antimony trioxide to exhibit high flame retardancy. Moreover, the inorganic ammonium salt is
Since 5 to 90 parts by weight is blended, when molded products are produced, they have the advantage of good dimensional stability and high rigidity.

(lO) In order to explain the present invention more specifically, Examples and Comparative Examples will be described below, but the present invention is not limited to these Examples. The experimental results shown in Examples and Comparative Examples were conducted in accordance with the vertical method of the U L 94 standard, and the average self-extinguishing time and 10 burning test pieces were ignited twice each, that is, a total of 20 The average self-extinguishing time after ignition is shown. , and the maximum self-extinguishing time t was the maximum value during the self-extinguishing time after the 20 ignitions.

'Also, the extent to which the cotton under the test piece ignited due to "flame" from the test piece was expressed by how many out of 10 cotton strands were ignited. For example, if 3 out of 10 lights were ignited, 3710 would be displayed.

In addition, the shape of the test piece d: 5 inches x 0.5 inches x 1/8
I went in inches.

Example 1 Inorganic ammonium salt in the proportion shown in Table 1 based on 100 parts by weight of polypropylene (#1 ME240 manufactured by Sansoda Co., Ltd.),
An aliphatic bromine compound having a triazine ring, antimony trioxide, and a heat stabilizer were mixed in a Super Mixer (manufactured by Yoda Seisakusho). In addition, the heat stabilizer is 2,6-sheet tθrt
-Butyl-4-methylphenol, dilaurylthiopropionate, and calcium stearate in the total composition, respectively, KO, IN, and 0.2N.

and [1- was added so that it became 1.1%. Next, an extruded rock with a kneader (manufactured by Nakatani Machinery Co., Ltd.) is melt-kneaded,
Pelleted. The pellets were molded using a 1.5 oz injection molding machine (manufactured by Kawa [1-Churchill)] using a kumquat to obtain a test piece. Using this test piece, a combustion test ((JL Standard S
B 94 vertical method) was conducted to measure the average and maximum self-extinguishing times and the cotton ignition rate, and these values are also listed in Table 1.

Claims (1)

[Claims] 1) 100 parts by weight of polyolefin, 55 to 90 parts by weight of an inorganic ammonium salt, 15 to 45 parts by weight of an aliphatic bromine compound having a triazine ring, and 5 to 2 parts by weight of antimony trioxide.
Flame-retardant polyolefin composition 2 containing 0 parts by weight
3) The composition according to claim 1, wherein the polyolefin is polypropylene. 3) The inorganic ammonium salt is ammonium chloride. 4) The composition according to claim 1, which is at least one selected from ammonium bromide and ammonium sulfate. 4) The aliphatic bromine compound having a triazine ring is an ester of incyanuric acid and a brominated aliphatic alcohol. Composition 5) The aliphatic bromine compound having a triazine ring is composed of tris(
The composition according to claim 1, which is diprombu 1 pill) incyanurate.