JPS62167339A - Flame-retardant resin composition - Google Patents

Abstract

PURPOSE:The titled composition preventing drip in combustion, causing neither halogenous corrosive properties nor poisonous gas, having improved processing properties, obtained by blending an '-olefin (co)polymer having specific gravity with a specific amount of magnesium hydroxide subjected to surface treatment. CONSTITUTION:100pts.wt. alpha-olefin (co)polymer (e.g., polyethylene, crystalline propylene-ethylene block copolymer, etc.,) having <=0.92 gravity is blended with 50-250pts.wt. magnesium hydroxide subjected to surface treatment with one or more of a silane coupling agent, a silicone derivative or a fatty acid (metallic salt).

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention has excellent flame retardancy, prevents dripping during combustion, is non-halogen-based, corrosive, does not generate harmful gases, and has well-balanced mechanical properties. Furthermore, the present invention relates to an olefin-based flame retardant resin composition using an α-olefin homopolymer or copolymer thereof having a density of 0.92 or less and having excellent extrusion processability.

[Prior art]

Conventionally, flame retardancy has been achieved in polyolefin compositions, which are often used as insulating materials for electric wires, cables, and other electrical appliances, by adding halogen compounds and antimony trioxide to polyolefins. However, these compositions are halogenated compounds and emit halogenated gas when burned, which is harmful to the human body and corrodes the entire bend, which is not desirable.

On the other hand, in conventional flame retardant compositions, flame retardancy is achieved by non-halogenated hydrated metal compounds, but the base resin is crystalline as seen in Patent No. 1231199 @. In addition to olefin monopolymer resins, there are many that list thermoplastic resins such as polystyrene, ABS, and nylon, and when these resins are burned, they generate styrene and amide resins, which are non-halogen, but emit a considerable amount of harmful gas. The area where one hand fell off was seen.

Furthermore, as seen in the above-mentioned Patent No. 1231199, self-extinguishing resin compositions mainly consisting of thermoplastic resin, magnesium hydroxide, and carbon powder to improve flame retardancy can be used for some applications, especially for insulation of communication lines. Lines, jackets, and the like are limited to multiple colors, for example, eight colors, and some compositions that aim to improve flame retardancy using carbon powder are completely unsuitable for actual use.

[Purpose of the invention]

The present invention has been made in consideration of the above circumstances, and its purpose is to provide a gas that is highly safe to the human body in the event of a fire, does not corrode surrounding metals, and is a non-halogen gas. It is a clean and non-polluting system that does not emit any harmful gases.

That is, the present invention excludes resins that generate harmful gases such as polystyrene, ABS, and nylon, and uses α-olefin homopolymers and α-olefin copolymers, and carbon powder such as carbon black. It is not intended for use, and can be freely colored according to the purpose, and furthermore, it uses a low-crystalline flexible material with a resin density of 0.92 or less, and one or more types of silane coupling. By using magnesium hydroxide that has been surface-treated with a chemical agent, it has excellent flexibility, low-temperature properties, and processability even when filled with a large amount of hydrated metal, and is flame retardant compared to the conventional addition of carbon powder. The object of the present invention is to provide a flame-retardant resin composition that can be filled with a large amount of a hydrated metal compound that has a superior performance effect.

[Structure of the invention]

The flame-retardant resin compositions of the present invention are characterized in that they do not contain any halogen elements, do not generate any harmful gases even when burned, and are easy to freely color the resin composition. It's something.

(1) The α-olefin homopolymer or copolymer used in the present invention is an α-olefin such as ethylene or propylene.
Homopolymers of olefins or α-olefins and other α-olefins
- crystalline block or random copolymers with olefins, such as crystalline propylene-ethylene block copolymers, ethylene-butene-1 random copolymers, propylene-butene-1 random copolymers, or α-olefins; copolymers (including graft copolymers) with polar monomers such as vinyl acetate, maleic anhydride, and acrylic acid, and mixtures thereof, whose specific gravity is 0.
92 or less.

Combinations of these mixtures can be made depending on various requirements such as improving the surface hardness, cold resistance, stress cracking resistance, and adhesion of the resin composition, and any combination can be easily kneaded and melted.

(2) Magnesium hydroxide used in the present invention is a silane coupling agent silicone derivative or a fatty acid,
Use one that has been surface-treated with a fatty acid metal salt.

(i) A silane coupling agent has a reactive group (methoxy group, ethoxy group, carboxyl group, cellosolve group, etc.) that reacts with an inorganic substance at one end of the molecule, and this generally has a trifunctional group. However, it is of course also possible to have trifunctional or -functional functional groups. In addition, the other end has a reactive group (vinyl group, epoxy group, methacrylic group, amino group, mercapto group, etc.) that chemically bonds with the resin side of the organic material, and the main chain has a flukoxy oligomer skeleton. It is something to do.

(11) The silicone derivative is a type in which a part of the methyl group of dimethylpolysiloxane is substituted with various organic groups, and the various modified organic groups include α-methylstyrene group, α-olefin group, and polyether group. , compatibility with alcohol groups, fluoroalkyl groups, hydrophilicity, lubricity,
Modified groups for the purpose of improving water repellency, etc., modified groups for the purpose of reactivity and adsorption such as amine groups, mercapuru groups, epoxy groups, carboxyl groups, mold release substituted with higher fatty acids, carbana, and amide; Silicone modified derivatives introduced by substitution with a wide variety of modified groups, including modified groups for the purpose of polishing, highly reactive modified types with methacryloxypropyl groups, and reactive types with OH groups and NH2 groups at the terminals. can be given.

(iii) Fatty acids include saturated and unsaturated fatty acids, and refers to fatty acids with carbon numbers of 6 to 22, especially 01
Examples include stearic acid and oleic acid.

(iv) Fatty acid metal salts include metal soaps in which the above-mentioned fatty acids are bonded to metals, particularly sodium stearate,
Examples include potassium oleate.

Of course, fatty acids with a side chain bonded to a metal are also effective, regardless of whether they are linear saturated or unsaturated.

Magnesium hydroxide surface-treated by the above (i) to (iV) or a mixture thereof, from 50 to 2
When used continuously at 50 parts by weight, it is compatible with or reacts with low-density, low-crystalline polymers, and can easily form flame-retardant compositions with excellent low-temperature properties, flexibility, and processability even when highly loaded. However, if the amount is less than 50 parts by weight, the flame retardant effect will be significantly reduced. In addition, at 250 parts by weight or more,
It has been confirmed that although flame retardancy is significantly improved, mechanical properties such as flexibility and low-temperature properties are reduced, and workability is extremely poor.

(3) Other additives The flame retardant resin composition of the present invention may contain antioxidants, neutralizers, ultraviolet absorbers, antistatic agents, pigments, dispersants, lubricants, thickeners, etc., if desired. can be blended.

(4) Surface treatment method A stirring machine such as a Henschel mixer or a blender is sufficient for the treatment method, and no special equipment is required, although the length of stirring time for treatment may vary depending on the model.

It is necessary to use a different method of addition depending on how the processing agent is used, such as a dripping method or a bulk addition method.

Further, depending on the properties of the processing agent, it may be used after being diluted with water or an alcohol solvent.

It can also be processed in the magnesium hydroxide production line process. This is done in the production line process, where the magnesium hydroxide is produced in the form of a slurry, and at this time, the surface treatment agent can be added all at once, sufficiently stirred, and the drying process can of course be carried out.

(5) Mixing and kneading method These components are individually measured and mixed, and conventional equipment and methods for rubber plastics can be used, and no special equipment is required. That is, each component is sufficiently mixed and dispersed using a mixer such as a ribbon blender or a Henschel mixer, and then kneaded using a melt mixer such as a panburi roll or an extruder to obtain the desired product.

(6) Molding is performed mainly by injection molding, extrusion molding, etc., to form the pellets obtained in (5) into specific shapes, mainly box-shaped storage cases, joints, tape shapes, tube shapes, etc. Can be molded using molds and dies.

〔Effect of the invention〕

The present invention does not use resins that generate harmful gases such as polystyrene, ABS, and nylon, but uses low-crystalline α-olefin polymers and α-olefin copolymers with a density of 0.92 or less. Possibly also one or more silane coupling agents, silicone derivatives or fatty acids,
By using magnesium hydroxide whose surface has been treated with fatty acid metal salts, it is possible to charge a large amount of magnesium hydroxide, and it can be used in various ways depending on the purpose, without using carbon powder such as carbon black to improve combustion. It is possible to provide a flame-retardant composition that is flame-retardant and can be colored, is extremely flexible, and has excellent low-temperature properties and processability.

〔Example〕

This will be explained below by giving examples.

Each of the flame-retardant mixtures of Examples 1 to 7 was blended according to Table 1 below, and melt-kneaded using a panburi roll to obtain the desired product. In addition, the surface treatment of magnesium hydroxide was carried out by adding a treating agent and performing high-speed treatment for 30 minutes in a super mixer. Next, the tube extrusion processability, embrittlement temperature, harmful gas components, elongation, thermal deformation rate, and combustibility were investigated.

These results are shown in Table 1.

Claims (2)

[Claims] (1) For 100 parts by weight of an α-olefin homopolymer or α-olefin copolymer resin having a density of 0.92 or less, (2) An olefin flame-retardant resin composition containing 50 to 250 parts by weight of magnesium hydroxide surface-treated with one or more silane coupling agents, silicone derivatives, fatty acids, or fatty acid metal salts.