JP2865384B2 - Flame retardant cylindrical extruded product - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a cylindrical extruded product such as an industrial robot having excellent flame retardancy and flexibility. More specifically, the present invention relates to a tube material (cylindrical extruded product) such as an industrial robot having excellent flame retardancy and flexibility, which is mainly composed of a special chlorinated polyethylene and a special polyamide resin.

[Prior Art] Industrial robots such as welding robots and assembly robots use compressed air, oil, water, etc. for operation control. Tubes and hoses made of soft nylon (polyamide resin) are widely used for transporting these fluids.

[Problems to be solved by the invention]

However, since these hoses and tubes are ignited by sticks or electric sparks at the time of welding, there is a high risk of flame, and flame retardancy has been strongly desired.

As a method of flame retardation of a polyamide resin, a method of adding an organic compound containing a halogen such as chlorine or bromine in the same manner as a general plastic or a polyamide to which a triazine compound such as melamine, siataric acid, and melamine cyanurate are added There are methods specific to resins.

However, among the polyamide resins, soft nylons such as nylon-11, nylon-6 and nylon-12 have the following problems in terms of flame retardancy.

(1) Decrease in mechanical strength due to addition of flame retardant (2) Bleed of added (blended) flame retardant (3) Drip phenomenon during combustion (4) Material by extraction or transfer of flame retardant (5) Buckling due to bending of tube or hose due to addition of flame retardant From the above, the present invention does not have these disadvantages (problems), that is, it has good flame retardancy and flame retardancy. An object of the present invention is to obtain a tube or a hose having excellent flexibility without bleeding of an agent.

[Means and actions for solving the problem]

According to the present invention, these problems are as follows: (A) The heat of crystal fusion measured by a differential scanning calorimeter is 5 cal / g
A chlorinated polyethylene having a Mooney viscosity of 20 or more under the conditions of MS _{1 + 4} and 100 ° C., (B) a polyamide resin that melts at a temperature of 210 ° C., (C) a plasticizer of the polyamide resin, D) a halogen-containing organic flame retardant and (E) a metal oxide flame retardant, wherein the composition ratio of the plasticizer in the total amount of the polyamide resin and the plasticizer is 1.0 to 30% by weight. ,
The composition ratio of chlorinated polyethylene in the total amount of chlorinated polyethylene, polyamide resin and its plasticizer is 5.
0 to 50% by weight, and the composition ratio of the halogen-containing organic flame retardant and the metal oxide-based flame retardant to 100 parts by weight of the total amount of the chlorinated polyethylene, polyamide resin and plasticizer is 1.0 as the total amount thereof. To 50 parts by weight, but the composition ratio of the halogen-containing organic flame retardant and the metal oxide-based flame retardant auxiliary is at least 0.5 part by weight. Can be. Hereinafter, the present invention will be described specifically.

(A) Chlorinated polyethylene Chlorinated polyethylene used in the present invention is obtained by chlorinating polyethylene powder or particles in an aqueous suspension or chlorinating polyethylene dissolved in an organic solvent. Yes (preferably obtained by chlorination in aqueous suspension). Generally, it is an amorphous chlorinated polyethylene having a chlorine content of 25 to 45% by weight, particularly preferably an amorphous chlorinated polyethylene having a chlorine content of 27 to 45% by weight.

The polyethylene is obtained by homopolymerizing ethylene or copolymerizing ethylene with at most 20% by weight of an α-olefin (generally, having at most 12 carbon atoms). Its density is generally 0.910-0.970g /
cc. Also, its molecular weight is at least 30,000,
Particularly, 50,000 to 700,000 is preferable.

Differential scanning calorimeter [Differenti
al Scanning Calorimeter, hereinafter referred to as “DSC”] is 5 cal / g or less, preferably 3 cal / g or less, and particularly preferably 1 cal / g or less. When chlorinated polyethylene with a heat of crystal fusion of more than 5 cal / g as measured by DSC is mixed with the polyamide resin described below, sufficient mixing cannot be achieved and the product obtained by extrusion (cylindrical extrusion) (Molded product) is not preferable because a peeling phenomenon and a buckling phenomenon occur.

Further, the Mooney viscosity of the chlorinated polyethylene is MS _{1 + 4}
And 20 or more at 100 ° C., preferably 30 to 120, and particularly preferably 40 to 100. Mooney viscosity is 20
It is not preferable to use a chlorinated polyethylene of less than 10% because the mechanical strength of the base material itself becomes insufficient and the buckling phenomenon of the tube easily occurs.

(B) Polyamide resin The polyamide resin used in the present invention comprises 21
It melts at a temperature of 0 ° C. 210 ° C
If a polyamide resin that does not melt at the temperature of the above is used, kneading to produce the composition at a temperature at which the polyamide resin melts, or attempting to mold the composition, the chlorinated polyethylene in the composition becomes hot. Decompose. On the other hand, when chlorinated polyethylene attempts to knead or mold by thermal decomposition, the polyamide resin does not melt.

The polyamide resin generally has a heat of crystal fusion measured by a differential scanning calorimeter of less than 2 cal / g. Heat of crystal fusion is 2c
If it exceeds al / g, the melting point of the amide resin is high.

The polyamide resin includes, as an acid, adipic acid, sebacic acid, ω-aminoundecanoic acid, ω-aminododecanoic acid, azelaic acid, terephthalic acid, isophthalic acid, cyclohexane-1,4-dicarboxylic acid, and the like. , 6-Hexamethylenediamine, trimethyl-1,6-
Hexamethylenediamine, 4,4'-diamino-dicyclohexylenemethane, 4,4'-diamino-3,3'-dimethyldicyclo-hexylenemethane, 4,4'-diamino-dicyclohexylenepropane, isophoronediamine , And lactams, caprolactam, laurolactam, ω
-Laurolactam, and further as isocyanate, 4,
It is obtained by polycondensing 4'-diphenylmethane diisocyanate and tolylene diisocyanate.
This polyamide resin is produced by subjecting these polycondensation components to melt polymerization and solution polymerization, respectively. The solution polymerization method is basically a pressure melt polymerization method as in the case of ordinary production of nylon-6 or nylon-66, but in the case of the polyamide resin, an aromatic dicarboxylic acid is used as a raw material dicarboxylic acid. In addition, since the polymerization temperature is relatively high, there is a problem that the polymer formed during the melt polymerization tends to be colored or gelled. Therefore, a phosphorus-based compound is added at the time of polymerization to prevent coloring and gelation, and various processes such as performing a two-stage polymerization consisting of a pre-condensation step and a post-condensation step using terephthalic acid diester as a starting material, and the like. It is desirable to devise.

Further, as the solution polymerization method, a decarboxylation condensation reaction between diisocyanate and dicarboxylic acid may be used.

(C) Plasticizer Further, the plasticizer used in the present invention is described in the “Polyamide Resin Handbook” described below, and is generally used by being widely added to polyamide resins, and includes higher alcohols and hydroxybenzoic acid. It is roughly classified into esters, aromatic sulfonamides and phenols. Representative examples of higher alcohols include hexylene glycol and glycerin. Representative examples of hydroxybenzoic acid esters include 2-ethylhexyl p-oxybenzoate and heptyl p-oxybenzoate. Further, typical examples of aromatic sulfonamides include N-methylbenzenesulfonamide, N-butylbenzenesulfonamide, p-toluenesulfonamide, N-ethyl-p-toluenesulfonamide and N-cyclohexyl-p-toluene. Sulfonamides. Examples of phenols include p-naphthol and dibenzylphenol octyl cresol.

Lubricant (release agent) commonly used for polyamide resin (nylon) in producing the tube material of the present invention
May be further compounded (added).

(D) Lubricants The lubricants are broadly classified into carboxylic acids, amides, carboxylic esters, carboxylic metal salts, alcohols and waxes. Carboxylic acids include stearic acid, palmitic acid and montanic acid. Examples of the amide include ethylene bisallylamide and methylenebisallylamide. Further, as the carboxylic acid esters, octyl stearate,
Glycerides stearic acid and montanic acid esters are included. Examples of the metal carboxylate include a calcium salt, an aluminum salt and a barium salt of stearic acid, and a partially saponified calcium salt of a montanic acid ester. Further, alcohols include stearyl alcohol, and waxes include polyethylene wax and polyethylene oxide.

The plasticizer and the lubricant have a melting point of 40 ° C. or less (preferably 30 ° C.), depending on the type of polyamide resin and chlorinated polyethylene used, the kneading temperature and the molding conditions.
C. or less). Further, those having a boiling point of 200 ° C. or more (preferably 250 ° C. or more) are desirable.

For the polyamide resin, plasticizer and lubricant,
This is described in detail in Osamu Fukumoto, "Polyamide Resin Handbook" (Nikkan Kogyo Shimbun, published on January 30, 1988).

(E) Halogen-containing organic flame retardant The halogen-containing organic flame retardant used in the present invention is generally widely used as a flame retardant in the field of synthetic resins and rubbers. Representative examples are tetrachlorophthalic anhydride, chlorinated paraffin, chlorinated bisphenol A, brominated bisphenol S, chlorinated diphenyl, brominated diphenyl, chlorinated naphthalene, tris (β-chloroethyl) phosphate and tris (dibromobutyl) Phosphates.

(F) Metal oxide-based flame retardant auxiliary The metal oxide-based flame retardant auxiliary used in the present invention is widely used as a flame retardant auxiliary in the field of synthetic resins and rubbers. Representative examples include antimony trioxide, antimony pentoxide, stannic oxide, zinc oxide and molybdenum oxide.

In producing the tube material of the present invention, in order to prevent the dehydrochlorination of chlorinated polyethylene, and further to prevent the chlorinated polyethylene and polyamide resin from deteriorating to oxygen and heat, a dehydrochlorination inhibitor, phenolic It is desirable to add an antioxidant, a thiopropionate antioxidant and an organic phosphorus antioxidant.

(G) Dehydrochlorinating inhibitor The dehydrochlorinating inhibitor is generally used to prevent a polymer containing a halogen atom (mainly a chlorine atom), such as a vinyl chloride polymer, from being dehydrochlorinated due to heat or the like. It is widely used. The dehydrochlorination inhibitor is roughly classified into metal soap, organotin compound and pure organic compound. Representative examples thereof are described in Japanese Patent Application No. 59-136526. These dehydrochlorination inhibitors are available from Rubber Digest, Inc.
(Published by Rubber Digest Co., Ltd., 1974) at pages 266 to 319. Of these dehydrochlorination inhibitors, inorganic acid salts, metal oxides and organotin compounds are preferred, and dibutyltin maleate and dibutyltin mercapto are particularly preferred.

(H) Phenolic antioxidants Phenolic antioxidants are generally used as antioxidants for organic substances such as synthetic resins. Among the phenolic antioxidants, the general formula of a representative one is represented by the following formulas (formulas (I) to (IV)).

[Hereinafter referred to as "phenolic compound (1)"] [Hereinafter referred to as "phenolic compound (2)"] [Hereinafter referred to as "phenolic compound (3)"] [Hereinafter referred to as “phenolic compound (4)”] However, R ₁ , R ₂ and R ₃ may be the same or different, and include a hydrogen atom or an alkyl group having 1 to 20 carbon atoms and 4 to 20 carbon atoms. Carbon, a 1-alkylcycloalkyl group having an alkyl group having 1 to 20 carbon atoms, and a 1-alkylbenzyl group having an alkyl group having 1 to 20 carbon atoms. A hydrogen group,
At least two of R ₁ , R ₂ and R ₃ are the hydrocarbon groups, R ₄ is an alkyl group having 1 to 6 carbon atoms, and R ₅
And R ₆ may be the same or different and are a hydrogen atom, the above-mentioned hydrocarbon group or an aralkyl group having 7 to 20 carbon atoms or an alkoxy group having 1 to 20 carbon atoms, and R ₅ and R ₆
Among them, at least one is the hydrocarbon group or the aralkyl group, R ₇ and R ₈ may be the same or different, and a hydrogen atom or an alkyl group having 1 to 12 carbon atoms;
Cycloalkyl group having 4 to 12 carbon atoms, 6 to 12 carbon atoms
1-alkylcycloalkyl group having 1 aryl group or alkyl group having 1 to 12 carbon atoms or 1
R ₉ is an alkylidene group or an alkylene group having 1 to 12 carbon atoms, x is 1 to 6
And y is 1, 2 or 3.

A typical example of the phenolic compound (1) is described in JP-A-49-45.
No. 051 is described in each specification. Among the phenolic compounds (1), those having at most 9 carbon atoms in R ₁ , R ₂ and R _{3 in} the formula (I) are preferred.

A typical example of the phenolic compound (2) is disclosed in
-76468 and 49-137692. Among the phenol compounds, those having 3 or 4 carbon atoms of R _{4 in} the above formula (II) are preferred.

Further, a typical example of the phenolic compound (3) is disclosed in
The details are described in the specifications of 49-130502 and 49-137692. Of these phenolic compounds, the aforementioned (II)
In the formula (I), R ₅ and R ₆ preferably have 18 or less carbon atoms, particularly preferably 4 or more carbon atoms.

In addition, a typical example of the phenolic compound (4) is disclosed in
Nos. 49-131159 and 49-133762. Among the phenolic compounds, the above (IV)
In the formula, R ₇ and R ₈ preferably have at most 18 carbon atoms, particularly preferably 4 or less. R ₉ preferably has at most 12 carbon atoms, particularly 1 to
Eight are preferred.

(J) Thiopropionate antioxidant Further, the thiopropionate antioxidant is used as an antioxidant for organic substances such as synthetic resins in the same manner as the phenolic antioxidant. Are often used in combination with the above-mentioned phenolic antioxidants. Among the thiopropionate-based antioxidants, the general formula of a representative one is represented by the following formulas ((V) to (VI)
Expression].

(However, R ₁₀ , R ₁₁ and R ₁₂ may be the same or different,
A hydrocarbon group selected from the group consisting of an alkyl group having 1 to 20 carbon atoms, an aryl group and an aralkyl group, and n is an integer of 1 to 20. Representative examples of the thiopropionate-based antioxidants are described in Rubber Digest, Handbook, Rubber and Plastic Compounding Chemicals (Rubber Digest, published in 1974).
Pages 111 to 111 and edited by Yamada et al., "Plastic Compounding Agents (Basic and Applied)" (Taiseisha, issued in 1969).
It is described in detail from page 130 to page 130. Of the thiopropionate-based antioxidants, those represented by the above formulas (V) and (VI) each preferably have at most 20 carbon atoms in R ₁₀ , R ₁₁ and R ₁₂ , and more preferably 12 The above is preferred. Representative examples of suitable thiopropionate-based antioxidants include dilauryl thiopropionate and pentaerythritol tetrakis (β-lauryl thiopropionate).

(K) Organophosphorus antioxidant The organophosphorus antioxidant is used as an antioxidant for organic substances such as synthetic resins in the same manner as the phenolic antioxidant and the thiopropionate antioxidant. It is often used in combination with the phenolic antioxidant and the thiopropionate antioxidant.

Among the organophosphorus antioxidants, the general formula of a representative one is represented by the following formula (VII).

(However, R ₁₃ , R ₁₄ , and R ₁₅ may be the same or different, and each is a group consisting of a hydrogen group and an alkyl group having 1 to 20 carbon atoms, an aryl group, an aralkyl group, an alkaryl group, and an alkenyl group. And at least one is a hydrocarbon group.) A typical example of the organic phosphorus antioxidant is "Handbook, Rubber and Plastic Compounding Chemicals" (Rubber Digest) edited by Rubber Digest Co., Ltd. Pages 297 to 2
Details are described on page 99 and pages 183 to 185 of "Practical Handbook of Additives for Plastics and Rubbers" (Kagaku Kogyo Co., Ltd., published in 1970).

Of the organic phosphorus antioxidants, those having 9 to 20 carbon atoms each of R ₁₃ , R ₁₄ and R _{15 in} the above formula (VII) are preferred. Representative examples of suitable organophosphate antioxidants include triphenyl phosphite, trioctadecyl phosphite and trinolyl phenyl phosphite.

(L) Composition ratio In the present invention, the composition ratio of the plasticizer in the total amount of the polyamide resin and its plasticizer is 1 to 30% by weight, preferably 2 to 30% by weight, and particularly preferably 3 to 30% by weight. It is suitable. If the composition ratio of the polyamide resin and its plasticizer is less than 1% by weight, the obtained product has poor flexibility.
On the other hand, if it exceeds 30% by weight, the plasticizer may bleed.

The composition ratio of the chlorinated polyethylene in the total amount of the chlorinated polyethylene, the polyamide resin and the plasticizer is 5.0 to 50% by weight, preferably 7.0 to 50% by weight, particularly preferably 8.0 to 50% by weight. is there. If the composition ratio of chlorinated polyethylene in the total amount of chlorinated polyethylene, polyamide resin and its plasticizer is less than 5.0% by weight, a drip phenomenon of a melting flame occurs during combustion, and the reinforcing effect of chlorinated polyethylene cannot be expected. In addition, the mechanical strength decreases due to the effect of the added flame retardant. On the other hand, if it exceeds 50% by weight, the mechanical strength decreases, and the bending resistance of tubes and hoses decreases.

Further, the composition ratio of the halogen-containing organic flame retardant and the metal oxide-based flame retardant to 100 parts by weight of the total amount of chlorinated polyethylene, polyamide resin and its plasticizer is 1.0 to 50 parts by weight as the total amount thereof. The amount is preferably 2.0 to 50 parts by weight, and particularly preferably 5.0 to 50 parts by weight. When the composition ratio of the halogen-containing organic flame retardant and the metal oxide-based flame retardant is less than 1.0 part by weight based on 100 parts by weight of the total amount of the chlorinated polyethylene, polyamide resin and its plasticizer, sufficient flame retardancy is obtained. I can't. On the other hand, if it exceeds 50 parts by weight, it is not preferable in terms of bleeding phenomenon and mechanical strength.

In addition, the composition ratio of the halogen-containing organic flame retardant and the metal oxide-based flame retardant to 100 parts by weight of the total amount of the chlorinated polyethylene, the polyamide resin and the plasticizer, Is at least 0.5 part by weight, preferably 1.0 part by weight or more, and particularly preferably 1.5 parts by weight or more.

In the present invention, the above-mentioned lubricant is added to improve the lubricating effect when extruding the composition.

In the present invention, when a lubricant, the above-mentioned dehydrochlorinating inhibitor, a phenolic antioxidant, a thiopropionate antioxidant and an organic phosphorus antioxidant are added (blended),
The mixing ratio thereof is generally at most 5.0 parts by weight, preferably 4.0 parts by weight or less, based on 100 parts by weight of the total amount of the chlorinated polyethylene, polyamide resin and its plasticizer. Even if each of them exceeds the upper limit, no further effect can be exhibited, and there is a problem in cost.

(M) Production of Composition, Production of Molded Product The composition of the present invention comprises the chlorinated polyethylene, polyamide resin, plasticizer, halogen-containing organic flame retardant and metal oxide-based flame retardant auxiliary, or Although it can be produced by uniformly mixing any of a lubricant, a dehydrochlorinating agent, a phenolic antioxidant, a thiopropionate antioxidant and an organic phosphorus antioxidant, chlorinated polyethylene Additives such as fillers, colorants and antistatic agents generally used in the field of polyamide resin and polyamide resin may be added (blended) within a range that does not substantially impair the properties of the composition of the present invention.

As a mixing method, a method of dry blending using a mixer such as a Henschel mixer generally performed in the field of synthetic resins, and an open roll,
Examples thereof include a method of mixing while melting using a mixer such as an extrusion mixer, a kneader, and a Banbury. Among these mixing methods, in order to obtain a more uniform composition, two or more of these mixing methods may be used in combination (for example, after dry-blending in advance, the mixture is melt-mixed). Above all, even when using a dry blend, even when using one kind or two or more kinds of melt-kneading methods, in producing a molded product by a molding method described below, it is used by producing a pellet using a pelletizer. Is preferred.

Among the above-mentioned mixing methods, both in the case of melt-kneading and in the case of molding by the molding method described later, the mixing must be carried out at a temperature at which the polyamide resin, chlorinated polyethylene and chlorine-containing organic compound used are melted. But,
If carried out at elevated temperatures, they need to be carried out at 230 ° C. or lower, since these can cause thermal decomposition or dehydrohalogenation reactions.

The molded product obtained as described above is usually formed in the field of hoses and pipes (for example,
Extrusion).

[Action]

In order to make polyamide resins such as nylon-11 and nylon-6 flame-retardant, it is necessary to add a large amount of a flame retardant and a flame-retardant auxiliary agent. Be done there. However, in the present invention, by blending a specific chlorinated polyethylene, not only flame retardancy but also mechanical properties can be solved. That is, the chlorinated polyethylene used in the present invention has a heat of crystal fusion measured by a differential scanning calorimeter of 5c.
al / g or less, and the Mooney viscosity is MS _{1 + 4} and 20 or more. It is considered that this chlorinated polyethylene has a relatively good affinity for the polyamide resin of the present invention, is microscopically dispersed in a polyamide resin matrix, and retains mechanical strength. On the other hand, the heat of crystal fusion is 5c
If chlorinated polyethylene exceeding al / g is used, the affinity with the polyamide resin of the present invention is poor, and the chlorinated polyethylene is dispersed in the form of a layer, which causes the delamination phenomenon of the obtained product. The chlorinated polyethylene of the present invention is a polymer substance itself, and is a flame retardant containing halogen (chlorine). In addition to the reduction, it is considered that the chlorinated polyethylene is strongly distributed to the flame retardant and the flame retardant auxiliary, thereby further preventing the mechanical strength from being lowered and the bleeding of the flame retardant auxiliary itself.

[Examples and Comparative Examples]

Hereinafter, the present invention will be described in more detail with reference to examples.

In Examples and Comparative Examples, the tensile strength at break and elongation were measured according to JIS K6911. The flame-retardant test uses a 1.6 mm (1/16 inch) thick specimen and meets UL-94 standards.
Measured according to the method. In the buckling test, the outer diameter is 6m.
m, 3 mm inside diameter and 100 mm length tube, 40 m diameter
It was wrapped around a cylinder of m and fractured due to the presence or absence of buckling. In addition, the blade test showed that the tube had a temperature of 50 ° C and a relative humidity of 90
% Was confirmed after standing for 7 days. In the peeling test, the tube was peeled off with the tube.

The manufacturing methods and physical properties of the chlorinated polyethylene, polyamide resin, halogen-containing organic flame retardant, metal oxide diameter flame retardant aid, and other additives used in the present invention and comparative examples are shown below.

[(A) chlorinated polyethylene]

As chlorinated polyethylene, all have a density of 0.940 g / c
m is ^3, and chlorinated copolymers of ethylene and butene-1 having an average molecular weight of about 200,000, the chlorinated degree is 30.4% by weight, a Mooney viscosity _{(MS 1 + 4, 100 ℃} ) 72 Chlorinated polyethylene (hereinafter referred to as "CPE (A)") having a heat of crystal fusion of 0.3 cal / g, a degree of chlorination of 30.5% by weight, a Mooney viscosity of 35, and a heat of crystal fusion Is 9.5c
Al / g chlorinated polyethylene (hereinafter referred to as "CPE (B)") and a chlorination degree of 30.4% by weight, a Mooney viscosity of 18, and a heat of crystal fusion of 0.1 cal / g Polyethylene (hereinafter referred to as "CPE (C)") was used.

[(B) polyamide resin]

Further, as a polyamide resin, the melting point is 184 ℃,
Nylon-11 (hereinafter referred to as “PA (1)”) having a melt flow index (measured at 235 ° C. and a load of 216 kg according to JIS K7210 at a load of 216 kg) of 2.4 g / 10 minutes and a melting point of 236 ° C. , Melt flow index is 1.4g / 10
Polyamide MXD6 (hereinafter referred to as “PA (2)”) was used.

[(C) Halogen-containing organic flame retardant]

Further, tetrabromobisphenol-A (hereinafter referred to as "flame retardant") was used as a halogen-containing organic flame retardant.

[(D) Metal oxide flame retardant]

Further, as a metal oxide-based flame retardant auxiliary, the average particle size is 1.5
μm antimony trioxide (hereinafter referred to as “Sb ₂ O ₃ ”)
Was used.

[(E) plasticizer]

Further, as a plasticizer of the polyamide resin, p-oxybenzoic acid ester (hereinafter, referred to as "plasticizer (a)") was used.

Examples 1 to 7 and Comparative Examples 1 to 9 Table 1 shows chlorinated polyethylene (CPE) and polyamide resins whose respective types and amounts are shown, and the respective amounts thereof are shown as flame retardants and Sb. ₂ O ₃ and a plasticizer and 1.0 part by weight of 2,6-di-tertiary-butylphenol (as a phenolic antioxidant) were each applied to an open roll having a surface temperature of 180 ° C.
Kneaded well for minutes. The resulting mixture was press-molded at a tensile breaking strength and an elongation rate of 200 ° C., and a test piece for each test and a tube were formed at 180 ° C. by extrusion. Measurement of tensile rupture strength and elongation from each obtained specimen and flame retardancy test, buckling test,
A bleed test and a peel test were performed, and the product was observed. Table 2 shows the results.

[Effect of the Invention] The cylindrical extruded product of the present invention exhibits the following effects.

(1) Excellent flame retardancy.

(2) Good flexibility.

(3) No bleed such as flame retardant.

(4) Almost no peeling.

(5) No dreep when burning.

(6) Excellent buckling (buckling).

The cylindrical extruded product of the present invention is promising as a control tube for industrial robots and other industrial tubes and hoses because it exerts the above effects (especially, good flexibility).

Continuation of the front page (51) Int.Cl. ⁶ identification code FI C08L 77/00 C08L 77/00 // B29L 24:00 (58) Field surveyed (Int.Cl. ⁶ , DB name) C08J 5/00 B29C 47/00 C08L 23/28 C08K 5/00 C08K 3/22 C08L 77/00

Claims (1)

(57) [Claims] (A) A chlorinated polyethylene having a heat of crystal fusion of 5 cal / g or less measured by a differential scanning calorimeter and a Mooney viscosity of 20 or more under conditions of MS _{1 + 4} and 100 ° C., B) a polyamide resin that melts at a temperature of 210 ° C., (C) a plasticizer of the polyamide resin, (D) a halogen-containing organic flame retardant, and (E) a metal oxide-based flame retardant auxiliary. And the composition ratio of the plasticizer in the total amount of the plasticizer is 1.0 to 30% by weight,
The composition ratio of chlorinated polyethylene in the total amount of chlorinated polyethylene, polyamide resin and its plasticizer is 5.
0 to 50% by weight, and the composition ratio of the halogen-containing organic flame retardant and the metal oxide-based flame retardant to 100 parts by weight of the total amount of the chlorinated polyethylene, polyamide resin and plasticizer is 1.0 as the total amount thereof. A flame-retardant cylindrical extruded product wherein the composition ratio of the halogen-containing organic flame retardant and the metal oxide-based flame retardant aid is at least 0.5 part by weight, respectively.