JPH0538746A - Flame-retardant polyamide blow-molded article - Google Patents

Abstract

PURPOSE:To obtain a blow-molded article excellent in impact resistance, heat resistance and flame retardance at a low temperature and a low humidity by a method wherein composition, which is prepared by compounding heat resistance improver, flame- retardant, flame-retardant assistant and halogen scavenger with specified crystalline polyamide at specified ratio so as to realize specified melt viscosity, is employed. CONSTITUTION:Crystalline polyamide, which consists of 50-90wt.% of hexamethylene adipamide component, 5-40wt.% of hexamethylene terephthalamide component and 5-30wt.% of hexamethylene isophthalamide component and the melting point Tm and crystallization temperature Tc of which satisfy tire following relationships: Tm>=225 deg.C and Tc<=230 deg.C. After that, by compounding 0.01-10 pts.wt. of heat resistance improver, 5-150 pts.wt. of flame-retardant, 1-50 pts.wt. of flame-retardant assistant and 0-20 pts.wt. of halogen scavenger with 100 pts.wt. of polyamide, flame-retardant polyamide composition with melt viscosity, which satisfies the formulae I and II, is obtained. In the formulae, T is the temperature, which satisfies the formulae: Tm+10 deg.C<=T<=Tm+70 deg.C, and mua10 and mua1000 represent the melt viscosities under the conditions that the shear rates at the temperature T are 10sec<-1> and 1,000sec<-1>.

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The present invention is excellent in high rigidity, heat resistance, impact resistance, chemical resistance, road deicing resistance, low water absorption, dimensional stability, heat distortion temperature characteristics, and flame retardancy. The present invention relates to a polyamide plastic blow-molded article, more specifically, a composition in which an inorganic or organic flame retardant is added to polyamide to impart flame retardancy, and further, an ethylene ionomer resin and / or carboxy is added to the composition. A modified elastomer, a processing stabilizer, a flame-retardant polyamide composition in which a fibrous reinforcing agent is blended in an appropriate combination, and is particularly rigid,
The present invention relates to a flame-retardant polyamide blow-molded product, particularly a three-dimensional blow-molded product, which is formed by forming an intimate mixture with improved heat distortion temperature characteristics and polymer melt retention stability.

[0002]

BACKGROUND OF THE INVENTION Polyamide resins are widely used as engineering plastics due to their excellent physical properties, but they are not necessarily satisfactory materials for use in a wider range of applications by taking advantage of the excellent properties of these polyamides. Absent. For example, in general, polyamide has a characteristic that the change in melt viscosity with respect to the shear rate is small, that is, the shear rate dependence of the melt viscosity is small,
Therefore, it is practically difficult to obtain a blow molded product of a large capacity container. In other words, when blow molding is performed using a normal screw type blow molding machine, the raw material polymer is plasticized at a high shear rate in the screw part, but in this case the melt viscosity is low in terms of the power and productivity of the extruder. On the other hand, while forming the parison from the molten polymer, it retains the morphology of the polymer melt extruded from the die sufficiently and has a high melting rate at a small shear rate in order to obtain uniform size and wall thickness of the molded product. It preferably has a viscosity. Therefore, in order to obtain a large blow-molded product with good dimensional stability, it is first necessary to have a high melt viscosity, but simply having a high melt viscosity of the raw material polymer is not sufficient and the melt viscosity is high. It is a very important condition that the shear rate dependence of is large. In particular, the flame retardant has a great influence on the melt viscosity of the composition, so that it needs to be devised.
Polyamide is a relatively tough material, but its toughness and impact resistance depend largely on temperature and moisture content. For example, polyamide at the time of normal temperature water absorption exhibits a considerably high impact resistance value. However, it becomes a very brittle material when it is absolutely dry or at low temperature. Therefore, in order to obtain a polyamide blow-molded product having a really high commercial value as a commercial product, improvement of impact resistance at low temperature and low moisture absorption is also one of the important problems to be overcome. Furthermore, due to the recent trend toward lighter automobiles and plasticization in the engine room, materials with heat resistance and flame retardancy are required, and they also have heat resistance and flame retardancy as well as impact resistance at low temperature and low moisture absorption. There is a demand for a material capable of forming a long and complicated part.

As mentioned above, although polyamide has various excellent properties, it has not been sufficiently utilized as a blow-molded article because of the above-mentioned drawbacks. It has a high melt viscosity without deteriorating the useful properties of the material, and its shear rate dependence is great, and it has high rigidity made of polyamide material, excellent impact resistance at low temperature and low moisture absorption, heat resistance, flame retardancy, and excellent moldability. The advent of blow-molded products is a long-awaited fact in the industry.

The use of polyamides in blow molding applications is already well known, and we have a process for producing polyamides with melt viscosity properties suitable for the production of large extrudates, blow moldings. Have already made a few suggestions. The outline is as follows. That is, a method in which a polyfunctional epoxy compound containing a vinyl epoxy group and a vinylene epoxy group is added to a polyamide and mixed and heated and melted (Japanese Patent Publication No. 487509), or trimesic acid of a lactam or the like is polymerized during polymerization of a monomer for polyamide. A method in which a diamine salt is added and polymerized (Japanese Patent Laid-Open Nos. 50-2790, 50-2791, 50-3193 and 50-10429).
No. 7, etc.) to introduce a branched chain into the polyamide molecule. The branched polyamide produced by this method certainly has good viscosity stability and high melt viscosity, and further has a property suitable for obtaining a blow-molded article that the change in melt viscosity with respect to the shear rate is large, No improvement was made in terms of impact resistance, and a blow-molded article having excellent impact resistance especially at low temperature and low moisture absorption could not be obtained. Next, we found that a solution to this drawback, that is, a method of blending an ethylene-based ionomer resin, an ethylene vinyl acetate copolymer, and the like with a branched polyamide is effective as a method for improving the impact strength of the branched polyamide (Japanese Patent Application Laid-Open No. S60-12065). 52-3
2944), and it has been found that nitrile rubber is extremely effective as an impact resistance improver for general polyamides (JP-A-53-21252). After that, we further found that even for general polyamides, an intimate mixture of polyamide and ethylene ionomer resin and / or carboxy-modified nitrile rubber is a material having excellent melt viscosity characteristics and impact resistance (Japanese Patent Publication No. 55
-41659).

On the other hand, it is known to add an organic halogen flame retardant for the purpose of imparting flame retardancy to polyamide.
For example, a method of adding decabromobiphenyl ether to a polyamide resin (JP-A-47-7134) and a method of adding a chlorine-substituted polycyclic compound (JP-A-48-298).
46) and a method of adding brominated polystyrene (JP-A-51-47044 and JP-A-61-18846).
No. 3), a method of adding brominated polyphenylene ether (Japanese Patent Publication No. 56-2100).

[0006]

However, with such materials of the prior art, even if an attempt is made to obtain a flame-retardant three-dimensional blow-molded product having a relatively long parison length, the appearance of the molded product is poor and the heat resistance is poor. Alternatively, even if the heat resistance is good, the parison is hard to solidify so that a long parison cannot be obtained. Therefore, it cannot be said that the material is sufficiently satisfactory for obtaining a three-dimensional blow molded product.

The object of the present invention is to solve the above-mentioned conventional problems. Mechanical properties such as high rigidity, chemical resistance, heat resistance, melt retention stability, impact resistance, etc. while having flame retardancy. In particular, it is to provide a flame-retardant polyamide blow-molded product capable of forming a three-dimensional blow-molded product.

[0008]

In order to achieve the above-mentioned object of the present invention, the present inventors have (1) (a) a hexamethylene adipamide component (hereinafter referred to as "6").
6) 50 to 90% by weight, (b) hexamethylene terephthalamide component (hereinafter abbreviated as 6T) 5 to 40% by weight, (c) hexamethylene isophthalamide component (hereinafter,
(Abbreviated as 6I) 5 to 30 wt% polyamide having a melting point (Tm) and a crystallization temperature (Tc) of Tm ≧ 225 ° C. and Tc ≦ 230 ° C. Polyamide obtained by blending B heat resistance improver 0.001 to 10 parts by weight, C flame retardant 5 to 150 parts by weight, D flame retardant auxiliary 1 to 50 parts by weight, E halogen scavenger 0 to 20 parts by weight The present invention provides a flame-retardant polyamide blow-molded product obtained by blow-molding a composition having a melt viscosity satisfying the formulas (I) and (II), wherein lnμa10 ≥ 10.50-0. .04 (T-Tm) ... (I) μa10 / μa1000 ≧ 3.3 (II) Where, Tm: melting point of polyamide (° C.) T: Tm + 10 ° C. ≦ T ≦ m + 70 ° C satisfying temperature (° C) μa10: temperature T (° C), Melt viscosity (poise) at shear rate of 10 (sec ^-1 ) μa 1000: temperature T (° C), shear rate of 1000 (sec
^-1 ) Melt viscosity (poise) 10 ° C ≤ T-Tm ≤ 70 ° C (2) Furthermore, the flame-retardant polyamide composition 100 described above.
A flame-retardant polyamide composition in which 5 to 100 parts by weight of an elastomer and / or 1 to 200 parts by weight of a fibrous reinforcing agent are blended with respect to 1 part by weight, and the formula (I) and the formula (II) are satisfied. In the case of blending an elastomer, a flame-retardant polyamide blow-molded article obtained by blow-molding a composition in which the average particle diameter of the dispersed phase consisting of the elastomer dispersed in the polyamide matrix phase is 10 microns or less is provided. Is.

That is, the feature of the present invention is that the melting point and crystallization temperature of the polyamide are optimized by specifying the composition of each component of the polyamide, and the polyamide and the heat resistance improver are
Melt viscosity characteristics of materials consisting of combinations of flame retardants, flame retardant aids, and halogen scavengers, that is, it makes it possible to obtain polyamide blow-molded products with good moldability that have a large shear rate dependence of melt viscosity. Impact resistance by blending an elastomer and / or fibrous reinforcing agent,
In particular, it has made it possible to obtain flame-retardant blow-molded products with excellent low-temperature impact resistance during dryness, heat distortion temperature characteristics, melt retention stability, and rigidity, especially three-dimensional blow-molded products that require a long parison.
Especially in blow molding machines with accumulators,
Without causing deterioration of flame-retardant materials and corrosion of equipment,
It has been found that a longer parison can be stably and easily obtained, and is particularly effective for three-dimensional blow molding of a complicated shape.

Various materials containing polyamide, which is a material for obtaining the blow-molded article of the present invention, and a heat resistance improver, a flame retardant, a flame retardant aid, a halogen trapping agent, an elastomer and / or a fibrous reinforcing agent in an effective amount. The melt viscosity of the composition is represented by the above formula (I).
And (II) must be satisfied.

The formula (I) is a formula that regulates the viscosity above a certain level required for blow molding, and if the melt viscosity does not satisfy the formula (I), the viscosity is low and blow molding cannot be performed well. Generally, the melt viscosity of a polymer is expressed as a function of the measurement temperature and the shear rate, but naturally the measurement temperature is determined from the melting point and the softening point of the polymer, so when discussing the specific value of the melt viscosity, The difference in melting points, ie (T-T
It is appropriate to display m) as a parameter. For melt viscosity, use an ordinary capillary viscometer and use ASTM-D-
It is a value measured according to the method specified in 1238.
The measurement temperature is generally selected in the range of 10 to 70 ° C. higher than the melting point of the polymer in relation to the molding temperature.

The formula (II) is a formula expressing the magnitude of the shear rate dependence of the melt viscosity, and is the ratio of the melt viscosity in the low shear rate region to the melt viscosity in the high shear rate region, It is a quantified size. When the melt viscosity characteristic does not satisfy the formula (II), the change in the melt viscosity with respect to the shear rate is small and blow molding cannot be performed satisfactorily, which is not preferable. The upper limit of the melt viscosity ratio (μa10 / μa1000) at the shear rates of 10 sec ^-1 and 1000 sec ^-1 expressed by the formula (II) is not specified, but a value of about 20 is common sense from the viewpoint of the performance of the molding machine. It becomes a value.

The melt viscosity of the material is determined by the above formulas (I) and (I
It is necessary to satisfy both of I), and if only one of the conditions is satisfied, a good blow molded product cannot be obtained.

The polyamide which can be used in the present invention has a composition range of (a) 66 component 50 to 90% by weight, (b) 6T component 5 to 40% by weight, and (c) 6I component 5 to 30% by weight. It is a prepared polyamide. If the 66 component is less than 50% by weight, the crystallinity of the obtained polyamide is small and the physical properties such as chemical resistance are unbalanced.
If it exceeds 90% by weight, the crystallization temperature exceeds 230 ° C., and a sufficiently long parison cannot be obtained during blow molding, which is not preferable. If the 6T component is less than 5% by weight, the melting point of the obtained polyamide will be lower than 225 ° C, the heat resistance will be deteriorated, and the physical properties will be unbalanced.
If it exceeds 5% by weight, the heat resistance is improved, but the crystallization temperature exceeds 230 ° C., which is a cause of accelerating the solidification of the parison during blow molding, which is not preferable. 5 about 6I component
When it is less than wt%, it becomes a substantially 66 / 6T copolymer, and the heat resistance is improved, but the crystallization temperature also exceeds 230 ° C, which is a factor to accelerate the solidification of the parison during blow molding, and when it exceeds 30 wt%, the 6I component is Since it is amorphous, its melting point decreases
The heat resistance will decrease. That is, the polyamide of the present invention reduces the crystallization temperature of nylon 66 by introducing the 6I component to improve blow moldability and
It is based on the design concept that the decrease in heat resistance due to the addition of component I is compensated by the addition of component 6T. A blow moldable polyamide having a well-balanced physical property cannot be obtained except for such a design concept. Furthermore, Tm ≧ 225 ° C., Tc ≦ 23
66,6 in order to obtain polyamide satisfying the condition of 0 ° C
Polymerization test was conducted step by step within the composition range of the T and 6I components, and Tm, Tc and crystallinity of the obtained polyamide were measured and determined by a differential scanning calorimeter (DSC).

As the polymerization method of polyamide, melt polymerization, interfacial polymerization, solution polymerization, bulk polymerization, solid phase polymerization and a combination of these methods are used, and generally melt polymerization is most suitable. The raw materials of the respective components may be charged into the polymerization vessel in the form of salts of 66, 6T or 6I, or may be charged in the form of respective monomers.

The degree of polymerization of the polyamide used here is not particularly limited, but in view of the dischargeability of the polyamide from the polymerization kettle, the relative viscosity is usually (1 g of polymer is 98% concentrated acid 10).
Dissolve in 0 ml and measure at 25 ° C. A polyamide having a ratio (same below) of 1.5 or more and less than 5 is desirable. It is also useful to add a monocarboxylic acid compound, a dicarboxylic acid compound, a monoamine compound, a diamine compound and their derivatives as a polymerization stabilizer to a polymerization kettle together with a monomer for polymerization in order to obtain the discharge stability of the polymer from the polymerization kettle. It can be used as a method. Examples of these compounds include acetic acid, benzoic acid, stearic acid, sebacic acid, adipic acid, dodecanedioic acid, undecanoic acid, terephthalic acid, isophthalic acid, suberic acid, cyclohexanedicarboxylic acid,
Stearylamine, ethylenediamine, decamethylenediamine, tetramethylenediamine, hexamethylenediamine and the like can be mentioned.

It is also included in a preferred embodiment that the obtained polyamide is subjected to melt polymerization if necessary, and then further subjected to solid phase polymerization in order to obtain a desired melt viscosity.

In the solid phase polymerization, the polyamide may be used as it is, or a phosphorus compound or the like may be added to the polyamide as a polymerization accelerator. As the phosphorus compound, phosphoric acid, phosphorous acid, hypophosphorous acid, pyrophosphoric acid, polyphosphoric acid and their alkaline earth metal salts are effectively used. Particularly, phosphoric acid is usually often used. The addition amount of the phosphorus compound is not particularly limited, but is preferably 0.01 to 5
%, More preferably 0.05 to 2%. One or more phosphorus compounds may be mixed and used. As a method for adding the phosphorus compound, a generally known method can be used. For example, a method in which a phosphorus compound or an aqueous solution of a phosphorus compound is added to pellets, powder, strips or the like of polyamide resin and mixed by a Henschel mixer, tumbler, ribbon mixer, or the like is preferably used. As a method of adjusting the melt viscosity, it is possible to melt-knead the polyamide resin to which the phosphorus compound is added, in addition to the solid-state polymerization. A known extruder can be used for the melt kneading.

The melting point of the polyamide used here is 22.
It is preferably 5 ° C. or higher. If the melting point is lower than 225 ° C, sufficient heat resistance cannot be obtained. The upper limit of the melting point is not particularly specified, but 300 ° C. or lower is appropriate from the viewpoint of operability during polymerization and moldability during molding. Crystallization temperature is 230
A temperature of ℃ or below is effective for obtaining a relatively long parison. If the temperature is higher than 230 ° C., the parison solidifies quickly and the desired parison length cannot be obtained. The lower limit of the crystallization temperature is not particularly limited, but is generally a temperature at which crystallization can be performed at room temperature, that is, 40 ° C.
The degree is reasonable. Although the crystallinity is not particularly limited, it is also possible to use the half-crystallization time in addition to the crystallization temperature as a standard for obtaining a long parison. A polyamide having the composition range of the present invention has a melting point of -20.
The half-crystallization time measured by DSC at a temperature of ° C is 400 seconds or longer, and if this value is longer than this value, it can be used without problems. As the heat resistance improver used in the present invention, a copper compound such as copper acetate, copper iodide, copper chloride or copper bromide is used. The copper compound may also be used in combination with an alkali halide such as potassium iodide, potassium chloride or sodium iodide. In addition to these inorganic heat resistance improvers,
Hindered phenol-based compounds (for example, trade name "IRGANOX" manufactured by Ciba-Geigy) and phosphite-based compounds (for example, trade name "IRGAFO manufactured by Ciba-Geigy) are commercially available as antioxidants or antioxidants.
S "and the like, thioether compounds, etc. can be suitably used. These antioxidants and antioxidants can be used alone or as a mixture of two or more kinds. The addition amount of these heat resistance improvers is polyamide 100. Parts by weight,
0.001 to 10 parts by weight, more preferably 0.0
1 to 5 parts by weight. If the amount added is less than 0.001 part by weight, the effect as a heat resistance improver will not be exhibited, and if added in excess of 10 parts by weight, the effect as a heat resistance improver will not change, but rather will adversely affect the properties of the material. give. The heat resistance improver may be added at any time during the polymerization of the polyamide, during the polymerization, after the polymerization and during the compounding with the flame retardant, and may be dry blended with the pellets at any time.

The flame retardant used in the present invention may be either an inorganic compound or an organic compound. Magnesium hydroxide is particularly useful as the inorganic flame retardant. As the characteristics of magnesium hydroxide, those having a magnesium hydroxide content of 95% by weight or more and a particle size distribution of 4 μm or less of 95% or more are particularly preferably used. In addition, the surface of magnesium hydroxide may be treated with a known surface treatment agent (for example, a silane coupling agent) in order to improve the adhesion to the polyamide and other polymers constituting the composition. .. As such magnesium hydroxide, the product name "Kisma" 5A, 5 manufactured by Kyowa Chemical Industry Co., Ltd.
B, 5E, 5EG, etc. In addition, fibrous magnesium hydroxide is particularly useful because it can be expected to have an effect as a reinforcing agent.

Organic phosphorus compounds as organic flame retardants,
Organic halogen compounds are useful. In particular, organic halogen-based flame retardants are useful. The halogen-based flame retardant is represented by the following formulas (III), (IV) and (V) and has a halogen content of 5
Examples thereof include brominated polyphenylene ether having 0 to 70% and a weight average molecular weight of 5000 or more, brominated polystyrene, and polybrominated styrene obtained by polymerizing dibrominated styrene.

[0022]

[Chemical 1]

(Here, n represents an integer of 2 to 400, and m
Represents an integer of 30 to 2000) As the halogen-based flame retardant, a commercially available product can be used. As an example of such a halogen-based flame retardant, brominated polyphenylene ether is GLC PO-64P, Brominated polystyrene is "Pyrocheck" 68PB, 60PB from Fellows.
However, polydibrominated styrene is GLC's PDBS-1
0, PDBS-80 and the like.

The above flame retardants can be used alone or in the form of a mixture, and the addition amount thereof is 5 to 150 parts by weight, preferably 10 to 130 parts by weight, relative to 100 parts by weight of polyamide. If the addition amount is less than 5 parts by weight, the flame retarding effect is insufficient, so that it is not preferable, and if the addition amount exceeds 150 parts by weight, mechanical properties of the resin composition deteriorate, which is not preferable.

The flame retardant aid used in the present invention is selected from antimony trioxide, zinc oxide, ferrous oxide, ferric oxide, stannous oxide and stannic oxide, which may be used alone or individually. It can be used in the form of a mixture of two or more kinds. The amount of the flame retardant aid added is 1 to 50 parts by weight, preferably 3 to 40 parts by weight, based on 100 parts by weight of the polyamide. 1
If the amount is less than 50 parts by weight, the flame retardancy is insufficient, which is not preferable. On the other hand, if the amount exceeds 50 parts by weight, the mechanical properties of the composition deteriorate.

The halogen scavenger used in the present invention is particularly effective when a halogen-based flame retardant is used. As a halogen scavenger, calcium carbonate, magnesium oxide, an organophosphate compound (for example, AM-
595 etc.), hydrotalcite-type compounds (for example,
Kyowa Chemical Industry Co., Ltd. DHT-4A, Kyoward 100
0, 2000, 1100, 2100, etc.). A flame-retardant stabilizer "MARK" EP-13,17,22, commercially available from Adeka Argus Co. for the same purpose.
"MARK" 273, "MARK" ZS-66, 506
Etc. can also be used. The halogen trapping agent traps halogen ions or halogen compounds generated from a halogen-based flame retardant or the like to prevent metal corrosion, and remarkably reduces gas generation during molding, foaming, coloring of polymer and the like. The amount of the halogen scavenger added is 0 to 20 parts by weight, and particularly preferably 0.01 when a halogen-based flame retardant is used.
10 to 10 parts by weight. When the amount of the halogen scavenger added is less than 0.01 when the halogen-based flame retardant is used, the effect as the halogen scavenger is insufficient, which is not preferable, and even if the amount added exceeds 20 parts by weight. It has no further effect.

The elastomer used in the present invention is not particularly limited as long as it is classified as an elastomer, and commercially available ones can be used. Particularly useful are ionomer resins, epoxy-modified polyolefins, carboxy-modified polyolefins, epoxy / carboxy mixed-modified polyolefins, and the like.

An example of the ionomer resin is an ionic polymer obtained by adding a metal ion having a valence of 1 to 3 to a copolymer of an α-olefin containing ethylene and an α, β-unsaturated carboxylic acid. .. Here, acrylic acid, methacrylic acid, itaconic acid, etc. are typical examples of α, β-unsaturated carboxylic acids, and Na ⁺ , K ⁺ , Ca ⁺⁺ , Zn are typical examples of metal ions having a valence of 1 to 3. ⁺⁺ and Al ^{+++ and the} like. As these ethylene-based ionomer resins, various grades generally marketed under the trade name of “HIMILAN” (former trade name “Surrin A”) can be used.

Examples of the epoxy-modified polyolefin, carboxy-modified polyolefin and epoxy / carboxy mixed-modified polyolefin include ethylene, propylene and butene-
1, butadiene, isoprene, 1,3-pentadiene,
Pentene-1,4-methylpentene-1, isobutylene, 1,4-hexadiene, dicyclopentadiene,
2,5-norbornene, 5-ethylidene norbornene,
5-ethyl-2,5-norbornadiene, 5- (1'-
Propenyl) -2-norbornene, styrene, α-methylstyrene, vinyltoluene, and the like obtained by radical polymerization of at least one olefin, and an epoxy compound (eg, glycidyl methacrylate) and α, β- It is a random, branched or block modified polyolefin obtained by introducing an unsaturated carboxylic acid or both. Examples of the α, β-unsaturated carboxylic acid used here include maleic acid, fumaric acid, itaconic acid, acrylic acid, methacrylic acid, methacrylic acid ester, crotonic acid, cis-4-cyclohexane-1,2-dicarboxylic acid. And its anhydrides, derivatives, and maleimides and their derivatives. The method of introducing the epoxy compound and the α, β-unsaturated carboxylic acid is not particularly limited, and the main component olefins and the α, β-unsaturated carboxylic acid are mixed and copolymerized, or a radical initiator is added to the polyolefin. It is possible to use a method such as grafting and introducing an α, β-unsaturated carboxylic acid with. The amount of the epoxy compound and the α, β-unsaturated carboxylic acid introduced is 0.001 to 40 mol%, preferably 0.01
It is suitable to be in the range of ˜35 mol%.

Specific examples of the epoxy-modified polyolefin and carboxy-modified polyolefin which are particularly useful in the present invention include ethylene / ethyl acrylate, ethylene / ethyl acrylate-g-maleic anhydride copolymer ("g" represents a graft, Same), ethylene / methyl methacrylate-g-maleic anhydride copolymer, ethylene / ethyl acrylate-g-maleimide copolymer, ethylene / ethyl acrylate-g-N-phenyl maleimide copolymer and copolymers thereof. Saponified product, ethylene / propylene-g-maleic anhydride copolymer, ethylene / butene-
1-g-maleic anhydride copolymer, ethylene / propylene / 1,4-hexadiene-g-maleic anhydride copolymer, ethylene / propylene / dicyclopentadiene-g
-Maleic anhydride copolymer, ethylene / propylene /
2,5-Norbornadiene-g-maleic anhydride copolymer, ethylene / propylene-g-N-phenylmaleimide copolymer, ethylene / butene-1-g-N-phenylmaleimide copolymer, styrene / maleic anhydride Styrene / ethylene / butylene / obtained by grafting maleic anhydride after hydrogenating the copolymer, styrene / butadiene / styrene-g-maleic anhydride block copolymer, styrene / butadiene / styrene block copolymer Styrene-g-maleic anhydride block copolymer,
Examples thereof include styrene / isoprene-g-maleic anhydride block copolymer, and these can be used alone or in the form of a mixture.

In the present invention, when the elastomer is blended, the amount of the elastomer added exerts the effect of increasing the shear rate dependence of the melt viscosity of the composition more effectively, and a blow molded article having more excellent impact resistance is obtained. Therefore, 5 parts by weight or more of elastomer is used for 100 parts by weight of polyamide. From the viewpoint of heat resistance and the characteristics of polyamide-based material, 1
The amount is preferably 00 parts by weight or less, particularly preferably 10 to 90 parts by weight. The elastomer in the composition is dispersed in the polyamide as a matrix, and it is desirable that the flame-retardant polyamide blow-molded article of the present invention be intimately mixed in order to have superior impact strength. As one of the methods for evaluating the mixed state of the polymer, there is a method in which the particle size of the dispersed phase is used as an evaluation scale, but when the elastomer is compounded in the flame-retardant polyamide blow-molded article of the present invention, the dispersed particles of the elastomer part In order to obtain a molded article excellent in impact resistance, it is preferable that the particles have an average diameter of 10 microns or less, more preferably 5 microns or less. If the dispersed average particle size of the elastomer is too large, the effect of improving the impact strength decreases, and it becomes impossible to obtain a molded article having excellent impact resistance especially at low temperature and low moisture absorption. However, since the elastomer used in the present invention has good compatibility with polyamide, it is possible to relatively easily achieve the intimate mixed state defined here. More preferably, it is more preferable to use an extruder once before blow molding. Melt kneading is desirable. If an elastomer is a constituent of the composition, it is preferably treated in the same way. As the blow molding machine, it is suitable to use a blow molding machine equipped with a screw having a high kneading capacity. In order to examine the mixed state of the blow molded product, that is, the particle size of the dispersed phase in the matrix phase, a part of the molded product may be cut off and the particle size may be directly measured with a microscope or the like. The dispersibility of the flame retardant and the fibrous reinforcing agent can be evaluated at the same time.

To the composition of the present invention, it is useful to add a processing stabilizer for polyolefin in order to prevent deterioration of the elastomer. As these processing stabilizers, those commercially available as antioxidants, metal deactivators, processing stabilizers, ultraviolet absorbers and ultraviolet stabilizers can be preferably used. For example, the trade name "IRGANO" of Ciba-Geigy
X ”,“ IRGAFOS ”,“ TINUVIN ”,“ C
HIMASSORB ”, hindered phenolic compounds, phosphite compounds, thioether compounds and other metal deactivators, resin modifiers, light stabilizers and the like, which are represented by the ADEKA ARGUS trademark“ MARK ”,
Sumitomo Chemical Co., Ltd.'s trade name "Sumilizer",
“Sumisorb”, “Antigene”, “St
Various additives represented by "abinol" are listed.

The amount of the processing stabilizer added depends on the thermal stability of the elastomer and the mechanical properties of the composition.
0.001 to 10 parts by weight is preferable with respect to parts by weight,
It is particularly preferably 0.01 to 7 parts by weight.

It is useful to add the fibrous reinforcing agent used in the present invention in order to obtain the rigidity and high heat distortion temperature of the raw material flame-retardant polyamide composition. Examples of the fibrous reinforcing agent include aramid fiber, polyamide fiber, glass fiber, carbon fiber, alumina fiber, silicon carbide fiber, boronaceous fiber, zirconia fiber and potassium whisker titanate, but glass fiber and carbon fiber are particularly preferable. Used. These fibrous reinforcing agents may be untreated, or may be a silane coupling agent having good thermal stability, such as triethoxy-γ-aminopropylsilane and N-β.
It may be surface-treated with (aminoethyl) -γ-aminopropyltrimethoxysilane, vinyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane, etc., and two or more of these fibrous reinforcing agents should be used. Is also possible. In addition to fibrous reinforcing agents, so-called inorganic fillers such as talc, kaolin, gypsum, mica, quartz, calcium carbonate, magnesium hydroxide, calcium phosphate, titanium phosphate, sericite, anhydrous mica, wollastonite, diatomaceous earth, White clay, white carbon, carbon black, zinc powder, etc. can be added.

The fibrous reinforcing agent of the present invention is polyamide 100.
1 to 200 parts by weight, particularly preferably 5 to 1 part by weight
It is desirable to add 50 parts by weight. Further, other components such as pigments, crystallization accelerators, lubricants, mold release agents and the like can be added to the blow-molded product of the present invention to the extent that the moldability and physical properties are not impaired.

[0036]

EXAMPLES The present invention will be described in more detail with reference to the following examples. The properties of the blow-molded products described in Examples and Comparative Examples were evaluated by the following methods.

(I) Melt viscosity: ASTM-D-1238
It was measured using a melt indexer manufactured according to.

(Ii) Flammability: length 5 inches, width 1/2
Inch, 1/16 inch thick test piece is molded and
NDER WRITERS LABORATORIES
It was measured according to the UL-94 standard defined in.

(Iii) Dispersed particle size: A part of the molded product was cut out, fragmented with a microtome, dyed and observed with an electron microscope.

(Iv) Three-dimensional blow moldability: A parison having an outer diameter of 20 mm and a wall thickness of 4 mm was formed using a blow molding machine with an accumulator and a three-dimensional blow molding die, and an outer diameter of 50 mm.
The shape of the molded product when molded into a complicated pipe having a length of 800 mm and a length of 800 mm was evaluated.

(V) Heat resistance stability: In three-dimensional blow molding, melt retention stability was evaluated by the appearance of the parison and the state of gas generation.

(Vi) Impact resistance: A reagent container having an inner volume of 500 ml obtained by blow molding was filled with water at 0 ° C., the mouth was sealed, and the bottom was directed downward from a height of 2.5 m. It was repeatedly dropped on a horizontal concrete floor, and the number of drops until damage to the container was examined. This test was conducted on 5 containers made under constant conditions.

The present invention is not limited to the following examples unless it exceeds the gist.

Reference Example 1 (Production of Polyamide of the Present Invention) 66 component (raw material: hexamethylenediamine / adipic acid), 6T component (raw material: hexamethylenediamine / terephthalic acid), 6I component (raw material: hexamethylenediamine / isophthalic acid) Acid) so as to have the composition shown in Table 1, each monomer was weighed and charged into a polymerization kettle, and melt-polymerized to obtain a polymer. After the completion of the polymerization, it was discharged from the bottom of the polymerization kettle and drawn into a strand to be pelletized with a pelletizer. After the pellets were vacuum dried, various properties were measured and the results shown in Table 1 were obtained.

[0045]

[Table 1]

Example 1 Polyamide species N-1 of Reference Example 1 was solid phase polymerized to 280
Melt viscosity at ℃, shear rate 10sec ^-1 μa10 = 60
A 000 poise polyamide was obtained. This polyamide 10
0 parts by weight, 28 parts by weight of brominated polystyrene (“Pyrocheck” 68PB) manufactured by Ferro, 6 parts antimony trioxide
Parts by weight, copper iodide 0.03 parts by weight, potassium iodide 0.
2 parts by weight and 0.3 parts by weight of a hydrotalcite compound (DHT-4A manufactured by Kyowa Chemical Industry Co., Ltd.) were mixed with a Henschel mixer, and this mixture was PCM30 manufactured by Ikegai Co., Ltd.
It is supplied to the hopper of a twin-screw extruder, and the cylinder temperature is 28
The mixture was melt-kneaded under the conditions of 0 ° C. and a screw rotation speed of 200 rpm, and the strand was cooled and pelletized with a pelletizer. After vacuum-drying the pellets, various properties were evaluated and the results shown in Tables 2 and 3 were obtained. This composition has melt viscosity characteristics,
It had satisfactory properties such as flame retardancy, heat resistance, and three-dimensional blow moldability of complex shapes.

Examples 2 to 5 Polyamides obtained by solid phase polymerization of the polyamide used in Example 1 and the polyamide species N-2 of Reference Example 1 (270 ° C.,
Melt viscosity at shear rate of 10 sec ^-1 is μa10 = 6200
0 poise) and the heat resistance improver, flame retardant, flame retardant aid, and halogen scavenger are changed in kind and addition amount, and kneading, molding, and evaluation of physical properties are conducted in the same manner as in Example 1 and Tables 2 and 3 are shown. The results shown in are obtained. Each of the flame-retardant polyamide compositions obtained here had high heat resistance, and also had excellent flame resistance, three-dimensional blow moldability, and impact resistance, and was of extremely high practical value.

COMPARATIVE EXAMPLE 1 A polyamide copolymer having a composition of 66 components 45% by weight, 6T component 45% by weight, and 6I component 10% by weight was prepared as Reference Example 1.
Polymerized in the same manner as in. This polyamide copolymer has a melting point of 280 ° C., a crystallization temperature of 235 ° C. and a melt viscosity of 300 at a shear rate of 10 sec ⁻¹ measured at 300 ° C.
It was 0 poise. Solid-state polymerization of this polyamide 30
Melt viscosity at 0 ° C and shear rate of 10 sec ^-1 is μa = 60
A 000 poise polyamide was obtained. This polyamide 10
The flame retardant and the flame retardant aid of Example 1 were added to 0 parts by weight, and the same operation as in Example 1 was carried out to obtain a flame retardant polyamide composition, which was evaluated and the results shown in Tables 2 and 3 were obtained. .. This composition had a high crystallization rate, and a good three-dimensional blow-molded product could not be obtained due to the solidification of the parison tip.

[0049]

[Table 2]

[0050]

[Table 3]

Examples 6 to 11 The polyamide of Reference Example 1 was solid-phase polymerized to obtain a shear rate of 10
The melt viscosity μa10 at sec ^-1 is 60000 poise (T = 280 ° C.) for N-1 and 62000 poise (T = 2) for N-2.
70 ° C.) polyamide was obtained. These polyamides 10
Heat resistance improver, flame retardant, flame retardant aid, halogen scavenger and elastomer, and processing stabilizer against 0 parts by weight are shown in Tables 4 and 5.
The composition was weighed and compounded in the same manner as in Example 1 and operated in the same manner as in Example 1 to prepare a composition, which was then pelletized. After vacuum-drying the pellets, various properties were evaluated and the results shown in Tables 4 and 5 were obtained.
The composition obtained here had satisfactory high practical value properties in melt viscosity characteristics, flame retardancy, dispersed particle size of elastomer, impact resistance, heat stability and three-dimensional blow moldability. ..

Comparative Example 2 Flame retardant properties were obtained by adding the flame retardant, flame retardant aid, and elastomer of Example 6 to 100 parts by weight of the polyamide of Comparative Example 1 after the solid-state polymerization, and operating in the same manner as in Example 1. A polyamide composition was prepared and evaluated, and the results shown in Tables 4 and 5 were obtained. This composition had a high crystallization rate, and a solid molded three-dimensional blow molded product could not be obtained due to solidification of the parison tip.

[0053]

[Table 4]

[0054]

[Table 5]

Examples 12 to 14 Polyamide 100 used in Examples 6 to 11 after solid state polymerization
A heat resistance improver, a flame retardant, a flame retardant aid, a halogen scavenger and a fibrous reinforcing agent were weighed and mixed in parts by weight at the compounding ratio shown in Table 6, and the same operation as in Example 1 was repeated to prepare a composition. Prepared and pelletized. After vacuum drying the pellets, various properties were evaluated and the results shown in Table 6 were obtained. The composition obtained here had highly practical properties in melt viscosity characteristics, flame retardancy, impact resistance, heat stability and three-dimensional blow moldability.

Comparative Example 3 It was difficult to operate in the same manner as in Example 1 by adding the flame retardant, the flame retardant aid and the fibrous reinforcing agent of Example 12 to 100 parts by weight of the polyamide after the solid state polymerization of Comparative Example 1. A flammable polyamide composition was prepared and evaluated, and the results shown in Table 6 were obtained. This composition had a high crystallization rate, and a solid molded three-dimensional blow molded product could not be obtained due to solidification of the parison tip.

[0057]

[Table 6]

Examples 15 to 19 Polyamide 100 used in Examples 6 to 11 after solid state polymerization
A heat resistance improver, a flame retardant, a flame retardant aid, a halogen scavenger, an elastomer, a processing stabilizer, and a fibrous reinforcing agent were weighed and blended in the mixing ratios shown in Tables 7 and 8 with respect to parts by weight. A composition was prepared in the same manner and pelletized. After vacuum-drying the pellets, various properties were evaluated and the results shown in Tables 7 and 8 were obtained. The composition obtained here had highly practical properties in melt viscosity characteristics, flame retardancy, dispersed particle diameter of elastomer, impact resistance, heat stability and three-dimensional blow moldability.

Comparative Example 4 100 parts by weight of the polyamide after the solid state polymerization of Comparative Example 1 was mixed with the flame retardant, the flame retardant aid, the elastomer and the fibrous reinforcing agent of Example 15 in the compounding ratios shown in Tables 7 and 8. A flame-retardant polyamide composition was prepared and evaluated in the same manner as in Example 1, and the results shown in Tables 7 and 8 were obtained. This composition had a high crystallization rate, and a solid molded three-dimensional blow molded product could not be obtained due to solidification of the parison tip.

[0060]

[Table 7]

[0061]

[Table 8]

[0062]

EFFECTS OF THE INVENTION By using the flame-retardant polyamide composition of the present invention, it becomes possible to produce a flame-retardant blow-molded article having desirable properties that could not be achieved by a conventional single material. Utilizing its excellent features, it has become possible to use it for various flame-retardant blow-molded products. In particular, the flame-retardant polyamide composition of the present invention provides a flame-retardant blow-molded article having heat resistance, high impact resistance, high rigidity, and high heat distortion temperature characteristics as well as flame retardancy, and particularly a three-dimensional blow of a complicated shape. The fact that flame-retardant molding of molded products has become possible matches the recent trends of automobile weight reduction and flame-retardant, and its significance is significant.

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Claims (4)

[Claims] 1. A (a) hexamethylene adipamide component
A polyamide comprising 50 to 90% by weight, (b) a hexamethylene terephthalamide component of 5 to 40% by weight, and (c) a hexamethyleneisophthalamide component of 5 to 30% by weight, and having a melting point (Tm) and a crystallization temperature. (Tc) is Tm ≧ 225 ° C. Tc ≦ 230 ° C. 100 parts by weight of a crystalline polyamide, B B heat resistance improver 0.001 to 10 parts by weight, C flame retardant 5 to 150 parts by weight, D A flame-retardant polyamide composition comprising 1 to 50 parts by weight of a flame retardant aid and 0 to 20 parts by weight of an E halogen scavenger, and a melt viscosity satisfying formulas (I) and (II). Flame-retardant polyamide blow-molded product obtained by molding the composition. ln μa10 ≧ 10.50−0.04 (T-Tm) ··· (I) μa10 / μa1000 ≧ 3.3 ··· (II) Where, Tm: melting point of polyamide (° C) T: Temperature (° C) that satisfies Tm + 10 ° C ≤ T ≤ Tm + 70 ° C μa 10: Temperature T (° C), melt viscosity (poise) at shear rate 10 (sec ^-1 ) μa 1000: Temperature T (° C), shear Speed 1000 (sec
^-1 ) Melt viscosity (poise) 2. A flame-retardant polyamide composition comprising the flame-retardant polyamide composition according to claim 1 and 5 to 100 parts by weight of an elastomer, based on 100 parts by weight of polyamide. Satisfying the formulas (I) and (II) according to claim 1, and blow molding a composition in which the average particle diameter of the dispersed phase consisting of the elastomer dispersed in the polyamide matrix phase is 10 microns or less. Flame-retardant polyamide blow molded product. 3. A flame-retardant polyamide composition comprising the flame-retardant polyamide composition according to claim 1, and 1 to 200 parts by weight of a fibrous reinforcing agent with respect to 100 parts by weight of polyamide. The melt viscosity thereof is represented by the formula (I) according to claim 1.
And a flame-retardant polyamide blow-molded product obtained by blow-molding a composition satisfying the formula (II). 4. A flame-retardant polyamide composition comprising the flame-retardant polyamide composition according to claim 2, and 1 to 200 parts by weight of a fibrous reinforcing agent to 100 parts by weight of polyamide. The melt viscosity thereof is represented by the formula (I) according to claim 1.
And a flame-retardant polyamide blow-molded product obtained by blow-molding a composition satisfying the formula (II).