JPH10168308A - Flame retardant polyamide composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject composition having extremely high flame- retardancy, generating remarkably decreased amount of gases in molding, causing extremely low corrosion of the mold and useful for electric and electronic parts, etc., by compounding a specific alkaline earth metal compound. SOLUTION: This polyamide resin composition is composed of (A) 1-00 pts.wt. of a polyamide resin composition composed of (a) 30-90wt.% of a polyamide, (b) 8-40wt.% of a bromine-based flame-retardant, (c) 1-20wt.% of a flame- retarding assistant and (d) 0.01-2wt.% of at least one kind of alkaline earth metal compound selected from (i) an alkaline earth metal hydroxide and (ii) alkaline earth metal carbonate and (B) 10-100 pts.wt. of an inorganic reinforcing agent. Preferably, the component (b) is a brominated polystyrene, the component (c) is antimony oxide and the component (d) is calcium hydroxide.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a flame-retardant polyamide composition. In particular, the present invention relates to a flame-retardant polyamide composition which is suitably used for components such as connectors in the electric and electronic fields and electrical components in the automotive field. In particular, the present invention relates to a flame-retardant polyamide composition in which the amount of gas generated during molding processing is significantly reduced and the mold corrosion is extremely low.

[0002]

2. Description of the Related Art Conventionally, polyamide resins have a high mechanical strength,
Because of its excellent heat resistance, automotive parts, machine parts,
Used in fields such as electric and electronic components. In recent years, in particular, in the field of electric and electronic parts, the required level of flame retardancy has become increasingly higher, and a higher degree of flame retardancy than the self-extinguishing property inherent in polyamide resin has been required. Underwriters Laboratory's UL- Numerous studies have been made on the enhancement of the flame retardant level conforming to the 94 standard, and they are generally carried out by adding a halogen-based flame retardant.

For example, addition of a chlorine-substituted polycyclic compound to a polyamide resin (JP-A-48-29846) and addition of a bromine-based flame retardant such as decabromodiphenyl ether (JP-A-47-7134). , Addition of brominated polystyrene (JP-A-51-47044,
No. 175371), addition of brominated polyphenylene ether (Japanese Patent Application Laid-Open No. 54-116054), addition of a brominated crosslinked aromatic polymer (Japanese Patent Application Laid-Open No. 63-317552), brominated styrene-maleic anhydride. Addition of polymers (JP-A-3-168246) is known.

[0004] In electrical and electronic parts applications, particularly in connectors for mounting and connecting to printed laminates, flame-retardant polyamide compositions with high strength and high rigidity have been demanded with miniaturization and thinning. . For this reason, the flame-retardant polyamide resin obtained by the above-mentioned known technology, for example, a material in which an inorganic reinforcing material such as glass fiber is blended is used. Gas generation from unpurified oligomer volatile components and their decomposition products derived from halogen-based flame retardants causes mold corrosion and mold contamination due to the generation of mold deposits, leading to reduced productivity and adhesion of foreign substances to molded products. I was For this reason, for the purpose of suppressing gas generation and corrosion at the time of molding, addition of a phosphate (JP-A-3-244664) and concurrent use of hydrotalcite (JP-A-2-142852), etc. However, the level of improvement was not always satisfactory.

[0005]

DISCLOSURE OF THE INVENTION The present invention has extremely high flame retardancy, significantly reduces the amount of gas generated during molding,
An object of the present invention is to provide a flame-retardant polyamide composition having extremely low mold corrosion.

[0006]

Means for Solving the Problems As a result of intensive studies, the present inventors have found that a brominated flame retardant, a flame retardant auxiliary, an inorganic filler,
It has been found that the purpose can be achieved by blending a specific alkaline earth metal compound into a system in which the polyamide and the polyamide are combined, and based on this finding, the present invention has been completed.

That is, the present invention is as follows. (1) (a) 30 to 90% by weight of polyamide, (b) 8 to 40% by weight of brominated flame retardant, (c) 1 to 20% by weight of flame retardant auxiliary, and (d) hydroxylation of alkaline earth metal , 100 parts by weight of a polyamide resin composition comprising 0.01 to 2% by weight of at least one alkaline earth metal compound selected from alkaline earth metal carbonates, and (e) inorganic reinforcing material 10 to 10.
A flame-retardant polyamide composition comprising 100 parts by weight. (2) (b) The brominated flame retardant is selected from brominated polystyrene, brominated styrene maleic anhydride polymer, brominated polyphenylene ether, brominated epoxy resin, brominated cross-linked aromatic polymer, and brominated phenoxy resin. 2. The flame-retardant polyamide composition according to the above 1, which is at least one kind of flame retardant. (3) (1) wherein the flame retardant aid is at least one flame retardant aid selected from antimony oxide, sodium antimonate, tin oxide, iron oxide, and zinc borate. Flame retardant polyamide composition. (4) The flame-retardant polyamide composition as described in (1) above, wherein the alkaline earth metal hydroxide is at least one selected from calcium hydroxide, magnesium hydroxide and barium hydroxide. (5) The flame-retardant polyamide composition as described in (1) above, wherein the alkaline earth metal carbonate is at least one selected from calcium carbonate, magnesium carbonate, and barium carbonate. (6) (b) the brominated flame retardant is brominated polystyrene, (c) the flame retardant aid is antimony oxide, and (d)
2. The flame-retardant polyamide composition according to the above 1, wherein the alkaline earth metal compound is calcium hydroxide.

Hereinafter, the present invention will be described in detail. The polyamide (a) used in the present invention includes aliphatic polyamides such as 46 nylon, 6 nylon, 66 nylon, 610 nylon, 612 nylon, 11 nylon and 12 nylon, hexamethylene terephthalamide, tetramethylene isophthalamide, and hexamethylene. Isophthalamide,
Aromatic polyamides containing aromatic components such as terephthalic acid, isophthalic acid, xylylenediamine and the like such as meta-xylylene adipamide, and copolymerized polyamides and mixed polyamides containing these as main components are exemplified. Particularly in terms of heat resistance and moldability, 6 nylon, 66 nylon,
46 nylon is preferred.

The brominated flame retardant (b) used in the present invention includes brominated polystyrene, brominated styrene maleic anhydride polymer, brominated polyphenylene ether, brominated epoxy resin, brominated cross-linked aromatic polymer, bromine Phenoxy resin and the like. Specific examples of these include Pyrocheck 68PB (registered trademark) manufactured by Ferro, Pyrocheck LM (registered trademark), and PDBS- manufactured by Great Lakes.
80 <registered trademark>, PDBS-10 <registered trademark>, ERB-370FK <registered trademark> manufactured by Manac, PO64P <registered trademark> manufactured by Great Lakes Inc., F manufactured by Maktesim
2400 <registered trademark> and the like. Among them, brominated polystyrene and brominated polyphenylene ether are particularly preferred from the viewpoint of heat resistance and non-bleed-out property.

The flame retardant aid (c) used in the present invention includes:
Antimony oxides such as diantimony trioxide, diantimony tetroxide, diantimony pentoxide and sodium antimonate; tin oxides such as tin monoxide and tin dioxide; iron oxides such as ferric oxide and gamma iron oxide; Zinc acid and the like. Specific examples of the antimony oxides include Patox C <registered trademark>, Patox M <registered trademark>, Apox S <registered trademark> manufactured by Nippon Seiko, and antimony oxide KU and FS <registered trademark> manufactured by Sumitomo Metal Mining Co., Ltd. Daiichi Kogyo Seiyaku Co., Ltd., Pirogard AN-700, AN-800 and AN-
Antimony oxide such as 900 <registered trademark>.
In addition, examples of sodium antimonate include Nissan Chemical Co., Ltd.'s Sanpoc NA-1075 (registered trademark), and Nippon Seiko Co., Ltd.'s sodium antimonate S.

Specific examples of zinc borate include FIREBRAKE 290 (registered trademark) (Zinc borate ZB2335) manufactured by Borax Corporation of the United States. Of these, antimony oxides such as diantimony trioxide, diantimony tetroxide, and diantimony pentoxide are preferred from the viewpoint of the flame retardant effect. These flame retardant aids can be used alone or in combination of two or more.

In order to further enhance the flame retardant effect, the flame retardant auxiliary preferably has an average particle size of 0.01 to 10 μm. The alkaline earth metal compound (d) used in the present invention includes beryllium hydroxide, magnesium hydroxide,
Alkaline earth metal hydroxides such as calcium hydroxide, strontium hydroxide, barium hydroxide, and radium hydroxide;
Alkaline earth metal carbonates such as magnesium carbonate, calcium carbonate, barium carbonate and the like can be mentioned. The alkaline earth metal compounds may be used alone or as a mixture of two or more. Especially calcium hydroxide,
Calcium metal compound of calcium carbonate, magnesium hydroxide, magnesium metal compound of magnesium carbonate has a large effect of suppressing gas generation, and among them, calcium hydroxide has a particularly large gas generation suppressing effect with a small amount of addition,
It is particularly preferable because there is no decrease in physical properties and no deterioration in moldability. The particle size of the alkaline earth metal compound is not particularly limited, but is preferably 100 μm or less so as not to cause deterioration in physical properties.

The inorganic reinforcing material (e) used in the present invention includes:
Glass fiber, carbon fiber, potassium titanate fiber, gypsum fiber, brass fiber, stainless steel fiber, steel fiber, ceramic fiber, boron whisker fiber, mica, talc, silica, calcium carbonate, kaolin, calcined kaolin, wollastonite, glass beads , A glass flake, a titanium oxide or the like, a fibrous, granular, plate-like, or acicular inorganic reinforcing material. These reinforcing materials may be used in combination of two or more. Particularly, glass fibers are preferably used. As the glass fiber, a long fiber type roving, a short fiber type chopped strand, a milled fiber, or the like can be used. Further, it is preferable to use a glass fiber which is surface-treated for polyamide.

In the present invention, component (a), component (b),
In the polyamide resin composition comprising the components (c) and (d), the proportion of the main polyamide resin (a) needs to be in the range of 30 to 90% by weight. 30
If the amount is less than 90% by weight, the formability is impaired, and if it exceeds 90% by weight, the flame retardancy is reduced. The proportion of the brominated flame retardant (b) is in the range of 8 to 40% by weight, preferably 20 to 35% by weight. If the amount of the component (b) is less than 8% by weight, the flame retardant effect is not sufficient, and if it exceeds 40% by weight, during the kneading and molding, the volatile oligomer contained in the brominated flame retardant and its decomposing components cause corrosiveness. This causes problems such as generation of gas, adhesion of contaminants to a molding die, and deterioration of the appearance of a molded product.

The proportion of the flame retardant aid (c) is 1 to 20% by weight,
Preferably it is 3 to 15% by weight. If it is less than 1% by weight, the effect of suppressing drippings generated during combustion is not recognized, and
If it exceeds 0% by weight, the mechanical properties of the finally obtained flame-retardant polyamide composition are reduced. The proportion of the alkaline earth metal compound (d) is 0.01 to 2% by weight, preferably 0.1 to 2% by weight.
The range is from 0.5 to 1.5% by weight. If it exceeds 2% by weight, not only the quantitative improvement effect is not recognized, but also the mechanical properties are reduced and the molding fluidity is deteriorated. Also 0.
If it is less than 01%, no gas generation suppressing effect is observed. When the amount of the alkaline earth metal compound is 0.5 to 2 parts by weight based on 100 parts by weight of the brominated flame retardant, when the finally obtained flame retardant polyamide composition is molded, remarkable gas generation is suppressed. The effect is recognized. Although the mechanism of action of alkaline earth metal compounds is not always clear, it neutralizes hydrogen bromide and hydrogen chloride, which are contained in brominated flame retardants and tend to be released at high temperatures, stabilizing the brominated flame retardants themselves. It is estimated that Further, the alkaline earth metal compound has an effect of preventing thermal discoloration of the flame-retardant polyamide composition of the present invention during extrusion or molding.

The amount of the inorganic reinforcing material (e) is from 10 to 1 based on 100 parts by weight of the polyamide resin composition comprising the components (a), (b), (c) and (d).
00 parts by weight, preferably 15 to 80 parts by weight. If the amount is less than 10 parts by weight, no manifestation of mechanical strength and rigidity is observed, and if it exceeds 100 parts by weight, not only the molding processability at the time of extrusion or injection molding is remarkably reduced, but also the effect of quantitative physical property improvement is observed. Absent.

Further, in order to achieve the object of the present invention, an admixture acting between the brominated flame retardant and the polyamide can be used. As the admixture, a polyphenylene ether resin having an acid anhydride structure in a part of the substituent or a copolymer of styrene and maleic anhydride is particularly preferable, and when a small amount of these admixtures is used, the present invention can be obtained. When the flame-retardant polyamide resin composition is molded, a molded article having a high weld strength can be obtained, and the dispersed particle size of the bromine-based flame retardant is reduced, so that breakage and cracking during assembly of parts are improved.

The method for producing the flame-retardant polyamide composition of the present invention is not particularly limited, and a polyamide, a bromine-based flame retardant, a flame retardant aid, an alkaline earth metal compound, and an inorganic filler are commonly used in a uniaxial or biaxial manner. Using a kneader such as an extruder or kneader,
A method of melting and kneading at a temperature of 200 to 400 ° C. is exemplified. The flame-retardant polyamide composition of the present invention includes other components such as a coloring agent such as a pigment and a dye, a heat stabilizer, an antioxidant, and a weather resistance improver as long as the object of the present invention is not impaired. Additives such as a nucleating agent, a plasticizer, a lubricant and an antistatic agent, and other resin polymers can be added.

The composition of the present invention can be prepared by injection molding, extrusion molding,
It is molded into various molded products for electric, electronic, and automotive applications such as connectors, coil bobbins, breakers, holders, plugs, and switches by a known method such as blow molding.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited thereto. The raw materials and measurement methods used in the examples and comparative examples are shown below. [Raw materials] (a) Polyamide nylon 66; Leona 1300 (registered trademark) manufactured by Asahi Kasei Kogyo (sulfuric acid relative viscosity ηr = 2.8) (b) Brominated flame retardant brominated polystyrene; Pyrocheck 68P manufactured by Ferro
B <registered trademark> (c) Flame retardant auxiliary antimony trioxide; Patox C <registered trademark> manufactured by Nippon Seiko Co., Ltd. (d) Alkaline earth metal compound Calcium hydroxide: First grade reagent manufactured by Katayama Chemical Industry Magnesium hydroxide: First grade reagent manufactured by Katayama Chemical Industry Calcium carbonate: First grade reagent manufactured by Katayama Chemical Industry Magnesium carbonate: First grade reagent manufactured by Katayama Chemical Industry (d ') Other metal compounds Zinc oxide: First grade reagent manufactured by Katayama Chemical Industry (e) Inorganic reinforcement glass fiber; 03JA416 manufactured by Asahi Fiberglass Co., Ltd. [Measurement method] (1) Flame retardancy; UL94 (Under Write, USA)
rs Laboratories Inc.). The thickness of the test piece was 1 /
Injection molding machine (made by Toshiba Machine: IS50E) with 32 inches
P). (2) Heating weight decrease: 310 ° C. 30 in a nitrogen stream using a thermogravimetric device TGA40 manufactured by Seiko Electronics Industry Co., Ltd.
The weight loss of the sample when held for minutes is shown as a percentage. The smaller the thermal weight loss, the less gas is generated during molding and the less metal corrosion. (3) Mechanical properties in right angle direction Using an injection molding machine (TOSHIBA MACHINE: IS150E), 1
A flat plate of 30 mm × 130 mm × 2 mmt was formed. 13 mm x 130 mm x 2 m in the direction perpendicular to the flow from this flat plate
An mt rectangular test piece was cut out, and a bending test was performed by a method based on ASTM D790.

[0021]

Examples 1 to 5 and Comparative Examples 1 to 3 Table 1 shows (a) polyamide, (b) brominated flame retardant, (c) flame retardant auxiliary, and metal compounds (d) and (d '). After pre-mixing using a blender at the mixing ratio shown, using a twin-screw extruder (manufactured by Toshiba Machine Co., Ltd .: TEM35) at a cylinder setting temperature of 280 ° C. and a screw rotation speed of 200 rpm, the mixing ratio shown in Table 1 ( e) The inorganic reinforcing material was melt-kneaded while being side-fed, taken out into strands, cooled, and granulated with a cutter to obtain pellets. Various characteristics of the obtained pellets were examined by the above-mentioned measuring methods. The results are shown in Tables 1 and 2.

[0022]

[Table 1]

[0023]

[Table 2]

[0024]

Industrial Applicability The composition of the present invention has extremely high flame retardancy, extremely low gas generation, low mold corrosivity,
Moreover, it is a molding material having excellent mechanical properties, and can be suitably used for applications such as home electric parts, electronic parts, and automobile parts.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI C08K 3/38 C08K 3/38 C08L 25/04 C08L 25/04 25/06 25/06 25/18 25/18 63/00 63 / 00 Z 71/12 71/12 // (C08L 77/00 25:06)

Claims (6)

[Claims] (A) 30-90% by weight of a polyamide,
(B) brominated flame retardant 8 to 40% by weight, (c) flame retardant auxiliary 1
100% by weight and (d) 0.01 to 2% by weight of at least one kind of alkaline earth metal compound selected from alkaline earth metal hydroxides and carbonates. A flame-retardant polyamide composition comprising parts by weight and (e) 10 to 100 parts by weight of an inorganic reinforcing material. (B) the brominated flame retardant is a brominated polystyrene, a brominated styrene maleic anhydride polymer, a brominated polyphenylene ether, a brominated epoxy resin, a brominated crosslinked aromatic polymer, or a brominated phenoxy resin; 2. The at least one selected flame retardant.
The flame-retardant polyamide composition according to the above. 3. The method according to claim 1, wherein the flame retardant is at least one flame retardant selected from antimony oxide, sodium antimonate, tin oxide, iron oxide and zinc borate. Item 6. The flame-retardant polyamide composition according to Item 1. 4. The alkaline earth metal hydroxide is at least one selected from the group consisting of calcium hydroxide, magnesium hydroxide and barium hydroxide.
The flame-retardant polyamide composition according to the above. 5. The flame-retardant polyamide composition according to claim 1, wherein the alkaline earth metal carbonate is at least one selected from calcium carbonate, magnesium carbonate and barium carbonate. 6. The method according to claim 1, wherein (b) the brominated flame retardant is brominated polystyrene, (c) the flame retardant aid is antimony oxide, and (d) the alkaline earth metal compound is calcium hydroxide. The flame-retardant polyamide composition according to claim 1, characterized in that: