JPH0264158A - Polyarylene sulfide resin composition - Google Patents

Abstract

PURPOSE:To obtain the title composition outstanding in resistance to heat and arc, mechanical strength and the appearance of the molded product therefrom, thus suitable for electrical and electronic parts and automobile parts by incorporating a polyarylene sulfide resin with each specified amount of glass fiber, talc and magnesium hydroxide. CONSTITUTION:The objective composition can be obtained by incorporating (A) 100 pts.wt. of a polyarylene sulfide resin 5-10,000g/10min in melt flow rate with p-phenylene sulfide unit of the formula accounting for >=70mol% of the total recurring unit with (B) 20-120 (pref. 40-100) pts.wt. of glass fiber 5-20mum in fiber diameter and 1-20mm in fiber length, (C) 30-80 pts.wt. of talc 0.1-10mum in mean granular size, and (D) 10-50 pts.wt. of magnesium hydroxide with the mean granular size similar to that of the component C.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention is a resin composition characterized by containing a polyarylene sulfide resin, glass fiber, talc and magnesium hydroxide in a specific composition ratio, The present invention relates to a polyarylene sulfide resin composition with excellent arc resistance and which can provide a good surface appearance of a molded product. The composition of the present invention is used in a wide range of fields such as electric/electronic parts and automobile parts.

[Conventional technology]

Polyarylene sulfide resin, represented by polyphenylene sulfide resin (PPS resin), has advantages such as heat resistance, chemical resistance, rigidity, and dimensional stability.
In recent years, attempts have been made to develop applications for them in fields that require heat resistance and dimensional accuracy, such as electrical/electronic parts and automobile parts.

However, since this resin alone has poor impact resistance and mechanical strength, various proposals have been made regarding resin compositions in which various inorganic substances are blended with the resin in order to improve these properties. Furthermore, compositions with improved arc resistance etc. have been proposed especially for use in electrical and electronic parts and automobile parts (for example, Japanese Patent Laid-Open Nos. 53-5252 and 162752-1989). , Japanese Patent Publication No. 59-1316
Publication No. 53, etc.).

[Problem to be solved by the invention]

Those that have been proposed so far for this purpose are:
These compositions mainly contained inorganic fillers such as talc and clay, but when large molded products are molded, especially with injection molding machines, the inorganic fillers gather on the surface of the molded product, which affects the surface appearance of the molded product. It tended to get worse.

Therefore, it was desired to improve the surface appearance of the molded product while leaving properties such as arc resistance unchanged.

[Means to solve the problem]

In order to achieve the object of the present invention, as a result of intensive study of various compositions, it was discovered that the problem could be solved by blending talc and magnesium hydroxide in a specific composition, and the present invention was achieved.

That is, the object of the present invention can be achieved by containing 20 to 120 parts by weight of glass fiber, 30 to 80 parts by weight of talc, and 10 to 50 parts by weight of magnesium hydroxide to 100 parts by weight of polyarylene sulfide resin.

Polyarylene sulfide +3 used in the present invention (
From the viewpoint of heat resistance, chemical resistance, and mechanical properties, it is preferable that 70 mol% or more of the repeating units of the fat are p-phenylene sulfide units represented by the structural formula r◎S-1. If the p-phenylene sulfide unit is less than 70 mol %, heat resistance decreases, which is not preferable. The remaining components less than 30% include ◎S dimension on m-phenylene sulfide bond, diphenyl ether bond (-◎O
e) Published by Diphenylsulfone! , -h combination-f-◎S
O□◎→, biphenyl bond (-◎◎→, 〇〇s dimension above naphthyl bond, substituted paraphenylene sulfide bond (-%
S 10 (wherein R is selected from the group consisting of an alkyl group having up to 12 carbon atoms and a nitro group), a trifunctional phenyl sulfide bond, and the like.

In the present invention, a polyarylene sulfide resin having the above structure is tested at 3I5°C1 under a load of 5k using a melt flow tester specified in ASTM D 1238.
Melt flow rate measured under g conditions is 5 to 100
00g/10 minutes, preferably 15-5000g
/10 minutes is used. In addition, for applications where fluidity is particularly required, polyarylene sulfide resins with a melt flow rate of 5 to 5 under the above conditions may be used.
300g/10 minutes and 400-10000g/1
It is preferable to use a resin mixture obtained by mixing 0 minutes with 0 minutes at a weight ratio of 5/95 to 9515.

Specific examples of polyarylene sulfide resins include Rydon (trade name of PPS resin, manufactured by Phillips Vetroleum), Toprene (trade name of pps resin, manufactured by Toprene), Fortron (trade name of PPS resin, manufactured by Kureha Chemical Co., Ltd.) ), Susteel (PPStA (product name of fat),
manufactured by Tosoh Sasteel Co., Ltd.).

The glass fiber used in the present invention has a fiber diameter of 5 to 20 al.
In particular, those having a fiber length of 6 to 15 pm and a fiber length of 1.0 to 20 mm, especially 1.5 to 6 mm are preferable. Fiber diameter is 5 pm
Smaller fibers may be difficult to knead and the fibers may break easily. If the fiber diameter is larger than 20 μm, the mechanical strength of the composition will be poor. Fiber length is 1
．． If it is shorter than 0 mm, the mechanical strength of the composition will decrease. Further, if the fiber length is longer than 20 mm, kneading may become difficult.

This glass fiber is 0.0 parts per 100 parts of glass fiber.
Preferably, the surface is treated with 5 to 3 parts of a silane camping agent. Silane coupling agents include vinyl ethoxysilane, vinyl trichlorosilane, T-glycidoxypropyltrimethoxysilane, T-aminopropyltrie I xysilane, T-methacroxypropyltrimethoxysilane, N-β-( Aminosilane compounds such as (aminoethyl)-T-aminopropyltriethoxysilane and N-β-(aminoethyl)-di-aminopropylmethyljethoxysilane can be used. Further, it is preferable to use a material bound with an appropriate amount of urethane type and/or epoxy type binder.

The blending ratio of glass fiber is in the range of 20 to 120 parts by weight, preferably in the range of 40 to 100 parts by weight, per 100 parts by weight of the polyarylene sulfide resin. If it is less than 20 parts by weight, the mechanical strength will be extremely poor and it will not be practical.

Moreover, if the number is more than 120 heavy parts, it becomes brittle and cannot be put to practical use.

In the present invention, arc resistance is expressed by talc and magnesium hydroxide, and the blending ratio of talc and magnesium hydroxide is 30 to 80 parts by weight, preferably 30 to 80 parts by weight of talc to 100 parts by weight of polyarylene sulfide resin. 40 to 70 parts by weight, and 10 to 50 parts by weight of magnesium hydroxide, preferably 15 to 40 parts by weight. Furthermore, in the composition of the present invention, a preferable composition is such that the total amount of talc and magnesium hydroxide is 50 to 10 parts by weight based on 100 parts by weight of the polyarylene sulfide resin.
0 parts by weight, particularly preferably in the range from 55 to 95 parts by weight. If the amount of talc becomes too small, arc resistance will become poor. Too much talc is not suitable because the resulting composition becomes brittle. Furthermore, if the total amount of talc and magnesium hydroxide is too large, the composition may become brittle. Furthermore, if the amount of magnesium hydroxide is too small, the surface appearance of the injection molded product will be significantly deteriorated.

The talc and magnesium hydroxide used here preferably have an average particle size of 0.1 nm to 10 μl. If the average particle size is smaller than 0.1 pl, it is not preferable because the miscibility with the polyarylene sulfide resin may deteriorate, the electrical properties may become unstable, and the mechanical strength may also decrease.

Furthermore, if the average particle diameter exceeds 10 P weight, it is not preferable because the surface appearance of the molded product may deteriorate, the electrical properties may deteriorate, and the mechanical strength may also decrease.

The talc and magnesium hydroxide used here are fatty acids and their salts such as stearic acid and oleic acid, surface treatment agents such as stearyl alcohol, and/or vinyl ethoxysilane, vinyl trichlorosilane, and T-glycidoxypropyltrimethoxysilane. , T-aminopropyltriethoxysilane, T-methacroxypropyltrimethoxysilane, N-β-(aminoethyl)-γaminopropyltriethoxysilane, N-β(aminoethyl)-T-aminopropylmethyljethoxysilane In order to improve the dispersibility of the composition, it is preferable to use a material whose surface has been treated with a silane coupling agent such as silane coupling agent. The amount to be treated is preferably 0.05 to 3 parts by weight per 100 parts by weight of talc and magnesium hydroxide.

Specific examples of talc include CHC-1I P, CHC-
13P, CHC-13AO3 (manufactured by Hayashi Kasei Co., Ltd.), TAL
Examples include CKUP (manufactured by Fuji Talc Industries).

Specific examples of magnesium hydroxide include Kisuma 5A, Kisuma 5B (manufactured by Kyowa Chemical Industries, Ltd.), D5, and D7L (manufactured by Ube Chemical Industries, Ltd.).

The resin composition of the present invention contains antioxidants and heat stabilizers such as hindered phenol, hydroquinone, thioethers, phosphites and substituted products thereof, resorcinol, salicylate,
Ultraviolet absorption of benzotriazole, benzophenone, etc.
Absorbing agents, fatty acids and their salts such as stearic acid and oleic acid, mold release agents such as stearyl alcohol, antistatic agents such as sodium dodecylbenzenesulfonate and polyalkylene glycol, crystallization promoters, crystallization retarders, dyes, One or more additives such as pigments can be added.

In addition, small amounts of thermoplastic resins such as polyethylene, polypropylene, ethylene/vinyl acetate copolymer, ethylene/propylene copolymer, polystyrene, polyamide, polyester, polyacetal, polycarbonate, polysulfone, polyphenylene ether, and polyarylate,
Thermosetting resins such as phenol resins, melamine resins, silicone resins, and epoxy resins, and thermoplastic elastomers such as styrene-butadiene copolymers, hydrogenated butadiene styrene block copolymers, polyester elastomers, and polyamide elastomers. can also be added.

Furthermore, various reinforcing materials and fillers can be added as long as they do not impair the purpose of the present invention. Specific examples of reinforcing materials and fillers include asbestos) tilt fibers, carbon fibers,
Silica fiber, silica alumina fiber, alumina fiber, zirconia fiber, boron nitride fiber, silicon nitride fiber, boron fiber, stainless steel, aluminum, titanium, copper, brass,
Metal fibers such as magnesium, organic fibers such as polyamide fibers, fluororesin fibers, polyester fibers, acrylic resin fibers, copper, iron, nickel, zinc, tin, lead, stainless steel, aluminum, gold, silver, magnesium, etc. Examples include metal powder, fumed silica, aluminum silicate, glass beads, glass flakes, carbon black, quartz powder, talc, titanium oxide, iron oxide, calcium carbonate, diatomaceous earth, and mica powder. Among these, fibrous substances have an average fiber diameter of 3 to 501 and a fiber length of 50μ.
30 mm to 30 mm can be used. Further, these reinforcing materials and fillers may be surface-treated with a known silane coupling agent or titanate coupling agent.

The resin composition of the present invention can be produced using ordinary melt-kneading processing equipment such as a continuous kneader such as an extruder, or a punch-type kneader such as a Banbury mixer or a kneader. It can be processed into molded products for various uses by molding, compression molding, extrusion molding, etc.

The present invention will be explained below by way of examples.

[Example of the present invention]

Arc resistance, bending strength, and
Evaluation of the bending elastic modulus and the surface appearance of the molded product was performed by the following method.

(1) Arc resistance Tested in accordance with ASTM D 495 using an arc resistance tester manufactured by Nissho Denki Seisakusho.

(2) Bending strength, bending modulus Measured in accordance with ASTM D790.

(Unit: Kgf/cm") (3) Surface appearance of molded product A disk with a thickness of 3 mm and a diameter of 100 mm was injection molded, and the surface was visually observed.

Examples 1 to 4, Comparative Examples 1 to 6 Toprene T-4 (manufactured by Toprene), Talc 1 (average particle size 5 μl, aminosilane compound treated product), Talc 2
(average particle size 5 μm, stearic acid treated product) Magnesium hydroxide (flake form, average particle size 1.5 μm, stearic acid treated product), glass fiber (fiber diameter 13 μl, fiber length 3 mm, silane treated product) 31 at the rate shown in 1.
The mixture was put into a twin-screw kneader set at 0°C and melted and mixed to produce pellets. Various test pieces were prepared from the pellets using an injection molding machine under the conditions of a cylinder temperature of 300° C. and a mold temperature of 150° C., and evaluations were performed under predetermined conditions.

Also, without using magnesium hydroxide (Comparative Example 1),
Increase the blending ratio of magnesium hydroxide (Comparative Example 2)
, calcium carbonate (average particle size 1.8 ps) (comparative example 3), aluminum hydroxide (synthetic product, average particle size 1.5) (comparative example 4), calcium hydroxide (Nippon Lime Co., Ltd.) instead of magnesium hydroxide made, 150 mesh full pass) (
Using Comparative Example 5), and further reducing the blending ratio of glass fiber (Comparative Example 6), mixing, molding, and evaluation were performed under the same conditions to compare with the talc/magnesium hydroxide-based composition. I did it. The results are shown in Table 1.

[Effects of the present invention]

According to the present invention, there is provided a polyarylene sulfide resin composition that has sufficient mechanical strength, high heat resistance, and arc resistance, and has excellent molded product appearance and can be used in the field of electrical/electronic parts or automobile parts. can do.

Claims (1)

[Claims] For 100 parts by weight of polyarylene sulfide resin,
A resin composition containing 20 to 120 parts by weight of glass fiber, 30 to 80 parts by weight of talc, and 10 to 50 parts by weight of magnesium hydroxide.