JPH0229460A - Polyarylene sulfide resin composition - Google Patents

Abstract

PURPOSE:To obtain the title composition improved in mechanical strengths, heat resistance, flexibility, etc., by mixing a polyarylene sulfide with a poly-p- phenylene.3,4'-diphenyl ether.terephthalamide fiber. CONSTITUTION:50-99.5wt.% polyarylene sulfide of a melt viscosity of 100-10,000 P is melt-kneaded with 0.5-50wt.% poly-p-phenylene.3,4'-diphenyl ether.terephthalamide fiber and, optionally, a reinforcement, a filler (e.g., glass fiber), etc.

Description

Detailed Description of the Invention <Industrial Application Field> The present invention is a polyarylene sulfide and polyparaphenylene/3,4'-diphenyl ether/terephthalamide fiber with improved mechanical properties such as impact resistance and flexibility. The present invention relates to a resin composition.

<Prior art> Polyarylene sulfide is a crystalline polymer that has superior heat resistance, flame retardancy, chemical resistance, and regularity compared to engineering plastics such as nylon, polycarbonate, polybutylene terephthalate, and polyacetal. . However, this resin has serious drawbacks of poor ductility and brittleness compared to the above-mentioned engineering plastics.

Linear polyarylene sulfide, which is different from the recent thermally crosslinked polyarylene sulfide, has recently been developed, but even when this polymer is used, it has poor toughness in the crystallized state.

Furthermore, in order to improve the toughness of polyarylene sulfide, fillers made of inorganic fibers such as glass fibers and asbestos fibers and inorganic particles such as talc have been added. However, even with the addition of these inorganic reinforcements, the impact resistance is still low compared to Ike's engineering plastics.

Polymer blending of resin compositions with flexible polymers such as elastomers is an effective method, but
It has not been possible to obtain polyarylene sulfide with improved impact resistance without sacrificing the characteristics of polyarylene sulfide due to the lack of polymers with poor heat resistance and chemical resistance and insufficient compatibility with polyarylene sulfide. .

Therefore, a method of improving the toughness of polyarylene sulfide by using polyparaphenylene terephthalamide fiber, which is an organic fiber with excellent mechanical strength and heat resistance, in place of the inorganic filler (Japanese Patent Laid-Open No. 56-4654) ) was proposed.

However, in this method, Banbury mixer
Because batch-type mixing equipment such as There are many problems in production.

<Problems to be Solved by the Invention> The present inventors studied a blended composition of polyarylene sulfide and polyparaphenylene terephthalamide fibers. When polyarylene sulfide and polyparaphenylene terephthalamide fibers were continuously melt-kneaded in an ordinary extruder, the improvement in mechanical strength of the composition was small due to the cutting of the m+ fibers in the cylinder. Almost no improvement effect was observed in the toughness of the material. Polyparaphenylene terephthalamide fiber is produced by extrusion molding or injection molding polyarylene sulfide resin.
It is known that mechanical strength decreases considerably due to thermal deterioration when exposed to temperatures of 00°C or higher for a certain period of time. Therefore, it can be said that it is inappropriate to mix polyparaphenylene terephthalamide fibers with high-performance engineering plastics that require high melt processing temperatures for the purpose of improving mechanical strength.

Means for Solving the Problems> Therefore, in view of the above-mentioned situation, the present inventors have determined that the mechanical strength can be improved even when melt-kneaded using an extruder such as a single-screw extruder or a multi-screw extruder. In order to obtain a polyarylene sulfide resin composition with improved heat resistance, flexibility, etc., we have conducted intensive studies. As a result, when polyparaphenylene, 34°-diphenyl ether, and terephthalamide fibers were melt-kneaded with polyarylene sulfide using an extruder, they surprisingly found that although they were the same fully aromatic polyamide fibers, they had poor mechanical strength, especially durability. The inventors have now discovered that a resin composition with significantly improved impact properties can be obtained, and have thus arrived at the present invention.

That is, the present invention uses polyarylene sulfide 50-9
9.5% by weight and polyparaphenylene/3,4'-diphenyl ether/terephthalamide fiber 015-50% by weight
It is a polyarylene sulfide resin composition consisting of.

The polyarylene sulfide used in the present invention is uncrosslinked or partially crosslinked polyarylene sulfide and mixtures thereof. If it is possible to obtain a molded product, there is no particular limit to the melt viscosity of the polyarylene sulfide, but the toughness of the polymer itself requires 100 poise or more, and the moldability requires a viscosity of 10,000 poise or more. Poise or less is more preferably used. Note that the polyarylene sulfide may contain a meta-linkage group, nitro, phenyl, alkoxy group, etc. as a copolymerization component. Typical polyarylene sulfides preferably used in the present invention include - formula ()
Examples include known polyphenylene sulfides containing 90 mol% or more of the structural unit represented by s-.

The polyparaphenylene 34'-diphenyl ether terephthalamide fiber used in the present invention can be prepared, for example, in a polar aprone organic solvent with 50 mol% of terephthaloyl chloride, 25 mol% of P-phenylenediamine and 3,4'-
Obtained by reaction of 25 mol% of diaminodiphenyl ether. Details of this manufacturing method are disclosed in, for example, Japanese Patent Publication No. 54-43612.

The resin composition of the present invention contains polyarylene sulfide 50 to
99.5% by weight (preferably 70-99% by weight) and polyparaphenylene 3,4'-diphenyl ether.
It is composed of terephthalamide fibers in an amount of 0.5 to 50% by weight (preferably 1 to 30% by weight). When the amount of polyparaphenylene/3,4°-diphenyl ether/terephthalamide is less than 0.5% by weight, the effect of improving impact resistance due to the addition of aramid fibers is hardly exhibited. Also 5
If it exceeds 0% by weight, melt-kneading in a normal single-screw or multi-screw extruder becomes difficult.

The resin composition of the present invention may include other ingredients such as pigments, dyes, reinforcing materials, fillers, heat resistant agents, antioxidants, weathering agents, lubricants, crystal nucleating agents, etc., as long as they do not impair its moldability and physical properties.
Mold release agents, plasticizers, flame retardants, antistatic agents, other polymers, and the like can be added and introduced. Addition of reinforcing materials and fillers is particularly important, and fibrous or powder reinforcement such as glass fiber, asbestos fiber, carbon fiber, graphite fiber, wollastenite, talc, calcium carbonate, mica, clay, potassium titanate whiskers, glass peas, etc. Materials can be added and blended.

The method for producing the resin composition of the present invention is not particularly limited, and polyarylene sulfide and polyparaphenylene 3,4°-
An example is a method in which diphenyl ether terephthalamide fibers are supplied to a single-screw or multi-screw extruder with or without premixing and then melt-kneaded.

The resin composition of the present invention can be used for injection molding, extrusion molding, blow molding,
Molded products with excellent physical properties can be obtained by subjecting them to compression molding and other molding methods used for normal thermoplastic resins.These molded products are used in various automotive parts, mechanical parts, electrical/electronic parts, and general miscellaneous goods. It is useful as such.

<Example> The present invention will be explained in more detail with reference to Examples below.

The characteristics of the polymers and molded articles described in the Examples and Comparative Examples were evaluated by the following method.

(1) Tensile properties: ASTM D638 (2) Bending properties: ASTM D790 (3) Izot WIS strength: ASTM D256 (4) Heat distortion temperature: ASTM
D648 Examples 1 to 5 Polyarylene sulfide (manufactured by Topren).

Toprene T-4. Melt viscosity 2580 poise (300℃
.

Unbound polyparaphenylene/3,4-diphenyl ether terephthalamide fiber (Teijin Co., Ltd. "Technora ■") was made with a cutting speed of 6950 (-1)) and a sizing agent ("Plus Coat Z3308J" manufactured by Gooh Kagaku Kogyo Co., Ltd.). 3 ++
After premixing chopped strands cut into lengths of m in various proportions, the mixture was melt-kneaded at 310° C. using a twin-screw extruder to form pellets. After drying, the pellets were injection molded at a cylinder temperature of 310°C and a mold temperature of 130°C to form test pieces for measuring various physical properties, and basic physical properties were measured. The results were as shown in Table 1. It was found that the improvement in mechanical strength, especially impact resistance, was remarkable. It was also found that the elongation at break was improved, indicating that the flexibility was improved.

Comparative Example 1 Only the polyarylene sulfide used in Examples 1 to 5 was extruded, kneaded and molded in the same manner, and its basic physical properties were measured. The results are also listed in Table 1.

Comparative Examples 2 to 5 No sizing agent was used except that polyparaphenylene terephthalamide fiber (“Kevlar ■” 49 manufactured by DuPont) was used instead of polyparaphenylene/34°-diphenyl ether/terephthalamide fiber in Examples 1 to 5. The chopped strands were kneaded and molded under the same conditions as in Examples 1 to 5, including the cut length, and their basic physical properties were measured. The mechanical strength was generally lower than that of the examples, and there was a particularly noticeable difference in impact resistance.

<Effects of the Invention> The polyarylene sulfide resin composition of the present invention has excellent W resistance.
Mechanical properties such as impact resistance and flexibility have been significantly improved.

Claims (1)

[Claims] A polyarylene sulfide resin composition comprising 50 to 99.5% by weight of polyarylene sulfide and 0.5 to 50% by weight of polyparaphenylene/3,4'-diphenyl ether/terephthalamide fiber.