JPS6121156A - Polyarylene sulfide resin composition - Google Patents

Abstract

PURPOSE:A polyarylene sulfide resin composition, obtained by melt incorporating a polyarylene sulfide with an alpha-olefin-glycidyl methacrylate copolymer, and having improved mechanical properties such as impact resistance, flexibility, relaxation of stress strain in molding, etc. CONSTITUTION:A polyarylene sulfide resin composition obtained by melt incorporating a polyarylene sulfide with an alpha-olefin-glycidyl methacrylate copolymer and if necessary a filler. The alpha-olefin-glycidyl methacrylate copolymer preferably has 0.5-30wt%, preferably 3-15wt% content of glycidyl methacrylate, and ethylene or propylene is used as the alpha-olefin. The amount of the above-mentioned copolymer to be incorporated is 5-90pts.wt. based on 100pts.wt. polyarylene sulfide.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a polyarylene sulfide resin composition having improved mechanical properties. Impact resistance, flexibility, made by blending α-olefin-glycidyl methacrylate copolymer with polyarylene sulfide,
Improved mechanical properties such as relaxation of stress and strain during molding.
The present invention relates to a polyarylene sulfide resin composition.

(Conventional technology and problems) Polyarylene sulfide is attracting attention as a high-performance engineering plastic that has superior heat resistance, chemical resistance, and rigidity compared to engineering plastics such as nylon, polycarbonate, polybutylene terephthalate, and polyacetal. . However, this resin has a serious drawback in that it has poor ductility compared to the above-mentioned engineering plastics, and has a ductility of just under 11 ik. In recent years, linear polyarylene sulfide, which is different from conventional thermally crosslinked polyarylene sulfide, has been developed, but even in this case, it has poor toughness in the crystallized state.

Conventionally, fillers such as glass fibers have been added to polyarylene sulfide to improve its impact resistance, but this has not been sufficient, especially for applications that require flexibility or when sealing electronic components. It is not effective in preventing the occurrence of stress strain. On the other hand, polymer blending with flexible polymers is an effective method, but there are few polymers that are flexible and have excellent heat resistance and chemical resistance, and the compatibility with polyarylene sulfide is insufficient. Polyarylene sulfide with improved impact resistance and flexibility without sacrificing its characteristics has not yet been obtained.

(Means for Solving the Problems) In view of the above circumstances, the present inventors have made efforts to obtain a polyarylene sulfide resin composition that has improved mechanical properties and less decreases in heat resistance and chemical resistance. As a result of studies, it was discovered that it is effective to melt-mix an α-olefin-glycidyl methacrylate copolymer with polyarylene sulfide, leading to the present invention.

That is, the present invention provides a polyarylene sulfide resin composition, which is formed by melt-mixing polyarylene sulfide, an α-olefin-glycidyl methacrylate copolymer, and, if necessary, a filler. be.

In the present invention, the polyarylene sulfide is uncrosslinked or partially crosslinked polyarylene sulfide and mixtures thereof, and is ASTM method I)-1231174 (315,
The melt flow rate measured at 5℃ and 5kg load is 1.
It has a molecular weight of 0 to 10,000 g/10 minutes, and various molecular weights are used depending on the purpose. Examples of the polyarylene sulfide include copolymerized phenyl and alkoxy groups) and known polyphenylene sulfides containing at least mol% of trifunctional phenyl sulfides.

Further, the glycidyl methacrylate content in the α-olefin-glycidyl methacrylate copolymer used in the present invention is usually 0.5 to 30% by weight, preferably 1 to 2% by weight.
0% by weight, particularly preferably 3 to 15% by weight. If the content is less than 0.5% by weight, the effect of improving the affinity between polyarylene sulfide and the copolymer cannot be exhibited, and if it exceeds 30% by weight, the copolymer itself loses flexibility, so the composition The impact resistance, flexibility, etc. of the object are not improved. Typical α-olefin components used in this copolymer are ethylene, propylene, etc., and may further contain small amounts of other copolymer components such as butene-1.

The above α-olefin-glycidyl methacrylate copolymer is based on 100 parts by weight of polyarylene sulfide,
Usually 1 to 120 parts by weight, preferably 5 to 90 parts by weight. If the amount is less than 1 part by weight, the mechanical properties of the polyarylene sulfide composition such as impact resistance, flexibility, relaxation of stress strain during molding will not be sufficiently improved, and if it exceeds 120 parts by weight, the polyarylene sulfide composition will not be sufficiently improved. The original heat resistance, chemical resistance, and rigidity are significantly reduced.

Fillers used as needed in the present invention include known fibrous reinforcing agents such as glass fiber, carbon fiber, potassium titanate fiber, asbestos, silicon carbide fiber, ceramic fiber, metal fiber, and silicon nitride fiber, and sulfuric acid. Barium, calcium sulfate, kaolin, clay, pyrophyllite, bentonite, sericite, zeolite, mica,
Mica, nephelinsinite, talc, attalpulgite, wollastonite, PMF, ferrite, calcium silicate, calcium carbonate, magnesium carbonate, dolomite, antimony trioxide, zinc oxide, titanium oxide, magnesium oxide, iron oxide, molybdenum disulfide Known inorganic fillers include graphite, gypsum, glass beads, glass balloons, glass powder, and silica, and are usually used in an amount of 0 to 1000 parts by weight per 100 parts by weight of polyarylene sulfide depending on the intended use. Add as appropriate.

There is no particular restriction on the method of melt-mixing the polyarylene sulfide and the α-olefin-glycidyl methacrylate copolymer in the presence or absence of a filler in the present invention, but for example, they may be mixed in an extruder or an injection molding machine. Melt mixing can be performed using Note that the atmosphere during melt-mixing can be under reduced pressure, under an inert gas, or in the presence of an oxygen-containing gas.

The polyarylene sulfide resin composition of the present invention may include other known polymers, such as polyamides, polyesters, polyolefins, etc., as long as the object of the present invention is not impaired.
Polyphenylene oxide, polyimides, polysulfones, polycarbonates, etc. can be melt-mixed, and also mold release agents, lubricants, colorants, heat stabilizers, ultraviolet absorbers,
Foaming agents, rust inhibitors, silane coupling agents, titanate coupling agents.

It is possible to add known additives such as.

In addition, for the purpose of enhancing the effects of the present invention, various known epoxy resins such as bisphenol-type epoxy resins, alicyclic epoxy resins, and novolak-type epoxy resins can be added to the composition of the present invention.

(Effects of the Invention) The polyarylene sulfide resin composition of the present invention has excellent impact resistance, flexibility, and
Mechanical properties such as relaxation of stress strain during molding have been improved, and it is possible to perform not only injection molding and compression molding, but also extrusion molding, blow molding, foam molding, transfer molding, etc., as well as film, sheet, monofilament, It can be formed into fibers, etc.

It can also be used for sealing electronic components, which has been attracting attention recently.

(Example) The present invention will be specifically described below with reference to Examples. Note that all parts and percentages in the examples are based on weight.

Examples 1 to 4 and Comparative Example I Ethylene-glycidyl methacrylate copolymer with a glycidyl methacrylate content of 10% based on 100 parts of polyphenylene sulfide having a melt flow rate of 140 g/10 min as measured by ASTM D-1238-74. were used in the proportions shown in Table 1 below, glass fibers were added in a proportion such that the glass fiber content in the composition was 30%, and the mixture was melt-mixed in a twin-screw extruder at 320°C and pelletized to produce polyphenylene sulfide resin. Pellets of the composition were obtained. This pellet is heated at a cylinder temperature of 310℃ and a mold temperature of 1.
Test specimens for measuring physical properties were obtained by injection molding at 30°C, and the Izot impact strength (measured according to ASTM D-256, without notches) and flexural modulus (ASTM D-790) were obtained.
(measured in accordance with ASTM D-64), heat distortion temperature (ASTM D-64
Measured according to 8, but load 18.6kg/cI
a) was measured. The results are shown in Table 1.

Examples 5 to 8 and Comparative Example 2 Ethylene-glycidyl methacrylate copolymer containing 5% glycidyl methacrylate was added to 100 parts of polyphenylene sulfide having a melt flow rate of 50 g/10 min in the proportions shown in Table 2 below. The mixture was melt-mixed in an extruder at 295° C. and pelletized to obtain pellets of a polyphenylene sulfide resin composition. These pellets were injection molded at a cylinder temperature of 300°C and a mold temperature of 130°C to obtain test pieces for measuring physical properties.
D-638) was measured. Second result
Shown in the table.

Examples 9 to 12 and Comparative Example 3 15 parts of ethylene-glycidyl methacrylate copolymer having a glycidyl methacrylate content shown in Table 3 below, spherical silica [ 150 parts of FB-901 manufactured by Denki Kagaku ■ and 50 parts of glass fiber were added, melt-mixed in an extruder at 300°C, and pelletized to obtain pellets of a polyphenylene sulfide resin composition. This pellet is heated to a cylinder temperature of 290℃ and a mold temperature of 150℃.
Test specimens for measuring physical properties were obtained by injection molding at
D-790) was measured. The results are shown in Table 3.

Table 3 Examples 13 to 14 and Comparative Example 4 Propylene-glycidyl methacrylate copolymer having a glycidyl methacrylate content of 10% was added to 100 parts of polyphenylene sulfide having a melt flow rate of 650 in the proportions shown in Table 4 below. In addition, the mixture was melt-mixed in an extruder at 310°C and pelletized to obtain pellets of a polyphenylene sulfide resin composition. This pellet was injection molded under the conditions of a cylinder temperature of 320°C and a mold temperature of 80°C to obtain a test piece for measuring physical properties, and the film strength (notched) was measured. The results are shown in Table 4.

Table 4

Claims (1)

[Claims] A polyarylene sulfide resin composition comprising a polyarylene sulfide, an α-olefin-glycidyl methacrylate copolymer, and, if necessary, a filler.