JPS5911357A - Polyphenylene sulfide resin molding material - Google Patents

Abstract

PURPOSE:To provide the titled resin molding material which gives moldings having improved weld strength, containing two kinds of polyphenylene sulfide resins having different melt flow rate, an inorg. filler and glass fiber. CONSTITUTION:A polyphenylene sulfide (PPS) resin molding material for use in compression and injection molding contains two kinds of PPS resins having different melt flow rate, an inorg. filler and glass fiber, one of PPS resins having a melt flow rate (300 deg.C, a load at 5,000g) of 5-100 and the other having a melt flow rate of 500 or above. Pref. 95-35wt% blend consisting of 99-66wt% PPS resin having a melt flow rate of 5-100, 0.5-20wt% PPS resin having a melt flow rate of 500 or above and 0.5-20wt% inorg. filler is blended with 5-70wt% glass fiber from the viewpoints of flow characteristics during molding in compression or injection molding and the mechanical strength of moldings.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a polyphenylene sulfide 4i4 resin molding material for compression molding type or injection I-shaped molding. The present invention relates to a holophenylene sulfide resin molding material containing an agent and glass fiber.

Although polyphenylene sulfide resin (hereinafter referred to as pps resin) is a thermoplastic resin, it has the properties of a thermosetting resin that can be cured by heating, etc., and can be used with polycarbonate, nylon, saturated polyester, and other engineering materials. Extremely high rigidity compared to plastic
It is known as an engineering plastic with excellent heat resistance, chemical resistance, flame resistance, and electrical properties. pp
Since S resin alone has low elongation and is brittle, it is used as a molding material in the form of P, which is reinforced by filling it with glass fiber.
PS resin resin molding materials are used for various molding purposes.

However, during compression molding or injection molding, such glass fiber-filled pps resin molding materials cannot be used for fik,
In the engraving mold, the melt layer at the weld part, which is the ninth point of the flow of molding material, is easily damaged and the molded product breaks from the weld part due to thermal stress and mechanical stress, so-called weld failure. It has the disadvantage of being low. In particular, when manufacturing a molded article with a rough shape by secondary processing such as ultrasonic welding, there is a problem that breakage from the weld portion increases significantly.

Conventionally, measures have been taken to avoid this drawback by improving the design of molds used for compression molding or injection molding. However, P
The excellent properties of PS resin require support for molded products with even more diverse and complex shapes, and it is no longer possible to overcome the drawbacks by improving molds.

On the other hand, improvements have been made to PPS resin molding materials, and studies on compounding agents or fillers have progressed, and the compounding agents are Fe2O2
Molding materials using paulownia materials are commercially available, but although molded products made of paulownia materials have improved weld strength, they have low tensile strength, and Fe2O2 has the disadvantage that it discolors many times due to the influence of heating. Not suitable for use in humid locations. Regarding the diameter of the glass fiber used as a filler, there is a proposal to improve the weld strength by reducing the diameter, but it has not been found to have any significant effect.

The present inventor conducted Umeme grinding and inspection in order to recognize such problems. As a result, PPS resin is composed of two types with different melt flow rates, and PPS resin molding materials containing inorganic fillers and glass fibers have improved fluidity during molding, resulting in υ molded products. It has been found that the above-mentioned problems can be solved by improving the weld strength and without impairing the properties peculiar to PPS resin.

That is, the present invention provides a polyphenylene sulfide resin molding material for compression molding or injection molding, in which the polyphenylene sulfite resin in the molding material has a melt flow rate (300°C, load 5ooor) of 5 to 00 and 5.
The present invention relates to a polyphenylene sulfide resin molding material containing two types of 0.00 or more, an inorganic filler, and glass fiber. In the pps resin molding material of the present invention, the PPS resin is tested at 300°C and a load of 5000F using a melt indexer specified in ASTM D 1238-70T.
Melt flow rate measured under the conditions of 5 to 100 (
y/10 min) (hereinafter referred to as PP5-A) and 5oo (
r/]0 minutes) or above (hereinafter referred to as PP5-B). The above range of melt flow rate,
As is clear from the comparison between Examples and Comparative Examples shown later, the formulation of the two types of PPS resins shown in the box improves the processability during molding, that is, the fluidity, so the melting of the resin in the weld part is improved. The adhesion is completed completely, and the mechanical strength such as the weld strength of the molded article can be improved in addition to the effect of the filler compounding. If the melt flow rates of the two types of PPS resins deviate from the above range, the fluidity during molding will not be improved, and therefore the mechanical strength of the molded product will not be improved.

PPS resins are commercially available. That is, the pps resin is 1 Rydon'P from Phillips Petroleum Company of the United States.
The one produced under the trade name PS is widely known. There are various types of 7 Ryton' PPS depending on the degree of crosslinking, and the PP5-A of the present invention is P-
4 (powder) L/-t, p P S -B r6: v
-1, P-2, P-3, and P-6 (Izuwamo powder) grades can be used.

By blending PP5-A and PP5-B, fluidity is improved, so it becomes possible to mix a large amount of filler. Inorganic fillers are preferably used as such fillers. The inorganic filler is not particularly limited, but it is preferably one that does not decompose or emit smoke when heated during molding, and does not affect the molded product due to hygroscopicity or deterioration over time. Examples of inorganic fillers include carbonates such as calcium charcoal, magnesium carbonate, barium sulfate, and calcium sulfate, sulfuric acids, and metal tung oxides such as copper oxide, zinc oxide, titanium oxide, magnesium oxide, and alumina. In addition, silica, graphite, holonitride, cruzi, clay, etc. can be used.

The inorganic filler is finely pulverized into a powder bed shape (σ),
Alternatively, scale-like materials are preferable in terms of fluidity and mechanical strength. The number of inorganic fillers is not limited to one per unit, and it is also possible to use 2S or more in combination.

The PPS resin molding material of the present invention is PP5-A, P1? S-
B. The inorganic filler formulation is filled with glass fibers.

Glass glue is essential for improving the mechanical strength of molded products formed by thermoplastic resin molding. Any glass fiber that is commonly used for reinforcing such Karasujin fiber P ps resin may be used, and various types of glass fibers such as commercially available E glass, 0 glass, S glass, and A glass can be used. The form of the glass fibers may be chopped strands, rovings, milled fibers, etc., but if they are long fibers or are used in excess, the fluidity of the tit molding material will be reduced, so it is not suitable. The glass fiber at the time of compounding is preferably 1l-1 diameter 5-2 (1 micron, length) 05-1
(approximately 0 strands) k, with a fine tube (with a wall diameter of 13 microns and a length of 3 mm).
Surface bonding treatment may be performed using a known silane coupling agent or sizing agent such as mercaftosilane, and these treatments improve workability during molding and improve the surface properties of the molded product. , Tr+ 5 characteristics are made white clay.

PP5-A, PP5-B, nothing? The blending ratio of the senjiro agent and the tunorasu fiber is limited to the one used in beef.
From the viewpoint of I characteristics and the integrity of the molded product, the appearance is unfavorable.
20 weight i = %, inorganic) 1) Clay agent 05-207ii
%%, and it is appropriate to mix 444% by weight of Crow Thin #15-70 for 95-30 weight. In particular, it is preferable that the weight of the glass fibers be 35 to 451% by weight for the weight of PP61-A, PP5-B, and the inorganic filler. In terms of convenience, C.--, these compounded preparations 41J contain a large amount of inorganic filler and a small amount of glass fiber. ii j
In your relationship with JJ, it is better to go beyond the necessary and sufficient introduction.

A known method can be used for mixing these. For example, PP5-A, PP5-B, and an inorganic filler are mechanically mixed uniformly using a mixing rod (C) such as a Henschel mixer to obtain a premix, and then the premix is mixed with a glass fiber feeder in a single unit. The mixture is put into a kneading extruder with two screws, heated to 300 to 40°C, melted, mixed, and cooled (11) It can be made into a molding phase material by pelletizing.

The molding material of the present invention can be used in combination with other thermoplastic resins or VJ thermothermizable resins in addition to PPS resin without departing from the purpose of the present invention.

Examples of such resins include known resins such as polyethylene, polypropylene, polystyrene, polyvinyl chloride, methacrylic resin, polyurethane, polyamide, polycarbonate, fluororesin, polyamitoimide, epoxy resin, and silicone resin. You can get rid of the fat. still,
In addition, reinforcing agents such as carbon cord, potassium titanate, asbestos, silicon carbide, etc. may be used in the cuff supply, and in addition, lubricants, lubricants, coloring agents, stabilizers, etc.
It is possible to use foaming agents, mold release agents, antioxidants, etc.

Since the molding material of the present invention contains an appropriate amount of inorganic filler and glass fiber, the appearance of pellets and molded products does not lose the deliciousness that conventional molding materials lack.

However, because the flow during molding 1 = j: force - 1, conventionally,
There will be no uneven distribution of fillers, compounding agents, or reinforcing agents, which causes trouble for the gods. As is clear from the comparative examples shown later, the mechanical strength of the molded product molded with the molding material of the present invention, that is, the weld blast strength and tensile strength, is higher than that of the conventional pps resin molding material phase. It is something that you have.

The molding material of the present invention can be molded by conventional compression molding or injection molding. The molding conditions are not particularly limited, and the molding is carried out under normal conditions. The molding material of the present invention can be used to create molded products with complex shadow shapes, which have conventionally had low mechanical strength and made it difficult to use PPS resin molding materials. Enables the production of molded products. The molding material of the present invention can be used for vehicle applications, electrical machinery appliances, electronic machinery appliances, office machinery appliances, chemical machinery appliances,
Parts of boats and other mechanical equipment, such as plates, rods,
It can be used in a wide range of applications as engineering plastics such as pipes, containers, and gears.

The method for evaluating the molding material of the present invention is as follows. That is,
The bath melt viscosity was measured at a temperature of 300° C. using a Koka type flow tester (manufactured by Shimadzu Corporation). The mechanical strength of the molded product is determined according to JIS-7] 131/C-r test piece was made of PA, and the tensile weld strength and tensile strength were measured using a Tensilon 1 tensile tester (manufactured by Toyo Holdwin Co., Ltd.). did. The test molded product was molded by injection molding, and the conditions were: molding temperature: 340°C, average residence time: 2
．． It's 5 minutes.

The present invention will now be explained in more detail with reference to Examples, but the invention is not limited to these Examples.

Example 1 "Rydon' PP5P-4 grade (
Melt flow rate actual value 100 or more), PP5-B
1 Rydon" PP5V-1 grade (measured melt flow rate approx. 1500) (all manufactured by Phillips Vetroleum, Inc. in the United States) and calcium carbonate as an inorganic filler at a ratio of 52/5/3 parts by weight. A premix was obtained by mixing in a mixer. To this premix, 40 parts by weight of chopped nutrant O8-03-λ4A-497゛ (length 3, manufactured by Asahi Fiberglass Co., Ltd.) was added as glass fiber, and the screw diameter was adjusted. 40
The mixture was put into a tmnl single-screw kneading extruder and extruded at a cylinder and die temperature of 320°C and a screw rotation of 30 revolutions per minute to create pellets. This pellet was molded using an injection molding machine at a cylinder swirl layer of 340°C and a mold temperature of 120°C to obtain a molded product. The obtained molded product is JIS-
A strength test piece was prepared according to 7] 13, and the tensile weld strength and tensile strength were measured using a tensile tester. Separately, melt viscosity was measured using a flow tester.

The measurement results are shown in Table 1.

Examples 2 to 4 Pellets and molded products were created in the same manner as in Example 1, except that the blending ratios of PP5-A, -B and calcium carbonate in Example 1 were changed to the blending ratios shown in Table 1. Tensile weld strength, tensile strength and bulk melt viscosity were measured.

The measurement results are shown in Table 11.

Examples 5 to 12 All pellets and molded products were prepared in the same manner as in Example 1, except that the calcium carbonate as the non-nuclear filler in Example was changed to the inorganic filler shown in the second layer, and tensile welding was performed. Strength, tensile strength and melt viscosity were measured.

The measurement results are shown in Table 2.

Comparative Examples 1 to 5 Pellets and molded articles were prepared in the same manner as in Examples using the formulations and proportions shown in Table 3, and their tensile cold strength, tensile strength, and melt viscosity were measured.

The measurement results are shown in Table 3.

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Claims (2)

[Claims] (1) In a polyphenylene pulfite resin molding material for compression molding or injection molding, the polyphenylene sulfide resin in the molding material has two types of melt flow rate (300°C, load 5000 f): 5 to 100 and 500 or more. , a polyphenylene sulfide resin molding material containing an inorganic filler and glass fiber. (2) A blend of polyphenylene sulfide resin with a melt flow rate of 5 to 100 in an amount of 99 to 60%, a melt flow rate of 500 or more in an amount of 05 to 20% by weight, and an inorganic filler of 05 to 20% by weight, 95 to 30%. 2. The molding material according to claim 1, which contains heavy fibers and 5 to 70 glass fibers.