JP2706651B2 - connector - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved connector. More specifically, the present invention relates to an improved polyarylene sulfide resin connector which is free of burrs during injection molding, has a high strength in a weld portion, and is strong against terminal press-fitting into a hole. 2. Description of the Related Art In recent years,
The development of the electronics industry is remarkable,
For the purpose of cost reduction and multi-functionalization, high density and miniaturization of components and chips are being pursued. In other words, starting with the high integration of ICs as active components, miniaturization of capacitors, resistors, coils and the like as passive components, chipping, and miniaturization of connectors as structural components are being promoted. The mounting substrate on which this is mounted is also in the direction of fine patterning, and at the same time, these components are directly exposed to the solder melting temperature due to changes in the mounting method, so that the component materials have heat resistance characteristics, dimensional accuracy, electrical characteristics, mechanical characteristics. There is a demand for a higher level such as the target strength and the like, and at the same time, a reduction in manufacturing cost. The connector targeted by the present invention is:
It is a connector for electrically and / or mechanically connecting at least two components among electrical device components, electronic device components, circuits, and the like. It consists of two parts with several opposing electrodes insulated from each other, which interrupt the electrical connection by insertion and removal. There are many types of electrodes, from 2 to more than 100, and some have complicated shapes. The high level demands described above have been made for this connector due to changes in the mounting method. For this reason, it is difficult to satisfy the requirements with existing materials,
Changes to higher performance materials are being forced. Polyarylene sulfide resin is one of the resins that meets this requirement. However, this resin has a disadvantage that the mechanical properties of a portion where two or more flowing ends of the resin merge and fuse in the mold cavity during injection molding, that is, a weld portion, have extremely low mechanical properties. Since connectors have a large number of terminal connection holes due to their structure, it is difficult to prevent the occurrence of a weld during molding, and there is a problem that the connector is broken from the weld when the pins are driven. In addition, polyarylene sulfide resin has a good flowability, and has a problem that burrs are generated in a completed molded product by entering into a small gap between dies to be joined at the time of molding. A great deal of effort is required to obtain a normal part shape by removal, which is not economically preferable. [0003] Among these problems, the following are generally known as attempts to improve the mechanical properties of the weld portion. (1) Improve the mold design. For example, a cold slag well is put on and removed after cooling. Alternatively, the number of gates is increased so that the material temperature does not decrease at the fusion point. Or change the position of the gate. (2) Drill holes in necessary parts by post-processing to prevent weld formation at the time of molding. (3) Use a composition having improved flow characteristics. (Japanese Patent Laid-Open No. 59
No. -11357, JP-A-59-11358, JP-A-57-70157) (4) Use of an inorganic filler having an effect of improving weld strength (JP-A-57-70157) However, in these methods, Each has its own problems.
That is, the methods (1) and (2) cannot be applied to a connector having a large number of small holes and a large number of welds.
The method (3) has an effect of improving the weld strength, but has insufficient strength. On the contrary, it has a problem that the burr becomes large, and it is difficult to apply the method to a connector. (4) is limited in its application because the mechanical properties of the molded article are reduced, and it is difficult to apply it to a connector having a thin portion. The following are known as attempts to reduce burrs raised as another problem. (1) Improve the mold design to improve the accuracy and reduce the clearance of the parting line of the mold. (2) Respond with molding conditions. Injection speed, holding pressure, resin temperature and mold temperature during injection molding are kept as low as possible within the moldable range. (3) Use a material with low fluidity. However, the method (1) has a problem that the clearance of the parting line increases in proportion to the use time of the mold and the burr increases.The method (2) has a problem that the molding range is narrow and the operating conditions are limited. There is a problem that a slight change causes molding failure such as a short shot. In addition, the method (3) does not have a sufficient burr reduction effect and also has a weak weld strength. For this reason, particularly in a connector having a large number of holes, the applicable range is limited, and a sufficient effect cannot be obtained. The present inventors believe that in order to improve the weld strength of a connector made of a polyarylene sulfide resin and reduce the occurrence of burrs, it is necessary to improve the material thereof. As a result of examining connectors containing various additives, as a material for forming a connector, a connector formed using a material obtained by adding a specific silane compound to a polyarylene sulfide resin has changed solidification and crystallization characteristics, In addition to improving the mechanical properties by improving the fusion state of the resin at the weld part during connector molding, the viscosity characteristics of the composition have also been improved, and the melt viscosity in the low shear rate range has increased significantly, resulting in the formation of burrs. The present invention has been found to reduce the occurrence and to economically mold a connector having a particularly large number of complicated holes. That is, the present invention relates to a connector obtained by injection molding a composition comprising (A) 100 parts by weight of a polyarylene sulfide resin and (B) 0.01 to 5 parts by weight of an epoxyalkoxysilane (C) 0 to 400 parts by weight of an inorganic filler. Is provided. DETAILED DESCRIPTION OF THE INVENTION The polyarylene sulfide resin (A) serving as the base of the connector material in the present invention has the general formula: ## STR1 ## (Where Ar is an aryl group) is a polymer or a copolymer having a repeating unit of 70 mol% or more, and a typical substance is a structural formula: ## STR2 ## A polyphenylene sulfide or a copolymer thereof having a repeating unit of at least 70 mol%. Among them, the melt viscosity measured at a temperature of 310 ° C. and a shear rate of 1200 / sec is 10 to 20000 poise, especially 100 to 5000 poise.
Those in the poise range are suitable. As the base resin used as the material of the connector of the present invention, other thermoplastic resins can be used in a small amount in addition to the polyarylene sulfide resin or its copolymer depending on the purpose. The other thermoplastic resin used here may be any thermoplastic resin that is stable at high temperatures. For example, aromatic polyesters such as polyethylene terephthalate and polybutylene terephthalate and aromatic dicarboxylic acids and diols or oxycarboxylic acids, polyamides, polycarbonates, polyphenylene oxides, polyalkyl acrylates, polysulfones, polyethersulfones, polyetherimides, polyethers Ketone, fluororesin, polyoxymethylene and the like can be mentioned. These thermoplastic resins can be used as a mixture of two or more kinds. The connector material composition of the present invention contains an epoxyalkoxysilane as component (B).
Epoxyalkoxysilane is effective as long as it is a silane compound having one or more epoxy groups in one molecule and having two or three alkoxy groups, for example, γ-glycidoxypropyltrimethoxysilane, β-
(3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane and the like. Organic silane compounds other than the above-mentioned epoxyalkoxy silanes, for example, mercapto silane and vinyl silane, have some effects, but they are not sufficiently improved as connectors because they have an effect on the silane compounds specified in the present application. The amount of the epoxyalkoxysilane compound used as a material component of the connector of the present invention is 0.01 to 100 parts by weight of the polyarylene sulfide resin.
To 5 parts by weight, preferably 0.1 to 2 parts by weight.
When the amount is less than 0.01 part by weight, the intended effect cannot be obtained, and when the amount is excessively large, the mechanical properties deteriorate, which is not preferable. The connector of the present invention may further contain a suitable inorganic filler (C) as a material component according to the purpose. The inorganic filler (C) is not an essential component, but it is necessary to obtain a connector molded product with excellent properties such as mechanical properties, heat resistance, dimensional stability (deformation resistance, warpage), and electrical properties. Is preferably blended, and for this purpose, a fibrous, powdery or granular filler is used according to the purpose. Examples of the fibrous filler include glass fiber, asbestos fiber, carbon fiber, alumina fiber, zirconia fiber, boron nitride fiber, silicon nitride fiber, boron fiber, potassium titanate fiber, and stainless steel, aluminum, titanium, copper, and brass. Inorganic fibrous materials such as metal fibrous materials are exemplified. Particularly typical fibrous fillers are glass fibers or carbon fibers. In addition, a high melting point organic fibrous substance such as polyamide, fluorine resin, polyester resin, and acrylic resin can also be used. On the other hand, the powdery and granular fillers include carbon black, quartz powder, glass beads, glass powder, aluminum silicate, kaolin, talc, clay, diatomaceous earth, iron oxide, titanium oxide, zinc oxide, and oxides of metals such as alumina. Metal carbonates such as calcium carbonate and magnesium carbonate; metal sulfates such as calcium sulfate and barium sulfate; and silicon carbide, silicon nitride and boron nitride. Particularly preferred particulate fillers are calcium carbonate or talc. Moreover, mica,
Glass flakes and the like. These inorganic fillers can be used alone or in combination of two or more. The combined use of a fibrous filler, particularly a glass fiber and a granular and / or plate-like filler, is a preferable combination, particularly in terms of having both mechanical strength, dimensional accuracy, electrical properties and the like. When using these fillers, it is desirable to use a sizing agent or a surface treatment agent if necessary. This example is a functional compound such as an epoxy compound, an isocyanate compound, a silane compound and a titanate compound. These compounds are subjected to surface treatment or convergence treatment before use,
Alternatively, they may be added at the same time as material adjustment. The amount of the inorganic filler is from 0 to 400 parts by weight, preferably from 10 to 250 parts by weight, per 100 parts by weight of the polyarylene sulfide resin. If it is excessively large, the molding work of the connector becomes difficult, and the mechanical strength of the connector also has a problem. Further, the connector material of the present invention contains known substances generally added to thermoplastic resins and thermosetting resins, that is, stabilizers such as antioxidants and ultraviolet absorbers.
Antistatic agents, flame retardants, coloring agents such as dyes and pigments, lubricants, crystallization accelerators (nucleating agents), and the like can also be appropriately compounded according to the required performance. The connector of the present invention is composed of the above-described material components. The method of manufacturing the connector is generally to mix these components and melt-knead them in a single-screw or twin-screw extruder to form pellets once. It can be easily and economically obtained by forming a composition in the form of an injection and molding it by injection molding, but is not limited to this, and a method of mixing and molding a part of necessary components as a master batch is also possible. It is. Although the connector of the present invention is not limited to the outer shape, dimensions, and number of electrodes, the effects of the present invention are remarkable because those having a large number of electrodes have many welds and many burrs. EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the invention is limited thereto. Examples 1-2, Comparative Examples 1-4 Polyphenylene sulfide resin (manufactured by Kureha Chemical Industry Co., Ltd.
To the product name “Fortron KPS”), add the silane compound shown in Table 1 in the amount shown in the table, and add 5 parts with a Henschel mixer.
Premixed for minutes. Furthermore, commercially available glass fiber (diameter 13μm,
(3 mm in length) was added in the amount shown in Table 1 and mixed for 2 minutes. The mixture was extruded in an extruder having a cylinder temperature of 310 ° C. to form pellets of the polyphenylene sulfide resin composition. Next, the cylinder temperature was 320 ° C and the mold temperature was 150 using an injection molding machine.
At ℃, a connector (width 10 mm, thickness 5 mm, length 85 mm, 72 pin holes) was formed. This connector was subjected to a three-point bending strength tester to measure the bending fracture strength. The length of the burr generated on the protruding pin portion (gap: 20 μ) of the mold was measured. Next, the cylinder temperature of the above pellets was measured using an injection molding machine.
Molded 18-pin connector with terminal hole size 0.70mm at 320 ° C, mold temperature 150 ° C, 0.30mm at front end, 6mm at rear end, length
A 30 mm taper pin having a thickness of 0.58 mm was pressed into the terminal hole at a speed of 200 m / min, and the strength at break was measured. Table 1 shows the results. In addition, pellets were prepared in the same manner as described in Example 1 except that the silane compound was not mixed, or a silane compound other than those specified in the present invention, and a connector was formed using the same mold as in Example 1. did. Connect this connector to 3
The bending fracture strength was measured using a point bending strength tester. The burr length of the protruding pin was measured. Subsequently, the pin press-fit measurement connector shown in Example 1 was molded, and the pin press-fit breaking strength was measured. Table 1 shows the results. Example 3 A pellet was prepared in the same manner as in Example 1 except that γ-glycidoxypropyltrimethoxysilane was used in an amount shown in Table 2, and a connector was molded to obtain a flexural strength. And burr length were measured. Also, the pin press-in breaking strength was measured. Table 2 shows the results. Examples 4-6, Comparative Examples 5-10 Pellets were prepared in the same manner as in Example 1 except that the materials shown in Table 3 were blended in the amounts shown in Table 3 as silane compounds and inorganic fillers. And a connector was molded, and the bending fracture strength and the burr length were measured. Also, the pin press-in breaking strength was measured. Table 3 shows the results. Examples 7-8, Comparative Examples 11-14 Pellets were prepared in the same manner as in Example 1 except that the silane compounds and glass fibers shown in Table 4 were used in the amounts shown in the table. The connector was molded, and the bending fracture strength and the burr length were measured. Also, the pin press-in breaking strength was measured.
Table 4 shows the results. [Table 1] [Table 2] [Table 3] [Table 4] As is clear from the above description and examples, the connector of the present invention has the following effects. (1) The strength as a connector is improved, especially the pin press-in limit strength, which is important as a connector, is improved, and the defect that occurs when press-fitting a pin, which is a drawback of polyarylene sulfide resin connectors, is improved. Decrease. (2) It is economically advantageous because there are few burrs and the deburring step can be omitted. (3) Uses a material based on polyarylene sulfide resin, so it can withstand heat and solder melting temperature and can be used for surface mount technology applications.

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical indication location H01B 3/30 H01B 3/30 J // B29K 81:00 (56) References JP-A-59-59 181408 (JP, A) JP 6-39113 (JP, B2)

Claims (1)

(57) [Claims] A connector obtained by injection molding a composition comprising (A) 100 parts by weight of a polyarylene sulfide resin and (B) 0.01 to 5 parts by weight of an epoxyalkoxysilane (C) 0 to 400 parts by weight of an inorganic filler. 2. The component (A) has a melt viscosity of 100 to 5000 poise (310
2. The connector according to claim 1, wherein the connector is a polyphenylene sulfide resin having a shear rate of 1200 / sec. 3. The connector according to any one of claims 1 to 2, wherein the component (C) is 10 to 250 parts by weight of glass fiber. 4. (C) The component is glass fiber, calcium carbonate and / or
The connector according to any one of claims 1 to 3, wherein the connector is made of a mixture of talc and a total of 10 to 400 parts by weight.