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(Industrial Application Field) The present invention uses glass fibers as a molding material for mechanical parts that require heat resistance, oil resistance, impact resistance, rigidity, dimensional stability, etc., such as power tool housings, camera parts, connectors, etc. The present invention relates to a reinforced polycarbonate resin composition. (Prior Art and Problems) Glass fiber-reinforced polycarbonate resin has not only dimensional stability but also excellent mechanical strength and heat resistance, and is widely used in power tool housings, camera parts, etc. However, glass fiber-reinforced polycarbonate resin has poor fluidity, so when injection molding, the molding temperature must be extremely high, resulting in discoloration of the molded product due to the decomposition of the surface treatment agent for the glass fibers, and the heat of the polycarbonate resin itself. Molecular weight decrease and gas generation occur due to decomposition. Moreover, due to poor fluidity, the shape of the molded product is limited to thick-walled molded products or small-sized molded products. Furthermore, although oil resistance has been greatly improved by glass fiber reinforcement, cracks may occur due to insufficient oil resistance when used in parts with built-in motors under heat and stress. In order to solve the problem of moldability of glass fiber reinforced polycarbonate resin, polystyrene was further added to the system consisting of polycarbonate resin and glass fiber (Japanese Patent Publication No. 44-28188), polyolefin, polyolefin elastomer and styrene type elastomer were added. Adding one or more of the copolymers and unsaturated acid-modified polyolefin (Japanese Patent Application Laid-open No. 1983-
17153) and other methods have been considered to increase liquidity. However, these methods significantly reduce the mechanical strength, especially the falling ball impact strength. Glass fiber reinforced polycarbonate resin
Considering that it has been used to replace parts that traditionally used aluminum die-casting or metal, such as power tool housings and camera parts, the reduction in impact strength is a fatal drawback. Furthermore, since it is difficult to make the resin to be added and the polycarbonate resin completely compatible, disadvantages such as peeling of the gate part in injection molded products, occurrence of welds, and deterioration of the appearance occur. (Means for Solving the Problems) As a result of intensive studies to improve the moldability and oil resistance of glass fiber reinforced polycarbonate resin while maintaining its mechanical strength, the present inventors found that polycarbonate resin, glass fiber, and rubber The present inventors have discovered that a mixture consisting of a modified styrene-maleic anhydride copolymer and a bisphenol type epoxy resin is a resin that meets the purpose, and has completed the present invention. That is, the present invention provides (A) aromatic polycarbonate resin 45 to 94.9% by weight
(B) 5 to 54.9% by weight of a rubber-modified styrene-maleic anhydride copolymer, and (C) 0.1 to 15% by weight of a bisphenol-type epoxy resin. D) A glass fiber-reinforced polycarbonate resin composition characterized in that it contains 0.1 to 50 parts by weight of glass fiber. Here, aromatic polycarbonate resin (A)
is a bis(hydroxyaryl)alkane-based polycarbonate resin, such as bis(4-
hydroxyphenyl)methane, bis(4-hydroxyphenyl)ethane, 2,2-bis(4-hydroxyphenyl)propane, 2,2-bis(4-
Hydroxy-3,5-dichromophenyl)propane, 2,2-bis(4-hydroxy-3,5-dimethylphenyl)propane, 2,2-bis(4-
Bis(hydroxyaryl) alkanes such as hydroxy-3,5-dichlorophenyl)propane, bis(4-hydroxyphenyl)phenylmethane, etc. and carbonic acid esters such as phosgene (phosgene method) or diaryl carbonate (transesterification method). These can be used alone or in combination. This aromatic polycarbonate resin (A) is used at a ratio of usually 45 to 94.9% by weight, preferably 55 to 88% by weight in 100% by weight of the resin component consisting of (A), (B) and (C). do. In addition, as the rubber-modified styrene-maleic anhydride copolymer (hereinafter simply referred to as rubber-modified copolymer) (B), for example, in the presence of a chain transfer agent, a stabilizer, and/or a radical generator, etc. To,
Examples include those obtained by thermally polymerizing styrene monomer and maleic anhydride using a rubber component. An example of the manufacturing method is that the molar ratio of styrene/maleic anhydride is 1.4 to 49, preferably 4.6 to 17.
A monomer mixture, a rubber component, a known and commonly used radical generator, and a chain transfer agent are added to a ketone solvent such as acetone or methyl isobutyl ketone, and the mixture is heated at a temperature of 60 to 180°C, preferably 75 to 140°C. The rubber-modified copolymer (B) obtained in this way is precipitated using a poor solvent such as petroleum benzine or methanol, and is then precipitated as it is, and if necessary, an antioxidant is added thereto. It is also possible to use a product obtained by adding the like, and then granulating it using an extruder or the like. The rubber component is usually 2 in the rubber modified copolymer (B).
It is contained in ~25% by weight, preferably 5 to 12% by weight. Typical examples of rubber components include:
Polybutadiene rubber, butadiene-styrene rubber or butadiene-acrylic rubber containing 60-95% by weight of butadiene, isoprene rubber, isoprene-styrene rubber or isoprene-acrylic rubber containing 60-95% by weight of isoprene, These include butadiene-styrene A-B type block rubber or A-B-A type block rubber containing butadiene, ethylene-propylene copolymer rubber (EPT) or ethylene-propylene-cyclopentadiene copolymer rubber (EPDM), etc. are used singly or as a mixture of two or more. Among them, polybutadiene rubber is preferred. As the rubber-modified copolymer (B) specified above, commercially available products such as "Dylarc #250, #350, #700" (all products of Arco Polymers, Inc., USA) are applicable. This rubber modified copolymer (B) is usually contained in a proportion of 5 to 54.9% by weight, preferably 10 to 35% by weight in 100% by weight of the resin component consisting of (A), (B) and (C). use. The proportion of rubber modified copolymer (B) is 54.9% by weight
If it exceeds this range, not only the heat resistance of the resulting polycarbonate resin composition will decrease, but also the mechanical strength will decrease, which is not practical. Further, if it is less than 5% by weight, moldability and oil resistance are not sufficiently improved. Next, the above-mentioned bisphenol type epoxy resin (C)
is the general formula (However, in the formula, R 1 , R 2 , R 3 are a hydrogen atom or a lower alkyl group having 1 to 3 carbon atoms, Q is a hydrogen atom, a chlorine atom, or a bromine atom, and n is a number from 0 to 100,000. ) is a bisphenol type epoxy resin. An example of the method for preparing the above-mentioned bisphenol type epoxy resin is that 2,
Using 1.5 to 8 moles of epichlorohydrin, preferably 1.8 to 4.4 moles of epichlorohydrin per mole of 2-bis(4-hydroxyphenyl)propane (bisphenol A) or bis(4-hydroxyphenyl)methane (bisphenol F). The reaction is carried out at a temperature of 50 to 140°C, and then the aqueous layer is separated, or if necessary, water and
There is a method of purification by neutralizing and washing with a weak acid such as NaHPO 4 and then removing epichlorohydrin by distillation under reduced pressure. Commercially available bisphenol type epoxy resin
Specific examples of (C) include "Epicron 850, 1050, 4050, 7050 and 9050" as bisphenol type A.
[The above products are manufactured by Dainippon Ink and Chemicals Co., Ltd.] and "phenoxy resins PKHC, PKHH, and PKHJ" (the above products are manufactured by Union Carbide Co., Ltd. in the United States) are used as bisphenol F type "Epicron 830 and
831'' [manufactured by Dainippon Ink and Chemicals Co., Ltd.], and halogenated bisphenol type epoxy resins such as ``Epicron 152 and 1120'' [all manufactured by Dainippon Ink and Chemicals Co., Ltd.]. Any of these can be used in the present invention. This bisphenol type epoxy resin (C) is (A),
Normally in 100% by weight of the resin component consisting of (B) and (C)
It is used in an amount of 0.1 to 15% by weight, preferably 2 to 10% by weight. If the proportion of the bisphenol type epoxy resin (C) is less than 0.1% by weight, the resulting composition will have poor compatibility and the falling ball impact strength will not improve. Moreover, if it exceeds 15% by weight, not only the practical strength will not be improved, but also the heat resistance will decrease, which is not preferable. Further, the glass fiber (D) used in the present invention is preferably chopped strand, but processed forms such as glass yarn, glass cloth, roving, roving cloth, chopped strand mat, milled fiber, etc. can also be used. . In addition, these glasses can be treated with coupling agents, wetting agents, etc.
Surface treatment may be applied. The amount of glass fiber used is
It is usually 0.1 to 50 parts by weight, preferably 5 to 50 parts by weight per 100 parts by weight of the resin component consisting of (A), (B) and (C).
45 parts by weight. Preferably, the polycarbonate resin composition of the present invention is prepared by heating and melting mixing using a single-screw or multi-screw extruder.
A method of mixing using a mixer, or even a method of mixing and molding a dry blend using a direct injection molding machine may be used. The mixing method is a method of simultaneously mixing aromatic polycarbonate resin, rubber modified copolymer, bisphenol type epoxy resin, and glass fiber;
Alternatively, there is a method in which two or more of these components are melt-mixed in advance and other components are mixed therewith. Furthermore, known and commonly used additives such as antioxidants, antistatic agents, ultraviolet absorbers, flame retardants, colorants, plasticizers, inorganic fillers, and lubricants may be added as necessary during mixing. (Effects of the Invention) The glass fiber reinforced polycarbonate resin composition of the present invention not only has excellent mechanical strengths such as tensile strength, bending strength, isot impact strength, and falling ball impact strength, but also has excellent moldability. Due to this good moldability, injection molded products made from the composition according to the present invention have inconspicuous weld lines, no decrease in strength at the weld area, less orientation of glass fibers, and no glass fibers rising to the surface. It has features such as excellent appearance. Furthermore, it is possible to easily mold products with complex shapes, thin-walled products, and products with many welded parts that could not be molded using conventional glass fiber polycarbonate resins. Furthermore, since it can be molded at low cylinder temperatures, the molded product does not show any staining or discoloration. Oil resistance is a very important property when used in power tool housings, and the composition of the present invention is also extremely excellent in oil resistance. As described above, by using the composition of the present invention, it is possible to provide glass fiber-reinforced molded products with excellent oil resistance, impact strength, and appearance, and which can be formed in a wide range of shapes regardless of complexity or thinness. becomes possible. (Example) The present invention will be specifically explained with reference to Examples and Comparative Examples. The detailed methods of various tests conducted in the examples are shown below. <Basic physical property test> The pelletized resin composition is injection molded using a 1 oz in-line injection molding machine to obtain various test pieces for measuring basic physical properties, and these test pieces are used to measure various basic physical properties. . The physical property measurement items and measurement methods are shown below. Tensile breaking strength - Measured in accordance with ASTM D-638. Tensile elongation at break - Bending strength - Measured in accordance with ASTM D-790. Flexural modulus - Measured in accordance with ASTM D-790. Izotsu impact strength (notched test piece thickness 1/
4 inches and 1/8 inches) - Measured according to ASTM D-256. Heat Distortion Temperature - Measured in accordance with ASTM D-648. <Falling ball impact test> Using a 10 oz injection molding machine, pelletized resin was made into pellets with a size of 175 x 119 x 40 mm and a thickness of 3.3 mm.
mm box-shaped molded product, and a steel ball weighing 1.0 kg and tip R = 32 mm is placed in the center of the molded product at a falling height of 5 mm.
Starting at 5 cm, the drop height is increased in 5 cm intervals, and the ball is repeatedly dropped at 5, 10, 15 cm, etc., and the height at which breakage or cracks occur in the molded product is indicated as the falling ball impact strength. <Moldability test> Using a 1-ounce in-line injection molding machine at an injection pressure of 600 kg/cm 2 and a mold temperature of 110°C, the mold cavity must be sufficiently filled with resin to obtain a suitable molded product. Find the cylinder temperature. It can be said that the lower the cylinder temperature, the better the moldability. <Oil resistance test> 600 kg/kg was applied to the center of a 1/4 x 1/2 x 5 inch bending strength test piece molded using a 1 oz in-line injection molding machine for a 1/4 inch thickness. Apply a bending load of cm2 , immerse in carbon tetrachloride at 23°C, and determine the time until the test piece breaks. The longer the time until breakage, the better the oil resistance. The reason we chose carbon tetrachloride is that it is the most likely to damage polycarbonate resin, so it can be considered an accelerated test for oil resistance. Example 1 Polycarbonate resin "Novarex 7025A" produced from 2,2-bis(4-hydroxyphenyl)propane [manufactured by Mitsubishi Chemical Industries, Ltd.] 82 parts by weight,
"Dylarc #250" (rubber-modified styrene-maleic anhydride copolymer manufactured by Arco Polymers) 14 parts by weight and "Epicron 9050" [bisphenol A type epoxy resin manufactured by Dainippon Ink & Chemicals Co., Ltd.] 4
Parts by weight were dry blended. 100 parts by weight of such dry blend and 17.6 glass fibers treated with an aminosilane coupling agent having a length of 6 mm and a diameter of 13 ÎŒm.
Parts by weight were mixed and pelletized using a single screw extruder to obtain polycarbonate resin composition pellets of the present invention. The various tests described above were conducted using this pellet. The results are shown in Table-1. The molding conditions for the test piece using a 1 oz injection molding machine were cylinder temperature.
The molding conditions for the box-shaped molded product for the falling ball impact test using a 10-ounce injection molding machine are 270â, mold temperature 110â, injection pressure 600Kg/cm 2 , injection time 15 seconds, and cooling time 10 seconds. Temperature 270â, mold temperature 110â, injection pressure 800Kg/cm 2 , holding pressure 700Kg/cm 2 , injection time 20
The cooling time was 30 seconds. Comparative Example 1 100 parts by weight of "Novarex 7025A" and Example 1
17.6 parts by weight of the glass fibers similar to those used in Example 1 were pelletized in the same manner as in Example 1 to obtain comparative polycarbonate resin composition pellets, which were then used to conduct the various tests described above. The results are shown in Table-1. The injection molding conditions for the test piece and the box-shaped molded product were the same as in Example 1 except that the cylinder temperature was 320°C. Comparative Example 2 Except for using 18 parts by weight of "Deitsku Styrene CR-4500" [polystyrene resin manufactured by Dainippon Ink & Chemicals Co., Ltd.] instead of 14 parts by weight of "Dylarc #250" and 4 parts by weight of "Epiclon 9050". Comparative polycarbonate resin composition pellets were obtained in the same manner as in Example 1, and then the various tests described above were conducted using the pellets. The results are shown in Table-1. The injection molding conditions for the test piece and the box-shaped molded product were the same as in Example 1 except that the cylinder temperature was 275°C. Example 2 62 parts by weight of "Iupilon S-2000" (polycarbonate resin manufactured by Mitsubishi Gas Chemical Co., Ltd.), 30 parts by weight of "Dylarc #250" and 8 parts by weight of "Epicron 9050" were dry blended. Such dry blend
100 parts by weight and 43 parts by weight of glass fibers similar to those used in Example 1 were pelletized using a single screw extruder to obtain the polycarbonate resin composition pellets of the present invention, which were then used to produce the various types of polycarbonate resin compositions described above. A test was conducted. The results are shown in Table-1. The injection molding conditions for the test piece and the box-shaped molded product were the same as in Example 1 except that the cylinder temperature was 290°C. Comparative Example 3 100 parts by weight of âIupilon S-2000â and Example 1
43 parts by weight of glass fibers similar to those used in Example 1 were pelletized in the same manner as in Example 1 to obtain comparative polycarbonate resin composition pellets, which were then used to conduct the various tests described above. The results are shown in Table-1. The injection molding conditions for the test piece and the box-shaped molded product were the same as in Example 1 except that the cylinder temperature was 330°C.
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