JP2020055932A - Thermoplastic resin composition, method for producing the same, and exterior material component - Google Patents

Abstract

To provide: a thermoplastic resin composition having high flame retardancy, high rigidity, and high fluidity; and a method for producing the same, and the like.SOLUTION: The thermoplastic resin composition is produced by first melt kneading a polycarbonate resin and a flame retardant, and adding halfway therethrough inorganic fiber and a lubricant, followed by melt kneading. The thermoplastic resin composition has flame retardancy of HB to 5 VA, toughness of 5 kJ/m2 to 100 kJ/m2, fluidity of 150 mm to 300 mm, and rigidity of 3300 MPa to 7000 MPa. Further, the composition is such that, relative to 100 pts.mass of a polycarbonate resin, there are contained 0.1 to 5 pts.mass of a sulfonic acid metal salt as the flame retardant, 1 to 50 pts.mass of glass fiber as the inorganic fiber, 0.1 to 10 pts.mass of a silicone compound, 0.1 to 10 pts.mass of the lubricant, and 0.1 to 5 pts.mass of a drip inhibitor.SELECTED DRAWING: None

Description

  The present invention relates to a thermoplastic resin composition having high flame retardancy, high rigidity, and high fluidity, a method for producing the same, and an exterior component using the same.

  Polycarbonate resin compositions are widely used because resins used for exterior parts such as electric / electronic / OA equipment require high strength and high flame retardancy. Further, the thickness of the molded article is reduced for the purpose of reducing the weight of the molded article and reducing the environmental load by reducing the amount of material used. When the thickness of the molded product is reduced, there is a problem that the rigidity is reduced. In order to increase rigidity, it is effective to add glass fiber.

  On the other hand, in recent years, there has been a strong demand for the polycarbonate resin composition to be used to be flame-retardant, mainly for the use of exterior parts such as electric, electronic, and OA equipment. In order to meet the demand for flame retardancy, a method of adding an aromatic oligomeric phosphate ester is generally used. However, in order to obtain excellent flame retardancy, it is necessary to add a large amount of an aromatic oligomer-based phosphoric acid ester, which has a disadvantage that mechanical properties and thermal properties are impaired. Glass fiber reinforced polycarbonate resin compositions which have been flame retarded by non-halogen flame retardants include, in addition to those to which aromatic oligomeric phosphate esters have been added, for example, glass fibers and sulfonic acid metal salts in polycarbonate resins. (See Patent Document 1 below).

JP 2002-226697 A

  As a material for an exterior component such as an electric / electronic / OA apparatus, a thermoplastic resin composition having high rigidity, high flame retardancy and high fluidity is desired. However, although the above-mentioned Patent Literature 1 discloses that the flame retardancy is high, it does not specifically show the improvement of the fluidity.

  The present invention has been made in view of the above requirements, and has a high flame retardancy, a high rigidity, and a high fluidity. It aims to provide parts.

  The gist of the present invention to achieve this object lies in the inventions in the following items.

[1] A thermoplastic resin composition containing a polycarbonate resin, a flame retardant, an inorganic fiber, and a lubricant, and has a flame retardancy of HB or more and a fluidity of 150 mm or more.

[2] A thermoplastic resin composition containing a polycarbonate resin, a flame retardant, an inorganic fiber, a lubricant, and a silicone compound, having a flame retardancy of HB or more, a toughness of 5 kJ / m2 or more, and a fluidity of 150 mm or more, A thermoplastic resin composition having a rigidity of 3300 MPa or more.

[3] With respect to 100 parts by mass of the polycarbonate resin, 0.1 to 5 parts by mass of a metal sulfonic acid salt as a flame retardant, 1 to 50 parts by mass of glass fiber as an inorganic fiber, and 0.1 to 10 parts by mass of a silicone compound. The thermoplastic resin composition according to [2], comprising 0.1 to 10 parts by mass of a lubricant and 0.1 to 5 parts by mass of a drip inhibitor.

[4] The sulfonic acid metal salt is a polystyrene sulfonic acid metal salt,
The drip inhibitor is a fluororesin,
The silicone compound is a polyorganosiloxane having an aromatic group,
The thermoplastic resin composition according to [3], wherein the lubricant is one or more selected from the group consisting of a fatty acid, a fatty acid ester, and a fatty acid aramid.

[5] The thermoplastic resin composition has a flame retardancy of HB or more and 5 VA or less, a toughness of 5 kJ / m2 or more and 100 kJ / m2 or less, a fluidity of 150 mm or more and 300 mm or less, and a rigidity of 3300 MPa or more and 7000 MPa or less [ The thermoplastic resin composition according to any one of [1] to [4].

[6] The thermoplastic resin composition according to any one of [1] to [5], wherein the glass fiber has a fiber length of 150 μm or more and 1000 μm or less.

[7] An exterior component for a copying machine, comprising the thermoplastic resin composition according to any one of [1] to [6].

[8] A method for producing a thermoplastic resin composition, comprising: first, melt-kneading a polycarbonate resin and a flame retardant; and adding and kneading inorganic fibers and a lubricant in the middle.

[9] The method for producing a thermoplastic resin composition according to [8], wherein the inorganic fiber and the lubricant are added in an amount of 50% to 80% of the screw length of the kneader.

  According to the present invention, there are provided a thermoplastic resin composition having high flame retardancy, high rigidity, and high fluidity, a method for producing the same, and an exterior component using the thermoplastic resin composition.

  The thermoplastic resin composition according to the present invention is a thermoplastic resin composition having high flame retardancy, high rigidity, and high fluidity. For example, it can be produced by a production method in which a polycarbonate resin and a flame retardant are first melt-kneaded, and inorganic fibers and a lubricant are added in the middle and melt-kneaded.

  The reason that a thermoplastic resin composition having high flame retardancy, high rigidity, and high fluidity can be obtained by the above-described production method is as follows.

  A polycarbonate resin alone cannot exhibit high flame retardancy, high rigidity, and high fluidity. The flame retardant contributes to high flame retardancy, the inorganic fiber contributes to high rigidity, and the lubricant contributes to high fluidity. However, even if these polycarbonate resins, flame retardants, inorganic fibers, and lubricants are simultaneously added and melt-kneaded, high flame retardancy, high rigidity, and high fluidity cannot be simultaneously achieved.

  This is because it is necessary to uniformly disperse the flame retardant in the resin composition in order to exhibit high flame retardancy, and a strong shearing force is required during melt-kneading. On the other hand, in order to exhibit high rigidity and high fluidity, it is better to use long fibers as the inorganic fibers, and therefore, it is better to use a weak shear force during melt-kneading. Further, if the lubricant has a strong shearing force, the lubricant itself deteriorates or decomposes and cannot perform its function. Therefore, the shearing force is preferably weak.

  The shear force is related to the length of the screw of the kneader at the time of melt kneading. A screw length of 0% indicates the head of the kneader (kneading start position), and a screw length of 100% indicates the end of the kneader (outlet of the kneaded product). The longer the screw is fed from a position close to the screw length of 0% and the longer it is melt-kneaded, the longer the shearing time becomes, so that the shearing force applied to the material to be kneaded increases. On the other hand, for example, when melt-kneading from a middle point such as a screw length of 50%, the shearing time from that point to the screw length of 100% is shortened, so that the shearing force applied to the material to be kneaded is correspondingly reduced. .

  Therefore, the flame retardant can be uniformly dispersed in the resin composition by melt-kneading the polycarbonate resin and the flame retardant first (from the position where the screw length is 0%). Further, by adding and kneading the inorganic fiber and the lubricant in the middle and melt-kneading the inorganic fiber, the inorganic fiber can be maintained as a long fiber, and deterioration and decomposition of the lubricant can be suppressed. As a result, a polycarbonate resin composition having high flame retardancy, high rigidity, and high fluidity can be obtained.

  Further, it is preferable that the glass fiber, the silicone compound, and the lubricant are added in the middle and melt-kneaded. By doing so, the glass fibers can be kept as long fibers. The deterioration and decomposition of the lubricant can be suppressed. Also, by adding glass fiber and silicone compound at the same time, the flame retardant tends to gather around the glass fiber, suppressing the effect of reducing the flame retardancy of the glass fiber by the candle effect. A polycarbonate resin composition having excellent high fluidity can be obtained.

  Further, the thermoplastic resin composition according to the present invention is a thermoplastic resin composition containing a polycarbonate resin, a flame retardant, an inorganic fiber, and a lubricant. It is a thing. Preferably, it is a thermoplastic resin composition further containing a silicone compound, having flame retardancy of HB or more, toughness of 5 kJ / m2 or more, fluidity of 150 mm or more, and rigidity of 3300 MPa or more. If the upper limit is further indicated, thermoplasticity showing physical properties of flame retardancy of HB or more and 5 VA or less, toughness of 5 kJ / m2 or more and 100 kJ / m2 and fluidity of 150 mm or more and 300 mm or less, and rigidity of 3300 MPa or more and 7000 MPa or less It is a resin composition.

  The formulation of the thermoplastic resin composition according to the present invention is based on 100 parts by mass of a polycarbonate resin, 0.1 to 5 parts by mass of a metal sulfonate as a flame retardant, and 1 to 50 parts by mass of glass fibers as inorganic fibers. It contains 0.1 to 10 parts by mass of a silicone compound, 0.1 to 10 parts by mass of a lubricant, and 0.1 to 5 parts by mass of a drip inhibitor. In particular, the metal sulfonic acid salt is a metal polystyrene sulfonic acid salt, the drip inhibitor is a fluororesin, the silicone compound is a polyorganosiloxane having an aromatic group, and the lubricant is a group consisting of a fatty acid, a fatty acid ester, and a fatty acid aramid. It is preferable that one or two or more selected from the above.

  The fiber length of the glass fiber is desirably in the range of 150 μm or more and 1000 μm or less. Further, it is preferable to add the inorganic fiber and the lubricant in the range of 50% to 80% of the screw length of the kneader. The kneader may be of any type, such as a single screw type, a twin screw type, or a multi screw type.

  The present invention also includes exterior parts such as electric / electronic / OA equipment manufactured by injection molding or the like using the thermoplastic resin composition according to the present invention, for example, exterior parts for copiers and multifunction peripherals. In addition, the molded article manufactured using the thermoplastic resin composition according to the present invention is not limited to this. For example, home electric appliances and automobile parts may be used.

  Next, methods for evaluating various properties of the thermoplastic resin composition according to the present invention will be described.

(1) Evaluation of Flame Retardancy After the resin composition to be evaluated was dried at 80 ° C. for 4 hours, it was molded into a strip-shaped test piece having a length of 100 mm × a width of 10 mm × a depth of 1.6 mm. The test was performed.

  In the flame retardancy test, the test piece was conditioned in a constant temperature room at a temperature of 23 ° C. and a humidity of 50% for 48 hours, and a well-known UL94 test (equipment of equipment) defined by the United States Underwriters Laboratories (UL) was conducted. (Combustion test of plastic materials for parts). As is well known, UL94V is classified into HB, V2, V1, V0, 5VB, and 5VA, and the flame retardancy increases in this order (HB has the lowest flame retardancy, and 5VA has the least difficulty). Highly flammable).

The flame retardancy of the test pieces of each of Examples and Comparative Examples described later was evaluated by the above method, and the evaluation results were classified as follows.
◎: 5VA, 5VB, V0
：: V1 and V2
△: HB
×: notV (non-standard / practical problem)

(2) Evaluation of Toughness After the resin composition to be evaluated was dried at 80 ° C. for 4 hours, it was molded into a rectangular test piece of 80 mm × 10 mm × 4 mm, and subjected to Izod impact in accordance with “JIS-K7110”. A test was performed and evaluated according to the following evaluation criteria.
◎: 11kJ / ^{m 2} or more ○: 8kJ / ^{m 2} more than 11kJ / ^m less than ² △: ^5kJ / ^{m 2} or more 8kJ / ^m less than ² (practically no problem)
×: less than 5 kJ / m ² (problematic in practice)

(3) Evaluation of fluidity The fluidity was evaluated by drying the resin composition to be evaluated at 80 ° C. for 4 hours, and then performing injection molding on a spiral mold having a width of 10 mm and a thickness of 2 mm. Was measured. The mold temperature was 50 ° C., the molding temperature was 250 ° C., the injection speed was 30 mm / sec, and the injection pressure was 90 MPa. In consideration of the fact that the molded product can be appropriately molded even when the thickness of the molded product is reduced, evaluation was made based on the following criteria.
：: 200 mm or more △: 150 mm or more and less than 200 mm ×: less than 150 mm

(4) Evaluation of Rigidity After the resin composition to be evaluated was dried at 80 ° C. for 4 hours, it was molded into a rectangular test piece of 80 mm × 10 mm × 4 mm, and in accordance with the conditions of “JIS 7127”. A bending test was performed and evaluated according to the following evaluation criteria.
：: 3600 MPa or more Δ: 3300 MPa or more and less than 3600 MPa ×: less than 3300 MPa

  Next, the composition contained in the thermoplastic resin composition according to the present invention will be described.

<Polycarbonate>
The polycarbonate resin is an aromatic homo- or copolycarbonate resin that can be produced by reacting an aromatic dihydric phenol compound with phosgene or a carbonic acid diester. The method for producing the polycarbonate resin is not particularly limited, and a known production method can be employed. Examples of the method for producing a polycarbonate resin include a method in which phosgene or the like is directly reacted with an aromatic dihydric phenol compound (interfacial polymerization method), or a method in which an aromatic dihydric phenol compound and a carbonic acid diester such as diphenyl carbonate are melted. (Solution method).

The viscosity average molecular weight of the polycarbonate resin is preferably from 1 × 10 ⁴ to 1 × 10 ⁶ . The viscosity average molecular weight of the polycarbonate resin can be measured with "CBM-20Alite system" and "GPC software" (both manufactured by Shimadzu Corporation).

  Examples of the aromatic dihydric phenol compound include 2,2-bis (4-hydroxyphenyl) propane, 2,2-bis (4-hydroxy-3,5-dimethylphenyl) propane, and bis (4-hydroxyphenyl) ) Methane, 1,1-bis (4-hydroxyphenyl) ethane, 2,2-bis (4-hydroxyphenyl) butane, 2,2-bis (4-hydroxy-3,5-diphenyl) butane, 2,2 -Bis (4-hydroxy-3,5-diethylphenyl) propane, 2,2-bis (4-hydroxy-3,5-diethylphenyl) propane, 1,1-bis (4-hydroxyphenyl) cyclohexane, and 1 -Phenyl-1,1-bis (4-hydroxyphenyl) ethane. As the aromatic dihydric phenol compound, one kind may be used alone, or two or more kinds may be used in combination.

  Examples of carbonic acid diesters include diaryl carbonates such as diphenyl carbonate, ditolyl carbonate, bis (chlorophenyl) carbonate, dialkyl carbonates such as dimethyl carbonate, diethyl carbonate, carbonyl halides such as phosgene, and haloformates such as dihaloformates of dihydric phenols. It is. The diester carbonate is preferably diphenyl carbonate. One type of carbonic acid diester may be used alone, or two or more types may be used in combination.

  Examples of the polycarbonate resin include polyfunctional tri- or higher such as 1,1,1-tris (4-hydroxyphenyl) ethane or 1,1,1-tris (3,5-dimethyl-4-hydroxyphenyl) ethane. It includes a branched polycarbonate resin obtained by copolymerizing a functional aromatic compound and a polyester carbonate resin obtained by copolymerizing an aromatic or aliphatic bifunctional carboxylic acid. One type of polycarbonate resin may be used alone, or a mixture of two or more types may be used. Further, the polycarbonate resin may be a polycarbonate resin (recycled polycarbonate resin) obtained from a molded product discarded after being used.

<Inorganic fiber>
The inorganic fiber may be prepared, or a commercially available product may be purchased. The diameter of the inorganic fiber is preferably 2 to 40 μm, and the fiber length is usually in the range of 0.1 to 10 mm. It is preferable to use a silane coupling agent, a titanate coupling agent, an aluminate coupling agent or the like which has been subjected to a surface treatment or a surface oxidation treatment. Further, it is preferable to use a resin that has been subjected to a bundle treatment with an olefin resin, a styrene resin, an acrylic resin, a polyester resin, an epoxy resin, a urethane resin, or the like. The inorganic fibers are preferably glass fibers. The addition amount is preferably 1 to 50 parts by mass with respect to 100 parts by mass of the polycarbonate resin. If it is less than 1 part by mass, the flame retardancy and rigidity are adversely affected, and if it is more than 50 parts by mass, the fluidity is adversely affected.

<Flame retardant>
The flame retardant may be an organic flame retardant or an inorganic flame retardant. Examples of the organic flame retardant include a bromo compound and a phosphorus compound. Examples of inorganic flame retardants include antimony compounds and metal hydroxides. Metal sulfonic acid salts are particularly preferred. The flame retardants may be used alone or in combination of two or more. The addition amount is preferably 0.1 to 5 parts by mass with respect to 100 parts by mass of the polycarbonate resin. If it is less than 0.1 part by mass, the flame retardancy and fluidity are adversely affected, and if it is more than 5 parts by mass, the toughness is adversely affected.

<Drip inhibitor>
The drip suppressing agent is added for the purpose of suppressing dripping (drip) of the resin material during combustion and improving flame retardancy. Examples of the drip inhibitor include phenol resins, fluorine-based drip inhibitors, silicone rubbers, and layered silicates. The drip inhibitors may be used alone or in combination of two or more. Fluorine drip inhibitors are particularly preferred. The addition amount is preferably 0.1 to 5 parts by mass with respect to 100 parts by mass of the polycarbonate resin. If it is less than 0.1 part by mass, the flame retardancy is adversely affected, and if it is more than 5 parts by mass, the toughness and fluidity are adversely affected.

<Silicone compound>
The silicone compound is based on an organopolysiloxane having an organic group attached to a siloxane bond. Examples of the silicone compound include poly (phenylmethylmethoxyhydrogen) siloxane, poly (phenylmethyl) siloxane, and poly (phenylhydrogen). Examples include siloxane, poly (methylethyl) siloxane, poly (dimethyl) siloxane, poly (diphenyl) siloxane, poly (diethyl) siloxane, and poly (ethylphenyl) siloxane.

  Further, specific examples of polyorganosiloxane include dimethylsiloxane, methylethylsiloxane, phenylmethylsiloxane, diphenylsiloxane, diethylsiloxane, ethylphenylsiloxane, methylhydrogensiloxane, phenylhydrogensiloxane, phenylmethoxysiloxane, methylmethoxysiloxane, and the like. Examples thereof include those obtained by copolymerizing a plurality of siloxane units and mixtures thereof.

  Examples of the functional group (substituent) bonded to silicon of the siloxane unit constituting the polyorganosiloxane include a hydrogen group, an aromatic group, an alkyl group, an alkoxy group, a hydroxyl group, an amino group, a carboxyl group, a silanol group, and a mercapto group. , An epoxy group, a vinyl group, an aryloxy group, a polyoxyalkylene group, a vinyl group and the like. The form of the polyorganosiloxane may be, for example, any of oil, varnish, gum, powder, and pellet.

  Polyorganosiloxanes having aromatic groups are particularly preferred. The addition amount is preferably 0.1 to 10 parts by mass with respect to 100 parts by mass of the polycarbonate resin. If it is less than 0.1 part by mass, the flame retardancy and toughness are adversely affected, and if it is more than 10 parts by mass, the fluidity is adversely affected.

<Lubricant>
Examples of the lubricant include fatty acids, fatty acid salts, fatty acid esters, fatty acid aramids, silane polymers, solid paraffin, liquid paraffin, calcium stearate, zinc stearate, stearic amide, silicone powder, methylenebisstearic amide, and N, N′-ethylene One or more kinds selected from the group consisting of bisstearic acid amides may be mentioned. Fatty acids, fatty acid esters and fatty acid aramids are particularly preferred. The addition amount is preferably 0.1 to 10 parts by mass with respect to 100 parts by mass of the polycarbonate resin. If it is less than 0.1 part by mass, the fluidity is adversely affected, and if it is more than 10 parts by mass, the flame retardancy and toughness are adversely affected.

  Next, the present invention will be described more specifically with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples.

  Table 1 below lists the names, product names, and manufacturer names of each composition (compound).

  Table 2 shows the evaluation results of Examples and Comparative Examples and the formulations of the respective thermoplastic resin compositions. In Table 2, the proportion of each composition is shown in units of parts by mass.

  Examples and comparative examples will be described.

(Example 1)
Using a twin-screw kneader "KTX-30" (manufactured by Kobe Steel), 100 parts by mass of a polycarbonate resin "Taflon A-1900" (manufactured by Idemitsu Kosan Co., Ltd.) and a flame retardant "KFBS" (Mitsubishi Materials Electronics Chemical Co., Ltd.) And 1 part by mass of a glass fiber "CS 3PE-937S" (manufactured by Nitto Boseki Co., Ltd.) from a position where the screw length of 70% of KTX-30 is kneaded at a cylinder temperature of 260 ° C. and a screw rotation speed of 300 rpm. ) 40 parts by mass and 1 part by mass of a lubricant "LICOWAX PE520" (manufactured by Clariant) were added in the middle to obtain a thermoplastic resin composition of Example 1. All of the physical properties such as flame retardancy, toughness, fluidity, and rigidity are values having no practical problems.

(Example 2)
The thermoplastic resin composition of Example 2 was composed of 2 parts by mass of a drip inhibitor "PR-HF-6" (manufactured by Sumitomo Bakelite) and 1.5 parts by mass of a silicone compound "KR-220L" (manufactured by Shin-Etsu Chemical Co., Ltd.) All parts were prepared in the same manner as in Example 1 except that KTX-30 was newly added from the position of the screw length of 70%. In Example 2, flame retardancy was improved by adding a drip inhibitor and a silicone compound to Example 1 (HB → V2).

(Example 3)
In the thermoplastic resin composition of Example 3, the flame retardant in Example 2 was 1 part by mass of "sodium polystyrene sulfonate" (manufactured by Fuji Film Wako Pure Chemical Industries, Ltd.), and the drip inhibitor was "METABLEN A-3750" (Mitsubishi). 0.5 parts by mass of Chemical Co., Ltd., 1.5 parts by mass of silicone compound "KR-480" (Shin-Etsu Chemical Co., Ltd.), and 1 part by mass of lubricant "Fatty Acid Amide S" (Kao Corporation) All were produced in the same manner as in Example 2 except for the above. In Example 3, the flame retardancy (V2 → V1) and toughness (5 → 9) were improved as compared with Example 2 by changing the composition of Example 2 as described above.

(Example 4)
The thermoplastic resin composition of Example 4 was prepared in the same manner as in Example 3 except that the glass fiber “CS 3PE-937S” (manufactured by Nitto Boseki) of 40 parts by mass was changed to 15 parts by mass. . By the above change, the flame retardancy (V1 → V0), toughness (9 → 12), fluidity (170 → 220) and rigidity (3700 → 3300) were reduced compared to Example 3. Are also good values, and are the best overall in each of the examples.

(Example 5)
The thermoplastic resin composition of Example 5 was prepared in the same manner as in Example 4 except that the screw length of 70% at the time of intermediate addition was changed to 30%. Flame retardancy (V0 → V1), toughness (12 → 6), fluidity (220 → 180), and rigidity (3700 → 3300) all decreased due to the above change in screw length. Not in range. Compared with Example 4, it is considered that the screw length is preferably 50% or more.

(Example 6)
The thermoplastic resin composition of Example 6 was prepared by adding 15 parts by mass of the glass fiber “CS 3PE-937S” (manufactured by Nitto Boseki Co., Ltd.) to 5 parts by mass and the flame retardant “sodium polystyrene sulfonate” (Fuji Film 0.5 parts by mass of 1 part by mass (Wako Pure Chemical Industries, Ltd.), 0.5 parts by mass of drip inhibitor "METABLEN A-3750" (manufactured by Mitsubishi Chemical Corporation) in 0.1 parts by mass, and silicone compound "KR" -480 "(Shin-Etsu Chemical Co., Ltd.) 1.5 parts by mass to 5.5 parts by mass, and lubricant" Fatty Acid Amide S "(Kao Corporation) 1 part by mass was changed to 0.1 part by mass. It was produced in the same manner as in Example 4. In Example 6, the toughness (12 → 120) was greatly improved as compared with Example 4, but other physical properties (flammability (V0 → HB), fluidity (220 → 150), rigidity (3700 → 3300) )) Dropped. It is considered that the toughness (120) in Example 6 exceeded the upper limit of an appropriate range, because other physical properties other than toughness were reduced.

(Example 7)
The thermoplastic resin composition of Example 7 was prepared in the same manner as in Example 4 except that 1 part by mass of the lubricant “fatty acid amide S” (manufactured by Kao Corporation) in Example 4 was changed to 3 parts by mass. In Example 7, the fluidity (220 → 310) was improved as compared with Example 4, but other physical properties (flame retardancy (V0 → HB), toughness (12 → 5), rigidity (3700 → 3300)) ) Dropped. It is considered that the fluidity (310) in Example 7 exceeds the upper limit of the appropriate range, because other physical properties other than the fluidity were reduced.

(Example 8)
The thermoplastic resin composition of Example 8 was prepared in the same manner as in Example 4 except that the screw length at the time of the intermediate addition was changed from 70% to 90%. In Example 8, the glass fiber length (500 → 1200) was longer and the rigidity (3700 → 4800) was improved as compared with Example 4, but other physical properties (flame retardancy (V0 → V1), toughness ( 12 → 5), the liquidity (220 → 155)) decreased. It is considered that the glass fiber length (1200 μm) in Example 8 exceeded the upper limit of an appropriate range, because physical properties other than rigidity were reduced. Further, in comparison with Example 4, it is considered that the screw length is preferably 80% or less.

(Comparative Example 1)
In the thermoplastic resin composition of Comparative Example 1, the screw length of Example 4 was changed to 70%, the screw length of Example 5 was changed to 30%, or the screw length of Example 8 was changed to 0%. All were prepared in the same manner as in Example 4 (or 5, 8) except for changing from the beginning to batch addition). As compared with Example 4, all the physical properties are reduced due to the difference in the screw length. In particular, the flame retardancy, toughness, and rigidity were reduced to values that would cause practical problems. Further, while the glass fiber length in Example 5 was 200 μm, the glass fiber length in Comparative Example 1 in which all the physical properties deteriorated and caused a practical problem was 100 μm. Therefore, it is considered that there is a lower limit value (for example, 150 μm) of the appropriate range of the glass fiber length between them.

(Comparative Example 2)
The thermoplastic resin composition of Comparative Example 2 was produced in the same manner as in Example 4 except that 1 part by mass of the lubricant “fatty acid amide S” (manufactured by Kao Corporation) in Example 4 was changed to 0 parts by mass (no lubricant). did. As a result, all physical properties (flame retardancy (V0 → HB), toughness (12 → 5), fluidity (220 → 140), rigidity (3700 → 3400)) were lower than those of Example 4. In particular, the fluidity decreased to a value at which practical problems occurred.

(Comparative Example 3)
The thermoplastic resin composition of Comparative Example 3 was prepared in the same manner as in Example 4 except that the glass fiber of Example 4 was changed to 70% from 70% of the screw length to 0%. As a result, all physical properties (flame retardancy (V0 → V1), toughness (12 → 5), fluidity (220 → 180), rigidity (3700 → 2600)) were lower than those of Example 4. In particular, the stiffness was reduced to a value at which practical problems occurred.

  The embodiments of the present invention have been described above. However, the present invention is not limited to those shown in the embodiments, and even if there are changes and additions without departing from the gist of the present invention, included.

Claims (9)

  A thermoplastic resin composition containing a polycarbonate resin, a flame retardant, an inorganic fiber, and a lubricant, wherein the thermoplastic resin composition has a flame retardancy of HB or more and a fluidity of 150 mm or more.   A thermoplastic resin composition containing a polycarbonate resin, a flame retardant, an inorganic fiber, a lubricant, and a silicone compound.The flame retardancy is HB or more, the toughness is 5 kJ / m2 or more, the fluidity is 150 mm or more, and the rigidity is 3300 MPa. The above thermoplastic resin composition.   0.1 to 5 parts by mass of a metal sulfonic acid salt as a flame retardant, 1 to 50 parts by mass of a glass fiber as an inorganic fiber, 0.1 to 10 parts by mass of a silicone compound, and a lubricant for 100 parts by mass of a polycarbonate resin. The thermoplastic resin composition according to claim 2, comprising 0.1 to 10 parts by mass and 0.1 to 5 parts by mass of a drip inhibitor. The sulfonic acid metal salt is a polystyrene sulfonic acid metal salt,
The drip inhibitor is a fluororesin,
The silicone compound is a polyorganosiloxane having an aromatic group,
The thermoplastic resin composition according to claim 3, wherein the lubricant is one or more selected from the group consisting of a fatty acid, a fatty acid ester, and a fatty acid aramid.   The flame retardancy of the thermoplastic resin composition is HB or more and 5 VA or less, and the toughness is 5 kJ / m2 or more and 100 kJ / m2 or less, the fluidity is 150 mm or more and 300 mm or less, and the rigidity is 3300 MPa or more and 7000 MPa or less. 5. The thermoplastic resin composition according to any one of 4.   The thermoplastic resin composition according to any one of claims 1 to 5, wherein the glass fiber has a fiber length of 150 µm or more and 1000 µm or less.   An exterior material part for a copying machine, comprising the thermoplastic resin composition according to any one of claims 1 to 6.   A method for producing a thermoplastic resin composition, comprising: first, melt-kneading a polycarbonate resin and a flame retardant;   The method for producing a thermoplastic resin composition according to claim 8, wherein the inorganic fiber and the lubricant are added in an amount of 50% to 80% of the screw length of the kneader.