JP3479790B2 - Polycarbonate resin composition for injection molding - Google Patents

Description

BACKGROUND OF THE INVENTION [0001] Field of the Invention The present invention is morphism excellent moldability
The present invention relates to a polycarbonate resin composition for out-molding . 2. Description of the Related Art Polycarbonate resins are currently used as engineering plastics having excellent heat resistance, mechanical strength (particularly impact strength), dimensional stability, electrical properties, transparency, hygiene, etc., and are currently used for electrical, electronic and OA applications. Widely used in various fields such as precision machinery, automobile, medical care, security, household goods, etc. As described above, a polycarbonate resin has various characteristics required as an engineering plastic, and thus has a great feature that it can be used for a wide range of applications, but has a high melt viscosity and is inferior in moldability. [0004] Conventionally, polycarbonate resins have a high melt viscosity, so that a molded product by injection molding requires 30 minutes.
Measures such as molding at a high temperature of 0 ° C. or higher or reducing the molecular weight of the polycarbonate resin have been taken. However, molding at a high temperature inevitably decomposes the polycarbonate resin, deteriorating the color tone of the resin and lowering the molecular weight, causing problems such as poor appearance and insufficient strength of the resulting molded product. Further, when the molecular weight of the resin is reduced, a problem in strength often occurs. As a method for improving the melting properties of the polycarbonate resin, a method of using a polycarbonate resin having a branch, a method of mixing two kinds of polycarbonate resins having different molecular weights, and a method of modifying the polycarbonate resin (JP-A-54-14633). JP-A-56-45945, JP-A-58-138733, JP-A-64-74220, and
231919) has been proposed, but the operation is complicated or the balance between moldability and physical properties is not always sufficient. SUMMARY OF THE INVENTION The present invention relates to a polycarbonate for injection molding which has improved flowability during heating and melting and has excellent moldability without impairing the excellent properties of the polycarbonate resin. An object of the present invention is to provide a resin composition. [0007] In order to solve the above problems, the present invention has proposed the following polycarbonate resin composition. That is, morphism that feature be contained 1 to 10% by weight terpene resin to a polycarbonate resin
It is a polycarbonate resin composition for out-molding . The polycarbonate resin used in the present invention is a polymer obtained by reacting a dihydroxy aromatic compound with phosgene (phosgene method) or a polymer obtained by reacting a dihydroxy aromatic compound with a diaryl carbonate (ester exchange). Method). Further, a polycarbonate resin containing a reinforcing agent such as glass fiber and a filler is also used. Here, the dihydroxy aromatic compound is an aromatic compound having two hydroxy groups in an aromatic nucleus. Examples thereof include bisphenol A, bisphenol S, hydrogenated bisphenol A, bisphenol F, and 2,2-bis. (4-hydroxy-3,5-dimethylphenyl) propane, bis (4-hydroxy-3,5-dimethylphenyl) sulfone, 1,1-bis (4-hydroxyphenyl) cyclohexane and the like. The diaryl carbonate includes, in addition to diphenyl carbonate, substituted diphenyl carbonate in which an aromatic nucleus is substituted with a carbomethoxy group, a nitro group, a cyano group, a chloro group, an isopropyl group and the like. The terpene resin used in the present invention may be a terpene monomer alone or a terpene monomer and an aromatic monomer in an organic solvent in the presence of a Friedel-Crafts catalyst.
Or it is obtained by copolymerizing a terpene monomer and a phenol. Further, a hydrogenated terpene-based resin obtained by subjecting the obtained terpene-based resin to a hydrogenation treatment may be used. As terpene monomers, α-pinene, β-
Examples include pinene, dipentene, and d-limonene, and examples of the aromatic monomer include styrene, α-methylstyrene, and vinyltoluene. Phenols include phenol, cresol, bisphenol A and the like. The terpene-based resin thus obtained is obtained, for example, from "Yasuhara Chemical Co., Ltd."
(Terpene resin), "YS resin TO" (aromatic modified terpene resin), "YS resin TR" (aromatic modified terpene resin), "Clearon" (hydrogenated terpene resin), "Y
S-Polyster "(terpene phenolic resin) and" Mighty Ace "(terpene phenolic resin) are commercially available and can be easily obtained.The compounding amount of the terpene resin compounded in the present invention is 1 to 10. If the amount is less than 1% by weight, the effect of modifying the moldability (flowability) is poor, and if it exceeds 10% by weight, the thermal and mechanical properties are reduced. When the polycarbonate resin composition of the present invention is used for injection molding, a molded article having excellent moldability can be obtained without impairing the excellent properties of the polycarbonate resin. The present invention will be described more specifically with reference to the following examples: Example 1 Polycarbonate resin "PANLITE K" manufactured by Teijin Chemicals Limited.
-1300 "(high viscosity, high strength type) at 120 ° C for 5
After sufficient preliminary drying for 3 hours, 3% by weight of a terpene resin “Mighty Ace G-150” (terpene phenol resin) manufactured by Yashara Chemical Co., Ltd. was dry-blended and melt-mixed using a twin-screw extruder to form pellets. The pellets were evaluated for fluidity (moldability) by a spiral flow mold using an injection molding machine. Further, various test pieces conforming to ASTM were injection-molded, and the mechanical properties were evaluated. The results are shown in Table 1. The details of the preparation and evaluation method of the test piece were performed by the following method. (1) Melt mixing conditions Equipment used: Labo Plast Mill (manufactured by Toyo Seiki Seisaku-sho, Ltd.) Twin screw extruder, D = 20 mm, L / D = 25 Mixing conditions: 260-290 ° C. × 70 rpm Compounding conditions: dry blending ( 2) Fluidity test (spiral flow length, molding evaluation) Equipment used: injection molding machine "Nikko N100B type" 1) Cylinder temperature: H1 / H2 / H3 / H4 / H5 /
Nozzle = 260/300/300/300/300/3
00 ° C 2) Mold: 2mm spiral flow mold 3) Mold temperature: 80 ° C 4) Evaluation injection pressure: 12,220,980,730Kg / c
3 points m ² 5) Injection time: 20sec, cooling time: 20sec 6) Weighing position: 50 mm, cylinder allowance: 5 to 10 m
m (3) Preparation of test piece Used equipment: injection molding machine "Nikko N100B type" 1) Cylinder temperature: H1 / H2 / H3 / H4 / H5 /
Nozzle = 260/300/300/300/300/3
00 ° C 2) Mold temperature: 80 ° C 3) Injection pressure: 1220 (gauge pressure: 100 kg / cm)
² ) 4) Injection time: 20 sec, cooling time: 20 sec 5) Measuring position: 50 mm, cylinder allowance: 5 to 10 m
m 6) Molded test piece: dumbbell 1 for ASTM tensile test
No., bending, Izod impact, thermal deformation test specimen (4) Mechanical property test 1) Tensile strength (according to ASTM D638) Equipment: Shimadzu Autograph AGS-10KND Tensile speed: 50 mm / min Measurement temperature, humidity: 23 ° C. 50% 2) Flexural strength and flexural modulus (according to ASTM D790) Equipment: Shimadzu Autograph AGS-10KND Bending speed: 3 mm / min Measurement temperature, humidity: 23 ° C, 50% 3) Izod impact strength (as per ASTM D256) Apparatus) Device: IMPACT TESTAR (manufactured by Toyo Seiki Seisaku-sho, Ltd.) W = 1.754 Kg, R = 17.957 cm, α = 12
5 ° 58 ′ 4) Thermal deformation temperature (according to ASTM D648) Apparatus: Fully automatic thermal deformation temperature tester (manufactured by Yasuda Seiki Seisakusho) Bending stress: 4.6 kg · f / cm ² Example 2 Example 1 Was evaluated in the same manner as in Example 1 except that the amount of Mighty Ace G150 used in Example 2 was changed from 3% by weight to 5% by weight. The results are shown in Table 1. Example 3 Evaluation was performed in the same manner as in Example 1 except that the amount of Mighty Ace G150 used in Example 1 was changed from 3% by weight to 10% by weight. The results are shown in Table 1. Example 4 Evaluation was performed in the same manner as in Example 1 except that the amount of Mighty Ace G150 used in Example 1 was changed from 3% by weight to 1% by weight. The results are shown in Table 2. Example 5 3% by weight of Mighty Ace G150 used in Example 1 was hydrogenated terpene resin, Yashara Chemical Co., Ltd.
Evaluation was performed in exactly the same manner as in Example 1 except that 3% by weight of Clearon P-125 was used. The results are shown in Table 2. Example 6 3% by weight of Mighty Ace G150 used in Example 1 was hydrogenated terpene resin, Yashara Chemical Co., Ltd.
Evaluation was performed in exactly the same manner as in Example 1 except that the amount was changed to 5% by weight of Clearon P-125. The results are shown in Table 2. Example 7 3% by weight of Mighty Ace G150 used in Example 1 was replaced with an aromatic modified terpene resin "YS Resin TO-".
Evaluation was performed in the same manner as in Example 1 except that the weight was changed to 5% by weight of 125 ″ (manufactured by Yashara Chemical Co., Ltd.). The results are shown in Table 3. Example 8 Example 8 was used in Example 1. 3 wt% of Mighty Ace G150 is a terpene resin “YS resin PX-1250”
(Yashara Chemical Co., Ltd.) was evaluated in the same manner as in Example 1 except that the weight was changed to 5% by weight. Table 3 shows the results
It was shown to. Comparative Example 1 Evaluation was performed in the same manner as in Example 1 except that 3% by weight of Mighty Ace G150 used in Example 1 was not used at all. The results are shown in Table 4. Comparative Example 2 Evaluation was performed in the same manner as in Example 1 except that the amount of Mighty Ace G150 used in Example 1 was changed from 3% by weight to 0.5% by weight. The results are shown in Table 4. Comparative Example 3 Evaluation was performed in the same manner as in Example 1 except that the amount of Mighty Ace G150 used in Example 1 was changed from 3% by weight to 15% by weight. The results are shown in Table 4. [Table 1] [Table 2] [Table 3] [Table 4] From the evaluation results shown in Tables 1 to 4, the polycarbonate resin composition of the present invention containing 1 to 10% by weight of a terpene resin shows various mechanical properties (tensile strength, flexural strength, thermal deformation). It can be seen that the fluidity (moldability) is improved without significantly lowering the temperature and impact strength. The polycarbonate resin composition for injection molding of the present invention does not require a complicated chemical treatment which increases the cost, and simply blends the terpene resin to obtain the excellent properties of the polycarbonate resin. An improvement in fluidity (moldability) can be achieved without impairment, and this is extremely useful industrially.

Claims (1)

(57) [Claim 1] A polycarbonate resin composition for injection molding comprising a polycarbonate resin and a terpene resin in an amount of 1 to 10% by weight.