JPH07102153A - Resin composition - Google Patents

Abstract

PURPOSE:To obtain a resin composition having excellent impact resistance, toughness, etc., and useful as a functional composite material for automobile, household appliance, etc., by compounding a thermoplastic polyester with an epoxy resin, a silane coupling agent and an inorganic filler. CONSTITUTION:This resin composition is produced by compounding (A) a thermoplastic polyester resin with (B) an epoxy resin of bisphenol-type, novolak-type, etc., (C) a silane coupling agent such as vinyltris (beta-methoxy)silane and y gamma- methacryloyloxypropyl trimethoxysilane and (D) an inorganic filler such as glass fiber, potassium titanate and quartz powder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin composition having excellent impact strength and toughness, which is useful as a functional composite material for automobiles, home electric appliances, electronic parts and the like.

[0002]

2. Description of the Related Art Conventionally, in order to improve mechanical properties such as strength and elastic modulus of resin, one or more kinds of fibrous or particulate fillers are added. Further, in order to improve the adhesion between the resin and the filler, the surface of the filler is modified with a coupling agent, or the coupling agent is directly mixed with the resin. Japanese Patent Publication No. 48-6175 discloses a resin composition to which an epoxy resin is added for the purpose of improving the strength of a polyester resin.
Japanese Patent Publication No. 29456 discloses a resin composition in which a moldability is improved by adding an epoxy compound and glass fiber to a polyethylene terephthalate resin.

[0003]

However, according to the above resin composition, although the tensile strength, the bending strength and the impact strength are improved, there is a problem that the tensile elongation is lowered, and the mechanical properties are improved. Is not yet in a satisfactory state. An object of the present invention is to provide a resin composition having improved properties such as tensile strength, bending strength, impact strength and tensile elongation and having high toughness.

[0004]

Means for Solving the Problems The inventors of the present invention have made extensive studies in view of such circumstances, and as a result, by blending an epoxy resin, a silane coupling agent and an inorganic filler with a thermoplastic polyester resin, The present inventors have found that an epoxy resin and a silane coupling agent improve the adhesiveness between a thermoplastic polyester resin and an inorganic filler, and have completed the present invention.

A typical compounding ratio of the resin composition of the present invention is as follows: thermoplastic polyester resin 38 to 94 parts by weight, epoxy resin 0.5 to 5.0 parts by weight, silane coupling agent 0.5.
To 2.0 parts by weight, and the inorganic filler is 5.0 to 60 parts by weight, and the compounding ratio of these varies depending on the type and molecular weight of the resin, the type of the inorganic filler, and the like. Further, in the practice of the present invention, two or more kinds of resin and inorganic filler may be mixed as long as the performance of the resin composition is not impaired.

The epoxy resin used in the resin composition of the present invention may be either a bisphenol type or a novolac type, but a novolac type having a high glass transition point is preferable. Further, in order to further improve the weld strength, an alicyclic epoxy resin having a slow crystallization rate is desirable.

The inorganic filler used in the resin composition of the present invention includes glass fiber, carbon fiber, metal fiber, potassium titanate, silicon carbide, talc, wollastonite, silicon nitride, aluminum borate, boric acid. Ceramic fibers such as magnesium and quartz powder are suitable.

The silane coupling agent used in the resin composition of the present invention includes vinyltris (βmethoxy) silane, vinyltriethoxysilane, vinyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane and γ-glycid. Xypropyltrimethoxysilane, γ
-Glycidoxypropylmethyldiethoxysilane, N-
β (aminoethyl) γ-aminopropyltrimethoxysilane, N-β (aminoethyl) γ-aminopropyldimethoxysilane, γ-aminopropyltriethoxysilane, N-phenyl-γ-aminopropyltrimethoxysilane and the like are used. .

In the production of the resin composition of the present invention, an epoxy resin obtained by liquefying or crushing a solid resin using a silane coupling agent and a solvent is added to a mixture of a thermoplastic polyester resin and an inorganic filler and mixed. The order and mixing method at the time of charging are not particularly limited, and when the inorganic filler has been surface-treated with a silane coupling agent in advance, addition of an epoxy resin is sufficient. The mixture thus obtained is 80
After drying at a temperature of ˜140 ° C. for about 5 hours, it is kneaded and melt-extruded at a temperature suitable for the resin using an extruder or the like to form a pellet.

In the resin composition of the present invention, a small amount of a releasing agent, a colorant, a heat stabilizer, an ultraviolet stabilizer, a foaming agent, a flame retardant, a flame retardant auxiliary agent is used within the range not departing from the object of the present invention. Additives such as rust preventives and antistatic agents may be included.

Next, the present invention will be specifically described by way of examples, but the present invention is not limited to these examples.

[0012]

【Example】

(Example 1) Polybutylene terephthalate [Brand name: Planac BT-1030, Dainippon Ink and Chemicals, Inc.]
69.5 parts by weight of novolac epoxy resin [trade name: DEN431, manufactured by Dow Chemical].
After adding and mixing 5 parts by weight and drying the mixture at 120 ° C. for 5 hours, a twin-screw extruder [trade name: TEM-35B,
Manufactured by Toshiba Machine Co., Ltd.] with a temperature of 240 ° C. and a rotation speed of 2
The mixture was kneaded at 00 rpm, and the kneaded product was previously mixed with a γ-aminopropyltrimethoxysilane coupling agent [trade name: KB
E903, manufactured by Shin-Etsu Chemical Co., Ltd.] surface-treated with aluminum borate whiskers having a fiber diameter of 0.5 to 1.0 μm and a fiber length of 10 to 20 μm (trade name: Arbolex YS)
3A, manufactured by Shikoku Chemicals Co., Ltd.] 30 parts by weight was charged from a side feeder and melt-extruded to obtain pellets. The pellets thus obtained were dried at a temperature of 120 ° C. for 5 hours, a test piece was prepared by injection molding, and the physical properties of the test piece were tested. The results of these measurements are shown in Table 1.

(Example 2) Using an aluminum borate whisker (trade name: Arbolex Y, manufactured by Shikoku Chemicals Co., Ltd.) which has not been surface-treated, a γ-aminopropyltrimethoxysilane coupling agent [commodity] Name: KB
E903, manufactured by Shin-Etsu Chemical Co., Ltd.] was added later, the same raw materials as in Example 1 were used, mixed in the mixing ratio shown in Table 1, pelletized in the same manner as in Example 1, and When the same treatment was performed to prepare a test piece and a physical property test was performed, these measurement results were as shown in Table 1.

Comparative Example 1 Using the same polybutylene terephthalate 69.5 parts by weight as used in Example 2, 30 parts by weight of aluminum borate whiskers and 0.5 parts by weight of novolac epoxy resin, the same procedures as in Example 1 were carried out. Pellets were formed by the same method and treated in the same manner to prepare test pieces, and the physical properties were tested. The results of these measurements are shown in Table 1.

Comparative Example 2 Pelletization was carried out in the same manner as in Example 1 using 70 parts by weight of the same polybutylene terephthalate and 30 parts by weight of aluminum borate whiskers used in Example 1, and the same treatment was carried out. Then, a test piece was prepared and a physical property test was conducted, and the measurement results were as shown in Table 1.

[0016]

[Table 1]

(Example 3) As a thermoplastic polyester resin, polybutylene terephthalate [trade name: PLANAC BT-1030, manufactured by Dainippon Ink and Chemicals, Inc.] 2
Using the same raw materials as used in Example 1, except that a mixture of 0.5 parts by weight and 49.0 parts by weight of polycarbonate [trade name: Iupilon E2000F, manufactured by Mitsubishi Gas Chemical Co., Inc.] was used, The mixture was mixed in the mixing ratio shown in Table 2, pelletized by the same method as in Example 1, and treated in the same manner to prepare a test piece, and a physical property test was conducted. The measurement results are shown in Table 2. It was as it was.

Example 4 The epoxy resin used in Example 3 was replaced with an alicyclic epoxy resin [trade name: Celoxite 202].
1, manufactured by Daicel Chemical Industries, Ltd.] except that the same raw materials as those used in Example 3 were used, mixed at the compounding ratio shown in Table 2, pelletized in the same manner as in Example 1, and When this was treated in the same manner to prepare a test piece and a physical property test was conducted, these measurement results were as shown in Table 2.

Comparative Example 3 Pellets were prepared in the same manner as in Example 1 using 21 parts by weight of the same polybutylene terephthalate as used in Example 3, 49.0 parts by weight of polycarbonate and 30 parts by weight of aluminum borate whiskers. Then, a test piece was prepared by subjecting it to the same treatment as above, and a physical property test was conducted. The results of these measurements were as shown in Table 2.

[0020]

[Table 2]

Example 5 The same raw materials as those used in Example 1 were used except that polybutylene terephthalate was replaced with polyethylene terephthalate (intrinsic viscosity 0.67) in Example 1, and the mixing ratio shown in Table 3 was used. Were mixed, pelletized by the same method as in Example 1, and treated in the same manner to prepare a test piece, and a physical property test was conducted. The measurement results are shown in Table 3.

Comparative Example 4 Pellets were prepared in the same manner as in Example 1 using 70 parts by weight of the same polyethylene terephthalate used in Example 5 and 30 parts by weight of the same aluminum borate whiskers used in Example 2. Then, this was treated in the same manner and a test piece was prepared and a physical property test was conducted. The results of these measurements were as shown in Table 3.

[0023]

[Table 3]

[0024]

From the results of the examples, since the resin composition of the present invention contains the inorganic filler modified by using the epoxy resin and the silane coupling agent in combination, the silane coupling agent or the epoxy resin is used. Mechanical properties such as tensile strength, tensile elongation, flexural strength, flexural modulus, and Izod impact strength are dramatically improved compared to resin compositions using resin alone, and it has excellent reinforcing performance. It is a thing. Further, even if different kinds of resins are mixed in a high ratio, the effect can be maintained. Thus, the resin composition of the present invention is excellent in impact strength and toughness,
It is useful as a functional composite material for automobiles, home appliances and electronic parts.

Claims (1)

[Claims] 1. A resin composition comprising a thermoplastic polyester resin, an epoxy resin, a silane coupling agent and an inorganic filler.