JP2616877B2 - Organic fiber-based propylene resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic fiber propylene resin composition in which a crystalline propylene polymer is reinforced with fibers containing an inorganic filler. More specifically, the present invention relates to an organic fiber-based propylene resin composition having excellent heat resistance and rigidity and excellent in moldability suitable for uses such as industrial materials in which the physical properties of the crystalline propylene polymer are improved in a well-balanced manner as a whole.

[0002]

2. Description of the Related Art As a method for improving the rigidity, heat resistance and dimensional stability of a crystalline propylene polymer, a method of blending an organic or inorganic fibrous filler such as wood flour, cellulosic fiber, glass fiber or the like is known. Is well known. A composition having such properties is suitable for a molding material for automobile parts, and some compositions have been put to practical use.
Among them, a composition using polyester fiber waste generated as waste when producing polyester fiber as an organic fiber filler has a feature that physical strength can be improved for a low price. Therefore, it is preferably used as a molding material for automobile parts for parts that do not require high strength. However, the organic fiber-based propylene composition using polyester fibers is inferior in rigidity and heat resistance in comparison with the inorganic and organic fiber-based propylene compositions using wood flour, cellulosic fibers, and glass fibers. At present, it has not been widely used.

In order to compensate for such disadvantages of the polyester fiber, that is, rigidity and heat resistance, a method of further blending an inorganic filler such as talc with the organic fiber propylene composition using the polyester fiber has been proposed. Are known. However, in order to improve rigidity and heat resistance, it is necessary to mix a large amount of an inorganic filler with the composition. However, as a result, adverse effects such as a large increase in specific gravity and a decrease in impact resistance occur, so that it is absolutely necessary to limit the blending amount of the inorganic filler. However, the incorporation of a small amount of an inorganic filler cannot sufficiently improve the rigidity and heat resistance of the composition.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an organic fiber which is excellent in heat resistance, rigidity and moldability, and in which the physical properties of a conventional crystalline propylene polymer are improved in a well-balanced manner as a whole. An object of the present invention is to provide a propylene resin composition.

[0005]

Means for Solving the Problems As a result of intensive studies on the above-mentioned problems, the present inventors have found that a specific amount of an inorganic filler having a specific particle diameter is contained with respect to a specific crystalline propylene polymer. The present inventors have found that the intended purpose can be achieved by blending a specified amount of the polyester-based fiber thus obtained, and have completed the present invention. The present invention has the following configuration. (1) A composition comprising 10 to 100 parts by weight of a polyester fiber (B) with respect to 100 parts by weight of a crystalline propylene polymer (A). The polyester fiber (B) has a rate of 0.2 g / 10 min or more and 100 g / 10 min or less, and the polyester fiber (B) is composed of 100 parts by weight of polyethylene terephthalate and 10 to 30 parts by weight of an inorganic filler having an average particle diameter of 2 μm or less. An organic fiber-based propylene resin composition, which is a polyethylene terephthalate fiber containing a system filler or a composite fiber of the fiber with polyethylene terephthalate fiber occupying 80% or more of the fiber surface. (2) 100 to 100 parts by weight of the crystalline propylene polymer (A), 10 to 100 parts by weight of the polyester fiber (B),
0.1 to 30 parts by weight of the modified polyolefin (C), 0.1 to 5 parts by weight of the silane coupling agent (D), and 0.1 to 50 parts by weight of the inorganic filler (E), A composition in which the total amount of the additives (B) and (E) is 10 to 100 parts by weight, and the crystalline propylene polymer (A) has a melt flow rate of 0.2 g / 10 Min. And 100 g / 10 min. Or less, and the polyester fiber (B) is an inorganic filler-containing polyethylene terephthalate fiber comprising 100 parts by weight of polyethylene terephthalate and 10 to 30 parts by weight of an inorganic filler having an average particle size of 2 μm or less. Alternatively, the organic fiber-based propylene resin composition according to the above (1), wherein the fiber is a composite fiber with polyethylene terephthalate fiber occupying 80% or more of the fiber surface. (3) The organic fiber-based propylene resin composition according to the above (2), wherein the modified polyolefin (C) is obtained by graft polymerization of an olefin and an unsaturated monomer. (4) The organic fiber-based propylene resin composition according to the above (2), wherein the silane coupling agent (D) is an amino-based silane coupling agent.

[0006] The crystalline propylene polymer (A) blended in the organic fiber-based propylene resin composition of the present invention has a melt flow rate of 0.2 g / 10 min to 100 g / 10 min. Melt flow rate is 0.2g / 1
Since the crystalline propylene polymer for less than 0 minutes has poor melt fluidity, the polyester fibers and the inorganic filler are not uniformly dispersed in the molten crystalline propylene polymer during melt kneading, so that the physical properties deteriorate. Further, a crystalline propylene polymer having a melt flow rate of more than 100 g / 10 minutes has too high a fluidity, so that it becomes difficult to produce and mold an organic fiber-based propylene resin composition.
High physical properties cannot be expected.

The melt flow rate referred to in the present invention is the discharge amount of the molten crystalline propylene polymer flowing for 10 minutes when a load of 2.16 kg is applied at a temperature of 230 ° C.
It is measured according to JIS K-6758.

The crystalline propylene polymer (A) according to the present invention is not particularly limited as long as the melt flow rate is 0.2 g / 10 min or more and 100 g / 10 min or less. Examples are those comprising a copolymer resin containing 70 parts by weight or more of propylene and one or more types of α-olefins such as ethylene, butene-1, 4-methylpentene-1, hexene-1, and octene-1. Can be. In addition, the crystalline propylene polymer (A) as used herein refers to a compounding agent or other polymer usually used for a propylene polymer, such as various stabilizers, with respect to a propylene homopolymer or a copolymer. , Polyethylene, ethylene-propylene copolymer, ethylene-butene copolymer.

The polyester fiber (B) to be blended with the organic fiber propylene resin composition of the present invention is obtained by blending 10 to 30 parts by weight of an inorganic filler having an average particle size of 2 μm or less with 100 parts by weight of polyethylene terephthalate. A melt-spun inorganic filler-containing polyethylene terephthalate fiber or a composite fiber with polyethylene terephthalate fiber in which the fiber occupies 80% or more of the fiber surface. The polyethylene terephthalate used in the present invention is not particularly limited, but it is easy to obtain diamond rayite of Mitsubishi Rayon Co., Ltd., clappet of Kuraray Co., Ltd., and the like.

Examples of the inorganic filler contained in the inorganic filler-containing polyethylene terephthalate fiber used in the present invention include talc, calcium carbonate, aluminum silicate, barium sulfate, calcium sulfate and the like. Further, the average particle size of the inorganic filler must be 2 μm or less. When the average particle size exceeds 2 μm, the strength of the polyester fiber is reduced, and the physical properties of a product obtained from the organic fiber propylene composition are reduced. The amount of the inorganic filler in the inorganic filler-containing polyethylene terephthalate fiber is 10
If the amount is less than 10 parts by weight with respect to 0 parts by weight, there is no effect in improving heat resistance and rigidity, and if it exceeds 30 parts by weight, melt spinning becomes difficult.

When the polyester fiber (B) is a conjugate fiber, it may be either a sheath-core type conjugate fiber or a side-by-side conjugate fiber, but at least 80% of the surface of the conjugate fiber is filled with an inorganic type. Must be a polyethylene terephthalate fiber containing an agent. As a method for obtaining an inorganic filler-containing polyethylene terephthalate fiber or a polyethylene terephthalate fiber, an ordinary melting prevention method may be used. A composite material of these fibers can be easily obtained by performing a normal melting prevention method using a composite fiber die. The strength of the polyester fiber (B) is preferably 3 g / denier or more. This is because the use of the polyester fiber (B) having a fiber strength of 3 g / denier or more can improve heat resistance and rigidity without a significant increase in specific gravity.

The modified polyolefin (C) according to the present invention
Is preferably obtained by graft polymerization of an olefin monomer and an unsaturated monomer. Examples of the olefin monomer include propylene, and examples of the unsaturated monomer include maleic anhydride and acrylic acid.

The amount of the modified polyolefin (C) is preferably 0.1 to 30 parts by weight based on 100 parts by weight of the crystalline propylene polymer (A). The adhesive strength between the coalesced (A) and the polyester fiber (B) can be improved, and the overall physical property level of the organic fiber-based propylene resin composition can be improved. If the amount is less than 0.1 part by weight, the above effect cannot be obtained, and even if the amount exceeds 30 parts by weight, the effect obtained for the cost is reduced.

The silane coupling agent (D) according to the present invention
Examples thereof include amino-based, methacryloxy-based, glycidoxy-based, mercapto-based, and methyl-based coupling agents, and an amino-based silane coupling agent is preferable. The compounding amount of the silane coupling agent (D) is preferably 0.1 to 5 parts by weight with respect to 100 parts by weight of the crystalline propylene polymer (A). ) And the polyester fiber (B) are effective in improving the adhesive strength and improving the overall physical property level of the organic fiber-based propylene resin composition. If the amount is less than 0.1 part by weight, the above effects cannot be obtained, and even if the amount exceeds 5 parts by weight, the effect obtained for the cost is reduced.

In order to improve the adhesive strength between the crystalline propylene polymer (A) and the polyester fiber (B) and to improve the overall physical property level of the organic fiber propylene resin composition, the modified polyolefin (C) It is effective to use the silane coupling agent (D) together with the silane coupling agent.

The addition of an inorganic filler (E) to the organic fiber-based propylene resin composition of the present invention is effective for improving the dispersibility of the polyester-based fiber (B) and improving the mechanical strength. The amount of the inorganic filler (E) is 0.1 to 5 parts by weight based on 100 parts by weight of the crystalline propylene polymer (A).
0 parts by weight is preferable. If the amount is less than 0.1 parts by weight, the above effects cannot be obtained. If the amount exceeds 50 parts by weight, the obtained molded article becomes brittle. It is effective that the total amount of (B) + (E) is in the range of 10 to 100 parts by weight based on 100 parts by weight of the crystalline propylene polymer (A). If the addition amount is less than 10 parts by weight, the effect of improving the mechanical strength by the filler is small, and if it exceeds 100 parts by weight, poor dispersibility causes a reduction in moldability and a variation in mechanical strength.

Examples of the inorganic filler (E) include calcium carbonate, magnesium silicate, aluminum silicate, barium sulfate, calcium sulfate and talc, and those having an average particle size of 10 μm or less are preferred.

The organic fiber-based propylene resin composition is prepared by mixing various compounds using existing equipment such as a roving machine, a kneader, an extruder, a Banbury mixer, and a high-speed rotary mixer.
Kneading can be performed.

[0019]

EXAMPLES The present invention will now be described specifically with reference to examples and comparative examples, but the present invention is not limited to these examples. The physical properties of the molded articles in Examples and Comparative Examples were measured using the following methods. (1) Density: Based on JIS K7112. (2) Tensile strength: based on JIS K7113. (3) Elongation: Based on JIS K7113. (4) Flexural modulus: based on JIS K7203. (5) Flexural strength: based on JIS K7203. (6) Thermal deformation temperature: based on JIS K7207.

The component raw materials in the examples and comparative examples are as follows. 1) Crystalline propylene polymer (A) With respect to 100 parts by weight of a propylene homopolymer (manufactured by Chisso Corporation) having a melt flow rate of 9 g / 10 minutes, 0.5 polymer part of Ca-St, 1 part by weight of BHT, TINUVIN77
0 (manufactured by Nippon Ciba Geigy Co., Ltd.) was mixed in an amount of 0.5 part by weight, stirred and mixed by a mixer, and then melt-kneaded by an extruder heated to 230 ° C. to form pellets. 2) Polyester fiber (B) <Production method of polyethylene terephthalate fiber containing inorganic filler> Polyethylene terephthalate (manufactured by Kanebo):
Talc having an average particle size of 2 μm (manufactured by Hayashi Kasei Co., Ltd .: Micro White 500) as an inorganic filler with respect to Kanebo PET
0) was blended in a predetermined amount, and mixed by stirring with a mixer for 5 minutes, and then melt-spun at 300 ° C. to produce the following six types of polyester fibers (B) used in each Example. * Polyester fiber (B) having a fiber diameter of 5 denier, no talc blended, fiber strength of 5 g / denier (B) * 5 fiber denier, 5 wt.
g / denier polyester fiber (B) * Fiber diameter 10 denier, 10 parts by weight of talc blended, fiber strength 5 g / denier polyester fiber (B) * Fiber diameter 15 denier, talc 15 parts by weight, fiber strength 5 g / Denier polyester fiber (B) * Polyester fiber (B) with a fiber diameter of 20 denier, 20 parts by weight of talc, fiber strength of 5 g / denier * Fiber density of 25 denier, 35 parts by weight of talc, fiber strength of 5 g / denier Polyester-based fiber (B) <Method for producing composite fiber> A core of a composite fiber of a polyester fiber with a fiber diameter of 5 denier and no talc and an inorganic filler-containing polyester fiber with a fiber diameter of 5 denier and 5 parts by weight of talc. 75% of the surface of the composite fiber is filled with the inorganic filler-containing polyester fiber by the sheath-type composite die.
Polyester fiber (B) while adjusting to occupy
I got The fiber strength was 5 g / denier. 3) Modified polyolefin Obtained by graft polymerization of 0.4 part by weight of maleic anhydride with respect to 100 parts by weight of propylene monomer. 4) Silane coupling agent Silaace S320 manufactured by Chisso Corporation was used. ｛N- (2
-Aminoethyl) 3-aminopropyltrimethoxysilane 5) Inorganic filler Micron White 5000S manufactured by Hayashi Kasei Co., Ltd. is used. (Particle size distribution 0.5 to 3 μm)

Examples 1 to 13 and Comparative Examples 1 to 10 The above ingredients were blended in the amounts shown in Tables 1 to 3 below, and kneaded by heating at 190 ° C. in a kneader to melt the resin component. At the time when the polyethylene terephthalate fiber filler and the inorganic filler in the composition began to disperse, using an extruder, extruded at a resin temperature of 200 ° C.,
A pellet-shaped organic fiber propylene resin composition was obtained.
The composition was further subjected to injection molding (injection molding machine I manufactured by Toshiba Machine Co., Ltd.).
In S-100, a resin temperature of 200 ° C. and a mold temperature of 50
° C) to prepare various test pieces. Using these test pieces, the density, tensile strength, elongation, flexural modulus, flexural strength and heat deformation temperature were measured. The results are shown in Tables 1 to 3.

[0022]

From the above results, the organic fiber-based propylene resin composition of the present invention is excellent in heat resistance and rigidity, and improves the physical properties of the conventional crystalline propylene polymer in a well-balanced manner. It is clear that the composition has excellent moldability.

[0023]

[Table 1]

[0024]

[Table 2]

[0025]

[Table 3]

Claims (4)

(57) [Claims] 1. A composition comprising 100 parts by weight of a crystalline propylene polymer (A) and 10 to 100 parts by weight of a polyester fiber (B), wherein the crystalline propylene polymer (A) comprises: The melt flow rate is 0.2 g / 10 min or more and 100 g / 10 min or less, and the polyester fiber (B) is composed of 100 parts by weight of polyethylene terephthalate and 10 to 30 parts by weight of an inorganic filler having an average particle diameter of 2 μm or less. An organic fiber-based propylene resin composition comprising: an inorganic filler-containing polyethylene terephthalate fiber or a composite fiber comprising polyethylene terephthalate fiber occupying 80% or more of the fiber surface. 2. 100 parts by weight of a crystalline propylene polymer (A), 10 to 100 parts by weight of a polyester fiber (B), 0.1 to 30 parts by weight of a modified polyolefin (C), a silane coupling agent (D) is 0.1 to 5 parts by weight,
A composition in which 0.1 to 50 parts by weight of an inorganic filler (E) is added, and the total amount of the additives (B) and (E) is in a range of 10 to 100 parts by weight. The crystalline propylene polymer (A) has a melt flow rate of 0.2 g /
10 minutes or more and 100 g / 10 minutes or less, and the polyester-based fiber (B) is an inorganic filler-containing polyethylene terephthalate comprising 100 parts by weight of polyethylene terephthalate and 10 to 30 parts by weight of an inorganic filler having an average particle size of 2 μm or less. The organic fiber-based propylene resin composition according to claim 1, wherein the fiber is a fiber or a composite fiber with polyethylene terephthalate fiber occupying 80% or more of the fiber surface. 3. The organic fiber-based propylene resin composition according to claim 2, wherein the modified polyolefin (C) is obtained by graft polymerization of an olefin and an unsaturated monomer. 4. The organic fiber-based propylene resin composition according to claim 2, wherein the silane coupling agent (D) is an amino-based silane coupling agent.