JP2016191035A - Filler composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filler for a resin capable of manufacturing a resin molded body exhibiting shock resistance and rigidity at high level balance.SOLUTION: There is provided a filler composition containing a fibrous basic magnesium sulfate particle and a non-fibrous inorganic fine particle with average particle diameter in a range of 0.001 to 0.5 μm at a mass ratio in a range of 100:0.001 to 100:50.SELECTED DRAWING: None

Description

  The present invention relates to a filler composition, and more particularly to a filler composition that can be filled into a polyolefin resin to improve various physical properties of the polyolefin resin molded body.

  Polyolefin resin, represented by polypropylene resin, is used as a material for the manufacture of exterior and interior materials for automobiles, exterior materials for household appliances such as refrigerators and washing machines, and various molded products such as trays, shelves and packaging sheets. Widely used. And in order to improve physical properties such as rigidity and impact resistance of the polyolefin resin molded body, it is widely used as a polyolefin resin composition in which a filler (filler) is added to a polyolefin resin as a molding material. Yes. As fillers used for such purposes, fibrous inorganic fillers and non-fibrous inorganic fillers are common.

  In Patent Document 1, there is little mold contamination at the time of molding, it is excellent in antistatic property, stability against light deterioration and molding processability, and has a good balance between high rigidity and impact resistance, so that it is a molded body. In this case, as a polypropylene resin composition capable of obtaining a molded body having excellent flow mark and weld appearance, an inorganic filler (or 99 to 60 parts by mass of a polypropylene polymer and an average particle diameter of 0.01 to 100 μm) (or A polypropylene resin composition containing 1 to 40 parts by mass of an inorganic filler) and 0.05 to 5 parts by mass of a specific hindered amine light stabilizer is described. And it is described that a non-fibrous inorganic filler, a fibrous inorganic filler, or a mixture thereof can be used as the inorganic filler.

  Patent Document 2 discloses a filler composition containing inorganic fibers made of an inorganic material and spherical silica particles having a volume average particle diameter of 0.01 μm or more and 5 μm or less as a filler composition filled in a resin typified by an epoxy resin. Things are listed. According to this document, the resin composition containing the filler composition is said to be excellent in flow characteristics, and as an example of inorganic fibers, for example, a carbon material having an aspect ratio of 5 or more or a carbon material as a main component is used. And glass and glass-based materials are described.

JP 2009-167407 A Japanese Patent Laid-Open No. 2015-13978

One of the recent improvement themes of automobiles is to reduce the weight of the vehicle body for the purpose of saving fuel. For example, in an exterior material such as an automobile bumper, it has been studied to reduce the thickness in order to reduce the weight. However, in the bumper of an automobile, even when the thickness is reduced, it is not easily deformed due to high impact resistance and the action of external force so as not to be easily damaged by an impact caused by contact with another automobile or various objects. High rigidity is required. However, in the polypropylene resin composition that is widely used as a material for automobile bumpers, the impact resistance and rigidity of the molded product are generally in a trade-off relationship.
It is known that the other physical property tends to be low.

  The inventor of the present invention studied the use of the fillers described in Patent Documents 1 and 2 as the filler for polyolefin resin. As a result, when a thin molded article is produced using a polyolefin resin composition to which fillers described in those documents are added, it exhibits high impact resistance as required in automobile bumpers. It has been found that it is difficult to produce a molded body without sacrificing rigidity.

Accordingly, the object of the present invention is to provide a filler composition particularly suitable as a filler for polyolefin resins used in the production of resin moldings such as automobile bumpers that require a high level of impact resistance and rigidity. To provide things. In particular, the present invention provides a filler composition for filling a polyolefin resin useful as a material for producing a polyolefin resin molded article having improved impact resistance without sacrificing the high rigidity exhibited by a polyolefin resin molded article typified by a polypropylene resin molded article. To provide things.
The object of the present invention is, secondly, a filler composition suitable also as a filler for polyolefin resins used in the production of interior materials that are desired to be further thinner and lighter like automotive instrument panels. Is to provide.

  The inventors of the present invention have a mass ratio of fibrous basic magnesium sulfate particles and fine non-fibrous inorganic fine particles having an average particle diameter in the range of 0.001 to 0.5 μm to a polyolefin resin such as polypropylene resin. The resin molded body produced using the resin composition prepared by adding the filler composition contained in such an amount as to be in the range of 100: 0.001 to 100: 50 is a flexural modulus that is an index of rigidity. The present invention was completed by finding that the Izod impact strength, which is an index of impact resistance, can be significantly improved without lowering.

  Accordingly, the present invention provides fibrous basic magnesium sulfate particles and non-fibrous inorganic fine particles having an average particle diameter in the range of 0.001 to 0.5 μm in a mass ratio of 100: 0.001 to 100: 50. The filler composition contains in a range of amounts.

Preferred embodiments of the filler composition of the present invention are as follows.
(1) The non-fibrous inorganic fine particles are spherical oxide particles, particularly spherical silicon dioxide particles.
(2) For filling polyolefin resin.

  Since the molded body produced using the polyolefin resin composition to which the filler composition of the present invention is added exhibits high impact resistance and rigidity, it can be advantageously used as an exterior material such as an automobile bumper. Moreover, the molded object manufactured using the polyolefin resin composition which added the filler composition of this invention can be advantageously used also as automobile interior materials, such as an instrument panel.

  The filler composition of the present invention contains fibrous basic magnesium sulfate particles and fine non-fibrous inorganic fine particles having an average particle diameter in the range of 0.001 to 0.5 μm. It is preferable that the non-fibrous inorganic fine particles adhere to the surface of the fibrous basic magnesium sulfate particles. The content of the non-fibrous inorganic fine particles with respect to 100 parts by mass of the fibrous basic magnesium sulfate particles is in the range of 0.001 to 50, preferably in the range of 0.001 to 20 parts by mass, more preferably 0.00. The amount is in the range of 001 to 8 parts by mass, particularly preferably in the range of 0.005 to 2 parts by mass.

Fibrous basic magnesium sulfate particles generally have an average major axis in the range of 5-50 μm, preferably in the range of 10-30 μm, and an average minor axis in the range of generally 0.1-2.0 μm, preferably 0.5- The average aspect ratio (average major axis / average minor axis) is generally 2 or more, preferably 5 or more, and particularly preferably 5 to 50. The average major axis and the average minor axis of the fibrous basic magnesium sulfate particles mean the average values of the major axis and the minor axis of 1000 particles measured from an enlarged image by a scanning electron microscope (SEM).

  The non-fibrous inorganic fine particles used in the present invention have an average particle size (average particle size of primary particles) in the range of 0.001 to 0.5 μm (1 nm to 500 nm), preferably 0.002 to 0.2 μm (2 nm). ˜200 nm), particularly preferably in the range of 0.005 to 0.1 μm (5 nm to 100 nm). The average particle diameter of the non-fibrous inorganic fine particles is also generally in the range of 1/2 to 1/1000, preferably in the range of 1/2 to 1/500, with respect to the average short diameter of the fibrous basic magnesium sulfate particles. Particularly preferred is a length in the range of 1/5 to 1/500. The average particle diameter of the non-fibrous inorganic fine particles can be measured using, for example, image analysis of a SEM photograph or a particle size distribution measuring apparatus.

  Examples of non-fibrous inorganic fine particles include silicon dioxide particles, magnesium oxide particles, magnesium hydroxide particles, basic magnesium carbonate particles, and calcium carbonate particles. The non-fibrous inorganic fine particles are preferably spherical particles. Here, the spherical particles mean that the average aspect ratio (average major axis / average minor axis) is less than 2, preferably 1.5 or less. The non-fibrous inorganic fine particles are preferably spherical silicon dioxide particles.

  The filler composition of the present invention can be produced, for example, by mixing fibrous basic magnesium sulfate particles and non-fibrous inorganic fine particles. Mixing may be performed by dry mixing using a dry mixing apparatus, or may be performed by wet mixing using a liquid dispersion medium. In order to uniformly disperse the fibrous basic magnesium sulfate particles and the non-fibrous inorganic fine particles, it is preferable to use wet mixing.

  Examples of the mixing apparatus used in dry mixing include a high-speed rotary mill (eg, cutter mill, cage mill, hammer mill, pin mill, turbo type mill, centrifugal classification mill) and jet mill.

  Examples of the dispersion medium used in wet mixing include water, lower alcohols, and ketones. Wet mixing is a method of mixing a dispersion of fibrous basic magnesium sulfate particles and a dispersion of non-fibrous inorganic fine particles, and mixing a dispersion of fibrous basic magnesium sulfate particles and a powder of non-fibrous inorganic fine particles. , A method of mixing fibrous basic magnesium sulfate particle powder with a dispersion of non-fibrous inorganic fine particles, a mixture of fibrous basic magnesium sulfate particle powder, non-fibrous inorganic fine particle powder and a liquid medium You may carry out by any method of the method to do. Examples of the mixing device used in the wet mixing include a stirrer and a medium stirring mill. In addition, a rotary disperser such as an ultrasonic disperser and a homomixer, a high-pressure homomixer, a wet jet mill, and the like can also be used.

  The filler composition of the present invention may be surface-treated with a coupling agent in order to increase the affinity for the resin. Examples of the coupling agent include an alkoxysilane having at least one functional group selected from the group consisting of phenyl group, vinyl group, epoxy group, methacryl group, amino group, ureido group, mercapto group, isocyanate group and acrylic group ( Silane coupling agent).

The filler composition of this invention can be added to both a thermoplastic resin and a thermosetting resin. Examples of the thermoplastic resin include a polyolefin resin, a polyester resin, a polyamide resin, and a polyacrylic resin. Examples of polyolefin resins include ethylene homopolymers, propylene homopolymers, ethylene and propylene copolymers, ethylene and α-olefin copolymers, and propylene and α-olefin copolymers. Can be mentioned. Examples of the polyester resin include polyethylene terephthalate and polybutylene terephthalate. Examples of the polyamide resin include 6-nylon and 6,6-nylon. Examples of the polyacrylic resin include polycarbonate, polyetherimide, and polymethyl methacrylate. Examples of thermosetting resins include epoxy resins, phenol resins, and urethane resins.

  The amount of the filler composition added to the resin is generally in the range of 99: 1 to 50:50, preferably in the range of 99: 1 to 70:30, as a mass ratio of the resin to the filler composition (the former: the latter). Is the amount. For the addition of the filler composition to the resin, a kneading machine such as a uniaxial melt kneading extruder, a biaxial melt kneading extruder, or a Banbury mixer can be used. Resins such as antioxidants, UV absorbers, pigments, antistatic agents, corrosion inhibitors, flame retardants, lubricants, neutralizers, foaming agents, plasticizers, anti-bubble agents, and crosslinking agents, as well as filler compositions Additives generally used for improving the physical properties and characteristics of the composition may be added.

  The resin composition to which the filler composition of the present invention is added can be formed into a resin molded body using any molding method. Examples of molding methods include injection molding methods, extrusion molding methods, calendar molding methods, blow molding methods, foam molding methods and stretch molding methods.

[Comparative Example 1]
85 parts by mass of polypropylene resin [MFR (temperature 230 ° C., load 2.16 kg): 52 g / min], and fibrous basic magnesium sulfate particles (MOS A-1, manufactured by Ube Materials Co., Ltd., average major axis: 15 μm) , Average minor axis: 0.5 μm) at a ratio of 15 parts by mass. The obtained mixture was melted under the conditions of a temperature of 230 ° C. and a shaft rotation speed of 250 rpm using a twin-screw melt kneading extruder (Laboplast Mill Micro, L / D = 18, manufactured by Toyo Seiki Seisakusho Co., Ltd.). The resulting melt-kneaded product was kneaded and extruded into a strand shape, and then cut to obtain a polypropylene resin composition pellet containing fibrous basic magnesium sulfate particles.

  The obtained polypropylene resin composition pellets were injection molded using a small injection molding machine (TE3-1E, manufactured by Nissei Plastic Industry Co., Ltd.) to prepare a test piece. The test piece was a 1BB type (small dumbbell) test piece specified by JIS-K-7162.

When the Izod impact strength and the flexural modulus were measured by the following method using the above test piece, the Izod impact strength was 3.7 kJ / m ² and the flexural modulus was 3.5 GPa.

Izod impact strength: Measured by a method based on JIS-K-7110 using a notching machine (manufactured by Imoto Seisakusho Co., Ltd.).
Flexural modulus: Measured using a universal testing machine (Strograph VGF, manufactured by Toyo Seiki Seisakusho Co., Ltd.).

[Example 1]
100 parts by mass of fibrous basic magnesium sulfate particles used in Comparative Example 1 and 0.15 parts by mass of spherical silica particles (Admanano, manufactured by Admatechs, average particle size: 10 nm, measured by SEM) The filler composition was prepared by dry mixing.
Except that 15 parts by mass of the filler composition prepared above was added to 85 parts by mass of the polypropylene resin, a polypropylene resin composition pellet was produced in the same manner as in Comparative Example 1, and this pellet was used to produce Comparative Example 1. A test piece was prepared in the same manner as described above. When the Izod impact strength and the flexural modulus were measured using this test piece, the flexural modulus was the same value as the test piece prepared in Comparative Example 1, but the Izod impact strength was in Comparative Example 1. It was confirmed that the value was much higher than that of the test piece prepared.

[Comparative Example 2]
85 parts by mass of polypropylene resin [MFR (temperature 230 ° C., load 2.16 kg): 52 g / min] and 15 parts by mass of the fibrous basic magnesium sulfate particles prepared in Comparative Example 1 were mixed. The resulting mixture was melt-kneaded using a twin-screw melt-kneading extruder (L / D = 25, manufactured by Imoto Seisakusho Co., Ltd.) at a temperature of 230 ° C. and a shaft rotation speed of 90 rpm. The kneaded product was extruded into strands and then cut to obtain polypropylene resin composition pellets containing fibrous basic magnesium sulfate particles.

  The obtained polypropylene resin composition pellets were injection molded at a cylinder temperature of 230 ° C. and a mold temperature of 50 ° C. using a small injection molding machine (manual injection molding machine, Shinsei Serbit, Handy Try), and a test piece (Strip shape, width 5 mm × thickness 2 mm × length 50 mm) was prepared. Using this test piece, Izod impact strength and flexural modulus were measured by the following method. The measurement results are shown in Table 1.

Izod impact strength: Measured according to JIS-K-7110 using an Izod impact tester (manufactured by Mize Tester).
Bending elastic modulus: Using an electric measuring stand (manufactured by Imada Co., Ltd., MX-500N) + a digital force gauge (manufactured by Imada Co., Ltd., ZTA-500N) under the conditions of a load speed of 10 mm / min and a distance between fulcrums of 40 mm. It was measured.

[Example 2]
A filler composition was prepared by dry-mixing 100 parts by mass of fibrous basic magnesium sulfate particles used in Comparative Example 1 and 0.015 parts by mass of spherical silica particles.
A polypropylene resin composition pellet was produced in the same manner as in Comparative Example 2 except that 15 parts by mass of the filler composition prepared above was added to 85 parts by mass of the polypropylene resin. A test piece was prepared in the same manner as described above. Using this test piece, Izod impact strength and flexural modulus were measured. The measurement results are shown in Table 1.

[Example 3]
A filler composition was prepared in the same manner as in Example 2 except that the spherical silica particles mixed with 100 parts by mass of the fibrous basic magnesium sulfate particles were changed to 0.15 parts by mass. Product pellets were produced. A test piece was prepared using this pellet, and Izod impact strength and flexural modulus were measured. The measurement results are shown in Table 1.

[Example 4]
A filler composition was prepared in the same manner as in Example 2 except that the spherical silica particles mixed with 100 parts by mass of the fibrous basic magnesium sulfate particles were changed to 1.5 parts by mass. Product pellets were produced. A test piece was prepared using this pellet, and Izod impact strength and flexural modulus were measured. The measurement results are shown in Table 1.

Table 1
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Izod impact strength Flexural modulus
(KJ / m ² ) (GPa)
―――――――――――――――――――――――――――――――――――――――― Comparative Example 2 2.1 2.8
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Example 2 2.4 3.0
Example 3 2.7 3.1
Example 4 3.0 3.1
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Claims (3)

  It includes fibrous basic magnesium sulfate particles and non-fibrous inorganic fine particles having an average particle diameter in the range of 0.001 to 0.5 μm in an amount in the range of 100: 0.001 to 100: 50 by mass ratio. Filler composition.   The filler composition according to claim 1, wherein the non-fibrous inorganic fine particles are spherical silicon dioxide particles.   The filler composition according to claim 1, which is used for filling a polyolefin resin.