JPH10130438A - Resin molding having wood-like texture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polyolefin resin molding having both a wood-like texture and high impact strength. SOLUTION: This molding is formed from a polyolefin resin consisting of 100 pts.wt. polypropylene resin having a melt flow rate(MFR) at 230 deg.C of 0.01-40g/10min and a flexural modulus of at least 12,000kgf/cm<2> , 20-200 pts.wt. wood flour having a mean particle diameter of at most 200μm, and 10-100 pts.wt. inorganic filler and has an Izod impact value at 23 deg.C of at least 2kgf.cm/cm<2> .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin molded article having a wooden texture, and more particularly, to a wooden molded article formed from a polyolefin resin composition and used in place of wood for building materials inside and outside houses. And a resin molded article having:

[0002]

2. Description of the Related Art Conventionally, for the purpose of imparting the feel of wood to a synthetic resin such as a polyolefin resin, a resin molded product obtained by compounding a woody material such as wood flour or wood crushed pieces is used for building materials. Many attempts have been made. For example, JP-A-8-100086 discloses a resin composition obtained by mixing wood flour and a polyolefin resin. However, such a resin composition has low impact properties,
When a molded article is nailed, it cannot be punched well and cannot be used as a substitute for wood.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a polyolefin resin molded article having both a wooden feeling and high impact strength. .

The present invention provides (a) 230
Melt flow rate (MFR) at 0 ° C is 0.01 to
40 g / 10 min and a flexural modulus of 120
Polypropylene resin 1 with a weight of 00 kgf / cm ² or more
00 parts by weight, and (b) wood flour 2 having an average particle size of 200 μm or less
It is formed of a polyolefin resin composition comprising 0 to 200 parts by weight and (c) 10 to 100 parts by weight of an inorganic filler, and has an Izod impact value at 23 ° C. of 2 kgf · cm.
/ Cm ² or more, and has a gist thereof.

[0004] The melt flow rate (MFR) at 230 ° C of the polypropylene resin used in the present invention is as follows:
JIS K7210 (test temperature 230 ° C, test load 2.
16 kgf), and is 0.01 to 40 g /
10 min, preferably 0.1 to 30 g / 10 min. If the MFR is less than 0.01 g / 10 min, it becomes difficult to mold the obtained polyolefin-based resin composition.

The flexural modulus of the polypropylene resin is measured according to JIS K 7203, and
000 kgf / cm ² or more, preferably 12000 to ²
0000 kgf / cm ² , more preferably 12,000
0 to 16,000 kgf / cm ² . If the flexural modulus is less than 12000 kgf / cm ² , the resin molded product obtained from the polyolefin-based resin composition cannot achieve the rigidity of wood. Also, 20000k
If it exceeds gf / cm ² , it becomes hard and the impact resistance decreases. The polypropylene resin giving the bending elastic modulus is
An ethylene-propylene block copolymer having an ethylene content of 1 to 7% by weight can be used.

The average particle size of the wood flour is 200 μm or less, preferably 10 to 200 μm, more preferably 2 μm.
0 to 150 μm. When the average particle diameter exceeds 200 μm, the impact resistance of the obtained resin molded product decreases, and
When it is less than μm, when extruding the polyolefin resin composition, a very high load is applied to the extruder,
Molding becomes difficult.

The wood flour is added in an amount of 20 to 200 parts by weight, preferably 50 to 150 parts by weight, based on 100 parts by weight of the polypropylene resin. If the amount of the wood flour is less than 20 parts by weight, the woodiness of the obtained resin molded product is reduced, and if it exceeds 200 parts by weight, the moldability of the polypropylene-based resin composition is deteriorated and the resulting resin molding There is a possibility that the impact resistance of the body is reduced and the body cannot be put to practical use.

The means for obtaining the wood flour is not particularly limited, and may be pulverized by a usual pulverizing method.
If necessary, it may be mixed with a heat stabilizer, a resin dispersant, or a wood acid quencher such as a metal stearate before use. Further, it is preferable to use a sufficiently dried wood flour. It is preferable to use one dried to a water content of less than 1% by weight. This water content is measured by a Karl Fischer method coulometric titration water content meter CA-06 manufactured by Mitsubishi Chemical Corporation. For example, when the wood flour crushed by the usual crushing method was dried in an oven at 100 ° C. for 2 hours, the water content was 0.2% by weight.

The above-mentioned inorganic filler mainly improves the extrudability of the above-mentioned polyolefin-based resin composition, in particular, the slipperiness with the mold surface, increases the rigidity of the obtained resin molded product, and provides good It is added in order to further enhance the feeling of wood, the type is not particularly limited,
Any inorganic filler that is commonly used for polypropylene resins can be used. Examples of these inorganic fillers include calcium carbonate, fly ash, dehydrated sludge, natural silica, synthetic silica, kaolin, clay, titanium oxide, barium sulfate, zinc oxide, aluminum hydroxide, alumina, magnesium hydroxide, talc,
Mica, glass flakes, hydrotalcite, magnesium silicate, calcined talc, wollastonite, potassium titanate, moss heidi, magnesium sulfate, sepiolite, zonolite, aluminum borate, silica balloon, glass balloon, copper, iron, iron oxide, carbon Examples include black, sendust, alnico magnets, magnetic powders such as various ferrites, and cement. These may be used alone or in combination of two or more.

The inorganic filler may be a coupling agent of silane type, titanate type, aluminate type, zirconium type or the like, a surfactant of phosphoric acid type, fatty acid type or the like, a surface treatment agent of oil or fat, wax or the like. May be applied.

The amount of the inorganic filler is 10 to 100 parts by weight, preferably 20 to 80 parts by weight, based on 100 parts by weight of the polypropylene resin. If the amount of the inorganic filler is less than 10 parts by weight, the moldability of the polyolefin-based resin composition is poor, and the woody feel of the obtained resin molded product does not sufficiently appear. If it exceeds the part, the Izod impact value decreases.

The above-mentioned polyolefin resin composition may contain, if necessary, an antioxidant, a stabilizer, a lubricant, a foaming agent, an antifogging agent,
Additives such as an antistatic agent, a flame retardant, and a coloring agent can be blended. Examples of the antioxidant and stabilizer include commercially available phenolic antioxidants, phosphorus antioxidants, amine antioxidants, and sulfur antioxidants. These may be used alone or in combination.

Examples of the lubricant include hydrocarbon waxes such as polyethylene wax, fatty acid and higher alcohol waxes such as stearic acid, stearyl alcohol and 12 hydroxystearic acid, stearic acid amide, oleic acid amide, erucic acid amide, methylene Amide waxes such as bisstearic acid amide, ethylenebisstearic acid amide, ethylenebisoleic acid amide, butyl stearate, monoglyceride stearate, pentaerythritol tetrastearate, hardened castor oil, ester waxes such as stearyl stearate, and calcium stearate And metal soaps such as zinc stearate, barium stearate, magnesium stearate and lead stearate. These may be used alone or in combination.

[0014] The above-mentioned foaming agent can further enhance the woodiness of the obtained resin molded product when the polyolefin resin composition is molded by an extruder. These foaming agents are not particularly limited, but include, for example, azodicarbonamide, sodium hydrogen carbonate, sodium carbonate,
Benzenesulfonyl hydrazide, dinitrosopentamethylenetetramine, toluenesulfonyl hydrazide, 4,
4-oxybis (benzenesulfonylhydrazide) and the like. These may be used alone or in combination.

[0015] The method for preparing the polyolefin resin composition of the present invention is not particularly limited. Examples thereof include a single screw extruder, a twin screw extruder, a Banbury mixer, a kneading roll, a Brabender, a plastograph, and a kneader. In such polyethylene-based resin using a device such as
A method of mixing and dispersing the above-mentioned inorganic filler can be used.

[0016] Izod impact value of the resin molded article of the present invention, 2kgf · cm / cm ² or more at 23 ° C., preferably from 2.0~20kgf · cm / cm ^2. If the Izod impact value is less than 2.0 kgf · cm / cm ² , the nailing property required as a substitute for wood decreases, and
If it exceeds 0 kgf · cm / cm ² , the feeling of rigidity decreases,
The wood texture cannot be obtained sufficiently.

Since the nailing property is a function governed by the tendency of the crack to spread to the scratch, it is considered that the method of spreading the scratch in the evaluation of the Izod impact is mechanically the same. Is 2.0kgf · cm /
It was confirmed that there was no problem in nailing properties when the density was not less than cm ² .

(Function) Since the above-mentioned polyolefin-based resin composition is constituted as described above, despite its high filling with wood powder, the slipping property with the molding die surface in extrusion molding is low. It is possible to mold a resin molded product having a good surface and a high woody feeling with a beautiful surface.

The resin molded article of the present invention has a beautiful surface, a high woody feel and an Izod impact value of 2 kgf · cm / cm ² or more at 23 ° C., and has good nailing properties like wood. Therefore, it can be used for a wide range of uses as a building material for houses.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described specifically with reference to examples, but the present invention is not limited to these examples. (Examples 1-4, Comparative Examples 1-2) Polyolefin-based resin compositions obtained by mixing a polypropylene-based resin, wood flour and an inorganic filler with the types and amounts shown in Table 1 were prepared by Sekisui Koki Seisakusho Co., Ltd. Was extruded using an extruder (PCM30) manufactured by Ikegai Co., Ltd. equipped with a T die (die width: 160 mm) to produce resin molded bodies having thicknesses of 3 mm and 6 mm.

[0021]

[Table 1]

The following polypropylene resin, wood powder and inorganic filler were used. 1. Polypropylene resin Polypropylene resin: Tokuyama Corporation, grade name “MS640”, MFR = 6.5 g / 10 min, flexural modulus 14500 kgf / cm ² Polypropylene resin: Chisso Corporation, grade name “K
5016 ", MFR = 6.0 g / 10 min, flexural modulus 21,000 kgf / cm ² Polypropylene resin: manufactured by Tokuyama Corporation, grade name" ME451 ", MFR = 17 g / 10 min, flexural modulus 9000 kgf / cm ²

2. 2. Wood flour: manufactured by Casino, trade name "Cellulosin 100", 100 mesh wood flour Inorganic filler: Shiraishi Co., Ltd., trade name "Ryton A", surface fatty acid-treated calcium carbonate, average particle size 1.9 μm Inorganic filler: Nippon Electric Glass Co., Ltd., trade name "ECO3T"
-488H / P ", glass fiber

In order to evaluate the performance of the resin molded articles of the examples and comparative examples, tests for flexural modulus, Izod impact strength, nailing property and woody feeling were performed. The results are shown in Table 2.

(Preparation of Test Specimen) For the measurement of the flexural modulus and the Izod impact test, the resin molded article composed of the extruded sheet was further pressed at 180 ° C. and 100 kgf / cm ² for 3 minutes to obtain a test specimen. Created.

(Test Method) The flexural modulus was measured according to JIS K7.
203, using a 6 mm thick test specimen.
Izod impact test is based on JIS K7110,
A 3 mm thick No. 2 notch test piece was used.

The nailing performance was determined by cutting a resin molded product molded by the above press into a 6 mm square die, driving a nail having a diameter of 2.5 mm into the center with a hammer, and punching out the material without cracks. 、: Cracks were evaluated as ×.

[0028]

[Table 2]

[0029]

The resin molded article of the present invention has a beautiful surface,
Since it has a high woody feel and good nailing properties like wood, it can be used for a wide range of applications as a building material for houses.

Continued on the front page (51) Int.Cl. ⁶ Identification code FI C08K 3:26 7:14)

Claims (1)

[Claims] (A) 100 parts by weight of a polypropylene resin having a melt flow rate (MFR) at 230 ° C. of 0.01 to 40 g / 10 min and a flexural modulus of 12000 kgf / cm ² or more; b) 20 to 200 parts by weight of wood flour having an average particle size of 200 μm or less;
(C) A resin molding having a woody feel, formed from a polyolefin-based resin composition comprising 10 to 100 parts by weight of an inorganic filler and having an Izod impact value of 2 kgf · cm / cm ² or more at 23 ° C. body.