JP2000072954A - Woody resin composition and molding made therefrom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a composition which can give a molding made proof against weathering, especially, bleeding occurring upon exposure to water or warm water, necessitating no surface treatment and having an excellent woody appearance by mixing an olefin resin with a specified amount of a cashew-nutshell-oil- modified phenolic resin and to obtain a molding made therefrom. SOLUTION: This composition is prepared by mixing 100 pts.wt. olefin resin with 1-100 pts.wt. modified phenolic resin. The olefin resin used is exemplified by a polyethylene resin, a polypropylene resin, or a polystyrene resin. The cashew-nutshell-oil-modified phenolic resin used is exemplified by a novolac cashew-nutshell-oil-modified phenolic resin prepared by subjecting to an acid treatment cardanol obtained by heat-treating a dark brown liquid contained in the shells of nuts of a cashew (Anacardium occidentale, a tree of the family Anacardiaceae) and formaldehyde or a resol cashew-nutshell-oil-modified phenolic resin prepared by using an alkali as the catalyst.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a woody resin composition, and more particularly, to a resin composition having an excellent woody feel and a woody resin molded product obtained by melt-molding the resin composition.

[0002]

2. Description of the Related Art In recent years, wood-based materials, such as window frames, door frames, floors, ceilings, and stair railings, have been increasingly used as interior materials for houses. In addition, there is an increasing demand for a warmer house by attaching a wooden material to the exterior material. When wood itself is used, it is a natural product and thus lacks color uniformity, and has problems such as weather resistance to water, light, etc., combustibility, and durability. Therefore, many attempts have been made to obtain a wood substitute molded product having a woody feel by mixing wood powder or the like with a hard synthetic resin as a substitute for wood.

[0003] However, these hard synthetic resins having a woody feel have a defect in weather resistance because wood powder is used to some extent. In particular, as interior materials,
When used as a water supply material for kitchens, bathrooms, etc., cellulose contained in wood flour will cause a bleeding phenomenon due to the effects of water or hot water, and will emerge on the surface of the molded product,
There is a problem that the woody texture of the molded product and further the grain pattern disappear completely.

[0004] In order to solve this problem, there is an example in which a molded product is coated with a surface using a urethane resin, an acrylic resin, a melamine resin, a polyester resin or the like as a paint. However, in these methods, the wooden texture of the surface of the molded article is impaired, and in order to obtain a wooden texture, an attempt has been made to include a wood powder in the coating agent at the time of surface coating to give a wooden texture. There is no expectation of wood texture. Further, as long as wood flour is used, the bleeding phenomenon that occurs with water or hot water is not substantially improved. Furthermore, in these methods, in addition to the forming process, a coating process of a coating agent, a drying process after application, etc. are added as a surface treatment process, and the increase and complexity of the process are inevitable, and in terms of economy, The problem remains.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the conventional method, suppresses the bleeding phenomenon that occurs with respect to the weather resistance, particularly with respect to water or hot water, and requires a surface treatment step. It is an object of the present invention to provide a woody resin composition and a molded article having excellent woody feel.

[0006]

Means for Solving the Problems The present inventors have made intensive studies to solve such problems with the aim of improving the weather resistance without impairing the feeling of wood, particularly the bleeding phenomenon caused by the influence of water or hot water. As a result, a cashew nut shell oil-modified phenolic resin is used in place of wood powder conventionally added to give a synthetic resin a woody feeling, and an olefin resin and acrylonitrile-butadiene-styrene are used. By adding this cashew nut shell modified phenolic resin to the copolymer resin, it was possible to suppress the bleeding phenomenon that occurs with respect to the weather resistance, particularly with respect to water and warm water, and also used wood flour. It is clear that the system does not require surface coating and surface treatment to prevent bleeding. Thus, the present invention has been attained.

That is, the present invention relates to a woody resin composition obtained by mixing 1 to 100 parts by weight of a cashew nut shell oil-modified phenolic resin with 100 parts by weight of an olefin resin. It is a woody resin composition obtained by mixing 1 to 100 parts by weight of a phenolic resin with 100 parts by weight of an acrylonitrile-butadiene-styrene copolymer resin (hereinafter referred to as ABS resin). Further, the present invention is a wood-like resin molded product obtained by melt-molding the resin composition and having an excellent woody feel.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The cashew nut shell oil-modified phenolic resin in the present invention is a black-brown liquid (curdule, anacardo) contained in the shell of the cashew tree, a lacquer anacardium plant native to South America, India and Africa. Novolak-type cashew nut shell oil-modified phenolic resin obtained by subjecting cardanol obtained by heat treatment to formanol and resol-type cashew nut shell oil-modified phenolic resin treated with alkali as a catalyst It is a resin or an alkylphenol-based cured resin having a crosslinked structure subjected to another treatment. These are easily available on the market, for example, Centlight Cashew Dust FF-1040 called Cashew Dust Resin manufactured by Tohoku Kako Co., Ltd.
Examples thereof include FF-1045, FF-1148, and FF-2090, which are classified according to particle size distribution, color tone, flexibility, heat resistance, and the like, and can be used properly according to applications. Among these, FF-104 having particularly fine particle diameters
5, the use of FF-1140 or the like is preferable because a good wooden feeling can be imparted to the obtained molded product.

A woody resin composition can be obtained by mixing a cashew nut shell oil-modified phenolic resin with an olefinic resin or an ABS resin, which gives the appearance and feel of the woody woody feel. The number of parts to be added depends on the olefin resin or A
It is in the range of 1 to 100 parts by weight, preferably 3 to 80 parts by weight, most preferably 5 to 100 parts by weight based on 100 parts by weight of the BS resin.
５０50 parts by weight. When the number of the added parts is less than 1 part by weight, the woody feeling that the surface is rough due to touch is small, and
If the amount is more than 0 parts by weight, the moldability will be reduced.

The olefin resin in the present invention includes polyethylene resin, polypropylene resin, polystyrene resin and the like. Here, the polyethylene resin is an ethylene homopolymer or an ethylene copolymer with a monomer such as an α-olefin, and the polymerization method is any of a conventionally known high-pressure method, medium-pressure method, low-pressure method and the like. Manufactured ones can also be used and are readily available on the market. The polypropylene resin is a propylene homopolymer or a propylene copolymer with a monomer such as an α-olefin, and the polymerization method is a conventionally known bulk polymerization method, gas phase polymerization method, solvent polymerization method or the like. Those manufactured by either method can be used and can be easily obtained on the market.
Further, a polystyrene-based resin refers to a styrene-based homopolymer or α-olefin, methyl methacrylate (MM
A high-impact polystyrene resin which is a styrene-based copolymer with a monomer such as A) and is obtained by polymerizing styrene into a rubber component. Further, as the polymerization method of these polystyrene resins, those produced by any of the conventionally known bulk polymerization method, suspension polymerization method, emulsion polymerization method and the like can be used, and they can be easily obtained on the market.

The ABS resin in the present invention is a graft copolymer obtained by graft-polymerizing a monomer containing aromatic vinyl and vinyl cyanide onto a rubber component made from a monomer containing butadiene. And a resin containing a copolymer produced from other monomers copolymerizable with aromatic vinyl and vinyl cyanide. Here, the rubber component is produced by a conventionally known solution polymerization method, bulk polymerization method, emulsion polymerization method or the like. Further, as the rubber and the graft polymer or a copolymer of the rubber, those produced by any of conventionally known methods such as a solution polymerization method, a bulk polymerization method, and an emulsion polymerization method can be used. Easily available at

The above-mentioned resin composition used in the present invention contains stabilizers, lubricants, fillers, antioxidants, ultraviolet absorbers, nucleating agents, impact modifiers, foaming agents, processing aids generally used as additives. Agents, pigments, elastomers and the like can be used as needed.

The stabilizer used herein may be any known one, and examples thereof include inorganic acid salts, metal soaps, organometallic compounds, and organic compounds. As a lubricant,
Any of a hydrocarbon type, a fatty acid type, an ester type, a metal soap type, a fatty alcohol type, a polyhydric alcohol type and the like, or a mixed type thereof can be used. The processing aid may be any of known ones, for example, polymethyl methacrylate. The pigment may be any of known pigments, for example, titanium oxide, red iron oxide, graphite, carbon black and the like.

The filler may be any of known fillers, for example, calcium carbonate, clay, hydrous silicic acid, anhydrous silicic acid, calcium silicate, aluminum silicate asbestos powder, antimony oxide, talc, aluminum trihydrate, boric acid hydrate Zinc, magnesia, baking soda, nitric acid potassium, calcium hydroxide, mica, synthetic fluorine mica and the like.

The antioxidant may be any of known ones, for example, alkylphenol type, alkylene bisphenol type, alkylphenol thioether type, β, β′-thiopropionate type, organic phosphite type, Aromatic amine type, phenol / nickel complex and the like can be mentioned.

The ultraviolet absorber may be any of known ones, for example, salicylic acid ester type, benzotriazole type, hydroxybenzophenone type and the like. The blowing agent may be any of known ones, for example, p, p′-oxy-bis (benzenesulfonylhydrazide) (OBSH), azodicarbonamide (AD
CA) and sodium hydrogen carbonate (NaHCO3). These commonly used additives are readily available on the market and can be used as needed.

The method for obtaining the resin composition of the present invention includes:
Add cashew nut shell oil-modified phenolic resin, stabilizer, lubricant, and other additives as needed to the above-mentioned olefin resin or ABS resin, and stir and mix them with a Henschel mixer, Banbury mixer, ribbon blender, etc. And further obtained, for example, as pellets granulated by a kneader such as a conical twin-screw extruder, a parallel twin-screw extruder, a single-screw extruder, a kneader-type extruder, and a roll kneader. be able to.

Using the blended powder or pellet obtained above,
Extrusion molding, profile extrusion molding, injection molding, calendar molding,
By performing melt molding such as vacuum molding and blow molding, it is possible to easily obtain a woody resin molded product having an excellent woody feel.

[0019]

The present invention will be more specifically described below with reference to examples. This embodiment is merely an example, and the present invention is not limited to these embodiments.

The resin used in the present embodiment is a compound using a polyethylene resin, a polypropylene resin, a polystyrene resin and an ABS resin, and is a Labo Plastomill-conical twin screw extruder manufactured by Toyo Seiki Seisakusho Co., Ltd. Using a 2D-20C type, a slit die (W = 40 mm, H = 1 mm, L = 60 mm) is used as a die, and the cylinder temperature and the die temperature are set to arbitrary temperatures by respective resins, and the width is 40 mm. To obtain a flat molded product having a thickness of 1 mm. Using this molded product, the feeling of wood and the bleeding phenomenon were evaluated as follows.

Regarding the feeling of wood, the gloss of the molded product was measured and evaluated. The measurement was performed using a handy gloss meter gloss checker IG-320 manufactured by Horiba, Ltd. Here, it was determined that there was a woody feeling when the gloss value was 15 or less. In addition, the molded article was visually observed and palpated by 10 researchers other than the present researcher, and at that time, the molded article that was evaluated by 6 or more out of 10 persons was judged to have a woody feeling. did.

Regarding the bleeding phenomenon, a container containing water is put in a circulation hot air dryer DG (DFR) -100 manufactured by Futaba Kagaku Co., Ltd. and heated so that the water temperature becomes 50 ° C. Then, the molded article was immersed in the warm water for 24 hours, and changes in the surface state of the molded article before and after immersion were observed. The surface conditions were ranked as follows.印: no change. X: Bleeding phenomenon occurs (the surface of the molded product becomes white, and the original color on the surface of the molded product disappears).

The molecular weight of the resin is represented by a melt flow index (expressed by the weight of the resin extruded at a specific temperature and at a constant load for 10 minutes; hereinafter, referred to as MI), and the JIS corresponding to each resin is used. Was measured.

Example 1 As a polyethylene resin, MI (JIS-K6760) was used.
A test temperature of 190 ° C., a weight of 2.16 kgf) was added to 100 parts by weight of an ethylene homopolymer (HI-ZEX5000SR, manufactured by Mitsui Chemicals, Inc.) at 0.40 g / 10 minutes, and a cashew nut shell oil-modified phenolic resin ( Cent Light Cashew Dust FF-104, manufactured by Tohoku Kako Co., Ltd.
5) 80 parts by weight and 0.1 part by weight of Yoshinox BHT (manufactured by Yoshitomi Pharmaceutical Co., Ltd.) as a phenolic antioxidant were mixed with a Henschel mixer manufactured by Mitsui Miike Co., Ltd., and the resulting composition was subjected to GM. Engineering Co., Ltd. Caliber 50
The mixture was granulated with a single-mm extruder to obtain pellets.

The above pellets were used with a Labo Plastomill conical twin screw extruder 2D-20C manufactured by Toyo Seiki Seisaku-sho, Ltd., and a slit die (W = 40 mm, H
= 1 mm, L = 60 mm), the cylinder temperature is set to 200 ° C, the die temperature is set to 220 ° C, and the width is 40 m.
m, a flat molded product having a thickness of 1 mm was obtained. The gloss of the surface of the flat molded product and the number of researchers who felt the woodiness by visual inspection and palpation were evaluated for the bleeding phenomenon after immersion in 50 ° C. hot water. Table 1 shows the results.

Example 2 As a polypropylene resin, MI (JIS-K675) was used.
8, a propylene block copolymer having a test temperature of 230 ° C. and a weight of 2.16 kgf) of 0.35 g / 10 min (Grand Polypro BE, manufactured by Grand Polymer Co., Ltd.)
B, ethylene content 9%) 100 parts by weight of cashew nut shell oil modified phenolic resin (Centrifuge Cashew Dust FF-1045, manufactured by Tohoku Kako Co., Ltd.) and calcium stearate (Sakai Chemical Co., Ltd.) as a stabilizer 0.1 parts by weight of SC-PGM, manufactured by Nippon Ciba Geigy Co., Ltd., IRGAFOS-16
8) 0.1 part by weight of a hindered phenolic antioxidant (Irganox 101, manufactured by Nippon Ciba Geigy Co., Ltd.)
0) Pellets were obtained in the same manner as in Example 1 using 0.1 parts by weight, and the pellets were obtained and evaluated in the same manner as in Example 1 to obtain flat plate molded articles. Table 1 shows the results.

Example 3 Pellets were obtained in the same manner as in Example 2 except that the modified cashew nut shell oil-modified phenol resin was changed to 80 parts by weight. Table 1 shows the results.

Example 4 As a polystyrene resin, MI (JIS-K7210) was used.
A styrene homopolymer (TOPOLEX 555-57, manufactured by Nippon Polystyrene Co., Ltd.) having a test temperature of 200 ° C. and a weight of 5.00 kgf) of 2.60 g / 10 min.
100 parts by weight of cashew nut shell oil-modified phenolic resin (Central Light Cashew Dust F, manufactured by Tohoku Kako Co., Ltd.)
F-1045) 40 parts by weight and stearic acid (Lunac S-30, manufactured by Kao Corporation) 0.1 part by weight as a lubricant were used to obtain pellets in the same manner as in Example 1; A flat molded article was obtained and evaluated in the same manner as in the above. Table 1 shows the results.

Example 5 As an ABS resin, MI (test temperature 200 ° C., weight 5.00 kgf) according to JIS-K7210 was 0.90 g /
10 minute acrylonitrile-butadiene-styrene copolymer (manufactured by Mitsui Chemicals, Inc., Santac ST-55) 1
100 parts by weight of cashew nut shell oil-modified phenolic resin (Central Light Cashew Dust F, manufactured by Tohoku Kako Co., Ltd.)
F-1045) Pellets were obtained in the same manner as in Example 1 using 5 parts by weight, and the pellets were obtained and evaluated in the same manner as in Example 1. Table 1 shows the results.

Example 6 Pellets were obtained in the same manner as in Example 5 except that the cashew nut shell oil-modified phenol resin was changed to 40 parts by weight, and a flat molded product was evaluated. Table 1 shows the results.

Example 7 Pellets were obtained in the same manner as in Example 5 except that the modified cashew nut shell oil-modified phenol resin was changed to 80 parts by weight, and a flat molded product was evaluated. Table 1 shows the results.

[0032]

[Table 1] Comparative Example 1 Pellets were obtained in the same manner as in Example 1 except that the cashew nut shell oil modified phenol resin was changed to 0.5 part by weight, and a flat molded product was evaluated. Table 2 shows the results.

Comparative Example 2 Pellets were obtained in the same manner as in Example 2 except that the modified cashew nut shell oil-modified phenol resin was changed to 0.5 part by weight, and a flat molded product was evaluated. Table 2 shows the results.

Comparative Example 3 Pellets were obtained in the same manner as in Example 4 except that the modified cashew nut shell oil-modified phenol resin was changed to 0.5 part by weight, and a flat molded product was evaluated. Table 2 shows the results.

Comparative Example 4 The procedure of Example 5 was repeated except that the cashew nut shell oil-modified phenol resin was changed to 150 parts by weight, but no pellet was obtained. Table 2 shows the results.

[0036]

[Table 2]

[0037]

According to the present invention, a resin according to the target physical properties and intended use can be used as a substitute for a tree itself such as a member for a building material conventionally used especially in the vicinity of water or hot water in a kitchen or a bathtub. It is possible to provide a woody resin composition having excellent woody feel and a molded product thereof, and it is extremely advantageous in terms of industry and global environment.

Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat II (Reference) C08L 55/02 C08L 55/02 F term (Reference) 4J002 BB031 BB051 BB141 BB151 BC031 BC071 BN141 BN151 CC072 FD010 FD030 FD050 FD070 FD090 FD170 FD GL00 GL01

Claims (6)

[Claims] A woody resin composition comprising 1 to 100 parts by weight of a cashew nut shell oil-modified phenolic resin and 100 parts by weight of an olefin resin. 2. An amount of 1 to 100 parts by weight of a cashew nut shell oil-modified phenolic resin is added to acrylonitrile-butadiene-
A woody resin composition mixed with 100 parts by weight of a styrene copolymer resin (ABS resin). 3. A wood-like resin composition according to claim 1, wherein the olefin resin is a polyethylene resin. 4. A wood-like resin composition wherein the olefin resin according to claim 1 is a polypropylene resin. 5. A woody resin composition according to claim 1, wherein the olefin resin is a polystyrene resin. 6. A woody resin molded product obtained by melt-molding the resin composition according to claim 1 or 2.