JP2000240231A - Grain patterned rain gutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a grain-patterned rain gutter having wood touch obtained by mixing wooden powder to a styrene resin and a wooden pattern obtained by mixing colored pellet, while suppressing the heat deformation, improving shock resistance by the rubber components, and providing weatherability by coating the surface with transparent weather-proof resin. SOLUTION: Wooden based resin mixture mixing a wooden resin component formed by mixing not less than 5 pts.wt. and not more than 100 pts.wt. wooden powder with 100 pts.wt. styrene-based resin containing not less than 5 wt.% and not more than 40 wt.% rubber component with colored pellets composed of thermoplastic resin containing colorant is molded into a rain gutter. A coating layer not less than 20 μm and not more than 200 μm composed of transparent weather-proof resin containing 0.5 wt.% or more ultraviolet absorbing agent all beam permeability 70% or more, and clouding value 1-30% is provided on its surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grain gutter for forming a grain pattern, and more particularly, to a gutter using a wood-based resin mixture obtained by mixing a wood-based resin obtained by filling a wood resin into a styrene-based resin with colored pellets. In addition, the present invention relates to a wood grain pattern forming rain gutter having a wood grain pattern and a woody feel, and also having excellent impact resistance and weather resistance.

[0002]

2. Description of the Related Art
In general, most rain gutters made of synthetic resin have a single color in appearance. For this reason, in wooden houses,
Eaves gutters and hard gutters were conspicuous, reducing the design of the entire building. In addition, since it is molded with a rigid PVC (polyvinyl chloride) resin, it is softened at about 60 ° C., and not only deforms at a higher temperature but also has a linear expansion coefficient of 6.0 to 8.0. Since it is about × 10 ⁻⁵ (1 / ° C.), there is a problem that the rain gutter is deformed by expansion and contraction due to heat.

On the other hand, in recent years, molded articles in which wood powder is blended with a thermoplastic resin have been used, but these have had a problem that sufficient impact resistance cannot be obtained.

Accordingly, an object of the present invention is to provide a grain-patterned rain gutter having a wood grain pattern and a woody texture, and also having excellent impact resistance and weather resistance and particularly suitable as a rain gutter in a wooden house.

[0005]

In order to achieve the above object, a grain gutter for forming a grain pattern according to the present invention comprises a styrene resin
A wood-based resin mixture obtained by mixing a wood-based resin composition in which 5 parts by weight or more and 100 parts by weight or less of wood flour is blended with 0 part by weight and a colored pellet made of a thermoplastic resin containing a colorant is molded. This makes it possible to impart a woody texture and a grain pattern to the appearance of the synthetic wood rain gutter, and reduce the coefficient of linear expansion to suppress deformation due to heat. it can.

[0006] Further, the grain pattern forming gutter of the present invention is characterized in that the styrene-based resin contains a rubber component in an amount of 5% by weight or more and 40% by weight or less, When molded into a gutter, a transparent weatherable resin having a surface containing at least 0.5% by weight of an ultraviolet absorber, a total light transmittance of 70% or more, and a haze value of 1 to 30% is formed. It is characterized in that a coating layer of 20 μm or more and 200 μm or less made of a conductive resin is provided.

The styrenic resin used as the base material of the woody resin composition of the present invention is not particularly limited in its kind, and can be selected according to the performance such as heat resistance. Specifically, ABS (acrylonitrile-butadiene rubber-styrene copolymer) resin, AES (acrylonitrile-ethylene propylene rubber-styrene copolymer) resin,
AAS (acrylonitrile-acrylic rubber-styrene copolymer) resin and the like, and a mixture thereof can be used. Further, a mixture of a styrene-based resin with a PVC resin, a PC (polycarbonate) resin, a polyester resin, a polyamide resin, a PPE (polyphenylene ether) resin (including a styrene-modified PPE resin), or the like can also be used.

The above-mentioned styrenic resin is generally sufficient, but preferably contains a rubber component in the range of 5% by weight to 40% by weight, and more preferably 10% by weight to 3% by weight.
Those containing in an amount of 0% by weight or less are preferable. By including the rubber component in such a range, the surface appearance, impact resistance, and heat resistance can be improved. Further, when a styrene resin modified with α-methylstyrene, phenylmaleimide, or the like is used, heat resistance can be improved.

There is no particular limitation on the wood powder to be filled in the styrene resin, and wood powder such as pine, toga, cherry, cedar, cypress, beech, lauan, and fir can be used. As the shape of the wood flour, a pulverized product is preferable, and a powder having a size of 100 mesh or less is preferable in terms of fineness of the woody texture.

The filling amount of the wood powder into the styrene resin is as follows:
5 parts by weight or more per 100 parts by weight of styrene resin
The amount is suitably not more than 00 parts by weight, and preferably not less than 10 parts by weight and not more than 50 parts by weight in consideration of a feeling of woodiness and moldability. If the filling amount of the wood powder is less than 5 parts by weight, a sufficient woody feeling cannot be obtained. If the filling amount exceeds 100 parts by weight, molding becomes difficult and the impact resistance of the molded product decreases.

Further, additives such as a lubricant can be added to improve the moldability of the wood-based resin composition.
At that time, in order not to lower the heat-sealing strength with a transparent weatherable resin described later, it is preferable to use a styrene-modified polyethylene wax having a molecular weight of 1,000 to 5,000 which is compatible with the styrene resin.

The amount of the styrene-modified polyethylene wax to be added is preferably from 0.1 to 30 parts by weight based on 100 parts by weight of the styrene-based resin. The range of not less than 10 parts by weight and not more than 10 parts by weight is suitable. If the amount is less than 0.1 part by weight, the smoothness of the appearance may be impaired. If the amount exceeds 30 parts by weight, the styrene-modified polyethylene wax bleeds out, and the heat-sealing molding with the transparent weather-resistant resin becomes impossible. become unable.

Although the composition of the thermoplastic resin used for the colored pellets is not particularly limited, it is preferable to use any one of a styrene resin, a polycarbonate resin and an acrylic resin. In addition, each resin can be mixed at an arbitrary ratio, and in addition to the resin, if necessary, a lubricant, a filler, a weathering agent, a flame retardant, a reinforcing agent, and the like may be added to the molded product appearance, molding processability, molded product. It can be added arbitrarily as long as the properties are not impaired.

In addition to the above, if necessary, fillers such as calcium carbonate, talc, mica and glass beads, coloring agents such as dyes and pigments, weathering agents such as ultraviolet absorbers and light stabilizers, flame retardants, A reinforcing agent such as carbon fiber or glass fiber can be arbitrarily added within a range that does not impair the appearance of the molded product, the moldability, and the physical properties of the molded product.

Although the composition of the thermoplastic resin used for the coloring material is not particularly limited, it is preferable to use any one of a styrene resin, a polycarbonate resin, and an acrylic resin. In addition, each resin can be mixed at an arbitrary ratio, and in addition to the resin, if necessary, a lubricant, a filler, a weathering agent, a flame retardant, a reinforcing agent, and the like may be added to the molded product appearance, molding processability, molded product. It can be added arbitrarily as long as the properties are not impaired.

As the styrene resin used for the colored pellets, for example, commercially available resins such as SAN (styrene-acrylonitrile copolymer) resin, ABS resin, AAS resin and AES resin can be used. SAN resins modified with phenylmaleimide or the like are preferred.

Further, as the polycarbonate resin,
Those using bisphenol A are preferred because of their excellent mechanical properties and transparency, and acrylic resins such as PM
MA (polymethyl methacrylate) resin and the like are preferable in terms of moldability.

The above thermoplastic resin has a glass transition temperature (Tg) higher than the glass transition temperature of the styrene resin as a base material of the woody resin composition by 20 ° C. or more, and at a temperature of 190 ° C. under shearing. The melt viscosity ratio at a speed of 1 × 10 ² sec ⁻¹ was 1 /
It is preferable to use one having 2 or more and 50/1 or less. If the temperature difference of the glass transition temperature is smaller than 20 ° C., the styrene resin serving as the base material of the woody resin composition and the thermoplastic resin of the colored pellets may be mixed to make it impossible to form a pattern. When the melt viscosity ratio is less than 1/2, the colored pellets are uniformly dispersed and no pattern is formed,
If the ratio is more than 50/1, the dispersion of the colored pellets may be poor and may not clearly appear as a grain pattern.

Further, the mixing amount of the colored pellets is set to 0.1.
If the amount is less than 5 parts by weight, the color of the styrene-based resin of the base material is taken in, and the grain pattern is not clear. If the amount exceeds 10 parts by weight, the color of the colored pellets appears too much and The pattern may become unclear. In addition, the coloring agent mixed with the coloring pellets is not particularly limited, and various pigments and dyes can be used arbitrarily.

On the other hand, the transparent weather-resistant resin which is a main component of the coating layer may be any resin that can be thermally fused with the styrene resin as the base material. Examples thereof include acrylic resin, ABS resin, and AE resin.
S resin, AAS resin, PVC resin, PC resin, polyester resin, polyamide resin, PPE resin (including styrene-modified PPE resin), and the like, and a mixture of two or more of these can be suitably used.

Further, the transparent weatherable resin contains an ultraviolet absorber in an amount of 0.5% by weight or more, and has a total light transmittance of 70% or more and a haze of 1 to 30%. Is optimal. When the total light transmittance is less than 70% or the haze value exceeds 30%, the woody feeling of the base material does not sufficiently appear on the surface. On the other hand, if the haze value is less than 1%, the surface shines and the woodiness of the substrate is impaired.

The thickness of the transparent weather-resistant resin varies depending on the ultraviolet absorbing ability, but is suitably in the range of 20 to 200 μm, particularly 50 to 12 μm.
A range of 0 microns or less is preferred. If the thickness is less than 20 microns, the ultraviolet absorbing ability is insufficient. For example, in a weather resistance test using a sunshine weather meter at a black panel temperature of 63 ° C, discoloration and fading of the base material occur in 500 hours. Conversely, even if the thickness exceeds 200 microns, the effect of improving weather resistance is hardly observed.

The ultraviolet absorber is not particularly limited as long as the total light transmittance and haze of the transparent weatherable resin can be set within the above ranges, and can be appropriately selected according to the type of the resin as the main component. For example, salicylates, benzophenones, benzotriazoles, cyanoacrylates, nickel chelates and the like can be used, and hindered amines (HALS) can be used in combination. In particular,
When the transparent weatherable resin is a resin in which a matting agent is filled in an acrylic resin, it is preferable to use a benzotriazole-based ultraviolet absorber.

The amount of the ultraviolet absorber to be filled is not particularly limited as long as the total light transmittance and the haze can be set within the above ranges. In the above-mentioned test using the sunshine weather meter, the amount is set to 500 hours. In order to prevent discoloration of the material, 0.5% by weight or more is required.

The matting agent is added as necessary to make the surface gloss appropriate, and the type and amount of the matting agent can be set so that the above-mentioned total light transmittance and haze value are within the above-mentioned ranges. There is no particular limitation as long as it is within the range, and usually, it may be determined according to the material of the transparent weatherable resin and its compatibility. Generally, silica particles having a particle diameter of 0.05 to 5 microns are used, and a coupling treatment can be performed depending on compatibility with the resin.

The method of coating the rain gutter of the molded product with the transparent weather-resistant resin is basically performed by heat fusion. Therefore, as a coating method, such as co-extrusion molding and two-color injection molding,
The method can be performed by simultaneously forming the gutter and coating the transparent weather-resistant resin, or by forming a coating layer on the surface of the previously formed gutter by thermal lamination molding. Although it is possible to obtain sufficient weather resistance even if the rain gutter is covered only with a portion exposed to light or rain, a portion to be coated with the transparent weather resistant resin can be appropriately selected depending on a coating method (molding method). There is no problem at all even if the entire gutter is covered.

[0027]

EXAMPLES Examples of the present invention will be described below, but the scope of the present invention is not limited by the following examples.

Example 1 25 parts by weight of wood flour (trade name: Cellulosin # 100, manufactured by Casino Co., Ltd.) and styrene-modified polyethylene wax (Mitsui Corporation) were added to 100 parts by weight of an ABS resin containing 5% by weight of butadiene rubber. Chemical product, high wax 1160
H) The composition containing 15 parts by weight was pelletized by a bidirectional twin screw extruder to obtain a base pellet (wood-based resin composition) composed of a styrene-based resin.

On the other hand, the glass transition temperature is 55
A composition obtained by blending 50 parts by weight of a coloring pigment with respect to 100 parts by weight of a phenylmaleimide-modified SAN resin whose temperature is higher by 10 ° C. is pelletized using a co-axial twin-screw extruder, and has a melt viscosity ratio with the base material of 10/1. And

3 parts by weight of the colored pellets are mixed with 100 parts by weight of the base pellets, and the mixed pellets are formed into a rain gutter shape by a bidirectional biaxial molding machine, and at the same time, an acrylic resin coating of 80 μm is formed by a co-extruder. A layer was formed, and a two-layer molded product of a rain gutter having a grain pattern was obtained. The acrylic resin coating layer is formed by adding an acrylic resin to the acrylic resin.
(3,5-di-t-butyl-2-hydroxyphenyl)
-5-chlorobenzotriazole in an amount of 2% by weight and silica as a matting agent in an amount of 2.5 parts by weight (based on 100 parts by weight of an acrylic resin, the same applies hereinafter), and its total light transmittance Is 80% and the haze is 5%.

Example 2 A rain gutter (two-layer molded product) was formed in the same manner as in Example 1 except that the amount of wood powder in the wood-based resin composition was changed to 5 parts by weight.

Example 3 A rain gutter was formed in the same manner as in Example 1 except that the amount of wood powder in the wood-based resin composition was changed to 100 parts by weight.

Example 4 A rain gutter was formed in the same manner as in Example 1 except that the butadiene rubber content in the wood-based resin composition was changed to 5% by weight.

Example 5 The butadiene rubber content in the woody resin composition was 40.
A rain gutter was formed in the same manner as in Example 1 except that the weight% was used.

Example 6 A rain gutter was formed in the same manner as in Example 1 except that the thickness of the acrylic resin coating layer on the surface was changed to 20 μm.

Example 7 A rain gutter was formed in the same manner as in Example 1 except that the thickness of the acrylic resin coating layer on the surface was set to 200 μm.

Example 8 When the content of silica in the acrylic resin coating layer on the surface was 5
0 parts by weight, the total light transmittance is 70%, the haze is 30
%, A gutter was formed in the same manner as in Example 1.

Example 9 The content of silica in the acrylic resin coating layer on the surface was 1
A rain gutter was formed in the same manner as in Example 1 except that the parts were parts by weight, the total light transmittance was 95%, and the haze value was 1%.

Comparative Example 1 A rain gutter was formed in the same manner as in Example 1 except that the amount of wood powder in the wood-based resin composition was changed to 0 parts by weight.

Comparative Example 2 A rain gutter was formed in the same manner as in Example 1 except that the amount of wood powder in the wood-based resin composition was changed to 125 parts by weight.

Comparative Example 3 A gutter was formed in the same manner as in Example 1 except that the butadiene rubber content in the wood-based resin composition was changed to 0% by weight.

Comparative Example 4 The butadiene rubber content in the woody resin composition was 50
A rain gutter was formed in the same manner as in Example 1 except that the weight% was used.

Comparative Example 5 A rain gutter was formed in the same manner as in Example 1 except that the thickness of the acrylic resin coating layer on the surface was changed to 15 μm.

Comparative Example 6 A gutter was formed in the same manner as in Example 1 except that the thickness of the acrylic resin coating layer on the surface was changed to 220 μm.

Comparative Example 7 2- (3,5-di-) in the acrylic resin coating layer on the surface
A gutter was formed in the same manner as in Example 1 except that the content of (t-butyl-2-hydroxyphenyl) -5-chlorobenzotriazole was 0.3% by weight.

Comparative Example 8 The content of silica in the acrylic resin coating layer on the surface was 5
5 parts by weight, having a total light transmittance of 65% and a haze of 35
%, A gutter was formed in the same manner as in Example 1.

Comparative Example 9 Example 1 was repeated except that the content of silica in the acrylic resin coating layer on the surface was 0.5 part by weight, the total light transmittance was 95%, and the haze value was 0.7%. A gutter was formed in the same manner as described above.

Comparative Example 10 A rain gutter was formed in the same manner as in Example 1 except that the mixing amount of the colored pellets in the mixed pellets was changed to 0 parts by weight.

With respect to the rain gutters formed in each of the examples and comparative examples, the appearance (woodiness) immediately after the production and the appearance after 500 hours of a weather resistance test using a sunshine weather meter with a black panel temperature of 63 ° C. (Weather resistance discoloration) was visually evaluated. Also,
According to JIS K 7111, the Charpy impact value (kg · cm / cm ² ) at 23 ° C. was measured to evaluate the impact resistance. Table 1 shows the evaluation results.

The evaluation criteria in Table 1 were as follows.

Woody feeling ：: Good woody feeling ：: Woody feeling ×: No woody feeling Weathering discoloration and discoloration ：: Discoloration and discoloration not observed Δ: Some discoloration and discoloration are observed Impact value: kg · cm / cm ² ) ○: 10 or more △: 3 to 9 ×: 2 or less

[0052]

[Table 1]

[0053]

As described above, according to the grain gutter of the present invention, it is possible to obtain a gutter having a woody texture and a grain pattern and having excellent impact resistance. Furthermore, by forming a two-layer molded body by coating the transparent weather resistant resin, it is possible to obtain a rain gutter excellent in weather resistance while maintaining a woody texture and a grain pattern, particularly when used in a wooden house. In addition, the original requirements of the gutter can be satisfied without deteriorating the design of the entire building.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) B29L 31:10

Claims (4)

[Claims] 1. A wood-based resin composition in which wood flour is mixed in an amount of 5 to 100 parts by weight with respect to 100 parts by weight of a styrene-based resin, and colored pellets made of a thermoplastic resin containing a colorant are mixed. A woodgrain-forming rain gutter formed by molding a wood-based resin mixture. 2. The grain gutter according to claim 1, wherein the styrene resin contains a rubber component in an amount of 5% by weight or more and 40% by weight or less. 3. When the wood-based resin mixture according to claim 1 or 2 is formed into a rain gutter, a coating layer made of a transparent weather-resistant resin and having a thickness of 20 μm or more and 200 μm or less is provided. Wood pattern forming rain gutter. 4. The transparent weatherable resin contains an ultraviolet absorber in an amount of 0.5% by weight or more, and has a total light transmittance of 70% or more,
The grain pattern forming gutter according to claim 3, wherein the haze value is 1 to 30%.