JPH1158567A - Artificial timber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide artificial timber having excellent antibacterial properties without considering the hygiene by mixing an inorganic or organic antibacterial agent into at least a surface layer of a synthetic resin layer made of a foamable synthetic resin. SOLUTION: A synthetic resin layer 1 is made of a foamable synthetic resin. The resin is prepared by mixing the resin with a suitable foaming agent. The layer 1 is mixed not only an antibacterial agent except the foaming agent but also suitable wood powder, a flame retardant, a filler, pigment, a plasticizser, a stabilizer, a foaming assistant, an ultraviolet absorber and/or the like as needed. As the antibacterial agent to be mixed with the layer 1, an inorganic ion exchanger such as zeolite or the like, an inorganic antibacterial agent such as silver, copper, zinc or the like carried to a porous material, an organic antibacterial agent such as a suitable chloride or the like, or an inorganic and organic composite antibacterial agent by a holding compound or encapsulizing is used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a floor material for a terrace, a balcony, a restaurant, etc., a station square, a playground equipment or a promenade of a park, a wooden bridge hanging over a pond, spring water, a wooden path passed to a wetland in a natural park, and the like. The present invention relates to synthetic wood that replaces natural wood used for such purposes.

[0002]

2. Description of the Related Art Conventionally, in such synthetic woods, wood flour is appropriately blended in a synthetic resin layer, so that fungi and bacteria are liable to multiply when used in a humid place such as a waterside or a place in contact with the ground. Environment. In addition, we give wood feeling,
Despite being used for applications that directly touch a part of the human body, such as hands, no sanitary considerations have been made.

[0003]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and provides a synthetic wood having excellent antibacterial properties.

[0004]

In order to achieve the above object, the synthetic wood of the present invention comprises an inorganic or organic antibacterial agent blended in at least the surface of a synthetic resin layer made of a foamable synthetic resin.

[0005] The synthetic wood of the present invention comprises a plurality of synthetic resin layers made of an expandable synthetic resin, and an inorganic or organic antibacterial agent is blended in the synthetic resin layer on the surface.

Further, the synthetic wood of the present invention has a compounding ratio of an inorganic or organic antibacterial agent to the synthetic resin layer of 0.1 to 2%.
wt%.

Further, in the synthetic wood of the present invention, the inorganic antibacterial agent is a silver-based inorganic antibacterial agent.

Further, the synthetic wood of the present invention has a synthetic resin layer in which 0.2 to 5 parts by weight of a foaming agent is blended with respect to 100 parts by weight of the resin.

Further, the synthetic wood of the present invention is one in which 5 to 40 parts by weight of wood flour is blended with 100 parts by weight of the synthetic resin layer.

[0010]

Embodiments of the present invention will be described below. In the figure, 1 is a synthetic resin layer, 2 is a core material, and 3 is a non-slip layer. The synthetic resin layer 1 is made of a foamable synthetic resin. The foamable synthetic resin is obtained by blending a foaming agent into the synthetic resin as appropriate. The synthetic resin layer 1 contains an antibacterial agent, wood powder, a flame retardant, a filler, a pigment, a plasticizer, as well as an antibacterial agent. , A stabilizer, a foaming aid, an ultraviolet absorber and the like are added as required. The surface of the synthetic resin layer 1 is appropriately shaped with wood grain, wood-like irregularities, etc., so that it has a wood-like appearance.

As the resin used for the foamable synthetic resin, any resin that can be molded, such as extrusion molding and injection molding, may be used.
In addition to thermoplastic synthetic resins such as polyethylene, polypropylene, ABS resin, polyamide, acrylic resin, and polycarbonate, thermosetting resins such as phenol resin, polyester, and urea resin may be used in some cases.

As a foaming agent added to the synthetic resin layer 1, an inorganic or organic compound which releases a large amount of nitrogen gas or carbon dioxide gas by thermal decomposition, an organic solvent which remarkably increases in volume by vaporization, and the like are mixed at an appropriate ratio. The resin is foamed by heat at the time of molding by the molding machine. Azodicarbonamide is used as a blowing agent that releases nitrogen gas, and oxybisbenzenesulfonyl hydrazide is used as a blowing agent that releases carbon dioxide gas. The foaming agent is added in an amount of about 1.5 to 5 parts by weight based on 100 parts by weight of the resin.

As the wood flour, Japanese cedar, cypress, hemlock and the like are often used, and those having a particle size of about 30 to 100 mesh are preferable. The wood flour is used in an amount of about 5 to 40 parts by weight based on 100 parts by weight of the resin.

As a filler added to the synthetic resin layer 1, calcium carbonate, stone powder or the like is used. The filler is usually used in an amount of about 5 to 30 parts by weight based on 100 parts by weight of the synthetic resin.

When the pigment is mixed, it may be mixed uniformly, but the base material 1 may be partially shaded or spotted.

Examples of the inorganic or organic antibacterial agent to be blended in the synthetic resin layer 1 include inorganic ion exchangers such as zeolite;
Inorganic antibacterial agents such as silver, copper, zinc, etc. carried on a porous body,
Organic antibacterial agents such as trimethoxysilyl-propyloctadecylammonium chloride, and inorganic / organic hybrid antibacterial agents by encapsulation or capsule formation are used.

In use, silver-based inorganic antibacterial agents are preferable in consideration of the effect of antibacterial performance, durability, and safety during use, disposal and incineration. Further, the antibacterial agent is 0.1%.
About 1 to 2 wt% is used.

The antimicrobial agent may be incorporated in the entire synthetic resin layer 1, but may be provided at least on the surface of the synthetic resin layer 1.
The antibacterial agent may be blended only in the surface synthetic resin layer, or a film containing the antibacterial agent may be coated on the outside of the synthetic resin layer 1 or a coating film of a paint containing the antibacterial agent may be formed. May be done. In the case of FIG. 2, the synthetic resin layer 1 is the inner layer 1
1. The outer layer 12 has two layers, and only the outer layer 12 contains an antimicrobial agent.

Examples of the inorganic or organic flame retardant compounded in the synthetic resin layer 1 include organic compounds such as phosphorus compounds which generate incombustible heavy gas when heated, halogen compounds such as chlorinated paraffin and chlorinated polyethylene. Flame retardants, antimony oxide,
Inorganic flame retardants such as tin oxide, boron compounds, aluminum hydroxide and magnesium hydroxide are used. Metal oxides such as tin oxide also have a low smoke generating effect.

When the flame retardant is used, it is selected in consideration of the dispersibility in the synthetic resin layer 1 and the safety of gas generated at the time of heating, like other additives. Further, an organometallic complex such as ferrocene or the like may be blended as a flame retardant aid. The flame retardant is used in an amount of 10 to 60 wt%.

In particular, since the ignition temperature is low and the burning rate is high, it is necessary to add a large amount of a flame retardant in the case of highly flammable polyethylene, polypropylene or the like.
60 wt% is used.

When the synthetic resin layer 1 is molded by an extruder, the synthetic resin raw material in the mold is preferably heated uniformly. However, when the synthetic resin layer 1 contains a foaming agent, If a slightly high-temperature part and a slightly low-temperature part are partially generated, the foamed state of the synthetic resin layer 1 can be made dense and dense, and the surface of the synthetic resin layer 1 can be made more wood-like.

The core material 2 is buried and integrated with the synthetic resin layer 1 for reinforcement and other purposes. Normally, a steel pipe is used. Line, FR
A P rod, a paper tube, and the like can be embedded and integrated.

The non-slip layer 3 is provided on the surface of the synthetic resin layer 1 when the synthetic resin layer 1 is used as a floor material.

The anti-slip layer 3 is made of a thermoplastic elastomer. As the thermoplastic elastomer, natural rubber,
Rubber having rubber-like elasticity such as butylene rubber, butadiene rubber, and urethane rubber is used. If necessary, a plasticizer, a stabilizer, a filler, a foaming agent, an ultraviolet absorber, a pigment and the like may be added to the thermoplastic elastomer. When the pigment is mixed, the color should be similar to the color of the synthetic resin layer 1 and dark.

As means for providing the non-slip layer 3 on the surface of the synthetic resin layer 1, for example, a plurality of grooves 13 are formed at appropriate intervals on the surface of the synthetic resin layer 1, and the non-slip layer 3 is formed in the grooves 13. In this case, the dimensions of the groove 13 are 1 to 10 mm in width, 3 to 10 mm in depth, and the dimension between adjacent grooves 13 is about 3 to 50 mm. The cross-sectional shape of the concave groove 13 may be square, semicircular, or the like. However, when the groove 13 is formed in a dovetail shape, it is preferable that the anti-slip layer 3 embedded in the concave groove 13 does not easily come off. Further, the concave grooves 13 may be all parallel to the surface of the base material 1 and may be linear, but may meander appropriately, or the width and depth of the concave grooves 13 may be irregular.

Further, the concave groove 13 may be formed integrally with a molding machine when forming the synthetic resin layer 1, or may be formed by preparing a synthetic resin layer 1 having a smooth surface and then cutting it by reaming or the like. May be.

When the synthetic resin layer 1 is usually molded by a molding machine, the anti-slip layer 3 may be filled and integrated into a groove 13 formed on the surface of the synthetic resin layer 1 by simultaneous molding.
Alternatively, the groove 13 of the synthetic resin layer 1 after molding may be separately filled and integrated. At this time, the anti-slip layer 3 may be exactly fit in the groove 13, but preferably slightly protrudes from the edge of the groove 13. In addition, the concave groove 1 of the synthetic resin layer 1
When filling the anti-slip layer 3 into the anti-slip layer 3, the anti-slip layer 3 may be directly filled or may be filled with an adhesive.

[0029]

Embodiment 1 Next, an embodiment of the synthetic wood of the present invention will be described. First, the following composition was used as the synthetic resin layer 1. High-density polyethylene 66.7 wt% wood flour 16 発 泡 foaming agent 2 カ ル シ ウ ム calcium carbonate 12 顔料 pigment 3 抗菌 antibacterial agent (silver zeolite) 0.3 〃

[0030]

[Example 2] High-density polyethylene 66.4wt% wood flour 16 {foaming agent 2} calcium carbonate 12 {pigment 3} antibacterial agent (silver zeolite) 0.6}

[0031]

Example 3 High-density polyethylene 66.1 wt% wood flour 16 {foaming agent 2} calcium carbonate 12 {pigment 3} antibacterial agent (silver zeolite) 0.9 >>

[0032]

[Example 4] High-density polyethylene 65.6wt% wood flour 16 {foaming agent 2} calcium carbonate 12 {pigment 3} antibacterial agent (silver zeolite) 1.4}

[0033]

[Comparative example]

 High-density polyethylene 67 wt% wood flour 16 発 泡 foaming agent 2 カ ル シ ウ ム calcium carbonate 12 〃 pigment 3 〃

The composition of the above Examples 1 to 4 was 4 cm ×
A resin sheet having a size of 4 cm was prepared and used as samples, and each sample was subjected to an antibacterial test. The test method is to drop the bacterial solution of Escherichia coli and Staphylococcus aureus respectively on the above sample,
A polyethylene film was put on and adhered thereto, and the polyethylene film was stored under conditions of 35 ° C. and a relative humidity of 90% or more, and the viable cell count 24 hours after storage was measured. Table 1 shows the results.

[Table 1]

[0035]

As described in detail above, the synthetic wood of the present invention
Since at least the surface layer of the synthetic resin layer made of an expandable synthetic resin contains an inorganic or organic antibacterial agent,
The synthetic wood surface touched by humans has an antibacterial action and is preferable for hygiene.

When a silver-based inorganic antibacterial agent is blended as an antibacterial agent, the synthetic wood of the present invention exhibits an antibacterial effect based on silver ions, has excellent weather resistance, and has a long-lasting antibacterial effect even outdoors. .

Therefore, the synthetic wood of the present invention is sanitary and can be suitably used as an external facility such as a bench installed on the outdoors in a park or the like, a playground equipment such as a slide, a sidewalk fence or the like.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view of one embodiment of the synthetic wood of the present invention.

FIG. 2 is a sectional view of another embodiment of the synthetic wood of the present invention.

FIG. 3 is a perspective view of another embodiment of the synthetic wood of the present invention.

[Explanation of symbols]

 Reference Signs List 1 synthetic resin layer 11 inner layer 12 outer layer 13 concave groove 2 core material 3 non-slip layer

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B29K 105: 04 511: 14 B29L 9:00

Claims (6)

[Claims] 1. Synthetic wood in which an inorganic or organic antibacterial agent is blended into at least a surface layer of a synthetic resin layer made of a foamable synthetic resin. 2. The synthetic wood according to claim 1, wherein a plurality of synthetic resin layers made of an expandable synthetic resin are provided, and an inorganic or organic antibacterial agent is blended in the surface synthetic resin layer. 3. The synthetic wood according to claim 1, wherein the mixing ratio of the inorganic or organic antibacterial agent to the synthetic resin layer is 0.1 to 2 wt%. 4. The synthetic wood according to claim 1, wherein the inorganic antibacterial agent is a silver-based inorganic antibacterial agent. 5. The synthetic resin layer is based on 100 parts by weight of the resin.
5. The synthetic wood according to claim 1, wherein the foaming agent is blended in an amount of 0.2 to 5 parts by weight. 6. The synthetic resin layer is based on 100 parts by weight of the resin.
6. The synthetic wood according to claim 1, wherein the wood powder is blended in an amount of 5 to 40 parts by weight.