JPH03268901A - Wooden flooring and its manufacture - Google Patents

Abstract

PURPOSE:To enable display of a basking effect in the wood and evasion effect of sanitary harmful insect extending over a long period without depending on a kind of a material, by coating the surface of wooden flooring with a paint containing an ingredient having the high boiling point such as cinnamic aldehyde mixed with natural essential oil. CONSTITUTION:Natural essential oil consisting mainly of at least a kind of an ingredient having the high boiling point, which is selected out of cinnamic aldehyde, coumarin and citronelal and a terpene kind or a sesquiterpene kind is contained in a paint which is coating the surface of wooden flooring. At this time, after the ingredient having high boiling point such as natural essential oil or cinnamic aldehyde is diluted up to density of 50% with a diluting agent such as ethyl acetate, the same is mixed up with coating thinner. Then the diluted solution is added to a paint main agent, to which a curing agent and the thinner are added and viscosity of the paint is controlled. Then a basking effect in the wood and evasion effect of sanitary harmful insect can be added easily and extending over a long period by applying the obtained paint to the surface of the wooden flooring.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a wooden flooring material and a method for producing the same, and more particularly to a wooden flooring material having a so-called forest bathing effect and an effect of repelling sanitary pests, and a method for producing the same.

(Prior Art) It is known that natural essential oils mainly composed of terpenes or sesquiterpenes emitted by trees have the effect of forest bathing on the human body, and also have the effect of repelling sanitary pests such as mites and cockroaches. Since then, these natural essential oils have come to be used not only as fragrances and insect repellents, but also in various fields.

Especially today, when the occurrence of dust mites on tatami mats and carpets has become a social problem, there are high expectations for wood flooring materials containing these natural essential oils.

Under these circumstances, a wooden flooring material has recently been proposed in which the adhesive layer between the decorative veneer and the plywood contains emulsified natural essential oils.

However, in the above wooden flooring materials, the adhesive layer,
Natural essential oils are released into the atmosphere only after passing through the decorative veneer and the paint film, respectively. Therefore, for example, in the case of wooden flooring with a decorative wood veneer reinforced with synthetic resin applied to the upper surface or with a thick coating of polyester paint on the upper surface, natural essential oils cannot pass through the surface layer. However, it has the disadvantage that it cannot obtain the effects of natural essential oils.

(Problems to be Solved by the Invention) As a result of intensive studies to solve the above-mentioned drawbacks, the inventors of the present invention found that: ■ Natural essential oils are substances that are difficult to evaporate and their scent lasts for a long time; ■ Wood Particularly high boiling point components such as cinnamic aldehyde, coumarin, and citronellal (hereinafter referred to as cinnamic aldehyde, etc.) contained therein have excellent sustained release properties and are highly effective in repelling sanitary pests such as mites and cockroaches. Focusing on the fact that natural essential oils and their high-boiling components have good compatibility with thinners used in paints, we mixed natural essential oils with high-boiling components such as cinnamic aldehyde, and incorporated this into the paint to create wood-based paints. The present invention has been achieved by discovering that by coating the upper surface of the flooring material, it is possible to easily and long-term add the so-called forest bathing effect and sanitary pest repellent effect to any type of wooden flooring material. did.

Therefore, the first object of the present invention is to provide a wooden flooring material that can exhibit a forest bathing effect and sanitary pest repellent effect over a long period of time, regardless of the type of material composing the wooden flooring material.

A second object of the present invention is to provide a method for manufacturing a wooden flooring material that can be applied to any type of wooden flooring material and has a forest bathing effect, sanitary pest repellent effect, etc. be.

A third object of the present invention is to provide a method for manufacturing a wooden flooring material that is not only effective for forest bathing but also particularly effective for repelling sanitary pests.

(Means for Solving the Problems) The above-mentioned aspects of the present invention provide a wooden flooring material whose upper surface is coated with a paint, in which the paint contains at least one selected from cinnamic aldehyde, coumarin, and citronellal. This has been achieved by a wood flooring material characterized by containing a natural essential oil whose main components are high-boiling point components of various species and terpenes or sesquiterpenes, and a method for producing the same.

Hereinafter, the natural essential oil-containing wooden flooring material of the present invention and its manufacturing method will be described in detail.

The natural essential oils used in the present invention include cypress leaf oil, cypress wood oil,
It is possible to appropriately select and use known raw materials whose main ingredients are terpenes or sesquiterpenes, such as Chinese fir, Soviet fir, eucalyptus, cedar, cypress, lemon, orange, lavender, etc., but natural From the perspective of sustaining the effects of essential oils over a long period of time, we use cypress leaf oil, cypress wood oil, Chinese fir, soviet fir, eucalyptus, cedar, cypress,
It is preferable to use natural essential oils such as lavender.

In the present invention, in addition to the above natural essential oil, at least one high-boiling component selected from cinnamic aldehyde, coumarin, and citronellal is used.

Cinnamaldehyde, coumarin, citronellal, etc. used as high-boiling point components in the present invention are wood extract components that are highly effective in repelling sanitary pests, and by adding these, the repelling effect on sanitary pests can be maintained for an extremely long period of time. I can do it.

Here, if the amount of cinnamaldehyde etc. is 10 parts by weight or less per 1.0 parts by weight of natural essential oil mainly composed of terpenes or sesquiterpenes, the biological effect will be reduced;
If the amount is more than 1 part by weight, the concentration in the air and the biological effect will be high, but the odor will be strong and the aroma effect will be negative. Therefore, the mixing ratio of the natural essential oil and the high boiling point component such as cinnamic aldehyde is preferably 100:10 to 15 (weight ratio) in consideration of aroma, sustained release properties, biological effects, etc.

In the present invention, the above-mentioned natural essential oils and high-boiling components such as cinnamic aldehyde are mixed with a diluent such as ethyl acetate to a concentration of 50%.
Mix with paint thinner after diluting to 100%.

Next, the diluted solution is added to the paint base, and a curing agent and thinner are further added to adjust the viscosity of the paint.

The amount of the diluent used is as small as 1 to 2 parts by weight per 100 parts by weight of the paint base material.

The paint obtained as described above is applied to the upper surface of the wooden flooring material to obtain the wooden flooring material of the present invention.

Usually, coating is carried out in three coats, but since the coating used in the present invention is no different from ordinary coatings, coating can be carried out by a conventional method. As needed,
By applying it alternately with a general paint, it is possible to vary the sustained release of the cinnamic aldohite into the atmosphere, biological effects, etc.

It goes without saying that the paint obtained by the production method of the present invention can be used not only for wooden flooring but also for other purposes such as interior wall materials and furniture.

(Effects of the Invention) As detailed above, the method for manufacturing a wooden flooring material of the present invention can be applied to any type of wooden flooring material, and is not limited by the material used.

In addition, the wooden flooring material produced by the method of the present invention contains not only natural essential oils whose main components are terpenes and sesquiterpenes, but also one or more high-density oils selected from cinnamaldehyde, coumarin, and citronellal. Because it contains boiling point components, it is not only effective for forest bathing, but also has an excellent repellent effect on sanitary pests.
The effect can be maintained for a long period of time.

(Example) Example 1 A mixed solution of 100 parts by weight of an unsaturated polyester resin and 1 part by weight of a polymerization initiator was applied to a 0.5 m thick oak slice veneer in an absolutely dry state (moisture content 0 to 3%). A resin-impregnated veneer was obtained by injecting under reduced pressure using an impregnation pot. This resin-impregnated veneer was applied to plywood coated with water-based vinyl urethane adhesive (coating amount: 15 g/shaku 2) at 150°C and 112°C using a hot press.
kg/ci! , by heat pressing under the conditions of 8゛ minutes.
The resin in the veneer was heated and polymerized, and at the same time the resin-impregnated veneer and plywood were bonded together to obtain a plywood having a synthetic resin-impregnated reinforced veneer on the surface.

Next, mix an amino paint as a main ingredient, a curing agent, and a thinner in a ratio of 100:10:X (weight ratio), and apply an amount of 1.9 to 2.2 g on the top surface of the resin-cured veneer. After undercoating and drying, an intermediate coat of the same paint used for the undercoat was applied at a coating amount of 1.5 to 2.0 g/shaku2, and then dried. The amount of thinner added (X) was adjusted using an Iwata cup so that the viscosity of the paint was 12 to 15 sec.

Next, add 5% thinner, cypress essential oil, and cinnamic aldehyde.
Mix at a ratio of 0:45:5 (weight ratio), and add 100% of the paint base, the above natural essential oil mixed solution, curing agent, and thinner.
: 1 : 10 : Y (weight ratio), 6.
A top coat was applied at a coating weight of 5 to 7.0 g/shaku2. The amount of thinner added (Y) is when the paint viscosity is 12 to 1 using an Iwata cup.
It was adjusted to 5 sec.

Biological effectiveness tests against mites, mold, and cockroaches were conducted using the wooden flooring materials obtained as described above and general wooden flooring materials.

The methods and results of each biological effect inhibition test are as follows.

[Mite growth inhibition test]

The wooden flooring material of the present invention and the general wooden flooring material cut into 4 x 41 pieces were each placed in a 9C11 diameter sterilized Petri dish with the painted side facing up, and a medium (powdered feed: About 0.5 g (raft feed + dry yeast) was spread into a 3 x 3 cm area. The number of mites in the medium is approximately 1
There were 00 fish.

The humidity inside this Petri dish was adjusted to about 86% with a saturated potassium chloride solution and stored at a temperature of 25 to 30°C.

One day, nine days, and 20 days after the start of the test, the number of living mites in the medium was counted under a stereomicroscope to determine the mite survival rate for each flooring material. The mite survival rate is the value obtained by dividing the number of surviving mites after the start of the test by the number of surviving mites at the start of the test, and multiplying the result by 100. The results are shown in FIG.
(Same in Figures and Figures 3).

[Mold resistance test]

JIS Z 2991 (1981) r Mold Resistance Test Method” The test was conducted in accordance with the test method for general industrial products and wood and bamboo products.

^spergillus niger IFo
6341, Peniciliu-citrinum
IFO6352, Rh1zopus 5tolonif
er FERMS-7, Cladosporium c
ladosporioides IFO6348 and C
haetomium globosu+w IFO63
After culturing each of the 47 five types of bacterial strains on a potato dextrose agar slant medium in an atmosphere at a temperature of 25°C for 10 days, the spores were suspended in a sterilized 0.05% dioctyl sodium sulfosuccinate aqueous solution, and single spores were cultured. 9 Next, equal amounts of each spore suspension were mixed to obtain a mixed spore suspension.

Test pieces of the wooden flooring material of the present invention and general wooden flooring material (each flooring material was tested in duplicate) cut into 5×5C1 sizes were placed in a petri dish.1. Pour the above mixed spore suspension onto it with an apparent surface area of 9c1! The cells were sprinkled evenly at a rate of 0.5 d, covered with a lid, and cultured at a temperature of 28±2° C. and a humidity of 97%.

After 14 and 28 days of culture, the growth state of mycelium that had formed on the surface and sides of the test piece was observed with the naked eye.

The test results are shown in Table 1.

Table 1 Here, A) in the table is a wooden flooring material of the present invention, and B) is a general wooden flooring material (hereinafter, the same applies to Tables 2 to 6). In addition, the numerical values in the table represent the following ° evaluation points (hereinafter, the same applies to Tables 3 and 5).

3: No mycelial growth is observed in the inoculated part of the sample or test piece.

2: The area of mycelia growth observed on the inoculated part of the sample or test piece does not exceed 1/3 of the total area.

1: The area of mycelia growth observed in the inoculated part of the sample or test piece exceeds 1/3 of the total area.

[Cockroach repellent effect test]

A box of 30 x 60 x 30 cgi (length x width x height) was made from plywood, the box was partitioned in the middle with plywood, and a hole was made in a part of the bottom through which cockroaches (black cockroaches) could pass. At the bottom of the partitioned left and right spaces, the wooden flooring material of the present invention and the general wooden decorative veneer flooring material (each 30 x 30
(2) was spread, and the same number of cockroaches (10 each) were released onto each flooring material, and the flooring materials were stored in an atmosphere at 25 to 30° C. with a lid made of plywood. After storage for 241 hours, the lid was removed and the number of cockroaches present on each flooring material was counted.

The test was repeated three times. New boxes and flooring materials were used for each test to avoid the effects of natural essential oils and cockroach odors. Note that formalin remaining on the plywood was removed with a formalin catcher agent. Table 2 shows the results of determining the cockroach abundance rate from the number of cockroaches present on each flooring material 24 hours after the start of the test.

The cockroach abundance rate is the value obtained by dividing the number of cockroaches present on each flooring material by the total number of cockroaches tested and multiplying the result by 100.

The results shown in Table 2 and above demonstrate the effectiveness of the wooden flooring material of the present invention against mites, mold, and cockroaches. This effect is presumed to be mainly due to high boiling point components such as cinnamic aldehyde. Thus, it has been confirmed that a high biological effect can be obtained by simply adding a small amount of cinnamic aldehyde or the like to the paint.

Example 2 A wooden flooring material was prepared in the same manner as in Example 1, except that citronellal was used, and the biological effectiveness test against mites, mold, and cockroaches was conducted in the same manner as in Example 1.

FIG. 2 shows the results of the mite growth inhibition test, Table 3 shows the results of the mold resistance test, and Table 4 shows the results of the cockroach repellent effect test.

Table 3 Table 4 Comparative Example I A wooden flooring material was produced using only cypress essential oil without adding cinnamic aldehyde' and in the same manner as in Example 1 except for the production method of Example 1. A similar biological effect test was conducted to compare the effect with the case where cinnamic aldehyde was added.

FIG. 3 shows the results of the mite growth inhibition test, Table 5 shows the results of the mold resistance test, and Table 6 shows the results of the cockroach repellent effect test.

From the results shown in Table 5 and Table 6, it is clear that hygienic and biological effects occur even when only natural essential oils containing terpenes or sesquiterpenes as the main components are added, but high-boiling components such as cinnamic aldehyde are added. It has been proven that the sanitary and biological repellent effects of wooden flooring materials are significantly superior.

Example 3 Assuming that the wooden flooring of the present invention obtained in Example 1 is to be installed on an 8 tatami area, an 8 tatami area was placed in a test box whose volume is equivalent to 1/1000 of an 8 tatami area. It was estimated by placing the wooden flooring material of the present invention on the bottom surface and measuring the air concentration inside the box so that the ratio was as follows.

To measure the airborne concentration, leave the wooden flooring material of the present invention in the above-mentioned box for a certain period of time, attach a vacuum pump to the Tenax GC tube, suck the air inside for a certain period of time, and measure the components adsorbed to the filler. was quantitatively analyzed using GC-MS, and the air concentrations of terpenes or sesquiterpenes and high-boiling components were calculated from the ratio of these adsorbed components and a collection device using a vacuum pump.

According to the above measurement method, the air concentration when using the wooden flooring material of the present invention immediately after manufacture was 5 to 6 PPb (IPPm/10
00), and the airborne concentration when using wooden flooring material one year after manufacture was approximately IPPb.

The above measurement results demonstrated that although the airborne concentration decreases over time, sustained release properties are maintained.

Example 4 Using the flooring material of the present invention obtained in Example 1, immediately after production,
The results of olfactory sensory tests conducted by 20 people on the surface of the wooden flooring material of the present invention one year after manufacture and two years after manufacture were as follows, although there were differences in degree depending on the test person. I got good results.

Immediately after production Two scents → strong After one year of production, the scent is found to be strong.

After 2 years of manufacture, two scents → slightly noticeable.

From the above results, it was estimated that the sustained release properties would be sufficiently maintained for approximately several years.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the results of the mite growth inhibition test in Example 1. FIG. 2 is a diagram showing the results of a mite growth inhibition test in Example 2. FIG. 3 is a diagram showing the results of a mite growth inhibition test in Comparative Example 1. In the figure, . is a wooden flooring material of the present invention, and O is a general wooden flooring material. Fig. 1 Fig. 3 Fig. 0 (0 Number of preservation days (days) Fig. 2 Number of preservation days (days) Number of preservation 11 (days) 0

Claims (1)

[Scope of Claims] 1) A wooden flooring material whose upper surface is coated with a paint, in which the paint contains at least one high-boiling point component selected from cinnamic aldehyde, coumarin, and citronellal, and terpenes or sesquiterpenes. A wood flooring material characterized by containing natural essential oils whose main ingredients are: 2) After adding at least one high-boiling point component selected from cinnamaldehyde, coumarin, and citronellal and a natural essential oil mainly composed of terpenes or sesquiterpenes to a paint diluent, and then mixing with the paint. A method for producing a wooden flooring material, which comprises applying the coating to the wooden flooring material. 3) The mixing ratio of natural essential oil containing terpenes or sesquiterpenes as a main component and at least one high-boiling component selected from cinnamaldehyde, coumarin, and citronellal is within the range of 100:10 to 15. 2. The method for producing a wooden flooring material according to 2.