JPH04310701A - Moody reinforced interior material containing natural volatile oil - Google Patents

Abstract

PURPOSE:To take effect of the activation of human bodies, control the propagation of mites, fungi and the like and simultaneously provide a woody reinforced interior material retaining repellency effect to cockroaches for a long time. CONSTITUTION:A woody reinforced interior material is manufactured by injecting unsaturated polyester resin containing 5 to 25% of natural volatile oil into a woody decorative veneer together with a reaction starting agent under the reduced pressure or pressurized condition, and then laminated integrating said woody decorative veneer on a woody base such as a polywood together with a bonding agent or without a bonding agent.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hardened wood interior material having on its surface a decorative wood veneer impregnated with an unsaturated polyester resin containing natural essential oils.

0002

[Prior Art] It has been reported that the aroma of wood aroma components released from wood, namely natural essential oils (phytoncide), refreshes people's mood, prevents stress, and is effective in activating the human body. has been done. In recent years, attention has been focused on this effectiveness, and interior building materials such as flooring and wall materials using various natural essential oils have been developed. These wood components also have the effect of preventing health problems caused by household pests such as mites and cockroaches that breed on carpets, etc., which are often used in general homes, so they are used as healthy and clean building materials. It has been attracting attention. When using this wood component for reinforced wood flooring that has a synthetic resin-infused reinforced decorative veneer on its surface, it can be used for reinforced flooring that has a decorative veneer bonded to a wood base material with an adhesive containing natural essential oils, or for synthetic A possible reinforced flooring material is one in which a resin-infused decorative veneer is laminated on the surface of a wooden base material and then painted with a paint containing essential oil components.

0003

[Problems to be Solved by the Invention] However, in the former case, there is a problem that the natural essential oil in the adhesive is not easily sustainedly released outside the system and the effect derived from the natural essential oil component is not expressed. In some cases, there is a problem that there are restrictions on the type and amount of natural essential oils that can be used, and therefore there has been a desire for a reinforced interior material that has reinforcing performance and appropriate sustained release properties.

The present invention was developed in view of the above-mentioned problems, and has the effect of activating the human body, suppresses the proliferation of mites and mold, and at the same time retains the effect of repelling cockroaches for a long time. The aim is to continue providing wood-reinforced interior materials.

[0005]

[Means for Solving the Problems] That is, the present invention involves injecting an unsaturated polyester resin containing 5 to 25% of natural essential oil into a decorative wood veneer together with a reaction initiator under reduced pressure or pressure, and then adding it together with an adhesive. Alternatively, it is a wood-reinforced interior material characterized in that the wood decorative veneer is laminated and integrated on a wood substrate such as plywood without using an adhesive.

[0006]

[Function] This interior material uses a wooden substrate such as plywood as the base material, and a decorative wooden veneer injected with unsaturated polyester resin containing natural essential oils is laminated on top of it, so the base material, the wooden substrate, is used as the interior material. It exhibits strength as a material, and in the case of decorative wood veneers, natural essential oils are continuously emitted through the unsaturated polyester resin.

[0007]

[Example] First, as the decorative wood veneer used in the present invention, a decorative wood veneer such as a straight-grained Japanese pine veneer or a Japanese cypress grain veneer having a thickness of 0.3 to 2.5 mm is used. These veneers are heat-cured and impregnated with unsaturated polyester resin to which natural essential oils have been added. As the natural essential oil added to this unsaturated polyester resin, it is particularly preferable to select and use a natural essential oil having a double bond or triple bond in the molecule, similar to styrene. Examples of these include camphene, camphene, etc. limonene, β-terpineol,
Examples include isopulegol, citronellal, eugenol, and the like.

[0008] These natural essential oils are obtained by impregnating and retaining the natural essential oil in polymer particles obtained by emulsion polymerizing an unsaturated monomer having a polymerizable unsaturated double bond in water. A multilayer structure emulsion may be used in which an unsaturated monomer having a polymerizable unsaturated double bond containing an oil-soluble polymerization initiator is polymerized on the surface of the polymer. In this case, examples of the unsaturated monomer having a polymerizable unsaturated double bond include acrylic acid, methyl methacrylate, vinyl acetate, etc., and examples of the oil-soluble polymerization initiator include benzoyl peroxide,
Cumene hydroperoxide and the like can be used.

[0009] Generally, the effects of natural essential oils can be made sufficient by increasing the amount of the oil added. However, if a large amount of natural essential oil is added, the hardness of the resin after curing will increase too much, and cracks (microscopic cracks) will occur in the resinized veneer due to environmental changes (changes in temperature and humidity) after it is made into a product. It becomes easier. Therefore, the upper limit was set at 25%. On the other hand, if it is 5% or less, a higher proportion of the resin is dispersed into the air than reacted in the resin due to the heating operation of a hot press when curing and pasting the resin-impregnated veneer. Based on the above, the appropriate amount of natural essential oil to be added to the unsaturated polyester resin is in the range of 5 to 25%. These wooden decorative veneers may be coated with a polyurethane resin paint or the like, if necessary. Furthermore, these injected thermoset veneers of unsaturated polyester resin are adhered to wood substrates with oil-based or water-based adhesives, but if necessary, coloring or hiding pigments such as red iron oxide and titanium dioxide may be added. Also good. The wooden substrate may be a wooden plate-like substrate such as plywood, particle board, fiberboard, etc., and has a thickness of about 5 to 25 mm.

Specific Example 1 After adding 25 parts by weight of natural essential oil obtained from cypress leaves by steam distillation to 100 parts by weight of unsaturated polyester resin,
After stirring at a temperature of 20° C. for about 4 hours, 2 parts by weight of benzoyl peroxide was added as a reaction initiator to prepare an impregnating solution. On the other hand, a 1.0 mm thick rice pine straight-grain impregnated veneer with a moisture content of 4% was inserted into the reaction vessel and degassed for 2 hours (10 t
After injecting the impregnating solution, it was held overnight under a pressure of about 9 kg/cm 2 to perform an impregnating treatment. Next, the impregnated veneer was stacked on a plywood board having a thickness of 12 mm to which red iron oxide-added adhesive was applied at a rate of 10 g/square, and heat and pressure treatment was performed for 20 minutes at a temperature of 130°C and a pressure of 8 kg/cm2. The wood-reinforced flooring material was obtained.

Specific Example 2 5 parts by weight of a mixture of 25% each of α-pinene and limonene was added to 100 parts by weight of unsaturated polyester resin to natural essential oil obtained from eucalyptus leaves by steam distillation. After stirring for 6 hours at a temperature of 20° C., 1 part by weight of benzoyl peroxide was added as a reaction initiator to prepare an impregnating solution. On the other hand, a 1.2 mm thick cypress grain impregnation veneer with a water content of 6% was inserted into the reaction vessel and degassed for 1 hour (12
torr), and after injecting the impregnating solution, the pressure was returned to normal and left overnight. Next, the impregnated veneer was layered on a 15 mm thick plywood coated with an adhesive containing 1 part by weight of titanium dioxide at a rate of 12 g/square meter at a temperature of 130°C and a pressure of 8 kg/cm2 for 20 minutes. A wood-reinforced entrance baseboard was obtained by applying heat and pressure treatment.

Comparative Example 1 A wood-reinforced flooring material was produced in the same manner by adding 3 parts of the same natural essential oil as used in Example 1 to 100 parts of the red iron oxide-added adhesive in Example. Figure 1 shows the performance of the wood-reinforced members obtained in the above Examples and Comparative Examples. Figure 1 shows the release of natural essential oil components into the air over time, and Table 1 and Table 1 show the test effects of the cockroach repellent effects of each example. Indicated by 2.

[Table 1]

[Table 2]

[0013] The cockroach repellent efficacy test was conducted using the following method and procedure. A box measuring 30 x 60 x 30 cm (length x width x height) was made of vinyl chloride, the middle of the box was partitioned with plywood, and a hole was cut in a part of the bottom for cockroaches to pass through. Lay each floor cut to 30 x 30 cm at the bottom of the partitioned left and right spaces, release the same number of cockroaches (10 each) onto each floor, cover and leave in an atmosphere at 25 to 30 degrees Celsius for 24 hours. saved. The test was conducted between 14:00 and 14:00 (24 hours) the next day, taking into account the nocturnal behavior of cockroaches. After a predetermined period of time had elapsed, the lid was removed and the number of cockroaches present on each floor was counted to determine the abundance rate and the cockroach repellency index for the control on the floor containing natural essential oil (repeated 4 times). The cockroach abundance rate is determined by Formula 1, and the cockroach repellency index is determined by Formula 2 based on the above abundance rate.

[Math 1]

[Formula 2] Note that the effectiveness increases as the cockroach repellent index goes from 0 to 100. Furthermore, Table 3 shows the results of the mold resistance test in the above Examples and Comparative Examples.

[Table 3]

[0014] The mold resistance test method is JIS Z2911 (
1981). That is, after each strain was cultured on a botetotextrose agar slant medium at 25°C for 10 days, the spores were suspended in a sterilized 0.005% dioctyl sodium sulfosuccinate aqueous solution to obtain a single spore suspension. In addition, each floor cut into 5 x 5 cm was placed in a Petri dish, and the mixed spore suspension was poured over it to give an apparent surface area of 9.
Sprinkle evenly at a ratio of 0.5ml per cm3,
It was covered with a lid and cultured at a temperature of 28±2°C, about 97%. After 14 and 28 days of culture, the growth state of hyphae formed on the front and back surfaces of the test piece was observed with the naked eye (conducted with n=3).

11. Collected from flooring material after a predetermined period of time.
A 4 cm square test piece was placed in a well-ventilated aluminum box (36 x 36 x 24 cm) and left at a temperature of 20 to 25°C for 24 hours, and the essential oil components volatilized into the atmosphere inside the box were Collect into a TENAX GC tube via a mini pump with adjusted flow rate. Then T
The amount of alphapinene and limonene in the essential oil absorbed into the ENAX GC tube was quantified by GC-MS method, and the amount of essential oil components released was determined by the calculation formula consisting of Equation 3 below.

[Math 3]

[0016]

Effects of the Invention: In the wood-reinforced flooring material of the present invention, the natural essential oil is diffused through the unsaturated polyester resin polymer, so it has a sustained release compared to when it is directly added to paints or adhesives. Are better. In addition, if the natural essential oil added to the unsaturated polyester resin has double bonds like styrene, it will not impair the physical and chemical performance of the unsaturated polyester resin. It is a wood-reinforced interior material that has excellent repellent effects against household pests and suppressive effects against mold and the like, and has excellent overall durability and abrasion resistance.

[Brief explanation of drawings]

FIG. 1 is a diagram illustrating the divergence of essential oil components.

Claims (1)

[Claims] 1. A hardened wood interior material comprising a wood decorative veneer impregnated and cured with an unsaturated polyester resin containing 5 to 25% natural essential oil components, and laminated on a wood substrate.