JP2001151602A - Polymeric micro particle containing essential oil of tree and wax composition including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a wax composition maintaining several effects of essential oil component for long time. SOLUTION: This polymeric particle 1 is obtained by impregnating and maintaining different essential oils of trees in vinyl acetate-based polymeric particle 4 and 5 and preferably forming a shell 2 at outside of the particle wherein the essential oils have same or resembling molecular weight and molecular formula and different structure and another subject wax composition is an acrylic resin-based wax obtained by adding and mixing the polymeric particle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wax composition to be applied to the surface of a wooden interior material such as a floor material of a house, and more particularly to a wax composition containing an essential oil component of a tree. .

[0002]

2. Description of the Related Art Conventionally, wood-based interior materials such as flooring and wall materials coated with wax containing a tree essential oil component have been focused on the activating effect of a tree essential oil component on a human body, a mold suppressing effect, a pest repellent effect, and the like. In addition, building materials in which a tree essential oil component is contained in a surface coating film, panels having a coating layer made of a resin containing the tree essential oil component applied to the surface, and the like have been generally used.

For example, Japanese Unexamined Patent Publication (Kokai) No. 4-221606 describes a building material in which essential oil of a natural tree is microencapsulated and contained in an undercoating film, on which an intermediate coating and a topcoating finish are applied. It is disclosed that the sustained release of the essential oil component of the tree from the surface of the building material is adjusted by adjusting the thickness of the two coating layers of the intermediate coating and the top coating.

Japanese Patent Application Laid-Open No. Hei 8-230108 describes that a deodorizing coating layer in which a vegetable essential oil component is contained in a urethane resin is provided on a panel surface.
No mention is made of the sustained release of essential oil components.

Further, the microencapsulation technique, especially the multilayer emulsion technique, is disclosed in Japanese Patent Laid-Open No. 2-292.
No. 59, but when only one kind of tree essential oil component is used as in this publication, the divergence performance of the tree essential oil component is positively controlled since it is uniformly dispersed in the multi-layered microemulsion. Difficult to do.

[0006] JP-A-4-328182 discloses a wax containing an emulsion containing a tree essential oil component.

[0007]

In recent years, as homes have become more airtight, the number of dual-working homes has increased, and many homes have closed their rooms during the day and are away from home. Even if interior materials such as flooring and wall materials to which tree essential oil components are added or added to the surface are used, the room closed in the daytime will increase in room temperature and the essential oil components will be removed from flooring and wall materials. Divergence is accelerated,
There was a risk that the essential oil components of the tree would emanate and disappear in a short period of time.

Therefore, it was necessary to suppress the divergence by increasing the thickness of the overcoating film. However, when the thickness of the coating film is increased, not only the cost is increased, but when the thickness is too large, the divergence of the essential oil component is suppressed. Conversely, if it is too thin, the essential oil component will emanate in a short period of time, making it extremely difficult to control the sustained-release properties appropriately.

When a floor material containing a tree essential oil component is used for floor heating, the essential oil component diverges in a very short time due to a rise in the temperature of the floor surface, and the effect of the essential oil component is lost. For this reason, it was necessary to increase the thickness of the overcoating film. However, the method of increasing the thickness of the overcoating film had problems in the above-described high cost and controlled release control.
An object of the present invention is to improve these techniques and control the sustained release of essential oils over a long period of time.

[0010]

Means for Solving the Problems As a result of diligent research conducted by the present inventors to solve the above problems, the following solution has been reached. That is, the first invention is a polymer fine particle impregnated and held with a tree essential oil component having a different affinity for the polymer fine particles, wherein the tree essential oil impregnated and held at the central portion and the peripheral portion of the polymer fine particle is provided. The present invention relates to polymer fine particles whose main component is a tree essential oil component.

Further, the second invention relates to polymer fine particles wherein the polymer fine particles are obtained by emulsion polymerization or suspension polymerization.

A third invention relates to a polymer fine particle having the polymer fine particle of the first invention or the second invention as an inner core and further forming an outer shell of a high molecular compound on the outside thereof.

[0013] The fourth invention relates to polymer fine particles in which the polymer fine particles are a vinyl acetate polymer compound and the different tree essential oil components are limonene and α-pinene.

[0014] The fifth invention relates to a wax composition to which an emulsion or suspension containing the polymer fine particles of the above inventions is added and mixed.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the present invention will be described in detail with reference to the drawings. FIG. 1 is a conceptual diagram showing the double-structured polymer fine particles of the present invention. And 1 indicates double structure polymer fine particles,
2 indicates an outer shell, 3 indicates an inner core, 4 indicates a peripheral portion of the polymer fine particles, and 5 indicates a central portion of the polymer fine particles. 6 indicates α-pinene, and 7 indicates limonene.

The present invention focuses on the fact that the affinity for polymer fine particles differs depending on the essential oil component of the tree.
Here, as the polymer fine particles, in addition to vinyl acetate resins such as vinyl acetate resin, ethylene-vinyl acetate resin, and acryl-vinyl acetate copolymer resin, acrylic resin, polyester resin, polypropylene resin and the like can be used.

The tree essential oil components having different affinities for the polymer fine particles include a combination of α-pinene and limonene, a combination of terpineol and cineole, a combination of limonene and pinene and cineole, and the like. Although these have the same or very similar molecular formulas, they have different tertiary structures and different affinities for polymer fine particles. Therefore, the impregnation absorption positions for the polymer fine particles are different.

Among the above combinations, the most preferred combination is inexpensive, easily available, and in terms of the impregnation into the polymer fine particles and the control of the sustained release of the essential oil component of the tree. Using a resin and using a combination of α-pinene and limonene as a combination of tree essential oil components.

In this case, limonene is mainly impregnated and absorbed in the center of the polymer fine particles, and α-pinene is mainly absorbed in the periphery thereof. From the polymer fine particles thus obtained, α-pinene in the peripheral portion diverges in an appropriate amount to satisfy the biological effect, and then limonene moved from the central portion to the peripheral portion diverges, so that the essential oil component for a long time Will be emitted in an appropriate amount.

The polymer fine particles can be obtained as a so-called emulsion dispersed in a dispersion medium by emulsion polymerization or suspension polymerization. The tree essential oil components are preferably added to this emulsion sequentially, that is, the first component is added to the emulsion, and if necessary, the polymer particles are impregnated and absorbed by continuing to stir while heating, followed by adding the second component By performing the same operation, the tree essential oil components can be impregnated and absorbed at different positions of the polymer fine particles by utilizing the difference in affinity between the polymer fine particles and the tree essential oil component. This difference in the impregnation absorption position greatly contributes to the sustained release of the essential oil components of the tree.

When it is desired to enhance the sustained-release property, a polymerizable monomer and a polymerization initiator are added to the emulsion, and a stirring reaction is carried out while heating, if necessary, so that the outside of the polymer fine particles can be increased. It is a double-structured polymer fine particle covered with a molecular compound, that is, a so-called double-structured polymer fine particle-containing emulsion. At this time, an acrylic resin, a polypropylene resin, a polyester resin, or the like can be used as the outer shell resin constituting the outer shell of the polymer fine particles. However, when the polymer fine particles are a vinyl acetate resin, an acrylic resin is used for a tree. This is preferable for the sustained release of essential oil components.
The thus obtained emulsion containing polymer fine particles impregnated with different tree essential oil components can be added to a known wax and mixed to obtain a wax composition having excellent sustained release properties.

The wax used in the present invention can be appropriately selected from known natural waxes and synthetic waxes. Examples of natural waxes that can be used in the present invention include, for example, animal waxes such as beeswax, wool fat, spermaceti, vegetable waxes such as carnauba wax, wood wax, or mineral waxes such as montan wax and paraffin wax. Is mentioned. In addition, examples of the synthetic wax include an acrylic or acryl-styrene emulsion.

A synthetic resin wax such as a polypropylene resin and a polyester resin can be used in addition to the acrylic resin. However, considering the performance as a wax used for wood interior materials such as flooring materials and wall materials, an acrylic resin may be used. Wax is most suitable. That is, an acrylic resin wax is most suitable in terms of the danger that the wooden flooring material will slip too much due to the waxing, and the anti-staining and protective power of the surface of the wooden interior material.

The tree-structured polymer fine particles containing the essential oil component of the tree obtained as described above are mixed with the acrylic resin 1 of wax.
Depending on the purpose, the desired wax composition is obtained in an amount of 3 parts by weight or more. By setting the addition amount of the double-structured polymer fine particles to 3 parts by weight or more, various effects of the tree essential oil component can be expected, including a long-term fragrance and pest repellent effect due to appropriate divergence of the tree essential oil component. .

[0025]

Next, the present invention will be described specifically with reference to examples and comparative examples. [Example 1] α-Pinene and limonene were used as a combination of those which are inexpensive and easy to emit as tree essential oil components and which have different steric structures in consideration of affinity for vinyl acetate resin.

As a method for preparing the double-structured polymer fine particles, first, an ethylene-vinyl acetate copolymer emulsion (polysol EF, Showa Showa) having a resin content of 45% and emulsion-polymerized in the presence of a nonionic surfactant is used. Polymer Co., Ltd.) 10
While heating and stirring 0 parts by weight, 20 parts by weight of limonene is first added and the mixture is aged for 24 hours. In this way, after the limonene is sufficiently impregnated and absorbed in the center of the polymer fine particles, 20 parts by weight of α-pinene is subsequently added and aged for 24 hours. Next, methyl methacrylate,
0.5 parts by weight of azobisisobutylnitrile was added to 15 parts by weight of the acrylic acid-mixed monomer, and the mixture was reacted while stirring at 80 to 85 ° C. for 2 hours, and then slowly cooled to react the acrylic resin as the outer shell resin. The emulsion was allowed to adhere to obtain an emulsion containing double structure polymer fine particles. Subsequently, the above emulsion was added to 100 parts by weight of the acrylic resin of the acrylic synthetic wax so as to contain 5 parts of the above-mentioned tree structure essential oil component-containing double-structured polymer fine particles to prepare a desired wax composition. did. The thus the wax composition created flooring 1 m ² per to 30g applied to the wood flooring surface, to produce a wood flooring sample.

The effectiveness of the thus obtained sample of Example 1 was tested by the following method. In the test conducted, the amount of each terpene such as α-pinene and limonene emitted in a temperature range of 20 ° C. was measured. The measurement method is to prepare a floor material to be a sample, and to set the start time, 1 day, 3 days, 7 days, 14 days and 2 days in a room adjusted to a test temperature of 20 ° C.
After 8 days and 56 days after, leave still for the number of days elapsed. The ventilation condition in this room was 0.5 times / 1 hour. After doing so, the frontage, height, and depth dimensions are reduced to the size of a normal average dwelling room space, ie, 36 × 36.
Each sample was placed in a measuring box of 20 cm
Let stand for 4 hours, and then immediately remove the air in the box with TENA
The mixture was adsorbed on an X-GC tube, and then quantitative analysis of limonene and α-pinene was performed by GC-MS, that is, gas chromatography-mass spectrometry. The emission concentration of tree essential oil components of the wax composition prepared by adding 5 parts of the double-structured polymer fine particles by the above method was measured after the elapse of the following days. The results are shown in Table 1 below.

[0028]

Example 2 Next, a wax composition of the present invention was prepared in the same manner as in Example 1 except that the amount of the double-structured polymer fine particles was changed to 3 parts. The emission concentration of the essential oil component was measured in the same manner as in Example 1. Table 2 shows the results.

[0030]

As can be seen from Tables 1 and 2, when 5 parts and 3 parts of the limonene and α-pinene double structure polymer fine particles of the present invention are added, it goes without saying that
The addition of 5 parts maintains a higher concentration of both limonene and α-pinene. Then, the concentration of each essential oil component emitted into the air changes with the number of days elapsed as shown in the above table.

That is, in both cases of adding 5 parts and adding 3 parts, α-pinene mainly impregnated and absorbed in the periphery of the inner core of the double-structured polymer fine particles has a high initial concentration but gradually decreases with the passage of time. Decrease. To compensate for this, limonene mainly impregnated and absorbed in the center of the inner core of the double-structured polymer fine particles has a low initial concentration, but gradually increases with time, and reaches a maximum value on the seventh day. Thereafter, the concentration gradually decreases, but the high concentration can be maintained for a relatively long period.

In both cases of addition of 5 parts and addition of 3 parts, when these two components were combined, the concentration of 0.2 microgram was maintained even on the 56th day. It can be seen that the tree essential oil component concentration, which is the source of various effects such as suppression of reproduction and repellent effect against insects such as cockroaches, is maintained for a long period of time.

The limonene impregnated and absorbed in the center of the vinyl acetate resin, which is the inner core of the double-structured polymer fine particles of the present invention, and the α-pinene impregnated and absorbed in the peripheral portion are located at the positions where the impregnation is absorbed. Due to the difference, the divergence timing of the divergence period, such as the divergence at the early stage and the divergence at a late stage, can maintain the essential oil component concentration for a long time.

Next, a comparative example is shown below. [Comparative Example 1] In the same manner as in Example 1 except that 20 parts by weight of limonene alone was used as a tree essential oil component, an emulsion containing fine particles of a double structure polymer impregnated and absorbed only with limonene was prepared. 5 parts by weight of polymer fine particles were added to 100 parts by weight of the acrylic resin to prepare a wax composition of Comparative Example 1. The emission concentration was measured in the same manner as in Examples 1 and 2. Table 3 shows the results.

[0036]

As can be seen from Table 3, the wax obtained by adding 5 parts of the double-structured polymer fine particles composed of limonene alone had a limonene emission concentration of 0.1 microgram on the third day.
It was not detected on the seventh day, indicating that the divergence persisted only for a short period.

[0038]

The difference in the three-dimensional structure of the tree essential oil component causes a difference in the affinity for the polymer fine particles, and the divergence rate of the essential oil component depends on whether the polymer fine particles are impregnated and absorbed in the central part or in the peripheral part. Differences occur. Utilizing this divergence rate difference, the essential oil component is a source of bio-efficacy, including various effects of the essential oil component, such as activation of the human body, suppression of mold, suppression of mite propagation, and repellent of cockroaches. It has become possible to provide a wax composition that can maintain the radiated concentration of the wax composition for a long period of time. In a highly airtight and highly insulated house, this wax composition is excellent in the long-term sustainability of essential oil component emission even if there is an abnormal rise in the room temperature due to the closing of a room that tends to be away during the day.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing a double-structured polymer fine particle of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Double-structured polymer fine particle 2 Outer shell 3 Inner core 4 Peripheral part of polymer fine particle 5 Central part of polymer fine particle 6 α-pinene 7 Limonene

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Claims (5)

[Claims] 1. A polymer fine particle impregnated and held with a tree essential oil component having a different affinity for the polymer fine particle, wherein the main component of the tree essential oil impregnated and held at the center and the periphery of the polymer fine particle is Polymer fine particles characterized by different tree essential oil components. 2. The method according to claim 1, wherein the fine polymer particles are obtained by emulsion polymerization or suspension polymerization.
The polymer fine particles according to the above. 3. Polymer fine particles characterized in that the polymer fine particles according to claim 1 or 2 are used as an inner core, and an outer shell of a polymer compound is further formed outside thereof. 4. The polymer microparticle according to claim 1, wherein the polymer microparticle is a vinyl acetate polymer compound, and the different tree essential oil components are limonene and α-pinene. . 5. A wax composition obtained by adding and mixing an emulsion or suspension containing the polymer fine particles according to claim 1 to wax.