JP2001192563A - Functional resin molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly practical functional resin molding exhibiting a uniform effect for a long time, avoiding a problem of deteriorating work environment during its manufacture, and also favorably avoiding a problem of a bleed-out phenomenon. SOLUTION: This functional resin molding comprises a synthetic resin, a fibrous material 3, and a functional agent, and characterized by the fact that the functional agent is dispersed in the molding supported by an inorganic porous microsphere 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a functional resin molded article which can exhibit a specific function in a molded article by incorporating a functional agent into a synthetic resin, and more particularly, to a method of using an inorganic porous resin as a functional resin. The present invention relates to a functional resin molded article capable of maintaining the effect of an active ingredient of a functional agent uniformly and for a long period of time by adding the compound to a synthetic resin base material in a state of being supported on fine particles.

[0002]

2. Description of the Related Art Conventionally, attempts have been made to exhibit various functions such as aromaticity and insect repellency in molded articles by incorporating functional agents such as fragrances and insect repellents into synthetic resins. I have.

[0003] Functional agents to be included in the synthetic resin include:
Broadly speaking, there are release functional agents and adsorptive functional agents. The release functional agent is one that exhibits a desired function by evaporating at room temperature or a specific temperature condition and releasing the active ingredient into the atmosphere, for example, an aromatic agent, a rust inhibitor,
Repellents, antibacterial agents and the like are typical examples. on the other hand,
The adsorptive functional agent exerts a desired function by adsorbing a specific component among various components existing in the air or the surrounding environment. Typical examples include a desiccant, an odor absorber, and a gas absorber.

When a resin molded article (functional resin molded article) capable of exhibiting a specific function by incorporating such a functional agent is manufactured, for example, the functional agent is heated in a heated state. It is mixed into the material and molded into a desired shape by injection molding or the like.Also, the base material is first formed into a pellet shape, impregnated with a functional agent, and then molded into a desired shape. A product is adopted.

[0005]

However, conventional functional resin molded articles have the following problems.
First, there is a problem of uniformity and sustainability of the effect. In such a functional resin molded product, it is desirable that the same effect can be maintained for a long time,
Therefore, in the case of a resin molded article containing a release functional agent, it is necessary to gradually release the minimum necessary amount of the active ingredient from the functional agent contained in the resin. Immediately after starting use of the molded article, the active ingredient exceeds the necessary minimum amount and is temporarily released in a large amount, and the effect of the functional agent concentrates immediately after the start of use of the molded article. Inhomogeneous), therefore, there are many cases in which the effect can be expected only for a very short period after the start of use (the effect is not persistent).

Another problem is that the working environment during molding is deteriorated. Among functional agents, those that exhibit specific functions by releasing vaporized components into the air or the surrounding environment, such as fragrances and repellents (release functional agents)
When heated, the vaporization of the components is promoted and it is easy to dissipate into the atmosphere.On the other hand, resin molding involves heating, so when producing a resin molded product containing a release functional agent, The accompanying heating causes the active ingredients of the functional agent to be released in large quantities into the working environment. Therefore, for example, when a functional resin molded product is to be manufactured using a repellent made of a component such as wasabi or citrus, a large amount of components having odor and irritation to the skin are released by heating during molding. In some cases, the worker may need to wear protective glasses or a mask, or the working environment may be deteriorated to the extent that forced ventilation is required.

[0007] Further, when the functional agent to be included is organic, there is a problem that decomposition and deterioration frequently occur due to heat during molding due to low heat resistance temperature.

Further, in the conventional functional resin molded product, the surface of the molded product is excessive due to a so-called bleed-out phenomenon (a phenomenon in which a component lacking compatibility with the synthetic resin material blows out to the surface of the resin molded product). Some of them are sticky or dusted by various functional agents, and lack the sustained release property (property to gradually release the active ingredient), and many of them are not practical.

This point will be described in more detail. For example, when the functional agent is an inorganic type which is not compatible at the molecular level with a synthetic resin (organic type), the synthetic resin and the functional agent are not compatible. As shown in FIG. 5, the functional agent 102 is often distributed in a sea-island shape in the synthetic resin 101, and in such a case, the functional agents 102a and 102b located at the portions facing the surface of the molded product are Because it easily diffuses to the periphery, the functional agent is temporarily over-supplied to the surface of the molded product, resulting in the surface of the molded product becoming sticky,
Problems such as dusting occur.

Further, when the functional agent 102 is distributed in a sea-island manner in the synthetic resin 101 as shown in FIG. 5, an effect corresponding to the added amount of the functional agent can be obtained in the molded article. There is a problem that can not be. This is because, among the functional agents 102 distributed in the synthetic resin 101, the functional agent 102c and the like located in the inner layer are hermetically sealed by the surrounding resin, so that contact with the outside world is inhibited and the desired function is exhibited. This is because they are unnecessarily preserved without being able to do so.

Further, when the release functional agent is used, as described above, since the vaporization of the functional agent is promoted by the heating at the time of molding, a loss is generated by that amount and included in the obtained molded article. The amount of the functional agent is less than the initial amount added to the substrate, etc., which also means that the molded product cannot have an effect commensurate with the amount of the functional agent added. It is considered to be one of the causes.

On the other hand, if a functional agent is excessively added in advance in anticipation of a loss caused by heating during molding or a portion which does not substantially function due to being sealed in the inner layer of the resin, a molded product can be formed. Although it is possible to sufficiently exhibit the desired function, it is economically problematic to add an expensive functional agent in excess, and the load on the natural environment is large.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem in the conventional functional resin molded article, and can provide a uniform effect for a long period of time, thereby reducing the problem of deterioration of the working environment during manufacturing. It is an object of the present invention to provide a highly practical functional resin molded product which can avoid the problem and can preferably avoid the problem such as the bleed-out phenomenon.

[0014]

Means for Solving the Problems A functional resin molded article according to the present invention comprises a synthetic resin, a fibrous material, and a functional agent, and the functional agent is supported on inorganic porous fine particles. It is characterized in that it is distributed in the molded article in a state where it has been placed. The synthetic resin is preferably a thermoplastic resin, and the fibrous material is preferably at least one of waste paper, release paper, laminated paper, and wood flour. In addition, the functional resin molded article may optionally include an additive, a foaming agent, a filler, and the like, in addition to the synthetic resin, the fibrous material, and the functional agent.

Further, the functional agent is preferably a fragrance, a rust inhibitor, a repellent, an antibacterial agent, a preservative, a deodorant, or a pesticide. In addition, the inorganic porous fine particles are used in a state where the functional agent is supported, and 0.01 to 60% by weight based on the whole molded article.
It is preferable that the loading amount of the functional agent is set in the range of 1 to 500% by weight based on the inorganic porous fine particles alone. Further, the fibrous material is preferably contained in the range of 0.5 to 60% by weight (approximately 1 to 70% of the whole molded product in terms of bulk ratio) based on the whole molded product.

[0016]

Embodiments of the present invention will be described below. The functional resin molded product according to the present invention is basically,
A synthetic resin is added to the fibrous material, and a functional agent is also added in a state of being supported on the inorganic porous fine particles, which is molded into a desired shape. In addition to the release functional agents such as fragrances, rust preventives, repellents, and antibacterial agents, adsorbent functional agents such as desiccants, odor absorbers, and gas absorbers can be used.

As synthetic resins, polyolefin, vinyl acetate, EVA (ethylene-vinyl acetate copolymer), PP
Thermoplastic resins such as (polypropylene) and PE (polyethylene) can be used. However, when a releasing functional agent is used as the functional agent, a low-melting resin such as polyolefin, vinyl acetate, or EVA may be used so that the release of the functional agent due to heating during molding can be minimized. preferable. In addition, these resin materials may be used by selecting only one of the above, or may be used by selecting two or more and combining them at an appropriate mixing ratio. It may be used or collected as used waste (industrial waste).

Examples of the fibrous material include ordinary paper materials, laminated paper coated with resin, wood flour, pulverized wood,
Mineral fibers, synthetic fibers and the like can be used. In addition to waste paper and used laminated paper (release paper, etc.), scraps generated when manufacturing any product can be used. In addition, it is preferable to use a laminated paper (particularly, release paper) containing almost no moisture because the amount of gas generated during molding of a molded product can be suppressed.

Here, the method for producing a functional resin molded product according to the present embodiment will be briefly described. The functional resin molded product according to the present embodiment comprises a functional agent in a state of being supported on inorganic porous fine particles. Since it is necessary to add the functional agent to the synthetic resin, first, a method of supporting the functional agent on the inorganic porous fine particles will be described, and then the inorganic porous fine particles supporting the functional agent will be added to form a resin molded article. A method for performing the above will be described.

(1) Loading of Functional Agent on Inorganic Porous Fine Particles First, an apparatus as shown in FIG. 1 is prepared. This device is
A vacuum chamber 6 provided with an exhaust valve 4 and a leak valve 5 and a tank 7 containing a solution 9 of a functional agent are connected via an introduction valve 8, and the inside of the vacuum chamber 6 is depressurized. Thus, the solution 9 of the functional agent under normal pressure is introduced into the vacuum chamber 6 by utilizing the pressure difference, and the functional agent is carried on the inorganic porous fine particles 3 in the vacuum chamber 6. You can do it.

The step of supporting the functional agent on the inorganic porous fine particles 3 using the apparatus of FIG. 1 will be described in more detail. First, a predetermined amount of the inorganic porous fine particles 3 having a sectional structure as shown in FIG. It is housed in a flask or the like and set in the vacuum chamber 6. As shown in FIG. 2, the inorganic porous fine particles 3 are composed of a large number of inorganic powders 10 made of silicic anhydride, and a large number of voids 11 are provided between the respective inorganic powders 10. Is formed.

After the inorganic porous fine particles 3 are set in the vacuum chamber 6, the leak valve 5 and the introduction valve 8 are closed, and the exhaust valve 4 is opened to reduce the pressure in the vacuum chamber 6. The pressure in the vacuum chamber 6 is 10 to 10 ^-3 Torr
When the pressure is reduced to about r, the exhaust valve 4 is closed, the exhaust in the vacuum chamber 6 is completed, and the introduction valve 8 is opened.
At this time, since the internal pressure of the tank 7 containing the solution 9 of the functional agent is the same as the atmospheric pressure, the solution 9 of the functional agent is
The pressure difference is introduced into the vacuum chamber 6.

Since the pressure in the vacuum chamber 6 is reduced as described above, the gap 11 of the inorganic porous fine particles 3 set in the vacuum chamber 6 is also in a reduced pressure state. Therefore, the solution 9 of the functional agent introduced into the vacuum chamber 6 quickly permeates into the voids 11 of the inorganic porous fine particles 3. When the solution 9 has sufficiently penetrated into the voids 11, the leak valve 5 is opened to return the inside of the vacuum chamber 6 to the pressure before the decompression, and the inorganic porous fine particles 3 are taken out of the vacuum chamber 6. Then, if the surplus solution 9 is separated from the inorganic porous fine particles 3 by filtration or the like, the inorganic porous fine particles 3 carrying a functional agent can be obtained.

In this embodiment, as the inorganic porous fine particles 3, a non-hollow inorganic fine particle as shown in FIG. 2 is used. However, as shown in FIG. Can also be used. The inorganic porous fine particles 3 have a particle diameter of 0.1 to 300 μm and a bulk density of 0.1 to 5 μm.
It is preferable to use one having about 0 cc / g. When the hollow inorganic porous fine particles 3 as shown in FIG. 3 are used, the size of the hollow portion 12 is 2 nm to 2 nm in diameter.
It is preferable to use one having a thickness of about μm (wall thickness of about 0.05 to 150 μm).

The amount of the functional agent supported on the inorganic porous fine particles 3 is 1 to 500 per unit of the inorganic porous fine particles.
% By weight (preferably 10 to 130% by weight). If the amount of the functional agent carried is less than 1% by weight, the desired sustaining power cannot be obtained, and if it is more than 500% by weight, it becomes excessive and flows out of the inorganic porous fine particles.

(2) Molding of resin molded article First, fibrous material which has been finely pulverized using
A synthetic resin is appropriately added, and the mixture is heated and kneaded. Then, the kneaded product of the fibrous material and the synthetic resin is pelletized by extrusion. Next, the inorganic porous fine particles carrying the functional agent are dropped into (added to) the pellets by the method described above, and formed into a desired shape by injection molding, extrusion molding, inflation molding, blow molding or the like. According to such a method, it is possible to produce a functional resin molded product that exhibits a desired function by a functional agent contained therein.

Although the method for producing a functional resin molded product according to the present embodiment is generally as described above, the functional resin molded product according to the present invention is limited to those produced by the above-described production method. is not. For example, the addition of the inorganic porous fine particles carrying the functional agent may be performed before the kneaded product of the fibrous material and the synthetic resin is pelletized.

FIG. 4 shows a cross-sectional structure of the functional resin molded product 1 thus manufactured. As is clear from this figure, the functional resin molded article 1 in the present embodiment has a structure in which the inorganic porous fine particles 3 and the fibrous material 13 are almost uniformly distributed inside. Among these, the fibrous material 13 is distributed in the resin in a state where fine fibers are intertwined in a complicated manner. According to the manufacturing method as described above, the resin material cannot enter the gap between the fibers and the inside of each fiber without any gap. As a result, the inside of the resin molded product 1 becomes the fibrous material 13. The microscopic voids are stretched in a network like capillaries,
In addition, these minute gaps have a structure that leads to the outside of the resin molded product 1 from the end portion 13a of the fibrous material 13 reaching the surface of the resin molded product 1.

The functional agent carried inside the inorganic porous fine particles 3 gradually oozes out from the voids 11 formed in the inorganic porous fine particles 3 a little at a time, and furthermore, The functional agent is supplied to the fibrous material 13 distributed in the surroundings, passes through the minute gaps stretched inside the resin molded product 1 by the fibrous material 13, and finally, the functional agent gradually flows to the outside of the resin molded product 1. It is to be released to.

The synthetic resin and its additives are heated at the time of molding. However, since the functional agent is supported on the inorganic porous fine particles, the heat insulating effect at the time of molding the functional agent is obtained by its heat insulating effect. It is possible to buffer from the history, and loss and deterioration of the functional agent due to heating during molding can be prevented as much as possible.

Before the addition to the synthetic resin, the inorganic porous fine particles 3 carrying the functional agent are appropriately coated with a resin or the like, so that the openings of the voids 11 formed in the inorganic porous fine particles 3 are formed. Therefore, the amount (and speed) of the functional agent that oozes out of the inorganic porous fine particles 3 through the voids 11 and thus the amount of the functional agent released to the outside of the resin molded article 1 can be adjusted. (And speed)
Can be adjusted freely.

[0032]

As described above, the functional resin molded article according to the present invention is added to the resin material while being supported on the inorganic porous fine particles. Can be suitably protected. In addition, due to the presence of the voids of the inorganic porous fine particles and the minute voids of the fibrous material, the functional agent can be gradually released in the obtained molded article, and the effect of the functional agent can be evenly distributed over a long period of time. We can expect over a long time.

Therefore, the functional resin molded product according to the present invention can be applied to a wide range of uses. For example,
When a desiccant is selected as a functional agent and added to a resin material and molded into a tray shape, it can be used as a tray for packing dry matter such as laver, and a freshness retaining material as a functional agent. When is selected, it can be used as a packaging pack tray for fresh food such as vegetables and fresh fish.

Further, a pest repellent is selected as a functional agent, added to the resin material, formed into a sheet shape, and provided with an adhesive treatment on one side, so that it is adhered to a flowerpot, a support for cultivating vegetables, or the like. It can be used as an insect repellent sheet. Further, if a sheet is formed by adding a rust preventive agent, and the sheet is processed into a bag shape, it can be used as a rust preventive packaging material for metal products.

[Brief description of the drawings]

FIG. 1 is an explanatory view of one embodiment of a method for producing a functional resin molded product according to the present invention.

FIG. 2 is a diagram showing a cross-sectional structure of inorganic porous fine particles 3 used in the present invention.

FIG. 3 is a diagram showing a cross-sectional structure of another example of the inorganic porous fine particles 3 used in the present invention.

FIG. 4 is a diagram showing a cross-sectional structure of a functional resin molded product 1 according to the present invention.

FIG. 5 is a diagram showing a cross-sectional structure of a conventional general resin molded product.

[Explanation of symbols]

 1: resin molded article 3: inorganic porous fine particles, 4: exhaust valve, 5: leak valve, 6: vacuum chamber, 7: tank, 8: introduction valve, 9: solution of functional agent, 10: inorganic powder, 11: void portion, 12: void, 13: fibrous material, 101: synthetic resin, 102: functional agent,

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[Procedure amendment]

[Submission date] February 15, 2000 (2000.2.1
5)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 2

[Correction method] Change

[Correction contents]

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takahiro Okamoto 2-27 Dojima, Kita-ku, Osaka-shi, Osaka Tomoe Industries, Ltd. Osaka Branch (72) Inventor Shuji Okabe Kami Nishiichi, Hirano-ku, Osaka-shi, Osaka 18-18-26 Okabe Metal Co., Ltd. (72) Inventor Masaaki Mizuguchi 1-8-22 Shimoshinjo, Higashi-Yodogawa-ku, Osaka-shi, Osaka F-term in Suzuki Yushi Kogyo Co., Ltd.F-term (reference) AD01 AD03 AE08 AE22 AF53 BA01 BB05 BB06 BB09 4J002 AB012 BB011 BB031 BB061 BB121 BF021 BF031 DJ006 FA042 FA096 FB086 FB296 FD010 FD187 FD207 FD320

Claims (5)

[Claims] 1. A functional resin comprising a synthetic resin, a fibrous material, and a functional agent, wherein the functional agent is supported on inorganic porous fine particles. Molding. 2. The functional resin molded article according to claim 1, wherein the fibrous material is at least one of waste paper, release paper, laminated paper, and wood flour. 3. The method according to claim 1, wherein the functional agent is a fragrance, a rust inhibitor, a repellent,
The functional resin molded article according to claim 1 or 2, which is an antibacterial agent, a preservative, a deodorant, or an agricultural chemical. 4. The composition of the functional resin molded product is such that the synthetic resin is 20 to 99.49% by weight based on the whole molded product, and the inorganic porous fine particles are 0.01% in a state where the functional agent is supported. ~
The functional resin molded article according to any one of claims 1 to 3, wherein 60% by weight and fibrous material are contained in the range of 0.5 to 60% by weight. 5. The method according to claim 1, wherein the functional agent is carried on the inorganic porous fine particles in a range of 1 to 500% by weight based on the inorganic porous fine particles alone. A functional resin molded product according to the above item.