JP2002370246A - Additive-containing foamed resin molded object and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an additive-containing foamed resin molded object capable of reutilizing a waste material or the like, excellent in mechanical strength and having desired properties such as insecticidal properties, anti-proof properties or the like. SOLUTION: A first foaming resin containing plastic additives and prefoamed resin particles containing no plastic additives are mixed and heated to be molded. A mixing ratio of the first foaming resin and the prefoamed resin particles is set so that the first foaming resin is 5-50 pts.wt. and the prefoamed resin particles are 95-50 pts.wt.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an additive-containing foamed resin molded article having properties such as insect repellency, termite control, heat resistance, fire resistance, flame retardancy, coloring, antistatic properties, and conductivity, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, in order to incorporate properties such as insect repellency and termite control into a foamed resin molded article, a plastic additive exhibiting these properties has been incorporated into the foamed resin molded article. For example, JP-A-10-36549,
JP-A-3-202528 discloses a technique in which a termiticide is contained in a foamed resin molded product. For example, a foamed resin molded article containing a termiticide is used for building materials and the like. When the foamed resin molded article containing the plastic additive is used for the purpose of use and becomes a waste material, it is disposed of by landfill, incineration or the like.

[0003]

However, the recent increase in waste, shrinkage of landfills, air pollution, and high interest in recycling have made disposal of the foamed resin difficult. Therefore, a method of reusing the foamed resin has been studied, but it is difficult to maintain the mechanical strength and desired properties such as insect repellent and termites contained by the plastic additive after reusing. Was.

SUMMARY OF THE INVENTION In view of the conventional problems, the present invention provides a foamed resin-containing additive-containing molded article which can reuse waste materials and the like, has excellent mechanical strength, and has desired properties such as insect repellency and termite control. It is intended to provide a manufacturing method thereof.

[0005]

According to a first aspect of the present invention, a first foamed resin containing a plastic additive and pre-foamed resin particles not containing the plastic additive are mixed, heated, and molded. A method for producing an additive-containing foamed resin molded article, characterized by the following (claim 1).

Next, the operation and effect of the first invention will be described.
First, as the first foamed resin, any foamed resin containing a desired plastic additive can be used. Therefore, when the foamed resin molded article containing the plastic additive is used as, for example, a building interior material, and is discarded by dismantling or the like, it can be reused as the first foamed resin molded article. Further, when the above-described foamed resin containing a plastic additive is used for a building interior material or the like, an offcut generated as a surplus dimension can be used as the first foamed resin.

Further, the foamed resin molded article containing the above-mentioned plastic additive, itself, can be used as a first foamed resin in the form of a strip as it is new. Therefore, the foamed resin containing the plastic additive can be reused, and the utilization of resources and prevention of air pollution can be promoted.

[0008] These first foamed resins are, for example, 0.1 c
in the strip of m ³ or more in size, then mixed with the pre-expanded resin particles, placed in the mold, heated with steam or the like,
Form into the desired shape. The surface of the pre-expanded resin particles is melted by heating and fused with the first foamed resin. Therefore, the first foamed resin and the pre-foamed resin particles are firmly joined, and are excellent in mechanical strength such as compressive strength and bending strength. Further, the additive-containing foamed resin molded article produced thereby has desired properties, such as insect repellent and termite, contained in the first foamed resin.

Further, according to the first aspect of the present invention, in manufacturing the additive-containing foamed resin molded article, no special apparatus is required, and the same apparatus as used in the molding process of the foamed resin molded article can be used. Therefore, an additive-containing foamed resin molded article having desired properties such as insect repellent and termite control can be produced economically and easily.

Therefore, according to the first aspect of the present invention, a method for producing an additive-containing foamed resin molded article having desired properties such as insect repellent, termite repellency, excellent mechanical strength, and reuse of waste materials can be achieved. Can be provided.

[0011] The second invention of the present application is characterized in that a first foamed resin containing a plastic additive and a second foamed resin not containing the plastic additive are mixed and molded, and the first foamed resin is mixed with the first foamed resin. The resin and the second foamed resin are an additive-containing foamed resin molded article characterized by being fused to each other (claim 7).

Next, the operation and effect of the second invention will be described.
The additive-containing foamed resin molded article according to the second invention comprises the first foamed resin and the second foamed resin, and both are fused to each other. Therefore, the additive-containing foamed resin molded article is excellent also in the mechanical strength. In addition, the additive-containing foamed resin molded article has desired properties, such as insect repellent and termite, contained in the first foamed resin. Also,
As described in the first aspect, the foamed resin containing the plastic additive can be reused.

Therefore, according to the second aspect of the present invention, there is provided an additive-containing foamed resin molded article which can reuse waste materials and the like, has excellent mechanical strength, and has desired properties such as insect repellency and termite control. be able to.

[0014]

Next, an embodiment of the present invention will be described. As a method for producing the additive-containing foam resin molded article, for example, mixing a first foamed resin which is chopped into polyhedron 1 cm ^3, and a pre-expanded resin particles free of plastic additives. And this mixture
For example, it is introduced into a mold having a fine gap into which steam can be introduced. Then, the mixture is heated and molded to obtain the additive-containing foamed resin molded article.

As the foaming resin used for the first foaming resin, for example, polystyrene foaming resin, polyethylene foaming resin, polypropylene foaming resin, polymethyl methacrylate foaming resin, urethane foaming resin, isocyanurate foaming resin, Melamine-based foamed resins, phenol-based foamed resins, and copolymer foamed resins thereof can be used. The foamed resin contains a plastic additive having desired properties such as insect repellent and termite control.

The first foamed resin may be any foamed resin molded article such as a foamed resin molded article having closed cells, a foamed resin molded article having open cells, and a foamed resin molded article having closed cells and open cells. However, it can be used.

The expansion ratio of the first foamed resin may be any ratio. When the first foamed resin is a styrene-based foamed resin, the ratio is preferably 5 to 120 times. If it is less than 5 times, it is difficult to cut into polyhedral strips, and if it exceeds 120 times, shrinkage may occur during molding.

Further, as the plastic additive,
Some have properties such as insect repellency, termite control, heat resistance, flame retardancy, coloring, antistatic, and conductivity. For example, as insect repellents, insect repellents containing termite repellents and termite repellent plastics, pyrethroid-like and systemic drugs such as silafluofen, etofen block, flufen block, permethrin, bifenthrin, tralomethrin, chlorpyrifos, phoxime, pyridafenthion, tetra Organophosphorus drugs such as chlorvinphos, fenitrothion, propetanphos; carbamate drugs such as fenobcarb and carbamate; drugs having a chloropyridylmethyl group such as fipronil, acetamiprid and imidacloprid;
Copper / arsenic compound drugs, chlornaphthalene drugs, arsenic compounds such as sodium arsenate, lead arsenate, and barium acid arsenate, fluoride compounds such as lead fluoride, barium fluoride, sodium silicofluoride, copper compounds, dinitro Boron compounds such as orthocresol, tributyltin oxide, borate, etc., titanium compounds such as titanium oxide, hinokitiol,
Examples include creosote oil, triazine-based drugs, metal salts of naphthenic acid such as copper naphthenate, organic tin compounds, inorganic fluorides of phenols, and mixtures of P-chlorometaxylal and 3,6 dichloropyrazine. In addition, any action such as a contact poison, a poison, a respiratory poison, and a repellent termite may be used.

Further, not only one kind but also two or more kinds of plastic additives such as insect repellents and termite repellents can be used. When the additive-containing foamed resin molded article is used as a heat insulating or heat insulating material for a building, it is preferable to use a borate, a pyrethroid-like or systemic agent, imidacloprid, or the like as an insect repellent or an anti-termite. These are suitable for buildings because of their low toxicity.

As the first foamed resin, as described above, in addition to the waste material containing the plastic additive,
It is also possible to reuse a new foamed resin containing a plastic additive, surplus dimension scraps, defective molding, and the like.

As a method of shredding the first foamed resin into small pieces, for example, a method of crushing using a crusher, a hot wire,
There is a method of cutting with a knife, a slicer, or the like.

Examples of the expandable resin used for the pre-expanded resin particles containing no plastic additive include polystyrene-based foamed resin, polyethylene-based foamed resin, polypropylene-based foamed resin, polymethylmethacrylate-based foamed resin, and urethane-based foamed resin. A foamed resin, an isocyanurate-based foamed resin, a melamine-based foamed resin, a phenol-based foamed resin, a copolymer foamed resin thereof, and the like can be used. The pre-expanded resin particles are preferably made of the same material as the first expanded resin. In this case, since both are easily fused, uniform mechanical strength can be given to the additive-containing foamed resin molded article after molding.

As the pre-expanded resin particles, for example, pre-expanded resin particles composed of closed cells, pre-expanded resin particles having open cells, and pre-expanded resin particles having closed cells and open cells can be used.

The expansion ratio of the pre-expanded resin particles may be any ratio. When the pre-expanded resin particles are styrene-based pre-expanded resin particles, the expansion ratio is preferably 5 to 120 times.
If it is less than 5 times, there is a possibility that uneven foaming may occur.
If it exceeds 120 times, shrinkage may occur.
Particularly preferably, the pre-expanded resin particles have substantially the same expansion ratio as the first expanded resin. In this case, the additive-containing foamed resin molded article after molding has a quality stabilizing effect.

Next, a preferred embodiment of the first invention will be described. The mixing ratio of the first foamed resin and the pre-expanded resin particles is preferably 5 to 50 parts by weight for the first foamed resin and 95 to 50 parts by weight for the pre-expanded resin particles. . If the amount of the first foamed resin is less than 5 parts by weight, desired properties such as insect repellent and termite control may not be sufficiently contained in the molded article containing the additive after molding. If the first foamed resin exceeds 50 parts by weight, the mechanical strength of the additive-containing foamed resin molded article after molding may be reduced.

The first foamed resin is 0.1 cm ³
It is preferable that the strip has the above volume (claim 3). If it is less than 0.1 cm ³ , the mechanical strength of the molded article containing the additive after the molding may be reduced, and the desired properties such as insect repellent and termite control may be insufficient. Note that the upper limit of the volume of the strip is preferably 64 cm ³ or less from the viewpoint of uniform mixing with the pre-expanded resin particles.

The strip is preferably a polyhedron. In this case, since the first foamed resin is a polyhedron, the first foamed resin and the pre-foamed resin particles are fused on multiple faces. for that reason,
Particularly, the mechanical strength is further improved. The polyhedron includes a hexahedron, an octahedron, a dodecahedron, and the like.

The plastic additive is preferably one or more selected from insect repellents, termite repellents, heat-resistant materials, refractory materials, flame retardants, coloring agents, antistatic agents, and conductive agents. (Claim 5). In this case, properties corresponding to the plastic additive can be imparted to the additive-containing foamed resin molded article.

It is preferable that the first foamed resin is a polystyrene foamed resin containing the plastic additive. In this case, since a polystyrene-based foamed resin is used in particular, a resin having high mechanical strength and heat insulation can be obtained.

Next, a preferred embodiment of the second invention will be described. The second foamed resin includes, for example, the pre-foamed resin particles. Next, the additive-containing foamed resin molded article is characterized in that the first foamed resin is 5 to 50 parts by weight,
It is preferable that the second foamed resin comprises 95 to 50 parts by weight (claim 8). If the amount of the first foamed resin is less than 5 parts by weight, desired properties such as insect repellent and termite control may not be sufficiently exhibited. On the other hand, if the first foamed resin exceeds 50 parts by weight, mechanical strength may be reduced.

The first foamed resin is 0.1 cm ³
It is preferable that the strip has the above volume (claim 9). In this case, it is the same as the third aspect, and the same effect can be obtained.

Preferably, the strip is a polyhedron. In this case, it is the same as the fourth aspect, and the same effect can be obtained.

The plastic additive is preferably one or more selected from insect repellents, termite repellents, heat-resistant materials, refractory materials, flame retardants, coloring agents, antistatic agents, and conductive agents. (Claim 11). In this case, it is the same as the fifth aspect, and the same effect can be obtained.

The first foamed resin is preferably a polystyrene foamed resin containing the plastic additive. In this case, it is the same as the above-described claim 6, and the same effect can be obtained.

[0035]

EXAMPLES Examples 1 to 4 according to the present invention will be described in comparison with Comparative Example 1. (Example 1) Polystyrene foam resin (manufactured by Mitsubishi Chemical Foam Plastic Co., Ltd., Styropol, JF20)
To the 50-fold foamed resin molded article of 0), disodium 8-borate tetrahydrate, which is a plastic additive as an anti-termite material, was added to 0.1 times.
A first foamed resin containing 5% by weight of a plastic additive was prepared.

Using a hot wire cutter, the first foamed resin was cut into hexahedrons having a size of 1 cm (length) × 1 cm (width) × 2 cm (height) to obtain strips of the first foamed resin having a size of 2 cm ³ . .

Next, the first foamed resin 10, 20, 30
Parts by weight and polystyrene pre-expanded resin particles (Mitsubishi Chemical Foam Plastic Co., Ltd., Styropol, JF
200), and 90, 80, and 70 parts by weight of the pre-expanded resin particles of VS-20005V-MC
Introduced to S block molding machine (Daisen Industries Co., Ltd., block molding machine). Then, the mixture was heated with steam having a steam pressure of 55 kPa, then cooled and molded. This contained disodium 8-borate,
An additive-containing foamed resin molded article was obtained.

From the above additive-containing foamed resin molded article, a length of 10
A sample having a size of cm × 10 cm × 2.5 cm in thickness was cut out and used as a sample for a 5% compressive strength test. Similarly, 7.5 cm long x 30 cm wide x 2.5 cm thick
A sample having a size of was cut out and used as a sample for a bending strength test and a density measurement.

Using each of these samples, JIS-A-
A 5% compressive strength test, a flexural strength test, and a density measurement were performed according to the measurement method specified in 9511. The results are shown in Table 1.

Further, from the above-mentioned additive-containing foamed resin molded article containing disodium 8-borate, a length of 10 cm × width of 1 cm was obtained.
A sample having a size of 0 cm × 2.5 cm in thickness was cut out and subjected to a termite damage test.

That is, first, the weight (B0) of the above-mentioned termite damage test sample was measured with a weighing device. This sample was placed in a glass container with a lid of 20 cm in diameter and 5 cm in height, into which 150 house termites and 15 soldiers of termites were put, and saturated saline solution was put therein, and the lid was put.

Then, the glass container was placed at 25 ° C. ± 2 ° C.
Installed in a constant temperature room with humidity of 80% ± 10%,
Left for a week. The sample weight (B1) after standing was measured with a weighing device. And the decrease amount (B2 = B0-B1)
And the reduction rate (100 × (B0−B1) / B0) were determined. In addition, the state of the damage was observed. Table 2 and Table 3 show the results.
It was shown to.

Example 2 The size of the strip of the first foamed resin shown in Example 1 was 2 cm long × 2 cm wide × 2 cm high.
Was changed to 8 cm ³ , and a first foamed resin similar to that of Example 1 was obtained except for the above. Using the first foamed resin, an additive-containing foamed resin molded article was manufactured in the same manner as in Example 1, and the same measurement as in Example 1 was performed. The results are shown in Tables 1 to 3.

Example 3 The content of disodium 8-borate contained in the first foamed resin shown in Example 1 was 5% by weight.
, And a first foamed resin similar to that of Example 1 was obtained.
Using the first foamed resin, an additive-containing foamed resin molded article was manufactured in the same manner as in Example 1, and the same measurement as in Example 1 was performed. The results are shown in Tables 1 to 3.

Example 4 The first foamed resin containing the plastic additive shown in Example 1 was crushed by a pulverizer (KBM).
The product was crushed using a sieve having a mesh size of 6 mm to obtain an amorphous, small piece of the first foamed resin having a size of 0.11 cm ³ . Using the irregular shaped first foamed resin, the additive-containing foamed resin molded article was manufactured in the same manner as in Example 1.
The same measurement was performed. The results are shown in Tables 1 to 3.

Comparative Example 1 A 50-fold pre-expanded resin particle of polystyrene pre-expanded resin particles (Mitsubishi Chemical Foam Plastic Co., Ltd., Styropol, JF200) was used.
It was introduced into a VS-20005V-MCS block molding machine (a block molding machine manufactured by Daisen Industries Co., Ltd.). The pre-expanded resin particles were molded by heating with steam at a steam pressure of 55 kPa and then cooling. As a result, a foamed resin molded article containing no plastic additive was obtained. Next, the same sample as in Example 1 was cut out from the foamed resin molded article containing no plastic additive, and the same measurement as in Example 1 was performed. The results are shown in Tables 1 to 3.

[0047]

[Table 1]

[0048]

[Table 2]

[0049]

[Table 3]

As known from Tables 1 to 3, 0.1 c
mixed m ³ or more in the first foamed resin of shredded polyhedron prefoamed resin, additive-containing foamed resin molded body formed by heating (Examples 1-3) are molded only by prefoaming a resin, It has almost the same mechanical strength as the foamed resin molded article containing no plastic additive (Comparative Example 1). Example 1
The additive-containing foamed resin molded products of Nos. 1 to 3 have an excellent controlling effect on termites. On the other hand, even when the irregularly ground first foamed resin is mixed with the pre-foamed resin particles and molded, the obtained additive-containing foamed resin molded product (Example 4) is molded only with the pre-foamed resin. There was no significant deterioration in mechanical strength compared to the foamed resin molded product (Comparative Example 1).
It is also effective in controlling termites.

Further, as can be seen from Table 3, the foamed resin molded article containing no termiticide (Comparative Example 1) suffered great damage by termites and did not die. In contrast, Examples 1 to 4 according to the present invention
Has no or low feeding damage and high termite mortality.

As described above, according to the present example, the additive-containing foamed resin molded article having the desired properties such as insect repellent and termite-proof, as well as reusing the waste material and the like, and the same can be obtained. A manufacturing method can be provided.

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Claims (12)

[Claims] 1. A first material comprising a plastic additive.
A method for producing an additive-containing foamed resin molded article, comprising mixing a foamed resin and the pre-expanded resin particles containing no plastic additive, heating and molding. 2. The mixing ratio of the first foamed resin and the pre-expanded resin particles is 5 to 50 parts by weight of the first foamed resin and 95 to 5 parts by weight of the pre-expanded resin particles.
A method for producing an additive-containing foamed resin molded article, which is 0 parts by weight. 3. The method according to claim 1, wherein the first foamed resin is a strip having a volume of 0.1 cm ³ or more. 4. The method according to claim 3, wherein the strip is a polyhedron. 5. The method according to claim 1, wherein:
The above plastic additives are insect repellent, termite repellent, heat resistant,
A method for producing an additive-containing foamed resin molded article, which is one or more selected from a fire retardant, a flame retardant, a coloring agent, an antistatic agent, and a conductive agent. 6. The method according to claim 1, wherein:
The method for producing an additive-containing foamed resin molded article, wherein the first foamed resin is a polystyrene-based foamed resin containing the plastic additive. 7. A first composition comprising a plastic additive.
The foamed resin and the second foamed resin not containing the plastic additive are mixed and molded, and the first foamed resin and the second foamed resin are fused to each other. Agent-containing foamed resin molded article. 8. The additive-containing foamed resin molded article according to claim 7, wherein the first foamed resin comprises 5 to 50 parts by weight,
An additive-containing foamed resin molded product, wherein the second foamed resin comprises 95 to 50 parts by weight. 9. An additive-containing foamed resin molded article according to claim 7, wherein the first foamed resin is a strip having a volume of 0.1 cm ³ or more. 10. The additive-containing foamed resin molded article according to claim 9, wherein said strip is a polyhedron. 11. The plastic additive according to claim 7, wherein the plastic additive is selected from an insect repellent, a termite-controlling agent, a heat-resistant agent, a fire-retardant, a flame-retardant, a coloring agent, an antistatic agent, and a conductive agent. The additive-containing foamed resin molded article is one or more kinds of the above. 12. The additive-containing foamed resin molded article according to claim 7, wherein the first foamed resin is a polystyrene-based foamed resin containing the plastic additive. .