JP3535258B2 - Olefin-based insect repellent resin composition having durability and molded product thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a long-lasting olefin insect-repellent resin composition and a molded article thereof, and more specifically to a box or sink of a kitchen appliance, a housing material for electronic equipment, a vending machine. , To prevent entry of cockroaches, ants, centipedes, midges, termites, etc. into floor materials, wall materials, ceiling materials, etc.
The present invention relates to a long-lasting olefin-based insect-repellent resin composition containing a pyrethroid as a main component and a molded article thereof for preventing the entry of cuticles.

[0002]

2. Description of the Related Art At present, changes in housing styles promote the growth of mold and increase the growth of pests. Conventionally, the use of insecticide-containing aerosols, fumigants, poison baits, traps, etc. has been generally used as a countermeasure for these damages, but the effect is long-lasting and insufficient for about one year. .

As a treatment method for imparting the insect repellent durability, a method of encapsulating the insect repellent in a microcapsule to improve the durability or a method of incorporating the insect repellent into polyethylene or polypropylene is used. If the effect is sustained due to pests, flying pests, unpleasant pests, clothing pests, etc., it has the disadvantages of insufficient effect or short-lasting effect, resulting in higher costs. Was also a problem.

Further, organophosphorus insecticides have a problem in safety, and they are regarded as a problem for termites.

[0005]

Therefore, as a result of studies to solve the shortcomings of insufficient effect and short lasting effect that the conventional techniques have, as a result, a pyrethroid insect repellent is blended by combining plural kinds of olefin polymers. Then, it was found that the duration of insect repellent action against pests can be controlled, and that the repellent action of insect repellent can be obtained over a long period of time.

That is, the object of the present invention is to control the duration of insect repellent action against insect pests, to maintain the repellent action of insect repellent for a long period of time, and to have excellent weather resistance. To provide the body.

[0007]

According to the present invention, (A)
High density polyethylene or polypropylene polymer 100
Insect repellent resin composition having long lasting insect repellent action, characterized by containing 10 parts by weight of (B) 10 to 400 parts by weight of low density polyethylene , and (C) 0.3 to 15 parts by weight of pyrethroid insect repellent, A molded body made of this resin composition is provided.

[0008]

In the present invention, (A) high density polyethylene or polyethylene
100 parts by weight of the polypropylene polymer and (B) low density polymer
10 to 400 parts by weight of ethylene are combined, and (C) pyrethroid insect repellent 0.3 to 1 is added to this combination.
It is characterized by containing 5 parts by weight.

By using the combination of the above-mentioned olefin-based polymers, it is possible to control the duration of the insect-controlling action against harmful insects as compared with the case where the olefin-based polymer is used alone, and the insect-controlling action can be achieved over a long period of time. It can be maintained, and the weather resistance can be remarkably improved.

See Table 1 below. When a pyrethroid insect repellent is added to the olefin polymer alone,
Some insect repellents are extremely inferior, and some have a sufficient insect repellent action (high knockdown rate) when used for a relatively short time, but the latter also has a weather resistance test (60 ° C x 60 ° C).
After 6 months of accelerated test), the insect repellent effect is significantly reduced.

On the other hand, (A) high density polyethylene
Or a polypropylene-based polymer and (B) a low-density polyethylene
A composition containing a combination of lens and a pyrethroid insect repellent in this combination shows, of course, a sufficient insect repellent effect even when used for a relatively short time, and also exhibits almost the same repellent effect even after the weather resistance test. Therefore, it is clear that this composition has not only the long-lasting insect repellent effect but also the outstanding weather resistance.

In general, insect repellents expressed in a resin molding exhibit a repellent effect by migration,
That is, this is due to the phenomenon that the compounding agent compounded in the plasticized plastic moves from the high concentration side to the low concentration side (surface) in the compound. The degree of formation of this migration phenomenon is also related to properties such as compatibility between the plastic and the compounding agent.

High density polyethylene or polypropylene type
When a pyrethroid insect repellent is added to the polymer , migration of the insect repellent is extremely rare to show an insect repellent effect.
When a pyrethroid insect repellent is mixed with low-density polyethylene , it shows an excellent insect repellent effect in the early stage of the insect repellent action, but since the repellent repellent migrates too quickly, the insect repellent action lacks sustainability. In the present invention, when a pyrethroid insect repellent is added to the combination of these two resins, the insect repellent effect after the weather resistance test is significantly improved as compared with the case predicted from any of the above cases. It is considered that the dispersion structure controls the migration of the pyrethroid insect repellent within an optimum range, and imparts an excellent insect repellent action and its durability.

In the present invention, (A) high density polyethylene
Or polypropylene-based polymer and (B) low density polyethylene
It is also important to use ethylene with the above quantitative ratio,
If the content of the low-density polyethylene (B) is less than the above range, the level of insect repellent action itself becomes low, while if it is more than the above range, the insect repellent action tends to be less durable and weather resistant.

In the present invention, a pyrethroid insect repellent is used as an insect repellent because it has an excellent combination of safety against humans and insects and insect repellent action, and kneadability with an olefin polymer. Although it is due to the migration property, when it is blended in the above amount ratio, an excellent insect-controlling action and longevity are obtained. That is, if it is less than the above range, the insect repellent action and its persistence tend to be considerably reduced as compared with the present invention, while if it is more than the above range, the physical properties of the resin composition are deteriorated, and the effect is also particularly advantageous. Is economically disadvantageous.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, o in component (A)
The olefin-based polymer, high density polyethylene (HD
PE) or a polypropylene-based polymer is preferably used, and as the polypropylene-based polymer, a crystalline polypropylene-based polymer such as a homopolymer, a random comopolymer or a block comopolymer is used.

On the other hand, the ethylene-based polymer in the component (B)
For low density polyethylene (LDPE) (linear low density
Degree polyethylene (including LLDPE) is used.

A combination of resins having a suitable compatibility and having a dispersed structure such as a so-called sea-island or layered distribution is preferable,
For example, a combination in which the component (A) is high-density polyethylene and the component (B) is low-density polyethylene,
A combination in which the component (A) is a crystalline polypropylene polymer and the component (B) is low density polyethylene is preferable.

As the pyrethroid insect repellent (C), terraretrin, pyrethrin, allethrin, pralethrin,
Flamethrin, resmethrin, pyrethmethrin, phenothrin, permethrin, bifenthrin, cifenotrin, cyfluthrin, deltamethrin, tralomethrin,
Use of at least one pyrethroid compound selected from the group consisting of enpentrin, phthalthrin, fenvalerate, cypermethrin, cyphenothrin, etofenprox, flufenprox, fluproxyfen and silafluofen, alone or in combination of two or more. To be done.

(A) High-density polyethylene or polypropylene
(B) low-density poly based on 100 parts by weight of the ren polymer
10 to 400 parts by weight of ethylene , especially 30 to 30
It is preferable to use it in an amount of 0 parts by weight, (B) low density polyethylene
The duration of the insect repellent effect can be controlled by changing the blended weight part of len . That is, by increasing (reducing) the amount of the component (B), the transfer amount of the pyrethroid insect repellent per unit time can be increased (decreased).

The amount of (C) pyrethroid insect repellent is
0.3 to 15 parts by weight based on 100 parts by weight of (A),
In particular, it is preferable to add 0.5 to 8 parts by weight.

The method of blending the pyrethroid insect repellent includes
As long as there is a pyrethroid insect repellent when kneading the resin,
There is no particular limitation, and for example, both resins (A) and (B) may be blended simultaneously, or one resin may be blended in advance. Of course, it is also possible to prepare a master batch in which a pyrethroid insect repellent is mixed at a high concentration in advance, and mix and knead the master batch with an unmixed resin.

The resin composition of the present invention may optionally contain other additives such as inorganic fillers, neutralizing agents, antioxidants, ultraviolet absorbers, antistatic agents, crystal nucleating agents, pigments and dispersions. Agents, peroxides, etc. can be added.

The resin composition of the present invention is produced by extrusion molding,
Molding such as inflation molding, injection molding, blow molding, press molding, etc. is possible, such as kitchen box, sink, electronic equipment housing material, floor material, wall material, ceiling material, clothes storage case, chest, etc. It is useful as its component or member.

The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.

Example 1 30 parts by weight of high-density polyethylene (Hi-Zex 330
0F Mitsui Petrochemical) and low-density polyethylene 70 parts by weight (Mirason 12 Mitsui Petrochemical) and pyrethroid insect repellent (Etofenprox Mitsui Toatsu Chemical)
The composition containing 1 part by weight was inflation-molded into a film having a thickness of 0.13 mm.

Example 2 50 parts by weight of high-density polyethylene (Hi-Zex 330
0F Mitsui Petrochemical) and 50 parts by weight of low-density polyethylene (Mirason 12 Mitsui Petrochemical) and pyrethroid insect repellent (Etofenprox Mitsui Toatsu Chemical)
The composition containing 1 part by weight was inflation-molded into a film having a thickness of 0.13 mm.

Example 3 70 parts by weight of high-density polyethylene (Hi-Zex 330
0F Mitsui Petrochemical Co., Ltd.) and 30 parts by weight of low-density polyethylene (Mirason 12 Mitsui Petrochemical Co., Ltd.) and pyrethroid insect repellent (Etofenprox Mitsui Toatsu Chemical Co., Ltd.)
The composition containing 1 part by weight was inflation-molded into a film having a thickness of 0.13 mm.

Example 4 50 parts by weight of high-density polyethylene (Hi-Zex 500
A composition containing 1 part by weight of 0S Mitsui Petrochemical Co., Ltd.) and 50 parts by weight of low-density polyethylene (Millason 50, manufactured by Mitsui Petrochemical Co., Ltd.) as a pyrethroid insect repellent (made by Allethrin Sumitomo Chemical Co., Ltd.) is extruded into a 1.0 mm thick sheet. did.

Example 5 50 parts by weight of crystalline polypropylene (Hypol F3
01 Mitsui Petrochemical) and 50 parts by weight of low-density polyethylene (Millason 50, manufactured by Mitsui Petrochemical) and 1 part by weight of a pyrethroid insect repellent (Allethrin made by Sumitomo Chemical) are extruded into a sheet having a thickness of 1.0 mm. did.

Comparative Example 1 100 parts by weight of crystalline polypropylene (HIPOL F
A film having a thickness of 0.13 mm was inflation-molded with a composition containing 301 parts by weight of Mitsui Petrochemical Co., Ltd. and 1 part by weight of a pyrethroid insect repellent (Etofenprox, manufactured by Mitsui Toatsu Chemical).

Comparative Example 2 A film having a thickness of 0.13 mm was formed by using a composition containing 100 parts by weight of low-density polyethylene (Mirason 50 manufactured by Mitsui Petrochemical Co., Ltd.) and 1 part by weight of a pyrethroid insect repellent (Etofenprox Mitsui Toatsu Chemical Co., Inc.). Inflation molded.

Comparative Example 3 100 parts by weight of low-density polyethylene (Mirason 50 manufactured by Mitsui Petrochemical Co., Ltd.) and a pyrethroid insect repellent (Allethrin)
A composition containing 1 part by weight of Sumitomo Chemical Co., Ltd. was extruded into a sheet having a thickness of 1.0 mm.

Comparative Example 4 50 parts by weight of high-density polyethylene (Hi-Zex 330
A film having a thickness of 0.13 mm was inflation-molded with a composition containing 0F Mitsui Petrochemical Co., Ltd.) and 50 parts by weight of low-density polyethylene (Mirason 12 Mitsui Petrochemical Co., Ltd.).

* Efficacy against cockroaches The sheet and film obtained in Examples 1 to 5 and Comparative Examples 1 to 4 were evaluated for insect repellent effect. The method was to examine the time-dependent change in knockdown rate when 5 male and female German cockroaches were placed in a beaker of 9 cm in diameter on the sheet and film, and were directly contacted. The test was carried out on a test piece immediately after manufacture and subjected to weathering treatment at 60 ° C. for 6 months. The results are shown in Table 1.

[0036]

From the results of the comparative example, it is known that crystalline polypropylene has a low initial effect, does not change much in effect even after weathering, and has no practical effect.
Furthermore, in the case of low density polyethylene, it is known that the initial effect is high but the durability is short. On the other hand, in the examples, it was found that the initial effect was high and the practical effect was obtained even after the weathering treatment, and the sustainability was high. further,
It was found that the sustainability can be controlled depending on the application by changing the ratio of the olefin polymer.

[0038]

[Table 1]

[0039]

According to the present invention, (A) high density polyethylene
100 parts by weight of len or polypropylene polymer ,
When (B) low density polyethylene is combined with 10 to 400 parts by weight, and (C) pyrethroid insect repellent is contained in an amount of 0.3 to 15 parts by weight, the olefin polymer is used alone. In comparison, the duration of insect repellent action against pests can be controlled, the insect repellent action can be maintained over a long period of time, and the weather resistance can be significantly improved.

Claims (2)

(57) [Claims] 1. (A) High-density polyethylene or polypropylene
100 parts by weight of pyrene polymer , (B) low density polyethylene
Down 10 to 400 parts by weight, and (C) insect-controlling resin composition having sustained repellent action characterized by containing a pyrethroid insecticide 0.3 to 15 parts by weight. 2. An insect-repellent resin molding capable of controlling the duration of insect-repellent action, comprising the composition according to claim 1.