JPH09323904A - Antimicrobial composition for synthetic resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a new complex compound for incorporating a synthetic resin without causing the decomposition even when added to the synthetic resin during the processing thereof and without affecting the synthetic resin by bonding a specific inorganic material through a silane coupling agent to an antimicrobial agent. SOLUTION: This antimicrobial composition for a synthetic resin is obtained by bonding an inorganic material having active hydroxyl groups in the molecule such as kaolin clay, a silicon compound or bentonite through a silane coupling agent having an alkoxysilyl group and epoxy group to an antimicrobial agent having a functional group capable of chemically bonding to the epoxy group. The complex compound is used by incorporation thereof in the synthetic resin when thermally melting the resin and is capable of improving the heat resistance and further water resistance and sustaining antimicrobial efficacies for a long period. The antimicrobial agent (complex compound) is preferably blended in an amount of 0.01-3.0wt.%, especially 0.05-2.0wt.% based on the synthetic resin.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a novel composite compound obtained by binding an inorganic material having an active hydroxyl group such as kaolin clay, a silicon compound or bentonite and an antibacterial agent through a silane coupling agent to a synthetic resin. The present invention relates to an antibacterial composition for synthetic resin, which is added at the time of heating and melting.

[0002]

2. Description of the Related Art Compounds used as antibacterial agents for synthetic resins include phenolic compounds and quaternary ammonium salts,
Many compounds such as salicylic acid derivatives, guanidines, and thiazoles have been used. However, these compounds have insufficient long-term stability and water resistance when used in a natural environment. Further, it was often impossible to knead these antibacterial agents into a synthetic resin material at the time of heating and melting because of heat resistance.

[0003]

The compound used in the synthetic resin as an antibacterial agent must have sufficient resistance to heat in addition to the natural environment such as air and ultraviolet rays. Particularly for synthetic fibers that require long-term antibacterial properties, a kneading method at the time of melting can be considered as an effective addition method to the fibers, but in order to do this, excellent heat resistance is required, It must be a compound that does not affect the washing resistance, weather resistance and resin material.

[0004]

[Means for Solving the Problems] As conditions for an antibacterial agent for adding a synthetic resin, sufficient consideration must be given to water resistance, heat resistance, and compatibility with a resin. There are few antibacterial agents currently on the market that have all of the above conditions, and there are drawbacks such as good water resistance but poor heat resistance, and good heat resistance but water solubility. Often. This is because these were not developed for kneading synthetic resins.

The present invention was completed by discovering a new composite compound for kneading a synthetic resin by chemically bonding an antibacterial agent having excellent antibacterial efficacy and stability but poor water resistance and heat resistance to an inorganic material. did.

In order for the antibacterial agent of the present invention to exert antibacterial properties on a synthetic resin, 0.01 to 3.0% by weight based on the resin
(Hereinafter, all% are shown by weight).
The object is achieved by directly kneading 2.0% or adding as a masterbatch.

In addition to the above, the present invention is directed to other germicides, fungicides,
An insect repellent, a deodorant-reactive substance, and a flavoring agent, a coloring agent, a UV inhibitor, an antioxidant and the like can be used in combination. Further, a plasticizer, calcium carbonate, magnesium carbonate and other mineral substances can be used when kneading into plastic.

[0008]

[Function] As an antibacterial agent used in a thermoplastic resin, obtained by chemically reacting an antibacterial compound with a compound obtained by reacting one or more kinds of inorganic substances having an active hydroxyl group with a silane coupling agent. The complex compound described above is used. This compound is used as an antibacterial agent that is kneaded when the resin is heated and melted, but since it improves not only heat resistance but also water resistance, the antibacterial effect is long-lasting even when used in synthetic resins. You can

To use the antibacterial agent of the present invention in a synthetic resin, 0.01 to 3.0% based on the resin, preferably 0.0
By directly kneading 5 to 2.0% or by adding it as a masterbatch, it is possible to impart excellent antibacterial properties to the resin without any change in coloration, discoloration and physical properties of the resin. Moreover, almost no alteration of the antibacterial agent is observed.

[0010]

EXAMPLES Next, the present invention will be specifically described by way of examples. However, these are only examples, and the scope of the invention is
It is not limited by these.

Example 1 (1) Method for producing silane-treated antibacterial agent A kaolin clay (Burges # 1) was added to a Henschel mixer.
0: 1 kg of Shiraishi Calcium Co., Ltd. was charged, 50 g of a silane coupling agent (KBM403: Shin-Etsu Chemical Co., Ltd.) and 1 g of water were added with stirring, and the mixture was stirred at 600 rpm for about 2 minutes. When the stirring was completed, it was completely dried at about 110 ° C. to prepare a silanized kaolin clay.

The silane-treated kaolin clay produced above was charged into a Henschel mixer again, and stirred at the same rotation speed, while being stirred at the same number of revolutions, with an aqueous solution of polyhexamethylene biguanidine hydrochloride (50% aq: BG-1 manufactured by Sanyo Chemical Industry Co., Ltd.). 100 g), and stir until uniform (about 2 minutes). After completion of stirring, it is thoroughly dried at about 110 ° C.

(2) Preparation of antibacterial test plate 1% of the silanized antibacterial agent obtained above was added to molten nylon resin.
An addition and kneading plate was prepared. Processing temperature: 22
0-255 ° C

(3) Antibacterial test Test method: Pressure contact method (according to Tokyo Metropolitan Food Hygiene Association Mochinaga method) Test bacteria: Staphylococcus aureu
s (Staphylococcus aureus)

(4) Table 1 shows the test results.

[Table 1]

(5) Water resistance test of antibacterial plate After immersing the plate prepared in (2) in running water of 1 l / min for 7 days, the antibacterial test was conducted again. The results are shown in Table 2.
Shown in

[Table 2]

Example 2 (1) Method for producing silane-treated antibacterial agent A kaolin clay (Burges # 1) was added to a Henschel mixer.
0: 1 kg of Shiraishi Calcium Co., Ltd. was charged, 50 g of a silane coupling agent (KBM403: Shin-Etsu Chemical Co., Ltd.) and 1 g of water were added with stirring, and the mixture was stirred at 600 rpm for about 2 minutes. When the stirring was completed, it was completely dried at about 110 ° C. to prepare a silanized kaolin clay.

The silane-treated kaolin clay prepared above was charged into a Henschel mixer again and stirred at the same number of revolutions while maintaining an aqueous PCMX solution (10% aq:
Add 100 g of Mitsubishi Gas Chemical Co., Ltd. product alkaline solution and stir until uniform (about 2 minutes). After completion of stirring, it is thoroughly dried at about 110 ° C.

(2) Preparation of antibacterial test plate 2% of the silane-treated antibacterial agent obtained above was added to polyethylene resin.
An addition and kneading plate was prepared. Processing temperature: 150
~ 170 ° C

(3) Antibacterial test Test method: Pressure adhesion method (according to Tokyo Metropolitan Food Hygiene Association Mochiaga method) Test bacteria: Staphylococcus aureu
s (Staphylococcus aureus) (4) Test results are shown in Table 3.

[Table 3]

(5) Heat resistance test of antibacterial plate The polyethylene compound prepared in (2) was heated at 240 ° C.
After staying for about 10 minutes, a plate was prepared and the antibacterial test was conducted again. The results are shown in Table 4.

[Table 4]

[0022]

As an antibacterial agent to be added to a synthetic resin, one or more compounds having an active hydroxyl group, which are inorganic materials, are reacted with a silane coupling agent, and the compound obtained is further reacted with the antibacterial agent. The composite compound thus obtained can be an antibacterial chemical substance having water resistance and heat resistance.

Claims (2)

[Claims] 1. A function of chemically bonding a compound obtained by reacting one or more inorganic materials having an active hydroxyl group in the molecule with a silane coupling agent having an alkoxysilyl group and an epoxy group, and an epoxy group. An antibacterial composition for synthetic resins, characterized in that a composite compound obtained by reacting an antibacterial agent having a group is an antibacterial chemical substance having water resistance and heat resistance. 2. The antibacterial composition for synthetic resin according to claim 1, wherein the antibacterial composition for a synthetic resin is obtained by a reaction with a silane coupling agent whose reactive group with an organic substance is an epoxy group.