KR100196561B1 - A process for preparing antibacterial polymer - Google Patents

Abstract

In the present invention, 5 to 30% by weight of an inorganic antimicrobial agent is added to the polymer resin, followed by primary mixing, dispersing with a stirrer, and mixing in a melt extruder during the spinning process to prepare a master batch, and then the chip to the final resin. It is a method for producing an antimicrobial polymer, characterized in that the addition of 0.3 to 1% by weight.

Since the polymer containing the inorganic antimicrobial agent according to the present invention has excellent particle molecular properties and antimicrobial properties and its antimicrobial property is persistent, polymer products produced by the method of the present invention, such as bottles, films, sheets, etc., have excellent and continuous antimicrobial properties. Productivity can be satisfied at the same time.

Description

Manufacturing method of antimicrobial polymer

The present invention relates to a method for producing an antimicrobial polymer, and more particularly, to a method for producing a polymer having excellent particle molecular and antimicrobial properties by adding an antimicrobial agent of inorganic particles.

Microorganisms such as molds and bacteria in our living environment can reproduce in textile products and plastic products, and may have harmful effects on the human body, and may cause deterioration and staining of polymer materials. There is also giving.

Until now, research on the applicability of antimicrobial materials has been conducted, and some of them have been put to practical use. For example, antimicrobial ceramic materials are known to have a harmful effect on the human body, while the metal ions replace the various metal ions in the ceramic material to play a role in eradicating bacteria or fungi. Currently, zeolite and calcium phosphate are mainly used as antimicrobial ceramic materials. In particular, by adding them to polyester fibers to give antimicrobial properties, they are widely used in acupuncture, interior products, and industrial materials.

In Japanese Patent Publications No. 47-2512 and Japanese Patent Laid-Open Nos. 49-61950, inorganic and organic antimicrobial agents are described. Inorganic antimicrobial agents are easily eluted with metal ions, and thus hardly obtain a continuous antimicrobial effect.

In addition, antimicrobial compounds include organic mercury compounds and organic tin compounds. Although quaternary ammonium, which has been found to be toxic to humans and has high safety, has been noted, organic antimicrobials decompose at temperatures of 200 to 300 ° C. It causes a decrease in antimicrobial effect.

Thus, the present inventors earnestly studied to obtain an antimicrobial agent that solves the above problems without affecting the physical properties of the polymer and to produce a polymer having excellent antimicrobial properties and product properties.

An object of the present invention is to provide a polymer excellent in antibacterial properties and productability.

Another object of the present invention is to provide an antimicrobial polymer having excellent particle dispersibility and exhibiting continuous antimicrobial properties.

It is also an object of the present invention to provide a method for producing an antimicrobial polymer according to the above object.

Hereinafter, the present invention will be described in detail.

In the present invention, 5 to 30% by weight of an inorganic antimicrobial agent is added to the polymer resin, followed by primary mixing, dispersing with a stirrer, and mixing in a melt extruder during the spinning process to prepare a master batch chip, and then the chip is added to the final resin. It is a method for producing an antimicrobial polymer, characterized in that the addition of 0.3 to 1% by weight.

Hereinafter, the present invention will be described in more detail.

According to the present invention, a predetermined amount of a polymer to be used and an inorganic antimicrobial agent are first mixed in a homomixer, dispersed using a stirrer, and mixed in a melt compressor by a screw feeder connected to an application extruder to prepare a master batch chip. Thereafter, a predetermined amount of the master batch chip prepared above is added to prepare a synthetic resin having excellent particle dispersibility and antibacterial properties.

Inorganic antibacterial agents according to the present invention include potassium phosphate or zeolite substituted with copper, silver or zirconium ions, zirconium phosphate silver ions, zinc zeolite and the like.

The inorganic antimicrobial master batch chip prepared as described above preferably uses 0.3 to 1% by weight with respect to the final resin, but less than 0.3% by weight of the antimicrobial effect is slightly weaker, less than 0.1% by weight, 1 When used in excess of weight percent, mechanical and physical properties are deteriorated, workability is poor and there is no economic advantage.

Since the polymer containing the inorganic antimicrobial agent according to the present invention has excellent particle molecular properties and antimicrobial properties and its antimicrobial property is persistent, polymer products produced by the method of the present invention, such as bottles, films, sheets, etc., have excellent and continuous antimicrobial properties. Productivity can be satisfied at the same time.

Hereinafter, the present invention will be described in detail with reference to Examples.

[Antibacterial Test Method]

E. coli was used to test the antimicrobial effect by the test standard AA TCC-100 test method.

After inoculating the culture bacteria in agar medium and incubated for 24 hours at 37 ℃ to the test specimen (0.1 to 0.5 mm thick film) prepared according to the present invention, a certain amount of liquid is added to the bacteria from the test specimen The number of bacteria remaining in the liquid containing the test group and the control group (produced in the same manner as the test specimen except the inorganic antimicrobial agent) was determined by calculating the percentage reduction of the bacteria.

Judgment criteria: over 95%: excellent

90-95%: Medium

Less than 90%: Poor

[Dispersibility Evaluation Method]

A master batch chip was prepared by adding an inorganic particle, which is an antimicrobial agent, to a polycarbonate in a weight ratio, and a polycarbonate master batch chip containing the antimicrobial agent thus prepared was added at 0.3 and 0.5 1 wt% to the final resin to prepare a film at 280 ° C. After that, the number of aggregated particles of 10 µm or more was counted with a phase contrast microscope at a predetermined size (15 × 15 mm), and converted into pieces / mg to evaluate dispersibility according to the following criteria.

Excellent (○): 0 to 3.9

Normal (△): 4 to 6.9

Poor (×): 7.0 or more

Example 1

100 g of silver phosphate substituted potassium phosphate and 2 kg of polycarbonate (TRIREX 3022, average molecular weight 22,000) were first mixed, dispersed using a stirrer, and mixed in a melt extruder using a screw feeder connected to a melt extruder. % Master batch chips were prepared. 0.3, .05, and 1% by weight of the obtained master batch chip was added to the final resin to prepare each test piece, and the test piece was melt-injected at 280 DEG C by placing a slit die in a brabender and having a thickness of 0.2 mm. It was made into a film.

Antimicrobial test and dispersibility evaluation were performed about the obtained film, and the result is shown in Table 1.

Example 2

A film was prepared in the same manner as in Example 1, except that potassium phosphate substituted with copper ions was used as the inorganic antibacterial agent. The antimicrobial test and dispersibility evaluation were carried out and the results are shown in Table 1.

Example 3

Test specimens were prepared in the same manner as in Example 1, except that zeolite substituted with silver ions was used as the inorganic antibacterial agent. The antimicrobial test and dispersibility evaluation were carried out and the results are shown in Table 1.

Example 4

Test specimens were prepared in the same manner as in Example 1 except that zeolite substituted with copper ions was used as the inorganic antibacterial agent. The antimicrobial test and dispersibility evaluation were carried out and the results are shown in Table 1.

Example 5

Test specimens were prepared in the same manner as in Example 1, except that zirconia phosphate was used as the inorganic antibacterial agent. The antimicrobial test and dispersibility evaluation were carried out and the results are shown in Table 1.

Comparative Example 1

A test piece was prepared in the same manner as in Example 1, except that 0.1% by weight and 5% by weight of a silver ions-substituted potassium phosphate inorganic antimicrobial agent was prepared and used. The antimicrobial test and dispersibility were carried out and the results are shown in Table 1.

Comparative Example 2

A test piece was prepared in the same manner as in Example 1, except that 0.1 wt% and 5 wt% of zirconium phosphate were prepared and used, respectively. The antimicrobial test and dispersibility evaluation were carried out and the results are shown in Table 1.

Claims (1)

5-30 wt% of inorganic antimicrobial agents such as potassium phosphate or zeolite substituted with copper, silver or zirconium ions are added to the polymer resin, firstly mixed, dispersed with a stirrer, and mixed in a melt extruder during the spinning process to a master batch. After manufacturing the chip, the method of producing an antimicrobial polymer, characterized in that the addition of 0.3 to 1% by weight relative to the final resin.