KR20110072469A

KR20110072469A - A method for manufacturing antibiotic plastics with silver nano-particles infiltration

Info

Publication number: KR20110072469A
Application number: KR1020090129413A
Authority: KR
Inventors: 박영덕
Original assignee: 윤말노미
Priority date: 2009-12-21
Filing date: 2009-12-21
Publication date: 2011-06-29

Abstract

The present invention is a method for producing an antimicrobial plastic using a plastic chip and before the extrusion and injection, silver nanoparticles are deposited on the polymer resin and dried using air and a dryer at a temperature of 20 ℃ ~ 130 ℃ after the transparency or antibacterial color You can get the amazing effect of making antibacterial plastic that can be used forever and permanently.

Permanently preserves antimicrobial plastics with transparency, dark and light color products. Silver, nanoparticles [nitric acid, caustic soda, zinc oxide, bromine soda, hydrogen peroxide, plastic chip]

Description

A method for manufacturing antibiotic plastics with silver nano-particles infiltration}

The present invention deposits silver nanoparticles on a plastic chip and adjusts the temperature and air input to the dryer to change the antimicrobial properties and various colors, and the permanent one that can be used until the product is discarded after extrusion and injection of the antimicrobial plastic. It relates to a manufacturing method.

The reason for producing the antibacterial plastic is as follows. Plastic pipes, water pipes, refrigerators, air conditioners, cart handles, car seats, plastics and blenders used in daily life, hangers and children's toys, Washing machines, toothbrushes, water purifiers, difficult-to-wash commercial buckets, and stone canisters are made of antimicrobial plastics that are made of silver nano-materials during extrusion or injection.

Prior arts having the above-mentioned prior art are as follows.

The antimicrobial plastic manufacturing method (Patent No. 10-0801229) with improved silver nanoparticle deposition did not have color and did not have variety.

1. According to the antimicrobial plastic composition (Korean Patent Publication No. 1994-14561), a composition having 70-99.9% by weight of resin, 0.002-10% by weight of antibacterial agent of specific components, and 0.008-20% by weight of heat stabilizer is proposed. This composition is described as mixing antibacterial and thermal stabilizers with various resins and extruding them in an extruder to produce antimicrobial plastics.

On the other hand, silver (silver) is known as a material having a multi-function, such as antibacterial, antiseptic, anti-fungal, deodorizing, and in order to economically use the antimicrobial, deodorizing, etc., silver is fine particles, porous, such as silica, zeolite It is used through support of carriers, coating, and the like. Many antimicrobial articles have been proposed by adding such granulated silver to a polymer resin, but colloidal silver nanoparticles are agglomerated with each other to grow into micrometer-based particles to uniformly deposit silver nanoparticles. It is not easy to disperse it to ash. Therefore, you can find prior art to solve this,

2. According to the manufacturing method of the composite material of the silver nanoparticles and the polymer resin (Korean Patent Publication No. 2005-47029), the silver nanoparticle colloidal solution is introduced into the preheated polymer resin, the water is removed while rotating, and the inside of the extruder In the present invention, a method of uniformly dispersing silver nanoparticles in a polymer resin without agglomeration by kneading in an extrusion into an appropriate form has been proposed. However, the method of blending the colloidal solution itself into the polymer resin has a disadvantage in that the separation of the silver nanoparticles from the adherend cannot be prevented, that is, the coating property (deposition) is insufficient.

The present inventors carefully studied the above problems, and as a result, the silver nanoparticles were put into the plastic chip to adjust the temperature and air to produce color or colorless, thus completing the manufacturing method. In other words, in the preparation of silver nanoparticles, colorlessness and color change produced by extrusion injection-molding by mixing about 4 nanometers of particles prepared by electrolysis of a silver solution prepared by a specific step into a resin chip 1mm to 5mm thick by plastic particles. The present invention proposes a method for producing antimicrobial plastics, which surprisingly prevents the release of silver nanoparticles from the deposited plastics, thereby providing a result of permanently preserving antimicrobial properties. Accordingly, it is an object of the present invention to provide a method for penetrating and producing antimicrobial plastic silver nanoparticles that can be uniformly dispersed in a plastic resin and obtain semi-permanently antimicrobial effects. In another aspect, the present invention is to provide a method for producing antimicrobial plastic silver nanoparticles penetration excellent in adhesion with silver nanoparticles and plastic by kneading the silver nanoparticles obtained by electrolysis of the silver solution with a plastic resin.

The present invention also relates to an antimicrobial plastic that maintains an optimum antimicrobial activity for a long time obtained by the above production method.

The manufacturing method to make the product is a step of preparing a silver solution in a first step, the second step is a method of making silver nano by electrolysis and heat the silver solution and the third step is a fine polymer resin It is a step of kneading and extruding and injecting, and it is a technology that can produce permanent antimicrobial plastic that can have transparency or color.

First step: preparing silver solution for electrolyte

The silver solution as the starting electrolyte for electrolysis in the production method according to the present invention can be prepared by the method described in Patent Registration No. 0399481. Specifically, 200 g of silver granulated silver particles are put in a dissolution tank, and nitric acid is added while heating to dissolve silver, thereby obtaining a primary silver solution, which consumes 180 ml of nitric acid. In addition, 150 g of stannous chloride is dissolved in 150 ml of hydrochloric acid and synthetically stirred in the primary silver solution. In order to adjust the pH to neutral, 200 g of zinc oxide was dissolved in 500 ml of caustic soda solution (PH13), and synthesized with the stirred primary silver solution to pH 7.5 to evaporate water to obtain silver salt of powder powder.

After dissolving 200 g of silver salt in 1000 ml of water, adding 100 g of bromine soda, stirring, and then adding 3 ml of hydrogen peroxide and evaporating hydrogen peroxide while stirring for 30 minutes, the primary silver solution was oxidized and decolorized, and placed in a glass bottle and exposed to the sun for 1 hour. A small amount of brown particles precipitates and can be filtered to give a translucent silver solution for the electrolyte.

Second Step: Electrolysis Step

In order to electrolyze 1000g of the silver solution, the silver solution for the electrolyte was put in an electrolytic cell, and graphite rod (diameter 2cm, length 20cm) was applied as an anode and a cathode, respectively, and then electrolyzed at 3V and 10A for 2 hours for about 4 nanometers. The silver nanoparticles of can be obtained.

Step 3: Kneading and Extrusion

The silver nanoparticles may be kneaded and extruded at a weight ratio of 1/1000 to 3/1000 with particulate polymer resin having a diameter of up to 1 mm to 5 mm to produce an antimicrobial plastic according to the present invention.

The polymer resin that can be applied here is not limited, but polyethylene, polystyrene, polypropylene, and the like may be used, and of course, may be applied alone or in a mixture. The above limitation to the weight ratio of 1/1000 to 3/1000 is proposed as a condition for exhibiting the optimum antibacterial activity (99.9% or more).

The manufacturing method according to the present invention is a method for solving the problem that the silver nanoparticles deposited on the conventional plastic adherend is separated from the adherend during the long-term maintenance weakens the antimicrobial power, silver having a predetermined physical properties through the electrolysis To solve the conventional problems by applying nanoparticles. In addition, the adherend is adjusted to make the deposition of silver nanoparticles as small as possible, and thus the antimicrobial plastics produced are always found to exhibit a constant optimum antimicrobial activity even after long-term storage.

Look at step by step an embodiment of the present invention having the characteristics as described above.

[Step 1] Preparation of Silver Solution for Electrolyte

1st process

When 200g of silver powder to be crushed is put in a dissolution tank and heated, nitric acid is slowly added to dissolve to make a primary silver solution. 180 ml of nitric acid is consumed. In the primary silver solution, a solution of 150 g of hydrochloric acid dissolved in 150 g of stannous chloride was added and stirred.

2nd process

Dissolve 200 g of zinc oxide in 500 ml of caustic soda solution (PH13) and stir to PH7.5 while synthesizing it in the first process stirring primary silver solution.

3rd process

The semi-solid powder of the second step is evaporated while maintaining the temperature of 100 ℃ to make a powder powder.

4th process

A silver salt is prepared by adding 100 g of bromine soda to 200 g of powder powder of the third step.

5th process

Dissolving 200 g of silver salt in the 4th process in 1000 ml of water produces a silver solution of a light brown liquid. In order to decolorize and oxidize the silver solution, 3 ml of hydrogen peroxide is added and stirred for 30 minutes to evaporate hydrogen peroxide into a transparent glass bottle. Exposure for 1 hour.

6th process

A small amount of brown precipitate from the product of step 5 is filtered to produce a semi-transparent silver solution for the electrolyte.

[Second Step] Electrolysis Step of Silver Solution for Electrolyte

1000 g of the silver solution for electrolyte obtained in the first step was introduced into an electrolytic cell, and electrolyzed at 3 V and 10 A for 2 hours using a graphite rod (2 cm in diameter and 20 cm in length) as an anode and a cathode, respectively, to about 4 nanometers. Silver nanoparticles are obtained.

[Third Step] Kneading and Extrusion Step

The silver nanoparticles prepared in the second step were blended with the average polypropylene resin chip and the ABS resin chip each having an average diameter of 1 mm to 5 mm or less at a 2/1000 weight ratio, and extruded to obtain pellets.

As a result of the antibacterial activity test on the obtained antimicrobial plastic pellets, the results of [FIG. 1] (PP) and [FIG. 2] (ABS), [FIG. 3] (PE), and [FIG. 4] (PS) were obtained. According to this, the antimicrobial activity was measured to 6.0 and 6.0 for strain 1 (Staphylococcus aureus) and strain 2 (Escherichia coli) when PP was applied. Also, for each of the 2 antibacterial activity values of 3.0 to 5.6 E. coli Staphylococcus aureus, Pseudomonas aeruginosa were measured, it can be confirmed that the antibacterial plastic according to the present invention is sufficiently functional. In addition, the antimicrobial activity can be maintained almost semi-permanently unless the product prototype is destroyed.

[Effects of the Invention]

The present invention is a method for producing an antimicrobial plastic using a plastic chip and depositing silver nanoparticles in a polymer resin before extrusion and injection, dried using air and a dryer at a temperature of 20 ℃ ~ 130 ℃ after giving a transparent or antibacterial color and permanently The amazing effect of making usable antibacterial plastics

[Fig. 1] [Fig. 2] [Fig. 3] [Fig. 4] is a product that was injected after depositing and infiltrating silver nanoparticles into PP, ABS, PE, and PS chips, respectively, and is a test report of antimicrobial activity.

Claims

In the antibacterial plastic manufacturing method

[Step 1]

The silver granulated silver was added to a dissolution tank, and nitric acid was added while heating to obtain a primary silver solution. A solution obtained by dissolving first salt of chloride in hydrochloric acid was added to the primary silver solution, followed by stirring. Zinc oxide was dissolved in the ODA solution (PH 13) to make PH7.5 while synthesizing with the stirred primary silver solution to evaporate water to obtain a silver salt of powder powder, and then the silver salt was dissolved in water to form bromine soda. Step of preparing and stirring, then adding hydrogen peroxide to evaporate the hydrogen peroxide while stirring to precipitate the primary silver solution into a small amount of brown particles and to filter the silver solution for the electrolyte to obtain a semi-transparent silver solution for the electrolyte:

Injecting the silver solution into the electrolytic cell and applying a graphite rod as an anode and a cathode, respectively, electrolysis under the conditions of 3V, 10A to obtain silver nanoparticles, and mixing the silver nanoparticles with the particulate polymer resin and extruded, Antimicrobial Plastic Silver Nanoparticle Penetration and Manufacturing Method.

[To second process]

The particulate polymer resin is PP or ABS pellets having a diameter of up to 1mm ~ 5mm, antimicrobial plastic silver nanoparticles penetration and manufacturing method.

[To third process]

The compounding weight ratio of the silver nanoparticles and the particulate polymer resin is 1/1000 to 3/1000 antimicrobial plastic silver nanoparticles penetration and manufacturing method.

[4th process]

The antimicrobial plastic silver nanoparticles penetration and manufacturing method manufactured by the method of a 1st process.