KR102204904B1 - Manufacturing method of antibacterial plastics molded articles for parts of air cleaner - Google Patents

Abstract

The present invention relates to a method of manufacturing an antibacterial plastic molded body for an air purifier part, wherein an inorganic antibacterial agent consisting of silver (Ag), copper sulfide (CuS) and zinc oxide (ZnO) is mixed with 5 to 10% by weight of a raw material resin. Preparing a masterbatch, preparing an antibacterial plastic material by mixing any one or more resins of polypropylene and acrylonitrile-butadiene-styrene copolymer (ABS) and the antibacterial masterbatch, preparing the antibacterial plastic material It characterized in that it comprises the step of manufacturing a molded article by injection molding.

Description

Manufacturing method of antibacterial plastic molded body for air purifier parts. {MANUFACTURING METHOD OF ANTIBACTERIAL PLASTICS MOLDED ARTICLES FOR PARTS OF AIR CLEANER}

The present invention relates to a method for manufacturing an antibacterial plastic molded article for an air purifier part, and more particularly, to a manufacturing method for manufacturing a molded article constituting the housing and internal parts of an air purifier using an antibacterial masterbatch containing an inorganic antibacterial agent. .

For products that require antibacterial performance among plastic products, plastic molded bodies are manufactured using antibacterial master batches.

Republic of Korea Patent Publication No. 10-2011-0029712 is manufacturing a storage tank for a water purifier using an antibacterial master batch, the antibacterial master batch is made of PE, PP, PA, PS, PLA, ABS, SAN, and combinations thereof. Organic antibacterial agents of chlorine-based, quinoline-based, or phosphorus-based compounds based on 100 parts by weight of one type of polymer selected from the group; Inorganic antimicrobial agents of silver or copper; And 0.1 to 20 parts by weight of one antimicrobial agent selected from the group consisting of a combination thereof.

In addition, Korean Patent Publication No. 10-1045274 uses antibacterial masterbatch to provide kitchen appliances such as tableware, cutting boards, water bottles, baby products such as baby bottles and toys, various synthetic fiber products, and construction materials such as cases or interior and exterior materials for electronic products. A molded article that can be applied to the like is manufactured, and in this case, the antibacterial function is improved by including a silica nanotube antibacterial agent in which silver nanoparticles are adsorbed in the antibacterial masterbatch.

In addition, Korean Patent Publication No. 10-0565671 manufactures an installation stand for a drum washing machine using an antibacterial plastic composition comprising 99.0-99.7% by weight of polypropylene and 0.3-1.0% by weight of an antimicrobial masterbatch. As an antimicrobial masterbatch, a composition comprising 89% by weight of polypropylene, 5% by weight of isothiazoline-based compound, 5% by weight of inorganic composite compound, and 1% by weight of silver compound is applied.

The antibacterial masterbatch of these prior arts manufactures various molded articles by dispersing a metal catalyst having excellent antibacterial properties in the masterbatch.

On the other hand, since a general air purifier only functions to filter fine dust using a filter, the housing and internal parts other than the filter are exposed to pathogens or fine dust as it is. To solve this problem, the air purifier There is a need for a technology to impart antibacterial performance to the component itself.

In addition, in the case of a vehicle air purifier, only the air purifying function of fine dust through a filter is included, so it is not possible to prevent the propagation of bacteria or mold contained in the air in the housing and parts of the air purifier. Due to its characteristics, air purifiers as described above may cause diseases caused by harmful pathogens.

In the case of imparting antibacterial performance to the housing and internal parts of the air purifier, it is necessary to apply an antibacterial masterbatch that can maintain antibacterial ability for a long period of time while having excellent processability of plastic molded body and excellent impact resistance and compatibility. Unlike the masterbatch, it is necessary to develop an antibacterial masterbatch and an antibacterial plastic material suitable for this.

Korean Patent Application Publication No. 10-2011-0029712 Korean Patent Publication No. 10-1045274 Korean Patent Publication No. 10-0565671 Korean Patent Publication No. 10-1334283 Korean Patent Application Publication No. 10-2017-0005949

The present invention has been devised in view of the prior art as described above, and an object thereof is to provide an antibacterial master batch for manufacturing an antibacterial plastic molded body for air purifier parts and a method of manufacturing a plastic molded body using the same.

In addition, it is an object of the present invention to provide a method of manufacturing a plastic molded body capable of manufacturing not only a cover of an air purifier, but also internal parts of various shapes into a molded body by using an antibacterial masterbatch having excellent physical properties and antibacterial performance.

The method of manufacturing an antibacterial plastic molded article for an air purifier part of the present invention for solving the above problems includes 5 to 10 inorganic antibacterial agents consisting of silver (Ag), copper sulfide (CuS), and zinc oxide (ZnO) for the raw resin. A step of preparing an antibacterial masterbatch by mixing in wt%, preparing an antibacterial plastic material by mixing one or more resins of polypropylene and acrylonitrile-butadiene-styrene copolymer (ABS) and the antibacterial masterbatch, It characterized in that it comprises the step of manufacturing a molded body by injection molding the antibacterial plastic material.

At this time, the antibacterial plastic material may include 10 to 20% by weight of the antibacterial masterbatch.

In addition, the raw material resin may be any one or more of polyethylene, polypropylene, polycarbonate, polyamide, and acrylonitrile-butadiene-styrene copolymer.

The manufacturing method of a plastic molded article according to the present invention uses an antibacterial master batch having excellent physical properties and antibacterial performance for manufacturing an antibacterial plastic molded article for air purifier parts, so that not only the cover of the air purifier, but also internal parts of various shapes can be manufactured into a molded article. Has an effect.

Hereinafter, the present invention will be described in more detail. The terms or words used in the specification and claims should not be construed as being limited to their usual or dictionary meanings, and the inventor may appropriately define the concept of terms in order to describe his own invention in the best way. It should be interpreted as a meaning and concept consistent with the technical idea of the present invention based on the principle that there is.

The method of manufacturing an antibacterial plastic molded article for an air purifier part according to the present invention is manufactured by manufacturing an antibacterial masterbatch, mixing the antibacterial masterbatch and resin to prepare an antibacterial plastic material, and then molding it, which is harmless to the human body and is semi-permanently It is possible to provide an antibacterial plastic material exhibiting antibacterial performance.

The manufacturing method of the antibacterial plastic molded article is to prepare an antibacterial masterbatch by mixing 5 to 10% by weight of an inorganic antibacterial agent consisting of silver (Ag), copper sulfide (CuS) and zinc oxide (ZnO) with respect to a raw resin, and polypropylene and After preparing an antibacterial plastic material by mixing any one or more resins of acrylonitrile-butadiene-styrene copolymer (ABS) and the antibacterial masterbatch, the antibacterial plastic material is injection-molded to prepare a molded body. Can be manufactured.

The raw material resin may be any resin constituting the antibacterial masterbatch, but in consideration of compatibility while being suitable for application to parts for air purifiers, polyethylene, polypropylene, polycarbonate, polyamide, acrylonitrile-butadiene -It is preferable that it is any one or more of a styrene copolymer.

When the raw material resin and the inorganic antimicrobial agent are added to an extruder and forcibly kneaded, an antibacterial masterbatch is produced.If the amount of the inorganic antibacterial agent is used in an excessively small amount outside the range of 5 to 10% by weight, the antibacterial effect is insufficient, and too much If used, it is preferable to be used in the above range because compatibility decreases in the manufacturing process of the antibacterial plastic, resulting in a problem of deteriorating durability.

In the present invention, silver (Ag), copper sulfide (CuS), and zinc oxide (ZnO) are mixed and used as the inorganic antibacterial agent.

Silver (Ag) is widely used as an inorganic antibacterial agent, and is known as a material that exhibits an antibacterial effect by being added to plastic molded articles or master batches.

In addition, Korean Patent Publication No. 10-1334283 manufactures antibacterial plastics using a master batch containing zinc oxide, and Korean Patent Publication No. 10-2017-0005949 selects Crimbazole and CPC (Cetyl Pyridinium Chloride). It is known about the antibacterial performance of zinc oxide, such as using zinc oxide as a mixed additive in order to increase thermal stability in an antimicrobial masterbatch containing an antimicrobial agent containing at least one of the groups to be antibacterial and to sustain antibacterial properties.

However, when only the silver or the zinc oxide was applied, there was a problem in the persistence of the antibacterial performance, and when mixed with copper sulfide, the persistence of the antibacterial performance was found to be greatly improved.

Specifically, when the inorganic antimicrobial agent is mixed in the master batch in an amount of 5 to 10% by weight, it is preferable to mix the copper sulfide and zinc oxide in a weight ratio of 1:1 to 3:1 and mix it with silver. , If the content of copper sulfide is too small, there is no difference in the effect from the master batch using only zinc oxide, and even if the content of copper sulfide is too high, the antibacterial persistence is improved but the antibacterial effect is decreased.

In addition, the silver; and the mixture of the copper sulfide and zinc oxide are preferably mixed in a weight ratio of 2:1 to 5:1. It was found to further increase the antibacterial effect of silver in the above content range.

The silver, copper sulfide and zinc oxide are preferably 1 to 50 μm in size particles. This is a size in consideration of compatibility between inorganic particles and resin, and it is preferable to use inorganic particles of the above particle size because if the particles are too large, the moldability is deteriorated, and even if the particles are too small, economic efficiency is reduced.

The antibacterial masterbatch is mixed with a resin composition to prepare a plastic material, and any one or more resins of polypropylene and acrylonitrile-butadiene-styrene copolymer (ABS) and the antibacterial masterbatch are mixed to prepare an antibacterial plastic material After manufacturing, by injection molding the antibacterial plastic material, various types of molded articles suitable as parts of an air purifier can be manufactured.

In addition, when manufacturing the antibacterial plastic material, if necessary, impact modifiers, compatibilizers, fillers, antistatic agents, lubricants, pigments, dyes, plasticizers, processing aids, release agents, slip agents, anti-blocking agents, stabilizers, ultraviolet absorbers , Viscosity modifiers, waxes, any one or more additives may be added.

When preparing the antibacterial plastic material, it is preferable that the antibacterial masterbatch contains 10 to 20% by weight based on the total plastic material. When the content of the antimicrobial masterbatch is too small, the antibacterial effect cannot be sufficiently exhibited, and when the content of the antimicrobial masterbatch is too large, there is a problem that the durability decreases due to poor moldability during injection molding, so it is suitable to be blended within the above range.

In order to confirm the long-term persistence of the antibacterial performance of the antimicrobial plastic material according to the manufacturing method of the present invention, as shown in Table 1, an antibacterial masterbatch was prepared by mixing an inorganic antibacterial agent with polypropylene, and the plastic material was prepared by mixing it with a resin composition. Then, a 20×20 cm test piece was prepared by injection molding. The test bacteria solution was incubated for 2 hours at (35±1)°C and RH 90% for each test piece, and the bacterial solution was collected and the number of E. coli and Staphylococcus aureus was measured, and the percentage reduction of the strain relative to the initial number of strains was measured. The results are shown in Table 2.

Antibacterial masterbatch PP
(Part by weight) ABS
(Part by weight) Master batch
(Part by weight) Antibacterial
(weight%) CuS:ZnO
(Weight ratio) Ag:Cu,Zn mixture
(Weight ratio) Example 1 8 2:1 3:1 90 - 10 Example 2 8 2:1 3:1 - 90 10 Example 3 8 2:1 4:1 85 - 15 Example 4 8 2:1 5:1 - 85 15 Comparative Example 1 8 2:1 4:1 95 5 Comparative Example 2 8 2:1 4:1 - 95 5 Comparative Example 3 - - - 100 - - Comparative Example 4 - - - - 100 - Comparative Example 5 8 0:1 3:1 85 - 15 Comparative Example 6 8 0.5:1 3:1 85 - 15 Comparative Example 7 8 1:0 3:1 85 - 15 Comparative Example 8 8 2:1 6:1 90 - 10

Number of initial strains (number of bacteria/ml) 1 day 30 days 120 days Coli Staphylococcus Coli Staphylococcus Coli Staphylococcus Coli Staphylococcus Example 1 1.4×10 ⁴ 1.4×10 ⁴ 99.9 99.9 99.9 99.9 99.9 99.9 Example 2 1.5×10 ⁴ 1.5×10 ⁴ 99.9 99.9 99.9 99.9 99.9 99.9 Example 3 1.3×10 ⁴ 1.5×10 ⁴ 99.9 99.9 99.9 99.9 99.9 99.9 Example 4 1.4×10 ⁴ 1.4×10 ⁴ 99.9 99.9 99.9 99.9 99.9 99.9 Comparative Example 1 1.4×10 ⁴ 1.5×10 ⁴ 98 98 98 98 94.5 95 Comparative Example 2 1.5×10 ⁴ 1.3×10 ⁴ 98 98 98 98 93 94 Comparative Example 3 1.3×10 ⁴ 1.3×10 ⁴ - - - - - - Comparative Example 4 1.5×10 ⁴ 1.5×10 ⁴ - - - - - - Comparative Example 5 1.4×10 ⁴ 1.3×10 ⁴ 99.5 99.2 98 98 95 94.5 Comparative Example 6 1.5×10 ⁴ 1.4×10 ⁴ 99.5 99 98 98 95.5 96 Comparative Example 7 1.4×10 ⁴ 1.5×10 ⁴ 98 98 95 95 91 90.5 Comparative Example 8 1.4×10 ⁴ 1.5×10 ⁴ 98.2 98 96.5 95.5 92.5 92.5

Looking at the results in Table 2, when an antibacterial plastic material is manufactured with an antibacterial masterbatch to which an antibacterial agent according to the present invention is applied, and a molded article is manufactured therefrom, the initial antibacterial performance is maintained even after 120 days. It turned out to be excellent. On the other hand, in Comparative Examples 1 and 2 where the amount of antibacterial masterbatch was relatively small, the initial antibacterial performance was slightly lower, and after 120 days, the antibacterial performance was significantly reduced. It was confirmed that it was necessary to optimize the blending amount.

In addition, in Comparative Examples 5 and 7 using only CuS or ZnO as the antimicrobial agent used when preparing the antibacterial masterbatch, and Comparative Example 6 using an antimicrobial agent containing a small amount of CuS, it was found that the long-term antibacterial performance was insufficient. It was confirmed that mixing in an appropriate ratio and containing as an antimicrobial agent is an essential element to achieve the object of the present invention.

In addition, when the mixture of CuS and ZnO is mixed in an excessively small amount with respect to Ag, it appears that the antibacterial performance decreases after 120 days. It was confirmed that it showed an increased effect.

The present invention has been described with reference to a preferred embodiment as described above, but is not limited to the above embodiment, and various modifications and variations by those of ordinary skill in the art within the scope not departing from the spirit of the present invention. Can be changed. Such modifications and variations should be viewed as falling within the scope of the present invention and the appended claims.

Claims (3)

Consisting of silver (Ag), copper sulfide (CuS) and zinc oxide (ZnO) with respect to the raw resin, the copper sulfide and zinc oxide are mixed in a weight ratio of 1:1 to 1:3, and the silver; And preparing an antimicrobial masterbatch by mixing 5 to 10% by weight of an inorganic antibacterial agent mixed in a weight ratio of 2:1 to 5:1 in the mixture of copper sulfide and zinc oxide.
Preparing an antibacterial plastic material by mixing one or more resins of polypropylene and acrylonitrile-butadiene-styrene copolymer (ABS) and the antibacterial masterbatch;
Manufacturing a molded body by injection molding the antibacterial plastic material;
Including,
The antibacterial plastic material is a method of manufacturing an antibacterial plastic molded body for air purifier parts, characterized in that it contains 10 to 20% by weight of the antibacterial master batch.
delete The method according to claim 1,
The raw material resin is polyethylene, polypropylene, polycarbonate, polyamide, acrylonitrile-butadiene-styrene copolymer, characterized in that any one or more of the method for producing an antibacterial plastic molded body for air purifier parts.