Bacteriostatic and fungistatic additive in masterbatch for application in plastics, and method for producing same

a technology of additives and fungi, applied in the field of additives, can solve the problems of inferior dispersibility, undesirable effects, and inability to prevent microorganisms from settling back, and achieve the effect of improving the integration properties and preventing degradation

Inactive Publication Date: 2016-08-11
SERVICIOS IND PENOLES S A DE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0034]The additive is a concentrated masterbatch in pellet form, prepared starting from a mixture of concentrates of zinc oxide and silver oxide obtained from a paste of nanometric zinc oxide which is given a surface treatment to improve their properties for integration into the final compound and to prevent its degradation, as well as a paste of nanometric metallic silver.
[0035]Due to the characteristics acquired by the additive as a result of the manufacturing process, the additive may be incorporated directly and homogeneously to the plastic material to which it is added, ensuring the same activity across the exposed surface, and being integrated ho

Problems solved by technology

These products are used to clean surfaces that may have germs on them, which offers some protection benefits but do not prevent microbes to settle back.
The antimicrobial silver compound in contact with the polymeric article may interact with it producing undesirable effects, such as darkening due to reduction to metallic silver.
Furthermore, it is recognized that zeolite powders tend to agglomerate and are inferior in dispersibility when mixed with resins.
The difficulty to find such materials commercially lies mainly in the high cost of the quantities of metal and/or metal compounds necessary to achieve the desired purpose, particularly in the case

Method used

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  • Bacteriostatic and fungistatic additive in masterbatch for application in plastics, and method for producing same
  • Bacteriostatic and fungistatic additive in masterbatch for application in plastics, and method for producing same
  • Bacteriostatic and fungistatic additive in masterbatch for application in plastics, and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of Raw Material Concentrates

[0063]A. Preparation of the silver concentrate in low density polyethylene (LDPE).

[0064]To prepare the silver concentrate an intensive mixing equipment for polymers is used.[0065]Step 1. Enter into the equipment 167 g of silver paste with 80% by weight of solids,[0066]Step 2. Add 1200 g of virgin LDPE resin to obtain a concentrate of about 10% by weight of silver,[0067]Step 3. Mix for 8 minutes ensuring the complete integration into the molten polymer,[0068]Step 4. Homogenize the material obtained by means of a twin screw extruder,[0069]Step 5. Check final concentration, which should be about 10% by weight.

[0070]B. Preparation of the ZnO Concentrate in Low Density Polyethylene (LDPE)

[0071]It is started from a paste of zinc oxide at 50% by weight solids with the above described specifications.

[0072]Once the dough is obtained its integration into the polymer is carried out in an equipment for intensive mixing of polymers, performing the followin...

example 2

Preparation of 5 kg of the Concentrate of ZnO / Ag° LDPE at 5% for a ZnO / Ag Ratio of 90:10.

[0077]a. Mix 225 g of zinc oxide concentrate with 25 g of silver concentrate, prepared according to Example 1,[0078]b. For a final application of 1 kg of LDPE, 40 g of the mixture from the previous step will be added, diluting with 960 g of LDPE for final application in a twin screw extruder for the additive ZnO / Ag° to be 0.2% by weight of the final mixture.

example 3

Preparation of 5 kg of the Concentrate of ZnO / Aq° LDPE at 1% for a ZnO / Aq Ratio of 90:10.

[0079]a. Mix 45 g of the zinc oxide concentrate with 5 g of silver concentrate, prepared according to Example 1,[0080]b. For a final application of 1 kg at 0.05%, 50 g of concentrate will be added, diluting 950 g of the final compound for a final application in a twin screw extruder for the additive ZnO / Ag° to be at 0.05%.

[0081]It is to be noted that the above examples produce an additive in a ZnO / Ag° ratio of 90:10, which is the recommended ratio for best results in typical applications, however combinations up to 10:90 ZnO / Ag can be used passing through the intermediate ranges for different performances and applications.

[0082]Results

[0083]The additive obtained according to the described method was tested on several polymers, in accordance with Examples 2 and 3, which were exposed to three bacterial strains and four fungal strains with the results shown below.

[0084]In Table 3 are shown in summa...

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PUM

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Abstract

Disclosed is an additive of ZnO/Ag° with a bacteriostatic and fungistatic action in the production of plastic items based on resins such as polypropylene, polyethylene, polystyrene, high-impact polystyrene, polyurethanes, etc., especially for producing automotive products, electrical appliances, products for washing, for storing and conducting water, for packaging, etc. The additive is prepared by mixing nanometric silver concentrates and pre-treated zinc oxide with a polymer resin compatible with the target application as a vehicle, obtaining pellets of the additive in a ratio of between 10:90 and 90:10 in weight of ZnO/Ag° : vehicle. The additive is biologically effective at a ratio in the final product of between 0.01 and 0.5 wt. % of polymer mixture and does not have any negative effects on other properties of the polymer, such as the whiteness thereof.

Description

TECHNICAL FIELD[0001]This invention refers to additives used in the plastics industry, particularly refers to an additive concentrate in the form of masterbatch with bacteriostatic and fungistatic activity manufactured by mixing a concentrate of nanoparticles of zinc oxide and a concentrate of metallic silver nanoparticles and a method for its manufactures.BACKGROUND OF THE INVENTION[0002]People have been concerned for a long time to protect themselves from germs that can cause disease, infections and growth of bacteria and moulds. The manufacture of articles with antimicrobial additives helps to increase the protection against these microbes. Many products containing antimicrobial additives exist, including soaps, lotions and disinfectants and environment refreshing products. These products are used to clean surfaces that may have germs on them, which offers some protection benefits but do not prevent microbes to settle back. In the field of health care, medical devices and dental ...

Claims

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Application Information

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IPC IPC(8): A01N59/16A01N25/10
CPCA01N59/20A01N25/10B82Y30/00A01N59/16A01N25/12
Inventor BENAVIDES PEREZ, RICARDOBOCANEGRA ROJAS, JOSE GERTRUDISTENA SALCIDO, CARLOS SERGIO
Owner SERVICIOS IND PENOLES S A DE
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