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Method for preparing SiO2 silver-loaded mould-proof fresh-keeping packaging bag

A packaging bag and anti-mold technology, applied in the field of food packaging, to achieve the effect of inhibiting proliferation and improving stability

Inactive Publication Date: 2017-03-29
NANJING UNIV OF FINANCE & ECONOMICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on the research of nano-preservative film in rice anti-mold and fresh-keeping

Method used

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  • Method for preparing SiO2 silver-loaded mould-proof fresh-keeping packaging bag
  • Method for preparing SiO2 silver-loaded mould-proof fresh-keeping packaging bag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh 535mg silver nitrate, dissolve in 250ml ultrapure water, stir and mix. Take out 10ml of silver nitrate solution, add ultrapure water to dilute it into 100ml solution, add ammonia water dropwise under the pH meter, and adjust it into a 200ppm silver ammonia solution with ph=11.5. Weigh 0.085g of SiO 2 Nano-powder, add silver-ammonia solution, shake in a shaker for 1h. After taking it out, put it into a centrifuge and centrifuge at a speed of 18000g for 30min. After centrifugation, take out the sample, pour out the supernatant, take out the precipitate and air-dry it to get SiO 2 Silver-loaded antibacterial particles. SiO 2 160g of silver-loaded antibacterial particles is used as the core antibacterial material, mixed with attapulgite 100g, polyethylene plastic masterbatch 1000g, coupling agent 40g, etc. to make a 100μm nano-antibacterial composite film.

[0025] Through experiments on ordinary packaging bags and SiO 2 The physical properties, air permeability...

Embodiment 2

[0038] Weigh 535mg silver nitrate, dissolve in 250ml ultrapure water, stir and mix. Take out 10ml of silver nitrate solution, add ultrapure water to dilute it into 100ml solution, add ammonia water dropwise under the pH measuring instrument, and adjust it into a 200ppm silver ammonia solution with ph=10.5. Weigh 0.095g of SiO 2Nano-powder, add silver-ammonia solution, shake in a shaker for 1h. After taking it out, put it into a centrifuge and centrifuge at a speed of 18000g for 30min. After centrifugation, take out the sample, pour out the supernatant, take out the precipitate and air-dry it to get SiO 2 Silver-loaded antibacterial particles. SiO 2 Silver-loaded antibacterial particles are used as the core antibacterial material, mixed with attapulgite, polyethylene plastic masterbatch, coupling agent, etc. to make a nano-antibacterial composite film.

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Abstract

The invention belongs to the technical field of food package and discloses a method for preparing a SiO2 silver-loaded mould-proof fresh-keeping packaging bag. The method includes: taking silver and SiO2 as core antibacterial materials, and electrostatically adsorbing silver ions to surfaces of SiO2 particles to form dual-effect antibacterial SiO2 silver-loaded particles; mixing the nano antibacterial particles with attapulgite, polyethylene plastic master batch, a coupling agent and the like, and performing film blowing to obtain a nano antibacterial composite film. By addition of the dual-effect antibacterial SiO2 silver-loaded particles to the polyethylene plastic master batch which is a main material, Ag endows the fresh-keeping bags with great effects of inhibition of bacterial and fungal propagation to achieve fresh keeping and preservation functions; by the nano SiO2 particles, O2 and CO2 in the packaging bag can be regulated through silicon oxygen bonds to achieve fresh keeping and water retention effects. Mould prevention and fresh keeping of food is significant to improvement of food safety and reduction of food resource loss. The SiO2 silver-loaded mould-proof fresh-keeping packaging bag has excellent food mould-proof and fresh-keeping effects.

Description

technical field [0001] The present invention relates to a SiO 2 The invention relates to a method for preparing a silver-loaded anti-mildew and fresh-keeping packaging bag, which belongs to the technical field of food packaging. Background technique [0002] Nano-packaging materials refer to composite materials formed by dispersing nano-sized particles in flexible polymers at the molecular level. Commonly used nano-materials include metals (Ag, Zn, etc.), metal oxides (TiO 2 etc.) and inorganic polymers, commonly used high molecular polymers are polyethylene (PE), polyvinyl chloride (PVC), polyamide (PA) and so on. The physical properties, mechanical properties, air permeability, moisture permeability, stability, antibacterial properties, and freshness preservation of packaging materials added with nanoparticles have been greatly improved. In particular, nano-antibacterial agents, such as Ag, can well inhibit the growth of bacteria and fungi, and play a role in fresh-keepi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/06C08K13/06C08K9/12C08K3/08C08K3/34
CPCC08J5/18C08J2323/06C08K3/08C08K3/346C08K9/12C08K13/06C08K2003/0806C08K2201/011C08L2203/16C08L23/06
Inventor 曹崇江赵婵娟李莉王素雅杨文建胡秋辉
Owner NANJING UNIV OF FINANCE & ECONOMICS
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