Polyvinyl alcohol radical composite coating fresh keeping packaging material nano TiO2 functional modification method

A polyvinyl alcohol-based, coating film preservation technology, applied in the direction of coating, etc., can solve the problems of low antibacterial preservation function, poor water resistance and moisture resistance, etc., to improve antibacterial preservation function, water resistance and film-forming barrier performance, The effect of reducing moisture permeability

Active Publication Date: 2013-04-10
CHANGSHU YIHAO FOOD PACKAGING MATERIAL TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to: aim at the problems that polyvinyl alcohol-based composite materials are used as coating film fresh-keeping packaging, which have poor water resistance and moisture resistance and low antibacterial and fresh-keeping functionality, and provide a new packaging method using nano-TiO 2 Combined with nano-SiO 2 Method for functional modification of polyvinyl alcohol-based composite coating film fresh-keeping packaging materials

Method used

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  • Polyvinyl alcohol radical composite coating fresh keeping packaging material nano TiO2 functional modification method
  • Polyvinyl alcohol radical composite coating fresh keeping packaging material nano TiO2 functional modification method
  • Polyvinyl alcohol radical composite coating fresh keeping packaging material nano TiO2 functional modification method

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Embodiment 1

[0023] Nano TiO 2 , SiO 2 Add to the polyvinyl alcohol aqueous solution with a concentration of 50 g / L and stir and place it in an ultrasonic water bath. Ultrasound for 20 minutes at a power density of 65W / L. Nano-TiO 2 And SiO 2 After being uniformly dispersed in the polyvinyl alcohol solution, the mixed solution is placed in the reaction kettle and heated until the temperature reaches 90°C, and the reaction is stirred for 5.5 hours, and then stearic acid-alcohol (ethanol content of 90-99%) at the same temperature (90°C) is added. ) The mixed solution, the mass-volume ratio of stearic acid to alcohol is 1:20, the addition amount of stearic acid solution is 4.5g / L according to the mass-volume ratio of the aqueous solution of polyvinyl alcohol, and glutaraldehyde is added at the same time, and it is delivered at constant temperature. Joint reaction for 50 minutes, then stir and cool to room temperature to prepare a new nano-modified composite coating film material.

[0024] Nano Ti...

Embodiment 2

[0029] 0.4 g / L nano TiO 2 , 0.3 g / L nano SiO 2 Add to the concentration of 30g / L H2O After stirring in the aqueous solution of polyvinyl alcohol, it is placed in an ultrasonic water bath and ultrasonicated for 15 minutes at a power density of 58W / L. Nano-TiO 2 And SiO 2 After being evenly dispersed in the polyvinyl alcohol solution, the mixed solution is placed in the reaction kettle and heated until the temperature reaches 85°C, and the reaction is stirred for 5 hours, and then stearic acid-alcohol (95% ethanol content) at the same temperature (85°C) is added and mixed Solution, the mass-volume ratio of stearic acid to alcohol is 1:15, the addition amount of stearic acid solution is 4g / L according to the mass-volume ratio of polyvinyl alcohol aqueous solution, and 4g / l glutaraldehyde is added at the same time. Cross-linking reaction for 40 minutes, then stir and cool to room temperature to prepare a new nano-modified composite coating material. Test the film-forming performance ...

Embodiment 3

[0031] 0.4 g / L nano TiO 2 , 0.3 g / L SiO 2 Add to the concentration of 80g / L H2O After stirring in the aqueous solution of polyvinyl alcohol, it is placed in an ultrasonic water bath, and the power density is 70W / L for 25min. Nano-TiO 2 And SiO 2 After being uniformly dispersed in the polyvinyl alcohol solution, the mixed solution is placed in the reaction kettle and heated until the temperature reaches 95°C with constant temperature stirring for 6 hours, and then stearic acid-alcohol (ethanol content of 90-99%) at the same temperature (95°C) is added ) The mixed solution, the mass-volume ratio of stearic acid to alcohol is 1:25, and the added amount of stearic acid solution is 5g / L according to the mass-volume ratio of the aqueous solution of polyvinyl alcohol. At the same time, add 4g / l of glutaraldehyde, cross-linking reaction at 95℃ for 60min, then stir and cool to room temperature to prepare new nano-modified composite coating material, test the new packaging of polyvinyl alc...

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Abstract

The invention relates to a polyvinyl alcohol radical composite coating fresh keeping packaging material nano TiO2 functional modification method, which comprises the following steps: adding nano TiO2 and SiO2 into a polyvinyl alcohol aqueous solution and stirring; carrying out ultrasonic mixing on a mixed liquor; placing the mixed solution in a reaction kettle after ultrasonic; heating, stirring and reacting at constant temperature; adding stearic acid-alcohol mixed solution and glutaraldehyde with the same temperature and stirring; and carrying out cross-linking reaction at a constant temperature; stirring and cooling to a room temperature after reaction, so as to prepare into a nano composite coating new material. With the adoption of the polyvinyl alcohol radical composite coating fresh keeping packaging material nano TiO2 functional modification method, the nano TiO2 is adopted to modify a polyvinyl alcohol radical composite coating fresh keeping packaging material; the new material film formation moisture permeability is obviously reduced, and anti-bacteria fresh keeping performance of the packaging material is obviously improved.

Description

technical field [0001] The invention relates to a nano-modified composite coating film packaging material for food packaging and a preparation process thereof, and belongs to the technical field of composite food packaging materials, in particular to a polyvinyl alcohol-based composite coating film fresh-keeping packaging material nano-TiO 2 Functional Modification Methods. Background technique [0002] The fresh-keeping method of coating film packaging is a new hotspot in the research and development of food packaging storage and preservation in recent years, and its packaging preservation effect mainly depends on the selection of film materials and film-forming methods. Polyvinyl alcohol (PVA) is easy to form a film and degrade, and has good hygiene and safety, so it is widely used in food packaging, but its hydrophilic property makes it have higher moisture permeability after film formation, which affects its application effect on food packaging; research PVA and other m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D129/04C09D129/14C09D7/12C08F16/06C08F8/28
Inventor 章建浩王佳媚尹月玲
Owner CHANGSHU YIHAO FOOD PACKAGING MATERIAL TECH
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