A polyvinyl alcohol-based composite coating film 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 poor water resistance and moisture resistance, low antibacterial preservation function, etc., to improve water resistance and film-forming barrier performance, improve antibacterial preservation function, The effect of reducing moisture permeability

Inactive Publication Date: 2015-08-12
CHANGSHU YIHAO FOOD PACKAGING MATERIAL TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A polyvinyl alcohol-based composite coating film fresh-keeping packaging material nano-tio2 functional modification method
  • A polyvinyl alcohol-based composite coating film fresh-keeping packaging material nano-tio2 functional modification method
  • A polyvinyl alcohol-based composite coating film fresh-keeping packaging material nano-tio2 functional modification method

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Experimental program
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Effect test

Embodiment 1

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

[0024] Nano-TiO 2 , SiO...

Embodiment 2

[0029] 0. 4 g / L nano-TiO 2 , 0. 3 g / L nano-SiO 2 Added to a concentration of 30g / L H2O After being stirred in an aqueous solution of polyvinyl alcohol, place it in an ultrasonic water bath, and ultrasonicate for 15 minutes under the condition of a power density of 58W / L. Nano-TiO 2 and SiO 2 After being evenly dispersed in the polyvinyl alcohol solution, the mixed solution was placed in a reactor and heated until the temperature reached 85°C and stirred at a constant temperature for 5 hours, then added stearic acid-alcohol (95% ethanol content) at the same temperature (85°C) for mixing Solution, the mass volume ratio of its stearic acid and alcohol is 1:15, and the stearic acid liquid addition amount is 4g / L according to the mass volume ratio with polyvinyl alcohol aqueous solution, adds the glutaraldehyde of 4g / l simultaneously, under constant temperature The cross-linking reaction was 40 min, then stirred and cooled to room temperature to prepare a new nano-modified compo...

Embodiment 3

[0031] 0. 4 g / L nano-TiO 2 , 0. 3 g / L SiO 2 Added to a concentration of 80g / L H2O After being stirred in an aqueous solution of polyvinyl alcohol, place it in an ultrasonic water bath, and ultrasonicate for 25 minutes under the condition of a power density of 70W / L. Nano-TiO 2 and SiO 2 After being evenly dispersed in the polyvinyl alcohol solution, the mixed solution is heated in a reactor until the temperature reaches 95°C and stirred for 6 hours, and then stearic acid-alcohol (90-99% ethanol content) is added at the same temperature (95°C) ) mixed solution, the mass volume ratio of stearic acid to alcohol is 1:25, and the amount of stearic acid liquid added is 5g / L according to the mass volume ratio of polyvinyl alcohol aqueous solution. At the same time, 4g / l glutaraldehyde was added, and the cross-linking reaction was carried out at a constant temperature of 95°C for 60 minutes, then stirred and cooled to room temperature to prepare a new nano-modified composite coatin...

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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 involves the nano -modified composite coating film packaging material and its preparation process of food packaging. It belongs to the field of composite food packaging materials technology. Specifically, it is a polyethylene alcohol -based composite coating film preservation packaging material nano TIO 2 Functional modification method. Background technique [0002] The coating film packaging method is a new hotspot for food packaging storage and preservation research and development in recent years. The packaging effect of packaging mainly depends on the composite and film formation method of film materials.Polyethylene (PVA) is easy to formation and degradation, good sanitation and safety, and a large amount of food packaging, but the hydrophilic properties make the membrane have high humidity and affect the application effect on its food packaging; researchPVA and other materials are mixed with new technologies for alternating composite and...

Claims

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Application Information

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Patent Type & Authority Patents(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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