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Preparation method of mixed-crystal titanium dioxide modified PVA mildew-proof fresh-keeping film

A technology of titanium dioxide and titanium oxide, which is applied to biocide-containing paints, anti-fouling/underwater coatings, coatings, etc., and can solve problems such as fogging, inability to meet fresh-keeping needs, and water accumulation

Inactive Publication Date: 2017-09-12
CHANGDE JINDE NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing film can play the role of packaging and has a certain fresh-keeping effect, it obviously cannot meet the fresh-keeping needs of the modern market.
And during the storage process, it is often in a state of drastic changes in temperature and humidity, and fogging and water accumulation often occur in the bag, which promotes the production and reproduction of pathogenic bacteria and causes a large number of fruits and vegetables to rot

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0039] A preparation method of PVA anti-mildew preservative film modified by mixed crystal titanium dioxide, comprising the following steps:

[0040] a1, the TiO 2 •nH 2 The molar ratio of O and KOH is 0.43, add an appropriate amount of water, grind, then heat up to 880°C in a muffle furnace, keep warm for 2h, and slowly cool to room temperature to obtain the mesophase K 6 Ti 2 o 7 ;

[0041] a2, then the dispersed intermediate product K 6 Ti 2 o 7 Put it into a small amount of water, let it stand for 1-2 days, then put the obtained hydrated product into an appropriate amount of water for stirring, continuously add 0.5mol / L hydrochloric acid, and use a pH meter to control the pH value of the solution to 2.5;

[0042] a3. After the system is stable and reaches equilibrium, the intermediate product is filtered out with suction, washed with water until neutral and dried to constant weight to obtain the product titanic acid, and then sintered to 900°C at a speed of 10°C min...

Embodiment example 2

[0048] b1, the TiO 2 •nH 2 The molar ratio of O and KOH is 0.4, add an appropriate amount of water, grind, then heat up to 880°C in a muffle furnace, keep warm for 2h, and slowly cool to room temperature to obtain the mesophase K 6 Ti 2 o 7 ;

[0049] b2, then the dispersed intermediate product K 6 Ti 2 o 7 Put it into a small amount of water, let it stand for 1-2 days, then put the obtained hydrated product into an appropriate amount of water for stirring, continuously add 0.5mol / L hydrochloric acid dropwise, and use a pH meter to control the pH value of the solution to 2.0;

[0050] b3. After the system is stable and reaches equilibrium, the intermediate product is filtered out with suction, washed with water to neutrality and dried to constant weight to obtain the product titanic acid, and then sintered to 800°C at a speed of 10°C min-1 in a muffle furnace , keep warm for 2h, and slowly cool to room temperature to obtain the anatase-rutile mixed crystal titanium oxid...

Embodiment example 3

[0056] A preparation method of PVA anti-mildew preservative film modified by mixed crystal titanium dioxide, comprising the following steps:

[0057] c1, the TiO 2 •nH 2 The molar ratio of O and KOH is 0.6, add an appropriate amount of water, grind, then heat up to 900°C in a muffle furnace, keep warm for 2h, and slowly cool to room temperature to obtain the mesophase K 6 Ti 2 o 7 ;

[0058] c2, then the dispersed intermediate product K 6 Ti 2 o 7 Put it into a small amount of water, let it stand for 2 days, then put the obtained hydrated product into an appropriate amount of water for stirring, continuously add 0.5mol / L hydrochloric acid dropwise, and use a pH meter to control the pH value of the solution to 3.0;

[0059] c3. After the system is stable and reaches equilibrium, the intermediate product is filtered out with suction, washed with water to neutrality and dried to constant weight to obtain the product titanic acid, and then sintered to 1200°C at a speed of 1...

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Abstract

The invention discloses a preparation method of a mixed-crystal titanium dioxide modified PVA mildew-proof fresh-keeping film. The preparation method includes the steps of A1, weighing anatase-rutile type mixed-crystal titanium oxide powder, adding into an acetone solution containing a silane coupling agent, and evenly stirring; A2, drying the mixed liquid above in a vacuum drying oven of 60-80 DEG C for 24-48 hours to obtain powder particles with the particle size being 200-300 meshes; A3, preparing PVA sol with solid mass fraction being 10%, heating with a water bath of 95-100 DEG C until solid completely melts, and the adding the power particles obtained in the steps A2; A4, coating a PE thin film subjected to prime coating with the PVA sol obtained in the step A3 to obtain the mildew-proof fresh-keeping film, wherein the PE thin film is 8-10 micrometers in thickness. The tensile strength and the elongation at break of the mixed-crystal titanium dioxide modified PVA mildew-proof fresh-keeping film are better than those of a conventional fresh-keeping film, and the moisture permeability and the sterilizing and mildew-proof performance of the mixed-crystal titanium dioxide modified PVA mildew-proof fresh-keeping film are better than those of the conventional fresh-keeping film.

Description

technical field [0001] The invention relates to the technical field of preparation of anti-mildew preservative film, in particular to a preparation method of PVA anti-mildew preservative film modified by mixed crystal titanium dioxide. Background technique [0002] Preservative film is currently the most widely used packaging material for fresh fruits and vegetables. It is transparent and can be used to see the condition of the packaged product at a glance; it can moisturize and reduce the moisture loss of the product and improve its freshness; it has good sealing performance and can protect the product from contamination. . Although the existing films can play the role of packaging and have a certain fresh-keeping effect, they obviously cannot meet the fresh-keeping needs of the modern market. And in the storage process, it is often in a state of drastic changes in temperature and humidity. Fogging and water accumulation often occur in the bag, which promotes the product...

Claims

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Application Information

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IPC IPC(8): C08J7/04C09D129/04C09D5/14C08L23/06
CPCC08J7/0427C08J2323/06C08J2429/04C08K9/04C08K2003/2241C09D5/14C09D129/04
Inventor 田璐陈华章杰
Owner CHANGDE JINDE NEW MATERIAL TECH CO LTD