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Preparation method of mildew-preventing and freshness-preserving PVA coating film

A coating film and anti-mildew technology, applied in the direction of coating, etc., can solve the problems of inappropriate selection of defoaming agent for coating barrier properties, decreased oxygen barrier properties, poor water resistance, etc., and achieves excellent oxygen barrier properties and reduced viscosity. Larger, stronger adhesion effect

Active Publication Date: 2017-08-04
常德市德源招商投资有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the following common shortcomings still exist in the prior art, that is, the PVA coating liquid is easy to absorb moisture, has poor water resistance, and the oxygen barrier property decreases under high-humidity conditions; the color of the coating liquid is yellow and opaque, and the substrate after coating The end surface of the roll is also obviously yellow, and the color will deepen as time goes on; during the coating process, due to the certain surface activity of the PVA surface, foam will be generated during the stirring or coating drying process, and the choice of defoaming agent is not suitable Defects that cause coating barrier properties

Method used

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  • Preparation method of mildew-preventing and freshness-preserving PVA coating film
  • Preparation method of mildew-preventing and freshness-preserving PVA coating film

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Preparation of hydrotalcite-like modified nanoparticles:

[0033] 1) 10g Mg(NO 3 )2·6H 2 O, Al(NO 3 )3·6H 2 O was dispersed in water and stirred at 200rpm, and the temperature was raised to 60°C; then 2mol / L NaOH aqueous solution was added dropwise to maintain the pH of the system between 10.0-11.0; Mg(NO 3 )2·6H 2 O and Al(NO 3 )3·6H 2 The molar ratio of O is 2:3;

[0034]2) Stir and age at 60°C for 6 hours, then filter, and put the obtained precipitate into a nitrogen-protected calciner for calcination, from room temperature to 400°C for calcination, the heating rate is 15°C / min, and the calcination time is 8 hours, After the calcination is completed, the temperature is naturally cooled to room temperature, and the product obtained is a hydrotalcite-like material;

[0035] 3) Take 10g of hydrotalcite-like material and disperse it in 100ml of 0.02mol / L KF aqueous solution, then add 0.32g of sodium benzotriazolyl butylphenol sulfonate, heat up to reflux and stir...

Embodiment 2

[0038] Compared with Example 1, step 3) increases the pretreatment of ultrasonic dispersion, and the calcination temperature is increased, and the rest is exactly the same as Example 1; that is, the only difference is that 10g of hydrotalcite-like material is dispersed in 100ml of 0.02mol / L Ultrasonic dispersion in KF aqueous solution at 40°C for 0.5h, then add 0.32g sodium benzotriazolyl butylphenol sulfonate, heat up to reflux and stir for 24h, cool down, filter, wash with purified water, and calcined at 660-700°C under nitrogen atmosphere Hydrotalcite-modified nanoparticle precursors.

[0039] The hydrotalcite-like modified nanoparticle scanning electron microscope SEM that embodiment 2 prepares sees figure 2

[0040] Depend on figure 1 with figure 2 It can be seen from the scanning electron microscope results that in the preparation process of the hydrotalcite-like modified nanoparticles, the preparation process of the intercalation agent KF and benzotriazolyl butylph...

Embodiment 3

[0042] The preparation of PVA / hydrotalcite-like modified nanoparticles composite liquid comprises the following steps:

[0043] 1) Take 100ml of purified water and add it to the reactor, add 12g of PVA17-99 into the water at a speed of 400rpm and stir;

[0044] 2) Then add 0.2g glycerol, 0.3g polyoxyethylene polyoxypropylene pentaerythritol ether, 0.2g hydrotalcite-like modified nanoparticles (prepared in Example 2) and heat up to 80°C, and disperse into PVA17- 99 was completely dissolved, then kept for 2 hours, and cooled to room temperature to obtain a composite solution of PVA / hydrotalcite-like modified nanoparticles.

[0045] The viscosity of the PVA / hydrotalcite-like modified nanoparticle composite liquid was tested with Zahn Cup 3# (unit: S). The measured viscosity was 37.3 after preparation at room temperature, 39.0 after 60 hours at 30°C, and 39.0 after 120 hours at 30°C. The viscosity is 41.0; the viscosity is 45.0 after being placed at 10°C for 60 hours, and the vis...

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Abstract

The invention belongs to the technical field of packaging materials and particularly relates to a preparation method of a mildew-preventing and freshness-preserving PVA coating film. The preparation method comprises the following steps: taking KF and benzotriazolyl p-phenolsulfonate as intercalation agents, entering an interlayer structure of a hydrotalcite-like material and preparing a hydrotalcite-like modified nanoparticle; then enabling the hydrotalcite-like modified nanoparticle to interact with PVA to generate PVA / hydrotalcite-like modified nanoparticle compound liquid used for coating different substrates to obtain the PVA coating film. The PVA coating film prepared by the preparation method provided by the invention has excellent water resistance and viscosity stability, stronger adhesion force to the different substrates and excellent hydrophobic property and oxygen barrier property, and can be applied to flexible plastic packaging for mildew prevention and freshness preservation.

Description

technical field [0001] The invention belongs to the technical field of packaging materials, and in particular relates to a method for preparing a mold-proof and fresh-keeping PVA coating film. Background technique [0002] Plastic wrap is a kind of plastic packaging product, usually made of ethylene as the masterbatch through polymerization reaction, mainly used in microwave oven food heating, refrigerator food preservation, fresh and cooked food packaging and other occasions, in family life, supermarkets, hotels and restaurants It is widely used in the field of industrial food packaging. According to the different materials used and the addition of plasticizers, plastic wrap is divided into various types, which can be applied to different occasions. Preservative film has been favored by people for its convenience, economy and attractive appearance. However, due to the general addition of plasticizers in the production process, the impact of plastic wrap on human health ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/04C09D129/04C09D7/12C08L23/06C08L23/12C08L67/02
CPCC08J7/0427C08J2323/06C08J2323/12C08J2367/02C08K3/26C08K9/04C08K9/06C08K2201/011C09D7/62C09D129/04
Inventor 田璐钟文张勇军
Owner 常德市德源招商投资有限公司
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