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Preparation of multi-stage structured hydrotalcite and application of multi-stage structured hydrotalcite in gasbarrier packaging material

A technology of structural water and hydrotalcite, applied in chitin polysaccharide coatings, polyether coatings, hyaluronic acid coatings, etc., can solve the problems affecting the barrier properties of packaging materials, difficult to inhibit the diffusion of oxygen molecules, and weak interaction forces. Achieve environmental protection and sustainable development, wide practicability and promotion value, good mechanical properties and thermal stability

Inactive Publication Date: 2015-07-22
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these inorganic substances can only block oxygen in the vertical direction, and it is difficult to inhibit the lateral diffusion of oxygen molecules between layers. Moreover, the disordered mixing of inorganic laminate materials and organic polymers often leads to incompatibility and incompatibility at the interface of materials. Weak interaction force, which affects the barrier properties of packaging materials
Therefore, there are still many difficulties and challenges in the pursuit of high barrier packaging materials

Method used

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  • Preparation of multi-stage structured hydrotalcite and application of multi-stage structured hydrotalcite in gasbarrier packaging material
  • Preparation of multi-stage structured hydrotalcite and application of multi-stage structured hydrotalcite in gasbarrier packaging material
  • Preparation of multi-stage structured hydrotalcite and application of multi-stage structured hydrotalcite in gasbarrier packaging material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A. Weigh 2.56g Mg(NO 3 ) 2 ·6H 2 O, 1.88g Al(NO 3 ) 3 9H 2 O and 3.00g of urea were dissolved in 100ml of deionized water, the mixed solution was fully stirred, transferred to an autoclave, and crystallized at a constant temperature of 100°C for 24 hours, cooled to room temperature, followed by centrifugation, washing, and drying to obtain magnesium aluminum Hydrotalcite precursor;

[0031] B. Roast the hydrotalcite precursor at 400°C for 3 hours to obtain a magnesium-aluminum composite metal oxide. Take 0.20g of magnesium-aluminum composite metal oxide and place it in a 1.0M sodium hydroxide solution, stir vigorously for 2 hours, and centrifuge, After washing and drying, a multi-level structure hydrotalcite is obtained;

[0032] C. The polyethylene terephthalate substrate with a thickness of 193nm was ultrasonically cleaned with water, ethanol, and acetone for 10 minutes, then cleaned with deionized water, and dried at room temperature;

[0033] D. Adsorb the tr...

Embodiment 2

[0036] A. Weigh 2.56g Mg(NO 3 ) 2 ·6H 2 O, 1.25g Al(NO 3 ) 3 9H 2O and 2.0000g of urea were dissolved in 100ml of deionized water, the mixed solution was fully stirred, transferred to an autoclave, and crystallized at a constant temperature of 110°C for 36 hours, cooled to room temperature, followed by centrifugation, washing, and drying to obtain magnesium aluminum Hydrotalcite precursor;

[0037] B. Roast the hydrotalcite precursor at 450°C for 4 hours to obtain a magnesium-aluminum composite metal oxide. Take 0.4g of the composite metal oxide and place it in a 0.8M sodium hydroxide solution, stir vigorously for 3 hours, and centrifuge, wash, After drying, a multi-level structure hydrotalcite is obtained;

[0038] C. The high-density polyethylene substrate with a thickness of 25 μm was ultrasonically cleaned with water, ethanol, and acetone for 10 minutes, then cleaned with deionized water, and dried at room temperature;

[0039] D. Adsorb the treated high-density pol...

Embodiment 3

[0042] A. Weigh 2.56g Mg(NO 3 ) 2 ·6H 2 O, 0.94g Al(NO 3 ) 3 9H 2 O and 1.50g of urea were dissolved in 100ml of deionized water, the mixed solution was fully stirred, transferred to an autoclave, and crystallized at a constant temperature of 120°C for 48 hours, cooled to room temperature, followed by centrifugation, washing, and drying to obtain magnesium aluminum Hydrotalcite precursor;

[0043] B. Roast the hydrotalcite precursor at 500°C for 5 hours to obtain a composite metal oxide, take 0.6g of the composite metal oxide and place it in a 0.5M sodium hydroxide solution, stir vigorously for 4 hours, centrifuge, wash and dry Obtain multi-level structure hydrotalcite;

[0044] C. The polyurethane substrate with a thickness of 35 μm was ultrasonically cleaned with water, ethanol, and acetone for 10 minutes, then cleaned with deionized water, and dried at room temperature;

[0045] D. Adsorb the treated polyurethane substrate on a spin coating machine, and then alternat...

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Abstract

The invention discloses preparation of multi-stage structured hydrotalcite and application of the multi-stage structured hydrotalcite in a gasbarrier packaging material. According to the invention, the multi-stage structured hydrotalcite is prepared through a roasting recovery method by virtue of the memory effect of hydrotalcite; then, the multi-stage structured hydrotalcite and a polymer are compounded to obtain a film by adopting an alternatively rotary coating technology, wherein the multi-stage structured hydrotalcite is capable of inhibiting the diffusion of oxygen molecules longitudinally and transversely and effectively prolonging a diffusion path of the oxygen molecules; furthermore, the surface oxygen vacancy of the multi-stage structured hydrotalcite has strong chemical adsorption effect on oxygen; therefore, the multi-stage structured hydrotalcite is the gasbarrier packaging material having excellent oxygen barrier property, thermal stability, mechanical stability and storage stability. The multi-stage structured hydrotalcite disclosed by the invention is wide in raw material source and low in cost and can satisfy environmental protection and sustainable development requirements; and therefore, the gasbarrier packaging material prepared based on the special structured hydrotalcite material has potential application value in the fields, such as packaging of foods, medicines and electronic devices.

Description

technical field [0001] The invention belongs to the field of inorganic-organic composite film functional materials, in particular to the preparation of a multi-level structure hydrotalcite and its application in gas barrier packaging materials. Background technique [0002] Hydrotalcite is a typical anionic layered material, in which the hydroxides of divalent and trivalent metal ions are highly dispersed and covalently bonded to form the main layer, and are rich in positive charges, and the anions between the layers are arranged in an orderly manner. And it can be exchanged, and the ratio of the metal elements of the laminate can be adjusted. In recent years, due to the unique structural characteristics of hydrotalcite materials and the resulting diversity in design, synthesis and assembly, their powder materials and thin film materials based on hydrotalcite have played an important role in catalysis, adsorption and functional devices. Has been widely used. The synthesis ...

Claims

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Application Information

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IPC IPC(8): C08J7/04C09D105/08C09D133/26C09D171/02C09D7/12C08L67/02C08L23/06C08L75/04
Inventor 韩景宾潘婷豆义波刘晓西卫敏
Owner BEIJING UNIV OF CHEM TECH
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