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Recyclable packaging material and preparation method thereof

A packaging material and peeling layer technology, applied in the field of recyclable packaging materials and their preparation, can solve the problems of low decomposition temperature, poor bonding strength, limitation and the like

Active Publication Date: 2021-09-10
北京中康顺医疗科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the bonding strength of polyvinyl alcohol to aluminum foil is poor, and the decomposition temperature is low, which is greatly limited in practical applications.

Method used

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  • Recyclable packaging material and preparation method thereof
  • Recyclable packaging material and preparation method thereof
  • Recyclable packaging material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0067] Add 1 mol of vinylpyrrolidone and 1 mol of acrylamide into 1 L of deionized water, stir the mixture for one hour under nitrogen purging, then add 2.2 g of ceric ammonium nitrate and 4 mL of 1N HNO to the system within 2 hours 3 Initiator solution in 90mL of water, heated to 40°C for polymerization reaction, after 10 hours, the obtained polymer gel was added to methanol for precipitation, the solid product was separated and washed with methanol, and then dried to obtain vinylpyrrolidone-propylene Amide copolymer 173g, determined by analysis vinylpyrrolidone-acrylamide copolymer contains 47mol% units derived from acrylamide, 53mol% units derived from vinylpyrrolidone, the number average molecular weight of the copolymer is 7.5 × 10 4 g / mol.

Embodiment 1

[0069] 15g of the vinylpyrrolidone-acrylamide copolymer of Preparation Example 1, 3g of sodium polyacrylate (number average molecular weight 2.2×10 4 g / mol, the same below) was heated and dissolved in 82g of water to form an aqueous solution, which was coated on a 15 μm thick aluminum foil layer 102 and dried at 90°C to form a 3 μm thick first peeling layer 101 on the aluminum foil layer 102. Then, a 35 μm thick polyethylene layer 100 (melt flow rate 16g / 10min, the same below) extrusion coating on the first release layer 101 to prepare a three-layer aluminum foil packaging film. The aluminum foil packaging film of the three-layer structure is as figure 1 shown.

Embodiment 2

[0071] 15 g of the vinylpyrrolidone-acrylamide copolymer of Preparation Example 1 and 5 g of sodium polyacrylate were heated and dissolved in 80 g of water to form an aqueous solution, which was coated on a 15 μm thick aluminum foil layer 102 and dried at 90° C. to form an aqueous solution on the aluminum foil layer. 102 is formed with a first peeling layer 101 with a thickness of 3 μm. Then, a 35 μm thick polyethylene layer 100 was extrusion coated on the first release layer 101 at a processing temperature of 300° C. using a slit extrusion type coater to prepare a three-layer structure aluminum foil packaging film.

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Abstract

The invention relates to a recyclable packaging material and a preparation method thereof. The packaging material can easily separate an aluminum foil layer from a polyethylene layer or a protective layer when soaked in hot water, so that useful aluminum foils and polymers can be classified and recycled. According to the recyclable packaging material, the aluminum foil and a polymer layer have relatively high peel strength, so that a situation of interlayer peeling is not easy to occur in the use process. In addition, the recyclable packaging material is simple in preparation process, safe, non-toxic and good in barrier property. Therefore, the recoverable packaging material is particularly suitable for being used as a flexible packaging material of food, medicine and electronic element products.

Description

technical field [0001] The invention relates to the field of packaging materials, in particular to a recyclable packaging material and a preparation method thereof. Background technique [0002] Aluminum foil packaging film is a commonly used material in food packaging, pharmaceutical packaging, electronic components, optoelectronic products and other electronic product packaging. It has the characteristics of light blocking, constant temperature, non-toxic and low cost, and is a good packaging material. [0003] Aluminum foil packaging film is basically a disposable packaging material, but with the increase in its use, more and more aluminum foil packaging film is discarded. After discarding, most of it is mixed with domestic garbage and discarded, and the recycling rate is low. After being discarded, on the one hand, it causes a huge waste of resources, and a large amount of aluminum foil and polymer materials cannot be reused; on the other hand, the accumulation of packag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B65D65/40B05D1/38B05D7/14C09D139/06C09D133/02C09D5/20
CPCB65D65/40B05D7/14B05D7/544B05D7/574B05D1/38C09D139/06C09D133/02C09D5/20B05D2518/00B05D2507/01B05D2508/00B05D2502/00B05D2420/01B05D2420/02C08L33/02Y02W30/80
Inventor 张一凡刘晓
Owner 北京中康顺医疗科技有限公司
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