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Low-odor biodegradable PLA alloy applied to food contact field and preparation method of low-odor biodegradable PLA alloy

A food contact, low-odor technology, applied in the direction of biological packaging, climate sustainability, sustainable manufacturing/processing, etc., can solve the problems that have not been discovered yet, reduce odor, and use high temperature, so as to avoid uneven dispersion and overall odor Low, good compatibility effect

Active Publication Date: 2021-08-06
WANHUA CHEMICAL (NINGBO) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reduction of odor through the principle of coating adsorption is limited by the type of filler, processing technology and application scenarios of PLA.
Food-contact PLA alloys are also used in hot drinks. The use temperature is sometimes high, which will affect the coating adsorption effect, and no food-grade fillers with coating adsorption effect have been found yet.
[0005] Therefore, the existing low-odor PLA alloy preparation methods are not suitable for the preparation of low-odor food contact PLA alloy materials, and new odor control ideas are needed to develop low-odor biodegradable PLA alloys for food contact applications

Method used

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  • Low-odor biodegradable PLA alloy applied to food contact field and preparation method of low-odor biodegradable PLA alloy
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  • Low-odor biodegradable PLA alloy applied to food contact field and preparation method of low-odor biodegradable PLA alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Prepare vanilla extract

[0050]Weigh 50g of vanilla pods into a flask, add 450mL of ethanol, heat in a constant temperature water bath, install a reflux device, set the temperature of the water bath to 70°C, and heat for 15 hours; filter and collect the clarified extract.

[0051] (2) Preparation of flavor modified porous silicon aluminum

[0052] Weigh 18g of porous aluminosilicate powder and add it to 200mL of the above extract, heat it in a constant temperature water bath, install a reflux device, and adjust the pH to 4-5 with dilute hydrochloric acid. ℃, heating and reacting for 8 hours, pour the mixed liquid into a vacuum drying tray, and vacuum-dry at 100 ℃ for 4 hours to prepare the fragrance-modified porous silica-alumina.

[0053] (3) With essence modified porous silicon aluminum and the formula component in table 1 as raw material, and with reference to the raw material consumption in table 1, prepare PLA alloy according to the following method:

[0054...

Embodiment 2

[0059] (1) Prepare vanilla extract

[0060] Weigh 50g of vanilla pods into a flask, add 400mL of ethanol, heat in a constant temperature water bath, install a reflux device, set the temperature of the water bath to 60°C, and heat for 12.5h; filter and collect the clarified extract.

[0061] (2) Preparation of flavor modified porous silicon aluminum

[0062] Weigh 14g of porous aluminosilicate powder and add it to 200mL of the above extract, heat it in a constant temperature water bath, install a reflux device, and adjust the pH to 4-5 with dilute hydrochloric acid. ℃, heating and reacting for 7 hours, pouring the mixed liquid into a vacuum drying tray, and drying in vacuum at 90 ℃ for 2 hours to obtain flavor-modified porous silica-alumina.

[0063] (3) With essence modified porous silicon aluminum and the formula component in table 1 as raw material, and with reference to the raw material consumption in table 1, prepare PLA alloy according to the following method:

[0064] ...

Embodiment 3

[0069] (1) Prepare vanilla extract

[0070] Weigh 50g of vanilla pods into a flask, add 350mL of ethanol, heat in a constant temperature water bath, install a reflux device, set the temperature of the water bath to 50°C, and heat for 18 hours; filter and collect the clarified extract.

[0071] (2) Preparation of flavor modified porous silicon aluminum

[0072] Weigh 7g of porous aluminosilicate powder and add it to 200mL of the above extract, heat it in a constant temperature water bath, install a reflux device, and adjust the pH to 4-5 with dilute hydrochloric acid. ℃, heating and reacting for 6 hours, pouring the mixed solution into a vacuum drying tray, and drying in vacuum at 80 ℃ for 1 hour to prepare the fragrance-modified porous silica-alumina.

[0073] (3) With essence modified porous silicon aluminum and the formula component in table 1 as raw material, and with reference to the raw material consumption in table 1, prepare PLA alloy according to the following method:...

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Abstract

The invention provides a low-odor biodegradable PLA alloy capable of being applied to the field of food contact and a preparation method of the low-odor biodegradable PLA alloy. The PLA alloy is prepared from the following raw materials: PLA, PBS, mineral powder, an anti-hydrolysis agent, a chain extender and essence modified porous silicon-aluminum. The preparation method comprises the following steps: firstly preparing a vanilla extracting solution, then adding porous aluminosilicate powder and diluted hydrochloric acid, carrying out modification through co-heating, vacuum drying and other process treatments to prepare essence modified porous silicon aluminum, and finally preparing the low-odor biodegradable PLA alloy. On one hand, the essence modified porous silica-alumina emits vanilla flavor to cover the smell of the raw materials, and on the other hand, the porous silica-alumina can adsorb small peculiar smell molecules generated in the PLA processing process, so that the PLA alloy achieves the effect of low smell. The prepared PLA alloy can be widely applied to the field of food contact materials such as straws, meal boxes and shopping bags.

Description

technical field [0001] The invention belongs to the field of food-contact degradable materials, in particular to a low-odor biodegradable PLA alloy applied in the field of food-contact and a preparation method thereof. Background technique [0002] In recent years, countries have successively issued bans on plastics, and many provinces and cities in my country have begun to implement strong bans on plastics. Biodegradable materials have attracted more and more attention, and their application fields are constantly expanding, such as food contact materials, mulch, film bags, etc. . [0003] Modified polylactic acid has good degradability and mechanical properties, and can be seen everywhere in daily life, such as milk tea straws, infusion sets, cups and lunch boxes, etc. As it is mostly used in food contact materials, the defects of some modified polylactic acid with obvious odor and odor are gradually revealed, and the odor cannot be accepted by the public, which limits the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08L67/04C08K9/04C08K7/26
CPCC08L67/02C08L2201/08C08L2201/06C08L67/04C08K9/04C08K7/26Y02W90/10
Inventor 袁天楠王倩倩吴俊李明哲
Owner WANHUA CHEMICAL (NINGBO) CO LTD
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