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Vegetable oil-chitosan-based biodegradable pua and its preparation method and application

A technology of biodegradation and chitosan, applied in application, plant protection cover, agriculture, etc., can solve the problem of low curing degree of cured film, achieve the effect of increasing biodegradability and biocompatibility, and expanding the scope of application

Active Publication Date: 2020-12-01
AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] But, the biodegradable PUA that prior art prepares, the degree of curing of its cured film is generally not high (gel rate is 90.89%~93.13%), and its thermal stability also needs to be improved (10% temperature of weight loss is 305 ℃ ) to improve its environmental resistance (mainly heat aging resistance and sunlight resistance)

Method used

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  • Vegetable oil-chitosan-based biodegradable pua and its preparation method and application
  • Vegetable oil-chitosan-based biodegradable pua and its preparation method and application
  • Vegetable oil-chitosan-based biodegradable pua and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Example 1 Linoleic acid-chitosan-based biodegradable PUA

[0048] The specific steps for the preparation of linoleic acid-chitosan-based biodegradable PUA are as follows:

[0049] (1) Preparation of chitosan grafted linoleic acid (CS-g-TO) copolymer:

[0050] 29.85 g of linoleic acid was weighed and poured into the flask, 20.4 g of acetic anhydride was added to the flask, the reaction system was sealed, heated in an oil bath at 125° C., and reacted for 4 h. The generated acetic acid and unreacted acetic anhydride were removed under reduced pressure (78° C., 90 KPa) to obtain a reddish-brown linoleic anhydride liquid, which was dried, sealed and stored for later use. Weigh 1 g of chitosan with a viscosity average molecular weight of 1.0 × 105 and a degree of deacetylation of 93%, dissolve it in 30 mL of 1% (v / v) aqueous glacial acetic acid, add 70 mL of methanol and stir vigorously to make the solution system clear and uniform. State, add sodium iodide 2g, mix, add lin...

Embodiment 2

[0061] Example 2 Ricinoleic acid-chitosan-based biodegradable PUA

[0062] (1) Preparation of chitosan-grafted ricinoleic acid (CS-g-TO) copolymer:

[0063] 29.85 g of ricinoleic acid was weighed and poured into a flask, 20.4 g of acetic anhydride was added to the flask, the reaction system was sealed, heated in an oil bath at 130° C., and reacted for 3 h. The resulting acetic acid and unreacted acetic anhydride were removed under reduced pressure (78°C, 90KPa) to obtain a reddish brown ricinoleic anhydride liquid, which was dried, sealed and stored for later use. Weigh the viscosity average molecular weight as 1.5×10 5 , 1 g of chitosan with a degree of deacetylation of 91%, dissolved in 30 mL of glacial acetic acid 1% (v / v) aqueous solution, added 70 mL of methanol and vigorously stirred to make the solution system clear and uniform, add 2 g of sodium iodide, mix , add ricinoleic anhydride and pyridine dropwise, wherein the reaction molar ratio of ricinoleic anhydride / chit...

Embodiment 3

[0071] Example 3 Linoleic acid-chitosan-based biodegradable PUA

[0072] (1) Preparation of chitosan grafted linoleic acid (CS-g-TO) copolymer:

[0073] 29.85 g of linoleic acid was weighed and poured into the flask, 20.4 g of acetic anhydride was added to the flask, the reaction system was sealed, heated in an oil bath at 120° C., and reacted for 5 h. The resulting acetic acid and unreacted acetic anhydride were removed under reduced pressure (78° C., 90 KPa) to obtain a reddish-brown linoleic anhydride liquid, which was dried, sealed and stored for later use. Weigh the viscosity average molecular weight as 1.0×10 5 , 1 g of chitosan with a degree of deacetylation of 93%, dissolved in 30 mL of glacial acetic acid 1% (v / v) aqueous solution, added 70 mL of methanol and vigorously stirred to make the solution system clear and uniform, add 2 g of sodium iodide, mix , add linoleic anhydride and pyridine dropwise, wherein the reaction molar ratio of linoleic anhydride / chitosan am...

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Abstract

The invention belongs to the field of biomass macromolecular functional materials, and particularly relates to vegetable oil-chitosan-based biodegradable PUA. The structural formula of the vegetable oil-chitosan biodegradable PUA is as shown in formula (I): (the formula (I) is shown in the description), wherein p is equal to 0 or 1; v is equal to 0 or 1; m+s is greater than 0 and less than 4, h+m+n+s+t is greater than 12 and less than 16, and h, m, n, s and t are respectively a natural number; R1 is a straight-chain or branch-chain alkylene of C1 to C4; R2 is an aromatic and aliphatic organicgroup; R3 is a straight-chain or branch-chain alkylene of C1 to C5; and R4 is CH3 or H. The invention also discloses a preparation method and application of the vegetable oil-chitosan biodegradable PUA. By adopting the vegetable oil-chitosan-based PUA, not only can the water resistance and heat stability of the vegetable oil be used, and the antibacterial performance and bio-compatibility of the chitosan can also be used, so that the biodegradability and the bio-compatibility of a cured film can be improved, the application range of the vegetable oil can be enlarged, and the theoretical valueand economical value are high.

Description

technical field [0001] The invention belongs to the field of biomass polymer functional materials, in particular to a vegetable oil-chitosan-based biodegradable PUA and a preparation method and application thereof. Background technique [0002] In the late 1970s, my country introduced mulching technology. With the advancement of technology in the plastics industry and the continuous improvement of mulching products and methods, mulching technology has been rapidly popularized and applied. At present, the application of plastic film mulching technology has greatly increased the output of vegetables, corn, peanuts, cotton and other crops in my country, and has made a significant contribution to ensuring the safe supply of agricultural products in my country. In 2017, the national mulching film consumption reached 1.601 million tons, covering an area of ​​more than 18 million hm 2 . At the same time, the wide application of mulching film has also brought a series of problems, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/67C08G18/64A01G13/02C08B37/08
CPCA01G9/1438C08B37/003C08G18/6484C08G18/672C08G2230/00
Inventor 周闯李普旺杨子明陶金龙吕明哲杨卓鸿李思东陈煜孔令学王超何祖宇
Owner AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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