Biodegradable aliphatic-aromatic copolyester and application thereof

An aliphatic polyester and biodegradable technology, applied in the field of polyester, can solve the problems of film rupture, unfavorable industrial production, and limited application, so as to achieve tear resistance, improve the quality of impact damage caused by falling marks, and reduce the phenomenon of perforation Occurrence rate, effect of yield strength improvement

Active Publication Date: 2015-04-01
KINGFA SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN1071342C discloses the biodegradable copolyester obtained by the copolymerization of terephthalic acid, adipic acid, dibasic acid containing sulfonic acid group and diol, which has good biodegradability, but when used as mulch material, the Under the action of weeds, problems such as perforation are prone to occur, resulting in unsatisfactory heat preservation and moisturizing effects, thus limiting the application of biodegradable polyester mulches
The copolymer needs to synthesize three prepolymers separately, and the preparation steps are cumbersome, which is not conducive to industrial production
Moreover, the copolyester has a block structure, and the film made of it has low tear resistance. In actual use, large-area film ruptures are prone to occur after holes appear, thus limiting its application in the agricultural mulch industry.

Method used

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  • Biodegradable aliphatic-aromatic copolyester and application thereof
  • Biodegradable aliphatic-aromatic copolyester and application thereof
  • Biodegradable aliphatic-aromatic copolyester and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Put 8.73 Kg of dimethyl terephthalate and 9 Kg of 1,4-butanediol into the reactor. After replacing the air in the reactor with nitrogen, the temperature is raised to 170°C, and the dimethyl terephthalate After it was completely melted, 10 g of isopropyl titanate was added, and the temperature was gradually raised to 180°C for esterification reaction. After the methanol leached out reached the theoretical amount, 7.96 Kg of adipic acid and 97 g of 2-triglycidyl succinic acid were added, and the reaction was continued until the leached water reached the theoretical amount, then 10 g of isopropyl titanate was added, gradually Raise the temperature to 230~250℃, reduce the pressure in the reactor to below 60Pa for about 30min, and continue the reaction under this condition until the power of the stirring motor reaches the set value. Fill the reactor with high-purity nitrogen, extrude the melt through the mouth mold, and then stretch and pelletize to obtain the copolyester, wh...

Embodiment 2

[0041] Put 11.64Kg of dimethyl terephthalate, 9Kg of 1,4-butanediol, 5.40Kg of adipic acid, and 354g of 2-tributylene glycol monomethyl ether succinic anhydride into the reactor, and gradually increase the temperature to 170 o C. Add 20g of n-butyl titanate, and gradually increase the temperature to 230~250 after the methanol and water have reached the theoretical amount. o C. Reduce the pressure in the reactor to below 60 Pa for about 30 minutes, and continue the reaction under this condition until the power of the stirring motor reaches the set value. Fill the reactor with high-purity nitrogen, extrude the melt through the mouth, stretch and pelletize to obtain the copolyester base material P20. After drying the P20, mix it with 0.6% hexamethylene diisocyanate. Reacted in a twin-screw extruder and pelletized to obtain a copolyester, marked as P2.

Embodiment 3

[0043] Put 9.89 Kg of purified terephthalic acid and 9Kg of 1,4-butanediol into the reactor at 230 o C reacted until the amount of leached water reached the theoretical value, 7Kg of adipic acid and 234g of 2-dipropylene glycol monopropyl ether succinic acid were added, and the reaction was continued until the amount of leached water reached the theoretical value. Add 20g of n-butyl titanate and gradually increase the temperature to 230~250 o C. Reduce the pressure in the reactor to below 60 Pa for about 30 minutes, and continue the reaction under this condition until the power of the stirring motor reaches the set value. Fill the reactor with high-purity nitrogen, extrude the melt through the mouth mold, and then stretch and pelletize to obtain the copolyester, which is marked as P3.

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Abstract

The invention discloses a biodegradable aliphatic-aromatic copolyester and an application thereof. The biodegradable aliphatic-aromatic copolyester comprises the following components: component 1: an aliphatic polyester unit composed of 45-60mol% of aromatic diacid residue A1 and dihydroxyl compound residue B; component 2: a linear aliphatic polyester unit composed of 37-54.7 mol% of linear aliphatic diacid residue A2 and dihydroxyl compound residue B; component 3: a polyether-containing side-chain aliphatic polyester unit composed of 0.3-3mol% of polyether-containing side-chain aliphatic diacid residue A3 and dihydroxyl compound residue B. According to the biodegradable aliphatic-aromatic copolyester disclosed by the invention, because the polyether-containing side-chain aliphatic polyester unit is contained, the yield strength of the prepared film is increased, the improvement of the puncture resistance of the agricultural mulch film to crops and weeds is promoted, and the probability of the occurrences of a hole breaking phenomenon is reduced; moreover, the anti-tear strength and the dart-drop-impact breakage quality are improved, and the prevention of hole breakage of the film during a use process is promoted.

Description

technical field [0001] The invention belongs to the technical field of polyester, in particular to a biodegradable aliphatic-aromatic copolyester containing polyether side chains and its application in the agricultural mulch industry. Background technique [0002] At present, most of the plastic films used in agricultural production are synthetic polymers, such as polyethylene (PE), polyvinyl chloride (PVC), etc. While the use of these plastic film materials has brought certain economic benefits to agriculture, it has also caused serious white pollution to the environment. These materials will exist stably in the natural environment for a long time. A large number of film fragments remaining in the land will destroy the soil structure, harden the soil, and prevent crops from absorbing water and fertilizers from the soil. Long-term use will lead to crop yield reduction. In addition, the recovery of plastic film from the field is heavy workload and high cost, and it is diffic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/672C08L67/02A01G13/02
CPCY02A40/28
Inventor 赵巍焦建叶丹滢苑仁旭熊凯钟宇科徐依斌吴水珠
Owner KINGFA SCI & TECH CO LTD
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