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Biodegradable aliphatic-aromatic copolyester and application thereof

An aliphatic polyester, biodegradable technology, applied in the polyester field, can solve the problems of unsatisfactory heat preservation and moisturizing effect, low tear resistance of the film, unfavorable industrial production, etc. The probability of hole breakage and the effect of improving the oxygen transmission rate

Inactive Publication Date: 2015-04-08
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

[0038] Put 8.73 Kg of dimethyl terephthalate and 9 Kg of 1,4-butanediol into the reaction kettle, replace the air in the reaction kettle with nitrogen, then raise the temperature to 170°C, and treat the dimethyl terephthalate After completely melting, 10 g of isopropyl titanate was added, and the temperature was gradually raised to 180° C. for esterification. After the methanol slipping out reaches the theoretical amount, add 7.96 Kg of adipic acid and 142 g of dodecenylsuccinic acid, continue the reaction until the slipping out water reaches the theoretical amount, add 10 g of isopropyl titanate, and gradually heat up to 230~ 250 ° C, about 30 minutes to reduce the pressure in the reactor to below 60Pa, and continue to react under this condition until the power of the stirring motor reaches the set value. Fill the reaction kettle with high-purity nitrogen, extrude the melt through mouth molding, and then draw and pelletize to obtain copolyester, which is marked as P1.

Embodiment 2

[0040] Put 11.64Kg of dimethyl terephthalate, 9Kg of 1,4-butanediol, 5.40Kg of adipic acid, and 684g of octenylsuccinic anhydride into the reactor, and gradually raise the temperature to 170 o C, add 20g of n-butyl titanate, after methanol and water have slipped out to reach the theoretical amount, gradually raise the temperature to 230~250 o C, reduce the pressure in the reactor to below 60Pa in about 30 minutes, and continue to react under this condition until the power of the stirring motor reaches the set value. Fill the reaction kettle with high-purity nitrogen, extrude the melt through the mouth die, and then draw and pelletize the copolyester base material P20. After drying the P20, mix it with 0.6% hexamethylene diisocyanate Reaction in a twin-screw extruder, pelletized to obtain copolyester, marked as P2.

Embodiment 3

[0042] With 8.3Kg of purified terephthalic acid, 8Kg of 1,3-propanediol, drop in the reaction kettle, at 230 o C reacts until the amount of water slipping out reaches the theoretical value, adds 7Kg of adipic acid and 344g of butenyl succinic acid, and continues the reaction until the amount of water slipping out reaches the theoretical value. Add 20g of n-butyl titanate, and gradually raise the temperature to 230~250 oC, reduce the pressure in the reactor to below 60Pa in about 30 minutes, and continue to react under this condition until the power of the stirring motor reaches the set value. Fill the reaction kettle with high-purity nitrogen gas, extrude the melt through mouth molding, and then draw and pelletize the copolyester to obtain copolyester, which is marked as P3.

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Abstract

The invention discloses a biodegradable aliphatic-aromatic copolyester and application thereof. The biodegradable aliphatic-aromatic copolyester comprises the following components: component 1: an aromatic polyester unit comprising 45-60 mol% of aromatic diacid residues A1 and dihydroxy compound residues B; component 2: a linear aliphatic polyester unit comprising 37-54.7 mol% of linear aliphatic diacid residues A2 and the dihydroxy compound residues B; and component 3: an alkyl-containing side chain aliphatic polyester unit comprising 0.3-3 mol% of alkyl-containing side chain aliphatic diacid residues A3 and the dihydroxy compound residues B. As the biodegradable aliphatic-aromatic copolyester disclosed by the invention comprises the alkyl-containing side chain aliphatic polyester unit, the yield strength of a thin film prepared from the biodegradable aliphatic-aromatic copolyester is improved, thereby being favorable for improving the performance of tolerating puncture of crops and weeds of an agricultural plastic mulching film and reducing the probability of causing a hole breaking phenomenon; and the oxygen transmission rate is improved, the water vapor transmission rate is reduced, and when the prepared thin film is used as the agricultural plastic mulching film, better heat preservation and moisture preservation effects are realized.

Description

technical field [0001] The invention belongs to the technical field of polyester, in particular to a biodegradable aliphatic-aromatic copolyester containing an alkyl side chain 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 difficul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/685C08G63/52C08G63/183C08G63/78C08L67/02C08L67/06A01G13/02
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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