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Carboxyl-terminated hyperbranched polyester for processing polylactic acid and preparation method and application thereof

A technology of hyperbranched polyester and polylactic acid, which is applied in the field of carboxyl-terminated hyperbranched polyester for polylactic acid processing and its preparation, can solve the problems of performance degradation and affecting product performance, and achieve increased melt index, improved compatibility, The effect of the simple process of the method

Active Publication Date: 2022-07-05
WUHAN HYPERBRANCHED POLYMER RESINS SCI& TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the processing temperature is close to its thermal decomposition temperature, the molecular weight is easy to degrade during processing, and the performance is significantly reduced. For example, PLA is heat-treated at 180 °C for 5 hours, and its weight-average molecular weight drops sharply from 101,000 to 37,000.
The melting point of PLA is usually 155-185°C, and the processing temperature is 170-230°C. Therefore, pure PLA is often degraded during processing, which seriously affects the performance of the product. Improving the fluidity of PLA and efficient processing technology has become a major challenge in the PLA field.

Method used

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  • Carboxyl-terminated hyperbranched polyester for processing polylactic acid and preparation method and application thereof
  • Carboxyl-terminated hyperbranched polyester for processing polylactic acid and preparation method and application thereof
  • Carboxyl-terminated hyperbranched polyester for processing polylactic acid and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1 A kind of carboxyl-terminated hyperbranched polyester for polylactic acid processing, the preparation method is as follows:

[0033] Add 0.1 mol of succinic acid, 0.2 mol of citric acid, 0.4 mol of 3-hydroxypropionic acid, 0.236 g of p-toluenesulfonic acid, 30 g of toluene and 21.2 g of dimethylformamide to a device equipped with a condenser, a stirrer and a separator. In a four-necked flask of a water heater and a thermometer, heat it to 140 ° C under nitrogen protection, and stir the reaction at 140 ° C for 20 hours. At this time, the hydroxyl value of the system is measured. The hydroxyl value is lower than 10 mg KOH / g, indicating that the reaction is complete, The water-carrying agent toluene and dimethylformamide were removed in vacuum while still hot, taken out and cooled to obtain a carboxyl-terminated hyperbranched polyester (referred to as HBP-1) with a number-average molecular weight of 1050 g / mol.

[0034] Mix 0.4g HBP-1 and 200g polylactic acid ...

Embodiment 2

[0035] Embodiment 2 A kind of carboxyl-terminated hyperbranched polyester for polylactic acid processing, the preparation method is as follows:

[0036] 0.1 mol of glutaric acid, 1.0 mol of citric acid, 1.5 mol of 4-hydroxybutyric acid, 0.66 g of phosphoric acid (a liquid with a concentration of 85 wt %), 39.6 g of xylene were added to a device equipped with a condenser, agitator, water separator and In the four-necked flask of the thermometer, heat it to 150 ° C under nitrogen protection, and stir the reaction at 150 ° C for 15 hours. At this time, the hydroxyl value of the system is measured. The xylene with water agent is taken out and cooled to obtain a carboxyl-terminated hyperbranched polyester (referred to as HBP-2) with a number average molecular weight of 3500 g / mol.

[0037] Mix 1.0g HBP-2 and 200g polylactic acid evenly, process and granulate through a screw extruder at 180°C to obtain a hyperbranched polyester modified polylactic acid plastic with a smooth surface,...

Embodiment 3

[0038] Embodiment 3 A kind of carboxyl-terminated hyperbranched polyester for polylactic acid processing, the preparation method is as follows:

[0039] Add 0.1mol adipic acid, 2.0mol citric acid, 4.0mol 5-hydroxyvaleric acid, 0.73g tetrabutyl titanate, 60g xylene, 13g dimethylformamide to a device equipped with a condenser, agitator, water separator In a four-necked flask with a thermometer and a thermometer, heat it to 160 ° C under nitrogen protection, and stir the reaction at 160 ° C for 12 hours. At this time, the hydroxyl value of the system is measured. The hydroxyl value is lower than 10mgKOH / g, indicating that the reaction is complete. The water-carrying xylene and dimethylformamide are removed in vacuum, taken out and cooled to obtain a carboxyl-terminated hyperbranched polyester (referred to as HBP-3) with a number average molecular weight of 8600 g / mol.

[0040] Mix 4.0g of HBP-3 and 200g of polylactic acid uniformly, process and granulate through a screw extruder ...

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Abstract

The invention belongs to the technical field of hyperbranched polymers, and specifically discloses a carboxyl-terminated hyperbranched polyester for polylactic acid processing and a preparation method and application thereof. The carboxyl-terminated hyperbranched polyester is prepared by mixing citric acid, hydroxycarboxylic acid, dibasic carboxylic acid, polyester reaction catalyst and water-carrying agent evenly, and the molecular weight is about 1000-11000 g / mol. Applying the hyperbranched polyester to PLA processing can reduce the processing temperature by 10-25℃ and increase the melt index (fluidity) by 0.5-10 times. The process of the invention is simple, and the product has the functions of improving the fluidity of polylactic acid, reducing its processing temperature and inhibiting the degradation of polylactic acid during processing, and is expected to be used in the preparation of high-performance polylactic acid plastics and related fields.

Description

technical field [0001] The invention relates to the technical field of hyperbranched polymers and a preparation method thereof, in particular to a carboxyl-terminated hyperbranched polyester for polylactic acid processing and a preparation method and application thereof. Background technique [0002] Polylactic acid (PLA) is a polymer obtained by polymerizing lactic acid as the main raw material, and is a new type of biodegradable material. In addition to being biodegradable, the products made of polylactic acid have good biocompatibility, gloss, transparency, hand feel and heat resistance, as well as certain antibacterial properties, flame retardancy and UV resistance, and are widely used. It can be used as packaging materials, fibers and non-woven fabrics, etc., and can also be used in the fields of clothing, construction, agriculture, forestry, papermaking and medical care. The disadvantage is that the processing temperature is close to its thermal decomposition temperat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/06C08L67/04
CPCC08G63/06C08L67/04C08L2205/025
Inventor 陈苏芳赵桂张道洪姜其斌张俊珩李登锋何浏炜
Owner WUHAN HYPERBRANCHED POLYMER RESINS SCI& TECH CO LTD
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