Hyperbranched PBAT polyester and preparation method thereof

A technology of polyester and branched monomers, applied in the field of hyperbranched PBAT polyester and its preparation, can solve the problems of increased melt viscosity, low utilization rate of auxiliary agents, less active carboxyl groups, etc. The effect of high rate and high fluidity

Active Publication Date: 2022-05-20
FUHAI (DONGYING) ADVANCED MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the method to reduce and improve the fluidity of PBAT melt is mainly to add flow aids such as hyperbranched polyester after the PBAT polymerization is completed, but the carboxyl group content in commercially available PBAT products is mostly below 50mol/t, and some products Even up to 10mol/t, these commercially available products have less active carboxyl groups available for reaction, the utilization rate of additives is low, and some ungrafted small-molecu

Method used

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  • Hyperbranched PBAT polyester and preparation method thereof
  • Hyperbranched PBAT polyester and preparation method thereof
  • Hyperbranched PBAT polyester and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0051] The preparation steps of partially blocked third-generation HBPE are as follows:

[0052] Synthesis of second-generation HBPE: Put the nuclear unit (pentaerythritol or trimethylolpropane) and 2,2-dihydroxypropionic acid into the reactor, under the protection of nitrogen, heat up to 130°C while stirring, and then put in tetrabutyl titanate Esters, constant temperature reaction, when the acid value of the reaction system drops to 5mgKOH / g, the system is vacuumed for 1 hour, and the water produced by the reaction is extracted.

[0053] Synthesis of third-generation HBPE: Continue to feed nitrogen, add weighed 2,2-dihydroxypropionic acid and tetrabutyl titanate, and react at a constant temperature of 130°C. When the acid value of the reaction system drops to 5mgKOH / g, capping .

[0054] Partially capped HBPE synthesis: continue to feed nitrogen, add a certain amount of propionic acid, and react at a constant temperature of 140 ° C. When the acid value of the reaction syste...

Example Embodiment

[0057] Partially blocked three generations of HBPE formula table in embodiment 5:

[0058]

[0059] The index parameters of the partially blocked third-generation HBPE prepared according to the above formula and steps are as follows:

[0060]

Example Embodiment

[0062] Example 1

[0063] Table 1 Example 1 Feeding table

[0064]

[0065] (1) Esterification reaction:

[0066] Add the weighed terephthalic acid, 1,4-butanediol and adipic acid into the esterification kettle, turn on the heating, stir evenly, raise the temperature to 180°C, and carry out the esterification and dehydration reaction for 2 hours. The amount of water reached the theoretical value of 799.9g, and no more water was distilled out.

[0067] (2) Graft polycondensation: The completed co-esterification product, 5.01g of partially blocked third-generation HBPE, tetrabutyl titanate, triphenyl phosphate and 2,6-di-tert-butyl-4-methylphenol are added to the polymerization In the kettle, the reaction temperature is 220°C, the reaction pressure is 80KPa, the reaction time is 2h, and then added, the reaction temperature is 235°C, the reaction pressure is 50KPa, and the reaction is 1.5h; then the temperature rises to 240°C, the reaction pressure is 100Pa, the reaction tim...

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Abstract

The invention belongs to the technical field of biodegradable materials, and particularly relates to hyperbranched PBAT polyester and a preparation method thereof.The hyperbranched PBAT polyester is obtained by synthesizing a series of hydroxyl-terminated hyperbranched polyesters (HBPE) with specific hydroxyl values through gradual reaction of a core unit and a monomer and then copolymerizing the hyperbranched polyesters with terephthalic acid, 1, 4-butanediol and adipic acid. The active terminal hydroxyl group of HBPE can participate in esterification and polycondensation reaction, and can be used as polyhydric alcohol to extend the linear structure of a molecular chain into a branched structure, so that the crosslinking density of PBAT is improved, and the strength of PBAT is improved; meanwhile, the polycondensation time is shortened, and the product acid value is lower; the HBPE molecules have a hyperbranched structure similar to a sphere, the molecules are not tangled, after the PBAT molecular chain is introduced, the biodegradable polyester has the characteristics of low viscosity and high flowability, and the polyester is particularly suitable for biodegradable products such as special-shaped injection molding parts and thin-wall injection molding parts with complex structures.

Description

technical field [0001] The invention belongs to the technical field of biodegradable materials, and in particular relates to a hyperbranched PBAT polyester and a preparation method thereof. Background technique [0002] The increasingly serious "white pollution" problem has attracted great attention from countries all over the world, and it is imperative to develop biodegradable plastics. Polybutylene terephthalate-co-polybutylene adipate (PBAT) combines the degradation properties of aliphatic polyesters and the mechanical properties of aromatic polyesters, and has good ductility and elongation at break. However, most of PBAT cannot be used alone due to its low melt strength and low mechanical strength. It needs to be blended with PLA and other degradable materials for injection molding, while PLA and other biodegradable polyesters are expensive and hinder The popularization and application of degradable materials; the melt viscosity of PBAT is too high, the fluidity is poo...

Claims

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Application Information

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IPC IPC(8): C08G63/60C08G63/85
CPCC08G63/60C08G63/85
Inventor 王敏岳林黄森彪高天正廖广明
Owner FUHAI (DONGYING) ADVANCED MATERIAL TECH CO LTD
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