A kind of preparation method of high-efficiency gel-free long-chain branched polylactic acid

A technology of long-chain branching and polylactic acid, which is applied in the field of preparation of long-chain branched polylactic acid, can solve the problems of difficult control of free radical reaction, cross-linking structure, unfavorable processing, etc., and achieves easy implementation, improved melt strength, and high efficiency. high effect

Active Publication Date: 2020-05-12
GUIZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method also has the disadvantages of difficult control of free radical reactions and easy generation of cross-linked structures, which is not conducive to subsequent processing.

Method used

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  • A kind of preparation method of high-efficiency gel-free long-chain branched polylactic acid
  • A kind of preparation method of high-efficiency gel-free long-chain branched polylactic acid

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preparation example Construction

[0024] The invention provides a method for preparing high-efficiency gel-free long-chain branched polylactic acid. In the preparation method, the present invention utilizes the coordination effect between the nanometer metal oxide particles and the macromolecular polylactic acid and the ester group of the multifunctional small molecular ester monomer to activate the ester group, thereby promoting the synthesis of the multifunctional small molecular ester monomer. The transesterification reaction between body and macromolecular polylactic acid is used to prepare long-chain branched polylactic acid with high melt strength and significant strain hardening characteristics. The principle is as follows:

[0025]

[0026] Among them, R 1 , R 2 , R 3 The same or different, it is a hydrocarbon group with 1 to 10 C atoms; M x o y It is a nanometer metal oxide particle, and M is Zn, Sn, Fe, Al, Ti, etc.

[0027] The test equipment that the present invention adopts in the embodime...

Embodiment 1

[0033] Take polylactic acid (left-handed polylactic acid pellets, melt index is 3.8g / 10min, molecular weight is 150000, 190°C) and nano-zinc oxide, after drying in a vacuum oven at 60°C for 12h, weigh 100g of dry polylactic acid and 0.2g nanometer zinc oxide (particle size is 50nm) is premixed. Dissolve 2g of trimethylolpropane triacrylate in acetone, and after the dissolution is complete, spray the acetone solution evenly on the premixed polylactic acid pellets, and place the acetone in a vacuum drying oven at 40°C for 6 hours to volatilize the acetone at a vacuum degree of 10 - 6 MPa, then the mixture was added to the material chamber of the internal mixer, the temperature was set to: 185°C in the first zone, 185°C in the second zone, 190°C in the third zone, the rotor speed: 80 rpm, and the material was discharged after 7 minutes of reaction. Some samples were taken for performance testing and melt strength determination. The results are shown in Table 1.

Embodiment 2

[0035] Take polylactic acid (left-handed polylactic acid pellets, melt index of 3.8g / 10min, molecular weight of 150000, 190°C) and nano-zinc oxide, dry in a vacuum oven at 60°C for 12h, weigh 100g of dry polylactic acid and 0.4 g Nano Zinc Oxide 50nm pre-mixed. Dissolve 2g of trimethylolpropane triacrylate in acetone, and after the dissolution is complete, spray the acetone solution evenly on the premixed polylactic acid pellets, and place the acetone in a vacuum drying oven at 40°C for 6 hours to volatilize the acetone at a vacuum degree of 10 - 6 MPa, then the mixture was added to the material chamber of the internal mixer, the temperature was set to: 185°C in the first zone, 185°C in the second zone, 190°C in the third zone, the rotor speed: 80 rpm, and the material was discharged after 7 minutes of reaction. Some samples were taken for performance testing and melt strength determination. The results are shown in Table 1.

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Abstract

The invention discloses a method for preparing high-efficient gel-free long-chain branching polylactic acid, and belongs to the technical field of high-performance polymer preparation. According to the method, metallic oxide nano particles are adopted as an accelerating agent, and the coordination between the ester group of macro molecular polylactic acid and the metallic oxide nano particle and between the ester group of a small molecular ester monomer and the metallic oxide nano particle is utilized to activate the ester groups, so that the ester exchange reaction between a polyfunctional small molecular ester monomer and a macro molecular polylactic acid is promoted to prepare the long-chain branching polylactic acid with high melt strength and significant strain hardening characteristics. The result reveals that the melt strength of the polylactic acid is increased by many folds by means of the method, the melt strength can be improved up to thirty folds, the gel content is zero, the adopted metallic oxide nano particles and the polyfunctional ester monomer are environmentally friendly, free from toxin and pollution, the source of the polyfunctional ester monomer is extensive,and most of the polyfunctional ester monomers can be used in food related industries, so that the method is a high-efficient, environmental-friendly and gel-free long-chain branching polylactic acid preparation method.

Description

technical field [0001] The invention belongs to the technical field of preparation of high-performance polymer materials, and in particular relates to a preparation method of high-efficiency gel-free long-chain branched polylactic acid. Background technique: [0002] The emergence of disposable plastic products such as disposable tableware and disposable plastic bags has greatly facilitated people's daily life, but usually the raw materials for making disposable plastic products are non-degradable general-purpose plastics, which make it greatly convenient for people's lives. But it caused serious white pollution to the environment. Based on this situation, the government and environmental protection departments have issued a plastic restriction order, but so far the effect seems to be small. Although many businesses have implemented paid measures for disposable lunch boxes and plastic bags, with the continuous improvement of people's living standards, The low fees don't see...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/91C08K3/22
CPCC08G63/912C08K3/22C08K2003/2227C08K2003/2231C08K2003/2241C08K2003/2272C08K2003/2296C08K2201/011
Inventor 罗筑杨乐
Owner GUIZHOU UNIV
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