Method for preparing high-efficient gel-free long-chain branching polylactic acid

A long-chain branched, polylactic acid technology, applied in the field of preparation of long-chain branched polylactic acid, can solve problems such as difficult to control cross-linked structure and unfavorable processing by free radical reaction, achieve easy implementation, improved melt strength, equipment The effect of less investment

Active Publication Date: 2018-07-31
GUIZHOU UNIV
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AI Technical Summary

Benefits of technology

This technology uses metallic oxides like iron or copper powders as catalysts during polymerization reactions. These materials improve the rate at which certain chemical compounds react together when mixed into plastic products made from these resins. By adding this type of material onto existing plastisol compositions containing other ingredients, they enhance their properties without making them more expensive than what was previously possible due to poor mixing capabilities.

Problems solved by technology

Technological Problem addressed in this patented technical issue relating to improving the physical property value of artificial plastic substances like PET and LCD while reducing their impact upon human health and wildlife environments. Current solutions involve modifying these types of plastic compositions without affecting them physically important factors like melting temperature, crystal growth speed, heat resistance, viscosities, flowability, tensile elongations, stiffiness, durability, chemical stability, and ease of handling. Additionally, current methods require prolonged periods of reactors, leading to slowdown times and potential issues related to decomposition.

Method used

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  • Method for preparing high-efficient gel-free long-chain branching polylactic acid
  • Method for preparing high-efficient gel-free long-chain branching polylactic acid

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[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

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Claims

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Application Information

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Owner GUIZHOU UNIV
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