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A method for rapidly preparing long-chain branched polylactic acid resin and polylactic acid resin prepared therefrom

A technology of long-chain branched polylactic acid and polylactic acid resin, applied in the field of polylactic acid resin, can solve the problem that it is difficult to obtain a product with a larger molecular weight in an amount of oxazoline compound, the product molecular weight and the degree of branching are difficult, and the melt strength is difficult. Problems such as not greatly improved, to achieve the effect of significant branching effect, effective branching effect, high molecular weight

Active Publication Date: 2016-06-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of obtaining long-chain branches by free radical reaction, that is, adding an organic peroxide-based free-radical initiator to the system, although the reaction is rapid and can introduce long-chain branched structures, due to the randomness of the initiator free radical hydrogen abstraction reaction, It is possible to cause branching of polylactic acid and to promote its degradation, which makes it very difficult to predict and control the molecular weight and branching degree of the product according to the needs, so that it is difficult to ensure the performance of the product; in contrast, the functional group reaction can Control the branching degree and molecular weight of long-chain branched products to a certain extent according to needs
After searching, the existing technical solutions about using oxazoline compounds as functional group monomers to realize polylactic acid chain extension in the melt processing process, although the molecular weight of the product has been increased to a certain extent, the melt strength has not been greatly improved
In addition, due to the limited concentration of carboxyl groups at the end of the polylactic acid chain, it is also difficult to obtain a product with a larger molecular weight by simply increasing the dosage of oxazoline compounds.

Method used

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  • A method for rapidly preparing long-chain branched polylactic acid resin and polylactic acid resin prepared therefrom
  • A method for rapidly preparing long-chain branched polylactic acid resin and polylactic acid resin prepared therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Two-step functional group reaction for rapid preparation of long-chain branched polylactic acid

[0028]Add 100 parts by weight of polylactic acid resin to an internal mixer with a rotation speed of 20 rpm at 190°C, and then add 0.15 parts of 1,3,5-trimethyl-2,4,6-tris(3 ,5-di-tert-butyl-4-hydroxybenzyl)benzene, 0.37 parts of pyromellitic dianhydride, 1 part of 2,2'-(1,4-phenylene)bisoxazoline and three 0.1 part of phenylphosphine, mixed for 2 minutes; then the internal mixer was raised to 60 rpm, and blended until the reaction was completed, and stopped after about 7 minutes to obtain long-chain branched polylactic acid resin. The results of the melt index (190°C, 2.16kg load) of the obtained reaction product material according to the ASTM D1238 standard are shown in Table 1, and the torque and temperature curves in the internal mixer are shown in Table 1. figure 1 .

Embodiment 2

[0030] Two-step functional group reaction for rapid preparation of long-chain branched polylactic acid

[0031] 100 parts by weight of polylactic acid resin, 0.15 parts of 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, 0.37 parts Pyromellitic dianhydride, 0.41 parts of 2,2'-(1,4-phenylene) bisoxazoline and 0.1 part of triphenylphosphine, added at 200°C to a twin-screw extruder with a rotation speed of 200rpm Machine, direct extrusion to obtain long-chain branched polylactic acid resin. The melt index test results are shown in Table 1.

Embodiment 3

[0033] Two-step functional group reaction for rapid preparation of long-chain branched polylactic acid

[0034] 100 parts by weight of polylactic acid resin, 0.15 parts of 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, 0.37 parts Pyromellitic dianhydride, 2.46 parts of 2,2'-(1,4-phenylene) bisoxazoline and 0.08 parts of triphenylphosphine, added at 200°C to a twin-screw extruder with a rotation speed of 200rpm Machine, direct extrusion to obtain long-chain branched polylactic acid resin. The melt index test results are shown in Table 1,

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Abstract

The invention discloses a method for quickly preparing long chain branch polylactic resin and prepared polylactic resin. The method comprises the step of carrying out melt reaction and mixing on polylactic resin, an antioxidant, anhydride polyfunctional monomers, oxazoline polyfunctional monomers and triphenylphosphine to prepare the long chain branch polylactic resin, wherein counted by 100 parts by weight of polylactic resin, the anhydride polyfunctional monomers account for 0.1-1 part, the oxazoline polyfunctional monomers account for 0.1-3 parts and triphenylphosphine accounts for 0.05-0.1 part. By adopting the method disclosed by the invention, the branching degree of the product can be well controlled to regulate and control the melt strength of the product according to actual demand.

Description

technical field [0001] The invention relates to the field of polylactic acid resins, and more particularly, relates to a method for rapidly preparing long-chain branched polylactic acid resins and the polylactic acid resins prepared therefrom. Background technique [0002] In recent years, biodegradable polymer materials have attracted widespread attention due to their significant advantages of not causing serious pollution to the environment after use. Among them, the polylactic acid material is particularly prominent. Not only can it be degraded and returned to nature after use, but its source does not depend on the exploitation of petroleum and is a completely renewable energy source. This makes the development and use of this material completely realize the natural cycle. Really meet the needs of low-carbon environmental protection. In addition, compared with similar polyester materials, polylactic acid has many advantages such as good mechanical properties and thermopl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/685C08L67/04
Inventor 刘建叶张师军张丽英白弈青邹浩张浩
Owner CHINA PETROLEUM & CHEM CORP
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