Method for preparing long-chain branch polylactic acid resin by combination of two-step function group reaction and linear enantiomer polylactic acid

A technology of long-chain branched polylactic acid and polylactic acid resin, applied in the field of polymer processing, can solve the problems of difficulty in product molecular weight and branching degree, loss of long branching effect, unfavorable continuous production, etc., and is conducive to large-scale continuous production. Production, significant branching effect, high melt strength effect

Active Publication Date: 2015-06-17
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 make polylactic acid produce branched chains and promote its degradation, which makes it very difficult to predict and control the molecular weight and branching degree of the product according to needs; in contrast, the functional group reaction can be controlled to a certain extent according to needs. Branching degree and molecular weight of long-chain branched products
After searching, there are polylactic acid long-branched technical solutions that use epoxy compounds as functional group monomers in the melt processing process, and use acid anhydride compounds and epoxy compounds as reactive monomers at the same time, although the product melt strength It has been improved, but the slow reaction rate is very unfavorable for continuous production
On the other hand, if the reaction rate is increased by increasing the processing temperature, the effect of long branching will be greatly lost due to the intensified degradation reaction in the process.

Method used

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  • Method for preparing long-chain branch polylactic acid resin by combination of two-step function group reaction and linear enantiomer polylactic acid
  • Method for preparing long-chain branch polylactic acid resin by combination of two-step function group reaction and linear enantiomer polylactic acid
  • Method for preparing long-chain branch polylactic acid resin by combination of two-step function group reaction and linear enantiomer polylactic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Synthesis of Long-chain Branched Polylactic Acid by Two-step Functional Group Reaction Combined with Linear Enantiomer Polylactic Acid

[0027] Add 100 parts by weight of linear polylactic acid resin and 5.3 parts of anti-linear enantiomer polylactic acid to an internal mixer with a rotation speed of 20 rpm at 230 ° C, and add 0.16 parts of 1,3,5-trimethyl- 2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, 0.39 parts of pyromellitic dianhydride, 0.52 parts of triglycidyl isocyanuric acid, mixed 2 Minutes; then the internal mixer was raised to 100rpm, melt blending until the end of the reaction, that is, stop after about 8.5 minutes, to obtain long-chain branched polylactic acid. Table 1 shows the melt index (190° C., 2.16 kg load) of the obtained reaction product material measured according to the ASTM D1238 standard. The torque and temperature curves in the internal mixer are shown in figure 1 , at 180°C and the strain is 5% under the condition of viscosity chang...

Embodiment 2

[0029] Synthesis of Long-chain Branched Polylactic Acid by Two-step Functional Group Reaction Combined with Linear Enantiomer Polylactic Acid

[0030] Add 100 parts by weight of linear polylactic acid resin and 11.1 parts of linear enantiomer polylactic acid to an internal mixer with a rotation speed of 20 rpm at 230 ° C, and add 0.17 parts of 1,3,5-trimethyl- 2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, 0.39 parts of pyromellitic dianhydride, 0.52 parts of triglycidyl isocyanuric acid, mixed 2 Minutes; then the internal mixer was raised to 100rpm, melt blending until the end of the reaction, that is, stop after about 8.5 minutes, to obtain long-chain branched polylactic acid. The melt index test results are shown in Table 1.

Embodiment 3

[0032] Synthesis of Long-chain Branched Polylactic Acid by Two-step Functional Group Reaction Combined with Linear Enantiomer Polylactic Acid

[0033] Add 100 parts by weight of linear polylactic acid resin and 5.3 parts of linear enantiomer polylactic acid to an internal mixer with a rotation speed of 20 rpm at 250 ° C, and add 0.16 parts of 1,3,5-trimethyl- 2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, 0.26 parts of pyromellitic dianhydride, 0.52 parts of triglycidyl isocyanuric acid, mixed 2 Minutes; then the internal mixer was raised to 100rpm, melt blending until the end of the reaction, that is, stop after about 5.5 minutes, to obtain long-chain branched polylactic acid. The melt index test results are shown in Table 1.

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Abstract

The invention discloses a method for preparing a long-chain branch polylactic acid resin by combination of a two-step function group reaction and a linear enantiomer polylactic acid. The method comprises the following steps of carrying out melting of a linear polylactic acid resin and a linear enantiomer polylactic acid, adding an anti-oxidant, an anhydride polyfunctional monomer and an epoxy polyfunctional monomer into the melted linear polylactic acid resin and the linear enantiomer polylactic acid, uniformly mixing, and carrying out melt blending until a reaction is finished to obtain the long-chain branch polylactic acid resin. The method has the advantages that a polylactic acid material having obviously improved melt strength is obtained by a two-step function group reaction having a fast high-temperature reaction rate in the presence of a less amount of a linear enantiomer polylactic acid so that good foaming film-blowing processing molding effects are obtained; and through adjustment of use ratios of two functional monomers and adjustment of linear enantiomer polylactic acid content and reaction conditions, a branching degree is controlled to a certain degree.

Description

technical field [0001] The invention relates to the technical field of polymer processing, and furthermore, relates to a method for preparing long-chain branched polylactic acid resin by combining two-step functional group reaction and linear enantiomer polylactic acid. 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 resin 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. Its development and use process fully realizes the natural cycle, and truly meets 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 thermoplasticity, good resilience and cu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/91C08G63/06
Inventor 刘建叶乔金樑张师军郭梅芳张丽英白弈青王海波
Owner CHINA PETROLEUM & CHEM CORP
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