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

A technology of long-chain branched polylactic acid and polylactic acid resin, which is applied in the field of preparation of long-chain branched polylactic acid resin by the combination of functional group reaction and linear enantiomer polylactic acid, can solve the problems of low production efficiency of long-chain branched polylactic acid, and achieve Significant branching effect, increased degree of long branching, and high melt strength

Active Publication Date: 2015-07-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of low production efficiency in the preparation of long-chain branched polylactic acid in the melt reaction process in the prior art, the present invention provides a combination of functional group reaction and linear enantiomer polylactic acid to prepare long-chain branched polylactic acid resin method

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0024]Functional group reaction combined with linear enantiomer polylactic acid to prepare long-chain branched polylactic acid Add 100 parts by weight of linear polylactic acid resin and 5.3 parts of linear enantiomer polylactic acid to an internal mixer at 250°C with a rotation speed of 20rpm, After it melted at constant temperature, add 0.16 parts of 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, 0.34 parts of N, N,N',N'-tetraglycidyl-4,4'diaminodiphenylmethane, mix for 2 minutes; then increase the internal mixer to 100rpm, melt blend until the reaction is complete, that is, stop after about 3.5 minutes , to produce 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.

Embodiment 2

[0026] Synthesis of Long-chain Branched Polylactic Acid by Functional Group Reaction and Linear Enantiomer Polylactic Acid

[0027] 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 250 ° C, and add 0.17 parts of 1,3,5-trimethyl -2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, 0.36 parts of N,N,N',N'-tetraglycidyl-4,4'di Aminodiphenylmethane, mixed for 2 minutes; then the internal mixer was raised to 100rpm, and blended until the reaction was completed, and stopped after about 3.5 minutes to obtain long-chain branched polylactic acid. The melt index test results are shown in Table 1. 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 change curve with frequency see figure 2 .

Embodiment 3

[0029] Synthesis of Long-chain Branched Polylactic Acid by Functional Group Reaction and Linear Enantiomer Polylactic Acid

[0030] 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 then add 0.16 parts of 1,3,5-trimethyl -2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, 0.55 parts of N,N,N',N'-tetraglycidyl-4,4'di Aminodiphenylmethane, mixed for 2 minutes; then the internal mixer was raised to 100rpm, and blended until the reaction was completed, and stopped after about 3.5 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-branch chain polylactic resin by combination of a function group reaction and a linear enantiomer polylactic acid. The method comprises the following steps that a linear polylactic acid resin and a linear enantiomer polylactic acid are molten; the melt, an antioxidant and an epoxy polyfunctional monomer are mixed uniformly; and the mixture is subjected to melt blending until a reaction is finished so that the long-branch chain polylactic resin is obtained, wherein 1 to 11.1 parts of the linear enantiomer polylactic acid and 0.1 to 1 part of the epoxy polyfunctional monomer are used. Through utilization of a function group reaction having a high reaction rate at a high temperature, under the condition of a small amount of the linear enantiomer polylactic acid, the long-branch chain polylactic resin as a polylactic acid material of which melt strength is improved obviously is obtained. The long-branch chain polylactic resin has good foaming film-blowing molding effects. Through adjustment of a use amount of the epoxy polyfunctional monomer, the content of the linear enantiomer polylactic acid and reaction conditions, the method realizes branching degree control to a certain degree.

Description

technical field [0001] The invention relates to the field of polymer processing, and more particularly relates to a method for preparing long-chain branched polylactic acid resin by combining 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 curl durability,...

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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