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 is applied in the field of preparing long-chain branched polylactic acid resin by combining functional group reaction with linear enantiomer polylactic acid, which can solve the problems of low production efficiency of long-chain branched polylactic acid, etc. Significant branching effect, low melt index, long branching degree improvement effect

Active Publication Date: 2013-03-20
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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024]100 parts by weight of linear polylactic acid resin and 5.3 parts of linear enantiomeric polylactic acid were added to an internal mixer with a rotation speed of 20 rpm at 250°C, After being melted at a 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, mixed for 2 minutes; then the mixer was raised to 100 rpm, melt-blended until the end of the reaction, that is, stopped after about 3.5 minutes , long-chain branched polylactic acid was obtained. The results of the melt index (190° C., 2.16 kg load) of the obtained reaction product material measured according to ASTMD1238 are shown in Table 1.

Embodiment 2

[0026] Long-chain branched polylactic acid prepared by functional group reaction combined with linear enantiomer polylactic acid

[0027] 100 parts by weight of linear polylactic acid resin and 11.1 parts of linear enantiomeric polylactic acid were added to an internal mixer with a rotating speed of 20 rpm at 250 ° C, and 0.17 parts of 1,3,5-trimethyl were added successively after they were melted at a constant temperature. -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 100 rpm, and the mixture was blended until the reaction ended, and stopped after about 3.5 minutes to obtain long-chain branched polylactic acid. The melt index test results are shown in Table 1. See the torque and temperature curves in the mixer figure 1 , at 180°C and strain of 5%, the viscosity versus frequency curve is shown in figure 2 .

Embodiment 3

[0029] Long-chain branched polylactic acid prepared by functional group reaction combined with linear enantiomer polylactic acid

[0030] 100 parts by weight of linear polylactic acid resin and 5.3 parts of linear enantiomeric polylactic acid were added at 250° C. to an internal mixer with a rotating speed of 20 rpm, and 0.16 parts of 1,3,5-trimethyl were added in sequence after they were melted at a constant temperature. -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 100 rpm, and the mixture was blended until the reaction ended, 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 further 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, biomass degradable polymer materials have attracted widespread attention due to their remarkable advantages of not causing serious environmental pollution after use. Among them, the polylactic acid resin material is particularly prominent. It can not only degrade and return to nature after use, but also its source does not depend on the exploitation of oil. Its development and use process completely realizes the natural cycle and truly meets the needs of low-carbon and 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, good oil...

Claims

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Application Information

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Patent Type & Authority Applications(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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