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Preparation method of polylactic acid grafted copolymer

A technology of graft copolymer and polylactic acid, which is applied in the field of preparation of polylactic acid graft copolymer by solid-phase grafting method, can solve the problems of affecting the grafting rate of the product, affecting the grafting reaction, and material agglomeration, and achieves easy reaction Control, high product grafting rate, and reduce the loss of initiator

Active Publication Date: 2016-05-04
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional solid phase grafting method has been reported in the graft modification of polyolefins, but it has not been reported in the graft modification of polylactic acid, and the solid phase grafting method used for polyolefin graft modification Process conditions are likely to cause serious agglomeration of materials, which affects the progress of grafting reaction, thereby affecting the grafting rate of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Raise the temperature of the reactor to 90°C, start stirring, add 20g of polylactic acid powder into the reactor, then add 4.8g of maleic anhydride, 3.2g of methyl methacrylate, and 0.8g of butyl acrylate, and stir for 5 minutes. Add 1g of phthaloyl peroxide, react for 1 hour, raise the temperature to 100°C, continue the reaction for 1 hour, raise the temperature to 110°C and continue the reaction for 0.5 hours. After the reaction, polylactic acid, maleic anhydride, methyl methacrylate, The graft copolymer of butyl acrylate has a graft rate of 21.8%, and the film of the graft copolymer has a degradation rate of 9.3% in 15 days in water.

Embodiment 2

[0036] Raise the temperature of the reactor to 90°C, start stirring, add 20g of polylactic acid powder into the reactor, then add 4.8g of glycidyl methacrylate, 3.2g of styrene, and 0.8g of butyl acrylate, and stir for 10 minutes. Add 1g of phthaloyl peroxide, react for 0.5 hours, raise the temperature to 100°C, continue the reaction for 0.5 hours, raise the temperature to 110°C and continue the reaction for 1 hour. After the reaction, polylactic acid, glycidyl methacrylate, styrene, The graft copolymer of butyl acrylate has a graft rate of 22.3%, and the film of the graft copolymer has a degradation rate of 8.6% in 15 days in water.

Embodiment 3

[0038] Raise the temperature of the reactor to 90°C, start stirring, add 20g of polylactic acid powder into the reactor, then add 3.2g of maleic anhydride, 3.2g of styrene, stir for 5 minutes, add 0.8g of phthaloyl peroxide After 1 hour of reaction, the temperature was raised to 100°C, the reaction was continued for 1 hour, and the temperature was raised to 110°C to continue the reaction for 0.5 hour. After the reaction, a graft copolymer of polylactic acid, maleic anhydride, and styrene was obtained, and the grafting rate was 17.1%. , the degradation rate of the film of the graft copolymer in water for 15 days was 9.7%.

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Abstract

The invention discloses a preparation method of a polylactic acid grafted copolymer. Polylactic acid is used as a raw material and reacts with a grafted monomer through a solid phase grafting method under the effect of an initiator. The preparation method is characterized by specially comprising the steps that the temperature of a reactor with a stirring function is increased to 60-90 DEG C, polylactic acid, the grafted monomer and the initiator are added in, stirring is carried out for 5-20 min, and a reaction is carried out for 1-3 h; the temperature is increased to 100-110 DEG C, and the reaction continues to be carried out for 0.5-1 h; the temperature is increased to 110-120 DEG C, the reaction continues to be carried out for 0.5-1 h, and therefore the polylactic acid grafted copolymer is obtained. The polylactic acid is grafted and modified through the solid phase grafting method, the grafting reaction is carried out in a solid powder shape or granular shape through the gradual heating mode, the reaction temperature is low, the reaction is easy to control, the product grafting ratio is high, and the prepared grafted copolymer not only has the interface capacity increasing effect, but also has the complete degradation performance, and can be used as functional polymer materials such as an interface compatilizer of polylactic acid based composite materials.

Description

technical field [0001] The invention relates to a preparation method of a polylactic acid graft copolymer, in particular to a method for preparing a polylactic acid graft copolymer by a solid phase grafting method. Background technique [0002] Polymer-based composites can combine the advantages of different materials and are an important means of high-performance polymers. Traditional polymer-based composites use polymer materials derived from fossil resources as the matrix, glass fiber, carbonic acid Inorganic materials such as calcium, talcum powder, and montmorillonite are used as raw materials. These substrates and raw materials do not have biodegradability. Therefore, polymer-based composite materials basically do not have biodegradability and have no effect on environmental protection. In order to prepare biodegradable polymer-based composite materials, the use of ecological composite materials with biopolymers such as polylactic acid as the matrix and natural plant f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/02C08F222/06C08F220/14C08F220/18C08F220/32
CPCC08F283/02C08F220/1804C08F220/32
Inventor 洪浩群刘灏张海燕
Owner GUANGDONG UNIV OF TECH
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