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Method for preparing 1,2-polybutadiene rubber toughened modified polylactic acid

A technology of polybutadiene rubber and polybutadiene, which is applied in the field of rubber toughening modified plastics, can solve problems such as strength decline, and achieve the effects of improving toughness, reducing the magnitude of strength decline, and high motion matching

Active Publication Date: 2019-11-05
QINGDAO UNIV OF SCI & TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

In this method, polylactic acid is toughened and modified by 1,2-polybutadiene containing more side methyl groups, in order to improve the phase between 1,2-polybutadiene rubber (1,2-PB) and polylactic acid. Compatibility differences, prepared polylactide (PLA) grafted epoxidized 1,2 polybutadiene as a compatibilizer; improved the problem of a sharp drop in strength after rubber toughened polylactic acid, and provided rubber toughened polylactic acid Provides a feasible and effective new method

Method used

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  • Method for preparing 1,2-polybutadiene rubber toughened modified polylactic acid
  • Method for preparing 1,2-polybutadiene rubber toughened modified polylactic acid
  • Method for preparing 1,2-polybutadiene rubber toughened modified polylactic acid

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preparation example Construction

[0032] The invention provides a preparation method of polylactic acid toughened and modified by 1,2-polybutadiene rubber. First, 1,2 polybutadiene (E1,2-PB) with different epoxy degrees is prepared, and then E1,2-PB with different epoxy degrees is dissolved in the lactide polymerization system. During the in-situ polymerization of lactide (generation of polylactide (PLA), the grafting reaction with E1,2-PB occurs simultaneously. , generate PLA-g-E1,2-PB. Its specific mechanism is as follows figure 1As shown, polylactic acid is used as the matrix, PLA-g-E1,2-PB is used as the compatibilizer, and 1,2-PB is used as the toughening agent. The polylactic acid, PLA-g-E1,2-PB, and 1,2-PB were placed in a Haake mixer for internal mixing to obtain 1,2-PB toughened and modified polylactic acid.

[0033] Among them, 1,2 polybutadiene (E1,2-PB) with different epoxy degrees can be prepared by the following method: put the dried 1,2-PB in a round bottom flask, add toluene solvent at room te...

Embodiment 1

[0043] Put 0.1g of E1,2-PB with 5% epoxy degree and 0.9g of lactide in a test tube, add toluene solvent, after E1,2-PB is completely dissolved, add m-cresol substituted triisobutyl Base aluminum (Fen / Al=1), the molybdenum pentachloride catalyst (mass ratio is 3) that tributyl phosphate replaces, wherein, lactide: aluminum series catalyst: molybdenum series catalyst presses lactide: aluminum element : The molar ratio of the molybdenum element is 1000:30:1, the concentration of lactide is 1mol / L, the reaction is 10h, and the polymerization temperature is 100°C to obtain PLA-g-E1,2-PB5 (number 5 represents ring Oxygen degree is 5%), and its conversion rate is 62%. Such as figure 2 In order to obtain the infrared spectrum of PLA-g-E1,2-PB5, the results proved that PLA-g-E1,2-PB5 was successfully synthesized.

[0044] Put 1g of E1,2-PB with an epoxy degree of 5% and 9g of lactide in a test tube, add toluene solvent, and after E1,2-PB is completely dissolved, add m-cresol-substit...

Embodiment 2

[0046] Put 0.1g of E1,2-PB with 10% epoxy degree and 0.9g of lactide in a test tube, add toluene solvent, after E1,2-PB is completely dissolved, add 2-hydroxy-4-methoxy Triisobutylaluminum (Fen / Al=0.5) substituted by phenylacetophenone, tripropyl phosphate substituted molybdenum pentachloride catalyst (mass ratio is 2.5), wherein, lactide: aluminum series catalyst: molybdenum The molar ratio of the catalyst based on lactide: aluminum element: molybdenum element is 1300:40:1, the concentration of lactide is 0.8mol / L, the reaction is 9h, and the polymerization temperature is 90°C to obtain PLA-g- The conversion rate of E1,2-PB10 was 54%.

[0047] Put 1g of E1,2-PB with an epoxy degree of 10% and 9g of lactide in a test tube, add toluene solvent, after E1,2-PB is completely dissolved, add 2-hydroxy-4-methoxybenzene Triisobutylaluminum (Fen / Al=0.5) substituted by ethyl ketone, molybdenum pentachloride catalyst (mass ratio is 2.5) substituted by tripropyl phosphate, wherein, lacti...

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Abstract

The invention relates to a method for preparing 1,2-polybutadiene rubber (1,2-PB) toughened modified polylactic acid. The method comprises the following steps: firstly, dissolving 1,2-polybutadiene (E1,2-PB) into a lactide polymerization system; while polylactide (PLA) is generated, enabling E1,2-PB to react with carboxyl on a main chain of the polylactide (PLA) through epoxy groups to generate PLA-E1,2-PB; by taking the PLA-E1,2-PB as a compatilizer, blending the PLA-E1,2-PB with polylactic acid and 1,2-PB, so as to obtain the 1,2-PB toughened modified polylactic acid. Due to adoption of thecompatilizer PLA-g-E1,2-PB, the compatibility of the 1,2-PB and the polylactic acid can be improved, the 1,2-PB has good dispersibility in the polylactic acid, the strength is not greatly degraded while the toughness of the polylactic acid is improved by using the 1,2-PB, and a toughness balance can be achieved.

Description

technical field [0001] The invention relates to a preparation method of 1,2-polybutadiene rubber toughened modified polylactic acid, which belongs to the field of rubber toughened modified plastics. Background technique [0002] In recent years, the plastics industry has developed rapidly, and the demand for plastics in various countries is extremely high. But most plastic raw materials come from petroleum, which is a non-renewable resource and is currently in severe shortage. At the same time, most plastics are non-degradable, which not only pollutes the environment, but also leads to further scarcity of resources. The high strength of polylactic acid makes it have great potential to replace petrochemical materials. At the same time, the raw material of polylactic acid is extracted from renewable crops, and its products can be decomposed into carbon dioxide and water, which are completely harmless to the environment. A completely biodegradable material, which has the adva...

Claims

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Application Information

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IPC IPC(8): C08G63/08C08L67/04C08L47/00
CPCC08G63/08C08L67/04C08L2205/03C08L47/00
Inventor 华静耿洁婷付哲袁玉卡吕情情
Owner QINGDAO UNIV OF SCI & TECH
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