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
  • Claims
  • 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 polyl

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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Example Embodiment

[0032] The present invention provides a method for preparing 1,2-polybutadiene rubber toughened and modified polylactic acid. Firstly, 1,2 polybutadiene (E1,2-PB) with different epoxy degrees is prepared, and then E1,2-PB with different epoxide degrees is dissolved in the lactide polymerization system. During the in-situ polymerization of lactide (polylactide (PLA) is formed, the grafting reaction with E1,2-PB occurs at the same time) , To generate PLA-g-E1,2-PB. The specific mechanism is as follows figure 1 As shown, polylactic acid is used as a matrix, PLA-g-E1,2-PB is used as a compatibilizer, and 1,2-PB is used as a toughening agent. Put polylactic acid and PLA-g-E1,2-PB, 1,2-PB in a Hack internal mixer for banburying 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: Place the dried 1,2-PB in a round bottom flask, and add toluene solvent at room temper...

Example Embodiment

[0042] Example 1

[0043] Put 0.1g of E1,2-PB with an epoxy degree of 5% and 0.9g of lactide in a test tube, add toluene solvent, and after the E1,2-PB is completely dissolved, add m-cresol-substituted triisobutyl Base aluminum (Fen / Al = 1), tributyl phosphate substituted molybdenum pentachloride catalyst (substance ratio is 3), among which lactide: aluminum catalyst: molybdenum catalyst is based on lactide: aluminum element : The amount ratio of the substance in terms of molybdenum is 1000:30:1, the concentration of lactide is 1mol / L, the reaction is 10h, the polymerization temperature is 100℃, and PLA-g-E1,2-PB5 is obtained (the number 5 represents the ring The degree of oxygen is 5%), and the 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 5% epoxy degree and 9g of lactide in a test tube, add toluene solvent, after E1,2-PB ...

Example Embodiment

[0045] Example 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 Triisobutyl aluminum (Fen / Al=0.5) substituted with methyl acetophenone, molybdenum pentachloride catalyst substituted with tripropyl phosphate (substance ratio 2.5), of which lactide: aluminum catalyst: molybdenum The catalyst is based on the ratio of lactide: aluminum element: molybdenum element to be 1300:40:1, the concentration of lactide is 0.8mol / L, the reaction is 9h, the polymerization temperature is 90℃, and PLA-g- The conversion rate of E1,2-PB10 was 54%.

[0047] Put 1g of E1,2-PB with 10% epoxy degree and 9g of lactide in a test tube, add toluene solvent, after E1,2-PB is completely dissolved, add 2-hydroxy-4-methoxybenzene respectively Ethyl ketone substituted triisobutyl aluminum (Fen / Al=0.5), tripropyl phosphate substituted molybdenum pentachloride catalyst (substance ratio 2.5), o...

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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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