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Recyclable castor oil-based unsaturated polyester Vitrimer material based on dynamic disulfide bond and preparation method of recyclable castor oil-based unsaturated polyester Vitrimer material

A castor oil-based, disulfide bond technology, applied in the field of Vitrimer materials, can solve the problems of unsustainable recycling and reuse of thermoplastic materials such as mechanical properties, and achieve the effect of sustainable recycling, high yield and abundant resources

Active Publication Date: 2021-07-20
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solving the problem of unsustainable recycling of traditional thermosetting unsaturated polyester materials and the poor mechanical properties of thermoplastic materials is of great significance for promoting the sustainable development of thermosetting polymer materials

Method used

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  • Recyclable castor oil-based unsaturated polyester Vitrimer material based on dynamic disulfide bond and preparation method of recyclable castor oil-based unsaturated polyester Vitrimer material
  • Recyclable castor oil-based unsaturated polyester Vitrimer material based on dynamic disulfide bond and preparation method of recyclable castor oil-based unsaturated polyester Vitrimer material
  • Recyclable castor oil-based unsaturated polyester Vitrimer material based on dynamic disulfide bond and preparation method of recyclable castor oil-based unsaturated polyester Vitrimer material

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Experimental program
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Effect test

preparation example Construction

[0035] A kind of preparation method based on the recyclable castor oil base unsaturated polyester Vitrimer material of dynamic disulfide bond, is characterized in that, comprises the following steps:

[0036] Step 1: Preparation of methacrylated castor oil

[0037] Mix and stir 1 part of castor oil, 3-4 parts of triethylamine and 0.01-0.05 parts of catalyst 4-dimethylaminopyridine at 25 °C for 0.5-1 h; then pass inert gas into the sealed system, and slowly Add 3-4 parts of methacrylic anhydride dropwise. After the dropwise addition, the reaction system is heated up to 45 °C and kept warm for 20-24 h; after the reaction, first extract with dichloromethane, and then separate the organic phase Wash with saturated sodium bicarbonate solution, 0.5-1 mol / L NaOH, 0.5-1 mol / L HCl, and saturated brine; finally dry with anhydrous magnesium sulfate, filter with suction, and remove dichloromethane by rotary evaporation under reduced pressure, namely This gives castor oil methacrylate.

[...

Embodiment 1

[0045] Preparation of a recyclable castor oil-based unsaturated polyester Vitrimer material based on dynamic disulfide bonds:

[0046] Step 1: Preparation of methacrylated castor oil

[0047] Mix and stir 1 part of castor oil, 3 parts of triethylamine and 0.02 parts of catalyst 4-dimethylaminopyridine at 25 °C for 0.5 h; then pass argon gas into the closed system, and slowly add 3 parts of methyl Acrylic anhydride, after the dropwise addition, make the reaction system warm up to 45 ° C and keep the temperature for 20 h; / L NaOH, 0.5 mol / L HCl, and saturated saline for washing; finally, dry over anhydrous magnesium sulfate, filter with suction, and rotary evaporate under reduced pressure to remove dichloromethane to obtain castor oil methacrylate.

[0048] Step 2: Synthesis of epoxidized methacrylate castor oil

[0049] Mix 1 part of methacrylate castor oil synthesized in Step 1 and 6 parts of formic acid into a three-necked flask equipped with a stirring device, and stir at ...

Embodiment 2

[0053] Preparation of a recyclable castor oil-based unsaturated polyester Vitrimer material based on dynamic disulfide bonds:

[0054] Step 1: Preparation of methacrylated castor oil

[0055] 1 part of castor oil, 3.5 parts of triethylamine and 0.03 parts of catalyst 4-dimethylaminopyridine were mixed and stirred for 0.5 h at 25 °C; then argon gas was introduced into the closed system, and 3.5 parts of methacrylic acid was slowly added dropwise anhydride, after the dropwise addition, the reaction system was warmed up to 45 °C and kept warm for 22 h; after the reaction was finished, the initial product was first extracted with dichloromethane, and then the organic phase was respectively washed with saturated sodium bicarbonate solution, 0.5 mol / Wash with L NaOH, 0.5 mol / L HCl, and saturated brine; finally dry with anhydrous magnesium sulfate, filter with suction, and rotary evaporate under reduced pressure to remove dichloromethane to obtain methacrylate castor oil.

[0056] ...

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Abstract

The invention provides a recyclable castor oil-based unsaturated polyester Vitrimer material based on dynamic disulfide bonds and a preparation method thereof. The preparation method comprises the following steps: firstly, synthesizing castor oil-based unsaturated polyester matrix resin from natural and renewable castor oil through a two-step method of methacrylic anhydride esterification and peroxyformic acid epoxidation; and allowing the castor oil-based unsaturated polyester Vitrimer material and a curing agent containing reversible dynamic disulfide bonds to be subjected to an epoxy ring-opening reaction by adopting a gradient curing strategy to obtain the castor oil-based unsaturated polyester Vitrimer material containing the dynamic disulfide bonds. The obtained material has sustainable cyclic utilization and excellent mechanical properties; and the problems that a traditional petroleum-based unsaturated polyester material cannot be recycled and raw materials are derived from non-renewable petroleum resources are solved, and the method has important significance on sustainable utilization of a thermosetting high polymer material.

Description

technical field [0001] The invention belongs to the technical field of Vitrimer materials, and in particular relates to a preparation method of castor oil-based Vitrimer materials based on dynamic disulfide bonds. Background technique [0002] Traditional thermosetting unsaturated polyester polymer materials exhibit excellent mechanical properties and thermal stability due to the three-dimensional crosslinked network in their molecular structure. However, once these unsaturated polyester resins are cross-linked and solidified, they will form permanent irreversible covalent bonds, showing the characteristics of insolubility and infusibility, making it difficult to melt, reshape and reprocess, chemically recycle and reuse, and self-repair, making them Difficult to recycle. At present, such materials are mainly disposed of by crushing as filler, incineration or landfill. These three treatment methods will cause certain environmental pollution and waste of resources. In additi...

Claims

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Application Information

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IPC IPC(8): C08L91/00C08K5/36C08G59/32C08G59/50
CPCC08K5/36C08G59/32C08G59/504C08L91/00
Inventor 张跃宏翟梦姣吕斌纪拓雷秦阳
Owner SHAANXI UNIV OF SCI & TECH
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