A kind of bio-based long carbon chain polyamide and its synthesis method

Abstract

The invention relates to biomass-based long carbon chain polyamide and a synthesis method thereof. Biomass-based 1,9-azelaic acid prepared from renewable vegetable oil and 1,12-dodecacarbonyl diamide are taken as monomers, and under a normal pressure condition, directly undergo melt polycondensation reaction to synthesize biomass-based poly azelaic acid dodecyl diamide, i.e., PA129. In a synthesis process, no organic solvent is added, environment-friendliness, convenience for operation and easiness for management and control are achieved, the raw material consumption and the production cost are greatly reduced, and the polymerization efficiency and the safety are improved. In addition, the biomass-based long carbon chain poly azelaic acid dodecyl diamide can be used as engineering plastics, a fiber, a membrane material and the like, and can be widely applied to the fields of automobile parts, textiles and garments, medical devices, machinery manufacturing, sports goods and the like.

Description

technical field [0001] The invention belongs to the field of synthesis of bio-based polymer materials, in particular to a bio-based long carbon chain polyamide and a synthesis method thereof, in particular to a bio-based polydodecane azelaic acid amide and a synthesis method thereof. Background technique [0002] Polyamide, referred to as PA, is called nylon in the industry, and has been developed for more than 80 years. With its excellent comprehensive performance, polyamide ranks first in the world's top five engineering plastics, and is also the world's second largest fiber material after polyester fiber (polyester). [0003] Generally, polyamides whose main molecular chain contains more than 10 carbon chains can be called long carbon chain polyamides. Although, in the 1930s and 1940s, short-chain polyamides represented by PA6 and PA66 were applied on a large scale, and their output still accounts for more than 90% of the global polyamide production and consumption today...

AI Technical Summary

Problems solved by technology

The disadvantages of the above method are: on the one hand, the use of ethanol as a solvent is not as clean and environmentally friendly as water. After the monomer reaction to salt reaction is completed, subsequent processing operations such as low-temperature cooling, rotary evaporation, and drying are required in the later stage.

The operation steps and technological process are complicated, which is not conducive to environmental protection and also increases the difficulty of post-processing work.

On the other hand, during the heat preservation and pressure holding stage of the polycondensation reaction, exhaust operation needs to be carried out under high temperature and high pressure conditions. The monomer escape in the system is serious, and the monomer ratio is out of balance.

Therefore, in the reaction process, the general diamine monomer needs to be in excess of about 5%, and the excess monomer will play a role in capping, resulting in a decrease in the molecular weight and performance of the polymer.

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