Production process of dendritic polyamidoamine

Abstract

The invention belongs to a production process of a dendritic polymer, in particular to a production process of a dendritic polyamidoamine. The reaction temperature is precisely controlled by a low-temperature circulator. The initial reaction temperature is controlled at about -5±2°C, and after the addition of materials, the reaction temperature is controlled at 20±2°C to make the reaction more stable, and the appropriate excess monomer ratio can be adjusted to reduce the generation of by-products. , cooperate with ton-scale industrial synthesis reactor to realize industrial production scale; for the first time, continuous feeding and discharging rotary evaporation equipment is used to purify dendrimeric polyamidoamine to improve purification efficiency; The raw materials are recovered and purified to obtain reusable raw materials, which further reduces the cost of raw materials in industrial production.

Description

technical field [0001] The invention belongs to a chemical synthesis process of a dendritic polymer, in particular to a production process of a dendritic polyamidoamine. Background technique [0002] Dendritic polyamidoamine is a kind of dendritic polymer, which has a highly branched molecular structure and a large number of surface functional groups. With the increase of algebra, the molecular structure becomes spherical, and there are cavities in the molecule. The molecule has a nanometer size, and its special The synthetic method makes it have a monodisperse molecular weight distribution. [0003] Synthesis of dendritic polyamidoamines in the prior art is in the laboratory with amines (such as ethylenediamine, ammonia, hexamethylenediamine, diethylenetriamine, etc.), acrylates (such as methyl acrylate, ethyl acrylate, etc.) ) as the raw material through Michael addition reaction and amidation alternating reaction to prepare dendrimers with different algebraic numbers and...

AI Technical Summary

Problems solved by technology

[0021] There are following shortcomings in the above laboratory preparation method, which limits the possibility of its suitability for industrialized production:

[0022] 1. The reactions are all carried out in laboratory flasks, and the low temperature control uses an ice bath. The temperature is not easy to control, the operation is troublesome, and the products required by the industrial scale cannot be obtained;

[0023] 2. A large excess of raw materials (generally 50-100 times the excess of raw material amines and 2-5 times the excess of acrylates in traditional processes), resulting in increased manufacturing costs, high product prices, and low production capacity, making it difficult to promote industrialization;

[0024] 3. Toluene, a toxic solvent, is used as an entrainer in the purification process, which is used in large quantities, resulting in increased purification costs, which is not good for the health of operators, and toluene residues are not environmentally friendly and affect product quality;

[0025] 4. There is no process for purification, recycling and reuse of waste liquid, resulting in a large waste of raw materials and high costs;

[0026] 5. Simply use the small rotary steamer in the traditional laboratory for purification. Repeated purification requires repeated disassembly operations, which will accelerate equipment loss, affect production efficiency, and limit its industrialization

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