Polysuccinimide CAS 5608-40-6 PSI

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  • Appearance: Yellow powder
  • Purity: 99. 0%min
  • Stock: In stock
  • Sample: Available
  • Zhishang Chemical: Polysuccinimide Supplier & Manufacturer

Basic Info

What is Polysuccinimide?

Polysuccinimide (PSI) is the main raw material for the synthesis of polyaspartic acid (PASP), and its synthetic routes mainly include the following three: polysuccinimide (PSI) is formed by thermal condensation of aspartic acid as raw material; Using concentrated phosphoric acid as a catalyst, aspartic acid is polymerized under reduced pressure under the action of concentrated phosphoric acid to obtain high-purity polysuccinimide; using a small amount of catalyst, the reaction is carried out in a mixed solvent of 1,3,5-trimethylbenzene/sulfolane Synthesis of polysuccinimide. Wherein the first route has a longer reaction time, and requires a higher reaction temperature, and its product molecular weight is also smaller; the second route has more impurities in the product, which is not convenient for product separation; the third route has insufficient industrial applicability.

Polysuccinimide Uses

Polysuccinimide was developed by Bayer AG and developed by Lanxess AG ® DSP brand sales, with an average molecular weight of 4400 g/mol, will be partially hydrolyzed even at slightly elevated pH, so it can be in the form of swelling or water-soluble linear form in a highly cross-linked environment. Copolymer – (succinimide aspartic acid) formed by partial hydrolysis, especially polyaspartic acid (trade name: Baycure) produced by partial hydrolysis ® DS 100) is suitable for use as a long-term inhibitor of scale deposition in water treatment, as well as in oil and mining application industries, and as a retarder of cement in construction industry. The patent literature mentions the application of polysuccinimide as a chelating agent, scale inhibitor, dispersant, humectant and fertilizer additive.

The pyrrolidine diketone ring structure in polysuccinimide is opened by ammonolysis of ammonia (containing NH 4 OH) to form polyimide-( α,β)- DL asparagine, poly with hydrazine-( α,β)- DL aspartic hydrazide (PAHy) and polyamine with functional amine, such as ethanolamine-( α),β)- DL-2-hydroxyethyl aspartic acid (PHEA). PHEA can be used as a plasma expander with good biocompatibility and biodegradability, high water solubility and low manufacturing cost, and has been further studied in medical applications as a potential drug carrier.

Crosslinking polymerization( α, β)- DL aspartic acid sodium salt is the most concerned polysuccinimide derivative in commerce. Compared with non-biodegradable standard cross-linked sodium polyacrylate, its applicability as a biodegradable super absorbent has been widely tested. The results obtained have not yet led to the use of cross-linked polyaspartic acid in a large number of applications of super absorbents (such as baby diapers).

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Application of Polysuccinimide

Polysuccinimides, when hydrolyzed to the corresponding poly(amino acids), are useful as absorbents, hard surface cleaners, boiler water and cooling tower water treatment additives, and as detergency builders, antifilming agents, dispersants , sequestrant and encrustation inhibitor action detergent additive. Application examples are as follows:

The polyaspartic acid bentonite composite material is prepared from polysuccinimide, bentonite and silane crosslinking agent; the mass ratio of bentonite to polysuccinimide is 1:0.1-10, and the mass of silane crosslinking agent is 1-10% of the mass of polysuccinimide; polysuccinimide is made from maleic acid and liquid ammonia with a mass ratio of 1:0.9-1.7. First of all, the present invention uses liquid ammonia as a nitrogen source in the process of preparing polysuccinimide, which enriches the nitrogen source in the preparation process of polysuccinimide and improves the utilization efficiency of nitrogen; secondly, bentonite is used as raw material, and the cost Low cost, excellent performance, and polyaspartic acid is an environmentally friendly material, which can be degraded by microorganisms and fungi into small amino acid molecules, and finally produce water and carbon dioxide that are harmless to the environment.

The method takes polysuccinimide as raw material, prepares crosslinked polysuccinimide by heterogeneous suspension emulsion crosslinking method or heterogeneous suspension crosslinking method, and prepares polyaspartic acid resin through hydrolysis, and is characterized in that : The preparation of cross-linked polysuccinimide is a multi-stage cross-linking reaction, which is realized by feeding the cross-linking agent in 2 to 4 times at equal intervals; the cross-linked polysuccinimide and polyaspartic acid resin are processed Aging crystallization treatment and rapid drying treatment; (A) aging crystallization treatment: aging crystallization at room temperature for 1-10 days; (B) rapid drying treatment: performing at -54-40°C. In addition to biodegradability and biocompatibility, the polyaspartic acid resin prepared by the invention also has the characteristics of good water absorption, gel strength, pH buffering capacity and salt resistance.

  1. At first utilize thermal polycondensation reaction to make polysuccinimide, promptly take L-aspartic acid as raw material, take phosphoric acid as catalyst, take the mixed solvent of sulfolane and 1,3,5-trimethylbenzene as reaction solvent, in Carry out heating reaction under nitrogen atmosphere, then dissolve product with DMF, then precipitate in methanol, centrifuge, wash, dry.
  2. Use sodium alkoxide as a nucleophile to attack polysuccinimide for ring-opening reaction, that is, dissolve polysuccinimide in DMF, add sodium alkoxide solution dropwise to the solution, then precipitate in acetone, pump After filtering, washing and drying, the solid product poly(α,β-L-aspartic acid ester) was obtained.

The advantages of the present invention are: the preparation method is simple and convenient to synthesize, easy to implement, and has low manufacturing cost, and the prepared poly(α,β-L-aspartic acid) contains relatively high α-structure, and can be widely used in the field of biomedicine.

Preparation of Polysuccinimide

Method 1: Weigh a certain amount of maleic anhydride (maleic anhydride or maleic anhydride) and put it into a 250mL four-neck flask equipped with a thermometer, agitator, and condenser tube, add a certain amount of ammonia water in proportion to start the agitator, and at the same time Pass cooling water. The reaction starts to emit a lot of heat, and when the temperature is about 60°C, a milky white turbid liquid is obtained. Continue to stir evenly for a period of time, the suspended matter is completely dissolved, and becomes a clear and slightly yellow homogeneous solution. After adding ammonia water, the temperature can rise to about 90°C. Then cool down to reduce the temperature to about 60-70°C and keep it warm for 1 hour, then raise the temperature to about 90°C. At this time, remove the condenser tube to evaporate water molecules and excess ammonia molecules. Continue to heat up, the reaction solution becomes turbid at 120°C, and the catalyst is added, after a period of time the solution turns light red, then orange, and the viscosity increases. After a period of time, raise the temperature to above 150°C, keep it warm for 40-50 minutes, and cool to room temperature to obtain a brittle orange-yellow solid, that is, polysuccinimide.

Method 2: 6.3g L-Asp, 0.56g phosphoric acid (85%) were mixed and ground and added to a 150mL three-neck flask, then a small amount of glass beads were added to increase the stirring, and then 6g sulfolane and 14g 1,3,5-trimethylbenzene were added as a mixture Reaction solvent. Nitrogen was passed at room temperature for 15 minutes, and stirring was increased to make L-Asp evenly suspended and dispersed in the mixed solvent. The temperature was raised under nitrogen protection. At the beginning of the reaction, L-Asp was dispersed in the solvent as white crystals, and then As the temperature rises, a large number of light yellow lumps are formed, which are refluxed at 180°C for 4.5h. After the reaction is completed, filter and separate the product, wash the product with acetone for 3 times, and remove the sulfolane and 1,3,5- Trimethylbenzene, then dissolve the product with an appropriate amount of DMF, filter to remove unreacted L-Asp, precipitate the filtrate with deionized water, filter with suction, and wash the product with deionized water until neutral. The product is dried in an oven at 85°C under normal pressure , as a white powdery solid.


  1. Polysuccinimide – WikiPedia
  2. CN200610002080.X A preparation method of polyaspartic acid resin

Polysuccinimide Supplier and Manufacturer

As a polysuccinimide supplier and manufacturer with a strict standard product quality system certificate, Zhishang Chemical has long been providing the best polysuccinimide raw materials to customers all over the world.

Over the years, relying on professional team experience and customer-centric team concept to meet customer needs in a timely manner, our company enjoys a high reputation in the world. At present, our company has served more than 6,000 customers and has established long-term cooperative relations with customers from many countries.

If you have a demand for polysuccinimide and related products, please contact our service staff Zhishang Chemical – White directly, and we will provide you with high-quality products at the best price.

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