Polyamino acid composition and preparing method and application thereof
A polyamino acid and composition technology, applied in the direction of adhesive additives, polymer adhesive additives, non-polymer adhesive additives, etc., to achieve the effects of good environmental protection, simple preparation method, and easy-to-obtain raw materials
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[0043] According to the present invention, the preparation method of the linear polyamino acid (I) and branched polyamino acid (II) preferably includes the following methods:
[0044] Carrying out ring-opening polymerization of N-carboxylic acid anhydrides of one or more amino acids to obtain linear or branched polyamino acids;
[0045] Or carry out polycondensation reaction of one or more amino acids to obtain linear or branched polyamino acids;
[0046] Or one or more amino acids are fermented to obtain linear or branched polyamino acids.
[0047] According to the present invention, the preparation method to obtain linear polyamino acid or branched polyamino acid depends on the type of amino acid and the reaction conditions.
[0048] In the present invention, the temperature of the ring-opening polymerization is preferably 0-120°C; more preferably, the temperature of the ring-opening polymerization is 50-100°C; the time of the ring-opening polymerization is preferably 2 hou...
Embodiment 1
[0072] Add 1 gram of glutamic acid and 1 gram of histidine in a 50 ml round bottom flask equipped with a water separator, and heat the above substances to 180° C. for 1 hour to react. After the reaction, cool to room temperature to obtain branched polyamino acid.
Embodiment 2
[0074] For the preparation of polyglutamic acid, add 5.9g of ground L-glutamic acid and 5.2mL of benzyl alcohol into a 50mL three-necked bottle, and after mechanical stirring, slowly add 60% concentrated sulfuric acid dropwise with a constant pressure dropping funnel 4.8mL, the temperature of the oil bath was controlled at 70°C until the reaction solution became clear. Heating was stopped, and after the reaction solution dropped to normal temperature, it was added to 6.5 g of sodium bicarbonate in ice water. After filtration, the crude product was recrystallized with distilled water at 70°C to obtain flaky crystals, washed with ethanol and ether in sequence, and dried in vacuum to obtain the white product γ-benzyl-L-glutamic acid.
[0075] Add 1 g of γ-benzyl-L-glutamic acid into 10 mL of anhydrous tetrahydrofuran, add 0.5 g of triphosgene while stirring, and react in an oil bath at 50-60°C for 3 hours, and use nitrogen gas bubbles during the reaction to remove the generated ...
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