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Method for synthesizing polyaspartic acid derivative through multi-component evaporative crystallization copolymerization modification

A technology of polyaspartic acid and copolymerization modification is applied in the field of synthesis of polyaspartic acid derivatives, which can solve the problems of high crystallinity, low scale inhibition rate of polyaspartic acid, and polyaspartic acid particles. Large diameter and other problems, to achieve the effect of reducing crystallinity and excellent scale inhibition performance

Inactive Publication Date: 2011-11-23
HEILONGJIANG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the problems of large particle size of polyaspartic acid particles, high crystallinity and low scale inhibition rate of polyaspartic acid in the existing solid-phase heat shrinkage polymerization method, and provides multi-component evaporative crystallization copolymerization improvement. Method for synthetic polyaspartic acid derivatives

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  • Method for synthesizing polyaspartic acid derivative through multi-component evaporative crystallization copolymerization modification
  • Method for synthesizing polyaspartic acid derivative through multi-component evaporative crystallization copolymerization modification

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specific Embodiment approach 1

[0010] Specific embodiment 1: The method for synthesizing polyaspartic acid derivatives by multi-component evaporative crystallization copolymerization modification in this embodiment is carried out according to the following steps: 1. Pretreatment: mixing L-aspartic acid and L-serine amino acid Dissolve in distilled water to make a mixed solution, heat and stir the mixed solution at 200°C until the liquid is completely evaporated, and the solid is precipitated, and then the solid is dried in a constant temperature oven at 80°C to constant weight to obtain a sample; 2. Take steps 1. Heating the prepared sample to 180-240°C at a heating rate of 2-4°C / min, and then reacting for 1-6h under the condition of a stirring rate of 50-100r / min to obtain polysuccinimide derivatives; 3. After cooling the polysuccinimide derivative to room temperature, add 0.5mol / L sodium hydroxide solution dropwise until the pH value is 10-12 to obtain a polyaspartic acid sodium salt solution; 4. Add hydr...

specific Embodiment approach 2

[0013] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the mass concentration of L-aspartic acid in the mixed solution in Step 1 is 90%. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0014] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the mass concentration of L-serine amino acid in the mixed solution in Step 1 is 10%. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a method for synthesizing polyaspartic acid derivative through multi-component evaporative crystallization copolymerization modification, relates to a method for synthesizing the polyaspartic acid, and solves the technical problems of large particle diameter of polyaspartic acid particles, high crystallinity and low scale inhibition rate of the polyaspartic acid prepared with the conventional solid-phase pyrocondensation polymerization method. The method comprises the following steps of: pretreating: dissolving L-aspartic acid and L-serine in distilled water, heating to separate solid out and drying to obtain a sample; heating the sample and reacting under stirring to obtain a polysuccinimide derivative; cooling to room temperature and dropwise adding a sodium hydroxide aqueous solution to obtain a polyaspartic acid sodium salt solution; dropwise adding a hydrochloric acid solution and absolute ethanol until precipitate is obtained; standing to remove supernatant; and drying precipitate in a drying box to constant weight so as to obtain the polyaspartic acid derivative, wherein the yield of the sample obtained by pretreatment reaches 95-100 percent, the particle diameter of the particles is small, and the crystallinity is high. The polyaspartic acid derivative has the scale inhibition rate of 92-93 percent and is applied to the field of scale inhibitors.

Description

technical field [0001] The invention relates to a method for synthesizing polyaspartic acid derivatives. Background technique [0002] Polyaspartic acid is an environmentally friendly green scale inhibitor with excellent scale inhibition and dispersion properties. Mainly use L-aspartic acid as raw material for solid phase thermal condensation polymerization, which has the advantages of high conversion rate and no pollution. Since solid L-aspartic acid is in the state of ionic crystals, the particle size is large, the degree of crystallinity is high, and the internal structure is dense, resulting in slow heat transfer, uneven reaction, and high energy consumption in the solid-phase thermal shrinkage polymerization reaction, which ultimately affects polytechnics. Particic acid scale inhibition performance. Contents of the invention [0003] The present invention aims to solve the problems of large particle size of polyaspartic acid particles, high crystallinity and low sca...

Claims

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Application Information

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IPC IPC(8): C08G73/10C02F5/12
Inventor 杨士林王博
Owner HEILONGJIANG UNIV
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