A kind of preparation method of unsaturated polyamide ester

Abstract

The invention discloses a preparation method of unsaturated polyesteramide. The method comprises the following steps: in the presence of inert gas, uniformly mixing diamine and an epoxy compound in an organic solvent; carrying out a reflux reaction at 0-45 DEG C for 0.5-3 hours; adding an unsaturated acid anhydride organic solution; mixing uniformly till an exothermic reaction ends; dropwise adding sulfoxide chloride; stirring to mix uniformly; controlling the temperature at 100-120 DEG C; introducing inert air current for bubbling; stopping bubbling 0.5-3 hours later; continually introducing inert gas for protecting; heating to 130-150 DEG C; distilling under reduced pressure to remove the organic solvent, volatile side products and impurities, wherein the molar ratio of acid anhydride to the diamine to the epoxy compound to the sulfoxide chloride is 1.0:(0.4-0.5):(0.4-1.2):(2.0-2.2). Unsaturated polyesteramide of various structures and non-uniform properties can be obtained by flexibly selecting raw material monomers. The method has the characteristics of high polyesterification efficiency and simple process, and is consistent with the demand of the development of environment-friendly chemical industry.

Description

technical field [0001] The invention relates to a synthesis method of a high molecular polymer, in particular to a preparation method of an unsaturated polyamide ester. Background technique [0002] Polyamide esters contain both ester bonds and amide bonds (peptide bonds), so they can combine the good mechanical properties of polyamides and the biodegradable properties of polyesters. They are used in liquid crystals, coatings, functional films, optical materials, and biomedical devices. It has broad application prospects. [0003] So far, the known methods of synthesizing polyamide ester mainly include: (1) Amic acid polyesterification method, that is, using acid anhydride and alcohol amine as raw materials, allowing the acid anhydride and alcohol amine to undergo aminolysis reaction to generate amic acid, and then make the amide Polyesterification condensation reaction of acid occurs. This method is simple in process, but its polyesterification conversion rate is low and n...

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Problems solved by technology

[0003] So far, the known methods of synthesizing polyamide ester mainly include: (1) Amic acid polyesterification method, that is, using acid anhydride and alcohol amine as raw materials, allowing the acid anhydride and alcohol amine to undergo aminolysis reaction to generate amic acid, and then make the amide Polyesterification condensation reaction of acid occurs. This method is simple in process, but its polyesterification conversion rate is low and needs to be carried out at high temperature, and high temperature is easy to decompose amic acid; (2) ester acid-acyl halide-polyamine solution method, that is Using dianhydride, diamine and halogenating agent as raw materials, the dianhydride is first esterified to form a diacid diester, and then the diacid diester is acid-halogenated, and then undergoes polyaminolysis or polyamide condensation reaction with the diamine , this method can realize polyamidation at low temperature and high conversion rate, but there are many side reactions, complicated process and high cost

In addition, the above two types of methods have a common weakness, that is, they cannot flexibly select raw material monomers: for example, the number of alcohol amines that can be selected in method (1) is very small, and can only be ethanolamine, diethanolamine, isopropanolamine or diethylamine. Isopropanolamine, or their mixtures; the number of dianhydrides available in method (2) is even rarer, usually only trimellitic anhydride and pyromellitic dianhydride, or their mixtures

[0004] The existing polyamide ester products are mainly those with high temperature resistance and high mechanical properties, and there are relatively few functional polyamide esters with low melting point and low mechanical properties.

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