Method for preparing short-carbon-chain nylon through polycondensation

A technology of short carbon chain and nylon, which is applied in the field of polycondensation to prepare short carbon chain nylon, which can solve the problems of inability to increase molecular weight, inability to solid-state polymerization, and residual products, and achieve stability and quality control, and improve adaptability and economy. , the effect of good formability
CN112409594AActive Publication Date: 2021-02-26ZHENGZHOU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHENGZHOU UNIV
Publication Date
2021-02-26

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Abstract

The invention belongs to the field of preparation of nylon, and particularly relates to a method for preparing short-carbon-chain nylon through polycondensation. The method for preparing the short-carbon-chain nylon through polycondensation comprises the following steps of (1) carrying out salt forming reaction on short-carbon-chain diamine and binary acid in a solvent at the temperature of 80-140DEG C under the conditions of heat preservation and pressure maintaining, and then removing the solvent to obtain dry nylon salt, 2) mixing nylon salt, an antioxidant, a catalyst, a surfactant and the pellets, and carrying out solid-phase pre-polymerization and solid-phase post-polymerization in a dynamic mixing state, in the solid-phase post-polymerization process, gradually reducing the systempressure to vacuum and keeping for at least 1 hour in a vacuum state. The temperature of the solid-phase post-polymerization is not lower than the termination temperature of the solid-phase pre-polymerization. The synthesis method solves the problem that the product is easy to cake and adhere to the wall in the industrial production process of nylon, the product is discharged in the form of powder, the melting point, intrinsic viscosity and initial thermal decomposition temperature indexes of the product are good, and the overall quality of the product is excellent.
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Description

technical field

[0001] The invention belongs to the field of nylon preparation, and in particular relates to a method for preparing short carbon chain nylon by polycondensation. Background technique

[0002] There are many types of short carbon chain nylon and its copolymers prepared by polycondensation. Aliphatic short carbon chain nylon includes PA46, PA410, PA412, PA56, PA510, PA512, PA66, PA610, PA612, semi-aromatic short carbon chain Nylon copolymers include PA4T / 46, PA5T / 56, PA6T / 66, PA6T / 6I, PA6T / 6I / 66, etc. This kind of nylon not only has good heat resistance, mechanical properties, solvent resistance and chemical resistance, good insulation and low moisture absorption rate, but also has good toughness and low melting point, so it has good processing performance and high cost performance. The comprehensive performance is excellent, which makes it widely used in the automotive and electrical and electronic industries. The market demand continues to increase, and the ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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