Alcoholysis-resistant polyamide resin as well as preparation method and application thereof

Abstract

The invention provides alcoholysis-resistant polyamide resin as well as a preparation method and application thereof. The polyamide resin is prepared from the following raw material components in percentage by mass: 97.8 to 99.98 percent of a comonomer and 0.0043 to 0.011 percent of an end-capping reagent, the comonomer is prepared from the following components in percentage by mass: 80 to 92 percent of nylon 66 salt and 5 to 15 percent of aliphatic amide monomer; the molar concentration of terminal carboxyl groups in the polyamide resin is 10 to 25 mmol / kg; the molar ratio of amino-terminated groups to carboxyl-terminated groups in the polyamide resin is greater than or equal to 4: 1. The alcoholysis-resistant polyamide resin is prepared by the following steps: reacting a comonomer with an end-capping reagent to obtain a polyamide polymer, mixing the polyamide polymer with an optional alcoholysis-resistant agent, and slicing and granulating. The alcoholysis-resistant polyamide resin provided by the invention has better alcoholysis resistance and better mechanical properties, and is suitable for being used as a vehicle material.

Description

technical field [0001] The invention belongs to the field of polyamide resins, in particular to an alcoholysis-resistant polyamide resin and its preparation method and application. Background technique [0002] Polyamide is the general term for thermoplastic resins containing repeated amide groups on the main chain of the molecule. properties, wear resistance, chemical resistance and self-lubricating properties, low friction coefficient, certain flame retardancy, and easy processing, so its products are widely used, covering almost every field, and are among the top five engineering plastics. The widest variety. However, due to the presence of amide groups, polyamide is prone to hydrolysis reaction in an environment with high temperature and high humidity. Once the hydrolysis reaction occurs, the polyamide product will degrade rapidly, resulting in a significant decline in product performance and service life. , Lose the application value, so how to prepare a polyamide res...

AI Technical Summary

Problems solved by technology

This technical scheme reduces the overall polarity of the material and reduces the water absorption of the material by adding high molecular weight maleic anhydride grafted polyethylene wax, thereby improving the hydrolysis resistance of short glass fiber reinforced nylon 66, but it does not affect nylon 66 Resin properties are improved

[0006] It can be seen that the method for improving the alcoholysis resistance of nylon composite materials in the prior art is usually to add alcoholysis-resistant additives or fillers to nylon materials, such as adding glass fibers; the introduction of alcoholysis-resistant additives or fillers will not only Affect the microscopic continuity of nylon materials, resulting in changes in mechanical properties, and will increase the difficulty of polymer processing and increase the cost of preparation

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