High-color-fastness low-melting-point polyamide masterbatch preparation method

Abstract

The invention discloses a high-color-fastness low-melting-point polyamide masterbatch preparation method. The method includes: well mixing, by weight, 60-95 parts of a carrier, 4-40 parts of a coloring agent and 0.1-7 parts of a dispersing agent in a mixer, adopting a double-screw extruder for melt blending at 200-230 DEG C, and granulating to obtain high-color-fastness low-melting-point polyamidemasterbatch, wherein the carrier is prepared from low-melting-point copolyamide and ethylene-vinyl acetate copolymer; the low-melting-point copolyamide is prepared from 30-40 parts of caprolactam, 10-20 parts of nylon 66 salt and 50-60 parts of diacid and diamine, and a mole ratio of diacid to diamine is 1:(0.9-1.1). The masterbatch prepared according to the method is high in dispersity, colorability and color fastness.

Description

technical field [0001] The invention belongs to the technical field of color masterbatches, in particular to a method for preparing color masterbatches for polyamide with high color fastness and low melting point. Background technique [0002] Generally speaking, polyamide is a polymer with a relatively high melting point, and the melting points of the most commonly used polyamide 6 and polyamide 66 are 220°C and 260°C, respectively. This is because the amide groups in the polyamide molecular chain can form hydrogen bonds, thereby increasing the force between the molecular chains. Polyamide has good molding processing performance and excellent comprehensive performance. It can be spun, processed into film materials, and can also be used as engineering plastics. By introducing some copolymerization units with irregular molecular structures or long carbon chains, it can affect the formation of hydrogen bonds in the molecular chains and expand its application fields. Low-melt...

AI Technical Summary

Problems solved by technology

If the low-melting point copolyamide is colored with polyamide 6 color masterbatch as the carrier, although the compatibility is excellent, the melting point of the obtained product will increase, which will affect the hot-melt performance of the fiber

However, if the low-melting point copolyamide is used alone as the carrier, although the melting point of the final product is less affected, the resulting product has poor color fastness to perspiration and does not meet the standards for clothing items.

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