Color oil for ultra-high molecular weight polyethylene fiber and preparation method of color oil

Abstract

The invention discloses a preparation method of color oil for an ultra-high molecular weight polyethylene fiber. The method comprises the following steps that a) a dispersion agent with an anchoring structure is added to a polyethylene spinning solvent, dispersion is conducted for at least 0.1 h under the stirring state, a pigment with a modified surface is added for stirring, the mixed solution is placed for wetting, and a liquid-state color master pre-mixed solution is obtained; b) the liquid-state color master pre-mixed solution obtained in the step a) is subjected to high-speed dispersion,the temperature is controlled within 60-180 DEG C, free radical macromolecules and an initiator are added, and a modified liquid-state color master batch is obtained; c) the modified liquid-state color master batch obtained in the step b) is subjected to grinding dispersion or cutting dispersion, and the color oil for the polyethylene fiber is obtained. The fiber prepared through the color oil for the polyethylene fiber has the advantages that the fiber diameter is small, the color fastness and fastness to washing are high, and the pigment does not fall off or transfer.

Description

technical field [0001] The invention relates to a color oil for polyethylene fibers and a preparation method thereof, in particular to a color oil for ultra-high molecular weight polyethylene fibers and a preparation method thereof, belonging to the field of fine chemicals. Background technique [0002] Ultra-high molecular weight polyethylene has a viscosity-average molecular weight of 5-6 million with vinyl as a repeating unit, does not contain active groups, has strong chemical inertness, and has good acid and alkali resistance and solvent resistance. Due to its lightness and softness, high specific strength and specific modulus, UV resistance, impact resistance and corrosion resistance, UHMWPE has broad application prospects in bulletproof materials, shock-absorbing materials, and high-performance lightweight composite materials. However, due to the non-polarity and regular crystallization of ultra-high molecular weight polyethylene molecules, it is difficult to fix the ...

AI Technical Summary

Problems solved by technology

However, due to the non-polarity and regular crystallization of ultra-high molecular weight polyethylene molecules, it is difficult to fix the pigment on it, and its spinning temperature is higher than 300°C, so it is difficult to use existing polyester or polyamide carriers to make color masterbatches for addition

[0003] The Chinese patent with the application number CN200910154196.9 discloses a production method of colored fine denier fiber of ultra-high molecular weight polyethylene. The polyethylene powder and solvent are unwound and mixed in the unwrapping kettle, and then the pigment is added and mixed to obtain the The emulsion mixture of pigments; the application number is the Chinese patent of CN201010124394.3. On this basis, a peristaltic pump is added to feed the stock solution evenly into the screw extruder, which reduces the unevenness of the fibers; but due to the high pigment Structured, it is difficult to disperse highly structured pigments without adding surfactants or dispersants, and it is easy to cause large pigment particles and low tinting strength; the Chinese patent application number CN201310471883.X discloses a coloring method for stock solution , use disperse anchoring agent to disperse organic pigment in isoparaffin solvent, and then mix with polyethylene gel solution, but its pigment concentration is low (high pigment concentration is easy to cause flocculation, it is difficult to disperse), solvent is used more , leading to a sudden drop in viscosity during the spinning process, screw slippage, and breakage of the spinning screw; the US patent with the publication number US5613987 discloses a method of using dyes to color high-tenacity, ultra-high molecular weight polyethylene fibers before spinning, However, the weather resistance of dyes is far lower than that of pigments, and it is difficult to meet the applications with high weather resistance requirements; although the Chinese patent application number CN201710213693.6 has invented a dispersant with sulfonic acid groups, it cannot be used in polymers. In the liquid dispersion of ethylene, the viscosity of the system increases and the fluidity is poor

[0004] Most of the existing liquid color masterbatches achieve the dispersion of pigments through physical force or molecular electrostatic force. In addition, the molecular chain segments of the added surfactants or dispersants are relatively short, and it is difficult to disperse the ultra-high molecular weight polyethylene chain segments. Wrapping, causing the pigment in the liquid color masterbatch to fall off or migrate easily, resulting in the pollution of the spinning roller, resulting in the reduction of fiber color fastness, light fastness or washing fastness in fiber use

In addition, there are also problems such as the incompatibility of the surfactant or dispersant used in the pigment and the carrier, and the inability to withstand high temperatures, resulting in discoloration of the pigment, and the larger particles block the spinneret hole, which can only be used in films, coatings or wet In fibers with larger diameters spun by

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