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Chain extender for polyamide preparation through chain extending

A technology of chain extender and polyamide, applied in the field of chain extender, can solve the problems affecting the spinnability of slices, material gel, etc., and achieve the effect of good spinnability, stable amino content and high dyeing uniformity

Inactive Publication Date: 2012-02-08
ZHANGJIAGANG CHAINENG BIOLOGICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, the chain extenders that have appeared are all aimed at further increasing the viscosity of PA products, and the use of industrial reports is limited to the preparation of polyamide engineering plastics by twin-screw extruders. These chain extenders cannot be used for direct polymerization of polyamides. In the process, because industrial fibers are mainly extruded by a single screw, after adding these chemical chain extenders, the reaction is uneven and the material gels, resulting in a large number of floating yarns and broken ends during spinning, which affects the spinnability of slices

Method used

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  • Chain extender for polyamide preparation through chain extending
  • Chain extender for polyamide preparation through chain extending
  • Chain extender for polyamide preparation through chain extending

Examples

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Embodiment 1

[0023] According to the chain extender of this embodiment, it is prepared by the following steps: 10kg polymethyl methacrylate (density is 1.19kg / dm 3 , light transmittance 99%, impact strength ≥ 16kg / cm 3 , tensile strength ≥ 61kg / m 3 , heat modification temperature ≥ 78°C, heat softening temperature ≥ 105°C) and 0.1kg of styrene in a stainless steel reactor equipped with a stirrer, condenser and temperature control device and protected by nitrogen, react at a temperature of 110°C for 3 hours The resulting copolymer is the chain extender.

[0024] The physical properties of the chain extender are as follows: the appearance is a transparent block; the number average molecular weight is 6200; the glass transition temperature is 54°C; and the weight percentage of styrene is 0.7%.

Embodiment 2

[0026] According to the chain extender of this embodiment, it is prepared by the following steps: 9kg polymethyl methacrylate (density is 1.19kg / dm 3 , light transmittance 99%, impact strength ≥ 16kg / cm 3 , tensile strength ≥ 61kg / m 3 , heat modification temperature ≥ 78°C, heat softening temperature ≥ 105°C) and 0.2kg styrene in a stainless steel reactor equipped with a stirrer, condenser and temperature control device and protected by nitrogen, react at a temperature of 110°C for 2 hours The resulting copolymer is the chain extender.

[0027] The physical properties of the chain extender are as follows: the appearance is a transparent block; the number average molecular weight is 6300; the glass transition temperature is 54°C; and the weight percentage of styrene is 1.1%.

Embodiment 3

[0029] According to the chain extender of this embodiment, it is prepared by the following steps: 8kg polymethyl methacrylate, 0.5kg styrene and 0.2kg maleic anhydride are equipped with agitator, condenser and temperature control device and have nitrogen protection In a stainless steel reactor, react at a temperature of 110°C for 3 hours to obtain a copolymer, which is a chain extender.

[0030] The physical characteristics of the chain extender are as follows: the appearance is a transparent block; the number average molecular weight is 6700, and the glass transition temperature is 52 ° C, wherein the weight percentage of styrene is 0.9%, the weight percentage of maleic anhydride 3%.

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Abstract

The invention relates to a chain extender for polyamide preparation through chain extending. The chain extender is prepared by the step of: reacting polymethyl methacrylate with styrene in a stainless steel reaction vessel equipped with a mixer, a condenser and a temperature control device as well as nitrogen atmosphere for 2-3h at a temperature of 108DEG C-112DEG C, thus obtaining a copolymer with a number-average molecular weight of 6000-7500 and a glass transition temperature of 50DEG C-60DEG C, with the styrene of 0.05 wt%-2 wt% in content. The invention also relates to application of the chain extender in a direct polymerization technology of polycaprolactam. Polycaprolactam slices obtained by a direct polymerization technology employing the chain extender have stable amino end group content, and high dyeing uniformity in a post processing process as well as good spinnability, thus being suitable for polyamide high-speed spinning and fine denier yarn production.

Description

technical field [0001] The invention relates to a chain extender, in particular to a chain extender prepared by a chemical chain extension method for polyamide. Background technique [0002] Nylon (PA) not only has excellent mechanical properties and good electrical properties, but also has wear resistance, oil resistance, solvent resistance, self-lubrication, self-extinguishing, corrosion resistance and good processability. [0003] High-viscosity nylon materials, due to their excellent mechanical properties, have received increasing attention in industrial applications. In order to prepare high-viscosity PA, it can be obtained by prolonging the polymerization time, improving vacuum capacity, solid-state polymerization and chemical chain extension, but there are certain difficulties, such as increasing energy consumption and decreasing production efficiency when prolonging the polycondensation reaction time, and It is also easy to cause side reactions such as product decom...

Claims

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Application Information

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IPC IPC(8): C08G69/16C08G69/40C08F265/04C08F212/08C08F222/08C08G81/02
Inventor 卞忠华
Owner ZHANGJIAGANG CHAINENG BIOLOGICAL TECH
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