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Method for preparing polyamide by using molecular weight control agent having double active group, and polyamide prepared thereby

A technology of molecular weight regulator and dual active groups, applied in the field of polyamide, can solve problems such as low efficiency and uneven reaction

Active Publication Date: 2020-08-14
HANWHA SOLUTIONS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is inefficient when applied to the reactive extrusion method due to solvent removal issues etc.
[0012] In particular, existing methods rely on the method of inducing high molecular weight through additional side reactions, etc., such as polyamide 12 or polyamide 612 polymerized at high temperature. Inhomogeneous reaction occurs before reacting to form polymer chains

Method used

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  • Method for preparing polyamide by using molecular weight control agent having double active group, and polyamide prepared thereby
  • Method for preparing polyamide by using molecular weight control agent having double active group, and polyamide prepared thereby
  • Method for preparing polyamide by using molecular weight control agent having double active group, and polyamide prepared thereby

Examples

Experimental program
Comparison scheme
Effect test

preparation example

[0076] IBL (isophthaloyl-bis-laurolactam, isophthaloyl dilaurolactam) molecular weight regulator preparation of

[0077] Set the stirrer, reflux condenser tube and dropping funnel in the three-necked flask. At this point, all glasses were pre-dried under a nitrogen atmosphere in consideration of moisture-sensitive reactants. 1 mol equivalent of laurolactam (197.32 g) as a monomer, 1 mol of triethylamine, and 500 mL of THF were added to the flask and stirred. Among them, triethylamine (triethylamine) acts as a trapping agent for trapping hydrochloric acid generated by the reaction of laurolactam and isophthaloyl chloride. The prepared mixture was stirred and cooled on ice, and a solution obtained by dissolving 0.5 mol equivalent of isophthaloyl chloride in 150 mL of THF was slowly added dropwise for 40 minutes. After the addition was complete, the reaction mixture was stirred at room temperature for 30 minutes and then filtered. After drying the white solid under air, in...

Embodiment 1

[0080] Preparation of Polyamides Using Molecular Weight Regulators (IBL) with Bi-Reactive Groups

[0081] Caprolactam and laurolactam as a monomer and NaH as an initiator were weighed at a molar ratio of 50:50:1, respectively, and then put into a three-necked flask, and the temperature of the oil bath was adjusted to 160°C. After dissolving the monomer and the initiator once under a nitrogen atmosphere, and after confirming that the reactants are all dissolved, a vacuum is applied and hydrogen gas generated in the reactants is removed. After adjusting to a temperature of 230° C. at which the polymerization reaction actually occurs, 0.05 mol of a molecular weight modifier and 0.15 mol of an activator TDI were added to 100 parts by weight of lactam in total. When the polymerization was completed, after the reaction was terminated by adding a mixed solution of 1:1 formic acid and water, after washing with water and alcohol several times, and finally drying in a vacuum oven, the...

Embodiment 2

[0085] As shown in Table 1 above, a polyamide was prepared in the same manner as in Example 1 except that an end-capping agent was added in a molar ratio of 0.2.

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Abstract

The present invention provides: a method for preparing a polyamide by using a molecular weight control agent having a double active group, the method using a molecular weight control agent containinga double active group in the anionic ring-opening copolymerization of a polyamide, thereby enabling molecular weight to be controlled through the addition reaction of the molecular weight control agent; and a polyamide prepared thereby.

Description

technical field [0001] The present invention relates to a method for the preparation of polyamides using a molecular weight regulator with dual reactive groups and the polyamides prepared therefrom. In more detail, in the anionic ring-opening copolymerization of polyamide, the use of a molecular weight regulator containing dual active groups, so that the molecular weight can be controlled by the addition reaction of the molecular weight regulator using the molecular weight regulator with dual active groups Process for the preparation of polyamides and polyamides prepared therefrom. Background technique [0002] Polyamide resin is a straight-chain polymer bonded by amide (-NHCO-) ​​bonds. Due to its strong toughness, excellent physical properties such as abrasion resistance, abrasion resistance, oil resistance, and solvent resistance, it is easy to be melt-molded, so Widely used as clothing materials, fibers for industrial materials, engineering plastics, etc. Polyamides ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/18C08K5/3412C08K3/12C08K3/22C08K5/057C08L77/02C08J5/00
CPCC08G69/18C08L77/02C08K5/3412C08K3/12C08K3/22C08K5/057C08J5/00C08G69/20C08G83/003C08G83/005
Inventor 金杜耿李镇瑞权庆浩都会李惠连林京元金大鹤
Owner HANWHA SOLUTIONS CORP
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