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Formula and preparation method for producing low melting point and high decomposition temperature ternary copolyamide without ring-opening agent

A ternary copolyamide and decomposition temperature technology, which is applied in the formulation and preparation of high decomposition temperature ternary copolyamide materials, to achieve the effects of saving production costs, simplifying the production process, and simple process

Active Publication Date: 2015-09-16
HUNAN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, this method requires precise control of the feed ratio of organic montmorillonite, anhydrous calcium chloride, extrusion temperature, and strict drying of the raw materials.

Method used

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  • Formula and preparation method for producing low melting point and high decomposition temperature ternary copolyamide without ring-opening agent
  • Formula and preparation method for producing low melting point and high decomposition temperature ternary copolyamide without ring-opening agent
  • Formula and preparation method for producing low melting point and high decomposition temperature ternary copolyamide without ring-opening agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add 3000 parts of caprolactam, 60 parts of sebacic acid, 34 parts of hexamethylenediamine into a 10L polymerization kettle, one part has a mass of 1 g, feed nitrogen for 0.5 hours, and then under 2 bar (g) pressure, 230 ° C, nitrogen protection React with a stirring speed of 500 r / min for 8 hours, the conversion rate of caprolactam can reach 96%, the number average molecular weight after drying is about 16000, the melting range is 168 ℃ ~ 202 ℃, the thermal decomposition temperature is 450 ℃, and the tensile strength is 46.7 MPa , Elongation at break 28.3%.

Embodiment 2

[0033] Add 3000 parts of caprolactam, 300 parts of malonic acid, 173 parts of ethylenediamine in a 10L polymerization kettle, one part has a mass of 1 g, and feed nitrogen for 0.5 hour, then at 5 bar (g) pressure, 230 ° C, nitrogen protection and React at a stirring speed of 150 r / min for 8 hours, and the conversion rate of caprolactam can reach 95%. After drying, a terpolymer with a number average molecular weight of about 17,000 and a polyamide segment content of 86.4% is obtained. The melting range is 190 ℃ ~ 215 ℃ , thermal decomposition temperature 445 ℃, tensile strength 46.3 MPa, elongation at break 29.8%.

Embodiment 3

[0035] Add 2000 parts of caprolactam, 20 parts of terephthalic acid and 14 parts of hexamethylenediamine in the polymerization kettle, one part has a mass of 1 g, and feed nitrogen for 0.5 hours, then under 8 bar (g) pressure, 230 ° C, nitrogen protection and After reacting at a stirring speed of 300 r / min for 8 hours, the conversion rate of caprolactam can reach 97%. After drying, a terpolymer with a number average molecular weight of about 28,000 and a polyamide segment content of 98.3% is obtained. The melting range is 195 ℃ ~ 212 ℃ , thermal decomposition temperature 453 ℃, tensile strength 50.1 MPa, elongation at break 26.8%.

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Abstract

The present invention relates to a polymer material, more particularly to a low melting point and high decomposition temperature ternary copolyamide produced without a ring-opening agent. According to the present invention, the problem that the caprolactam polymerization process is limited by the ring-opening agent (the conventional polymerization reaction usually adopts water and aminocaproic acid as ring-opening agents) is solved, wherein in order to ensure the ring-opening reaction rate, a lot of water is required to be added at the reaction early stage so as to cause problems such as water removing difficulty at the reaction later stage, high energy consumption, and influence of not complete water removing on the product quality; the low molecular weight extractable product content of the polyamide 6 prepared through the conventional polymerization is more than 9%, the extraction and re-drying process is required before the processing so as to provide the long process and increase the product cost, the low molecular weight extractable product content of the product of the present invention is only 1-5% so as to eliminate the extraction re-drying and monomer recovery process, and the caprolactam conversion rate is substantially improved so as to save the cost; and the problems of high melting point and difficult processing of polyamide are solved, and the shortcomings of the prior art are overcome.

Description

[0001] technical field [0002] The invention relates to a formula and preparation method of a polymer material, specifically a kind of polymer material with a low melting point and a high decomposition temperature prepared by copolymerization of caprolactam, a dibasic acid and a dibasic amine without adding a ring-opening agent. Formula and preparation method of meta-copolyamide material. Background technique [0003] Polyamide, commonly known as nylon, has good wear resistance, self-lubrication, solvent resistance and good processability. It is a polymer material with excellent performance and a wide range of uses. In industrial production, it is widely used in clothing, bearings, gears, cams, pump impellers, worm gears, various rollers, fan blades, propellers, nuts, screws, gaskets, high-pressure sealing rings, oil-resistant sealing gaskets, gaskets, and shells , shearing machine, electromagnetic distribution valve seat, various oil pipelines on automobiles and tractors,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/36C08G69/40
Inventor 易春旺彭舒敏李杰黄映珊苏胜培王曦
Owner HUNAN NORMAL UNIVERSITY
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