Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of formula and preparation method of producing ternary copolyamide with low melting point and high decomposition temperature without using ring-opening agent

A technology of ternary copolyamide and decomposition temperature, which is applied in the field of formulation and preparation of ternary copolyamide materials with high decomposition temperature, and achieves the effects of high molecular weight, high reaction conversion rate and production cost saving.

Active Publication Date: 2017-09-12
HUNAN NORMAL UNIVERSITY
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of formula and preparation method of producing ternary copolyamide with low melting point and high decomposition temperature without using ring-opening agent
  • A kind of formula and preparation method of producing ternary copolyamide with low melting point and high decomposition temperature without using ring-opening agent
  • A kind of formula and preparation method of producing ternary copolyamide with low melting point and high decomposition temperature without using ring-opening agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add 3000 parts of caprolactam, 60 parts of sebacic acid, 34 parts of hexamethylenediamine in a 10L polymerization kettle, one part has a mass of 1g, and feed nitrogen for 0.5 hour, then under 2 bar (g) pressure, 230 ° C, nitrogen protection and After reacting at a stirring speed of 500 r / min for 8 hours, the conversion rate of caprolactam can reach 96%. After drying, the number average molecular weight is about 16000, the melting range is 168 ℃ ~ 202 ℃, the thermal decomposition temperature is 450 ℃, and the tensile strength is 46.7 MPa. The elongation at break is 28.3%.

Embodiment 2

[0032] 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 1g, feed nitrogen for 0.5 hour, then under 5 bar (g) pressure, 230 ℃, nitrogen protection and 150 After reacting at r / min stirring speed for 8 hours, 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 ℃. The thermal decomposition temperature is 445 ℃, the tensile strength is 46.3 MPa, and the elongation at break is 29.8%.

Embodiment 3

[0034] 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 300 After reacting at r / min stirring speed for 8 hours, the conversion rate of caprolactam can reach 97%. After drying, a terpolymer with a number average molecular weight of about 28000 and a polyamide segment content of 98.3% is obtained. The melting range is 195 ℃ ~ 212 ℃. The thermal decomposition temperature is 453 ℃, the tensile strength is 50.1 MPa, and the elongation at break is 26.8%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
melting pointaaaaaaaaaa
temperatureaaaaaaaaaa
melting pointaaaaaaaaaa
Login to View More

Abstract

The present invention relates to a polymer material, in particular to a ternary copolyamide with a low melting point and a high decomposition temperature produced without using a ring-opening agent. The invention solves the restriction of the ring-opening agent in the caprolactam polymerization process (conventional polymerization reaction usually uses water and aminocaproic acid as the ring-opening agent). In order to ensure the ring-opening reaction rate, a large amount of water needs to be added in the early stage of the reaction, resulting in difficulty in removing water in the later stage of the reaction. , high energy consumption, and incomplete water removal, which affects product quality; in addition, the content of low-molecular-weight extractables of polyamide 6 prepared by conventional polymerization is >9%, and it needs to be extracted and then dried before processing. Increased costs. However, the content of low-molecular extractables in the product of the present invention is only 1% to 5%, which can save the process of extraction, re-drying and monomer recovery, and the conversion rate of caprolactam is greatly improved, which can save costs; it also solves the problem of high melting point of polyamide, The problem of difficult processing makes up for the deficiencies of the prior art.

Description

technical field [0001] 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 [0002] 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, etc. ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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