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Preparation method of long-carbon-chain polyamide based on pentanediamine

A technology of carbon chain polyamide and pentamethylenediamine, which is applied in the field of preparation of long carbon chain polyamide, and can solve the problems of strength, barrier property, and insulation performance reduction, etc.

Pending Publication Date: 2022-07-29
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional polyamide products have been criticized for water absorption, such as PA6 and PA66, because of the strong polarity of the amide group in the molecular structure, which can combine with water molecules to form hydrogen bonds, resulting in generally high water absorption of polyamide materials , in a humid environment, the strength, barrier properties, and insulation properties of polyamide materials will all decrease

Method used

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  • Preparation method of long-carbon-chain polyamide based on pentanediamine

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] (1) take by weighing 104 parts of pentamethylenediamine, 202 parts of sebacic acid and 150 parts of deionized water, join in the salt-forming kettle, open stirring, set rotating speed to be 80rpm, set temperature to be 60 ℃, constant temperature reaction 40min, then adjust The pH value of the solution is 7.5, and a clear and transparent polyamide salt solution with a solution concentration of 50wt% is obtained;

[0057] (2) adding above-mentioned polyamide salt solution into the reactor, then adding 0.6 part of sodium hypophosphite, 0.6 part of antioxidant B215 and 4 parts of sebacic acid; replace the air in the kettle three times with nitrogen, then fill with nitrogen Make the pressure in the kettle 0.1MPa, turn on stirring, and set the stirring speed to 150rpm; finally, program the temperature rise, as follows:

[0058] 1) be warming up to 180 ℃, constant temperature reaction 60min, make polyamide salt fully prepolymerize;

[0059] 2) The temperature is raised to 210...

Embodiment 2

[0065] (1) take by weighing 104 parts of pentamethylene diamine, 216 parts of undecanedioic acid and 160 parts of deionized water, join in the salt-forming kettle, open stirring, set rotating speed to be 80rpm, set temperature to be 65 ℃, constant temperature reaction 60min, Then adjust the pH value of the solution to 7.6 to obtain a clear and transparent polyamide salt solution with a solution concentration of 50wt%;

[0066] (2) adding above-mentioned polyamide salt solution into the reactor, then adding 0.6 part of sodium hypophosphite, 0.6 part of antioxidant B215 and 4 parts of undecanedioic acid; replace the air in the kettle three times with nitrogen, then fill with Introduce nitrogen to make the pressure in the kettle be 0.1MPa, turn on stirring, and set the stirring speed to 150rpm; finally, program the temperature rise, as follows:

[0067] 1) be warming up to 185 ℃, constant temperature reaction 60min, make polyamide salt fully prepolymerize;

[0068] 2) The temper...

Embodiment 3

[0074] (1) take by weighing 104 parts of pentamethylene diamine, 230 parts of dodecanedioic acid and 170 parts of deionized water, join in the salt-forming kettle, open stirring, set rotating speed to be 80rpm, set temperature to be 70 ℃, constant temperature reaction 60min, Then adjust the pH value of the solution to 7.7 to obtain a clear and transparent polyamide salt solution with a solution concentration of 50wt%;

[0075] (2) above-mentioned polyamide salt solution is added in the reactor, then add 0.6 part of sodium hypophosphite, 0.8 part of antioxidant B215 and 3 parts of dodecanedioic acid; replace the air in the still with nitrogen three times, then fill with Introduce nitrogen to make the pressure in the kettle be 0.1MPa, turn on stirring, and set the stirring speed to 150rpm; finally, program the temperature rise, as follows:

[0076] 1) be warming up to 190 ℃, constant temperature reaction 60min, make polyamide salt fully prepolymerize;

[0077] 2) The temperatur...

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Abstract

The invention discloses a preparation method of long carbon chain polyamide based on pentamethylene diamine. Comprising the following steps: (1) reacting pentamethylene diamine, long carbon chain dibasic acid and water at 50-70 DEG C to obtain a polyamide salt solution; and (2) carrying out polymerization reaction on raw materials including the polyamide salt solution, a catalyst, an antioxidant and a molecular weight regulator under the condition of temperature programming to obtain the pentanediamine-based long-carbon-chain polyamide. The pentamethylene diamine-based long carbon chain polyamide which is good in mechanical property, high in transparency and easy to process can be obtained.

Description

technical field [0001] The present invention relates to a preparation method of pentamethylenediamine-based long carbon chain polyamide. Background technique [0002] Polyamide is commonly known as nylon. Because of its excellent mechanical strength, toughness, corrosion resistance, wear resistance and light weight, it is widely used in clothing and textiles, electronic appliances, automobiles, machinery, aerospace and other fields, ranking among the five major projects. The first of plastics. Traditional polyamide products have been criticized for water absorption, such as PA6 and PA66, because the amide group in the molecular structure has strong polarity and can combine with water molecules to form hydrogen bonds, resulting in generally high water absorption of polyamide materials. , In a humid environment, the strength, barrier properties and insulating properties of polyamide materials will be reduced. [0003] Long carbon chain polyamide (the polymerized monomer diac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/26C08G69/28
CPCC08G69/26C08G69/28
Inventor 潘凯周阳邓建平赵彪
Owner BEIJING UNIV OF CHEM TECH
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