Polyamide, synthesis method and application thereof, and polyamide product

A synthesis method and polyamide technology are applied in the field of polyamide, polyamide products, and their synthesis, which can solve the problems of easy degradation and damage to mechanical properties, and achieve the effects of increasing viscosity and inhibiting loss.

Active Publication Date: 2014-01-29
KINGFA SCI & TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When polyamide contains a high content of carboxyl groups, the product is easily degraded when it is melted or modified, which impairs its mechanical properties and ultimately affects its use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0035] The invention discloses a synthesis method of polyamide, which is characterized in that it comprises the following steps:

[0036] Adding: adding the raw materials into the reaction kettle and mixing thoroughly to obtain a mixture, the raw materials include (a) dibasic acid, (b) diamine, and optionally (c) other components;

[0037] Inflating: Fill the reactor with protective gas, wherein the protective gas contains CO 2 , CO 2 Accounting for the volume content of the protective gas is 60-66.7 or 66.7-100%;

[0038] Prepolymerization: Heating the reactor to make the mixture in the reactor undergo prepolymerization.

[0039] Wherein, after the prepolymerization reaction is completed and the material is discharged, the prepolymerization product is dried and then solid-phase thickened to obtain polyamide.

[0040] Wherein, in the inflation step, the pressure in the reactor is increased to 0.1-0.3MPa, 0.3-0.5MPa or 0.5-1.0MPa.

[0041] Wherein, the protective gas furthe...

Embodiment 1

[0066] Add 20mol of terephthalic acid, 20.2mol of 1,10-decanediamine, 74.8g of benzoic acid, and 6.98g of hypophosphorous acid into a pressure vessel equipped with magnetic coupling stirring, condenser, gas phase port, feeding port, and pressure explosion-proof port Sodium, filled with CO after evacuation 2 to atmospheric pressure, and then filled with CO after repeated vacuuming 2 process three times, and finally the CO 2 The pressure rises to 0.1MPa. The temperature was raised to 220°C with stirring over 2 hours, the reaction mixture was stirred at 220°C for 1 hour, then the temperature of the reactants was raised to 230°C with stirring. The reaction was continued for 2 hours at a constant temperature of 230°C and a constant pressure of 2.2MPa, and the pressure was kept constant by removing the formed water. After the reaction was completed, the material was discharged, and the prepolymer was vacuum-dried at 80°C for 24 hours to obtain the prepolymer. Polymerized product,...

Embodiment 2

[0069] Add 20mol of terephthalic acid, 20.2mol of 1,10-decanediamine, 74.8g of benzoic acid, and 6.98g of hypophosphorous acid into a pressure vessel equipped with magnetic coupling stirring, condenser, gas phase port, feeding port, and pressure explosion-proof port Sodium, filled with CO after evacuation 2 to atmospheric pressure, and then filled with CO after repeated vacuuming 2 process three times, and finally the CO 2 The pressure rose to 0.3MPa. The temperature was raised to 220°C with stirring over 2 hours, the reaction mixture was stirred at 220°C for 1 hour, then the temperature of the reactants was raised to 230°C with stirring. The reaction was continued at a constant temperature of 230°C and a constant pressure of 2.2MPa for 2 hours, and the pressure was kept constant by removing the formed water. After the reaction was completed, the material was discharged, and the prepolymer was vacuum-dried at 80°C for 24 hours to obtain the prepolymer. Polymerized product, ...

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PUM

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Abstract

The invention discloses a polyamide, a synthesis method and application thereof, and a polyamide product. The synthesis method comprises the following steps: feeding: proportionally adding dibasic acid monomer, diamine monomer and other reaction assistants into a reaction kettle; charging shielding gas into the reaction kettle until the pressure in the reaction kettle is 0.2-1.0 MPa, wherein the shielding gas contains 60-100 vol% of CO2; heating the reaction kettle to perform prepolymerization reaction on the mixture in the reaction kettle, discharging after the prepolymerization reaction is finished, drying the prepolymerization product, and carrying out solid-phase tackification to obtain the polyamide. The terminal amino content and terminal carboxyl content in the polyamide prepared by the synthesis method are low. The polyamide disclosed by the invention is applicable to a manufacturing material of electric and electronic equipment, automobile part, office supply or home supply. The invention also discloses a manufacturing material of electric and electronic equipment, automobile part, office supply or home supply.

Description

[0001] technical field [0002] The invention relates to the field of polyamide synthesis, in particular to a polyamide, its synthesis method and application, and polyamide products. [0003] Background technique [0004] Polyamide is widely used because of its good comprehensive properties, including mechanical properties, heat resistance, wear resistance, chemical resistance and self-lubrication, low coefficient of friction, certain flame retardancy, and easy processing. It is suitable for filling and modifying with glass fiber and other fillers to improve performance and expand application range. In recent years, semi-aromatic polyamides have been focused on development due to their better heat resistance and mechanical properties. [0005] When the polyamide contains a high content of carboxyl groups, the product is easily degraded when it is melted or modified, thereby impairing its mechanical properties and ultimately affecting its use. When the polyamide contains a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/28C08G69/26C08L77/06
Inventor 张传辉蔡彤旻曾祥斌曹民夏世勇叶南飚陈大华
Owner KINGFA SCI & TECH CO LTD
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