Semi-aromatic polyamide and preparation method thereof

A semi-aromatic and aromatic technology, applied in the field of preparation of semi-aromatic polyamides, to achieve the effect of increasing the melting point and avoiding loss

Inactive Publication Date: 2010-06-30
KINGFA SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In the prior art, there is no report on the preparation of semi-aromatic polyamides

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0041] Example 1

[0042] Add 6040g (5mol) tetraethylene pentamine terephthalate, 18.32g (0.15mol) benzoic acid, 6.04g into a 20L autoclave equipped with magnetic coupling stirring, condenser, gas phase port, feed port, and pressure explosion-proof port. (0.1wt% based on the total weight of the raw materials) Sodium hypophosphite, 2.2L deionized water, and the temperature is raised after purging with nitrogen. The temperature was raised to 220°C within 2 hours under stirring, the reaction mixture was stirred at 220°C for 1 hour, and then the temperature of the reactant was raised to 230°C under stirring. The reaction was continued for 2 hours at a constant temperature of 230°C and a constant pressure of 2MPa. The pressure was kept constant by removing the formed water. After the reaction was completed, the material was discharged to obtain a prepolymer with an intrinsic viscosity [η] of 0.163dl / g Things. The prepolymer was vacuum dried at 80°C for 24 hours, and then solid-phase...

Example Embodiment

[0043] Example 2

[0044] Repeat Example 1, except that the method of thickening was changed to melt thickening, the thickening temperature was 330°C, and the thickening time was 5 minutes. The results are shown in Table 1.

Example Embodiment

[0045] Example 3

[0046] Example 1 was repeated, except that the raw materials were changed to 5134g (4.25mol) of tetraethylenepentamine terephthalate and 906g (0.75mol) of tetraethylenepentamine isophthalate. The results are shown in Table 1.

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PUM

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Abstract

The invention discloses a semi-aromatic polyamide and a preparation method thereof. The method of the invention uses the aromatic dicarboxylic acid and aliphatic diamine containing 4 to 14 carbon atoms as the raw materials in order to prepare the semi-aromatic polyamide and acquire a new structure of the semi-aromatic polyamide. The semi-aromatic polyamide is prepared by combining high purity semi-aromatic polyamide salt so the polyamine loss is avoided and the mole ratio of the dicarboxylic acid and the diamine can be accurately controlled so as to acquire the high viscosity semi-aromatic polyamide. The monomer is purified in the salifying process, so the melting point, the crystallinity and the mechanical property of the semi-aromatic polyamide are promoted. The pre-polymerized material which has a viscosity eta ranged from 0.06 to 0.3 dl/g tested in 96% sulfuric acid at 25 DEG C by performing the pre-polymerization reaction is acquired. After the tackifying reaction is performed, the viscosity eta of the semi-aromatic aromatic polyamide is ranged from 0.8 to 2.5 dl/g, the melting point of the semi-aromatic aromatic polyamide is ranged from 270 to 330 DEG C, the content of the end carboxyl is ranged from 15 to 80 mol/t and the content of the end amino is ranged from 15 to 80 mol/t.

Description

technical field [0001] The invention relates to the preparation technology of semi-aromatic polyamide. Background technique [0002] Aliphatic polyamides, such as PA6 and PA66, have excellent mechanical strength, heat resistance, chemical resistance, wear resistance and self-lubricating properties, and low coefficient of friction. Their applications include electronic appliances, automotive parts, furniture , building materials and fibers, has become one of the most important engineering plastics. [0003] Semi-aromatic polyamide is a polyamide resin prepared by polycondensation of diamines or dicarboxylic acids with aromatic rings and aliphatic dicarboxylic acids or diamines, and is one of the aromatic polyamides. Due to the introduction of aromatic rings into the main chain of polyamide molecules, the heat resistance and mechanical properties are improved, the water absorption rate is reduced, and it has a more suitable performance / price ratio. It is between general engin...

Claims

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Application Information

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IPC IPC(8): C08G69/28
Inventor 罗湘安夏世勇蔡彤旻曾祥斌曹民
Owner KINGFA SCI & TECH CO LTD
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