Semi-aromatic transparent polyamide and its synthesis method

A semi-aromatic, synthetic method technology, applied in the field of materials, can solve the problems of restricting the large-scale promotion of solid-phase polymerization, accelerating the discharge of small molecules of by-products, and many production processes of solid-phase polymerization, and improving the notched impact strength and antistatic properties. Excellent ability and processability, and the effect of reducing the process

Active Publication Date: 2017-09-19
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since solid-phase polymerization is generally carried out at 15-30°C below the melting point of the prepolymer, the reaction rate is slow and the reaction time is long, and the production process of solid-phase polymerization is complicated and the process is complicated. The requirements for equipment parameters are high, and the reaction is slow. It is necessary to ensure that the ratio of functional groups is close to 1:1, and the viscosity-increasing stage requires vacuum or air flow to accelerate the discharge of small molecules of by-products, thereby increasing the molecular weight of polycondensation products. Therefore, the above conditions limit the large-scale promotion of solid-phase polymerization

Method used

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  • Semi-aromatic transparent polyamide and its synthesis method
  • Semi-aromatic transparent polyamide and its synthesis method
  • Semi-aromatic transparent polyamide and its synthesis method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] The raw material composition and synthetic steps of the polyester amide used in the present embodiment are as follows:

[0080](1) Vacuum-dried monomer 2: 1006.6g (5mol) 11-aminoundecanoic acid, 456.6g (4mol) 6-caprolactone, 270.3g (1.25mol) 2,2'-(1,3 -Phenylene)-bisoxazoline was added to the stirred polymerization reactor, and tetrabutyl titanate (17.3 g) of 1% of the total weight of monomer 2 was added as a catalyst, and 500 mL of water was added as a mass transfer and heat transfer Then vacuumize for 5 minutes, pass nitrogen for 5 minutes, and circulate like this for 6 times, so that the reactant exists in the environment under nitrogen protection, and the system pressure in the stirred polymerization reactor is controlled to be 0.2MPa;

[0081] (2) within 2.5 hours, heat the stirred polymerization reactor to 250°C at a uniform speed, and adjust the stirring speed of the stirred polymerization reactor to 40r / min, wherein, when the temperature of the stirred polymeriz...

Embodiment 2

[0086] The raw material composition and synthesis steps of the polyester amide used in this example are the same as those in Example 1.

[0087] The synthetic method of a kind of semi-aromatic transparent polyamide of the present embodiment comprises the following steps:

[0088] (1) Add monomer 1 after vacuum drying: 116.2g (1mol) hexamethylenediamine, 99.7g (0.6mol) isophthalic acid, 66.5g (0.4mol) terephthalic acid into the stirred polymerization reactor , add the polyester amide of 8% (22.6g) of monomer 1 total weight simultaneously, the long carbon chain carboxylic acid calcium salt of 0.3% (0.8g), the benzoic acid of 2% (5.6g), 0.3% (0.8g) ) of N,N`-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,3-phthalamide, add 100mL water as the medium of mass transfer and heat transfer; then vacuumize 5min, nitrogen 5min, so cycle 6 times, so that the reactant exists in the environment under the protection of nitrogen, control the system pressure in the stirred polymerization reactor to ...

Embodiment 3

[0091] The raw material composition and synthesis steps of the polyester amide used in this example are the same as those in Example 1.

[0092] The synthetic method of a kind of semi-aromatic transparent polyamide of the present embodiment comprises the following steps:

[0093] (1) Add monomer 1 after vacuum drying: 116.2g (1mol) hexamethylenediamine, 149.5g (0.9mol) isophthalic acid, 16.6g (0.1mol) terephthalic acid into the stirred polymerization reactor , add simultaneously the polyester amide of 2% (5.6g) of monomer 1 gross weight, the long carbon chain carboxylate calcium salt of 0.2% (0.6g), the benzoic acid of 0.5% (1.4g), 0.2% (0.6g) ) of N,N`-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,3-phthalamide, add 100mL water as the medium of mass transfer and heat transfer; then vacuumize 5min, nitrogen 5min, so cycle 6 times, so that the reactants exist in the environment under the protection of nitrogen, control the system pressure in the stirred polymerization reactor to 0....

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Abstract

The invention discloses a semi-aromatic transparent polyamide and a synthesis method thereof. The semi-aromatic transparent polyamide has a structure shown in a formula I, wherein a equals to 10-100, b equals to 10-200, c equals to 10-100, d equals to 10-100, and R is a polyester amide. The semi-aromatic transparent polyamide has high mechanical properties and transmittance, low water absorption and excellent processing performance, can be applied in the mechanical parts around the fuel oil, electrical and mechanical components, precision optical instruments, pressure-resistant windows, viewers, special light fixture housing, food packaging films, and high-end sports equipment.

Description

technical field [0001] The invention relates to the field of materials, in particular to a semi-aromatic transparent polyamide and a synthesis method thereof. Background technique [0002] Transparent polyamide is a polymer material with excellent comprehensive properties. It not only has the advantages of high mechanical strength, good thermal stability, and excellent corrosion resistance, but also has the advantages of easy molding and processing, dimensional stability, small linear expansion coefficient, high cost performance, excellent electrical insulation and aging resistance, non-toxic, Odorless, easy to form alloys with other amorphous or semi-crystalline polyamides, etc.; not only excellent transparency (transparency even exceeds PC, close to PMMA), but also resistance to environmental stress cracking, oily solvents, scratch resistance, wear resistance It is superior to general transparent polymer materials (such as PS, PC, PMMA, etc.) in terms of damage and so on....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/44
CPCC08G69/44
Inventor 胡国胜张静婷王忠强石哲平师文博方春晖刘冰肖许和伟
Owner ZHONGBEI UNIV
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