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High temperature resistant polyamide and method for synthesizing the same

A synthetic method and polyamide 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 solid-phase polymerization production processes, so as to achieve excellent processing performance, increase productivity, reduce Process effect

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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  • High temperature resistant polyamide and method for synthesizing the same
  • High temperature resistant polyamide and method for synthesizing the same
  • High temperature resistant polyamide and method for synthesizing the same

Examples

Experimental program
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Effect test

Embodiment 1

[0075] The raw material composition and synthesis steps of the polyester amide used in this embodiment are as follows:

[0076] (1) The monomer after vacuum drying 2: 1006.6g (5mol) 11-aminoundecanoic acid, 456.6g (4mol) 6-caprolactone, 270.3g (1.25mol) 2,2'-(1,3 -Phenylene)-Dioxazoline was added to the stirred polymerization reactor, while adding 1% of the total weight of monomer 2 to tetrabutyl titanate (17.3g) as a catalyst, and 500mL of water as mass transfer and heat transfer The medium; then vacuum for 5min, nitrogen gas for 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 0.2MPa;

[0077] (2) In 2.5 hours, heat the agitated polymerization reactor to 250℃ in an airtight manner and adjust the stirring speed of the agitated polymerization reactor to 40r / min. When the temperature of the agitated polymerization reactor reaches 210℃, vent gas To 1.6MPa, and...

Embodiment 2

[0082] The raw material composition and synthesis steps of the polyester amide used in this example are the same as those in Example 1.

[0083] In this embodiment, a method for synthesizing high-temperature resistant polyamide includes the following steps:

[0084] (1) Add the vacuum-dried monomer 1:116.2g (1mol) hexamethylenediamine, 166.1g (1mol) terephthalic acid, 120.8g (0.6mol) 11-aminoundecanoic acid into the stirred polymerization reactor Add 8% (32.2g) of polyester amide, 8% (32.2g) of organic montmorillonite, 3% (12.1g) of benzoic acid, and 0.3% (1.2g) of the total weight of monomer 1. N,N`-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,3-phthalamide, add 100mL water as the mass and heat transfer medium; then vacuum for 5min, Blow nitrogen gas for 5 minutes and circulate 6 times so that the reactants exist in an environment protected by nitrogen, and control the system pressure in the stirred polymerization reactor to 0.2MPa;

[0085] (2) Heat the agitated polymerization reacto...

Embodiment 3

[0087] The raw material composition and synthesis steps of the polyester amide used in this example are the same as those in Example 1.

[0088] In this embodiment, a method for synthesizing high-temperature resistant polyamide includes the following steps:

[0089] (1) Add the vacuum-dried monomer 1:116.2g (1mol) hexamethylenediamine, 166.1g (1mol) terephthalic acid, 80.5g (0.4mol) 11-aminoundecanoic acid into the stirred polymerization reactor Add 2% (7.3g) of polyester amide, 0.5% (1.8g) of organic montmorillonite, 0.5% (1.8g) of benzoic acid, and 0.2% (0.7g) of N ,N`-bis(2,2,6,6-tetramethyl-4-piperidinyl)-1,3-phthalamide, add 100mL water as the mass and heat transfer medium; then vacuum for 5min, pass Nitrogen is applied for 5 minutes and circulates 6 times in this way, so that the reactants exist in the environment under the protection of nitrogen, and the system pressure in the stirred polymerization reactor is controlled to 0.3MPa;

[0090] (2) In 3.5 hours, heat the agitate...

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Abstract

The invention relates to high temperature resistant polyamide and a synthesis method thereof. The high temperature resistant polyamide has the structure as shown in the specification, wherein a=10-200, b=10-200, c=10-200, and R is polyester amide. The high temperature resistant polyamide has better mechanical properties and heat resistance, low water absorption and excellent processability and has the characteristic of biogenetic derivation, so that the high temperature resistant polyamide can be applied to the fields of electronic appliances, LEDs, vehicles, aerospace, war industry and the like.

Description

Technical field [0001] The present invention relates to the field of materials, in particular to high-temperature resistant polyamide and its synthesis method. Background technique [0002] In recent years, in order to meet the higher performance requirements in the fields of electronics, electrical appliances, automobiles, etc., especially with the development of Surface Mount Technology (SMT), ordinary high-temperature resistant engineering plastic polyphenylene sulfide (PPS) The heat resistance of) and liquid crystal polymer (LCP) can no longer fully meet their requirements, so the development of engineering plastics with higher heat resistance is inevitable. [0003] High temperature resistant polyamides are usually made by polycondensation of aliphatic diamines or diacids and diacids or diamines with aromatic rings. Due to the introduction of aromatic rings in the main chain of the polyamide molecule, its heat resistance and The mechanical properties have been improved, and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/44C08G69/36
CPCC08G69/36C08G69/44
Inventor 胡国胜王忠强张静婷石哲平师文博方春晖刘冰肖许和伟
Owner ZHONGBEI UNIV
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