Microwave radiation polymerization method for polyamide

A technology of microwave radiation and polymerization method, which is applied in the field of microwave radiation polymerization of polyamide, can solve the problems such as the lack of reaction time and uniformity, the limitation of large-volume kettle-type equipment, and the limited penetration depth of microwaves.

Inactive Publication Date: 2011-05-11
深圳兰品科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, because the penetration depth of microwaves is limited, the penetration depth to water above 85°C is greater than 4cm (the penetration depth refers to the distance when the microwave power is attenuated to 36.8% (1 / e)), and it is applied in organic synthesis chemistry. During the reaction, the large-volume kettle-type equipment appears to be limited, and the reaction time and uniformity have little advantage, which is the bottleneck for the large-scale production of organic synthesis products by microwave

Method used

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  • Microwave radiation polymerization method for polyamide
  • Microwave radiation polymerization method for polyamide

Examples

Experimental program
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Effect test

Embodiment 1

[0054] According to the ratio of AH salt and adipic acid molar ratio 78 / 1, measure the AH salt of 38438.4g and the adipic acid of 436.4g, 80g1098, 80g168, 200g calcium stearate (adipic acid, 1098, 168, stearic acid Calcium is pre-mixed uniformly and added as an auxiliary agent) and evenly added to the first feeding port of the twin-screw extruder, and N 2 Protection, the screw speed is 350rpm, adjust the feeding speed so that the feeding amount is enough to fill the screw groove (neither make it overflow, nor make it hungry), so as to ensure that the AH salt can be enough to form a pressure seal in the reverse thread sealing section ; Sections 1, 2, and 3, control the temperature at 150°C to 250°C, inject water with a metering pump between 9 and 10D, and ensure that the AH salt concentration is between 70% and 90%. Control at 250-300°C, preferably 275-285°C, evacuate with a water ring vacuum pump to make the vacuum at the vacuum port ≥0.04MPa, extrude after microwave radiation...

Embodiment 2

[0057] Measure the AH salt of 69280g and 436.4g adipic acid, 140g1098, 140g168, 350g calcium stearate (adipate, 1098, 168, calcium stearate in advance according to the ratio of AH salt and adipic acid molar ratio 100 / 1) Mix evenly and add as a kind of auxiliary agent) and evenly add in the first feeding port of the twin-screw extruder, extrude and pelletize with the method of Example 1.

[0058] After testing, the relative viscosity of PA66 product is 3.25. The color of the product is good, and the extrusion is uniform and stable.

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Abstract

The invention discloses a microwave radiation polymerization method for polyamide, which adopts a double screw extruder reactor to realize massive continuous polymerization production of polyamide monomer. The polyamide is obtained by reaction between a monomer (I) A-R-A and a monomer (II) B-R'-B or between a monomer (III) A-R-Bf and a monomer (IV) A-R'-B or between corresponding lactams. In a formula, A is polymeric functional group, R is an aliphatic, alicyclic or aromatic substance with 4 to 12 carbon atoms based on hydrocarbon, B is the polymeric functional group, R' is the aliphatic, alicyclic or aromatic substance with 4 to 12 carbon atoms based on hydrocarbon, and f is total number of corresponding functional groups in the monomer; and microwaves are introduced into the double screw extruder, are heated and accelerate the polymerization reaction, so the method can produce polyamide products through polymerization quickly and continuously in low cost, and has obvious advantages compared with a common polymerization method. The obtained polyamide, copolyamide, hyperbranched polyamide and application thereof are all included in the invention.

Description

technical field [0001] The invention relates to a polyamide polymerization method, in particular to a polyamide microwave radiation polymerization method. Background technique [0002] Polyamide is commonly known as nylon (Nylon), the English name Polyamide, referred to as PA, is the general term for polymers containing amide groups (CONH-) in the repeating unit of the macromolecular main chain. Polyamides can be prepared by polycondensation of diamines and dibasic acids, by ring-opening polymerization of lactams, or by copolymerization of their necessary monomer mixtures. Now it has developed to use trifunctional or multifunctional monomers with Amino acids or diamines or dibasic acid monomers are used to synthesize hyperbranched polyamides with certain special properties. Since DuPont of the United States applied for the first nylon polymerization patent in 1931 and realized industrialization in 1939, through the unremitting efforts of many scientists, PA6, PA66, PA11, PA...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G69/00C08G69/04C08G69/28C08G69/36
Inventor 肖金亭
Owner 深圳兰品科技有限公司
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