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Nylon 1212 poweder and its preparing method

A technology of nylon and powder, which is applied in the field of nylon 1212 powder, can solve the problems of no products, etc., and achieve the effects of excellent wear resistance, excellent thermal insulation and good chemical properties

Inactive Publication Date: 2004-02-11
SHANDONG GUANGYIN NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Nylon 1212 powder should be a high-carbon nylon powder with excellent performance and wide application, but there is no such product at present

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Preparation of nylon 1212 salt

[0040] 1. Nitrilation reaction

[0041] Put 400Kg of dodecanedioic acid into the molten acid kettle, heat and melt, control the temperature of the kettle at 150-160°C, when the dibasic acid is completely melted, press it with compressed air to preheat it to 180-190°C, and Access to a certain amount of 18m 3 / h) Ammonia enters the nitrilation still, and after the pressing is completed, close the pressing valve, and open the heating system to heat up the nitrilation still. In the early stage, adjust the flow rate of ammonia gas to 25m 3 / h, react for 3 hours; mid-term, adjust the flow of ammonia gas at 10m 3 / h, react for 7 hours; in the later stage, adjust the flow rate of ammonia gas at 10m 3 / h, react for 5 hours. At this time, the temperature of the kettle is controlled at about 340° C. until the reaction is qualified, at which time the dodecanedioic acid is completely converted into dodecanedinitrile.

[0042] 2. Measure the ...

Embodiment 3

[0057] The preparation of nylon 1212 powder of the present invention:

[0058] 1. Mix nylon 1212 salt, phosphorous acid antioxidant, acetic acid molecular weight modifier and water initiator in a mixing machine at a weight ratio of 1:0.001:0.001:0.10, then put them into a polymerization kettle to heat up and polymerize. After heating up, keep the pressure at 2MPa for 3h, then exhaust steam and pressure evenly within 1.5h, keep the normal pressure for about 20min, and gradually evacuate to vacuum degree -0.095MPa, during which the reaction temperature is controlled at 220-230°C. When water is produced again, the end point of the reaction is reached, and a nylon 1212 resin product is obtained.

[0059] 2. Mix nylon 1212 resin with titanium dioxide, ultramarine blue, zinc oxide, and antioxidant 1010 in a high-speed kneader at a weight ratio of 1:0.15:0.0003:0.05:0.006, and then extrude through a twin-screw extruder Modification is carried out, and the extrusion temperature is co...

Embodiment 4

[0062] The preparation of nylon 1212 powder of the present invention:

[0063] 1. Mix nylon 1212 salt, phosphorous acid antioxidant, dodecanedibasic acid molecular weight regulator and water initiator in the mixer according to the weight ratio of 1:0.001:0.015:0.10, then put them into the polymerization kettle to heat up and polymerize . After heating up, keep the pressure at 1.8MPa for 2h, then exhaust the steam and pressure evenly within 1.6h, keep the normal pressure for about 35min, and gradually vacuumize to -0.096MPa, during which the reaction temperature is controlled at 220-230°C. When water is no longer produced, the end point of the reaction is reached, and a nylon 1212 resin product is obtained.

[0064] 2. Mix nylon 1212 resin with titanium dioxide, ultramarine blue, zinc oxide, and antioxidant phosphorous acid in a high-speed kneader at a weight ratio of 1:0.22:0.0003:0.09:0.012, and then proceed through a twin-screw extruder. Extrusion modification, controlling...

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PUM

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Abstract

Nylon 1212 salt, antioxidant and molecular weight regulator in the weight ratio of 1 to 0.0005-0.005 to 0.001-0.028 are polymerized into nylon 1212 resin. The nylon 1212 resin, titanium white powder, French blue, assistant and antioxidant in the weight ratio of 1 to 0.05-0.3 to 0.0001-0.0005 to 0.02-0.1 to 0.002-0.02 are extruded to modify in a double-screw extruder and produce nylon 1212 slice;and the slice is crushed, shaped and sieved to produce nylon 1212 powder. The nylon 1212 powder as one high-carbon material has low hydroscopicity, high size stability, excellent smelting flowability, excellent mechanism performance, excellent chemical performance and good electrically and thermally insulating performance, and may be used as paint for various pipelines.

Description

technical field [0001] The invention relates to a nylon 1212 powder technology, which belongs to the technical field of organic chemical industry. Background technique [0002] Powder coating is a new type of material that does not contain any organic solvents and is coated in powder form and forms a coating film. Powder coating and its electrostatic coating technology are another technology in the coatings industry after water-soluble electrophoretic coatings. revolution. Compared with the traditional solvent-based coatings in the past, powder coatings have the following advantages: (1) Powder coatings do not contain organic solvents, which avoids the fire, poisoning and unsafe problems in transportation caused by organic solvents; (2) there is no The air pollution caused by organic solvents meets the requirements for preventing air pollution; (3) The powder coating is a 100% solid system, and a closed-circuit circulation system can be used. The overflowing powder coating ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/12C08L77/00
Inventor 刘其永廖金玉周瑞圣王贻温
Owner SHANDONG GUANGYIN NEW MATERIALS
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