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Method for preparing powder of nylon

A technology of nylon powder and nylon, which is applied in the chemical industry, can solve the problems of difficult recovery and treatment of aqueous solution, limited application range, difficulty in controlling the ratio of additives and polyamide resin, etc., and achieves the effects of easy implementation, convenient procurement, and good powder fluidity

Inactive Publication Date: 2006-04-19
SHANDONG GUANGYIN NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method can only produce products with smaller particle sizes, and it is difficult to recycle the aqueous solution dissolved with water-soluble polymers. Other additives in the polyamide resin are easily dispersed into the water-soluble polymers and are difficult to control. The ratio of other additives to polyamide resin limits its range of application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Nylon 1212 resin, antioxidant 1010 (chemical name: tetrakis [β-(3,5-di-tert-butyl 4-hydroxyphenyl) propionate] pentaerythritol ester), titanium dioxide and ethanol weight ratio 93.5:0.5:6: 300, nozzle nozzle diameter 1mm.

[0024] The process is as follows: add nylon resin, ethanol and additives into a high-pressure stirred tank, stir and heat, heat to 150°C and keep the temperature under stirring for 30 minutes. At this time, the pressure is about 1MPa.

[0025] The high-temperature and high-pressure mixed material is pressurized and transported to the pressure spray dryer for spray drying through the insulation pipeline. After the material is pressurized, the spray pressure is 1.8Mpa. Adjust the power and air volume of the dryer to keep the temperature at the air inlet at 140±5°C. The temperature of the air outlet was kept at 85±5°C, and the nylon powder was collected at the outlet of the dryer to obtain a nylon powder with an average particle size of 120 μm.

Embodiment 2

[0027] The autoclaved stirred tank was kept at 145°C for 30 minutes. At this time, the pressure is about 0.9 MPa, and the other is the same as in Example 1 to obtain nylon powder with an average particle size of powder of 120 μm.

Embodiment 3

[0029] The spray nozzle diameter is 1.5 mm, and the others are the same as in Example 1, and the nylon powder with an average particle size of powder of 150 μm is obtained.

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Abstract

A process for preparing the nylon powder includes such steps as dissolving nylon resin in alcohol-type solvent, and pressure-type spray drying. Said solvent can be recovered for reuse.

Description

technical field [0001] The invention relates to an improved preparation method of nylon powder, which belongs to the technical field of chemical industry. Background technique [0002] Nylon-based powder coatings have high chemical resistance and good mechanical properties. At present, the methods for obtaining nylon powder generally include cryogenic pulverization, solvent precipitation, and direct polymerization. [0003] Among them, cryogenic crushing uses a pulverizer to cool and crush in liquid nitrogen. This method has a relatively simple process, but cryogenic equipment is required, and a large amount of cryogenic carriers are needed in the production process, and the shape of the particles obtained by crushing is irregular, which is difficult to obtain. Spherical particles with wide particle size distribution, accompanied by degradation and loss of resin. [0004] The solvent precipitation method is to choose a certain solvent, nylon, which has good solubility at hi...

Claims

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Application Information

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IPC IPC(8): C08J3/12C08L77/00
Inventor 王明吉田家强徐忠波房永民周瑞圣
Owner SHANDONG GUANGYIN NEW MATERIALS
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