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 i

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] Example 1

[0023] Nylon 1212 resin, antioxidant 1010 (chemical name: tetra[β-(3,5-di-tert-butyl 4-hydroxyphenyl) propionic acid] pentaerythritol ester), weight ratio of titanium dioxide to ethanol 93.5:0.5:6: 300, the nozzle diameter of the nozzle is 1mm.

[0024] The process is as follows: the nylon resin, ethanol and additives are respectively added to the high-pressure stirring vessel, stirred and heated, heated to 150°C, and kept at a constant temperature for 30 minutes under stirring. The pressure at this time is about 1 MPa.

[0025] The high-temperature and high-pressure mixture material is pressurized and transported to the pressure spray dryer for spray drying through the insulated pipeline. The spray pressure of the material is 1.8Mpa after pressurization. The power and air volume of the dryer are adjusted to keep the air inlet temperature at 140±5°C. The temperature of the air outlet is maintained at 85±5°C, and nylon powder is collected at the outlet of the dry...

Example Embodiment

[0026] Example 2

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

Example Embodiment

[0028] Example 3

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

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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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