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High-sphericity fine thermoplastic powder coating material and preparation method thereof

A powder coating and thermoplastic technology, used in the field of high sphericity fine thermoplastic powder coatings and preparation, can solve the problems of low fluidity affecting coating quality, and achieve the effects of good powder fluidity, reduced solvent consumption and high sphericity

Inactive Publication Date: 2020-06-26
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Aiming at the problem that the low fluidization degree of thermoplastic powder coating affects the quality of the coating when the particle size is small, the first purpose of the present invention is to propose a high-sphericity micro-fine thermoplastic powder coating

Method used

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  • High-sphericity fine thermoplastic powder coating material and preparation method thereof
  • High-sphericity fine thermoplastic powder coating material and preparation method thereof
  • High-sphericity fine thermoplastic powder coating material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] as per figure 1 Process flow shown:

[0054] Step 1: Take 1.2Kg of thermoplastic polymer polyethylene, 40g of pigment, 30g of antioxidant 1010, 300g of talcum powder filler, and 500g of sodium chloride soluble salt and add it to a plastic high-speed mixer and stir at a high speed. The stirring speed is 500rpm; the time of stirring is controlled After 30 minutes, disperse evenly, and then extrude into tablets through a co-rotating twin-screw extruder at 170°C;

[0055] Step 2: Put the compressed tablet obtained in Step 1 into a hob mill for coarse crushing to obtain a coarse powder; crush the obtained coarse powder through a jet mill, classify and sieve to obtain a fine polymer coarse material with a particle size below 30 μm , the grading speed of the jet mill is controlled at 1600rpm, and the air inlet of the jet mill assists in entering the liquid nitrogen gas;

[0056] Step 3: Soak the micronized coarse polymer material prepared in step 2 in clean water and wash it...

Embodiment 2

[0060] Step 1: Take 1.3Kg of thermoplastic polymer polyethylene, 40g of pigment, 40g of antioxidant 168, 300g of talcum powder filler, and 500g of sodium chloride soluble salt and add it to a plastic high-speed mixer and stir at a high speed. The stirring speed is 600rpm; the stirring time is controlled After 30 minutes, disperse evenly, and then extrude into tablets through a co-rotating twin-screw extruder at 170°C;

[0061] Step 2: Put the compressed tablet obtained in Step 1 into a hob mill for coarse crushing to obtain a coarse powder; crush the obtained coarse powder through a jet mill, classify and sieve to obtain a fine polymer coarse material with a particle size below 30 μm , the grading speed of the jet mill is controlled at 1600rpm, and the air inlet of the jet mill assists in entering the liquid nitrogen gas;

[0062] Step 3: Soak the micronized coarse polymer material prepared in step 2 in clean water and wash it, remove most of the soluble salts, centrifugally d...

Embodiment 3

[0065] Step 1: Take 1.4Kg of thermoplastic polymer polyethylene, 50g of pigment, 30g of antioxidant 1010, 300g of mica powder filler, 500g of sodium chloride soluble salt and add it into a plastic high-speed mixer and stir at a high speed. The stirring speed is 600rpm; the time of stirring is controlled After 30 minutes, disperse evenly, and then extrude into tablets through a co-rotating twin-screw extruder at 170°C;

[0066] Step 2: Put the compressed tablet obtained in Step 1 into a hob mill for coarse crushing to obtain a coarse powder; crush the obtained coarse powder through a jet mill, classify and sieve to obtain a fine polymer coarse material with a particle size below 30 μm , the grading speed of the jet mill is controlled at 1600rpm, and the air inlet of the jet mill assists in entering the liquid nitrogen gas;

[0067] Step 3: Soak the micronized coarse polymer material prepared in step 2 in clean water and wash it, remove most of the soluble salts, centrifugally d...

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Abstract

The invention relates to a thermoplastic powder coating material and a preparation method thereof, particularly to a high-sphericity fine thermoplastic powder coating material and a preparation methodthereof. The preparation method of the coating material comprises the following steps: adding a thermoplastic polymer, a pigment, an antioxidant, a filler and a soluble salt into a high-speed mixer,stirring at a high speed, uniformly dispersing, and extruding and tabletting through a screw extruder; feeding the tablets into a hob crusher, and coarsely crushing to obtain coarse powder; crushing the coarse powder by using a jet mill under a freezing condition, carrying out graded screening to obtain a fine polymer coarse material with a particle size of less than 30 [mu]m, soaking the fine polymer coarse material in clear water, cleaning, removing most soluble salts, carrying out centrifugal dehydration, and drying to obtain pretreated micronized polymer coarse powder; and suspending the pretreated fine polymer coarse powder in a high-speed airflow impact type powder surface modification device through high-speed airflow, and spraying a solvent at the same time so as to obtain the coating material. According to the invention, the solvent consumption is greatly reduced, and the obtained coating material powder has good fluidity.

Description

technical field [0001] The invention relates to a thermoplastic powder coating and a preparation method, in particular to a high-sphericity fine thermoplastic powder coating and a preparation method. Background technique [0002] At present, the pollution of volatile organic compounds (VOCs) in liquid coatings has pushed the coatings industry to the forefront of environmental protection many times. Powder coating is a 100% solid content, zero VOC coating. Since its birth, it has been recognized as an environmentally friendly coating and has quickly realized a subversive industrial replacement for solvent-based coatings in many traditional industrial fields. From traditional furniture and home appliances , aluminum profiles, transportation, energy and other industries to the shipbuilding industry, marine engineering and pipeline industry, have achieved very good results. Powder coating has low requirements on the environment, and various coating methods such as fluidized bed...

Claims

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Application Information

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IPC IPC(8): C09D123/06C09D5/03C09D7/61C09D7/63B02C21/00B29B9/04
CPCB02C21/00B29B9/04C08K2003/3045C09D5/033C09D123/06C08K13/02C08K3/34C08K5/1345C08K3/16C08K5/526C08K3/346C08K3/30
Inventor 曾军堂陈庆张俊何方陈涛
Owner CHENDU NEW KELI CHEM SCI CO LTD
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