A kind of super weather-resistant PVDF double-layer powder coating and preparation method thereof

A technology of powder coating and super weather resistance, applied in the direction of powder coating, polyester coating, coating, etc., can solve the problems of high process control requirements, lack of substantial experimental basis, lack of equipment, etc., to improve adhesion, overcome Poor dispersibility and coating adhesion, and the effect of solving cumbersome processes

Active Publication Date: 2020-03-27
广东华江粉末科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This preparation process is very cheap and safe, but the requirements for process control are relatively high. Due to the simple bonding, the resin has no wetting process to other materials, and there are hidden dangers of poor material dispersibility and unstable powder particles, which increases the cost of the powder after use. Ultrafine powder recycling fee
[0008] The above four methods all have different technical difficulties. Methods 1 and 2 have been used in actual production, but both methods have certain defects in process or cost; and methods 3 and 4 are more due to the lack of perfect equipment, lack of Substantial experimental basis, etc., but no industrial application so far

Method used

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  • A kind of super weather-resistant PVDF double-layer powder coating and preparation method thereof
  • A kind of super weather-resistant PVDF double-layer powder coating and preparation method thereof
  • A kind of super weather-resistant PVDF double-layer powder coating and preparation method thereof

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Experimental program
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preparation example Construction

[0059] The curing agent includes one or more of polycarboxylic acid, polybasic acid anhydride, isocyanate, triglycidyl isocyanurate, hydroxyalkylamide, etc., wherein the polycarboxylic acid includes adipic acid, decanedidioic acid acid, dodecanedioic acid, tetradecanedioic acid, octadecanedioic acid; the isocyanate includes blocked trimethylolpropane diisocyanate adduct, blocked isophorone One or more of diisocyanate trimer, hexamethylene diisocyanate adduct, tetramethoxymethyl glycoluril, diketal diisocyanate adduct, caprolactam-blocked isophorone diisocyanate, etc. kind. The preparation method of described PVDF (polyvinylidene fluoride) two-layer powder coating, its flow process is as attached figure 1 shown, including the following steps:

[0060] (1) Pre-mix and melt-mix the raw materials of the above-mentioned component B formula according to their corresponding weight percentages, perform tablet cooling, and finally crush and sieve them into powder particles with a med...

Embodiment 1

[0069] Prepare samples 1-3 of super weather-resistant PVDF double-layer powder coating according to the following steps:

[0070] (1) Premix the following components A and B respectively according to the weight percentage:

[0071]

[0072]

[0073] (2) After pre-mixing the raw materials of the above-mentioned component B, use a twin-screw extruder to melt, knead, disperse and extrude evenly. 145-155℃, extrusion screw frequency 30-50Hz; tableting, coarse crushing;

[0074] (3) The coarsely crushed material is graded and crushed with an ACM mill, the frequency of the main mill is 40-55Hz, and the frequency of the auxiliary mill is 25-45Hz, and the finely crushed material is classified into a modified powder coating through a 160-180 mesh standard sieve;

[0075] (4) Pre-mix some of the raw materials in the above component A formula and add them to the reaction kettle. The input sequence of the raw materials and the corresponding operations are as follows: pre-mix PVDF fl...

Embodiment 2

[0107] Prepare super weather-resistant PVDF double-layer powder coating samples 6-8 according to the following steps:

[0108] (1) Premix the following E and F component raw materials respectively according to the weight percentage:

[0109]

[0110]

[0111] (2) After pre-mixing the raw materials of the above-mentioned component F, use a twin-screw extruder to melt, knead, disperse and extrude evenly. 145-155℃, extrusion screw frequency 30-50Hz; tableting, coarse crushing;

[0112] (3) The crushed material is graded and crushed with an ACM mill, the frequency of the main mill is 40-55Hz, and the frequency of the auxiliary mill is 25-45Hz, and the finely crushed material is classified into a modified powder coating through a 160-180 mesh standard sieve;

[0113] (4) Premix the raw materials in the above component E formula and add them into the reactor. After mixing, put it into the reaction kettle, stir evenly and adjust the stirring frequency, the temperature rises t...

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Abstract

The invention provides a super-weather-resistant PVDF double-layer powder paint and a preparation method thereof. The method includes the steps that acrylic resin or saturated carboxyl-terminated polyester resin or saturated hydroxyl-terminated polyester resin, combined with corresponding curing agents, additives, pigments, fillers and other materials, are firstly subjected to melt extrusion and pulverization to prepare a single-component powder paint with a suitable particle size; then PVDF resin, combined with corresponding additives, pigments and other materials, are subjected to pre-mixingto prepare ultra-fine single-component powder particles, and by controlling parameters such as main shaft frequency, temperature and thermal insulation time of agglomeration dispersing equipment, thetwo single-component powder above is bonded and agglomerated to produce the high-performance PVDF double-layer powder paint. The adhesion and powder stability of the PVDF fluorocarbon powder paint are significantly improved through optimization of a formula and innovation of a semi-melting and semi-bonding process, and the problems of poor surface flatness and impact resistance of existing domestic PVDF fluorocarbon powder paints and difficulty in industrialization are solved.

Description

technical field [0001] The invention belongs to the field of powder coatings, and in particular relates to a super weather-resistant PVDF double-layer powder coating and a preparation method thereof. Background technique [0002] PVDF fluorocarbon powder coatings appeared in the 1970s, and the current market share is still very low. On the one hand, the reason is that the advantages of solvent-based PVDF coatings are obvious, and powder-based PVDF coatings are difficult to achieve; The special properties of the resin make the industrial production of PVDF powder coatings very difficult. In recent years, the demand for fluorocarbon powder coatings in the domestic powder coating industry has become more and more vigorous; many buildings in the Middle East abroad require coatings to be free of solvents and have weather resistance to meet the AAMA2605-2005 standard, and the demand for fluorocarbon powder coatings is growing; The demand for fluorocarbon powder coatings in Asia a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D127/16C09D133/04C09D133/02C09D167/00C09D5/03C09D7/65C09D7/61
CPCC08L2205/02C08L2205/035C09D5/032C09D5/033C09D127/16C09D133/02C09D133/04C09D167/00
Inventor 魏育福黄焯轩吴严明南仁植蔡劲树刘飞
Owner 广东华江粉末科技有限公司
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