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Thermoset fluororesin powder coating preparation method

A powder coating and fluororesin technology, applied in powder coatings, coatings and other directions, can solve the problems of partial gel and even coking particles, the decline of physical properties of coating and coating films, and difficulty in process control, and achieve good storage stability at room temperature, The effect of good product quality and simplified preparation process

Inactive Publication Date: 2015-09-23
JUHUA GROUP TECH CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In view of the above situation, the method of spray drying will cause difficulties in process control
However, when a kettle-type continuous vacuum precipitation device or a thin film evaporation device is used, the processing temperature is usually higher (above the softening temperature of the resin), and the residence time of the resin in the precipitation device is long, so it is easy to produce partial gel or even coking Particles are also likely to cause discoloration of the resin
In order to maintain the performance of powder resin or paint, it is necessary to filter the gel particles, but even so, the decline in the physical properties of the coating and coating film cannot be completely avoided

Method used

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  • Thermoset fluororesin powder coating preparation method
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  • Thermoset fluororesin powder coating preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0036] (1) Through the cycle process of vacuuming and high-purity nitrogen replacement, deoxidize the high-pressure reactor to make the oxygen content in the reactor less than 23ppm. Then, by weight fraction, add 100 parts of methyl isoamyl ketone, 100 parts of butanol, 8 parts of hydroxyethyl vinyl ether, 25 parts of n-butyl vinyl ether, Veova9 monomer (tertiary carbonate monomer produced by Shell Corporation) trade name) 10 parts, 1 part of crotonic acid, 1 part of tert-butyl peroxy tert-valerate, the kettle was replaced twice with high-purity nitrogen again, and after removing the residual oxygen in the solvent, trifluorochlorine was introduced 55 parts of vinyl. After stirring and slowly raising the temperature to 55°C for 12 hours of polymerization, the temperature of the reactor was lowered to 30°C with cooling water, and the unreacted gas-phase monomer was recovered and discharged. The feed solution is filtered with diatomaceous earth to remove the insoluble matter and...

Embodiment 2

[0041] Preparation method is with embodiment 1, and difference is:

[0042] Step (1) Polymerization formula and process parameters are shown in Table 3;

[0043] The specific formula when step (3) is mixed is 250 parts of thermosetting fluororesin powder, 40 parts of titanium dioxide (R-960, DuPont), 45 parts of blocked isocyanate curing agent (B1540, Degussa company), leveling agent (368P , BYK) 2.5 parts, defoamer (benzoin, Henan Wanbo) 3 parts.

Embodiment 3

[0045] Preparation method is with embodiment 1, and difference is:

[0046] Step (1) Polymerization formula and process parameters are shown in Table 3;

[0047] The specific formula when step (3) is mixed is 350 parts of thermosetting fluororesin powder, 70 parts of titanium dioxide (R-960, DuPont), 90 parts of blocked isocyanate curing agent (7992, Bassington), leveling agent ( 368P, BYK) 5 parts, defoamer (benzoin, Henan Wanbo) 6 parts.

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Abstract

The invention discloses a thermoset fluororesin powder coating preparation method. The method includes the steps that firstly, by weight, 65-200 parts of polymerized media, 45-60 parts of fluorine-containing monomers, 5-14.5 parts of hydroxyl monomers, 25.5-50 parts of other monomers and 0.6-2 parts of initiators react with one another at the temperature of 45 DEG C to 95 DEG C for 5 h to 40 h, cooling, discharging and filtering are conducted, and a thermoset fluororesin transparent solution is obtained; secondly, the obtained thermoset fluororesin transparent solution is dried, and thermoset fluororein powder is obtained; thirdly, after thermoset fluororesin powder, titanium dioxide, blocking isocyanate curing agents, flatting agents and defoaming agents are mixed to obtain the mixture, the mixture is fed into a double-screw extruder to be melted, extruded and cooled, and the thermoset fluororesin coating mixture is obtained; finally, the thermoset fluororesin coating mixture is smashed, grinded, filtered and graded, and a thermoset fluororesin powder coating is obtained. The thermoset fluororesin powder coating preparation method has the advantages of being simple in process, high in powder yield and excellent in product performance.

Description

technical field [0001] The invention relates to a preparation method of a fluorine-containing coating, in particular to a preparation method of a thermosetting fluororesin powder coating. Background technique [0002] Thermosetting fluorine-containing resin coatings have extraordinary weather resistance, corrosion resistance and antifouling properties, and are widely used in: emerging marine engineering - offshore facilities, coastal and bay structures and offshore oil drilling platforms, etc.; modern transportation - bridges , ships, containers, trains, automobiles, highway and railway guardrails, etc.; important energy industries - oil pipelines, oil tanks, power transmission and transformation equipment, nuclear power equipment and coal mining equipment, etc.; large industrial and mining enterprises - chemical, petrochemical, steel, fertilizer Pipelines, storage tanks, equipment and smelting equipment of large mines, etc. [0003] On the other hand, thermosetting fluoroc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D127/12C09D5/03C09D7/12C08F214/24C08F216/14C08F216/18C08F218/04C08F220/04
Inventor 裴金东肖瑞厚刘海波张广欣王树华余晓斌
Owner JUHUA GROUP TECH CENT