METHOD FOR PREPARING FLAKY IRON OXIDE

Abstract

The invention discloses a method for preparing a flaky iron oxide. The flaky iron oxide is obtained through a vacuum coating machine. The vacuum coating machine includes a vacuum pump, a vacuum pipeline arrangement, a vacuum coating chamber, a flaky iron oxide supporting chamber and an electrical discharging gas inlet. High-energy particles generated by an iron oxide target are deposited on the surface of the conveying belt; and then the flaky iron oxide on a conveying belt is stripped and calcined to obtain the flaky iron oxide with bright color. By means of the method, vacuum sputtering time can be controlled to prepare the flaky iron oxide with various diameter-to-thickness ratios, and pollution caused by a traditional chemical deposition preparation method can be avoided. The preparation method is simple and environment-friendly. Due to the adoption of roller transmission, the production efficiency is improved.

Claims

1. A vacuum coating machine for preparing a flaky iron oxide, wherein the flaky iron oxide is obtained by the vacuum coating machine; the vacuum coating machine comprising: a vacuum pump; a vacuum pipeline arrangement; a vacuum coating chamber comprising a shell, and a bottom of the vacuum coating chamber being provided with a target mounting platform; a flaky iron oxide supporting chamber located below the vacuum coating chamber; and an electrical discharging gas inlet; wherein a flaky iron oxide receiving disc connected with the flaky iron oxide supporting chamber is arranged above the target mounting platform; a plurality of large rollers and small rollers are uniformly arranged in the vacuum coating chamber and are connected with each other through a conveying belt; heating equipment is arranged on the two sides of the vacuum coating chamber; and scrapers for stripping flaky iron oxides are symmetrically arranged in the middle of the vacuum coating chamber and are controlled by scraper controllers.

2. The vacuum coating machine for preparing the flaky iron oxide according to claim 1, wherein the vacuum coating machine is vertical or horizontal.

3. The vacuum coating machine for preparing the flaky iron oxide according to claim 1, wherein the conveying belt is a plastic film, flexible metal film, or rubber film conveying belt.

4. The vacuum coating machine for preparing the flaky iron oxide according to claim 3, wherein the plastic film conveying belt is specifically a high-temperature-resistant polytetrafluoroethylene plastic film, Teflon film or polyimide plastic film conveying belt, the flexible metal film conveying belt is a stainless steel film conveying belt, and the rubber film conveying belt is a fluororubber film conveying belt.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0028] FIG. 1 is a schematic structural view of a vacuum coating machine of the present invention;

[0029] FIG. 2 is a schematic structural view of a vacuum coating chamber;

[0030] Numeral References: 1. vacuum pump; 2. vacuum pipeline arrangement; 3. vacuum coating chamber; 301. shell; 302. heating equipment; 303. conveying belt; 304. large roller; 305. iron oxide target; 306. target mounting platform; 307. scraper controller; 308. scraper; 309. small roller; 310. flaky iron oxide receiving disc; 311. flaky iron oxide; 4. flaky iron oxide supporting chamber; 5. electrical discharging gas inlet.

DETAILED DESCRIPTION

[0031] The following describes the preferred embodiment of the present invention in more detail to make the advantages and features of the present invention more readily understood by those skilled in the art and further to define the protection scope of the present invention.

EXAMPLE 1

[0032] Disclosed is a method for preparing a flaky iron oxide. The flaky iron oxide is obtained by a vacuum coating machine. As shown in the accompanying drawings, the vacuum coating machine includes a vacuum pump 1, a vacuum pipeline arrangement 2, a vacuum coating chamber 3, a flaky iron oxide supporting chamber 4 and an electrical discharging gas inlet 5; the flaky iron oxide supporting chamber 4 is located below the vacuum coating chamber 3; the vacuum coating chamber 3 includes a shell 301; the bottom of the vacuum coating chamber 3 is provided with a target mounting platform 306; a flaky iron oxide receiving disc 310 connected with the flaky iron oxide supporting chamber 4 is arranged above the target mounting platform 306; a plurality of large rollers 304 and small rollers 309 are uniformly arranged in the vacuum coating chamber 3 and are connected with each other through a conveying belt 303; heating equipment 302 is arranged on the two sides of the vacuum coating chamber; and scrapers 308 for stripping flaky iron oxides 311 are symmetrically arranged in the middle of the vacuum coating chamber 3 and are controlled by scraper controllers 307.

[0033] In this example, the vacuum coating machine is vertical and convenient to operate.

[0034] In this example, a fluororubber film conveying belt is used as the conveying belt.

[0035] In this example, the target mounting platform of the iron oxide is located at the center line of the vacuum coating chamber to ensure coating uniformity.

[0036] The method for preparing the flaky iron oxide includes the following steps:

[0037] (1) iron oxide powder is pressed to form the shape of a cake, and is then mounted on the target mounting platform 306 of the vacuum coating chamber 3, the surface of the conveying belt 303 is cleaned by using ethanol, and the sputtering direction of a target is controlled, to ensure that iron oxide particles are deposited on the surface of the conveying belt 303;

[0038] (2) the vacuum coating chamber 3 is closed, the vacuum pump 1 is started, and the vacuum coating chamber 3 is vacuumized;

[0039] (3) when the vacuum degree of the vacuum coating chamber 3 reaches 6.2*10.sup.−3 Pa, the heating equipment 302 is started, and the vacuum coating chamber 3 is heated to 200° C. for exhausting to ensure the vacuum degree of the vacuum coating chamber 3;

[0040] (4) argon is introduced at the rate of 0.3 ml/min, and electrical discharging is performed to excite the iron oxide target to generate high-energy particles to be deposited on the surface of the conveying belt 303;

[0041] (5) the large rollers and the small rollers are started to enable the surface of the conveying belt 303 to be uniformly plated with the flaky iron oxide 311, exhausting is performed after coating is completed, then the scraper controllers 308 are started, and the flaky iron oxide 311 on the conveying belt 303 is stripped into the flaky iron oxide receiving disc 310 by the scrapers 308; and

[0042] (6) the temperature in the vacuum coating chamber 3 is increased to 650° C., the flaky iron oxide 311 in the flaky iron oxide receiving disc 310 is calcined for 10 minutes, and then the processed flaky iron oxide 311 is introduced into the flaky iron oxide supporting chamber 4 below the vacuum coating chamber 3 for collection.

[0043] The flaky iron oxide prepared by the method is uniform in thickness, good in transparency, smooth in surface and rich in metal luster, and can meet requirements of high-grade cosmetics and high-grade pearlescent pigments.

[0044] The foregoing is an example of the present invention and does not constitute a limitation on the scope of the present invention. Any equivalent structure or equivalent process change made by using the description of the present invention, or direct or indirect application thereof in other related technical fields, shall still fall in the protection scope of the patent of the present invention.