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Dope of acidic phosphate in use for jet printing symbols in high temperature

An acid and coating technology, applied in the field of acid phosphate coatings, directly printing marks on high-temperature steel billets and steel coils, can solve problems such as restrictions on popularization and application, corrosion of other equipment, packaging containers, high acidity, etc., to reduce corrosion, The effect of improving the adhesion firmness and satisfying the performance

Active Publication Date: 2010-02-24
CNOOC CHANGZHOU PAINT & COATINGS IND RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the raw materials used are stable at high temperature, the acidity of the coating is too high (pH value of 1-2 at room temperature), not only must use special spraying equipment, but also cause corrosion of other equipment and packaging containers, and the popularization and application are limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1 prepares adhesive A

[0024] raw material:

[0025] used as PO 4 3- The raw material is phosphoric acid; used as Al 3+ The raw material is Al(OH) 3 ; used as Mg 2+ The raw material is Mg(OH) 2 ;

[0026] Preparation steps:

[0027] ①Press PO 4 3- :Al 3+ : Mg 2+ The molar ratio is 2.5:1:0.6, and the raw material phosphoric acid, Al(OH) 3 , Mg(OH) 2

[0028] ② first mix all phosphoric acid with 1 / 2 Al(OH) 3 and 1 / 2 Mg(OH) 2 Add to the reactor, stir until transparent;

[0029] ③Add water and the remaining 1 / 2Al(OH) 3 , stirring and reacting for 1h;

[0030] ④Add the remaining 1 / 2Mg(OH) 2 , continue to stir and react for 1h;

[0031] ⑤Raise the temperature to 70-80°C, then stir and react for 2h;

[0032] ⑥ Discharging and settling naturally, the upper layer of transparent liquid is adhesive A, with a solid content of 55%.

Embodiment 2

[0033] Embodiment 2 prepares adhesive B

[0034] raw material:

[0035] used as PO 4 3- The raw material is phosphoric acid; used as Al 3+ The raw material is Al(OH) 3 used as Mg 2+ The raw material is MgO;

[0036] Preparation steps:

[0037] ①Press PO 4 3- :Al 3+ :Mg 2+ The molar ratio is 2.1:1:0.4, and the raw material phosphoric acid, Al(OH) 3 , MgO;

[0038] The following steps are the same as in Example 1 to prepare adhesive B with a solid content of 60%.

Embodiment 3

[0041] Get 100g (in solids) of the inorganic adhesive A prepared in Example 1, add 20g of anatase titanium dioxide, 2g of Tween 80, adjust the solid content of the coating to 45% with water, stir evenly, and grind in a ceramic ball mill for 12h. Promptly make the acidic phosphate coating of the present invention, its pH value is 3.

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PUM

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Abstract

This invention relates to acidic phosphate paint for high-temperature spraying onto steel green bodies and steel coils. The acidic phosphate paint comprises: adhesive, pigment and dispersant at a weight ratio of 100: (5-25): (0.5-10). The adhesive is a transparent liquid containing acidic aluminum phosphate and magnesium phosphate, and the solid content is 40-70 wt.%. In the raw materials of the adhesive, the mol ratio of PO43-, Al3+ and Mg2+ is (2.1-3.0) : 1 : (0.4-0.6). The paint has the solid content of 25-50 wt.%, and a pH value of 2-4. The paint has such advantages as stable properties and low corrosion, and can be directly sprayed onto steel green bodies and steel coils higher than 200 deg.C. The obtained patterns have high adhesiveness.

Description

technical field [0001] The invention belongs to inorganic high-temperature coatings, and relates to an acidic phosphate coating used for high-temperature spray-printing marks, and is particularly suitable for directly spray-printing marks on high-temperature steel billets and steel coils. Background technique [0002] At present, steel billets, steel coils and other products produced by steel mills need to be marked to record relevant information, such as: production unit, product type, serial number, production date, etc., so as to facilitate product management and quality tracking. Because steel billets and steel coils need to be marked immediately after they come out of the production equipment, and the surface temperature of these products is very high at this time, the usual spray printing coatings cannot obtain complete, clear and firm marks. CN1470570 discloses a "high-temperature billet marking spray printing paint", which is mixed with titanium dioxide, silicon diox...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D1/00
Inventor 狄志刚付敏袁立新朱晓丰许后麟
Owner CNOOC CHANGZHOU PAINT & COATINGS IND RES INST
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