CN108610864B - A coating for preventing tar from adhering to a coking board in a coking process and a method of using the same - Google Patents

Abstract

A coating for preventing tar from adhering to a coking board in a coking process and a method for using the same. The weight percentages of the components are: a base material, a fluorine-propylene synthetic resin emulsion, the dosage of the fluorine-propylene emulsion is 30-50%, and the solid content of the emulsion is 45-50%. 65%; additives, 0.1%-1.0%; wherein, leveling agent, polysiloxane-polyether copolymer, polydimethylpolysiloxane compound or polyether-modified polydimethylsiloxane; Defoamer, polyether modified silicone oil; dispersant, two substances of sodium tripolyphosphate and styrene-maleic anhydride copolymer; the ratio of the above three is: 25-35%: 15-25%: 45 ‑55%; fillers, titanium dioxide or/and calcium carbonate, 20‑40%; balance water. The coating of the present invention is used for spraying or smearing on the coke oven dripping board after the coke pushing operation is completed, the furnace door is closed, and the coke dripping board is cleaned, which can reduce the tar and asphalt substances produced in the coking process. Adhesion on the surface, so as to achieve the purpose of easy cleaning.

Description

A coating for preventing tar from adhering to a coking board in a coking process and a method of using the same

technical field

The invention belongs to the field of coatings, and in particular relates to a coating for preventing tar from adhering to a coke dripping plate in a coking process and a method for using the same. Adhesion on the coke plate for easy cleaning.

Background technique

In the coking process, coal is heated in the carbonization chamber isolated from air, and undergoes drying and dehydration, thermal cracking, semi-coking and coking, and finally forms coke. In the process of high temperature cracking to form coal gas and semi-coke, liquid tar-like substances are generated, namely coal tar, which is a black or brown-black viscous liquid with a pungent odor. This liquid tar-like substance will seep out along the sealing surface between the knife edge of the furnace door and the mirror surface of the furnace frame, drip onto the coke dripping plate under the furnace door, and solidify at room temperature to form pollution. The cured tar is dripping coke The adhesion on the board is strong, which brings greater difficulty to manual cleaning or automatic cleaning in the future.

According to the existing coking process, it is basically impossible to prevent liquid tar-like substances from dripping on the coke plate, so how to reduce the adhesion of the solidified tar on the coke plate to facilitate manual cleaning or automatic cleaning in the future seems very important.

Aiming at the adhesive properties of liquid tar after curing on a coke plate, the present invention provides a new type of fluorocarbon resin emulsion green and environment-friendly spray paint.

Fluorocarbon coatings based on water-based fluorocarbon emulsion resins were successfully developed in the mid-to-late 1990s. Due to the large electronegativity of the introduced fluorine element and the strong carbon-fluorine bond energy, the fluororesin coating has a certain surface tension to show oil pollution resistance, and also has high weather resistance, water resistance, and pollution resistance. This kind of coating is widely used in various fields of construction, chemical industry, electrical and electronic industry, machinery industry, aerospace industry, and household products.

Among all kinds of coatings, there is no precedent for using it in the coking process to prevent coal tar and pitch substances from adhering to the coking board, and there is no public report on the related technology after patent search. The traditional water-based fluorocarbon emulsion resin type coating is directly used on the coke oven dripping board, and there are still obvious defects in the performance of high temperature resistance, tar repellency, and asphalt adhesion to the coke dripping board. On the coke dripping board, a sufficient thickness cannot be formed to completely cut off the contact between tar, asphalt and other liquid substances and the coke dripping board.

SUMMARY OF THE INVENTION

The object of the present invention is to provide a coating for preventing tar from adhering to the coking plate in the coking process and a method of using the same, which is used for spraying or wiping on the coke after the coke pushing operation is completed, the furnace door is closed, and the coking plate is cleaned. The coke oven dripping board can reduce the adhesion of tar and asphalt substances produced in the coking process on the coke dripping board, so as to achieve the purpose of easy cleaning.

To achieve the above object, the technical scheme of the present invention is:

A coating for preventing tar from adhering to a coking board in a coking process, the composition weight percentages are: a base material, a fluoropropylene synthetic resin emulsion, the dosage of the fluoropropylene emulsion is 30-50%, and the solid content of the emulsion is 45-65%; additives; , 0.1%-1.0%; wherein, leveling agent, polysiloxane-polyether copolymer, polydimethylpolysiloxane compound or polyether-modified polydimethylsiloxane; defoamer, Polyether-modified silicone oils; dispersant, sodium tripolyphosphate and styrene-maleic anhydride copolymer, wherein the content of sodium tripolyphosphate is 40-60%; the ratio of the above three is: 25- 35%: 15-25%: 45-55%; filler, titanium dioxide or/and calcium carbonate, 20-40%; the balance is water.

Preferably, the filler further includes carbon black.

Preferably, the content of titanium dioxide in the filler is 25-35%, calcium carbonate is 55-65%, and carbon black is 5-15%, in weight percent.

The application method of the coating for preventing tar from adhering to the coke dripping plate in the coking process of the present invention is to smear or spray the coating on a clean coke oven dripping plate, the thickness of the coating film is 50-500 μm, and the consumption is 110-150 g/m ^2. The drying time is 5 to 15 minutes at 80 to 150°C.

Preferably, add water 5%-15% for dilution.

Aiming at the bonding characteristics of liquid tar after curing on the coke plate, the spray coating of the present invention takes the water-based fluoropropylene synthetic resin emulsion as the base material, and is matched with appropriate additives and fillers. The high temperature resistance is less than 200 ° C. After spraying on the coke plate And can form a certain thickness of the interlayer, and has a strong oil repellent properties.

In the composition design of the coating of the present invention:

(1) Selection of base material

The coating of the present invention selects fluoropropylene synthetic resin emulsion as the base material, and the emulsion is a coating and emulsion formed on the basis of acrylic monomer and grafted fluorocarbon resin. In the formula, the dosage of the fluoroacrylic emulsion is 30-50% by mass, the solid content of the emulsion is 45-65% by mass, and the characteristics are shown in Table 1.

Table 1

(2) Selection of additives

Additives, mainly play the role of coating film leveling, defoaming, and filler dispersion, using composite additives. The dosage of the additive of the present invention is 0.1%-1.0% by mass.

①Leveling agent:

Improve the fluidity and coverage of the coating film, reduce the surface tension of the coating film, increase the repellency of asphalt pollution, and increase the coverage of pores and unevenness of the coated base.

The present invention selects polysiloxane-polyether copolymer, polydimethylpolysiloxane compound or polyether-modified polydimethylsiloxane as leveling agent.

②Defoamer:

In view of the characteristics of fluoroacrylic emulsion resin and the requirement of coating film to resist coke oven asphalt pollution, the choice is to increase anti-pollution property, and at the same time take into account the requirements of water emulsion dispersion stability, especially polyether modified silicone oil is selected as defoamer. It is composed of high viscosity methyl silicone oil and silicone resin containing ultrafine silica.

③Dispersant:

According to the characteristics of inorganic fillers, carbon black and fluoropropylene synthetic resin emulsion matrix in coatings, it is selected with good dispersibility and flame retardancy at the same time. Specifically, there are two kinds of sodium tripolyphosphate and styrene-maleic anhydride copolymer, wherein the styrene-maleic anhydride copolymer mainly acts on carbon black, and the content is 40-60%.

(3) Selection of fillers

In order to ensure that the coating has a certain thickness after being sprayed on the coke oven dripping plate, the present invention selects titanium dioxide and calcium carbonate as fillers. The board loses its original color and sticks with black tar and asphalt substances, which are black and white, which affects the appearance. Therefore, the present invention also selects the method of adding carbon black powder to make the paint finally gray or gray black. In the whole filler, the content of titanium dioxide is 25-35%, calcium carbonate is 55-65%, and carbon black is 5-15%, all of which are mass percentages, and the average particle size is required to be less than 15 microns. The amount of filler in the coating is 20-40%.

Beneficial effects of the present invention:

The coating of the present invention has a wide selection of fluidity and coating thickness, so the method of coating on the surface of the coke dripping plate can be manual or automatic, and has wide applicability; The application can reduce the adhesion of tar and asphalt substances produced in the coking process on the coking board, and create conditions for automatic and unmanned cleaning in the coke oven area.

The coating of the invention is used for smearing or spraying on the coke dripping plate under the coke oven door after the coke pushing operation is completed, the furnace door is closed and the coke dripping plate is cleaned, so as to reduce the stickiness of the tar produced in the coking process on the coke dripping plate. Adhesion, so as to achieve the purpose of easy cleaning.

Detailed ways

The present invention will be further described below in conjunction with the embodiments.

See Table 2 for the composition of the coating examples of the present invention.

Before smearing or spraying the coating of the present invention on the coke oven dripping board, the surface of the coke dripping board must be kept clean, that is, the residual coal tar, asphalt, coke powder and other millimeter-scale particles on the surface of the coke dripping board must be removed. Smear or spray on the coke oven dripping board, the coating thickness is 50-500μm, the consumption is 110-150g/m ² , and the drying time is 5-15 minutes at 80-150 ℃.

The construction ratio can be appropriately diluted with 10% water according to the roughness of the surface of the coking board and the viscosity of the paint itself.

The properties of the coatings of the present invention are shown in Table 3.

Table 2 Examples

table 3

Claims (5)

1. A coating for preventing tar from adhering to a coke dripping plate in a coking process comprises the following components in percentage by weight:

the base material is fluorine-acrylic synthetic resin emulsion, the dosage of the fluorine-acrylic emulsion is 30-50%, and the solid content of the emulsion is 45-65%;

0.1 to 1.0 percent of additive; wherein,

leveling agent, polysiloxane-polyether copolymer, polydimethyl polysiloxane compound or polyether modified polydimethyl siloxane;

defoaming agents, polyether modified silicone oils;

dispersant, two substances of sodium tripolyphosphate and styrene-maleic anhydride copolymer;

wherein the content of the sodium tripolyphosphate is 40-60%;

the proportion of the three components is as follows: 25-35 percent, 15-25 percent and 45-55 percent;

20-40% of filler, titanium dioxide or/and calcium carbonate;

the balance being water.

2. The coating for preventing tar adhesion sagging of coke sheets produced during coking of claim 1, wherein said filler further comprises carbon black.

3. The coating for preventing tar from adhering to and flowing down a coke board in a coking process as claimed in claim 2, wherein the filler comprises 25-35% by weight of titanium dioxide, 55-65% by weight of calcium carbonate and 5-15% by weight of carbon black.

4. The use method of the coating for preventing tar from adhering to the coke dripping plate in the coking process as claimed in claim 1, 2 or 3, wherein the coating as claimed in claim 1 to 3 is applied or sprayed on the coke dripping plate of a clean coke oven, the thickness of the coating is 50-500 μm, and the consumption is 110-150g/m²The drying time is 5-15 minutes at 80-150 ℃.

5. The method of using the coating for preventing tar from adhering to a coke slab during a coking process as claimed in claim 4, wherein the coating is diluted with 5% to 15% of water.