IP Library › Granted Patent US 12678767
Granted Patent B2
US 12678767 · App. 17/294,133 · Granted Jul 14, 2026

Coating solution

Inventors: Hiromichi Matsumoto (Tokyo, JP); Shinichi Ogura (Tochigi, JP); Ken Shinoda (Tochigi, JP); Toru Hosi (Tokyo, JP)
Assignee: NITTETSU MINING CO., LTD.
B01J20/22B01D39/1653B01D39/2072B01J20/103B01J20/28004B01J20/28019B01J20/3042B01D2239/1241
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Quick Facts
Patent No.
US 12678767
App. No.
17/294,133
Granted
Jul 14, 2026
Kind
B2
Abstract

Provided is a coating solution for forming a dust collecting layer, wherein the coating solution can be applied uniformly, and the formed dust collecting layer does not easily peel off from a filter element material, and allows to collect fine powder products having a small particle size. The coating solution is for forming a dust collecting layer in a dust collecting filter, and contains a fine powder, dopamine hydrochloride, and an adhesive.

Claims (18)

1 . A coating solution for forming a dust collecting layer in a dust collecting filter, comprising:

(i) a powder consisting of organic fine particles or inorganic fine particles,

(ii) dopamine hydrochloride, and

(iii) a water-soluble adhesive,

wherein the powder is any one of selected from the group consisting of silica, alumina and hematite,

wherein an average particle size D50 of the powder is 3.7 μm to 30.0 μm, and

wherein the coating solution is produced by the following in this order:

(1) pouring a powder consisting of organic fine particles or inorganic fine particles and a water-soluble adhesive in a buffer solution,

(2) stirring the mixture to homogeneity, and then

(3) adding dopamine hydrochloride.

2 . The coating solution for forming a dust collecting layer in a dust collecting filter according to claim 1 , wherein the powder is spherical silica.

3 . A method for producing a coating solution for forming a dust collecting layer in a dust collecting filter, comprising the following in this order:

(1) pouring a powder consisting of organic fine particles or inorganic fine particles and a water-soluble adhesive in a buffer solution,

(2) stirring to homogeneity the mixture, and then

(3) adding dopamine hydrochloride,

wherein the powder is any one of selected from the group consisting of silica, alumina and hematite, and

wherein an average particle size D50 of the powder is 3.7 μm to 30.0 μm.

4 . The coating solution of claim 1 , wherein the coating solution comprises the dopamine hydrochloride in an amount of 9.96 wt % to 15.14 wt % and the water-soluble adhesive in an amount of 4 wt % to 10 wt %.