KR890001868A - Treatment Method of Separator for Sodium Hydrosulfite Diaphragm Tank - Google Patents

Abstract

No content

Description

Treatment Method of Separator for Sodium Hydrosulfite Diaphragm Tank

Since this is an open matter, no full text was included.

1 is a schematic exploded view of an electrolyzer using the coated separator of the present invention showing electrolyte flow passages and ion flow passages.

Claims (18)

(a) removing surface contaminants from the polymer mesh material; (b) an acid, titanium halide, surfactant, and water selected from the group consisting of hydrochloric acid, hydrobromic acid and hydrofluoric acid, mixed together to form an intermediate acidic titanium solution, and then the pH ranges from about 3.0 to 4.0 Contacting the polymer mesh material with an aqueous acidic titanium halide solution prepared by adding an alkali metal hydroxide to an intermediate titanium solution until (c) drying the titanium chloride solution on the surface of the polymer mesh material to form a coating; (d) converting the coating into titanium dioxide coating by contacting the coating with an oxidant selected from the group consisting of sodium hypochlorite, calcium hypochlorite, hydrogen peroxide and chlorine dioxide and having a predetermined open area in the surface thereof; A method of applying a solution to a polymer mesh material used as a separator in an electrolytic diaphragm between a membrane and a diaphragm and converting the solution into a hydrophilic coating on the polymer mesh material to increase the wettability of the surface of the polymer mesh material. The method according to claim 1, wherein the aqueous acidic titanium chloride solution contacting the polymer mesh material is (i) an acid selected from the group consisting of hydrochloric acid, hydrobromic acid and hydrofluoric acid to form an intermediate acidic titanium solution. By weight, about 1 to about 5 parts by weight titanium chloride, about 0.05 to about 0.5 parts by weight of the surface active agent and about 100 parts by weight of water are mixed together and (ii) from about 5 to about 4.0 until a pH of about 3.0 to about 4.0 A process prepared by adding 20 parts by weight of alkali metal hydroxide to an intermediate acidic titanium solution. The method of claim 1, wherein the aqueous acidic titanium chloride contacting the polymer mesh material comprises (i) about 10 parts by weight about 25% by weight titanium chloride in about 5 parts by weight hydrochloric acid to form an intermediate acidic titanium solution, about 0.1 parts by weight A surface active agent, about 100 parts by weight of water is mixed together and (ii) slowly added about 10 parts by weight of about 5% by weight sodium hydroxide to the intermediate acidic solution until the pH is in the range of about 3.0 to about 4.0. The method of claim 1, wherein the intermediate acidic titanium solution is left to stir for an hour before use. The method according to claim 4, wherein the coating of the intermediate acidic titanium solution is dried until it turns from blue to light yellow. 6. The method of claim 5 comprising drying the coating of the intermediate acid titanium solution by using hot air. The method of claim 6 comprising removing surface contaminants from the surface of the polymeric mesh material by washing in a detergent solution containing sodium hypochlorite, sodium tripolyphosphate and a surfactant. 8. The method of claim 7, wherein the surface of the polymer mesh material is made by roughening. 8. The method of claim 7, comprising washing excess detergent solution at the polymer surface of the polymer mesh material. 10. The method of claim 9 comprising washing the excess detergent solution and then drying the surface of the polymeric mesh material. The method of claim 10 wherein the polymeric mesh material is formed from polypropylene. The method of claim 11, wherein the polymeric mesh material is formed from the group consisting of nilo, polyethylene, and polyester. The method of claim 1, wherein the surface active agent in the intermediate acidic titanium solution is non-ionic. The method of claim 13, wherein the titanium dioxide coating covers at least about 50% and preferably about 80% of the surface of the polymer mesh material. The method of claim 14, wherein the contact angle of the polymeric mesh material with the coating thereon is about 5 degrees. To form an intermediate acidic titanium solution, a titanium solution having about 0.1 to about 1.0 parts by weight of hydrochloric acid, about 1 to about 15 parts by weight of titanium chloride, about 0.05 to about 0.5 parts by weight of surfactant, and about 100 parts by weight of water is mixed together. Forming, by oxidation on the surface, a titanium coating of dry coating formed by adding about 5 to about 20 parts by weight of about 5% sodium hydroxide to maintain the pH in the titanium solution at about 3.0 to about 4.0 during oxidation. Semi-transparent hydrophilic coating of titanium dioxide covering at least 50% of the surface of the polymer mesh material. (a) removing contaminants from the substrate surface; (b) mixing an acid selected from the group consisting of hydrofluoric acid, hydrobromic acid, hydrochloric acid, titanium chloride, a surfactant, and water together to form an intermediate acidic titanium solution, and then having a pH in the range of about 3.0 to about 4.0. Contacting the surface with an aqueous acidic titanium chloride solution prepared by adding an alkali metal hydroxide to the intermediate acidic titanium solution until it is obtained; (c) drying the titanium chloride solution on the surface of the trachea to form a coating; (d) converting the coating on the substrate into a titanium dioxide coating on site by contacting the coating with an oxidant selected from the group consisting of sodium hypochlorite, calcium hypochlorite, hydrogen peroxide and chlorine dioxide. How to apply coating. 18. The method of claim 17, wherein the aqueous acidic titanium chlorine solution in contact with the surface comprises (i) about 0.1 to about 1.0 parts by weight of acid selected from the group consisting of hydrochloric acid, hydrobromic acid and hydrofluoric acid to form an intermediate acidic titanium solution. , About 1 to about 5 parts by weight of titanium chloride, about 0.05 to about 0.5 parts by weight of surfactant and about 100 parts by weight of water are mixed together and (ii) medium until the pH is in the range of about 3.0 to about 4,0. Prepared by adding about 5 to about 20 parts by weight of alkali metal hydroxide to an acidic titanium solution. ※ Note: The disclosure is based on the initial application.