AIR EXHAUST OR AIR-AND-SMOKE EXHAUST PIPE FOR CLEAN ROOM AND MANUFACTURING METHOD THEREFOR

Abstract

The present invention provides an air exhaust or air-and-smoke exhaust pipe for a clean room and a manufacturing method thereof. The air exhaust or air-and-smoke exhaust pipe is a pipe that satisfies FM4922, FM4910, or another equivalent standard and that is used for exhausting nonflammable chemical gas and corrosive vapor or nonflammable chemical gas, corrosive vapor and smoke in fire. The manufacturing method for the air exhaust or air-and-smoke exhaust pipe is: coating an inner part of a pre-manufactured metal pipe with a liquid coating that can be initially dried at normal temperature or low temperature to obtain an inner coating pipe; and baking the inner coating pipe at a temperature not exceeding 250 C. after the coating is initially dried, thus the coating is completely dried to obtain a finished product.

Claims

1. An air exhaust or air-and-smoke exhaust pipe for a clean room, manufactured by using a metal and a coating on the surface of the metal, wherein the coating comprises a first component and/or a second component, wherein the first component uses methyl, ethyl, and phenyl siloxane, methyl polysilicate methyl ester, a siloxane monomer, homopolymer, and copolymer of perfluoroalkyl, and a combination thereof as a first basic film former; and the second component uses a copolymer of fluorinated alkene and vinyl ether and a homopolymer of fluorinated (methyl) acrylate or a copolymer with another monomer as a second basic film former.

2. The air exhaust or air-and-smoke exhaust pipe for the clean room according to claim 1, wherein the fluorinated alkene is any one or more of chlorotrifluor ethylene, tetrafluoroethylene, polyvinylidene fluoride, vinyl fluoride, hexafluoropropylene, trifluoroethylene, trifluorobromoethylene, trifluoropropene, hexafluoroisobutene, and octafluoroisobutylene.

3. The air exhaust or air-and-smoke exhaust pipe for the clean room according to claim 1, wherein the air exhaust or air-and-smoke exhaust pipe satisfies a requirement of FM4922, FM4910, or an equivalent standard.

4. The air exhaust or air-and-smoke exhaust pipe for the clean room according to claim 1, wherein the metal is iron, aluminum, copper, or an alloy thereof.

5. A method for manufacturing the air exhaust or air-and-smoke exhaust pipe for the clean room according to claim 1, comprising the following steps: (1) preforming a metal into a pipe of a required shape or structure, and carrying out surface treatment on the pipe; (2) coating an inner part of the preformed metal pipe with the coating at normal temperature; (3) leaving the preformed pipe in a natural state for a period of time or irradiating the preformed pipe with ultraviolet light to make the coating being touch-dry and hard-dry at normal temperature to obtain an inner coating pipe; and (4) leaving the inner coating pipe for a relatively long time at normal temperature or baking the inner coating pipe at a temperature not higher than 250 C., to postcure the coating to obtain a finished product.

6. The method for manufacturing the air exhaust or air-and-smoke exhaust pipe for the clean room according to claim 5, wherein the coating is liquid during coating construction, and the coating is a solution, an emulsion, a solvent-free liquid mixture, or a suspensoid containing solid powder.

7. The method for manufacturing the air exhaust or air-and-smoke exhaust pipe for the clean room according to claim 5, wherein coating and touch dry temperatures of the coating are not higher than 35 C.

8. The method for manufacturing the air exhaust or air-and-smoke exhaust pipe for the clean room according to claim 5, wherein a postcure method in step (4) is placing the inner coating pipe into a baking oven or a baking room, or introducing hot air into the inner coating pipe.

9. The method for manufacturing the air exhaust or air-and-smoke exhaust pipe for the clean room according to claim 5, wherein the fluorinated alkene is any one or more of chlorotrifluor ethylene, tetrafluoroethylene, polyvinylidene fluoride, vinyl fluoride, hexafluoropropylene, trifluoroethylene, trifluorobromoethylene, trifluoropropene, hexafluoroisobutene, and octafluoroisobutylene.

10. The method for manufacturing the air exhaust or air-and-smoke exhaust pipe for the clean room according to claim 5, wherein the air exhaust or air-and-smoke exhaust pipe satisfies a requirement of FM4922, FM4910, or an equivalent standard.

11. The method for manufacturing the air exhaust or air-and-smoke exhaust pipe for the clean room according to claim 5, wherein the metal is iron, aluminum, copper, or an alloy thereof.

Description

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The present invention is further described below in detail with reference to specific implementations. The part described in the embodiments of the present invention indicate mass fraction unless particularly specified.

Embodiment 1

[0031] 100 parts of a 60% butanone solution (LUMIFLON LF200MEK, purchased from Asahi in Japan) of a copolymer of fluorinated alkene and vinyl ether are taken, 1 part of a thixotropic agent (purchased from HDK H18 in Wacker) is added, and the solution and the thixotropic agent are uniformly dispersed in a sand mill as component A. Polymeric MDI (purchased from Bayer 44V20) is component B.

[0032] Degreasing and drying treatment are carried out on an inner part of a 304 stainless steel pipe of a specification required by a corrosion resistance test, a horizontal pipe combustion test, a vertical/horizontal pipe combustion test, and a vertical pipe combustion test, and then the pipe is prepared for use. The component A and the component B are taken and uniformly mixed by weight ratio of 100:7-8, and is sprayed on an inner wall of the 304 stainless steel pipe prepared for use. After a coating is touch-dry, the pipe is after treated in a baking oven of 80 C. for four hours and then is taken out. After the pipe is cooled down to a normal temperature, a chemical-corrosion resistance test and a fire resistance test are performed.

Embodiment 2

[0033] 100 parts of an organic silicon resin (purchased from SILRES MSE 100 in Wacker) are taken, 1 part of a thixotropic agent (purchased from HDK H13L in Wacker) is added, and the organic silicon resin and the thixotropic agent are uniformly dispersed in a sand mill as component A of a coating. Tetrabutyl titanate is component B of the coating.

[0034] Degreasing and drying treatment are carried out on an inner part of a 304 stainless steel pipe of a specification required by a corrosion resistance test, a horizontal pipe combustion test, a vertical/horizontal pipe combustion test, and a vertical pipe combustion test, and then the pipe is prepared for use. The component A and the component B of the coating are taken and uniformly mixed by weight ratio of 100:3-6, and is sprayed on an inner wall of the 304 stainless steel pipe prepared for use. After the coating is touch-dry, the pipe is aftertreated in a baking oven of 80 C. for four hours and then is taken out. After the pipe is cooled down to a normal temperature, a chemical-corrosion resistance test and a fire resistance test are performed.

Embodiment 3

[0035] 100 parts of a 60% butanone solution (LUMIFLON LF200MEK, purchased from Asahi in Japan) of a copolymer of fluorinated alkene and vinyl ether are taken, 20 parts of ECTFE powder (purchased from SOLVAY) are added, and the solution and the CTFE powder are uniformly dispersed in a sand mill as component A of a coating. Polymeric MDI (purchased from Bayer 44V20) is component B of the coating.

[0036] Degreasing and drying treatment are carried out on an inner part of a 304 stainless steel pipe of a specification required by a corrosion resistance test, a horizontal pipe combustion test, a vertical/horizontal pipe combustion test, and a vertical pipe combustion test, and then the pipe is prepared for use. The component A and the component B of the coating are taken and uniformly mixed by weight ratio of 100:5-6, and is sprayed on an inner wall of the 304 stainless steel pipe prepared for use. After the coating is touch-dry, the pipe is after treated in a baking oven of 80 C. for four hours and then is taken out. Hot air of 250 C. is blew into the pipe for 20 minutes by using an air heater for further aftertreatment. After the pipe is cooled down to a normal temperature, a chemical-corrosion resistance test and a fire resistance test are performed.

Embodiment 4

[0037] 100 parts of an organic silicon resin (purchased from SILRES MSE 100 in Wacker) are taken, 20 parts of ECTFE powder (purchased from SOLVAY) are added, and the organic silicon resin and the ECTFE powder are uniformly dispersed in a sand mill as component A of a coating. Tetrabutyl titanate is component B of the coating.

[0038] Degreasing and drying treatment are carried out on an inner part of a 304 stainless steel pipe of a specification required by a corrosion resistance test, a horizontal pipe combustion test, a vertical/horizontal pipe combustion test, and a vertical pipe combustion test, and then the pipe is prepared for use. The component A and the component B of the coating are taken and uniformly mixed by weight ratio of 100:2.5-5, and is sprayed on an inner wall of the 304 stainless steel pipe prepared for use. After the coating is touch-dry, the pipe is after treated in a baking oven of 80 C. for four hours and then is taken out. Hot air of 250 C. is blew into the pipe for 20 minutes by using an air heater for further aftertreatment. After the pipe is cooled down to a normal temperature, a chemical-corrosion resistance test and a fire resistance test are performed.

[0039] Chemical-corrosion resistance test:

[0040] At 25 C., an inner surface of the pipe prepared in each of the foregoing embodiments is immersed in each the following media for eight hours, and then is removed and cleaned.

[0041] 1# medium: 75% sulfuric acid

[0042] 2# medium: 30% hydrochloric acid

[0043] 3# medium: a mixture of 30% hydrochloric acid and 30% hydrogen peroxide whose volume ratio is 1:1

[0044] 4# medium: saturated ammonia

[0045] After the foregoing reagents are treated, disadvantages and destruction are tested by using a microscope, and it is detected, by using an electrospark tester, whether there is leakage on a coating on the inner surface of the pipe.

[0046] Testing results are as follows:

TABLE-US-00001 Sample name 1# medium 2# medium 3# medium 4# medium Embodiment 1 Coating Coating Coating Coating completed completed completed completed and no and no and no and no leakage leakage leakage leakage Embodiment 2 Coating Coating Coating Coating completed completed completed completed and no and no and no and no leakage leakage leakage leakage Embodiment 3 Coating Coating Coating Coating completed completed completed completed and no and no and no and no leakage leakage leakage leakage Embodiment 4 Coating Coating Coating Coating completed completed completed completed and no and no and no and no leakage leakage leakage leakage

[0047] Fire resistance test:

[0048] The fire resistance test is performed according to the FM 4922 Certification Standards of Air Exhaust Pipe or Air-and-Smoke Exhaust Pipe.

[0049] In the horizontal pipe combustion test, a straight pipe whose diameter is 12 inches and horizontal length is 24 feet is placed on a testing apparatus. A combustion source is placed on one end of the pipe, a fan is mounted on the other end of the pipe, and flame is lit up and is sucked into the pipe. If all the following conditions are satisfied in a testing process for 15 minutes, the product performance is considered as being qualified:

[0050] 1. Flame in the pipe cannot extend to a place away from a flame exposure end by 23 ft (7.0 m).

[0051] 2. A temperature at a place of 23 ft (7.0 m) inside the pipe cannot exceed 1000 F. (538 C.).

[0052] 3. If the pipe and/or a mounting connector cannot maintain a complete structure, there is no burny or glowing particle after a dropped, dripped, or a melted pipe part or connector material gets into contact with the floor.

[0053] 4. No external burning is caused due to autoignition or temperature transfer inside the pipe. When burning of an external surface is caused during exposure to external flame, the flame should intermittently appear and cannot spread outside a range of the first connector that is away from the exposure end by 4 ft (1.2 m).

[0054] In the horizontal/vertical pipe combustion test, a 90 bent pipe whose diameter is 12 inches, vertical length is 15 feet, and horizontal length is 24 feet is placed on a testing apparatus. A combustion source is placed on one end of the pipe, a fan is mounted on the other end of the pipe, and flame is lit up and is sucked into the pipe. If all the following conditions are satisfied in a testing process for 15 minutes, the product performance is considered as being qualified:

[0055] 1. Flame in the pipe cannot spread to a place on a horizontal pipe segment away from a flame exposure end by 23 ft (7.0 m).

[0056] 2. Flame outside the pipe should be limited to a vertical pipe segment, and cannot spread to an external surface on the horizontal pipe segment.

[0057] 3. A temperature at a place of 23 ft (7.0 m) inside the pipe cannot exceed 1000 F. (538 C.).

[0058] 4. If the pipe and/or a mounting connector cannot maintain a complete structure, there is no burny or glowing particle after a dropped, dripped, or a melted pipe part or connector material gets into contact with the floor.

[0059] In the vertical pipe combustion test, a straight pipe whose diameter is 12 inches and vertical length is 15 feet is placed on a testing apparatus. A combustion source is placed on one end of the pipe, a fan is mounted on the other end of the pipe, and flame is lit up and is sucked into the pipe. If all the following conditions are satisfied in a testing process for 15 minutes, the product performance is considered as being qualified:

[0060] 1. Flame in the pipe cannot spread to a range within 10 ft (3.1 m) from a top end of the pipe.

[0061] 2. Flame outside the pipe cannot spread to a range within 5 ft (1.6 m) from the top end of the pipe.

[0062] 3. A temperature inside the pipe measured at a place away from the top end of the pipe by 1 ft (0.3 m) cannot exceed 1000 F. (538 C.).

[0063] 4. If the pipe and/or a mounting connector cannot maintain a complete structure, there is no burny or glowing particle after a dropped, dripped, or a melted pipe part or connector material gets into contact with the floor.

[0064] Testing results are as follows:

TABLE-US-00002 Horizontal/ Horizontal vertical Vertical Sample name pipe test pipe test pipe test Embodiment 1 Qualified Qualified Qualified Embodiment 2 Qualified Qualified Qualified Embodiment 3 Qualified Qualified Qualified Embodiment 4 Qualified Qualified Qualified

[0065] Although the implementations of the present invention are described in this specification, these implementations are merely used as presentations and should not limit the protection scope of the present invention. Various omissions, replacements, and changes made without departing from the scope of the present invention should all fall within the protection scope of the present invention.