PROCESS FOR PRODUCING MIXTURE OF TWO-LIQUID MIXING TYPE CURABLE RESIN AND PROCESS FOR PRODUCING HOLLOW-FIBER MEMBRANE FILTER ELEMENT

• US 20100044908A1
• Filed: 07/09/2007
• Published: 02/25/2010
• Est. Priority Date: 07/10/2006
• Status: Active Grant

• Current Assignee: Asahi Kasei Chemicals Corporation (Asahi Kasei Corporation)
• Original Assignee: Asahi Kasei Chemicals Corporation (Asahi Kasei Corporation)
• Inventors: Watanabe, Akihiro, Ishibashi, Yuzuru
• Granted Patent: US 8,425,824 B2
• Time in Patent Office: Days
• US Class Current: 264/171.120
• CPC Class Codes: B01D 2323/42 Details of membrane preparation apparatus
• CPC Class Codes: B01D 63/0222 using centrifugal forces
• CPC Class Codes: B01D 63/023 Encapsulating materials
• CPC Class Codes: B01D 63/0233 forming the bundle
• CPC Class Codes: B01D 63/033 Specific distribution of fibres within one potting or tube-sheet
• CPC Class Codes: B01F 25/42 in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
• CPC Class Codes: B01F 33/811 in two or more consecutive, i.e. successive, mixing receptacles or being consecutively arranged
• CPC Class Codes: B29B 7/005 for mixing in batches
• CPC Class Codes: B29B 7/7461 Combinations of dissimilar mixers
• CPC Class Codes: B29B 7/7466 Combinations of similar mixers

Abstract

An object of the present invention is to provide a process for producing a mixture of a two-liquid mixing type curable resin, which process is hard to generate curing unevenness, can be carried out with low energy consumption, and is suited for mixing even with a disposable static mixer.

The present invention provides a process for producing a mixture of a two-liquid mixing type curable resin by mixing the constituents of the resin, wherein mixing operations of the constituents are performed multiple times and a non-mixing time is provided between at least one of the mixing operations and another one of the mixing operations subsequent thereto.

Claims

1. A process for producing a mixture of a two-liquid mixing type curable resin, comprising mixing constituents of the two-liquid mixing type curable resin,

wherein mixing operations of the constituents are carried out multiple times, a non-mixing time is provided between at least one of the mixing operations and another one of the mixing operations subsequent thereto, and a total time TN of the non-mixing time is adjusted to from 2 to 100 times as much as a total time of the mixing operations.

2. The process according to claim 1, wherein the at least one of the mixing operations and the another one of the mixing operations subsequent thereto are carried out in one mixer.

3. The process according to claim 1, wherein the at least one of the mixing operations and the another one of the mixing operations subsequent thereto are carried out in mixers different from each other.

4. The process according to claim 3, wherein the at least one of the mixing operations is carried out in a static mixer or a mixing tank equipped with a stirrer and the another one of the mixing operations subsequent thereto is carried out in a static mixer or a mixing tank different from the static mixer or the mixing tank employed for the at least one of the mixing operations.

5. The process according to claim 4, wherein the static mixer or the mixing tank employed for the at least one of the mixing operations and the static mixer or the mixing tank employed for the another one of the mixing operations subsequent thereto are connected in series via a non-stirring portion.

6. The process according to claim 1, wherein the two-liquid mixing type curable resin has a pot life TP from 5 to 60 minutes.

7. The process according to claim 6, wherein a total time TN of the non-mixing time is from 0.001 to 0.5 times as much as the pot life TP.

8. The process according to claim 1, wherein the two-liquid mixing type curable resin is a urethane resin.

9. A process for producing a mixture of a two-liquid mixing type curable resin, comprising mixing constituents of the two-liquid mixing type curable resin,

wherein the constituents are fed into a mixing channel in which two or more static mixers are arranged in series, a non-stirring portion having no mixing element is disposed between at least one of the static mixers and another one of the static mixers placed downstream thereof, and a total volume of the non-stirring portion is from 2 to 10 times as much as a total volume of mixing portions of the static mixers.

10. The process according to claim 9, wherein the non-stirring portion is made of a flexible tube.

11. The process according to claim 9, wherein the two-liquid mixing type curable resin has a pot life TP from 5 to 60 minutes.

12. The process according to claim 11, wherein a total time TN of the non-mixing time during which the constituents pass through the non-stirring portion is from 0.001 to 0.5 times as much as the pot life TP.

13. The process according to claim 9, wherein the two-liquid mixing type curable resin is a urethane resin.

14. A process for producing a hollow-fiber membrane filter element, comprising a step of injecting a mixture of a two-liquid mixing type curable resin produced by a process according to claim 9 into an end portion of a hollow-fiber membrane bundle composed of a plurality of hollow-fiber membranes and solidifying the mixture, thereby bonding and fixing the end portion of the hollow-fiber membrane bundle.

15. The process for producing a hollow-fiber membrane filter element according to claim 14, wherein the mixture of the two-liquid mixing type curable resin is injected into the end portion of the hollow-fiber membrane bundle by a centrifugal force.

16. The process for producing a hollow-fiber membrane filter element according to claim 14, wherein the mixture of the two-liquid mixing type curable resin is obtained by feeding the constituents to the mixing channel by a centrifugal force.

17. A process for producing a hollow-fiber membrane filter element, comprising:

a mixing step of carrying out at least one mixing operation of constituents of a two-liquid mixing type curable resin to obtain a mixed liquid and then providing a non-mixing time; and

a fixing step of feeding the mixed liquid into a static mixer by a centrifugal force to obtain a mixture of the two-liquid mixing type curable resin, injecting the mixture of the two-liquid mixing type curable resin into an end portion of a hollow-fiber membrane bundle by a centrifugal force and solidifying the mixture, thereby bonding and fixing the end portion of the hollow-fiber membrane bundle.

18. The process for producing a hollow-fiber membrane filter element according to claim 17, wherein in the mixing step, a total non-mixing time TN is from 2 to 100 times as much as a total time TB of the mixing operation.

19. The process for producing a hollow-fiber membrane filter element according to claim 17, wherein the two-liquid mixing type curable resin has a pot life TP from 5 to 60 minutes.

20. The process for producing a hollow-fiber membrane filter element according to claim 19, wherein a total time TN of the non-mixing time is from 0.001 to 0.5 times as much as the pot life TP.

21. The process for producing a hollow-fiber membrane filter element according to claim 17, wherein the two-liquid mixing type curable resin is a urethane resin.