Method for bonding stainless steel filter element end cover and filter screen

Abstract

The invention belongs to the field of fine chemical engineering, and relates to a treatment process of an adhesive bonding forming filter element, in particular to a method for bonding an end cover and a filter screen of a stainless steel filter element. The technical defect problem existing in the existing welding mode for connecting the stainless steel end cover and the filter screen is solved. The invention discloses a forming method for bonding an end cover and a filter screen of a stainless steel filter element by using an epoxy resin adhesive, the epoxy resin adhesive is a high-strength adhesive and can firmly bond a stainless steel material, so that the stainless steel material has very high compressive strength and tensile strength, and the epoxy resin material has relatively high corrosion resistance. The prepared epoxy resin glue can also greatly improve the corrosion resistance of the filter element end cover, and meanwhile, the epoxy resin glue can fill gaps, so that connection between stainless steel materials is smoother, the gaps between the materials can be effectively reduced, and the bonding performance is improved. The stainless steel end cover and the filter screen are bonded through the adhesive, and the defect that the stainless steel end cover and the filter screen are connected through welding can be effectively overcome.

Description

Technical Field

[0001] The invention relates to the field of fine chemicals, and relates to a processing process of an adhesive-bonded molded filter element, in particular to a method for bonding a stainless steel filter element end cover and a filter screen. Background Art

[0002] Stainless steel filter elements are generally connected by welding at the end cap and the filter mesh joint. During welding, uneven temperature, excessive welding stress, and material mismatch may cause defects such as cracks, pores, and welding deformation. These defects will affect the welding quality and thus the filtration accuracy, and also reduce the service life of the stainless steel filter element.

[0003] In order to avoid the defects of connecting the stainless steel end cover and the filter screen by welding, it is necessary to develop a new connection technology between the stainless steel filter element end cover and the filter screen. Summary of the invention

[0004] The invention aims to solve the technical defects of connecting a stainless steel end cover and a filter screen by welding at present, and provides a method for bonding a stainless steel filter element end cover and a filter screen.

[0005] The present invention is implemented by adopting the following technical scheme: an epoxy resin glue, wherein the epoxy resin glue is formulated as follows by weight: E-44 epoxy resin 100 parts 501 active diluent 10-15 parts DMP-30 0.3-0.5 parts 5 parts of diethylenetriamine Aluminum hydroxide 15-20 parts 651 polyamide resin 15 parts 2 parts of triethanolamine 18 parts of reduced iron powder.

[0006] The epoxy resin adhesive proposed by the present invention can firmly bond stainless steel materials through scientific proportioning, so that the stainless steel materials have high compressive strength and tensile strength. All the raw materials used are pure raw materials.

[0007] The process of bonding a stainless steel filter element end cover to a filter screen according to the present invention comprises the following steps: a. Select the stainless steel filter element end cap and degrease the bonding surface of the end cap; b. Prepare the chemical treatment liquid for pickling the stainless steel end caps, the weight ratio is as follows: 100 parts concentrated nitric acid 15 parts concentrated hydrochloric acid 5 parts concentrated hydrofluoric acid 20 parts distilled water Add distilled water, concentrated nitric acid, concentrated hydrochloric acid, and concentrated hydrofluoric acid into the beaker in sequence and stir to mix evenly; c. Heat the stainless steel end caps in an oven to 60°C, keep warm for 30 minutes, and scrub the bonding surface of the end caps with the chemical treatment solution configured in step b. After scrubbing, place them in an oven and dry them at 85±5°C for 1±0.1 hours before taking them out for use; d. Prepare the epoxy resin adhesive according to claim 1; e. After fully stirring the prepared epoxy resin glue, put it into a vacuum tank and evacuate it for 45 minutes; f. Take out the vacuumed epoxy resin glue and pour it into a clean medical syringe as an adhesive; g. Place the parts where the end cap and the filter screen need to be bonded in place and fix them; h. Slowly inject the adhesive in the syringe into the gap of the filter joint, and the injection edge should be flat; i. After injection, pre-cure at room temperature for 24 hours; j. Then put it into the oven for step drying, the drying temperature is as follows: Keep at room temperature for 0.5h---Keep at 40℃ for 2h---Keep at 60℃ for 3h---Keep at 80℃ for 2h---room temperature.

[0008] Furthermore, the method also includes step k. If there is glue deficiency in the bonded stainless steel filter element, a second glue repair can be performed. The adhesive can be re-prepared according to step dj, and the glue repair can be repeated until the bonding part of the stainless steel filter element is smooth and neat without glue deficiency defects.

[0009] Furthermore, in step a, the bonding part of the end cap is wiped twice with a clean white thick cloth dipped in aviation cleaning gasoline, and then carefully wiped twice with acetone to remove surface grease.

[0010] Furthermore, in step c, the bonding surface of the end cap is scrubbed multiple times with a brush dipped in the prepared chemical treatment liquid. After the scrubbing is completed, the residual liquid on the surface is rinsed off with 30-40°C pure water, and the water marks are wiped off with a clean white silk cloth, and the end cap is placed in an oven and dried at 85°C for 1 hour before being taken out for use.

[0011] Furthermore, the mass percentage of nitric acid in the concentrated nitric acid is 68%, the mass percentage of hydrochloric acid in the concentrated hydrochloric acid is 36%, and the mass percentage of hydrofluoric acid in the concentrated hydrofluoric acid is 41%.

[0012] In order to avoid the defects of connecting the stainless steel end cap and the filter screen by welding, the present invention discloses a molding method for bonding the stainless steel filter element end cap and the filter screen with epoxy resin adhesive. Epoxy resin adhesive is a high-strength adhesive that can firmly bond the stainless steel material to make it have high compressive strength and tensile strength. The epoxy resin material has strong corrosion resistance. The prepared epoxy resin adhesive can also greatly improve the corrosion resistance of the filter element end cap. At the same time, the epoxy resin adhesive can fill the gap, making the connection between the stainless steel materials smoother, which can effectively reduce the gap between the materials and improve the bonding performance. The use of adhesive to bond the stainless steel end cap and the filter screen can effectively avoid the defects of welding to connect the stainless steel end cap and the filter screen. DETAILED DESCRIPTION

[0013] The present invention proposes to use epoxy resin glue to bond the stainless steel filter element end cover and the filter screen. After the end cover is degreased and chemically treated, the stainless steel end cover and the filter screen are bonded with epoxy resin glue. After bonding, defects such as cracks and pore deformation can be avoided. The strength after bonding can meet the use requirements. At the same time, the corrosion resistance is better after bonding with epoxy resin glue.

[0014] The following is a specific embodiment of the present invention, which comprises the following steps: a. Select the stainless steel filter element end cap, degrease the bonding surface of the end cap, use a clean white thick cloth dipped in aviation cleaning gasoline, wipe the bonding part of the end cap twice, and then wipe it carefully twice with acetone to remove surface grease.

[0015] b. Prepare the chemical treatment solution for pickling the stainless steel end caps. The formula is as follows (by weight ratio): Concentrated nitric acid (68wt%) 100 parts Concentrated hydrochloric acid (36wt%) 15 parts Concentrated hydrofluoric acid (41wt%) 5 parts 20 parts distilled water Add distilled water, concentrated nitric acid, concentrated hydrochloric acid and concentrated hydrofluoric acid into the beaker in sequence and stir to mix evenly.

[0016] c. Heat the stainless steel end caps in an oven to 60°C, keep warm for 30 minutes, then use a brush dipped in the prepared chemical treatment liquid to scrub the bonding surface of the end caps several times. After scrubbing, rinse off the residual liquid on the surface with 30-40°C pure water, wipe off the water marks with a clean white silk cloth, put them in an oven, dry them at 85°C for 1 hour, and then take them out for use.

[0017] d. Prepare epoxy resin glue in the following proportions (by weight): E-44 epoxy resin 100 parts 501 active diluent 10-15 parts DMP-30 0.3-0.5 parts 5 parts of diethylenetriamine Aluminum hydroxide 15-20 parts 651 polyamide resin 15 parts 2 parts of triethanolamine 18 parts of reduced iron powder (The above raw materials are all pure raw materials, among which diethylenetriamine is analytical grade) e. After fully stirring the prepared epoxy resin glue, put it into a vacuum tank and evacuate it for 45 minutes.

[0018] f. Take out the vacuumed adhesive and pour it into a clean medical syringe.

[0019] g. Place the parts where the end cap and filter screen need to be bonded into place and secure them.

[0020] h. Slowly inject the adhesive in the syringe into the gap of the filter joint, and the injection edge should be flat.

[0021] i. After injection, pre-cure at room temperature for 24 hours.

[0022] j. Then put it into the oven for step drying, the drying temperature is as follows: RT (0.5h) ---40℃ (2h) ---60℃ (3h) ---80℃ (2h) ---RT k. If there is glue deficiency in the bonded filter element, it can be refilled for the second time. Re-prepare the adhesive according to step dj and repeat the process to refill until the bonding part of the filter element is smooth and neat without glue deficiency. The shear strength of epoxy resin and stainless steel after bonding is greater than 20Mpa.

Claims

1. An epoxy resin adhesive, characterized in that: The epoxy resin glue is proportioned as follows by weight: E-44 epoxy resin 100 parts 501 active diluent 10-15 parts DMP-30 0.3-0.5 parts 5 parts of diethylenetriamine Aluminum hydroxide 15-20 parts 651 polyamide resin 15 parts 2 parts of triethanolamine 18 parts of reduced iron powder.

2. The epoxy resin adhesive according to claim 1, characterized in that: All the raw materials used were pure.

3. A method for bonding a stainless steel filter element end cap to a filter screen, characterized in that: The following steps are involved: a. Select the stainless steel filter element end cap and degrease the bonding surface of the end cap; b. Prepare the chemical treatment liquid for pickling the stainless steel end caps, the weight ratio is as follows: 100 parts concentrated nitric acid Concentrated hydrochloric acid 15 parts 5 parts concentrated hydrofluoric acid 20 parts distilled water Add distilled water, concentrated nitric acid, concentrated hydrochloric acid, and concentrated hydrofluoric acid into the beaker in sequence and stir to mix evenly; c. Heat the stainless steel end caps in an oven to 60°C, keep warm for 30 minutes, and scrub the bonding surface of the end caps with the chemical treatment solution configured in step b. After scrubbing, place them in an oven and dry them at 85±5°C for 1±0.1 hours before taking them out for use; d. Prepare the epoxy resin adhesive according to claim 1 or 2; e. After fully stirring the prepared epoxy resin glue, put it into a vacuum tank and evacuate for 45 minutes; f. Take out the vacuumed epoxy resin glue and pour it into a clean medical syringe as an adhesive; g. Place the parts where the end cap and the filter screen need to be bonded in place and fix them; h. Slowly inject the adhesive in the syringe into the gap of the filter joint, and the injection edge should be flat; i. After injection, pre-cure at room temperature for 24 hours; j. Then put it into the oven for step drying, the drying temperature is as follows: Keep at room temperature for 0.5h, 40℃ for 2h, 60℃ for 3h, 80℃ for 2h, and then at room temperature.

4. A method for bonding a stainless steel filter element end cap to a filter screen as claimed in claim 3, characterized in that: The method also includes step k. If there is glue deficiency in the bonded stainless steel filter element, a second glue repair can be performed. The adhesive is re-prepared according to step dj, and the glue repair is repeated until the bonding part of the stainless steel filter element is smooth and neat without glue deficiency defects.

5. A method for bonding a stainless steel filter element end cover to a filter screen as claimed in claim 3 or 4, characterized in that: In step a, use a clean white thick cloth dipped in aviation cleaning gasoline to wipe the bonding area of ​​the end cap twice, and then wipe it carefully twice with acetone to remove surface grease.

6. A method for bonding a stainless steel filter element end cover to a filter screen as claimed in claim 3 or 4, characterized in that: In step c, use a brush dipped in the prepared chemical treatment liquid to brush the bonding surface of the end cover several times. After brushing, rinse the residual liquid on the surface with 30-40℃ pure water, wipe the water marks with a clean white silk cloth, put it in an oven, dry it at 85℃ for 1 hour, and then take it out for use.

7. A method for bonding a stainless steel filter element end cap to a filter screen as claimed in claim 5, characterized in that: In step c, use a brush dipped in the prepared chemical treatment liquid to brush the bonding surface of the end cover several times. After brushing, rinse the residual liquid on the surface with 30-40℃ pure water, wipe the water marks with a clean white silk cloth, put it in an oven, dry it at 85℃ for 1 hour, and then take it out for use.

8. A method for bonding a stainless steel filter element end cap to a filter screen as claimed in claim 3 or 4, characterized in that: The mass percentage of nitric acid in concentrated nitric acid is 68%, the mass percentage of hydrochloric acid in concentrated hydrochloric acid is 36%, and the mass percentage of hydrofluoric acid in concentrated hydrofluoric acid is 41%.

9. A method for bonding a stainless steel filter element end cap to a filter screen as claimed in claim 5, characterized in that: The mass percentage of nitric acid in concentrated nitric acid is 68%, the mass percentage of hydrochloric acid in concentrated hydrochloric acid is 36%, and the mass percentage of hydrofluoric acid in concentrated hydrofluoric acid is 41%.

10. A method for bonding a stainless steel filter element end cap to a filter screen as claimed in claim 6, characterized in that: The mass percentage of nitric acid in concentrated nitric acid is 68%, the mass percentage of hydrochloric acid in concentrated hydrochloric acid is 36%, and the mass percentage of hydrofluoric acid in concentrated hydrofluoric acid is 41%.

11. A method for bonding a stainless steel filter element end cap to a filter screen as claimed in claim 7, characterized in that: The mass percentage of nitric acid in concentrated nitric acid is 68%, the mass percentage of hydrochloric acid in concentrated hydrochloric acid is 36%, and the mass percentage of hydrofluoric acid in concentrated hydrofluoric acid is 41%.