Production process of high-flatness butyl adhesive tape

Abstract

The invention discloses a production process of a high-flatness butyl adhesive tape, and belongs to the technical field of adhesive tape processing, and the production process of the high-flatness butyl adhesive tape is characterized by comprising the following steps: S1, stirring raw materials for producing the butyl adhesive tape in a stirring furnace to form a rubber material, and vacuumizing the rubber material; s2, adding the rubber material obtained in the step S1 into an extruder for melt extrusion, and arranging a filter screen at the tail end of the extruder, which is connected with a mold; and S3, the adhesive tape extruded in the step S2 is subjected to water cooling and then rolled, and the technical effect of reducing the influence of bubbles and impurities on the surface flatness of the butyl adhesive tape is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of adhesive tape processing, in particular to a production process of a high-flatness butyl adhesive tape. Background Art

[0002] Butyl tape is an environmentally friendly solvent-free sealing adhesive material made from a blend of butyl rubber and polyisobutylene and other main raw materials. It has the characteristics of high strength, corrosion resistance, and good stability. It is suitable for waterproof sealing treatment of joints in various civil roofs, color steel, steel structures, etc.

[0003] The existing production method of butyl tape is as follows: the raw materials are stirred in a mixing furnace to be processed into rubber, and then the rubber is taken out of the mixing furnace for use. During extrusion production, the rubber is placed in a screw extruder for rotary extrusion. At the same time, a corresponding mold of the size required for molding is added to the discharge port of the extruder, and the mold needs to be heated so that the temperature of the mold is basically consistent with the temperature of the extruded tape. When the rubber is extruded into the mold for molding, the temperature can reach above 80°C. The extruded tape is air-cooled and then rolled up by a winding machine.

[0004] The existing problems in the production of butyl tapes are as follows: bubbles and impurities exist in the rubber compound during the processing of the raw materials into the rubber compound in the mixing furnace, and the presence of these bubbles and impurities causes the surface of the tape to be rough and uneven, and even forms bubbles, cracks and other defects on the surface of the tape, thereby affecting the quality of the product. Summary of the invention

[0005] In order to reduce the influence of bubbles and impurities on the surface flatness of a butyl tape, the present invention provides a production process for a high-flatness butyl tape.

[0006] The present invention provides a production process for a high-flatness butyl tape, which adopts the following technical solution: A production process of a high-flatness butyl tape comprises the following steps: S1. Stirring the raw materials for producing butyl tape in a stirring furnace to form a rubber compound, and performing a vacuum treatment on the rubber compound; S2, adding the rubber material obtained in step S1 into an extruder for melt extrusion, and a filter screen is provided at the end of the extruder where the mold is connected; S3, water-cooling the adhesive tape extruded in step S2 and then winding it up.

[0007] By adopting the above-mentioned technical scheme, the present application can effectively eliminate the bubbles in the rubber material after vacuuming the stirred and mixed rubber material, so that the surface of the extruded tape is smooth and free of bubbles. At the same time, after a filter screen is provided at the extrusion end of the extruder connecting the mold, the impurities in the rubber material can be effectively filtered to prevent the rubber material from being mixed with impurities during the process of stirring, discharging, transporting and feeding into the extruder, thereby effectively ensuring that the surface of the extruded tape is smooth, free of bubbles and impurities.

[0008] In addition, after the extruded tape is water-cooled, the heat on the surface and inside of the tape can be quickly dissipated, avoiding the problem of bubbles on the surface of the tape causing the surface of the tape to be uneven. At the same time, during water cooling, the surface temperature of the tape drops quickly, thereby effectively avoiding the problem of certain components in the tape decomposing due to the high internal temperature of the tape, thereby reducing the physical properties of the tape. In addition, after the extruded tape is water-cooled, it can effectively prevent the tape from deformation and ensure the appearance of the tape.

[0009] In a preferred embodiment, the vacuum degree during the vacuum treatment is -0.08 MPa to -0.1 MPa, and the vacuum treatment time is 20-30 min.

[0010] In a preferred embodiment, the mesh size of the filter is 30-60 meshes.

[0011] In a preferred embodiment, the water cooling means that the extruded adhesive tape enters a water tank and uses circulating cooling water to cool the adhesive tape.

[0012] In a preferred embodiment, the temperature of the water in the water tank is below 40°C.

[0013] In a preferred embodiment, the temperature of the adhesive tape extruded in step S2 when it exits the water tank is ≤40°C.

[0014] In summary, the present invention has the following beneficial effects: 1. The present application effectively removes bubbles and impurities in the rubber material by vacuuming the rubber material and filtering it before extrusion. At the same time, the tape is quickly cooled after extrusion to avoid deformation of the tape or carbonization due to excessive internal temperature. Therefore, the coordination between the various steps makes the surface of the tape smooth, free of bubbles and impurities, and there will be no deformation after winding, which effectively ensures the product quality of the butyl tape.

[0015] 2. The present application sets a water tank and controls the water temperature in the water tank to below 40°C, so that the temperature inside the tape after extrusion is also quickly reduced, thereby avoiding deformation or internal carbonization of the tape caused by untimely cooling. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below with reference to the embodiments.

[0017] Example 1 A production process of a high-flatness butyl tape comprises the following steps: S1. Add the raw materials for producing butyl tape into a stirring furnace and stir to form a rubber compound, and perform vacuum treatment on the rubber compound, wherein the vacuum degree is -0.08MPa and the vacuum treatment time is 20min; S2, adding the rubber material obtained in step S1 into an extruder for melt extrusion, and connecting a filter screen to the end of the extruder where the mold is connected, so that impurities in the rubber material can be filtered out when the rubber material is extruded by the extruder, wherein the mesh number of the filter screen is 30 meshes; S3. A water trough is provided in the direction of the discharge end of the extruder, and the water inlet and outlet of the water trough are connected to a cooling tower to realize circulating cooling of the extruded tape. At the same time, the temperature of the water in the water trough is monitored in real time to ensure that the temperature of the water in the water trough is always less than 40°C. In addition, in order to ensure that the temperature inside the tape is fully dissipated, the length of the water trough is at least 2m, so that the temperature of the tape is less than or equal to 40°C when the tape exits the water trough, effectively preventing the deformation of the tape and the decomposition of the internal components. Then, the tape extruded in step S2 is introduced into the water trough, and is rolled up after water cooling to obtain a butyl tape, wherein the specification of the obtained butyl tape is thickness × width: 3×12mm.

[0018] Example 2 A production process of a high-flatness butyl tape comprises the following steps: S1. Add the raw materials for producing butyl tape into a stirring furnace and stir to form a rubber compound, and then perform a vacuum treatment on the rubber compound, wherein the vacuum degree is -0.09MPa and the vacuum treatment time is 25min; S2, adding the rubber material obtained in step S1 into an extruder for melt extrusion, and connecting a filter screen to the end of the extruder where the mold is connected, so that impurities in the rubber material can be filtered out when the rubber material is extruded by the extruder, wherein the mesh number of the filter screen is 50 meshes; S3. A water trough is provided in the direction of the discharge end of the extruder, and the water inlet and outlet of the water trough are connected to a cooling tower to realize circulating cooling of the extruded tape. At the same time, the temperature of the water in the water trough is monitored in real time to ensure that the temperature of the water in the water trough is always less than 40°C. In addition, in order to ensure that the temperature inside the tape is fully dissipated, the length of the water trough is at least 2m, so that the temperature of the tape is less than or equal to 40°C when the tape exits the water trough, effectively preventing the deformation of the tape and the decomposition of the internal components. Then, the tape extruded in step S2 is introduced into the water trough, and is rolled up after water cooling to obtain a butyl tape, wherein the specification of the obtained butyl tape is thickness × width: 3×12mm.

[0019] Example 3 A production process of a high-flatness butyl tape comprises the following steps: S1. Add all raw materials for producing butyl tape into a stirring furnace and stir to form a rubber compound, and perform vacuum treatment on the rubber compound, wherein the vacuum degree is -0.1MPa and the vacuum treatment time is 30min; S2, adding the rubber material obtained in step S1 into an extruder for melt extrusion, and connecting a filter screen to the end of the extruder where the mold is connected, so that impurities in the rubber material can be filtered out when the rubber material is extruded by the extruder, wherein the mesh number of the filter screen is 60 meshes; S3. A water trough is provided in the direction of the discharge end of the extruder, and the water inlet and outlet of the water trough are connected to a cooling tower to realize circulating cooling of the extruded tape. At the same time, the temperature of the water in the water trough is monitored in real time to ensure that the temperature of the water in the water trough is always less than 40°C. In addition, in order to ensure that the temperature inside the tape is fully dissipated, the length of the water trough is at least 2m, so that the temperature of the tape is less than or equal to 40°C when the tape exits the water trough, effectively preventing the deformation of the tape and the decomposition of the internal components. Then, the tape extruded in step S2 is introduced into the water trough, and is rolled up after water cooling to obtain a butyl tape, wherein the specification of the obtained butyl tape is thickness × width: 3×12mm.

[0020] Comparative Example 1 A production process of a high-flatness butyl tape comprises the following steps: S1. Add all raw materials for producing butyl tape into a stirring furnace and stir to form a rubber compound, and perform vacuum treatment on the rubber compound, wherein the vacuum degree is -0.1MPa and the vacuum treatment time is 30min; S2, adding the rubber material obtained in step S1 into an extruder for melt extrusion, and connecting a filter screen to the end of the extruder where the mold is connected, so that impurities in the rubber material can be filtered out when the rubber material is extruded by the extruder, wherein the mesh number of the filter screen is 60 meshes; S3. The tape extruded in step S2 is rolled up to obtain a butyl tape, wherein the specification of the obtained butyl tape is thickness×width: 3×12 mm.

[0021] Comparative Example 2 A production process of a high-flatness butyl tape comprises the following steps: S1. Add various raw materials for producing butyl tape into a stirring furnace and stir to form a rubber compound; S2, adding the rubber material obtained in step S1 into an extruder for melt extrusion, and connecting a filter screen to the end of the extruder where the mold is connected, so that impurities in the rubber material can be filtered out when the rubber material is extruded by the extruder, wherein the mesh number of the filter screen is 60 meshes; S3. A water trough is provided in the direction of the discharge end of the extruder, and the water inlet and outlet of the water trough are connected to a cooling tower to realize circulating cooling of the extruded tape. At the same time, the temperature of the water in the water trough is monitored in real time to ensure that the temperature of the water in the water trough is always less than 40°C. In addition, in order to ensure that the temperature inside the tape is fully dissipated, the length of the water trough is at least 2m, so that the temperature of the tape is less than or equal to 40°C when the tape exits the water trough, effectively preventing the deformation of the tape and the decomposition of the internal components. Then, the tape extruded in step S2 is introduced into the water trough, and is rolled up after water cooling to obtain a butyl tape, wherein the specification of the obtained butyl tape is thickness × width: 3×12mm.

[0022] Comparative Example 3 A production process of a high-flatness butyl tape comprises the following steps: S1. Add various raw materials for producing butyl tape into a stirring furnace and stir to form a rubber compound; S2, adding the rubber material obtained in step S1 into an extruder for melt extrusion, and connecting a filter screen to the end of the extruder where the mold is connected, so that impurities in the rubber material can be filtered out when the rubber material is extruded by the extruder, wherein the mesh number of the filter screen is 60 meshes; S3. The tape extruded in step S2 is rolled up to obtain a butyl tape, wherein the specification of the obtained butyl tape is thickness×width: 3×12 mm.

[0023] Performance Testing The butyl tapes obtained in the above examples and comparative examples were tested for product appearance, and the test results are shown in Table 1.

[0024] Table 1 Test results of various butyl tapes sample Surface flatness Deformation Require Smooth surface, no bubbles, no impurities No deformation Example 1 Smooth surface, no bubbles, no impurities No deformation Example 2 Smooth surface, no bubbles, no impurities No deformation Example 3 Smooth surface, no bubbles, no impurities No deformation Comparative Example 1 The surface has tiny bubbles, is uneven, and has no impurities The tape width becomes wider by about 1-2mm and the thickness decreases Comparative Example 2 The surface has tiny bubbles, is uneven, and has no impurities No deformation Comparative Example 3 The surface has bubbles, is uneven, and has no impurities The tape width becomes wider by about 1-2mm and the thickness decreases It can be seen from Table 1 that in the preparation process of Examples 1-3 of the present application, after the rubber material is vacuumed and filtered and the extruded tape is cooled with circulating cooling water, the surface of the butyl tape is smooth, free of bubbles and impurities, and the butyl tape will not be deformed after winding, which shows that the production process of the present application can effectively improve the flatness of the butyl tape and ensure the appearance quality of the butyl tape.

[0025] Compared with Example 3, when circulating cooling water is not used to cool the extruded tape in the production of the butyl tape, the width of the butyl tape after winding in Comparative Example 1 becomes wider, the thickness decreases, and deformation occurs. At the same time, due to the failure to cool in time, microbubbles are generated on the surface of the butyl tape after winding, resulting in an uneven surface of the butyl tape.

[0026] Compared with Example 3, when the rubber material in the stirring furnace is not subjected to vacuum treatment, the surface of the butyl tape obtained in Comparative Example 2 has obvious fine bubbles and is uneven. It can be seen that after the rubber material is subjected to vacuum treatment, the bubbles in the rubber material can be effectively removed, so that the surface of the butyl tape obtained is smooth, and the quality of the butyl tape is guaranteed. Compared with Example 3, when the rubber material in the production of butyl tape is not subjected to vacuum treatment and circulating cooling water treatment, the surface of the butyl tape obtained in Comparative Example 3 has obvious bubbles, which leads to an uneven surface of the butyl tape, and the width of the tape becomes about 1-2 mm wider, the thickness decreases, and obvious deformation occurs.

[0027] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A production process for high-flatness butyl tape, characterized in that: The steps include: S1. Stirring the raw materials for producing butyl tape in a stirring furnace to form a rubber compound, and performing a vacuum treatment on the rubber compound; S2, adding the rubber material obtained in step S1 into an extruder for melt extrusion, and a filter screen is provided at the end of the extruder where the mold is connected; S3, water-cooling the adhesive tape extruded in step S2 and then winding it up.

2. The production process of a high-flatness butyl tape according to claim 1, characterized in that: The vacuum degree during the vacuum treatment is -0.08MPa to -0.1MPa, and the vacuum treatment time is 20-30min.

3. The production process of a high-flatness butyl tape according to claim 1, characterized in that: The mesh number of the filter is 30-60 meshes.

4. The production process of a high-flatness butyl tape according to claim 1, characterized in that: The water cooling means that the extruded adhesive tape enters a water tank and is cooled by circulating cooling water.

5. The production process of a high-flatness butyl tape according to claim 4, characterized in that: The temperature of the water in the water tank is below 40°C.

6. The production process of a high-flatness butyl tape according to claim 4, characterized in that: The temperature of the adhesive tape extruded in step S2 when it leaves the water tank is ≤40°C.