Method and equipment for manufacturing double-sided water-blocking tape

Abstract

The invention discloses a double-sided water-blocking tape manufacturing method and equipment, and relates to the technical field of water-blocking cables, and the manufacturing method comprises the following steps: S1, preparing high-water-absorption gel; the preparation method comprises the following steps: dispersing high-water-absorption gel in water to form a uniform gel solution; the mass ratio of the super absorbent gel to the water is 1: (13-25); s2, conveying aramid fibers to an opener for carding, performing lapping, drafting, spunlace and drying to obtain an aramid water-blocking tape base material, and then pretreating the aramid water-blocking tape base material; s3, dipping the pretreated aramid water-blocking tape base material in the super absorbent gel solution, dipping twice and rolling twice, and drying through a heat treatment channel to obtain a double-sided water-blocking tape; and the equipment for two-dipping and two-rolling is a double-roller padding machine. According to the preparation method provided by the invention, the prepared water-blocking tape has a double-sided expansion material, the expansion rate is high, and the material stability is high.

Description

Technical Field

[0001] The present application relates to the field of water-blocking cable technology, and particularly to a manufacturing method and equipment for a double-sided water-blocking tape. Background Art

[0002] A water-blocking tape is a water-blocking material designed specifically for cables and optical fibers, mainly composed of a strip-shaped base material layer with tensile and temperature-resistant properties and a highly water-absorbent material layer uniformly attached to the base material layer. These two layers can be tightly combined through various methods such as bonding, coating, and impregnation.

[0003] The main function of the water-blocking tape is to prevent water and moisture, ensuring the safe operation of cables and optical fibers. The use of the water-blocking tape can significantly reduce the infiltration of water and moisture into the optical cable, improving the working life of the optical cable. When water enters the cable or optical fiber, the highly water-absorbent material in the water-blocking tape will quickly absorb water and expand, filling the core gap to form a barrier to prevent the longitudinal flow of water in the cable or optical fiber, thus playing a protective role.

[0004] However, currently in China, optical cables mainly consist of two layers of polyester fiber non-woven fabrics bonded with a water-swellable resin SAP in the middle. Since the polyester fiber non-woven fabric is a dense fiber material, bonding the water-swellable resin SAP makes its structure airtight, increasing water impermeability. When water enters the optical cable core, the water-swellable resin SAP is in a relatively isolated state, and the incoming water cannot be contacted instantly, so the effect of rapid expansion and water blocking cannot be achieved. When the water-swellable material starts to expand slowly, a large amount of water will enter the optical cable core, thus having a greater impact on the structure and performance of the optical cable. Summary of the Invention

[0005] To solve the problems existing in the prior art, the present application provides a manufacturing method and equipment for a double-sided water-blocking tape.

[0006] A manufacturing method for a double-sided water-blocking tape provided by the present application adopts the following technical solution:

[0007] A manufacturing method for a double-sided water-blocking tape includes the following steps:

[0008] S1. Prepare a highly water-absorbent gel; disperse the highly water-absorbent gel in water to form a uniform glue solution; the mass ratio of the highly water-absorbent gel to water is 1:13 - 25;

[0009] S2. Feed aramid fibers into an opener for carding, and after web laying, drawing, hydroentangling, and drying, obtain an aramid water-blocking tape base material, and then perform pretreatment on the aramid water-blocking tape base material;

[0010] S3. Immerse the pretreated aramid water-blocking tape base material in the highly water-absorbent gel glue solution, after double dipping and double rolling, and then dry it through a heat treatment channel to obtain a double-sided water-blocking tape.

[0011] Preferably, the superabsorbent gel is prepared from the following raw materials in parts by weight: 6.2 - 12.4 parts of sodium hydroxide, 20 - 35 parts of water, 18 - 35 parts of acrylic acid, 6 - 12 parts of 2 - acrylamido - 2 - methylpropanesulfonic acid, 2.4 - 4.8 parts of sodium lignosulfonate, 2 - 3.5 parts of citric acid, 0.28 - 0.49 parts of initiator, and 0.032 - 0.056 parts of cross - linker.

[0012] Preferably, the initiator is ammonium persulfate.

[0013] Preferably, the cross - linker is N,N' - methylenebisacrylamide.

[0014] Preferably, the preparation method of the superabsorbent gel comprises the following steps:

[0015] Dissolve sodium hydroxide completely in water to obtain a sodium hydroxide solution;

[0016] Measure acrylic acid, drop it into the sodium hydroxide solution in an ice - water bath and stir evenly; then add 2 - acrylamido - 2 - methylpropanesulfonic acid, sodium lignosulfonate, and citric acid respectively. After the solids are completely dissolved, add the initiator and cross - linker, and stir and react at 55 - 65 °C for 15 - 35 min;

[0017] After the reaction is completed, add an ethanol solution and soak for 5 - 8 min, then wash several times with distilled water, and then soak in distilled water for 5 - 8 min to remove unreacted raw materials; freeze the product for 5 - 8 h, then dry it to constant weight at 80 - 90 °C, and break it into a solid with uniform particles to obtain the superabsorbent gel.

[0018] Preferably, the method for pretreating the aramid water - blocking tape substrate comprises the following steps:

[0019] T1. Perform plasma treatment on the aramid water - blocking tape substrate at 80 - 150 W for 3 - 5 min;

[0020] T2. Immerse the plasma - treated aramid water - blocking tape substrate in a solution containing a silane coupling agent, and soak it at 80 - 90 °C for 3 - 4 h. After drying and heat treatment, obtain the pretreated aramid water - blocking tape substrate.

[0021] Preferably, the solution containing the silane coupling agent is composed of the following raw materials in parts by weight: 90 - 95 parts of absolute ethanol, 5 - 10 parts of deionized water, and 2 - 3 parts of silane coupling agent KH - 550.

[0022] Preferably, the medium for plasma treatment is one of air, oxygen, nitrogen, and argon, and the gas flow rate is 60 - 100 cm 3 / min.

[0023] Preferably, the grammage of the aramid water-blocking tape substrate is 30-70 g / m 2 , and the thickness is 0.08-0.15 mm.

[0024] The present application also provides a double-sided water-blocking tape manufacturing device, adopting the following technical solution:

[0025] A device for a double-sided water-blocking tape manufacturing method, and the device for two-dip and two-roll is a double-roll dipping and rolling machine.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. By adopting the above technical solution, the present application provides a superabsorbent hydrogel, which is prepared with sodium lignosulfonate as the bio-based skeleton, acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid as raw materials, ammonium persulfate as the initiator, and N,N'-methylenebisacrylamide as the crosslinking agent; by using natural polymer raw materials with characteristics such as biodegradability, hydrophilicity, rich reserves, renewable, and low price, the prepared superabsorbent hydrogel not only has low cost and is environmentally friendly, but also has a high water absorption and swelling rate. Dispersing the superabsorbent hydrogel in water to form a colloidal solution, impregnating the pretreated aramid non-woven fabric water-blocking tape substrate in the colloidal solution, and performing heat treatment after two-dip and two-roll can uniformly and effectively coat the water absorption and swelling material on both sides of the substrate, avoiding the problem of uneven coating thickness;

[0028] 2. By adopting the above technical solution, the present application modifies aramid through plasma treatment, introduces active points on the surface of aramid fibers with poor reaction activity, and can achieve functional grafting on the surface of aramid through interfacial coupling modification. Silicon elements exist in the form of stable Si-O and Si-C bonds. On the one hand, this chemical bonding can effectively enhance the mechanical properties of the aramid non-woven fabric substrate and enhance its stability; on the other hand, it can effectively improve the interfacial bonding force between it and the superabsorbent hydrogel.

[0029] 3. By adopting the above technical solution, the present application uses a double-roll dipping and rolling machine, and through two-dip and two-roll, uniformly coats the superabsorbent hydrogel on both sides of the aramid non-woven fabric substrate, so that both sides of the substrate have water-blocking performance. Different from the traditional water-blocking tape with a water absorption and swelling resin bonded between two layers of polyester fiber non-woven fabrics, for the double-sided water-blocking tape provided by the present application, when the optical cable core gets water, the superabsorbent hydrogel can quickly absorb water and swell, preventing the water volume from continuing to disperse and spread, effectively improving the performance of the cable core water-blocking material and meeting the requirements of rapid water-blocking. Specific Embodiments

[0030] The following further elaborates on the present application in conjunction with embodiments.

[0031] The chemical reagents used in the preparation examples, embodiment, and comparative examples provided by the present invention are all commercially available products.

[0032] Preparation Example 1

[0033] S1. Dissolve 6.2 g of sodium hydroxide completely in 20 g of water to obtain a sodium hydroxide solution;

[0034] S2. Measure 18 g of acrylic acid, and drop it into the sodium hydroxide solution prepared in S1 in an ice-water bath and stir evenly; then add 6 g of 2-acrylamido-2-methylpropanesulfonic acid, 2.4 g of sodium lignosulfonate, and 2 g of citric acid respectively. After the solids are completely dissolved, add 0.28 g of ammonium persulfate and 0.032 g of N,N'-methylenebisacrylamide, and stir and react at 55 °C for 35 min;

[0035] S3. After the reaction is completed, soak it in a 78% ethanol solution by mass for 5 min, wash it with distilled water 3 times, then soak it in distilled water for 5 min to remove unreacted raw materials; freeze the product in the refrigerator for 5 h, then dry it to constant weight at 80 °C, and break it into a solid with uniform particles to obtain the superabsorbent gel.

[0036] Preparation Example 2

[0037] S1. Dissolve 9.3 g of sodium hydroxide completely in 28 g of water to obtain a sodium hydroxide solution;

[0038] S2. Measure 27 g of acrylic acid, and drop it into the sodium hydroxide solution prepared in S1 in an ice-water bath and stir evenly; then add 9 g of 2-acrylamido-2-methylpropanesulfonic acid, 3.6 g of sodium lignosulfonate, and 2.8 g of citric acid respectively. After the solids are completely dissolved, add 0.39 g of ammonium persulfate and 0.045 g of N,N'-methylenebisacrylamide, and stir and react at 60 °C for 25 min;

[0039] S3. After the reaction is completed, soak it in a 78% ethanol solution by mass for 6.5 min, wash it with distilled water 3 times, then soak it in distilled water for 6.5 min to remove unreacted raw materials; freeze the product in the refrigerator for 6.5 h, then dry it to constant weight at 85 °C, and break it into a solid with uniform particles to obtain the superabsorbent gel.

[0040] Preparation Example 3

[0041] S1. Dissolve 12.4 g of sodium hydroxide completely in 35 g of water to obtain a sodium hydroxide solution;

[0042] S2. Measure 35 g of acrylic acid, and drop it into the sodium hydroxide solution prepared in S1 in an ice-water bath and stir evenly; then add 12 g of 2-acrylamido-2-methylpropanesulfonic acid, 4.8 g of sodium lignosulfonate, and 3.5 g of citric acid respectively. After the solids are completely dissolved, add 0.49 g of ammonium persulfate and 0.056 g of N,N'-methylenebisacrylamide, and stir and react at 65 °C for 15 min;

[0043] S3. After the reaction is completed, soak it in an ethanol solution with a mass fraction of 78% for 8 min, wash it 3 times with distilled water, then soak it in distilled water for 8 min to remove unreacted raw materials; freeze the product in the refrigerator for 8 h, and then dry it to a constant weight at 90 °C, and break it into solids with uniform particles to obtain the superabsorbent gel.

[0044] Example 1

[0045] S1. Prepare the superabsorbent gel according to the preparation method of Preparation Example 1; disperse the superabsorbent gel in water and ultrasonically disperse it at 21 kHz for 20 min to form a uniform colloidal solution; the mass ratio of the superabsorbent gel to water is 1:13;

[0046] S2. Feed the aramid fiber into a carding machine for carding, and then obtain an aramid water-blocking tape substrate with a grammage of 30 g / m 2 , a thickness of 0.08 mm after lapping, drafting, hydroentangling, and drying, and then pretreat the aramid water-blocking tape substrate; the steps for pretreating the aramid water-blocking tape substrate are as follows:

[0047] S21. Perform plasma treatment on the aramid water-blocking tape substrate at 80 W, with the treatment medium being air and the gas flow rate being 60 cm 3 / min for 3 min;

[0048] S22. Mix 90 g of absolute ethanol and 10 g of deionized water, and adjust the pH value of the mixture to 5 with citric acid. Then, stir the mixed solution at a speed of 800 rpm for 5 min. Next, add 2 g of silane coupling agent KH-550 to the solution and continue to stir evenly to obtain a solution containing a silane coupling agent; immerse the plasma-treated aramid water-blocking tape substrate in the solution containing the silane coupling agent, soak it at 80 °C for 3 h, and then obtain the pretreated aramid water-blocking tape substrate after drying and heat treatment;

[0049] S3. Immerse the pretreated aramid water-blocking tape substrate in the superabsorbent gel colloidal solution prepared in S1, use a double-roll padding mangle, pad it twice and roll it twice, and then dry it through a heat treatment channel to obtain a double-sided water-blocking tape; the first impregnation time is 15 min and the liquor pickup is 70%; the second impregnation time is 10 min and the liquor pickup is 70%.

[0050] Example 2

[0051] S1. Prepare a superabsorbent gel according to the preparation method of Preparation Example 1; disperse the superabsorbent gel in water and ultrasonically disperse it for 18 min at 21.5 kHz to form a uniform colloidal solution; the mass ratio of the superabsorbent gel to water is 1:13;

[0052] S2. Feed the aramid fiber into a carding machine for carding, and after web laying, drawing, hydroentangling, and drying, obtain an aramid water-blocking tape substrate with a grammage of 50 g / m 2 , a thickness of 0.12 mm, and then pre-treat the aramid water-blocking tape substrate; the steps for pre-treating the aramid water-blocking tape substrate are as follows:

[0053] S21. Perform plasma treatment on the aramid water-blocking tape substrate at 80 W, with the treatment medium being air and the gas flow rate being 60 cm 3 / min for 3 min;

[0054] S22. Mix 90 g of absolute ethanol and 10 g of deionized water, and adjust the pH value of the mixture to 5 using citric acid. Subsequently, stir the mixed solution at a speed of 800 rpm for 5 min. Then, add 2 g of silane coupling agent KH-550 to the solution and continue to stir evenly to obtain a solution containing a silane coupling agent; immerse the plasma-treated aramid water-blocking tape substrate in the solution containing the silane coupling agent, soak it at 80 °C for 3 h, and then after drying and heat treatment, obtain the pre-treated aramid water-blocking tape substrate;

[0055] S3. Immerse the pre-treated aramid water-blocking tape substrate in the superabsorbent gel colloidal solution prepared in S1, use a double-roll padding mangle, pad it twice and roll it twice, and then dry it through a heat treatment channel to obtain a double-sided water-blocking tape; the first dipping time is 17 min and the pick-up is 65%; the second dipping time is 13 min and the pick-up is 65%.

[0056] Example 3

[0057] S1. Prepare a superabsorbent gel according to the preparation method of Preparation Example 1; disperse the superabsorbent gel in water and ultrasonically disperse it for 15 min at 22 kHz to form a uniform colloidal solution; the mass ratio of the superabsorbent gel to water is 1:13;

[0058] S2. Feed the aramid fiber into a carding machine for carding, and after web laying, drawing, hydroentangling, and drying, obtain an aramid water-blocking tape substrate with a grammage of 70 g / m 2 , a thickness of 0.15 mm, and then pre-treat the aramid water-blocking tape substrate; the steps for pre-treating the aramid water-blocking tape substrate are as follows:

[0059] S21. Perform plasma treatment on the aramid water-blocking tape substrate at 80 W, with the treatment medium being air and the gas flow rate being 60 cm3 Perform plasma treatment at 80W for 3 min with the treatment medium being nitrogen and the gas flow rate being 80 cm

[0060] S22. Mix 90 g of absolute ethanol and 10 g of deionized water, and adjust the pH value of the mixture to 5 using citric acid. Subsequently, stir the mixed solution at a speed of 800 rpm for 5 min. Then, add 2 g of silane coupling agent KH-550 to the solution, continue to stir evenly to obtain a solution containing the silane coupling agent; Immerse the plasma-treated aramid water-blocking tape substrate in the solution containing the silane coupling agent, soak it at 80 °C for 3 h, and then obtain the pretreated aramid water-blocking tape substrate after drying and heat treatment;

[0061] S3. Immerse the pretreated aramid water-blocking tape substrate in the highly absorbent gel adhesive solution prepared in S1, use a double-roll padding mangle, pad twice and roll twice, and then dry it through a heat treatment channel to obtain a double-sided water-blocking tape; The first dipping time is 20 min and the pick-up is 60%; The second dipping time is 15 min and the pick-up is 60%.

[0062] Example 4

[0063] S1. Prepare a highly absorbent gel according to the preparation method of Preparation Example 1; Disperse the highly absorbent gel in water and ultrasonically disperse it for 20 min at 21 kHz to form a uniform adhesive solution; The mass ratio of the highly absorbent gel to water is 1:13;

[0064] S2. Feed the aramid fiber into a carding machine for carding, and then obtain an aramid water-blocking tape substrate with a grammage of 30 g / m 2 and a thickness of 0.08 mm after lapping, drawing, hydroentangling, and drying. Subsequently, perform pretreatment on the aramid water-blocking tape substrate; The steps for pretreating the aramid water-blocking tape substrate are as follows:

[0065] S21. Perform plasma treatment on the aramid water-blocking tape substrate at 110W with the treatment medium being nitrogen and the gas flow rate being 80 cm 3 / min for 4 min;

[0066] S22. Mix 93 g of absolute ethanol and 7 g of deionized water, and adjust the pH value of the mixture to 5.5 using citric acid. Subsequently, stir the mixed solution at a speed of 850 rpm for 8 min. Then, add 2.5 g of silane coupling agent KH-550 to the solution, continue to stir evenly to obtain a solution containing the silane coupling agent; Immerse the plasma-treated aramid water-blocking tape substrate in the solution containing the silane coupling agent, soak it at 85 °C for 3.5 h, and then obtain the pretreated aramid water-blocking tape substrate after drying and heat treatment;

[0067] S3. The pretreated aramid water-blocking tape substrate is immersed in the highly absorbent gel solution prepared by S1, and after two immersions and two rollings using a double-roll dipping and rolling machine, it is dried in a heat treatment channel to obtain a double-sided water-blocking tape; wherein the first immersion time is 15 minutes, and the rolling rate is 70%; the second immersion time is 10 minutes, and the rolling rate is 70%.

[0068] Example 5

[0069] S1. A highly absorbent gel was prepared according to the preparation method of Preparation Example 1; the highly absorbent gel was dispersed in water and ultrasonically dispersed at 21kHz for 20min to form a uniform gel; the mass ratio of the highly absorbent gel to water was 1:13;

[0070] S2. The aramid fiber is transported to the opening machine for combing, and then laid, drawn, spunlaced and dried to obtain a fiber with a gram weight of 30 g / m 2 , an aramid water-blocking tape substrate with a thickness of 0.08 mm, and then pre-treating the aramid water-blocking tape substrate; the steps of pre-treating the aramid water-blocking tape substrate are as follows:

[0071] S21. The aramid water-blocking tape substrate was heated at 150 W, the treated medium was argon gas, and the gas flow rate was 100 cm 3 / min for plasma treatment for 5 min;

[0072] S22. Mix 95g of anhydrous ethanol and 5g of deionized water, and adjust the pH value of the mixture to 6 with citric acid. Then, stir the mixed solution at a speed of 900rpm for 10min, then add 3g of silane coupling agent KH-550 to the solution, and continue to stir evenly to obtain a solution containing a silane coupling agent; immerse the plasma-treated aramid water-blocking tape substrate in the solution containing the silane coupling agent, and soak it at 90°C for 4h, and then obtain a pretreated aramid water-blocking tape substrate after drying and heat treatment;

[0073] S3. The pretreated aramid water-blocking tape substrate is immersed in the highly absorbent gel solution prepared by S1, and after two immersions and two rollings using a double-roll dipping and rolling machine, it is dried in a heat treatment channel to obtain a double-sided water-blocking tape; wherein the first immersion time is 15 minutes, and the rolling rate is 70%; the second immersion time is 10 minutes, and the rolling rate is 70%.

[0074] Example 6

[0075] S1. A highly absorbent gel was prepared according to the preparation method of Preparation Example 1; the highly absorbent gel was dispersed in water and ultrasonically dispersed at 21kHz for 20min to form a uniform gel; the mass ratio of the highly absorbent gel to water was 1:13;

[0076] S2. The aramid fiber is transported to the opening machine for combing, and then laid, drawn, spunlaced and dried to obtain a fiber with a gram weight of 30 g / m 2 , an aramid water-blocking tape substrate with a thickness of 0.08 mm, and then pre-treating the aramid water-blocking tape substrate; the steps of pre-treating the aramid water-blocking tape substrate are as follows:

[0077] The aramid water-blocking tape substrate was heated at 80W, the treated medium was air, and the gas flow rate was 60cm 3 / min for 3 min to obtain a pretreated aramid water-blocking tape substrate;

[0078] S3. The pretreated aramid water-blocking tape substrate is immersed in the highly absorbent gel solution prepared by S1, and after two immersions and two rollings using a double-roll dipping and rolling machine, it is dried in a heat treatment channel to obtain a double-sided water-blocking tape; wherein the first immersion time is 15 minutes, and the rolling rate is 70%; the second immersion time is 10 minutes, and the rolling rate is 70%.

[0079] Example 7

[0080] S1. A highly absorbent gel was prepared according to the preparation method of Preparation Example 1; the highly absorbent gel was dispersed in water and ultrasonically dispersed at 21kHz for 20min to form a uniform gel; the mass ratio of the highly absorbent gel to water was 1:13;

[0081] S2. The aramid fiber is transported to the opening machine for combing, and then laid, drawn, spunlaced and dried to obtain a fiber with a gram weight of 30 g / m 2 , an aramid water-blocking tape substrate with a thickness of 0.08 mm, and then pre-treating the aramid water-blocking tape substrate; the steps of pre-treating the aramid water-blocking tape substrate are as follows:

[0082] 90 g of anhydrous ethanol and 10 g of deionized water were mixed, and the pH value of the mixture was adjusted to 5 with citric acid. Subsequently, the mixed solution was stirred at a speed of 800 rpm for 5 minutes. Then, 2 g of silane coupling agent KH-550 was added to the solution, and the mixture was stirred evenly to obtain a solution containing the silane coupling agent. The aramid water-blocking tape substrate was immersed in the solution containing the silane coupling agent and soaked at 80° C. for 3 hours. After drying and heat treatment, the pretreated aramid water-blocking tape substrate was obtained.

[0083] S3. The pretreated aramid water-blocking tape substrate is immersed in the highly absorbent gel solution prepared by S1, and after two immersions and two rollings using a double-roll dipping and rolling machine, it is dried in a heat treatment channel to obtain a double-sided water-blocking tape; wherein the first immersion time is 15 minutes, and the rolling rate is 70%; the second immersion time is 10 minutes, and the rolling rate is 70%.

[0084] Example 8

[0085] Example 8 is different from Example 1 in that the superabsorbent gel used in Example 8 is prepared by the preparation method of Preparation Example 1, and the mass ratio of the superabsorbent gel to water is 1:19.

[0086] Example 9

[0087] Example 9 is different from Example 1 in that the superabsorbent gel used in Example 9 is prepared by the preparation method of Preparation Example 1, and the mass ratio of the superabsorbent gel to water is 1:25.

[0088] Example 10

[0089] Example 10 is different from Example 1 in that the superabsorbent gel used in Example 10 is prepared by the preparation method of Preparation Example 2, and the mass ratio of the superabsorbent gel to water is 1:13.

[0090] Example 11

[0091] Example 11 is different from Example 1 in that the superabsorbent gel used in Example 11 is prepared by the preparation method of Preparation Example 3, and the mass ratio of the superabsorbent gel to water is 1:13.

[0092] Comparative Example 1

[0093] Comparative Example 1 is different from Example 1 in that the superabsorbent gel used in Comparative Example 1 is prepared by the preparation method of Preparation Example 1, and the mass ratio of the superabsorbent gel to water is 1:10.

[0094] Comparative Example 2

[0095] Comparative Example 2 is different from Example 1 in that the superabsorbent gel used in Comparative Example 2 is prepared by the preparation method of Preparation Example 1, and the mass ratio of the superabsorbent gel to water is 1:28.

[0096] Comparative Example 3

[0097] Comparative Example 3 is different from Example 1 in that the aramid water-blocking tape substrate used in Comparative Example 3 is not pretreated.

[0098] Comparative Example 4

[0099] Comparative Example 4 is different from Example 1 in that the superabsorbent gel is replaced with SAP water-absorbing resin in Comparative Example 4.

[0100] Performance detection test

[0101] I. The expansion height and expansion rate tests of the double-sided water-blocking tapes obtained in Examples 1-11 and Comparative Examples 1-4 are carried out by the method in JB / T 10259-2014 "Water-blocking Tapes for Cables and Optical Fibre Cables". 150 mL of water is selected as the benchmark for the test, and the results are shown in Table 1.

[0102] II. The breaking strength and elongation at break of the double-sided water-blocking tapes obtained in Examples 1-11 and Comparative Examples 1-4 were detected by the method in GB / T 24218.3-2010 "Test Methods for Nonwovens - Part 3: Determination of Tensile Strength and Elongation at Break". The results are shown in Table 1. The specific test results are as follows:

[0103] Table 1 Performance Test Results

[0104]

[0105] It can be seen from the test results in Table 1 that for a preparation method of a double-sided water-blocking tape provided in this application, by compounding a superabsorbent gel with an aramid non-woven fabric substrate whose surface has been pretreated, the obtained double-sided water-blocking tape can not only quickly absorb water and expand rapidly, but also has a relatively low expansion height, which will not cause construction difficulties and will not affect the normal operation of other components after expansion; moreover, the double-sided water-blocking tape has good mechanical properties, high stability, strong binding force with the water-absorbing material, and good durability.

[0106] This specific embodiment is only an interpretation of this application and does not limit this application. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of this application, it is protected by the Patent Law.

Claims

1. A method for manufacturing a double-sided water-blocking tape, characterized in that: The following steps are involved: S1. Preparing a highly absorbent gel; dispersing the highly absorbent gel in water to form a uniform gel; the mass ratio of the highly absorbent gel to water is 1:13-25; S2. The aramid fiber is transported to the opening machine for combing, and the aramid water-blocking tape substrate is obtained after web laying, drafting, spunlacing, and drying, and then the aramid water-blocking tape substrate is pretreated; S3. The pretreated aramid water-blocking tape substrate is immersed in a highly absorbent gel solution, and after two immersions and two rollings, it is dried in a heat treatment channel to obtain a double-sided water-blocking tape; The highly absorbent gel is prepared from the following raw materials in parts by weight: 6.2-12.4 parts of sodium hydroxide, 20-35 parts of water, 18-35 parts of acrylic acid, 6-12 parts of 2-acrylamido-2-methylpropane sulfonic acid, 2.4-4.8 parts of sodium lignin sulfonate, 2-3.5 parts of citric acid, 0.28-0.49 parts of initiator, and 0.032-0.056 parts of cross-linking agent; The method for pretreating the aramid water-blocking tape substrate comprises the following steps: T1. Treat the aramid water-blocking tape substrate with plasma at 80-150W for 3-5min; T2. Immerse the plasma-treated aramid water-blocking tape substrate in a solution containing a silane coupling agent and soak it at 80-90°C for 3-4 hours. After drying and heat treatment, a pretreated aramid water-blocking tape substrate is obtained.

2. A method for manufacturing a double-sided water-blocking tape according to claim 1, characterized in that: The initiator is ammonium persulfate.

3. A method for manufacturing a double-sided water-blocking tape according to claim 1, characterized in that: The cross-linking agent is N,N'-methylenebisacrylamide.

4. A method for manufacturing a double-sided water-blocking tape according to claim 1, characterized in that: The method for preparing the highly absorbent gel comprises the following steps: The sodium hydroxide solution is obtained by completely dissolving the sodium hydroxide in water; Take acrylic acid, add sodium hydroxide solution dropwise in an ice water bath and stir evenly; then add 2-acrylamido-2-methylpropanesulfonic acid, sodium lignin sulfonate and citric acid respectively, add initiator and crosslinker after the solid is completely dissolved, and stir and react at 55-65°C for 15-35 minutes; After the reaction is completed, ethanol solution is added and soaked for 5-8 minutes, then washed with distilled water several times, and then soaked in distilled water for 5-8 minutes to remove unreacted raw materials; the product is frozen for 5-8 hours, dried at 80-90°C to constant weight, and broken into uniform solid particles to obtain a highly absorbent gel.

5. A method for manufacturing a double-sided water-blocking tape according to claim 1, characterized in that: The solution containing the silane coupling agent is composed of the following raw materials in parts by weight: 90-95 parts of anhydrous ethanol, 5-10 parts of deionized water, and 2-3 parts of silane coupling agent KH-550.

6. A method for manufacturing a double-sided water-blocking tape according to claim 1, characterized in that: The plasma treatment medium is one of air, oxygen, nitrogen and argon, and the gas flow rate is 60-100cm 3 / min.

7. A method for manufacturing a double-sided water-blocking tape according to claim 1, characterized in that: The gram weight of the aramid water-blocking tape substrate is 30-70 g / m 2 , thickness is 0.08-0.15mm.

8. The device for manufacturing a double-sided water-blocking tape according to any one of claims 1 to 7, characterized in that: The equipment for the two-dipping and two-rolling is a double-roll dipping and rolling machine.

Images