High-viscosity waterproof foam tape and preparation process thereof

Abstract

The invention relates to a high-viscosity waterproof foam adhesive tape and a preparation process thereof, and relates to the technical field of foam adhesive tapes, the high-viscosity waterproof foam adhesive tape comprises a release layer I, a water-blocking adhesive layer I, a hydrophobic foam layer, a water-blocking adhesive layer II and a release layer II, the water-blocking adhesive layer I and the water-blocking adhesive layer II are obtained by coating a water-blocking adhesive, and the release layer II is coated with a water-blocking adhesive. The water-blocking adhesive is prepared from the following raw materials in parts by mass: 80 to 100 parts of acrylate copolymer, 10 to 15 parts of hydrophobic modifier, 5 to 10 parts of tackifying resin, 3 to 5 parts of cross-linking agent, 5 to 10 parts of filler A, 1 to 2 parts of antioxidant, 0.5 to 1 part of defoaming agent and 0.5 to 1 part of flatting agent. The preparation process comprises the following steps: coating two surfaces of the hydrophobic foam layer with a water-blocking adhesive, and covering the release layer to obtain the high-viscosity waterproof foam adhesive tape. The foam adhesive tape has the effect of improving the adhesion performance of the foam adhesive tape, and the foam adhesive tape has good waterproof performance and tensile performance.

Description

Technical Field

[0001] This application relates to the technical field of foam tapes, and particularly to a high-adhesion waterproof foam tape and its preparation process. Background Art

[0002] As an important adhesive material, foam tapes are widely used in fields such as electronics, automobiles, and construction. However, traditional foam tapes are vulnerable to water vapor erosion in humid environments, resulting in a decrease in adhesion and a shortened service life, making it difficult to meet the growing waterproof requirements. Especially in application scenarios such as outdoor equipment and automotive parts, waterproof performance has become a key indicator for measuring the quality of foam tapes.

[0003] To improve the waterproof performance of existing foam tapes, two main methods are usually adopted: one is to add one or more waterproof membranes to the foam tape, and the other is to improve the adhesive formula to enhance its own waterproof ability. However, the porous structure of the foam substrate is prone to adsorbing water vapor, and ordinary adhesives are prone to hydrolysis and swelling in a long-term immersion or high-humidity environment, resulting in the failure of the adhesive layer and reducing the waterproof performance of the tape, so improvement is needed. Summary of the Invention

[0004] To improve the waterproof performance of foam tapes, this application provides a high-adhesion waterproof foam tape and its preparation process.

[0005] The high-adhesion waterproof foam tape and its preparation process provided by this application adopt the following technical solutions: In the first aspect, a high-adhesion waterproof foam tape provided by this application adopts the following technical solutions: A high-adhesion waterproof foam tape includes a release layer I, a water-blocking adhesive layer I, a hydrophobic foam layer, a water-blocking adhesive layer II, and a release layer II. The water-blocking adhesive layer I and the water-blocking adhesive layer II are obtained by coating with a water-blocking adhesive. The preparation raw materials of the water-blocking adhesive include the following components in parts by mass: 80 - 100 parts of acrylate copolymer 10 - 15 parts of hydrophobic modifier 5 - 10 parts of tackifying resin 3 - 5 parts of crosslinking agent 5 - 10 parts of filler A 1 - 2 parts of antioxidant 0.5 - 1 part of defoaming agent 0.5 - 1 part of leveling agent.

[0006] The water-blocking adhesive is based on an acrylate copolymer. Under the modification of a hydrophobic modifier, it endows the foam tape with excellent waterproof performance, effectively blocking water penetration; the tackifying resin improves the adhesiveness of the adhesive, enabling the foam tape to firmly adhere to various surfaces and meet the high adhesion requirements; the crosslinking agent participates in the formation of a stable crosslinked structure, enhancing the cohesion and durability of the adhesive, thereby improving the adhesion performance and waterproof performance of the foam tape; the filler can enhance the mechanical properties, the antioxidant can prevent the adhesive from oxidizing and aging, extending the service life, and the defoaming agent and leveling agent ensure that the adhesive is uniform and flat during the coating process, avoiding bubbles and flow marks; the components work synergistically to ensure the quality and appearance of the foam tape, achieving a double improvement in waterproof performance and adhesion performance.

[0007] Preferably, the raw materials for preparing the acrylate copolymer include methyl methacrylate, isooctyl acrylate, and styrene.

[0008] Methyl methacrylate endows the copolymer with good hardness and transparency, ensuring the structural strength of the tape; isooctyl acrylate has a long-chain structure, providing excellent flexibility and weather resistance, effectively enhancing the stability of the copolymer in different environments and making it less likely to deteriorate in performance due to factors such as temperature changes and light; the addition of styrene further improves the rigidity and abrasion resistance of the copolymer, optimizing its mechanical properties; these three raw materials cooperate with each other, and the acrylate copolymer formed by copolymerization has a variety of excellent properties. As the key component of the water-blocking adhesive, it improves the comprehensive performance of the adhesive, thereby enhancing the waterproof performance, bonding performance, and durability of the high-adhesion waterproof foam tape.

[0009] Preferably, the raw materials for preparing the hydrophobic modifier include oxidized wax, fluorosilane, and propylene oxide.

[0010] Oxidized wax has hydrophobicity and reactive functional groups; fluorosilane, with its unique molecular structure, combines the low surface energy characteristics of fluorine atoms with the reactive groups of silane, can significantly reduce the surface energy at the molecular level, enhancing the waterproof effect; at the same time, the reactive groups in silane can undergo crosslinking reactions with other molecules, enhancing the intermolecular force; the epoxy group of propylene oxide has high reaction activity and can fully react with oxidized wax and fluorosilane. It not only further improves the hydrophobic structure and strengthens the waterproof effect, but also forms more chemical bonds between molecules, constructing a more compact three-dimensional network structure, effectively improving the tensile properties of the material, so that when the high-adhesion waterproof foam tape is stretched by an external force, it is not easy to deform or damage, maintaining its own structural stability and bonding performance.

[0011] Preferably, the mass ratio of the oxidized wax, fluorosilane, and propylene oxide is 1:0.3:(0.2 - 0.3).

[0012] The hydrophobic modifier prepared according to the above mass ratio can effectively improve the waterproof performance and tensile performance of the foam tape.

[0013] Preferably, the raw materials for preparing the tackifying resin include maleic rosin, terpene resin and dammar resin.

[0014] Maleic rosin contains abundant active groups such as carboxyl groups, which can undergo chemical reactions with other components, enhance the degree of intermolecular crosslinking, build a tight structure, effectively block the intrusion of moisture, and thus improve the waterproof performance; terpene resin has good viscosity and cohesion, which can improve the adhesion of the tackifying resin and enable the foam tape to firmly adhere to the surfaces of various materials; dammar resin has excellent flexibility and stability, and after adding it, it can improve the overall tensile performance. When subjected to external tensile force, the molecular chains can cooperate with each other, resist deformation, and prevent the tape from being easily broken; these three resins cooperate with each other and synergistically enhance the effect, endowing the high-tack waterproof foam tape with excellent comprehensive performance and enabling it to play a stable and reliable role in various application scenarios.

[0015] Preferably, the tackifying resin is prepared by the following steps: Mix and stir maleic rosin, terpene resin and dammar resin, raise the temperature step by step and stir for reaction, naturally cool after the reaction ends, reduce the stirring speed, and discharge after cooling to obtain the tackifying resin.

[0016] The tackifying resin prepared according to the above steps can effectively improve the waterproof performance, adhesion performance and tensile performance of the foam tape.

[0017] Preferably, the crosslinking agent includes trimethylolpropane tris(3-(2-methylaziridinyl)propionate).

[0018] The active groups in trimethylolpropane tris(3-(2-methylaziridinyl)propionate) can undergo crosslinking reactions with acrylate copolymers, hydrophobic modifiers, etc. in the water-blocking adhesive to form a tight and continuous three-dimensional network structure, effectively blocking the penetration path of moisture and enabling the tape to have good waterproof ability; the crosslinking reaction enhances the chemical bonding effect between the adhesive and the surface of the adherend, improves the affinity and adhesion of the adhesive to various materials; the strong and tough network structure constructed by the crosslinking agent greatly enhances the intermolecular interaction force. When the tape is subjected to tensile force, it can evenly disperse the stress, effectively resist deformation, and avoid fracture or debonding caused by stretching, thereby improving the tensile strength and flexibility of the tape.

[0019] Preferably, the hydrophobic foam layer includes 80-100 parts of polyurethane prepolymer, 30-50 parts of hydrophobic copolymer, 3-5 parts of foaming agent, 6-10 parts of isocyanate crosslinking agent, 1-2 parts of antioxidant, 3-5 parts of filler B and 5-10 parts of flame retardant.

[0020] As the main body, polyurethane prepolymer provides good flexibility and mechanical strength; hydrophobic blended polymer has low surface energy, effectively prevents water intrusion, and greatly improves waterproof performance; the foaming agent decomposes when heated to produce gas, so that the foam forms a uniform and fine pore structure, giving it cushioning and shock-absorbing properties, while reducing the density of the foam and reducing the overall weight; the cross-linking agent promotes the formation of a stable three-dimensional network structure between the components, enhances cohesion, improves the tensile strength and durability of the foam, makes it less likely to deform and damage when subjected to force, and also strengthens the bonding stability with the water-blocking adhesive layer; antioxidants delay the aging of the foam layer and extend the service life of the product; fillers enhance mechanical properties and improve hardness and wear resistance; flame retardants play a role in the event of fire, inhibit the spread of flames, give the foam tape flame retardant properties, and ensure safe use; the various components cooperate with each other to improve the waterproof performance, adhesion performance and tensile performance of the high-viscosity waterproof foam tape.

[0021] Preferably, the hydrophobic polymer blend comprises silicone rubber and polytetrafluoroethylene resin.

[0022] Silicone rubber has good flexibility and elasticity, which can give the foam tape good deformation recovery ability, so that it can quickly return to its original shape after being squeezed or stretched by external force, allowing the tape to fit tightly to the adherend under various working conditions. The silicon-oxygen bonds in the molecular structure of silicone rubber give the foam tape chemical stability and weather resistance; polytetrafluoroethylene resin has low surface energy, which can effectively block the penetration of water and form a strong waterproof barrier; after the two are blended, their properties are complementary and synergistic, which not only enhances the waterproof performance of the hydrophobic foam layer, allowing it to function stably in a humid environment, but also optimizes the overall flexibility and durability of the foam tape, and improves the adaptability of the tape in complex application scenarios.

[0023] In a second aspect, the present application provides a preparation process of a high-adhesion waterproof foam tape, which adopts the following technical solution: A preparation process of a high-adhesion waterproof foam tape comprises the following steps: Stirring the acrylic ester copolymer and heating it up, adding a hydrophobic modifier and a tackifying resin, adding a crosslinking agent after stirring, increasing the stirring speed, adding filler A, adding an antioxidant, a defoaming agent and a leveling agent after stirring, slowing down the stirring, cooling, and discharging to obtain a water-blocking adhesive; A water-blocking adhesive is coated on one surface of the hydrophobic foam layer to obtain a water-blocking adhesive layer I, and a release layer I is covered on the surface of the water-blocking adhesive layer I; a water-blocking adhesive is coated on the other surface of the hydrophobic foam layer to obtain a water-blocking adhesive layer II, and a release layer II is covered on the surface of the water-blocking adhesive layer II to obtain a high-adhesion waterproof foam tape.

[0024] The foam tape prepared according to the above steps has good waterproof performance, adhesion performance and tensile performance, can effectively adhere to the adherend, and maintain good working performance for a long time.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. The water-blocking adhesive is based on acrylate copolymer. Under the modification of the hydrophobic modifier, it endows the foam tape with excellent waterproof performance and effectively blocks water penetration; the tackifying resin improves the viscosity of the adhesive, enabling the foam tape to firmly adhere to various surfaces and meet the high adhesion requirements; the cross-linking agent participates in the formation of a stable cross-linked structure, enhancing the cohesion and durability of the adhesive, thereby improving the adhesion performance and waterproof performance of the foam tape; the filler can enhance the mechanical properties, the antioxidant can prevent the oxidation and aging of the adhesive, extend the service life, and the defoamer and leveling agent ensure that the adhesive is uniform and flat during the coating process, avoiding bubbles and flow marks; the components work together synergistically to ensure the quality and appearance of the foam tape, achieving a double improvement in waterproof performance and adhesion performance.

[0026] 2. The oxidized wax has hydrophobicity and reactive active groups; the fluorosilane, with its unique molecular structure, combines the low surface energy characteristics of fluorine atoms with the active groups of silane, can significantly reduce the surface energy at the molecular level and enhance the waterproof effect; at the same time, the active groups in the silane can undergo cross-linking reactions with other molecules, enhancing the intermolecular force; the epoxy group of propylene oxide has high reaction activity and can fully react with the oxidized wax and fluorosilane. It not only further improves the hydrophobic structure and strengthens the waterproof effect, but also forms more chemical bonds between molecules to build a more compact three-dimensional network structure, effectively improving the tensile performance of the material. When the high-adhesion waterproof foam tape is stretched by an external force, it is not easy to deform or damage, and maintains its own structural stability and bonding performance.

[0027] 3. The maleic rosin contains rich active groups such as carboxyl groups, can undergo chemical reactions with other components, enhance the degree of intermolecular cross-linking, build a tight structure, and effectively block the intrusion of moisture, thereby improving the waterproof performance; the terpene resin has good viscosity and cohesion, can improve the adhesion of the tackifying resin, and enable the foam tape to firmly adhere to the surfaces of various materials; the dammar resin has excellent flexibility and stability. After adding, it can improve the overall tensile performance. When subjected to an external force, the molecular chains can cooperate with each other to resist deformation and prevent the tape from being easily broken; these three resins cooperate with each other and synergistically enhance the performance, endowing the high-adhesion waterproof foam tape with excellent comprehensive performance, enabling it to play a stable and reliable role in various application scenarios. Description of the Drawings

[0028] Figure 1 It is a cross-sectional view of a high-adhesion waterproof foam tape in an embodiment of this application.

[0029] Description of the reference numerals: 1, release layer I; 2, water-blocking adhesive layer I; 3, hydrophobic foam layer; 4, water-blocking adhesive layer II; 5, release layer II. Detailed implementation manners

[0030] The embodiments of the present application disclose a high-adhesion waterproof foam tape and its preparation process. Except for special instructions, the raw materials used in the present application can be obtained through commercially available raw materials. The following further details the present application in conjunction with the embodiments: Description of the raw materials: Methyl methacrylate (CAS No.: 80-62-6), isooctyl acrylate (CAS No.: 103-11-7), styrene (CAS No.: 100-42-5), sodium dodecyl sulfate (CAS No.: 151-21-3), the oxidized wax is oxidized paraffin wax, the fluorosilane is heptadecafluorodecyltrimethoxysilane (CAS No.: 83048-65-1), propylene oxide (CAS No.: 75-56-9), maleic rosin (CAS No.: 8050-09-7), terpene resin (CAS No.: 9003-74-1), dammar resin (CAS No.: 9000-16-2), the crosslinking agent is trimethylolpropane tris(3-(2-methylaziridinyl)propionate) (CAS No.: 64265-57-2), filler A is nano calcium carbonate (CAS No.: 471-34-1) with a particle size of 50 nm, filler B is nano silicon dioxide (CAS No.: 7631-86-9) with a particle size of 50 nm, the antioxidant is antioxidant 1010 (CAS No.: 6683-19-8), the defoaming agent model is BYK-066N, the leveling agent model is TEGO Glide 432, the polyurethane prepolymer model is Wanhua Chemical PM-300, silicone rubber raw rubber (CAS No.: 63148-62-9), polytetrafluoroethylene resin (CAS No.: 9002-84-0), the isocyanate crosslinking agent is diphenylmethane diisocyanate (CAS No.: 101-68-8), and the flame retardant is tris(2-chloropropyl) phosphate (CAS No.: 13674-84-5).

[0031] Example 1 Preparation of acrylate copolymer Mix 60 kg of methyl methacrylate, 45 kg of isooctyl acrylate and 12 kg of styrene evenly, add 140 L of deionized water and 1.2 kg of sodium dodecyl sulfate, and pre-emulsify for 30 min under the condition of stirring at a speed of 500 rpm to obtain a pre-emulsion; transfer the pre-emulsion to a reaction kettle, heat up to 80 °C, add an aqueous solution of ammonium persulfate with a concentration of 0.1 mol / L containing 0.6 kg of ammonium persulfate, add it within 1 h, keep the reaction at a speed of 300 rpm for 2 h, cool to below 30 °C after the reaction ends, adjust the pH to 7 with 25% ammonia water, and filter to obtain the acrylate copolymer.

[0032] Preparation of Hydrophobic Modifier Heat 13.33 kg of oxidized wax to 90 °C and stir at a speed of 200 rpm until completely melted to obtain molten oxidized wax; add 4 kg of fluorosilane to the molten oxidized wax and add it within 30 min. After adding, increase the stirring speed to 300 rpm and raise the temperature to 100 °C for reaction for 2 h to obtain a preliminary product; cool the preliminary product to 80 °C, add 2.67 kg of propylene oxide and add it within 1 h, react at a stirring speed of 300 rpm for 2 h, and after the reaction, cool it to below 30 °C and discharge to obtain the hydrophobic modifier.

[0033] Preparation of Tackifying Resin Mix 6 kg of maleic rosin, 8 kg of terpene resin and 6 kg of dammar resin, stir at a speed of 150 rpm for 15 min, heat at a rate of 2.5 °C / min to 120 °C, increase the stirring speed to 250 rpm and stir for 40 min, heat to 170 °C, stir at a speed of 300 rpm for reaction for 2.5 h, and after the reaction, cool naturally. When the temperature drops to 85 °C, reduce the stirring speed to 150 rpm and cool to below 30 °C and discharge to obtain the tackifying resin.

[0034] Preparation of Water-blocking Adhesive Stir 80 kg of acrylate copolymer and heat it to 50 °C at a speed of 150 rpm, add 10 kg of hydrophobic modifier and 5 kg of tackifying resin, stir at a speed of 150 rpm for 30 min, add 3 kg of crosslinking agent, increase the stirring speed to 200 rpm and stir for 20 min, add 5 kg of filler A, stir at a speed of 200 rpm for 25 min, add 1 kg of antioxidant, 0.5 kg of defoamer and 0.5 kg of leveling agent, stir at a speed of 180 rpm for 40 min, and after cooling to below 30 °C, discharge to obtain the water-blocking adhesive.

[0035] Preparation of Hydrophobic Foam Layer Stir 80 kg of polyurethane prepolymer and heat it to 60 °C at a speed of 150 rpm, add 30 kg of hydrophobic blend polymer, and the ratio of silicone rubber raw rubber to polytetrafluoroethylene resin in the hydrophobic blend polymer is 1:1. Stir at a speed of 150 rpm for 30 min, add 6 kg of isocyanate crosslinking agent, 1 kg of antioxidant, 3 kg of filler B and 5 kg of flame retardant in sequence. After adding each raw material, stir at a speed of 150 rpm for 15 min. After adding all, add 3 kg of foaming agent, increase the stirring speed to 200 rpm and continue to stir for 30 min to obtain a mixture; pour the mixture into a mold, carry out foaming and curing reaction at 70 °C for 2 h, wait until it cools to below 30 °C, take it out of the mold and trim to obtain the hydrophobic foam layer.

[0036] Preparation of High - Adhesion Waterproof Foam Tape Coat a water - resistant adhesive on one surface of a hydrophobic foam layer to obtain a water - resistant adhesive layer I, and cover a release layer I on the surface of the water - resistant adhesive layer I; coat a water - resistant adhesive on the other surface of the hydrophobic foam layer to obtain a water - resistant adhesive layer II, and cover a release layer II on the surface of the water - resistant adhesive layer II to obtain a high - adhesion waterproof foam tape.

[0037] Example 2 Preparation of Acrylate Copolymer Mix 60 kg of methyl methacrylate, 45 kg of isooctyl acrylate and 12 kg of styrene evenly, add 140 L of deionized water and 1.2 kg of sodium dodecyl sulfate, and pre - emulsify for 30 min under the condition of stirring at a speed of 500 rpm to obtain a pre - emulsion; transfer the pre - emulsion to a reaction kettle, heat up to 80 °C, add an aqueous solution of ammonium persulfate with a concentration of 0.1 mol / L containing 0.6 kg of ammonium persulfate, add it within 1 h, keep the temperature at 80 °C and react for 2 h at a speed of 300 rpm. After the reaction is completed, cool it below 30 °C, adjust the pH to 7 with 25% ammonia water, and filter to obtain the acrylate copolymer.

[0038] Preparation of Hydrophobic Modifier Heat 12.5 kg of oxidized wax to 90 °C and stir at a speed of 200 rpm until it is completely melted to obtain molten oxidized wax; add 3.75 kg of fluorosilane to the molten oxidized wax, add it within 30 min, after adding, increase the stirring speed to 300 rpm, heat up to 100 °C and react for 2 h to obtain a preliminary product; cool the preliminary product to 80 °C, add 3.75 kg of propylene oxide, add it within 1 h, react at a stirring speed of 300 rpm for 2 h, after the reaction is completed, cool it below 30 °C, and discharge to obtain the hydrophobic modifier.

[0039] Preparation of Tackifying Resin Mix 6 kg of maleic rosin, 8 kg of terpene resin and 6 kg of dammar resin, stir at a speed of 150 rpm for 15 min, heat up at a rate of 2.5 °C / min to 120 °C, increase the stirring speed to 250 rpm and stir for 40 min, heat up to 170 °C, stir and react at a speed of 300 rpm for 2.5 h. After the reaction is completed, cool it naturally. When the temperature drops to 85 °C, reduce the stirring speed to 150 rpm, cool it below 30 °C, and discharge to obtain the tackifying resin.

[0040] Preparation of Water - Resistant Adhesive Heat 100 kg of acrylate copolymer to 50 °C with stirring at 150 rpm, add 15 kg of hydrophobic modifier and 10 kg of tackifying resin, stir at 150 rpm for 30 minutes, add 5 kg of crosslinking agent, increase the stirring speed to 200 rpm and stir for 20 min, add 10 kg of filler A, stir at 200 rpm for 25 min, add 2 kg of antioxidant, 1 kg of defoamer and 1 kg of leveling agent, stir at 180 rpm for 40 min, cool to below 30 °C, and then discharge to obtain a water-blocking adhesive.

[0041] Prepare a hydrophobic foam layer Heat 100 kg of polyurethane prepolymer to 60 °C with stirring at 150 rpm, add 50 kg of hydrophobic blend polymer, in which the ratio of silicone rubber raw rubber to polytetrafluoroethylene resin is 1:1, stir at 150 rpm for 30 min, sequentially add 10 kg of isocyanate crosslinking agent, 2 kg of antioxidant, 5 kg of filler B and 10 kg of flame retardant, stir at 150 rpm for 15 min after each addition of a raw material. After all additions are completed, add 5 kg of foaming agent, increase the stirring speed to 200 rpm and continue stirring for 30 min to obtain a mixture; pour the mixture into a mold, carry out foaming and curing reactions at 70 °C for 2 h, wait until it cools to below 30 °C, take it out of the mold, and perform trimming to obtain a hydrophobic foam layer.

[0042] Prepare a high-tack waterproof foam tape Coat the water-blocking adhesive on one surface of the hydrophobic foam layer to obtain a water-blocking adhesive layer I, and cover a release layer I on the surface of the water-blocking adhesive layer I; coat the water-blocking adhesive on the other surface of the hydrophobic foam layer to obtain a water-blocking adhesive layer II, and cover a release layer II on the surface of the water-blocking adhesive layer II to obtain a high-tack waterproof foam tape.

[0043] Example 3 Prepare acrylate copolymer Mix 60 kg of methyl methacrylate, 45 kg of 2-ethylhexyl acrylate and 12 kg of styrene evenly, add 140 L of deionized water and 1.2 kg of sodium dodecyl sulfate, pre-emulsify for 30 min under the condition of stirring at 500 rpm to obtain a pre-emulsion; transfer the pre-emulsion to a reaction kettle, heat to 80 °C, add an aqueous solution of ammonium persulfate with a concentration of 0.1 mol / L containing 0.6 kg of ammonium persulfate, add it all within 1 h, keep the reaction at 300 rpm for 2 h, after the reaction ends, cool to below 30 °C, adjust the pH to 7 with 25% ammonia water, and filter to obtain acrylate copolymer.

[0044] Prepare hydrophobic modifier Heat 12.9 kg of oxidized wax to 90 °C and stir at a speed of 200 rpm until it is completely melted to obtain molten oxidized wax; add 3.87 kg of fluorosilane to the molten oxidized wax, add it completely within 30 min, and after adding, increase the stirring speed to 300 rpm, raise the temperature to 100 °C and react for 2 h to obtain a preliminary product; cool the preliminary product to 80 °C, add 3.23 kg of propylene oxide, add it completely within 1 h, react at a stirring speed of 300 rpm for 2 h, and after the reaction, cool it to below 30 °C and discharge to obtain a hydrophobic modifier.

[0045] Prepare tackifying resin Mix 6 kg of maleic rosin, 8 kg of terpene resin and 6 kg of dammar resin, stir at a speed of 150 rpm for 15 min, heat up to 120 °C at a rate of 2.5 °C / min, increase the stirring speed to 250 rpm and stir for 40 min, heat up to 170 °C, stir and react at a speed of 300 rpm for 2.5 h, and after the reaction, cool naturally. When the temperature drops to 85 °C, reduce the stirring speed to 150 rpm and cool to below 30 °C and discharge to obtain tackifying resin.

[0046] Prepare water-blocking adhesive Stir 90 kg of acrylate copolymer and heat it up to 50 °C at a speed of 150 rpm, add 12.5 kg of hydrophobic modifier and 7.5 kg of tackifying resin, stir at a speed of 150 rpm for 30 minutes, add 4 kg of crosslinking agent, increase the stirring speed to 200 rpm and stir for 20 min, add 7.5 kg of filler A, stir at a speed of 200 rpm for 25 min, add 1.5 kg of antioxidant, 0.75 kg of defoaming agent and 0.75 kg of leveling agent, stir at a speed of 180 rpm for 40 min, and after cooling to below 30 °C, discharge to obtain water-blocking adhesive.

[0047] Prepare hydrophobic foam layer Stir 90 kg of polyurethane prepolymer and heat it up to 60 °C at a speed of 150 rpm, add 40 kg of hydrophobic blend polymer, and the ratio of silicone rubber raw rubber to polytetrafluoroethylene resin in the hydrophobic blend polymer is 1:1, stir at a speed of 150 rpm for 30 min, add 8 kg of isocyanate crosslinking agent, 1.5 kg of antioxidant, 4 kg of filler B and 7.5 kg of flame retardant in sequence, and stir at a speed of 150 rpm for 15 min after adding each raw material. After adding all, add 4 kg of foaming agent, increase the stirring speed to 200 rpm and continue to stir for 30 min to obtain a mixture; pour the mixture into a mold, carry out foaming and curing reaction at 70 °C for 2 h, wait until it cools to below 30 °C, take it out of the mold and trim it to obtain a hydrophobic foam layer.

[0048] Prepare high-adhesion waterproof foam tape Apply a water-blocking adhesive to one surface of the hydrophobic foam layer to obtain a water-blocking adhesive layer I, and cover a release layer I on the surface of the water-blocking adhesive layer I; apply a water-blocking adhesive to the other surface of the hydrophobic foam layer to obtain a water-blocking adhesive layer II, and cover a release layer II on the surface of the water-blocking adhesive layer II to obtain a high-adhesion waterproof foam tape.

[0049] Example 4 Example 4 is based on Example 3. The difference between Example 4 and Example 3 is only that the amount of oxidized wax used in Example 4 is 14.29 kg, the amount of fluorosilane used is 4.28 kg, and the amount of propylene oxide used is 1.43 kg.

[0050] Example 5 Example 5 is based on Example 3. The difference between Example 5 and Example 3 is only that the amount of oxidized wax used in Example 5 is 11.76 kg, the amount of fluorosilane used is 3.53 kg, and the amount of propylene oxide used is 4.71 kg.

[0051] Example 6 Example 6 is based on Example 3. The difference between Example 6 and Example 3 is only that fluorosilane is not added in the preparation of the hydrophobic modifier in Example 6.

[0052] Example 7 Example 7 is based on Example 3. The difference between Example 7 and Example 3 is only that maleic rosin is not added in the preparation of the tackifying resin in Example 7.

[0053] Example 8 Example 8 is based on Example 3. The difference between Example 8 and Example 3 is only that damar resin is not added in the preparation of the tackifying resin in Example 8.

[0054] Example 9 Example 9 is based on Example 3. The difference between Example 9 and Example 3 is only that silicone rubber raw rubber is not added in the preparation of the hydrophobic foam layer in Example 9.

[0055] Example 10 Example 10 is based on Example 3. The difference between Example 10 and Example 3 is only that polytetrafluoroethylene resin is not added in the preparation of the hydrophobic foam layer in Example 10.

[0056] Comparative Example 1 Comparative Example 1 is based on Example 3. The difference between Comparative Example 1 and Example 3 is only that the hydrophobic modifier is not added in Comparative Example 1.

[0057] Comparative Example 2 Comparative Example 2 is based on Example 3. The only difference between Comparative Example 2 and Example 3 is that Comparative Example 2 replaces the tackifying resin with terpene resin.

[0058] Performance Detection Test (1) Select "GB / T 2792-2014 Test Method for Peel Strength of Adhesive Tape" as the standard, and use a desktop tensile testing machine to test the 180° peel force of the polyurethane foam. Prepare three samples for each specimen, and take the average value after measurement. The results are recorded in Table 1.

[0059] (2) Select "GB / T 15331-2020 Test Method for Water Vapor Transmission Rate of Pressure-Sensitive Adhesive Tape" as the standard, and test the water vapor transmission rate perpendicular to the direction of the foam tape. Prepare three samples for each specimen, and take the average value after measurement. The results are recorded in Table 1.

[0060] (3) Select "GB / T 30776-2014 Test Method for Tensile Strength and Elongation at Break of Adhesive Tape" as the standard, and test the tensile strength and elongation at break of the specimen. Prepare three samples for each specimen, and take the average value after measurement. The results are recorded in Table 1.

[0061] Table 1 Detection Results of Adhesion Performance, Waterproof Performance and Tensile Performance of High-Adhesion Waterproof Foam Tape As can be seen from Table 1, the peel force of Examples 1-3 is greater than 25.2 N / 25 mm, the water vapor transmission rate is less than 3.3 g / (m 2 ·24 h), the tensile strength is greater than 2.83 MPa, and the elongation at break is greater than 325%. Thus, it can be seen that the foam tape prepared in this application has good adhesion performance, waterproof performance and tensile performance.

[0062] As can be seen from Table 1, the only differences between Examples 4, 5, 6 and Example 3 are as follows: in Example 4, the mass ratio of oxidized wax, fluorosilane and propylene oxide is 1:0.3:0.1; in Example 5, the mass ratio of oxidized wax, fluorosilane and propylene oxide is 1:0.3:0.4; in Example 6, fluorosilane is not added when preparing the hydrophobic modifier. Compared with Example 3, the performance of Examples 4, 5, 6 has decreased; this is because the optimal ratio is destroyed or the synthesis components of the hydrophobic modifier are reduced, the intermolecular cooperative force decreases, and the molecular structure is affected, resulting in a decrease in adhesion performance, waterproof performance and tensile performance.

[0063] As can be seen from Table 1, the only difference between Examples 7 and 8 and Example 3 is that maleic rosin is not added when preparing the tackifying resin in Example 7, and dammar resin is not added when preparing the tackifying resin in Example 8. Compared with Example 3, the performance of Examples 7 and 8 is reduced. This is because the failure to add maleic rosin or dammar resin will destroy the synergistic effect between the components, thereby reducing the performance of the tackifying resin, reducing the improvement effect on the water-blocking adhesive, and reducing the performance of the foam tape.

[0064] As can be seen from Table 1, the only difference between Examples 9 and 10 and Example 3 is that in Example 9, no silicone rubber is added when preparing the hydrophobic foam layer, and in Example 10, no polytetrafluoroethylene resin is added when preparing the hydrophobic foam layer. Compared with Example 3, the performance of Examples 9 and 10 is reduced. This is because not adding silicone rubber or polytetrafluoroethylene resin will affect the hydrophobic properties and molecular structure of the hydrophobic foam layer, and the performance of the foam layer is reduced, thereby affecting the waterproof performance and tensile properties of the foam tape.

[0065] As can be seen from Table 1, the only difference between Comparative Example 1 and Example 3 is that no hydrophobic modifier is added in Comparative Example 1, and the performance of Comparative Example 1 is reduced compared with Example 3; this is because the lack of introduction of the hydrophobic modifier increases the surface energy and weakens the intermolecular force, thereby reducing the waterproof performance and the tensile performance.

[0066] As can be seen from Table 1, the only difference between Comparative Example 2 and Example 3 is that the tackifying resin is replaced with a terpene resin in Comparative Example 2, and the performance of Comparative Example 2 is reduced compared with Example 3; this is because without adding maleic rosin and dammar resin, the adhesion performance of the tackifying resin deteriorates and the degree of crosslinking decreases, thereby affecting the performance of the water-blocking adhesive, and the waterproof performance, adhesion performance and tensile performance of the foam are all reduced.

[0067] This specific embodiment is only an explanation of the present application, and it is not a limitation of the present application. Through the above description, relevant staff can make various changes and modifications without deviating from the technical idea of ​​the present application. The technical scope of the present application is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A high-adhesion waterproof foam tape, characterized in that: It includes a release layer I, a water-blocking adhesive layer I, a hydrophobic foam layer, a water-blocking adhesive layer II and a release layer II. The water-blocking adhesive layer I and the water-blocking adhesive layer II are obtained by coating with a water-blocking adhesive. The raw materials for preparing the water-blocking adhesive include the following components in parts by mass: Acrylate copolymer 80-100 parts 10-15 parts of hydrophobic modifier 5-10 parts of tackifying resin 3-5 parts of crosslinking agent Filler A 5-10 parts 1-2 servings of antioxidants Defoaming agent 0.5-1 part 0.5-1 part of leveling agent.

2. The high-adhesion waterproof foam tape according to claim 1, characterized in that: The raw materials for preparing the acrylic ester copolymer include methyl methacrylate, isooctyl acrylate and styrene.

3. The high-adhesion waterproof foam tape according to claim 1, characterized in that: The raw materials for preparing the hydrophobic modifier include oxidized wax, fluorine-containing silane and propylene oxide.

4. The high-adhesion waterproof foam tape according to claim 3, characterized in that: The mass ratio of the oxidized wax, fluorinated silane and propylene oxide is 1:0.3:(0.2-0.3).

5. The high-adhesion waterproof foam tape according to claim 1, characterized in that: The raw materials for preparing the tackifying resin include maleic rosin, terpene resin and dammar resin.

6. The high-adhesion waterproof foam tape according to claim 5, characterized in that: The tackifying resin is prepared by the following steps: The maleic rosin, terpene resin and dammar resin are mixed and stirred, and the temperature is raised step by step for stirring reaction. After the reaction is completed, the mixture is naturally cooled, and the stirring speed is reduced. After cooling, the mixture is discharged to obtain a tackifying resin.

7. The high-adhesion waterproof foam tape according to claim 1, characterized in that: The crosslinking agent includes trimethylolpropane tris(3-(2-methylaziridinyl)propionate).

8. The high-adhesion waterproof foam tape according to claim 1, characterized in that: The hydrophobic foam layer comprises 80-100 parts of polyurethane prepolymer, 30-50 parts of hydrophobic blended polymer, 3-5 parts of foaming agent, 6-10 parts of isocyanate crosslinking agent, 1-2 parts of antioxidant, 3-5 parts of filler B and 5-10 parts of flame retardant.

9. The high-adhesion waterproof foam tape according to claim 8, characterized in that: The hydrophobic blended polymer includes silicone rubber and polytetrafluoroethylene resin.

10. A process for preparing the high-adhesion waterproof foam tape as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: Stirring the acrylic ester copolymer and heating it up, adding a hydrophobic modifier and a tackifying resin, adding a crosslinking agent after stirring, increasing the stirring speed, adding filler A, adding an antioxidant, a defoaming agent and a leveling agent after stirring, slowing down the stirring, cooling, and discharging to obtain a water-blocking adhesive; A water-blocking adhesive is coated on one surface of the hydrophobic foam layer to obtain a water-blocking adhesive layer I, and a release layer I is covered on the surface of the water-blocking adhesive layer I; a water-blocking adhesive is coated on the other surface of the hydrophobic foam layer to obtain a water-blocking adhesive layer II, and a release layer II is covered on the surface of the water-blocking adhesive layer II to obtain a high-adhesion waterproof foam tape.

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