Precise cold stripping adhesive tape for manufacturing electronic equipment

Abstract

The invention discloses a precise cold stripping adhesive tape for manufacturing electronic equipment, and belongs to the technical field of adhesive tapes, the adhesive tape is composed of a PET film, a hot melt adhesive and a release film, and has a cold stripping function, that is, the adhesive tape is not sticky at normal temperature, generates viscosity after being heated and loses viscosity after being cooled, elements are convenient to fix and take out, and pollution and damage are avoided. The preparation of the hot melt adhesive comprises preparation of a pre-mixture and a polymerization reaction. Compared with the prior art, the adhesive tape disclosed by the invention shows excellent holding power performance under the conditions of 85 DEG C and 85% humidity, is extremely low in residual adhesive rate, is suitable for high-precision requirements in electronic equipment manufacturing, and meets the requirements of high-end electronic equipment manufacturing on high precision, high reliability and high durability.

Description

Technical Field

[0001] The present invention relates to the technical field of adhesive tapes, in particular to a precision cold-peeling adhesive tape for manufacturing electronic equipment. Background Art

[0002] In the field of electronic equipment manufacturing, precision cold-peel tape is a key auxiliary material, widely used in the securing, protection, and cutting of electronic components. This tape must possess unique cold-peel properties: non-sticky at room temperature, becoming sticky upon heating, and losing its stickiness upon cooling. This facilitates component securing and removal while preventing contamination or damage. However, existing cold-peel tapes still have some shortcomings in practical applications, particularly in terms of adhesive residue and resistance to high-temperature, high-humidity aging.

[0003] Chinese invention patent CN113861877A discloses a PET-based cutting tape with a cold-peeling function and its preparation method. The tape is composed of a PET film, a hot-melt adhesive, and a release film. The main components of the hot-melt adhesive include acrylic acid, butyl acrylate, methyl acrylate, dioctyl adipate, an initiator, ethyl acetate, and toluene. The tape of this invention has the characteristics of being non-sticky when cold and sticky when hot. It becomes sticky when heated to above 55°C and loses its stickiness after cooling to room temperature. It can fix the cut object without sticking or contaminating, and can be reused many times. However, the tape of this invention still has room for improvement in terms of aging performance and residual adhesive rate in high-temperature and high-humidity environments. Especially under the requirements of high precision and high reliability in electronic equipment manufacturing, the limitations of existing technologies are gradually becoming apparent.

[0004] Furthermore, existing cold-peel tapes also suffer from deficiencies in flexibility, adhesion, and performance retention after repeated use. These issues limit their widespread application in high-end electronic device manufacturing, particularly in applications requiring high precision, high reliability, and high durability. Therefore, developing a precision cold-peel tape with lower adhesive residue, superior high-temperature and high-humidity aging resistance, and improved flexibility and adhesion has become a pressing technical challenge in this field. Summary of the Invention

[0005] In order to solve the deficiencies in the prior art, the present invention aims to provide a precision cold peeling tape for use in electronic equipment manufacturing.

[0006] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions: A method for preparing a precision cold peeling tape for electronic equipment manufacturing is as follows: First, the PET film is installed on the unloading shaft of the automatic tape coating machine, and the film is conveyed to the coating wheel through the transmission device, wherein the coating wheel is evenly coated with hot melt adhesive with a thickness of 50~80μm. Then, the coated PET film is sequentially passed through a 5-zone drying oven for drying, and finally conveyed to the winding wheel and laminated with the release film to complete the preparation of the tape.

[0007] During the drying process, a 5-zone oven was used for drying, and the temperature settings of each zone of the oven were as follows: The temperature of zone 1 is controlled at 70~90℃; the temperature of zone 2 is controlled at 90~100℃; the temperature of zone 3 is controlled at 90~110℃; the temperature of zone 4 is controlled at 100~120℃; the temperature of zone 5 is controlled at 120~130℃.

[0008] The thickness of the PET film is 0.025-0.5 mm.

[0009] The release film has a thickness of 0.025-0.2 mm.

[0010] The preparation method of the hot melt adhesive comprises the following steps, in parts by weight: Step 1, adding 8 to 12 parts of acrylic acid, 70 to 90 parts of 2-ethylhexyl acrylate, 110 to 130 parts of isooctyl acrylate, 5 to 10 parts of a modifying functional agent and 400 to 500 parts of dioctyl phthalate to 500 to 700 parts of ethyl acetate, mixing, and fully stirring at 40 to 60° C. to prepare a premix; dissolving 3 to 5 parts of benzoyl peroxide in 1400 to 1550 parts of ethyl acetate, stirring evenly, to prepare an initiator solution; Step 2: Place 400-600 parts of the initiator solution prepared in step 1 into a reactor, stir at 200-400 rpm, heat to 80-90°C and maintain for 10-30 minutes; add 300-500 parts of the premix prepared in step 1 to the reactor, raise the temperature in the reactor to 85-95°C after 0.4-0.6 hours, react violently, and when the temperature drops back to 80-90°C, the initial reaction is completed; use a burette to continuously drop 800-1000 parts of the premix prepared in step 1 into the reactor, the titration time is 2-4 hours, and the temperature in the reactor is maintained at 80-90°C. At the same time, the remaining initiator solution prepared in step 1 is simultaneously dropped into the reactor, the titration time is 1-3 hours, and after the titration is completed, maintain a constant temperature of 80-90°C, adjust the speed to 200-400 rpm, treat for 1-3 hours, then cool the temperature in the reactor to 20-40°C, filter the product, and obtain a hot melt adhesive.

[0011] The filtered product is a product filtered through a 100-300 mesh filter.

[0012] The preparation method of the modified functional agent is as follows, in parts by weight: S1. Mix 15-20 parts of rosin with 1-2 parts of a nickel-based catalyst, stir for 20-40 minutes, add 40-60 parts of solvent oil and 4-6 parts of water, seal the reaction system, and connect a hydrogenation device. Pass 3-6 MPa of hydrogen at 140-160° C. and stir for 2-6 hours. After the reaction is completed, cool to room temperature, let stand until stratification, and take the upper oil phase to obtain an oil phase; S2, 20-30 parts of andrographolide, 0.5-2 parts of sodium lauryl sulfonate, and 40-60 parts of 1-3 wt% sodium hydroxide aqueous solution are mixed, stirred at 50-70 ° C for 20-40 minutes, then heated to 70-90 ° C, 0.1-0.3 parts of initiator are added, stirred for 30-50 minutes, and then 8-12 parts of the oil phase obtained in step S1 are added dropwise for 10-30 minutes, heated to 80-100 ° C, and treated for 1-2 hours. Finally, the temperature is lowered to 40-55 ° C, and 8-12 parts of 0.05-0.2 mol / L triethanolamine aqueous solution are added to obtain a modified functional agent.

[0013] The initiator is at least one of azobisisobutyronitrile, dicumyl peroxide, and dibenzoyl peroxide.

[0014] In the present invention, the functions of each substance are as follows: PET film serves as the backing material of the tape, providing mechanical support and structural stability.

[0015] Hot melt adhesive serves as the adhesive layer of the tape and provides a cold peel function, that is, it is non-sticky at room temperature, becomes sticky after heating, and loses its stickiness after cooling, making it easier to fix and remove components.

[0016] Acrylic acid and its esters (such as 2-ethylhexyl acrylate and isooctyl acrylate) provide good adhesion and flexibility, while improving the fluidity and processing properties of hot melt adhesives.

[0017] Dioctyl phthalate (DOP) acts as a plasticizer to lower the glass transition temperature of hot melt adhesives and improve flexibility and processing properties.

[0018] Benzoyl peroxide acts as a free radical initiator to initiate the polymerization reaction and ensure the crosslinking and curing of the hot melt adhesive.

[0019] Ethyl acetate is used as a solvent to dissolve and disperse the components of the hot melt adhesive, making it easier to mix and apply.

[0020] The modified functional agent improves the performance of hot melt adhesive, further reduces the residual adhesive rate, and improves the high temperature and high humidity aging resistance.

[0021] Rosin provides abundant carboxyl and double bond functional groups, which react with nickel-based catalysts to generate a highly stable oil phase, enhancing the flexibility and adhesion of the hot melt adhesive.

[0022] Andrographolide has a unique chemical structure (such as hydroxyl groups, double bonds and ester groups), which can form stable chemical bonds with other ingredients in hot melt adhesives, further improving cohesive strength and aging resistance.

[0023] Sodium dodecyl sulfate acts as a surfactant to improve the dispersibility and wettability of hot melt adhesives and enhance their bonding properties with the substrate.

[0024] The sodium hydroxide aqueous solution adjusts the pH value of the reaction system and promotes the reaction.

[0025] Triethanolamine aqueous solution is used to adjust the final pH value of the hot melt adhesive to ensure its stability and adhesion performance during use.

[0026] Nickel-based catalysts act as catalysts in the hydrogenation reaction, promoting the hydrogenation reaction of rosin to generate a highly stable oil phase.

[0027] The release film covers the surface of the hot melt adhesive to prevent the tape from sticking during storage and transportation, and to facilitate peeling during use.

[0028] Solvent oil is used as a reaction medium to dissolve and disperse the reactants to facilitate the reaction.

[0029] Initiators (such as azobisisobutyronitrile and diisopropylbenzene peroxide) provide free radicals in the polymerization reaction of hot melt adhesives, promote the polymerization reaction of monomers, and ensure the crosslinking and curing of hot melt adhesives.

[0030] Hydrogen is used in the hydrogenation reaction to reduce the double bonds in rosin to form a stable oil phase.

[0031] Through the synergistic effect of these substances, the precision cold peeling tape of the present invention shows significant superiority in adhesive residue rate, high temperature and high humidity aging resistance and peeling performance, and is particularly suitable for high-precision applications in electronic equipment manufacturing.

[0032] Compared with the existing technology, it has the following beneficial effects: 1) The present invention significantly reduces the residual adhesive rate of precision cold-peel tape by optimizing the hot-melt adhesive formula and the preparation process of the modified functional agent. Almost no colloid remains after peeling, significantly improving the cleanliness and yield rate in electronic equipment manufacturing.

[0033] 2) The precision cold-peel adhesive tape of this invention exhibits excellent aging resistance in high-temperature, high-humidity environments. Under test conditions of 85°C and 85% humidity, the tape maintained excellent adhesion and stability, making it suitable for the stringent high-temperature, high-humidity requirements of electronic device manufacturing.

[0034] 3) By introducing a functional modifying agent and optimizing the hot-melt adhesive preparation process, the present invention significantly improves the tape's flexibility and peeling properties, enhancing its cohesive strength and adhesion. This improvement not only enhances the tape's performance but also ensures that it retains good peeling properties even after repeated use, further increasing production efficiency and economic benefits. DETAILED DESCRIPTION

[0035] Main sources of substances: Solvent oil, brand: D60, kinematic viscosity (40℃) mm / s: 1.189, aromatic content (m / m) / %: 0.0007, Shanghai Senxu Chemical Technology Co., Ltd.

[0036] Rosin, brand: 2115, brand: Kraton, USA.

[0037] Nickel-based catalyst, product number: 80004, brand: CLARIANT / Clariant.

[0038] Andrographolide, commercial product, CAS number: 5508-58-7.

[0039] Terpene resin, model: T80, average molecular weight: 650-2600, Hunan Jitian New Technology Co., Ltd.

[0040] Phenolic resin, product number: BF03, appearance: light (dark) yellow, softening point (ring and ball method): 95-110℃, hydroxymethyl content: 8-11%, Shenzhen Jitian Chemical Co., Ltd.

[0041] Epoxy resin, model: YN 1828, viscosity: 11000-15000 (mPas), Shanghai Kaiyin Chemical Co., Ltd.

[0042] PET film, thickness: 0.1mm, Dongguan Lingmei New Materials Co., Ltd.

[0043] Release film, thickness: 0.05mm, material: PET film, Kunshan Caiyi Paper and Plastic Products Co., Ltd.

[0044] The remaining raw materials in the examples and comparative examples of the present invention are all commercially available products.

[0045] The design concept of this invention significantly improves the performance of precision cold-peel adhesive tape by optimizing the hot-melt adhesive formulation and the preparation process of the functional modifying agent. Specifically, rosin and andrographolide are used as core modifying ingredients. Their rich functional groups (such as hydroxyl groups, double bonds, and ester groups) react with a nickel-based catalyst to produce a highly stable oil phase. This, in turn, interacts with andrographolide to enhance the tape's adhesion and peel properties. Furthermore, by precisely controlling the hot-melt adhesive polymerization conditions and oven drying process, the tape's flexibility and aging resistance are further optimized. This results in a lower adhesive residue rate and superior adhesion retention in high-temperature and high-humidity environments, meeting the high-performance requirements for precision tapes in electronic device manufacturing.

[0046] Example 1 A method for preparing a precision cold peeling tape for electronic equipment manufacturing is as follows: First, the PET film is installed on the discharge shaft of the automatic tape coating machine, and the PET film is conveyed to the coating wheel through the transmission device, wherein the coating wheel is evenly coated with hot melt adhesive, and the thickness of the coated hot melt adhesive is 60 μm. Then, the coated PET film is sequentially passed through a 5-zone oven for drying, and finally conveyed to the winding wheel and bonded with the release film to complete the preparation of the tape.

[0047] During the drying process, the temperature of each zone of the oven is set as follows: The temperature of zone 1 is controlled at 80℃; the temperature of zone 2 is controlled at 95℃; the temperature of zone 3 is controlled at 100℃; the temperature of zone 4 is controlled at 110℃; the temperature of zone 5 is controlled at 125℃.

[0048] The preparation method of the hot melt adhesive comprises the following steps: Step 1: 10 g of acrylic acid, 80 g of 2-ethylhexyl acrylate, 120 g of isooctyl acrylate, 8 g of a modifying functional agent, and 450 g of dioctyl phthalate were added to 600 g of ethyl acetate, mixed, and stirred at 50° C. to prepare a premix; 4 g of benzoyl peroxide was dissolved in 1496 g of ethyl acetate and stirred to prepare an initiator solution; Step 2: Place 500 g of the initiator solution prepared in step 1 into the reactor, stir at 300 rpm, heat to 85 ° C and maintain for 20 minutes; add 400 g of the premix prepared in step 1 to the reactor, raise the temperature in the reactor to 90 ° C after 0.5 hours, react violently, and when the temperature drops to 85 ° C, the initial reaction is completed; use a burette to continuously drop 868 g of the premix prepared in step 1 into the reactor, the titration time is 3 hours, the temperature in the reactor is maintained at 85 ° C, and the remaining initiator solution prepared in step 1 is simultaneously dropped into the reactor, the titration time is 2 hours, and after the titration is completed, maintain a constant temperature of 85 ° C, adjust the speed to 300 rpm, treat for 2 hours, then cool the temperature in the reactor to 30 ° C, filter the product through a 200 mesh filter to obtain a hot melt adhesive.

[0049] The preparation method of the modified functional agent is as follows: S1, 18g of rosin was mixed with 1.5g of nickel-based catalyst, stirred for 30 minutes, 50g of solvent oil and 5g of water were added, the reaction system was sealed, and a hydrogenation device was connected. 4MPa of hydrogen was introduced at 150°C and stirred for 4 hours. After the reaction was completed, the mixture was cooled to room temperature and allowed to stand until stratification, and the upper oil phase was taken to obtain an oil phase; S2, 25g andrographolide, 1g sodium lauryl sulfate, 50g 2wt% sodium hydroxide aqueous solution are mixed, stirred at 60 ℃ for 30 minutes, then warming to 80 ℃, add 0.2g azobisisobutyronitrile, stirred 40 minutes, then drip the oil phase that 10g step S1 obtains, time for adding is 20 minutes, warming to 90 ℃, continuing process 1.5 hours, finally be cooled to 50 ℃, add the triethanolamine aqueous solution of 10g0.1mol / L, obtain modification functional agent.

[0050] Example 2 The preparation method of a precision cold peeling tape for electronic equipment manufacturing is basically the same as that of Example 1, the only difference being the preparation method of the modifying functional agent.

[0051] The preparation method of the modified functional agent is as follows: S1, 18g of terpene resin was mixed with 1.5g of nickel-based catalyst, stirred for 30 minutes, 50g of solvent oil and 5g of water were added, the reaction system was sealed, and a hydrogenation device was connected. 4MPa of hydrogen was introduced at 150°C and stirred for 4 hours. After the reaction was completed, the mixture was cooled to room temperature and allowed to stand until stratification, and the upper oil phase was taken to obtain an oil phase; S2, 25g andrographolide, 1g sodium lauryl sulfate, 50g 2wt% sodium hydroxide aqueous solution are mixed, stirred at 60 ℃ for 30 minutes, then warming to 80 ℃, add 0.2g azobisisobutyronitrile, stirred 40 minutes, then drip the oil phase that 10g step S1 obtains, time for adding is 20 minutes, warming to 90 ℃, continuing process 1.5 hours, finally be cooled to 50 ℃, add the triethanolamine aqueous solution of 10g0.1mol / L, obtain modification functional agent.

[0052] Example 3 The preparation method of a precision cold peeling tape for electronic equipment manufacturing is basically the same as that of Example 1, the only difference being the preparation method of the modifying functional agent.

[0053] The preparation method of the modified functional agent is as follows: S1, 18g phenolic resin is mixed with 1.5g nickel-based catalyst, stirred for 30 minutes, 50g solvent oil and 5g water are added, the reaction system is sealed, and a hydrogenation unit is connected, 4MPa hydrogen is introduced at 150°C, and the stirring reaction is carried out for 4 hours. After the reaction is completed, it is cooled to room temperature, allowed to stand until stratification, and the upper oil phase is taken to obtain an oil phase; S2, 25g andrographolide, 1g sodium lauryl sulfate, 50g 2wt% sodium hydroxide aqueous solution are mixed, stirred at 60 ℃ for 30 minutes, then warming to 80 ℃, add 0.2g azobisisobutyronitrile, stirred 40 minutes, then drip the oil phase that 10g step S1 obtains, time for adding is 20 minutes, warming to 90 ℃, continuing process 1.5 hours, finally be cooled to 50 ℃, add the triethanolamine aqueous solution of 10g0.1mol / L, obtain modification functional agent.

[0054] Example 4 The preparation method of a precision cold peeling tape for electronic equipment manufacturing is basically the same as that of Example 1, the only difference being the preparation method of the modifying functional agent.

[0055] The preparation method of the modified functional agent is as follows: S1, 18g of rosin was mixed with 1.5g of nickel-based catalyst, stirred for 30 minutes, 50g of solvent oil and 5g of water were added, the reaction system was sealed, and a hydrogenation device was connected. 4MPa of hydrogen was introduced at 150°C and stirred for 4 hours. After the reaction was completed, the mixture was cooled to room temperature and allowed to stand until stratification, and the upper oil phase was taken to obtain an oil phase; S2, 25g of 2-(methacryloyloxy)ethyl caprolactone, 1g of sodium laurylsulfonate, and 50g of a 2wt% aqueous sodium hydroxide solution were mixed, stirred at 60°C for 30 minutes, then heated to 80°C, 0.2g of azobisisobutyronitrile was added, stirred for 40 minutes, and then 10g of the oil phase obtained in step S1 was added dropwise, the addition time was 20 minutes, the temperature was raised to 90°C, the process was continued for 1.5 hours, and finally cooled to 50°C, 10g of a 0.1mol / L aqueous triethanolamine solution was added to obtain a functional modification agent.

[0056] Example 5 The preparation method of a precision cold peeling tape for electronic equipment manufacturing is basically the same as that of Example 1, the only difference being the preparation method of the modifying functional agent.

[0057] The preparation method of the modified functional agent is as follows: S1, 18g of rosin was mixed with 1.5g of nickel-based catalyst, stirred for 30 minutes, 50g of solvent oil and 5g of water were added, the reaction system was sealed, and a hydrogenation device was connected. 4MPa of hydrogen was introduced at 150°C and stirred for 4 hours. After the reaction was completed, the mixture was cooled to room temperature and allowed to stand until stratification, and the upper oil phase was taken to obtain an oil phase; S2, 25g 2-(methacryloyloxy) ethyl 3-hydroxybutyrate, 1g sodium lauryl sulfonate, 50g 2wt% sodium hydroxide aqueous solution were mixed, stirred at 60 ° C for 30 minutes, then heated to 80 ° C, 0.2g azobisisobutyronitrile was added, stirred for 40 minutes, and then 10g of the oil phase obtained in step S1 was added dropwise, the addition time was 20 minutes, the temperature was raised to 90 ° C, the treatment was continued for 1.5 hours, and finally cooled to 50 ° C, 10g of 0.1mol / L triethanolamine aqueous solution was added to obtain a functional modification agent.

[0058] Comparative Example 1 The preparation method of a precision cold peeling tape for electronic equipment manufacturing is basically the same as that of Example 1, the only difference being the preparation method of the modifying functional agent.

[0059] The preparation method of the modified functional agent is as follows: S1, 18g epoxy resin and 1.5g nickel-based catalyst were mixed and stirred for 30 minutes, 50g solvent oil and 5g water were added, the reaction system was sealed, and a hydrogenation device was connected. 4MPa hydrogen was introduced at 150°C and stirred for 4 hours. After the reaction was completed, it was cooled to room temperature and allowed to stand until stratification, and the upper oil phase was taken to obtain an oil phase; S2, 25g andrographolide, 1g sodium lauryl sulfate, 50g 2wt% sodium hydroxide aqueous solution are mixed, stirred at 60 ℃ for 30 minutes, then warming to 80 ℃, add 0.2g azobisisobutyronitrile, stirred 40 minutes, then drip the oil phase that 10g step S1 obtains, time for adding is 20 minutes, warming to 90 ℃, continuing process 1.5 hours, finally be cooled to 50 ℃, add the triethanolamine aqueous solution of 10g0.1mol / L, obtain modification functional agent.

[0060] Comparative Example 2 The preparation method of a precision cold peeling tape for electronic equipment manufacturing is basically the same as that of Example 1, the only difference being the preparation method of the modifying functional agent.

[0061] The preparation method of the modified functional agent is as follows: S1, 18g of rosin was mixed with 1.5g of nickel-based catalyst, stirred for 30 minutes, 50g of solvent oil and 5g of water were added, the reaction system was sealed, and a hydrogenation device was connected. 4MPa of hydrogen was introduced at 150°C and stirred for 4 hours. After the reaction was completed, the mixture was cooled to room temperature and allowed to stand until stratification, and the upper oil phase was taken to obtain an oil phase; S2, 25g hydroxyethyl acrylate, 1g sodium lauryl sulfonate, 50g 2wt% sodium hydroxide aqueous solution were mixed, stirred at 60°C for 30 minutes, then heated to 80°C, 0.2g azobisisobutyronitrile was added, stirred for 40 minutes, then 10g of the oil phase obtained in step S1 was added dropwise, the addition time was 20 minutes, the temperature was raised to 90°C, the treatment was continued for 1.5 hours, and finally the temperature was lowered to 50°C, 10g of 0.1mol / L triethanolamine aqueous solution was added to obtain a functional modification agent.

[0062] Comparative Example 3 The preparation method of a precision cold peeling tape for electronic equipment manufacturing is basically the same as that of Example 1, the only difference being that the modifying functional agent is replaced with an equal amount of rosin.

[0063] Comparative Example 4 The preparation method of a precision cold peeling tape for electronic equipment manufacturing is basically the same as that of Example 1, the only difference being the preparation method of the hot melt adhesive.

[0064] The preparation method of the hot melt adhesive comprises the following steps: Step 1: 10 g of acrylic acid, 80 g of 2-ethylhexyl acrylate, 120 g of isooctyl acrylate, and 450 g of dioctyl phthalate were added to 600 g of ethyl acetate, mixed, and stirred at 50° C. to prepare a premix; 4 g of benzoyl peroxide was dissolved in 1496 g of ethyl acetate and stirred to prepare an initiator solution; Step 2: Place 500 g of the initiator solution prepared in step 1 into the reactor, stir at 300 rpm, heat to 85 ° C and maintain for 20 minutes; add 400 g of the premix prepared in step 1 to the reactor, raise the temperature in the reactor to 90 ° C after 0.5 hours, react violently, and when the temperature drops to 85 ° C, the initial reaction is completed; use a burette to continuously drop 860 g of the premix prepared in step 1 into the reactor, the titration time is 3 hours, the temperature in the reactor is maintained at 85 ° C, and the remaining initiator solution prepared in step 1 is simultaneously dropped into the reactor, the titration time is 2 hours, and after the titration is completed, maintain a constant temperature of 85 ° C, adjust the speed to 300 rpm, treat for 2 hours, then cool the temperature in the reactor to 30 ° C, filter the product through a 200 mesh filter to obtain a hot melt adhesive.

[0065] Test Example 1 Residual glue rate test The precision cold-peel tape prepared in the present invention was bonded to a standard steel plate and placed in a 120°C oven for 4 hours. Afterwards, it was removed and allowed to rest for 2 hours. A peel test was performed on the tape according to the test method specified in GB / T 2792-2014, "Test Method for Peel Strength of Adhesive Tapes," at a peel speed of 300 mm / min. The residual adhesive on the standard steel plate was observed. Detailed test data is shown in Table 1.

[0066] Table 1

[0067] Test Example 2 High temperature and high humidity aging performance test The precision cold peeling tape prepared in the present invention was bonded to a standard metal steel plate and tested for its adhesive retention performance in an environment of 85°C and 85% humidity. A 1 kg weight was hung on the plate, and the final drop time was measured. The test results are shown in Table 2.

[0068] Table 2

[0069] From the data of test examples 1 and 2, it can be seen that the precision cold peeling tape prepared in Example 1 has the lowest adhesive residue rate and the best high temperature and high humidity aging performance.

[0070] The modified functional agent prepared using rosin in Example 1 exhibits excellent performance. This is because rosin itself is rich in reactive functional groups such as carboxyl groups and double bonds. These structures can form highly efficient active sites with nickel-based catalysts during hydrogenation reactions, producing an oily product with high flexibility and thermal stability. This oily product then forms stable chemical bonds with andrographolide during the subsequent polymerization reaction, significantly enhancing the adhesive tape's adhesion and peeling properties. Compared to other modifiers, terpene resins offer good adhesion but are less active and have lower product stability; phenolic resins offer high thermal stability but lack flexibility; and epoxy resins offer good chemical resistance but are less stable in high-temperature and high-humidity environments than the rosin-modified functional agent. Furthermore, unmodified rosin has limited dispersibility and reactivity in hot-melt adhesive systems, resulting in poor performance. Therefore, the rosin-modified functional agent can effectively reduce residual adhesive content and maintain excellent aging resistance under high-temperature and high-humidity conditions, demonstrating significant advantages in the preparation of precision cold-peel tapes.

[0071] The modified functional agent prepared using andrographolide in Example 1 showed a low residual glue rate and excellent high temperature and high humidity aging performance, and its mechanism of action may be related to the chemical structure and reaction characteristics of andrographolide. Andrographolide is a natural product with a unique chemical structure, comprising hydroxyl, double bond and ester functional groups, which can provide good reactivity during the reaction process. In the preparation of the modified functional agent, andrographolide can form a stable chemical bond by combining with the oil phase, thereby enhancing the cohesive strength and adhesion performance of the hot melt adhesive. In contrast, although the 2-(methacryloyloxy)ethyl caprolactone used in Example 4 and the 2-(methacryloyloxy)ethyl 3-hydroxybutyrate used in Example 5 also have similar functional groups, their reactivity may not be as good as andrographolide. The hydroxyethyl acrylate used in Comparative Example 2 lacks the polyhydroxy structure in andrographolide, resulting in its poor stability under high temperature and high humidity environments. Furthermore, the polyhydroxy structure of andrographolide can form hydrogen bonds or covalent bonds with other components in hot-melt adhesives (such as acrylate monomers), further improving the tape's aging resistance. This structural advantage enables andrographolide-modified functional agents to exhibit superior adhesion and lower adhesive residue under high temperature and humidity conditions.

[0072] In the present invention, the interaction between rosin and andrographolide is primarily manifested during the preparation of the functional modifying agent. Rosin is rich in reactive functional groups such as carboxyl groups and double bonds. These functional groups form highly efficient active sites with nickel-based catalysts during hydrogenation reactions, generating an oil-phase product with high flexibility and thermal stability. Andrographolide, through its unique chemical structure (e.g., hydroxyl groups, double bonds, and ester groups), combines with the oil generated from rosin to form a stable chemical bond. This combination not only enhances the cohesive strength and adhesion of the hot melt adhesive, but also significantly reduces the residual adhesive rate and exhibits superior aging resistance under high temperature and high humidity conditions. The synergistic effect of rosin and andrographolide enables the functional modifying agent to play a key role in cold-peel tapes, improving the tape's overall performance.

Claims

1. A method for preparing a precision cold peeling tape for electronic equipment manufacturing, characterized in that: Here’s how: First, the PET film is installed on the unloading shaft of the automatic tape coating machine, and the film is conveyed to the coating wheel through the transmission device, wherein the coating wheel is evenly coated with hot melt adhesive with a thickness of 50~80μm. Then, the coated PET film is sequentially passed through a 5-zone drying oven for drying, and finally conveyed to the winding wheel and laminated with the release film to complete the preparation of the tape.

2. The method for preparing the precision cold peeling tape for electronic equipment manufacturing according to claim 1, wherein: During the drying process, a 5-zone oven was used for drying, and the temperature settings of each zone of the oven were as follows: The temperature of zone 1 is controlled at 70~90℃; the temperature of zone 2 is controlled at 90~100℃; the temperature of zone 3 is controlled at 90~110℃; the temperature of zone 4 is controlled at 100~120℃; the temperature of zone 5 is controlled at 120~130℃.

3. The method for preparing the precision cold peeling tape for electronic equipment manufacturing according to claim 1, wherein: The thickness of the PET film is 0.025-0.5 mm.

4. The method for preparing the precision cold peeling tape for electronic equipment manufacturing according to claim 1, wherein: The release film has a thickness of 0.025-0.2 mm.

5. The method for preparing the precision cold peeling tape for electronic equipment manufacturing according to claim 1, wherein: The preparation method of the hot melt adhesive comprises the following steps, in parts by weight: Step 1, adding 8 to 12 parts of acrylic acid, 70 to 90 parts of 2-ethylhexyl acrylate, 110 to 130 parts of isooctyl acrylate, 5 to 10 parts of a modifying functional agent and 400 to 500 parts of dioctyl phthalate to 500 to 700 parts of ethyl acetate, mixing, and fully stirring at 40 to 60° C. to prepare a premix; dissolving 3 to 5 parts of benzoyl peroxide in 1400 to 1550 parts of ethyl acetate, stirring evenly, to prepare an initiator solution; Step 2: Place 400-600 parts of the initiator solution prepared in step 1 into a reactor, stir at 200-400 rpm, heat to 80-90°C and maintain for 10-30 minutes; add 300-500 parts of the premix prepared in step 1 to the reactor, raise the temperature in the reactor to 85-95°C after 0.4-0.6 hours, react violently, and when the temperature drops back to 80-90°C, the initial reaction is completed; use a burette to continuously drop 800-1000 parts of the premix prepared in step 1 into the reactor, the titration time is 2-4 hours, and the temperature in the reactor is maintained at 80-90°C. At the same time, the remaining initiator solution prepared in step 1 is simultaneously dropped into the reactor, the titration time is 1-3 hours, and after the titration is completed, maintain a constant temperature of 80-90°C, adjust the speed to 200-400 rpm, treat for 1-3 hours, then cool the temperature in the reactor to 20-40°C, filter the product, and obtain a hot melt adhesive.

6. The method for preparing the precision cold peeling tape for electronic equipment manufacturing according to claim 5, wherein: The filtered product is a product filtered through a 100-300 mesh filter.

7. The method for preparing the precision cold peeling tape for electronic equipment manufacturing according to claim 5, wherein: The preparation method of the modified functional agent is as follows, in parts by weight: S1. Mix 15-20 parts of rosin with 1-2 parts of a nickel-based catalyst, stir for 20-40 minutes, add 40-60 parts of solvent oil and 4-6 parts of water, seal the reaction system, and connect a hydrogenation device. Pass 3-6 MPa of hydrogen at 140-160° C. and stir for 2-6 hours. After the reaction is completed, cool to room temperature, let stand until stratification, and take the upper oil phase to obtain an oil phase; S2, 20-30 parts of andrographolide, 0.5-2 parts of sodium lauryl sulfonate, and 40-60 parts of 1-3 wt% sodium hydroxide aqueous solution are mixed, stirred at 50-70 ° C for 20-40 minutes, then heated to 70-90 ° C, 0.1-0.3 parts of initiator are added, stirred for 30-50 minutes, and then 8-12 parts of the oil phase obtained in step S1 are added dropwise for 10-30 minutes, heated to 80-100 ° C, and treated for 1-2 hours. Finally, the temperature is lowered to 40-55 ° C, and 8-12 parts of 0.05-0.2 mol / L triethanolamine aqueous solution are added to obtain a modified functional agent.

8. The method for preparing the precision cold peeling tape for electronic equipment manufacturing according to claim 7, wherein: The initiator is at least one of azobisisobutyronitrile, dicumyl peroxide, and dibenzoyl peroxide.

9. A precision cold peeling tape for electronic equipment manufacturing, characterized in that: The method is as described in any one of claims 1 to 8.

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