Waterborne acrylate polymer emulsion as well as preparation method and application thereof

Abstract

The invention provides a water-based acrylate polymer emulsion as well as a preparation method and application thereof. The water-based acrylate polymer emulsion is prepared from the following components in parts by weight: 70 to 100 parts of soft monomer, 10 to 20 parts of hard monomer, 3 to 13 parts of functional monomer, 0.2 to 1.7 parts of RAFT (Reversible Addition-Fragmentation Chain Transfer) agent, 0.1 to 6 parts of emulsifier, 0.2 to 0.6 part of initiator, 0.1 to 0.6 part of pH (Potential of Hydrogen) stabilizer and 80 to 150 parts of water, the RAFT chain transfer agent comprises a trithiocarbonate chain transfer agent containing a carboxyl group; the emulsifier comprises a reactive emulsifier and a non-reactive emulsifier. A water-based adhesive tape prepared from the water-based acrylate polymer emulsion provided by the invention has excellent initial adhesion, persistent adhesion and 180-degree peel strength, good water resistance, good aging resistance under high-temperature, high-humidity, high-temperature and low-temperature conditions, good stability and low VOC emission in production and use processes.

Description

Technical Field

[0001] The invention belongs to the technical field of pressure-sensitive adhesives, and in particular relates to an aqueous acrylic ester polymer emulsion and a preparation method and application thereof. Background Art

[0002] Pressure-sensitive adhesive is a type of adhesive that can be firmly bonded to the adherend by applying light finger pressure without the aid of solvents, heat or other means. Its characteristics are that it is easy to stick, easy to peel, and not damaged. The adhesive layer will not dry up for a long time and has very high cohesive strength. In many applications, it is also required to have very good peel strength and retention under low temperature, room temperature, and high temperature conditions. In particular, pressure-sensitive adhesives are required to have good durability in automobile, electronic, and construction applications. Although pressure-sensitive adhesives can also be directly used for bonding various materials and objects like other adhesives, in most cases, pressure-sensitive adhesives are coated on substrates such as plastic films, fabrics, paper or metal foils to be made into pressure-sensitive adhesive products such as pressure-sensitive adhesive tapes and pressure-sensitive adhesive labels.

[0003] In the process of conventional adhesive polymerization or adhesive tape coating, organic solvents are generally used as reaction solvents or diluents. Commonly used solvents include toluene, xylene, ethyl acetate, butyl acetate, acetone, petroleum ether, etc. However, most commonly used solvents are VOC substances, which are easy to volatilize. Not only do they cause health hazards to production personnel, but also the residual solvents in the double-sided adhesive during use will affect the health of users. With the improvement of environmental protection requirements and the emphasis on health, higher requirements are put forward for odor and low VOCs on the premise of ensuring performance. Water-based is a very good solution recognized by the industry. Water-based tape uses water as the dispersion medium in the preparation process of pressure-sensitive adhesive, which has the advantage of low VOC emissions. However, the current water-based tape still has shortcomings in terms of bonding performance, water resistance and stability, which need further improvement.

[0004] CN117720871A discloses a water-based flame-retardant acrylic pressure-sensitive adhesive and its application. The composition of the water-based flame-retardant acrylic pressure-sensitive adhesive is as follows: acrylate hydrophilic monomer: 4% to 30%; acrylate lipophilic monomer: 4% to 30%; phosphorus-containing flame-retardant monomer: 2% to 20%; water-based initiator: 0.1% to 5%; stabilizer: 0.1% to 5%; deionized water: 20% to 80%. The present invention prepares a water-based flame-retardant acrylic pressure-sensitive adhesive by soap-free emulsion polymerization. The pressure-sensitive adhesive not only meets the requirements of low VOC, but also has excellent high temperature and high humidity resistance and flame retardancy, but the bonding performance still needs to be improved.

[0005] Therefore, it is necessary to develop a water-based tape with good bonding performance, good water resistance and good stability. Summary of the invention

[0006] In view of the shortcomings of the prior art, the present invention aims to provide an aqueous acrylic polymer emulsion and a preparation method and application thereof. The water-based adhesive tape made from the aqueous acrylic polymer emulsion has excellent initial tack, sustained tack and 180° peel strength, good water resistance, good aging resistance under high temperature and high humidity, high temperature and low temperature conditions, good stability, and low VOC emissions during production and use.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] In a first aspect, the present invention provides an aqueous acrylic polymer emulsion, which comprises the following components in parts by weight: 70 to 100 parts (e.g., 75, 80, 85, 90 or 95 parts) of a soft monomer, 10 to 20 parts (e.g., 11, 12, 13, 14, 15, 16, 17, 18 or 19 parts) of a hard monomer, 3 to 13 parts (e.g., 4, 5, 6, 7, 8, 9, 10, 11 or 12 parts) of a functional monomer, and 0.2 to 1.7 parts (e.g., 0.4, 0.6, 0.8, 1.0, 1.2, 1.4 or 1.6) of a RAFT chain transfer agent. parts, etc.), emulsifier 0.1-6 parts (for example, 0.15 parts, 0.2 parts, 0.25 parts, 0.3 parts, 0.35 parts, 0.4 parts, 0.45 parts, 0.5 parts or 0.55 parts, etc.), initiator 0.2-0.6 parts (for example, 0.25 parts, 0.3 parts, 0.35 parts, 0.4 parts, 0.45 parts, 0.5 parts or 0.55 parts, etc.), pH stabilizer 0.1-0.6 parts (for example, 0.15 parts, 0.2 parts, 0.25 parts, 0.3 parts, 0.35 parts, 0.4 parts, 0.45 parts, 0.5 parts or 0.55 parts, etc.) and water 80-150 parts (for example, 90 parts, 100 parts, 110 parts, 120 parts, 130 parts or 140 parts, etc.);

[0009] The RAFT chain transfer agent includes a carboxyl-containing trithiocarbonate chain transfer agent; and the emulsifier includes a reactive emulsifier and a non-reactive emulsifier.

[0010] In the present invention, by reasonably matching soft monomers, hard monomers and functional monomers, adding a RAFT chain transfer agent to carry out RAFT emulsion polymerization, the prepared acrylate polymer has a suitable molecular weight and molecular weight distribution, and the water-based adhesive tape prepared by the acrylate polymer has excellent initial tack, sustained tack and 180° peel strength; by introducing functional monomers, and reasonably matching auxiliary agents such as emulsifiers and pH stabilizers, the stability of the water-based acrylate polymer emulsion during storage and use is guaranteed, and demulsification, stratification and the like are not easy to occur, thereby ensuring the water resistance of the water-based adhesive tape prepared by the acrylate polymer emulsion and the stability during storage and use, and preventing stratification, degumming and the like. The water-based adhesive tape prepared by the water-based acrylate polymer emulsion has excellent initial tack, sustained tack and 180° peel strength, good water resistance, good aging resistance under high temperature and humidity, high temperature and low temperature conditions, good stability, and low VOC emissions during production and use.

[0011] Preferably, the soft monomer includes any one of butyl acrylate, isooctyl acrylate, ethyl acrylate or lauryl acrylate, or a combination of at least two of them, and more preferably butyl acrylate and isooctyl acrylate.

[0012] Preferably, the hard monomer includes any one of methyl methacrylate, isobornyl methacrylate, styrene or isobornyl acrylate, or a combination of at least two thereof, and more preferably methyl methacrylate.

[0013] Preferably, the functional monomer includes any one of acrylic acid (AA), hydroxyethyl methacrylate (HEMA) or glycidyl methacrylate (GMA) or a combination of at least two thereof, and more preferably acrylic acid and hydroxyethyl methacrylate.

[0014] Preferably, the carboxyl-containing trithiocarbonate chain transfer agent comprises 2-(dodecylthiocarbonylthio)-2-methylpropionic acid and / or 4-cyano-4-((dodecylthiocarbonyl)thio)pentanoic acid (CDTPA).

[0015] Preferably, the reactive emulsifier includes allyloxy nonylphenol polyoxyethylene ether ammonium sulfate and / or maleic anhydride reactive emulsifier.

[0016] Preferably, the non-reactive emulsifier includes an anionic emulsifier and / or a nonionic emulsifier.

[0017] Preferably, the anionic emulsifier comprises sodium dodecylbenzenesulfonic acid and / or sodium alkyl sulfosuccinate.

[0018] Preferably, the nonionic emulsifier comprises an alkyl glycoside.

[0019] Preferably, the initiator comprises ammonium persulfate and / or potassium persulfate.

[0020] Preferably, the pH stabilizer includes any one of sodium bicarbonate, triethanolamine or sodium citrate, or a combination of at least two thereof.

[0021] Preferably, the water comprises deionized water.

[0022] Preferably, the aqueous acrylic polymer emulsion comprises the following components by weight: 35-60 parts (e.g., 38 parts, 41 parts, 44 parts, 47 parts, 50 parts, 53 parts, 56 parts or 59 parts) of butyl acrylate, 25-40 parts (e.g., 28 parts, 31 parts, 34 parts, 37 parts, 40 parts, 43 parts, 46 parts or 49 parts) of isooctyl acrylate, 10-20 parts (e.g., 11 parts, 12 parts) of methyl methacrylate. , 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts or 19 parts, etc.), acrylic acid 2-8 parts (for example, 3 parts, 4 parts, 5 parts, 6 parts or 7 parts, etc.), hydroxyethyl methacrylate 1-5 parts (for example, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts or 4.5 parts, etc.), 2-(dodecylthiothiocarbonylthio)-2-methylpropionic acid 0.5-1.7 parts (for example, 0.7 parts, 0.9 parts, 1.1 parts , 1.3 or 1.5 parts, etc.), reactive emulsifier 2-4 parts (for example, 2.2 parts, 2.4 parts, 2.6 parts, 2.8 parts, 3.0 parts, 3.2 parts, 3.4 parts, 3.6 parts or 3.8 parts, etc.), non-reactive emulsifier 0.5-1.5 parts (for example, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, 1.0 parts, 1.1 parts, 1.2 parts, 1.3 parts or 1.4 parts, etc.), initiator 0.2-0.6 parts (for example, Such as 0.25 parts, 0.3 parts, 0.35 parts, 0.4 parts, 0.45 parts, 0.5 parts or 0.55 parts, etc.), 0.1-0.6 parts of pH stabilizer (for example 0.15 parts, 0.2 parts, 0.25 parts, 0.3 parts, 0.35 parts, 0.4 parts, 0.45 parts, 0.5 parts or 0.55 parts, etc.) and 80-150 parts of water (for example 90 parts, 100 parts, 110 parts, 120 parts, 130 parts or 140 parts, etc.).

[0023] In a second aspect, the present invention provides a method for preparing the aqueous acrylic polymer emulsion as described in the first aspect, the preparation method comprising the following steps:

[0024] (1) Mix part of water, emulsifier, RAFT chain transfer agent, soft monomer, hard monomer and functional monomer to obtain a pre-emulsion.

[0025] (2) The remaining water and the initiator are mixed to obtain an initiator solution.

[0026] (3) mixing the pre-emulsion obtained in step (1) and the initiator solution obtained in step (2), reacting them, and adding a pH stabilizer to obtain the aqueous acrylate polymer emulsion.

[0027] Wherein, step (1) and step (2) are performed in no particular order, or are performed simultaneously.

[0028] Preferably, based on the total mass of water as 100%, the mass of the water in the portion is 50% to 60%, for example 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58% or 59%, etc.

[0029] Preferably, step (1) specifically comprises the following steps: uniformly mixing part of the water and the emulsifier, adding the RAFT chain transfer agent and stirring and mixing, and then dropwise adding the mixed solution of the soft monomer, the hard monomer and the functional monomer for pre-emulsification to obtain a pre-emulsion.

[0030] Preferably, the pre-emulsification is carried out under stirring, the stirring speed is 300-600 r / min (for example, 350 r / min, 400 r / min, 450 r / min, 500 r / min or 550 r / min, etc.), and the time is 30-60 min (for example, 33 min, 36 min, 39 min, 42 min, 45 min, 48 min, 51 min, 54 min or 57 min, etc.).

[0031] Preferably, the step (3) specifically comprises the following steps: heating the pre-emulsion obtained in step (1) to 70-85°C (e.g., 72°C, 74°C, 76°C, 78°C, 80°C, 82°C or 84°C, etc.), adding part of the initiator solution obtained in step (2) to initiate the reaction, and then dripping the remaining initiator solution obtained in step (2) to react, the dripping time being 2-4h (e.g., 2.2h, 2.4h, 2.6h, 2.8h, After the dropwise addition is completed, the reaction is continued by heat preservation for 1 to 2 hours (for example, 1.1 hours, 1.2 hours, 1.3 hours, 1.4 hours, 1.5 hours, 1.6 hours, 1.7 hours, 1.8 hours or 1.9 hours), cooled to ≤40°C (for example, 10°C, 15°C, 20°C, 25°C, 30°C or 35°C), and a pH stabilizer is added to adjust the pH to obtain the aqueous acrylate polymer emulsion.

[0032] Preferably, based on the total mass of the initiator solution prepared in step (2) as 100%, the mass of the initiator solution prepared in the part of step (2) is 8% to 13%, for example, 8.5%, 9%, 9.5%, 10%, 10.5%, 11%, 11.5%, 12% or 12.5%, etc.

[0033] Preferably, the pH is adjusted to 7-9 (eg, 7.2, 7.4, 7.6, 7.8, 8.0, 8.2, 8.4, 8.6 or 8.8, etc.).

[0034] Preferably, the step (3) specifically comprises the following steps: heating part of the pre-emulsion obtained in step (1) to 70-85°C (e.g., 72°C, 74°C, 76°C, 78°C, 80°C, 82°C or 84°C, etc.), adding part of the initiator solution obtained in step (2) to initiate the reaction, and then simultaneously dripping the remaining initiator solution obtained in step (2) and the remaining pre-emulsion obtained in step (1) to react, the dripping time being 2-4h (e.g., 2.2h, 2.4h, After the dropwise addition is completed, the reaction is continued by heat preservation for 1 to 2 hours (for example, 1.1 h, 1.2 h, 1.3 h, 1.4 h, 1.5 h, 1.6 h, 1.7 h, 1.8 h or 1.9 h, etc.), cooled to ≤40°C (for example, 10°C, 15°C, 20°C, 25°C, 30°C or 35°C, etc.), and a pH stabilizer is added to adjust the pH to obtain the aqueous acrylate polymer emulsion.

[0035] Preferably, based on the total mass of the pre-emulsion obtained in step (1) as 100%, the mass of the pre-emulsion obtained in the part of step (1) is 25% to 35%, for example, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33% or 34%, etc.

[0036] Preferably, based on the total mass of the initiator solution prepared in step (2) as 100%, the mass of the initiator solution prepared in the part of step (2) is 3% to 8%, for example, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7% or 7.5%, etc.

[0037] Preferably, the pH is adjusted to 7-9 (eg, 7.2, 7.4, 7.6, 7.8, 8.0, 8.2, 8.4, 8.6 or 8.8, etc.).

[0038] In a third aspect, the present invention provides a pressure-sensitive adhesive solution, which includes the aqueous acrylic polymer emulsion as described in the first aspect, an aqueous tackifying resin, a wetting agent and a defoaming agent.

[0039] Preferably, the pressure-sensitive adhesive solution also includes an antioxidant.

[0040] Preferably, the pressure-sensitive adhesive solution comprises the following components in parts by weight: 80-100 parts (e.g., 82 parts, 84 parts, 86 parts, 88 parts, 90 parts, 92 parts, 94 parts, 96 parts or 98 parts) of the aqueous acrylate polymer emulsion as described in the first aspect, 5-20 parts (e.g., 7 parts, 9 parts, 11 parts, 13 parts, 15 parts, 17 parts or 19 parts) of an aqueous tackifying resin, 0.5-2 parts (e.g., 0.7 part, 0.9 part, 1.1 part, 1.3 part, 1.5 part, 1.7 part or 1.9 part, etc.), 0.1-0.5 part (for example, 0.15 part, 0.2 part, 0.25 part, 0.3 part, 0.35 part, 0.4 part or 0.45 part, etc.) of antioxidant and 0.1-0.5 part (for example, 0.15 part, 0.2 part, 0.25 part, 0.3 part, 0.35 part, 0.4 part or 0.45 part, etc.) of defoaming agent.

[0041] In the present invention, an aqueous acrylic polymer emulsion is combined with an aqueous tackifying resin to improve the initial tack, sustained tack and 180° peel strength of the water-based tape prepared from the pressure-sensitive adhesive solution; an antioxidant is added to the pressure-sensitive adhesive solution to improve the antioxidant performance of the water-based tape prepared from the pressure-sensitive adhesive solution, reduce yellowing, and extend its service life, making it particularly suitable for application scenarios where it is exposed to the environment for a long time.

[0042] Preferably, the water-based tackifying resin comprises any one or a combination of at least two of natural rosin, rosin derivatives, terpene resins, terpene phenolic resins, polyurethane-modified water-based tackifying resins, dicyclopentadiene resins, maleic anhydride-modified petroleum resins or alkylphenolic resins.

[0043] Preferably, the rosin derivative comprises rosin ester.

[0044] Preferably, the terpene resin is an aqueous terpene resin emulsion.

[0045] Preferably, the terpene phenolic resin is an aqueous terpene phenolic resin emulsion.

[0046] Preferably, the wetting agent includes any one of a polyether-modified polysiloxane wetting agent, an acetylene glycol wetting agent, a polyether phosphate wetting agent or a non-silicon and non-fluorine high-activity surfactant, or a combination of at least two thereof.

[0047] Preferably, the antioxidant comprises a hindered phenol antioxidant.

[0048] Preferably, the defoaming agent comprises a polyether-modified silicone defoaming agent.

[0049] In a fourth aspect, the present invention provides a method for preparing the pressure-sensitive adhesive solution as described in the third aspect, the preparation method comprising the following steps: mixing an aqueous acrylic polymer emulsion, an aqueous tackifying resin, a wetting agent, an antioxidant and a defoaming agent to obtain the pressure-sensitive adhesive solution.

[0050] Preferably, the preparation method specifically comprises the following steps:

[0051] (a) Mixing an antioxidant and a portion of the aqueous acrylic polymer emulsion to obtain a first mixed solution.

[0052] (b) mixing the first mixed solution obtained in step (a), the tackifying resin and the remaining aqueous acrylic polymer emulsion to obtain a second mixed solution.

[0053] (c) mixing the second mixed solution obtained in step (b) with a wetting agent, and then adding a defoaming agent to mix, thereby obtaining the pressure-sensitive adhesive solution.

[0054] Preferably, based on the total mass of the aqueous acrylate polymer emulsion as 100%, the mass of the aqueous acrylate polymer emulsion of the portion is 10% to 13%, for example, 10.3%, 10.6%, 10.9%, 11.2%, 11.5%, 11.8%, 12.1%, 12.4% or 12.7%, etc.

[0055] Preferably, the stirring speed of the mixing in step (b) is 400-500 rpm (for example, 410 rpm, 430 rpm, 450 rpm, 470 rpm or 490 rpm, etc.), and the time is 10-15 min (for example, 10.5 min, 11 min, 11.5 min, 12 min, 12.5 min, 13 min, 13.5 min, 14 min or 14.5 min, etc.).

[0056] Preferably, the adding of the defoaming agent and mixing in step (c) specifically includes adding the defoaming agent dropwise at a stirring speed of 500 to 600 rpm (for example, 510 rpm, 530 rpm, 550 rpm, 570 rpm or 590 rpm, etc.), and then continuing stirring for 30 to 40 min (for example, 31 min, 32 min, 33 min, 34 min, 35 min, 36 min, 37 min, 38 min or 39 min, etc.).

[0057] Preferably, step (c) further comprises the steps of standing and filtering after adding the defoaming agent and mixing.

[0058] In the present invention, by adopting the preparation method of steps (a) to (c), the mixing of air is reduced while ensuring that each component is fully dispersed.

[0059] In a fifth aspect, the present invention provides a water-based tape, comprising an adhesive film layer prepared from the pressure-sensitive adhesive solution as described in the third aspect.

[0060] Preferably, the water-based adhesive tape comprises a first release film layer, an adhesive film layer and a second release film layer.

[0061] Preferably, the thickness of the adhesive film layer is 25-100 μm (eg, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm or 90 μm, etc.).

[0062] Preferably, the first release film layer is a single silicon release film with a thickness of 50 to 75 μm (for example, 55 μm, 60 μm, 65 μm or 70 μm, etc.) and a release force of 10 to 25 gf / 25mm (for example, 12 gf / 25mm, 14 gf / 25mm, 16 gf / 25mm, 18 gf / 25mm, 20 gf / 25mm, 22 gf / 25mm or 24 gf / 25mm, etc.).

[0063] Preferably, the second release film layer is a single silicon release film with a thickness of 20 to 50 μm (for example, 25 μm, 30 μm, 35 μm, 40 μm or 45 μm, etc.) and a release force of 3 to 6 gf / 25mm (for example, 3.5 gf / 25mm, 4gf / 25mm, 4.5 gf / 25mm, 5gf / 25mm or 5.5 gf / 25mm, etc.).

[0064] Preferably, the water-based tape is prepared by the following method: coating the pressure-sensitive adhesive solution as described in the third aspect on the first release film layer, drying to form an adhesive film layer, and laminating the second release film layer to obtain the water-based tape.

[0065] Preferably, the coating comprises knife coating or roller coating.

[0066] Preferably, the drying temperature is 60-120°C (eg, 70°C, 80°C, 90°C, 100°C or 110°C, etc.), and the drying time is 5-8 min (eg, 5.5 min, 6 min, 6.5 min, 7 min or 7.5 min, etc.).

[0067] Compared with the prior art, the present invention has the following beneficial effects:

[0068] In the present invention, by reasonably matching soft monomers, hard monomers and functional monomers, adding RAFT chain transfer agents to carry out RAFT emulsion polymerization, the prepared acrylate polymer has a suitable molecular weight and molecular weight distribution, and the water-based adhesive tape prepared by the acrylate polymer has excellent initial tack, sustained tack and 180° peel strength; by introducing functional monomers, and reasonably matching auxiliary agents such as emulsifiers and pH stabilizers, the stability of the water-based acrylate polymer emulsion during storage and use is guaranteed, and demulsification, stratification and the like are not easy to occur, thereby ensuring the water resistance of the water-based adhesive tape prepared by the acrylate polymer emulsion and the stability during storage and use, and preventing stratification, degumming and the like. The water-based adhesive tape prepared by the water-based acrylate polymer emulsion has excellent initial tack, sustained tack and 180° peel strength, good water resistance, good aging resistance under high temperature and humidity, high temperature and low temperature conditions, good stability, and low VOC emissions during production and use. The 180° peel strength of the water-based tape is ≥17N / 25mm, and the initial tack is ≥15N / 25mm. Preferably, the 180° peel strength is ≥18N / 25mm, and the initial tack is ≥20N / 25mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Figure 1 A schematic diagram of the structure of the water-based tape provided in Example 1;

[0070] Among them, 1-first release film layer; 2-adhesive film layer; 3-second release film layer. DETAILED DESCRIPTION

[0071] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0072] The sources of some raw materials in the following examples and comparative examples are as follows:

[0073] Terpene resin aqueous emulsion: brand F0308-X, manufacturer Shenzhen Yoshida Chemical;

[0074] Terpene phenolic resin aqueous emulsion: brand name BF-355, manufacturer: Foshan Baolin Chemical;

[0075] Polyurethane modified water-based tackifying resin: brand W-600, manufacturer: Arakawa Chemical;

[0076] Polyether modified polysiloxane wetting agent: brand name Tego450, manufacturer Evonik;

[0077] Alkyne diol wetting agent: brand name Dynol 607, manufacturer Evonik;

[0078] Hindered phenol antioxidant: brand name is KY616-5, manufacturer is Jiangsu Fiyta Chemical;

[0079] Polyether modified silicone defoamer: brand name SGR1831, manufacturer is Xingrui (Shandong) Environmental Technology Co., Ltd.

[0080] Example 1

[0081] The present embodiment provides an aqueous acrylic polymer emulsion and a preparation method thereof, a pressure-sensitive adhesive solution, and an aqueous tape. The aqueous acrylic polymer emulsion includes the following components in parts by weight: 45 parts of butyl acrylate, 28 parts of isooctyl acrylate, 15 parts of methyl methacrylate, 6 parts of acrylic acid, 2 parts of hydroxyethyl methacrylate, 1 part of 2-(dodecylthiothiocarbonylthio)-2-methylpropionic acid, 3 parts of allyloxynonylphenol polyoxyethylene ether ammonium sulfate, 1 part of sodium dodecylbenzene sulfonate, 0.4 parts of ammonium persulfate, 0.3 parts of sodium bicarbonate, and 100 parts of deionized water.

[0082] The preparation method comprises the following steps:

[0083] (1) In a reaction kettle equipped with a stirrer, a thermometer and a reflux condenser, a portion of deionized water, ammonium allyloxy nonylphenol polyoxyethylene ether sulfate and sodium dodecylbenzene sulfonate are added, and after stirring evenly, 2-(dodecylthiothiocarbonylthio)-2-methylpropionic acid is added and stirred for 20 minutes to fully dissolve it, and then a mixed solution of butyl acrylate, isooctyl acrylate, methyl methacrylate, acrylic acid and hydroxyethyl methacrylate is added dropwise, and pre-emulsification is performed at a stirring speed of 400 rpm for 45 minutes to obtain a pre-emulsion;

[0084] Taking the total mass of deionized water as 100%, the mass of the deionized water in the above-mentioned portion is 55%;

[0085] (2) mixing the remaining deionized water and ammonium persulfate to obtain an initiator solution;

[0086] (3) heating part of the pre-emulsion prepared in step (1) to 80° C., adding part of the initiator solution prepared in step (2) to initiate the reaction, and then simultaneously adding dropwise the remaining initiator solution prepared in step (2) and the remaining pre-emulsion prepared in step (1) to react, the dropping time being 3 hours, and continuing to keep the temperature at 80° C. for 2 hours after the dropwise addition is completed. After the reaction is completed, cooling to 35° C., adding sodium bicarbonate, and obtaining the aqueous acrylate polymer emulsion;

[0087] Taking the total mass of the pre-emulsion prepared in step (1) as 100%, the mass of the pre-emulsion prepared in step (1) of the above part is 28%;

[0088] Taking the total mass of the initiator solution prepared in step (2) as 100%, the mass of the initiator solution prepared in step (2) of the above part is 5%.

[0089] The pressure-sensitive adhesive solution includes the following components in parts by weight: 80 parts of the above-mentioned aqueous acrylate polymer emulsion, 15 parts of aqueous tackifying resin (terpene resin aqueous emulsion), 1.2 parts of wetting agent (polyether-modified polysiloxane wetting agent), 0.3 parts of antioxidant (hindered phenol antioxidant) and 0.3 parts of defoaming agent (polyether-modified silicone defoaming agent).

[0090] The pressure-sensitive adhesive solution is prepared by the following method:

[0091] (a) dissolving an antioxidant in a portion of the aqueous acrylate polymer emulsion to obtain a first mixed solution; based on the total mass of the aqueous acrylate polymer emulsion being 100%, the mass of the portion of the aqueous acrylate polymer emulsion is 12%;

[0092] (b) adding the first mixed solution obtained in step (a), the tackifying resin and the remaining aqueous acrylic polymer emulsion into a stirring tank, and stirring at a stirring speed of 500 rpm for 15 min to obtain a second mixed solution;

[0093] (c) After adding a wetting agent to the second mixed solution obtained in step (b), a defoaming agent was added dropwise at a stirring speed of 600 rpm, and then the mixture was stirred for 30 min, allowed to stand for 1 h, and filtered to obtain the pressure-sensitive adhesive solution.

[0094] The water-based tape, such as Figure 1 It includes a first release film layer 1, an adhesive film layer 2 and a second release film layer 3 which are stacked in sequence; the first release film layer is a single silicon release film with a thickness of 50 μm and a release force of 25 gf / 25 mm, the adhesive film layer has a thickness of 50 μm, and the second release film layer is a single silicon release film with a thickness of 30 μm and a release force of 5 gf / 25 mm.

[0095] The water-based tape is prepared by the following method: the pressure-sensitive adhesive liquid is evenly coated on the first release film layer using a coating machine with a scraper, and then the coated wet film is sent to a multi-stage oven for drying for 5 minutes to form a film layer, and the drying temperature of the multi-stage oven is specifically 60°C, 70°C, 85°C, 100°C, 110°C, 120°C, and 100°C, and then the second release film layer is attached to obtain the water-based tape.

[0096] Example 2

[0097] This embodiment provides an aqueous acrylic polymer emulsion and a preparation method thereof, a pressure-sensitive adhesive solution, and an aqueous tape. The difference between the aqueous acrylic polymer emulsion and the embodiment 1 is that the aqueous acrylic polymer emulsion comprises the following components in parts by weight: 50 parts of butyl acrylate, 25 parts of isooctyl acrylate, 12 parts of methyl methacrylate, 7 parts of acrylic acid, 3 parts of hydroxyethyl methacrylate, 1.2 parts of 2-(dodecylthiothiocarbonylthio)-2-methylpropionic acid, 3.5 parts of allyloxynonylphenol polyoxyethylene ether ammonium sulfate, 0.8 parts of sodium dodecylbenzene sulfonate, 0.5 parts of ammonium persulfate, 0.4 parts of sodium bicarbonate, and 110 parts of deionized water;

[0098] The pressure-sensitive adhesive solution comprises the following components by weight: 85 parts of the above-mentioned aqueous acrylic polymer emulsion, 12 parts of aqueous tackifying resin (terpene phenolic resin aqueous emulsion), 1.5 parts of wetting agent (acetylenic diol wetting agent), 0.4 parts of antioxidant (hindered phenol antioxidant) and 0.4 parts of defoaming agent (polyether modified silicone defoaming agent);

[0099] Other conditions are the same as in Example 1.

[0100] Example 3

[0101] This embodiment provides an aqueous acrylic polymer emulsion and a preparation method thereof, a pressure-sensitive adhesive solution, and an aqueous tape. The difference between the aqueous acrylic polymer emulsion and the embodiment 1 is that the aqueous acrylic polymer emulsion comprises the following components in parts by weight: 45 parts of butyl acrylate, 40 parts of isooctyl acrylate, 18 parts of methyl methacrylate, 7 parts of acrylic acid, 3 parts of hydroxyethyl methacrylate, 1.5 parts of 2-(dodecylthiocarbonylthio)-2-methylpropionic acid, 3.5 parts of allyloxynonylphenol polyoxyethylene ether ammonium sulfate, 1.0 part of sodium dodecylbenzene sulfonate, 0.5 parts of ammonium persulfate, 0.5 parts of sodium bicarbonate, and 100 parts of deionized water;

[0102] The pressure-sensitive adhesive solution comprises the following components by weight: 100 parts of the above-mentioned aqueous acrylate polymer emulsion, 18 parts of aqueous tackifying resin (terpene resin aqueous emulsion), 2 parts of wetting agent (polyether-modified polysiloxane wetting agent), 0.5 parts of antioxidant (hindered phenol antioxidant) and 0.4 parts of defoaming agent (polyether-modified silicone defoaming agent);

[0103] Other conditions are the same as in Example 1.

[0104] Example 4

[0105] This embodiment provides an aqueous acrylic polymer emulsion and a preparation method thereof, a pressure-sensitive adhesive solution, and an aqueous tape. The difference between the aqueous acrylic polymer emulsion and the embodiment 1 is that the aqueous acrylic polymer emulsion comprises the following components in parts by weight: 50 parts of butyl acrylate, 30 parts of isooctyl acrylate, 18 parts of methyl methacrylate, 7 parts of acrylic acid, 5 parts of hydroxyethyl methacrylate, 1.5 parts of 2-(dodecylthiocarbonylthio)-2-methylpropionic acid, 3.5 parts of allyloxynonylphenol polyoxyethylene ether ammonium sulfate, 1.5 parts of sodium dodecylbenzene sulfonate, 0.5 parts of ammonium persulfate, 0.6 parts of sodium bicarbonate, and 110 parts of deionized water;

[0106] The pressure-sensitive adhesive solution comprises the following components by weight: 85 parts of the above-mentioned aqueous acrylate polymer emulsion, 18 parts of aqueous tackifying resin (polyurethane-modified aqueous tackifying resin), 2 parts of wetting agent (polyether-modified polysiloxane wetting agent), 0.5 parts of antioxidant (hindered phenol antioxidant) and 0.4 parts of defoaming agent (polyether-modified silicone defoaming agent);

[0107] Other conditions are the same as in Example 1.

[0108] Example 5

[0109] This embodiment provides an aqueous acrylic polymer emulsion and a preparation method thereof, a pressure-sensitive adhesive solution, and an aqueous tape. The difference between the aqueous acrylic polymer emulsion and the embodiment 1 is that the aqueous acrylic polymer emulsion comprises the following components in parts by weight: 60 parts of butyl acrylate, 40 parts of isooctyl acrylate, 20 parts of methyl methacrylate, 8 parts of acrylic acid, 5 parts of hydroxyethyl methacrylate, 1.7 parts of 2-(dodecylthiothiocarbonylthio)-2-methylpropionic acid, 4 parts of allyloxynonylphenol polyoxyethylene ether ammonium sulfate, 1.5 parts of sodium dodecylbenzene sulfonate, 0.5 parts of ammonium persulfate, 0.6 parts of sodium bicarbonate, and 120 parts of deionized water;

[0110] The pressure-sensitive adhesive solution comprises the following components by weight: 85 parts of the above-mentioned aqueous acrylate polymer emulsion, 18 parts of aqueous tackifying resin (polyurethane-modified aqueous tackifying resin), 2 parts of wetting agent (polyether-modified polysiloxane wetting agent), 0.5 parts of antioxidant (hindered phenol antioxidant) and 0.4 parts of defoaming agent (polyether-modified silicone defoaming agent);

[0111] Other conditions are the same as in Example 1.

[0112] Example 6

[0113] This embodiment provides an aqueous acrylate polymer emulsion and a preparation method thereof, a pressure-sensitive adhesive solution, and an aqueous tape. The difference between the embodiment 1 and the embodiment 1 is that the step (3) is adjusted to heat the pre-emulsion obtained in the step (1) to 80° C., add part of the initiator solution obtained in the step (2) to initiate the reaction, and then drip the remaining initiator solution obtained in the step (2) to react, the dripping time is 3 hours, and after the dripping is completed, the heat preservation reaction is continued for 2 hours. After the reaction is completed, the pre-emulsion is cooled to 35° C., and sodium bicarbonate is added to obtain the aqueous acrylate polymer emulsion;

[0114] Taking the total mass of the initiator solution prepared in step (2) as 100%, the mass of the initiator solution prepared in step (2) of the above part is 10%.

[0115] Other conditions are the same as in Example 1.

[0116] Example 7

[0117] This embodiment provides an aqueous acrylate polymer emulsion and a preparation method thereof, a pressure-sensitive adhesive solution, and an aqueous tape. The only difference between this embodiment and Embodiment 1 is that 2-(dodecylthiocarbonylthio)-2-methylpropionic acid is replaced with 4-cyano-4-((dodecylthiocarbonyl)thio)pentanoic acid of the same mass, and other conditions are the same as those in Embodiment 1.

[0118] Example 8

[0119] This embodiment provides a water-based acrylic polymer emulsion and a preparation method thereof, a pressure-sensitive adhesive solution, and a water-based tape. The difference between this embodiment and Embodiment 1 is that methyl methacrylate is replaced with styrene of the same mass, and other conditions are the same as those of Embodiment 1.

[0120] Example 9

[0121] This embodiment provides a water-based acrylic polymer emulsion and a preparation method thereof, a pressure-sensitive adhesive solution, and a water-based tape. The only difference between this embodiment and Embodiment 1 is that butyl acrylate is replaced with ethyl acrylate of the same mass, and other conditions are the same as those of Embodiment 1.

[0122] Example 10

[0123] This embodiment provides an aqueous acrylate polymer emulsion and a preparation method thereof, a pressure-sensitive adhesive solution, and an aqueous tape. The difference between this embodiment and Embodiment 1 is that hydroxyethyl methacrylate is replaced with glycidyl methacrylate of the same mass, and other conditions are the same as those of Embodiment 1.

[0124] Embodiment 11

[0125] This embodiment provides a water-based acrylic polymer emulsion and a preparation method thereof, a pressure-sensitive adhesive solution, and a water-based tape. The difference between this embodiment and Embodiment 1 is that the weight portion of acrylic acid is adjusted to 2 parts, and other conditions are the same as those of Embodiment 1.

[0126] Example 12

[0127] This embodiment provides an aqueous acrylic polymer emulsion and a preparation method thereof, a pressure-sensitive adhesive solution, and an aqueous tape. The difference between this embodiment and Example 1 is that the weight fraction of the aqueous tackifying resin (terpene resin aqueous emulsion) in the pressure-sensitive adhesive solution is adjusted to 20 parts, and other conditions are the same as those in Example 1.

[0128] Embodiment 13

[0129] This embodiment provides a water-based acrylic polymer emulsion and a preparation method thereof, a pressure-sensitive adhesive solution, and a water-based tape. The only difference between this embodiment and Embodiment 1 is that no antioxidant is added to the pressure-sensitive adhesive solution, and other conditions are the same as those of Embodiment 1.

[0130] Comparative Example 1

[0131] This comparative example provides an aqueous acrylate polymer emulsion and a preparation method thereof, a pressure-sensitive adhesive solution, and an aqueous tape. The difference between the comparative example and Example 1 is that the raw materials for preparing the aqueous acrylate polymer emulsion do not include allyloxynonylphenol polyoxyethylene ether ammonium sulfate, and other conditions are the same as those in Example 1.

[0132] Comparative Example 2

[0133] This comparative example provides an aqueous acrylate polymer emulsion and a preparation method thereof, a pressure-sensitive adhesive solution, and an aqueous tape. The difference between the comparative example and Example 1 is that the raw materials for preparing the aqueous acrylate polymer emulsion do not include sodium bicarbonate, and other conditions are the same as those in Example 1.

[0134] Comparative Example 3

[0135] This comparative example provides an aqueous acrylate polymer emulsion and a preparation method thereof, a pressure-sensitive adhesive solution, and an aqueous tape. The difference between the comparative example and Example 1 is that the raw materials for preparing the aqueous acrylate polymer emulsion do not include 2-(dodecylthiothiocarbonylthio)-2-methylpropionic acid, and other conditions are the same as those in Example 1.

[0136] Comparative Example 4

[0137] This comparative example provides an aqueous acrylate polymer emulsion and a preparation method thereof, a pressure-sensitive adhesive solution, and an aqueous tape. The difference between the comparative example and Example 1 is that no aqueous tackifying resin (terpene resin aqueous emulsion) is added to the pressure-sensitive adhesive solution, and other conditions are the same as those in Example 1.

[0138] Comparative Example 5

[0139] This comparative example provides an aqueous acrylate polymer emulsion and a preparation method thereof, a pressure-sensitive adhesive solution, and a water-based tape. The difference between the comparative example and Example 1 is that no wetting agent (polyether-modified polysiloxane wetting agent) is added to the pressure-sensitive adhesive solution, and other conditions are the same as those in Example 1.

[0140] Comparative Example 6

[0141] This comparative example provides an aqueous acrylic polymer emulsion and a preparation method thereof, a pressure-sensitive adhesive solution, and a water-based tape. The difference between the comparative example and Example 1 is that no defoaming agent (polyether-modified silicone defoaming agent) is added to the pressure-sensitive adhesive solution, and other conditions are the same as those in Example 1.

[0142] Comparative Example 7

[0143] This comparative example provides an aqueous acrylate polymer emulsion and a preparation method thereof, a pressure-sensitive adhesive solution, and an aqueous tape. The difference between the aqueous acrylate polymer emulsion and the comparative example 1 is that 2-(dodecylthiothiocarbonylthio)-2-methylpropionic acid is replaced with bis(thiobenzoyl) disulfide of the same mass, and the other conditions are the same as those in Example 1.

[0144] The water-based tapes provided in the above-mentioned Examples 1 to 13 and Comparative Examples 1 to 7 were tested, and the specific testing method is as follows:

[0145] (1) 180° peel strength: The test was conducted in accordance with GB / T 2792-2014 “Test method for peel strength of adhesive tapes” using a peel force tensile testing machine. The test specimen used was a 25 mm wide water-based tape with a single silicone release film removed. One side was reinforced with a 25 μm thick PET film as the backing. The peel rate was 300 mm / min.

[0146] (2) Initial tack: The initial tack of the tape was tested in accordance with the standard GB / T 31125-2014 “Test method for initial tack of adhesive tapes - Ring method”.

[0147] (3) Adhesion: According to GB / T 4851-2014, the sample (a 25 mm wide water-based tape with a single silicone release film removed and a 25 μm PET film on one side for reinforcement) was vertically hung on a test frame and a 500 g weight was hung at 85°C. The time it took for the adhered sample to completely detach was tested. If it was not completely detached after 240 h, it was recorded as >240 h.

[0148] (4) VOC content: The test is conducted in accordance with ISO 12219-2-2012 “Interior air of road vehicles - Part 2: Screening method for determination of volatile organic compound emissions from automotive interior components and materials - Bag method”.

[0149] (5) Water resistance: The sample (the single silicon release film of the water-based tape was removed and one side was reinforced with a 25 μm PET film on the back) was attached to a SUS304 steel plate and immersed in 40°C water for 168 h. It was then taken out and allowed to stand and dry. The appearance was observed and the 180° peel strength was tested.

[0150] (6) Aging performance test: After accelerated aging tests at high temperature and high humidity, high temperature and low temperature, observe the appearance and test the 180° peel strength;

[0151] The test conditions for high temperature and high humidity aging are 60°C, 90% RH, and 168h; the test conditions for high temperature aging are 80°C, 226h; and the test conditions for low temperature aging are -40°C, 48h.

[0152] (7) Odor level: Take a 100mm×200mm water-based tape and put it into an odorless glass jar (put the jar in an 80℃ oven for 1h for aging before testing), then place it at a high temperature of 80±2℃ for 2h, take it out and cool it to 60℃, and then evaluate the odor. Five professional odor testers will evaluate the odor, and finally take the average of the evaluation values ​​of the five testers as the test odor level. The odor is divided into 6 levels, 1 is no odor, 2 is a slight odor, 3 is a smell but not irritating, 4 is a pungent odor, 5 is a strong irritating odor, and 6 is an unbearable smell.

[0153] The test results are shown in Tables 1 and 2 below:

[0154] Table 1

[0155]

[0156]

[0157] In Table 1, “ / ” means that the test was not performed, and “ND” means that the result was not detected or was below the detection limit of the method.

[0158] Table 2

[0159]

[0160]

[0161] In Table 2, “ / ” means that the test was not performed, and “ND” means that the result was not detected or was lower than the detection limit of the method.

[0162] It can be seen from the contents of Table 1 and Table 2 that the water-based tapes provided by Examples 1 to 13 have a 180° peel strength ≥17 N / 25 mm, an initial adhesion ≥15 N / 25 mm, a low VOC content, good water resistance and aging resistance, and low odor and are non-irritating.

[0163] Compared with Example 1, if all the pre-emulsion is directly mixed with the initiator solution (Example 6), the emulsion polymerization reaction starts slowly, the polymerization time becomes longer, and the adhesive performance of the prepared water-based tape is slightly reduced.

[0164] Compared with Example 1, if the RAFT chain transfer agent 2-(dodecylthiocarbonylthio)-2-methylpropionic acid is replaced with the same mass of 4-cyano-4-((dodecylthiocarbonyl)thio)pentanoic acid (Example 7), it has little effect on the water-based acrylic polymer emulsion and the water-based tape.

[0165] Compared with Example 1, if butyl acrylate is replaced with ethyl acrylate of the same mass (Example 9), the adhesive performance of the prepared water-based tape decreases.

[0166] Compared with Example 1, if hydroxyethyl methacrylate is replaced with glycidyl methacrylate of the same mass (Example 10), the adhesive performance of the obtained water-based adhesive tape is reduced.

[0167] Compared with Example 1, if the weight percentage of acrylic acid is lower (Example 11), the adhesive performance of the prepared water-based tape decreases, and the water resistance and aging resistance decrease.

[0168] Compared with Example 1, if the weight fraction of the aqueous tackifying resin is higher (Example 12) ， Compared with Example 1, if no antioxidant is added to the pressure-sensitive adhesive solution (Example 13), the prepared water-based tape turns yellow during high-temperature and high-humidity aging and high-temperature aging, and has poor aging resistance.

[0169] Compared with Example 1, if the raw materials for preparing the aqueous acrylate polymer emulsion do not include a reactive emulsifier (Comparative Example 1), the polymerization reaction effect during the preparation of the aqueous acrylate polymer emulsion is poor, and the prepared aqueous acrylate polymer emulsion is in a stratified state.

[0170] Compared with Example 1, if the raw materials for preparing the aqueous acrylic polymer emulsion do not include a pH stabilizer (Comparative Example 2), the polymerization reaction effect during the preparation of the aqueous acrylic polymer emulsion is poor, and gel agglomeration occurs in the prepared aqueous acrylic polymer emulsion.

[0171] Compared with Example 1, if the raw materials for preparing the aqueous acrylic polymer emulsion do not include a RAFT chain transfer agent (Comparative Example 3), the polymerization reaction effect during the preparation of the aqueous acrylic polymer emulsion is poor, the prepared aqueous acrylic polymer emulsion contains more precipitates, the system is unstable, and the prepared aqueous tape has poor adhesive properties and poor adhesion.

[0172] Compared with Example 1, if no water-based tackifying resin is added to the pressure-sensitive adhesive solution (Comparative Example 4), the bonding performance of the prepared water-based tape is relatively low.

[0173] Compared with Example 1, if the wetting agent is not added to the pressure-sensitive adhesive solution (Comparative Example 5), during the preparation of the water-based adhesive tape, the formed adhesive film layer formed by coating shrinks and has cavities, and the coating effect is poor.

[0174] Compared with Example 1, if the defoamer is not added to the pressure-sensitive adhesive solution (Comparative Example 6), in the preparation process of the water-based adhesive tape, the formed adhesive film layer contains bubbles, and the adhesive shrinkage cavities appear, resulting in poor coating effect.

[0175] Compared with Example 1, if 2-(dodecylthiothiocarbonylthio)-2-methylpropionic acid is replaced with the same mass of bis(thiobenzoyl) disulfide (Comparative Example 7), the stability of the obtained aqueous acrylate polymer emulsion becomes poor, and the obtained aqueous acrylate polymer emulsion produces precipitation and stratification.

[0176] The applicant declares that the present invention illustrates the process method of the present invention through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned process steps, that is, it does not mean that the present invention must rely on the above-mentioned process steps to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of the raw materials selected by the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. An aqueous acrylic polymer emulsion, characterized in that The aqueous acrylic polymer emulsion comprises the following components by weight: 70-100 parts of soft monomers, 10-20 parts of hard monomers, 3-13 parts of functional monomers, 0.2-1.7 parts of RAFT chain transfer agents, 0.1-6 parts of emulsifiers, 0.2-0.6 parts of initiators, 0.1-0.6 parts of pH stabilizers and 80-150 parts of water; The RAFT chain transfer agent includes a carboxyl-containing trithiocarbonate chain transfer agent; and the emulsifier includes a reactive emulsifier and a non-reactive emulsifier.

2. The aqueous acrylate polymer emulsion according to claim 1, characterized in that The soft monomer includes any one of butyl acrylate, isooctyl acrylate, ethyl acrylate or lauryl acrylate or a combination of at least two thereof, and is more preferably butyl acrylate and isooctyl acrylate; Preferably, the hard monomer includes any one or a combination of at least two of methyl methacrylate, isobornyl methacrylate, styrene or isobornyl acrylate, and more preferably methyl methacrylate; Preferably, the functional monomer includes any one of acrylic acid, hydroxyethyl methacrylate or glycidyl methacrylate or a combination of at least two thereof, more preferably acrylic acid and hydroxyethyl methacrylate; Preferably, the carboxyl-containing trithiocarbonate chain transfer agent comprises 2-(dodecylthiocarbonylthio)-2-methylpropionic acid and / or 4-cyano-4-((dodecylthiocarbonyl)thio)pentanoic acid; Preferably, the reactive emulsifier includes allyloxy nonylphenol polyoxyethylene ether ammonium sulfate and / or maleic anhydride reactive emulsifier; Preferably, the non-reactive emulsifier comprises an anionic emulsifier and / or a nonionic emulsifier; Preferably, the anionic emulsifier comprises sodium dodecylbenzenesulfonic acid and / or sodium alkyl sulfosuccinate; Preferably, the nonionic emulsifier comprises an alkyl polyglycoside; Preferably, the initiator comprises ammonium persulfate and / or potassium persulfate; Preferably, the pH stabilizer comprises any one or a combination of at least two of sodium bicarbonate, triethanolamine or sodium citrate; Preferably, the water comprises deionized water.

3. The aqueous acrylate polymer emulsion according to claim 1 or 2, characterized in that: The aqueous acrylic polymer emulsion comprises the following components in parts by weight: 35-60 parts of butyl acrylate, 25-40 parts of isooctyl acrylate, 10-20 parts of methyl methacrylate, 2-8 parts of acrylic acid, 1-5 parts of hydroxyethyl methacrylate, 0.5-1.7 parts of 2-(dodecylthiothiocarbonylthio)-2-methylpropionic acid, 2-4 parts of reactive emulsifier, 0.5-1.5 parts of non-reactive emulsifier, 0.2-0.6 parts of initiator, 0.1-0.6 parts of pH stabilizer and 80-150 parts of water.

4. A method for preparing the aqueous acrylic polymer emulsion according to any one of claims 1 to 3, characterized in that: The preparation method comprises the following steps: (1) mixing part of water, emulsifier, RAFT chain transfer agent, soft monomer, hard monomer, and functional monomer to obtain a pre-emulsion; (2) mixing the remaining water and the initiator to obtain an initiator solution; (3) mixing the pre-emulsion obtained in step (1) and the initiator solution obtained in step (2), reacting them, and adding a pH stabilizer to obtain the aqueous acrylate polymer emulsion; Wherein, step (1) and step (2) are performed in no particular order, or are performed simultaneously.

5. The preparation method according to claim 4, characterized in that: Taking the total mass of water as 100%, the mass of the water in the part is 50% to 60%; Preferably, step (1) specifically comprises the following steps: uniformly mixing a portion of water and an emulsifier, adding a RAFT chain transfer agent, stirring and mixing, and then dropwise adding a mixed solution of a soft monomer, a hard monomer and a functional monomer for pre-emulsification to obtain a pre-emulsion; Preferably, the pre-emulsification is carried out under stirring, the stirring speed is 300-600 r / min, and the time is 30-60 min.

6. The preparation method according to claim 4 or 5, characterized in that: The step (3) specifically comprises the following steps: heating the pre-emulsion obtained in the step (1) to 70-85° C., adding part of the initiator solution obtained in the step (2) to initiate the reaction, and then dripping the remaining initiator solution obtained in the step (2) to react, the dripping time being 2-4 hours, and after the dripping is completed, continuing the heat preservation reaction for 1-2 hours, cooling to ≤40° C., and adding a pH stabilizer to adjust the pH to obtain the aqueous acrylate polymer emulsion; Preferably, based on the total mass of the initiator solution prepared in step (2) being 100%, the mass of the initiator solution prepared in the part of step (2) is 8% to 13%; Preferably, the pH is adjusted to 7-9.

7. The preparation method according to claim 4 or 5, characterized in that: The step (3) specifically comprises the following steps: heating part of the pre-emulsion obtained in the step (1) to 70-85° C., adding part of the initiator solution obtained in the step (2) to initiate the reaction, and then simultaneously dripping the remaining initiator solution obtained in the step (2) and the remaining pre-emulsion obtained in the step (1) to react, the dripping time being 2-4 hours, and continuing to keep the temperature for 1-2 hours after the dripping is completed, cooling to ≤40° C., and adding a pH stabilizer to adjust the pH to obtain the aqueous acrylate polymer emulsion; Preferably, based on the total mass of the pre-emulsion prepared in step (1) being 100%, the mass of the pre-emulsion prepared in step (1) is 25% to 35%; Preferably, based on the total mass of the initiator solution prepared in step (2) being 100%, the mass of the initiator solution prepared in step (2) is 3% to 8%; Preferably, the pH is adjusted to 7-9.

8. A pressure-sensitive adhesive solution, characterized in that: The pressure-sensitive adhesive solution comprises the aqueous acrylate polymer emulsion according to any one of claims 1 to 3, an aqueous tackifying resin, a wetting agent and a defoaming agent; Preferably, the pressure-sensitive adhesive solution further includes an antioxidant; Preferably, the pressure-sensitive adhesive solution comprises the following components in parts by weight: 80-100 parts of the aqueous acrylic polymer emulsion according to any one of claims 1 to 3, 5-20 parts of an aqueous tackifying resin, 0.5-2 parts of a wetting agent, 0.1-0.5 parts of an antioxidant and 0.1-0.5 parts of a defoaming agent; Preferably, the water-based tackifying resin comprises any one or a combination of at least two of natural rosin, rosin derivatives, terpene resins, terpene phenolic resins, polyurethane-modified water-based tackifying resins, dicyclopentadiene resins, maleic anhydride-modified petroleum resins or alkylphenolic resins; Preferably, the rosin derivative comprises rosin ester; Preferably, the wetting agent includes any one or a combination of at least two of a polyether-modified polysiloxane wetting agent, an acetylene glycol wetting agent, a polyether phosphate wetting agent or a non-silicon and non-fluorine high-activity surfactant; Preferably, the antioxidant comprises a hindered phenol antioxidant; Preferably, the defoaming agent comprises a polyether-modified silicone defoaming agent.

9. A method for preparing a pressure-sensitive adhesive solution as claimed in claim 8, characterized in that: The preparation method comprises the following steps: mixing an aqueous acrylic polymer emulsion, an aqueous tackifying resin, a wetting agent, an antioxidant and a defoaming agent to obtain the pressure-sensitive adhesive solution; Preferably, the preparation method specifically comprises the following steps: (a) mixing an antioxidant and a portion of the aqueous acrylate polymer emulsion to obtain a first mixed solution; (b) mixing the first mixed solution obtained in step (a), the tackifying resin and the remaining aqueous acrylic polymer emulsion to obtain a second mixed solution; (c) mixing the second mixed solution obtained in step (b) with a wetting agent, and then adding a defoaming agent to mix, thereby obtaining the pressure-sensitive adhesive solution; Preferably, based on the total mass of the aqueous acrylate polymer emulsion being 100%, the mass of the aqueous acrylate polymer emulsion of the part is 10% to 13%; Preferably, the mixing in step (b) is performed at a stirring speed of 400 to 500 rpm for 10 to 15 min; Preferably, the adding of the defoaming agent and mixing in step (c) specifically comprises adding the defoaming agent dropwise at a stirring speed of 500 to 600 rpm, and then continuing stirring for 30 to 40 min; Preferably, step (c) further comprises the steps of standing and filtering after adding the defoaming agent and mixing.

10. A water-based tape, characterized in that: The water-based adhesive tape comprises an adhesive film layer prepared from the pressure-sensitive adhesive solution as claimed in claim 8; Preferably, the water-based adhesive tape comprises a first release film layer, an adhesive film layer and a second release film layer; Preferably, the thickness of the adhesive film layer is 25-100 μm.

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