High-weather-resistance low-residual water-based pressure-sensitive latex emulsion, synthesis method and application thereof

Abstract

This invention relates to the field of pressure-sensitive adhesive technology, and proposes a high-weather-resistant, low-residue water-based pressure-sensitive adhesive emulsion, its synthesis method, and its application. A high-weather-resistant, low-residue water-based pressure-sensitive adhesive emulsion comprises a core-shell type water-based acrylate emulsion, a functionally modified monomer pre-emulsion, additive A, additive B, and a crosslinking agent. The core layer of the core-shell type water-based acrylate emulsion comprises the following components: n-butyl acrylate, 2-ethylhexyl acrylate, methacrylic acid, hydroxybutyl methacrylate, emulsifier A, initiator A, and electronic-grade deionized water. The shell layer of the core-shell type water-based acrylate emulsion comprises the following components: methyl acrylate, 2-ethylhexyl acrylate, methacrylic acid, emulsifier B, initiator B, and electronic-grade deionized water. This technical solution solves the problem of insufficient aging resistance in related technologies of water-based pressure-sensitive adhesive emulsions.

Description

Technical Field

[0001] This invention relates to the field of pressure-sensitive adhesive technology, specifically to a high weather-resistant, low-residue water-based pressure-sensitive adhesive emulsion, its synthesis method, and its application. Background Technology

[0002] Pressure-sensitive adhesives achieve bonding with minimal pressure, requiring no additional heating or solvent curing, and are widely used in electronics, coating, and bonding industries. Traditional flexible electronic pressure-sensitive adhesives are mostly solvent-based acrylate systems containing organic solvents, which present problems such as high VOC emissions, flammability and explosiveness, poor safety in production and use environments, potential corrosion of flexible optical substrates by some solvents, and residual solvents affecting the stability of electronic circuits. These issues no longer meet the environmental protection and safety production control requirements of the electronics industry.

[0003] Existing commercially available general-purpose water-based pressure-sensitive adhesives have several shortcomings when applied to the emerging field of flexible electronics. Firstly, they suffer from insufficient bending resistance and elasticity. Conventional water-based emulsion adhesive films are relatively hard with low elastic recovery rates, easily leading to adhesive layer breakage, delamination, and edge lifting after tens of thousands of bends and twists, failing to meet the dynamic deformation requirements of flexible screens and wearable devices. Secondly, they exhibit poor high and low temperature weather resistance. The adhesive layer has a narrow glass transition temperature range, easily experiencing soft slippage at high temperatures and embrittlement at low temperatures, resulting in a significant decrease in adhesive strength, making them unsuitable for the wide-temperature application scenarios of automotive and outdoor wearable devices. Furthermore, they also have… The problem of residual adhesive is prominent. The cohesion of the emulsion system is difficult to control, and the adhesive layer is easily torn and left behind during module disassembly and repair, which contaminates the optical surface and precision circuits, causing the device to be scrapped. On the other hand, there is the problem of poor optical performance. Ordinary water-based emulsions have a wide particle size distribution, high film haze and low light transmittance. They are prone to yellowing under long-term light exposure and high temperature environment, making them unsuitable for high-definition flexible displays and optical sensors. Finally, there is the problem of weak wetting and spreading properties. The surface tension of water-based systems is high, resulting in poor wetting on low surface energy electronic substrates such as PI, PET and flexible glass, which easily leads to pinholes and uneven adhesion, affecting the bonding yield.

[0004] Therefore, it is necessary to develop a pressure-sensitive adhesive latex to solve or alleviate the above problems. Summary of the Invention

[0005] This invention proposes a high weather-resistant, low-residue water-based pressure-sensitive adhesive latex, its synthesis method, and its application, in order to solve or alleviate at least one of the above-mentioned problems.

[0006] The technical solution of the present invention is as follows: This invention proposes a high-weather-resistant, low-residue waterborne pressure-sensitive adhesive latex, comprising a core-shell waterborne acrylic emulsion, a functionally modified monomer pre-emulsion, additives, and a crosslinking agent. The core layer of the core-shell waterborne acrylic emulsion comprises the following raw materials in parts by weight: 150-155 parts of n-butyl acrylate, acrylic acid... 2 230-235 parts ethylhexyl ester, 1-3 parts methacrylic acid, 6-10 parts hydroxybutyl methacrylate, 8-9 parts emulsifier A, 16-20 parts initiator A, and 80-85 parts electronic grade deionized water; The shell layer of the core-shell type aqueous acrylic emulsion comprises the following components in parts by weight: 90-100 parts methyl acrylate, acrylic acid... 2 6-8 parts ethylhexyl ester, 1-3 parts methacrylic acid, 1-1.5 parts emulsifier B, 6-7 parts initiator B, and 40-50 parts electronic-grade deionized water.

[0007] Preferably, the functional modified monomer preemulsion comprises the following components in parts by weight: 10-15 parts of fluorinated modified acrylate monomer, 25-30 parts of hydroxyethyl acrylate, 10-15 parts of hydroxypropyl acrylate, 0.5-1 part of emulsifier B, 2-3 parts of initiator C, and 20-25 parts of electronic grade deionized water.

[0008] Preferably, emulsifier A is composed of a nonionic emulsifier and a reactive emulsifier in a mass ratio of 1.3~1.5:6.5~7; and emulsifier B is a reactive emulsifier.

[0009] Preferably, initiator A is composed of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 0.8~0.9:17~18, initiator B is composed of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 0.2~0.25:6~6.5, and initiator C is composed of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 0.1~0.12:2~2.2.

[0010] Preferably, the fluorinated modified acrylate monomer includes one or more of trifluoroethyl acrylate, tetrafluoropropyl acrylate, hexafluorobutyl acrylate, and octafluoropentyl acrylate.

[0011] Preferably, the amount of the additive is 20-25 parts, and the additive is composed of a composite weather-resistant stabilizer and an organosilicon leveling agent BYK-333 in a mass ratio of 12:8-9. The composite weather-resistant stabilizer is composed of an absorbent UV-540W and an antioxidant 1010 in a mass ratio of 1:1.2-1.3. The amount of additive B is 2-3 parts, and additive B is composed of an defoamer and a bactericide in a mass ratio of 0.5-0.6:2.

[0012] This invention also proposes a method for preparing a high-weather-resistant, low-residue water-based pressure-sensitive adhesive latex, comprising the following steps: S1. Preparation of nuclear pre-emulsion: The emulsifier A in the core layer raw material is mixed with the electronic grade deionized water, the remaining core layer raw material is added, and after stirring and emulsifying, a nuclear pre-emulsion is obtained. S2. Preparation of shell pre-emulsion: The emulsifier B in the shell raw material is mixed with the electronic grade deionized water, the remaining shell raw material is added, and after stirring and emulsifying, the shell pre-emulsion is obtained. S3. Preparation of functional modified monomer preemulsion: The emulsifier B in the functional modified monomer preemulsion raw material is mixed with the electronic grade deionized water, and the remaining functional modified monomer preemulsion raw material is added. After stirring and emulsifying, the functional modified monomer preemulsion is obtained. S4. Polymerization: Mix electronic-grade deionized water and emulsifier C, heat to 75-78°C, add 4wt%-4.5wt% of the core pre-emulsion and initiator D, react for 15-20 min, maintain the temperature at 74-76°C, and simultaneously add the remaining core pre-emulsion and initiator A; after the addition is complete, simultaneously add the shell pre-emulsion and initiator B, and then simultaneously add the functional modified monomer pre-emulsion and initiator C; after the addition is complete, heat to 83-85°C and maintain the temperature for 50-60 min, cool to below 40°C, add the auxiliary agent A, stir for 20-30 min, add the aqueous crosslinking agent, stir at a constant temperature for 30-40 min, adjust the pH to 7.5-8.5, add the auxiliary agent B, stir evenly, and filter to obtain the high weather-resistant, low-residue aqueous pressure-sensitive latex.

[0013] Preferably, in step S4, during the polymerization process, the amount of electronic-grade deionized water added for polymerization is 190-200 parts, the amount of emulsifier C added is 3-5 parts, the amount of initiator D added is 15-20 parts, and the aqueous crosslinking agent is an aqueous aziridine crosslinking agent.

[0014] Preferably, the emulsifier C is composed of a reactive emulsifier and an anionic surfactant in a mass ratio of 1.3 to 1.5:2, and the initiator D is composed of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 1.2 to 1.3:15.

[0015] The present invention also proposes the application of a high weather-resistant, low residual water-based pressure-sensitive adhesive latex, or the preparation method of the high weather-resistant, low residual water-based pressure-sensitive adhesive latex, in the field of flexible electronics.

[0016] The working principle and beneficial effects of this invention are as follows: 1. In this invention, the core layer of the core-shell waterborne acrylic emulsion uses a high proportion of 2-ethylhexyl acrylate and butyl acrylate as the core soft monomer. Relying on the low homopolymer glass transition temperature and long flexible alkyl chain structure of 2-ethylhexyl acrylate, the core layer possesses low-temperature flexibility and deformation resilience, enabling it to remain non-brittle at -30°C and withstand tens of thousands of repeated bends without fatigue cracking. This improves the product's low-temperature weather resistance and effectively solves the problems of low-temperature embrittlement and bending failure in traditional pressure-sensitive adhesives. The shell layer uses a monomer combination of low-dosage 2-ethylhexyl acrylate and high-rigidity methyl acrylate, which differs from the high soft monomer ratio of the core layer. A small amount of 2-ethylhexyl acrylate can moderately buffer the rigidity of the hard shell and avoid the lack of flexibility caused by an overly hard shell, ensuring high strength of the shell while retaining the ability to adapt to deformation; a high proportion of methyl acrylate constructs a highly cohesive and rigid shell structure, effectively constraining the high-temperature creep deformation of the soft core, achieving no flow, no displacement, and no residual adhesive overflow of the adhesive film at 85℃, thus improving high-temperature weather resistance; by adjusting the amount of 2-ethylhexyl acrylate in both the core and shell layers, the low-temperature toughness and high-temperature cohesive performance are balanced, allowing the pressure-sensitive adhesive emulsion to maintain stable adhesive and mechanical properties under alternating high and low temperatures, long-term outdoor conditions, and harsh working conditions, thereby improving the overall weather resistance of the pressure-sensitive adhesive.

[0017] 2. It replaces traditional solvent-based formulations, contains no volatile organic solvents, has extremely low VOC content, is safe and explosion-proof during production and use, does not corrode flexible optical substrates and precision circuits, and meets the environmental protection standards of the electronics industry. Detailed Implementation

[0018] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0019] A specific embodiment of the first aspect of the present invention provides a high weather-resistant, low-residue waterborne pressure-sensitive adhesive latex, comprising a core-shell type waterborne acrylic emulsion, a functionally modified monomer pre-emulsion, additives, and a crosslinking agent. The core layer of the core-shell type waterborne acrylic emulsion comprises the following components in parts by weight: 150-155 parts of n-butyl acrylate, acrylic acid... 2 230-235 parts ethylhexyl ester, 1-3 parts methacrylic acid, 6-10 parts hydroxybutyl methacrylate, 8-9 parts emulsifier A, 16-20 parts initiator A, and 80-85 parts electronic grade deionized water; The shell layer of the core-shell type aqueous acrylic emulsion comprises the following components by weight: 90-100 parts methyl acrylate, acrylic acid... 2 6-8 parts ethylhexyl ester, 1-3 parts methacrylic acid, 1-1.5 parts emulsifier B, 6-7 parts initiator B, and 40-50 parts electronic-grade deionized water.

[0020] In this invention, a core-shell type waterborne acrylic emulsion is prepared using a core-shell structure with a soft core and a hard shell. The overall glass transition temperature of the emulsion is adjusted by differentiating the ratio of the monomers in the core and shell layers, achieving a balance between high elasticity and high cohesion of the film. This effectively solves the industry problems of performance degradation and poor adaptability of traditional waterborne pressure-sensitive adhesives under alternating hot and cold environments.

[0021] In this invention, electronic-grade deionized water with a conductivity of ≤1μS / cm is used to avoid ionic impurities affecting precision electronic circuits.

[0022] In one embodiment of the present invention, the functional modified monomer preemulsion comprises the following components in parts by weight: 10-15 parts of fluorinated modified acrylate monomer, 25-30 parts of hydroxyethyl acrylate, 10-15 parts of hydroxypropyl acrylate, 0.5-1 part of emulsifier B, 2-3 parts of initiator C, and 20-25 parts of electronic grade deionized water.

[0023] In this invention, hydroxybutyl methacrylate hydroxy monomers are introduced into the core layer, while no additional hydroxy monomers are added to the shell layer. This avoids excessive enrichment of hydroxyl groups in the shell layer, which could lead to an overly hard surface and reduced flexibility of the film. Simultaneously, it ensures that the core layer segments possess adequate crosslinking potential, maintaining the high elasticity and bending resistance of the core, and guaranteeing that the mechanical properties do not degrade under low-temperature conditions. Furthermore, hydroxyethyl acrylate and hydroxypropyl acrylate are compounded in the functional modified monomer pre-emulsion. More preferably, the mass ratio of hydroxyethyl acrylate to hydroxypropyl acrylate is 2:1, forming different levels and types of hydroxyl groups with the hydroxybutyl methacrylate in the core layer. This creates a uniform and dense crosslinking network within and at the interface of the film, improving the overall structural stability of the film and effectively suppressing problems such as cracking, deformation, and performance degradation under alternating hot and cold environments, thus enhancing the wide-temperature weather resistance of the pressure-sensitive adhesive latex.

[0024] In this invention, the functional modification system employs a compound of hydroxyl acrylate monomers and fluorinated modified acrylate monomers. The multi-hydroxyl monomers effectively enhance the interfacial adhesion between the adhesive film and various flexible substrates such as PET, PI, TPU, and flexible glass, preventing delamination and edge lifting during long-term use. Combined with the low surface energy of the fluorinated modified acrylate monomers, the surface adhesion of the adhesive film is reduced, achieving a residue-free and trace-free peeling effect. Furthermore, the fluorinated monomers possess excellent UV resistance, oxidation resistance, and yellowing resistance, effectively blocking external photo-oxidative aging and inhibiting aging defects such as yellowing, brittleness, and decreased cohesion during long-term use. This complements the layered hydroxyl-modified structure, further enhancing the pressure-sensitive adhesive's aging resistance, yellowing resistance, low residue weather resistance, and extending its service life under harsh outdoor and high / low temperature alternating conditions while retaining the high elasticity, high cohesion, resistance to repeated bending, and wide temperature stability of the core-shell structure.

[0025] In one embodiment of the present invention, emulsifier A is composed of a nonionic emulsifier and a reactive emulsifier in a mass ratio of 1.3~1.5:6.5~7, and emulsifier B is a reactive emulsifier.

[0026] In this invention, emulsifier A is composed of a nonionic emulsifier and a reactive emulsifier, and emulsifier B is a reactive emulsifier. Compared with the defects of traditional small molecule emulsifiers that easily migrate to the upper and lower surfaces of the film after film formation, the emulsifier system used in this solution can effectively avoid the accumulation of emulsifier at the interface of optical substrates such as PET and PI, and eliminate the problems of film whitening, increased haze, and decreased light transmittance. It effectively ensures that the light transmittance of the film is ≥92% and the haze is <0.8, and avoids defects such as white spots and haze after high-temperature aging. It can perfectly adapt to high optical requirements such as flexible displays. At the same time, there are no free emulsifier impurities left, ensuring a clean and stable bonding interface.

[0027] In one embodiment of the present invention, initiator A is composed of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 0.8~0.9:17~18, initiator B is composed of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 0.2~0.25:6~6.5, and initiator C is composed of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 0.1~0.12:2~2.2.

[0028] In this invention, a water-soluble azo initiator is selected, which results in a mild reaction, few byproducts, and low impurity content in the polymerization system, ensuring high light transmittance of the film. The polymerization temperature is mild, decomposition is gradual, residues are few, and it does not yellow, meeting the high transparency requirements of flexible electronic optical adhesives.

[0029] In one embodiment of the present invention, the fluorinated modified acrylate monomer includes one or more of trifluoroethyl acrylate, tetrafluoropropyl acrylate, hexafluorobutyl acrylate, and octafluoropentyl acrylate, preferably trifluoroethyl acrylate or hexafluorobutyl acrylate.

[0030] In one embodiment of the present invention, the amount of additive added is 20-25 parts, and the additive is composed of a composite weather-resistant stabilizer and an organosilicon leveling agent BYK-333 in a mass ratio of 12:8-9. The composite weather-resistant stabilizer is composed of absorbent UV-540W and antioxidant 1010 in a mass ratio of 1:1.2-1.3. The amount of additive B added is 2-3 parts, and additive B is composed of defoamer and bactericide in a mass ratio of 0.5-0.6:2.

[0031] In this invention, the composite weather stabilizer consists of an absorbent and an antioxidant, which can inhibit the degradation and yellowing of the adhesive film caused by light, heat, and oxygen, and improve its long-term weather resistance outdoors. The silicone leveling agent BYK-333 reduces the surface tension of the system, eliminating coating pinholes and craters; at the same time, it regulates the interfacial forces of the adhesive layer, ensuring that the adhesive layer peels off completely without any localized adhesive residue.

[0032] A specific embodiment of the second aspect of the present invention provides a method for preparing a high weather-resistant, low-residue water-based pressure-sensitive adhesive latex, used to prepare the high weather-resistant, low-residue water-based pressure-sensitive adhesive latex provided in the specific embodiment of the first aspect of the present invention, comprising the following steps: S1. Preparation of nuclear pre-emulsion: Emulsifier A in the core layer raw material is mixed with electronic grade deionized water, the remaining core layer raw material is added, and after stirring and emulsification, the nuclear pre-emulsion is obtained. S2. Preparation of shell pre-emulsion: Emulsifier B in the shell raw material is mixed with electronic grade deionized water, the remaining shell raw material is added, and after stirring and emulsifying, the shell pre-emulsion is obtained. S3. Preparation of functional modified monomer preemulsion: Emulsifier B in the functional modified monomer preemulsion raw material is mixed with electronic grade deionized water, and the remaining functional modified monomer preemulsion raw material is added. After stirring and emulsifying, functional modified monomer preemulsion is obtained. S4. Polymerization: Mix electronic-grade deionized water and emulsifier C, heat to 75-78℃, add 4wt%-4.5wt% of core pre-emulsion and initiator D, react for 15-20 min, maintain the temperature at 74-76℃, and simultaneously add the remaining core pre-emulsion and initiator A; after the addition is complete, simultaneously add the shell pre-emulsion and initiator B, and then simultaneously add the functional modified monomer pre-emulsion and initiator C; after the addition is complete, heat to 83-85℃ and maintain the temperature for 50-60 min, cool to below 40℃, add auxiliary agent A, stir for 20-30 min, add waterborne crosslinking agent, stir at constant temperature for 30-40 min, adjust the pH to 7.5-8.5, add auxiliary agent B, stir evenly, and filter to obtain a high weather-resistant, low-residue waterborne pressure-sensitive adhesive latex.

[0033] In one embodiment of the present invention, during the polymerization process, the amount of electronic-grade deionized water added for polymerization is 190-200 parts, the amount of emulsifier C added is 3-5 parts, the amount of initiator D added is 15-20 parts, and the aqueous crosslinking agent is an aqueous aziridine crosslinking agent.

[0034] In this invention, the amount of crosslinking agent added is 25-30 parts. The aqueous crosslinking agent is an aqueous aziridine crosslinking agent, which has good water phase compatibility. Three identical ternary aziridine heterocycles are connected to one molecular backbone. Each of the three rings can undergo ring-opening with the hydroxyl groups on three different acrylic polymer chains. One acrylic polymer chain carries multiple hydroxyl groups, which can simultaneously bind multiple crosslinking agent molecules. After a large number of bidirectional, multi-point connections, the linear acrylic emulsion molecules bridge each other to form a three-dimensional network crosslinked structure. During the film formation process at room temperature, a uniform three-dimensional network structure is formed, which can balance the adhesion and cohesion of the adhesive film, prevent high-temperature overflow and low-temperature brittleness, and further reduce the risk of peeling residue.

[0035] In this invention, ammonia is used to adjust the pH of the system to 7.5-8.5 to ensure the stability of the emulsion during storage and to prevent the emulsion from separating or breaking.

[0036] In one embodiment of the present invention, emulsifier C is composed of a reactive emulsifier and an anionic surfactant in a mass ratio of 1.3 to 1.5:2, and initiator D is composed of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 1.2 to 1.3:15.

[0037] A specific embodiment of the third aspect of the present invention provides a method for preparing a high weather-resistant, low residual water-based pressure-sensitive adhesive latex or a high weather-resistant, low residual water-based pressure-sensitive adhesive latex, and the application of the prepared high weather-resistant, low residual water-based pressure-sensitive adhesive latex in the field of flexible electronics.

[0038] In this invention, a ternary compound of reactive emulsifier, silicone leveling agent, and fluorinated functional monomer not only solves the defects of poor wetting and easy cratering in water-based systems, but also achieves strong adhesion and no residue after peeling, overcoming the industry pain point of residual adhesive pollution during precision electronics repair. With no small molecule emulsifier migration and a composite weather-resistant and stable system, the film has high light transmittance, low haze, and long-term resistance to yellowing, meeting the requirements for high-definition flexible displays and optical sensors. The entire process involves low-temperature aqueous phase reaction, resulting in a simple process with low energy consumption. It can be directly integrated into existing water-based coating production lines, and the product has good storage stability, making it suitable for large-scale industrial production.

[0039] The present invention will now be described in detail with reference to preferred embodiments and comparative examples. The preferred embodiments of the invention described below can be modified in various ways, and therefore the scope of the invention should not be construed as limited to the preferred embodiments described in detail below. Preferred embodiments are provided to help those skilled in the art to more readily understand the invention.

[0040] In the following examples and comparative examples: Nonionic emulsifier: Model ER-10; Reactive emulsifier: DNS-86; Anionic surfactant: Sodium 3-allyloxy-2-hydroxypropanesulfonate; Waterborne crosslinking agent: The waterborne aziridine crosslinking agent is model XR-100; Defoamer: Model 902W; Fungicide: Model BIT20.

[0041] Example 1 A high weather-resistant, low-residue waterborne pressure-sensitive adhesive latex comprises a core-shell type waterborne acrylic emulsion, a functionally modified monomer pre-emulsion, 20 parts of additive A, 2 parts of additive B, and 25 parts of crosslinking agent; Additive A consists of a composite weather-resistant stabilizer and an organosilicon leveling agent BYK-333 in a mass ratio of 12:8. The composite weather-resistant stabilizer consists of an absorber UV-540W and an antioxidant 1010 in a mass ratio of 1:1.2. Additive B consists of an antifoaming agent and a bactericide in a mass ratio of 0.5:2; The core layer of the core-shell type aqueous acrylic emulsion comprises the following components by weight: 150 parts n-butyl acrylate, acrylic acid... 2 230 parts ethylhexyl ester, 1 part methacrylic acid, 6 parts hydroxybutyl methacrylate, 8 parts emulsifier A, 16 parts initiator A, and 80 parts electronic grade deionized water; Emulsifier A consists of a nonionic emulsifier and a reactive emulsifier in a mass ratio of 1.3:6.5; Initiator A consists of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 0.8:17; The shell layer of the core-shell type aqueous acrylic emulsion comprises the following components in parts by weight: 90 parts methyl acrylate, acrylic acid... 2 6 parts ethylhexyl ester, 1 part methacrylic acid, 1 part emulsifier B, 6 parts initiator B, 40 parts electronic grade deionized water; Emulsifier B is a reactive emulsifier; Initiator B consists of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 0.2:6; The functional modified monomer preemulsion comprises the following components by weight: 10 parts trifluoroethyl acrylate, 25 parts hydroxyethyl acrylate, 10 parts hydroxypropyl acrylate, 0.5 parts emulsifier B, 2 parts initiator C, and 20 parts electronic-grade deionized water. Initiator C is composed of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 0.1:2; The polymerization process includes the following raw materials in parts by weight: 190 parts electronic-grade deionized water, 3 parts emulsifier C, and 15 parts initiator D; Emulsifier C is composed of a reactive emulsifier and an anionic surfactant in a mass ratio of 1.3:2; Initiator D consists of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 1.2:15; A method for preparing a high weather-resistant, low-residue water-based pressure-sensitive adhesive latex includes the following steps: S1. Preparation of nuclear pre-emulsion: Emulsifier A in the core layer raw material is mixed with electronic grade deionized water for 15 min, the remaining core layer raw material is added, and the mixture is stirred at high speed for 25 min to emulsify, thus obtaining the nuclear pre-emulsion; S2. Preparation of shell pre-emulsion: Emulsifier B in the shell raw material is mixed with electronic grade deionized water for 15 min, the remaining shell raw material is added, and the mixture is stirred at high speed for 25 min to emulsify, thus obtaining the shell pre-emulsion. S3. Preparation of functional modified monomer preemulsion: Emulsifier B in the functional modified monomer preemulsion raw material is mixed with electronic grade deionized water for 15 min, the remaining functional modified monomer preemulsion raw material is added, and after emulsification by high-speed stirring for 25 min, the functional modified monomer preemulsion is obtained. S4. Polymerization: Mix electronic-grade deionized water and emulsifier C, heat to 75°C, add 4 wt% of core pre-emulsion and initiator D, react for 15 min, maintain the temperature at 74°C, and simultaneously add the remaining core pre-emulsion and initiator A dropwise over 150 min; after the addition is complete, simultaneously add shell pre-emulsion and initiator B dropwise over 50 min; after the addition is complete, simultaneously add functional modified monomer pre-emulsion and initiator C dropwise over 35 min; after the addition is complete, heat to 83°C and maintain the temperature for 50 min, cool to below 40°C, add auxiliary agent A, stir for 20 min, slowly add aqueous crosslinking agent, stir at constant temperature for 30 min, adjust the pH to 7.5 with ammonia water, add auxiliary agent B, stir evenly, filter to remove a small amount of gel and impurities, and obtain a high weather-resistant, low-residue aqueous pressure-sensitive adhesive latex.

[0042] Example 2 A high weather-resistant, low-residue waterborne pressure-sensitive adhesive latex comprises a core-shell type waterborne acrylic emulsion, a functionally modified monomer pre-emulsion, 20.6 parts of additive A, 20.5 parts of additive B, and 26 parts of crosslinking agent; Additive A consists of a composite weathering stabilizer and an organosilicon leveling agent BYK-333 in a mass ratio of 12:8.6. The composite weathering stabilizer consists of an absorber UV-540W and an antioxidant 1010 in a mass ratio of 1:1.2. Additive B consists of an antifoaming agent and a bactericide in a mass ratio of 0.5:2; The core layer of the core-shell type aqueous acrylic emulsion comprises the following components by weight: 153 parts n-butyl acrylate, acrylic acid... 2 231 parts ethylhexyl ester, 2 parts methacrylic acid, 8 parts hydroxybutyl methacrylate, 8.2 parts emulsifier A, 18.06 parts initiator A, and 82.8 parts electronic grade deionized water; Emulsifier A consists of a nonionic emulsifier and a reactive emulsifier in a mass ratio of 1.3:6.9; Initiator A consists of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 0.86:17.2; The shell layer of the core-shell type aqueous acrylic emulsion comprises the following components by weight: 91 parts methyl acrylate, acrylic acid... 2 Ethylhexyl ester 6.7 parts, methacrylic acid 2.3 parts, emulsifier B 1.1 parts, initiator B 6.43 parts, electronic grade deionized water 45.4 parts; Emulsifier B is a reactive emulsifier; Initiator B consists of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 0.23:6.2; The functional modified monomer preemulsion comprises the following raw materials in parts by weight: 13 parts trifluoroethyl acrylate, 28 parts hydroxyethyl acrylate, 14 parts hydroxypropyl acrylate, 0.9 parts emulsifier B, 2.22 parts initiator C, and 21.9 parts electronic grade deionized water; Initiator C is composed of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 0.12:2.1; The polymerization process includes the following raw materials in parts by weight: 194.40 parts electronic-grade deionized water, 3.3 parts emulsifier C, and 16.2 parts initiator D; Emulsifier C is composed of a reactive emulsifier and an anionic surfactant in a mass ratio of 1.3:2; Initiator D consists of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 1.2:15; A method for preparing a high weather-resistant, low-residue water-based pressure-sensitive adhesive latex includes the following steps: S1. Preparation of nuclear pre-emulsion: Emulsifier A in the core layer raw material is mixed with electronic grade deionized water for 15 min, the remaining core layer raw material is added, and the mixture is stirred at high speed for 25 min to emulsify, thus obtaining the nuclear pre-emulsion; S2. Preparation of shell pre-emulsion: Emulsifier B in the shell raw material is mixed with electronic grade deionized water for 15 min, the remaining shell raw material is added, and the mixture is stirred at high speed for 25 min to emulsify, thus obtaining the shell pre-emulsion. S3. Preparation of functional modified monomer preemulsion: Emulsifier B in the functional modified monomer preemulsion raw material is mixed with electronic grade deionized water for 15 min, the remaining functional modified monomer preemulsion raw material is added, and after emulsification by high-speed stirring for 25 min, the functional modified monomer preemulsion is obtained. S4. Polymerization: Mix electronic-grade deionized water and emulsifier C, heat to 76°C, add 4.3 wt% of core pre-emulsion and initiator D, react for 18 min, maintain the temperature at 75°C, and simultaneously add the remaining core pre-emulsion and initiator A dropwise over 150 min; after the addition is complete, simultaneously add shell pre-emulsion and initiator B dropwise over 50 min; after the addition, simultaneously add functional modified monomer pre-emulsion and initiator C dropwise over 35 min; after the addition is complete, heat to 84°C and maintain the temperature for 50 min, cool to below 40°C, add auxiliary agent A, stir for 25 min, slowly add aqueous crosslinking agent, stir at constant temperature for 30 min, adjust the pH to 8 with ammonia, add auxiliary agent B, stir evenly, filter to remove a small amount of gel and impurities, and obtain a high weather-resistant, low-residue aqueous pressure-sensitive adhesive latex.

[0043] Example 3 A high weather-resistant, low-residue waterborne pressure-sensitive adhesive latex comprises a core-shell type waterborne acrylic emulsion, a functionally modified monomer pre-emulsion, 25 parts of additive A, 3 parts of additive B, and 30 parts of crosslinking agent; Additive A consists of a composite weather-resistant stabilizer and an organosilicon leveling agent BYK-333 in a mass ratio of 12:9. The composite weather-resistant stabilizer consists of absorber UV-540W and antioxidant 1010 in a mass ratio of 1:1.3. Additive B consists of an antifoaming agent and a bactericide in a mass ratio of 0.6:2; The core layer of the core-shell type aqueous acrylic emulsion comprises the following components by weight: 155 parts n-butyl acrylate, acrylic acid... 2 235 parts ethylhexyl ester, 3 parts methacrylic acid, 10 parts hydroxybutyl methacrylate, 9 parts emulsifier A, 20 parts initiator A, and 85 parts electronic-grade deionized water; Emulsifier A consists of a nonionic emulsifier and a reactive emulsifier in a mass ratio of 1.5:7; Initiator A consists of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 0.9:18; The shell layer of the core-shell type aqueous acrylic emulsion comprises the following components in parts by weight: 100 parts methyl acrylate, acrylic acid... 2 8 parts ethylhexyl ester, 3 parts methacrylic acid, 1.5 parts emulsifier B, 7 parts initiator B, and 50 parts electronic-grade deionized water; Emulsifier B is a reactive emulsifier; Initiator B consists of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 0.25:6.5; The functional modified monomer preemulsion comprises the following raw materials in parts by weight: 15 parts hexafluorobutyl acrylate, 30 parts hydroxyethyl acrylate, 15 parts hydroxypropyl acrylate, 1 part emulsifier B, 3 parts initiator C, and 25 parts electronic grade deionized water. Initiator C consists of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 0.12:2.2; The polymerization process includes the following raw materials in parts by weight: 200 parts electronic-grade deionized water, 5 parts emulsifier C, and 20 parts initiator D; Emulsifier C is composed of a reactive emulsifier and an anionic surfactant in a mass ratio of 1.5:2; Initiator D consists of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 1.3:15; A method for preparing a high weather-resistant, low-residue water-based pressure-sensitive adhesive latex includes the following steps: S1. Preparation of nuclear pre-emulsion: Emulsifier A in the core layer raw material is mixed with electronic grade deionized water for 15 min, the remaining core layer raw material is added, and the mixture is stirred at high speed for 25 min to emulsify, thus obtaining the nuclear pre-emulsion; S2. Preparation of shell pre-emulsion: Emulsifier B in the shell raw material is mixed with electronic grade deionized water for 15 min, the remaining shell raw material is added, and the mixture is stirred at high speed for 25 min to emulsify, thus obtaining the shell pre-emulsion. S3. Preparation of functional modified monomer preemulsion: Emulsifier B in the functional modified monomer preemulsion raw material is mixed with electronic grade deionized water for 15 min, the remaining functional modified monomer preemulsion raw material is added, and after emulsification by high-speed stirring for 25 min, the functional modified monomer preemulsion is obtained. S4. Polymerization: Mix electronic-grade deionized water and emulsifier C, heat to 78°C, add 4.5 wt% of core pre-emulsion and initiator D, react for 20 min, maintain the temperature at 76°C, and simultaneously add the remaining core pre-emulsion and initiator A dropwise over 150 min; after the addition is complete, simultaneously add shell pre-emulsion and initiator B dropwise over 50 min; after the addition is complete, simultaneously add functional modified monomer pre-emulsion and initiator C dropwise over 35 min; after the addition is complete, heat to 85°C and maintain the temperature for 60 min, cool to below 40°C, add auxiliary agent A, stir for 30 min, slowly add aqueous crosslinking agent, stir at constant temperature for 40 min, adjust the pH to 8.5 with ammonia water, add auxiliary agent B, stir evenly, filter to remove a small amount of gel and impurities, and obtain a high weather-resistant, low-residue aqueous pressure-sensitive adhesive latex.

[0044] Example 4 Compared with Example 2, Example 4 differs in that the functional modified monomer preemulsion includes the following components by weight: 13 parts trifluoroethyl acrylate, 31.5 parts hydroxyethyl acrylate, 10.5 parts hydroxypropyl acrylate, 0.9 parts emulsifier B, 2.22 parts initiator C, and 21.9 parts electronic grade deionized water; Initiator C consists of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 0.12:2.1.

[0045] Example 5 Compared with Example 2, Example 5 differs in that the functional modified monomer pre-emulsion includes the following components by weight: 13 parts trifluoroethyl acrylate, 21 parts hydroxyethyl acrylate, 21 parts hydroxypropyl acrylate, 0.9 parts emulsifier B, 2.22 parts initiator C, and 21.9 parts electronic grade deionized water; Initiator C consists of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 0.12:2.1.

[0046] Example 6 Compared with Example 2, Example 6 differs in that the hydroxyethyl acrylate in the functional modified monomer preemulsion raw material is replaced with an equal amount of hydroxybutyl methacrylate.

[0047] Example 7 Compared with Example 2, Example 7 differs in that the functional modified monomer preemulsion includes the following components by weight: 11 parts trifluoroethyl acrylate, 29 parts hydroxyethyl acrylate, 15 parts hydroxypropyl acrylate, 0.9 parts emulsifier B, 2.22 parts initiator C, and 21.9 parts electronic grade deionized water. Initiator C consists of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 0.12:2.1.

[0048] Example 8 Compared with Example 2, Example 8 differs in that the functional modified monomer pre-emulsion includes the following components by weight: 13.75 parts of trifluoroethyl acrylate, 27.5 parts of hydroxyethyl acrylate, 13.75 parts of hydroxypropyl acrylate, 0.9 parts of emulsifier B, 2.22 parts of initiator C, and 21.9 parts of electronic grade deionized water; Initiator C consists of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 0.12:2.1.

[0049] Example 9 Compared with Example 2, Example 9 differs in that the functional modified monomer preemulsion includes the following components by weight: 19 parts trifluoroethyl acrylate, 24 parts hydroxyethyl acrylate, 12 parts hydroxypropyl acrylate, 0.9 parts emulsifier B, 2.22 parts initiator C, and 21.9 parts electronic grade deionized water; Initiator C consists of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 0.12:2.1.

[0050] Example 10 Compared with Example 2, Example 10 differs in that step S4 includes the following: Electron-grade deionized water for polymerization and emulsifier C are mixed, heated to 76°C, and 4.3 wt% of core pre-emulsion and initiator D are added. After reacting for 18 min, the temperature is maintained at 75°C, and the remaining core pre-emulsion and initiator A are added dropwise over a time of 150 min. After the addition is complete, shell pre-emulsion and initiator B are added dropwise over a time of 50 min. After the addition is complete, functional modified monomer pre-emulsion and initiator C are added dropwise over a time of 35 min. After the addition is complete, the temperature is raised to 84°C and maintained for 50 min. The temperature is then lowered to below 40°C, and auxiliary agent A is added. After stirring for 55 min, the pH is adjusted to 8 using ammonia water, and auxiliary agent B is added. After stirring evenly, the mixture is filtered to remove a small amount of gel and impurities, resulting in a high-weather-resistant, low-residue aqueous pressure-sensitive adhesive latex.

[0051] Comparative Example 1 Compared with Example 2, Comparative Example 1 differs in that the core layer of the core-shell aqueous acrylic emulsion comprises the following components in parts by weight: 231 parts of n-butyl acrylate, acrylic acid... 2 153 parts ethylhexyl ester, 2 parts methacrylic acid, 8 parts hydroxybutyl methacrylate, 8.2 parts emulsifier A, 18.06 parts initiator A, and 82.8 parts electronic grade deionized water; Emulsifier A consists of a nonionic emulsifier and a reactive emulsifier in a mass ratio of 1.3:6.9; Initiator A consists of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 0.86:17.2.

[0052] Comparative Example 2 Compared with Example 2, Comparative Example 2 differs in that the shell layer of the core-shell aqueous acrylic emulsion comprises the following components in parts by weight: 45 parts methyl acrylate, acrylic acid... 2 Ethylhexyl ester 52.7 parts, methacrylic acid 2.3 parts, emulsifier B 1.1 parts, initiator B 6.43 parts, electronic grade deionized water 45.4 parts; Emulsifier B is a reactive emulsifier; Initiator B consists of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 0.23:6.2.

[0053] Comparative Example 3 Compared with Example 2, Comparative Example 3 differs in that the core layer of the core-shell aqueous acrylic emulsion comprises the following components in parts by weight: 153 parts methyl acrylate, acrylic acid... 2 231 parts ethylhexyl ester, 2 parts methacrylic acid, 8 parts hydroxybutyl methacrylate, 8.2 parts emulsifier A, 18.06 parts initiator A, and 82.8 parts electronic grade deionized water; Emulsifier A consists of a nonionic emulsifier and a reactive emulsifier in a mass ratio of 1.3:6.9; Initiator A consists of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 0.86:17.2.

[0054] Comparative Example 4 Compared with Example 2, Comparative Example 4 differs in that the shell layer of the core-shell aqueous acrylic emulsion comprises the following components in parts by weight: 91 parts n-butyl acrylate, acrylic acid... 2 Ethylhexyl ester 6.7 parts, methacrylic acid 2.3 parts, emulsifier B 1.1 parts, initiator B 6.43 parts, electronic grade deionized water 45.4 parts; Emulsifier B is a reactive emulsifier; Initiator B consists of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 0.23:6.2.

[0055] Comparative Example 5 Compared with Example 2, Comparative Example 5 differs in that the core layer of the core-shell aqueous acrylic emulsion comprises the following components in parts by weight: 153 parts of n-butyl acrylate, acrylic acid... 2 231 parts ethylhexyl ester, 2 parts methacrylic acid, 8.2 parts emulsifier A, 18.06 parts initiator A, and 82.8 parts electronic-grade deionized water; Emulsifier A consists of a nonionic emulsifier and a reactive emulsifier in a mass ratio of 1.3:6.9; Initiator A consists of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 0.86:17.2.

[0056] Comparative Example 6 Compared with Example 2, Comparative Example 6 differs in that the shell layer of the core-shell aqueous acrylic emulsion comprises the following components in parts by weight: 91 parts methyl acrylate, acrylic acid... 2 Ethylhexyl ester 6.7 parts, methacrylic acid 2.3 parts, emulsifier B 1.1 parts, initiator B 6.43 parts, electronic grade deionized water 45.4 parts, hydroxybutyl methacrylate 8 parts; Emulsifier B is a reactive emulsifier; Initiator B consists of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 0.23:6.2.

[0057] Comparative Example 7 Compared with Example 2, Comparative Example 7 differs in that the hydroxybutyl methacrylate in the core layer raw material of the core-shell aqueous acrylate emulsion is replaced with an equal amount of hydroxyethyl acrylate.

[0058] Experimental Example 1 For the high weather-resistant, low-residue water-based pressure-sensitive latexes prepared in Examples 1-10 and Comparative Examples 1-7, the peel strength of the samples before and after low-temperature and high-temperature treatments was tested according to the test methods specified in GB / T2790-2021 "Adhesives - Test Method for 180° Peel Strength". The sample structure consisted of a PET optical film (adhesive film) + a standard stainless steel test plate, with a dry adhesive layer thickness of 20 μm. Low-temperature treatment: -30℃, constant temperature for 24 h, then removed and warmed to 25℃ for 30 min to equilibrate, and the peel strength after low-temperature treatment was tested. High-temperature treatment: constant temperature for 24 h at 85℃, then cooled to 25℃ for 30 min to equilibrate, and the peel strength after high-temperature treatment was tested. Five parallel samples were used for each group of samples, and the arithmetic mean was calculated.

[0059] The test results are shown in Table 1: Table 1 Performance test results of Examples 1-10 and Comparative Examples 1-7

[0060] Experiment Example 2 The high weather-resistant, low residual water-based pressure-sensitive adhesive latex prepared in Example 2 was tested. The substrate was a PET optical film, and the temperature was 25°C. 1. Bending performance: After 100,000 repeated bending cycles at 0~180℃, the adhesive layer shows no cracking, no curling, and no delamination. 2. Residual Adhesive After Peeling: 180° peel test, substrate surface is clean and free of adhesive residue; 3. Optical performance: Light transmittance ≥92.3%, haze ≤0.8%; no obvious yellowing after 500 hours of UV aging; 4. Wetting and coating properties: The adhesive spreads evenly on low surface energy substrates without pinholes or craters. 5. Environmental protection indicators: VOC < 10 mg / L; 6. Storage stability: After 6 months of sealed storage at room temperature, the emulsion in the example showed no stratification, no demulsification, and no performance degradation.

[0061] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A highly weather-resistant, low-residue water-based pressure-sensitive adhesive latex, characterized in that, The product comprises a core-shell aqueous acrylic emulsion, a functionally modified monomer pre-emulsion, additive A, additive B, and a crosslinking agent. The core layer of the core-shell aqueous acrylic emulsion comprises the following components in parts by weight: 150-155 parts of n-butyl acrylate, acrylic acid... 2 230-235 parts ethylhexyl ester, 1-3 parts methacrylic acid, 6-10 parts hydroxybutyl methacrylate, 8-9 parts emulsifier A, 16-20 parts initiator A, and 80-85 parts electronic grade deionized water; The shell layer of the core-shell type aqueous acrylic emulsion comprises the following components in parts by weight: 90-100 parts methyl acrylate, acrylic acid... 2 6-8 parts ethylhexyl ester, 1-3 parts methacrylic acid, 1-1.5 parts emulsifier B, 6-7 parts initiator B, and 40-50 parts electronic-grade deionized water.

2. The high weather-resistant, low-residue water-based pressure-sensitive adhesive latex according to claim 1, characterized in that, The functional modified monomer preemulsion comprises the following components by weight: 10-15 parts of fluorinated modified acrylate monomer, 25-30 parts of hydroxyethyl acrylate, 10-15 parts of hydroxypropyl acrylate, 0.5-1 part of emulsifier B, 2-3 parts of initiator C, and 20-25 parts of electronic grade deionized water.

3. The high weather-resistant, low-residue water-based pressure-sensitive adhesive latex according to claim 1, characterized in that, Emulsifier A is composed of a nonionic emulsifier and a reactive emulsifier in a mass ratio of 1.3~1.5:6.5~7; emulsifier B is a reactive emulsifier.

4. The high weather-resistant, low-residue water-based pressure-sensitive adhesive latex according to claim 1, characterized in that, Initiator A is composed of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 0.8~0.9:17~18; initiator B is composed of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 0.2~0.25:6~6.5; and initiator C is composed of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 0.1~0.12:2~2.

2.

5. The high weather-resistant, low-residue water-based pressure-sensitive adhesive latex according to claim 2, characterized in that, The fluorinated modified acrylate monomers include one or more of trifluoroethyl acrylate, tetrafluoropropyl acrylate, hexafluorobutyl acrylate, and octafluoropentyl acrylate.

6. The high weather-resistant, low-residue water-based pressure-sensitive adhesive latex according to claim 1, characterized in that, The amount of additive A is 20-25 parts. Additive A is composed of a composite weather-resistant stabilizer and an organosilicon leveling agent BYK-333 in a mass ratio of 12:8-9. The composite weather-resistant stabilizer is composed of absorbent UV-540W and antioxidant 1010 in a mass ratio of 1:1.2-1.

3. The amount of additive B is 2-3 parts. Additive B is composed of defoamer and bactericide in a mass ratio of 0.5-0.6:

2.

7. A method for preparing a high weather-resistant, low-residue water-based pressure-sensitive adhesive latex, used to prepare the high weather-resistant, low-residue water-based pressure-sensitive adhesive latex according to any one of claims 1 to 6, characterized in that, Includes the following steps: S1. Preparation of nuclear pre-emulsion: The emulsifier A in the core layer raw material is mixed with the electronic grade deionized water, the remaining core layer raw material is added, and after stirring and emulsifying, a nuclear pre-emulsion is obtained. S2. Preparation of shell pre-emulsion: The emulsifier B in the shell raw material is mixed with the electronic grade deionized water, the remaining shell raw material is added, and after stirring and emulsifying, the shell pre-emulsion is obtained. S3. Preparation of functional modified monomer preemulsion: The emulsifier B in the functional modified monomer preemulsion raw material is mixed with the electronic grade deionized water, and the remaining functional modified monomer preemulsion raw material is added. After stirring and emulsifying, the functional modified monomer preemulsion is obtained. S4. Polymerization: Mix electronic-grade deionized water and emulsifier C, heat to 75-78°C, add 4wt%-4.5wt% of the core pre-emulsion and initiator D, react for 15-20 min, maintain the temperature at 74-76°C, and simultaneously add the remaining core pre-emulsion and initiator A; after the addition is complete, simultaneously add the shell pre-emulsion and initiator B, and then simultaneously add the functional modified monomer pre-emulsion and initiator C; after the addition is complete, heat to 83-85°C and maintain the temperature for 50-60 min, cool to below 40°C, add the auxiliary agent A, stir for 20-30 min, add the aqueous crosslinking agent, stir at a constant temperature for 30-40 min, adjust the pH to 7.5-8.5, add the auxiliary agent B, stir evenly, and filter to obtain the high weather-resistant, low-residue aqueous pressure-sensitive latex.

8. The method for preparing a high weather-resistant, low-residue water-based pressure-sensitive adhesive latex according to claim 7, characterized in that, In step S4, during the polymerization process, the amount of electronic-grade deionized water added for polymerization is 190-200 parts, the amount of emulsifier C added is 3-5 parts, the amount of initiator D added is 15-20 parts, and the aqueous crosslinking agent is an aqueous aziridine crosslinking agent.

9. The method for preparing a high weather-resistant, low-residue water-based pressure-sensitive adhesive latex according to claim 8, characterized in that, The emulsifier C is composed of a reactive emulsifier and an anionic surfactant in a mass ratio of 1.3 to 1.5:2, and the initiator D is composed of azobisisobutyramidine hydrochloride and electronic-grade deionized water in a mass ratio of 1.2 to 1.3:

15.

10. The application of the high weather-resistant, low residual water-based pressure-sensitive adhesive latex prepared by the preparation method of the high weather-resistant, low residual water-based pressure-sensitive adhesive latex according to any one of claims 1 to 6, or according to any one of claims 7 to 9, in the field of flexible electronics.

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