A deodorized UV adhesive and a preparation method thereof

Abstract

The application relates to the technical field of automobile interior materials, in particular to a deodorizing UV glue and a preparation method thereof, which comprises a modified resin matrix, a composite photoinitiator, a deodorizing adsorption component, an ultraviolet light absorber and a heat-resistant filler. Through the construction of a free radical-cation composite initiation system, the synergistic effect of porous adsorbent and anti-aging additives is achieved, source VOC control, long-acting deodorization and excellent weather resistance are realized. After the UV glue is cured, the odor grade is less than or equal to 3, the total VOC is less than 50 mu g / m3, and high adhesive strength is maintained under high temperature and high humidity and in a strong ultraviolet environment, and the UV glue is suitable for automobile interiors and outdoor electronic packaging scenes.

Description

Technical Field

[0001] This invention belongs to the field of automotive interior materials technology, specifically a low-odor UV adhesive and its preparation method. Background Technology

[0002] Currently, UV adhesives, as an important type of photocurable bonding material, are widely used in various fields such as automotive interiors, furniture manufacturing, and electronic packaging. However, traditional UV adhesives often release volatile organic compounds (VOCs) during the curing process, and leave a noticeable odor after curing. This is especially problematic in enclosed spaces such as car cabins, affecting user comfort and potentially posing health risks. Furthermore, although cationic UV adhesives have certain advantages in terms of low VOC emissions, their high raw material costs, sensitivity to moisture, and demanding curing conditions limit their large-scale application in conventional industrial settings.

[0003] To address the aforementioned issues, existing technologies attempt to improve the odor-free properties of UV adhesives through formulation optimization, the introduction of functional additives, or the use of composite curing systems. However, while achieving low odor and low VOC emissions, these methods often struggle to simultaneously maintain the overall performance of the adhesive (such as adhesion, flexibility, and weather resistance), or lead to increased process complexity and production costs. Therefore, developing an odor-free UV adhesive that combines excellent adhesion, significantly reduced VOC release, minimal odor after curing, and a simple preparation process has become a pressing technical challenge in this field.

[0004] Patent CN113754859A discloses a polyurethane-modified epoxy acrylate LED light-curing resin containing aminethioxanthone and its preparation method. This resin incorporates aminethioxanthone-containing photoinitiating groups into its molecular structure, exhibiting high self-initiation activity and good photosensitivity. It eliminates the need for additional tertiary amine co-initiators, thus reducing odor issues caused by small-molecule additives. The resulting coating demonstrates excellent adhesion, water resistance, aging resistance, and "odor-free coating," making it suitable for UV wood coatings, plastic coatings, and other fields. However, this technical solution focuses on the molecular design of the light-curing resin monomers. Its "odor-free" properties mainly stem from improved system compatibility and the omission of small-molecule additives. It does not systematically address the odor problem caused by residual monomers and oligomer volatilization in traditional free-radical UV adhesive systems, nor does it clearly specify the control level of VOC emissions. For demanding applications such as automotive interiors, its odor-free effect may be limited.

[0005] Patent CN108852866A discloses a self-cleaning odor gel nail polish and its preparation method. By adding functional fillers such as tourmaline powder and lanthanide light rare earth elements to the formula, the cured coating possesses the function of releasing negative ions and self-cleaning odors. This gel nail polish can be rapidly cured by UV / LED light irradiation and features vibrant colors, good flexibility, and "self-cleaning odor." Although this solution proposes the idea of ​​actively eliminating odors through functional inorganic fillers, its application is limited to nail polish gel, which has relatively low requirements for engineering performance such as adhesive strength, heat resistance, and chemical resistance. Directly transferring this technology to UV adhesives for structural bonding or decorative lamination may affect the transparency, mechanical strength, and long-term stability of the adhesive layer due to the introduction of a large amount of inorganic fillers. Furthermore, this solution does not suppress VOC generation at the source but relies on subsequent physical adsorption or chemical conversion; the durability and reliability of its odor-cleaning effect remain to be verified.

[0006] In summary, existing technologies either focus on optimizing the photoinitiation system to reduce the odor of additives or rely on functional fillers to achieve odor post-treatment. However, there is still room for improvement in synergistically controlling VOC release and residual odor after curing from the source of the formulation, while ensuring that the overall performance of the adhesive meets the needs of industrial applications. Summary of the Invention

[0007] This invention provides an odor-neutralizing UV adhesive and its preparation method. The aim is to control the release of volatile organic compounds (VOCs) and eliminate residual odors after curing by constructing a composite photoinitiation system, introducing highly efficient adsorption odor-neutralizing components, and synergistically adding anti-UV aging components and heat-resistant fillers. At the same time, it improves the structural stability and bonding reliability of the material under high temperature and strong UV irradiation environments.

[0008] In a first aspect, the present invention provides a method for preparing an odor-free UV adhesive, comprising the following steps: S10: Add the modified resin matrix, photoinitiator, leveling agent, defoamer, odor-neutralizing adsorbent, ultraviolet absorber and heat-resistant filler to the mixing container in proportion; S20: Under a nitrogen protective atmosphere, mix at a stirring rate of 500 r / min to 1500 r / min for 30 to 90 minutes within a temperature range of 30°C to 50°C to obtain a uniformly dispersed premixed adhesive solution. S30: Place the premixed adhesive solution under an ultraviolet light source with a wavelength of 365nm to 405nm and irradiate it with a light intensity of 50mW / cm² to 200mW / cm² for 10 to 120 seconds to complete the photocuring reaction and obtain the odorless UV adhesive.

[0009] Further, in step S10, the modified resin matrix is ​​selected from at least one of epoxy resin and acrylate resin; when epoxy resin is used, its epoxy equivalent is 180 g / mol to 220 g / mol, and its number average molecular weight is 350 to 450; when acrylate resin is used, its functionality is 2 to 6, and its viscosity at 25°C is 5000 mPa·s to 15000 mPa·s. The modified resin matrix accounts for 70% to 80% of the mass percentage in the odor-free UV adhesive.

[0010] Furthermore, the photoinitiator is composed of a free radical photoinitiator and a cationic photoinitiator, with a mass ratio of 1:0.5 to 1:3; the free radical photoinitiator is selected from at least one of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide (TPO) and 1-hydroxycyclohexylphenyl ketone (Irgacure 184); the cationic photoinitiator is selected from at least one of triphenylsulfonium hexafluorophosphate and diaryliodomonium hexafluoroantimonate; the total amount of photoinitiator added accounts for 2% to 5% of the total mass of the odor-free UV adhesive.

[0011] Furthermore, the leveling agent is a siloxane polymer with a weight-average molecular weight of 5,000 to 20,000 and a surface tension of 20 to 25 millinewtons per meter, and is added to the odor-free UV adhesive at an amount of 0.5% to 2%; the defoamer is a polyether-modified silicone with an HLB value of 3 to 6, and is added to the odor-free UV adhesive at an amount of 0.5% to 2%.

[0012] Furthermore, the odor-neutralizing adsorption component is a porous adsorption material selected from at least one of bio-activated carbon and zeolite molecular sieves; the bio-activated carbon has a specific surface area of ​​800 g / m² to 1500 g / m², and a pore size distribution concentrated in the range of 1 nm to 5 nm; the zeolite molecular sieve is of type ZSM-5 or Beta, with a silica-alumina ratio of 20 to 100 and an average pore size of 0.55 nm to 0.75 nm; the amount of the odor-neutralizing adsorption component added to the odor-neutralizing UV adhesive is 4% to 8%. The odor-neutralizing adsorption component is uniformly dispersed in the continuous resin phase before the colloid is cured, and its microporous structure continuously captures residual low molecular weight monomers, solvents, and byproducts in the system during the curing process; after curing, the component remains in the cross-linked network, performing long-term physical adsorption of trace amounts of VOCs slowly released in the usage environment, preventing odor accumulation.

[0013] Furthermore, the ultraviolet absorber is selected from at least one of salicylate compounds or benzophenone derivatives; the salicylate compounds are octyl salicylate or phenyl salicylate, with a maximum ultraviolet absorption wavelength between 300 nm and 330 nm; the benzophenone derivatives are 2-hydroxy-4-methoxybenzophenone or 2,2'-dihydroxy-4-methoxybenzophenone, with a maximum ultraviolet absorption wavelength between 320 nm and 360 nm; the amount of the ultraviolet absorber added to the odor-neutralizing UV adhesive is 1% to 3%. The ultraviolet absorber has a high molar absorptivity in the 300 nm to 330 nm wavelength range, and its molecular structure contains hydroxyl or methoxy substituents, which can stabilize the excited state through intramolecular hydrogen bonds, convert the absorbed ultraviolet light energy into heat energy for release, avoid high-energy photons directly acting on the polymer backbone, inhibit the photolytic breakage of C-C bonds or CO bonds, and delay yellowing and mechanical property degradation.

[0014] Furthermore, the heat-resistant filler is selected from at least one of mica powder or ceramic microspheres; the mica powder is synthetic fluorophlogopite with a particle size of 1µm to 10µm and a thermal decomposition temperature higher than 900℃; the ceramic microspheres are hollow alumina-silica composite microspheres with a particle size of 5µm to 20µm, a bulk density of 0.3g / cm³ to 0.6g / cm³, and a thermal conductivity of 0.05W(m·K) to 0.15W(m·K); the amount of the heat-resistant filler added to the odor-free UV adhesive is 3% to 7%. The heat-resistant filler forms a three-dimensional heat-insulating network in the adhesive layer, wherein the hollow structure of the ceramic microspheres effectively blocks heat conduction, and the lamellar structure of the mica powder is oriented along the plane of the adhesive layer, hindering the transfer of heat in the vertical direction; the two work together to increase the heat distortion temperature of the adhesive layer, enabling it to maintain dimensional stability and adhesive strength at an environment of 120℃ to 150℃.

[0015] Furthermore, in step S20, the mixing process is carried out in two stages: in the first stage, the mixture is stirred at 500 r / min to 800 r / min at 30°C to 40°C for 20 to 40 minutes to initially wet the resin matrix and additives; in the second stage, the temperature is raised to 40°C to 50°C, the stirring rate is increased to 1000 r / min to 1500 r / min, and stirring is continued for 10 to 50 minutes to fully disperse the odor-reducing adsorbent, the ultraviolet absorber, and the heat-resistant filler without agglomeration.

[0016] Furthermore, in step S30, the ultraviolet light source is an LED point light source or a mercury lamp surface light source, the irradiation distance is 5 cm to 15 cm, and the thickness of the adhesive layer is controlled to be 0.05 mm to 0.5 mm during the irradiation process to ensure that the photoinitiator is fully activated and completes the crosslinking reaction.

[0017] Secondly, the present invention provides an odor-free UV adhesive, which is prepared by the preparation method described in any embodiment of the first aspect, wherein the odor-free UV adhesive comprises the following components and their mass percentages: Modified resin matrix: 70%-80%; Photoinitiator: 2%-5%; Leveling agent: 0.5%-2%; Defoamer: 0.5%-2%; Odor-absorbing adsorption components: 4%-8%; UV absorber: 1%-3%; Heat-resistant filler: 3%-7%.

[0018] Furthermore, when the modified resin matrix is ​​epoxy resin, the photoinitiator comprises TPO and triphenylsulfonium hexafluorophosphate in a mass ratio of 1:1 to 1:2; when the modified resin matrix is ​​acrylate resin, the photoinitiator comprises TPO and diaryliodonium hexafluoroantimonate in a mass ratio of 1:0.8 to 1:1.5. This composite photoinitiation system simultaneously generates free radicals and cations under ultraviolet irradiation, which respectively initiate the polymerization reaction of acrylate double bonds and epoxy groups, forming an interpenetrating network structure, reducing unreacted monomer residues, and thus lowering VOC emission sources.

[0019] In summary, this invention, through precise control of the resin matrix type, photoinitiation system ratio, odor-eliminating adsorption component types, UV absorber structure, and heat-resistant filler morphology, constructs a multifunctional UV adhesive system that combines source control of VOCs, long-lasting odor removal, UV aging resistance, and high-temperature resistance. This technical solution not only solves the odor and health hazards associated with traditional UV adhesives in the enclosed space of automobiles, but also expands the material's functionality, making it suitable for fields with higher environmental tolerance requirements, such as electronics, energy, and outdoor construction. This overcomes the technical bottlenecks of existing odor-eliminating UV adhesives, which suffer from limited application scenarios and compromised performance. Detailed Implementation

[0020] The various embodiments or implementation schemes in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Example

[0021] This embodiment provides an odor-neutralizing UV adhesive based on epoxy resin and its preparation method.

[0022] First, weigh the following components according to their mass percentages: 75% bisphenol A epoxy resin with an epoxy equivalent of 200 g / mol and a number-average molecular weight of 400; 1.5% free radical photoinitiator TPO; 2.0% cationic photoinitiator triphenylsulfonium hexafluorophosphate; 1.0% polydimethylsiloxane leveling agent with a weight-average molecular weight of 12,000 and a surface tension of 22 mN / m; 1.0% polyether-modified silicone defoamer with an HLB value of 4.5; 6.0% bioactive carbon with a specific surface area of ​​1200 g / m² and a pore size distribution concentrated in the range of 2 nm to 4 nm; 2.0% 2-hydroxy-4-methoxybenzophenone with a maximum ultraviolet absorption wavelength of 340 nm; and 4.5% synthetic fluorophlogopite with a particle size of 5 µm to 8 µm and a thermal decomposition temperature of 950 °C.

[0023] The above components were sequentially added to a stainless steel reactor equipped with a nitrogen inlet and a mechanical stirrer. Nitrogen purging was performed three times to ensure the oxygen content in the reaction system was below 50 ppm. The constant-temperature stirring system was started, with an initial temperature of 35°C and a stirring rate of 600 rpm, and stirring continued for 30 minutes to allow the epoxy resin to fully melt and initially wet and mix with the leveling agent, defoamer, and photoinitiator. The temperature was then raised to 45°C, and the stirring rate was increased to 1200 rpm, continuing stirring for another 30 minutes to ensure uniform dispersion of the bio-activated carbon, UV absorber, and mica powder, with no visible agglomerates. Samples were taken and analyzed using a laser particle size analyzer; the filler D90 particle size was less than 15 µm, indicating good dispersion.

[0024] The obtained premixed adhesive was transferred to a coating platform, and the adhesive layer thickness was controlled to be 0.2 mm using a doctor blade. It was then irradiated under an LED ultraviolet light source (wavelength 395 nm, light intensity 120 mW / cm², irradiation distance 10 cm) for 45 seconds. After curing, the film was peeled off from the release film to obtain a transparent, slightly gray, elastic solid adhesive film. Example

[0025] This embodiment provides an odor-neutralizing UV adhesive based on acrylate resin and its preparation method.

[0026] Weigh the following by mass percentage: 78% aliphatic polyurethane acrylate with a functionality of 4 and a viscosity of 10000 mPa·s at 25℃; 1.8% TPO; 1.2% diaryliodonium hexafluoroantimonate; 0.8% siloxane leveling agent with a weight-average molecular weight of 8000 and a surface tension of 21 mN / m; 0.7% polyether-modified silicone defoamer with an HLB value of 5.0; 7.0% ZSM-5 zeolite molecular sieve with a silica-alumina ratio of 50 and an average pore size of 0.65 nm; 1.5% octyl salicylate; and 5.0% hollow alumina-silica composite ceramic microspheres (particle size 8µm to 15µm, bulk density 0.45 g / cm³, thermal conductivity 0.10 W / (m·K)).

[0027] The above materials were placed in a nitrogen-protected mixing vessel and stirred at 32°C and 700 rpm for 25 minutes, then heated to 48°C and stirred at 1300 rpm for 35 minutes to obtain a homogeneous premix. This premix was then coated into a 0.15 mm thick layer and cured by irradiation with a mercury lamp surface light source (main wavelength 365 nm, light intensity 150 mW / cm², distance 8 cm) for 30 seconds. Example

[0028] This embodiment adjusts the ratio of the composite photoinitiator system based on Example 1 and adopts a two-stage filler dispersion process.

[0029] Formulation composition: 76% epoxy resin; 1.2% TPO; 2.4% triphenylsulfonium hexafluorophosphate (mass ratio 1:2); 1.2% leveling agent; 0.8% defoamer; 7.0% total amount of bio-activated carbon and Beta zeolite molecular sieve (silicon-aluminum ratio 80) compounded in a 1:1 mass ratio; 2.5% 2,2'-dihydroxy-4-methoxybenzophenone; 6.0% total amount of synthetic fluorophlogopite and ceramic microspheres compounded in a 2:1 mass ratio.

[0030] Mixing process: First stage: 38℃, 750r / min, stirring for 35 minutes; Second stage: 46℃, 1400r / min, stirring for 40 minutes. UV curing conditions: 365nm LED light source, light intensity 100mW / cm², irradiation for 60 seconds, adhesive layer thickness 0.25mm. Example

[0031] This embodiment optimizes the odor-absorbing components for bonding PVC interior materials.

[0032] The composition consists of 77% acrylate resin, 2.0% TPO, 1.0% diaryliodonium hexafluoroantimonate (mass ratio 2:1), 0.9% leveling agent, 0.9% defoamer, and only ZSM-5 zeolite molecular sieve (silicon-aluminum ratio 100) as the deodorizing adsorption component, with an addition amount of 7.5%; 1.8% phenyl salicylate; and 6.0% ceramic microspheres.

[0033] The mixing process is the same as in Example 2. During curing, a step-by-step irradiation method is used: first, irradiate with 50mW / cm² for 20 seconds to form a surface film, and then irradiate with 180mW / cm² for 40 seconds to complete the overall curing, with a total adhesive layer thickness of 0.3mm.

[0034] Comparative Example 1 A conventional single-system photoinitiator was used: 75% epoxy resin; only 4.0% TPO was added; the remaining components were the same as in Example 1, but without cationic initiators and heat-resistant fillers, and the amount of odor-reducing adsorption components was reduced to 2%. The mixing and curing conditions were the same.

[0035] Comparative Example 2 Nitrogen protection was not used; the remaining formulation and process were the same as in Example 1. Mixing and curing were carried out in an air atmosphere.

[0036] Comparative Example 3 The ultraviolet light absorber is omitted, and the rest is the same as in Example 2.

[0037] The UV adhesives prepared in the above embodiments and comparative examples were tested for performance according to the following standards: VOC emission was tested according to GB / T27630-2011; odor level was evaluated according to ISO 12219-3; heat and humidity aging performance was tested by measuring shear strength retention after 500 hours at 85℃ and 85%RH; QUV aging was tested by measuring adhesive strength retention and appearance changes after 1000 hours of UVA-340 lamp (0.77W / ㎡@340nm), 60℃ light exposure / 50℃ condensation cycle. The performance of the embodiments of the present invention is significantly better than that of the comparative examples. Comparative Example 1 had poor VOC and odor control due to the lack of a composite initiation system and sufficient adsorption components, and the lack of heat-resistant filler resulted in insufficient thermal stability; Comparative Example 2 had low conversion rate and a lot of residual monomers due to oxygen inhibiting free radical polymerization; Although the odor control of Comparative Example 3 was acceptable, its long-term weather resistance was greatly reduced due to the lack of UV absorbers.

[0038] In the bonding application of PP and PU foam materials for automotive headliners, the adhesive in Example 1, after being applied as a 0.2mm thick layer, achieved a peel strength of 4.2 N / mm after 50 seconds of irradiation with 395nm ultraviolet light (120mW / cm²) in a nitrogen atmosphere. After 1000 hours of QUV aging, it maintained a peel strength of 3.8 N / mm, and the odor level remained at level 2. In the coating of PVC door panels containing dioctyl phthalate plasticizer, Example 4, due to the use of a high silica-to-alumina ratio ZSM-5 molecular sieve, effectively adsorbed the migrating plasticizer decomposition products. After 7 days of heat aging at 150℃, there was no interface debonding, and the odor did not rebound.

[0039] In all embodiments, the mixing process temperature was strictly controlled to not exceed 50°C to avoid premature resin reaction; the stirring rate was dynamically adjusted according to the material viscosity to ensure uniform dispersion of the highly filled system; the adhesive layer thickness was controlled within the range of 0.05mm to 0.5mm during UV curing to ensure that the light penetration depth matched the reaction efficiency. All raw materials used were commercially available industrial-grade products, including epoxy resin purchased from Huntsman EPON 828, acrylate resin from Allnex EBECRYL 8402, TPO from BASF Irgacure TPO, triphenylsulfonium hexafluorophosphate from San-Apro CPI-100P, ZSM-5 zeolite from ZeolystCBV 20A, and synthesized fluorophlogopite from Nippon Kasei Mica Co. Fluorophlogopite.

[0040] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing an odor-free UV adhesive, characterized in that, Includes the following steps: S10: Add the modified resin matrix, photoinitiator, leveling agent, defoamer, odor-neutralizing adsorbent, ultraviolet absorber and heat-resistant filler to the mixing container in proportion; S20: Under a nitrogen protective atmosphere, mix for 30 to 90 minutes at a stirring rate of 500 r / min to 1500 r / min within a temperature range of 30°C to 50°C to obtain a uniformly dispersed premixed adhesive solution. S30: Place the premixed adhesive solution under an ultraviolet light source with a wavelength of 365nm to 405nm and irradiate it with a light intensity of 50mW / cm² to 200mW / cm² for 10 to 120 seconds to complete the photocuring reaction and obtain the odorless UV adhesive.

2. The method for preparing an odor-neutralizing UV adhesive according to claim 1, characterized in that, The modified resin matrix is ​​selected from at least one of epoxy resin and acrylate resin; when epoxy resin is used, its epoxy equivalent is 180 g / mol to 220 g / mol and its number average molecular weight is 350 to 450; when acrylate resin is used, its functionality is 2 to 6 and its viscosity at 25°C is 5000 mPa·s to 15000 mPa·s; the mass percentage of the modified resin matrix in the odor-free UV adhesive is 70% to 80%.

3. The method for preparing an odor-neutralizing UV adhesive according to claim 1, characterized in that, The photoinitiator is composed of a free radical photoinitiator and a cationic photoinitiator, with a mass ratio of 1:0.5 to 1:3; the free radical photoinitiator is selected from at least one of 2,4,6-trimethylbenzoyl-diphenylphosphine oxide and 1-hydroxycyclohexylphenyl ketone; the cationic photoinitiator is selected from at least one of triphenylsulfonium hexafluorophosphate and diaryliodonium hexafluoroantimonate; the total amount of photoinitiator added accounts for 2% to 5% of the total mass of the odor-free UV adhesive.

4. The method for preparing an odor-neutralizing UV adhesive according to claim 1, characterized in that, The odor-neutralizing adsorption component is a porous adsorption material selected from at least one of bio-activated carbon and zeolite molecular sieves; the bio-activated carbon has a specific surface area of ​​800 g / m² to 1500 g / m² and a pore size distribution concentrated in the range of 1 nm to 5 nm; the zeolite molecular sieve is of type ZSM-5 or Beta, with a silica-alumina ratio of 20 to 100 and an average pore size of 0.55 nm to 0.75 nm; the amount of the odor-neutralizing adsorption component added to the odor-neutralizing UV adhesive is 4% to 8%.

5. The method for preparing an odor-neutralizing UV adhesive according to claim 1, characterized in that, The ultraviolet light absorber is selected from at least one of salicylate compounds or benzophenone derivatives; the salicylate compound is octyl salicylate or phenyl salicylate; the benzophenone derivative is 2-hydroxy-4-methoxybenzophenone or 2,2'-dihydroxy-4-methoxybenzophenone; the amount of ultraviolet light absorber added to the odor-neutralizing UV adhesive is 1% to 3%.

6. The method for preparing an odor-neutralizing UV adhesive according to claim 1, characterized in that, The heat-resistant filler is selected from at least one of mica powder or ceramic microspheres; the mica powder is synthetic fluorophlogopite with a particle size of 1µm to 10µm and a thermal decomposition temperature higher than 900℃; the ceramic microspheres are hollow alumina-silica composite microspheres with a particle size of 5µm to 20µm, a bulk density of 0.3g / cm³ to 0.6g / cm³, and a thermal conductivity of 0.05W(m·K) to 0.15W(m·K); the amount of the heat-resistant filler added to the odor-free UV adhesive is 3% to 7%.

7. The method for preparing an odor-neutralizing UV adhesive according to claim 1, characterized in that, In step S20, the mixing process is carried out in two stages: the first stage is to stir at 500 r / min to 800 r / min at 30°C to 40°C for 20 to 40 minutes. In the second stage, the temperature is increased to 40°C to 50°C, the stirring speed is increased to 1000 r / min to 1500 r / min, and stirring is continued for 10 to 50 minutes.

8. The method for preparing an odor-neutralizing UV adhesive according to claim 1, characterized in that, In step S30, the ultraviolet light source is an LED point light source or a mercury lamp surface light source, the irradiation distance is 5 cm to 15 cm, and the adhesive layer thickness is 0.05 mm to 0.5 mm.

9. An odor-neutralizing UV adhesive, characterized in that, Prepared by the preparation method according to any one of claims 1 to 8, comprising the following components and their mass percentages: Modified resin matrix: 70%-80%; Photoinitiator: 2%-5%; Leveling agent: 0.5%-2%; Defoamer: 0.5%-2%; Odor-absorbing adsorption components: 4%-8%; UV absorber: 1%-3%; Heat-resistant filler: 3%-7%.

10. The odor-neutralizing UV adhesive according to claim 9, characterized in that, When the modified resin matrix is ​​epoxy resin, the photoinitiator comprises 2,4,6-trimethylbenzoyl-diphenylphosphine oxide and triphenylsulfonium hexafluorophosphate in a mass ratio of 1:1 to 1:2; when the modified resin matrix is ​​acrylate resin, the photoinitiator comprises 2,4,6-trimethylbenzoyl-diphenylphosphine oxide and diaryliodonium hexafluoroantimonate in a mass ratio of 1:0.8 to 1:1.5.