Adhesive force treating agent for optical coating layer of glass fiber composite mobile phone

Abstract

The invention discloses a glass fiber composite material mobile phone optical coating adhesive force treating agent, and relates to the technical field of paints.The glass fiber composite material mobile phone optical coating adhesive force treating agent comprises a component A and a component B. The component A comprises, by mass, 5-15% of high-molecular-weight saturated copolyester resin; 1-10% of a nonionic modified polyester resin; 1-5% of a silane coupling agent; 0.05%-0.5% of an organic bismuth drier; 5-10% of matting slurry; 0.5 to 5% of aziridine; 3-10% of cyclohexanone; 10-20% of toluene; 10 to 20% of methyl ethyl ketone; 20 to 30% of butyl acetate; 20 to 30% of propylene glycol methyl ether acetate; the component B is prepared from the following components in percentage by mass: 50 to 100 percent of isocyanate tripolymer; and 0-50% of butyl acetate. The high-molecular-weight special copolyester resin is used, so that the problems of unstable adhesive force test and unstable high-temperature boiling resistance of the optical coating layer which puzzles all the time are solved; the nonionic modified polyester resin is used, so that the overall flexibility of the mobile phone coating is improved, and the problems that the mobile phone coating is resistant to falling, free of paint collapse and free of cracking are solved.

Description

Technical Field

[0001] This invention relates to the field of coatings, specifically to an adhesion treatment agent for optical coating layers on glass fiber composite materials for mobile phones. Background Technology

[0002] Competition intensifies in the consumer electronics market, with textures and lighting effects becoming core selling points for products such as mobile phones and laptops. Fiberglass, due to its advantages of being lightweight, thin, highly resilient, and compatible with 3D molding, is widely used as a substrate for electronic product casings. The industry commonly employs a multi-coating process of "UV primer + optical coating + texture imprinting" to achieve a metallic finish.

[0003] Optical coatings are physically stacked from inorganic materials such as SiO2 and ZrO2, resulting in high surface hardness and smoothness, which makes coating adhesion a key challenge. In addition, the spraying process requires efficient curing, and the product must pass stringent tests such as boiling, bending, and weathering. Furthermore, the coating system includes 3-4 layers of primer and topcoat. How to balance the adhesion of the optical coating, the overall coherence of multiple layers, and the flexibility of the system has become a key bottleneck restricting the stable application of the process.

[0004] Currently, the treatment agents on the market for improving the adhesion of optical coatings are mainly divided into two categories, but both have significant technical defects and are difficult to meet the needs of practical applications:

[0005] 1. Single-component spray coating agents, represented by chlorinated polypropylene resin and carboxyl-containing ternary chloroacetic acid resin; these agents have seriously excessive halogen content, failing to meet the 3C coating hazardous substance control standards; they have poor film-forming properties and are highly corrosive to optical coatings, and are prone to defects such as paint film blistering, delamination, and coating discoloration in boiling water tests, and have been gradually withdrawn from the market.

[0006] 2. Two-component polyurethane adhesives, with hydroxyl acrylic resin and thermoplastic acrylic resin as the main components and supplemented with acidic adhesion promoters, are low-cost and easy to apply, and can solve common adhesion problems. However, they have three major drawbacks:

[0007] (1) Poor film thickness adaptability: When the film thickness is less than 10µm, the adhesion is unstable. If it is too thick, it will block optical reflection and reduce the metallic texture, making it difficult to balance the effect and the firmness.

[0008] (2) Insufficient environmental stability: low degree of cross-linking, adhesion is easily weakened under long-term high temperature boiling or high temperature and high humidity environment;

[0009] (3) Lack of system flexibility: The flexibility of the coating film decreases after the film thickness increases, and the mechanical properties such as resistance to bending and falling ball impact fluctuate greatly.

[0010] In summary, existing treatment agents cannot simultaneously meet the comprehensive requirements of "optical coating adhesion, multi-coating bonding, flexibility and environmental reliability testing", and there is an urgent need to develop new treatment technologies to overcome process bottlenecks. Summary of the Invention

[0011] The purpose of this invention is to provide an adhesion treatment agent for optical coating layers of glass fiber composite materials for mobile phones, which aims to solve the above-mentioned problems. The high molecular weight special copolyester resin used in this invention solves the problem of unstable adhesion testing and unstable high-temperature water boiling resistance of optical coating layers. The use of non-ionic modified polyester resin improves the overall flexibility of mobile phone coatings and solves the problem of mobile phone coatings being drop-resistant, not chipping, and not cracking.

[0012] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0013] An adhesion promoter for optical coatings on glass fiber composite materials used in mobile phones, comprising component A and component B, wherein component A, by mass percentage, comprises the following components:

[0014] High molecular weight saturated copolyester resin: 5-15%;

[0015] Nonionic modified polyester resin: 1-10%;

[0016] Silane coupling agent: 1-5%;

[0017] Organic bismuth drying agent: 0.05-0.5%;

[0018] Matte paste: 5-10%;

[0019] Aziprodine: 0.5-5%;

[0020] Cyclohexanone: 3-10%;

[0021] Toluene: 10-20%;

[0022] Methyl ethyl ketone: 10-20%;

[0023] Butyl acetate: 20-30%;

[0024] Propylene glycol methyl ether acetate: 20-30%;

[0025] Component B, by mass percentage, includes the following components:

[0026] Isocyanate trimer: 50-100%;

[0027] Butyl acetate: 0-50%.

[0028] Preferably, the viscosity of the treatment agent is 7.5-7.8 s / 25℃. During construction, the components A and B are mixed evenly at a ratio of 100:(1-5). After spraying, the mixture is baked at 75°C for 10-12 minutes to cure.

[0029] Preferably, the high molecular weight saturated copolyester resin used is VYLON270 from Toyobo Co., Ltd. of Japan.

[0030] Preferably, the nonionic modified polyester resin used is LTW provided by Evonik Specialty Chemicals (Shanghai) Co., Ltd.

[0031] Preferably, the silane coupling agent is glycidyl ether propyltrimethoxysilane, i.e., CH2CCH2COO(CH2)3Si(OCH3)3.

[0032] Preferably, the silane coupling agent used is OFS-6040 from Dow Corning (USA).

[0033] Preferably, the matte paste used is FA-341 from Gifu Chemical New Materials (Nantong) Co., Ltd.

[0034] Preferably, the aziridine used is XL706 from Starr International Ltd.

[0035] Preferably, the isocyanate trimer is a hexamethylene diisocyanate trimer.

[0036] Preferably, the isocyanate trimer is N75 from Covestro AG, Germany.

[0037] The adhesion treatment agent for optical coating layers on mobile phones made of glass fiber composite materials of the present invention has the following beneficial effects:

[0038] 1. The fiberglass composite material mobile phone optical coating adhesion treatment agent of the present invention is environmentally friendly and safe. The coating does not contain heavy metals or halogens and complies with environmental regulations such as RoHS and REACH.

[0039] 2. The fiberglass composite material mobile phone optical coating adhesion treatment agent of this invention has excellent film-forming and adhesion properties. Conventional treatment agents, if the coating thickness is too thin, cannot completely cover the optical coating layer, resulting in unstable adhesion and paint peeling in different locations on the same plane, posing construction risks and hidden dangers. If the coating is too thick, the light transmittance is insufficient, affecting the metallic texture of the optical coating layer. This invention can achieve stable adhesion with a maximum film thickness of 2µm. The light transmittance is better at lower film thickness, making the optical coating layer more three-dimensional and the overall effect better.

[0040] 3. The fiberglass composite material mobile phone optical coating adhesion treatment agent of the present invention has a high degree of crosslinking, good high temperature resistance, and stable weather resistance test; conventional treatment agents have a low degree of crosslinking, poor resistance to boiling water penetration, and the paint film surface is prone to rashes after boiling, resulting in decreased adhesion, discoloration of the optical coating layer, and poor test results. The present invention has stable adhesion after boiling in extreme boiling water for 3 hours, with no change in the appearance of the paint film and no discoloration of the optical coating layer.

[0041] 4. The fiberglass composite material mobile phone optical coating adhesion treatment agent of this invention has excellent flexibility. It does not chip or crack when bent. Other treatment agents on the market generally result in a drop ball test of 15CM after spraying, while this invention can pass the drop ball test of 25CM, with a limit of 30CM.

[0042] 5. The adhesion treatment agent for the optical coating layer of glass fiber composite material for mobile phones of the present invention has fast drying properties and meets the requirements of automatic spraying construction process with curing time of 10-12 minutes. Detailed Implementation

[0043] To enable those skilled in the art to better understand the technical solution of the present invention, the product of the present invention will be further described in detail below with reference to embodiments.

[0044] It should be noted that all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0045] An adhesion promoter for optical coatings on fiberglass composite mobile phones, relating to the field of coating technology, includes component A and component B. Component A, by mass percentage, comprises the following components: 5-15% high molecular weight saturated copolyester resin; 1-10% nonionic modified polyester resin; 1-5% silane coupling agent; 0.05-0.5% organic bismuth drier; 5-10% matting paste; 0.5-5% aziridine; 3-10% cyclohexanone; 10-20% toluene; 10-20% methyl ethyl ketone; 20-30% butyl acetate; and 20-30% propylene glycol methyl ether acetate. Component B, by mass percentage, comprises the following components: 50-100% isocyanate trimer; and 0-50% butyl acetate. The viscosity of this promoter is 7.5-7.8 s / 25℃. During application, components A and B are mixed evenly in a ratio of 100:(1-5), and after spraying, the mixture is baked at 75°C for 10-12 minutes for curing.

[0046] The high molecular weight saturated copolyester resin used is VYLON 270 from Toyobo Co., Ltd. of Japan. It has a high molecular weight and a linear saturated molecular chain structure. The numerous hydroxyl groups in the molecular chain can undergo a polyurethane crosslinking reaction with the -NCO groups of the isocyanate trimer in component B, forming a continuous film layer with a certain degree of elasticity. Simultaneously, the entanglement of long-chain molecules can enhance the cohesive strength of the film layer and strengthen its physical adsorption capacity. Conventional high molecular weight resins are prone to decreased film-forming properties due to poor molecular chain mobility, while VYLON 270, at a ratio of 5-15%, forms a balance of low viscosity and high film-forming properties with the mixed solvent system, thus ensuring that the viscosity of the treatment agent is controlled at 7.5-7.8. Within a construction window of s / 25℃, it can form a dense film without pinholes when coated with a thin layer of 8-10µm, breaking through the conventional understanding that it is difficult to form a film with a thin coating of high molecular weight resin; in addition, its saturated molecular chain structure forms a weak polarity match with the inorganic surface of the optical coating layer, which further enhances the physical adsorption force on the basis of silane coupling agent bridging, so that the adhesion in the cross-cut adhesion test is stable at level 0.

[0047] The nonionic modified polyester resin used is LTW supplied by Evonik Specialty Chemicals (Shanghai) Co., Ltd. Evonik LTW resin introduces nonionic modifying groups, such as polyether segments, at the ends of its molecular chains, reducing intermolecular polar forces while retaining a small amount of hydroxyl groups to participate in crosslinking reactions. Its low surface energy characteristics improve interfacial compatibility with various coatings and reduce interlayer tension. Conventional modified polyester resins often enhance compatibility by increasing polarity, while LTW's nonionic structure achieves bidirectional compatibility. On the one hand, it can form hydrogen bonds with the hydrolysis products of polar silane coupling agents containing silanol groups, and on the other hand, it can achieve molecular chain entanglement with nonpolar topcoat resins such as acrylic resins. This increases the interfacial bonding strength of the primer, treatment layer, and topcoat by more than 30%. Furthermore, a low ratio of 1-10% can eliminate stress accumulation in multi-layer systems. In the bending resistance test at the curvature of the 3D shell, even with a film thickness of up to 12µm, no cracks were observed.

[0048] The silane coupling agent used is glycidyl ether propyltrimethoxysilane, i.e., CH2CCH2COO(CH2)3Si(OCH3)3. The silane coupling agent used is OFS-6040 from Dow Corning (USA), which has a dual-active structure of epoxy groups and siloxane groups. The siloxane groups rapidly hydrolyze in trace amounts of moisture to generate silanol groups, which condense with the hydroxyl groups on the surface of materials such as SiO2 and ZrO2 in the optical coating layer to form Si-O-Si chemical bonds. The epoxy groups then undergo a ring-opening reaction with the hydroxyl groups of the polyester resin under organobismuth catalysis, constructing an inorganic-to-organic transition layer. OFS-6040 is selected in this invention. In this mixed solvent system, the hydrolysis reaction can be carried out in real time during construction by means of the hydrolysis-aiding effect of butyl acetate and propylene glycol methyl ether acetate, without the need for pre-preparation of hydrolysate, thus solving the industry problem of easy self-polymerization failure of silane hydrolysates; in addition, the 1-5% ratio not only connects the coating layer and the treatment layer, but its unreacted epoxy groups can also crosslink with the subsequent topcoat resin, so that the overall coating system forms a single continuous network, and there is no interlayer peeling after boiling in water for 2 hours.

[0049] The organic bismuth drier activates the -NCO groups of isocyanate through coordination, reducing the activation energy of its reaction with the hydroxyl groups of polyester resin, accelerating the polyurethane crosslinking reaction process, and shortening the curing time. At a low dosage of 0.05-0.5%, the organic bismuth drier achieves a crosslinking degree of over 90% after baking at 75°C for 10 minutes, which is 45°C lower and 50% shorter than existing technologies (120°C / 20 minutes), with no risk of yellowing. Furthermore, its catalytic activity is selective, preferentially promoting the reaction between isocyanate and polyester hydroxyl groups, avoiding excessive reaction with silane hydrolysis products that could lead to film embrittlement, thus resolving the contradiction that driers easily damage the system's flexibility.

[0050] The matting paste used is FA-341 from Gifu Chemical New Materials (Nantong) Co., Ltd., which is a silica-based matting paste. It forms a micro-rough structure on the film surface through micron-sized particles, scattering incident light to reduce gloss and avoid optical obstruction caused by excessive film thickness. FA-341 forms a stable colloidal dispersion in a mixed solvent system. At a ratio of 5-10%, the film gloss can be precisely controlled within the optimal range of 20-30 GU for a metallic texture. At the same time, its surface hydroxyl groups can react with silane coupling agents to form a particle-matrix anchoring structure, which not only does not reduce adhesion, but also increases the impact resistance of the film by 15% in the drop ball impact test.

[0051] The aziridine used is XL706 from Starr International Ltd. Starr XL706 contains a multifunctional aziridine structure; its three-membered ring active groups can undergo ring-opening crosslinking reactions with carboxyl and hydroxyl groups in the resin, supplementing the density and uniformity of the polyurethane crosslinking network. In this invention, Starr XL706 forms a synergistic crosslinking system with an organic bismuth drier. Aziridine preferentially reacts with the terminal carboxyl groups of the polyester resin, eliminating the interference of carboxyl groups inhibiting polyurethane crosslinking, thus increasing the crosslinking density by 40% after short-time curing at 75°C. Furthermore, a low ratio of 0.5-5% can achieve crosslinking uniformity control, avoiding the decrease in flexibility caused by excessive local crosslinking, and ensuring no cracks in the 180° bending test.

[0052] The solvent system of component A is formed by 3-10% cyclohexanone, 10-20% toluene, 10-20% methyl ethyl ketone, 20-30% butyl acetate and 20-30% propylene glycol methyl ether acetate. The five solvents are mixed in a specific ratio. By adjusting the solubility parameters and evaporation rate gradient, the uniform dissolution of each solid component and the gradient evaporation of the film-forming process are achieved.

[0053] The solubility parameter is: δ = 9.5-10.5 (cal / cm³)¹ / ²;

[0054] The evaporation rate gradient is as follows: fast-evaporating toluene and methyl ethyl ketone, medium-evaporating butyl acetate, and slow-evaporating cyclohexanone and propylene glycol methyl ether acetate.

[0055] This system utilizes a combination of fast, medium, and slow evaporation gradients to ensure that the coated film first dries rapidly on the surface to prevent sagging, and then slowly dries to form a dense structure, solving the dual problems of sagging in thin coatings and orange peel in thick coatings. Furthermore, the combination of butyl acetate and propylene glycol methyl ether acetate can solubilize the hydrolysis products of silane coupling agents, preventing their self-polymerization and precipitation. At the same time, cyclohexanone can soften micron-level defects on the surface of the optical coating layer, allowing the treatment agent to penetrate and fill the defects, improving adhesion while reducing the surface roughness of the film (Ra≤0.1μm) without affecting the metallic reflective effect.

[0056] The isocyanate trimer used is hexamethylene diisocyanate trimer, specifically Covestro AG's N75. Covestro N75 is a hexamethylene diisocyanate (HDI) trimer containing more than three -NCO functional groups. It can undergo a crosslinking reaction with the hydroxyl groups of the polyester resin in component A to form a three-dimensional network structure, improving the film's density and chemical resistance. At a low A:B ratio of 100:1-5, N75, with the synergistic effect of the organic bismuth drying agent and aziridine, can achieve a crosslinking density ≥1.2×10⁻⁴ mol / cm³. Furthermore, its six-membered ring trimer structure provides a balance of rigidity and elasticity to the film, resisting water vapor penetration and relieving bending stress through molecular chain rotation, increasing the bending resistance from the existing 50 cycles to over 200 cycles.

[0057] Butyl acetate, acting as a diluent for component B, adjusts the viscosity of the isocyanate trimer, ensuring optimal application viscosity when mixed with component A, while also improving the mixing uniformity of the two components. Butyl acetate can form a solvation layer with the silane coupling agent in component A, slowing down its hydrolysis rate and extending the pot life of the A-B mixture from the existing 2 hours to 4 hours, solving the problem of short pot life leading to construction waste in two-component systems. When added at 50%, it also reduces the reactivity of isocyanate, preventing pinholes in the film caused by localized overheating, achieving a balance between high solids content and low exothermic reaction.

[0058] In this invention, the combined use of the silane coupling agent and bispolyester resin enables the interfacial shear bond strength between the treatment agent and the coating layer to reach over 450 kPa, and it can adapt to the complex curved surface coating of 3D molded shells, overcoming the limitation of good adhesion on flat surfaces but poor adhesion on curved surfaces. The combined use of the aziridine and isocyanate trimer solves the problem of adhesion decay under high-temperature boiling water, and ensures that the film layer does not crack during the thermal cycling test from -20℃ to 80℃, overcoming the industry problem of the incompatibility between resistance to damp heat and resistance to high and low temperatures. The combined use of the matte paste and solvent system ensures that the metallic texture retention rate is ≥95% while giving the film layer slight anti-slip properties, reducing the risk of scratches during mobile phone shell assembly, and achieving an unexpected balance between appearance and practicality.

[0059] This invention provides an adhesion treatment agent for optical coating layers on mobile phones made of glass fiber composite materials. The formulations of each embodiment are shown in Table 1 below, the formulations of the comparative examples are shown in Table 2 below, and the performance tests are shown in Table 3 below.

[0060] Table 1: Examples

[0061]

[0062]

[0063] Table 2: Comparative Examples

[0064]

[0065]

[0066]

[0067] Table 3: Performance Test Results

[0068]

[0069]

[0070] Regarding adhesion performance, this invention significantly improves the bonding stability between the treatment agent and the optical coating layer, primer, and topcoat through the combined use of silane coupling agent and bispolyester resin. The cross-cut adhesion of Examples 1-4 is consistently at the optimal level of Grade 0, with interfacial shear bond strength reaching 450-480 kPa, an improvement of 114%-129% compared to existing two-component treatment agents. Even in stress concentration areas of complex curved surfaces on 3D shells, it maintains a strong bond, completely overcoming the industry limitation of good adhesion on planar surfaces but poor adhesion on curved surfaces, and solving the core problem of weak bonding between inorganic coating layers and organic coatings.

[0071] Regarding environmental stability, this invention utilizes a combination of aziridine and isocyanate trimers to construct a dual crosslinking network, increasing the crosslinking density by over 40% and achieving dual compliance with resistance to damp heat and high / low temperatures. The product exhibits no blistering after boiling in 80℃ water for 2 hours, maintaining adhesion at grade 0; adhesion remains unaffected after 72 hours of damp heat aging at 70℃ / 95% RH; and it shows no cracking after 10 cycles of thermal cycling from -20℃ to 80℃. This breakthrough overcomes the industry challenge of achieving both damp heat resistance and high / low temperature resistance simultaneously in existing technologies, significantly improving the long-term reliability of electronic products in complex environments.

[0072] The balance between appearance and mechanical properties is a significant advantage of this invention. The matte paste and solvent system work together to precisely control the gloss of the film within the optimal range of 20-28 GU for metallic texture, with a metallic texture retention rate of ≥95%. At the same time, cyclohexanone in the solvent system can fill micron-level defects on the surface of the coating layer, making the surface roughness of the film layer as low as 0.07-0.10μm, taking into account both aesthetics and tactile feel.

[0073] In terms of mechanical properties, the elastic network structure and crosslinking uniformity control of the bispolyester resin enable the product to withstand 200-230 flexural cycles, which is 300%-360% higher than existing two-component treatment agents. The drop ball impact strength reaches 1.7-2.0J, effectively reducing the risk of scratches and damage during product assembly and use, and achieving a perfect balance between aesthetics and practicality.

[0074] The product's construction and environmental performance are well-suited to the demands of industrial production. The selective catalytic action of the organic bismuth drying agent enables rapid low-temperature curing, requiring only 10-12 minutes of baking at 75℃ to complete curing. This represents a 45℃ reduction in baking temperature and a 50% reduction in time compared to existing technologies, significantly saving energy and eliminating the need to modify existing equipment. The solvation layer formed by butyl acetate and the silane coupling agent slows down hydrolysis, extending the pot life of the mixed components A and B to 3.7-4.0 hours, an 85%-100% improvement over existing two-component treatment agents, reducing construction waste. Furthermore, the product eliminates halogen-containing resin systems, with no detected halogen content, meeting the 3C standards for hazardous substances in coatings and achieving environmental compliance.

[0075] The preferred embodiment 2 has the best overall performance. Its component ratio can maximize the synergistic effect of each component, with an interfacial shear bond strength of 480 kPa, a metallic texture retention rate of 98%, a bending resistance of 230 times, and a mixing application period of 4.0 h. It is the best implementation method that takes into account all performance aspects.

[0076] In summary, this invention achieves multiple breakthroughs in adhesion, stability, appearance and mechanical balance, and construction environmental friendliness through synergistic innovation of components, solving many defects of existing treatment agents. Moreover, it can be applied on a large scale without additional equipment investment, combining technological innovation and industrial practicality.

[0077] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Anyone skilled in the art can readily implement the present invention as shown in the specification and as described above. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the present invention using the disclosed technical content are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, or variations made to the above embodiments based on the essential technology of the present invention are still considered part of the present invention.

Claims

1. An adhesion promoter for optical coating layers on glass fiber composite materials used in mobile phones, characterized in that, It includes component A and component B. Component A, by mass percentage, includes the following components: High molecular weight saturated copolyester resin: 5-15%; Nonionic modified polyester resin: 1-10%; Silane coupling agent: 1-5%; Organic bismuth drying agent: 0.05-0.5%; Matte paste: 5-10%; Aziprodine: 0.5-5%; Cyclohexanone: 3-10%; Toluene: 10-20%; Methyl ethyl ketone: 10-20%; Butyl acetate: 20-30%; Propylene glycol methyl ether acetate: 20-30%; Component B, by mass percentage, includes the following components: Isocyanate trimer: 50-100%; Butyl acetate: 0-50%.

2. The adhesion treatment agent for the optical coating layer of a mobile phone made of glass fiber composite material according to claim 1, characterized in that, The viscosity of this treatment agent is 7.5-7.8 s / 25℃. During construction, mix components A and B in a ratio of 100:(1-5) evenly, and then bake at 75°C for 10-12 minutes to cure after spraying.

3. The adhesion treatment agent for glass fiber composite mobile phone optical coating layer according to any one of claims 1-2, characterized in that, The high molecular weight saturated copolyester resin used is VYLON 270 from Toyobo Co., Ltd. of Japan.

4. The adhesion treatment agent for glass fiber composite mobile phone optical coating layer according to any one of claims 1-3, characterized in that, The nonionic modified polyester resin used is LTW supplied by Evonik Specialty Chemicals (Shanghai) Co., Ltd.

5. The adhesion treatment agent for glass fiber composite mobile phone optical coating layer according to any one of claims 1-4, characterized in that, The silane coupling agent used is glycidyl ether propyltrimethoxysilane, namely CH2CCH2COO(CH2)3Si(OCH3)3.

6. The adhesion treatment agent for glass fiber composite mobile phone optical coating layer according to any one of claims 1-5, characterized in that, The silane coupling agent used is OFS-6040 from Dow Corning (USA).

7. The adhesion treatment agent for glass fiber composite mobile phone optical coating layer according to any one of claims 1-6, characterized in that, The matte finish used is FA-341 from Gifu Chemical New Materials (Nantong) Co., Ltd.

8. The adhesion treatment agent for glass fiber composite mobile phone optical coating layer according to any one of claims 1-7, characterized in that, The aziridine used is XL706 from Starr International Ltd.

9. The adhesion treatment agent for glass fiber composite mobile phone optical coating layer according to any one of claims 1-8, characterized in that, The isocyanate trimer used is hexamethylene diisocyanate trimer.

10. The adhesion treatment agent for glass fiber composite mobile phone optical coating layer according to any one of claims 1-9, characterized in that, The isocyanate trimer used is N75 from Covestro GmbH, Germany.

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