Low-haze glass fiber reinforced epoxy resin light-transmitting composite material and preparation method thereof

Abstract

The invention provides a low-haze glass fiber reinforced epoxy resin light-transmitting composite material and a preparation method thereof. The preparation method comprises the following steps: cleaning and drying glass fibers, infiltrating the glass fibers in silicon dioxide / titanium dioxide composite sol, coating the glass fibers by using a pulling machine, and sintering the glass fibers by using a muffle furnace to obtain anti-reflection film glass fibers; the preparation method comprises the following steps: uniformly mixing epoxy resin, a curing agent and an accelerant, infiltrating and compounding with an anti-reflection film glass fiber, and curing at high temperature to obtain the glass fiber reinforced epoxy resin light-transmitting composite material. By adopting the technical scheme of the invention, the intensity of reflected light of light between an epoxy resin-glass fiber interface in the light-transmitting composite material can be weakened, the light transmittance of visible light of partial wave bands of the glass fiber reinforced light-transmitting composite material is further improved, and the haze of the light-transmitting composite material is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of composite materials, and particularly relates to a low-haze glass fiber reinforced epoxy resin light-transmitting composite material and a preparation method thereof. BACKGROUND

[0002] The glass fiber reinforced epoxy resin-based composite material is a composite material with low density and high specific strength, and different objects can be easily made by using different molds, and the material is one of the materials for making lightweight objects. The epoxy resin as the matrix and the glass fiber as the reinforcing phase both have good optical properties, and the light-transmitting composite material after compounding according to a specific process can become a lightweight substitute for inorganic light-transmitting materials such as glass.

[0003] The optical properties of the light-transmitting composite material are influenced by many factors, including the surface flatness and cleanliness of the material, the optical properties of the matrix and the reinforcing phase, the refractive index difference between the matrix and the reinforcing phase, the shape of the reinforcing phase, and the amount of the reinforcing phase. When other conditions remain unchanged, the light-transmitting property and the haze of the light-transmitting composite material can reach the optimal value by adjusting the refractive index of the matrix to be equal to the refractive index of the reinforcing phase.

[0004] Haze is the percentage of the transmitted light intensity deviating from the incident light by more than 2.5° in the total transmitted light intensity, and the greater the haze, the lower the gloss and the imaging quality of the light-transmitting material. Generally, the refractive indices of the epoxy resin and the glass fiber in the light-transmitting composite material cannot be completely equal, and the diameters of the commonly used glass fibers are greater than the wavelength of visible light, which will cause reflection, scattering and dispersion of light at the epoxy resin-glass fiber interface when the light propagates in the light-transmitting composite material, thereby increasing the haze of the light-transmitting material. If the glass fiber is a glass fiber woven cloth, the transparent composite material will have a more obvious light spot at the position of the cross-stacking of the glass fiber than other areas due to the slight light guiding phenomenon, which will reduce the imaging quality of the material. SUMMARY

[0005] In view of the above problems, the present application discloses a low-haze glass fiber reinforced epoxy resin composite material and a preparation method thereof, which improves the problem of increased haze of the light-transmitting composite material caused by reflection of light at the epoxy resin-glass fiber interface in the prior art.

[0006] The technical scheme is as follows: the acid catalyzed sol-gel method is used to prepare a coating sol, and a drawing method is used to coat an anti-reflection film on the surface of the reinforcing phase, the refractive index of the anti-reflection film is equal to the refractive index of the reinforcing phase, the anti-reflection film can weaken the reflection intensity of part of the visible light at the interface between the epoxy resin and the glass fiber in the light-transmitting composite material by using the destructive interference of light, improve the light transmittance of part of the visible light, and reduce the haze of the light-transmitting composite material as a whole. Since the refractive index of the common glass fiber is 1.45-1.65, the coating material is selected as the composite coating of silicon dioxide / titanium dioxide with the adjustable refractive index in the range of 1.45-2.3.

[0007] To this end, the technical scheme adopted by the present application is as follows:

[0008] A preparation method of a low-haze glass fiber reinforced epoxy resin light-transmitting composite material, comprising the following steps:

[0009] In step S1, the glass fiber is dusted and cleaned to remove the fiber surface wetting agent, and the specific operation is as follows: the glass fiber is blown to remove dust, baked in a muffle furnace at 300-600 DEG C for 0.5-3h, taken out and cleaned with ethanol aqueous solution for 0.5-2h, cleaned for 2-3 times, cleaned with deionized water for 10-30min, cleaned for 2-3 times, and vacuum dried at 90-110 DEG C for 0.5-1h to obtain the pretreated glass fiber.

[0010] In step S2, the silicon source, acid, deionized water and anhydrous ethanol are mixed, dispersed at 60 DEG C under reflux heating for 1-3h, slowly reduced to room temperature after completion, added with anhydrous ethanol, added dropwise with the mixed solution of deionized water and acid, and stirred at room temperature for 0.5-1h to obtain the A liquid.

[0011] In step S3, the titanium source, acid and anhydrous ethanol are mixed, added dropwise into the A liquid, sheared and dispersed for 1-2h, uniformly dispersed, placed in a water bath at 25-40 DEG C for 12h, and aged for 48-120h to obtain the composite sol of silicon dioxide / titanium dioxide.

[0012] In step S4, the pretreated glass fiber is coated by using a drawing machine, the pretreated glass fiber in step S1 is soaked in the composite sol of silicon dioxide / titanium dioxide in step S3 for 10-20min, drawn at a speed of 100-500mm / min, dried at 70 DEG C for 0.5-1h, repeated until the coating thickness reaches the target thickness, transferred to a muffle furnace for sintering at 300-600 DEG C for 0.5-3h, and the anti-reflection film glass fiber is obtained.

[0013] Step S5, after the epoxy resin, curing agent, accelerator are mixed evenly, the anti-reflective film glass fiber is infiltrated and compounded, and the glass fiber reinforced epoxy resin light transmission composite material is obtained by curing at 100-140℃ for 0.5-4h, wherein the mass percentage of the anti-reflective film glass fiber in the glass fiber reinforced epoxy resin light transmission composite material is 30-70%.

[0014] As a further improvement of the present application, in step S1, the glass fiber is one of E-glass fiber and S-glass fiber; the refractive index deviation is ±0.0003. Further, the glass fiber is one of unidirectional glass fiber and woven glass fiber cloth or a combination of two or more thereof.

[0015] As a further improvement of the present application, in step S2, the silicon source is one of tetraethyl orthosilicate, methyl triethoxysilane, dodecyl trimethoxysilane, hexadecyl trimethoxysilane, vinyl triethoxysilane, vinyl trimethoxysilane, vinyl tri(β-methoxyethoxy)silane, γ-aminopropyl triethoxysilane, γ-glycidyl ether propyl trimethoxysilane, γ-methacryloyloxy propyl trimethoxysilane or a combination of two or more thereof.

[0016] As a further improvement of the present application, in step S2 and step S3, the acid is one of hydrochloric acid, nitric acid, acetic acid and other acidic reagents or a combination of two or more thereof.

[0017] As a further improvement of the present application, in step S2, the molar ratio of the silicon source, the acid, the deionized water and the anhydrous ethanol in the A liquid is 1:(0.02-0.5):(1-4):(10-70), and in step S3, the molar ratio of the titanium source, the acid and the anhydrous ethanol is 1:(0.02-0.5):(10-70), and the molar ratio of Si, Ti and anhydrous ethanol in the silica / titania composite sol is (8.5-9.5):(0.5-1.5):400.

[0018] As a further improvement of the present application, in step S3, the titanium source is one of tetrabutyl titanate and titanium tetrachloride.

[0019] As a further improvement of the present application, in step S4, the anti-reflective film glass fiber has a film layer thickness satisfying n1d1=91-138nm, wherein n1 is the refractive index of the anti-reflective film and d1 is the thickness of the anti-reflective film. Further, the anti-reflective film has a single-layer or double-layer structure. Further, the refractive index of the anti-reflective film is ±0.02 of the refractive index of the glass fiber in step S1.

[0020] As a further improvement of the present application, in step S5, the refractive index of the epoxy resin is 1.45-1.61, colorless and transparent or light yellow transparent. Further, the refractive index of the cured epoxy resin is ±0.02 of the refractive index of the glass fiber in step S1.

[0021] As a further improvement of the present application, in step S5, the epoxy resin is bisphenol A epoxy resin, hydrogenated epoxy resin, alicyclic epoxy resin, phenolic epoxy resin, and the mass fraction of the epoxy resin and curing agent, accelerator is respectively: bisphenol A epoxy resin 10-40 parts, hydrogenated epoxy resin 30-85 parts, alicyclic epoxy resin 0-40, phenolic epoxy resin 0-40 parts, curing agent 0.3-40 parts, accelerator 0-4 parts.

[0022] Further, the curing agent is one or more than two combinations of dicyandiamide, ethylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine, diamine diphenyl sulfone, methyl hexahydrophthalic anhydride, isophorone diamine, m-xylylenediamine, polyether amine, hexafluoroantimonate, phosphate, diphenyl sulfonium salt, triphenyl sulfonium salt.

[0023] Further, the accelerator is one or more than two combinations of boron trifluoride ethylamine, 2,4,6-tris(dimethylaminomethyl)phenol, benzyl dimethyl amine, 2-methyl imidazole.

[0024] Compared with the prior art, the present application has the following advantages:

[0025] First, the technical scheme of the present application improves the light transmittance of the glass fiber reinforced light transmission composite material and reduces the haze. Specifically, an anti-reflection coating is pre-coated on the surface of the glass fiber, the refractive index of the epoxy resin, the refractive index of the glass fiber and the refractive index of the transition interface between the epoxy resin and the glass fiber are adjusted to be nearly equal, the number of times and light intensity of the diffuse reflection and scattering of the light in the epoxy resin-glass fiber interface during the propagation of the light in the light transmission composite material are reduced, and the reflected light intensity of the light in the epoxy resin-glass fiber interface in the light transmission composite material is further weakened through the destructive interference of the anti-reflection film, thereby realizing the increase of the light transmittance and the decrease of the haze of the light transmission composite material.

[0026] Second, the technical scheme of the present application uses tetraethyl orthosilicate and silane coupling agent as the silicon source of the silica / titanium dioxide composite sol, which can coat a high-surface-energy coating on the surface of the glass fiber, improve the wetting effect of the resin matrix and the glass fiber of the light transmission composite material, and reduce the defects caused by poor wetting between the resin matrix and the glass fiber.

[0027] Third, the technical scheme of the present application has a wide adjustable range of the refractive index of the silica / titanium dioxide composite anti-reflection coating, which can be adapted to glass fibers with different refractive indexes as needed, and has a wide range of applications. DETAILED DESCRIPTION

[0028] Example 1

[0029] A glass fiber reinforced epoxy resin light-transmitting composite material comprises the following components by weight fraction: epoxy resin matrix 55 parts, glass fiber 45 parts.

[0030] The epoxy resin matrix comprises the following components by weight fraction: bisphenol A epoxy resin 20 parts, hydrogenated epoxy resin 60 parts, alicyclic epoxy resin 20 parts, hexafluoroantimonate 0.6 parts.

[0031] The glass fiber is surface treated by the following steps:

[0032] (1) The E-glass fiber woven cloth is blown to remove dust, baked in a muffle furnace at 400℃ for 2h, taken out and ultrasonically cleaned with an ethanol aqueous solution for 0.5h, cleaned twice, ultrasonically cleaned with deionized water for 10min, cleaned twice, and vacuum dried at 90℃ for 0.5h to obtain pretreated glass fiber.

[0033] (2) Methyl triethoxysilane 7.328 parts, hydrochloric acid 0.001 part, deionized water 0.794 parts, and anhydrous ethanol 5.680 parts are mixed and dispersed at 60℃ under reflux for 2h, then slowly reduced to room temperature, added to 64.288 parts of anhydrous ethanol, and dropped with a mixture of 0.841 parts of deionized water and 0.032 parts of hydrochloric acid, stirred at room temperature for 0.5h to obtain A liquid.

[0034] (3) Tetrabutyl titanate 1.463 parts, acetic acid 0.129 parts, and anhydrous ethanol 13.695 parts are mixed and dropped into A liquid for shearing dispersion for 2h, then dispersed in a 30℃ water bath for 12h, and aged for 96h to obtain a silica / titanium dioxide composite sol.

[0035] (4) The pretreated glass fiber in (1) is soaked in the silica / titanium dioxide composite sol for 15min, pulled up at a speed of 400mm / min, dried at 70℃ for 0.5h, and repeated for 3 times, then transferred to a muffle furnace for sintering at 500℃ for 2h to obtain anti-reflection film glass fiber.

[0036] (5) Bisphenol A epoxy resin 10 parts, hydrogenated epoxy resin 60 parts, alicyclic epoxy resin 30 parts, and hexafluoroantimonate 0.5 parts are uniformly mixed, then infiltrated and compounded with the anti-reflection film glass fiber in (4), and cured at 120℃ for 1h to obtain a glass fiber reinforced epoxy resin light-transmitting composite material.

[0037] Example 2

[0038] A glass fiber reinforced epoxy resin light-transmitting composite material comprises the following components by weight: 55 parts of an epoxy resin matrix and 45 parts of glass fiber.

[0039] The epoxy resin matrix comprises the following components by weight: 60 parts of bisphenol A epoxy resin, 40 parts of hydrogenated epoxy resin, 5 parts of dicyandiamide curing agent and 1 part of 2-methyl imidazole accelerator.

[0040] The glass fiber is surface treated by the following steps:

[0041] (1) The E-glass fiber woven cloth is blown to remove dust, baked in a muffle furnace at 400℃ for 2h, taken out and cleaned with ethanol aqueous solution for 0.5h, cleaned twice, cleaned with deionized water for 10min, cleaned twice, and vacuum dried at 90℃ for 0.5h to obtain pretreated glass fiber.

[0042] (2) Methyl triethoxysilane 7.328 parts, hydrochloric acid 0.001 part, deionized water 0.794 parts, and anhydrous ethanol 5.680 parts are mixed and dispersed at 60℃ under reflux for 2h, then slowly reduced to room temperature, added to 64.288 parts of anhydrous ethanol, and dropped with a mixture of 0.841 parts of deionized water and 0.032 parts of hydrochloric acid, stirred at room temperature for 0.5h to obtain A liquid.

[0043] (3) Tetrabutyl titanate 1.463 parts, acetic acid 0.129 parts, and anhydrous ethanol 13.695 parts are mixed and dropped into A liquid for shearing dispersion for 2h, then placed in a 30℃ water bath for dispersion for 12h, and aged for 96h to obtain silica / titanium dioxide composite sol.

[0044] (4) The pretreated glass fiber in (1) is soaked in the silica / titanium dioxide composite sol for 15min, pulled up at a speed of 400mm / min, dried at 70℃ for 0.5h, repeated for 3 times, transferred to a muffle furnace for sintering at 500℃ for 2h to obtain anti-reflection film glass fiber.

[0045] (5) Bisphenol A epoxy resin 60 parts, hydrogenated epoxy resin 40 parts, dicyandiamide curing agent 5 parts, and 2-methyl imidazole accelerator 1 part are uniformly mixed, and then infiltrated and combined with the anti-reflection film glass fiber in (4),

[0046] Cured at 120℃ for 1h to obtain a glass fiber reinforced epoxy resin light-transmitting composite material.

[0047] Example 3

[0048] A glass fiber reinforced epoxy resin light-transmitting composite material comprises the following components by weight: 55 parts of an epoxy resin matrix and 45 parts of glass fiber.

[0049] The epoxy resin matrix comprises the following components by weight fraction: bisphenol A epoxy resin 10 parts, hydrogenated epoxy resin 60 parts, phenolic epoxy resin 30 parts, dicyandiamide curing agent 5 parts, 2-methyl imidazole accelerator 1 part.

[0050] The glass fiber is surface treated by the following steps:

[0051] (1) The E-glass fiber woven cloth is blown to remove dust, baked in a muffle furnace at 400℃ for 2h, taken out and cleaned with ethanol aqueous solution for 0.5h, cleaned twice, cleaned with deionized water for 10min, cleaned twice, and vacuum dried at 90℃ for 0.5h to obtain pretreated glass fiber.

[0052] (2) Methyl triethoxysilane 7.328 parts, hydrochloric acid 0.001 part, deionized water 0.794 parts, and anhydrous ethanol 5.680 parts are mixed and dispersed at 60℃ under reflux heating for 2h, then slowly reduced to room temperature, added to 64.288 parts of anhydrous ethanol, and dropped with a mixture of 0.841 parts of deionized water and 0.032 parts of hydrochloric acid, stirred at room temperature for 0.5h to obtain A liquid.

[0053] (3) Tetrabutyl titanate 1.463 parts, acetic acid 0.129 parts, and anhydrous ethanol 13.695 parts are mixed and dropped into A liquid for shearing dispersion for 2h, then placed in a 30℃ water bath for dispersion for 12h, and aged for 96h to obtain silica / titanium dioxide composite sol.

[0054] (4) The pretreated glass fiber in (1) is soaked in the silica / titanium dioxide composite sol for 15min, pulled up at a speed of 400mm / min, dried at 70℃ for 0.5h, and repeated for 3 times, then transferred to a muffle furnace for sintering at 500℃ for 2h to obtain anti-reflection film glass fiber.

[0055] (5) Bisphenol A epoxy resin 10 parts, hydrogenated epoxy resin 60 parts, phenolic epoxy resin 30 parts, dicyandiamide curing agent 5 parts, and 2-methyl imidazole accelerator 1 part are uniformly mixed, then infiltrated and compounded with the anti-reflection film glass fiber in (4), and cured at 120℃ for 1h to obtain glass fiber reinforced epoxy resin light transmission composite material.

[0056] Comparative Example 1

[0057] This comparative example is a control experiment based on Example 1, and the glass fiber is not coated in Comparative Example 1.

[0058] A glass fiber reinforced epoxy resin light transmission composite material comprises the following components by weight fraction: epoxy resin matrix 55 parts, and glass fiber 45 parts.

[0059] The epoxy resin matrix comprises the following components by weight parts: bisphenol A epoxy resin 20 parts, hydrogenated epoxy resin 60 parts, alicyclic epoxy resin 20 parts, hexafluoroantimonate 0.6 parts.

[0060] The glass fiber is surface treated by the following steps:

[0061] (1) The E-glass fiber woven cloth is blown to remove dust, baked in a muffle furnace at 400℃ for 2h, then taken out and cleaned with ethanol aqueous solution for 0.5h, cleaned twice, cleaned with deionized water for 10min, cleaned twice, and vacuum dried at 90℃ for 0.5h to obtain pretreated glass fiber.

[0062] (2) Bisphenol A epoxy resin 20 parts, hydrogenated epoxy resin 60 parts, alicyclic epoxy resin 20 parts, and hexafluoroantimonate 0.6 parts are uniformly mixed, then infiltrated and compounded with the pretreated glass fiber of (1), and cured at 120℃ for 1h to obtain a glass fiber reinforced epoxy resin light-transmitting composite material.

[0063] The glass fiber reinforced epoxy resin light-transmitting composite materials of Examples 1-3 and Comparative Example 1 are subjected to optical performance detection, and the sample thickness is 0.4mm. The light transmittance and haze are tested according to the standard test of “Determination of Light Transmittance and Haze of Transparent Plastics” (GB / T 2410-2008), and the results are shown in Table 1. In addition, the light transmittance of the glass fiber reinforced epoxy resin light-transmitting composite materials of Examples 1-3 is above 88.5%, and the haze is above 7.5. It can be seen that the glass fiber reinforced epoxy resin light-transmitting composite material prepared by the technical scheme of the present application has higher light transmittance and lower haze.

[0064] Table 1

[0065] Composite thickness / mm Light transmission / % Haze / % Example 1 0.40 89.2 5.5 Example 2 0.37 88.5 7.0 Example 3 0.42 88.5 7.5 Comparative Example 1 0.40 83.4 15.6

[0066] The above is a further detailed description of the present application in combination with specific preferred embodiments, and the specific implementation of the present application should not be limited to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, some simple deductions or substitutions can be made without departing from the concept of the present application, and all of them should be regarded as falling within the protection scope of the present application.

Claims

1. A low haze glass fiber reinforced epoxy resin light transmitting composite material, characterized in that, The preparation method comprises the following steps: Step S1, the glass fiber is cleaned and washed to remove the fiber surface wetting agent, the specific operation is: the glass fiber is blown and cleaned, baked in a muffle furnace at 300-600℃ for 0.5-3h, then taken out and cleaned with ethanol aqueous solution for 0.5-2h, cleaned for 2-3 times, cleaned with deionized water for 10-30min, cleaned for 2-3 times, vacuum dried at 90-110℃ for 0.5-1h, and the pretreated glass fiber is obtained. Step S2, the silicon source, acid, deionized water and anhydrous ethanol are mixed, and dispersed at 60℃ under reflux heating for 1-3h, then slowly reduced to room temperature, added with anhydrous ethanol dispersion, added dropwise with the mixed solution of deionized water and acid, and stirred at room temperature for 0.5-1h, and the A liquid is obtained. Step S3, the titanium source, acid and anhydrous ethanol are mixed, and added dropwise into the A liquid for shearing dispersion for 1-2h, then placed in a water bath at 25-40℃ for dispersion for 12h, and aged for 48-120h, and the silica / titanium dioxide composite sol is obtained. Step S4, the pretreated glass fiber is coated by a pulling machine, the pretreated glass fiber in step S1 is soaked in the silica / titanium dioxide composite sol for 10-20min, pulled at a speed of 100-500mm / min, dried at 70℃ for 0.5-1h, and the operation is repeated until the coating thickness reaches the target thickness, then transferred to a muffle furnace for sintering at 300-600℃ for 0.5-3h, and the anti-reflection film glass fiber is obtained. Step S5, the epoxy resin, curing agent and accelerator are uniformly dispersed and mixed, then soaked and compounded with the anti-reflection film glass fiber in step S2, and cured at 100-140℃ for 0.5-4h, and the glass fiber reinforced epoxy resin light transmission composite material is obtained, wherein the mass percentage of the anti-reflection film glass fiber in the glass fiber reinforced epoxy resin light transmission composite material is 30-70%.

2. The process for the production of low haze glass fiber reinforced epoxy resin light transmitting composites according to claim 1, characterized in that: In step S1, the glass fiber is one of E-glass fiber and S-glass fiber, and the refractive index deviation is ±0.0003. Further, the glass fiber is one of unidirectional glass fiber and woven glass fiber cloth or a combination of two or more thereof.

3. The process for producing a low haze glass fiber reinforced epoxy resin light transmitting composite material according to claim 1, characterized in that: In step S2, the silicon source is one of tetraethyl orthosilicate, methyl triethoxysilane, dodecyl trimethoxysilane, hexadecyl trimethoxysilane, vinyl triethoxysilane, vinyl trimethoxysilane, vinyl tri(β-methoxyethoxy)silane, γ-aminopropyl triethoxysilane, γ-glycidyl ether propyl trimethoxysilane and γ-methacryloyl propyl trimethoxysilane or a combination of two or more thereof.

4. The method for preparing the low-haze glass fiber reinforced epoxy resin light-transmitting composite material according to claim 1, characterized in that: In step S2 and step S3, the acid is one of hydrochloric acid, nitric acid, acetic acid and other acidic reagents or a combination of two or more thereof.

5. The method for preparing the low-haze glass fiber reinforced epoxy resin light-transmitting composite material according to claim 1, characterized in that: In step S2, the molar ratio of the silicon source, acid, deionized water, and anhydrous ethanol in the A liquid is 1:(0.02-0.5):(1-4):(10-70), and in step S3, the molar ratio of the titanium source, acid, and anhydrous ethanol is 1:(0.02-0.5):(10-70), and the molar ratio of Si, Ti, and anhydrous ethanol in the silica / titania composite sol is (8.5-9.5):(0.5-1.5):

400.

6. The process for producing a low haze glass fiber reinforced epoxy resin light transmitting composite material according to claim 1, characterized in that: In step S3, the titanium source is one of tetrabutyl titanate and titanium tetrachloride.

7. The process for producing a low haze glass fiber reinforced epoxy resin light transmitting composite material according to claim 1, characterized in that: In step S4, the anti-reflection film glass fiber has a film layer thickness that satisfies n1d1=91-138 nm, where n1 is the refractive index of the anti-reflection film and d1 is the thickness of the anti-reflection film. Further, the refractive index of the anti-reflection film is ±0.02 of the refractive index of the glass fiber in step S1.

8. The process for producing a low haze glass fiber reinforced epoxy resin light transmitting composite material according to claim 1, characterized in that: In step S5, the refractive index of the epoxy resin is 1.45-1.61, and the epoxy resin is colorless and transparent or light yellow and transparent. Further, the refractive index of the cured epoxy resin is ±0.02 of the refractive index of the glass fiber in step S1.

9. The process for producing a low haze glass fiber reinforced epoxy resin light transmitting composite material according to claim 1, characterized in that: In step S5, the epoxy resin is bisphenol A epoxy resin, hydrogenated epoxy resin, alicyclic epoxy resin, and phenolic epoxy resin, and the mass fraction of the epoxy resin and curing agent and accelerator is respectively: bisphenol A epoxy resin 10-40 parts, hydrogenated epoxy resin 30-80 parts, alicyclic epoxy resin 0-40 parts, phenolic epoxy resin 0-40 parts, curing agent 0.3-40 parts, and accelerator 0-4 parts.

10. The method for preparing the low-haze glass fiber reinforced epoxy resin light-transmitting composite material according to claim 1, characterized in that: In step S5, the curing agent is one or a combination of two or more of dicyandiamide, ethylenediamine, hexamethylenediamine, diethylenetriamine, triethylenetetramine, diamine-based diphenyl sulfone, methylhexahydrophthalic anhydride, isophorone diamine, m-xylylenediamine, polyether amine, hexafluoroantimonate, phosphate, diphenyl sulfonium salt, and triphenyl sulfonium salt.

11. The method for preparing the low-haze glass fiber reinforced epoxy resin light-transmitting composite material according to claim 1, characterized in that: In step S5, the accelerator is one or a combination of two or more of boron trifluoride ethylamine, 2,4,6-tris(dimethylaminomethyl)phenol, benzyl dimethyl amine, and 2-methylimidazole.