Ultraviolet light-cured fiber material and its preparation method and construction process

Abstract

The application belongs to the technical field of tunnel reinforcement, and particularly relates to ultraviolet light curing fiber material and a preparation method and construction process thereof. The preparation raw materials of the ultraviolet light curing fiber material include ultraviolet light sensitive resin liquid and glass fiber; the ultraviolet light sensitive resin liquid is composed of A material and B material, the A material includes the following components in parts by weight: bisphenol A type epoxy resin 38-40 parts, trimethylolpropane triacrylate 27-30 parts, 2,4-dihydroxybenzophenone 1.6-2 parts and hydroquinone 0.85-1 part; the B material includes the following components in parts by weight: silicone rubber 1-5 parts and nano silicon dioxide 1-5 parts. The raw materials cooperate with and influence each other in a specific dosage range, synergistically enhance the strength and toughness of the ultraviolet light curing fiber material, effectively improve the curing speed of the material, and can be quickly sprayed and reinforced on the cracked lining of the tunnel, truly realize the second-level curing, and effectively improve the construction rescue speed.

Description

Technical Field

[0001] This invention belongs to the field of tunnel reinforcement technology, specifically relating to an ultraviolet light-cured fiber material and its preparation method and construction process. Background Technology

[0002] Long and challenging undersea tunnels represent one of the emerging and most difficult directions in my country's future tunnel engineering construction. Undersea tunnels face a complex environment characterized by unlimited overlying seawater supply, complex and variable geological structures, intense high-salt and high-permeability erosion, and active seismic activity around the Pacific Ocean. Due to the influence of static and dynamic forces, chemical erosion, and other adverse factors, lining damage and cracking are prominent issues during tunnel operation, easily triggering sudden water inrush accidents. The unlimited supply of seawater significantly increases the difficulty of handling such accidents. Therefore, the principle of "prevention first" and "early detection and early repair" should be followed when addressing cracks and leaks in undersea tunnels. Rapid integrated waterproofing and reinforcement repairs should be carried out at the early stage of crack appearance to prevent the deterioration of the damage.

[0003] For early-stage cracks in tunnel linings, the industry commonly uses thermosetting epoxy resin bonded with thin steel strips or fiber cloth for rapid repair. However, ordinary thermosetting epoxy resin adhesives have a long curing period, typically requiring at least 24 hours to fully cure and bond. During this slow curing process, water seepage from the cracks can easily penetrate the bonding interface, reducing bond strength and leading to debonding failure, thus failing to achieve rapid reinforcement. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the prior art and provide a method for preparing and constructing ultraviolet-cured fiber materials, thereby achieving a more environmentally friendly, high-strength, and effective reinforcement of tunnel surfaces that is easy to construct over a wide area without air gaps.

[0005] To achieve the above objectives, the technical solution adopted by the present invention includes:

[0006] In a first aspect, the present invention provides an ultraviolet-cured fiber material for tunnel reinforcement, wherein the raw materials for preparing the ultraviolet-cured fiber material include ultraviolet photosensitive resin liquid and glass fiber;

[0007] The ultraviolet photosensitive resin liquid is composed of component A and component B. Component A includes the following parts by weight: 38-40 parts of bisphenol A epoxy resin, 27-30 parts of trimethylolpropane triacrylate, 1.6-2 parts of 2,4-dihydroxybenzophenone, and 0.85-1 parts of hydroquinone. Component B includes the following parts by weight: 1-5 parts of silicone rubber and 1-5 parts of nano-silica.

[0008] Bisphenol A type epoxy resin is a basic prepolymer containing epoxy groups and acrylate groups. It forms a cross-linked network through photo-initiated polymerization and cross-linking, which can be rapidly molded and cured. It has high viscosity and strength, giving the material higher strength and durability. Its dosage significantly affects the cross-linking density and hardness of the material.

[0009] Trimethylolpropane triacrylate (TMT) is a compound with polyacrylate groups that exhibits a higher crosslinking speed and lower viscosity compared to bisphenol A type epoxy resins. In UV-curable materials, TMT can provide crosslinking points, increasing the material's strength and abrasion resistance. Simultaneously, the amount of TMT can affect the material's flowability and crosslinking density; higher TMT content leads to increased flowability but may negatively impact abrasion resistance.

[0010] 2,4-Dihydroxybenzophenone, as a photoinitiator, has good absorption of ultraviolet light and can generate highly active free radicals or ions, thereby promoting the photopolymerization reaction of the acryloyl groups of bisphenol A epoxy resin and trimethylolpropane triacrylate to achieve rapid curing. Moreover, it produces almost no waste gas and has little odor during the curing process. In addition, the amount of 2,4-dihydroxybenzophenone directly affects the photoinitiation efficiency. If the amount is too high, it may lead to over-initiation, causing side reactions and affecting the material properties.

[0011] UV-curable materials may come into contact with oxygen or other oxides during preparation and application, which can easily cause oxidation reactions and reduce the performance of the materials. Hydroquinone, as a stabilizer, can effectively inhibit the initiation of oxygen and reduce the generation of free radicals, thus helping to inhibit or delay the oxidation reaction of the materials. The amount of hydroquinone added should be moderate. Excessive amount may inhibit the activity of the initiator and thus have a negative impact on the curing speed.

[0012] Silicone rubber can bond well with other material surfaces, enhancing the adhesion of materials and improving their adhesion performance on different substrates, thereby significantly improving the shear strength and peel strength of materials; nano silica has high hardness and excellent mechanical strength, and can form a network structure in photocurable materials, increasing the viscosity and rheological properties of materials, and playing a role in toughening and strengthening during the curing process of resin materials.

[0013] Glass fiber is a high-strength and high-rigidity fiber material that can further improve the strength and rigidity of photocurable materials. Due to its good light transmittance and gloss, it does not absorb ultraviolet light. When added to photosensitive resin liquid, it has minimal impact on the curing speed and degree, but can effectively enhance the post-curing performance of mixed fiber photocurable materials.

[0014] This invention prepares a UV-curable fiber material from the above-mentioned raw materials. Within a specific dosage range, the raw materials cooperate and influence each other to synergistically enhance the strength and toughness of the material, while effectively improving the curing speed. The prepared material can be rapidly sprayed to reinforce cracked tunnel linings, overcoming the shortcomings of long curing and molding time in traditional fiber concrete reinforcement, and truly achieving second-level curing and rapid reinforcement.

[0015] Preferably, the mass ratio of material A to material B is material A: material B = (8.5-9): (1-1.5).

[0016] Different ratios of component A and component B will cause changes in the viscosity of the UV-sensitive resin liquid prepared by mixing the two, thus affecting its spraying effect. Ultimately, after UV curing, it will significantly affect the strength and rigidity of the UV-cured material. Furthermore, different ratios of component A and component B may lead to different curing speeds, thereby affecting production efficiency and curing uniformity. Experimental research has found that when the mass ratio of component A to component B is within the preferred range of A:B = (8.5-9):(1-1.5), the prepared UV-sensitive resin liquid has better coating performance and rheological properties. The UV-cured fiber material obtained after spraying can achieve better reinforcement effect and has a faster curing speed.

[0017] Preferably, the mass ratio of material A to material B is 9:1.

[0018] Experimental research revealed that when the optimal mass ratio of material A to material B is 9:1, the resulting UV-cured fiber material exhibits strong reinforcement and rapid curing, effectively improving the efficiency of emergency rescue operations.

[0019] Preferably, the mass content of the glass fiber is 10-15% based on the volume of the ultraviolet photosensitive resin liquid.

[0020] Experimental research has shown that when the mass content of glass fiber is 10-15%, the strength of the photocurable material can be significantly improved, and the wear resistance of the material can be increased.

[0021] Preferably, the glass fiber has a length of 40-60 mm and a diameter of 12-15 μm.

[0022] Preferably, the glass fiber comprises the following chemical composition by weight percentage: SiO2 61%, CaO 4.8%, Na2O 2.6%, ZrO2 14.5%, TiO2 5.88%, Al2O3 0.55%, Fe2O3 0.22%.

[0023] Secondly, the present invention provides a method for preparing the above-mentioned ultraviolet-curable fiber material, characterized by comprising the following steps:

[0024] (1) Mix the bisphenol A type epoxy resin and trimethylolpropane triacrylate, stir for 5-10 min at a stirring speed of 50-70 rpm / min, let stand for 5-10 min, then add 2,4-dihydroxybenzophenone and hydroquinone, stir for 10-15 min at a stirring speed of 50-70 rpm / min to obtain the A material;

[0025] (2) Mix silicone rubber and nano-silica to obtain material B;

[0026] (3) Add material B to material A, stir for 8-12 minutes, let stand for 25-35 minutes for defoaming treatment, and obtain ultraviolet photosensitive resin liquid;

[0027] (4) Add glass fiber to the UV photosensitive resin liquid in step (3), stir for 8-12 minutes at a stirring speed of 40-50 rpm / min, and let stand for 25-35 minutes to defoam, and then obtain the UV-curable fiber material.

[0028] Preferably, the preparation process of step (4) is carried out in a weak ultraviolet environment or in the dark.

[0029] The preparation method of the UV-curable fiber material described in this invention is simple, the photosensitive raw materials used are safe and non-toxic, and have stable chemical properties. They are easy to store and transport, and do not require on-site preparation, which effectively improves the speed of construction and emergency rescue.

[0030] Thirdly, the present invention also provides a construction process for ultraviolet-cured fiber materials, comprising the following steps:

[0031] (1) Clean the tunnel surface: Clean the surface of the tunnel lining, remove the loose layer and impurities, expose the clean concrete interface, grind it smooth, remove the surface dust, and dry it.

[0032] (2) Spraying reinforcement: The ultraviolet curing fiber material is sprayed onto the surface of the tunnel lining using a spraying equipment, and then cured by irradiation under ultraviolet light.

[0033] Preferably, in step (2), the wavelength of the ultraviolet light is 365nm and the illumination power is 500-1000w.

[0034] Preferably, in step (2), the ultraviolet light irradiation time is 5-10 min.

[0035] Preferably, in step (2), the spraying equipment has a conveying capacity of 1-25 L / min for UV-cured fiber materials.

[0036] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0037] 1. This invention mixes glass fiber filaments with photosensitive resin base liquid to achieve one-time spraying. After curing, the fibers quickly connect and interweave, effectively improving the strength of the reinforcement layer and thus effectively enhancing the load-bearing capacity of the tunnel lining. The UV-curable fiber material prepared by this invention has a tensile strength of 40-45 MPa and a Brinell hardness of 85D after resin curing, which plays an effective role in strengthening and reinforcing the tunnel structure.

[0038] 2. The photosensitive material used in this invention is safe and non-toxic. Within a specific dosage range, the raw materials work together and influence each other to synergistically enhance the strength and toughness of the UV-curable material. At the same time, it effectively improves the curing speed of the material, truly achieving second-level curing and rapid reinforcement. Furthermore, the addition of stabilizers stabilizes its chemical properties, which is beneficial for storage, transportation, and rapid reinforcement in engineering projects. It does not require on-site preparation and use, thus improving the speed of construction and emergency rescue.

[0039] 3. The UV-curable fiber material prepared by this invention is simple and quick in terms of construction process. It adopts spraying equipment for air spraying and air curing, forming in one step and quick construction, saving manpower and crane and support construction costs, facilitating large-scale construction, and achieving seamless connection between spraying and curing processes in terms of time. Attached Figure Description

[0040] Figure 1 The tensile strength diagram and bond (shear) strength diagram of the UV-cured fiber material prepared in Example 1 after being sprayed onto the concrete surface are shown.

[0041] Figure 2 Figure A shows the tensile test specimen (Figure A) and the interfacial bond (shear) strength test specimen (Figure B) of the UV-cured fiber material prepared in Example 1.

[0042] Figure 3 These are images of samples cut from the UV-curable fiber materials prepared in Examples 2-5 after spraying and curing.

[0043] Figure 4 The images show the samples cut from the UV-curable fiber materials prepared in Comparative Examples 1-4 after spraying and curing. Detailed Implementation

[0044] To better illustrate the objectives, technical solutions, and advantages of this invention, the invention will be further described below with reference to specific embodiments. Those skilled in the art should understand that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0045] Raw material information:

[0046] Material A: Bisphenol A type epoxy resin was purchased from Vigru Polymer Materials (Suzhou) Co., Ltd.; Trimethylolpropane triacrylate, 2,4-dihydroxybenzophenone, and hydroquinone were all purchased from Guangzhou Jingyi New Materials Co., Ltd.

[0047] Material B: Silicone rubber and nano-silica were both purchased from Hubei Huifu Nanomaterials Co., Ltd.

[0048] The glass fiber was purchased from China Jushi Co., Ltd. (Chengdu), with a moisture content of <0.15% (GB / T9914.1-2001) and an adhesion rate of 1.65±0.15% (GB / T9914.2-2001).

[0049] Example 1

[0050] This embodiment provides a method for preparing ultraviolet-cured fiber materials for tunnel reinforcement, including the following steps:

[0051] (1) Mix 38 parts of bisphenol A type epoxy resin and 27 parts of trimethylolpropane triacrylate, stir for 5 min at a stirring speed of 50 rpm / min, let stand for 5-10 min, then add 1.6 parts of 2,4-dihydroxybenzophenone and 0.85 parts of hydroquinone, stir for 10 min at a stirring speed of 50 rpm / min to obtain the A material;

[0052] (2) Mix 1 part silicone rubber and 1 part nano silica to obtain the B material;

[0053] (3) Add material B to material A. The mass ratio of liquid A to liquid B is 9:1. Stir for 8 minutes and let stand for 25 minutes to defoam, and obtain ultraviolet photosensitive resin liquid.

[0054] (4) Add glass fiber with a length of 40 mm to the ultraviolet photosensitive resin liquid in step (3) with a mass doping amount of 10%, stir for 8 min at a stirring speed of 40 rpm / min, and let stand for 25 min to defoam, and the ultraviolet curable fiber material is obtained.

[0055] Example 2

[0056] This embodiment provides a method for preparing ultraviolet-cured fiber materials for tunnel reinforcement, which differs from Embodiment 1 in that:

[0057] In step (1), 40 parts of bisphenol A epoxy resin, 30 parts of trimethylolpropane triacrylate, 2 parts of 2,4-dihydroxybenzophenone, and 1 part of hydroquinone are added; in step (2), 5 parts of silicone rubber and 5 parts of nano silica are added; the remaining conditions remain unchanged.

[0058] Example 3

[0059] This embodiment provides a method for preparing ultraviolet-cured fiber materials for tunnel reinforcement, which differs from Embodiment 1 in that:

[0060] In step (3), the mass ratio of liquid A to liquid B is 8.5:1, and the other conditions remain unchanged.

[0061] Example 4

[0062] This embodiment provides a method for preparing ultraviolet-cured fiber materials for tunnel reinforcement, which differs from Embodiment 1 in that:

[0063] In step (3), the mass ratio of liquid A to liquid B is 9:1.5, and the other conditions remain unchanged.

[0064] Example 5

[0065] This embodiment provides a method for preparing ultraviolet-cured fiber materials for tunnel reinforcement, which differs from Embodiment 1 in that:

[0066] In step (4), the mass content of glass fiber is 15%, and the other conditions remain unchanged.

[0067] Example 6

[0068] This embodiment provides a method for preparing ultraviolet-cured fiber materials for tunnel reinforcement, including the following steps:

[0069] (1) Mix 38 parts of bisphenol A type epoxy resin and 27 parts of trimethylolpropane triacrylate, stir for 10 min at a stirring speed of 70 rpm / min, let stand for 5-10 min, then add 1.6 parts of 2,4-dihydroxybenzophenone and 0.85 parts of hydroquinone, stir for 15 min at a stirring speed of 70 rpm / min to obtain the A material;

[0070] (2) Mix 1 part of silicone rubber with 1 part of nano-silica to obtain the B material;

[0071] (3) Add material B to material A. The mass ratio of liquid A to liquid B is 9:1. Stir for 12 minutes and let stand for 35 minutes to defoam, and obtain photosensitive resin liquid.

[0072] (4) Add glass fiber with a length of 60 mm to the photosensitive resin liquid in step (3) with a mass content of 10%, stir for 12 min at a stirring speed of 50 rpm / min, and let stand for 35 min to defoam, and the ultraviolet curable fiber material is obtained.

[0073] Comparative Example 1

[0074] The difference between this comparative example and Example 1 is that in step (3), the mass ratio of liquid A to liquid B is 8:1, and the other conditions remain unchanged.

[0075] Comparative Example 2

[0076] The difference between this comparative example and Example 1 is that in step (3), the mass ratio of liquid A to liquid B is 9:2, and the other conditions remain unchanged.

[0077] Comparative Example 3

[0078] The difference between this comparative example and Example 1 is that no glass fiber is added in this comparative example, while the other conditions remain the same.

[0079] Comparative Example 4

[0080] The difference between this comparative example and Example 1 is that:

[0081] In step (1), 35 parts of bisphenol A type epoxy resin and 2.5 parts of 2,4-dihydroxybenzophenone were added; the other conditions remained unchanged.

[0082] Comparative Example 5

[0083] The difference between this comparative example and Example 1 is that:

[0084] In step (1), 35 parts of trimethylolpropane triacrylate and 1.5 parts of hydroquinone were used; the other conditions remained unchanged.

[0085] Comparative Example 6

[0086] The difference between this comparative example and Example 1 is that:

[0087] In step (2), 0.5 parts of silicone rubber and 7 parts of nano silica are added; the other conditions remain unchanged.

[0088] Comparative Example 7

[0089] The difference between this comparative example and Example 1 is that in step (4), the mass content of glass fiber is 20%, and the other conditions remain unchanged.

[0090] Experimental Example 1

[0091] This experimental example uses the UV-cured fiber materials prepared in Examples 1-6 and Comparative Examples 1-7 as samples to provide a construction process for their use in tunnel reinforcement, including the following steps:

[0092] (1) Clean the tunnel surface: Clean the tunnel lining surface, remove the loose layer and impurities, expose the clean concrete interface, grind it smooth, and remove the surface dust; if the construction environment has high humidity or the concrete bonding surface is damp, the bonding surface should be dried.

[0093] (2) Spraying reinforcement: The UV-curable fiber materials prepared in Examples 1-6 and Comparative Examples 1-7 are sprayed onto the surface of the tunnel lining using a spraying equipment with a conveying capacity of 1-25L / min. Then, they are irradiated under UV light for 5-10 minutes with a wavelength of 365nm and a light power of 500-1000w. Curing is then achieved.

[0094] The UV-curable materials prepared in Examples 1-6 and Comparative Examples 1-7 were used for tunnel reinforcement using the above-mentioned construction process. The tensile strength, Brinell hardness, and bond strength of the cured materials were tested, and the results are shown in Table 1.

[0095] Table 1

[0096]

[0097] In summary, this invention prepares a UV-curable fiber material from the aforementioned raw materials. Within a specific dosage range, the raw materials work together and influence each other to synergistically enhance the strength and toughness of the material, effectively strengthening the load-bearing capacity of the tunnel structure. Simultaneously, it significantly improves the curing speed, achieving true second-level curing, overcoming the drawback of the long curing time of traditional fiber-reinforced concrete reinforcement. Furthermore, the construction is simple and quick, effectively improving the speed of emergency rescue operations.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. An ultraviolet light-cured fibrous material, characterized by, The preparation raw material of the ultraviolet light curing fiber material includes ultraviolet light sensitive resin liquid and glass fiber; The ultraviolet light sensitive resin liquid is composed of A material and B material, the A material includes the following components in parts by weight: bisphenol A type epoxy resin 38-40 parts, trimethylolpropane triacrylate 27-30 parts, 2,4-dihydroxybenzophenone 1.6-2 parts and hydroquinone 0.85-1 part; the B material includes the following components in parts by weight: silicone rubber 1-5 parts and nano silicon dioxide 1-5 parts; The mass ratio of the A material to the B material is A material:B material=(8.5-9):(1-1.5); The mass content of the glass fiber is 10-15% based on the volume of the ultraviolet light sensitive resin liquid.

2. The ultraviolet light-cured fiber material of claim 1, wherein, The mass ratio of the A material to the B material is A material:B material=9:

1.

3. The ultraviolet light-cured fiber material of claim 1, wherein, The length of the glass fiber is 40-60 mm and the diameter is 12-15 μm.

4. The ultraviolet light-cured fiber material of claim 1, wherein, The glass fiber includes the following chemical components in percentage by weight: SiO2 61%, CaO 4.8%, Na2O 2.6%, ZrO2 14.5%, TiO2 5.88%, Al2O3 0.55%, Fe2O3 0.22%.

5. The method of producing an ultraviolet light-cured fiber material according to any one of claims 1 to 4, characterized in that, Including the following steps: (1) mixing the bisphenol A type epoxy resin and trimethylolpropane triacrylate, stirring for 5-10 min at a stirring speed of 50-70 rpm / min, standing for 5-10 min, then adding 2,4-dihydroxybenzophenone and hydroquinone, stirring for 10-15 min at a stirring speed of 50-70 rpm / min, to obtain the A material; (2) mixing the silicone rubber and nano silicon dioxide to obtain the B material; (3) adding the B material to the A material, stirring for 8-12 min, standing for 25-35 min for defoaming treatment, to obtain the ultraviolet light sensitive resin liquid; (4) adding the glass fiber to the ultraviolet light sensitive resin liquid of step (3), stirring for 8-12 min at a stirring speed of 40-50 rpm / min, standing for 25-35 min for defoaming, to obtain the ultraviolet light curing fiber material.

6. A process for the application of ultraviolet light-cured fibre materials, characterised in that Including the following steps: (1) cleaning the surface of the tunnel: cleaning the surface of the tunnel lining, removing the loose layer and impurities on the surface, exposing the clean concrete interface, polishing the surface, removing the surface dust, and then drying the surface; (2) spraying and reinforcing: spraying the ultraviolet light curing fiber material of any one of claims 1-4 to the surface of the tunnel lining through a spraying device, then irradiating under ultraviolet light, and curing.

7. The process for applying ultraviolet-cured fiber materials according to claim 6, characterized in that In step (2), the wavelength of the ultraviolet light is 365 nm and the light power is 500-1000 w.

8. The process for applying ultraviolet-cured fiber materials according to claim 6, characterized in that In step (2), the ultraviolet light irradiation time is 5-10 min.

9. The process for applying ultraviolet-cured fiber materials according to claim 6, characterized in that In step (2), the delivery capacity of the spraying device for the ultraviolet light curing fiber material is 1-25 L / min.

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