High-strength composite material as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of electric power tube bank materials, and particularly relates to a high-strength composite material and a preparation method and application thereof. The high-strength composite material is prepared from the following raw materials per cubic meter: 300 to 450 kilograms of coarse aggregate, 120 to 200 kilograms of fine aggregate, 120 to 200 kilograms of lightweight aggregate, 50 to 100 kilograms of modified reinforced epoxy resin, 30 to 50 kilograms of glass fiber, 10 to 30 kilograms of mineral powder, 4 to 6 kilograms of defoaming agent, 1 to 2 kilograms of curing agent, 3 to 6 kilograms of water reducing agent and 20 to 40 kilograms of water. The self-weight of the modularized electric tube bank prepared from the high-strength composite material can be reduced by 50-55% compared with that of common concrete, and the mechanical property and durability of the electric tube bank prepared from the composite high-strength mixed material can be improved; the apparent density of the prefabricated electric power calandria is 780-850kg / m < 3 >, and the prefabricated electric power calandria is convenient to transport and install, energy-

Description

Technical Field

[0001] The present invention belongs to the technical field of electric power pipe materials, and in particular relates to a high-strength composite material and a preparation method and application thereof. Background Art

[0002] Power pipe is a kind of pipe that meets the requirements of substation cable access and overhead line undergrounding, and provides power channels for power supply supporting plots along the line. Power pipe is also called cable pipe, power cable pipe, cement cable pipe, power pipe, power pipe, etc. It is generally built simultaneously with road construction or municipal pipeline construction.

[0003] Conventional power pipes are made of ordinary concrete, with an apparent density of 2350-2400kg / m 3 , which is heavy and inconvenient to produce, transport and install. To solve this problem, the prior art, such as a lightweight concrete and a special admixture for lightweight concrete production with the authorization announcement number CN105503018B, is a "dense-pore" lightweight building material containing a large number of closed pores inside, which is formed by uniformly adding a foaming agent to ordinary concrete and then pouring and hardening it. It has excellent performance and low production cost. The apparent density of this concrete is less than 630kg / m 3 , which will result in the prefabricated power pipes being insufficiently strong, easy to break, and not durable. Therefore, it is proposed to invent a composite high-strength mixed material for modular power pipes. The composite high-strength mixed material is 780-850kg / m 3 To reduce the weight of precast concrete power pipes, facilitate transportation and installation, and at the same time ensure the strength and durability of the power pipe components. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a high-strength composite material and its preparation method and application. The composite material of the present invention uses lightweight aggregate made by dense foaming process as raw material, which can reduce the bulk density of the mixed material while ensuring that the mixed material has a higher compressive strength; and adopts resin glass fiber vacuum process to enhance the compactness of the mixed material, ensure the quality of the composite material casting components, and at the same time ensure the appearance quality of the components.

[0005] In order to achieve the above object, the present invention provides the following technical solutions: In a first aspect, an embodiment of the present invention provides a high-strength composite material, wherein each cubic meter of the composite material comprises the following raw materials: 300-450kg coarse aggregate, 120-200kg fine aggregate, 120-200kg lightweight aggregate, 50-100kg modified reinforced epoxy resin, 30-50kg glass fiber, 10-30kg mineral powder, 4-6kg defoamer, 1-2kg curing agent, 3-6kg water reducer and 20-40kg water.

[0006] Furthermore, the mineral powder is coal slag, and the defoaming agent and curing agent are both epoxy resin.

[0007] Furthermore, the coarse aggregate is modified reinforced epoxy resin particles with a particle size of 5-15 mm and a Mohs hardness of 7-9.

[0008] Furthermore, the fine aggregate is resin particles with a particle size of 2-5 mm; The resin particles are obtained by curing PVC particles, glass fibers and modified reinforced epoxy resin at 60-70° C., wherein the mass ratio of PVC particles, glass fibers and modified reinforced epoxy resin is 45-50:15-20:30-35.

[0009] Furthermore, the lightweight aggregate includes an inner skeleton and an outer coating layer, the inner skeleton is a porous core material, the porous core material is made of one or a combination of ceramics and pumice, and the particle size is 1-2mm, and the outer coating layer is made of a glass fiber synthetic material with a thickness of 0.5-1.5mm, including glass fiber and modified reinforced epoxy resin, wherein the glass fiber is a fine fiber with a diameter of 50-100μm.

[0010] In a second aspect, an embodiment of the present invention provides a method for preparing the high-strength composite material according to the first aspect, comprising the following steps: (1) According to the mass ratio, weigh the coarse aggregate, fine aggregate, lightweight aggregate, glass fiber and mineral powder respectively, mix them, add the modified reinforced epoxy resin and 50wt% of the curing agent, and pre-stir for 30-40s; (2) Add defoamer, water reducer and water to the mixture in step (1) according to the mass ratio, and add the remaining 50wt% of curing agent, and stir for 60-70s; (3) After the mixed material obtained in step (2) is sampled and tested to be qualified, it is transported to the mold for molding.

[0011] In a third aspect, an embodiment of the present invention provides an application of a high-strength composite material. The composite high-strength material described in the first aspect is used to prepare modular power pipes. The apparent density of the prepared modular power pipes is 780-850 kg / m 3 , surface rebound strength ≥C35, impermeability grade ≥P6, electric flux ≤2000 coulomb.

[0012] The present invention has significant technical effects due to the adoption of the above technical solution: 1) The high-strength composite material of the present invention is used to prepare modular electric power pipes, which can reduce the deadweight of the electric power pipes. The weight is reduced by 50-55% compared with ordinary concrete, and the mechanical properties and durability of the composite high-strength mixed material electric power pipes are improved; the apparent density of the prepared electric power pipes is 780-850kg / m 3 , convenient for transportation and installation, energy saving and efficiency improvement.

[0013] 2) The present invention has a simplified production process, a simple construction process, and guaranteed appearance quality. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0015] Example 1 A high-strength composite material is composed of the following raw materials: 350 kg of coarse aggregate, 130 kg of fine aggregate, 140 kg of lightweight aggregate, 70 kg of modified reinforced epoxy resin, 40 kg of glass fiber, 25 kg of coal slag powder, 4 kg of epoxy resin defoamer, 2 kg of epoxy resin curing agent, 4 kg of BASF (BASF model MELMENT F10) water reducing agent and 30 kg of water.

[0016] The coarse aggregate is modified reinforced epoxy resin particles with a particle size of 5-15 mm and a Mohs hardness of 7.

[0017] The fine aggregate is resin particles with a particle size of 2-5 mm, which are obtained by curing PVC particles, glass fibers and modified reinforced epoxy resin at 60°C. The mass ratio of the PVC particles (particle size 2-5 mm), glass fibers (diameter 50-100 μm) and modified reinforced epoxy resin is 45:20:35.

[0018] The lightweight aggregate includes an inner skeleton and an outer coating layer. The inner skeleton is a porous core material, the porous core material is made of ceramic with a particle size of 1mm, and the outer coating layer is made of a glass fiber synthetic material with a thickness of 1.5mm, including glass fiber and modified reinforced epoxy resin, and the weight ratio of glass fiber to modified reinforced epoxy resin is 100:10, wherein the glass fiber is a fine fiber with a diameter of 50-100μm. The outer coating layer ensures the mechanical properties, durability and appearance of the overall cable conduit.

[0019] The method for preparing the high-strength composite material comprises the following steps: (1) According to the mass ratio, weigh the coarse aggregate, fine aggregate, lightweight aggregate, glass fiber and coal slag powder respectively, mix them, add the modified reinforced epoxy resin and 50wt% of the curing agent, and pre-stir for 30-40s; (2) Add defoamer, water reducer and water to the mixture in step (1) according to the mass ratio, and add the remaining 50wt% of curing agent, and stir for 60-70s; (3) After the exothermic mixture obtained in step (2) is sampled and tested to be qualified, it is transported to a mold for molding. The apparent density of the obtained high-strength composite material is 795 kg / m 3 .

[0020] Example 2 A high-strength composite material is composed of the following raw materials: 380 kg of coarse aggregate, 120 kg of fine aggregate, 140 kg of lightweight aggregate, 60 kg of modified reinforced epoxy resin, 42 kg of glass fiber, 25 kg of coal slag powder, 4 kg of epoxy resin defoamer, 2 kg of epoxy resin curing agent, 4 kg of BASF (BASF model MELMENT F10) water reducing agent and 25 kg of water.

[0021] The coarse aggregate is modified reinforced epoxy resin particles with a particle size of 5-15mm and a Mohs hardness of 8.

[0022] The fine aggregate is resin particles with a particle size of 2-5 mm, which are obtained by curing PVC particles, glass fibers and modified reinforced epoxy resin at 65°C, wherein the mass ratio of PVC particles (particle size 2-5 mm), glass fibers (diameter 50-100 μm) and modified reinforced epoxy resin is 45:20:35.

[0023] The lightweight aggregate includes an inner skeleton and an outer coating layer. The inner skeleton is a porous core material, the porous core material is pumice with a particle size of 2 mm, and the outer coating layer is a glass fiber synthetic material with a thickness of 1 mm, including glass fiber and modified reinforced epoxy resin, the weight ratio of glass fiber and modified reinforced epoxy resin is 100:10, wherein the diameter of the glass fiber is a fine fiber of 50-100 μm. The outer coating layer ensures the mechanical properties, durability and appearance of the overall cable conduit.

[0024] The method for preparing the high-strength composite material comprises the following steps: (1) According to the mass ratio, weigh the coarse aggregate, fine aggregate, lightweight aggregate, glass fiber and coal slag powder, mix them, add the modified reinforced epoxy resin and 50wt% of the curing agent, and pre-stir for 30-40s; (2) Add defoamer, water reducer and water to the mixture of step (1) according to the mass ratio, and add the remaining 50wt% of curing agent, and stir for 60-70s; (3) After the mixed material obtained in step (2) is sampled and tested to be qualified, it is transported to a mold for molding. The apparent density of the obtained high-strength composite material is 802 kg / m 3 .

[0025] The modified and reinforced epoxy resins in Examples 1-2 all use epoxy resins with model number HMPVC8550 from Xinglan Chemical Technology Co., Ltd. The epoxy resin defoamer in Examples 1-2 uses defoamer model ZY-105 from Shanghai Ziyi Chemical Co., Ltd. The epoxy resin curing agent in Examples 1-2 uses curing agent model TA-C03 from Tongchuang Chemical (Nanjing) Co., Ltd.

[0026] The composite material prepared in Example 1-2 was used to process a modular high-strength composite electric power pipe, and the electric power pipe was tested. The test results showed that the electric power pipe met the following conditions: the apparent density was 780-850 kg / m 3 , surface rebound strength ≥C35, impermeability grade ≥P6, electric flux ≤2000 coulomb.

[0027] It can be seen that the electric power pipes prepared in Examples 1-2 meet the enterprise standards in terms of apparent density, surface rebound strength, impermeability grade and electric flux; and the electric power pipes prefabricated with high-strength composite materials are assembled at the construction site, which reduces the complex processes brought by on-site cast-in-place concrete components, reduces costs, and is beneficial to environmental protection and energy saving; at the same time, the weight of the electric power pipes obtained in Examples 1-2 is 50-55% lower than that of ordinary concrete, which is convenient for transportation and installation, and saves energy and increases efficiency.

[0028] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A high-strength composite material, characterized in that: Each cubic meter of composite material includes the following raw materials: 300-450kg coarse aggregate, 120-200kg fine aggregate, 120-200kg lightweight aggregate, 50-100kg modified reinforced epoxy resin, 30-50kg glass fiber, 10-30kg mineral powder, 4-6kg defoamer, 1-2kg curing agent, 3-6kg water reducer and 20-40kg water.

2. The high-strength composite material according to claim 1, characterized in that: The mineral powder is coal slag, and the defoamer and curing agent are both epoxy resin.

3. The high-strength composite material according to claim 1, characterized in that: The coarse aggregate is modified reinforced epoxy resin particles with a particle size of 5-15 mm and a Mohs hardness of 7-9.

4. The high-strength composite material according to claim 1, characterized in that: The fine aggregate is resin particles with a particle size of 2-5 mm; The resin particles are obtained by curing PVC particles, glass fibers and modified reinforced epoxy resin at 60-70° C., wherein the mass ratio of PVC particles, glass fibers and modified reinforced epoxy resin is 45-50:15-20:30-35.

5. The high-strength composite material according to claim 1, characterized in that: The lightweight aggregate includes an inner skeleton and an outer coating layer. The inner skeleton is a porous core material. The porous core material is made of one or a combination of ceramics and pumice, with a particle size of 1-2 mm. The outer coating layer is made of a glass fiber synthetic material with a thickness of 0.5-1.5 mm, including glass fiber and modified reinforced epoxy resin, wherein the glass fiber is a fine fiber with a diameter of 50-100 μm.

6. The method for preparing the high-strength composite material according to any one of claims 1 to 5, characterized in that: The following steps are involved: (1) According to the mass ratio, weigh the coarse aggregate, fine aggregate, lightweight aggregate, glass fiber and mineral powder respectively, mix them, add the modified reinforced epoxy resin and 50wt% of the curing agent, and pre-stir for 30-40s; (2) Add defoamer, water reducer and water to the mixture in step (1) according to the mass ratio, and add the remaining 50wt% of curing agent, and stir for 60-70s; (3) After the mixed material obtained in step (2) is sampled and tested to be qualified, it is transported to the mold for molding.

7. An application of a high-strength composite material, characterized in that: The high-strength composite material according to any one of claims 1 to 5 is used to prepare modular electric power pipes, and the apparent density of the prepared modular electric power pipes is 780-850 kg / m 3 , surface rebound strength ≥C35, impermeability grade ≥P6, electric flux ≤2000 coulomb.