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CN-122010460-A - Super-hydrophobic material based on retired wind power blade powder, preparation method thereof and hydrophobic concrete containing super-hydrophobic material

CN122010460ACN 122010460 ACN122010460 ACN 122010460ACN-122010460-A

Abstract

The invention discloses a super-hydrophobic material based on retired wind power blade powder, a preparation method thereof and hydrophobic concrete containing the super-hydrophobic material. The super-hydrophobic material is prepared by adding retired wind power blade powder into absolute ethyl alcohol for ultrasonic dispersion, sequentially adding water, a coupling agent, an alkanol mixture, a catalyst, a siloxane modifier and nano titanium dioxide for composite reaction, wherein the alkanol mixture is prepared by mixing n-hexane and isopropanol according to a volume ratio of 1:1, the retired wind power blade powder is prepared by preprocessing a front section of retired wind power blade, crushing, grinding, removing resin, grinding and grading, and the super-hydrophobic material is mixed with cement, natural coarse aggregate, natural sand, a water reducing agent and water to obtain the hydrophobic concrete. According to the invention, the super-hydrophobic material is obtained by modifying the retired wind power blade powder, and then the super-hydrophobic material is added into the concrete mixture, so that the impermeability of the concrete can be effectively improved, and the durability of the concrete structure is greatly improved.

Inventors

  • DUAN ZHENHUA
  • WANG HAILIANG
  • ZHANG WEI

Assignees

  • 同济大学

Dates

Publication Date
20260512
Application Date
20260415

Claims (10)

  1. 1. The super-hydrophobic material based on retired wind power blade powder is characterized by comprising the following raw material components in parts by weight: 60-150 parts of retired wind power blade powder, 2-15 Parts of a coupling agent, 1-50 Parts of a siloxane modifier, 3-20 Parts of nano titanium dioxide, 50-150 Parts of an alkanol mixture, 0.5-5 Parts of a catalyst, 100-800 Parts of absolute ethyl alcohol, 2-15 Parts of water; the alkanol mixture is obtained by mixing n-hexane and isopropanol according to a volume ratio of 1:1; the catalyst is a noble metal catalyst; the decommissioning wind power blade powder is obtained by pre-treating, crushing, grinding, removing resin, grinding and grading the decommissioning wind power blade, wherein the method for removing the resin comprises heat treatment, flocculation or electrostatic separation; The super-hydrophobic material is prepared by adding retired wind power blade powder into absolute ethyl alcohol for ultrasonic dispersion, and then sequentially adding water, a coupling agent, an alkanol mixture, a catalyst, a siloxane modifier and nano titanium dioxide for composite reaction.
  2. 2. The super-hydrophobic material based on the retired wind power blade powder according to claim 1, wherein when the heat treatment method is adopted to remove resin in the retired wind power blade powder, the heat treated powder is cooled to room temperature and then ground and refined to the granularity of 200-10000 meshes; the heat treatment method comprises the steps of placing a retired wind power blade product subjected to pretreatment, crushing and grinding in a furnace containing inert gas at 400-700 ℃ for heat treatment for 0.5-2 hours to remove resin.
  3. 3. The super-hydrophobic material based on retired wind power blade powder according to claim 2, wherein the grinding is carried out by adopting a high-speed mechanical crushing, ball milling or air flow grinding method, the rotating speed in the ball mill is 800-1200 r/min when the ball milling method is adopted, the grinding time is 1-4 hours, and the grinding refinement granularity is 300-1200 meshes.
  4. 4. The super-hydrophobic material based on the retired wind power blade powder according to claim 1, which is characterized by comprising the following raw materials in parts by weight: 70-130 parts of retired wind power blade powder, 4-10 Parts of a coupling agent, 5-25 Parts of a siloxane modifier, 5-15 Parts of nano titanium dioxide, 80-100 Parts of an alkanol mixture, 1-3 Parts of a catalyst, 300-500 Parts of absolute ethyl alcohol, 4-10 Parts of water.
  5. 5. The super-hydrophobic material based on retired wind power blade powder according to any one of claims 1-4, wherein the coupling agent is selected from any one or more of silanes, titanates, zirconates and aluminum-titanium composite coupling agents; the siloxane modifier is selected from one or more than one of polymethyl hydrosiloxane, polydimethyl siloxane, polydiethyl siloxane, methyltrimethoxysilane and hexadecyltrimethoxysilane; The catalyst is a platinum catalyst; the nano titanium dioxide is commercially available nano titanium dioxide, and the particle size is 20-40 nm.
  6. 6. A preparation method of a super-hydrophobic material based on retired wind power blade powder according to any one of claims 1 to 5 is characterized by comprising the steps of firstly adding the retired wind power blade powder material into absolute ethyl alcohol for ultrasonic dispersion, secondly adding water and a coupling agent for surface pretreatment, secondly adding an alkanol mixture, sequentially dripping a catalyst and a siloxane modifier, finally adding nano titanium dioxide suspension for grafting and compounding reaction, and obtaining the super-hydrophobic material with super-hydrophobic and photocatalytic functions through cleaning, drying and grinding to a certain fineness; the fineness of the super-hydrophobic material is 300-1200 meshes.
  7. 7. The preparation method according to claim 6, comprising the following steps: (1) Adding the retired wind power blade powder into absolute ethyl alcohol according to the ratio of the mass/g of the retired wind power blade powder to the volume/mL of the absolute ethyl alcohol of 1:3, carrying out ultrasonic condition treatment to fully disperse the retired wind power blade powder to obtain a solution A; the ultrasonic frequencies are 20-60 kHz, and the ultrasonic treatment time is 5-20 min; (2) Sequentially dripping water and a silane coupling agent into the solution A prepared in the step (1) at a constant speed of 1-3 drops/second under a stirring state, and continuously stirring at normal temperature for reacting for 5-20 min after dripping, then adding an alkanol mixture into the solution A, sequentially dripping a catalyst and a siloxane modifier at a constant speed of 1-3 drops/second under a stirring state, and stirring at 40-80 ℃ for reacting for 5-20 min after dripping to obtain a mixed solution C; (3) Slowly adding the solution B obtained in the step (1) into the mixed solution C obtained in the step (2), and stirring and reacting for 10-30 min at 40-80 ℃ to obtain slurry; (4) And (3) drying the slurry obtained in the step (3) to constant weight, and then grinding to 300-1200 meshes to obtain the super-hydrophobic material which takes the active glass fiber as a framework, has the surface uniformly compounded with nano titanium dioxide and is modified by a long-chain siloxane layer.
  8. 8. A hydrophobic concrete comprising the superhydrophobic material of any one of claims 1-5, characterized by comprising the following raw material components in parts by weight: 200-400 parts of cement, 860-1140 Parts of natural coarse aggregate, 600-740 Parts of natural sand, 5-40 Parts of super-hydrophobic material, 0.5-2 Parts of water reducer, 120-200 Parts of water.
  9. 9. The hydrophobic concrete according to claim 8, wherein the hydrophobic concrete comprises the following raw materials in parts by weight: 250-350 parts of cement and the balance of the cement, 960-1080 Parts of natural coarse aggregate, 630-690 Parts of natural sand, 6-24 Parts of super-hydrophobic material, 0.7-1.3 Parts of water reducer, 130-170 Parts of water; The cement is P.O 42.5.5 ordinary silicate cement, the average grain diameter is 10-34 mu m, and the compressive strength in 28 days is 44.6-51.2 MPa; The coarse aggregate is natural crushed stone aggregate with the thickness of 5-20 mm, the apparent density of 2600-2800 kg/m 3 and the bulk density of 1410-1630 kg/m 3 ; The fineness modulus of the natural sand is 2.4-3.0, and the average grain diameter is 0.30-0.60 mm; the water reducer is a polycarboxylic acid high-performance water reducer, and the water reducing rate is 22% -28%.
  10. 10. A method of preparing a hydrophobic concrete according to claim 8 or 9, comprising the steps of: (1) Sampling natural coarse aggregate and natural sand according to the component content in the proportion, and sequentially pouring the natural coarse aggregate and the natural sand into a concrete mixer to be dry-mixed for 0.5-2 minutes; (2) Sampling the cement and the superhydrophobic material according to the component content in the proportion, mechanically stirring for 0.5-2 minutes until the components are uniformly mixed to form a premix, and then adding the premix into a concrete mixer to be dry-stirred for 0.5-3 minutes; (3) Sampling water and a water reducing agent according to the component content in the proportion, pre-stirring for 0.5-2 minutes in a container to form uniform and stable diluent, then slowly adding the diluent into a concrete mixer, and stirring for 1-3 minutes to obtain a hydrophobic fresh concrete mixture; (4) Pouring the hydrophobic fresh concrete mixture obtained in the step (3) into a concrete test piece, vibrating and compacting the concrete test piece on a vibrating table, standing for 24 hours at normal temperature, removing a mold, and curing the concrete test piece for 28 days under standard curing conditions with the temperature of 20 ℃ plus or minus 2 ℃ and the relative humidity of more than 95%, thereby obtaining the hydrophobic concrete.

Description

Super-hydrophobic material based on retired wind power blade powder, preparation method thereof and hydrophobic concrete containing super-hydrophobic material Technical Field The invention belongs to the technical field of solid waste recycling and functional materials, and particularly relates to a super-hydrophobic material based on retired wind power blade powder, a preparation method thereof and hydrophobic concrete containing the super-hydrophobic material. Background With the vigorous development of the wind power industry, the first large-scale installed wind turbine generators are successively entering the retirement period. Wind blades have become a global environmental and resource challenge to handle as a core composite component. The blade is mainly composed of glass fiber, resin and other thermosetting composite materials, and has stable chemical property and difficult natural degradation. The traditional landfill treatment method not only occupies a large amount of land resources, but also has potential environmental pollution risks. Therefore, development of the high-value and resource recycling technology of the retired wind power blade has great significance for promoting sustainable development of the wind power industry. In the field of building materials, the durability of concrete directly determines the service life and safety of a building structure. Concrete is a hydrophilic porous material, and water and aggressive ions (such as Cl、SO42) The corrosion, freeze thawing damage and sulfate corrosion of the steel bar are directly induced by the penetration of the capillary channel. Meanwhile, pollutants are easy to adhere to the surface of the concrete, microorganisms are bred, and the freezing risk is obviously increased due to water retention in a cold environment, so that the deterioration of the concrete is aggravated and the use safety of the concrete is threatened due to the derivatization problems caused by water and pores. Therefore, it is urgent to improve the durability of the concrete. Superhydrophobic materials exhibit great potential in improving durability of concrete due to their extreme water repellency characteristics. By constructing the super-hydrophobic layer on the surface or inside of the concrete, the invasion of liquid water can be effectively blocked, so that the occurrence of various durable diseases is fundamentally delayed. However, the current method for preparing the super-hydrophobic concrete is mostly dependent on complex chemical vapor deposition, etching and other processes, so that the cost is high, the process is complex, and the method is difficult to apply to large-scale civil engineering. Disclosure of Invention Aiming at the problems in the background art, the invention provides a super-hydrophobic material based on retired wind power blade powder, a preparation method thereof and hydrophobic concrete containing the super-hydrophobic material. In order to achieve the aim of the invention, the invention adopts the following technical scheme: a super-hydrophobic material based on retired wind power blade powder comprises the following raw material components in parts by weight: 60-150 parts of retired wind power blade powder, 2-15 Parts of a coupling agent, 1-50 Parts of a siloxane modifier, 3-20 Parts of nano titanium dioxide, 50-150 Parts of an alkanol mixture, 0.5-5 Parts of a catalyst, 100-800 Parts of absolute ethyl alcohol, 2-15 Parts of water; the alkanol mixture is obtained by mixing n-hexane and isopropanol according to a volume ratio of 1:1; The decommissioning wind power blade powder is obtained by pre-treating a decommissioning wind power blade at a front end, crushing, grinding, removing resin, grinding and grading, wherein the decommissioning wind power blade mainly comprises glass fibers and resin, the decommissioning wind power blade is prepared by pre-treating the front end to remove secondary components such as sandwich structure materials, crushing, grinding and the like, the decommissioning wind power blade powder is finally prepared by removing the resin by adopting the existing methods such as heat treatment, flocculation or electrostatic separation and the like, preferably removing the resin by adopting the heat treatment, cooling the heat-treated powder to room temperature, grinding and refining to the granularity of 200-10000 meshes, preferably 300-1200 meshes, grinding by adopting the existing grinding methods such as high-speed mechanical crushing, ball grinding or air flow grinding, preferably adopting the ball grinding method, wherein the rotating speed in the ball grinding mill is 800-1200 r/min, and the grinding time is 1-4 hours; The heat treatment method comprises the steps of placing the retired wind power blade product subjected to pretreatment, crushing and grinding in a furnace containing inert gas at 400-700 ℃ for heat treatment for 0.5-2 hours to remove resin, wherein the heat treatment temperature and time are