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CN-121991617-A - Structural adhesive for splicing wind power mixing tower in severe cold environment and preparation method thereof

CN121991617ACN 121991617 ACN121991617 ACN 121991617ACN-121991617-A

Abstract

The invention discloses a structural adhesive for splicing wind power mixing towers in severe cold environment and a preparation method thereof, the structural adhesive comprises a component A and a component B, wherein the component A comprises isocyanate modified epoxy resin, reactive diluent, auxiliary agent and the like, and the component B comprises modified polyamide curing agent, modified phenolic aldehyde amine curing agent, modified alicyclic amine curing agent, accelerator, auxiliary agent and the like. The structural adhesive for splicing the wind power mixing tower in the severe cold environment can react rapidly in the severe cold environment, has the characteristics of rapid solidification at low temperature, high early strength, high bonding strength and excellent durability, and is suitable for splicing construction of the wind power mixing tower in the severe cold environment.

Inventors

  • PENG JIE
  • WU JIALI
  • LI YOUJI

Assignees

  • 吉首大学

Dates

Publication Date
20260508
Application Date
20260213

Claims (9)

  1. 1. The structural adhesive for splicing the wind power mixing tower in the severe cold environment is characterized by comprising a component A and a component B; The component A comprises the following components in parts by weight: 25-55 parts of isocyanate modified epoxy resin; 1-10 parts of a reactive diluent; 15-45 parts of coarse quartz sand; 15-50 parts of fine quartz sand; 0.1-1 part of defoaming agent; 0.5-3 parts of thixotropic agent; 0.5-3 parts of a protective agent; The component B comprises the following components in parts by weight: 10-30 parts of modified polyamide curing agent; 10-30 parts of modified phenolic amine curing agent; 4-15 parts of modified alicyclic amine curing agent; 15-45 parts of coarse quartz sand; 15-50 parts of fine quartz sand; 0.5-4 parts of an accelerator; 0.5-3 parts of thixotropic agent; 1-5 parts of a coupling agent; the isocyanate modified epoxy resin contains epoxy groups and isocyanate groups, and the mass ratio of the epoxy groups to the isocyanate groups is 60-80:20-40; the reactive diluent is resorcinol diglycidyl ether; the accelerator is amino ethyl piperazine; the mass ratio of the component A to the component B is 100:20-50.
  2. 2. The structural adhesive for splicing wind power mixing towers in severe cold environment according to claim 1, wherein the preparation method of the isocyanate modified epoxy resin comprises the following steps: S1, mixing liquid epoxy resin with resorcinol diglycidyl ether, vacuum dehydrating at 120 ℃ for 1h, and cooling to room temperature for standby; S2, dropwise adding the product obtained in the step S1 into isocyanate at 80 ℃ under inert atmosphere, and continuing to react for 1h after the dropwise adding is finished; s3, adding dibutyl tin dilaurate into the product obtained in the step S2, continuing to react for 2 hours, cooling to room temperature, and then adding p-toluenesulfonyl isocyanate to obtain the isocyanate modified epoxy resin.
  3. 3. The structural adhesive for splicing wind power mixing towers in severe cold environments according to claim 2, wherein in the step S1, the liquid epoxy resin is a mixture of liquid bisphenol A epoxy resin and liquid bisphenol F epoxy resin, and the mass ratio of the liquid bisphenol A epoxy resin to the liquid bisphenol F epoxy resin is 60-80:20-40; The mass ratio of the liquid epoxy resin to the resorcinol diglycidyl ether is 70-95:5-30.
  4. 4. The structural adhesive for splicing wind power mixing towers in severe cold environments according to claim 2, wherein in the step S2, the isocyanate is one or a mixture of several of isophorone diisocyanate, diphenylmethane diisocyanate, toluene diisocyanate and oligomer of diphenylmethane diisocyanate.
  5. 5. The structural adhesive for splicing wind power mixing towers in severe cold environments according to claim 2, wherein in the step S3, the addition amount of the dibutyl tin dilaurate is 0.1-0.3% of the mass of the liquid epoxy resin, and the addition amount of the p-toluenesulfonyl isocyanate is 0.5-1.0% of the mass of the liquid epoxy resin.
  6. 6. The structural adhesive for splicing wind power mixing towers in severe cold environment according to claim 1, wherein in the component A and the component B, coarse quartz sand is 100-200 meshes of quartz sand, and fine quartz sand is 300-600 meshes of quartz sand; The thixotropic agent in the component A is hydrophobic fumed silica A380, and the thixotropic agent in the component B is hydrophilic fumed silica A200.
  7. 7. The structural adhesive for splicing wind power mixing towers in severe cold environments according to claim 1, wherein the modified polyamide curing agent is one or a mixture of modified polyamide curing agents BS8733 and Feng Yi of oil technology, inc. of Jiangxi Baisheng fine chemicals, inc. polyamide resin YD-8140A; The modified phenolic amine curing agent is modified phenolic amine curing agent MD641 of Anhui Meidong biological material limited company; the modified alicyclic amine curing agent is R-2254 in the Guangzhou Ruiqi chemical industry.
  8. 8. The structural adhesive for splicing wind power mixing towers in severe cold environments according to claim 1, wherein the defoamer is AFCONA-2620 organosilicon polymer defoamer; the protective agent is p-toluenesulfonyl isocyanate; The coupling agent is 3-aminopropyl trimethoxy silane KH540.
  9. 9. The method for preparing the structural adhesive for splicing wind power mixing towers in severe cold environments according to any one of claims 1 to 8, which is characterized by comprising the following steps: S1, dispersing isocyanate modified epoxy resin, an active diluent and a defoaming agent at a high speed for 1-2 minutes, adding a thixotropic agent, dispersing at a high speed for 3-5 minutes, finally adding dried coarse quartz sand and dried fine quartz sand, stirring for 5-10 minutes under the vacuum degree of less than or equal to-0.085 MPa, and finally adding a protective agent and stirring for 3-5 minutes to obtain a component A; S2, dispersing the modified polyamide curing agent, the modified phenolic aldehyde amine curing agent, the modified alicyclic amine curing agent, the accelerator and the coupling agent at a high speed for 1-2 minutes, adding the thixotropic agent, dispersing at a high speed for 3-5 minutes, and finally adding the dried coarse quartz sand and the dried fine quartz sand, and stirring for 5-10 minutes under the vacuum degree of less than or equal to-0.085 MPa to obtain a component B; S3, independently sealing and packaging the component A and the component B, and uniformly mixing according to a proportion when in use.

Description

Structural adhesive for splicing wind power mixing tower in severe cold environment and preparation method thereof Technical Field The invention belongs to the technical field of adhesive materials and application thereof, and particularly relates to a structural adhesive for splicing a wind power mixing tower in a severe cold environment and a preparation method thereof. Background Under the background of the vast development of clean energy in China, wind power generation is rapidly developed due to low cost and mature technology. By 2030, new installed capacity is expected to reach about 170GW for the wind power year. In order to improve the single-machine power generation efficiency and the wind field resource utilization rate and meet the trend of large-scale and high cavitation of the wind turbine generator, the wind power mixing tower with the lower concrete section and the upper steel tower section is widely applied. The concrete sections of the wind power mixing tower are connected by adopting a segmented prefabrication and field splicing process, and each concrete section is connected by adopting an epoxy structural adhesive and a prestressed rib, and the connecting structure is a key for ensuring the safety and service life of the whole structure. However, the curing reaction of epoxy structural adhesives is a temperature dependent chemical crosslinking process, the reaction rate of which is extremely sensitive to ambient temperature. Under the normal temperature condition, the epoxy structural adhesive can be cured according to the design time, and the construction progress and strength development requirements are met. But when applied to high-latitude or high-altitude areas such as north China and northwest China, the construction site is in a severe cold environment ranging from-15 ℃ to 0 ℃ for a long time. In such a severe cold environment, the curing reaction of the curing agent and the epoxy group becomes extremely slow, which will seriously affect the construction efficiency and the construction period arrangement of the wind power mixing tower project, even cause the winter construction to be almost stopped. The epoxy structural adhesive is difficult to cure completely at low temperature, and cannot form enough strength in a key curing period, so that the long-term bearing performance, fatigue resistance and durability of the wind power mixing tower are affected, and serious potential safety hazards are buried. Aiming at the difficult problem of slow low-temperature curing of the epoxy structural adhesive, the prior art is mainly improved by adopting external heating measures, such as 'a modified epoxy adhesive and application thereof in splicing wind power mixing towers under severe cold environment' CN202311723879.8, 'a method for splicing wind power mixing towers under severe cold environment' CN202311724298.6 and the like, and adopts pre-buried heating plates during coating construction of the epoxy structural adhesive, and then electrifying, heating and heating up to realize quick curing of the epoxy structural adhesive. However, the method has relatively complex site construction procedures, high requirements on low-temperature construction of workers and high requirements on safety management, and the cost is increased due to the need of additionally purchasing materials of a heating device and additionally consuming electric energy. Secondly, the low-temperature epoxy resin, the low-temperature curing agent, the accelerator and other schemes are added in the formula of the epoxy structural adhesive, and the schemes can improve the low-temperature curing speed to a certain extent, but the curing efficiency of the epoxy structural adhesive in a severe cold environment with the temperature less than or equal to 0 ℃ is still slow, and the full life cycle performance requirements of the wind power mixing tower under complex and severe weather conditions for twenty years are difficult to meet at the expense of other key performances (such as strength, toughness and durability) of the adhesive. Therefore, development of a structural adhesive which can be rapidly solidified in a severe cold environment and has high strength, high bonding strength and excellent durability is urgently needed, so that the quality and efficiency of low-temperature construction of the wind power mixing tower are guaranteed, and the limitation of severe cold weather on the project period of the wind power mixing tower is broken through. Disclosure of Invention In view of the defects existing at present, the structural adhesive for splicing the wind power mixing tower in the severe cold environment and the preparation method thereof provided by the invention can rapidly react in the severe cold environment, have the characteristics of rapid low-temperature solidification, high early strength, high bonding strength and excellent durability, and are suitable for splicing construction of the wind power mixing towe