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CN-122011914-A - Special anti-explosion corrosion-resistant pressure vessel protective material and preparation method thereof

CN122011914ACN 122011914 ACN122011914 ACN 122011914ACN-122011914-A

Abstract

The invention belongs to the technical field of protective coating, and particularly relates to a special explosion-proof corrosion-resistant pressure vessel protective material and a preparation method thereof, aiming at the problem that the existing protective material has mutual restriction between pursuing high strength, high flame retardance and high corrosion resistance, the invention realizes the cooperative promotion of the three materials through an innovative functional composite design and preparation process, firstly, a halloysite nanotube is functionally modified by tannic acid and borax to prepare a TA-B@HNTs functional composite, then the composite is mixed with polyether diamine and diethyl toluene diamine, mixed resin is prepared through vacuum defogging, and finally, an isocyanate prepolymer and the mixed resin are respectively heated to a specific temperature and are mixed through high-pressure impact, so that the protective material is formed through rapid reaction.

Inventors

  • Xiong Zhangli
  • LAN TIANXIANG

Assignees

  • 湖北凯发实业有限公司

Dates

Publication Date
20260512
Application Date
20260413

Claims (10)

  1. 1. The utility model provides a special explosion-proof corrosion-resistant pressure vessel protective material, protective material is spraying polyurea reactant, its characterized in that: The protective material is prepared by mixing mixed resin and isocyanate prepolymer through high-pressure impact, wherein the mixed resin consists of functional composite filler and a resin matrix, the functional composite filler consists of halloysite nanotubes, tannic acid and borax, and the resin matrix is polyetheramine and diethyltoluenediamine.
  2. 2. The special explosion-proof corrosion-resistant pressure vessel protective material according to claim 1, wherein: The mixed resin comprises the following raw materials, by taking 100 parts of polyether amine as a reference, 15-40 parts of diethyl toluenediamine and 3-10 parts of functional composite filler.
  3. 3. The special explosion-proof corrosion-resistant pressure vessel protective material according to claim 1, wherein: the isocyanate prepolymer comprises 12-18% of-NCO by mass.
  4. 4. The special explosion-proof corrosion-resistant pressure vessel protective material according to claim 1, wherein: The functional composite filler comprises tannic acid and halloysite nanotubes in a mass ratio of 0.2:1-0.5:1, and borax and halloysite nanotubes in a mass ratio of 0.05:1-0.15:1.
  5. 5. The method for preparing the special explosion-proof corrosion-resistant pressure vessel protective material according to any one of claims 1 to 4, which is characterized by comprising the following steps: S1, preparing a functional complex; S11, adding halloysite nanotube powder into deionized water, and performing ultrasonic treatment to obtain HNTs suspension; s12, sequentially adding tannic acid and borax into the HNTs suspension prepared in the step S11, stirring, adjusting the pH to 8.5-10, heating, stirring, centrifugally separating, washing, vacuum drying, grinding and sieving to obtain a TA-B@HNTs functional complex; S2, preparing mixed resin, namely preheating polyether amine to 50-60 ℃, adding diethyl toluenediamine, stirring, then adding the TA-B@HNTs functional complex prepared in the S12, stirring at a medium speed, shearing and dispersing at a high speed, vacuum defoaming, filtering, and filling nitrogen for preservation to obtain the mixed resin; And S3, preparing a protective material, namely heating the isocyanate prepolymer to 58-62 ℃, heating the mixed resin prepared in the step S2 to 68-72 ℃, and then carrying out high-pressure impact mixing on the isocyanate prepolymer and the mixed resin to obtain the protective coating.
  6. 6. The method for preparing the special explosion-proof corrosion-resistant pressure vessel protective material according to claim 5, which is characterized in that: S11, halloysite nanotube powder, wherein the mass-volume ratio of the halloysite nanotube powder to deionized water is 1:20 g:mL; and S11, setting parameters of ultrasonic treatment, namely, setting power to be 400-600W, frequency to be 20-25 kHz and duration to be 30-45 min.
  7. 7. The method for preparing the special explosion-proof corrosion-resistant pressure vessel protective material according to claim 5, which is characterized in that: S12, setting parameters of stirring, namely, rotating at 300-500 rpm for 15-25 min; Heating and stirring as described in S12, wherein parameters are set as follows: the temperature is 70-90 ℃, the rotating speed is 400-600 rpm, and the time is 3-6 hours; and S12, setting parameters of the vacuum drying, namely, setting the temperature to be 60-80 ℃, the vacuum degree to be-0.08 to-0.09 MPa, and the duration to be 12-24 hours.
  8. 8. The method for preparing the special explosion-proof corrosion-resistant pressure vessel protective material according to claim 5, which is characterized in that: S2, setting parameters of stirring, namely, rotating at 400-500 rpm for 15-30 min; and S2, setting parameters of the medium-speed stirring, namely, rotating speed of 500-800 rpm and duration of 10-15 min.
  9. 9. The method for preparing the special explosion-proof corrosion-resistant pressure vessel protective material according to claim 5, which is characterized in that: S2, setting parameters of the high-speed shearing dispersion, wherein the rotating speed is 1000-1500 rpm, and the time length is 40-60 min; and S2, setting parameters of the vacuum defoaming, namely, the temperature is 35 ℃, the vacuum degree is-0.08 MPa, the rotating speed is 300rpm, and the duration is 30min.
  10. 10. The method for preparing the special explosion-proof corrosion-resistant pressure vessel protective material according to claim 5, which is characterized in that: s3, the volume flow ratio of the isocyanate prepolymer to the mixed resin is 1:1; And S3, setting parameters of the high-pressure impact mixing, namely, 20-30 MPa of system pressure, 15-20 MPa of dynamic pressure and 12-18 MPa of static pressure.

Description

Special anti-explosion corrosion-resistant pressure vessel protective material and preparation method thereof Technical Field The invention belongs to the technical field of protective coating, and particularly relates to a special anti-explosion corrosion-resistant pressure vessel protective material and a preparation method thereof. Background Pressure vessels in chemical plants are often subjected to high temperature and high pressure conditions, requiring both high mechanical strength and good adhesion of the coating to ensure safe operation and good corrosion resistance to resist acid-base medium attack. However, the high performance coating materials currently in common use often suffer from the disadvantage of being flammable while satisfying strength and chemical resistance. Epoxy resins are widely used in anticorrosive coatings (CN 121338124 a) because of their excellent mechanical strength, chemical resistance and adhesion, but are inherently flammable organic polymers which are easy to burn and rapidly release heat when exposed to fire, lacking in intrinsic flame retardancy. The flame retardant is usually required to be added to improve the flame retardant performance of the organic coating, but the traditional flame retardant scheme often leads to the trade-off in performance, for example, the addition of high-filling inorganic flame retardant filler can be flame retardant to a certain extent but can obviously reduce the mechanical strength and adhesive force of the coating, and the halogen-containing flame retardant is good in effect but is easy to generate toxic corrosive gas and does not meet the environmental protection requirement. The phosphorus and nitrogen flame retardants are relatively environment-friendly, but the mechanical property or the water resistance stability of a cured product is affected by the addition of the phosphorus and nitrogen flame retardants, so that the strength and the flame retardance are difficult to be simultaneously achieved. In recent years, the introduction of nano-functional fillers provides a new approach for the balance of properties of coating materials. If the functionalized Halloysite Nanotubes (HNTs) are introduced into an epoxy resin matrix, the matrix can be promoted to form carbon during combustion and the flame retardant efficiency is improved, but the common HNTs lack active flame retardant and corrosion inhibition functions, more physical barriers are used, and remarkable flame retardant and corrosion prevention effects are difficult to obtain when the modification is insufficient. Besides flame-retardant challenges, the conventional anti-corrosion coating has limitations in heavy corrosion prevention, and the traditional high-efficiency anti-corrosion pigment and filler often adopts inorganic corrosion inhibitors such as lead, chromate and the like, and although the inorganic corrosion inhibitors can provide certain cathodic protection or passivation effect, the substances are toxic and not environment-friendly, the use is strictly limited, tannic Acid (TA) of the implanted groups can be complexed with metal ions to form a stable protective film due to rich phenolic hydroxyl groups in molecules, and the Tannic Acid (TA) is considered as a green corrosion inhibitor with good prospect, however, tannic acid small molecules can be directly mixed into resin to be unevenly dispersed or have poor compatibility with the resin, and can be easily dissolved and lost by water in the coating. Therefore, tannic acid needs to be carried out proper carrier loading or chemical bonding so as to stably exist in the coating and exert long-acting corrosion inhibition effect. In summary, the prior art still has significant shortcomings in the aspect of simultaneously realizing high strength, flame retardance and corrosion resistance of the coating, and a functional composite material is needed to be provided, which has high-efficiency flame retardance and corrosion resistance functions by synergistically fixing tannic acid and boron-containing components on nano halloysite, and meanwhile, the mechanical strength is improved by utilizing nano fillers, so that the bottleneck of the balance of the performance of the existing material is broken through. Disclosure of Invention The invention provides a special anti-explosion corrosion-resistant pressure vessel protective material and a preparation method thereof, and aims to solve the problems that traditional base materials such as epoxy and the like are inflammable, mechanical properties are reduced after a flame retardant is added, and corrosion resistance depends on a toxic corrosion inhibitor. The specific technical scheme is as follows: a special anti-explosion corrosion-resistant pressure vessel protective material and a preparation method thereof are as follows: S1, preparing a functional complex. And S11, adding halloysite nanotube powder into deionized water, and performing ultrasonic treatment to obtain HNTs s