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CN-121082531-B - Stainless steel paint and preparation method thereof

CN121082531BCN 121082531 BCN121082531 BCN 121082531BCN-121082531-B

Abstract

The application provides a stainless steel paint and a preparation method thereof, wherein modified filler A is introduced into a primer, modified filler B is introduced into a finish paint, and activation treatment is carried out on the surface of a stainless steel substrate, the modified filler A adopts fumed silica subjected to epoxy resin surface modification treatment, the modified filler B adopts chitin nanofiber subjected to uniform modification treatment, so that the interface performance of the surface of the stainless steel substrate is effectively improved, the primer can be quickly wetted on the surface of the substrate, quickly permeated into micropores on the surface of the substrate, chemically bonded and mechanically engaged with the substrate, the finish paint is sprayed on the primer after the primer is solidified, the modified filler B enriches the types of the chemical bonds in a finish paint system, a three-dimensional net-shaped crosslinked structure is formed on the interface between the finish paint and the primer, the compactness degree of the interface between the finish paint and the primer is obviously improved, corrosion factors are intercepted from permeating the primer, the corrosion resistance of the paint is obviously improved, and the paint has the advantages of excellent corrosion resistance, suitability for strong corrosion operation scenes, and convenience in popularization and implementation.

Inventors

  • ZHU CHUNGUI
  • WU ZHIJIA

Assignees

  • 广东豪之盛新材料有限公司

Dates

Publication Date
20260508
Application Date
20250829

Claims (6)

  1. 1. The stainless steel paint is characterized by comprising a primer and a finish which are sequentially coated on a stainless steel substrate; wherein, the stainless steel substrate is subjected to surface activation treatment of an activating solution; the primer consists of 41-55 parts of polyurethane modified epoxy resin, 5-10 parts of silane coupling agent, 11-18 parts of modified filler A, 4-8 parts of nano zinc powder, 2-5 parts of functional auxiliary agent and 15-25 parts of solvent according to weight fraction; Wherein, the finishing paint comprises the following components, by weight, 35-48 parts of bisphenol A epoxy resin, 5-8 parts of polydimethylsiloxane, 13-15 parts of modified filler B, 2-5 parts of functional auxiliary agent and 15-25 parts of solvent; The modified filler A is fumed silica subjected to surface modification treatment of epoxy resin; The modified filler B is chitin nanofiber subjected to homogenization modification treatment; The activating solution comprises, by weight, 2-5 parts of pH regulator, 2-5 parts of zinc chloride, 2-5 parts of ammonium chloride and 15-30 parts of deionized water; Wherein the pH value of the activating solution is 3-4, and the pH regulator is one or more of hydrochloric acid, hydrofluoric acid, phosphoric acid, malic acid, tartaric acid and lactic acid; The preparation method of the modified filler A comprises the following steps: Step 101, sequentially adding fumed silica, ethyl acetate, acetone and 2, 4-diisocyanate into a stirring kettle, and stirring at room temperature and 1200rpm for 20min to obtain a pre-reaction system; Step 102, transferring the pre-reaction system prepared in the step 101 into an ultrasonic reaction kettle, reacting for 5-7 hours under the conditions of water bath 90 ℃ and ultrasonic frequency of 20kHz-25kHz, filtering liquid phase, washing with ethyl acetate and drying in sequence to obtain a modified fumed silica intermediate; Step 103, sequentially adding the modified fumed silica intermediate prepared in the step 102, bisphenol A epoxy resin, triethylene diamine and acetone into an ultrasonic reaction kettle, reacting for 1-2 hours at the temperature of 120 ℃ and the ultrasonic frequency of 25kHz-30kHz to obtain a modified fumed silica crude product, and sequentially filtering, extracting and removing impurities from the modified fumed silica crude product to obtain a modified filler A; Sequentially adding pretreated chitin and glacial acetic acid solution into an ultrasonic cell crusher, crushing for 0.5-1.5 h at room temperature under the conditions of ultrasonic power of 500W and ultrasonic crushing frequency of 23kHz, and sequentially filtering and drying to obtain modified filler B; The pretreatment of the chitin comprises the following steps: step 201, sequentially adding chitin and succinic anhydride into a dispersion kettle according to a mass ratio of 1:7, reacting for 3-5 hours at 120 ℃ and 2200rpm under a sealing condition, transferring a reaction system and excessive absolute ethyl alcohol into a centrifugal machine, centrifuging, removing supernatant after supernatant liquid is in a colorless transparent state, and sequentially washing and drying lower solid matters to obtain primary modified chitin; Step 202, sequentially adding the primary modified chitin and NaOH solution prepared in the step 201 into a reaction kettle according to the mass ratio of (12-22), reacting for 1-10 h at the temperature of 90 ℃ in water bath and at the speed of 100-300 rpm, then dropwise adding glacial acetic acid into the reaction system, transferring the reaction system into a centrifuge for centrifugation after the pH value of the reaction system is stabilized to 3, removing supernatant after the supernatant is centrifuged to an upper liquid in a colorless transparent state, and sequentially washing and drying lower solid substances to obtain pretreated chitin.
  2. 2. A stainless steel spray paint according to claim 1, wherein the NaOH solution in step 202 is at a concentration of 12.5wt% to 32.5wt%.
  3. 3. A stainless steel spray paint according to claim 1, wherein the stainless steel substrate surface activation treatment comprises the steps of: Step 301, polishing the surface of a stainless steel substrate, sequentially putting the stainless steel substrate and cleaning liquid into an ultrasonic treatment tank after polishing, cleaning for 5-10 min at room temperature under the condition that the ultrasonic frequency is 25kHz, taking the stainless steel substrate out of the ultrasonic treatment tank, and drying to finish cleaning the stainless steel substrate; Step 302, sequentially putting the stainless steel substrate and the activating solution which are washed in the step 301 into an ultrasonic treatment tank, activating for 2-4 min at room temperature under the condition that the ultrasonic frequency is 20kHz, taking the stainless steel substrate out of the ultrasonic treatment tank, and sequentially washing with deionized water, washing with anhydrous ethanol and drying to complete the activation of the stainless steel substrate.
  4. 4. A stainless steel paint according to claim 3, wherein in step 301, said cleaning solution is selected from any one of acetone, absolute ethyl alcohol, and saturated sodium bicarbonate solution.
  5. 5. A method for producing a stainless steel lacquer according to any one of claims 1 to 4, characterized in that it comprises the following steps: Step 401, sequentially adding polyurethane modified epoxy resin, a silane coupling agent, modified filler A, nano zinc powder, a functional auxiliary agent and a solvent into a dispersing kettle according to a preset target proportion, and dispersing for 15min at 35 ℃ and 2000rpm to obtain a primer; And 402, sequentially adding bisphenol A epoxy resin, polydimethylsiloxane, modified filler B, functional auxiliary agents and solvent into a dispersing kettle according to a preset target proportion, and dispersing for 18min at 35 ℃ and 2200rpm to obtain the finish paint.
  6. 6. The method for preparing a stainless steel paint according to claim 5, wherein a curing agent and a catalyst are added to the primer or the top-coat respectively before spraying, the curing agent is tetraisopropyl silicate, and the catalyst is dibutyl tin dilaurate.

Description

Stainless steel paint and preparation method thereof Technical Field The application belongs to the technical field of paint production, and particularly relates to a stainless steel paint and a preparation method thereof. Background In the prior art, stainless steel is widely used in various fields such as pipes, utilities, highways, etc. due to its excellent properties. It has the advantages of better strength, higher wear resistance, etc. The metal corrosion is damage or deterioration caused by environmental effects, and the corrosion resistance of the traditional stainless steel is difficult to meet the requirements under the strong corrosion (strong acid, seawater and the like) environment. In the fields of power systems, industrial systems and the like, the phenomena of energy loss, equipment damage, gas-liquid leakage and the like are often caused by corrosion of metal materials, so that huge economic loss is brought, environmental pollution is easily caused, and the health of people is endangered, and therefore, the corrosion resistance of stainless steel is enhanced through a coating to reduce the economic loss becomes a necessary measure. In the prior art, the stainless steel anticorrosive paint is of various types and mainly comprises coating of zinc, chromium, clay, modified resin and other materials, but the applied materials often have some defects, wherein the problem of lower adhesive force of a paint film is particularly remarkable. Along with the increase of service life, the paint film is peeled off from the surface of the base material, so that external corrosion factors are in contact with the surface of the base material rapidly, the surface of the base material is corroded in an accelerated manner, and the service life of the stainless steel base material is obviously reduced. Therefore, improvements are needed to improve the comprehensive performance of the stainless steel paint, further prolong the service life of the stainless steel base material and reduce the economic loss. Disclosure of Invention The application provides a stainless steel paint, which aims to solve the technical problems that in the prior art, the corrosion resistance of a stainless steel substrate is insufficient in a strong corrosion environment, the adhesive force of a paint film of the conventional stainless steel corrosion-resistant paint is low, the mechanical property of the paint film is poor, the paint film is easy to peel off along with the increase of the service life, the corrosion speed of the surface of the substrate is accelerated, and the service life of the stainless steel substrate is prolonged. In order to solve the technical problem, the application also provides a preparation method of the stainless steel paint. The application adopts the following scheme that the stainless steel paint comprises a primer and a finish paint which are sequentially coated on a stainless steel substrate; wherein, the stainless steel base material is subjected to surface activation treatment; the primer consists of 41-55 parts of polyurethane modified epoxy resin, 5-10 parts of silane coupling agent, 11-18 parts of modified filler A, 4-8 parts of nano zinc powder, 2-5 parts of functional auxiliary agent and 15-25 parts of solvent according to weight fraction; Wherein, the finishing paint comprises the following components, by weight, 35-48 parts of bisphenol A epoxy resin, 5-8 parts of polydimethylsiloxane, 13-15 parts of modified filler B, 2-5 parts of functional auxiliary agent and 15-25 parts of solvent; The modified filler A is fumed silica subjected to surface modification treatment of epoxy resin; The modified filler B is chitin nanofiber subjected to homogenization modification treatment; the polyurethane modified epoxy resin is obtained by mixing polyurethane resin and bisphenol A epoxy resin according to a mass ratio of 1:6; the silane coupling agent is mercaptopropyl trimethoxy silane; The solvent is selected from one or more of toluene, ethyl acetate, acetone and absolute ethyl alcohol, and in the practical implementation process, a proper solvent can be selected according to the drying rate requirement of an actual paint film. In some possible embodiments, the preparation method of the modified filler a comprises the following steps: Step 101, sequentially adding fumed silica, ethyl acetate, acetone and 2, 4-diisocyanate into a stirring kettle according to the mass ratio of 1 (5.5-6.5) (2-3.5) (6.2-8.1), and stirring for 20min at room temperature and 1200rpm to obtain a pre-reaction system; Step 102, transferring the pre-reaction system prepared in the step 101 into an ultrasonic reaction kettle, reacting for 5-7 hours under the conditions of water bath 90 ℃ and ultrasonic frequency of 20kHz-25kHz, filtering liquid phase, washing with ethyl acetate and drying in sequence to obtain a modified fumed silica intermediate; Step 103, sequentially adding the modified fumed silica intermediate prepared in the