A polymer with anti-corrosion and thermal insulation performance and a preparation method and application thereof

Abstract

The application discloses a polymer with anti-corrosion and heat insulation performance and a preparation method and application thereof. The polymer is obtained by mixing and hydrolyzing calcined silica aerogel powder, silane coupling agent SI-186 and phytic acid, has good water solubility and excellent oxidation resistance, and can be used as a filler to prepare anti-corrosion and heat insulation coating by compounding with water-soluble epoxy resin, water-based acrylic resin, water-based polyurethane resin and styrene-acrylic emulsion. The filler can rapidly and fully penetrate into a rusted position on a steel surface and be converted into a white organic iron polymer, so that a dense, firm and strongly-adhesive compound film is formed on the steel surface, and the steel base layer is no longer eroded.

Description

Technical Field

[0001] This invention belongs to the field of coating anti-corrosion and heat insulation technology, specifically relating to a polymer with anti-corrosion and heat insulation properties, its preparation method, and its application. Background Technology

[0002] Traditional coatings for corrosion protection require rigorous surface pretreatment, including sandblasting and shot blasting to remove rust. If the pretreatment quality does not meet the Sa2.5 standard, the coating quality cannot be guaranteed. Fillers, however, can convert iron oxide into a more stable substance, and their application is convenient, requiring only the cleaning of loose rust and dirt. Adding rust inhibitors to the filler formulation provides long-term, excellent protective performance.

[0003] Phytic acid is a cyclic phosphorus-containing organic acid. Its cyclic molecule contains six phosphate groups and twelve hydroxyl groups, thus exhibiting strong chelating properties and is widely used for corrosion inhibition and rust prevention in steel. Phytic acid is a rare multidentate chelating agent for metals. When chelating with metal ions, it readily forms multiple chelate rings, creating highly stable and acid-resistant chelates. Furthermore, it forms a dense monomolecular protective film on the metal surface, preventing the entry of O2 and water, further protecting the metal from rust.

[0004] Because phytic acid contains multiple active groups, it is prone to react with other components, thereby affecting the stability and shelf life of the coating. In addition, the chelating effect of phytic acid is affected by factors such as temperature, humidity and pH in the environment, which in turn affects the stability of the anti-corrosion performance of the coating. Therefore, when phytic acid is used in the preparation of composite coatings, other additives need to be added to adjust and balance the performance of the coating. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] In view of the problems existing in the above and / or prior art, the present invention is proposed.

[0007] Therefore, the purpose of this invention is to overcome the shortcomings of the prior art and provide a polymer with anti-corrosion and heat insulation properties.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: the polymer is obtained by hydrolysis reaction of silica aerogel, silane coupling agent SI-186 and phytic acid; wherein the mass ratio of silica aerogel, silane coupling agent SI-186 and phytic acid is 2:5:4 to 6.

[0009] Another object of the present invention is to provide a method for preparing a polymer with anti-corrosion and heat insulation properties.

[0010] To solve the above-mentioned technical problems, the present invention provides the following technical solution: including,

[0011] Calcined silica aerogel powder was dissolved in anhydrous ethanol. After adjusting the pH with a pH adjuster, the mixture was stirred at a constant temperature under oil bath heating. Then, silane coupling agent SI-186 was added, and the mixture was stirred magnetically. Phytic acid was then added, and the mixture was stirred continuously to obtain a light brown solution. The solution was filtered to obtain a solid, which is the polymer with anti-corrosion and heat insulation properties.

[0012] As a preferred embodiment of the polymer with anti-corrosion and heat insulation properties described in this invention, the calcination temperature of the silica aerogel powder is 450-550°C, and the calcination time is 5-7 hours.

[0013] As a preferred embodiment of the polymer with anti-corrosion and heat insulation properties described in this invention, the reaction is carried out under constant temperature stirring conditions in an oil bath, wherein the stirring temperature is 60-70°C and the stirring time is 5-7 hours.

[0014] As a preferred embodiment of the polymer with anti-corrosion and heat insulation properties described in this invention, wherein the pH adjuster is fumaric acid, and the pH is adjusted to 3-4.

[0015] As a preferred embodiment of the polymer with anti-corrosion and heat insulation properties described in this invention, the stirring speed of the magnetic stirring reaction is 400-600 r / min, and the stirring time is 5-7 h.

[0016] As a preferred embodiment of the polymer with anti-corrosion and heat insulation properties described in this invention, the reaction time of the continued stirring reaction is 3 to 5 hours.

[0017] Another object of the present invention is to provide an application of a polymer with anti-corrosion and heat-insulating properties in the preparation of coatings with anti-corrosion and heat-insulating properties.

[0018] Another object of the present invention is to provide a coating with anti-corrosion and heat insulation properties.

[0019] To solve the above-mentioned technical problems, the present invention provides the following technical solution: the coating contains 10-15% of the polymer described in claim 1 by weight percentage, and further includes one or more of water-soluble epoxy resin, water-based acrylic resin, water-based polyurethane resin, and styrene-acrylic emulsion.

[0020] Another object of the present invention is to provide a method for preparing a coating with anti-corrosion and heat insulation properties.

[0021] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A polymer with anti-corrosion and heat-insulating properties is added to a resin, and the mixture is stirred at a stirring speed of 600 r / min to 800 r / min for 20 to 40 minutes. Then, a curing agent is added, and the mixture is stirred at a stirring speed of 600 r / min to 800 r / min for another 20 to 40 minutes to obtain a coating with anti-corrosion and heat-insulating properties. The resin includes one or more of water-soluble epoxy resin, water-based acrylic resin, water-based polyurethane resin, and styrene-acrylic emulsion.

[0022] Beneficial effects of this invention:

[0023] The polymer synthesized in this invention, when used as a filler, can be combined with water-soluble epoxy resin, water-based acrylic resin, water-based polyurethane resin, and styrene-acrylic emulsion to prepare coatings with anti-corrosion and heat-insulating properties. This filler can quickly and fully penetrate into the rusted areas of the steel surface and transform into a white organic iron polymer, thereby generating a dense, firm, and strongly adhered composite film on the steel surface, preventing further corrosion of the steel substrate. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0025] Figure 1 This is a schematic diagram of the polymer synthesis route in Example 1 of the present invention.

[0026] Figure 2 This is a flowchart of the polymer preparation process in Example 1 of the present invention.

[0027] Figure 3 The image shows the infrared spectrum of the polymer obtained in Example 1 of this invention.

[0028] Figure 4 The corrosion resistance of the coatings formed in Example 2 and Comparative Example 7 of this invention is demonstrated. Detailed Implementation

[0029] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the examples in the specification.

[0030] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0032] Unless otherwise specified, all raw materials used in this invention are commercially available in the field. The silica aerogel is a commercially available hydrophobic fumed silica with model number HB-139HB-151, purchased from Hubei Huifu Nanomaterials Co., Ltd. The silane coupling agent SI-186 is purchased from Shanghai Maclean Biochemical Technology Co., Ltd., and the phytic acid is inositol hexaphosphate, purchased from Tongxiang Xinrui Biotechnology Co., Ltd.

[0033] Example 1

[0034] This embodiment provides a method for preparing a polymer with anti-corrosion and heat-insulating properties, the synthetic route is as follows: Figure 1 As shown, the specific synthesis method is as follows:

[0035] 4g of calcined silica aerogel powder was added to a three-necked flask. The silica aerogel powder was calcined at 500℃ for 6 hours. Fumaric acid was added to adjust the pH to 3.5, and the mixture was heated in an oil bath to 65℃. Then, 10g of silane coupling agent SI-186 was added. The mixture was stirred with a magnetic stirrer at 500r / min for 6 hours. 10g of phytic acid was added again, and the mixture was stirred for another 4 hours to obtain a light brown solution. The solid was then obtained by filtration, which is the polymer prepared in this example.

[0036] Figure 2 This is a photograph of the polymer obtained in this embodiment. Figure 3 Its infrared spectrum analysis diagram, Figure 3 Middle, 1108cm -1 and 811cm -1 The strong absorption band and broad absorption band nearby represent the antisymmetric and symmetric stretching vibrations of Si-O-Si, respectively, at 2931 cm⁻¹. -1 The new peak at this location is the methylene (-CH2-) vibration peak generated by the hydrolysis of the silane coupling agent, which proves that SiO2gel has been converted into Si 186 Successful modification; PA-Si 186 -SiO2 spectrum at 1752 cm⁻¹ -1Spectral bands at the location and PO4 3- Group-related, the band shifted to 1632 cm⁻¹. -1 This indicates that the phosphate groups of PA and the hydrolyzed CO groups have successfully crosslinked and bonded.

[0037] Comparative Example 1

[0038] The difference between this embodiment and Example 1 is that the amount of phytic acid added was adjusted to 6g, while the rest of the preparation process was the same as in Example 1. As a result, the reaction was incomplete and the product synthesis rate was low.

[0039] Comparative Example 2

[0040] The difference between this embodiment and Embodiment 1 is that the amount of phytic acid added was adjusted to 14g, while the rest of the preparation process was the same as in Embodiment 1. As a result, the reaction was saturated, resulting in a waste of phytic acid raw materials.

[0041] Comparative Example 3

[0042] The difference between this comparative example and Example 1 is that the pH was adjusted to 6 after adding fumaric acid, and the product of Example 1 could not be synthesized.

[0043] Comparative Example 4

[0044] The difference between this comparative example and Example 1 is that when the oil bath temperature was adjusted to 40°C, the product of Example 1 of the present invention could not be synthesized.

[0045] Comparative Example 5

[0046] The difference between this comparative example and Example 1 is that when the oil bath temperature was adjusted to 50°C, the product of Example 1 of the present invention could not be synthesized.

[0047] Comparative Example 6

[0048] The difference between this comparative example and Example 1 is that when using uncalcined silica aerogel powder for the experiment, the product of Example 1 of the present invention could not be synthesized.

[0049] Example 2

[0050] This embodiment provides an anti-corrosion and heat-insulating coating prepared using the polymer obtained in Example 1. Specifically, the coating is formulated according to the following recipe:

[0051] Take 3g of filler (polymer of Example 1) and add it to 11g of epoxy resin E51. Mix and stir at a stirring speed of 700r / min for 30 minutes. Then add 6g of curing agent D400 and continue mixing and stirring at a stirring speed of 700r / min for 30 minutes to obtain a composite coating with a filler content of 15%. Apply the coating to the surface of Q235 steel.

[0052] Example 3

[0053] The difference between this embodiment and Embodiment 2 is that the filler content in the composite coating is adjusted to 10%, specifically:

[0054] Take 2g of filler (polymer of Example 1) and add it to 11.5g of epoxy resin E51. Mix and stir at a stirring speed of 700r / min for 30 minutes. Then add 6.5g of curing agent D400 and continue to mix and stir at a stirring speed of 700r / min for 30 minutes to obtain a composite coating with a filler content of 10%, and apply it to the surface of Q235 steel.

[0055] Example 4

[0056] The difference between this embodiment and Embodiment 2 is that the filler content in the composite coating is adjusted to 20%, specifically:

[0057] Take 4g of filler (polymer of Example 1) and add it to 10.5g of epoxy resin E51. Mix and stir at a stirring speed of 700r / min for 30 minutes. Then add 5.5g of curing agent D400 and continue to mix and stir at a stirring speed of 700r / min for 30 minutes to obtain a composite coating with a filler content of 20%, and apply it to the surface of Q235 steel.

[0058] Comparative Example 7

[0059] The difference between this comparative example and Example 2 is that a filler-free composite coating was prepared, specifically:

[0060] Take 14g of epoxy resin E51 and 10g of curing agent D400, mix and stir at a stirring speed of 600-800r / min for 30 minutes, and then apply to the surface of Q235 steel.

[0061] Application testing

[0062] The application effects of the composite coatings prepared in Examples 2-3 and Comparative Example 7 were tested by pull-out test for adhesion, salt spray test for corrosion resistance, and thermal insulation performance, and the results are shown in Tables 1-3.

[0063] Table 1 Comparison of adhesion of different coatings

[0064]

[0065] As can be seen from Table 1, since the phytic acid in the filler can easily form multiple chelate rings with metal ions, forming a chelate with extremely strong stability and acid resistance, the coatings prepared using the fillers in Examples 2 to 4 of this invention have significantly improved adhesion compared to coatings without the filler. However, excessive filler content may affect the drying and curing process of the coating, leading to structural loosening and decomposition during the curing process, thereby reducing the adhesion between the coating and the substrate.

[0066] Table 2 Comparison of salt spray test results for different coatings

[0067] Comparative Example 7 Example 2 Example 3 Example 4 Salt spray time 162 203 192 188

[0068] The anti-corrosion performance of the coating of this invention was further studied through salt spray testing. Figure 4 Table 2 shows the salt spray resistance times of different coating samples after 336 hours of salt spray testing following scratching of the coating samples from Example 2 and Comparative Example 7. Figure 4 It can be seen that, comparative example 7 ( Figure 4 The corrosion products (left) diffuse from the scratched area into the pure WEP coating, indicating a rapid corrosion reaction. Therefore, pure epoxy resin coatings have weak barrier properties and short service life, significantly limiting their industrial applications. When the filler prepared in Example 1 of this invention is introduced into the epoxy resin, corrosion around the scratched area is significantly reduced. Figure 4 (Right). To inhibit corrosion, phytic acid is used to anchor iron cations and form PO-Fe bonds, which in turn form a dense, cross-linked chelate layer on the metal surface as a protective film for the metal matrix.

[0069] Table 3 Comparison of thermal insulation performance of different coatings

[0070] Sample filler content Comparative Example 7 Example 2 Example 3 Example 4 Heat transfer coefficient W / (m²·K) 0.2231 0.1257 0.1543 0.1883

[0071] As can be seen from Table 3, the thermal conductivity of the sample with added filler is much lower than that of the sample without filler. The filler content has a significant impact on the thermal insulation performance of the coating. Excessive content will cause the fillers to be too tightly packed, reducing the formation of air layers in the coating and thus reducing the thermal insulation performance. Therefore, it is necessary to strictly control the amount of filler.

[0072] In summary, this invention relates to a polymer with good water solubility and excellent antioxidant properties, possessing anti-corrosion and heat insulation properties, obtained through a mixed hydrolysis reaction of calcined silica aerogel powder, silane coupling agent SI-186, and phytic acid. The invention also includes its preparation method and application. This polymer, used as a filler, can be compounded with water-soluble epoxy resin, water-based acrylic resin, water-based polyurethane resin, and styrene-acrylic emulsion to prepare coatings with anti-corrosion and heat insulation properties. This filler can quickly and fully penetrate into the rusted areas of steel surfaces and transform into a white organic iron polymer, thereby forming a dense, strong, and highly adhesive composite film on the steel surface, preventing further corrosion of the steel substrate.

[0073] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A polymer with anti-corrosion and heat-insulating properties, characterized in that: The polymer is obtained by hydrolysis of silica aerogel, silane coupling agent SI-186 and phytic acid, wherein the mass ratio of silica aerogel, silane coupling agent SI-186 and phytic acid is 2:5:4~6. The preparation method of the polymer is as follows: Calcined silica aerogel powder was dissolved in anhydrous ethanol. After adjusting the pH with a pH adjuster, the mixture was stirred at a constant temperature under oil bath heating. Then, silane coupling agent SI-186 was added, and the mixture was stirred magnetically. Phytic acid was then added, and the mixture was stirred continuously to obtain a light brown solution. The solid was obtained by filtration, which yielded a polymer with anti-corrosion and heat insulation properties. The silica aerogel powder is calcined at 450-550℃ for 5-7 hours; the reaction is carried out under constant temperature stirring in an oil bath, with the stirring temperature at 60-70℃ for 5-7 hours; and the pH adjuster is fumaric acid, with the pH adjusted to 3-4.

2. The method for preparing the polymer with anti-corrosion and heat-insulating properties as described in claim 1, characterized in that: The stirring speed of the magnetic stirring reaction is 400~600 r / min, and the stirring time is 5~7 h.

3. The method for preparing the polymer with anti-corrosion and heat-insulating properties as described in claim 1, characterized in that: The reaction time for the continued stirring is 3-5 hours.

4. The application of the polymer with anti-corrosion and heat insulation properties as described in claim 1 in the preparation of coatings with anti-corrosion and heat insulation properties.

5. A coating with anti-corrosion and heat insulation properties, characterized in that: The coating comprises 10-15% of the polymer described in claim 1 by weight, and further comprises one or more of water-soluble epoxy resin, water-based acrylic resin, water-based polyurethane resin, and styrene-acrylic emulsion.

6. The method for preparing the coating with anti-corrosion and heat-insulating properties as described in claim 5, characterized in that: The method includes adding the polymer described in claim 1 to a resin, mixing and stirring at a stirring speed of 600 r / min to 800 r / min for 20 to 40 minutes, then adding a curing agent and continuing to mix and stir at a stirring speed of 600 r / min to 800 r / min for another 20 to 40 minutes to obtain a coating with anti-corrosion and heat insulation properties; wherein the resin includes one or more of water-soluble epoxy resin, water-based acrylic resin, water-based polyurethane resin, and styrene-acrylic emulsion.

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