An antistatic inorganic anticorrosive coating and its preparation method

Abstract

This invention belongs to the field of building corrosion protection and discloses an antistatic inorganic anticorrosive coating and its preparation method. The coating comprises the following components: modified potassium silicate, alkyl silicate, acid and alkali resistant filler, stabilizer, ionic liquid, and water. The antistatic inorganic anticorrosive coating of this invention improves antistatic performance and effectively solves the problem of integrated waterproofing and corrosion protection.

Description

Technical Field

[0001] This invention belongs to the field of building corrosion protection, and more specifically, relates to an antistatic inorganic anticorrosive coating and its preparation method. Background Technology

[0002] Inorganic coatings typically refer to a class of coatings that use inorganic materials as the main film-forming substance or binder. Silicates are commonly used inorganic film-forming substances in architectural coatings. Inorganic silicate coatings have excellent weather resistance, with a lifespan exceeding 100 years. Furthermore, inorganic silicate coatings possess advantages such as fire resistance, antibacterial and mildew resistance, environmental friendliness, extremely low volatile organic compound (VOC) content, and zero formaldehyde. Today, inorganic silicate coatings account for 10%–15% of the water-based architectural coatings market in some regions, and have achieved significant development in other architectural coatings markets. However, in some regions, the development of inorganic architectural coatings started later and has been slower, with few mature products currently available on the market. Inorganic coatings possess excellent properties such as strong adhesion, strong weather resistance, high temperature resistance, and good wear resistance. They also offer advantages such as being environmentally friendly and having abundant raw material sources, representing the direction of development in the coatings industry and possessing significant research value. However, in some industrial building sectors, due to their special environment, there are high requirements for antistatic properties, alkali resistance, and impermeability, which limits the use and industrialization of inorganic coatings. They can only have a certain market space in the home decoration interior wall sector, which is difficult to meet the needs of the rapidly developing market.

[0003] CN114507458A discloses a highly stain-resistant and antistatic inorganic interior wall coating and its preparation method. It employs a compound of silica sol, silicates, and polytetrafluoroethylene (PTFE) wax powder, giving the interior wall inorganic coating Class A fire resistance. The antistatic agent provides antistatic properties; the PTFE wax powder significantly improves the coating system's performance. This coating can withstand temperatures up to 1200℃, is flame-retardant, and does not produce harmful gases. This invention patent uses N-doped carbon nanotubes as the antistatic agent, exhibiting good antistatic effects. However, it does not address the shortcomings of silicates in alkali resistance or their application in corrosion prevention. CN112646432A discloses a low-film-thickness, high-corrosion-resistant water-based inorganic coating composition and its preparation method. The composition comprises the following components by weight percentage: 35.0–45.0% aqueous inorganic polymer, 1.8–5.5% functional additives, 12.0–20.0% filler composition, 0.02–0.05% graphene, 10.0–12.0% pigment composition, 2.5–8.5% silica sol, 0.8–3.0% film-forming aids, and the balance being deionized water. This invention uses vinylidene fluoride, butyl methacrylate, acrylic acid, and styrene as the main monomers, ammonium persulfate as the initiator, and AEO and MES as the main emulsifier system. Furthermore, a nonionic surfactant containing double bonds is added to the emulsion system, improving the corrosion resistance of steel structures. Simultaneously, the additives used in this low-film-thickness, high-corrosion-resistance aqueous inorganic coating composition are more environmentally friendly. This invention patent improves the corrosion resistance of steel structures by modifying inorganic materials based on acrylic polymer monomers, but does not address the corrosion and waterproofing of concrete.

[0004] Therefore, there is an urgent need to propose an antistatic inorganic anticorrosive coating and its preparation method. Summary of the Invention

[0005] The purpose of this invention is to address the problems of poor antistatic, waterproof, and anticorrosive performance of current inorganic coatings used in interior and exterior applications in industrial buildings. This invention proposes an antistatic inorganic anticorrosive coating and its preparation method. The antistatic inorganic anticorrosive coating of this invention improves antistatic performance and effectively solves the problem of integrated waterproofing and anticorrosive properties.

[0006] To achieve the above objectives, the present invention provides an antistatic inorganic anticorrosive coating, the coating comprising the following components: modified potassium silicate, alkyl silicate, acid and alkali resistant filler, stabilizer, ionic liquid and water.

[0007] According to the present invention, preferably, the coating comprises the following components in parts by weight: 10-50 parts modified potassium silicate, 1-10 parts alkyl silicate, 20-50 parts acid and alkali resistant filler, 0.1-1 parts stabilizer, 1-10 parts ionic liquid and 8-12 parts water.

[0008] According to the present invention, preferably, the coating comprises the following components in parts by weight: 40-50 parts modified potassium silicate, 2-7 parts alkyl silicate, 30-40 parts acid and alkali resistant filler, 0.1-0.5 parts stabilizer, 1-5 parts ionic liquid and 8-12 parts water.

[0009] According to the present invention, preferably, the method for preparing the modified potassium silicate includes: mixing and stirring a copolymer emulsion, a coupling agent and an aqueous solution of potassium silicate, and then reacting them to obtain the modified potassium silicate.

[0010] According to the present invention, preferably, the ratio of the amount of the copolymer emulsion, the coupling agent and the potassium silicate aqueous solution is (95-105):(1-5):(45-55).

[0011] According to the present invention, preferably, the mass fraction of potassium silicate in the potassium silicate aqueous solution is 25-40%.

[0012] According to the present invention, preferably, the coupling agent is at least one selected from dicyclohexanediimide, N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, diethylenetriaminepropyltrimethoxysilane, and ureopropyltrimethoxysilane.

[0013] According to the present invention, preferably, the potassium silicate is potassium silicate with a modulus of 5.5 or higher.

[0014] According to the present invention, preferably, the acrylic acid content in the copolymer emulsion is ≥1%, and the emulsion content is 98.8%-99.2% based on the total weight of the copolymer emulsion, and the emulsifier content is 0.8%-1.2%.

[0015] The emulsion is at least one of styrene-acrylic emulsion, pure acrylic emulsion, and vinyl acetate-acrylic emulsion;

[0016] The emulsifier is a nonionic emulsifier, or a complex of a nonionic emulsifier and anionic emulsifier.

[0017] According to the present invention, preferably, the content of the nonionic emulsifier is >50% based on the total weight of the complex of the nonionic emulsifier and the anionic emulsifier.

[0018] According to the present invention, preferably, the nonionic emulsifier is at least one selected from octylphenol polyoxyethylene ether, dodecyl polyoxyethylene ether, and oleyl alcohol polyoxyethylene ether.

[0019] According to the present invention, preferably, the potassium silicate is added dropwise to the mixture of the copolymer emulsion and the coupling agent.

[0020] According to the present invention, preferably, the reaction time is 3.5-4.5 hours.

[0021] According to the present invention, preferably, the alkyl silicate is one of potassium methylsilicate, potassium ethylsilicate, potassium propylsilicate, and tetrapropoxysilane.

[0022] According to the present invention, preferably, the acid and alkali resistant filler is at least one selected from quartz powder, titanium dioxide, feldspar powder, talc powder and diabase powder.

[0023] According to the present invention, preferably, the stabilizer is a quaternary ammonium salt complex, preferably benzyltriethylammonium chloride and / or tetrabutylammonium hydrogen sulfate.

[0024] According to the present invention, preferably, the ionic liquid is at least one selected from 1-ethyl-3-methylimidazolium acetate, 1-ethyl-3-methylimidazolium tetrachloroaluminate, 1-ethyl-3-methylimidazolium tetrafluoroborate and 1-methyl-3-ethylimidazolium hexafluorophosphate.

[0025] Another aspect of the present invention provides a method for preparing the aforementioned antistatic inorganic anticorrosive coating, the method comprising: mixing and stirring the modified potassium silicate, alkyl silicate, acid and alkali resistant filler, stabilizer, ionic liquid and water evenly to obtain the antistatic inorganic anticorrosive coating.

[0026] In this invention, the antistatic inorganic anticorrosive coating is a single-component coating.

[0027] According to the present invention, preferably, the mixing and stirring rate is 500-1000 r / min.

[0028] The beneficial effects of the technical solution of the present invention are as follows:

[0029] The antistatic inorganic anticorrosive coating of this invention enhances the antistatic performance of inorganic coatings by incorporating a compatible ionic liquid. Ionic liquids, as novel antistatic materials, possess excellent physical properties and exhibit stable antistatic effects.

[0030] This invention employs a combination of special potassium silicate with a modulus of 5.5 or higher and alkyl silicates. Through the condensation reaction of the silanol groups of both materials and the condensation reaction of the combined silanol groups, the water resistance of the coating is improved. Furthermore, this invention uses coupling agents with different compositions and structures in the preparation of modified potassium silicate, employing grafting technology to polymerize the potassium silicate. This allows the organic-inorganic system of this invention to form a cross-linked network structure, thereby improving the acid corrosion resistance of the coating. Simultaneously, the preparation of modified potassium silicate transforms the organic-inorganic system of this invention into an emulsion-coated silicate reaction system, effectively enhancing the impermeability and alkali resistance of the coating.

[0031] The coating of this invention also has fire-retardant properties. The production of this coating can be completed using conventional coating production equipment; the production process is simple and easy to control; it does not contain toxic or harmful substances; the production process does not require special equipment or use toxic solvents; and it is easy to mass-produce.

[0032] Other features and advantages of the present invention will be described in detail in the following detailed description section. Detailed Implementation

[0033] Preferred embodiments of the invention will now be described in more detail. While preferred embodiments of the invention are described below, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0034] Example 1

[0035] This embodiment provides an antistatic inorganic anticorrosive coating, which comprises the following components by weight: 48 parts modified potassium silicate, 4 parts tetrapropoxysilane, 28 parts quartz powder, 8 parts titanium dioxide, 0.3 parts benzyltriethylammonium chloride, 2 parts 1-methyl-3-ethylimidazolium hexafluorophosphate ionic liquid, and 10 parts water.

[0036] The method for preparing the modified potassium silicate includes: adding 100 parts of copolymer emulsion into a stirred tank, adding 2 parts of dicyclohexanediimide, stirring for 5 minutes, and then slowly adding 50 parts of potassium silicate aqueous solution (mass fraction of 28%, modulus of 6.0). After the addition is complete, the reaction is carried out for 4 hours to obtain the modified potassium silicate.

[0037] The copolymer emulsion contains ≥1% acrylic acid, and based on the total weight of the copolymer emulsion, the emulsion content is 99%, and the emulsifier content is 1%.

[0038] The emulsion is a pure acrylic emulsion;

[0039] The emulsifier is dodecyl polyoxyethylene ether;

[0040] The preparation method of the above-mentioned antistatic inorganic anticorrosive coating includes: mixing and stirring the above components evenly (stirring rate is 800 / min) to obtain the antistatic inorganic anticorrosive coating.

[0041] The antistatic inorganic anticorrosive coating obtained in this embodiment was tested according to GB / T 9755-2014 "Synthetic Resin Emulsion Exterior Wall Coatings" and JT / T821-2011 "Anticorrosive Coatings for Concrete Bridge Structures", with a coating thickness of 200 μm, as well as the performance indicators of standards HG / T 2661-1995 "Chlorosulfonated Polyethylene Anticorrosive Coatings" and GB / T27789-2011 "Epoxy Asphalt Anticorrosive Coatings". The results are shown in Table 1.

[0042] Table 1

[0043]

[0044] Example 2

[0045] This embodiment provides an antistatic inorganic anticorrosive coating, which comprises the following components by weight: 45 parts modified potassium silicate, 6 parts methyl potassium silicate, 23 parts feldspar powder, 12 parts titanium dioxide, 0.3 parts benzyl triethylammonium chloride, 4 parts 1-ethyl-3-methylimidazolium tetrafluoroborate ionic liquid, and 10 parts water.

[0046] The method for preparing the modified potassium silicate includes: adding 100 parts of copolymer emulsion into a stirred tank, adding 5 parts of N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, stirring for 5 minutes, and then slowly adding 50 parts of potassium silicate aqueous solution (mass fraction of 32%, modulus of 5.8). After the addition is complete, the reaction is carried out for 4 hours to obtain the modified potassium silicate.

[0047] The copolymer emulsion contains ≥1% acrylic acid, and based on the total weight of the copolymer emulsion, the emulsion content is 99%, and the emulsifier content is 1%.

[0048] The emulsion is a styrene-acrylic emulsion;

[0049] The emulsifier is a nonionic emulsifier, oleyl alcohol polyoxyethylene ether;

[0050] The preparation method of the above-mentioned antistatic inorganic anticorrosive coating includes: mixing and stirring the above components evenly (stirring rate is 1000 r / min) to obtain the antistatic inorganic anticorrosive coating.

[0051] The antistatic inorganic anticorrosive coating obtained in this embodiment was tested according to the test method of Example 1, and the results are shown in Table 2.

[0052] Table 2

[0053]

[0054]

[0055] Example 3

[0056] This embodiment provides an antistatic inorganic anticorrosive coating, which comprises the following components by weight: 40 parts modified potassium silicate, 6 parts potassium propyl silicate, 26 parts talc, 8 parts titanium dioxide, 0.3 parts tetrabutylammonium hydrogen sulfate, 6 parts 1-ethyl-3-methylimidazolium tetrachloroaluminate ionic liquid, and 10 parts water.

[0057] The method for preparing the modified potassium silicate includes: adding 100 parts of copolymer emulsion into a stirred tank, adding 3 parts of ureopropyltrimethoxysilane, stirring for 5 minutes, and then slowly adding 50 parts of potassium silicate aqueous solution (mass fraction of 32%, modulus of 5.8). After the addition is complete, the reaction is carried out for 4 hours to obtain the modified potassium silicate.

[0058] The copolymer emulsion contains ≥1% acrylic acid, and based on the total weight of the copolymer emulsion, the emulsion content is 99%, and the emulsifier content is 1%.

[0059] The emulsion is an acetate-acrylic emulsion;

[0060] The emulsifier is 80% nonionic emulsifier octylphenol polyoxyethylene ether and 20% anionic emulsifier sodium dodecyl sulfate.

[0061] The preparation method of the above-mentioned antistatic inorganic anticorrosive coating includes: mixing and stirring the above components evenly (stirring rate is 800 r / min) to obtain the antistatic inorganic anticorrosive coating.

[0062] The antistatic inorganic anticorrosive coating obtained in this embodiment was tested according to the test method of Example 1, and the results are shown in Table 3.

[0063] Table 3

[0064]

[0065] Example 4

[0066] This embodiment provides an antistatic inorganic anticorrosive coating, which comprises the following components by weight: 35 parts modified potassium silicate, 10 parts potassium methyl silicate, 25 parts diabase powder, 18 parts titanium dioxide, 0.3 parts tetrabutylammonium hydrogen sulfate, 2 parts 1-ethyl-3-methylimidazolium acetate ionic liquid, and 10 parts water.

[0067] The method for preparing the modified potassium silicate includes: adding 100 parts of copolymer emulsion into a stirred tank, adding 4 parts of diethylenetriaminopropyltrimethoxysilane, stirring for 5 minutes, and then slowly adding 50 parts of potassium silicate aqueous solution (mass fraction of 25%, modulus of 6.5). After the addition is complete, the reaction is carried out for 4 hours to obtain the modified potassium silicate.

[0068] The copolymer emulsion contains ≥1% acrylic acid, and based on the total weight of the copolymer emulsion, the emulsion content is 99%, and the emulsifier content is 1%.

[0069] The emulsion is a styrene-acrylic emulsion;

[0070] The emulsifier is a nonionic emulsifier, specifically dodecyl polyoxyethylene ether.

[0071] The preparation method of the above-mentioned antistatic inorganic anticorrosive coating includes: mixing and stirring the above components evenly (stirring rate is 1000 / min) to obtain the antistatic inorganic anticorrosive coating.

[0072] The antistatic inorganic anticorrosive coating obtained in this embodiment was tested according to the test method of Example 1, and the results are shown in Table 4.

[0073] Table 4

[0074]

[0075]

[0076] Example 5

[0077] This embodiment provides an antistatic inorganic anticorrosive coating, which comprises the following components by weight: 50 parts modified potassium silicate, 4 parts tetrapropoxysilane, 26 parts quartz powder, 9 parts titanium dioxide, 0.3 parts benzyltriethylammonium chloride, 3 parts 1-methyl-3-ethylimidazolium hexafluorophosphate ionic liquid, and 10 parts water.

[0078] The method for preparing the modified potassium silicate includes: adding 100 parts of copolymer emulsion into a stirred tank, adding 2 parts of dicyclohexanediimide, stirring for 5 minutes, and then slowly adding 50 parts of potassium silicate aqueous solution (mass fraction of 28%, modulus of 6.3 or higher). After the addition is complete, the reaction is carried out for 4 hours to obtain the modified potassium silicate.

[0079] The copolymer emulsion contains ≥1% acrylic acid, and based on the total weight of the copolymer emulsion, the emulsion content is 99%, and the emulsifier content is 1%.

[0080] The emulsion is an acetate-acrylic emulsion;

[0081] The emulsifier is 60% nonionic emulsifier octylphenol polyoxyethylene ether and 40% anionic emulsifier sodium dodecylbenzenesulfonate.

[0082] The preparation method of the above-mentioned antistatic inorganic anticorrosive coating includes: mixing and stirring the above components evenly (stirring rate is 800 r / min) to obtain the antistatic inorganic anticorrosive coating.

[0083] The antistatic inorganic anticorrosive coating obtained in this embodiment was tested according to the test method of Example 1, and the results are shown in Table 5.

[0084] Table 5

[0085]

[0086]

[0087] Example 6

[0088] This embodiment provides an antistatic inorganic anticorrosive coating, which comprises the following components by weight: 43 parts modified potassium silicate, 7 parts ethyl potassium silicate, 31 parts quartz powder, 7 parts titanium dioxide, 0.3 parts tetrabutylammonium hydrogen sulfate, 2 parts 1-ethyl-3-methylimidazolium tetrachloroaluminate ionic liquid, and 10 parts water.

[0089] The method for preparing the modified potassium silicate includes: adding 100 parts of copolymer emulsion into a stirred tank, adding 3 parts of ureopropyltrimethoxysilane, stirring for 5 minutes, and then slowly adding potassium silicate aqueous solution (mass fraction of 30%, modulus of 5.8 parts, reacting for 4 hours after the addition is complete to obtain modified potassium silicate;

[0090] The copolymer emulsion contains ≥1% acrylic acid, and based on the total weight of the copolymer emulsion, the emulsion content is 99%, and the emulsifier content is 1%.

[0091] The emulsion is a styrene-acrylic emulsion;

[0092] The emulsifier is a nonionic emulsifier, octylphenol polyoxyethylene ether.

[0093] The preparation method of the above-mentioned antistatic inorganic anticorrosive coating includes: mixing and stirring the above components evenly (stirring rate is 1000 / min) to obtain the antistatic inorganic anticorrosive coating.

[0094] The antistatic inorganic anticorrosive coating obtained in this embodiment was tested according to the test method of Example 1, and the results are shown in Table 6.

[0095] Table 6

[0096]

[0097]

[0098] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. An antistatic inorganic anticorrosive coating characterized by comprising, The coating comprises the following components by weight parts: modified potassium silicate 10-50 parts, alkyl silicate 1-10 parts, acid and alkali resistant filler 20-50 parts, stabilizer 0.1-1 part, ionic liquid 1-10 parts and water 8-12 parts; The preparation method of the modified potassium silicate comprises the following steps: mixing, stirring and reacting a copolymer emulsion, a coupling agent and a potassium silicate aqueous solution to obtain the modified potassium silicate; The usage ratio of the copolymer emulsion, the coupling agent and the potassium silicate aqueous solution is (95-105):(1-5):(45-55); The mass fraction of potassium silicate in the potassium silicate aqueous solution is 25-40%; The potassium silicate is potassium silicate with a modulus of 5.5 or more; The content of acrylic acid in the copolymer emulsion is ≥1%, the content of the emulsion is 98.8%-99.2% and the content of the emulsifier is 0.8%-1.2% based on the total weight of the copolymer emulsion; The emulsion is at least one of a styrene-acrylic emulsion, a pure acrylic emulsion and an acrylic-vinyl acetate emulsion; The emulsifier is a non-ionic emulsifier or a composite of a non-ionic emulsifier and an anionic emulsifier; The content of the non-ionic emulsifier is >50% based on the total weight of the composite of the non-ionic emulsifier and the anionic emulsifier; The non-ionic emulsifier is at least one of octylphenol polyoxyethylene ether, dodecyl polyoxyethylene ether and oleyl polyoxyethylene ether; The ionic liquid is at least one of 1-ethyl-3-methylimidazole acetate, 1-ethyl-3-methylimidazole tetrachloroaluminate, 1-ethyl-3-methylimidazole tetrafluoroborate and 1-methyl-3-ethylimidazole hexafluorophosphate; The coupling agent is at least one of dicyclohexyl carbodiimide, N-β-(aminoethyl)-γ-aminopropyl trimethoxysilane, diethylenetriamine propyl trimethoxysilane and ureido propyl trimethoxysilane.

2. The anti-static inorganic anticorrosive paint according to claim 1, wherein The coating comprises the following components by weight parts: modified potassium silicate 10-50 parts, alkyl silicate 1-10 parts, acid and alkali resistant filler 20-50 parts, stabilizer 0.1-1 part, ionic liquid 1-10 parts and water 8-12 parts; 3. The anti-static inorganic anticorrosive coating according to claim 1, wherein, The potassium silicate is added to the mixture of the copolymer emulsion and the coupling agent in a dropwise manner; The reaction time is 3.5-4.5 h.

4. The anti-static inorganic anticorrosive coating according to claim 1 or 2, wherein, The alkyl silicate is one of methyl potassium silicate, ethyl potassium silicate and propyl potassium silicate; The acid and alkali resistant filler is at least one of quartz powder, titanium dioxide, feldspar powder, talc powder and diabase powder; The stabilizer is a complex of quaternary ammonium salt.

5. The anti-static inorganic anticorrosive coating according to claim 4, wherein, The stabilizer is benzyltriethylammonium chloride and / or tetrabutylammonium hydrogen sulfate.

6. The process for the preparation of the antistatic inorganic anticorrosive paint according to any one of claims 1-5, characterized in that, The preparation method comprises the following steps: uniformly mixing, stirring the modified potassium silicate, the alkyl silicate, the acid and alkali resistant filler, the stabilizer, the ionic liquid and the water to obtain the anti-static inorganic anticorrosive coating.

7. The method for preparing an antistatic inorganic anticorrosive paint according to claim 6, wherein The mixing and stirring rate is 500-1000 r / min.

Images