High-temperature-resistant and corrosion-resistant inorganic coating and preparation process thereof

Abstract

The invention discloses a high-temperature-resistant and corrosion-resistant inorganic coating and a preparation process thereof, and relates to the technical field of anti-corrosion materials. The preparation method comprises the following steps: putting dihydric phosphate, a retarder and nano aluminum powder into a speed-adjustable mortar stirrer, stirring and mixing, simultaneously adding water to enable a composite product to be in a viscous state, stopping stirring after stirring, adding an inorganic gelling binder powder, an anti-rust pigment and a curing agent, stirring and mixing to obtain the phosphate inorganic gelling binder. After the phosphate inorganic gelling binder is in a flowing slurry state, adding the filler after stirring, adding water during stirring to increase the flowability of the inorganic coating until the flowability requirement of the field construction coating is met, and adjusting the flowability of the mixed slurry to obtain the high-temperature-resistant and corrosion-resistant inorganic coating. The coating prepared by the invention has excellent corrosion resistance and high temperature resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of anti-corrosion materials, and in particular to a high-temperature resistant and corrosion-resistant inorganic coating and a preparation process thereof. Background Art

[0002] Phosphate cementitious materials have many advantages such as high refractoriness, strong corrosion resistance, superior electrical properties, and good thermal shock resistance. Therefore, they have attracted the attention of scientific researchers from all over the world and have attracted great attention. As a result, a large number of experimental explorations have been carried out, opening up broad prospects for the application of phosphate cementitious materials. In addition to being widely used in dentistry, phosphate cementitious materials can also be used to prepare refractory concrete or prefabricated components through methods such as tamping, vibration and semi-dry pressing, and used for direct pouring and coating to make linings for metallurgical industry and other high-temperature kilns. They can also be used in extreme environments, such as impact jet engine combustion. Phosphate-based inorganic coatings play a crucial role in the field of inorganic coatings. They offer numerous advantages, including being colorless and odorless, withstanding temperatures between 1300°C and 1600°C, exhibiting excellent water resistance, providing strong adhesion to substrates, and offering superior corrosion resistance. They are also economically viable, pose minimal pollution, and offer a high level of safety without the risk of combustion or explosion.

[0003] Phosphate-based inorganic anticorrosion coatings are typically made with phosphates as a binder, supplemented with additives, curing agents, and various fillers. The performance of phosphate-based anticorrosion coatings effectively meets the application requirements of metal machinery and equipment in fields such as high-temperature pipelines, power transmission, high-temperature chemical engineering, and aerospace. Furthermore, while meeting the performance requirements of phosphate-based inorganic anticorrosion coatings, they also offer the highest degree of environmental friendliness, a key factor driving their development and research. Furthermore, based on current research, my country's research on aluminum phosphate adhesives lags behind international standards. Therefore, to meet national development needs and promote modernization, research on low-cost, high-performance aluminum phosphate adhesives is urgently needed, which is also crucial for strengthening research on phosphate-based inorganic anticorrosion coatings. Summary of the Invention

[0004] The purpose of the present invention is to provide a high temperature resistant and corrosion resistant inorganic coating and a preparation process thereof, so as to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A high temperature resistant and corrosion resistant inorganic coating is composed of the following raw materials in parts by weight:

[0007]

[0008] The anti-rust pigment is any one or more of aluminum tripolyphosphate and aluminum dihydrogen tripolyphosphate.

[0009] The retarder is any one or more of borax and boric acid.

[0010] The curing agent is pretreated over-burned magnesium oxide.

[0011] The preparation process of the pretreated overburned magnesium oxide is as follows: overburned magnesium oxide and silica sol are placed in a mixer at a mass ratio of 1:10-1:20, and stirred and mixed for 20-30 minutes at a rotation speed of 400-600 r / min to obtain the pretreated overburned magnesium oxide.

[0012] The retarder is any one or more of borax and boric acid.

[0013] The preparation process of the high temperature resistant and corrosion resistant inorganic coating is as follows:

[0014] (1) Taking 0.3-0.5 parts of kaolin, 0.3-0.5 parts of limestone powder, and 0.3-0.5 parts of silica fume by weight, the kaolin, limestone powder, and silica fume are placed in a ball mill and mixed for 20-30 minutes to obtain an inorganic gelling binder powder;

[0015] (2) taking 10-20 parts by weight of quartz sand, 15-26 parts of attapulgite, and 5-8 parts of basalt fiber, and mixing the quartz sand, attapulgite, and basalt fiber in a ball mill for 10-20 minutes to obtain a filler;

[0016] (3) placing dihydrogen phosphate, retarder, and nano-aluminum powder into an adjustable-speed mortar mixer, stirring and mixing at a speed of 30-50 r / min, adding water to make the composite viscous, stirring for 3-5 minutes, stopping stirring, adding inorganic gelling binder powder, rust-proof pigment, and curing agent, and stirring and mixing at a speed of 90-120 r / min to obtain a phosphate inorganic gelling binder;

[0017] (4) When the phosphate inorganic gelling binder is in a flowing slurry state, stir for 1-2 minutes, then add filler and stir at a speed of 55-90r / min for 3 minutes. During this period, add water to increase the fluidity of the inorganic coating until it meets the fluidity requirements of the on-site construction coating. Adjust the fluidity of the mixed slurry to 110-150mm to obtain a high-temperature and corrosion-resistant inorganic coating.

[0018] Application of the high temperature resistant and corrosion resistant inorganic coating in corrosion protection of metal material surfaces.

[0019] In summary, due to the adoption of the above technology, the beneficial effects of the present invention are:

[0020] The phosphate-based inorganic metal anti-corrosion coating provided by the present invention has strong interface bonding strength with the metal surface. After curing, the surface is flat and smooth, with high hardness, good wear resistance, and good salt spray resistance. Moreover, after thousands of wet cycles at high temperature, the surface is flat and smooth, without cracks or rust. The inorganic coating provided by the present invention has excellent anti-corrosion and high-temperature resistance. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention is not intended to limit the scope of the invention for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0022] Example 1

[0023] A high temperature resistant and corrosion resistant inorganic coating is composed of the following raw materials in parts by weight:

[0024]

[0025]

[0026] The anti-rust pigment is aluminum tripolyphosphate.

[0027] The retarder is borax.

[0028] The curing agent is pretreated over-burned magnesium oxide.

[0029] The preparation process of the pretreated overburned magnesium oxide is as follows: overburned magnesium oxide and silica sol are placed in a mixer at a mass ratio of 1:20, and stirred and mixed for 30 minutes at a speed of 400 r / min to obtain the pretreated overburned magnesium oxide.

[0030] The retarder is borax;

[0031] The preparation process of the high temperature resistant and corrosion resistant inorganic coating is as follows:

[0032] (1) Taking 0.5 parts of kaolin, 0.3 parts of limestone powder, and 0.5 parts of silica fume by weight, the kaolin, limestone powder, and silica fume are placed in a ball mill and mixed for 20 minutes to obtain an inorganic gelling binder powder;

[0033] (2) Taking 20 parts by weight of quartz sand, 26 parts of attapulgite, and 5 parts of basalt fiber, the quartz sand, attapulgite, and basalt fiber were placed in a ball mill and mixed for 20 minutes to obtain a filler;

[0034] (3) Putting dihydrogen phosphate, retarder and nano aluminum powder into an adjustable-speed mortar mixer and stirring at a speed of 30 r / min, adding water to make the composite body viscous, stirring for 5 minutes, stopping stirring, adding inorganic gelling binder powder, rust-proof pigment and curing agent, and stirring at a speed of 90 r / min to obtain a phosphate inorganic gelling binder;

[0035] (4) When the phosphate inorganic gelling binder is in a flowing slurry state, add filler after stirring for 2 minutes and stir at a speed of 55r / min for 3 minutes. During this period, water is added to increase the fluidity of the inorganic coating until it meets the fluidity requirements of the on-site construction coating. The fluidity of the mixed slurry is adjusted to 150mm to obtain a high-temperature and corrosion-resistant inorganic coating.

[0036] Application of the high temperature resistant and corrosion resistant inorganic coating in corrosion protection of metal material surfaces.

[0037] Example 2

[0038] A high temperature resistant and corrosion resistant inorganic coating is composed of the following raw materials in parts by weight:

[0039]

[0040] The anti-rust pigment is aluminum dihydrogen tripolyphosphate.

[0041] The retarder is boric acid.

[0042] The curing agent is pretreated over-burned magnesium oxide.

[0043] The preparation process of the pretreated overburned magnesium oxide is as follows: overburned magnesium oxide and silica sol are placed in a mixer at a mass ratio of 1:20, and stirred and mixed for 20 minutes at a speed of 600 r / min to obtain the pretreated overburned magnesium oxide.

[0044] The retarder is boric acid.

[0045] The preparation process of the high temperature resistant and corrosion resistant inorganic coating is as follows:

[0046] (1) Taking 0.5 parts of kaolin, 0.5 parts of limestone powder, and 0.5 parts of silica fume by weight, the kaolin, limestone powder, and silica fume are placed in a ball mill and mixed for 30 minutes to obtain an inorganic gelling binder powder;

[0047] (2) Taking 10 parts by weight of quartz sand, 15 parts of attapulgite, and 5 parts of basalt fiber, the quartz sand, attapulgite, and basalt fiber were placed in a ball mill and mixed for 10 minutes to obtain a filler;

[0048] (3) Putting dihydrogen phosphate, retarder and nano aluminum powder into an adjustable-speed mortar mixer and stirring at a speed of 30 r / min, adding water to make the composite body viscous, stirring for 3 minutes, stopping stirring, adding inorganic gelling binder powder, rust-proof pigment and curing agent, and stirring at a speed of 90 r / min to obtain a phosphate inorganic gelling binder;

[0049] (4) When the phosphate inorganic gelling binder is in a flowing slurry state, add filler after stirring for 2 minutes and stir at a speed of 90r / min for 3 minutes. During this period, water is added to increase the fluidity of the inorganic coating until it meets the fluidity requirements of the on-site construction coating. The fluidity of the mixed slurry is adjusted to 150mm to obtain a high-temperature and corrosion-resistant inorganic coating.

[0050] Application of the high temperature resistant and corrosion resistant inorganic coating in corrosion protection of metal material surfaces.

[0051] Example 3

[0052] A high temperature resistant and corrosion resistant inorganic coating is composed of the following raw materials in parts by weight:

[0053]

[0054] The anti-rust pigment is aluminum tripolyphosphate.

[0055] The retarder is borax.

[0056] The curing agent is pretreated over-burned magnesium oxide.

[0057] The preparation process of the pretreated overburned magnesium oxide is as follows: overburned magnesium oxide and silica sol are placed in a mixer at a mass ratio of 1:10, and stirred and mixed for 30 minutes at a speed of 600 r / min to obtain the pretreated overburned magnesium oxide.

[0058] The retarder is borax.

[0059] The preparation process of the high temperature resistant and corrosion resistant inorganic coating is as follows:

[0060] (1) Taking 0.3 parts of kaolin, 0.4 parts of limestone powder, and 0.5 parts of silica fume by weight, the kaolin, limestone powder, and silica fume are placed in a ball mill and mixed for 30 minutes to obtain an inorganic gelling binder powder;

[0061] (2) Taking 10 parts by weight of quartz sand, 26 parts of attapulgite, and 8 parts of basalt fiber, the quartz sand, attapulgite, and basalt fiber were placed in a ball mill and mixed for 20 minutes to obtain a filler;

[0062] (3) Putting dihydrogen phosphate, retarder and nano aluminum powder into an adjustable-speed mortar mixer and stirring at a speed of 30 r / min, adding water to make the composite body viscous, stirring for 3 minutes, stopping stirring, adding inorganic gelling binder powder, rust-proof pigment and curing agent, and stirring at a speed of 120 r / min to obtain a phosphate inorganic gelling binder;

[0063] (4) When the phosphate inorganic gelling binder is in a flowing slurry state, add filler after stirring for 2 minutes and stir at a speed of 90r / min for 3 minutes. During this period, water is added to increase the fluidity of the inorganic coating until it meets the fluidity requirements of the on-site construction coating. The fluidity of the mixed slurry is adjusted to 110 to obtain a high-temperature resistant and corrosion-resistant inorganic coating.

[0064] Application of the high temperature resistant and corrosion resistant inorganic coating in corrosion protection of metal material surfaces.

[0065] Comparative Example 1

[0066] A high temperature resistant and corrosion resistant inorganic coating is composed of the following raw materials in parts by weight:

[0067]

[0068] The anti-rust pigment is aluminum tripolyphosphate.

[0069] The retarder is borax.

[0070] The curing agent is overburned magnesium oxide.

[0071] The retarder is borax.

[0072] The preparation process of the high temperature resistant and corrosion resistant inorganic coating is as follows:

[0073] (1) Taking 0.3 parts of kaolin, 0.4 parts of limestone powder, and 0.5 parts of silica fume by weight, the kaolin, limestone powder, and silica fume are placed in a ball mill and mixed for 30 minutes to obtain an inorganic gelling binder powder;

[0074] (2) Taking 10 parts by weight of quartz sand, 26 parts of attapulgite, and 8 parts of basalt fiber, the quartz sand, attapulgite, and basalt fiber were placed in a ball mill and mixed for 20 minutes to obtain a filler;

[0075] (3) Putting dihydrogen phosphate, retarder and nano aluminum powder into an adjustable-speed mortar mixer and stirring at a speed of 30 r / min, adding water to make the composite body viscous, stirring for 3 minutes, stopping stirring, adding inorganic gelling binder powder, rust-proof pigment and curing agent, and stirring at a speed of 120 r / min to obtain a phosphate inorganic gelling binder;

[0076] (4) When the phosphate inorganic gelling binder is in a flowing slurry state, add filler after stirring for 2 minutes and stir at a speed of 90r / min for 3 minutes. During this period, water is added to increase the fluidity of the inorganic coating until it meets the fluidity requirements of the on-site construction coating. The fluidity of the mixed slurry is adjusted to 110 to obtain a high-temperature resistant and corrosion-resistant inorganic coating.

[0077] Application of the high temperature resistant and corrosion resistant inorganic coating in corrosion protection of metal material surfaces.

[0078] Comparative Example 2

[0079] A high temperature resistant and corrosion resistant inorganic coating is composed of the following raw materials in parts by weight:

[0080]

[0081] The anti-rust pigment is aluminum tripolyphosphate.

[0082] The retarder is borax.

[0083] The curing agent is pretreated over-burned magnesium oxide.

[0084] The preparation process of the pretreated overburned magnesium oxide is as follows: overburned magnesium oxide and silica sol are placed in a mixer at a mass ratio of 1:10, and stirred and mixed for 30 minutes at a speed of 600 r / min to obtain the pretreated overburned magnesium oxide.

[0085] The retarder is borax.

[0086] The preparation process of the high temperature resistant and corrosion resistant inorganic coating is as follows:

[0087] (1) Taking 0.3 parts of kaolin, 0.4 parts of limestone powder, and 0.5 parts of silica fume by weight, the kaolin, limestone powder, and silica fume are placed in a ball mill and mixed for 30 minutes to obtain an inorganic gelling binder powder;

[0088] (2) Taking 10 parts by weight of quartz sand, 26 parts of attapulgite, and 8 parts of basalt fiber, the quartz sand, attapulgite, and basalt fiber were placed in a ball mill and mixed for 20 minutes to obtain a filler;

[0089] (3) Put the dihydrogen phosphate and retarder into a mortar mixer with adjustable speed, stir and mix at a speed of 30 r / min, and add water to make the composite body viscous. After stirring for 3 minutes, stop stirring, add inorganic gelling binder powder, rust-proof pigment and curing agent, and stir and mix at a speed of 120 r / min to obtain a phosphate inorganic gelling binder;

[0090] (4) When the phosphate inorganic gelling binder is in a flowing slurry state, add filler after stirring for 2 minutes and stir at a speed of 90r / min for 3 minutes. During this period, water is added to increase the fluidity of the inorganic coating until it meets the fluidity requirements of the on-site construction coating. The fluidity of the mixed slurry is adjusted to 110 to obtain a high-temperature resistant and corrosion-resistant inorganic coating.

[0091] Application of the high temperature resistant and corrosion resistant inorganic coating in corrosion protection of metal material surfaces.

[0092] Testing: The samples of Examples 1-3 and Comparative Examples 1-2 after anti-corrosion treatment were subjected to performance tests according to GB-T9286-1998 Paint and Varnish Film Cross-cut Test, GB / T1768-2006 Paint and Varnish Determination of Resistance - Rotating Rubber Grinding Wheel Method, GB-1673-2006 Paint and Varnish Film Hardness Determination by Pencil Method, and ASTM B117-2011 Salt Spray Test Standard. The test results are listed in Table 1.

[0093] Table 1

[0094]

[0095] It can be seen from the data of Examples 1-3 and Comparative Examples 1-2 in Table 1 that the phosphate-based inorganic metal anti-corrosion coating provided by the present invention has a strong interface bonding strength with the metal surface, and the surface is flat and smooth after curing, with high hardness, good wear resistance, and good salt spray resistance. Moreover, after thousands of wet cycles at high temperature, the surface is flat and smooth, without cracks or rust. The high-temperature resistant and corrosion-resistant inorganic coating provided by the present invention has excellent corrosion resistance and high-temperature resistance.

[0096] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

[0097] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

Claims

1. A high temperature resistant and corrosion resistant inorganic coating, characterized in that: It is composed of the following raw materials in parts by weight:

2. The high temperature resistant and corrosion resistant inorganic coating according to claim 1, characterized in that: The anti-rust pigment is any one or more of aluminum tripolyphosphate and aluminum dihydrogen tripolyphosphate.

3. The high temperature resistant and corrosion resistant inorganic coating according to claim 1, characterized in that: The retarder is any one or more of borax and boric acid.

4. The high temperature resistant and corrosion resistant inorganic coating according to claim 1, characterized in that: The curing agent is pretreated over-burned magnesium oxide.

5. The high temperature resistant and corrosion resistant inorganic coating according to claim 1, characterized in that: The preparation process of the pretreated overburned magnesium oxide is as follows: overburned magnesium oxide and silica sol are placed in a mixer at a mass ratio of 1:10-1:20, and stirred and mixed for 20-30 minutes at a rotation speed of 400-600 r / min to obtain the pretreated overburned magnesium oxide.

6. The high temperature resistant and corrosion resistant inorganic coating according to claim 1, characterized in that: The retarder is any one or more of borax and boric acid.

7. The high temperature resistant and corrosion resistant inorganic coating according to claim 1, characterized in that: The preparation process of the high temperature resistant and corrosion resistant inorganic coating is as follows: (1) Taking 0.3-0.5 parts of kaolin, 0.3-0.5 parts of limestone powder, and 0.3-0.5 parts of silica fume by weight, the kaolin, limestone powder, and silica fume are placed in a ball mill and mixed for 20-30 minutes to obtain an inorganic gelling binder powder; (2) taking 10-20 parts by weight of quartz sand, 15-26 parts of attapulgite, and 5-8 parts of basalt fiber, and mixing the quartz sand, attapulgite, and basalt fiber in a ball mill for 10-20 minutes to obtain a filler; (3) placing dihydrogen phosphate, retarder, and nano-aluminum powder into an adjustable-speed mortar mixer, stirring and mixing at a speed of 30-50 r / min, adding water to make the composite viscous, stirring for 3-5 minutes, stopping stirring, adding inorganic gelling binder powder, rust-proof pigment, and curing agent, and stirring and mixing at a speed of 90-120 r / min to obtain a phosphate inorganic gelling binder; (4) When the phosphate inorganic gelling binder is in a flowing slurry state, stir for 1-2 minutes, then add filler and stir at a speed of 55-90r / min for 3 minutes. During this period, add water to increase the fluidity of the inorganic coating until it meets the fluidity requirements of the on-site construction coating. Adjust the fluidity of the mixed slurry to 110-150mm to obtain a high-temperature and corrosion-resistant inorganic coating.

8. The high temperature resistant and corrosion resistant inorganic coating according to claim 1, characterized in that: Application of the high temperature resistant and corrosion resistant inorganic coating in corrosion protection of metal material surfaces.

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