Color paste for water-based rust conversion coating and preparation method of color paste

Abstract

The invention relates to the technical field of color paste, in particular to color paste for a water-based rust conversion coating and a preparation method of the color paste, and the color paste comprises the following raw materials in parts by weight: 35-40 parts of a water-based organic pigment, 15-20 parts of a rust conversion synergist, 7-11 parts of a functional agent and 5-8 parts of a modified filler. According to the dual protection mechanism of the rust conversion synergist, zinc dihydrogen phosphate and tannic acid are compounded according to the proportion of 1: (0.5-1), meanwhile, raw materials such as a dispersing agent, an organic silicon defoaming agent and a coalescing agent are matched, and meanwhile, a modified filler is added for blending and coordinating; the modified filler adopts composite reinforcement of basalt fiber and silicon carbide, the preheated basalt fiber and silicon carbide are dispersed in a sodium dodecyl benzene sulfonate solution, the poor anti-rust performance of the coating is improved, and meanwhile the coloring strength of the product is poor.

Description

Technical Field

[0001] This invention relates to the field of color paste technology, specifically to a color paste for water-based rust conversion coatings and its preparation method. Background Technology

[0002] Corrosion has a significant impact on metal products in daily life. To protect steel from corrosion, anti-corrosion coating has become the most economical and effective method. Modern large buildings mostly use steel structures, making surface treatment of the steel before coating a necessary means to ensure the anti-corrosion effect of the coating. However, existing color paste products have poor rust-preventive properties, poor color strength, and poor overall coordination, limiting their efficiency. Therefore, this invention provides a water-based rust-converting coating color paste and its preparation method. Summary of the Invention

[0003] In view of the deficiencies of the prior art, the purpose of this invention is to provide a color paste for water-based rust conversion coatings and its preparation method, so as to solve the problems mentioned in the background art.

[0004] The present invention solves the technical problem by adopting the following technical solution: This invention provides a color paste for water-based rust conversion coatings, the color paste comprising the following raw materials in parts by weight: 35-40 parts water-based organic pigment, 15-20 parts rust conversion synergist, 7-11 parts functional agent, and 5-8 parts modified filler. The functional agent includes 4 to 7 parts of dispersant, 2 to 5 parts of defoamer, and 1 to 3 parts of film-forming aid.

[0005] Preferably, the rust conversion synergist is a compound of zinc dihydrogen phosphate and tannic acid, with a mass ratio of 1:(0.5-1); the dispersant is sodium hexametaphosphate; the defoamer is an organosilicon defoamer; the film-forming agent is propylene glycol methyl ether acetate; and the water-based organic pigment is phthalocyanine blue.

[0006] Preferably, the modified filler is prepared by: S01: Basalt fiber is preheated at 55-60℃ for 1 hour to obtain preheated basalt fiber. 3-5 parts of preheated basalt fiber, 2-4 parts of silicon carbide, 5-8 parts of sodium dodecylbenzenesulfonate solution and 1-2 parts of silane coupling agent KH560 are blended to obtain basalt fiber liquid. S02: Modified nanocellulose and basalt fiber liquid were ball-milled at a weight ratio of (7-11):5, with a ball milling speed of 1000-1500 r / min for 2 hours. After ball milling, the mixture was filtered and dried to obtain the modified filler.

[0007] Preferably, the sodium dodecylbenzenesulfonate solution has a mass fraction of 10-15%; the blending speed for the blending treatment is 350-400 r / min, and the blending time is 2 h.

[0008] Preferably, the specific modification method of the modified nanocellulose is as follows: S02a: Mix 5-8 parts of kaolin, 3-5 parts of calcium sulfate whiskers and 2-4 parts of nano zeolite powder thoroughly, and then heat treat at 135-145℃ for 5-10 minutes. After the treatment is completed, the modifier is obtained. S02b: Mix nanocellulose with sodium alginate solution in a volume of 3-5 times the total amount of nanocellulose, then add 10-15% modifier to the nanocellulose, ball mill, filter and dry to obtain modified nanocellulose.

[0009] Preferably, the sodium alginate solution has a mass fraction of 5-8%.

[0010] Preferably, the ball milling process is performed at a speed of 1050-1250 r / min for 2 hours.

[0011] The present invention also provides a method for preparing a color paste for water-based rust conversion coatings, comprising the following steps: weighing raw materials according to the weight parts, mixing the raw materials evenly, and thus obtaining the color paste for water-based rust conversion coatings of the present invention.

[0012] Preferably, the mixing speed for uniform mixing of raw materials is 750-850 r / min, and the mixing time is 2 h.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The dual protection mechanism of the rust conversion synergist of this invention employs a compound of zinc dihydrogen phosphate and tannic acid in a ratio of 1:0.5-1, along with dispersants, organosilicon defoamers, film-forming aids, and other raw materials. Modified fillers are also added for blending and coordination. The modified fillers are composite reinforcements of basalt fiber and silicon carbide. Preheated basalt fiber and silicon carbide are dispersed in sodium dodecylbenzene sulfonate solution, forming chemical bonds through the bridging effect of silane coupling agent KH560. The adsorption and synergistic effect of nanocellulose: After modification with kaolin, calcium sulfate whiskers, and nano-zeolite powder, the specific surface area of ​​nanocellulose increases. Modified nanocellulose and basalt fiber liquid are ball-milled to form a three-dimensional network structure, which not only enhances the interfacial bonding force between the filler and resin but also adsorbs free water in the coating, further improving water resistance. The synergistic modifier of heat treatment and surface modification is heat-treated at 135-145℃ for 5-10 minutes. Within minutes, the crystal structure of kaolin and calcium sulfate whiskers is activated, enhancing their hydrogen bonding with nanocellulose. The encapsulation with sodium alginate solution further improves the dispersibility of nanocellulose, ensuring its uniform distribution in the coating system and enhancing overall mechanical properties. Detailed Implementation

[0014] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to specific examples. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] This embodiment provides a color paste for a water-based rust conversion coating, the color paste comprising the following raw materials in parts by weight: 35-40 parts water-based organic pigment, 15-20 parts rust conversion synergist, 7-11 parts functional agent, and 5-8 parts modified filler. The functional agent includes 4 to 7 parts of dispersant, 2 to 5 parts of defoamer, and 1 to 3 parts of film-forming aid.

[0016] In this embodiment, the rust conversion synergist is a compound of zinc dihydrogen phosphate and tannic acid, with a mass ratio of 1:(0.5-1); the dispersant is sodium hexametaphosphate; the defoamer is an organosilicon defoamer; the film-forming agent is propylene glycol methyl ether acetate; and the water-based organic pigment is phthalocyanine blue.

[0017] The preparation method of the modified filler in this embodiment is as follows: S01: Basalt fiber is preheated at 55-60℃ for 1 hour to obtain preheated basalt fiber. 3-5 parts of preheated basalt fiber, 2-4 parts of silicon carbide, 5-8 parts of sodium dodecylbenzenesulfonate solution and 1-2 parts of silane coupling agent KH560 are blended to obtain basalt fiber liquid. S02: Modified nanocellulose and basalt fiber liquid were ball-milled at a weight ratio of (7-11):5, with a ball milling speed of 1000-1500 r / min for 2 hours. After ball milling, the mixture was filtered and dried to obtain the modified filler.

[0018] In this embodiment, the sodium dodecylbenzenesulfonate solution has a mass fraction of 10-15%; the blending speed for the blending treatment is 350-400 r / min, and the blending time is 2 h.

[0019] The specific modification method of the modified nanocellulose in this embodiment is as follows: S02a: Mix 5-8 parts of kaolin, 3-5 parts of calcium sulfate whiskers and 2-4 parts of nano zeolite powder thoroughly, and then heat treat at 135-145℃ for 5-10 minutes. After the treatment is completed, the modifier is obtained. S02b: Mix nanocellulose with sodium alginate solution in a volume of 3-5 times the total amount of nanocellulose, then add 10-15% modifier to the nanocellulose, ball mill, filter and dry to obtain modified nanocellulose.

[0020] The sodium alginate solution in this embodiment has a mass fraction of 5-8%.

[0021] In this embodiment, the ball milling process is carried out at a speed of 1050-1250 r / min for 2 hours.

[0022] The preparation method of the color paste for water-based rust conversion coating of this embodiment includes the following steps: weighing the raw materials according to the weight parts, mixing the raw materials evenly, and then obtaining the color paste for water-based rust conversion coating of this invention.

[0023] In this embodiment, the raw materials are mixed evenly at a speed of 750-850 r / min for 2 hours.

[0024] Example 1. This embodiment provides a color paste for a water-based rust-converting coating, the color paste comprising the following raw materials in parts by weight: 35 parts water-based organic pigment, 15 parts rust-converting synergist, 7 parts functional agent, and 5 parts modified filler. The functional agent comprises 4 parts dispersant, 2 parts defoamer, and 1 part film-forming aid.

[0025] In this embodiment, the rust conversion synergist is a compound of zinc dihydrogen phosphate and tannic acid in a mass ratio of 1:0.5; the dispersant is sodium hexametaphosphate; the defoamer is an organosilicon defoamer; the film-forming agent is propylene glycol methyl ether acetate; and the water-based organic pigment is phthalocyanine blue.

[0026] The preparation method of the modified filler in this embodiment is as follows: S01: Basalt fiber is preheated at 55℃ for 1 hour to obtain preheated basalt fiber. 3 parts of preheated basalt fiber, 2 parts of silicon carbide, 5 parts of sodium dodecylbenzenesulfonate solution and 1 part of silane coupling agent KH560 are blended to obtain basalt fiber liquid. S02: Modified nanocellulose and basalt fiber liquid were ball-milled at a weight ratio of 7:5 at a speed of 1000 r / min for 2 hours. After ball milling, the mixture was filtered and dried to obtain the modified filler.

[0027] In this embodiment, the sodium dodecylbenzenesulfonate solution has a mass fraction of 10%; the blending speed for the blending treatment is 350 r / min, and the blending time is 2 h.

[0028] The specific modification method of the modified nanocellulose in this embodiment is as follows: S02a: Mix 5 parts kaolin, 3 parts calcium sulfate whiskers and 2 parts nano zeolite powder thoroughly, then heat treat at 135℃ for 5 minutes. After the treatment is completed, the modifier is obtained. S02b: The nanocellulose is stirred evenly in a sodium alginate solution with a volume of 3 times the total amount of nanocellulose. Then, a modifier of 10% of the total amount of nanocellulose is added to the nanocellulose. The mixture is ball-milled, filtered, and dried to obtain modified nanocellulose.

[0029] The sodium alginate solution in this embodiment has a mass fraction of 5%.

[0030] In this embodiment, the ball milling process is performed at a speed of 1050 r / min for 2 hours.

[0031] The preparation method of the color paste for water-based rust conversion coating of this embodiment includes the following steps: weighing the raw materials according to the weight parts, mixing the raw materials evenly, and then obtaining the color paste for water-based rust conversion coating of this invention.

[0032] In this embodiment, the raw materials are mixed evenly at a speed of 750 r / min for 2 hours.

[0033] Example 2. This embodiment provides a color paste for a water-based rust-converting coating, the color paste comprising the following raw materials in parts by weight: 40 parts water-based organic pigment, 20 parts rust-converting synergist, 11 parts functional agent, and 8 parts modified filler. The functional agent comprises 7 parts dispersant, 5 parts defoamer, and 3 parts film-forming aid.

[0034] In this embodiment, the rust conversion synergist is a compound of zinc dihydrogen phosphate and tannic acid in a mass ratio of 1:1; the dispersant is sodium hexametaphosphate; the defoamer is an organosilicon defoamer; the film-forming agent is propylene glycol methyl ether acetate; and the water-based organic pigment is phthalocyanine blue.

[0035] The preparation method of the modified filler in this embodiment is as follows: S01: Basalt fiber is preheated at 60℃ for 1 hour to obtain preheated basalt fiber. 5 parts of preheated basalt fiber, 4 parts of silicon carbide, 8 parts of sodium dodecylbenzenesulfonate solution and 2 parts of silane coupling agent KH560 are blended to obtain basalt fiber liquid. S02: Modified nanocellulose and basalt fiber liquid were ball-milled at a weight ratio of 11:5 at a speed of 1500 r / min for 2 hours. After ball milling, the mixture was filtered and dried to obtain the modified filler.

[0036] In this embodiment, the sodium dodecylbenzenesulfonate solution has a mass fraction of 15%; the blending speed for the blending treatment is 400 r / min, and the blending time is 2 h.

[0037] The specific modification method of the modified nanocellulose in this embodiment is as follows: S02a: Mix 8 parts of kaolin, 5 parts of calcium sulfate whiskers and 4 parts of nano zeolite powder thoroughly, and then heat treat at 145℃ for 10 min. After the treatment is completed, the modifier is obtained. S02b: The nanocellulose is stirred evenly in a sodium alginate solution with a volume of 5 times that of the total nanocellulose. Then, a modifier of 15% of the total nanocellulose volume is added to the nanocellulose. The mixture is ball-milled, filtered, and dried to obtain modified nanocellulose.

[0038] The sodium alginate solution in this embodiment has a mass fraction of 8%.

[0039] In this embodiment, the ball milling process is performed at a speed of 1250 r / min for 2 hours.

[0040] The preparation method of the color paste for water-based rust conversion coating of this embodiment includes the following steps: weighing the raw materials according to the weight parts, mixing the raw materials evenly, and then obtaining the color paste for water-based rust conversion coating of this invention.

[0041] In this embodiment, the raw materials are mixed evenly at a speed of 850 r / min for 2 hours.

[0042] Example 3. This embodiment provides a color paste for a water-based rust conversion coating, the color paste comprising the following raw materials in parts by weight: 37.5 parts water-based organic pigment, 17.5 parts rust conversion synergist, 9 parts functional agent, and 6.5 parts modified filler. The functional agent comprises 5.5 parts dispersant, 3.5 parts defoamer, and 2 parts film-forming aid.

[0043] In this embodiment, the rust conversion synergist is a compound of zinc dihydrogen phosphate and tannic acid in a mass ratio of 1:0.75; the dispersant is sodium hexametaphosphate; the defoamer is an organosilicon defoamer; the film-forming agent is propylene glycol methyl ether acetate; and the water-based organic pigment is phthalocyanine blue.

[0044] The preparation method of the modified filler in this embodiment is as follows: S01: Basalt fiber is preheated at 58℃ for 1 hour to obtain preheated basalt fiber. 4 parts of preheated basalt fiber, 3 parts of silicon carbide, 6.5 parts of sodium dodecylbenzenesulfonate solution and 1.5 parts of silane coupling agent KH560 are blended to obtain basalt fiber liquid. S02: Modified nanocellulose and basalt fiber liquid were ball-milled at a weight ratio of 9:5 at a speed of 1250 r / min for 2 hours. After ball milling, the mixture was filtered and dried to obtain the modified filler.

[0045] In this embodiment, the sodium dodecylbenzenesulfonate solution had a mass fraction of 12.5%; the blending speed for the blending treatment was 370 r / min, and the blending time was 2 h.

[0046] The specific modification method of the modified nanocellulose in this embodiment is as follows: S02a: 6.5 parts of kaolin, 4 parts of calcium sulfate whiskers and 3 parts of nano zeolite powder are mixed thoroughly and then heat-treated at 140℃ for 7.5 min. After the treatment is completed, the modifier is obtained. S02b: The nanocellulose was stirred evenly in a sodium alginate solution with a volume of 4 times the total amount of nanocellulose. Then, a modifier of 12.5% ​​of the total amount of nanocellulose was added to the nanocellulose. The mixture was ball-milled, filtered, and dried to obtain modified nanocellulose.

[0047] The sodium alginate solution in this embodiment has a mass fraction of 6.5%.

[0048] In this embodiment, the ball milling process is performed at a speed of 1100 r / min for 2 hours.

[0049] The preparation method of the color paste for water-based rust conversion coating of this embodiment includes the following steps: weighing the raw materials according to the weight parts, mixing the raw materials evenly, and then obtaining the color paste for water-based rust conversion coating of this invention.

[0050] In this embodiment, the raw materials are mixed evenly at a speed of 800 r / min for 2 hours.

[0051] Example 4. This embodiment provides a color paste for a water-based rust-converting coating, the color paste comprising the following raw materials in parts by weight: 36 parts water-based organic pigment, 16 parts rust-converting synergist, 8 parts functional agent, and 6 parts modified filler. The functional agent comprises 5 parts dispersant, 3 parts defoamer, and 2 parts film-forming aid.

[0052] In this embodiment, the rust conversion synergist is a compound of zinc dihydrogen phosphate and tannic acid in a mass ratio of 1:0.6; the dispersant is sodium hexametaphosphate; the defoamer is an organosilicon defoamer; the film-forming agent is propylene glycol methyl ether acetate; and the water-based organic pigment is phthalocyanine blue.

[0053] The preparation method of the modified filler in this embodiment is as follows: S01: Basalt fiber is preheated at 56℃ for 1 hour to obtain preheated basalt fiber. 3 parts of preheated basalt fiber, 3 parts of silicon carbide, 6 parts of sodium dodecylbenzenesulfonate solution and 1 part of silane coupling agent KH560 are blended to obtain basalt fiber liquid. S02: Modified nanocellulose and basalt fiber liquid were ball-milled at a weight ratio of 75, with a ball milling speed of 1100 r / min for 2 h. After ball milling, the mixture was filtered and dried to obtain the modified filler.

[0054] In this embodiment, the sodium dodecylbenzenesulfonate solution has a mass fraction of 12%; the blending speed for the blending treatment is 360 r / min, and the blending time is 2 h.

[0055] The specific modification method of the modified nanocellulose in this embodiment is as follows: S02a: Mix 6 parts kaolin, 4 parts calcium sulfate whiskers and 3 parts nano zeolite powder thoroughly, then heat treat at 138℃ for 6 minutes. After the treatment is completed, the modifier is obtained. S02b: The nanocellulose was stirred evenly in a sodium alginate solution with a volume of 4 times the total amount of nanocellulose. Then, a modifier of 12% of the total amount of nanocellulose was added to the nanocellulose. The mixture was ball-milled, filtered, and dried to obtain modified nanocellulose.

[0056] The sodium alginate solution in this embodiment has a mass fraction of 6%.

[0057] In this embodiment, the ball milling process is performed at a speed of 1100 r / min for 2 hours.

[0058] The preparation method of the color paste for water-based rust conversion coating of this embodiment includes the following steps: weighing the raw materials according to the weight parts, mixing the raw materials evenly, and then obtaining the color paste for water-based rust conversion coating of this invention.

[0059] In this embodiment, the raw materials are mixed evenly at a speed of 760 r / min for 2 hours.

[0060] Comparative Example 1. Unlike Example 3, no modified filler was added.

[0061] Comparative Example 2. Unlike Example 3, no modified nanocellulose was added to the modified filler.

[0062] Comparative Example 3. Unlike Example 3, no modifier was added to the modified nanocellulose.

[0063] Comparative Example 4. Unlike Example 3, no kaolin or calcium sulfate whiskers were added to the modifier.

[0064] The product performance tests of Examples 1-4 and Comparative Examples 1-4 were conducted, and the test results are as follows:

[0065] From Examples 1-4 and Comparative Examples 1-4, it can be seen that the product of the present invention can achieve coordinated improvement in rust prevention, flexibility and color strength. In the product, the performance tends to deteriorate when no modified filler is added, no modified nanocellulose is added to the modified filler, no modifier is added to the modified nanocellulose, and no kaolin or calcium sulfate whiskers are added to the modifier. Only the product raw materials obtained by the method of the present invention have the most significant performance effect.

[0066] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0067] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A color paste for water-based rust-converting coatings, characterized in that, The color paste comprises the following raw materials in parts by weight: 35-40 parts of water-based organic pigment, 15-20 parts of rust conversion synergist, 7-11 parts of functional agent, and 5-8 parts of modified filler. The functional agent includes 4 to 7 parts of dispersant, 2 to 5 parts of defoamer, and 1 to 3 parts of film-forming aid.

2. The color paste for water-based rust-converting coatings according to claim 1, characterized in that, The rust conversion synergist is a compound of zinc dihydrogen phosphate and tannic acid, with a mass ratio of 1:(0.5-1); the dispersant is sodium hexametaphosphate; the defoamer is an organosilicon defoamer; the film-forming agent is propylene glycol methyl ether acetate; and the water-based organic pigment is phthalocyanine blue.

3. The color paste for water-based rust-converting coatings according to claim 1, characterized in that, The preparation method of the modified filler is as follows: S01: Basalt fiber is preheated at 55-60℃ for 1 hour to obtain preheated basalt fiber. 3-5 parts of preheated basalt fiber, 2-4 parts of silicon carbide, 5-8 parts of sodium dodecylbenzenesulfonate solution and 1-2 parts of silane coupling agent KH560 are blended to obtain basalt fiber liquid. S02: Modified nanocellulose and basalt fiber liquid were ball-milled at a weight ratio of (7-11):5, with a ball milling speed of 1000-1500 r / min for 2 hours. After ball milling, the mixture was filtered and dried to obtain the modified filler.

4. The color paste for water-based rust-converting coatings according to claim 3, characterized in that, The sodium dodecylbenzenesulfonate solution has a mass fraction of 10-15%; the blending speed for the blending treatment is 350-400 r / min, and the blending time is 2 h.

5. The color paste for water-based rust-converting coatings according to claim 3, characterized in that, The specific modification method for the modified nanocellulose is as follows: S02a: Mix 5-8 parts of kaolin, 3-5 parts of calcium sulfate whiskers and 2-4 parts of nano zeolite powder thoroughly, and then heat treat at 135-145℃ for 5-10 minutes. After the treatment is completed, the modifier is obtained. S02b: Mix nanocellulose with sodium alginate solution in a volume of 3-5 times the total amount of nanocellulose, then add 10-15% modifier to the nanocellulose, ball mill, filter and dry to obtain modified nanocellulose.

6. The color paste for water-based rust-converting coatings according to claim 5, characterized in that, The sodium alginate solution has a mass fraction of 5-8%.

7. The color paste for water-based rust-converting coatings according to claim 5, characterized in that, The ball milling process is carried out at a speed of 1050-1250 r / min for 2 hours.

8. A method for preparing a color paste for water-based rust-converting coatings as described in any one of claims 1-7, characterized in that, The process includes the following steps: weighing the raw materials according to the specified weight proportions, mixing the raw materials evenly, and obtaining the color paste for the water-based rust conversion coating of the present invention.

9. The method for preparing a color paste for water-based rust-converting coatings as described in claim 8, characterized in that, The mixing speed for uniform mixing of raw materials is 750-850 r / min, and the mixing time is 2 h.

Images