CN112724828A - Preparation method of temporary antirust liquid for color-coated sheet - Google Patents
Preparation method of temporary antirust liquid for color-coated sheet Download PDFInfo
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
- C09D183/08—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen, and oxygen
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- C08G77/04—Polysiloxanes
- C08G77/22—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
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Abstract
The invention relates to the field of color-coated sheets, and particularly discloses a preparation method of a temporary antirust liquid for a color-coated sheet. The temporary antirust liquid is prepared from the following raw materials: 30-60 parts of water-based organic silicon emulsion, 0.5-5 parts of cerium salt, 5-30 parts of silicate, 0.5-5 parts of benzoate, 0.5-4 parts of ethylene diamine tetraacetic acid salt and 30-70 parts of deionized water, wherein the water-based organic silicon emulsion is obtained by crosslinking three types of silane coupling agents containing epoxy groups, long-chain alkyl groups and amino groups. The temporary antirust liquid has the corrosion resistance of a chemical conversion layer in a conventional process and excellent bonding force with finish paint, can replace two processes of the chemical conversion layer and a primer layer in the conventional process by using the one process, saves cost, improves the production efficiency of a color-coated plate, and has a certain self-repairing capability when the temporary antirust liquid acts on a cold-rolled steel plate to form a conversion film.
Description
Technical Field
The invention relates to the field of color-coated sheets, in particular to a preparation method of a temporary antirust liquid for a color-coated sheet.
Background
The base materials used by the common color-coated sheet include cold-rolled steel sheets, hot-dip galvanized sheets, electro-galvanized sheets, aluminum-plated zinc sheets and the like, and the surface of the base material is sequentially coated with a chemical conversion layer, a primer layer and a finish paint layer (finish paint), wherein the chemical conversion layer mainly serves to provide temporary corrosion resistance for the base material before the base material is painted, and the primer layer mainly serves to improve the binding force between the base material and the finish paint layer. In the production process, the chemical conversion layer and the base coat are coated on the substrate by two procedures, so the production cost is higher and the production time is longer. The color-coated sheet using the cold-rolled steel sheet as the base material is relatively cheap, but the cold-rolled steel sheet is exposed to air to be corroded after the paint on the surface is scratched in the using process, so that the using range of the color-coated sheet using the cold-rolled steel sheet as the base material is limited.
In order to further reduce the cost of the color-coated plate and simplify the construction process, a temporary antirust solution needs to be developed, wherein the film layer on the substrate has the corrosion resistance of the conversion coating, the adhesion and the coating processability of the primer layer, so that the traditional two procedures of a chemical conversion coating and the primer layer are replaced. If the existing antirust liquid is simply mixed with the primer for use, the mixed liquid has poor stability, and the mixed liquid has the phenomenon of particles and even gel and cannot be used; and the common primer is oil-soluble organic resin, such as epoxy resin, polyurethane and the like, which is difficult to dissolve in the aqueous antirust liquid, even if the aqueous resin is used as the primer, the organic film layer and the antirust liquid are difficult to act synergistically even if the aqueous resin is simply dissolved in the antirust liquid, and the corrosion resistance of the antirust liquid can be damaged.
In the patent application CN106283005A, a water-based rust-proof liquid is disclosed, which has a certain corrosion resistance, uses dimethyl undecanedioate as an organic film layer, has a certain adhesion with the paint, but is easy to crack when coated sheet is processed because of the poor flexibility of the film layer.
The CN110408312A patent application discloses a temporary antirust liquid and a preparation method thereof, wherein the antirust agent has good corrosion resistance and adhesiveness, but the antirust liquid uses water-based sol as an adhesive, and the water-based sol is very easy to wash away by water and can not be used as a base coat.
The patent application CN106191842A discloses a water-based antirust liquid with good adhesion to paint, wherein an acrylic emulsion is used as an organic film-forming material, and the organic film-forming material has the defects of hot adhesion and cold brittleness, and is difficult to use as a base coat.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a preparation method of a temporary antirust liquid for a color-coated plate.
The technical scheme of the invention is as follows:
a preparation method of a temporary antirust liquid for a color-coated sheet is disclosed, wherein the temporary antirust liquid is prepared from the following raw materials: 30-60 parts of water-based organic silicon emulsion, 0.5-5 parts of cerium salt, 5-30 parts of silicate, 0.5-5 parts of benzoate, 0.5-4 parts of ethylene diamine tetraacetic acid salt and 30-70 parts of deionized water;
preferably, the temporary antirust liquid is prepared from the following raw materials: 35-55 parts of water-based organic silicon emulsion, 1-3 parts of cerium salt, 10-15 parts of silicate, 0.5-2 parts of benzoate, 0.5-2 parts of ethylene diamine tetraacetic acid salt and 40-60 parts of deionized water;
further, the cerium salt is one or more of cerium nitrate, cerium acetate, cerium sulfate and cerium phosphate;
further, the silicate is one or more of sodium silicate, potassium silicate and magnesium silicate;
further, the benzoate is one or more of sodium benzoate, potassium benzoate and ammonium benzoate;
further, the edetate is one or more of potassium edetate, sodium edetate and ammonium edetate;
further, the preparation method of the temporary antirust liquid comprises the following steps:
step A: preparation of aqueous silicone emulsion:
step 1, mixing and stirring uniformly 20-40 parts by mass of an epoxy-containing silane coupling agent, 2-8 parts by mass of a long-chain alkyl-containing silane coupling agent and 10-20 parts by mass of an amino-containing silane coupling agent to obtain a mixture;
step 2, adding 60-100 parts by mass of deionized water and 0.5-20 parts by mass of an acid catalyst into a reactor, heating to 40-60 ℃, dropwise adding the mixture obtained in the step 1 into the reactor in a stirring state for 2-5 hours, and after dropwise adding, carrying out heat preservation reaction for 1-3 hours to obtain a water-based organic silicon emulsion;
further, the structure of the silane coupling agent containing the epoxy group is R0-Si(OR1)3Wherein R is0Is gamma- (2, 3-epoxypropoxy) propyl, R1Is methyl, ethyl, propyl or isopropyl;
further, the structure of the silane coupling agent containing long-chain alkyl is R2-Si(OR1)3Wherein R is2Is alkyl with 6-20 carbon atoms in the main chain, R1Is methyl, ethyl, propyl or isopropyl;
further, the structure of the silane coupling agent containing amino is R3-Si(OR1)3Wherein R is3Is gamma-aminopropyl, N-beta (aminoethyl) -gamma-aminopropyl or anilinomethyl, R1Is methyl, ethyl, propyl or isopropyl;
preferably, the silane coupling agent containing epoxy groups is gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane and/or gamma- (2, 3-epoxypropoxy) propyl triethoxy silane;
preferably, the silane coupling agent containing long-chain alkyl is one or more of n-hexyltrimethoxysilane, n-hexyltriethoxysilane, dodecyltrimethoxysilane, dodecyltriethoxysilane, octadecyltrimethoxysilane and octadecyltriethoxysilane;
preferably, the amino-containing silane coupling agent is one or more of gamma-aminopropyltrimethoxysilane, gamma-aminopropyltriethoxysilane, N-beta (aminoethyl) -gamma-aminopropyltrimethoxysilane, N-beta (aminoethyl) -gamma-aminopropyltriethoxysilane, anilinomethyltrimethoxysilane and anilinomethyltriethoxysilane;
further, the acid catalyst is one or more of glacial acetic acid, oxalic acid, 85wt% of phosphoric acid and 68wt% of nitric acid;
the preparation method of the temporary antirust liquid further comprises the following step B:
and B: preparing a temporary antirust liquid for a color-coated sheet: adding cerium salt, silicate, benzoate and ethylenediamine tetraacetate into deionized water, stirring and dissolving, then dropwise adding the dissolved mixture into the water-based organic silicon emulsion in a stirring state, and uniformly mixing to obtain the organic silicon emulsion.
When the temporary antirust liquid is specifically applied to the color-coated sheet, the temporary antirust liquid can be applied to the surfaces of base materials such as cold-rolled steel sheets, hot-dip galvanized sheets, electro-galvanized sheets, aluminum-galvanized sheets and the like, and can adopt coating modes such as roller coating, blade coating, dip coating and the like; the coating film thickness is controlled to be 1200 mg/square meter to 3000 mg/square meter, when the coating film is used for cold-rolled steel plates, the coating film thickness is preferably 1500 mg/square meter to 3000 mg/square meter, and more preferably 1500 mg/square meter to 1800 mg/square meter; and after coating, baking for 1-5 min when the temperature of the plate reaches 80-120 ℃.
After the temporary antirust liquid obtained by the preparation method is coated on the surface of a cold-rolled steel sheet base material and dried, an organic-inorganic composite film can be formed on the surface of the cold-rolled steel sheet base material, wherein the organic part is an organic silicon film, epoxy groups in the organic silicon film can improve the bonding force between the organic film and the metal surface, the crosslinking degree of the organic film can be improved by using aminosilane, and meanwhile, silane hydrolysate forms ammonium salt in an acid system to improve the stability of the aqueous organic silicon emulsion; the use of the long-chain alkyl silane can improve the flexibility of the organic film, so that the organic film is not cracked in the use process, in the long-chain alkyl silane, a long carbon chain segment endows the organic film with certain hydrophobicity, and meanwhile, the bonding force with common organic coatings is excellent, the long-chain silane cannot play the role when the long-chain silane is used too little, the stability of the organic silicon emulsion can be reduced when the long-chain silane is used too much, the long-chain alkyl silane is preferably used in an amount which is one tenth to one half of the epoxy silane, the organic film has good adhesion to the metal surface and outer layer coatings, and simultaneously has a certain barrier effect on air, so that the corrosion resistance of the film is improved; in a corrosion resistance experiment, XRF is used for detecting components in a scratched wear area of an organic-inorganic composite film of a cold-rolled sheet treated by the temporary antirust liquid, so that the existence of cerium element can be detected.
Compared with the prior art, the invention has the advantages and beneficial effects that:
the temporary antirust liquid has the corrosion resistance of a chemical conversion layer in a conventional process and excellent bonding force with finish paint, can replace two processes of the chemical conversion layer and a primer layer in the conventional process by using one process, saves cost and improves the production efficiency of a color-coated plate, and when the temporary antirust liquid acts on the surface of a cold-rolled steel plate, a formed conversion film has certain self-repairing capability.
Drawings
Fig. 1 is a morphology chart of a sample plate subjected to plate check and 9J reverse impact tests after the temporary antirust liquid prepared in examples 1 to 5 and 7 of the invention is treated and subjected to powder spraying.
Detailed Description
The present invention is further described in detail with reference to the following examples, which are intended to facilitate the understanding of the present invention by those skilled in the art, but are not intended to limit the present invention.
Example 1 preparation method of temporary antirust liquid for color-coated sheet
In the embodiment, each mass part is 100 g;
the first step is as follows: the preparation method of the water-based organic silicon emulsion comprises the following steps:
step 1, mixing and stirring uniformly 20 parts by mass of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, 2 parts by mass of dodecyl trimethoxy silane and 10 parts by mass of gamma-aminopropyl trimethoxy silane to obtain a mixture;
step 2, adding 80 parts by mass of deionized water and 12 parts by mass of phosphoric acid with the mass concentration of 85% into a reactor, heating to 55 ℃, completely dropwise adding the mixture obtained in the step 1 into the reactor in a stirring state for 2 hours, and after dropwise adding, carrying out heat preservation reaction for 2 hours to obtain 124 parts by mass of water-based organic silicon emulsion;
the second step is that: preparing a temporary antirust liquid for a color-coated sheet:
at normal temperature, 1 part by mass of cerium nitrate, 10 parts by mass of sodium silicate, 1 part by mass of sodium benzoate and 1.5 parts by mass of potassium ethylenediaminetetraacetate are added into 50 parts by mass of deionized water and stirred to be dissolved, then the dissolved mixed liquid is dripped into 35 parts by mass of the aqueous organosilicon emulsion prepared in the first step in the stirring state, the dripping time is 15 minutes, and the mixture is stirred for 10 minutes after the dripping is completed, so that the temporary antirust liquid for the color-coated plate is obtained.
Embodiment 2 preparation method of temporary antirust liquid for color-coated sheet
In the embodiment, each part by mass is 500 g;
the first step is as follows: the preparation method of the water-based organic silicon emulsion comprises the following steps:
step 1, mixing and stirring uniformly 20 parts by mass of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, 3 parts by mass of octadecyl trimethoxy silane and 15 parts by mass of gamma-aminopropyl triethoxy silane to obtain a mixture;
step 2, adding 80 parts by mass of deionized water and 3.8 parts by mass of nitric acid with the mass concentration of 68% into a reactor, heating to 50 ℃, dropwise adding the mixture obtained in the step 1 into the reactor in a stirring state for 2 hours, and after dropwise adding, carrying out heat preservation reaction for 2 hours to obtain 128 parts by mass of water-based organic silicon emulsion;
the second step is that: preparing a temporary antirust liquid for a color-coated sheet:
at normal temperature, 1.5 parts by mass of cerium acetate, 12 parts by mass of sodium silicate, 0.8 part by mass of ammonium benzoate and 1.8 parts by mass of sodium ethylene diamine tetracetate are added into 55 parts by mass of deionized water and stirred to be dissolved, then the dissolved mixture is dripped into 40 parts by mass of the aqueous organosilicon emulsion prepared in the first step of the embodiment in a stirring state, the dripping time is 20 minutes, and stirring is carried out for 5 minutes after the dripping is finished, so as to obtain the temporary antirust liquid for the color-coated plate.
Example 3 preparation method of temporary antirust liquid for color-coated sheet
In the embodiment, each part by mass is 1 kg;
the first step is as follows: the preparation method of the water-based organic silicon emulsion comprises the following steps:
step 1, taking 35 parts by mass of gamma- (2, 3-epoxypropoxy) propyl triethoxysilane, 4 parts by mass of N-hexyl triethoxysilane and 10 parts by mass of N-beta (aminoethyl) -gamma-aminopropyl triethoxysilane, and mixing and stirring uniformly to obtain a mixture;
step 2, adding 70 parts by mass of deionized water and 2.5 parts by mass of nitric acid with the mass concentration of 68% into a reactor, heating to 60 ℃, dropwise adding the mixture obtained in the step 1 into the reactor in a stirring state for 3 hours, and after dropwise adding, carrying out heat preservation reaction for 2 hours to obtain 131 parts by mass of water-based organic silicon emulsion;
the second step is that: preparing a temporary antirust liquid for a color-coated sheet:
at normal temperature, 2.5 parts by mass of cerium sulfate, 10 parts by mass of potassium silicate, 1.2 parts by mass of sodium benzoate and 1.6 parts by mass of sodium ethylene diamine tetracetate are added into 50 parts by mass of deionized water and stirred to be dissolved, then the dissolved mixture is dripped into 48 parts by mass of the aqueous organosilicon emulsion prepared in the first step of the embodiment in a stirring state, the dripping time is 20 minutes, and the mixture is stirred for 10 minutes after the dripping is completed, so that the temporary antirust liquid for the color-coated plate is obtained.
Example 4 preparation method of temporary antirust liquid for color-coated sheet
In the embodiment, each mass part is 200 g;
the first step is as follows: the preparation method of the water-based organic silicon emulsion comprises the following steps:
step 1, mixing and stirring uniformly 40 parts by mass of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, 5 parts by mass of n-hexyltrimethoxy silane and 15 parts by mass of anilinomethyl triethoxy silane to obtain a mixture;
step 2, adding 90 parts by mass of deionized water and 15 parts by mass of oxalic acid into a reactor, heating to 50 ℃, dropwise adding the mixture obtained in the step 1 into the reactor in a stirring state for 2.5 hours, and after dropwise adding, keeping the temperature and reacting for 2 hours to obtain 165 parts by mass of water-based organic silicon emulsion;
the second step is that: preparing a temporary antirust liquid for a color-coated sheet:
at normal temperature, 2.5 parts by mass of cerium nitrate, 10 parts by mass of sodium silicate, 1.8 parts by mass of sodium benzoate and 2 parts by mass of sodium ethylene diamine tetracetate are added into 55 parts by mass of deionized water and stirred to be dissolved, then the dissolved mixture is dripped into 55 parts by mass of the aqueous organosilicon emulsion prepared in the first step in the stirring state, the dripping time is 20 minutes, and the mixture is stirred for 10 minutes after the dripping is finished, so that the temporary antirust liquid for the color-coated plate is obtained.
Example 5 preparation method of temporary antirust liquid for color-coated sheet
In the embodiment, each mass part is 200 g;
the first step is as follows: the preparation method of the water-based organic silicon emulsion comprises the following steps:
step 1, mixing and stirring uniformly 40 parts by mass of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, 5 parts by mass of n-hexyltrimethoxy silane and 15 parts by mass of anilinomethyl triethoxy silane to obtain a mixture;
step 2, adding 90 parts by mass of deionized water and 15 parts by mass of oxalic acid into a reactor, heating to 50 ℃, dropwise adding the mixture obtained in the step 1 into the reactor in a stirring state for 2.5 hours, and after dropwise adding, keeping the temperature and reacting for 2 hours to obtain 165 parts by mass of water-based organic silicon emulsion;
the second step is that: preparing a temporary antirust liquid for a color-coated sheet:
at normal temperature, 10 parts by mass of sodium silicate, 1.8 parts by mass of sodium benzoate and 2 parts by mass of sodium ethylene diamine tetracetate are added into 57.5 parts by mass of deionized water and stirred for dissolution, then the dissolved mixture is dripped into 55 parts by mass of the aqueous organosilicon emulsion prepared in the first step of the embodiment in a stirring state, the dripping time is 20 minutes, and stirring is carried out for 10 minutes after the dripping is completed, so as to obtain the temporary antirust liquid for the color-coated plate.
Example 6 preparation method of temporary antirust liquid for color-coated sheet
In the embodiment, each part by mass is 500 g;
the first step is as follows: the preparation method of the water-based organic silicon emulsion comprises the following steps:
step 1, mixing and stirring uniformly 20 parts by mass of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane and 3 parts by mass of octadecyl trimethoxy silane to obtain a mixture;
step 2, adding 95 parts by mass of deionized water and 1.5 parts by mass of nitric acid with the mass concentration of 68% into a reactor, heating to 50 ℃, dropwise adding the mixture obtained in the step 1 into the reactor in a stirring state for 2 hours, and after dropwise adding, carrying out heat preservation reaction for 2 hours to obtain 128 parts by mass of water-based organic silicon emulsion;
the second step is that: preparing a temporary antirust liquid for a color-coated sheet:
at normal temperature, 1.5 parts by mass of cerium acetate, 12 parts by mass of sodium silicate, 0.8 part by mass of ammonium benzoate and 1.8 parts by mass of sodium ethylene diamine tetracetate are added into 55 parts by mass of deionized water and stirred to be dissolved, then the dissolved mixture is dripped into 40 parts by mass of the aqueous organosilicon emulsion prepared in the first step of the embodiment in a stirring state, the dripping time is 20 minutes, and stirring is carried out for 5 minutes after the dripping is finished, so as to obtain the temporary antirust liquid for the color-coated plate.
Example 7 preparation method of temporary antirust liquid for color-coated sheet
In the embodiment, each part by mass is 500 g;
the first step is as follows: the preparation method of the water-based organic silicon emulsion comprises the following steps:
step 1, mixing and uniformly stirring 20 parts by mass of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane and 15 parts by mass of gamma-aminopropyl triethoxy silane to obtain a mixture;
step 2, adding 80 parts by mass of deionized water and 4 parts by mass of nitric acid with the mass concentration of 68% into a reactor, heating to 50 ℃, completely dropwise adding the mixture obtained in the step 1 into the reactor in a stirring state for 2 hours, and after dropwise adding, carrying out heat preservation reaction for 2 hours to obtain 125 parts by mass of water-based organic silicon emulsion;
the second step is that: preparing a temporary antirust liquid for a color-coated sheet:
at normal temperature, 1.5 parts by mass of cerium acetate, 12 parts by mass of sodium silicate, 0.8 part by mass of ammonium benzoate and 1.8 parts by mass of sodium ethylene diamine tetracetate are added into 55 parts by mass of deionized water and stirred to be dissolved, then the dissolved mixture is dripped into 40 parts by mass of the aqueous organosilicon emulsion prepared in the first step of the embodiment in a stirring state, the dripping time is 20 minutes, and stirring is carried out for 5 minutes after the dripping is finished, so as to obtain the temporary antirust liquid for the color-coated plate.
The effect test of the color-coated sheet after the temporary antirust liquid for treating the cold-rolled steel sheet base material comprises the following steps:
the cold rolled steel sheets used in the tests were taken from wuhan steel gmbh and cut into 10cm x 6cm for the following tests.
1. The test method is as follows:
the method comprises the steps of blade coating the cold-rolled steel plate with the temporary antirust liquid prepared in the embodiment 1-7 in sequence, drying at 85 ℃ to form a film, controlling the thickness of the film to be 1500-1800 mg per square meter, sequentially obtaining processed cold-rolled steel plate samples, numbering sample plates, sequentially taking 3 pieces of surfaces of the sample plates and the sample plates, slitting with a knife to destroy the surface film layer, enabling the scratch width to be not more than 2mm, then destroying the 6 pieces of surfaces, carrying out a salt spray test, and observing the corrosion resistance of the damaged area of the film layer. In the embodiment, the stability of the antirust liquid is poor, more precipitates are formed at the bottom of the antirust liquid, particles are formed on the wall of a container, and the surface of a sample plate after treatment is provided with the particles and is difficult to use.
The resulting treated cold rolled sheet samples were tested as follows:
(1) salt spray resistance test, 48 hour spray test (astm b117-2016 standard): the samples of the cold-rolled plates after the treatment are required to have no red rust for 48 hours;
(2) and (3) testing coating performance, performing an electrostatic powder spraying experiment on the sample plate, wherein the coating thickness is 40-70 um, drying and curing, and performing flat panel marking hundred-grid (the interval between cutting edges is 1mm) and 9J reverse impact experiments according to the GB/T13448-2006 standard, wherein the adhesive tapes in a flat panel marking hundred-grid area and a 9J reverse impact area are required to be stripped and not fall off.
From the above table, it can be seen that: compared with the example 4, the sample plate of the aqueous organosilicon emulsion containing no cerium salt is corroded in 24h of the cross-cut area, the sample plate of the aqueous organosilicon emulsion containing the cerium salt is corroded in 48h of the cross-cut area, the film layer of the aqueous organosilicon emulsion containing the cerium salt has certain protection effect on the cross-cut area by using the formula of the example 4, the sample plate treated by the example 4 and the example 5 is subjected to salt spray test for 24h, the component of the scratched and damaged area of the film layer is scraped to carry out XRF analysis, cerium element can be detected in the scraped component of the example 4, and therefore, the cerium salt conversion film of other areas has certain diffusion effect and is diffused to the worn area after the film layer is damaged and worn, and certain self-repairing and corrosion-retarding effects are realized on the damaged area; in example 6, when the silicone emulsion is prepared, the silane coupling agent containing amino groups is not added, and after the silicone emulsion and the inorganic metal salt are mixed and compounded, the temporary antirust liquid is poor in stability and difficult to use; in example 7, when the silicone emulsion was prepared, the silane coupling agent containing long chain alkyl was not added, the corrosion resistance of the prepared temporary rust preventive liquid was relatively poor, the red rust area for 48 hours was more than 10%, and cracking occurred at 9J impact after powder coating, which is caused by poor film toughness.
After the surface treatment is carried out on the cold-rolled steel plate base material by using the temporary antirust liquid for the color-coated plate, the cold-rolled steel plate base material has good corrosion resistance and coating property, and the use requirement of subsequent processing of the color-coated plate is met.
FIG. 1 is a morphology chart of a cold-rolled sample plate treated by the temporary antirust liquid prepared in the above example after powder spraying and a 9J reverse impact test, wherein the sample plate treated by the temporary antirust liquid prepared in example 6 has more particles on the surface and is not subjected to related performance detection; as can be seen from fig. 1: after the sample plate prepared in the embodiment 1-5 is treated by the temporary antirust liquid, after powder coating, the plate grids and 9J impact do not fall off, and the bonding performance is excellent; the samples treated with the temporary rust-proofing liquid prepared in example 7 did not peel off after powder coating, but did not peel off after 9J impact cracking, indicating that the temporary rust-proofing liquid prepared in example 7 formed a brittle film on the surface of the cold-rolled sheet.
Claims (10)
1. The preparation method of the temporary antirust liquid for the color-coated sheet is characterized in that the temporary antirust liquid is prepared from the following raw materials: 30-60 parts of water-based organic silicon emulsion, 0.5-5 parts of cerium salt, 5-30 parts of silicate, 0.5-5 parts of benzoate, 0.5-4 parts of ethylene diamine tetraacetic acid salt and 30-70 parts of deionized water;
the preparation method of the water-based organic silicon emulsion comprises the following steps:
step 1, mixing and stirring uniformly 20-40 parts by mass of an epoxy-containing silane coupling agent, 2-8 parts by mass of a long-chain alkyl-containing silane coupling agent and 10-20 parts by mass of an amino-containing silane coupling agent to obtain a mixture;
step 2, adding 60-100 parts by mass of deionized water and 0.5-20 parts by mass of an acid catalyst into a reactor, heating to 40-60 ℃, dropwise adding the mixture obtained in the step 1 into the reactor in a stirring state for 2-5 hours, and after dropwise adding, carrying out heat preservation reaction for 1-3 hours to obtain the catalyst;
the acid catalyst is one or more of glacial acetic acid, oxalic acid, 85wt% of phosphoric acid and 68wt% of nitric acid.
2. The preparation method according to claim 1, wherein the temporary antirust liquid is prepared from the following raw materials: 35-55 parts of water-based organic silicon emulsion, 1-3 parts of cerium salt, 10-15 parts of silicate, 0.5-2 parts of benzoate, 0.5-2 parts of ethylene diamine tetraacetic acid salt and 40-60 parts of deionized water.
3. The method according to claim 1 or 2, wherein said epoxy group-containing silane coupling agent has the structure R0-Si(OR1)3The structure of the silane coupling agent containing long-chain alkyl is R2-Si(OR1)3The structure of the silane coupling agent containing amino is R3-Si(OR1)3Wherein: r0Is gamma- (2, 3-epoxypropoxy) propyl; r1Is methyl, ethyl, propyl or isopropyl; r2Is alkyl with 6-20 carbon atoms in the main chain; r3Is gamma-aminopropyl, N-beta (aminoethyl) -gamma-aminopropyl or anilinomethyl.
4. The method according to claim 3, wherein the epoxy-containing silane coupling agent is γ - (2, 3-glycidoxy) propyltrimethoxysilane and/or γ - (2, 3-glycidoxy) propyltriethoxysilane; the silane coupling agent containing long-chain alkyl is one or more of n-hexyltrimethoxysilane, n-hexyltriethoxysilane, dodecyl-trimethoxysilane, dodecyl-triethoxysilane, octadecyl-trimethoxysilane and octadecyl-triethoxysilane; the amino-containing silane coupling agent is one or more of gamma-aminopropyltrimethoxysilane, gamma-aminopropyltriethoxysilane, N-beta (aminoethyl) -gamma-aminopropyltrimethoxysilane, N-beta (aminoethyl) -gamma-aminopropyltriethoxysilane, anilinomethyltrimethoxysilane and anilinomethyltriethoxysilane.
5. The method according to claim 1 or 2, wherein the cerium salt is one or more of cerium nitrate, cerium acetate, cerium sulfate and cerium phosphate.
6. The method according to claim 1 or 2, wherein the silicate is one or more of sodium silicate, potassium silicate, and magnesium silicate.
7. The method according to claim 1 or 2, wherein the benzoate is one or more of sodium benzoate, potassium benzoate, and ammonium benzoate.
8. The method of claim 1 or 2, wherein the edetate is one or more of potassium edetate, sodium edetate and ammonium edetate.
9. The temporary antirust liquid prepared by the preparation method of any one of claims 1 to 8 is applied to color-coated plates, and is characterized in that the coating film thickness is controlled to be 1200mg per square meter to 3000mg per square meter.
10. The use of claim 9, wherein the coating film applied to cold rolled steel sheet has a thickness of from 1500 to 3000mg per square meter.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2014539A1 (en) * | 1989-04-17 | 1990-10-17 | Shinichiro Umeda | Water borne metallic coating composition |
| CN104630765A (en) * | 2013-11-11 | 2015-05-20 | 安徽未来表面技术有限公司 | Environmental-protection type metal coating pre-treatment agent and preparation method thereof |
| CN107216938A (en) * | 2017-07-07 | 2017-09-29 | 荆门市拓达科技有限公司 | A kind of micro emulsion transformant metal rust-inhibiting liquid |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2014539A1 (en) * | 1989-04-17 | 1990-10-17 | Shinichiro Umeda | Water borne metallic coating composition |
| CN104630765A (en) * | 2013-11-11 | 2015-05-20 | 安徽未来表面技术有限公司 | Environmental-protection type metal coating pre-treatment agent and preparation method thereof |
| CN107216938A (en) * | 2017-07-07 | 2017-09-29 | 荆门市拓达科技有限公司 | A kind of micro emulsion transformant metal rust-inhibiting liquid |
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