CN110938350A - Epoxy primer for rail transit and preparation method thereof - Google Patents
Epoxy primer for rail transit and preparation method thereof Download PDFInfo
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- CN110938350A CN110938350A CN201911265871.5A CN201911265871A CN110938350A CN 110938350 A CN110938350 A CN 110938350A CN 201911265871 A CN201911265871 A CN 201911265871A CN 110938350 A CN110938350 A CN 110938350A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- 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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/20—Diluents or solvents
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/327—Aluminium phosphate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/328—Phosphates of heavy metals
Abstract
The invention relates to an epoxy primer for rail transit, belonging to the technical field of coatings. Comprises the following components in parts by weight: and (2) component A: 30-50 parts of epoxy resin, 15-30 parts of antirust material, 0.3-2 parts of conventional auxiliary agent, 0.5-2 parts of film-forming auxiliary agent, 0.1-2 parts of anti-settling agent, 0.1-1 part of thickening agent, 20-30 parts of deionized water A, 5-10 parts of filler, 1-5 parts of coloring pigment and 0.5-3 parts of functional auxiliary agent; and (B) component: 40-70 parts of epoxy curing agent, 30-60 parts of deionized water B and 1-5 parts of anti-flash rust auxiliary agent. The invention has the beneficial effects that: (1) low VOC, environmental protection and health; (2) the paint is non-toxic, does not contain heavy metal, and has high drying speed and good corrosion resistance; (3) the adhesive force of the paint film is improved, and the salt spray resistance of the paint film is obviously improved; (4) the water resistance of the paint film is obviously enhanced.
Description
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to an epoxy primer for rail transit and a preparation method thereof.
Background
With the acceleration of the urbanization process of China, the increasingly prominent traffic problem seriously affects the process of economic construction, and the development of urban rail transit is a better solution, so the requirement on the car body coating of the rail transit is higher and higher. However, the two-component epoxy primer used in the current market has certain selectivity on steel, aluminum materials and the like, and meanwhile, most of high-performance epoxy primers are solvent-based, have high VOC content, have large influence on the environment, and have dangers of explosion, fire and the like. Secondly, most of the high salt spray resistant water-based two-component epoxy primers currently circulating in the market contain heavy metals such as strontium and chromium, and are forbidden in the field of rail transit.
Disclosure of Invention
In order to solve the problems that high-performance epoxy primer in the market has high VOC content, contains heavy metal, has large influence on the environment and has dangers such as explosion, fire and the like, the invention provides the epoxy primer for rail transit and the preparation method thereof, so as to solve the problems. The invention relates to a two-component epoxy primer which has low VOC, high salt spray resistance and high hardness and has good adhesive force on steel and aluminum products. The water-based epoxy primer provided by the invention does not contain heavy metal, is quick to dry on the surface, is suitable for a coating process of rail transit, can reach 1000h in a neutral salt spray resistance experiment, and does not foam at a scribing position and a plate surface in a scribing test experiment.
The epoxy primer for rail transit consists of a component A and a component B. Wherein:
the component A comprises the following components in parts by weight: 30-50 parts of epoxy resin, 15-30 parts of antirust material, 0.1-0.15 part of defoaming agent A, 0.1-0.15 part of defoaming agent B, 0.1-0.2 part of wetting agent, 0.1-1.5 parts of dispersing agent, 0.5-2 parts of film-forming additive, 0.1-2 parts of anti-settling agent, 0.1-1 part of thickening agent, 20-30 parts of deionized water A, 5-10 parts of filler, 1-5 parts of coloring pigment and 0.5-3 parts of functional additive;
the component B comprises the following components in parts by weight: 40-70 parts of epoxy curing agent, 30-60 parts of deionized water B and 1-5 parts of anti-flash rust auxiliary agent.
Preferably, the epoxy primer for rail transit of the invention comprises the following components in parts by weight:
and (2) component A: 38-45 parts of epoxy resin, 20-25 parts of antirust material, 0.5-1.5 parts of conventional auxiliary agent, 0.1-0.15 part of defoaming agent A, 0.1-0.15 part of defoaming agent B, 0.1-0.2 part of wetting agent, 0.1-1.0 part of dispersing agent, 0.5-1.5 parts of film-forming auxiliary agent, 0.2-1 part of anti-settling agent, 0.3-0.8 part of thickening agent, 22-28 parts of deionized water A, 6-8 parts of filler, 2-4 parts of coloring pigment and 1-2 parts of functional auxiliary agent;
and (B) component: 50-65 parts of epoxy curing agent, 35-50 parts of deionized water B and 2-3 parts of anti-flash rust auxiliary agent.
Preferably, the epoxy resin is the Vast 6529 epoxy resin, the epoxy resin has the advantages of small molding shrinkage rate and good corrosion resistance, and the resin and the cosolvent thereof do not contain harmful air pollutants.
Preferably, the antirust material is one or more of zinc phosphate, modified aluminum tripolyphosphate, mica powder and modified wollastonite.
Preferably, the film forming auxiliary agent is one or two of ether film forming substances and alcohol ester film forming substances.
Preferably, the anti-settling agent is one or a combination of two of fumed silica and organic bentonite.
Preferably, the thickener is a polyurethane associative rheological aid.
Preferably, the filler is precipitated barium sulfate.
Preferably, the coloring pigment is one of titanium dioxide or iron oxide red.
Preferably, the functional assistant is a silane coupling agent, the specific model is MP200 of a Meiji chart, and the functional assistant has the advantage of remarkably improving the adhesive force between a paint film and a substrate.
Preferably, the epoxy curing agent is a vastly-produced 6870, which has the advantages of fast drying speed, high crosslinking density and no harmful air pollutants in the curing agent and the cosolvent thereof.
Preferably, the flash rust prevention aid is a metal chelate compound containing no nitrite.
The invention also aims to provide a preparation method of the epoxy primer for rail transit, which comprises the following specific steps:
(1) according to the weight parts, 20-30 parts of deionized water A, 0.1-0.15 part of defoaming agent A, 0.1-2 parts of anti-settling agent, 0.1-1.5 parts of dispersing agent and 0.5-2 parts of film forming additive are sequentially added into a grinding tank, and are dispersed for 15min under the condition that the rotating speed is 800r/min to form a mixed solution;
(2) firstly, adjusting the rotating speed of a grinding tank to 600-700 r/min, sequentially adding 1-5 parts of coloring pigment, 15-30 parts of antirust material and 5-10 parts of filler while stirring the mixed solution, uniformly mixing, adding 80 parts of zirconium beads by weight, adjusting the rotating speed to 3000r/min, grinding at the temperature lower than 50 ℃, and grinding until the fineness is less than 30 mu m to form slurry;
(3) and (3) preparing a finished product:
a. adding 30-50 parts of epoxy resin, 0.1-0.15 part of defoaming agent B, 0.1-0.2 part of wetting agent and the slurry in sequence by weight, adjusting the rotating speed to 500-600 r/min, adding 0.3-0.8 part of thickening agent and adjusting to proper viscosity to obtain a component A;
b. sequentially adding an epoxy curing agent, deionized water and an anti-flash rust auxiliary agent according to weight parts, and adjusting the rotating speed to be 500-600 r/min to prepare a component B;
(4) the using method comprises the following steps: uniformly mixing the prepared component A and the component B, wherein the component A comprises the following components in percentage by mass: and (3) adding deionized water to dilute the component B at a ratio of 4-6: 1 until the paint is coated in a 4-cup manner for 20-30 s, spraying the prepared paint onto a carbon steel plate with the thickness of 50-60 mu m, naturally curing for seven days in a curing room with the temperature of 25-30 ℃ and the humidity of less than 40%, and testing the performance of a paint film.
Preferably, the specific steps are as follows:
(1) according to the weight parts, 20-30 parts of deionized water A, 0.1-0.15 part of defoaming agent A, 0.1-2 parts of anti-settling agent, 0.1-1.5 parts of dispersing agent and 0.5-1.5 parts of film-forming assistant are sequentially added into a grinding tank, and are dispersed for 15min under the condition that the rotating speed is 800r/min to form a mixed solution;
(2) firstly, adjusting the rotating speed of a grinding tank to 600-700 r/min, sequentially adding 1-5 parts of coloring pigment, 15-30 parts of antirust material and 5-10 parts of filler while stirring the mixed solution, uniformly mixing, adding 80 parts of zirconium beads by weight, adjusting the rotating speed to 3000r/min, grinding at the temperature lower than 50 ℃, and grinding until the fineness is less than 30 mu m to form slurry;
(3) and (3) preparing a finished product:
a. adding 30-50 parts of epoxy resin, 0.1-0.15 part of defoaming agent B, 0.1-0.2 part of wetting agent and the slurry in sequence by weight, adjusting the rotating speed to 500-600 r/min, adding 0.3-0.8 part of thickening agent and adjusting to proper viscosity to obtain a component A;
b. sequentially adding an epoxy curing agent, deionized water and an anti-flash rust auxiliary agent according to weight parts, and adjusting the rotating speed to be 500-600 r/min to prepare a component B;
(4) the using method comprises the following steps: uniformly mixing the prepared component A and the component B, wherein the component A comprises the following components in percentage by mass: and (3) adding deionized water to dilute the component B at a ratio of 4-6: 1 until the paint is coated in a 4-cup manner for 20-30 s, spraying the prepared paint onto a carbon steel plate with the thickness of 50-60 mu m, naturally curing for seven days in a curing room with the temperature of 25-30 ℃ and the humidity of less than 40%, and testing the performance of a paint film.
Preferably, the step (4) uses a method in which the mixing ratio of the component a and the component B is 5:1 by mass.
The invention has the beneficial effects that:
(1) the water is used as a dispersing medium, so that the VOC is low, the environment is protected, the health is realized, and the construction can be carried out in a relatively closed place where the use and the construction need to be carried out simultaneously;
(2) the paint is nontoxic, does not contain heavy metal, has high drying speed and good corrosion resistance, can reach 1000h in a neutral salt spray resistance experiment, does not bubble at a scribing part and a plate surface, is not corroded by more than 2mm, and meets the requirements of a rail transit construction process, heavy metal detection and performance;
(3) the silane coupling agent adopted by the invention can be hydrolyzed into silicon hydroxyl, the hydroxyl on the surface of the substrate forms hydrogen bonds, and meanwhile, the silicon hydroxyl among the silane molecules are mutually condensed and oligomerized to form a film with a net structure which is attached to the surface of the substrate, so that the adhesive force of the paint film is improved, and the salt spray resistance of the paint film is obviously improved;
(4) the zinc phosphate can be slowly hydrolyzed into phosphoric acid ions in the coating, the phosphoric acid ions react with ferrous ions generated in a cathode area of the metal surface to passivate the metal surface, and secondly, the zinc ions can form an insoluble complex to play a role in cathodic protection; the modified aluminum tripolyphosphate is nontoxic, and polyphosphate radical ions of the modified aluminum tripolyphosphate have strong complexing capability on divalent and trivalent iron ions to form a passivation film; the sheet structures of the mica powder and the modified wollastonite can obviously enhance the water permeability resistance of the paint film.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The defoamer and wetting agent of the present invention were purchased from TEGO (TEGO);
the flash rust inhibitor was purchased from modesty (shanghai) chemical ltd;
thickeners were purchased from modesty (shanghai) chemical ltd;
epoxy resin and epoxy curing agent are purchased from Vast;
dispersants were purchased from birk chemistry;
the anti-settling agent is purchased from Haimines;
the antirust material is purchased from Shijiazhuangxin chemical industry Co Ltd;
the coloring pigment is purchased from the titanium python industry;
other raw materials in the invention are all commercial products.
Example 1
The epoxy primer for rail transit comprises the following components in parts by weight:
and (2) component A: 40 parts of epoxy resin, 9 parts of zinc phosphate, 5 parts of modified aluminum tripolyphosphate, 3 parts of mica powder, 3 parts of modified wollastonite, 0.2 part of defoaming agent, 1.0 part of dispersing agent, 0.2 part of wetting agent, 1.0 part of film-forming assistant, 0.2 part of organic bentonite, 0.1-1 part of thickening agent, 20 parts of deionized water A, 10 parts of barium sulfate, 2 parts of iron oxide red and 1 part of silane coupling agent;
and (B) component: 64 parts of epoxy curing agent, 31 parts of deionized water B and 5 parts of flash rust prevention auxiliary agent.
The invention provides a preparation method of a water-based epoxy primer for rail transit, which comprises the following steps:
(1) according to the weight portion, 20 portions of deionized water A, 0.1 portion of defoaming agent A, 0.2 portion of organic bentonite and 1 portion of dispersing agent are sequentially added into a grinding tank, and the mixture is dispersed for 15min under the condition that the rotating speed is 800r/min to form mixed liquid;
(2) firstly, adjusting the rotating speed of a grinding tank to 600-700 r/min, sequentially adding 2 parts of iron oxide red, 9 parts of zinc phosphate, 5 parts of modified aluminum tripolyphosphate, 3 parts of mica powder, 3 parts of modified wollastonite and 15 parts of barium sulfate while stirring a mixed solution, uniformly mixing, adding 80 parts of zirconium beads in parts by weight, adjusting the rotating speed to 3000r/min, grinding at the temperature lower than 50 ℃, and grinding until the fineness is less than 30 mu m to form a slurry I;
(3) and (3) preparing a finished product:
a. adding 6529 parts of epoxy resin 40, 0.1 part of defoaming agent B, 0.2 part of wetting agent, 1 part of silane coupling agent and slurry I in sequence in parts by weight, adjusting the rotating speed to 500-600 r/min, and adding 0.2 part of thickening agent to adjust to proper viscosity to obtain a component A;
b. 6870 parts of epoxy curing agent 64, deionized water B31 and anti-flash rust additive 5 are sequentially added according to the weight parts, and the rotating speed is adjusted to be 500-600 r/min to prepare a component B;
(4) the using method comprises the following steps: uniformly mixing the prepared component A and the component B, wherein the component A comprises the following components in percentage by mass: and (3) adding deionized water into the component B which is 5:1 for diluting until the paint is coated in a 4-cup manner for 20-30 s, spraying the prepared paint to a carbon steel plate with the thickness of 50-60 mu m, and naturally curing in a curing room with the temperature of 25-30 ℃ and the humidity of less than 40% for seven days to test the performance of the paint film.
Example 2
The epoxy primer for rail transit comprises the following components in parts by weight:
and (2) component A: 40 parts of epoxy resin, 9 parts of zinc phosphate, 5 parts of modified aluminum tripolyphosphate, 3 parts of mica powder, 3 parts of modified wollastonite, 0.2 part of defoaming agent, 1.0 part of dispersing agent, 0.2 part of wetting agent, 1.0 part of film-forming assistant, 0.2 part of organic bentonite, 0.1-1 part of thickening agent, 20 parts of deionized water A, 10 parts of barium sulfate, 2 parts of iron oxide red and 1 part of silane coupling agent;
and (B) component: 64 parts of epoxy curing agent, 31 parts of deionized water B and 5 parts of flash rust prevention auxiliary agent.
The invention provides a preparation method of a water-based epoxy primer for rail transit, which comprises the following steps:
(1) according to the weight portion, 20 portions of deionized water A, 0.1 portion of defoaming agent A, 0.2 portion of organic bentonite and 1 portion of dispersing agent are sequentially added into a grinding tank, and the mixture is dispersed for 15min under the condition that the rotating speed is 800r/min to form mixed liquid;
(2) firstly, adjusting the rotating speed of a grinding tank to 600-700 r/min, sequentially adding 2 parts of iron oxide red, 9 parts of zinc phosphate, 5 parts of modified aluminum tripolyphosphate, 3 parts of mica powder, 3 parts of modified wollastonite and 15 parts of barium sulfate while stirring a mixed solution, uniformly mixing, adding 80 parts of zirconium beads in parts by weight, adjusting the rotating speed to 3000r/min, grinding at the temperature lower than 50 ℃, and grinding until the fineness is less than 30 mu m to form a slurry I;
(3) and (3) preparing a finished product:
a. adding 6529 parts of epoxy resin 40, 0.1 part of defoaming agent B, 0.2 part of wetting agent, 1 part of silane coupling agent and slurry I in sequence in parts by weight, adjusting the rotating speed to 500-600 r/min, and adding 0.2 part of thickening agent to adjust to proper viscosity to obtain a component A;
b. 6870 parts of epoxy curing agent 64, deionized water B31 and anti-flash rust additive 5 are sequentially added according to the weight parts, and the rotating speed is adjusted to be 500-600 r/min to prepare a component B;
(4) the using method comprises the following steps: uniformly mixing the prepared component A and the component B, wherein the component A comprises the following components in percentage by mass: and (3) adding deionized water to dilute the component B to 4:1, coating for 20-30 s in a coating-4 cup, spraying the prepared coating to a carbon steel plate with the thickness of 50-60 mu m, and naturally curing in a curing room with the temperature of 25-30 ℃ and the humidity of less than 40% for seven days to test the performance of the paint film.
Example 3
The epoxy primer for rail transit comprises the following components in parts by weight:
and (2) component A: 40 parts of epoxy resin, 9 parts of zinc phosphate, 5 parts of modified aluminum tripolyphosphate, 3 parts of mica powder, 3 parts of modified wollastonite, 0.2 part of defoaming agent, 1.0 part of dispersing agent, 0.2 part of wetting agent, 1.0 part of film-forming assistant, 0.2 part of organic bentonite, 0.1-1 part of thickening agent, 20 parts of deionized water A, 10 parts of barium sulfate, 2 parts of iron oxide red and 1 part of silane coupling agent;
and (B) component: 64 parts of epoxy curing agent, 31 parts of deionized water B and 5 parts of flash rust prevention auxiliary agent.
The invention provides a preparation method of a water-based epoxy primer for rail transit, which comprises the following steps:
(1) according to the weight portion, 20 portions of deionized water A, 0.1 portion of defoaming agent A, 0.2 portion of organic bentonite and 1 portion of dispersing agent are sequentially added into a grinding tank, and the mixture is dispersed for 15min under the condition that the rotating speed is 800r/min to form a mixed solution;
(2) firstly, adjusting the rotating speed of a grinding tank to 600-700 r/min, sequentially adding 2 parts of iron oxide red, 9 parts of zinc phosphate, 5 parts of modified aluminum tripolyphosphate, 3 parts of mica powder, 3 parts of modified wollastonite and 15 parts of barium sulfate while stirring a mixed solution, uniformly mixing, adding 80 parts of zirconium beads in parts by weight, adjusting the rotating speed to 3000r/min, grinding at the temperature lower than 50 ℃, and grinding until the fineness is less than 30 mu m to form a slurry I;
(3) and (3) preparing a finished product:
a. adding 6529 parts of epoxy resin 40, 0.1 part of defoaming agent B, 0.2 part of wetting agent, 1 part of silane coupling agent and slurry I in sequence in parts by weight, adjusting the rotating speed to 500-600 r/min, and adding 0.2 part of thickening agent to adjust to proper viscosity to obtain a component A;
b. 6870 parts of epoxy curing agent 64, deionized water B31 and anti-flash rust additive 5 are sequentially added according to the weight parts, and the rotating speed is adjusted to be 500-600 r/min to prepare a component B;
(4) the using method comprises the following steps: uniformly mixing the prepared component A and the component B, wherein the component A comprises the following components in percentage by mass: and (3) adding deionized water into the component B which is 6:1 for diluting until the paint is coated in a 4-cup manner for 20-30 s, spraying the prepared paint to a carbon steel plate with the thickness of 50-60 mu m, and naturally curing in a curing room with the temperature of 25-30 ℃ and the humidity of less than 40% for seven days to test the performance of the paint film.
Comparative example 1
An epoxy primer comprises the following components in parts by weight:
and (2) component A: 40 parts of epoxy resin, 14 parts of zinc phosphate, 16 parts of mica powder, 6 parts of modified wollastonite, 2 parts of a defoaming agent, 4 parts of a dispersing agent, 2 parts of a wetting agent, 4 parts of organic bentonite, 0.5 part of a thickening agent, 10 parts of deionized water, 14 parts of barium sulfate, 4 parts of iron oxide red and 1 part of a silane coupling agent;
and (B) component: 12 parts of epoxy curing agent, 10 parts of dipropylene glycol butyl ether and 5 parts of flash rust prevention auxiliary agent.
The preparation method comprises the following specific steps:
(1) according to the weight portion, 10 portions of deionized water, 2 portions of defoaming agent, 4 portions of organic bentonite and 4 portions of dispersing agent are sequentially added into a grinding tank, and the mixture is dispersed for 15min under the condition that the rotating speed is 800r/min to form mixed liquid;
(2) firstly, adjusting the rotating speed of a grinding tank to 600-700 r/min, sequentially adding 4 parts of iron oxide red, 14 parts of zinc phosphate, 16 parts of mica powder, 6 parts of modified wollastonite and 14 parts of barium sulfate while stirring the mixed solution, uniformly mixing, adding 80 parts of zirconium beads according to the parts by weight, adjusting the rotating speed to 3000r/min, grinding at the temperature of lower than 50 ℃, and grinding until the fineness is less than 30 mu m to form slurry I;
(3) and (3) preparing a finished product:
a. adding 40 parts of epoxy resin, 2 parts of wetting agent, 1 part of silane coupling agent and slurry I in sequence according to parts by weight, adjusting the rotating speed to be 500-600 r/min, and adding 0.5 part of thickening agent to adjust the viscosity to be proper to obtain a component A;
b. sequentially adding 12 parts of epoxy curing agent, 10 parts of dipropylene glycol butyl ether and 5 parts of flash rust prevention auxiliary agent by weight, and adjusting the rotating speed to 500-600 r/min to prepare a component B;
(4) the using method comprises the following steps: uniformly mixing the prepared component A and the component B, wherein the component A comprises the following components in percentage by mass: and (3) adding deionized water into the component B which is 5:1 for diluting until the paint is coated in a 4-cup manner for 20-30 s, spraying the prepared paint to a carbon steel plate with the thickness of 50-60 mu m, and naturally curing in a curing room with the temperature of 25-30 ℃ and the humidity of less than 40% for seven days to test the performance of the paint film.
Comparative example 2
An epoxy primer comprises the following components in parts by weight:
45 parts of epoxy resin, 2 parts of zinc phosphate, 3 parts of aluminum tripolyphosphate, 9 parts of silica sol, 14 parts of titanium dioxide, 0.25 part of defoaming agent, 0.25 part of dispersing agent, 0.25 part of wetting agent, 0.5 part of film-forming assistant, 11 parts of deionized water, 3 parts of barium sulfate, 10 parts of iron oxide red and 0.3 part of thickening agent.
The preparation method comprises the following specific steps:
(1) according to the weight portion, 11 portions of deionized water, 0.25 portion of defoaming agent and 0.25 portion of dispersing agent are sequentially added into a grinding tank, and the mixture is dispersed for 15min under the condition that the rotating speed is 800r/min to form a mixed solution;
(2) firstly, adjusting the rotating speed of a grinding tank to 600-700 r/min, sequentially adding 10 parts of iron oxide red, 2 parts of zinc phosphate, 3 parts of modified aluminum tripolyphosphate, 9 parts of silica sol, 14 parts of titanium dioxide and 3 parts of barium sulfate while stirring a mixed solution, uniformly mixing, adding 80 parts of zirconium beads in parts by weight, adjusting the rotating speed to 3000r/min, grinding at the temperature lower than 50 ℃, and grinding until the fineness is less than 30 mu m to form slurry I;
(3) and (3) preparing a finished product: adding 45 parts of epoxy resin, 0.25 part of wetting agent, 0.5 part of film-forming assistant and the slurry I in sequence according to the parts by weight, adjusting the rotating speed to be 500-600 r/min, and adding 0.3 part of thickening agent to adjust the viscosity to be proper to obtain the epoxy primer.
(4) The using method comprises the following steps: and (3) taking epoxy primer, adding deionized water to dilute the epoxy primer until the paint is coated in a 4-cup manner for 20-30 s, spraying the prepared paint to a carbon steel plate, wherein the thickness of the paint is 50-60 mu m, and naturally curing the paint in a curing room with the humidity of less than 40% at 25-30 ℃ for seven days to test the performance of the paint film.
The test comparison of example 1, example 2 and example 3 with the test comparison of comparative example 1 and comparative example 2 shows the following test results in table 1:
TABLE 1 product test results
As can be seen from the above table, as can be seen from the performance tests in examples 1 to 3, the ratio of the epoxy resin to the curing agent has a large influence on the performance, the crosslinking ratio is too high, the paint film has large brittleness, and the impact resistance and the toughness are poor, so that the salt spray resistance is poor; the crosslinking proportion is too low, the paint film has better toughness and good impact resistance, but the hardness is lower, the density of the paint film is low, and further the salt spray resistance is poorer.
Although the present invention has been described in detail by way of preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The epoxy primer for rail transit is characterized by consisting of a component A and a component B; wherein:
the component A comprises the following components in parts by weight: 30-50 parts of epoxy resin, 15-30 parts of antirust material, 0.1-0.15 part of defoaming agent A, 0.1-0.15 part of defoaming agent B, 0.1-0.2 part of wetting agent, 0.1-1.5 parts of dispersing agent, 0.5-2 parts of film-forming additive, 0.1-2 parts of anti-settling agent, 0.1-1 part of thickening agent, 20-30 parts of deionized water A, 5-10 parts of filler, 1-5 parts of coloring pigment and 0.5-3 parts of functional additive;
the component B comprises the following components in parts by weight: 40-70 parts of epoxy curing agent, 30-60 parts of deionized water B and 1-5 parts of anti-flash rust auxiliary agent.
2. The epoxy primer for rail transit of claim 1, comprising the following components in parts by weight:
and (2) component A: 38-45 parts of epoxy resin, 20-25 parts of antirust material, 0.1-0.15 part of defoaming agent A, 0.1-0.15 part of defoaming agent B, 0.1-0.2 part of wetting agent, 0.1-1.0 part of dispersing agent, 0.5-1.5 parts of film-forming assistant, 0.2-1 part of anti-settling agent, 0.3-0.8 part of thickening agent, 22-28 parts of deionized water A, 6-8 parts of filler, 2-4 parts of coloring pigment and 1-2 parts of functional assistant;
and (B) component: 50-65 parts of epoxy curing agent, 35-50 parts of deionized water B and 2-3 parts of anti-flash rust auxiliary agent.
3. An epoxy primer for rail traffic as recited in claim 1 wherein the epoxy resin is Vast 6529.
4. The epoxy primer for rail transit of claim 1, wherein the rust inhibitor is a combination of one or more of zinc phosphate, modified aluminum tripolyphosphate, mica powder, and modified wollastonite.
5. The epoxy primer for rail transit of claim 1, wherein the coalescent is one or a combination of ether and alcohol ester film forming materials.
6. The epoxy primer for rail transit of claim 1, wherein the anti-settling agent is one or a combination of two of fumed silica and organobentonite.
7. The epoxy primer for rail transit of claim 1, wherein the thickener is a polyurethane associative rheology aid.
8. The epoxy primer for rail transit of claim 1, wherein the filler is precipitated barium sulfate;
further preferably, the coloring pigment is one of titanium dioxide or iron oxide red;
further preferably, the functional assistant is a silane coupling agent, and the specific model is MP200 of a Meiji diagram;
further preferably, the epoxy curing agent is vastly 6870;
further preferably, the flash rust prevention aid is a metal chelate compound containing no nitrite.
9. The preparation method of the epoxy primer for rail transit is characterized by comprising the following specific steps of:
(1) according to the weight parts, 20-30 parts of deionized water A, 0.1-0.15 part of defoaming agent A, 0.1-2 parts of anti-settling agent, 0.1-1.5 parts of dispersing agent and 0.5-2 parts of film forming additive are sequentially added into a grinding tank, and are dispersed for 15min under the condition that the rotating speed is 800r/min to form a mixed solution;
(2) firstly, adjusting the rotating speed of a grinding tank to 600-700 r/min, sequentially adding 1-5 parts of coloring pigment, 15-30 parts of antirust material and 5-10 parts of filler while stirring the mixed solution, uniformly mixing, adding 80 parts of zirconium beads by weight, adjusting the rotating speed to 3000r/min, grinding at the temperature lower than 50 ℃, and grinding until the fineness is less than 30 mu m to form slurry;
(3) and (3) preparing a finished product:
a. adding 30-50 parts of epoxy resin, 0.1-0.15 part of defoaming agent B, 0.1-0.2 part of wetting agent and the slurry in sequence by weight, adjusting the rotating speed to 500-600 r/min, adding 0.3-0.8 part of thickening agent and adjusting to proper viscosity to obtain a component A;
b. adding 40-70 parts of epoxy curing agent, 30-60 parts of deionized water B and 1-5 parts of anti-flash rust additive in sequence by weight, and adjusting the rotating speed to 500-600 r/min to obtain the component B.
10. The method for preparing the epoxy primer for rail transit according to claim 9, comprising the following steps:
(1) according to the weight parts, 22-28 parts of deionized water A, 0.1-0.15 part of defoaming agent A, 0.1-2 parts of anti-settling agent, 0.1-1.0 part of dispersing agent and 0.5-1.5 parts of film forming additive are sequentially added into a grinding tank, and are dispersed for 15min under the condition that the rotating speed is 800r/min to form a mixed solution;
(2) firstly, adjusting the rotating speed of a grinding tank to 600-700 r/min, sequentially adding 2-4 parts of coloring pigment, 20-25 parts of antirust material and 6-8 parts of filler while stirring the mixed solution, uniformly mixing, adding 80 parts of zirconium beads by weight, adjusting the rotating speed to 3000r/min, grinding at the temperature lower than 50 ℃, and grinding until the fineness is less than 30 mu m to form slurry;
(3) and (3) preparing a finished product:
a. sequentially adding 38-45 parts of epoxy resin, 0.1-0.15 part of defoaming agent B, 0.1-0.2 part of wetting agent and the slurry according to parts by weight, adjusting the rotating speed to 500-600 r/min, and adding 0.3-0.8 part of thickening agent to adjust to proper viscosity to obtain a component A;
b. and sequentially adding 50-65 parts of epoxy curing agent, 35-50 parts of deionized water B and 2-3 parts of anti-flash rust additive by weight, and adjusting the rotating speed to 500-600 r/min to obtain the component B.
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| CN201911265871.5A CN110938350A (en) | 2019-12-11 | 2019-12-11 | Epoxy primer for rail transit and preparation method thereof |
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