CN113773705A - Aqueous polyvinylidene chloride single-component anti-rust primer and preparation method thereof - Google Patents
Aqueous polyvinylidene chloride single-component anti-rust primer and preparation method thereof Download PDFInfo
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- CN113773705A CN113773705A CN202111332995.8A CN202111332995A CN113773705A CN 113773705 A CN113773705 A CN 113773705A CN 202111332995 A CN202111332995 A CN 202111332995A CN 113773705 A CN113773705 A CN 113773705A
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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
- C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
- C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D127/04—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C09D127/08—Homopolymers or copolymers of vinylidene chloride
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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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Abstract
An aqueous polyvinylidene chloride single-component anti-rust primer and a preparation method thereof, belonging to the technical field of corrosion prevention and rust prevention. 40-60 parts of aqueous polyvinylidene chloride resin; 20-50% of pigment and filler; 0.5-10% of an auxiliary agent; 1-2 parts of cosolvent; and a proper amount of deionized water. The invention has the advantages that the VOC content in the coating is very low, the diluent is water, and the VOC emission in the coating process is extremely low; the coating film has excellent water resistance, salt water resistance and salt spray resistance, strong adhesive force and good flexibility. The waterborne polyvinylidene chloride single-component anti-rust primer disclosed by the invention has the VOC content of less than 10g/L, the water resistance and the salt water resistance of more than 720h, and the salt spray resistance of more than 500 h.
Description
Technical Field
The invention belongs to the technical field of corrosion prevention and rust prevention, and relates to aqueous polyvinylidene chloride single-component rust-proof primer and a preparation method thereof.
Background
The resins commonly used in the water-based single-component antirust primer on the market at present are water-based alkyd resin, water-based acrylic resin and water-based epoxy ester resin. The water-based single-component antirust primer prepared from the resins has good water resistance (240 h), salt water resistance (240 h) and salt fog resistance (240 h), but the VOC (volatile organic compound) content of the paint is higher and is more than 100 g/L.
At present, strict limitation on VOC emission in the anticorrosion coating industry is required, especially the VOC emission is required to be monitored at fixed points and in fixed time, and enterprises requiring large-scale anticorrosion coating operation have higher requirements on the VOC emission in the construction process, so that the development of the water-based anticorrosion coating with lower VOC content is required.
The water-based alkyd antirust primer is generally prepared from water-soluble alkyd resin, and the resin and a formula contain a large amount of solvent, so that the VOC content of the product is very high and is close to 300 g/L; the water resistance, salt water resistance and salt spray resistance of the product are 168 h.
The water-based acrylic acid antirust primer generally adopts acrylic acid emulsion, a certain amount of solvent is contained in the formula, and the VOC content of the product is higher and is close to 150 g/L; the water resistance, salt water resistance and salt spray resistance of the product reach 240 hours.
The waterborne epoxy ester antirust primer generally adopts epoxy ester dispersoid, resin and a formula contain a certain amount of solvent, and the VOC content of the product is higher and is close to 200 g/L; the water resistance, salt water resistance and salt spray resistance of the product reach 300 h.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a water-based polyvinylidene chloride single-component anti-rust primer and a preparation method thereof.
The aqueous polyvinylidene chloride single-component anti-rust primer comprises the following components in percentage by weight:
40-60 parts of aqueous polyvinylidene chloride resin;
20-50% of pigment and filler;
0.5-10% of an auxiliary agent;
1-2 parts of cosolvent;
and a proper amount of deionized water.
The aqueous polyvinylidene chloride resin is one or a mixture of more of VDC (vinylidene chloride)/VC (vinyl chloride), VDC (vinylidene chloride)/AN (acrylonitrile)/VDC (vinylidene chloride)/MMA (acrylic acid) copolymers.
The pigment and filler is a mixture of iron oxide red, iron oxide yellow, titanium dioxide, carbon black, superfine modified inorganic phosphate antirust pigment, organic antirust pigment, ion exchange antirust pigment, barium sulfate, talcum powder and mica powder.
The superfine modified inorganic phosphate antirust pigment, the organic antirust pigment and the ion exchange antirust pigment form the composite antirust pigment.
The auxiliary agent is a mixture of a wetting dispersant, a surfactant, a defoaming agent, an anti-flash rust agent and a thickening agent.
The wetting dispersant is one or the mixture of two of ammonium salt solution of acrylate copolymer and high molecular weight block copolymer solution containing pigment affinity group.
The surfactant is one or mixture of ethylene oxide copolymer and propylene oxide copolymer.
The defoaming agent is one or a mixture of mineral oil and siloxane.
The flash rust inhibitor is one or a mixture of sodium nitrite aqueous solution and organic amine aqueous solution.
The thickener is one or more of polyurethane, cellulose, bentonite, and gas phase silica.
The cosolvent is a mixture of ethylene glycol butyl ether, diethylene glycol butyl ether, propylene glycol methyl ether, dipropylene glycol butyl ether and alcohol ester twelve.
A preparation method of aqueous polyvinylidene chloride single-component anti-rust primer comprises the following steps:
step 1, preparing raw materials according to the following components by weight:
40-60 parts of aqueous polyvinylidene chloride resin;
20-50% of pigment and filler;
0.5-10% of an auxiliary agent;
1-2 parts of cosolvent;
and a proper amount of deionized water.
The aqueous polyvinylidene chloride resin is one or a mixture of more of VDC (vinylidene chloride)/VC (vinyl chloride), VDC (vinylidene chloride)/AN (acrylonitrile)/VDC (vinylidene chloride)/MMA (acrylic acid) copolymers.
The pigment and filler is a mixture of iron oxide red, iron oxide yellow, titanium dioxide, carbon black, superfine modified inorganic phosphate antirust pigment, organic antirust pigment, ion exchange antirust pigment, barium sulfate, talcum powder and mica powder.
The superfine modified inorganic phosphate antirust pigment, the organic antirust pigment and the ion exchange antirust pigment form the composite antirust pigment.
The auxiliary agent is a mixture of a wetting dispersant, a surfactant, a defoaming agent, an anti-flash rust agent and a thickening agent.
The wetting dispersant is one or the mixture of two of ammonium salt solution of acrylate copolymer and high molecular weight block copolymer solution containing pigment affinity group.
The surfactant is one or mixture of ethylene oxide copolymer and propylene oxide copolymer.
The defoaming agent is one or a mixture of mineral oil and siloxane.
The flash rust inhibitor is one or a mixture of sodium nitrite aqueous solution and organic amine aqueous solution.
The thickener is one or more of polyurethane, cellulose, bentonite, and gas phase silica.
The cosolvent is a mixture of ethylene glycol butyl ether, diethylene glycol butyl ether, propylene glycol methyl ether, dipropylene glycol butyl ether and alcohol ester twelve.
Step 2, preparing water slurry
Deionized water was added to the stainless steel vessel and the disperser was started to stir at low speed (300 and 500 rpm).
Step 3. mixing the materials
And (2) sequentially adding a wetting dispersant and a surfactant into the stainless steel container under the condition of low-speed stirring (300-.
Step 4. grinding the slurry
And grinding the dispersed slurry by a sand mill, and measuring the fineness of the slurry by a scraper fineness meter until the fineness is less than or equal to 60 mu m.
Step 5 paint preparation
And sequentially adding the aqueous polyvinylidene chloride resin, the cosolvent, the defoamer, the flash rust inhibitor and the thickener into the ground slurry under the condition of medium-speed stirring (500-800 rpm) and fully and uniformly stirring to obtain the aqueous polyvinylidene chloride single-component antirust primer.
The invention is compared with the prior invention patents: aqueous polyvinylidene chloride rust-proof primer and preparation method thereof, patent numbers: CN200710066723.1 is an anti-rust primer for protecting rusty metal, which mainly utilizes the reaction of tannic acid and phosphoric acid with metal to generate chelate, and the acidity and the barrier property of polyvinylidene chloride latex, can dissolve and purify rust on the surface of a rusty base material, has good adhesive force with the base material, and has certain barrier property to external moisture and oxygen, water resistance of 48h, salt water resistance of 96h and adhesive force of 2 grade. The formula contains 5-20 weight percent of isopropanol solvent, and the VOC content is more than 50 g/L. In addition, the color of the coating film is single, and only black can be presented.
Compared with the prior art, the antirust primer disclosed by the invention has the advantages of more excellent water resistance (720 h), salt water resistance (720 h), adhesive force (0 level), extremely low VOC content (less than 10 g/L), and rich coating colors, such as white, iron red, iron yellow, gray and the like. The antirust primer is mainly used for the surface of a metal base material after manual or mechanical polishing and sand blowing and shot blasting treatment, and can also be matched with the antirust primer in the prior patent.
The excellent performance of the anti-corrosive primer disclosed by the invention not only utilizes the acidity and barrier property of polyvinylidene chloride latex, but also has a key factor of containing a proper proportion of compounded high-performance anti-corrosive pigment in the formula. Compared with the prior patent that tannic acid and phosphoric acid react with metal to generate a chelate passivation layer to achieve the purpose of rust prevention, the rust prevention mechanism of the rust prevention primer not only has the advantage that a large amount of phosphate radicals in inorganic phosphate form a denser insoluble passivation layer with metal ions on the surface of a base material (the activity of the superfine modified inorganic phosphate rust prevention pigment is much higher than that of the common phosphate rust prevention pigment), but also has the advantage that the coating film has excellent corrosion inhibition effect by matching with the organic rust prevention pigment; in addition, the ion exchange antirust pigment can exchange hydrogen ions on the coating film and the base material by calcium ions, so that acidic substances are neutralized, a higher pH value can be maintained, the corrosion of external moisture and chloride ions is further inhibited, the calcium ions can be mutually combined with the metal oxide film to form a protective layer, the metal base material is further protected, and the salt spray resistance of the finally prepared coating film can reach more than 500 h.
The invention has the advantages that the VOC content in the coating is very low, the diluent is water, and the VOC emission in the coating process is extremely low; the coating film has excellent water resistance, salt water resistance and salt spray resistance, strong adhesive force and good flexibility.
The waterborne polyvinylidene chloride single-component anti-rust primer disclosed by the invention has the VOC content of less than 10g/L, the water resistance and the salt water resistance of more than 720h, and the salt spray resistance of more than 500 h.
Detailed Description
It will be apparent that those skilled in the art can make many modifications and variations based on the spirit of the present invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element, component or section is referred to as being "connected" to another element, component or section, it can be directly connected to the other element or section or intervening elements or sections may also be present. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art.
The following examples are further illustrative in order to facilitate the understanding of the embodiments, and the present invention is not limited to the examples.
Example 1: a preparation method of aqueous polyvinylidene chloride single-component anti-rust primer comprises the following steps:
step 1, preparing raw materials according to the following components by weight:
60 parts of aqueous polyvinylidene chloride resin,
10 parts of iron oxide red, namely 10 parts of iron oxide red,
20 parts of talcum powder,
5 parts of mica powder, namely 5 parts of mica powder,
10 parts of a composite anti-rust pigment,
1.5 parts of wetting dispersant, namely,
1.5 parts of a surfactant, namely,
0.6 part of defoaming agent, 0.6 part of,
2 parts of an anti-flash rust agent,
1 part of a thickening agent, namely 1 part of,
and 2 parts of a cosolvent.
The composite antirust pigment is a mixture of superfine modified inorganic phosphate antirust pigment, organic antirust pigment and ion exchange antirust pigment.
The aqueous polyvinylidene chloride resin is one or a mixture of more of copolymers such as VDC (vinylidene chloride)/VC (vinyl chloride), VDC (vinylidene chloride)/AN (acrylonitrile) and VDC (vinylidene chloride)/MMA (acrylic acid).
The pigment and filler is a mixture of iron oxide red, iron oxide yellow, titanium dioxide, carbon black, superfine modified inorganic phosphate antirust pigment, organic antirust pigment, ion exchange antirust pigment, barium sulfate, talcum powder and mica powder.
The superfine modified inorganic phosphate antirust pigment, the organic antirust pigment and the ion exchange antirust pigment form the composite antirust pigment.
The auxiliary agent is a mixture of a wetting dispersant, a surfactant, a defoaming agent, an anti-flash rust agent and a thickening agent.
The wetting dispersant is one or the mixture of two of ammonium salt solution of acrylate copolymer and high molecular weight block copolymer solution containing pigment affinity group.
The surfactant is one or mixture of ethylene oxide copolymer and propylene oxide copolymer.
The defoaming agent is one or a mixture of mineral oil and siloxane.
The flash rust inhibitor is one or a mixture of sodium nitrite aqueous solution and organic amine aqueous solution.
The thickener is one or more of polyurethane, cellulose, bentonite, and gas phase silica.
The cosolvent is a mixture of ethylene glycol butyl ether, diethylene glycol butyl ether, propylene glycol methyl ether, dipropylene glycol butyl ether and alcohol ester twelve.
Step 2, preparing water slurry
Deionized water was added to the stainless steel vessel and the disperser was started to stir at low speed (300 and 500 rpm).
Step 3. mixing the materials
And (2) sequentially adding a wetting dispersant and a surfactant into the stainless steel container under the condition of low-speed stirring (300-.
Step 4. grinding the slurry
And grinding the dispersed slurry by a sand mill, and measuring the fineness of the slurry by a scraper fineness meter until the fineness is less than or equal to 60 mu m.
Step 5 paint preparation
And sequentially adding the aqueous polyvinylidene chloride resin, the cosolvent, the defoamer, the flash rust inhibitor and the thickener into the ground slurry under the condition of medium-speed stirring (500-800 rpm) and fully and uniformly stirring to obtain the aqueous polyvinylidene chloride single-component antirust primer.
Example 2:
the aqueous polyvinylidene chloride single-component anti-rust primer comprises the following components in parts by weight:
50 parts of aqueous polyvinylidene chloride resin,
10 parts of titanium dioxide, namely 10 parts of titanium dioxide,
15 parts of talcum powder, namely 15 parts of talcum powder,
5 parts of mica powder, namely 5 parts of mica powder,
8 parts of a composite anti-rust pigment,
0.1 part of carbon black, by weight,
1 part of wetting dispersant, namely 1 part of wetting dispersant,
2 parts of a surfactant, namely 2 parts of,
0.5 part of defoaming agent, 0.5 part of,
1.5 parts of an anti-flash rust agent,
0.7 part of a thickening agent, namely,
and 1.5 parts of cosolvent.
The preparation method of the aqueous polyvinylidene chloride single component anti-rust primer is the same as that in the example 1 by changing the mass part ratio.
Example 3:
the aqueous polyvinylidene chloride single-component anti-rust primer comprises the following components in parts by weight:
50 parts of aqueous polyvinylidene chloride resin,
10 parts of iron oxide yellow, namely iron oxide yellow,
15 parts of talcum powder, namely 15 parts of talcum powder,
5 parts of mica powder, namely 5 parts of mica powder,
8 parts of a composite anti-rust pigment,
1 part of wetting dispersant, namely 1 part of wetting dispersant,
1 part of a surfactant, namely 1 part of,
0.5 part of defoaming agent, 0.5 part of,
1.5 parts of an anti-flash rust agent,
0.7 part of a thickening agent, namely,
and 1.5 parts of cosolvent.
The preparation method of the aqueous polyvinylidene chloride single component anti-rust primer is the same as that in the example 1 by changing the mass part ratio.
Example 4:
the aqueous polyvinylidene chloride single-component anti-rust primer comprises the following components in parts by weight:
40 parts of aqueous polyvinylidene chloride resin,
10 parts of iron oxide red, namely 10 parts of iron oxide red,
10 parts of talcum powder,
5 parts of mica powder, namely 5 parts of mica powder,
6 parts of a composite anti-rust pigment,
0.8 part of wetting dispersant, namely,
0.8 part of a surfactant, namely,
0.3 part of defoaming agent, 0.3 part of,
1 part of a flash rust inhibitor, namely,
0.5 part of a thickening agent, namely,
and 1 part of cosolvent.
The preparation method of the aqueous polyvinylidene chloride single component anti-rust primer is the same as that in the example 1 by changing the mass part ratio.
The products of examples 1-4 were individually tested for performance and the results are shown in the following table:
1. the fineness is required to be less than or equal to 60 mu m, GB/T1724-2019;
2. the adhesive force adopts a cross-check method, the requirement is less than or equal to level 1, GB/T9286-1998;
3. bending performance is required to be less than or equal to 2mm, GB/T6742-2007;
4. the water resistance requirements are that the surface of the coating film is not foamed, peeled, cracked and rusty spot, GB/T1733-1993;
5. the requirement of salt water resistance is that the surface of the coating film does not blister, peel off, crack or rust, GB/T9274-1988;
6. the salt fog resistance is required to be no bubbling, no peeling, no cracking and no rusty spot on the surface of a coating film, GB/T1771-2007;
7. the VOC content is required to be less than or equal to 10g/L, GB/T23985-one 2009.
8. The composite antirust pigment is a mixture of superfine modified inorganic phosphate antirust pigment, organic antirust pigment and ion exchange antirust pigment.
As can be seen from the above table, the aqueous polyvinylidene chloride one-component rust inhibitive primer of the present invention has excellent performance, but when the resin content is too small, its corrosion inhibitive performance is lowered.
The invention develops the aqueous polyvinylidene chloride single-component anti-rust primer by adopting the aqueous polyvinylidene chloride resin, and the coating has extremely low VOC emission in the whole coating process and excellent anti-rust performance.
Polyvinylidene chloride, having the chemical formula:
the material is nontoxic, tasteless, powdery and widely applied. Polyvinylidene chloride contains two chlorine atoms in unit molecule, has strong electronegativity and is tightly combined with hydrogen atoms in other chains. In addition, the molecular structure of the material has good symmetry. The characteristics make the gaps among the molecules very small, the crystallinity is high, the molecules and the molecules can be well agglomerated together, the permeation of small molecular substances such as water, chloride ions and the like is prevented, and the barrier property is excellent. Polyvinylidene chloride, however, has poor stability at its softening temperature. Under high temperature conditions, the metal ions present therein accelerate the decomposition and aging thereof, and thus the practical application value of polyvinylidene chloride homopolymer is low. And the polyvinylidene chloride of product grade exists mainly in the form of copolymer, such as VDC/VC, VDC/AN, VDC/MMA and the like.
The polyvinylidene chloride emulsion is a product of polyvinylidene chloride material aquosity, and the polyvinylidene chloride emulsion resin adopted by the invention is a terpolymer of VC (vinyl chloride)/VDC (vinylidene chloride)/MMA (acrylic acid). Due to the special molecular structure, a compact paint film like a plastic film can be formed, the paint film has extremely low transmittance to water vapor, chloride ions, carbon dioxide and the like, has good adhesive force on various substrates, and has good flexibility.
In addition, the coating formula is added with an antirust pigment with excellent shielding property and an antirust pigment with excellent passivation effect, so that the final coating is endowed with excellent water resistance, salt water resistance and salt mist resistance.
The polyvinylidene chloride emulsion is hardly added with any solvent in the synthesis process, and the VOC content of the resin is almost zero. The film can be formed by only adding a very small amount of cosolvent in the formula of the coating, so that the prepared coating product has extremely low VOC content.
As described above, although the embodiments of the present invention have been described in detail, it will be apparent to those skilled in the art that many modifications are possible without substantially departing from the spirit and scope of the present invention. Therefore, such modifications are also all included in the scope of protection of the present invention.
Claims (2)
1. The aqueous polyvinylidene chloride single-component anti-rust primer is characterized by comprising the following components in parts by weight:
40 to 60 parts of aqueous polyvinylidene chloride resin,
20-50 parts of a pigment and a filler,
0.5 to 10 parts of an auxiliary agent,
1-2 parts of a cosolvent,
a proper amount of deionized water is added,
the aqueous polyvinylidene chloride resin is one or a mixture of more of VDC (vinylidene chloride)/VC (vinyl chloride), VDC (vinylidene chloride)/AN (acrylonitrile)/VDC (vinylidene chloride)/MMA (acrylic acid) copolymers,
the pigment and filler is a mixture of iron oxide red, iron oxide yellow, titanium dioxide, carbon black, superfine modified inorganic phosphate antirust pigment, organic antirust pigment, ion exchange antirust pigment, barium sulfate, talcum powder and mica powder,
the superfine modified inorganic phosphate antirust pigment, the organic antirust pigment and the ion exchange antirust pigment form the composite antirust pigment,
the composite antirust pigment is a mixture of superfine modified inorganic phosphate antirust pigment, organic antirust pigment and ion exchange antirust pigment,
the auxiliary agent is a mixture of a wetting dispersant, a surfactant, a defoaming agent, an anti-flash rust agent and a thickening agent,
the wetting dispersant is one or two of ammonium salt solution of acrylate copolymer and high molecular weight block copolymer solution containing pigment affinity group,
the surfactant is one or mixture of ethylene oxide copolymer and propylene oxide copolymer,
the defoaming agent is one or a mixture of mineral oil and siloxane,
the flash rust inhibitor is one or the mixture of sodium nitrite aqueous solution and organic amine aqueous solution,
the thickener is one or more of polyurethane, cellulose, bentonite, and gas-phase silica,
the cosolvent is a mixture of ethylene glycol butyl ether, diethylene glycol butyl ether, propylene glycol methyl ether, dipropylene glycol butyl ether and alcohol ester twelve.
2. A preparation method of aqueous polyvinylidene chloride single-component anti-rust primer is characterized by comprising the following steps:
step 1, preparing raw materials according to the following components by weight:
40-60 parts of aqueous polyvinylidene chloride resin;
20-50% of pigment and filler;
0.5-10% of an auxiliary agent;
1-2 parts of cosolvent;
a proper amount of deionized water is added,
the aqueous polyvinylidene chloride resin is one or a mixture of more of VDC (vinylidene chloride)/VC (vinyl chloride), VDC (vinylidene chloride)/AN (acrylonitrile)/VDC (vinylidene chloride)/MMA (acrylic acid) copolymers,
the pigment and filler is a mixture of iron oxide red, iron oxide yellow, titanium dioxide, carbon black, superfine modified inorganic phosphate antirust pigment, organic antirust pigment, ion exchange antirust pigment, barium sulfate, talcum powder and mica powder,
the superfine modified inorganic phosphate antirust pigment, the organic antirust pigment and the ion exchange antirust pigment form the composite antirust pigment,
the auxiliary agent is a mixture of a wetting dispersant, a surfactant, a defoaming agent, an anti-flash rust agent and a thickening agent,
the wetting dispersant is one or two of ammonium salt solution of acrylate copolymer and high molecular weight block copolymer solution containing pigment affinity group,
the surfactant is one or mixture of ethylene oxide copolymer and propylene oxide copolymer,
the defoaming agent is one or a mixture of mineral oil and siloxane,
the flash rust inhibitor is one or the mixture of sodium nitrite aqueous solution and organic amine aqueous solution,
the thickener is one or more of polyurethane, cellulose, bentonite, and gas-phase silica,
the cosolvent is a mixture of ethylene glycol butyl ether, diethylene glycol butyl ether, propylene glycol methyl ether, dipropylene glycol butyl ether and alcohol ester twelve;
step 2, preparing water slurry
Deionized water is added into a stainless steel container, a dispersion machine is started to stir at a low speed (300-500 rpm),
step 3. mixing the materials
Sequentially adding wetting dispersant and surfactant into the stainless steel container under the condition of low-speed stirring (300 plus 500 rpm), adding pigment and filler under the condition of medium-speed stirring (500 plus 800 rpm), increasing the rotating speed of a dispersion machine (800 plus 1000 rpm) when no powder floats on the surface of the slurry, enabling the slurry to form a vortex by taking an axis as the center, keeping for 15-30 min, fully wetting and dispersing the pigment and filler,
step 4. grinding the slurry
Grinding the dispersed slurry by a sand mill, measuring the fineness of the slurry by a scraper fineness meter until the fineness is less than or equal to 60 mu m,
step 5 paint preparation
And sequentially adding the aqueous polyvinylidene chloride resin, the cosolvent, the defoamer, the flash rust inhibitor and the thickener into the ground slurry under the condition of medium-speed stirring (500-800 rpm) and fully and uniformly stirring to obtain the aqueous polyvinylidene chloride single-component antirust primer.
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| CN115368790A (en) * | 2022-06-28 | 2022-11-22 | 湖南梓先新材料有限公司 | Primer-topcoat coating and preparation method thereof |
| CN115477874A (en) * | 2022-10-14 | 2022-12-16 | 北京汇聚和新材料有限公司 | Water-based antirust primer and preparation method thereof |
| CN115960527A (en) * | 2022-11-22 | 2023-04-14 | 南京长江涂料有限公司 | Quick-drying water-based heat-reflecting heat-insulating coating with long service life and preparation method thereof |
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| CN116463014A (en) * | 2023-03-23 | 2023-07-21 | 河北晨阳工贸集团有限公司 | Water-based rust-carrying rust-transferring paint and preparation method thereof |
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Application publication date: 20211210 |