CN105694554A - Industrial waterborne inorganic polyphosphoester anticorrosive coating and preparation method thereof - Google Patents
Industrial waterborne inorganic polyphosphoester anticorrosive coating and preparation method thereof Download PDFInfo
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Abstract
An industrial waterborne inorganic polyphosphoester anticorrosive coating and its preparation method. The coating is composed of the following ingredients (by weight): 36-41 parts of a potassium lithium silicate solution, 29-34 parts of an aqueous phosphate ester polymer, 10-20 parts of color paste, 0.5-0.8 part of an antifoaming agent, 0.8-1.0 part of a thickening agent and 8.5-18.4 parts of water. The preparation method comprises the following steps: adding the potassium lithium silicate solution according to the weight ratio into a container, stirring at 800-1000 r/min and adding the aqueous phosphate ester polymer, uniformly mixing, stirring at the stirring velocity of 400-600 r/min and adding the color paste, uniformly stirring, stirring at the stirring velocity of 300-500 r/min and adding water, the antifoaming agent and the thickening agent, aging for 20 min, and filtering through a screen mesh of 800-100 meshes. The coating of the invention belongs to a single-component self-dry coating. The film has characteristics of short surface drying time, fast solidification, excellent water resistance, good adhesion to steel, ageing resistance, self-rust conversion, corrosion resistance and the like.
Description
Technical field
The invention belongs to technical field of coatings, particularly a kind of industrial aqueous inorganic polyphosphate anticorrosive coating and preparation method。
Background technology
The harm that traditional solvent-borne coating produces at the volatile organic content (VOC) produced and discharge in use procedure, has shown greenhouse effect, has destroyed atmospheric ozone layer, has caused atmospheric pollution and the many aspects such as polluted water, soil。There are two big problems in producing and using in solvent based coating: one is the volatilization due to organic solvent, and environmental pollution is large in number and widely distributed, and wherein poisonous and harmful element directly affects health。Two is easily form significant safety hazards, because the general flash-point of organic solvent is relatively low, produce and in painting site air the solvent that volatilizees higher, pole fire hazardous or blast serious accident。Therefore the mankind and environment in use can be caused quite serious harm by solvent based coating。
Along with the scarcity of scientific and technological progress and rapid development of economy, resource and the energy has caused the attention of countries in the world, joint money is energy-conservation, protects environment, is the subject matter faced of world's coating interface。As the water paint of one of solvent based coating succedaneum, it is subject to the attention of countries in the world。In recent years in world's coating yield, aqueous industrial coating has accounted for more than 40% in world's industrial coating。Even if in special coating field, water paint also just permeates to fields such as automobile repairing paint, anticorrosive coating, paint for road mark with unprecedented speed。China begins one's study from the sixties in 20th century water paint, and after entering 21 century, country vigorously supports the development of water paint。Although existing market occupation rate is not as high, but annual rate of growth is then faster than other environment-friendly type coatings, becomes a kind of coating with broad mass market prospect。
Water paint is the coating with water as solvent or disperse medium。Resin is through the process of emulsifying agent and forms resin dispersion in water and scattered particle diameter and is called water emulsification coating at more than 0.1mm；Carry out the resin in retarder thinner with water and form the particle diameter of resin dispersion in water and dispersion and be called Water-dispersing coatings at 0.01～0.1mm；The amine salt solution of organic solvent forms the dispersion soln of polymer aggregation of quite stable and particle diameter after water dilutes and is called water soluble paint at below 0.1mm。
Watery anti-corrosion paint is broadly divided into two classes in the market:
One class includes, with resins such as water alcohol acid, epoxy, acrylic acid, polyurethane and polyester for film forming matter, adding various additive, makes such as cosolvent, emulsifying agent, coalescents, thickening agent, defoamer, drier, antimildew disinfectant, corrosion inhibiter etc.。The feature of this kind of coating is that coating surface drying time is long, and early stage resistance to water is poor, and antiseptic power is more weak, in steel anti-corrosive field, iron and steel plays light antiseptical effect。
Another kind of include with inorganic silicic acid saline solution, inorganic phosphate saline solution etc. for film forming matter, make with zinc powder collocation。
The feature of this kind of coating is that coating is more crisp, pliability is poor, but antiseptic power is strong, in steel anti-corrosive field, iron and steel plays the effect of heavy antisepsis。Zinc ore is non-renewable resource, along with constantly exploiting, it will change fewer and feweri。
Summary of the invention
It is an object of the invention to overcome the defect existed in prior art, it is provided that a kind of industrial aqueous inorganic polyphosphate anticorrosive coating and preparation method。The combination of aqueous phosphate ester polymer and Lithium metasilicate potassium solution adopts hydridization blending technology, belong to one pack system, air-dried coating, film has the features such as surface drying time is short, quick solidifying, resistance to water are good, ground adhesion is good, aging resistance, and it is the anticorrosive coating in steel anti-corrosive field with rotation rust, anticorrosion, environmentally friendly type。
For achieving the above object, present invention employs following technical scheme: this coating is one pack system, there is inorganic nature, rotation rust property, it is characterised in that: described component is made up of Lithium metasilicate potassium solution 36～41 weight portion, aqueous phosphate ester polymer 29～34 weight portion, mill base 10～20 weight portion, defoamer 0.5～0.8 weight portion, thickening agent 0.8～1.0 weight portion, water 8.5～18.4 weight portion。
Described Lithium metasilicate potassium solution, wherein silicon oxide is 18 with the modulus of the ratio of the molecule of lithium potassium oxide, and the weight ratio of lithium potassium is 1:39。
Described aqueous phosphate ester polymer is by, after acrylic emulsion 60～75 weight portion, the heated polyreaction of poly phosphate 10～30 weight portion, preparing after adding nertralizer (AMP-95) 0.5～5 weight portion, buffer agent sodium bicarbonate 1～3 weight portion and deionized water 10～30 weight portion。
Described mill base is iron oxide red or other color mill base (such as SM2844, SM2894 etc.)。
Described defoamer is the acrylic acid defoamer (such as H4211 etc.) of dilute with water 50%。
Described thickening agent is alkali swelling type thickening agent (such as TT-935 etc.) of dilute with water 50%。
Described water is deionized water。
The preparation method of industrial aqueous inorganic polyphosphate anticorrosive coating of the present invention is: by weight, Lithium metasilicate potassium solution is added in container, under 800～1000r/min stirs, add aqueous phosphate ester polymer, to be mixed uniformly, mill base is added under 400r/min～600r/min stir speed (S.S.), after mix homogeneously, water is added under 300r/min～500r/min stir speed (S.S.), defoamer and thickening agent, through 20min ripening, namely 80～100 eye mesh screens obtain industrial aqueous inorganic polyphosphate anticorrosive coating after filtering。
The film conventional performance index such as following table of gained coating。
| Drying time | Surface drying/min≤10；Do solid work/h≤1 |
| Impact resistance/kg cm | 50 |
| Adhesive force/level | 1 |
| Pliability/mm | 1～2 |
| Pencil hardness/H | 4 |
| Salt water resistance (3%NaCl solution) | 600h is without exception |
| Salt spray resistance (hour) | 220～300 h are without exception |
| Resistance to artificial accelerated aging (hour) | 1000h is without exception |
The industrial aqueous inorganic polyphosphate anticorrosive coating of the present invention, both there is the feature that aqueous inorganic silicate class coating film surface drying is fast, early stage resistance to water is good, there is again the pliability that water-base resin class anticorrosive coating is good, simultaneously it is using water as disperse medium, odorlessness, do not fire, not quick-fried, safety in storage, transport and use procedure is greatly improved, and construction tool available water is directly cleaned。
The present invention is raw materials used is the commercially available prod being prone to buy, and will not restrict the industrialized production of the industrial aqueous inorganic polyphosphate anticorrosive coating of the present invention。
The anticorrosion mechanism of coating of the present invention is as follows:
When coating be coated on iron-based or slightly get rusty Fe-based substrate surface time, one end poly phosphate group of numerous anchoring groups and base material Fe or and the main component Fe (OH) of rust in the aqueous phosphate ester polymer emulsified body used in coating2\Fe(OH)3、FeO\Fe2O3It is bonded formation chelate Deng iron ion in high stability chemical coordination key mode, completes the effect of rotation rust；Other end acrylic resin group aligns formation hydrophobic barrier when film forming。Meanwhile in coating there is complex reaction with Fe-based substrate surface in the silicate ion in Lithium metasilicate potassium solution, generates highly stable ferrosilite complex, reaches the purpose of anticorrosion of iron and steel。
Namely the present invention industrial aqueous inorganic polyphosphate anticorrosive coating is utilize above-mentioned mechanism, make to be coated on the poly phosphate group of steel surface, silicate ion and generate the passivation hydrophobic chelate of colloid and ferrosilite complex with ferrum or iron ion in film forming, solidification process, and form the polymer coating film of interpenetrating network with the high molecular polymer molecule in coating。After this film is fully cured, at steel surface, form fine and close protective layer, isolation aqueous vapor, oxygen and other corrosion factor, it is ensured that iron and steel is no longer influenced by further corrosion, thus reaching the purpose of anticorrosion of iron and steel。
Detailed description of the invention
The invention will be further described by the following examples。
Embodiment l:
Raw material is taken: Lithium metasilicate potassium solution 41 parts by following weight ratio；Aqueous phosphate ester polymer 29 parts；Mill base 20 parts；Defoamer 0.5 part；Thickening agent 1 part；8.5 parts of water。
The step of concrete preparation method is: by weight, Lithium metasilicate potassium solution is added in container, under 850r/min stirs, add aqueous phosphate ester polymer, to be mixed uniformly, under 500r/min stir speed (S.S.) add mill base, after mix homogeneously, water, defoamer and thickening agent is added under 300r/min stir speed (S.S.)。Through 20min ripening, namely 100 eye mesh screens obtain industrial aqueous inorganic polyphosphate anticorrosive coating after filtering。
This coating brushed or is sprayed on the tinplate sheet with the process of St2 standard, the film of surface drying, coating thickness 20～30 microns can be obtained in 10 minutes, after solidifying 24h, test film performance such as following table。
| Test event | Test result |
| Drying time | Surface drying/min≤10；Do solid work/h≤1 |
| Resistance to impact/kg cm | 50 |
| Adhesive force/level | 1 |
| Pliability/mm | 1 |
| Pencil hardness/H | 5 |
| Salt water resistance (3%NaCl) | 600h is without exception |
| Salt spray resistance | 220h is without exception |
| Resistance to artificial accelerated aging | 1000h is without exception |
Embodiment 2:
Raw material is taken: Lithium metasilicate potassium solution 38 parts by following weight ratio；Aqueous phosphate ester polymer 32 parts；Mill base 15 parts；Defoamer 0.6 part；Thickening agent 0.9 part；13.5 parts of water。
The step of concrete preparation method is: by weight, Lithium metasilicate potassium solution is added in container, under 900r/min stirs, add aqueous phosphate ester polymer, to be mixed uniformly, under 500r/minn stir speed (S.S.) add mill base, after mix homogeneously, water, defoamer and thickening agent is added under 400r/min stir speed (S.S.)。Through 20min ripening, namely 100 eye mesh screens obtain industrial aqueous inorganic polyphosphate anticorrosive coating after filtering。
This coating brushed or is sprayed on the tinplate sheet with the process of St2 standard, the film of surface drying, coating thickness 20～30 microns can be obtained in 10 minutes, after solidifying 24h, test film performance such as following table。
| Test event | Test result |
| Drying time | Surface drying/min≤10；Do solid work/h≤1 |
| Resistance to impact/kg cm | 50 |
| Adhesive force/level | 1 |
| Pliability/mm | 1 |
| Pencil hardness/H | 5 |
| Salt water resistance (3%NaCl) | 600h is without exception |
| Salt spray resistance | 240h is without exception |
| Resistance to artificial accelerated aging | 1000h is without exception |
Embodiment 3:
Raw material is taken: Lithium metasilicate potassium solution 36 parts by following weight ratio；Aqueous phosphate ester polymer 34 parts；Mill base 10 parts；Defoamer 0.8 part；Thickening agent 0.8 part；8.4 parts of water。
The step of concrete preparation method is: by weight, Lithium metasilicate potassium solution is added in container, under 1000r/min stirs, add aqueous phosphate ester polymer, to be mixed uniformly, under 600r/min stir speed (S.S.) add mill base, after mix homogeneously, water, defoamer and thickening agent is added under 500r/min stir speed (S.S.)。Through 20min ripening, namely 80 eye mesh screens obtain industrial aqueous inorganic polyphosphate anticorrosive coating after filtering。
This coating brushed or is sprayed on the tinplate sheet with the process of St2 standard, the film of surface drying, coating thickness 20～30 microns can be obtained in 10 minutes, after solidifying 24h, test film performance such as following table。
Embodiment 4:
Raw material is taken: Lithium metasilicate potassium solution 42 parts by following weight ratio；Aqueous phosphate ester polymer 28 parts；Mill base 20 parts；Defoamer 0.5 part；Thickening agent 1 part；8.5 parts of water。
The step of concrete preparation method is: by weight, Lithium metasilicate potassium solution is added in container, under 950r/min stirs, add aqueous phosphate ester polymer, to be mixed uniformly, under 550r/min stir speed (S.S.) add mill base, after mix homogeneously, water, defoamer and thickening agent is added under 300r/min stir speed (S.S.)。Through 20min ripening, namely 100 eye mesh screens obtain industrial aqueous inorganic polyphosphate anticorrosive coating after filtering。
This coating brushed or is sprayed on the tinplate sheet with the process of St2 standard, the film of surface drying, coating thickness 20～30 microns can be obtained in 10 minutes, after solidifying 24h, test film performance such as following table。
| Test event | Test result |
| Drying time | Surface drying/min≤10；Do solid work/h≤1 |
| Resistance to impact/kg cm | 30 |
| Adhesive force/level | 3 |
| Pliability/mm | 3 |
| Pencil hardness/H | 4 |
| Salt water resistance (3%NaCl) | 200h goes out a rust |
| Salt spray resistance | 50h goes out a rust |
Embodiment 5:
Raw material is taken: Lithium metasilicate potassium solution 34 parts by following weight ratio；Aqueous phosphate ester polymer 36 parts；Mill base 20 parts；Defoamer 0.5 part；Thickening agent 1 part；8.5 parts of water。
The step of concrete preparation method is: by weight, Lithium metasilicate potassium solution is added in container, under 700r/min stirs, add aqueous phosphate ester polymer, to be mixed uniformly, under 400r/min stir speed (S.S.) add mill base, after mix homogeneously, water, defoamer and thickening agent is added under 400r/min stir speed (S.S.)。Through 20min ripening, namely 100 eye mesh screens obtain industrial aqueous inorganic polyphosphate anticorrosive coating after filtering。
This coating brushed or is sprayed on the tinplate sheet with the process of St2 standard, the film of surface drying, coating thickness 20～30 microns can be obtained in 20 minutes, after solidifying 48h, test film performance such as following table。
| Test event | Test result |
| Drying time | Surface drying/min > 10；Do solid work/h≤2 |
| Resistance to impact/kg cm | 50 |
| Adhesive force/level | 1 |
| Pliability/mm | 1 |
| Pencil hardness/H | 1 |
| Salt water resistance (3%NaCl) | 300h goes out a rust |
| Salt spray resistance | 100h goes out a rust |
Described in summary embodiment, wherein Lithium metasilicate potassium solution (A) changes coating leading indicator performance impact such as following table of the present invention with aqueous phosphate ester polymer (B) ratio。
| A:B(weight ratio) | Salt spray resistance (hour) | Salt water resistance (hour) | Adhesive force (draws circle method) (level) | Hardness (H) | Pliability (mm) | Keeping quality (moon) | |
| Embodiment 1 | 41:29 | 220 | 600 | 1 | 5 | 1 | 6 |
| Embodiment 2 | 38:32 | 240 | 600 | 1 | 5 | 1 | 6 |
| Embodiment 3 | 36:34 | 300 | 600 | 1 | 4 | 1 | 6 |
| Embodiment 4 | 42:28 | 500 | 200 | 3 | 5 | 4 | 6 |
| Embodiment 5 | 34:36 | 100 | 300 | 1 | 1 | 1 | 1 |
Above test data shows:
If Lithium metasilicate potassium solution (A) in coating: when aqueous phosphate ester polymer (B) is more than 41:29, it will directly influence the adhesive force of film, pliability and corrosion resistance。
If Lithium metasilicate potassium solution (A) in coating: when aqueous phosphate ester polymer (B) is less than 34, it will directly influence the keeping quality of the surface drying speed of film, hardness, corrosion resistance and coating。
Above are only the comparative example of the present invention, be not used for limiting the practical range of the present invention。Namely all equivalences made according to the content of the present patent application the scope of the claims change and modify, and all should be the technology category of the present invention。
Claims (8)
1. an industrial aqueous inorganic polyphosphate anticorrosive coating, it is characterised in that described component and weight proportion be:
Lithium metasilicate potassium solution 36～41 weight portion
Aqueous phosphate ester polymer 29～34 weight portion
Mill base 10～20 weight portion
Defoamer 0.5～0.8 weight portion
Thickening agent 0.8～1.0 weight portion
Water 8.5～18.4 weight portion。
2. industrial aqueous inorganic polyphosphate anticorrosive coating according to claim 1, it is characterized in that: the described polymer that aqueous phosphate ester polymer is poly phosphate and acrylic emulsion, wherein main component acrylic emulsion 60～75 weight portion, poly phosphate 10～30 weight portion。
3. industrial aqueous inorganic polyphosphate anticorrosive coating according to claim 1, it is characterised in that: the modulus of described Lithium metasilicate potassium solution is 18。
4. industrial aqueous inorganic polyphosphate anticorrosive coating according to claim 3, it is characterised in that: in described Lithium metasilicate potassium solution, the weight ratio of lithium potassium is 1:39。
5. industrial aqueous inorganic polyphosphate anticorrosive coating according to claim 1, it is characterised in that: described defoamer is the acrylic acid defoamer of dilute with water 50%。
6. industrial aqueous inorganic polyphosphate anticorrosive coating according to claim 1, it is characterised in that: described thickening agent is the alkali swelling type thickening agent of dilute with water 50%。
7. industrial aqueous inorganic polyphosphate anticorrosive coating according to claim 1, it is characterised in that: described water is deionized water。
8. require the preparation method of a kind of industrial aqueous inorganic polyphosphate anticorrosive coating described in 1 according to profit, it is characterized in that: by weight, Lithium metasilicate potassium solution is added in container, under 800～1000r/min stirs, add aqueous phosphate ester polymer, to be mixed uniformly, color slurry is added under 400r/min～600r/min stir speed (S.S.), after mix homogeneously, water is added under 300r/min～500r/min stir speed (S.S.), defoamer and thickening agent, through 20min ripening, namely industrial aqueous inorganic polyphosphate anticorrosive coating is obtained after filtering with 80～100 eye mesh screens。
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