CN102173837B - Lubricating coating of high-temperature oxidation resistant sliding plate and preparation process thereof - Google Patents
Lubricating coating of high-temperature oxidation resistant sliding plate and preparation process thereof Download PDFInfo
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- CN102173837B CN102173837B CN 201110030089 CN201110030089A CN102173837B CN 102173837 B CN102173837 B CN 102173837B CN 201110030089 CN201110030089 CN 201110030089 CN 201110030089 A CN201110030089 A CN 201110030089A CN 102173837 B CN102173837 B CN 102173837B
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Abstract
The invention relates to a lubricating coating of a high-temperature oxidation resistant sliding plate and a preparation process thereof. The preparation process comprises the following steps of: (1) preparing a pre-mixing liquid: adding 5-10 parts by weight of polyvinyl alcohol to 90-95 parts by weight of hot water, stirring for 1-2 hours under the conditions that the temperature of hot water is kept between 80 DEG C and 100 DEG C and stirring speed is 100-200 revolutions/minute so that the polyvinyl alcohol is sufficiently dissolved; then cooling to room temperature to obtain a polyvinyl alcohol water solution; adding the following materials in parts by weight: 0.5-1 parts of bentonite, 10-20 parts of silica sols, 0.1-0.5 part of Tween 80 and 0.1-0.5 part of antiseptics to the polyvinyl alcohol water solution, and stirring for 1-2 hours under the condition that the stirring speed is 100-200 revolutions/minute to obtain the pre-mixing liquid; and (2) adding the pre-mixing liquid, 2-10 parts by weight of composite antioxidants and 25-35 parts by weight of crystalline flake graphite to a stirring ball mill for ball-milling mixing, and discharging to obtain the lubricating coating of the high-temperature oxidation resistant sliding plate. The invention enhances the dispersibility of graphite in water and ensures the long-term uniform stability of the property of the lubricating coating.
Description
Technical field
The present invention relates to a kind of slide gate nozzle slide board lubricating coating, especially a kind of water-based paint that improves the lubricated and high-temperature oxidation resistance of sled surface belongs to the slip coating field.
Background technology
Slide gate nozzle is a vitals of steel-making continuous casting equipment, its performance quality will directly have influence on control, the casting cycle of molten steel flow in casting process bleed-out situation, continuously cast bloom quality and to pollution of molten steel etc., thereby, the Performance and quality of slide gate nozzle has been proposed more and more higher technical requirements.
Slide plate is the member of most critical in each fire retarding component of slide gate nozzle, and this is to be determined by its special working conditions.Specifically have: (1) needs to contact with high-temperature molten steel for a long time; (2) under the condition that satisfies different casting process requirements, need repeatedly stand chemical erosion and the physical erosion of molten steel; (3) mechanical wear in the time of need bearing the violent thermal shocking of high-temperature molten steel and switching between slide plate etc.The slide unit that slide plate is controlled as molten steel flow in slide gate nozzle, after watering time use more, because the frequent friction of contact surface will bring inevitably that sled surface is pulled, fluffing and ligulate district adhere to the phenomenons such as molten steel, thereby increased the friction of slide plate slides, the damaged integrity of sled surface tight zone has reduced degree of flexibility and the corrosion resistance thereof of slide plate slides.Simultaneously, the increase of slide plate contact surface friction will affect the degree of flexibility of its slip and the accuracy that molten steel flow is controlled.Slide board lubricating coating is exactly under this background that the requirement of slide plate is improved constantly, and takes the lead in being developed and being developed by the scholar of Japan, is applied to the product innovation of slide plate high temperature lubricating aspect.Slide board lubricating coating not only can reduce the frictional coefficient between slide plate, also can especially play the effect of oxidation protection to the slide plate of aluminium carbonaceous to slide plate, thereby increases the work-ing life of slide plate.
In actual use, because the slide plate slip coating inevitably contacts with air, and the graphite in coating at high temperature is easy to occur oxidation consumption, so just reduced the working life of coating, simultaneously because the consumption of coating has also been accelerated molten steel and slag for the erosion at the slide plate mouth of a river.Therefore, improving the antioxidant property of the slide board lubricating coating take graphite as main component, is to guarantee the slide plate key in work-ing life.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of lubricating coating of high-temperature oxidation resistant sliding plate and preparation technology thereof are provided, the oilness when having increased slide plate slides and high temperature oxidation resistance, use properties and the life-span of improving slide plate.
According to technical scheme provided by the invention, described lubricating coating of high-temperature oxidation resistant sliding plate, its component ratio is counted by weight, comprises following component: 5～10 parts of polyvinyl alcohol, 90～95 parts, water, 0.5～1 part of wilkinite, 10～20 parts of silicon sol, 0.1～0.5 part of tween, 0.1～0.5 part of sanitas, 2～10 parts of compound antioxidizers, 25～35 parts of crystalline flake graphites.
Described compound antioxidizer comprises 10～20 parts of α-aluminum oxides, 20～40 parts of hexagonal boron nitrides, 10～20 parts of silicon carbide and 20～60 parts of silica flours; The granularity of described α-aluminum oxide is 0.5～1 μ m; The granularity of described hexagonal boron nitride is 0.5～1 μ m; The granularity of described silicon carbide and silica flour is 1～5 μ m.
When making compound antioxidizer: 10～20 parts of α-aluminum oxides, 20～40 parts of hexagonal boron nitrides, 10～20 parts of silicon carbide and 20～60 parts of silica flours are put into the roller milling machine, be dry mixed take zirconium oxide balls as grinding medium, Ball-milling Time is 12～24 hours, the ceramic powder that is mixed to get is crossed 325～600 mesh sieves, and the hybrid ceramic powder that obtains after sieving is compound antioxidizer.
The mean particle size of described crystalline flake graphite is 1～2 μ m, carbon content 〉=99%.Described wilkinite is lithium bentonite, and mean particle size is 200～325 orders.The pH value of described silicon sol is 9～10, and wherein dioxide-containing silica is 29～31wt%, and density is 1.20～1.22g/cm
3Described sanitas is Sodium Benzoate.Described tween is tween 80.
The preparation technology of described lubricating coating of high-temperature oxidation resistant sliding plate comprises following processing step:
(1) preparation pre-mixing liquor: 5～10 parts of polyvinyl alcohol are joined in the hot water of 90～95 parts, the temperature of hot water remains on 80～100 ℃, low whipping speed is to stir under the condition of 100～200 rev/mins polyvinyl alcohol fully to be dissolved in 1～2 hour, be cooled to again room temperature, obtain polyvinyl alcohol water solution; Add 0.5～1 part of wilkinite, 10～20 parts of silicon sol in polyvinyl alcohol water solution, 0.1～0.5 part of tween 80,0.1～0.5 portion of sanitas, low whipping speed are to stir under the condition of 100～200 rev/mins to obtain pre-mixing liquor in 1～2 hour;
(2) pre-mixing liquor, the compound antioxidizer of 2～10 parts and the crystalline flake graphite of 25～35 parts are added in agitating ball mill, carry out ball milling and mixed 12～24 hours, discharging namely obtains described lubricating coating of high-temperature oxidation resistant sliding plate.
The present invention has following advantage:
1, slide board lubricating coating of the present invention adopts that carbon content is high, ultra-fine crystalline graphite powder that mean particle size is 2 μ m is main raw material, take tween 80 as dispersion agent, can guarantee that the graphite granule surface is infiltrated well by water, has improved the dispersiveness of graphite in water; Simultaneously under the effect of lithium bentonite, graphite granule is suspended in for a long time in coating and layering or sedimentation does not occur, and has guaranteed the long-term stable homogeneous of the performance of coating;
2, slide board lubricating coating of the present invention, rate of drying is fast at normal temperatures, and slip coating is evenly fine and close, and flat appearance is smooth, and also under hot conditions, high with the slide plate bonding strength, kept good lubricity, also can significantly prevent coal-tar middle oil the oozing out of limited slip plate;
3, the present invention adopts common ceramic raw material through the ball milling blend, prepared compound high-temp antioxidizing agent, given full play to ceramic composite powders anti-oxidant synergy at high temperature, effectively reduced slip coating oxidation loss at high temperature, the sliding number of times of company of slide plate has been reached 3～4 times, satisfied domestic slide plate at present to the requirement in work-ing life.
Embodiment
The invention will be further described below in conjunction with specific embodiment.
It is the silicon sol of Nalco1130 that silicon sol used in the present invention adopts the U.S. Nalco Chemical Co trade mark; The pH value of described silicon sol is 9～10, and wherein dioxide-containing silica is 29～31wt%, and density is 1.20～1.22g/cm
3Silicon sol used in the present invention can make slide plate slip coating and slide plate plate face at high temperature have certain bonding strength as high-temperature inorganic adhesive.
The mean particle size of crystalline flake graphite used in the present invention is 1～2 μ m; carbon content 〉=99%; it is the main component of and protection lubricated as slide board lubricating coating; has good self-lubricating property and to the nonwetting property of molten steel and slag; can effectively reduce the frictional coefficient between slide plate, prevent that molten steel and slag are to the infiltration of slide plate face.
Wilkinite used in the present invention is lithium bentonite, and mean particle size is that 200～325 orders have good swelling behavior in water, is the suspension stabilizer in coating.Lithium bentonite can form tridimensional network in water, graphite granule can be suspended in coating steadily in the long term.
Polyvinyl alcohol used in the present invention is organic high molecular compound, and outward appearance is white powdered granule, has water-solublely, is thickening material and the low temperature bonding agent in coating.Polyvinyl alcohol is compared with other macromolecular compound, in the situation that compatible with wilkinite, have the significant advantage of thickening effectiveness, simultaneously, its cohesive strength is high, has good suspension, quick-drying and brushability, therefore is more suitable for as the low temperature bonding agent in coating.
Tween 80 used in the present invention, outward appearance is light yellow thick liquid, is a kind of hydrophilic tensio-active agent, can effectively improve water to the wetting property on graphite granule surface, is conducive to the good distribution of graphite granule in water.
Sanitas used in the present invention is the Sodium Benzoate of food additive grade, can effectively suppress coating the growing of bacterium in depositing process, guarantees the shelf life of coating.
Compound antioxidizer used in the present invention is by the solid ceramic phosphor composing that contains aluminium, boron and silicon.The ceramic powder that wherein contains aluminium is preferentially selected the α high temperature alumina, and purity is greater than 99wt%, and size-grade distribution is 0.5～1 μ m; The ceramic powder of boracic is preferentially selected hexagonal boron nitride, and purity is greater than 99wt%, and size-grade distribution is 0.5～1 μ m; The siliceous preferred silicon carbide of solid ceramic powder or silica flour, purity are greater than 99wt%, and size-grade distribution is 1～5 μ m.In compound antioxidizer, each composition has anti-oxidation synergy: the interpolation of aluminum oxide can improve slide plate slip coating stability and compactness at high temperature, reduces oxygen to the passage of slip coating internal penetration; Hexagonal boron nitride, silicon carbide and the silica flour avidity with oxygen under hot conditions is larger than the avidity of carbon and oxygen; can preferentially capture oxygen makes autoxidation and carbon is shielded; the new phase volume ratio original volume that generates after the oxidation inhibitor oxidation simultaneously is large; help to block the inside diffusion admittance of oxygen in slip coating; increase density, form the oxidation resistant barrier of sled surface.Simultaneously, hexagonal boron nitride also has the laminate structure of similar crystalline flake graphite, its self-lubricating property and anti-molten steel and slag corrosion excellent property, even therefore oxidation consumption has to a certain degree occured the graphite in slip coating, the existence of hexagonal boron nitride can guarantee that still slide plate has certain lubricity.
Embodiment one: a kind of preparation technology of lubricating coating of high-temperature oxidation resistant sliding plate comprises following processing step:
(1) preparation pre-mixing liquor: 5 kilograms of polyvinyl alcohol are joined in the hot water of 95 kilograms, the temperature of hot water remains on 80～100 ℃, low whipping speed is to stir under the condition of 200 rev/mins polyvinyl alcohol fully to be dissolved in 1 hour, then is cooled to room temperature, obtains polyvinyl alcohol water solution; Add 1 kilogram of lithium bentonite, 10 kilograms of silicon sol in polyvinyl alcohol water solution, 0.5 kilogram of tween 80,0.5 kilogram of preservative sodium benzoate, low whipping speed are to stir under the condition of 200 rev/mins to obtain pre-mixing liquor in 1 hour;
(2) preparation compound antioxidizer: 10 kilograms of α-aluminum oxides, 20 kilograms of part hexagonal boron nitrides, 10 kilograms of silicon carbide and 60 kilograms of silica flours are put into the roller milling machine, be dry mixed take zirconium oxide balls as grinding medium, Ball-milling Time is 12 hours, the ceramic powder that is mixed to get is crossed 325 mesh sieves, and the hybrid ceramic powder that obtains after sieving is compound antioxidizer;
(2) pre-mixing liquor, the compound antioxidizer of 10 kilograms and the crystalline flake graphite of 35 kilograms are added in agitating ball mill, carry out ball milling and mixed 12 hours, discharging namely obtains described lubricating coating of high-temperature oxidation resistant sliding plate.
Lubricating coating of high-temperature oxidation resistant sliding plate of the present invention is not found obvious sediment after 2 months standing, coating is uniform and stable, and the four glasss of values that are coated with of coating are 32 seconds, brush and flow leveling good, can cover the defectives such as pit of sled surface fully.Through carried out the 150 inferior commerical tests of cover on the slide plate working face of the large water-coating port of steelworks, the sliding number of times that on average connects of slide plate is 3.6 times/sets, after test, sled surface still leaves fine and close slip coating, coatingsurface is smooth, without scratching vestige, the slide plate section is not found the oxidative phenomena of carbon element near the place of coating.
Embodiment two: a kind of preparation technology of lubricating coating of high-temperature oxidation resistant sliding plate comprises following processing step:
(1) preparation pre-mixing liquor: 7.5 kilograms of polyvinyl alcohol are joined in the hot water of 92.5 kilograms, the temperature of hot water remains on 80～100 ℃, low whipping speed is to stir under the condition of 100 rev/mins polyvinyl alcohol fully to be dissolved in 2 hours, then is cooled to room temperature, obtains polyvinyl alcohol water solution; Add 0.75 kilogram of lithium bentonite, 15 kilograms of silicon sol in polyvinyl alcohol water solution, 0.25 kilogram of tween 80,0.25 kilogram of preservative sodium benzoate, low whipping speed are to stir under the condition of 100 rev/mins to obtain pre-mixing liquor in 2 hours;
(2) preparation compound antioxidizer: 15 kilograms of α-aluminum oxides, 30 kilograms of part hexagonal boron nitrides, 15 kilograms of silicon carbide and 40 kilograms of silica flours are put into the roller milling machine, be dry mixed take zirconium oxide balls as grinding medium, Ball-milling Time is 24 hours, the ceramic powder that is mixed to get is crossed 350 mesh sieves, and the hybrid ceramic powder that obtains after sieving is compound antioxidizer;
(2) pre-mixing liquor, the compound antioxidizer of 6 kilograms and the crystalline flake graphite of 30 kilograms are added in agitating ball mill, carry out ball milling and mixed 24 hours, discharging namely obtains described lubricating coating of high-temperature oxidation resistant sliding plate.
Lubricating coating of high-temperature oxidation resistant sliding plate of the present invention is not found obvious sediment after 2 months standing, coating is uniform and stable, and the four glasss of values that are coated with of coating are 28 seconds, brush and flow leveling good, can cover the defectives such as pit of sled surface fully.Through carried out the 150 inferior commerical tests of cover on the slide plate working face of the large water-coating port of steelworks, the sliding number of times that on average connects of slide plate is 4 times/sets, after test, sled surface still leaves fine and close slip coating, coatingsurface is smooth, without scratching vestige, the slide plate section is not found the oxidative phenomena of carbon element near the place of coating.
Embodiment three: a kind of preparation technology of lubricating coating of high-temperature oxidation resistant sliding plate comprises following processing step:
(1) preparation pre-mixing liquor: 10 kilograms of polyvinyl alcohol are joined in the hot water of 90 kilograms, the temperature of hot water remains on 80～100 ℃, low whipping speed is to stir under the condition of 150 rev/mins polyvinyl alcohol fully to be dissolved in 1.5 hours, then is cooled to room temperature, obtains polyvinyl alcohol water solution; Add 0.5 kilogram of lithium bentonite, 20 kilograms of silicon sol in polyvinyl alcohol water solution, 0.1 kilogram of tween 80,0.1 kilogram of preservative sodium benzoate, low whipping speed are to stir under the condition of 150 rev/mins to obtain pre-mixing liquor in 1.5 hours;
(2) preparation compound antioxidizer: 20 kilograms of α-aluminum oxides, 40 kilograms of part hexagonal boron nitrides, 20 kilograms of silicon carbide and 20 kilograms of silica flours are put into the roller milling machine, be dry mixed take zirconium oxide balls as grinding medium, Ball-milling Time is 18 hours, the ceramic powder that is mixed to get is crossed 500 mesh sieves, and the hybrid ceramic powder that obtains after sieving is compound antioxidizer;
(2) pre-mixing liquor, the compound antioxidizer of 2 kilograms and the crystalline flake graphite of 25 kilograms are added in agitating ball mill, carry out ball milling and mixed 18 hours, discharging namely obtains described lubricating coating of high-temperature oxidation resistant sliding plate.
Lubricating coating of high-temperature oxidation resistant sliding plate of the present invention is not found obvious sediment after 2 months standing, coating is uniform and stable, and the four glasss of values that are coated with of coating are 26 seconds, brush and flow leveling good, can cover the defectives such as pit of sled surface fully.Through carried out the 150 inferior commerical tests of cover on the slide plate working face of the large water-coating port of steelworks, the sliding number of times that on average connects of slide plate is 4 times/sets, after test, sled surface still leaves fine and close slip coating, coatingsurface is smooth, without scratching vestige, the slide plate section is not found the oxidative phenomena of carbon element near the place of coating.
Claims (2)
1. lubricating coating of high-temperature oxidation resistant sliding plate, it is characterized in that, its component ratio is counted by weight, comprises following component: 5 ~ 10 parts of polyvinyl alcohol, 90 ~ 95 parts, water, 0.5 ~ 1 part of wilkinite, 10 ~ 20 parts of silicon sol, 0.1 ~ 0.5 part of tween, 0.1 ~ 0.5 part of sanitas, 2 ~ 10 parts of compound antioxidizers, 25 ~ 35 parts of crystalline flake graphites;
Described compound antioxidizer comprises 10 ~ 20 parts of α-aluminum oxides, 20 ~ 40 parts of hexagonal boron nitrides, 10 ~ 20 parts of silicon carbide and 20 ~ 60 parts of silica flours; The granularity of described α-aluminum oxide is 0.5 ~ 1 μ m; The granularity of described hexagonal boron nitride is 0.5 ~ 1 μ m; The granularity of described silicon carbide and silica flour is 1 ~ 5 μ m;
When making compound antioxidizer: 10 ~ 20 parts of α-aluminum oxides, 20 ~ 40 parts of hexagonal boron nitrides, 10 ~ 20 parts of silicon carbide and 20 ~ 60 parts of silica flours are put into the roller milling machine, be dry mixed take zirconium oxide balls as grinding medium, Ball-milling Time is 12 ~ 24 hours, the ceramic powder that is mixed to get is crossed 325 ~ 600 mesh sieves, and the hybrid ceramic powder that obtains after sieving is compound antioxidizer;
The mean particle size of described crystalline flake graphite is 1 ~ 2 μ m, carbon content 〉=99%;
Described wilkinite is lithium bentonite, and mean particle size is 200 ~ 325 orders;
The pH value of described silicon sol is 9 ~ 10, and wherein dioxide-containing silica is 29 ~ 31wt%, and density is 1.20 ~ 1.22g/cm
3
Described sanitas is Sodium Benzoate;
Described tween is tween 80.
2. the preparation technology of a lubricating coating of high-temperature oxidation resistant sliding plate as claimed in claim 1, is characterized in that, its component ratio is counted by weight, comprises following processing step:
(1) preparation pre-mixing liquor: 5 ~ 10 parts of polyvinyl alcohol are joined in the hot water of 90 ~ 95 parts, the temperature of hot water remains on 80 ~ 100 ℃, low whipping speed is to stir under the condition of 100 ~ 200 rev/mins polyvinyl alcohol fully to be dissolved in 1 ~ 2 hour, then is cooled to room temperature, obtains polyvinyl alcohol water solution; Add 0.5 ~ 1 part of wilkinite, 10 ~ 20 parts of silicon sol in polyvinyl alcohol water solution, 0.1 ~ 0.5 part of tween 80,0.1 ~ 0.5 portion of sanitas, low whipping speed are to stir under the condition of 100 ~ 200 rev/mins to obtain pre-mixing liquor in 1 ~ 2 hour;
(2) pre-mixing liquor, the compound antioxidizer of 2 ~ 10 parts and the crystalline flake graphite of 25 ~ 35 parts are added in agitating ball mill, carry out ball milling and mixed 12 ~ 24 hours, discharging namely obtains described lubricating coating of high-temperature oxidation resistant sliding plate.
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| CN102660162B (en) * | 2012-05-10 | 2013-09-04 | 张家港拓普新材料科技有限公司 | Sliding plate protective coating for sliding water gap in steel-making continuous casting equipment |
| CN102674862B (en) * | 2012-05-25 | 2013-06-26 | 无锡市南方耐材有限公司 | High-temperature antioxidation antifriction lubricant and preparation method thereof |
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| CN103509641B (en) * | 2013-08-08 | 2015-11-18 | 张家港拓普新材料科技有限公司 | Hexagonal boron nitride base slide plate lubricant and preparation method thereof |
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| CN113185298B (en) * | 2021-04-16 | 2023-02-07 | 贵阳联合高温材料有限公司 | Microporous high-thermal-conductivity SiC-based connection and cladding lining product and preparation method and application thereof |
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