CN103264141B - Water-based casting zircon powder replacing coating and preparation method thereof - Google Patents
Water-based casting zircon powder replacing coating and preparation method thereof Download PDFInfo
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- CN103264141B CN103264141B CN201310208055.7A CN201310208055A CN103264141B CN 103264141 B CN103264141 B CN 103264141B CN 201310208055 A CN201310208055 A CN 201310208055A CN 103264141 B CN103264141 B CN 103264141B
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Abstract
The invention discloses a water-based casting zircon powder replacing coating. The water-based casting zircon powder replacing coating is characterized in that in a coating composition, water is used as carrier liquid, sodium bentonite is used as a suspending agent, a water-soluble phenolic resin is used as a bonding agent, and white fused alumina powder and andalusite powder are used as refractory aggregates, wherein the coating composition comprises the following components in percentage by weight: 20-30% of water, 2-4% of sodium bentonite, 0.2-1.0% of water-soluble phenolic resin, 15-55% of white fused alumina powder and 15-55% of andalusite. Compared with a water-based cast steel zircon powder coating which is commonly used on the market, the water-based casting zircon powder replacing coating has better thixotropic property and leveling property, is bright, clean and compact in coating, and has enough normal-temperature and high-temperature strength to ensure that the roughness of a cast meet the quality requirement.
Description
Technical field
The invention belongs to foundry facing and synthesis technology field thereof, be specifically related to a kind of water base casting zirconium English powder and substitute coating and preparation method thereof.
Background technology
The chemical composition of zirconium English powder is ZrO
2> 65%, SiO
2< 33%, TiO
2< 0.4%, Fe
2o
3< 0.5%, P
2o
5< 0.5%, Al
2o
3< 0.3%; Its granularity: 95% crosses 320 orders, and all the other cross 260 orders.Require refractoriness: be not less than 1550 DEG C; Gross activity specific activity is not more than 2*10
-6cikg
-1; Be usually used in the mold wash in model casting industry and Tao Xin.Zirconium English powder both as material of main part, also for glazing, makes the ware made increase wearability and surface smoothness in ceramic industry.Zirconium English powder has special purposes in much chemical industry, comprises cosmetics, cement, food antiseptic, process hides, fiber (for the manufacture of fire resistance fibre).
Casting zircon flour coating is the first-selected coating of cast steel in casting industry always.Zirconium English powder, because its linear expansion coefficient is little, good thermal shock stability, refractoriness are high and do not chemically react to most alloy when high temperature, so be a kind of good refractory material, is commonly used to the coating aggregate of stainless steel, high-alloy steel castings production.
But zirconium English powder source is comparatively complicated in recent years, and domestic and international market supply-demand relationship generation marked change, causes zirconium English powder price one tunnel high.In addition, the zirconium English powder of domestic processing mostly generally is raymond mill grinding, and impurity content is higher, and radioactivity is comparatively large simultaneously, easily damages the health of plant personnel.Steel moulder's paint on existing market, except zircon flour coating, also have high-alumina coating, chromite ore fine coating etc., but these coating high-temperature stabilities is poor, are difficult to reach cast steel requirement.The present invention therefore.
Summary of the invention
The object of the invention is to provide a kind of novel water-based casting zirconium English powder to substitute coating, be that primary raw material substitutes zirconium English powder by white alundum powder and andalusite powder, it is good that the novel casting zirconium English powder obtained substitutes coating high-temperature stability, refractoriness is high, can use as the substitute of casting zircon flour coating, and prepare novel water-based casting zirconium English powder and substitute that the raw materials technology source of coating is wide, preparation technology is simple, with low cost.
In order to solve these problems of the prior art, technical scheme provided by the invention is:
A kind of water base casting zirconium English powder substitutes coating, and to it is characterized in that in described coating composition with water being carrier fluid, being suspending agent with sodium bentonite, take water soluble phenol resin as binding agent, with white alundum powder and andalusite powder for refractory aggregate; Described coating composition comprises with the weight percent meter of its component:
Water 20%-30%; Sodium bentonite 2%-4%; Water soluble phenol resin 0.2%-1.0%; White alundum powder 15%-55%; Andalusite powder 15%-55%.
Described coating composition is prepared as follows:
(1) be added to the water by sodium bentonite, dispersed with stirring obtains A.
(2) add in A by water soluble phenol resin, dispersed with stirring obtains B.
(3) white alundum powder, andalusite powder are added, namely dispersed with stirring evenly obtains water base casting zirconium English powder according to claim 1 and substitutes coating.
Preferably, the Sodium Benzoate accounting for coating gross weight 0.2%-0.5% and the octanol accounting for coating gross weight 0.2%-0.5% is also comprised with the weight percent meter of its component in described coating composition.
Preferably, in described coating composition, the granularity of white alundum powder, andalusite powder is less than 260 orders respectively.
Preferably, in described coating composition, the granularity of white alundum powder, andalusite powder is less than 320 orders respectively.
Preferably, in described coating composition, white alundum powder is 325 order white alundum powders, and described andalusite powder is 325 order andalusite powder.
Another object of the present invention is to provide a kind of described water base casting zirconium English powder to substitute the preparation method of coating, it is characterized in that said method comprising the steps of:
(1) be added to the water by sodium bentonite, dispersed with stirring obtains A.
(2) add in A by water soluble phenol resin, dispersed with stirring obtains B.
(3) white alundum powder, andalusite powder are added, namely dispersed with stirring evenly obtains described water base casting zirconium English powder and substitutes coating.
Preferably, described method step adds in A at water soluble phenol resin in (2), adds Sodium Benzoate successively and octanol disperses after dispersed with stirring.
It is on the high side and have radioactive deficiency that the object of the invention is to overcome zirconium English powder, reasonably combined by white alundum powder and andalusite powder, be mixed with a kind of New-type cast steel coating, replace the expensive of present market use and active zirconium English powder, produce the New Type Water Base Coating for Steel Castings playing cast effect same with zircon flour coating on cast steel.
Andalusite is a kind of aluminium silicate mineral, and be a kind of natural ore, chemical formula is Al
2(SiO
4) O, crystal belongs to the nesosilicate mineral of tiltedly side's (orthogonal) crystallographic system, it is the raw mineral materials extracting aluminium, manufacture high-strength light alloy, high grade refractory, pottery, cable, mullite synthesizing etc., also be used as the raw material of jewel, Ornamental Stone and carving handicraft article, be common in the argillaceous rocks of contact aureole, be mainly formed at higher geothermal gradient, pressure with temperature than under low condition.White fused alumina is raw material with industrial alumina powder, cools and make in electric arc after more than 2000 degree high melts.White fused alumina is the one of manufactured abrasive.Alundum (Al2O3) (Al
2o
3) content more than 98%, and contains the compositions such as small amounts iron, silica, is white.
Simple use andalusite powder or white alundum powder use as zirconium English powder substitute, and result of use is bad, cannot be applied in foundry facing formula.Although it is good that its reason is andalusite sintering character, refractoriness is not high, though white alundum powder refractoriness is high, sintering character is bad.The bright New-type cast steel coating that technical solution of the present invention obtains adopts andalusite powder to combine with white alundum powder, gets its fire-resistant height and the good advantage of sintering character.
The preferred New-type cast steel water based paint of the present invention, primarily of carrier fluid, suspending agent, binding agent, refractory aggregate, anticorrisive agent, defoamer composition, its composition and proportioning are:
Carrier fluid: water 20%-30%;
Suspending agent: sodium bentonite 2%-4%;
Binding agent: water soluble phenol resin 0.2%-1.0%;
Refractory aggregate: 325 order white alundum powder 15%-55%; 325 order andalusite powder 15%-55%;
Anti-corrosive properties: Sodium Benzoate 0.2%-0.5%;
Defoamer: octanol 0.2%-0.5%.
Wherein sodium bentonite divides according to montmorillonite the exchangeable cationic type between layer kind, content: alkaline coefficient be more than or equal to 1 for sodium bentonite, be less than 1 be calcium-base bentonite.Artificial sodium bentonite differs due to sodium condition, and invalid temperature differs, but all lower than natural sodium bentonite; The expansive force of natural sodium bentonite is larger than artificial sodium bentonite; Natural sodium bentonite is higher than the artificial sodium bentonite c-axis degree of order, and crystal grain is comparatively thin, dispersed strong.Sodium bentonite than the physicochemical properties of calcium-base bentonite and process technology performance superior.Bentonite (Bentonite), be the moisture clay pit based on montmorillonite, public school's molecular formula is: Na
x(H
2o)
4(AI
2-xmg
0.83) Si
4o
10) (OH)
2, because it has special character.As: bloating tendency, caking property, adsorptivity, catalytic, thixotropy, suspension and cation exchange etc., so be widely used in each industrial circle.
Water soluble phenol resin is the new varieties developed in recent years, not only have that raw material is easy to get, cheap, production technology and the feature such as equipment is simple, and its product also has the plurality of advantages such as excellent mechanical property, heat resistance, cold resistance, electrical insulating property, dimensional stability, molding processibility, thus water soluble phenol resin has become one of indispensable material in each field, water soluble phenol resin can be used as gel cross-linkage agent and cotton plate, pipe, watt and the adhesive of the goods such as mineral wool abatvoix.The water soluble phenol resin that the present invention selects is B410.
The preparing process of preferred New-type cast steel water based paint comprises the following steps:
(1) sodium bentonite is added to the water, high speed dispersion 10 minutes.
(2) water soluble phenol resin, Sodium Benzoate, octanol are added successively, high speed dispersion 10 minutes.
(3) 325 order white alundum powders, 325 order andalusite powder are added, high speed dispersion 30 minutes.
Relative to scheme of the prior art, advantage of the present invention is:
Water base paint for steel casting of the present invention, the water base cast steel zircon flour coating cost comparatively now generally used declines to a great extent, and white alundum powder and andalusite powder "dead", to employee's health without any injury.
The water base cast steel zircon flour coating that the more present market of the New Type Water Base Coating for Steel Castings made according to present invention process generally uses has better thixotropy and levelability (Φ 6 viscosimeter be detected as 7-12 second), the bright and clean densification of coating (I grade), there are enough normal temperature and elevated temperature strength (0.20g/64 turns), make foundry goods roughness reach quality requirement (I grade).This New Type Water Base Coating for Steel Castings gas forming amount low (16.2ml/g), has adequate shielding, can obviously reduce bleb defect.After using this New Type Water Base Coating for Steel Castings, coating and foundry goods are peeled off automatically, can reduce casting cleaning workload.
Detailed description of the invention
Below in conjunction with specific embodiment, such scheme is described further.Should be understood that these embodiments are not limited to for illustration of the present invention limit the scope of the invention.The implementation condition adopted in embodiment can do further adjustment according to the condition of concrete producer, and not marked implementation condition is generally the condition in normal experiment.
Comparative example
The existing typical zircon flour coating composition in market
Compound method is as follows:
(1) sodium bentonite is added to the water, high speed dispersion 10 minutes.
(2) water soluble phenol resin, Sodium Benzoate, octanol are added successively, high speed dispersion 10 minutes.
(3) 325 order zirconium English powder are added, high speed dispersion 30 minutes.
Most of cast steel zircon flour coating is expensive and have radioactivity in the market.
Embodiment 1 water base casting zirconium English powder substitutes the preparation of coating
Compound method is as follows:
(1) sodium bentonite is added to the water, high speed dispersion 10 minutes.
(2) water soluble phenol resin, Sodium Benzoate, octanol are added successively, high speed dispersion 10 minutes.
(3) 325 order white alundum powders, 325 order andalusite powder are added, high speed dispersion 30 minutes.
Most of cast steel zircon flour coating is expensive and have radioactivity in the market.
This New Type Water Base Coating for Steel Castings is with low cost, "dead", and have good mobile performance and good sintering stripping performance, steel casting surface quality improves greatly.
Embodiment 2 New Type Water Base Coating for Steel Castings composition: water 28%, sodium bentonite 2.5%, water soluble phenol resin 1.0%, Sodium Benzoate 0.25%, octanol 0.25%, 325 order white alundum powder 45%, 325 order andalusite powder 33%.
This New Type Water Base Coating for Steel Castings is with low cost, "dead", and have good mobile performance and good sintering stripping performance, steel casting surface quality improves greatly.
Embodiment 3 New Type Water Base Coating for Steel Castings composition: water 30%, sodium bentonite 3.0%, water soluble phenol resin 0.7%, Sodium Benzoate 0.35%, octanol 0.35%, 325 order white alundum powder 40%, 325 order andalusite powder 25.6%.
This New Type Water Base Coating for Steel Castings is with low cost, "dead", and have good mobile performance and good sintering stripping performance, steel casting surface quality improves greatly.
Above-mentioned example, only for technical conceive of the present invention and feature are described, its object is to person skilled in the art can be understood content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalent transformations of doing according to Spirit Essence of the present invention or modification, all should be encompassed within protection scope of the present invention.
Claims (7)
1. water base casting zirconium English powder substitutes a coating, and to it is characterized in that in described coating composition with water being carrier fluid, being suspending agent with sodium bentonite, take water soluble phenol resin as binding agent, with white alundum powder and andalusite powder for refractory aggregate; Described coating composition comprises with the weight percent meter of its component:
Water 20%-30%; Sodium bentonite 2%-4%; Water soluble phenol resin 0.2%-1.0%; White alundum powder 15%-55%; Andalusite powder 15%-55%.
2. water base casting zirconium English powder according to claim 1 substitutes coating, it is characterized in that also comprising the Sodium Benzoate accounting for coating gross weight 0.2%-0.5% and the octanol accounting for coating gross weight 0.2%-0.5% with the weight percent meter of its component in described coating composition.
3. water base casting zirconium English powder according to claim 1 substitutes coating, it is characterized in that white alundum powder in described coating composition, the granularity of andalusite powder is less than 260 orders respectively.
4. water base casting zirconium English powder according to claim 1 substitutes coating, it is characterized in that white alundum powder in described coating composition, the granularity of andalusite powder is less than 320 orders respectively.
5. water base casting zirconium English powder according to claim 1 substitutes coating, and it is characterized in that in described coating composition, white alundum powder is 325 order white alundum powders, described andalusite powder is 325 order andalusite powder.
6. water base casting zirconium English powder according to claim 1 substitutes a preparation method for coating, it is characterized in that said method comprising the steps of:
(1) be added to the water by sodium bentonite, dispersed with stirring obtains A;
(2) add in A by water soluble phenol resin, dispersed with stirring obtains B;
(3) white alundum powder, andalusite powder are added, namely dispersed with stirring evenly obtains water base casting zirconium English powder according to claim 1 and substitutes coating.
7. method according to claim 6, is characterized in that adding in A at water soluble phenol resin in described method step (2), adds Sodium Benzoate successively and octanol disperses after dispersed with stirring.
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