Alcohol-base foundry coating of a kind of mica/montmorillonite Composite and preparation method thereof
Technical field
The present invention relates to cast paint field, be specifically related to alcohol-base foundry coating of a kind of mica/montmorillonite Composite and preparation method thereof.
Background technology
Cast paint refers to for being coated in die cavity or core surface, to change the casting auxiliary material of the performances such as its surperficial refractoriness, chemical stability, anti-metal erosion, anti-stick grittiness, the disperse system that it is made up of the material of multiple different in kind, its composition mainly comprises the compositions such as refractory material, suspending agent, carrier, binding agent and special additive.Require that coating has good processing performance, service behaviour, quality stability and applies reappearance when acting on foundry goods, can play heat insulation on the one hand, equalization temperature, exempt the object of the impingment corrosion of molten metal, the defect such as cracking, sand holes, white iron formation that can prevent cast product from causing because Local cooling is too fast on the other hand.Cast paint is of a great variety, substantially can be divided into two classes: water based paint and alcohol-base paint.Wherein alcohol-base paint is both curable through lighting after application, does not need to dry, and can shorten the production cycle, Simplified flowsheet, reduces drying plant investment, is be cast a kind of quick drying paint that boundary widely uses, has been widely used in the production of steel, iron, coloured foundry goods.
But alcohol-base foundry coating has many defects in prior art, such as: suspension stability is poor, in long-distance transport and deposit easy layering in process, resistance to elevated temperatures is poor, hardness is low, low, the anti-stick grittiness of poor chemical stability, anti-metal performance of flushing is weak, make alcohol-base foundry coating function singleness, cannot large-scale industrial production be met.
Summary of the invention
Object of the present invention is just to provide alcohol-base foundry coating of a kind of mica/montmorillonite Composite and preparation method thereof, to overcome the deficiencies in the prior art.
The object of the present invention is achieved like this:
A kind of alcohol-base foundry coating of mica/montmorillonite Composite, it is characterized in that, be made up of the raw material of following weight portion: mica 60-80, imvite 30-40, barium sulfate 1-3, calcium sulfate 1-2, melamine resin 2-4, γ-(2,3-glycidoxy) propyl trimethoxy silicane 0.3-0.5, antioxidant 711 0.1-0.3, sodium alginate 3-5, cow dung 17-19, silester 5-8, ethanol 45-60, auxiliary agent 3-7.
Described auxiliary agent is made up of following raw materials in part by weight: plant ash 15-17, graphite 85-100, ice crystal 20-25, cyclodextrin 1.4-3.6, natural coating agent which has to be dissolved in alcohol before use 2.4-3.8, ethanol 25-30, lithium bentonite 1-2, nanometer silicon carbide 0.7-1.3, brown iron oxide 2.1-3.6, nano-calcium carbonate 3-5, chitin 0.9-2.1, paper pulp 12-17, suitable quantity of water, its preparation method is by graphite, ice crystal is put into calcining furnace and calcine 2-3 hour at 550-680 DEG C, take out, the hydrochloric acid solution putting into 8-12% soaks 4-5 hour, filter and take out, use clear water cyclic washing, dry and pulverize, add water stirring pulping, simultaneously, add brown iron oxide, nano-calcium carbonate grinds, spraying dry obtains xeraphium, cyclodextrin, natural coating agent which has to be dissolved in alcohol before use are joined in ethanol and heat stirring and dissolving, adds plant ash, lithium bentonite, nanometer silicon carbide high-speed stirred 10-20 minute, until fineness reaches the lithium bentonite that less than 50 μm obtain modification, xeraphium, modification lithium bentonite, chitin, paper pulp are added suitable quantity of water grinding granulation, dries and get final product.
The preparation method of the alcohol-base foundry coating of described a kind of mica/montmorillonite Composite, is characterized in that comprising the following steps:
(1) put into retort calcination processing 3-4 hour at 450-550 DEG C after cow dung being dried, take out, the hydrochloric acid solution putting into 10-12% soaks 3-6 hour, filters and takes out, use clear water cyclic washing, dries and pulverizes, the cow dung of obtained modification;
(2) modification cow dung above-mentioned steps obtained is stirred pulping and is heated to 140-160 DEG C together with the ethanol of imvite, 1/4 weight, add melamine resin, γ-(2,3-glycidoxy) propyl trimethoxy silicane maintenance temperature stirring 1-2 hour, be cooled to 50-60 DEG C and add barium sulfate, calcium sulfate grinding 30-40 minute;
(3) mica is pulverized in input reactor, add the ethanol agitation grinding 10-15 minute of silester and surplus, add step (2) product, sodium alginate, antioxidant 711, auxiliary agent again, temperature of reaction kettle is slowly risen to 75-85 DEG C simultaneously, keep temperature to stir 20-40 minute, grinding is until fineness reaches less than 50 μm.
The present invention has following beneficial effect: raw material of the present invention is simply pollution-free, simple process convenient operation, and obtained coating has good suspension and elevated temperature strength.
Detailed description of the invention
The alcohol-base foundry coating of described a kind of mica/montmorillonite Composite, it is characterized in that, be made up of the raw material of following weight portion: mica 68, imvite 30, barium sulfate 1, calcium sulfate 1, melamine resin 4, γ-(2,3-glycidoxy) propyl trimethoxy silicane 0.35, antioxidant 711 0.3, sodium alginate 5, cow dung 17, silester 5, ethanol 45, auxiliary agent 7.
Described auxiliary agent is made up of following raw materials in part by weight: plant ash 17, graphite 89, ice crystal 22, cyclodextrin 1.6, natural coating agent which has to be dissolved in alcohol before use 2.4, ethanol 25, lithium bentonite 1, nanometer silicon carbide 0.8, brown iron oxide 2.5, nano-calcium carbonate 3, chitin 0.9, paper pulp 12, suitable quantity of water, its preparation method is by graphite, ice crystal is put into calcining furnace and calcine 2-3 hour at 550-680 DEG C, take out, the hydrochloric acid solution putting into 8-12% soaks 4-5 hour, filter and take out, use clear water cyclic washing, dry and pulverize, add water stirring pulping, simultaneously, add brown iron oxide, nano-calcium carbonate grinds, spraying dry obtains xeraphium, cyclodextrin, natural coating agent which has to be dissolved in alcohol before use are joined in ethanol and heat stirring and dissolving, adds plant ash, lithium bentonite, nanometer silicon carbide high-speed stirred 10-20 minute, until fineness reaches the lithium bentonite that less than 50 μm obtain modification, xeraphium, modification lithium bentonite, chitin, paper pulp are added suitable quantity of water grinding granulation, dries and get final product.
Preparation method comprises the following steps:
(1) put into retort calcination processing 3-4 hour at 450-550 DEG C after cow dung being dried, take out, the hydrochloric acid solution putting into 10-12% soaks 3-6 hour, filters and takes out, use clear water cyclic washing, dries and pulverizes, the cow dung of obtained modification;
(2) modification cow dung above-mentioned steps obtained is stirred pulping and is heated to 140-160 DEG C together with the ethanol of imvite, 1/4 weight, add melamine resin, γ-(2,3-glycidoxy) propyl trimethoxy silicane maintenance temperature stirring 1-2 hour, be cooled to 50-60 DEG C and add barium sulfate, calcium sulfate grinding 30-40 minute;
(3) mica is pulverized in input reactor, add the ethanol agitation grinding 10-15 minute of silester and surplus, add step (2) product, sodium alginate, antioxidant 711, auxiliary agent again, temperature of reaction kettle is slowly risen to 75-85 DEG C simultaneously, keep temperature to stir 20-40 minute, grinding is until fineness reaches less than 50 μm.
The technical indicator of being processed the cast paint obtained by above-described embodiment is as follows:
(1) gas forming amount: 12 mL/g;
(2) 24 hours coating suspension rates are placed: 98.6%;
(3) intensity of paint coatings after 1200 DEG C of roastings: 710g/mm.