CN102000762B - A kind of composite dope layer process for large-scale steel-casting waterglass sand mold - Google Patents

Abstract

The invention discloses a kind of composite dope layer process for large-scale steel-casting waterglass sand mold, described coating divides three layers of brushing, and primer and the second layer are alcohol-base paint; Outermost aspect is water based paint; During use, three coatings control brushing by certain Baume degrees.This composite dope, primer is comparatively strong to the adhesive force of sand mold, and ensures the shielding properties of coating; Coating materials adopts zirconium English powder water based paint, both ensured and refractoriness enough during steel contacts, also can obtain than the better levelability of alcohol-base paint, surperficial fine and smooth degree, effectively improve the surface quality of foundry goods, make this dope layer have the combination property exceeding single coating.And composite dope layer process of the present invention makes the thickness of coating reduce about 20%, so the dimensional accuracy of foundry goods is obviously improved while the combination property reaching excellence.

Description

A kind of composite dope layer process for large-scale steel-casting waterglass sand mold

Technical field

The present invention relates to a kind of foundry facing technique, particularly relate to a kind of water-glass sand mold casting coating process.

Background technology

For the water virus sand mold of large-scale steel-casting, cast paint, as the founding materials of a kind of effective shielding molten steel, sand mold, needs enough aggregate refractoriness, smooth surface quality.Coating often needs could obtain enough coating layer thicknesses at least three times.For waterglass formative technology, use water based paint contacting first pass coating with sand mold, the moisture content of itself or the water based paint shielding action bad to moisture in air can produce harmful effect to sand mold intensity, produce bubble after also making dry paint layer.And for heavy castings, use the drying of water based paint to need the longer time, if all use water based paint, the progress of production certainly will be affected.If but all use alcohol-base paint, really on isolated moisture and drying, curing rate, than water based paint, there is clear superiority, but the sand mold of heavy castings all uses the mode of igniting, after all there is danger, and the surface quality of alcohol-base paint does not have water based paint fine and smooth, smooth, just causes its cast(ing) surface comparatively coarse yet.

A kind of technique is not still had to control the respective characteristic of reasonably comprehensive alcohol radical, water based paint by formula and state in prior art, mate the operational characteristic of large-scale steel-casting water-glass sand part again, improve the combination property of coating, enhance productivity, improve surface quality of continuous castings.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of for large-scale steel-casting waterglass sand mold, the better composite dope layer process of the combination property such as adaptability, adhesiveness.

For solving the problems of the technologies described above, technical scheme provided by the invention is as follows:

A kind of composite dope layer process for large-scale steel-casting waterglass sand mold:

Three layers of brushing are divided at the coating of described sand mold surface of internal cavity, primer is identical with second layer coating, and its each composition weight percentage composition is: zirconium English powder 70%, vinsol resin 0.3%, novolac resin 0.8%, lithium bentonite 1.5%, isopropyl alcohol 27.4%; Each composition weight percentage composition of outermost layer coating materials is: zirconium English powder 74%, vac-veova emulsion 2.2%, suspending agent 2.5%, association thickener 1.5%, and all the other components are water;

In casting mold cavity in brushing paint process, it is 65 ~ 75 ° of B é that primer controls Baume degrees when brushing, and with the industrial alcohol of content more than 99% adjustment Baume degrees, for large thick member capping, little thin pieces removes the limit;

It is 75 ~ 85 ° of B é that second layer coating controls Baume degrees when brushing, and with the industrial alcohol of content more than 99% adjustment Baume degrees, for large thick member capping, little thin pieces removes the limit;

Coating materials controls Baume degrees 70 ~ 75 ° of B é when brushing, with water adjustment Baume degrees, to ensure enough coating layer thicknesses, good brushing performance, fine and smooth face coat.

Composite dope layer of the present invention is: using Zircon powder alcohol group dope as the primer directly contacted with waterglass sand mold and second layer coating, because the adhesive force of alcohol-base paint to sand mold is stronger, the sufficiently high refractoriness of coating can be ensured, compound binding agent can provide between sand mold and moisture in air and effectively shield simultaneously, avoids the problem such as the reduction of sand mold intensity, the deterioration of coating using state, holiday caused due to water translocation to produce; Coating materials adopts zirconium English powder water based paint, both ensured and refractoriness enough during steel contacts, also can obtain than the better levelability of alcohol-base paint, surperficial fine and smooth degree, effectively improve the surface quality of foundry goods, make this dope layer have the combination property exceeding single coating.And obtain preparing three coatings by above-mentioned three coating components and according to this three coating of above-mentioned method brushing, more excellent combination property could being obtained through a large amount of tests; And draw through repetition test, if be used alone alcohol-base paint for this large-scale high-alloy steel foundry goods, the thickness of its dope layer must be brushed to the effect that just can reach qualified dope layer between 1 to 1.2 centimetre, and use composite dope layer of the present invention, the thickness of its coating can control between 0.8 to 1 centimetre, just can play shielding scab, improves the effect of surface quality, and because the thickness of coating reduces about 20%, so the dimensional accuracy of foundry goods is obviously improved.

Accompanying drawing explanation

For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated, wherein:

Fig. 1 is the preparation section schematic diagram of the composite dope coating for large-scale steel-casting waterglass sand mold of the present invention.

Detailed description of the invention

Composite dope layer process for large-scale steel-casting waterglass sand mold of the present invention is at waterglass sand mold surface of internal cavity brushing primer, second layer coating and coating materials three coating layer.First according to the method preparation coating of Fig. 1, primer is identical with second layer coating, and its each composition weight percentage composition is: zirconium English powder 70%, vinsol resin 0.3%, novolac resin 0.8%, lithium bentonite 1.5%, isopropyl alcohol 27.4%; Each composition weight percentage composition of outermost layer coating materials is: zirconium English powder 74%, vac-veova emulsion 2.2%, suspending agent 2.5%, association thickener 1.5%, and all the other components are water.

Then in casting mold cavity in brushing paint process, it is 65 ~ 75 ° of B é that primer controls Baume degrees when brushing, and with the industrial alcohol of content more than 99% adjustment Baume degrees, for large thick member capping, little thin pieces removes the limit;

For the sand mold having large plane, many people can be adopted to brush and to light simultaneously or progressively brush the mode brushing primer progressively lighted.

It is 75 ~ 85 ° of Be that second layer coating controls Baume degrees when brushing, and with the industrial alcohol of content more than 99% adjustment Baume degrees, for large thick member capping, little thin pieces removes the limit;

Coating materials controls Baume degrees 70 ~ 75 ° of B é when brushing, with water adjustment Baume degrees, to ensure enough coating layer thicknesses, good brushing performance, fine and smooth face coat.

Following table be each embodiment in casting mold cavity in brushing paint process, Selecting parameter during three coating brushings:

Select composite dope and the painting way of uniqueness of the present invention, the thickness of die cavity dope layer is starkly lower than the effective thickness of 1 to 1.2 centimetre that traditional coating coating mode must be brushed to, both improve surface quality of continuous castings, also significantly improve the dimensional accuracy of foundry goods.

Claims (1)

1., for a composite dope layer process for large-scale steel-casting waterglass sand mold, it is characterized in that:

Three layers of brushing are divided at the coating of described sand mold surface of internal cavity, primer is identical with second layer coating, and its each composition weight percentage composition is: zirconium English powder 70%, vinsol resin 0.3%, novolac resin 0.8%, lithium bentonite 1.5%, isopropyl alcohol 27.4%; Each composition weight percentage composition of outermost layer coating materials is: zirconium English powder 74%, vac-veova emulsion 2.2%, suspending agent 2.5%, association thickener 1.5%, and all the other components are water;

In casting mold cavity in brushing paint process, it is 65 ~ 75 ° of B é that primer controls Baume degrees when brushing, and with the industrial alcohol of content more than 99% adjustment Baume degrees, for large thick member capping, little thin pieces removes the limit;

It is 75 ~ 85 ° of B é that second layer coating controls Baume degrees when brushing, and with the industrial alcohol of content more than 99% adjustment Baume degrees, for large thick member capping, little thin pieces removes the limit;

Coating materials controls Baume degrees 70 ~ 75 ° of B é when brushing, with water adjustment Baume degrees, to ensure enough coating layer thicknesses, good brushing performance, fine and smooth face coat.