CN105522103A - Carbon-nanofiber-enhanced light low-carbon-residue water-based paint for evaporative-pattern casting and manufacturing method thereof - Google Patents

Abstract

The invention relates to the technical field of evaporative-pattern casting, in particular to a nano-calcium-carbonate-enhanced low-carbon-residue water-based paint for evaporative-pattern casting and a manufacturing method thereof. According to the water-based paint, high-aluminum fine powder, magnesia and brown corundum powder which are different in particle sizes are mixed to serve as a refractory aggregate, so that the water-based paint has good air permeability and high-temperature stability; a mixed suspending agent prepared from nano calcium carbonate, sodium carboxymethylcellulose and other materials can be well mixed with inorganic powder and resin emulsion, so that the fluidity and coating property of the paint are improved effectively, and dimensional stability to heating is enhanced and improved; added nano ceria has oxygen storage capacity, and oxygen can be released in the casting process, so that the oxidative combustion efficiency of plastic is improved, and carbon residues are reduced. Moreover, a coating layer produced from the manufactured paint is stable in performance when heated, not prone to collapsing and breaking, compact and breathable and capable of being stripped off and removed easily; and the number of impurities on the surfaces of manufactured castings is smaller, and quality of the manufactured castings is better.

Description

A kind of low carbon residue Water-based coating for lost foam casting of lightweight containing carbon nano-fiber enhancing and preparation method thereof

Technical field

The present invention relates to Technology of EPC field, be specifically related to a kind of low carbon residue Water-based coating for lost foam casting of lightweight containing carbon nano-fiber enhancing and preparation method thereof.

Background technology

Refractory Coating for Lost Foam Casting refers to one deck handtailor coating being coated in apperance outer surface in lost foam casting process, it plays critical effect in casting process, because apperance is made up of foamed plastics, the character such as gas permeability, strength of coating, rheological characteristic of coating all will produce vital impact to cast article, the lost foam paint of function admirable should meet: (1) can assist the intensity and rigidity that improve foam plastics mould, prevents apperance from destroying and distortion; (2) there is buffer action, molten metal and model are separated, prevent molten metal from infiltrating in dry sand, prevent cast(ing) surface from forming defect; (3) permeation functions, gets rid of apperance in time and decomposes the gas or liquid that produce, prevent foundry goods from occurring pore, carbon black defect etc.; (4) good sintering fissility, anti-sand viscosity, anti-metal liquid aggressivity etc. will be had; (5) characteristic such as good wetability, being coated with property, the feature of environmental protection, heat endurance, protection against the tide will be had.

Lost foam paint composition mainly comprises the compositions such as refractory aggregate, bonding agent, solvent, suspending agent and various additives, the adhesive properties used by it is divided and is mainly divided into several classes such as water based paint, alcohol-base paint, cold coating, wherein water based paint because cost lower apply in actual production comparatively extensive, but water based paint exists when coating is cleared up easily defeated and dispersed, easy scab, and the serviceability of most of product still existing defects, do not reach foregoing effect.

Summary of the invention

The object of the invention is to, prepare a kind of low carbon residue Water-based coating for lost foam casting of lightweight strengthened containing carbon nano-fiber, to obtain the apperance coating with high strength, highly-breathable, low carbon residue, thus improve casting quality, to achieve these goals, the technical solution used in the present invention is as follows:

A kind of low carbon residue Water-based coating for lost foam casting of lightweight strengthened containing carbon nano-fiber, it is characterized in that, this coating is made up of the raw material of following weight portion: 300-400 order magnesium silicate 4-6, 200-300 order mullite powder 30-40, aquadag powder 6-8, 180-200 order alumina silicate fibre powder 20-30, carbon nano-fiber 0.1-0.2, sodium bentonite 1-2, white glue with vinyl 1-2, water-borne acrylic resin 1-1.5, sodium lignin sulfonate 0.01-0.02, peregal 0.01-0.02, nano ceric oxide 0.01-0.02, sodium carboxymethylcellulose 0.1-0.2, anticorrisive agent 0.001-0.002, defoamer 0.01-0.02, soft water 30-40.

The preparation method of described a kind of low carbon residue Water-based coating for lost foam casting of lightweight containing carbon nano-fiber enhancing, it is characterized in that, described preparation method is:

(1) first sodium lignin sulfonate, peregal, sodium carboxymethylcellulose are dropped in soft water, be stirred to after dissolving completely, drop into carbon nano-fiber, nano ceric oxide, ultrasonic high-speed stirred makes it dispersed in the solution, add sodium bentonite more subsequently, mixed grinding dispersion 30-40min, gained mixed slurry is for subsequent use;

(2) drop in agitator together with the slurry prepared by mullite powder, aquadag powder, alumina silicate fibre powder and the step (1) of 20-25 weight portion, after high-speed stirred dispersion 30-40min, add other leftover materials all again, and add soft water according to required slurry density, continue dispersed with stirring 40-50min again, to obtain final product.

The mullite powder that coating of the present invention there are differences with particle diameter, aquadag powder, the mixing of alumina silicate fibre powder is as refractory aggregate, there is good gas permeability and high-temperature stability, lubrication cracking resistance, with sodium bentonite, mix suspending agent prepared by the materials such as sodium carboxymethylcellulose effectively raises the mobility of coating and being coated with property, wherein the carbon nano-fiber of blending has excellent enhancing, creep resistant, improve the effects such as gas permeability, the nano ceric oxide added has oxygen storage capacity, energy releasing oxygen in casting process, improve the oxidizing fire efficiency of plastics, reduce carbon residue, paint coatings lightweight prepared by this invention is tough and tensile, air-and water-permeable, is easy to peel off cleaning, and the cast(ing) surface impurity of preparation is less, and quality is better.

Detailed description of the invention

Embodiment

The coating of the present embodiment is made up of the raw material of following weight portion: 300 order magnesium silicate 5,200 order mullite powders 35, aquadag powder 7,180 order alumina silicate fibre powder 25, carbon nano-fiber 0.1, sodium bentonite 1.5, white glue with vinyl 1.5, water-borne acrylic resin 1.2, sodium lignin sulfonate 0.01, peregal 0.01, nano ceric oxide 0.01, sodium carboxymethylcellulose 0.1, anticorrisive agent 0.001, defoamer 0.01, soft water 30.

The preparation method of this coating is:

(1) first sodium lignin sulfonate, peregal, sodium carboxymethylcellulose are dropped in soft water, be stirred to after dissolving completely, drop into carbon nano-fiber, nano ceric oxide, ultrasonic high-speed stirred makes it dispersed in the solution, add sodium bentonite more subsequently, mixed grinding dispersion 35min, gained mixed slurry is for subsequent use;

(2) drop in agitator together with the slurry prepared by mullite powder, aquadag powder, alumina silicate fibre powder and the step (1) of 25 weight portions, after high-speed stirred dispersion 35min, add other leftover materials all again, and add appropriate soft water, continue dispersed with stirring 40min, adjusting coating density is 60 Baume degrees, to obtain final product.

Coating property test result obtained by the present embodiment is:

Test item	Testing result
		Strength of coating (0.8mm thick coating)	4.78×10 5Pa
Gas permeability (0.8mm thick coating × 1200 DEG C)	4.16cm 4·(g·min) -1
		Suspension (24h)	100％
Once be coated with thickness δ	0.3mm
		High temperature cracking resistance grade	One-level

Claims (2)

1. the low carbon residue Water-based coating for lost foam casting of lightweight strengthened containing carbon nano-fiber, it is characterized in that, this coating is made up of the raw material of following weight portion: 300-400 order magnesium silicate 4-6, 200-300 order mullite powder 30-40, aquadag powder 6-8, 180-200 order alumina silicate fibre powder 20-30, carbon nano-fiber 0.1-0.2, sodium bentonite 1-2, white glue with vinyl 1-2, water-borne acrylic resin 1-1.5, sodium lignin sulfonate 0.01-0.02, peregal 0.01-0.02, nano ceric oxide 0.01-0.02, sodium carboxymethylcellulose 0.1-0.2, anticorrisive agent 0.001-0.002, defoamer 0.01-0.02, soft water 30-40.

2. a kind of preparation method of the low carbon residue Water-based coating for lost foam casting of lightweight strengthened containing carbon nano-fiber as claimed in claim 1, it is characterized in that, described preparation method is:

(1) first sodium lignin sulfonate, peregal, sodium carboxymethylcellulose are dropped in soft water, be stirred to after dissolving completely, drop into carbon nano-fiber, nano ceric oxide, ultrasonic high-speed stirred makes it dispersed in the solution, add sodium bentonite more subsequently, mixed grinding dispersion 30-40min, gained mixed slurry is for subsequent use;

(2) drop in agitator together with the slurry prepared by mullite powder, aquadag powder, alumina silicate fibre powder and the step (1) of 20-25 weight portion, after high-speed stirred dispersion 30-40min, add other leftover materials all again, and add soft water according to required slurry density, continue dispersed with stirring 40-50min again, to obtain final product.