CN104014722A - Active carbon/kaolin composite alcohol-group casting coating and preparation method thereof - Google Patents

Abstract

The invention discloses an active carbon/kaolin composite alcohol-group casting coating, which is characterized by being prepared from the following raw materials in parts by weight: 45-55 parts of brown aluminum oxide, 3-5 parts of active carbon, 30-45 parts of kaolin, 2-4 parts of ethyl orthosilicate, 0.4-0.7 parts of antimonous oxide, 0.5-1.1 parts of rosin glycerin ester, 2-3 parts of polyvinyl alcohol, 0.3-0.6 part of polypropylene fiber; 0.2-0.4 part of chlorylene; 8-12 parts of peanut shell, 3-5 parts of phenol resin; 1-4 parts of hexamethylene-tetramine, 40-54 parts of ethylalcohol and 3-7 parts of assistants. The prepared coating has the advantage of good high-temperature resistance, crack resistance and air permeability; after being carbonized, the peanut shell can be used as a suspending agent for the casting coating so as to improve the suspending performance of the coating.

Description

Alcohol-base foundry coating that a kind of active carbon/kaolin is compound and preparation method thereof

Technical field

The present invention relates to cast paint field, be specifically related to compound alcohol-base foundry coating of a kind of active carbon/kaolin 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.While acting on foundry goods, require coating have good processing performance, service behaviour, quality stability and apply reappearance, can play on the one hand heat insulation, equalization temperature, exempt the object of impingment corrosion of molten metal, can prevent on the other hand the defects such as cracking that cast product causes because Local cooling is too fast, sand holes, white iron formation.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 coating, does not need to dry, and can shorten the production cycle, simplifies technique, reduces drying plant investment, is to be cast a kind of quick drying paint that boundary is widely used, and has been widely used in the production of steel, iron, coloured foundry goods.

But in prior art, alcohol-base foundry coating has many defects, such as: suspension stability is poor, in long-distance transport and easily layering in depositing process, resistance to elevated temperatures is poor, hardness is low, a little less than poor chemical stability, low, the anti-stick grittiness of anti-metal performance of flushing etc., make alcohol-base foundry coating function singleness, cannot meet large-scale industrial production.

Summary of the invention

Object of the present invention is just to provide compound alcohol-base foundry coating of a kind of active carbon/kaolin and preparation method thereof, to overcome the deficiencies in the prior art.

The object of the present invention is achieved like this:

The alcohol-base foundry coating that a kind of active carbon/kaolin is compound, it is characterized in that, made by the raw material of following weight portion: brown corundum 45-55, active carbon 3-5, kaolin 30-45, silester 2-4, antimony oxide 0.4-0.7, ester gum 0.5-1.1, polyvinyl alcohol 2-3, polypropylene fibre 0.3-0.6, trichloro-ethylene 0.2-0.4, peanut shell 8-12, phenolic resins 3-5, hexa 1-4, ethanol 40-54, auxiliary agent 3-7.

Described auxiliary agent is made up of following raw materials in part by weight: pig bone 25-30, rectorite 35-45, metakaolin 65-95, silicon ash 30-45, Silane coupling reagent KH-570 2-6, Ludox 0.4-0.8, nano carborundum powder 1-3, nano ferriferrous oxide 1.2-3.4, angelica powder 0.6-1.2, sodium carboxymethyl starch 0.4-0.9, carboxymethyl cellulose 4-7, suitable quantity of water, its preparation method is by pig bone, rectorite, metakaolin is put into calcining furnace and calcine 2-3 hour at 560-680 DEG C, take out, the hydrochloric acid solution of putting into 8-12% soaks 4-5 hour, filter and take out, use clear water cyclic washing, dry and pulverize, stirring pulping adds water, simultaneously, add nano carborundum powder, Ludox, sodium carboxymethyl starch grinds, the dry xeraphium that makes of spraying, get silicon ash, angelica powder and add Silane coupling reagent KH-570 to stir to make slurry, plus nano tri-iron tetroxide grinds 20-30 minute, makes the silicon ash of modification, by the grinding granulation that adds water of the above-mentioned xeraphium making, modified silicon ash and other residual components, dry and get final product.

The preparation method of the compound alcohol-base foundry coating of described a kind of active carbon/kaolin, is characterized in that comprising the following steps:

(1) peanut shell is put into retort calcination processing 3-4 hour at 405-520 DEG C, taken out, the hydrochloric acid solution of putting into 10-12% soaks 3-6 hour, filter and take out, use clear water cyclic washing, dry and pulverize, spray vaporific ester gum and stir and evenly mix, the modified peanut ash of system;

(2) together with the ethanol of modified peanut ash above-mentioned steps being made and kaolin, 1/4 weight, grind and be heated to 140-160 DEG C, add polypropylene fibre, silester, polyvinyl alcohol to keep temperature to stir 1-2 hour, be cooled to 50-60 DEG C and add antimony oxide to grind 30-40 minute, the dry xeraphium that makes of spraying;

(3) active carbon is put into calcining furnace and calcined 2-4 hour at 530-680 DEG C, take out cooling crush, add the ethanol of 1/5 weight to stir, leave standstill 10-12 hour, then add trichloro-ethylene, phenolic resins, hexa to be heated to 70-80 DEG C and stir 30-40 minute;

(4) brown corundum is dropped in reactor, add the ethanol agitation grinding 10-15 minute of surplus, then add step (2), (3) product, auxiliary agent, temperature of reaction kettle is slowly risen to 75-85 DEG C simultaneously, keep temperature to stir 20-40 minute, grind until fineness reaches 50 μ m below.

The present invention has following beneficial effect: the invention provides a kind of peanut shell secondary and utilize the approach of discarded object, after peanut shell charing is processed, for the suspending agent of cast paint, can strengthen the suspension of coating; The coating that the present invention makes has the advantages such as good high temperature resistant, crack resistance and gas permeability, and coating of the present invention goes for various foundry goods, meets the various requirement of casting.

Detailed description of the invention

The described compound alcohol-base foundry coating of a kind of active carbon/kaolin, it is characterized in that, made by the raw material of following weight portion: brown corundum 49, active carbon 4, kaolin 38, silester 2, antimony oxide 0.6, ester gum 0.8, polyvinyl alcohol 2, polypropylene fibre 0.4, trichloro-ethylene 0.2, peanut shell 8, phenolic resins 3, hexa 1, ethanol 43, auxiliary agent 3.

Described auxiliary agent is made up of following raw materials in part by weight: pig bone 26, rectorite 38, metakaolin 85, silicon ash 30, Silane coupling reagent KH-570 2, Ludox 0.4, nano carborundum powder 1, nano ferriferrous oxide 1.2, angelica powder 0.6, sodium carboxymethyl starch 0.4, carboxymethyl cellulose 4, suitable quantity of water, its preparation method is by pig bone, rectorite, metakaolin is put into calcining furnace and calcine 2-3 hour at 560-680 DEG C, take out, the hydrochloric acid solution of putting into 8-12% soaks 4-5 hour, filter and take out, use clear water cyclic washing, dry and pulverize, stirring pulping adds water, simultaneously, add nano carborundum powder, Ludox, sodium carboxymethyl starch grinds, the dry xeraphium that makes of spraying, get silicon ash, angelica powder and add Silane coupling reagent KH-570 to stir to make slurry, plus nano tri-iron tetroxide grinds 20-30 minute, makes the silicon ash of modification, by the grinding granulation that adds water of the above-mentioned xeraphium making, modified silicon ash and other residual components, dry and get final product.

Preparation method comprises the following steps:

(1) peanut shell is put into retort calcination processing 3-4 hour at 405-520 DEG C, taken out, the hydrochloric acid solution of putting into 10-12% soaks 3-6 hour, filter and take out, use clear water cyclic washing, dry and pulverize, spray vaporific ester gum and stir and evenly mix, the modified peanut ash of system;

(2) together with the ethanol of modified peanut ash above-mentioned steps being made and kaolin, 1/4 weight, grind and be heated to 140-160 DEG C, add polypropylene fibre, silester, polyvinyl alcohol to keep temperature to stir 1-2 hour, be cooled to 50-60 DEG C and add antimony oxide to grind 30-40 minute, the dry xeraphium that makes of spraying;

(3) active carbon is put into calcining furnace and calcined 2-4 hour at 530-680 DEG C, take out cooling crush, add the ethanol of 1/5 weight to stir, leave standstill 10-12 hour, then add trichloro-ethylene, phenolic resins, hexa to be heated to 70-80 DEG C and stir 30-40 minute;

(4) brown corundum is dropped in reactor, add the ethanol agitation grinding 10-15 minute of surplus, then add step (2), (3) product, auxiliary agent, temperature of reaction kettle is slowly risen to 75-85 DEG C simultaneously, keep temperature to stir 20-40 minute, grind until fineness reaches 50 μ m below.

The operation technique index of processing the cast paint obtaining by above-described embodiment is as follows:

(1) solid content: 33.21%;

(2) coating abrasion performance: 0.37;

(3) gas forming amount: 12.6 mL/g;

(4) coating density: 1.48g/cm ³;

(5) hot permeability of coating: 21.6 cm ²(kpamin) ^-1;

(6) coating, oven dry, cooling rear appearance of coat: the uniform coating of flawless, nothing foaming and macroscopic pin hole.

Claims (2)

1. the alcohol-base foundry coating that active carbon/kaolin is compound, it is characterized in that, made by the raw material of following weight portion: brown corundum 45-55, active carbon 3-5, kaolin 30-45, silester 2-4, antimony oxide 0.4-0.7, ester gum 0.5-1.1, polyvinyl alcohol 2-3, polypropylene fibre 0.3-0.6, trichloro-ethylene 0.2-0.4, peanut shell 8-12, phenolic resins 3-5, hexa 1-4, ethanol 40-54, auxiliary agent 3-7, described auxiliary agent is made up of following raw materials in part by weight: pig bone 25-30, rectorite 35-45, metakaolin 65-95, silicon ash 30-45, Silane coupling reagent KH-570 2-6, Ludox 0.4-0.8, nano carborundum powder 1-3, nano ferriferrous oxide 1.2-3.4, angelica powder 0.6-1.2, sodium carboxymethyl starch 0.4-0.9, carboxymethyl cellulose 4-7, suitable quantity of water, its preparation method is by pig bone, rectorite, metakaolin is put into calcining furnace and calcine 2-3 hour at 560-680 DEG C, take out, the hydrochloric acid solution of putting into 8-12% soaks 4-5 hour, filter and take out, use clear water cyclic washing, dry and pulverize, stirring pulping adds water, simultaneously, add nano carborundum powder, Ludox, sodium carboxymethyl starch grinds, the dry xeraphium that makes of spraying, get silicon ash, angelica powder and add Silane coupling reagent KH-570 to stir to make slurry, plus nano tri-iron tetroxide grinds 20-30 minute, makes the silicon ash of modification, by the grinding granulation that adds water of the above-mentioned xeraphium making, modified silicon ash and other residual components, dry and get final product.

2. the preparation method of the compound alcohol-base foundry coating of a kind of active carbon/kaolin according to claim 1, is characterized in that comprising the following steps:

(1) peanut shell is put into retort calcination processing 3-4 hour at 405-520 DEG C, taken out, the hydrochloric acid solution of putting into 10-12% soaks 3-6 hour, filter and take out, use clear water cyclic washing, dry and pulverize, spray vaporific ester gum and stir and evenly mix, the modified peanut ash of system;

(2) together with the ethanol of modified peanut ash above-mentioned steps being made and kaolin, 1/4 weight, grind and be heated to 140-160 DEG C, add polypropylene fibre, silester, polyvinyl alcohol to keep temperature to stir 1-2 hour, be cooled to 50-60 DEG C and add antimony oxide to grind 30-40 minute, the dry xeraphium that makes of spraying;

(3) active carbon is put into calcining furnace and calcined 2-4 hour at 530-680 DEG C, take out cooling crush, add the ethanol of 1/5 weight to stir, leave standstill 10-12 hour, then add trichloro-ethylene, phenolic resins, hexa to be heated to 70-80 DEG C and stir 30-40 minute;

(4) brown corundum is dropped in reactor, add the ethanol agitation grinding 10-15 minute of surplus, then add step (2), (3) product, auxiliary agent, temperature of reaction kettle is slowly risen to 75-85 DEG C simultaneously, keep temperature to stir 20-40 minute, grind until fineness reaches 50 μ m below.