CN104226893A

CN104226893A - Lost foam casting coating and preparation method thereof

Info

Publication number: CN104226893A
Application number: CN201410430807.9A
Authority: CN
Inventors: 浦巧生
Original assignee: Wujiang Hydraulic Components Foundry Co Ltd
Current assignee: Wujiang Hydraulic Components Foundry Co Ltd
Priority date: 2014-08-29
Filing date: 2014-08-29
Publication date: 2014-12-24
Anticipated expiration: 2034-08-29
Also published as: CN104226893B

Abstract

The invention discloses a lost foam casting coating and a preparation method thereof. The coating is prepared by mica powder, quartz powder, silicon sol, water, vegetable oil, alums, calcium carbonate, normal butanol, rosin and alkyl benzene sulfonic acid; the mica powder, the quartz powder and the calcium carbonate are respectively filtered by a 300-mesh screen. The preparation method of the coating comprises the following steps: placing the rosin in the normal butanol, slowly heating the mixture of the rosin and normal butanol to 40 to 50 DEG C, adding the calcium carbonate after the rosin is completely dissolved, adequately stirring the calcium carbonate to obtain a solution A, adequately mixing the mica powder, the quartz powder and the silicon solution to obtain a suspension liquid B, dissolving the alkyl benzene sulfonic acid in the water to obtain a solution C, adequately mixing the solution A and the suspension liquid B, adding the solution C, finally adding the alums, and mixing the alums and the solution to obtain the lost foam casting coating. The lost foam coasting coating is wide in source of raw materials, low in production cost and simple in preparation method, and a prepared casting is smooth in surface and free from being bonded with sand.

Description

A kind of lost foam casting coating and preparation method thereof

Technical field

The present invention relates to a kind of lost foam casting coating, belong to casting technology field.

Background technology

Different from common sand cast paint, coating for dispellable mould casting is not be coated on casting mold die cavity, but is coated on foamed polystyrene pattern.When foamed polystyrene pattern is replaced by liquid metal, what in fact coating played is casting mold effect, thus has saying of " namely coating being casting mold ".During cast, a large amount of gases that foamed plastics thermal decomposition produces can will be discharged outside casting mold by space between fireproof coating and dry sand.

When carrying out evaporative pattern castings production, foam can produce a large amount of gas.If the gas permeability of coating is bad, the foundry goods produced will be made to produce a large amount of pores, foundry goods is scrapped.If the refractoriness do not had, foundry goods will be made to produce scab, thus cause metalworking difficulty even to scrap.If the cold strength do not had, the coating on evaporative pattern will be made cracking to occur or peel off, thus generation scab or coating interlayer make foundry goods scrap.

Summary of the invention

The object of the invention is to overcome the deficiencies in the prior art, provide that a kind of intensity is high, the lost foam casting coating of good permeability and preparation method thereof.

The present invention is achieved through the following technical solutions:

A kind of lost foam casting coating, is made up of the raw material of following parts by weight: mica powder 80-100 part, silica flour 80-100 part, Ludox 4-8 part, water 15-18 part, vegetable oil 10-15 part, alum 18-22 part, calcium carbonate 3-9 part, n-butanol 10-15 part, rosin 2-3 part and alkyl benzene sulphonate 1-3 part; Described mica powder, silica flour and calcium carbonate all cross 300 mesh sieves.

Described a kind of lost foam casting coating, the weight ratio of described mica powder and silica flour is 1:1.

Described a kind of lost foam casting coating, in described silica flour, the content of silica is greater than 98%.

Described a kind of lost foam casting coating, the weight ratio of described rosin and n-butanol is 1:5.

Described a kind of lost foam casting coating, described Ludox is alkaline silica sol, and its 20 DEG C of viscosity are 4.5-5.0*10 ^-3pas.

The preparation method of described a kind of lost foam casting coating, rosin is placed in n-butanol, slowly be heated to 40-50 DEG C, after rosin dissolves completely, add after calcium carbonate fully stirs and obtain solution A, after mica powder and silica flour fully being mixed with Ludox, obtain suspension B, solution C is obtained by soluble in water for alkyl benzene sulphonate, after solution A and suspension B fully being mixed, add solution C, finally add alum and carry out being mixed to get lost foam casting coating.

The beneficial effect that the present invention reaches:

Lost foam casting coating raw material sources of the present invention are extensive, production cost is low, preparation method is simple, and adopt resistant to elevated temperatures Ludox as binding agent, bond effect is good, add mica powder and alum, improve coating intensity under the high temperature conditions, feed particles is careful, and coating is easily peeled off, thus make the cast(ing) surface that obtains smooth, not scab.

Detailed description of the invention

Below in conjunction with embodiment, the invention will be further described.Following examples only for technical scheme of the present invention is clearly described, and can not limit the scope of the invention with this.

Embodiment 1

In the present embodiment, a kind of lost foam casting coating, is made up of the raw material of following parts by weight: mica powder 80 parts, silica flour 80 parts, Ludox 4 parts, 18 parts, water, vegetable oil 15 parts, 18 parts, alum, 9 parts, calcium carbonate, n-butanol 10 parts, rosin 2 parts and alkyl benzene sulphonate 3 parts; Described mica powder, silica flour and calcium carbonate all cross 300 mesh sieves.

Wherein, in described silica flour, the content of silica is greater than 98%, and described Ludox is alkaline silica sol, and its 20 DEG C of viscosity are 5.0*10 ^-3pas.

The preparation method of described a kind of lost foam casting coating, rosin is placed in n-butanol, slowly be heated to 50 DEG C, after rosin dissolves completely, add after calcium carbonate fully stirs and obtain solution A, after mica powder and silica flour fully being mixed with Ludox, obtain suspension B, solution C is obtained by soluble in water for alkyl benzene sulphonate, after solution A and suspension B fully being mixed, add solution C, finally add alum and carry out being mixed to get lost foam casting coating.

Embodiment 2

In the present embodiment, a kind of lost foam casting coating, is made up of the raw material of following parts by weight: mica powder 100 parts, silica flour 100 parts, Ludox 8 parts, 15 parts, water, vegetable oil 10 parts, 22 parts, alum, 3 parts, calcium carbonate, n-butanol 15 parts, rosin 3 parts and alkyl benzene sulphonate 1 part; Described mica powder, silica flour and calcium carbonate all cross 300 mesh sieves.

Wherein, in described silica flour, the content of silica is greater than 98%, and described Ludox is alkaline silica sol, and its 20 DEG C of viscosity are 4.5*10 ^-3pas.

The preparation method of described a kind of lost foam casting coating, rosin is placed in n-butanol, slowly be heated to 40 DEG C, after rosin dissolves completely, add after calcium carbonate fully stirs and obtain solution A, after mica powder and silica flour fully being mixed with Ludox, obtain suspension B, solution C is obtained by soluble in water for alkyl benzene sulphonate, after solution A and suspension B fully being mixed, add solution C, finally add alum and carry out being mixed to get lost foam casting coating.

Embodiment 3

In the present embodiment, a kind of lost foam casting coating, is made up of the raw material of following parts by weight: mica powder 95 parts, silica flour 95 parts, Ludox 6 parts, 16 parts, water, vegetable oil 13 parts, 20 parts, alum, 7 parts, calcium carbonate, n-butanol 10 parts, rosin 2 parts and alkyl benzene sulphonate 3 parts; Described mica powder, silica flour and calcium carbonate all cross 300 mesh sieves.

The preparation method of described a kind of lost foam casting coating, rosin is placed in n-butanol, slowly be heated to 45 DEG C, after rosin dissolves completely, add after calcium carbonate fully stirs and obtain solution A, after mica powder and silica flour fully being mixed with Ludox, obtain suspension B, solution C is obtained by soluble in water for alkyl benzene sulphonate, after solution A and suspension B fully being mixed, add solution C, finally add alum and carry out being mixed to get lost foam casting coating.

The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and distortion, these improve and distortion also should be considered as protection scope of the present invention.

Claims

1. a lost foam casting coating, it is characterized in that, be made up of the raw material of following parts by weight: mica powder 80-100 part, silica flour 80-100 part, Ludox 4-8 part, water 15-18 part, vegetable oil 10-15 part, alum 18-22 part, calcium carbonate 3-9 part, n-butanol 10-15 part, rosin 2-3 part and alkyl benzene sulphonate 1-3 part; Described mica powder, silica flour and calcium carbonate all cross 300 mesh sieves.

2. a kind of lost foam casting coating according to claim 1, is characterized in that, the weight ratio of described mica powder and silica flour is 1:1.

3. a kind of lost foam casting coating according to claim 1, is characterized in that, in described silica flour, the content of silica is greater than 98%.

4. a kind of lost foam casting coating according to claim 1, is characterized in that, the weight ratio of described rosin and n-butanol is 1:5.

5. a kind of lost foam casting coating according to claim 1, is characterized in that, described Ludox is alkaline silica sol, and its 20 DEG C of viscosity are 4.5-5.0*10 ^-3pas.

6. the preparation method of a kind of lost foam casting coating according to claim 1, it is characterized in that, rosin is placed in n-butanol, is slowly heated to 40-50 DEG C, after rosin dissolves completely, add after calcium carbonate fully stirs and obtain solution A, obtain suspension B after mica powder and silica flour fully being mixed with Ludox, obtain solution C by soluble in water for alkyl benzene sulphonate, after solution A and suspension B are fully mixed, add solution C, finally add alum and carry out being mixed to get lost foam casting coating.