CN1069432A

CN1069432A - Casting type, core sand binder

Info

Publication number: CN1069432A
Application number: CN 91107467
Authority: CN
Inventors: 吴正永; 梁现信; 庄伟忆; 毕元洁; 张�林
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-08-14
Filing date: 1991-08-14
Publication date: 1993-03-03
Anticipated expiration: 2006-08-14
Also published as: CN1025659C

Abstract

The casting that the present invention relates to is characterized in utilizing respectively asphalt, vegetable oil oil foot to be primary raw material with type, core sand binder, and auxiliary materials such as adding certain amount of solvent, acid or alkali are formulated.Synthesis technique is: (1) moulding sand binder is with asphalt and solvent heating to 150 ℃, stirs and be incubated 4 hours; (2) core sand binder is with vegetable oil oil foot and acid or alkali and solvent heating to 150 ℃, stirs and be incubated 4 hours.The inexpensive source of the present invention foot, technology is extremely simple, do not contain poisonous and excitor substance again, and casting character is good, every Casting Technology index is all similar with the tung oil of transmission, and especially to adopt the asphalt of rich carbon be primary raw material to moulding sand binder, can significantly reduce the incorporation of Datong District's coal dust, and can greatly improve the surface smoothness of foundry goods, thereby be desirable novel binders.

Description

Casting type, core sand binder

The present invention relates to a kind of molding sand, core sand binder that utilizes the foundary industry special use that vegetable oil oil foot and asphalt makes, be applicable to that foundary industry manufactures the sand mold and the core of different shape.

The binding agent that uses in foundary industry at present generally can be divided into three types, promptly vegetable oil, close fat and araldite.The technology of vegetable oil binding agent is the most ripe, use with a long history, various process performance index are also comparatively superior, but the primary raw material tung oil of this binding agent, flax wet goods are the valuable raw materials of national defense industry and chemical industry, not only should not be a large amount of be used for foundary industry, and from also not too reasonable economically; The synthetic fat binder primary raw material is the product of paying of chemical industry such as soapmaking, papermaking and PETROLEUM PROCESSING, light industry, but the casting technique performance of existing synthetic fat binder is relatively poor, and intensity is lower, is difficult to guarantee casting quality, and raw material sources are also very short; And araldite costs an arm and a leg, and output also is difficult to satisfy the wilderness demand of foundary industry.

The objective of the invention is to overcome the deficiency of above-mentioned prior art, provide a kind of cheap, raw material is sufficient, casting technique performance and tung oil, linseed oil are close, indivedual more superior novel binders of technical indicator.By retrieval, in CN1044607A, CN1032127A, four patents of GK85101910, GK86100763, speak of respectively and utilize the vegetable oil oil foot to make binder for casting, but no matter be the raw material proportioning, still manufacture craft all has obvious difference with the present invention, manufacture craft particularly, the present invention is all simple and convenient than above-mentioned four patents.

The present invention requires to be divided into molding sand and two kinds of binding agents of core sand according to the different process of system type, coremaking.

One, the present invention is synthetic by following raw materials according

1. vegetable oil residue: comprise the oil foot of dryness and semi-drying, as the oil foot of rape oil, rice bran oil, cottonseed oil, sesame oil, corn oil, sunflower oil, soya-bean oil, rubber seed oil, safflower oil, walnut oil, hempseed wet goods.

2. asphalt;

3. solvent: as kerosene, diesel oil etc.;

4. acid or alkali: example hydrochloric acid, calcium hydroxide etc.;

Two, synthetic ratio of the present invention

1. moulding sand binder:

Asphalt 40～70%

Solvent 30～60%

Vegetable oil residue 0～50%

2. core sand binder

Vegetable oil residue 50～90%

Acid or alkali 1～15%

Solvent 5～45%

(also can add resins 0～10% such as rosin) to improve baked tensile strength.

Three, technical process of the present invention

1. moulding sand binder

(1) asphalt is put into the reactor fusing of heating;

(2) treat that asphalt melts the back fully and adds vegetable oil residue and stirring solvent;

(3) above-mentioned synthetic is heated to 100 ℃, be incubated 4 hours;

(4) lower the temperature and the still basin.

2. core sand binder

(1) pH-value and the iodine number to used vegetable oil residue raw material detects;

(2) vegetable oil residue is put into reactor, and adds corresponding acid or alkali according to testing result, make its pH value for＜7, iodine number＞100, heat to 150 ℃;

(3) put into stirring solvent and heating, be incubated 4 hours to 150 ℃;

(4) lower the temperature and the still basin.

Four, advantage of the present invention is:

1. cheap, the raw material abundance.The used primary raw material of the present invention is vegetable oil oil foot and asphalt, is other industrial waste materials or pays product, thereby have the remarkable advantage of inexpensive source foot.Moulding sand binder uses this carbon-rich materials of asphalt morely, thereby can significantly reduce the incorporation (reduction is about 2/3) of Datong District's coal dust in the molding sand proportion, and further reduces the casting cost; The core sand binder price only is 1/4 of a tung oil, also hangs down 10～20% than closing fat.

2. nontoxic, non-stimulated.The present invention does not contain poisonous and excitor substances such as phenol, aldehyde, aromatic hydrocarbon.

3. casting character is better.Moulding sand binder adhesion strength height can not make sand mold surface produce to break or sticks up skin; Because this carbon-rich material of employing asphalt is a primary raw material, when contact high temperature, can produces vaporific bright carbon film foundry goods and sand mold are separated again, can prevent the scab and the burning into sand defective of foundry goods effectively, thereby improve the surface smoothness of foundry goods greatly; The tensile strength of core sand binder and tung oil, linseed oil are suitable, stronger than synthetic fat binder, main casting character such as mucous membrane, creep resistance, resistance to water soak, gas-forming property, elevated temperature strength etc. are all close with the vegetable oil binding agent, thereby are the desirable replacement traditional plant oil binder and the novel binders of synthetic fat binder.

Embodiments of the invention:

1. moulding sand binder:.

(1) 500 kilograms of asphalt being put into reactor heats to 80～100 ℃;

(2) treat that asphalt melts the back fully and adds 100 kilograms of vegetable oil oil foots and 400 kilograms of stirring solvent;

(3) above-mentioned synthetic is heated to 100 ℃, be incubated 4 hours;

(4) go out the still basin after the cooling cooling.

2. core sand binder:

(1) 700 kilograms of preparation of soya-oil dregs and 30 kilograms of hydrochloric acid being put into reactor heats to 150 ℃;

(2) stir after putting into 270 kilograms of solvents;

(3) heat to 150 ℃, be incubated 4 hours;

(4) go out the still basin after the cooling cooling.

Claims

1, a kind of casting type, core sand binder is characterized in that its composition of raw materials is:

(1) moulding sand binder:

Asphalt 40～70%

Solvent 30～60%

Vegetable oil residue 0～50%

(2) core sand binder

Vegetable oil residue 50～90%

Acid or alkali 1～15%

Solvent 5～45%

(also can add resins 0～10% such as rosin) to improve baked tensile strength.

2, as the said casting of claim 1 type, core sand binder, it is characterized in that synthesis technique is:

(1) moulding sand binder:

A. asphalt is put into the reactor fusing of heating;

B. treat that asphalt melts the back fully and adds vegetable oil residue and stirring solvent;

C. above-mentioned synthetic is heated to 100 ℃, be incubated 4 hours;

D. lower the temperature and the still basin.

(2) core sand binder:

A. pH-value and the iodine number to used vegetable oil residue raw material detects;

B. vegetable oil residue is put into reactor, and adds corresponding acid or alkali according to testing result, make its pH value for＞7, iodine number＞100, heat to 150 ℃;

C. put into stirring solvent and heat, be incubated 4 hours to 150 ℃;

D. lower the temperature and the still basin.