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Adhesive for casting and preparation method thereof

A binder and polyisocyanate technology, applied in casting molding equipment, casting molds, manufacturing tools, etc., can solve the problems of limiting binders, high-temperature heat-resistant time of cores and poor high-temperature compressive strength, etc., to achieve long-term high-temperature Effects of heat-resistant time and high-temperature heat-resistant strength

Active Publication Date: 2014-11-26
JINAN SHENGQUAN GROUP SHARE HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the core strength prepared by this casting core binder provided by the prior art is relatively high, the high-temperature heat-resistant time and high-temperature compressive strength of the core prepared by this binder are poor, which limits The application of this adhesive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0048] In the present invention, based on the parts by weight of the benzyl ether phenolic resin, the parts by weight of the graphene is preferably 0.1 to 10 parts, more preferably 0.5 to 8 parts, most preferably 1 part ~ 6 parts, most preferably 2 ~ 4 parts. In the present invention, the raw material for preparing graphene is preferably biomass carbon source. In the present invention, the preparation method of described graphene preferably comprises the following steps:

[0049] 1), under the action of a catalyst, the biomass carbon source is subjected to catalytic treatment to obtain a first intermediate product, and the catalyst includes one or more of manganese chloride salts, iron compounds, cobalt compounds and nickel compounds Several;

[0050] 2) Under the condition of protective gas, the first intermediate product is heated from the first temperature to the second temperature and then kept warm to obtain the second intermediate product, the first temperature is 20°C...

Embodiment 1

[0089] At 90° C., hydrolyzing corncobs in sulfuric acid for 10 minutes to obtain lignocellulose, the mass of the sulfuric acid being 3% of the mass of the corncobs;

[0090] At 70°C, the lignocellulose was subjected to acidic sulfite treatment for 1 hour to obtain porous cellulose, the pH value in the acidic sulfite treatment process was 1, the acid was sulfuric acid, and sulfite It is magnesium sulfite, the quality of the sulfuric acid is 4% of the quality of the lignocellulose, and the liquid-solid ratio is 2:1.

[0091] The obtained porous cellulose is bleached with hydrogen peroxide, the mass of the hydrogen peroxide is 5% of the mass of the porous cellulose, the bleaching temperature of the hydrogen peroxide bleaching is 100° C., and the bleaching time is 5 hours.

[0092] Stir the porous cellulose and manganese chloride at 20°C for 2 hours for catalytic treatment, the mass ratio of the manganese chloride and porous cellulose is 0.01:1; Drying at a low temperature to obt...

Embodiment 2

[0096] At 180°C, hydrolyzing corncobs in nitric acid for 10 hours to obtain lignocellulose, the mass of the nitric acid being 20% ​​of the mass of the corncobs;

[0097] At 180°C, the lignocellulose was subjected to acidic sulfite treatment for 6 hours to obtain porous cellulose, the pH value during the acidic sulfite treatment process was 7, the acid was sulfuric acid, and sulfite It is sodium sulfite, the quality of the sulfuric acid is 30% of the quality of the lignocellulose, and the liquid-solid ratio is 20:1.

[0098] The porous cellulose is bleached with hydrogen peroxide, the mass of the hydrogen peroxide is 5% of the mass of the porous cellulose, the bleaching temperature of the hydrogen peroxide bleach is 100° C., and the bleaching time is 5 hours.

[0099] Stir the porous cellulose and ferric nitrate at 180°C for 10 hours for catalytic treatment, the mass ratio of ferric nitrate and porous cellulose is 2:1; dry the obtained catalytically treated product at 120°C , ...

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Abstract

The invention provides an adhesive for casting. The adhesive is prepared from benzyl ether phenolic resin, polyisocyanate, epoxy resin, acrylic ester, an organic compound and graphene through reaction, wherein the organic compound comprises one or several of a diacid diol ester type compound, an alcohol type compound and a hydrocarbon compound. The invention provides a preparation method for the adhesive for casting. The preparation method comprises the steps of performing reaction on benzyl ether phenolic resin, polyisocyanate, epoxy resin, acrylic ester, an organic compound and graphene to obtain the adhesive for casting; and the organic compound comprises one or several of the diacid diol ester type compound, the alcohol type compound and the hydrocarbon compound. A casting mold or a casting core prepared by the adhesive for casting, which is provided by the invention, is relatively long in high-temperature heat resistance time and relatively high in high-temperature heat resistance strength.

Description

technical field [0001] The invention relates to the technical field of binders, in particular to a casting binder and a preparation method thereof. Background technique [0002] In the foundry industry, the cold box method is usually used to prepare the core. The cold box method refers to the process of catalyzing the resin sand at room temperature with a gas or aerosol catalyst to achieve rapid solidification. The cold box method can be divided into amine method, SO 2 - Epoxy method, CO 2 Resin method and methyl formate method. Among them, SO 2 - The core sand prepared by the epoxy resin method can be used for a longer period of time, and solves production problems such as core box fouling and mold sticking, and is suitable for mass production. [0003] The Chinese patent with the application number 201010176020.6 discloses a binder for casting cores. Put 10 g of benzyl ether phenolic resin into the reactor, heat and stir, and dehydrate under vacuum (vacuum degree is 15...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/22
Inventor 唐一林祝建勋许增彬
Owner JINAN SHENGQUAN GROUP SHARE HLDG
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