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Thermosetting phosphate casting binder as well as preparation method and application method thereof

A technology of phosphate and binder, which is applied in the direction of casting molding equipment, casting molds, manufacturing tools, etc., can solve the problems of slow heating and curing speed, poor moisture resistance of sand molds, etc., achieve fast curing speed, fast hardening, and improve performance Effect

Active Publication Date: 2018-01-16
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Phosphate binder, as a green and environmentally friendly binder, has the characteristics of non-toxic, harmless and good collapsibility, but compared with traditional organic resin binders, it has slower heating and curing speed, and the sand mold is resistant to moisture absorption after curing. Disadvantages such as poor sex

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0026] Weigh 342g of 85% industrial phosphoric acid, 60g of aluminum hydroxide powder, 6g of boric acid, 4.8g of citric acid, 2.04g of silicic acid, 1.14g of PVP, 8.28g of magnesium carbonate, 31.2g of magnesium chloride, 0.54g of KH550, and 144g of water ;

[0027] Preparation steps:

[0028] 1. Add 342g of industrial phosphoric acid and 60g of aluminum hydroxide powder into the three-port reaction kettle, turn on the stirrer and heater, and slowly heat to 180-200°C;

[0029] 2. After the reaction in the reactor is completed and the solution becomes transparent, add 6g of boric acid and 4.8g of citric acid into the reactor, and continue to stir and react until the solution in the reactor becomes transparent. This process takes about 15 minutes;

[0030] 3. Add 2.04g of silicic acid, continue to stir for about 15 minutes, the silicic acid powder dissolves, and the solution in the reaction kettle becomes transparent;

[0031] 4. Add KH550 0.54g and stir for 5 minutes;

[003...

example 2

[0041] Weigh 330g of 85% industrial phosphoric acid, 60g of aluminum hydroxide powder, 7.8g of boric acid, 10.14g of citric acid, 1.14g of silicic acid, 1.74g of PVP, 11.64g of magnesium carbonate, 39g of magnesium chloride, 0.54g of KH570, and 138g of water gram;

[0042] Preparation steps:

[0043] 1. Add 330g of industrial phosphoric acid and 60g of aluminum hydroxide powder into the three-port reaction kettle, turn on the stirrer and heater, and slowly heat to 180-200°C;

[0044] 2. After the reaction in the reactor is completed and the solution becomes transparent, add 7.8g of boric acid and 10.14g of citric acid into the reactor, and continue to stir until the solution in the reactor becomes transparent. This process takes about 15 minutes;

[0045] 3. Add 1.14g of silicic acid, continue to stir for about 15 minutes, the silicic acid powder dissolves, and the solution in the reaction kettle becomes transparent;

[0046] 4. Add KH570 0.54g and stir for 5 minutes;

[00...

example 3

[0056]Weigh 324g of 85% industrial phosphoric acid, 54g of aluminum hydroxide powder, 9.6g of boric acid, 14.88g of citric acid, 1.68g of silicic acid, 2.28g of PVP, 15.42g of magnesium carbonate, 33g of magnesium chloride, 1.14g of KH550, and 144g of water gram;

[0057] Preparation steps:

[0058] 1. Add 324g of industrial phosphoric acid and 54g of aluminum hydroxide powder into the three-port reaction kettle, turn on the stirrer and heater, and slowly heat to 180-200°C;

[0059] 2. After the reaction in the reactor is completed and the solution is transparent, add 9.6g of boric acid and 14.88g of citric acid into the reactor, and continue to stir until the solution in the reactor is transparent. This process takes about 15 minutes;

[0060] 3. Add 1.68g of silicic acid, continue to stir for about 15 minutes, the silicic acid powder dissolves, and the solution in the reaction kettle becomes transparent;

[0061] 4. Add 1.14g of KH550 and stir for 5 minutes;

[0062] 5. A...

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Abstract

The invention provides a thermosetting phosphate casting binder. The thermosetting phosphate casting binder is prepared from the following raw materials in percentage by weight: 50 percent to 57 percent of industrial phosphoric acid, 9 percent to 12 percent of aluminum hydroxide, 0.75 percent to 2.18 percent of boric acid, 0.66 percent to 2.48 percent of citric acid, 0.075 percent to 0.57 percentof silicic acid, 0.075 percent to 0.47 percent of a water-soluble high molecular material, 0.75 percent to 3.53 percent of magnesium carbonate, 3.5 percent to 6.5 percent of magnesium chloride, 0.035percent to 0.19 percent of a silane coupling agent and the balance of pure water. According to the thermosetting phosphate casting binder provided by the invention, organic acid, inorganic acid and the water-soluble high molecular material are used for modifying a phosphoric acid binder, so that the aim of remarkably improving the performance of heat-curing sand by the phosphoric acid binder is realized; the thermosetting phosphate casting binder provided by the invention has the advantages of high binding strength, rapid curing speed and good moisture resistance and has a wide application prospect in a casting industry.

Description

technical field [0001] The invention belongs to the field of foundry industry, and in particular relates to a thermosetting phosphate foundry binder and its preparation and use method. Background technique [0002] At present, the foundry industry widely uses thermal curing (coated sand) or triethylamine cold box method to manufacture sand cores or sand molds. Since organic binders are used, neither of them is environmentally friendly. Whether it is normal temperature or heating curing process Both have odor and are harmful to the human body. During the casting process of molten metal, the resin burns to produce a large amount of harmful gas, which is a material that is gradually banned from use. [0003] Phosphate binder, as a green and environmentally friendly binder, has the characteristics of non-toxic, harmless and good collapsibility, but compared with traditional organic resin binders, it has slower heating and curing speed, and the sand mold is resistant to moisture ...

Claims

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Application Information

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IPC IPC(8): B22C1/16
Inventor 张友寿刘栋夏露黄晋李四年
Owner HUBEI UNIV OF TECH
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