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Liquid curing agent for phosphate foundry binder and its preparation method

A technology of curing agent and binder, which is applied in the direction of casting molding equipment, casting molds, manufacturing tools, etc., and can solve the problems of affecting the suspension stability of suspension, inoperability, and adverse effects of curing agent performance.

Active Publication Date: 2017-07-04
WUHAN RUIMING AUTOMOTIVE PARTS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

From the content of the invention, the invented suspension solidifying agent has the following problems: the one is that the suspension solidifying agent will thicken after being stored for a period of time, thus affecting the dispersion effect of the solidifying agent during use; The hardening phenomenon exists in the curing agent, and it is necessary to add citric acid to prevent the hardening problem, but if the amount of citric acid added is too high, it will have a certain adverse effect on the performance of the curing agent; the third is that the reaction speed of the suspension curing agent and the binder is too fast, and the molding sand The usable time is only 10 minutes, which is very limited in practical application, especially when making large molds, it may take more than 30 minutes from sand mixing to molding completion, so when the reaction speed is too fast, it is impossible to operate
Another problem with fast curing speed is low curing strength
[0004] The reason for analyzing the problems in the above-mentioned patents is that in this manufacturing method, the solid magnesia powder particles are not fully covered by the suspending agent molecules, and even the solid magnesia particles are separated from the suspending agent, which not only affects the suspension. Suspension stability, and when mixed with the binder, the curing agent molecules and the binder molecules contact quickly, resulting in a fast curing reaction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Preparation method of liquid curing agent for phosphate foundry binder:

[0017] 1) Take by weighing 520 grams of metallurgical magnesia powder, 464 grams of ethanol and 16 grams of polyvinyl butyral respectively, for subsequent use; the particle size of the metallurgical magnesia powder is 800 mesh, and the viscosity of the polyvinyl butyral is 250 flow second;

[0018] 2) First put the metallurgical magnesia powder and polyvinyl butyral into the wheel-type mixer with a sealed cover, cover the sealed cover to prevent bleaching, start the machine and mix for 5 minutes to make the two initially mixed uniform;

[0019] 3) stop the machine, then add 170 grams of ethanol into the mixer, cover the sealing cover, start the mixer to work, after 2 hours of mixing time, the material is discharged to obtain a paste;

[0020] 4) Put the ground paste into a container with a stirring device, add the remaining 294 grams of ethanol, start the machine and stir for 20 minutes at a sti...

Embodiment 2

[0025] Preparation method of liquid curing agent for phosphate foundry binder:

[0026] 1) Take by weighing 537 grams of metallurgical magnesia powder, 450 grams of ethanol and 13 grams of polyvinyl butyral respectively, and set aside; the particle size of the metallurgical magnesia powder is 900 mesh, and the viscosity of the polyvinyl butyral is 300 flow second;

[0027] 2) Put metallurgical magnesia powder and polyvinyl butyral into the wheel-type mixer with a sealed cover, cover the sealed cover to prevent bleaching, start the machine and mix for 7 minutes to make the two initially mixed uniform;

[0028] 3) stop the machine, then add 177 grams of ethanol into the mixer, cover the sealing cover, start the mixer to work, after 2 hours of mixing time, the paste is discharged;

[0029] 4) Put the crushed paste into a container with a stirring device, add the remaining 273 grams of ethanol, start the machine and stir for 25 minutes at a stirring speed of 300 rpm to obtain a ...

Embodiment 3

[0034] 1) Take by weighing 555 grams of metallurgical magnesia powder, 434 grams of ethanol and 11 grams of polyvinyl butyral respectively, and set aside; the particle size of the metallurgical magnesia powder is 1000 mesh, and the viscosity of the polyvinyl butyral is 280 flow second;

[0035] 2) Put the metallurgical magnesia powder and polyvinyl butyral into the wheel-type mixer with a sealed cover, cover the sealed cover to prevent bleaching, start the machine and mix for 9 minutes to make the two initially mixed uniform;

[0036] 3) stop the machine, then add 183 grams of ethanol into the mixer, cover the sealing cover, start the mixer to work, after 2 hours of mixing time, the material is discharged to obtain a paste;

[0037] 4) Put the ground paste into a container with a stirring device, add the remaining 251 grams of ethanol, start the machine and stir for 28 minutes at a stirring speed of 300 rpm to obtain a liquid curing agent, and put it into a container with a s...

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Abstract

The invention discloses a liquid curing agent for a phosphate casting binder and a preparation method thereof. The liquid curing agent is composed of: 52%-55.5% of metallurgical magnesia powder, 43.4-46.4% of ethanol, and 1.1-1.6% of polyvinyl butyral. The preparation method comprises the steps of: firstly subjecting metallurgical magnesia powder and polyvinyl butyral to seal mixing milling for 5-10min, mixing them evenly preliminarily; then adding ethanol accounting for 30-35% of the weight of metallurgical magnesia powder, and carrying out seal mixing milling for 2h to obtain a paste; and then adding the remaining ethanol and conducting stirring at a speed of 300 rpm for 20-30min, thus obtaining the liquid curing agent. The 2h suspension rate of the curing agent reaches 100%, does not harden after 6 months of storage without citric acid, and when the curing agent is used for manufacturing self-hardened phosphate sand, the usable time of molding sand reaches over 30min, and after sand mold curing, the tensile strength is greatly improved.

Description

technical field [0001] The invention relates to a curing agent for phosphate casting binders, in particular to a liquid curing agent for phosphate casting binders and a preparation method thereof. Background technique [0002] Phosphate is a new type of green and environmentally friendly casting binder, but at present there is only a matching magnesia powder powder curing agent. Powder curing agent is not as convenient as liquid curing agent in terms of quantification, transmission, storage, etc., especially when mixing sand in a roller sand mixer, it is easy to cause dust pollution. [0003] The Chinese invention patent "Preparation Method and Application of Phosphate Inorganic Casting Binder Suspension Curing Agent" (Patent No. 200910063118.3) discloses a liquid curing agent. From the content of the invention, the invented suspension solidifying agent has the following problems: the one is that the suspension solidifying agent will thicken after being stored for a period ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C1/16
Inventor 张友寿夏露黄晋李四年龙威晏骏玮
Owner WUHAN RUIMING AUTOMOTIVE PARTS