Superfine emulsified wax molding agent suitable for cemented carbide water-based mixture and preparation method

A cemented carbide and mixed material technology, applied in the field of powder metallurgy, can solve the problems of emulsifier influence, emulsification wax breaking, unenvironmental protection, etc., and achieve the effect of reducing the difficulty of unloading and improving the efficiency of ball milling.

Active Publication Date: 2019-04-19
XIAMEN TUNGSTEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the production of traditional cemented carbide mixtures at home and abroad uses organic solvents such as alcohol, cyclohexane, and acetone as the wet grinding medium, and paraffin wax as the forming agent. This system has the disadvantages of environmental protection, safety, and high cost; When water is used as the wet grinding medium, the paraffin wax forming agent cannot be dispersed in water. This problem can be solved after emulsification of the paraffin wax. However, the existing emulsified wax formula and particle size are not suitable for the cemented carbide industry. The main reasons are: (1 ) The emulsifier in the emulsified wax formula contains elements that cannot be removed (such as Na, Cl, etc.), which will easily affect the properties of the alloy after sintering; (2) The emulsified wax contains acidic surfactants, and the acidic aqueous solution will make the mixture The oxidation of Co powder is aggravated during the ball milling process; (3) The emulsifier in the emulsified wax accounts for a relatively high proportion of paraffin wax, adding too much emulsifier affects the compacting performance and increases the difficulty of completely removing the molding agent; (4) the current The particle size distribution of the emulsified wax is wide and the average particle size is large. If there are particles larger than 10um in the emulsified wax, it is easy to form large alloy holes after sintering, which will affect the properties of the alloy.
[0003] The particle size of the emulsified wax used to prepare the water-based cemented carbide mixture is relatively coarse, and it needs to be added during the ball milling process. Although ball milling for a long time can further refine the particle size of the emulsified wax, it is easy to cause the emulsified wax to break. Alloy pores are likely to be caused by the emulsified wax particle being too coarse

Method used

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  • Superfine emulsified wax molding agent suitable for cemented carbide water-based mixture and preparation method
  • Superfine emulsified wax molding agent suitable for cemented carbide water-based mixture and preparation method
  • Superfine emulsified wax molding agent suitable for cemented carbide water-based mixture and preparation method

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Effect test

Embodiment

[0024] An ultrafine emulsified wax forming agent suitable for cemented carbide water-based mixture and its preparation method according to the present invention, through the optimization and screening of emulsifier and emulsification process, a kind of ultrafine emulsified wax is prepared, which can be used in slurry ball milling Add directly to the mix.

[0025] A kind of ultra-fine emulsified wax forming agent suitable for cemented carbide water-based mixture of the present invention is made up of the following components by weight percentage:

[0026]

[0027] Further, the superfine emulsified wax molding agent suitable for cemented carbide water-based mixture is composed of the following components by weight percentage:

[0028]

[0029]

[0030] A kind of preparation method of the superfine emulsified wax molding agent that is applicable to cemented carbide water-based mixture of the present invention comprises the following steps:

[0031] Calculated by weight ...

Embodiment 1

[0042] Weigh 570g of paraffin (38wt.%), 97.5g of emulsifier (6.5wt.%) and 7.5g of emulsion stabilizer (0.5wt.%), set the temperature in a water bath to 85°C, and heat until the mixture is completely in solution , standby; another weigh 825g deionized water (55wt.%), placed in a water bath and heated to 85 ℃, standby; deionized water is poured into the mixture containing paraffin, and high-dispersion emulsification device is used to carry out high-speed emulsification of the solution Mechanical stirring, the stirring speed is adjusted to 10000r / min, and the stirring time is 30min; after the emulsification is completed, the emulsion is placed in the air and naturally cooled to room temperature.

[0043] Use a laser particle size analyzer to detect the particle size distribution of emulsified wax, such as figure 1 As shown, the results are: D(0.1) is 0.290um, D(0.5) is 0.671um, and D(0.9) is 1.281um.

[0044] Prepare a batch of 3kg water-based mixture with the conventional ball ...

Embodiment 2

[0046] Weigh 643.5g paraffin (42.9wt.%), 105g emulsifier (7wt.%) and 1.5g emulsion stabilizer (0.1wt.%), set the temperature in a water bath to 85°C, and heat until the mixture is completely in solution , for standby; another 750g deionized water (50wt.%) was weighed, placed in a water bath and heated to 85°C for standby; deionized water was poured into the mixture containing paraffin, and the solution was subjected to high-speed emulsification with a high-dispersion emulsification device. Mechanical stirring, the stirring speed is adjusted to 15000r / min, and the stirring time is 20min; after emulsification, the emulsion is placed in the air and naturally cooled to room temperature.

[0047] Use a laser particle size analyzer to detect the particle size distribution of emulsified wax, such as figure 2As shown, the results are: D(0.1) is 0.524um, D(0.5) is 0.628um, and D(0.9) is 0.752um.

[0048] Prepare a batch of 3kg water-based mixture with the conventional ball milling pr...

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Abstract

The invention discloses a superfine emulsifying wax forming agent suitable for a hard alloy water-based mixture and a preparing method of the superfine emulsifying wax forming agent. The superfine emulsifying wax forming agent comprises, by weight, 45-55% of deionized water, 36-48% of paraffin, 6.5-8.5% of emulgator and 0.1-1% of emulsion stabilizer. The preparing method for the superfine emulsifying wax forming agent comprises the steps that the weighed paraffin, emulgator and emulsion stabilizer are placed in a beaker to be heated till the weighed paraffin, emulgator and emulsion stabilizer are melted into liquid, the paraffin mixing liquid is stirred, in the stirring process, the heated deionized water is slowly poured into the paraffin mixing liquid, and the superfine emulsifying wax forming agent is obtained after emulsification. The average particle size of the superfine emulsifying wax forming agent is smaller than one micron, the particle size distribution is concentrated, the superfine emulsifying wax forming agent can be directly added, stirred and mixed after slurry ball grinding is finished, and the defects that due to long-time ball grinding of emulsifying wax, emulsion breaking happens, thick and high scale paraffin is precipitated, and a large alloy hole is formed after sintering are overcome.

Description

technical field [0001] The invention relates to the technical field of powder metallurgy, in particular to an ultrafine emulsified wax forming agent suitable for cemented carbide water-based mixture and a preparation method thereof. Background technique [0002] At present, the production of traditional cemented carbide mixtures at home and abroad uses organic solvents such as alcohol, cyclohexane, and acetone as the wet grinding medium, and paraffin wax as the forming agent. This system has the disadvantages of environmental protection, safety, and high cost; When water is used as the wet grinding medium, the paraffin wax forming agent cannot be dispersed in water. This problem can be solved after emulsification of the paraffin wax. However, the existing emulsified wax formula and particle size are not suitable for the cemented carbide industry. The main reasons are: (1 ) The emulsifier in the emulsified wax formula contains elements that cannot be removed (such as Na, Cl, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/00
Inventor 郑建平谢海唯李文强郭新营李玲艳吴冲浒肖满斗
Owner XIAMEN TUNGSTEN
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