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A filler type investment casting wax based on lipophilic micron graphite and preparation method thereof

An investment casting and lipophilic technology, applied in the direction of casting molding equipment, etc., can solve the problems of affecting the reaction accuracy of castings, affecting product quality, poor thermal conductivity, etc., achieve small ash content, meet high dimensional accuracy and high surface quality, The effect of improving thermal conductivity

Active Publication Date: 2019-07-23
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, organic acids such as fumaric acid, adipic acid, terephthalic acid, isophthalic acid, etc., have high thermal conductivity. After adding, even a very thick area can make the mold material cool down quickly, but The disadvantage is that it can react with the shell material and affect the reaction accuracy of the casting
In addition, although inert polymers such as polystyrene and polystyrene propylene do not react with shell materials, their thermal conductivity is worse than that of organic acids.
In addition, since the filling material exists in the form of particles in the mold material, it is easy to settle after melting, which affects the product quality

Method used

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  • A filler type investment casting wax based on lipophilic micron graphite and preparation method thereof

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preparation example Construction

[0029] Preferably, the preparation method of lipophilic micron graphite comprises the following steps:

[0030] 1) adding micron graphite into water for ultrasonic dispersion, drying to obtain micron graphite powder;

[0031] 2) adding micron graphite powder into an organic solvent, then adding an oily wetting agent, ultrasonically dispersing, and drying to obtain lipophilic micron graphite.

[0032] Preferably, in step 1) of the method for preparing lipophilic micron graphite, the mass ratio of micron graphite to water is (1-10): (90-99); the temperature of the water is 60-70°C, and the ultrasonic dispersion time is 20 ~30min; the drying temperature is 110~130℃, and the drying time is 12~24h.

[0033] Preferably, in step 1) of the method for preparing lipophilic micron graphite, the micron graphite is micron cryptocrystalline graphite.

[0034] Preferably, in step 2) of the method for preparing lipophilic micron graphite, the mass ratio of micron graphite powder, organic so...

preparation Embodiment 1

[0046] 1) Add 10 parts by mass of cryptocrystalline graphite with a particle size of 30 microns to 90 parts by mass of water (at a temperature of 70°C) for ultrasonic dispersion for 30 minutes to remove acid radical ions and metals remaining during the processing of micron graphite ion, filtered, and baked in an oven at 130°C for 24 hours to obtain micron graphite powder;

[0047] 2) Add 10 parts by mass of micron graphite powder to 90 parts by mass of cyclohexane, add 1 part by mass of paraffin oil, ultrasonically disperse for 60 minutes, filter, and bake in an oven at 90°C for 8 hours to remove the organic solvent , to obtain lipophilic micron graphite.

[0048] Add 10 parts by mass of lipophilic micron graphite obtained by the above preparation method to 90 parts by mass of paraffin, and ultrasonically disperse at 100° C. for 60 minutes to obtain a dispersion. After testing, the dispersion maintains good dispersion stability without delamination after 800 high and low temp...

preparation Embodiment 2

[0050] The preparation method is the same as the preparation example 1 of lipophilic micron graphite, the only difference is that the organic solvent is acetone. After testing, the dispersion maintains good dispersion stability without delamination after 800 high and low temperature cycles (20°C-100°C-20°C).

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Abstract

The invention discloses a filling type investment casting wax based on lipophilic micron graphite and a preparation method thereof. A filler type investment casting wax based on lipophilic micron graphite comprises basic components, the basic components are composed of the following raw materials in mass percentage: 40-60% of paraffin wax, 6-10% of rosin or rosin resin, 3-10% of PE wax, 25-35% of petroleum resin, 5-15% of lipophilic micron graphite, and 0-0.5 wt% of pigments as basic components. At the same time, the preparation method of the filling type investment casting wax based on lipophilic micron graphite is also disclosed. The filling type investment casting wax of the present invention has moderate softening point, small penetration and linear shrinkage, high bending strength and small ash content, which can well meet the requirements of high dimensional accuracy and high surface quality of precision castings, and meet the requirements of actual production needs.

Description

technical field [0001] The invention relates to a filling type investment casting wax based on lipophilic micron graphite and a preparation method thereof. Background technique [0002] Lost wax investment casting method, also known as platinum plating and waxing process. In lost-wax investment casting, a refractory material is wrapped around a wax pattern, which is then heated, melted, drained, and then applied to the desired object. [0003] Investment casting is made by repeatedly dipping several layers of refractory coating on the surface of the fusible mold, and after sanding, drying and hardening layer by layer, the investment mold is melted away by heating methods such as steam and hot water. A casting method in which the integral shell is fired at a high temperature and poured to obtain a casting. Because the castings obtained by this method have precise dimensions, clear edges and corners, smooth surfaces, and are close to the final shape of zero pendants, it is a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C7/02C08L91/06C08L93/04C08L23/06C08L57/02C08K9/04C08K3/04
CPCB22C7/02C08L91/06C08L2205/035C08L93/04C08L23/06C08L57/02C08K9/04C08K3/04
Inventor 徐勇军王勇蔡卓弟李冰天尹辉斌谭炜恒陈文谦陈晓婷谭世芝邵斯茹
Owner DONGGUAN UNIV OF TECH
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