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Modified paraffin wax for impregnation of composite wax powder laser sintered molded parts

A laser sintering molding and compounding wax technology is applied in the field of modified paraffin, which can solve the problems of paraffin wax melting point being too high, bad viscosity-temperature characteristics, and high melt viscosity, and achieves the effects of improved strength, simple preparation method and high strength

Active Publication Date: 2017-09-26
太原纵横海威科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2. The melting point of paraffin wax should not be too high. If the melting point is too high, the composite wax powder laser sintered parts will be deformed or collapsed due to high temperature when they are dipped in wax.
Among these products, there is no one that is particularly suitable for dipping wax into composite wax powder laser sintered parts. The varieties that meet the melting point tend to have relatively high melt viscosity, and the viscosity-temperature characteristics are not good, and the viscosity changes greatly with temperature.

Method used

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  • Modified paraffin wax for impregnation of composite wax powder laser sintered molded parts
  • Modified paraffin wax for impregnation of composite wax powder laser sintered molded parts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take 300 g of No. 58 fully refined paraffin wax plate, break it into small pieces and put it into a spherical flask, add 30 g of decahydronaphthalene, 15 g of stearic acid and 1.5 g of sodium dodecylbenzenesulfonate in sequence. Put the spherical flask into a heat-collecting constant temperature magnetic stirrer for heating in a water bath. When the temperature in the flask reaches 80°C, start the stirrer under nitrogen-tight conditions to stir, and mix at a speed of 300r / min for 5min to mix the ingredients. uniform. After 2 hours of heat preservation, the sample was cooled with water, and when the temperature dropped to 65°C, the sample was poured out, and the modified paraffin was obtained after complete cooling.

[0022] The modified paraffin wax in this embodiment has a melting point of about 59° C., and a melt viscosity of 3-4 Pa·s in the wax dipping temperature range of 62-66° C. The bending strength of the composite wax powder laser sintered molded part after th...

Embodiment 2

[0024] Take 300g of No. 58 fully refined paraffin wax plate, break it into small pieces and put it into a spherical flask, add 40g of decahydronaphthalene, 25g of stearic acid and 3g of sodium dodecylbenzenesulfonate in sequence. Put the spherical flask into a heat-collecting constant temperature magnetic stirrer for heating in a water bath. When the temperature in the flask reaches 75°C, start the stirrer under nitrogen-tight conditions to stir, and mix at a speed of 500r / min for 5min to mix the ingredients. uniform. After 3 hours of heat preservation, the sample was cooled with water, and when the temperature dropped to 65°C, the sample was poured out, and the modified paraffin was obtained after complete cooling.

[0025] The modified paraffin wax in this embodiment has a melting point of about 59° C., and a melt viscosity of 2.5˜3 Pa·s in the wax immersion temperature range of 62˜66° C. The bending strength of the composite wax powder laser sintered molded part after the ...

Embodiment 3

[0027] Take 300g of No. 58 fully refined paraffin wax plate, break it into small pieces and put it into a spherical flask, add 45g of decahydronaphthalene, 30g of stearic acid and 4.5g of sodium dodecylbenzenesulfonate in sequence. Put the spherical flask into a heat-collecting constant temperature magnetic stirrer for heating in a water bath. When the temperature in the flask reaches 80°C, start the stirrer under nitrogen-tight conditions to stir, and mix at a speed of 500r / min for 5min to mix the ingredients. uniform. After 3 hours of heat preservation, the sample was cooled with water, and when the temperature dropped to 65°C, the sample was poured out, and the modified paraffin was obtained after complete cooling.

[0028] The modified paraffin wax in this embodiment has a melting point of about 59° C., and a melt viscosity of 2.3˜2.7 Pa·s in the wax immersion temperature range of 62˜66° C. The bending strength of the composite wax powder laser sintered molded part after ...

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Abstract

The invention discloses modified paraffin wax for impregnation of a compound wax powder laser sintering molded part. The modified paraffin wax is obtained by adding 10-15 parts by weight of decalin, 5-10 parts by weight of stearic acid and 0.5-1.5 parts by weight of sodium dodecyl benzene sulfonate into 100 parts by weight of No.58 fully refined paraffin wax, and mixing and melting uniformly. The modified paraffin wax disclosed by the invention is low in melting point, small in melting viscosity and good in viscosity-temperature property. By adopting the modified paraffin wax disclosed by the invention to perform wax-impregnated after treatment on the compound wax powder laser sintering molded part, the strength and surface finish quality of the compound wax powder laser sintering molded part can be obviously improved, and requirements of precision casting can be met.

Description

technical field [0001] The invention relates to a modified paraffin, in particular to a modified paraffin specially used for post-processing composite wax powder laser sintered molded parts, and also relates to a preparation method of the modified paraffin. Background technique [0002] CN 102850808A discloses a composite wax powder molding material for laser sintering and its preparation method. The composite wax powder molding material can better improve the shrinkage, warpage and other problems of ordinary wax powder during laser sintering. The dimensional accuracy of the sintered parts has been greatly improved. The linear shrinkage of the wax powder laser sintered molded parts is only 0.3-0.6%, and the size is stable, which can meet the production of high-precision, large-size wax models and wax models. However, the molded parts made by laser sintering of the composite wax powder molding material have relatively low strength, the bending strength is only about 1.8Pa, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L91/06C08K5/01C08K5/09C08K5/42
CPCC08K5/01C08K5/09C08K5/42C08L91/06
Inventor 王建宏曹亚峰李婧张格
Owner 太原纵横海威科技有限公司