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Precisive ornament casting moulding material

A technology of precision casting and mold material, applied in the field of mold material for precision casting of jewelry, can solve the problems of poor fluidity, inability to meet the requirements of low cost, poor reusability, etc., and achieve good reusability and stable size , the effect of low linear shrinkage

Active Publication Date: 2007-11-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the addition of fillers, its fluidity becomes poor, and its reusability is not good, so it cannot meet the low-cost requirements of the current investment casting market competition.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0033] Example: (the following are all expressed in weight percent)

[0034] experiment method

[0035] The following test method is a general test method for precision casting moulding materials used in the examples.

[0036] Drop melting point GB / T 8036

[0037] Softening point GB / T 4507

[0038] Penetration GB / T 4985

[0039] Kinematic viscosity GB / T 265

[0040] Bending strength GB / T 14235.2

[0041] Linear shrinkage rate GB / T 14235.4

[0042] Ash GB / T 508

Embodiment 1

[0045] 85 # Hydrogenated microcrystalline wax, dropping point 85.1℃ (Fushun Petrochemical Research Institute) 25%

[0046] 58 # Semi-refined paraffin, melting point 58.2 ℃ (Fushun Petroleum No. 1 Plant) 20%

[0047] Petroleum resin, softening point 100℃ (Shanghai Jinsen Petroleum Resin Company) 45%

[0048] High pressure polyethylene, average molecular weight 22000 (Fushun Ethylene Chemical Plant) 4%

[0049] Carnauba wax, drop melting point 80 ℃ (Brazil MOACIR COSTA company) 6%

Embodiment 2

[0051] 80 # Hydrogenated microcrystalline wax, dropping point 80.8℃ (Fushun Petrochemical Research Institute) 20%

[0052] 58 # Fully refined paraffin, melting point 58.2 ℃ (Fushun Petroleum No. 1 Plant) 20%

[0053] Polymerized rosin, softening point of ring and ball method 100 ℃ (Wuzhou Arakawa Chemical Co., Ltd.) 10%

[0054] Petroleum resin, softening point 100℃ (Nanjing Yangzi Eastman Chemical Co., Ltd.) 40%

[0055]EVA (melt index 28, DuPont, USA) and high pressure polyethylene (average molecular weight 22000, Fushun Ethylene Chemical Plant) weight ratio 1:1 6%

[0056] Sichuan wax, drop melting point 72 ℃ (Cangzhou Forest Wax Co., Ltd.) 4%

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Abstract

A precision-casting mold material for ornament consists of hydrogenated microcrystalline wax, paraffin, petroleum resin, high-molecular polymer, mineral wax and animal and vegetable wax. It has better bending strength, surface hardness, thermal stability, fluidity, reutilization and less linear shrinkage rate. It can be used for gold and silver ornaments.

Description

technical field [0001] The invention relates to a mould material for precision casting of ornaments, which is particularly suitable for the mould material for making models in the precision casting of gold and silver ornaments and other precision castings of ornaments. Background technique [0002] With the development of the national economy and the improvement of people's living standards, the development of the jewelry industry is showing great vigor. There are more and more styles and styles, and the shapes are more and more complex, which puts forward higher requirements for the mold materials: high strength, shrinkage Small, good fluidity, good toughness, etc. Existing mold materials for precision casting of jewelry, such as the ultra-fine mold materials for jewelry investment casting introduced in CN00119620.0 patent, are mainly composed of paraffin wax, other waxes, modified rosin resin, high molecular polymer and cosolvent. The strength is high, but the shrinkage r...

Claims

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Application Information

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IPC IPC(8): C08L91/06B22C7/02
Inventor 杨光李莉
Owner CHINA PETROLEUM & CHEM CORP
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