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Foamed plastic binder for lost foam casting of valve

A technology of lost foam casting and foamed plastics, which is used in casting molding equipment, casting molds, manufacturing tools, etc., can solve the problems of increased pouring gas residue, dents on the surface of castings, poor model bonding, etc., and achieves good bonding effect. , The effect of low production cost and rapid gasification

Inactive Publication Date: 2016-02-03
HEXIAN KEJIA VALVE CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the binder is not properly selected during model preparation, or the amount of binder used is too much or too little, it will not only affect the efficiency of mold making, but also increase the amount of gas generated during pouring and residues after burning, as well as the combination of various parts of the model Defective, resulting in pitting or burr defects on the surface of the casting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Add 7 parts of nano-alumina and 42 parts of n-butanol to 70 parts of polymerized rosin, mix well, and microwave at a microwave frequency of 2450MHz and a power of 600W for 15 minutes, and then add 16 parts of Shuangmao after the temperature drops to 70°C Laimide and 10 parts of sodium polyacrylate were incubated and stirred for 30 minutes to obtain material I;

[0018] (2) Add 14 parts of modified starch to 60 parts of water for beating, and after forming a uniform slurry, add 7 parts of palm wax and 5 parts of squash gum, heat up to 70°C and keep stirring for 15 minutes to obtain material II;

[0019] (3) Add 12 parts of calcined kaolin and 10 parts of gypsum powder to the material II, ultrasonically treat it at an ultrasonic frequency of 40 kHz and a temperature of 50 °C for 20 minutes, then add material I, 10 parts of maltodextrin, 4 parts of dibutyltin dilaurate and 2 parts of sodium citrate, and continue ultrasonic treatment for 10-15 minutes to obtain the bind...

Embodiment 2

[0023] (1) Add 8 parts of nano-alumina and 45 parts of n-butanol to 75 parts of polymerized rosin, mix well and then microwave at a microwave frequency of 2450MHz and a power of 600W for 15min, and then add 18 parts of Shuangmao after the temperature drops to 80°C Laimide and 12 parts of sodium polyacrylate were incubated and stirred for 30 minutes to obtain material I;

[0024] (2) Add 15 parts of modified starch to 65 parts of water for beating. After forming a uniform slurry, add 8 parts of palm wax and 7 parts of squash gum, heat up to 70°C and keep stirring for 20 minutes to obtain material II;

[0025] (3) Add 13 parts of calcined kaolin and 10 parts of gypsum powder to the material II, ultrasonically treat it at an ultrasonic frequency of 40 kHz and a temperature of 50 °C for 20 minutes, then add material I, 12 parts of maltodextrin, 5 parts of dibutyltin dilaurate and 3 parts of sodium citrate, and continue ultrasonic treatment for 15 minutes to obtain the binder.

[...

Embodiment 3

[0029] (1) Add 10 parts of nano-alumina and 50 parts of n-butanol to 80 parts of polymerized rosin, mix evenly and microwave at a microwave frequency of 2450MHz and a power of 600W for 15min, and then add 18 parts of Shuangmao after the temperature drops to 80°C Laimide and 10 parts of sodium polyacrylate were incubated and stirred for 30 minutes to obtain material I;

[0030] (2) Add 18 parts of modified starch to 70 parts of water for beating. After forming a uniform slurry, add 9 parts of palm wax and 6 parts of squash gum, heat up to 70°C and keep stirring for 20 minutes to obtain material II;

[0031] (3) Add 12 parts of calcined kaolin and 12 parts of gypsum powder to the material II, ultrasonically treat it at an ultrasonic frequency of 40kHz and a temperature of 50°C for 20min, then add material I, 13 parts of maltodextrin, 5 parts of dibutyltin dilaurate and 4 parts of sodium citrate, and continue ultrasonic treatment for 15 minutes to obtain the binder.

[0032] Pre...

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PUM

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Abstract

The invention discloses a foamed plastic binder for lost foam casting of a valve, and relates to the technical field of valve manufacturing. The foamed plastic binder is made from, by weight, 70-80 parts of polymerized rosin, 15-20 parts of bismaleimide, 13-18 parts of modified starch, 11-15 parts of calcined kaolin, 10-13 parts of sodium polyacrylate, 10-13 parts of maltodextrin, 8-12 parts of gypsum powder, 6-10 parts of nanometer aluminium oxide, 6-10 parts of palm wax, 5-8 parts of sesbania gum, 3-6 parts of dibutyltin dilaurate, 2-4 parts of sodium citrate, 40-50 parts of n-butyl alcohol and 60-70 parts of water. The foamed plastic binder has the characteristics that the production cost is low, the binding effect is good, the use quantity is low and the gas-forming amount is low; besides, gasification is fast, no residue is generated, and the foamed plastic binder is suitable for binding foamed plastic for lost foam casting of the valve.

Description

Technical field: [0001] The invention relates to the technical field of valve manufacturing, in particular to a foam plastic adhesive for valve lost foam casting. Background technique: [0002] Lost foam casting is to bond and combine foam models similar in size and shape to castings to form model clusters. After brushing refractory paint and drying, they are buried in dry quartz sand for vibration molding, and poured under negative pressure to vaporize the model. A new casting method in which metal occupies the position of the model, solidifies and cools to form a casting. Compared with traditional casting technology, lost foam casting has the characteristics of good casting quality, low cost, high dimensional accuracy, and smooth surface. It can realize large-scale and mass production, reduce labor intensity and reduce energy consumption. [0003] In the lost foam casting process, the preparation of the foam plastic model is particularly important. If the binder is not p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/16B22C1/20B22C1/26B22C1/18
Inventor 黎宏黎思瑶
Owner HEXIAN KEJIA VALVE CASTING
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