Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Process for fabricating low nitrogen furan resin for steel casting

A production process and nitrogen furan technology are applied in the field of production technology of low nitrogen furan resin for cast steel, which can solve the problems of pores, pinholes, short use time of resin and high free formaldehyde content, and achieve the effect of improving strength

Active Publication Date: 2010-06-23
共享新材料(山东)有限公司
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current low-nitrogen and nitrogen-free resins for steel casting mainly have the following defects: the free formaldehyde content of the resin is high, which is released in large quantities during use, seriously polluting the working environment and harming the health; Castings produce pores; the higher the urea content in the resin, the higher the strength and the lower the product cost, but the amount of gas generated by the resin at high temperature is also large, and the possibility of defects such as pores and pinholes in the casting is also greater; the resin can be The use time is short, the final strength is low, and it cannot meet the requirements of the casting process

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Process for fabricating low nitrogen furan resin for steel casting
  • Process for fabricating low nitrogen furan resin for steel casting
  • Process for fabricating low nitrogen furan resin for steel casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0060] A kind of manufacture technology of low-nitrogen furan resin for cast steel, it is characterized in that: it comprises the following steps: optimal formula: formaldehyde (36.5%): 8-9 parts of urea: 3-5 parts of furfuryl alcohol: ≥85 parts of NaOH solution: 40% hydrochloric acid solution: 10% silane coupling agent: 0.2%

[0061] a. Feeding: Use a vacuum pump to suck the formaldehyde solution into the metering tank, close the discharge valve at the bottom of the reaction kettle, open the formaldehyde feed valve, add formaldehyde from the process formula, open the steam valve, start the mixer, add a certain amount of NaOH to adjust the pH of the solution To 7.5 ~ 8.5, then slowly add 92.6% of urea in the process formula, close the feed valve;

[0062] b. Heating and heating: when the temperature of the feed liquid rises to 35-45°C, use NaOH solution to adjust the pH value of the reaction solution to 8.7-9, open the reflux valve, and slowly raise the temperature for 60 minu...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
strengthaaaaaaaaaa
tensile strengthaaaaaaaaaa
Login to View More

Abstract

The invention relates to a manufacture method of furan resin used for steelcasting, in particular to a manufacture technology of low nitrogen furan resin used for steelcasting. The optimum formula is: 8 to 9 shares of formaldehyde (36.5 percent ), 3 to 5 shares of carbamide, no less than 85 shares of furfuryl alcohol, 40 percent of NaOH solution, 10 percent of hydrochloric acid solution, 0.2 percent of silane coupling agent; the invention comprises the following steps: feeding material, increasing temperature by heating, dehydration, synthesizing, discharging material, packing and warehousing; the invention uses the unique technology to achieve good performances that free formaldehyde of low nitrogen furan resin used for steelcasting is less than 0.1 percent, the tensile strength for 24hours is more than 2.2MPa, the using time is more than 30 minutes, and the nitrogen content is less than 1.4 percent.

Description

technical field [0001] The invention relates to a production method of furan resin for steel casting, in particular to a production process of low nitrogen furan resin for steel casting. Background technique [0002] At present, the known resin sand binders for casting are mainly furan resins, which can be divided into high-nitrogen furan resins, medium-nitrogen furan resins, low-nitrogen furan resins and nitrogen-free furan resins according to their nitrogen content. For its special casting requirements, low-nitrogen and nitrogen-free resins are generally used. The current low-nitrogen and nitrogen-free resins for steel casting mainly have the following defects: the free formaldehyde content of the resin is high, which is released in large quantities during use, seriously polluting the working environment and harming the health; Castings produce pores; the higher the urea content in the resin, the higher the strength and the lower the product cost, but the amount of gas ge...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B22C1/22
Inventor 蔡文礼肖青国杨洋
Owner 共享新材料(山东)有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products