Furan resin for cast steel and synthesis method thereof

A technology of furan resin and synthesis method, which is applied to casting molding equipment, casting molds, cores, etc., can solve problems such as environmental pollution, achieve the effects of reducing production costs, smoothing the surface, and improving work efficiency

Inactive Publication Date: 2014-12-10
YULIN LANKE CASTING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the process of resin synthesis, a large amount of process wastewater needs to be removed. The wastewater contains a large amount of free formaldehyde, methanol, methylfuran and other small molecular organic substances, and the COD value is as high as tens of thousands. Discharging into the water body will cause very serious environmental pollution.

Method used

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  • Furan resin for cast steel and synthesis method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] It is made from 780kg of furfuryl alcohol, 91kg of solid formaldehyde, 100kg of phenol, 6.5kg of urea, 2kg of silane coupling agent and 20.5kg of water, through the following steps:

[0031] (1) Add phenol and water into the reaction kettle, start the mixer to stir, and adjust the pH value to 8.5-9.5 with sodium hydroxide;

[0032] (2) Add urea and solid formaldehyde, add steam to raise the temperature, keep raising the temperature by 8°C every 5 minutes, then raise the temperature to 90°C, and keep it warm for 50 minutes;

[0033] (3) Cool down to below 80°C, add furfuryl alcohol, and adjust the pH value to 9.5-10.5 with sodium hydroxide;

[0034] (4) Add steam to raise the temperature to 105-115°C, keep warm and reflux for 80-100 minutes;

[0035] (5) Cool down to 50°C, add furfuryl alcohol and silane coupling agent, stir evenly to obtain the finished product.

[0036] The solid formaldehyde is paraformaldehyde with a low degree of polymerization, and the content is...

Embodiment 2

[0039] It is prepared from 712kg of furfuryl alcohol, 107kg of solid formaldehyde, 120kg of phenol, 11kg of urea, silane coupling agent X-602, 5kg of γ-aminopropyltriethoxysilane, and 45kg of water through the following steps:

[0040] (1) Add phenol and water into the reaction kettle, start the mixer to stir, and adjust the pH value to 8.5-9.5 with potassium hydroxide;

[0041](2) Add urea and solid formaldehyde, add steam to raise the temperature, keep raising the temperature by 8°C every 5 minutes, then raise the temperature to 90°C, and keep it warm for 55 minutes;

[0042] (3) Cool down to below 80°C, add furfuryl alcohol, and adjust the pH value to 9.5-10.5 with potassium hydroxide;

[0043] (4) Add steam to raise the temperature to 105-115°C, keep warm and reflux for 80-100 minutes;

[0044] (5) Cool down to 50°C, add the mixture of furfuryl alcohol, silane coupling agent X-602 and γ-aminopropyltriethoxysilane, stir well to get the finished product.

[0045] The solid...

Embodiment 3

[0048] It is made from 704kg of furfuryl alcohol, 115kg of solid formaldehyde, 130kg of phenol, 17.5kg of urea, 4kg of γ-methacryloxypropyltrimethoxysilane and 30kg of water through the following steps:

[0049] (1) Add phenol and water into the reaction kettle, start the mixer to stir, and adjust the pH value to 8.5-9.5 with melamine and sodium hydroxide;

[0050] (2) Add urea and solid formaldehyde, add steam to raise the temperature, keep raising the temperature by 8°C every 5 minutes, then raise the temperature to 90°C, and keep it warm for 60 minutes;

[0051] (3) Cool down to below 80°C, add furfuryl alcohol, and adjust the pH value to 9.5-10.5 with melamine and sodium hydroxide;

[0052] (4) Add steam to raise the temperature to 105-115°C, keep warm and reflux for 80-100 minutes;

[0053] (5) Cool down to 50°C, add furfuryl alcohol and γ-methacryloxypropyltrimethoxysilane, stir evenly to obtain the finished product.

[0054] The solid formaldehyde is paraformaldehyde ...

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Abstract

The invention relates to a furan resin for cast steel and a synthesis method thereof. The furan resin is characterized by comprising the following raw materials in percentage by mass: 70-80% of furfuryl alcohol, 9-15% of solid formaldehyde, 10-15% of phenol, 0.5-5.0% of urea, 0.2-0.5% of coupling agent and 2-5% of water. The solid formaldehyde is used instead of liquid formaldehyde in the synthesis process of the furan resin for cast steel, thereby reducing the sewage generated in the production process of the furan resin for cast steel; and the furan resin for cast steel has the characteristics of high strength, low viscosity, favorable molding-sand property and the like.

Description

technical field [0001] The invention belongs to a furan resin and a synthesis method thereof, in particular to a furan resin for steel casting and a synthesis method thereof. Background technique [0002] In sand casting, no-hardening furan resin sand molding core has the characteristics of high strength, high dimensional accuracy, fast hardening speed, high production efficiency, good sand collapsibility, low labor intensity, etc. It is widely used in production at present. Furan resin is by far the most widely used polycondensation resin in foundry production, and the annual consumption has reached more than 500,000 tons. Furan resin refers to the general term for resins produced from furfuryl alcohol with a furan ring as a raw material. It solidifies into an insoluble and infusible solid in an acidic medium. The main raw materials for producing furan resin are furfuryl alcohol, formaldehyde and urea. First, the addition reaction of urea and formaldehyde under alkaline co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G16/02B22C1/22
Inventor 戴宗宪罗永杰
Owner YULIN LANKE CASTING MATERIAL
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