Furan resin for cast iron 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

Active Publication Date: 2015-01-07
广西兰科资源再生利用有限公司
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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 iron and synthesis method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1600kg of furfuryl alcohol, 137kg of solid formaldehyde, 130kg of urea, 9kg of coupling agent and 124kg of water are prepared through the following steps:

[0029] (1) Add water and furfuryl alcohol into the reaction kettle, start the mixer to stir, and adjust the pH value to 8.9-9.1 with sodium hydroxide;

[0030] (2) Add urea and solid formaldehyde, add steam to raise the temperature, keep raising the temperature by 8°C every 5 minutes, raise the temperature to 105-115°C, and keep it warm for 120 minutes;

[0031] (3) Cool down to 50°C, add furfuryl alcohol and coupling agent, stir evenly to obtain the finished product.

[0032] The above-mentioned solid formaldehyde is paraformaldehyde with a low degree of polymerization, and the content is 90.0%.

[0033] The weight percentage of furfuryl alcohol added in the above step (1) is 70% of the formula composition, and the amount of furfuryl alcohol added in the step (3) is the remaining part of furfuryl alcohol in the fo...

Embodiment 2

[0035] 3850kg of furfuryl alcohol, 396kg of solid formaldehyde, 377kg of urea, 27kg of coupling agent and 350kg of water are prepared through the following steps:

[0036] (1) Add water and furfuryl alcohol into the reaction kettle, start the mixer to stir, and adjust the pH value to 8.9-9.1 with potassium hydroxide;

[0037] (2) Add urea and solid formaldehyde, add steam to raise the temperature, keep raising the temperature by 8°C every 5 minutes, raise the temperature to 105-115°C, and keep it warm for 140 minutes;

[0038] (3) Cool down to 50°C, add furfuryl alcohol and coupling agent, stir evenly to obtain the finished product.

[0039] The above-mentioned solid formaldehyde is paraformaldehyde with a low degree of polymerization, and its content is 96.0%.

[0040] The weight percentage of the furfuryl alcohol added in the above step (1) is 75% of the formula composition, and the amount of furfuryl alcohol added in the step (3) is the rest of the furfuryl alcohol in the ...

Embodiment 3

[0042]1480kg of furfuryl alcohol, 180kg of solid formaldehyde, 170kg of urea, 10kg of coupling agent and 160kg of water are prepared through the following steps:

[0043] (1) Add water and furfuryl alcohol into the reaction kettle, start the mixer to stir, and adjust the pH value to 8.9-9.1 with sodium hydroxide;

[0044] (2) Add urea and solid formaldehyde, add steam to raise the temperature, keep raising the temperature by 8°C every 5 minutes, raise the temperature to 105-115°C, and keep it warm for 160 minutes;

[0045] (3) Cool down to 50°C, add furfuryl alcohol and coupling agent, stir evenly to obtain the finished product.

[0046] The above-mentioned solid formaldehyde is paraformaldehyde with a low degree of polymerization, and its content is 93.0%.

[0047] The weight percentage of the furfuryl alcohol added in the above step (1) is 78% of the formula composition, and the amount of furfuryl alcohol added in the step (3) is the rest of the furfuryl alcohol in the form...

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Abstract

The invention relates to a furan resin for cast iron and a synthesis method thereof. The invention is characterized in that the furan resin is prepared from the following raw materials in parts by weight: 60-80% of furfuryl alcohol, 5-15% of solid formaldehyde, 5-15% of urea, 0.2-1.0% of coupling agent and 5-10% of water. The solid formaldehyde is used instead of liquid formaldehyde in the synthesis process, thereby solving the problem of the sewage generated in the production process of the furan resin for cast iron; and the furan resin for cast iron has the characteristics of high strength, low viscosity, favorable molding-sand property and the like.

Description

technical field [0001] The invention belongs to the processing field of cast iron resin, in particular to a furan resin for cast iron 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 conditions ...

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 广西兰科资源再生利用有限公司
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