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Method for preparing furan resin for cast iron with waste water and solid formaldehyde

A technology of solid formaldehyde and furan resin, which is applied in the processing field of cast iron resin, can solve environmental pollution and other problems, achieve the effects of reducing production costs, good collapsibility, and reducing the workload of sand cleaning

Active Publication Date: 2017-12-26
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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  • Method for preparing furan resin for cast iron with waste water and solid formaldehyde

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] It is made from 740kg of furfuryl alcohol, 30kg of solid formaldehyde, 130kg of urea, 2kg of γ-methacryloxypropyl trimethoxysilane and 100kg of waste water through the following steps:

[0032] (1) Add waste water and furfuryl alcohol into the reaction kettle, start the mixer to stir, and adjust the pH value to 8.5-9.5 with sodium hydroxide;

[0033] (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 100-110°C, and keep it warm for 140 minutes;

[0034] (3) Cool down to 50°C, add furfuryl alcohol and γ-methacryloxypropyltrimethoxysilane, stir evenly, and discharge to obtain the finished product;

[0035] The above-mentioned solid formaldehyde is paraformaldehyde with a low degree of polymerization, and the content is 90.0%.

[0036] The mass percentage of furfuryl alcohol added in the above step (1) is 70% of the formula composition, and the amount of furfuryl alcohol ad...

Embodiment 2

[0038] It is made from 760kg of furfuryl alcohol, 20kg of solid formaldehyde, 120kg of urea, 2kg of silane coupling agent and 100kg of waste water through the following steps:

[0039](1) Add waste water and furfuryl alcohol into the reaction kettle, start the mixer to stir, and adjust the pH value to 8.5-9.5 with sodium hydroxide;

[0040] (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 100-110°C, and keep it warm for 150 minutes;

[0041] (3) Cool down to 50°C, add furfuryl alcohol and coupling agent, stir evenly, then discharge to obtain finished product;

[0042] The above-mentioned solid formaldehyde is paraformaldehyde with a low degree of polymerization, and its content is 96.0%.

[0043] The mass percentage of 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 fur...

Embodiment 3

[0045] It is made from 780kg of furfuryl alcohol, 30kg of solid formaldehyde, 110kg of urea, 3kg of silane coupling agent and 80kg of waste water through the following steps:

[0046] (1) Add wastewater and furfuryl alcohol into the reaction kettle, start the mixer to stir, and adjust the pH value to 8.5-9.5 with potassium hydroxide;

[0047] (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 100-110°C, and keep it warm for 155 minutes;

[0048] (3) Cool down to 50°C, add furfuryl alcohol and coupling agent, stir evenly, then discharge to obtain finished product;

[0049] The above-mentioned solid formaldehyde is paraformaldehyde with a low degree of polymerization, and its content is 93.0%.

[0050] The mass percentage of 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 remaining par...

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Abstract

The invention relates to a method for preparing furan resin for cast iron by using waste water and solid formaldehyde. The raw materials and mass percentages are: 60-80% of furfuryl alcohol, 2-5% of solid formaldehyde, 9-15% of urea, and 0.2% of coupling agent ‑1.0% and waste water 5‑10%; the preparation process adopts the recycled phenolic resin to produce waste water, and replaces liquid formaldehyde with solid formaldehyde, which reduces the dehydration link in the preparation process and achieves the goals of environmental protection, energy saving and benefit increase. The prepared cast iron furan resin has the characteristics of low free formaldehyde content, high strength and low viscosity.

Description

technical field [0001] The invention belongs to the processing field of cast iron resin, in particular to a method for preparing furan resin for cast iron by using waste water and solid formaldehyde. 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 mold sand collapsibility, low labor intensity, etc., and 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 an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G16/02
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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