Organic ester-hardened alkaline phenolic resin and preparation method thereof

A technology of phenolic resin and organic ester, which is applied in manufacturing tools, casting molding equipment, metal processing equipment, etc., and can solve problems such as poor collapsibility, unfavorable recycling of old sand, and difficulty in sand cleaning

Inactive Publication Date: 2015-03-11
JINAN SHENGQUAN GROUP SHARE HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Another object of the present invention is to improve the high-temperature collapsibility of molding sand with organic ester hardened alkaline phenolic resin for foundry, which solves the problem that existing products are difficult to clean sand due to poor collapsibility, which is not conducive to the recycling and reuse of old sand

Method used

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  • Organic ester-hardened alkaline phenolic resin and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0030] Add 90g of phenol to the reaction flask, start stirring and add 10g of lignin to melt; add 43g of potassium hydroxide solution with a content of 48%, and increase the temperature to 90°C for 30 minutes;

[0031] Add 169g 37% formaldehyde dropwise within 30 minutes to one hour, and react at a constant temperature of 90 to 95°C for 1 to 2 hours;

[0032] Add 143g of 48% potassium hydroxide solution after cooling to 70~80℃, increase the temperature to 90℃ to make the resin viscosity reach 80~200mPa.s (25℃), add 3g water, and reduce the temperature.

Embodiment 2

[0034] Add 70g of phenol to the reaction flask, start stirring and add 30g of lignin to melt; add 43g of potassium hydroxide solution with a content of 48%, and increase the temperature to 90°C for 30 minutes;

[0035] Add 162g of 37% formaldehyde dropwise within 30 minutes to one hour, and react at a constant temperature of 90~95℃ for 1~2 hours;

[0036] Add 85g of 48% potassium hydroxide solution to 70~80℃, increase the temperature to 90℃ to make the resin viscosity reach 80~200mPa.s (25℃), add 6g water, and reduce the temperature.

Embodiment 3

[0038] Add 70g of phenol to the reaction flask, start stirring and add 30g of lignin to melt; add 43g of potassium hydroxide solution with a content of 48%, and increase the temperature to 90°C for 30 minutes;

[0039] Add 162g of 37% formaldehyde dropwise within 30 minutes to one hour, and react at a constant temperature of 90~95℃ for 1~2 hours;

[0040] Add 149g of 35% sodium hydroxide solution when the temperature is lowered to 70~80℃, increase the temperature to 90℃ to make the resin viscosity reach 80~200mPa.s (25℃), add 6g water, and lower the temperature.

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Abstract

The invention provides organic ester-hardened alkaline phenolic resin and a preparation method thereof. The organic ester-hardened alkaline phenolic resin is prepared from the following components in parts by weight: 50 to 90 parts of phenol, 129 to 216 parts of formaldehyde, 10 to 50 parts of lignin and 85 to 149 parts of sodium hydroxide. According to the organic ester-hardened alkaline phenolic resin and the preparation method thereof, production cost is lowered, the using amounts of toxic substances of formaldehyde and phenol, are reduced, and meanwhile, the problems of difficulty in sand removal and unfavorability in the recycling of waste sand, which are caused by poor collapsibility of a conventional product, are solved.

Description

Technical field [0001] The invention relates to an organic ester hardening alkaline phenolic resin and a preparation method thereof. Background technique [0002] my country is the world's largest country in the production of castings. More than 80% of the cast steel uses the sodium silicate sand process, which is basically impossible to recycle. Tens of millions of old alkaline sands are discarded every year, causing serious environmental pollution and inconsistent with the national environmental protection policy. The use of hot core box resin technology has high energy consumption, large release of toxic gas, and harsh working environment for workers; triethylamine cold core boxes and sulfur dioxide cold core boxes use a large amount of organic solvents, and furan resin curing agents contain a large amount of sulfur. It will release benzene sulfur dioxide gas, which will seriously endanger the health of operators and cause damage to the environment. The organic ester hardeni...

Claims

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Application Information

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IPC IPC(8): C08G8/34B22C1/22
Inventor祝建勋李培强冯桂荣尹维维
OwnerJINAN SHENGQUAN GROUP SHARE HLDG