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A kind of fragrance-type modified phenolic resin for sand casting and preparation method thereof

A phenolic resin, sand casting technology, applied in casting molding equipment, cores, molds, etc., can solve the problems of irritating odor, limited industrial application, worker health hazards, etc., to reduce waste water discharge, excellent thermal state Flexural strength, less odor during production

Active Publication Date: 2019-07-30
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
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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 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.
In addition, when solid formaldehyde is used instead of liquid formaldehyde to synthesize phenolic resin, the reaction is not easy to control, so the technology is difficult and the industrial application is limited.
And the irritating smell will be produced during the synthesis process, which will cause harm to the health of workers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The steps of this embodiment are:

[0030] (1) Add 40g of solid formaldehyde, 26g of phenol, 20g of acetone, and 15.4g of urea into the reaction kettle, start the mixer to stir, and use the alkaline catalyst sodium hydroxide to adjust the pH of the raw materials to 8;

[0031] (2) Add steam to raise the temperature, keep raising the temperature by 20°C every 10 minutes, raise the temperature to 80°C, and keep it warm for 150 minutes;

[0032] (3) Add acidic catalyst phosphoric acid to adjust the pH of the semi-finished product to 5, add 50g of modifier cyclohexanone, continue to heat up, and heat up to 105°C for 60min;

[0033] (4) Cool down to 50°C, add 1g of coupling agent KH-550, stir evenly to obtain the finished product.

Embodiment 2

[0035] The steps of this embodiment are:

[0036] (1) Add 40g of solid formaldehyde, 26g of phenol, 20g of acetone, and 15.4g of urea into the reaction kettle, start the mixer to stir, and use the alkaline catalyst sodium hydroxide to adjust the pH of the raw materials to 7.5;

[0037] (2) Add steam to raise the temperature, keep raising the temperature by 20°C every 10 minutes, raise the temperature to 90°C, and keep it warm for 150 minutes;

[0038] (3) Add acidic catalyst phosphoric acid to adjust the pH of the semi-finished product to 3, add 50g of modifier cyclohexanone, continue to heat up, and heat up to 105°C for 80min;

[0039] (4) Cool down to 50°C, add 1g of coupling agent KH-550, stir evenly to obtain the finished product.

Embodiment 3

[0041] The steps of this embodiment are:

[0042] (1) Add 40g of solid formaldehyde, 26g of phenol, 20g of acetone, and 15.4g of urea into the reaction kettle, start the mixer to stir, and use the alkaline catalyst sodium hydroxide to adjust the pH of the raw materials to 10.5;

[0043] (2) Add steam to raise the temperature, keep raising the temperature by 20°C every 10 minutes, raise the temperature to 100°C, and keep it warm for 150 minutes;

[0044] (3) Add acidic catalyst phosphoric acid to adjust the pH of the semi-finished product to 6, add 50g of modifier cyclohexanone, continue to heat up, and heat up to 105°C for 150min;

[0045] (4) Cool down to 50°C, add 1g of coupling agent KH-550, stir evenly to obtain the finished product.

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PUM

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Abstract

The invention provides faint scent type modified phenolic resin for sand mold casting and a preparation method thereof. The modified phenolic resin is prepared by carrying out reaction on solid formaldehyde, phenol, acetone, urea, a modifying agent and a coupling agent and mixing. The modified phenolic resin has a harmless minty faint scent smell; in a preparation process, paraformaldehyde can be completely depolymerized, and the phenomena of formaldehyde volatilization, serious deflation and oozing of water, even production of gel carbonization and the like can be avoided in a depolymerization and heat release process. By adopting the modified phenolic resin disclosed by the invention as a binding agent, a coated sand product is prepared. The coated sand product is high in strength, low in gas release volume and low in viscosity; moreover, the manufacturing requirement on casting parts with high precision and high strength can be preferably met.

Description

technical field [0001] The invention belongs to the field of organic polymer materials and preparation thereof, in particular to a fragrance-type modified phenolic resin used for sand casting and a preparation method thereof. Background technique [0002] Sand casting is a casting method in which castings are cast in sand molds. The main raw materials for making sand molds are foundry sand and binders. The main principle of production is to bond loose foundry sand grains with binders to form sand molds. The sand mold made of furan resin as a binder has high strength, high dimensional accuracy, fast hardening speed, high production efficiency, good mold sand collapsibility, and low labor intensity. Therefore, it is widely used in sand mold casting. In recent years, the annual usage All are above 500,000 tons. However, due to the high price of furfuryl alcohol as a raw material, the synthesis cost of furan resin is too high, which hinders its vigorous promotion in the foundr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G14/12C08G14/08B22C1/22
CPCB22C1/2253C08G14/08C08G14/12
Inventor 张娟孙爽李未康张健勇
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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