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Phenolic resin for refractory bricks and preparation method thereof

A technology of phenolic resin and refractory bricks, which is applied in the field of phenolic resin, can solve the problems of unsatisfactory encapsulation, poor wettability of blanks, poor wettability of blanks, etc., and achieve the promotion of encapsulation, small volume expansion rate, and favorable Forming effect

Active Publication Date: 2013-01-16
营口圣泉高科材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, when the existing resin binder is used to produce refractory bricks, the encapsulation of the blank by the liquid resin is not ideal, and the solvent used is also volatile, which leads to poor wettability of the blank. In this case, the lower free phenol It will also make the wettability of the billet poor, and the moisture retention when mixing the billet is not good, which is not conducive to forming, prone to cracks, lamination and the product is not resistant to erosion

Method used

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  • Phenolic resin for refractory bricks and preparation method thereof
  • Phenolic resin for refractory bricks and preparation method thereof

Examples

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Embodiment 1

[0019] Add phenol, formaldehyde, and sodium hydroxide into the reaction kettle according to the ratio of substances 1:0.33:0.01, heat and stir to 75°C, keep the temperature within this temperature range for 1.5h, add the remaining formaldehyde, and finish adding within 1h. Then raise the temperature to 100°C and keep the temperature constant for 1h; then add polyethylene glycol 200 with 30% phenol weight, and finally dehydrate at 60°C and 0.01MPa until the resin viscosity is 10000MPa·s / 25°C.

[0020] The phenolic resin produced in this embodiment has a solid content of 85%, a residual carbon rate of 42%, a free phenol content of 4-6%, and a water content of 0.4%.

Embodiment 2

[0022] Add phenol, formaldehyde, and sodium hydroxide into the reaction kettle according to the ratio of substances 1:0.33:0.01, heat and stir to 80°C, keep the temperature within this temperature range for 1h, add the remaining formaldehyde, finish adding within 1h, and then Raise the temperature to 95°C and keep the temperature constant for 1.5h; then add polyethylene glycol 400 with 40% phenol weight, and finally dehydrate at 60°C and 0.01MPa until the resin viscosity is 9000MPa·s / 25°C.

[0023] The solid content of the phenolic resin produced in this embodiment is 64%, the residual carbon rate is 55%, the free phenol is 2-3%, and the moisture content is 0.3%.

Embodiment 3

[0025] Add phenol, formaldehyde, and sodium hydroxide into the reaction kettle according to the ratio of substances 1:0.33:0.01, heat and stir to 78°C, keep the temperature within this temperature range for 1.2h, add the remaining formaldehyde, and finish adding within 1h. Then raise the temperature to 100°C and keep the temperature constant for 1.5h; then add polyethylene glycol 600 with 60% phenol weight, and finally dehydrate at 60°C and 0.01MPa until the resin viscosity is 7000MPa·s / 25°C.

[0026] The phenolic resin produced in this example has a solid content of 75%, a residual carbon rate of 30%, free phenol of 4-5%, and a moisture content of 0.2%.

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Abstract

The invention discloses a preparation method of phenolic resin for refractory bricks, and the preparation method comprises the following steps of: (1) separately weighing a phenol, an aldehyde and an acidic catalyst in a molar ratio of 1:(0.5-0.8):(0.002-0.015); (2) adding the phenol, the acidic catalyst and partial aldehyde to a reaction kettle, uniformly stirring, heating to 75-80 DEG C, and insulating heat for 1-1.5 hours; (3) adding the remaining aldehyde to the reaction kettle, heating to 95-100 DEG C, and insulating heat for 1-1.5 hours; (4) carrying out vacuum dehydration on the reaction material obtained in the step (3) until the water content is less than 0.3%; and (5) adding an additive, the amount of which accounts for 30-60wt% of the phenol, to the dewatered material obtained in the step (4), and uniformly mixing, wherein the additive is selected from one or two of polyethylene glycol 200, polyethylene glycol 400, polyethylene glycol 600, polypropylene glycol 200, polypropylene glycol 400 and polypropylene glycol 600. The phenolic resin prepared by the preparation method disclosed by the invention has very good wetting property and moisture retention property.

Description

technical field [0001] The invention relates to the technical field of phenolic resins, in particular to a preparation method of the phenolic resin for refractory bricks and a phenolic resin obtained by the preparation method. Background technique [0002] In the production process of refractory brick products such as magnesia-carbon bricks, magnesia-calcium-carbon bricks, and magnesia-alumina-carbon bricks, resin binders play a very important role. big impact. This requires that the binder has good wettability and moisture retention to the refractory oxide, and at the same time can form a good carbon bond with graphite at high temperature. Because it has good wettability and moisture retention, suitable viscosity and a binder that does not produce water during sintering, it can improve the mixing quality of the blank and the bulk density of the brick. In addition, the good wettability also enables the binder to be evenly distributed on the surface of the particles and gra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L61/10C08L71/00C08G8/10C04B35/66
Inventor 唐一林江成真魏务翠梁静翠
Owner 营口圣泉高科材料有限公司