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A kind of low-viscosity expandable phenolic resin and preparation method thereof

A phenolic resin and expandability technology, which is applied in the field of low-viscosity expandable phenolic resin and its preparation, can solve the problems of high viscosity of the expandable phenolic resin, etc., and achieves simple and easy-to-control preparation methods, lowering resin viscosity, and manufacturing low cost effect

Active Publication Date: 2015-10-21
WINCELL INSULATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem of high viscosity of the expandable phenolic resin synthesized from paraformaldehyde in the prior art, the present invention provides a low-viscosity expandable phenolic resin that can effectively improve the reaction rate, yield and product quality, and ensure production safety and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A low-viscosity expandable phenolic resin, comprising weighing raw materials by mass fraction: 100 parts of phenol, 48 parts of paraformaldehyde, 0.5 part of sodium hydroxide, 0.5 part of barium hydroxide, 10 parts of diluent, 1 part of urea, 5 parts of inorganic filler; the diluent is a mixture of water and alcohol, the mass ratio of water and alcohol is 3:1, the alcohol is one or more of ethylene glycol, diethylene glycol, and polyvinyl alcohol, and the inorganic filler includes One or more of aluminum hydroxide powder, talcum powder, and kaolin.

[0019] Its preparation method comprises the following steps:

[0020] (1) Vacuum pump 100 parts of molten phenol into the reaction kettle, add 48 parts of paraformaldehyde, 0.5 parts of sodium hydroxide, and 5 parts of diluent into the reaction kettle at one time, keep the reaction kettle in a state of equilibrium with the atmosphere, start stirring and Turn on the cooling water to cool the reaction kettle, and keep the t...

Embodiment 2

[0024] A low-viscosity expandable phenolic resin, comprising weighing raw materials by mass fraction: 100 parts of phenol, 55 parts of paraformaldehyde, 0.8 parts of sodium hydroxide, 2.8 parts of barium hydroxide, 16 parts of diluent, 3 parts of urea, 7 parts of inorganic filler; the diluent is a mixture of water and alcohol, the mass ratio of water and alcohol is 3:1, the alcohol is one or more of ethylene glycol, diethylene glycol, and polyvinyl alcohol, and the inorganic filler includes One or more of aluminum hydroxide powder, talcum powder, and kaolin.

[0025] Its preparation method comprises the following steps:

[0026] (1) Vacuum pump 100 parts of molten phenol into the reactor, add 55 parts of paraformaldehyde, 0.8 parts of sodium hydroxide, and 8 parts of diluent into the reactor at one time, keep the reactor in a state of equilibrium with the atmosphere, start stirring and Turn on the cooling water to cool the reaction kettle, and keep the temperature at 65°C for...

Embodiment 3

[0030] A low-viscosity expandable phenolic resin, comprising weighing raw materials by mass fraction: 100 parts of phenol, 58 parts of paraformaldehyde, 1 part of sodium hydroxide, 4 parts of barium hydroxide, 20 parts of diluent, 4 parts of urea, 10 parts of inorganic filler; the diluent is a mixture of water and alcohol, the mass ratio of water and alcohol is 3:1, the alcohol is one or more of ethylene glycol, diethylene glycol, polyvinyl alcohol, and the inorganic filler includes One or more of aluminum hydroxide powder, talcum powder, and kaolin.

[0031] Its preparation method comprises the following steps:

[0032] (1) Vacuum pump 100 parts of molten phenol into the reaction kettle, add 58 parts of paraformaldehyde, 1 part of sodium hydroxide, and 10 parts of diluent into the reaction kettle at one time, keep the reaction kettle in a state of equilibrium with the atmosphere, start stirring and Open the cooling water to cool the reaction kettle, and keep the temperatur...

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PUM

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Abstract

The invention relates to low-viscosity expandable phenolic resin and a preparation method thereof. The low-viscosity expandable phenolic resin is prepared from the following raw materials in part(s) by mass: 100 parts of phenol, 48 to 58 parts of paraformaldehyde, 0.5 to 1 part of sodium hydroxide, 0.5 to 4 part(s) of barium hydroxide, 10 to 20 parts of a diluent, 1 to 4 part(s) of urea, and 5 to 10 parts of an inorganic filler. The preparation method adopts sodium hydroxide and barium hydroxide compounded catalyst to catalyze depolymerization and polycondensation reactions in steps, reduces the temperature and resin viscosity through the diluent, and solves the problem that the viscosity of paraformaldehyde is too high during the production and application of expandable phenolic resin; the phenolic resin is in viscosity, high in fire resistance and low in manufacture cost; the preparation method is simple and easy to control; the reactions are stable; the rate and yield are high; the quality is good; hidden dangers of kettle explosion and blocked casting machine are avoided; the phenolic resin is safe to produce and use.

Description

technical field [0001] The invention relates to a phenolic resin, in particular to a low-viscosity expandable phenolic resin and a preparation method thereof. Background technique [0002] Phenolic resin is produced by polycondensation reaction of phenol and aldehyde under the action of acidic or basic catalyst. Under the action of an acidic catalyst, a linear thermoplastic resin will be produced when the phenol is in excess; under the action of a basic catalyst, a body-shaped thermosetting resin will be produced when an aldehyde is in excess. The body-shaped thermosetting resin has good acid resistance, mechanical properties and heat resistance, and is widely used in anti-corrosion engineering, adhesives, flame-retardant materials, grinding wheel manufacturing and other industries. In the reaction process of existing phenol and paraformaldehyde in the reaction process of obtaining a thermosetting resin by polycondensation with an alkaline catalyst, the viscosity of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G8/10C08L61/10C08K3/22C08K3/34
Inventor 秦伯军秦天德石启志张君吉娇
Owner WINCELL INSULATION CO LTD
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