Method for producing foamable phenol formaldehyde resin by using paraformaldehyde

A technology of paraformaldehyde and phenolic resin, which is applied in the field of producing expandable phenolic resin from paraformaldehyde, which can solve the problems of a large amount of waste liquid, high viscosity, unfavorable production of phenolic foam, etc.

Active Publication Date: 2012-10-17
四川景文材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conventional synthesis method is generally obtained by the base-catalyzed reaction of phenol and liquid formaldehyde (37% formaldehyde aqueous solution). This method requires vacuum dehydration in the later stage, resulting in a large amount of waste liquid, and the production efficiency is low, auxiliary heating is required, and the product quality is not good. Easy and stable control
Although the use of paraformaldehyde to produce phenolic resin reduces the discharge of waste liquid and improves production efficiency, the viscosity of the final product is generally relatively high, between 20-50Pa·s, which is not conducive to the production of phenolic foam in the later stage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1. A method for producing expandable phenolic resin with paraformaldehyde, comprising the steps of:

[0043] (1) Prepare raw materials:

[0044] Raw materials are calculated in parts by mass, including:

[0045] 100 parts of phenol, 49.8 parts of paraformaldehyde, 0.5 parts of alkali catalyst, 1 part of urea, and 4 parts of diluent.

[0046] The base catalyst is sodium hydroxide.

[0047] The purity of the paraformaldehyde is 91%.

[0048] The diluent is a mixture of water and ethylene glycol, and the mixing ratio is water: the mass ratio of alcohols is 1:1.

[0049] Both urea and paraformaldehyde are solid particles.

[0050] (2) React the above-mentioned phenol, paraformaldehyde, alkali catalyst, and urea in the reaction kettle under normal pressure at 55° C. to 90° C.; the normal pressure is a standard atmospheric pressure.

[0051] (3) After the reaction, add the above-mentioned diluent into the reaction kettle, lower the temperature to complete the reaction, and...

Embodiment 2

[0053] 1. A method for producing expandable phenolic resin with paraformaldehyde, comprising the steps of:

[0054] (1) Prepare raw materials:

[0055] Raw materials are calculated in parts by mass, including:

[0056] 120 parts of phenol, 75.7 parts of paraformaldehyde, 5 parts of alkali catalyst, 5 parts of urea, and 10 parts of diluent.

[0057] The alkali catalyst is 2.5 parts each of magnesium hydroxide and barium hydroxide.

[0058] The purity of the paraformaldehyde is 96%.

[0059] The diluent is a mixture of water and diethylene glycol, and the mixing ratio is water: the mass ratio of alcohols is 1:1.

[0060] (2) React the above-mentioned phenol, paraformaldehyde, alkali catalyst, and urea in the reaction kettle under normal pressure at 55° C. to 90° C.; the normal pressure is a standard atmospheric pressure.

[0061] (3) After the reaction, add the above-mentioned diluent into the reaction kettle, lower the temperature to complete the reaction, and obtain an exp...

Embodiment 3

[0063] 1. A method for producing expandable phenolic resin with paraformaldehyde, comprising the steps of:

[0064] (1) Prepare raw materials:

[0065] Raw materials are calculated in parts by mass, including:

[0066] 100 parts of phenol, 49.8 parts of paraformaldehyde, 0.5 parts of alkali catalyst, 1 part of urea, and 4 parts of diluent.

[0067] The base catalyst is sodium hydroxide.

[0068] The purity of the paraformaldehyde is 91%.

[0069] The diluent is a mixture of water and ethylene glycol, and the mixing ratio is water: the mass ratio of alcohols is 1:1.

[0070] (2) React the above mass parts of phenol, paraformaldehyde, alkali catalyst, and urea in a reactor at 55°C-90°C under normal pressure; the specific steps are as follows:

[0071] (21) Put the above-mentioned measured phenol and catalyst into the reaction vessel, and keep the temperature at 60°C for 30min;

[0072] (22) Put paraformaldehyde into the reaction vessel in four batches, the first batch puts ...

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Abstract

The present invention discloses a method for producing a foamable phenol formaldehyde resin by using paraformaldehyde. The method comprises the following steps: (1) preparing raw materials, wherein the raw materials comprise, by mass, 100-120 parts of phenol, 49.8-75.7 parts of paraformaldehyde, 0.5-5 parts of an alkali catalyst, 1-5 parts of urea, and 4-10 parts of a diluent; (2) adding the phenol, the paraformaldehyde, the alkali catalyst and the urea to a reaction kettle according to the mass parts, and carrying out a reaction at a temperature of 55-90 DEG C under atmospheric pressure; and (3) adding the diluent to the reaction kettle after the reaction, cooling and terminating the reaction. With the method of the present invention, the problem of heat emission of formaldehyde is sloved, the uniformity of the whole product can be ensured, the foamable phenol formaldehyde resin can be obtained, and the late stage phenol formaldehyde foam production can be prompted, wherein the viscosity of the obtained foamable phenol formaldehyde resin is not more than 15 Pa.s.

Description

technical field [0001] The invention relates to a method for producing expandable phenolic resin with paraformaldehyde. Background technique [0002] At present, the requirements for fireproof performance of wall insulation materials are getting higher and higher, and it is difficult for ordinary polystyrene boards or polyurethane foam boards to meet the corresponding fireproof requirements. The phenolic foam insulation material has been recognized by people for its excellent fire resistance, heat insulation and stability. The main raw material for producing phenolic foam insulation materials is expandable phenolic resin. The principle of the expandable phenolic resin is a liquid resin obtained by the reaction of phenol and formaldehyde under the catalysis of an alkaline substance, also known as a first-stage thermosetting phenolic resin. The conventional synthesis method is generally obtained by base-catalyzed reaction of phenol and liquid formaldehyde (37% formaldehyde a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/10
Inventor 李露王森
Owner 四川景文材料科技有限公司
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