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Preparation method of phenol aldehyde resin emulsion

A technology of phenolic resin emulsion and phenol, applied in the field of preparation of phenolic resin emulsion, can solve problems such as being difficult to realize, and achieve the effect of good stability

Inactive Publication Date: 2014-02-12
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, from the perspective of industrial production, it is difficult to achieve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A kind of preparation method of phenolic resin emulsion, specifically comprises the steps:

[0024] (1) Weigh 94g of phenol, 55g of paraformaldehyde, 10g of aqueous sodium hydroxide solution with a concentration of 10% by mass, and 5g of emulsifier sodium p-toluenesulfonate, and add them all into a three-necked flask, stir and heat up, at 60°C Heat preservation reaction for 60 minutes, heat up to 98°C, heat preservation reaction for 30 minutes to obtain a reaction solution, the final pH of the reaction solution is 11;

[0025] Wherein the consumption of phenol and formaldehyde is calculated by molar ratio, that is, phenol: formaldehyde is 1:1.83;

[0026] The emulsifying agent used is sodium p-toluenesulfonate, and its consumption is 5.3% of phenol weight;

[0027] (2) Cool the reaction solution obtained in step (1) to room temperature, add 0.5 g of a stabilizer, stir for 30 minutes, adjust the pH value to 7-9 with an aqueous phosphoric acid solution with a concentrati...

Embodiment 2

[0031] A kind of preparation method of phenolic resin emulsion, specifically comprises the steps:

[0032] (1) Weigh 94g of phenol, 45g of paraformaldehyde, 10g of aqueous sodium hydroxide solution with a concentration of 10% by mass, and 1g of emulsifier sodium dodecylsulfonate, and add them all into a three-necked flask, stir and heat up, and 78°C heat preservation reaction for 30 minutes, then raised the temperature to 90°C, heat preservation reaction for 60 minutes to obtain the reaction solution, the pH value of the final reaction solution was 14.5;

[0033] The amount of phenol and formaldehyde is calculated by molar ratio, that is, phenol: formaldehyde is 1:1.50;

[0034] The emulsifying agent used is sodium p-dodecylsulfonate, and its consumption is 1.06% of phenol weight;

[0035] (2) Cool the reaction solution obtained in step (1) to room temperature. Add 1.5 g of polyacrylamide as a stabilizer, stir for 45 minutes, and adjust the pH value to 7-9 with a phosphoric ...

Embodiment 3

[0039] A kind of preparation method of phenolic resin emulsion, specifically comprises the steps:

[0040] (1) Weigh 94g of phenol, 50g of paraformaldehyde, 10g of aqueous sodium hydroxide solution with a concentration of 10% by mass, and 9g of emulsifier nonylphenol polyoxyethylene ether, and add them all into a three-necked flask. Stir and heat to raise the temperature, keep the temperature at 70°C for 60 minutes, raise the temperature to 96°C, keep the temperature for 60 minutes, and obtain the reaction solution. The pH value of the final reaction solution is 13;

[0041] Wherein the consumption of phenol and formaldehyde is calculated by molar ratio, that is, phenol: formaldehyde is 1:1.66;

[0042] The emulsifier used is nonylphenol polyoxyethylene ether, and its consumption is 9.57% of phenol weight;

[0043] (2) Cool the reaction solution obtained in step (1) to room temperature. Add 5 g of casein as a stabilizer, stir for 60 minutes, and adjust the pH value to 7-9 wi...

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Abstract

The invention discloses a preparation method of a phenol aldehyde resin emulsion, which comprises the following steps: by using phenol and formaldehyde as raw materials and a 10 wt% sodium hydroxide water solution as a catalyst, heating while adding an emulsifier and stirring, reacting at the constant temperature of 60-70 DEG C for 30-60 minutes, heating to 90-98 DEG C, keeping the temperature to react for 30-60 minutes, stopping the reaction, cooling the obtained reaction solution to room temperature, adding a stabilizer, stirring for 30-60 minutes, and regulating the pH value to 7-9 with an 85 wt% phosphoric acid water solution, thereby obtaining the milky phenol aldehyde resin emulsion. The solid content of the phenol aldehyde resin emulsion is 48+ / -2%, the viscosity is 1000-2500cp, and the storage stability is high. When in use, the phenol aldehyde resin emulsion has favorable properties of the traditional phenol aldehyde resin, has light color after curing, and can embody the color of natural wood.

Description

technical field [0001] The invention relates to a preparation method of phenolic resin emulsion. Background technique [0002] Phenolic resin is widely used in many industries such as wood processing and automobile manufacturing because of its excellent water resistance, fire resistance, durability and adhesive force. However, the color of the product after curing is dark red and its formaldehyde content is high, which has seriously affected the further development of phenolic resin and people's trust in it. [0003] Phenolic resins are widely used in the manufacture of wood-based panels. Products pressed with phenolic resin have excellent water resistance, but the resin tends to be dark red or brown after curing. The deep red color of phenolic resin becomes a serious disadvantage when the appearance of the product is emphasized or when the natural color of wood is required on the surface of the product. [0004] The method of preparing and storing the resin in an inert e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/10C08J3/03
Inventor 黄剑清潘安健
Owner SHANGHAI INST OF TECH