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A method for removing free formaldehyde in phenolic resin

A technology of phenolic resin and free formaldehyde, applied in the field of adhesives, can solve the problems of high cost, cleavage of phenolic resin double bonds, complicated extraction method operation, etc., and achieves the effects of fast removal speed, high removal accuracy and simple steps.

Active Publication Date: 2021-07-23
SHANGHAI LVQIANG NEW MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the extraction method is complicated and costly; the condensation method has poor impurity removal effect; and the oxidation method is not suitable for phenolic resin aqueous solution products due to its strong oxidative property, which will directly cause the double bond of phenolic resin to be broken, and the product will be modified, seriously affecting product stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A phenolic resin solution with a free aldehyde content of 1% was selected as the stock solution. Take 200g of the stock solution in a container with an aspect ratio of 4, inject ozone gas from the bottom of the container, stir and react at room temperature 25°C for 5 minutes to obtain Example 1. Wherein the ozone gas concentration of feeding is 18mg / L, and the gas flow rate is 6L / min, and the feeding mode is continuous feeding, totally feeds 0.54g of ozone, and the formaldehyde removal rate is 69%.

Embodiment 2

[0030] A phenolic resin solution with a free aldehyde content of 1% was selected as the stock solution. Take 200g of the stock solution in a container with an aspect ratio of 4, inject ozone gas from the bottom of the container, stir and react at room temperature 25°C for 10 minutes to obtain Example 2. The concentration of ozone gas introduced is 12mg / L, the gas flow rate is 6L / min, the mode of introduction is intermittent, and the ozone gas is intermittently introduced for 5s every 3s, a total of 0.45g of ozone is introduced, and the formaldehyde removal rate is 73%.

Embodiment 3

[0032] A phenolic resin solution with a free aldehyde content of 1% was selected as the stock solution. Take 200g of the stock solution in a container with an aspect ratio of 4, inject ozone gas from the bottom of the container, stir and react at room temperature 25°C for 8 minutes to obtain Example 3. Among them, the concentration of ozone gas introduced is 18 mg / L, the gas flow rate is 6 L / min, and the mode of introduction is intermittent, and the ozone gas is intermittently introduced for 3 seconds every 5 seconds, and a total of 0.54 g of ozone is introduced, and the formaldehyde removal rate is 74%.

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Abstract

The invention relates to a method for removing free formaldehyde in phenolic resin. The method is to directly pass ozone gas into a certain amount of phenolic resin aqueous solution to oxidize and remove free formaldehyde in the solution. Compared with the prior art, the invention has simple steps, can quickly and efficiently reduce the formaldehyde content in the phenolic resin aqueous solution to 0.2%, and meets relevant national standards. Compared with the prior art, the processing effect is better, more convenient and quicker, and the cost is lower, and it is suitable for large-scale promotion.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to a method for removing free formaldehyde in an aqueous solution of phenolic resin. Background technique [0002] Phenolic resin is one of the most classic synthetic resins. Due to the easy availability of raw materials, simple production process and equipment, and the product has excellent mechanical properties, it is now widely used in adhesives, wood-based panels, friction materials, refractory materials, etc. field. Phenolic resin is a polymer compound formed by polycondensation of phenolic compounds and aldehyde compounds, among which phenolic resins synthesized by condensation polymerization of phenol and formaldehyde are the most common. However, during the synthesis process, the excessively added formaldehyde raw material cannot react completely, thus remaining in the product and subsequent products, and slowly dissipating into the air, causing harm to people's living en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G8/10
CPCC08G8/10
Inventor 陈雅莹王鹏飞周永贤
Owner SHANGHAI LVQIANG NEW MATERIALS CO LTD
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