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Preparation method of phenolic resin

A technology of phenolic resin and phenolic compound, which is applied in the field of preparation of phenolic resin, can solve the problems of non-hardness, high emulsion toughness, and low strength, and achieve the effect of solving the influence of resin color, prolonging the use time, and improving usability

Inactive Publication Date: 2014-06-04
SHANDONG SHENGQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since phenolic resins contain a large amount of phenolic hydroxyl groups, during the storage of phenolic resins, especially liquid thermosetting phenolic resins, they are easily oxidized into quinones, causing the color of the resin to turn red; more seriously, when the resin is cured at high temperature During the process, due to more exposure to oxygen, the phenolic hydroxyl group is more likely to be oxidized into quinones, the longer the time, the higher the temperature, and the darker the color after curing
Moreover, as time goes by during use, the color of the resin will become darker due to oxidation
These shortcomings have seriously restricted the application of phenolic resin in some related fields that require light color or high product color and good durability.
[0006] In the prior art, manufacturers in the industry use melamine-formaldehyde resin, urea-formaldehyde resin, styrene-acrylic emulsion, acrylic emulsion and other light-colored materials instead of thermosetting phenolic resin, but because the storage period of melamine-formaldehyde resin is too short, the product is brittle; urea-formaldehyde resin is water-resistant Poor resistance and weather resistance; the emulsion has high toughness, low strength, and no hardness, which restricts the application range of the product. If the phenolic resin is modified or blended in any proportion with melamine-formaldehyde resin, urea-formaldehyde resin, or emulsion, the color of the phenolic resin It still cannot be improved, as long as a small amount of phenolic resin can make the cured color of the resin darker, if antioxidants are added, because they do not participate in the reaction of phenolic formaldehyde, the performance of the resin will be affected, thus affecting the application of phenolic resin

Method used

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preparation example Construction

[0026] The invention discloses a preparation method of phenolic resin, comprising the following steps:

[0027] A) under the action of a basic catalyst, the phenolic compound, the aldehyde compound, the reducing agent and the boron-containing compound are subjected to a first reaction to obtain a reaction mixture;

[0028] B) performing a second reaction on the reaction mixture obtained in the above step A) with a nitrogen-containing compound to obtain a phenolic resin.

[0029] In the present invention, under the action of the basic catalyst, the phenolic compound, the aldehyde compound, the reducing agent and the boron-containing compound are subjected to the first reaction to obtain a reaction mixture, and then the second reaction is carried out with the nitrogen-containing compound to obtain the phenolic resin. In the present invention, during the phenolic reaction process, specific proportions of boron-containing compounds, reducing compounds and nitrogen-containing compo...

Embodiment 1

[0048] First, put 1000kg of phenol, 450kg of formaldehyde solution with a mass concentration of 37%, and 9kg of sodium borohydride into the reaction kettle and mix them evenly, then add 30kg of sodium hydroxide, heat up to 60°C, and react at constant temperature for 2 hours, then add 18kg of four The sodium borate was then heated to 70° C., and the constant temperature reaction was continued for 2 hours to obtain a reaction mixture.

[0049] After mixing the above reaction mixture with 25kg of ethylenediamine, react at a temperature of 80°C. When the viscosity of the reaction product is 600cp / 25°C, stop the reaction, and then carry out vacuum distillation. When the reaction product of the above steps When the water content in the medium is 3%, stop the vacuum distillation and add 500kg of methanol. After the product obtained in the above steps is completely dissolved, the temperature is finally lowered to 35°C to obtain light-colored thermosetting phenolic resin 1#.

Embodiment 2

[0051] First, put 1000kg of phenol, 800kg of formaldehyde solution with a mass concentration of 37%, and 12kg of lithium aluminum hydride into the reactor and mix them evenly, then add 20kg of potassium hydroxide, heat up to 66°C, and react at constant temperature for 2 hours, then add 15kg of boric acid Then the temperature was raised to 75° C., and the constant temperature reaction was continued for 2 hours to obtain a reaction mixture.

[0052] After mixing the above reaction mixture with 25kg urea, react at a temperature of 80°C. When the viscosity value of the reaction product is 800cp / 25°C, stop the reaction, and then carry out vacuum distillation. When the reaction product of the above steps contains moisture When the content is 5%, stop the vacuum distillation and add 600kg of acetone. After the product obtained in the above steps is completely dissolved, the temperature is finally lowered to 35°C to obtain light-colored thermosetting phenolic resin 2#.

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Abstract

The invention provides a preparation method of phenolic resin. The preparation method comprises the following steps of under the action of an alkaline catalyst, carrying out first reaction on phenolic compounds, aldehyde compounds, a reducing agent and boron-containing compounds to obtain reaction mixture, then carrying out second reaction on the reaction mixture and nitrogen-containing compound to obtain phenolic resin. The preparation method provided by the invention has the advantages that the chromaticity change of the prepared phenolic resin is small in different storage periods before curing and after finish of the curing process, the original performance of the resin is also not influenced and the usability of the resin is improved.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, in particular to a preparation method of phenolic resin. Background technique [0002] Phenolic resin is a general term for resins produced by the reaction of phenols and aldehydes in the presence of catalysts. It is the earliest industrially produced polymer material. The cured phenolic resin has good physical and chemical properties and is widely used in industries, Agriculture, national defense and national economy and other aspects. [0003] Phenolic resins are often used to make molding materials, friction materials, refractory materials, laminated materials, etc. Molding materials made of phenolic resins have excellent heat resistance, insulation and mechanical properties, especially good dimensional stability. It is widely used in aerospace, naval vessels and civil ships, firearms, electronic and electrical components, and power equipment components. [0004] Phenolic resins ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/28
Inventor 江成真李枝芳张宝印隗骁健
Owner SHANDONG SHENGQUAN NEW MATERIALS CO LTD
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