Preparation method of water-soluble phenolic resin

A technology of water-soluble phenolic resin and formaldehyde, which is applied in the field of thermosetting phenolic resin, and can solve problems such as difficult control of the reaction

Inactive Publication Date: 2020-04-10
SHANGHAI INST OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] In the traditional sense, the feeding method of synthesizing water-soluble phenolic resin is mainly to add formaldehyde, phenol and catalyst together for reaction, and control the reaction time and reaction temperature to realize the water-based phenolic resin. This feeding method is simple in process, but the reaction is not easy to control

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  • Preparation method of water-soluble phenolic resin
  • Preparation method of water-soluble phenolic resin
  • Preparation method of water-soluble phenolic resin

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preparation example Construction

[0037] A preparation method of water-soluble phenolic resin, comprising the following steps:

[0038] (1) Heating the phenol, the temperature is gradually raised and part of the catalyst is added simultaneously until the temperature rises to the first reaction temperature and the catalyst is added;

[0039] (2) heat preservation reaction at the first reaction temperature, then dropwise add part of formaldehyde and heat up to the second reaction temperature heat preservation reaction, then add the catalyst of the remaining part, continue to heat up to the third reaction temperature;

[0040] (3) heat insulation reaction at the third reaction temperature, then add the remaining part of formaldehyde and heat up to the fourth reaction temperature and keep the temperature, terminate the reaction, wait to be cooled below the fifth reaction temperature, carry out dehydration under reduced pressure under stirring to obtain the described Water-soluble phenolic resin;

[0041] Describe...

Embodiment 1

[0069] In this embodiment, a synthesis process for preparing water-soluble phenolic resin is determined by adjusting the addition method and reaction temperature of the added materials. Its raw materials include phenol, formaldehyde and sodium hydroxide, wherein 0.2 mol of phenol, 0.5 mol of formaldehyde and 0.06 mol of sodium hydroxide are added.

[0070] A preparation method for preparing a water-soluble phenolic resin by adjusting the addition mode and reaction temperature of the added materials, the specific steps are as follows:

[0071] (1) Preheat and melt the phenol first, weigh the phenol in a four-necked flask equipped with an electric stirrer, a reflux condenser, and a thermometer according to the molar ratio of phenol, formaldehyde, and sodium hydroxide of 1:2.5:0.3, and turn on the electric Stirrer and water bath heating;

[0072] (2) Raise the temperature gradually and add 2 / 3 of the catalyst sodium hydroxide at the same time until the temperature rises to 50°C ...

Embodiment 2

[0076] In the embodiment of the present invention, a synthesis process for preparing water-soluble phenolic resin is determined by adjusting the addition method and reaction temperature of the added materials. Its raw materials include phenol, formaldehyde and sodium hydroxide, wherein 0.2 mol of phenol, 0.4 mol of formaldehyde and 0.06 mol of sodium hydroxide are added.

[0077] A preparation method for preparing a water-soluble phenolic resin by adjusting the addition mode and reaction temperature of the added materials, the specific steps are as follows:

[0078] (1) Preheat and melt the phenol first, weigh the phenol in a four-necked flask equipped with an electric stirrer, a reflux condenser, and a thermometer according to the molar ratio of phenol, formaldehyde, and sodium hydroxide of 1:2.0:0.3, and turn on the electric Stirrer and water bath heating;

[0079] (2) Raise the temperature gradually and add 2 / 3 of the catalyst sodium hydroxide at the same time until the te...

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Abstract

The invention relates to a preparation method of water-soluble phenolic resin. The preparation method comprises the following steps: (1) heating phenol, gradually raising the temperature and adding apart of catalyst simultaneously until the temperature is raised to a first reaction temperature and the addition of the catalyst is finished; (2) carrying out a heat preservation reaction at the firstreaction temperature, then dropwise adding a part of formaldehyde, heating to a second reaction temperature, carrying out a heat preservation reaction, adding the rest of the catalyst and continuously heating to a third reaction temperature; and (3) carrying out a heat preservation reaction at the third reaction temperature, adding the rest formaldehyde, heating to a fourth reaction temperature,carrying out heat preservation, terminating the reaction and carrying out reduced pressure dehydration while stirring to obtain the water-soluble phenolic resin when the temperature is reduced to below the fifth reaction temperature, wherein sodium hydroxide is used as the catalyst. Compared with the methods in the prior art, the water-soluble phenolic resin which is high in water solubility and low in content of free phenol and free aldehyde is prepared.

Description

technical field [0001] The invention belongs to the technical field of thermosetting phenolic resins, in particular to a preparation method of water-soluble phenolic resins. Background technique [0002] As one of the three thermosetting resins, phenolic resin (PF) is a polymer compound synthesized by phenols and aldehydes under the action of a catalyst. It is the earliest resin synthesized by humans and has many excellent properties, such as thermal Stability, flame retardancy, char retention, electrical insulation and mechanical strength. They are widely used as ablative materials, refractory materials, foam materials, carbon materials and friction materials. According to the type of catalyst involved in the reaction and the ratio of phenol and aldehyde, it can be divided into thermoplastic and thermosetting phenolic resins. Phenolic resin has some basic characteristics of polymer compounds, and can be made into linear, branched, and cross-linked phenolic resins under di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/10
CPCC08G8/10
Inventor 王磊谢大祥孟凡帅刘倩李书珍
Owner SHANGHAI INST OF TECH
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