Synthesis method of thermosetting phenol-formaldehyde resin in solid at normal temperature

A technology of phenolic resin and synthesis method, applied in the field of resin synthesis, to achieve the effects of high methylol content, long storage period, convenient transportation and use

Inactive Publication Date: 2009-12-09
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the above-mentioned preparation method of thermosetting phenolic resin, and provide a kind of therm

Method used

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  • Synthesis method of thermosetting phenol-formaldehyde resin in solid at normal temperature
  • Synthesis method of thermosetting phenol-formaldehyde resin in solid at normal temperature
  • Synthesis method of thermosetting phenol-formaldehyde resin in solid at normal temperature

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Taking 1 mole of the raw material phenol used for preparing the solid thermosetting phenolic resin at room temperature as an example, other raw materials and their proportioning and preparation methods are as follows:

[0028] 1. Ingredients

[0029] Take 94 g of phenol, 146 g of formaldehyde with a mass concentration of 37%, and 11.20 g of potassium hydroxide into a 500 mL three-necked flask, and stir evenly, that is, the molar ratio of phenol to formaldehyde and alkali is 1:1.8:0.2.

[0030] 2. Reflux reaction

[0031] The reactant was heated to 65°C under stirring, and the reaction was performed at a constant temperature for 4 hours.

[0032] 3. Vacuum dehydration

[0033] After the reaction, the resultant was put into a vacuum drying box with a vacuum degree of -0.07 MPa, and dried at 85° C. for 2.5 hours to prepare a solid thermosetting phenolic resin at room temperature.

[0034] 4. Characterization

[0035] The prepared thermosetting phenolic resin is solid a...

Embodiment 2

[0043] Taking 1 mole of the raw material phenol used for preparing the solid thermosetting phenolic resin at room temperature as an example, other raw materials and their proportioning and preparation methods are as follows:

[0044] Take 94 g of phenol, 81.08 g of formaldehyde with a mass concentration of 37%, and 1.12 g of potassium hydroxide into a 500 mL three-necked flask, and stir evenly, that is, the molar ratio of phenol to formaldehyde and alkali is 1:1.0:0.02. Other steps are the same as in Example 1, and the thermosetting phenolic resin is prepared as a solid at room temperature.

Embodiment 3

[0046] Taking 1 mole of the raw material phenol used for preparing the solid thermosetting phenolic resin at room temperature as an example, other raw materials and their proportioning and preparation methods are as follows:

[0047] Take 94 g of phenol, 243.24 g of formaldehyde with a mass concentration of 37%, and 21.28 g of potassium hydroxide into a 500 mL three-necked flask, and stir evenly, that is, the molar ratio of phenol to formaldehyde and alkali is 1:3.0:0.38. Other steps are the same as in Example 1, and the thermosetting phenolic resin is prepared as a solid at room temperature.

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Abstract

A synthesis method of thermosetting phenol-formaldehyde resin in solid at normal temperature comprises mixing, reflux reaction, and vacuum dehydration. The invention adopts phenol or cresol and aldehyde compound as reactant and alkali as catalyst, preparation parameters is regulated and hydroxymethyl generation speed is controlled to avoid excessive hydroxymethyl existing in the reaction system and gel production, and the thermosetting phenol-formaldehyde resin in solid at normal temperature with 0.4-0.6 hydroxymethyl content is prepared. Compared with the prior preparation method of phenol-formaldehyde resin, the invention has the advantages that gel production is difficult in synthesis process, the synthetic thermosetting phenol-formaldehyde resin is high in hydroxymethyl content, low in free phenol content and is solid at normal temperature, and environmental pollution is less, storage period is long, transportation and use are convenient, etc. The method of the invention can be used for synthesizing solid thermosetting phenol-formaldehyde.

Description

technical field [0001] The invention relates to a method for synthesizing resin, in particular to a method for synthesizing a thermosetting phenolic resin that is solid at room temperature. Background technique [0002] Phenolic resin is a synthetic resin obtained by polycondensation of phenols and aldehydes. According to their different process formulas, they are divided into two categories: thermosetting phenolic resins and linear thermoplastic phenolic resins. As the oldest synthetic resin, phenolic resin is widely used because of its high mechanical strength, good heat resistance, flame retardancy, low toxicity and low smoke, and can be blended with other polymers to achieve high performance. Molding compounds, coatings, friction materials, casting resins, adhesives, foamed plastic semiconductor packaging materials, photoresists and other fields. Driven by the rapid development of the global economy, the rapid development of the automotive industry, metallurgy, and ele...

Claims

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Application Information

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IPC IPC(8): C08G8/10C08G8/22
Inventor 刘春玲张文发董文生
Owner SHAANXI NORMAL UNIV
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