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 effect of preventing the formation of gel, less environmental pollution and long storage period

Inactive Publication Date: 2011-01-19
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 thermosetting phenolic resin with low environmental pollution, long storage period, convenient transportation and use, and a solid thermosetting phenolic resin at room temperature. Synthetic method of resin

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
Comparison scheme
Effect test

Embodiment 1

[0027] Take 1 mole of the raw material phenol used in the preparation of solid thermosetting phenolic resin as an example. Other raw materials used and their proportioning and preparation methods are as follows:

[0028] 1. Ingredients

[0029] Take 94g of phenol, 146g of formaldehyde with a mass concentration of 37%, and 11.20g of potassium hydroxide into a 500mL 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 reacted at constant temperature for 4 hours.

[0032] 3. Vacuum dehydration

[0033] After the reaction, put the product into a vacuum drying oven with a vacuum degree of -0.07MPa, and dry it 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, which is solid at room temperature, uses an automati...

Embodiment 2

[0043] Take 1 mole of the raw material phenol used in the preparation of solid thermosetting phenolic resin as an example. Other raw materials used and their proportioning and preparation methods are as follows:

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

Embodiment 3

[0046] Take 1 mole of the raw material phenol used in the preparation of solid thermosetting phenolic resin as an example. Other raw materials used and their proportioning and preparation methods are as follows:

[0047] Take 94g of phenol, 243.24g of formaldehyde with a mass concentration of 37%, and 21.28g of potassium hydroxide into a 500mL three-necked flask, and stir evenly, that is, the molar ratio of phenol to formaldehyde and alkali is 1:3.0:0.38. The other steps are the same as in Example 1, to prepare a solid thermosetting phenolic resin 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 synthetic method of resin, in particular to a synthetic method of thermosetting phenolic resin which is solid at normal temperature. Background technique [0002] Phenolic resin is a synthetic resin obtained by polycondensation of phenols and aldehydes. According to its process formula, it is divided into two categories: thermosetting phenolic resin and linear thermoplastic phenolic resin. As the oldest synthetic resin, phenolic resin is widely used because of its high mechanical strength, good heat resistance, flame retardant, low toxicity, low smoke, and can be blended with other polymers to achieve high performance. Molding compounds, coatings, friction materials, casting resins, adhesives, foam plastic semiconductor packaging materials, photoresist and other fields. Driven by the rapid development of the global economy, the rapid development of the automobile industry, metallurgy, and consumer electronics has promoted t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G8/10C08G8/22
Inventor 刘春玲张文发董文生
Owner SHAANXI NORMAL UNIV
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