Preparation method of modified phenolic resin

A phenolic resin, modification technology, applied in the field of preparation of modified phenolic resin, can solve the problems of poor water solubility of modified phenolic resin, unfavorable on-site construction, complicated preparation process, etc., achieve high strength, improve brittleness, and good water solubility Effect

Active Publication Date: 2012-11-14
SHANDONG SHENGQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The first technical problem to be solved by the present invention is that the modified phenolic resin produced by cardanol in the prior art has poor water solubility, which is not conducive to on-site construction, and the preparation process is complicated and the cost is high
[0005] The second technical problem to be solved by the present invention is that the phenolic resin prepared by sulfonation of phenol in the prior art has the disadvantages of high brittleness and low strength when used for spraying

Method used

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  • Preparation method of modified phenolic resin
  • Preparation method of modified phenolic resin
  • Preparation method of modified phenolic resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take 100g of phenol, 5g of cardanol, 4g of 50% concentrated sulfuric acid and chlorosulfonic acid, put them in a reaction kettle, stir and mix, adjust the pH to 7.5 with sodium hydroxide, raise the temperature to 80°C, react for 3h, then cool down to 50°C ℃, add 38g formaldehyde, react for 1h, and obtain mixture A;

[0024] Take 100g of lignin and 150g of formaldehyde, put them in a reaction kettle, stir and mix them, adjust the pH to 7.5 with sodium hydroxide, raise the temperature to 50°C, and keep the temperature for 5 hours to obtain mixture B, which is hydroxymethylated lignin;

[0025] Mix mixture A and mixture B at a mass ratio of 1:7, raise the temperature to 70°C, and keep the temperature constant for 2 hours to obtain a modified phenolic resin.

Embodiment 2

[0027] Take 100g of phenol, 30g of cardanol, 20g of 50% concentrated sulfuric acid and sodium sulfite, put them in a reaction kettle, stir and mix, adjust the pH to 10 with sodium hydroxide, raise the temperature to 95°C, react for 1h, then cool down to 60°C, Add 137g formaldehyde, react for 3h, obtain mixture A;

[0028] Take 100g of lignin and 350g of formaldehyde, put them in a reaction kettle, stir and mix them, adjust the pH to 10 with sodium hydroxide, raise the temperature to 100°C, and keep the temperature for 3 hours to obtain mixture B, which is hydroxymethylated lignin;

[0029] Mix mixture A and mixture B at a mass ratio of 1:9, raise the temperature to 90°C, and keep the temperature constant for 1 hour to obtain a modified phenolic resin.

Embodiment 3

[0031] Take 100g of phenol, 17.5g of cardanol, and 12g of sodium sulfite, put them in a reaction kettle, stir and mix, adjust the pH to 8 with sodium hydroxide, raise the temperature to 90°C, react for 2h, then cool down to 55°C, add 87.5g of formaldehyde, and react 2h, obtain mixture A;

[0032] Take 100g of lignin and 250g of formaldehyde, put them in a reaction kettle, stir and mix them, adjust the pH to 8.5 with sodium hydroxide, raise the temperature to 75°C, and keep the temperature for 2 hours to obtain mixture B, which is hydroxymethylated lignin;

[0033] Mix mixture A and mixture B at a mass ratio of 1:8, raise the temperature to 80°C, and keep the temperature constant for 2 hours to obtain a modified phenolic resin.

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PUM

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Abstract

The invention discloses a preparation method of modified phenolic resin, which comprises the following steps of: (a) mixing phenol, cardanol and a sulfonating agent, raising the temperature to 80-95 DEG C under the alkaline condition, reacting for 1-3 hours, then cooling to 50-60 DEG C, adding formaldehyde and reacting for 1-3 hours to obtain a mixture A; (b) mixing lignin with formaldehyde, raising the temperature to 50-100 DEG C under the alkaline condition, maintaining the constant temperature for 3-5 hours to obtain a mixture B, i.e. methylolated lignin; and (c) mixing the mixture A with the mixture B, controlling the temperature to be 70-90 DEG C and maintaining the constant temperature for above 1 hour to obtain the modified phenolic resin. The preparation method has the beneficial effects that as sulfonic acid groups are introduced in cardanol molecules through sulfonation reaction, the polarity of cardanol molecules is improved, so that the water solubility of the cardanol molecules is increased; and the obtained modified phenolic resin can be directly used for the spraying industry.

Description

technical field [0001] The invention relates to the field of phenolic resins, in particular to a preparation method of modified phenolic resins. Background technique [0002] Cardanol is extracted from natural cashew nut shell oil by advanced technology, and can replace or partially replace phenol to make epoxy curing agent, liquid phenolic resin, liquid or powdered thermosetting phenolic resin. Because it belongs to renewable resources and has a wide source of raw materials, it has been widely used. One of the important applications is the production of copper-clad laminates through cardanol-modified phenolic resins. For example, Chinese patent document CN102408672A discloses a production of cardanol-modified phenolic resins. Method, by adding phenol, cardanol, formaldehyde, triethylamine and ammonia water into the reactor to react and other steps to make modified phenolic resin, the copper clad laminate finally obtained has good flexibility; Chinese patent document CN10159...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/28C08G8/10C09D161/14
Inventor 江成真李枝芳邢介明沈剑
Owner SHANDONG SHENGQUAN NEW MATERIALS CO LTD
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