Preparation method of phenol modified urea resin

A technology of urea-formaldehyde resin and phenol is applied in the field of preparation of phenol-modified urea-formaldehyde resin, which can solve the problems of serious opening, increased acidity, aging of adhesives, etc.

Active Publication Date: 2013-08-14
SHANDONG SHENGQUAN NEW MATERIALS CO LTD
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Problems solved by technology

[0004] The inventors have found that the phenol-modified urea-formaldehyde resin obtained by the synthesis process disclosed in the prior art has higher reactivity at the para-position of phenol than at the ortho-position, and the para-position of phenol is more likely to undergo an addition reaction with formaldehyde to generate p-hydroxymethylphenol; After generating p-hydroxymethylphenol, the activity of the ortho-position of the phenolic hydroxyl group will decrease significantly, and it will be more difficult to add reaction with formaldehyde, resulting in less formaldehyde consumption,

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  • Preparation method of phenol modified urea resin

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[0022] The invention provides a kind of preparation method of phenol modified urea formaldehyde resin, comprises the following steps:

[0023] a) reacting after mixing phenol, formaldehyde and a basic catalyst to obtain a reaction product, which includes a mixture of phenol alcohols and formaldehyde;

[0024] b) mixing the reaction product obtained in step a) with urea, alcohol compounds and weak acid compounds, and reacting to obtain a phenol-modified urea-formaldehyde resin.

[0025] In the method provided by the invention, firstly, phenol and formaldehyde are reacted in the presence of a basic catalyst, and then the obtained phenol-alcohol mixture is reacted with urea and an alcohol compound in the presence of a weak acid compound to obtain a phenol-modified urea-formaldehyde resin. In the above reaction process, the hydroxyl group in the alcohol compound can react with free formaldehyde to form alcohol formal, and the alcohol compound can also cross-link with the urea-for...

Embodiment 1

[0045] Mix 476g of phenol, 2081g of formaldehyde solution with a mass concentration of 37% and 10.8g of polyvinyl alcohol, then add sodium hydroxide to it to adjust the pH value of the mixed solution to 8.0, and place the resulting mixed solution with a pH value of 8.0 at 70°C Under constant temperature reaction 2h;

[0046] Then add 1080g of urea to the obtained reaction solution in 3 batches: first add 648g of the first batch of urea and then raise the temperature to 98°C, and add 16.2g of furfuryl alcohol to the reaction solution before adding 324g of the second batch of urea, and then add formic acid to adjust the reaction The pH value of the solution is 5.5, and finally the third batch of urea 108g is added to the reaction solution with a pH value of 5.5, and the phenol-modified urea-formaldehyde resin is obtained after reacting for 1 hour.

[0047] The free phenol content, moisture content, solid content, free aldehyde content, closed cell rate and storage period of the ...

Embodiment 2

[0049] 476g phenol, 2081g mass concentration are 37% formaldehyde solution and 10.8g polyvinyl alcohol mix, then add sodium hydroxide to it and adjust the pH value of the mixed solution obtained to be 8.0, the mixed solution with the obtained pH value of 8.0 in Constant temperature reaction at 70°C for 2 hours;

[0050] Then 1080g of urea was added to the obtained reaction solution in 4 batches: after the constant temperature was completed, the first batch of urea 702g was directly added to the obtained reaction solution, and then the second batch of urea 216g was added thereto. After the reaction solution was heated to 98°C, and Before adding the 3rd batch of urea 108g, add 16.2g furfuryl alcohol to the reaction solution, add formic acid to it after adding the 3rd batch of urea to adjust the pH value of the reaction solution to 5.5, and finally add the 4th batch to the reaction solution with a pH value of 5.5. Batch 54g of urea and react for 2 hours to obtain phenol-modified ...

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Abstract

The invention provides a preparation method of phenol modified urea resin. The preparation method comprises the following steps of: (a), mixing phenol, formaldehyde and an alkali catalyst for reacting to obtain reaction products, wherein the reaction products include a phenol-alcohol mixture and formaldehyde; and (b), mixing the reaction products obtained in the step (a) with urea, an alcohol compound and an weak acid compound for reacting to obtain the phenol modified urea resin. The preparation method of the phenol modified urea resin provided by the invention can be used for enabling the phenol and the formaldehyde to react in the presence of the alkali catalyst, enabling the reaction products to react with the urea and the alcohol compound under an weak acid condition, so that the alcohol compound and excessive formaldehyde react to generate alcohol formaldehyde in the reaction process; moreover, the alcohol compound further can be cross-linked with the urea resin to form macromolecules, so that the content of the free formaldehyde is lowered and the storage period is prolonged. Moreover, the phenol modified urea resin obtained by the preparation method disclosed by the invention is foamed and cured to obtain a foaming body with a higher percentage of close area.

Description

technical field [0001] The invention relates to the technical field of polymers, in particular to a preparation method of phenol-modified urea-formaldehyde resin. Background technique [0002] Urea-formaldehyde resin is a thermosetting resin synthesized from urea and formaldehyde as the main raw materials. It is a kind of amino resin and one of the oldest synthetic resins. Due to its low cost, light color, no pollution to wood, high hardness, and bond strength High, oil resistance, mildew resistance, good insulation and temperature resistance, etc., are widely used in wood processing, plywood and other industries. It accounts for more than 80% of the total in wood adhesives and occupies a very important position. However, urea-formaldehyde resin also has serious disadvantages, such as water resistance, aging resistance, poor mechanical strength, and high formaldehyde content. [0003] In the prior art, in order to overcome the shortcomings of urea-formaldehyde resins, phen...

Claims

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Application Information

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IPC IPC(8): C09J161/34C08G14/08
Inventor 邓刚彭绵广宋长啸
Owner SHANDONG SHENGQUAN NEW MATERIALS CO LTD
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