Phenolic-resin-modified urea formaldehyde resin and preparation method thereof

A technology of phenolic resin and urea-formaldehyde resin, applied in the field of phenolic resin modified urea-formaldehyde resin and its preparation, can solve the problems of free formaldehyde release and poor water resistance, free phenol polluting the environment, small reaction equilibrium constant, etc. Easy-to-obtain and easy-to-operate effects

Active Publication Date: 2015-07-22
湖北合聚高分子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, urea-formaldehyde resin adhesives have two major disadvantages: free formaldehyde release and poor water resistance
[0005] In the above literature reports, the release of free formaldehyde from urea-formaldehyde resin is reduced mainly by controlling the molar ratio of phenol / urea / formaldehyde, batch addition of urea, reaction temperature and reaction time, and the reduction effect is also obvious, but the reaction equilibrium constant of phenol and formaldehyde is very large , the reaction rate is low, and the reaction rate of urea and formaldehyde is relatively high, but the reaction equilibrium constant is small, which causes the problem of free phenol pollution in the phenol-modified urea-formaldehyde resin prepared by the current patent report. On the other hand, the current There is also the problem of high cost caused by the large amount of phenol used in the phenolic resin modified urea-formaldehyde resin reported in the literature

Method used

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  • Phenolic-resin-modified urea formaldehyde resin and preparation method thereof
  • Phenolic-resin-modified urea formaldehyde resin and preparation method thereof

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Embodiment 1

[0030] A kind of phenolic resin modified urea formaldehyde resin, its preparation method comprises the following steps:

[0031] 1) Feed phenol and formaldehyde into the reactor at a molar ratio of 1:1.5, and stir evenly; add sodium hydroxide to the reactor, and the molar ratio of sodium hydroxide to phenol is 0.05:1; heat up to 45°C, Stirring and reacting for 4 hours; the obtained product was dehydrated to a solid content of 55% at 45°C to obtain the phenolic resin;

[0032] 2) Add 100 parts by weight of formaldehyde aqueous solution (concentration is 37wt%), 5 parts by weight of phenolic resin and 30 parts by weight of urea in the reaction vessel successively and mix uniformly, adjust the pH value to 7.5 with aqueous sodium carbonate solution, at 65 ℃ After keeping warm for 15 minutes, continue to heat up to 85°C and keep warm for 30 minutes to obtain reaction system I;

[0033] 3) Regulate step 2) the pH value of gained reaction system I with formic acid aqueous solution t...

Embodiment 2

[0036] A kind of phenolic resin modified urea formaldehyde resin, its preparation method comprises the following steps:

[0037] 1) Feed phenol and formaldehyde into the reactor at a molar ratio of 1:2, and stir evenly; add sodium hydroxide to the reactor, and the molar ratio of sodium hydroxide to phenol is 0.1:1; heat up to 60°C, Stirring and reacting for 8 hours; the obtained product was dehydrated to a solid content of 60% at 60°C to obtain the phenolic resin;

[0038] 2) In the reaction vessel, add successively 100 parts by weight of formaldehyde solution (concentration is 38wt%), phenolic resin of 15 parts by weight and the urea of ​​33 parts by weight and mix uniformly, adjust system pH value with sodium carbonate solution to be 8.0, at 70 After keeping the temperature for 30 minutes at ℃, continue to heat up to 88 ℃ and keep the temperature for 45 minutes to obtain the reaction system I;

[0039] 3) Regulate the pH value of step 2) gained reaction system I with formic...

Embodiment 3

[0042] A kind of phenolic resin modified urea formaldehyde resin, its preparation method comprises the following steps:

[0043] 1) Feed phenol and formaldehyde into the reactor at a molar ratio of 1:2.2, and stir evenly; add sodium hydroxide to the reactor, and the molar ratio of sodium hydroxide to phenol is 1:1; heat up to 75°C, Stirring and reacting for 24 hours; the obtained product was dehydrated to a solid content of 65% at 75°C to obtain the phenolic resin;

[0044] 2) In the reaction vessel, add successively the urea of ​​100 parts by weight of formaldehyde solution (concentration is 40wt%), the phenolic resin of 30 parts by weight and 37 parts by weight of urea and mix uniformly, adjust system pH value with sodium carbonate solution to be 9.0, at 75 After 45 minutes of heat preservation at ℃, continue to heat up to 92 ℃ and keep heat for 60 minutes to obtain reaction system I;

[0045] 3) Adjust the pH value of the reaction system I obtained in step 2) with formic a...

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Abstract

The invention discloses a phenolic-resin-modified urea formaldehyde resin which is prepared from a phenolic resin, formaldehyde and urea under alkali-acid-alkali technological conditions. The phenolic-resin-modified urea formaldehyde resin has favorable storage stability, and the free formaldehyde content is at most 0.01 wt%. The benzene ring introduced into the urea formaldehyde resin molecular structure enhances the reaction degree between the urea and formaldehyde, and lowers the free formaldehyde content in the reaction system. The phenolic resin used instead of phenol maximally lowers the free phenol residue and enhances the water resistance of the urea formaldehyde resin. The preparation technique is simple and easy to operate, and the prepared urea formaldehyde resin has low formaldehyde content and is suitable for the field of production of plywoods, shaving boards fiberboards and the like.

Description

technical field [0001] The invention belongs to the field of wood adhesives, and in particular relates to a phenolic resin-modified urea-formaldehyde resin and a preparation method thereof. Background technique [0002] At present, my country's wood adhesives are mainly traditional phenolic, urea-formaldehyde and melamine-formaldehyde resins. Urea-formaldehyde resin has the advantages of cheap and easy-to-obtain raw materials, simple manufacturing process, colorless and transparent, excellent adhesion to lignocellulose, and no pollution to wood. It is currently the largest variety of wood adhesives, accounting for about More than 80% of the dosage of the agent is mainly used for the bonding of plywood, particleboard, medium density fiberboard, etc. However, urea-formaldehyde resin adhesives have two major disadvantages: free formaldehyde release and poor water resistance. The application of urea-formaldehyde resin is limited. [0003] Patent CN100482708C introduces a urea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/28C08G12/40C08G8/10C09J161/14C09J161/32
Inventor 刘治田张云飞姜岚钰代梦琴张旗王成
Owner 湖北合聚高分子材料有限公司
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