Phenol-urea-formaldehyde condensation copolymerization resin wood adhesive and preparation method thereof

A technology of wood adhesives and co-condensation resins, applied in the direction of aldehyde/ketone condensation polymer adhesives, adhesives, adhesive types, etc., can solve problems such as no public reports, and achieve high curing efficiency and low cost.

Inactive Publication Date: 2008-01-09
SOUTHWEST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Through document retrieval, do not see the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: (every part is parts by weight, gram or kilogram)

[0026] The adhesive is formed by polycondensation of phenol, urea and formaldehyde, of which:

[0027] A. The molar ratio of phenol and urea is 1: 0.1;

[0028] b. The appearance of phenol-urea-formaldehyde co-condensation resin wood adhesive is light yellow or light reddish brown liquid, the solid content is 50%, the pH is 9.0, and the storage period is more than 7 days;

[0029] The adhesive preparation method steps are as follows (the following parts are parts by weight):

[0030] a. Take 94 parts of phenol, add 0.1 mole of NaOH aqueous solution and 100 parts of 37% formaldehyde aqueous solution, add 5.4 parts of urea for the first time under stirring, and gradually heat up to 90 ° C after 10 minutes of reaction;

[0031] b. After insulated reaction at 90°C for 30 minutes, add 42 parts of formaldehyde aqueous solution for the second time, and continue the insulated reaction;

[0032] c. After the vi...

Embodiment 2

[0033] Embodiment 2: (every part is parts by weight, gram or kilogram)

[0034] The adhesive is formed by polycondensation of phenol, urea and formaldehyde, of which:

[0035] A. The molar ratio of phenol and urea is 1: 0.25;

[0036] b. The appearance of the phenol-urea-formaldehyde polycondensation resin wood adhesive is a light yellow or light reddish brown liquid, the solid content is 50%, the pH is 10.0, and the storage period is more than 7 days.

[0037] The adhesive preparation method steps are as follows (the following parts are parts by weight):

[0038] a. Take 94 parts of phenol, add 0.6 moles of NaOH aqueous solution and 100 parts of 37% formaldehyde aqueous solution, add 13.5 parts of urea for the first time under stirring, and gradually heat up to 95 ° C after 10 minutes of reaction;

[0039] b. After the heat preservation reaction at 95°C for 30 minutes, add 42 parts of formaldehyde aqueous solution for the second time, and continue the heat preservation reac...

Embodiment 3

[0041] Embodiment 3: (every part is parts by weight, gram or kilogram)

[0042] The adhesive is formed by polycondensation of phenol, urea and formaldehyde, of which:

[0043] A. the molar ratio of phenol and urea is 1: 0.9;

[0044] b. The appearance of the phenol-urea-formaldehyde polycondensation resin wood adhesive is a light yellow or light reddish brown liquid, with a solid content of 50%, a pH of 11.0, and a storage period of more than 7 days.

[0045] The adhesive preparation method steps are as follows (the following parts are parts by weight):

[0046] a. Take 94 parts of phenol, add 0.8 moles of NaOH aqueous solution and 100 parts of 37% formaldehyde aqueous solution, add 48.6 parts of urea for the first time under stirring, and gradually heat up to 99 ° C after 10 minutes of reaction;

[0047] b. After the heat preservation reaction at 99°C for 30 minutes, add 42 parts of 37% formaldehyde solution for the second time, and continue the heat preservation reaction; ...

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PUM

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Abstract

A binder of phenol-urea-methanal co-condensation polymer resin wood and its production are disclosed. The process is carried out by adding into methanal and urea under single medium environment, adding NaOH aqueous solution 0.1-0.8 mol and methanal aqueous solution with concentration 37% into melt phenol, agitating, adding into urea for the first time, reacting for 10 mins, raising temperature to 90-99 deg. C, keeping temperature, reacting for 30 mins, adding into methanal aqueous solution for the second times, keeping temperature, reacting to reach viscosity to 100-800 Pa/s, adding into urea for the second time, reacting for 20 mins, cooling and discharging. It costs low, has fast curing speed, better gluing effect and can be used to substitute phenolic resin wood binder and to produce artificial board.

Description

Technical field: [0001] The invention relates to a phenol-urea-formaldehyde co-condensation resin wood adhesive and a preparation method thereof, belonging to the technical field of wood-based panel production in wood processing. Background technique: [0002] Phenolic resin (PF) and urea-formaldehyde resin (UF) are the most important adhesives for wood-based panel production, among which phenolic resin is mainly used in the production of structural wood-based panels and outdoor wood-based panels. Although phenolic resin has a series of advantages, its curing rate is low , At the same time, the cost is high, while urea-formaldehyde resin has significant advantages such as fast curing speed and low manufacturing cost. Therefore, by introducing urea monomer to carry out phenol-urea-formaldehyde co-condensation, not only can significantly reduce the cost, but also help to improve the reaction speed of phenolic resin. [0003] Wan Xiuping [1] made a preliminary discussion on th...

Claims

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Application Information

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IPC IPC(8): C09J161/14
Inventor 杜官本雷洪方群李君郑志锋赵伟刚赵超超
Owner SOUTHWEST FORESTRY UNIVERSITY
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