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A kind of wood adhesive resin and preparation method thereof

A technology of wood adhesives and adhesives, applied in adhesives, adhesive types, aldehyde/ketone condensation polymer adhesives, etc., can solve the problems of slow depolymerization and release of formaldehyde, long-term potential threats to human health, and chemical stability of polycondensation structures Low-level problems, achieve the effects of reducing the amount of formaldehyde used, lowering the curing temperature, and excellent water resistance

Active Publication Date: 2022-07-01
SOUTHWEST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Free formaldehyde can be released in a short period of time, but due to the low chemical stability of the polycondensation structure, it is a slow process to gradually depolymerize and release formaldehyde during the service cycle, posing a long-term potential threat to human health

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] Specifically, the preparation method of the wood adhesive resin provided by the present invention may include the following steps:

[0020] Step 1. Mix urea and ethylenediamine in the reaction vessel at room temperature, and control the molar ratio of urea to ethylenediamine to be 2.0 to 2.5; continue to stir the reactants, continue to heat up to 110 ° C in an oil bath, and in 110°C for the heat preservation reaction, and the ammonia gas absorption device was used to absorb the overflowing ammonia gas during the reaction; when the reactant in the reaction vessel changed from liquid to solid, the stirring was stopped, and the temperature of the oil bath was raised to 115°C, and the heat preservation reaction was continued. After 3 hours, the reaction was cooled to give a white solid.

[0021] In step 2, the white solid obtained in step 1 is taken out, smashed into granules, placed in an open container, and deaminated at a temperature of 60° C. for 5 hours to obtain urea-...

Embodiment 1

[0032] It is synthesized with urea, ethylenediamine and formaldehyde as raw materials, wherein:

[0033] a. Under stirring, urea (U) and ethylenediamine (E) are mixed in the reaction vessel at room temperature, and the molar ratio U / E of urea and ethylenediamine is controlled to be 2.0, and the temperature is continued to be raised to 110 ° C in an oil bath, Insulation reaction, the ammonia gas absorption device is used to absorb the overflowing ammonia gas during the reaction process. When the reaction solution in the container changed from liquid to solid, the stirring was stopped, and the temperature of the oil bath was raised to 115° C. at the same time, and the reaction was continued for 3 hours. On cooling, the product was obtained as a white solid.

[0034] b. Take out the white solid, smash into granules, place in an open container, and deaminate at 60° C. for 5 hours to obtain urea-ethylenediamine polyurea, which is ready for use.

[0035] c. Calculate the amount of...

Embodiment 2

[0038] It is synthesized from urea, ethylenediamine and formaldehyde odor raw materials, wherein:

[0039] a. Under stirring, urea (U) and ethylenediamine (E) are mixed in the reaction vessel at room temperature, and the molar ratio U / E of urea and ethylenediamine is controlled to be 2.2, and the temperature is continued to be raised to 110° C. in an oil bath, Insulation reaction, the ammonia gas absorption device is used to absorb the overflowing ammonia gas during the reaction process. When the reaction solution in the container changed from liquid to solid, the stirring was stopped, and the temperature of the oil bath was raised to 115° C. at the same time, and the reaction was continued for 3 hours. On cooling, the product was obtained as a white solid.

[0040] b. Take out the white solid, smash into granules, place in an open container, and deaminate at 60° C. for 5 hours to obtain urea-ethylenediamine polyurea, which is ready for use.

[0041] c. Calculate the amount ...

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Abstract

The invention provides a novel wood adhesive resin and a preparation method thereof, belonging to the technical field of wood adhesives. The name of the prepared adhesive resin is urea-ethylenediamine-formaldehyde resin. The preparation raw materials include: ethylenediamine, urea and formaldehyde; the molar ratio of urea to ethylenediamine is 2.0-2.5; the molar ratio of formaldehyde to urea is 0.85-1.0. In the preparation process, firstly, ethylenediamine and urea are subjected to deamination condensation reaction under solvent-free and catalyst-free conditions to synthesize urea-ethylenediamine polyamide, and then urea-ethylenediamine polyamide and formaldehyde are synthesized to obtain the product. The final wood adhesive resin; the appearance of the finally prepared wood adhesive resin is a milky white uniform liquid, the solid content is 60-65%, and the storage period is more than 7 days. The urea-ethylenediamine-formaldehyde resin wood adhesive provided by the invention has a simple synthesis method, and has the advantages of low curing temperature, excellent performance, low formaldehyde emission and the like, and can be used for the production of wood-based panels such as plywood and particleboard.

Description

technical field [0001] The application belongs to the technical field of wood adhesives, and in particular, relates to a wood adhesive resin and a preparation method thereof. Background technique [0002] Urea-formaldehyde resin (UF) has become the most used wood adhesive resin in the wood-based panel industry due to its huge cost advantage. However, urea-formaldehyde resin has significant defects such as poor durability of glued products and large release of formaldehyde. With the progress of society, people's awareness of health and environmental protection is increasing day by day, countries around the world have successively issued strict formaldehyde emission standards for wood-based panel products, which makes the application of urea-formaldehyde resin face severe challenges. In order to reduce the formaldehyde emission of wood-based panels, a low molar ratio synthesis process is generally used at present. The molar ratio of formaldehyde to urea even dropped to the t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G12/12C08G12/06C09J161/24
Inventor 李涛洪杜官本曹明张本刚周晓剑杨龙肖辉
Owner SOUTHWEST FORESTRY UNIVERSITY
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