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Urea resin additive and preparation method and application thereof

A urea-formaldehyde resin and additive technology, applied in the directions of adhesive additives, polymer adhesive additives, non-polymer adhesive additives, etc., can solve the problems of reducing the efficiency and mechanical properties of urea-formaldehyde resin production of wood-based panels, and achieve formaldehyde elimination. Long-lasting effect, lower formaldehyde emission, convenient use effect

Inactive Publication Date: 2012-03-28
BEIJING FORESTRY UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The primary purpose of the present invention is to provide a urea-formaldehyde resin additive that can be directly added to the urea-formaldehyde resin adhesive for the problems existing in the prior art. The formaldehyde elimination rate of the additive is high and the effect is long-lasting, without reducing the efficiency of the urea-formaldehyde resin to produce wood-based panels. and mechanical properties, fundamentally eliminate the formaldehyde pollution problem in indoor air caused by wood-based panels and their products

Method used

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  • Urea resin additive and preparation method and application thereof
  • Urea resin additive and preparation method and application thereof
  • Urea resin additive and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Prepare raw materials according to the following weight ratio

[0033] Water-emulsion epoxy resin (50% solid content): 200kg

[0034] Distilled water: 300kg

[0035] Borax: 0.5kg

[0036] Urea: 300kg

[0037] Sodium hydroxide solution (concentration 30%): appropriate amount

[0038] Formic acid solution (concentration 20%): appropriate amount

[0039] 2. Add distilled water, borax, and urea to the reaction kettle in turn, start stirring, raise the temperature to 40°C, stir well, and adjust the pH value of the reaction solution to 5.0-5.5 with formic acid;

[0040] 3. Raise the temperature to 70-72°C, react for 30 minutes, adjust the pH value to 6.0-8.0 with sodium hydroxide, cool down to 30°C, and discharge.

[0041] Table 1 Technical indicators of urea-formaldehyde resin additive products

[0042]

Embodiment 2

[0044] 1. Prepare raw materials according to the following weight ratio

[0045] Water-soluble epoxy resin (50% solid content): 300kg

[0046] Deionized water: 800kg

[0047] Borax: 1kg

[0048] Urea: 600kg

[0049] 2. The synthesis process is the same as in Example 1.

[0050]

[0051] Table 2 Technical indicators of urea-formaldehyde resin additive products

[0052]

Embodiment 3

[0054] 1. Prepare raw materials according to the following weight ratio:

[0055] Waterborne epoxy resin (50% solid content): 500kg

[0056] Water: 1000kg

[0057] Borax and calcium metaborate (1:1 mix): 8kg

[0058] Urea: 1000kg

[0059] 2. The synthesis process is the same as in Example 1.

[0060]

[0061] Table 3 Technical indicators of urea-formaldehyde resin additive products

[0062]

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Abstract

The invention discloses a urea resin and a preparation method thereof. The urea resin additive comprises the following raw materials in parts by weight: 100-300 parts of waterborne epoxy resin (solid), 100-1000 parts of urea, 50-1000 parts of water and 0.1-10 parts of stabilizing agent. The preparation method comprises the following steps: 1) adding the raw materials to a reaction kettle in sequence according to the proportion in claim 1 or 2, beginning stirring when the raw materials are added, raising the temperature and controlling the temperature at 40-60 DEG C, fully stirring the raw materials until the raw materials are uniform and regulating the pH value of the reaction liquid to be 5.0-5.5 with acid; and 2) raising the temperature to 70-72 DEG C and reacting for 30 minutes, regulating the pH value of the reaction liquid to be 6.0-8.0 with alkali, lowering the temperature to 30 DEG C and discharging the material.

Description

[0001] technical field [0002] The invention relates to a preparation for eliminating harmful chemical substances and a preparation method thereof, in particular to a preparation for eliminating formaldehyde and a preparation method thereof. [0003] Background technique [0004] With the continuous improvement of people's living standards, decoration and purchase of new furniture have become common things in people's lives. Various types of wood-based panels are often used in large quantities in decoration and furniture manufacturing, such as plywood, blockboard, medium-density fiberboard, and particle board. In 2009, the output of my country's wood-based panels has exceeded 100 million m 3 , ranked first in the world for many years in a row. However, 90% of the adhesives used in these wood-based panels are urea-formaldehyde resin and its modified products, which have the problem of formaldehyde release and often become the main source of formaldehyde pollution in indoo...

Claims

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Application Information

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IPC IPC(8): C09J11/08C09J11/06C09J11/04C09J161/24
Inventor 李建章张世锋刘江波于洋周文瑞高强
Owner BEIJING FORESTRY UNIVERSITY
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