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Urea formaldehyde condensate additive agent, production method and urea formaldehyde condensate adhesive agent

A urea-formaldehyde resin and additive technology, applied in the direction of aldehyde/ketone condensation polymer adhesives, adhesive types, adhesive additives, etc., can solve the problems of reducing the bonding strength of products, prolonging and improving curing time, etc., and reaching the manufacturing cost. Will not increase, reduce formaldehyde emission, easy to use effect

Inactive Publication Date: 2008-08-20
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, 1) Although the use of a low molar ratio modified urea-formaldehyde resin adhesive can effectively reduce the formaldehyde emission of wood-based panel products, the bonding strength of the product is often reduced, which cannot meet the requirements; the curing time is prolonged and the production efficiency is reduced; 2) the use of other Environmentally friendly adhesives, such as isocyanate adhesives, often lead to a substantial increase in the production cost of wood-based panels, which is difficult for enterprises and users to accept; 3) Adding formaldehyde scavenger to the urea-formaldehyde resin adhesive for wood-based panels can effectively reduce free formaldehyde in wood-based panels. release amount, but it often reduces the bonding strength of wood-based panels at the same time; at the same time, the price of general formaldehyde capture agents is often much higher than that of urea-formaldehyde resin adhesives, and its addition increases product costs and reduces product competitiveness. FC-5 formaldehyde scavenger sold at 50,000 yuan / ton. If 1%-2% is added to the glue, the cost of urea-formaldehyde resin per ton will increase by 500-1,000 yuan; 4) Post-treatment of wood-based panels, For example, the invention patent application with the publication number CN1526528 discloses a manufacturing process of E1 / E0 grade environment-friendly wood-based panels, using the ammonia vacuum method, and the utility model patent with the publication number CN2394770 discloses a method for reducing formaldehyde release from wood-based panels. A large amount of processing equipment, but the investment in post-processing equipment is often large

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1) Prepare materials according to the following weight ratio:

[0036] Sodium carbonate solution (mass percentage concentration 0.5%) 100kg

[0037] Tea waste 20kg

[0038] 2) Add all the tea waste into the sodium carbonate solution, stir evenly, heat to 90°C, condense and reflux, and keep it warm for 3 hours.

[0039] 3) After the temperature is lowered to 30°C, use gauze to filter the tea waste residue to obtain a tea waste extraction solution.

[0040] 4) Use a rotary evaporator (Xi'an Wantong Commercial Union R206D) to dehydrate until the solid content of the tea waste extraction solution is 30% (determined by vacuum oven drying), and adjust the pH of the concentrated solution to 7.0-7.2 with formic acid to prepare the present invention The urea-formaldehyde resin additive.

[0041] The performance indicators of the obtained additives are shown in Table 1.

[0042] 5) Preparation of urea-formaldehyde resin adhesive: the above-mentioned additives and the above-mentioned ...

Embodiment 2

[0045] Except that the weight ratio of the urea-formaldehyde resin additive tea waste extract solution of the present invention and the urea-formaldehyde resin is 5:100, the rest is the same as in Example 1.

[0046] The quality index of the prepared urea-formaldehyde resin adhesive is shown in Table 2.

Embodiment 3

[0048] 1) Prepare materials according to the following weight ratio:

[0049] Sodium carbonate solution (mass percentage concentration 2%) 100kg

[0050]Tea waste 5kg

[0051] 2) Add all the tea waste into the sodium carbonate solution, stir evenly, heat to 80°C, condense and reflux, and keep it warm for 4 hours.

[0052] 3) Then, the temperature is lowered to 30°C, and the waste tea is filtered with gauze to obtain a tea waste extraction solution.

[0053] 4) After using Xi'an Wantong Commercial Union R206D rotary evaporator to dehydrate the tea waste extraction solution to a solid content of 35% (determined by vacuum oven drying), adjust the pH of the tea waste extraction concentrate with formic acid to 7.0-7.2 , The urea-formaldehyde resin additive of the present invention is prepared.

[0054] The performance indicators of the obtained additives are shown in Table 1.

[0055] 5) Preparation of urea-formaldehyde resin adhesive: the above-mentioned additives and the above-mentio...

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PUM

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Abstract

The invention relates to a urea resin additive used in hard boards and a urea resin binder which comprises the additive and a preparation method thereof; the additive comprises substances which are dipped in and extracted from tea scraps and can eliminate formaldehyde; the extracting steps comprise steps of dipping and extracting the tea scraps by utilizing alkaline solution, filtering the tea scraps to obtain a filtrate and adjusting the ph value of the filtrate. By mixedly using the extracts of the tea scraps and the urea resin gel, the tea scrap extracts is led to be chemically reacted with the formaldehyde in the heat pressing process of the hard board, thus reducing the releasing amount of the formaldehyde of the hard board and having remarkable and durable effect without rebound; furthermore, the mechanical property of the prepared hard board is improved instead of being reduced.

Description

Technical field [0001] The invention relates to an additive for an adhesive, an adhesive containing the additive and a preparation method thereof, in particular to an additive for a urea-formaldehyde resin adhesive for wood-based panels and a urea-formaldehyde resin adhesive containing the additive and a preparation method thereof method. Background technique [0002] In the past 30 years of reform and opening up, my country's timber industry has developed rapidly. In 2006, the output value of my country's wood-based panels was 127 billion yuan, and the total output of wood-based panels was 74,285,600 cubic meters, of which plywood was 27,287,800 cubic meters, fiberboard was 24,666,000 cubic meters, particleboard was 8,432,600 cubic meters, and blockboard was 11.55 million cubic meters. The total output of wood-based panels, the output of plywood and the increased production capacity of medium-density fiberboard in the past four years rank first in the world. Wood floor productio...

Claims

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Application Information

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IPC IPC(8): C08L61/24C08K11/00C09J161/24C09J11/06
Inventor 李建章周文瑞董金宝母军张德荣范东斌江进学
Owner BEIJING FORESTRY UNIVERSITY
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