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MDF(Medium-density fiber)-E1-level urea-formaldehyde resin adhesive

A urea-formaldehyde resin and adhesive technology, applied in adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problems of reducing the bonding strength of wood-based panels, increasing product costs, and reducing market competitiveness. It is beneficial to product quality, improves water resistance, and reduces the effect of formaldehyde emission

Active Publication Date: 2012-11-14
广西高林林业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can effectively reduce the release of free formaldehyde from wood-based panels, it often reduces the bonding strength of wood-based panels at the same time. In addition, the price of general formaldehyde scavenger is much higher than that of urea-formaldehyde resin adhesives. Therefore, the addition of formaldehyde scavenger will increase the product cost. , the market competitiveness of the product itself is reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Raw material components The mass percentage of each component in the total glue mass formaldehyde 27.913% urea 69.782% Triethanolamine 0.005% Borax 0.800% Melamine 1.500%

[0019] The urea-formaldehyde resin adhesive of production 1000kg adds 754.402kg of 37% formaldehyde aqueous solution to the reactor, adds 0.051kg of 98% triethanolamine, and adjusts pH=8.0. Heat the reactor with steam and adjust the temperature of the reactor. When the reaction solution reaches 30°C, add the first batch of 227.860kg of 98% urea and 8.421kg of 95% borax. The temperature was raised to 85°C, and the reaction was maintained for 30 minutes, and then cooling water was turned on to cool the reaction solution to 80°C. Adjust the pH to 2.5, and measure the viscosity of the reaction solution every ten minutes at 25°C with a Tu-4 cup. When the viscosity of the reaction solution reaches 20 seconds, immediately adjust the pH to 8.0 to terminate the pol...

Embodiment 2

[0021] Raw material components The mass percentage of each component in the total glue mass formaldehyde 27.90% urea 69.75% Triethanolamine 0.05% Borax 0.80% Melamine 1.50%

[0022] To produce 1000kg of urea-formaldehyde resin adhesive, add 754.054kg of 37% formaldehyde solution to the reactor, add 0.510kg of 98% triethanolamine, and adjust the pH to 8.0. Heat the reactor with steam and adjust the temperature of the reactor. When the reaction solution reaches 30°C, add the first batch of 227.755kg of 98% urea and 8.421kg of 95% borax. The temperature was raised to 85°C, and the reaction was maintained for 30 minutes, and then cooling water was turned on to cool the reaction solution to 80°C. Adjust the pH to 2.5, and measure the viscosity of the reaction solution every ten minutes at 25°C with a Tu-4 cup. When the viscosity of the reaction solution reaches 20 seconds, immediately adjust the pH to 8.0 to terminate the polycondensatio...

Embodiment 3

[0024] Raw material components The mass percentage of each component in the total glue mass formaldehyde 29.95% urea 66.55% Triethanolamine 0.50% Borax 1.00% Melamine 2.00%

[0025] To produce 1000kg of urea-formaldehyde resin adhesive, add 809.413kg of 37% formaldehyde solution to the reactor, add 5.102kg of 98% triethanolamine, and adjust the pH to 8.5. Heat the reactor with steam and adjust the temperature of the reactor. When the reaction solution reaches 30°C, add the first batch of 203.730kg of 98% urea and 10.526kg of 95% borax. Raise the temperature to 90°C and maintain the reaction for 25 minutes, then turn on cooling water to lower the temperature of the reaction solution to 85°C. Adjust the pH to 3.0, and measure the viscosity of the reaction solution every ten minutes at 25°C with a Tu-4 cup. When the viscosity of the reaction solution reaches 22 seconds, immediately adjust the pH to 8.5 to terminate the polycondensation...

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Abstract

The invention provides an MDF (medium density fiber)-E1-level urea-formaldehyde resin adhesive. Formaldehyde and urea are used as main materials; and urea is added by three batches, and the molar ratio of formaldehyde to urea is controlled to be respectively (2.4-3.0) to 1, (1.3-1.5) to 1, and (0.8-1.0) to 1 after each batch of urea is added. The glue preparation process adopts a weak base-medium strong acid-weak base reaction path, and the materials are reacted in three mediums of which the pH is 8.0-8.5, 2.5-3.5 and 8.0-8.5, respectively to finally prepare the MDF-E1-level urea-formaldehyde resin adhesive. By using the MDF-E1-level urea-formaldehyde resin adhesive to prepare an El-level medium-density fiber board, the effect of reducing the formaldehyde emission can be achieved without adding a formaldehyde catching agent or carrying out post ammonia water treatment.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to a method for producing E 1 Urea-formaldehyde resin adhesive for medium density fiberboard. Background technique [0002] Urea-formaldehyde resin adhesive is a thermosetting resin synthesized by polycondensation reaction of urea and formaldehyde. It is currently widely used in wood processing and finishing industries, especially as an adhesive in particleboard, plywood, fiberboard and other wood processing industries, accounting for 80% of the total amount of adhesives in this industry. %above. However, in the process of using urea-formaldehyde resin adhesives for board making and wood-based board decoration, a large amount of free formaldehyde will be released, which can irritate people's eyes and respiratory system, endanger human health, and cause serious environmental pollution. Formaldehyde release from wood-based panels mainly comes from: ① unreacted free formaldehyde in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J161/30C08G12/38
Inventor 梁杰培黄家毅黄海炎朱胜碧陈一文叶启玲
Owner 广西高林林业股份有限公司
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