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Stable liquid melamine wrea formaldehyde resins

A technology of melamine urea and formaldehyde resin, applied in the field of manufacturing melamine urea formaldehyde liquid resin and adhesive composition, can solve the problems of lack of extended storage stability, lack of wet adhesion strength and the like

Inactive Publication Date: 2004-09-08
CYTEC TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These resins either do not have good wet bond strength or adequate extended storage stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The preparation of embodiment 1 MUF liquid resin

[0049]A resin of the present invention was prepared by adding 955 grams of 44% formalin to a reaction vessel. The pH was adjusted to 8.0 to 8.5 with about 1.1 grams of 20% sodium hydroxide. The liquid in the reaction vessel was heated to 50° C., and after about 20 minutes, 423 g of urea was added. The temperature was raised to 90°C and held for 15 minutes. The reaction was then cooled to 85°C and the pH was lowered to 4.9 to 5.1 with about 1.1 grams of 10% formic acid. Viscosity was monitored using a Brookfield cone and plate viscometer at 25°C using a #42 spindle at a shear rate of 10 rpm on a 1 ml sample. When the viscosity reached 200 to 280 centipoise, the temperature of the reaction vessel was lowered to 60°C and the pH was raised to 8.4 to 8.8 with about 0.75 grams of 20% sodium hydroxide. A second batch of formalin material (610 grams of formaldehyde) was added to the mixture and the pH readjusted to 8.5 to 8...

Embodiment 2

[0050] The preparation of embodiment 2 MUF liquid resin

[0051] Several resins were prepared in a manner similar to that in Example 1. Table 1 lists the composition and preparation parameters of the MUF resin prepared according to the method in Example 1.

[0052] sample

[0053] Table 2 lists the properties of the MUF resin samples prepared according to the method of Example 1.

[0054] sample

[0055] *Baked 2 grams of resin in an oven at 105°C for 2 hours; divide the weight of the residue by 2 grams to get the total solids %

[0056] Table 3 lists the viscosity change of the MUF liquid resin prepared according to the method of Example 1.

[0057] sample

[0058] This example is shown by viscosity measurements, showing that the resins of the present invention have good stability. The results show that the viscosity of the resin does not change significantly at 25°C over an extended period.

Embodiment 3

[0059] Example 3 Aluminum chloride-based liquid suspension hardener

[0060] 167.7 grams of water and about 4.95 grams of Attagel 40 were stirred in a flask and the mixture was stirred for an additional 15 minutes. Then add about 25.9 g of AlCl 3 ·6H 2 O crystals, and the mixture was stirred for an additional 15 minutes. Then, add about 23 grams of kaolin (a kind of aluminosilicate clay, can buy from the Engelhard company of New Jersey), stir the mixture for 15 minutes and then add about 3.9 grams of Ser-AD FX 1100 to thicken the mixture, and heat the mixture at 35°C to Stir at 40°C for about 4 hours until the thickener is no longer visible on the surface of the hardener mixture. About 27.5 grams of pecan shells were added and the mixture was stirred for about 15 to 20 minutes to produce a homogeneous viscous liquid product.

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PUM

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Abstract

The invention relates to a process for preparing a liquid melamine urea formaldehyde resin that has long term stability. The invention also relates to a liquid MUF resin with a high formaldehyde and melamine content. The invention further relates to a liquid suspension hardener including a catalyst, a thickener, a filler, and water. The invention also relates to a adhesive composition for use in wood bonding that is made by adding a hardener to the resin.

Description

technical field [0001] The present invention relates to a method for producing melamine urea formaldehyde (MUF) liquid resin, a liquid suspension hardener and an adhesive composition containing these substances. In particular, the present invention relates to a MUF liquid resin which is stable over a significantly long period of time. Background technique [0002] MUF resins are widely used in the wood manufacturing industry for bonding wood or as an adhesive in the production of wood-based materials, including particleboard, plywood, various fiberboards, etc. This resin is the reaction product of urea with melamine and formaldehyde. The resin is then hardened or cured using hardeners, such as ammonium salts or acids. [0003] However, the resin usually cures rapidly within hours or minutes after the reaction between the melamine, urea and formaldehyde is complete. This curing prior to the addition of the hardener is problematic because the resin cannot be stored for late...

Claims

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Application Information

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IPC IPC(8): C08G12/38C08L61/30C09J161/30
CPCC08L61/30C08G12/38C09J161/30
Inventor H·D·朱W·雅各布斯三世R·G·利斯L·门东萨R·C·拉施
Owner CYTEC TECH CORP
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