Preparation methods and application of low mole ratio UF resin adhesive and high mole ratio MUF resin adhesive

Abstract

The invention belongs to the field of man-made boards, and relates to preparation methods and application of low mole ratio UF resin adhesive and high mole ratio MUF resin adhesive. The preparation method of the low mole ratio UF resin adhesive comprises the steps that urea is added for three times, and the mole ratio of formaldehyde to the sum of the urea participating reaction is 0.92-0.95; the mole ratio of the formaldehyde to the urea added in the first time is 2.0-2.2; the mole ratio of the formaldehyde to the sum of the urea added in the first time and the urea added in the second time is 1.35-1.5. The preparation method of the high mole ratio MUF resin adhesive comprises the steps that melamine is added, the urea is added for three times, and the mole ratio of the formaldehyde to the sum of all the urea and the melamine is 1.00-1.03; the mole ratio of the formaldehyde to the sum of the urea added in the first time and the melamine is 2.0-2.2, and the mole ratio of the formaldehyde to the sum of the urea added in the first time and the second time and the melamine is 1.35-1.50. The invention further discloses application of the prepared adhesive in shaving boards with the ultralow formaldehyde emission. According to the preparation methods and the application of the low mole ratio UF resin adhesive and the high mole ratio MUF resin adhesive, the binding force of wood shavings in the core layers of the shaving boards is improved, the press speed is improved, and the production efficiency of the boards is improved.

Description

technical field [0001] The invention belongs to the technical field of wood-based panels and relates to the production of wood-based panel adhesives, in particular to the manufacturing methods and applications of low molar ratio UF resin adhesives and high molar ratio MUF resin adhesives. Background technique [0002] Particleboard is a board made of wood scraps (wood shavings, sawdust or similar materials) or non-wood plant scraps (flax, bagasse, wheat straw, straw or similar materials) and adhesives. "Particle board" and other titles are a kind of man-made board made by cutting wood and other raw materials into pieces of certain specifications, drying, mixing with adhesives, hardeners, and waterproofing agents, and pressing at a certain temperature. Because the particleboard structure is relatively uniform and the processing performance is good, it can be processed into large-format boards according to needs. It is a good raw material for making furniture of different spec...

AI Technical Summary

Problems solved by technology

In the prior art, due to the decline in the transfer strength of urea-formaldehyde resin with ultra-low free formaldehyde content, the amount of sizing on the board is lower than that of E 1 / E 0 It will increase significantly, which will significantly increase the cost of the plate; further, the production capacity of the production line will be severely reduced, and the production process will be difficult to control stably

The physical and mechanical properties of the board, such as the internal bonding strength, especially the formaldehyde emission of the board, are difficult to control stably

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