Copolymerized resin of melamine phenol and formaldehyde and its production method

Abstract

The invention discloses a manufacturing method of energy-saving modified phenol resin glue, which comprises the following parts: 25-50 percent phenol, 5-50 percent melamine, 12-252 percent formaldehyde, 0-85 percent water. The making method comprises the following steps: fusing the phenol into liquid in the autoclave; adding formaldehyde; putting alkali to adjust pH value at 7.5-9.5; heating to 40-60 deg.c; adding melamine; stirring evenly; adjusting pH value at 7.5-9.5 again; heating to 80-95 deg.c; keeping temperature to react for 40-90 min; detecting through water times; cooling to 45 deg.c; discharging. The appearance of glue displays yellow transparent glue liquid, whose storing time is more than two months with 7.5-9.5 pH value, 3-10 percent free phenol and 40-75 percent solid content.

Description

technical field

[0001] The invention relates to a resin glue prepared by copolymerization reaction using melamine, phenol and formaldehyde as raw materials and a preparation method thereof. Background technique

[0002] Phenolic resin glue made of phenolic organic substances such as phenol and aldehyde organic substances such as formaldehyde is an important synthetic thermosetting resin glue, which is widely used in film plastics, adhesives, coatings, etc., and it is used as wood adhesives. Its performance and price advantage is particularly prominent. However, the color of phenolic resin is darker, and the bonding strength and flame retardancy still need to be further improved to meet the needs of some new processes and new application fields. For this reason, those who are interested have explored from modification. For example, in the sixth issue of volume 17 of "Wood Industry" published in November 2003, Mr. Shi Junyou published the article "Research on Melamine Urea F...

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