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Copolymerized resin of melamine phenol and formaldehyde and its production method
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A technology of formaldehyde copolymer resin and melamine phenol, applied in the field of resin glue, can solve problems such as insufficient chemical structure, influence on production efficiency and cost, complicated process and the like
Inactive Publication Date: 2006-11-22
ZHEJIANG FORESTRY UNIVERSITY
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Problems solved by technology
Among them, melamine participates in the synthesis of modifiers, and does not directly copolymerize with phenols and aldehydes. The internal chemical structure of the glue is not stable enough, and its performance is not stable, so the storage stability will also be affected.
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Embodiment 1
[0007] Embodiment 1 (referring to serial number and the proportioning figure of parts by weight in the table):
[0008] First melt 40 parts of phenol (hereinafter represented by P) in the reactor, add formaldehyde
[0009]
[0010] (hereinafter represented by F) 60 parts, use NaOH solution to adjust PH=7.5-9.5, stir evenly, heat up to 40-60°C, add 30 parts of melamine (hereinafter represented by M), stir evenly, then measure and adjust PH=7.5 -9.5, continue to evenly heat up to 85-95°C, keep warm for 60-90 minutes, measure the water-soluble ratio at 25°C water temperature is 0.5-2.0, cool to 45°C, stop the reaction and discharge.
Embodiment 2
[0012] Melt 25 parts of P in the reaction kettle, add 12 parts of F and 5 parts of M, add 5 parts of water when F is added, or when M is added, or when the pH value is adjusted, and this rubber is obtained by the same method as in Example 1 .
Embodiment 5
[0014] Melt 30 parts of P in the reactor, add F 1 (Indicating adding for the first time) 40 parts, adjust PH=7.5-9.5 with ammonia water or KOH, stir evenly, heat up to 40-60°C, add 20 parts of M, add 10 parts of water at the same time, stir evenly, retest and adjust PH=7.5- 9.5, continue to evenly heat up to 80-95°C, keep warm for 40-60 minutes, add F when the water-soluble ratio is about 2.0 in 25°C warm water 2 (Indicates the second addition) 30 parts, continue to keep warm for 0.5-1 hour on the basis of 80-95 ° C, and then measure the water-soluble ratio of 0.5-1.5, cool to 45 ° C to terminate the reaction and discharge.
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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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