Urea-formaldehyde resin (UF resin)
Resin), a polymer obtained by the reaction of urea and formaldehyde. Also known as urea-formaldehyde resin. English abbreviation uf. Crosslinking occurs during processing and molding, and the product is insoluble thermosetting resin. Color ratio of cured urea-formaldehyde resin
Phenolic resin is shallow, translucent, resistant to weak acid and alkali, good insulation, excellent wear resistance and low price, but it is easy to decompose when it meets strong acid and alkali, and its weather resistance is poor. Trade name beetle urea and 37% formaldehyde water
Under the catalysis of acid or alkali, the solution can be condensed to obtain linear urea-formaldehyde oligomer. Alkali is used as catalyst in industry, and the reaction temperature is about 95℃. The molar ratio of formaldehyde to urea is 1.5 ~ 2.0 to ensure the curing of the resin. React first
Monohydroxymethyl and bishydroxymethyl urea are generated, and then hydroxymethyl and amino are further condensed to obtain soluble resin. If acid is used as catalyst, it will easily lead to gel. This product can only be stored under neutral conditions. Linear urea-formaldehyde resin takes ammonium chloride as solid.
It can be cured at room temperature. The molding powder is cured by heating at 130 ~ 160℃, and the curing process can be accelerated by accelerators such as zinc sulfate, trimethyl phosphate and diethyl oxalate. Urea-formaldehyde resin is mainly used to make molding compound.
It can be used to make daily necessities and electrical parts, and can also be used as board glue, paper and fabric slurry, veneer, building decorative board, etc. Because of its light color and easy coloring, products are often colored ... If it is mass production, use urea-formaldehyde resin. Urea-formaldehyde resin is the main adhesive in wood industry at home and abroad, which is widely used because of its advantages such as high bonding strength, fast curing, good operability, low production cost and abundant and easily available raw materials.
Urea-formaldehyde resin (UF resin)
Resin), a polymer obtained by the reaction of urea and formaldehyde. Also known as urea-formaldehyde resin. English abbreviation uf. Crosslinking occurs during processing and molding, and the product is insoluble thermosetting resin. Color ratio of cured urea-formaldehyde resin
Phenolic resin is shallow, translucent, resistant to weak acid and alkali, good insulation, excellent wear resistance and low price, but it is easy to decompose when it meets strong acid and alkali, and its weather resistance is poor. Trade name beetle urea and 37% formaldehyde water
Under the catalysis of acid or alkali, the solution can be condensed to obtain linear urea-formaldehyde oligomer. Alkali is used as catalyst in industry, and the reaction temperature is about 95℃. The molar ratio of formaldehyde to urea is 1.5 ~ 2.0 to ensure the curing of the resin. React first
Monohydroxymethyl and bishydroxymethyl urea are generated, and then hydroxymethyl and amino are further condensed to obtain soluble resin. If acid is used as catalyst, it will easily lead to gel. This product can only be stored under neutral conditions. Linear urea-formaldehyde resin takes ammonium chloride as solid.
It can be cured at room temperature. The molding powder is cured by heating at 130 ~ 160℃, and the curing process can be accelerated by accelerators such as zinc sulfate, trimethyl phosphate and diethyl oxalate. Urea-formaldehyde resin is mainly used to make molding compound.
It can be used to make daily necessities and electrical parts, and can also be used as board glue, paper and fabric slurry, veneer, building decorative board, etc. Because of its light color and easy coloring, products are often rich in color and magnificent.
Urea-formaldehyde resin has low cost, light color, high hardness, oil resistance, mildew resistance, good insulation and temperature resistance, but poor weather resistance and water resistance. It is one of the earliest thermosetting resins. 1924, a product developed by British melamine company, was sold on 1928. In the mid-1930s, the output reached1000t, and in the 1980s, the world output exceeded1.5 mt.
Urea-formaldehyde resin is the main adhesive in wood industry at home and abroad, which is widely used because of its advantages such as high bonding strength, fast curing, good operability, low production cost and abundant and easily available raw materials.
Is urea-formaldehyde resin adhesive toxic?
urea
Aldehyde resin adhesive is one of the most widely used bamboo and wood adhesives, which is formed by polycondensation of urea and formaldehyde. Its main varieties are: 53 1 UF resin adhesive, 563 UF resin adhesive and 500 1 UF resin adhesive.
Glue 53 1 urea-formaldehyde resin adhesive can be cured at room temperature or under heating conditions; 563 urea-formaldehyde resin adhesive was heated to 1 10 at room temperature for 8 hours. (aging for 5-7 minutes; 500 1 urea-formaldehyde resin
When using resin glue, it is necessary to add industrial chlorinated glue solution (concentration is 20%), which can be cured at room temperature or heated. Urea-formaldehyde inch fat adhesive has the characteristics of five colors, good light resistance, low toxicity and low price.
Widely used for bonding wood materials such as wood, bamboo and plywood.
Urea-formaldehyde resin is generally a water-soluble resin, which is easy to cure. The cured resin is non-toxic, colorless, good in light resistance, and does not change color after long-term use, nor does it change color during thermoforming. Various colorants can be added to prepare various brightly colored products.