MELAMINE RESIN Chemische Eigenschaften,Einsatz,Produktion Methoden
Verwenden
Melamine formaldehyde is used for the treatment of heavy fabrics, draperies, coatings, collars, and apparel; in water- and oil-repellent and flame-retardant
hrllsIies (effective on synthetic and natural fibers).
Definition
A type of amino resin made
from melamine and formaldehyde. The first step
in resin formation is the production of trimethylol melamine, C3N3(NHCH2OH)3, the molecules
of which contain a ring with three carbon and
three nitrogen atoms, the –NHCH2OH groups being
attached to the carbon atoms. This molecule can
combine further with others of the same kind by
a condensation reaction. Excess formaldehyde or
melamine can also react with trimethylol melamine
or its polymers, providing many possibilities of
chain growth and cross-linking. The nature and
degree of polymerization depend upon pH, but heat
is always needed for curing. Melamine resins are
more waterand heat-resistant than urea resins.
They may be water-soluble syrups (low molecular weight) or insoluble powders (high molecular weight) dispersible in water. Widely used as
molding compounds with α-cellulose, wood flour,
or mineral powders as fillers and with coloring
materials; also for laminating, boil-proof adhesives,
increasing wet strength of paper, textile treatment,
leather processing, and for dinnerware and decorative plastic items. Butylated melamine resins are
formed by incorporating butyl or other alcohols during resin formation, whereupon the –NHCH2OH
groups convert to –NHCH2OC4H9. These resins are
soluble in paint and enamel solvents and in surface
coatings, often in combination with alkyds. They
give exceptional curing speed, hardness, wear resistance, and resistance to solvents, soaps, and foods.
Melamine-acrylic resins are water soluble and used
for formation of water-base industrial and automotive finishes.
synthetische
Melamine resin is a resin with melamine rings terminated with multiple hydroxyl groups derived from formaldehyde. This thermosetting plastic material is made from melamine and formaldehyde.
Vorbereitung Methode
The monomer used for preparing melamine formaldehyde is formed by reacting melamine with formaldehyde to yield hexamethylolmelamine. The monomer can further condense in the presence of an acid catalyst; ether linkages can also form. A wide variety of resins can be obtained by careful selection of pH, reaction temperature, reactant ratio, amino monomer, and extend of condensation. Liquid coating resins are prepared by reacting methanol or butanol with the initial methylolated products. These can be used to produce extreme surface hardness, discoloration and solvent-resistant coatings by heating with a variety of hydroxy, carboxyl, and amide functional polymers to produce a cross-linked film.
Industrielle Verwendung
This is a synthetic resin of the alkyd type madeby reacting melamine with formaldehyde. Theresin is thermosetting, colorless, odorless, andresistant to organic solvents. It is more resistantto alkalies and acids than urea resins, has betterheat and color stability, and is harder. Themelamine resins have the general uses of moldingplastics, and also are valued for dishes forhot foods or acid juices and they will not softenor warp when washed in hot water. Melamine,a trimer of cyanamide, has the composition(NC·NH
2)3.
The melamine resins have good adhesivenessbut are too hard for use alone in coatingsand varnishes. They are combined with alcoholmodifiedurea-formaldehyde resins to give coatingmaterials of good color, gloss, flexibility, andchemical resistance. Urea-modified melamineformaldehyderesins are used for coatings andvarnishes. Melamine-formaldehyde moldingresin, with cellulose filler, has a tensile strengthof 51 MPa and dielectric strength per mil of12.8×10
6V/m.
Melamine-urea-formaldehyde resin with alignin extender is used as an adhesive for waterresistantplywood. Phenol-modified melamineformaldehyderesin solution is used for laminatingfibrous materials. Highly translucentmelamine-formaldehyde resin is used for moldinghigh-gloss buttons. Methylol-melamine,made by alkylating a melamine-formaldehyderesin with methyl alcohol, is used for shrinkproofingwoolen fabrics.
MELAMINE RESIN Upstream-Materialien And Downstream Produkte
Upstream-Materialien
Downstream Produkte
