Description

Technical Parameters

Chemical formula: C15H30N6O6

CAS number: 3089-11-0

EC number: 221-422-3

Chinese aliases include rubber adhesive HMMM, melamine resin; English alias: hexamethoxymethylmelamine The compound has a molecular weight of 390.44 g/mol, a density of 1.219 g/cm³, a boiling point of 487°C (760 mmHg), a flash point of 248.3°C, and a vapor pressure of 1.23E-09 mmHg at 25°C.

Property

Adhesive RA is composed of hexamethoxymethylmelamine and an inert carrier. In conjunction with methylene receptor, it can effectively promote the adhesion between rubber and steel reinforcing material.

Specification

Item	Index
Appearance	white powder
Ash content(850℃), %	29～35
Moisture content(boiling evaporation method), %	≤4.5
Sieve residue(325 mesh wet-method),%	≤0.3
Free formaldehyde, %	≤0.1

Application

Adhesive RA (HMMM) leads to the adhesion action via reaction with the methylene receptor, such as RS, adhesive RE etc. This reaction will quickly start at the vulcanization temperature. If the reaction occurs before vulcanization, the adhesion action of matching system will significantly, decrease, even disappear. Generally, rubber filler and methylene receptor are added and mixed at first at a higher temperature, then adhesive RA, sulfur and accelerator are added simultaneously at final mixing stage.

2～5 phr of adhesive RA (HMMM) is suggested to be used in 100 phr rubber compound with other methykne receptor.
As a multifunctional crosslinking agent, it can undergo esterification with the carboxyl groups of waterborne polyurethane to form a network crosslinked structure. When added at 8%, the tensile strength of the polyurethane film reaches 14.6 MPa, an increase of 125%; a 10% addition increases the initial decomposition temperature of the film by 20℃, and the 20% mass loss temperature reaches 329℃. It is mainly used in coatings, adhesives, and fabric treatment agents. Its synthesis is achieved through the methyl etherification reaction of hexamethylol melamine with methanol catalyzed by nitric acid.