Nitrile Rubber and Phenolic Resin Application

Read about Nitrile Rubber Resin:

• Nitrile Rubber Phenolic Adhseive
• Nitrile Rubber Phenolic Resin

Nitrile rubber/phenolic resin adhesive have been developed manily in the USA, where they have perhaps become more popular than in Europe. They have on average a rather lower tensile shear streangth than the polyvinyl acetal/phenolic resin adhesives, but somewhat higher strength especially at sub zero temperature.

Read More..

Nitrile Rubber and Phenolic Resin

With nitrile rubbers, the phenolic resin component is more critical and compatibility more of a problem than with the polyvinyl acetal. Since resins having a high pH value tend to less compatible, ammonia and hexamethylene tetramine are preferred to sodium hydroxide as curing catalysts.

Although a wide range of nitrile rubbers, having different but related molecular system is a copolymer of butadiene and acrylonitrile, and is refered to simply as nitrile rubber or more particularly as high nitrile rubber. In spite of this name the monomer ratio is such that butadiene is in excess of acrilonitrile and comprises 60 - 70% of the weight of the copolymer.

Read More..

Nitrile Rubber/Phenolic Resin Adhesives

It will be clear that rubbers and phenol formaldehyde resin differ in most respect. And because they widely, a variety of properties can be obtained by blending them, adhesives, for example, can be made with certain desirable features in which individually the resin and rubber are deficient. Briefly, the resin reduces extensibility of the rubber whilst increasing its cohesive strength.

The first reference to the use of a combined resin and rubber adhesive was probably the patent that granted over thirty years ago describing bonding to metal, porcelain and glass with a rubber or rubberlike substance mized with a synthetic resin. Since the publication of this patent many rubber and rubberlike substances have no doubt been examined as adhesives in association with a thermosetting resin, especially a phenolic resin. Experience has shown that the most important rubber is nitrile rubber, and its behavior in a two polymer adhesive is in a number of ways rather like that of the polyvinyl acetals discussed previously, some of the comments made in the previous section therefore apply here.

Read More..