Abstract: This paper briefly introduces and compares the materials of the mould adhesive, and introduces

the development and the simple application of a two - component casting polyurethane mould adhesive.

Key words: mould, rubber, polyurethane, silicone rubber, two components

Polyurethane material is a kind of polymer material which has developed in recent years. Because of its

wide variety of raw materials, formulation and processing methods are varied, adjustable range of great,

the performance between the plastic to rubber materials from the entire range of 3, so it is one of the

fastest development of materials in recent years.

With polyurethane material is also divided into two components, can be painted or cast, can also be sprayed

according to the construction needs. Die hardness adjustment is convenient, from shore A15 degrees to shore

D85 degrees. The viscosity of the material is low, without pre deaeration treatment, easy to use, the price is

lower than the silicon rubber material. The disadvantage is that the adhesion of polyurethane material is very

good, the mold must be pre coated good mold release agent, will not cause the casting of the product adhesion

mold. Also as a result of polyurethane materials are sensitive to moisture, so when in use to avoid the effect

of moisture in the air on the polyurethane material, otherwise the product in the curing process will react with

moisture to form bubbles of gas.