Foam adhesive is a special polyurethane product which is filled with polyurethane prepolymer, foaming agent, catalyst and other components in a pressure-resistant aerosol tank. When the material is ejected from the aerosol tank, the cured silica gel foam has a variety of effects such as seam filling, bonding, sealing, heat insulation and sound absorption.

Introduction to the characteristics of foaming glue

Styrofoam has stable chemical properties, long service life and no pollution to the surrounding environment. From the open fire from the extinguish, and burning only carbonization does not drip, carbonization layer size and shape is basically unchanged, can effectively cut off the air into, prevent the spread of fire, fire safety performance is good. The thermal insulation performance is excellent, is currently all domestic building materials in the thermal conductivity of the lowest (≤0.024), thermal resistance of the highest thermal insulation material, thermal conductivity is only half of EPS foam polystyrene board. Styrofoam has a continuous and dense skin and close to 100% high-strength interlinked wall obturator, with ideal impermeability.

The method of purchasing and identifying styrofoam

1. Judge from the color after glue. Good styrofoam comes out milky white (not white). Black gray or extra yellow is not a good color (indicating that the finished product is made from cheaper and lower quality raw materials in order to reduce costs).

2, judging from the foam state of the glue. The foam can not be too thin or too thick, too thin foam will collapse, too thick foam will be dry and easy to shrink, good foam surface gully, smooth but not very bright; Poor foam has a flat surface and wrinkles.

3, judging from the colloid solidification state. After foaming glue curing, cut the foam, see the bubble hole, the bubble hole uniform fine is good foam, such as the bubble hole is very large, indicating that the density is not good, because only after high density, foaming glue waterproof, sound insulation, elastic hardness and other properties are guaranteed.

4, judging from the size of the colloidal foam. Good foam is full and round; Poor foam foam is small, and collapse (part of the poor foam in production in order to reduce the cost and performance in the market has the advantage in the formula adjustment to do the foaming amount is very large, resulting in a certain cost, can only reduce the density, large bubble, small elasticity, hardness is not high.

5. Judge from the state of the cured glue block. Squeeze the foam block by hand, good foam has good dimensional stability. Fully cured after elasticity, too soft and hard are not good, part of the poor glue inelasticity, after curing with finger press can not recover or recover smaller.

6, judging from the colloid adhesion. Good foam adhesion is strong, poor adhesion is poor (poor bonding strength will cause the building surface and aluminum alloy or door cover bonding is not firm or even hang).