Amines are low viscous liquids with an unpleasant choky smell. They are harmful when inhaled and corrosive as well.
It has been noticed that though amine primarily helps gas formation reaction, it promotes just to an extent, the gelling reaction. In most cases, combination of various amines, results in a balance of both gelling and blowing reactions which also promotes easy process control.
In the manufacture of polyurethane foam, the gelation reaction between the polyol and isocyanate is catalyzed through the use of organometallic catalysts (primarily Tin compounds). For flexible slab-stock foam, Stannous Octoate is the preferred catalyst. By varying the concentration of Stannous Octoate in the formulation, a balance can be achieved between the gelation and the blowing reaction.
Stannous Octoate is the standard gelling catalyst for use in the manufacture of flexible slabstock foam. It can also be used as a catalyst for molded polyurethane foams, polyurethane coatings and sealants.
Of the many grades of Organo - Metallic compounds in use as catalysts, tin compounds are the most widely used with Stannous Octoate being the most popular. If the stannous content drops below 91%, it becomes valueless as a catalyst. For this reason, it is usually stabilized with anti oxidants. The exposure of stannous Octoate to atmospheric oxygen is disadvantageous and should be discouraged since the compound is easily hydrolyzed and oxidized. Similarly, because Stannous Octoate is also readily hydrolyzed in the presence of strong bases like tertiary amines and water, they are not blended with water or amine containing compounds. Generally, stannous Octoate is referred to as a cross linking agent because of its influence on the cohesion and hardness of a foam.
Gulbrandsen’s T-Cat-110 Stannous Octoate is manufactured under ISO 9001 quality control standards, resulting in a product with uniform tin levels, consistent performance and no undesirable color or odor being imparted to the foam. While packaged under a nitrogen atmosphere, stabilizers are also added to minimize oxidation that may occur due to accidental exposure to air, ensuring that the product will perform reliably. Gulbrandsen can also provide Stannous Octoate in dilute mixtures to various ratios with Diisononyl Phthalate (DINP), Dioctyl Phthalate (DOP), Mineral Oil, and Natural Polyol.
ITS PROPERTIES ARE:
Results are for pure T-Cat-110 Stannous Octoate
Gardner Color = 7 Max
Specific Gravity = 1.22 – 1.28
Refractive Index = 1.481 – 1.499
% Stannous Tin = 28.0% Min
Viscosity @ 25°C = 500 cps MAX
PACKAGING:
7 Gallon Plastic Carboy: Up to 70lb/31.8kg
20L Plastic Carboys: Up to 55.1lb/25kg
55 Gallon Steel Drum: 570lb/260kg
Polyethylene steel-reinforced tote bins: 2,750lb/1,247kg
Weights shown are for pure Stannous Octoate. Load weights will vary for diluted Stannous Octoate blends.
0 comments:
Post a Comment