Hardener Additive

TPUA - AC528

DESCRIPITON

The almost colorless TPUA-AC528 is designed as curing agent for adhesive based on hydroxyl polyurethane, natural and synthetic rubber; owing to TPUA-AC528 has the feature of good photo-resistance, it is particularly suitable for light-color polyurethane, adhesive system .because the solvent is ethyl acetate , TPUA-AC528 can be used in those countries where the use of methylene chlorides is restricted.

 
TYPICAL PROPERTIES
Chemical composition ......................... Approx.25% aromatic polyisocyanate in 75% ethyl acetate.
Intrinsic color ......................... Almost colorless liquid
NCO content, %by weight ......................... 5.8±0.2.
Solubility ......................... Soluble in various esters, ketones and aromatic solvents
Storage stability ......................... Reacts readily with moisture; for best performance it should be kept dry and stored at temperatures betweens 5OC and 32OC

 
COMPATIBILITY WITH SOLVENTS
TPUA-AC528 can be diluted with anhydrous and alcohol-free ethyl acetate, dichloropropane, trichloroethylene, acetone, methyl ethyl ketone, toluene, and other similar solvents. The addition of relatively by using lager proportions of the solvents mentioned above.
APPLICATION

After the addition of TPUA-AC528, the ready-to-use double-component adhesive should be applied within a period (pot life) which is determined not only by its content of rubber, but also by the other ingredients of the formulation (e.g. resins, antioxidants, solvents, etc.) If the adhesive is not used within this period of time, it may become increasingly difficult to apply and its viscosity increases rapidly until irreversible gelling ultimately occurs.

 
SUGGESTED ADDITIONS
For Curing adhesive of 100 parts by weight (p.b.w) based on:

Graft - Choloroprene rubber
(Rubber content approx. 16%)		 ......................... 3-5 p.b.w. TPUA-AC528
Choloroprene rubber
(Rubber content approx. 20%)		 ......................... 5-7 p.b.w. TPUA-AC528
Hydroxyl polyurethane
(Rubber content approx. 15%)		 ......................... 3-5 p.b.w. TPUA-AC528
PACKAGE
A. each 0.8kg in a standard aluminum bottle
B. each 20 bottles in a standard carton
C. each 200kg in an iron drum

Notice: These values are based on the test of our present laboratory test specimens.