Thermal stabilizer Type Manufacturer Organic calcium complex KGF-[R.sub.6]H Hangzhou Sanye Additive Co., 1 (OCC1) Ltd, China Organic calcium complex KGF-[R.sub.6]J Hangzhou Sanye Additive Co., 2 (OCC2) Ltd, China
Mercaptide organolin 1 ZT-237 Beijing Zhenghen Chemical (MOT1) Co., Ltd, China
Mercaptide organotin 2 TM-181-FS Rohm and Haas Co., America (MOT2) Sample Preparation
Name Type l 2 3 4 5 6 PVC resin TK 1000 100 100 100 100 100 100 Organic calcium KGF-[R.sub.6]H 2 complex Organic calcium KGF-[R.sub.6]J 2 complex Dibutvltin dilaurate Analytically pure 2 Mercaptan organotin ZT-237 2 compound Methyltin
mercaptide TM-181-FS 2 Artificial Ultraviolet-Weathering
* Thermolite 179 butyltin
mercaptide heat stabilizer can be used for high-output extrusion of rigid PVC for applications requiring good stabilization, weathering, and color hold in substrate and topcoat formulations, eliminating the need for a second stabilizer.
The dependence of clusters size distribution on the experimental conditions (i.e., amount of
mercaptide precursor and annealing time) was studied for the polystyrene/silver system.
Except where noted, PVC was always stabilized with 1 wt% of the tin
mercaptide, dibutyltin bis(2-ethylhexyl mercaptoacetate) (T31), obtained from Elf Atochem.
The following are new products from Witco for rigid vinyl applications: TS-744 lubricating high-efficiency butyltin
mercaptide stabilizer, when used with Marklube L-135 solid lubricant, reportedly offers excellent heat stability and processability for high-output profile extrusions for the window and door market.
The stabilization package developed included a methyl tin
mercaptide thermal stabilizer and lubricants such as epoxidized soybean oil and hydrogenated castor oil.
The first, a general-purpose butyl Sn
mercaptide with 17% Sn content, provides good clarity and initial color It is typically used for technical grade extrusion and injection molding applications.
PVC resin and additives such as DOP and tin
mercaptide were used as received.
Advastab TM-161 is a high-efficiency liquid methyltin
mercaptide designed for extrusion and injection molding of CPVC and also demanding PVC applications where prolonged and severe processing temperatures are required.
One hundred parts of PVC (Kanevinyl S-400 P = 400) was blended with 3.0 parts of octyltin
mercaptide, 1.0 part of stearyl alcohol, 0.5 part of stearic acid amide, 0.5 part of montanic acid dial ester and 1.0 part of a processing aid (Kane Ace PA2O), and the resulting blend was extrusion molded using a 50-mmdiameter single-screw extruder (VS50-26) manufactured by Tanabe Plastic Kikal Co., Ltd.