PVC profile with aheat stabilizer system analysis

PVC profile stabilizer Lead salt stabilizer system
Lead salt stabilizer is used in the production of plastic doors and windows up stabilizer,

with a stable and good effect, however, because of the toxicity of lead, although not

directly in contact with the human body, still pose a threat to the environment and human

health. PVC acid and alkali corrosion,

Hard PVC plasticizer-free mold can not easily be decomposed, but the lead salts and sulfide

in the air will generate lead sulfide, lead salt stabilizer using PVC profile windows and

doors using 1 ~ 2 a tarnished changed later on yellow, 3 ~ 4 a rear surface chalking some.
In addition, the use of lead salt stabilizer for PVC plastic doors and windows, lead salt

stabilizer and other sulfur-containing components of the formulation, such as fillers,

colorants color caused by the phenomenon will have a reaction, in the development of

formulations should be noted. In the recycling process, lead stabilizers polyvinyl chloride

Ene, if added to the thiol-containing tin stabilizers or waste material back also occur

disadvantages.
Organotin stabilizer system
Organotin PVC processing is the main heat stabilizer is one of the best performance of

varieties, the global application of more than 60 years of history, the basic organic tin

as an alternative to lead stabilizers. Use of organic tin stabilizer system PVC products is

to obtain FDA approval

You can contact with food, but the current market some methy l tin mercaptide organotin

stabilizers "top three" content is too high; also there, at the site where such protection

is not well ventilated, which occurred in organic tin poisoning events have occurred.

Methyl tin mercaptide

Toxicity of the finished product depends mainly on the "top three" levels. When the "top

three" content of 0.3%, which is close to the toxicity of butyl mercaptan tin toxicity

(LD50 of 1037 mg / kg). "Top three" soluble in water, vapor pressure of 1.533 Pa, will be

able to evaporate at room temperature

, And the evaporation rate than the "dimethyl", "tetra" are faster. At room temperature, it

may pass through the respiratory tract, gastrointestinal tract, and skin and mucous

membranes into the body and is first absorbed into the blood, thus, prone to damage. From

thi s perspective, the development of methyl mercaptan tin on

The product must be in the "top three" content control.
Because PVC products are renewable and recyclable, PVC waste from various sources in

varying methyl mercaptan containing tin or recycled should also pay attention to

protection, PVC waste recycling also has examples of organic tin poisoning, can not be

taken lightly.
Ca-Zn stabilizer system
At home and abroad are now focusing on the development and application of non-toxic

stabilizers, calcium, zinc composite heat stabilizer is one of the most promising

varieties. Commonly used non-toxic calcium zinc heat stabilizers, cheap, good lubrication,

and it sounds lead salt in the recipe formulation system, lubrication mechanism and

processing

Workmanship is very similar to an alternate conversion lead salts easier, but its poor

t hermal stability, and zinc soap often caused by products "zinc burning" in the product

performance demanding applications, the use of zinc soap has been limited.
Compound stabilizer is divided into solid and liquid are two products in the processing of

non-toxic PVC, PVC release of HCl and the reaction of zinc chloride compound is PVC-based

polymerization catalyst, the real material degradation, and the role of calcium carboxylate

Zinc is that once formed polymeric network

Thereof, which can neutralize HCl and inhibit the polymerization of zinc into the zinc

chloride complex, so that the stability of the polymer obtained, is a non-toxic, highly

efficient heat stabilizers PVC processing.
Composite stabilizer system
Different activity of the metal, the formation of stable metal soaps different ability of

PVC, composite stabilizer in addition, it also appears stabilizer compound of new

varieties. If the activity is high in zinc or tin soap soap and use, as well as barium,

cadmium, zinc soaps composite, synergy attainable

Have a good stabilizing effect.  PVC heat stabilizer for window