Comparative advantage with other kinds of stabilizer:calcium zinc series is the primary research object of stabilizer,this kind of stabilizer price is low,but the heat stubborn achievement is poor,so its use price can not compete with lead salt stabilizer.The development trend of inorganic tin stabilizers is to use inorganic SN(monomethyl,monbutylor monoctyltin)with smaller alkyl number in the formulation,supplemented by mercaptan or inorganic S with lower molecular weight and stronger function.These applications can also be better met by taking mercaptan inclusion trivialization.Rare earth stabilizers and new inorganic stabilizers have been the main research direction in recent years.Medium and diketone compounds are metal-free stabilizers with rapid development in the current biosphere scale,and have also gained considerable popularity in the factory.Most products are complexes of inorganic compounds with secondary stabilizers such as metals that work together as rigors.Calcium zinc stabilizer surface is mainly Snow White powder,flake,paste.Powdery is used as a more widely used pvc stabilizer,often used in food packaging,medical equipment,wire and cable materials.At present,the industry has presented pvc calcium zinc stabilizer which can be used for hard pipe.Conservative environmental protection products such as calcium/zinc stabilizer,in the plasticization process,due to the electronegativity is larger than lead,sexual groups and pvc resin sexual nodes have a certain affinity and force,the formation of a strong bond energy complex,thereby weakening or removing the pvc particles between the layer of the discharge force,the pvc around each other entangled chain segments easy to diffuse,the coastal between molecular groups easy to disappear,Promote plasticization of pvc resin.This causes melt pressure to increase rapidly,melt viscosity to fall and temperature to rise after the dry mixture is plasticized locally in the charging section.Plasticizing temperature depression,inducing dry mix fire plasticizing,and because the antique pvc processing equipment is for the use of lead salt stabilizer processing management,that is,is equal to the withdrawal of sufficient amount of lubricant(excluding a part of the smooth agent,due to the impact of price factors,Production enterprises generally adopt paraffin,stearic acid and other low melting point of cheap smoothing agent)but also in enough time to prevent further plastination of resin,but also broken the original greasy balance,so that the later pvc melt in the homogenizing section of the cost of a small amount of heat stabilizer at the same time,and can not meet the ambition of viscosity and elasticity,to meet the hard pvc production needs.This is the title problem of calcium zinc stabilizer in the inclusion of lead salt.
Usually divided into:solid calcium zinc stabilizer and liquid calcium zinc stabilizer.Calcium zinc stabilizer is synthesized from calcium salt,zinc salt,lubricant,antioxidant and other primary components by adopting uncommon compound composition.It not only approximately replaces toxic stabilizers such as Pb and CD salts and organotin,but also has the same good thermal adherence,photoinvariance,clarity and coloring power.Practice has proved that in pvc resin finished products,the processing property is good,the thermal strength sensation leads to the stabilizer of lead salt,is a good stabilizer.The price of powdery calcium zinc stabilizer is irregular,and there is no standard national scale to regulate it.Liquid calcium zinc stabilizer:liquid calcium zinc stabilizer skin phase is mainly light yellow oily liquid.Liquid calcium zinc stabilizer,powder and liquid hardness difference is little,liquid calcium zinc stabilizer usually has a large degree of melting,not to say in pvc tree powder has good dispersion,the influence on chroma is far less than powder stabilizer.The two systems of calcium and zinc stabilizers are mainly divided into hydrotalc trivializing and zeolite systems.As a kind of pvc heat stabilizer in our country,rare earth heat stabilizer shows excellent thermal toughness,good weather resistance,excellent processability,storage strong and hard and so on.Especially because of its environmental protection,rare earth thermal stabilizer is one of the few kinds of thermal stabilizer that can meet the environmental protection application.At the same time,our rare earth resources are particularly rich,with abundant data sources and low material cost,scattered processing technology is naive.Therefore,deep research and development of rare earth heat stabilizer,completely replace toxic heavy metal heat stabilizer and some organotin heat stabilizer with cheap price will be the main bias in the future development of our stabilizer industry.
