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Welcome to the website of Novista Chemicals Co.,Ltd. Email：info@novistagroup.com
Functions and Dosage of various PVC Lubricants-3 It is desirable to know how important lubricants are, but it is critical to know how much to useUnder lubrication or over lubrication affect the processing as well as product quality. Under lubrication will result in frictional heat and degradation of PVC or poor fusion with loss of mechanical properties. Over lubrication is a problem that results in scorching, low output, surg…
Functions and Dosage of various PVC Lubricants-2 3. Fischer Tropsch WaxFischer Tropsch synthetic wax has a linear structure which gives high-temperature resistance, lower viscosity and softening points between 65-105°C. It increases the fusion time and stability of PVC while decreasing the fusion torque required for the processing of PVC. Its linear structure provides an excellent metal release effect and reducing the form…
Functions and Dosage of various PVC Lubricants-1 Lubricant is one of the most essential additives after heat stabilizer yet most difficult to adjust for the processing of rigid PVC. PVC requires various additives to prevent PVC from degrading when heated and sheared and get the desired and perfect articles. Lubricant reduces various types of frictions within the polymer matrix and between the polymer matrix and processing equi…
Heat Stabilizers for PVC: A complete guide-3 Lead-based StabilizersLead-based stabilizers offer the best electrical properties. This is stated by and large by the fact of the insolubility property of lead chlorides formed during stabilization. The Lead-based One Pack Stabilizers have a proportionate combination of Lead Stearate, Dibasic Lead Stearate, and Lubricants that give synergistic effects. The diligently manufacture…
Heat Stabilizers for PVC: A complete guide-2 What are Heat Stabilizers?Heat stabilizers are additives that are intended to shield polymers from the degrading effects of heat at the time of processing or use. Role of Heat Stabilizer in PVC processingPolyvinyl chloride or PVC has a maximum operating temperature of around 60°C (140°F). At this temperature, the heat distortion of PVC begins. As PVC starts getting heated up to …
Heat Stabilizers for PVC: A complete guide-1 Polyvinyl Chloride a.k.a. PVC, a long chain of vinyl chloride, finds numerous applications in commercial, industrial, and medical products. Before exploring the world of heat stabilizers used for PVC, let's start with the basics of this resourceful polymer. What is PVC?Polyvinyl chloride or PVC is the world's third-most widely produced synthetic plastic polymer; the first two be…
What happens in Foamed Polyvinyl Chloride?-3 Although, it is an internal lubricant only that promotes plasticization, improves polymer fluidity and the surface finish of products. External lubricant like PE wax is used to reduce the friction between the polymer and the surface of the machine to prevent it from adhering to the mechanical surface. High melt OPE waxes, provide good lubrication in middle and late processing. L…
What happens in Foamed Polyvinyl Chloride?-2 Organotin stabilizers are usually used for rigid foam boards. The majority of tin stabilizers used are tin mercaptides. They are cheaper than tin carboxylates and give excellent heat stability but poor weatherability. Also, they don’t act as kickers for ADC decomposition. Hence, formulations based on tin mercaptide, which are used for the majority of non-weathering foam sheet p…
What happens in Foamed Polyvinyl Chloride?-1 Foamed or Microcellular Polyvinyl Chloride (M-PVC) is formed by a process called nucleation. Homogenous microcellular foams, with an average cell size of the order of 10 microns, can be produced in PVC by the process of nucleation. In this process, gas is dissolved under high pressure into the liquefied U-PVC as it's undergoing the extrusion process. This causes the uniform crea…
Replacement of lead based stabilizers with lead free stabilizers-3 Until 2016, 80% of the world’s manufacturers were using lead stabilizers, the remaining 20% are used to stabilize PVC food packing, mineral water bottles and pharmaceutical containers. Despite many advantages, the toxicity of lead has brought a restriction to the use of lead based stabilizers in PVC articles. This restriction brought a revolutionary change in PVC processing. In…
Replacement of lead based stabilizers with lead free stabilizers-2 Besides Ca-Zn stabilizers, Organotin mercaptide based stabilizers are another choice. These are generally available in liquid form, but nowadays powder form is also available with some manufacturers. Organotin stabilizers are very popular for transparent applications and rigid applications in America. They offer outstanding color retention in plasticized and rigid PVC processing…
Replacement of lead based stabilizers with lead free stabilizers-1 Nathaniel Branden, a famous Canadian-American psychologist once said, “The first step toward change is awareness. The second step is acceptance.”Lead based stabilizers are being used from the very beginning to stabilize rigid PVC across the world. The decomposition temperature of PVC is much lower than its processing temperature. Thus, the processing of PVC requires heat stabi…
The brief introducton of plastic extrusion process In the plastics extrusion process, raw thermoplastic material, or resin, is gravity fed from a top mounted hopper into the barrel of an extruder. Additives, such as colorants and UV inhibitors, in either liquid or pellet form are often used and can be introduced into the resin below arriving at the hopper. The process has much in common with plastics injection molding though dif…
PVC Profile Extrusion Process Profile extrusion is the process of making continuous shapes of plastic (not including sheet and film) by extrusion. Molten polymer is forced through a metal die cut into the linear shape of the desired finished article (channel, tube, etc.). The molten polymer exits the die and is drawn to the appropriate thickness in air. The article is then cooled and shaped by a forming/sizi…
Plastic Profile Extrusion Profile extrusion is a process by which various plastic materials are used to develop quality plastic products. These products have a continuous cross-section such as pipe, drinking straws, decorative molding, eavestroughing, window trimming and many others. The basic procedure of profile extrusion is that the polymer is melted into a hollow mold cavity, under the influence of h…
Replacement of lead based stabilizers with lead free stabilizers-3 The other very new and emerging category of heat stabilizers is organic stabilizers. They are being developed as effective, safer and more eco-friendly additives for PVC processing. The major component acting as primary stabilizer and lubricant is Calcium Stearate. Other than calcium stearate organic stabilizers are based on various organic compounds like alkyl/aryl phosphites, …
Replacement of lead based stabilizers with lead free stabilizers-2 Besides Ca-Zn stabilizers, organotin mercaptide based stabilizers are another choice. These are generally available in liquid form, but nowadays powder form is also available with some manufacturers. organotin stabilizers are very popular for transparent applications and rigid applications in America. They offer outstanding color retention in plasticized and rigid PVC processing…
Replacement of lead based stabilizers with lead free stabilizers-1 Lead based stabilizers are being used from the very beginning to stabilize rigid PVC across the world. The decomposition temperature of PVC is much lower than its processing temperature. Thus, the processing of PVC requires heat stabilizers that do not allow HCl molecules to leave the polymer chain and increases the decomposition temperature.Lead based heat stabilizers provide e…
Role of PVC Heat Stabilizers Poly(vinyl chloride (PVC) is one of the most important commercial plastic and its compounds have a great diversity of applications and methods of processing. But, PVC is thermally unstable at processing temperatures.The amount and type of energy input varies considerably among the many different production methods and end-use applications of PVC. In fact, resin degradation start…
Types of Heat Stabilizers for Vinyl Compounds There are several basic groups of heat and light stabilizers currently offered to the vinyl industry which include:Mixed MetalsOrganic acid salts (liquid and solid), consisting of any one or a combination of barium, calcium, cadmium (disappearing), and zinc. Typically, C8 to C18 straight chain or branched chain aliphatic carboxylic acids are used. Aromatic (alkyl benzoic) acids …
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