Technology Advisory_第5页_Novista Chemicals - The pioneer of Flame retardant

18 2022-2
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…
18 2022-2
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…
18 2022-2
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…
12 2022-2
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…
12 2022-2
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…
12 2022-2
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…
23 2021-11
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…
23 2021-11
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…
23 2021-11
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…
11 2021-11
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, …
11 2021-11
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…
11 2021-11
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…
4 2021-11
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…
4 2021-11
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 …
4 2021-11
Impact of PVC Ingredients on Heat Stabilizers Selection The best approach in most cases is to check heat stability and color retention of the formulation with and without these additives. It helps to pre-determine the extent of any potential problem.Vinyl ingredients which can have a potential impact on PVC heat stability are discussed below:Vinyl ResinsThe wide variety of PVC resins is probably the single greatest factor which expla…
10 2021-9
HOW IS PVC USED Example of PVC Pipe UseFirst implemented in the 1920s, PVC is now heavily used within water delivery pipes, venting and duckwork for structures, appliances and equipment, plumbing conveyance of sewage and wastes, chemical fluid transfer, in construction engineering as well as an array of individual, unique items and consumer products. When used in applications, PVC is considered…
10 2021-9
PVC CHARACTERISTICS AND PROPERTIES PVC as a material is fairly durable, flexible, and resistant to many harsh working conditions that can involve chemicals, soil, water, wastewater and water pressure. As a plastic, PVC is naturally resistant to corroding, rusting and the effects of weathering, excluding PVC’s long term sensitivity to continuous ultraviolet (UV) sun exposure. Within chemical handling and processi…
10 2021-9
WHAT IS PVC | WHAT IS UPVC? PVC is the three-letter acronym used to describe polyvinyl chloride, a synthetic plastic and highly versatile material. PVC is widely used within modern society and sector applications as pipe for transporting fluids from water to chemicals to ingredients. uPVC stands for unplasticized polyvinyl chloride and is PVC without plasticizing (flexibility) agents added. PVC and uPVC is…
26 2021-8
The Function of PVC Stabilizers Without the addition of a stabilizer, PVC resins begin to degrade at temperatures of 160°C or more, the main re-action being dehydrochlorination.The results of measurement of the chlorine in the hydrogen chloride gas produced by the degradation of PVC during heating shows, as can be seen, the addition to the resin of a lead stabilizer reduces the amount of hydrogen chloride prod…
12 2019-12
Typical automotive parts made from PP Plastic parts are widely used in vehicle prodcution nowadays. PP, as a main plastic type, is the raw material for many automotive palstic parts. PP is combustile by nature. But people have high demand for the car's fire-resistance performance. So automotive PP needs flame retardants added, such as instrumental panel, door panel, cowl top, etc.