Flame retardant PVC product processing technology and applications
Polyvinyl chloride - PVC
I believe everyone must have heard of PVC, but it is not clear what it is. In fact, PVC is a kind of material that is widely used in life. Almost everyone has used things made of PVC. PVC is widely used in the field of flame retardant because of its own characteristics, then we will learn about the processing technology and application of flame retardant PVC products.
Simply put, PVC is polyvinyl chloride, a thermoplastic resin polymerized from vinyl chloride under the action of an initiator. It is one of the largest plastic products in the world, and it is inexpensive and widely used.
PVC products can be divided into two types: rigid PVC and soft PVC. Generally, the plasticizer content is less than 10%, which is called rigid PVC, and the plasticizer content is more than 30%, which is soft PVC. It should be noted that the rigid PVC itself has excellent flame retardant performance, LOI>45%, no special requirements do not need to add flame retardant; and soft PVC due to the presence of plasticizer, need to add flame retardant to achieve Flame retardant requirements.
Due to the wide range of applications of PVC products, in order to meet different needs, different PVC molding processes are required. Here is a brief introduction to the main molding process of PVC and the application of flame retardant PVC products.
1. PVC rolled products
After the PVC is mixed with the additive and plasticized, a film of a predetermined thickness is formed by using a three-roll or four-roll calender. Such flame retardant products mainly include electrical tape, light box cloth, toy film, conveyor belt, wallpaper and the like.
2. PVC coated products
The PVC coating is formed by hot-melting and stirring the plastic pellets into a paste, uniformly coating the base of the T/C knitted fabric according to the specified thickness, and then performing post-treatment. Such flame retardant products mainly include artificial leather, sofa and automobile leather, floor leather, outdoor tents, playground inflatable facilities, paving materials used as buildings, and the like.
3. PVC extrusion products
This process is mainly used for the processing of PVC wire and cable and PVC pipe.
4. PVC injection molding products
The products of this type of process mainly include pipe fittings, joints, junction boxes, foot pads, oxygen masks, toys, auto parts and the like.
5. PVC foam products
When soft PVC is mixed, a proper amount of foaming agent is added to make a PVC sheet, which is foamed into a foamed plastic, and can be made into a foaming board, a foam slipper, a sandal, an insole and a shockproof cushioning package.
6. PVC sheet, profile
Adding auxiliaries to PVC, after mixing, extruding hard tubes, shaped tubes and bellows of various calibers. The calendered sheets can also be superposed and hot pressed to form hard plates of various thicknesses, such as storage tanks, air ducts, doors and windows, and the like.