What are the five types of polymer additives

 About  additive 

an additive developed by polymers to improve the processing properties of polymers. Applications include film, blow molding, extrusion, monofilament, fiber, pipe, wood plastic, sheet and wire, and cable. It has the following effects :1, Like the usual melt rupture, Improve the brightness and smoothness of the product surface. Make the color more uniform, Shinier. Reduce the wear and tear of the mold during processing, Eliminate the phenomenon of die accumulation. Reduce the gel produced during extrusion. Reduce processing temperature and extend continuous processing time. 6. Improving the molding rate and dimensional stability of the product, Reduce waste rate. Applicable material (M) LLDPE, LDPE, HDPE, PE-RT, PVC, PA, PS, ABS, PP, BOPP, CPP and other materials working principle when the addition of polymer processing aids in the extrusion process, Under the influence of potential difference, The tendency of fluorinated polymers to move to the outer layer of the melt and attach to the metal surface, Form a lubricating layer between the metal wall and the polymer melt (which takes 1-3 hours to form, depending on the machine size). During continuous extrusion, This coating is in dynamic equilibrium, When the dynamic equilibrium is stable, the Extrusion process and product quality will be stable. The typical addition range PPA addition amount is PPM,300-1200 The influence of other additives and processing technology in basic resin should be considered.

Plastic and Polymer Additives

Plastic has the advantages of a lightweight, corrosion resistance, high strength, excellent electrical properties, and easy processing. All kinds of beautiful and colorful products made from it have become an essential material for people to dress, eat, live and walk. However, plastics are not perfect, such as some plastics are too brittle, some flammable, some easy to start static electricity and so on, so a variety of additives (also known as auxiliaries) must be added to improve the properties of plastics.

With the rise of the plastic industry, as an indispensable additive for plastic processing, it must develop synchronously, and has become a fine chemical industry with a wide variety and considerable scale. Now the annual consumption of plastic additives is about 11% of the consumption of plastic. There are many varieties of plastic additives, and several of the main types are described below.

The antioxidant is a chemical additive that can inhibit or delay the automatic oxidation reaction. Plastic in the process of processing, storage, and use, under the action of light, heat, and oxygen, will fade (yellowish), weight loss, become opaque, powder and surface cracking, this phenomenon is called aging phenomenon. With the aging of plastics, products will lose their use-value.

80% of the total amount of antioxidants is used in three kinds of polymers: polypropylene, polyethylene and polystyrene.

The plasticizer is a kind of material added to material (plastic, resin) to improve its processability, softness, stretchability.

Polyvinyl chloride (PVC) was developed into a widely used synthetic resin after the plasticizing process was solved. 

The amount of plasticizer used in PVC accounts for 80% of the total plasticizer consumption. Stabilizer light stabilizer is a compound that can inhibit the degradation reaction caused by light induction. Usually refers to organic or organometallic compounds that only slightly fade or not fade plastic. Almost 75% of the light stabilizers are used in polyolefin resins, in which the light stable dose for polypropylene is equal to the sum of the light stable doses of all kinds of polyethylene resins. Visible, light stable

The agent is of special significance to polypropylene.

Metal activator is a kind of compound that can form inactive or almost inactive with metal with catalytic activity. The chelating agent can form a metal complex with high thermal stability. Metal activators are mainly used in communication wires with polyolefin as insulating material.

Lubricant

Lubricant is a compound that can reduce the friction resistance between the surfaces of product parts at service temperature. This additive is especially important for polyethylene film.

The anti-flushing modifier is a kind of polymer material to improve the toughness of plastics. Generally, a polymer anti-flushing modifier is added to improve the impact resistance of thermoplastic plastics. At present, in the world plastic additive market, about 15% of the anti-flushing modifiers,90% of which are used in rigid PVC products.

PVC anti-scour modifiers include chlorinated polyethylene, ABS、MBS( methyl methacrylate / butadiene / styrene terpolymer), polypropylene impact modifier has ethylene propylene rubber.

Packing and reinforcing materials

 A filler is a solid additive that is different in composition and structure from that of a plastic matrix by adding a polymer

In order to increase volume, improve its properties, reduce costs, usually inorganic; reinforced fillers are materials used to improve some mechanical and physical properties of polymers, such as improving the tensile strength of materials. Fillers and reinforcement materials are carbonates, glass fiber, aluminum hydroxide, and so on.

Colorants

A colorant is, as the name implies, a dye or pigment that gives color to a plastic. Pigments are more important to the plastics industry

Large, not only general pigments but also fluorescent, pearlescent and other decorative pigments. In the plastic industry, pigments are often pre-added to another resin (color carrier) that has good compatibility with the processed plastics to make "concentrated color" or "color masterbatch ". It can achieve uniform color and firm effect instead of pigment, and no dust pollution during operation.

Flame retardant

Flame retardant is a compound that can prevent combustion, reduce combustion speed or increase ignition point. Because plastic is rich

Organic materials containing carbon and hydrogen are flammable and must be flame retardant in use to meet the requirements of flame retardancy.

Antistatic agents

 An antistatic agent is a compound that reduces the chargeability of polymers. Since plastics are insulating materials, they are

When the material is in contact, the charge transfer will produce static electricity, so the plastic product is easy to adsorb dust, so an antistatic agent must be added to the processing.

Foaming agent

The foaming agent is a combination that can release gas by chemical reaction and make polymer body produce foam structure

Things. Foam is plastic produced with a foaming agent.

To correctly grasp the characteristics of various plastic additives, the scope of use and the amount of added can produce beautiful and durable plastic products.