Additive category description
2013-07-26 by seoer8
According to the plastic additive to improve functional differences, there are many different titles additives. Specifically, from the increase of the processing
characteristics of the substrate.
Additives include: ① Liquidity: slip agent; ② thermal stability; ③ PVC heat stabilizer , antioxidants; ④ dispersion: processing aids, dispersants; ⑤ Compatibility:
Compatible, coupling agents; ⑥ melt strength: cross-linking agent , thickening agent. Increasing the substrate from the physical and chemical characteristics
Terms of analysis, additives include: ① rigidity, strength: fillers, nucleating agents; ② impact: the impact modifier; ③ Heat resistance: fillers, nucleating
agents; ④ Flammability: flame retardants; ⑤ weatherability : Stabilizer UV stabilizers; ⑥ Conductivity: antistatic agents guide
Electric paint filler; ⑦ Color: pigment; ⑧ Flex: plasticizers processing oil; ⑨ density: ffoaming agent ; ⑩ Transparency: nucleating agents, sexual health:
?Additives are mainly the following categories:
1, anti-oxidants unsaturated double bonds in the plastic by an oxygen atom, the invasion of heat and light, free radicals cause fracture, thereby causing a chain
reaction, the molecular chains or the formation of the crosslink, resulting in reduction in strength of plastic products or brittle. Antioxidants function in
The delay due to oxidation and decomposition of the plastic, extending the life of plastic products. Plastics industry antioxidant used can be classified by function:
(1) the oxidation chain reaction inhibitors: such as phenol, butyl toluene, aromatic amines, phenyl-B-resistant amine, alkyl of Kun, alkenyl
Bisphenols, alkyl phenol sulfide, such as phenyl salicylate means. (2) peroxide decomposers: alcohols such as Liu acute thioether sulfur propionate, organic
phosphorous compounds, such as disulfide sulfonate. (3) Heavy metals Not activator: such as an amide compounds, together amide, aromatic amines
2, an antistatic agent antistatic agent's main function is given to produce a conductive plastic, so as to avoid the accumulation of static electricity caused by
friction. Antistatic agents are commonly used quaternary ammonium salts, ethoxylated amines, and sulfonated fatty acid esters wax and the like.
3, blowing the plastic blowing agent are mainly three types: ① nitrogen, carbon dioxide, and air, and directly pressed into the plastic melt adhesive foam
manipulation; ② volatile liquid such as butane, pentane, petroleum ether, Difluorobenzophenone chloromethane, after evaporation at elevated temperature expansion,
leaving the plastic body fat
Foam, polystyrene foam is commonly belong to this type; ③ decomposable chemical blowing agent, such foaming agent is usually a solid powder, which is decomposed when
heated discharge gas is usually nitrogen or carbon dioxide), leaving the plastic producing cell-like structure, and reduce weight.
More blowing agents such as organic azo compounds such as azobis formamide, azobis isobutyrate Clear. Foamed plastic are: ABS, PS, PVC, PU, ??EVA, PE, PP and so on.
4, flame retardants when adding flame retardant plastics exposed to flame, the flame spread on their own suppressed to prevent the formation of smog, when the flame
will stop burning when removed. Flame retardants used in plastics principle broadly divided into three categories: (1) reactive type flame retardants can be used with
Should form an inert gas, shrouded in the combustion four weeks, reducing the combustion oxygen levels in order to achieve the purpose of terminating the combustion.
Any combustion can produce CO, CO2, NH3 and halogen compounds, such as PVC, PU foam, polyester or epoxy all adopt this law. (2)
Non-reactive type flame retardants containing halogens, phosphorus, nitrogen or boron compounds, when combustion occurs, you can break out of an inert material, draped
in plastic burning surface, forming a layer barrier to isolate outside of oxygen, to achieve the purpose of fire. (3) an aqueous oxygen
Compounds such as flame retardants alumina suffered burns, can emit water vapor, the heat absorbing combustion process, so that lowering the ambient temperature
combustion of inhibiting the spread of fire to prevent the formation of smog.
5, the lubricant agent can be divided into internal slip slip agent and an external slip agent, internal lubricant main function is to improve the flow of the resin,
the resin molecular chains to reduce internal friction, such as fatty acids, lipids (stearic glycerides); external lubricant in reducing resin processing machinery
The adhesion and improve surface smoothness easy release.
?6, impact modifier, impact resistance modifier is usually a special way in the kneaded resin added to improve the impact resistance of plastics. Impact resistance
modifier often affects the plastic heat resistance, fluidity or workability, the choice must be careful.
7, most of the synthetic resin plasticizer is malleable, but not the same size of plasticity, the resin is easy to plasticize and softness conferred products, usually
in the resin add some low molecular weight substances, these low molecular weight compounds known as growth plasticizers. Plasticizers are liquid or
Low melting point, and the resin should have a good miscibility. The plasticizer used phthalates, aliphatic dibasic acid esters, phosphoric acid esters, and
?8, the colorant is to beautify and decorate the plastic material is added in the pigment-containing additive is called a coloring agent.
?9, the filler is added to the batch of plastic to reduce costs, and sometimes also improve the physical properties of plastic, such as hardness, rigidity and impact
strength relatively inert substance called filler. The most commonly used filler material is clay, silicates, talc, carbonates.