What to do if the smell is heavy when plastic parts are processed
1. Use purer resin
Plastic products processing manufacturers in many plastic parts, pay attention to polyvinyl chloride, styrene, polyethyl acetate and acrylate and other plastics, the remaining small amount of monomer will produce an unpleasant odor, the use of monomer residual resin can remove those odors.
2. Change the additive
The tertiary amine, the catalyst used in the production of polyurethane foam, often has a weak odor and fogs up car windows. The solution is to find alternatives to these amines: using polyhydroxy compounds, the residual hydroxy compounds are not only components of the polyurethane molecular chain, so they are catalytically active, and some polyhydroxy compounds can replace half of the tertiary amine catalyst, so that the odor emitted by the obtained product is less redundant.
3. Add adsorbent
If a small amount of zeolite (an aluminosilicate adsorbent) is filled with a polymer, it can play a role in removing the odor of the material. Zeolite has a large number of crystalline disks, which can capture those odorous gas small molecules, molecular adsorbents have been successfully used in polyolefin extrusion pipes, injection and extrusion blow molding containers, barrier packaging materials, extruded outer packaging materials and sealing polymers.
Flammable level division of plastic products: according to the combustible level: flammable plastics: this type of plastic is violently extinguished after an open flame and is not easy to extinguish. Such as nitrocellulose plastics, which are listed as risky products. Combustible plastics: Such plastics are extinguished by open flame and have no self-extinguishing properties, but the extinguishing speed is faster. Such as polyethylene, polypropylene, etc. Flame retardant plastics: This type of plastic can be extinguished in a strong open flame and extinguished soon after leaving the fire.
Such as phenolic plastics, acetate plastics, polyvinyl chloride plastics, etc. Glass transition temperature: refers to the transition temperature of amorphous polymers (including amorphous parts in crystalline polymers) from glass to highly elastic or perhaps the former. It is the high temperature of the free movement of the amorphous polymer macromolecular segment, and it is also the lower limit of the task temperature of the product.
Analysis of melting temperature by custom plastic product molding manufacturers: Regarding crystalline polymers, it refers to the temperature at which the three-dimensional short-range ordered state of the macromolecular chain structure transitions to a disordered viscous flow state, also known as the melting point. The price of ABS plastic is the upper limit of the processing temperature of crystalline polymer molding. Active temperature: refers to the temperature at which the amorphous polymer transitions from a highly elastic state to a viscous flow state. It is the upper limit of the processing temperature of amorphous plastics. Inactive temperature: A low temperature at which there is no onset of activity under certain pressure. It is to participate a certain amount of plastic in the upper end of the capillary rheometer mouth die in the barrel, heating to a certain temperature, constant temperature 10min, apply 50MPA constant pressure, if the material does not flow out of the mouth mold, after unloading the pressure, the material temperature will be reduced by 10 degrees, and then a constant pressure of different sizes will be applied after 10 minutes, and so on until the melt flows out of the mouth die, and the temperature is reduced by 10 degrees is the inactive temperature of the material. Decomposition temperature: refers to the decomposition temperature of the viscous polymer when the temperature is further reduced, the degradation of the molecular chain will be intensified, and the temperature when the polymer molecular chain is clearly degraded is the decomposition temperature.
Understand the function of the product and distinguish whether it can be toxic: this time it depends on what material the plastic is made of, and whether plasticizers, fluctuations, etc. are added to it. Plastic food bags, feeding bottles, pails, kettles, etc. sold in the ordinary market, mostly polyethylene plastic, smooth to the touch by hand, the appearance is like a layer of wax, easy to extinguish, flame yellow and wax dripping, paraffin smell, this plastic is non-toxic. Industrial packaging plastic bags or containers, mostly made of polyvinyl chloride, outside to participate in lead-containing salt fluctuation agents. When this plastic is touched by hand, it is sticky, not easy to extinguish, it is extinguished when it is separated from the fire, the flame is green, and the amount is heavier, this plastic is toxic.
