1. Using more pure resin
Many plastics, especially in plastics such as polyvinyl chloride, styrene, poly (ethyl acetate), and acrylic esters, contain trace amounts of residual monomers that produce unpleasant odors. Resins with very difficult monomer residues can eliminate those odors
If a resin that is inherently odorless is used, it can also have very poor results. For example, DuPont Plastic Parts Processing Factory has developed a new grade of acetal copolymer, which releases very little odor during injection processing
2. Changing Additives
The tertiary amine of the catalyst used in the production of polyurethane foam often brings a very weak smell, and in addition, it also fogs on the interior window of the car. The solution to this problem is to find substitutes for these amines. One of the measures is to use polyhydroxy compounds, which are not only components of the polyurethane molecular chain, but also have catalytic activity. Some polyhydroxy compounds can replace half of the tertiary amine catalyst, The resulting product emits less odor
Phenol stabilizers used in PVC extrusion or rolling processes are often replaced by high odor zinc stabilizers. The heat stabilizer tin octanoate is also commonly used in automotive PVC products due to its high odor and low atomization characteristics. Plant extracted oils such as erucic acid and oleic acid have a much higher odor than amine lubricants made from animal extracted oils (used in polyolefin and styrene food packaging materials)
3. Adding adsorbent
If a small amount of zeolite (an aluminosilicate adsorbent) is filled in the polymer, it can play a role in removing material odor. Zeolite has a large number of crystalline discs, which can capture small gas molecules with odor. Molecular adsorbents have been successfully applied in polyolefin extrusion pipes, injection and extrusion blow molding containers, isolation packaging materials Extruded packaging materials and seals use polymers. Molecular adsorbed powders can also be added to plastics as moisture absorbents to remove moisture, which also helps plastic products produce odors