Plastic barrel products will emit unpleasant odors. In order to overcome this problem to meet customer needs, plastic barrel manufacturers have long been working to reduce the divergence level of these odors. The method has a brief summary:
1. Change additives
The tertiary amines used in the production of polyurethane foams often give rise to strong odors and fog on the interior windows of automobiles. The solution to this problem is to find alternatives to these amines. One of the measures is to use a polyhydroxy compound which is not only a component of the polyurethane molecular chain but also has catalytic activity. Some polyols can even replace half of the tertiary amine catalyst, and the resulting product emits a much weaker odor.
Phenolic stabilizers used in PVC extrusion or calendering processes are also often replaced by low odor zinc stabilizers. The heat stabilizer tin octylate is also commonly used in automotive PVC products due to its low odor and low atomization properties. Plant extract oils such as erucic acid and oleic acid are much less odorous than amine lubricants (for polyolefin and styrenic food packaging materials) made from animal extract oils.
2, using a more pure resin
In many plastics, especially in plastics such as polyvinyl chloride, styrene, polyethyl acetate and acrylates, residual traces of monomers can produce unpleasant odors. Those odors can be eliminated by using a resin with a small amount of monomer remaining.
If you use a resin that is itself odorless, it also has a good effect. For example, the DuPont Plastic Barrel Factory has developed a new grade of acetal copolymer that emits very small amounts of odor during the injection process.
3. Adding adsorbent
If a small amount of zeolite (an aluminosilicate adsorbent) is filled in the polymer, the effect of removing the odor of the material can be achieved. Zeolites have a large number of crystalline voids that capture small molecules of odorous gases. Molecular adsorbents have been successfully used in polyolefin extruded tubing, injection and extrusion blow molded containers, insulation packaging materials, extruded outer packaging materials and sealing polymers. Molecularly adsorbed powders can also be added to plastics as moisture absorbers to remove water vapor, which can also contribute to the odor of plastic products.https://www.fhpails.com