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Seven ways to help you solve the peculiar smell of plastic
by：Lisson
2021-04-07
Plastic products emit unpleasant odors during processing. In order to overcome this problem, everyone has been working on reducing these odors for a long time. In addition, many friends will add a certain proportion of recycled materials to the new materials, and the taste will be heavier during granulation production. This is a common problem in production. The following provides you with several solutions:
The cause of peculiar smell after granulation
Materials are more complicated
Material has been processed and degraded many times
Classification of small molecule materials in materials
Sometimes materials with mixed moisture play a strong role in accelerating degradation
Because plastic products are added with additives or recycled materials, the plastic products carry ethylene, hydrogen sulfide, sulfur dioxide, amine, ammonia, or other odors. Part of the odor is released after the product is stored for a period of time; sometimes it is lurking in the plastic product, and these harmful gases are released after the secondary processing, which constitutes the peculiar smell of the plastic. The typical method to solve the peculiar smell is to add gas adsorbent and anti-jun agent to the plastic to prevent the unpleasant smell due to the effect of fine jun and real jun. Solvent extraction and venting can also be used to reduce residual odors.
Plastic odor treatment
1. Correct use of additives
The catalyst tertiary amine used in the production process of polyurethane foam often brings strong odor, and it also fogs up on the car's inner window. 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 a component of the polyurethane molecular chain, but also have catalytic activity.
Phenolic stabilizers used in the process of PVC extrusion or calendering are often replaced by low-odor zinc stabilizers. The heat stabilizer tin octoate is also commonly used in automotive PVC products due to its low odor and low fogging characteristics. Plant-derived oils such as erucic acid and oleic acid have much less odor than amine lubricants made from animal-derived oils (used in polyolefin and styrene food packaging materials).
2, the treatment of re-lifting
There are several solvent extraction methods to help remove odor-producing compounds. A new solvent extraction method also uses supercritical carbon dioxide as a solvent. This technology has been applied to HDPE and PET. It can remove odorous pollutants from oil containers, pesticide containers and other waste devices. . The advantage of the carbon dioxide extractant is that it will not bring about the troublesome post-processing problems of several solvents.
odor removal device is an integral part of the waste plastic pellet extruder, it can also be calibrated to remove some strong volatile compounds that can produce odor.
3. Using purer resin
In many plastics, especially in plastics such as polyvinyl chloride, styrene, polyethyl acetate, and acrylate, residual trace monomers can produce unpleasant odors. Those odors can be eliminated by using a resin with a small amount of residual monomers.
4. Add adsorbent
If a small amount of zeolite (an aluminosilicate adsorbent) is filled in the polymer, it can play a role in removing the odor of the material. Zeolite has a large number of crystalline voids, these voids can capture those small gas molecules with odor.
molecular adsorbents have been successfully applied to polyolefin extrusion pipes, injection and extrusion blow molding containers, isolation packaging materials, extrusion molding outer packaging materials and sealing polymers. Molecular adsorption powder can also be added to plastic as a moisture absorbent to remove water vapor, which will also help plastic products produce odor.
5. Using anti-jun agent
Adding an anti-jun agent to the plastic can not only reduce the odor, but also delay the surface aging, discoloration and brittleness of the product. The commonly used anti-jun agents are 10,10'-oxobisphenoxain (OBPA), trioxydiphenyl ether (Triclosan), isothiazolinone (OIT), and pyrithione (Pyrithione). Several metal compounds containing tin and silver are sometimes used as anti-jun agents.
6. Use desorption method
Another way to deodorize is to put plastic in odor adsorbents such as live carbon and high surface area silicate. The vacuum treatment environment can make this desorption process block.
Treatment of plastic particles with a special detergent solution can also help remove odors. Generally speaking, these cleaners are aqueous or alkaline solutions containing surfactants. These cleaners can remove vinyl chloride monomers, styrene, acrylic esters, acrylic monomers and unsaturated hydrocarbons.
7. Add fragrance
Adding fragrances to plastics can't eliminate unpleasant odors, but it can cover these odors. In many cases, this is enough to achieve the purpose. The method can be applied to polyethylene, polypropylene and polyolefin thermoplastic elastomers, and processing methods include injection molding, extrusion or blow molding.
The retention time of fragrance is not necessarily the same as the life of the molded part. Its retention time is determined by its degree of aggregation, volume-to-surface area ratio, whether it is exposed to heat or humidity, and whether the molded part is tightly insulated and air-packed And other factors. Fragrances are generally used in toys, daily commodities, cosmetic containers, household appliances and gardening equipment.
The cause of peculiar smell after granulation
Materials are more complicated
Material has been processed and degraded many times
Classification of small molecule materials in materials
Sometimes materials with mixed moisture play a strong role in accelerating degradation
Because plastic products are added with additives or recycled materials, the plastic products carry ethylene, hydrogen sulfide, sulfur dioxide, amine, ammonia, or other odors. Part of the odor is released after the product is stored for a period of time; sometimes it is lurking in the plastic product, and these harmful gases are released after the secondary processing, which constitutes the peculiar smell of the plastic. The typical method to solve the peculiar smell is to add gas adsorbent and anti-jun agent to the plastic to prevent the unpleasant smell due to the effect of fine jun and real jun. Solvent extraction and venting can also be used to reduce residual odors.
Plastic odor treatment
1. Correct use of additives
The catalyst tertiary amine used in the production process of polyurethane foam often brings strong odor, and it also fogs up on the car's inner window. 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 a component of the polyurethane molecular chain, but also have catalytic activity.
Phenolic stabilizers used in the process of PVC extrusion or calendering are often replaced by low-odor zinc stabilizers. The heat stabilizer tin octoate is also commonly used in automotive PVC products due to its low odor and low fogging characteristics. Plant-derived oils such as erucic acid and oleic acid have much less odor than amine lubricants made from animal-derived oils (used in polyolefin and styrene food packaging materials).
2, the treatment of re-lifting
There are several solvent extraction methods to help remove odor-producing compounds. A new solvent extraction method also uses supercritical carbon dioxide as a solvent. This technology has been applied to HDPE and PET. It can remove odorous pollutants from oil containers, pesticide containers and other waste devices. . The advantage of the carbon dioxide extractant is that it will not bring about the troublesome post-processing problems of several solvents.
odor removal device is an integral part of the waste plastic pellet extruder, it can also be calibrated to remove some strong volatile compounds that can produce odor.
3. Using purer resin
In many plastics, especially in plastics such as polyvinyl chloride, styrene, polyethyl acetate, and acrylate, residual trace monomers can produce unpleasant odors. Those odors can be eliminated by using a resin with a small amount of residual monomers.
4. Add adsorbent
If a small amount of zeolite (an aluminosilicate adsorbent) is filled in the polymer, it can play a role in removing the odor of the material. Zeolite has a large number of crystalline voids, these voids can capture those small gas molecules with odor.
molecular adsorbents have been successfully applied to polyolefin extrusion pipes, injection and extrusion blow molding containers, isolation packaging materials, extrusion molding outer packaging materials and sealing polymers. Molecular adsorption powder can also be added to plastic as a moisture absorbent to remove water vapor, which will also help plastic products produce odor.
5. Using anti-jun agent
Adding an anti-jun agent to the plastic can not only reduce the odor, but also delay the surface aging, discoloration and brittleness of the product. The commonly used anti-jun agents are 10,10'-oxobisphenoxain (OBPA), trioxydiphenyl ether (Triclosan), isothiazolinone (OIT), and pyrithione (Pyrithione). Several metal compounds containing tin and silver are sometimes used as anti-jun agents.
6. Use desorption method
Another way to deodorize is to put plastic in odor adsorbents such as live carbon and high surface area silicate. The vacuum treatment environment can make this desorption process block.
Treatment of plastic particles with a special detergent solution can also help remove odors. Generally speaking, these cleaners are aqueous or alkaline solutions containing surfactants. These cleaners can remove vinyl chloride monomers, styrene, acrylic esters, acrylic monomers and unsaturated hydrocarbons.
7. Add fragrance
Adding fragrances to plastics can't eliminate unpleasant odors, but it can cover these odors. In many cases, this is enough to achieve the purpose. The method can be applied to polyethylene, polypropylene and polyolefin thermoplastic elastomers, and processing methods include injection molding, extrusion or blow molding.
The retention time of fragrance is not necessarily the same as the life of the molded part. Its retention time is determined by its degree of aggregation, volume-to-surface area ratio, whether it is exposed to heat or humidity, and whether the molded part is tightly insulated and air-packed And other factors. Fragrances are generally used in toys, daily commodities, cosmetic containers, household appliances and gardening equipment.
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