Recycled plastics have odors and release vocs, adsorbents and antibacterial agents used to solve this, building a beautiful earth together with green and low carbon

As is well known, plastic products used in cars and indoors can emit odors and release VOCs.Currently, the relevant national and industry standards clearly specify the types and concentrations of harmful volatile organic compounds.There is no unified standard for odor regulation, and the correlation between VOCs and odors is unclear. For example, volatile organic compounds that are highly hazardous to human health are not necessarily the substances that cause odors in products, such as benzene, toluene, ethylbenzene, formaldehyde, etc. When an odor can be detected, its concentration is already dozens of times above the standard limit!

Graph | Requirements for Concentration of Organic Compounds in Vehicle Interior Air Source | GB/T 27630—2011 Guidelines for the Evaluation of Air Quality in Passenger Vehicle Interiors

Additionally, there are some volatile organic compounds with extremely low odor thresholds present in cars and indoors, such as acetaldehyde, amines, and sulfur-containing compounds, which can produce a noticeable smell even in very small amounts.

In addition to the odor threshold and odor type of VOCs themselves, different people have significant differences in their perception of odors. The smell emitted by plastic products that we usually detect is composed of various molecules, and its generation process is illustrated in the following diagram.

Table: Effects of Jiahe Deodorant and Its Dosage on the Odor and VOCs Content of PP Composites

From the table, it can be seen that with the increase in the amount of odor adsorbent, the odor of PP composites is significantly improved, and the VOCs content is significantly reduced.When the dosage of JH-200A is 0.5%, the odor level improves by 0.5-1 grade compared to before.In a high-temperature environment, JH-200A can physically adsorb small molecules volatilized from PP composite materials, thereby reducing odor and VOCs.

BM-104KJ is a zinc-based antibacterial agent.It appears as a white powder with an average particle size of approximately 1.5μm. It has a broad inhibitory effect on molds and bacteria, with low risk of discoloration and good durability. It is registered in the SIAA (Society of International sustaining growth for Antimicrobial Articles) list of inorganic antifungal agents and complies with the requirements of China's food contact material standard GB9685-2016. Test data shows that adding 0.3%-0.5% to ABS resin achieves an antibacterial activity value (R) of 2.0 or higher against E. coli and Staphylococcus aureus; when added at 2.0% to HIPS resin, the 28-day antifungal test results in a mold resistance rating of 0 (i.e., no mold growth observed).

BM-502KEThis belongs to the silver-zinc composite system product, also a white powder, with an average particle size of about 6μm. While maintaining the high antibacterial efficiency of silver-based antibacterial agents, it further optimizes water resistance and light resistance, significantly reducing the risk of silver ions discoloration. This product is suitable for various resins such as PP and PE, with a recommended addition amount of 0.3%-0.5%. It has been successfully applied in kitchenware, home appliances, and fiber products.

From a technical perspectiveInorganic antimicrobial agents, compared to organic antimicrobial agents, have higher heat resistance (can withstand temperatures above 600℃), better safety, and more lasting antimicrobial effects. However, attention should also be paid to the complex reactions that may occur with certain additives in resins (such as sulfur-containing or halogen-containing stabilizers). These reactions can sometimes lead to discoloration of the product. Therefore, before practical application, it is usually recommended to conduct tests.Resistant to light and heat Perform verification by conducting color fastness tests.

In terms of regulationsThe Bactekiller series has actively responded to regulatory requirements in major global markets, including obtaining registrations or compliance statements with the US EPA, FDA (food contact), EU BPR (Biocidal Products Regulation), and China's GB9685. This provides significant support for its global application in a wide range of fields such as daily necessities, home appliances, building materials, and medical supplies.

In conclusion, integrating antibacterial functionality into plastic products, much like addressing odor issues, is a key aspect of innovation in material functionality.Choose thoroughly validated, regulatory compliant, and substrate-compatible antimicrobial agents, and combine them with rigorous testing to reliably develop high value-added plastic products that meet market demands for health and hygiene.。