Is PBAT really biodegradable?

Biodegradable plastics are degradable plastics that are degraded by microorganisms in nature.

Microorganisms refer to microorganisms with small size, simple structure and various types, mainly including bacteria, molds, yeasts, mycoplasma, viruses, etc. Ideal biodegradable plastics can gradually degrade under the action of microorganisms until they are finally decomposed into carbon dioxide and water.

PBAT is a highly biodegradable polymer that breaks down completely when home composted, leaving no toxic residue behind. This makes it an excellent alternative to toxic or harmful materials like plastic and other non-biodegradable plastics. When pbat biodegradable is put into compost, it breaks down significantly faster than plastic.

First, pbat manufacturer-Unilong uses adipic acid (AA), terephthalic acid (PTA), and butylene glycol (BDO) as monomers to synthesize polybutylene adipate/terephthalate in a certain proportion. The key points in the process It lies in strictly controlling the esterification method, esterification time, polycondensation temperature, stabilizer, etc. of the reaction. These key factors can directly affect the synthesis process and ultimately the performance of the product.

The optimal conditions for the pbat polymer process are the cooperation of temperature, humidity, light, soil environment and microorganisms.

Under normal circumstances, PBAT can be quickly decomposed by microorganisms when the external temperature exceeds 50C. The relationship between the microbial decomposition rate and temperature is linear. When the decomposition rate of PBAT exceeds 50C or above 30C, it can be rapidly decomposed by microorganisms. The relationship between microbial decomposition rate and temperature is linear. Below 50C or above 30C, the decomposition rate of PBAT is slower, but it can still be completely degraded.

Biodegradation in soil involves several key steps as follows:

(1) Microorganisms colonize on the polymer surface;

(2) The secretion of extracellular microbial enzymes degrades polymers into low molecular weight compounds;

(3) Microbial uptake and utilization of these compounds, incorporating them into biomass as polymeric carbon or releasing them in the form of carbon dioxide.

Under the condition of pH 7, dimethyl terephthalate (DMT) with a concentration of 98 mg/L can be completely degraded within 36 days. The main intermediate products are methyl terephthalate (MMT) and terephthalate. Formic acid (TA).

Under mixed culture conditions, dimethyl isophthalate with a concentration of 220 mg/L is degraded to more than 99% within 35 days, but its intermediate product monomethyl isophthalate (MMT) cannot be degraded and remains in the culture medium. accumulation.

Dimethyl terephthalate is more susceptible to degradation than dimethyl isophthalate. According to the identified intermediate products, the biochemical degradation pathway of dimethyl terephthalate is: DMT→MMT→TA→CO2 +H2O

To sum up, PBAT is really biodegradable. If you need more information, please contact pbat suppliers-Unilong!

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