The plastic film containing biodegradable additives has the characteristics of biodegradation. When it is used and discarded by people, for example, in the garbage dump, as long as there are microorganisms, warmth, humidity and oxygen, the plastic products will break and be decomposed. The biodegradation rate largely depends on the natural conditions in the storage yard. The ideal environment is lively, warm and not too boring.

一般在3到7個(gè)月內(nèi)，塑料膜就開(kāi)始出現(xiàn)裂紋并變脆，其后，在第4-12個(gè)月內(nèi)就開(kāi)始決裂并被細(xì)菌腐蝕消化。比較初的光降解和快速分解是通過(guò)添加劑中的金屬離子預(yù)降解成分促成的。而添加劑中的植物纖維素首要為土壤里的微生物的滋長(zhǎng)供給營(yíng)養(yǎng)，從而使各種菌類(lèi)在膜的里里外外迅速成長(zhǎng)。大大小小的決裂導(dǎo)致膜變得破壞，并比較終被生物分解成二氧化碳和水。

Generally, the plastic film begins to crack and become brittle within 3 to 7 months, and then begins to crack and be corroded and digested by bacteria within 4 to 12 months. The initial photodegradation and rapid decomposition are promoted by the metal ion predegradation component in the additive. The plant cellulose in the additive mainly provides nutrition for the growth of microorganisms in the soil, so that various fungi grow rapidly inside and outside the membrane. Large and small cracks lead to the destruction of the membrane, which is finally biologically decomposed into carbon dioxide and water.

生物降解顆粒的降解功能

Degradation function of biodegradable particles

對(duì)生物降解顆粒的降解功能的測(cè)驗(yàn)?zāi)壳斑€沒(méi)有制訂一致的規(guī)范，可采用包括被美國(guó)顆粒試驗(yàn)規(guī)范(ASTM)采用或預(yù)備采用的辦法作為規(guī)范的辦法，通過(guò)生物化學(xué)和微生物的試驗(yàn)手法來(lái)評(píng)價(jià)的首要辦法有下列幾種。

At present, there is no uniform standard for testing the degradation function of biodegradable particles. The methods adopted or prepared by the American particle test specification (ASTM) can be used as the standard methods. The primary methods for evaluation by biochemical and microbial test methods are as follows.

土埋法，土埋法有室外土埋法和室內(nèi)土埋法兩種，其微生物源首要是土壤中的微生物群，經(jīng)必定時(shí)刻后，取出試樣測(cè)定其失重、機(jī)械功能改變，或用電子顯微鏡確定其被土壤中微生物侵襲的狀況。

Soil burying method: there are two kinds of soil burying methods: outdoor soil burying method and indoor soil burying method. The microbial source is mainly the microbiota in the soil. After a certain time, take out the sample to determine its weight loss and mechanical function change, or use the electron microscope to determine its invasion by the microorganisms in the soil.

長(zhǎng)處是能反映出自然環(huán)境條件下的生物分解功能;缺陷是試驗(yàn)周期長(zhǎng)，試驗(yàn)成果因土質(zhì)不同而不同，重復(fù)性差。陪替氏培育器定量法在容器中加入試驗(yàn)樣品和營(yíng)養(yǎng)瓊脂，接種微生物進(jìn)行培育，經(jīng)必定時(shí)刻后，剖析試樣的失重狀況以及某些物理改變或化學(xué)改變。

The advantage is that it can reflect the biological decomposition function under natural environmental conditions; The defect is that the test period is long, the test results are different due to different soil properties, and the repeatability is poor. Quantitative method of Petri dish incubator: add the test sample and nutrient agar into the container, inoculate microorganisms for cultivation, and analyze the weight loss and some physical or chemical changes of the sample after a certain time.

生物降解顆粒的降解原理以及降解功能基礎(chǔ)內(nèi)容便是這樣了，您可以作為參考使用，當(dāng)然您對(duì)其有什么問(wèn)題要咨詢(xún)的話(huà)，就來(lái)我們網(wǎng)站http://m.qylxschool.cn多看看吧。

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