生物降解塑料是指一類由自然界存在的微生物如細(xì)菌、霉菌（真菌）和藻類的做用而引起降解的塑料。理想的生物降解塑料是一種具有優(yōu)良的使用性能、廢棄后可被環(huán)境微生物完全降解、終被無機(jī)化而成為自然界中碳素循環(huán)的一個(gè)組成部分的高分子材料。

Biodegradable plastics refer to a type of plastic that is degraded by natural microorganisms such as bacteria, fungi, and algae. The ideal biodegradable plastic is a polymer material with excellent performance, which can be completely degraded by environmental microorganisms after being discarded, and ultimately becomes an integral part of the carbon cycle in nature through inorganic transformation.

“紙”是一種典型的生物降解材料，而“合成塑料”則是典型的高分子材料。因此，生物降解塑料是兼有“紙”和"合成塑料"這兩種材料性質(zhì)的高分子材料。

"Paper" is a typical biodegradable material, while "synthetic plastic" is a typical polymer material. Therefore, biodegradable plastics are polymer materials that combine the properties of both paper and synthetic plastics.

在自然界各種條件下，終完全降解變成二氧化碳（CO2）或/和甲烷、水（H2O）及其所含元素的礦化無機(jī)鹽以及新的生物質(zhì)的一種塑料。

A plastic that completely degrades into carbon dioxide (CO2) or/and methane, water (H2O) and its mineralized inorganic salts, as well as new biomass under various natural conditions.

當(dāng)生物可降解材料被扔到大自然中，經(jīng)過一定條件（土壤、沙土、堆肥、厭氧、水性培養(yǎng)液等），自然分解為小塊，實(shí)質(zhì)就是高分子斷裂的過程，再經(jīng)過外界條件的摧殘，分解為大分子，再分解為小分子，被微生物吸收后，釋放二氧化碳和水，同時(shí)植物通過光合作用，釋放出氧氣，整個(gè)循環(huán)過程，非常環(huán)保。

When biodegradable materials are thrown into nature and undergo certain conditions (soil, sand, compost, anaerobic, water-based culture medium, etc.), they naturally decompose into small pieces, which is essentially the process of polymer fracture. After being subjected to external conditions, they decompose into large molecules, which are then broken down into small molecules. After being absorbed by microorganisms, they release carbon dioxide and water. At the same time, plants release oxygen through photosynthesis, and the entire cycle process, Very environmentally friendly.

目前主要分為四大類，PLA類（聚乳酸）、PBS類（聚酯類）、PBAT類（聚酯類）、PHA類（聚羥基烷酸酯）。

At present, it is mainly divided into four categories: PLA (polylactic acid), PBS (polyester), PBAT (polyester), and PHA (polyhydroxyalkanoates).

PLA：是常見的可降解塑料之一，是以乳酸為主要原料聚合得到的聚合物。PLA生產(chǎn)過程無污染，而且產(chǎn)品可以生物降解，使用后的PLA可以通過堆肥，在溫度高于55℃或富氧和微生物作用下降解為二氧化碳和水，實(shí)現(xiàn)在自然界中的物質(zhì)循環(huán)，不會(huì)對(duì)環(huán)境產(chǎn)生影響。目前聚乳酸的生產(chǎn)主要采用丙交酯開環(huán)聚合工藝將乳酸先脫水生成低聚物，然后解聚生成丙交酯，再開環(huán)聚合制得聚乳酸。 PLA還具有可靠的生物性、生物可降解性、良好的力學(xué)性能和易加工性，廣泛用于包裝、紡織行業(yè)、農(nóng)用地膜和生物醫(yī)用高分子等行業(yè)。是可降解塑料研究中非?；钴S和市場應(yīng)用好降解材料之一,PLA在生物降解塑料中具有相對(duì)較低的成本，PLA的消費(fèi)量居于前列。

PLA: is one of the common biodegradable plastics, which is a polymer polymerized from lactic acid as the main raw material. The production process of PLA is pollution-free, and the product can be biodegraded. After use, PLA can be decomposed into carbon dioxide and water through composting at temperatures above 55 ℃ or under the action of enriched oxygen and microorganisms, achieving material circulation in nature without affecting the environment. At present, the production of polylactic acid mainly adopts the propylene glycol ring opening polymerization process to dehydrate lactic acid to form oligomers, then depolymerize to form propylene glycol, and then open the ring polymerization to obtain polylactic acid. PLA also has reliable biosafety, biodegradability, good mechanical properties, and ease of processing, and is widely used in industries such as packaging, textile, agricultural films, and biomedical polymers. PLA is one of the most active and widely used biodegradable materials in the research and market of biodegradable plastics. It has a relatively low cost in biodegradable plastics and its consumption is among the top.

PBS：是由于丁二酸和1,4-丁二醇經(jīng)縮合聚合而成，原料來源為石油或生物資源發(fā)酵。 PBS易被自然界的多種微生物或酶終分解為二氧化碳和水，具有良好的生物相容性和生物可吸收性，良好的耐熱性能。 PBS可以用包裝薄膜、餐具、發(fā)泡包材、日用品瓶、藥品瓶、農(nóng)用薄膜、農(nóng)藥及化肥緩釋材料等領(lǐng)域。由于丁二酸原料有限，PBS的衍生物PBAT和PBSA順應(yīng)而生，其與PBS的性能基本相似，但加工性能不及PBS。

PBS: It is formed by condensation polymerization of succinic acid and 1,4-butanediol, with raw materials sourced from petroleum or biological resource fermentation. PBS is easily decomposed into carbon dioxide and water by various microorganisms or enzymes in nature, and has good biocompatibility and bioabsorbability, as well as good heat resistance. PBS can be used in fields such as packaging films, tableware, foam packaging materials, daily necessities bottles, pharmaceutical bottles, agricultural films, pesticide and fertilizer slow-release materials. Due to the limited availability of succinic acid raw materials in China, PBS derivatives PBAT and PBSA have emerged, which have similar properties to PBS but lower processing performance than PBS.

PBAT：屬于熱塑性可降解塑料，一般以脂肪族酸、丁二醇為原料，經(jīng)石化途徑或生物發(fā)酵途徑生產(chǎn)，既有較好的延展性和斷裂伸長率，也有較好的耐熱性和沖擊性能。由于PBAT的成膜性能良好，易于吹膜，廣泛用于一次性包裝膜及農(nóng)膜領(lǐng)域。 PBAT 的缺點(diǎn)是降解條件相對(duì)苛刻。

PBAT: It belongs to thermoplastic degradable plastics, generally produced from aliphatic acids and butanediol through petrochemical or biological fermentation pathways. It has good ductility and elongation at break, as well as good heat resistance and impact performance. Due to its excellent film-forming performance and ease of blowing, PBAT is widely used in the fields of disposable packaging films and agricultural films. The disadvantage of PBAT is that the degradation conditions are relatively harsh.

PHA：PHAs類可降解塑料有聚羥基脂肪酸酯（PHA）、聚3-羥基丁酸酯（PHB）等類別，PHA的降解方式很特別，使用完后PHA可以在生物體內(nèi)完全降解成β-羥基丁酸、二氧化碳和水。 PHAs類可降解塑料熱變形溫度高、具有良好的生物相容性，但加工溫度范圍窄、熱穩(wěn)定性差、脆性大、生產(chǎn)質(zhì)量不穩(wěn)定、可用于一次性用品、醫(yī)療器械手術(shù)服、包裝袋和堆肥袋、醫(yī)用縫線、修復(fù)裝置、繃帶、骨科針、防黏連膜及支架等領(lǐng)域。

PHA: PHA degradable plastics include categories such as polyhydroxyfatty acid esters (PHA), polyhydroxybutyrate (PHB), etc. The degradation method of PHA is very unique, and after use, PHA can be completely degraded into β- Hydroxybutyric acid, carbon dioxide, and water. PHAs biodegradable plastics have high thermal deformation temperature and good biocompatibility, but their processing temperature range is narrow, thermal stability is poor, brittleness is high, and production quality is unstable. They can be used in disposable products, medical equipment surgical gowns, packaging bags and compost bags, medical sutures, repair devices, bandages, orthopedic needles, anti adhesive films and brackets, and other fields.

本文來自：生物降解顆粒更多的內(nèi)容請(qǐng)點(diǎn)擊：http://www.qylxschool.cn我們將會(huì)為您提問的問題提供一個(gè)滿意的服務(wù)，歡迎您的來。

This article is from: Biodegradable particles. For more information, please click on: http://www.qylxschool.cn We will provide a satisfactory service for the questions you ask, and welcome you to come.