PHA（聚羟基脂肪酸酯）是微生物发酵合成的天然高分子，能在自然环境（包括海水）中完全降解，被视为解决塑料污染的”绿色钥匙”。过去三十年它始终受制于成本——上世纪 80 年代每公斤生产成本超过 8 美元。转折出现在 2025-2026 年：截至 2025 年底全球 PHA 总产能约 4.52 万吨（中国占 1.48 万吨），由微构工场与安琪酵母合资的湖北微琪生物年产 3 万吨项目一期 1 万吨产线投产，成为国内首条万吨级 PHA 产线（总投资 10.5 亿元、自动化率 90%）。据隆众资讯数据，国内四家企业在建及拟建产能合计已达 6.1 万吨，超过现有全球存量。

成本破局是前提

清华大学陈国强团队开发的 NGIB（下一代工业生物技术）以嗜盐菌为底盘，无需灭菌、可开放连续生产，能耗与淡水消耗大幅下降。2026 年 5 月团队与企业联合宣布，PHA 生产成本已降至约 1.8 万元/吨，降幅超过 40%。”降解性能优越但成本太高”的行业铁律正在被改写，这是 6 万吨产能敢于集中落地的根本前提。

政策与包装应用双轮驱动

• 欧盟《包装与包装废弃物法规》（PPWR）自 2026 年 8 月起分阶段实施，2030 年起所有包装必须可回收。
• 2026 年 1 月，安琪酵母、微构工场、都佰城集团、金光集团 APP、恒鑫生活五方建立围绕 PHA 水性阻隔涂层的全产业链协同机制，覆盖”原料-改性-纸板-制品”。
• PHA 水性阻隔涂层可替代含氟（PFAS）阻隔方案，是纸基食品包装无氟化的天然落点。

对采购的启示

PHA 在水性涂层、薄膜、注塑与 3D 打印耗材等场景的牌号正快速丰富，价格与石油基塑料的差距持续收窄。建议纸包装、一次性用品与出口欧盟的客户，把 PHA 水性阻隔方案纳入 2027 年技术路线评估；在替代实验中重点关注涂层附着力、氧气/油脂阻隔与现有涂布线的工艺兼容性。

PHA (polyhydroxyalkanoates) is a microbially fermented polymer that fully biodegrades in natural environments including seawater. For 30 years it was held back by cost – above USD 8/kg in the 1980s. The turning point came in 2025-2026: global capacity reached about 45,200 t by end-2025 (14,800 t in China), and Weiqi Biotech – a joint venture of PhaBuilder and Angel Yeast – commissioned China’s first 10,000-tonne PHA line in Yichang (RMB 1.05 bn investment, 90% automation). Chinese projects under construction and planning now total 61,000 t, exceeding the entire existing global base.

Cost breakthrough first

NGIB (next-generation industrial biotechnology) developed by Prof. Guoqiang Chen’s team at Tsinghua uses halophiles that need no sterilization and run in open continuous processes. In May 2026 the team announced production costs down to about RMB 18,000/t – a cut of more than 40% – rewriting the old rule that PHA “degrades well but costs too much”.

Policy and packaging pull

• The EU Packaging and Packaging Waste Regulation (PPWR) phases in from August 2026; all packaging must be recyclable by 2030.
• In January 2026 five companies formed a full-chain alliance around PHA water-based barrier coatings, from raw material to paperboard and end products.
• PHA water-based barrier coatings can replace fluorinated (PFAS) systems – a natural entry point for fluorine-free paper packaging.

Takeaway for buyers

PHA grades are multiplying across coatings, films, injection molding and 3D printing, and the price gap with fossil plastics keeps narrowing. Paper-packaging and EU-exporting customers should put PHA water-based barrier systems on their 2027 roadmap, focusing on adhesion, oxygen/grease barrier and compatibility with existing coating lines.