兰州一家做全降解农用地膜的厂，去年图便宜进了一批“PBS副牌”，吹膜时一拉就断、落地三个月不降解，最后经农业农村部门抽检才发现掺了大量PE母粒。老板亏钱又挨罚，教训就一条：PBS这种降解料，副牌翻车多半翻在“降解标签”和原料一致性上。国产PBS这条线，蓝山屯河是绕不开的一家。
PBS是什么，国产格局
PBS是聚丁二酸丁二醇酯，石油基全生物降解聚酯，刚性好、耐热比PBAT高，农用地膜、一次性餐具、包装、发泡里用。全球PBS早年由昭和电工等推动。国内这头，中科院理化所技术支撑下，杭州鑫富、山东汇盈、山西金晖兆隆先后产业化，而新疆蓝山屯河依托BDO—PBS全产业链，PBS树脂产能居国内前列，是国家制造业单项冠军，生物降解材料综合产能达数十万吨，BDO、PTMEG、PBT、PET协同配套。论PBS规模化和BDO一体化，蓝山屯河是国内这条线上绕不开的头部。下游看，农用地膜和一次性包装占PBS消费大头，发泡和一次性餐具是延伸方向。PBS因为耐热比PBAT高，常和PBAT共混做地膜和片材，西北和华东的地膜厂对国产PBS副牌接受度逐年提高，蓝山屯河的料在降解料圈子里流通量不小。
PBS副牌从哪来，和PBAT、掺PE怎么分
PBS副牌来自聚合装置开停车料、牌号切换过渡料、工艺波动致分子量或色相小幅偏离的批次。它仍是原厂原生PBS粒子，可降解骨架与正牌一致，个别指标小幅浮动，不是回料。要把PBS和PBAT分清：PBS刚、耐热高；PBAT韧、抗撕裂好，常共混用。更要警惕拿PE母粒掺进“PBS副牌”——PE不降解，吹膜断裂伸长和降解周期一测就露馅。PBS副牌按分子量和熔融指数分档，分子量直接影响力学和降解周期，吹膜前要测熔融指数和生物降解认证。副牌按分子量分档，分子量偏差直接影响力学和降解周期。
头部企业深度分述：蓝山屯河
蓝山屯河是新疆新投集团控股的化工新材料国企，在昌吉建有百万吨生物新材料产业园，BDO自供，PBS/PBAT生物降解材料一体化，TH801系列是其PBS代表牌号。它的特点是原料端BDO—PBS垂直整合，成本和批次一致性在国内这一档里经过长期市场验证，产品畅销海内外。其副牌多来自聚合开停车和牌号切换，分子量略低、色相略黄，但可降解骨架与正牌同体系。对一般农用地膜、非高端一次性包装、发泡料，副牌替代进口PBS的性价比明显。第二梯队里，山西金晖兆隆、山东汇盈新材料有PBS/PBAT产能，金发科技、万华等在降解聚酯方向布局，BDO一体化规模仍以蓝山屯河为代表，仅作行业背景。农用地膜客户最头疼的就是降解周期和力学的平衡，蓝山屯河把BDO—PBS垂直整合，批次分子量分布窄、熔指稳，下游吹膜厂拿来和PBAT共混时不用反复调配方，这是它在西北地膜市场站稳的原因。
PBS副牌选购避坑
第一，测熔融指数和生物降解认证，农用地膜要过堆肥降解标准，副牌每批核对降解周期。第二，辨掺PE，PE不降解，吹膜断裂伸长和埋土降解测试一测便知。第三，批次留样可溯，降解料批次差异大，每批留样。第四，干燥，PBS吸潮，吹膜前充分干燥。第五，对牌号，TH801系列按用途分，别拿通用级凑高耐热餐具级。另外PBS吹膜要和PBAT共混调柔韧，副牌按比例试配方，别单独硬吹。降解标签宣称要靠检测报告，副牌别直接做高要求认证降解制品。采购时还要把熔指和分子量的波动范围写进合同，地膜厚度和拉伸要求对这两项敏感，一批料偏粘偏脆都会让整卷膜报废。
科隆仓库现货
科隆仓库现货主推品牌：蓝山屯河TH801系列PBS生物降解聚酯副牌料。主要牌号：农用地膜、一次性餐具、包装、发泡用全降解专用料。包装规格：小包装与大包装（吨袋）均有备货。仓库现货通常在2000-5000吨，其中小包副牌备货300-600吨、箱装副牌备货150-300吨、大包料/吨袋备货1500-4100吨。供应保障：批次留样可溯，每批留样存档，出库附出厂检测数据，熔融指数、分子量、降解认证逐批对应。农用地膜、降解包装、餐具客户可报制品类型询价。
选型口诀与案例
国产PBS副牌选料三句话：降解认证先验，掺PE别当副，分子量每批测。
A factory in Lanzhou that makes fully degradable agricultural mulch last year bought a batch of "PBS sub-brand" cheaply. When blown away, it broke as soon as it was pulled and didn't degrade for three months. Eventually, a spot check by the agricultural and rural departments revealed a large amount of PE masterbatch was added. The boss lost money and got fined. The lesson is simple: PBS, a degradable material, often fails with sub-brand failures due to "degradability labels" and raw material consistency. In the domestic PBS line, Lanshan Tunhe is an unavoidable player. What is
PBS? The domestic
PBS is polybutanediol sbutoxide, petroleum-based fully biodegradable polyester, which has good rigidity and higher heat resistance than PBAT, used in agricultural mulch film, disposable tableware, packaging, and foaming. Global PBS was initially promoted by Showa Electric and others. Domestically, supported by the Institute of Physics and Chemistry, Chinese Academy of Sciences, Hangzhou Xinfu, Shandong Huiying, and Shanxi Jinhui Zhaolong have successively industrialized. Xinjiang's Lanshantunhe relies on the full BDO-PBS industry chain, ranking among the top in the country in PBS resin production capacity and is the national manufacturing champion. Its comprehensive biodegradable material capacity reaches hundreds of thousands of tons, with BDO, PTMEG, PBT, and PET coordinated production. In terms of PBS scale and BDO integration, Lanshantunhe is an unavoidable leader in this domestic market. Downstream, agricultural mulch and disposable packaging account for the majority of PBS consumption, while foaming and disposable tableware are the extension directions. PBS is heat-resistant compared to PBAT, often blended with PBAT to make mulch films and sheets. Manufacturers in Northwest and East China are increasingly accepting domestic PBS sub-brands, and Lanshantunhe's materials are widely circulated in the degradation material circle. Where does
PBS sub-brand come from, and how to distinguish between PBAT and PE-blended sub-brands
PBS Sub-brands come from start-stop materials in polymerization units, transition materials for grade switching, and batches where process fluctuations cause slight deviations in molecular weight or hue. They are still original original PBS particles, with a biodegradable framework consistent with genuine ones, with some indicators fluctuating slightly, not recycled material. PBS and PBAT must be distinguished: PBS is rigid and highly heat-resistant; PBAT is tough and tear-resistant, and is often mixed together. Be especially cautious of mixing PE masterbatch into "PBS sub-brand"—PE does not degrade, and the film break elongation and degradation period can be exposed immediately after testing. PBS sub-brands are classified by molecular weight and melt index; molecular weight directly affects the degradation cycle. Before film blowing, test melt index and biodegradability certification. Sub-brands are classified by molecular weight, with molecular weight deviations directly affecting degradation cycles.
In-depth Discussion of Leading Enterprises: Lanshantunhe
Lanshantunhe is a state-owned chemical new materials enterprise controlled by Xinjiang Xintou Group, with a million-ton bio-new materials industrial park in Changji, BDO self-supply, integrated PBS/PBAT biodegradable materials, and the TH801 series as its representative PBS grade. Its feature is vertical integration of BDO-PBS at the raw material end, with cost and batch consistency validated in the domestic market over a long period, and products sell well both domestically and internationally. Most sub-brands come from polymer start-stop and grade switching, with slightly lower molecular weight and slightly yellowish hue, but their biodegradable framework shares the same system as genuine brands. For general agricultural mulch film, non-high-end disposable packaging, and foam materials, sub-brands offer clear cost-performance as a substitute for imported PBS. In the second tier, Shanxi Jinhui Zhaolong and Shandong Huiying New Materials have PBS/PBAT capacity, while Kingfa Technology and Wanhua are expanding in degradable polyester. The BDO integration scale is still represented by Lanshantunhe, serving only as an industry background. The biggest headache for agricultural mulch customers is balancing degradation cycles and mechanics. Lanshantunhe vertically integrates BDO-PBS, resulting in narrow batch molecular weight distribution and stable melting fingers. When downstream blown film factories mix with PBAT, they do not need to repeatedly adjust formulas, which is why they have established a solid position in the northwest mulch market.
PBS sub-brand selection pitfalls
First, measure melt index and biodegradability certification; agricultural mulch must meet composting degradation standards, and sub-brands verify degradation cycles for each batch. Second, distinguish between PE doping; PE does not degrade; film break elongation and soil degradation tests can be determined in one measure. Third, batch samples are traceable; degradable material varies greatly by batch, so samples are retained per batch. Fourth, drying: PBS absorbs moisture and is thoroughly dried before film blowing. Fifth, regarding grade, the TH801 series is classified by use; do not use general-purpose grades to increase heat-resistant tableware grade. Additionally, PBS film blowing should be blended with PBAT for flexibility; sub-brands should test formulations according to proportional ratios, not forced blowing alone. Degradation labels must rely on test reports; sub-brands should not directly certify degradable products with high standards. When purchasing, the melting index and molecular weight fluctuation range should be written in the contract. Plastic film thickness and tensile requirements are sensitive to these two factors; a batch that is too sticky or brittle will cause the entire film roll to be scrapped.
Cologne Warehouse In-Stock
Cologne Warehouse In-Stock Main Recommended Brand: Lanshan Tunhe TH801 Series PBS Biodegradable Polyester Sub-brand Material. Main Grades: Agricultural mulch film, disposable tableware, packaging, fully degradable specialized material for foaming. Packaging Specifications: Both small and large packages (per ton bags) are stocked. Warehouse stock is usually between 2000-5000 tons, with small sub-brand stocks at 300-600 tons, boxed sub-brands at 150-300 tons, and large packages/ton bags at 1500-4100 tons. Supply guarantee: Batch samples are traceable, each batch is archived, factory inspection data is attached after shipment, melt index, molecular weight, and degradation certification are matched for each batch. Agricultural mulch film, degradable packaging, and tableware customers can request product type quotes.
Selection Mnemonics and Case Studies
Domestic PBS Sub-brand Material Selection Three Sentences: Degradation certification first, PE blending not as backup, molecular weight measured per batch
