反常识说一个事：很多人以为PBT副牌和ABS副牌、PC副牌是一回事，都是"原厂正牌差点指标"。但真做改性的都知道，PBT副牌的门道比想象中多——特性粘度差0.05，打出来的连接器强度就差一截；端羧基含量高一点，耐热老化就差一截。PBT这东西，副牌不是不能用，是得挑着用。
今天就把中石化仪征化纤、江阴和时利、新疆蓝山屯河这三家国内PBT头部企业的副牌门道，一次讲透。
PBT是什么？国内产能格局
PBT是聚对苯二甲酸丁二醇酯，结晶速度快、成型周期短、耐化学、电绝缘好，大量用于电子电器连接器、汽车传感器部件、灯具反射杯、纤维、拉链齿等领域。PBT是改性塑料的常用基材，玻纤增强PBT更是电子电器领域的主力材料。
国内PBT产能主要集中在中石化仪征化纤、新疆蓝山屯河、江阴和时利等企业。仪征化纤依托中石化PTA和BDO资源一体化，成本控制能力强；蓝山屯河依托新疆煤炭资源发展BDO—PBT一体化，原料自给率高；江阴和时利是民营PBT专业厂，采用PTA连续法工艺。此外，山西三维、南通星辰等也是PBT重要产能方。
PBT副牌：特性粘度和端羧基含量是两个硬指标
PBT副牌，是原厂同一牌号体系里检验指标小幅偏离的批次。落到PBT上，副牌最常见的差异点集中在三项：特性粘度波动、端羧基含量偏高、色相偏差。
为什么这三项关键？PBT的核心指标就是特性粘度（分子量的表征）。粘度波动大，改性后的强度和韧性就跟着波动。端羧基含量高，则表示聚酯降解倾向大，耐热老化性能下降。色相偏差则影响浅色制品的外观。
和回料的区别再说一遍：PBT回料是连接器、拉链等制品破碎再造粒，分子量已经降解过一次，粘度明显下降；PBT副牌是原厂原生切片，只是个别指标小幅偏离。做电子连接器，用副牌是"粘度够不够"的问题，用回料是"能不能通过安规"的问题。
中石化仪征化纤：PBT国内老牌主力
中石化仪征化纤是国内PBT老牌生产企业，依托中石化上游PTA和BDO资源一体化，具备较强的成本控制能力，PBT年产能在国内排在前列。其产品覆盖树脂级、纤维级、薄膜级多个方向，在电子电器、汽车领域有稳定客户。
代表牌号方面，仪征化纤PBT以注塑级和改性基料级为主。其副牌料的特点是：中石化体系批次管理规范，粘度波动相对可控；注塑级副牌适合电子电器结构件、汽车传感器部件等对粘度要求不极端的制品；改性基料级副牌适合改性厂掺混使用。
适用场景：电子电器连接器、汽车传感器部件、灯具反射杯、改性基料掺混、拉链齿。
江阴和时利：民营PBT专业厂
江阴和时利是民营PBT专业生产企业，PBT年产能约7万吨，采用PTA连续法自有技术工艺生产。其PBT产品特点是特性粘度波动范围窄、端羧基含量低、产品色泽好，在行业内有一定口碑。
代表牌号方面，和时利PBT以注塑级为主，商品名"和时利PBT"。其副牌料的特点是：产品品质在民营PBT里排在前列，粘度控制精细；华东区域供应距离近，适合长三角改性厂和注塑厂就近采购；副牌批次管理规范。
适用场景：电子电器连接器、汽车部件、纤维、拉链齿、改性基料。
新疆蓝山屯河：BDO-PBT一体化龙头
新疆蓝山屯河是国内PBT头部生产企业，依托新疆丰富的煤炭资源发展BDO—PBT一体化产业链，自产BDO供应比例高，成本优势突出。其PBT年产能规模在国内排在前列，产品覆盖树脂级和纤维级。
代表牌号方面，蓝山屯河PBT以注塑级和纤维级为主。其副牌料的特点是：一体化生产导致成本优势明显，副牌价格竞争力强；但新疆到华东的运输距离长，交货周期和运费需要考虑；注塑级副牌适合对成本敏感、批量大的通用制品。
适用场景：电子电器外壳、汽车内饰件、纤维、拉链齿、日用制品、改性基料。
PBT副牌避坑指南
第一，特性粘度必须和产品匹配。PBT副牌粘度波动比正牌大，改性厂选副牌时要先确认自己配方需要的粘度区间，别拿高粘度副牌去打需要流动性的薄壁连接器。
第二，端羧基含量必须测。PBT副牌如果端羧基含量偏高，耐热老化性能下降，做汽车发动机舱周边件要特别注意。
第三，安规认证件别用副牌。电子连接器有安规认证要求的，必须用正牌，别拿副牌赌。
第四，注意运输距离。蓝山屯河产能在新疆，到华东运费不低；仪征化纤在江苏，和时利在江阴，华东客户就近采购更划算。
科隆仓库现货｜国产PBT牌号混搭
科隆在宁波仓库常备国产PBT副牌现货，主推品牌覆盖中石化仪征化纤、江阴和时利、新疆蓝山屯河三家国内头部企业。主要牌号涵盖注塑级、改性基料级、纤维级多个常用型号，包装分大包装与小包装两种，不同牌号混搭备货。
仓库现货通常在4000吨上下：小包副牌备货600-900吨，箱装副牌备货250-450吨，大包料/吨包料备货2650-3150吨。
供应保障走检测单随货：每批PBT副牌料附原厂检测单，特性粘度、端羧基含量、色相三项关键指标随货同行；批次留样可追溯，来料验收有据可查。
选型口诀与案例
国产PBT副牌怎么选？记住四句话：粘度匹配是前提，端羧基必须测，安规件别碰副牌，就近采购省运费。
南京一家做电子连接器的改性厂，此前一直用某进口PBT正牌做基料，每吨成本偏高。今年改用科隆供的江阴和时利PBT副牌注塑级，先拿两吨小样做改性测试，特性粘度和端羧基含量都在配方接受范围内，批量切料后改性料做连接器装机通过安规抽检，每吨原料成本降了近一千八百元。厂长说：做改性基料掺混，副牌粘度够，为什么要花正牌的钱？
Counterintuitive Something to Say: Many people think PBT secondary cards, ABS secondary cards, and PC secondary brands are the same thing—both are 'genuine factory short-term indicators.' But anyone who actually modifies them knows that PBT secondary brands have more tricks than you might think—if the characteristic viscosity is 0.05 different, the connector strength is a notch lower; If the carboxyl content at the end is higher, the resistance to heat aging is a notch worse. PBT isn't that secondary brands can't be used—you have to choose and use them.
Today, I'll thoroughly explain the sub-label principles of Sinopec Yizheng Chemical Fiber, Jiangyin Heshili, and Xinjiang Lanshan Tunhe—three leading domestic PBT companies. What is
PBT? The domestic capacity structure
PBT polybutylene terephthalate, which has fast crystallization, short molding cycles, chemical resistance, and good electrical insulation. It is widely used in electronic and electrical connectors, automotive sensor components, lamp reflector cups, fibers, zipper teeth, and other fields. PBT is a commonly used substrate for modified plastics, and fiberglass-reinforced PBT is the main material in the electronics and electrical appliance sector.
Domestic PBT capacity is mainly concentrated in Sinopec Yizheng Chemical Fiber, Xinjiang Lanshan Tunhe, Jiangyin Heshili, and other enterprises. Yizheng Chemical Fiber relies on Sinopec PTA and BDO resource integration, with strong cost control capabilities; Lanshantunhe leverages Xinjiang's coal resources to develop BDO-PBT integration, with a high raw material self-sufficiency rate; Jiangyin Heshili is a private PBT specialty factory using PTA continuous process. In addition, Shanxi Sanwei and Nantong Xingchen are also important producers of PBT.
PBT sub-brand: Intrinsic viscosity and end carboxyl content are two hard indicators
PBT sub-brand, and are batches with slight deviations in inspection indicators within the same original brand's system. For PBT, the most common differences in secondary brands are three: fluctuation in intrinsic viscosity, high end carboxyl content, and hue deviation.
Why are these three key? The core indicator of PBT is intrinsic viscosity (representing molecular weight). Large fluctuations in viscosity lead to changes in modified strength and toughness. High end carboxyl content indicates a strong tendency for polyester to degrade, resulting in reduced heat aging resistance. Hue deviation affects the appearance of light-colored products.
Again, the difference between recycled material and recycled materials: PBT recycled material is the crushing and regranulation of connectors, zippers, and other products, with molecular weight already degraded once, resulting in a significant decrease in viscosity; PBT secondary brands are original factory chips, with only slight deviations in certain indicators. For electronic connectors, using secondary brands is a matter of "viscosity is sufficient," while recycled materials are a matter of "whether they can meet safety standards."
Sinopec Yizheng Chemical Fiber: A long-established domestic main player in PBT
Sinopec Yizheng Chemical Fiber is a long-established PBT producer in China, relying on Sinopec's integrated upstream PTA and BDO resources, possessing strong cost control capabilities. Its annual PBT production capacity ranks among the top in China. Its products cover resin grade, fiber grade, and film grade, with stable customers in the electronics, electrical, and automotive sectors. In terms of
representative grades, Yizheng Chemical Fiber PBT mainly uses injection molding grade and modified base material grade. The characteristics of its sub-brand material are: standardized batch management within the Sinopec system, with relatively controllable viscosity fluctuations; Injection-molded sub-brand is suitable for electronic and electrical structural parts, automotive sensor components, and other products with less extreme viscosity requirements; Modified base material sub-brand is suitable for blending in modification factories.
Applicable scenarios: electronic and electrical connectors, automotive sensor components, lamp reflector cups, modified base material blending, zipper teeth.
Jiangyin Heshili: Private PBT Specialty Factory
Jiangyin Heshili is a private PBT professional manufacturer with an annual PBT production capacity of about 70,000 tons, producing using PTA continuous technology and technology. Its PBT products feature a narrow range of viscosity fluctuation, low carboxyl content at the end, and good product color, earning a certain reputation in the industry. In terms of
representative grades, Heshili PBT mainly uses injection-molded grade, with the brand name "Heshili PBT." The characteristics of its sub-brand materials are: product quality ranks among the top among private PBTs, with precise viscosity control; Supply distance in East China is close, suitable for Yangtze River Delta modification and injection molding factories to purchase nearby; Sub-brand batch management is standardized.
Applicable scenarios: electronic and electrical connectors, automotive parts, fibers, zipper teeth, modified base materials.
Xinjiang Lanshan Tunhe: Leading BDO-PBT integration
Xinjiang Lanshan Tunhe is a leading domestic PBT producer, leveraging Xinjiang's abundant coal resources to develop the BDO-PBT integrated industrial chain, with a high proportion of self-produced BDO supply and outstanding cost advantages. Its annual PBT production capacity ranks among the top in China, with products covering resin and fiber grades.
In terms of representative grades, Lanshan Tunhe PBT mainly focuses on injection-molded and fiber grades. Its sub-brand material is characterized by obvious cost advantages due to integrated production and strong price competitiveness for sub-brands; However, the transportation distance from Xinjiang to East China is long, so delivery times and freight costs need to be considered; Injection-molded sub-brands are suitable for cost-sensitive and large-batch general products.
Applicable scenarios: electronic and electrical housings, automotive interior parts, fibers, zipper teeth, daily products, modified base materials.
PBT secondary brand pitfall guide
First, the characteristic viscosity must match the product. PBT secondary brands have greater viscosity fluctuations than genuine ones. When selecting secondary brands, modified manufacturers should first confirm the viscosity range required for their formula and avoid using high-viscosity secondary brands to use thin-walled connectors that require flow.
Second, the end carboxyl content must be measured. If the PBT secondary brand has high end carboxyl content, its heat aging resistance decreases, so special attention should be paid when making automotive engine compartment peripheral parts.
Third, do not use secondary brands for safety certification parts. For electronic connectors with safety certification requirements, use genuine brands; do not gamble with secondary brands.
Fourth, pay attention to transportation distance. Lanshantunhe's production capacity is in Xinjiang, with high shipping costs to East China; Yizheng Chemical Fiber is in Jiangsu, Heshili in Jiangyin, so purchasing nearby is more cost-effective for East China customers.
Cologne Warehouse Stock | Mixed Domestic PBT Grades
Cologne maintains domestic PBT sub-brand stock at the Ningbo warehouse, with main brands covering three leading domestic companies: Sinopec Yizheng Chemical Fiber, Jiangyin Heshili, and Xinjiang Lanshantunhe. Main grades include injection-molded grade, modified base grade, and fiber grade, with packaging in large and small packages, mixed and stocked by different grades.
Warehouse stock is usually around 4000 tons: small sub-brand stock is 600-900 tons, boxed sub-brand stock is 250-450 tons, and large bulk sub-brand is 2650-3150 tons.
Supply guarantee with inspection orders: Each batch of PBT sub-brand material comes with the original factory test sheet, with three key indicators—characteristic viscosity, end carboxyl content, and hue—carried with the goods; Batch retained samples are traceable, and incoming material acceptance is verifiable.
Selection Mnemonics and Case Studies
How to choose domestic PBT sub-brand? Remember these four points: viscosity matching is the prerequisite, end-carboxyl must be tested, safety parts should not touch sub-brand, and purchasing nearby saves shipping.
A modified factory in Nanjing specializing in electronic connectors previously used a certain imported genuine PBT brand as the base material, which had a relatively high cost per ton. This year, they switched to using the Jiangyin Heshili PBT secondary brand injection grade supplied by Kelong. They first took two tons of samples for modification testing, and both the intrinsic viscosity and end carboxyl content were within the acceptable range of the formula. After batch cutting, the modified material was installed as a connector and passed safety inspections, reducing the cost per ton of raw material by nearly 1,800 yuan. The factory director said: When mixing modified base materials, the secondary brand has sufficient viscosity, so why spend money on the genuine brand?
