Overview
Plastic desiccants are essential additives in polymer processing, preventing moisture-related defects like bubbles or brittleness. They are commonly used in thermoplastic manufacturing, where even small amounts of water can degrade material properties during high-temperature processing. These desiccants work by physically or chemically bonding with water molecules trapped in plastic pellets. Unlike food-grade desiccants, plastic-specific formulations are optimized for high temperatures and compatibility with industrial polymer chemistry.
Physical and Chemical Properties
Most plastic desiccants are porous materials with large surface areas for moisture adsorption. Silica gel is widely used for its stability up to 220°C, while molecular sieves offer superior performance in very low humidity environments. The adsorption capacity typically ranges from 20-40% of the desiccant's weight. Some advanced formulations incorporate indicators (like cobalt chloride) that change color when saturated. Chemically, these materials are designed to be inert to prevent reactions with plasticizers or other additives.
Main Applications
Primary use is in pre-processing drying of hygroscopic plastics such as PET, PC, ABS, and nylon. These materials absorb moisture from ambient air, which must be removed before injection molding, blow molding, or extrusion. In packaging applications, desiccant bags are placed with moisture-sensitive plastic products during shipping. Some specialty desiccants are compounded directly into masterbatches for continuous moisture control during the product lifecycle.
Safety and Storage
While generally safe, some desiccants may release trace volatiles when heated above their rated temperatures. Proper ventilation is recommended in drying hoppers. Spent desiccants should be disposed according to local regulations, though many types can be regenerated by heating. Storage requires airtight containers to prevent premature saturation. Industrial users should monitor humidity indicators and replace desiccants when efficiency drops below 70% of initial capacity. Bulk storage areas should maintain relative humidity below 50%.
B2B Procurement Guide
Industrial buyers should evaluate moisture absorption rate (typically 1-3% per hour), maximum operating temperature, and reactivation cycles. For continuous operations, automated drying systems with integrated desiccant may be more cost-effective than manual replacement. Consider total cost of ownership including regeneration energy requirements. Technical specifications should include dew point performance (-40°C or lower for critical applications) and particulate generation rates to avoid contamination. Sample testing with actual production materials is strongly recommended.
Related Manufacturers
- 主营：v型混合机、一维混合机、二维混合机、电热鼓风干燥箱、真空干燥箱、真空干燥机、脉冲式平板真空干燥箱、平板真空干燥箱、三维混合机、槽型混合机、螺带混合机、双锥混合机、方锥混合机、真空上料机、臭氧发生器、对开门洁净烘箱、灭菌烘箱、热风循环烘箱、包衣机、实验室三维混合机、运动混合机
- 主营：烘干机、撕碎机、洗羊机、塑料颗粒烘干机、制砂机、筛选设备、粉土机、移动破碎机、连续式烘干机、颚式破碎机、锤式破碎机、车载式破碎机、履带式破碎机
- 主营：热风循环烘箱、高温烘箱、工业烘箱、真空干燥箱、鼓风干燥箱、混合机、三维混合机、V型混合机、二维混合机、双锥混合机、槽型混合机、摇摆混料机、工业电炉、三维混料机、不锈钢储罐
- 主营：三维混合机、实验室专用混合机、方锥混合机、真空干燥机、真空干燥箱、平板真空干燥箱、电热鼓风干燥箱、运动混合机、双锥混合机、二维混合机、实验室三维混合机、热风循环烘箱、臭氧发生器、螺带混合机、一维混合机、包衣机、真空上料机、槽型混合机、v型混合机
- 主营：热风循环烘箱、振动流化床、水膜除尘器、干燥机、干燥设备、带式干燥机、单锥螺带干燥机、空心桨叶干燥机、盘式干燥机、喷雾干燥机、双锥回转干燥机、旋转闪蒸干燥机、圆盘干燥机、真空耙式干燥机、方形真空干燥机、耙式干燥机、真空干燥机、超微粉碎机、V型混合机
- 主营：热风循环烘箱、沸腾制粒机、湿法制粒机、真空干燥机、喷雾干燥机、闪蒸干燥机、振动流化床干燥机、真空盘式干燥机、真空耙式干燥机、空心桨叶干燥机、高速混合干燥机、滚筒刮板干燥机、单锥螺旋真空干燥机、沸腾干燥机、旋转闪蒸干燥机、桨叶干燥机、摇摆颗粒机、犁刀混合机、双锥混合机、二维运动混合机、三维运动混合机、V型混合机
- 主营：热风循环烘箱、振动流化床、摇摆颗粒机、干燥机、耙式真空干燥机、方型真空干燥机、双锥回转真空干燥机、圆形真空干燥机、滚筒干燥机、滚筒刮板干燥机、桨叶干燥机、振动流化床干燥机、闪蒸干燥机、喷雾干燥机、单锥真空干燥机、沸腾干燥机、热风旋转烘箱、真空陶瓷过滤机
- 主营：流化床制粒包衣机、热风循环烘箱、槽形混合机、真空耙式干燥机、单锥螺带真空干燥机、闪蒸干燥机、喷雾干燥机、振动流化床干燥机、脉冲真空干燥机、滚筒刮板干燥机、双锥回转真空干燥机、制粒包衣干燥机、高速离心喷雾干燥机、冷凝造粒喷雾干燥机、气流喷雾干燥机、压力式喷雾干燥机、中药浸膏喷雾干燥机、沸腾干燥机、旋转闪蒸干燥机、双轴圆盘真空干燥机、双螺旋锥形混合机、二维运动混合机、方型混合机、双锥混合机、卧式螺带混合机
- 主营：氦气、液氦、六氟化硫、液氮、食品氮气、氩气、液氩暂无推荐商品
- 主营：PVC阻燃电缆护套料、涂塑丝网料、低烟无卤阻燃电缆料、塑料粒料、PVC电缆料、PVC绝缘电缆料、PVC护套电缆料、PVC阻燃电缆料
- 主营：陶瓷鲍尔环、金属四氟鲍尔环、陶瓷四氟拉西环、塑料鲍尔环、塑料四氟拉西环、塑料阶梯环、塑料异鞍环、金属四氟拉西环、陶瓷阶梯环、金属阶梯环、陶瓷矩鞍环、陶瓷异鞍环、规整填料、丝网除沫器、分布器
- 主营：乙二醇、助溶剂、平平加、塑料桶、渗透剂、油酸酯、粘接剂、添加剂、柔软剂、润湿剂、赋形剂、匀染剂、消泡剂、乳化剂、铸模剂、保湿剂、混凝土、涂饰剂、稳定剂、分散剂、金属加工、月桂酸酯、抗静电剂、无规聚醚、十二十四
- 主营：环保abs、黄色粉、蓝色pet、塑料abs、色颜料、拉丝eva、绿色tpu、荧光粉、绿颜料、pla塑胶、pet珠光、pet吹瓶、蜡色粉、兰色母、abs母料、蓝色tpu、专用pvc、tpu无卤、无纺布、色纺纱、abs注塑、tpu增韧、pet高光、发泡eva、半成品
- 主营：隧道烘箱、电机烘箱、台车烘箱、电子干燥箱、电镀烘箱、去氢烘箱、高温烘箱、橡胶烘箱、二次硫化烘箱、汽车零部件烘箱、油桶烘箱、环氧树脂预热烘箱、实验室烘箱、特氟龙烧结炉、旋转烘箱、热缩套管收缩烘箱
- 主营：弹性体软胶粉碎机、橡胶颗粒粉碎机、低温粉碎机、塑料粉碎机、粉碎纤维分离机、硬盘撕碎机、碎卡机、薄膜边料机静音粉碎机、工业冷水机冷风机、橡胶粉碎机、碎胶机、粉碎机、粉碎分选机、废品硅胶橡胶、顺丁橡胶颗粒粉碎机、三元已丙橡胶粉碎机、硫化橡胶粉碎机、积木粉碎筛选机、丁晴块橡胶粉碎机、聚异丁烯橡胶粉碎机、SBS橡胶粉碎机、丁苯橡胶破碎机、PVC型材输送、复合材料输送、三元乙丙胶粉碎机