Zinc Stearate ZNS Zinc distearate CAS 557-05-1

Tree Chem manufactures high-purity Potassium Nitrate (CAS 7757-79-1) with advanced crystallization and refining technology to ensure precise composition and stable quality. As a professional factory, we produce KNO₃ in multiple physical forms—powder, prills, and granules—suitable for analytical, food, and industrial-grade use. Our product offers excellent solubility, fine particle uniformity, and low chloride levels, making it ideal for precision agriculture, energy storage systems, and specialty chemical synthesis.

Tree Chem maintains long-term cooperation with multiple international distributors to provide consistent global supply and technical support. For specification details, sample requests, or to order high-purity KNO₃ in bulk, please contact info@cntreechem.com.

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기술 사양

Tree Chem’s zinc stearate is widely used across industries such as plastics, rubber, coatings, inks, cosmetics, pharmaceuticals, textiles, paper, and construction materials. Our customers apply it as a heat stabilizer, lubricant, mold release agent, vulcanization aid, emulsifier, and thickener. With consistent quality and proven application experience, Tree Chem has become a trusted partner for clients in multiple industries.

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Plastics Industry

• In the plastics industry, one of the most important applications of zinc stearate is as a heat stabilizer for PVC resins. During processing and use, PVC tends to undergo thermal decomposition, releasing hydrogen chloride (HCl), which causes discoloration and deterioration of mechanical properties. Zinc stearate can absorb the HCl released from PVC and replace active chlorine atoms, thereby achieving thermal stabilization. However, when used alone, the resulting zinc chloride can catalyze further dehydrochlorination; therefore, zinc stearate is typically used together with calcium soaps to form a calcium-zinc stabilizer system.
• Zinc stearate also exhibits excellent lubricating properties and is widely used as a lubricant and mold release agent during plastic processing. It forms a lubricating film between the polymer and processing equipment, reducing friction and wear while improving productivity. By lowering polymer melt viscosity and enhancing flowability, it facilitates molding and extrusion. Zinc stearate also prevents adhesion by forming a uniform surface film, which reduces demolding time and improves production efficiency. In PVC processing, it serves as both an internal and external lubricant, preventing material from sticking to molds during extrusion and calendering. It is also used as a lubricant in wood-plastic composites.
• In the processing of polyethylene (PE) and polypropylene (PP), zinc stearate acts as both a lubricant and dispersant, reducing melt viscosity, enhancing flow, and improving additive dispersion such as pigments and fillers. This results in better product appearance and performance. In polycarbonate (PC) and nylon (PA) engineering plastics, zinc stearate functions as a lubricant and mold release agent to enhance processing efficiency and surface quality.
• For polystyrene (PS) systems, zinc stearate is the main lubricant and mold release agent. It reduces melt viscosity, improves flowability, and prevents PS products from sticking to molds. In expanded PS production, zinc stearate acts as a foaming aid, helping control cell structure and density.
• In PE and PP, zinc stearate can also act as a catalyst neutralizer, as it is often added to neutralize residual catalysts from polymerization. In PP fiber manufacturing, zinc stearate enhances tensile strength and abrasion resistance while reducing fiber breakage.
• In engineering plastics such as PA, PC, and POM, zinc stearate improves processing by providing lubrication and easy demolding, especially at high processing temperatures and viscosities. In PA fiber production, it enhances strength and abrasion resistance, while in PC injection molding, it helps reduce surface defects and improves product appearance.
• In thermosetting plastics such as phenolic and amino resins, zinc stearate is used as a lubricant and release agent, improving molding performance and preventing sticking between the molded product and the mold, ensuring smooth surface finishes.
• For specialty plastics such as fluoroplastics and PEEK, zinc stearate also plays a vital role in lubrication and release, which are crucial for maintaining quality and improving efficiency in high-cost, high-temperature processes.

Rubber Industry

• In the rubber industry, zinc stearate plays a critical role as a vulcanization activator and promoter. Vulcanization is a complex chemical process that requires zinc oxide, stearic acid, accelerators, and sulfur. Zinc stearate is widely used in both natural rubber (NR) and synthetic rubbers such as SBR, BR, EPDM, and NBR.
• It significantly improves the mechanical properties of vulcanized rubber by catalyzing cross-linking reactions, thereby enhancing hardness, tensile strength, and wear resistance. Zinc stearate also affects vulcanization characteristics, shortening curing time and improving efficiency. Studies show that replacing part of zinc oxide and stearic acid with zinc stearate can increase crosslink density and improve heat and aging resistance.
• During mixing, zinc stearate acts as an internal lubricant, reducing friction between rubber and equipment, thereby increasing processing efficiency. Its low melting point (120 ± 5°C) allows it to melt quickly during mixing, forming a stable lubricating film that reduces torque and prevents sticking.
• Zinc stearate also influences aging properties—moderate amounts enhance heat-aging resistance, though excessive addition may have negative effects. It further improves electrical insulation and chemical resistance, which are essential in specialized rubber applications.
• Typically, zinc stearate is added at 0.5%–2.0% of the total rubber weight, depending on formulation and process requirements. Overuse should be avoided as it may negatively impact mechanical performance.

Coatings Industry

• In the coatings industry, zinc stearate is an important drier, matting agent, and anti-settling agent. It accelerates the oxidative polymerization of drying oils in coatings, thereby reducing drying time.
• In solvent-based coatings, zinc stearate offers excellent solubility and dispersion. It serves as a grinding additive suitable for alkyd, nitrocellulose, polyurethane, polyester, epoxy, and acrylic coatings. In these systems, it improves flow leveling and gloss while providing matting and anti-settling effects.
• In water-based industrial and wood coatings, waterborne zinc stearate enhances surface smoothness and prevents softening or clogging of sandpaper during mechanical polishing. It also imparts a pleasant hand feel and improves water resistance in high-PVC coatings.
• In powder coatings, zinc stearate acts as both a flow modifier and anti-caking agent. Studies indicate that its addition can increase spray coating pass rates by up to 25%, improving powder flowability, storage stability, and coating quality. In coil coatings, it enhances metal adhesion and salt spray resistance by forming a protective film on metal substrates, improving corrosion protection and bonding.
• In specialty coatings such as fire-retardant, conductive, and high-temperature paints, zinc stearate provides tailored benefits—enhancing rheological stability in fireproof coatings and improving filler dispersion and conductivity in conductive coatings.

Cosmetics Industry

• In the cosmetics industry, zinc stearate serves multiple functions, primarily as an emulsifier and thickener, due to its unique molecular structure and physicochemical properties.
• As an emulsifier and stabilizer, it helps blend oil and water phases to form stable emulsions or creams, improving product texture and consistency. As a thickener, it increases viscosity and enhances the rheological properties of cosmetic and pharmaceutical creams. It is also used as an opacifier and in face powders.
• Zinc stearate is an essential component of powder cosmetics such as pressed powders, loose powders, eyeshadows, and blushes. As a binder, it increases powder adhesion to the skin, making makeup more long-lasting. Its silky texture and mild hygroscopicity allow even, smooth coverage.
• It also improves texture, making products finer and easier to apply. Thanks to its oil-absorbing and moisture-controlling properties, zinc stearate helps reduce shine and set makeup—ideal for oily skin types.
• Zinc stearate provides mild UV protection by reflecting and scattering ultraviolet rays, often in combination with other sunscreens. In skincare products, it acts as a moisturizing, soothing, and sebum-regulating agent. Its mild antimicrobial properties make it useful as a preservative in cosmetics and pharmaceuticals. In creams and lotions, it functions as a stabilizer to improve consistency and shelf stability.

Pharmaceutical Industry

• In the pharmaceutical field, zinc stearate is mainly used as an excipient and lubricant in tablet and capsule formulations, typically up to 1.5% (w/w). It reduces friction during compression, aiding tablet release and ensuring uniformity.
• In ointments and suppositories, zinc stearate serves as a base modifier. In ointments, it increases viscosity, improves spreadability and adhesion, and enhances stability by limiting water penetration. In suppositories, it reduces friction with molds, facilitates smooth demolding, and improves surface finish.

Other Applications

• Beyond these industries, zinc stearate also finds applications in textiles, paper manufacturing, and printing inks, where it functions as a lubricant, anti-static agent, and dispersant to improve processability and product performance.

보관 및 취급

• Store in a cool, dry, and well-ventilated area.
• Keep containers tightly closed and away from moisture.
• Avoid direct exposure to high temperature and strong acids.

사용 공지

• Avoid inhalation of fine powder during processing.
• Use standard protective measures (gloves, dust masks, eye protection).
• Not suitable for applications requiring solubility in water or alcohol.
• Dosage and Application Control: The dosage of zinc stearate is determined based on polymer type, processing method, and product requirements. In PVC processing: 0.5%–2%; in PE and PP processing: 0.2%–1%; in engineering plastics: 0.5%–2%. Proper control of dosage ensures optimal lubrication, stabilization, and dispersion without affecting appearance or mechanical properties.
• Wood Coatings: Zinc stearate provides an excellent matting effect in wood coatings. It improves sandability, enhances primer thixotropy and anti-settling properties, and increases filling and anti-yellowing performance. In NC coatings: 0.1%–0.5%; excessive dosage may reduce adhesion and transparency. In PE coatings: 2%–5%; overuse may cause whitening or reduce adhesion and clarity.
• Anti-Settling Function: When used as an anti-settling agent, zinc stearate is typically added at 0.2%–1% of total paint weight. It adjusts coating rheology, prevents pigment and filler sedimentation, and improves storage stability.
• Pressed Powder Formulation: In pressed powders, zinc stearate improves compacting performance, adhesion, and wear resistance. Recommended dosage: 5%–10%.
• Loose Powder Formulation: In loose powder cosmetics, zinc stearate provides setting, oil-control, and shine-reduction effects. It helps the product adhere evenly to the skin and extends makeup longevity.

포장

• 20 kg / 25 kg woven bag with inner PE liner
• Customized packaging available upon request