Silicone Sealant Vacuum Planetary Mixer for High-Viscosity Materials SXJ-15

The SXJ-15 Silicone Sealant Vacuum Planetary Mixer is a 15-liter tabletop unit engineered for high-viscosity mixing applications across silicone sealant, adhesive, cosmetic cream, and food paste production. As a vacuum planetary mixer, this model combines dual-axis planetary motion with high-speed dispersion and vacuum deaeration in a compact, laboratory-friendly footprint . The SXJ-15 is part of Maxwell's laboratory series (0.5-40L capacity range), offering electric lifting and the ability to handle materials with viscosities from 5,000 to 1,000,000 cps .

This 15L vacuum planetary mixer is specifically designed for processing high-solid-content, high-viscosity formulations that require thorough mixing, degassing, and temperature control. The dual mixing action—combining slow-speed kneading with high-speed dispersion—ensures complete incorporation of powders into liquids while eliminating dead zones through continuous wall scraping . The vacuum system achieves -0.09 MPa, removing entrapped air that could compromise product quality. The optional presser (extruder) attachment enables direct discharge of finished high-viscosity products from the mixing container, streamlining workflow from mixing to packaging.

Working Principle

The Vacuum Planetary Mixer operates on a compound motion principle that delivers exceptional mixing efficiency. The planetary gear system drives multiple agitators—typically two low-speed mixing blades and one high-speed disperser—to revolve around the central axis of the mixing vessel while simultaneously rotating on their own axes . This dual motion creates complex flow patterns that continuously renew shear zones throughout the material, ensuring every particle is subjected to intensive mixing forces.

During operation, the low-speed mixing blades rotate at 0-99 rpm (self-rotation) while orbiting at 0-43 rpm (revolution), generating powerful kneading and folding actions that circulate materials from the bottom to the top and from the center to the wall . Simultaneously, the high-speed disperser operates at up to 2,980 rpm, applying intense shear forces that break down agglomerates and ensure thorough powder-liquid wetting. A PTFE scraper blade mounted on the planetary frame continuously sweeps the vessel wall, preventing material buildup and eliminating mixing dead zones .

The vacuum system, capable of achieving -0.09 MPa, serves multiple critical functions. It removes entrapped air during mixing, eliminating bubbles that could compromise product quality and structural integrity. This degassing capability is especially vital for silicone sealants, where bubbles weaken adhesion and sealing performance, and for adhesives, where voids can compromise bond strength . The vacuum also facilitates material transfer and can be used for powder suction, minimizing dust and contamination. The sealed vessel design supports both vacuum and pressure operations, with the vessel jacket enabling precise temperature control through circulation of heating or cooling media (water, oil, or steam) .

Key Features

High-Viscosity Processing Capability: The SXJ-15 handles viscosities up to 1,000,000 cps and solid contents up to 90%, making it suitable for silicone sealants, structural adhesives, high-solid-content food pastes, and cosmetic creams . The powerful gearbox and motor system deliver consistent torque even under heavy loads.

Advanced Mixing Geometry: Clearances between mixing blades, blade-to-wall, and blade-to-bottom are precision-machined to optimize mixing efficiency. The PTFE scraper maintains continuous wall cleaning, ensuring complete material turnover and consistent batch quality .

Versatile Agitator Configurations: Various mixing head combinations are available, including twist impellers, dispersing discs, homogenizers, and scrapers. These can be tailored to specific applications such as silicone rubber, solder paste, ointments, or food pastes .

Vacuum and Temperature Control: The vacuum system achieves -0.09 MPa. The jacketed vessel supports electric, steam, or water circulation heating/cooling, with temperature monitoring ensuring process accuracy .

Electric Lifting System: The 0.5-30L models feature electric lifting, simplifying loading, sampling, and cleaning operations .

Optional Presser: The hydraulic press machine serves as supporting equipment for discharging or separating high-viscosity materials produced by the mixer, enabling integrated mixing and pressing .

Model Classification

The Vacuum Planetary Mixer series is organized into three primary categories to serve different production scales:

Laboratory Series (0.5-40L): Tabletop units ideal for R&D, pilot production, and small-batch manufacturing. Features include electric lifting, vacuum capability, and optional explosion-proof or special coating configurations. Customization options address specific industry requirements, including dental materials, cosmetic creams, and food applications .

Mid-Scale Series (50-250L): Floor-mounted units designed for small-to-medium production volumes. Standard hydraulic lifting and robust construction support continuous operation. Dedicated PU adhesive versions and 500L heavy-duty rail configurations are available, with explosion-proof options for chemical applications.

Large-Scale Series (300-2000L): Gantry-structured units for high-volume industrial production. The full range supports non-standard customization .

Note: Custom sizes from 2L to 2000L available upon request .

Technical Specifications (SXJ-15 Model)

Application Industries

Silicone Sealants and Adhesives: The SXJ-15 is ideal for manufacturing various sealant types including silicone sealant, polysulfide sealant, insulating glass sealant, waterproof sealant, structural adhesive, anaerobic adhesive, and stone glue. The mixer handles the high filler loadings common in sealant formulations while maintaining uniform dispersion and bubble-free products .

Electronics Materials: Suitable for electronic solder pastes, potting compounds, thermal interface materials, conductive silver pastes, and ceramic slurries. The vacuum degassing ensures void-free encapsulation and reliable electronic performance.

Chemical and Industrial: Applicable to synthetic resins, rubber, printing ink, putty, abrasives (creams), wax products, pigments, dyes, and coatings. The wall-scraping design ensures complete material turnover, eliminating residue and batch-to-batch variation .

Cosmetics and Personal Care: Perfect for creams, lipsticks, foundations, lotions, gels, facial masks, mascara, nail polish, and toothpaste. The vacuum degassing ensures bubble-free products with smooth textures and extended shelf life .

Food Processing: Applicable to jams, nut butters, sauces, fillings, chocolate syrup, and other high-viscosity food pastes. Stainless steel construction meets food-grade hygiene requirements, while precise temperature control prevents ingredient degradation.

Dental and Pharmaceutical: Used for dental impression materials, medical ointments, polymer gels (medical patches, cold relief patches), ice sticks, and eye ointments. Custom designs accommodate specific hygiene and mixing requirements, with material options including SUS316L for medical applications .