In the fields of fine chemicals, rubber auxiliaries, and polymer modification, N,N'-Diphenylthiourea (also known as Symmetric Diphenylthiourea, molecular formula: C13H12N2S, CAS No.: 102-08-9) is an indispensable aromatic thiourea derivative. Due to its unique molecular symmetrical structure and chemical reactivity, N,N'-Diphenylthiourea serves as an efficient rubber vulcanization accelerator, polymer thermal stabilizer, and specialty organic synthesis intermediate, exhibiting exceptional industrial application value across petrochemicals, polymers, and fine chemical manufacturing.

During continuous rubber processing and polymer extrusion, downstream processors impose strict requirements on the purity, melting point range, and trace impurities (such as residual aniline or dibenzylthiourea) of N,N'-Diphenylthiourea. Trace impurities can degrade the heat-aging resistance of vulcanizates, cause discoloration, or induce premature scorch.

As a trusted global supplier of quality chemicals and technical solutions, Wuxi High Mountain Hi-Tech Development Co., Ltd. specializes in the bulk export and supply chain support of high-purity industrial-grade N,N'-Diphenylthiourea. Below is an in-depth analysis of its core physicochemical parameters, industrial applications, and quality control standards.

I. Physicochemical Properties & Quality Control Standards

N,N'-Diphenylthiourea appears as a white to pale yellow crystalline powder at ambient temperature and pressure, possessing a well-defined molecular geometry. It is sparingly soluble in water and cold ethanol, and readily soluble in dimethyl sulfoxide (DMSO), acetone, and hot aromatic hydrocarbon solvents. Compared to aliphatic thioureas, the benzene rings in its structure impart superior thermal stability and low volatility.

Core Technical Specifications of High Mountain N,N'-Diphenylthiourea:

• Main Assay: $\ge 99.0\%$ (determined by GC/LC);

• Melting Point Range: $240.0^\circ\text{C} - 242.0^\circ\text{C}$, featuring a narrow melting range reflecting a highly purified crystalline state;

• Loss on Drying (Moisture): $\le 0.30\%$, preventing hydrolysis or side reactions during melt processing;

• Ash and Impurity Control: Ash $\le 0.20\%$, with strict limits on free aniline and homolog impurities to secure long-term heat-aging resistance and physical mechanical strength in vulcanized compounds.

II. Core Industrial Applications

Driven by its high thermal stability and active functional groups, N,N'-Diphenylthiourea plays a critical role across several industrial sectors:

1. High-Efficiency Rubber Vulcanization Accelerator:

   • Primarily utilized as an accelerator (Accelerator CA) for natural rubber, nitrile rubber (NBR), chloroprene rubber (CR), and ethylene propylene diene monomer (EPDM);

   • Demonstrates a significant synergistic activation effect in sulfur and thiuram accelerator systems, shortening vulcanization times by 15%–20% while maintaining excellent scorch safety and tensile strength.

2. Polymer Melt Thermal Stabilizer:

   • Applied as a thermal stabilizer during the extrusion and calendering of polyvinyl chloride (PVC) and vinyl chloride copolymers, effectively suppressing thermo-oxidative degradation and discoloration.

3. Crystallization Modifier and Resin Additive:

   • Utilized in polyester and epoxy resin composites to control crystal morphology and grain size, thereby improving optical transparency and impact toughness in final products.

4. Mineral Flotation Collector and Specialty Synthesis:

   • Functions as a high-selectivity collector for non-ferrous metal ores (such as copper, lead, and zinc ores);

   • Serves as a key building block for synthesizing sulfur-containing heterocyclic compounds in the pharmaceutical and dye industries.

III. Packaging, Storage, and Safety Protocols

N,N'-Diphenylthiourea is sensitive to moisture and prone to hydrolytic degradation in environments exceeding 60% relative humidity. Bulk industrial transport and storage must adhere to strict guidelines:

• Packaging Specifications: Packed in 25 kg paper-plastic composite bags or woven bags with internal aluminum foil vacuum liners and desiccants to ensure effective moisture and oxidation resistance.

• Storage Requirements: Store in a cool, dry, and well-ventilated dedicated warehouse away from fire sources, heat, and strong oxidizers. Opened packages should ideally be consumed within 72 hours, and unused portions must be resealed securely.

• Safety Handling: Operators must wear dust masks, chemical safety goggles, and anti-static gloves during handling and unpacking to avoid dust inhalation and direct skin contact.

IV. Wuxi High Mountain: Bulk Supply & Global Logistics Support

Wuxi High Mountain Hi-Tech Development Co., Ltd. provides stable and efficient bulk supply chain support for global rubber product manufacturers, polymer compounders, and trading partners:

• Three-Tier Quality Control System: Spanning raw material intake testing (LC-MS / IR spectroscopy), intermediate crystallization and filtration monitoring, and final batch certification (COA) to guarantee high batch-to-batch consistency;

• Comprehensive Compliance Documentation: Every shipment is accompanied by a Certificate of Analysis (COA), GHS-compliant Safety Data Sheet (MSDS/SDS), and Technical Data Sheet (TDS);

• Flexible International Logistics: Supporting full container load (FCL) shipping and customized moisture-proof palletized packaging to accommodate various international trade terms including FOB, CIF, and DAP.

Business Contact and Procurement Inquiries

To inquire about bulk pricing (FOB / CIF / DAP) for N,N'-Diphenylthiourea, request samples, or obtain Technical Data Sheets (TDS), please contact our international trade team:

• Contact Person: Mr. Fan

• Mobile / WeChat / WhatsApp: +86-13382223993

• Office Line: +86-510-85881876

• E-mail: sales1@wxhmchem.com / Harold2@high-mountain.cn

• Chinese Official Website: www.wxhmchem.com

• Russian Market Platform: www.highmountainchemru.com