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  Product Data Sheet: Anti-scorching Agent PVI (CTP)

  High-Efficiency Pre-Vulcanization Inhibitor for Rubber Processing

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  1. Product Overview

  Product Name: Anti-scorching Agent PVI (CTP)

  Chemical Name: N-(Cyclohexylthio)phthalimide

  CAS No.: 17796-82-6

   Molecular Formula: C₁₄H₁₅NO₂S

  Description:

  Anti-scorching Agent PVI (CTP) is a highly effective pre-vulcanization inhibitor. It is designed to significantly extend the scorch safety of rubber compounds during processing (mixing, calendering, and extrusion) without affecting the final cure rate or the physical properties of the vulcanizate. It is an essential additive for modern rubber manufacturing, effectively reducing scrap rates and improving production efficiency.

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  2. Technical Specifications (TDS)

  We offer various forms (Powder, Oil-Coated, Granule) to meet specific handling and dispersion requirements.

  Test Item	Specification (Powder)	Specification (Oil-Coated)	Specification (Granule)	Test Method
  Appearance	White or Pale Yellow Powder	White or Pale Yellow Powder (Dust-free)	White or Pale Yellow Granules	Visual
  Melting Point	≥90.0∘C	≥89.0∘C	≥89.0∘C	GB/T 11409.1
  Heating Loss	≤0.30%	≤0.40%	≤0.40%	GB/T 11409.4
  Ash Content	≤0.10%	≤0.10%	≤0.10%	GB/T 11409.7
  Purity (Active Content)	≥97.0%	≥96.0%	≥96.0%	HPLC
  Sieve Residue (150μm)	≤0.10%	≤0.10%	N/A	GB/T 11409.5
  Oil Content	0%	1.0%−2.0%	N/A	--

  
  

  Selection Guide:

  • Oil-Coated Powder: Reduces dust pollution in the workshop.

  • Granules: Offers excellent flowability, automatic weighing convenience, and superior dispersion.

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  3. Key Features & Benefits

  • Precise Scorch Control: Prevents premature vulcanization ("scorch") during high-temperature processing stages, allowing for higher processing temperatures and faster throughput.

  • Maintains Cure Rate: Once the activation temperature is reached, PVI decomposes rapidly. It does not prolong the actual curing time or affect the modulus of the final product.

  • Improved Storage Stability: Significantly extends the shelf life of green rubber compounds (unvulcanized stock), preventing bin scorch during storage.

  • Adhesion Compatibility: Does not adversely affect the adhesion between rubber and brass-plated steel cords, making it ideal for radial tire manufacturing.

  • Non-Staining: Suitable for use in light-colored or colored rubber products.

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  4. Applications & Usage

  Compatibility:

  PVI is effective in Natural Rubber (NR) and various synthetic rubbers including SBR, BR, IIR, CR, EPDM, and NBR. It is most effective when used in sulfur-cured systems with Sulfenamide accelerators (e.g., CBS, TBBS, MBS).

  Main Applications:

  • Tires: Tread, sidewall, carcass, and bead compounds.

  • Industrial Goods: Conveyor belts, rubber hoses, seals, gaskets, and rubber rollers.

  • Footwear: Molded soles and foam products.

  • Cable: Rubber insulation and sheathing.

  Recommended Dosage:

  • Standard: $0.1 - 0.5$ phr (parts per hundred rubber).

  • Recovery: Can be used to reclaim slightly scorched compounds during re-milling.

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  5. Packaging & Storage

  • Packaging: 25kg/bag. Paper-plastic composite bags or woven bags with PE liner.

  • Storage: Store in a cool, dry, and well-ventilated area. Avoid direct sunlight. Storage temperature should not exceed $40^\circ C$.

  • Shelf Life: 24 months from the date of manufacture under recommended storage conditions.

  • Safety: Refer to the Material Safety Data Sheet (MSDS/SDS) before handling.

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