What is PBT?

    1. Primary Composition: PBT monofilament is primarily composed of polybutylene terephthalate (PBT), with a density of 1.3-1.4 g/cm³ and a melting point of 220-230°C.

    2. Description: PBT monofilament features high strength, good elasticity, fatigue resistance, and solvent resistance. Its chemical nature is alkali-sensitive, making it commonly used in tapered filaments for paint brushes, toothbrushes, and makeup brushes.

    3. Tapered Filament: Tapered filament is made from polybutylene terephthalate (PBT) through melt spinning, where the tips are eroded to form a unique sharp peak shape. It is mainly used for toothbrushes, makeup brushes (mask, lip, eyeshadow brushes), calligraphy brushes, oil painting brushes, paint brushes, and wigs.

    4. Material Properties: PBT is a type of polyester plastic that contains benzene rings and ester groups in its molecular structure. It is relatively hard, usually harder than nylon.

    5. Fiber Properties: PBT bristles have high tensile strength and elastic modulus, excellent heat setting properties; low moisture absorption, suitable for wet working conditions, commonly used in toothbrushes, industrial brushes, and cleaning brushes, nail polish brushes; its tensile performance and toughness are also suitable for making musical strings.

    6. Versatility: PBT bristles share many properties with nylon but have a very low water absorption rate, allowing it to maintain its stiffness in humid environments. PBT bristles are an economical alternative to Nylon 66 or 612 and have better abrasion resistance than PP or PET. PBT bristles are widely used in toothbrushes and electric toothbrushes, face brushes, bath brushes, beauty and makeup brushes, medical cleaning brushes, electronic component dust brushes, and industrial cleaning brushes.

    7. Price Trends: Here are the current price trends for PBT (in RMB).

    8. Material Comparison Chart: Here is a comparison chart of various materials’ characteristics (in RMB).

    9. Applications in Paint Brush Industry:

     • Flexibility and Elasticity: PBT material naturally has good elasticity and flexibility, allowing tapered filaments to adapt to various surfaces and provide good painting effects, especially suitable for even application and edge detail handling.

     • Abrasion and Chemical Resistance: PBT offers excellent abrasion resistance and chemical resistance, maintaining a longer lifespan in paints and solvents. Therefore, paint brushes using PBT tapered filaments maintain good performance after multiple uses.

     • Bristle Structure Stability: PBT tapered filaments can be precisely ground to sharp tips, achieving a delicate application effect, ensuring even paint distribution without leaving marks. This bristle structure better controls flow during painting, improving paint coverage efficiency.

     • Antistatic Properties: Although PBT does not have as evident antistatic properties as natural pig bristle, its antistatic characteristics can be enhanced through processing modifications, making it more suitable for special painting environments by reducing static interference.

     • Environmental Friendliness: Compared to traditional animal bristles, PBT tapered filaments are synthetic materials, more environmentally friendly and easier to process, and can be customized in different hardness, elasticity, and colors to meet diverse customer needs.

    These advantages make PBT tapered filaments widely used in the paint brush industry, especially when high-quality painting effects and durability are pursued, making it an ideal choice for many manufacturers and users.