C9 petroleum resin low melting point resin

Technical analysis of low melting point resin of carbon nine petroleum resin

I. Definition and characteristics

Low melting point range:

Low melting point carbon nine petroleum resin usually refers to the model with softening point between 80-110℃ (ring and ball method), lower molecular weight (300-1000), and better melt fluidity.

By controlling the polymerization temperature and catalyst type (such as lowering the thermal polymerization temperature to below 200℃), the softening point of the resin can be reduced in a targeted manner.

Physical and chemical properties:

Solubility: It is easily soluble in solvents such as toluene and acetone, and has excellent compatibility with materials such as EVA and SBS, suitable for rapid melting and blending.

Stability: It retains the acid and alkali resistance (pH 3-12), water resistance and weather resistance of carbon nine resin, and is suitable for humid or outdoor environments.

II. Core application areas

Hot melt adhesive:

Replace rosin resin in SBS/EVA-based hot melt adhesive, provide rapid melting performance (120-150℃ processing temperature), and reduce the risk of yellowing (ΔE＜2.5 after UV aging).

Used in paper packaging glue, label glue and other scenarios, initial adhesion ≥ 6# steel ball, sustained adhesion ≥ 12h/1kg.

Rubber processing aids:

As a low-temperature tackifier, it quickly disperses during the rubber mixing stage (80-100℃) to improve the interfacial bonding strength between the rubber and the fiber/metal.

When the addition amount is 3-5%, the tear resistance of the rubber is improved by 10-20%, and the vulcanization efficiency is not affected.

Paint and ink modification:

Used in low-temperature curing paint systems to shorten the drying time (surface drying ≤ 10 minutes) while maintaining the toughness of the paint film (impact resistance ≥ 50cm).

As a binder in ink, it improves the dispersion and printability of pigments and is suitable for low-temperature processes such as flexographic printing.

III. Product selection and supply

Mainstream model parameters:

Softening point classification: 80-90℃ (ultra-low), 90-110℃ (general low melting point), color numbers cover 9#-14# (light color to translucent).

Process adaptation suggestions:

For scenarios requiring rapid melting (such as hot melt adhesives), models with a softening point of ≤100°C are preferred;

When the temperature resistance requirement is >100°C, it is recommended to compound DCPD resin (ratio 1:0.2-0.4) to balance the performance.

Low-melting-point carbon nine petroleum resin, with its fast processing characteristics and environmental advantages, has gradually replaced traditional high-softening-point resins in the fields of adhesives, rubbers and coatings, becoming the preferred material for refined processing scenarios.