C9 petroleum resin (thermal polymerization)

C9石油树脂（热聚合法）的技术分析

一、化学成分和生产工艺

原料来源：乙烯裂解装置的副产品 C9 馏分是主要原料（包括苯乙烯、茚、甲基苯乙烯等成分），通过热聚合工艺制备。

反应机理：在高温（200-300℃）和催化剂作用下，C9芳香族组分发生自由基聚合，形成分子量在300-3000之间的低聚物链结构。

工艺特点：与催化聚合相比，热聚合不需要引入强酸催化剂，产品杂质含量较低（灰分含量≤0.1%），软化点可通过温度调节来控制（90-140℃）。

二、物理和化学性质

外观和形态：浅黄色至红棕色固体颗粒，色号范围为 9#-18#（随着聚合深度的增加，色度加深），透明度因色号不同而从半透明到不透明不等。

热性能：软化点范围 90-140℃（环球法），短期耐温性可达 180℃，长期使用温度建议 ≤120℃。

溶解性和相容性：易溶于甲苯、二甲苯、汽油等有机溶剂，与SBR、SBS、EVA等聚合物材料共混时表现出优异的相容性。

3. 核心应用领域

橡胶工业

作为子午线轮胎胎体橡胶增粘剂，它能提高橡胶与钢丝帘线之间的界面粘合强度（剥离力提高 20-30%）。

在橡胶密封条和减震器中添加 3-8% 的材料可以提高橡胶的抗撕裂性（提高 15-25%）和抗老化性。

粘合系统

用于 SBS 热熔胶配方中，以替代松香树脂，降低泛黄的风险（紫外线老化 500 小时后色差 ΔE <2.0）。

它在压敏胶中实现了初始粘合力（≥8#钢球）和持久粘合力（≥24h/1kg）之间的平衡，适用于标签和包装胶带等领域。

涂料和油墨 ‌ 作为高光泽涂料改性剂，它能提高漆膜的硬度（铅笔硬度≥2H）和耐盐雾性（≥1000小时）。

用作油墨印刷中的粘合剂，以增强颜料分散性并加速干燥（表面干燥时间≤15分钟）。

IV. 产品分类和选择 ‌ 颜色编号分类 ‌: 9#（浅黄色）至 18#（深棕色），低色号树脂（9-12#）适用于浅色产品，高色号（15-18#）多用于深色工业场景。

软化点选择：

低温型（90-110℃）：适用于热熔胶、低温涂料等需要快速熔化的场景；

高温型（120-140℃）：用于轮胎和高温密封剂等耐热领域。

热聚合碳九石油树脂具有可控的分子结构和环保的工艺优势，正在逐步取代粘合剂和橡胶改性等高端领域的传统催化产品。

Advantages of C9 petroleum resin(thermal polymerization)
1.Excellent high temperature resistance and thermal stability
Formed by high-temperature self-polymerization with dense aromatic ring structures.Its softening point generally ranges from 110℃to 150℃.It is hard to decompose or volatilize during high-temperature processing,suitable for high-temperature hot melt coatings and baking varnishes with less yellowing after long-time baking.
2.Strong adhesion and outstanding pigment wetting capacity
Rich aromatic rings bring higher polarity than C5 petroleum resin.It has great wetting effect on inorganic pigments and various substrates,greatly improving pigment dispersion and substrate adhesion of coatings and inks.
3.Superior resistance to weather,acid,alkali and chemicals
The aromatic hydrocarbon skeleton features strong chemical inertness with great resistance to weak acid,weak alkali,grease and organic solvents.The formed film has excellent waterproof and anti-rust performance,ideal for outdoor anti-corrosion coatings and floor paints.
4.High film hardness and high gloss
The cured film has high rigidity and scratch resistance.It effectively improves the gloss and fullness of coatings and printing inks for smooth and bright surface.
5.Low cost with sufficient raw material supply
C9 aromatic fraction is abundant at low cost.Thermal polymerization does not require catalyst,cutting production and formulation cost with high cost performance.
6.Perfect compatibility with aromatic systems
Fully miscible with aromatic solvents,rosin,phenolic resin,SBS,styrene-butadiene rubber and asphalt without delamination or precipitation,applicable to asphalt modification,industrial inks and anti-corrosion coatings.
7.Good tackifying and reinforcing performance
It enhances cohesion and softening point in asphalt and rubber systems,preventing asphalt cracking at low temperature and flowing at high temperature;it reinforces rubber products for better shaping effect.
8.Low ash content and few impurities
No Lewis acid catalyst residue during thermal polymerization,ultra-low ash content.It avoids pinholes and rust risks caused by ionic residues,matching high-end metal anti-corrosion coatings.
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