Petroleum resins (hydrocarbon resin) is a thermoplastic resin produced by pretreatment, polymerization, distillation and other processes of C5 and C9 fractions produced by petroleum cracking. It is not a high polymer, but a low molecular weight polymer between 300-3000.
Petroleum resin is a newly developed chemical product in recent years. It is named after the source of petroleum derivatives. It has the characteristics of low acid value, good miscibility, water resistance, ethanol resistance and chemical resistance, and good chemical stability to acid and alkali. , and has good viscosity adjustment and thermal stability, low price. Petroleum resins are generally not used alone, but are used together as accelerators, regulators, modifiers and other resins. Widely used in rubber, adhesives, coatings, paper, ink and other industries and fields.
Generally, it can be classified as C5 aliphatic, C9 aromatic (aromatic hydrocarbons), DCPD (cycloaliphatic, cycloaliphatic) and pure monomers such as poly SM, AMS (alpha methyl styrene) and other four forms of products, Its constituent molecules are all hydrocarbons, so it is also called hydrocarbon resins (HCR).
According to the different raw materials, it is divided into Asiatic resin (C5), alicyclic resin (DCPD), aromatic resin (C9), aliphatic/aromatic copolymer resin (C5/C9) and hydrogenated petroleum resin. C5 hydrogenated petroleum resin, C9 hydrogenated petroleum resin
The most widely used are C9 petroleum resin and C5 petroleum resin.
C9 petroleum resin specifically refers to a resinous substance obtained by "polymerizing olefins or cyclic ole fins or copolymerizing with aldehydes, aromatic hydrocarbons, terpenes, etc." containing nine carbon atoms.
C9 petroleum resin, also known as aromatic resin, is divided into thermal polymerization, cold polymerization, tar and so on. Among them, the cold polymerization product is light in color, good in quality, and has an average molecular weight of 2000-5000. Light yellow to light brown flake, granular or massive solid, transparent and shiny, relative density 0.97~1.04.
The softening point is 80~140℃. The glass transition temperature is 81°C. Refractive index 1.512. Flash point 260 ℃. Acid value 0.1~1.0. The iodine value is 30~120. Soluble in acetone, methyl ethyl ketone, cyclohexane, dichloroethane, ethyl acetate, toluene, gasoline, etc.
Insoluble in ethanol and water. It has a cyclic structure, contains some double bonds, and has strong cohesion. There are no polar or functional groups in the molecular structure and no chemical activity. Has good acid and alkali resistance, chemical resistance and water resistance.
Poor adhesion, brittleness, and poor aging resistance, it should not be used alone. Good compatibility with phenolic resin, coumarone resin, terpene resin, SBR, SIS, but poor compatibility with non-polar polymers due to high polarity. Flammable. Nontoxic.
With its high peeling and bonding strength, good fast tack, stable bonding performance, moderate melt viscosity, good heat resistance, good compatibility with polymer matrix, and low price, it began to gradually replace natural resin to increase viscosity agents (rosin and terpene resins).
The characteristics of refined C5 petroleum resin in hot melt adhesives: good fluidity, can improve the wettability of the main material, good viscosity, and outstanding initial tack performance. Excellent anti-aging properties, light color, transparent, low odor, low volatiles. In hot melt adhesives, ZC-1288D series can be used alone as tackifying resin or mixed with other tackifying resins to improve certain characteristics of hot melt adhesives.
Hot melt adhesive:
The basic resin of hot melt adhesive is ethylene and vinyl acetate copolymerized under high temperature and high pressure, namely EVA resin. This resin is the main component for making hot melt adhesive. The proportion and quality of the basic resin determine the basic properties of the hot melt adhesive.
Melt index (MI) 6-800, low VA content, the higher the crystallinity, the higher the hardness, under the same circumstances, the greater the VA content, the lower the crystallinity, the more elastic High strength and high melting temperature are also poor in wetting and permeability of adherends.
On the contrary, if the melting index is too large, the melting temperature of the glue is low, the fluidity is good, but the bonding strength is reduced. The selection of its additives should choose the appropriate ratio of ethylene and vinyl acetate.
Other applications: hot melt pressure sensitive adhesive, solvent pressure sensitive adhesive.
1. Paint
The paint mainly uses C9 petroleum resin, DCPD resin and C5/C9 copolymer resin with high softening point. Adding petroleum resin to the paint can increase the gloss of the paint, improve the adhesion, hardness, acid resistance and alkali resistance of the paint film.
2. Rubber
Rubber mainly uses low softening point C5 petroleum resin, C5/C9 copolymer resin and DCPD resin. Such resins have good mutual solubility with natural rubber particles, and have no great influence on the vulcanization process of rubber. Adding petroleum resin to rubber can increase viscosity, strengthen and soften. In particular, the addition of C5/C9 copolymer resin can not only increase the adhesion between rubber particles, but also improve the adhesion between rubber particles and cords. It is suitable for rubber products with high requirements such as radial tires.
3. Adhesive industry
Petroleum resin has good adhesiveness. Adding petroleum resin to adhesives and pressure-sensitive tapes can improve the adhesive force, acid resistance, alkali resistance and water resistance of the adhesive, and can effectively reduce the production cost.
4. Ink industry
Petroleum resins for inks are mainly high softening point C9 petroleum resins and DCPD resins. Adding petroleum resin to ink can play the role of color development, quick drying, brightening, and improve printing performance.
5. Coating industry
Coatings for road signs and road marking, petroleum resin has good adhesion to concrete or asphalt pavement, and has good wear resistance and water resistance, and has good affinity with inorganic substances, easy to coat, good weather resistance,
Fast drying, high firmness, and can improve the physical and chemical properties of the layer, improve UV resistance and weather resistance. Petroleum resin road marking paint is gradually becoming mainstream, and the demand is increasing year by year.
6. Others
Resin has a certain degree of unsaturation and can be used as paper sizing agent, plastic modifier, etc.
7. Petroleum resin is a non-dangerous product. During transportation, it should be protected from sunlight and rain; it cannot be transported together with spontaneous combustion materials, strong oxidants, and strong acids.
Store in a ventilated, cool and dry environment. The storage period is generally one year, and it can still be used after one year if it passes the inspection.
