Introduction to PE wax:
Polyethylene wax (PE wax), also known as polymer wax, abbreviated as polyethylene wax. Due to its excellent cold resistance, heat resistance, chemical resistance, and wear resistance, it has been widely used. In normal production, this wax can be directly added as an additive to polyolefin processing, which can increase the gloss and processing performance of the product. As a lubricant, it has stable chemical properties and good electrical performance. Polyethylene wax has good compatibility with polyethylene, polypropylene, polyethylene terephthalate, ethylene propylene rubber, and butyl rubber. Can improve the flowability of polyethylene, polypropylene, ABS, and the demolding properties of polymethyl methacrylate and polycarbonate. Compared with other external lubricants, polyethylene wax has a stronger internal lubrication effect on PVC. It is used as a dispersant for various hot melt adhesives, thermosetting powder coatings, road sign paints, and marking paints in hot-melt product coatings, and has good anti settling effect, making the products have good luster and three-dimensional sense, anti-wear, lubrication, and anti settling effect
Application characteristics of PE wax for hot melt coatings:
The application of polyethylene wax in hot melt coatings, specifically polyethylene wax for hot melt road marking coatings, mainly considers the purity of polyethylene wax, whether it contains paraffin, whether there is mixed calcium powder adulteration, etc. The low softening point of polyethylene wax can easily cause the hot melt marking to soften, dry slowly in summer, fall off, crack, and be not resistant to dirt. It is recommended to use pure polyethylene wax with a softening point of not less than 100 degrees.
PE wax is mainly used in hot-melt road marking coatings and has the following characteristics:
(1) High softening point can improve the heat resistance of coatings; Low viscosity, adjustable to improve leveling.
(2) Wear resistant, scratch resistant, and abrasion resistant: Wax is distributed in the coating film to protect it, prevent scratches and abrasions, and provide wear resistance.
(3) Control friction coefficient: Usually utilizing its low friction coefficient, it provides excellent smoothness of the coating, while also having a special silky soft touch due to different types of wax.
(4) Chemical resistance: Due to the stability of wax, it can give the film better water resistance, salt water spray resistance and other properties.
(5) Prevent adhesion: Avoid sticking or sticking of painted or printed materials.
(6) Control glossiness: Choose the appropriate model, with different extinction and glossiness effects depending on the amount added, resulting in a good three-dimensional effect.
(7) Prevent the hardening and deposition of auxiliary materials such as silica, and increase the stability of coating storage.
The function of C5 resin:
C5 petroleum resin is also known as C5 resin. This material is mainly derived from the cracking of C5 raw materials, a byproduct generated during the production process of ethylene plants, and is obtained through separation polymerization reactions as a glassy thermoplastic or viscous liquid resin polymer material. The molecular weight of this material is below 2000, and it has the characteristics of high miscibility, oxidation resistance, strong viscosity, strong water resistance, and low melting point acidity value. Its function is that some coating companies add C5 petroleum resin as an additive to coatings during the production process and mix it with other raw materials. This not only increases the glossiness, water resistance, oxidation resistance, and hardness of coating products to a certain extent, but also improves the quality of coatings and reduces production costs. Light colored resins can be added to oil soluble coatings to further improve their adhesion and overall quality. Hot melt coatings made from C5 petroleum resin can increase the flowability of the coating after heating and can be directly applied to the adhesive. After cooling, a solid adhesive is formed, achieving the adhesive effect. In addition, C5 petroleum resin can also be used as an additive in road sign paint coatings.
What are the effects of C5 resin quality on coatings:
1. Softening point:
The use of resin with a softening point that does not meet the standard will result in the formation of markings in its coating. In the hot summer, the markings are prone to softening, leading to wheel marks and contamination. If the softening point is too high, the melting temperature of the coating during construction will become too high, which not only wastes energy, but also makes the marking easy to peel off in the cold winter. Generally, the softening point requirement is between 85 ℃ and 120 ℃.
2. Introduction and function of titanium dioxide:
Titanium dioxide is an important inorganic chemical pigment, mainly composed of titanium dioxide. There are two production processes for titanium dioxide: sulfuric acid method and chlorination method. It has important applications in industries such as coatings, inks, papermaking, plastic rubber, chemical fibers, ceramics, etc., and its performance characteristics include high whiteness and strong covering power. Hydrophilic and oleophilic products overcome the shortcomings of general titanium dioxide, such as difficulty in dispersion and easy precipitation in their respective dispersion systems, significantly improving their dispersibility and anti precipitation properties, making your product more stable and satisfactory, with strong weather resistance.
Titanium dioxide, as a pigment, is used in coatings. Pigments have the ability to cover and decorate, achieving decorative and aesthetic effects. At the same time, pigments can enhance the mechanical strength and adhesion of coatings, which can extend the service life of coatings.
What are the main impacts of the quality of titanium dioxide on coatings
1. Whiteness:
As a white pigment in coatings, the whiteness of titanium dioxide is crucial and is one of the key quality indicators required for coatings. Poor whiteness of titanium dioxide directly affects the appearance of the coating film. The main factor affecting the whiteness of titanium dioxide is the type and content of harmful impurities, as titanium dioxide is very sensitive to impurities, especially rutile type titanium dioxide. So, even trace impurities can have a significant impact on the whiteness of titanium dioxide. The whiteness of titanium dioxide produced by the chlorination process is often better than that produced by the sulfuric acid process. This is because the raw material titanium tetrachloride used in the production of titanium dioxide by the chlorination process has been distilled and purified, and its impurity content is low, while the raw material used by the sulfuric acid process has a high impurity content, which can only be removed through processes such as washing and bleaching.
2. Covering power:
The covering power is the surface area of the object being coated per square centimeter. When the same area of the coating is completely covered, the greater the covering power of the titanium dioxide used, the thinner the coating film can be, and the less coating is required, the less titanium dioxide is needed. If the covering power of the titanium dioxide decreases, the amount of titanium dioxide required to achieve the same covering effect will increase, and the production cost will increase. Moreover, the increase in the amount of titanium dioxide used will cause the titanium dioxide to be difficult to disperse evenly in the coating, resulting in aggregation and affecting the covering effect of the coating.
3. Weather resistance:
Coatings require high weather resistance for titanium dioxide, especially for outdoor surface coatings that require high or ultra-high weather resistance for titanium dioxide. Using titanium dioxide with low weather resistance may cause problems such as fading, discoloration, powdering, cracking, and peeling of the coating. The crystal structure of rutile type titanium dioxide is more compact than that of anatase type titanium dioxide, with lower photochemical activity and much higher weather resistance. Therefore, most of the titanium dioxide used in coatings is rutile type titanium dioxide. The main method to improve the weather resistance of titanium dioxide is to perform inorganic surface treatment, which involves coating the surface of titanium dioxide particles with one or more layers of inorganic oxides or hydrated oxides.
4. Dispersion:
Titanium dioxide is an ultrafine particle with a large specific surface area and high surface energy. It is prone to aggregation between particles and difficult to stably disperse in coatings. The poor dispersibility of titanium dioxide directly affects its optical properties such as color fading power, coverage power, and surface glossiness in coatings, as well as its application performance such as storage stability, fluidity, leveling, coating durability, corrosion resistance, and conductivity. In addition, it also affects the production cost of coatings because the energy consumption of grinding and dispersion operations is high, accounting for the majority of the total energy consumption in the coating manufacturing process, and the loss of instruments and equipment is large.
5. Oil absorption capacity:
Oil absorption is not a pigment characteristic of titanium dioxide, but rather an indicator for evaluating the quality of pigments used in titanium dioxide. The oil absorption of a pigment refers to the minimum quality of oil required to achieve safe wetting of 100G pigment per percentage. If the oil absorption is high, the coating made with the same formula will be thick. To make it less thick, more oil needs to be added, which reduces the pigment content in the coating, affects the performance of the coating, as well as dispersibility and gloss. A high oil absorption will increase the pigment base of the coating, thereby greatly increasing the cost of the coating.
Introduction and function of dioctyl phthalate (DOP):
Di (2-ethylhexyl) phthalate (DOP) is an organic ester compound and a commonly used plasticizer. DOP is a universal plasticizer mainly used in the processing of polyvinyl chloride esters, as well as in the processing of high polymers such as chemical resins, acetic acid resins, ABS resins, and rubber. It can also be used in the production of paints, dyes, dispersants, etc. DOP plasticized PVC can be used in the manufacturing of artificial leather, agricultural films, packaging materials, cables, etc. DOP is a universal plasticizer and the most widely used plasticizer in industry. In addition to cellulose acetate and polyvinyl acetate, this product has good compatibility with the vast majority of synthetic resins and rubbers used in industry. This product has good comprehensive performance, good mixing performance, high plasticizing efficiency, low volatility, good low-temperature flexibility, water resistance to extraction, high electrical performance, good heat resistance and weather resistance.
Reasons for blackening of hot-melt marking paint after application:
Generally speaking, objective factors such as weather and construction, as well as the properties of hot-melt marking coatings themselves, can affect the degree of contamination of the marking. The main component of hot-melt marking paint is C5 petroleum resin, which is a thermoplastic substance. When the temperature is too high, the coating tends to soften, the surface viscosity increases, and it is easy to adsorb dust and car exhaust in the air, causing the marking to turn black. If the hot-melt marking is located in areas with high traffic flow or friction, it is also prone to pollution, such as intersections, parking and starting, braking, and frequent U-turns.
