In today's increasingly high-speed, automated development, plastics inevitably wear friction with equipment or between products during processing or molding. Due to the existence of friction, its fluidity is reduced, energy consumption is increased, surface roughness is tarnished, and it has a very adverse effect on the molding and processing of many plastics. At the same time, the film material is prone to adhesion, and the phenomenon of poor opening is also a problem that the film needs to be solved during use.
In addition, the wide application of filler materials such as calcium carbonate, talc and diatomaceous earth has brought new problems to the quality of plastic processing and products, affecting the smoothness and surface gloss of the surface of the products. In order to solve the above problems, the development and application of the slip agent is particularly important.
At present, there are three types of common slip agents in China: amides (oleic acid amide and erucamide), soaps (calcium stearate, etc.) and silicones (silicone). The latter is liquid, which is inconvenient to add and expensive, and is difficult to promote and apply. Although the soap product is inexpensive, the effect is not satisfactory, and the amount of addition is large, and it is basically unusable in medium and high-grade products. The two kinds of slip agents, oleic acid amide and erucic acid amide, are moderately priced, have obvious effects, are rarely added (0.05% to 0.3%), are non-toxic (certified by FDA), and have a wide range of uses. Therefore, it has broad application prospects. Below, we will take a look - the small body of the slip agent, great effect.
The role of slip agent in resin or ink processing
LDPE resin
In the low-density polyethylene (LDPE) resin, 0.05% to 0.3% oleic acid amide is added, which can significantly reduce the static and dynamic friction factors of the resin and improve the processability of the resin.
PP cable material
In the polyolefin cable material and in the all-plastic communication cable material, oleic acid amide (0.05%) was added, and the friction factor was reduced from 0.70 to 0.16, and the coloring property was also improved.
Ink
The use of oleic acid amide or erucamide in plastic inks (printing inks) not only improves the smoothness and smoothness of the ink surface, but also improves the adhesion, anti-sticking and scratch resistance of the ink on the printed crystal surface. And anti-offset, making the imprint clear, bright color.
Powder coating and wood coating
Oleic acid amide or erucic acid amide is used in EVA, PVC, polyethylene (PE), epoxy resin, acrylic, nylon and polyester powder coating systems to improve the smoothness, surface color and anti-stickiness of the coating film. Anti-offset, adhesion and chemical resistance, the dosage is 1-4%. Adding oleic acid amide or erucic acid amide to the wood lacquer can increase its surface slip, scratch resistance, anti-stickiness and hydrophobicity, and can achieve a soft and delicate hand feeling, and the dosage is 0.3~2.5%.
Nylon, styrene, thermoplastic elastomer or butyl ester resin
Adding 0.01~0.5% oleic acid amide or erucamide to nylon, styrene, thermoplastic elastomer or butyl ester resin, the final product has good release and anti-adhesive effect.
The role of slip agent in the material forming process
LDPE film
Adding a small amount of slip agent during the LDPE film forming process can improve the opening property of the film, effectively prevent the film from sticking together, increase the film hand feeling and improve the surface finish.
PP wire
Adding a small amount of slip agent to the PP wire forming can improve the dispersibility in the wire material such as carbon black, and at the same time improve the smoothness of the inner wall of the cable sheathing tube, and realize high-speed extrusion of the cable pellet.
BOPP film
As a new type of packaging material, BOPP has been widely used in the tobacco industry. In order to meet the production requirements of cigarette packaging machines with speeds of up to 500-800 bags per minute, the friction factor must be ≤0.2, only erucamide is added. Only about 0.12%) can get such a low static and dynamic friction factor.
syringe
Disposable medical syringes have a particularly high requirement for transparency, strength, elasticity and surface smoothness. Therefore, a slip agent must be added to the material forming.
Liquid packaging film
Liquid materials such as milk, soy milk, soy sauce, and beverages packaged in automatic filling machines require that the packaging film is easy to open and the dynamic friction factor is ≤0.35. Only the addition of oleic acid amide or erucamide to the packaging material can meet the above requirements.
Composite film
In order to make the friction coefficient of the composite film (such as transparent PP composite film and PP pearl film) less than 0.4, it is necessary to add a slip agent (oleic acid amide or erucamide), which should generally be added to the core layer (intermediate layer). Move it to the surface to reduce the friction factor.
Foamed polyethylene products
Adding 0.02% to 0.1% oleic acid amide in the molding of expanded polyethylene (fruit net) can make the static friction factor ≤0.30, and the gloss is obviously increased.
At present, plastic packaging materials have exceeded 30% of the total consumption of plastics in China. The static and dynamic friction factors (ie, smoothness and openness) on the surface of packaging film materials are the most important technical quality indicators for various mechanized and automated packaging processes. It is also one of the most critical quality factors affecting the efficiency of packaging operations. Only by adding a certain amount of slip agent can the friction coefficient of the film be effectively reduced, and the film can be self-adhesively bonded or bonded to the packaged object. In view of the rapid development of the plastics industry for packaging and printing, the market demand for high-performance slip agents will also grow rapidly.
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