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In the process of manufacturing plastics and inks, in addition to the base resin as the main raw material, it is necessary to add some substances that improve the performance or processing characteristics of plastics and inks in the resin, such substances are additives or additives for plastics and inks . Additives include both organic and inorganic substances; both single substances and mixtures; both low-molecular substances and high-molecular substances. With the wide application of high-tech processing technology in the plastics, packaging and ink industries, additive technology, as an important part of technological innovation in packaging and printing industry, has gradually become the focus of innovation in the industry.
Improve the processing and use performance of plastics
Additive technology can effectively improve the processing properties of plastics, the mechanical properties of films (such as shrinkage, rigidity, etc.), electrical properties (such as charge mobility, antistatic properties), optical properties (such as gloss, haze, etc.), weather resistance (Anti-oxidation, anti-ultraviolet, high and low temperature suitability) and the performance of packaging materials. For example, in the production process of films and packaging bags, the surface properties and coefficient of friction of the film are an important technical indicator. The friction coefficient of the film is related to the type, addition amount, particle size, shape, dispersibility of the additive (mainly anti-blocking agent) and the degree of its treatment. Such as commonly used additives for biaxially oriented polyester film are SiO2, TiO2, CaCO3, AL2O3, MgO and so on. As the amount added increases, the surface roughness of the film increases and the friction coefficient decreases. Reduce the friction coefficient of the film so that its value is in the range of 0.3-0.4. In the process of printing and aluminum plating, it can enhance the bonding force between the ink, aluminum layer and plastic film. In order to meet the requirements of high-speed automatic filling machine for some packaging bags, the inner surface of the packaging bags should have a certain smoothness. Generally, a certain amount of slip agent, such as oleic acid amide, etc. is added to the inner layer material such as polyethylene particles to make the film slip. Due to the poor compatibility of oleic acid amide and polyethylene, its molecules can easily migrate to the film surface, forming a weak interface layer. If the content of slip agent is too high, the interface layer will weaken the adhesion fastness between the ink, adhesive and film surface, affecting the product quality of the printing and dry process. We usually require the coefficient of dynamic friction of the inner surface of the polyethylene film to be in the range of 0.2-0.4. When blowing polyethylene film, adding a small amount of low molecular fluoropolymer can effectively improve the processing and film forming performance of linear low density polyethylene (LLDPE) and metallocene-catalyzed polyethylene (mPE), and reduce the The viscosity under high temperature and high die cutting state reduces the friction between the melt and the screw, barrel, die mouth (die lip), especially the surface quality of the film is significantly improved. Antistatic agents can improve the electrical properties of plastic films, enhance charge mobility, reduce the amount of electrostatic charges on the surface, facilitate high-speed processing of plastic films during printing and compounding, improve the efficiency of the process of filling powder products and the sealing strength of packaging bags . Additives in the process of high temperature and rapid die cutting can easily produce volatile substances, which can cause odor in packaging materials. Therefore, the additives should be selected according to the requirements of the packaging products on the packaging materials.
Add more functions of plastic materials
Adding a tackifier to polyethylene resin can increase the viscosity of the film surface. Adding gas phase anti-rust agent to polyethylene resin to make anti-rust film, which has the function of gas phase anti-rust, and has the effect of gas phase anti-rust on the packaged metal products. In particular, the addition of degradation accelerators, such as biodegradation agents, photodegradation agents, and thermal oxygen degradation agents, to plastic packaging materials can effectively reduce the environmental pollution caused by plastic waste.
Significance in ink processing and use
Ink as an organic system composed of pigments, additives, binders, fillers, solvents and other different types of chemical substances with different properties, to increase the compatibility of various substances, improve the activity of pigments and fillers, so that the performance of the ink good. Achieve better printability, such as consistent hue, good gloss, good ink film strength, friction resistance, oxidation resistance, etc. Although the amount of additives added to the ink is very small, it has an important effect on the viscosity, dryness and color of the ink. There are many types of additives used in inks, mainly plasticizers, quick-drying agents, slow-drying agents, etc. The binder with chemical adsorption and physical winding has a more obvious role in the ink. Binders are conducive to the affinity between pigments, binders and fillers in the printing ink system, improving the adhesion and mechanical strength of the ink; reducing the thickness of the ink film; preventing the phenomenon of floating colors and flowering of the printed products; eliminating the printing process Quality accidents such as knives and paste plates occur; extend the storage period of ink. The antistatic agent used in the ink can improve the antistatic performance of the ink, increase the printing speed, and eliminate all kinds of printing quality problems caused by static electricity. The additives and their contents are selected according to factors such as the basic properties of the printed substrate, such as electrical properties, printability, process conditions including differences in ambient temperature and humidity. If the environment humidity is large, the film is not easy to dry under the condition of high printing speed, and the film is prone to blocking phenomenon after printing, you should add a quick-drying agent and reduce the content of the oxidation accelerator in the ink; otherwise, if the environment is dry , You should add slow drying agent appropriately.
No one kind of additive can meet all the conditions of matrix resin, process conditions, material properties, and technical requirements at the same time. In actual production, it is often necessary to scientifically select and optimize the configuration of multiple additives so that multiple additives can work together to benefit both. Processing can get more excellent comprehensive performance.
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