Development of the hottest printing ink and its cl

2022-08-11
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Development of printing ink and its cleaning agent (Part 2)

3.2 water based cleaning agent

the biggest advantage of water-based cleaning agent is that it is completely nonflammable, so it is very safe in use. Its cleaning effect is completed by the joint action of surfactant and alkaline additives. Its mechanism of action has been introduced in detail in many articles, so I won't repeat it here, but just give an example to illustrate. The formula of a printing ink cleaning agent is: 40% sodium silicate 75g, 97% naoh8g, octyl phenol polyoxyethylene ether 30g, coconut oil dimethyl benzyl ammonium chloride 2G in the spring tide, and add water to 1000g. When preparing, first dissolve the first two ingredients in water in proportion, and then mix them with the latter two ingredients. It is a kind of cleaning agent with strong cleaning and decontamination power and will not cause harmful effects on the printing plate pattern. Put the lithographic printing plate in this cleaning agent for 30s, and then scrub it to completely decontaminate, and there will be no stains after 30000 times of printing

3.3 oil in water emulsion cleaning agent

this kind of cleaning agent is an oil in water emulsion formed by adding composite surfactants and other additives to the mixture of flammable organic solvents such as gasoline and water. Because the formula contains a large amount of non combustible water, this cleaning agent overcomes the shortcomings of the original cleaning agent, which is flammable and explosive. Other advantages of oil in water emulsion cleaning agent include: reducing the amount of oily solvent in the formula, avoiding its pollution to the environment, while still maintaining the performance of organic solvent with good cleaning power for ink; Due to the formation of oil in water emulsion, the oil is dispersed and wrapped in water, greatly reducing its volatility; Surfactants play a variety of roles such as wetting, penetration, emulsification and dispersion, which can improve the decontamination ability of cleaning agents; Due to the existence of water, the cleaning ability of water-soluble dirt is greatly improved. Because the oil in water

emulsion detergent has the characteristics of low cost, simple and convenient preparation process, good cleaning effect, non flammable, safe use and so on, it is attracting extensive attention and Research on this kind of detergent. For example, Yu Qiang of Nanchang University and others developed this type of cleaning agent, which is a mixed surfactant emulsifier composed of water-soluble fatty alcohol polyoxyethylene ether and oil-soluble dehydrated sorbitol fatty acid ester (the two surfactants are prepared in the ratio of 1:3 ~ 1:4) in common solvents containing esters, ketones, ethers, alcohols and Aromatics, In addition, it is made by adding 5% - 10% aromatic alcohol additives and water, stirring and dispersing for 30 ~ 40min. Their research shows that the effect of emulsifier in the aqueous phase method is better for the addition of mixed surfactant emulsifier (that is, adding emulsifier to water first, and then adding oil phase to obtain the most stable emulsion). The amount of emulsifier has an effect on the stability and cleaning effect of the emulsion, and the effect is the best when the amount of emulsifier is 7%. When the content of organic solvent in the emulsion is 20% - 25% (volume ratio), the stability and cleaning power are the best

another oil in water emulsion type cleaning agent developed by Wang Yimin, Department of chemical engineering, Tangshan University, Hebei Province, uses a mixed solvent composed of 310 color ink solvent oil and 200 solvent oil. This mixed solvent has a wide distillation range and better solubility than a single solvent. The surfactants used are OP-10 (alkylphenol polyoxyethylene ether) and Las (Sodium Alkylbenzene Sulfonate). In order to reduce the corrosion of the cleaning agent to the printing machinery, triethanolamine and benzotriazole are also added as rust inhibitors. Triethanolamine plays a certain role in adjusting the pH value, the stability of the emulsion, and improving the washing ability. A small amount of n-butanol is added to strengthen the stability and penetration of the cleaning agent. The specific formula is: 310 special solvent oil 25%, 200 solvent oil 15%, op-101.5%, las2.5%, other additives 5%, add water to 100%. During preparation, solvent oil and OP-10 are mixed to form phase a, Las, triethanolamine and water are mixed to form phase B, phase B is heated to 55oc, and phase A is added under stirring, and emulsion is formed under the action of high-speed stirring or colloidal mill. Finally, add other additives to the finished product

3.4 semi water based ink cleaning agent

at present, semi water based cleaning agents are often used to clean printing inks abroad. For example, Li Feng's article listed in the reference materials in this paper introduces that a kind of ink cleaning agent currently used in Japan is semi water based. From the perspective of composition and performance, semi water-based ink cleaner is very similar to emulsion cleaner. Both of them are composed of three main components: organic solvent, water and surfactant. Both have the advantages of dissolving and removing oily dirt and water-soluble dirt at the same time, and overcome the shortcomings of the original solvent, which is flammable, explosive and poor safety. The differences between the two are as follows: from the appearance, the semi aqueous detergent is transparent, while the emulsion is white, turbid and opaque; The water content of semi aqueous detergent is less, generally between 5% and 20%, while the water content in emulsion can vary in a large range. Because the emulsion contains less organic solvents, its ability to clean ink is not as good as that of semi aqueous detergent; Because emulsion is a heterogeneous system in a metastable state, demulsification and stratification sometimes occur in use. In addition, semi water-based detergent is the original solution produced by the manufacturer, which cannot be diluted, while the manufacturer of oil in water emulsion detergent sometimes produces concentrated solution, which can be diluted with water according to actual needs during application

semi water based ink cleaner also has good cleaning performance. Because the solvent oil in its composition contains a high amount of professional terms of Jinan gold testing machine, it has strong ink cleaning power, the technical indicators of multi-functional intelligent tensile testing machine can be used together with ultrasonic cleaning, and it overcomes the shortcomings of flammable and explosive solvent oil (the flash point of semi water based ink cleaner can be increased to more than 100oC), so it is popular abroad. However, compared with emulsion detergent, it has higher cost and complex management in use, so it has not been popularized and applied in China

to sum up, gasoline or kerosene is the traditional cleaning agent used to clean printing ink. In order to overcome its flammable and explosive shortcomings of polluting the environment, people have developed a variety of new printing ink cleaning agents, including mixed solvent, oil in water emulsion and semi water-based cleaning agents, which not only basically maintain the strong cleaning ability of the original solvent to the ink, but also overcome its flammable and explosive shortcomings to a great extent. The water-based cleaning agent is completely non combustible, but the cleaning effect of some inks is not ideal, so it should be selected according to actual needs in use

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