When we explore the chemical (reaction) category, we find that when the stoichiometric concentration reaches a certain value (strictly speaking, a very narrow concentration range), various macroscopic properties will suddenly change. From the microscopic point of view, the active molecules of the ink system begin to associate and form aggregates of unequal size. Such aggregates are called micelles or micelles, also known as associative colloids. An important characteristic of micelles is the result of their solubilizing action, which greatly increases the solubility of the originally insoluble or slightly soluble material - commonly known as bloating. This speeds up the chemical reaction. The mechanism of the reaction is likely to have a close relationship with the binder, especially the pigment dispersion process.
Second, eliminate swelling, to avoid the effective way of gel In addition to the reasons mentioned above, the driers in the ink system can also directly affect the viscosity of the ink in the storage process, increased growth and pigment, filler precipitation. For example, a highly viscous alkyd resin is ground with a basic pigment zinc oxide and driers to promote gelation and swell of the ink during storage. This is due to the reaction of free fatty acids and basic pigments during thermal processing. Therefore, in the production of inks using high viscosity ink materials, lead, cobalt, and manganese driers should not be added during the grinding process. However, after adding 1% benzoic acid, the tendency to swell can be reduced. Another drawback of driers is that they can accelerate pigment precipitation during storage. For example, when titanium dioxide is used to make inks, zinc naphthenate is added during grinding, and the pigments tend to precipitate and form a lump.
In recent years, people have proposed such remedial measures in terms of swelling, gelation, and sedimentation around packaging printing inks. The solution to this problem is often caused by the appearance of faults. This method of passive operation not only increases the production costs and delays of the packaging and printing manufacturers, but also brings with it certain processing difficulties. The phenomenon of gelation, thickening and blocking of the ink system is related to the reaction of the salt-based pigment with a higher acid value or a binder containing free fatty acids to soap. The binder itself agglutinates, the ink system absorbs moisture, the pigment content is too high, the binder and the pigment used are not balanced (inappropriate), the adjuvant of the binder and grease is poorly miscible, and the polymer binder is acid Absorption of dissolved structures by pigments can lead to gelation of the ink. The general remedies are nothing more than the following four methods:
1. When it is too thick or the gelation occurs due to the high degree of polymerization of the linking material, dilute with aliphatic hydrocarbons, esters, and ketones.
2. React to gelatinized inks. Rosin is dissolved in linoleic oil and its high acid content is used to relieve it.
3. Add naphthalic acid metal salts to the packaging printing ink.
4. The ink needs to add inorganic salt, can control the gel.
By analyzing the ink formulation structure and combining many years of practical experience, the author believes that the improved phosphate ester titanate coupling agent produced by Yizheng Tianyang Chemical Factory (National Inspection-Exempt Product) not only has excellent dispersion properties for pigments, but also To make swollen, gelatinized packaging printing ink "rejuvenated." For example, in the printing process, only 3% to 5% of the anti-expansion breaker needs to be added to the swelled ink, so that the above failure can be controlled and the original structure and viscosity of the ink can be restored. According to the characteristics of the anti-expansion breaker produced by Yizheng Tianyang Chemical Plant, we only need to add 1.5% to 2.5% anti-expansion breaker to the pigments and fillers in the ink formulation to avoid bloated packaging and printing. Gelatinization.
It is also possible to use toluene, xylene in a ratio of 1:1 to dilute with the product first, and then add the ink in the ink to grind and disperse together, which can not only greatly improve the dispersibility of the pigment, but also prevent the packaging printing ink from being produced and stored. In the printing process, due to swelling, gelation, precipitation, resulting in streaks or color fading. At the same time, the degree of branching of the ink can be greatly increased to increase the attachment fastness of the ink film, and the baking temperature and the blowing amount of the printing ink or the volatile drying type (solvent type) printing ink can be reduced, thereby effectively promoting the normal printing of the packaging printing ink. Printing fluidity. (Finish)
Printing ink off roller (2)
January 24 16:03:39, 2019
Product Specifications/Features :
1.Material:handmade glass
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. Material: metal
. Size: 100*100*H250mm
. Minimum Order Quantity: Standard 150 Piece/Pieces per item. Can be discussed on a case-by-case basis as well.
. Place of Origin: China
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