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The function and classification of 1, lubricant
Application of paper coating lubricant can be traced back to the beginning of this century. Then the paper pigment coated adhesive is mainly animal glue or casein, very low solid content coatings. The adhesive has good adhesive force and has excellent water retention properties, but the formation of the film is very crisp, and the objective need to add a can improve the resistance to bending and bending properties of the additive coated paper and paperboard. The mobility of these additives also improved wet paint and levelling property. This class is on the wet paint work, and doing plays the role of additives in the coating, was once regarded as "increasing additive plasticizer", which is to be discussed in this paper the lubricant.
The lubricant function with the different kinds of paper and paper mill production habits differences and different. Sometimes with some properties of the coating liquidity and coated paper (such as gloss, smoothness, oil absorption, surface strength) properties to evaluate lubricant. Some categories in the lubricant has the function of special characteristics, such as usual was included in the "viscosity adjusting characteristics", "improvement of dry friction resistant", "wet adhesion improvement", "improve the wet rub resistance", "ink gloss and impermeable", "plasticity", "folding" and "improved properties such as gloss". Following the ideal performance of the lubricant should be displayed:
(1) the lubricating coating and improve its flow characteristics;
(2) ensure more smooth coating;
(3) improve the gloss of coating products;
(4) improve paper printability;
(5) reduction of paper folding when the crack and peeling coating;
(6) to reduce or eliminate the phenomenon of powder fall in the super pressure light;
In no need of external processing order case, fine finishing for some paper grades used mechanical pressure light. Chemicals for coating lubricants summarized into the following eight:
(1) the insoluble metal soap dispersion;
(2) water soluble soap;
(3) of sulfuric acid sulfonation or oil;
(4) fatty acid ester;
(5) wax, polyethylene or other hydrocarbon emulsion;
(6) fatty amine or amide (synthetic wax) class;
(7) of polyethylene glycol and glycol ethers;
(8) lecithin soybean "oleic acid mixture.
The various types of lubricants, metal soap water dispersion, wax emulsion with high solid content, calcium stearate lubricant mixture, is the most commonly used lubricants coating; sulfated or oil sulfonated minerals and some natural or synthetic wax dispersion is mainly used for pigment free system, such as a paper or paperboard surface required a single slip characteristics of the occasion; lecithin "soybean oleic acid mixture is a kind of lubricant of the latest.
The composition and characteristics of 2 main varieties, lubricant
2.1 insoluble metal soap dispersion
The insoluble or low solubility of metal soap by alkali metal or oxide with fatty acid or soluble soap reaction and. Alkali metal soap including calcium, manganese, magnesium, aluminum, zinc salt of stearic acid, palmitic acid salt, ricinoleic acid salt. The calcium stearate lubricant long-term occupy an important position in the field.
The typical calcium stearate preparation is made of CaO Ca (OH) 2, and stearic acid reaction from the animal or marine or other vegetable fat or oil in the produced. Calcium stearate manufacturing can also use calcium hydroxide from dissolved soap (such as sodium stearate) precipitation. The prepared calcium stearate by this method, the sizes and shapes (crystal) can be controlled. Calcium stearate dispersion makers improved their products, can now sell has low viscosity, high solid content (57%), passed through a 325 mesh sieve, sieve residue is less than the "." stable products 1%. Calcium stearate dispersion usually with high shear equipment manufacturing. With 3%-5% nonionic or anionic surfactant as dispersant in the finished product. Calcium stearate dispersion over the years has been to maintain the main coating lubricant status. It is economic, practical, in the anti dusting exhibits excellent performance.