Polyamide resin refers to a high molecular polymer having a -N-C-O structure in its molecular chain. The polyamide resins used in the ink industry and the polyamide resins used in the chemical fiber industry have completely different performance requirements. The polyamide resins used in the ink industry use dimer fatty acids as monomers and produce different properties through several modification methods. The resin products, but generally divided into two categories, one is a benzene-soluble polyamide resin, which is mainly used in surface gravure inks, and the other is an alcohol-soluble polyamide resin, but at present most manufacturers provide polyamide resins. The alcohol solubility is not good, need to add a certain amount of aromatic solvent to improve its alcohol solubility, and at a certain temperature there will be freezing phenomenon. The above features have limited the scope of application, but in modern societies where the concept of environmental protection is increasing, the alcohol-soluble polyamide resins with excellent properties will be used to broaden the scope of applications, thus accelerating the development of alcohols with better performance. Amide resin is very practical. After years of research and development, our company introduced two mature pure alcohol-soluble polyamide resins in the second half of 1999, which are good in terms of leveling, refreezing performance, or adhesion strength, and have no freezing phenomenon; Cotton has good miscibility.
The alcohol-soluble polyamide resin is mainly used as a rubber letterpress ink in applications, and has a good adhesion to various printing materials, especially a printed polyolefin film. The leveling property, gloss, and solvent release property of the ink are all It is better to use with heat-resistant nitrocellulose, cellulose vinegar, etc. to improve its heat resistance, finger resistance, and friction resistance; at the same time, it can improve the adhesion between the ink and the substrate. Also add some wax, antistatic agents and other auxiliary agents, it can further improve its printability. Secondly, when the alcohol-soluble polyamide resin is used to modify the acetic acid resin, a highly thixotropy and a very small flowable colloidal substance can be obtained, which can be used as a binder for high-speed printing ink, and can also be mixed with linseed oil to form a colloidal oil. Used for offset printing inks. In addition, alcohol-soluble polyamide resins with high gloss and adhesion strength can also be used to make varnish. There are also ink manufacturers blending alcohol-soluble polyamide resins with benzene-soluble polyamide resins for use as surface gravure inks for better printing results. In addition, according to the guidance, some foreign companies have successively introduced to the market alcohol-soluble polyamide resins with good reproducibility and achieved market acceptance. It can be seen that with the continuous advancement of science and technology, alcohol-soluble polyamide resins will surely be obtained. A broader market outlook.
Recycling of waste paint
Solvent-based paint spraying, according to theoretical calculations, 45-50% will be sprayed on the metal surface, and 55-50% of the paint by the water leaching method drop pool (floating flocculant obtained waste paint). Because the paint is an organic polymer, the carbon of the polymer is sticky and cannot be burned so as not to pollute the atmosphere, and it cannot be dumped arbitrarily. One is contaminated land, and the other is likely to cause fire. In addition, waste paint itself is a kind of resource. How to turn waste into treasure is not only of concern to the Chinese people, but people in the world who specialize in material protection are also concerned.
With the cooperation of many colleagues, universities and research institutes in China, the author designed a new type of biological solution, which can regenerate various water-soluble and solvent-based waste paints into original paints.
The process flow is as follows:
First of all, a variety of grades of waste paint separately renewable, must not be mixed and need to have no driers, non-drying curing various amino, alkyds, propylene, polyester, nitro, phenolic Polyurethanes, polyurethanes, and epoxy waste paints, dry, thin, old and new, can be recycled. Put the above waste paint into one or two rectangular water tanks first, and add 25 as a ratio of 1:2 (slag: water). C-40. The water between C, while adding a certain amount of special additives, soak 30-40h, such as waste paint obtained after the addition of flotation flocculant, then add certain additives when soaking, adjust the PH value, and then remove the paint After dehydration and special treatment, the solvent is added, grinding, stirring, high-speed dispersion, removal of mechanical impurities, foreign matter particles, coarse miscellaneous oil residue, refined after grinding to achieve less than 40um accuracy, coated 4 cups 50-60 The viscosity of the second, and then added stabilizers, leveling agents, anti-settling agents, brightening agents, defoamers, anti-skinning agents and so on. When using the new paint, it can be dried, and it can also add single or two-component auxiliaries to form a self-drying type. Once the gloss is found to be poor, you can add a certain amount of gloss improver, this paint can be widely used in auto repair shops, trunks, beams, trailers, trailers, agricultural machinery, livestock machinery, small transport vehicles, ships, bridges, internal and external walls Such as coating, the general physical and chemical indicators can be close to the new paint, but the cost is only half of the new paint.
Source: China Ink Web
The alcohol-soluble polyamide resin is mainly used as a rubber letterpress ink in applications, and has a good adhesion to various printing materials, especially a printed polyolefin film. The leveling property, gloss, and solvent release property of the ink are all It is better to use with heat-resistant nitrocellulose, cellulose vinegar, etc. to improve its heat resistance, finger resistance, and friction resistance; at the same time, it can improve the adhesion between the ink and the substrate. Also add some wax, antistatic agents and other auxiliary agents, it can further improve its printability. Secondly, when the alcohol-soluble polyamide resin is used to modify the acetic acid resin, a highly thixotropy and a very small flowable colloidal substance can be obtained, which can be used as a binder for high-speed printing ink, and can also be mixed with linseed oil to form a colloidal oil. Used for offset printing inks. In addition, alcohol-soluble polyamide resins with high gloss and adhesion strength can also be used to make varnish. There are also ink manufacturers blending alcohol-soluble polyamide resins with benzene-soluble polyamide resins for use as surface gravure inks for better printing results. In addition, according to the guidance, some foreign companies have successively introduced to the market alcohol-soluble polyamide resins with good reproducibility and achieved market acceptance. It can be seen that with the continuous advancement of science and technology, alcohol-soluble polyamide resins will surely be obtained. A broader market outlook.
Recycling of waste paint
Solvent-based paint spraying, according to theoretical calculations, 45-50% will be sprayed on the metal surface, and 55-50% of the paint by the water leaching method drop pool (floating flocculant obtained waste paint). Because the paint is an organic polymer, the carbon of the polymer is sticky and cannot be burned so as not to pollute the atmosphere, and it cannot be dumped arbitrarily. One is contaminated land, and the other is likely to cause fire. In addition, waste paint itself is a kind of resource. How to turn waste into treasure is not only of concern to the Chinese people, but people in the world who specialize in material protection are also concerned.
With the cooperation of many colleagues, universities and research institutes in China, the author designed a new type of biological solution, which can regenerate various water-soluble and solvent-based waste paints into original paints.
The process flow is as follows:
First of all, a variety of grades of waste paint separately renewable, must not be mixed and need to have no driers, non-drying curing various amino, alkyds, propylene, polyester, nitro, phenolic Polyurethanes, polyurethanes, and epoxy waste paints, dry, thin, old and new, can be recycled. Put the above waste paint into one or two rectangular water tanks first, and add 25 as a ratio of 1:2 (slag: water). C-40. The water between C, while adding a certain amount of special additives, soak 30-40h, such as waste paint obtained after the addition of flotation flocculant, then add certain additives when soaking, adjust the PH value, and then remove the paint After dehydration and special treatment, the solvent is added, grinding, stirring, high-speed dispersion, removal of mechanical impurities, foreign matter particles, coarse miscellaneous oil residue, refined after grinding to achieve less than 40um accuracy, coated 4 cups 50-60 The viscosity of the second, and then added stabilizers, leveling agents, anti-settling agents, brightening agents, defoamers, anti-skinning agents and so on. When using the new paint, it can be dried, and it can also add single or two-component auxiliaries to form a self-drying type. Once the gloss is found to be poor, you can add a certain amount of gloss improver, this paint can be widely used in auto repair shops, trunks, beams, trailers, trailers, agricultural machinery, livestock machinery, small transport vehicles, ships, bridges, internal and external walls Such as coating, the general physical and chemical indicators can be close to the new paint, but the cost is only half of the new paint.
Source: China Ink Web
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