The most important application indexes of water-based adhesives in the packaging and printing industry mainly include four aspects: bonding strength, high/low temperature resistance, moisture resistance and viscosity holding.In practical application, defects such as weak adhesion and brittle degumming film are basically caused by the above four application indicators are not up to standard.In practical application, defects such as weak adhesion and brittle degumming film are basically caused by the above four application indicators are not up to standard.When choosing water-based adhesive, quality first and price second should be the principle. However, some packaging and printing enterprises have a one-sided view, mistakenly thinking that the higher the price of water-based adhesive, the better the quality; The other way around, the worse the quality actually, it's not absolute.When choosing water-based adhesives, we should first understand the characteristics of processed products and choose adhesives with higher cost performance, which is a reasonable way to choose and buy. The solid content of modified waterborne polyurethane adhesive sold in the market is generally 15%-35%, which increases the cost of transportation and drying, and affects the bonding property.So how to improve the solid content has become a hot research topic at home and abroad.At present, sulfonates are mainly used as hydrophilic chain extenders in the synthesis of water-based polyurethane with high solid content, and carbonates and carboxylate are also used as hydrophilic chain extenders.By introducing the ionic group (-COOH) to the end of the molecular chain through molecular design, stable waterborne polyurethane with low ionic group content and high solid content is prepared, which also provides a new idea for the development of waterborne polyurethane with high solid content.UV curing modified waterborne polyurethane adhesive with water as diluent, non-flammable environmental protection; And does not contain dilute monomer, is conducive to improve the adhesion of the film to the substrate.So get vigorous development in recent years Natural polymer modified waterborne polyurethane modified, such as nano cellulose fiber is one of the most abundant natural polymer materials in the nature, and nanometer fiber has higher strength of the modified waterborne polyurethane can not only reduce the cost, but also can obtain very good mechanical properties. With economic development, China's annual use of adhesives up to 600,000 tons, more than 90% of solvent-based adhesives, such adhesives contain a lot of toluene xylene butanone acetone ethyl acetate alkane and other organic solvents, the amount of glue accounted for 80% or more of the total weight.These organic solvents have certain toxicity, and some inferior adhesives are even produced with benzene, which is more toxic.These organic solvents have a certain toxicity, some inferior adhesives even use benzene to produce, its mo...

With the improvement of social progress and people's awareness of environmental protection, water-based ink in the field of packaging printing ink has attracted much attention.Water-based ink is more widely used in the fields of paper, food, medicine, packaging and printing because it has very low organic volatile matter (VOCs) and green environmental protection. However, in the field of gravure printing based on polyvinyl chloride (PVC) plastic film material, it has just begun to develop.This is mainly because water-based ink in PVC and other plastic surface packaging printing still has poor color fastness to light poor adhesion poor dry slow packaging printing dark gloss and easy to appear small white spots and other shortcomings, resulting in not all aspects of application and promotion. Water-based ink is water as a solvent or dispersant of the ink, which is mainly composed of linking pigment and additives known as ink heart water-based ink connecting material is the technical key to deal with the above problems.Water-soluble resin linker is the universal linker of water-based ink, which usually selects synthetic resin with high acid value, and then neutralizes into salt through volatile amine reagent.At this stage the study of water-based ink connection material mainly gathered in the synthesis of modified this aspect, such as using butyl acrylate, methyl methacrylate acrylic hydroxyl propyl acrylate and diacetone acrylamide as monomer, adipic acid hydrazide as crosslinking agent, according to the indoor temperature since the crosslinking reactions used in water-based ink water-based acrylic resin was synthesized.The water-based ink prepared from this resin was printed on polyethylene (PE) plastic substrate. The results show that it has the characteristics of low water absorption and good film forming ability and high fastness to adhesion.In addition, there are also many scholars on the thermal stability of water-based ink connectors, water fastness, drying rate, resolubility, hardness, impact resistance, solvent resistance and other properties carried out research. The water-based polyurethane with high solid content was prepared by using small molecular chain extender of diisocyanate and polyester polyol with symmetrical structure, which achieved good water resistance, drying rate, thermal stability and fastness to adhesion.From the current literature, there is little research on the influence of water-based ink connectors on color fastness to light in plastic printing.Although the influence of water-based ink on color fastness to light in PVC edge-sealing strip printing was studied, the factors affecting color fastness to light were not analyzed, and the water-based ink bonding material was not further explored.Therefore, it is of great significance to study the influence of water-based ink connectors on the color fastness to light of PVC plastic printing. Anhui Sinograce Chemical Co., Ltd.(Sinograce Chemical) is mainly engaged in the bus...

Flexo printing ink characteristics: 1 Water-based ink (mainly used for paper printing) Water-based ink is the biggest characteristic, the use of water-soluble or water-dispersive resin as a linker, reduce the discharge of organic volatile matter, it can completely eliminate some toxic substances to the human body and the pollution of packaging goods.Water-based ink makes less investment in environmental protection, no need to set up fire protection device solvent recovery pollution-free discharge device.Water - based ink viscosity stability in use, do not need viscosity control equipment.Printing machine is easy to clean and low cost, strong coloring power.However, the disadvantage of water-based ink is not suitable for film printing, slow drying speed, poor gloss, poor water resistance, affect the paper scalability and corrosion of the printing press. 2 solvent (including alcohol soluble) inks (mainly used for plastic printing) Solvent-based ink is a kind of ink commonly used in various printing methods, with bright color, fast drying speed, good gloss and so on.In recent years, in the packaging printing of plastic film, flexographic printing ink is vigorously promoting the application of alcohol-soluble ink, because alcohol solvent is the least toxic organic solvent, and there is no corrosion and damage to the flexible version.Good alcohol-soluble ink has the advantages of good fluidity, good drying speed, strong adhesion, strong gloss and bright color.Of course, alcohol solvents are harmful to the environment and safety. 3 Flexible UV ink (universal, paper and plastic film can be printed) UV ink is the use of a certain wavelength of ultraviolet radiation, through the photochemical reaction, so that liquid UV ink into solid ink,UV ink features: safe and reliable, no solvent emissions, non-flammable, no pollution of the environment, suitable for food and drink, tobacco, alcohol, drugs and other health conditions require high packaging printed matter.Flexo PRINTING UV ink in the field of instrument packaging in foreign applications for many years, without any problems. Anhui Sinograce Chemical Co., Ltd.(Sinograce Chemical) is mainly engaged in the business of chemical products,such as printing ink.Sinograce Chemical is mainly engaged in the business of screen printing ink and other product series.Good materials, advanced production technology, and fine manufacturing techniques are used in the production of chemical liquids. It is of fine workmanship and good quality and is well sold in the domestic market.Welcome to learn about flexible ink customers, please contact the business email vivisinograce@outlook.com

Water based polyurethane adhesive is a kind of high-grade adhesive, with excellent flexibility, impact resistance, chemical resistance and wear resistance, the most important is its low temperature resistance.It has adsorption and chemical bonding effect on many kinds of materials. It can not only bond porous materials, but also bond smooth surface materials. It is widely used. Polyurethane adhesives have strong adhesion, most water based polyurethane adhesives do not contain NCO group, but there are ammonia ester bond urea bond ether bond ionic bond, so the adhesion of a variety of substrates is strong, good affinity, because waterborne polyurethane contains carboxyl hydroxyl and other active groups, under appropriate conditions can form crosslinking, improve adhesion.The viscosity of waterborne polyurethane is generally adjusted by water-soluble thickener and water, which is easy to operate and easy to clean up the residual glue. Can be mixed with a variety of water-based resins, conducive to improve performance and reduce costs, but pay attention to ionic properties and acid alkaline, to prevent condensation. In addition to the added polymer thickener, the main factors affecting the viscosity of water based polyurethane adhesives are ion charge particle size and so on.The viscosity of water-based adhesives is lower than that of solvent-based adhesives with the same solid content.Due to the poor volatility of water than organic solvents, waterborne polyurethane adhesives dry slowly, and due to the large surface tension of water, the wetting ability of surface hydrophobic substrate is poor, when most of the water is not volatilized into the air from the adhesive layer or absorbed by porous substrate heating and drying, it is not easy to get a continuous adhesive layer.Because most waterborne polyurethane adhesives are made of hydrophilic polyurethane as the main solid component, and sometimes also contain water-soluble polymer thickener adhesives, after drying the film, if there is not a certain degree of crosslinking, the water resistance is not good.In recent years, a great deal of research has been carried out and great progress has been made on problems such as slow drying speed of waterborne polyurethane adhesives, poor wettability of non-polar substrates, low initial viscosity and poor water resistance.The results show that if the solid content is increased to more than 50%, the drying speed is similar to that of common solvent-based polyurethane adhesive at the drying temperature of 40~60.Blends with other emulsions (such as EVA acrylate emulsion, etc.) to form interpenetrating network or graft structure, which can improve the initial viscosity and bonding performance, and reduce the cost. Crosslinking method can improve water resistance and heat resistance.Polyurethane adhesives have the advantages of adjustable softness and hardness, low temperature resistance, good flexibility, high bonding strength and so on. They can bond a variety o...