Waterborne polyurethane (WPU) is a water-based dispersion material, and its unique low viscosity characteristics often bring construction challenges such as flow hanging and penetration. In order to solve these problems and improve its construction performance, self-leveling performance and storage stability, the addition of thickener has become a key step. The thickener not only endows the water-based polyurethane system with ideal thixotropy and suitable viscosity, but also meets the stability and performance requirements of its production, storage and use in many dimensions. In waterborne polyurethanes, thickeners play multiple roles: first, their associated thickening function can effectively enhance the stability of the system; Secondly, it can precisely control the rheological properties to ensure the smooth construction process; Finally, thickeners also help reduce the settling of pigments or fillers and maintain the uniformity of the paint. Due to the complex structure of water-based polyurethane association thickener, its thickening effect and viscosity performance are also significantly different. According to its characteristics, it can be roughly divided into two categories: pseudoplastic type and Newtonian type. Pseudoplastic thickener adsorbs on the surface of emulsion particles with strong hydrophobic base, which significantly improves the low shear and medium shear viscosity, and its main function is to thicken. The Newtonian thickener, while effectively increasing the viscosity, the improvement of low shear and medium shear viscosity is not obvious, therefore, through structural fine-tuning, this kind of thickener can also be used as a leveling agent. In practical applications, the association thickener selected by waterborne polyurethane mainly includes two categories: 1. Thickener suitable for medium and low shear rate: This kind of thickener gives the surface of waterborne polyurethane a weak pseudoplastic rheological property, making it more stable during construction. 2. Thickener suitable for high shear rate: its rheological curve is closer to Newtonian type, which mainly plays a role at high shear rate (about 10000/s). In order to obtain the best construction results and rheological properties, thickeners suitable for high shear rates and medium to low shear are usually used together. This can not only effectively reduce the flow phenomenon, but also minimize the amount of thickener, to achieve effective control of construction costs.

Paper ink absorption is not only related to the degree of porosity and capillary state of the paper, but also related to the surface properties of the paper fiber, the content of fillers, pigments, adhesives, ink composition and characteristics, printing methods, printing pressure and other factors. In actual printing, the absorption of ink by paper can be divided into two stages. The first stage is the printing press stamping moment, relying on the role of printing pressure to transfer part of the ink to the surface of the paper into the larger pores of the paper, that is, the ink as a whole (including the pigment in the ink) into the paper pores, this process is generally called pressure penetration stage. At this stage, the paper's absorption of ink mainly depends on factors such as the size of the printing pressure, the structure of the paper and the viscosity of the ink. If the printing pressure is large or the structure of the paper is loose, the absorption capacity of the paper to the ink will also be strong. In general, the printing structure of loose paper, such as newsprint, letterpress paper and other non-coated paper, the printing pressure should be smaller, the ink viscosity should also be lower. And paper with tight printing structure, such as coating paper, the printing pressure can be appropriately large, and the ink viscosity can be slightly higher. The second stage is from the paper to leave the imprint area until the ink is completely dry, this stage mainly relies on the capillary action of the paper to absorb the ink, called the free penetration stage. At this stage, the binder is separated from the ink as a whole and enters the inside of the paper at a fairly slow speed through small pores and the rough surface of the paper fibers. Therefore, this process is actually the process of migration of the binder from the ink to the pores of the paper, because the binder is separated from the ink as a whole, it will change the conjunctival nature of the ink film retained on the paper, and the fixation and drying of the ink stain will also be completed in this process. At this stage, the absorption rate of the paper to the ink determines the gloss of the print, and whether it will occur through printing, powder and other phenomena. When the ink is transferred to the paper, over time, the low molecular binder (solvent) will begin to penetrate into the paper layer, so that the solvent content in the ink layer on the paper will decrease, the ink viscosity will increase, and the ink layer will condense. The ink absorption of paper depends on the number of paper capillaries and the size of the capillary diameter. Paper is a porous material, and there are many gaps of varying sizes between fibers and fibers, between fibers and fillers, and between pigment particles inside the paper. These gaps are equivalent to many capillaries. Under the action of these capillaries, the binders in the ink can be absorbed, and the thicker the diameter of th...

Enhance the adhesion of UV ink and UV varnish on paper products! The tape won't come off Fast drying speed to meet the needs of production line Good affinity with UV varnish and UV ink Excellent strength and toughness Water-based UV base oil for high adhesion paper products Anhui Sinograce Chemical waterborne UV primer for high adhesion paper products is a high-performance waterborne coating developed by using the latest environmentally friendly coating technology, which is specially used to increase the printing effect of UV ink and UV varnish on paper substrates. UV curing glazing coatings and UV inks have been rapidly developed in recent years because of their environmental protection and excellent wear resistance and water and oil resistance. However, in the curing of UV photocurable coatings and UV inks, the internal components are cross-linked and polymerized, and the instantaneous change in volume produces a large internal stress, which affects the adhesion of UV ink and UV varnish to the substrate material. Anhui Sinograce Chemical Chemical Co., LTD. 's waterborne UV base oil for high adhesion paper products is a product specially designed for paper, for post printing or UV glazing using waterborne base oil products. Water-based UV base oil for high adhesion paper products is carefully formulated with special functional groups and wetting agents, which can effectively combine with polar groups on the surface of various paper substrates and quickly form a transparent film with high adhesion on the surface of the substrate. On the surface of the substrate with water-based UV primer for high adhesion paper products, UV varnish and UV ink can achieve the ideal adhesion effect, and will not be torn off with tape. In addition, water-based UV base oil for high-adhesion paper products also has the advantages of good film formation transparency and fast drying speed, which plays a role in promoting the development of environmental protection and efficiency in the printing industry. Product Use It is suitable for coating white cardstock, white cow card with grey background, kraft paper and copperplate smooth paper, and color printing UV primer. Product Feature Excellent adhesion, tape does not tear off: The polymer structure of water-based UV base oil for high-adhesion paper products from Anhui Sinograce Chemical contributes to the flow and wettability of molecular chains on the surface of the substrate, making the coating and the substrate molecules in close contact to achieve high adhesion. It won't come off with tape. Anhui Sinograce Chemical high adhesion paper products with water-based UV base oil can play an excellent role in post-sequence printing or UV glazing. Fast drying speed to meet the needs of production line: Anhui Sinograce Chemical high-adhesion paper products with water-based UV base oil drying speed, to meet the requirements of industrial production. Good affinity with UV varnish and ink: Anhui Sinograce Chemical high-adhesion pa...

The OPP,PET film substrate | is an environmentally friendly coating using advanced material technology, which can significantly enhance the adhesion of EVA on difficult PET substrates and improve the product quality of PE card film. Card film, also known as plastic film, is a plastic film product coated with adhesive and OPP and PET as the substrate, which is widely used in the storage and protection of identity cards, driving licenses, and other flake items. After plastic sealing, it has the advantages of waterproof, anti-smear, anti-moth, anti-mildew, anti-corrosion, easy to clean, clear and transparent, neat and beautiful. However, the surface polarity of OPP and PET materials is low, and the adhesive is a polar material, when the two are combined, the adhesion is not ideal. For a long time, in the production of OPP and PET card film, how to solve the adhesion of EVA on the plastic film substrate such as OPP and PET has been a technical problem. The OPP and PET film substrate | of Sinograce Chemical Company has been carefully designed with special functional groups, which can effectively combine with the polarity group after corona treatment on the surface of PP and PET films to produce a coating with high adhesive force, which plays a good role in the foundation of EVA on OPP and PET film substrates. The OPP and PET coating agent | of Sinograce Chemical Company successfully solves the problem that the surface of PP, PE and PET plastic film is difficult to adhere, and provides an efficient solution for the development of high quality and environmental protection of card film products. Product feature Effectively improve the adhesion of pressure sensitive adhesives and OPP and PET substrates: Because OPP and PET plastic films are weakly polar materials, and EVA adhesives are polar materials, EVA adhesives are difficult to attach directly to the surface of OPP and PET plastic films. The OPP, PET film primer | adhesive of Sinograce Chemical Co., Ltd. has special functional groups, which can effectively bond with the polar groups treated by corona on the surface of OPP and PET films to produce a coating with high bonding force, which plays a good role in laying EVA adhesive on the substrate of PET tape. Prevent pressure sensitive adhesive from penetrating into the substrate and improve the coating quality: The OPP, PET coating agent | of Sinograce Chemical Company adopts self-crosslinked resin to provide a physical barrier between the body film and the adhesive, which can prevent the low molecular weight substances in EVA adhesive from penetrating into the film, which is conducive to the long-term stability of the substrate film. Outstanding high temperature resistance: Sinograce Chemical Company's OPP, PET card film substrate | high temperature performance is excellent, will not yellow at high temperature, affect the quality of plastic sealing products. Fast drying speed to meet the needs of production line: Sinograce Chemical Company's OPP, PET ...