1.Touch optimization: the pursuit of softness and fullness In view of the frequent skin-to-skin contact of fabrics, the primary goal of the design of waterborne polyurethane coatings is to achieve soft touch and full form. This requires us to carefully balance the ratio of hard and soft segments in the formulation adjustment, while carefully selecting the types of both to ensure that the coating retains the necessary support without losing its fineness and comfort. 2.Heat stable: stick to high temperature Considering the high temperature environment that fabrics may encounter during processing, transportation and use, waterborne polyurethane coatings require excellent heat stability. This means that under high temperature closed conditions, the coating can maintain its original form and function, non-adhesion, non-deformation, to ensure product quality. 3.Strong adhesion: tight combination of coating and substrate As a functional coating and adhesive, the adhesion between the waterborne polyurethane coating and the substrate fabric is very important. Only by ensuring that the coating can be firmly attached to the substrate can it give full play to its various performance advantages. 4.Solvent resistance: The ability to resist erosion In the face of potential threats from solvents such as daily washing and alcohol, waterborne polyurethane coatings need to have excellent solvent resistance. Through the use of advanced technical means, such as sealing hydrophilic groups, the introduction of curing agent crosslinking, improve the water resistance and solvent resistance of the coating to ensure that the coating remains stable in complex environments. 5.Color persistence: The performance of color fixation When the waterborne polyurethane coating is combined with the color paste to give rich color to the fabric, its color fixing performance becomes an important index to measure the coating quality. The high-quality coating ensures that the color is firmly locked to the fabric, making the fabric colorful and long-lasting. 6.Waterproof and moisture-permeable: dual function of balance Although the coating treatment has a certain impact on the moisture and air permeability of the fabric, the water-based polyurethane coating can improve the moisture permeability of the fabric while maintaining the waterproof performance, and achieve a good balance between waterproof and air permeability by introducing innovative technologies such as hydrophilic groups. 7.Superhydrophobic exploration: Implications for nature Inspired by the superhydrophobic phenomenon of lotus leaves, waterborne polyurethane coatings are gradually moving into the field of superhydrophobic. By imitating the special structure of the surface of the lotus leaf, a coating with super hydrophobic properties has been developed to bring unprecedented protection to the fabric. 8.Efficient preparation: Advantages of high solid content and low viscosity coatings The development of water based polyurethan...

Pigment is the main component of ink, is a fine powder-like solid colored substance, can show ball, flake and other irregular shape. Generally, the diameter of pigment particles is in the range of several hundred nanometers to tens of microns (10-7~10-5m). The pigment can be evenly dispersed in the medium, but it is insoluble in the medium and does not react with the medium. Pigment is a colored body, it gives the ink color, at the same time, its dispersion, aggregation and directly affect the fluidity of the ink, chemical stability and dryness. Ink factory pigment selection error or improper use of ink, will cause a lot of quality problems, pigment caused by quality problems, do the following analysis, for the reference of peers. First, classification of pigments Pigments can be divided into inorganic pigments and organic pigments according to the characteristics of compounds. In organic pigments, they can be divided into lake pigments, color pigments and pigment dyes according to different molecular aggregation states. According to the different molecular structure, it can be divided into azo pigments and phthalocyanine pigments. According to the color characteristics, it can be divided into color pigments (such as yellow, magenta, green, etc.) and achromatic pigments (such as black, white, gray). Quality problems caused by pigment problems 1. Knife line problems caused by pigments 1)The pigment of the ink itself is badly ground, resulting in hard particles. (General ink fineness requirements ≤15μm). 2)When the ink is used for a long time, the resin wrapped in the pigment is missing, and the coarse particles produced by the pigment particles are clumped, condensed, and returned. In addition, the ink factory uses a carrier of color lake pigments, such pigments are soluble dyes precipitated with a precipitant, and then dyed on the high dispersion of aluminum hydroxide, barium sulfate, aluminum barium white and other carriers. This kind of ink will be used for a long time will wash away the dye, carrier separation, carrier clumping. Solution 1)Turn upside down and shake the new ink before opening the bucket. 2)The new and old ink is filtered with more than 100 mesh filters before entering the ink plate. 3)The ink that has been used for a long time is found to have floating pigments on the surface of the ink plate, indicating that the resin is not enough, and the ink mixing oil should be added for sufficient mixing and dispersion. It is best to mix the old ink with a dispersion mixer, and the printing plant can prepare a simple dispersion mixer. 2.Pigment caused by poor ink temperature resistance, high temperature cooking or bag hot press after discoloration Cause analysis The ink factory used the wrong pigment, the use of non-temperature resistant pigment. The printing factory used the wrong ink, and the ink that did not withstand temperature was used on the products of high temperature cooking bags. Solution When purchasing ink, we should check t...

Paper aluminum-plastic composite film in the actual application of medical packaging powder, granule packaging products compared to the plastic aluminum-plastic packaging commonly used in the market now has the following advantages: (1)The mechanical strength of the paper is high, the rigidity is good, and the ability to maintain the bag after forming is strong, which improves the cleanliness of the product appearance; (2)Automatic packaging does not need to be easy to tear, with good easy to tear effect; (3)Due to the high mechanical strength of the paper, when filling and sealing on the automatic packaging machine, it has a good resistance to the shear external force damage when sealing, and protects the aluminum foil from thermal sealing compression and compression break, which further ensures that the barrier performance of the middle layer aluminum foil is guaranteed. In front of the market, the main application of paper aluminum-plastic structure of drug packaging with composite film paper, aluminum, plastic, its main technical indicators are: 1.Appearance There shall be no perforation, foreign body, odor, adhesion, separation between composite layers and obvious damage, bubbles, wrinkles, dirt and other defects. The heat sealing part of the composite bag should be smooth and without virtual sealing. 2.Water vapor transmission The test temperature was 38℃±0.6℃, the relative humidity was 90%±2%, and the water vapor transmission was less than 1.5g/ (m²·24h). 3.Oxygen transmission The heat surface is towards the oxygen low pressure side, and the test temperature is 23℃±2℃, and the oxygen permeability is ≤3.0cm³/ (m²·24h·0.1MPa). 4.Peeling strength of inner layer and sub-inner layer: ≥ 2.5N / 15mm 5.Heat sealing strength: ≥ 12N / 15mm 6.Residual solvent The total amount of residual solvent shall not exceed 5.0mg/m², of which the residual benzene solvent shall not be detected, and the detection limit of a single benzene solvent is 0.01mg/m². First, roughness test of printing surface On the packaging of finished products, will be printed with a clear pattern and logo. However, we will also find that the printing on some materials (especially paper or paper film) packaging is fuzzy, some is related to the quality of the ink, the color process, but a large part is related to the roughness of the printing surface. Since the general printing ink layer is only tens of microns thick, if the printing surface roughness is too large, then the printed ink layer will be embedded into the deep layer of the material, so that the ink layer thickness on the surface is not uniform, which will produce the phenomenon of paste and white. We should be printed surface roughness test, by simulating the conditions of the printing press to measure the surface roughness, from the microscopic point of view to examine the smoothness of the material on the printability, according to the results of the roughness, according to 2 to 2.5 times to adjust the thickness of the ink...

①The residual ink is converted into gray black ink According to the principle of color science, the complementary color of the ink mixed together, its hue will become gray black (red + green, yellow + blue-purple). Therefore, we can use this principle to deploy the complementary ink into gray-black ink by deploying the special color ink, and add it to the black ink in a certain proportion to use it as black ink. In the operation, it is necessary to note that even the remaining oil belongs to the deployment of spot color ink, so there will be a certain color bias, and at this time, the complementary color of the biased color should be added according to the color bias. This method is not suitable for the conversion of light-colored ink, and should consider the composition of the ink, in accordance with the principle of similar mixing reasonable use. ②The residual ink is converted into a similar color ink The color of the ink can be divided into gray, black, white, magenta, red, yellow, green, blue, blue, purple, etc., and other colors can be changed from these basic colors. Therefore, even if there are thousands of products, countless colors, can be classified according to the basic hue. Moreover, there are many similar colors in many colors, and even the color is basically the same. Water-soluble and solvent-based inks, in particular, are more suitable for this method because of their convenient mixing and easy filtration. ③Conversion according to ink formula First of all, we must unify the form of ink formula, preferably in percentage form. Because the percentage formula is used, it is more helpful to compare the formulations, so as to find the correlation of ink color, and can easily identify the degree of color deviation between different formulations of ink to determine whether it can be converted to each other. Using this method, we need to do a good job of sorting, classifying and archiving the formula, so that it is more convenient to find the ink formula of similar hue in use ④According to the ink color card conversion This scheme is generally used for the conversion of ink with unknown ink formula, and the ink color card can be made by scraping or printing in order to analyze the composition of the ink. It can also find similar colors of ink according to the color of the ink color card, so that the remaining ink is converted into the corresponding color of ink according to the allocation method of the special color ink. The method of using residual ink conversion seems easy, but it requires the operator to have rich knowledge of color science and use it flexibly. Printing houses should usually pay attention to the establishment of ink formula, color cards and corresponding identification files, so as to quickly and accurately use the remaining ink, thereby reducing ink loss, reducing waste, and saving costs. Sinograce Chemical has the production of a variety of ink water-based resin, welcome to consult.