Distribution And Printing Process Of Textile Light Storing Printing Paste

commonly Printed fabric The pattern will not display light, but in the costume, evening dress and decorative cloth, it will require the effect of gleaming on the patterns. This printing is called Photoluminescence printing 。 This kind of luminous clothing has special warning function and special artistic effect. For example, many singers and dancers singing on the stage of literature and art have put on this kind of luminous performance costumes, and the colorful lights have hit the singer's body, so that the lighting clothing can fully absorb the illumination of stage lighting. Then the stage lights suddenly disappear and the theater is dark. Only the luminous clothing of the singer is still shining and shining. The beautiful and magical luminous effect is refreshing, and the luminous color is like a dream. The luminescent printing, luminous printing and fluorescent printing have been introduced in some books and periodicals in the past. They have been comprehensively discussed as special printing techniques. They are not as good as green dragonflies, and are poor in operability. They are difficult to satisfy the friends who are interested in luminescent printing.

In 1609, Brand discovered white matter in the air, named it phosphor. Since then, inorganic luminescent pigment is called phosphor, and its meaning has not changed since then. Sometimes it is also called luminescent powder. Luminescence is divided into two types: phosphorescence and fluorescence. Phosphorescence is derived from phosphor. It refers to the phenomenon of prolonged luminescence after excitation. The long afterglow material introduced in this paper is a typical phosphorescence. The term fluorescence refers to the short duration of the afterglow, which generally refers to the phenomenon of negative 8 second seconds less than or equal to 10. Nowadays, people usually do not make strict distinction between fluorescence and phosphorescence. They call fluorescence time short enough to be separated by human eyes.

The production and application of long afterglow luminescent materials began only in the early twentieth Century. The need for military and air defense in the second world war also promoted the development of research and application of such materials, but all these materials were sulphide series. Before 1970s, no sulphide luminescent materials were reported. For this reason, although there are some brief descriptions of the long afterglow properties of aluminate system, it is not until 90s that the aluminate system luminescent material, which is better than sulfide, has been formally introduced. It is known as the second generation long Yu Huiguang luminescent material. Long afterglow phosphors are a kind of luminescent materials that absorb the excited light energy and store them, and then release the stored energy in the form of light, and can last several or even more than ten hours after the excitation of light stops. The process of absorption, luminescence, storage, re luminescence and infinite repetition is similar to that of mobile phone batteries used by us. The repetition of charging, generating, recharging and redischarging is similar. It is suggested that long afterglow luminescent materials should be referred to as light storage luminescent materials. On the whole, the rare earth activated alkaline earth aluminate has the most excellent afterglow characteristics, which is more than 10 times higher than that of the traditional ZnS, Cu and Co luminescent pigments. After irradiating 10min with low illumination, the luminescent 12h can be sustained. The material is non-toxic, non radioactive, harmless and safe for human body. No volatile gas generation, unlike other radiant materials harmful to human radiation, is a rare "green" good material. According to relevant information, in 1993, when the terrorists made an explosion in the underground parking lot of the world trade center, when the world trade building was repaired, the light-emitting materials produced by China's Dalian Lu Ming group were used to rebuild the escape system of the building. When the "9.11" incident took place in 2001, the building's self lit safe evacuation instruction system from Dalian, China, played an important role in the powerhouse, smoky, darkened corridors and at least 18 thousand people in 1.5h successfully managed to escape from two 110 storey skyscrapers. American fire experts believe that this is a miracle created by the Chinese in the East. At present, many large international airports, subway, world-famous buildings, and even the The Pentagon of the United States have been renovated, and all the corridors inside the building have been painted with a 12Ccm wide and long 28km light storage evacuation system. Therefore, the special significance of the application of this light storage luminescent material in textile special printing is self-evident. Here's how to use it. Luminescent printing paste Fabric printing.

　 Luminescent printing paste:

Composition and preparation of light storage luminous printing paste:

There are two problems in the application of light storing luminescent materials to fabric printing.

(1) protection and self stability of light storing luminescent materials.

(2) the combination of light storing luminescent material and fabric forms a uniform pattern of flower pattern.

Although the photoluminescence printing paste is made of light storing luminescent material and transparent printing paste. However, the requirements for printing paste components should be adhesives, thickeners, auxiliaries and additives, which have no effect on light storage materials. Aluminosilicate, silicate and sulphide system light storage materials are safe for human body and environment. If the rare earth aluminate light storage material is easy to hydrolyze, it is best to use the special emulsified paste prepared by standard white fire oil (similar to the A paste) when printing the printing paste. The printing feels soft and fastness, and the adhesive with good diaphaneity is compatible. If the rheological properties of the printing paste are changed due to the addition of light storage pigment, oil rheology modifier and hand fastness regulator can be added to obtain the best printing effect. The light storing printing paste is an oil phase system printing paste. Therefore, the thickener paste synthesized by the whole aqueous phase system can not be used to modulate the printing paste in the paste principle. Because the price of the light storage material is more expensive, it will affect the luminous effect due to the loss of partial hydrolysis.

The biggest drawback of aluminate materials is poor water resistance, which leads to the decrease of luminous properties and even the complete loss of luminous function. When waterborne sizing is used, the surface coating treatment of light storage materials (i.e., microencapsulation of luminescent materials) can be done first, thus improving its water resistance. Furthermore, from the consideration of compatibility, neutral or alkaline transparent printing paste should be used to modulate together with light storage materials. The modulation method is to mix the paste - adhesive - continuously variable emulsifier in a clean stainless steel container at high speed and stir into homogenized mixture at high speed.

Before printing, according to the content of light storage material 20~25% (quality), add the above slurry, and then mix it with medium speed and mantle speed to make printing. Do not beat beating when mixing evenly, so as not to affect the luminous effect.

　 Two. Application of light storage printing technology.

Printing equipment and pattern selection:

The printing equipment is widely used for printing, such as manual cold plate, flat screen and screen printing machine. Flat screen printing is due to the large volume and brightness of the printing paste on the surface of the fabric, and the use of web printing should slow down the speed and select the appropriate scraper shape and scraping pressure. In short, the aim is to achieve a higher pulp yield, so that the printing fabric has a higher luminance. For screen screen cloth, it is generally advisable to use 60~80 mesh. The pattern design is based on dot and small block area or 0.3~0.5cm wide grid. For example, all kinds of small animal patterns are printed on the eyes of animals with light storage paste. After the night, the eyes will sparkle and increase the artistic charm of fabrics. For plant design, it is possible to print light storage paste on its small flowers or flower cores, and the effect at night is also very interesting.

　 Three. Note when using light storage printing paste.

(1) the screen printing with 80~100 purpose is better.

(2) the luminescent printing pulp should be used now. In the process of mixing, we should avoid mixing strong electrolytes and heavy metal ions, so as to ensure the quality of the slurry.

(3) the best luminescent printing paste should be used in 8 hours.

(4) if you use common printing with other dyes or paints, attention should be paid to the arrangement of color plates or coloured positions of the printing paste. The general dye or paint color position is prior. After storing the luminous printing paste, the light storing printing paste can not be superimposed on other printing pastes, otherwise the luminous effect will be affected.

(5) the color of the fabric has a great influence on the luminescence. If the brightness of the white color printing is 100, the brightness of the light color printing is only about 80~90, and the brightness of the deep color printing will be less than 80. The main reason is that the light reflection of white or light colored fabric is stronger than that of the deep dyed fabric. The deep color absorbs the light of some of the luminescent materials, so the luminance is reduced. When the substrate is a non white printing material, a white printing paste should be printed on the substrate before printing the light layer, so that the luminous effect can be guaranteed.

(6) printing on fabric can adjust the minimum film thickness of the luminous layer not less than 100 microns by adjusting the viscosity and reasonable printing method of the light storing printing paste. It is advisable to use 130 microns. For this reason, the thick plate plate plate can be used to ensure the thickness of the film, so as to achieve the best luminous effect.

In a word, photoluminescence printing is a high value-added printing method. If we can develop innovative patterns and designs from the perspective of novelty and novelty, it will be very promising to guide the market consumption.