What is the main function of adding wax emulsion to the thermal paper coating?

The thermal paper coating uses wax emulsion to give the thermal paper excellent waterproof and moisture-proof, increase the wear resistance and smoothness of the coating, improve the anti-grease performance, effectively improve the water repellency, provide high color strength, do not affect the color and appearance of the product at all, improve the wear resistance and smoothness of the coating, and prolong the storage period of the thermal paper. Of course, all products still have to be tested to determine whether they are usable, and practice is the standard to test whether the product is feasible. Our Aoda's wax emulsion can stand the test, choose Aoda's new environmental protection materials, you will not be disappointed.

Thermal coatings are very important in the production of thermal paper, and the chemicals used in thermal coatings are generally composed of more than a dozen kinds of chemicals in a certain proportion. However, each company's heat-sensitive coating formulations are proprietary and vary. Here is a brief introduction to the basic ratio of coatings.

In the formula of heat-sensitive coatings, there are at least: (1) colorless dyes, accounting for a few percent, there are many varieties of the dyes, and the most commonly used is fluorane compounds. Such as:

3-diethylamino-7-o-chlorophenylfluorane, etc. (2) chromogenic agents, accounting for less than 20, commonly used are bisphenol A, parabens. Other common chromogens include:

p-phenyphenol; methylene bisnaphthol salicylate; aromatic sulfonic acid; aromatic sulfides; 2,4 Dihydroxybenzoic acid. (3) Sensitizers, accounting for less than 10, such as benzenesulfonic acid amide compounds. (4) Filler, accounting for less than 50, commonly used is calcium carbonate (particles).

Function: Improve the opacity of the paper and improve the contrast between the imaging and the background color. (5) Adhesive, below 10, such as polyvinyl acetate.

Function: The coating has good surface strength and printing performance, and the adhesive also forms a colloidal protective film between the dye and the chromogenic agent, so that the two are isolated to prevent premature reaction. (6) Stabilizers, accounting for a few percent, such as diphenyl p-phthalate.

7) lubricants, a few percent. It is generally a waxy substance that can be used to prevent sticking of hot heads.

To sum up, the lubricant in the formula is added: the lubricant used by domestic thermal paper enterprises is generally divided into two kinds, one is emulsion, mainly relying on imports, and the cost is higher. It can be replaced by the water-based zinc stearate emulsion produced by Guangzhou Zhenghao New Material Technology Co., Ltd., and the cost per ton is reduced by about 10,000 yuan.

The other is powdery, which needs to be grinded, the grinding fineness is not easy to control, and it is easy to white, which can be used in thermal paper with low requirements.

The main functions of polyethylene wax emulsion in solvent-based coating film are: matting, anti-scratch, anti-wear, anti-polishing, anti-engraving, anti-adhesion, anti-precipitation, thixotropy; Good lubricity and processability; Metallic pigment locality.

The principle of action of polyethylene wax is as follows: polyethylene wax dissolves in the solvent at high temperature, and precipitates when cooled to room temperature, and exists in the coating in the form of microcrystalline, because its thixotropy is conducive to the storage of the coating, and after the application of the coating, it can migrate to the surface layer of the coating film during the solvent volatilization process, and finally form a "waxed" surface layer with other components of the coating.

Polyethylene wax emulsion for wood paints: This type of polyethylene wax emulsion has a small particle size, probably in the tiny range of 10-500 nanometers. When used in wood paint, it has an obvious effect on the improvement of gloss.

PE wax emulsion for ink: the slipping effect of polyethylene wax emulsion has an obvious effect in ink, which can improve the anti-adhesion of the coating, increase the feel of the coating, and make the film better, which is a common model in ink wax emulsion.

In the paper industry, the use of wax emulsion instead of rosin gum can not only improve paper quality but also reduce production costs.

When added to leather finishing agents, it can increase the waxiness and brightness of leather; When added to the color paste, it can also play a leveling role and prevent the coating from sticking when exposed to heat.

Improved plastic flow and mold release: Polyethylene wax improves the flow of plastics in the extruder and the release of the finished product, while the finished product shows better surface properties, longer term stability and more attractive color. Polyethylene wax is used as a lubricant in PVC film, profiles, pipes, and plastic processing industries, which can improve the toughness of plastic products, make the surface smooth and flat, and improve the yield rate.

However, no matter how good the product is, it must be tested to determine whether it is suitable for their own use, our Aoda's polyethylene wax emulsion products can stand the test, choose Aoda's new environmental protection materials, you will not be disappointed. I also believe that I have some help to you, thank you.

Slippery, abrasion resistance, scratch resistance.

The application range of paraffin emulsion is determined by its ionic properties, such as anionic paraffin microemulsifier AMP and cationic paraffin microemulsifier NMP emulsified emulsion, which are stable in alkaline environment and acidic environment respectively, if the paraffin wax in it is adsorbed in the object and shows the characteristics of paraffin, they need to be broken and given the opposite acid-alkali environment, so that the paraffin wax can be deposited on the object from the emulsion, so as to reflect the water repellency of paraffin.

Nonionic paraffin emulsions are stable under acid-base conditions and do not break the emulsion, thus limiting the hydrophobicity of paraffin, but it is more suitable for bright needs.

What is Thermal Paper? Why are most merchants happy to use thermal paper printers?

Ordinary thermal paper is the most widely used in cashier receipts.

The common use of the cash register system, the cash register receipt, the cash register paper and the receipt machine are indispensable! Thermal paper is a special kind of coated processed paper, which is similar in appearance to ordinary white paper.

The surface of the thermal paper is smooth, and after the thermal paper is heated, the colorless dye reacts with the chromogenic agent to produce color, which is displayed when the merchant prints with a thermal printer.

Since there are many varieties used as colorless dyes, the color of the handwriting is different, such as blue, fuchsia, black, etc. In other words, thermal paper is a special coated paper that gives energy and heat energy to the surface of the paper, so that the physical or chemical properties of the substance chromogenic agent change and the image is obtained.

Due to the development of electronic communication industry, thermal paper is not only popular in the form of fax paper in individual households, but also widely used in various fields such as commerce, supermarkets, banks, hospitals, airports, etc., with increasing varieties and a wider range of applications.

Thermal label printing paper is an ordinary thermal paper introduced to the label field in recent years, and it has developed rapidly, and merchants usually use thermal paper for labels and bills. It is a product that combines heat-effective paper with self-adhesive labels. Self-adhesive adhesive is applied to the back of hot washi paper and laminated on anti-stick paper for the label to be printed.

It is more widely used in supermarkets, tea shops, clothing labels and other industries. Thermal label printing paper is more applied to label printers, and label printers should be distinguished from ribbon printing or thermal printing, or dual-mode printing when purchasing, that is, both thermal printing and ribbon printing!

Thermal label paper.

Thermal label paper.

Most of the merchants who use the cash register system, thermal printers have become the standard. The biggest advantage of thermal printers is that the cost of consumables is low, and there is no need for corresponding ribbons, grinding powder and other consumables, which greatly reduces the cost of use for the subsequent use of merchants, so it is favored by merchants! According to the different interfaces, the small ticket machine is divided into U port, serial port and network port, as well as Bluetooth connection!

And there is a small ticket machine sea with voice function!

Shenyang Mick Technology is committed to providing store management solutions in the field of merchant services.

Thermal paper is also known as thermal fax paper, thermal recording paper, thermal copy paper, and in Taiwan, it is called thermal copy paper. Thermal paper is a type of processed paper that is manufactured by applying a layer of "thermal paint" (thermal chromic layer) to a high-quality base paper. Although there are more than a dozen chemicals used in this discolored layer, at least the following compounds are present:

Colorless dyes, which have a wide range of varieties, are fluorescent compounds that are commonly used; The chromogenic agent accounts for less than 20%, and the commonly used ones are bisphenol and para-hydroxybenzoic acid; Sensitizers account for less than 10%, which contain benzenesulfonic acid amide compounds; The filler accounts for less than 50%, and calcium carbonate (particles) is commonly used; Adhesives account for less than 10%, such as polyvinyl acetate; stabilizers, such as diphenyl p-phthalate; lubricants, etc. Therefore, the process is difficult and the technical requirements are high.

Thermal paper The principle of making thermal paper is to coat the ordinary paper base with microparticle powder, the composition is colorless dye phenol or other acidic substances, separated by a thin film, under heating conditions, the film melts, and the powder is mixed to develop a color. The handwriting on the thermal paper is unstable and easy to fade, making the content of the document illegible.

The role of thermal paper:

As a communication carrier for text and graphics on a fax machine, it is used as fax paper; It can be used as a recording material in medical and measurement systems, such as ECG drawings, thermal instrument recording paper, etc.; Printing paper for Internet terminals; In terms of commercial activities, it is used to make trademarks, signatures (POS), etc., and the amount of fax paper accounts for the largest proportion.

Reasons for using thermal paper:

Because thermal paper is easy to carry and quick to print.

A layer of "thermal paint" (thermal chromic layer) is applied to high-quality base paper.

Although there are more than a dozen chemicals used in this discoloration layer, at least the following compounds are available: colorless dyes, which are widely used, the most commonly used are fluorescent compounds; The chromogenic agent accounts for less than 20%, and the commonly used ones are bisphenol and para-hydroxybenzoic acid; Sensitizers account for less than 10%, which contain benzenesulfonic acid amide compounds; The filler accounts for less than 50%, and calcium carbonate (particles) is commonly used; Adhesives account for less than 10%, such as polyvinyl acetate; stabilizers, such as diphenyl p-phthalate; lubricants, etc. Thermal paper changes color when heated.

Principle: When the thermal paper is placed in an environment above 70 degrees, the thermal coating begins to change color. The reason for its discoloration also starts with its composition.

There are two main types of heat-sensitive components in thermal paper coatings: one is colorless dye or hidden dye; The other is a chromogenic agent. This type of thermal paper is also known as two-component chemical thermal recording paper.

Commonly used as colorless dyes are: crystal violet lactone (CVL), fluorane system, colorless benzoylmethylene blue (BLMB) or spiropyran system and other substances in the triphenylphthalide system.

The commonly used dispersants are: polyvinyl alcohol L-3266, polyvinyl alcohol GL-05, polyvinyl alcohol KL-03 (made by Japan Synthetic Chemical).

The commonly used top and bottom coating additives are: Gohsefimer Z-200, polyvinyl alcohol T-350, polyvinyl alcohol N-300.

Commonly used as a chromogenic agent is mainly parahydroxybenzoic acid and its esters (PHBB, PHB), salicylic acid, 2,4-dihydroxybenzoic acid or aromatic sulfone.

After the thermal paper is heated, the colorless dye reacts with the chromogenic agent to produce color, so when the thermal paper is used to receive the signal on the fax machine and print or directly print with the thermal paper printer, ** is displayed. Since there are many varieties used as colorless dyes, the color of the handwriting displayed is different, such as blue, fuchsia, black, etc.

Thermal paper is widely used in shopping malls, supermarkets, logistics and transportation, medical and health and other industries, we use our fingers to gently scratch on the thermal paper, we will find that there are traces of color, which may be black or blue, so how does the thermal paper develop color? The following Farui Paper will popularize the color rendering principle of thermal paper for you.

1. Melt transparent thermal paper.

The principle of color development of molten transparent thermal paper is to coat a layer of opaque wax as the surface layer on the black base paper, and the opaque waxy material is melted and transparent through the action of a hot pen, and the color of the bottom layer of the base paper is revealed to form an image.

2. Metallic compound color-generating thermal paper.

The principle of color development of metal compound chromogenic paper is based on the co-mixing of heavy metal salts and reducing agents of fatty acids, and the use of heating and heating to melt the fatty acid salts and react with the reducing agent, so that the heavy metals are reduced and free to develop color.

3. Colorless dye type thermal paper.

The color development principle of colorless dye-type thermal paper is based on the mixing of a colorless dye containing an inner lipid ring with a chromogenic agent, and under the action of heat, the chromogenic agent reacts with the colorless dye by hot melting and develops color.

Thermal printing paper is a different kind of coated paper, and its appearance is similar to that of ordinary white paper. The surface layer of thermal printing paper is very smooth. It is made of ordinary paper as a paper base.

Top with a hot coat of hair color. The hair color layer consists of an adhesive, a hair color blob, and no tint (or no tint) and is extracted without microcapsules. Chemical changes are in an "ambush" situation.

When the thermal paper encounters the heated printer printhead, the hair colorant and the tint dye on the print head cause a chemical reaction, changing the color, resulting in images and markers.

Thermal paper is thermal printing paper, thermal fax paper, used in thermal printers and thermal fax machines, its quality directly affects the printing quality and storage time, and even affects the service life of printers and fax machines.

The characteristics are as follows: the handwriting generated by fax or printing on the thermal paper is unstable and will fade naturally, the reason is that the color development reaction of the thermal paper is reversible, the colored products will decompose themselves to varying degrees, and the color of the handwriting will slowly fade more and more light, until the natural fading to the point that the handwriting completely disappears in the white paper. Therefore, under the action of external conditions such as high ambient temperature, humidity and contact with adhesive tape, it will also accelerate the decomposition of color products and accelerate the fading of color. Of course, the speed of fading is also related to the thermal material of the thermal paper itself.