In recent years, the international community has been very concerned about the deterioration of environmental quality and the imbalance of ecological balance. Humanity is facing the most serious environmental crisis in history. Most of the environmental pollution is directly related to industry and industrial products. related to pollution. Aromatic amines, which are dye intermediates, have been listed as suspected carcinogens by government agencies in some countries. Among them, benzidine and β-naphthylamine have been confirmed to be the most potent carcinogens to humans. To this end, countries around the world are paying attention to dye production and emphasizing environmental protection has become a top priority. The United States, Europe, and Japan have established institutions to study the ecological safety and toxicology of dyes, specializing in understanding and studying the impact of dyes on human health and the environment, and formulating The content index of heavy metals in dyes.
About 70% of the synthetic dyes currently on the market are based on azo structures and are widely used direct dyes, acid dyes, reactive dyes, metal complex dyes, disperse dyes, cationic dyes and condensation dyes, etc. , all contain azo structures. In addition, in accordance with the requirements of ecological textiles and the ban on 118 kinds of dyes, environmentally friendly dyes should include the following ten aspects: (1) Do not contain those expressly stipulated by the German government, the European Organization and Eco-Tex Standard 100 under specific conditions. Azo dyes that will break down to release 22 carcinogenic aromatic amines; (2) are not allergic dyes; (3) are not carcinogenic dyes; (4) are not acutely toxic dyes; (5) the content of extractable heavy metals is within the limit value below; (6) does not contain environmental hormones; (7) does not contain chemicals that can cause environmental pollution; (8) does not contain mutating compounds and persistent organic pollutants; (9) formaldehyde content is below the specified limit; (10) Varieties that do not contain restricted pesticides and the total amount is below the prescribed limit.
FOSC series of environmentally friendly high-fastness acid dyes are new structural dyes developed by Beijing Hengpu Technology Co., Ltd. in cooperation with world-renowned scientific research institutions India Chemical Technology Laboratory and Federal Institute of Chemical Technology. This series of dyes are environmentally friendly dyes that fully comply with the above requirements for ecological textiles. At the same time, the excellent performance of FOSC series dye products is at the absolute leading level among all such products at home and abroad. Its dye fastness is even better than similar products sold on the market, which satisfies domestic fur processing enterprises. processing requirements.
At present, a large part of my country's dye production enterprises still adopt the production processes used early in foreign countries. These processes have obviously fallen behind. The drying of dyes is basically oven drying, and there has been no change in decades. Compared with large foreign companies, dyes generally have high impurity content, dull color, low solubility, and unstable color, intensity and other indicators of products between batches. These problems seriously restrict the development of my country's dye industry. The production of FOSC series dyes adopts the most advanced foreign production technology, which effectively controls the side reactions that affect the color and light stability of the dye during the dye synthesis process, improves the purity of the main product, and thus ensures the stability of the dye color and light. . In terms of dye strength, in order to ensure the stability between batches, each batch of newly synthesized and tested dyes is put into the blending equipment of reserved dyes according to reserved dye: new dye = 1:4 reserved materials , mix it, and then take out 20 from it. This method can effectively reduce the difference in color light and intensity between product batches and maintain the stability of the color light intensity. In addition, the spray drying process is used in the dye post-processing and drying process. Since this process can dry the material instantly, it overcomes the changes caused by heat sensitivity of some materials, which is of great help to the stability of the color and light of the dye. Moreover, dyes processed by spray drying have a significantly higher dissolution speed than dyes processed by traditional drying processes, which also lays the foundation for the production of high-quality dyes.
FOSC series dyes have the following characteristics:
1. They are versatile and can be applied to most protein fibers.
2. FOSC series dyes are environmentally friendly dyes and do not contain 22 kinds of aromatic amines that can cause cancer.
3. The color is bright, natural, full and complete in color spectrum.
4. Fast coloring, high cleaning rate, and very light coloring of the leather panel.
5. The dyeing temperature is low, good dyeing effect can be achieved at 60℃, and the fur tanned with KASTANO DC, the white tanning agent of KASTANO DC, will have better effect when used together.
6. It has good binding force, level dyeing and compatibility.
7. All series of dyes have excellent fastness to sunlight, water washing, friction, ironing and perspiration. Among them, the fastness to sunlight
and water washing are both excellent. It can reach level 4-5, and even some products can reach level 5.
The reason why FOSC series dyes have such excellent color fastness lies first in the composition and molecular structure of the dyes. At the beginning of dye development, R&D engineers screen the structure of a single dye with good color fastness, such as light fastness. Among the three primary colors, yellow dyes with high light fastness are mostly pyrazolones and pyridones. It is a coupling component or a monoazo dye with 2-naphthylamine-3,6,8-trisulfonic acid as the diazo component. Since they have introduced electron-withdrawing groups adjacent to the azo group, the azo group is The electron cloud density of nitrogen atoms is reduced, which is not conducive to the generation of oxidized azo compounds, thereby preventing or reducing the occurrence of photooxidation reactions. Therefore, these dyes have better sunlight fastness; dyes with high sunlight fastness in blue chromatography are mostly anthracene. Quinone type, phthalocyanine type, and carboxyl type are the parent structures; the light fastness of red chromatographic reactive dyes is generally low, especially light colors, and only some adjacent positions of azo groups contain hydroxyl groups with coordination ability, which are compatible with copper After forming a stable chelate ring, the light fastness can be improved. Then the same analysis is done on the dye structures of other dyes with various color fastnesses, and finally the dye structures with good color fastness are determined, and the synthesis routes are designed, so as to synthesize dyes with new structures and optimal color fastness.
Secondly, another important aspect that affects dye fastness is the control of the dyeing process. Dyeing includes adsorption, penetration, binding and other processes, so it is necessary to ensure sufficient processing time. Otherwise, it will inevitably affect the binding fastness of the dye and wool fiber, thus affecting the various fastnesses of the product. Generally, depending on the color depth or dye type, the dyeing time should be no less than 90 minutes. Properly extending the dyeing time is very beneficial to improving the various fastnesses of the finished products. On the other hand, wool fibers also need to be fully expanded under higher temperature conditions to expand the fiber gaps and facilitate the penetration and migration of dye molecules into the interior. For the same dye variety, if other process conditions remain unchanged, appropriately increasing the dyeing temperature can significantly improve the fastness of the finished product. It is also very important to control the pH value of dyeing. The isoelectric point of hair coat keratin is about 5.6. In the early stage of dyeing, control the pH to be above the isoelectric point of the coat. The coat will be uncharged or slightly negatively charged. At this time, it can hinder the dyeing process. Anionic dyes combine with wool fibers to facilitate dye penetration and leveling. In the later stage of dyeing, lowering the pH of the bath solution facilitates the combination and fixation of dye molecules and wool fibers, which can improve the light fastness of the finished product. Therefore, the timing and gradient of lowering the pH must be grasped well, which can not only ensure uniform dyeing, but also increase the dye absorption rate, improve the bonding fastness and the color fastness of the finished product.
In line with the purpose of promoting the "green, environmentally friendly and healthy" fur industry, Beijing Hengpu Technology Co., Ltd. independently develops a series of green and environmentally friendly water field products. The products are: KASTANO DC, a white tanning agent , Case? Tanbao BL, Case? Aldehyde remover DR, Case? Hair conditioner E6, Case? Defoaming agent HB, Case? Bleaching powder BLANKIT.
KASTANO DC, a white tanning agent, was jointly developed by Beijing Hengpu Technology Co., Ltd. and well-known foreign companies, and was officially launched in 2013. Since this product does not contain any form of aldehyde or chromium at the beginning of its development, and is supplemented by advanced and reasonable operating techniques, it solves the problems of hexavalent chromium and formaldehyde caused by the traditional chromium tanning process in the tanning process. The tanning agent has strong permeability, good filling properties, and strong ability to bind to collagen. It is suitable for fur production when making white leather panels and has good tanning properties.
The color of the leather board is white, soft and plump, and it can give the leather board excellent dyeing properties.
Case Tanbao BL is a material that is easily soluble in water, which can make the tanning agent penetrate better into the skin, make the tanning agent evenly combined in the skin, and improve its fullness and flexibility. properties and shrinkage temperature. Used in conjunction with KASTANO DC, a white tanning agent, it can improve the ability of leather panels to withstand repeated wetting, drying and cycling. It is also beneficial to later bleaching and reduces skin coloration. In addition, it can also increase the service life of finished products.
Case? Formaldehyde remover DR is a material that is easily soluble in water and has extremely high reactivity with formaldehyde. It can completely react with formaldehyde quickly at room temperature to generate harmless substances, thereby greatly reducing the free formaldehyde content in fur or leather. Case Formaldehyde Remover DR reacts irreversibly with formaldehyde. It can react with formaldehyde released from fur or leather at any time to protect the safety of fur or leather. Use it several times and adjust its dosage to reduce formaldehyde in fur or leather to very low levels.
Case Hair Protector E6 is compounded of special biochemical raw materials and selected additives, and has good protection for coats and skins. In the bleaching bath, the coat and skin can be protected to the greatest extent from damage by oxidants and reducing agents, and the original luster, feel and elasticity of the coat can be maintained to the greatest extent.
Case? Defoaming agent HB can quickly defoam and inhibit the generation of foam, without affecting the feel of the leather board, and can reduce the tangle of the coat and improve the gloss and feel of the coat.
Case? Bleaching Powder BLANKIT is a fur-specific bleaching product jointly developed with Australia Lagrange Luo Chemical Co. Ltd. and officially launched in 2012. The bleaching performance of this product far exceeds other products on the market. Similar products do not contain optical brighteners. The bleaching efficiency is extremely strong, the whiteness is high and stable, and the fiber will not be damaged. Able to bind iron ions and heavy metal ions, wool can maintain a soft feel even in poor water conditions. Bleaching is achieved by reducing the colored components on the fibers, causing them to fade and dissolve in water.
At present, the most common technical trade measures encountered when exporting products in China’s fur industry are requirements for special chemical indicators in fur. Among them, the most demanding ones are hexavalent chromium, azo dyes, formaldehyde and pentachlorophenol. etc., especially for furs exported to the EU. With the development of China's fur industry, the processing technology and the synthesis technology of fur chemicals have continued to improve, and the ecological and environmental awareness of the Chinese fur industry has also been greatly improved. Against this background, the Chinese fur industry has made great progress in azo dyes, formaldehyde, and five chemicals. An effective solution has basically been found for chlorophenol (PCP). In addition, Beijing Hengpu Technology Co., Ltd. has conducted in-depth research in related fields on how to solve the common problems of domestic dyes such as high impurity content, dull color, low solubility, and unstable color, intensity and other indicators of products between batches. The exploration has made great efforts to effectively improve the quality of domestic dyes, and the successful development of FOSC series dyes also represents a new level of high-quality dyes in China. At the same time, Beijing Hengpu Technology Co., Ltd., a high-tech enterprise, has been working intensively in the field of fur chemicals, striving to develop green products such as Case White Tanning Agent KASTANO DC, Case Formaldehyde Remover DR, Case Hair Conditioner E6, etc. Environmentally friendly products, I believe that as these green and environmentally friendly products continue to be widely used in the market, they will surely promote the development of China's fur industry in the direction of "green, environmentally friendly and healthy".