Printing And Dyeing Colleagues Work Together To Make Energy Saving And Emission Reduction More Effective.

"Printing and dyeing colleagues work together to make energy saving and emission reduction more effective."

Under such a common premise, the new technologies of dyeing and finishing at the four new conference have been well communicated and promoted by the participants. The participants are eager to learn about the R & D and promotion of some key technologies and the direct benefits for energy saving and emission reduction. The operability of these new dyeing and finishing technologies has attracted much attention.

Moderator: I would like to invite experts to talk about the new technology, new technology and new products brought by this conference. What is the background of the research and development of these projects? What are the impacts on the related fields?

Wang Xingnan: Shanghai Yuhui Chemical Co., Ltd. brought the "spray foam dyeing process". After comparing the injection of low foam liquid with that of rolling mill, Yu Hui chemical concluded that the spray method made the fiber gap free from moisture and reduced the energy required for drying or steaming. The spray method makes the fabric free of water very little and does not hydrolyze in the free water before fixing. dyestuff Produce. The spray way makes the direct injection way, no stripper phenomenon, no salt to promote dyeing. Spray The way of fabric dyeing or chemical fluid does not take into account the occurrence of swimming. Due to the lack of rolling point pressure, the foam style is full and the hairiness is not affected. At the same time, the fabric can quickly reach the fixation temperature at the fixation stage, and the color is sufficient. After fixation with reactive dyes, washing is very easy because of the dry salt free fabric and few floating colors.

Mao Weimin: "the key technology development of low temperature dyeing and finishing" is the key research project of Zhejiang Limited by Share Ltd. Therefore, the key to the sustainable development of the printing and dyeing industry is to study the environmentally friendly processing technology of cotton fabrics. While ensuring the processing effect, it is particularly important to choose low energy consumption and low pollution processing technology.

Wang Xiaojun: Jiangsu de Mei Ke Chemical Co., Ltd. has brought about the influence of reactive dyes on the cost of finishing. This study is aimed at enhancing the color fastness of dyes by adding auxiliaries to dyes. The W type reactive dyes produced by the research and Manufacture Co., Ltd. are all double reactive reactive dyes, which effectively enhance the reaction capacity with the fibers. At the same time, we are Dye manufacturing The addition of special auxiliaries increased the reaction ability between dyes and fiber molecules during dyeing, enhanced the fixation ability of dyes, reduced the production of hydrolyzed dyes, and improved the color fastness of dyed products.

Through the influence of additives on dyeing, fixing and coloring, the conclusion is as follows: first, the color of a washed water is very shallow. Additive B< conventional additive A< additive C. The two is the color of soaping water: the conventional additive A< additive C< additive B. The results are as follows: the lighter the color is, the better the fixation rate. The darker the soaping color, the better the cleaning effect.

Host: what are the characteristics and advantages of these technologies compared to traditional processes and products?

Wang Xingnan: the traditional rolling, drying, rolling and steaming (activity) advantages are the most economical for mass production. The product produced in this way has good surface effect, high color yield, and has no great influence on light and chlorine bleaching fastness, but also has good reproducibility. But the drawback is that the salt content is high, and the salt content in the sewage is also high, which is not suitable for the fabric that may cause high swimming. The drying process takes a relatively long time, and the relative investment is relatively large. The chemical bath is not easy to balance, and needs water sealing to enter the cloth.

The process of rolling and drying is similar to that of traditional process. The concentration of the alkali agent is converted from the traditional leaching chemical fluid, without losing the fixation and alkaline conditions. After applying the fixing liquid, baking to 140 degrees ~150, it can quickly maintain the temperature of 55 degrees ~70 degrees inside the fabric, and the humidity of the fiber expansion inside the oven is carried by the fabric itself without steam supply.

Mao Weimin: the characteristics of low temperature scouring and bleaching process are the increasing attention paid to ecological environment at home and abroad. New technologies such as energy saving, consumption reduction, environmental protection and short process are the inevitable trend of the development of pretreatment process. The production practice has proved that compared with the traditional process, the low temperature scouring and bleaching process is more flexible, and can be combined freely according to the factors such as equipment and processing varieties.

Low temperature scouring and bleaching process ensures high whiteness while the fabric strength is basically free from damage, which greatly reduces the oxygen bleaching hole. After treatment, the fabric feels soft and plump, showing natural luster. The low temperature scouring and bleaching process can save energy and reduce emissions and reduce the comprehensive cost. The comprehensive cost of the process is reduced by 12% compared with the conventional process, and the steam cost is reduced by 56%. {page_break}

Wang Xiaojun: dye dyeing synergistic additives can improve the color fastness and reduce the amount of finishing agent. The use of demicco reactive dyes can reduce the cost of finishing process without or using less fixative. According to the saving of 10 kilograms per 10000 meters, the cost of fixing color can be reduced by about 500 yuan. W dyes are suitable for all dark color and high fastness requirements.

The acid washing soaping keeps the pH value of the fabric slightly acidic, and the de MECO reactive dyes are especially suitable for the cotton printed and dyed fabrics with added value finishing function. PH value is neutral or slightly acidic, which lays a solid foundation for finishing various additional functions. It can fully meet the requirements of fluorine water proofing, antifouling and easy decontamination, and it is slightly acidic to cloth surface, so as to give full play to the application of additional functions after finishing.

Reactive dye additives improve dark touch. When reactive dyes are dyed black, they feel stiff after dyeing, and dye concentration is increased to achieve the depth of dyeing. A large number of dyes dyed on the surface are not only low in color fastness, but also difficult to handle. The application of reactive dye additives increased the dye into the fiber and formed a covalent bond with the fiber. The cloth looked so deep that it could reduce the dye dosage, improve the hardness and astringency of some dark blue and black dyed fabrics, reduce the amount of softening agent in the finishing process, and reduce the cost by 100 yuan per litre according to the reduction of 10 kilograms per litre.

Host: what are the intuitive benefits of these technologies and processes for energy saving and emission reduction? What are the irreplaceable technologies?

Wang Xingnan: our analysis of the wet short steamed E-CONTROL process (Fuji and Texas intellectual property) concluded that its advantages are less chemical additives and no need for salt. It is suitable for dyeing cotton and cotton blended fabrics with other difficult technologies. It has high color yield, good surface effect, no chemical impregnated rolling, no urea, no influence on fastness. Its disadvantage is that the reactive dyes are highly localized. To use the dyestuff dye, the laboratory is not easy to simulate the wet short steaming process, and the equipment is expensive and the technological conditions are difficult to control.

Yu Hui's patent spray technology has highlighted its advantages. There is no need to use salt, because no dye balance is added, no dye chemical bath is dropped, chemical liquid is applied to low feed liquid, the drying time is shortened, and the efficiency of oven replacing steaming is higher.

Because the amount of liquid brought into the oven is reduced, the energy consumption of the wet drying box is very small. The use of salt free water without hydrolyzed dyes in free water can reduce the pressure of washing process. There is no waste liquid in the batch of chemical liquid, and the filtered mercerized light alkali can also be used.

Mao Weimin: during the development of new technology, we encountered some problems: short process technology should be formulated according to specific conditions, the application scope of enzyme preparation is limited, new auxiliaries need to be developed synchronously with technology, and the new technology still stays in the laboratory stage.

The key technology of low temperature dyeing and finishing is good in energy saving and emission reduction while reducing the comprehensive cost. The comprehensive cost of the process is reduced by 12% compared with the conventional process, and the steam cost is reduced by 56%.

Among them, the low alkali dyeing process, the reactive dye LA series: Micro alkali fixation, the dosage of soda ash is only the traditional dosage of 1/8-1/20. Using this process, dyeing rate is low, color is not easy to dye, and dyes are less hydrolyzed, which can improve the fastness. At the same time, it can quickly stain, save time and safety. Simple operation, low cost, good washability and less waste water discharge. Excellent compatibility and dyeing stability ensured the reproducibility and success rate of dyeing.

Wang Xiaojun: the cold pad batch special dyes selected from the W type are excellent in chromatography and high in adaptability. They are used in printing and dyeing factories and reflect good performance. The cold pad batch dyeing process, which can be applied to environmental protection and energy saving, has excellent low temperature dyeing performance, high fixation rate, excellent color and light stability. The direct compatibility of the varieties is basically the same. The strong alkali resistance and medium compatibility of the dyes can achieve the high reproducibility of cold pad batch. It can meet the dyeing of medium and heavy fabric, save energy and achieve the goal of reducing consumption.

Anti dyestuff dyes can improve the printing quality. With the continuous adjustment of market printing products, the change of flower pattern and fashion style, the printing and printing products of reactive dyes are deeply concerned by consumers. Our company develops and develops a set of W type of pullable and preventable environment-friendly reactive dyes. It is the first choice for printing, printing and carving. As the printing effect of high-grade fabrics, direct printing can not be replaced.

The high performance salt free P dye has obvious effect of saving energy and reducing consumption. High performance double activated P type dyes are applied to white products with white bottom orders. Its excellent properties are derived from the use of organic dye additives instead of inorganic salt filler in de MECO dye, which can effectively achieve high solid color and low stain on white bottom. Recommended orange P-GN, red P-4B, blue P-5R salt free dyes. With the reduction of inorganic salts in water, the waste water can be degraded by the current sewage treatment process, which meets the requirements of low carbon and environmental protection.