Due to the characteristics of various varieties, bright colors and good tinting strength, organic pigments are widely used in industrial fields such as ink printing, coatings, plastics and rubber, and become indispensable coloring materials for the production of various industrial products. However, with the increasing awareness of environmental protection, people's requirements for the safety and environmental protection of dyeing and pigment products are also increasing. The United States, Europe, Japan and other countries have established institutions to study the ecological safety and toxicology of dyes and pigments, specializing in understanding and researching the impact of dyes and pigments on human health and the environment. The relevant labor safety and health management departments in my country are also very concerned about this issue. Pay attention to
High-performance organic pigments show more excellent physical and chemical properties when used. They not only have the advantages of bright colors and high color strength of classic organic pigments, but also meet the requirements of light resistance, heat resistance, and Solvent and other higher performance requirements have become the development trend of organic pigments.
High-performance organic pigments have high research and development costs and technical content, complex processes, and long marketing cycles, but they have higher added value. Therefore, people began to turn to high-performance organic pigment substitutes with excellent performance. It is an inevitable trend in the development of the industry to develop new varieties of green and environmentally friendly dyes and pigments to replace harmful varieties.
Conventional production post-treatment process of solvent-based high-performance organic pigments
Add metered water and hydrochloric acid into the beating kettle.
The temperature of the material put into drying under stirring was raised to 60° C. for 2 hours, and the yield was 94.9%. After the holding time is up, put the material into the suction filter tank and wash it with hot water to neutrality (washing waste water is removed for sewage treatment), then drain it, send it to the oven for drying, crush, pack, and put it into storage. The water vapor generated during the drying process is directly discharged into the atmosphere, and the dust generated after crushing is treated by a bag filter and discharged into the atmosphere. The recovered dust is mixed into the finished product, with a total yield of 66.8%.
Each unit operation in the conventional production post-processing process production equipment has corresponding unit equipment. Most of these equipment have single functions, high labor intensity, and more material loss during operation; what is more noteworthy is that these equipment are generally open. operation, it is easy to cause pollution to the environment and endanger the health of operators. There are also some problems in the use of drying equipment. The more prominent ones are that the solvent cannot be completely recovered and the dust collection device is lacking. Some manufacturers even use the open-air drying method for drying, which is not economical, environmentally friendly, and affects product quality. Needs improvement.
Process flow of solvent-based high-performance organic pigment environmental protection production patented new equipment cylinder cone filter washing and drying machine
The fully enclosed production process of solvent-based high-performance organic pigments includes: (1) preparing a diazonium salt solution; (2) adding the diazonium salt solution to the suspension for coupling reaction; (3) adding rosin soap to the product of the coupling reaction and emulsifier fatty alcohol polyoxyethylene ether, use fully enclosed three-in-one to filter, wash, and dry to obtain crude pigment dry powder; (4) add polar solvent to the filter washing and drying machine equipped with crude dry powder, Under the condition of 0-50°C, carry out pigmentation treatment, filter, wash and dry to obtain the finished pigment.
The coloring power of the pigment prepared by the method is obviously improved, and the comprehensive application performance of the pigment is improved.
The solvent-based high-performance organic pigment fully-sealed post-treatment process has the following characteristics:
(1) Pigmentation is carried out under low temperature conditions, reflux device is omitted, the solvent smell is small in the production process, and the solvent evaporation loss is relatively small;
(2) The concentration of solvent in the pigmented mother liquor is high, which is beneficial to solvent recovery, saves the cost of solvent distillation recovery, and the amount of solvent loss is small;
(3) The obtained pigment has high tinting strength, and the tinting strength on the water-based paint is more than 10% higher than that of the external standard, which can meet the needs of applications with higher color power requirements. In addition, under the same tinting power, the surface treatment amount of the pigment is correspondingly increased. Reduced raw material costs.
(4) The fully-sealed post-treatment process further improves the tinting strength on the basis of satisfying the various application properties of the pigment, reduces the production cost, and increases the economic benefits.
Solvent-based high-performance organic pigments environmentally friendly production patented new equipment cylinder cone filter washing and drying machine technical advantages
According to the process requirements of clean production and intrinsic safety of dyes and dye intermediates for advanced liquid-solid separation and drying systems, it has the following advantages:
(1) Safety and environmental protection
The fully enclosed reaction crystallization filtration drying multifunctional equipment can be designed as a fully enclosed operating system, which can completely avoid the pollution of the operating environment air by solvents during the production process, and at the same time reduce the occurrence of poisoning accidents caused by contact with toxic substances. This advantage is even more crucial in today's increasingly loud voices for environmental protection and labor protection.
(2) Complete recovery
Materials and solvents are almost completely recovered, avoiding waste and pollution caused by material leakage and solvent volatilization, which has great economic benefits, especially when dealing with high-value materials and solvents.
(3) Save manpower
A non-technical person who has undergone simple training can complete the operation. Opening, closing, automatic feeding and automatic discharging do not require technical personnel to monitor.
(4) Clean thoroughly
The multifunctional filter drying equipment has the function of resuspension, and the filter cake can be washed very thoroughly.
(5) drying at the same time
Filtration, washing and drying can be done in one system.
(6) Continuous operation
Filtration and drying can be performed in a continuous system. The wet filter cake that does not need to be treated can be unloaded directly; if further drying is required, the wet filter cake is directly discharged from the filter into the dryer, and can be mechanically transported to the weighing and packaging sections after drying.
The research and development of the patented new equipment, the cylinder-cone filter, washing and drying machine, meets the environmental protection production requirements of solvent-based high-performance organic pigments, and is an inevitable trend to eliminate technological barriers and promote the optimization and upgrading of the industrial structure of the high-performance colorant industry. ZhangHua mechanical filtering, washing and drying all-in-one machine will definitely promote the development of the domestic dye and pigment industry and meet the needs of industrial development for the improvement of the grade and performance of dye and pigment products, environmental protection and scale expansion.