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Laboratory research on thiourea and leather industry

Views: 0     Author: Site Editor     Publish Time: 2024-04-03      Origin: Site


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The Importance of Scientific Research

In the field of scientific research, thiourea is widely used as an intermediate in the synthesis of various compounds due to its structural characteristics and reactivity. Thiourea can participate in various chemical reactions, such as nucleophilic substitution, amidation, condensation, etc., to synthesize compounds with specific biological activities. In addition, thiourea and its derivatives have extensive applications in organic synthesis, materials science, pharmaceutical chemistry, and other fields, especially in the development of new drugs and the improvement of existing drugs, which have important value.


The Importance in Industry

The application of thiourea is equally important in industrial production. It is mainly used as a vulcanization promoter in the rubber industry, which can accelerate the chemical reaction between rubber and vulcanizing agents, improve vulcanization efficiency, and thus improve the physical properties of rubber products. Thiourea is also used in agriculture as a nitrogen fertilizer and fungicide, which helps to improve crop yield and quality. In addition, thiourea also has important applications in electronic electroplating fields such as electroplating solutions and printed circuit boards in the electronics industry.


Chemical properties of thiourea


physical property


Appearance: Thiourea typically appears as a white to light yellow crystalline solid with a glossy appearance.


Melting point: The melting point of thiourea is approximately 182 ° C.


Boiling point: Decomposes at 263 ° C without a clear boiling point.


Relative density: The relative density of thiourea (water=1) is approximately 1.41.


Solubility: Thiourea has a lower solubility in water, but can dissolve in hot water; Easily soluble in ethanol, slightly soluble in ether.


Critical pressure: The critical pressure of thiourea is 8.23 MPa.


The octanol/water partition coefficient is between -1.08 and -1.02, indicating that thiourea is more hydrophilic.


Flash point: Thiourea has a flash point higher than 182 ° C, indicating that it is not flammable.

chemical property


Chemical reactivity: Thiourea can react with various chemical substances, such as hydrogen sulfide, calcium cyanamide, etc., to form thiourea.


Acidity: Thiourea is a weakly acidic compound that can react with bases to form salts.


Thermal stability: Thiourea is stable when heated, but may decompose at high temperatures.

Reductivity: Thiourea has reducibility and can reduce free iodine to iodide ions.


Tautomerism: Thiourea has tautomerism properties, which means it can undergo proton transfer between its amino and sulfur atoms.


Decomposition products: Thiourea produces sulfides and nitrogen oxides during thermal decomposition, which are harmful to the environment.


security information


Operation precautions: When operating thiourea, appropriate safety measures should be taken, such as closed operation, local ventilation, wearing protective clothing and gloves, etc.


First aid measures: After skin contact with thiourea, rinse thoroughly with soap water and water immediately; After eye contact, rinse with flowing water or physiological saline and seek medical attention; After inhaling thiourea, one should quickly leave the scene to a place with fresh air and keep the respiratory tract unobstructed; After ingesting thiourea, one should drink sufficient warm water, induce vomiting, and seek medical attention.


Fire fighting measures: harmful nitrogen oxide and sulfur oxide gas may be produced when thiourea burns. Water, foam, carbon dioxide, sand and other methods shall be used to extinguish the fire.


Application of Thiourea in Metal Treatment


Metal corrosion inhibitor

Thiourea and its derivatives, as effective corrosion inhibitors, have a wide range of applications in metal anti-corrosion treatment. They can form a chemical adsorption layer with the active sites on the metal surface, thereby preventing direct contact between the corrosive medium and the metal, slowing down or preventing the corrosion process of the metal.


Mechanism of action: The sulfur atoms in the thiourea molecule have a significant coordination effect, which can form stable chemical bonds with metal ions, form an adsorption layer, and prevent the erosion of corrosive media.


Application areas: Thiourea and its derivatives are used for corrosion inhibition of various metals such as steel, copper, aluminum, etc., especially in corrosive environments such as chemical and marine engineering.


The important role in the coating process


In the electroplating process of metals, thiourea and its derivatives can serve as additives to improve the quality and performance of coatings.


Improving coating performance: Thiourea can improve the glossiness and uniformity of the coating, enhance the adhesion and corrosion resistance of the coating.


Environmental advantages: Compared with traditional processes such as chrome plating, the electroplating process using thiourea as an additive is more environmentally friendly, reducing the use and emission of harmful heavy metals.


Metal surface treatment and polishing


Thiourea also plays an important role in metal surface treatment and polishing processes.


Polishing process: Thiourea can be used as a polishing agent to remove small scratches and defects on the metal surface through physical or chemical reactions, improving the glossiness of the metal surface.


Surface modification: Thiourea can also be used for chemical modification of metal surfaces, improving the wear and corrosion resistance of metals by forming a protective film.


Application of Thiourea in Leather Industry


The role of leather tanning process


Thiourea can serve as an effective tanning agent in the tanning process of leather. Tanning is a crucial step in leather processing, which transforms the original animal skin into usable leather, endowing it with durability and softness. The role of thiourea in the tanning process includes:


Softening effect: Thiourea can help soften leather, making it more flexible and easy to process.


Stability: Thiourea helps stabilize the protein structure of leather, improving its durability and tear resistance.


Antibacterial effect: Thiourea has certain antibacterial properties, which can inhibit the growth of microorganisms and extend the service life of leather products.


Improve leather quality and appearance


The application of thiourea can not only improve the physical properties of leather, but also enhance the appearance quality of leather:


Uniform color: Thiourea helps to evenly distribute the color of leather, making the leather color more natural and consistent.


Touch improvement: The leather treated with thiourea has a more delicate touch, enhancing the leather's touch and comfort.


Appearance beautification: Thiourea can improve the glossiness of leather, making its appearance more beautiful.


Environmental issues and solutions


The leather industry generates a large amount of wastewater and waste during the production process, which have a serious impact on the environment. The application and solutions of thiourea in environmental protection include:


Reduce the use of chromium salts: Traditional tanning processes often use chromium salts, which are harmful to the environment and human health. Thiourea, as an environmentally friendly tanning material, can reduce the use of chromium salts and reduce its impact on the environment.


Wastewater treatment: The use of thiourea in the tanning process can reduce the content of harmful substances in wastewater, simplify and improve the wastewater treatment process.

Green manufacturing: The application of thiourea conforms to the concept of green manufacturing and helps the leather industry achieve sustainable development.


Other industrial uses of thiourea


Promoters in the rubber industry


In the rubber industry, thiourea is mainly used as a vulcanization promoter. It can accelerate the chemical reaction between rubber and vulcanizing agent, thereby shortening vulcanization time and improving production efficiency. The use of thiourea can significantly improve the elasticity, wear resistance and anti-aging properties of rubber, making it more suitable for the production of various industrial and consumer goods. In addition, thiourea can also improve the processing performance of rubber, making it easier to shape and process.


Intermediates in the pharmaceutical industry


Thiourea, as an intermediate in drug synthesis in the pharmaceutical field, plays a crucial role in the synthesis of various drugs. Due to the presence of active sulfur atoms and amino groups in thiourea molecules, they can participate in various chemical reactions such as nucleophilic substitution, acylation, condensation, etc., thus synthesizing compounds with specific biological activities. Thiourea has a wide range of applications in the synthesis of anti-thyroid drugs, antifungal drugs, anti-tumor drugs, and so on.


Growth regulators in the agricultural sector


Thiourea, as a plant growth regulator in the agricultural field, has a regulatory effect on plant growth and development. It can affect the entire process of plant life, including cell growth, division, rooting, germination, flowering, fruiting, maturation, and shedding. By using thiourea reasonably, the growth process of crops can be effectively regulated, achieving stable and increased yield, improving quality, and enhancing crop stress resistance. The use of thiourea needs to strictly follow the dosage, period, and method on the label to avoid adverse effects on crop quality and human health.


The environmental impact of thiourea


The environmental impact of thiourea

Thiourea may have a certain impact on the environment during production and use. The production of thiourea may generate wastewater and exhaust gas, which, if not properly treated, may cause pollution to water bodies and the atmosphere. In addition, the decomposition products of thiourea may include sulfides and nitrogen oxides, which are harmful to the environment and may lead to soil and water acidification, ecosystem damage, and potential threats to human health.


Discussing the environmental friendliness of thiourea


Although thiourea poses potential environmental risks, its impact on the environment can be reduced by taking appropriate measures. For example, improving production processes, using environmentally friendly raw materials, implementing strict emission standards and treatment measures can all help reduce the negative impact of thiourea production on the environment. In addition, thiourea has lower environmental risks compared to other chemicals in certain applications, so its overall application effectiveness and environmental benefits need to be considered when evaluating its environmental friendliness.


Exploration of Green Synthesis Methods


In order to reduce the environmental impact of thiourea production, researchers have been exploring more green synthesis methods. These methods aim to improve the utilization of raw materials, reduce the generation of harmful by-products, and reduce energy consumption and carbon emissions. For example, the "one pot method" for synthesizing ethylenethiourea (ETU) can be carried out in an aqueous medium, avoiding the use of organic solvents and achieving high yield and purity of the target product synthesis.


Market prospects of thiourea


Market demand and development trends


Agriculture: Thiourea, as a nitrogen fertilizer, provides essential nitrogen elements for crops and promotes crop growth. At the same time, it also has a bactericidal effect, which helps prevent and control crop diseases and pests. With the global emphasis on food security and sustainable agriculture, the application of thiourea in agriculture is expected to continue to grow.


Rubber industry: Thiourea, as a vulcanization promoter in the rubber industry, helps to improve the quality and production efficiency of rubber products. With the increasing demand for rubber products, the application of thiourea in this field will also continue to expand.


Metal treatment: The application of thiourea in metal corrosion inhibition helps to extend the service life of metal materials and reduce maintenance costs. Driven by the demand for corrosion-resistant materials in industries such as construction, automotive, and aviation, the market prospects for thiourea are promising.


Emerging application areas: The application of thiourea in pharmaceuticals, electronics, and other high-tech fields is also constantly expanding, providing new opportunities for its market growth.


Challenges Faced


Raw material price fluctuations: The production cost of thiourea is greatly affected by raw material prices, and price fluctuations may lead to unstable production costs, affecting market supply.


Market competition: There is a certain degree of competition in the thiourea market, mainly from domestic and foreign manufacturers. Enterprises need to enhance their competitiveness in product quality, technological innovation, marketing, and other aspects.


Environmental regulations: With the strengthening of environmental regulations, the environmental requirements for the production and use of thiourea are becoming increasingly high, and enterprises need to invest more resources in environmental governance and compliant production.


Potential Opportunities


Technological innovation: The improvement of thiourea production technology brought about by technological progress helps to improve product quality and performance, expand application scope, and promote market development.


Environmental trends: The increasing awareness of environmental protection has led to an increasing demand for environmentally friendly chemicals. As a relatively environmentally friendly compound, thiourea is expected to gain more market opportunities while meeting environmental standards.


Global market expansion: With the advancement of global economic integration, the production and consumption markets of thiourea are expanding globally, providing new market opportunities for thiourea enterprises.




The application of thiourea in metal processing and leather industry has demonstrated its important value as a multifunctional chemical. In the field of metal processing, thiourea, as an effective corrosion inhibitor, can protect metal materials from corrosion, extend their service life, and improve the performance of coatings during the electroplating process. In the leather industry, thiourea can not only improve the quality and appearance of leather, but also serve as a plant growth regulator to promote crop growth and development. At the same time, it has a bactericidal effect and is used to prevent and control crop diseases and pests.


For the future development of thiourea, the market outlook is optimistic. With the increasing global emphasis on environmental protection and sustainable development, the market demand for thiourea, as a relatively environmentally friendly compound, is expected to continue to grow. Technological innovation will promote the improvement of thiourea production efficiency and the expansion of application fields, especially in emerging fields such as medicine, electronics, and high-tech. Meanwhile, the strengthening of environmental regulations will promote a greener production process for thiourea and reduce its impact on the environment.


However, the development of the thiourea market also faces challenges such as fluctuations in raw material prices and intensified market competition. Enterprises need to continuously improve product quality, strengthen technological innovation, search for new application areas, in order to maintain competitiveness and seize market opportunities. Meanwhile, closely monitoring policy regulations and changes in market demand, and flexibly adjusting business strategies will help achieve success in the thiourea market.


In summary, the importance of thiourea in metal processing and leather industry is self-evident, and its future development prospects are broad. Through continuous technological innovation and market expansion, thiourea is expected to occupy a more important position in the global chemical market and contribute to achieving sustainable development goals.

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