Henan Niujiao Industrial Co., Ltd.
Niujiao Chemical specializes in supplying a variety of chemical products, focusing on the research and development, production and trade of various chemical raw materials and products, relying on superior product quality exported to more than countries and regions.
Why Choose Us
Wide Range of Additives
We offer a comprehensive range of rubber additives, including accelerators, antioxidants, and more. Our diverse product portfolio caters to various rubber formulations and applications, providing comprehensive solutions for our customers.
High-Quality Manufacturing
Our manufacturing facilities employ advanced technologies and adhere to stringent quality control measures. We prioritize quality in every step of the production process, ensuring consistent and high-performance rubber additives that meet international standards.
Customization Capabilities
We understand that each customer may have unique requirements. We have the flexibility to customize our rubber additives to meet specific formulation needs, ensuring optimal compatibility and performance in various rubber applications.
Competitive Pricing
We understand the importance of cost-effectiveness in the. With a complete range of varieties and specifications, favorable prices, and excellent services, it has a good reputation in the market, won more and more customers, and reached a mutually beneficial cooperative relationship.
The use of Rubber Vulcanizing Agents
In natural rubber, the combination with sulfur can prevent vulcanization return, improve heat resistance, reduce heat generation, and aging resistance, and improve the adhesive force of rubber and cord and the modulus of vulcanized rubber. It can be used for shoulder rubber, buffer layer, and other rubber of truck tires, which can solve the problem of shoulder clearance of inclined truck tires, and can also be used for large thick products of natural rubber and various rubber miscellaneous products.
Henan Niujiao Industrial Co., Ltd., under the reputable Niujiao brand, presents Tetramethylthiuram Disulfide (TMTD), a vital compound with a wide range of applications in various industries. With a CAS number of [137-26-8] and a molecular formula of C6H12N2S4, TMTD is renowned for its efficacy as an accelerator in rubber vulcanization processes.
TMTD, offered by Niujiao, plays a pivotal role in enhancing the curing speed and efficiency of rubber compounds, leading to improved mechanical properties and heat resistance in the final products. This versatile accelerator is widely utilized in the production of tires, automotive parts, industrial rubber goods, and more.
Niujiao's TMTD is manufactured to the highest quality standards, ensuring consistent performance and reliability in rubber processing applications. With a focus on innovation and customer satisfaction, Henan Niujiao Industrial Co., Ltd. provides a trusted source of TMTD for industries seeking superior rubber additives.
Experience the exceptional quality and performance of TMTD from Henan Niujiao Industrial Co., Ltd., setting new standards for excellence in rubber accelerator technology.
What are the Examples of Vulcanizing Agent?
Vulcanizing agents are chemicals used to induce the cross-linking process in rubber to improve its properties. Here are several examples of vulcanizing agents commonly used in the rubber industry:
Sulfur
The most traditional and widely used vulcanizing agent, sulfur forms disulfide bonds between the rubber polymer chains.
Selenium and Tellurium
These elements, like sulfur, can form cross-links in rubber but are less common due to cost and availability issues.
Thiourea and Thiurams
Chemical compounds containing sulfur act as accelerators, speeding up the vulcanization process by facilitating the cross-linking reactions between sulfur and the rubber matrix.
Quinones (such as Toluenequinone and p-Benzoquinone)
Quinones (such as Toluenequinone and p-Benzoquinone)
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Peroxides
Chemical compounds initiate a free radical reaction to create cross-links in the rubber. They are often used in conjunction with coagents that decompose upon heating to form free radicals.
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Zinc Oxide and Stearic Acid
While not directly cross-linking the rubber, these compounds are often used as accelerators and activators to enhance the effectiveness of primary vulcanizing agents and accelerators.
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Polyols (Such as Ethylene Glycol and Propylene Glycol)
Used as plasticizers and sometimes as coagents in peroxide vulcanization systems.
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Each vulcanizing agent or accelerator has specific properties that make it suitable for different types of rubber and desired end-product characteristics. The choice of vulcanizing system depends on the type of rubber being processed, the requirements of the final product, and the manufacturing process.
What are the Advantages of Vulcanized Rubber?
Vulcanized rubber offers several advantages over its non-vulcanized counterpart due to the chemical cross-linking process it undergoes:
1. Enhanced Strength
Vulcanization significantly improves the tensile strength of rubber, making it capable of withstanding greater stress before breaking.
2. Improved Elasticity
While maintaining flexibility, vulcanized rubber exhibits better elastic recovery after deformation. This means it can bounce back to its original shape more effectively.
3. Heat Resistance
Vulcanized rubber is less prone to melting or deteriorating when exposed to high temperatures, making it suitable for applications where heat resistance is required.
4. Reduced Sticking
The cross-linked structure prevents vulcanized rubber from sticking to metal surfaces, which is essential in manufacturing processes and for the longevity of rubber products in contact with metals.
5. Chemical Resistance
Vulcanized rubber shows increased resistance to oils, fats, and acids, which makes it ideal for use in harsh chemical environments.
6. Better Ageing Properties
The vulcanization process reduces the rate at which rubber degrades when exposed to oxygen and ultraviolet light, thereby extending the service life of rubber products.
7. Processability
Vulcanized rubber can be more easily processed and shaped during manufacturing, which allows for the creation of complex designs and products with tighter tolerances.
8. Electrical Insulation
Certain types of vulcanized rubber have excellent insulating properties, making them valuable in electrical applications.
9. Reduced Odor and Volatility
Vulcanization stabilizes the rubber, reducing the emission of volatile organic compounds (VOCs) and unpleasant smells.
These properties make vulcanized rubber a material of choice for a wide range of products including automobile tires, seals, hoses, conveyor belts, footwear, and gaskets, among others. Its versatility and durability make it indispensable in modern engineering and manufacturing.
Application of Rubber Vulcanizing Agent PDM
PDM (Polyfunctional Disubstituted Methylene) is a type of peroxide vulcanizing agent used in the rubber industry. Peroxides like PDM are characterized by the presence of two reactive sites within each molecule, enabling them to cross-link rubber polymers efficiently during vulcanization. The application of PDM in vulcanizing rubber offers several benefits:
High Vulcanization Speed
PDM provides rapid vulcanization, which is advantageous for high-speed production lines and for processing rubbers that require quick curing times.
Good Aging Properties
Rubber vulcanized with PDM tends to have improved aging characteristics, maintaining its mechanical properties over extended periods.
Efficient Cross-Linking
The polyfunctional nature of PDM allows for efficient cross-linking of the rubber chains, leading to enhanced mechanical strength and durability of the vulcanized product.
Low Residual Content
After vulcanization, PDM decomposes to form free radicals, which initiate cross-links without leaving behind a significant amount of unreacted residue in the rubber.
Color Stability
PDM does not impart color to the rubber, making it suitable for processing color-sensitive compounds.
Processing Ease
Products vulcanized with PDM can exhibit improved flow and mold release characteristics, which eases the manufacturing process and reduces the potential for defects.
Compatibility with Fillers
PDM can effectively vulcanize rubber compounds containing various fillers, which is important for achieving the desired physical properties in rubber goods.
Thermal Oxidative Stability
Rubber vulcanized with PDM shows enhanced resistance to thermal oxidative degradation under conditions of elevated temperature and air exposure.
PDM is utilized in a variety of rubber compounds, including those made from natural rubber (NR), synthetic rubber such as styrene-butadiene rubber (SBR), and specialty rubbers like fluorocarbon rubber (FKM) and ethylene propylene diene monomer (EPDM). The choice of vulcanizing agent, including PDM, depends on the specific requirements of the rubber product in terms of processing, performance, and cost.
What is the Function of a Vulcanizing Agent?
A vulcanizing agent plays a crucial role in the vulcanization process of rubber. Its main functions are as follows:
1. Formation of cross-links: The vulcanizing agent helps to create chemical bonds between the rubber molecules, forming a three-dimensional network. These cross-links enhance the strength, elasticity, and durability of the rubber.
2. Improve properties: By cross-linking the rubber, the vulcanizing agent improves various properties such as tensile strength, tear resistance, abrasion resistance, and heat resistance.
3. Stabilization: Vulcanization helps to stabilize the rubber, making it more resistant to degradation and aging. It increases the material's resistance to chemicals, heat, and oxygen.
4. Adjustment of properties: Different vulcanizing agents can be selected to achieve specific property requirements. This allows for customization of the rubber's hardness, elasticity, and other characteristics.
5. Enhance processability: The vulcanizing agent affects the processing properties of the rubber, making it easier to mold, extrude, or shape during manufacturing.
What is the Vulcanizing Agent for Neoprene?
Neoprene, also known as polychloroprene, can be vulcanized using various vulcanizing agents. Some common vulcanizing agents used for neoprene include:
- Sulfur: Sulfur is the most commonly used vulcanizing agent for neoprene. It helps form cross-links within the neoprene molecules, resulting in increased strength and elasticity.
- Peroxides: Peroxides, such as dicumyl peroxide, can also be used as vulcanizing agents for neoprene. They provide a faster vulcanization rate and can result in better heat resistance.
- Zinc oxide: Zinc oxide is often used as an activator or accelerator in the vulcanization process. It helps to speed up the reaction between the vulcanizing agent and the neoprene.
- Mercaptans: Mercaptans, such as tetramethylthiuram disulfide, are sometimes used in combination with sulfur to enhance the vulcanization process and improve the properties of the neoprene.
- Resins: Some resins, like phenolic or resorcinol formaldehyde resin (RFR), can be added to the neoprene compound to improve adhesion and mechanical properties.
The choice of vulcanizing agent depends on the specific requirements of the neoprene product, such as the desired hardness, elasticity, and heat resistance. The formulation of the neoprene compound may also include other additives and fillers to further modify its properties.
It's important to note that the vulcanization process requires careful control of temperature, time, and other factors to achieve the desired results. Additionally, safety precautions should be followed when handling and using vulcanizing agents, as they can be reactive and potentially hazardous.
What is the Characteristics of Vulcanization?
Vulcanization is a process that brings about several characteristic changes in rubber. Here are some of the notable characteristics of vulcanization:
1. Formation of cross-links: Vulcanization creates a network of chemical bonds within the rubber molecules. These cross-links enhance the rubber's strength, elasticity, and durability.
2. Increase in hardness and stiffness: As the rubber undergoes vulcanization, it typically becomes harder and stiffer. This is due to the formation of cross-links.
3. Improvement in elasticity: While the rubber becomes harder, it also gains better elasticity. The cross-links allow the rubber to deform and return to its original shape more effectively.
4. Enhanced resistance to deformation: Vulcanization makes the rubber more resistant to deformation and stretching. It increases the material's tensile strength and tear resistance.
5. Increased heat resistance: The vulcanization process often improves the rubber's heat resistance, making it more capable of withstanding higher temperatures without significant degradation.
6. Better chemical resistance: Vulcanized rubber exhibits enhanced resistance to chemicals, acids, and alkalis, making it more suitable for applications in harsh environments.
7. Stable properties: Vulcanization helps to stabilize the properties of the rubber, reducing the likelihood of changes over time and increasing its longevity.
These characteristics are what make vulcanized rubber suitable for a wide range of applications, from tires and seals to hoses and gaskets. The specific properties can be tailored by varying the type and amount of vulcanizing agent, as well as other formulation parameters.
What is the Difference Between Primary and Secondary Accelerators?
Primary and secondary accelerators are two types of chemicals used in the vulcanization process of rubber. Here are some of the differences between them:
Function: Primary accelerators typically play a major role in initiating and speeding up the vulcanization reaction. Secondary accelerators, on the other hand, may have a lesser effect but can enhance the efficiency of the primary accelerator or modify the vulcanization kinetics.
Reaction speed: Primary accelerators usually provide a faster onset of the vulcanization process. Secondary accelerators may have a more delayed or controlled reaction, allowing for better control of the vulcanization rate.
Specific effects: Different primary and secondary accelerators can have varying effects on the properties of the vulcanized rubber. Some may influence the hardness, elasticity, or heat resistance of the final product.
Compatibility: The compatibility of accelerators with other rubber compounds and additives can also differ. Some accelerators may be more suitable for specific types of rubber or formulations.
Dosage: The amount of primary and secondary accelerators used in the formulation can vary. Primary accelerators are often used in smaller quantities compared to secondary accelerators.
Heat sensitivity: Some accelerators may be more sensitive to temperature during the vulcanization process. Higher temperatures can accelerate the reaction, while lower temperatures may slow it down.The choice of primary and secondary accelerators depends on the specific requirements of the rubber product, the vulcanization conditions, and the desired properties of the final material. Formulators often carefully select and balance the use of accelerators to achieve the optimal vulcanization characteristics.
What are the Classification of Accelerators for Rubbers?
Rubber accelerators are classified based on their chemical structure and mechanism of action. The main categories include:
1. Primary Accelerators
Also known as thiazoles, these accelerators are used primarily for natural rubber (NR) and have a slower scorch time, which allows for longer working times before the compound begins to cure. Examples include thiourea dioxide (TMTD) and thiocarbamates such as diethyl thiourea (DETU) and diphenyl thiourea (DPTU).
2. Secondary Accelerators
These are also known as acylamides. They are used to prevent premature vulcanization (scorching) and to improve the physical properties of the vulcanizate. Examples include N-cyclohexyl-2-benzothiazole sulfonamide (CBS) and N-tert-butyl-2-benzothiazole sulfenamide (TBBS), also known as TBS.
3. Tertiary Accelerators:
Also known as guanidines, these accelerators have a fast scorch time and are often used in combination with primary and secondary accelerators. They are particularly effective in sulfur-vulcanized systems. Examples include diphenylguanidine (DPG) and N,N'-dicyclohexylguanidine (DICY).
Also known as thiurams and xanthates, these are often used in conjunction with peroxide cures and are effective in preventing the migration of sulfur. Examples include tetramethylthiuram disulfide (TMTDS) and zinc diethyldithiocarbamate (ZDEC).
These are a subcategory of secondary accelerators and are widely used due to their effectiveness and versatility in various types of rubber. Examples include N-cyclohexylbenzothiazole sulfenamide (CBS) and N-t-butyl-2-benzothiazole sulfenamide (TBBS).
Each type of accelerator has its own set of properties and is chosen based on the specific requirements of the rubber compound, such as the desired cure rate, final properties of the vulcanizate, and compatibility with other additives and curing systems. Accelerator selection is also influenced by the type of rubber being processed, the end-use application, and cost considerations.
Our Factory
Niujiao Chemical specializes in supplying a variety of chemical products, focusing on the research and development, production and trade of various chemical raw materials and products, relying on superior product quality exported to more than countries and regions. With a complete range of varieties and specifications, favorable prices and excellent services, it has a good reputation in the market, won more and more customers, and reached a mutually beneficial cooperative relationship.
Products Description
Q: What is the characteristics of vulcanization?
Q: What are the classification of accelerators for rubbers?
The most popular accelerators are delayed-action sulfenamides, thiazoles, thiuram sulfides, dithocarbamates and guanidines. Part or all of the sulfur may be replaced by an accelerator that is also a sulfur donor such as a thiuram disulfide.
Q: What is the difference between primary and secondary accelerators?
Q: What is the characteristics of vulcanization?
Q: What is the accelerator of vulcanization of rubber?
Q: What chemical is used for accelerating vulcanization?
Q: What are the disadvantages of vulcanization of rubber?
Q: Which is better TBBS or CBS accelerator?
Q: What property changes occur during vulcanization?
Q: Can vulcanization reversed?
Q: Can you reverse vulcanized rubber?
Q: Does vulcanized rubber absorb water?
Q: Is vulcanized rubber stretchy?
Q: What happens to vulcanized rubber after it has been stretched?
Q: Is vulcanizing permanent?
Q: Why does vulcanized rubber not melt?
Q: Why does vulcanized rubber smell?
Q: Is PVC vulcanized rubber?
Q: What temperature is needed for rubber vulcanization?
Q: Is vulcanization reversible?
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