BAYPREN 611

Chloroprene latex is a type of water-based polymer material formed from chloroprene rubber through emulsion polymerization or re-emulsification processes. This series has great adhesion, strong weather resistance, and high flame retardancy, and it can be used in many ways. The series is divided into two main types: anionic chloroprene latex (SNL series) and cationic chloroprene latex (CRL series). These types are based on different ionic properties and can be used in construction, transportation, industrial bonding, surface reinforcement, coating, and impregnation.   1. SNL Series Core Performance and Technological Advantages ♠ Superior Bonding Strength and Initial Tack In adhesive formulation design, initial tack is a key factor determining production efficiency. SNL series latexes exhibit extremely strong affinity for various substrates, including metals, fabrics, glass fibers, and even porous sponge materials. ♠ Comprehensive Environmental Resistance Unlike natural latex, which is prone to aging, the SNL series inherits the excellent properties of chloroprene rubber (CR). It possesses excellent resistance to ozone, weathering, oil, and chemical corrosion. ♠ Environmental Protection and Process Adaptability In today's increasingly stringent environmental regulations, the water-based, non-toxic, and solvent-free characteristics of the SNL series are one of its biggest competitive advantages. It not only eliminates the health and safety hazards caused by volatile organic compounds (VOCs), but also has a "non-irritating" characteristic.   2. Main Model Performance Characteristics and Application Areas 2.1 SNL-511A Anionic Chloroprene Latex SNL-511A (Neoprene 842A) is a gel-type anionic chloroprene latex with a slower crystallization rate, easy spraying, good flame retardancy, and wide material compatibility. It can be used alone or in combination with natural latex or other synthetic latexes to replace some natural latex applications. Its main application characteristics include: Fast-setting spraying application: It can be used in black asphalt waterproof coating systems, suitable for waterproofing and seepage prevention in water plants, pools, sewage tanks, underground foundation treatment, tunnel and subway construction, roofs, balconies, etc. Engineering Applications: Waterproof coatings for roads, water conservancy projects, canals, subways, etc.; seepage-proof coatings for reservoirs, underground landfills, etc.; corrosion protection and waterproofing for roof steel structure panels. Industrial Applications: Suitable for industrial coatings, impregnated products, composite material adhesives, and can also be used as a bonding substitute for sponge products. SNL-511A's flame retardancy, sprayability, and wide-range adhesion make it a commonly used variety in engineering waterproofing and industrial protective materials.     2.2 SNL-5042 Anionic Neoprene Latex SNL-5042 (Denka Neoprene 750) is characterized by strong initial tack, fast bonding speed, high bond strength, good storage stability, no need for solvents, non-toxicity, ozone resistance, oil resistance, chemical corrosion resistance, and excellent flame retardancy. Its main applications include: Water-based adhesive systems: Footwear materials, flooring, PVC flooring, foam, mattresses, fiber cloth, aluminum foil, glass cloth, etc. Building materials: Bonding of cement, mortar, adhesive mortar, etc., improving the durability and bond strength of the construction site. Transportation and Industrial Products: Adhesive materials for industries such as railway vehicles, automobiles, furniture, and electronic components. This model's fast-drying and strong adhesion characteristics make it particularly suitable for high-efficiency assembly and rapid construction scenarios. 2.3 CRL-50KL Cationic Neoprene Latex CRL-50KL (Denka Neoprene 571) is a cationic latex with positively charged emulsion particles, thus maintaining stability and preventing aggregation even in environments containing Ca²⁺ and Na⁺. Key features include: Excellent weather resistance: Ozone and aging resistant, suitable for long-term exposure environments. Good film-forming properties and high strength: Dense and high-strength film, suitable for structural applications such as waterproofing, corrosion protection, and bonding. Compatible with various substrates: Strong affinity for materials such as cement, fiber, steel, wood, and fiberglass. ♠ Main applications include: Modified bitumen waterproofing materials, rigid waterproofing layers, ship deck coatings, etc. Fiber impregnation, bonding mortars, wood protection, and fiberglass product treatment, etc. Applications include fire-retardant materials, corrosion-resistant coatings, and structural surface reinforcement. The salt resistance and high adhesion of cationic systems make them widely applicable in cement, steel, and composite materials.   3. Packaging, Appearance, and Transportation/Storage Requirements Neoprene latex products are typically white or off-white emulsions. According to available data, the SNL and CRL series products are mostly packaged in 1100 kg ± 2 kg plastic drums for easy transportation and large-scale application. Transportation and storage requirements include: Maintaining a well-ventilated and dry environment during storage and transportation, avoiding direct sunlight and high temperatures. Recommended storage temperature: 5–30℃; if the storage temperature is below 23℃, the shelf life of the product is 6 months from the date of production. Avoid damaging the packaging and keep it sealed to prevent impurities from entering and affecting stability. These storage and transportation requirements ensure that the emulsion remains uniform, non-gelling, and non-stratified before use, guaranteeing the safety and consistency of application and processing.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com

Chloroprene rubber (CR) is a synthetic rubber obtained by polymerization of chloroprene. It is widely used because of its excellent aging resistance, oil resistance, corrosion resistance and other properties. Polychloroprene Rubber CR2442 vulcanized rubber has good physical properties and can be used in many occasions (Such as chloroprene rubber adhesive). However, since the process of CR2442 in internal mixing, open mixing and vulcanization is not easy to master, the physical properties of the prepared vulcanized rubber are sometimes poor, which affects its production and application.   1. The influence of process parameters on the preparation of mixed rubber and vulcanized rubber 1.1 Internal mixer mixing process CR2442 has high requirements for the mixing process. When preparing CR2442 mixed rubber, the initial temperature, mixing time and rotor speed of the internal mixer have a great influence on the discharge temperature. The discharge temperature is an important parameter for measuring the mixing process. The optimal discharge temperature of CR2442 is 110℃. The order of adding various materials during the mixing process is also important. The correct way to add materials to CR2442 during the mixing process is: add CR2442 and small materials at the same time → add carbon black → add white carbon black and operating oil in sequence.   1.2 Mixing process of open mill After the mixed rubber prepared by the internal mixer is cooled, the vulcanization system is added on the open mill. The vulcanization system includes vulcanizing agent and accelerator. The correct way to add is to add accelerator first and then vulcanizing agent. When adding the vulcanization system to the mixed rubber on the open mill, it is generally required that there is accumulated rubber on the roller. With the shearing and extrusion of the open mill, the roller temperature will increase significantly. When the temperature of the rubber is too high, the rubber should be cut, pulled out and cooled, and then the rubber should be mixed after it is completely cooled.   1.3 Vulcanization process After adding the vulcanization system on the open mill, the rubber is cooled and placed for 16~24h before vulcanization. Since the CR2442 mixed rubber is easy to crystallize at low temperatures, it is generally necessary to perform indirect heating treatment in an oven. The vulcanization time of CR2442 was set to 30, 40, 50, 60, 70 and 80 minutes respectively. After many tests, it was found that the tensile strength and elongation at break of the vulcanized rubber were the largest when the vulcanization time was 60 minutes. Therefore, the optimal vulcanization time of CR2442 was determined to be 60 minutes.   1.4 Bonding operation In the process of bonding the mixed rubber and brass, the rubber is first cut into sheets with the same length and width as the mold. After the mold is preheated, the cut film is placed in the mold cavity. Since the mold is heated, placing it too slowly will cause early vulcanization of the rubber, reduce the fluidity of the rubber, make the bonding insufficient, and then reduce the bonding force. Therefore, the scorch time should be controlled to be much longer than the placement time of the film.   2. Influence of vulcanization system, reinforcement system and bonding system Vulcanization system: When CR2442 uses only zinc oxide and magnesium oxide for vulcanization, the resulting rubber's physical properties are worse compared to when zinc oxide, magnesium oxide, sulfur, and accelerator DM are used as a system. Reinforcement system: The reinforcement system of CR2442 is often based on carbon black and supplemented by white carbon black. Bonding system: Rubber as a single material can no longer meet the needs of society, and it is often necessary to bond rubber to metal to expand its scope of use. CR2442 is usually bonded to metal using a resorcinol-methylene-white carbon black-cobalt salt bonding system.   3. Conclusion When mixing, it's important to think about temperature, how long you mix, and how fast the rotor spins. Also, when you add the vulcanization system using the open mill, pay attention to the order you add things. The heat from the rollers can really change things.For vulcanization and bonding, if you make sure the scorch time is longer than it takes to place the sample, you can get better quality vulcanized rubber and better bonding with other types of materials. The CR2442 discharge temperature matters too. It's a good idea to add white carbon black as a reinforcement in CR2442. This helps control how fast vulcanization and bonding happen.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com