Baypren 350-2

For outdoor environments, you should choose EPDM. Nitrile suits oil and fuel contact best. For mixed chemical resistance, select neoprene and chloroprene. Evaluate your project’s environmental exposure, chemical compatibility, and temperature requirements. These factors will help you make the right material choice for reliable, long-term performance.   1. Comparison Overview   Key Properties When you compare Chloroprene Rubber(such as Polychloroprene Rubber CR2440) , EPDM, and Nitrile Rubber, you need to focus on several critical properties. These include oil resistance, weathering, ozone/UV resistance, fire performance, temperature range, and cost. The table below summarizes how each material performs in these areas: Property Property Chloroprene Rubber EPDM Nitrile Rubber Oil Resistance Moderate Poor Excellent Weather Resistance Excellent Excellent Fair-Good Ozone/UV Resistance Poor Fair-Good Good Temperature Range (°F) -40 to 225 -60 to 300 -40 to 250 Cost Moderate Low-Moderate Moderate   Ozone and Weathering Resistance Table Rubber Type Ozone Resistance Weather Resistance Chloroprene Rubber Poor Excellent EPDM Fair-Good Excellent Nitrile Rubber Good Fair-Good   Fire Resistance Classification Table Material Fire Resistance Classification Chloroprene Rubber Not a fire retardant, but less flammable than other commercial rubbers; melts when aflame but can be extinguished. EPDM Good level of flame resistance; requires compounding with blockers to meet fire standards. Nitrile Rubber Not rated   2. Pros and Cons You should weigh the advantages and disadvantages of each material before making your selection. Chloroprene Rubber Pros: Offers balanced resistance to oil, chemicals, and weathering; Performs well in outdoor and marine environments; Less flammable than many other rubbers. Cons: Faces supply chain risks due to regulatory restrictions; Ozone resistance is lower than EPDM or Nitrile; Cost can be higher than EPDM. EPDM Pros: Excels in outdoor, UV, and ozone-exposed applications; Maintains flexibility at low temperatures; New formulations provide flame resistance and self-healing properties; Cost-effective for large-scale projects. Cons: Poor resistance to oils and fuel; Requires additives for optimal fire performance; Not suitable for applications involving petroleum-based fluids. Nitrile Rubber Pros: Outstanding oil and fuel resistance; Enhanced heat resistance in modern compounds; Can be blended for specialized performance, such as static dissipation; Eco-friendly options are emerging. Cons: Weathering and ozone resistance are lower than EPDM; Not inherently flame retardant; Flexibility decreases at low temperatures.   3. Choosing the Right Material Environmental Factors You need to assess the environment where your rubber material will operate. Outdoor exposure, sunlight, ozone, and weathering can quickly degrade some rubbers. EPDM stands out for its excellent resistance to ozone and sunlight, making it the top choice for outdoor applications. You benefit from EPDM’s ability to withstand harsh weather, UV rays, and temperature swings. This material can last up to 20 years or more in outdoor conditions. If your project involves exposure to oils or solvents, Chloroprene Rubber (such as Neoprene AD-20) offers good oil resistance and performs well in parts exposed to chemicals. EPDM is also more environmentally friendly because it is non-toxic and recyclable, while Neoprene (Chloroprene Rubber) is less sustainable.   Chemical Resistance You must match the rubber’s chemical resistance profile to your application. Each material reacts differently to oils, fuels, and industrial chemicals. Nitrile Rubber provides high oil resistance but performs poorly against weather and ozone. Chloroprene Rubber offers moderate oil resistance and excellent weather resistance. EPDM does not resist oils but excels in weather and ozone resistance. Rubber Type Oil Resistance Weather Resistance Flame Resistance Ozone Resistance Nitrile Rubber High Poor Poor Poor Chloroprene Rubber Moderate Excellent Very Good Excellent EPDM N/A Excellent N/A Excellent You should always check the chemicals your project will encounter. Select Nitrile Rubber for oil and fuel contact. Use Chloroprene Rubber for balanced resistance to chemicals and weather. Choose EPDM for applications with no oil exposure but high weathering demands.   4. Summary Choosing the right rubber material for your project depends on matching its properties to your application’s demands. You need to consider oil resistance, weathering, ozone and UV exposure, and the specific environment where the rubber will perform. Each rubber type offers unique strengths that make it ideal for certain uses.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com  

Chloroprene rubber adhesive is the largest and most widely used variety among rubber adhesives. It can be sorted into a few groups, like resin modified, filler, grafted, and latex types. Grafted chloroprene rubber adhesive, which is made mostly of chloroprene rubber and a grafted modifier, is known as easy to their usage, strong bonds, high initial adhesion, and many uses. As early as the 1950s, the shoemaking industry began to use chloroprene rubber adhesive. As shoemaking materials and styles change, standard chloroprene rubber adhesive may not be strong enough. This can cause the upper and sole of shoes, or composite soles, to separate. This issue harms shoe quality and limits growth in the adhesive shoe business. To solve this problem, we used a variety of graftable chloroprene rubbers at home and abroad as graft bodies and used MMA to study their grafting modification.   1 Grafting mechanism     2 Experimental part   2.1 Raw materials and polymerization formula   2.2 Polymerization Procedure Add CR to the solvent. Heat the solution to 50 °C and stir until the CR is completely dissolved. Raise the temperature to 80°C, and slowly add the MMA solution that contains BPO while stirring. Maintain the temperature and continue stirring until the viscosity reaches a suitable level (about 40 minutes). Immediately add hydroquinone to stop the reaction. Keep warm for 4 to 6 hours. After the reaction is complete, cool down to 40°C; add thickening resin, vulcanizing agent, antioxidant and filler, and finally keep warm for 2 to 3 hours, cool down to room temperature, and obtain the product. A small amount of toluene can be added to adjust the viscosity. The obtained graft copolymer (CR-MMA) is a brown-yellow transparent viscous liquid. The viscosity measures between 1000 and 1500 mPa·s. Solid content ranges from 15% to 25%, and the strength registers at 34 N/cm².   2.3 Product analysis 2.3.1 Determination of adhesive viscosity The viscosity value (mPa·s) was tested in a 25℃ constant temperature water bath using a rotary viscometer (Shanghai Optical Factory, NDI-1 type). 2.3.2 Determination of adhesive solid content The film after vacuum drying and constant weight of the adhesive was wrapped with filter paper and placed in a fat extractor. It was extracted with acetone in a 65℃ constant temperature water bath for 48 hours (to remove PMMA homopolymer in copolymerization). The solid content (W%) was calculated according to the following formula: W %=W2 / W1×100% Wherein, W1 is the mass of the grafted adhesive, and W2 is the mass of the film after vacuum drying and constant weight. 2.3.3 Determination of peel strength of artificial leather/artificial leather (PVC/PVC) bonded by adhesive The soft PVC sheet was wiped with acetone or butanone to remove the oil stains on the surface. The entire process was in accordance with GB7126-86.   3 Results and discussion   3.1 Solvent selection The solvent used in chloroprene rubber adhesive is very important. It affects the solubility of chloroprene rubber, the initial viscosity of the adhesive, stability, permeability to the adherend, bonding strength, flammability and toxicity, etc. Therefore, the selection of solvents should take into account many factors. Commonly used solvents include toluene, ethyl acetate, butanone, acetone, n-hexane, cyclohexane, solvent gasoline, etc. The test confirmed that when the solvent cannot dissolve chloroprene rubber alone, two or three solvents can be mixed in appropriate proportions to have good solubility, viscosity and low toxicity.     3.2 Effect of CR type and concentration on the performance of grafted products Different types of chloroprene rubber (CR) show differences in how quickly they form crystals and how deep their colors are. These factors can change how well the grafted materials initially stick together and how they look. Tests show that using Denka A120 Chloroprene rubber and Chloroprene Rubber SN-244X to graft chloroprene rubber results in good initial adhesion and color. The amount of CR does not change peel strength much, but it does affect how well copolymerization works. When the CR concentration is too high, that is, the viscosity is high, MMA is difficult to diffuse and has a strong tendency to self-polymerize. Maintaining the appropriate CR concentration is necessary; if it's too low, the MMA volume will be too small, which slows down the grafting copolymerization. CR concentration works best between 11% and 12%.   3.3 Effect of reaction time on the performance of grafted products Generally speaking, the longer the reaction time, the higher the grafting rate and viscosity value. At the beginning, the initial and final adhesion strengths increase with the extension of reaction time and the increase of viscosity. Extended reaction times coupled with high viscosity can actually reduce both initial and final adhesion. Experiments suggest reaction times should ideally fall between 3.0 and 5.0 hours.   3.4 Effect of reaction temperature on grafting reaction When the reaction temperature is lower than 70℃, the reaction is slow, which is due to the slow decomposition of BPO. Because BPO decomposes quickly above 90℃, leading to a rapid increase in viscosity and poorer processing, we set the reaction temperature between 80°C and 90℃.   4 Conclusion Our initial tests included scaled-up experiments and pilot production runs, which successfully yielded acceptable products. They were supplied to many leather shoe factories and achieved satisfactory results. The quality met the various standards required for shoemaking. CR-MMA grafted adhesive shows better peel strength on PVC artificial leather compared to regular CR adhesive used for boots.The addition of a small quantity of isocyanate (5-10%) can serve as a temporary curing agent. The -NCO group in the isocyanate then reacts with active hydrogen in the rubber, creating an amide bond. This reaction strengthens the rubber's internal structure, improving the overall bond strength.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com