CHEMOTEX 225

In the polyvinyl chloride (PVC) suspension polymerization process, selecting the right suspending agent is crucial for controlling polymer particle morphology, particle size distribution, and porosity. Both ALCOTEX B72 and its modified version, ALCOTEX B72-LF, are high-performance polyvinyl alcohol (PVA) specifically developed as primary suspending agents for VCL suspension polymerization. B72 and B72-LF share similar applications and properties, but B72-LF is designed to solve a frequent problem in polymerization. Here, we will compare the technical specs, benefits, and proper uses of both B72 and B72-LF. This information should guide PVC manufacturers to select the right product for their specific needs.     1. Comparison of Core Technical Parameters Property ALCOTEX B72  ALCOTEX B72-LF Appearance Dark yellow granulesanules Dark yellow granulesanules Degree of Hydrolysis 72.0-74.0 72.0-74.0 Viscosity @ 20℃, 4% solution 5.0-5.8 5.0-5.8 Ash Content 0.5 max 0.5 max Total Solids > 95.0 > 95.0   2. Differentiation of Application Advantages—Process Optimization vs. Product Quality The advantages of ALCOTEX B72 primarily focus on reducing operating costs and improving PVC polymer quality. The ALCOTEX B72-LF builds upon this foundation with enhanced process stability.   2.1 Shared Quality Advantages of the B72/B72-LF Reactor Output and Cost: Low fouling in polymerization reactors reduces downtime for cleaning. Required particle size control can be achieved at lower concentrations. Particle Morphology and Flowability: The resulting PVC particles tend to be more spherical, helping to minimize bulk density reduction at high porosity, resulting in optimal flow properties. Porosity and Degassing: The produced PVC particles exhibit good porosity, facilitating the removal of free monomers. Defect Control: Narrow particle size distribution and low oversized reject rate. Low "fisheye" count reduces reject levels in critical applications. Plasticizer Absorption: Adjustable plasticizer absorption properties provide fast drying times. Operational Characteristics: Low dust generation.   2.2 B72-LF's Unique Advantage: Anti-Foaming Properties Foaming is a common process obstacle in suspension polymerization, potentially leading to reduced reactor charge, increased reactor wall fouling, and even impacting polymerization stability. ALCOTEX B72-LF was specifically developed to address this foaming issue. It offers the added benefit of reducing foaming during S-PVC polymerization. Process Benefits: By minimizing foaming during suspension polymerization, B72-LF can help manufacturers maintain or improve throughput and production efficiency. Comparative Conclusion: B72 focuses on providing comprehensive, high-quality PVC product specifications and excellent operating characteristics. B72-LF builds on this strength, offering manufacturers struggling with foaming a process solution without compromising PVC quality.   3. Similarities in Storage and Logistics Both products demonstrate high consistency in storage and supply, facilitating standardized supply chain management and operational procedures: Storage Conditions: Both products should be stored in a dry area, and moisture ingress must be avoided to maintain product quality. Shelf Life: As supplied, both products should maintain suitability for 24 months from the date of production. Testing Recommendations: Both products recommend testing before use for materials stored for 12 months or longer. Aqueous Solutions: Aqueous solutions of both products are susceptible to mold and bacterial attack if stored at elevated temperatures for extended periods. Packaging: Both products are supplied in 25 kg plastic bags and 1000 kg bulk bags.   4. Application Selection Recommendations ALCOTEX B72: Standard Process: Stable process operation with minimal foaming issues. The primary goal is to achieve high-quality PVC pellets and low operating costs. Cost-Effectiveness and Quality Assurance: Achieve excellent particle size, porosity, flowability, and low defectivity with minimal investment. ALCOTEX B72-LF Challenging Process: Significant foaming tendency during polymerization, or manufacturers seeking to maximize reactor load and throughput. Process Optimization and Efficiency Improvement: Maintains all the quality advantages of B72 while providing strong anti-foaming properties, ensuring stable and efficient production processes.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com

Polyvinyl alcohol (PVA), a water-soluble synthetic polymer, is widely used in textiles, papermaking, construction, coatings, and other fields due to its excellent film-forming, adhesive, emulsifiable, and biodegradable properties. However, standard PVA may have performance limitations (such as water resistance, flexibility, and redispersibility) in certain specific applications. To overcome these challenges, scientists have developed a series of modified PVAs by introducing various functional groups or modifying the polymerization process. Compared to standard PVA, these modified PVA exhibit significant performance advantages in many aspects. 1. Better Water Resistance and Stickiness The abundance of hydroxyl groups (-OH) in the standard PVA molecular chain makes it extremely hydrophilic. However, this also means that it is prone to swelling and even dissolution in hot and humid environments, resulting in reduced bond strength. Modified PVA, by introducing hydrophobic functional groups (such as acetyl and siloxane groups) or through crosslinking reactions (such as boric acid crosslinking and aldehyde crosslinking), can effectively reduce its swelling in water, significantly improving its water resistance. For example, in dry-mix mortars for construction, modified PVA used in tile adhesives can form a more stable and moisture-resistant bond, ensuring that tiles will not fall off due to moisture erosion during long-term use. These modifications also enhance the cohesion between PVA molecular chains, strengthening its adhesion to various substrates (such as cellulose and inorganic powders), thereby imparting higher cohesive and adhesive strength to the final product.   2. Optimized Redispersibility and Compatibility Certain applications, such as the production of redispersible polymer powders (RDPs), place stringent requirements on the redispersibility of the polymer. Standard PVA, used as a protective colloid, can easily cause emulsion particles to agglomerate during the spray drying process, affecting the final properties of the RDP. Modified PVA, such as partially alcoholyzed PVA with a high degree of polymerization, produced through specialized polymerization processes, or PVA containing specific hydrophilic/hydrophobic segments, can more effectively stabilize emulsion systems. The protective layer they form after drying allows for rapid and uniform redispersion upon re-addition of water, even after prolonged storage, restoring the original emulsion state. This optimized redispersibility is crucial for ensuring the workability of products such as dry-mix mortar and putty powder. Furthermore, the introduction of specific functional groups into modified PVA can improve its compatibility with certain additives (such as cellulose ethers and starch ethers), reducing system interactions and flocculation, thereby achieving synergistic effects within the formulation and achieving more stable and efficient product performance.   3. Broader Application Potential and Customizable Performance While standard PVA has relatively fixed properties, the customizability of modified PVA opens up a wider range of applications. Through precise chemical modification, PVA can be endowed with a variety of customized properties to meet the stringent requirements of specific industries. For example, silane-modified PVA can significantly improve its adhesion and alkali resistance in cementitious materials; vinyl acetate-modified PVA offers enhanced flexibility and lower film-forming temperatures; and certain bio-modified PVAs may find new applications in the biomedical field. This ability to be "functionalized" to meet specific needs elevates modified PVA from simply a basic raw material to a high-performance additive capable of solving specific technical challenges.   In summary, while standard PVA remains indispensable in many fields, modified PVA, with its significant advantages in water resistance, adhesive strength, redispersibility, and customizability, has achieved a leap from "general purpose" to "specialized," and from "passive" to "intelligent." Whether pushing the performance limits of traditional applications or pioneering cutting-edge technologies such as biomedicine, environmental engineering, and smart materials, modified PVA (such as PVOH 552) demonstrates immense potential and is undoubtedly a key direction for the future development of polymer materials.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com

Gloves are the most commonly used protective tools in the laboratory besides goggles. There are many types of gloves, and different gloves have different uses.     1. Natural rubber (latex) Latex gloves, made from natural rubber, typically lack a lining and are available in both clean and sterile versions. These gloves can provide effective protection against alkalis, alcohols, and a variety of chemical dilution aqueous solutions, and can better prevent corrosion from aldehydes and ketones.   2. Polyvinyl chloride (PVC) gloves The gloves do not contain allergens, are powder-free, have low dust generation, low ion content, strong chemical corrosion resistance, can protect almost all chemical hazardous substances, and also have anti-static properties. Thickened and treated surfaces (such as fleece surfaces) can also prevent general mechanical wear, and thickened types can also prevent cold, with an operating temperature of -4℃ to 66℃. Can be used in a dust-free environment. PVC gloves grading standards: Grade A products, no holes on the surface of the gloves (PVC gloves with powder), uniform powder, no obvious powder, transparent milky white color, no obvious ink spots, no impurities, and the size and physical properties of each part meet customer requirements. Grade B products, slight stains, 3 small black spots (1mm≤diameter≤2mm), or a large number of small black spots (diameter≤1mm) (diameter>5), deformation, impurities (diameter≤1mm), slightly yellow color, serious nail marks, cracks, and the size and physical properties of each part do not meet the requirements.   3. PE gloves PE gloves are disposable gloves made of polyethylene. These gloves are waterproof, oil-proof, anti-bacterial, and resistant to acids and bases. Note: PE gloves are safe to use with food and are non-toxic. It is better to keep PVC gloves away from food, especially if it's hot.     4. Nitrile rubber gloves Nitrile rubber gloves are usually divided into disposable gloves, medium-duty unlined gloves and light-duty lined gloves. These gloves can prevent erosion by grease (including animal fat), xylene, polyethylene and aliphatic solvents; they can also prevent most pesticide formulations and are often used in the use of biological components and other chemicals. Nitrile rubber gloves do not contain protein, amino compounds and other harmful substances, and rarely cause allergies. They are silicone-free and have certain antistatic properties, which are suitable for the production needs of the electronics industry. They have low surface chemical residues, low ion content and small particle content, and are suitable for strict clean room environments.   5. Neoprene gloves Similar to the comfort of natural rubber, neoprene gloves are resistant to light, aging, flexing, acid and alkali, ozone, combustion, heat and oil.   6. Butyl rubber gloves Butyl rubber is only used as a material for medium-sized unlined gloves and can be used for operations in glove boxes, anaerobic boxes, incubators, and operating boxes; it has super durability against fluoric acid, aqua regia, nitric acid, strong acids, strong alkalis, toluene, alcohol, etc., and is a special rubber synthetic resistant liquid gloves.   7. Polyvinyl alcohol (PVA) gloves Polyvinyl alcohol (PVA) can be used as a material for medium-sized lined gloves, so this type of gloves can provide a high level of protection and corrosion resistance against a variety of organic chemicals, such as aliphatic, aromatic hydrocarbons, chlorinated solvents, fluorocarbons and most ketones (except acetone), esters and ethers.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com

The shift toward green packaging in the food industry is imperative.   Flexible packaging is becoming really important in the food industry. This product is safe for the environment and doesn’t contain any toxic materials. Unlike PVDC, it leaves no solvent residues and doesn’t release harmful gases when burned, so it’s a better choice for sustainability.   Under the same conditions, its oxygen barrier performance is 50 times higher than that of PVDC, effectively addressing many challenges in the packaging industry.   Polyvinyl alcohol (PVC Grade) coated film is a novel, eco-friendly, high-barrier packaging material that can replace PVDC in general food packaging applications while also meeting stricter environmental requirements in other packaging fields.   Differences Between PVOH High-Barrier Coated Film and K-Film     1. Structure: Self-adhesive, no primer required.        2. Performance:   Eco-friendly & Cost-Efficient: Low coating weight, no organic solvents used, no solvent emissions or residues. Superior Oxygen Barrier: Thinner coating, lower haze, higher transparency, and exceptional oxygen barrier performance. Higher Yield: It offers a bigger packaging area, about 15% more per roll than K-film of the same weight and width, which means you can pack more products. . Recyclability: The PVOH-coated film is both degradable and recyclable.   In summary, this eco-friendly PVOH (PVOH 552 & Aclotex B72) -coated film could fill a gap in the market. It can replace traditional PVDC in food packaging and meet the needs of industries focused on environmental issues. Plus, it effectively handles current sustainability challenges and provides good oxygen barriers for flexible food packaging.It's likely to take the place of a lot of metallized film packaging out there.   This new product is designed to tackle the ongoing issue of plastic waste in food packaging and support the move towards eco-friendly materials in China.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com