Development and application of new processes and materials
launch:
2024-01-09
Although natural latex has a prominent feature of containing water-soluble proteins, poor aging resistance (film crystallization), and air tightness, its outstanding comprehensive performance is difficult for other materials to achieve. Practice has proven that it is impractical to completely replace natural latex with synthetic materials, and it is not possible to completely replace it with synthetic latex at this stage or even for a longer period of time. In view of this, starting from raw materials to remove proteins or deproteinize natural latex is the preferred way to develop new materials and processes. The new processes that have been successfully developed internationally mainly include: ① Deproteinization using proteases to remove removed or free proteins. The main mechanism is to add certain natural
Although natural latex has a prominent feature of containing water-soluble proteins, poor aging resistance (film crystallization), and air tightness, its outstanding comprehensive performance is difficult for other materials to achieve. Practice has proven that it is impractical to completely replace natural latex with synthetic materials, and it is not possible to completely replace it with synthetic latex at this stage or even for a longer period of time. In view of this, starting from raw materials to remove proteins or deproteinize natural latex is the preferred way to develop new materials and processes. The new processes that have been successfully developed internationally mainly include: ① Deproteinization using proteases to remove removed or free proteins. The main mechanism is to add certain natural enzyme preparations to natural latex, which decompose the proteins in the latex under alkaline conditions. Then, water and surfactants are added to the latex, and centrifugation and separation are carried out using a centrifuge White carbon black treatment method. ③ Radiation method. ④ Other methods. The natural latex processed by the above methods can greatly eliminate its existing protein, fully meeting the needs of manufacturing medical and health products. Secondly, we should start from natural latex products to reduce the protein content in latex products. In order to block the allergens in natural latex, increase the smoothness of the surface of natural latex gloves and other products, and make them powder free and easy to wear, there are also new processes abroad to solve the protein problem by coating natural latex gloves and other products with non viscous water-based polymer lotion. British CRC Manufacturing Company and American Podell Company jointly developed a kind of hydrogel lotion for glove coating and realized industrial production. Another new process for reducing the protein content in natural latex products is to form natural latex products on the model, and then rinse them with rinsing solution before and after demolding. After rinsing with the rinsing solution, the protein content in the latex can be reduced to ≤ 50% μ G/g, the rinsing solution can also take away the remaining powder on the gloves, thus making low protein, powder free natural latex gloves. Another method is the chlorination treatment process specifically designed for inspecting gloves. Malaysia and other countries have developed a powder free glove production technology, which uses the method of adding an isolation agent to the coagulant, chlorine treatment on the outside of the gloves, and the treated gloves can be automatically demolded. After demolding, they can be directly packaged to achieve the goal of powder free, which is called a one machine completion process. However, this method faces environmental protection issues. Another production process for powder free gloves is to use an online production process, which involves first immersing the hand shaped model in a coagulant, and then immersing the model in latex to produce latex products. Before removing the model, apply a polymer on the gloves (which can improve the coating performance). This new coagulant formula makes the product easy to demold, easy to double coat, and eliminates the need for offline operations.
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