PVC plasticizer Migration and extraction of serious will make a large change in products, resulting in products softening, sticky, and even surface rupture, precipitates often cause product pollution, but also affect the products of two processing, therefore, to deal with and solve the problem of PVC plasticizer is an urgent project.
how to deal with this phenomenon?
1, Add polyester plasticizer: Polyester plasticizer and DOP and other small molecule plasticizer have a good affinity when the PVC plasticizing material has a certain amount of polyester plasticizer, can play to attract and fixed other plasticizers do not surface diffusion of PVC products, thereby reducing and preventing the transfer and extraction of plasticizers.
2, Adding nanoparticles: Adding nanoparticles can reduce the transfer loss rate in soft PVC and improve the performance and life of soft PVC materials. The ability of different nanoparticles to inhibit plasticizer migration is different, and the nano-SiO2 effect is better than nano-CaCO3.
3, The use of ionic liquids: ionic liquids in a larger temperature range to control the glass of the polymer temperature, the addition of its material modulus of elasticity and the use of DOP as a plasticizer is equivalent. Because the ionic liquid at high-temperature volatilization small, its leaching low, UV stability is good, is an ideal substitute for the plasticizer.
4, Surface spraying protective coating: the polymer surface coated with a layer of non-migrating substances to reduce the leaching and migration of plasticizers, the disadvantage of this method is likely to cause a decline in material flexibility, but the experimental results show that this coating technology can effectively prevent the leaching of plasticizers, in the field of medical PVC has wide application prospects.
5, Surface Association: In the water with the appropriate phase transfer catalyst, the use of sodium sulfide to the plasticizer surface modification, under light action, so that the surface of PVC products to form a network structure, can effectively prevent the migration of plasticizers. The soft PVC, which is processed by this method, is suitable for use in medical and related equipment. 6. Surface modification: The leaching of the plasticizer in the polymer can be controlled by adjusting the properties of the polymer surface, and in many modification techniques, the surface graft-soluble polymer is one of the main directions. The method of grafting PEG on the surface of soft PVC is suggested to enhance the hydrophilicity of the substrate surface, so as to inhibit the leaching of plasticizer.
Will solve this phenomenon is good, but know how to prevent PVC plasticizer precipitation is the fundamental solution to this phenomenon, generally add plasticizer anti-migration agent, effectively prevent the oil problem of plasticizer. Adding a small amount of plasticizer anti-migration agent DF-11 in PVC, can make the coupling between PVC resin and plasticizer, increase the molecular force between each other, so as to prevent the small molecule plasticizer from migrating to the product surface and resulting in oil.