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Extraction and migration of plasticizers of polyvinyl chloride (PVC)
2017-12-24 14:10:48
Extraction and migration of plasticizers of polyvinyl chloride (PVC)
This paper introduces polyvinyl chloride (PVC) plasticizer migration and extraction of the harmfulness and the basic principle, focuses on the effects of polyvinyl chloride (PVC) by the main factors, plasticizer migration and extraction such as plasticizer molecular weight and molecular structure, environment temperature, plasticizer content, media and time.
Various solutions and research results that can effectively inhibit the extraction and migration of polyvinyl chloride (PVC) plasticizers, mainly include adding polyester plasticizers, adding nanoparticles, using ionic liquids, surface modification, surface crosslinking, surface spraying protective coatings, etc.
Soft polyvinyl chloride (PVC) products contain certain plasticizer components. These plasticizers will migrate, extract and volatilize at different degrees in the two processing and using processes.
Plasticizer loss will not only cause the deterioration of PVC products performance, but also cause contamination of the products surface and contacts. More serious is that it will bring a series of problems to the environment and human health. Therefore, the migration and extraction of plasticizers has become a major obstacle to the wide application of soft PVC products.
The adverse consequences of the migration and extraction of plasticizers. When plasticizer migrates and draws seriously in PVC, it will cause great changes in products, causing products to soften, stick, or even break. The precipitates often cause product contamination, and also affect the two processing of products.
For example, the migration of plasticizer molecules in PVC waterproofing membrane and the shrinkage and hardening of PVC after losing plasticizer can lead to failure of waterproof function.
When soft PVC products are pasted with general solvent adhesives, plasticizers in the products often migrate to the adhesive layer, causing the sharp drop of bond strength, resulting in problems such as lack of bond or degumming. When the soft PVC products are painted or painted, they are also faced with the problem of the coating or coating loss caused by the extracted plasticizer.
PVC printing, plasticizer is out of ink and printing manufacturing taboo. Some components such as pigment particles, flavors, antistatic agents, stabilizers and so on will also be brought out in the process of plasticizer precipitation in PVC. Due to the loss of these components, the physical properties of PVC products will decline, and some properties will even be lost.
These precipitates will also pollute and destroy the substances that are closely related to them. If the soft PVC and polystyrene products are put together, the plasticizer migrated by PVC will affect the performance of polystyrene products and cause the softening of polystyrene products.
Physical and chemical properties of two octyl terephthalate (plasticizer DOTP)
Appearance: transparent and colorless liquid
Boiling point: 400 degrees centigrade
Density: 0.984
Melting point: 30-34 degrees centigrade
Flash point: 238 degrees centigrade
Refractive index: 1.489-1.491
Flash point centigrade 210
Water is less than or equal to 0.03
Acid value is less than 0.1 mgKOH/g
The refractive index is greater than or equal to 1.4900 (20 C)
Color = (platinum cobalt) 30
The ester content% (chromatography) more than 99.5
Density (20 C) g/cm3 0.981-0.985
Use of two octyl terephthalate (plasticizer DOTP)
1.DOTP has good electrical and thermal properties. It can be used to replace DOP in the sheath of PVC plastic wire and can also be used in the production of artificial leather membrane. In addition, with excellent compatibility, terephthalic acid ester is two PVC acrylonitrile derivatives plastic plasticizer, plasticizer, plasticizer, polyvinyl butyral nitrile rubber plasticizer, plasticizer for cellulose nitrate. The improvement of the product and plays the role of hardness and deformation, can be used as softener in NBR, chloroprene rubber, EPDM rubber and other products three. Especially for cable material, it has good plasticizing effect and low volatility. It is widely used in various products that require heat resistance and high insulation. It is an ideal plasticizer for producing 70 PVC cable material and other volatile resistant products.
2.DOTP is used for the PVC products in the car, which can solve the fog problem of the glass window. DOTP is also used for high quality lubricants or lubricant additives furniture and interior decoration paint, and precision instruments, nitro varnish additives, paper softener, biaxially oriented polyester amide membrane film, plastic bags and other crafts, plasma storage.
3. because the linear molecular structure of DOTP is similar to DOS and DOA, its cold resistance is also better.
The volume resistivity of 4.DOTP is 10-20 times higher than that of DOP, and its mobility is excellent.
5., because DOTP does not contain o-phthalate two formate, it is not an environmental friendly plasticizer in the range of 16 16 kinds of plasticizers containing o-phthalic acid in the European Union and other countries.
Recent studies show that the adjacent benzene two formic acid ester plasticizer from plasticized PVC medical devices and blood storage bag in migration to storage in liquid has been stored in PVC bag in serum, plasma, liquid, fat in food as well as blood dialysis and infusion with the store patient. Detection of potentially harmful plasticizer composition on human health; in addition, the soft PVC during use, if water or organic solvents and other substances, adjacent benzene two formic acid ester plasticizer can be continuously from PVC plastic transfer into the environment, pollute the environment, and with the food chain and enrichment transfer, resulting in great harm to the biological.
The loss form of plasticizer. In addition, the relative molecular weight of polyester plasticizers, plasticizers are organic small molecules, to add to the PVC, and no PVC aggregated into the polymer chain, but by the Fan Dehua force and hydrogen bond or PVC molecules combined with each other to retain independent chemical properties.
When the soft PVC is exposed to the fixed medium (gas, liquid and solid) for a long time, the plasticizer will be analyzed from PVC and into the medium. According to the different medium of contact, the loss form of plasticizer can be divided into volatilization loss, extraction loss and transfer loss.
The process of plasticizer evaporation, extraction, transfer loss includes 3 basic stages: (1) [2] plasticizer inward surface diffusion; (2) the inner surface into "lying" state; (3) diffuse away from the surface.
The loss of plasticizer is related to its molecular structure, relative molecular weight, compatibility with polymer, medium, environment and so on. The volatilization of plasticizer is mainly determined by its relative molecular weight and ambient temperature. The extraction is mainly determined by the solubility of plasticizer in the medium, and migration is closely related to the compatibility between plasticizer and PVC. The diffusion of plasticizers in PVC can be carried out in the medium that will not infiltrate into the polymer or in the medium infiltrating the polymer. The different changes and reactions on the surface of the polymer will affect the diffusion of the plasticizer. The diffusion of plasticizers is a complex process, which is related to the interaction of medium, PVC polymer and plasticizer.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
This paper introduces polyvinyl chloride (PVC) plasticizer migration and extraction of the harmfulness and the basic principle, focuses on the effects of polyvinyl chloride (PVC) by the main factors, plasticizer migration and extraction such as plasticizer molecular weight and molecular structure, environment temperature, plasticizer content, media and time.
Various solutions and research results that can effectively inhibit the extraction and migration of polyvinyl chloride (PVC) plasticizers, mainly include adding polyester plasticizers, adding nanoparticles, using ionic liquids, surface modification, surface crosslinking, surface spraying protective coatings, etc.
Soft polyvinyl chloride (PVC) products contain certain plasticizer components. These plasticizers will migrate, extract and volatilize at different degrees in the two processing and using processes.
Plasticizer loss will not only cause the deterioration of PVC products performance, but also cause contamination of the products surface and contacts. More serious is that it will bring a series of problems to the environment and human health. Therefore, the migration and extraction of plasticizers has become a major obstacle to the wide application of soft PVC products.
The adverse consequences of the migration and extraction of plasticizers. When plasticizer migrates and draws seriously in PVC, it will cause great changes in products, causing products to soften, stick, or even break. The precipitates often cause product contamination, and also affect the two processing of products.
For example, the migration of plasticizer molecules in PVC waterproofing membrane and the shrinkage and hardening of PVC after losing plasticizer can lead to failure of waterproof function.
When soft PVC products are pasted with general solvent adhesives, plasticizers in the products often migrate to the adhesive layer, causing the sharp drop of bond strength, resulting in problems such as lack of bond or degumming. When the soft PVC products are painted or painted, they are also faced with the problem of the coating or coating loss caused by the extracted plasticizer.
PVC printing, plasticizer is out of ink and printing manufacturing taboo. Some components such as pigment particles, flavors, antistatic agents, stabilizers and so on will also be brought out in the process of plasticizer precipitation in PVC. Due to the loss of these components, the physical properties of PVC products will decline, and some properties will even be lost.
These precipitates will also pollute and destroy the substances that are closely related to them. If the soft PVC and polystyrene products are put together, the plasticizer migrated by PVC will affect the performance of polystyrene products and cause the softening of polystyrene products.
Physical and chemical properties of two octyl terephthalate (plasticizer DOTP)
Appearance: transparent and colorless liquid
Boiling point: 400 degrees centigrade
Density: 0.984
Melting point: 30-34 degrees centigrade
Flash point: 238 degrees centigrade
Refractive index: 1.489-1.491
Flash point centigrade 210
Water is less than or equal to 0.03
Acid value is less than 0.1 mgKOH/g
The refractive index is greater than or equal to 1.4900 (20 C)
Color = (platinum cobalt) 30
The ester content% (chromatography) more than 99.5
Density (20 C) g/cm3 0.981-0.985
Use of two octyl terephthalate (plasticizer DOTP)
1.DOTP has good electrical and thermal properties. It can be used to replace DOP in the sheath of PVC plastic wire and can also be used in the production of artificial leather membrane. In addition, with excellent compatibility, terephthalic acid ester is two PVC acrylonitrile derivatives plastic plasticizer, plasticizer, plasticizer, polyvinyl butyral nitrile rubber plasticizer, plasticizer for cellulose nitrate. The improvement of the product and plays the role of hardness and deformation, can be used as softener in NBR, chloroprene rubber, EPDM rubber and other products three. Especially for cable material, it has good plasticizing effect and low volatility. It is widely used in various products that require heat resistance and high insulation. It is an ideal plasticizer for producing 70 PVC cable material and other volatile resistant products.
2.DOTP is used for the PVC products in the car, which can solve the fog problem of the glass window. DOTP is also used for high quality lubricants or lubricant additives furniture and interior decoration paint, and precision instruments, nitro varnish additives, paper softener, biaxially oriented polyester amide membrane film, plastic bags and other crafts, plasma storage.
3. because the linear molecular structure of DOTP is similar to DOS and DOA, its cold resistance is also better.
The volume resistivity of 4.DOTP is 10-20 times higher than that of DOP, and its mobility is excellent.
5., because DOTP does not contain o-phthalate two formate, it is not an environmental friendly plasticizer in the range of 16 16 kinds of plasticizers containing o-phthalic acid in the European Union and other countries.
Recent studies show that the adjacent benzene two formic acid ester plasticizer from plasticized PVC medical devices and blood storage bag in migration to storage in liquid has been stored in PVC bag in serum, plasma, liquid, fat in food as well as blood dialysis and infusion with the store patient. Detection of potentially harmful plasticizer composition on human health; in addition, the soft PVC during use, if water or organic solvents and other substances, adjacent benzene two formic acid ester plasticizer can be continuously from PVC plastic transfer into the environment, pollute the environment, and with the food chain and enrichment transfer, resulting in great harm to the biological.
The loss form of plasticizer. In addition, the relative molecular weight of polyester plasticizers, plasticizers are organic small molecules, to add to the PVC, and no PVC aggregated into the polymer chain, but by the Fan Dehua force and hydrogen bond or PVC molecules combined with each other to retain independent chemical properties.
When the soft PVC is exposed to the fixed medium (gas, liquid and solid) for a long time, the plasticizer will be analyzed from PVC and into the medium. According to the different medium of contact, the loss form of plasticizer can be divided into volatilization loss, extraction loss and transfer loss.
The process of plasticizer evaporation, extraction, transfer loss includes 3 basic stages: (1) [2] plasticizer inward surface diffusion; (2) the inner surface into "lying" state; (3) diffuse away from the surface.
The loss of plasticizer is related to its molecular structure, relative molecular weight, compatibility with polymer, medium, environment and so on. The volatilization of plasticizer is mainly determined by its relative molecular weight and ambient temperature. The extraction is mainly determined by the solubility of plasticizer in the medium, and migration is closely related to the compatibility between plasticizer and PVC. The diffusion of plasticizers in PVC can be carried out in the medium that will not infiltrate into the polymer or in the medium infiltrating the polymer. The different changes and reactions on the surface of the polymer will affect the diffusion of the plasticizer. The diffusion of plasticizers is a complex process, which is related to the interaction of medium, PVC polymer and plasticizer.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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