News Details
Improving the extraction and migration of plasticizers
2017-12-25 10:56:49
Improving the extraction and migration of plasticizers
Plasticizer migration and extraction is one of the important problems in the application of soft PVC products, if not a good solution, not only affects the performance and effect of soft PVC products, but also to bring certain harm to human survival environment and human health, improve the plasticizer extraction and migration method is more and more concern and attention. After many studies, some achievements have been made in improving the extraction and migration of plasticizers.
One of the ways to improve the extraction and migration of plasticizers is to add polyester plasticizers. Polyester plasticizer is a polar polymer, and has good compatibility with PVC. It is often used with DOP and epoxy soybean oil.
Polyester plasticizer has good affinity with DOP and other small molecular plasticizers. When PVC plasticizer has a certain amount of polyester plasticizer, it can play the role of attracting and fixing other plasticizers not to diffuse on the surface of PVC products, so as to reduce and prevent plasticizer migration and extraction.
Adding nanoparticles. Li Shucai and other studies show that the addition of nanoparticles can reduce the transfer loss rate in the soft PVC and improve the performance and life of the soft PVC materials. The ability of different nanoparticles to inhibit the migration of plasticizers is different, and the effect of nano SiO2 is better than that of nanoscale CaCO3.
The use of ionic liquids. Ionic liquid is a kind of green solvent which has been widely used in recent years. It has been found that it can be used as a substitute for plasticizers. Scott et al's research shows that ionic liquids can control the glass transition temperature (TG) of polymers in a large temperature range. The elastic modulus of the materials is equivalent to that of plasticizer when DOP is used.
Because the ionic liquid has low volatilization at high temperature, its leachability is low, and the UV stability is good, it is an ideal substitute for plasticizer. Surface spraying protective coating. A non - migration material is coated on the surface of the polymer to reduce the leaching and migration of the plasticizer. The disadvantage of this method is that it may cause the decrease of material flexibility.
F.Breme and other plasma assisted chemical vapor deposition (PACVD) technology was used to finish the coating of many kinds of copolymers at low temperature, and did not cause damage to the substrates. The experiments show that the coating technology can effectively prevent the leaching of plasticizers, and has a wide application prospect in the field of medical PVC.
The basic information of two octyl terephthalate (plasticizer DOTP)
Chinese Name: two octyl terephthalate
Synonyms: two Chinese terephthalate (2- ethylhexyl) ester; dioctyl terephthalate two; terephthalic acid two 1,4- benzene carboxylic acid isooctyl ester; two bis (2- ethylhexyl) ester; terephthalic acid two (2- ethylhexyl) ester; dioctyl terephthalate (DOTP); two double 2= ethylhexyl terephthalate; bis (2- ethylhexyl) terephthalic acid, plasticizer DOTP
English Name: Dioctyl terephthalate
English synonyms are: Di- (2-Ethylhexyl) Terephthalate; Di (2Ethylhexyl) Terephthalate; Kodaflexdotp; Terephthalicacid, Bis (2-Ethylhexyl) Ester; Bis;; ";"
CAS: 6422-86-2
Molecular formula: C24H38O4
Molecular weight: 390.56
EINECS: 229-176
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.
Surface crosslinking. A.Jayakrishnan and S.Lakshmi reported a method of using two thiocarbamate for light crosslinking to prevent the migration of plasticizers. In the presence of proper phase transfer catalyst, sodium sulfide can be used to modify the surface of plasticizer. Under the action of light, a net structure can be formed on the surface of PVC products, which can effectively prevent migration of plasticizers. The soft PVC processed by this method is very suitable for application in medical and related equipment.
Audic et al. Studied the surface crosslinking of PVC based flexible membrane induced by plasma to reduce the leaching and migration of plasticizer adipic acid two ethylhexyl ester (DEHA) and epoxidized soybean oil (ESO). The total migration of various plasma treated PVC packaging films was investigated. The results showed that the effect of Ar (argon) plasma treatment was the most ideal.
If a certain amount of elastic polymer EE is used instead of the plasticizer DEHA to be crosslinked, the migration of the plasticizer can be almost completely suppressed.
The leaching of the surface modified internal plasticizer in the solution can be controlled by regulating the properties of the polymer surface. In many modification technology, the surface grafting of water soluble polymer is one of the main direction of the.
Lakshmi and other methods used to graft PEG on the surface of soft PVC to enhance the hydrophilicity of the substrate surface, so as to inhibit the leaching of plasticizers. In addition, the use of phase transfer catalyst and thiosulfate anion instead of chlorine atoms in PVC can also enhance the surface hydrophilicity and prevent plasticizers from leaching and transferring in different solvents such as hexane.
Using BP as initiator, St induced by UV irradiation and AN PF-g-SAN graft copolymer graft polymerization on the surface of pulp fibers, and obtain better graft efficiency, the optimal reaction conditions for St/AN mass ratio of 2: 1, BP concentration 2%, reaction time 20min, reaction temperature is 40 DEG C.
The plasticizer is PVC plastic (soft) l product filled with a large amount of investment, the largest amount of additives. It can not only significantly improve the processing performance and the use of plastic, and choose appropriate. Can reduce costs, save energy, improve production efficiency and ensure product quality. At present, two or even two kinds of plasticizers are mixed. The main reason is the balanced comprehensive performance. A single plasticizer is impossible to achieve. The use of mixed plasticizer can improve the electrical properties of the mixture, such as fur feeling and solvent resistance.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
Plasticizer migration and extraction is one of the important problems in the application of soft PVC products, if not a good solution, not only affects the performance and effect of soft PVC products, but also to bring certain harm to human survival environment and human health, improve the plasticizer extraction and migration method is more and more concern and attention. After many studies, some achievements have been made in improving the extraction and migration of plasticizers.
One of the ways to improve the extraction and migration of plasticizers is to add polyester plasticizers. Polyester plasticizer is a polar polymer, and has good compatibility with PVC. It is often used with DOP and epoxy soybean oil.
Polyester plasticizer has good affinity with DOP and other small molecular plasticizers. When PVC plasticizer has a certain amount of polyester plasticizer, it can play the role of attracting and fixing other plasticizers not to diffuse on the surface of PVC products, so as to reduce and prevent plasticizer migration and extraction.
Adding nanoparticles. Li Shucai and other studies show that the addition of nanoparticles can reduce the transfer loss rate in the soft PVC and improve the performance and life of the soft PVC materials. The ability of different nanoparticles to inhibit the migration of plasticizers is different, and the effect of nano SiO2 is better than that of nanoscale CaCO3.
The use of ionic liquids. Ionic liquid is a kind of green solvent which has been widely used in recent years. It has been found that it can be used as a substitute for plasticizers. Scott et al's research shows that ionic liquids can control the glass transition temperature (TG) of polymers in a large temperature range. The elastic modulus of the materials is equivalent to that of plasticizer when DOP is used.
Because the ionic liquid has low volatilization at high temperature, its leachability is low, and the UV stability is good, it is an ideal substitute for plasticizer. Surface spraying protective coating. A non - migration material is coated on the surface of the polymer to reduce the leaching and migration of the plasticizer. The disadvantage of this method is that it may cause the decrease of material flexibility.
F.Breme and other plasma assisted chemical vapor deposition (PACVD) technology was used to finish the coating of many kinds of copolymers at low temperature, and did not cause damage to the substrates. The experiments show that the coating technology can effectively prevent the leaching of plasticizers, and has a wide application prospect in the field of medical PVC.
The basic information of two octyl terephthalate (plasticizer DOTP)
Chinese Name: two octyl terephthalate
Synonyms: two Chinese terephthalate (2- ethylhexyl) ester; dioctyl terephthalate two; terephthalic acid two 1,4- benzene carboxylic acid isooctyl ester; two bis (2- ethylhexyl) ester; terephthalic acid two (2- ethylhexyl) ester; dioctyl terephthalate (DOTP); two double 2= ethylhexyl terephthalate; bis (2- ethylhexyl) terephthalic acid, plasticizer DOTP
English Name: Dioctyl terephthalate
English synonyms are: Di- (2-Ethylhexyl) Terephthalate; Di (2Ethylhexyl) Terephthalate; Kodaflexdotp; Terephthalicacid, Bis (2-Ethylhexyl) Ester; Bis;; ";"
CAS: 6422-86-2
Molecular formula: C24H38O4
Molecular weight: 390.56
EINECS: 229-176
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.
Surface crosslinking. A.Jayakrishnan and S.Lakshmi reported a method of using two thiocarbamate for light crosslinking to prevent the migration of plasticizers. In the presence of proper phase transfer catalyst, sodium sulfide can be used to modify the surface of plasticizer. Under the action of light, a net structure can be formed on the surface of PVC products, which can effectively prevent migration of plasticizers. The soft PVC processed by this method is very suitable for application in medical and related equipment.
Audic et al. Studied the surface crosslinking of PVC based flexible membrane induced by plasma to reduce the leaching and migration of plasticizer adipic acid two ethylhexyl ester (DEHA) and epoxidized soybean oil (ESO). The total migration of various plasma treated PVC packaging films was investigated. The results showed that the effect of Ar (argon) plasma treatment was the most ideal.
If a certain amount of elastic polymer EE is used instead of the plasticizer DEHA to be crosslinked, the migration of the plasticizer can be almost completely suppressed.
The leaching of the surface modified internal plasticizer in the solution can be controlled by regulating the properties of the polymer surface. In many modification technology, the surface grafting of water soluble polymer is one of the main direction of the.
Lakshmi and other methods used to graft PEG on the surface of soft PVC to enhance the hydrophilicity of the substrate surface, so as to inhibit the leaching of plasticizers. In addition, the use of phase transfer catalyst and thiosulfate anion instead of chlorine atoms in PVC can also enhance the surface hydrophilicity and prevent plasticizers from leaching and transferring in different solvents such as hexane.
Using BP as initiator, St induced by UV irradiation and AN PF-g-SAN graft copolymer graft polymerization on the surface of pulp fibers, and obtain better graft efficiency, the optimal reaction conditions for St/AN mass ratio of 2: 1, BP concentration 2%, reaction time 20min, reaction temperature is 40 DEG C.
The plasticizer is PVC plastic (soft) l product filled with a large amount of investment, the largest amount of additives. It can not only significantly improve the processing performance and the use of plastic, and choose appropriate. Can reduce costs, save energy, improve production efficiency and ensure product quality. At present, two or even two kinds of plasticizers are mixed. The main reason is the balanced comprehensive performance. A single plasticizer is impossible to achieve. The use of mixed plasticizer can improve the electrical properties of the mixture, such as fur feeling and solvent resistance.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
Spanish
French
Italian
Portuguese
Japanese
Korean
Arabic
Russian