News Details
Thermoplastic polyvinyl chloride plasticizer
2017-12-16 17:21:24
Thermoplastic polyvinyl chloride plasticizer is a kind of high boiling point, low volatile substance, its molecular structure has a polar part and non polar part. Thermoplastic polyvinyl chloride plasticizer molecules can be inserted between polymer chains, weakening intermolecular force, increasing the distance between polymer chains and activity space, increasing polymer plasticity and reducing polymer processing temperature.
The plasticization of PVC is taken as an example. Because of the polarity of the chlorine atoms on the polyvinyl chloride molecular chain, the intermolecular force is strong, the processing temperature is high, and it is easy to degrade. Adding thermoplastic PVC plasticizer and heating in PVC, plasticizer can be inserted between the molecular chains of PVC, plasticizer and PVC polar polar part part, after cooling, the plasticizer molecules remain in the insertion position, and the plasticizer non-polar part to play the role of separation, weaken the force of PVC molecules, improve PVC plastic and flexibility, reduce the temperature of the PVC processing.
The polar parts of plasticizers are mainly ester group, epoxy group, ether bond, cyanide group, chlorine group and other polar groups. The non-polar part is mainly methylene chain and alkyl chain.
Plasticizers added to polymers are called external plasticizers. Monomers added to polymer formation are called internal plasticizers, such as vinyl chloride and vinyl acetate, vinyl acetate as internal plasticizer. Effect of plasticizers: reduce the melt viscosity; increase the flexibility of the polymer; increase the elongation of polymer; lower the processing temperature of polymer; the improved processability of polymers; to improve the impact properties of polymers; low temperature curves and improve the polymer; the lower surface hardness of polymers.
The formulation of PVC plastic profile is mainly made up of PVC resin and auxiliaries. Auxiliaries are divided into heat stabilizer, lubricating agent, processing modifier, impact modifier, filler, aging resistant agent, coloring agent and so on. Before designing the PVC formula, first of all, we should understand the properties of the PVC resin and the various additives.
1, the resin should choose PVC-SC5 resin or PVC-SG4 resin, that is, polyvinyl chloride resin with a degree of polymerization of 1200-1000.
2, the thermal stability system must be added. According to the actual production requirements, we should pay attention to the synergistic effect and the antagonism effect between the heat stabilizers.
3, the impact modifier must be added. CPE and ACR impact modifiers can be selected. According to the other components in the formula and the plasticizing capacity of the extruder, the amount of addition is 8 to 12 copies. The price of CPE is low, the source is wide, and the aging resistance of ACR and the strength of welding angle are high.
4, proper addition of the lubrication system. The lubrication system can reduce the machine load and make the product smooth, but the overdose will decrease the strength of the welding angle.
Two octyl terephthalate (plasticizer DOTP) information:
Shipping port: Shanghai port
Price quotation validity: 15 days
Entry time: 15 days (inspection declaration)
Export authority: the company's right to import and export
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.
5. Adding processing modifier can improve the quality of plasticizing and improve the appearance of the products. In general, ACR processing modifier is added and 1-2 copies are added.
6, adding filler can reduce the cost and increase the rigidity of profiles, but has a great impact on the impact strength at low temperature. We should choose the active light calcium carbonate with high fineness and add 5-15.
7, a certain amount of titanium dioxide must be added to shield the ultraviolet light. The titanium white should be selected as the rutile type and added in 4-6 copies. When necessary, the ultraviolet absorbent UV-531 and UV327 can be added to increase the aging resistance of the profile.
8. A proper addition of blue and fluorescent brighteners can improve the color and luster of the profile.
9, in the design formulation, we should try to simplify it, try not to add liquid additives, and according to the requirements of the mixing process (see mixed problem), the batch can be divided into I number, No. 2 and No. 3 materials separately according to the order of feeding.
The suspension polymerization is carried out by continuous stirring to keep the droplets of the single body suspended in the water, and the polymerization is carried out in the small droplets of the monomer. The suspension polymerization is usually a batch polymerization.
In recent years, the formulation, polymerization kettle, product variety and quality of PVC resin suspension polymerization process have been continuously studied and improved, and various characteristics of the process technology have been developed.
Emulsion polymerization is basically similar to suspension polymerization, only using a larger number of emulsifiers, and not in water but in monomers. The polymerization system can effectively prevent the aggregation of polymer particles and obtain polymer resin with small particle size. The particle size of PVC resin produced by the general emulsion method is 0.1 - 0.2mm, and the suspension method is 20 - 200mm. The initiator system is also different from the suspension polymerization, which is usually an oxidation-reduction system containing persulfate.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
The plasticization of PVC is taken as an example. Because of the polarity of the chlorine atoms on the polyvinyl chloride molecular chain, the intermolecular force is strong, the processing temperature is high, and it is easy to degrade. Adding thermoplastic PVC plasticizer and heating in PVC, plasticizer can be inserted between the molecular chains of PVC, plasticizer and PVC polar polar part part, after cooling, the plasticizer molecules remain in the insertion position, and the plasticizer non-polar part to play the role of separation, weaken the force of PVC molecules, improve PVC plastic and flexibility, reduce the temperature of the PVC processing.
The polar parts of plasticizers are mainly ester group, epoxy group, ether bond, cyanide group, chlorine group and other polar groups. The non-polar part is mainly methylene chain and alkyl chain.
Plasticizers added to polymers are called external plasticizers. Monomers added to polymer formation are called internal plasticizers, such as vinyl chloride and vinyl acetate, vinyl acetate as internal plasticizer. Effect of plasticizers: reduce the melt viscosity; increase the flexibility of the polymer; increase the elongation of polymer; lower the processing temperature of polymer; the improved processability of polymers; to improve the impact properties of polymers; low temperature curves and improve the polymer; the lower surface hardness of polymers.
The formulation of PVC plastic profile is mainly made up of PVC resin and auxiliaries. Auxiliaries are divided into heat stabilizer, lubricating agent, processing modifier, impact modifier, filler, aging resistant agent, coloring agent and so on. Before designing the PVC formula, first of all, we should understand the properties of the PVC resin and the various additives.
1, the resin should choose PVC-SC5 resin or PVC-SG4 resin, that is, polyvinyl chloride resin with a degree of polymerization of 1200-1000.
2, the thermal stability system must be added. According to the actual production requirements, we should pay attention to the synergistic effect and the antagonism effect between the heat stabilizers.
3, the impact modifier must be added. CPE and ACR impact modifiers can be selected. According to the other components in the formula and the plasticizing capacity of the extruder, the amount of addition is 8 to 12 copies. The price of CPE is low, the source is wide, and the aging resistance of ACR and the strength of welding angle are high.
4, proper addition of the lubrication system. The lubrication system can reduce the machine load and make the product smooth, but the overdose will decrease the strength of the welding angle.
Two octyl terephthalate (plasticizer DOTP) information:
Shipping port: Shanghai port
Price quotation validity: 15 days
Entry time: 15 days (inspection declaration)
Export authority: the company's right to import and export
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.
5. Adding processing modifier can improve the quality of plasticizing and improve the appearance of the products. In general, ACR processing modifier is added and 1-2 copies are added.
6, adding filler can reduce the cost and increase the rigidity of profiles, but has a great impact on the impact strength at low temperature. We should choose the active light calcium carbonate with high fineness and add 5-15.
7, a certain amount of titanium dioxide must be added to shield the ultraviolet light. The titanium white should be selected as the rutile type and added in 4-6 copies. When necessary, the ultraviolet absorbent UV-531 and UV327 can be added to increase the aging resistance of the profile.
8. A proper addition of blue and fluorescent brighteners can improve the color and luster of the profile.
9, in the design formulation, we should try to simplify it, try not to add liquid additives, and according to the requirements of the mixing process (see mixed problem), the batch can be divided into I number, No. 2 and No. 3 materials separately according to the order of feeding.
The suspension polymerization is carried out by continuous stirring to keep the droplets of the single body suspended in the water, and the polymerization is carried out in the small droplets of the monomer. The suspension polymerization is usually a batch polymerization.
In recent years, the formulation, polymerization kettle, product variety and quality of PVC resin suspension polymerization process have been continuously studied and improved, and various characteristics of the process technology have been developed.
Emulsion polymerization is basically similar to suspension polymerization, only using a larger number of emulsifiers, and not in water but in monomers. The polymerization system can effectively prevent the aggregation of polymer particles and obtain polymer resin with small particle size. The particle size of PVC resin produced by the general emulsion method is 0.1 - 0.2mm, and the suspension method is 20 - 200mm. The initiator system is also different from the suspension polymerization, which is usually an oxidation-reduction system containing persulfate.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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