News Details
Plastic polymer antioxidants
2018-1-12 11:38:54
Plastic polymer antioxidants
Plastic polymers commonly is polar polymer, and plastic polymer antioxidant molecules with different degrees of polarity, the intermiscibility is poorer, usually under the high temperature plastic polymer antioxidants and polymer melt, the antioxidant molecules when polymer curing capacity between the polymer molecules.
Within the scope of the dosage of formula, plastic antioxidants in polymer processing temperature to melt, it is important to pay special attention to, the design formula, choose the melting point of solid antioxidant or melting range limit, should not be lower than the plastic polymer processing temperature.
Billingham and Calvert have shown that polymer crystal area spherulite interface of amorphous phase, is the most susceptible to oxidation in the polymer matrix, solubility good antioxidant was focused on the area of polymer needs it most.
Polyformaldehyde oxidation and thermal oxidation, in addition to generate free radicals, also at the same time removing formaldehyde, formaldehyde is further oxidized to formate, make a significant reduction in the mechanical properties of the products, the general use of hindered phenol antioxidant and stabilizer of heat-resistant oxygen stable system together.
The synergism includes two kinds of substances, one is the high molecular nitrogen compound, such as melamine, copolymer, etc., the main function is to prevent formaldehyde removal. The other type is organic acid salts, such as calcium stearate, calcium citrate, etc. in the system as the acid acceptor. Polyoxymethylene is extremely sensitive to ultraviolet light, the products that do not have light stability protection, expose very short time in the sunlight, the surface becomes coarse. In general, the UV - P or blocking amine 622, 292 (1, 2, 2, 2, 6, 6-5 methyl-4-poperidol) ester of benzene and triazole UV absorbents were used for UV protection of polyformaldehyde. Black carbon is an excellent ultraviolet screening agent for POM when color is allowed.
Institute of sichuan university high polymer with phenolic antioxidants, light stabilizer of ultraviolet absorption and of the homemade high polymer modifier, resistance to modified polyformaldehyde hou processing, after 1000 hours hot oxygen aging and ultraviolet aging, not modified polyformaldehyde with the mechanical properties of modified polyformaldehyde data description: hot oxygen aging performance of modified polyformaldehyde, ultraviolet aging resistance are better than that of the unmodified polyformaldehyde. The color difference of modified polyformaldehyde is better than that of unmodified polyformaldehyde.
Polymer modifier on the particularity of polyformaldehyde molecular structure stability and antioxidant and light stabilizer to coordinate the general stability of pom, endowed with modified polyformaldehyde excellent corrosion resistance.
Polymer materials are high molecular weight (usually up to 10 ~ 106) compounds that are repeatedly connected by covalent bonds of many identical, simple structural units. For example, polyvinyl chloride molecules are repeatedly connected by a number of molecular structural units called CH2CHCl - and thus "CH2CHCl" - also known as structural units or chain segments. A compound consisting of small molecules that form a structural unit is called monomers, and is the raw material for synthetic polymers.
Triphenyl phosphite (antioxidant, stabilizer TPPi) production process
1. Phosphorus oxychloride as the direct method (also called thermal method) phenol with pyridine and anhydrous benzene as solvent, in no more than 10 ℃ temperature, slowly add oxygen phosphorus chloride, then under reflux temperature, the reaction of 3 ~ 4 h. After cooling to room temperature, the reactants are washed by water to recycle pyridine. After centrifugal dehydration, the reagents are dehydrated with dried sodium sulfate, which is filtered to remove sodium sulfate. The first atmospheric distillation recovery of benzene, vacuum distillation, collected 243 ~ 245 ℃ (1.47 kPa) fraction, by cooling, crystallization, crushing is the finished product.
2. After phenol melting, stirring under add phosphorus trichloride under 25 ℃, Triphenyl phosphite is generated; Then heat up to 70 ℃ ventilation with chlorine gas, generated two chlorinated triphenyl phosphate; Again at 50 ℃ water hydrolysis, triphenyl phosphate. The hydrolysate with 5% soda solution for neutralization, water washing, the evaporation and vacuum distillation, collected 243 ~ 245 ℃ (1.47 kPa) fractions, cooling, crystallization, crushing, packaging is the finished product.
Triphenyl phosphite (TPPi antioxidants, stabilizer) is mainly used in PVC, polyethylene, polypropylene, polystyrene, polyester, abs resin, epoxy resin, synthetic rubber antioxidant stabilizer, used in polyvinyl chloride (PVC) products as a chelating agent.
Macromolecule material is ubiquitous and permeates all aspects of human life and plays a huge role in people's life.
People use polymer materials for a long time, natural products such as wood, leather, rubber, cotton, hemp, silk, starch and silicate are high polymer materials. Natural rubber is one of the earliest discovered natural polymer materials, nitrocellulose is first industrialization of the modified natural polymer material, completely synthetic polymer materials, first started with phenolic resin.
With the progress of science and technology and the development of economy, high strength, high toughness, high temperature resistant, resistant to extreme conditions such as high performance polymer materials development is very rapid, provides the necessary for electronics, aerospace industry and other new materials. At present, polymer materials are functional, intelligent and intensification direction, make its have the light, from the structure of materials to the electricity, sound, magnetism, biomedical, bionic separation, catalysis, material and energy conversion effect on the direction of functional materials, such as separation materials, conductive materials, intelligent materials, can storage material, can change material, nano materials, optical materials, biological activity material, the development of electronic information materials have shown that this kind of development trend.
At the same time, many advanced technologies, such as plasma technology, laser technology and radiation technology, have been introduced in the production and processing of polymer materials. The research on the relationship between structure and performance is also carried out by macro into micro (molecular level). From qualitative to semi-quantitative or quantitative; The new material that achieves the desired function is synthesized and prepared at the molecular design level by static entry dynamic.
There are many kinds of polymer materials. For example, the source can be divided into natural polymer materials and synthetic polymer materials;
The main chain structure can be divided into carbon chain polymer materials, heterochain polymer materials, inorganic polymer materials and organic polymer materials. According to the performance and use, can be divided into rubber, plastic, fiber, adhesives, paint, functional polymer materials, biological polymer materials.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
Plastic polymers commonly is polar polymer, and plastic polymer antioxidant molecules with different degrees of polarity, the intermiscibility is poorer, usually under the high temperature plastic polymer antioxidants and polymer melt, the antioxidant molecules when polymer curing capacity between the polymer molecules.
Within the scope of the dosage of formula, plastic antioxidants in polymer processing temperature to melt, it is important to pay special attention to, the design formula, choose the melting point of solid antioxidant or melting range limit, should not be lower than the plastic polymer processing temperature.
Billingham and Calvert have shown that polymer crystal area spherulite interface of amorphous phase, is the most susceptible to oxidation in the polymer matrix, solubility good antioxidant was focused on the area of polymer needs it most.
Polyformaldehyde oxidation and thermal oxidation, in addition to generate free radicals, also at the same time removing formaldehyde, formaldehyde is further oxidized to formate, make a significant reduction in the mechanical properties of the products, the general use of hindered phenol antioxidant and stabilizer of heat-resistant oxygen stable system together.
The synergism includes two kinds of substances, one is the high molecular nitrogen compound, such as melamine, copolymer, etc., the main function is to prevent formaldehyde removal. The other type is organic acid salts, such as calcium stearate, calcium citrate, etc. in the system as the acid acceptor. Polyoxymethylene is extremely sensitive to ultraviolet light, the products that do not have light stability protection, expose very short time in the sunlight, the surface becomes coarse. In general, the UV - P or blocking amine 622, 292 (1, 2, 2, 2, 6, 6-5 methyl-4-poperidol) ester of benzene and triazole UV absorbents were used for UV protection of polyformaldehyde. Black carbon is an excellent ultraviolet screening agent for POM when color is allowed.
Institute of sichuan university high polymer with phenolic antioxidants, light stabilizer of ultraviolet absorption and of the homemade high polymer modifier, resistance to modified polyformaldehyde hou processing, after 1000 hours hot oxygen aging and ultraviolet aging, not modified polyformaldehyde with the mechanical properties of modified polyformaldehyde data description: hot oxygen aging performance of modified polyformaldehyde, ultraviolet aging resistance are better than that of the unmodified polyformaldehyde. The color difference of modified polyformaldehyde is better than that of unmodified polyformaldehyde.
Polymer modifier on the particularity of polyformaldehyde molecular structure stability and antioxidant and light stabilizer to coordinate the general stability of pom, endowed with modified polyformaldehyde excellent corrosion resistance.
Polymer materials are high molecular weight (usually up to 10 ~ 106) compounds that are repeatedly connected by covalent bonds of many identical, simple structural units. For example, polyvinyl chloride molecules are repeatedly connected by a number of molecular structural units called CH2CHCl - and thus "CH2CHCl" - also known as structural units or chain segments. A compound consisting of small molecules that form a structural unit is called monomers, and is the raw material for synthetic polymers.
Triphenyl phosphite (antioxidant, stabilizer TPPi) production process
1. Phosphorus oxychloride as the direct method (also called thermal method) phenol with pyridine and anhydrous benzene as solvent, in no more than 10 ℃ temperature, slowly add oxygen phosphorus chloride, then under reflux temperature, the reaction of 3 ~ 4 h. After cooling to room temperature, the reactants are washed by water to recycle pyridine. After centrifugal dehydration, the reagents are dehydrated with dried sodium sulfate, which is filtered to remove sodium sulfate. The first atmospheric distillation recovery of benzene, vacuum distillation, collected 243 ~ 245 ℃ (1.47 kPa) fraction, by cooling, crystallization, crushing is the finished product.
2. After phenol melting, stirring under add phosphorus trichloride under 25 ℃, Triphenyl phosphite is generated; Then heat up to 70 ℃ ventilation with chlorine gas, generated two chlorinated triphenyl phosphate; Again at 50 ℃ water hydrolysis, triphenyl phosphate. The hydrolysate with 5% soda solution for neutralization, water washing, the evaporation and vacuum distillation, collected 243 ~ 245 ℃ (1.47 kPa) fractions, cooling, crystallization, crushing, packaging is the finished product.
Triphenyl phosphite (TPPi antioxidants, stabilizer) is mainly used in PVC, polyethylene, polypropylene, polystyrene, polyester, abs resin, epoxy resin, synthetic rubber antioxidant stabilizer, used in polyvinyl chloride (PVC) products as a chelating agent.
Macromolecule material is ubiquitous and permeates all aspects of human life and plays a huge role in people's life.
People use polymer materials for a long time, natural products such as wood, leather, rubber, cotton, hemp, silk, starch and silicate are high polymer materials. Natural rubber is one of the earliest discovered natural polymer materials, nitrocellulose is first industrialization of the modified natural polymer material, completely synthetic polymer materials, first started with phenolic resin.
With the progress of science and technology and the development of economy, high strength, high toughness, high temperature resistant, resistant to extreme conditions such as high performance polymer materials development is very rapid, provides the necessary for electronics, aerospace industry and other new materials. At present, polymer materials are functional, intelligent and intensification direction, make its have the light, from the structure of materials to the electricity, sound, magnetism, biomedical, bionic separation, catalysis, material and energy conversion effect on the direction of functional materials, such as separation materials, conductive materials, intelligent materials, can storage material, can change material, nano materials, optical materials, biological activity material, the development of electronic information materials have shown that this kind of development trend.
At the same time, many advanced technologies, such as plasma technology, laser technology and radiation technology, have been introduced in the production and processing of polymer materials. The research on the relationship between structure and performance is also carried out by macro into micro (molecular level). From qualitative to semi-quantitative or quantitative; The new material that achieves the desired function is synthesized and prepared at the molecular design level by static entry dynamic.
There are many kinds of polymer materials. For example, the source can be divided into natural polymer materials and synthetic polymer materials;
The main chain structure can be divided into carbon chain polymer materials, heterochain polymer materials, inorganic polymer materials and organic polymer materials. According to the performance and use, can be divided into rubber, plastic, fiber, adhesives, paint, functional polymer materials, biological polymer materials.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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