PP
Polypropylene
CAS: 9003-07-0
Molecular Formula: C22H42O3
PP - Names and Identifiers
PP - Physico-chemical Properties
| Molecular Formula | C22H42O3 |
| Molar Mass | 354.56708 |
| Density | 0.9 g/mL at 25 °C (lit.) |
| Melting Point | 157 °C |
| Boling Point | 120-132 °C |
| Appearance | particles (Spherical) |
| Merck | 13,7663 |
| Storage Condition | -20°C |
| Refractive Index | n20/D 1.49(lit.) |
| MDL | MFCD00084447 |
| Physical and Chemical Properties | non-toxic, tasteless, small degree, strength and stiffness, hardness and heat resistance are better than low-pressure polyethylene, can be used at about 100 degrees. It has good electrical properties and high-frequency insulation is not affected by humidity, but low temperature time-varying brittleness, not wear-resistant, easy to aging. Suitable for making general mechanical parts, corrosion-resistant parts and insulating parts. Common acid and alkali organic solvents have little effect on it, and can be used in food. |
| Use | For the production of extrusion film, composite film plastic products |
PP - Risk and Safety
| WGK Germany | 3 |
| RTECS | UD1842000 |
| TSCA | Yes |
| HS Code | 39021000 |
| Toxicity | LD50 intraperitoneal in rat: > 110gm/kg |
PP - Reference
| Reference Show more | 1. Yang, Jun-Hui, et al. "Effect of piperine on the bioavailability and pharmacokinetics of rosmarinic acid in rat plasma using UPLC-MS/MS." Xenobiotica 48.2 (2018): 178-185.https://doi.org/10.1080/00498254.2017.1292564 |
PP - Nature
Open Data Verified Data
isotactic polypropylene is a highly crystalline (up to 95% crystallinity) thermoplastic resin with regular configuration. Products for the color of the granules, non-toxic, tasteless, odorless and light polymer, density 0. 90~0.91g/Cm3, is one of the most common plastic light. Rigidity, good wear resistance, high hardness, good high temperature impact (but below -5 deg C is a sharp decline). Strong resistance to repeated folding. Good heat resistance, heat distortion temperature 114 ℃, Vicat Softening Point> 140 ℃, melting point of 164~167 ℃, continuous use temperature of up to 110~120 ℃, in the case of no load, the use of temperature up to 150 deg C, is the only general plastic can be boiled in water, and can be 130 deg C Disinfection products. Chemical stability is good, in addition to strong oxidation medium, and most chemicals do not occur. The stability of water is particularly prominent, not only insoluble in water, but also almost no water absorption, 24H water absorption rate is only 0. 01%. Excellent electrical insulation, voltage and arc resistance. Its main disadvantage is poor light resistance, easy aging; Cold resistance is poor, low temperature impact strength is poor, toughness is not good, high static electricity, poor dyeing, printing and adhesion, but can be used to add additives, the method of co-mixing copolymerization was improved.
Last Update：2024-01-02 23:10:35
PP - Preparation Method
Open Data Verified Data
The industrial production methods of polypropylene include solvent method (also known as slurry method), solution method, gas phase bulk method and liquid phase bulk method. Solvent method is the main method in China.
- The solvent method (also called slurry method) brings the purity to 99. 5% or more of high purity propylene (sometimes a certain amount of comonomer can be added as needed), in the alkane solvent (hexane, heptane or gasoline, etc.), hydrogen is used as the molecular weight regulator, with titanium trichloride, alkyl aluminum and other three components of high efficiency catalyst, in 50~80 ℃ (mostly 60~70 ℃) and 0. Under the condition of 78~0.98MPA, polypropylene slurry was prepared by continuous polymerization in a multi-pot series polymerization reactor. Then, the polypropylene slurry suspension is continuously sent to the flash device, and the unreacted propylene and part of the solvent are separated, centrifuged, dried, and granulated with a stabilizer to obtain a milky white translucent granular product. The random polypropylene dissolved in the solvent is recovered simultaneously in the solvent recovery process.
- solution process propylene is polymerized in an inert solvent in the presence of metallic lithium, lithium aluminum hydride and titanium tetrachloride catalyst. The polymerization temperature was 160-175 ℃, and the polymerization pressure was 2. 74-8.11 MPa. The polymer-containing solution is flash evaporated, concentrated to remove dissolved propylene and part of the solvent, and then filtered while heating to remove the catalyst residue. The filtrate is cooled to precipitate an isotactic polymer, centrifuged to obtain a solid polymer, and then extracted, centrifuged, washed and dried to obtain a polymer product.
- gas phase bulk process feedstock propylene in the gaseous state in a stirred bed or fluidized bed reactor at 70-75 °c and 2. 45~2. Under the condition of 94MPa, the product was prepared by the polymerization of high efficiency aluminum titanium catalyst. The polymer is present as solid particles without the need for solvent, catalyst residues and random substances.
- liquid phase bulk method propylene is polymerized in a liquid state in the presence of a catalyst (as in the solvent method). When a high-efficiency catalyst is used, a polypropylene product is obtained as long as unreacted monomers are removed by flash evaporation. If a conventional catalyst is used, the polymer is subjected to solvent extraction and alcohol washing, water washing, drying and other treatment steps to remove random substances and catalyst residues.
- synthesis of metallocene isotactic polypropylene metallocene isotactic polypropylene refers to isotactic polypropylene produced with a metallocene catalyst, A metallocene catalyst generally refers to a catalytic system consisting of a metallocene compound as a main catalyst and a Lewis acid as a co-catalyst. Metallocene catalysts have the following characteristics in comparison with conventional Ziegler Natta catalysts. (1) the metallocene catalyst, especially the zirconium metallocene catalyst, has extremely high catalyst activity, and the homogeneous metallocene catalyst containing 1G zirconium can catalyze the polymerization of lOOt ethylene. With such high activity, the catalyst can be allowed to remain in the polyolefin product. This catalyst allows extremely fast insertion times of olefins, with an insertion time of about 10 -5 s per olefin molecule during chain growth, which is comparable to the reaction catalyzed by biological enzymes. The metallocene catalyst belongs to the catalyst with a single active center, and the polymerization product has good uniformity, which is mainly manifested in the relatively narrow molecular weight distribution and the uniform distribution of the comonomer in the main chain of the polymer. ③ metallocene catalysts have excellent catalytic copolymerization ability, which can almost polymerize most comonomers with ethylene, and many new polyolefin materials can be obtained. In isotactic polypropylene, Eisen et al. used chiral diamine compounds with C3 symmetry to react with ZrCl4 and TiCl4 respectively to form chiral complexes, in the catalytic polymerization process, the complex is promoted by MAO to produce polypropylene with isotactic structure, wherein the isotactic degree of polypropylene obtained from Zirconium Catalyst is as high as 98.9% and the melting point is 140~154 °c. In order to improve the processing performance of metallocene/PP, 2 or 3 metallocene catalysts were mixed together to produce metallocene/PP, metallocene/PP with a broad or bimodal molecular weight distribution was obtained.
Last Update：2022-01-01 11:07:31
PP - Introduction
Polypropylene is prepared by forming long chains of propylene and ethylene monomers.
Last Update：2022-10-16 17:29:47
PP - Use
Open Data Verified Data
polypropylene has excellent comprehensive properties and wide application range.
Last Update：2022-01-01 11:07:33
PP - Safety
Open Data Verified Data
resin production raw materials, the skin and mucous membranes of the human body have different degrees of stimulation, can cause skin allergic reactions and inflammation; At the same time also pay attention to the harm of resin dust on the human body, long-term inhalation of high concentrations of resin dust, can cause lung lesions. Most of the resin has a common hazard characteristics: open flame, high temperature flammable, and oxidant exposure to cause combustion risk. Therefore, the operator should improve the operating environment, the operation area and the non-operation area are consciously divided, as far as possible automation, sealing, installation of ventilation facilities and so on. Packed in plastic film-lined bags or polypropylene woven bags, each 25kg. Storage in a cool, dry, ventilated warehouse, not in the open air, not by sunlight. In the wet and hot season to be inverted once a month, easy to ventilation. When transport must use a clean tarpaulin transport, to prevent moisture. Storage and Transportation period of 1 year is appropriate. Water, sand, fire extinguishing can be used.
Last Update：2022-01-01 11:07:33
PP - Molding Process
Open Data Verified Data
polypropylene has good processing performance, and general thermoplastic resin, can be used for injection molding, extrusion, blow molding and spinning and other methods for molding processing, can also be welded, hot forming, electroplating and foaming, if necessary, secondary processing may also be performed. Containers, pipes, plates, films, flat wires, fibers, bottles and various injection molded parts can be prepared. Polypropylene has good fluidity, high softening point and low enthalpy, so the molding cycle is shorter than that of most thermoplastics, and no drying is required before processing. The molding method has a certain relationship with the melt flow rate (MFR) of different products and selected resins.
- spinning polypropylene spinning has two kinds: wet method and dry method. The melt spinning process is: melt extrusion traction cooling thermal stretching annealing. The ratio of the drawing speed to the extrusion speed is (60 to 200):1, and the spinning speed is 150 to 300m/min. PP used in textile fiber has certain requirements on molecular weight distribution and melt flow rate. The key index of spinnability is molecular weight distribution, the narrower the molecular weight distribution, the better the spinnability; PP Flat wire is usually produced by extrusion of PP as raw material, MFR in 1.5~6. Og/lo min range. Slightly larger MFR is acceptable, but should not be too small, otherwise it will cause processing difficulties. The main requirement of the raw material resin is that the molecular weight distribution is as narrow as possible, the resin does not have a high molecular weight gel component or Crystal Point, and the flat silk fabric used outdoors should be selected from the anti ultraviolet grade PP. In order to improve the flexibility, hand and slip resistance of PP, a small amount of LLDPE(MFR 0.5g/10 min, about 15%) can be added into PP resin. Or HDPE (dosage in about 6%).
- blown PP resin is a crystalline polymer, and after melting in an extruder, the crystalline structure completely disappears, and the transparency and physical and mechanical properties of the film are different due to different cooling conditions. Slow cooling, high crystallinity, poor transparency of the film; Fast cooling, low crystallinity, high transparency of the film, good physical and mechanical properties, film feel good. Therefore, pp blown film, often used in the down-blown water-cooled production process. The tube blank extruded from the die of the die was immediately subjected to cooling and setting of the cooling water jacket after inflation, and then passed through the splint and traction roller, and finally coiled. Due to the different MFR of PP, the extrusion temperature used in blow molding is also different. In general, the extrusion temperature at which the MFR is small is high, whereas the extrusion temperature is low. In the case of extrusion of a blown tube film, the processing temperature is generally 220 to 250 °c.
- extrusion extrusion molding method can be processed to produce pipe, plate, sheet, film, monofilament, profile and wire, cable coating, etc. Single-screw or twin-screw extruder can be used for extrusion molding, the aspect ratio is about 20-24, the compression ratio is 3.5-4.0, the filter plate with 100 mesh is provided in front of the Screw, and the extrusion temperature is generally 260-280 ℃. T-shaped film forming extrusion flat film multi-purpose homopolymer, the inlet end temperature of the material is 230 ℃, the die temperature is 260~280 ℃; Taking PP plastic packaging belt as an example, its production process is not complicated, the PP is put into the extruder, the material is heated and melted, and the material is extruded into a belt through the head, and then the plastic packing belt is made through the process of stretching and embossing. Appropriate color masterbatches can be added to the raw material as needed to produce different colors of the packaging tape.
- injection molding is one of the most important molding methods of PP products. Any standard plunger or screw injection molding machine can be used for injection molding of polypropylene, and the screw type is more uniform than the plunger type, and the pressure loss is small, processing temperature is low, the product quality is good. Generally injection molding melt flow rate of 2~5g/10 min resin is appropriate, but the choice of screw injection molding machine, the choice of melt flow rate of less than 0. 3-0. 8g/10 min resin. When large and thin articles are processed by injection molding, resins having a melt flow rate of up to 18g/10 min may be used. Processing conditions and the selection of molding machinery, product size, shape, mold structure and resin grade has a great relationship. Injection pressure is generally 6. 86~13, 7MPa, Mold temperature is 40~60 ℃, injection temperature is 200~300 ℃. The mold temperature should be lower for products prone to bubbles. Some special products, injection molding temperature can be as high as 315 deg C, but not more than 315 deg C. Otherwise the resin will be severely degraded. Injection molding has a short cycle, can be a complex shape, precise size of the products, high production efficiency, the molding of a variety of plastic adaptability and a series of advantages, therefore, injection molding is an economical and advanced plastic molding technology, which has developed rapidly in recent years. The process conditions for injection molding of polypropylene are as follows.
- other polypropylene products can also be finishing, bonding, printing, welding, electroplating, shearing, cutting, etching and other secondary processing.
Last Update：2022-01-01 11:07:32
PP - Reference Information
| (IARC) carcinogen classification | 3 (Vol. 19, Sup 7) 1987 |
| NIST chemical information | information provided by: webbook.nist.gov (external link) |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| high molecular weight polymer | polypropylene is a high molecular weight polymer formed by the polymerization of propylene monomer. The production process of polypropylene can be divided into five categories according to the type of polymerization: solution method, slurry method, bulk method, gas phase method and bulk method-gas phase method combination process. Polypropylene was first produced by the Italian Monte catinl company in 1957. At present, it has become the fastest growing plastic variety, and its output is second only to polyethylene and polyvinyl chloride, ranking third. according to different structures, polypropylene can be divided into three categories: isotactic, syndiotactic and random. At present, the most widely used is isotactic polypropylene, which can account for more than 90%. Random polypropylene can be used as additives, adhesives, modified materials, etc., as a carrier of modified Masterbatch, with high viscosity, good liquidity, excellent coating effect, due to the yield, price, use conditions and other reasons, at present, the random polypropylene as a modified Masterbatch carrier used by the manufacturer has been very few. Syndiotactic polypropylene is a low crystalline polymer, polymerized by metallocene catalyst, which was first developed in 1988 and belongs to high elastic thermoplastic material. Syndiotactic polypropylene has the advantages of transparency, toughness and flexibility, but the rigidity and hardness are only half of those of isotactic polypropylene. Syndiotactic polypropylene can be vulcanized like ethylene-propylene rubber, and the mechanical properties of the obtained elastomer are higher than those of ordinary rubber. Because of the high price, the current application of syndiotactic polypropylene is not wide, but it is a new growth point of polypropylene resin, and a new synthetic resin for modified materials. This information was edited by The Chemical Book. |
| Properties of polypropylene | ① mechanical properties of polypropylene compared with polyethylene, the mechanical properties such as stiffness and hardness are relatively high, and the gloss is good, but it is still low in plastic materials. Where high strength is desired, this can be achieved by selection of high crystalline polypropylene or filled, reinforced polypropylene. The impact strength of polypropylene is related to the relative molecular weight, crystallinity, crystal size and other factors, and has a great dependence on temperature. The impact strength of polypropylene is lower at low temperature. Polypropylene also has excellent Bending resistance, fatigue resistance, its products at room temperature can be bent 106 times without damage. Electrical properties polypropylene is a non-polar polymer with excellent electrical insulation properties. Its electrical properties are basically not affected by the environmental humidity and the change of electric field frequency. It is an excellent dielectric material and electrical insulating material, and can be used as a high frequency insulating material. The arc resistance of polypropylene is very good, between 130 ~ 180s, which is a high level in plastic materials. Affected by the brittleness of polypropylene at low temperature, the environmental conditions of its application in the field of insulation are far less than polyethylene and polyvinyl chloride, mainly used for the insulation of communication cables and electrical housing. The thermal properties of polypropylene has good heat resistance, can be used at more than 100 degrees Celsius, light load up to 120 degrees Celsius, no load conditions, the highest continuous use temperature of up to 120 degrees Celsius, short-term use temperature of 150 degrees Celsius. Polypropylene has good boiling water resistance and steam resistance, and is especially suitable for the preparation of medical high pressure Disinfection products. The thermal conductivity of polypropylene is about 0.15~0.24W/(m · K), which is less than that of polyethylene, and it is a good thermal insulation material. Chemical resistant polypropylene is a non-polar crystalline alkane polymer with good chemical resistance. It is insoluble in any solvent at room temperature, but swelling may occur in some solvents. Polypropylene can resist the corrosion of acids, bases, salts and most organic solvents (such as alcohols, phenols, aldehydes, ketones and most carboxylic acids) other than strong oxidants, concentrated sulfuric acid and concentrated nitric acid. At the same time, polypropylene also has a good resistance to environmental stress cracking, but aromatic hydrocarbons, chlorinated hydrocarbons will make its swelling, more significant at high temperature. Polypropylene is also soluble in tetra-naphthalene chloride, decalin and 1,2, 4-trichlorobenzene at high temperature. (5) environmental properties of polypropylene weather resistance is poor, the tertiary carbon atoms on the hydrogen is easy to be oxidized, very sensitive to UV, oxidation and UV degradation. Polypropylene without stabilizer, placed in the room for 4 months, the performance of the sharp deterioration, after 150 C, 0.5~3.0h high temperature aging or 12 days in the atmosphere exposure to the Sun brittle. Therefore, antioxidants and light stabilizers must be added to the polypropylene resin. In the presence of copper, the oxidative degradation rate of polypropylene will be accelerated by hundreds of times. At this time, it is necessary to add copper inhibitors, such as salicylethylenediamine, benzoyl hydrazine or benzotriazole. Figure 2 shows the main performance indicators of polypropylene. |
| industrial production methods | the industrial production methods of polypropylene are solvent method (also known as slurry method), bulk method and gas phase method. In China, the solvent method is the main method, which is the purity of more than 99% of propylene (sometimes according to the need to add other copolymers) in alkane solvents (such as gasoline, hexane, heptane, etc.), with titanium trichloride as catalyst, diethyl Aluminum monochloride as activator, hydrogen as molecular weight regulator, continuous polymerization at 50 ℃,1MPa. The resulting solvent-polypropylene slurry suspension is continuously fed to the flash device, and after separating the unreacted propylene and part of the solvent from the top, the esterification reaction was carried out with methanol at 80-85 °c to destroy the remaining catalyst. After neutralization, washing, separation, drying and extrusion granulation, the milky white translucent granular product is obtained. The conversion of propylene can reach 95% when liquid propylene is polymerized at 70 ℃ and 3MPa without other solvents. the gas phase law is that propylene is fed into the reactor in the gaseous state and polypropylene is produced under the catalysis of Ziegler-Natta catalyst. These two methods have been developed rapidly due to their short process flow and low energy consumption. |
| application field | polypropylene has excellent processability, and can use a variety of processing methods to produce different products for various purposes. The amount of polypropylene injection molding products is very large, and the general daily necessities are mainly ordinary polypropylene. In the automotive, household appliances, industrial parts and so on, the amount of polypropylene or modified polypropylene is more, such as automobile bumper, wheel cover with toughened polypropylene, and instrument panel, steering wheel, fan blade, reinforced polypropylene for handle etc. There are many extrusion products of polypropylene, among which the largest amount is fiber and silk, which is mainly due to the good mechanical properties, wear resistance, chemical resistance and low price of polypropylene. Polypropylene filaments and fiber products mainly include monofilaments, flat filaments and fibers. Monofilament has small density, good toughness and good wear resistance, and is suitable for the production of rope and fishing net. Flat tensile strength, suitable for the production of woven bags, can be used for packaging fertilizer, cement, grain and chemical raw materials, can also be used for the production of woven cloth, the production of propaganda and rain cloth. Fiber can be widely used in the production of carpet, carpet, clothing, artificial turf, filter cloth, non-woven fabric and curtain. Extruded articles of polypropylene may also be used to produce films. The biaxially stretched film can improve the strength and transparency of polypropylene, and can be used as a typemachine tape, a cigarette packaging film, a food bag, and the like. In addition, the polypropylene extruded article can also be used for pipe, sheet, narrow band, tear film, packing tape, etc. hollow products of polypropylene have good transparency, mechanical properties and moisture barrier properties, and can be used as packaging containers for detergents, cosmetics, pharmaceuticals, liquid fuels and chemical reagents. polypropylene is the main synthetic resin for the production of modified masterbatch. The earliest technicians of Beijing plastics industry company used atactic polypropylene (APP), a by-product of isotactic polypropylene produced by Yanshan Petrochemical Company, adding heavy calcium carbonate and related additives to produce filling modified Masterbatch, used in polypropylene products, such as flat wire, packaging tape, etc., can improve the product printing effect, reduce the shrinkage rate of products, improve economic efficiency. More importantly, it solved the way of by-product treatment in petrochemical plant, found the application field for Atactic polypropylene, and effectively improved the application value of the product. with the continuous improvement of the production process of synthetic resin, the isotacticity of polypropylene is improved, and the yield and quality of atactic polypropylene are also decreased, in particular, the application range and production of the modified Masterbatch are developing rapidly, and few manufacturers have adopted atactic polypropylene as a carrier of the masterbatch. At present, the carrier resin filled with modified Masterbatch is dominated by isotactic polypropylene, and the powdery polypropylene produced by small bulk method occupies an important position of the carrier resin. |
| Use | used in injection molding, extrusion molding, making a variety of products and a variety of fibers, narrow Band and film, etc. used in textile and weaving used in the production of air conditioning outdoor unit shell, beer box, long-term outdoor use of plastic parts such as highway shading Injection molding Blow-molding Film fiber (Textile/Yarn) flame retardant for polypropylene fiber and plastic electrical devices used in the manufacture of various parts for refrigerators, air conditioners, televisions, machinery and other industrial sectors can be used for water supply and drainage of cold, the manufacture of hot water pipe and pipe fittings has the characteristics of high strength, good creep resistance and excellent moisture and heat aging resistance used as coating and plastic processing aid used in the production of extrusion film, composite membrane plastic products used for cigarette filter tow oil used in the production of electrical appliances, telecommunications, lighting, lighting equipment and flame retardant parts of the television used for car bumper, instrument panel, decorative parts such as warm air casing, anti-friction strip, battery case and door inner panel used in electronics, electrical appliances, instruments, home appliances, light industry, chemical textile, automotive machinery and so on used in light industry sector production of reinforced polypropylene products used as raw materials for further processing of polypropylene pellets and products special oil agent for polypropylene production, smooth, cluster, anti-static and other effects, used for the production of polypropylene multifilament yarn, deformed yarn and heterogeneous yarn used for automotive interior and exterior accessories, engine fans, mechanical accessories, textile equipment, electronic and electrical parts, etc. can be used for cotton spinning, wool spinning, making artificial wool cloth, carpet, non-woven etc. used for making parachute, fishing net, filter cloth, rope, work clothes, clothing, cashmere blanket, artificial fur and so on mainly used for the production of various long and short polypropylene fibers used for the production of polypropylene woven bags, packaging bags, injection molded products and so on |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-09 18:58:34
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