CN111116791A - Production process and production line of green environment-friendly polypropylene high-speed melting spraying material - Google Patents
Production process and production line of green environment-friendly polypropylene high-speed melting spraying material Download PDFInfo
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- CN111116791A CN111116791A CN202010221675.4A CN202010221675A CN111116791A CN 111116791 A CN111116791 A CN 111116791A CN 202010221675 A CN202010221675 A CN 202010221675A CN 111116791 A CN111116791 A CN 111116791A
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F110/00—Homopolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F110/04—Monomers containing three or four carbon atoms
- C08F110/06—Propene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/04—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping pipe stills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
- B01D39/1607—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
- B01D39/1623—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
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- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/44—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds
- D01F6/46—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds of polyolefins
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- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
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Abstract
The invention discloses a production process and a production line of a green environment-friendly polypropylene high-speed melting spray material, wherein the production steps are divided into two parts of polymerization reaction and granulation, a polymerization reaction poison of high-purity raw material propylene is firstly removed in the early stage and then enters a polymerization reactor, a catalyst, a cocatalyst and an electron donor are added into the polymerization reactor, resin produced by the polymerization reaction is conveyed into a degassing bin through a dense phase, conveying gas containing a mixture of hydrocarbon and nitrogen is separated from the resin in the degassing bin, and entrained solids are removed and then the conveying gas enters an exhaust gas recycling machine. The granulating process is that polypropylene resin powder and additive are added into a master batch preparation tank, a spiral blender is used for mixing uniformly to prepare master batch, the master batch is subjected to vacuum degassing twice by a feed cylinder of an extruder, a material strip output from a neck mold enters a cooling water tank for cooling and a blower for degassing, the material strip enters an air knife for granulating after being drawn, enters a vibrating screen to obtain high-melt mass flow rate polypropylene particles with proper particle size, and the high-melt mass flow rate polypropylene particles are subjected to standing degassing and then are packaged into products.
Description
Technical Field
The invention relates to the technical field of respiratory protection materials, in particular to a production process of a green environment-friendly polypropylene high-speed melting spraying material for manufacturing mask middle-layer melt-blown non-woven fabrics.
Background
Since the outbreak of the novel coronary pneumonia in 2019, the regulations that the mask needs to be worn in public places are continuously provided in various places, medical and health products such as the mask become the most important respiratory protection products, and the wearing of the mask gradually becomes a habitual behavior of people going out. The mask, especially the medical mask, plays an important role in the aspects of making good respiratory protection, preventing respiratory diseases and the like.
Medical masks are generally constructed of three layers of nonwoven fabric. The outer layer and the inner layer are made of spun-bonded non-woven fabrics, the spun-bonded non-woven fabrics are made of spun-bonded polymer fibers with uniform diameters, the fiber fineness is large, the strength is good, and the fabric has the advantages of good air permeability, good water absorption (inner layer), strong permeability resistance (outer layer), good hand feeling, strong sealing property, softness, lightness and the like. The middle layer is made of melt-blown non-woven fabrics, the melt-blown polymer fibers have the characteristics of superfine fibers and different lengths, so that the melt-blown non-woven fabrics have the remarkable advantages of small fiber size, large specific surface area, high porosity and weak strength on a microscopic scale, and the high coverage rate of the superfine fibers endows the melt-blown non-woven fabrics with high-efficiency deep filtration performance, good bacterium resistance, low air resistance and the like. In consideration of productivity, energy consumption and other factors, polymer raw materials with higher melt index (melt mass flow rate) are mostly adopted in practical production.
However, the melt-blown nonwoven fabric materials in the market at present are not properly selected and the manufacturing process is not perfect, so that the following defects exist in the prior art:
(1) most of melt-blown non-woven fabric products are powder materials polymerized by a catalyst containing phthalate plasticizer, and the plasticizer has great harm to human bodies, so that people can suffer from cancer, infertility, precocious puberty of children, damage to genitals, and gene damage and the like.
(2) The melt-blown nonwoven products are odorous and off-flavored.
The raw material high-melt index polypropylene for melt-blown non-woven fabric production adopts a process of adding peroxide into low-melt index polypropylene for degradation generation. The low melting point means that when polypropylene rapidly passes through a barrel of a granulating extruder, peroxide is not degraded by 100%, the degradation reaction cannot be completely finished, and residual peroxide can be remained in the high melting point polypropylene raw material and continuously decomposed along with the lapse of time to initiate polymerization reaction, and on the other hand, the residual peroxide can be attached to the surface of the high melting point polypropylene raw material or can migrate out of the high melting point polypropylene raw material to enter the gas atmosphere of the raw material. Residual peroxide which is not completely decomposed and reacted can enter the non-woven fabric product under the condition of high-temperature melt-blowing, so that the non-woven fabric product has odor and even peculiar smell.
(3) The melt-blown nonwoven fabric is yellow in color.
The yellowing of the melt-blown non-woven fabric can be related to residual peroxide on one hand and the melt-blown process of the high-melt-index polypropylene raw material on the other hand, and the improper control of the melt-blown process can cause the aging of the high-melt-index polypropylene, thereby generating yellowing.
(4) Meltblown nonwovens are not stable in grammage.
The unstable gram weight is mainly related to the uniformity of melt-blown raw materials, such as the wide molecular weight distribution of polypropylene with high melt index and the large fluctuation of melt index, and the non-uniform phenomenon can occur in the fiber web structure of superfine fibers after melt-blowing. When the melt index is too low, part of melt filaments are not completely drawn into fibers, namely, the melt filaments are separated from spinneret orifices and enter non-woven fabrics, so that the phenomenon of unstable gram weight can be caused, and even gel particles can appear when the relative molecular mass is too high and the viscosity is very high, so that the unstable gram weight can be caused. When the melt index is too high, part of melt filaments are excessively drawn, and the generated ultra-short fibers fly into the air and even cannot be collected, so that the phenomenon of unstable gram weight is caused.
(5) The melt-blown non-woven fabric has hard hand feeling.
The non-woven fabric produced by the polypropylene melt-blowing process is thicker and has high strength if the melt index is low, and is thinner and has low strength if the melt index is high, the non-woven fabric produced by the polypropylene melt-blowing process has harder hand feeling, and the non-woven fabric produced by the polypropylene melt-blowing process has softer hand feeling.
(6) The product has low high-grade product rate.
The performance of the high-melt index polypropylene raw material is unstable, and the subsequent melt-blowing process is difficult to accurately control, so that the ratio of the top grade to the grade of the non-woven fabric product is low.
(7) The high melt index polypropylene production process frequently changes the net and draws the material strip to break.
Because a very dense filter screen needs to be configured in the production process of the high-melting polypropylene, if the ash content in the low-melting polypropylene raw material is too high and contains too many impurities, the filter screen can be blocked, and the production efficiency and the product quality are seriously influenced. Frequent replacement of the filter screen also results in broken strips and the production of a large amount of waste. Too high ash content can also cause short replacement period of a spinneret plate in the production process of the melt-blown non-woven fabric.
(8) And breaking filaments in the production process of the melt-blown non-woven fabric.
If the high-melting-index polypropylene raw material has too wide distribution of relative molecular mass and too much content of low-relative molecular mass polypropylene, the polypropylene is more cracked under stress, and the non-woven fabric is easy to break in the production process, so that the service performance of the non-woven fabric is influenced.
Disclosure of Invention
In view of the above, the present invention is directed to the defects of the prior art, and the main objective of the present invention is to provide a production process and a production line for a green environment-friendly polypropylene high-speed melt-spray material, so as to overcome the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a production process of a green environment-friendly polypropylene high-speed melting spray material comprises the following steps
(1) Polymerisation reaction
Removing polymerization reaction poisons from high-purity raw material propylene by a propylene refining system: water, oxygen, ethanol and sulfide are sent into a polymerization reaction system by a propylene feed pump for polymerization reaction, a plasticizer-free slurry catalyst enters a polymerization reactor from a catalyst container by a catalyst feed pump, a liquid additive TEAL is used as a cocatalyst and is added into a circulating gas pipeline at the inlet of the polymerization reactor, an electron donor is injected into the polymerization reactor by an electron donor feed pump, hydrogen is pressurized and filtered and then enters the polymerization reactor for reaction, the polymerization reaction is carried out in the polymerization reactor, the reaction temperature is 70 +/-1 ℃, the reaction pressure is 3.1 +/-0.2 MPa, the produced resin enters a degassing bin by dense phase conveying, conveying gas containing a mixture of hydrocarbon and nitrogen is separated from the resin in the degassing bin, entrained solids are removed and then enters a discharge gas recycling machine to obtain polypropylene resin powder;
(2) granulating
Adding polypropylene resin powder and an additive into a master batch preparation tank according to a weight ratio, and uniformly mixing by using a spiral blender to prepare a master batch; the additive comprises 300-2000 ppm of antioxidant, 500-5000 ppm of stabilizer and 300-1500 ppm of acid scavenger; adding the master batch into a granulating extruder, gradually and stably adding 2000-200000 ppm of peroxide degradation agent according to the weight ratio, mixing and melting the master batch by the granulating extruder, performing vacuum degassing twice by a granulating extruder material cylinder, cooling a material strip output from a neck mold in a cooling water tank, degassing by a blower, dragging the material strip into an air knife for granulation, feeding the material strip into a vibrating screen to obtain high-melt index polypropylene particles with proper particle size, standing for more than 24 hours to eliminate the smell of the product, and packaging the product;
performing melt index analysis on the high-melt index polypropylene particles at least once/20 min, and adjusting the process to ensure that the melt index reaches 500-2000g/10min and the relative molecular mass distribution is less than 3;
the temperature of the outlet of the product blower degassing facility is 40-60 ℃, so that residual odor of the product is removed.
A production line of green environment-friendly polypropylene high-speed melting spraying material structurally comprises
A propylene refining system which is communicated with a polymerization reactor of the polymerization reaction system through a propylene feeding pump;
a polymerization reaction system, wherein the polymerization reaction system is provided with a polymerization reactor, a catalyst container, a cocatalyst container, an electron donor container and a hydrogen container; said catalyst vessel being connected to a polymerization reactor by a catalyst feed pump; said cocatalyst vessel being connected to the polymerization reactor by a cocatalyst feed pump; the electron donor container is communicated to the polymerization reactor through an electron donor feeding pump; the hydrogen container is communicated to the polymerization reactor through a pressurizing and filtering device;
the degassing system is provided with a degassing bin and an exhaust gas recovery machine, the degassing bin is connected with the polymerization reactor through a dense phase delivery pump, and the degassing bin is connected with the exhaust gas recovery machine;
the granulating system comprises a master batch preparation tank, a granulating extruder, a cooling water tank, a blower and a dryer; the master batch preparation tank is respectively connected with the antioxidant container, the stabilizer container, the acid scavenger container and the degradation agent container to receive the additives; a granulating extruder is connected into the master batch preparation tank, a charging barrel of the granulating extruder is provided with a two-stage vacuum degassing structure, and a cooling water tank, a blower and a dryer are sequentially arranged at the downstream of the granulating extruder;
and the packaging system comprises a material cutting air knife, a vibrating sieving machine and an automatic packaging machine, wherein the output of the material cutting air knife is communicated to the vibrating sieving machine, and finally, the automatic packaging machine packages the material particles.
Compared with the prior art, the invention has obvious advantages and beneficial effects, and particularly, as can be seen from the technical scheme,
the impurity content of the refined propylene from the source is controlled, so that the factors of weak catalyst activity, unstable production load and the like in the production process are eliminated, the stability of the performance of the high-melt index polypropylene product is improved, the melt flow performance is good, the high-level stretchability, uniformity and spinnability are realized, the dispersibility of the spinning fiber is good, the web formation is uniform, the yarn doubling and yarn floating phenomena are avoided, the high-grade melt-blown polypropylene fiber has better adaptability when being used for light, thin and high-performance products, the material consumption is reduced, and the product top-grade rate of the melt-blown non-woven fabric is improved.
The five-stage degassing system ensures that the cracking rate of the degradation agent is more than 97 percent, effectively reduces the odor of the product and is beneficial to solving the problem that the color of the melt-blown non-woven fabric is yellow. The five-stage degassing comprises a resin degassing system after the polymerization reaction, a vacuum degassing I of a granulating extruder, a vacuum degassing II of the granulating extruder, degassing by an air extractor and standing and degassing of a finished product.
The special formula additive improves the heat resistance and oxidation resistance of the polypropylene base material, solves the problems of high yellow index and yellow color of the polypropylene product special for melt-blown non-woven fabrics under the action of the special formula additive and a five-stage degassing system, further improves the processing performance of the polypropylene material special for melt-blown non-woven fabrics, and improves the hand feeling of the melt-blown non-woven fabrics.
The high-activity high-performance catalyst and the external electron donor system can produce high-performance and low-ash polypropylene base materials, and the problems of frequent screen replacement and material strip traction and strip breakage in the production process of high-melt index polypropylene are solved.
By adjusting the addition amount of the degradation agent, the narrow and uniform molecular weight distribution of the polypropylene product is ensured, the uniform and stable gram weight of the melt-blown non-woven fabric is ensured, and the yarn breakage in the production process of the melt-blown non-woven fabric is reduced.
The produced high-melt-index polymer particles are convenient to transport, store and use.
The process parameters are strictly limited in the production process, the quality stability among batches is ensured, and the situation of insufficient mask supply caused by shortage and unstable quality of polypropylene products special for melt-blown non-woven fabrics in China at present can be greatly relieved.
To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a schematic view of a production line of a green environment-friendly polypropylene high-speed melt-blown material according to an embodiment of the present invention.
FIG. 2 is a flow chart of the production process of the environmentally friendly polypropylene high-speed melt-blown material according to the embodiment of the present invention.
The attached drawings indicate the following:
10. propylene refining system 11 and propylene feed pump
20. Polymerization reaction system 21 and polymerization reactor
211. Temperature control device 212 and pressure control device
22. Catalyst container 221, catalyst feed pump
23. Cocatalyst container 231, cocatalyst feed pump
24. An electron donor container 241, an electron donor feeding pump
25. Hydrogen container 251, pressure boost filter equipment
30. Degassing system 31, degasification storehouse
311. Dense phase transfer pump 32, exhaust gas recovery machine
40. Granulation system 41 and masterbatch preparation tank
412. Antioxidant container 413 and stabilizer container
414. Acid scavenger container 415, degradation agent container
42. Granulation extruder 421, two-stage vacuum degassing structure
43. Cooling water tank 44 and blower
45. Dryer 50 and packaging system
51. Material cutting air knife 52 and vibration screening machine
53. An automatic packaging machine.
Detailed Description
Referring to fig. 1, a specific structure of a preferred embodiment of the present invention is shown, which is a production process of a green environment-friendly polypropylene high-speed melt-blown material, and a preparation process and quality control from raw material propylene to a polypropylene product special for melt-blown non-woven fabric solve the product quality problems of the existing product, such as plasticizer-containing product, heavy smell, yellow color, unstable weight, poor hand feeling, low quality product rate, etc., and the processing performance is unstable in the existing production process, and can produce a green melt-blown non-woven fabric special polypropylene product with excellent performance.
The production of the invention is based on an automatic production line, and the equipment mainly comprises raw material supply and refining, a polymerization reactor 21, an exhaust gas recovery machine 32, resin degassing and the like. All the devices are connected in sequence to form a production line, so that automatic conveying and continuous operation can be realized, manual interference is reduced, cost is reduced, and efficiency is improved. In particular, the production line of the invention can be referred to the schematic diagram 1:
the propylene purification system 10 is connected to a polymerization reactor 21 of the polymerization system 20 by a propylene feed pump 11.
The polymerization reaction system 20 includes a polymerization reactor 21, a catalyst container 22, a cocatalyst container 23, an electron donor container 24, a hydrogen container 25, and the like. These containers may be, for example, cans. Wherein the catalyst vessel is connected to the polymerization reactor 21 by a catalyst feed pump 221. The cocatalyst vessel 23 is connected to the polymerization reactor 21 via a cocatalyst feed pump 231. The electron donor vessel 24 is connected to the polymerization reactor 21 via an electron donor feed pump 241. The hydrogen vessel 25 is connected to the polymerization reactor 21 through a pressurized filter device 251.
The polymerization reactor 21 is provided with a temperature control device 211 and a pressure control device 212. The temperature control device 211 comprises a heater and a temperature sensor, and when the temperature sensor detects that the temperature of the polymerization reactor 21 is higher than the upper limit of the preset value, the heating is stopped; when the temperature of the polymerization reactor 21 is detected to be lower than the lower limit of the preset value, the dynamic heating is started, thereby ensuring that the polymerization reaction is completed at the specific temperature. The pressure control device 212 comprises a pressure sensor arranged on the main pipeline of the polymerization reactor 21 and a controller interlocked with the conveying pipelines of each container, and when the pressure sensor detects that the pressure of the polymerization reactor 21 is higher than the upper limit of a preset value, the pressure sensor is closed to stop the input of the incoming materials of each container; when it is detected that the pressure in the polymerization reactor 21 is lower than the lower limit of the preset value, a controller, such as a valve, in the transfer line is opened.
Degassing system 30: the degassing bin 31 is connected with the polymerization reactor 21 through a dense phase transfer pump 311, and the degassing bin 31 is connected with a discharge gas recoverer 32.
The pelletizing system 40 includes a masterbatch preparation tank 41, a pelletizing extruder 42, a cooling water tank 43, a blower 44, and a dryer 45. The antioxidant container 412 is connected to the masterbatch preparation tank 41 by an antioxidant transfer pump. The stabilizer container 413 is connected to the masterbatch preparation tank 41 via a stabilizer feed pump. The acid scavenger container 414 is connected to the masterbatch compounding tank 41 by an acid scavenger transfer pump. The degradant container 415 is connected to the masterbatch compounding tank 41 by a degradant delivery pump. Each container is, for example, a reservoir, which may have a valve in addition to the connection to the pump. The masterbatch preparation tank 41 is also provided with a spiral blender to mix the masterbatch and each solvent sufficiently and uniformly.
The pelletizing extruder 42 is connected to a masterbatch compounding tank and receives the masterbatch for pelletizing. The barrel of the pelletizing extruder 42 has a two-stage vacuum degassing configuration 421. A cooling water tank 43, a blower 44, and a dryer 45 are provided in this order downstream of the granulating extruder 42.
The output of the cutting air knife 51 of the packaging system is communicated to a vibrating sieving machine 52, and finally, the material particles are packaged by an automatic packaging machine 53.
Based on the above, the production process of the green environment-friendly polypropylene high-speed melt-spraying material disclosed by the invention, referring to fig. 2, comprises the following steps:
(1) and (4) carrying out polymerization reaction.
High-purity raw material propylene is subjected to removal of polymerization reaction poisons such as water, oxygen, ethanol, sulfide and the like through a propylene refining system 10, then is sent to a polymerization reaction system through a propylene feeding pump 11 for polymerization reaction, slurry catalyst without plasticizer enters a polymerization reactor from a catalyst container through a catalyst feeding pump 221, liquid additive TEAL is used as a cocatalyst and is added to the polymerization reactor, electron donor is injected into the polymerization reactor through an electron donor feeding pump 241, and hydrogen is pressurized and filtered and then enters the polymerization reactor to participate in reaction. The polymerization reaction is carried out in a polymerization reactor, the reaction temperature is 70 +/-1 ℃, the reaction pressure is 3.1 +/-0.2 MPa, the produced resin enters a degassing bin 31 through dense phase conveying, conveying gas containing a mixture of hydrocarbon and nitrogen is separated from the resin in the degassing bin 31, entrained solids are removed, and the conveying gas enters an exhaust gas recovery machine 32 to obtain the polypropylene resin powder.
The polypropylene resin powder is used as a granulation base material and enters a granulation system 40. The physical property analysis frequency of the polypropylene resin powder is at least once/1 hour, and the analysis data is ensured to be timely and accurate.
(2) And (6) granulating.
The polypropylene resin powder and the additive are added into a master batch preparation tank 41, and are uniformly mixed by a spiral blender to prepare the master batch. The additive contains 300-2000 ppm of antioxidant, 500-5000 ppm of stabilizer and 300-1500 ppm of acid scavenger;
adding the master batch into a granulating extruder, gradually and stably adding a peroxide degradation agent to 2000-200000 ppm by weight ratio, mixing and melting the master batch by the granulating extruder 42, performing vacuum degassing twice by a charging barrel of the granulating extruder 42, cooling a material strip output from a neck mold in a cooling water tank 43, degassing by a blower 44, drying, drawing the material strip into an air knife for granulating, feeding the material strip into a vibrating screen to obtain high-melt-index polypropylene particles with proper particle size, and packaging the high-melt-index polypropylene particles into a product.
Performing melt index analysis on the high-melt index polypropylene particles at least once/20 min, and adjusting the process to ensure that the melt index reaches 500-2000g/10min and the relative molecular mass distribution is less than 3;
the product blower 44 deaerates the plant outlet at a temperature of 40-60 ℃ to remove residual odor from the product.
In the embodiment, the production process of the green environment-friendly polypropylene high-speed melting spraying material has the following advantages:
1. the polymerization reaction adopts a propylene polymerization process, and adopts raw material propylene with the purity of more than 99.75 percent, a high-activity high-performance plasticizer-free catalyst and an external electron donor.
(1) The analysis data of the high-purity raw material propylene does not exceed standard terms, the indexes of sulfur and alcohols do not exceed standard, and the purity of the propylene reaches more than 99.75 percent;
(2) the adding amount of a catalyst for polymerization reaction is kept stable, the adding amount of an electron donor is adjusted according to the aluminum/silicon ratio = 2.0-5.0, and the adding amount of TEAL is adjusted according to the aluminum/titanium ratio = 45-70;
(3) the analysis frequency of the polypropylene resin powder melt index and xylene solubles is at least once/1 hour, so that the analysis data is timely and accurate;
(4) the molecular weight of the polypropylene resin powder is controlled to be about 50000-300000, the isotactic index is more than or equal to 95 percent, and the yellow index is controlled to be less than 3;
(5) the ash content of the polypropylene resin powder is controlled to be 30-60 ppm.
2. The granulation process adopts special formula additives and high-activity degradation agents.
(1) The special formula additive is prepared from an antioxidant, a stabilizer and an acid scavenger according to a weight ratio.
(2) The peroxide degradation agent adopts high-activity peroxide, the purity is more than 90 percent, the active oxygen content is more than 5 percent, the weight proportion is more than 2000-20000ppm, and the cracking rate of the peroxide degradation agent in the production process is ensured to be more than 97 percent according to the half-life calculation.
3. And (3) obtaining a product with a qualified particle size by adopting a vibrating screen, and standing the particles for more than 24 hours to eliminate the smell of the product.
The impurity content of the refined propylene from the source is controlled, so that the factors of weak catalyst activity, unstable production load and the like in the production process are eliminated, the stability of the performance of the high-melt index polypropylene product is improved, the melt flow performance is good, the high-level stretchability, uniformity and spinnability are realized, the dispersibility of the spinning fiber is good, the web formation is uniform, the yarn doubling and yarn floating phenomena are avoided, the high-grade melt-blown polypropylene fiber has better adaptability when being used for light, thin and high-performance products, the material consumption is reduced, and the product top-grade rate of the melt-blown non-woven fabric is improved.
The five-stage degassing system 30 ensures that the cracking rate of the peroxide degradation agent is over 97 percent, effectively reduces the odor of the product, and is beneficial to solving the problem that the color of the melt-blown non-woven fabric is yellow. The five-stage degassing comprises a resin degassing system 30 after the polymerization reaction, a vacuum degassing I of a granulating extruder 42, a vacuum degassing II of the granulating extruder 42, degassing by an air extractor and standing and degassing of a finished product. The finished product is subjected to standing and degassing, namely a product with qualified particle size is obtained by adopting a vibrating screen, and the particles are subjected to standing for more than 24 hours to eliminate the smell of the product.
The special formula additive improves the heat resistance and oxidation resistance of the polypropylene base material, solves the problems of high yellow index and yellow color of the polypropylene product special for melt-blown non-woven fabrics by cooperating with the five-stage degassing system 30, further improves the processing performance of the polypropylene material special for melt-blown non-woven fabrics, and improves the hand feeling of the melt-blown non-woven fabrics.
The high-activity high-performance catalyst and the external electron donor system can produce high-performance low-ash polypropylene resin powder, and reduce the problems of frequent screen replacement and material strip traction and strip breakage in the production process of high-melt-index polypropylene.
By adjusting the addition of the peroxide degradation agent, the narrow and uniform molecular weight distribution of the polypropylene product is ensured, the uniform and stable gram weight of the melt-blown non-woven fabric is ensured, and the yarn breakage in the production process of the melt-blown non-woven fabric is reduced.
The produced high-melt-index polypropylene particles are convenient to transport, store and use.
The process parameters are strictly limited in the production process, the quality stability among batches is ensured, and the situation of insufficient mask supply caused by shortage and unstable quality of polypropylene products special for melt-blown non-woven fabrics in China at present can be greatly relieved.
Application example
Taking a project of 60 ten thousand tons/year propane dehydrogenation for preparing high-performance propylene by using Dongguan Ju Zhengyuan science and technology Limited company as an example, the concrete steps are as follows:
according to the production process of the green environment-friendly polypropylene high-speed melting spray material, provided by the invention, the production steps are divided into two parts, namely polymerization reaction and granulation, in the early stage, a polymerization reaction poison of raw material propylene with the purity of 99.75% is removed, and then the raw material propylene enters a reactor, a catalyst, a cocatalyst and an electron donor are added into the reactor, resin produced by the polymerization reaction is conveyed into a degassing bin through a dense phase, and conveying gas containing a mixture of hydrocarbon and nitrogen is separated from the resin in the degassing bin, and the conveying gas is conveyed into an exhaust gas recycling machine after entrained solids are removed. The granulating process is that polypropylene resin powder and additive are added into a master batch preparation tank, a spiral blender is used for mixing uniformly to prepare master batch, the master batch is subjected to vacuum degassing twice by a feed cylinder of an extruder, a material strip output from a neck mold enters a cooling water tank for cooling and a blower for degassing, the material strip enters an air knife for granulating after being drawn, enters a vibrating screen to obtain high-melt mass flow rate polypropylene particles with proper particle size, and the high-melt mass flow rate polypropylene particles are subjected to standing degassing and then are packaged into products. According to the process, the annual output of the environment-friendly polypropylene high-speed melting spraying material can reach 60 ten thousand tons.
The high-melt index polypropylene raw material for producing the melt-blown non-woven fabric of the mask middle layer is produced based on the invention, the melt-blown non-woven fabric is put into production at present, about 100 ten thousand pieces of common disposable medical masks can be produced according to one ton of melt-blown fabric, the produced melt-blown fabric polypropylene can meet the production requirement of 6000 ten thousand masks, and the shortage situation of medical and health materials at present can be effectively relieved. And the tested fiber of the melt-blown non-woven fabric is superfine and less than 10 mu m, most of the fiber is 1-4 mu m, and the particle filtering efficiency is over 95 percent.
The special polypropylene material for melt-blown is prepared by using polypropylene as basic material and through controllable rheological process and advanced blending modification process, and has relatively low molecular weight, narrow molecular weight distribution and melt index of 500-2000g/10 min. The special material for polypropylene melt-blowing requires low polymer melt viscosity, stable melt index, low ash content and stable comprehensive performance. Polypropylene meltblown specials can be used in a number of fields including, but not limited to: medical and health materials, heat preservation materials, filtering materials, oil absorption materials, battery diaphragm materials, environment protection materials and the like.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the technical scope of the present invention.
Claims (9)
1. A production process of a green environment-friendly polypropylene high-speed melting spraying material is characterized by comprising the following steps: comprises the following steps
(1) Polymerisation reaction
Removing polymerization reaction poisons from high-purity raw material propylene by a propylene refining system: water, oxygen, ethanol and sulfide are sent into a polymerization reaction system by a propylene feed pump for polymerization reaction, a plasticizer-free slurry catalyst enters a polymerization reactor from a catalyst container by a catalyst feed pump, a liquid additive TEAL is used as a cocatalyst and is added into a circulating gas pipeline at the inlet of the polymerization reactor, an electron donor is injected into the polymerization reactor by an electron donor feed pump, hydrogen is pressurized and filtered, then enters the polymerization reactor for reaction, the polymerization reaction is carried out in the polymerization reactor, the reaction temperature is 70 +/-1 ℃, the reaction pressure is 3.1 +/-0.2 MPa, the produced resin enters a degassing bin by dense phase conveying, conveying gas containing a mixture of hydrocarbon and nitrogen is separated from the resin in the degassing bin, entrained solids are removed, and then the conveying gas enters a discharge gas recycling machine to obtain polypropylene resin powder;
(2) granulating
Adding polypropylene resin powder and an additive into a master batch preparation tank according to a weight ratio, and uniformly mixing by using a spiral blender to prepare a master batch; the additive contains: 300-2000 ppm of antioxidant, 500-5000 ppm of stabilizer and 300-1500 ppm of acid scavenger; adding the master batch into a granulating extruder, gradually and stably adding 2000-200000 ppm of peroxide degradation agent according to the weight ratio, mixing and melting the master batch by the granulating extruder, performing vacuum degassing twice by a granulating extruder material cylinder, cooling a material strip output from a neck mold in a cooling water tank, degassing by a blower, dragging the material strip into an air knife for granulation, feeding the material strip into a vibrating screen to obtain high-melt index polypropylene particles with proper particle size, standing for more than 24 hours to eliminate the smell of the product, and packaging the product;
performing melt index analysis on the high-melt index polypropylene particles at least once/20 min, and adjusting the process to ensure that the melt index reaches 500-2000g/10min and the relative molecular mass distribution is less than 3;
the temperature of the outlet of the product blower degassing facility is 40-60 ℃, so that residual odor of the product is removed.
2. The production process of the green environment-friendly polypropylene high-speed melt-spraying material according to claim 1, characterized by comprising the following steps: the high-purity raw material propylene refers to raw material propylene with the purity of more than 99.75 percent.
3. The production process of the green environment-friendly polypropylene high-speed melt-spraying material according to claim 1, characterized by comprising the following steps: in the polymerization reaction in the step (1), the adding amount of the slurry catalyst is kept stable, the adding amount of the electron donor is adjusted according to the aluminum/silicon ratio = 2.0-5.0, and the adding amount of the cocatalyst TEAL is adjusted according to the aluminum/titanium ratio = 45-70.
4. The production process of the green environment-friendly polypropylene high-speed melt-spraying material according to claim 1, characterized by comprising the following steps: the polypropylene resin powder is used as a granulation base material and enters a granulation system, the analysis frequency of the melt index of the polypropylene resin powder and xylene solubles is at least once/1 hour, and the analysis data is ensured to be timely and accurate.
5. The production process of the green environment-friendly polypropylene high-speed melt-spraying material according to claim 4, characterized in that: the molecular weight of the polypropylene resin powder is controlled to be 50000-300000, the isotactic index is more than or equal to 95 percent, and the yellow index is controlled to be less than 3; the ash content of the polypropylene resin powder is controlled to be 30-60 ppm.
6. The production process of the green environment-friendly polypropylene high-speed melt-spraying material according to claim 1, characterized by comprising the following steps: the peroxide degradation agent adopts high-activity peroxide, the purity is more than 90%, the active oxygen content is more than 5%, and the cracking rate of the degradation agent in the production process is ensured to be more than 97% according to the half-life calculation.
7. The production process of the green environment-friendly polypropylene high-speed melt-spraying material according to claim 1, characterized by comprising the following steps: and a five-stage degassing system is adopted to ensure that the cracking rate of the degradation agent is over 97 percent, the five-stage degassing comprises a resin degassing system after polymerization reaction, a granulation extruder vacuum degassing I, a granulation extruder vacuum degassing II, blower degassing and finished product standing degassing, and the finished product standing degassing means that a vibrating screen is adopted to obtain a product with a qualified particle size, and the particles are allowed to stand for over 24 hours to eliminate the smell of the product.
8. The utility model provides a production line of material is spouted in high-speed melting of green polypropylene which characterized in that: the production process of the green environment-friendly polypropylene high-speed melt-spraying material for the claims 1 to 7, which structurally comprises
A propylene refining system (10), wherein the propylene refining system (10) is communicated with a polymerization reactor (21) of the polymerization reaction system (20) through a propylene feeding pump (11);
a polymerization reaction system (20), wherein the polymerization reaction system (20) is provided with a polymerization reactor (21), a catalyst container (22), a cocatalyst container (23), an electron donor container (24) and a hydrogen container (25); the catalyst container (22) is communicated with the polymerization reactor (21) through a catalyst feeding pump (221), the cocatalyst container (23) is communicated with the polymerization reactor (21) through a cocatalyst feeding pump (231), the electron donor container (24) is communicated with the polymerization reactor (21) through an electron donor feeding pump (241), and the hydrogen container (25) is communicated with the polymerization reactor (21) through a pressurized filtering device (251);
a degassing system (30), wherein the degassing system (30) is provided with a degassing bin (31) and an exhaust gas recovery machine (32), the degassing bin (31) is connected with the polymerization reactor (21) through a dense phase conveying pump (311), and the degassing bin (31) is connected with the exhaust gas recovery machine (32);
a granulating system (40), wherein the granulating system (40) comprises a master batch preparation tank (41), a granulating extruder (42), a cooling water tank (43), a blower (44) and a dryer (45); the master batch preparation tank (41) is respectively connected with the antioxidant container, the stabilizer container, the acid scavenger container and the degradation agent container to receive the additives; a granulating extruder (42) is connected into the master batch preparation tank, a cylinder of the granulating extruder (42) is provided with a two-stage vacuum degassing structure (421), and a cooling water tank (43), a blower (44) and a dryer (45) are sequentially arranged at the downstream of the granulating extruder (42);
a packaging system (50) comprises a material cutting air knife (51), a vibrating screening machine (52) and an automatic packaging machine (53), wherein the output of the material cutting air knife (51) is communicated to the vibrating screening machine (52), and finally, the automatic packaging machine (53) packages the material particles.
9. The production line of green environmental polypropylene high-speed melt-blown material according to claim 8, characterized in that: a temperature control device (211) and a pressure control device (212) are arranged on the polymerization reactor (21); the temperature control device (211) comprises a heater and a temperature sensor; the pressure control device (212) comprises a pressure sensor arranged on the main pipeline of the polymerization reactor (21) and a controller interlocked with each container conveying pipeline.
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| CN112358560A (en) * | 2020-10-21 | 2021-02-12 | 中国石油化工股份有限公司 | System and method for producing odorless polypropylene granular product |
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Application publication date: 20200508 Assignee: DONGGUAN GOLDEN SOURCE PLASTIC TECHNOLOGY Co.,Ltd. Assignor: Dongguan juzhengyuan Technology Co.,Ltd. Contract record no.: X2021980000783 Denomination of invention: Production process and production line of a green environmental protection polypropylene high speed melt blown material Granted publication date: 20200703 License type: Common License Record date: 20210127 |
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