CN113912945A - Low-ash low-odor high-melt-index polypropylene with narrow molecular weight distribution and preparation method thereof - Google Patents
Low-ash low-odor high-melt-index polypropylene with narrow molecular weight distribution and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a high melt index polypropylene with low ash content, low odor and narrow molecular weight distribution and a preparation method thereof.
Description
Technical Field
The invention relates to the field of high polymer materials, in particular to a high-melt-index polypropylene with low ash content, low smell and narrow molecular weight distribution and a preparation method thereof.
Background
From 2019, the capacity of polypropylene in China is increased explosively, and 1000 ten thousand tons of polypropylene are expected to be newly added in 2019-2022. In 2022, the capacity of polypropylene in China exceeds 3000 ten thousand tons, but the market demand of polypropylene in 2019 is 2400 ten thousand tons. The development of high-end, differentiated and diversified products for polypropylene is imperative, the stable market is facilitated, the inherent advantages of enterprises are brought into play, and larger profits are grabbed from the high-end market. The high melt index polypropylene generally refers to a polypropylene material with an extremely high melt index, is used as a main raw material of melt-blown process non-woven fabrics, and is a core material of products such as masks, protective clothing, diapers, automobile soundproof cotton and the like. The technical scheme for preparing the melt-blown material comprises three steps: hydrogen regulating process, high-melt index polypropylene production with new catalyst and controllable rheological process. The hydrogen regulation method has a limited regulation range, usually needs to be matched with a high-hydrogen sensitive catalyst, and the molecular weight distribution of the product is wide. The fiber grade polypropylene resin can be directly polymerized by using a novel catalyst, such as a special metallocene catalyst. The technology has the advantages of narrow molecular weight distribution and no odor. But compared with the controllable rheological method, the spinning effect is not obviously improved, the cost is higher, and the process is complex. The controlled rheology method, also called degradation method, is to add peroxide radical initiator (such as 301, 101, DTBP, etc.) into polypropylene, and the peroxide radical causes the most stressed link on PP molecular chain to be chemically degraded. The method can preferentially break the middle part of the macromolecular chain, so that the macromolecular part is degraded more, the small molecular part is not changed much, the content of the intermediate component is improved, and the molecular weight distribution is narrowed. Its advantages are low cost, wide adjustable range of melt index, narrow molecular weight distribution and flexible production. Currently, the method for finishing modification under a production line by adopting a controllable rheological method is a mainstream preparation method of melt-blown materials.
In the prior art, the polypropylene is degraded by adding peroxide to produce an ultrahigh-fluidity polypropylene product, and a small molecular byproduct containing more initiator residues and formed by a free radical degradation reaction is formed, so that the Volatile Organic Compound (VOC) content of the product is higher, and the odor grade generally exceeds the industrial hygiene requirement. However, as the living standard and quality of life of people are continuously improved and the awareness of health and environmental protection is continuously enhanced, the odor parameters become key indexes for judging the product quality as the respiratory protection products closely related to human health. Therefore, it is necessary for those skilled in the art to provide a high melt index polypropylene which has low odor, narrow molecular weight distribution, low ash content, and the like.
Disclosure of Invention
In order to overcome the defects of wide molecular weight distribution, large smell, high ash content and the like of the high-melt-index polypropylene, the invention provides the high-melt-index polypropylene with low ash content, low smell and narrow molecular weight distribution and the preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of high-melt-index polypropylene with low ash content, low odor and narrow molecular weight distribution comprises the following steps:
1) adding 92-97 parts of polypropylene, 1-4 parts of degrading agent, 1-5 parts of distilled water, 0.1-0.5 part of soapberry extract and 0.08-0.2 part of compound antioxidant into a pre-mixer according to the mass parts for mixing.
2) And (2) feeding the mixture obtained in the step (1) through a feed inlet of a double-screw extruder, and carrying out traction and granulation to obtain the high-melt-index polypropylene material.
Further, in the step 1) of the technical scheme, the concrete mixing process comprises the following steps: adding polypropylene, a degrading agent, a soapberry extract and a compound antioxidant into a premixer for mixing for 20min, then adding half of distilled water into the premixer in a spraying manner for mixing for 5min, and finally adding the rest of distilled water into the premixer in a spraying manner for mixing for 5 min.
Further, in the step 1) of the technical scheme, the temperature in the charging barrel should not be too high (T is less than or equal to 50 ℃) during the mixing operation, and if the temperature is too high, the mixing operation should be carried out after the temperature is reduced.
Further, in the step 1) of the above technical scheme, the polypropylene is homo-polypropylene or co-polypropylene or a mixture thereof, the melt index range is 2-5 g/10min, the melt index adopts GBT 3682-2000 method B, the test temperature is 230 ℃, and the weight is 2.16 kg.
Further, in step 1) of the above technical solution, the degradation agent is a peroxide initiator, and the peroxide includes one or more of di-tert-butyl peroxide (DTBP), dicumyl peroxide, 2, 5-dimethyl-2, 5-di-tert-butyl hexane peroxide, 3,6, 9-triethyl-3, 6, 9-trimethyl-1, 4, 7-triperoxonane (Trigonox 301), and benzoyl peroxide; preference is given to 2, 5-dimethyl-2, 5-di-tert-butylperoxyhexane (101), 3,6, 9-triethyl-3, 6, 9-trimethyl-1, 4, 7-triperoxonane (Trigonox 301).
Further, in the step 1) of the technical scheme, the soapberry fruit extract is a pure natural surfactant, and has the characteristics of no harm to human bodies and no pollution to water sources. It also has effects in improving skin quality, and making skin delicate, glossy and elastic. It also has antibacterial, antiinflammatory, antioxidant, free radical scavenging, and anticoagulant effects. The soapberry fruit extract mainly contains 40wt% of soapberry saponin (sapindussaponin), fatty oil, protein and other substances. Purchased from Baojirundekang Biotech limited.
Further, in the step 1) of the technical scheme, the compound antioxidant is a polypropylene melt-blown compound agent produced by Beijing Jihaichuan scientific and technological development Limited company, the model is JHC7547, the compound antioxidant comprises main components of main antioxidant and auxiliary antioxidant (1010 + 168) ≥ 50%, nucleating agent ≥ 40%, and acid absorbent ≥ 10%, decomposition products mainly comprise CO, CaO and CO2、H2O, HX, the compounded agent is mainly used in the modification processing or melt-blown cloth processing production of polypropylene melt-blown materials, improves the oxidation resistance and aging resistance of the polypropylene melt-blown materials, and simultaneously improves the processing and shaping speed of polypropylene melt-blown fibers.
Further, the slenderness ratio of twin-screw extruder is 44D, includes 12 sections, is equipped with 1 charge door, 1 deashing mouth and 1 gas vent, and the gas vent is in the second section that is close to the die head, and the deashing mouth is in the fourth section that is close to the die head, and a vacuum pump is added to gas vent department to better faster take out the volatile component. The invention finally obtains the high-melt-index polypropylene with low ash content, low odor and narrow molecular weight distribution by regulating and controlling the equipment, the preparation process, the natural surfactant and the degradation dosage of an extruder, and the polypropylene has more stable performance, less defects in the melt-blowing process and more excellent performance. The high melt index polypropylene prepared by the method has the molecular weight distribution of not more than 2, the ash content of not more than 0.02 percent, the melt index of 1500-. Odor grade no greater than 3.5. Odor was determined according to VDA270: 2018.
Further, the pressure of the vacuum pump is controlled to be-900 to-980 mbar, and the processing temperature of the double-screw extruder is 80 to 280 ℃; the rotation speed is 300-450 rpm. Preferably, the processing temperature of the degradation agent is 301-20, which is 75-85 ℃ in one section, 210 ℃ in two sections, 245 ℃ in three sections, 265 ℃ in four sections, eight sections, 265 ℃ in nine sections, 265 ℃ in 255 sections, 245 ℃ in ten sections, and 185 ℃ in eleven sections, ten sections; the processing temperature of the degrading agent 101-20 is 75-85 ℃ in one section, 255-265 ℃ in two-five sections, 245-255 ℃ in six sections, 195-205 ℃ in seven sections, 175-185 ℃ in eight sections and 155-165 ℃ in nine sections to twelve sections, and the temperature determines the reaction condition of polypropylene and the auxiliary agent and is of great importance to the influence of the result.
The invention discloses a high-melt-index polypropylene with low ash content, low odor and narrow molecular weight distribution and a preparation method thereof.
The invention has the advantages that:
(1) the invention uses natural soapberry fruit extract which is harmless to human body, micro bubbles are formed by utilizing the hydrophilic and hydrophobic effects of the soapberry fruit extract, the micro bubbles are mutually extracted with volatile organic compounds in a melt, and finally the volatile organic compounds are pumped out through vacuum pumping, so that the odor performance of the PP material is finally improved.
(2) Compared with the existing high-melt-index polypropylene, the high-melt-index polypropylene with lower ash content, lower odor grade and narrower molecular weight distribution has fewer defects in the melt-blowing process and more excellent performance.
(3) Compared with the existing high-melt-index polypropylene preparation process, the preparation method has the advantages that materials are mixed at one time, the workload of operators is reduced, and the working efficiency is improved.
(4) Compared with the existing high-melt-index polypropylene, the high-melt-index polypropylene prepared by the invention has lower ash content and lower odor grade, is more beneficial to human health and improves the life quality of people.
(5) Compared with the existing high-melt index polypropylene, the high-melt index polypropylene prepared by the invention has narrower molecular weight distribution and is more beneficial to the later melt-blown processing process.
Drawings
Fig. 1 is a simplified diagram of a sampling device.
Detailed Description
The technical solutions and advantages of the present invention will be more clearly understood by referring to the following specific examples. Those skilled in the art should understand that they can make modifications and equivalents without departing from the spirit and scope of the present invention, and all such modifications and equivalents are intended to be included within the scope of the present invention. The melt index and ash content are measured by SGS and measured by science and technology companies (the difference of the results is within a reasonable range through comparison), and the odor grade, TVOC, VOC and molecular weight distribution are measured by microspectrum and science and technology companies.
Two peroxide degraders were used in this series of experiments: a)101 to 20 percent of 2, 5-dimethyl-2, 5-di (tert-butylperoxy) hexane as an effective component, and the content is 20 percent; b) The degrading agent 301-20 comprises the effective component of 3,6, 9-triethyl-3, 6, 9-trimethyl-1, 4, 7-triperoxonane, the effective content is 20 percent, wherein the effective peroxide content is 18.16 percent, and the manufacturers are all double-material and new-material companies.
The polypropylene adopted in the series of experiments is the L5E89 brand of China quan petrochemical production.
The compound antioxidant adopted in the series of experiments is a polypropylene melt-blown compound agent produced by Beijing Jihaichuan scientific and technological development Limited company, and the model is JHC 7547.
The soapberry fruit extract adopted in the series of experiments mainly contains 40wt% of soapberry saponin, fatty oil, protein and other substances, and is purchased from the biological technology ltd of Baojiruikang.
Example 1
1) Adding 92.5 parts of polypropylene, 204 parts of degrading agent 101-.
2) The replacement and arrangement of the thread elements of the double-screw extruder are completed as required, the thread elements are determined to be intact, no teeth are broken, the arrangement is correct, residues are cleaned up, the angle is correct, the connection between the elements is tight, and the occlusion is smooth.
3) The length-diameter ratio of the adopted double-screw extruder is 44D, the double-screw extruder comprises 12 sections, 1 feeding port, 1 ash removing port and an exhaust port are arranged, the exhaust port is arranged at the second section close to the die head, the ash removing port is arranged at the fourth section close to the die head, a vacuum pump is additionally arranged at the exhaust port, the vacuum pumping pressure of the vacuum pump is-950 mbar, the temperature of a machine barrel is set, the temperature of the first section is 80 ℃, the temperature of the second section is 260 ℃, the temperature of the sixth section is 250 ℃, the temperature of the seventh section is 200 ℃, the temperature of the eighth section is 180 ℃, the temperature of the ninth section is 160 ℃, and the mixture in the step 1) is fed into the feeding port after the temperature is constant for 30 minutes.
4) And (6) traction and granulation.
5) Observing the discharging condition of the die head, gradually increasing the rotating speed of the extruder to 300rpm, and correspondingly adjusting the conditions such as feeding load and the like.
6) After stabilization for 10min, samples were taken.
7) During the operation, the inspection and adjustment are paid attention to according to the operation specification, and the relevant indexes are sampled and tested.
Comparative example 1
The other steps were identical to those of example 1 except that no soapberry fruit extract was added.
Example 2
1) Adding 92.5 parts of polypropylene, 204 parts of degrading agent 301-.
2) The replacement and arrangement of the thread elements of the double-screw extruder are completed as required, the thread elements are determined to be intact, no teeth are broken, the arrangement is correct, residues are cleaned up, the angle is correct, the connection between the elements is tight, and the occlusion is smooth.
3) The length-diameter ratio of the adopted double-screw extruder is 44D, the double-screw extruder comprises 12 sections, 1 feeding port, 1 ash removing port and an exhaust port are arranged, the exhaust port is arranged at the second section close to the die head, the ash removing port is arranged at the fourth section close to the die head, a vacuum pump is additionally arranged at the exhaust port, the vacuum pumping pressure of the vacuum pump is-950 mbar, the temperature of a machine barrel is set, the first section is 80 ℃, the second section is 210 ℃, the third section is 240 ℃, the fourth section is 270 ℃, the ninth section is 260 ℃, the tenth section is 240 ℃, the eleventh section is 180 ℃, and the mixture in the step 1) is fed into the feeding port after the temperature is constant for 30 minutes.
4) And (6) traction and granulation.
5) Observing the discharging condition of the die head, gradually increasing the rotating speed of the extruder to 300rpm, and correspondingly adjusting the conditions such as feeding load and the like.
And the feeding speed and other conditions.
6) After stabilization for 10min, samples were taken.
7) During the operation, the inspection and adjustment are paid attention to according to the operation specification, and the relevant indexes are sampled and tested.
Comparative example 2
Compared with example 2, except that no soapberry fruit extract was added, the other steps were identical.
Example 3
1) Adding 93 parts of polypropylene, 101-203.5 parts of degrading agent, 0.3 part of soapberry extract and 0.2 part of compound antioxidant into a premixer according to the mass parts for mixing for 20min, then adding 1.5 parts of distilled water into the premixer in a spraying manner for mixing for 5min, and finally adding the rest 1.5 parts of distilled water into the premixer in a spraying manner for mixing for 5 min.
2) The replacement and arrangement of the thread elements of the double-screw extruder are completed as required, the thread elements are determined to be intact, no teeth are broken, the arrangement is correct, residues are cleaned up, the angle is correct, the connection between the elements is tight, and the occlusion is smooth.
3) The length-diameter ratio of the adopted double-screw extruder is 44D, the double-screw extruder comprises 12 sections, 1 feeding port, 1 ash removing port and an exhaust port are arranged, the exhaust port is arranged at the second section close to the die head, the ash removing port is arranged at the fourth section close to the die head, a vacuum pump is additionally arranged at the exhaust port, the vacuum pumping pressure of the vacuum pump is-950 mbar, the temperature of a machine barrel is set, the temperature of the first section is 80 ℃, the temperature of the second section is 260 ℃, the temperature of the sixth section is 250 ℃, the temperature of the seventh section is 200 ℃, the temperature of the eighth section is 180 ℃, the temperature of the ninth section is 160 ℃, and the mixture in the step 1) is fed into the feeding port after the temperature is constant for 30 minutes.
4) And (6) traction and granulation.
5) Observing the discharging condition of the die head, gradually increasing the rotating speed of the extruder to 300rpm, and correspondingly adjusting the conditions such as feeding load and the like.
6) After stabilization for 10min, samples were taken.
7) During the operation, the inspection and adjustment are paid attention to according to the operation specification, and the relevant indexes are sampled and tested.
Comparative example 3
The other steps were identical to those of example 3 except that no soapberry fruit extract was added.
Example 4
1) Adding 93 parts of polypropylene, 301-203.5 parts of degrading agent, 0.3 part of soapberry extract and 0.2 part of compound antioxidant into a premixer according to the mass parts for mixing for 20min, then adding 1.5 parts of distilled water into the premixer in a spraying manner for mixing for 5min, and finally adding the rest 1.5 parts of distilled water into the premixer in a spraying manner for mixing for 5 min.
2) The replacement and arrangement of the thread elements of the double-screw extruder are completed as required, the thread elements are determined to be intact, no teeth are broken, the arrangement is correct, residues are cleaned up, the angle is correct, the connection between the elements is tight, and the occlusion is smooth.
3) The length-diameter ratio of the adopted double-screw extruder is 44D, the double-screw extruder comprises 12 sections, 1 feeding port, 1 ash removing port and an exhaust port are arranged, the exhaust port is arranged at the second section close to the die head, the ash removing port is arranged at the fourth section close to the die head, a vacuum pump is additionally arranged at the exhaust port, the vacuum pumping pressure of the vacuum pump is-950 mbar, the temperature of a machine barrel is set, the first section is 80 ℃, the second section is 210 ℃, the third section is 240 ℃, the fourth section is 270 ℃, the ninth section is 260 ℃, the tenth section is 240 ℃, the eleventh section is 180 ℃, and the mixture in the step 1) is fed into the feeding port after the temperature is constant for 30 minutes.
4) And (6) traction and granulation.
5) Observing the discharging condition of the die head, gradually increasing the rotating speed of the extruder to 300rpm, and correspondingly adjusting the conditions such as feeding load and the like.
6) After stabilization for 10min, samples were taken.
7) During the operation, the inspection and adjustment are paid attention to according to the operation specification, and the relevant indexes are sampled and tested.
Comparative example 4
The other steps were identical to those of example 4 except that no soapberry fruit extract was added.
Example 5
1) Adding 93.5 parts of polypropylene, 203 parts of degrading agent 101-.
2) The replacement and arrangement of the thread elements of the double-screw extruder are completed as required, the thread elements are determined to be intact, no teeth are broken, the arrangement is correct, residues are cleaned up, the angle is correct, the connection between the elements is tight, and the occlusion is smooth.
3) The length-diameter ratio of the adopted double-screw extruder is 44D, the double-screw extruder comprises 12 sections, 1 feeding port, 1 ash removing port and an exhaust port are arranged, the exhaust port is arranged at the second section close to the die head, the ash removing port is arranged at the fourth section close to the die head, a vacuum pump is additionally arranged at the exhaust port, the vacuum pumping pressure of the vacuum pump is-950 mbar, the temperature of a machine barrel is set, the temperature of the first section is 80 ℃, the temperature of the second section is 260 ℃, the temperature of the sixth section is 250 ℃, the temperature of the seventh section is 200 ℃, the temperature of the eighth section is 180 ℃, the temperature of the ninth section is 160 ℃, and the mixture in the step 1) is fed into the feeding port after the temperature is constant for 30 minutes.
4) And (6) traction and granulation.
5) Observing the discharging condition of the die head, gradually increasing the rotating speed of the extruder to 300rpm, and correspondingly adjusting the conditions such as feeding load and the like.
6) After stabilization for 10min, samples were taken.
7) During the operation, the inspection and adjustment are paid attention to according to the operation specification, and the relevant indexes are sampled and tested.
Comparative example 5
The other steps were identical to those of example 5 except that no soapberry fruit extract was added.
Example 6
1) Adding 93.5 parts of polypropylene, 203 parts of degrading agent 301-.
2) The replacement and arrangement of the thread elements of the double-screw extruder are completed as required, the thread elements are determined to be intact, no teeth are broken, the arrangement is correct, residues are cleaned up, the angle is correct, the connection between the elements is tight, and the occlusion is smooth.
3) The length-diameter ratio of the adopted double-screw extruder is 44D, the double-screw extruder comprises 12 sections, 1 feeding port, 1 ash removing port and an exhaust port are arranged, the exhaust port is arranged at the second section close to the die head, the ash removing port is arranged at the fourth section close to the die head, a vacuum pump is additionally arranged at the exhaust port, the vacuum pumping pressure of the vacuum pump is-950 mbar, the temperature of a machine barrel is set, the first section is 80 ℃, the second section is 210 ℃, the third section is 240 ℃, the fourth section is 270 ℃, the ninth section is 260 ℃, the tenth section is 240 ℃, the eleventh section is 180 ℃, and the mixture in the step 1) is fed into the feeding port after the temperature is constant for 30 minutes.
4) And (6) traction and granulation.
5) Observing the discharging condition of the die head, gradually increasing the rotating speed of the extruder to 300rpm, and correspondingly adjusting the conditions such as feeding load and the like.
6) After stabilization for 10min, samples were taken.
Comparative example 6
Compared with example 6, except that no soapberry fruit extract was added, the other steps were identical.
Table 1 performance index testing of products prepared in examples and comparative examples
As can be seen from Table 1, the addition of the natural surfactant, soapberry fruit extract, significantly improved the odor rating of the high index polypropylene, and the pentaphenyltrialdehyde and TVOC content was further tested by the pouch method for example 3 and comparative example 3, below.
The testing steps are as follows: 10g of the sample was placed in a 10L Tedlar sampling bag and 5L of nitrogen was charged. And (3) placing the sampling bag filled with the sample in an oven at 65 ℃, and accelerating the emission rate of volatile organic compounds in the sample piece through high temperature. After the sample is placed for 2 hours, the gas in the bag is collected through a Tenax TA adsorption tube (used for collecting volatile organic compounds including benzene series) and a DNPH adsorption small tube (used for collecting aldehyde ketone substances), and then the organic matters released by the sample are qualitatively and quantitatively analyzed. The sampling device is shown in figure 1.
Volatile Organic Compounds (VOCs): after volatile organic compounds in air in the bag are collected by a Tenax TA adsorption tube, the volatile organic compounds are analyzed by a thermal desorption-gas chromatography mass spectrometer (TD-GCMS), and qualitative and quantitative external standard methods are carried out by comparing with a standard mass spectrogram of a target object to be detected and retaining time.
Aldehyde ketone substances: collecting aldehyde ketone substances in the air in the bag by using a DNPH adsorption tubule, eluting by using acetonitrile, detecting by using a diode array detector (HPLC-DAD) of a high performance liquid chromatograph, and carrying out qualitative retention time and quantitative peak area.
Example 3 the sample test results are shown in table 2:
TABLE 2
Comparative example 3 the results of the sample testing are shown in table 3:
TABLE 3
As can be seen from tables 2 and 3, the pentabenzenetriol and TVOC contents of the sample of example 3 are lower than those of the sample of comparative example 3, and it is further verified that the addition of the natural surfactant, soapberry fruit extract, can significantly improve the odor grade of the high-index polypropylene.
The preferred embodiments of the present invention described above are only for illustrating the present invention and are not to be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present application shall fall within the scope of the present invention without creative efforts.
Claims (10)
1. A preparation method of high-melt-index polypropylene with low ash content, low odor and narrow molecular weight distribution is characterized by comprising the following steps:
1) adding 92-97 parts of polypropylene, 1-4 parts of degrading agent, 1-5 parts of distilled water, 0.1-0.5 part of soapberry extract and 0.08-0.2 part of compound antioxidant into a pre-mixer according to the mass parts for mixing;
2) and (2) feeding the mixture obtained in the step (1) through a feed inlet of a double-screw extruder, and carrying out traction and granulation to obtain the high-melt-index polypropylene material.
2. The preparation method according to claim 1, wherein the mixing in the step 1) comprises the following specific steps: adding polypropylene, a degrading agent, a soapberry extract and a compound antioxidant into a premixer for mixing for 20min, then adding half of distilled water into the premixer in a spraying manner for mixing for 5min, and finally adding the rest of distilled water into the premixer in a spraying manner for mixing for 5 min.
3. The preparation method according to claim 1 or 2, characterized in that in the mixing operation of step 1), the temperature in the charging barrel is not too high, the temperature is not more than 50 ℃, and if the temperature is too high, the mixing is carried out after the temperature is reduced.
4. The preparation method according to claim 1, wherein the polypropylene is homo-polypropylene or co-polypropylene or a mixture thereof, and the melt index of the polypropylene is in a range of 2-5 g/10 min.
5. The method according to claim 1, wherein the degradation agent is a peroxide initiator.
6. The preparation method according to claim 1 or 5, wherein the degradation agent comprises one or more of di-tert-butyl peroxide, dicumyl peroxide, 2, 5-dimethyl-2, 5-di-tert-butyl hexane peroxide, 3,6, 9-triethyl-3, 6, 9-trimethyl-1, 4, 7-triperoxonane and benzoyl peroxide.
7. The method of claim 1, wherein the soapberry fruit extract contains 40wt% of soapberry saponin.
8. The preparation method according to claim 1, wherein the compound antioxidant is a polypropylene melt-blown compound agent produced by Beijing Jihaichuan scientific and technological development Limited, and the type is JHC 7547.
9. The method of claim 1, wherein the twin-screw extruder has an aspect ratio of 44: 1, including 12 sections, be equipped with 1 charge door, 1 deashing mouth and an exhaust port, the exhaust port is in the second section that is close to the die head, and the deashing mouth is in the fourth section that is close to the die head, and exhaust port department adds a evacuation pump to better faster take out the volatile.
10. The preparation method of claim 9, wherein the pressure of the vacuum pump is controlled to be-900 to-980 mbar, and the processing temperature of the double-screw extruder is 80 to 280 ℃; the rotation speed is 300-450 rpm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115403855A (en) * | 2022-09-01 | 2022-11-29 | 中化泉州能源科技有限责任公司 | Low-odor high-melt-index thin-wall injection molding polypropylene and preparation method thereof |
| CN115403855B (en) * | 2022-09-01 | 2024-04-05 | 中化泉州能源科技有限责任公司 | Low-odor high-melt-index thin-wall injection polypropylene and preparation method thereof |
| CN115947978A (en) * | 2022-12-13 | 2023-04-11 | 江苏极易新材料有限公司 | Compounding agent granulation method with melt finger control for polyolefin |
| CN116589792A (en) * | 2023-06-02 | 2023-08-15 | 立达超微科技(安徽青阳)有限公司 | Preparation method of melt-blown polypropylene and melt-blown polypropylene prepared by same |
| CN116693978A (en) * | 2023-06-21 | 2023-09-05 | 江西亚美达环保再生资源股份有限公司 | Woven bag produced by high-melt-index polypropylene reclaimed materials and preparation method thereof |
| CN116693978B (en) * | 2023-06-21 | 2024-04-30 | 江西亚美达环保再生资源股份有限公司 | Woven bag produced by high-melt-index polypropylene reclaimed materials and preparation method thereof |
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