CN111533994B - High-cracking-rate high-melt-index polypropylene material and preparation method and application thereof - Google Patents
High-cracking-rate high-melt-index polypropylene material and preparation method and application thereof Download PDFInfo
- Publication number
- CN111533994B CN111533994B CN202010385948.9A CN202010385948A CN111533994B CN 111533994 B CN111533994 B CN 111533994B CN 202010385948 A CN202010385948 A CN 202010385948A CN 111533994 B CN111533994 B CN 111533994B
- Authority
- CN
- China
- Prior art keywords
- melt
- polypropylene
- tert
- cracking
- molecular weight
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/13—Phenols; Phenolates
- C08K5/134—Phenols containing ester groups
- C08K5/1345—Carboxylic esters of phenolcarboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/14—Peroxides
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/49—Phosphorus-containing compounds
- C08K5/51—Phosphorus bound to oxygen
- C08K5/52—Phosphorus bound to oxygen only
- C08K5/524—Esters of phosphorous acids, e.g. of H3PO3
- C08K5/526—Esters of phosphorous acids, e.g. of H3PO3 with hydroxyaryl compounds
-
- 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
- D01F1/10—Other agents for modifying properties
-
- 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
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4282—Addition polymers
- D04H1/4291—Olefin series
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/12—Applications used for fibers
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Textile Engineering (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The invention discloses a high-cracking-rate high-melt-index polypropylene material and a preparation method and application thereof, wherein the high-cracking-rate high-melt-index polypropylene material comprises the following components in parts by weight: 100 parts of homopolymerized polypropylene; 0.4-8 parts of a molecular weight regulator; 0.1-1 part of stabilizer. The special material for melt-blown polypropylene with high cracking rate and high melt index is obtained by mixing the homopolymerized polypropylene, the molecular weight regulator and the stabilizer in proportion, extruding by using double screws, adjusting the rotating speed of the screws and improving the extrusion temperature.
Description
Technical Field
The invention relates to a high-cracking-rate high-melt-index polypropylene material, and a preparation method and application thereof, belonging to the technical field of materials.
Background
The polypropylene melt-blown non-woven fabric takes polypropylene as a raw material, the diameter of the fiber reaches 1-5 microns, the number and the surface area of the fiber in unit area are increased by the superfine fiber structure of the non-woven fabric, and meanwhile, the melt-blown fabric has good filtering property, heat insulation property and oil absorption property due to the fine fiber diameter and high porosity. After electret treatment, the melt-blown cloth can effectively adsorb particles and bacteria in the air, prevent virus infection to people, and can be widely applied to materials such as mask inner layers, filter elements and the like.
The special material for polypropylene melt-blown mainly takes polypropylene as a raw material, and the fluidity and the molecular weight distribution of the material are controlled by adding a molecular weight regulator, namely peroxide for reaction and degradation. The melt index of the special material for melt-blown polypropylene can be between 400-2000g/10min according to the use requirements of downstream customers. The product needs to simultaneously meet the characteristics of stable melt index, narrow molecular weight distribution, low ash content, small smell, high spinnability and the like. A large amount of molecular weight regulator is used in the production process of melt-blown polypropylene, and the molecular weight regulator in the melt-blown polypropylene material has large residue, large melt index volatility, high ash content and large peculiar smell due to immature production process, so that the melt-blown polypropylene material is difficult to accept by downstream customers.
Half-life is an indication of the rate of decomposition of the reaction. The molecular weight regulator generates free radicals after being heated, and the higher the temperature is, the more the generated free radicals are, the shorter the half-life period is, and the faster the reaction rate is. Meanwhile, the time for adding the material from the feeding port to the die port for extruding is the retention time of the material in the screw, and the retention time is related to the length-diameter ratio of the screw, the rotating speed and the long and short backflow of the mixing section. Generally, the longer the length-diameter ratio of the screw and the slower the rotation speed, the longer the residence time of the polypropylene material, the molecular weight regulator can fully contact and react with the polypropylene, and the final product contains little or no molecular weight regulator. The data show that the molecular weight regulator can be completely decomposed only when the residence time in the screw is more than 10 times of the half-life period at the temperature, and the polypropylene material can not contain the molecular weight regulator in the later processing.
Cracking Efficiency (CE) refers to the complete degree of reaction Cracking of peroxide in the process of extruding and granulating polypropylene, and the calculation formula is as follows:
and the MFR of the PP material without the influence of residual peroxide is measured by adding excessive antioxidant to neutralize various oxides in the PP material in the test process, so that the MFR of the PP product is not influenced.
When the cracking rate CE is higher, the residual amount of peroxide in the polypropylene material after reaction is smaller, the fluctuation of the melt index is smaller, and the product smell is lower; when CE is smaller, the residual quantity of the peroxide is larger, the fluctuation of the melt index is larger, and the odor of the product is larger.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide a high-cracking-rate high-melt-index polypropylene material, a preparation method and application thereof, which are suitable for melt-blown non-woven fabric polypropylene special material.
In order to achieve the above object, the present invention adopts the following technical solutions:
in a first aspect, a high-cracking-rate high-melt-index polypropylene material is provided, and raw materials comprise the following components in parts by weight:
100 parts of homopolymerized polypropylene;
0.4-8 parts of a molecular weight regulator;
0.1-1 part of stabilizer.
In some embodiments, the homopolypropylene has a melt index of 2 to 65g/10 min.
In some embodiments, the molecular weight regulator is an organic peroxide degrader masterbatch selected from one or more of 2, 5-dimethyl-2, 5-di-tert-butylperoxyhexane, di-tert-butylperoxycumene, 2, 5-dimethyl-2, 5-di-tert-butylperoxy-3-hexene, 3,6, 9-triethyl-3, 6, 9-trimethyl-1, 4, 7-triperoxononane, dilauryl phosphate, di-tert-butyl hydroperoxide, 1, 1-di-tert-butylperoxycyclohexane, 1, 1-bis (tert-butylperoxy) -3,3, 5-trimethylcyclohexane degradation masterbatch.
In some embodiments, the stabilizer is selected from one or more of pentaerythritol tetrakis [ β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], 1,3, 5-trimethyl-2, 4, 6-tris (3, 5-di-tert-butyl-4-hydroxybenzyl) benzene, octadecyl β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, 1,3, 5-tris (3, 5-di-tert-butyl-4-hydroxybenzyl) isocyanurate, tris (2, 4-di-tert-butylphenyl) phosphite, 1,3, 5-tris (3, 5-di-tert-butyl-4-hydroxybenzyl) isocyanurate.
More preferably, the stabilizer is a mixture of pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] and tris (2, 4-di-tert-butylphenyl) phosphite in a mass ratio of 1:0.5 to 1: 1.
In a second aspect, a method for preparing the high-cracking-rate high-melt-index polypropylene material is provided, which comprises:
(1) uniformly mixing homo-polypropylene, a molecular weight regulator and a stabilizer in a high-speed mixer according to a proportion to obtain a mixture;
(2) and (2) feeding the mixture obtained in the step (1) through a main feeding port of a double-screw extruder, and granulating by using a water tank cooling granulator to obtain the granular high-cracking-rate high-melt-index polypropylene material.
In some embodiments, the twin screw extruder has a length to diameter ratio of (32-70): 1; the temperature of each section of the double-screw extruder is set to be 165-300 ℃; the screw rotating speed of the double-screw extruder is set to be 50-400 rpm/min.
More preferably, the twin-screw extruder has a length to diameter ratio of (32-45): 1; the temperature of each section of the double-screw extruder is set to be 185-265 ℃; the screw rotating speed of the double-screw extruder is set to be 50-180 rpm/min.
The high-cracking-rate high-melt-index polypropylene material is prepared by the preparation method of the high-cracking-rate high-melt-index polypropylene material.
In a third aspect, there is provided the use of a high melt fraction, high melt index polypropylene material as described above for the production of melt blown nonwoven fabrics.
The invention has the beneficial effects that: the invention provides a special material for high-cracking-rate high-melt-index polypropylene, which is suitable for melt-blown non-woven fabrics.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
The auxiliary raw materials used in the examples are commercially available without specific reference.
Wherein the polypropylene material is polypropylene Y381H from Tohua energy (Zhang Jia hong) GmbH, and has a melt index of 36.76g/10 min;
the molecular weight regulator is solid degrading agent Enox101-20PP of Jiangsu Qiangsheng functional chemical company Limited;
the stabilizer is a mixture of pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] and tris (2, 4-di-tert-butylphenyl) phosphite in a ratio of 1: 0.9;
the manufacturing equipment of the special material for melt-blown selects a HK36 model of Nanjing Kogya chemical engineering complete equipment Limited, and the length-diameter ratio L/D of a screw is 40: 1.
Example 1
A high-cracking-rate high-melt-index polypropylene material comprises the following components:
in order to realize the development of the special material for the high-cracking-rate high-melt-index melt-blown polypropylene, the invention adopts the following technical process route:
(1) the polypropylene, the molecular weight regulator and the stabilizer are mixed uniformly in a high-speed mixer according to the proportion to obtain a mixture.
(2) And (2) feeding the mixture obtained in the step (1) through a main feeding port of a double-screw extruder, adjusting the rotating speed and the extrusion temperature of the extruder, and cooling by a water tank and granulating by a granulator to obtain the granular modified polypropylene material.
Relevant process parameters for examples 1-6 and comparative examples 1-3 in formulation weighing and extrusion granulation are given in table 1 below.
TABLE 1
The performance tests were performed according to the following criteria:
the melt flow rate (MFR value) of the sample was measured according to the method B of GB/T3682-2000 standard at 230 ℃ under a load of 2.16kg and at a melt density of 0.7386g/cm3。
The volatile component of the product is tested according to the method A specified by GB/T2914-2008 standard, and the test temperature is 110 +/-2 ℃.
The ash content of the product is carried out according to a method A specified by GB/T9345.1-2008 standard, a direct calcination method is adopted, and the calcination temperature is 850 +/-50 ℃.
The molecular mass distribution index Mw/Mn, as determined in accordance with ISO 16014-4:2012, was determined using trichlorobenzene as solvent at a flow rate of 1ml/min and a column temperature of 150 ℃.
The yellow index is tested according to HG/T3862-2006 standard.
Odor test, according to VDA270 standard.
The cracking rate, CE, MFR of the PP material measured without the influence of residual peroxide, is the MFR of the mixture measured by mixing the excess antioxidant with the polypropylene particles before the test. Excess antioxidant reacts with the oxide during the test, ensuring that the product MFR is not affected by the oxide.
Examples 1-6 and comparative examples 1-3 were tested according to the test methods described above, and the test results are shown in Table 2 below.
TABLE 2
Remarking: odor grade, 1 no odor; 2 slight peculiar smell; 3 has a taste, but is not irritating; 4 has strong odor; 5 a strong stimulating gas; 6 intolerable taste.
As can be seen from Table 2, examples 1 to 6 had a small amount of residual peroxide, a high cracking rate and a slight odor. Comparative example 1 the screw speed in the extrusion process was increased, resulting in short residence time of the material in the screw, incomplete reaction, more peroxide residue, low cracking efficiency, and a taste of the particles; comparative example 2 reduces the extrusion temperature, makes the peroxide half-life time longer, the reaction slow, makes the peroxide residue large, the cracking efficiency low, the granule has strong smell; comparative example 3 increased screw speed and reduced extrusion temperature, resulting in more peroxide residue, low cracking efficiency, and odorous pellets.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.
Claims (3)
1. The polypropylene material with high cracking rate and high melt index is characterized by comprising the following components in parts by weight:
100 parts of homopolymerized polypropylene;
0.4-8 parts of a molecular weight regulator;
0.1-1 part of a stabilizer;
the polypropylene homopolymer is polypropylene Y381H from Towa energy (Zhang Home) Limited company and has a melt index of 36.76g/10 min;
the molecular weight regulator is organic peroxide degradation agent master batch selected from 2, 5-dimethyl-2, 5-di-tert-butyl hexane peroxide degradation master batch, and the content of 2, 5-dimethyl-2, 5-di-tert-butyl hexane peroxide in the molecular weight regulator is 16.40-20.40 wt%;
the stabilizer is a mixture of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester and tri (2, 4-di-tert-butylphenyl) phosphite in a mass ratio of 1: 0.5-1: 1;
the preparation method comprises the following steps:
(1) uniformly mixing homo-polypropylene, a molecular weight regulator and a stabilizer in a high-speed mixer according to a proportion to obtain a mixture;
(2) feeding the mixture obtained in the step (1) through a main feeding port of a double-screw extruder, and granulating by a water tank cooling granulator to obtain a granular polypropylene material with high cracking rate and high melt index; the length-diameter ratio of the double-screw extruder is 40: 1; the temperature of each section of the double-screw extruder is set to be 185-265 ℃; the screw rotation speed of the twin-screw extruder was set to 80 rpm/min.
2. The high-cracking-rate high-melt-index polypropylene material as claimed in claim 1, wherein the stabilizer is a mixture of pentaerythritol tetrakis [ β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] and tris (2, 4-di-tert-butylphenyl) phosphite in a mass ratio of 1: 0.9.
3. Use of a high melt fraction high melt index polypropylene material according to any one of claims 1 to 2 for the production of melt blown nonwovens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010385948.9A CN111533994B (en) | 2020-05-09 | 2020-05-09 | High-cracking-rate high-melt-index polypropylene material and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010385948.9A CN111533994B (en) | 2020-05-09 | 2020-05-09 | High-cracking-rate high-melt-index polypropylene material and preparation method and application thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111533994A CN111533994A (en) | 2020-08-14 |
| CN111533994B true CN111533994B (en) | 2021-09-17 |
Family
ID=71972003
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010385948.9A Active CN111533994B (en) | 2020-05-09 | 2020-05-09 | High-cracking-rate high-melt-index polypropylene material and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111533994B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114437263B (en) * | 2020-10-20 | 2023-12-08 | 中国石油化工股份有限公司 | Low-VOC low-odor polypropylene resin and preparation method and application thereof |
| CN112480528A (en) * | 2020-10-22 | 2021-03-12 | 中广核俊尔（上海）新材料有限公司 | Low-odor polypropylene material with ultra-high melt index and preparation method thereof |
| CN112662063A (en) * | 2020-12-21 | 2021-04-16 | 汕头市格派环保科技有限公司 | PP melt-blown material and preparation method thereof |
| CN112778636B (en) * | 2020-12-28 | 2022-10-04 | 金发科技股份有限公司 | Melt-blown polypropylene material, preparation method and application |
| CN114292464B (en) * | 2021-11-24 | 2023-06-02 | 富海(东营)新材料科技有限公司 | Method for producing high-flow polypropylene by using reactive extrusion equipment |
| CN113912945B (en) * | 2021-12-08 | 2023-06-16 | 中化泉州能源科技有限责任公司 | Low ash low odor narrow molecular weight distribution high melt index polypropylene and preparation method thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT403581B (en) * | 1993-06-07 | 1998-03-25 | Danubia Petrochem Polymere | METHOD FOR PRODUCING NEW POLYPROPYLENE BY CHEMICAL DEGRADING |
| CN1217989C (en) * | 2003-05-09 | 2005-09-07 | 东华大学 | Superhigh melt index polypropene and preparing process thereof |
| CN102675732B (en) * | 2011-03-10 | 2014-04-09 | 北京伊士通新材料发展有限公司 | Polypropylene mixture, and preparation method and application thereof |
| CN103571039B (en) * | 2012-07-20 | 2015-10-07 | 中国石油化工股份有限公司 | High melting means polypropene composition and preparation method thereof |
| ES2972402T3 (en) * | 2015-02-10 | 2024-06-12 | Lummus Novolen Technology Gmbh | Procedures to modify the rheology of polymers |
| CN109354770A (en) * | 2018-10-25 | 2019-02-19 | 中国石油化工股份有限公司 | A kind of non-woven cloth acrylic resin and preparation method thereof |
-
2020
- 2020-05-09 CN CN202010385948.9A patent/CN111533994B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN111533994A (en) | 2020-08-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111533994B (en) | High-cracking-rate high-melt-index polypropylene material and preparation method and application thereof | |
| CN111205563B (en) | Melt-blown polypropylene and preparation method and application thereof | |
| CN111484678B (en) | Electret master batch for melt-blown non-woven fabric for low-resistance mask and preparation method thereof | |
| CN111560140B (en) | Special organic electret master batch for melt-blown non-woven fabric for mask, preparation method of master batch and melt-blown non-woven fabric prepared from master batch | |
| CN113121914B (en) | Melt-blown polypropylene material and preparation method and application thereof | |
| CN111875886B (en) | Polypropylene electret master batch, preparation method thereof and polypropylene melt-blown non-woven fabric | |
| CN111499979B (en) | Melt-blown polypropylene composition and preparation method and application thereof | |
| CN111849074A (en) | Electret master batch and preparation method and application thereof | |
| CN111533995A (en) | Melt-blown nonwoven material with electret effect and preparation method thereof | |
| CN111533991A (en) | Polypropylene melt-blown material master batch, polypropylene melt-blown material and preparation methods of polypropylene melt-blown material master batch and polypropylene melt-blown material | |
| CN111300680B (en) | Equipment and method for preparing ultralong anti-aging melt-blown polypropylene material and material obtained by equipment and method | |
| CN112300485A (en) | Special ultrahigh-fluidity polypropylene material for melt-blowing and preparation method thereof | |
| CN112812429A (en) | Melt-blown polypropylene material composition and preparation method thereof | |
| WO2023274190A1 (en) | Melt-blown polypropylene composition, method for improving strength of melt-blown polypropylene composition, and application of melt-blown polypropylene composition | |
| DE69605315T2 (en) | METHOD FOR PRODUCING SILANE CROSSLINKED POLYOLEFINES | |
| CN112662061B (en) | Low-shrinkage modified polypropylene resin and preparation method and application thereof | |
| EP2670797A1 (en) | Peroxide blends for cross-linking ethylene vinyl acetate in an accelerated manner | |
| CN106317582A (en) | Polyethylene masterbatch with pumice powder as opening agent and preparation method thereof | |
| CN115572441A (en) | High-melt-index polybutylene-1 melt-blown material and preparation method thereof | |
| CN114044973A (en) | Radiation-resistant PP electret melt-blown material and preparation process thereof | |
| US3932323A (en) | Selective addition of additives to solid polymer | |
| CN112662063A (en) | PP melt-blown material and preparation method thereof | |
| CN112481726A (en) | Melt-blown polypropylene with long-acting filtering function and preparation method and application thereof | |
| CN113683834A (en) | Melt-blown hydrophilic master batch and preparation method thereof | |
| CN112831118B (en) | Polypropylene melt-blown material toughening master batch and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |