CN111548566B - Melt-blown polypropylene material and preparation method and application thereof - Google Patents
Melt-blown polypropylene material and preparation method and application thereof Download PDFInfo
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- CN111548566B CN111548566B CN202010666551.7A CN202010666551A CN111548566B CN 111548566 B CN111548566 B CN 111548566B CN 202010666551 A CN202010666551 A CN 202010666551A CN 111548566 B CN111548566 B CN 111548566B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/08—Filter cloth, i.e. woven, knitted or interlaced material
- B01D39/083—Filter cloth, i.e. woven, knitted or interlaced material of organic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0001—Making filtering elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
- B01D46/0028—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions provided with antibacterial or antifungal means
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
- C08J3/226—Compounding polymers with additives, e.g. colouring using masterbatch techniques using a polymer as a carrier
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- 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
- D04H1/54—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 by welding together the fibres, e.g. by partially melting or dissolving
- D04H1/56—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 by welding together the fibres, e.g. by partially melting or dissolving in association with fibre formation, e.g. immediately following extrusion of staple fibres
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/10—Homopolymers or copolymers of propene
- C08J2423/12—Polypropene
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- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0806—Silver
-
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
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- 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
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
Abstract
The invention discloses a melt-blown polypropylene material and a preparation method and application thereof, wherein the melt-blown polypropylene material comprises the following components: 65-80 parts of melt-blown polypropylene, 20-35 parts of low-isotacticity polypropylene and 2-3 parts of stearate. According to the invention, the low isotacticity polypropylene LMPP and the melt-blown polypropylene are blended, so that the hand feeling of the melt-blown non-woven fabric can be effectively improved, the prepared melt-blown non-woven fabric has soft hand feeling, has the advantages of high strength, high toughness and the like, and meanwhile, the particle filtration efficiency and air permeability of the melt-blown non-woven fabric can be improved, and the material has a wide application prospect in preparation of high-filtration and low-resistance female/child masks which are required to be perfectly attached to the face.
Description
Technical Field
The invention belongs to the field of high polymer materials, and particularly relates to a melt-blown polypropylene material, and a preparation method and application thereof.
Background
The melt-blown non-woven fabric is a key filtering material in products such as disposable medical surgical masks, medical N95 masks and the like, and is mainly prepared by taking polypropylene as a raw material through the processes of feeding, melt extrusion, fiber formation, fiber cooling, web formation, cloth reinforcement and the like. The diameter of the fiber formed by melt-blown spinning can reach 1-5 microns, the fiber has many gaps, a fluffy structure and good wrinkle resistance, and the number and the surface area of the fiber in unit area are increased by the superfine fibers with unique capillary structures, so that the melt-blown non-woven fabric has good filterability, shielding property, heat insulation property and oil absorption property. Can be used in the fields of air and liquid filtering materials, isolating materials, absorbing materials, mask materials, warm-keeping materials, oil absorbing materials, wiping cloth and the like.
However, in the process of preparing the melt-blown non-woven fabric by using the existing melt-blown polypropylene material, because the requirement on the particle filtration efficiency of the melt-blown non-woven fabric is high (the requirement of the BFE of the disposable medical surgical mask in the YY0469-2011 standard is more than 95%), the melt-blown non-woven fabric has the characteristics of hard handfeel and hard and brittle cloth cover while meeting the requirement on high-filtration efficiency melt-blown non-woven fabric, which causes the situation that the cloth cover of the mask prepared by the melt-blown non-woven fabric is broken in the wearing process, and the mask is difficult to effectively fit the face of a wearer. Moreover, for women and children, the problem is more serious because the face area is smaller, and the mask cannot play the role of blocking droplets, bacteria, aerogel and the like in the using process directly, so that the life health of people in the epidemic situation period is threatened. In view of this, there is a need in the market for a melt-blown polypropylene material that can produce melt-blown nonwoven fabrics with soft hand feel and low surface hardness.
Therefore, the research on the melt-blown polypropylene material with soft hand feeling has excellent industrial application prospect.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention firstly aims to provide the melt-blown polypropylene material with soft hand feeling, the melt-blown non-woven fabric prepared from the material has the advantages of soft hand feeling, high strength, high toughness and the like, and meanwhile, the particle filtration efficiency and the air permeability of the melt-blown non-woven fabric can be improved.
The invention also aims to provide a preparation method of the melt-blown polypropylene material.
The invention is realized by the following technical scheme:
the melt-blown polypropylene material comprises the following components in parts by weight:
65-80 parts of melt-blown polypropylene;
20-35 parts of low-isotacticity polypropylene;
2-3 parts of stearate.
The melt-blown polypropylene is high-fluidity polypropylene resin special for melt-blown non-woven fabrics, the melt index is 1400-1600 g/10min under the conditions of 230 ℃ and 2.16kg, the weight-average molecular weight is 12000-15000g/mol, and the molecular weight distribution index PDI is 2.5-3.5.
The larger the molecular weight of the melt blown polypropylene, the more small molecular substances are contained to meet the melt demand, thereby affecting the filtration efficiency of the melt blown polypropylene material, therefore, the weight average molecular weight of the melt blown polypropylene is preferably 12500-13500g/mol, and the molecular weight distribution index PDI is 2.8-3.2.
The low isotacticity polypropylene is polypropylene resin synthesized by metallocene catalysis, the melt index of the low isotacticity polypropylene is 600g/10min-900g/10min under the conditions of 230 ℃ and 2.16kg, and the average isotacticity m value is 24-50%. The polypropylene with low isotacticity has low crystallization property, and can slow the crystallization of the melt-blown polypropylene, so that the melt-blown non-woven fabric prepared has better soft hand feeling. The lower the average isotacticity of the low isotactic polypropylene, the higher the softness of the material, but the lower the average isotacticity, which affects the mechanical properties of the material, it is preferred that the average isotacticity m value of the low isotactic polypropylene is from 30% to 45%, from the comprehensive point of view.
The low isotacticity polypropylene of the present invention can be prepared by methods conventional in the art, and can also be obtained commercially.
According to the invention, through blending of a specific amount of low isotacticity polypropylene (LMPP) and melt-blown polypropylene, the hand feeling of the melt-blown non-woven fabric can be effectively improved, the prepared melt-blown non-woven fabric has excellent flexibility, and the particle filtration efficiency and air permeability of the melt-blown non-woven fabric can be improved simultaneously. If the low isotacticity polypropylene is added too much, on the one hand, the strength of the material is reduced, and on the other hand, the filtration efficiency of the melt-blown nonwoven particles is reduced.
The stearate is one or more selected from zinc stearate, calcium stearate, cobalt stearate, magnesium stearate and rare earth stearate. The stearate can effectively improve the crystallinity, alpha crystal phase proportion and grain size of the material, thereby improving the charge storage performance.
The invention also provides a preparation method of the melt-blown polypropylene material, which comprises the following steps:
after weighing the components in proportion, uniformly mixing the components through a high-speed mixer, then carrying out melt extrusion and granulation through a double-screw extruder at the temperature of 160-180 ℃, and drying to obtain the melt-blown polypropylene material.
The invention also provides application of the melt-blown polypropylene material in preparing air filter materials, liquid filter materials, isolating materials, absorbing materials, mask materials, warm-keeping materials or oil absorption materials.
Preferably, the melt-blown polypropylene material is used for preparing melt-blown non-woven fabrics. The melt-blown non-woven fabric prepared from the melt-blown polypropylene material has soft hand feeling, has the advantages of high strength, high toughness and the like, can improve the particle filtering efficiency and air permeability of the melt-blown non-woven fabric, and has wide application prospect in preparing high-filtering and low-resistance female/child masks which are required to be perfectly attached to the face.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, the low isotacticity polypropylene LMPP and the melt-blown polypropylene are blended, the elasticity of the low isotacticity polypropylene LMPP and the good compatibility of the low isotacticity polypropylene LMPP and the melt-blown polypropylene are utilized, the low isotacticity polypropylene has little influence on the apparent viscosity of the melt-blown polypropylene at different shearing rates, and the prepared PP/LMPP non-woven material has high strength and high flexibility, so that the mask has soft hand feeling, can be well attached to the face of a wearer, and can be widely applied to the fields of packaging and medical products.
(2) The low crystallization performance of the low isotacticity polypropylene LMPP has a diluting effect on the crystallization of the melt-blown polypropylene, so that the crystallization of the melt-blown polypropylene is slowed down and is more easily and fully drafted, the solidification position of spinning is moved to the downstream, neck-shaped deformation is also inhibited, and the spinnability is improved. And the fluctuation of the fiber diameter is reduced at high-speed spinning speed under the condition of cooling air, the fiber diameter is more uniform, and the prepared melt-blown non-woven fabric has smoother surface and more delicate hand feeling.
(3) The low isotacticity polypropylene LMPP provided by the invention can easily enter the amorphous phase of melt-blown polypropylene, so that the range of the amorphous phase region is increased, the interfaces between the amorphous region and the crystalline region are increased, and the increase of 'interface traps' for trapping charges in the electret treatment process is caused, so that the particle filtration efficiency of melt-blown non-woven fabrics under the same electret condition and the particle filtration efficiency after heat treatment at 70 ℃ for 24 hours are improved.
(4) In the melt-blown polypropylene material provided by the invention, the raw materials are common materials sold in the market, no special chemicals are used, the preparation process is simple and easy, the requirement on equipment is low, the comprehensive cost performance of the product is higher, the disposable medical/protective mask with excellent filtering performance can be prepared according to different purposes, and the melt-blown polypropylene material has an excellent industrial application prospect.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
The raw materials used in the examples and comparative examples are now described below, but are not limited to these materials:
melt blown polypropylene PP 1: the melt index is 1500g/10min (test condition 230 ℃/2.16 kg), the weight average molecular weight is 13000g/mol, and the molecular weight distribution index PDI is 2.8-3.2;
melt blown polypropylene PP 2: the melt index is 1500g/10min (test condition 230 ℃/2.16 kg), the weight average molecular weight is 14000g/mol, and the molecular weight distribution index PDI is 2.5-3.5;
melt blown polypropylene PP 3: the melt index is 1500g/10min (test condition 230 ℃/2.16 kg), the weight average molecular weight is 17000g/mol, and the molecular weight distribution index PDI is 2.0-4.0;
low isotacticity polypropylene LMPP 1: the melt index is 800g/10min (the test condition is 230 ℃/2.16 kg), the average isotacticity m value is 36 percent, and the material is sold in the market;
low isotacticity polypropylene LMPP 2: the melt index is 650g/10min (test condition 230 ℃/2.16 kg), the average isotacticity m value is 50%, and the alloy is commercially available;
polypropylene: the melt index is 800g/10min (test condition 230 ℃/2.16 kg), the average isotacticity m value is 99.9 percent, and the alloy is commercially available;
stearate salt: magnesium stearate, commercially available.
The relevant performance test criteria or methods are as follows:
gram weight test standard FZ/T60003;
the transverse/longitudinal breaking strength and elongation at break test standard FZ/T60005;
air Permeability test Standard GB/T5453-1997;
softness test Standard GB/T8942-2016;
particulate filtration efficiency test standard YY 0469-2011.
Examples and comparative examples:
weighing the components according to the proportion shown in the table 1, uniformly mixing the components through a high-speed mixer, then carrying out melt extrusion at 160-180 ℃ through a double-screw extruder, granulating, and drying to obtain the melt-blown polypropylene material;
melt-blown polypropylene granules prepared in the examples and comparative examples are added into a screw extruder to be melt and extruded, then enter a melt-blown die head through a material path and a metering pump, melt meets high-speed hot air at the outlet of the melt-blown die head, and is drawn and refined into fibers under the action of the high-speed hot air, then the fibers are randomly deposited on a net curtain to form melt-blown non-woven fabrics, then corona discharge electret treatment is carried out on the non-woven fabrics on line, the electret voltage is 30KV, the electret distance is 6cm, the polypropylene melt-blown non-woven fabrics can be prepared, and the test results of the melt-blown non-woven fabrics are listed in table.
TABLE 1 concrete compounding ratio and performance results (in parts by weight) of examples and comparative examples
TABLE 2 concrete compounding ratio and performance results (in parts by weight) of examples and comparative examples
As can be seen from table 2: compared with the embodiment, the invention has the advantages that the hand feeling of the melt-blown non-woven fabric can be effectively improved by adding the low-isotacticity polypropylene LMPP into the melt-blown polypropylene, the prepared melt-blown non-woven fabric has excellent softness, high strength and high toughness, and the particle filtration efficiency and the air permeability of the melt-blown non-woven fabric can be improved simultaneously. Comparing comparative example 2 with the examples, excessive addition of low isotacticity polypropylene LMPP, although its softness and elongation at break are significantly improved, its strength is decreased and the particle filtration efficiency is decreased. Comparing comparative example 3 with example 2, the addition of other common polypropylenes in comparative example 3 affects the stability of the melt-blown nonwoven fabric in the spinning process, and the prepared melt-blown nonwoven fabric has reduced mechanical properties, reduced particle filtration efficiency and poorer softness. As can be seen from the comparison between example 1 and comparative example 4, the melt-blown nonwoven fabric prepared by the invention has the best performance through optimizing the performance parameters of the melt-blown polypropylene.
Claims (5)
1. The melt-blown polypropylene material is characterized by comprising the following components in parts by weight:
65-80 parts of melt-blown polypropylene;
20-35 parts of low-isotacticity polypropylene;
2-3 parts of stearate;
the melt index of the melt-blown polypropylene is 1400g/10min-1600g/10min under the conditions of 230 ℃ and 2.16kg, the weight-average molecular weight is 12000-15000g/mol, and the molecular weight distribution index PDI is 2.5-3.5;
the low isotacticity polypropylene is polypropylene resin synthesized by metallocene catalysis, the melt index is 600g/10min-900g/10min under the conditions of 230 ℃ and 2.16kg, and the average isotacticity is 24% -36%;
the stearate is one or more selected from zinc stearate, calcium stearate, cobalt stearate, magnesium stearate and rare earth stearate.
2. The melt-blown polypropylene material according to claim 1, wherein the melt-blown polypropylene has a weight average molecular weight of 12500-13500g/mol and a molecular weight distribution index PDI of 2.8-3.2.
3. A method of producing a melt blown polypropylene material according to any one of claims 1 to 2, comprising the steps of:
after weighing the components in proportion, uniformly mixing the components through a high-speed mixer, then carrying out melt extrusion and granulation through a double-screw extruder at the temperature of 160-180 ℃, and drying to obtain the melt-blown polypropylene material.
4. Use of a melt-blown polypropylene material according to any one of claims 1 to 2 for the preparation of an air filter material, a liquid filter material, a barrier material, an absorbent material, a mask material, a thermal material or an oil absorbent material.
5. Use according to claim 4 for the preparation of melt-blown nonwovens.
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| CN112662061B (en) * | 2020-12-18 | 2022-12-06 | 广东金发科技有限公司 | Low-shrinkage modified polypropylene resin and preparation method and application thereof |
| CN112778637B (en) * | 2020-12-28 | 2022-08-19 | 广东金发科技有限公司 | Washable melt-blown polypropylene material and preparation method and application thereof |
| CN113244696B (en) * | 2021-05-13 | 2022-10-28 | 浙江圣蓝新材科技有限公司 | Melt-blown air filter material with uniform air permeability and production process thereof |
| CN114031854B (en) * | 2021-11-30 | 2023-05-02 | 金发科技股份有限公司 | Black melt-blown polypropylene composite material and preparation method and application thereof |
| CN114163734B (en) * | 2022-02-10 | 2022-05-10 | 广东烽业科技有限公司 | High-antibacterial polypropylene material and preparation method and application thereof |
| CN114737275A (en) * | 2022-03-30 | 2022-07-12 | 广东金发科技有限公司 | Melt-blown fiber electret material and preparation method and application thereof |
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| US20020037679A1 (en) * | 2000-08-01 | 2002-03-28 | Vishal Bansal | Meltblown web |
| WO2002016480A2 (en) * | 2000-08-22 | 2002-02-28 | Exxonmobil Chemical Patents Inc. | Polypropylene films |
| US6774069B2 (en) * | 2000-12-29 | 2004-08-10 | Kimberly-Clark Worldwide, Inc. | Hot-melt adhesive for non-woven elastic composite bonding |
| US20090053959A1 (en) * | 2007-08-21 | 2009-02-26 | Sudhin Datta | Soft and Elastic Nonwoven Polypropylene Compositions |
| CN105568564B (en) * | 2016-03-21 | 2018-05-01 | 林淑录 | A kind of polypropylene acoustical cotton and its preparation process |
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