CN112795097A - High-flexibility low-odor polypropylene material, preparation method thereof and application thereof in manufacturing melt-blown fabric - Google Patents
High-flexibility low-odor polypropylene material, preparation method thereof and application thereof in manufacturing melt-blown fabric Download PDFInfo
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- CN112795097A CN112795097A CN202110007970.4A CN202110007970A CN112795097A CN 112795097 A CN112795097 A CN 112795097A CN 202110007970 A CN202110007970 A CN 202110007970A CN 112795097 A CN112795097 A CN 112795097A
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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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- 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
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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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- 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
- D04H1/542—Adhesive fibres
- D04H1/544—Olefin series
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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
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Textile Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Artificial Filaments (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a high-flexibility low-odor polypropylene material, a preparation method thereof and application thereof in preparing melt-blown cloth. The polypropylene material comprises the following raw materials by weight part of 100: 87-96.7 parts of polypropylene, 0.2-1.0 part of degrading agent, 1-4 parts of adsorbent, 2-8 parts of softener and 0.1-0.4 part of antioxidant. The preparation method comprises the following steps: mixing polypropylene and an adsorbent, adding a degradation agent, a softener and an antioxidant in a dropwise manner under continuous stirring, adding the antioxidant into the mixture, uniformly premixing, adding the obtained material into an extruder for melt blending, and performing vacuum extrusion and granulation by the extruder to obtain the high-flexibility low-odor polypropylene material.
Description
Technical Field
The invention relates to the field of polypropylene materials, in particular to a high-flexibility low-odor polypropylene material, a preparation method thereof and application thereof in manufacturing melt-blown cloth.
Background
The disposable mask is used as important protective equipment, the main raw materials of the disposable mask are polypropylene melt-blown non-woven fabric and melt-blown cloth, and the melt-blown cloth is a core component of the mask with a filtering and protecting effect. The production process of the polypropylene melt-blown non-woven fabric comprises the following steps: the polypropylene melt-blown cloth is extruded and drawn by high-speed hot air, thereby forming superfine fibers, condensing the superfine fibers on a condensation net curtain or a roller, and forming the cloth by self-bonding.
The conventional polypropylene melt-blown fabric is obtained by adding tert-butyl peroxide into polypropylene homopolymerization powder for degradation (for example, the patent technology with the publication number of CN 111499978A). The conventional polypropylene powder is obtained by a degradation method, has a strong body odor, and is degraded by tert-butyl peroxide again, so that the odor is more unpleasant.
In addition, as the melt index (melt index) of the used conventional polypropylene powder is about 30g/10min (230 ℃, 2.16kg), and the melt index (230 ℃, 2.16kg) of 1500g/10min is reached, the addition amount of the peroxide is relatively high, and the high-content addition is easy to remain, so that the problems of peculiar smell, unstable spinning, crisp cloth and the like are caused.
In addition, the effect of melt-blown fabric is closely related to equipment, and when the conventional melt-blown material with the melt index of 1500g/10min (230 ℃, 2.16kg) is formed on a certain part of equipment, the problems of brittleness of a finished product and the like caused by poor toughness can also occur, and the debugging is difficult or even impossible to solve.
The patent specification with publication number CN 111533994A discloses a high-cracking-rate high-melt-index polypropylene material, a preparation method and application thereof, wherein the 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. The molecular weight regulator is organic peroxide degradation agent master batch, and can be selected from 3,6, 9-triethyl-3, 6, 9-trimethyl-1, 4, 7-triperoxonane. The stabilizer may be selected from the group consisting of antioxidant 1010 and the like. The patent technology can obtain a polypropylene material with lower odor and higher melt index, but the toughness of the material is not studied at all, and the effect of the stabilizer is not further researched. Moreover, according to the specific implementation mode of the patent technology, the technical scheme needs to add more molecular weight regulator (accounting for more than 1.2 percent of the mass of the homopolymerized polypropylene) to obtain the modified material with the melt index of more than 1000g/10 min.
Disclosure of Invention
Aiming at the technical problems and the defects existing in the field, the invention provides a high-flexibility low-odor polypropylene material, which adopts metallocene-catalyzed high-flow homopolymerized particle polypropylene to be matched with a specific peroxide degradation agent and an adsorbent to carry out stable degradation, and obtains a polypropylene melt-blown cloth with a melt-finger range of 1000-plus-2000 g/10min and stable melt-finger while successfully realizing the stable low-odor of the material. Meanwhile, a special softener is added in the formula, and the special softener and the adsorbent generate a synergistic toughening effect to endow the polypropylene melt-blown fabric with high flexibility and reduce equipment dependence, and a specific antioxidant system is adopted to reduce the loss of peroxide, change phases and reduce the usage amount of the peroxide and reduce the odor of the material. The high-flexibility low-odor polypropylene material is particularly suitable for manufacturing melt-blown cloth.
A high-flexibility low-odor polypropylene material comprises the following raw materials in parts by weight based on 100 parts of the total mass of the raw materials:
the degradation agent is 3,6, 9-triethyl-3, 6, 9-trimethyl-1, 4, 7-triperoxonane;
the adsorbent is a styrene elastomer;
the softener is metallocene polypropylene with the isotacticity of 50-65 percent;
the antioxidant comprises a main antioxidant and an auxiliary antioxidant, wherein the main antioxidant is 1,3, 5-tri (4-tert-butyl-3-hydroxy-2, 6-dimethylbenzyl) -1,3, 5-triazine-2, 4,6- (1H,3H,5H) -trione.
When the 3,6, 9-triethyl-3, 6, 9-trimethyl-1, 4, 7-triperoxonane degrading agent is used independently, the problems of volatilization, low utilization rate and unstable degradation in the melt extrusion process, unstable melt index of the obtained product, large difference, environmental pollution and the like generally exist, so that the problem that the using amount of the degrading agent needs to be greatly increased for obtaining a high-melt index polypropylene product is further caused, and the total volatilization amount of the degrading agent in unit time is increased by greatly increasing the degrading agent, so that the odor is large, the residual amount of peroxide in the material is increased, and the environmental pollution is increased. In order to solve the problems, the volatilization of a 3,6, 9-triethyl-3, 6, 9-trimethyl-1, 4, 7-triperoxonane degradation agent in the melt extrusion process is reduced, the degradation capability of the degradation agent is fully utilized, the degradation efficiency and stability are improved, the melt index stability of the obtained product is improved, and a product with a high melt index is obtained under the condition of low usage amount of the degradation agent. The use of lower degradants also results in a less odorous product.
The invention further discovers that the main antioxidant of the specific class has the minimum influence on the 3,6, 9-triethyl-3, 6, 9-trimethyl-1, 4, 7-triperoxonane degradation agent compared with other main antioxidants, the degradation capability of the degradation agent can be furthest exerted, and the melt index of the obtained product is higher under the same addition amount of the degradation agent.
Researches show that in the high-flexibility low-odor polypropylene material system, a styrene elastomer adsorbent and a metallocene polypropylene softener with isotacticity of 50-65% have a synergistic effect, and compared with a single component, the high-flexibility low-odor polypropylene material system can further remarkably improve the toughness of a product and the stability of a melt finger.
Preferably, the polypropylene is metallocene-catalyzed homo-polypropylene particles with the melt index of 60-150g/10min under the conditions of 230 ℃ and 2.16 kg. By adopting the metallocene-catalyzed high-fluidity homopolymerized polypropylene, the obtained product has smaller smell.
The secondary antioxidant may be a secondary antioxidant commonly used in the art. Preferably, the secondary antioxidant is a phosphite antioxidant and/or an ester antioxidant. More preferably, the secondary antioxidant is antioxidant 168.
Preferably, the mass ratio of the main antioxidant to the auxiliary antioxidant is 1-2: 1.
The high-flexibility low-odor polypropylene material has the advantages that the melt index can be 1000-2000g/10min at 230 ℃ under the condition of 2.16kg, and the high-flexibility low-odor polypropylene material has excellent toughness and low odor.
The invention also provides a preferable preparation method of the high-flexibility low-odor polypropylene material, which comprises the following steps: mixing polypropylene and an adsorbent, adding a degradation agent, a softener and an antioxidant in a dropwise manner under continuous stirring, adding the antioxidant into the mixture, uniformly premixing, adding the obtained material into an extruder for melt blending, and performing vacuum extrusion and granulation by the extruder to obtain the high-flexibility low-odor polypropylene material.
Preferably, the temperature of melt blending and vacuum extrusion of the extruder is 140-270 ℃, and the main machine rotating speed of the extruder is 400-600 rpm.
The invention also provides application of the high-flexibility low-odor polypropylene material in manufacturing melt-blown cloth.
Compared with the prior art, the invention has the main advantages that:
(1) the invention uses metallocene catalyzed homopolymerization polypropylene particles with 60-150g/10min of melt fingers to cooperate with 3,6, 9-triethyl-3, 6, 9-trimethyl-1, 4, 7-triperoxonane degradation agent, thereby avoiding the increase of odor of low-odor raw materials after passing the machine, solving the pain point of introducing unpleasant odor by using tert-butyl peroxide for degradation, and obtaining stable fluidity and low-odor effect.
(2) Aiming at a 3,6, 9-triethyl-3, 6, 9-trimethyl-1, 4, 7-triperoxononane degradation agent/polypropylene system, the invention creatively uses the styrene elastomer as the adsorbent, can quickly and effectively adsorb the 3,6, 9-triethyl-3, 6, 9-trimethyl-1, 4, 7-triperoxononane degradation agent, greatly reduces the volatilization of the degradation agent, ensures the actual addition amount of the degradation agent, greatly improves the stability of the product melt index, simultaneously increases the environmental safety and the environmental protection property, and has obvious effect. The improvement of the utilization rate of the degradation agent enables the product to obtain high melt index under the condition of low addition amount of the degradation agent, and the reduction of the addition amount of the degradation agent also enables the smell of the product to be reduced. Meanwhile, the invention discovers that the low-isotacticity metallocene polypropylene serving as a softener can form a synergistic effect with a styrene elastomer serving as an adsorbent, the elongation at break of a material body is increased by more than 30%, and the flexibility of the cloth is greatly increased.
(3) The non-woven fabric material formed by melt-blowing the polypropylene material has excellent low-odor property, flexibility and stability, and is suitable for producing disposable masks. The invention has simple process and obvious product effect, reduces the dependency on melt-blown equipment to a certain extent, meets the market demand, and has wide commercial application prospect and market value.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The following examples are conducted under conditions not specified, usually according to conventional conditions, or according to conditions recommended by the manufacturer.
The raw materials used in the specific embodiment are as follows:
the homo-polypropylene particles are made of MH7900 of LG chemistry;
the degradation agent is Acksu 301 degradation agent;
the adsorbent is Jeeps 4033 from Coli;
the softener is S600 of Japan gloss;
the antioxidant is a compound antioxidant of 1790(SI Group) and 168 (Pasteur, Germany).
The degrading agent DTBP comes from Lanzhou petrochemical.
PP225 powder is from Hongkong petrochemical.
Antioxidant 1010 is derived from basf.
The raw material compositions of the examples and the comparative examples are shown in table 1, and the preparation method comprises the following steps: pouring the polypropylene granules and the adsorbent into a low-speed stirring pot, adding the degradation agent, the softener and the antioxidant in a dropwise adding mode, premixing for 3 minutes, adding the mixture into an extruder for melt blending, and performing vacuum extrusion granulation by the extruder to obtain polypropylene melt-blown fabric; the melt extrusion temperature is 140-270 ℃, and the main machine rotating speed of the extruder is 400-600 revolutions per minute.
TABLE 1
Drying the prepared polypropylene melt-blown fabric in an air drying oven at 85 ℃ for 2 hours, wherein the breaking elongation of the specific embodiment is implemented according to ISO 527-2 standard and the speed is 50 mm/min; the melt flow rate was carried out according to ISO 1133, under test conditions 230 ℃ and 2.16 kg. Odor was tested according to PV3900 protocol C and the results of the performance data are shown in table 2 below.
TABLE 2
Table 2 above shows the polypropylene melt-blown fabric and the performance test results thereof respectively prepared in each example and comparative example, wherein the examples 1 to 4 prepare products with different melt value levels, and compare the toughness and the odor characteristics. Compared with the comparative example 1, the product prepared by the method in the example 1 without adopting the adsorbent and the softener has the advantages of reduced elongation at break, reduced toughness and poorer melt index stability. Compared with the comparative example 2, the embodiment 1 adopts the antioxidant 1010, compared with the antioxidant 1790, the antioxidant 1790 is easy to react with the 3,6, 9-triethyl-3, 6, 9-trimethyl-1, 4, 7-triperoxonane degrading agent, the utilization rate of the degrading agent is low, the increase range of the melt index adjustment is reduced, and the melt index stability is poor. Compared with the comparative example 3, the odor of the material is greatly improved by adopting the conventional degrading agent DTBP, and the melt finger stability is poor. Example 1 in comparison with comparative example 4, the material produced an unpleasant odor with a reduced melt number and increased volatility using conventional degradants DTBP and PP virgin powder. Compared with example 4, in example 3, the content of the adsorbent and the softener is obviously increased, the toughness of the material is greatly improved, the melt index is reduced, and the stability is further improved. Compared with the comparative example 5, the material in the example 1 shows that the adsorbent and the softener form a synergistic effect, and compared with a single softener, the toughness of the material is effectively improved, and the addition of the adsorbent is proved to effectively improve the stability of the melting value of the material. After the material provided by the embodiment of the invention is supplied to a client, the feedback sprayed cloth becomes compliant, the filtering efficiency and the production stability are good, and the affirmation is obtained.
Furthermore, it should be understood that various changes and modifications can be made by one skilled in the art after reading the above description of the present invention, and equivalents also fall within the scope of the invention as defined by the appended claims.
Claims (8)
1. The high-flexibility low-odor polypropylene material is characterized by comprising the following raw materials in parts by weight based on 100 parts of the total mass of the raw materials:
the degradation agent is 3,6, 9-triethyl-3, 6, 9-trimethyl-1, 4, 7-triperoxonane;
the adsorbent is a styrene elastomer;
the softener is metallocene polypropylene with the isotacticity of 50-65 percent;
the antioxidant comprises a main antioxidant and an auxiliary antioxidant, wherein the main antioxidant is 1,3, 5-tri (4-tert-butyl-3-hydroxy-2, 6-dimethylbenzyl) -1,3, 5-triazine-2, 4,6- (1H,3H,5H) -trione.
2. A high-flexibility low-odor polypropylene material according to claim 1, wherein the polypropylene is metallocene-catalyzed homo-polypropylene particles having a melt index of 60-150g/10min at 230 ℃ under 2.16 kg.
3. The high-flexibility low-odor polypropylene material as claimed in claim 1, wherein the secondary antioxidant is a phosphite antioxidant and/or an ester antioxidant.
4. The high-flexibility low-odor polypropylene material as claimed in claim 1, wherein the mass ratio of the primary antioxidant to the secondary antioxidant is 1-2: 1.
5. A high-flexibility low-odor polypropylene material as claimed in any one of claims 1 to 4, wherein the melt index at 230 ℃ under 2.16kg is 1000 to 2000g/10 min.
6. The method for preparing the high-flexibility low-odor polypropylene material as claimed in any one of claims 1 to 5, comprising: mixing polypropylene and an adsorbent, adding a degradation agent, a softener and an antioxidant in a dropwise manner under continuous stirring, adding the antioxidant into the mixture, uniformly premixing, adding the obtained material into an extruder for melt blending, and performing vacuum extrusion and granulation by the extruder to obtain the high-flexibility low-odor polypropylene material.
7. The preparation method of claim 6, wherein the temperature of the melt blending and vacuum extrusion of the extruder is 140-270 ℃, and the main machine rotation speed of the extruder is 400-600 rpm.
8. Use of the high-flexibility low-odor polypropylene material as claimed in any one of claims 1 to 5 in the manufacture of melt-blown fabric.
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2021
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| CN110760130A (en) * | 2018-07-27 | 2020-02-07 | 合肥杰事杰新材料股份有限公司 | Low-odor polypropylene material and preparation method thereof |
| CN111499970A (en) * | 2020-04-21 | 2020-08-07 | 广州市聚赛龙工程塑料股份有限公司 | Electret modified polypropylene material special for melt-blown non-woven fabric applicable to mask and preparation method thereof |
| CN111702982A (en) * | 2020-05-12 | 2020-09-25 | 安徽冠泓塑业有限公司 | Preparation method of high-MFR polypropylene melt-blown special material |
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| Title |
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| 杨竣棋等: "不同过氧化物对可控流变抗冲PP结构和性能的影响", 《塑料工业》 * |
| 郑晓曦等: "高熔融指数聚丙烯的生产探索", 《化工技术与开发》 * |
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