CN113388203A - Special material for radiation-resistant bactericidal polypropylene spun-bonded non-woven fabric and preparation method thereof - Google Patents
Special material for radiation-resistant bactericidal polypropylene spun-bonded non-woven fabric and preparation method thereof Download PDFInfo
- Publication number
- CN113388203A CN113388203A CN202110738644.0A CN202110738644A CN113388203A CN 113388203 A CN113388203 A CN 113388203A CN 202110738644 A CN202110738644 A CN 202110738644A CN 113388203 A CN113388203 A CN 113388203A
- Authority
- CN
- China
- Prior art keywords
- polypropylene
- radiation
- preparation
- special material
- resistant
- 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.)
- Granted
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
- C08K5/14—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
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K5/098—Metal salts of carboxylic 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
- C08K5/16—Nitrogen-containing compounds
- C08K5/20—Carboxylic acid amides
-
- 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
- C08K5/16—Nitrogen-containing compounds
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/3412—Heterocyclic compounds having nitrogen in the ring having one nitrogen atom in the ring
- C08K5/3432—Six-membered rings
- C08K5/3435—Piperidines
-
- 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
- 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
- D01F1/103—Agents inhibiting growth of microorganisms
-
- 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
- D01F1/106—Radiation shielding agents, e.g. absorbing, reflecting agents
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/10—Peculiar tacticity
Abstract
The invention belongs to the technical field of synthetic resin production, and particularly relates to a special material for an irradiation-resistant bactericidal polypropylene spun-bonded non-woven fabric and a preparation method thereof. The preparation method specifically comprises (1) online mixing of base polypropylene powder, peroxide and additive; (2) performing controllable rheological reaction (3) in the extruder cylinder to extrude, cut granules and centrifugally dry; (4) air conveying, product homogenizing and packaging for delivery. The invention utilizes a one-time hot processing technology, avoids direct contact with oxygen in the mixing and preparation processes, reduces the reduction of mechanical property and optical property caused by a hot processing process, does not need to additionally add an elastomer for toughening, and has low production cost. The special material provided by the invention can protect the polymer degradation induced by high-energy rays, has long oxidation induction period and is not easy to discolor.
Description
Technical Field
The invention belongs to the technical field of synthetic resin production, and particularly relates to a special material for an irradiation-resistant bactericidal polypropylene spun-bonded non-woven fabric and a preparation method thereof.
Background
Medical protective products such as surgical gowns, surgical caps, protective gowns, hand washing clothes and other spunbonded nonwoven products generally adopt an ethylene oxide sterilization mode, the sterilization period is long, and the residual ethylene oxide of the products is harmful to the health of users and pollutes the environment. It takes a long time to place with aeration or to force desorption to reduce the ethylene oxide concentration. Compared with ethylene oxide sterilization, electron beam irradiation is a more efficient and sanitary sterilization mode, and the conventional polypropylene material is obviously discolored when being irradiated by electron beams and the absorbed dose reaches 10kGy, has weakened and brittle mechanical properties and is difficult to endure the irradiation sterilization dose of medical non-woven fabric products.
In recent years, there have been some advances in the studies on the modification of polypropylene by electron beam irradiation sterilization and gamma ray irradiation sterilization.
Chinese patent CN96197212.2 is prepared from a blend of about 99-50 wt% propylene homopolymer or copolymer and 1-50 wt% polyethylene prepared by single site catalysis, but in medical and hygiene nonwoven applications, it is more preferred to be a fiber grade polypropylene homogeneous material. The CN202010237120.9 polypropylene resin composition comprises 0.05-0.2 part by mass of phenolic antioxidant and 0.05-0.2 part by mass of thioester antioxidant, wherein the thioester antioxidant is easy to generate peculiar smell in the thermal processing process, is mostly used for synthesizing rubber, and also needs to meet the requirement that the specified total migration limit of GB 9685-2016 plastic materials for food contact and products defines a corresponding limit, thereby influencing the use of polypropylene medical materials and products; in addition, the phenolic antioxidant is easily oxidized into quinone and quinone chromogenic substances by the free radical of peroxide generated in the irradiation process, so that the color change degree of the irradiated material is increased.
According to the scheme for producing the radiation-resistant sterilization by modifying the blending composition, oxygen is directly contacted in the processes of adding, homogenizing and mixing the mixed components, polypropylene granules which are subjected to primary hot processing forming are required to be prepared after secondary melting, primary hot processing is added compared with a process for directly preparing on an industrial device, the mechanical properties and the optical properties of products are reduced due to oxidation and degradation caused by oxygen contact and secondary hot processing, an elastomer is usually required to be added for toughening, the production cost is high, the productivity is low, and the energy consumption is high.
Disclosure of Invention
According to the defects in the prior art and in combination with the current research frontier, the invention provides the special material for the radiation-resistant bactericidal polypropylene spun-bonded non-woven fabric and the preparation method thereof. According to the chain reaction mechanism of the allyl free radical and the alkoxy free radical initiated by electron beam irradiation, the formula scheme is preferably as follows: adopts hindered amine antioxidant, peroxide with active oxygen content of 1.0-1.7%, phosphite ester auxiliary antioxidant, antacid and antistatic agent formula, selects auxiliary agent with low Saybolt color, avoids antioxidant with hindered phenols easy to be oxidized, and avoids oxidative discoloration after irradiation.
The invention is realized by adopting the following technical scheme:
the invention provides a preparation method of a special material for an irradiation-resistant bactericidal polypropylene spun-bonded non-woven fabric, which is characterized by comprising the following steps:
step (1): on-line mixing of base polypropylene powder with peroxide and additive
Adding basic polypropylene powder with mass flow rate of 25-30t/h, 1000ppm of hindered amine antioxidant, 600-1200ppm of phosphite antioxidant, 400ppm of antacid and 6100-7200ppm of solid peroxide with active oxygen content of 1.0-1.7% into an online mixer in a nitrogen atmosphere with oxygen content lower than 0.4% (mol), and simultaneously adding 40ppm of antistatic agent and staying for 6-15 s; in the extrusion granulation stage, a mode of simultaneously adding peroxide and a stabilizer is adopted, the special material for the polypropylene spun-bonded non-woven fabric which can resist the irradiation sterilization purpose is directly prepared by a one-step method, and the special material can be produced through a one-time thermal processing course without adding an elastomer for toughening, so that the production cost is low;
step (2): controlled rheological reactions in extruder barrels
The materials after on-line mixing enter an extrusion granulator set under the action of gravity and are divided into a feeding section, a melting section, a shearing section and an extrusion section;
a sectional temperature control mode is adopted in the reaction extrusion process, and the temperature control range is 220-235 ℃ in the feeding section of the cylinder body; in the melting section and the shearing section, the temperature control range is 235-250 ℃; finally, in the extrusion section, the temperature control range is 210-230 ℃, and finally, the online melt index instrument of the extrusion granulator set is stabilized at 35g/10min-42g/10 min;
and (3): extruding, granulating and centrifugally drying
Shearing the molten polymer into granules, centrifugally drying, and screening out unqualified granules;
and (4): air conveying, product homogenizing and packaging for delivery.
Specifically, the base polypropylene powder is homopolymerized polypropylene powder which is prepared by adopting a non-phthalate main catalyst and has the isotacticity of 96-99%, the ash content of 0.005-0.02% (wt) and the melt index of 2.5-3.5 g/10 min. The high isotacticity and low ash content powder prepared by adopting the non-phthalate main catalyst has the oxygen content of less than 0.4 percent in the conveyed nitrogen and is used for ensuring the good mechanical property of the special material.
Wherein, the hindered amine antioxidant in the step (1) comprises HALS-944 or HALS-622, and the phosphite antioxidant comprises AT-626 or AT-168.
Further, as a preferred embodiment of the present invention, the antacid in step (1) comprises calcium stearate, and the antistatic agent comprises pentaerythramide.
Further, as a preferable scheme of the invention, the temperature of the granulating water sent to the template in the step (3) is controlled to be 46-49 ℃, and the flow rate is 460-550 t/h; feeding the granules and water discharged from the extruder into a centrifugal dryer to separate the granules from the granulating water; and (4) feeding the dried granules into a vibrating screen to screen out the granules with unqualified sizes.
Further, as a preferred scheme of the present invention, in the step (4), the product particles are conveyed to the homogenizing silo through an air flow conveying system; using 4600m3/h-6500m3And (4) homogenizing for 5-6 h by adopting nitrogen gas per hour, sending the qualified sample to a packaging and stacking unit after sampling and analyzing, and packaging and delivering the qualified sample out of the factory.
The invention also provides the special material for the radiation-resistant bactericidal polypropylene spun-bonded non-woven fabric prepared by the preparation method.
The preparation method adopts the following improved principle:
(1) the radiation-resistant additive is preferably prepared, can provide protection for polymer degradation induced by high-energy rays while keeping the thermal processing stability, has small resistance effect with peroxide, and ensures that the product has long oxidation induction period and is not easy to discolor.
(2) The reaction extrusion process adopts a sectional temperature control mode, namely the peroxide is completely degraded; and avoid too fast local degradation reaction and generation of a large amount of volatile components to influence the sense of the product.
(3) The homopolymerized polypropylene powder with the melt index of 2.5g/10min-3.5g/10min has controllable rheological reaction, the melt index reaches 35g/10min-42g/10min, and the molecular weight distribution width (GPC method) is reduced from 6.5-7 to 2.6-3.0. The product is more beneficial to high-speed spinning.
Compared with the prior art, the invention has the beneficial effects that:
on a large-scale polypropylene device, the special material for the irradiation-resistant sterilized polypropylene spun-bonded non-woven fabric is produced by optimizing the formula of the irradiation-resistant additive and performing one-time thermal processing, so that the direct contact of oxygen in the mixing and preparation processes is avoided, the reduction of mechanical properties and optical properties caused by the thermal processing process is reduced, no additional elastomer is required for toughening, and the production cost is low; the product can provide protection for polymer degradation induced by high-energy rays, has long oxidation induction period and is not easy to discolor; the production capacity can reach 25-30 t/h.
Detailed Description
The present invention will be described in further detail in order to make the object and technical solution of the present invention more apparent. The experimental methods described in the following examples are all conventional methods unless otherwise specified; the specific techniques or conditions are not indicated in the examples, and the techniques or conditions are described in the literature in the field or according to the product specification; the reagents and materials are commercially available, unless otherwise specified.
The base polypropylene powder is homopolymerized polypropylene powder which is prepared by adopting a non-phthalate main catalyst and has the isotacticity of 96-99 percent, the ash content of 0.005-0.02 percent (wt) and the melt index of 2.5g/10min-3.5g/10 min.
The main catalyst is HR catalyst produced by Odada division of Beijing of China petrochemical catalyst Co.
Preparation of radiation-resistant sterilization polypropylene spun-bonded non-woven fabric special material
The preparation method of the special material for the radiation-resistant bactericidal polypropylene spunbonded nonwoven fabric comprises the following specific steps, in order to avoid repetition, the raw materials and preparation condition parameters related to the specific embodiment are uniformly described as follows, and detailed description is omitted in specific examples and comparative examples:
step (1): on-line mixing of base polypropylene powder with peroxide and additive
Basic polypropylene powder with the mass flow rate of 25-30t/h is added into an on-line mixer by a metering scale under the action of gravity together with 1200ppm of an antioxidant (hindered amine antioxidant or hindered phenol antioxidant), 600 ppm of phosphite antioxidant (AT-626 or AT-168), 400ppm of antacid calcium stearate and 7200ppm of solid peroxide (2, 5-dimethyl-2, 5-bis (tert-butylperoxy) ethane) 6100-containing active oxygen content of 1.0-1.7% in a nitrogen atmosphere with the oxygen content of less than 0.4% (mol), and simultaneously 40ppm of an antistatic agent (pentaerythritol amide) is added, and the retention time is 6-15 s.
Step (2): controlled rheological reactions in extruder barrels
The materials after on-line mixing enter an extrusion granulating unit under the action of gravity, and a barrel adopts a form of common temperature control by electric heating and desalted water and is divided into a feeding section, a melting section, a shearing section and an extrusion section.
A sectional temperature control mode is adopted in the reaction extrusion process, namely a slightly lower temperature control mode is controlled in a feeding section of the cylinder body, the temperature is controlled to be 220-235 ℃, and the phenomenon that local degradation reaction is too fast, a large amount of excessive degradation products are generated, and volatile components influence the sense of the product is avoided; maintaining high-temperature reaction environment in the melting section and the shearing section, controlling the temperature to be 235-250 ℃, ensuring complete degradation reaction and avoiding the residue of di-tert-butyl peroxide; finally, the temperature is controlled to be slightly lower in the extrusion section and is controlled to be 210-230 ℃ so as to improve the melt viscosity and facilitate the granulation and molding. Finally, the online melt index instrument of the extrusion granulator set is stabilized at 35g/10min-42g/10 min.
And (3): extruding, granulating and centrifugally drying
The melted polymer is extruded in strands from the die holes of the die plate under the double-screw shearing pushing of the extruding granulator set, and is cut into granules by a rotating cutter. The temperature of the granulating water sent to the template is controlled to be 46-49 ℃, and the flow rate is 460-550 t/h. The pellets and water exiting the extruder enter a centrifugal dryer that separates the pellets from the pellet water. And (4) feeding the dried granules into a vibrating screen to screen out unqualified granules with the diameter less than 2mm and the diameter more than 5 mm.
And (4): air-conveying, product homogenizing and packaging
The product particles are conveyed to the homogenization silo by an air flow conveying system. Using 4600m3/h-6500m3And (4) homogenizing for 5-6 h by adopting nitrogen gas per hour, and sending the qualified sample to a packaging and stacking unit by a conveying fan after the sample is analyzed, and packaging and delivering the qualified sample.
Specific parameters of examples 1 and 2 and comparative examples 1 to 4 are shown in tables 1 and 2, respectively.
TABLE 1 preparation parameters of the radiation-resistant sterilized polypropylene spunbonded nonwoven fabrics of examples 1 and 2
TABLE 2 preparation parameter table of radiation-resistant bactericidal polypropylene spun-bonded nonwoven fabric special material for comparative examples 1-4
Performance test of special material for radiation-resistant bactericidal polypropylene spun-bonded non-woven fabric
1. The specialty materials prepared in examples 1 and 2 were analyzed and the results are shown in tables 3 and 4.
TABLE 3 complete analysis data sheet for the product of example 1
TABLE 4 full analytical data sheet for the product of example 2
The width of the molecular weight distribution of the homopolymerized polypropylene powder is detected by a GPC method, and the width of the molecular weight distribution of the homopolymerized polypropylene powder is reduced to 2.6-3.0 from 6.5-7 of the base powder.
As can be seen from the results in tables 3 and 4, the homopolymerized polypropylene powder with the melt index of 2.5g/10min-3.5g/10min has the controllable rheological reaction, and the melt index reaches 35g/10min-42g/10 min.
2. The polypropylene nonwoven fabrics produced from the speciality materials prepared in examples 1 and 2 and comparative examples 1 to 4 were subjected to electron beam irradiation by Laishan division, a company Limited by Longkonfu Electron Accelerator technique, and the yellowness index at the same absorbed dose is shown in Table 5.
TABLE 5 yellow index comparison table corresponding to the same dose of electron beam irradiation
| Absorbed dose of radiation | Example 1 | Example 2 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 |
| 0 | -1.5 | -2.5 | -2 | -1.4 | -1.0 | -2.1 |
| 16 | 1.7 | 1 | 1.3 | 13.1 | 13.9 | 15.4 |
| 26 | 1.5 | 2.8 | 1.7 | 21.8 | 21.1 | 33.7 |
| 38 | 2.9 | 3.2 | 2.6 | 22.6 | 22.3 | 37.4 |
| 51 | 3.9 | 6.5 | 4.1 | 28.7 | 29.0 | 38.9 |
As can be seen from the comparative data in Table 5, examples 1, 2 and comparative example 1, which employ hindered amine type antioxidants, have the least magnitude of yellow index rise when receiving the same absorbent dose, and the least change in yellow index for example 1, which employs HALS-944(1000 ppm); the comparative examples 2 to 4 using hindered phenol antioxidants had the most increased yellow index and the products after irradiation had significantly yellow in appearance.
3. The whiteness and the transverse and longitudinal strength of the nonwoven fabric product prepared from the special material of the example 1 are compared with those of the comparative examples 2 and 3 by gamma ray irradiation treatment of Qingdao branch of the gold irradiation GmbH under the condition that the absorbed doses are 31kGy and 52kGy, and are shown in the table 6.
TABLE 6 Gamma ray irradiation treatment corresponding whiteness, transverse and longitudinal strength comparison table
As can be seen from the comparative data in Table 6, the polypropylene spunbonded nonwoven products produced using the specialty materials are resistant to discoloration when subjected to the same radiation dose. Compared with comparative examples 2 and 3, the irradiation treatment has lighter influence on the mechanical properties of the special material, and the reduction range of the strength and the elongation is small.
4. The total amount of volatile organic compounds of the nonwoven fabric specialty media prepared in examples 1 and 2 and comparative examples 1-4 was determined and the results are shown in Table 7.
TABLE 7 comparison table of volatile organic compounds and total amount detection results of special materials
The invention adopts 'zone temperature control' for the extrusion granulator set, the feeding section of the cylinder body is controlled at 220-235 ℃, so that the phenomenon that the local degradation reaction is too fast, a large amount of over-degraded products are generated, and the volatile components influence the product sense is avoided; the melting section and the shearing section keep a high-temperature reaction environment, the temperature is controlled to be 235-250 ℃, so that the degradation reaction is complete, and the residue of di-tert-butyl peroxide is avoided.
The detection result of the total amount of the volatile organic compounds of the special material for the non-woven fabric shows that the total amount of the volatile organic compounds of the embodiment 1, the embodiment 2, the comparative example 3 and the comparative example 4 which are produced by adopting the mode of zone temperature control is obviously lower than that of the comparative example 1 and the comparative example 2 with uniform temperature control, and the products of ketone, aldehyde and ether after the polymer is oxidized are greatly reduced.
It should be understood that the above description is only a preferred embodiment of the present invention, and not intended to limit the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalents may be made in the technical solutions described in the foregoing embodiments, or some technical features may be substituted. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The preparation method of the special material for the radiation-resistant bactericidal polypropylene spun-bonded non-woven fabric is characterized by comprising the following steps of:
step (1): on-line mixing of base polypropylene powder with peroxide and additive
Adding basic polypropylene powder with mass flow rate of 25-30t/h, 1000ppm of hindered amine antioxidant, 600-1200ppm of phosphite antioxidant, 400ppm of antacid and 6100-7200ppm of solid peroxide with active oxygen content of 1.0-1.7% into an online mixer in a nitrogen atmosphere with oxygen content lower than 0.4% (mol), and simultaneously adding 40ppm of antistatic agent and staying for 6-15 s;
step (2): controlled rheological reactions in extruder barrels
The materials after on-line mixing enter an extrusion granulator set under the action of gravity and are divided into a feeding section, a melting section, a shearing section and an extrusion section;
a sectional temperature control mode is adopted in the reaction extrusion process, and the temperature control range is 220-235 ℃ in the feeding section of the cylinder body; in the melting section and the shearing section, the temperature control range is 235-250 ℃; finally, in the extrusion section, the temperature control range is 210-230 ℃, and finally, the online melt index instrument of the extrusion granulator set is stabilized at 35g/10min-42g/10 min;
and (3): extruding, granulating and centrifugally drying
Shearing the molten polymer into granules, centrifugally drying, and screening out unqualified granules;
and (4): air conveying, product homogenizing and packaging for delivery.
2. The method for preparing the special material for the radiation-resistant bactericidal polypropylene spunbonded nonwoven fabric according to claim 1, wherein the basic polypropylene powder is homopolymerized polypropylene powder which is prepared by adopting a non-phthalate main catalyst and has the isotacticity of 96-99%, the ash content of 0.005-0.02% (wt) and the melt index of 2.5-10 min-3.5g/10 min.
3. The preparation method of the special radiation-resistant bactericidal polypropylene spunbonded nonwoven fabric material as claimed in claim 2, wherein the hindered amine antioxidant in the step (1) comprises HALS-944 or HALS-622, and the phosphite antioxidant comprises AT-626 or AT-168.
4. The method for preparing the special material for the radiation-resistant bactericidal polypropylene spunbonded nonwoven fabric as claimed in claim 3, wherein the acid-resistant agent in the step (1) comprises calcium stearate, and the antistatic agent comprises pentaerythramide.
5. The method for preparing the special material for the radiation-resistant bactericidal polypropylene spunbonded nonwoven fabric as claimed in claim 1, wherein the temperature of the granulating water sent to the template in the step (3) is controlled to be 46-49 ℃, and the flow rate is 460-550 t/h; feeding the granules and water discharged from the extruder into a centrifugal dryer to separate the granules from the granulating water; and (4) feeding the dried granules into a vibrating screen to screen out the granules with unqualified sizes.
6. The preparation method of the special radiation-resistant bactericidal polypropylene spunbonded nonwoven fabric material as claimed in claim 1, wherein the particles of the product are conveyed to a homogenizing silo by an air flow conveying system in the step (4); using 4600m3/h-6500m3And (4) homogenizing for 5-6 h by adopting nitrogen gas per hour, sending the qualified sample to a packaging and stacking unit after sampling and analyzing, and packaging and delivering the qualified sample out of the factory.
7. The special material for the radiation-resistant bactericidal polypropylene spun-bonded non-woven fabric prepared by the preparation method of any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110738644.0A CN113388203B (en) | 2021-06-30 | 2021-06-30 | Special material for radiation-resistant bactericidal polypropylene spun-bonded non-woven fabric and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110738644.0A CN113388203B (en) | 2021-06-30 | 2021-06-30 | Special material for radiation-resistant bactericidal polypropylene spun-bonded non-woven fabric and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113388203A true CN113388203A (en) | 2021-09-14 |
| CN113388203B CN113388203B (en) | 2022-07-05 |
Family
ID=77624732
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110738644.0A Active CN113388203B (en) | 2021-06-30 | 2021-06-30 | Special material for radiation-resistant bactericidal polypropylene spun-bonded non-woven fabric and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113388203B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014069911A1 (en) * | 2012-11-05 | 2014-05-08 | 주식회사 만텍 | Technology for producing peroxide masterbatches, and method for reforming polypropylene using same |
| US20160311944A1 (en) * | 2013-12-13 | 2016-10-27 | Braskem S.A. | Method for producing controlled rheology polypropylene, polypropylene, use thereof and manufactured articles |
| CN109082009A (en) * | 2018-07-12 | 2018-12-25 | 锦州英诺威科技服务有限公司 | A kind of high melting means polypropylene fibre rheology comprehensively modifying master batch and preparation method thereof |
| CN110183559A (en) * | 2019-04-04 | 2019-08-30 | 东华能源股份有限公司 | A kind of production method of high fluidity spun-bonded non-woven acrylic resin |
| CN112063043A (en) * | 2020-08-18 | 2020-12-11 | 中国同辐股份有限公司 | Radiation-resistant melt-blown polypropylene composite material and preparation method and application thereof |
| CN112266535A (en) * | 2020-10-28 | 2021-01-26 | 中国石油化工股份有限公司 | Polypropylene material for non-woven fabric and preparation method thereof |
-
2021
- 2021-06-30 CN CN202110738644.0A patent/CN113388203B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014069911A1 (en) * | 2012-11-05 | 2014-05-08 | 주식회사 만텍 | Technology for producing peroxide masterbatches, and method for reforming polypropylene using same |
| US20160311944A1 (en) * | 2013-12-13 | 2016-10-27 | Braskem S.A. | Method for producing controlled rheology polypropylene, polypropylene, use thereof and manufactured articles |
| CN109082009A (en) * | 2018-07-12 | 2018-12-25 | 锦州英诺威科技服务有限公司 | A kind of high melting means polypropylene fibre rheology comprehensively modifying master batch and preparation method thereof |
| CN110183559A (en) * | 2019-04-04 | 2019-08-30 | 东华能源股份有限公司 | A kind of production method of high fluidity spun-bonded non-woven acrylic resin |
| CN112063043A (en) * | 2020-08-18 | 2020-12-11 | 中国同辐股份有限公司 | Radiation-resistant melt-blown polypropylene composite material and preparation method and application thereof |
| CN112266535A (en) * | 2020-10-28 | 2021-01-26 | 中国石油化工股份有限公司 | Polypropylene material for non-woven fabric and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 曹圣贤等: "无纺布专用聚丙烯树脂PPH-Y35的开发", 《河南化工》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113388203B (en) | 2022-07-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4053111B2 (en) | Radiation viscous fracture polypropylene and fibers made therefrom | |
| EP0063654B1 (en) | Improved method of visbreaking polypropylene | |
| CN1043148C (en) | Application of polypropylene with free-end long chain branching | |
| US4282076A (en) | Method of visbreaking polypropylene | |
| CN111205563A (en) | Melt-blown polypropylene and preparation method and application thereof | |
| US5405917A (en) | Selective admixture of additives for modifying a polymer | |
| US20090209158A1 (en) | Pelletized Polymer Product And Process For Making The Same | |
| CN111533994B (en) | High-cracking-rate high-melt-index polypropylene material and preparation method and application thereof | |
| CN1143656A (en) | Polyolefin compositions resistant to high energy radiation, and articles produced therefrom | |
| US11673977B2 (en) | Methods for modifying the rheology of polymers | |
| CN106751158B (en) | A kind of radiation resistance high molecular material and its preparation method and application | |
| CN113388203B (en) | Special material for radiation-resistant bactericidal polypropylene spun-bonded non-woven fabric 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 | |
| CN112063043A (en) | Radiation-resistant melt-blown polypropylene composite material and preparation method and application thereof | |
| CN101735409A (en) | Modified polylactic acid material under low irradiation dose and preparation method thereof | |
| US4731397A (en) | Thermal stabilization of acetal polymers | |
| CN113088004A (en) | Special radiation-resistant sterilization polypropylene injection molding material and preparation method thereof | |
| CA1156602A (en) | Method of visbreaking polypropylene | |
| CN112831118B (en) | Polypropylene melt-blown material toughening master batch and preparation method thereof | |
| JPH02215848A (en) | Radiation-resistant polypropylene resin composition | |
| CN111057339B (en) | Low-odor low-VOC polypropylene composite material and preparation method thereof | |
| CN116874930A (en) | Low-precipitation radiation-resistant medical polypropylene and preparation method thereof | |
| Eltief | Polyethylene (Stabilization and Compounding) | |
| JP3697329B2 (en) | Polypropylene composition | |
| CN108329578A (en) | A kind of Low-odor polypropylene material 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 |