CN116102764A - Pore-forming agent, breathable film and preparation method thereof - Google Patents

Pore-forming agent, breathable film and preparation method thereof Download PDF

Info

Publication number
CN116102764A
CN116102764A CN202310022091.8A CN202310022091A CN116102764A CN 116102764 A CN116102764 A CN 116102764A CN 202310022091 A CN202310022091 A CN 202310022091A CN 116102764 A CN116102764 A CN 116102764A
Authority
CN
China
Prior art keywords
pore
magnetic powder
breathable film
resin
film
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
Application number
CN202310022091.8A
Other languages
Chinese (zh)
Other versions
CN116102764B (en
Inventor
黄俊俊
姜涛
赵娣芳
王三龙
桂成梅
张文庆
刘悦
沈诚
万佳佳
秦广超
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hefei University
Original Assignee
Hefei University
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hefei University filed Critical Hefei University
Priority to CN202310022091.8A priority Critical patent/CN116102764B/en
Priority claimed from CN202310022091.8A external-priority patent/CN116102764B/en
Publication of CN116102764A publication Critical patent/CN116102764A/en
Application granted granted Critical
Publication of CN116102764B publication Critical patent/CN116102764B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
    • B01D71/06—Organic material
    • B01D71/48—Polyesters
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D31/00—Materials specially adapted for outerwear
    • A41D31/04—Materials specially adapted for outerwear characterised by special function or use
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D31/00—Materials specially adapted for outerwear
    • A41D31/04—Materials specially adapted for outerwear characterised by special function or use
    • A41D31/14—Air permeable, i.e. capable of being penetrated by gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
    • B01D67/0002—Organic membrane manufacture
    • 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
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • 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
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • 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
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • 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
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C08J2323/06—Polyethene
    • 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
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
    • 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
    • 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
    • C08K9/00—Use of pretreated ingredients
    • C08K9/10—Encapsulated ingredients

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Textile Engineering (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • External Artificial Organs (AREA)

Abstract

The invention discloses a pore-foaming agent which is magnetic powder coated by a skin layer; wherein the cortex is nonpolar material with melting point less than or equal to 170deg.C. The invention also discloses application of the pore-foaming agent in a breathable film. The invention also discloses a breathable film, which comprises the following raw materials: resin, foaming agent and pore-forming agent. The invention also discloses a preparation method of the breathable film, which comprises the following steps: and (3) smelting and granulating the resin, the foaming agent and the polyurethane foam Kong Jimi, blow molding to obtain an intermediate film, heating the intermediate film, treating the intermediate film by an alternating magnetic field, stretching, cooling and shaping to obtain the breathable film. The pore-foaming agent can be used for preparing a breathable film by adopting a blow molding process; the method adopts a heating and alternating magnetic field treatment mode to enable the magnetic powder and the resin interface to be debonded to form holes, and the hole making effect is uniform; the pore-forming agent has low requirement on the particle size; the invention can also improve the local blood microcirculation of human body.

Description

Pore-forming agent, breathable film and preparation method thereof
Technical Field
The invention relates to the technical field of pore-forming agents, in particular to a pore-forming agent, a breathable film and a preparation method thereof.
Background
A breathable film is a microporous film that allows diffusion of water vapor therethrough but blocks leakage of liquid water. The common preparation method of the breathable film comprises the following steps: firstly, an inorganic powder pore-forming agent and resin are internally refined to prepare a material special for the breathable film; then the special material is made into a film by a tape casting or blow molding mode; finally, through applying unidirectional or bidirectional stretching action to the film, the resin matrix is separated from the surfaces of the pore-forming agent particles, and mutually communicated micro-pore channels are developed among the pore-forming agent particles, so that the micro-pore breathable film is formed. The special material for the breathable film is very critical in the preparation of the breathable film, the production speed and the process stability of the breathable film are determined by the performance of the special material for the breathable film, and the special material for the breathable film has important influence on the pore structure, the breathable performance and the mechanical performance of the breathable film. At present, a breathable film is prepared in a tape casting and stretching mode; when the blow molding mode is adopted, no stretching step is carried out after the film formation by blow molding, the existing pore-forming agent generally cannot form tiny pores, a breathable film cannot be prepared, and the process for preparing the breathable film by adopting the blow molding mode is rarely reported.
Moreover, the air permeable membrane has higher requirement on the particle size of the inorganic powder pore-forming agent: the pore-forming agent has small particle size, poor dispersibility and high oil absorption value, so that the quality of the film is unstable, and the working strength of the film when the film is mixed with resin is improved; in addition, the pore-forming agent with small particle size has larger specific surface area and surface energy (namely reverse agglomeration force relative to crushing force), and is easy to cause agglomeration to form large particles, so that the particle size distribution of the powder is wide, and the stability and the use effect of the breathable film processing technology are affected; the pore-forming agent has overlarge particle size, which can cause the pore in the cast film to become large, can cause the pore diameter in the cast film to become large and permeable, and can generate film breakage when serious; in addition, the large-particle pore-forming agent can become a stress concentration point in a high polymer matrix, so that the performance of the product is affected and even the product cannot be processed downstream.
The inorganic powder pore-forming agent has a D50 particle size of 1.8-2.2 μm, a D97 particle size of less than 6.5 μm, a particle content of 1-5 μm of 60% or more, a particle content of 10 μm or more of less than 100ppm, and a specific surface area of 5-15m 2 Density per gram, density>2.9g/cm 3 Effective hole making can be achieved. The index parameter of the pore-foaming agent is difficult to process, so that the production cost is high.
Disclosure of Invention
Based on the technical problems in the background technology, the invention provides a pore-forming agent, a breathable film and a preparation method thereof, and the invention selects at least one of magnetic powder coated by a skin layer as the pore-forming agent, so that the breathable film can be prepared by adopting a blow molding process; the method adopts a heating and alternating magnetic field treatment mode to debond the magnetic powder and the resin interface to form holes, and the holes are fixed by rapid cooling, and then the breathable film is prepared by shaping, so that the hole making effect is uniform; the pore-foaming agent has low requirement on particle size, and the pore-foaming agent and the breathable film are simple in preparation process and suitable for industrial production; the invention can also improve the local blood microcirculation of human body and promote the metabolism of organism.
The invention provides a pore-foaming agent which is magnetic powder coated by a skin layer; wherein the cortex is nonpolar material with melting point less than or equal to 170deg.C.
Preferably, the nonpolar substance is at least one of paraffin wax, polyethylene wax, and polypropylene wax.
Preferably, the porogen has a D50 particle size of 8-12 μm.
Preferably, the porogen has a D97 particle size of < 20 μm.
The D50 particle diameter is the mesh size through which 50wt% of the particles pass, and the D97 particle diameter is the mesh size through which 97wt% of the particles pass.
Preferably, the weight ratio of the magnetic powder to the skin layer is 100:0.01-5.
Preferably, the magnetic powder is nanocrystalline magnetic powder.
Preferably, the nanocrystalline magnetic powder is at least one of cobalt-iron nanocrystalline magnetic powder, nickel-iron nanocrystalline magnetic powder, strontium-iron nanocrystalline magnetic powder and barium-iron nanocrystalline magnetic powder.
Preferably, the preparation method of the magnetic powder coated by the skin layer comprises the following steps: mixing the magnetic powder and the cortex, stirring and coating to obtain the pore-foaming agent.
Preferably, the coating is stirred at 90-150 ℃.
Preferably, the magnetic powder, the skin layer and the polymer processing aid are mixed, stirred and coated to obtain the pore-foaming agent.
Preferably, the polymer processing aid comprises at least one of an antioxidant, a plasticizer, a lubricant, a stabilizer.
In the preparation method of the magnetic powder coated by the cortex, the stirring and coating time is not specified, so that the magnetic powder is coated by the cortex, and the stirring and coating time is preferably more than or equal to 60 minutes.
The polymer processing aid can be mixed and banburying with resin, pore-forming agent and the like when preparing the breathable film; or mixing with pore-forming agent, and banburying with resin; the polymer processing aid may also be mixed with the magnetic powder and the skin layer when preparing the magnetic powder coated with the skin layer.
When the magnetic powder coated by the skin layer is prepared, the polymer processing aid is added, so that the pore-forming agent and the polymer processing aid are premixed in advance, and the problem that the pore-forming agent is difficult to mix uniformly with a small amount of polymer processing aid when preparing the breathable film due to high magnetic powder density, so that the film performance is reduced can be avoided.
The amount and specific materials of the polymer processing aid are not specified, and the resin can be smoothly formed into a film, and the polymer processing aid can be commercially available.
The invention also provides application of the pore-foaming agent in the breathable film.
The invention also provides a breathable film, which comprises the following raw materials: resin, foaming agent and pore-forming agent.
Preferably, the weight of the blowing agent is 0.5-2% of the weight of the resin.
Preferably, the weight ratio of the pore-forming agent to the resin is 0.1-0.5:1.
Preferably, the resin is at least one of polyethylene, polypropylene, polylactic acid, and polyester.
The invention can avoid the problem of higher specific gravity of the breathable film caused by introducing magnetic powder by adding a proper amount of foaming agent, reduce the specific gravity of the breathable film, and the foaming agent can be polyurethane foaming agent and the like and can be purchased from the market.
The invention also provides a preparation method of the breathable film, which comprises the following steps: and (3) smelting and granulating the resin, the foaming agent and the polyurethane foam Kong Jimi, blow molding to obtain an intermediate film, heating the intermediate film, treating the intermediate film by an alternating magnetic field, cooling and shaping to obtain the breathable film.
In the cooling process, the film can be pulled to a water cooling roller for cooling, and the weak pulling force can further promote uniform hole making of the film; the speed of the water cooling roller or the traction roller is 0.5-2m/min faster than the speed of blow molding winding.
Preferably, the heating temperature is a temperature at which the resin is in a high-elastic state.
Preferably, the heating temperature is 13-30 ℃ lower than the melting point of the resin.
When the temperature is low, the deformation of the resin is very small; when the temperature is increased to a certain range, the deformation of the resin is obviously increased, and the deformation is relatively stable in a certain subsequent temperature interval, wherein the state is a high-elasticity state, and the corresponding temperature range is the high-elasticity state temperature; continuing to raise the temperature, the resin gradually becomes viscous fluid, and the state is viscous fluid, and the corresponding temperature range is viscous fluid temperature.
Preferably, the frequency of the alternating magnetic field is 10-50Hz.
Preferably, the alternating magnetic field has a strength of 0.1 to 1T.
Preferably, the alternating magnetic field treatment is performed for a time period of 10 to 100 times the alternating magnetic field period.
The breathable film can be used in the fields of medical treatment and health, personal care, construction, agricultural and sideline product packaging and the like, and can be used for manufacturing sanitary protection articles, breathable waterproof cloth and the like.
The beneficial effects are that:
1. the invention selects the magnetic powder coated by the skin layer as the pore-forming agent, and can realize the preparation of the breathable film by adopting a blow molding process; after the intermediate film is obtained by blow molding, heating to enable the resin film to be in a high-elastic state (the temperature is close to the viscous state temperature), simultaneously rotating magnetic powder in an alternating magnetic field to enable the magnetic powder to be debonded with a resin interface to form holes, rapidly dragging and cooling to enable the holes to be fixed, and shaping to obtain the breathable film; the proper substances are selected as the skin layer to cover the magnetic powder, so that the magnetic powder is dispersed in the resin more uniformly, the acting force of an interface can be weakened, and the interface between the magnetic powder and the resin is easier to debond to form holes; proper alternating magnetic field parameters are selected, so that the breathable film has a more uniform hole making effect;
2. the prior inorganic powder pore-forming agent has higher requirement on the size, and can realize effective pore-forming after reaching the specified size, and the pore-forming agent has larger particle size and simple preparation process; the preparation method of the pore-foaming agent and the breathable film is simple and is suitable for industrial production;
3. the magnet can improve the local blood microcirculation of the human body through the biological effect of the magnetic field, promote the metabolism of the organism, excite the activity and metabolism of human cells, and improve the wearing comfort of the breathable film, so that the breathable film has the physiotherapy function; the breathable film is applied to the protective clothing, so that the problem that medical care or epidemic prevention personnel can easily induce chronic diseases such as shoulder pain, neck pain, waist pain and leg pain due to long-time wearing of the protective clothing can be avoided; can be used for preventing or treating chronic diseases such as scapulohumeral periarthritis, lumbago, and skelalgia; and the magnetic powder forms tiny holes in the breathable film, so that the breathable film has the effect of blocking bacteria.
Drawings
FIG. 1 is a flow chart of the preparation process of the breathable film.
FIG. 2 is a schematic view of the working mechanism of the breathable film of the present invention.
Detailed Description
The technical scheme of the present invention will be described in detail by means of specific examples, which should be explicitly set forth for illustration, but should not be construed as limiting the scope of the present invention.
Example 1
A preparation method of a pore-foaming agent comprises the following steps:
grinding 100 parts of iron-cobalt powder nanocrystalline magnetic powder by adopting an air flow mill, adding 1 part of anionic surface active alpha-alkenyl sodium sulfonate into a grinding system, and improving the grinding efficiency to obtain fine magnetic powder;
100 parts of fine magnetic powder, 3 parts of polypropylene wax, 1.5 parts of antioxidant, 1 part of plasticizer, 1.9 parts of lubricant and 2.8 parts of stabilizer are taken, stirred and coated for 60min at 90-150 ℃, and the pore-forming agent is obtained by sieving and selecting powder with proper particle size by adopting an electrostatic classification process, wherein the particle size of the pore-forming agent D50 is 11 mu m, and the particle size of the pore-forming agent D97 is 19 mu m.
A method for preparing a breathable film, comprising the steps of:
respectively pouring 20 parts of pore-forming agent, 0.6 part of foaming agent and 100 parts of polypropylene resin (with the melting temperature of 195 ℃) into a stirrer for uniform mixing, then pouring into a feeding port of a double-screw extruder, and carrying out melt blending, extrusion, cooling and granulating on the blend to obtain sliced particles with the specification of phi 2 multiplied by 3 mm;
adding the slice particles into a film blowing experiment machine, adjusting the temperature of each region of the film blowing to 195 ℃, 200 ℃, 205 ℃ and 210 ℃, the rotation speed of a main machine to 15Hz, the traction rotation speed to 11Hz, and blowing to obtain an intermediate film with the thickness of 90 mu m; then heating the intermediate film to 180 ℃ and passing through an alternating magnetic field, then rapidly dragging the intermediate film to a water cooling roller for cooling, wherein the speed of the water cooling roller is 0.5-2m/min faster than the speed of blow molding and winding, and then carrying out heat preservation and shaping for 30min at 90 ℃ to obtain the breathable film, wherein the frequency of the alternating magnetic field is 40Hz, the intensity of the alternating magnetic field is 0.3T, and the time of the intermediate film in the alternating magnetic field is 2.25s.
FIG. 1 is a flow chart of the preparation process of the breathable film.
FIG. 2 is a schematic view of the working mechanism of the breathable film of the present invention.
Example 2
A preparation method of a pore-foaming agent comprises the following steps:
grinding 100 parts of ferronickel powder nanocrystalline magnetic powder by adopting an air flow mill to obtain fine magnetic powder;
100 parts of fine magnetic powder, 0.09 part of polyethylene wax, 0.8 part of antioxidant, 1.2 parts of plasticizer, 2.6 parts of lubricant and 3 parts of stabilizer are taken, stirred and coated for 60 minutes at 95 ℃, and powder with proper particle size is screened by adopting an electrostatic classification process to obtain the pore-foaming agent, wherein the particle size of the pore-foaming agent D50 is 8.5 mu m, and the particle size of the D97 is 15 mu m.
A method for preparing a breathable film, comprising the steps of:
respectively pouring 28 parts of pore-forming agent, 1 part of foaming agent and 100 parts of polyethylene resin (with the melting temperature of 176 ℃) into a stirrer for uniform mixing, then pouring into a feeding port of a double-screw extruder, and carrying out melt blending, extrusion, cooling and granulating on the blend to obtain sliced particles with the specification of phi 2 multiplied by 3 mm;
adding the slice particles into a film blowing experiment machine, adjusting the temperature of each region of the film blowing to 165 ℃, 175 ℃, 180 ℃ and 185 ℃, the rotating speed of a host machine to 17Hz, the traction rotating speed to 12Hz, and blowing to obtain an intermediate film with the thickness of 80 mu m; and then heating the intermediate film to 163 ℃ and passing through an alternating magnetic field, then rapidly dragging the intermediate film to a water cooling roller for cooling, wherein the speed of the water cooling roller is 0.5-2m/min faster than the speed of blow molding and winding, and then carrying out heat preservation and shaping for 30min at 90 ℃ to obtain the breathable film, wherein the frequency of the alternating magnetic field is 20Hz, the intensity of the alternating magnetic field is 0.6T, and the time of the intermediate film in the alternating magnetic field is 5s.
Example 3
A preparation method of a pore-foaming agent comprises the following steps: grinding 100 parts of iron strontium powder nanocrystalline magnetic powder by adopting an air flow mill, adding 1 part of anionic surface active alpha-alkenyl sodium sulfonate into a grinding system, and improving the grinding efficiency to obtain fine magnetic powder;
100 parts of fine magnetic powder, 3.3 parts of paraffin, 1 part of antioxidant, 1.8 parts of plasticizer, 2.2 parts of lubricant and 3 parts of stabilizer are taken, stirred and coated for 60 minutes at 140 ℃, and the pore-forming agent is obtained by screening and selecting powder with proper particle size by adopting an electrostatic classification process, wherein the particle size of the pore-forming agent D50 is 11.6 mu m, and the particle size of the pore-forming agent D97 is 19 mu m.
A method for preparing a breathable film, comprising the steps of:
respectively pouring 36 parts of pore-forming agent, 1.1 parts of foaming agent and 100 parts of polylactic acid resin (with the melting temperature of 174 ℃) into a stirrer for uniform mixing, then pouring into a feeding port of a double-screw extruder, and carrying out melt blending, extrusion, cooling and granulating on the blend to obtain sliced particles with the specification of phi 2 multiplied by 3 mm;
adding the slice particles into a film blowing experiment machine, adjusting the temperature of each region of film blowing to 165 ℃, 170 ℃, 175 ℃ and 180 ℃, the rotation speed of a main machine to 11Hz, the traction rotation speed to 8Hz, and blow molding to obtain an intermediate film with the thickness of 110 mu m; then heating the intermediate film to 156 ℃ and passing through an alternating magnetic field, then rapidly dragging the intermediate film to a water cooling roller for cooling, wherein the speed of the water cooling roller is 0.5-2m/min faster than the speed of blow molding and winding, and then carrying out heat preservation and shaping for 30min at 90 ℃ to obtain the breathable film, wherein the frequency of the alternating magnetic field is 21Hz, the intensity of the alternating magnetic field is 0.12T, and the time of the intermediate film in the alternating magnetic field is 4.5s.
When the slice particles are prepared, the rotation speed of the main machine, the rotation speed of the feeding machine and the rotation speed of the grain cutting are adjusted, so that the melt can be extruded uniformly and continuously, and the adjustment can be carried out according to actual conditions.
The breathable films prepared in examples 1 to 3 were tested and the results are shown in Table 1.
Porosity was determined according to astm d-2873 imbibition method; measuring bacterial filtration efficiency and non-oily particle filtration efficiency using an air permeability tester; the penetration of synthetic blood through the breathable film under a certain pressure was detected by a synthetic blood tester.
TABLE 1 detection results
Detecting items Example 1 Example 2 Example 3
Bacterial filtration efficiency% 98.8 99.1 98.3
Non-oily particles filtration efficiency% 98.2 97.9 97.0
Synthetic blood penetration mmHg 158 157 160
Respiratory resistance mmH 2 O/cm 2 5.9 5.8 5.7
Breathable film average pore size μm 4.7 4.1 5.2
Porosity% 41 46 52.6
As can be seen from Table 1, the present invention has good air permeability and filterability.
In order to explore the influence rule of the breathable films of the embodiments 1-3 of the invention on the skin blood microcirculation of human bodies, the breathable films of the embodiments 1-3 are manufactured into protective clothing, 5 healthy adult men and women are selected for each skin blood microcirculation experiment, and the commercial breathable protective clothing is used as a control group.
The subjects wear protective clothing of each group respectively, and each group is tested at 1h intervals; selecting test points 1 and 2 (test point 1 is 3cm distance from the fossa of elbow of the subject, and the area is 1.1 cm) 2 Is a skin of a subject; the test point 2 is the inner side of the forearm of the non-dominant hand of the subject, avoids the visible superficial vein on the skin surface of the human body, and is 5-7cm away from the wrist, and the area is 1.5-2cm 2 Skin), and measuring the perfusion amount of the skin blood microcirculation blood flow.
The results show that: when a subject wears the protective clothing manufactured by the breathable film in the embodiment 1-3, the skin blood microcirculation blood flow promoting effect is far better than that of a control group, so that the breathable film has a certain promoting effect on human skin blood microcirculation, and a certain reference basis is provided for the physiotherapy of the magnetic breathable film applied to chronic diseases such as shoulder neck waist and leg pain such as scapulohumeral periarthritis.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.

Claims (10)

1. The pore-forming agent is characterized by being magnetic powder coated by a skin layer; wherein the cortex is nonpolar material with melting point less than or equal to 170deg.C.
2. The porogen of claim 1, wherein the non-polar material is at least one of paraffin wax, polyethylene wax, polypropylene wax.
3. A porogen according to claim 1 or claim 2, wherein the porogen has a D50 particle size of 8-12 μm; preferably, the porogen has a D97 particle size of < 20 μm.
4. A pore-forming agent according to any one of claims 1 to 3, wherein the weight ratio of the magnetic powder to the skin layer is 100:0.01 to 5; preferably, the magnetic powder is nanocrystalline magnetic powder; preferably, the nanocrystalline magnetic powder is at least one of cobalt-iron nanocrystalline magnetic powder, nickel-iron nanocrystalline magnetic powder, strontium-iron nanocrystalline magnetic powder and barium-iron nanocrystalline magnetic powder.
5. A method of preparing a pore-forming agent according to any one of claims 1 to 4, wherein the method comprises the steps of: mixing the magnetic powder and the cortex, stirring and coating to obtain a pore-foaming agent; preferably, stirring and coating are carried out at 90-150 ℃; preferably, the magnetic powder, the skin layer and the polymer processing aid are mixed, stirred and coated to obtain the pore-foaming agent; preferably, the polymer processing aid comprises at least one of an antioxidant, a plasticizer, a lubricant, a stabilizer.
6. Use of a porogen according to any one of claims 1 to 5 in a breathable film.
7. The breathable film is characterized by comprising the following raw materials: a resin, a blowing agent, a porogen according to any one of claims 1 to 5; preferably, the weight of the foaming agent is 0.5-2% of the weight of the resin; preferably, the weight ratio of the pore-forming agent to the resin is 0.1-0.5:1; preferably, the resin is at least one of polyethylene, polypropylene, polylactic acid, and polyester.
8. A method of making a breathable film according to claim 7, comprising the steps of: and (3) smelting and granulating the resin, the foaming agent and the polyurethane foam Kong Jimi, blow molding to obtain an intermediate film, heating the intermediate film, treating the intermediate film by an alternating magnetic field, cooling and shaping to obtain the breathable film.
9. The method of producing a breathable film according to claim 8, wherein the heating temperature is a temperature at which the resin is in a high elastic state; preferably, the heating temperature is 13-30 ℃ lower than the melting point of the resin.
10. The method for producing a breathable film according to claim 8 or 9, characterized in that the frequency of the alternating magnetic field is 10-50Hz; preferably, the alternating magnetic field has a strength of 0.1 to 1T; preferably, the alternating magnetic field treatment is performed for a time period of 10 to 100 times the alternating magnetic field period.
CN202310022091.8A 2023-01-07 Pore-forming agent, breathable film and preparation method thereof Active CN116102764B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310022091.8A CN116102764B (en) 2023-01-07 Pore-forming agent, breathable film and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310022091.8A CN116102764B (en) 2023-01-07 Pore-forming agent, breathable film and preparation method thereof

Publications (2)

Publication Number Publication Date
CN116102764A true CN116102764A (en) 2023-05-12
CN116102764B CN116102764B (en) 2024-07-16

Family

ID=

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101088595A (en) * 2007-07-11 2007-12-19 湖北工业大学 Process of preparing plate porous membrane with high permeating flux
CN101121111A (en) * 2007-05-29 2008-02-13 北京联合大学生物化学工程学院 Method for producing magnetic polymer microsphere with coating method
CN102443187A (en) * 2011-10-28 2012-05-09 湖北工业大学 Method for preparing porous membrane by using hydrophilic modified inorganic filler as porogenic agent
WO2013091498A1 (en) * 2011-12-19 2013-06-27 南京大学 Magnetic microspherical resin with high specific surface area, method for preparing same and use of same
CN108939934A (en) * 2018-07-31 2018-12-07 哈工大（威海）创新创业园有限责任公司 A kind of magnetic porous membrane material of bio-compatible and preparation method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101121111A (en) * 2007-05-29 2008-02-13 北京联合大学生物化学工程学院 Method for producing magnetic polymer microsphere with coating method
CN101088595A (en) * 2007-07-11 2007-12-19 湖北工业大学 Process of preparing plate porous membrane with high permeating flux
CN102443187A (en) * 2011-10-28 2012-05-09 湖北工业大学 Method for preparing porous membrane by using hydrophilic modified inorganic filler as porogenic agent
WO2013091498A1 (en) * 2011-12-19 2013-06-27 南京大学 Magnetic microspherical resin with high specific surface area, method for preparing same and use of same
CN108939934A (en) * 2018-07-31 2018-12-07 哈工大（威海）创新创业园有限责任公司 A kind of magnetic porous membrane material of bio-compatible and preparation method thereof

Similar Documents

Publication Publication Date Title
US6261674B1 (en) Breathable microlayer polymer film and articles including same
DE69919163T2 (en) THREE-DIMENSIONAL, SHAPED, MOISTURE-FREE AND LIQUID-IMPEDED OBJECTS
US11807964B2 (en) Plant-based functional polypropylene spunbond non-woven fabric and preparation method thereof
JPS608224B2 (en) porous sheet
CN1620275A (en) Thin, high capacity absorbent structure and method for producing same
CN105968532A (en) Nano waterproof breathable film and preparation method thereof
CN203709321U (en) Haze-preventive antimicrobial mask
CN109355729B (en) Manufacturing method of Taiji stone and polyester fiber composite material
CN105963081A (en) Baby paper diaper and manufacturing method thereof
CN106397918A (en) Moisture permeable polyolefin micropore breathable film
CN101720338A (en) Absorbent articles comprising low basis weight films exhibiting low glue burn through
CN111513389B (en) Breathable and comfortable cool mask and preparation method thereof
CN116102764B (en) Pore-forming agent, breathable film and preparation method thereof
CN108623875A (en) A kind of High-strength air-permeable film composite material and preparation method
CN112618169B (en) Preparation method of antibacterial baby diaper
AU741939B2 (en) Breathable microlayer polymer film and articles including same
US20060160448A1 (en) Antimicrobial fabric and method for maunfacture of antimicrobial fabric
CN206641998U (en) A kind of biological antibiotic hydroscopic sanitary material
CN110712350A (en) Breathable film with moisture permeability, air permeability and high hydrostatic pressure and preparation method thereof
CN116102764A (en) Pore-forming agent, breathable film and preparation method thereof
CN111109699A (en) Method for manufacturing integrally-formed natural latex cup
CN111040279B (en) Preparation method of polyolefin microporous breathable film
CN111471320B (en) Preparation method of calcium carbonate powder
KR101448287B1 (en) Manufacturing method of sheet for medical having excellent permeability and antibacterial activity
KR20170064875A (en) Hybrid mask sheet and its manufacturing method

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