CN109912878B - Raw material composition for preparing film-blowing breathable film, film-blowing breathable film and preparation of film-blowing breathable film - Google Patents
Raw material composition for preparing film-blowing breathable film, film-blowing breathable film and preparation of film-blowing breathable film Download PDFInfo
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Abstract
The invention provides a raw material composition for preparing a film-blowing breathable film, the film-blowing breathable film and a preparation method thereof, wherein the raw material composition comprises 50-70% of inorganic filler coated with a coupling agent on the surface, 25-50% of linear low-density polyethylene and 0.2-1.0% of antioxidant, wherein the total weight of the raw material composition is 100%; the linear low density polyethylene comprises 1-3 linear low density polyethylenes with different densities, and the density distribution of the linear low density polyethylenes with different densities is 0.910g/cm3To 0.935g/cm3The melt index distribution at 190 ℃ is 2.5-0.5g/10 min. The invention also provides master batches of the film blowing breathable film, which are prepared from the raw material composition. The invention also provides a film blowing and breathable film which is obtained by blowing the master batch into a film by adopting an upward film blowing method and then performing unidirectional stretching on the film. The blown film breathable film has excellent comprehensive performance and lower cost.
Description
Technical Field
The invention relates to a raw material composition for preparing a film-blowing breathable film, the film-blowing breathable film and preparation thereof, and belongs to the technical field of medical products.
Background
With the improvement of living standard of people, the policy of two births in China is released, the aging of the population in China is gradually increased, and the popularization rate and the use amount of disposable sanitary products such as sanitary towels, baby diapers, adult diapers and the like are greatly increased; the microporous waterproof breathable film is a basement membrane for preparing the product, is used for achieving the waterproof and breathable effects, and the preparation method comprises the following steps: the plastic film is prepared by inorganic powder modified resin, countless micropores which are communicated with each other are formed by a stretching process, the pore diameter is 0.1-5 mu m, and the micropores can allow water vapor and air to permeate and can effectively prevent liquid such as water and the like from permeating; breathability is a major functional indicator of a paper diaper.
The production process of the breathable film on the market at present mainly comprises two types: 1) the casting method is followed by unidirectional stretching, and 2) the upward film blowing method is followed by unidirectional stretching. Wherein, the former includes: mixing breathable film raw materials, extruding, granulating, casting into sheets at a certain temperature, and then stretching, specifically as shown in Chinese patent CN104558795A, it discloses a method for preparing polyolefin breathable films by a casting method, and the method obtains breathable films with high moisture permeability by controlling the particle size of inorganic filler; however, the breathable film prepared by adopting the casting method has the defects of insufficient hydrostatic pressure resistance and insufficient physical strength, liquid leakage can be caused in use, and the method of increasing the thickness of the breathable film or increasing the gram weight of the breathable film by many manufacturers for improving the hydrostatic pressure resistance of the breathable film causes the obtained product to be not light, thin and soft enough and the use comfort to be reduced; the latter has only begun to be popularized in China in recent years, because of the particularity of the used raw materials, a higher stretching ratio, a lower gram weight (weight of a film per square meter), a higher water vapor transmission rate and a larger breadth can be achieved, and further the cost of the raw materials can be reduced while the performance of the breathable film is improved, specifically, as shown in Chinese patent CN107674283A, the method discloses a method for preparing the breathable film by a film blowing method, and the method enables the breathable film to be lighter and thinner by a biaxial stretching process, so that the breathability of the breathable film is improved. However, the formula of the breathable film prepared by the film blowing method in the market at present is not complete enough, and is mainly reflected in low water permeability and low longitudinal tensile strength. From the raw material production process, the main problems of the current raw material production are that the yield is not high, the pressure of an extrusion head is too high, the melt temperature is too high, the abrasion of a melt pump is easily caused, and the high-temperature crosslinking of the raw materials is easily caused.
In summary, it has become a technical problem to be solved in the art to provide a raw material composition for preparing a soft blown film breathable film with high moisture permeability, a master batch of the blown film breathable film, and a preparation method and application thereof.
Disclosure of Invention
In order to solve the above-mentioned disadvantages and drawbacks, it is an object of the present invention to provide a raw material composition for producing a film-blowing breathable film.
The master batch of the film-blowing breathable film is prepared from the raw material composition for preparing the film-blowing breathable film.
The invention also aims to provide a preparation method of the master batch of the film-blowing breathable film.
The invention further aims to provide the film-blowing breathable film, which is obtained by blowing the master batch of the film-blowing breathable film into a film by an upward film-blowing method and then performing unidirectional stretching on the film.
The final purpose of the invention is to provide the application of the film-blowing breathable film in disposable sanitary products, medical products and health-care products.
In order to achieve the above objects, in one aspect, the present invention provides a raw material composition for preparing a film-blowing breathable film, comprising 50% to 70% of an inorganic filler of a surface-coating coupling agent, 25% to 50% of linear low density polyethylene, and 0.2% to 1.0% of an antioxidant, based on 100% by weight of the total weight of the raw material composition for preparing a film-blowing breathable film;
wherein the linear low density polyethylene comprises 1 to 3 linear low density polyethylenes with different densities, and the density distribution of the linear low density polyethylenes with different densities is 0.910g/cm3To 0.935g/cm3The melt index distribution at 190 ℃ is 2.5-0.5g/10 min.
According to a specific embodiment of the present invention, the raw material composition preferably comprises 50% to 70% of the inorganic filler of the surface-coating coupling agent, 25% to 50% of the linear low density polyethylene, 0.2% to 1.0% of the antioxidant, and 0.1% to 3.0% of other processing aids (other processing aids except the antioxidant), based on 100% of the total weight of the raw material composition for preparing the blown film breathable film.
According to a specific embodiment of the present invention, in the raw material composition, preferably, when the linear low density polyethylene includes 2 kinds of linear low density polyethylenes, each of the linear low density polyethylenes having different densities is used in an amount ranging from 25% to 75% based on the total weight of the linear low density polyethylene taken as 100%, but it is required to ensure that the sum of the 2 kinds of linear low density polyethylenes having different densities is 100%.
According to a specific embodiment of the present invention, in the raw material composition, preferably, when the linear low density polyethylene includes 3 kinds of linear low density polyethylenes, the amount of each of the linear low density polyethylenes is in the range of 20% to 60% based on the total weight of the linear low density polyethylene as 100%, but it is required to ensure that the total amount of the 3 kinds of linear low density polyethylenes is 100%.
According to a specific embodiment of the present invention, in the raw material composition, preferably, when the linear low density polyethylene includes 2 or 3 linear low density polyethylenes having different densities, the selection principle of the linear low density polyethylenes having different densities is as follows:
the melt index of the higher density linear low density polyethylene should be less than or equal to the melt index of the lower density linear low density polyethylene.
As in one embodiment of the present invention, when the linear low density polyethylene comprises 2 linear low density polyethylenes of different densities, wherein the first linear low density polyethylene has a density of 0.918g/cm3The melt index at 190 ℃ is 2.0g/10 min; the second linear low density polyethylene had a density of 0.927g/cm3The melt index at 190 ℃ was 1.0g/10 min. It can be seen that the first linear low density polyethylene has a lower density and a higher melt index than the second linear low density polyethylene.
Of course, it is also possible to use linear low density polyethylenes comprising 2 different density linear low density polyethylenes, the first of which is shown in inventive example 2The density of the alkene is 0.927g/cm3The melt index at 190 ℃ is 1.0g/10 min; the second linear low density polyethylene had a density of 0.920g/cm3The melt index at 190 ℃ was 1.0g/10 min. That is, the melt index of 2 different densities of linear low density polyethylene is the same.
According to an embodiment of the present invention, in the raw material composition, preferably, the antioxidant includes a primary antioxidant and a secondary antioxidant;
the total weight of the raw material composition for preparing the blown film breathable film is 100%, the dosage of the main antioxidant is 0.1-0.5%, and the dosage of the auxiliary antioxidant is 0.1-0.5%.
In a specific embodiment of the invention, the primary antioxidant used is IRGANOX 1010 and the secondary antioxidant is IRGAFOS 168; both are conventional materials used in the art and are commercially available.
According to an embodiment of the present invention, in the raw material composition, preferably, the inorganic filler includes one or a combination of several of calcium carbonate, silica and fly ash;
the coupling agent comprises one or more of stearic acid, titanate, aluminate, silane and phosphate. Wherein, the inorganic filler coated with the coupling agent on the surface can be better dispersed in the linear low-density polyethylene evenly and is not easy to agglomerate.
According to a particular embodiment of the invention, in the raw material composition, preferably, the calcium carbonate is ground calcium carbonate, with a powder particle size of 50% or more distributed between 1 and 2 microns.
According to a specific embodiment of the present invention, in the raw material composition, preferably, the linear low density polyethylenes of different densities include, but are not limited to, metallocene polyethylenes.
According to a specific embodiment of the present invention, in the raw material composition, preferably, the other Processing aid comprises ppa (polymer Processing aid).
Wherein the PPA used herein is a fluoropolymer for use in a processing aid, in embodiments of the present invention, the PPA used may be the product designated AMF 705.
According to the specific embodiment of the present invention, in the raw material composition, linear low density polyethylenes with different densities are compounded (and the melt index of the linear low density polyethylenes with different densities is considered at the same time), so that better extrusion processability can be achieved, and meanwhile, the blown film breathable film prepared by using the raw material composition also has good properties, such as low gram weight, high moisture permeability, high breaking strength and elongation, and the like.
On the other hand, the invention also provides master batches of the film-blowing breathable film, wherein the master batches of the film-blowing breathable film are prepared from the raw material composition for preparing the film-blowing breathable film.
In another aspect, the invention further provides a preparation method of the master batch of the film-blowing breathable film, wherein the preparation method comprises the following steps:
(1) uniformly mixing the raw material composition for preparing the film-blowing breathable film by adopting a double-screw mixing extruder;
(2) extruding a product obtained after uniformly mixing by adopting a single-screw extruder;
(3) and performing water ring-cutting granulation to obtain master batches of the film-blowing breathable film.
According to the specific embodiment of the invention, in the preparation method of the master batch of the blown film breathable film, preferably, in the step (1), the temperature of the feeding section of the twin-screw mixing extruder is 140-.
According to the specific embodiment of the invention, in the preparation method of the master batch of the blown film breathable film, preferably, in the step (2), the working temperature of the single-screw extruder is 180-240 ℃.
According to a specific embodiment of the present invention, in the preparation method of the master batch of the blown film breathable film, preferably, the twin-screw mixing extruder is provided with a main feeding port, a first side feeding system and a second side feeding system.
According to the specific embodiment of the invention, in the preparation method of the master batch of the film-blowing breathable film, a person skilled in the art can install the first side feeding system and the second side feeding system at any two cylinders of the twin-screw mixing extruder according to the field operation requirement; in the embodiment of the invention, the first side feeding system and the second side feeding system can be arranged at the seventh barrel and the tenth barrel of the double-screw mixing extruder.
According to a specific embodiment of the present invention, in the preparation method of the master batch for a blown film breathable film, preferably, the step (1) of the preparation method specifically comprises the following steps:
adding the components except the inorganic filler with the surface coated with the coupling agent in the raw material composition for preparing the film-blowing breathable film into a double-screw mixing extruder through the main feeding port, and respectively adding the inorganic filler with the surface coated with the coupling agent into the double-screw mixing extruder through a first side feeding system and a second side feeding system;
more preferably, the weight ratio of the inorganic filler which is added into the double-screw mixing extruder through the first side feeding system and the second side feeding system and is coated with the coupling agent on the surface is 2:3-3: 2;
in one embodiment of the present invention, the weight ratio of the inorganic filler with the surface coating coupling agent added into the twin-screw mixing extruder through the first side feeding system and the second side feeding system may be 1: 1;
or;
adding the components except the inorganic filler with the surface coated with the coupling agent and part of the inorganic filler with the surface coated with the coupling agent in the raw material composition for preparing the film-blowing breathable film into a double-screw mixing extruder through the main feeding port, and adding the other part of the inorganic filler with the surface coated with the coupling agent into the double-screw mixing extruder through a first side feeding system and a second side feeding system respectively;
more preferably, the weight percentages of the inorganic filler of the surface-coated coupling agent added into the double-screw mixing extruder by the main feeding port, the first side feeding system and the second side feeding system are respectively 20-80%, 30-60% and 30-60%, based on the total weight of the inorganic filler of the surface-coated coupling agent being 100%; wherein the sum of the weight percentages of the inorganic fillers of the surface coating coupling agent added into the double-screw mixing extruder through the main feeding port, the first side feeding system and the second side feeding system is 100 percent.
In one embodiment of the present invention, the weight ratio of the inorganic filler of the surface-coated coupling agent added to the twin-screw mixing extruder through the main feeding port, the first side feeding system and the second side feeding system may be 1:1: 1.
According to the specific embodiment of the invention, in the preparation method of the master batch of the film-blowing breathable film, preferably, the length-diameter ratio of the twin-screw mixing extruder is 48-56, and the number of barrel sections is 12-14;
the diameter of the screw of the double-screw mixing extruder needs to be adjusted according to the output requirement of the film blowing and breathable film in the operation process, and the diameter is preferably 75mm-100mm in the invention.
According to the specific embodiment of the invention, in the preparation method of the master batch of the blown film breathable film, preferably, the length-diameter ratio of the single-screw extruder is 5-9, and the screw diameter is 150-250 mm.
In one embodiment of the present invention, the length-diameter ratio of the single screw extruder may be 9, and the screw diameter may be 200 mm.
According to a specific embodiment of the invention, in the step (3) of the preparation method of the master batch of the blown film breathable film, the granulating system adopted by the water ring cutting granulation can be a water ring die surface hot granulating system. Wherein the water ring die face hot pelletizing system is conventional equipment used in the field.
At present, in the traditional breathable film granulation process in the field, if the content of the inorganic filler (such as calcium carbonate) is about 50%, the breathable film can be pulled into strips and cut, but generally underwater cutting is carried out, pressure can be built up through a melt pump in the underwater cutting so as to reduce the pressure and the abrasion at the tail end of a double screw, and meanwhile, the yield can be improved. The melt pump itself, however, also generates relatively large wear. In the preparation method of the master batch of the film-blowing breathable film, a single-screw extruder and water ring-cutting granulation combination is used, pressure is built through the single-screw extruder, the yield is improved, meanwhile, the abrasion is reduced, and meanwhile, the purchase cost can be greatly reduced.
According to the specific embodiment of the invention, in the preparation method of the master batch of the film-blowing breathable film, the strong shearing action of the double-screw mixing extruder can ensure that inorganic filler powder is dispersed in linear low-density polyethylene more uniformly, which is beneficial to good plasticization of the linear low-density polyethylene, reduces agglomeration of inorganic filler (such as calcium carbonate), avoids crystal point formation in the film-blowing process and improves the water vapor transmission rate of a finished product; the double-screw mixing extruder is provided with a first side feeding system and a second side feeding system, which is beneficial to the dispersion of inorganic fillers (such as calcium carbonate) in the linear low-density polyethylene.
In another aspect, the invention further provides a film-blowing breathable film, wherein the film-blowing breathable film is obtained by blowing master batches of the film-blowing breathable film into a film by an upward film-blowing method and then performing unidirectional stretching on the film.
According to a specific embodiment of the present invention, in the blown film breathable film, preferably, the temperature of the unidirectional stretching is 70 to 100 ℃, the blow-up ratio is 2.3 to 3.7, and the unidirectional stretching ratio is 3.0 to 4.5.
According to a specific embodiment of the invention, in the film blowing breathable film, in order to prevent the master batch of the film blowing breathable film from causing problems of film surface hole breaking, scorching and the like due to too high moisture content in a subsequent film blowing process, before the master batch of the film blowing breathable film is blown into a film, the operation of drying the master batch of the film blowing breathable film is further included, wherein the drying temperature is 80-100 ℃, the drying time is 3-5h, and the moisture content of the master batch of the dried film blowing breathable film is kept to be less than 200 ppm. The master batch of the film blowing breathable film is dried and then blown into a film, so that the production efficiency can be further improved.
According to the specific embodiment of the invention, in the blown film breathable film, the up-blowing film method is a conventional method used in the field, and a person skilled in the art can operate according to the existing up-blowing film method steps according to the field operation requirements, and can reasonably set the process parameters involved in the operation process as long as the purpose of the invention can be achieved. According to the specific embodiment of the invention, in the film-blowing breathable film, the unidirectional stretching process is adopted, the temperature of a stretching area is reduced and the stretching ratio is increased under the condition that the film is not stretched and broken or the film is not broken at the temperature close to the softening point of resin, so that uniform micropores are formed nearby the inorganic filler, the gram weight of the obtained film can be effectively reduced, and the water vapor transmission rate of a breathable film product is increased.
According to a specific embodiment of the present invention, the blown film breathable film preferably has a grammage of 13-25gsm, a film thickness of 15-30 μm, a moisture transmission capacity (room temperature) of 900-2The transverse tensile strength is 6-9MPa, the longitudinal tensile strength is 30-50MPa, the transverse elongation at break is 400-500%, and the longitudinal elongation at break is 35-55%.
Finally, the invention also provides application of the film-blowing breathable film in disposable hygienic products, medical products and health-care products.
In said application, according to a specific embodiment of the present invention, preferably, said disposable sanitary article comprises a sanitary napkin, a panty liner, a baby diaper, a diaper, an adult diaper.
In the application, according to the specific embodiment of the present invention, preferably, the medical product includes protective clothing and surgical clothing.
In said use, according to a particular embodiment of the invention, preferably, said health care product comprises a steam eye mask.
The film-blowing breathable film provided by the invention has the advantages of lower gram weight, smaller thickness, higher hydrostatic pressure resistance, higher tensile strength and higher longitudinal elongation at break under the condition of higher water vapor transmission rate (room temperature moisture permeability), is light, thin and soft, has higher use comfort and is relatively lower in cost.
Detailed Description
In order to clearly understand the technical features, objects and advantages of the present invention, the following detailed description of the technical solutions of the present invention will be made with reference to the following specific examples, which should not be construed as limiting the implementable scope of the present invention.
Example 1
The embodiment provides a film-blowing breathable film, wherein the film-blowing breathable film is prepared by adopting the following method:
(1) uniformly mixing the raw material composition for preparing the film blowing breathable film by adopting a double-screw mixing extruder;
the raw material composition for preparing the blown film breathable film comprises 55 percent of calcium carbonate powder of surface coating coupling agent stearic acid, 9.1 percent of linear low density polyethylene #1 and the density of the linear low density polyethylene #1 is 0.927g/cm based on the total weight of the raw material composition for preparing the blown film breathable film as 100 percent314.6% of linear low density polyethylene #2 having a melt index of 1.0g/10min at 190 ℃ and a density of 0.920g/cm3Melt index at 190 ℃ of 1.0g/10min, 20% of linear low density polyethylene #3 having a density of 0.918g/cm3The melt finger distribution at 190 ℃ is 2.0g/10 min; 0.15% of primary antioxidant IRGANOX 1010, 0.15% of secondary antioxidant IRGAFOS 168 and 1% of PPA;
the length-diameter ratio of the double-screw mixing extruder is 56, the number of the barrel sections is 14, the diameter of the screw is 75mm, and the double-screw mixing extruder is provided with a main feeding port, a first side feeding system and a second side feeding system; the first side feeding system and the second side feeding system are respectively arranged at the seventh section of the cylinder body and the tenth section of the cylinder body;
specifically, the step (1) specifically includes the steps of:
adding the components except the inorganic filler with the surface coated with the coupling agent and part of the inorganic filler with the surface coated with the coupling agent in the raw material composition for preparing the film-blowing breathable film into a double-screw mixing extruder through the main feeding port, and adding the other part of the inorganic filler with the surface coated with the coupling agent into the double-screw mixing extruder through a first side feeding system and a second side feeding system respectively;
wherein the weight ratio of the inorganic filler which is added into the double-screw mixing extruder through the main feeding port, the first side feeding system and the second side feeding system and is coated with the coupling agent on the surface is 1:1: 1;
in the step (1), the temperature of a charging section of the double-screw mixing extruder is 170 ℃, the temperature of a melting section is 230 ℃, the temperature of a homogenizing section is 210 ℃, and the temperature of a die head section is 240 ℃;
(2) extruding a product obtained after uniformly mixing by adopting a single-screw extruder; the length-diameter ratio of the single screw extruder is 9, the diameter of the screw is 200mm, and the working temperature is 240 ℃;
(3) then carrying out water ring-cutting granulation to obtain master batches of the film-blowing breathable film;
(4) drying the master batch of the obtained film-blowing breathable film, blowing the dried master batch of the film-blowing breathable film into a film by adopting an upward blowing film method, and then performing unidirectional stretching on the film to obtain the film-blowing breathable film, namely a film A;
in the step (4), the temperature of the unidirectional stretching is 100 ℃, the blow-up ratio is 3.1, and the unidirectional stretching ratio is 4.0.
The film thickness, grammage, moisture permeability (room temperature), tensile strength, elongation at break, and the like of the film a were measured by a method conventional in the art, and specific experimental data obtained in this example are shown in table 1 below.
Example 2
The embodiment provides a film-blowing breathable film, wherein the film-blowing breathable film is prepared by adopting the following method:
(1) uniformly mixing the raw material composition for preparing the film blowing breathable film by adopting a double-screw mixing extruder;
the raw material composition for preparing the blown film breathable film comprises 55 percent of calcium carbonate powder of surface coating coupling agent stearic acid, 29.1 percent of linear low density polyethylene #1 and the density of the linear low density polyethylene #1 is 0.927g/cm based on the total weight of the raw material composition for preparing the blown film breathable film as 100 percent314.6% of linear low density polyethylene #2 having a melt index of 1.0g/10min at 190 ℃ and a density of 0.920g/cm3The melt index at 190 ℃ is 1.0g/10 min; 0.4% of primary antioxidant IRGANOX 1010, 0.4% of secondary antioxidant IRGAFOS 168 and 1.5% of PPA;
the length-diameter ratio of the double-screw mixing extruder is 56, the number of the barrel sections is 14, the diameter of the screw is 75mm, and the double-screw mixing extruder is provided with a main feeding port, a first side feeding system and a second side feeding system; the first side feeding system and the second side feeding system are respectively arranged at the seventh section of the cylinder body and the tenth section of the cylinder body;
specifically, the step (1) specifically includes the steps of:
adding the components except the inorganic filler with the surface coated with the coupling agent and part of the inorganic filler with the surface coated with the coupling agent in the raw material composition for preparing the film-blowing breathable film into a double-screw mixing extruder through the main feeding port, and adding the other part of the inorganic filler with the surface coated with the coupling agent into the double-screw mixing extruder through a first side feeding system and a second side feeding system respectively;
wherein the weight ratio of the inorganic filler which is added into the double-screw mixing extruder through the main feeding port, the first side feeding system and the second side feeding system and is coated with the coupling agent on the surface is 1:1: 1;
in the step (1), the temperature of a charging section of the double-screw mixing extruder is 170 ℃, the temperature of a melting section is 230 ℃, the temperature of a homogenizing section is 210 ℃, and the temperature of a die head section is 240 ℃;
(2) extruding a product obtained after uniformly mixing by adopting a single-screw extruder; the length-diameter ratio of the single screw extruder is 9, the diameter of the screw is 200mm, and the working temperature is 240 ℃;
(3) then carrying out water ring-cutting granulation to obtain master batches of the film-blowing breathable film;
(4) drying the master batch of the obtained film-blowing breathable film, blowing the dried master batch of the film-blowing breathable film into a film by adopting an upward blowing film method, and then performing unidirectional stretching on the film to obtain the film-blowing breathable film, namely a film B;
in the step (4), the temperature of the unidirectional stretching is 100 ℃, the blow-up ratio is 3.1, and the unidirectional stretching ratio is 4.0.
The film thickness, grammage, moisture permeability (room temperature), tensile strength, elongation at break, and the like of the film B were measured by a method conventional in the art, and specific experimental data obtained in this example are shown in table 1 below.
Example 3
The embodiment provides a film-blowing breathable film, wherein the film-blowing breathable film is prepared by adopting the following method:
(1) uniformly mixing the raw material composition for preparing the film blowing breathable film by adopting a double-screw mixing extruder;
the raw material composition for preparing the blown film breathable film comprises 50 percent of calcium carbonate powder of surface coating coupling agent stearic acid, 48.7 percent of linear low density polyethylene #4 and the density of the linear low density polyethylene #4 is 0.920g/cm based on the total weight of the raw material composition for preparing the blown film breathable film as 100 percent3The melt index at 190 ℃ is 1.0g/10 min; 0.1% of primary antioxidant IRGANOX 1010, 0.1% of secondary antioxidant IRGAFOS 168 and 1.1% of PPA;
the length-diameter ratio of the double-screw mixing extruder is 56, the number of the barrel sections is 14, the diameter of the screw is 75mm, and the double-screw mixing extruder is provided with a main feeding port, a first side feeding system and a second side feeding system; the first side feeding system and the second side feeding system are respectively arranged at the seventh section of the cylinder body and the tenth section of the cylinder body;
specifically, the step (1) specifically includes the steps of:
adding the components except the calcium carbonate powder with the surface coated with the coupling agent in the raw material composition for preparing the film-blowing breathable film into a double-screw mixing extruder through the main feeding port, and respectively adding the calcium carbonate powder with the surface coated with the coupling agent into the double-screw mixing extruder through a first side feeding system and a second side feeding system;
wherein the weight ratio of the calcium carbonate powder with the surface coated with the coupling agent, which is added into the double-screw mixing extruder through the first side feeding system and the second side feeding system, is 1: 1;
in the step (1), the temperature of a charging section of the double-screw mixing extruder is 170 ℃, the temperature of a melting section is 230 ℃, the temperature of a homogenizing section is 210 ℃, and the temperature of a die head section is 240 ℃;
(2) extruding a product obtained after uniformly mixing by adopting a single-screw extruder; the length-diameter ratio of the single screw extruder is 9, the diameter of the screw is 200mm, and the working temperature is 240 ℃;
(3) then carrying out water ring-cutting granulation to obtain master batches of the film-blowing breathable film;
(4) drying the master batch of the obtained film-blowing breathable film, blowing the dried master batch of the film-blowing breathable film into a film by adopting an upward blowing film method, and then performing unidirectional stretching on the film to obtain the film-blowing breathable film, namely a film C;
in the step (4), the temperature of the unidirectional stretching is 75 ℃, the blow-up ratio is 2.3, and the unidirectional stretching ratio is 3.2.
The film C was measured for film thickness, grammage, moisture permeability (room temperature), tensile strength, elongation at break, and the like by a method conventional in the art, and the specific experimental data obtained in this example are shown in table 1 below.
Example 4
The embodiment provides a film-blowing breathable film, wherein the film-blowing breathable film is prepared by adopting the following method:
(1) uniformly mixing the raw material composition for preparing the film blowing breathable film by adopting a double-screw mixing extruder;
the raw material composition for preparing the blown film breathable film comprises 55 percent of calcium carbonate powder of surface coating coupling agent stearic acid, 29.1 percent of linear low density polyethylene #1 and the density of the linear low density polyethylene #1 is 0.927g/cm based on the total weight of the raw material composition for preparing the blown film breathable film as 100 percent314.6% of linear low density polyethylene #2 having a melt index of 1.0g/10min at 190 ℃ and a density of 0.920g/cm3The melt index at 190 ℃ is 1.0g/10 min; 0.15% of primary antioxidant IRGANOX 1010, 0.15% of secondary antioxidant IRGAFOS 168 and 1% of PPA;
the length-diameter ratio of the double-screw mixing extruder is 56, the number of the barrel sections is 14, the diameter of the screw is 75mm, and the double-screw mixing extruder is provided with a main feeding port, a first side feeding system and a second side feeding system; the first side feeding system and the second side feeding system are respectively arranged at the seventh section of the cylinder body and the tenth section of the cylinder body;
specifically, the step (1) specifically includes the steps of:
adding the components except the inorganic filler with the surface coated with the coupling agent and part of the inorganic filler with the surface coated with the coupling agent in the raw material composition for preparing the film-blowing breathable film into a double-screw mixing extruder through the main feeding port, and adding the other part of the inorganic filler with the surface coated with the coupling agent into the double-screw mixing extruder through a first side feeding system and a second side feeding system respectively;
wherein the weight ratio of the inorganic filler which is added into the double-screw mixing extruder through the main feeding port, the first side feeding system and the second side feeding system and is coated with the coupling agent on the surface is 1:1: 1;
in the step (1), the temperature of a charging section of the double-screw mixing extruder is 170 ℃, the temperature of a melting section is 230 ℃, the temperature of a homogenizing section is 210 ℃, and the temperature of a die head section is 240 ℃;
(2) extruding a product obtained after uniformly mixing by adopting a single-screw extruder; the length-diameter ratio of the single screw extruder is 9, the diameter of the screw is 200mm, and the working temperature is 240 ℃;
(3) then carrying out water ring-cutting granulation to obtain master batches of the film-blowing breathable film;
(4) drying the master batch of the obtained film-blowing breathable film, blowing the dried master batch of the film-blowing breathable film into a film by adopting an upward blowing film method, and then performing unidirectional stretching on the film to obtain the film-blowing breathable film, namely a film D;
in the step (4), the temperature of the uniaxial tension is 100 ℃, the blow-up ratio is 3.1, and the uniaxial tension ratio is 3.7.
The film thickness, grammage, moisture permeability (room temperature), tensile strength, elongation at break, and the like of the film D were measured by a method conventional in the art, and specific experimental data obtained in this example are shown in table 1 below.
Example 5
The embodiment provides a film-blowing breathable film, wherein the film-blowing breathable film is prepared by adopting the following method:
(1) uniformly mixing the raw material composition for preparing the film blowing breathable film by adopting a double-screw mixing extruder;
the raw material composition for preparing the blown film breathable film comprises 55 percent of calcium carbonate powder of surface-coated coupling agent stearic acid and 29.1 percent of calcium carbonate powder by taking the total weight of the raw material composition as 100 percent% of linear low density polyethylene #1 having a density of 0.927g/cm314.6% of linear low density polyethylene #2 having a melt index of 1.0g/10min at 190 ℃ and a density of 0.920g/cm3The melt index at 190 ℃ is 1.0g/10 min; 0.15% of primary antioxidant IRGANOX 1010, 0.15% of secondary antioxidant IRGAFOS 168 and 1% of PPA;
the length-diameter ratio of the double-screw mixing extruder is 56, the number of the barrel sections is 14, the diameter of the screw is 75-100 mm, and the double-screw mixing extruder is provided with a main feeding port, a first side feeding system and a second side feeding system; the first side feeding system and the second side feeding system are respectively arranged at the seventh section of the cylinder body and the tenth section of the cylinder body;
specifically, the step (1) specifically includes the steps of:
adding the components except the inorganic filler with the surface coated with the coupling agent and part of the inorganic filler with the surface coated with the coupling agent in the raw material composition for preparing the film-blowing breathable film into a double-screw mixing extruder through the main feeding port, and adding the other part of the inorganic filler with the surface coated with the coupling agent into the double-screw mixing extruder through a first side feeding system and a second side feeding system respectively;
wherein the weight ratio of the inorganic filler which is added into the double-screw mixing extruder through the main feeding port, the first side feeding system and the second side feeding system and is coated with the coupling agent on the surface is 1:1: 1;
in the step (1), the temperature of a charging section of the double-screw mixing extruder is 170 ℃, the temperature of a melting section is 230 ℃, the temperature of a homogenizing section is 210 ℃, and the temperature of a die head section is 240 ℃;
(2) extruding a product obtained after uniformly mixing by adopting a single-screw extruder; the length-diameter ratio of the single screw extruder is 9, the diameter of the screw is 200mm, and the working temperature is 240 ℃;
(3) then carrying out water ring-cutting granulation to obtain master batches of the film-blowing breathable film;
(4) drying the master batch of the obtained film-blowing breathable film, blowing the dried master batch of the film-blowing breathable film into a film by adopting an upward blowing film method, and then performing unidirectional stretching on the film to obtain the film-blowing breathable film, namely a film E;
in the step (4), the temperature of the unidirectional stretching is 90 ℃, the blow-up ratio is 3.1, and the unidirectional stretching ratio is 3.7.
The film thickness, grammage, moisture permeability (room temperature), tensile strength, elongation at break, and the like of the film E were measured by a method conventional in the art, and specific experimental data obtained in this example are shown in table 1 below.
TABLE 1
Note: in Table 1, the commercial film 1 was a film product model NP50 manufactured by Jinfa science and technology Co., Ltd, and the commercial film 2 was a film product model HP-16 manufactured by Shandong Hengpeng sanitary goods Co., Ltd.
As can be seen from table 1, the film-blowing breathable film provided by the invention has a relatively low grammage, a relatively small thickness, a relatively high hydrostatic pressure resistance, a relatively high tensile strength and a relatively high longitudinal elongation at break under the condition of a relatively high water vapor transmission rate (room temperature moisture transmission), is a breathable film which is light, thin and flexible and has relatively high use comfort, and has a relatively low cost.
As can be seen from table 1, in example 1 of the present invention, the linear low density polyethylenes include 3 linear low density polyethylenes with different densities, and the blown film breathable film prepared from the linear low density polyethylenes has the best overall performance, i.e. the blown film breathable film has a lower gram weight, a higher tensile strength and a higher elongation at break under the condition of ensuring a higher moisture permeation amount;
in example 2 of the present invention, the linear low density polyethylene includes 2 linear low density polyethylenes with different densities, and compared with the blown film breathable film prepared in example 1, the blown film breathable film prepared by the method has higher moisture permeability, but has larger gram weight and relatively lower tensile strength and elongation at break;
in example 3 of the present invention, the linear low density polyethylene includes 1 linear low density polyethylene, and compared with the blown film breathable films prepared in examples 1 to 2, the blown film breathable film prepared by the method has poor moisture permeability and poor actual strength.
Comparing film B and film D with the experimental data in table 1, it is seen that film B has a smaller film thickness and a smaller grammage but a larger moisture permeability and a larger tensile strength and elongation at break (particularly, elongation at break in the machine direction) because the uniaxial stretch ratio (4.0) in the production of film B is larger.
In combination with the experimental data in table 1, comparing film D and film E, it is understood that since the temperature of uniaxial stretching controlled when film D is produced is high, the film thickness of film D is smaller, the grammage is smaller, and the moisture permeability thereof is significantly reduced, and at the same time, the tensile strength (particularly, the machine direction tensile strength) and the elongation at break (particularly, the machine direction elongation at break) thereof are also reduced.
The above description is only exemplary of the invention and should not be taken as limiting the scope of the invention, so that the invention is intended to cover all modifications and equivalents of the embodiments described herein.
In addition, the technical features and the technical inventions of the present invention, the technical features and the technical inventions, and the technical inventions can be freely combined and used.
Claims (23)
1. A raw material composition for preparing a film-blowing breathable film is characterized by comprising 50-70% of inorganic filler coated with a coupling agent on the surface, 25-50% of linear low-density polyethylene and 0.2-1.0% of antioxidant, wherein the total weight of the raw material composition for preparing the film-blowing breathable film is 100%;
wherein the linear low density polyethylene comprises 3 kinds of linear low density polyethylene with different densities, and the density distribution of the linear low density polyethylene with different densities is 0.910g/cm3To 0.935g/cm3The melt finger distribution at 190 ℃ is 2.5-0.5g/10 min;
the linear low density polyethylene of different densities is selected as follows:
the melting index of the linear low-density polyethylene with higher density is less than or equal to that of the linear low-density polyethylene with lower density;
the antioxidant comprises a main antioxidant and an auxiliary antioxidant; the total weight of the raw material composition for preparing the blown film breathable film is 100%, the dosage of the main antioxidant is 0.1-0.5%, and the dosage of the auxiliary antioxidant is 0.1-0.5%.
2. The raw material composition of claim 1, comprising 50-70% of inorganic filler coated with coupling agent, 25-50% of linear low density polyethylene, 0.2-1.0% of antioxidant, and 0.1-3.0% of other processing aids, based on 100% of the total weight of the raw material composition for preparing blown film breathable film.
3. The feedstock composition of claim 2, wherein said other processing aid comprises PPA.
4. A feedstock composition according to any one of claims 1 to 3, wherein the linear low density polyethylene of each different density is present in an amount ranging from 20% to 60% based on the total weight of the linear low density polyethylene taken as 100%.
5. A feedstock composition according to any one of claims 1 to 3,
the inorganic filler comprises one or a combination of more of calcium carbonate, silicon dioxide and fly ash;
the coupling agent comprises one or more of stearic acid, titanate, aluminate, silane and phosphate.
6. The feed composition of claim 5, wherein the calcium carbonate is ground calcium carbonate and has a powder particle size of 50% or more distributed over 1-2 microns.
7. A feedstock composition according to any one of claims 1 to 3, characterised in that said linear low density polyethylenes of different densities include, but are not limited to, metallocene polyethylenes.
8. The master batch for the film-blowing breathable film is characterized by being prepared from the raw material composition for preparing the film-blowing breathable film according to any one of claims 1 to 7.
9. The preparation method of the master batch for the film-blowing breathable film, according to claim 8, is characterized by comprising the following steps:
(1) uniformly mixing the raw material composition for preparing the film-blowing breathable film, which is disclosed by any one of claims 1 to 7, by using a twin-screw mixing extruder;
(2) extruding a product obtained after uniformly mixing by adopting a single-screw extruder;
(3) and performing water ring-cutting granulation to obtain master batches of the film-blowing breathable film.
10. The preparation method as claimed in claim 9, wherein in the step (1), the temperature of the feeding section of the twin-screw mixing extruder is 140-.
11. The method as claimed in claim 9, wherein the single-screw extruder is operated at 180-240 ℃ in the step (2).
12. The method as claimed in claim 9, wherein the twin-screw mixing extruder has a length-diameter ratio of 48 to 56, a barrel pitch of 12 to 14, and a screw diameter of 75mm to 100 mm.
13. The method as claimed in claim 9, wherein the single screw extruder has a length/diameter ratio of 5-9 and a screw diameter of 150-250 mm.
14. The manufacturing method according to any one of claims 9 to 13, wherein the twin-screw compounding extruder is provided with a main feeding port and a first side feeding system and a second side feeding system.
15. The preparation method according to claim 14, wherein the preparation method step (1) specifically comprises the steps of:
adding the components except the inorganic filler coated with the coupling agent to the raw material composition for preparing the film-blowing breathable film, which is described in any one of claims 1 to 7, into a double-screw mixing extruder through the main feeding port, and adding the inorganic filler coated with the coupling agent to the double-screw mixing extruder through a first side feeding system and a second side feeding system respectively;
or;
the components of the raw material composition for preparing blown film breathable films, except the inorganic filler with the surface coated with the coupling agent, of any one of claims 1 to 7 and the inorganic filler with a part of the surface coated with the coupling agent are added into the twin-screw mixing extruder through the main feeding port, and the other part of the inorganic filler with the surface coated with the coupling agent is added into the twin-screw mixing extruder through the first side feeding system and the second side feeding system respectively.
16. The method as claimed in claim 15, wherein the inorganic filler of the surface-coated coupling agent is fed into the twin-screw compounding extruder through the first side-feeding system and the second side-feeding system in a weight ratio of 2:3 to 3: 2.
17. The method as claimed in claim 15, wherein the inorganic filler of the surface-coated coupling agent is added to the twin-screw compounding extruder through the main feeding port, the first side feeding system and the second side feeding system in an amount of 20 to 80 wt%, 30 to 60 wt% and 30 to 60 wt%, respectively, based on 100 wt% of the total weight of the inorganic filler of the surface-coated coupling agent.
18. A film-blowing breathable film, which is characterized in that the film-blowing breathable film is obtained by blowing master batches of the film-blowing breathable film according to claim 8 into a film by an up-blowing method and then performing unidirectional stretching on the film;
the gram weight of the film-blowing breathable film is 13-25gsm, the film thickness is 15-30 mu m, and the moisture permeability is 900-2The transverse tensile strength is 6-9MPa, the longitudinal tensile strength is 30-50MPa, the transverse elongation at break is 400-500%, and the longitudinal elongation at break is 35-55%.
19. The blown film breathable film of claim 18, wherein the temperature of the unidirectional stretching is from 70 ℃ to 100 ℃, the blow-up ratio is from 2.3 to 3.7, and the unidirectional stretching ratio is from 3.0 to 4.5.
20. Use of the blown film breathable film of claim 18 or 19 in disposable hygiene products, medical products and health care products.
21. The use of claim 20, wherein the disposable hygiene article comprises a sanitary napkin, panty liner, diaper, panty liner.
22. The use of claim 20, wherein the medical products comprise protective clothing and surgical clothing.
23. The use of claim 20, wherein the health product comprises a steam eye mask.
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| CN110483868A (en) * | 2019-08-30 | 2019-11-22 | 重庆和泰润佳股份有限公司 | A kind of permeable resin and high-elongation are blow molded ventilated membrane |
| CN111040279B (en) * | 2019-12-27 | 2021-12-24 | 上海紫华薄膜科技有限公司 | Preparation method of polyolefin microporous breathable film |
| CN111909430A (en) * | 2020-07-16 | 2020-11-10 | 山东恒鹏卫生用品有限公司 | Breathable film composite material applied to medical protective clothing |
| CN111806026B (en) * | 2020-07-21 | 2021-11-23 | 江门市华龙膜材股份有限公司 | Disposable medical wrist strap film and preparation method thereof |
| CN112143079B (en) * | 2020-09-25 | 2023-07-11 | 福建琦峰科技有限公司 | Antibacterial breathable film and preparation method thereof |
| CN112126200B (en) * | 2020-09-25 | 2022-12-06 | 福建琦峰科技有限公司 | Degradable breathable film and preparation method thereof |
| CN113861548A (en) * | 2021-09-24 | 2021-12-31 | 会通新材料股份有限公司 | High-strength wear-resistant PE (polyethylene) breathable film composite material and preparation method thereof |
| CN113910588B (en) * | 2021-10-29 | 2023-08-15 | 泉州市环球新材料科技有限公司 | Production process of double-color breathable film with anti-counterfeiting effect |
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