TWI804826B - Polypropylene composite film and manufacturing method thereof and sanitary product including polypropylene composite film - Google Patents

Abstract

A polypropylene composite film includes a polypropylene non-woven fabric and a polypropylene film. The polypropylene film is disposed on the polypropylene non-woven fabric and attached with the polypropylene non-woven fabric by an ultrasonic bonding technology, wherein an ultrasonic frequency of the ultrasonic bonding technology is about 20KHz to about 50KHz.

Description

Polypropylene composite film, manufacturing method thereof, and hygienic articles containing polypropylene composite film

This disclosure is about a polypropylene composite film and its manufacturing method and sanitary products containing the polypropylene composite film, especially about a polypropylene composite film manufactured by ultrasonic bonding technology and its manufacturing method and the polypropylene composite film containing the polypropylene composite film Composite film hygiene products.

Since the advent of disposable and disposable absorbent hygiene products, such as baby diapers, adult diapers, sanitary napkins, panty liners and breast pads, users of all ages around the world have enjoyed the benefits they bring. Advantages, such as: cheap, easy to carry, easy to use, non-staining to clothes, disposable after use, etc., overcome the shortcomings of traditional cloth absorbent articles that can be reused but must be washed to remove dirt.

However, used absorbent hygienic articles generate a large amount of waste, which is not conducive to environmental protection. For example, the world produces about 6,000 metric tons of disposable diapers every day, while Taiwan produces about 2 million discarded diapers every day. Moreover, as the global population tends to age, the consumption of adult diapers is increasing day by day.

Used absorbent hygienic articles are stained with solid or liquid dirt from the human body such as feces, urine, body fluid or menstrual blood, and these absorbent hygienic articles usually contain liquid dirt locked into the absorbent layer. Since the absorbent hygienic articles are made of chemical materials that are not easy to decompose, and the weight increases significantly after use, the difficulty of cleaning and transportation of the absorbent hygienic articles is increased. For example, absorbent hygienic articles containing moisture are difficult to burn in an incinerator, and even lead to early maintenance of the incinerator and a shortened lifespan. They are still difficult to decompose and still contain moisture for a long time when buried in landfills. In addition, absorbent hygienic articles themselves are dirty and smelly, so that the industry has no incentive to recycle used absorbent hygienic articles. Therefore, most of the used absorbent hygienic articles do not enter the recycling system, but are processed in incinerators or landfills as general waste.

However, there is a need to develop a method capable of recycling these absorbent hygienic articles for environmental reasons. However, these hygienic articles often contain a variety of plastics, such as polyethylene and polypropylene, which are not conducive to recycling and are not conducive to circular economy.

In view of the above, there is an urgent need to develop a film layer that can be applied to hygienic articles to overcome the above problems.

The disclosure provides a polypropylene composite film, which includes a polypropylene non-woven fabric and a polypropylene film. The polypropylene film is placed on the polypropylene non-woven fabric, and the polypropylene film and the polypropylene non-woven fabric are bonded to each other by ultrasonic bonding technology, wherein the ultrasonic frequency of the ultrasonic bonding technology is about 20KHz to about 50KHz.

In some embodiments, the polypropylene composite film has an air permeability greater than or equal to about 500 L/m ² /S.

In some embodiments, the polypropylene composite membrane has a net water pressure resistance of greater than or equal to about 550 _mmH2O .

In some embodiments, the polypropylene composite film further includes an antibacterial agent in the polypropylene film, the polypropylene film contains about 1000 parts by weight, and the antibacterial agent contains about 1 part by weight to about 100 parts by weight.

In some embodiments, the polypropylene composite film has an antimicrobial potency of greater than or equal to about 85%.

In some embodiments, the antimicrobial agent includes quaternary ammonium salts, quaternary ammonium salt polymers, inorganic salts, or combinations thereof.

In some embodiments, the antimicrobial agent includes triisodecylmethylammonium chloride, chitin, nanosilver, nanozinc, or a combination thereof.

In some embodiments, the upper surface of the polypropylene film has flow-guiding embossments, and the shapes of the flow-guiding embossments include T-shape, U-shape, V-shape, I-shape, net shape, continuous wave shape or combinations thereof.

In some embodiments, the polypropylene composite film has a longitudinal tensile strength greater than or equal to about 130 MPa.

In some embodiments, the transverse direction tensile strength of the polypropylene composite film is greater than or equal to about 220 MPa.

In some embodiments, the polypropylene composite film has an elongation at break in the machine direction of greater than or equal to about 165%.

In some embodiments, the polypropylene composite film has an elongation at break in the transverse direction of greater than or equal to about 55%.

In some embodiments, the polypropylene film has a thickness of about 10 μm to about 30 μm.

The present disclosure provides a hygienic article, comprising the polypropylene composite film of any one of the aforementioned embodiments.

In some embodiments, the hygiene article is a diaper, a diaper, a sanitary napkin, a panty liner, a breast pad, or a cleansing pad.

The disclosure provides a method for manufacturing a polypropylene composite film, which includes the following steps. Melt and plasticize the polypropylene masterbatch. The melt-plasticized polypropylene masterbatch is made into cast sheets. The cast sheet was stretched to form a polypropylene film. The polypropylene film and the polypropylene non-woven fabric are bonded to each other by means of ultrasonic bonding technology, wherein the ultrasonic frequency of the ultrasonic bonding technology is about 20KHz to about 50KHz.

In some embodiments, stretching the cast sheet to form the polypropylene film comprises: longitudinally stretching the cast sheet at a temperature of from about 100°C to about 150°C. The cast sheet is stretched transversely at a temperature of from about 140°C to about 180°C.

In some embodiments, the manufacturing method further includes heat setting the polypropylene film at a temperature of about 60°C to about 100°C after stretching the cast sheet to form the polypropylene film.

In some embodiments, the manufacturing method further includes mixing the polypropylene masterbatch and the antibacterial agent before melting and plasticizing the polypropylene masterbatch.

In some embodiments, the manufacturing method further includes forming flow-guiding embossments on the upper surface of the polypropylene film.

These and other features, characteristics, and advantages of the present disclosure may be better understood with reference to the following description and appended claims. It is to be understood that both the foregoing general description and the following specific description are exemplary and explanatory only and are intended to provide further explanation of the disclosure as claimed.

Herein, a range indicated by "one value to another value" is a general representation which avoids enumerating all values in the range in the specification. Therefore, the description of a specific numerical range covers any numerical value in the numerical range and the smaller numerical range bounded by any numerical value in the numerical range, as if the arbitrary numerical value and the smaller numerical value are expressly written in the specification. same range.

As used herein, "about," "approximately," "essentially," or "essentially" includes the stated value and averages within acceptable deviations from the particular value as determined by one of ordinary skill in the art, taking into account the The measurement and the specific amount of error associated with the measurement (ie, the limits of the measurement system). For example, "about" can mean within one or more standard deviations of the stated value, or for example within ±30%, ±20%, ±15%, ±10%, ±5%. Furthermore, "about", "approximately", "essentially" or "substantially" used herein can choose a more acceptable deviation range or standard deviation according to measurement properties, coating properties or other properties, and can be Not one standard deviation applies to all properties.

Although a series of operations or steps are used to illustrate the methods disclosed herein, the order of these operations or steps should not be construed as a limitation of the present disclosure. For example, certain operations or steps may be performed in a different order and/or concurrently with other steps. In addition, not all illustrated operations, steps and/or features must be performed to implement an implementation of the present disclosure. Furthermore, each operation or step described herein may contain several sub-steps or actions.

The disclosure provides a polypropylene composite film, which includes a polypropylene non-woven fabric and a polypropylene film. The polypropylene film is placed on the polypropylene non-woven fabric, and the polypropylene film and the polypropylene non-woven fabric are bonded to each other by ultrasonic bonding technology, wherein the ultrasonic frequency of the ultrasonic bonding technology is about 20KHz to about 50KHz. The polypropylene composite film disclosed in this disclosure has excellent air permeability, flexibility, anti-leakage effect and high strength, so it can be used as a film layer in sanitary products. In some embodiments, the hygienic product is diapers, diapers, sanitary napkins, panty liners, breast pads or cleaning pads, but not limited thereto.

In the ultrasonic bonding process, no additional adhesive is required, and the production process is simple. Therefore, the polypropylene composite film disclosed in this disclosure is a relatively environmentally friendly adhesive-free composite film. In addition, the properties of the polypropylene composite film can be adjusted by changing the value of the ultrasonic frequency. For example, the ultrasonic frequency can be 20, 25, 30, 35, 40, 45 or 50 KHz. When the ultrasonic frequency is above about 50KHz or below about 20KHz, poor fit may occur.

In some embodiments, the polypropylene composite film has an air permeability greater than or equal to about 500 L/m ² /S. For example, the air permeability is about 500, 510, 520, 530, 540, 550, 560, 570, 580, 590 or 600 L/m ² /S. In some embodiments, the polypropylene composite membrane has a net water pressure resistance of greater than or equal to about 550 _mmH2O . For example, the resistance to clean water pressure is about 550, 560, 570 or 580 _mmH2O . It can be seen that the polypropylene composite film has excellent air permeability and resistance to clean water pressure (that is, water resistance), and is suitable for use as a film layer in sanitary products, which can bring users a comfortable experience while avoiding liquid leakage.

In some embodiments, the polypropylene composite film has a longitudinal tensile strength greater than or equal to about 130 MPa. For example, the longitudinal tensile strength is about 130, 140, 150 or 160 MPa. In some embodiments, the transverse direction tensile strength of the polypropylene composite film is greater than or equal to about 220 MPa. For example, the transverse tensile strength is about 220, 230, 240, 250, 260 or 270 MPa. It can be seen that the polypropylene composite film has high strength and is suitable as a film layer in sanitary products.

In some embodiments, the polypropylene composite film has an elongation at break in the machine direction of greater than or equal to about 165%. For example, the MD elongation at break is about 165, 170, 175, 180, 185, 190, 195, or 200%. In some embodiments, the polypropylene composite film has an elongation at break in the transverse direction of greater than or equal to about 55%. For example, the elongation at break in the transverse direction is about 55, 60, 65, 70, 75, 80, 85, 90, or 95%.

In some embodiments, the polypropylene film has a thickness of about 10 μm to about 30 μm. In some embodiments, the polypropylene film in the polypropylene composite film is a biaxially oriented polypropylene film (BOPP film), so it is light and thin, non-toxic, odorless, moisture-proof, high strength, good dimensional stability, Good transparency and other advantages. Moreover, because the BOPP film is an integrally formed film, compared with the fiber film, the BOPP film has better air permeability and strength, and is suitable for sanitary products.

In some embodiments, the polypropylene film has an air permeability greater than or equal to about 460 L/m ² /S. For example, the air permeability is about 460, 470, 480, 490, 500, 510, 520, 530, 540, 550 or 560 L/m ² /S. In some embodiments, the polypropylene membrane has a net water pressure resistance of greater than or equal to about 510 _mmH2O . For example, the resistance to clean water pressure is about 510, 520, 530, 540, 550, 560, 570, 580, 590, 600, 610 or 620 _mmH2O . It can be seen that the polypropylene film has excellent air permeability and resistance to clean water pressure (that is, water resistance), and is suitable as a film layer in sanitary products, which can bring users a comfortable experience while avoiding liquid seepage. leak.

In some embodiments, the polypropylene film has a machine direction tensile strength greater than or equal to about 80 MPa. For example, the longitudinal tensile strength is about 80, 90, 100, 110, 120 or 130 MPa. In some embodiments, the polypropylene film has a transverse tensile strength greater than or equal to about 150 MPa. For example, the transverse tensile strength is about 150, 160, 170, 180, 190, 200 or 210 MPa. It can be seen that the polypropylene film has high strength and is suitable as a film layer in sanitary products.

In some embodiments, the polypropylene film has a MD elongation at break of greater than or equal to about 90%. For example, the MD elongation at break is about 90, 100, 110, 120, 130, 140, 150, 160, 170, or 180%. In some embodiments, the polypropylene film has an elongation at break in the transverse direction of greater than or equal to about 30%. For example, the elongation at break in the transverse direction is about 30, 35, 40, 45, 50, 55, 60, or 65%.

In order to further improve the performance of the polypropylene composite film, in some embodiments, the polypropylene composite film further includes an antibacterial agent in the polypropylene film, the polypropylene film is about 1000 parts by weight, and the antibacterial agent is about 1 part by weight to about 100 parts by weight share. Preferably, the polypropylene film is about 1000 parts by weight, and the antimicrobial agent is about 1 to about 10 parts by weight. In some embodiments, the polypropylene composite film has an antimicrobial potency of greater than or equal to about 85%. For example, the antimicrobial potency is about 85, 90, 95, 96, 97 or 98%. When the polypropylene composite film is used in sanitary products, the antibacterial agent can be used to prevent bacteria and viruses from urine or feces from diffusing out of the composite film through ventilation, causing secondary infection problems.

In some embodiments, the antimicrobial agent includes quaternary ammonium salts, quaternary ammonium salt polymers, inorganic salts, or combinations thereof. Quaternary ammonium salts such as tetramethylammonium chloride, dimethyldiethylammonium chloride, dimethyldiisopropylammonium chloride, methyltriisopropylammonium chloride, trimethylisopropylammonium chloride Propylammonium, Diisodecyldimethylammonium Chloride, Triisobutylmethylammonium Chloride, or Triisodecylmethylammonium Chloride. Quaternary ammonium salt polymers such as polydimethyldi-2-propenyl ammonium chloride, polytrimethyl-2-acryloyl-ethylammonium chloride, polyacrylic acid-chloride dimethyldi-2- Acryl ammonium copolymer, poly-(formyl acrylate)-(dimethyldi-2(-propenyl) ammonium chloride) copolymer, poly-(acrylic acid)-(trimethyl 2-(propylene chloride) Acyl) ethyl ammonium) copolymer, poly-(formyl acrylate)-(trimethyl 2-acryl ethyl ammonium chloride copolymer, poly-(dimethyl di-2-propenyl chloride Ammonium chloride or trimethyl-2-acryloylethylammonium copolymer. Inorganic salts are, for example, chitin, nanosilver or nanozinc. In some embodiments, the antibacterial agent includes triisodecylmethyl chloride ammonium, chitin, nano-silver, nano-zinc or a combination thereof.

In order to further improve the performance of the polypropylene composite film, in some embodiments, the upper surface of the polypropylene film has diversion embossing. In some embodiments, the shape of the diversion embossment includes T-shape, U-shape, V-shape, I-shape, mesh shape, continuous wave shape or a combination thereof. When the polypropylene composite film is used in sanitary products, such as diapers, diapers or sanitary napkins, the diversion embossing can improve the conductivity of the composite film, which can be used to assist the diffusion of liquid when it reaches the composite film, thereby improving the liquid resistance of the composite film. of absorbency.

The present disclosure provides a hygienic article, comprising the polypropylene composite film of any one of the aforementioned embodiments. In some embodiments, the hygiene article is a diaper, a diaper, a sanitary napkin, a panty liner, a breast pad, or a cleansing pad. For example, polypropylene composite films can be used as the back film of diapers or diapers. Diapers generally comprise a topsheet facing the wearer's body, a backsheet facing the wearer's garment, and an absorbent core sandwiched between the topsheet and backsheet. The surface layer and the absorbent core are often made of polypropylene, and the bottom film is often made of polyethylene film as the waterproof layer. Because the polypropylene composite film of this disclosure has excellent air permeability, softness and anti-leakage effect, it can replace polyethylene film as the bottom film of diapers or diapers, and the polypropylene composite film is conducive to the production of all polypropylene Material diapers or diapers. Therefore, the main material of diapers or diapers is polypropylene, which is conducive to the recycling of diapers or diapers after subsequent use. The recycled plastic has high economic value. In addition, for diaper or diaper production plants, only part of the raw materials (bottom film) need to be replaced during the production process, and there is no need to purchase additional equipment to increase production costs.

The disclosure provides a method for manufacturing a polypropylene composite film, which includes the following steps. Melt and plasticize the polypropylene masterbatch. The melt-plasticized polypropylene masterbatch is made into cast sheets. The cast sheet was stretched to form a polypropylene film. The polypropylene film and the polypropylene non-woven fabric are bonded to each other by means of ultrasonic bonding technology, wherein the ultrasonic frequency of the ultrasonic bonding technology is about 20KHz to about 50KHz. In some embodiments, the melt index (Melt flow index, MI) of the polypropylene masterbatch is 3 g/10 minutes.

In some embodiments, stretching the cast sheet to form the polypropylene film comprises: longitudinally stretching the cast sheet at a temperature of from about 100°C to about 150°C. The cast sheet is stretched transversely at a temperature of from about 140°C to about 180°C. For example, the longitudinal stretching is carried out at a temperature of 100, 110, 120, 130, 140 or 150°C. Preferably, the temperature is from about 100°C to about 120°C. For example, the temperature for transverse stretching is 140, 150, 160, 170 or 180°C. Preferably, the temperature is from about 140°C to about 160°C. In some embodiments, the longitudinal stretching factor is about 2 to about 7 times, such as 2, 3, 4, 5, 6 or 7 times. Preferably, the multiple is from about 2 to about 5 times. In some embodiments, the transverse stretching ratio is about 7 to about 10 times, such as 7, 8, 9 or 10 times. Preferably, the multiple is from about 7 to about 9 times. Stretching at the above temperature and multiples can obtain a polypropylene film with a suitable thickness. This polypropylene film has good strength, air permeability and resistance to clean water pressure, and is suitable as a film layer in sanitary products.

In some embodiments, the manufacturing method further includes heat setting the polypropylene film at a temperature of about 60°C to about 100°C after stretching the cast sheet to form the polypropylene film. For example, the temperature is 60, 70, 80, 90 or 100°C. Preferably, the temperature is from about 80°C to about 100°C.

In some embodiments, the manufacturing method further includes mixing the polypropylene masterbatch and the antibacterial agent before melting and plasticizing the polypropylene masterbatch. In some embodiments, the polypropylene masterbatch is about 1000 parts by weight, and the antibacterial agent is about 1 part by weight to about 100 parts by weight. Preferably, the polypropylene masterbatch is about 1000 parts by weight, and the antibacterial agent is about 1 to about 10 parts by weight.

In some embodiments, the manufacturing method further includes forming flow-guiding embossments on the upper surface of the polypropylene film. In some embodiments, the flow-inducing embossment can be imprinted on the polypropylene film by an embossing roller. For example, the shape of the embossing roller includes T-shape, U-shape, V-shape, I-shape, mesh shape, continuous wave shape or combinations thereof.

Experimental example 1: Manufacture of biaxially oriented polypropylene (BOPP) film Please refer to Table 1 below for the experimental conditions of Examples 1 to 15 and Comparative Examples 1 to 3. The manufacturing process of the BOPP film of embodiment 1 is as follows: (a) mixing polypropylene masterbatch. (b) Add the material to the extruder and melt and plasticize it at 200°C. (c) The melted and plasticized materials are extruded at the T-shaped die to meet, cooled, and cast. (d) After the cast sheet is heated and kept warm, the cast sheet is stretched longitudinally and transversely to form a film with a thickness of 10 μm. The longitudinal stretching temperature is 120° C., and the stretching ratio is 5. The temperature is 150°C and the draw ratio is 9. (e) At 90 °C, the film was heat-set with insulation. (f) After the film is cooled, drawn and wound, the BOPP film is obtained. The manufacturing processes of Examples 2 and 3 are similar to those of Example 1, the difference lies in the different experimental conditions. The manufacturing process of Examples 4 to 6 is similar to that of Example 2, the difference is that in Step (a) of Examples 4 to 6, the antibacterial agent triisodecylmethylammonium chloride is further added and mixed with the polypropylene masterbatch. The manufacturing process of Examples 7 to 9 is similar to that of Example 2, the difference is that in Step (a) of Examples 7 to 9, the antimicrobial agent chitin is further added and mixed with polypropylene masterbatch. The manufacturing process of Examples 10 to 12 is similar to that of Example 2, the difference is that in Step (a) of Examples 10 to 12, an antibacterial agent nano-silver powder is further added and mixed with polypropylene masterbatch. The manufacturing process of Examples 13 to 15 is similar to that of Example 2, the difference is that in Step (a) of Examples 13 to 15, an antibacterial agent nano-zinc powder is further added and mixed with polypropylene masterbatch. The manufacturing process of Comparative Examples 1 and 2 is similar to that of Example 1, the difference lies in the different experimental conditions. Comparative example 3 uses the manufacturing method described in the patent CN101824177 "A special antibacterial PE (polyethylene) cling film" to produce a polyethylene (Polyethylene, PE) film with a film thickness of 20 μm. The antibacterial agent of the antibacterial polyethylene masterbatch is replaced by triisodecylmethylammonium chloride, the polyethylene masterbatch is 1000 parts by weight, and the antibacterial agent triisodecylmethylammonium chloride is 1 part by weight.

The physical properties of the BOPP films of the above-mentioned examples and comparative examples were tested. For the analysis items, units and analysis methods of the BOPP film in this disclosure, please refer to Table 2 below, where the antibacterial ability is the antibacterial ability against Escherichia coli. Please refer to Table 3 below for the physical property test results. The physical property analysis method of PE film and PP film is the same.

table 3 BOPP film Gram weight (gsm) Longitudinal tensile strength (Mpa) Transverse tensile strength (Mpa) Longitudinal elongation at break (%) Transverse elongation at break (%) Air permeability (L/m ² /S) Antibacterial power (%) Anti-water pressure (mmH ₂ O) Example 1 9.5 80 150 90 30 550 0 510 Example 2 16.5 110 190 160 55 500 0 560 Example 3 24.5 120 200 170 60 460 0 610 Example 4 16.4 105 155 95 58 510 88 550 Example 5 16.3 108 158 97 54 520 95 545 Example 6 16.2 115 192 165 56 524 90 542 Example 7 16.3 110 159 96 52 522 91 544 Example 8 16.6 111 192 161 56 503 97 558 Example 9 16.2 113 190 164 55 525 92 546 Example 10 16.1 114 189 162 54 526 87 540 Example 11 16.3 110 157 94 55 524 98 547 Example 12 16.2 112 191 162 54 527 93 545 Example 13 16.5 115 190 158 58 505 89 560 Example 14 16.1 113 189 161 53 527 96 541 Example 15 16.2 112 191 162 54 529 93 545 Comparative example 1 6.9 60 100 50 10 610 0 450 Comparative example 2 33.9 150 220 185 70 420 0 670 Comparative example 3 16.0 72 106 170 62 506 88 501

Please refer to Table 1 and Table 3. From Examples 1 to 3, it can be seen that when the thickness of the BOPP film is 10 to 30 μm, the BOPP film can have sufficient air permeability and strength, and 20 μm is the optimum thickness. From Example 4 to Example 15, it can be seen that when the polypropylene masterbatch is 1000 parts by weight and the antibacterial agent is 5 parts by weight or more, the BOPP film has excellent antibacterial ability. It can be known from Comparative Example 1 and Comparative Example 2 that when the BOPP film falls outside the range of 10 μm to 30 μm, the BOPP film that is too thick or too thin may not meet the user’s needs for air permeability and strength. It can be seen from Comparative Example 3 that compared with polyethylene film, the BOPP films of Examples 1 to 15 have better longitudinal tensile strength, transverse tensile strength and water pressure resistance, and have higher or similar to polyethylene film. Breathability, and it is enough to prove that BOPP film is sufficient to replace polyethylene film as the film layer of hygiene products.

Experimental example 2: Manufacture of polypropylene composite film

The polypropylene film of Example 2 and the polypropylene non-woven fabric are laminated together by ultrasonic lamination technology to form the polypropylene composite film of Example 16, and the ultrasonic frequency is 20KHz. Please refer to the following table 4 for the physical property test of the polypropylene composite film. The thickness of the polypropylene film is 20 μm, and the length and width are each 0.5 meters. The basis weight of the polypropylene non-woven fabric is 18gsm, and the length and width are 0.5 meters each. Ultrasonic bonding is carried out by the ultrasonic bonding machine (model: K-Sonic) of Taiwan Jinghua Ultrasonic Co., Ltd., and the embossing wheel is used to form T-shaped diversion embossing on the upper surface of the upper polypropylene film during bonding , to assist in the diffusion of liquids (such as urine) as they reach the polypropylene composite membrane. For the production method of the polypropylene composite film of Examples 17 to 19, please refer to the above-mentioned Example 16. The difference is that the polypropylene film of Example 6 and the polypropylene non-woven fabric are used for lamination in Examples 17 to 19, and the ultrasonic frequencies are respectively 30, 40 and 50KHz. For the manufacturing method of the polypropylene composite film of Comparative Examples 4 to 5, please refer to the above-mentioned Example 16. The difference is that Comparative Examples 4 to 5 are bonded with the polypropylene film of Example 6 and the polypropylene non-woven fabric, and the ultrasonic frequencies are respectively 10 and 60KHz. Comparative Example 6 A composite non-woven fabric was prepared by using the method described in the patent CN106821605A "waterproof and breathable base film for sanitary products and its preparation method". Composite non-woven fabrics include micro-nano fiber non-woven fabrics and polypropylene non-woven fabrics, which are bonded by hot-melt adhesive, cooled and then combined by cold pressing. Comparative Example 7 is a polyethylene film (PE film), which is obtained by removing the absorber from the commercially available Kao Baby Pants Soft Point Fresh L. Table 4 Polypropylene composite film Gram weight (gsm) Longitudinal tensile strength (Mpa) Transverse tensile strength (Mpa) Longitudinal elongation at break (%) Transverse elongation at break (%) Air permeability (L/m ² /S) Antibacterial power (%) Anti-water pressure (mmH ₂ O) Example 16 (20KHz) 34.5 130 220 165 55 580 0 564 Example 17 (30KHz) 34.5 150 240 190 90 560 85 550 Embodiment 18 (40KHz) 35.0 145 250 195 85 545 91 558 Example 19 (50KHz) 35.4 158 265 192 88 515 84 553 Comparative example 4 (10KHz) 34.2 115 190 135 45 555 89 557 Comparative example 5 (60KHz) 35.1 125 180 145 55 480 88 550 Comparative Example 6 35.4 85 125 90 35 460 0 523 Comparative Example 7 29.5 105 150 60 40 470 0 540

It can be seen from the above Table 4 that when the ultrasonic frequency falls within the range of 20 to 50 KHz, the polypropylene composite film has better longitudinal tensile strength and transverse tensile strength, and also has good air permeability. In contrast to Comparative Example 4 and Comparative Example 5, if the ultrasonic frequency is too low or too high, poor bonding will occur. Compared with Comparative Example 6 and Comparative Example 7, the polypropylene composite films of Examples 16 to 19 of this case have higher longitudinal tensile strength, transverse tensile strength, longitudinal elongation at break and transverse elongation at break, better air permeability rate and anti-water pressure.

Experimental Example 3: Absorption speed test of diapers

The polypropylene composite films of Examples 17 and 18 were used as the bottom film of diapers to test the absorption speed of diapers. Take the Kao baby pants soft and fresh L size, melt the hot melt adhesive of the absorbent body with the hot air of a hair dryer, separate the polyethylene film and the upper layer of the absorbent body, and then place them on the polypropylene composite films of Examples 17 and 18 according to the size of the polyethylene film area Draw the shape of the polyethylene film, cut out a film of the same size with scissors, and then attach the film to the upper absorber with hot air to prepare the diapers of Example A and Example B respectively. The diaper of Comparative Example A is Kao baby pants soft and refreshing (size L).

The diaper absorption rate evaluation method disclosed in this disclosure is tested by using the B-100 diaper absorption rate analyzer in the Formosa Plastics diaper customer service laboratory. The equipment has a flat acrylic plate with dozens of cathode probes. There is an anode probe in the center and it is powered on. Spread the diapers to be tested on the acrylic plate and press 10 kg (the load of L-size baby trousers), inject 70 ml of urine three times (L-size urine Pants evaluation method), when the urine is injected, the computer will start timing, and when the urine is injected, a signal will be generated to stop the timing, and the computer can analyze the urine absorption time. Please refer to Table 5 below for the test results of Examples and Comparative Examples. table 5 Diapers Absorption time T1 (seconds) Absorption time T2 (seconds) Absorption time T3 (seconds) Example A 75 90 125 Example B 80 98 135 Comparative Example A 90 120 150

The bottom films of the diapers of Examples A and B are polypropylene composite films, and the bottom films of the diapers of Comparative Example A are polyethylene films. It can be seen from Table 5 that when the diapers of Example A and Example B absorb urine three times, the required absorption time is shorter than that of the diaper of Comparative Example A, which proves that the polypropylene composite film of the present disclosure has good absorbency , conductivity, can indeed replace polyethylene film as the bottom film of diapers, and has better performance. The T-shaped diversion embossing on the polypropylene composite film can be used to assist the diffusion of urine when it reaches the polypropylene composite film, thereby improving the liquid absorption of the composite film.

In summary, the present disclosure provides a polypropylene composite film and a manufacturing method thereof. Polypropylene composite film includes polypropylene non-woven fabric and polypropylene film, which has excellent air permeability, softness, anti-leakage effect and high strength, so it can be used in sanitary products. The polypropylene film can further include an antibacterial agent. When the polypropylene composite film is used as the bottom film of diapers or diapers, it can prevent bacteria from human excrement from penetrating through the bottom film to cause secondary infection. The surface of the polypropylene composite film can further have diversion embossing to effectively improve the diversion. Polypropylene composite film is conducive to the production of all-polypropylene material diapers or diapers, which is conducive to the recycling of diapers or diapers after subsequent use, and is conducive to circular economy.

Although the disclosure has been described in some detail with reference to certain implementations, other implementations are possible. Therefore, the spirit and scope of the appended claims should not be limited to the description of the embodiments contained herein.

It will be apparent to those skilled in the art that various modifications and changes can be made in the structure of this disclosure without departing from the scope or spirit of the disclosure. In view of the foregoing, it is intended that the present disclosure cover modifications and variations of this disclosure which come within the scope of the appended claims.

none

none

Claims (20)

A polypropylene composite film, comprising: a polypropylene non-woven fabric; and a polypropylene film disposed on the polypropylene non-woven fabric, the polypropylene film and the polypropylene non-woven fabric are bonded to each other by an ultrasonic bonding technique, wherein the An ultrasonic frequency of the ultrasonic bonding technology is about 20KHz to about 50KHz and an upper surface of the polypropylene film has a flow-guiding embossment. The polypropylene composite film as claimed in item 1, wherein an air permeability of the polypropylene composite film is greater than or equal to about 500 L/m ² /S. The polypropylene composite membrane as claimed in claim 1, wherein the polypropylene composite membrane has a net water pressure resistance of greater than or equal to about 550 mmH ₂ O. The polypropylene composite film as described in claim 1 further includes an antibacterial agent in the polypropylene film, the polypropylene film is about 1000 parts by weight, and the antibacterial agent is about 1 to about 100 parts by weight. The polypropylene composite film as described in claim 4, wherein an antibacterial force of the polypropylene composite film is greater than or equal to about 85%. The polypropylene composite film as claimed in item 4, wherein the antibacterial agent comprises quaternary ammonium salt, quaternary ammonium salt polymer, inorganic salt or a combination thereof. The polypropylene composite film as claimed in item 6, wherein the antibacterial agent includes triisodecylmethylammonium chloride, chitin, nano silver, nano zinc or a combination thereof. The polypropylene composite film as claimed in item 1, wherein the shape of the diversion embossment includes T-shape, U-shape, V-shape, I-shape, mesh shape, continuous wave shape or a combination thereof. The polypropylene composite film as claimed in item 1, wherein a longitudinal tensile strength of the polypropylene composite film is greater than or equal to about 130Mpa. The polypropylene composite film as claimed in item 1, wherein a transverse tensile strength of the polypropylene composite film is greater than or equal to about 220Mpa. The polypropylene composite film as claimed in claim 1, wherein the polypropylene composite film has a longitudinal elongation at break greater than or equal to about 165%. The polypropylene composite film as claimed in claim 1, wherein the polypropylene composite film has a transverse elongation at break greater than or equal to about 55%. The polypropylene composite film as claimed in claim 1, wherein a thickness of the polypropylene film is about 10 μm to about 30 μm. A hygienic article, comprising: any of the items 1 to 13 A polypropylene composite film described in one item. The hygienic article as claimed in claim 14, wherein the hygienic article is diapers, diapers, sanitary napkins, panty liners, breast pads or cleaning pads. A method for manufacturing a polypropylene composite film, comprising: melting and plasticizing a polypropylene masterbatch; making the melted and plasticized polypropylene masterbatch into a cast sheet; stretching the cast sheet to form a polypropylene acrylic film; and after the cast sheet is stretched to form the polypropylene film, the polypropylene film is bonded to a polypropylene non-woven fabric by an ultrasonic bonding technique, wherein the ultrasonic bonding technique An ultrasonic frequency is about 20KHz to about 50KHz. The manufacturing method according to claim 16, wherein stretching the cast sheet to form the polypropylene film comprises: longitudinally stretching the cast sheet at a temperature of about 100°C to about 150°C; and The cast sheet is transversely stretched at a temperature of from about 140°C to about 180°C. The manufacturing method according to claim 16, further comprising: after stretching the cast sheet to form the polypropylene film, heat-setting the polypropylene film at a temperature of about 60°C to about 100°C . The manufacturing method according to claim 16, further comprising: mixing the polypropylene masterbatch and an antibacterial agent before melting and plasticizing the polypropylene masterbatch. The manufacturing method as claimed in claim 16, further comprising: forming a diversion embossment on an upper surface of the polypropylene film.