Water-based hot melt adhesive and water-based hot melt adhesive coating non-woven fabric thereof

Abstract

The invention relates to a water-based hot melt adhesive and a water-based hot melt adhesive coating non-woven fabric thereof. Specifically, the invention provides a water-based hot melt adhesive for a medical packaging material, and the water-based hot melt adhesive comprises the following components in parts by weight: 20-60 parts of hydrophilic modified water-based polyolefin resin; 1 to 30 parts by weight of an aqueous ionic polymer; 10 parts by weight to 30 parts by weight of powder wax; and 10 to 30 parts by weight of a powder tackifier. A coating formed by the water-based hot melt adhesive on a medical packaging base material can have good air permeability and weather resistance, and the medical packaging base material with the water-based hot melt adhesive can have good sealing strength, peelability and good reliability after being sealed with a flexible sheet or a blister at the periphery.

Description

Technical Field

[0001] The present invention relates to a water-based hot melt adhesive, which can be used for a hot melt adhesive coating of medical product packaging to be suitable for heat sealing and achieve good sealing strength and weather resistance without affecting the air permeability and peelability required for medical product packaging. Background Art

[0002] The main purpose of medical supply packaging is to provide a sterile environment for medical supplies during transportation or before use after they are manufactured, so that the medical devices remain sterile before use. Medical supplies are generally sterilized after packaging. The sterilization process can usually be divided into steam sterilization (SteamSterilization), EO sterilization (Ethylene Oxide Sterilization) and radiation sterilization (RadiationSterilization). In response to different sterilization methods, the medical packaging materials used are also different. For example, for packaging materials used for EO sterilization and steam sterilization, the materials need to have excellent gas permeability to ensure that water vapor or EO gas can effectively pass through the packaging bag during the sterilization process and sterilize the internal medical devices. In the prior art, the most widely used materials that have both good microbial barrier effects and air permeability can be medical paper or a polyethylene film with pores made by melt-blowing, such as DuPont Tyvek ® .

[0003] This type of medical packaging material is usually packaged using heat sealing, where a breathable material such as medical paper or a porous polyethylene film is heat-sealed on all four sides with another plastic flexible sheet or a blister. In addition to good air permeability, this medical packaging material must also have good heat sealing strength and peelability. Insufficient heat sealing strength will result in poor sealing of the medical packaging, which may cause bag breakage due to high gas pressure during sterilization, while excessive heat sealing strength will make it difficult for users to tear open the package or cause dust to stick to the medical supplies due to pulling the fibers when tearing.

[0004] The heat-sealing adhesive used in medical breathable materials mostly adopts hot melt adhesive for sealing. The traditional hot melt adhesive formula is to melt and mix the components such as thermoplastic resin, tackifier, wax, filler, plasticizer, antioxidant and auxiliary agent, and then shape them into the granular, strip, sheet and film forms to be used, and then use hot pressing or hot melting treatment for processing and use, and the process is relatively complicated. For example, CN108587521A discloses a water-based coating heat-sealing adhesive for medical dialysis paper, which stirs and emulsifies thermoplastic resin, resin tackifier, wax, emulsifier and auxiliary agent at a high temperature of 120°C to form a hot melt adhesive coating liquid, and applies it on medical paper or non-woven fabric to form a heat-sealing layer. This sealing layer provides high adhesion, but if the adhesion is too large, it is easy to cause damage when the medical packaging is torn, which may cause the medical supplies packaging material to fall and pollute the medical materials. In the medical blister box heat-sealing material disclosed in CN110591602A, by coating the surface glue and the base glue of different components, the bonding force between the surface glue and the base glue is lower than that between the surface glue and the packaging material, so as to maintain the bonding force between the medical supplies packaging material and the blister box but not easy to tear the medical supplies packaging material. However, this requires the coating of two layers of glue, which will increase the inconvenience of production. In addition, CN108441149A discloses a two-stage manufacturing method for preparing a hot melt adhesive coating for use in the heat-sealing layer of medical packaging materials. The manufacturing method melts and mixes a thermoplastic resin, a resin tackifier and a wax at a high temperature above 160°C to form a hot melt adhesive powder, and then emulsifies and disperses the powder in a polyacrylic acid emulsion with an emulsifier to form a coating. This two-stage manufacturing method increases the complexity of production.

[0005] In addition, since medical devices generally have a shelf life of more than five years, the hot melt adhesive used in medical packaging materials may have its heat-sealing properties excessively increased or decreased due to the ambient temperature during storage or transportation, causing the package to be difficult to tear off, or causing dust to stick to the medical supplies due to pulling the fibers when tearing, or causing bag breakage due to poor sealing.

[0006] The present invention provides a water-based hot melt adhesive that can be used for medical packaging materials. The hot melt adhesive coating formed on the medical packaging material substrate can provide good air permeability and weather resistance. The medical packaging material substrate with the hot melt adhesive coating can still have reliable sealing strength and peelability after being sealed with a flexible sheet or a blister shell at the periphery and undergoing reliability testing. Summary of the invention

[0007] The present invention provides a water-based hot melt adhesive for medical packaging materials, which can form a coating on an olefin-based spunbond non-woven fabric for medical use, so that the non-woven fabric still has good air permeability after being sealed with a flexible sheet or a blister container at the periphery, so as to facilitate steam sterilization and EO gas sterilization processes and maintain sealing stability. The water-based hot melt adhesive of the present invention can eliminate the mixing step required for traditional hot melt adhesives, and can achieve the sealing strength and specific air permeability required for medical packaging materials after application. In addition, after the reliability test, the sealing strength of the medical packaging material made with the water-based hot melt adhesive of the present invention will not be excessively increased or decreased, so it can still have reliable sealing strength and peelability. When peeling the heat-sealed seal, the water-based hot melt adhesive coating can be stably disconnected, so the pollution problem caused by the shedding of fibers of the non-woven fabric substrate can be reduced.

[0008] The water-based hot melt adhesive disclosed in the present invention may include 20 to 60 parts by weight of a hydrophilically modified water-based polyolefin resin; 1 to 30 parts by weight of a water-based ion polymer; 10 to 30 parts by weight of a powder wax; and 10 to 30 parts by weight of a powder tackifier.

[0009] In one embodiment of the present invention, the total amount of powder of the water-based hot melt adhesive accounts for 30 wt % to 55 wt % of the total weight of the water-based hot melt adhesive.

[0010] In a preferred embodiment of the present invention, the water-based hot melt adhesive may preferably include 24 to 58 parts by weight of a hydrophilically modified water-based polyolefin resin; 2 to 28 parts by weight of an aqueous ion polymer; 15 to 27 parts by weight of a powder wax; and 15 to 27 parts by weight of a powder thickener; wherein the total amount of powder in the water-based hot melt adhesive accounts for 32wt% to 52wt% of the total weight of the water-based hot melt adhesive.

[0011] In one embodiment of the present invention, the particle size (D50) of the powdered wax may be between 3 μm and 20 μm, and preferably between 3 μm and 15 μm.

[0012] In one embodiment of the present invention, the particle size (D50) of the powdered viscosity enhancer may be between 3 μm and 35 μm, and preferably between 5 μm and 30 μm.

[0013] In one embodiment of the present invention, the weight ratio of the powder wax to the powder tackifier is between 0.6:1 and 3:1.

[0014] In one embodiment of the present invention, the glass transition temperature (Tg) of the hydrophilically modified water-based polyolefin resin is less than 0°C and the melting point is higher than 90°C, the glass transition temperature (Tg) of the water-based ionomer is less than 0°C and the melting point is higher than 80°C, the glass transition temperature (Tg) of the powder wax is less than 0°C and the melting point is between 70°C and 180°C, and the glass transition temperature (Tg) of the powder tackifier is greater than 0°C and the melting point is between 90°C and 160°C.

[0015] In one embodiment of the present invention, the glass transition temperature (Tg) of the water-based hot melt adhesive is between -120°C and -50°C.

[0016] In one embodiment of the present invention, the hydrophilically modified waterborne polyolefin resin may be, for example, a waterborne polyethylene resin, a waterborne polypropylene resin, a waterborne polybutylene resin, a waterborne oxidized polyethylene resin or a combination thereof.

[0017] In one embodiment of the present invention, the aqueous ionomer may be, for example, polyethylene ionomer, polypropylene ionomer, polyurethane ionomer, polystyrene butadiene ionomer or a combination thereof.

[0018] In one embodiment of the present invention, the powder wax may be, for example, Fischer-Tropsch synthesis powder wax, polypropylene powder wax, polyethylene powder wax, oxidized polyethylene powder wax, microcrystalline wax or a combination thereof.

[0019] In one embodiment of the present invention, the powdered tackifier may be, for example, C5 petroleum resin powder, C9 petroleum resin powder, C5 / C9 copolymerized petroleum resin powder or a combination thereof.

[0020] In another embodiment of the present invention, the water-based hot melt adhesive may further include water-based paraffin.

[0021] In another embodiment of the present invention, the water-based hot melt adhesive may include 1 to 10 parts by weight of water-based paraffin.

[0022] The present invention further proposes a water-based hot melt adhesive coated non-woven fabric, which comprises an olefin-based spunbond non-woven fabric substrate and a water-based hot melt adhesive coating formed on at least one surface of the olefin-based spunbond non-woven fabric substrate, wherein the water-based hot melt adhesive configured to form the water-based hot melt adhesive coating comprises: 20 to 60 parts by weight of a hydrophilically modified water-based polyolefin resin; 1 to 30 parts by weight of a water-based ion polymer; 10 to 30 parts by weight of a powder wax; and 10 to 30 parts by weight of a powder thickener.

[0023] The air permeability of the aforementioned water-based hot melt adhesive coated non-woven fabric can be less than 170 seconds and the sealing strength can be greater than 265g / 15mm.

[0024] The coating amount of the water-based hot melt adhesive of the water-based hot melt adhesive coated non-woven fabric on the olefin-based spunbond non-woven fabric substrate can be between 10 g / m 2 Up to 20g / m 2 between.

[0025] The above invention content is intended to provide a simplified summary of the present disclosure so that readers can have a basic understanding of the present disclosure. This invention content is not a complete overview of the present disclosure, and its intention is not to point out the important / key elements of the embodiments of the present invention or to define the scope of the present invention. After referring to the following embodiments, those with ordinary knowledge in the technical field to which the present invention belongs can easily understand the basic spirit of the present invention and the technical means and embodiments adopted by the present invention. DETAILED DESCRIPTION

[0026] In order to make the description of the disclosure of the present invention more detailed and complete, the following provides an illustrative description of the implementation methods and specific examples of the present invention; however, this is not the only form of implementing or applying the specific examples of the present invention. The various embodiments disclosed below can be combined or replaced with each other under beneficial circumstances, and other embodiments can be added to one embodiment without further recording or explanation.

[0027] The advantages, features and technical methods achieved by the present invention will be described in more detail with reference to exemplary embodiments so as to be more easily understood, and the present invention may be implemented in different forms, so it should not be understood as being limited to the embodiments described herein. On the contrary, for those skilled in the art, the provided embodiments will make the present disclosure more thorough and comprehensive and fully convey the scope of the present invention, and the present invention will only be defined by the appended claims.

[0028] Unless otherwise defined, all terms (including technical and scientific terms) and proper nouns used in the following text have substantially the same meaning as generally understood by technicians in the field to which the present invention belongs. For example, those terms defined in commonly used dictionaries should be understood to have meanings consistent with the content of the relevant field, and will not be understood in an overly idealized or overly formal sense unless clearly defined in the following text.

[0029] The present invention provides an aqueous hot melt adhesive for medical packaging materials, which comprises 20 to 60 parts by weight of a hydrophilically modified aqueous polyolefin resin; 1 to 30 parts by weight of an aqueous ion polymer; 10 to 30 parts by weight of a powder wax; and 10 to 30 parts by weight of a powder tackifier.

[0030] The water-based hot melt adhesive of the present invention can be coated on the surface of the olefin-based spunbond nonwoven fabric as the substrate of the medical packaging material after adding water as a solvent, and a water-based hot melt adhesive coated nonwoven fabric can be prepared after heating to remove the solvent. The water-based hot melt adhesive coated nonwoven fabric can provide good air permeability, so that the water-based hot melt adhesive coated nonwoven fabric and the flexible sheet or blister container can be heat-sealed at the periphery and then steam sterilized or EO gas sterilized. Furthermore, the water-based hot melt adhesive of the present invention can provide good thermal adhesion, peelability and weather resistance. The medical packaging material prepared by the water-based hot melt adhesive can still have the required heat sealing strength after reliability testing, and when the packaging material is torn, the packaging material will be stably disconnected by the water-based hot melt adhesive layer to reduce the pollution caused by the shedding of the substrate fiber.

[0031] The water-based hot melt adhesive of the present invention contains a water-based polyolefin resin and a water-based ionomer that have been hydrophilically modified. Since the water-based hot melt adhesive contains polar functional groups, the intermolecular forces thereof can be enhanced, thereby stabilizing the structure of the heat-sealed portion. Therefore, the hot melt adhesive can have good weather resistance.

[0032] The water-based hot melt adhesive of the present invention is prepared by adding water-based ion polymer, powder wax, powder thickener and water as a solvent to the water-based polyolefin resin modified by hydrophilicity, and then fully mixing and dispersing to form a coating liquid for subsequent coating process. After coating, the solvent is evaporated by heating to obtain the water-based hot melt adhesive of the present invention. The water-based hot melt adhesive of the present invention can be directly heat-sealed at 90°C to 150°C, eliminating the mixing step required by traditional hot melt adhesives, and can achieve the required adhesion and specific breathability of hot melt adhesives after application, and has good weather resistance.

[0033] In a preferred embodiment of the present invention, the aqueous hot melt adhesive preferably comprises 24 to 58 parts by weight of a hydrophilically modified aqueous polyolefin resin, 2 to 28 parts by weight of an aqueous ion polymer, 15 to 27 parts by weight of a powder wax, and 15 to 27 parts by weight of a powder thickener. If the amount of the aqueous ion polymer used is too small, the weather resistance of the prepared medical packaging material will be affected. If the amount of the aqueous ion polymer used is too large, the air permeability of the medical packaging material will be insufficient.

[0034] In one embodiment of the present invention, the total weight of the powder of the water-based hot melt adhesive, that is, the total weight of the powder wax and the powder tackifier, accounts for 30wt% to 55wt% of the total weight of the water-based hot melt adhesive, and preferably accounts for 32% to 52% of the total weight of the water-based hot melt adhesive. If the total amount of the powder is too little, the coating will have insufficient air permeability, and if the total amount of the powder is too much, the sealing strength will be too low.

[0035] The water-based hot melt adhesive of the present invention uses a hydrophilically modified water-based polyolefin resin as a hot melt adhesive matrix. The formed water-based hot melt adhesive coating has high adhesion to the olefin-based spunbonded non-woven fabric substrate when coated on the substrate. Moreover, since the polyolefin resin is a low-polarity material, when the formed water-based hot melt adhesive coated non-woven fabric is heat-sealed with a flexible packaging material such as a polyethylene substrate or a polypropylene substrate, the surface polarity difference between the two is low. Therefore, the adhesion strength at the bonding interface is high, the heat sealing stability can be maintained, and the fiber shedding when the non-woven fabric substrate is torn off can be reduced.

[0036] The hydrophilically modified aqueous polyolefin resin may be, for example, a polyolefin modified with an unsaturated carboxylic acid or its anhydride, or a polyolefin resin to which a surfactant is added. The hydrophilically modified aqueous polyolefin resin used in the aqueous hot melt adhesive of the present invention may have a glass transition temperature (glass transition temperature, Tg) less than 0°C and a melting point higher than 90°C. Preferably, the glass transition temperature (Tg) may be less than -100°C and the melting point may be higher than 120°C. The hydrophilically modified aqueous polyolefin resin used in the present invention may be, for example, an aqueous polyethylene resin, an aqueous polypropylene resin, an aqueous polybutylene resin or an aqueous oxidized polyethylene resin, but is not limited thereto. One or more hydrophilically modified aqueous polyolefin resins may be used as the hot melt adhesive matrix in the aqueous hot melt adhesive.

[0037] The hydrophilically modified water-based polyolefin resin suitable for the water-based hot melt adhesive of the present invention can be a commercially available product, such as ALTRIX WPE-09838 purchased from Kolon Chemical; SB-1030N from Unitika arrowbase of Japan; HME-118-B from MICA of the United States, etc., but not limited thereto.

[0038] The water-based hot melt adhesive of the present invention improves the weather resistance of the hot melt adhesive by adding a water-based ionomer. An ionomer refers to a polymer with a copolymer of ethylene and (meth) acrylic acid as the main chain, on which metal ions are introduced to cross-link molecules by ionic bonds. The glass transition temperature (Tg) of the water-based ionomer used in the water-based hot melt adhesive of the present invention may be less than 0°C and the melting point may be higher than 80°C. Preferably, the glass transition temperature (Tg) may be less than -100°C and the melting point may be higher than 85°C. The water-based ionomer used in the present invention may be, for example, a polyethylene ionomer, a polypropylene ionomer, a polyurethane ionomer or a polystyrene butadiene ionomer, but is not limited thereto. One or more water-based ionomers may be used in the water-based hot melt adhesive.

[0039] The aqueous ionic polymer suitable for the aqueous hot melt adhesive of the present invention can be a commercially available product, such as CHEMIPEARL purchased from Mitsui Chemicals of Japan. TM S300, S500; DuPont Surlyn® Thermoplastic ionomer resin, but not limited thereto.

[0040] The powder wax of the water-based hot melt adhesive of the present invention is used to reduce the melt viscosity and surface viscosity of the water-based hot melt adhesive and adjust the fluidity and wettability of the hot melt adhesive, but will not significantly reduce the adhesive properties of the water-based hot melt adhesive. Furthermore, in order to help the coating formed by the water-based hot melt adhesive of the present invention on the olefin-based spunbond non-woven fabric substrate have good air permeability, the particle size (D50) of the powder wax can be between 3 microns (μm) and 20 microns (μm), and preferably between 3 microns (μm) and 15 microns (μm).

[0041] The glass transition temperature (Tg) of the powder wax suitable for the water-based hot melt adhesive of the present invention may be less than 0°C, and the melting point may be between 70°C and 180°C. The powder wax used in the present invention may be, for example, commercially available Fischer-Tropsch synthetic powder wax, polypropylene powder wax, polyethylene powder wax, oxidized polyethylene powder wax, microcrystalline wax or a combination thereof, but is not limited thereto. Applicable Fischer-Tropsch synthetic powder wax may be, for example, Sasolwax Spray 30-G, Spray 30G-M, Spray 30G-EF, Spray 105, Spray 105-G, Spray 105G-EF, Sasolwax Aqua 30-G, Aqua 30G-EF, etc. obtained from Sasol ChemicalsPacific Ltd. of South Africa. Applicable polypropylene powder wax may be, for example, CERAFLOUR ® 913.CERAFLOUR ® 914. CERETAN from Münzing Chemie, Germany ® MP2120, etc.; Suitable polyethylene powder waxes may be, for example, CERAFLOUR ® 925、CERAFLOUR ® 929N, CERETAN from Münzing Chemie, Germany ® MO4715, etc., but not limited thereto.

[0042] In one embodiment of the present invention, the tackifier can reduce the melt viscosity of the water-based hot melt adhesive, improve the wettability and initial adhesion of the adherend, and adjust the heat resistance temperature of the hot melt adhesive. The powder tackifier is used in the water-based hot melt adhesive of the present invention to achieve a high total amount of powder, so that when the water-based hot melt adhesive is coated on the olefin-based spunbond non-woven fabric as the substrate of the medical packaging material, the coating can maintain appropriate gaps while still providing the expected sealing strength and overall adhesion to the non-woven fabric substrate.

[0043] In order to make the coating formed by the water-based hot melt adhesive of the present invention on the olefin-based spunbonded non-woven fabric substrate have good air permeability and sealing strength, the particle size (D50) of the powder thickener used in the water-based hot melt adhesive of the present invention is similar to the particle size (D50) of the powder wax, which can be between 3 microns (μm) and 35 microns (μm), preferably between 5 microns (μm) and 30 microns (μm). The glass transition temperature (Tg) of the powder thickener is greater than 0°C and the melting point is between 90°C and 160°C. In the water-based hot melt adhesive of the present invention, the amount of the powder thickener can be adjusted according to the amount of the powder wax, so that the total amount of powder in the water-based hot melt adhesive, that is, the total amount of the powder thickener and the powder wax, is between 30wt% and 55wt% of the water-based hot melt adhesive, and preferably between 32wt% and 52wt%. The weight ratio of the powder wax to the powder thickener can be between 0.6:1 and 3:1. If the amount of powder wax used is too little, the uniform fracture characteristics of the adhesive layer cannot be achieved. If the amount of powder wax used is too much, the sealing strength will be insufficient.

[0044] The powder thickener suitable for the water-based hot melt adhesive of the present invention can be a petroleum resin powder with a softening point higher than 90°C, such as C5 petroleum resin powder, C9 petroleum resin powder, C5 / C9 copolymerized petroleum resin powder or a combination thereof. The powder thickener can be a commercial product, such as Wingtack provided by Cray Valley Company in the United States. ® 95. Wingtack ® 98. Wingtack ® STS, Wingtack ® Extra, Cleartack ® W-90、Cleartack ® W-110、Cleartack ® W-120、Cleartack ® W-140, Regalite provided by Synthomer, UK TM R1090, Regalite TM R1125, YL-90, YL-120H provided by Yuan Liang Industrial Co., Ltd., but not limited to these.

[0045] In another embodiment of the water-based hot melt adhesive of the present invention, the water-based hot melt adhesive may further include water-based paraffin wax to help improve the air permeability of the water-based hot melt adhesive coating, but if the water-based hot melt adhesive contains an excessive amount of water-based paraffin wax, it may cause insufficient heat sealing strength. In another embodiment of the present invention, the water-based hot melt adhesive may selectively further include 1 to 10 parts by weight of water-based paraffin wax. The water-based paraffin wax suitable for the water-based hot melt adhesive of the present invention may be a paraffin wax emulsion with a solid content of between 40% and 60% and a melting point of not more than 70°C, such as the commercially available AQUACER 494 or AQUACER 497 of BYK Chemical (BYK) of Germany.

[0046] The water-based hot melt adhesive disclosed in the present invention may further include other additives, such as wetting dispersants, defoamers, thickeners, etc., which are beneficial to the coating processability of the water-based hot melt adhesive; antioxidants, UV stabilizers, antibacterial agents, antistatic agents, etc., which are added to increase the functionality of the water-based hot melt adhesive. The types and amounts of these additives can be selected by those skilled in the art according to actual needs.

[0047] The present invention further provides a water-based hot melt adhesive coated nonwoven fabric, which comprises an olefin-based spunbond nonwoven fabric substrate and a hot melt adhesive coating formed by the water-based hot melt adhesive on at least one surface of the substrate. The water-based hot melt adhesive coated nonwoven fabric can have an air permeability of less than 170 seconds (TAPPI (Technical Association of the Pulp and Paperindustry) T-460) and a sealing strength greater than 265g / 15mm (ASTM (American Society for Testingand Materials) F-88).

[0048] The "seal strength" referred to herein refers to the tensile force required to separate two sealed flexible sheets, which is measured in a "T-separation" test at a tensile speed of 200 mm / min according to ASTM F88.

[0049] The "air permeability" mentioned herein refers to the air resistance of gas passing through a breathable sheet, which is measured according to TAPPI T-460 standard as the air resistance of 100 cc of gas passing through a circular area of ​​about 1 square inch at a pressure difference of 1.22 kPa.

[0050] The olefin spunbond nonwoven fabric suitable for the water-based hot melt adhesive coated nonwoven fabric of the present invention can be selected and used in medical packaging. The density is between 40g / m 2 Up to 80g / m 2 DuPont Tyvek ® , such as Tyvek ® 1073B, Tyvek ® 1059B, Tyvek® 2FS, etc., but not limited to.

[0051] The water-based hot melt adhesive coated non-woven fabric of the present invention can be evenly coated on the olefin-based spunbond non-woven fabric substrate or locally coated in a specific area, and the coating amount is between 10 g / m 2 Up to 20g / m 2 , preferably between 12g / m 2 Up to 19.5g / m 2 .

[0052] The packaging substrate suitable for sealing with the water-based hot melt adhesive coated non-woven fabric of the present invention can be, for example, polyethylene terephthalate (PET), polyvinyl chloride (PVC), polystyrene (PS), polypropylene (PP), polyethylene (PE), polycarbonate (PC) or polyamide (Nylon) flexible sheet or its blister shell, but is not limited thereto.

[0053] The water-based hot melt adhesive coated nonwoven fabric of the present invention can be thermally bonded to another packaging substrate, such as the aforementioned flexible sheet or blister, at a temperature of 90°C to 150°C, and the sealing strength after bonding is greater than 265g / 15mm, preferably greater than 270g / 15mm.

[0054] The preparation method of the water-based hot melt adhesive coated non-woven fabric disclosed in the present invention includes adding water-based ion polymer, powder wax, powder thickener and water as a solvent to a hydrophilically modified water-based polyolefin resin, fully stirring and dispersing, and forming a water-based hot melt adhesive emulsion. The prepared water-based hot melt adhesive emulsion can be coated on an olefin-based spunbond non-woven fabric substrate, and dried at a temperature of 60°C to 100°C to remove the solvent to form a water-based hot melt adhesive coated non-woven fabric. The coating method of the water-based hot melt adhesive can adopt, for example, roller coating, blade coating, roller coating, spin coating, spray coating, slit coating, air knife coating and other coating methods commonly used in this technical field, but not limited thereto.

[0055] The water-based hot melt adhesive coated non-woven fabric of the present invention has good air permeability after being heat-sealed with a flexible sheet or a blister at the periphery, so as to facilitate steam sterilization or EO gas sterilization process, and has good weather resistance. After undergoing reliability testing, it can still provide reliable sealing strength and peelability, so that when the heat-sealed seal is peeled off, the water-based hot melt adhesive coating can be stably disconnected, thereby reducing the problem of non-woven fabric fiber shedding causing medical device contamination.

[0056] The following examples are used to further illustrate the present invention, but the contents of the present invention are not limited thereto.

[0057] Example

[0058] The materials used in the embodiments of the present invention are as follows:

[0059] WPE-09838: polyethylene latex, melting point of 145°C, glass transition temperature (Tg) of -120°C, solid content of 25%, solvent of water, purchased from Gonglong Chemical Co., Ltd.

[0060] DL 326PA: styrene-butadiene rubber latex, melting point of 230.9°C, glass transition temperature (Tg) of -42.1°C, solid content of 50%, solvent of water, purchased from Trinseo, USA.

[0061] VINNAPAS ® EAF-68: ethylene-vinyl acetate-acrylic acid copolymer latex, melting point of 240°C, glass transition temperature (Tg) of -35°C, solid content of 59.5%, solvent of water, purchased from Wacker Chemie AG, Germany.

[0062] Michem ® Prime 4983-40R: ethylene acrylic acid copolymer latex, melting point of 140°C, glass transition temperature (Tg) of 6.2°C, solid content of 40%, solvent is water, purchased from Michelman Company, USA.

[0063] CHEMIPEARL™ S300: Polyethylene ionomer resin emulsion, melting point 96°C, glass transition temperature (Tg) -120°C, solid content 35%, solvent water, purchased from Mitsui Chemicals, Inc. of Japan.

[0064] CHEMIPEARL™ S500: Polyethylene ionomer resin emulsion, melting point 89°C, glass transition temperature (Tg) -120°C, solid content 42%, solvent is water, purchased from Mitsui Chemicals, Inc. of Japan.

[0065] Aquacer 497: paraffin emulsion with a solid content of 50%, solvent is water, purchased from BYK, Germany.

[0066] Sasolwax Spray 30G-M: Fischer-Tropsch synthetic powder wax, with a melting point of 96 to 100° C., a glass transition temperature (Tg) of about −120° C., and an average particle size of 9 to 11 μm, purchased from Sasol Limited of South Africa.

[0067] Cleartack ®W-140: C9 petroleum resin powder, softening point of 140°C, glass transition temperature (Tg) of 90°C, number average molecular weight (Mn) of 1200 g / mol, where the number average molecular weight (Mn) is the total molecular mass (g) / total molar number (mol), average particle size of 5 to 10 μm, purchased from Cray Valley Chemical Co., Ltd., USA.

[0068] BYK-3450: polyether-modified siloxane wetting and dispersing agent, purchased from BYK, Germany.

[0069] Rheovis ® AS-1125: acrylic thickener, purchased from Cognis GmbH, Germany.

[0070] BYK-025: polysiloxane defoamer, solid content of 18.5%, solvent is dipropylene glycol monomethyl ether, purchased from BYK, Germany.

[0071] Tyvek ® 2FS: high-density polyethylene spunbond nonwoven fabric substrate, purchased from DuPont, USA.

[0072] Example 1

[0073] 29.84 parts by weight of polyethylene latex (WPE-09838), 17.5 parts by weight of polyethylene ionomer latex (S500), 7.49 parts by weight of Fischer-Tropsch synthetic powder wax (Sasolwax Spray 30G-M), 7.49 parts by weight of C9 petroleum resin powder (Cleartack ® W-140), 0.12 parts by weight of a dispersant (BYK-3450), 2.86 parts by weight of a thickener (AS-1125), 0.08 parts by weight of a defoamer (BYK-025) and 87.8 parts by weight of deionized water were mixed and stirred for 1 hour to uniformly disperse them to form an aqueous hot melt adhesive solution.

[0074] The aqueous hot melt adhesive solution was coated on a high-density polyethylene spunbond nonwoven fabric substrate (Tyvek ® 2FS), and dried at 80° C. for 2 minutes to form an aqueous hot melt adhesive coating on the high-density polyethylene spunbond non-woven fabric substrate to prepare an aqueous hot melt adhesive coated non-woven fabric.

[0075] The obtained water-based hot melt adhesive coated nonwoven fabric was subjected to air permeability test, peeling test, heat sealing strength test and reliability test according to the method described below. The test results are shown in Table 1 below.

[0076] Example 2

[0077] 29.84 parts by weight of polyethylene latex (WPE-09838), 1.6 parts by weight of polyethylene ionomer latex (S500), 2.57 parts by weight of Fischer-Tropsch synthetic powder wax (Sasolwax Spray 30G-M), 2.57 parts by weight of C9 petroleum resin powder (Cleartack ® W-140), 0.12 parts by weight of a dispersant (BYK-3450), 2.86 parts by weight of a thickener (AS-1125), 0.08 parts by weight of a defoamer (BYK-025) and 87.8 parts by weight of deionized water were mixed and stirred for 1 hour to uniformly disperse them to form an aqueous hot melt adhesive solution.

[0078] The aqueous hot melt adhesive solution was coated on a high-density polyethylene spunbond nonwoven fabric substrate (Tyvek ® 2FS), and dried at 80° C. for 2 minutes to form an aqueous hot melt adhesive coating on the high-density polyethylene spunbond non-woven fabric substrate to prepare an aqueous hot melt adhesive coated non-woven fabric.

[0079] The obtained water-based hot melt adhesive coated nonwoven fabric was subjected to air permeability test, peeling test, heat sealing strength test and reliability test according to the method described below. The test results are shown in Table 1 below.

[0080] Example 3

[0081] 29.84 parts by weight of polyethylene latex (WPE-09838), 3.9 parts by weight of polyethylene ionomer latex (S300), 2.24 parts by weight of Fischer-Tropsch synthetic powder wax (Sasolwax Spray 30G-M), 2.24 parts by weight of C9 petroleum resin powder (Cleartack ® W-140), 0.12 parts by weight of a dispersant (BYK-3450), 2.86 parts by weight of a thickener (AS-1125), 0.08 parts by weight of a defoamer (BYK-025) and 87.8 parts by weight of deionized water were mixed and stirred for 1 hour to uniformly disperse them to form an aqueous hot melt adhesive solution.

[0082] The aqueous hot melt adhesive solution was coated on a high-density polyethylene spunbond nonwoven fabric substrate (Tyvek ® 2FS), and dried at 80° C. for 2 minutes to form an aqueous hot melt adhesive coating on the high-density polyethylene spunbond non-woven fabric substrate to prepare an aqueous hot melt adhesive coated non-woven fabric.

[0083] The obtained water-based hot melt adhesive coated nonwoven fabric was subjected to air permeability test, peeling test, heat sealing strength test and reliability test according to the method described below. The test results are shown in Table 1 below.

[0084] Example 4

[0085] 29.84 parts by weight of polyethylene latex (WPE-09838), 1.8 parts by weight of polyethylene ionomer latex (S500), 3.1 parts by weight of Fischer-Tropsch synthetic powder wax (Sasolwax Spray 30G-M), 3.1 parts by weight of C9 petroleum resin powder (Cleartack ® W-140), 0.12 parts by weight of a dispersant (BYK-3450), 2.86 parts by weight of a thickener (AS-1125), 0.08 parts by weight of a defoamer (BYK-025) and 87.8 parts by weight of deionized water were mixed and stirred for 1 hour to uniformly disperse them to form an aqueous hot melt adhesive solution.

[0086] The aqueous hot melt adhesive solution was coated on a high-density polyethylene spunbond nonwoven fabric substrate (Tyvek ® 2FS), and dried at 80° C. for 2 minutes to form an aqueous hot melt adhesive coating on the high-density polyethylene spunbond non-woven fabric substrate to prepare an aqueous hot melt adhesive coated non-woven fabric.

[0087] The obtained water-based hot melt adhesive coated nonwoven fabric was subjected to air permeability test, peeling test, heat sealing strength test and reliability test according to the method described below. The test results are shown in Table 1 below.

[0088] Example 5

[0089] 29.84 parts by weight of polyethylene latex (WPE-09838), 14.8 parts by weight of polyethylene ionomer latex (S500), 5.13 parts by weight of Fischer-Tropsch synthetic powder wax (Sasolwax Spray 30G-M), 5.13 parts by weight of C9 petroleum resin powder (Cleartack ® W-140), 0.12 parts by weight of a dispersant (BYK-3450), 2.86 parts by weight of a thickener (AS-1125), 0.08 parts by weight of a defoamer (BYK-025) and 87.8 parts by weight of deionized water were mixed and stirred for 1 hour to uniformly disperse them to form an aqueous hot melt adhesive solution.

[0090] The aqueous hot melt adhesive solution was coated on a high-density polyethylene spunbond nonwoven fabric substrate (Tyvek ® 2FS), and dried at 80° C. for 2 minutes to form an aqueous hot melt adhesive coating on the high-density polyethylene spunbond non-woven fabric substrate to prepare an aqueous hot melt adhesive coated non-woven fabric.

[0091] The obtained water-based hot melt adhesive coated nonwoven fabric was subjected to air permeability test, peeling test, heat sealing strength test and reliability test according to the method described below. The test results are shown in Table 1 below.

[0092] Example 6

[0093] 29.84 parts by weight of polyethylene latex (WPE-09838), 8.0 parts by weight of polyethylene ionomer latex (S300), 3.94 parts by weight of Fischer-Tropsch synthetic powder wax (Sasolwax Spray 30G-M), 3.94 parts by weight of C9 petroleum resin powder (Cleartack ® W-140), 0.12 parts by weight of a dispersant (BYK-3450), 2.86 parts by weight of a thickener (AS-1125), 0.08 parts by weight of a defoamer (BYK-025) and 87.8 parts by weight of deionized water were mixed and stirred for 1 hour to uniformly disperse them to form an aqueous hot melt adhesive solution.

[0094] The aqueous hot melt adhesive solution was coated on a high-density polyethylene spunbond nonwoven fabric substrate (Tyvek ® 2FS), and dried at 80° C. for 2 minutes to form an aqueous hot melt adhesive coating on the high-density polyethylene spunbond non-woven fabric substrate to prepare an aqueous hot melt adhesive coated non-woven fabric.

[0095] The obtained water-based hot melt adhesive coated nonwoven fabric was subjected to air permeability test, peeling test, heat sealing strength test and reliability test according to the method described below. The test results are shown in Table 1 below.

[0096] Example 7

[0097] 44.6 parts by weight of polyethylene latex (WPE-09838), 1.5 parts by weight of polyethylene ionomer latex (S500), 3.2 parts by weight of paraffin wax (CER-497), 3.76 parts by weight of Fischer-Tropsch synthetic powder wax (Sasolwax Spray30G-M), 3.76 parts by weight of C9 petroleum resin powder (Cleartack ® W-140), 0.12 parts by weight of a dispersant (BYK-3450), 2.86 parts by weight of a thickener (AS-1125), 0.08 parts by weight of a defoamer (BYK-025) and 87.8 parts by weight of deionized water were mixed and stirred for 1 hour to uniformly disperse them to form an aqueous hot melt adhesive solution.

[0098] The aqueous hot melt adhesive solution was coated on a high-density polyethylene spunbond nonwoven fabric substrate (Tyvek ® 2FS), and dried at 80° C. for 2 minutes to form an aqueous hot melt adhesive coating on the high-density polyethylene spunbond non-woven fabric substrate to prepare an aqueous hot melt adhesive coated non-woven fabric.

[0099] The obtained water-based hot melt adhesive coated nonwoven fabric was subjected to air permeability test, peeling test, heat sealing strength test and reliability test according to the method described below. The test results are shown in Table 1 below.

[0100] Example 8

[0101] 29.76 parts by weight of polyethylene latex (WPE-09838), 1.11 parts by weight of polyethylene ionomer latex (S500), 0.62 parts by weight of paraffin wax (CER-497), 3.25 parts by weight of Fischer-Tropsch synthetic powder wax (Sasolwax Spray30G-M), 3.25 parts by weight of C9 petroleum resin powder (Cleartack ® W-140), 0.05 parts by weight of a dispersant (BYK-3450), 1.56 parts by weight of a thickener (AS-1125), 0.03 parts by weight of a defoamer (BYK-025) and 35 parts by weight of deionized water were mixed and stirred for 1 hour to uniformly disperse them to form an aqueous hot melt adhesive solution.

[0102] The aqueous hot melt adhesive solution was coated on a high-density polyethylene spunbond nonwoven fabric substrate (Tyvek ® 2FS), and dried at 100° C. for 3 minutes to form an aqueous hot melt adhesive coating on the high-density polyethylene spunbond nonwoven fabric substrate to prepare an aqueous hot melt adhesive coated nonwoven fabric.

[0103] The obtained water-based hot melt adhesive coated nonwoven fabric was subjected to air permeability test, peeling test, heat sealing strength test and reliability test according to the method described below. The test results are shown in Table 1 below.

[0104] Example 9

[0105] 29.764 parts by weight of polyethylene latex (WPE-09838), 1.09 parts by weight of polyethylene ionomer latex (S500), 0.92 parts by weight of paraffin wax (CER-497), 3.19 parts by weight of Fischer-Tropsch synthetic powder wax (Sasolwax Spray30G-M), 3.19 parts by weight of C9 petroleum resin powder (Cleartack ® W-140), 0.05 parts by weight of a dispersant (BYK-3450), 1.53 parts by weight of a thickener (AS-1125), 0.03 parts by weight of a defoamer (BYK-025) and 35.8 parts by weight of deionized water were mixed and stirred for 1 hour to uniformly disperse them to form an aqueous hot melt adhesive solution.

[0106] The aqueous hot melt adhesive solution was coated on a high-density polyethylene spunbond nonwoven fabric substrate (Tyvek ®2FS), and dried at 100° C. for 3 minutes to form an aqueous hot melt adhesive coating on the high-density polyethylene spunbond nonwoven fabric substrate to prepare an aqueous hot melt adhesive coated nonwoven fabric.

[0107] The obtained water-based hot melt adhesive coated nonwoven fabric was subjected to air permeability test, peeling test, heat sealing strength test and reliability test according to the method described below. The test results are shown in Table 1 below.

[0108] Example 10

[0109] 29.76 parts by weight of polyethylene latex (WPE-09838), 1.11 parts by weight of polyethylene ionomer latex (S500), 1.53 parts by weight of paraffin wax (CER-497), 3.06 parts by weight of Fischer-Tropsch synthetic powder wax (Sasolwax Spray30G-M), 3.06 parts by weight of C9 petroleum resin powder (Cleartack ® W-140), 0.05 parts by weight of a dispersant (BYK-3450), 1.46 parts by weight of a thickener (AS-1125), 0.03 parts by weight of a defoamer (BYK-025) and 35.78 parts by weight of deionized water were mixed and stirred for 1 hour to uniformly disperse them to form an aqueous hot melt adhesive solution.

[0110] The aqueous hot melt adhesive solution was coated on a high-density polyethylene spunbond nonwoven fabric substrate (Tyvek ® 2FS), and dried at 100° C. for 3 minutes to form an aqueous hot melt adhesive coating on the high-density polyethylene spunbond nonwoven fabric substrate to prepare an aqueous hot melt adhesive coated nonwoven fabric.

[0111] The obtained water-based hot melt adhesive coated nonwoven fabric was subjected to air permeability test, peeling test, heat sealing strength test and reliability test according to the method described below. The test results are shown in Table 1 below.

[0112] Embodiment 11

[0113] 29.76 parts by weight of polyethylene latex (WPE-09838), 1.31 parts by weight of polyethylene ionomer latex (S300), 0.62 parts by weight of paraffin wax (CER-497), 3.25 parts by weight of Fischer-Tropsch synthetic powder wax (Sasolwax Spray30G-M), 3.25 parts by weight of C9 petroleum resin powder (Cleartack ® W-140), 0.05 parts by weight of a dispersant (BYK-3450), 1.66 parts by weight of a thickener (AS-1125), 0.03 parts by weight of a defoamer (BYK-025) and 35.64 parts by weight of deionized water were mixed and stirred for 1 hour to uniformly disperse them to form an aqueous hot melt adhesive solution.

[0114] The aqueous hot melt adhesive solution was coated on a high-density polyethylene spunbond nonwoven fabric substrate (Tyvek ® 2FS), and dried at 100° C. for 3 minutes to form an aqueous hot melt adhesive coating on the high-density polyethylene spunbond nonwoven fabric substrate to prepare an aqueous hot melt adhesive coated nonwoven fabric.

[0115] The obtained water-based hot melt adhesive coated nonwoven fabric was subjected to air permeability test, peeling test, heat sealing strength test and reliability test according to the method described below. The test results are shown in Table 1 below.

[0116] Example 12

[0117] 29.76 parts by weight of polyethylene latex (WPE-09838), 1.32 parts by weight of polyethylene ionomer latex (S300), 0.91 parts by weight of paraffin wax (CER-497), 3.18 parts by weight of Fischer-Tropsch synthetic powder wax (Sasolwax Spray30G-M), 3.18 parts by weight of C9 petroleum resin powder (Cleartack ® W-140), 0.05 parts by weight of a dispersant (BYK-3450), 1.67 parts by weight of a thickener (AS-11125), 0.03 parts by weight of a defoamer (BYK-025) and 35.5 parts by weight of deionized water were mixed and stirred for 1 hour to uniformly disperse them to form an aqueous hot melt adhesive solution.

[0118] The aqueous hot melt adhesive solution was coated on a high-density polyethylene spunbond nonwoven fabric substrate (Tyvek ® 2FS), and dried at 100° C. for 3 minutes to form an aqueous hot melt adhesive coating on the high-density polyethylene spunbond nonwoven fabric substrate to prepare an aqueous hot melt adhesive coated nonwoven fabric.

[0119] The obtained water-based hot melt adhesive coated nonwoven fabric was subjected to air permeability test, peeling test, heat sealing strength test and reliability test according to the method described below. The test results are shown in Table 1 below.

[0120] Embodiment 13

[0121] 29.76 parts by weight of polyethylene latex (WPE-09838), 1.3 parts by weight of polyethylene ionomer latex (S300), 3.06 parts by weight of Fischer-Tropsch synthetic powder wax (Sasolwax Spray 30G-M), 1.53 parts by weight of paraffin wax (CER-497), 3.06 parts by weight of C9 petroleum resin powder (Cleartack ®W-140), 0.05 parts by weight of a dispersant (BYK-3450), 1.61 parts by weight of a thickener (AS-1125), 0.03 parts by weight of a defoamer (BYK-025) and 35.45 parts by weight of deionized water were mixed and stirred for 1 hour to uniformly disperse them to form an aqueous hot melt adhesive solution.

[0122] The aqueous hot melt adhesive solution was coated on a high-density polyethylene spunbond nonwoven fabric substrate (Tyvek ® 2FS), and dried at 100° C. for 3 minutes to form an aqueous hot melt adhesive coating on the high-density polyethylene spunbond nonwoven fabric substrate to prepare an aqueous hot melt adhesive coated nonwoven fabric.

[0123] The obtained water-based hot melt adhesive coated nonwoven fabric was subjected to air permeability test, peeling test, heat sealing strength test and reliability test according to the method described below. The test results are shown in Table 1 below.

[0124] Embodiment 14

[0125] 29.76 parts by weight of polyethylene latex (WPE-09838), 1.09 parts by weight of polyethylene ionomer latex (S500), 0.92 parts by weight of paraffin wax (CER-497), 3.19 parts by weight of Fischer-Tropsch synthetic powder wax (Sasolwax Spray30G-M), 3.19 parts by weight of C9 petroleum resin powder (Cleartack ® W-140), 0.05 parts by weight of a dispersant (BYK-3450), 1.53 parts by weight of a thickener (AS-1125), 0.03 parts by weight of a defoamer (BYK-025) and 35.8 parts by weight of deionized water were mixed and stirred for 1 hour to uniformly disperse them to form an aqueous hot melt adhesive solution.

[0126] The aqueous hot melt adhesive solution was coated on a high-density polyethylene spunbond nonwoven fabric substrate (Tyvek ® 2FS), and dried at 100° C. for 3 minutes to form an aqueous hot melt adhesive coating on the high-density polyethylene spunbond nonwoven fabric substrate to prepare an aqueous hot melt adhesive coated nonwoven fabric.

[0127] The obtained water-based hot melt adhesive coated nonwoven fabric was subjected to air permeability test, peeling test, heat sealing strength test and reliability test according to the method described below. The test results are shown in Table 1 below.

[0128] Comparative Example 1

[0129] 7.68 parts by weight of styrene-butadiene rubber (DL 326PA), 7.2 parts by weight of ethylene acrylic acid copolymer latex (Michem ®Prime 4983-40R), 1.6 parts by weight of ethylene-vinyl acetate copolymer latex (VINNAPAS ® EAF-68), 7.52 parts by weight of C9 petroleum resin powder (Cleartack ® W-140), 0.06 parts by weight of dispersant (TEGO ® Wet240), 0.04 parts by weight of a defoamer (BYK-025) and 41.6 parts by weight of deionized water were mixed and stirred for 1 hour to uniformly disperse them to form an aqueous hot melt adhesive solution.

[0130] The aqueous hot melt adhesive solution was coated on a high-density polyethylene spunbond nonwoven fabric substrate (Tyvek ® 2FS), dried at 80°C for 2 minutes to form a 10.0 g / m 2 Aqueous hot melt adhesive coating is used to prepare an aqueous hot melt adhesive coated nonwoven fabric.

[0131] The obtained water-based hot melt adhesive coated nonwoven fabric was subjected to air permeability test, peeling test, heat sealing strength test and reliability test according to the method described below. The test results are shown in Table 1 below.

[0132] Comparative Example 2

[0133] 29.76 parts by weight of polyethylene latex (WPE-09838), 3.23 parts by weight of Fischer-Tropsch wax powder (Sasolwax Spray 30G-M), 3.23 parts by weight of C9 petroleum resin powder (Cleartack ® W-140), 0.05 parts by weight of a dispersant (BYK-3450), 1.24 parts by weight of a thickener (AS-1125), 0.03 parts by weight of a defoamer (BYK-025) and 33.54 parts by weight of deionized water were mixed and stirred for 1 hour to uniformly disperse them to form an aqueous hot melt adhesive solution.

[0134] The aqueous hot melt adhesive solution was coated on a high-density polyethylene spunbond nonwoven fabric substrate (Tyvek ® 2FS), and dried at 100° C. for 3 minutes to form a water-based hot melt adhesive coating on the high-density polyethylene spunbond non-woven fabric substrate to prepare a water-based hot melt adhesive coated non-woven fabric.

[0135] The obtained water-based hot melt adhesive coated nonwoven fabric was subjected to air permeability test, peeling test, heat sealing strength test and reliability test according to the method described below. The test results are shown in Table 1 below.

[0136] The evaluation methods for coating weight measurement, air permeability test, peel test evaluation, heat seal strength test and reliability test are as follows:

[0137] Coating coating amount measurement: Using a circular cutter (Sample Cutter 240 / 100, purchased from Hans Schmidt & CoGmbH, Germany), according to the test standard of EN ISO 536, the weight of the aforementioned water-based hot melt adhesive coated non-woven fabric and the uncoated high-density polyethylene spunbond non-woven fabric substrate were measured respectively. The weight of the two was subtracted and divided by the coating area to obtain the coating amount of the water-based hot melt adhesive coating, and its unit is grams per square meter g / m 2 (gsm).

[0138] Air permeability test: using an air permeability tester (Model 4980-D, purchased from Liansheng Instruments), according to the test standard of TAPPI T-460, the average number of seconds required for 100cc of air to pass through the aforementioned water-based hot melt adhesive coated nonwoven fabric was measured.

[0139] Measurement of the sealing strength of Examples 1 to 13: A high-density polyethylene (HDPE) film, Teflon cloth and the water-based hot melt adhesive coated non-woven fabric of Examples 1 to 13 were heat pressed using a heat sealing tester (BS-25, purchased from Dam Precision Machinery). The upper plate temperature was set to 123 degrees Celsius, the lower plate temperature was set to room temperature, the heat sealing pressure was set to 5 kg and the pressing seconds were set to 1.5 seconds. The resulting heat-sealed composite was cut into 15 mm wide strips of test pieces, and the maximum tensile force was measured using a tensile tester (AI-3000, purchased from Gaotie Technology) according to the test standard of ASTM F-88, which was the initial sealing strength.

[0140] Measurement of the sealing strength of Example 14: The PETG rigid blister and the water-based hot melt adhesive coated nonwoven fabric of Example 14 were heat pressed by a blister machine (WSB400HLS, purchased from Weisheng Company). The temperature was set to 120 degrees, the heat sealing pressure was 5.5 kg, and the pressing seconds were 6 seconds. The obtained heat-sealed composite product was cut into 15 mm wide strip specimens, and the maximum tensile value was measured according to the ASTM F-88 test standard using a tensile testing machine (AI-3000, purchased from Gaotie Technology). It is the initial sealing strength.

[0141] Peeling test: The HDPE film or PETG rigid foam shell in the aforementioned heat-sealed synthetic product is torn off from the water-based hot melt adhesive coated non-woven fabric by hand, and the high-density polyethylene spunbond non-woven fabric substrate after tearing is visually observed to see whether there is fiber peeling. If no fiber peeling is found on the surface of the substrate, it is evaluated as 0, and if fiber peeling is found on the surface of the substrate, it is evaluated as ×.

[0142] Reliability test:

[0143] Heat-sealed samples were prepared according to the aforementioned sealing strength test method, and placed in a reliability test oven at 65°C. The samples were taken out after 4 weeks and the maximum tensile force after time was measured according to the ASTM-F-88 test standard, and the change in the maximum tensile force compared to the initial sealing strength was calculated.

[0144] Table 1: Coating amount, air permeability, peeling test, heat sealing strength and reliability test results of water-based hot melt adhesive coated nonwoven fabrics of the embodiment and comparative example

[0145] Examples / Comparative Examples Coating weight (gsm) Air permeability(s) Peel test Initial sealing strength (gf / 15mm) Sealing strength after reliability test (gf / 15mm) Change in sealing strength Example 1 13.7 56 〇 271 273 +2 Example 2 17.4 144 〇 383 322 -61 Example 3 11.9 160 〇 388 322 -66 Example 4 17.5 58 〇 368 343 -25 Example 5 14.3 104 〇 286 285 -1 Example 6 16.3 96 〇 334 334 0 Example 7 14.5 95 〇 368 349 -19 Example 8 15.5 100 〇 312 342 +30 Example 9 17.7 78 〇 432 358 -74 Example 10 17.2 76 〇 333 367 +34 Embodiment 11 17.3 92 〇 329 317 -12 Example 12 16.9 85 〇 389 404 +15 Embodiment 13 17.2 92 〇 355 332 -23 Embodiment 14 17.7 73 〇 730 358 -12 Comparative Example 1 10.0 60 × 158 - - Comparative Example 2 18.3 61 〇 374 211 -163

[0146] As can be seen from Table 1, the water-based hot melt adhesive coated non-woven fabrics prepared in Examples 1 to 14 not only have good air permeability, but also have sufficient sealing strength after heat sealing with HDPE film or PETG rigid blister. At the same time, when the HDPE film or PETG rigid blister is torn off, the high-density polyethylene spunbond non-woven fabric substrate will not have the problem of fiber detachment. In addition, the water-based hot melt adhesive coated non-woven fabrics prepared in Examples 1 to 14 can have good weather resistance. After reliability testing, the sealing strength has not increased or decreased excessively, and the necessary physical properties as medical packaging materials are still maintained. The water-based hot melt adhesive coated non-woven fabric in Comparative Example 1 had a fiber peeling problem when it was torn off the HDPE film, so no subsequent testing was performed. The sealing strength of the water-based hot melt adhesive coated non-woven fabric in Comparative Example 2 dropped significantly after the reliability test, which is not conducive to use as a medical packaging material.

[0147] Although the present invention has been disclosed as above by the embodiments, it is not intended to limit the present invention. Any person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be based on the scope defined by the claims.

Claims

1. A water-based hot melt adhesive comprising: 20 to 60 parts by weight of a hydrophilically modified waterborne polyolefin resin; 1 to 30 parts by weight of an aqueous ionomer; 10 to 30 parts by weight of powdered wax; and 10 to 30 parts by weight of a powder thickener.

2. The water-based hot melt adhesive according to claim 1, wherein the total amount of the powder of the water-based hot melt adhesive accounts for 30wt% to 55wt% of the total weight of the water-based hot melt adhesive.

3. The water-based hot melt adhesive according to claim 1, wherein the water-based hot melt adhesive comprises: 24 to 58 parts by weight of the hydrophilically modified waterborne polyolefin resin; 2 to 28 parts by weight of the aqueous ion polymer; 15 to 27 parts by weight of the powder wax; and 15 to 27 parts by weight of the powder thickener; The total amount of powder of the water-based hot melt adhesive accounts for 32wt% to 52wt% of the total weight of the water-based hot melt adhesive.

4. The water-based hot melt adhesive according to claim 1, wherein the particle size of the powder wax is between 3 microns and 20 microns. 5 . The water-based hot melt adhesive according to claim 1 , wherein the particle size of the powdered tackifier is between 3 μm and 35 μm. 6 . The water-based hot melt adhesive according to claim 1 , wherein the weight ratio of the powder wax to the powder tackifier is between 0.6:1 and 3:

1.

7. The water-based hot melt adhesive according to claim 1, wherein the glass transition temperature of the hydrophilically modified water-based polyolefin resin is less than 0°C and the melting point is higher than 90°C, the glass transition temperature of the water-based ionomer is less than 0°C and the melting point is higher than 80°C, the glass transition temperature of the powder wax is less than 0°C and the melting point is between 70°C and 180°C, and the glass transition temperature of the powder tackifier is greater than 0°C and the melting point is between 90°C and 160°C. 8 . The water-based hot melt adhesive according to claim 1 , wherein the glass transition temperature of the water-based hot melt adhesive is between -120° C. and -50° C.

9. The water-based hot melt adhesive according to claim 1, wherein the hydrophilically modified water-based polyolefin resin is selected from the group consisting of water-based polyethylene resin, water-based polypropylene resin, water-based polybutylene resin and water-based oxidized polyethylene resin or a combination thereof. 10 . The water-based hot melt adhesive according to claim 1 , wherein the water-based ionomer is selected from the group consisting of polyethylene ionomer, polypropylene ionomer, polyurethane ionomer and polystyrene butadiene ionomer or a combination thereof. 11 . The water-based hot melt adhesive according to claim 1 , wherein the powder wax is selected from the group consisting of Fischer-Tropsch synthesis powder wax, polypropylene powder wax, polyethylene powder wax, oxidized polyethylene powder wax and microcrystalline wax, or a combination thereof.

12. The water-based hot melt adhesive according to claim 1, wherein the powder tackifier is selected from the group consisting of C5 petroleum resin powder, C9 petroleum resin powder and C5 / C9 copolymer petroleum resin powder or a combination thereof.

13. The aqueous hot melt adhesive according to claim 1, further comprising aqueous paraffin wax.

14. The aqueous hot melt adhesive according to claim 13, wherein the hot melt adhesive further comprises 1 to 10 parts by weight of the aqueous paraffin.

15. A water-based hot melt adhesive coated nonwoven fabric, comprising an olefin-based spunbonded nonwoven fabric substrate and a water-based hot melt adhesive coating formed on at least one surface of the olefin-based spunbonded nonwoven fabric substrate, wherein the water-based hot melt adhesive configured to form the water-based hot melt adhesive coating comprises: 20 to 60 parts by weight of a hydrophilically modified waterborne polyolefin resin; 1 to 30 parts by weight of an aqueous ionomer; 10 to 30 parts by weight of powdered wax; and 10 to 30 parts by weight of a powder thickener.

16. The water-based hot melt adhesive coated non-woven fabric according to claim 15, wherein the air permeability of the water-based hot melt adhesive coated non-woven fabric is less than 170 seconds and the sealing strength is greater than 265g / 15mm.

17. The water-based hot melt adhesive coated nonwoven fabric according to claim 15, wherein the coating amount of the water-based hot melt adhesive on the olefin-based spunbond nonwoven fabric substrate is between 10 g / m 2 Up to 20g / m 2 between.