CN106832539B

CN106832539B - Disposable absorption article

Info

Publication number: CN106832539B
Application number: CN201611123602.1A
Authority: CN
Inventors: 孙晓丽; 翁文伟
Original assignee: Fujian Hengan Hygiene Material Co ltd; Hengan Fujian Holding Group Co Ltd; Fujian Hengan Household Life Article Co Ltd
Current assignee: Fujian Hengan Hygiene Material Co ltd; Hengan Fujian Holding Group Co Ltd; Fujian Hengan Household Life Article Co Ltd
Priority date: 2016-12-08
Filing date: 2016-12-08
Publication date: 2021-05-04
Anticipated expiration: 2036-12-08
Also published as: CN106832539A

Abstract

The utility model provides a disposable absorption articles for use, from the top down include that liquid top layer, absorption core, liquid-tight bottom and syndiotactic release film, this syndiotactic release film, include non-release district (1) and release district (2), its characterized in that: the non-release zone (1) comprises a delustered polyolefin resin, a metallocene-produced alpha-olefin polymer resin, and a C4-C14 polyolefin resin produced by a Z-N catalyst; the release zone (2) contains fluorosilicone resin and C4-C14 polyolefin resin produced by Z-N catalyst. The heat seal strength of the non-release area (1) of the syndiotactic release film is more than or equal to 2.5N/inch, the glossiness is less than 30 percent, the peeling force of the release area (2) is 10.0-20gf/inch, and the residual bonding rate of release is more than or equal to 80 percent. Compared with the prior art, the syndiotactic release film has the effects of surface extinction, static resistance, high heat seal strength and release and adhesion prevention, and can effectively prevent the back adhesive of the sanitary product from being lose-adhered or transferring.

Description

Disposable absorption article

Technical Field

The invention relates to a disposable absorption article, in particular to a disposable absorption article containing a syndiotactic release film capable of replacing the traditional release paper/film.

Background

Release papers/films, which function primarily to isolate adhesive materials, have been widely used as protective layer materials for backsize in sanitary napkins, diapers, and incontinence products.

The invention patent application with publication number CN1358625A discloses a heat-seal anti-sticking release paper and a manufacturing method thereof, and provides a heat-seal anti-sticking release paper which can be anti-sticking without a barrier paper, can be self-sealed by self-adhesion after pressurization and heating and can be used for packaging women sanitary products very quickly. In the invention, the packaging material layer is web, the isolating layer is a silicon oil layer, and the middle part is a hot melt adhesive layer.

The invention patent application publication No. CN103282415A discloses a release film used as a temporary support for an adhesive object, and more particularly, to a silicon release composition having excellent antistatic property and a polyester release film having excellent antistatic property and excellent peeling force obtained by coating the silicon release composition on a polyester base film.

The invention patent application with publication number CN1041395688A discloses a release film, which belongs to the technical field of packaging materials, and particularly relates to a release film, which is characterized in that: the silicone oil adhesive layer, the supporting layer and the auxiliary layer are integrated by co-extrusion and bidirectional stretching, and the mass ratio of the silicone oil adhesive layer to the supporting layer to the auxiliary layer is 1.5:7: 1.5; and after the longitudinal stretching of the biaxial stretching, coating silicon oil on the surface of the silicon oil adhesion layer to form a silicon oil layer, wherein the thickness of the silicon oil layer is 2 um.

The main problems of the release paper/film are that: 1. adopting common release base paper, spraying or coating polyethylene or polypropylene film, and coating organic silicon; or coating with silicone oil after coating with primer to achieve anti-sticking effect and stripping performance. Solvent-type organic silicon is generally adopted in the industry, and although the use is convenient, a large amount of solvent is remained in a processed product, so that the environmental pollution and the health are easily caused; 2. factors such as coating technology, silicone oil quality, base material condition, coating amount and the like directly influence the quality of the release product, and the product quality stability is poor; 3. the surface resistance of the release paper/film coated with the organic silicon release agent is high, and static electricity is easily generated on the surface of the release paper/film through friction in the processing process, so that dust and other impurities in the air are adsorbed, and the attractiveness of the product is influenced; 4. most release paper/film manufacturers in China have the problems of non-uniform silicon coating, non-adjustable peeling force, low residual bonding rate and the like.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a disposable absorption article which comprises a liquid permeable top layer, an absorption core body, a liquid impermeable bottom layer and a syndiotactic release film from top to bottom, wherein the syndiotactic release film has the functions of extinction surface, static resistance, high heat seal strength and stable release peeling force and is suitable for the disposable absorption article. This syndiotactic release film has better stability, and even remain the bonding rate under the effect of external high temperature and also can not reduce by a wide margin, the phenomenon that the gum loses the viscosity can not appear, has greatly improved the stability with the gum adhesion. The syndiotactic release film can replace the traditional release film/paper to improve the quality of the disposable absorbent article.

The invention provides a syndiotactic release film in a disposable absorption article, which comprises a non-release area and a release area and is characterized in that: the non-release zone comprises a delustered polyolefin resin, a metallocene-produced alpha-olefin polymer resin, and a C4-C14 polyolefin resin produced by a Z-N catalyst; the release zone comprises C4-C14 polyolefin resin produced by Z-N catalyst and fluorosilicone resin. The heat seal strength of a non-release area of the syndiotactic release film is more than or equal to 2.5N/inch, the glossiness is less than 30 percent, the peeling force of the release area is 10.0-20gf/inch, and the residual bonding rate of release is more than or equal to 80 percent.

The non-release area of the syndiotactic release film comprises 0.5wt% -1.5wt% of antistatic agent. Plastics are generally electrically insulating, e.g. Polyethylene (PE), polypropylene (PP) with a surface resistance of typically 10¹⁶-10²⁰Omega, the plastic film generates static electricity by rubbing with the roller in the production process, and is not easy to eliminate. Due to the electrostatic effect, the plastic film can adsorb dust and other impurities in the air, thereby affecting the beauty of the film product. Because of the influence of static electricity, the adhesion phenomenon can occur between the film layers in the production, use and storage processes of the plastic film, so that the film is difficult to effectively separate from the filmAnd the separation, resulting in difficulty in unwinding. The conventional antistatic agent is composed of a small molecular surfactant, which contains a hydrophilic group and an oleophilic group and has poor compatibility with resin, and the antistatic agent migrates from the inside of the resin to the surface. The traditional antistatic agent can only act under a certain humidity condition, and the hydrophilic group of the traditional antistatic agent can promote the surface of the plastic to be wetted by water, so that static charges are dredged, and the surface resistivity of the plastic is reduced. The antistatic agent can only work after the molecules of the traditional antistatic agent migrate to the surface, and the molecules of the antistatic agent in the plastic continuously migrate to the surface until the molecules are completely consumed, so that the effect is only effective within a certain time range. The preferred antistatic agents of the present invention are permanent antistatic agents. After the permanent antistatic agent and the polymer matrix are blended, due to the fact that the movement capacity of molecular chains of the antistatic agent is high, on one hand, protons can move conveniently among the molecules, and generated static charges are conducted and released through ion conduction; on the other hand, the antistatic ability is exhibited by its particular dispersed form. The polymer permanent antistatic agent is mainly distributed in a fine layer or a rib shape in a non-release region of a product to form a conductive non-release region, and is distributed in a nearly spherical shape in a central part to form a so-called core-shell structure, and static charge is leaked by using the core-shell structure as a passage. The permanent antistatic agent can form a fibrous conductive network in the polymer, can lead static charges accumulated on the surface of the polymer out, and can permanently eliminate the charges on the surfaces of various polymers. The increase of the addition amount of the antistatic agent not only increases the product cost, but also brings adverse effects to the processing procedure in the later stage. The antistatic agent contained in the non-release region of the present invention is preferably a thermoplastic permanent type antistatic agent synthesized based on polyamide and polyether hindered amine. The invention is most preferably a BASF permanent antistatic agent Irgastat P18, added in an amount of 0.5wt% to 1.5 wt%.

The non-release area of the syndiotactic release film comprises 20-40 wt% of matting resin. There are generally two ways to achieve scattering extinction: firstly, the surface of the product is scattered to be extinction, and secondly, the scattering from the reinforced product body is extinction. Surface scattering is achieved by increasing the surface roughness of the article. A large number of experiments show that: melt Index (MI) can affect the extinction properties of the article when polymerizedThe olefin resin has the best gloss at a Melt Index (MI) of 1-5g/10min and the best extinction effect at 0.2-0.3g/10 min; the Molecular Weight Distribution (MWD) also affects the film matting properties, and a resin film having a broader molecular weight distribution has a lower gloss due to increased surface irregularities of the material. The extinction mechanism of the film prepared by the single-component resin is surface scattering caused by the rough surface of the film, and the rough surface is caused by the accumulation of crystal grains in a near-surface body. A large number of experimental results show that the extinction characteristic of the polyolefin extinction film is mainly caused by the rough surface of the film, and the preferable melt index in the invention is 0.25-0.5g/10min, and the density is 0.920-0.930g/cm³The LLDPE of (1). The extinction resin has the advantages that the surface of the film is provided with rough and concave surfaces, which is beneficial to reducing the adhesion between films and facilitating the unwinding of the film. The gloss of a non-release area of the syndiotactic release film prepared by the invention is less than 30%, the heat seal strength is more than or equal to 2.5N/inch, and the width is 10-20 mm.

The non-release zone of the present invention further comprises from 35wt% to 70wt% of a metallocene-produced alpha-olefin polymer resin which is a metallocene polyethylene or polypropylene or a combination of both having a broad molecular weight distribution and/or a multimodal molecular weight distribution. The alpha-olefin polymer resin produced by metallocene has the advantages of high purity, good transparency, low heat-sealing initial temperature and good heat-sealing strength. Disadvantages are the difficulty of processing due to the general absence of long chain branches, narrow component distribution, lack of low molecular weight "lubricants" and low entanglement of high component "toughener" chains. The optimized metallocene polyolefin resin with wide molecular weight distribution and/or multimodal molecular weight distribution in the invention contains both short polymer molecular chains and long polymer molecular chains, wherein the short molecular chains can play a role in lubricating molecules, so that the processing performance of the product is improved, the long molecular chains ensure the mechanical strength of the product, and when a non-release area of a syndiotactic release film is sealed with a bottom layer of the syndiotactic release film, the metallocene polyolefin resin has good heat sealing performance, and can meet the requirement of short sealing time in high-speed production of hygienic products. The polymer resin with wide molecular weight distribution and/or multimodal molecular weight distribution has wider molecular weight distribution, not only has the excellent performance of metallocene polymer, but also has good processing performance of Z-N catalyst polymer, and realizes complementary advantages. A large number of experiments show that: the metallocene-produced alpha-olefin polymer resin has good heat sealing and processability when blended at 35wt% to 70wt% and 5wt% to 45wt% of a C4-C14 polyolefin resin, and has a molecular weight distribution (Mw/Mn) of about 5.0 to 20.0.

The traditional release agent is coated by adopting organic silicon, so that the gum is easy to lose adhesion or transfer, and the reason is as follows: 1. the silicone release agent is transferred to the backing adhesive. The organic silicon release agent is transferred to the back glue, and the surface tension of the organic silicon is 19.1dyn/cm²Thus, if the silicone release agent is transferred to the backsize, it will directly cause the backsize to lose adhesion; 2. and (3) reacting the organic silicon release agent with the gum. The separant contains a platinum catalyst, wherein platinum is a C = C double bond addition catalyst, and the main raw material of the hot melt adhesive is SIS or SBS, a thermoplastic elastomer and the like, which contains C = C double bonds; if the organosilicon is not completely cured, the methyl barrier effect is poor, the platinum catalyst is easily contacted with the back adhesive, so that C = C double bonds in the back adhesive are added, thermoplastic elastomers such as SIS or SBS and the like are converted from a rubber state to a glass state, the viscoelasticity is lost, and the pressure sensitivity of the back adhesive is lost; 3. the gum is transferred to the release paper, mainly because the silicone coating amount on the release paper is too small or the silicone coating is omitted, and the gum is transferred to the release agent due to the interaction of the gum and the primer.

The release region of the syndiotactic release film comprises fluorosilicone resin and polyolefin resin. The fluorine-silicon polymer main chain contains-Si-O-with the characteristics of organosilicon, so that the fluorine-silicon polymer has the excellent physicochemical properties of organosilicon, such as low glass transition temperature, low surface tension, surface energy and the like; the side chain-linked fluoroalkyl groups provide oil and solvent resistance to the fluoropolymer. As the copolymer composition, the fluorosilicone resin can also effectively improve the surface wetting property of the polymer. The invention selects the fluorosilicone resin, so that the fluorine-containing silicone resin has good release effect and can solve the problem of high price of the organic fluororesin. A large number of tests show that the compatibility of the fluorosilicone resin and the matrix resin must be considered when selecting the fluorosilicone resin. If the compatibility is poor, the performance of the product is poor, but if the compatibility is too good, the migration speed of the fluorine silicon to the surface is too slow, and a release region is difficult to form. The increase of the content of fluorosilicone affects the processability and release effect of the composition, so that the content of fluorosilicone resin must be controlled. The fluorosilicone resin in the release region is an organic fluorine modified polysiloxane polymer with medium and high molecular weight, can resist the high temperature of more than 300 ℃ and is formed by self-crosslinking. The density of the preferred fluorine-silicon resin is 0.90-0.95, the viscosity is 500-1000cps, the content of effective substances is 50 +/-2%, and the addition amount is 5-10 wt%. The width of a release area of the prepared syndiotactic release film is 5-15mm, the peeling force is 10.0-20gf/inch, and the residual bonding rate of release is more than or equal to 80%.

The invention has the beneficial effects that: according to the syndiotactic release film provided by the invention, the heat seal strength of a non-release area is more than or equal to 2.5N/inch, the glossiness is less than 30%, the peeling force of the release area is 10.0-20gf/inch, and the residual bonding rate of release is more than or equal to 80%. Compared with the prior art, the syndiotactic release film has the effects of extinction, static resistance, high heat seal strength and release and adhesion prevention, and can effectively prevent the back adhesive of the sanitary product from being lose-adhered or adhesive transfer.

Another object of the present invention is to provide a method for preparing the above syndiotactic release film, comprising the steps of:

1) blending raw materials of all layers in proportion, respectively placing the raw materials of a non-release area and a release area in an A, B screw of a bi-component colored bar blow molding extruder through a metering device, and adjusting the extrusion thickness according to requirements.

2) The syndiotactic release film product is prepared by the working procedures of extrusion, cooling, corona, rolling and the like.

The invention adopts the conventional production process and production equipment in the field for production, belongs to the known technology and is not described herein again.

Drawings

FIG. 1 is a schematic view of a syndiotactic release film in accordance with the present invention.

1-non-release area and 2-release area.

Detailed Description

Example 1

A disposable absorption article comprises a liquid permeable top layer, an absorption core body, a liquid impermeable bottom layer and a syndiotactic release film from top to bottom.

The liquid permeable top sheet material was a through-air nonwoven of 168mm by 20gsm gauge, available from Yangjiang.

The absorbent core was a dust-free paper having a gauge of 168mm 60gsm and was purchased from Tianjin BBA.

The liquid impermeable backsheet was a breathable film having a gauge of 168mm 35gsm available from korea hans corporation.

The syndiotactic release film is a self-made material and comprises a non-release area (1) and a release area (2). The preparation method comprises the following steps: step 1, 0.5wt% of an antistatic agent Irgastat P18 (Basf), 20wt% of a matting resin FB2230(Borealis), 70wt% of a metallocene resin 5101(Dow chemical), and 9.5wt% of 2045G (Dow chemical) were weighed and mixed uniformly by a mixer, and identified as a 1-non-release zone material. Step 2, weighing 95 wt% of WtLLDPE-FS150A (Nippon Sumitomo) and 5wt% of fluorosilicone resin FSI-105, and uniformly mixing by a stirrer to obtain a material marked as a 2-release area material. And 3, respectively adding the materials obtained in the step 1 and the step 2 into A, B screws of a double-component colored bar blow molding extruder, and preparing a syndiotactic release film product through the working procedures of cooling, corona, winding and the like.

The liquid permeable top layer, the absorption core body and the liquid impermeable bottom layer are respectively bonded by hot melt adhesive DM5233/T103, and the glue applying mode is spiral glue spraying. The liquid-tight bottom film and the syndiotactic release film are bonded by hot melt adhesive HM-D, and the glue applying mode is intermittent glue scraping.

Example 2

The syndiotactic release film is a self-made material and comprises a non-release area (1) and a release area (2). The preparation method comprises the following steps: step 1, weighing 1.0wt% of an antistatic agent Irgastat P18 (Basf), 40wt% of a matting resin FB2230(Borealis), 19wt% of 2049P (Dow), and 40wt% of a metallocene resin EXCEED 1018 (Exxon), and mixing uniformly by a stirrer to obtain a 1-non-release zone material. Step 2, weighing 80wt% of FS153S (Nippon Sumitomo), 10wt% of fluorosilicone resin KX-501 and 10wt% of color master batch (self-made), and uniformly mixing by using a stirrer, wherein the materials are marked as 2-release zone materials. And 3, respectively adding the materials obtained in the step 1 and the step 2 into A, B screws of a double-component colored bar blow molding extruder, and preparing a syndiotactic release film product through the working procedures of cooling, corona, winding and the like.

Example 3

The syndiotactic release film is a self-made material and comprises a non-release area (1) and a release area (2). The preparation method comprises the following steps: step 1, weighing 1.5wt% of an antistatic agent Irgastat P18 (Basf), 30wt% of a delustering resin FB2230(Borealis), 33.5wt% of 1002kw (Exxon) and 35wt% of MarFlex D139, and uniformly mixing by a stirrer to obtain a 1-non-release zone material. Step 2, 87.5.5wt% of CA12A (basell), 7.5wt% of fluorosilicone KX-501 and 5% of white color masterbatch (self-made) are weighed and mixed uniformly by a stirrer, and the mixture is marked as a 2-release area material. And 3, respectively adding the materials obtained in the step 1 and the step 2 into A, B screws of a double-component colored bar blow molding extruder, and preparing a syndiotactic release film product through the working procedures of cooling, corona, winding and the like.

Absorbent articles samples

1, 2, 3 were made according to examples 1-3 and the test results are shown in table 1:

TABLE 1

The heat seal strength test method comprises the following steps: the test is carried out according to GB/T2358-1998 method for testing the heat seal strength of plastic film packaging bags, and the pressure is 300 KPa.

Peel force test method: the tesa7475 standard tape was attached to the release surface of the release film, rolled back and forth three times with a 2.5KG standard rubber roller, and left at room temperature (23 ± 2 ℃, relative humidity 50%) for 2 hours. The sample was then peeled 180 ° using an INSTRON tensile machine at 300mm/min, and the maximum and average peel force values were recorded. The results of the experiments are expressed in gf/inch, and each group should be not less than 3.

The method for testing the residual bonding rate comprises the following steps: a NITTO31B standard tape was longitudinally applied to a release film (release paper) sample and rolled back and forth three times with a 2kg standard automatic roll press. Placing the sample in an oven set to 70 ℃, aging for 20 hours under the pressure of a 2kg standard weight, and marking as sample 1; the NITTO31B standard tape is adhered to a Teflon plate, and no crease or air bubble is generated during adhesion. Rolling was performed three times back and forth using a standard automatic roller press. The sample was placed in an oven set at 70 ℃ and aged under a pressure of a 2kg standard weight for 20 hours, and labeled as sample 2.

Samples

1 and 2 were adhered to a standard stainless steel plate, rolled back and forth three times with a roller press, and left at room temperature (23. + -. 2 ℃ C., relative humidity 50%) for 2 hours. Then, 180 ℃ peeling was performed on an INSTRON tensile machine at a speed of 300mm/min to obtain data "F1" and "F2". And (3) calculating the result: residual adhesion = F1/F2 × 100%.

The syndiotactic release film is produced by utilizing the conventional production process and production equipment in the field, and can replace the conventional release paper/film to be applied to the back adhesive protective layer of the disposable absorption article. While the invention has been shown and described with reference to a few preferred embodiments thereof, the design concept of the present invention is not limited thereto, and various changes, omissions and additions to the form and detail thereof may be made therein without departing from the spirit and scope of the invention. It should be noted that some variants are possible within the scope of protection of the claims.

Claims

1. The utility model provides a disposable absorption articles for use, from the top down include that liquid top layer, absorption core, liquid-tight bottom and syndiotactic release liner from the type membrane, this syndiotactic release liner includes top layer, sandwich layer and release layer, its characterized in that: the non-release zone comprises a delustered polyolefin resin, a metallocene-produced alpha-olefin polymer resin, and a C4-C14 polyolefin resin produced by a Z-N catalyst; the release area comprises fluorosilicone resin and C4-C14 polyolefin resin produced by Z-N catalyst; the heat seal strength of a non-release area of the syndiotactic release film is more than or equal to 2.5N/inch, the glossiness is less than 30 percent, the peeling force of the release area is 10-20gf/inch, and the residual bonding rate of release is more than or equal to 80 percent; the non-release region contains 20 to 40 weight percent of extinction polyolefin resin and 35 to 70 weight percent of alpha-olefin polymer resin produced by metallocene; the alpha-olefin polymer resin produced by metallocene is metallocene polyethylene or polypropylene or the combination of the two, which has wide molecular weight distribution and/or multimodal molecular weight distribution, and the molecular weight distribution is 5.0-20.0.

2. The disposable absorbent article of claim 1 characterized in that said non-release region further comprises from 0.5 wt.% to 1.5 wt.% of an antistatic agent.

3. The disposable absorbent article of claim 2 wherein said antistatic agent is a thermoplastic permanent antistatic agent.

4. The disposable absorbent article of claim 1 wherein said release region comprises 60 wt% to 90 wt% polyolefin resin, 5wt% to 10wt% fluorosilicone resin, and 0wt% to 10wt% color concentrate.

5. The disposable absorbent article of claim 4 wherein said fluorosilicone resin is an organofluorine modified polyorganosiloxane polymer.

6. A method of making a disposable absorbent article according to any of claims 1 to 5, comprising the steps of:

1) providing a liquid-permeable top layer, an absorption core body, a liquid-impermeable bottom layer and a syndiotactic release film;

2) the syndiotactic release film is prepared by the following method, and the preparation method of the syndiotactic release film comprises the following steps:

blending raw materials of each layer in proportion, respectively placing the raw materials of a non-release area and a release area in an A, B screw of a bi-component colored bar blow molding extruder through a metering device, and adjusting the extrusion thickness according to the requirement;

extruding, cooling, corona and rolling to obtain a syndiotactic release film product;

3) the liquid permeable top layer, the absorption core body, the liquid impermeable bottom layer and the syndiotactic release film are overlapped and bonded from top to bottom.