CN112853611A - Water-repellent sisal non-woven fabric packaging bag material and preparation method thereof - Google Patents
Water-repellent sisal non-woven fabric packaging bag material and preparation method thereof Download PDFInfo
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- CN112853611A CN112853611A CN202011598609.5A CN202011598609A CN112853611A CN 112853611 A CN112853611 A CN 112853611A CN 202011598609 A CN202011598609 A CN 202011598609A CN 112853611 A CN112853611 A CN 112853611A
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/44—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling
- D04H1/46—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres
- D04H1/48—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres in combination with at least one other method of consolidation
- D04H1/488—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties the fleeces or layers being consolidated by mechanical means, e.g. by rolling by needling or like operations to cause entanglement of fibres in combination with at least one other method of consolidation in combination with bonding agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
- B32B37/065—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method resulting in the laminate being partially bonded
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- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4382—Stretched reticular film fibres; Composite fibres; Mixed fibres; Ultrafine fibres; Fibres for artificial leather
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2401/00—Physical properties
- D10B2401/02—Moisture-responsive characteristics
- D10B2401/021—Moisture-responsive characteristics hydrophobic
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2401/00—Physical properties
- D10B2401/06—Load-responsive characteristics
- D10B2401/063—Load-responsive characteristics high strength
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2401/00—Physical properties
- D10B2401/12—Physical properties biodegradable
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2505/00—Industrial
- D10B2505/10—Packaging, e.g. bags
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- Nonwoven Fabrics (AREA)
Abstract
The invention relates to a water-repellent sisal non-woven fabric packaging bag material and a preparation method thereof, wherein a needled fiber net is prepared by taking sisal short fibers and viscose short fibers as raw materials, polyurethane powder is uniformly scattered on the upper surface of the needled fiber net and then is subjected to hot rolling, then the needled fiber net is turned over, and polyurethane powder is scattered on the other surface of the needled fiber net and is subjected to hot rolling to obtain the water-repellent sisal non-woven fabric packaging bag material; the mass percentage of the sisal short fibers in the raw material in the needled fiber net is 30-50%; the powder spraying mass of the polyurethane powder is 3-8% of the mass of the needled fiber web each time; the hot rolling setting temperature in the non-woven process is 85-105 ℃, the hot rolling speed is 40-50 m/min, and the roller linear pressure is 150-250N/cm; the prepared water-repellent sisal non-woven fabric packaging bag material is of a three-layer structure, and the polyurethane powder has a bonding effect on the upper surface and the lower surface of the fiber net to form a continuous pore-free water-repellent film, so that the sisal non-woven fabric has water repellency, excellent breaking strength, bursting strength and wear resistance index, and can be used for water-repellent packaging bag materials.
Description
Technical Field
The invention belongs to the technical field of sisal non-woven fabrics, and relates to a water-repellent sisal non-woven fabric packaging bag material and a preparation method thereof.
Background
The sisal hemp short fiber is taken from the leaves of sisal hemp crops, is a lower foot of the sisal hemp fibers in the using process, mainly comprises three components of cellulose, lignin and hemicellulose, is a natural green degradable material, and has the characteristics of high strength, small elongation, large Young modulus and the like. The packaging bag material with excellent performance can be prepared by combining the excellent performance of the sisal short fiber with the non-woven processing technology, and has wide application prospect.
The viscose staple fiber belongs to regenerated cellulose fiber, is soft and high in elongation, is an excellent textile raw material, also has good biodegradability, and can be decomposed into carbon dioxide and water under natural conditions.
The existing sisal non-woven fabric mostly adopts a wet papermaking process, sisal fibers are pulped and mixed with wood pulp fibers, chemical fibers and a dispersing agent are added for wet papermaking to form a net, the water consumption is large, and the waste liquid treatment cost is high. In the processes of transportation, loading, unloading and storage, in order to prevent external rainwater and other liquids from permeating into the package and influencing the quality of the articles contained in the package, certain requirements are made on the waterproofness of the packaging material. But at the same time, because the sisal is hydrophilic fiber, the hygroscopicity is strong, the waterproofness is poor, and the sisal nonwoven fabric material has no waterproofness, so that the use requirement of the packaging bag is difficult to meet. Therefore, new requirements are put on the water repellency research of the sisal nonwoven fabric.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a water-repellent sisal non-woven fabric packaging bag material and a preparation method thereof.
The invention aims to provide a preparation method of a water-repellent sisal non-woven fabric packaging bag material, which comprises the steps of carrying out softening pretreatment on sisal short fibers, compounding the sisal short fibers with viscose short fibers to prepare a needle-punched fiber net, then scattering hot-melt polyurethane powder on the upper surface and the lower surface of the needle-punched fiber net, and carrying out hot rolling to form a film, thereby preparing the water-repellent sisal non-woven fabric packaging bag material.
The other purpose of the invention is to provide a water-repellent sisal non-woven fabric packaging bag material, wherein the upper surface and the lower surface of a needled fiber net are respectively covered with a layer of polyurethane water-repellent film. The polyurethane water repellent film and the needled fiber net are combined by chemical bonds, and the binding force is stable. The polyurethane water repellent film plays a role in water repellency, simultaneously strengthens the strength of the needled fiber web, and limits sisal short fibers and viscose short fibers which are entangled with each other in the needled fiber web, so that the needled fiber web is more stable. The surface density of the water-repellent sisal non-woven fabric packaging bag material is 90-120 g/m2The transverse breaking strength is 90-100N, the longitudinal breaking strength is 75-95N, the bursting strength is 70-90N, the wear-resisting index is 80-100 times/mg, and the water repellency grade is 3-4.
According to the preparation method of the water-repellent sisal non-woven fabric packaging bag material, firstly, sisal short fibers and viscose short fibers are used as raw materials to prepare a needled fiber net, then polyurethane powder is uniformly scattered on the upper surface of the needled fiber net and then subjected to hot rolling, then the needled fiber net is turned over, and polyurethane powder is scattered on the other surface of the needled fiber net and subjected to hot rolling to obtain the water-repellent sisal non-woven fabric packaging bag material;
the average diameter of the pores of the needled web is less than 150 μm;
the mass percentage of the sisal short fibers in the needle-punched fiber net is 30-50%;
the powder spraying mass of the polyurethane powder is 3-8% of the mass of the needled fiber web each time;
the hot rolling temperature is 85-105 ℃, the hot rolling speed is 40-50 m/min, and the roller line pressure is 150-250N/cm.
As a preferred technical scheme:
according to the preparation method of the water-repellent sisal non-woven fabric packaging bag material, the polyurethane powder is the reactive polyurethane hot melt adhesive, the average particle size is 150-300 mu m, and the melting point is 80-100 ℃.
According to the preparation method of the water-repellent sisal non-woven fabric packaging bag material, the transverse breaking strength of the needled fiber net is 30-50N, the longitudinal breaking strength is 25-40N, the bursting strength is 20-35N, and the wear resistance index is 15-30 times/mg.
The preparation method of the water-repellent sisal non-woven fabric packaging bag material comprises the following specific process flows:
(1) softening treatment: pretreating sisal hemp short fibers by adopting pretreatment liquid; placing the pretreated sisal fibers into organic silicon softener treatment liquid to chemically soften the sisal fibers; finally, kneading and extruding the sisal short fiber after chemical softening; the fineness of the treated sisal short fiber is reduced, the softness is improved, and the entanglement with the viscose short fiber in the non-weaving process is facilitated.
The pretreatment liquid comprises the following components in percentage by weight: h2O24-6 g/L concentration, 5-8 g/L concentration of NaOH, Na2SO3The concentration of Na is 1.5-2.5 g/L5P3O10The concentration is 2.5-3.5 g/L; the pretreatment process comprises the following steps: the bath ratio is 1: 10-15, the reaction time is 120-150 min, and the reaction temperature is 100-110 ℃.
The organic silicon softening agent treatment liquid has the concentration of 1-1.5%; the chemical softening process comprises the following steps: the temperature is 50-55 ℃, and the time is 120-180 min; the bath ratio is 1: 10-15.
Because the sisal fibers contain a large amount of non-cellulose substances such as hemicellulose, lignin, pectin and the like, the sisal fibers are thick, have small elasticity and large rigidity, are difficult to form a net by a dry method, and are difficult to tangle during needling reinforcement. During the non-woven process, the soft fibers are easier to web, and therefore the sisal fibers are subjected to a softening treatment. Firstly, preprocessing to remove non-cellulose substances, so that sisal short fibers become thin and the softness is improved; secondly, the softness of the sisal short fiber is further improved by combining chemical softening, rubbing and extruding treatment, and the sisal short fiber is more beneficial to intertwining with the viscose short fiber in the non-weaving process, so that the web forming property is improved.
(2) Compounding the sisal short fibers subjected to softening treatment with viscose short fibers, and then preliminarily mixing and uniformly mixing to prepare sheet cotton type mixed fibers;
preliminary mixing: compounding the treated sisal short fibers and viscose short fibers, and then feeding the mixture into a coarse opener for preliminary mixing;
and (3) uniformly mixing: conveying the primarily mixed fibers into a cotton storage box of a cotton mixing machine, conveying the primarily mixed fibers through a brad curtain, and allowing the primarily mixed fibers to enter a vibrating cotton box after the primarily mixed fibers are acted by a cotton homogenizing roller and a cotton stripping roller so as to uniformly mix the fibers; when the cotton is uniformly mixed, the speed of a fillet nail curtain of the cotton mixing machine is 45-80 m/min, the speed of a horizontal curtain is 0.3-0.7 m/min, the rotating speed of a cotton equalizing roller is 582-882 r/min, and the rotating speed of a cotton stripping roller is 412-686 r/min.
Mixed fiber made into banquet form: feeding the uniformly mixed fibers into a fine opener to further open the raw materials, and outputting the raw materials to an air pressure cotton box through an air pressure pipeline to form sheet cotton type mixed fibers;
(3) carding, lapping, disordered drafting and needling the banquet type mixed fibers to prepare a needled fiber web;
carding, namely carding the mixed fiber in the form of banquet cotton into a thin fiber web through a carding machine; in the carding process, the rotating speed of the licker-in is 600-900 r/min, the rotating speed of the cylinder is 300-500 r/min, the rotating speed of the doffer is 15-40 r/min, and the speed of the working roll is 670-960 r/min.
Lapping is to lap the thin fiber net by a lapping machine; the lapping mode is cross lapping;
the disorder drafting is to pass the laid fiber web through a disorder drafting machine to increase the disorder degree of the fiber web structure; the draft multiple in the messy draft process is 2.2-2.6;
the needling is to reinforce the fiber net by needling of a needling machine and wind the fiber net into a coil; the needling density in the needling process is 100-200 needling/cm2The needling depth is 6-8 mm, the needling frequency is 150-350 needling/min, and the number of needling channels is 2.
The invention also provides a water-repellent sisal non-woven fabric packaging bag material which is of a three-layer structure: the upper surface and the lower surface of the needle-punched fiber web of the sisal short fiber and viscose short fiber compound raw material are respectively covered with a layer of polyurethane water-repellent film.
As a preferred technical scheme:
according to the water-repellent sisal non-woven fabric packaging bag material, the polyurethane water-repellent film and the needled fiber net are combined through chemical bonds, and the binding force is stable.
The surface density of the water-repellent sisal non-woven fabric packaging bag material is 90-120 g/m2The transverse breaking strength is 90-100N, the longitudinal breaking strength is 75-95N, the bursting strength is 70-90N, the wear-resisting index is 80-100 times/mg, and the water repellency grade is 3-4.
The principle of the invention is as follows:
the viscose fiber adopted by the invention belongs to regenerated cellulose fiber, and has excellent spinning performance and weaving performance due to the softness and high elongation at break. The mixture of the slender and soft viscose fiber and the sisal fiber is beneficial to the formation of a net by the sisal non-woven fabric, and the uniformity of the fiber net is improved. The viscose staple fiber belongs to biodegradable materials, can be decomposed into carbon dioxide and water under natural conditions, and has no pollution to the environment.
In the prior art, after the disordered and drafted fiber net is needled, the strength is low, the wear resistance is poor, the surface is rough, and the requirements of packaging materials cannot be met. Therefore, the invention sprinkles hot melt polyurethane powder on the upper and lower surfaces of the needle-punched fiber net and then carries out surface heat setting so as to improve the strength and the wear resistance of the needle-punched fiber net. The molten polyurethane powder has isocyanate functional group capable of reacting with hydroxyl in sisal short fiber and viscose fiber molecule to form carbamate bond, and the carbamate bond is high strength covalent bond combination, can bond sisal fiber and viscose fiber, fixes needle punched fiber net and raises the strength of non-woven fabric. After the polyurethane powder is melted, a polyurethane film with a certain thickness is formed on the surface of the needle punched fiber net. Because the polyurethane has good wear resistance and high elasticity, the strength and the wear resistance of the non-woven fabric are improved.
Because the selected polyurethane is formed by polymerizing polyether and diisocyanate compounds and has the characteristic of water repellency, a continuous non-porous polyurethane film formed on the surface of the needled fiber net has good water repellency and can meet the requirement of the water repellency of the sisal nonwoven material. Meanwhile, the polyurethane film on the surface is firm due to the covalent bond action with the fiber net, and is not easy to fall off.
Because of the low melting point of the selected polyurethane powder, the temperature required in the hot rolling process is low, and the energy consumption is low. In addition, the polyurethane is biodegradable and has no pollution to the environment. The hot rolling setting temperature slightly higher than the melting point of polyurethane powder by 5-10 ℃ is adopted, and the polyurethane powder is used in a matched manner, so that the polyurethane powder on the surface layer of the non-woven fabric is fused and solidified to form a continuous water-repellent polyurethane film, and the structure is favorable for improving the strength of the non-woven material and increasing the wear resistance and water repellency of the non-woven material.
The hot rolling temperature is 85-105 ℃, the hot rolling speed is 40-50 m/min, the roller line pressure is 150-250N/cm, the powder scattering mass of polyurethane powder is 3-8% of the mass of the needled fiber web each time, and a layer of polyurethane water repellent film is respectively covered on the upper surface and the lower surface of the needled fiber web made of the sisal short fiber and viscose short fiber compound raw materials to form a three-layer structure non-woven material; the structure has the characteristics of uniform and good mechanical property and water repellency.
Has the advantages that:
the hot rolling temperature is 85-105 ℃, the hot rolling speed is 40-50 m/min, the linear pressure of a roller is 150-250N/cm, and the powder scattering mass of polyurethane powder is 3-8% of the mass of the needled fiber web each time; the hot-melt polyurethane powder scattered on the upper surface and the lower surface of the needled fiber web is melted and bonded with the sisal fibers and the viscose fibers, so that the strength and the wear resistance of the non-woven fabric are improved; after the polyurethane powder is melted, a water repellent film is formed on the surface of the needle-punched fiber net, which is beneficial to meeting the requirements of the non-woven material of the packaging bag. The density of the non-woven fabric surface is 90-120 g/m2The transverse breaking strength is 90-100N, the longitudinal breaking strength is 75-95N, the bursting strength is 70-90N, the wear-resisting index is 80-100 times/mg, and the water repellency gradeIs 3-4 grade. The selected polyurethane powder has the advantages of low melting point, low hot rolling temperature and low energy consumption. The raw materials used in the invention can be biodegraded, and have no pollution to the environment.
Detailed Description
The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
The performance index testing method comprises the following steps:
the method for testing the transverse breaking strength comprises the following steps: GB/T24218.3-2010;
the method for testing the longitudinal breaking strength comprises the following steps: GB/T24218.3-2010;
the method for testing bursting strength comprises the following steps: GB/T24218.5-2016;
the abrasion resistance index test method comprises the following steps: GB/T21196.1-2007, GB/T21196.2-2007, GB/T21196.3-2007 and GB/T21196.4-2007;
the water repellency test method comprises the following steps: GB/T14577 & lt 1993 & gt;
the testing method of the average diameter of the pore spaces of the needle punched fiber comprises the following steps: jin guanxiu, Yinwei, Rexin, Ming Fang, tou Cheng Yan, quantitative analysis of pore shape of spunbonded nonwovens [ J ]. textile bulletin, 2015,36(08):56-61.
Example 1
A preparation method of a water-repellent sisal non-woven fabric packaging bag material comprises the following specific steps:
(1) preparing a needle-punched fiber web:
(1.1) softening treatment:
(1.1.1) pretreating sisal hemp short fibers by adopting pretreatment liquid, wherein the pretreatment process parameters are as follows: the bath ratio is 1:10, the time is 120min, and the temperature is 110 ℃; wherein the pretreatment solution comprises the following components in percentage by weight: h2O2Concentration 4g/L, NaOH concentration 5g/L, Na2SO3Concentration 1.5g/L, Na5P3O10The concentration is 2.5 g/L;
(1.1.2) placing the pretreated sisal fibers into organic silicon softening agent treatment liquid with the concentration of 1% of organic silicon softening agent for chemical softening of the sisal fibers; the chemical softening process comprises the following steps: the temperature is 50 ℃, the time is 180min, and the bath ratio is 1: 10;
(1.1.3) finally kneading and extruding the sisal short fiber after the chemical softening to obtain the sisal short fiber after the softening treatment;
(1.2) compounding the sisal short fibers and the viscose short fibers after the softening treatment, and then preliminarily mixing and uniformly mixing to prepare sheet cotton type mixed fibers; when the materials are uniformly mixed, the speed of a fillet nail curtain of a cotton mixing machine is 45m/min, the speed of a horizontal curtain is 0.3m/min, the rotating speed of a cotton homogenizing roller is 582r/min, and the rotating speed of a cotton stripping roller is 412 r/min;
(1.3) carding the mixed fiber in the sheet cotton form, cross lapping, and performing random drafting with the draft multiple of 2.2 and needling to prepare a needled fiber web; wherein, the rotating speed of the licker-in the carding process is 600r/min, the rotating speed of the cylinder is 300r/min, the rotating speed of the doffer is 15r/min, and the speed of the working roll is 670 r/min; the needling density in the needling process is 100 needling/cm2The needling depth is 6mm, the needling frequency is 150 needling/min, and the number of needling channels is 2.
The average diameter of pores of the needle-punched fiber net of the prepared needle-punched fiber net is 125 mu m, and the mass percentage of sisal short fibers in the needle-punched fiber net is 50 percent; the transverse rupture strength of the needled web was 30N, the longitudinal rupture strength was 25N, the burst strength was 20N, and the abrasion resistance index was 15 times/mg.
(2) Uniformly scattering reactive polyurethane hot melt adhesive powder with the average particle size of 150 mu m and the melting point of 80 ℃ on the upper surface of a needled fiber web, performing hot rolling, turning over the needled fiber web, scattering reactive polyurethane hot melt adhesive powder on the other surface of the needled fiber web, and performing hot rolling at the hot rolling temperature of 85 ℃, the hot rolling speed of 40m/min and the roll line pressure of 250N/cm to obtain a water-repellent sisal non-woven fabric packaging bag material;
wherein, the powder mass of the reactive polyurethane hot melt adhesive powder is 3% of the mass of the needle-punched fiber web each time;
the prepared water-repellent sisal hempThe non-woven fabric packaging bag material is a three-layer structure formed by covering a layer of polyurethane water-repellent film on the upper surface and the lower surface of a needle-punched fiber web of a sisal short fiber and viscose short fiber compound raw material respectively; the polyurethane water repellent film and the needled fiber net are combined by chemical bonds; the surface density of the water-repellent sisal non-woven fabric packaging bag material is 90g/m2The transverse breaking strength is 90N, the longitudinal breaking strength is 75N, the bursting strength is 70N, the wear resistance index is 80 times/mg, and the water repellency grade is 3.
Example 2
A preparation method of a water-repellent sisal non-woven fabric packaging bag material comprises the following specific steps:
(1) preparing a needle-punched fiber web:
(1.1) softening treatment:
(1.1.1) pretreating sisal hemp short fibers by adopting pretreatment liquid, wherein the pretreatment process parameters are as follows: the bath ratio is 1:10, the time is 135min, and the temperature is 105 ℃; wherein the pretreatment solution comprises the following components in percentage by weight: h2O2Concentration 4g/L, NaOH concentration 7g/L, Na2SO3Concentration 2g/L, Na5P3O10The concentration is 3 g/L;
(1.1.2) putting the pretreated sisal fibers into organic silicon softening agent treatment liquid with the concentration of 1.3% of organic silicon softening agent for chemically softening the sisal fibers; the chemical softening process comprises the following steps: the temperature is 53 ℃, the time is 145min, and the bath ratio is 1: 12;
(1.1.3) finally kneading and extruding the sisal short fiber after the chemical softening to obtain the sisal short fiber after the softening treatment;
(1.2) compounding the sisal short fibers and the viscose short fibers after the softening treatment, and then preliminarily mixing and uniformly mixing to prepare sheet cotton type mixed fibers; when the cotton is uniformly mixed, the speed of a fillet nail curtain of a cotton mixing machine is 77m/min, the speed of a horizontal curtain is 0.6m/min, the rotating speed of a cotton homogenizing roller is 672r/min, and the rotating speed of a cotton stripping roller is 655 r/min;
(1.3) carding the mixed fiber in the sheet cotton form, cross lapping, and performing random drafting with the draft multiple of 2.4 and needling to prepare a needled fiber web; wherein, the rotating speed of the licker-in the carding process is 870r/min, the rotating speed of the cylinder is 350r/min, and the rotating speed of the dofferThe speed of the working roll is 22r/min and 860 r/min; the needling density in the needling process is 130 needling/cm2The needling depth is 6mm, the needling frequency is 250 needling/min, and the number of needling channels is 2.
The average diameter of pores of the needle-punched fiber web of the prepared needle-punched fiber web is 130 μm, and the mass percentage of sisal short fibers in the needle-punched fiber web is 45%; the needle-punched web had a transverse rupture strength of 30N, a longitudinal rupture strength of 27N, a burst strength of 23N, and a wear resistance index of 17 times/mg.
(2) Uniformly scattering reactive polyurethane hot melt adhesive powder with the average particle size of 186 mu m and the melting point of 80 ℃ on the upper surface of a needled fiber web, performing hot rolling, turning over the needled fiber web, scattering reactive polyurethane hot melt adhesive powder on the other surface of the needled fiber web, and performing hot rolling at the hot rolling temperature of 85 ℃, the hot rolling speed of 42m/min and the roll line pressure of 230N/cm to obtain a water-repellent sisal non-woven fabric packaging bag material;
wherein, the powder mass of the reactive polyurethane hot melt adhesive powder is 3% of the mass of the needle-punched fiber web each time;
the prepared water-repellent sisal non-woven fabric packaging bag material is of a three-layer structure that the upper surface and the lower surface of a needle-punched fiber web of a sisal short fiber and viscose short fiber compound raw material are respectively covered with a layer of polyurethane water-repellent film; the polyurethane water repellent film and the needled fiber net are combined by chemical bonds; the surface density of the water-repellent sisal non-woven fabric packaging bag material is 96g/m2The transverse breaking strength is 92N, the longitudinal breaking strength is 79N, the bursting strength is 73N, the abrasion resistance index is 83 times/mg, and the water repellency grade is 3.
Example 3
A preparation method of a water-repellent sisal non-woven fabric packaging bag material comprises the following specific steps:
(1) preparing a needle-punched fiber web:
(1.1) softening treatment:
(1.1.1) pretreating sisal hemp short fibers by adopting pretreatment liquid, wherein the pretreatment process parameters are as follows: the bath ratio is 1:10, the time is 130min, and the temperature is 100 ℃; wherein the pretreatment solution comprises the following components in percentage by weight: h2O2Concentration 5g/L, NaOH concentration 7g/L, Na2SO3Concentration 1.8g/L, Na5P3O10The concentration is 2.5 g/L;
(1.1.2) putting the pretreated sisal fibers into organic silicon softening agent treatment liquid with the concentration of 1.5% of organic silicon softening agent for chemically softening the sisal fibers; the chemical softening process comprises the following steps: the temperature is 50 ℃, the time is 128min, and the bath ratio is 1: 10;
(1.1.3) finally kneading and extruding the sisal short fiber after the chemical softening to obtain the sisal short fiber after the softening treatment;
(1.2) compounding the sisal short fibers and the viscose short fibers after the softening treatment, and then preliminarily mixing and uniformly mixing to prepare sheet cotton type mixed fibers; when the materials are uniformly mixed, the speed of a fillet nail curtain of a cotton mixing machine is 49m/min, the speed of a horizontal curtain is 0.5m/min, the rotating speed of a cotton homogenizing roller is 650r/min, and the rotating speed of a cotton stripping roller is 634 r/min;
(1.3) carding the mixed fiber in the sheet cotton form, cross lapping, and performing random drafting with the draft multiple of 2.5 and needling to prepare a needled fiber web; wherein, the rotating speed of the licker-in the carding process is 620r/min, the rotating speed of the cylinder is 400r/min, the rotating speed of the doffer is 17r/min, and the speed of the working roll is 740 r/min; the needling density in the needling process is 150 needling/cm2The needling depth is 7mm, the needling frequency is 280 needling/min, and the number of needling channels is 2.
The average diameter of pores of the needle-punched fiber web of the prepared needle-punched fiber web is 128 mu m, and the mass percentage of the sisal short fibers in the needle-punched fiber web is 45%; the needle-punched web had a transverse rupture strength of 35N, a longitudinal rupture strength of 29N, a burst strength of 26N, and an abrasion resistance index of 19 times/mg.
(2) Uniformly scattering reactive polyurethane hot melt adhesive powder with the average particle size of 173 mu m and the melting point of 80 ℃ on the upper surface of a needled fiber web, performing hot rolling, turning over the needled fiber web, scattering reactive polyurethane hot melt adhesive powder on the other surface of the needled fiber web, and performing hot rolling at the hot rolling temperature of 90 ℃, the hot rolling speed of 42m/min and the roll line pressure of 230N/cm to obtain a water-repellent sisal non-woven fabric packaging bag material;
wherein, the powder mass of the reactive polyurethane hot melt adhesive powder is 4% of the mass of the needle-punched fiber web each time;
the prepared water-repellent sisal non-woven fabric packaging bag material is of a three-layer structure that the upper surface and the lower surface of a needle-punched fiber web of a sisal short fiber and viscose short fiber compound raw material are respectively covered with a layer of polyurethane water-repellent film; the polyurethane water repellent film and the needled fiber net are combined by chemical bonds; the surface density of the water-repellent sisal non-woven fabric packaging bag material is 91g/m2The transverse breaking strength is 93N, the longitudinal breaking strength is 82N, the bursting strength is 76N, the abrasion resistance index is 85 times/mg, and the water repellency grade is 3.
Example 4
A preparation method of a water-repellent sisal non-woven fabric packaging bag material comprises the following specific steps:
(1) preparing a needle-punched fiber web:
(1.1) softening treatment:
(1.1.1) pretreating sisal hemp short fibers by adopting pretreatment liquid, wherein the pretreatment process parameters are as follows: the bath ratio is 1:10, the time is 130min, and the temperature is 105 ℃; wherein the pretreatment solution comprises the following components in percentage by weight: h2O2Concentration 4g/L, NaOH concentration 8g/L, Na2SO3Concentration 2.5g/L, Na5P3O10The concentration is 3 g/L;
(1.1.2) putting the pretreated sisal fibers into organic silicon softening agent treatment liquid with the concentration of 1.2% of organic silicon softening agent for chemically softening the sisal fibers; the chemical softening process comprises the following steps: the temperature is 55 ℃, the time is 137min, and the bath ratio is 1: 15;
(1.1.3) finally kneading and extruding the sisal short fiber after the chemical softening to obtain the sisal short fiber after the softening treatment;
(1.2) compounding the sisal short fibers and the viscose short fibers after the softening treatment, and then preliminarily mixing and uniformly mixing to prepare sheet cotton type mixed fibers; when the materials are uniformly mixed, the speed of a brad curtain of the cotton mixer is 48m/min, the speed of a horizontal curtain is 0.4m/min, the rotating speed of a cotton equalizing roller is 623r/min, and the rotating speed of a cotton stripping roller is 576 r/min;
(1.3) carding the mixed fiber in the sheet cotton form, cross lapping, and performing random drafting with the draft multiple of 2.4 and needling to prepare a needled fiber web; wherein the card is cardedIn the process, the rotating speed of the licker-in is 870r/min, the rotating speed of the cylinder is 490r/min, the rotating speed of the doffer is 21r/min, and the speed of the working roll is 700 r/min; the needling density in the needling process is 130 needling/cm2The needling depth is 6mm, the needling frequency is 230 needling/min, and the number of needling channels is 2.
The average diameter of pores of the needle-punched fiber web of the prepared needle-punched fiber web is 130 μm, and the mass percentage of sisal short fibers in the needle-punched fiber web is 40%; the needle-punched web had a transverse rupture strength of 35N, a longitudinal rupture strength of 30N, a burst strength of 29N, and an abrasion resistance index of 21 times/mg.
(2) Uniformly scattering reactive polyurethane hot melt adhesive powder with the average particle size of 197 microns and the melting point of 90 ℃ on the upper surface of a needled fiber web, performing hot rolling, turning over the needled fiber web, scattering reactive polyurethane hot melt adhesive powder on the other surface of the needled fiber web, and performing hot rolling at the hot rolling temperature of 95 ℃, the hot rolling speed of 45m/min and the roll line pressure of 210N/cm to obtain a water-repellent sisal non-woven fabric packaging bag material;
wherein, the powder mass of the reactive polyurethane hot melt adhesive powder is 5% of the mass of the needle-punched fiber web each time;
the prepared water-repellent sisal non-woven fabric packaging bag material is of a three-layer structure that the upper surface and the lower surface of a needle-punched fiber web of a sisal short fiber and viscose short fiber compound raw material are respectively covered with a layer of polyurethane water-repellent film; the polyurethane water repellent film and the needled fiber net are combined by chemical bonds; the surface density of the water-repellent sisal non-woven fabric packaging bag material is 110g/m2The transverse breaking strength is 95N, the longitudinal breaking strength is 85N, the bursting strength is 80N, the wear-resisting index is 87 times/mg, and the water repellency grade is 4.
Example 5
A preparation method of a water-repellent sisal non-woven fabric packaging bag material comprises the following specific steps:
(1) preparing a needle-punched fiber web:
(1.1) softening treatment:
(1.1.1) pretreating sisal hemp short fibers by adopting pretreatment liquid, wherein the pretreatment process parameters are as follows: the bath ratio is 1:15, the time is 135min, and the temperature is 100 ℃; wherein, the components and the content of the pretreatment liquid are as follows：H2O2The concentration is 6g/L, the NaOH concentration is 8g/L, Na2SO3Concentration 2.5g/L, Na5P3O10The concentration is 3 g/L;
(1.1.2) putting the pretreated sisal fibers into organic silicon softening agent treatment liquid with the concentration of 1.4% of organic silicon softening agent for chemically softening the sisal fibers; the chemical softening process comprises the following steps: the temperature is 50 ℃, the time is 154min, and the bath ratio is 1: 13;
(1.1.3) finally kneading and extruding the sisal short fiber after the chemical softening to obtain the sisal short fiber after the softening treatment;
(1.2) compounding the sisal short fibers and the viscose short fibers after the softening treatment, and then preliminarily mixing and uniformly mixing to prepare sheet cotton type mixed fibers; when the materials are uniformly mixed, the speed of a fillet nail curtain of a cotton mixing machine is 67m/min, the speed of a horizontal curtain is 0.3m/min, the rotating speed of a cotton homogenizing roller is 633r/min, and the rotating speed of a cotton stripping roller is 536 r/min;
(1.3) carding the mixed fiber in the sheet cotton form, cross lapping, and performing random drafting with the draft multiple of 2.6 and needling to prepare a needled fiber web; wherein, the rotating speed of the licker-in the carding process is 850r/min, the rotating speed of the cylinder is 430r/min, the rotating speed of the doffer is 15r/min, and the speed of the working roll is 680 r/min; the needling density in the needling process is 170 needling/cm2The needling depth is 8mm, the needling frequency is 180 needling/min, and the number of needling channels is 2.
The average diameter of pores of the needle-punched fiber web of the prepared needle-punched fiber web is 135 μm, and the mass percentage of sisal short fibers in the needle-punched fiber web is 35%; the transverse rupture strength of the needled web was 40N, the longitudinal rupture strength was 32N, the burst strength was 31N, and the abrasion resistance index was 24 times/mg.
(2) Uniformly scattering reactive polyurethane hot melt adhesive powder with the average particle size of 180 mu m and the melting point of 90 ℃ on the upper surface of a needled fiber web, performing hot rolling, turning over the needled fiber web, scattering reactive polyurethane hot melt adhesive powder on the other surface of the needled fiber web, and performing hot rolling at the hot rolling temperature of 95 ℃, the hot rolling speed of 47m/min and the roll line pressure of 190N/cm to obtain a water-repellent sisal non-woven fabric packaging bag material;
wherein, the powder mass of the reactive polyurethane hot melt adhesive powder is 5% of the mass of the needle-punched fiber web each time;
the prepared water-repellent sisal non-woven fabric packaging bag material is of a three-layer structure that the upper surface and the lower surface of a needle-punched fiber web of a sisal short fiber and viscose short fiber compound raw material are respectively covered with a layer of polyurethane water-repellent film; the polyurethane water repellent film and the needled fiber net are combined by chemical bonds; the surface density of the water-repellent sisal non-woven fabric packaging bag material is 115g/m2The transverse breaking strength is 96N, the longitudinal breaking strength is 88N, the bursting strength is 83N, the wear resistance index is 90 times/mg, and the water repellency grade is 4.
Example 6
A preparation method of a water-repellent sisal non-woven fabric packaging bag material comprises the following specific steps:
(1) preparing a needle-punched fiber web:
(1.1) softening treatment:
(1.1.1) pretreating sisal hemp short fibers by adopting pretreatment liquid, wherein the pretreatment process parameters are as follows: the bath ratio is 1:15, the time is 140min, and the temperature is 105 ℃; wherein the pretreatment solution comprises the following components in percentage by weight: h2O2Concentration 5g/L, NaOH concentration 6g/L, Na2SO3Concentration 2g/L, Na5P3O10The concentration is 3.2 g/L;
(1.1.2) putting the pretreated sisal fibers into organic silicon softening agent treatment liquid with the concentration of 1.4% of organic silicon softening agent for chemically softening the sisal fibers; the chemical softening process comprises the following steps: the temperature is 55 ℃, the time is 125min, and the bath ratio is 1: 15;
(1.1.3) finally kneading and extruding the sisal short fiber after the chemical softening to obtain the sisal short fiber after the softening treatment;
(1.2) compounding the sisal short fibers and the viscose short fibers after the softening treatment, and then preliminarily mixing and uniformly mixing to prepare sheet cotton type mixed fibers; when the materials are uniformly mixed, the speed of a fillet nail curtain of a cotton mixing machine is 47m/min, the speed of a horizontal curtain is 0.5m/min, the rotating speed of a cotton homogenizing roller is 680r/min, and the rotating speed of a cotton stripping roller is 457 r/min;
(1.3) carding and cross lapping the mixed fiber in the form of sheet cotton, wherein the draft multiple is 2.5Performing disorder drafting and needling to prepare a needled fiber web; wherein, the rotating speed of the licker-in the carding process is 620r/min, the rotating speed of the cylinder is 430r/min, the rotating speed of the doffer is 25r/min, and the speed of the working roll is 730 r/min; the needling density in the needling process is 190 spines/cm2The needling depth is 7mm, the needling frequency is 210 needling/min, and the number of needling channels is 2.
The average diameter of pores of the needle-punched fiber web of the prepared needle-punched fiber web is 140 μm, and the mass percentage of sisal short fibers in the needle-punched fiber web is 35%; the transverse rupture strength of the needled web was 45N, the longitudinal rupture strength was 35N, the burst strength was 32N, and the abrasion resistance index was 26 times/mg.
(2) Uniformly scattering reactive polyurethane hot melt adhesive powder with the average particle size of 235 microns and the melting point of 90 ℃ on the upper surface of a needled fiber web, performing hot rolling, turning over the needled fiber web, scattering reactive polyurethane hot melt adhesive powder on the other surface of the needled fiber web, and performing hot rolling at the hot rolling temperature of 100 ℃, the hot rolling speed of 47m/min and the roll line pressure of 170N/cm to obtain a water-repellent sisal non-woven fabric packaging bag material;
wherein, the powder mass of the reactive polyurethane hot melt adhesive powder is 6% of the mass of the needle-punched fiber web;
the prepared water-repellent sisal non-woven fabric packaging bag material is of a three-layer structure that the upper surface and the lower surface of a needle-punched fiber web of a sisal short fiber and viscose short fiber compound raw material are respectively covered with a layer of polyurethane water-repellent film; the polyurethane water repellent film and the needled fiber net are combined by chemical bonds; the surface density of the water-repellent sisal non-woven fabric packaging bag material is 116g/m2The transverse breaking strength is 97N, the longitudinal breaking strength is 91N, the bursting strength is 85N, the wear resistance index is 93 times/mg, and the water repellency grade is 4.
Example 7
A preparation method of a water-repellent sisal non-woven fabric packaging bag material comprises the following specific steps:
(1) preparing a needle-punched fiber web:
(1.1) softening treatment:
(1.1.1) pretreating sisal hemp short fibers by adopting pretreatment liquid, wherein the pretreatment process parameters are as follows: bath ratio of 1:15, time 145min, at the temperature of 110 ℃; wherein the pretreatment solution comprises the following components in percentage by weight: h2O2Concentration 6g/L, NaOH concentration 6g/L, Na2SO3Concentration 2g/L, Na5P3O10The concentration is 3 g/L;
(1.1.2) putting the pretreated sisal fibers into organic silicon softening agent treatment liquid with the concentration of 1.3% of organic silicon softening agent for chemically softening the sisal fibers; the chemical softening process comprises the following steps: the temperature is 53 ℃, the time is 151min, and the bath ratio is 1: 10;
(1.1.3) finally kneading and extruding the sisal short fiber after the chemical softening to obtain the sisal short fiber after the softening treatment;
(1.2) compounding the sisal short fibers and the viscose short fibers after the softening treatment, and then preliminarily mixing and uniformly mixing to prepare sheet cotton type mixed fibers; when the materials are uniformly mixed, the speed of a fillet nail curtain of a cotton mixing machine is 79m/min, the speed of a horizontal curtain is 0.6m/min, the rotating speed of a cotton homogenizing roller is 833r/min, and the rotating speed of a cotton stripping roller is 610 r/min;
(1.3) carding the mixed fiber in the sheet cotton form, cross lapping, and performing random drafting with the draft multiple of 2.2 and needling to prepare a needled fiber web; wherein, the rotating speed of the licker-in the carding process is 890r/min, the rotating speed of the cylinder is 450r/min, the rotating speed of the doffer is 18r/min, and the speed of the working roll is 930 r/min; the needling density in the needling process is 200 needling/cm2The needling depth is 7mm, the needling frequency is 170 needling/min, and the number of needling channels is 2.
The average diameter of pores of the needle-punched fiber web of the prepared needle-punched fiber web is 150 mu m, and the mass percentage of sisal short fibers in the needle-punched fiber web is 30 percent; the needle-punched web had a transverse rupture strength of 45N, a longitudinal rupture strength of 38N, a burst strength of 34N, and an abrasion resistance index of 28 times/mg.
(2) Uniformly scattering reactive polyurethane hot melt adhesive powder with the average particle size of 267 microns and the melting point of 100 ℃ on the upper surface of a needled fiber net, performing hot rolling, turning over the needled fiber net, scattering reactive polyurethane hot melt adhesive powder on the other surface of the needled fiber net, and performing hot rolling at the hot rolling temperature of 105 ℃, the hot rolling speed of 50m/min and the roll line pressure of 150N/cm to obtain a water-repellent sisal non-woven fabric packaging bag material;
wherein, the powder mass of the reactive polyurethane hot melt adhesive powder is 7% of the mass of the needle-punched fiber web each time;
the prepared water-repellent sisal non-woven fabric packaging bag material is of a three-layer structure that the upper surface and the lower surface of a needle-punched fiber web of a sisal short fiber and viscose short fiber compound raw material are respectively covered with a layer of polyurethane water-repellent film; the polyurethane water repellent film and the needled fiber net are combined by chemical bonds; the surface density of the water-repellent sisal non-woven fabric packaging bag material is 116g/m2The transverse breaking strength is 99N, the longitudinal breaking strength is 93N, the bursting strength is 87N, the wear resistance index is 96 times/mg, and the water repellency grade is 4.
Example 8
A preparation method of a water-repellent sisal non-woven fabric packaging bag material comprises the following specific steps:
(1) preparing a needle-punched fiber web:
(1.1) softening treatment:
(1.1.1) pretreating sisal hemp short fibers by adopting pretreatment liquid, wherein the pretreatment process parameters are as follows: the bath ratio is 1:15, the time is 150min, and the temperature is 110 ℃; wherein the pretreatment solution comprises the following components in percentage by weight: h2O2The concentration is 6g/L, the NaOH concentration is 8g/L, Na2SO3Concentration 2.5g/L, Na5P3O10The concentration is 3.5 g/L;
(1.1.2) putting the pretreated sisal fibers into organic silicon softening agent treatment liquid with the concentration of 1.5% of organic silicon softening agent for chemically softening the sisal fibers; the chemical softening process comprises the following steps: the temperature is 55 ℃, the time is 120min, and the bath ratio is 1: 15;
(1.1.3) finally kneading and extruding the sisal short fiber after the chemical softening to obtain the sisal short fiber after the softening treatment;
(1.2) compounding the sisal short fibers and the viscose short fibers after the softening treatment, and then preliminarily mixing and uniformly mixing to prepare sheet cotton type mixed fibers; when the materials are uniformly mixed, the speed of a fillet nail curtain of a cotton mixing machine is 80m/min, the speed of a horizontal curtain is 0.7m/min, the rotating speed of a cotton homogenizing roller is 882r/min, and the rotating speed of a cotton stripping roller is 686 r/min;
(1.3) sheet-to-sheetCarding the cotton-form mixed fibers, cross lapping, random drafting with the draft multiple of 2.6 and needling to prepare a needled fiber web; wherein, the rotating speed of the licker-in the carding process is 900r/min, the rotating speed of the cylinder is 500r/min, the rotating speed of the doffer is 40r/min, and the speed of the working roll is 960 r/min; the needling density in the needling process is 200 needling/cm2The needling depth is 8mm, the needling frequency is 350 needling/min, and the number of needling channels is 2.
The average diameter of pores of the needle-punched fiber web of the prepared needle-punched fiber web is 148 mu m, and the mass percentage of sisal short fibers in the needle-punched fiber web is 30%; the transverse rupture strength of the needled web was 50N, the longitudinal rupture strength was 40N, the burst strength was 35N, and the abrasion resistance index was 30 times/mg.
(2) Uniformly scattering reactive polyurethane hot melt adhesive powder with the average particle size of 300 mu m and the melting point of 100 ℃ on the upper surface of a needled fiber web, performing hot rolling, turning over the needled fiber web, scattering reactive polyurethane hot melt adhesive powder on the other surface of the needled fiber web, and performing hot rolling at the hot rolling temperature of 105 ℃, the hot rolling speed of 50m/min and the roll line pressure of 150N/cm to obtain a water-repellent sisal non-woven fabric packaging bag material;
wherein, the powder mass of the reactive polyurethane hot melt adhesive powder is 8% of the mass of the needle-punched fiber web each time;
the prepared water-repellent sisal non-woven fabric packaging bag material is of a three-layer structure that the upper surface and the lower surface of a needle-punched fiber web of a sisal short fiber and viscose short fiber compound raw material are respectively covered with a layer of polyurethane water-repellent film; the polyurethane water repellent film and the needled fiber net are combined by chemical bonds; the surface density of the water-repellent sisal non-woven fabric packaging bag material is 120g/m2The transverse breaking strength is 100N, the longitudinal breaking strength is 95N, the bursting strength is 90N, the wear resistance index is 100 times/mg, and the water repellency grade is 4.
Claims (10)
1. A preparation method of a water-repellent sisal non-woven fabric packaging bag material is characterized by comprising the following steps: firstly, preparing a needled fiber net by using sisal short fibers and viscose short fibers as raw materials, uniformly scattering polyurethane powder on the upper surface of the needled fiber net, carrying out hot rolling, turning over the needled fiber net, scattering polyurethane powder on the other surface of the needled fiber net, and carrying out hot rolling to obtain a water-repellent sisal non-woven fabric packaging bag material;
the average diameter of the pores of the needle-punched web is less than 150 μm;
the mass percentage of the sisal short fibers in the needle-punched fiber net is 30-50%;
the powder spraying mass of the polyurethane powder is 3-8% of the mass of the needled fiber web each time;
the hot rolling temperature is 85-105 ℃, the hot rolling speed is 40-50 m/min, and the roller line pressure is 150-250N/cm.
2. The preparation method of the water-repellent sisal nonwoven fabric packaging bag material according to claim 1, wherein the polyurethane powder is a reactive polyurethane hot melt adhesive, the average particle size is 150 μm-300 μm, and the melting point is 80-100 ℃.
3. The preparation method of the water-repellent sisal nonwoven fabric packaging bag material according to claim 1, wherein the transverse breaking strength of the needle-punched fiber web is 30-50N, the longitudinal breaking strength is 25-40N, the bursting strength is 20-35N, and the abrasion resistance index is 15-30 times/mg.
4. The preparation method of the water-repellent sisal nonwoven fabric packaging bag material according to claim 1, wherein the specific process flow of needling the fiber web is as follows:
(1) softening treatment: pretreating sisal hemp short fibers by adopting pretreatment liquid; placing the pretreated sisal fibers into organic silicon softener treatment liquid to chemically soften the sisal fibers; finally, kneading and extruding the sisal short fiber after chemical softening;
(2) compounding the sisal short fibers subjected to softening treatment with viscose short fibers, and then preliminarily mixing and uniformly mixing to prepare sheet cotton type mixed fibers;
(3) and carding, lapping, disorderly drafting and needling the banquet-cotton-type mixed fibers to prepare a needled fiber web.
5. The preparation method of the water-repellent sisal nonwoven fabric packaging bag material according to claim 4, wherein the pretreatment liquid comprises the following components in percentage by weight: h2O24-6 g/L concentration, 5-8 g/L concentration of NaOH, Na2SO3The concentration of Na is 1.5-2.5 g/L5P3O10The concentration is 2.5-3.5 g/L; the pretreatment process comprises the following steps: the bath ratio is 1: 10-15, the reaction time is 120-150 min, and the reaction temperature is 100-110 ℃;
the concentration of the organosilicon softener in the organosilicon softener treatment liquid is 1-1.5%; the chemical softening process comprises the following steps: the temperature is 50-55 ℃, the time is 120-180 min, and the bath ratio is 1: 10-15;
when the cotton is uniformly mixed, the speed of a fillet nail curtain of the cotton mixing machine is 45-80 m/min, the speed of a horizontal curtain is 0.3-0.7 m/min, the rotating speed of a cotton equalizing roller is 582-882 r/min, and the rotating speed of a cotton stripping roller is 412-686 r/min.
6. The preparation method of the water-repellent sisal nonwoven fabric packaging bag material according to claim 4, wherein the rotating speed of a licker-in roller in the carding process is 600-900 r/min, the rotating speed of a cylinder is 300-500 r/min, the rotating speed of a doffer is 15-40 r/min, and the speed of a working roller is 670-960 r/min.
7. The method for preparing the water-repellent sisal non-woven fabric packaging bag material according to claim 4, wherein the lapping mode is cross lapping;
the draft multiple in the messy draft process is 2.2-2.6;
the needling density in the needling process is 100-200 needling/cm2The needling depth is 6-8 mm, the needling frequency is 150-350 needling/min, and the number of needling channels is 2.
8. The water-repellent sisal non-woven fabric packaging bag material prepared by the method of any one of claims 1 to 7, is characterized in that the water-repellent sisal non-woven fabric packaging bag material is of a three-layer structure: namely, the upper surface and the lower surface of the needled fiber web of the sisal short fiber and viscose short fiber compound raw material are respectively covered with a layer of polyurethane water repellent film.
9. The water-repellent sisal nonwoven fabric packaging bag material of claim 8, wherein said polyurethane water-repellent film is chemically bonded to said needle-punched fiber web.
10. The water-repellent sisal nonwoven fabric packaging bag material of claim 8, wherein the surface density of the water-repellent sisal nonwoven fabric packaging bag material is 90-120 g/m2The transverse breaking strength is 90-100N, the longitudinal breaking strength is 75-95N, the bursting strength is 70-90N, the wear-resisting index is 80-100 times/mg, and the water repellency grade is 3-4.
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