CN114763634B - Flash spun sheet material - Google Patents

Flash spun sheet material Download PDF

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Publication number
CN114763634B
CN114763634B CN202110094668.7A CN202110094668A CN114763634B CN 114763634 B CN114763634 B CN 114763634B CN 202110094668 A CN202110094668 A CN 202110094668A CN 114763634 B CN114763634 B CN 114763634B
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sheet material
flash
lithopone
spinning
modifier
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CN114763634A (en
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叶孔萌
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Jiangsu Qingyun New Material Technology Co ltd
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Jiangsu Qingyun New Materials Co ltd
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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
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/005—Synthetic yarns or filaments
    • D04H3/007—Addition polymers
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
    • D01D5/00—Formation of filaments, threads, or the like
    • D01D5/11—Flash-spinning
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F1/00—General methods for the manufacture of artificial filaments or the like
    • D01F1/02—Addition of substances to the spinning solution or to the melt
    • D01F1/10—Other agents for modifying properties
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/44—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds
    • D01F6/46—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds of polyolefins
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
    • D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
    • D01F8/06—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyolefin as constituent
    • 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
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/10—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between yarns or filaments made mechanically

Abstract

The application relates to a flash spun sheet material having a tear index loss value DeltaX of 0.15 to 0.35; Δx=1-X2/X1; x1 is the tear index of the unaged sheet material; x2 is the tear index of the aged sheet material; the aging treatment process conditions are as follows: irradiance of 60 + -2 w/m in the wavelength range of 300-400 nm 2 The black standard temperature is 65+/-2 ℃, the air temperature of the test bin is 38+/-3 ℃, the relative humidity is 50+/-10%, and the drying time is 720 hours. The sheet material of the present application has a good antioxidant function.

Description

Flash spun sheet material
[ field of technology ]
The application relates to the technical field of flash spinning, in particular to a flash spun sheet material.
[ background Art ]
Flash spinning, also known as flash spinning, flash spinning or flash spinning, transient solvent evaporation to net, is not melt spinning but dry spinning. The high polymer is dissolved in a certain solvent to prepare spinning solution, and then the spinning solution is sprayed out from a spinneret orifice, and the high polymer is resolidified into fibers due to the rapid volatilization of the solvent. The dry spinning technology adopted by the flash evaporation method is different from the common dry spinning technology, and is mainly characterized in that the flash evaporation technology adopts lower spinning solution viscosity and ejects the spinning solution from a spinning hole at extremely high pressure and speed. Because of the low viscosity and good fluidity of the solution, the liquid filaments solidify in high speed movement to form very fine fiber filaments, which are finally adsorbed onto a web-forming curtain to form a web directly. Due to the excellent properties, the flash evaporation method polyethylene non-woven fabric is widely applied to packaging materials, protective clothing, covering cloth and printing base materials.
Chinese patent publication No. CN1207145C relates to a composite sheet, in particular a moisture vapor permeable, substantially liquid impermeable composite sheet comprising: a moisture vapor permeable monolithic polymer film having a first side and a second side, and a first nonwoven layer comprising a moisture vapor permeable powder adhesive bonded nonwoven layer, said powder adhesive bonded layer comprising a nonwoven fibrous web wherein greater than 95 weight percent of the fibers in the nonwoven web are compatible with said polymer film and the powder adhesive comprises a thermoplastic polymer that melts at the melting point temperature of the fibers and is compatible with the monolithic polymer film and at least 90 weight percent of the fiber components, said first nonwoven layer being bonded to the first side of the polymer film by extruding said film onto said first nonwoven layer.
Chinese patent publication No. CN1509356a relates to a lofty fibrous web, made by a process comprising the steps of: obtaining an unbonded, compacted fibrous batt wherein each fiber has a ribbon-like cross-section; and needling the fibrous batting to obtain a lofty fibrous web. The cloth has a thickness of at least 2m 2 Surface area per gram and at least 0.005mm/g/m 2 Is a thickness/basis weight ratio of (c). The cloth is particularly useful as a dry wipe for cleaning and dusting.
Chinese patent publication No. CN104603345a relates to a method for manufacturing a nonwoven barrier fabric, and a fabric obtainable according to said method, said fabric having a first side and a second opposite side, said method comprising the steps of: applying a primer composition to the first surface of the fabric by vapor or aerosol deposition to form a layer of primer composition, wherein the primer composition is substantially free of fluorinated compounds, and applying a barrier composition comprising at least one unsaturated fluorinated compound to the layer of primer composition by vapor or aerosol deposition to form at least one, and preferably one to four, more preferably two or three layers of barrier composition on the layer of primer composition.
When the sheet material prepared by the polyethylene flash evaporation method is used outdoors, the sheet material inevitably generates ageing phenomenon due to the common ultraviolet light and water vapor, and the ageing is accompanied with the fact that the tearing index of the sheet material is reduced, the application is a set of technical scheme designed for improving the 2 performance indexes of the sheet material, and experimental data prove that the sheet material has good technical effect and achieves the expected purpose.
[ application ]
The application aims to overcome the defects of the prior art and provides a flash-spun sheet material.
The aim of the application is realized by the following technical scheme:
a flash spun sheet material having a tear index loss value Δx of 0.15 to 0.35; the loss value of D65 fluorescence brightness of the sheet material is equal to or less than 0.10-0.40;
△X＝1-X2/X1；
x1 is the tear index of the unaged sheet material in mN.m 2 /g；
X2 is the tear index of the sheet material after aging treatment, unit mN.m 2 /g；
▲F＝1-F2/F1；
F1 is the D65 fluorescence brightness of the unaged sheet material;
f2 is the D65 fluorescence brightness of the sheet material after the aging treatment;
the aging treatment process conditions are as follows: irradiance of 60 + -2 w/m in the wavelength range of 300-400 nm 2 The black standard temperature is 65+/-2 ℃, the air temperature of the test bin is 38+/-3 ℃, the relative humidity is 50+/-10%, and the drying time is 720 hours.
The sheet material has a value of F2 greater than 0.65.
The sheet material has a value of F2 greater than 0.70.
The sheet material has a value of F2 greater than 0.75.
The sheet material has a value of F2 greater than 0.80.
The sheet material has a value of F2 greater than 0.85.
The sheet material has a value of F2 of less than 0.90.
The loss value DeltaX of the tear index of the sheet material is from 0.15 to 0.20.
The loss value DeltaX of the tear index of the sheet material is from 0.20 to 0.25.
The loss value DeltaX of the tear index of the sheet material is from 0.35 to 0.30.
The loss value DeltaX of the tear index of the sheet material is from 0.30 to 0.35.
The loss value of D65 fluorescence brightness of the sheet material is equal to or smaller than 0.10-0.20.
The loss value of D65 fluorescence brightness of the sheet material is equal to or smaller than 0.20-0.30
The loss value of D65 fluorescence brightness of the sheet material is equal to or smaller than 0.30-0.40.
A flash spun sheet material comprising polyethylene and a modifier as raw materials.
The modifier is a compound of lithopone and N, N' -bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine.
A method of preparing a flash spun sheet material comprising the steps of:
1. preparing spinning solution
The spinning solution comprises a polymer and a spinning solvent.
The mass fraction of the polymer in the spinning solution is 13-15%.
The polymer comprises polyethylene and a modifier.
The mass fraction of the modifier in the sheet material is 0.5-1.5%.
The spinning solvent is chloroform.
The preparation method of the modifier comprises the following specific steps:
adding lithopone into an aqueous solution of isopropanol, adding a magnesium chloride solution, adsorbing on the surface of the lithopone to generate magnesium hydroxide precipitate, filtering, drying, calcining to obtain lithopone with magnesium oxide coated on the surface, dispersing the lithopone with magnesium oxide coated on the surface into the aqueous solution of isopropanol of diphenyldiethoxysilane, adding vinyltrimethoxysilane, treating at 45-60 ℃ for 15-25 minutes, filtering, and vacuum drying filter residues to obtain surface modified lithopone; grinding and mixing the surface modified lithopone with N, N' -bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine to obtain the modifier.
The volume ratio of the isopropanol to the water in the aqueous solution of the isopropanol is 1:1;
the lithopone accounts for 2-8% of the water solution of the isopropanol;
the molar ratio of lithopone to magnesium chloride is 1:0.02-1:0.12;
the mass ratio of the lithopone coated with magnesium oxide to the diphenyl diethoxysilane is 1:1-1:2;
the mass ratio of the isopropanol to the diphenyl diethoxy silane is 1:0.06-1:0.26;
the mass ratio of the diphenyl diethoxy silane to the vinyl trimethoxy silicon is 1:1-1:1.2.
The mass ratio of the surface modified lithopone to the N, N' -bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine is 1:1-1:1.1.
The calcination process is characterized in that the rapid temperature rise rate is 20 ℃/min when the temperature is lower than 500 ℃, the slow temperature rise rate is 8 ℃/min when the temperature is 500-800 ℃.
The lithopone mainly plays a role in physical whitening as a common whitening agent, but is used as an inorganic material, has poor dispersibility in a matrix, affects the strength of the matrix and also causes the deterioration of whitening and extinction performance; at present, the conventional method mainly adopts a coupling agent to modify a brightening agent to improve the compatibility with a matrix, but the introduction of organic components, particularly silicon-containing materials, inevitably leads to the deterioration of brightening and extinction performance; n, N '-bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine is used as an antioxidant, and has a main antioxidant effect, and a chemical antioxidant effect is realized by using a group on a conjugated structure through a large conjugated structure in a molecule, but the N, N' -bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine is used as a low-molecular-weight organic molecule, so that the binding force with a matrix is weak, and the strong loss on the matrix is large. According to the application, diphenyl diethoxy silane is adopted as a coupling agent, and the influence of a silicon-containing material on the molecules of the whitening agent is eliminated in order to have certain binding force with a matrix, and meanwhile, magnesium ions with molecular chelation are introduced into the surface of the whitening agent in the preparation process of the inorganic whitening agent, so that the influence of the coupling agent on the whitening agent is eliminated; meanwhile, the benzene ring structure introduced into the whitening agent molecule can be used as a large conjugated structure to have affinity with N, N ' -bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine serving as an antioxidant, so that the problem of weak bonding force between N, N ' -bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine and a substrate is avoided, the influence of the introduction of the antioxidant on the strength of the substrate is ensured, and the introduction of the coupling agent containing the benzene ring structure is utilized, so that the N, N ' -bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine is the function of effectively reducing the self-oxidation reaction speed of a polyethylene sheet material and delaying aging degradation; the dual synergistic effects of whitening and antioxidation are exerted, and the damage to the matrix material caused by a single physical whitening agent or antioxidant is avoided.
2. Spinning process
And then carrying out flash spinning at the spinning temperature of 140-155 ℃ to obtain flash-spun fibers, and carrying out hot press molding by a roller at the hot press temperature of 105-115 ℃ to obtain the flash-spun sheet material.
The application also provides a technical scheme that:
a flash spun sheet composite material comprises polypropylene, polyethylene and a modifier.
The modifier is a compound of lithopone and N, N' -bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine.
The loss value of the D65 fluorescence brightness of the sheet composite material is 0.005-0.3.
The loss value DeltaX of the tear index of the sheet composite is 0.15 to 0.34.
A method of preparing a flash spun sheet composite comprising the steps of:
1. preparing spinning solution
The spinning solution comprises a polymer and a spinning solvent.
The mass fraction of the polymer in the spinning solution is 13-15%.
The polymer comprises polypropylene, polyethylene and a modifier.
The mass fraction of polypropylene in the sheet material is 1-3%.
The mass fraction of the modifier in the sheet material is 0.5-1.5%.
The spinning solvent is chloroform.
The preparation method of the modifier comprises the following specific steps: the method is the same as the above method.
2. Spinning process
And then carrying out flash spinning at the spinning temperature of 140-155 ℃ to obtain flash-spun fibers, and carrying out hot press molding by a roller at the hot press temperature of 105-115 ℃ to obtain the flash-spun sheet composite material.
The difference of the technical scheme is that a small amount of polypropylene is added into the raw materials, the tearing index of the sheet material of the final product is improved by utilizing the characteristic of the high strength of the polypropylene, and meanwhile, the addition of the polypropylene has small influence on the brightness of the sheet composite material.
Compared with the prior art, the application has the following positive effects:
the application has simple process and wide application.
The application has good brightness and controllable tearing index.
[ detailed description ] of the application
The following provides one embodiment of a flash spun sheet material of the present application.
Example 1
A method of preparing a flash spun sheet material comprising the steps of:
1. preparing spinning solution
The spinning solution comprises a polymer and a spinning solvent.
The mass fraction of the polymer in the spinning solution is 13%.
The polymer comprises polyethylene and a modifier.
The mass fraction of modifier in the sheet material was 0.5%.
The spinning solvent is chloroform.
The preparation method of the modifier comprises the following specific steps:
adding lithopone into an aqueous solution of isopropanol, adding a magnesium chloride solution, adsorbing on the surface of the lithopone to generate magnesium hydroxide precipitate, filtering, drying, calcining to obtain lithopone with magnesium oxide coated on the surface, dispersing the lithopone with magnesium oxide coated on the surface into the aqueous solution of isopropanol of diphenyldiethoxysilane, adding vinyltrimethoxysilane, treating at 45-60 ℃ for 15-25 minutes, filtering, and vacuum drying filter residues to obtain surface modified lithopone; grinding and mixing the surface modified lithopone with N, N' -bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine to obtain the modifier.
The volume ratio of the isopropanol to the water in the aqueous solution of the isopropanol is 1:1;
the mass fraction of lithopone in the aqueous solution of isopropanol is 2%;
the molar ratio of lithopone to magnesium chloride is 1:0.02;
the mass ratio of the lithopone coated with magnesium oxide to the diphenyl diethoxysilane is 1:1;
the mass ratio of the isopropanol to the diphenyl diethoxysilane is 1:0.06;
the mass ratio of diphenyldiethoxysilane to vinyltrimethoxysilane is 1:1.
The mass ratio of the surface modified lithopone to the N, N' -bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine is 1:1.
2. Spinning process
And then carrying out flash spinning at 140 ℃ to obtain flash-spun fibers, and carrying out hot press molding by a roller at 105 ℃ to obtain the flash-spun sheet material.
The aging treatment process conditions of the sample are as follows: irradiance of 60 + -2 w/m in the wavelength range of 300-400 nm 2 The black standard temperature is 65+/-2 ℃, the air temperature of the test bin is 38+/-3 ℃, the relative humidity is 50+/-10%, and the drying time is 720 hours.
The tearing index is tested by dividing the tearing degree of a sample by the ration, and the tearing index is the average value of the force required by the sample to tear to a certain length, see national standard GB/T455-2002. 10 samples are taken from the same sample, the sizes of the samples are 63 mm and 50 mm, wherein the width direction of 5 samples is parallel to the production processing direction of the samples, the width direction of the other 5 samples is perpendicular to the production processing direction of the samples, the tearing indexes of the two directions are calculated respectively, and then the tearing indexes are obtained by averaging.
Test of D65 fluorescence brightness referring specifically to measurement of GBT 7974-2013 blue diffuse reflection factor D65 brightness of paper, paperboard and pulp, test was performed according to the paper and paperboard method to measure D on the front side of the sample 65 Fluorescent brightness of F Positive direction The D65 fluorescence brightness of the back of the sample is measured to be F Back of body Again, this definition: d65 fluorescence brightness f= (F) of sample Positive direction +F Back of body )/2. D65 refers to fluorescence excited with a D65 light source, about ISO2470-1.
Test data of the samples were recorded according to the aging treatment and the test method described above, respectively, as shown in table 1.
Example 2
A method of preparing a flash spun sheet material comprising the steps of:
1. preparing spinning solution
The spinning solution comprises a polymer and a spinning solvent.
The mass fraction of the polymer in the spinning solution was 13.5%.
The polymer comprises polyethylene and a modifier.
The mass fraction of modifier in the sheet material was 0.7%.
The spinning solvent is chloroform.
The preparation method of the modifier comprises the following specific steps:
adding lithopone into an aqueous solution of isopropanol, adding a magnesium chloride solution, adsorbing on the surface of the lithopone to generate magnesium hydroxide precipitate, filtering, drying, calcining to obtain lithopone with magnesium oxide coated on the surface, dispersing the lithopone with magnesium oxide coated on the surface into the aqueous solution of isopropanol of diphenyldiethoxysilane, adding vinyltrimethoxysilane, treating at 45-60 ℃ for 15-25 minutes, filtering, and vacuum drying filter residues to obtain surface modified lithopone; grinding and mixing the surface modified lithopone with N, N' -bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine to obtain the modifier.
The volume ratio of the isopropanol to the water in the aqueous solution of the isopropanol is 1:1;
the mass fraction of lithopone in the aqueous solution of isopropanol is 4%;
the molar ratio of lithopone to magnesium chloride is 1:0.06;
the mass ratio of the lithopone coated with magnesium oxide to the diphenyl diethoxysilane is 1:1;
the mass ratio of the isopropanol to the diphenyl diethoxysilane is 1:0.1;
the mass ratio of diphenyldiethoxysilane to vinyltrimethoxysilane is 1:1.
The mass ratio of the surface modified lithopone to the N, N' -bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine is 1:1.
2. Spinning process
And then carrying out flash spinning at 145 ℃ to obtain flash-spun fibers, and carrying out hot press molding by a roller at 108 ℃ to obtain the flash-spun sheet material.
The aging treatment and the test method of this example were the same as those of example 1, and test data of the samples were recorded separately, as shown in Table 1.
Example 3
A method of preparing a flash spun sheet material comprising the steps of:
1. preparing spinning solution
The spinning solution comprises a polymer and a spinning solvent.
The mass fraction of the polymer in the spinning solution is 14%.
The polymer comprises polyethylene and a modifier.
The mass fraction of modifier in the sheet material was 1%.
The spinning solvent is chloroform.
The preparation method of the modifier comprises the following specific steps:
adding lithopone into an aqueous solution of isopropanol, adding a magnesium chloride solution, adsorbing on the surface of the lithopone to generate magnesium hydroxide precipitate, filtering, drying, calcining to obtain lithopone with magnesium oxide coated on the surface, dispersing the lithopone with magnesium oxide coated on the surface into the aqueous solution of isopropanol of diphenyldiethoxysilane, adding vinyltrimethoxysilane, treating at 45-60 ℃ for 15-25 minutes, filtering, and vacuum drying filter residues to obtain surface modified lithopone; grinding and mixing the surface modified lithopone with N, N' -bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine to obtain the modifier.
The volume ratio of the isopropanol to the water in the aqueous solution of the isopropanol is 1:1;
the lithopone has a mass fraction of 5% in an aqueous isopropanol solution;
the molar ratio of lithopone to magnesium chloride is 1:0.08;
the mass ratio of the lithopone coated with magnesium oxide to the diphenyl diethoxysilane is 1:1.5;
the mass ratio of the isopropanol to the diphenyl diethoxysilane is 1:0.16;
the mass ratio of diphenyldiethoxysilane to vinyltrimethoxysilane is 1:1.5.
The mass ratio of the surface modified lithopone to the N, N' -bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine is 1:1.05.
N, N' -bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine is a function capable of effectively reducing the auto-oxidation reaction speed and delaying aging degradation of polyethylene sheet materials.
2. Spinning process
And then carrying out flash spinning at the spinning temperature of 150 ℃ to obtain flash-spun fibers, and carrying out hot press molding by a roller at the hot press temperature of 111 ℃ to obtain the flash-spun sheet material.
The aging treatment and the test method of this example were the same as those of example 1, and test data of the samples were recorded separately, as shown in Table 1.
Example 4
A method of preparing a flash spun sheet material comprising the steps of:
1. preparing spinning solution
The spinning solution comprises a polymer and a spinning solvent.
The mass fraction of the polymer in the spinning solution was 14.5%.
The polymer comprises polyethylene and a modifier.
The mass fraction of modifier in the sheet material was 1.2%.
The spinning solvent is chloroform.
The preparation method of the modifier comprises the following specific steps:
adding lithopone into an aqueous solution of isopropanol, adding a magnesium chloride solution, adsorbing on the surface of the lithopone to generate magnesium hydroxide precipitate, filtering, drying, calcining to obtain lithopone with magnesium oxide coated on the surface, dispersing the lithopone with magnesium oxide coated on the surface into the aqueous solution of isopropanol of diphenyldiethoxysilane, adding vinyltrimethoxysilane, treating at 45-60 ℃ for 15-25 minutes, filtering, and vacuum drying filter residues to obtain surface modified lithopone; grinding and mixing the surface modified lithopone with N, N' -bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine to obtain the modifier.
The volume ratio of the isopropanol to the water in the aqueous solution of the isopropanol is 1:1;
the mass fraction of lithopone in the aqueous solution of isopropanol is 7%;
the molar ratio of lithopone to magnesium chloride is 1:0.1;
the mass ratio of the lithopone coated with magnesium oxide to the diphenyl diethoxysilane is 1:2;
the mass ratio of the isopropanol to the diphenyl diethoxysilane is 1:0.2;
the mass ratio of diphenyldiethoxysilane to vinyltrimethoxysilane is 1:1.2.
The mass ratio of the surface modified lithopone to the N, N' -bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine is 1:1.1.
N, N' -bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine is a function capable of effectively reducing the auto-oxidation reaction speed and delaying aging degradation of polyethylene sheet materials.
2. Spinning process
And then carrying out flash spinning at the spinning temperature of 150 ℃ to obtain flash-spun fibers, and carrying out hot press molding by a roller at the hot press temperature of 112 ℃ to obtain the flash-spun sheet material.
The aging treatment and the test method of this example were the same as those of example 1, and test data of the samples were recorded separately, as shown in Table 1.
Example 5
A method of preparing a flash spun sheet material comprising the steps of:
1. preparing spinning solution
The spinning solution comprises a polymer and a spinning solvent.
The mass fraction of the polymer in the spinning solution is 15%.
The polymer comprises polyethylene and a modifier.
The mass fraction of modifier in the sheet material was 1.5%.
The spinning solvent is chloroform.
The preparation method of the modifier comprises the following specific steps:
adding lithopone into an aqueous solution of isopropanol, adding a magnesium chloride solution, adsorbing on the surface of the lithopone to generate magnesium hydroxide precipitate, filtering, drying, calcining to obtain lithopone with magnesium oxide coated on the surface, dispersing the lithopone with magnesium oxide coated on the surface into the aqueous solution of isopropanol of diphenyldiethoxysilane, adding vinyltrimethoxysilane, treating at 45-60 ℃ for 15-25 minutes, filtering, and vacuum drying filter residues to obtain surface modified lithopone; grinding and mixing the surface modified lithopone with N, N' -bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine to obtain the modifier.
The volume ratio of the isopropanol to the water in the aqueous solution of the isopropanol is 1:1;
the mass fraction of lithopone in the aqueous solution of isopropanol is 8%;
the molar ratio of lithopone to magnesium chloride is 1:0.12;
the mass ratio of the lithopone coated with magnesium oxide to the diphenyl diethoxysilane is 1:2;
the mass ratio of the isopropanol to the diphenyl diethoxysilane is 1:0.26;
the mass ratio of diphenyldiethoxysilane to vinyltrimethoxysilane is 1:1.2.
The mass ratio of the surface modified lithopone to the N, N' -bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine is 1:1.1.
N, N' -bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine is a function capable of effectively reducing the auto-oxidation reaction speed and delaying aging degradation of polyethylene sheet materials.
2. Spinning process
And then carrying out flash spinning at 155 ℃ to obtain flash-spun fibers, and carrying out hot press molding by a roller at 115 ℃ to obtain the flash-spun sheet material.
The aging treatment and the test method of this example were the same as those of example 1, and test data of the samples were recorded separately, as shown in Table 1.
Comparative example 1
A method of preparing a flash spun sheet material comprising the steps of:
1. preparing spinning solution
The spinning solution comprises a polymer and a spinning solvent.
The mass fraction of the polymer in the spinning solution is 14%.
The polymer comprises polyethylene and a modifier.
The mass fraction of modifier in the sheet material was 1%.
The spinning solvent is chloroform.
The modifier is lithopone.
2. Spinning process
And then carrying out flash spinning at the spinning temperature of 150 ℃ to obtain flash-spun fibers, and carrying out hot press molding by a roller at the hot press temperature of 111 ℃ to obtain the flash-spun sheet material.
The aging treatment and the test method of this example were the same as those of example 1, and test data of the samples were recorded separately, as shown in Table 1.
Comparative example 2
A method of preparing a flash spun sheet material comprising the steps of:
1. preparing spinning solution
The spinning solution comprises a polymer and a spinning solvent.
The mass fraction of the polymer in the spinning solution is 14%.
The polymer comprises polyethylene and a modifier.
The mass fraction of modifier in the sheet material was 1%.
The spinning solvent is chloroform.
The modifier is N, N' -bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine.
2. Spinning process
And then carrying out flash spinning at the spinning temperature of 150 ℃ to obtain flash-spun fibers, and carrying out hot press molding by a roller at the hot press temperature of 111 ℃ to obtain the flash-spun sheet material.
The aging treatment and the test method of this example were the same as those of example 1, and test data of the samples were recorded separately, as shown in Table 1.
Comparative example 3
A method of preparing a flash spun sheet material comprising the steps of:
1. preparing spinning solution
The spinning solution comprises a polymer and a spinning solvent.
The mass fraction of the polymer in the spinning solution is 14%.
The polymer comprises polyethylene and a modifier.
The mass fraction of modifier in the sheet material was 1%.
The spinning solvent is chloroform.
The modifier is a mixture of lithopone and N, N' -bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine with a mass ratio of 1:1.05.
2. Spinning process
And then carrying out flash spinning at the spinning temperature of 150 ℃ to obtain flash-spun fibers, and carrying out hot press molding by a roller at the hot press temperature of 111 ℃ to obtain the flash-spun sheet material.
The aging treatment and the test method of this example were the same as those of example 1, and test data of the samples were recorded separately, as shown in Table 1.
TABLE 1
F2 D65 loss value of fluorescence brightness Loss value DeltaX of tear index
Example 1 0.66 0.274 0.338
Example 2 0.73 0.206 0.268
Example 3 0.78 0.161 0.241
Example 4 0.81 0.138 0.225
Example 5 0.85 0.105 0.187
Comparative example 1 0.76 0.431 0.389
Comparative example 2 0.72 0.412 0.402
Comparative example 3 0.74 0.426 0.395
Example 6
A flash spun sheet composite material comprises polypropylene, polyethylene and a modifier.
The modifier is a compound of lithopone and N, N' -bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine.
A method of preparing a flash spun sheet composite comprising the steps of:
1. preparing spinning solution
The spinning solution comprises a polymer and a spinning solvent.
The mass fraction of the polymer in the spinning solution is 13%.
The polymer comprises polypropylene, polyethylene and a modifier.
The mass fraction of polypropylene in the sheet material was 1%.
The mass fraction of modifier in the sheet material was 0.5%.
The spinning solvent is chloroform.
The preparation method of the modifier is the same as in example 1.
2. Spinning process
And then carrying out flash spinning at 140 ℃ to obtain flash-spun fibers, and carrying out hot press molding by a roller at 105 ℃ to obtain the flash-spun sheet composite material.
The aging treatment and the test method of this example were the same as those of example 1, and test data of the samples were recorded separately, as shown in Table 2.
Example 7
A flash spun sheet composite material comprises polypropylene, polyethylene and a modifier.
The modifier is a compound of lithopone and N, N' -bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine.
A method of preparing a flash spun sheet composite comprising the steps of:
1. preparing spinning solution
The spinning solution comprises a polymer and a spinning solvent.
The mass fraction of the polymer in the spinning solution is 14%.
The polymer comprises polypropylene, polyethylene and a modifier.
The mass fraction of polypropylene in the sheet material was 2%.
The mass fraction of modifier in the sheet material was 1%.
The spinning solvent is chloroform.
The preparation method of the modifier is the same as in example 3.
2. Spinning process
And then carrying out flash spinning at the spinning temperature of 150 ℃ to obtain flash-spun fibers, and carrying out hot press molding by a roller at the hot press temperature of 111 ℃ to obtain the flash-spun sheet composite material.
The aging treatment and the test method of this example were the same as those of example 1, and test data of the samples were recorded separately, as shown in Table 2.
Example 8
A flash spun sheet composite material comprises polypropylene, polyethylene and a modifier.
The modifier is a compound of lithopone and N, N' -bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine.
A method of preparing a flash spun sheet composite comprising the steps of:
1. preparing spinning solution
The spinning solution comprises a polymer and a spinning solvent.
The mass fraction of the polymer in the spinning solution is 15%.
The polymer comprises polypropylene, polyethylene and a modifier.
The mass fraction of polypropylene in the sheet material was 3%.
The mass fraction of modifier in the sheet material was 1.5%.
The spinning solvent is chloroform.
The preparation method of the modifier is the same as in example 5.
2. Spinning process
And then carrying out flash spinning at 155 ℃ to obtain flash-spun fibers, and carrying out hot press molding by a roller at 115 ℃ to obtain the flash-spun sheet composite material.
The aging treatment and the test method of this example were the same as those of example 1, and test data of the samples were recorded separately, as shown in Table 2.
Comparative example 4
A flash spun sheet composite material comprises polypropylene, polyethylene and a modifier.
The modifier is lithopone.
A method of preparing a flash spun sheet composite comprising the steps of:
1. preparing spinning solution
The spinning solution comprises a polymer and a spinning solvent.
The mass fraction of the polymer in the spinning solution is 14%.
The polymer comprises polypropylene, polyethylene and a modifier.
The mass fraction of polypropylene in the sheet material was 2%.
The mass fraction of modifier in the sheet material was 1%.
The spinning solvent is chloroform.
2. Spinning process
And then carrying out flash spinning at the spinning temperature of 150 ℃ to obtain flash-spun fibers, and carrying out hot press molding by a roller at the hot press temperature of 111 ℃ to obtain the flash-spun sheet composite material.
The aging treatment and the test method of this example were the same as those of example 1, and test data of the samples were recorded separately, as shown in Table 2.
Comparative example 5
A flash spun sheet composite material comprises polypropylene, polyethylene and a modifier.
The modifier is N, N' -bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine.
A method of preparing a flash spun sheet composite comprising the steps of:
1. preparing spinning solution
The spinning solution comprises a polymer and a spinning solvent.
The mass fraction of the polymer in the spinning solution is 14%.
The polymer comprises polypropylene, polyethylene and a modifier.
The mass fraction of polypropylene in the sheet material was 2%.
The mass fraction of modifier in the sheet material was 1%.
The spinning solvent is chloroform.
2. Spinning process
And then carrying out flash spinning at the spinning temperature of 150 ℃ to obtain flash-spun fibers, and carrying out hot press molding by a roller at the hot press temperature of 111 ℃ to obtain the flash-spun sheet composite material.
The aging treatment and the test method of this example were the same as those of example 1, and test data of the samples were recorded separately, as shown in Table 2.
Comparative example 6
A flash spun sheet composite material comprises polypropylene, polyethylene and a modifier.
The modifier is a mixture of lithopone and N, N' -bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine with a mass ratio of 1:1.05.
A method of preparing a flash spun sheet composite comprising the steps of:
1. preparing spinning solution
The spinning solution comprises a polymer and a spinning solvent.
The mass fraction of the polymer in the spinning solution is 14%.
The polymer comprises polypropylene, polyethylene and a modifier.
The mass fraction of polypropylene in the sheet material was 2%.
The mass fraction of modifier in the sheet material was 1%.
The spinning solvent is chloroform.
2. Spinning process
And then carrying out flash spinning at the spinning temperature of 150 ℃ to obtain flash-spun fibers, and carrying out hot press molding by a roller at the hot press temperature of 111 ℃ to obtain the flash-spun sheet composite material.
The aging treatment and the test method of this example were the same as those of example 1, and test data of the samples were recorded separately, as shown in Table 2.
TABLE 2
F2 D65 loss value of fluorescence brightness Loss value DeltaX of tear index
Example 6 0.65 0.259 0.318
Example 7 0.76 0.148 0.208
Example 8 0.83 0.009 0.161
Comparative example 4 0.63 0.308 0.357
Comparative example 5 0.72 0.313 0.379
Comparative example 6 0.80 0.337 0.412
The foregoing is merely a preferred embodiment of the present application, and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the concept of the present application, and are intended to be within the scope of the present application.

Claims (12)

1. A flash spun sheet material characterized in that the sheet material has a tear index loss value Δx of 0.15 to 0.35; the loss value of D65 fluorescence brightness of the sheet material is equal to or less than 0.10-0.40;
△X =1-X2/ X1；
x1 is the tear index in mNm of the unaged sheet material 2 /g；
X2 is the tear index of the sheet material after aging treatment, unit mNm 2 /g；
▲F=1-F2/F1；
F1 is the D65 fluorescence brightness of the unaged sheet material;
f2 is the D65 fluorescence brightness of the sheet material after the aging treatment;
the aging treatment process conditions are as follows: irradiance of 60+ -2 w/m in the wavelength range of 300-400 nm 2 The black standard temperature is 65+/-2 ℃, the air temperature of the test bin is 38+/-3 ℃, the relative humidity is 50+/-10%, and the drying time is 720 hours;
the flash-spun sheet material comprises polyethylene and a modifier as raw materials;
the preparation method of the modifier comprises the following specific steps:
adding lithopone into an aqueous solution of isopropanol, adding a magnesium chloride solution, adsorbing on the surface of the lithopone to generate magnesium hydroxide precipitate, filtering, drying, calcining to obtain lithopone with magnesium oxide coated on the surface, dispersing the lithopone with magnesium oxide coated on the surface into the aqueous solution of isopropanol of diphenyldiethoxysilane, adding vinyltrimethoxysilane, treating at 45-60 ℃ for 15-25 minutes, filtering, and vacuum drying filter residues to obtain surface modified lithopone; grinding and mixing the surface modified lithopone with N, N' -bis- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl) hexamethylenediamine to obtain the modifier.
2. A flash spun sheet material as defined in claim 1 wherein the sheet material has a F2 value greater than 0.65.
3. A flash spun sheet material as defined in claim 1 wherein the sheet material has a F2 value greater than 0.70.
4. A flash spun sheet material as defined in claim 1 wherein the sheet material has a F2 value greater than 0.75.
5. A flash spun sheet material as defined in claim 1 wherein the sheet material has a F2 value greater than 0.80.
6. A flash spun sheet material as defined in claim 1 wherein the sheet material has a F2 value greater than 0.85.
7. A flash spun sheet material as defined in claim 1 wherein the sheet material has a F2 value of less than 0.90.
8. A flash spun sheet material according to claim 1, wherein the loss value Δx of the tear index of the sheet material is between 0.15 and 0.20.
9. A flash spun sheet material according to claim 1, wherein the loss value Δx of the tear index of the sheet material is between 0.20 and 0.25.
10. A flash spun sheet material according to claim 1, wherein the loss value Δx of the tear index of the sheet material is between 0.30 and 0.35.
11. A flash spun sheet material of claim 1 wherein the sheet material has a D65 fluorescent brightness loss value of 0.20 to 0.30.
12. A flash spun sheet material as claimed in claim 1 wherein the mass fraction of modifier in the sheet material is from 0.5 to 1.5%.
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