CN114892443A - High-strength high-permeability interlaminar toughened synthetic fiber paper base material and preparation method and application thereof - Google Patents

High-strength high-permeability interlaminar toughened synthetic fiber paper base material and preparation method and application thereof Download PDF

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Publication number
CN114892443A
CN114892443A CN202210482628.4A CN202210482628A CN114892443A CN 114892443 A CN114892443 A CN 114892443A CN 202210482628 A CN202210482628 A CN 202210482628A CN 114892443 A CN114892443 A CN 114892443A
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fibers
interlaminar
permeability
synthetic fiber
strength
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龙金
胡健
张雪姣
李尧
李西
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South China University of Technology SCUT
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South China University of Technology SCUT
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/10—Organic non-cellulose fibres
    • D21H13/12—Organic non-cellulose fibres from macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H13/14—Polyalkenes, e.g. polystyrene polyethylene
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/10—Organic non-cellulose fibres
    • D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H13/24—Polyesters
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/10—Organic non-cellulose fibres
    • D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H13/26—Polyamides; Polyimides
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/36—Inorganic fibres or flakes
    • D21H13/46—Non-siliceous fibres, e.g. from metal oxides
    • D21H13/50—Carbon fibres
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/06—Paper forming aids
    • D21H21/08—Dispersing agents for fibres
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/06—Paper forming aids
    • D21H21/12—Defoamers
    • 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
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/64—Paper recycling

Abstract

The invention provides a high-strength high-permeability interlaminar toughened synthetic fiber paper base material and a preparation method and application thereof. The preparation method comprises the following steps: s1, adding matrix synthetic fibers and reinforcing fibers into water, then adding a dispersing agent for defibering, and obtaining mixed defibered fibers after defibering; s2, adding a defoaming agent into the mixed defibering fibers obtained in the step S1, defoaming, draining water to form paper, drying and hot-pressing to obtain the high-strength high-permeability interlaminar toughening synthetic fiber paper base material. According to the invention, through the synergistic effect between the specific dispersant and the defoamer, the prepared paper-based material is uniformly distributed and does not generate pinholes; and the mechanical property of the paper-based material is further improved by adding the reinforcing fibers and the synthetic fibers of the matrix for blending.

Description

High-strength high-permeability interlaminar toughened synthetic fiber paper base material and preparation method and application thereof
Technical Field
The invention belongs to the technical field of composite materials, and particularly relates to a high-strength and high-permeability interlaminar toughened synthetic fiber paper-based material, and a preparation method and application thereof.
Background
Interlaminar toughening is usually inserted between the pavers of the composite laminated plate in the form of particles, films, nano materials and the like, a toughening structure is formed between the pavers, and further energy dissipation in the crack propagation process is increased, so that the aim of improving the interlaminar fracture toughness of the composite is fulfilled, and the method is a feasible method for improving the impact resistance of the composite laminated plate.
The toughening method mainly comprises the following steps of using prepreg as a raw material to form a composite material and using a liquid-state composite material: 1) the prepreg is used as a raw material for forming the composite material, and a composite material part with qualified quality can be obtained only by ensuring that the resin matrix permeates into gaps of the single-layer reinforced fibers, so that the resin matrix can be modified by adding the thermoplastic toughening material, and the forming quality of the composite material cannot be influenced even if the viscosity of the resin matrix is higher; 2) whereas liquid molding of composite materials requires the resin matrix to completely penetrate the entire reinforcement fiber preform, this requires a very low viscosity of the resin matrix: the resin matrix viscosity was less than 0.5Pas during the process window. This results in the solution of toughening and modifying the resin matrix with a thermoplastic resin not being suitable for liquid molding of composite materials. Therefore, the interlaminar toughening technology becomes a necessary way for improving the interlaminar toughness of the liquid molding composite material.
Foreign research shows that a small amount of short fibers are introduced between layers of a composite material in the process of laying a traditional laminated board, so that a short fiber toughening structure which is randomly distributed is formed between the layers. The bridging of the short fibers can produce a significant toughening effect when the cracks propagate. The toughening method of the interlayer short fiber is effective, simple to operate and has little influence on other properties of the composite material. The use of wet-forming processes is one of the most effective ways to make the chopped synthetic fibers into a thin layer of material. The wet forming is a process for preparing a paper base material by filtering fibers dispersed in liquid through a filter screen, the synthetic fiber paper base material prepared by the process is called as a wet non-woven fabric, the fibers in the wet non-woven fabric are randomly arranged and almost isotropic, the three-dimensional random uniform distribution of the fibers can be realized, and the matching of the fibers in any type and proportion can be realized. Because of the distribution characteristic and good permeability of the material fiber, the liquid molding composite material interlayer toughness can be improved, meanwhile, the influence of the non-woven fabric on the liquid molding process is small, the flowing and the permeation of the resin matrix in the pre-molding body can not be hindered, and the good process performance is kept.
The synthetic fiber used for papermaking has hydrophobicity, and is easy to float on the upper part of the liquid layer to form a floccule; meanwhile, a large amount of foam exists in the synthetic fiber suspension, the foam exists for a long time and is not easy to eliminate, so that the synthetic fiber has extremely poor dispersion performance, the uniformity of formed paper is poor, the phenomena of pinholes and fiber flocculation exist, and the uniform thickness of the paper made by the paper making machine is difficult to ensure. Therefore, it is difficult to obtain a uniformly dispersed fiber suspension by selecting a proper dispersant and defoamer system. The synthetic fiber has no bonding force, and the key point is to select the reinforcing fiber and the reinforcing technology to improve the strength of the fiber paper and ensure the uniform forming of the fiber paper.
Disclosure of Invention
The invention provides a preparation method of a high-strength high-permeability interlaminar toughening synthetic fiber paper base material, aiming at overcoming the defects of poor dispersibility, difficult foam dissipation and poor strength of prepared fiber paper in the paper making process of synthetic fibers in the prior art.
The invention also aims to provide the high-strength and high-permeability interlaminar toughened synthetic fiber paper base material prepared by the preparation method.
The invention also aims to provide application of the high-strength and high-permeability interlaminar toughened synthetic fiber paper-based material in the technical field of interlaminar toughening in liquid forming.
In order to solve the technical problems, the invention adopts the following technical scheme:
a preparation method of a high-strength and high-permeability interlaminar toughened synthetic fiber paper-based material is characterized by comprising the following steps:
s1, defibering: adding the matrix synthetic fiber and the reinforcing fiber into water, then adding a dispersing agent for defibering, and obtaining mixed defibered fiber after defibering;
s2, forming of a paper-based material: adding a defoaming agent into the mixed defibering fibers obtained in the step S1, filtering water to form paper after defoaming, drying and hot-pressing to obtain a high-strength high-permeability interlaminar toughened synthetic fiber paper base material;
wherein, in the step S2, the dispersant is one or a combination of a plurality of nonionic dispersants, anionic dispersants or water-soluble polymer dispersants;
s1, the reinforced fibers are one or a combination of two-component nylon fibers, two-component polyethylene terephthalate fibers (two-component PET fibers) or ES fibers;
and S2, the defoaming agent is one or a combination of more of a higher alcohol defoaming agent, an organic silicon defoaming agent or a polyether defoaming agent.
The inventor of the invention selects proper dispersant, defoamer and reinforcing fiber to ensure that the prepared paper base material is even in ventilation and has more excellent mechanical property under less quantitative conditions, the tensile strength of the paper base material is above 175N/m and can be as high as 263N/m, and the elongation at break is more than 7 percent and can be as high as 8.7 percent.
The selected dispersing agent can enable the surface of the fiber to form a bilayer structure, the polar end of the outer dispersing agent has strong affinity with water, the degree of wetting the fiber by water is increased, the inner layer can be well lapped with the fiber, the inner layer can be well enriched on the surfaces of the matrix synthetic fiber and the reinforced fiber, the surface tension of the surface of the fiber is reduced, the fiber is uniformly dispersed in water, and stable suspension can be formed; although the use of the dispersant improves the dispersibility of the fibers in water, the reduction in the surface tension of the fibers tends to slow the rate of foam generation during the papermaking process, so that the generated foam is more stably present in the fiber slurry. The inventor screens out a proper defoaming agent through a large number of experiments, and the defoaming agent can act together with a dispersing agent and reduce the strength of the film surface of formed foam so that the foam can be broken quickly after being generated. Therefore, in the invention, the synergistic action between the specific dispersing agent and the defoaming agent reduces the amount of generated foam by reducing the generation rate of the foam on one hand, and rapidly breaks and eliminates the foam by reducing the film surface strength of the foam on the other hand, so that fibers are uniformly dispersed, and the prepared paper base material is uniformly distributed and has no pinholes.
In addition, the reinforced fibers and the matrix synthetic fibers are added and blended, so that the reinforced fibers have good compatibility with the matrix synthetic fibers, can be uniformly dispersed in the matrix synthetic fibers, and further improve the mechanical property of the paper-based material.
Optionally, the matrix synthetic fiber includes, but is not limited to, one or a combination of nylon fiber, polyethylene terephthalate, aramid fiber, carbon fiber, or aramid pulp.
Optionally, the nonionic dispersant is one or a combination of several of polyoxyethylene ether methylsilane, polyoxyethylene oleate, polyethylene glycol p-isooctyl phenyl ether or polyethylene oxide.
Optionally, the anionic dispersant is one or a combination of more of fatty alcohol-polyoxyethylene ether sodium sulfate, sodium dodecyl sulfate, Turkey red oil, cellulose sodium sulfate, sodium alkyl diphenyl ether sulfonate or alkylphenol polyoxyethylene ether phosphate.
Optionally, the water-soluble polymeric dispersant is polyethylene oxide and/or polyacrylamide.
In order to further improve the dispersibility of the fiber in water, preferably, the dispersant is one or a combination of several of polyoxyethylene ether methyl silane, polyethylene glycol p-isooctyl phenyl ether, sodium dodecyl sulfate, sodium alkyl diphenyl ether sulfonate, polyethylene oxide or polyacrylamide.
Preferably, the addition amount of the dispersing agent is 0.2-1% of the weight of the mixed defibering fiber. The addition amount of the dispersing agent is too small, and the dispersibility of the fiber is poor; too much dispersant can increase the amount of foam generated in the fiber slurry to some extent, so that a proper dispersant addition can ensure both better fiber dispersion and less foam generation.
More preferably, the addition amount of the dispersing agent is 0.3-0.8% of the weight of the mixed defibering fiber; still more preferably 0.5%.
The higher alcohol defoaming agent is an alcohol defoaming agent with 12-22 carbon atoms.
Optionally, the higher alcohol antifoaming agent is sec-octanol and/or n-butanol.
Optionally, the silicone defoaming agent is one or a combination of polydimethylsiloxane and derivatives thereof.
Optionally, the polyether defoamer is one or a combination of several of fatty alcohol-polyoxyethylene ether, alkylphenol polyoxyethylene ether, polyoxyethylene fatty acid ester or polyoxyethylene fatty amine.
In order to further eliminate the foam rapidly, preferably, the defoaming agent is one or a combination of several of fatty alcohol-polyoxyethylene ether, alkylphenol polyoxyethylene ether, polydimethylsiloxane, sec-octanol or n-butanol.
Preferably, the addition amount of the defoaming agent is 0.1-5% of the weight of the mixed defibering fiber. Like the dispersant, the addition amount of the defoamer is too small, and the existence time of foam is longer; the amount of the defoaming agent added is too large, and the amount of foam generated is also easily increased. Suitable amounts of antifoam added can eliminate foam significantly rapidly.
More preferably, the addition amount of the defoaming agent is 1.5-3.5% of the weight of the mixed defibering fiber; still more preferably 3%.
It should be noted that the bicomponent in the "bicomponent nylon fiber, bicomponent polyethylene terephthalate fiber" mentioned in the reinforcing fiber of the present invention specifically refers to a fiber of a sheath-core structure, in which the core component is completely surrounded by another component (sheath), the cross-sectional shapes and areas of the two components are different, the melting temperature of the sheath is generally lower than that of the core layer, and the sheath plays a role in adhesion.
In order to further improve the mechanical properties of the prepared paper-based material, preferably, the reinforcing fibers are bicomponent nylon fibers and/or bicomponent PET fibers.
Preferably, the melting point of the nylon as the core component of the bi-component nylon fiber is 410-500 ℃, and the melting point of the nylon as the sheath component is 130-150 ℃.
Preferably, the melting point of the core component PET of the bicomponent PET fiber is 250-280 ℃, and the melting point of the sheath component PET is 100-120 ℃.
Preferably, in the mixed defibering fibers, the weight ratio of the matrix synthetic fibers to the reinforcing fibers is 1-19: 1.
Further preferably, the weight ratio of the matrix synthetic fibers to the reinforcing fibers is 1-9: 1; still more preferably 2: 1.
Preferably, the length of the matrix synthetic fibers and/or the reinforcing fibers is 1-15 mm.
Preferably, the fineness of the mixed defibering fiber in the step S1 is 0.5-5 dtex.
Preferably, the drying temperature in the step S2 is 70-150 ℃.
Preferably, the temperature of the hot pressing in the step S2 is 90-150 ℃.
Preferably, the pressure of the hot pressing in the step S2 is 0.5-1 MPa.
Preferably, the hot pressing time in the step S2 is 1-5 s.
A high-strength high-permeability interlaminar toughened synthetic fiber paper base material is prepared by the preparation method.
Preferably, the basis weight of the high-strength and high-permeability interlaminar toughened synthetic fiber paper base material is 8-15 g/m 2 。
Preferably, the air permeability of the high-strength and high-permeability interlayer toughened synthetic fiber paper-based material is 1700-3500L/m 2 .s(@200Pa)。
The application of the high-strength and high-permeability interlaminar toughened synthetic fiber paper-based material in the technical field of liquid forming interlaminar toughening is also within the protection scope of the invention.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, through the synergistic effect between the specific dispersant and the defoamer, the prepared paper-based material is uniformly distributed and does not generate pinholes; and the mechanical property of the paper-based material is further improved by adding the reinforcing fibers and the synthetic fibers of the matrix for blending. The paper base material prepared by the method has proper and uniform air permeability and good paper uniformity, and can be quantitatively measured at a small quantity (8-15 g/m) 2 ) Has more excellent mechanical properties under the condition that the tensile strength of the paper base material is more than 175N/m and can reach 263N/m, and the elongation at break>7%, up to 8.7%.
Detailed Description
The present invention is further illustrated by the following specific examples, which are not intended to limit the invention in any way. The reagents, methods and apparatus employed in the present invention are conventional in the art, except as otherwise indicated.
Wherein, the reinforcing fiber:
the bicomponent nylon fiber is purchased from Tekken, Japan, and has a melting point of 410-500 ℃ for the core component nylon and 130-150 ℃ for the sheath component nylon;
the bicomponent PET fiber is purchased from Dijiu Japan, and the melting point of the core component PET of the bicomponent PET fiber is 250-280 ℃, and the melting point of the sheath component PET is 100-120 ℃;
ES fibers, purchased from Korea, Japan;
PVA fibers, purchased from Toray Japan.
Unless otherwise indicated, reagents and materials used in the present invention are commercially available.
Example 1
The embodiment provides a high-strength and high-permeability interlaminar toughened synthetic fiber paper-based material, which is prepared by the following steps:
s1, defibering: adding 0.400g of monocomponent nylon fiber with the fiber length of 6mm and 0.400g of bicomponent nylon fiber with the fiber length of 9mm into water, then adding 0.004g of polyoxyethylene ether methyl silane (dispersing agent) for defibering, and obtaining mixed defibering fiber suspension after defibering;
s2, forming of a paper base material: and (3) adding 0.024g of fatty alcohol-polyoxyethylene ether (defoaming agent) into the mixed defibering fiber suspension obtained in the step (S1), removing bubbles, draining water to form paper, drying at 140 ℃ until the weight is not changed, and hot-pressing the dried paper-based material for 2S at the conditions of 0.5MPa and 140 ℃ to obtain the high-strength high-permeability interlaminar toughened synthetic fiber paper-based material.
Example 2
The embodiment provides a high-strength and high-permeability interlaminar toughened synthetic fiber paper-based material, which is prepared by the following steps:
s1, defibering: adding 0.6g of monocomponent nylon fiber with the fiber length of 6mm and 0.6g of bicomponent PET fiber with the fiber length of 9mm into water, then adding 0.0096g of polyacrylamide (dispersing agent) for defibering, and obtaining mixed defibering fiber suspension after defibering;
s2, forming of a paper-based material: adding 0.0372g of alkylphenol polyoxyethylene ether (defoaming agent) into the mixed defibering fiber suspension obtained in the step S1, filtering to form paper after defoaming, drying at the temperature of 110 ℃ until the weight is not changed, and then carrying out hot pressing on the dried paper base material for 2S under the conditions of 0.5MPa and 110 ℃ to obtain the high-strength high-permeability interlaminar toughened synthetic fiber paper base material.
Example 3
The embodiment provides a high-strength and high-permeability interlaminar toughened synthetic fiber paper-based material, which is prepared by the following steps:
s1, defibering: adding 0.72g of single-component PET fiber with the fiber length of 9mm and 0.48g of ES fiber with the fiber length of 6mm into water, then adding 0.0072g of polyoxyethylene (dispersing agent) for defibering, and obtaining mixed defibered fiber suspension after defibering;
s2, forming of a paper-based material: and (3) adding 0.042g of polydimethylsiloxane (defoaming agent) into the mixed defibering fiber suspension obtained in the step (S1), filtering to form paper after defoaming, drying at the temperature of 140 ℃ until the weight is not changed, and then carrying out hot pressing on the dried paper base material for 2S under the conditions of 1MPa and 140 ℃ to obtain the high-strength and high-permeability interlaminar toughened synthetic fiber paper base material.
Example 4
The embodiment provides a high-strength and high-permeability interlaminar toughened synthetic fiber paper-based material, which is prepared by the following steps:
s1, defibering: 1.05g of monocomponent nylon fiber with the fiber length of 12mm and 0.45g of bicomponent nylon fiber with the fiber length of 9mm are added into water, then 0.007g of sodium dodecyl sulfate (dispersant) is added for defibering, and mixed defibering fiber suspension is obtained after defibering;
s2, forming of a paper-based material: and (3) adding 0.03g of sec-octanol (a defoaming agent) into the mixed defibering fiber suspension obtained in the step (S1), filtering to form paper after defoaming, drying at 140 ℃ until the weight is not changed, and then carrying out hot pressing on the dried paper base material for 2S under the conditions of 0.5MPa and 140 ℃ to obtain the high-strength and high-permeability interlaminar toughening synthetic fiber paper base material.
Example 5
The embodiment provides a high-strength and high-permeability interlaminar toughened synthetic fiber paper-based material, which is prepared by the following steps:
s1, defibering: 1.35g of monocomponent nylon fiber with the fiber length of 15mm and 0.15ES fiber with the fiber length of 8mm are added into water, then 0.007g of polyethylene glycol is added to carry out defibering on isooctyl phenyl ether (dispersant), and mixed defibered fiber suspension is obtained after defibering;
s2, forming of a paper-based material: and (3) adding 0.045g of n-butyl alcohol (defoaming agent) into the mixed defibering fiber suspension obtained in the step (S1), filtering to form paper after defoaming, drying at 140 ℃ until the weight is not changed, and then carrying out hot pressing on the dried paper base material for 2S under the conditions of 0.5MPa and 140 ℃ to obtain the high-strength and high-permeability interlaminar toughening synthetic fiber paper base material.
Comparative example 1
The present comparative example provides an interlayer toughened synthetic fiber paper-based material, the preparation method of which differs from example 1 in that the dispersant in step s2 is replaced with sodium hexametaphosphate.
Comparative example 2
The present comparative example provides an interlayer toughened synthetic fiber paper-based material, the difference of which from example 1 is that the defoamer in step s2 is replaced with diesel.
Comparative example 3
The present comparative example provides an interlaminar toughened synthetic fiber paper-based material, the method of preparation of which differs from example 1 in that the reinforcing fibers in step s1 are replaced with PVA fibers.
Comparative example 4
The present comparative example provides an interlayer toughened synthetic fiber paper-based material, the difference of which from example 1 is that no dispersant is added in step s2.
Comparative example 5
The present comparative example provides an interlayer toughened synthetic fiber paper-based material, the difference of which from example 1 is that no defoamer is added in step s2.
Comparative example 6
This comparative example provides an interlaminated toughened synthetic fiber paper base material which was prepared by a method different from that of example 1 in that the reinforcing fibers in step s1. were replaced with matrix synthetic fibers (i.e., no reinforcing fibers were added).
Performance testing
The performance of the interlaminar toughened synthetic fiber paper base material prepared in the above examples and comparative examples was tested, and the specific test items and test methods were as follows:
1. quantification: the determination is carried out according to the method of GB/T451.2-2002;
2. thickness: the determination is carried out according to the method of GB T451.3-2002;
3. air permeability: the determination is carried out according to the method of GB T458-2008;
4. tensile strength: the tensile strength of the paper and the paperboard is measured according to a constant-speed stretching method for measuring the tensile strength of GB/T-12914 and 2018, wherein the stretching speed is 20 mm/min;
5. elongation at break: the tensile strength of the paper and the paperboard is measured according to a constant-speed stretching method for measuring the tensile strength of GB/T-12914 and 2018, wherein the stretching speed is 20 mm/min;
the test results are shown in Table 1.
Table 1 results of performance testing
Figure BDA0003628456740000081
Figure BDA0003628456740000082
Figure BDA0003628456740000091
As can be seen from table 1:
the inventor selects proper dispersing agent, defoaming agent and reinforcing fiber to enable the prepared paper base material to have proper air permeability (1700-3500L/m) 2 S @200Pa) and is breathable uniformly. The air permeability is uniform, so that the uniformity of the paper base material is good, and the mechanical property of the paper is better. From the quantitative and air permeability test results of examples 4 and 5 and comparative examples 1 to 5, it can be seen that under the same quantitative conditions (14 to 15 g/m) 2 ) The air permeability of comparative examples 1 to 5 is much higher than that of examples 4 and 5, which indicates that the uniformity of the paper base material in comparative examples 1 to 5 is poor, resulting in deterioration of mechanical properties of the paper base material.
The paper base material prepared by the embodiment of the invention can be used at a lower quantitative (8-15 g/m) 2 ) Has more excellent mechanical properties under the condition that the tensile strength of the paper base material is more than 175N/m and can reach 263N/m, and the elongation at break>7%, up to 8.7%.
The results of comparative examples 1 to 6 show that the high-strength and high-permeability interlaminar toughened synthetic fiber paper base material can be prepared only under the combined action of a specific dispersant, a defoaming agent and reinforcing fibers, so that the paper base material can be better applied to the technical field of liquid forming. When the limit range of the technical scheme of the invention is exceeded, for example, in comparative examples 1 to 3, when sodium hexametaphosphate (inorganic salt dispersant) is used as the dispersant, diesel oil (oil defoamer) is used as the defoamer, or PVA fibers are used as the reinforcing fibers, or in comparative examples 4 to 6, when the dispersant, the defoamer, or the reinforcing fibers are lacked, uniform ventilation and high mechanical properties of the paper-based material cannot be realized.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. A preparation method of a high-strength and high-permeability interlaminar toughened synthetic fiber paper-based material is characterized by comprising the following steps:
s1, defibering: adding the matrix synthetic fiber and the reinforcing fiber into water, then adding a dispersing agent for defibering, and obtaining mixed defibered fiber after defibering;
s2, forming of a paper-based material: adding a defoaming agent into the mixed defibering fibers obtained in the step S1, filtering water to form paper after defoaming, drying and hot-pressing to obtain a high-strength high-permeability interlaminar toughened synthetic fiber paper base material;
wherein, in the step S1, the dispersant is one or a combination of a plurality of nonionic dispersants, anionic dispersants or water-soluble polymer dispersants;
s1, the reinforced fibers are one or a combination of two-component nylon fibers, two-component polyethylene terephthalate fibers or ES fibers;
and S2, the defoaming agent is one or a combination of more of a higher alcohol defoaming agent, an organic silicon defoaming agent or a polyether defoaming agent.
2. The method for preparing the high-strength and high-permeability interlaminar toughened synthetic fiber paper-based material as claimed in claim 1, wherein the dispersant is one or a combination of several of polyoxyethylene ether methylsilane, polyethylene glycol p-isooctylphenyl ether, sodium dodecyl sulfate, sodium alkyl diphenyl ether sulfonate, polyethylene oxide or polyacrylamide.
3. The method for preparing the high-strength and high-permeability interlaminar toughening synthetic fiber paper-based material according to claim 1, wherein the defoaming agent is one or a combination of fatty alcohol-polyoxyethylene ether, alkylphenol ethoxylate, polydimethylsiloxane, secondary octanol or n-butanol.
4. The method for preparing the high-strength and high-permeability interlaminar toughened synthetic fiber paper-based material as claimed in claim 1, wherein the reinforcing fibers are bicomponent nylon fibers and/or bicomponent polyethylene terephthalate fibers.
5. The method for preparing the high-strength and high-permeability interlaminar toughened synthetic fiber paper-based material as claimed in claim 1, wherein the addition amount of the dispersant is 0.2-1% of the weight of the mixed fibers.
6. The method for preparing the high-strength and high-permeability interlaminar toughened synthetic fiber paper-based material as claimed in claim 1, wherein the addition amount of the defoaming agent is 0.1-5% of the weight of the mixed defibering fibers.
7. The preparation method of the high-strength and high-permeability interlaminar toughening synthetic fiber paper base material according to claim 1, wherein in the mixed defibering fibers, the weight ratio of the matrix synthetic fibers to the reinforcing fibers is 1-19: 1.
8. The method for preparing the high-strength and high-permeability interlaminar toughening synthetic fiber paper base material according to claim 1, wherein the matrix synthetic fiber is one or a combination of nylon fiber, polyethylene terephthalate, aramid fiber, carbon fiber or aramid pulp.
9. A high-strength high-permeability interlaminar toughened synthetic fiber paper-based material, which is characterized by being prepared by the preparation method of any one of claims 1 to 8.
10. The use of the high strength, high permeability, interlaminar toughened synthetic fiber paper based material of claim 9 in the field of liquid forming interlaminar toughening technology.
CN202210482628.4A 2022-05-05 2022-05-05 High-strength high-permeability interlaminar toughened synthetic fiber paper base material and preparation method and application thereof Pending CN114892443A (en)

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