CN115305744B - Non-woven fabric for photovoltaic table-board paper and production method thereof - Google Patents

Non-woven fabric for photovoltaic table-board paper and production method thereof Download PDF

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Publication number
CN115305744B
CN115305744B CN202211056483.8A CN202211056483A CN115305744B CN 115305744 B CN115305744 B CN 115305744B CN 202211056483 A CN202211056483 A CN 202211056483A CN 115305744 B CN115305744 B CN 115305744B
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woven fabric
photovoltaic
slurry
melting
mesa
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CN115305744A (en
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赵立新
楼钱
游军
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Anhui Qinglan New Material Technology Co ltd
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Anhui Qinglan New Material Technology Co ltd
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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
    • D21H13/02—Synthetic cellulose fibres
    • D21H13/08—Synthetic cellulose fibres from regenerated cellulose
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/385—Oxides, hydroxides or carbonates
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/54—Starch
    • 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
    • D21H21/10—Retention agents or drainage improvers
    • 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
    • D21H21/14—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 characterised by function or properties in or on the paper
    • D21H21/16—Sizing or water-repelling agents
    • 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
    • D21H21/14—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 characterised by function or properties in or on the paper
    • D21H21/30—Luminescent or fluorescent substances, e.g. for optical bleaching
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Paper (AREA)

Abstract

The invention provides a non-woven fabric for photovoltaic table-board paper and a production method thereof. The production method comprises the steps of mixing polyester fibers and low-melting-point bonding fibers to prepare slurry, diluting the slurry, making the slurry into a net, and drying to obtain a first non-woven fabric; uniformly loading the prepared coating on the surface of the first non-woven fabric, and drying to obtain a second non-woven fabric; and then carrying out hot pressing treatment on the second non-woven fabric, and rewinding and slitting to obtain the non-woven fabric for the photovoltaic table-board paper. Through the mode, the strength and smoothness of the surface of the non-woven fabric can be effectively improved, so that the prepared non-woven fabric has high longitudinal and transverse tensile strength, good uniformity, good thickness consistency and high air permeability, and can meet the performance requirement of the non-woven fabric for the photovoltaic mesa paper; the production method is simple in process and high in controllability, can meet the requirements of industrial production, and has high practical application value.

Description

Non-woven fabric for photovoltaic table-board paper and production method thereof
Technical Field
The invention relates to the technical field of non-woven fabrics, in particular to a non-woven fabric for photovoltaic table-board paper and a production method thereof.
Background
Screen printing is an important process in the production process of photovoltaic cells, is used for printing positive and negative electrodes and back fields on two sides of a coated silicon wafer, and has important significance for improving the production efficiency and photoelectric conversion efficiency of the photovoltaic cells. In the screen printing process, special photovoltaic table paper needs to be arranged on a printing table, the performance of the photovoltaic table paper directly influences the silicon wafer and the screen printing effect, and the photovoltaic table paper with the performance meeting the requirements is of great importance to the production of photovoltaic cell pieces.
At present, the non-woven fabric produced by adopting a dry non-woven fabric production process is generally used for the photovoltaic table-board paper, but the non-woven fabric produced by the method has poor longitudinal and transverse tensile resistance, poor uniformity, large aperture and porosity and poor surface smoothness, and seriously influences the use effect of the non-woven fabric as the non-woven fabric for the photovoltaic table-board paper. The nonwoven fabric produced by the wet process generally has better uniformity than the nonwoven fabric produced by the dry process, but the nonwoven fabric for photovoltaic mesa paper produced by the wet process is still lacking at present. How to improve the existing wet non-woven fabric production process so that the produced non-woven fabric meets the performance requirements of the non-woven fabric for the photovoltaic mesa paper is a problem to be solved currently.
In view of the foregoing, there is a need for an improved nonwoven fabric for photovoltaic mesa paper and a method for producing the same, which solve the above-mentioned problems.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the non-woven fabric for the photovoltaic table paper and the production method thereof, which are characterized in that polyester fibers and low-melting-point bonding fibers are subjected to wet papermaking under low concentration, trace paint is loaded on the surface of the non-woven fabric, the strength and smoothness of the surface of the non-woven fabric are effectively improved, and the non-woven fabric for the photovoltaic table paper with high longitudinal and transverse tensile strength, good uniformity, good thickness uniformity and high air permeability is obtained after hot-pressing treatment, so that the requirements of practical application are met.
In order to achieve the above purpose, the invention provides a production method of a non-woven fabric for photovoltaic mesa paper, comprising the following steps:
s1, mixing polyester fibers and low-melting-point bonding fibers according to a preset mass ratio, preparing slurry with preset concentration, diluting the slurry, making the slurry into a net, and drying to obtain a first non-woven fabric; the melting point of the low-melting-point bonding fiber is 20 ℃ or more lower than that of the polyester fiber;
s2, preparing a predetermined amount of coating, uniformly loading the coating on the surface of the first non-woven fabric obtained in the step S1, and drying to obtain a second non-woven fabric;
and S3, carrying out hot pressing treatment on the second non-woven fabric obtained in the step S2, and rewinding and slitting to obtain the non-woven fabric for the photovoltaic table-board paper.
As a further improvement of the present invention, in step S2, the coating comprises the following components in parts by weight:
CaCO 3 95 to 100 parts of porcelain clay, 0 to 5 parts of latex, 0 to 4 parts of starch, 40 to 60 parts of surface sizing agent, 2 to 4 parts of whitening agent, 0 to 1.5 parts of defoamer and 0.05 to 0.1 part of defoamer.
As a further improvement of the present invention, in step S2, the solid content of the dope is 5wt% to 30wt%; the load capacity of the paint on the surface of the first non-woven fabric is 2-4 g/m 2 。
As a further improvement of the present invention, in step S1, the mass concentration of the slurry is 1% to 2%, and the mass concentration of the slurry after the dilution treatment is 0.01% to 0.08%; preferably, the dilution treatment comprises primary dilution and secondary dilution, wherein the mass concentration of the slurry after primary dilution is 0.2-0.4%, and the mass concentration of the slurry after secondary dilution is 0.02-0.03%.
As a further improvement of the invention, in step S1, a dispersant and an antifoaming agent are also added to the slurry before the primary dilution, wherein the amount of the dispersant is 0.03-0.06% of the mass of the slurry, and the amount of the antifoaming agent is 0.1-0.3% of the mass of the slurry; after the secondary dilution, a retention aid is also added, wherein the consumption of the retention aid is 0.8-2.0% of the mass of the slurry after the secondary dilution; preferably, the dispersing agent is polyethylene oxide, the defoaming agent is a polyether defoaming agent, and the retention aid is polyethylene oxide.
As a further improvement of the present invention, in step S1, the low-melting-point binder fiber has a melting point of 230 to 250 ℃ and a softening point of 100 to 220 ℃; preferably, the melting point of the low-melting point binder fiber is 230 ℃, and the softening point of the low-melting point binder fiber is 180-200 ℃.
As a further improvement of the present invention, in the step S1, the fineness of the polyester fiber is 0.5 to 1.5D, and the length is 2 to 8mm; the fineness of the low-melting-point adhesive fiber is 1.2-2D, and the length is 3-6 mm.
As a further improvement of the present invention, in step S1, the mass ratio of the polyester fiber to the low melting point binder fiber is (50-70): (30-50).
As a further improvement of the present invention, in step S3, the heat press treatment includes a primary heat press treatment and a secondary heat press treatment which are sequentially performed; the temperature of the press roller for one hot pressing treatment is 140-230 ℃, and the thickness of the non-woven fabric after one hot pressing treatment is 0.14-0.16 mm; the temperature of the press roller for the secondary hot pressing treatment is 160-220 ℃, and the thickness of the non-woven fabric after the secondary hot pressing treatment is 0.09-0.12 mm.
In order to achieve the above purpose, the invention also provides a non-woven fabric for the photovoltaic mesa paper, which is prepared according to any one of the technical schemes.
The beneficial effects of the invention are as follows:
(1) According to the production method of the non-woven fabric for the photovoltaic mesa paper, provided by the invention, the polyester fiber and the low-melting-point bonding fiber are subjected to wet papermaking under low concentration, trace paint is loaded on the surface of the non-woven fabric, and then the non-woven fabric is subjected to hot pressing treatment, so that the strength and smoothness of the surface of the non-woven fabric are effectively improved, the prepared non-woven fabric has the advantages of good uniformity, high air permeability, small banner quantitative difference, uniform banner moisture and the like, the paper is uniform in quantitative, thickness and moisture, and the substrate paper is ensured to be uniform in tightness and unbent in both sides in the hot pressing process; meanwhile, the prepared non-woven fabric also has higher longitudinal and transverse tensile strength, and the longitudinal tensile strength can reach more than 8kN/m, so that the performance requirement of the non-woven fabric for the photovoltaic mesa paper can be completely met. In addition, the production method of the non-woven fabric for the photovoltaic mesa paper provided by the invention has the advantages of simple overall process and strong controllability, can meet the requirements of industrial production, and has higher practical application value.
(2) According to the production method of the non-woven fabric for the photovoltaic mesa paper, provided by the invention, the trace coating on the surface of the non-woven fabric can be realized by further regulating and controlling the loading amount of the coating, the fiber on the surface of the non-woven fabric is effectively finished and coated while the ventilation effect of the non-woven fabric is not influenced, the surface binding force among the fibers is improved, and the subsequent hot press treatment is facilitated; meanwhile, the smoothness and the strength of the surface of the non-woven fabric can be effectively improved by preparing the paint with specific composition, so that the prepared non-woven fabric can meet the performance requirement of the non-woven fabric for the photovoltaic table-board paper.
(3) According to the production method of the non-woven fabric for the photovoltaic mesa paper, provided by the invention, the polyester fiber and the low-melting-point bonding fiber are mixed according to a specific proportion, and the melting point and the fineness of the low-melting-point bonding fiber are further limited, so that on one hand, the two temperature change areas of the low-melting-point bonding fiber and the thermal adhesiveness of the low-melting-point bonding fiber are utilized, and the thermal fusion bonding effect and efficiency are effectively improved; on the other hand, the smaller fiber diameter of the low-melting-point bonding fiber also enables the low-melting-point bonding fiber to have a very large specific surface area, and the low-melting-point bonding fiber and the polyester fiber are mixed and made, so that the aperture of the non-woven fabric is more uniform, the interweaving capacity of the fibers can be improved, the bonding of the fibers is facilitated in the process of making a net, the directionality of the fibers is reduced, the non-woven fabric has higher bonding strength and uniformity, the longitudinal and transverse tension ratio can be reduced while the tensile strength is improved after hot pressing, and the air permeability of the non-woven fabric is more uniform while hot melt bonding. Based on the above, the blending of the low-melting-point bonding fiber and the polyester fiber in the invention can effectively improve the uniformity and strength of the non-woven fabric in the processes of papermaking and hot pressing treatment, so that the finally prepared non-woven fabric for the photovoltaic mesa paper has better uniformity and higher strength.
(4) According to the production method of the non-woven fabric for the photovoltaic mesa paper, provided by the invention, the concentration of the slurry is regulated and controlled, and the dispersing agent is added before the slurry is diluted, so that the initial dispersing liquid with higher concentration can be subjected to preliminary dispersion of fibers, then the initial dispersing liquid is diluted step by step, and further the dispersion is continuously carried out step by step, so that larger friction force can be generated between the fibers during dispersion, and the fibers can be dispersed more quickly. Meanwhile, the mode can also avoid the condition of doubling among a plurality of fibers caused by higher fiber concentration in the initial dispersion liquid with higher concentration, thereby reducing the probability of doubling the plurality of fibers in the finally prepared non-woven fabric material and improving the uniformity and air permeability of the non-woven fabric.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to specific embodiments.
In addition, it should be further noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention provides a production method of non-woven fabric for photovoltaic table-board paper, which comprises the following steps:
s1, mixing polyester fibers and low-melting-point bonding fibers according to a preset mass ratio, preparing slurry with preset concentration, diluting the slurry, making the slurry into a net, and drying to obtain a first non-woven fabric; the melting point of the low-melting-point bonding fiber is 20 ℃ or more lower than that of the polyester fiber;
s2, preparing a predetermined amount of coating, uniformly loading the coating on the surface of the first non-woven fabric obtained in the step S1, and drying to obtain a second non-woven fabric;
and S3, carrying out hot pressing treatment on the second non-woven fabric obtained in the step S2, and rewinding and slitting to obtain the non-woven fabric for the photovoltaic table-board paper.
In the step S1, the mass ratio of the polyester fiber to the low-melting-point bonding fiber is (50-70): 30-50; the mass concentration of the slurry is 1-2%, and the mass concentration of the slurry after dilution treatment is 0.01-0.08%; the mass fraction of the papermaking and net forming process is 0.01-0.03%, and the dryness of the net part after dehydration is 20-30%; and the low-melting-point bonding fibers and the polyester fibers contained in the first non-woven fabric are primarily bonded after the drying treatment.
Preferably, the dilution treatment comprises primary dilution and secondary dilution, wherein the mass concentration of the slurry after primary dilution is 0.2-0.4%, and the mass concentration of the slurry after secondary dilution is 0.02-0.03%.
Preferably, before the primary dilution, a dispersing agent and an antifoaming agent are also added into the slurry, wherein the dosage of the dispersing agent is 0.03-0.06% of the mass of the slurry, and the dosage of the antifoaming agent is 0.1-0.3% of the mass of the slurry; after the secondary dilution, a retention aid is also added, wherein the consumption of the retention aid is 0.8-2.0% of the mass of the slurry after the secondary dilution; preferably, the dispersing agent is polyethylene oxide, the defoaming agent is a polyether defoaming agent, and the retention aid is polyethylene oxide.
The melting point of the low-melting-point bonding fiber is 230-250 ℃, and the softening point is 100-230 ℃; preferably, the melting point of the low-melting-point bonding fiber is 230 ℃, and the softening point of the low-melting-point bonding fiber is 180-200 ℃; the fineness of the polyester fiber is 0.5-1.5D, and the length is 2-8 mm; the fineness of the low-melting-point adhesive fiber is 1.2-2D, and the length is 3-6 mm.
Preferably, the low-melting point binder fiber is an undrawn polyester fiber, and the surface is hydrophilized with good dispersibility in water so as to be more uniformly mixed with the polyester fiber in the slurry.
In the step S2, the coating comprises the following components in parts by weight:
CaCO 3 95 to 100 parts of porcelain clay, 0 to 5 parts of latex, 0 to 4 parts of starch, 40 to 60 parts of surface sizing agent, 2 to 4 parts of whitening agent, 0 to 1.5 parts of defoamer and 0.05 to 0.1 part of defoamer.
The solid content of the coating is 5-30wt%; the load capacity of the paint on the surface of the first non-woven fabric is 2-4 g/m 2 。
Preferably, the coating is coated on the surface of the first non-woven fabric by adopting a double-roller surface sizing machine; the transmission side pressure/operation side pressure of the twin-roll surface sizing machine is preferably 16-28/16-28 kN/m.
In step S3, the heat press treatment includes a primary heat press treatment and a secondary heat press treatment which are sequentially performed. Preferably, the primary hot pressing treatment is hard pressing treatment, the temperature of the surface of the metal press roll is 140-230 ℃, and the thickness of the non-woven fabric after the primary hot pressing treatment is 0.14-0.16 mm; the secondary hot pressing treatment is soft pressing treatment, the temperature of the surface of the metal press roller is 160-220 ℃, and the thickness of the non-woven fabric after the secondary hot pressing treatment is 0.09-0.12 mm.
In order to achieve the above purpose, the invention also provides a non-woven fabric for the photovoltaic mesa paper, which is prepared according to any one of the technical schemes.
The nonwoven fabric for photovoltaic mesa paper and the production method thereof according to the present invention will be described below with reference to specific examples and comparative examples.
Example 1
The embodiment provides a production method of a non-woven fabric for photovoltaic table-board paper, which comprises the following steps:
s1, wet papermaking net
The polyester fiber and the low-melting-point bonding fiber are mixed according to the mass ratio of 60:40 to prepare the slurry with the mass concentration of 1 percent. Wherein, the fineness of the polyester fiber is 1D, the length is 5mm, and the melting point is 250 ℃; the low-melting-point bonding fiber is an undrawn polyester fiber with a surface subjected to hydrophilic treatment, the fineness of the undrawn polyester fiber is 1.2D, the length of the undrawn polyester fiber is 5mm, the melting point of the undrawn polyester fiber is 230 ℃, the softening point of the undrawn polyester fiber is 130-200 ℃, and the undrawn polyester fiber has a temporary softening and adhesion effect when the temperature reaches the softening point.
Adding a dispersing agent polyethylene oxide and a polyether defoamer into the slurry before diluting the slurry; wherein, the consumption of the dispersing agent is 0.05% of the mass of the slurry, and the consumption of the defoaming agent is 0.1% of the mass of the slurry. And then the concentration of the slurry is regulated and controlled by adopting an optical detection regulation and control device, the mass concentration of the slurry is regulated to 0.4% through primary dilution, and then the mass concentration of the slurry is regulated to 0.02% through secondary dilution. After the secondary dilution is completed, the slurry is input into a pressure screen for treatment, and a retention aid polyethylene oxide is added at the outlet of the pressure screen, wherein the use amount of the retention aid polyethylene oxide is 0.8% of the mass of the slurry.
Inputting the diluted slurry into an inclined wire headbox to manufacture a wire, wherein the mass fraction of the wire is 0.02%, and the dryness of the wire after dehydration is 30%; then sequentially carrying out squeezing dehydration and drying treatment to obtain the first non-woven fabric. The press dehydration dryness of the press dehydration is 45%, the drying treatment is carried out by adopting a drying cylinder, and the temperature of the drying cylinder is 120 ℃, so that the low-melting-point bonding fibers and the polyester fibers contained in the first non-woven fabric are primarily bonded, and the water content of the finally obtained first non-woven fabric is 6%.
S2, coating trace paint on surface
Weighing the following raw materials in parts by weight:
CaCO 3 98 parts of porcelain clay, 2 parts of latex, 50 parts of starch, 3 parts of surface sizing agent, 1 part of whitening agent and 0.05 part of defoamer.
The raw materials are mixed, added with water and stirred uniformly to prepare the coating with the solid content of 10 weight percent. The coating was then applied to a surface size press of 3g/m using a twin roll 2 The load is coated on the surface of the first non-woven fabric, and then the drying is carried out by using a drying cylinder, so that the water content of the obtained second non-woven fabric is 2%.
S3, hot pressing treatment
And (2) sequentially performing primary hot-pressing treatment and secondary hot-pressing treatment on the second non-woven fabric obtained in the step (S2). Wherein the primary hot pressing treatment is hard pressing treatment, the temperature of the surface of a metal press roll is 230 ℃, and the press roll pressure is regulated to be 70kg/cm, so that the thickness of the non-woven fabric after the primary hot pressing treatment is 0.15mm; the secondary hot pressing treatment is soft pressing treatment, the temperature of the surface of the metal press roller is 220 ℃, and the press roller pressure is regulated to be 110kg/cm, so that the thickness of the non-woven fabric after the secondary hot pressing treatment is 0.10mm.
In the hot pressing treatment process, the semi-melting state of the low-melting point bonding fibers generates bonding strength, so that the short piles erected on the surface of the fiber web are overwhelmed and bonded with each other, and the non-woven fabric for the photovoltaic table paper can be obtained after rewinding, slitting, packaging and warehousing.
The performance test data of the nonwoven fabric for photovoltaic mesa paper prepared in this example are shown in table 1.
Table 1 performance parameters of nonwoven fabric for photovoltaic mesa paper prepared in example 1
Detecting items Detection result
Breadth (mm) 1100
Quantification (g) 69.1
Thickness (um) 90
Tensile Strength (KN/m) The longitudinal direction is more than or equal to 10.20; transverse direction is more than or equal to 4.5
Smoothness(s) Front face: 32; back surface 24
Air permeability (cm 3/cm 2/s) 2.5
As can be seen from table 1, the nonwoven fabric prepared in this embodiment has better uniformity, and has higher longitudinal and transverse tensile strength, smoothness and air permeability, and can meet the performance requirement of the nonwoven fabric for photovoltaic mesa paper.
Examples 2 to 7 and comparative examples 1 to 2
Examples 2 to 7 and comparative examples 1 to 2 respectively provide a production method of a nonwoven fabric for photovoltaic mesa paper, which is different from example 1 in that the mass ratio of polyester fiber to low-melting-point binder fiber in step S1, slurry concentration, the amount of dispersant, defoamer and retention aid are changed, and the like, and the corresponding technological parameters of each example and comparative example are shown in table 2, and the other production methods and technological parameters are the same as those of comparative document 1, and are not repeated herein.
Table 2 process parameters for examples 2 to 7 and comparative examples 1 to 2
Figure BDA0003825527960000081
Figure BDA0003825527960000091
The performance of the nonwoven fabrics for photovoltaic mesa papers prepared in examples 2 to 7 and comparative examples 1 to 2 was measured, and the results are shown in table 3.
Table 3 performance parameters of the nonwoven fabrics for photovoltaic mesa papers prepared in examples 2 to 7 and comparative examples 1 to 2
Figure BDA0003825527960000092
As can be seen from Table 3, the non-woven fabrics for photovoltaic mesa paper prepared in examples 2 to 7 can have a longitudinal tensile strength of 8kN/m or more, and a smoothness of the front surface of 25s or more and an air permeability of 2cm 3 /cm 2 Above/s, the surface uniformity is better, and the performance requirements of the non-woven fabric for the photovoltaic mesa paper can be met. Compared with example 1, the too high concentration of the slurry in comparative example 1 causes poor fiber dispersion uniformity, and the fibers are easy to interweave and flocculate, so that the uniformity of the fiber web formed during papermaking is poor, and the strength and the surface property of the finally prepared non-woven fabric product are directly influenced. In comparative example 2, no dispersant or defoamer was added, and the fiber density was slightly higher than the water density, so that the fibers were easily combined with small bubbles in water during dispersion, and were flocked together, so that there was a problem of small flocks or fiber interweaving during papermaking, resulting in a decrease in the quality of the finally produced nonwoven fabric and poor surface flatness.
Examples 8 to 11 and comparative examples 3 to 4
Examples 8 to 11 and comparative examples 3 to 4 respectively provide a production method of a non-woven fabric for photovoltaic mesa paper, and compared with example 1, the difference is that the composition of the coating in step S2 and the loading amount of the coating on the surface of the first non-woven fabric are changed, the composition and loading amount of the coating corresponding to each example and comparative example are shown in table 4, and the other production methods and process parameters are consistent with those of comparative document 1, and are not repeated herein.
Table 4 process parameters for examples 8 to 11 and comparative examples 3 to 4
Figure BDA0003825527960000101
Figure BDA0003825527960000111
The properties of the nonwoven fabrics for photovoltaic mesa papers prepared in examples 8 to 11 and comparative examples 3 to 4 were measured, and the results are shown in Table 5.
Table 5 performance parameters of the nonwoven fabrics for photovoltaic mesa papers prepared in examples 8 to 11 and comparative examples 3 to 4
Figure BDA0003825527960000112
As can be seen from Table 5, the non-woven fabrics for photovoltaic mesa paper prepared in examples 8 to 11 can have a longitudinal tensile strength of 8kN/m or more, and a smoothness of the front surface of 25s or more and an air permeability of 2cm 3 /cm 2 Above/s, the surface uniformity is better, and the performance requirements of the non-woven fabric for the photovoltaic mesa paper can be met. Comparative example 3, in which calcium carbonate was not added, although the strength was improved to some extent, the smoothness was significantly lower than in the other examples, mainly because the calcium carbonate added in the other examples was able to uniformly cover the nonwoven fabric surface, filling the uneven surface and larger voids formed by the fibers, contributing to good uniformity and smoothnessIs a paper surface of (3). In comparative example 4, the coating amount was increased, and although the smoothness was improved to some extent, the strength was significantly reduced as compared with other examples. Therefore, in order to ensure that the tensile strength and smoothness of the produced nonwoven fabric meet the application requirements, it is necessary to appropriately control the composition of the coating material and the coating amount thereof.
In summary, the invention provides a non-woven fabric for photovoltaic mesa paper and a production method thereof. The production method comprises the steps of mixing polyester fibers and low-melting-point bonding fibers to prepare slurry, diluting the slurry, making the slurry into a net, and drying to obtain a first non-woven fabric; uniformly loading the prepared coating on the surface of the first non-woven fabric, and drying to obtain a second non-woven fabric; and then carrying out hot pressing treatment on the second non-woven fabric, and rewinding and slitting to obtain the non-woven fabric for the photovoltaic table-board paper. Through the mode, the strength and smoothness of the surface of the non-woven fabric can be effectively improved, so that the prepared non-woven fabric has high longitudinal and transverse tensile strength, good uniformity, good thickness consistency and high air permeability, and can meet the performance requirement of the non-woven fabric for the photovoltaic mesa paper; the production method is simple in process and high in controllability, can meet the requirements of industrial production, and has high practical application value.
The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention.

Claims (11)

1. The production method of the non-woven fabric for the photovoltaic table-board paper is characterized by comprising the following steps of:
s1, mixing polyester fibers and low-melting-point bonding fibers according to a preset mass ratio, preparing slurry with preset concentration, diluting the slurry, making the slurry into a net, and drying to obtain a first non-woven fabric; the melting point of the low-melting-point bonding fiber is 20 ℃ or more lower than that of the polyester fiber;
s2, weighing the following raw materials in parts by weight:
CaCO 3 95 to 100 parts of porcelain clay, 0 to 5 parts of latex, 0 to 4 parts of starch, 40 to 60 parts of surface sizing agent, 2 to 4 parts of whitening agent, 0 to 1.5 parts of defoamer and 0.05 to 0.1 part of defoaming agent;
mixing the raw materials, adding water, uniformly stirring to prepare a coating with the solid content of 5-30wt%, uniformly loading the coating on the surface of the first non-woven fabric obtained in the step S1, and drying to obtain a second non-woven fabric; the load capacity of the paint on the surface of the first non-woven fabric is 2-4 g/m 2 ；
And S3, carrying out hot pressing treatment on the second non-woven fabric obtained in the step S2, and rewinding and slitting to obtain the non-woven fabric for the photovoltaic table-board paper.
2. The method for producing a nonwoven fabric for photovoltaic mesa paper according to claim 1, characterized in that: in the step S1, the mass concentration of the slurry is 1% -2%, and the mass concentration of the slurry after dilution treatment is 0.01% -0.08%.
3. The production method of the nonwoven fabric for photovoltaic mesa paper according to claim 2, characterized in that: the dilution treatment comprises primary dilution and secondary dilution, wherein the mass concentration of the slurry after primary dilution is 0.2-0.4%, and the mass concentration of the slurry after secondary dilution is 0.02-0.03%.
4. The method for producing a nonwoven fabric for photovoltaic mesa paper according to claim 3, wherein: in the step S1, a dispersing agent and an antifoaming agent are also added into the slurry before the primary dilution, wherein the dosage of the dispersing agent is 0.03-0.06% of the mass of the slurry, and the dosage of the antifoaming agent is 0.1-0.3% of the mass of the slurry; after the secondary dilution, a retention aid is also added, and the consumption of the retention aid is 0.8-2.0% of the mass of the slurry after the secondary dilution.
5. The method for producing a nonwoven fabric for photovoltaic mesa paper according to claim 4, wherein: the dispersing agent is polyethylene oxide, the defoaming agent is polyether defoaming agent, and the retention aid is polyethylene oxide.
6. The method for producing a nonwoven fabric for photovoltaic mesa paper according to claim 1, characterized in that: in the step S1, the melting point of the low-melting-point bonding fiber is 230-250 ℃, and the softening point is 100-230 ℃.
7. The method for producing a nonwoven fabric for photovoltaic mesa paper according to claim 6, wherein: the melting point of the low-melting-point bonding fiber is 230 ℃, and the softening point of the low-melting-point bonding fiber is 180-200 ℃.
8. The method for producing a nonwoven fabric for photovoltaic mesa paper according to claim 1, characterized in that: in the step S1, the fineness of the polyester fiber is 0.5-1.5D, and the length is 2-8 mm; the fineness of the low-melting-point adhesive fiber is 1.2-2D, and the length is 3-6 mm.
9. The method for producing a nonwoven fabric for photovoltaic mesa paper according to claim 1, characterized in that: in the step S1, the mass ratio of the polyester fiber to the low-melting-point bonding fiber is (50-70): (30-50).
10. The method for producing a nonwoven fabric for photovoltaic mesa paper according to claim 1, characterized in that: in step S3, the hot press treatment includes a primary hot press treatment and a secondary hot press treatment which are sequentially performed; the temperature of the press roller for one hot pressing treatment is 140-230 ℃, and the thickness of the non-woven fabric after one hot pressing treatment is 0.14-0.16 mm; the temperature of the press roller for the secondary hot pressing treatment is 160-220 ℃, and the thickness of the non-woven fabric after the secondary hot pressing treatment is 0.09-0.12 mm.
11. The utility model provides a non-woven fabrics for photovoltaic mesa paper which characterized in that: the nonwoven fabric for photovoltaic mesa paper is produced according to the production method of any one of claims 1 to 10.
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