CN113529475A - Production method of high-temperature-resistant insulating paperboard - Google Patents
Production method of high-temperature-resistant insulating paperboard Download PDFInfo
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- CN113529475A CN113529475A CN202110850504.2A CN202110850504A CN113529475A CN 113529475 A CN113529475 A CN 113529475A CN 202110850504 A CN202110850504 A CN 202110850504A CN 113529475 A CN113529475 A CN 113529475A
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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
- 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
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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
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
- D21H11/04—Kraft or sulfate pulp
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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
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
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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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/07—Nitrogen-containing compounds
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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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/14—Carboxylic acids; Derivatives thereof
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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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/47—Condensation polymers of aldehydes or ketones
- D21H17/48—Condensation polymers of aldehydes or ketones with phenols
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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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/53—Polyethers; Polyesters
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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
- 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
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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
- 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
- D21H21/22—Agents rendering paper porous, absorbent or bulky
- D21H21/24—Surfactants
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/48—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances fibrous materials
- H01B3/52—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances fibrous materials wood; paper; press board
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Abstract
The invention discloses a production method of a high-temperature-resistant insulating paper board, which selects meta-position chopped aramid fiber and 100% unbleached sulfate softwood pulp as raw materials, adds acrylamide and water-soluble phenolic resin into the 100% unbleached sulfate softwood pulp, adds pure water, acrylate and polyether into the meta-position chopped aramid fiber for treatment and mixing, and then obtains a final product after pulping, paper machine papermaking, press hot pressing, cutting and shaping. The invention can increase the temperature resistant grade of the insulating paper board of the existing A-grade transformer from 105 ℃ to 130 ℃, thereby reducing the influence of aging and damage on the insulating material caused by overheating in the running process of the transformer, and further improving the service life and safe running performance of the transformer.
Description
Technical Field
The invention belongs to the technical field of insulating product production, and particularly relates to a production method of a high-temperature-resistant insulating paperboard.
Background
Along with the development of society, electric power application is more and more widespread, and the importance of electrical equipment, especially transformer equipment, is more and more apparent to the continuous improvement of power supply requirement. The transformer is used as an energy conversion device, energy loss is inevitable during operation, and the energy loss is mainly represented by temperature rise of the transformer. The temperature inside the oil-immersed transformer rises continuously along with the increase of the operation time, the change of temperature rise, the oxidation of transformer oil, the degradation of oil quality and the like, the insulating material which is one of important components of the transformer is greatly influenced by the temperature in the working operation, the allowable temperature of the transformer is determined by the temperature resistance strength of the internal insulating material, if the operation temperature of the transformer exceeds the allowable value for a long time, the insulating material is easy to be influenced by the high temperature to age and damage in an accelerated way, when the insulating material ages to a certain degree, the insulating material is broken under the action of operation vibration and electric power, the electric breakdown fault is easy to occur, and the service life of the transformer is shortened.
Most of the power transformers in China adopt A-level insulation (105 degrees). For class a insulated transformers, the insulating cardboard ensures a service life of about 20 years if the transformer is kept running normally. Otherwise, the service life is reduced according to the 6 ℃ law (the service life is reduced by half for every 6 ℃ rise of the insulation temperature of the class A, and the law is called the 6 ℃ law of thermal aging). With the increasing progress of living standard and science and technology, the requirement of families and industry on the stability of power supply is higher and higher, and the stability of power supply is closely related to the reliable operation of electrical equipment such as transformers and the like. How to improve the temperature resistance strength of the insulating material in the A-level transformer subsequently reduces the aging risk of the insulating paper board caused by the rise of the heating temperature of the transformer, and further improves the service performance and the service life of the transformer, which is a problem of key attention in the transformer industry and the upstream insulating material industry.
The invention content is as follows:
the technical problem to be solved by the invention is as follows: the production method of the high-temperature-resistant insulating paperboard is provided, the temperature resistance grade of the insulating paperboard of the existing A-grade transformer can be improved from 105 ℃ to 130 ℃, so that the influence of aging and damage on insulating materials caused by overheating in the operation process of the transformer is reduced, and the service life and the safe operation performance of the transformer are further improved.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a production method of high-temperature-resistant insulating paperboard comprises the following steps:
s1, selecting raw materials: selecting meta-position chopped aramid fiber and 100% unbleached sulfate softwood pulp as raw materials;
s2, defibering (pulping) of the pulp:
a. adding pure water into 100% unbleached sulfate softwood pulp to enable the concentration of the mixed pulp to be 5-6%, fluffing the pulp into a fibrous state, standing for 1.5-2 h, adding 8.0-11% of acrylamide and 10-12% of water-soluble phenolic resin according to the mass ratio of 10: 1-10: 5 between 100% unbleached sulfate softwood pulp and a nonionic high polymer surfactant (the mass sum of the acrylamide and the water-soluble phenolic resin), stirring for 20-30 min to fully mix the three, and standing for 0.5-1 h for later use;
b. adding pure water into the meta-position chopped aramid fibers to enable the concentration of the mixed slurry to be 5-6%, stirring for 20-30 minutes, and standing for 0.5-1 h; subsequently, adding 3.5-5.5% of acrylate and 3.0-5.0% of polyether in a mass ratio of 10: 1-10: 5 of meta-position chopped aramid fiber and nonionic polymer surfactant (the mass sum of the acrylate and the polyether), stirring for 20-30 minutes, fully mixing the three, and standing for 1-2 hours for later use;
c. mixing the materials obtained in the step a and the step b according to the mass ratio of 100% of unbleached sulfate softwood pulp to meta-position chopped aramid fiber of 8: 2-6: 4, stirring for 1-2 h, and standing for 1-2 h for later use;
s3, grinding: grinding the mixed material obtained in the step S2 into slurry, and reserving the ground slurry for later use;
s4, paper making by a paper machine: adding a high molecular retention aid polyacrylamide into the ground mixed fiber slurry according to the use amount of 8-10 kg per ton of paper, stirring for 20-30 minutes, and standing and curing for 30-60 minutes; then the pulp is treated by a material door for concentration adjustment, three sections of low-concentration slag removers, a pressure screen and the like, and the pulp is pumped to a net part for papermaking and forming, and is squeezed into a wet paper board by three carrier rollers for later use;
s5, hot pressing by a press: hot pressing wet paper boards after pre-assembling and board mounting; before pressing, the temperature of the hot water tower is set to be 135-150 ℃, and the temperature of the pressing plate is increased to be 140-150 ℃. The pressure maintaining time is 15-35 MPa for the first section, 25-333 minutes for the second section, 5-28 MPa for the second section, 3-30 minutes for the second section, 0-20 MPa for the third section, 0-15 minutes for the pressure maintaining time, 0-6 MPa for the fourth section, 0-10 minutes for the pressure maintaining time, and 30 seconds for the pressure increasing time; after the whole pressure maintaining time is over, obtaining a pressed dry paperboard;
and S6, cutting and shaping the pressed dry paperboard to obtain a final product.
Preferably, the intermediate chopped aramid fiber in the step S1 is a m-chopped aramid fiber with a length requirement of 2-3 mm; the 100% unbleached sulfate softwood pulp is 100% unbleached sulfate softwood pulp imported from pure China (Sweden or Canada), the fiber length is 2-3 mm, the wall thickness is 2.2-2.5 mu m, the fiber diameter is 0.02-0.03 mm, the ash content is not more than 0.5%, and the conductivity is not higher than 6.5 mS/m.
2-3 mm meta-position chopped aramid fiber is selected, the thickness is 1.5um, and the specific surface area can reach 55m2The length-thickness ratio can reach 1666:1, the aramid fiber is soft and in a floating silk shape, and the structural parameters ensure that the chopped aramid fiber has good evenness in water; the molecular arrangement is regular and sawtooth-shaped, and the heat resistance (decomposition temperature) is excellent>400 deg.C), flame resistance (limiting oxygen index)>29%) and insulating properties; the flame retardant does not generate obvious decomposition and carbonization at high temperature, does not delay combustion in flame and has better flame retardance; has super high bonding property with wood pulp fiber compared with other fiber。
Selecting pure unbleached sulfate softwood pulp with 100 percent of import, mature trees, long fibers, low coarseness, extremely low ash content of 0.1-0.25 percent, ring crush index of 15-16 N.m/g and burst index of 6.0-6.5 kPa.m2The material has the advantages of a tensile index of 50-60 Nm/g, a conductivity of 2-3 mS/m, natural high strength and high insulating property.
Preferably, in the step S2-a, 100% unbleached sulfate softwood pulp is put into a D-type hydraulic pulper, pure water with the conductivity lower than 18uS/cm is added to make the concentration of the mixed pulp be 5-6%, the D-type hydraulic pulper is utilized to defiber the pulp board into fibers, and then the pulp board is kept stand for 1.5-2 hours to make the fibers fully swell in a pure water environment; and adding 8.0-11% of acrylamide and 10-12% of water-soluble phenolic resin into 100% of unbleached sulfate softwood pulp and 10:1 of nonionic high polymer surfactant (the mass sum of the acrylamide and the water-soluble phenolic resin), stirring for 20-30 min to fully mix the unbleached sulfate softwood pulp, the non-ionic high polymer surfactant and the water-soluble phenolic resin, and standing for 0.5-1 h for later use.
Preferably, in the step S2-b, pure water with the conductivity lower than 18uS/cm is added into the meta-position chopped aramid fibers, the concentration of the mixed slurry is kept at 5-6%, the mixture is stirred for 20-30 min, and then the mixture is kept still for 0.5-1 h; and then adding 3.5-5.5% of acrylate and 3.0-5.0% of polyether into the meta-position chopped aramid fiber and the nonionic polymer surfactant (the mass sum of the acrylate and the polyether) according to a mass ratio of 10:1, stirring for 20-30 minutes to fully mix the three, and standing for 1-2 hours for later use.
Preferably, in the step S2-c, the materials obtained in the step S2-a and the step S2-b are mixed according to the mass ratio of 100% of unbleached sulfate softwood pulp to meta-position chopped aramid fiber of 8:2, stirred for 1-2 hours, and then kept stand for 1-2 hours for later use.
Preferably, in the step S3, the mixed material obtained in the step S2 is subjected to impurity removal treatment by a high-concentration slag remover and a pre-mill iron remover, and then is ground by a cylindrical mill until the beating degree of the pulp reaches (38 ± 1) ° SR and the wet weight reaches (9-13) g, and then the ground pulp is reserved.
Preferably, in step S4, after the aged slurry is adjusted to be thick by the flowmeter and the concentration adjuster, further impurity removal treatment is carried out by a three-section type low-concentration slag remover, a pressure screen and a front iron remover of a paper machine, then the mixture is conveyed to a net part pulp flow box, under the action of a pulp distributor and a pulp homogenizing roller in a pulp flowing box, high-uniformity pulp is sprayed on a forming net through a pulp flowing box upper-wire device according to certain flow and pressure, then is subjected to dehydration papermaking treatment through a breast roller, a chopping board, a chopping roller and a vacuum suction box with the vacuum degree of 0.05-0.08 MPa to form wet paper with the water content of (79 +/-1)% in a further cylinder, and then is subjected to the squeezing action of a first prepressing roller, a second prepressing roller and a main carrier roller, after a circular forming cylinder body with the diameter of 2960mm, the face width of 2600mm and the wall thickness of more than or equal to 26mm is wound for a certain number of turns, the circular forming cylinder body is cut by a large cylinder cutter to form a wet paper board with the water content of (65 +/-1)% discharged from the cylinder for later use.
Further, in the step S4, the concentration of the pulp in the headbox is controlled to be (0.005-0.008)% (the concentration of the pulp in the headbox is too high, the uniformity of the pulp on the headbox is not good, the dewatering condition of the pulp at the wire part is affected, and the pulp with too high concentration is easy to paste, which is not beneficial to normal production); the concentration of the slurry in the bin gate box is controlled to be (3.5 +/-0.1)% (mass ratio: absolute dry mass of the slurry/(total mass of the slurry (including water) × 100%), the diameter of a nozzle of a three-section slag separator is 8/6/6mm, a screen gap of a pressure screen is 0.35mm, the moisture of a wet paper sheet entering a cylinder is (79 +/-1)%, and then the wet paper sheet is squeezed by a first prepressing roll, a second prepressing roll and a main carrier roller with the pressure of 0.25/0.25/0.35MPa, and the moisture of the wet paper sheet leaving the cylinder is (65 +/-1)%.
Preferably, the wet paperboard cut off from the forming cylinder in the step S5 is transported to a press by a pre-loader and a plate loader for hot pressing; and setting production process parameters according to the thickness of the paperboard, and obtaining the pressed dry paperboard after the press opens the paperboard after the whole pressure maintaining time is over.
Preferably, in the step S6, before the dry cardboard is cut and shaped, the finished board is turned over and selected.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
according to the invention, the non-ionic polymer surfactant acrylamide and the water-soluble phenolic resin which are selected in the step S2 are added into the wood pulp fiber, no micelle is formed, the dispersion force is good, the uniformity of the aramid fiber and the wood pulp fiber is improved when the aramid fiber is mixed with the wood pulp fiber, the aramid fiber can be uniformly distributed in the wood pulp fiber, an excellent condition is created for the fusion of the aramid fiber and the wood pulp fiber, the hydroxyl in the molecule and the hydrogen atoms in the wood pulp fiber molecule form a stable hydrogen bond under the connecting action of a water bridge, and the hydrogen bonds formed in the fiber molecule and between the molecules are added, so that the intermolecular structure of the wood pulp fiber is more stable, and the mechanical, electrical and heat resistance of the prepared product are more excellent;
the non-ionic surfactant acrylate and polyether are selected to obviously increase the polarity among aramid fiber molecules, increase the specific surface area of fiber molecules and enhance the adsorption capacity of the fibers, and are non-ionic surfactants, so that the non-ionic surfactant is added into wood pulp fibers but does not have any influence on the insulating property of the wood pulp fibers, and is more favorable for the fusion between the aramid fiber molecules and the wood pulp fiber molecules;
in the step S4, the concentration of the polyacrylamide as the macromolecular retention aid is controlled to be 0.5-0.6%, the polyacrylamide can effectively prevent the loss of nonionic macromolecular surfactants such as acrylamide, water-soluble phenolic resin, acrylate and polyether, and can effectively retain fine fibers in the fibers, so that the retention rate of the fibers is improved, a foundation is laid for the combination and lap-joint papermaking forming of the fibers, and the binding force between the fibers is improved. Impurities such as microparticle rubber, magnetic sludge, iron powder and the like in the slurry can be effectively removed through the material door box, the three-section slag separator, the pressure screen and the iron remover, the cleanliness of the used slurry is remarkably improved, the slurry is clean and uniform, and the change of the heat-resisting strength of subsequent paper forming in mechanical, electrical and hot pressing is not influenced by other impurities. The concentration of control flow thick liquids in the pulp box can prevent effectively that the fibre from flocculating, promotes the thick liquids uniformity for aramid fiber and wood pulp fiber combine evenly. Through squeezing, redundant free water is squeezed out, so that lap joint and combination between aramid fiber and wood pulp fiber are firmer, the distance between hydrogen atoms in the wood pulp fiber and molecules of acrylamide and water-soluble phenolic resin is reduced, more hydrogen bonds are formed between the internal hydroxyl and the hydrogen atoms, the intermolecular structure of the wood pulp fiber is more stable, and the mechanical, electrical and heat resistance of a subsequent paperboard is improved;
in a word, the raw materials of the invention adopt optimized selection and optimized proportioning; the addition of the nonionic high-molecular surfactant and the high-molecular retention aid improves the ultrahigh uniformity of the aramid fiber in the wood pulp fiber slurry, so that the molecular structure of the wood pulp fiber is more stable, the polarity of the aramid fiber is enhanced, the bonding adsorption energy is remarkably increased, and the loss of the aramid fiber, the wood pulp fine fiber and the high-molecular surfactant in the papermaking process of the paper stock can be remarkably reduced; and the temperature resistance level of the paperboard is successfully improved from 105 ℃ to 130 ℃ by combining the adjustment and optimization of equipment and process parameters of each process. The invention improves the adaptability of the paperboard, meets the customer requirements and improves the product competitiveness.
Detailed Description
The technical solution of the present invention is further described below with reference to examples:
the first embodiment is as follows:production of 3.0mm paperboard
S1, selecting raw materials
Meta-position chopped aramid fiber with the length of 2.5 mm; pure imported 100% unbleached sulfate softwood pulp (Swedish electronic grade aspeba pulp, Canada electronic grade George prince pulp), 3mm fiber length, 2.5um wall thickness, 0.03mm fiber diameter, 0.3% ash content, 3.0mS/m conductivity.
S2 defibering (pulping) of pulp
a. 1200kg of pure unbleached sulfate softwood pulp (600kg of aspeba +600kg of georgen) with 100% import was placed in a D-type hydropulper, and 22800kg of pure water with a conductivity of less than 18uS/cm was added to bring the concentration of the mixed pulp to 5%. And (3) opening a D-type water conservancy pulper, fluffing the pulp board into fibers, then opening a pulp lifting pump, pumping the pulp board into a pre-grinding pool A, and standing for 2 hours to ensure that the fibers are fully swollen in a pure water environment. Then, according to the principle that the ratio of 100% unbleached sulfate softwood pulp to the nonionic polymer surfactant (the sum of acrylamide and water-soluble phenolic resin) is 10:1, 60kg of 8.0% acrylamide and 60kg of 10% water-soluble phenolic resin are added, a forebay grinding propeller is started, the mixture is stirred for 30 minutes to be fully mixed, and then the mixture is kept stand for 1 hour for standby.
b. According to the principle that the ratio of wood pulp raw materials to the chopped aramid fibers is 8:2, 300kg of meta-position chopped aramid fibers with the length of 2.5mm are put into a pre-grinding pool B, 5700kg of pure water with the conductivity lower than 18uS/cm is added, the concentration of the mixed slurry is 5%, a propeller is started to stir for 30 minutes, and the aramid fibers are placed for 1 hour after being fully swelled. And then according to the principle that the proportion of the chopped aramid fiber to the nonionic polymer surfactant (the sum of the acrylic ester and the polyether) is 10:1, adding 15kg of acrylic ester with the concentration of 4.5 percent and 15kg of polyether with the concentration of 4 percent, starting a propeller to stir for 20 minutes, fully mixing the three, and standing for 1.5 hours for later use.
c. And (4) starting a pulp lifting pump of the pre-grinding pool B in the step B, pumping the mixed aramid fiber pulp into the pre-grinding pool A, simultaneously starting a propeller, stirring for 1.5 hours, ensuring that the aramid fiber pulp and the wood pulp fiber pulp are uniformly mixed, and standing for 2 hours for later use.
S3 grinding to obtain pulp
And (3) starting a pulp extracting pump of the pre-grinding pool A, performing impurity removal treatment by a high-concentration slag remover and a pre-grinding iron remover, and then performing pulp grinding by adopting an Andrews CS380 two cylindrical mills in series, wherein the pulp grinding power is controlled at 240kw/h, the pulp grinding concentration is controlled at 5%, the pulp grinding time is 30 min/well, the beating degree reaches 38 DEG SR, and when the wet weight is 11.5g, starting a discharge valve, and putting the ground pulp into a post-grinding well for later use.
S4, paper machine manufacturing
And (5) starting a post-grinding pool slurry pump, and pumping the ground mixed fiber slurry to a gate well. 9kg of macromolecular retention aid polyacrylamide with the concentration of 0.5 percent is stirred for 30 minutes by starting a propeller and is aged for 40 minutes. And (3) subsequently, adjusting the concentration of the pulp to (3.0 +/-0.1)% by a flowmeter and a concentration regulator, pumping to a material gate box, further removing impurities by a three-section low-concentration slag remover with the nozzle diameter of 8/6/6mm, a pressure screen with the screen slot of 0.35mm and a front iron remover of a paper machine, and pumping to a net part pulp flow box by a fan pump. The method comprises the steps of obtaining high-uniformity slurry with the concentration of 0.6% under the action of a slurry distributor and a homogenizing roller in a slurry box, spraying the slurry with uniform uniformity on a forming net through a lip plate according to a certain flow and pressure by an upper net device of the slurry box, further dehydrating and papermaking by a breast roller, a table plate, the table roller and a vacuum suction box with the vacuum degree of 0.06MPa to form wet paper with the water content of 79% in a cylinder, then performing squeezing by a first pre-pressing roller, a second pre-pressing roller and a main carrier roller with the pressure of 0.25/0.25/0.35MPa on a circular forming cylinder body with the diameter of 2960mm, the surface width of 2600mm and the wall thickness of more than or equal to 26mm for a certain number of turns, and cutting by a large cylinder knife to form a wet paper board with the water content of 65% in the cylinder for later use.
S5, hot pressing by a press
After the wet paper plate enters the press, a pressure boosting button is clicked, a pressure boosting pump and a pressure maintaining pump are started, and an energy storage pump is started to provide hydraulic oil of a main oil cylinder, so that the main oil cylinder can rise quickly. After the plate is combined, when the pressure of the pressing machine reaches 4.0MPa and the pressure of the energy storage tank is reduced to 3.0MPa, the energy storage pump participates in energy storage of the energy storage tank, and when the energy storage reaches 4.0MPa, the energy storage pump is stopped. And the booster pump and the pressure maintaining pump continue to participate in the boosting of the press until the pressure of the press reaches 28MPa, the booster pump is stopped, the pressure maintaining pump participates in the pressure maintaining, and when the pressure is lower than 28.5MPa, the pressure maintaining pump is started to supplement the pressure. The whole boosting time is controlled to be 1 minute, and the energy storage pump participates in the energy storage for 6 minutes. And when the pressure of the first section of the press reaches 28MPa, the pressure maintaining time is 65min, the oil unloading valve is closed when the pressure of the second section of the press is reduced to 24MPa, the pressure maintaining time is 5min, and the like, when the pressure of the third section of the press is reduced to 16MPa, the pressure maintaining time is 5min, and when the pressure of the fourth section of the press is reduced to 6MPa, the pressure maintaining time is 10 min. After the whole pressure maintaining time is over, after the board is opened by the press, the dry paperboard is adsorbed by the board unloading trolley and then enters the finished board turning and selecting process.
S6 finished product of paper
And conveying the rough plates to a shearing machine according to the order requirements of customers, and slitting, sorting and packaging the rough plates by using a longitudinal and transverse sawing machine.
Example two:production of 3.0mm paperboard
In the production process of the embodiment, the ratio of the wood pulp raw material to the nonionic polymer surfactant (the sum of acrylamide and water-soluble phenolic resin) is adjusted to 10:2, and 120kg of 8.0% acrylamide and 120kg of 10% water-soluble phenolic resin are added; the other process conditions were the same as in example one.
Example three:third production of 3.0mm paperboard
In the production process of the embodiment, the ratio of the wood pulp raw material to the nonionic polymer surfactant is adjusted to 10:3, and 180kg of 8.0% acrylamide and 180kg of 10% water-soluble phenolic resin are added; the rest process conditions are unchanged.
Example four:production of 3.0mm cardboard
In the production process of the embodiment, the ratio of the wood pulp raw material to the nonionic polymer surfactant is adjusted to 10:4, 240kg of 8.0% acrylamide and 240kg of 10% water-soluble phenolic resin are added; the rest process conditions are unchanged.
Example five:production of 3.0mm cardboard
In the production process of the embodiment, the ratio of the wood pulp raw material to the nonionic polymer surfactant is adjusted to 10:5, 300kg of 8.0% acrylamide and 300kg of 10% water-soluble phenolic resin are added; the rest process conditions are unchanged.
To summarize:
through the comparative test examples, after the 3.0mm paperboard is produced, samples are respectively taken and placed for 7 days at the oven temperature of 158 ℃ according to the short-term oven aging test principle, and finally taken out together and balanced for 2 hours at room temperature, and then the tensile strength index is detected. Specific experimental data are shown in table 1:
table 1 examples one to five comparative test data:
remarking: the product qualification standard is defined as: the tensile strength at normal temperature is MPa (the longitudinal direction is more than or equal to 120, the transverse direction is more than or equal to 85), and the ratio of the tensile strength after baking to the tensile strength at normal temperature is more than or equal to 50%.
And (4) conclusion: as seen by the comparative test data of examples one to five: the wood pulp raw material and the nonionic polymer surfactant are in the optimal ratio of 10:1, the obtained final product is optimal, and the temperature-resistant grade requirement of 130 ℃ is met.
Example six:six of 3.0mm cardboard production
In the production process of the embodiment, the proportion of the aramid fiber raw material to the nonionic polymer surfactant is adjusted to 10:2, and 30kg of acrylic ester with the concentration of 4.5% and 30kg of polyether with the concentration of 4% are added; the rest process conditions are unchanged.
Example seven:seven for the production of 3.0mm cardboard
In the production process of the embodiment, the proportion of the aramid fiber raw material to the nonionic polymer surfactant is adjusted to 10:3, 45kg of acrylic ester with the concentration of 4.5 percent and 45kg of polyether with the concentration of 4 percent are added; the rest process conditions are unchanged.
Example eight:eight for the production of 3.0mm cardboard
In the production process of the embodiment, the proportion of the aramid fiber raw material to the nonionic polymer surfactant is adjusted to 10:4, 60kg of acrylic ester with the concentration of 4.5 percent and 60kg of polyether with the concentration of 4 percent are added; the rest process conditions are unchanged.
Example nine:nine for the production of 3.0mm cardboard
In the production process of the embodiment, the ratio of the wood pulp raw material to the nonionic polymer surfactant is 10:5, 75kg of acrylic ester with the concentration of 4.5% and 75kg of polyether with the concentration of 4% are added; the rest process conditions are unchanged.
To summarize:
through the comparative test examples, after the 3.0mm paperboard is produced, the samples and the products obtained in the first example are respectively sampled and are respectively placed for 7 days at the oven temperature of 158 ℃ according to the short-term oven aging test principle, and finally the samples are taken out together and balanced for 2 hours at room temperature, and then the tensile strength index is detected. Specific experimental data are shown in table 2:
table 2 example one, six, seven, eight, nine comparative test data:
remarking: the product qualification standard is defined as: the tensile strength at normal temperature is Mpa (longitudinal is more than or equal to 120, transverse is more than or equal to 85), and the ratio of the tensile strength after baking to the tensile strength at normal temperature is more than or equal to 50%.
And (4) conclusion: according to the comparative test data of the first embodiment, the sixth embodiment and the ninth embodiment: the proportion of the aramid fiber raw material to the nonionic polymer surfactant is the optimal proportion when the proportion is 10:1, the obtained final product is optimal, and the requirement of 130-DEG C temperature resistance grade is met.
Example ten:ten for production of 3.0mm paperboard
In the production process of the embodiment, only acrylate, namely a nonionic polymer surfactant, is added into the aramid fiber (according to the principle that the proportion of the chopped aramid fiber to the nonionic polymer surfactant (acrylate) is 10:1, 30kg of acrylate with the concentration of 4.5% is added, then a propeller is started to stir for 20 minutes), polyether is not added any more, and other process conditions are not changed.
To summarize:
according to the tenth comparative test example, after the production of the 3.0mm paperboard is finished, the paperboard and the product obtained in the first example are respectively sampled and are respectively placed for 7 days at the oven temperature of 158 ℃ according to the short-term oven aging test principle, and finally, the paperboard and the product are taken out together and balanced for 2 hours at room temperature, and then the tensile strength index is detected. Specific experimental data are shown in table 3:
table 3 example one, ten comparative test data:
remarking: the product qualification standard is defined as: the tensile strength at normal temperature is Mpa (longitudinal is more than or equal to 120, transverse is more than or equal to 85), and the ratio of the tensile strength after baking to the tensile strength at normal temperature is more than or equal to 50%.
And (4) conclusion: as seen by the comparative test data of example one to example ten: compared with a 3.0mm paperboard produced by singly adding acrylate, namely a nonionic polymer surfactant, the aramid fiber raw material added with polyether is superior in both mechanical strength index and insulating paperboard temperature resistance grade because: after polyether is added into aramid fiber, the transverse and longitudinal tensile strength is obviously improved, and the production process requirements are met; based on the polarity of the polyether and the lower viscosity coefficient, a very stable lubricant film with high adsorption capacity and bearing capacity can be formed in the process of fusing the polyether with the wood pulp fiber, so that the bonding and overlapping capacity of the wood pulp fiber and the aramid fiber is obviously improved, and the mechanical shear resistance and the high temperature resistance of the produced final product are more excellent.
Example eleven:eleven production of 3.0mm paperboard
In the production process of the embodiment, the ratio of wood pulp to aramid fiber is adjusted to 7:3, 514kg of meta-position chopped aramid fiber with the length of 2.5mm is put into a pre-grinding pool B, and other process conditions are unchanged.
Example twelve:twelve for 3.0mm paperboard production
In the production process of the embodiment, the ratio of wood pulp to aramid fiber is adjusted to 6:4, 800kg of meta-position chopped aramid fiber with the length of 2.5mm is put into a pre-grinding pool B, and other process conditions are unchanged.
To summarize:
through the comparative test examples, after the production of the 3.0mm paperboard is finished, the paperboard and the product obtained in the first example are respectively sampled and are respectively placed for 7 days at the oven temperature of 158 ℃ according to the short-term oven aging test principle, and finally, the paperboard and the product are taken out together and balanced for 2 hours at room temperature, and then the tensile strength index is detected. Specific experimental data are shown in table 4:
table 4 example one, eleven, twelve comparative test data:
remarking: the product qualification standard is defined as: the tensile strength at normal temperature is Mpa (longitudinal is more than or equal to 120, transverse is more than or equal to 85), and the ratio of the tensile strength after baking to the tensile strength at normal temperature is more than or equal to 50%.
And (4) conclusion: as can be seen from the comparative test data of example one and examples eleven and twelve: the wood pulp fiber and aramid fiber are in the optimal ratio of 8:2, the obtained final product is optimal, and the temperature-resistant grade requirement of 130 ℃ is met.
Example thirteen:one of 4.0mm cardboard production
S1, selecting raw materials
Meta-position chopped aramid fiber with the length of 2.5 mm; pure imported 100% unbleached sulfate softwood pulp (Swedish electronic grade aspeba pulp, Canada electronic grade George prince pulp), 3mm fiber length, 2.5um wall thickness, 0.03mm fiber diameter, 0.3% ash content, 3.0mS/m conductivity.
S2 defibering (pulping) of pulp
a. 1200kg of pure unbleached sulfate softwood pulp (600kg of aspeba +600kg of georgen) with 100% import was placed in a D-type hydropulper, and 22800kg of pure water with a conductivity of less than 18uS/cm was added to bring the concentration of the mixed pulp to 5%. And (3) opening a D-type water conservancy pulper, fluffing the pulp board into fibers, then opening a pulp lifting pump, pumping the pulp board into a pre-grinding pool A, and standing for 2 hours to ensure that the fibers are fully swollen in a pure water environment. Then, according to the principle that the ratio of 100% unbleached sulfate softwood pulp to the nonionic polymer surfactant (the sum of acrylamide and water-soluble phenolic resin) is 10:1, 60kg of 8.0% acrylamide and 60kg of 10% water-soluble phenolic resin are added, a forebay grinding propeller is started, the mixture is stirred for 30 minutes to be fully mixed, and then the mixture is kept stand for 1 hour for standby.
b. According to the principle that the ratio of wood pulp raw materials to the chopped aramid fibers is 8:2, 300kg of meta-position chopped aramid fibers with the length of 2.5mm are put into a pre-grinding pool B, 5700kg of pure water with the conductivity lower than 18uS/cm is added, the concentration of the mixed slurry is 5%, a propeller is started to stir for 30 minutes, and the aramid fibers are placed for 1 hour after being fully swelled. And then according to the principle that the proportion of the chopped aramid fiber to the nonionic polymer surfactant (the sum of the acrylic ester and the polyether) is 10:1, adding 15kg of acrylic ester with the concentration of 4.5 percent and 15kg of polyether with the concentration of 4 percent, starting a propeller to stir for 20 minutes, fully mixing the three, and standing for 1.5 hours for later use.
c. And (4) starting a pulp lifting pump of the pre-grinding pool B in the step B, pumping the mixed aramid fiber pulp into the pre-grinding pool A, simultaneously starting a propeller, stirring for 1.5 hours, ensuring that the aramid fiber pulp and the wood pulp fiber pulp are uniformly mixed, and standing for 2 hours for later use.
S3 grinding to obtain pulp
And (3) starting a pulp extracting pump of the pre-grinding pool A, performing impurity removal treatment by a high-concentration slag remover and a pre-grinding iron remover, and then performing pulp grinding by adopting an Andrews CS380 two cylindrical mills in series, wherein the pulp grinding power is controlled at 260kw/h, the pulp grinding concentration is controlled at 5%, the pulp grinding time is 35 min/well, the beating degree reaches 38 DEG SR, and when the wet weight is 11.5g, starting a discharge valve, and putting the ground pulp into a post-grinding well for later use.
S4, paper machine manufacturing
And (5) starting a post-grinding pool slurry pump, and pumping the ground mixed fiber slurry to a gate well. 9kg of macromolecular retention aid polyacrylamide with the concentration of 0.5 percent is stirred for 30 minutes by starting a propeller and is aged for 40 minutes. And (3) subsequently, adjusting the concentration of the pulp to (3.0 +/-0.1)% by a flowmeter and a concentration regulator, pumping to a material gate box, further removing impurities by a three-section low-concentration slag remover with the nozzle diameter of 8/6/6mm, a pressure screen with the screen slot of 0.35mm and a front iron remover of a paper machine, and pumping to a net part pulp flow box by a fan pump. The method comprises the steps of obtaining high-uniformity slurry with the concentration of 0.6% under the action of a slurry distributor and a homogenizing roller in a slurry box, spraying the slurry with uniform uniformity on a forming net through a lip plate according to a certain flow and pressure by an upper net device of the slurry box, further dehydrating and papermaking by a breast roller, a table plate, the table roller and a vacuum suction box with the vacuum degree of 0.06MPa to form wet paper with the water content of 79% in a cylinder, then performing squeezing by a first pre-pressing roller, a second pre-pressing roller and a main carrier roller with the pressure of 0.25/0.25/0.35MPa on a circular forming cylinder body with the diameter of 2960mm, the surface width of 2600mm and the wall thickness of more than or equal to 26mm for a certain number of turns, and cutting by a large cylinder knife to form a wet paper board with the water content of 65% in the cylinder for later use.
S5, hot pressing by a press
After the wet paper plate enters the press, a pressure boosting button is clicked, a pressure boosting pump and a pressure maintaining pump are started, and an energy storage pump is started to provide hydraulic oil of a main oil cylinder, so that the main oil cylinder can rise quickly. After the plate is combined, when the pressure of the pressing machine reaches 4.0MPa and the pressure of the energy storage tank is reduced to 3.0MPa, the energy storage pump participates in energy storage of the energy storage tank, and when the energy storage reaches 4.0MPa, the energy storage pump is stopped. And the booster pump and the pressure maintaining pump continue to participate in the boosting of the press until the pressure of the press reaches 28MPa, the booster pump is stopped, the pressure maintaining pump participates in the pressure maintaining, and when the pressure is lower than 28.5MPa, the pressure maintaining pump is started to supplement the pressure. The whole boosting time is controlled to be 1 minute, and the energy storage pump participates in the energy storage for 6 minutes. And when the pressure of the first section of the press reaches 28MPa, maintaining the pressure for 75min, subsequently automatically opening the oil discharge valve, closing the oil discharge valve when the pressure of the second section of the press is reduced to 24MPa, maintaining the pressure for 10min, and so on, when the pressure of the third section of the press is reduced to 18MPa, maintaining the pressure for 10min, and when the pressure of the fourth section of the press is reduced to 6MPa, maintaining the pressure for 5 min. After the whole pressure maintaining time is over, after the board is opened by the press, the dry paperboard is adsorbed by the board unloading trolley and then enters the finished board turning and selecting process.
S6 finished product of paper
And conveying the rough plates to a shearing machine according to the order requirements of customers, and slitting, sorting and packaging the rough plates by using a longitudinal and transverse sawing machine.
Example fourteen:production of 5.0mm paperboard
S1, selecting raw materials
Meta-position chopped aramid fiber with the length of 2.5 mm; pure imported 100% unbleached sulfate softwood pulp (Swedish electronic grade aspeba pulp, Canada electronic grade George prince pulp), 3mm fiber length, 2.5um wall thickness, 0.03mm fiber diameter, 0.3% ash content, 3.0mS/m conductivity.
S2 defibering (pulping) of pulp
a. 1200kg of pure unbleached sulfate softwood pulp (600kg of aspeba +600kg of georgen) with 100% import was placed in a D-type hydropulper, and 22800kg of pure water with a conductivity of less than 18uS/cm was added to bring the concentration of the mixed pulp to 5%. And (3) opening a D-type water conservancy pulper, fluffing the pulp board into fibers, then opening a pulp lifting pump, pumping the pulp board into a pre-grinding pool A, and standing for 2 hours to ensure that the fibers are fully swollen in a pure water environment. Then, according to the principle that the ratio of 100% unbleached sulfate softwood pulp to the nonionic polymer surfactant (the sum of acrylamide and water-soluble phenolic resin) is 10:1, 60kg of 8.0% acrylamide and 60kg of 10% water-soluble phenolic resin are added, a forebay grinding propeller is started, the mixture is stirred for 30 minutes to be fully mixed, and then the mixture is kept stand for 1 hour for standby.
b. According to the principle that the ratio of wood pulp raw materials to the chopped aramid fibers is 8:2, 300kg of meta-position chopped aramid fibers with the length of 2.5mm are put into a pre-grinding pool B, 5700kg of pure water with the conductivity lower than 18uS/cm is added, the concentration of the mixed slurry is 5%, a propeller is started to stir for 30 minutes, and the aramid fibers are placed for 1 hour after being fully swelled. And then according to the principle that the proportion of the chopped aramid fiber to the nonionic polymer surfactant (the sum of the acrylic ester and the polyether) is 10:1, adding 15kg of acrylic ester with the concentration of 4.5 percent and 15kg of polyether with the concentration of 4 percent, starting a propeller to stir for 20 minutes, fully mixing the three, and standing for 1.5 hours for later use.
c. And (4) starting a pulp lifting pump of the pre-grinding pool B in the step B, pumping the mixed aramid fiber pulp into the pre-grinding pool A, simultaneously starting a propeller, stirring for 1.5 hours, ensuring that the aramid fiber pulp and the wood pulp fiber pulp are uniformly mixed, and standing for 2 hours for later use.
S3 grinding to obtain pulp
And (3) starting a pulp extracting pump of the pre-grinding pool A, removing impurities through a high-concentration slag remover and a pre-grinding iron remover, and then pulping by adopting an Andrews CS380 two cylindrical mills in series, wherein the pulping power is controlled at 280kw/h, the pulping concentration is controlled at 5%, the pulping time is 40 min/well, the beating degree reaches 38 DEG SR, and when the wet weight is 11.5g, a discharge valve is opened, and the ground pulp is put into a post-grinding well for later use.
S4, paper machine manufacturing
And (5) starting a post-grinding pool slurry pump, and pumping the ground mixed fiber slurry to a gate well. 9kg of macromolecular retention aid polyacrylamide with the concentration of 0.5 percent is stirred for 30 minutes by starting a propeller and is aged for 40 minutes. And (3) subsequently, adjusting the concentration of the pulp to (3.0 +/-0.1)% by a flowmeter and a concentration regulator, pumping to a material gate box, further removing impurities by a three-section low-concentration slag remover with the nozzle diameter of 8/6/6mm, a pressure screen with the screen slot of 0.35mm and a front iron remover of a paper machine, and pumping to a net part pulp flow box by a fan pump. The method comprises the steps of obtaining high-uniformity slurry with the concentration of 0.6% under the action of a slurry distributor and a homogenizing roller in a slurry box, spraying the slurry with uniform uniformity on a forming net through a lip plate according to a certain flow and pressure by an upper net device of the slurry box, further dehydrating and papermaking by a breast roller, a table plate, the table roller and a vacuum suction box with the vacuum degree of 0.06MPa to form wet paper with the water content of 79% in a cylinder, then performing squeezing by a first pre-pressing roller, a second pre-pressing roller and a main carrier roller with the pressure of 0.25/0.25/0.35MPa on a circular forming cylinder body with the diameter of 2960mm, the surface width of 2600mm and the wall thickness of more than or equal to 26mm for a certain number of turns, and cutting by a large cylinder knife to form a wet paper board with the water content of 65% in the cylinder for later use.
S5, hot pressing by a press
After the wet paper plate enters the press, a pressure boosting button is clicked, a pressure boosting pump and a pressure maintaining pump are started, and an energy storage pump is started to provide hydraulic oil of a main oil cylinder, so that the main oil cylinder can rise quickly. After the plate is combined, when the pressure of the pressing machine reaches 4.0MPa and the pressure of the energy storage tank is reduced to 3.0MPa, the energy storage pump participates in energy storage of the energy storage tank, and when the energy storage reaches 4.0MPa, the energy storage pump is stopped. And the booster pump and the pressure maintaining pump continue to participate in the boosting of the press until the pressure of the press reaches 28MPa, the booster pump is stopped, the pressure maintaining pump participates in the pressure maintaining, and when the pressure is lower than 28.5MPa, the pressure maintaining pump is started to supplement the pressure. The whole boosting time is controlled to be 1 minute, and the energy storage pump participates in the energy storage for 6 minutes. And when the pressure of the first section of the press reaches 28MPa, the pressure maintaining time is 125min, the oil unloading valve is closed when the pressure of the second section of the press is reduced to 24MPa by automatically opening the oil unloading valve, the pressure maintaining time is 15min, and by analogy, when the pressure of the third section of the press is reduced to 20MPa, the pressure maintaining time is 10min, and when the pressure of the fourth section of the press is reduced to 6MPa, the pressure maintaining time is 10 min. After the whole pressure maintaining time is over, after the board is opened by the press, the dry paperboard is adsorbed by the board unloading trolley and then enters the finished board turning and selecting process.
S6 finished product of paper
And conveying the rough plates to a shearing machine according to the order requirements of customers, and slitting, sorting and packaging the rough plates by using a longitudinal and transverse sawing machine.
To summarize:
through the thirteen and fourteen embodiments, the 3.0-5.0 mm paperboard samples produced by combining the product obtained in the first embodiment with the prior art (currently, 100% unbleached kraft softwood pulp is adopted for production, and the samples are taken from the products produced by the company in 2021 year 2-3 month, and are respectively 3.0mm paperboard and product roll number 2102201823001, 4.0mm paperboard and product roll number 2103081822004, and 5.0mm paperboard and product roll number 2103151824001), the samples are respectively placed for 7 days at the oven temperature of 158 ℃ according to the short-term oven aging test principle, and finally the samples are taken out together and balanced at room temperature for 2 hours, and then the tensile strength indexes are detected, compared and data are counted, wherein the specific data are shown in table 5:
TABLE 5 comparative test data for 3.0-5.0 mm paperboard produced in accordance with the present invention and prior art
Remarking: the product qualification standard is defined as: the tensile strength at normal temperature is Mpa (longitudinal is more than or equal to 120, transverse is more than or equal to 85), and the ratio of the tensile strength after baking to the tensile strength at normal temperature is more than or equal to 50%.
And (4) conclusion: by comparing the index conditions of the 3.0-5.0 mm paperboard samples produced by the technology of the invention with those produced by the prior art, the requirement that products with various thicknesses meet the temperature resistance level of 130 ℃ of the insulating paperboard is verified, and the product quality is improved.
It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Claims (10)
1. The production method of the high-temperature-resistant insulating paperboard is characterized by comprising the following steps:
s1, selecting raw materials: selecting meta-position chopped aramid fiber and 100% unbleached sulfate softwood pulp as raw materials;
s2, defibering slurry:
a. adding pure water into 100% unbleached sulfate softwood pulp to enable the concentration of the mixed pulp to be 5-6%, fluffing the pulp into a fibrous state, standing for 1.5-2 h, adding acrylamide and water-soluble phenolic resin according to the proportion of 100% unbleached sulfate softwood pulp to the mixture of acrylamide and water-soluble phenolic resin in a mass ratio of 10: 1-10: 5, wherein the concentration of the acrylamide is 8.0-11%, the concentration of the water-soluble phenolic resin is 10-12%, stirring for 20-30 min to fully mix the three, and standing for 0.5-1 h for later use;
b. adding pure water into the meta-position chopped aramid fibers to enable the concentration of the mixed slurry to be 5-6%, stirring for 20-30 minutes, and standing for 0.5-1 h; then adding acrylic ester and polyether according to the mass ratio of 10: 1-10: 5 of the meta-position chopped aramid fiber to the mixture of the acrylic ester and the polyether, wherein the concentration of the acrylic ester is 3.5-5.5%, and the concentration of the polyether is 3.0-5.0%; then stirring for 20-30 minutes to fully mix the three, and standing for 1-2 hours for later use;
c. mixing the materials obtained in the step a and the step b according to the mass ratio of 100% of unbleached sulfate softwood pulp to meta-position chopped aramid fiber of 8: 2-6: 4, stirring for 1-2 h, and standing for 1-2 h for later use;
s3, grinding: grinding the mixed material obtained in the step S2 into slurry, and reserving the ground slurry for later use;
s4, paper making by a paper machine: adding a high molecular retention aid polyacrylamide into the ground mixed fiber slurry according to the use amount of 8-10 kg per ton of paper, stirring for 20-30 minutes, and standing and curing for 30-60 minutes; then after concentration adjustment and impurity removal treatment, the wet paper is manufactured and molded and squeezed into a wet paper board for later use;
s5, hot pressing by a press: hot pressing wet paper boards after pre-assembling and board mounting; before pressing, the temperature of the hot water tower is set to be 135-150 ℃, and the temperature of the pressing plate is increased to be 140-150 ℃. The pressure maintaining time is 15-35 MPa for the first section, 25-333 minutes for the second section, 5-28 MPa for the second section, 3-30 minutes for the second section, 0-20 MPa for the third section, 0-15 minutes for the pressure maintaining time, 0-6 MPa for the fourth section, 0-10 minutes for the pressure maintaining time, and 30 seconds for the pressure increasing time; after the whole pressure maintaining time is over, obtaining a pressed dry paperboard;
and S6, cutting and shaping the pressed dry paperboard to obtain a final product.
2. The method for producing a high temperature resistant insulation paperboard according to claim 1, characterized in that: the length of the meta-position chopped aramid fiber in the step S1 is 2-3 mm; the length of fibers of 100% unbleached sulfate softwood pulp is 2-3 mm, the wall thickness is 2.2-2.5 um, the fiber diameter is 0.02-0.03 mm, the ash content is not more than 0.5%, and the conductivity is not more than 6.5 mS/m.
3. The method for producing a high temperature resistant insulation paperboard according to claim 1, characterized in that: step a in the step S2 is to put 100% unbleached sulfate softwood pulp into a D-type hydraulic pulper, add pure water with the conductivity lower than 18uS/cm to make the concentration of the mixed pulp be 5-6%, defiber, and stand for 1.5-2 hours after defibering into a fibrous state; then, adding 8.0-11% of acrylamide and 10-12% of water-soluble phenolic resin according to the mass ratio of 10:1, stirring for 20-30 min, and standing for 0.5-1 h for later use.
4. The method for producing a high temperature resistant insulation paperboard according to claim 1, characterized in that: step b in the step S2 is to add pure water with the conductivity lower than 18uS/cm into the meta-position chopped aramid fiber until the concentration of the slurry is kept at 5-6%, stir for 20-30 min, and then stand for 0.5-1 h; then adding 3.5-5.5% of acrylate and 3.0-5.0% of polyether according to the mass ratio of 10:1, stirring for 20-30 min, and standing for 1-2 h for later use.
5. The method for producing a high temperature resistant insulation paperboard according to claim 1, characterized in that: and step c in the step S2, mixing and stirring the materials obtained in the step a and the step b in the step S2 for 1-2 hours according to the mass ratio of 100% of unbleached sulfate softwood pulp to the meta-position chopped aramid fiber being 8:2, and standing for 1-2 hours for later use.
6. The method for producing a high temperature resistant insulation paperboard according to claim 1, characterized in that: and step S3, removing impurities from the mixed material obtained in the step S2 by a high-concentration slag remover and a pre-mill iron remover, grinding the mixed material into thick liquid by a cylindrical mill until the beating degree of the thick liquid reaches (38 +/-1) ° SR and the wet weight reaches (9-13) g, and then reserving the ground thick liquid for later use.
7. The method for producing a high temperature resistant insulation paperboard according to claim 1, characterized in that: in the step S4, the cured pulp is subjected to pulp concentration adjustment through a flowmeter and a concentration adjustment meter, then is further subjected to impurity removal through a three-section low-concentration slag remover, a pressure screen and a paper machine front iron remover, and then is conveyed to a net part head box, forming high-uniformity pulp in a pulp flowing box under the action of a pulp distributor and a pulp homogenizing roller, spraying the pulp with uniform uniformity on a forming net through a lip plate according to certain flow and pressure by a pulp flowing box net feeding device, further dehydrating and papermaking by a breast roller, a chopping board, a chopping roller and a vacuum suction box with the vacuum degree of 0.05-0.08 MPa to form wet paper with the water content of 78-80% in a cylinder, then pressing by a first prepressing roller, a second prepressing roller and a main carrier roller, after being wound for a certain number of turns on a circular forming cylinder body with the diameter of 2960mm, the face width of 2600mm and the wall thickness of more than or equal to 26mm, the wet paper board with the water content of 64% -66% is formed after being cut by a large cylinder knife.
8. The method for producing a high temperature resistant insulation paperboard according to claim 7, characterized in that: in the step S4, the online concentration of the slurry in the slurry box is controlled to be 0.005-0.008%; the slurry concentration of the bin gate box is controlled to be 3.4-3.6%; the diameter of a nozzle of the three-section slag remover is 8/6/6mm, and the sieve gap of the pressure sieve is 0.35 mm; 78-80% of water of the wet paper sheet entering the cylinder, and 64-66% of water of the wet paper sheet exiting the cylinder under the squeezing action of the first prepressing roll, the second prepressing roll and the main carrier roller with the pressure of 0.25/0.25/0.35 MPa.
9. The method for producing a high temperature resistant insulation paperboard according to claim 1, characterized in that: and (5) conveying the wet paperboard cut off from the forming cylinder in the step (S5) to a press through a pre-loading machine and a plate loading machine for hot pressing, and obtaining the pressed dry paperboard after the whole pressure maintaining time is over.
10. The method for producing a high temperature resistant insulation paperboard according to claim 1, characterized in that: in the step S6, before the dry paperboard is cut and shaped, the finished board is turned over and selected.
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| US5087513A (en) * | 1990-12-07 | 1992-02-11 | Hoechst Celanese Corp. | Flame retardant film and composite containing superabsorbent polymer |
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