CN112726247A - Transparent paper for printing and packaging and preparation method thereof - Google Patents
Transparent paper for printing and packaging and preparation method thereof Download PDFInfo
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- CN112726247A CN112726247A CN202110006222.4A CN202110006222A CN112726247A CN 112726247 A CN112726247 A CN 112726247A CN 202110006222 A CN202110006222 A CN 202110006222A CN 112726247 A CN112726247 A CN 112726247A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/34—Kneading or mixing; Pulpers
- D21B1/345—Pulpers
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C1/00—Pretreatment of the finely-divided materials before digesting
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
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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
- D21H21/16—Sizing or water-repelling agents
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
Abstract
The invention discloses transparent paper for printing and packaging and a preparation method thereof, wherein the preparation method comprises the following steps: step S1: mixing crushed pulp prepared by crushing plant fiber wood pulp and a fiber modifier, and adding the mixture into counter-rotating pulping equipment for fiber modification chemical reaction; step S2: extruding the material obtained in the step S1 by adopting an extruding device, and extracting the extruded solid material for later use; step S3: fully dissolving the solid material obtained in the step S2 by using clear water; step S4: filtering the dissolved substance obtained in the step S3 by using filtering equipment again for standby; step S5: adding the transparent emulsion into the solid slurry obtained in the step S4, dissolving and uniformly mixing to prepare transparent slurry; step S6: the paper making aid is added again to the transparent paste prepared in step S5, and paper making is performed. The invention realizes the rapid, industrialized and large-scale production of the transparent paper, improves the production efficiency and reduces the production cost.
Description
Technical Field
The invention relates to the technical field of papermaking, in particular to a preparation method of transparent paper for printing and packaging.
Background
The transparent paper has excellent optical property, mechanical property, thermal stability, surface property, environment-friendly property, rapid natural degradation and other properties, and has very important scientific research value and wide application prospect in various fields of electronic devices, buildings, arts, printing and packaging and the like.
At present, the transparent paper becomes a new product which is developed rapidly in the field of paper, and although the history of the transparent paper is earlier, the transparent paper with high transparency is just started, and the domestic research is still a very important and latest scientific research direction.
However, the conventional transparent paper has many problems in practice, one is that the conventional transparent paper is actually semitransparent, has low transparency, and has poor transparency when the gram weight is higher, so that the application of the conventional transparent paper is greatly limited; and secondly, the traditional transparent paper has great environmental pollution in the production process, for example, the vulcanized parchment paper is not only polluted to social environment, but also is not beneficial to the health of production workers.
In addition, although technical methods of the transparent paper such as a nano cellulose method, an oxidation method, an impregnation method, etc. have been developed in recent years; however, these methods still have many problems: firstly, most of the products are in the laboratory stage and cannot be produced in an industrialized, large-scale and large-batch manner; secondly, the steps of the methods are complicated and are in the research and exploration stage; thirdly, the methods have no special production equipment or are processed by other equipment and other various processes, have the problems of long process flow, time and labor waste, low production efficiency, high waste products, high product price, high energy consumption, environmental pollution, high selectivity on raw materials and the like, and are not suitable for industrial large-scale production; fourthly, many transparent papers are easy to deform, become hard and crisp, and the final packaging product is difficult to form and use.
Therefore, it is an urgent need for those skilled in the art to develop a transparent paper suitable for printed matters, solve the disadvantages of the conventional transparent paper, and perform industrial mass production.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of transparent paper for printing and packaging, and realizing industrial large-scale production of the transparent paper.
In order to solve the technical problems, the invention adopts the following technical scheme: a preparation method of transparent paper for printing and packaging comprises the following steps:
step S1: mixing crushed pulp prepared by crushing plant fiber wood pulp and a fiber modifier, and adding the mixture into counter-rotating pulping equipment for fiber modification chemical reaction;
the contra-rotating pulping equipment comprises a rack, a tank body and a driving device, wherein the tank body and the driving device are arranged on the rack, two impeller devices are arranged in the tank body, the driving device drives the two impeller devices to rotate in opposite directions, and the slurry in the tank body is continuously dispersed and forms colliding vortexes through the rotation of the two impeller devices in opposite directions; the tank body is provided with a constant-temperature heating device for heating the slurry at constant temperature, and the constant-temperature heating device is controlled by a temperature control device;
step S2: extruding the material obtained in the step S1 by adopting an extruding device, and extracting the extruded solid material for later use;
step S3: fully dissolving the solid material obtained in the step S2 by using clear water;
step S4: filtering the dissolved substance obtained in the step S3 by using filtering equipment again for standby;
step S5: adding the transparent emulsion into the solid slurry obtained in the step S4, dissolving and uniformly mixing to prepare transparent slurry;
step S6: the paper making aid is added again to the transparent paste prepared in step S5, and paper making is performed.
Preferably, the fiber modifier comprises an etherifying agent, alcohols and an auxiliary agent, wherein the etherifying agent is one or more of a solid cationic etherifying agent, a liquid cationic etherifying agent, cationic monomer dimethyl diallyl ammonium chloride, a high-retention cationic etherifying agent and a non-gelatinized starch cationic etherifying agent; the alcohol is one or more of ethanol, isopropanol and n-butanol; the auxiliary agent is one or more of azacyclo-carbene, 1-chlorine-2-hydroxy-propane-3-sulfonic acid sodium, 8-diazabicyclo [5.4.0] undec-7-ene, caustic soda, sodium carbonate and 3-chlorine-2-hydroxy propane sulfonic acid sodium salt.
Preferably, the etherifying agent, the alcohol and the auxiliary agent are mixed according to the mass ratio of 1: 10: 4-1: 25: 6, the preparation is carried out.
Preferably, the mass ratio of the plant fiber wood pulp to the fiber modifier is 1: 5 to 10.
Preferably, the chemical reaction temperature is 45-75 ℃, the reaction time is 1H-3H, and high-speed stirring of 800-2000 rpm is continuously carried out in the reaction process so as to facilitate uniform and thorough reaction.
Preferably, in step S6, a shoe press is used in the paper press process, and a soft calendering or a metal belt calendering is used.
Preferably, the extrusion device in step S2 is a screw type extrusion device; the draining device in the step S4 is a horizontal centrifuge.
Preferably, the adding ratio of the solid slurry and the transparent emulsion in the step S5 is, by solid content, the solid slurry: clear emulsion 1: 0.05 to 0.15.
Preferably, the raw materials of the transparent emulsion comprise the following components in parts by mass:
preferably, the aqueous transparent resin is one or more of aqueous acrylic resin, aqueous polyurethane resin, aqueous epoxy resin and polyvinyl alcohol; the transparent cross-linking agent is one or more of aziridine, polyethylenimine, polycarbodiimide, carbodiimide, water-based isocyanate, pyridine, water-based amino resin and polyethyleneimine cross-linking agent; the transparent softening agent is one or more of SME-4, polyoxyethylene, organosilicon quaternary ammonium salt and polyethylene wax; the defoaming agent is a special defoaming agent for fatty alcohol papermaking.
Preferably, the raw materials of the transparent emulsion are mixed and added with clear water, the solid content is controlled between 20 and 45 percent, and then the raw materials are subjected to shear emulsification for 15 to 30 minutes by a shear emulsifier at the rotating speed of 8000 to 20000 revolutions per minute to form uniform transparent emulsion.
The invention also provides the transparent paper for printing and packaging, which is prepared by the preparation method of the transparent paper for printing and packaging.
According to the technical scheme, common plant paper pulp is used as a raw material, under the constant temperature heating condition of a special counter-rotating type pulping device, the common continuous circulation action of forward and reverse high-speed rotation of 2 impeller devices of the device is used for dispersing and formed colliding vortex for physical disintegration and dispersion, under the chemical reaction action of various chemicals, the common plant paper pulp is extruded, drained and dissolved, and further subjected to compounding and uniform treatment of transparent emulsion, so that the common plant paper pulp is prepared into transparent paper pulp with excellent performance; then, making paper by a conventional papermaking process, wherein shoe pressing and soft calendering are adopted in the papermaking pressing process, and the pressure is about half of the conventional papermaking pressure; and other steps are carried out according to the existing papermaking process, so that the papermaking of the paper is finished, and the transparent paper is successfully prepared.
Therefore, the rapid, industrialized and large-scale production of the transparent paper is realized, a plurality of problems of the existing transparent paper are solved, the production efficiency is improved, and the production cost is reduced.
The following detailed description of the present invention will be provided in conjunction with the accompanying drawings.
Drawings
The invention is further described with reference to the accompanying drawings and the detailed description below:
FIG. 1 is a schematic view of the assembly structure of counter-rotating pulping equipment adopted by the invention;
FIG. 2 is a schematic sectional view of a tank structure in a counter-rotating pulping apparatus employed in the present invention;
in the figure: 1-top cover, 2-tank body, 3-impeller device, 4-constant temperature heating device, 5-temperature control device, 6-discharging device, 7-driving device, 8-working platform, 9-frame and 10-control system.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be appreciated by those skilled in the art that features from the examples and embodiments described below may be combined with each other without conflict.
A preparation method of transparent paper for printing and packaging comprises the following steps:
step S1, preparing a plant fiber wood pulp dry pulp board;
step S2, crushing the dry pulp by a crusher, and weighing for later use;
step S3, weighing and preparing chemicals for later use;
step S4, uniformly adding the crushed dry pulp obtained in the step S2 and the chemicals obtained in the step S3 into a special counter-rotating pulping device according to a certain proportion to perform fiber modification chemical reaction;
s5, extruding the material obtained in the step S4 by adopting an extruding device, extracting the extruded solid material for later use, and recycling the extruded liquid;
s6, fully dissolving the solid material obtained in the step S5 with clear water;
step S7, filtering the dissolved substance obtained in the step S6 by using filtering equipment again for standby;
step S8, adding the material obtained in the step S7 into transparent emulsion according to a certain proportion, dissolving and uniformly mixing to prepare transparent slurry;
step S9, adding sizing agent, retention aid, moisture regulator and the like into the transparent slurry prepared in the step S8 again to prepare slurry before papermaking by adopting the existing paper papermaking process, and papermaking the paper; wherein, shoe press is adopted in the paper-making press process, and soft press polish or metal belt press polish is adopted; and other steps are carried out according to the existing papermaking process to finish the papermaking of the paper.
Preferably, the plant fiber wood pulp is one or two of bleached needle pulp and bleached broad-leaf pulp.
Preferably, the chemicals are various substances and comprise etherifying agents, alcohols and auxiliaries, wherein the etherifying agents are one or more of solid cationic etherifying agents EPTAC, liquid cationic etherifying agents CHPTAC, cationic monomer dimethyl diallyl ammonium chloride, high-retention cationic etherifying agents (GF-1882) and non-gelatinized starch cationic etherifying agents (GF-1883); the alcohol is one or more of ethanol, isopropanol, and n-butanol; the auxiliary agent is one or more of N-heterocyclic carbene (NHC), 1-chlorine-2-hydroxy-propane-3-sulfonic acid sodium, 8-diazabicyclo [5.4.0] undec-7-ene (DBU), caustic soda, sodium carbonate and 3-chlorine-2-hydroxy propane sulfonic acid sodium salt; and the mass ratio of 1: 10: 4-1: 25: 6, for example, 1: 11: 4,1: 15: 4,1: 20: 4,1: 25: 5.
preferably, the mass ratio of the plant fiber wood pulp to the fiber modifier is 1: 5 to 10.
Preferably, the chemical reaction temperature is 45-75 ℃, the reaction time is 1H-3H, and high-speed stirring of 800-2000 rpm is continuously carried out in the reaction process so as to facilitate uniform and complete reaction.
Preferably, the material extrusion of step S5 is a screw type extrusion device.
Preferably, the clean water of step S6 is a three-stage filtered clean water, and must not contain visible and insoluble impurity particles.
Preferably, the draining device of step S7 may be a horizontal centrifuge device or other existing devices.
Preferably, the adding proportion of the step S8 is solid slurry, generally based on the solid content of two types of substances: clear emulsion 1: 0.05 to 0.15, such as 1: 0.05,1: 0.1,1: 0.12,1: 0.15.
preferably, in step S9, a currently common papermaking process is adopted as needed, an auxiliary agent is added to perform pulping and blending, and a currently common papermaking device such as a fourdrinier machine and a cylinder machine is adopted to perform papermaking.
The structure of the counter-rotating pulping device adopted in the step S4 is shown in fig. 1 and 2, and includes a frame 9, a tank 2 and a driving device 7 mounted on the frame 9, and a top cover 1 is arranged on the top of the tank 2. The two impeller devices 3 are arranged in the tank body 2, the driving device 7 is used for driving the two impeller devices 3, the slurry in the tank body is continuously dispersed and the formed common continuous circulation effect of the colliding vortex is realized through the forward and reverse high-speed rotation of the two impeller devices 3, and the slurry is continuously subjected to high-speed physical disintegration and dispersion and becomes transparent under the effect of chemical reaction. A constant-temperature heating device 4 for heating the reaction slurry at a constant temperature is arranged on the tank body 2, and the constant-temperature heating device 4 is controlled by a temperature control device 5; the bottom of the tank body 2 is provided with a discharge opening, and the discharge opening is connected with a discharge device 6 for discharging the prepared transparent slurry.
As an embodiment, the impeller device 3 includes an impeller shaft and a plurality of impeller blades uniformly distributed along the impeller shaft in a spiral shape, the number of the impeller blades can be appropriately changed according to the length of the impeller shaft, and the impeller blades are uniformly spaced along the axial direction and the circumferential direction of the impeller shaft. The two impeller devices 3 are correspondingly arranged at the left side and the right side of the tank body, and the axial projections of the central axes of the impeller shafts of the two impeller devices 3 are superposed, so that the effect of colliding vortex can be maximized, and the reaction slurry acts on the reaction slurry.
In this embodiment, the tank 2 is cylindrical and extends in the horizontal direction, and in order to ensure that the impeller devices 3 act on the slurry better, the impeller shafts of the two impeller devices 3 are overlapped with the central axis of the tank.
As an embodiment, the constant temperature heating device 4 includes a water bath cavity attached to the outer wall of the tank body, and the water bath cavity is provided with a water filling port and a water outlet and is connected with a hot water tank to realize hot water circulation. And the outer wall of the water bath cavity is adhered with a heat-insulating material. Specifically, 4 water injection ports and 4 water outlets are arranged to perform hot water circulation and realize a constant temperature effect. Further realize the heat preservation effect of water bath cavity through insulation material, improve heat utilization efficiency.
The temperature control device 5 comprises a thermocouple temperature sensor which is arranged in the tank body to detect the temperature of the reaction slurry and arranged in the hot water tank to detect the temperature of the hot water so as to control the temperature of the hot water. The actual temperature and the hot water temperature of the slurry in the tank body are detected to control the hot water temperature, so that the temperature of the reaction slurry in the tank body is controlled to be uniform and constant.
Specifically, the upper portion intermediate position of the jar body is equipped with the feed inlet, top cap 1 is connected with the feed inlet. Wherein, the top cap adopts stainless steel to make, and the middle part is provided with transparent observation window. And a sealing ring and a screw locking assembly are arranged at the edge of the top cover. After the raw materials are put into the reactor, the top cover is locked through a plurality of screw locking assemblies, the sealing state is achieved through the sealing rings, and the transparent observation window is made of the acrylic plate in the middle of the top cover, so that the reaction process can be observed conveniently.
In this embodiment, the discharging device 6 includes a discharging pipe connected to the discharging opening, a discharging valve, and a discharging pump. And after the processing is finished, opening the discharge valve and the discharge pump, and quickly unloading the slurry through the discharge pipeline.
In this embodiment, the driving device 7 includes a variable frequency ac motor and a belt transmission assembly, and the belt transmission assembly connects the variable frequency ac motor and the impeller device. The synchronous belt is driven to transmit through the rotation of the variable frequency alternating current motor, so that the impeller device is driven to run.
In addition, a working platform 8 is further arranged and comprises an anti-skid threaded stainless steel plate with the thickness of 5mm, a guardrail, a hanging ladder and the like, the threaded steel plate platform surrounds and is installed on the upper half part of the tank body and used for enabling a worker to stand during the production process, the guardrail is installed around the platform, and the ladder is installed on the ground and connected with the threaded steel plate platform and the guardrail and used for moving up and down the working platform. The frame is integrated into one piece machine-shaping, can be for welding or bolt concatenation or both combine to stabilize on the ground.
The system can refer to the prior art, and further comprises a control system 10, which is used for controlling the production and operation of the whole equipment, is composed of an electric appliance cabinet, a PLC control panel and the like, and is used for setting various production working parameters and carrying out equipment working control.
The top cover is opened, put into the jar body with conventional fibre paper pulp through the feed inlet, and add corresponding chemicals, and lock the top cover, set for corresponding operating parameter through control system's PLC, under the condition of thermostatic waterbath heating, drive arrangement drives impeller device and carries out continuous high-speed disintegration, the dispersion to fibre thick liquids, can observe whole course of working through transparent observation window in process of production, prepare into transparent paper pulp material after the reaction is accomplished, carry out transparent paper pulp through discharge apparatus and unload, utilize clear water to carry out self-cleaning to equipment through belt cleaning device after unloading is accomplished.
In the preparation method of the transparent emulsion adopted in the step S4, the raw materials comprise the following components in parts by mass:
preferably, the aqueous transparent resin is one or more of aqueous acrylic resin, aqueous polyurethane resin, aqueous epoxy resin and polyvinyl alcohol; the transparent cross-linking agent is one or more of aziridine, polyethylenimine, polycarbodiimide, carbodiimide, water-based isocyanate, pyridine, water-based amino resin and polyethyleneimine cross-linking agent; the transparent softening agent is one or more of SME-4, polyoxyethylene, organosilicon quaternary ammonium salt and polyethylene wax; the defoaming agent is a special defoaming agent for fatty alcohol papermaking.
The raw material components are weighed according to the formula proportion, the solid content of the raw material components is 20-45%, and then the raw material components are subjected to shear emulsification for 15-30 minutes by adopting a shear emulsifying machine at the rotating speed of 8000-20000 revolutions per minute to form uniform transparent emulsion.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The preparation method of the transparent paper for printing and packaging comprises the following steps:
and (3) crushing the prepared bleached needle-leaved pulp dry pulp board by using a crusher, and weighing 50KG for later use.
Weighing a liquid cationic etherifying agent CHPTAC 12 KG; 402KG of ethanol; 13.6KG of caustic soda; 13.6KG of 3-chloro-2-hydroxypropanesulfonic acid sodium salt is used.
As shown in fig. 1 and 2, a top cover of a special counter-rotating type transparent paper pulp production device is opened, weighed bleaching needle pulp is put into a tank body through a feed inlet, corresponding chemicals are added, the top cover is locked, a constant temperature water bath heating temperature of 65 ℃ is set through a PLC (programmable logic controller) of a control system, the vehicle speed is 1500 rpm, a device driving device drives an impeller device to carry out high-speed disintegration, dispersion and chemical reaction on the pulp for 3 hours, and the whole processing process can be observed through a transparent observation window of the device in the production process.
And continuously pouring the reacted slurry into a screw extruder, setting the rotating speed to be 30 r/min for extrusion treatment, extracting the extruded solid material for later use, and recycling the extruded liquid.
And pouring the solid material obtained after extrusion into a stainless steel material transferring barrel, and adding 100KG of tertiary filtered clear water to fully dissolve the solid material.
Continuously pouring the dissolved substances into a centrifuge, setting the rotating speed n of a rotary drum to be 2000 r/min, setting the differential rotating speed delta n of the rotary drum and a screw to be 10 r/min, carrying out centrifugal treatment on the rotary drum and the screw at the differential rotating speed of 10 r/min, extracting solid materials after the centrifugal treatment for later use, and recycling liquid.
And pouring the solid slurry obtained after the centrifugal treatment into a stainless steel material transferring barrel for later use.
Weighing 10KG of waterborne acrylic resin; 1KG aqueous amino resin; organosilicon quaternary ammonium salt 1 KG; surso l VL0.5KG; carrying out three-stage filtration on clear water of 8 KG; defoaming agent PA-125 1G; and the materials are subjected to shearing emulsification for 15 minutes at the speed of 10000 r/min by a shearing emulsifying machine to prepare transparent emulsion with the solid content of about 30 percent.
And pouring the prepared transparent emulsion into a stainless steel material transferring barrel, and fully mixing and uniformly stirring the transparent emulsion and the solid slurry after centrifugal treatment to prepare the transparent slurry.
And (2) adopting the existing paper making process, adding a sizing agent, a retention aid, a moisture regulator and the like into the prepared transparent pulp again to prepare pulp before making paper, and adopting a fourdrinier machine to make paper, wherein the pressure of shoe press and soft press polish treatment is 1.5Mpa, so as to obtain the transparent paper.
The prepared transparent paper can be prepared into various wrapping papers, such as cigarette wrapping paper, through subsequent printing, and the gram weight of the transparent paper is 180g/m2The transparency was 82.3%, and the performance was good.
By adopting the technical scheme, the invention has the following beneficial effects:
1. compared with the prior methods such as a nano-cellulose method (requiring nano-fiber preparation, high-pressure homogenization treatment and the like, and incapable of realizing industrial mass production), an impregnation method (general transparency effect) and the like, the method disclosed by the invention realizes industrial mass production by chemically modifying paper pulp fibers, adopting special equipment and combining the conventional papermaking equipment, has the superior performances such as high production speed and high efficiency, has the excellent advantages of industrial large-scale and batch production, and realizes industrial mass production of the transparent paper.
2. The invention solves the problem of VOCs pollution in the production process of other methods such as a vulcanization process, an impregnation process and the like, the fiber modifier can be reused in the invention after being extruded and filtered in the whole production process, and the transparent emulsion is prepared from the water-based environment-friendly material, so the invention has no pollution, harm and the like of VOCs substances of a hazardous organic solvent, and really realizes the environment-friendly production.
3. The invention also provides special counter-rotating pulping equipment, realizes the production of the transparent paper by the special production equipment, and solves the problems of multiple processes, long flow, time and labor waste, low production efficiency, high waste product, high energy consumption and the like of other methods such as a nano-cellulose method and the like.
4. The transparent emulsion of the invention plays a role in crosslinking, and fills gaps of paper fibers, so that overpressure light treatment with too large pressure is not needed during production, and the effect of a softening agent in the transparent emulsion is added, so that the defects of easy deformation, hardness, brittleness and the like of the conventional transparent paper are comprehensively solved, the prepared product has certain flexibility, stiffness, bulk and the like, the printing adaptability and the forming processing adaptability of the product are excellent, and the product can be widely prepared into a printing packaging product.
Other embodiments of the present invention than the preferred embodiments described above, and those skilled in the art can make various changes and modifications according to the present invention without departing from the spirit of the present invention, should fall within the scope of the present invention defined in the claims.
Claims (10)
1. A preparation method of transparent paper for printing and packaging is characterized by comprising the following steps:
step S1: mixing crushed pulp prepared by crushing plant fiber wood pulp and a fiber modifier, and adding the mixture into counter-rotating pulping equipment for fiber modification chemical reaction;
the contra-rotating pulping equipment comprises a rack, a tank body and a driving device, wherein the tank body and the driving device are arranged on the rack, two impeller devices are arranged in the tank body, the driving device drives the two impeller devices to rotate in opposite directions, and the slurry in the tank body is continuously dispersed and forms colliding vortexes through the rotation of the two impeller devices in opposite directions; the tank body is provided with a constant-temperature heating device for heating the slurry at constant temperature, and the constant-temperature heating device is controlled by a temperature control device;
step S2: extruding the material obtained in the step S1 by adopting an extruding device, and extracting the extruded solid material for later use;
step S3: fully dissolving the solid material obtained in the step S2 by using clear water;
step S4: filtering the dissolved substance obtained in the step S3 by using filtering equipment again for standby;
step S5: adding the transparent emulsion into the solid slurry obtained in the step S4, dissolving and uniformly mixing to prepare transparent slurry;
step S6: the paper making aid is added again to the transparent paste prepared in step S5, and paper making is performed.
2. The method for preparing a transparent paper for printing package according to claim 1, wherein: the fiber modifier comprises an etherifying agent, alcohols and an auxiliary agent, wherein the etherifying agent is one or more of a solid cationic etherifying agent, a liquid cationic etherifying agent, cationic monomer dimethyl diallyl ammonium chloride, a high-retention cationic etherifying agent and a non-gelatinization starch cationic etherifying agent; the alcohol is one or more of ethanol, isopropanol and n-butanol; the auxiliary agent is one or more of azacyclo-carbene, 1-chlorine-2-hydroxy-propane-3-sulfonic acid sodium, 8-diazabicyclo [5.4.0] undec-7-ene, caustic soda, sodium carbonate and 3-chlorine-2-hydroxy propane sulfonic acid sodium salt.
3. The method for preparing a transparent paper for printing package according to claim 2, wherein: the etherifying agent, the alcohols and the auxiliary agent are mixed according to the mass ratio of 1: 10: 4-1: 25: 6, the preparation is carried out.
4. The method for preparing a transparent paper for printing package according to claim 1, wherein: in step S6, a shoe press is used in the paper press process, and a soft calendering or a metal belt calendering is used.
5. The method for preparing a transparent paper for printing package according to claim 1, wherein: the extrusion equipment in the step S2 is spiral extrusion equipment; the draining device in the step S4 is a horizontal centrifuge.
6. The method for preparing a transparent paper for printing package according to claim 1, wherein: the adding proportion of the solid slurry and the transparent emulsion in the step S5 is solid slurry according to the solid content: clear emulsion 1: 0.05 to 0.15.
7. The method for preparing a transparent paper for printing package according to claim 6, wherein: the transparent emulsion comprises the following raw materials in parts by mass:
8. the method for preparing a transparent paper for printing package according to claim 7, wherein: the waterborne transparent resin is one or more of waterborne acrylic resin, waterborne polyurethane resin, waterborne epoxy resin and polyvinyl alcohol; the transparent cross-linking agent is one or more of aziridine, polyethylenimine, polycarbodiimide, carbodiimide, water-based isocyanate, pyridine, water-based amino resin and polyethyleneimine cross-linking agent; the transparent softening agent is one or more of SME-4, polyoxyethylene, organosilicon quaternary ammonium salt and polyethylene wax; the defoaming agent is a special defoaming agent for fatty alcohol papermaking.
9. The method for preparing a transparent paper for printing package according to claim 8, wherein: mixing the raw materials of the transparent emulsion, adding clear water, controlling the solid content to be 20-45%, and then carrying out shearing emulsification for 15-30 minutes by adopting a shearing emulsifying machine at the rotating speed of 8000-20000 revolutions per minute to form uniform transparent emulsion.
10. A printing is cellophane for packing, its characterized in that: the transparent paper for printing and packaging is prepared by the preparation method of the transparent paper for printing and packaging as claimed in any one of claims 1 to 9.
Priority Applications (1)
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