Electronic paper carrier tape body paper and surface sizing production method thereof

Abstract

The invention provides electronic paper carrier tape body paper and a surface sizing production method thereof, and relates to the field of carrier tape body paper. The surface sizing production method of the electronic paper carrier tape body paper comprises the following steps of slurry treatment, internal sizing, forming, primary press polish, surface sizing and secondary press polish. According to the electronic paper carrier tape body paper and the surface sizing production method thereof, the phenomenon that the electronic paper carrier tape body paper is prone to layering after being repeatedly wound for multiple times in subsequent processing and downstream use can be effectively solved, and the bonding strength between the layers of the body paper is effectively improved; the bonding matching property of the electronic paper carrier tape body paper and the hot-melting upper cover tape is optimized, and the possible galling or layering phenomenon in the process of stripping the hot-melting upper cover tape is avoided; the stripping stability is further improved, the stripping force fluctuation is reduced, the abrupt change of the stripping force is avoided, the accurate and stable control on the stripping force is realized, the range of the stripping force is effectively reduced, and the use performance of the electronic paper carrier tape body paper is further improved.

Description

Technical Field

[0001] The invention relates to the field of carrier paper, and in particular to an electronic paper carrier paper and a surface sizing production method thereof. Background Art

[0002] The global shipment structure of multilayer ceramic capacitor MLCC products is gradually concentrated towards miniaturization, which simultaneously requires the size of the cavity that carries the electronic components in the carrier paper to be gradually miniaturized, and the requirements for the electronic paper carrier base paper are also getting higher and higher. Among them, the product performance of the electronic paper carrier base paper has a great influence on the surface mounting effect of electronic components; and the production method of the electronic carrier base paper is complex, and it is necessary to master a number of key technologies. Due to the uneven forming and thickness of the base paper in the later processing of the electronic paper carrier base paper, it will affect the punching quality and downstream use effect. Therefore, in the preparation process of the electronic paper carrier base paper, it is necessary to strictly control the longitudinal and transverse thickness and quantitative deviation of the base paper, and its surface finishing requirements are high.

[0003] In current electronic paper carrier paper, in a high temperature and high humidity environment, or when the temperature and humidity are poorly controlled, the expansion and contraction of the hole size after punching will lead to material jamming quality accidents in the subsequent tape weaving process. The inventor has verified that in the preparation process of electronic paper carrier paper, when the sizing degree in the pulp meets Cobb≤30g / m 2 When the thickness is reduced, the expansion rate can be kept at ≤1.5% under harsh temperature and humidity conditions.

[0004] Existing electronic paper carrier base paper usually contains a 3-layer (or more than 3-layer) structure, generally a surface layer, a middle core layer and a bottom layer. Positioning holes and cavities are evenly distributed on the carrier. The cavity is used to hold electronic components and seal the electronic components into the carrier through the upper and lower cover tapes. The electronic paper carrier base paper is generally cut into 8mm paper tapes during use, but it is easy to have paper tape delamination after repeated winding in subsequent processing and downstream use. Measures need to be taken in the production method of the electronic paper carrier base paper to ensure the bonding strength between the layers.

[0005] At the same time, the existing electronic paper carrier base paper also has the problem of poor bonding matching with its hot-melt cover tape. Specifically: during the downstream use process, the surface of the electronic paper carrier base paper needs to be attached to the hot-melt cover tape at high temperature for packaging. When it is subsequently unsealed and used, the hot-melt cover tape needs to be lifted at a certain angle and the peeling force needs to be kept within a predetermined range. On the one hand, in order to prevent the electronic components encapsulated in the electronic carrier paper from falling out, the upper and lower cover tapes are required to be firmly bonded to the surface of the electronic paper carrier base paper; on the other hand, the bonding force between the electronic paper carrier base paper and the hot-melt cover tape cannot be too large, otherwise the cover tape will not be smooth when it is lifted, and it is easy to pull up hair or base paper fibers, and even the electronic paper carrier base paper will be delaminated, which directly affects the normal use of electronic components.

[0006] In order to improve the bonding matching between the electronic paper carrier base paper and the hot-melt cover tape and optimize its peeling performance, although the prior art discloses a technical solution for preparing the electronic paper carrier base paper by using a specific surface sizing agent, there are problems such as poor peeling stability, large peeling force fluctuation, and sudden change in peeling force during the peeling process of the hot-melt cover tape, and it is impossible to achieve accurate and stable control of the peeling force and effectively reduce the extreme difference in peeling force. The poor peeling force stability, large peeling force fluctuation, and great peeling force extreme difference directly lead to the carrier paper shaking phenomenon during the peeling process of the hot-melt cover tape, which is easy to cause the electronic components packaged therein to fall off, and the actual use performance of the carrier paper is not ideal. Summary of the invention

[0007] In order to solve the technical problems existing in the prior art, the present invention provides an electronic paper carrier base paper and a surface sizing production method thereof, which can effectively solve the problem that the electronic paper carrier base paper is prone to paper tape delamination after being repeatedly wound multiple times in subsequent processing and downstream use, effectively improve the bonding strength between the base paper layers, and optimize the bonding matching between the electronic paper carrier base paper and its hot-melt cover tape, avoiding possible pulling or delamination during the peeling process of the hot-melt cover tape; and further improve the peeling stability, reduce the peeling force fluctuation, avoid the sudden change of the peeling force, realize the precise and stable control of the peeling force, effectively reduce the extreme difference of the peeling force, and further improve the use performance of the electronic paper carrier base paper.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: A surface sizing production method for electronic paper carrier base paper, comprising the following steps: slurry treatment, internal sizing, molding, primary calendering, surface sizing, secondary calendering; The pulp treatment method comprises beating chemical coniferous pulp, chemical hardwood pulp and recycled pulp respectively to obtain refined chemical coniferous pulp, refined chemical hardwood pulp and refined recycled pulp; The refined chemical coniferous pulp and the refined chemical hardwood pulp are mixed evenly to obtain the surface layer pulp; the refined chemical coniferous pulp, the refined chemical hardwood pulp and the refined recycled pulp are mixed evenly to obtain the core layer pulp; the refined chemical coniferous pulp and the refined chemical hardwood pulp are mixed evenly to obtain the bottom layer pulp; the surface layer pulp, the core layer pulp and the bottom layer pulp are sizing-applied in the pulp, the mesh part is formed and compounded into one body, and then pre-dried to obtain the composite base paper; The composite base paper is calendered once, then surface sized with a surface sizing agent, and then calendered twice to obtain an electronic paper carrier base paper; The surface sizing agent is composed of the following raw materials in parts by weight: 35-40 parts of polyvinyl alcohol, 20-25 parts of resistant modified starch, 20-25 parts of vinyl acetate, 12.8-13.8 parts of dry strength agent, 0.1-0.2 parts of bactericide, 0.5-1 parts of lubricant, 0.1-0.2 parts of defoamer and 0.5-0.6 parts of water repellent.

[0009] Preferably, in the pulp treatment, the beating degree of refined chemical coniferous pulp is 45-50°SR, and the average fiber length is 0.6-1mm; the beating degree of refined chemical hardwood pulp is 45-50°SR, and the average fiber length is 0.5-0.8mm; the beating degree of refined recycled pulp is 40-45°SR, and the average fiber length is 0.5-0.7mm.

[0010] Preferably, in the pulp treatment, the beating concentration of the chemical coniferous pulp is controlled to be 3.5-4.0wt%, the beating power is 750-770kw, and the beating temperature is 31-33°C; The chemical hardwood pulp concentration is controlled to be 3.5-4.0wt%, the pulping power is 770-800kw, and the pulping temperature is 33-35℃; The pulping concentration of the recycled pulp is controlled to be 3.5-4.0wt%, the pulping power is 320-360kw, and the pulping temperature is 35-38℃.

[0011] Preferably, in the surface layer pulp, the weight ratio of refined chemical coniferous pulp and refined chemical broadleaf pulp is 20-50:50-80; in the core layer pulp, the weight ratio of refined chemical coniferous pulp, refined chemical broadleaf pulp and refined recycled pulp is 5-30:5-40:30-50; in the bottom layer pulp, the weight ratio of refined chemical coniferous pulp and refined chemical broadleaf pulp is 10-40:60-90.

[0012] Furthermore, the sizing in the slurry is performed by using a composite water-proof and moisture-proof agent; the composite water-proof and moisture-proof agent is a compound of wet strength agent PAE, alkyl ketene dimer AKD, organosilicon waterproofing agent, and ammonium zirconium carbonate; Preferably, in the slurry sizing, the weight of the wet strength agent PAE in the composite water-proof and moisture-proof agent is controlled to be 0.085-0.115% of the total absolute dry weight of the slurry, the weight of the alkyl ketene dimer AKD is controlled to be 0.35-0.45% of the total absolute dry weight of the slurry, the weight of the silicone waterproofing agent is controlled to be 0.09-0.11% of the total absolute dry weight of the slurry, and the weight of ammonium zirconium carbonate is controlled to be 0.03-0.06% of the total absolute dry weight of the slurry.

[0013] Preferably, the weight of the surface layer of the composite base paper accounts for 20-25wt%, the weight of the core layer accounts for 50-55wt%, and the weight of the bottom layer accounts for 20-25wt%; The composite base paper has a moisture content of 6-8wt% and a basis weight of 250-900g / m 2 .

[0014] Furthermore, the surface sizing method is to use a surface sizing agent to perform surface sizing on the upper and lower surfaces of the composite base paper after the first calendering, control the surface sizing pressure to be 30-33 KN / m, the surface sizing temperature to be 40-45°C, the surface sizing speed to be 115-125 m / min, and the single-side sizing amount of the surface sizing to be 3.6-4.2 g / m 2 .

[0015] Furthermore, in the surface sizing agent, the modification-resistant starch is oxidized corn starch; The dry strength agent is composed of polyacrylamide and guar gum, and the weight ratio of polyacrylamide to guar gum is 1.8-2:1; The lubricant is calcium stearate or polyethylene wax; The defoamer is one of the following: fatty acid defoamer, modified polysiloxane defoamer, hydrophobic silica; The water repellent is one of the following: glyoxal, polyamide polyurea high molecular oligomer, potassium zirconium carbonate.

[0016] Preferably, in the one calendering, the line pressure of the calender is controlled to be 100-105 kN / m, and the hot oil temperature of the calender is 100-150° C.; In the secondary calendering, the line pressure of the calender is controlled to be 100-105 kN / m, and the hot oil temperature of the calender is controlled to be 100-150°C.

[0017] An electronic paper carrier base paper produced by the above production method.

[0018] Compared with the prior art, the present invention has the following beneficial effects: (1) The surface sizing production method of the electronic paper carrier base paper of the present invention is to selectively select a pulp combination of chemical coniferous wood pulp and chemical hardwood pulp as the main material and recycled pulp as the auxiliary material, and prepare the surface layer pulp, core layer pulp and bottom layer pulp by mixing them. After the pulp is sizing, sizing and net forming, a specific drying temperature curve is used for multi-cylinder drying. Then, the surface sizing agent with a specific raw material composition and ratio is used in combination with a primary calendering process and a secondary calendering process, and the surface sizing agent is used in combination with specific surface sizing process parameters. Starting from the control of the degree of surface sizing coating, the surface absorbency and sizing pressure of the surface sizing agent are adjusted to control the surface sizing agent. Penetration and covering and filling the paper surface; the aforementioned technical means cooperate with each other and work synergistically to effectively solve the problem of paper tape delamination after repeated winding of the electronic paper carrier base paper in subsequent processing and downstream use, effectively improve the bonding strength between the layers of the base paper, and optimize the bonding matching between the electronic paper carrier base paper and its hot-melt cover tape, avoiding possible pulling or delamination during the peeling process of the hot-melt cover tape; and further improve the peeling stability, reduce the peeling force fluctuation, avoid the sudden change of peeling force, realize the precise and stable control of the peeling force, effectively reduce the extreme difference of the peeling force, and further improve the performance of the electronic paper carrier base paper.

[0019] (2) The electronic paper carrier base paper of the present invention has an internal bonding strength of ≥375 J / m 2 , surface water absorption ≤29g / m 2 The surface strength (wax stick test method) can reach 23A. The average tensile force of the hot-melt cover tape after heat sealing is 18.3-25.6gf, which effectively keeps the peeling force range within 21-24.5gf. At the same time, Cobb (120s) is 26-29g / m 2 Compared with the traditional process, the mechanical properties of the electronic paper carrier base paper have been significantly improved, especially in terms of surface strength and peeling force. At the same time, when the hot-melt cover tape is released from the surface of the paper carrier after heat sealing, its peeling force is stable and there is no surface pulling phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The present invention is a schematic flow chart of the surface sizing production method of the electronic paper carrier base paper of the present invention. DETAILED DESCRIPTION

[0021] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention are now described. It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those of ordinary skill in the art to which the present invention belongs.

[0022] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, "first", "second", etc. are used to distinguish similar objects, and are not used to describe a specific order or sequence. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0023] like Figure 1 As shown, a surface sizing production method for electronic paper carrier base paper provided by an embodiment of the present invention includes the following steps: slurry treatment, internal sizing, molding, primary calendering, surface sizing, and secondary calendering.

[0024] The pulp treatment method is to select chemical coniferous pulp and chemical broadleaf pulp as the main materials and recycled pulp as the auxiliary materials, and beat them separately to obtain refined chemical coniferous pulp with a beating degree of 45-50°SR and an average fiber length of 0.6-1mm; refined chemical broadleaf pulp with a beating degree of 45-50°SR and an average fiber length of 0.5-0.8mm; and refined recycled pulp with a beating degree of 40-45°SR and an average fiber length of 0.5-0.7mm.

[0025] In the pulp treatment, during the pulping process of chemical coniferous pulp, the pulping concentration is controlled at 3.5-4.0wt%, the pulping power is 750-770kw, and the pulping temperature is 31-33°C; during the pulping process of chemical broadleaf pulp, the pulping concentration is controlled at 3.5-4.0wt%, the pulping power is 770-800kw, and the pulping temperature is 33-35°C; during the pulping process of recycled pulp, the pulping concentration is controlled at 3.5-4.0wt%, the pulping power is 320-360kw, and the pulping temperature is 35-38°C.

[0026] In the pulp treatment, a pulp combination of chemical coniferous wood pulp and chemical broadleaf wood pulp as the main materials and recycled pulp as the auxiliary materials is selected in a targeted manner, and pulping treatment is performed under specific process parameter conditions to obtain refined pulps of specific specifications, thereby ensuring the binding ability, water filtration ability and other properties of the refined pulp fibers, thereby specifically improving the internal bonding strength of the electronic paper carrier base paper while ensuring the mechanical properties of the electronic paper carrier base paper.

[0027] The method for internal sizing is as follows: in a batching tank, evenly mix refined chemical coniferous pulp and refined chemical broadleaf pulp at a weight ratio of 20-50:50-80 to obtain a surface layer pulp; evenly mix refined chemical coniferous pulp, refined chemical broadleaf pulp and refined recycled pulp at a weight ratio of 5-30:5-40:30-50 to obtain a core layer pulp; evenly mix refined chemical coniferous pulp and refined chemical broadleaf pulp at a weight ratio of 10-40:60-90 to obtain a bottom layer pulp; and respectively pump the surface layer pulp, the core layer pulp and the bottom layer pulp into a pulping tank to add a composite water-resistant and moisture-proof agent to obtain a surface layer pulp after internal sizing, a core layer pulp after internal sizing and a bottom layer pulp after internal sizing.

[0028] In the slurry sizing, the composite water-proof and moisture-proof agent is a compound of wet strength agent PAE, alkyl ketene dimer AKD, silicone waterproofing agent and ammonium zirconium carbonate; and the added weight of wet strength agent PAE in the composite water-proof and moisture-proof agent is controlled to be 0.085-0.115% of the total absolute dry weight of each slurry, the added weight of alkyl ketene dimer AKD is 0.35-0.45% of the total absolute dry weight of each slurry, the added weight of silicone waterproofing agent is 0.09-0.11% of the total absolute dry weight of each slurry, and the added weight of ammonium zirconium carbonate is 0.03-0.06% of the total absolute dry weight of each slurry.

[0029] In the internal sizing, a high proportion of refined chemical broadleaf pulp and a low proportion of refined chemical coniferous pulp are selected as the surface layer pulp and the bottom layer pulp; a specific proportion of refined chemical coniferous pulp, refined chemical broadleaf pulp and refined recycled pulp are selected as the core layer pulp, and a composite water-resistant and moisture-proof agent is used for internal sizing, so as to improve the internal bonding strength of the electronic paper carrier base paper in a targeted manner, effectively solve the problem of paper tape delamination after the electronic paper carrier base paper is repeatedly wound for many times in subsequent processing and downstream use, effectively improve the internal bonding strength between the base paper layers, and optimize the bonding matching between the electronic paper carrier base paper and its hot-melt cover tape.

[0030] The forming method comprises the following steps: sizing and mesh forming (multi-mesh forming) of the surface layer slurry after internal sizing, the core layer slurry after internal sizing, and the bottom layer slurry after internal sizing, and after the surface layer, the core layer and the bottom layer are composited into one body, and then pre-dried until the moisture content of the base paper is 6-8wt%, so as to obtain a composite base paper with a surface layer weight proportion of 20-25wt%, a core layer weight proportion of 50-55wt%, and a bottom layer weight proportion of 20-25wt%.

[0031] During the forming process, the basis weight of the composite base paper is controlled to be 250-900 g / m 2 ; preferably 300-500g / m 2 .

[0032] In the pre-drying, multiple drying cylinders are used for drying, and the drying process is controlled to be divided into low-temperature drying, medium-high temperature drying, high-temperature drying, and medium-low temperature drying processes. The specific drying temperature curve is low-temperature drying (33-38°C), medium-high temperature drying (82-87°C), high-temperature drying (108-113°C), and medium-low temperature drying (68-73°C).

[0033] In the forming process, the pulp after internal sizing is compounded by multi-net papermaking, and the surface layer, core layer and bottom layer are compounded into one body, which effectively improves the uniformity of base paper thickness, controls the quantitative range of base paper, and further improves the internal bonding strength between the layers of base paper; then, multiple drying cylinders are used for pre-drying, and through a specific drying temperature curve, the base paper moisture is controlled as a whole through low-temperature drying, medium-high temperature drying, high-temperature drying, and medium-low temperature drying processes, which is beneficial to the subsequent one-time calendering and surface sizing.

[0034] The one-time calendering method is to perform one-time calendering treatment on the composite base paper, control the line pressure of the calendering machine for the one-time calendering to be 100-105 kN / m, and the hot oil temperature of the calendering machine to be 100-150° C., so as to obtain the composite base paper after one-time calendering.

[0035] In the one-time calendering, the formed paper is calendered to improve its flatness and thickness consistency, optimize the bonding matching between the electronic paper carrier base paper and its hot-melt cover tape, and improve the peeling stability during use.

[0036] The surface sizing method comprises the following steps: applying surface sizing agent to the upper and lower surfaces of the composite base paper after the first calendering, controlling the surface sizing pressure to be 30-33 KN / m, the surface sizing temperature to be 40-45° C., the surface sizing speed to be 115-125 m / min, and the single-side sizing amount to be 3.6-4.2 g / m 2 , and obtain the composite base paper after surface sizing.

[0037] In the surface sizing, the surface sizing agent is composed of the following raw materials in parts by weight: 35-40 parts of polyvinyl alcohol, 20-25 parts of resistant modified starch, 20-25 parts of vinyl acetate, 12.8-13.8 parts of dry strength agent, 0.1-0.2 parts of bactericide, 0.5-1 parts of lubricant, 0.1-0.2 parts of defoamer and 0.5-0.6 parts of water repellent.

[0038] In the surface sizing, the anti-modification starch is corn oxidized starch. The dry strength agent is composed of polyacrylamide and guar gum, and the weight ratio of polyacrylamide to guar gum is 1.8-2:1. The lubricant is calcium stearate or polyethylene wax. The defoamer is one of the following: fatty acid defoamer, modified polysiloxane defoamer, hydrophobic silica. The water repellent is one of the following: glyoxal, polyamide polyurea high molecular oligomer, potassium zirconium carbonate. The bactericide is one of the following: organic sulfur bactericide, organic bromine bactericide, nitrogen-containing heterocyclic compound bactericide.

[0039] In the surface sizing, a surface sizing agent with a specific raw material composition and ratio is used, and specific surface sizing process parameters are matched. Starting from the control of the surface sizing coating degree, the surface absorbency and sizing pressure are adjusted to control the penetration of the surface sizing agent and the covering and filling of the paper surface, so as to further optimize the bonding matching between the electronic paper carrier base paper and its hot-melt cover tape, avoid possible pulling or delamination during the peeling process of the hot-melt cover tape; and further improve the peeling stability, reduce the peeling force fluctuation, avoid the sudden change of the peeling force, realize the precise and stable control of the peeling force, and effectively keep the peeling force range within the range of 21-24.5gf.

[0040] The secondary calendering method is to perform secondary calendering on the composite base paper after surface sizing, control the line pressure of the calendering machine for secondary calendering to be 100-105 kN / m, the hot oil temperature of the calendering machine to be 100-150° C., and then curl and cut to obtain the electronic paper carrier base paper.

[0041] In the secondary calendering, the composite base paper after surface sizing is subjected to secondary calendering treatment to further improve the overall quality of the electronic paper carrier base paper.

[0042] The embodiment of the present invention also provides an electronic paper carrier base paper prepared by the above method.

[0043] The present invention is further described below in conjunction with some specific embodiments.

[0044] Example 1 This embodiment provides a method for producing a surface sizing of an electronic paper carrier base paper, comprising the following steps: 1. Slurry treatment Chemical coniferous pulp, chemical broadleaf pulp and recycled pulp were beaten respectively to obtain refined chemical coniferous pulp with a beating degree of 45°SR and an average fiber length of 0.9 mm; refined chemical broadleaf pulp with a beating degree of 45°SR and an average fiber length of 0.7 mm; and refined recycled pulp with a beating degree of 40°SR and an average fiber length of 0.5 mm.

[0045] During the pulping process of chemical coniferous pulp, the pulping concentration was controlled at 3.6wt%, the pulping power was 750kw, and the pulping temperature was 32°C.

[0046] During the pulping process of chemical hardwood pulp, the pulping concentration was controlled at 3.6wt%, the pulping power was 770kw, and the pulping temperature was 34°C.

[0047] During the pulping process of the recycled pulp, the pulping concentration was controlled at 3.6wt%, the pulping power was 320kw, and the pulping temperature was 37°C.

[0048] 2. Sizing in pulp In the batching tank, the refined chemical coniferous pulp and the refined chemical broadleaf pulp are evenly mixed in a weight ratio of 30:70 to obtain the surface layer pulp; the refined chemical coniferous pulp, the refined chemical broadleaf pulp and the refined recovered pulp are evenly mixed in a weight ratio of 15:35:50 to obtain the core layer pulp; the refined chemical coniferous pulp and the refined chemical broadleaf pulp are evenly mixed in a weight ratio of 30:70 to obtain the bottom layer pulp; the surface layer pulp, the core layer pulp and the bottom layer pulp are respectively pumped into the pulping tank to add the composite water-proof and moisture-proof agent to obtain the surface layer pulp after internal sizing, the core layer pulp after internal sizing and the bottom layer pulp after internal sizing.

[0049] Among them, the composite water-proof and moisture-proof agent is a compound of wet strength agent PAE, alkyl ketene dimer AKD, silicone waterproofing agent and ammonium zirconium carbonate; and the added weight of wet strength agent PAE in the composite water-proof and moisture-proof agent is controlled to be 0.1% of the total absolute dry weight of each slurry, the added weight of alkyl ketene dimer AKD is 0.4% of the total absolute dry weight of each slurry, the added weight of silicone waterproofing agent is 0.1% of the total absolute dry weight of each slurry, and the added weight of ammonium zirconium carbonate is 0.04% of the total absolute dry weight of each slurry.

[0050] 3. Molding The surface layer pulp after internal sizing, the core layer pulp after internal sizing, and the bottom layer pulp after internal sizing are sizing and mesh forming (multi-mesh forming). The surface layer, core layer and bottom layer are composited into one body and then pre-dried until the moisture content of the base paper is 7.5wt%, to obtain a composite base paper with a surface layer weight proportion of 25wt%, a core layer weight proportion of 50wt%, and a bottom layer weight proportion of 25wt%.

[0051] Among them, the weight of the composite base paper is controlled to be 380g / m 2 .

[0052] In the pre-drying, multiple drying cylinders are used to dry the fabric. The drying process is controlled to be divided into low-temperature drying, medium-high temperature drying, high-temperature drying, and medium-low temperature drying processes. The specific drying temperature curve is low-temperature drying (35°C), medium-high temperature drying (85°C), high-temperature drying (110°C), and medium-low temperature drying (70°C).

[0053] 4. One-time calendering The composite base paper is subjected to a calendering treatment, the line pressure of the calendering machine is controlled to be 100 kN / m, and the hot oil temperature of the calendering machine is controlled to be 120° C., so as to obtain the composite base paper after the first calendering.

[0054] 5. Surface sizing The surface sizing agent was used to apply surface sizing to the upper and lower surfaces of the composite base paper after the first calendering. The surface sizing pressure was controlled to be 31KN / m, the surface sizing temperature was 42℃, the surface sizing speed was 120m / min, and the single-side sizing amount of the surface sizing was 3.8g / m 2 , and obtain the composite base paper after surface sizing.

[0055] The surface sizing agent is composed of the following raw materials in parts by weight: 35 parts of polyvinyl alcohol, 25 parts of resistant modified starch, 25 parts of vinyl acetate, 13.8 parts of dry strength agent, 0.1 parts of bactericide, 0.5 parts of lubricant, 0.1 parts of defoamer and 0.5 parts of water repellent.

[0056] The resistant starch is oxidized corn starch.

[0057] The dry strength agent is composed of polyacrylamide and guar gum, and the weight ratio of polyacrylamide to guar gum is 2:1.

[0058] The lubricant is calcium stearate.

[0059] The defoaming agent is a fatty acid defoaming agent.

[0060] The water repellent is a polyamide polyurea high molecular oligomer.

[0061] The fungicide is a nitrogen-containing heterocyclic compound fungicide.

[0062] 6. Second calendering The composite base paper after surface sizing is subjected to secondary calendering treatment, the line pressure of the calender of the secondary calendering is controlled to be 100 kN / m, the hot oil temperature of the calender is 120° C., and then the composite base paper is curled and slit to obtain the electronic paper carrier base paper.

[0063] This embodiment also provides an electronic paper carrier base paper prepared by the above method.

[0064] Example 2 The present embodiment provides a method for producing a surface sizing of an electronic paper carrier base paper, comprising the following steps: 1. Slurry treatment Chemical coniferous pulp, chemical broadleaf pulp and recycled pulp were beaten respectively to obtain refined chemical coniferous pulp with a beating degree of 45°SR and an average fiber length of 0.9 mm; refined chemical broadleaf pulp with a beating degree of 45°SR and an average fiber length of 0.7 mm; and refined recycled pulp with a beating degree of 40°SR and an average fiber length of 0.5 mm.

[0065] During the pulping process of chemical coniferous pulp, the pulping concentration was controlled at 3.6wt%, the pulping power was 750kw, and the pulping temperature was 32°C.

[0066] During the pulping process of chemical hardwood pulp, the pulping concentration was controlled at 3.6wt%, the pulping power was 770kw, and the pulping temperature was 34°C.

[0067] During the pulping process of the recycled pulp, the pulping concentration was controlled at 3.6wt%, the pulping power was 320kw, and the pulping temperature was 37°C.

[0068] 2. Sizing in pulp In the batching tank, the refined chemical coniferous pulp and the refined chemical broadleaf pulp are evenly mixed in a weight ratio of 30:70 to obtain the surface layer pulp; the refined chemical coniferous pulp, the refined chemical broadleaf pulp and the refined recovered pulp are evenly mixed in a weight ratio of 15:35:50 to obtain the core layer pulp; the refined chemical coniferous pulp and the refined chemical broadleaf pulp are evenly mixed in a weight ratio of 30:70 to obtain the bottom layer pulp; the surface layer pulp, the core layer pulp and the bottom layer pulp are respectively pumped into the pulping tank to add the composite water-proof and moisture-proof agent to obtain the surface layer pulp after internal sizing, the core layer pulp after internal sizing and the bottom layer pulp after internal sizing.

[0069] Among them, the composite water-proof and moisture-proof agent is a compound of wet strength agent PAE, alkyl ketene dimer AKD, silicone waterproofing agent and ammonium zirconium carbonate; and the added weight of wet strength agent PAE in the composite water-proof and moisture-proof agent is controlled to be 0.1% of the total absolute dry weight of each slurry, the added weight of alkyl ketene dimer AKD is 0.4% of the total absolute dry weight of each slurry, the added weight of silicone waterproofing agent is 0.1% of the total absolute dry weight of each slurry, and the added weight of ammonium zirconium carbonate is 0.04% of the total absolute dry weight of each slurry.

[0070] 3. Molding The surface layer pulp after internal sizing, the core layer pulp after internal sizing, and the bottom layer pulp after internal sizing are sizing and mesh forming (multi-mesh forming). The surface layer, core layer and bottom layer are composited into one body and then pre-dried until the moisture content of the base paper is 7.5wt%, to obtain a composite base paper with a surface layer weight proportion of 25wt%, a core layer weight proportion of 50wt%, and a bottom layer weight proportion of 25wt%.

[0071] Among them, the weight of the composite base paper is controlled to be 380g / m 2.

[0072] In the pre-drying, multiple drying cylinders are used to dry the fabric. The drying process is controlled to be low-temperature drying, medium-high temperature drying, high-temperature drying, and medium-low temperature drying. The specific drying temperature curve is low-temperature drying (33°C), medium-high temperature drying (82°C), high-temperature drying (108°C), and medium-low temperature drying (68°C).

[0073] 4. One-time calendering The composite base paper was subjected to a calendering treatment, the line pressure of the calendering machine was controlled to be 102 kN / m, the hot oil temperature of the calendering machine was controlled to be 100° C., and the composite base paper after the first calendering was obtained.

[0074] 5. Surface sizing The surface sizing agent is used to apply surface sizing to the upper and lower surfaces of the composite base paper after the first calendering. The surface sizing pressure is controlled to be 30KN / m, the surface sizing temperature is 40℃, the surface sizing speed is 115m / min, and the single-side sizing amount of the surface sizing is 3.8g / m 2 , and obtain the composite base paper after surface sizing.

[0075] The surface sizing agent is composed of the following raw materials in parts by weight: 35 parts of polyvinyl alcohol, 25 parts of resistant modified starch, 25 parts of vinyl acetate, 13.3 parts of dry strength agent, 0.1 parts of bactericide, 1 part of lubricant, 0.1 parts of defoamer and 0.5 parts of water repellent.

[0076] The resistant starch is oxidized corn starch.

[0077] The dry strength agent is composed of polyacrylamide and guar gum, and the weight ratio of polyacrylamide to guar gum is 2:1.

[0078] The lubricant is polyethylene wax.

[0079] The defoaming agent is a modified polysiloxane defoaming agent.

[0080] The water repellent is a polyamide polyurea high molecular oligomer.

[0081] The fungicide is a nitrogen-containing heterocyclic compound fungicide.

[0082] 6. Second calendering The composite base paper after surface sizing is subjected to secondary calendering treatment, the line pressure of the calender for secondary calendering is controlled to be 102 kN / m, the hot oil temperature of the calender is 100° C., and then the composite base paper is curled and slit to obtain the electronic paper carrier base paper.

[0083] This embodiment also provides an electronic paper carrier base paper prepared by the above method.

[0084] Example 3 The present embodiment provides a method for producing a surface sizing of an electronic paper carrier base paper, comprising the following steps: 1. Slurry treatment Chemical coniferous pulp, chemical broadleaf pulp and recycled pulp were beaten respectively to obtain refined chemical coniferous pulp with a beating degree of 45°SR and an average fiber length of 0.9 mm; refined chemical broadleaf pulp with a beating degree of 45°SR and an average fiber length of 0.7 mm; and refined recycled pulp with a beating degree of 40°SR and an average fiber length of 0.5 mm.

[0085] During the pulping process of chemical coniferous pulp, the pulping concentration was controlled at 3.6wt%, the pulping power was 750kw, and the pulping temperature was 32°C.

[0086] During the pulping process of chemical hardwood pulp, the pulping concentration was controlled at 3.6wt%, the pulping power was 770kw, and the pulping temperature was 34°C.

[0087] During the pulping process of the recycled pulp, the pulping concentration was controlled at 3.6wt%, the pulping power was 320kw, and the pulping temperature was 37°C.

[0088] 2. Sizing in pulp In the batching tank, the refined chemical coniferous pulp and the refined chemical broadleaf pulp are evenly mixed in a weight ratio of 30:70 to obtain the surface layer pulp; the refined chemical coniferous pulp, the refined chemical broadleaf pulp and the refined recovered pulp are evenly mixed in a weight ratio of 15:35:50 to obtain the core layer pulp; the refined chemical coniferous pulp and the refined chemical broadleaf pulp are evenly mixed in a weight ratio of 30:70 to obtain the bottom layer pulp; the surface layer pulp, the core layer pulp and the bottom layer pulp are respectively pumped into the pulping tank to add the composite water-proof and moisture-proof agent to obtain the surface layer pulp after internal sizing, the core layer pulp after internal sizing and the bottom layer pulp after internal sizing.

[0089] Among them, the composite water-proof and moisture-proof agent is a compound of wet strength agent PAE, alkyl ketene dimer AKD, silicone waterproofing agent and ammonium zirconium carbonate; and the added weight of wet strength agent PAE in the composite water-proof and moisture-proof agent is controlled to be 0.1% of the total absolute dry weight of each slurry, the added weight of alkyl ketene dimer AKD is 0.4% of the total absolute dry weight of each slurry, the added weight of silicone waterproofing agent is 0.1% of the total absolute dry weight of each slurry, and the added weight of ammonium zirconium carbonate is 0.04% of the total absolute dry weight of each slurry.

[0090] 3. Molding The surface layer pulp after internal sizing, the core layer pulp after internal sizing, and the bottom layer pulp after internal sizing are sizing and mesh forming (multi-mesh forming). The surface layer, core layer and bottom layer are composited into one body and then pre-dried until the moisture content of the base paper is 7.5wt%, to obtain a composite base paper with a surface layer weight proportion of 25wt%, a core layer weight proportion of 50wt%, and a bottom layer weight proportion of 25wt%.

[0091] Among them, the weight of the composite base paper is controlled to be 380g / m 2 .

[0092] In the pre-drying, multiple drying cylinders are used to dry the fabric. The drying process is controlled to be low-temperature drying, medium-high temperature drying, high-temperature drying, and medium-low temperature drying. The specific drying temperature curve is low-temperature drying (38°C), medium-high temperature drying (87°C), high-temperature drying (113°C), and medium-low temperature drying (73°C).

[0093] 4. One-time calendering The composite base paper was subjected to a calendering treatment, the line pressure of the calender during the first calendering was controlled to be 105 kN / m, the hot oil temperature of the calender was controlled to be 140° C., and the composite base paper after the first calendering was obtained.

[0094] 5. Surface sizing The surface sizing agent was used to apply surface sizing to the upper and lower surfaces of the composite base paper after the first calendering. The surface sizing pressure was controlled to be 33KN / m, the surface sizing temperature was 45℃, the surface sizing speed was 125m / min, and the single-side sizing amount of the surface sizing was 3.8g / m 2 , and obtain the composite base paper after surface sizing.

[0095] The surface sizing agent is composed of the following raw materials in parts by weight: 40 parts of polyvinyl alcohol, 20 parts of resistant modified starch, 25 parts of vinyl acetate, 13.8 parts of dry strength agent, 0.1 parts of bactericide, 0.5 parts of lubricant, 0.1 parts of defoamer and 0.5 parts of water repellent.

[0096] The resistant starch is oxidized corn starch.

[0097] The dry strength agent is composed of polyacrylamide and guar gum, and the weight ratio of polyacrylamide to guar gum is 2:1.

[0098] The lubricant is calcium stearate.

[0099] The defoaming agent is a fatty acid defoaming agent.

[0100] The water repellent is a polyamide polyurea high molecular oligomer.

[0101] The fungicide is a nitrogen-containing heterocyclic compound fungicide.

[0102] 6. Second calendering The composite base paper after surface sizing is subjected to secondary calendering treatment, the line pressure of the calender of the secondary calendering is controlled to be 105 kN / m, the hot oil temperature of the calender is 140° C., and then the composite base paper is curled and slit to obtain the electronic paper carrier base paper.

[0103] The embodiment of the present invention also provides an electronic paper carrier base paper prepared by the above method.

[0104] Example 4 The present embodiment provides a method for producing a surface sizing of an electronic paper carrier base paper, comprising the following steps: 1. Slurry treatment Chemical coniferous pulp, chemical broadleaf pulp and recycled pulp were beaten respectively to obtain refined chemical coniferous pulp with a beating degree of 45°SR and an average fiber length of 0.9 mm; refined chemical broadleaf pulp with a beating degree of 45°SR and an average fiber length of 0.7 mm; and refined recycled pulp with a beating degree of 40°SR and an average fiber length of 0.5 mm.

[0105] During the pulping process of chemical coniferous pulp, the pulping concentration was controlled at 3.6wt%, the pulping power was 750kw, and the pulping temperature was 32°C.

[0106] During the pulping process of chemical hardwood pulp, the pulping concentration was controlled at 3.6wt%, the pulping power was 770kw, and the pulping temperature was 34°C.

[0107] During the pulping process of the recycled pulp, the pulping concentration was controlled at 3.6wt%, the pulping power was 320kw, and the pulping temperature was 37°C.

[0108] 2. Sizing in pulp In the batching tank, the refined chemical coniferous pulp and the refined chemical broadleaf pulp are evenly mixed in a weight ratio of 30:70 to obtain the surface layer pulp; the refined chemical coniferous pulp, the refined chemical broadleaf pulp and the refined recovered pulp are evenly mixed in a weight ratio of 15:35:50 to obtain the core layer pulp; the refined chemical coniferous pulp and the refined chemical broadleaf pulp are evenly mixed in a weight ratio of 30:70 to obtain the bottom layer pulp; the surface layer pulp, the core layer pulp and the bottom layer pulp are respectively pumped into the pulping tank to add the composite water-proof and moisture-proof agent to obtain the surface layer pulp after internal sizing, the core layer pulp after internal sizing and the bottom layer pulp after internal sizing.

[0109] Among them, the composite water-proof and moisture-proof agent is a compound of wet strength agent PAE, alkyl ketene dimer AKD, silicone waterproofing agent and ammonium zirconium carbonate; and the added weight of wet strength agent PAE in the composite water-proof and moisture-proof agent is controlled to be 0.1% of the total absolute dry weight of each slurry, the added weight of alkyl ketene dimer AKD is 0.4% of the total absolute dry weight of each slurry, the added weight of silicone waterproofing agent is 0.1% of the total absolute dry weight of each slurry, and the added weight of ammonium zirconium carbonate is 0.04% of the total absolute dry weight of each slurry.

[0110] 3. Molding The surface layer pulp after internal sizing, the core layer pulp after internal sizing, and the bottom layer pulp after internal sizing are sizing and mesh forming (multi-mesh forming). The surface layer, core layer and bottom layer are composited into one body and then pre-dried until the moisture content of the base paper is 7.5wt%, to obtain a composite base paper with a surface layer weight proportion of 25wt%, a core layer weight proportion of 50wt%, and a bottom layer weight proportion of 25wt%.

[0111] Among them, the weight of the composite base paper is controlled to be 380g / m 2 .

[0112] In the pre-drying, multiple drying cylinders are used to dry the fabric. The drying process is controlled to be divided into low-temperature drying, medium-high temperature drying, high-temperature drying, and medium-low temperature drying processes. The specific drying temperature curve is low-temperature drying (35°C), medium-high temperature drying (85°C), high-temperature drying (110°C), and medium-low temperature drying (70°C).

[0113] 4. One-time calendering The composite base paper is subjected to a calendering treatment, the line pressure of the calendering machine is controlled to be 100 kN / m, and the hot oil temperature of the calendering machine is controlled to be 130° C., so as to obtain the composite base paper after the first calendering.

[0114] 5. Surface sizing The surface sizing agent was used to apply surface sizing to the upper and lower surfaces of the composite base paper after the first calendering. The surface sizing pressure was controlled to be 31KN / m, the surface sizing temperature was 42℃, the surface sizing speed was 120m / min, and the single-side sizing amount of the surface sizing was 3.8g / m 2 , and obtain the composite base paper after surface sizing.

[0115] The surface sizing agent is composed of the following raw materials in parts by weight: 40 parts of polyvinyl alcohol, 20 parts of resistant modified starch, 25 parts of vinyl acetate, 13.3 parts of dry strength agent, 0.1 parts of bactericide, 1 part of lubricant, 0.1 parts of defoamer and 0.5 parts of water repellent.

[0116] The resistant starch is oxidized corn starch.

[0117] The dry strength agent is composed of polyacrylamide and guar gum, and the weight ratio of polyacrylamide to guar gum is 2:1.

[0118] The lubricant is calcium stearate.

[0119] The defoaming agent is a fatty acid defoaming agent.

[0120] The water repellent is a polyamide polyurea high molecular oligomer.

[0121] The fungicide is a nitrogen-containing heterocyclic compound fungicide.

[0122] 6. Second calendering The composite base paper after surface sizing is subjected to secondary calendering treatment, the line pressure of the calender of the secondary calendering is controlled to be 100 kN / m, the hot oil temperature of the calender is 130° C., and then the composite base paper is curled and slit to obtain the electronic paper carrier base paper.

[0123] This embodiment also provides an electronic paper carrier base paper prepared by the above method.

[0124] Comparative Example 1 Comparative Example 1 adopts the technical scheme of Example 1, except that: in the surface sizing step, the surface sizing agent used is composed of the following raw materials in parts by weight: 20 parts of polyvinyl alcohol, 40 parts of resistant modified starch, 30 parts of vinyl acetate, 8.8 parts of dry strength agent, 0.1 part of bactericide, 0.5 part of lubricant, 0.1 part of defoaming agent, and 0.5 part of water repellent.

[0125] Comparative Example 2 Comparative Example 2 adopts the technical scheme of Example 1, except that: in the surface sizing step, the surface sizing agent used is composed of the following raw materials in parts by weight: 30 parts of polyvinyl alcohol, 40 parts of resistant modified starch, 20 parts of vinyl acetate, 8.8 parts of dry strength agent, 0.1 part of bactericide, 0.5 part of lubricant, 0.1 part of defoaming agent, and 0.5 part of water repellent.

[0126] Comparative Example 3 Comparative Example 3 adopts the technical solution of Example 1, except that: in the surface sizing step, the surface sizing agent used is composed of the following raw materials in parts by weight: 40 parts of polyvinyl alcohol, 30 parts of resistant modified starch, 20 parts of vinyl acetate, 8.8 parts of dry strength agent, 0.1 part of bactericide, 0.5 part of lubricant, 0.1 part of defoaming agent, and 0.5 part of water repellent.

[0127] The internal bonding strength and surface strength (wax stick test method) of the electronic paper carrier base paper of Examples 1-4 and Comparative Examples 1-3 were respectively measured, and the surface condition of the base paper was observed in the wax stick test of surface strength. Furthermore, the hot-melt cover tape was heat-sealed to each electronic paper carrier base paper and then peeled off, the maximum peeling force and the minimum peeling force were detected, the average peeling force and the extreme peeling force were calculated, and it was observed whether the cover tape had the phenomenon of pulling up lint or base paper fibers. Furthermore, the moisture absorption per unit area of ​​the surface of each electronic paper carrier base paper within 120s was detected, namely Cobb (120s). The specific results are shown in the following table:

[0128] It can be seen that the electronic paper carrier base paper of Examples 1-4 of the present invention has an internal bonding strength of ≥375 J / m 2 , surface water absorption ≤29g / m 2 The surface strength (wax stick test method) can reach 23A. The average tensile force of the hot-melt cover tape after heat sealing is 18.3-25.6gf, which effectively keeps the peeling force range within 21-24.5gf. At the same time, Cobb (120s) is 26-29g / m 2 Compared with the traditional process, the mechanical properties of the electronic paper carrier base paper are significantly improved, especially in indicators such as surface strength and peeling force extreme difference; at the same time, when the hot-melt cover tape is released from the surface of the paper carrier after heat sealing, its peeling force is stable and there is no surface pulling phenomenon; it can effectively solve the problem that the electronic paper carrier base paper is prone to paper tape delamination after repeated winding in subsequent processing and downstream use, effectively improve the bonding strength between the layers of the base paper, and optimize the bonding matching between the electronic paper carrier base paper and its hot-melt cover tape, while avoiding damage to the carrier surface during the peeling process of the hot-melt cover tape; and further improve the peeling stability, reduce the peeling force fluctuation, avoid the sudden change of peeling force, realize the precise and stable control of the peeling force, effectively reduce the extreme difference of the peeling force, and further improve the performance of the electronic paper carrier base paper.

[0129] After the dosage of the relevant raw materials of the surface sizing agent was changed in Comparative Examples 1 and 2, the surface strength was significantly reduced, and the surface of the base paper in the wax stick test of the surface strength was damaged; after the dosage of the relevant raw materials of the surface sizing agent was changed in Comparative Example 3, although a good surface strength could be obtained, its peeling force was significantly reduced compared with that of each embodiment, and Cobb (120s) was 35g / m 2 , it cannot meet the thickness expansion rate requirements under harsh temperature and humidity environments, and it is easy for the hole cavity size to expand and contract after punching, which in turn leads to material jamming quality accidents in the subsequent braiding process.

[0130] Unless otherwise specified, all percentages used in the present invention are by mass.

[0131] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for producing a surface sizing of an electronic paper carrier base paper, characterized in that: The process includes the following steps: slurry treatment, internal sizing, molding, primary calendering, surface sizing, and secondary calendering; The pulp treatment method comprises beating chemical coniferous pulp, chemical hardwood pulp and recycled pulp respectively to obtain refined chemical coniferous pulp, refined chemical hardwood pulp and refined recycled pulp; The refined chemical coniferous pulp and the refined chemical hardwood pulp are mixed evenly to obtain the surface layer pulp; the refined chemical coniferous pulp, the refined chemical hardwood pulp and the refined recycled pulp are mixed evenly to obtain the core layer pulp; the refined chemical coniferous pulp and the refined chemical hardwood pulp are mixed evenly to obtain the bottom layer pulp; the surface layer pulp, the core layer pulp and the bottom layer pulp are sizing-applied in the pulp, the mesh part is formed and compounded into one body, and then pre-dried to obtain the composite base paper; The composite base paper is calendered once, then surface sized with a surface sizing agent, and then calendered twice to obtain an electronic paper carrier base paper; The surface sizing agent is composed of the following raw materials in parts by weight: 35-40 parts of polyvinyl alcohol, 20-25 parts of resistant modified starch, 20-25 parts of vinyl acetate, 12.8-13.8 parts of dry strength agent, 0.1-0.2 parts of bactericide, 0.5-1 parts of lubricant, 0.1-0.2 parts of defoamer and 0.5-0.6 parts of water repellent.

2. The surface sizing production method of electronic paper carrier base paper according to claim 1, characterized in that: In the pulp treatment, the beating degree of refined chemical coniferous pulp is 45-50°SR, and the average fiber length is 0.6-1mm; the beating degree of refined chemical hardwood pulp is 45-50°SR, and the average fiber length is 0.5-0.8mm; the beating degree of refined recycled pulp is 40-45°SR, and the average fiber length is 0.5-0.7mm.

3. The method for producing the surface sizing of the electronic paper carrier base paper according to claim 1, characterized in that: In the pulp treatment, the beating concentration of the chemical coniferous pulp is controlled to be 3.5-4.0wt%, the beating power is 750-770kw, and the beating temperature is 31-33°C; The chemical hardwood pulp concentration is controlled to be 3.5-4.0wt%, the pulping power is 770-800kw, and the pulping temperature is 33-35℃; The pulping concentration of the recycled pulp is controlled to be 3.5-4.0wt%, the pulping power is 320-360kw, and the pulping temperature is 35-38℃.

4. The method for producing the surface sizing of the electronic paper carrier base paper according to claim 1, characterized in that: In the surface layer pulp, the weight ratio of refined chemical coniferous pulp to refined chemical broadleaf pulp is 20-50:50-80; in the core layer pulp, the weight ratio of refined chemical coniferous pulp, refined chemical broadleaf pulp and refined recycled pulp is 5-30:5-40:30-50; in the bottom layer pulp, the weight ratio of refined chemical coniferous pulp to refined chemical broadleaf pulp is 10-40:60-90.

5. The method for producing the surface sizing of the electronic paper carrier base paper according to claim 1, characterized in that: The slurry sizing is performed by using a composite water-proof and moisture-proof agent; the composite water-proof and moisture-proof agent is a compound of wet strength agent PAE, alkyl ketene dimer AKD, organosilicon waterproofing agent, and ammonium zirconium carbonate; In the slurry sizing, the weight of the wet strength agent PAE in the composite water-proof and moisture-proof agent is controlled to be 0.085-0.115% of the total absolute dry weight of the slurry, the weight of the alkyl ketene dimer AKD is controlled to be 0.35-0.45% of the total absolute dry weight of the slurry, the weight of the silicone waterproofing agent is controlled to be 0.09-0.11% of the total absolute dry weight of the slurry, and the weight of the ammonium zirconium carbonate is controlled to be 0.03-0.06% of the total absolute dry weight of the slurry.

6. The method for producing the surface sizing of the electronic paper carrier base paper according to claim 1, characterized in that: The weight of the surface layer of the composite base paper accounts for 20-25wt%, the weight of the core layer accounts for 50-55wt%, and the weight of the bottom layer accounts for 20-25wt%; The composite base paper has a moisture content of 6-8wt% and a basis weight of 250-900g / m 2 .

7. The method for producing the surface sizing of the electronic paper carrier base paper according to claim 1, characterized in that: The surface sizing method comprises the following steps: applying surface sizing agent to the upper and lower surfaces of the composite base paper after the first calendering, controlling the surface sizing pressure to be 30-33 KN / m, the surface sizing temperature to be 40-45° C., the surface sizing speed to be 115-125 m / min, and the single-side sizing amount to be 3.6-4.2 g / m 2 , and obtain the composite base paper after surface sizing.

8. The method for producing the surface sizing of the electronic paper carrier base paper according to claim 1, characterized in that: In the surface sizing agent, the modification-resistant starch is oxidized corn starch; The dry strength agent is composed of polyacrylamide and guar gum, and the weight ratio of polyacrylamide to guar gum is 1.8-2:1; The lubricant is calcium stearate or polyethylene wax; The defoamer is one of the following: fatty acid defoamer, modified polysiloxane defoamer, hydrophobic silica; The water repellent is one of the following: glyoxal, polyamide polyurea high molecular oligomer, potassium zirconium carbonate.

9. The method for producing the surface sizing of the electronic paper carrier base paper according to claim 1, characterized in that: During the primary calendering, the line pressure of the calender is controlled to be 100-105 kN / m, and the hot oil temperature of the calender is 100-150° C.; In the secondary calendering, the line pressure of the calender is controlled to be 100-105 kN / m, and the hot oil temperature of the calender is controlled to be 100-150°C.

10. An electronic paper carrier base paper produced by the production method according to any one of claims 1 to 9.

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