Production method of a high-strength aluminized base paper

Abstract

The present invention belongs to the technical field of special paper preparation, and particularly relates to a production method of high-strength aluminized base paper, comprising the steps of: S1, beating: respectively beating long-fiber primary pulp and short-fiber primary pulp, wherein the beating degree of the long fiber is 40-50°SR, and the beating degree of the short fiber is 20-30°SR; S2, adding additives: adding modified inorganic filler, cationic starch and retention aid to the short-fiber pulp; S3, pulp mixing: mixing the long-fiber pulp and the short-fiber pulp according to a weight ratio, and then adding modified bamboo fiber, and uniformly stirring to form a mixed pulp; S4, wire drawing and papermaking; S5, spraying a surface treatment agent; S6, paper drying, calendering and winding. The aluminized base paper obtained by the production method of the high-strength aluminized base paper of the present invention has the advantages of high strength and good smoothness.

Description

Technical Field

[0001] The present invention belongs to the technical field of special paper preparation, and particularly relates to a production method of high-strength aluminized base paper. Background Art

[0002] Aluminized paper is a kind of paper with an aluminum foil coating, which is made by laminating a thin aluminum layer onto the surface of the paper through methods such as coating or aluminizing. Its purpose is to provide good barrier properties and protective properties for the paper, preventing oxygen, moisture, light or other external factors from affecting the packaged goods. Based on this, aluminized paper mainly has the following characteristics and applications:

[0003] First, good barrier properties: Aluminum has high gas and moisture barrier properties. By adding an aluminum layer on the paper surface, it can effectively prevent the penetration of external substances such as air and water vapor, thereby protecting the packaged goods from environmental pollution and moisture.

[0004] Second, good freshness preservation properties: Aluminized paper is often used in food packaging because the aluminum layer can block oxygen and moisture, preventing food from spoiling, oxidizing and rotting. Therefore, aluminized paper can extend the shelf life of food.

[0005] Third, good gloss and reflective properties: The aluminum layer has good reflective properties, so the surface of aluminized paper presents a metallic luster, which makes it very popular in some fields such as tobacco packaging and candy packaging.

[0006] Fourth, good heat insulation properties: The aluminum layer also has certain heat insulation properties, so aluminized paper can also be used in some packaging occasions that require heat insulation, such as hot beverage packaging.

[0007] Fifth, easy processability: Aluminized paper still maintains the flexibility of the paper during some processing processes, which makes it easier to process and form in packaging manufacturing.

[0008] Generally, aluminized paper mainly consists of base paper, aluminum layer and coating. To meet the requirements of aluminizing and use, the strength of the base paper is generally higher than that of ordinary paper. At present, domestic aluminized base paper is made by mixing all chemical wood pulp and using a high dosage of wet strength agent to improve the strength of the paper. This method has a high cost and limited ability to improve the strength of the paper, resulting in low market competitiveness of the product. However, existing conventional methods for improving the strength of paper, such as adding reinforcing fibers, are often not applicable to the production of aluminized base paper because reinforcing fibers are generally relatively thick. The use of reinforcing fibers easily leads to a loose and rough fiber structure on the paper surface, making the surface of the base paper rough and the smoothness poor. As a result, the flatness of the paper surface after laminating the aluminum layer cannot meet the printing requirements of packaging, and the gloss of the aluminum layer on the paper surface is poor and the appearance quality of the product is low. In addition, in the prior art, in order to improve the strength and smoothness of the base paper, the paper surface is often coated before aluminizing to improve the strength, surface flatness and brightness of the paper. However, this method has very limited improvement on the performance of aluminized paper.

[0009] In order to improve the performance of aluminized paper and make it meet the requirements of packaging printing materials, it is necessary to improve the processing method of existing aluminized base paper to improve the strength of the paper without reducing the surface roughness of the paper. Summary of the Invention

[0010] The object of the present invention is to provide a production method of high-strength aluminized base paper for the above-mentioned existing technical problems, so as to improve the strength of the paper without reducing the surface roughness of the paper.

[0011] In view of this, the present invention provides a production method of high-strength aluminized base paper, including the steps:

[0012] S1, beating: First, loosen and dilute long fiber pulp board and short fiber pulp board into long fiber primary pulp and short fiber primary pulp with a concentration of 4-6% respectively, and then beat the long fiber primary pulp and short fiber primary pulp respectively. Among them, the beating degree of long fiber is 40-50°SR, and the beating degree of short fiber is 20-30°SR;

[0013] S2, adding additives: Add modified inorganic filler, cationic starch and retention aid to the short fiber pulp, and stir evenly; among them, the dosage of modified inorganic filler is 10-15% of the weight of short fiber absolute dry pulp, the dosage of cationic starch is 0.3-0.5% of the weight of short fiber absolute dry pulp, and the dosage of retention aid is 0.01-0.3% of the weight of short fiber absolute dry pulp;

[0014] S3, pulp mixing: Mix long fiber pulp and short fiber pulp according to the weight ratio of long fiber pulp to short fiber pulp of 20-30:70-80, and then add 5-8% of modified bamboo fiber based on the weight of absolute dry pulp, and stir evenly to make a mixed pulp;

[0015] S4, Wire drawing and papermaking: When papermaking, the consistency of the sizing material on the wire is 0.4 - 0.9%, and the paper machine speed is 300 - 500 m / min;

[0016] S5, Spraying surface treatment agent: Spraying surface treatment agent on the paper surface, and the coating amount of the surface treatment agent is 3 - 5 g / m 2 ;

[0017] S6, Paper drying, calendering and winding: The wet paper web enters the drying device for drying after pressing. The drying temperature is 150 - 250 °C, and the drying time is not less than 30 s. Then it undergoes 1 - 3 passes of calendering, and the calendering pressure is 500 - 3000 kN / m 2 , and finally winding is carried out to obtain the base paper for aluminizing.

[0018] Furthermore, in the step S3, the preparation process of the modified bamboo fiber is as follows:

[0019] First, cut and crush the bamboo into particulate matter with a particle size ≤ 0.5 cm;

[0020] Then add an appropriate amount of water, stir and soak at room temperature for 2 - 6 h. After the soaking is completed, let it stand to stratify the mixed system, collect the floating matter A on the upper layer and the precipitate B on the lower layer. After drying the floating matter A on the upper layer, reserve it for later use;

[0021] Mix the precipitate B on the lower layer with an appropriate amount of water to obtain a dispersion of the precipitate B; then add the dispersion of the precipitate B to a ball mill, and fill the ball mill with an inert gas to displace the air therein. Then, at a rotation speed of 300 - 1000 revolutions / min, ball mill for 10 - 30 min. After the ball milling treatment is completed, filter, wash with water and dry the material to obtain the modified bamboo fiber.

[0022] Furthermore, in the dispersion of the precipitate B, the content of the precipitate B is 20 - 40%.

[0023] Furthermore, the preparation process of the modified bamboo fiber also includes:

[0024] After obtaining the precipitate B on the lower layer, first add the precipitate B on the lower layer to a 10 - 20% sodium hydroxide aqueous solution, boil for 10 - 30 min, then filter and wash with water;

[0025] Then put it into 5 - 10% hydrogen peroxide solution, soak at 50 - 70 °C for 30 - 60 min, filter and wash with water;

[0026] Then mix the washed precipitate B on the lower layer with an appropriate amount of water to obtain a dispersion of the precipitate B, and add the dispersion of the precipitate B to a ball mill for ball milling treatment to obtain the modified bamboo fiber.

[0027] Further, in the step S2, by weight, the modified inorganic filler includes:

[0028] 70 - 80 parts of inorganic filler;

[0029] 20 - 30 parts of the float A.

[0030] Further, the inorganic filler is one or more of calcium carbonate, talcum powder, and silicate.

[0031] Further, the preparation method of the modified inorganic filler includes:

[0032] First, take the formula amount of inorganic filler and float A, mix the two evenly, place them in a ball mill, and under the rotation speed of 100 - 500 r / min, ball mill for a certain time. When the particle size of the mixed powder ≤ 1um, the ball milling treatment is completed to obtain the modified inorganic filler.

[0033] Further, in the step S5, the surface treatment agent is a mixture of hydroxypropyl methylcellulose solution and silica sol.

[0034] Further, the concentration of the hydroxypropyl methylcellulose solution is 20 - 30%, and the content of nano - silica in the silica sol is 5 - 15%; the surface treatment agent is formed by mixing the hydroxypropyl methylcellulose solution and silica sol according to a weight ratio of 1:(0.5 - 1).

[0035] Further, in the step S6, the paper is calendered twice. Among them, the pressure of the first calendering is 1000 - 3000 kN / m 2 , and the pressure of the second calendering is 500 - 1000 kN / m 2 .

[0036] In the production method of the high - strength aluminized base paper of the present invention:

[0037] First, by the combined use of long fibers and short fibers, the addition of long fibers makes the obtained aluminized base paper have higher strength and durability, and can better resist tensile and tearing damage. At the same time, the addition of short fibers makes the paper surface structure uniform, the paper soft and smooth, with good comprehensive performance;

[0038] Second, when pulping long fibers and short fibers, by regulating the beating degrees of the long fibers and short fibers, the beating degree of the long fibers is relatively high, being 40 - 50°SR, and the beating degree of the short fibers is relatively low, being 20 - 30°SR. In this way, the disintegration and dispersion degrees of the long fibers are relatively high, while those of the short fibers are relatively low. Through the coordination of the beating degrees, long fibers and short fibers with relatively close radial dimensions can be obtained after beating, enabling the long fibers and short fibers in the paper to be evenly dispersed, with small differences in microscopic dimensions, a uniform paper surface, high consistency, low roughness, and high smoothness.

[0039] Third, when adding modified inorganic fillers, by selectively mixing the modified inorganic fillers with the short fiber pulp first, the modified inorganic fillers can preferentially bind to the short fibers. Since the short fibers have a large specific surface area, stronger nano - size effects, and better adsorption ability, the modified inorganic fillers can bind more to the surface of the short fibers. In this way, on the one hand, the ability of the long fibers to improve the paper strength can be better retained and exerted; on the other hand, the problems of voids on the paper surface and increased local roughness caused by the attachment of the modified inorganic fillers to the large - sized long fibers can be improved.

[0040] Fourth, in the present invention, after the modified bamboo fibers used are disintegrated, soaked, and the floating matter A on the upper layer is separated, the fiber content in the lower precipitate B obtained is high and the adhesive ability decreases. Therefore, it has the advantages of high strength and easy dispersion. After ball - milling treatment, bamboo fiber micro - filaments with large length dimensions, small radial dimensions, and good flexibility can be obtained. When used in the aluminized base paper described in the present invention, the mechanical strength of the paper can be greatly improved, and at the same time, the influence on the surface roughness of the paper is small.

[0041] Fifth, in the present invention, the modified inorganic filler used is a mixture of the floating matter A on the upper layer and the inorganic filler. During the preparation process, through the ball - milling effect, on the one hand, the floating matter A and the inorganic filler can be tightly combined; on the other hand, the particle size of the filler can be further reduced to improve the surface roughness of the paper.

[0042] Sixth, more importantly, the floating matter A on the upper layer contains a large number of parenchyma cells, which contain substances with adhesive ability such as starch. After being compounded with the inorganic filler and used for papermaking, during the paper preparation process, the floating matter A therein can be melted and flowed by the high temperature and high pressure during drying and calendering, enabling the inorganic particles to be well adhered in the paper, and at the same time, the strength of the paper can be improved through the adhesive force; in addition, the melting and flowing ability of the floating matter A can also be used to fill the micropores on the paper surface and improve the surface roughness of the paper.

[0043] Seventh, after the paper is prepared by online papermaking, by spraying a hydroxypropyl methylcellulose solution and silica sol on the paper surface, on the one hand, the filling ability of the silica sol can be utilized to further fill the micropores on the paper surface; at the same time, the hydroxypropyl methylcellulose solution can be used to adhere to and embed the filler particles and coarse fibers on the paper surface, improving the paper surface structure; through the cooperation of the two effects, the strength and surface smoothness of the paper are further improved. Detailed implementation manners

[0044] The technical solutions in the embodiments of the present application will be clearly described below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0045] In the description of the present application, it should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary embodiments according to the present application. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0046] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of the same type and do not limit the number of objects. For example, the first object can be one or multiple. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / " generally means an "or" relationship between the associated objects before and after.

[0047] It should be noted that in this application, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of this application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, the features described with reference to certain examples may be combined in other examples.

[0048] A production method of high-strength aluminized base paper, comprising the steps of:

[0049] S1, beating: First, loosen and dilute the long fiber pulp board and short fiber pulp board into long fiber primary pulp and short fiber primary pulp with a concentration of 4-6% respectively, and then beat the long fiber primary pulp and short fiber primary pulp respectively. Among them, the beating degree of the long fiber is 40-50°SR, and the beating degree of the short fiber is 20-30°SR;

[0050] S2, adding additives: Add modified inorganic filler, cationic starch and retention aid to the short fiber pulp, and stir evenly; among them, the dosage of the modified inorganic filler is 10-15% of the weight of the short fiber absolute dry pulp, the dosage of the cationic starch is 0.3-0.5% of the weight of the short fiber absolute dry pulp, and the dosage of the retention aid is 0.01-0.3% of the weight of the short fiber absolute dry pulp;

[0051] S3, pulp mixing: Mix the long fiber pulp and the short fiber pulp according to the weight ratio of the long fiber pulp to the short fiber pulp of 20-30:70-80, and then add 5-8% of the modified bamboo fiber based on the weight of the absolute dry pulp, and stir evenly to make a mixed pulp;

[0052] S4, forming on the wire: When forming, the on-wire concentration of the pulp is 0.4-0.9%, and the machine speed is 300-500 m / min;

[0053] S5, spraying surface treatment agent: Spray the surface treatment agent on the paper surface, and the coating amount of the surface treatment agent is 3-5 g / m 2 ;

[0054] S6, Paper Drying, Calendering and Reeling: The wet paper sheet enters the drying device for drying after pressing. The drying temperature is 150 - 250 °C, and the drying time is not less than 30 s. Then it undergoes 1 - 3 calendering processes, and the calendering pressure is 500 - 3000 kN / m 2 , and finally it is reeled to obtain the aluminized base paper.

[0055] As some embodiments of the present invention, in the step S2, the retention aid is one of polyacrylamide, polypropylene sulfonate, polymeric aluminum hydroxide, etc.

[0056] Furthermore, in the step S3, the preparation process of the modified bamboo fiber is as follows:

[0057] Firstly, cut and crush the bamboo into particulate matter with a particle size ≤ 0.5 cm;

[0058] After that, add an appropriate amount of water, stir and soak at room temperature for 2 - 6 h. After the soaking is completed, let it stand to make the mixed system stratify, collect the upper floating matter A and the lower precipitate B. Dry the upper floating matter A and reserve it for use;

[0059] Mix the lower precipitate B with an appropriate amount of water to obtain a dispersion of precipitate B; then add the dispersion of precipitate B to a ball mill, and fill the ball mill with an inert gas to displace the air therein. Then, at a rotation speed of 300 - 1000 revolutions per minute, ball mill for 10 - 30 min. After the ball milling treatment, filter, wash with water and dry the material to obtain the modified bamboo fiber.

[0060] Preferably, in the dispersion of precipitate B, the content of precipitate B is 20 - 40%.

[0061] Even further, the preparation process of the modified bamboo fiber further includes:

[0062] After obtaining the lower precipitate B, first add the lower precipitate B to a 10 - 20% sodium hydroxide aqueous solution, boil for 10 - 30 min, then filter and wash with water;

[0063] Then put it into 5 - 10% hydrogen peroxide solution and soak at 50 - 70 °C for 30 - 60 min, filter and wash with water;

[0064] Then mix the washed lower precipitate B with an appropriate amount of water to obtain a dispersion of precipitate B, and add the dispersion of precipitate B to a ball mill for ball milling treatment to obtain the modified bamboo fiber.

[0065] Preferably, in the preparation process of the modified bamboo fiber, 20 - 40 parts by weight of the lower precipitate B can be added to 100 parts by weight of a sodium hydroxide aqueous solution with a concentration of 10 - 20%.

[0066] Preferably, in the preparation process of the modified bamboo fiber, 30 to 50 parts by weight of the precipitate B in the lower layer can be added to 100 parts by weight of an aqueous sodium hydroxide solution with a concentration of 10 to 20%.

[0067] Alkali treatment with an aqueous sodium hydroxide solution and oxidation treatment with hydrogen peroxide can improve the flexibility and dispersibility of bamboo fibers, enabling them to better intertwine evenly with other fibers.

[0068] Furthermore, in the step S2, by weight, the modified inorganic filler includes:

[0069] 70 to 80 parts of inorganic filler;

[0070] 20 to 30 parts of the floating matter A.

[0071] As some embodiments of the present invention, the inorganic filler is one or more of calcium carbonate, talcum powder, silicate, etc.

[0072] Even further, the preparation method of the modified inorganic filler includes:

[0073] First, take the formula amount of inorganic filler and floating matter A, mix the two evenly, place them in a ball mill, and under a rotation speed of 100 to 500 revolutions per minute, ball mill for a certain time until the particle size of the mixed powder ≤ 1 μm, then the ball milling treatment is completed to obtain the modified inorganic filler.

[0074] Furthermore, in the step S5, the surface treatment agent is a mixture of a hydroxypropyl methylcellulose solution and silica sol.

[0075] Preferably, the concentration of the hydroxypropyl methylcellulose solution is 20 to 30%, and the content of nano-silica in the silica sol is 5 to 15%.

[0076] Even further, the surface treatment agent is formed by mixing the hydroxypropyl methylcellulose solution and silica sol in a weight ratio of 1:(0.5 to 1).

[0077] Furthermore, in the step S6, the paper is calendered twice, wherein the pressure of the first calendering is 1000 to 3000 kN / m 2 , and the pressure of the second calendering is 500 to 1000 kN / m 2 .

[0078] In the production method of the high-strength aluminized base paper of the present invention:

[0079] First, by using long fibers and short fibers in combination, the addition of long fibers makes the obtained aluminized base paper have high strength and durability, and can better resist tensile and tear damage. At the same time, the addition of short fibers makes the paper surface structure uniform, the paper soft and smooth, with good comprehensive performance;

[0080] Second, when pulping long fibers and short fibers, by controlling the beating degree of long fibers and short fibers, the beating degree of long fibers is relatively high, at 40 - 50°SR, and the beating degree of short fibers is relatively low, at 20 - 30°SR. In this way, the disintegration and dispersion degree of long fibers is relatively high, and the disintegration and dispersion degree of short fibers is relatively low. In this way, through the cooperation of beating degrees, long fibers and short fibers with relatively close radial dimensions can be obtained after beating, so that the long fibers and short fibers in the paper are evenly dispersed, with small microscopic size differences, uniform paper surface, high consistency, low roughness and high smoothness;

[0081] Third, when adding modified inorganic fillers, by selectively mixing the modified inorganic fillers with short fiber pulp first, the modified inorganic fillers can preferentially bind to short fibers. Since short fibers have a larger specific surface area, stronger nano - size effect and better adsorption ability, the modified inorganic fillers can be more combined on the surface of short fibers. In this way, on the one hand, the ability of long fibers to improve paper strength can be better retained and exerted, and on the other hand, the problems of voids on the paper surface and increased local roughness caused by the attachment of modified inorganic fillers on large - size long fibers can be improved;

[0082] Fourth, in the present invention, after the used modified bamboo fibers are disintegrated, soaked and the floating matter A on the upper layer is separated, the fiber content in the lower precipitate B obtained is high and the adhesive ability decreases. Therefore, it has the advantages of high strength and easy dispersion. After ball - milling treatment, bamboo fiber microfilaments with large length dimensions, small radial dimensions and good flexibility can be obtained. When used in the aluminized base paper described in the present invention, the mechanical strength of the paper can be greatly improved, and at the same time, the influence on the surface roughness of the paper is small;

[0083] Fifth, in the present invention, the used modified inorganic filler is a mixture of the floating matter A on the upper layer and inorganic fillers. During its preparation process, through ball - milling action, on the one hand, the floating matter A and inorganic fillers can be closely combined; on the other hand, the particle size of the filler can be further reduced to improve the paper surface roughness;

[0084] Sixth, and more importantly, the floating matter A in the upper layer contains a large number of thin-walled cells, which contain substances with adhesive ability such as starch. After being compounded with inorganic fillers and used for papermaking, during the paper preparation process, the high temperature and high pressure during drying and calendering can be utilized to make the floating matter A in it melt and flow, and adhere the inorganic particles well in the paper. At the same time, the strength of the paper can be improved through the adhesive force; in addition, the melting and flowing ability of the floating matter A can also be used to fill the micropores on the paper surface and improve the surface roughness of the paper;

[0085] Seventh, after the paper is prepared on the wire, by spraying hydroxypropyl methylcellulose solution and silica sol on the paper surface, on the one hand, the filling ability of the silica sol can be utilized to further fill the micropores on the paper surface; at the same time, the hydroxypropyl methylcellulose solution can be used to adhere to and embed the filler particles and coarse fibers on the paper surface, improving the surface structure of the paper; through the cooperation of the two effects, the strength and surface smoothness of the paper are further improved.

[0086] The production method of the high-strength aluminized base paper of the present invention is illustrated by the following specific examples. Specifically:

[0087] Example 1

[0088] Preparation of modified bamboo fiber:

[0089] First, cut and crush the bamboo into particulate matter with a particle size ≤ 0.5 cm;

[0090] After that, add an appropriate amount of water, stir and soak at room temperature for 3 h. After the soaking is completed, let it stand to make the mixed system stratified. Collect the floating matter A in the upper layer and the precipitate B in the lower layer. After drying the floating matter A in the upper layer, reserve it for later use;

[0091] Mix the precipitate B in the lower layer with an appropriate amount of water to obtain a dispersion with a precipitate B content of 30%; then add the dispersion of the precipitate B to a ball mill, and fill the ball mill with an inert gas to displace the air in it. Then, at a rotation speed of 500 revolutions / min, ball mill for 20 min. After the ball milling treatment is completed, filter, wash and dry the material to obtain modified bamboo fiber.

[0092] Example 2

[0093] Preparation of modified bamboo fiber:

[0094] First, cut and crush the bamboo into particulate matter with a particle size ≤ 0.5 cm;

[0095] After that, add an appropriate amount of water, stir and soak at room temperature for 3 h. After the soaking is completed, let it stand to make the mixed system stratified. Collect the floating matter A in the upper layer and the precipitate B in the lower layer. After drying the floating matter A in the upper layer, reserve it for later use;

[0096] After obtaining the precipitate B in the lower layer, first add 40 parts by weight of the precipitate B in the lower layer to 100 parts by weight of a sodium hydroxide aqueous solution with a concentration of 10%, boil for 20 min, then filter and wash with water; afterwards, put it into 100 parts by weight of hydrogen peroxide with a concentration of 5%, soak at 60 °C for 30 min, filter and wash with water; then mix the washed precipitate B in the lower layer with an appropriate amount of water to obtain a dispersion with a precipitate B content of 30%; afterwards, add the dispersion of precipitate B to a ball mill, fill the ball mill with an inert gas to displace the air therein, and then ball mill at a rotation speed of 500 rpm for 20 min. After the ball milling treatment is completed, filter, wash with water and dry the material to obtain modified bamboo fibers.

[0097] Example 3

[0098] Preparation of modified inorganic filler:

[0099] First, take 70 parts by weight of inorganic filler and 30 parts by weight of the floating matter A obtained in Example 1 above. After mixing the two evenly, place them in a ball mill and ball mill for a certain time at a rotation speed of 200 rpm until the particle size of the mixed powder ≤ 1 μm. When the ball milling treatment is completed, the modified inorganic filler is obtained.

[0100] Example 4

[0101] A production method of high-strength aluminized base paper includes the steps:

[0102] S1, beating: First, loosen and dilute the long fiber pulp board and short fiber pulp board into long fiber primary pulp and short fiber primary pulp with a concentration of 4% respectively, and then beat the long fiber primary pulp and short fiber primary pulp respectively. Among them, the beating degree of the long fiber is 40°SR, and the beating degree of the short fiber is 20°SR;

[0103] S2, adding additives: Add the modified inorganic filler, cationic starch and retention aid obtained in Example 3 above to the short fiber pulp, and stir evenly; among them, the dosage of the modified inorganic filler is 10% of the weight of the short fiber absolute dry pulp, the dosage of the cationic starch is 0.3% of the weight of the short fiber absolute dry pulp, and the dosage of the retention aid is 0.01% of the weight of the short fiber absolute dry pulp;

[0104] S3, pulp mixing: Mix the long fiber pulp and the short fiber pulp according to the weight ratio of long fiber pulp to short fiber pulp of 20:80, and then add 8% of the modified bamboo fiber based on the weight of the absolute dry pulp. The modified fiber is the modified bamboo fiber prepared in Example 1 above. After stirring evenly, make a mixed pulp;

[0105] S4, forming on the wire: When forming, the on-wire concentration of the pulp is 0.4%, and the machine speed is 300 m / min;

[0106] S5, Spraying surface treatment agent: Spray the surface treatment agent on the paper surface, and the coating amount of the surface treatment agent is 3 g / m 2 ; The surface treatment agent is formed by mixing a hydroxypropyl methylcellulose solution with a concentration of 30% and a silica sol with a nano-silica content of 15% in a weight ratio of 1:0.5;

[0107] S6, Paper drying, calendering and coiling: The wet paper sheet enters the drying device for drying after pressing. The drying temperature is 150 °C, and the drying time is not less than 30 s. Then it undergoes 1 pass of calendering, and the calendering pressure is 1000 kN / m 2 , and finally coiling is carried out to obtain the aluminized base paper.

[0108] Example 5

[0109] A production method of a high-strength aluminized base paper, comprising the steps:

[0110] S1, Pulping: First, loosen and dilute the long fiber pulp board and short fiber pulp board into long fiber primary pulp and short fiber primary pulp with a concentration of 5% respectively. Then, beat the long fiber primary pulp and short fiber primary pulp respectively. Among them, the beating degree of the long fiber is 42°SR, and the beating degree of the short fiber is 24°SR;

[0111] S2, Adding additives: Add the modified inorganic filler, cationic starch and retention aid obtained in Example 3 above to the short fiber pulp, and stir evenly; among them, the dosage of the modified inorganic filler is 12% of the weight of the short fiber absolute dry pulp, the dosage of the cationic starch is 0.4% of the weight of the short fiber absolute dry pulp, and the dosage of the retention aid is 0.1% of the weight of the short fiber absolute dry pulp;

[0112] S3, Pulp blending: Blend the long fiber pulp and short fiber pulp in a weight ratio of 25:75. Then add 7% of the modified bamboo fiber based on the weight of the absolute dry pulp. The modified fiber is the modified bamboo fiber prepared in Example 1 above. After stirring evenly, make a mixed pulp;

[0113] S4, Sheet forming on the wire: When forming the sheet, the on-wire concentration of the pulp is 0.7%, and the machine speed is 400 m / min;

[0114] S5, Spraying surface treatment agent: Spray the surface treatment agent on the paper surface, and the coating amount of the surface treatment agent is 3.8 g / m 2 ; The surface treatment agent is formed by mixing a hydroxypropyl methylcellulose solution with a concentration of 25% and a silica sol with a nano-silica content of 10% in a weight ratio of 1:1;

[0115] S6, Paper Drying, Calendering and Reeling: The wet paper sheet enters the drying device for drying after pressing. The drying temperature is 200 °C and the drying time is not less than 30 s. Then it undergoes two passes of calendering. The pressure of the first pass of calendering is 1000 kN / m 2 , and the pressure of the second pass of calendering is 500 kN / m 2 , and finally it is reeled to obtain the aluminized base paper.

[0116] Example 6

[0117] A production method of high-strength aluminized base paper, comprising the steps:

[0118] S1, Pulping: First, the long-fiber pulp board and the short-fiber pulp board are separately loosened and diluted to long-fiber primary pulp and short-fiber primary pulp with a concentration of 6%. Then, the long-fiber primary pulp and the short-fiber primary pulp are respectively pulped. Among them, the beating degree of the long fiber is 50°SR, and the beating degree of the short fiber is 30°SR;

[0119] S2, Adding Auxiliaries: Add the modified inorganic filler, cationic starch and retention aid obtained in Example 3 above to the short-fiber pulp, and stir evenly; among them, the dosage of the modified inorganic filler is 15% of the weight of the short-fiber dry pulp, the dosage of the cationic starch is 0.5% of the weight of the short-fiber dry pulp, and the dosage of the retention aid is 0.3% of the weight of the short-fiber dry pulp;

[0120] S3, Pulp Blending: Blend the long-fiber pulp and the short-fiber pulp according to the weight ratio of long-fiber pulp to short-fiber pulp of 30:70. Then add 5% of the modified bamboo fiber by weight of the dry pulp. The modified fiber is the modified bamboo fiber prepared in Example 2 above. After stirring evenly, make a mixed pulp;

[0121] S4, Web Forming: When forming the web, the on-machine consistency of the pulp is 0.9%, and the machine speed is 500 m / min;

[0122] S5, Spraying Surface Treatment Agent: Spray the surface treatment agent on the paper surface. The coating amount of the surface treatment agent is 5 g / m 2 ; The surface treatment agent is formed by mixing a hydroxypropyl methylcellulose solution with a concentration of 20% and a silica sol with a nano-silica content of 5% in a weight ratio of 1:0.8;

[0123] S6, Paper Drying, Calendering and Reeling: The wet paper sheet enters the drying device for drying after pressing. The drying temperature is 250 °C and the drying time is not less than 30 s. Then it undergoes three passes of calendering. The pressure of the first pass of calendering is 3000 kN / m 2 , and the pressure of the second pass of calendering is 1000 kN / m 2 [[ID=3A]], and the pressure of the third pass of calendering is 500 kN / m 2, finally, winding is carried out to obtain the aluminized base paper.

[0124] Example 7

[0125] A production method of high-strength aluminized base paper, comprising the steps:

[0126] S1, beating: First, the long fiber pulp board and the short fiber pulp board are separately loosened and diluted to long fiber primary pulp and short fiber primary pulp with a concentration of 6%, and then the long fiber primary pulp and the short fiber primary pulp are respectively beaten. Among them, the beating degree of the long fiber is 50°SR, and the beating degree of the short fiber is 30°SR;

[0127] S2, adding additives: Add the modified inorganic filler, cationic starch and retention aid obtained in Example 3 above to the short fiber pulp, and stir evenly; among them, the dosage of the modified inorganic filler is 15% of the weight of the short fiber absolute dry pulp, the dosage of the cationic starch is 0.5% of the weight of the short fiber absolute dry pulp, and the dosage of the retention aid is 0.3% of the weight of the short fiber absolute dry pulp;

[0128] S3, pulp mixing: Mix the long fiber pulp and the short fiber pulp according to the weight ratio of long fiber pulp to short fiber pulp of 30:70, and then add 5% of the modified bamboo fiber based on the weight of the absolute dry pulp. The modified fiber is the modified bamboo fiber prepared in Example 1 above, and after stirring evenly, a mixed pulp is made;

[0129] S4, forming on the wire: When forming, the on-wire concentration of the pulp is 0.9%, and the machine speed is 500 m / min;

[0130] S5, spraying surface treatment agent: Spray the surface treatment agent on the paper surface, and the coating amount of the surface treatment agent is 5 g / m 2 ; The surface treatment agent is formed by mixing a hydroxypropyl methylcellulose solution with a concentration of 20% and a silica sol with a nano-silica content of 5% according to a weight ratio of 1:0.8;

[0131] S6, paper drying, calendering and winding: The wet paper web enters the drying device for drying after pressing. The drying temperature is 250 °C, and the drying time is not less than 30 s. Then it undergoes 3 passes of calendering. The pressure of the first pass of calendering is 3000 kN / m 2 , the pressure of the second pass of calendering is 1000 kN / m 2 , the pressure of the third pass of calendering is 500 kN / m 2 , finally, winding is carried out to obtain the aluminized base paper.

[0132] Comparative Example 1

[0133] A production method of high-strength aluminized base paper:

[0134] The difference between this and Example 7 above is only that instead of adding modified inorganic filler, an equal amount of inorganic filler calcium carbonate is used, and the rest of the operations are the same as those in Example 7 above, which will not be elaborated here.

[0135] Comparative Example 2

[0136] A production method of high-strength aluminized base paper:

[0137] The difference between this and Example 7 above is only that first, the beaten long fiber pulp and short fiber pulp are mixed, and then modified inorganic filler, cationic starch, retention aid and modified bamboo fiber are added to the mixed pulp, and the rest of the operations are the same as those in Example 7 above, which will not be elaborated here.

[0138] Comparative Example 3

[0139] A production method of high-strength aluminized base paper:

[0140] The difference between this and Example 7 above is only that in step S3, an equal amount of bamboo fiber with a beating degree of 40°SR is used to replace the modified bamboo fiber, and the rest of the operations are the same as those in Example 7 above, which will not be elaborated here.

[0141] Comparative Example 4

[0142] A production method of high-strength aluminized base paper:

[0143] The difference between this and Example 7 above is only that in step S5, hydroxypropyl methylcellulose solution is used as the surface treatment agent and silica sol is not added, and the rest of the operations are the same as those in Example 7 above, which will not be elaborated here.

[0144] Comparative Example 5

[0145] A production method of high-strength aluminized base paper:

[0146] The difference between this and Example � above is only that in step S5, silica sol is used as the surface treatment agent and hydroxypropyl methylcellulose solution is not added, and the rest of the operations are the same as those in Example 7 above, which will not be elaborated here.

[0147] Comparative Example 6

[0148] A production method of high-strength aluminized base paper:

[0149] The difference between this and Example 7 above is only that in step S6, the drying temperature is 80 °C, and the rest of the operations are the same as those in Example 7 above, which will not be elaborated here.

[0150] Test Example 1

[0151] The aluminized base paper prepared in the above Examples 4-7 and Comparative Examples 1-6 was subjected to performance testing, and the results are shown in Table 1 below:

[0152] Table 1 Performance test results of aluminized base paper

[0153]

[0154] The embodiments of the present application have been described above. Without conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them fall within the protection scope of the present application.

Claims

1. A production method of high-strength aluminized base paper, characterized in that, Including the steps: S1, beating: First, loosen and dilute the long fiber pulp board and short fiber pulp board separately to obtain long fiber primary pulp and short fiber primary pulp with a concentration of 4-6%. Then, beat the long fiber primary pulp and short fiber primary pulp respectively. Among them, the beating degree of the long fiber is 40-50°SR, and the beating degree of the short fiber is 20-30°SR; S2, adding additives: Add modified inorganic filler, cationic starch and retention aid to the short fiber pulp, and stir evenly. Among them, the dosage of the modified inorganic filler is 10-15% of the weight of the short fiber absolute dry pulp, the dosage of the cationic starch is 0.3-0.5% of the weight of the short fiber absolute dry pulp, and the dosage of the retention aid is 0.01-0.3% of the weight of the short fiber absolute dry pulp; S3, pulp mixing: Mix the long fiber pulp and short fiber pulp according to the weight ratio of long fiber pulp to short fiber pulp of 20-30:70-80. Then, add 5-8% of modified bamboo fiber based on the weight of the absolute dry pulp, and stir evenly to make a mixed pulp; S4, papermaking on the wire: When papermaking, the wire-loading concentration of the pulp is 0.4-0.9%, and the machine speed is 300-500 m / min; S5, Spraying surface treatment agent: Spraying a surface treatment agent on the paper surface, and the coating amount of the surface treatment agent is 3-5 g / m 2 ; S6, Paper drying, calendering and coiling: After being pressed, the wet paper sheet enters the drying device for drying. The drying temperature is 150~250°C, the drying time is not less than 30s, and then it undergoes 1~3 passes of calendering with a calendering pressure of 500~3000kN / m 2 , and finally it is coiled to obtain the base paper for aluminizing; In the step S3, the preparation process of the modified bamboo fiber is as follows: First, cut and crush the bamboo into particulate matter with a particle size ≤ 0.5 cm; Then add an appropriate amount of water, stir and soak at room temperature for 2-6 h. After soaking, let it stand to make the mixed system stratified. Collect the floating matter A on the upper layer and the precipitate B on the lower layer. Dry the floating matter A on the upper layer and set it aside; Mix the precipitate B on the lower layer with an appropriate amount of water to obtain a dispersion of precipitate B. Then add the dispersion of precipitate B to a ball mill, and fill the ball mill with an inert gas to displace the air therein. Then, at a rotation speed of 300-1000 rpm, ball mill for 10-30 min. After the ball milling treatment, filter, wash with water and dry the material to obtain modified bamboo fiber.

2. The production method of the high-strength aluminized base paper according to claim 1, characterized in that, In the dispersion of precipitate B, the content of precipitate B is 20-40%.

3. The production method of the high-strength aluminized base paper according to claim 1, characterized in that, The preparation process of the modified bamboo fiber further includes: After obtaining the precipitate B on the lower layer, first add the precipitate B on the lower layer to a 10-20% sodium hydroxide aqueous solution, boil for 10-30 min, then filter and wash with water; Then put it into 5-10% hydrogen peroxide, soak at 50-70 °C for 30-60 min, filter and wash with water; Then mix the washed precipitate B on the lower layer with an appropriate amount of water to obtain a dispersion of precipitate B, and add the dispersion of precipitate B to a ball mill for ball milling treatment to obtain modified bamboo fiber.

4. The production method of the high-strength aluminum-plated base paper according to claim 1, characterized in that, In the step S2, by weight, the modified inorganic filler includes: 70-80 parts of inorganic filler; 20-30 parts of the floating matter A.

5. The production method of the high-strength aluminized base paper according to claim 4, characterized in that The inorganic filler is one or more of calcium carbonate, talcum powder, and silicate.

6. The production method of the high-strength aluminized base paper according to claim 4, characterized in that, The preparation method of the modified inorganic filler includes: First, take the formula amount of inorganic filler and float A. After mixing the two evenly, place them in a ball mill. At a rotational speed of 100 - 500 revolutions per minute, ball mill for a certain period of time until the particle size of the mixed powder ≤ 1 μm, then the ball milling treatment is completed to obtain the modified inorganic filler.

7. The production method of the high-strength aluminized base paper according to claim 1, characterized in that, In the step S5, the surface treatment agent is a mixture of hydroxypropyl methylcellulose solution and silica sol.

8. The production method of the high-strength aluminized base paper according to claim 7, characterized in that, The concentration of the hydroxypropyl methylcellulose solution is 20 - 30%, and the content of nano-silica in the silica sol is 5 - 15%; the surface treatment agent is formed by mixing the hydroxypropyl methylcellulose solution and silica sol according to a weight ratio of 1:(0.5 - 1).

9. The production method of the high-strength aluminized base paper according to claim 1, characterized in that, In the step S6, the paper is calendered twice. Among them, the pressure of the first calendering is 1000 - 3000 kN / m 2 , and the pressure of the second calendering is 500 - 1000 kN / m 2 .

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