Marker pen double-sided drawing paper and production process thereof

Abstract

The invention relates to the field of drawing paper, and particularly discloses mark pen double-sided drawing paper and a production process thereof. The mark pen double-sided drawing paper comprises a first body paper layer, a coating layer and a second body paper layer which are arranged in sequence, the coating layer is formed by coating a coating solution according to the coating weight of 1-5 g / m < 2 >, and the coating solution is a chitosan-sodium alginate-sodium alginate propylene glycol ester coating solution. By designing a composite structure of the first body paper layer, the coating layer consisting of chitosan-sodium alginate-sodium alginate propylene glycol ester and the second body paper layer, the paper for double-sided drawing by the mark pen has the advantages that the anti-permeation performance of the paper is remarkably improved, ink is prevented from permeating to the other side of the paper, the feasibility of double-sided drawing is ensured, and the paper is suitable for popularization and application. Meanwhile, the ink permeation speed and the drying speed are high, the brightness and uniform distribution of the ink of the mark pen are kept, and the drawing effect is more ideal.

Description

Technical Field

[0001] The present application relates to the field of drawing paper, and more specifically, to a double-sided drawing paper for a marker pen and a production process thereof. Background Art

[0002] In artistic creation and daily painting, markers are widely favored for their rich colors, easy operation, and quick drying. However, as people's requirements for painting quality continue to increase, traditional paper faces many challenges when using markers for painting. Due to the characteristics of the material itself, traditional paper is prone to ink penetration too quickly, especially when using ink containing alcohol. This phenomenon is particularly obvious. The ink often penetrates too quickly, the ink is difficult to dry, and even penetrates to the other side of the paper. This not only affects the painting effect, but also limits the possibility of artists creating on the other side of the paper, thereby reducing the artistic value and appreciation of the work.

[0003] In order to deal with the above problems, some papers specially used for marker pen painting have appeared on the market. For example, the Chinese patent with the announcement number CN 112095363A discloses a special paper for marker pen painting, which prevents ink penetration by coating a waterproof coating on the surface of the paper. The waterproof coating is mainly composed of water-soluble acrylic resin, water-soluble C benzene emulsion, wax emulsion, water and additives, which can effectively improve the anti-penetration performance of the paper and make the color more vivid and uniform. In addition, some other methods are also widely used, such as increasing the thickness of the paper, changing the fiber arrangement of the paper, etc. These methods have improved the water absorption and anti-permeability of the paper to a certain extent.

[0004] Although existing technical means can alleviate the ink penetration problem to a certain extent, they still have some shortcomings, especially for inks containing alcohol components. The waterproof coating in the existing technology often makes the ink penetration speed too slow and the drying time is prolonged, which seriously affects the painter's experience and efficiency. Summary of the invention

[0005] In order to solve the above technical problems, the present application provides a double-sided drawing paper for markers, which has fast ink penetration and drying and will not penetrate to the other side of the paper, and a production process thereof, so that if necessary, the back side can continue to be painted with a marker.

[0006] In the first aspect, the present application provides a double-sided drawing paper for a marker pen, which adopts the following technical solution: A double-sided drawing paper for a marker pen comprises a first base paper layer, a coating layer and a second base paper layer arranged in sequence, wherein the coating layer is coated with a coating liquid at a rate of 1-5 g / m 2 The coating liquid is chitosan-sodium alginate-sodium alginate propylene glycol ester coating liquid.

[0007] By adopting the above technical solution, the structural design of the first base paper layer, the coating layer and the second base paper layer not only utilizes the chitosan-sodium alginate-sodium alginate propylene glycol ester coating liquid to make the coating layer have good anti-permeability, effectively improving the double-sided painting performance of the paper, but also solves the problems of slow ink penetration and slow drying caused by traditional waterproof coatings. In addition, the double-sided drawing paper for marker pens can also maintain the brightness and uniform distribution of marker pen ink, making the painting effect more ideal.

[0008] Preferably, the weight ratio of chitosan, sodium alginate and sodium alginate propylene glycol ester in the chitosan-sodium alginate-sodium alginate propylene glycol ester coating liquid is (3-5):1:(1-2).

[0009] The chitosan-sodium alginate-sodium alginate propylene glycol ester coating liquid of the present application is prepared by the following method: The chitosan is dispersed in a glacial acetic acid solution and heated in a water bath with stirring to obtain a chitosan solution. The chitosan solution, a sodium alginate aqueous solution, a sodium alginate propylene glycol aqueous solution and ferulic acid are mixed and magnetically stirred. Glycerol is then added, and the magnetic stirring is continued. Then, ultrasonic dispersion is performed to obtain a uniform and stable chitosan-sodium alginate-sodium alginate propylene glycol coating solution.

[0010] By adopting the above technical scheme, chitosan, sodium alginate and sodium alginate propylene glycol ester are matched in a certain proportion to form a uniform and dense coating layer on the surface of the second base paper. The uniform and dense coating layer can effectively prevent the ink from quickly penetrating into the inside of the paper and causing the back to be soaked, thereby improving the double-sided painting performance of the paper. At the same time, the coating liquid can also improve the durability and strength of the paper, ensuring that the painting works are not easy to fade or deform during long-term storage. In addition, the coating liquid can also make the colors drawn by the marker pen more vivid, saturated, and easy to superimpose, thereby improving the artistic expression of the painting. Specifically, chitosan has good film-forming properties and biocompatibility, which can enhance the strength and durability of the paper; the thickening properties of sodium alginate can adjust the viscosity of the coating liquid, making it easier to apply; sodium alginate propylene glycol ester further enhances the anti-permeability and quick-drying properties of the coating layer, so that the ink can be fully absorbed and fixed on the paper in a short time. Therefore, the uniform and dense coating layer formed by the mixture of the three not only improves the double-sided painting effect of the paper, but also significantly improves the painting experience of the painter.

[0011] Preferably, the weight ratio of chitosan, sodium alginate and sodium alginate propylene glycol ester in the chitosan-sodium alginate-sodium alginate propylene glycol ester coating liquid is 4:1:1.5.

[0012] By adopting the above technical scheme, the present application further optimizes the weight ratio of chitosan, sodium alginate and sodium alginate propylene glycol ester, which can give full play to the synergistic effect among the three, further improve the double-sided painting effect of paper, and enhance the strength and durability of paper.

[0013] Preferably, a nanocellulose layer is further provided between the coating layer and the second base paper layer.

[0014] Preferably, the nanocellulose layer is formed by coating a nanocellulose suspension having a concentration of 0.5-2 wt % with a coating thickness of 0.4-0.6 mm.

[0015] The nanocellulose suspension of the present application is prepared by the following method: The bleached eucalyptus pulp (absolutely dry) is dispersed in water to obtain a suspension, and then sodium bromide, 2,2,6,6-tetramethylpiperidin-1-oxyl free radical (TEMPO) and sodium hypochlorite solution are sequentially added to the suspension while stirring to mix and react. During the reaction, the pH value of the system is maintained at 9.8-10.0. After the reaction is completed, the reaction product is centrifuged and washed with deionized water, and then subjected to high-pressure homogenization and rotary evaporation to obtain a nanocellulose suspension with a concentration of 0.5-2wt%.

[0016] Through the above technical scheme, the present application utilizes the excellent film-forming property of nanocellulose to form a thin film on the surface of the second base paper to cover the surface of the second base paper, and then the coating liquid continues to form a dense film on the basis of the nanocellulose film. On the one hand, the nanocellulose film can be used to reduce the penetration of chitosan in the coating liquid into the interior of the second base paper so that the chitosan can fully exert its effect. On the other hand, the synergistic effect of the nanocellulose layer and the coating layer can be fully exerted to further enhance the double-sided painting performance and mechanical properties of the paper.

[0017] In a second aspect, the present application provides a production process for double-sided drawing paper for a marker pen, which adopts the following technical solution: A production process for double-sided drawing paper for a marker pen, comprising the following steps: S1, base paper production, mixing and beating wood pulp fiber raw materials to obtain pulp, passing the pulp through the screen to form, dehydrating the screen, dehydrating by pressing, drying before surface sizing, surface sizing, drying after surface sizing, calendering, and winding to obtain the base paper of the mark paper; S2, coating processing, the base paper is divided into two parts in equal amounts to obtain a first base paper and a second base paper, and a chitosan-sodium alginate-sodium alginate propylene glycol ester coating liquid is coated on the surface of the second base paper, and the coating amount is 1-5g / m 2 , and then drying to obtain a second base paper with a coating layer; S3, hot pressing and laminating, laminating and forming the first base paper and the second base paper with the coating layer, cooling, rewinding, and slitting to obtain double-sided drawing paper for marker pens.

[0018] Through the above technical scheme, first, in the production process of base paper, by mixing and beating the wood pulp fiber raw materials, forming on the net, dehydrating the net, squeezing and dehydrating, drying before surface sizing, surface sizing, drying after surface sizing, calendering, winding and other steps, it is ensured that the produced double-sided drawing paper for markers has high flatness and strength. Secondly, in the coating process, the base paper is divided into two parts in equal amounts, respectively as the first base paper and the second base paper, wherein the surface of the second base paper is coated with chitosan-sodium alginate-sodium alginate propylene glycol ester coating liquid, and then through composite molding, the first base paper is tightly combined with the second base paper with a coating layer to form a stable structure, so that the coating layer can not only improve the anti-seepage performance of the paper, so that the ink will not penetrate into the other side of the paper, but also make the ink fully absorbed and fixed on the paper in a short time, and at the same time make the ink maintain good color brightness and layering on the paper, not only achieving a double-sided painting effect, but also making the ink penetrate fast and dry fast, significantly improving the painting experience and efficiency. The entire production process of this application is simple and efficient, and is suitable for large-scale industrial production.

[0019] Preferably, in the coating process, a nanocellulose suspension having a concentration of 0.5-2 wt% is firstly coated on the surface of the second base paper with a coating thickness of 0.4-0.6 mm, and then a chitosan-sodium alginate-sodium alginate propylene glycol ester coating liquid is applied after drying.

[0020] Through the above technical scheme, firstly, a nanocellulose suspension with a concentration of 0.5-2wt% is coated on the surface of the second base paper to form a nanocellulose layer, which can effectively improve the strength and tear resistance of the paper by using the nanocellulose layer, and at the same time enhance the smoothness of the surface of the second base paper, so that the subsequent coating liquid is more uniform. Secondly, chitosan-sodium alginate-sodium alginate propylene glycol ester coating liquid is coated on this basis, which can exert the synergistic effect of the coating layer and the nanocellulose layer, improve the double-sided painting performance and mechanical properties of the paper, and at the same time, the nanocellulose layer can reduce the penetration of chitosan in the coating liquid into the interior of the second base paper, so that the chitosan can fully play its role, and further improve the double-sided painting performance and mechanical properties of the paper.

[0021] Preferably, the concentration of the glue solution for surface sizing is 4-6wt%, and the glue solution includes polyvinyl alcohol and cationic starch, and the weight ratio of the polyvinyl alcohol to the cationic starch is (1-2):1.

[0022] Through the above technical solution, the present application uses cationic starch and polyvinyl alcohol as glue, which can make the cationic starch adsorbed on the negatively charged fiber surface through wet chemical method to form a stronger surface oriented film. The test results show that compared with oxidized starch, cationic starch has better water resistance. Using it in combination with polyvinyl alcohol for sizing not only increases the amount of starch adsorption on the paper surface, but also improves the opacity, whiteness, glossiness and other properties of the paper.

[0023] Preferably, the cationic starch comprises cationic amylose and cationic amylopectin in a weight ratio of 1:(3.5-4.5).

[0024] Optionally, the degree of substitution of the cationic starch is 0.04-0.4.

[0025] Preferably, the degree of substitution of the cationic starch is 0.08.

[0026] Through the above technical scheme, the present application adopts the above-mentioned ratio of cationic amylose and cationic amylopectin mixed and used, which can satisfy the low degree of substitution (degree of substitution is 0.08) and low cost, and at the same time, the two can be distributed on the surface of paper fibers and between fibers, so that the bonding between fibers is more firm, and the bonding force between fibers is increased, thereby greatly improving the strength and water resistance of paper. Among them, the cationic amylose and cationic amylopectin of the present application are quaternized ammonium ammonium starch and quaternized amylopectin, and the quaternary ammonium substitution degree ranges from 0.04 to 0.4.

[0027] In summary, this application has the following beneficial technical effects: 1. The double-sided drawing paper for marker pens of the present application has a composite structure of a first base paper layer, a coating layer composed of chitosan-sodium alginate-sodium alginate propylene glycol ester, and a second base paper layer, which significantly improves the anti-penetration performance of the paper, prevents the ink from penetrating to the other side of the paper, ensures the feasibility of double-sided drawing, and at the same time makes the ink penetration speed and drying speed faster, and maintains the vividness and uniform distribution of the marker pen ink, making the drawing effect more ideal; 2. The present application adds a nanocellulose layer between the coating layer and the second base paper layer. On the one hand, the nanocellulose film can be used to reduce the penetration of chitosan in the coating liquid into the second base paper so that the chitosan can fully exert its effect. On the other hand, the synergistic effect of the nanocellulose layer and the coating layer can be fully exerted to further enhance the double-sided painting performance and mechanical properties of the paper. 3. The present application adopts a mixture of cationic amylose and cationic amylopectin, which can significantly improve the strength and water resistance of paper while meeting the requirements of low degree of substitution (degree of substitution is 0.08), i.e., low cost; 4. The entire production process of the double-sided marker pen drawing paper of the present application is simple and efficient, and is suitable for large-scale industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of double-sided drawing paper for markers prepared in Examples 1.1-1.5 of the present application; Figure 2 It is a schematic diagram of the structure of the double-sided drawing paper for markers prepared in Examples 2.1-2.5 of the present application; In the figure, 1, first base paper layer; 2, second base paper layer; 3, coating layer; 4, nanocellulose layer. DETAILED DESCRIPTION

[0029] The present application is further described in detail below with reference to the embodiments.

[0030] The raw materials used in this application are all commercially available products unless otherwise specified; Among them, the CAS number of 2,2,6,6-tetramethylpiperidin-1-oxyl free radical (TEMPO) is 2564-83-2, the molecular formula is C9H18NO, the appearance is red crystal, the content is ≥99.0%, and the water content is ≤1.0%; Cationic amylose and cationic amylopectin are obtained by activating amylose and amylopectin separated and purified from corn starch with sodium hydroxide at 65°C, and then reacting with a cationic etherifying agent 3-chloro-2-hydroxypropyltrimethylammonium chloride to obtain quaternized amylose and amylopectin with different degrees of substitution (0.04-0.4). The purity of amylose separated and purified from corn starch is 92.4±1.5%, and the weight average molecular weight is 3.72×10 4 Da, the purity of amylopectin is 95.3±1.6%, and the weight average molecular weight is 2.03×10 4 Da.

[0031] Preparation Example 1.1 Chitosan-sodium alginate-sodium alginate propylene glycol ester coating liquid was prepared by the following method: a. Disperse 3 kg of chitosan in glacial acetic acid solution and heat in a water bath at 70°C with stirring for 1 h to obtain a chitosan solution with a mass concentration of 3%; add 1 kg of sodium alginate into deionized water to obtain a sodium alginate aqueous solution with a mass fraction of 1 wt%; add 2 kg of sodium alginate propylene glycol ester into deionized water to obtain a sodium alginate propylene glycol ester aqueous solution with a mass fraction of 2 wt%; b. The chitosan solution, sodium alginate aqueous solution and sodium alginate propylene glycol aqueous solution are compounded, and then 0.1 kg of ferulic acid is added thereto and magnetically stirred for 30 minutes, followed by adding 0.5 kg of glycerol, and the magnetic stirring is continued for 30 minutes, and then ultrasonically dispersed for 10 minutes to obtain a uniform and stable chitosan-sodium alginate-sodium alginate propylene glycol coating solution.

[0032] Preparation Example 1.2 Chitosan-sodium alginate-sodium alginate propylene glycol ester coating liquid was prepared by the following method: a. Disperse 5 kg of chitosan in glacial acetic acid solution and heat in a water bath at 70°C with stirring for 1 h to obtain a chitosan solution with a mass concentration of 5%; add 1 kg of sodium alginate into deionized water to obtain a sodium alginate aqueous solution with a mass fraction of 1 wt%; add 1 kg of sodium alginate propylene glycol ester into deionized water to obtain a sodium alginate propylene glycol ester aqueous solution with a mass fraction of 1 wt%; b. The chitosan solution, sodium alginate aqueous solution and sodium alginate propylene glycol aqueous solution are compounded, and then 0.1 kg of ferulic acid is added thereto and magnetically stirred for 30 minutes, followed by adding 0.5 kg of glycerol, and the magnetic stirring is continued for 30 minutes, and then ultrasonically dispersed for 10 minutes to obtain a uniform and stable chitosan-sodium alginate-sodium alginate propylene glycol coating solution.

[0033] Preparation Example 1.3 Chitosan-sodium alginate-sodium alginate propylene glycol ester coating liquid was prepared by the following method: a. Disperse 4 kg of chitosan in glacial acetic acid solution and heat in a water bath at 70° C. with stirring for 1 h to obtain a chitosan solution with a mass concentration of 4%; add 1 kg of sodium alginate to deionized water to obtain a sodium alginate aqueous solution with a mass fraction of 1 wt%; add 1.5 kg of sodium alginate propylene glycol ester to deionized water to obtain a sodium alginate propylene glycol ester aqueous solution with a mass fraction of 1.5 wt%; b. Compound the chitosan solution, the sodium alginate aqueous solution and the sodium alginate propylene glycol ester aqueous solution, add 0.1 kg of ferulic acid thereto and stir magnetically for 30 min, then add 0.5 kg of glycerol, continue to stir magnetically for 30 min, and then disperse ultrasonically for 10 min to obtain a uniform and stable chitosan-sodium alginate-sodium alginate propylene glycol ester coating solution.

[0034] Comparative Preparation Example 1.1 The difference from Preparation Example 1.3 is that no sodium alginate propylene glycol is added, the amount of sodium alginate used is 2.5 kg, and the rest is the same as Preparation Example 1.3.

[0035] Comparative Preparation Example 1.2 The difference from Preparation Example 1.3 is that sodium alginate is not added, the amount of sodium alginate propylene glycol ester used is 2.5 kg, and the rest is the same as Preparation Example 1.3.

[0036] Comparative Preparation Example 1.3 The difference from Preparation Example 1.3 is that 1 kg of sodium alginate and 1.5 kg of sodium alginate propylene glycol ester are replaced by 2.5 kg of sodium carboxymethyl cellulose, and the rest is the same as Preparation Example 1.3.

[0037] Comparative Preparation Example 1.4 The difference from Preparation Example 1.3 is that 4 kg of chitosan is replaced by 4 kg of sodium carboxymethyl cellulose, and the rest is the same as Preparation Example 1.3.

[0038] Preparation Example 2.1 The nanocellulose suspension was prepared by the following method: 4 kg of absolutely dry bleached eucalyptus pulp is dispersed in water to obtain a suspension with a concentration of 1 wt%, and then 0.4 kg of sodium bromide and 0.06 kg of 2,2,6,6-tetramethylpiperidin-1-oxyl free radical (TEMPO) are added to the suspension in sequence while stirring, and a sodium hypochlorite solution (sodium hypochlorite dosage is 24 mol) is poured into the calibrated volume to mix and react. During the reaction, the pH value of the system is maintained at 9.8-10.0 with a 0.5 mol / L NaOH solution. After the reaction is completed, the reaction product is centrifuged and washed with deionized water at a speed of 5500 rpm, and then homogenized 3-5 times under a high pressure of 15000 PSI, and then rotary evaporated to obtain a nanocellulose suspension with a concentration of 0.5 wt%.

[0039] Preparation Example 2.2 The nanocellulose suspension was prepared by the following method: 4 kg of absolutely dry bleached eucalyptus pulp is dispersed in water to obtain a suspension with a concentration of 1 wt%, and then 0.4 kg of sodium bromide and 0.06 kg of 2,2,6,6-tetramethylpiperidin-1-oxyl free radical (TEMPO) are added to the suspension in sequence while stirring, and a sodium hypochlorite solution (sodium hypochlorite dosage is 24 mol) is poured into the calibrated volume to mix and react. During the reaction, the pH value of the system is maintained at 9.8-10.0 with a 0.5 mol / L NaOH solution. After the reaction is completed, the reaction product is centrifuged and washed with deionized water at a speed of 5500 rpm, and then homogenized 3-5 times under a high pressure of 15000 PSI, and then rotary evaporated to obtain a nanocellulose suspension with a concentration of 1.5 wt%.

[0040] Preparation Example 2.3 The nanocellulose suspension was prepared by the following method: 4 kg of absolutely dry bleached eucalyptus pulp is dispersed in water to obtain a suspension with a concentration of 1 wt%, and then 0.4 kg of sodium bromide and 0.06 kg of 2,2,6,6-tetramethylpiperidin-1-oxyl free radical (TEMPO) are added to the suspension in sequence while stirring, and a sodium hypochlorite solution (sodium hypochlorite dosage is 24 mol) is poured into the calibrated volume to mix and react. During the reaction, the pH value of the system is maintained at 9.8-10.0 with a 0.5 mol / L NaOH solution. After the reaction, the reaction product is centrifuged and washed with deionized water at a speed of 5500 rpm, and then homogenized 3-5 times under a high pressure of 15000 PSI, and then rotary evaporated to obtain a nanocellulose suspension with a concentration of 2 wt%.

[0041] Example 1.1 A production process for double-sided drawing paper for marker pens, comprising the following steps: S1, base paper production, softwood pulp and hardwood pulp are mixed and beaten to obtain pulp (the weight ratio of softwood pulp to hardwood pulp is 3:7), the beating degree is 40°SR, the pulp is formed by screen, dewatered by the screen, pressed and dehydrated, dried before surface sizing, surface sizing, dried after surface sizing, calendered, and rolled to obtain 55g / m 2 Mark paper base paper; wherein the surface sizing adopts a 4wt% glue solution, the sizing amount is 1.8% of the weight of the slurry, and the weight ratio of polyvinyl alcohol and oxidized starch in the glue solution is 1:1; S2, coating processing, the base paper is divided into two parts in equal amounts to obtain a first base paper and a second base paper, and the surface of the second base paper is coated with the chitosan-sodium alginate-sodium alginate propylene glycol ester coating liquid prepared in Preparation Example 1.1, and the coating amount is 1g / m 2 , and then drying to obtain a second base paper with a coating layer; S3, hot pressing and laminating, laminating the first base paper and the second base paper with the coating layer, cooling, rewinding, and slitting to obtain 120g / m 2 Double-sided drawing paper for markers.

[0042] Example 1.2 A production process for double-sided drawing paper for marker pens, comprising the following steps: S1, base paper production, softwood pulp and hardwood pulp are mixed and beaten to obtain pulp (the weight ratio of softwood pulp to hardwood pulp is 3:7), the beating degree is 40°SR, the pulp is formed by screen, dewatered by the screen, pressed and dehydrated, dried before surface sizing, surface sizing, dried after surface sizing, calendered, and rolled to obtain 55g / m 2Mark paper base paper; wherein the surface sizing adopts a 6wt% glue solution, the sizing amount is 1.8% of the slurry weight, and the weight ratio of polyvinyl alcohol and oxidized starch in the glue solution is 2:1; S2, coating processing, the base paper is divided into two parts in equal amounts to obtain a first base paper and a second base paper, and the chitosan-sodium alginate-sodium alginate propylene glycol ester coating liquid prepared in Preparation Example 1.2 is coated on the surface of the second base paper, and the coating amount is 5g / m 2 , and then drying to obtain a second base paper with a coating layer; S3, hot pressing and laminating, laminating the first base paper and the second base paper with the coating layer, cooling, rewinding, and slitting to obtain 120g / m 2 Double-sided drawing paper for markers.

[0043] Example 1.3 A production process for double-sided drawing paper for marker pens, comprising the following steps: S1, base paper production, softwood pulp and hardwood pulp are mixed and beaten to obtain pulp (the weight ratio of softwood pulp to hardwood pulp is 3:7), the beating degree is 40°SR, the pulp is formed by screen, dewatered by the screen, pressed and dehydrated, dried before surface sizing, surface sizing, dried after surface sizing, calendered, and rolled to obtain 55g / m 2 Mark paper base paper; wherein the surface sizing adopts a 3wt% glue solution, the sizing amount is 1.8% of the weight of the slurry, and the weight ratio of polyvinyl alcohol and oxidized starch in the glue solution is 1.5:1; S2, coating processing, the base paper is divided into two parts in equal amounts to obtain a first base paper and a second base paper, and the surface of the second base paper is coated with the chitosan-sodium alginate-sodium alginate propylene glycol ester coating liquid prepared in Preparation Example 1.3, and the coating amount is 3g / m 2 , and then drying to obtain a second base paper with a coating layer; S3, hot pressing and laminating, laminating the first base paper and the second base paper with the coating layer, cooling, rewinding, and slitting to obtain 120g / m 2 Double-sided drawing paper for markers.

[0044] Example 1.4 A production process for double-sided drawing paper for marker pens, which differs from Example 1.3 in that: in step S2, the chitosan-sodium alginate-sodium alginate propylene glycol ester coating liquid prepared in Preparation Example 1.3 is replaced by the chitosan-sodium alginate-sodium alginate propylene glycol ester coating liquid prepared in Preparation Example 1.1, and the rest is the same as Example 1.3.

[0045] Example 1.5 A production process for double-sided drawing paper for marker pens, which differs from Example 1.3 in that: in step S2, the chitosan-sodium alginate-sodium alginate propylene glycol ester coating liquid prepared in Preparation Example 1.3 is replaced by the chitosan-sodium alginate-sodium alginate propylene glycol ester coating liquid prepared in Preparation Example 1.2, and the rest is the same as Example 1.3.

[0046] Example 2.1 A production process for double-sided drawing paper for marker pens, which differs from Example 1.3 in that: in step S2, the nanocellulose suspension prepared in Preparation Example 2.1 is first coated on the surface of the second base paper with a coating thickness of 0.4 mm, and then coated with chitosan-sodium alginate-sodium alginate propylene glycol ester coating liquid after drying, and the rest is the same as Example 1.3.

[0047] Example 2.2 A production process for double-sided drawing paper for marker pens, which differs from Example 1.3 in that: in step S2, the nanocellulose suspension prepared in Preparation Example 2.2 is first coated on the surface of the second base paper with a coating thickness of 0.5 mm, and then coated with chitosan-sodium alginate-sodium alginate propylene glycol ester coating liquid after drying, and the rest is the same as Example 1.3.

[0048] Example 2.3 A production process for double-sided drawing paper for marker pens, which differs from Example 1.3 in that: in step S2, the nanocellulose suspension prepared in Preparation Example 2.3 is first coated on the surface of the second base paper with a coating thickness of 0.6 mm, and then coated with chitosan-sodium alginate-sodium alginate propylene glycol ester coating liquid after drying, and the rest is the same as Example 1.3.

[0049] Example 2.4 A production process for double-sided drawing paper for marker pens, which is different from Example 2.2 in that the nanocellulose suspension prepared in Preparation Example 2.2 is replaced by the nanocellulose suspension prepared in Preparation Example 2.1, and the rest is the same as Example 2.2.

[0050] Example 2.5 A production process for double-sided drawing paper for marker pens, which is different from Example 2.2 in that the nanocellulose suspension prepared in Preparation Example 2.2 is replaced by the nanocellulose suspension prepared in Preparation Example 2.3, and the rest is the same as Example 2.2.

[0051] Example 3.1 A production process for double-sided drawing paper for marker pens, which differs from Example 1.3 in that the oxidized starch in the glue solution in step S1 is replaced with cationic straight-chain starch with a quaternary ammonium substitution degree of 0.4, and the rest is the same as Example 1.3.

[0052] Example 3.2 A production process for double-sided drawing paper for marker pens, which differs from Example 1.3 in that the oxidized starch in the glue solution in step S1 is replaced with cationic amylopectin with a quaternary ammonium substitution degree of 0.2, and the rest is the same as Example 1.3.

[0053] Example 3.3 A production process for double-sided drawing paper for marker pens, which differs from Example 1.3 in that the oxidized starch in the glue solution in step S1 is replaced with cationic amylose and cationic amylopectin in a weight ratio of 1:3.5, and the quaternary ammonium substitution degree of both is 0.08, and the rest is the same as Example 1.3.

[0054] Example 3.4 A production process for double-sided drawing paper for marker pens, which differs from Example 1.3 in that the oxidized starch in the glue solution in step S1 is replaced with cationic amylose and cationic amylopectin in a weight ratio of 1:4, and the quaternary ammonium substitution degree of both is 0.08, and the rest is the same as Example 1.3.

[0055] Example 3.5 A production process for double-sided drawing paper for marker pens, which differs from Example 1.3 in that the oxidized starch in the glue solution in step S1 is replaced with cationic amylose and cationic amylopectin in a weight ratio of 1:4.5, and the quaternary ammonium substitution degree of both is 0.08, and the rest is the same as Example 1.3.

[0056] Comparative Examples 1-4 The difference from Example 1.3 is that the chitosan-sodium alginate-sodium alginate propylene glycol ester coating liquid prepared in Preparation Example 1.3 in step S2 is replaced by the coating liquids prepared in Comparative Example Preparation Examples 1.1-1.4 respectively, and the rest is the same as Example 1.3.

[0057] Performance Testing The papers prepared in the above-mentioned Examples 1.1-3.5 and Comparative Examples 1-4 were tested for relevant technical indicators, and the results are shown in Table 1, wherein the surface absorption weight was measured with reference to the Crimp method in GB / T 1540 "Determination of the absorbency of paper and paperboard"; the opacity was measured with reference to the diffuse reflection method in GB / T 1543 "Determination of the opacity of paper and paperboard"; the tear length (vertical and horizontal average) was measured with reference to the constant rate stretching method in GB / T 12914 "Determination of the tensile strength of paper and paperboard"; the water contact angle was tested on an FTA200 dynamic contact angle analyzer with a contact time of 0.1 s; at the same time, an oil-based marker was used to draw a horizontal line on the paper surface in practice, and when drawing the horizontal line, it was observed whether there was ink penetration on the back of the paper, and then it was wiped with a finger immediately to observe whether there would be ink scratches, and if not, it means that the ink penetration speed is fast and the drying time is short.

[0058] Table 1 Performance test results Data Analysis: As can be seen from Table 1, the surface absorption weight of the double-sided drawing paper for marker pens prepared in Examples 1.1-1.5 of the present application is 28.2-31.4 g / m 2 , opacity is 95.8-96.5%, tear length is 3618-3635km, water contact angle is 102-106°, the test results show that the double-sided drawing paper with marker pen prepared in Examples 1.1-1.5 of the present application has good surface absorption performance, is suitable for oily marker pen painting, and also has good opacity, the ink painted on the front side will not penetrate into the other side of the paper, and has good mechanical properties and hydrophobic properties. In practice, a horizontal line is drawn on the paper with a marker pen, and there is no ink penetration on the back side. Immediately wipe it with a finger, and no ink scratches appear. Among them, by comparing the data results of Examples 1.3-1.5, it can be found that Example 1.3 further optimizes the ratio of chitosan, sodium alginate and sodium alginate propylene glycol ester in the coating liquid, which can further improve the coating liquid The enhancement effect on paper performance.

[0059] The difference between Examples 2.1-2.5 and Example 1.3 is that a nanocellulose layer is first covered on the surface of the second base paper, and then a coating layer is covered on the surface of the nanocellulose layer. As can be seen from Table 1, the properties of the paper prepared in Examples 2.2-2.5 are better than those in Example 1.3. The test results show that adding nanocellulose between the coating layer and the second base paper layer can further improve the properties of the paper. Among them, by comparing the data results of Example 2.2 and Examples 2.4-2.5, it can be found that Example 2.2 further optimizes the mass concentration of the nanocellulose suspension, which can further enhance the reinforcing effect of the nanocellulose layer on the paper.

[0060] The difference between Examples 3.1-3.5 and Example 1.3 is that cationic starch is used instead of oxidized starch. As can be seen from Table 1, the various properties of the paper prepared by Examples 3.1-3.5 are better than those of Example 1.3, especially the water contact angle is significantly increased. The test results show that compared with oxidized starch, cationic starch can further enhance the water resistance of the sizing agent and other properties, thereby optimizing the various properties of the paper. Among them, by comparing the data results of Examples 3.1-3.2 and Examples 3.3-3.5, it can be found that Examples 3.3-3.5 further use a mixture of cationic amylose and cationic amylopectin, which can achieve excellent performance with a low degree of substitution and reduce costs.

[0061] The difference between Comparative Examples 1-4 and Example 1.3 is that the coating liquid does not use a mixture of chitosan, sodium alginate, and sodium alginate propylene glycol ester. As can be seen from Table 1, the performance of the paper prepared in Comparative Examples 1-4 is worse than that of Example 1.3. The test results show that the mixture of chitosan, sodium alginate, and sodium alginate propylene glycol ester can give full play to the synergistic effect between each other, so that the coating layer forms a dense structure, thereby improving the reinforcing effect of the coating layer on the paper.

[0062] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A double-sided drawing paper for a marker pen, characterized in that: The invention comprises a first base paper layer, a coating layer and a second base paper layer which are arranged in sequence, wherein the coating layer is coated with a coating liquid at a rate of 1-5 g / m 2 The coating liquid is chitosan-sodium alginate-sodium alginate propylene glycol ester coating liquid.

2. The double-sided drawing paper for a marker pen according to claim 1, characterized in that: The weight ratio of chitosan, sodium alginate and sodium alginate propylene glycol ester in the chitosan-sodium alginate-sodium alginate propylene glycol ester coating liquid is (3-5):1:(1-2).

3. The double-sided drawing paper for marker pen according to claim 2, characterized in that: The weight ratio of chitosan, sodium alginate and sodium alginate propylene glycol ester in the chitosan-sodium alginate-sodium alginate propylene glycol ester coating liquid is 4:1:1.

5.

4. The double-sided drawing paper for a marker pen according to claim 1, characterized in that: A nanocellulose layer is also arranged between the coating layer and the second base paper layer.

5. The double-sided drawing paper for marker pen according to claim 4, characterized in that: The nanocellulose layer is formed by coating a nanocellulose suspension having a concentration of 0.5-2wt% with a coating thickness of 0.4-0.6mm.

6. A production process for double-sided drawing paper for marker pens according to claim 1, characterized in that: The following steps are involved: S1, base paper production, mixing and beating wood pulp fiber raw materials to obtain pulp, passing the pulp through the screen to form, dehydrating the screen, dehydrating by pressing, drying before surface sizing, surface sizing, drying after surface sizing, calendering, and winding to obtain the base paper of the mark paper; S2, coating processing, the base paper is divided into two parts in equal amounts to obtain a first base paper and a second base paper, and a chitosan-sodium alginate-sodium alginate propylene glycol ester coating liquid is coated on the surface of the second base paper, and the coating amount is 1-5g / m 2 , and then drying to obtain a second base paper with a coating layer; S3, hot pressing and laminating, laminating and forming the first base paper and the second base paper with the coating layer, cooling, rewinding, and slitting to obtain double-sided drawing paper for marker pens.

7. The production process of double-sided drawing paper for marker pens according to claim 6, characterized in that: In the coating process, a nanocellulose suspension with a concentration of 0.5-2wt% is firstly coated on the surface of the second base paper with a coating thickness of 0.4-0.6mm, and then a chitosan-sodium alginate-sodium alginate propylene glycol ester coating liquid is coated after drying.

8. The production process of double-sided drawing paper for marker pens according to claim 6, characterized in that: The concentration of the glue solution for surface sizing is 4-6wt%, and the glue solution includes polyvinyl alcohol and cationic starch, and the weight ratio of the polyvinyl alcohol to the cationic starch is (1-2):

1.

9. The production process of double-sided drawing paper for marker pens according to claim 8, characterized in that: The cationic starch comprises cationic amylose and cationic amylopectin in a weight ratio of 1:(3.5-4.5).

10. The double-sided drawing paper for a marker pen according to claim 9, characterized in that: The degree of substitution of the cationic starch is 0.08.

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