Glossy paper and process for its production

Abstract

The present application relates to the technical field of papermaking, in particular to a Glaucin paper and a production process thereof. The present application aims to solve the problem of how to improve the degradation performance of the Glaucin paper. To this end, the production process of the Glaucin paper of the present application can soften the wood and bamboo by steam explosion treatment, and can also destroy the lignin and hemicellulose structure in the wood and bamboo, thereby helping to improve the biodegradability of the Glaucin paper. In addition, the explosion material obtained after steam explosion treatment, together with lithium aluminum silicate, modified cellulose and adhesive, is used as the material for making the Glaucin paper, which not only helps to improve the degradation performance of the Glaucin paper, but also improves the tightness, strength and oil resistance of the Glaucin paper.

Description

Technical Field

[0001] This invention relates to the field of papermaking technology, specifically to a glassine paper and its production process. Background Technology

[0002] Glassine paper is favored by the market for its high gloss, smooth surface, and excellent moisture and water resistance. However, glassine paper produced using traditional processes still has shortcomings in terms of degradation performance, making it difficult to meet increasingly stringent environmental protection requirements.

[0003] Accordingly, a new technical solution is needed in this field to solve the above problems. Summary of the Invention

[0004] To address at least one of the aforementioned problems in the prior art, namely, to solve the problem of how to improve the degradation performance of glassine paper, this application provides a glassine paper manufacturing process, comprising:

[0005] a) The crushed wood and bamboo were subjected to steam explosion treatment at 0.5-0.8MPa for 5-10 minutes, at 1-1.5MPa for 1-2 hours, and at 2-2.4MPa for 10-20 minutes in sequence. After depressurization, the explosive material was obtained.

[0006] b) Add lithium aluminum silicate, modified cellulose, and adhesive to the blasting material obtained in step a), grind, and obtain a mixed slurry;

[0007] c) The mixed pulp is sequentially processed through wire forming, pressing, and drying to obtain the base paper;

[0008] d) The base paper is sizing the surface, dried, and then calendered to obtain glassine paper.

[0009] In the preferred technical solution of the above production process, step a) specifically includes:

[0010] After the pulverized wood and bamboo are placed in a steam explosion device, the pressure is increased to 0.5-0.8 MPa at a rate of 0.3-0.5 MPa / min at a temperature of 120-200℃ and maintained for 5-10 minutes.

[0011] Increase the pressure to 1-1.5 MPa at a rate of 0.2-0.4 MPa / min and maintain it for 1-2 hours;

[0012] Increase the pressure to 2-2.4 MPa at a rate of 0.1-0.3 MPa / min and maintain it for 10-20 minutes;

[0013] The explosive material is obtained by depressurizing at a rate of 50-100 MPa / min.

[0014] In the preferred technical solution of the above production process, in step a), the particle size range of the crushed wood includes 1μm-10μm, 10μm-50μm, 50μm-500μm and 500μm-1mm, wherein the mass ratio of the wood in these four ranges is (2-4):(1-2):(5-10):(1-3).

[0015] In the preferred technical solution of the above production process, in step a), the particle size range of the crushed bamboo includes 10μm-50μm, 50μm-500μm, 500μm-1mm and 1-10mm, wherein the mass ratio of the wood in these four ranges is (1-2):(2-4):(3-5):(0.5-1).

[0016] In the preferred embodiment of the above production process, the method for producing the modified cellulose includes:

[0017] Cellulose, carbamide, and alkaline solution are mixed, and then dodecyltrimethylammonium chloride and starch are added under water bath conditions of 50-70℃. After stirring for 10-20 hours, the mixture is neutralized with acidic solution, washed, filtered, and dried to obtain modified cellulose.

[0018] In the preferred embodiment of the above production process, the mass ratio of cellulose, carbamide, alkaline solution, dodecyltrimethylammonium chloride and starch is (1-3):(0.5-1):(50-100):(0.05-0.1):(0.5-1), and the alkali concentration in the alkaline solution is 5-10%.

[0019] In the preferred technical solution of the above production process, the mass ratio of the blasting material, lithium aluminum silicate, modified cellulose and adhesive is (6-12):(0.1-0.3):(1-2):(1-2).

[0020] In the preferred embodiment of the above production process, the mass concentration of the mixed slurry is 3-5%.

[0021] In the preferred embodiment of the above production process, the adhesive includes one or more of polyvinyl alcohol, guar gum, xanthan gum, and gum arabic.

[0022] This application also discloses a glassine paper, which is produced by the production process described in any of the above preferred technical solutions.

[0023] Those skilled in the art will understand that the glassine paper production process of this application, by subjecting wood and bamboo to steam explosion treatment, not only softens the wood and bamboo but also disrupts the lignin and hemicellulose structure within them, thereby contributing to improved biodegradability of the glassine paper. Furthermore, using the explosion material obtained after steam explosion treatment, along with lithium aluminum silicate, modified cellulose, and adhesives, as materials for producing glassine paper not only enhances its degradation performance but also improves its density, strength, and oil resistance. Detailed Implementation

[0024] This invention provides a process for producing glassine paper, comprising the following:

[0025] a) The crushed wood and bamboo were subjected to steam explosion treatment at 0.5-0.8MPa for 5-10 minutes, at 1-1.5MPa for 1-2 hours, and at 2-2.4MPa for 10-20 minutes in sequence. After depressurization, the explosive material was obtained.

[0026] b) Add lithium aluminum silicate, modified cellulose, and adhesive to the blasting material obtained in step a), grind, and obtain a mixed slurry;

[0027] c) The mixed pulp is sequentially processed through wire forming, pressing, and drying to obtain the base paper;

[0028] d) The base paper is sizing the surface, dried, and then calendered to obtain glassine paper.

[0029] This application utilizes steam explosion treatment to soften wood and bamboo, and also disrupts the lignin and cellulose structures within them, thereby improving the biodegradability of glassine paper. Furthermore, by combining the steam-exploded material with lithium aluminum silicate, modified cellulose, and adhesives to produce glassine paper, not only is the degradation performance of the paper improved, but its density, strength, and oil resistance are also enhanced.

[0030] For step a), the pulverized wood and bamboo were sequentially subjected to steam explosion treatment at 0.5-0.8 MPa for 5-10 min, at 1-1.5 MPa for 1-2 h, and at 2-2.4 MPa for 10-20 min. After depressurization, the exploded material was obtained. Steam explosion treatment of wood and bamboo can destroy the lignin and hemicellulose structure in wood and bamboo, thereby helping to improve the biodegradability of glassine paper.

[0031] In an exemplary embodiment, the particle size range of the pulverized wood in this invention includes 1μm-10μm, 10μm-50μm, 50μm-500μm, and 500μm-1mm, wherein the mass ratio of wood in these four ranges is (2-4):(1-2):(5-10):(1-3). By subjecting the above-mentioned wood to steam explosion treatment, the interfiber bonding force of the glassine paper can be increased, thereby improving the strength of the glassine paper. The particle size range of the pulverized bamboo includes 10μm-50μm, 50μm-500μm, 500μm-1mm, and 1-10mm, wherein the mass ratio of wood in these four ranges is (1-2):(2-4):(3-5):(0.5-1). By subjecting the above-mentioned bamboo to steam explosion treatment, the interfiber bonding force of the glassine paper can also be improved. Furthermore, steam explosion treatment using bamboo and wood within the aforementioned particle size range not only increases the density of glassine paper but also enhances its strength. It should be noted that the mass ratio of wood to bamboo is (1-3):(1-3).

[0032] In an exemplary embodiment, step a) specifically includes: placing the pulverized wood or bamboo into a steam explosion device, increasing the pressure to 0.5-0.8 MPa at a rate of 0.3-0.5 MPa / min and holding for 5-10 minutes at a temperature of 120-200°C; increasing the pressure to 1-1.5 MPa at a rate of 0.2-0.4 MPa / min and holding for 1-2 hours; increasing the pressure to 2-2.4 MPa at a rate of 0.1-0.3 MPa / min and holding for 10-20 minutes; and depressurizing at a rate of 50-100 MPa / min to obtain the explosive material. By gradually increasing and maintaining different pressure stages on the bamboo and wood, the cell walls of the wood and bamboo are effectively destroyed, making the fibers soft and easy to disperse. This not only improves the uniformity of the fibers in the pulp, thus enhancing the smoothness and strength of the glassine paper, but also significantly improves its degradation performance. It should be noted that the pressure is increased by introducing steam into the steam explosion equipment.

[0033] For step b), lithium aluminum silicate, modified cellulose, and adhesive are added to the blasting material obtained in step a), and then ground to obtain a mixed slurry. Adding lithium aluminum silicate, modified cellulose, and adhesive to the blasting material not only improves the degradation performance of glassine paper but also enhances its density, strength, and oil resistance.

[0034] It should be noted that the use of lithium aluminum silicate can effectively improve the dimensional stability of paper at different temperatures and reduce paper deformation caused by temperature changes. The lithium aluminum silicate comprises small particles of 0.1-1 μm, 1-5 μm particles, and large particles of 5-20 μm in a mass ratio of (3-5):(1-2):(0.5-1). By using different particle sizes for gradation, the roughness of glassine paper can also be improved, thereby enhancing the bond strength between the base paper and the sizing agent during subsequent sizing processes.

[0035] In an exemplary embodiment, the method for preparing modified cellulose includes: mixing cellulose, carbamide, and an alkaline solution; then adding dodecyltrimethylammonium chloride and starch under a water bath at 50-70°C; stirring for 10-20 hours; neutralizing with an acidic solution; washing, filtering, and drying to obtain modified cellulose. Modifying cellulose can improve the oleophobic properties of the base paper, facilitate paper forming, and improve paper quality. This application does not limit the type of cellulose; it can be one or both of hydroxyethyl cellulose and hydroxypropyl cellulose. The mass ratio of cellulose, carbamide, alkaline solution, dodecyltrimethylammonium chloride, and starch is (1-3):(0.5-1):(50-100):(0.05-0.1):(0.5-1), and the alkaline concentration in the alkaline solution is 5-10%. The alkaline solution can be a KOH solution or a NaOH solution.

[0036] In an exemplary embodiment, the mass ratio of the blasting material, lithium aluminum silicate, modified cellulose, and adhesive is (6-12):(0.1-0.3):(1-2):(1-2).

[0037] In an exemplary embodiment, the mass concentration of the mixed slurry is 3-5%. Additionally, the adhesive includes one or more of polyvinyl alcohol, guar gum, xanthan gum, and gum arabic.

[0038] For step c), the mixed pulp is sequentially passed through wire forming, pressing, and drying to obtain the base paper;

[0039] Among them, the papermaking, pressing, and drying processes are all conventional technologies in this field and will not be described in detail here.

[0040] For step d), the sizing agent used in the sizing process is paraffin emulsion, carboxymethyl cellulose, or styrene-maleic anhydride copolymer. Applying these sizing agents to the base paper improves the oil resistance of glassine paper. Additionally, the surface sizing coating amount is 10-30 g / m². 2 By using the above coating amount, the smoothness of glassine paper can be improved.

[0041] The present invention will be described in conjunction with the following embodiments.

[0042] Example 1

[0043] The production process of glassine paper includes the following steps:

[0044] a) Wood and bamboo in a 1:1 mass ratio were pulverized separately. The pulverized wood had sizes of 1μm-10μm, 10μm-50μm, 50μm-500μm, and 500μm-1mm, with a mass ratio of 3:1.2:8:1.5. The pulverized bamboo had sizes of 10μm-50μm, 50μm-500μm, 500μm-1mm, and 1-10mm, with a mass ratio of 1.5:3:4:0.8.

[0045] The pulverized wood and bamboo were mixed and placed in a steam blasting device. The mixture was heated to 150°C, and then the pressure was increased to 0.7 MPa at a rate of 0.4 MPa / min and held for 8 minutes. The pressure was then increased to 1.2 MPa at a rate of 0.3 MPa / min and held for 1.5 hours. The pressure was then increased to 2.2 MPa at a rate of 0.2 MPa / min and held for 15 minutes. Finally, the pressure was released at a rate of 80 MPa / min to obtain the blasting material.

[0046] b) Add lithium aluminum silicate, modified cellulose, and adhesive to the blasting material obtained in step a), wherein the mass ratio of the blasting material to lithium aluminum silicate, modified cellulose, and adhesive is 10:0.2:1.5:1.5. After adding water, grind to obtain a mixed slurry with a mass concentration of 4%.

[0047] The lithium aluminum silicate comprises small particles of 0.1-1 μm, microparticles of 1-5 μm, and large particles of 5-20 μm in a mass ratio of 4:1.5:0.8. The modified cellulose is prepared by mixing hydroxyethyl cellulose, carbamide, and a 7% NaOH solution, then adding dodecyltrimethylammonium chloride and starch in a 60°C water bath, stirring for 15 hours, neutralizing the pH to 6 with HCl solution, washing, filtering, and drying to obtain the modified cellulose. The mass ratio of hydroxyethyl cellulose, carbamide, NaOH solution, dodecyltrimethylammonium chloride, and starch is 2:0.75:80:0.07:0.8. The adhesive comprises polyvinyl alcohol and xanthan gum in a mass ratio of 2:1.

[0048] c) The mixed pulp is sequentially processed through wire forming, pressing, and drying to obtain the base paper;

[0049] d) The base paper is sizing, dried, and then calendered to obtain glassine paper; wherein the sizing agent is carboxymethyl cellulose with a solid content of 30%, and the surface sizing coating amount is 20 g / m². 2 .

[0050] Example 2

[0051] The production process of glassine paper includes the following steps:

[0052] a) Wood and bamboo in a mass ratio of 2:1 were pulverized separately. The pulverized wood had sizes including 1μm-10μm, 10μm-50μm, 50μm-500μm, and 500μm-1mm, with a mass ratio of 2.5:1.5:7:2. The pulverized bamboo had sizes including 10μm-50μm, 50μm-500μm, 500μm-1mm, and 1-10mm, with a mass ratio of 1.8:3.5:3.5:0.7.

[0053] The pulverized wood and bamboo were mixed and placed in a steam blasting device. The mixture was heated to 180°C, and then the pressure was increased to 0.6 MPa at a rate of 0.35 MPa / min and held for 8 minutes. The pressure was then increased to 1.3 MPa at a rate of 0.25 MPa / min and held for 1.2 hours. The pressure was then increased to 2.3 MPa at a rate of 0.15 MPa / min and held for 18 minutes. Finally, the pressure was released at a rate of 90 MPa / min to obtain the blasting material.

[0054] b) Add lithium aluminum silicate, modified cellulose, and adhesive to the blasting material obtained in step a), wherein the mass ratio of the blasting material to lithium aluminum silicate, modified cellulose, and adhesive is 8:0.15:1.3:1.4. After adding water, grind to obtain a mixed slurry with a mass concentration of 3.5%.

[0055] The lithium aluminum silicate comprises small particles of 0.1-1 μm, microparticles of 1-5 μm, and large particles of 5-20 μm in a mass ratio of 4.5:1.8:0.7. The modified cellulose is prepared by mixing hydroxypropyl cellulose, carbamide, and a 6% KOH solution, then adding dodecyltrimethylammonium chloride and starch in a water bath at 55°C, stirring for 18 hours, neutralizing the pH to 6 with HCl solution, washing, filtering, and drying to obtain the modified cellulose. The mass ratio of hydroxypropyl cellulose, carbamide, KOH solution, dodecyltrimethylammonium chloride, and starch is 1.5:0.9:80:0.06:0.65. The adhesive is polyvinyl alcohol.

[0056] c) The mixed pulp is sequentially processed through wire forming, pressing, and drying to obtain the base paper;

[0057] d) The base paper is sizing the surface, dried, and then calendered to obtain glassine paper;

[0058] The sizing agent is a paraffin emulsion with a solid content of 40 wt%, and the surface sizing coating amount is 15 g / m². 2 .

[0059] Example 3

[0060] The production process of glassine paper includes the following steps:

[0061] a) Wood and bamboo in a mass ratio of 1:2 were pulverized separately. The pulverized wood had sizes including 1μm-10μm, 10μm-50μm, 50μm-500μm, and 500μm-1mm, with a mass ratio of 3.5:1.8:6:2.5; the pulverized bamboo had sizes including 10μm-50μm, 50μm-500μm, 500μm-1mm, and 1-10mm, with a mass ratio of 1.2:2.5:4.5:0.6.

[0062] The pulverized wood and bamboo were mixed and placed in a steam blasting device. The mixture was heated to 160°C, and then the pressure was increased to 0.75 MPa at a rate of 0.45 MPa / min and held for 7 minutes. The pressure was then increased to 1.4 MPa at a rate of 0.35 MPa / min and held for 1.5 hours. The pressure was then increased to 2.1 MPa at a rate of 0.25 MPa / min and held for 18 minutes. Finally, the pressure was released at a rate of 80 MPa / min to obtain the blasting material.

[0063] b) Add lithium aluminum silicate, modified cellulose, and adhesive to the blasting material obtained in step a), wherein the mass ratio of the blasting material to lithium aluminum silicate, modified cellulose, and adhesive is 10:0.25:1.8:1.5. After adding water, grind to obtain a mixed slurry with a mass concentration of 4.5%.

[0064] The lithium aluminum silicate comprises small particles of 0.1-1 μm, microparticles of 1-5 μm, and large particles of 5-20 μm in a mass ratio of 4.5:1.8:0.75. The modified cellulose is prepared by mixing hydroxyethyl cellulose, carbamide, and a 9% NaOH solution, then adding dodecyltrimethylammonium chloride and starch in a 65°C water bath. After stirring for 15 hours, the pH is neutralized to 6 with HCl solution, followed by washing, filtration, and drying to obtain the modified cellulose. The mass ratio of hydroxyethyl cellulose, carbamide, NaOH solution, dodecyltrimethylammonium chloride, and starch is 2.5:0.6:60:0.06:0.9. The adhesive comprises polyvinyl alcohol, guar gum, and guar gum in a mass ratio of 2:0.5:0.5.

[0065] c) The mixed pulp is sequentially processed through wire forming, pressing, and drying to obtain the base paper;

[0066] d) The base paper is sizing the surface, dried, and then calendered to obtain glassine paper;

[0067] The sizing agent is a styrene-maleic anhydride copolymer with a solid content of 60 wt%, and the surface sizing coating amount is 25 g / m². 2 .

[0068] Example 4

[0069] The production process of glassine paper includes the following steps:

[0070] a) Wood and bamboo in a mass ratio of 1:3 were pulverized separately. The pulverized wood had sizes of 1μm-10μm, 10μm-50μm, 50μm-500μm, and 500μm-1mm, with a mass ratio of 2:1:5:1. The pulverized bamboo had sizes of 10μm-50μm, 50μm-500μm, 500μm-1mm, and 1-10mm, with a mass ratio of 1:2:3:0.5.

[0071] The pulverized wood and bamboo were mixed and placed in a steam blasting device. The mixture was heated to 120°C, and then the pressure was increased to 0.5 MPa at a rate of 0.3 MPa / min and held for 10 min. The pressure was then increased to 1 MPa at a rate of 0.2 MPa / min and held for 2 h. The pressure was then increased to 2 MPa at a rate of 0.1 MPa / min and held for 20 min. Finally, the pressure was released at a rate of 100 MPa / min to obtain the blasting material.

[0072] b) Add lithium aluminum silicate, modified cellulose, and adhesive to the blasting material obtained in step a), wherein the mass ratio of the blasting material to lithium aluminum silicate, modified cellulose, and adhesive is 6:0.1:1:1. After adding water, grind to obtain a mixed slurry with a mass concentration of 3%.

[0073] The lithium aluminum silicate comprises small particles of 0.1-1 μm, microparticles of 1-5 μm, and large particles of 5-20 μm in a mass ratio of 3:1:0.5. The modified cellulose is prepared by mixing hydroxypropyl cellulose, carbamide, and a 5% NaOH solution, then adding dodecyltrimethylammonium chloride and starch in a 50°C water bath. After stirring for 10 hours, the pH is neutralized to 6 with HCl solution, followed by washing, filtration, and drying to obtain the modified cellulose. The mass ratio of hydroxypropyl cellulose, carbamide, NaOH solution, dodecyltrimethylammonium chloride, and starch is 1:0.5:50:0.05:0.5. The adhesive comprises gulverine and xanthan gum in a mass ratio of 1:1.

[0074] c) The mixed pulp is sequentially processed through wire forming, pressing, and drying to obtain the base paper;

[0075] d) The base paper is sizing the surface, dried, and then calendered to obtain glassine paper;

[0076] The sizing agent is carboxymethyl cellulose with a solid content of 55 wt%, and the surface sizing coating amount is 10 g / m². 2 .

[0077] Example 5

[0078] The production process of glassine paper includes the following steps:

[0079] a) Wood and bamboo in a mass ratio of 3:1 were pulverized separately. The pulverized wood had sizes of 1μm-10μm, 10μm-50μm, 50μm-500μm, and 500μm-1mm, with a mass ratio of 4:2:10:3. The pulverized bamboo had sizes of 10μm-50μm, 50μm-500μm, 500μm-1mm, and 1-10mm, with a mass ratio of 2:4:5:1.

[0080] The pulverized wood and bamboo were mixed and placed in a steam blasting device. The mixture was heated to 200°C, and then the pressure was increased to 0.8 MPa at a rate of 0.5 MPa / min and held for 5 minutes. The pressure was then increased to 1.5 MPa at a rate of 0.4 MPa / min and held for 1 hour. The pressure was then increased to 2.4 MPa at a rate of 0.3 MPa / min and held for 10 minutes. Finally, the pressure was released at a rate of 50 MPa / min to obtain the blasting material.

[0081] b) Add lithium aluminum silicate, modified cellulose, and adhesive to the blasting material obtained in step a), wherein the mass ratio of the blasting material to lithium aluminum silicate, modified cellulose, and adhesive is 12:0.3:2:2. After adding water, grind to obtain a mixed slurry with a mass concentration of 5%.

[0082] The lithium aluminum silicate comprises small particles of 0.1-1 μm, microparticles of 1-5 μm, and large particles of 5-20 μm in a mass ratio of 5:2:1. The modified cellulose is prepared by mixing hydroxyethyl cellulose, carbamide, and a 10% KOH solution, then adding dodecyltrimethylammonium chloride and starch in a 70°C water bath. After stirring for 20 hours, the pH is neutralized to 6 with HCl solution, followed by washing, filtration, and drying to obtain the modified cellulose. The mass ratio of hydroxyethyl cellulose, carbamide, KOH solution, dodecyltrimethylammonium chloride, and starch is 3:1:100:0.1:1. The adhesive is gum arabic.

[0083] c) The mixed pulp is sequentially processed through wire forming, pressing, and drying to obtain the base paper;

[0084] d) The base paper is sizing the surface, dried, and then calendered to obtain glassine paper;

[0085] The sizing agent is a paraffin emulsion with a solid content of 40 wt%, and the surface sizing coating amount is 30 g / m². 2 .

[0086] Comparative Example 1

[0087] The only difference from Example 1 is step a), specifically as follows:

[0088] Wood and bamboo in a 1:1 mass ratio were pulverized separately. The wood pulverized to a size of 500μm-1mm, and the bamboo pulverized to a size including 10μm-50μm, 50μm-500μm, 500μm-1mm, and 1-10mm, with a mass ratio of 1.5:3:4:0.8.

[0089] Comparative Example 2

[0090] The only difference from Example 1 is step a), specifically as follows:

[0091] Step a) specifically involves:

[0092] Wood and bamboo in a 1:1 mass ratio were crushed separately. The crushed wood had sizes ranging from 1μm to 10μm, 10μm to 50μm, 50μm to 500μm, and 500μm to 1mm, with a mass ratio of 3:1.2:8:1.5. The crushed bamboo had a size ranging from 1mm to 10mm.

[0093] Comparative Example 3

[0094] The only difference from Example 1 is step a), specifically as follows:

[0095] Wood and bamboo, in a 1:1 mass ratio, were pulverized separately. The pulverized wood had sizes ranging from 10μm to 50μm, 50μm to 500μm, and 500μm to 1mm, with a mass ratio of 4.2:8:1.5. The pulverized bamboo had sizes ranging from 10μm to 50μm, 50μm to 500μm, 500μm to 1mm, and 1 to 10mm, with a mass ratio of 1.5:3:4:0.8.

[0096] Comparative Example 4

[0097] The only difference from Example 1 is step a), specifically as follows:

[0098] Wood and bamboo, in a 1:1 mass ratio, were pulverized separately. The pulverized wood had sizes ranging from 1μm to 10μm, 10μm to 50μm, 50μm to 500μm, and 500μm to 1mm, with a mass ratio of 3:1.2:8:1.5. The pulverized bamboo had sizes ranging from 50μm to 500μm, 500μm to 1mm, and 1 to 10mm, with a mass ratio of 4.5:4:0.8.

[0099] Comparative Example 5

[0100] The only difference from Example 1 is step a), specifically as follows:

[0101] Wood and bamboo in a 1:1 mass ratio were pulverized separately. The pulverized wood had a size of 50-500μm and 500μm-1mm, with a mass ratio of 4.2:2.3. The pulverized bamboo had a size of 10μm-50μm and 500μm-1mm, with a mass ratio of 4.5:4.8.

[0102] Comparative Example 6

[0103] The only difference from Example 2 is step a), specifically as follows:

[0104] The pulverized wood and bamboo were mixed and placed into a steam explosion equipment. The mixture was heated to 180°C and then the pressure was increased to 2.3 MPa at a rate of 0.35 MPa / min and maintained for 98 minutes. The pressure was then released at a rate of 90 MPa / min to obtain the explosive material.

[0105] Comparative Example 7

[0106] The only difference from Example 2 is step a), specifically as follows:

[0107] The pulverized wood and bamboo were mixed and placed into a steam blasting device. The mixture was heated to 180°C and then the pressure was increased to 0.6 MPa at a rate of 0.35 MPa / min and held for 8 minutes. The pressure was then increased to 2.3 MPa at a rate of 0.25 MPa / min and held for 90 minutes. Finally, the pressure was released at a rate of 90 MPa / min to obtain the blasting material.

[0108] Comparative Example 8

[0109] The only difference from Example 2 is step a), specifically as follows:

[0110] The pulverized wood and bamboo were mixed and placed in a steam explosion device. The mixture was heated to 180°C, and then the pressure was increased to 0.6 MPa at a rate of 0.15 MPa / min and held for 8 minutes. The pressure was then increased to 1.3 MPa at a rate of 0.35 MPa / min and held for 1.2 hours. The pressure was then increased to 2.3 MPa at a rate of 0.25 MPa / min and held for 18 minutes. Finally, the pressure was released at a rate of 90 MPa / min to obtain the explosive material.

[0111] Comparative Example 9

[0112] The only difference from Example 2 is step a), specifically as follows:

[0113] The pulverized wood and bamboo were mixed and placed in a steam blasting device. The mixture was heated to 180°C and then pressurized to 0.6 MPa at a rate of 0.35 MPa / min and held for 8 minutes. The pressure was then increased to 1.3 MPa at a rate of 0.25 MPa / min and held for 1.2 hours. The pressure was then increased to 2.3 MPa at a rate of 0.15 MPa / min and held for 18 minutes. Finally, the pressure was released at a rate of 30 MPa / min to obtain the blasting material.

[0114] Comparative Example 10

[0115] The only difference from Example 2 is step a), specifically as follows:

[0116] The pulverized wood and bamboo were mixed and placed in a steam blasting device. The mixture was heated to 180°C and then pressurized to 0.6 MPa at a rate of 0.35 MPa / min and held for 8 minutes. The pressure was then increased to 1.3 MPa at a rate of 0.25 MPa / min and held for 1.2 hours. The pressure was then increased to 2.3 MPa at a rate of 0.15 MPa / min and held for 18 minutes. Finally, the pressure was released at a rate of 150 MPa / min to obtain the blasting material.

[0117] Comparative Example 11

[0118] The only difference from Example 3 is in step b), and the specific differences are as follows:

[0119] Lithium aluminum silicate, hydroxypropyl cellulose, and adhesive are added to the blasting material obtained in step a), wherein the mass ratio of the blasting material to lithium aluminum silicate, hydroxypropyl cellulose, and adhesive is 8:0.15:1.3:1.4. After adding water, the mixture is ground to obtain a mixed slurry with a mass concentration of 3.5%.

[0120] Comparative Example 12

[0121] The only difference from Example 3 is in step b), and the specific differences are as follows:

[0122] Modified cellulose and adhesive are added to the blasting material obtained in step a), wherein the mass ratio of the blasting material to lithium aluminum silicate, modified cellulose and adhesive is 8:1.3:1.4. After adding water, the mixture is ground to obtain a mixed slurry with a mass concentration of 3.5%.

[0123] Comparative Example 13

[0124] The only difference from Example 4 is step b), and the specific differences are as follows:

[0125] Lithium aluminum silicate includes small particles of 0.1-1 μm and large particles of 5-20 μm with a mass ratio of 3:0.5.

[0126] Comparative Example 14

[0127] The only difference from Example 4 is step a), and the specific differences are as follows:

[0128] Lithium aluminum silicate has a small particle size of 0.1-1 μm.

[0129] Comparative Example 15

[0130] The only difference from Example 4 is step b), and the specific differences are as follows:

[0131] Lithium aluminum silicate has a particle size of 1-5 μm.

[0132] Comparative Example 16

[0133] The only difference from Example 4 is step b), and the specific differences are as follows:

[0134] Lithium aluminum silicate has a large particle size of 5-20μm.

[0135] The glassine paper prepared in Examples 1-5 and Comparative Examples 1-16 was tested for density, roughness, oleophobicity, tensile strength and tear strength according to GB / T29282-2024. At the same time, the degree of glassine disintegration was tested according to GB / T39951-2021. The results are shown in Table 1.

[0136] Table 1 Performance parameters of Examples 1-5 and Comparative Examples 1-16

[0137]

[0138] As can be seen from the experimental data in Table 1, the glassine paper prepared in Examples 1-5 is superior to the glassine paper prepared in Comparative Documents 1-16 in terms of density, roughness, oleophobicity, tensile strength, and tear strength, and also has good degradation performance.

[0139] Those skilled in the art will understand that although some embodiments described herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, any of the claimed embodiments in the claims of this application can be used in any combination.

[0140] It should be noted that although the detailed steps of the method of this application have been described in detail above, those skilled in the art can combine, split and rearrange the above steps without departing from the basic principles of this application. Such modified technical solutions do not change the basic concept of this application and therefore fall within the protection scope of this application.

[0141] The technical solutions of this application have been described in conjunction with preferred embodiments. However, it will be readily understood by those skilled in the art that the scope of protection of this application is obviously not limited to these specific embodiments. Without departing from the principles of this application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of this application.

Claims

1. A glassine paper production process, characterized in that, include: a) The crushed wood and bamboo were subjected to steam explosion treatment at 0.5-0.8MPa for 5-10 minutes, at 1-1.5MPa for 1-2 hours, and at 2-2.4MPa for 10-20 minutes in sequence. After depressurization, the explosive material was obtained. b) Add lithium aluminum silicate, modified cellulose, and adhesive to the blasting material obtained in step a), grind, and obtain a mixed slurry; c) The mixed pulp is sequentially processed through wire forming, pressing, and drying to obtain the base paper; d) The base paper is sizing the surface, dried, and then calendered to obtain glassine paper; The method for preparing the modified cellulose includes: Cellulose, carbamide and alkaline solution are mixed, and then dodecyltrimethylammonium chloride and starch are added under water bath conditions of 50-70℃. After stirring for 10-20 hours, the mixture is neutralized with acidic solution, washed, filtered and dried to obtain modified cellulose. The mass ratio of the cellulose, the carbamide, the alkaline solution, the dodecyltrimethylammonium chloride, and the starch is (1-3):(0.5-1):(50-100):(0.05-0.1):(0.5-1), and the alkaline solution has an alkali concentration of 5-10%. The mass ratio of the blasting material, lithium aluminum silicate, modified cellulose, and adhesive is (6-12):(0.1-0.3):(1-2):(1-2).

2. The production process according to claim 1, characterized in that, Step a) specifically includes: After the pulverized wood and bamboo are placed in a steam explosion device, the pressure is increased to 0.5-0.8 MPa at a rate of 0.3-0.5 MPa / min at a temperature of 120-200℃ and maintained for 5-10 minutes. Increase the pressure to 1-1.5 MPa at a rate of 0.2-0.4 MPa / min and maintain it for 1-2 hours; Increase the pressure to 2-2.4 MPa at a rate of 0.1-0.3 MPa / min and maintain it for 10-20 minutes; The explosive material is obtained by depressurizing at a rate of 50-100 MPa / min.

3. The production process according to claim 1, characterized in that, In step a), the particle size range of the pulverized wood includes 1μm-10μm, 10μm-50μm, 50μm-500μm and 500μm-1mm, wherein the mass ratio of the wood in these four ranges is (2-4):(1-2):(5-10):(1-3).

4. The production process according to claim 1, characterized in that, In step a), the particle size range of the crushed bamboo includes 10μm-50μm, 50μm-500μm, 500μm-1mm and 1-10mm, wherein the mass ratio of the wood in these four ranges is (1-2):(2-4):(3-5):(0.5-1).

5. The production process according to claim 1, characterized in that, The mass concentration of the mixed slurry is 3-5%.

6. The production process according to claim 1, characterized in that, The adhesive includes one or more of polyvinyl alcohol, guar gum, xanthan gum, and gum arabic.

7. A type of glassine paper, characterized in that, The glassine paper is produced by the production process described in any one of claims 1-6.

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