Mildew-proof glass isolation paper and preparation method thereof

Abstract

The invention relates to the technical field of papermaking, and provides mildewproof glass isolation paper and a preparation method thereof.The mildewproof glass isolation paper comprises an outer layer, a silicone oil layer and an inner layer, the preparation method comprises the steps that S100, a papermaking additive is added into paper pulp and stirred to be uniform, paper is made, a mildewproof solution is sprayed to the finished paper, and the inner layer is obtained; s200, coating silicone oil on the upper surface of the inner layer to obtain the inner layer with a silicone oil layer; and S300, melting polyethylene particles, and coating the surface of the silicone oil layer with the molten polyethylene particles to obtain the mildew-proof glass isolation paper. The mildew-proof glass isolation paper comprises the outer layer, the silicone oil layer and the inner layer, and by means of the multi-layer structural design, more excellent mildew-proof performance is provided for the glass isolation paper.

Description

Technical Field

[0001] The present invention relates to the technical field of papermaking processes, and more particularly, to a mold-proof glass separator paper and a preparation method thereof. Background Art

[0002] As a separator paper between various glasses, the glass separator paper is mainly used for the post-packaging interval of glass products, and can also be used between glass substrates after cutting or thinning of the glass substrate. It is required to have high surface strength, be dust-free and impurity-free, not shed hair or powder, and play an important role in protecting and isolating during the transportation of various glasses, preventing glass mildew, protecting the glass, and preventing friction or scratching between glass substrates. During long-term transportation and storage of glass, the glass separator paper may mildew due to factors such as environmental humidity changes, thereby corroding the glass substrate and damaging the protected glass substrate. Currently, the separator papers produced in China have disadvantages such as easy mildew during long-term storage, high production costs, and unstable product quality.

[0003] Currently, in the related art, in order to endow the glass separator paper with mold-proof performance, a mold-proof agent is usually coated on the surface of the ordinary separator paper. Although the prepared mold-proof glass separator paper has certain mold-proof performance, it is easy to cause premature loss of the mold-proof agent and the persistence of the mold-proof effect is not high. Therefore, there is an urgent need to provide a mold-proof glass separator paper with better mold-proof performance and a preparation method thereof. Summary of the Invention

[0004] The present invention aims to solve at least one of the above technical problems.

[0005] The present invention provides a preparation method of a mold-proof glass separator paper. The mold-proof glass separator paper includes an outer layer, a silicone oil layer, and an inner layer. The preparation method includes:

[0006] S100. Adding papermaking aids to the pulp and stirring evenly, then forming paper, and spraying a mold-proof solution on the formed paper to obtain the inner layer;

[0007] S200. Coating silicone oil on the upper surface of the inner layer to obtain an inner layer with a silicone oil layer;

[0008] S300. Melting polyethylene particles and coating them on the surface of the silicone oil layer to obtain the mold-proof glass separator paper;

[0009] Wherein, the papermaking aids include a softener, a filler, and a wet strength agent; S100 includes:

[0010] S110. Chemically soaking bleached hardwood pulp, bleached softwood pulp, and nanofibers, and then performing beating treatment to obtain bleached chemical pulp;

[0011] S120. Adding a softener, a filler, and a wet strength agent to the bleached chemical pulp, filtering with clear water, dehydrating at the wire section, pressing, and drying to obtain the formed paper;

[0012] S130. Spray a mildew-proof solution onto the formed paper to obtain the inner layer;

[0013] The mildew-proof solution is a lactic acid / chitosan quaternary ammonium salt-bronopol nano microsphere solution.

[0014] In any of the above technical solutions, in S110, the mass ratio of bleached hardwood pulp, bleached softwood pulp to nanofibers is (0.8 - 1):(0.2 - 0.3):(0.05 - 0.3); and / or in S110, the beating degree of the beating treatment is 40 - 50°SR; and / or in S120, the mass ratio of bleached chemical pulp, softener, filler to wet strength agent is 1:(0.1 - 0.5):(0.1 - 0.5):(0.1 - 0.5):(0.1 - 0.3).

[0015] In any of the above technical solutions, in S120, the softener includes any one of trifluorochlorosilane-modified fatty amine, diene-based quaternary ammonium salt-modified fatty amine, amino silane-modified fatty amine or polydimethylsiloxane-modified fatty amine; and / or the filler includes at least one of talc powder, calcium carbonate, palygorskite or kaolin; and / or the wet strength agent includes at least one of cationic starch, polyvinyl alcohol, sodium polyacrylate or tetramethyl ammonium chloride.

[0016] In any of the above technical solutions, the preparation method of the lactic acid / chitosan quaternary ammonium salt-bronopol nano microsphere solution includes:

[0017] S131. Dissolve the chitosan quaternary ammonium salt powder in lactic acid aqueous solution and carry out stirring treatment to completely dissolve the chitosan quaternary ammonium salt to obtain a lactic acid / chitosan quaternary ammonium salt aqueous solution;

[0018] S132. Add the bronopol solution to the lactic acid / chitosan quaternary ammonium salt aqueous solution and mix evenly, then dropwise add an anionic polyacrylamide solution and react to prepare a lactic acid / chitosan-bronopol nano microsphere solution complex;

[0019] Among them, the chitosan quaternary ammonium salt includes N,N,N-trimethyl chitosan or hydroxypropyl trimethyl ammonium chloride chitosan.

[0020] In any of the above technical solutions, in S131, the temperature of the stirring treatment is 45 - 65°C; and / or in S131, the mass-volume ratio of chitosan quaternary ammonium salt to lactic acid is 1g:1 - 5ml; and / or in S132, the mass ratio of lactic acid / chitosan quaternary ammonium salt solution to bronopol is 1:(0.1 - 1).

[0021] In any of the above technical solutions, in S200, the preparation method of the silicone oil includes:

[0022] S210. Add nitrate into deionized water, stir evenly, and then add sodium borohydride for the first ultrasonic dispersion treatment to obtain silver oxide nanoparticles;

[0023] S220. Add alumina particles into methylphenyl silicone oil, stir evenly to obtain modified silicone oil;

[0024] S230. Add silver oxide nanoparticles into the modified silicone oil, stir evenly to obtain silicone oil.

[0025] In any of the above technical solutions, in S210, the temperature of the ultrasonic dispersion treatment is 50 - 60 °C, and the time is 1 - 2 h; and / or in S220, the viscosity of the methylphenyl silicone oil is 100 - 300 cSt; and / or in S220, the particle size of the alumina particles is 50 - 120 nm; and / or in S220, the mass ratio of the alumina particles to the methylphenyl silicone oil is (0.05 - 0.2):1; and / or in S230, the mass ratio of the silver oxide nanoparticles to the silicone oil is (0.05 - 0.1):1.

[0026] In any of the above technical solutions, in S300, the preparation method of the polyethylene particles includes:

[0027] S310. Mix benzisothiazolinone with carboxymethyl cellulose and disperse them into a uniform emulsion, and then perform spray treatment to obtain microcapsules of benzisothiazolinone;

[0028] S320. Add the microcapsules of benzisothiazolinone into an ethanol solution of silane coupling agent, and perform the second ultrasonic dispersion treatment and static treatment in sequence to obtain surface - modified microcapsules of benzisothiazolinone;

[0029] S330. Blend the surface - modified microcapsules of benzisothiazolinone with a polyethylene matrix and then melt - extrude and pelletize to obtain polyethylene particles;

[0030] Among them, the polyethylene matrix is a mixture of low - density linear polyethylene and high - density linear polyethylene;

[0031] The mass ratio of the surface - modified microcapsules of benzisothiazolinone to the polyethylene matrix is (0.01 - 0.2):1.

[0032] In any of the above technical solutions, the thickness of the inner layer is 30 - 50 μm; and / or the thickness of the silicone oil layer is 5 - 10 μm; and / or the thickness of the outer layer is 15 - 30 μm.

[0033] To achieve the second object of the present invention, the present invention also provides a mildew - proof glass isolation paper, and the mildew - proof glass isolation paper is prepared by using the preparation method of any one of the above technical solutions.

[0034] After adopting the technical solution of the present invention, the following technical effects can be achieved:

[0035] 1. The mildew-proof glass release paper of the present invention includes an outer layer, a silicone oil layer and an inner layer. Through the multi-layer structure design, it aims to provide better mildew-proof performance for the glass release paper.

[0036] 2. Select the formula of bleached hardwood pulp, bleached softwood pulp and nanofibers for papermaking, so that the formed paper not only has certain mechanical strength and smoothness, but also has better softness, which is beneficial to the subsequent attachment of the mildew-proof agent to the formed paper.

[0037] 3. The silicone oil can not only enhance the mildew-proof performance, but also further enhance the bonding force with the outer layer subsequently, making the prepared mildew-proof glass release paper have a tight bond between layers and not easy to fall off.

[0038] 4. Polyethylene is uniformly coated on the surface of the silicone oil layer after melting. The polyethylene layer can enhance the tear resistance of the paper, prevent damage during handling, and at the same time can provide good water vapor barrier performance, and cooperate with the silicone oil layer to further improve the mildew-proof effect. Specific embodiments

[0039] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present invention.

[0040] In the related art, in order to endow the glass release paper with mildew-proof performance, usually a layer of mildew-proof agent is coated on the surface of the ordinary release paper. Although the prepared mildew-proof glass release paper has certain mildew-proof performance, it is easy to cause the premature loss of the mildew-proof agent and the persistence of the mildew-proof effect is not high.

[0041] In view of this, the present invention provides a mildew-proof glass release paper and its preparation method. By preparing an inner layer and an outer layer both having mildew-proof performance, the mildew-proof performance of the finished mildew-proof glass release paper is improved, and by adding a silicone oil layer between the inner layer and the outer layer, the bonding force between the inner layer and the outer layer is improved and the mildew-proof performance is further improved.

[0042] Specifically, the embodiment of the present invention provides a preparation method of a mildew-proof glass release paper. The mildew-proof glass release paper includes an outer layer, a silicone oil layer and an inner layer. The preparation method includes:

[0043] S100. Add papermaking aids to the pulp and stir evenly, then form paper by papermaking, and spray a mildew-proof solution on the formed paper to obtain the inner layer.

[0044] S200. Coating silicone oil on the upper surface of the inner layer to obtain an inner layer with a silicone oil layer;

[0045] S300. Melting polyethylene particles and then coating them on the surface of the silicone oil layer to obtain a mildew-proof glass separator paper;

[0046] Among them, the papermaking aids include softeners, fillers, and wet strength agents.

[0047] Preferably, the mildew-proof glass separator paper of the present invention includes an outer layer, a silicone oil layer, and an inner layer. Through the multi-layer structure design, it aims to provide better mildew-proof performance for the glass separator paper; first, papermaking aids are added to the pulp to make the paper formed have better performance; after the paper is formed, a mildew-proof solution is sprayed on the formed paper, so that the obtained inner layer has a certain mildew-proof effect. The mildew-proof solution is preferably sprayed three times repeatedly to enable the mildew-proof solution to penetrate into the interior of the formed paper and make the inner layer have a better mildew-proof effect; after the inner layer is obtained, a layer of silicone oil is coated on the upper surface of the inner layer. The silicone oil can not only enhance the mildew-proof performance but also further enhance the bonding force with the subsequent outer layer, making the layers of the obtained mildew-proof glass separator paper tightly bonded and not easily falling off; the outer layer is a polyethylene layer, which is formed by uniformly coating the melted polyethylene on the surface of the silicone oil layer. The polyethylene layer can enhance the tear strength of the paper, prevent damage during handling, and at the same time can provide good water vapor barrier properties, and cooperate with the silicone oil layer to further improve the mildew-proof effect.

[0048] Preferably, before coating the silicone oil layer, the inner layer should also be corona treated to further enhance the bonding force between the inner layer and other layers. After corona treatment, the dyne value of the inner layer is 48 - 52 dyne.

[0049] Furthermore, S100 includes:

[0050] S110. Chemically soaking bleached hardwood pulp, bleached softwood pulp, and nanofibers, and then performing beating treatment to obtain bleached chemical pulp;

[0051] S120. Adding softeners, fillers, and wet strength agents to the bleached chemical pulp, filtering with clear water, dehydrating at the wire section, pressing, and drying to obtain formed paper;

[0052] S130. Spraying a mildew-proof solution on the formed paper to obtain an inner layer;

[0053] The mildew-proof solution is a lactic acid / chitosan quaternary ammonium salt - bronopol nanosphere solution.

[0054] Preferably, since the mildew-proof glass release paper is for protecting glass materials, the base paper, which is the main material of the inner layer of the mildew-proof glass release paper, should have a soft property. Therefore, a formulation of bleached hardwood pulp, bleached softwood pulp and nanofibers is selected for papermaking, so that the base paper not only has certain mechanical strength and smoothness, but also has better softness, which is beneficial to the subsequent attachment of the mildew-proof agent to the base paper; the chemical immersion is carried out with a NaOH solution to remove lignin and improve the flexibility of the fibers; to further improve the properties of the base paper and reduce the usage amount of NaOH, cellulase can be further added for treatment to enhance the surface activity of the fibers and improve the binding force with the mildew-proof agent; a softening agent, a filler and a wet strength agent are added to the bleached chemical pulp. The softening agent and the filler can make the base paper softer and the surface smoother, and the wet strength agent can increase the wet strength and water resistance of the base paper, further improving the mildew-proof performance of the base paper; clear water filtration and dewatering at the wire section can ensure the uniformity of the pulp, reduce the defects of the base paper, improve the spraying uniformity, and pressing can control the paper density to avoid excessive compaction affecting the penetration of the mildew-proof agent. The paper density is preferably controlled within the range of 300–500 g / m 2 ². Drying can ensure that the moisture content of the paper is within the range of 6–10%, so as to reduce the risk of mold growth; after the base paper is formed by papermaking, a mildew-proof solution is sprayed onto the base paper. The inner layer thus prepared has a certain mildew-proof effect. The mildew-proof solution is preferably a lactic acid / chitosan quaternary ammonium salt-bronopol nano-microsphere solution. The lactic acid / chitosan quaternary ammonium salt-bronopol nano-microsphere solution can effectively slow-release the mildew-proof components and extend the mildew-proof cycle, so that the prepared mildew-proof glass release paper always has mildew-proof performance for a long time.

[0055] Preferably, in S110, the mass ratio of the bleached hardwood pulp, the bleached softwood pulp and the nanofibers is (0.8-1):(0.2-0.3):(0.05-0.3); and / or in S110, the beating degree of the beating treatment is 40-50°SR; and / or in S120, the mass ratio of the bleached chemical pulp, the softening agent, the filler and the wet strength agent is 1:(0.1-0.5):(0.1-0.5):(0.1-0.5):(0.1-0.3).

[0056] Preferably, in S120, the softening agent includes any one of trifluorochlorosilane-modified fatty amine, diene-based quaternary ammonium salt-modified fatty amine, amino-silane-modified fatty amine or polydimethylsiloxane-modified fatty amine; and / or the filler includes at least one of talc powder, calcium carbonate, palygorskite or kaolin; and / or the wet strength agent includes at least one of cationic starch, polyvinyl alcohol, sodium polyacrylate or tetramethylammonium chloride.

[0057] Furthermore, the preparation method of the lactic acid / chitosan quaternary ammonium salt-bronopol nano-microsphere solution includes:

[0058] S131. Dissolve the quaternary ammonium salt of chitosan powder in an aqueous lactic acid solution and stir to completely dissolve the quaternary ammonium salt of chitosan, obtaining an aqueous lactic acid / quaternary ammonium salt of chitosan solution;

[0059] S132. Add the bronopol solution to the aqueous lactic acid / quaternary ammonium salt of chitosan solution and mix evenly, then add an anionic polyacrylamide solution and react to prepare an aqueous lactic acid / chitosan-bronopol nanospherical microsphere solution complex;

[0060] Among them, the quaternary ammonium salt of chitosan includes N,N,N-trimethyl chitosan or hydroxypropyl trimethyl ammonium chloride chitosan.

[0061] Preferably, lactic acid itself has antibacterial activity and forms a synergistic effect with the quaternary ammonium salt of chitosan to expand the antibacterial spectrum, which can cover common glass contaminating bacteria such as Aspergillus niger and Penicillium; bronopol, as a broad-spectrum antibacterial agent, can effectively inhibit bacteria, molds and yeasts. Due to its high volatility, encapsulation with nanospheres can extend the mildew-proof period and reduce the attenuation caused by direct release; bronopol is embedded in the molecular chain of the quaternary ammonium salt of chitosan through hydrophobic interaction, and at the same time, anionic polyacrylamide and cationic chitosan form nanospheres through electrostatic self-assembly. The quaternary ammonium salt of chitosan and bronopol act synergistically, so that its mildew-proof performance is better; the quaternary ammonium salt of chitosan includes N,N,N-trimethyl chitosan or hydroxypropyl trimethyl ammonium chloride chitosan. N,N,N-trimethyl chitosan realizes cation adsorption sterilization by destroying the cell membrane structure, and its cation density is relatively high, which can enhance the antibacterial effect of bronopol; hydroxypropyl trimethyl ammonium chloride chitosan sterilizes through cell membrane adsorption and penetration, and is more likely to form a homogeneous solution with bronopol, improving the dispersibility of nanospheres.

[0062] Preferably, in S131, the temperature of the stirring treatment is 45-65°C; and / or in S131, the mass-volume ratio of the quaternary ammonium salt of chitosan to lactic acid is 1 g: 1-5 ml; and / or in S132, the mass ratio of the quaternary ammonium salt of chitosan to bronopol is 1: (0.1-1).

[0063] Furthermore, in S200, the preparation method of the silicone oil includes:

[0064] S210. Add nitrate to deionized water, stir evenly, and then add sodium borohydride for the first ultrasonic dispersion treatment to obtain silver oxide nanoparticles;

[0065] S220. Add alumina particles to methylphenyl silicone oil and stir evenly to obtain modified silicone oil;

[0066] S230. Add silver oxide nanoparticles to the modified silicone oil and stir evenly to obtain silicone oil.

[0067] Preferably, silver nitrate is used as the silver source, and sodium borohydride is used as the reducing agent. Nano silver oxide particles are prepared under ultrasonic dispersion. The nano silver oxide particles release Ag + to damage cell membranes, proteins and DNA, achieving broad-spectrum antibacterial properties; alumina particles are added to methylphenyl silicone oil. Methylphenyl silicone oil has good thermal stability and excellent lubricating properties itself. Nano-alumina filling further improves friction stability and enhances interfacial compatibility; the nano silver oxide particles are added to the modified silicone oil and stirred evenly to make the nano silver oxide particles evenly distributed in the modified silicone oil, so as to achieve the synergistic antibacterial effect of the nano silver oxide particles and the modified silicone oil. The nano silver oxide provides antibacterial and antifungal functions and can inhibit the growth of bacteria and molds; the low surface energy of methylphenyl silicone oil reduces microbial attachment and improves the durability of mildew prevention.

[0068] Preferably, in S210, the temperature of the ultrasonic dispersion treatment is 50 - 60 °C, and the time is 1 - 2 h; and / or in S220, the viscosity of the methylphenyl silicone oil is 100 - 300 cSt; and / or in S220, the particle size of the alumina particles is 50 - 120 nm; and / or in S220, the mass ratio of the alumina particles to the methylphenyl silicone oil is (0.05 - 0.2):1; and / or in S230, the mass ratio of the nano silver oxide particles to the silicone oil is (0.05 - 0.1):1.

[0069] Further, in S300, the preparation method of the polyethylene particles includes:

[0070] S310. Benzisothiazolinone and carboxymethyl cellulose are mixed and dispersed into a uniform emulsion, and then spray-treated to obtain microcapsules of benzisothiazolinone;

[0071] S320. The microcapsules of benzisothiazolinone are added to an ethanol solution of a silane coupling agent and subjected to a second ultrasonic dispersion treatment and a standing treatment in sequence to obtain surface-modified microcapsules of benzisothiazolinone;

[0072] S330. The surface-modified microcapsules of benzisothiazolinone are blended with a polyethylene matrix and then melt-extruded and pelletized to obtain polyethylene particles;

[0073] Among them, the polyethylene matrix is a mixture of low-density linear polyethylene and high-density linear polyethylene;

[0074] The mass ratio of the surface-modified microcapsules of benzisothiazolinone to the polyethylene matrix is (0.01 - 0.2):1.

[0075] Preferably, benzisothiazolinone is mixed with carboxymethyl cellulose to form a stable emulsion. The mass ratio of benzisothiazolinone to carboxymethyl cellulose is preferably 1:(3 - 5), ensuring uniform dispersion. After spray drying, microcapsules are formed, improving the stability of benzisothiazolinone and enabling its slow release, thus prolonging the mildew-proof life. A silane coupling agent is added to the microcapsules of benzisothiazolinone. The silane coupling agent provides an organosilicon functional group (-Si-O-), enhancing the bonding between the microcapsules and the polyethylene matrix and improving the dispersion stability. The silane coupling agent is preferably any one of KH-550, KH-560, or ICPES. The modified microcapsules are mixed with low-density linear polyethylene and high-density linear polyethylene, and melt-extruded and granulated. The low-density polyethylene improves the ductility and impact toughness of the release paper, and the high-density linear polyethylene provides good mechanical strength and wear resistance. The mass ratio of low-density linear polyethylene to high-density linear polyethylene is preferably 1:1. The mass ratio of the surface-modified microcapsules of benzisothiazolinone to the polyethylene matrix is (0.01 - 0.2):1, which can balance the mildew-proof effect and mechanical properties, and further make the prepared mildew-proof glass release paper have better mildew-proof effect and mechanical properties.

[0076] Preferably, the thickness of the inner layer is 30 - 50 μm, which ensures a certain mechanical strength of the inner layer while also guaranteeing sufficient loading of the mildew-proof agent, avoiding too rapid attenuation of the mildew-proof effect due to insufficient thickness. The thickness of the silicone oil layer is 5 - 10 μm, which is sufficient to form a uniform anti-sticking coating, avoiding adhesion problems and not affecting the overall flexibility. The thickness of the outer layer is 15 - 30 μm, ensuring that the glass release paper will not be easily damaged during folding, transportation, and processing.

[0077] Example 1

[0078] This example provides a preparation method of a mildew-proof glass release paper. The mildew-proof glass release paper includes an outer layer, a silicone oil layer, and an inner layer. The preparation method includes:

[0079] S100. Add papermaking aids to the pulp and stir evenly, then form paper by papermaking. Spray a mildew-proof solution on the formed paper to obtain the inner layer;

[0080] S200. Coat silicone oil on the upper surface of the inner layer to obtain an inner layer with a silicone oil layer;

[0081] S300. Melt the polyethylene particles and coat them on the surface of the silicone oil layer to obtain the mildew-proof glass release paper;

[0082] Among them, the papermaking aids include a softening agent, a filler, and a wet strength agent; S100 includes:

[0083] S110. Chemically soak bleached hardwood pulp, bleached softwood pulp and nanofibers at a mass ratio of 0.8:0.2:0.05, and then perform beating treatment until the beating degree reaches 40°SR to obtain bleached chemical pulp;

[0084] S120. Add trifluorochlorosilane-modified fatty amine, kaolin and cationic starch to the bleached chemical pulp. The mass ratio of trifluorochlorosilane-modified fatty amine, kaolin and cationic starch is 1:0.1:0.1:0.1. Filter with clear water, dehydrate at the wire section, press and dry to obtain the formed paper;

[0085] S130. Spray a mildew-proof solution on the formed paper to obtain the inner layer;

[0086] The mildew-proof solution is a lactic acid / chitosan quaternary ammonium salt-bronopol nano-microsphere solution; the thickness of the inner layer of the prepared mildew-proof glass separator paper is 30μm, the thickness of the silicone oil layer is 5μm, and the thickness of the outer layer is 15μm.

[0087] Example Two

[0088] This example provides a preparation method of a mildew-proof glass separator paper. The mildew-proof glass separator paper includes an outer layer, a silicone oil layer and an inner layer. The preparation method includes:

[0089] S100. Add papermaking aids to the pulp, stir evenly, form paper by papermaking, and spray a mildew-proof solution on the formed paper to obtain the inner layer;

[0090] S200. Coat silicone oil on the upper surface of the inner layer to obtain an inner layer with a silicone oil layer;

[0091] S300. Melt polyethylene particles and coat them on the surface of the silicone oil layer to obtain the mildew-proof glass separator paper;

[0092] Among them, the papermaking aids include softener, filler and wet strength agent; S100 includes:

[0093] S110. Chemically soak bleached hardwood pulp, bleached softwood pulp and nanofibers at a mass ratio of 1:0.3:0.3, and then perform beating treatment until the beating degree reaches 50°SR to obtain bleached chemical pulp;

[0094] S120. Add trifluorochlorosilane-modified fatty amine, palygorskite and polyvinyl alcohol to the bleached chemical pulp. The mass ratio of trifluorochlorosilane-modified fatty amine, palygorskite and polyvinyl alcohol is 1:0.5:0.5:0.3. Filter with clear water, dehydrate at the wire section, press and dry to obtain the formed paper;

[0095] S130. Spray a mildew-proof solution on the formed paper to obtain the inner layer;

[0096] The mildew-proof solution is a lactic acid / chitosan quaternary ammonium salt-bronopol nano-microsphere solution; the preparation method of the lactic acid / chitosan quaternary ammonium salt-bronopol nano-microsphere solution includes:

[0097] S131. Dissolve N,N,N-trimethylchitosan powder in an aqueous lactic acid solution and stir at 45°C until N,N,N-trimethylchitosan is completely dissolved. The mass-volume ratio of N,N,N-trimethylchitosan to lactic acid is 1 g:1 ml to obtain an aqueous lactic acid / chitosan quaternary ammonium salt solution;

[0098] S132. Add the bronopol solution to the aqueous lactic acid / chitosan quaternary ammonium salt solution and mix evenly. The mass ratio of the lactic acid / chitosan quaternary ammonium salt solution to bronopol is 1:0.1, and then dropwise add an anionic polyacrylamide solution and react to prepare a lactic acid / chitosan-bronopol nano-microsphere solution complex;

[0099] The thickness of the inner layer of the prepared mildew-proof glass release paper is 50 μm, the thickness of the silicone oil layer is 10 μm, and the thickness of the outer layer is 30 μm.

[0100] Example 3

[0101] This example provides a preparation method of a mildew-proof glass release paper. The mildew-proof glass release paper includes an outer layer, a silicone oil layer and an inner layer. The preparation method includes:

[0102] S100. Add papermaking aids to the pulp and stir evenly, then make paper by papermaking, and spray the mildew-proof solution on the formed paper to obtain the inner layer;

[0103] S200. Coat silicone oil on the upper surface of the inner layer to obtain an inner layer with a silicone oil layer;

[0104] S300. Melt the polyethylene particles and coat them on the surface of the silicone oil layer to obtain the mildew-proof glass release paper;

[0105] Among them, the papermaking aids include a softener, a filler and a wet strength agent; S100 includes:

[0106] S110. Chemically soak bleached hardwood pulp, bleached softwood pulp and nanofibers in a mass ratio of 1:0.3:0.3, and then perform beating treatment until the beating degree is 46°SR to obtain bleached chemical pulp;

[0107] S120. Add polydimethylsiloxane-modified fatty amine, talc powder and tetramethylammonium chloride to the bleached chemical pulp. The mass ratio of polydimethylsiloxane-modified fatty amine, talc powder and tetramethylammonium chloride is 1:0.3:0.3:0.2, filter with clear water, dehydrate at the wire section, press and dry to obtain the formed paper;

[0108] S130. Spray the mildew-proof solution on the formed paper to obtain the inner layer;

[0109] The mildew-proof solution is a lactic acid / chitosan quaternary ammonium salt-bronopol nano-microsphere solution; the preparation method of the lactic acid / chitosan quaternary ammonium salt-bronopol nano-microsphere solution includes:

[0110] S131. Dissolve hydroxypropyltrimethylammonium chloride chitosan powder in an aqueous lactic acid solution, and carry out stirring treatment at 65°C until the hydroxypropyltrimethylammonium chloride chitosan is completely dissolved. The mass-volume ratio of hydroxypropyltrimethylammonium chloride chitosan to lactic acid is 1 g:5 ml to obtain an aqueous lactic acid / chitosan quaternary ammonium salt solution;

[0111] S132. Add the bronopol solution to the aqueous lactic acid / chitosan quaternary ammonium salt solution and mix evenly. The mass ratio of the lactic acid / chitosan quaternary ammonium salt solution to bronopol is 1:1, and then dropwise add an anionic polyacrylamide solution and react to prepare a lactic acid / chitosan-bronopol nano-microsphere solution complex;

[0112] In S200, the preparation method of the silicone oil includes:

[0113] S210. Add nitrate to deionized water, stir evenly, and then add sodium borohydride and carry out the first ultrasonic dispersion treatment at 50°C for 2 h to obtain silver oxide nanoparticles;

[0114] S220. Add alumina particles with a particle size of 50 nm to methylphenyl silicone oil with a viscosity of 100 cSt, stir evenly, and the mass ratio of the alumina particles to the methylphenyl silicone oil is 0.05:1 to obtain modified silicone oil;

[0115] S230. Add silver oxide nanoparticles to the modified silicone oil, and the mass ratio of the silver oxide nanoparticles to the silicone oil is 0.05:1, stir evenly to obtain silicone oil;

[0116] The thickness of the inner layer of the prepared mildew-proof glass release paper is 40 μm, the thickness of the silicone oil layer is 8 μm, and the thickness of the outer layer is 22 μm.

[0117] Example 4

[0118] This example provides a preparation method of a mildew-proof glass release paper. The mildew-proof glass release paper includes an outer layer, a silicone oil layer and an inner layer. The preparation method includes:

[0119] S100. Add papermaking aids to the pulp and stir evenly, then make paper by papermaking, and spray the mildew-proof solution on the formed paper to obtain the inner layer;

[0120] S200. Coat silicone oil on the upper surface of the inner layer to obtain an inner layer with a silicone oil layer;

[0121] S300. Melt the polyethylene particles and coat them on the surface of the silicone oil layer to obtain the mildew-proof glass release paper;

[0122] Among them, the papermaking aids include softeners, fillers and wet strength agents; S100 includes:

[0123] S110. Chemically soak bleached hardwood pulp, bleached softwood pulp and nanofibers in a mass ratio of 1:0.3:0.3, and then perform beating treatment until the beating degree reaches 45°SR to obtain bleached chemical pulp;

[0124] S120. Add amino-silane modified fatty amine, calcium carbonate and sodium polyacrylate to the bleached chemical pulp. The mass ratio of amino-silane modified fatty amine, calcium carbonate and sodium polyacrylate is 1:0.3:0.3:0.2. Filter with clear water, dehydrate at the wire section, press and dry to obtain the formed paper;

[0125] S130. Spray the anti-mildew solution on the formed paper to obtain the inner layer;

[0126] The anti-mildew solution is a lactic acid / chitosan quaternary ammonium salt-bronopol nano microsphere solution; the preparation method of the lactic acid / chitosan quaternary ammonium salt-bronopol nano microsphere solution includes:

[0127] S131. Dissolve hydroxypropyltrimethylammonium chloride chitosan powder in lactic acid aqueous solution and stir at 65°C until the hydroxypropyltrimethylammonium chloride chitosan is completely dissolved. The mass-volume ratio of hydroxypropyltrimethylammonium chloride chitosan to lactic acid is 1g:5ml to obtain lactic acid / chitosan quaternary ammonium salt aqueous solution;

[0128] S132. Add the bronopol solution to the lactic acid / chitosan quaternary ammonium salt aqueous solution and mix evenly. The mass ratio of the lactic acid / chitosan quaternary ammonium salt solution to bronopol is 1:1, and then dropwise add an anionic polyacrylamide solution and react to prepare a lactic acid / chitosan-bronopol nano microsphere solution complex;

[0129] In S200, the preparation method of the silicone oil includes:

[0130] S210. Add nitrate to deionized water, stir evenly, and then add sodium borohydride and perform the first ultrasonic dispersion treatment at 50°C for 2h to obtain silver nano-oxide particles;

[0131] S220. Add alumina particles with a particle size of 50nm to methylphenyl silicone oil with a viscosity of 100cSt and stir evenly. The mass ratio of alumina particles to methylphenyl silicone oil is 0.05:1 to obtain modified silicone oil;

[0132] S230. Add silver nano-oxide particles to the modified silicone oil. The mass ratio of silver nano-oxide particles to silicone oil is 0.05:1, and stir evenly to obtain silicone oil;

[0133] In S300, the preparation method of the polyethylene particles includes:

[0134] S310. Mix benzisothiazolinone and carboxymethyl cellulose in a mass ratio of 1:3, disperse them into a uniform emulsion, and then perform spray treatment to obtain microcapsules of benzisothiazolinone;

[0135] S320. Add the microcapsules of benzisothiazolinone to an ethanol solution of KH-550, and perform second ultrasonic dispersion treatment and static treatment in sequence to obtain surface-modified microcapsules of benzisothiazolinone;

[0136] S330. Blend the surface-modified microcapsules of benzisothiazolinone with a polyethylene matrix and then melt-extrude and granulate to obtain polyethylene particles;

[0137] Among them, the polyethylene matrix is a mixture of low-density linear polyethylene and high-density linear polyethylene, and the mass ratio of low-density linear polyethylene to high-density linear polyethylene in the polyethylene matrix is 1:1;

[0138] The mass ratio of the surface-modified microcapsules of benzisothiazolinone to the polyethylene matrix is 0.01:1;

[0139] The thickness of the inner layer of the prepared mildew-proof glass release paper is 40 μm, the thickness of the silicone oil layer is 8 μm, and the thickness of the outer layer is 22 μm.

[0140] Performance Test

[0141] Prepare mildew-proof glass release paper by using the preparation method of the mildew-proof glass release paper in Examples 1-4, and conduct the following tests on the mildew-proof glass release paper prepared in Examples 1-4: Mildew-proof performance test: Conduct the mildew-proof performance test on the mildew-proof glass release paper prepared in Examples 1-4 according to GB / T 2423.16-2008; Water vapor transmission rate test: Conduct the water vapor transmission rate test on the mildew-proof glass release paper prepared in Examples 1-4 according to GB / T 1037-1988; Volatile organic compound (VOC) test: Conduct the VOC test on the mildew-proof glass release paper prepared in Examples 1-4 according to GB / T 23985-2009. The test results are shown in Table 1.

[0142] Table 1

[0143]

[0144] As can be seen from Table 1, the mildew-proof glass release paper prepared by using the preparation method of the mildew-proof glass release paper in Examples 1-4 has excellent mildew-proof performance, and there is no VOC emission, which is environmentally friendly. Especially the mildew-proof glass release paper in Example 4, which may be because in Example 4, the preparation methods of the lactic acid / chitosan quaternary ammonium salt-bromonitropropanol nanomicrosphere solution, the silicone oil, and the polyethylene particles recorded in the present invention are adopted, so that the performance of the prepared mildew-proof glass release paper is better.

[0145] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing mildew-proof glass isolation paper, characterized in that: The mildew-proof glass isolation paper comprises an outer layer, a silicone oil layer and an inner layer, and the preparation method comprises: S100, adding a papermaking aid to the pulp and stirring evenly, making paper, and spraying an anti-mildew solution on the paper to obtain the inner layer; S200, coating the upper surface of the inner layer with silicone oil to obtain an inner layer having a silicone oil layer; S300, melting polyethylene particles and coating them on the surface of the silicone oil layer to obtain the mildew-proof glass isolation paper; Wherein, the papermaking additives include softeners, fillers and wet strength agents; the S100 includes: S110, chemically soaking the bleached hardwood pulp, the bleached softwood pulp and the nanofibers and then beating them to obtain bleached chemical pulp; S120, adding the softener, the filler and the wet strength agent to the bleached chemical pulp, filtering with clean water, dehydrating on a wire, pressing and drying to obtain the finished paper; S130, spraying an anti-mildew solution onto the finished paper to obtain the inner layer; The anti-mildew solution is a lactic acid / chitosan quaternary ammonium salt-bronopol nano-microsphere solution.

2. The preparation method according to claim 1, characterized in that: In S110, the mass ratio of the bleached hardwood pulp, the bleached softwood pulp and the nanofiber is (0.8-1): (0.2-0.3): (0.05-0.3); and / or In S110, the beating degree of the beating treatment is 40-50°SR; and or In the S120, the mass ratio of the bleached chemical pulp, the softener, the filler and the wet strength agent is 1:(0.1-0.5):(0.1-0.5):(0.1-0.5):(0.1-0.3).

3. The preparation method according to claim 1, characterized in that: In the S120, The softener includes any one of trifluorochlorosilane-modified fatty amine, dienyl quaternary ammonium salt-modified fatty amine, aminosilane-modified fatty amine or polydimethylsiloxy-modified fatty amine; and / or The filler comprises at least one of talc, calcium carbonate, palygorskite or kaolin; and / or The wet strength agent includes at least one of cationic starch, polyvinyl alcohol, sodium polyacrylate or tetramethylammonium chloride.

4. The preparation method according to claim 1, characterized in that: The preparation method of the lactic acid / chitosan quaternary ammonium salt-bronopol nanosphere solution comprises: S131, dissolving chitosan quaternary ammonium salt powder in a lactic acid aqueous solution and stirring to completely dissolve the chitosan quaternary ammonium salt to obtain a lactic acid / chitosan quaternary ammonium salt aqueous solution; S132, adding the bronopol solution to the lactic acid / chitosan quaternary ammonium salt aqueous solution and mixing evenly, and then dropping the anionic polyacrylamide solution to react to prepare a lactic acid / chitosan-bronopol nanosphere solution complex; Wherein, the chitosan quaternary ammonium salt includes N,N,N-trimethyl chitosan or hydroxypropyltrimethylammonium chloride chitosan.

5. The preparation method according to claim 4, characterized in that: In S131, the stirring temperature is 45-65° C.; and / or In S131, the mass volume ratio of the chitosan quaternary ammonium salt to the lactic acid is 1g:1-5ml; and / or In the S132, the mass ratio of the chitosan quaternary ammonium salt to the bronopol is 1:(0.1-1).

6. The preparation method according to claim 1, characterized in that: In S200, the method for preparing the silicone oil includes: S210, adding nitrate to deionized water, stirring evenly, and then adding sodium borohydride to perform a first ultrasonic dispersion treatment to obtain nano silver oxide particles; S220, adding aluminum oxide particles to methylphenyl silicone oil, stirring evenly, to obtain modified silicone oil; S230, adding the nano silver oxide particles to the modified silicone oil, stirring evenly, to obtain the silicone oil.

7. The preparation method according to claim 6, characterized in that: In S210, the temperature of the ultrasonic dispersion treatment is 50-60° C. and the time is 1-2 h; and / or In the S220, the viscosity of the methylphenyl silicone oil is 100-300 cSt; and / or In S220, the particle size of the aluminum oxide particles is 50-120 nm; and / or In the S220, the mass ratio of the aluminum oxide particles to the methylphenyl silicone oil is (0.05-0.2):1; and / or In the S230, the mass ratio of the nano silver oxide particles to the silicone oil is (0.05-0.1):

1.

8. The preparation method according to claim 1, characterized in that: In S300, the method for preparing the polyethylene particles comprises: S310, mixing benzisothiazolinone and carboxymethyl cellulose and dispersing them into a uniform emulsion, and then spraying them to obtain microcapsules of benzisothiazolinone; S320, adding the benzisothiazolinone microcapsules to an ethanol solution of a silane coupling agent, and sequentially performing a second ultrasonic dispersion treatment and a static treatment to obtain surface-modified benzisothiazolinone microcapsules; S330, blending the surface-modified benzisothiazolinone microcapsules with a polyethylene matrix and then melt-extruding and granulating the mixture to obtain the polyethylene particles; Wherein, the polyethylene matrix is ​​a mixture of low-density linear polyethylene and high-density linear polyethylene; The mass ratio of the surface modified benzisothiazolinone microcapsules to the polyethylene matrix is ​​(0.01-0.2):

1.

9. The preparation method according to claim 1, characterized in that: The thickness of the inner layer is 30-50 μm; and / or The thickness of the silicone oil layer is 5-10 μm; and / or The thickness of the outer layer is 15-30 μm.

10. A mildew-proof glass isolation paper, characterized in that: The mildew-proof glass isolation paper is prepared by the preparation method as described in any one of claims 1 to 9.

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