An organosilicon coating solution, its preparation method and product

Abstract

The present invention relates to the field of packaging paper processing technology, and provides an organosilicon coating liquid, a preparation method thereof, and a product thereof. The organosilicon coating liquid includes an organosilicon composition, which comprises the following raw material components by weight: 8-25 parts of vinyl silicone rubber, 8-25 parts of vinyl silicone oil, 5-30 parts of vinyl MQ resin, 1-5 parts of high-hydrogen silicone oil, 1-15 parts of high-temperature resistant inorganic fiber, 1-30 parts of gas-phase inorganic filler, 0.05-1.5 parts of photoinitiator, and 0.5-5 parts of catalyst. The organosilicon coating liquid can be directly applied to the surface of a base paper substrate, and the prepared packaging paper has the advantages of being resistant to high temperatures, not prone to water loss and curling, and having no obvious color difference between the surface after high-temperature coating and the surface before coating. The preparation method is simple in process, does not require laminating and plasticizing treatment, meets current environmental protection requirements, and reduces production costs.

Description

Technical Field

[0001] The present invention relates to the technical field of silicone coating liquids, and particularly relates to a silicone coating liquid, a preparation method thereof, and an article. Background Art

[0002] In daily life, due to the development and popularization of electronic products, manufacturers pay more attention to packaging design and quality, which are the first senses and experiences of consumers. To improve the consumer experience and meet the worldviews and values of the public, currently, the main packaging material in the market is green and environmentally friendly paper. However, the original paper has the disadvantage of being easy to absorb water, resulting in a decline in its performance in actual packaging applications, and problems such as the deformation of the packaging box and damage to electronic products are likely to occur during transportation or transfer. Therefore, the original paper needs to be sealed before being used to produce packaging boxes or packaging tapes to provide stable quality assurance for subsequent use. During the use of paper packaging, double-sided tapes are often used for bonding. The double-sided tape is mainly made by coating pressure-sensitive adhesives on both sides of a substrate. Its process is complex, uses many materials and has a high cost. Most of the substrates use PET materials, bringing degradation pressure to subsequent environmental protection. Therefore, if a glue layer can be directly coated on the packaging paper, it not only reduces costs and improves production efficiency but also improves environmental performance.

[0003] However, ordinary packaging paper often does not have the performance of direct coating, mainly manifested in poor heat resistance, easy water loss and curling, liquid penetration during coating resulting in changes in its appearance, and some need high-temperature curing glue, which causes abnormal phenomena such as yellowing of the original paper and obvious color difference compared with the initial state at high temperatures.

[0004] For the paper that can be bought in the market, except for modifying the wood pulp fibers during the production of the original paper, the following two technical solutions are mainly used for the subsequent surface treatment of the packaging-coated original paper: First, surface film laminating and plasticizing treatment is carried out on the paper used for coating, such as laminating PE film, CPP film, and plastic films with a relatively low softening point; this technical solution adds polymer materials, does not meet the current environmental protection requirements for plasticization removal, and increases the difficulty of subsequent material recycling and degradation; at the same time, the plastic used for film laminating treatment has a relatively low softening point, and abnormal phenomena such as film laminating bubbles and surface shrinkage at high temperatures may occur during the subsequent coating treatment process; Second, a certain thickness of other films such as PET and BOPP is laminated on the surface of the packaging paper with an adhesive, making it have obvious high temperature resistance and super tensile resistance, showing the performance of the laminated polymer film, which brings great convenience to subsequent coating processing; however, this technical solution has a relatively complex process, also does not meet the current environmental protection requirements for plasticization removal, and has a high cost, changing the easy bending performance, appearance, and touch feel of the original paper, and is rarely used for direct packaging boxes in the market.

[0005] Therefore, it is of great significance to develop a coating that can be directly coated on packaging paper and has high temperature resistance, is not easy to curl due to water loss, and has no obvious color difference between the surface after high temperature coating and the surface before coating. Summary of the Invention

[0006] The present invention aims to overcome the aforementioned problems of the prior art by providing an organosilicon coating liquid, a method for preparing the same, and products containing the same. The organosilicon coating liquid provided by the present invention can be directly applied to the surface of a base paper substrate, resulting in coated products exhibiting advantages such as high temperature resistance, resistance to water loss and curling, and no significant color difference between the paper surface before and after high-temperature coating. The preparation method is simple, requires no lamination or plasticizing treatment, meets current environmental protection requirements, and reduces production costs.

[0007] In order to achieve the above-mentioned purpose, the first aspect of the present invention provides an organosilicon coating liquid, which includes an organosilicon composition. The organosilicon composition includes the following raw material components by weight: 8-25 parts of vinyl silicone rubber, 8-25 parts of vinyl silicone oil, 5-30 parts of vinyl MQ resin, 1-5 parts of high hydrogen silicone oil, 1-15 parts of high temperature resistant inorganic fiber, 1-30 parts of gas phase inorganic filler, 0.05-1.5 parts of photoinitiator, and 0.5-5 parts of catalyst.

[0008] The inventors of the present invention have discovered that vinyl silicone rubber, vinyl silicone oil, vinyl MQ resin and high-hydrogen silicone oil within a specific ratio range can form a dense functional coating by cross-linking under the action of auxiliary agents (such as initiators and catalysts). After adhering to the base paper substrate, the hydrophobic groups such as methyl groups on the surface of the coating have hydrophobic properties, which enables the silicone coating to prevent external water absorption at low temperatures and internal water loss at high temperatures. In addition, adding high-temperature resistant inorganic fibers and gas-phase inorganic fillers within a specific ratio range to the silicone composition can improve the thermal resistance and high-temperature stability of the silicone coating, thereby improving the temperature resistance of the packaging paper containing the functional coating.

[0009] By adopting the above solution, the organosilicon coating prepared by the organosilicon coating liquid has the properties of being waterproof and temperature-resistant. In order to further improve the effect, one or more of the technical features can be further optimized.

[0010] In one embodiment, the silicone composition includes the following raw material components by weight: 10-20 parts of vinyl silicone rubber, 10-20 parts of vinyl silicone oil, 7-21 parts of vinyl MQ resin, 2-3 parts of high hydrogen silicone oil, 3-11 parts of high temperature resistant inorganic fiber, 8-21 parts of gas phase inorganic filler, 0.1-1.2 parts of photoinitiator, and 1-2.5 parts of catalyst.

[0011] Further optimizing the content ratio relationship of each component in the silicone composition can make the synergistic effect of each component better, and the waterproof performance and high-temperature resistance of the prepared silicone coating are better.

[0012] In one example, the gaseous inorganic filler includes fumed aluminum oxide and / or fumed silica, and fumed titanium dioxide; preferably, the gaseous inorganic filler includes fumed aluminum oxide, fumed silica, and fumed titanium dioxide.

[0013] The primary particle size of fumed aluminum oxide is 10 - 30 nm, and the primary particle size of fumed silica is 7 - 40 nm. Selecting fumed aluminum oxide and / or fumed silica can make it disperse and fill in the silicone coating more uniformly without affecting its appearance performance and bonding performance. Fumed titanium dioxide has an average particle size of about 21 nm. Using nanoscale fumed titanium dioxide can avoid affecting the appearance of the silicone layer, and titanium dioxide has the effect of shading and whitening, which can improve the problem of color difference change before and after the base paper treatment.

[0014] The primary particle size refers to the arithmetic mean of the diameters of the primary particles in a single gaseous inorganic filler or its aggregate, which can be measured by the transmission electron microscopy measurement method.

[0015] In one example, the mass ratio of the fumed aluminum oxide to the fumed silica is (0.5 - 3):1; preferably, the mass ratio of the fumed aluminum oxide to the fumed silica is 1(-2):1.

[0016] The inventors of the present invention found that limiting the mass ratio of fumed aluminum oxide and fumed silica within the above range (including the end point values) can make the silicone coating obtain better thermal conductivity and appearance. If the mass ratio is higher than the above range, the content of aluminum oxide is higher. Since aluminum oxide has certain thermal conductivity, it will affect the internal thermal stability of the silicone rubber layer, and the silicone rubber layer is prone to turn yellow after high-temperature baking, affecting the appearance; if the mass ratio is lower than the above range, the content of silica is higher. Since the silicon-oxygen bond in silica will form a bridging effect with the hydrogen bond in vinyl silicone rubber to cause crosslinking, the crosslinking effect of the product becomes stronger, and the silicone rubber layer is prone to warp after high temperature.

[0017] In one example, the gaseous inorganic filler, by weight, includes 1 - 8 parts of fumed aluminum oxide, 0.5 - 5 parts of fumed silica, and 3 - 13 parts of fumed titanium dioxide. The inventors of the present invention found that by using the above three components and limiting the ratio of the three components within the above range, a silicone rubber layer with better high-temperature resistance and no color difference after high-temperature baking can be obtained.

[0018] In the present invention, the vinyl silicone rubber is a silicone rubber containing vinyl groups. The vinyl groups can be end groups, side chain groups, or both end groups and side chain groups simultaneously. There is no specific limitation on the specific type of vinyl silicone rubber, as long as it is a silicone rubber in which vinyl groups participate in chemical reactions as functional groups, it is within the protection scope of the present invention.

[0019] In one example, the vinyl silicone rubber is selected from one or a combination of vinyl-terminated organosilicon raw rubber, methyl vinyl silicone rubber, and methyl phenyl vinyl silicone rubber.

[0020] In a preferred example, the vinyl silicone rubber is vinyl-terminated organosilicon raw rubber.

[0021] In one example, the molecular weight of the vinyl silicone rubber is 200 kDa - 1000 kDa, for example, it can be 200 kDa, 300 kDa, 400 kDa, 500 kDa, 600 kDa, 700 kDa, 800 kDa, 900 kDa, 1000 kDa; preferably 300 - 900 kDa.

[0022] Defining and preferably specifying the specific type and molecular weight of the vinyl silicone rubber within a specific range can better exert the synergistic effect of the vinyl silicone rubber with other components, further improve the adhesion of the silicone coating solution, and make it easier to coat on the surface of the base paper substrate. Generally speaking, the larger the molecular weight of the vinyl silicone rubber, the lower the vinyl content, and fewer vinyl groups participate in the reaction. However, if the vinyl content is too low, the cohesive strength within the silicone layer is low, resulting in coating peeling off; the smaller the molecular weight of the vinyl silicone rubber, the higher the vinyl content, and more vinyl groups can participate in the reaction with other components. However, if the vinyl content is too high, the overall silicone layer will become hard, changing the overall stiffness and flexibility of the product.

[0023] In the present invention, the vinyl silicone oil is an organosilicon compound containing vinyl groups, which has both silicon-oxygen bonds and carbon-carbon double bonds in its molecule. The molar content of vinyl in the vinyl silicone oil is 0.8 - 1.8 mol%.

[0024] In one example, the viscosity of the vinyl silicone oil is 200 - 900 mPa·s, for example, it can be 200 mPa·s, 300 mPa·s, 400 mPa·s, 500 mPa·s, 600 mPa·s, 700 mPa·s, 800 mPa·s, 900 mPa·s; preferably 300 - 800 mPa·s.

[0025] Defining and preferably specifying the molar content and viscosity of vinyl in the vinyl silicone oil can further improve the flexibility and adhesion of the silicone coating solution, and improve the temperature resistance and water resistance of the functional coating.

[0026] In the present invention, the vinyl MQ resin is an organic / inorganic hybrid polyorganosiloxane with a special structure ratio, which is composed of monofunctional chain units (R3SiO 1 / 2 abbreviated as M unit "mono") and tetrafunctional chain units (SiO 4 / 2 abbreviated as Q unit "quad").

[0027] In one example, the ratio of M:Q in the vinyl MQ resin is (0.5 - 1.2):1, for example, it can be 0.5:1, 0.6:1, 0.7:1, 0.8:1, 0.9:1, 1:1, 1.1:1, 1.2:1; preferably (0.6 - 1):1.

[0028] The vinyl MQ resin has a viscosity-increasing and reinforcing effect on the silicone coating solution. It is consistent with the main groups of vinyl silicone rubber, improving the compatibility between the vinyl MQ silicone resin and vinyl silicone rubber, and making the low-temperature adhesion of the silicone rubber layer better.

[0029] In one example, the hydrogen content of the high-hydrogen silicone oil is 1.4% - 1.6%.

[0030] The silicon-hydrogen groups in the high-hydrogen silicone oil can undergo addition cross-linking reactions with the vinyl groups in the vinyl silicone oil. Defining and preferably controlling the addition amount and hydrogen content of the high-hydrogen silicone oil can improve the curing performance of the silicone coating solution and enhance the compactness of the functional coating.

[0031] In the present invention, the high-temperature resistant inorganic fibers can be fibers prepared from materials such as metal salts, metal oxides, and metal hydroxides with high-temperature resistant properties that are commonly used in the art.

[0032] In one example, the high-temperature resistant inorganic fibers include amorphous inorganic fibers and / or polycrystalline inorganic fibers. Exemplarily, the amorphous inorganic fibers include aluminosilicate, magnesium silicate, high-purity aluminosilicate, chromium-containing aluminosilicate, and high-aluminum fibers; the polycrystalline inorganic fibers include mullite fibers, aluminum oxide fibers, and zirconia fibers.

[0033] In one example, the high-temperature resistant inorganic fibers are selected from one or more of aluminosilicate fibers, magnesium silicate fibers, high-purity aluminosilicate fibers, and chromium-containing aluminosilicate fibers.

[0034] In one example, the high-temperature resistant inorganic fibers are selected from aluminosilicate fibers. Aluminosilicate fibers have the advantages of high temperature resistance, good thermal stability, low thermal conductivity, and small thermal expansion, and can be used in refractory materials. The inventors of the present invention found that using aluminosilicate fibers in the silicone rubber layer can effectively improve the high-temperature resistance of the silicone coating.

[0035] In one example, the length of the high-temperature resistant inorganic fiber is 0.5 μm - 10 μm, and the diameter is 1 nm - 1000 nm. Preferably, the length of the high-temperature resistant inorganic fiber is 1 μm - 5 μm, and the diameter is 10 nm - 100 nm. Defining and preferably setting the length and diameter of the high-temperature resistant inorganic fiber can make the mixing effect of the inorganic fiber and the gaseous inorganic filler better, the coating on the paper surface more uniform, the appearance smoother, and better play the high-temperature resistant role of the high-temperature resistant inorganic fiber.

[0036] In the present invention, after mixing nano-scale inorganic fillers and high-temperature resistant inorganic fibers with nano-scale diameters, they can be better dispersed in the matrix of silicone rubber to form a better low thermal conductivity and high-temperature stability coating, further improving the high-temperature resistance performance of the treated packaging paper. The small sizes of the inorganic fillers and high-temperature resistant inorganic fibers will cause them to be unable to be uniformly dispersed in the silicone rubber coating, affecting the product performance; if their sizes are large, it will affect the product appearance.

[0037] In one example, the photoinitiator can be a free radical photoinitiator, for example, it can include benzoin and its derivatives, benzil and its derivatives, α-hydroxyalkyl phenyl ketones, α-aminoalkyl phenyl ketones, acylphosphine oxides, benzophenones, and heterocyclic aromatic ketones, etc.

[0038] In one example, the photoinitiator is selected from one or more of 1-hydroxy-cyclohexyl-phenyl ketone (Irgacure184), 2-methyl-1-(4-methylthiophenyl)-2-morpholin-1-propanone (Irgacure907), 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)butanone (Irgacure369), phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide (Irgacure819), 1,1'-(methylenedi-4,1-phenylene)bis[2-hydroxy-2-methyl-1-propanone] (Irgacure127), such as 2-hydroxy-methylphenyl propane-1-one (Darocure1173), 2,4,6-trimethylbenzoyl-diphenylphosphine oxide TPO, ethyl 2,4,6-trimethylbenzoyl phenylphosphinate TPO-L, 2-hydroxy-4-(2-hydroxyethoxy)-2-methylpropiophenone (Darocure2959), benzophenone (BP), 2,4,6-trimethylbenzophenone, tetraethyl Michler's ketone (DEMK), isopropylthioxanthone (ITX), 1-chloro-4-propoxythioxanthone (CPTX), and photoinitiator EDAB (1101).

[0039] In one example, the catalyst is a platinum catalyst with a photocatalytic effect.

[0040] In one example, the platinum catalyst can be any one of platinum black, platinum chloride, chloroplatinic acid, the complex of chloroplatinic acid and monohydric alcohol, the complex of chloroplatinic acid and olefins, the chelate of platinum vinyl siloxane or bis(acetylacetonato)platinum.

[0041] In one example, the platinum catalyst is selected from one or a combination of more of trimethylmethylcyclopentadienylplatinum(IV) [(Me-Cp)Pt(Me)3], platinum(II) acetylacetonate [Pt(acac)2] and cis-dichlorobis(triphenylphosphine)platinum(II).

[0042] The synergistic effect of the free radical photoinitiator and the platinum catalyst enables the silicone system of the organosilicon composition of the present invention to crosslink and add at a faster reaction rate, shortening the process time.

[0043] The second aspect of the present invention provides a method for preparing an organosilicon coating solution, comprising the following steps:

[0044] (1) According to the formulation ratio of the organosilicon coating solution, weigh vinyl silicone rubber and add it to the first mixing and stirring device. Weigh the high-temperature resistant inorganic fiber and the gaseous inorganic filler and add them to the first mixing and stirring device in several times, and mix and stir to obtain material S1;

[0045] (2) According to the formulation ratio of the organosilicon coating solution, weigh vinyl MQ resin, high hydrogen content silicone oil and vinyl silicone oil and add them to the second mixing and stirring device, and mix and stir until the vinyl MQ resin is dissolved; then add material S1 to the second mixing and stirring device and mix and stir to obtain material S2;

[0046] (3) Add material S2 to the batching container, add the formulated amount of photoinitiator and mix and stir, and then weigh the formulated amount of catalyst and add it to the batching container and mix and stir to obtain material S3.

[0047] In one example, the first mixing and stirring device can be a kneader.

[0048] In one example, the second mixing and stirring device can be a three-roll mill.

[0049] In one example, the method for preparing the organosilicon coating solution comprises the following steps:

[0050] (a) Weigh vinyl silicone rubber according to the formulation ratio of the above silicone composition and add it to a kneader. Weigh high-temperature resistant fibers, fumed aluminum trioxide, and fumed silica, and add them to the kneader in three portions (for example, add 2 / 5, 2 / 5, and 1 / 5 each time), with an interval of 8 - 15 minutes between each addition; then weigh fumed titanium dioxide according to the ratio and add it to the kneader in the same method as above, and knead for 6 - 10 hours; heat the kneader to 110 - 130 °C, adjust the vacuum degree to not higher than -0.1 MPa, and maintain for 20 - 40 minutes; obtain material S1;

[0051] (b) Weigh vinyl MQ resin, high hydrogen content silicone oil, and vinyl silicone oil according to the formulation ratio of the above silicone composition and pour them into a three-roll mixer. After about 25 - 40 minutes, when the vinyl MQ resin is fully dissolved; then put material S1 into the three-roll mixer, stir and mix thoroughly at 700 - 1000 revolutions per minute, and after mixing for 4 - 6 hours, obtain material S2, and store it sealed;

[0052] (c) Start on-site batching about 1 hour before the coating process. First, add the above-mixed material S2 into the batching container, add the formulated amount of photoinitiator, disperse with a stir-disk disperser for 15 - 30 minutes, then weigh the formulated amount of catalyst and add it to the batching container and stir for 15 - 30 minutes, with a rotation speed of 500 - 800 revolutions per minute; finally, let it stand for defoaming for 15 - 30 minutes to obtain coating liquid S3.

[0053] Among them, in step (a), adding the high-temperature resistant fibers, fumed aluminum trioxide, and fumed silica in multiple portions can make the high-temperature resistant fibers and fumed inorganic fillers better dispersed and filled in the vinyl silicone rubber.

[0054] In step (a), adding fumed titanium dioxide separately in multiple portions can better exert the light-shielding and whitening effect of the inorganic filler.

[0055] In step (c), the batching container used is preferably made of a stainless steel barrel, and at the same time, it is sealed with a barrel lid and operated in a yellow light environment to improve the quality stability of the silicone coating liquid.

[0056] The third aspect of the present invention provides a product, including a substrate and functional coatings coated on both side surfaces of the substrate, where the functional coatings are prepared from the silicone coating liquid described in the first aspect of the present invention, or include the silicone coating liquid prepared by the method described in the second aspect of the present invention.

[0057] There is no limitation on the specific product form of the product. As long as it is a silicone coating prepared from the silicone coating liquid of the present invention, it is included in the scope of this product. For example, the product can be packaging paper, tape, protective film, label paper, etc.

[0058] In one embodiment, the product is a wrapping paper, which comprises a base paper substrate and functional coatings coated on both surfaces of the base paper substrate; the functional coatings are prepared from the silicone coating liquid described in the first aspect of the present invention, or are prepared from the silicone coating liquid prepared by the method described in the second aspect of the present invention.

[0059] In the present invention, the "base paper substrate" refers to ordinary paper that has not been processed by processes such as coating, surface lamination and plasticization, and compounding with other films.

[0060] In one example, the thickness of the functional coating is 1 μm - 5 μm.

[0061] In one example, the method for preparing the wrapping paper may include: coating the above-mentioned silicone coating liquid on both surfaces of the base paper substrate to form a functional coating.

[0062] In one example, the method for preparing the wrapping paper includes the following steps: under a yellow light working environment, using a ceramic gravure roll with a mesh count of about 250 to coat the silicone coating liquid on the surface of the base paper substrate, and controlling the coating amount to 0.8 ± 0.3 g / m 2 ; UV irradiation, with a radiation energy of 50 - 90 mW / cm 2 , a machine speed of 20 - 50 m / min, and coating one side of the base paper substrate; after winding, perform the same process and formulation to coat the other side of the base paper substrate (the opposite side of the coated surface of the base paper substrate), and finally let the rolled material hang in the air at room temperature for about 5 days.

[0063] Using a yellow light working environment can avoid the curing of the above-mentioned coating liquid before coating on the surface of the substrate.

[0064] In one example, the schematic structural diagram of the wrapping paper is as Figure 1 shown, including a base paper substrate 1 and functional coatings 2 coated on two surfaces of the base paper substrate 1.

[0065] The wrapping paper provided by the present invention, due to the presence of the functional coating, has the advantages of high temperature resistance, not being prone to water loss and curling, and having no obvious color difference between the surface after high-temperature coating and the surface before coating. This wrapping paper can not only be used as an ordinary packaging box, but also, due to its high-temperature coating performance, improves the basic environment of the processed paper, enabling it to be used under more severe conditions, such as high temperature and high humidity conditions, reducing the deformation of the paper box caused by environmental influence, and greatly protecting the packaged products.

[0066] The wrapping paper provided by the present invention expands the use of surface treatment paper. It can be used for high-temperature coating, and can be made into high-temperature resistant tapes or protective films, etc., without the need to use double-sided tape for bonding. From the fundamental design and production process, it saves energy and reduces emissions, achieving an environmental protection effect. At the same time, it realizes plasticization removal, providing basic technical support for the degradation and recycling of packaging materials after use.

[0067] The endpoints and any values disclosed in this article for a range are not limited to the exact range or value. These ranges or values should be understood to include values close to these ranges or values. For numerical ranges, the endpoint values of each range, between the endpoint values of each range and individual point values, and between individual point values can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be regarded as specifically disclosed in this article.

[0068] The present invention adopts the above technical solutions and has the following beneficial effects:

[0069] (1) The silicone coating solution provided by the present invention has the functions of preventing external water absorption at low temperatures and preventing internal water loss at high temperatures, as well as low thermal conductivity and high-temperature stability;

[0070] (2) The wrapping paper provided by the present invention has the advantages of high temperature resistance, not being prone to water loss and curling, and having no obvious color difference between the surface after high-temperature coating and the surface before coating;

[0071] (3) The wrapping paper provided by the present invention has the advantages of environmental protection, wide use, and easy promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] Figure 1 The structure diagram of the wrapping paper in an example of the present invention is shown.

[0073] Reference numerals: 1 - base paper substrate; 2 - functional coating. DETAILED DESCRIPTION OF THE INVENTION

[0074] The following details the specific embodiments of the present invention. It should be understood that the specific embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not used to limit the present invention.

[0075] Unless otherwise defined, all scientific and technical terms used in the present invention have the same meaning as commonly understood by those skilled in the technical field to which the present invention pertains.

[0076] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0077] For the materials, reagents, etc. used in the following examples, unless otherwise specified, they can all be obtained commercially.

[0078] The present invention will be described in detail below with reference to specific examples, which are used for understanding rather than limiting the present invention.

[0079] Example 1

[0080] 1. Prepare the components of the silicone composition:

[0081] Vinyl silicone rubber: Methyl vinyl silicone rubber 110-2, 15 parts by weight;

[0082] Vinyl silicone oil: RH-Vi311, 15 parts by weight, with a viscosity of 300-800 mPa·s;

[0083] Vinyl MQ resin: DY-VMQ101 (the ratio of M:Q is 0.71), 14 parts by weight;

[0084] High hydrogen content silicone oil: DC7028 (hydrogen content is 1.5%), 2.5 parts by weight;

[0085] High temperature resistant inorganic fiber: High temperature type aluminum silicate fiber, 8.1 parts by weight; with a length within 5 μm and a diameter at the nanometer level;

[0086] Gas phase inorganic filler: Gas phase aluminum oxide ALUNA-100, 3.24 parts by weight; Hydrophobic gas phase silica (fumed silica) HB-139, 2.16 parts by weight; Titanium dioxide: VK-T25SG, 8 parts by weight;

[0087] Photoinitiator: IRGACURE 184, 0.6 parts by weight;

[0088] Platinum catalyst: MeCpPtMe3, 1.8 parts by weight.

[0089] 2. Prepare the silicone coating solution using the following preparation method:

[0090] (1) Weigh the vinyl silicone rubber according to the formula ratio and add it to a kneader. Weigh the high temperature type aluminum silicate fiber, gas phase aluminum oxide and hydrophobic gas phase silica according to the ratio, and add them to the kneader in 3 times, adding 2 / 5, 2 / 5, 1 / 5 respectively, with an interval of 10 min each time; then weigh the titanium dioxide and add it to the kneader in the same way. It is preferably kneaded by the kneader for 8 h; the kneader is heated to 120 °C, the vacuum degree is adjusted to -0.1 MPa, and maintained for 30 min; after cooling to room temperature, the material S1 is obtained under pressure relief;

[0091] (2) Weigh vinyl MQ resin, high-hydrogen-content silicone oil and vinyl silicone oil, and pour them into a three-roll mixer. After the resin is fully dissolved, about 30 minutes later; then put the kneaded material S1 into the three-roll mixer, stir and mix thoroughly at 800 revolutions per minute. After mixing for 5 hours, obtain material S2 and store it sealed.

[0092] (3) Start on-site batching 60 minutes before coating. First, add the above-mentioned well-mixed material S2 into the batching bucket, add the formulated amount of photoinitiator, disperse with a stir-disk disperser for 20 minutes, then weigh the formulated amount of catalyst and add it into the bucket and stir for 20 minutes at a speed of 600 revolutions per minute; finally, let it stand for defoaming for 20 minutes to obtain coating liquid S3; use a stainless-steel bucket throughout the process, and add a bucket lid to seal it, and operate in a yellow-light environment.

[0093] 3. Prepare the wrapping paper using the following preparation method:

[0094] In a yellow-light working environment, coat the surface of the base paper substrate with the above-mentioned silicone coating liquid using a 250-mesh ceramic gravure roll, and control the coating amount to 0.8 ± 0.3 g; irradiate with UV, the radiation energy is 50 - 90 mW / cm 2 , the machine speed is 20 - 50 m / min, coat side A; after winding, perform the same process and formula to coat side B (the other side opposite to side A), and finally let the rolled material hang in the air at room temperature for about 5 days.

[0095] Example 2

[0096] 1. Prepare the components of the silicone composition:

[0097] Vinyl silicone rubber: Methyl vinyl silicone rubber 110 - 2, 8 parts by weight;

[0098] Vinyl silicone oil: RH-Vi311, 25 parts by weight, viscosity is 300 - 800 mpa.s;

[0099] Vinyl MQ resin: DY-VMQ101 (the ratio of M:Q is 0.5), 5 parts by weight;

[0100] High-hydrogen-content silicone oil: DC7028, 5 parts by weight;

[0101] High-temperature resistant inorganic fiber: High-temperature type aluminum silicate fiber, 1 part by weight; the length is within 8 μm, and the diameter is nanoscale;

[0102] Gas-phase inorganic filler: Gas-phase aluminum trioxide ALUNA-100, 1 part by weight; Hydrophobic gas-phase silica (fumed silica) HB-139, 0.5 part by weight; Titanium dioxide: VK-T25SG, 13 parts by weight;

[0103] Photoinitiator: IRGACURE 184, 0.05 parts by weight;

[0104] Platinum catalyst: MeCpPtMe3, 0.5 parts by weight.

[0105] 2. Prepare the silicone coating solution, the same as in Example 1;

[0106] 3. Prepare the packaging paper, the same as in Example 1.

[0107] Example 3

[0108] 1. Prepare the components of the silicone composition:

[0109] Vinyl silicone rubber: Methyl vinyl silicone rubber 110-2, 25 parts by weight;

[0110] Vinyl silicone oil: RH-Vi311, 8 parts by weight, viscosity 300-800 mPa·s;

[0111] Vinyl MQ resin: DY-VMQ101 (M:Q ratio is 1.2), 30 parts by weight;

[0112] High hydrogen content silicone oil: DC7028, 1 part by weight;

[0113] High temperature resistant inorganic fiber: High temperature type aluminum silicate fiber, 15 parts by weight; length within 10 μm, diameter at the nanometer level;

[0114] Gas phase inorganic filler: Gas phase aluminum oxide ALUNA-100, 8 parts by weight; Hydrophobic gas phase silica (fumed silica) HB-139, 5 parts by weight; Titanium dioxide: VK-T25SG, 3 parts by weight;

[0115] Photoinitiator: IRGACURE 184, 1.5 parts by weight;

[0116] Platinum catalyst: MeCpPtMe3, 5 parts by weight.

[0117] 2. Prepare the silicone coating solution, the same as in Example 1;

[0118] 3. Prepare the packaging paper, the same as in Example 1.

[0119] Example 4

[0120] 1. Prepare the components of the silicone composition:

[0121] Vinyl silicone rubber: Methyl vinyl silicone rubber 110-2, 10 parts by weight;

[0122] Vinyl silicone oil: RH-Vi311, 20 parts by weight, viscosity 300-800 mPa·s;

[0123] Vinyl MQ resin: DY-VMQ101 (the ratio of M:Q is 0.71), 7 parts by weight;

[0124] High hydrogen content silicone oil: DC7028, 2 parts by weight;

[0125] High temperature resistant inorganic fiber: high temperature type aluminum silicate fiber, 3 parts by weight; within 10 μm in length and nanometer-sized in diameter;

[0126] Gas-phase inorganic filler: gas-phase aluminum trioxide ALUNA-100, 8 parts by weight; hydrophobic gas-phase silica (fumed silica) HB-139, 5 parts by weight; titanium dioxide: VK-T25SG, 3 parts by weight;

[0127] Photoinitiator: IRGACURE 184, 0.1 part by weight;

[0128] Platinum catalyst: MeCpPtMe3, 1 part by weight.

[0129] 2. Prepare the silicone coating solution, the same as in Example 1;

[0130] 3. Prepare the packaging paper, the same as in Example 1.

[0131] Example 5

[0132] 1. Prepare the components of the silicone composition:

[0133] Vinyl silicone rubber: methyl vinyl silicone rubber 110-2, 20 parts by weight;

[0134] Vinyl silicone oil: RH-Vi311, 10 parts by weight, with a viscosity of 300-800 mPa·s;

[0135] Vinyl MQ resin: DY-VMQ101 (the ratio of M:Q is 0.71), 21 parts by weight;

[0136] High hydrogen content silicone oil: DC7028, 3 parts by weight;

[0137] High temperature resistant inorganic fiber: high temperature type aluminum silicate fiber, 11 parts by weight; within 10 μm in length and nanometer-sized in diameter;

[0138] Gas-phase inorganic filler: gas-phase aluminum trioxide ALUNA-100, 8 parts by weight; hydrophobic gas-phase silica (fumed silica) HB-139, 5 parts by weight; titanium dioxide: VK-T25SG, 3 parts by weight;

[0139] Photoinitiator: IRGACURE 184, 1.2 parts by weight;

[0140] Platinum catalyst: MeCpPtMe3, 2.5 parts by weight.

[0141] 2. Prepare the silicone coating solution, the same as in Example 1;

[0142] 3. Prepare the wrapping paper, the same as in Example 1.

[0143] Example 6 group

[0144] This group of examples is used to illustrate the influence of the change of each component of the gas-phase inorganic filler on the performance of the wrapping paper.

[0145] Example 6a: Refer to Example 1. The difference from Example 1 is that the gas-phase inorganic filler does not contain titanium dioxide: VK-T25SG, and other components are the same as in Example 1;

[0146] Example 6b: Refer to Example 1. The difference from Example 1 is that the gas-phase inorganic filler does not contain gas-phase aluminum oxide ALUNA-100 and hydrophobic gas-phase silicon dioxide (silica) HB-139, and other components are the same as in Example 1;

[0147] Example 6c: Refer to Example 1. The difference from Example 1 is that the gas-phase inorganic filler does not contain hydrophobic gas-phase silicon dioxide (silica) HB-139, and other components are the same as in Example 1.

[0148] Example 7 group

[0149] This group of examples is used to illustrate the influence of the change of the content of high-temperature resistant inorganic fibers and gas-phase inorganic fillers on the performance of the wrapping paper.

[0150] Example 7a: Refer to Example 1. The difference from Example 1 is that there is 0.5 part by weight of high-temperature type aluminum silicate fiber; 0.4 part by weight of gas-phase aluminum oxide ALUNA-100; 0.27 part by weight of hydrophobic gas-phase silicon dioxide (silica) HB-139; 2 parts by weight of titanium dioxide: VK-T25SG;

[0151] Example 7b: Refer to Example 1. The difference from Example 1 is that there is 16 parts by weight of high-temperature type aluminum silicate fiber; 9 parts by weight of gas-phase aluminum oxide ALUNA-100; 6 parts by weight of hydrophobic gas-phase silicon dioxide (silica) HB-139; 16 parts by weight of titanium dioxide: VK-T25SG.

[0152] Example 8 group

[0153] This group of examples is used to illustrate the influence of the change of the mass ratio of gas-phase aluminum oxide to gas-phase silicon dioxide on the performance of the wrapping paper.

[0154] Example 8a: Conducted with reference to Example 1. The difference from Example 1 is that 4.2 parts by weight of fumed aluminum oxide ALUNA-100 and 1.2 parts by weight of hydrophobic fumed silica (silica white) HB-139 are used. At this time, the mass ratio of fumed aluminum oxide to hydrophobic fumed silica is 3.5;

[0155] Example 8b: Conducted with reference to Example 1. The difference from Example 1 is that 0.9 parts by weight of fumed aluminum oxide ALUNA-100 and 4.5 parts by weight of hydrophobic fumed silica (silica white) HB-139 are used. At this time, the mass ratio of fumed aluminum oxide to hydrophobic fumed silica is 0.2;

[0156] Example 8c: Conducted with reference to Example 1. The difference from Example 1 is that 2.7 parts by weight of fumed aluminum oxide ALUNA-100 and 2.7 parts by weight of hydrophobic fumed silica (silica white) HB-139 are used. At this time, the mass ratio of fumed aluminum oxide to hydrophobic fumed silica is 1;

[0157] Example 8d: Conducted with reference to Example 1. The difference from Example 1 is that 3.6 parts by weight of fumed aluminum oxide ALUNA-100 and 1.8 parts by weight of hydrophobic fumed silica (silica white) HB-139 are used. At this time, the mass ratio of fumed aluminum oxide to hydrophobic fumed silica is 2.

[0158] Comparative Example 1

[0159] Conducted with reference to Example 1. The difference from Example 1 is that it does not contain high-temperature type aluminosilicate fiber.

[0160] Comparative Example 2

[0161] Conducted with reference to Example 1. The difference from Example 1 is that it does not contain high-temperature type aluminosilicate fiber, fumed aluminum oxide ALUNA-100, and hydrophobic fumed silica (silica white).

[0162] [[ID=Q24]]Comparative Example 3

[0163] Conducted with reference to Example 1. The difference from Example 1 is that it does not contain high-temperature resistant inorganic fiber and gaseous inorganic filler.

[0164] Comparative Example 4

[0165] Conducted with reference to Example 1. The difference from Example 1 is that it does not contain gaseous inorganic filler.

[0166] Test Example

[0167] The wrapping papers prepared in the above-mentioned examples and comparative examples were used as sample groups for the following performance tests, and the original blank paper, sappi 80G white kraft paper, and sappi 115G white kraft paper were used as control groups.

[0168] (1) The water absorption performance of the papers in each sample group and control group at normal temperature and high humidity was tested using the following method: A4-sized specimens were placed at 23°C / 90% RH for 24 hours, then taken out and placed horizontally on a table at normal temperature, and the surface flatness was observed to record the number of obvious concavities and convexities on the surface. The results are recorded in Table 1.

[0169] (2) The thermal conductivity of the papers in each sample group and control group was tested. At 50°C, the thermal conductivity (W / m*K) of the samples was tested using a thermal conductivity tester according to ASTM D5470-2017.

[0170] (3) The opacity of the papers in each sample group and control group was measured according to the ISO 2471-2008 standard. The results are recorded in Table 1.

[0171] (4) The warpage of the papers in each sample group and control group after high temperature was tested using the following method: A4-sized specimens were left standing at 150°C for 3 minutes, then taken out and placed horizontally on a table at normal temperature. After 30 minutes, the distance between the highest and lowest points on the paper surface was measured. The results are recorded in Table 1. The high-temperature stability of the product can be judged based on the change in warpage after high temperature.

[0172] (5) The papers in each sample group and control group were observed after being coated with silicone coating solution. After baking at 150°C for 3 minutes, A4-sized specimens were taken out, and the glue penetration points on the surface were observed from the non-coated side. The results are recorded in Table 1.

[0173] (6) The tear resistance MD (longitudinal tear) and tear resistance CD (transverse tear) of the papers in each sample group and control group were measured according to the ISO 1974-2012 standard. The results are recorded in Table 1.

[0174] (7) The surface roughness of the papers in each sample group and control group was measured according to the ISO 8791-4-2021 standard. The results are recorded in Table 1.

[0175] (8) Coating adhesion fastness test: The coating adhesion fastness test was carried out using the cross-cut method in accordance with GB / T 9286-2021.

[0176] (9) The color differences of the paper in each sample group and the control group before and after high temperature are tested according to the ISO5361 standard: L, A, and B. L, A, and B represent the chromaticity values of the object color, that is, the color space coordinates of the color. Any color has a unique coordinate value. Among them, the L value ranges from 0 to 100, representing black and white. The closer the L value is to 0, the closer the sample is to black. If the L value is closer to 100, it means the sample is closer to white. The A value ranges from -100 to 100, representing red and green. If the A value is closer to -100, it means the sample is closer to green. If the A value is closer to 100, it means the sample is closer to red. The B value ranges from -100 to 100, representing yellow and blue. If the B value is closer to -100, it means the sample is closer to blue. If the B value is closer to 100, it means the sample is closer to yellow. The total color difference (Eab) can be used to determine whether the color difference of the product is qualified. The following method is used for testing: A4-sized samples are left standing at 150 °C for 3 minutes, then taken out and placed horizontally on the table at room temperature. After 30 minutes, the color difference on the paper surface is measured, and the results are recorded in Table 2.

[0177] Table 1

[0178]

[0179]

[0180] As can be seen from Table 1 and the test data of Examples 1-5, the opacity of the packaging paper provided by the present invention is above 90%. After being placed at room temperature and high humidity for 24 hours, its surface is smooth without unevenness, and it has good moisture resistance; after high temperature, the warping height is relatively low, and it has good high temperature resistance; after high temperature baking, the glue on the surface does not penetrate, and it has good high temperature moisture resistance; its thermal conductivity is 0.12 W / m*K or less, which is lower than that of the original blank paper (0.16 W / m*K), and it has good heat resistance; its tear resistance is improved compared with the original blank paper, the surface roughness is relatively low, and the coating adhesion and flexibility tests of the packaging paper provided by the present invention are qualified, indicating that the silicone coating liquid is evenly distributed and suitable for coating.

[0181] From Example 6 group, it can be seen that when there is no titanium dioxide, the opacity of the product decreases; when gas-phase aluminum trioxide and gas-phase silicon dioxide are not included, the number of surface irregularities of the product in the room temperature and high humidity test increases significantly, and the warping height after high temperature increases, indicating that the moisture resistance of the product decreases; when gas-phase silicon dioxide is not contained, the number of surface irregularities of the product in the room temperature and high humidity test increases significantly, and the warping height after high temperature increases somewhat, indicating that gas-phase silicon dioxide has a greater impact on the moisture resistance of the product.

[0182] As can be seen from the 7 groups of examples, when the mass ranges of the high-temperature type aluminosilicate fiber and the gaseous inorganic filler are lower than the ranges defined in the present invention, the number of surface irregularities significantly increases during the normal temperature and high humidity test, the warping height increases after high temperature, the moisture resistance performance decreases, the thermal conductivity coefficient approaches the value of the original blank paper, and its thermal resistance performance decreases; while when the mass ranges of the high-temperature type aluminosilicate fiber and the gaseous inorganic filler are higher than the ranges defined in the present invention, although the moisture resistance performance of the product meets the usage requirements, the thermal conductivity coefficient is relatively high, the thermal resistance performance is poor, and due to the relatively large amount of inorganic substances added, the surface of the product will be relatively rough and there will be a phenomenon of coating peeling, which affects the actual use of the product.

[0183] As can be seen from the 8 groups of examples, when the ratio of gaseous aluminum trioxide to gaseous silicon dioxide is higher than the range defined in the present invention, the moisture resistance of the product decreases and there is a phenomenon of coating cracking; when the ratio of gaseous aluminum trioxide to gaseous silicon dioxide is lower than the range defined in the present invention, although the moisture resistance is qualified, due to the excessive content of gaseous silicon dioxide, there will be a phenomenon of coating peeling. While when the ratio of gaseous aluminum trioxide to gaseous silicon dioxide is within the range defined in the present invention, all the properties of the product are better.

[0184] As can be seen from the comparative examples, the high-temperature type aluminosilicate fiber and the gaseous inorganic filler have a direct impact on the moisture resistance and high-temperature resistance of the product. The packaging paper provided by the examples of the present invention has a low warping degree after high temperature, is not prone to water loss and curling, is not prone to liquid penetration, has good tear resistance, and low roughness.

[0185] Table 2

[0186]

[0187]

[0188] As can be seen from Table 2, the color difference of the packaging paper provided by the examples of the present invention changes little before and after high-temperature treatment. Among them, the L values measured in Examples 1-5 are all 90 or above, which is much higher than the measured value of 66 of the original blank paper, indicating that the packaging paper prepared by the present invention is close to white, and the change in its a value is small, while the b value decreases more than the measured value (35) of the original blank paper, indicating that the original blank paper turns yellow after high-temperature treatment, while the yellowing phenomenon of the packaging paper prepared by the present invention is significantly reduced after high-temperature treatment.

[0189] As can be seen from Example 6a and Example 7a, when titanium dioxide is not contained or the content of titanium dioxide is relatively low, the measured b value of the product tends to be yellow, indicating that the addition of titanium dioxide has a good inhibitory effect on the yellowing of the product after high temperature.

[0190] As can be seen from the comparative examples, when the high-temperature type aluminosilicate fiber and / or inorganic filler is not contained, the L value of the product significantly decreases and the b value significantly increases, indicating that the product turns yellow after high-temperature baking and the high-temperature resistance performance significantly decreases.

[0191] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An organosilicon coating liquid for base paper, characterized in that, The organosilicon coating liquid includes an organosilicon composition, which includes the following raw material components in parts by weight: 8-25 parts of vinyl silicone rubber, 8-25 parts of vinyl silicone oil, 5-30 parts of vinyl MQ resin, 1-5 parts of high hydrogen silicone oil, 1-15 parts of high temperature resistant inorganic fiber, 8-21 parts of gas phase inorganic filler, 0.05-1.5 parts of photoinitiator, and 0.5-5 parts of catalyst; The gas-phase inorganic filler includes gas-phase aluminum oxide, gas-phase silicon dioxide, and gas-phase titanium dioxide; the mass ratio of the gas-phase aluminum oxide to the gas-phase silicon dioxide is (0.5-3):1; The high temperature resistant inorganic fiber is selected from one or both of aluminum silicate fiber and magnesium silicate fiber; The gas-phase inorganic filler comprises, by weight, 1-8 parts of gas-phase aluminum oxide, 0.5-5 parts of gas-phase silicon dioxide, and 3-13 parts of gas-phase titanium dioxide.

2. The coating liquid according to claim 1, wherein, The organosilicon composition comprises the following raw material components in parts by weight: 10-20 parts of vinyl silicone rubber, 10-20 parts of vinyl silicone oil, 7-21 parts of vinyl MQ resin, 2-3 parts of high-hydrogen silicone oil, 3-11 parts of high-temperature resistant inorganic fiber, 8-21 parts of gas-phase inorganic filler, 0.1-1.2 parts of photoinitiator, and 1-2.5 parts of catalyst.

3. The coating liquid according to claim 1, wherein The mass ratio of the fumed aluminum oxide to the fumed silicon dioxide is (1-2):

1.

4. The coating liquid according to claim 1 or 2, wherein The molecular weight of the vinyl silicone rubber is 200 kDa-1000 kDa; The viscosity of the vinyl silicone oil is 200-900 mPa.s; The ratio of M:Q in the vinyl MQ resin is (0.5-1.2):1; The hydrogen content of the high hydrogen silicone oil is 1.4-1.6%.

5. The coating liquid according to claim 1, wherein The high-temperature resistant inorganic fiber has a length of 0.5 μm-10 μm and a diameter of 1 nm-1000 nm.

6. The coating liquid according to claim 1, wherein, The photoinitiator is a free radical photoinitiator; The catalyst is a platinum catalyst.

7. A method for preparing the silicone coating liquid according to any one of claims 1-6, characterized in that, The steps include: (1) According to the formula ratio of the organic silicone coating liquid, vinyl silicone rubber is weighed and added to a first mixing and stirring device, and high-temperature resistant inorganic fiber and gas-phase inorganic filler are weighed and added to the first mixing and stirring device in several batches, mixed and stirred to obtain material S1; (2) According to the formula ratio of the organosilicon coating liquid, vinyl MQ resin, high hydrogen silicone oil and vinyl silicone oil are weighed and added into a second mixing and stirring device, and mixed and stirred until the vinyl MQ resin is dissolved; then material S1 is added into the second mixing and stirring device, and mixed and stirred to obtain material S2; (3) Add material S2 to the batching container, add the formulated amount of photoinitiator and mix and stir, then weigh the formulated amount of catalyst and add it to the batching container and mix and stir.

8. An article, characterized in that, The present invention comprises a substrate and a functional coating applied on both sides of the substrate, wherein the functional coating is prepared by the organic silicon coating liquid according to any one of claims 1 to 6, or is prepared by the organic silicon coating liquid prepared by the method according to claim 7.

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