Ultraviolet curing organic silicon composition as well as preparation method and application thereof

Abstract

The invention provides an ultraviolet curing organic silicon composition which is prepared from the following components in parts by weight: 95.0%-99.99% of an organic silicon polymer, 0.01%-5.0% of a photo-crosslinking agent and 0-1.0% of an auxiliary material, and the sum of the weight ratios of the components is 100%. Experiments are carried out on organic silicon polymers and photoinitiators with different structures, and it is found that only when the organic silicon polymers and the photoinitiators with the structures are mixed, the organic silicon polymers and the photoinitiators can be cured by ultraviolet light. The prepared cured silicon coating meets the use requirements of silicon release products. And the cured coating is colorless and odorless, and meets the requirements of healthy and environment-friendly products. After a small amount of UV curing cross-linking agent is added into the UV curing organic silicon composition, the irradiation dose required by complete curing can be reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer materials, and in particular relates to an ultraviolet light-cured organic silicon composition and a preparation method and application thereof. Background Art

[0002] Thermally curable silicone compositions have been used to prepare release substrates for adhesives. Such silicone compositions generally contain vinyl polysiloxanes, silanized polysiloxanes, and catalysts that promote the reaction of silicon hydrides with vinyl groups. US4609574 discloses a curable silicone coating composition comprising (A) polydimethylsiloxane, wherein 90-99.5% of all organic groups are methyl groups, and 0.5-10% of all organic groups are selected from vinyl and higher alkenyl groups, (B) an effective amount of a platinum catalyst, (C) a silanized polysiloxane crosslinker compatible with (A), each crosslinker having an average of at least three silicon hydride groups; and (D) an inhibitor for the metal silanization catalyst.

[0003] It is well known that heat-curable silicone compositions are used to prepare adhesives. Such silicone adhesives have many excellent properties, such as high thermal stability; high oxidative stability; permeability to a variety of gases; low surface energy; low refractive index; low hydrophilicity; dielectric properties; biocompatibility; and excellent adhesive properties. US 5461134, US 5512650, US 5475124, US 5792554, US 6355759, and US 6458454 disclose many formulations and preparation methods of such pressure-sensitive adhesives. Such silicone adhesive compositions generally use a platinum catalytic system or a peroxide heat curing system.

[0004] The above-mentioned heat-curing silicone composition has some obvious technical and cost disadvantages, such as: (1) once the cross-linking agent and platinum catalyst are added, the heat-curing silicone composition formula begins to undergo a cross-linking reaction, resulting in a continuous increase in the viscosity of the formula. The service life of the formula is very short and must be used up within a few hours; (2) the cross-linking reaction is relatively slow and is greatly affected by temperature, impurities and humidity. Incomplete cross-linking often occurs, causing many difficulties in product quality control; (3) as we all know, platinum catalysts are very expensive. Although the amount used is only a few ten-thousandths, its cost accounts for more than half of the total material cost; (4) the formula is a two-component system and needs to be mixed before coating, which is not conducive to continuous, stable, large-scale modern production lines; (5) the efficiency of peroxide thermal cross-linking is low, and the required thermal cross-linking temperature is as high as 180 degrees, which can easily cause thermal deformation of the coated substrate. In addition, after decomposition, the peroxide remains in the adhesive, which has an adverse effect on the product.

[0005] Although the above-mentioned heat-curing silicone composition has been industrialized for many years, there is still a need to invent a new silicone composition to improve the above-mentioned shortcomings. Recently, US 9,663,690 discloses a UV-curing silicone composition, the main components of which include silicone polymer, halomethyl-1,3,5-triazine, and tackifying resin. The composition can be used to prepare pressure-sensitive adhesives and release coatings. However, the compatibility of halomethyl-1,3,5-triazine with silicone polymer is relatively poor, resulting in poor transparency of the coated sample, and after UV curing, the product of the photoreaction of halomethyl-1,3,5-triazine shows dark yellow and strong odor, which seriously limits the application range and performance of the product. In addition, the production process of halomethyl-1,3,5-triazine is complicated, and its price is much higher than that of general UV photoinitiators. Summary of the invention

[0006] In order to solve the problems existing in the prior art, the present invention provides a UV-curable silicone composition, which is not only simple in process, energy-efficient and efficient, and stable in quality, but also has lower total production and material costs than existing thermal-curable silicone compositions, and can be used to prepare silicon release coatings and other functional silicon coating products. Accordingly, the present invention also provides a preparation method and application thereof.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] The first object of the present invention is to provide a UV-curable silicone composition, which is composed of the following components in parts by weight: 95.0%-99.99% of silicone polymer, 0.01%-5.0% of photocrosslinking agent, 0-1.0% of auxiliary materials, and the sum of the weight ratios of the above components is 100%;

[0009] The structural formula of the organosilicon polymer is as follows:

[0010]

[0011] in,

[0012] R 3 are each independently alkyl, aryl or alkoxy;

[0013] R 4 is an amine group or a hydroxyl group;

[0014] R 5 is an amine group or a hydroxyl group;

[0015] R 6 Each is independently H, alkyl, aryl, alkoxy, epoxy, amine, hydroxyl or -(R 3 )2R 5 ;

[0016] x is at least 200; y is between 0 and 80;

[0017] The photocrosslinking agent is a halogenated benzophenone derivative compound;

[0018] As a preference, when R 3 When it is an alkyl group, the number of carbon atoms ranges from 2 to 12; and / or

[0019] When R 6 When it is an alkyl group, the number of carbon atoms ranges from 2 to 12.

[0020] Preferably, the organosilicon polymer is hydroxyl-terminated poly(dimethylsiloxane), amine-terminated poly(dimethylsiloxane) or a mixture of the two;

[0021] Preferably, the viscosity of the hydroxy-terminated poly(dimethylsiloxane) ranges from 1000 cps to 10,00,000 cps.

[0022] Preferably, the photocrosslinking agent is an alkoxy-containing halogenated benzophenone derivative compound; preferably, the photocrosslinking agent is a photoinitiator PI-A.

[0023] Preferably, the auxiliary materials include one or more of additives, MQ tackifying resins, and functional fillers;

[0024] Preferably, the additive includes one or more of an adhesion promoter, a UV curing crosslinking agent, a pigment, a filler, an antioxidant or a UV stabilizer;

[0025] The MQ tackifying resin includes at least one of methyl MQ silicone resin or vinyl MQ silicone resin;

[0026] The functional filler includes an electrically conductive filler, a thermally conductive filler, or a mixture thereof.

[0027] Preferably, the UV-curable silicone composition is composed of the following components in parts by weight: 95.0%-99.99% silicone polymer, 0.01%-5.0% photocrosslinking agent, and the sum of the weight ratios of the above two components is 100%; or

[0028] The ultraviolet light-curable organic silicon composition is composed of the following components in parts by weight: 97.0%-98.5% of organic silicon polymer, 0.5%-2.0% of photocrosslinking agent, and 1.0% of auxiliary material, and the sum of the weight ratios of the above components is 100%.

[0029] The second object of the present invention is to provide a method for preparing the above-mentioned UV-curable silicone composition, wherein a solvent is mixed with a silicone polymer, and then mixed with a photoinitiator, or with a photoinitiator and auxiliary materials to obtain a UV-curable silicone composition;

[0030] Preferably, the weight ratio of the solvent to the silicone polymer is in the range of 1:9-9:1.

[0031] The third object of the present invention is to provide the use of the above-mentioned UV-curable silicone composition as an adhesive.

[0032] The fourth object of the present invention is to provide the use of the above-mentioned UV-curable silicone composition in the preparation of silicone release coatings.

[0033] A fifth object of the present invention is to provide a method for preparing a silicon release coating, comprising coating the above-mentioned UV-curable silicone composition on a substrate surface, drying the solvent, and curing the composition using UV light in air or nitrogen to prepare a silicon release coating;

[0034] Preferably, the curing dose is 60-100 mJ / cm 2 ;

[0035] Preferably, the substrate comprises a polyester film.

[0036] A sixth object of the present invention is to provide a silicon release film, including a silicon release coating prepared by the above method.

[0037] The present invention has conducted experiments on silicone polymers and photoinitiators with different structures, and found that only when the silicone polymer with the structure described in the present invention and the photoinitiator are mixed, can they be cured by ultraviolet light. The prepared cured silicon coating meets the use requirements of silicon release products. Moreover, the cured coating is colorless and odorless, meeting the requirements of healthy and environmentally friendly products. After adding a small amount of UV curing crosslinking agent to the ultraviolet light (UV) curing silicone composition, the radiation dose required for complete curing can be reduced.

[0038] The inventors of the present application believe that the principle of the present invention may be: in the present invention, the photocrosslinking agent can react with the hydroxyl or amine group contained in the silicone rubber through its alkoxy group to form a crosslink, and on the other hand, its halogenated dibenzophenone can capture the methyl hydrogen of the silicone rubber under UV light to generate two free radicals (halogenated dibenzophenone free radical and methyl free radical of silicone rubber), and then the two free radicals quickly couple to form a chemical crosslink. DETAILED DESCRIPTION

[0039] The following examples are provided to facilitate a better understanding of the present invention, but are not intended to limit the present invention. The experimental methods in the following examples are conventional methods unless otherwise specified. The experimental materials used in the following examples are purchased from conventional biochemical reagent companies unless otherwise specified.

[0040] The ultraviolet (UV) curing organic silicon composition of the present invention is composed of the following components in parts by weight: 95.0%-99.99% of organic silicon polymer, 0.01%-5.0% of photocrosslinking agent, 0-1.0% of auxiliary materials, and the sum of the weight ratios of the above components is 100%.

[0041] In some embodiments of the present invention, the structural formula of the organosilicon polymer is as follows:

[0042]

[0043] in,

[0044] R 3 are each independently alkyl, aryl or alkoxy;

[0045] R 4 is an amine group or a hydroxyl group;

[0046] R 5 is an amine group or a hydroxyl group;

[0047] R 6 Each is independently H, alkyl, aryl, alkoxy, epoxy, amine, hydroxyl or -(R 3 )2R 5 ;

[0048] x is at least 200; y is 0 to 80.

[0049] In some embodiments of the present invention, when R 3 When it is an alkyl group, the number of carbon atoms ranges from 2 to 12.

[0050] In some embodiments of the present invention, when R 6 When it is an alkyl group, the number of carbon atoms ranges from 2 to 12.

[0051] In some embodiments of the present invention, the organosilicon polymer is hydroxyl-terminated poly(dimethylsiloxane), amine-terminated poly(dimethylsiloxane), or a mixture of the two.

[0052] In some preferred embodiments, the viscosity of the hydroxy-terminated poly(dimethylsiloxane) ranges from 1000 cps to 10,00,000 cps.

[0053] The commercial silicone polymer used in the present invention, the high molecular weight silicone rubber solution product PDMS-SS4191A (30% solid content hydroxyl-terminated poly(dimethylsiloxane)) can be purchased from Momentive. 100% solid content hydroxyl-terminated poly(dimethylsiloxane) (commonly known as 107 glue on the market) can be obtained from many domestic manufacturers, and its optional viscosity ranges from 1000cps to 10,00,000cps.

[0054] The photocrosslinking agent is a halogenated benzophenone derivative compound.

[0055] In some embodiments of the present invention, the photocrosslinking agent is a halogenated benzophenone derivative compound containing an alkoxy group.

[0056] In a preferred embodiment of the present invention, the photocrosslinking agent is a photoinitiator PI-A.

[0057] The structural formula of PI-A is as follows:

[0058]

[0059] The photoinitiator (PI-A) used in the present invention was purchased from Shenzhen Lihebohui Photosensitive Materials Co., Ltd.

[0060] In some embodiments of the present invention, the auxiliary materials include one or more of additives, MQ tackifying resins, and functional fillers.

[0061] In some preferred embodiments, the additive includes one or more of an adhesion promoter, a UV curing crosslinking agent, a pigment, a filler, an antioxidant or a UV stabilizer.

[0062] In some preferred embodiments, the MQ tackifying resin includes at least one of methyl MQ silicone resin or vinyl MQ silicone resin. The MQ tackifying resin is used to further improve its bonding performance.

[0063] In some preferred embodiments, the functional filler includes an electrically conductive filler, a thermally conductive filler, or a mixture thereof. The functional filler is used to further improve its electrical conductivity and / or thermal conductivity.

[0064] In some preferred embodiments, the auxiliary material includes one of A-174, SR-351, TAIC or D-100.

[0065] In some embodiments of the present invention, the ultraviolet (UV) curable silicone composition is composed of the following components in parts by weight: 95.0%-99.99% of silicone polymer, 0.01%-5.0% of photocrosslinker, and the sum of the weight ratios of the above two components is 100%.

[0066] In some preferred embodiments, the ultraviolet (UV) curable silicone composition is composed of the following components in parts by weight: 97.0%-99.5% of silicone polymer, 0.5%-3.0% of photocrosslinking agent, and the sum of the weight ratios of the above two components is 100%.

[0067] In some preferred embodiments, the ultraviolet (UV) curable silicone composition is composed of the following components in parts by weight: 98.0%-98.5% of silicone polymer, 1.5%-2.0% of photocrosslinking agent, and the sum of the weight ratios of the above two components is 100%.

[0068] In some embodiments of the present invention, the ultraviolet (UV) curable silicone composition is composed of the following components in parts by weight: 97.0%-98.5% of silicone polymer, 0.5%-2.0% of photocrosslinker, 1.0% of auxiliary materials, and the sum of the weight ratios of the above components is 100%.

[0069] When auxiliary materials are added to ultraviolet (UV) curable silicone compositions, the UV radiation dose required for complete curing can be reduced.

[0070] In some preferred embodiments, the ultraviolet (UV) curable silicone composition is composed of the following components in parts by weight: 97.0% silicone polymer, 2.0% photocrosslinking agent, 1.0% auxiliary material, and the sum of the weight ratios of the above components is 100%.

[0071] The preparation method of the ultraviolet (UV) curable silicone composition of the present invention is:

[0072] The solvent is mixed with the organic silicon polymer, and then evenly mixed with the photoinitiator, or the photoinitiator and auxiliary materials to obtain an ultraviolet (UV) curing organic silicon composition.

[0073] The step-by-step mixing method makes quality control easier.

[0074] The weight ratio of the solvent to the silicone polymer is in the range of 1:9-9:1.

[0075] The UV curable silicone composition of the present invention is a hot melt adhesive or liquid adhesive that does not contain an organic solvent. According to the mixing and coating requirements of the silicone composition, a solvent may also be added to reduce its viscosity. Common solvents include toluene, xylene, ethyl acetate, etc.

[0076] If the molecular weight of the silicone polymer used is low, there is no need to use solvents to reduce viscosity. The role of the solvent is to help reduce the viscosity of the formula to facilitate mixing and coating processes, but it does not participate in the reaction and does not exist in the final product.

[0077] The ultraviolet (UV) curable silicone composition of the present invention can be used as an adhesive to prepare silicone release coatings and other functional silicone coating products by any conventional coating method.

[0078] The method for preparing a silicon release coating using the ultraviolet (UV) curable silicone composition of the present invention is as follows:

[0079] The UV-curable silicone composition is coated on the surface of the substrate, the solvent is dried, and the UV-curable silicone composition is cured in air or nitrogen with a curing dose of 60-100 mJ / cm 2 , a silicon release coating is prepared.

[0080] It is known to those skilled in the art that curing is easier in nitrogen than in air.

[0081] In some embodiments of the present invention, the substrate comprises polyester film, PP, PE, PVC, or paper.

[0082] In some preferred embodiments, the thickness of the substrate is 10-200 μm.

[0083] In some preferred embodiments, the coating thickness of the ultraviolet (UV) curable silicone composition is 1-20 μm.

[0084] The UV-curable silicone composition of the present invention can be effectively cross-linked in the air under UV irradiation. The prepared cured silicone coating meets the use requirements of silicone release products. Moreover, the cured coating is colorless and odorless, meeting the requirements of healthy and environmentally friendly products.

[0085] The present invention has no limitation on the source of ultraviolet light, as long as it can provide ultraviolet light, such as carbon arc, mercury vapor arc, fluorescent lamp with special ultraviolet light-emitting phosphor, electronic flash, laser with specific wavelength, ultraviolet light-emitting diode or a combination thereof.

[0086] The silicon release coating prepared above can be used to prepare a silicon release film according to conventional methods in the art.

[0087] Example 1-4 Preparation of UV-curable silicone composition

[0088] The preparation method of the ultraviolet (UV) curable silicone composition of Examples 1-4 is as follows:

[0089] (1) 67 parts by weight of toluene were added to 33 parts by weight of PDMS-SS4191A (30% by weight solid content) to prepare four solution samples each having a solid content of 10% by weight;

[0090] (2) adding photoinitiator (PI-A) in the amount shown in Table 1 to the solution samples of step (1);

[0091] (3) The solution samples prepared in step (2) were placed in a drum mixer and mixed for 2 hours until all the photoinitiators (PI-A) were completely dissolved, thereby preparing the ultraviolet (UV) curable silicone compositions of Examples 1-4.

[0092] Method of using the ultraviolet (UV) curable silicone composition of Examples 1-4:

[0093] Four UV-curable silicone compositions were coated with a uniform coating of 5 μm thick on a 25 μm thick polyester film using a No. 8 wire rod, dried in an oven at 100°C for 10 minutes, cooled to room temperature, and then UV-cured in a desktop UV curing machine (medium pressure mercury column, H lamp, 120 W / cm2), with the UVC curing dose controlled at 100 mJ / cm2. 2 , four sample coatings were prepared: sample coatings of Examples 1-4.

[0094] Performance test of sample coatings of Examples 1-4:

[0095] 1. The release force of the coating of the samples of Examples 1-4 was tested according to the following method:

[0096] The peeling tester is an IMass SP2000 peeling tester, which tests the peeling force of TESA 7475 tape from the sample coating at a peeling speed of 300 mm / min and a peeling angle of 180°. Each peeling force value is the average result of three test samples. The peeling force test conditions are temperature 23°C ± 2°C, 50% RH ± 5% RH.

[0097] The test steps are:

[0098] (1) With the TESA7475 adhesive surface facing downward, apply the adhesive strip to the sample coating of Examples 1-4 with slight finger pressure, and use a pressure roller to press back and forth twice at a speed of approximately 10 mm / sec to ensure that the adhesive surface is in close contact with the sample coating.

[0099] (2) The first group of samples were aged in an oven at 70°C for one week, and the second group of samples were placed at 25°C and 50% relative humidity for one week.

[0100] (3) The final peeling force of the two groups of samples was tested using a peel tester. The test results are listed in Table 1.

[0101] 2. The re-adhesion peeling force is tested as follows:

[0102] The test steps are:

[0103] (1) Peel off the TESA 7475 tape from the coating of the example sample and apply the tape to the steel plate with slight finger pressure.

[0104] (2) Use a pressure roller to press back and forth twice at a speed of about 10 mm / s to ensure that the rubber surface is in close contact with the steel plate without any bubbles.

[0105] (3) After 30 minutes of lamination with the steel plate, the peeling force of the TESA 7475 tape was tested using a peel tester. The results are listed in Table 1.

[0106] 3. The gel weight fraction of the sample coatings of Examples 1-4 was tested according to the following method:

[0107] The gel weight fraction of the sample coating can measure the degree of cross-linking reaction of the silicone polymer. The coating of the ultraviolet (UV) curable silicone composition of Examples 1-4 on the polyester film was UV cured, immersed in methyl isobutyl ketone (MIBK) for 5 minutes, taken out and dried, and the weight loss of the coating was measured, and the gel weight fraction of the coating was determined according to the following equation:

[0108] (W / W0)x100.

[0109] Where W0 is the initial coating weight before extraction with MI BK, and W is the coating weight after extraction with MI BK. The results are listed in Table 1.

[0110] Table 1 Performance test results of the ultraviolet (UV) curable silicone composition of the present invention

[0111]

[0112]

[0113] As can be seen from Table 1, the UV-curable silicone composition of the present invention can be effectively cross-linked in the air under UV irradiation. The prepared cured silicone coating meets the use requirements of silicone release products. Moreover, the cured coating is colorless and odorless, meeting the requirements of healthy and environmentally friendly products.

[0114] Example 5-9 Preparation of UV Curable Silicone Composition

[0115] The preparation method of the ultraviolet (UV) curable silicone composition of Examples 5-9 is as follows:

[0116] (1) 90 parts by weight of toluene were added to 10 parts by weight of hydroxy-terminated poly(dimethylsiloxane) (107 glue, viscosity of about 4000,000 cps) to form a homogeneous silicon polymer solution, and five solution samples each having a solid content of 10% by weight were prepared;

[0117] (2) adding a photoinitiator (PI-A) or a photoinitiator and an additive in an amount shown in Table 2 to the solution samples of step (1);

[0118] (3) The solution samples prepared in step (2) were placed on a drum mixer and mixed for 2 hours until all the photoinitiator (PI-A) and / or additives were completely dissolved, thereby preparing the ultraviolet (UV) curable silicone compositions of Examples 5-9.

[0119] Among them, the additives include A-174 (γ-methacryloxypropyltrimethoxysilane, purchased from Moment ive) in Table 2, which is a silicone coupling agent type UV curing crosslinker; SR-351 (trimethylolpropane trimethacrylate, purchased from Sartomer) is an acrylic UV curing crosslinker; TAIC (triallyl isocyanurate, purchased from Hunan Fangruida) is a vinyl UV curing auxiliary crosslinker; D-100 (silicone oil containing methacrylic functional groups at both ends, purchased from Moment ive) is a silicone oil macromolecular UV curing crosslinker.

[0120] Method of using the ultraviolet (UV) curable silicone composition of Examples 5-9:

[0121] Five UV-curable silicone compositions were coated with a uniform coating of 5 μm thick on a 25 μm thick polyester film using a No. 8 wire rod, dried in an oven at 100°C for 10 minutes, cooled to room temperature, and then UV-cured in a desktop UV curing machine (medium pressure mercury column, H lamp, 120 W / cm2), with the UVC curing dose controlled at 60 mJ / cm2. 2 , five sample coatings were prepared: sample coatings of Examples 5-9.

[0122] The release force and crosslinking degree of the coating samples of Examples 5-9 were tested in the same manner as in Examples 1-4. The test results are listed in Table 2.

[0123] Table 2 Performance test results of the ultraviolet (UV) curable silicone composition of the present invention

[0124]

[0125] As can be seen from Table 2, the addition of one or more additives to the ultraviolet (UV) curable silicone composition of the present invention can further improve its performance. After adding a small amount of UV curable crosslinking agent, its UV curing efficiency can be improved and the radiation dose required for complete curing can be reduced.

[0126] Comparative Example 1

[0127] The difference between this comparative example and Example 2 is that the initiator used is the traditional photoinitiator Darocur 1173 (purchased from BASF, Germany). The other parameters and preparation methods are the same as those in Example 2.

[0128] Comparative Example 2

[0129] The difference between this comparative example and Example 2 is that the initiator used is the traditional photoinitiator Irgacure 184 (purchased from BASF, Germany). The other parameters and preparation methods are the same as those in Example 2.

[0130] Comparative Example 3

[0131] The difference between this comparative example and Example 2 is that the initiator used is the traditional photoinitiator Irgacure TPO (purchased from BASF, Germany). The other parameters and preparation methods are the same as those in Example 2.

[0132] The compositions obtained in Comparative Examples 1-3 were respectively prepared according to the method of Example 2 to obtain sample coatings of Comparative Examples 1-3. After ultraviolet irradiation (UVC curing dose was controlled at 120 mJ / cm 2 ), the film coatings of Comparative Examples 1-3 can all be gently wiped off with fingers, indicating that the coatings are basically not cured, so the cohesive force is very low.

[0133] However, the sample coating of Example 2 can form effective chemical crosslinking under the same UV light, and the coating on the film cannot be rubbed off with fingers.

[0134] Comparative Example 4

[0135] The difference between this comparative example and Example 2 is that the initiator used is a triazine photoinitiator (2,4-bis-trichloromethyl methoxy-6-(4-methoxy-pheny l)-5-triazine, purchased from Hubei Xingyan New Material Technology Co., Ltd.). The other parameters and preparation methods are the same as those in Example 2.

[0136] The obtained composition was used in accordance with the method of Example 2 to obtain a sample coating of Comparative Example 2. The coating can also form effective chemical crosslinks after ultraviolet irradiation, and the coating on the film is difficult to wipe off with fingers. However, after curing, the surface coating is dark yellow and has a noticeable odor, which does not meet the health and environmental protection requirements of release products, so it is difficult to have practical use value.

[0137] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A UV-curable silicone composition, characterized in that: The UV-curable silicone composition is composed of the following components in parts by weight: 95.0%-99.99% of silicone polymer, 0.01%-5.0% of photocrosslinking agent, 0-1.0% of auxiliary materials, and the sum of the weight ratios of the above components is 100%; The structural formula of the organosilicon polymer is as follows: in, R 3 are each independently alkyl, aryl or alkoxy; R 4 is an amine group or a hydroxyl group; R 5 is an amine group or a hydroxyl group; R 6 Each is independently H, alkyl, aryl, alkoxy, epoxy, amine, hydroxyl or -(R 3 )2R 5 ; x is at least 200; y is between 0 and 80; The photocrosslinking agent is a halogenated benzophenone derivative compound; As a preference, when R 3 When it is an alkyl group, the number of carbon atoms ranges from 2 to 12 and / or When R 6 When it is an alkyl group, the number of carbon atoms ranges from 2 to 12.

2. The UV-curable silicone composition according to claim 1, characterized in that: The organosilicon polymer is hydroxyl-terminated poly(dimethylsiloxane), amine-terminated poly(dimethylsiloxane) or a mixture of the two; Preferably, the viscosity of the hydroxy-terminated poly(dimethylsiloxane) ranges from 1000 cps to 10,00,000 cps.

3. The UV-curable silicone composition according to claim 1, characterized in that: The photocrosslinking agent is a halogenated benzophenone derivative compound containing an alkoxy group; preferably, the photocrosslinking agent is a photoinitiator PI-A.

4. The UV-curable silicone composition according to claim 1, characterized in that: The auxiliary materials include one or more of additives, MQ tackifying resins, and functional fillers; Preferably, the additive includes one or more of an adhesion promoter, a UV curing crosslinking agent, a pigment, a filler, an antioxidant or a UV stabilizer; The MQ tackifying resin includes at least one of methyl MQ silicone resin or vinyl MQ silicone resin; The functional filler includes an electrically conductive filler, a thermally conductive filler, or a mixture thereof.

5. The UV-curable silicone composition according to any one of claims 1 to 4, characterized in that: The UV-curable silicone composition is composed of the following components in parts by weight: 95.0% to 99.99% of silicone polymer, 0.01% to 5.0% of photocrosslinking agent, and the sum of the weight ratios of the above two components is 100%; or The ultraviolet light-curable organic silicon composition is composed of the following components in parts by weight: 97.0%-98.5% of organic silicon polymer, 0.5%-2.0% of photocrosslinking agent, and 1.0% of auxiliary material, and the sum of the weight ratios of the above components is 100%.

6. The method for preparing the UV-curable silicone composition according to any one of claims 1 to 5, characterized in that: The solvent is mixed with the organosilicon polymer, and then mixed with the photoinitiator, or the photoinitiator and auxiliary materials to obtain a UV-curable organosilicon composition; Preferably, the weight ratio of the solvent to the silicone polymer is in the range of 1:9-9:

1.

7. Use of the UV-curable silicone composition according to any one of claims 1 to 5 as an adhesive.

8. Use of the UV-curable silicone composition according to any one of claims 1 to 5 in the preparation of a silicone release coating.

9. A method for preparing a silicon release coating, characterized in that: The ultraviolet light-curable silicone composition according to any one of claims 1 to 5 is applied on the surface of a substrate, the solvent is dried, and the composition is cured using ultraviolet light in air or nitrogen to prepare a silicone release coating; Preferably, the curing dose is 60-100 mJ / cm 2 ; Preferably, the substrate comprises a polyester film.

10. A silicon release film, comprising a silicon release coating prepared by the method of claim 9.

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