Light-cured organic silica gel as well as preparation method and application thereof

Abstract

The invention relates to light-cured organic silica gel as well as a preparation method and application thereof. The light-cured organic silica gel is prepared from the following raw materials in percentage by mass: 65 to 99 percent of vinyl silicone oil, 0 to 31 percent of terminated hydrogen-containing silicone oil, 0.1 to 3 percent of cross-linked hydrogen silicone oil, 0.5 to 1 percent of dialkoxy silane containing an epoxy group, 0.2 to 0.4 percent of dialkoxy silane containing an acryloyloxy group and 0.0005 to 0.005 percent of a UV (Ultraviolet) type platinum catalyst. The hydrogen content of the cross-linked hydrogen silicone oil is 8 to 16.6 mmol / g. The light-cured organic silica gel provided by the invention has the characteristics of good storage stability, high curing speed, good adhesion with a base material and difficulty in yellowing.

Description

Technical Field

[0001] The present invention relates to the technical field of organic silicone rubber, and in particular to a light-curing organic silicone rubber and a preparation method and application thereof. Background Art

[0002] Addition-type silicone rubber is cured through a hydrosilylation reaction under the action of a platinum catalyst. It has the characteristics of low volume shrinkage after curing and fast curing speed. It can be cured at room temperature or by heating. The higher the temperature, the faster the curing speed. It has been widely used in the industrial and electronic fields.

[0003] In order to have an appropriate operating time, heat-curing addition-type silicone rubber requires a larger proportion of vinyl silicone oil or the addition of acetylene alcohol substances as inhibitors. Although the addition of inhibitors prolongs the operating time, the curing speed is relatively slow without heating, which cannot meet the requirements of use scenarios that require fast curing at room temperature. In addition, it usually needs to be mixed into two components for storage.

[0004] Ultraviolet (UV)-cured addition silicone rubber can achieve long operating times without the addition of inhibitors. It can be cured within a few minutes after light exposure and can be configured as a single component. It does not require mixing during use and is easy to use. It has transparent or translucent characteristics and can be used in some optical fields.

[0005] CN107674640A discloses a UV-curable organic silicone liquid optical adhesive composition and a preparation method thereof. The UV-curable organic silicone liquid optical adhesive composition comprises the following components in percentage by mass: 50% to 70% vinyl silicone oil, 8% to 20% vinyl MQ silicone resin, 0% to 20% vinyl MDT silicone oil, 0% to 3% tackifier, 5% to 20% hydrogenated silicone oil, 0.5% to 3% multifunctional photoinitiator, 0.5% to 5% photoinitiator auxiliary, 0.5% to 3% free radical scavenger, and 0.001% to 0.005% inhibitor. The UV-curable organic silicone liquid optical adhesive composition provided by this technical solution can be rapidly photocured under UV conditions without generating white fog. However, the titanate coupling agent and borate coupling agent used in the tackifiers of this technical solution may have color problems, resulting in severe yellowing. In addition, small molecules such as the photoinitiator auxiliary are prone to precipitation problems after long storage time.

[0006] CN109306259A discloses a photocurable silicone adhesive and its use in touch screen bonding. The adhesive comprises the following components: 70-90 parts by weight of a methoxyvinyl silicone oil having the general formula I; 5-15 parts by weight of an epoxyhydrogenated silicone oil having the general formula II; 5-15 parts by weight of an epoxycyclohexyl hydrogenated silicone oil having the general formula III; 1-30 ppm of a platinum photocatalyst; and 0.01-0.5 parts by weight of a tackifier. The photocurable silicone adhesive produced by this method has a low curing temperature and a fast curing speed, exhibiting high bonding strength to touch screens and glass cover plates. However, the raw materials, such as the epoxyhydrogenated silicone oil and the epoxycyclohexyl hydrogenated silicone oil, require a hydrosilylation reaction and a platinum catalyst. However, the platinum catalyst is difficult to remove, which affects the shelf life of the adhesive.

[0007] In addition, the polarity of addition-type organic silicone in the existing technology is relatively weak, and many viscosity enhancers suitable for addition-type organic silicone require high-temperature curing to exert their bonding effect. Since the UV curing method does not involve heating treatment, the UV-cured addition-type organic silicone has relatively poor adhesion to the substrate.

[0008] Therefore, it is necessary to develop a light-curing organic silicone with good storage stability, good adhesion to the substrate, and not easy to yellow. Summary of the Invention

[0009] In order to solve the above technical problems, the present invention provides a light-curing organic silicone and its preparation method and application. The light-curing organic silicone has the characteristics of good storage stability, fast curing speed, good adhesion to glass and polyvinyl alcohol substrates, fast bonding onset time, and not easy to yellow.

[0010] To achieve this object, the present invention adopts the following technical solutions:

[0011] In a first aspect, the present invention provides a light-curing organic silicone, wherein the raw materials for preparing the light-curing organic silicone include the following components in mass percentage: 65% to 99% (e.g., 70%, 75%, 80%, 85%, 90% or 95%) of vinyl silicone oil, 0% to 31% (e.g., 1%, 4%, 7%, 10%, 13%, 16%, 19%, 22%, 25% or 28%) of terminal hydrogen silicone oil, 0.1% to 3% (e.g., 0.5%, 1%, 1.5%, 2% or 2.5%) of cross-linked hydrogen silicone oil, 0.5% to 1% (e.g., 0.55%, 0.6%) of dialkoxysilane containing epoxy group, %, 0.65%, 0.7%, 0.75%, 0.8%, 0.85%, 0.9% or 0.95%, etc.), 0.2% to 0.4% (e.g., 0.22%, 0.24%, 0.26%, 0.28%, 0.30%, 0.32%, 0.34%, 0.36% or 0.38%, etc.) of a dialkoxysilane containing an acryloxy group, and 0.0005% to 0.005% (e.g., 0.001%, 0.0015%, 0.002%, 0.0025%, 0.003%, 0.0035%, 0.004% or 0.0045%, etc.) of a UV type platinum catalyst.

[0012] The hydrogen content of the cross-linked hydrogen silicone oil is 8 to 16.6 mmol / g, for example, 9 mmol / g, 10 mmol / g, 11 mmol / g, 12 mmol / g, 13 mmol / g, 14 mmol / g, 15 mmol / g or 16 mmol / g.

[0013] In the present invention, by adding dialkoxysilane containing epoxy groups and dialkoxysilane containing acryloxy groups as tackifiers, and combining them with components such as vinyl silicone oil, cross-linked hydrogen silicone oil, and a UV-type platinum catalyst, the light-curing organic silicone rubber obtained has the characteristics of good storage stability, fast curing speed, good adhesion to glass and polyvinyl alcohol substrates, and is not easy to yellow.

[0014] In the present invention, the alkoxy groups in the dialkoxysilane containing epoxy groups and the dialkoxysilane containing acryloxy groups are easily hydrolyzed to form silanol groups. The silanol groups can react with cross-linked hydrogen silicone oil. The epoxy groups and acryloxy groups at the other ends have high polarity and can generate hydrogen bonds and other forces with groups on the surface of the substrate. The epoxy groups tend to have good adhesion to metals, glass, ceramics and some plastics; while the acryloxy groups have stronger polarity and are more likely to react with some plastic materials to improve the adhesion. The combination of the two makes the light-curing organic silicone have good adhesion to both glass and plastic materials. Acryloyloxy groups have relatively poor temperature resistance. When the content of dialkoxysilane containing acryloyloxy groups in the system exceeds 0.5%, after baking at 120℃ for more than 48 hours, the color of the light-cured organic silicone curing material will become seriously yellow, which is not conducive to long-term use. However, if the content is added too little, the bonding effect will deteriorate. Although the adhesion of epoxy groups is slightly worse than that of acryloyloxy groups, they can improve the yellowing problem at high temperatures. By compounding epoxy-containing dialkoxysilane and acryloxy-containing dialkoxysilane, and controlling the addition amount of epoxy-containing dialkoxysilane and acryloxy-containing dialkoxysilane, the bonding effect and yellowing resistance performance can be synergistically improved. There are some hydroxyl groups on the glass surface. Epoxy groups and acryloxy groups can easily react with the hydroxyl groups on the glass surface to produce covalent hydrogen bonds, thereby improving the adhesion of light-curing organic silicone to the glass; polyvinyl alcohol (PVA) is prepared by the alcoholysis of polyvinyl acetate, and its alcoholysis degree usually does not reach 100%. There are also many ester groups on the surface, which can easily react with highly polar acryloxy groups and epoxy groups. The joint action of epoxy groups and acryloxy groups can improve the bonding performance and the bonding time is fast.

[0015] In the present invention, based on the total mass of the raw materials for preparing the photocurable organic silicone as 100%, the mass of the UV type platinum catalyst is 0.0005% to 0.005%. The prepared photocurable organic silicone has a fast curing speed, good adhesion to the substrate and is not easy to yellow. If the mass of the UV type platinum catalyst is too high, the prepared photocurable organic silicone is prone to yellowing after curing. The UV type platinum catalyst releases platinum after being irradiated by UV light, and platinum plays a catalytic role. Platinum will be oxidized and blackened under high temperature conditions. When the amount is small, it will appear yellow, and the added amount needs to be controlled; if the mass of the UV type platinum catalyst is too low, the photocurable organic silicone cures slowly, so the amount of the UV type platinum catalyst must be controlled within an appropriate range.

[0016] In the present invention, hydrogen-containing silicone oil with a hydrogen content of more than 8 mmol / g is used as a cross-linking agent. When a cross-linking reaction occurs, due to the high hydrogen content, some hydrogen cannot participate in the cross-linking reaction in time due to the effect of steric hindrance. This part of hydrogen will react with the silanol group produced by the hydrolysis of the thickener, further enhancing the effect of the thickener.

[0017] In the present invention, the vinyl silicone oil is polydimethylsiloxane with a vinyl group at each end of the molecular chain.

[0018] Preferably, the viscosity of the vinyl silicone oil at 25° C. is 100 to 100,000 mPa·s, for example, 1,000 mPa·s, 5,000 mPa·s, 10,000 mPa·s, 50,000 mPa·s or 90,000 mPa·s.

[0019] Preferably, the vinyl content of the vinyl silicone oil is 0.02 to 0.2 mmol / g, for example, 0.04 mmol / g, 0.06 mmol / g, 0.08 mmol / g, 0.10 mmol / g, 0.12 mmol / g, 0.14 mmol / g, 0.16 mmol / g or 0.18 mmol / g.

[0020] In the present invention, vinyl silicone oil of one viscosity can be used alone, or vinyl silicone oils of different viscosities can be mixed and used.

[0021] Preferably, the viscosity of the hydrogen-terminated silicone oil at 25° C. is 10 to 1000 mPa·s, for example, 50 mPa·s, 100 mPa·s, 300 mPa·s, 500 mPa·s, 700 mPa·s or 900 mPa·s.

[0022] Preferably, the hydrogen content of the hydrogen-terminated silicone oil is 0.1 to 2 mmol / g, for example, 0.3 mmol / g, 0.5 mmol / g, 0.7 mmol / g, 0.9 mmol / g, 1.1 mmol / g, 1.5 mmol / g, 1.7 mmol / g or 1.9 mmol / g.

[0023] In the present invention, the hydrogen-terminated silicone oil can be used alone or in combination with hydrogen-terminated silicone oils of different viscosities.

[0024] In the present invention, the hydrogen-terminated silicone oil is polydimethylsiloxane having a silicon-hydrogen bond at each end of the molecular chain.

[0025] Preferably, the cross-linked hydrogen silicone oil is polymethylsiloxane containing at least three silicon-hydrogen bonds.

[0026] Preferably, the viscosity of the cross-linked hydrogen silicone oil at 25° C. is 10 to 100 mPa·s, for example, 20 mPa·s, 30 mPa·s, 40 mPa·s, 50 mPa·s, 60 mPa·s, 70 mPa·s, 80 mPa·s or 90 mPa·s.

[0027] In the present invention, the polymethylsiloxane containing at least three Si-H bonds may contain Si-H bonds on the side chains, or may contain both Si-H bonds on the terminal groups and Si-H bonds on the side chains. The cross-linked hydrogen silicone oil may be used alone or in combination with cross-linked hydrogen silicone oils of different viscosities.

[0028] Preferably, the epoxy group-containing dialkoxysilane includes 3-glycidyloxypropylmethyldimethoxysilane.

[0029] Preferably, the dialkoxysilane containing an acryloxy group includes 3-methacryloxypropylmethyldimethoxysilane.

[0030] In the present invention, the dialkoxysilane containing an epoxy group is preferably 3-glycidyloxypropylmethyldimethoxysilane; the dialkoxysilane containing an acryloxy group is preferably 3-methacryloxypropylmethyldimethoxysilane; 3-glycidyloxypropylmethyldimethoxysilane and 3-methacryloxypropylmethyldimethoxysilane have only two methoxy groups on each molecule, with low steric hindrance and high activity.

[0031] Preferably, the UV type platinum catalyst includes (trimethyl)methylcyclopentadienylplatinum and / or platinum acetylacetonate.

[0032] In the present invention, the UV-type platinum catalyst has good stability, can be used to prepare a single-component light-curing organic silica gel, can be stored stably for a long time, and is easy to use.

[0033] In the present invention, the photocurable organic silica gel can be cured under ultraviolet light irradiation, the wavelength of the ultraviolet light is preferably 365nm, and the intensity of the irradiation is preferably 2000-10000mW / cm 2 , for example 3000mW / cm 2 , 4000mW / cm 2 , 5000mW / cm 2 , 6000mW / cm 2 , 7000mW / cm 2 , 8000mW / cm 2 or 9000mW / cm 2 wait.

[0034] In a second aspect, the present invention provides a method for preparing the photocurable organic silicone as described in the first aspect, the preparation method comprising mixing vinyl silicone oil, optionally end-containing hydrogen silicone oil, cross-linked hydrogen silicone oil, epoxy group-containing dialkoxysilane, acryloxy group-containing dialkoxysilane and a UV-type platinum catalyst in an environment without ultraviolet light to obtain the photocurable organic silicone.

[0035] Preferably, the UV type platinum catalyst is diluted with vinyl silicone oil and then mixed with other components.

[0036] In a third aspect, the present invention provides an application of the light-curing organic silicone described in the first aspect in screen lamination or LED lamp packaging.

[0037] Compared with the prior art, the present invention has at least the following beneficial effects:

[0038] The present invention adds epoxy- and acryloxy-containing dialkoxysilanes as tackifiers, and combines them with vinyl silicone oil, cross-linked hydrogen silicone oil, and a UV-type platinum catalyst to produce a light-curing organic silicone rubber. The resulting material exhibits excellent storage stability, rapid curing, excellent adhesion to glass and polyvinyl alcohol substrates, a rapid onset of adhesion, and resistance to yellowing. The light-curing organic silicone rubber exhibits a surface-free time of ≤4 minutes, an onset of ≤35 minutes for glass, and a onset of ≤55 minutes for PVA. Furthermore, the resulting material exhibits a yellowing index (YI) value of ≤0.4 after curing and baking at 120°C for 48 hours. DETAILED DESCRIPTION

[0039] For the convenience of understanding the present invention, the present invention is given below with examples. It should be understood by those skilled in the art that the examples are only for the purpose of helping to understand the present invention and should not be regarded as specific limitations of the present invention.

[0040] The sources of some raw materials in the following examples and comparative examples are as follows.

[0041] (1) Vinyl silicone oil:

[0042] Vinyl silicone oil A, with a viscosity of 1000 mPa·s at 25°C and a vinyl content of 0.12 mmol / g, was manufactured by Anbiya and the brand name is AndisilVS1000;

[0043] Vinyl silicone oil B, with a viscosity of 10,000 mPa·s at 25°C and a vinyl content of 0.05 mmol / g, manufactured by Anbiya and brand name AndisilVS10000;

[0044] Vinyl silicone oil C, with a viscosity of 5000 mPa·s at 25°C and a vinyl content of 0.065 mmol / g, manufactured by Anbiya and branded AndisilVS5000;

[0045] Vinyl silicone oil D, with a viscosity of 65,000 mPa·s at 25°C and a vinyl content of 0.03 mmol / g, manufactured by Anbiya and branded AndisilVS65000;

[0046] Vinyl silicone oil E, with a viscosity of 100 mPa·s at 25°C and a vinyl content of 0.37 mmol / g, is manufactured by Anbiya and is designated AndisilVS100.

[0047] (2) End-containing hydrogen silicone oil

[0048] End-hydrogenated silicone oil A, with a viscosity of 1000 mPa·s at 25°C and a hydrogen content of 0.13 mmol / g, is manufactured by Runhe and is designated RH-DH02.

[0049] End-hydrogenated silicone oil B, with a viscosity of 35 mPa·s at 25°C and a hydrogen content of 0.7 mmol / g, is manufactured by Runhe and is designated RH-DH07.

[0050] End-hydrogenated silicone oil C has a viscosity of 10 mPa·s at 25°C and a hydrogen content of 1.8 mmol / g. The manufacturer is Shanghai Jingri New Materials.

[0051] (3) Cross-linked hydrogen silicone oil

[0052] Cross-linked hydrogen silicone oil A, with a viscosity of 100 mPa·s at 25°C and a hydrogen content of 12 mmol / g, is manufactured by Runhe and is designated RH-H512.

[0053] Cross-linked hydrogen silicone oil B, with a viscosity of 35 mPa·s at 25°C and a hydrogen content of 8 mmol / g, is manufactured by Runhe and is designated RH-HLC-3.

[0054] Cross-linked hydrogen silicone oil C, with a viscosity of 50 mPa·s at 25°C and a hydrogen content of 8.6 mmol / g, was manufactured by Anbiya and is marketed as Andisil XL1342.

[0055] Cross-linked hydrogen silicone oil D, with a viscosity of 30 mPa·s at 25°C and a hydrogen content of 16 mmol / g, is manufactured by Runhe and is designated RH-202.

[0056] Cross-linked hydrogen silicone oil E, with a viscosity of 18 mPa·s at 25°C and a hydrogen content of 10 mmol / g, is manufactured by Runhe and is designated RH-H510.

[0057] Cross-linked hydrogen silicone oil F has a viscosity of 50 mPa·s at 25° C. and a hydrogen content of 3 mmol / g. The manufacturer is Anbiya and the brand is Andisil XL1340.

[0058] (4) UV-type platinum catalyst solution A: composed of (trimethyl)methylcyclopentadienyl platinum and vinyl silicone oil (viscosity of 1000 mPa·s at 25°C, manufactured by Ambier, brand name AndisilVS1000), wherein the concentration of (trimethyl)methylcyclopentadienyl platinum is 0.5%;

[0059] UV type platinum catalyst solution B: composed of platinum acetylacetonate and vinyl silicone oil (viscosity of 1000 mPa·s at 25° C., manufacturer: Anbiya, brand: Andisil VS1000), wherein the concentration of platinum acetylacetonate is 0.5%.

[0060] Example 1

[0061] This embodiment provides a photocurable organic silicone and a preparation method thereof. The raw materials for preparing the photocurable organic silicone include the following components in percentage by mass: 65.3% vinyl silicone oil, 30.36% end-hydrogen silicone oil (end-hydrogen silicone oil A), 2.64% cross-linked hydrogen silicone oil (cross-linked hydrogen silicone oil A), 1% 3-glycidyloxypropylmethyldimethoxysilane, 0.2% 3-methacryloxypropylmethyldimethoxysilane, and 0.5% UV type platinum catalyst solution (UV type platinum catalyst solution A).

[0062] The vinyl silicone oil is composed of 55.3% by mass of vinyl silicone oil A and 10% by mass of vinyl silicone oil B.

[0063] The preparation method comprises the following steps:

[0064] Vinyl silicone oil, terminal hydrogen silicone oil, cross-linked hydrogen silicone oil, 3-glycidyloxypropylmethyldimethoxysilane, 3-methacryloxypropylmethyldimethoxysilane and UV type platinum catalyst solution are mixed in an environment without ultraviolet light to obtain the light-curing organic silica gel.

[0065] Examples 2 to 8 and Comparative Examples 1 to 7 respectively provide a photocurable organic silica gel and a preparation method thereof, which adopt the same preparation method as Example 1, except that the added raw materials and their contents are expressed in mass percentages, as shown in Tables 1 and 2.

[0066] Table 1

[0067]

[0068]

[0069] Table 2

[0070]

[0071]

[0072] In Table 1 and Table 2, “ / ” represents that the raw material was not added.

[0073] Comparative Example 8

[0074] This comparative example provides a photocurable organic silica gel and a preparation method thereof. The only difference between the comparative example and Example 8 is that 3-glycidyloxypropylmethyldimethoxysilane is replaced with 3-glycidyloxypropylmethyltrimethoxysilane, and other conditions are the same as those in Example 8.

[0075] Comparative Example 9

[0076] This comparative example provides a photocurable organic silica gel and a preparation method thereof. The only difference between the comparative example and Example 8 is that 3-methacryloxypropylmethyldimethoxysilane is replaced with 3-methacryloxypropylmethyltrimethoxysilane, and other conditions are the same as those in Example 8.

[0077] The following performance tests were performed on the light-curing organic silica gels provided in Examples 1 to 8 and Comparative Examples 1 to 9.

[0078] (1) Surface drying time: Place the light-curing silicone in a disposable plastic cup and use 5000mJ / cm 2 Irradiate with ultraviolet light of irradiation energy and time it. Touch the surface of the light-curing silicone rubber with your finger every 30 seconds. The time when it stops sticking to your hand is the surface drying time.

[0079] (2) Hardness: Pour the light-curing silicone rubber into a 6 mm thick mold and use 5000 mJ / cm 2 The steel was irradiated with radiation energy, baked in an oven at 60°C for 30 minutes, and then cooled for 30 minutes before hardness testing according to GB / T531.1-2008 using a Shore 00 hardness tester.

[0080] (3) Adhesion performance: Pour the light-curing organic silicone onto the surface of glass (the glass of the same commercial product was used for the test) and PVA substrate (the PVA substrate of the same commercial product was used for the test) respectively, and use 5000mJ / cm 2 The UV light with irradiation energy of irradiation energy was irradiated and timed. A position was selected every 5 minutes to peel off the light-curing organic silicone and observe the interface damage. The light-curing organic silicone could not be completely peeled off from the substrate by interface damage and reached cohesive failure. The time at this time was the bonding onset time.

[0081] (4) Yellowing index YI value: Use light-curing organic silicone to bond the upper and lower glass, using 5000mJ / cm 2 The test sample was cured by ultraviolet radiation with an irradiation energy of irradiation energy to form a test sample having a structure of an upper glass layer, a glue layer and a lower glass layer stacked in sequence, with the thickness of the upper glass layer being 0.7 mm, the thickness of the glue layer being 0.5 mm, and the thickness of the lower glass layer being 0.7 mm. The sample was then placed in an oven at 120°C for 48 hours and tested in accordance with ASTM E313-73.

[0082] The test results are shown in Table 3.

[0083] Table 3

[0084]

[0085] In Table 3, “ / ” means that the result was not measured.

[0086] The test results show that the surface drying time of the light-curing organic silicone provided in Examples 1 to 8 is ≤4 minutes, the bonding effectiveness time for bonding glass is ≤35 minutes, the bonding effectiveness time for bonding PVA is ≤55 minutes, and the yellowing index YI value after curing and baking at 120°C for 48 hours is ≤0.4, indicating good yellowing resistance.

[0087] Compared with Example 8, if 3-methacryloxypropylmethyldimethoxysilane is not added and the mass percentage of 3-glycidyloxypropylmethyldimethoxysilane is adjusted to 1% (Comparative Example 1), the bonding onset time to glass is extended. Within the 24h bonding performance test time, the peeling of the PVA bonding test shows interfacial damage, and cohesive damage cannot be achieved, and the bonding performance deteriorates.

[0088] Compared with Example 8, if 3-glycidyloxypropylmethyldimethoxysilane is not added, the mass percentage of 3-methacryloxypropylmethyldimethoxysilane is adjusted to 0.4%, and the mass percentage of vinyl silicone oil is adjusted to 97.81% (Comparative Example 2), the bonding onset time to glass is extended, and the peeling of the PVA bonding test within the 24-hour bonding performance test time shows interfacial damage, and cohesive damage cannot be achieved, and the bonding performance deteriorates.

[0089] Compared with Example 8, if 3-glycidyloxypropylmethyldimethoxysilane is not added and the mass percentage of 3-methacryloxypropylmethyldimethoxysilane is adjusted to 1% (Comparative Example 3), the yellowing index YI value increases after baking at 120° C. for 48 hours.

[0090] Compared with Example 8, if the mass percentage of 3-glycidyloxypropylmethyldimethoxysilane is adjusted to 0.5% and the mass percentage of 3-methacryloxypropylmethyldimethoxysilane is adjusted to 0.5% (Comparative Example 4), the yellowing index YI value increases and is greater than 0.5.

[0091] Compared with Example 8, if the mass percentage of 3-glycidyloxypropylmethyldimethoxysilane is adjusted to 0.9% and the mass percentage of 3-methacryloxypropylmethyldimethoxysilane is adjusted to 0.1% (Comparative Example 5), the adhesion to the PVA substrate will deteriorate.

[0092] Compared with Example 8, if the amount of the UV type platinum catalyst used is too much (Comparative Example 6), the yellowing index YI value increases.

[0093] Compared with Example 8, if the hydrogen content of the cross-linked hydrogen silicone oil is too low (Comparative Example 7), the glass takes effect slowly and the PVA cannot adhere.

[0094] Compared with Example 8, if 3-glycidyloxypropylmethyldimethoxysilane is replaced with 3-glycidyloxypropylmethyltrimethoxysilane (Comparative Example 8), the onset time for both glass and PVA substrates will be extended. The reason is that the three methoxy groups in 3-glycidyloxypropylmethyltrimethoxysilane have a large steric hindrance and relatively low activity.

[0095] Compared with Example 8, if 3-methacryloxypropylmethyldimethoxysilane is replaced with 3-methacryloxypropylmethyltrimethoxysilane (Comparative Example 9), the onset time for both glass and PVA substrates is extended. The reason is that the three methoxy groups in 3-methacryloxypropylmethyltrimethoxysilane have large steric hindrance and relatively low activity.

[0096] The applicant declares that the above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention fall within the scope of protection and disclosure of the present invention.

Claims

1. A light-curing organic silicone, characterized in that: The raw materials for preparing the light-curing organic silica gel include the following components by mass percentage: 65% to 99% of vinyl silicone oil, 0% to 31% of terminal hydrogen silicone oil, 0.1% to 3% of cross-linked hydrogen silicone oil, 0.5% to 1% of dialkoxy silane containing epoxy group, 0.2% to 0.4% of dialkoxy silane containing acryloxy group and 0.0005% to 0.005% of UV type platinum catalyst; The hydrogen content of the cross-linked hydrogen silicone oil is 8 to 16.6 mmol / g.

2. The light-curing organic silicone according to claim 1, characterized in that: The viscosity of the vinyl silicone oil at 25° C. is 100 to 100,000 mPa·s; Preferably, the vinyl content of the vinyl silicone oil is 0.02 to 0.2 mmol / g.

3. The light-curing organic silica gel according to claim 1 or 2, characterized in that: The viscosity of the hydrogen-terminated silicone oil at 25° C. is 10 to 1000 mPa·s; Preferably, the hydrogen content of the hydrogen-terminated silicone oil is 0.1 to 2 mmol / g.

4. The light-curing organic silica gel according to any one of claims 1 to 3, characterized in that: The cross-linked hydrogen silicone oil is a polymethylsiloxane containing at least three silicon-hydrogen bonds.

5. The light-curing organic silicone according to claim 4, characterized in that: The viscosity of the cross-linked hydrogen silicone oil at 25° C. is 10 to 100 mPa·s.

6. The light-curing organic silica gel according to any one of claims 1 to 5, characterized in that: The epoxy group-containing dialkoxysilane includes 3-glycidyloxypropylmethyldimethoxysilane.

7. The light-curing organic silica gel according to any one of claims 1 to 6, characterized in that: The dialkoxysilane containing an acryloxy group includes 3-methacryloxypropylmethyldimethoxysilane.

8. The light-curing organic silica gel according to any one of claims 1 to 7, characterized in that: The UV type platinum catalyst includes (trimethyl)methylcyclopentadienyl platinum and / or platinum acetylacetonate.

9. A method for preparing the light-curing organic silica gel according to any one of claims 1 to 8, characterized in that: The preparation method comprises mixing vinyl silicone oil, optionally terminal hydrogen silicone oil, cross-linked hydrogen silicone oil, epoxy group-containing dialkoxysilane, acryloxy group-containing dialkoxysilane and UV type platinum catalyst in an environment without ultraviolet light to obtain the light-curing organic silica gel.

10. Use of the light-curing organic silicone according to any one of claims 1 to 8 in screen lamination or LED lamp packaging.

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