Primer for addition type organic silicon pouring sealant and preparation method thereof

Abstract

The invention provides a primer for an addition type organic silicon pouring sealant and a preparation method of the primer. The primer for the addition type organic silicon pouring sealant comprises the following components in parts by weight: 5-20 parts of organic silicon resin, 5-20 parts of a T-type silicon resin cross-linking agent, 100 parts of an organic solvent and 1-10 parts of a catalyst. The primer for the addition type organic silicon pouring sealant, provided by the invention, has the advantages that the primer is easy to spray, the surface drying time is short, the cohesiveness is high, a paint film formed after curing is high in strength, and the bonding strength of the organic silicon pouring sealant to a base material can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of potting adhesives, and in particular relates to a primer for addition-type organic silicon potting adhesive and a preparation method thereof. Background Art

[0002] Silicone potting glue is used for potting, bonding, sealing and coating protection of electronic components. Before curing, silicone potting glue is in liquid state and has fluidity. The viscosity of the glue varies according to the material, performance and production process of the product. Silicone potting glue can only realize its use value after it is completely cured. After curing, it can play the role of waterproof, moisture-proof, dust-proof, insulation, heat conduction, confidentiality, corrosion resistance, temperature resistance and shockproof. Primer is used in the surface spraying and gluing process of plastic or metal substrates. It mainly solves the problems of poor spray bonding and gluing debonding, and has the function of improving the adhesion between the colloid and the substrate. Silicone potting glue has poor adhesion. Conventional silicone potting glue relies on the adsorption force of the colloid to adhere the silicone potting glue and the electronic component shell together. The silicone potting glue has poor bonding effect between the electronic component shell. When the electronic component is hit by external force and the shell is slightly deformed, the colloid of the silicone potting glue is easy to crack with the electronic component shell due to insufficient bonding strength, thereby affecting the waterproof effect of the electronic component.

[0003] The above problems can be solved well by using primer for silicone potting glue. Before pouring the silicone potting glue, spray the primer for silicone potting glue for primer coating. After the primer is dry, pour the glue. This can improve the bonding strength of silicone potting glue to the electronic component shell, better resist the adverse effects of shell deformation and shell cracking, and improve the protection and waterproof level of electronic components.

[0004] The surface drying time of the primers for silicone potting glue on the market is mostly 5 to 10 minutes. The long surface drying time greatly reduces the potting efficiency of silicone potting glue. The primers for silicone potting glue with fast surface drying often have poor adhesion due to insufficient working time with the substrate.

[0005] CN116179077A discloses a primer for addition-type silicone potting glue and a preparation method thereof. The primer for addition-type silicone potting glue comprises the following substances in parts by weight: 100 parts of organic solvent, 5-20 parts of silicone resin, 5-20 parts of silane cross-linking agent, 1-10 parts of silane coupling agent and 1-10 parts of catalyst. The primer for addition-type silicone potting glue prepared by this technical solution has a surface drying time of ≤90s, but its surface drying speed and shear strength still need to be further improved.

[0006] Therefore, it is necessary to develop a primer for addition-type silicone potting adhesive that is easy to spray, dries quickly, and has strong adhesion. Summary of the invention

[0007] In view of the deficiencies in the prior art, the object of the present invention is to provide a primer for addition-type silicone potting glue and a preparation method thereof. The primer for addition-type silicone potting glue is easy to spray, has a short surface drying time, strong adhesion, and a high strength of the paint film formed after curing, and can improve the bonding strength of the silicone potting glue to the substrate.

[0008] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0009] In a first aspect, the present invention provides a primer for an addition-type silicone potting adhesive, wherein the primer for an addition-type silicone potting adhesive comprises the following components in parts by weight: 5 to 20 parts (e.g., 7 parts, 9 parts, 11 parts, 13 parts, 15 parts, 17 parts, or 19 parts, etc.) of a silicone resin, 5 to 20 parts (e.g., 7 parts, 9 parts, 11 parts, 13 parts, 15 parts, 17 parts, or 19 parts, etc.) of a T-type silicone resin crosslinking agent, 100 parts of an organic solvent, and 1 to 10 parts (e.g., 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, or 9 parts, etc.) of a catalyst.

[0010] In the present invention, the primer for addition-type silicone potting glue adopts a T-type silicone resin cross-linking agent instead of a traditional silane cross-linking agent, which can improve the cross-linking density of the primer for addition-type silicone potting glue after curing, and the paint film formed after curing has high strength and better performance; the primer for addition-type silicone potting glue prepared by compounding silicone resin, T-type silicone resin cross-linking agent and catalyst has a short surface drying time, thereby improving the potting efficiency of silicone potting glue; the primer for addition-type silicone potting glue is applied to the surface of the substrate, and after the primer is dried, the organic silicon resin cross-linking agent is applied to the substrate. The silicone potting glue is potted on the substrate, which can effectively improve the bonding strength of the silicone potting glue to the substrate. In this process, under the action of the catalyst, the silanyl methoxy group in the primer for the addition type silicone potting glue undergoes hydrolysis or alcoholysis reaction to become silanol (i.e., forming silanol), which can react with the free radicals on the surface of the substrate (such as the housing of the electronic components) and the hydrogen bonds in the silicone potting glue, forming a "bridge" between the three. Through the "bridge" effect, the silicone potting glue is tightly adhered to the surface of the substrate, thereby having excellent bonding performance. The addition type silicone potting glue primer has a high organic solvent content and is easy to spray.

[0011] Preferably, the organic silicone resin includes any one of methyl MQ silicone resin, vinyl MQ silicone resin, hydrogen-containing silicone resin or methyl phenyl silicone resin, or a combination of at least two thereof.

[0012] Preferably, the structural formula of the methyl MQ silicone resin is [(CH3)3SiO 1 / 2 ] a [SiO 4 / 2 ] b, wherein a and b are each independently selected from an integer of 100 to 5000, for example, 1000, 1500, 2000, 2500, 3000, 3500, 4000 or 4500, etc.

[0013] Preferably, the structural formula of the vinyl MQ silicone resin is CH2=CH[(CH3)3SiO 1 / 2 ] c [SiO 4 / 2 ] d CH=CH2, wherein c and d are each independently selected from an integer of 100 to 5000, for example, 1000, 1500, 2000, 2500, 3000, 3500, 4000 or 4500, etc.

[0014] Preferably, the structural formula of the hydrogen-containing silicone resin is [(CH3)2HSiO 1 / 2 ] e [SiO 4 / 2 ] f , wherein e and f are each independently selected from an integer of 100 to 5000, for example, 1000, 1500, 2000, 2500, 3000, 3500, 4000 or 4500, etc.

[0015] Preferably, the structural formula of the methylphenyl silicone resin is [(CH3)2C6H5SiO 1 / 2 ] g [SiO 4 / 2 ] h , wherein g and h are each independently selected from an integer of 100 to 5000, for example, 1000, 1500, 2000, 2500, 3000, 3500, 4000 or 4500, etc.

[0016] Preferably, the structural formula of the T-type silicone resin crosslinker is R1OSiO 1 / 2 {[(R2)2SiO 1 / 2 ] p Si(OR2) m (R3) n}3, wherein R1 and R2 are each independently selected from any one of -CH3, -CH2CH3 or -C6H5, R3 is selected from any one of -OCH3, -OCH2CH3 or -OCH2CH2CH3, p is an integer from 1 to 120 (for example, 10, 30, 50, 70, 90 or 110, etc.), n is an integer from 1 to 3 (for example, 2), and m+n=3.

[0017] Preferably, p is an integer of 5 to 30 (eg, 8, 11, 14, 17, 20, 23, 26 or 29, etc.).

[0018] Preferably, the weight average molecular weight of the T-type silicone resin crosslinking agent is 200-10000, for example, 500, 1000, 2000, 3000, 4000, 5000, 6000, 7000, 8000 or 9000, and more preferably 500-2500.

[0019] In the present invention, the T-type silicone resin cross-linking agent can be prepared by a method known in the art, which will not be described in detail herein.

[0020] Preferably, the organic solvent includes any one of an aliphatic hydrocarbon solvent, an aromatic hydrocarbon solvent, an alcohol solvent, an ether solvent or an ester solvent, or a combination of at least two thereof.

[0021] Preferably, the aliphatic hydrocarbon solvent includes an aliphatic hydrocarbon solvent having 1 to 10 carbon atoms (eg, 2, 3, 4, 5, 6, 7, 8 or 9, etc.).

[0022] Preferably, the aliphatic hydrocarbon solvent having 1 to 10 carbon atoms includes any one of pentane, hexane or octane, or a combination of at least two of them.

[0023] Preferably, the aromatic hydrocarbon solvent includes any one of benzene, toluene or xylene, or a combination of at least two of them.

[0024] Preferably, the alcohol solvent includes any one of methanol, ethanol or isopropanol, or a combination of at least two of them.

[0025] Preferably, the ether solvent includes diethyl ether and / or methyl ethyl ether.

[0026] Preferably, the catalyst comprises a titanate catalyst.

[0027] Preferably, the titanate catalyst includes any one of tetra-n-propyl titanate, tetra-isopropyl titanate, ethyl titanate, tetra-butyl titanate, tetra-isobutyl titanate or a titanate complex, or a combination of at least two thereof.

[0028] In a second aspect, the present invention provides a method for preparing a primer for addition-type silicone potting adhesive as described in the first aspect, the preparation method comprising the following steps: mixing a silicone resin, a T-type silicone resin cross-linking agent, an organic solvent and a catalyst to obtain the primer for addition-type silicone potting adhesive.

[0029] Preferably, the mixing is performed under vacuum conditions.

[0030] Preferably, the mixing is carried out at a temperature of 20 to 30°C (e.g., 21°C, 22°C, 23°C, 24°C, 25°C, 26°C, 27°C, 28°C or 29°C, etc.) and for a time of 5 to 30 min (e.g., 8 min, 11 min, 14 min, 17 min, 20 min, 23 min, 26 min or 29 min, etc.).

[0031] Preferably, the vacuum degree of the vacuum condition is 0.01-0.1 MPa, for example, 0.02 MPa, 0.03 MPa, 0.04 MPa, 0.05 MPa, 0.06 MPa, 0.07 MPa, 0.08 MPa or 0.09 MPa.

[0032] Preferably, the mixing further includes a step of nitrogen filling for protection.

[0033] It should be noted that the primer for addition-type silicone potting adhesive of the present invention needs to meet the following conditions for the bonded silicone potting adhesive, wherein the silicone potting adhesive includes vinyl silicone oil, hydrogen-containing silicone oil and a platinum catalyst.

[0034] Preferably, the organic silicone potting adhesive is a two-component organic silicone potting adhesive, and the two-component organic silicone potting adhesive includes an A agent and a B agent.

[0035] Preferably, agent A in the two-component silicone potting glue includes the following components in parts by weight: 100 parts of vinyl silicone oil, 5 to 20 parts of hydrogen-containing silicone oil (for example, 7 parts, 9 parts, 11 parts, 13 parts, 15 parts, 17 parts or 19 parts, etc.) and 0 to 300 parts of powder filler (for example, 30 parts, 60 parts, 90 parts, 120 parts, 150 parts, 180 parts, 210 parts, 240 parts or 270 parts, etc.).

[0036] Preferably, agent B in the two-component silicone potting glue includes the following components in parts by weight: 100 parts of vinyl silicone oil, 0.01 to 0.05 parts of platinum catalyst (for example, 0.015 parts, 0.020 parts, 0.025 parts, 0.030 parts, 0.035 parts, 0.040 parts or 0.045 parts, etc.) and 0 to 300 parts of powder filler (for example, 30 parts, 60 parts, 90 parts, 120 parts, 150 parts, 180 parts, 210 parts, 240 parts or 270 parts, etc.).

[0037] Preferably, the powder fillers in Agent A and Agent B each independently include silicon micropowder.

[0038] Preferably, the mass ratio of agent A to agent B is 1:(0.5-1.5), for example, 1:0.6, 1:0.7, 1:0.8, 1:0.9, 1:1.0, 1:1.1, 1:1.2, 1:1.3 or 1:1.4, etc.

[0039] In the present invention, the agent A and the agent B can be cured into an elastomer at room temperature or under heating conditions after being mixed.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] In the present invention, the primer for addition-type silicone potting glue has the characteristics of easy spraying, short surface drying time, strong adhesion, high paint film strength after curing, and can improve the bonding strength of silicone potting glue to the substrate. The surface drying time of the primer for addition-type silicone potting glue is 28 to 35 seconds, and the tensile shear strength after coating the silicone potting glue is 2.5 to 3.5 MPa. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is the tensile shear strength test specimen diagram;

[0043] Among them, 1- silicone potting glue mixture; 2- aluminum sheet. DETAILED DESCRIPTION

[0044] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0045] The sources of some components in the following examples and comparative examples are as follows:

[0046] Hexane: commercially available from Dongguan Liancheng New Materials Co., Ltd.

[0047] Methanol: Commercially available, the manufacturer is Dongguan Liancheng New Materials Co., Ltd.;

[0048] Xylene: commercially available from Dongguan Liancheng New Materials Co., Ltd.

[0049] Ether: commercially available from Dongguan Liancheng New Materials Co., Ltd.

[0050] Tetrabutyl titanate: commercially available from Hubei New Blue Sky New Materials Co., Ltd.

[0051] Tetraisopropyl titanate: commercially available from Hubei New Blue Sky New Materials Co., Ltd.

[0052] Titanate complex: brand D-60, commercially available, manufacturer is Hubei New Blue Sky New Materials Co., Ltd.;

[0053] Methyltrimethoxysilane: commercially available from Hubei New Blue Sky New Materials Co., Ltd.

[0054] Vinyl triethoxysilane: commercially available from Hubei New Blue Sky New Materials Co., Ltd.

[0055] Tetraethyl orthosilicate Si28: commercially available, the manufacturer is Hubei New Blue Sky New Materials Co., Ltd.;

[0056] Tetraethyl orthosilicate Si40: commercially available, the manufacturer is Hubei New Blue Sky New Materials Co., Ltd.;

[0057] Example 1

[0058] The present embodiment provides a primer for addition-type silicone potting adhesive and a preparation method thereof, wherein the primer for addition-type silicone potting adhesive comprises the following components in parts by weight: 10 parts of silicone resin (methyl MQ silicone resin), 5 parts of T-type silicone resin crosslinking agent, 100 parts of organic solvent (hexane) and 5 parts of catalyst (tetrabutyl titanate);

[0059] The above-mentioned methyl MQ silicone resin is methyl MQ silicone resin (DT-6102-1) produced by Guangzhou Delta Organic Silicone Technology Development Co., Ltd.;

[0060] The structural formula of the T-type silicone resin crosslinking agent is CH3OSiO 1 / 2 {[(CH3)2SiO 1 / 2 ] 20 Si(OCH3)2OCH2CH3}3, its weight average molecular weight is 1500.

[0061] The preparation method comprises the following steps: mixing the silicone resin, T-type silicone resin crosslinking agent, organic solvent and catalyst at 25° C. for 30 minutes using a disperser under vacuum conditions with a vacuum degree of 0.05 MPa, vacuuming and degassing, and then filling with nitrogen for protection to obtain the primer for the addition-type silicone potting glue.

[0062] Example 2

[0063] The present embodiment provides a primer for addition-type silicone potting adhesive and a preparation method thereof, wherein the primer for addition-type silicone potting adhesive comprises the following components in parts by weight: 5 parts of silicone resin (vinyl MQ silicone resin), 10 parts of T-type silicone resin crosslinking agent, 100 parts of organic solvent (methanol) and 1 part of catalyst (tetraisopropyl titanate);

[0064] The structural formula of the above vinyl MQ silicone resin is Vinyl MQ Silicone Resin (DT-2.7) produced by Guangzhou Delta Organic Silicone Technology Development Co., Ltd.;

[0065] The structural formula of the T-type silicone resin crosslinking agent is CH3OSiO 1 / 2 {[(Ph)2SiO 1 / 2 ] 30 SiOCH3(OCH2CH3)2}3, its weight average molecular weight is 2200.

[0066] The preparation method comprises the following steps: mixing the silicone resin, T-type silicone resin crosslinking agent, organic solvent and catalyst at 25° C. for 30 minutes using a disperser under vacuum conditions with a vacuum degree of 0.05 MPa, vacuuming and degassing, and then filling with nitrogen for protection to obtain the primer for the addition-type silicone potting glue.

[0067] Example 3

[0068] The present embodiment provides a primer for addition-type silicone potting adhesive and a preparation method thereof, wherein the primer for addition-type silicone potting adhesive comprises the following components in parts by weight: 20 parts of silicone resin (hydrogen-containing silicone resin), 15 parts of T-type silicone resin crosslinking agent, 100 parts of organic solvent (xylene) and 10 parts of catalyst (tetraisopropyl titanate);

[0069] The above hydrogen-containing silicone resin is IOTA207 from Anhui Iyota Silicone Oil Co., Ltd.;

[0070] The structural formula of the T-type silicone resin crosslinking agent is CH3OSiO 1 / 2 {[(CH2CH3)2SiO 1 / 2 ] 10 Si(OCH3)2OCH2CH2CH3}3, its weight average molecular weight is 750.

[0071] The preparation method comprises the following steps: mixing the silicone resin, T-type silicone resin crosslinking agent, organic solvent and catalyst at 25° C. for 30 minutes using a disperser under vacuum conditions with a vacuum degree of 0.05 MPa, vacuuming and degassing, and then filling with nitrogen for protection to obtain the primer for the addition-type silicone potting glue.

[0072] Example 4

[0073] The present embodiment provides a primer for addition-type silicone potting adhesive and a preparation method thereof, wherein the primer for addition-type silicone potting adhesive comprises the following components in parts by weight: 5 parts of silicone resin (methylphenyl silicone resin), 20 parts of T-type silicone resin crosslinking agent, 100 parts of organic solvent (ether) and 1 part of catalyst (titanate complex);

[0074] IOTA6156C of Anhui Iyota Silicone Oil Co., Ltd. of the above-mentioned methylphenyl silicone resin;

[0075] The structural formula of the T-type silicone resin crosslinking agent is CH3OSiO 1 / 2 {[(CH2CH3)2SiO 1 / 2 ] 90 Si(OCH3)2OCH2CH2CH3}3, its weight average molecular weight is 7000.

[0076] The preparation method comprises the following steps: mixing the silicone resin, T-type silicone resin crosslinking agent, organic solvent and catalyst at 25° C. for 30 minutes using a disperser under vacuum conditions with a vacuum degree of 0.05 MPa, vacuuming and degassing, and then filling with nitrogen for protection to obtain the primer for the addition-type silicone potting glue.

[0077] Example 5

[0078] This embodiment provides a primer for addition-type silicone potting glue and a preparation method thereof. The difference between this embodiment and embodiment 1 is that the structural formula of the T-type silicone resin crosslinking agent is CH3OSiO 1 / 2 {[(CH3)2SiO 1 / 2 ] 120 Si(OCH3)2OCH2CH3}3, its weight average molecular weight is 9000.

[0079] Other conditions are the same as in Example 1.

[0080] Example 6

[0081] This embodiment provides a primer for addition-type silicone potting glue and a preparation method thereof. The difference between this embodiment and embodiment 1 is that the structural formula of the T-type silicone resin crosslinking agent is CH3OSiO 1 / 2 {[(CH3)2SiO 1 / 2 ]4Si(OCH3)2OCH2CH3}3, its weight average molecular weight is 300.

[0082] Other conditions are the same as in Example 1.

[0083] Comparative Example 1

[0084] This comparative example provides a primer for addition-type silicone potting adhesive and a preparation method thereof, which is different from Example 1 only in that no T-type silicone resin cross-linking agent is added, and other conditions are the same as Example 1.

[0085] Comparative Example 2

[0086] This comparative example provides a primer for addition-type silicone potting adhesive and a preparation method thereof, which is different from Example 1 only in that the weight portion of the T-type silicone resin cross-linking agent is adjusted by 2 parts, and other conditions are the same as Example 1.

[0087] Comparative Example 3

[0088] This comparative example provides a primer for addition-type silicone potting adhesive and a preparation method thereof, which is different from Example 1 only in that the weight portion of the T-type silicone resin cross-linking agent is adjusted to 25 parts, and other conditions are the same as Example 1.

[0089] Comparative Example 4

[0090] This comparative example provides a primer for addition-type silicone potting adhesive and a preparation method thereof, which is different from Example 1 only in that the T-type silicone resin crosslinking agent is replaced with methyltrimethoxysilane of the same mass, and other conditions are the same as Example 1.

[0091] Comparative Example 5

[0092] This comparative example provides a primer for addition-type silicone potting adhesive and a preparation method thereof, which is different from Example 1 only in that the T-type silicone resin crosslinking agent is replaced with vinyl triethoxysilane of the same mass, and other conditions are the same as Example 1.

[0093] Comparative Example 6

[0094] This comparative example provides a primer for addition-type silicone potting glue and a preparation method thereof, which differs from Example 1 only in that the T-type silicone resin crosslinking agent is replaced with tetraethyl orthosilicate Si28 of the same mass, and other conditions are the same as those in Example 1.

[0095] Comparative Example 7

[0096] This comparative example provides a primer for addition-type silicone potting glue and a preparation method thereof, which differs from Example 1 only in that the T-type silicone resin crosslinking agent is replaced with tetraethyl orthosilicate Si40 of the same mass, and other conditions are the same as those in Example 1.

[0097] The following tests were performed on the primer for addition type silicone potting adhesive provided in the above Examples 1 to 6 and Comparative Examples 1 to 7:

[0098] (1) Surface drying time: The test is conducted in accordance with GB / T 13477.5-2002B method, which specifically includes evenly coating the primer of the addition silicone potting adhesive on the test substrate (aluminum sheet) with a coating thickness of 5 μm and testing the time required for the surface drying by the finger touch method.

[0099] (2) Tensile shear strength: The test was conducted in accordance with GB / T 7124-2008, specifically including uniformly coating the primer for addition-type silicone potting adhesive on the test substrate (aluminum sheet). The thickness of the substrate (aluminum sheet) was 2 mm and the coating thickness was 5 μm. After the primer for addition-type silicone potting adhesive was dry, the silicone potting adhesive mixture was coated between the two substrates. The coated silicone potting adhesive mixture was in the shape of a rectangular parallelepiped of 25 mm × 12.5 mm × 2 mm, such as Figure 1 As shown, the sample is then placed at room temperature (25°C) for curing. After being completely cured, a tensile shear strength test is performed on the sample using a testing machine at a tensile speed of 5 mm / min.

[0100] The above-mentioned silicone potting glue mixture is prepared by mixing agent A and agent B of the silicone potting glue in a mass ratio of 1:1 and vacuum degassing; the agent A includes the following components in parts by weight: 100 parts of vinyl silicone oil (viscosity at 25°C is 300mPa·s, vinyl mass fraction is 1.3%), 10 parts of hydrogen-containing silicone oil (viscosity at 25°C is 110mPa·s, active hydrogen mass fraction is 0.18%) and 100 parts of powder filler (silicon micropowder); the agent B includes the following components in parts by weight: 100 parts of vinyl silicone oil (viscosity at 25°C is 300mPa·s, vinyl mass fraction is 1.3%), 0.02 parts of platinum catalyst (3000ppm platinum catalyst produced by Guiyan Chemical Materials Co., Ltd.) and 100 parts of powder filler (silicon micropowder).

[0101] The test results are shown in Table 1 below.

[0102] Table 1

[0103]

[0104]

[0105] It can be seen from the content of Table 1 that the surface drying time of the primer for addition type silicone potting adhesive provided in Examples 1 to 6 is 28 to 35 seconds, and the tensile shear strength after coating the silicone potting adhesive is 2.5 to 3.5 MPa.

[0106] Compared with Example 1, if the weight average molecular weight of the T-type silicone resin cross-linking agent is too large (Example 5), the viscosity of the T-type silicone resin cross-linking agent increases, resulting in a high viscosity of the primer for the addition-type silicone potting glue, a prolonged surface drying time, and a disadvantage for construction and solvent volatilization; if the weight average molecular weight of the T-type silicone resin cross-linking agent is too small (Example 6), the chain segments of the T-type silicone resin cross-linking agent are too short, which has limited improvement on the strength of the primer for the addition-type silicone potting glue, and the tensile shear strength after coating the silicone potting glue is reduced.

[0107] Compared with Example 1, if no T-type silicone resin crosslinking agent is added (Comparative Example 1) or the weight portion of the T-type silicone resin crosslinking agent added is too low (Comparative Example 2), the tensile shear strength after coating the silicone potting glue is low.

[0108] Compared with Example 1, if the weight proportion of the added T-type silicone resin crosslinking agent is too high (Comparative Example 3), the excess T-type silicone resin crosslinking agent cannot participate in the reaction, resulting in a prolonged surface drying time of the primer for the addition-type silicone potting adhesive and a decrease in the tensile shear strength.

[0109] Compared with Example 1, if the T-type silicone resin crosslinking agent is replaced with methyltrimethoxysilane of the same mass (Comparative Example 4), the tensile shear strength after coating the silicone potting glue is low.

[0110] Compared with Example 1, if the T-type silicone resin crosslinking agent is replaced with vinyl triethoxysilane of the same mass (Comparative Example 5), the tensile shear strength after coating the silicone potting glue is low.

[0111] Compared with Example 1, if the T-type silicone resin crosslinking agent is replaced with the same mass of tetraethyl orthosilicate Si28 (Comparative Example 6), the tensile shear strength after coating the silicone potting glue is low.

[0112] Compared with Example 1, if the T-type silicone resin crosslinking agent is replaced with the same mass of tetraethyl orthosilicate Si40 (Comparative Example 7), the tensile shear strength after coating the silicone potting glue is low.

[0113] The applicant declares that the present invention illustrates the process method of the present invention through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned process steps, that is, it does not mean that the present invention must rely on the above-mentioned process steps to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of the raw materials selected by the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A primer for addition-type silicone potting adhesive, characterized in that: The primer for addition-type silicone potting adhesive comprises the following components in parts by weight: 5 to 20 parts of silicone resin, 5 to 20 parts of T-type silicone resin crosslinking agent, 100 parts of organic solvent and 1 to 10 parts of catalyst.

2. The primer for addition type silicone potting adhesive according to claim 1, characterized in that: The organic silicone resin includes any one of methyl MQ silicone resin, vinyl MQ silicone resin, hydrogen-containing silicone resin or methyl phenyl silicone resin, or a combination of at least two thereof.

3. The primer for addition type silicone potting adhesive according to claim 1 or 2, characterized in that: The structural formula of the methyl MQ silicone resin is [(CH3)3SiO 1 / 2 ] a [SiO 4 / 2 ] b , wherein a and b are each independently selected from an integer of 100 to 5000; Preferably, the structural formula of the vinyl MQ silicone resin is CH2=CH[(CH3)3SiO 1 / 2 ] c [SiO 4 / 2 ] d CH=CH2, wherein c and d are each independently selected from an integer of 100 to 5000; Preferably, the structural formula of the hydrogenated silicone resin is [(CH3)2HSiO 1 / 2 ] e [SiO 4 / 2 ] f , wherein e and f are each independently selected from an integer of 100 to 5000; Preferably, the structural formula of the methylphenyl silicone resin is [(CH3)2C6H5SiO 1 / 2 ] g [SiO 4 / 2 ] h , wherein g and h are each independently selected from an integer ranging from 100 to 5000.

4. The primer for addition type silicone potting adhesive according to any one of claims 1 to 3, characterized in that: The structural formula of the T-type silicone resin crosslinking agent is R1OSiO 1 / 2 {[(R2)2SiO 1 / 2 ] p Si(OR2) m (R3) n }3, wherein R1 and R2 are each independently selected from any one of -CH3, -CH2CH3 or -C6H5, R3 is selected from any one of -OCH3, -OCH2CH3 or -OCH2CH2CH3, p is an integer from 1 to 120, n is an integer from 1 to 3, and m+n=3.

5. The primer for addition type silicone potting adhesive according to any one of claims 1 to 4, characterized in that: The weight average molecular weight of the T-type silicone resin cross-linking agent is 200 to 10,000.

6. The primer for addition type silicone potting adhesive according to any one of claims 1 to 5, characterized in that: The organic solvent includes any one of aliphatic hydrocarbon solvents, aromatic hydrocarbon solvents, alcohol solvents, ether solvents or ester solvents, or a combination of at least two of them.

7. The primer for addition type silicone potting adhesive according to claim 6, characterized in that: The aliphatic hydrocarbon solvent includes an aliphatic hydrocarbon solvent having 1 to 10 carbon atoms; Preferably, the aliphatic hydrocarbon solvent having 1 to 10 carbon atoms includes any one of pentane, hexane or octane, or a combination of at least two thereof; Preferably, the aromatic hydrocarbon solvent includes any one of benzene, toluene or xylene, or a combination of at least two thereof; Preferably, the alcohol solvent includes any one of methanol, ethanol or isopropanol, or a combination of at least two thereof; Preferably, the ether solvent includes diethyl ether and / or methyl ethyl ether.

8. The primer for addition type silicone potting adhesive according to any one of claims 1 to 7, characterized in that: The catalyst comprises a titanate catalyst; Preferably, the titanate catalyst includes any one of tetra-n-propyl titanate, tetra-isopropyl titanate, ethyl titanate, tetra-butyl titanate, tetra-isobutyl titanate or a titanate complex, or a combination of at least two thereof.

9. A method for preparing a primer for addition-type silicone potting adhesive according to any one of claims 1 to 8, characterized in that: The preparation method comprises the following steps: mixing an organic silicon resin, a T-type silicone resin cross-linking agent, an organic solvent and a catalyst to obtain the primer for the addition-type organic silicon potting adhesive.

10. The preparation method according to claim 9, characterized in that: The mixing is carried out under vacuum conditions; Preferably, the mixing temperature is 20-30°C and the time is 5-30 minutes; Preferably, the vacuum degree of the vacuum condition is 0.01-0.1 MPa.

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