A low-viscosity two-component addition-curing silicone gel and its preparation method

Abstract

The present invention provides a low-viscosity two-component addition-curing silicone gel, which is composed of component A and component B mixed in a weight ratio of 1:1. The components in component A are vinyl silicone oil, mono-terminal vinyl silicone oil, POSS-modified vinyl silicone oil, branched-chain vinyl silicone oil, silicone color paste and Karstedt catalyst; the components in component B are vinyl silicone oil, mono-terminal vinyl silicone oil, POSS-modified vinyl silicone oil, branched-chain vinyl silicone oil, low hydrogen-containing silicone oil, terminal hydrogen-containing silicone oil and inhibitor. The present invention also provides a preparation method for the low-viscosity two-component addition-curing silicone gel. This two-component addition-curing silicone gel has the characteristics of low viscosity, good permeability, resistance to thermal shock, stable cone penetration and good self-healing property, and can be used for potting protection of various electronic components, PCBs, IGBTs, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of adhesives, and particularly to a low-viscosity two-component addition-curing silicone gel and a preparation method thereof. Background Art

[0002] Silicone products can be roughly divided into addition-curing type and condensation-curing type, etc. Among them, addition-curing silicone has the characteristics of not generating by-products, being curable at room temperature or high temperature, and having balanced performance. Among addition-curing silicone products, there is a type of product called addition-curing silicone gel. The curing mechanism of addition-curing silicone gel is the hydrosilylation reaction, which theoretically does not generate by-products, has a high conversion rate, and is easy to control the crosslinking density and speed. Addition-curing silicone gel has the characteristics of good flexibility, balanced strength, high transparency, etc. At the same time, silicone gel products are flexible and have self-healing properties, so they have excellent shock absorption and detachable repair properties, and are widely used in various industries such as electronic components, internal coating of transistors and integrated circuits, and automotive manufacturing.

[0003] Currently, common silicone gel products on the market either use a large amount of non-reactive components, such as dimethyl silicone oil, etc., in pursuit of high penetrability, resulting in problems such as oil bleeding and substrate contamination during long-term use; or use materials such as silicone resin and fumed silica in pursuit of high strength and heat resistance, resulting in problems such as high cost, unstable penetrability, insufficient tensile strength or elongation, and high viscosity. Especially when silicone gel products are used for potting protection of various electronic components, as a protective layer, it needs to have the following characteristics: excellent reparability, good flexibility, excellent seismic resistance, extremely low internal stress, excellent fluidity, excellent self-defoaming property, and stable protection. Therefore, higher requirements are put forward for the performance of silicone gel materials. Summary of the Invention

[0004] The present invention provides a low-viscosity two-component addition-curing silicone gel and a preparation method thereof. The two-component addition-curing silicone gel has the characteristics of low viscosity, good permeability, resistance to thermal shock, stable penetrability, good self-healing property, etc., and can be used for potting protection of various electronic components, PCBs, IGBTs, etc.

[0005] The technical solution adopted to achieve the above object of the present invention is as follows:

[0006] A low-viscosity two-component addition-curing silicone gel, the low-viscosity two-component addition-curing silicone gel is composed of component A and component B, wherein the components and mass fractions in component A are:

[0007]

[0008]

[0009] The components and mass fractions in component B are:

[0010]

[0011] The A component and the B component are mixed according to a weight ratio of 1:1.

[0012] The vinyl silicone oil is a conventional commercially available product with a viscosity of 50 - 5000 mPa·s, preferably 50 - 1000 mPa·s. According to application requirements, an electronic grade specification can be selected, and its structural formula is:

[0013] The viscosity of the mono - terminal vinyl silicone oil is 20 - 1000 mPa·s, preferably 50 - 300 mPa·s, and its structural formula is:

[0014]

[0015] The viscosity of the POSS - modified vinyl silicone oil is 100 - 10000 mPa·s, preferably 100 - 1000 mPa·s, and its structural formula is: (POSS - modified vinyl silicone oil 1) or (POSS - modified vinyl silicone oil 2); where Preferably, it is POSS - modified vinyl silicone oil 2.

[0016] The POSS - modified vinyl silicone oil is obtained by the equilibrium reaction and refining of a POSS monomer, cage - type octavinyl polyhedral oligomeric silsesquioxane or octatetramethylammonium silicate, with D3 - D5 (D3 is hexamethylcyclotrisiloxane, D4 is octamethylcyclotetrasiloxane, D5 is decamethylcyclopentasiloxane, vinyl double - end capper, and a catalyst);

[0017] Among them, the structural formula of cage - type octavinyl polyhedral oligomeric silsesquioxane is

[0018] The structural formula of octatetramethylammonium silicate is

[0019] The synthesis route of the POSS - modified silicone oil is:

[0020]

[0021] Among them, the catalyst is a strong base catalyst, the polymerization temperature is 60 - 120 °C, and the catalyst - breaking temperature is 130 - 160 °C.

[0022] The viscosity of the branched - chain vinyl silicone oil is 50 - 1000 mPa·s, preferably 50 - 250 mPa·s, and its structural formula is:

[0023] (Branched - chain vinyl silicone oil 1) or (branched vinyl silicone oil 2), preferably branched vinyl silicone oil 2;

[0024] wherein R 1 is vinyl, and R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 is one or a combination of more of methyl, ethyl, vinyl, propyl, chloropropyl, phenyl, glycidyl ether propyl, methacryloxy propyl, etc., preferably R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 is methyl or vinyl.

[0025] The low hydrogen-containing silicone oil is a conventional commercially available product, with a hydrogen content of 0.05 - 0.75%, preferably 0.1 - 0.35%, and its structural formula is:

[0026] The terminal hydrogen-containing silicone oil is a conventional commercially available product, with a hydrogen content of 0.02 - 0.15%, preferably 0.05 - 0.12%, and its structural formula is:

[0027] The silicone paste is a conventional commercially available silicone paste and can be selected and added according to product requirements.

[0028] The platinum content of the Karstedt catalyst is 1000 - 20000 ppm, preferably 1000 - 5000 ppm.

[0029] The inhibitor is an alkynol inhibitor, commonly methyl butynol, ethynyl cyclohexanol, siloxane-modified alkynol, etc. One can be selected for use or multiple can be compounded for use according to factors such as application requirements and usage environment.

[0030] The present invention also provides a method for preparing a low-viscosity two-component addition-curing silicone gel, including the following steps: (1) Preparation of component A: Put vinyl silicone oil, mono-terminal vinyl silicone oil, POSS-modified vinyl silicone oil, branched vinyl silicone oil, and silicone paste into a stirring device, mix evenly under the condition of -0.1 MPa, then add the Karstedt catalyst, stir at normal pressure for 10 min, and continue to mix evenly under the condition of -0.1 MPa, and then filter and package to obtain the component A;

[0031] (2) Preparation of Component B: Put vinyl silicone oil, mono-terminal vinyl silicone oil, POSS-modified vinyl silicone oil, branched-chain vinyl silicone oil, and low hydrogen content silicone oil into a stirring device, mix evenly under the condition of -0.1 MPa, then add terminal hydrogen-containing silicone oil and inhibitor, stir at normal pressure for 15 minutes, and continue to mix evenly under the condition of -0.1 MPa, and then filter and package to obtain the Component B;

[0032] The density of the Component A and Component B is 0.9 - 1.15 g / cm 3 , and the viscosity of Component A and Component B is 100 - 1000 mPa·s.

[0033] When using the low-viscosity two-component addition-curing silicone gel, if manual gluing is adopted, the Component A and Component B can be accurately weighed in a weight ratio of 1:1 in sequence, mixed evenly and degassed before use; if semi-automatic / automated gluing is adopted, a pneumatic dispensing machine can be used for continuous gluing. Due to the low viscosity of the product of the present invention, its defoaming property is excellent. For small-area gluing scenarios, it can also be directly used after mixing without additional defoaming operation.

[0034] Compared with the prior art, the low-viscosity two-component addition-curing silicone gel provided by the present invention has the following advantages: (1) In the present invention, vinyl silicone oil, mono-terminal vinyl silicone oil, POSS-modified vinyl silicone oil, branched-chain vinyl silicone oil, low hydrogen content silicone oil and terminal hydrogen-containing silicone oil are used to prepare the two-component addition-curing silicone gel. Through reasonable proportioning of each component, the viscosity of the obtained product is relatively low, generally 100 - 1000 mPa·s, and it has excellent workability; the main component of this product is 100% active ingredient, without non-active raw materials, and has excellent oil separation resistance; this product uses special reactive silicone oils such as mono-terminal vinyl silicone oil, POSS-modified vinyl silicone oil, and branched-chain vinyl silicone oil, and through reasonable proportioning, it can balance high strength and flexibility and has excellent thermal stability, so it is applicable to various relatively harsh usage environments; this product has high transparency, can be used for encapsulation of optical equipment and is also convenient for detection and troubleshooting during later use; this product has a low penetration and stable penetration, especially after heat aging or thermal shock test, the change in penetration is small, and it has good reparability and self-healing property, which is convenient for later repair and restoration. The two-component addition-curing silicone gel provided by the present invention has the characteristics of low viscosity, good permeability, resistance to thermal shock, stable penetration, and good self-healing property, and can be used for potting protection of various electronic components, PCBs, IGBTs, etc.

[0035] (2) In the present invention, single-end vinyl silicone oil is selected. Its molecular structure contains vinyl groups, which have reactive activity and can undergo hydrosilylation reactions with other raw materials. Moreover, the vinyl content in the single-end vinyl silicone oil is relatively low. Therefore, when the single-end vinyl silicone oil is used in the silicone gel, the crosslinking density is also relatively low. While improving the flexibility of the silicone gel product itself, it will not cause a significant increase in the viscosity of the silicone gel product, nor will problems such as precipitation and migration occur during subsequent use.

[0036] (3) In the present invention, branched-chain vinyl silicone oil is selected and used in combination with POSS-modified vinyl silicone oil. By utilizing the multiple reaction crosslinking points provided by the two vinyl silicone oils with special structures, the crosslinking degree of the silicone gel is increased, thereby greatly improving the strength, elongation at break, and heat resistance of the silicone gel product. At the same time, excellent heat resistance, stability of cone penetration (hardness), and flexibility can be obtained. Detailed implementation manners

[0037] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with embodiments.

[0038] The raw materials used in the following examples and comparative examples are as follows:

[0039] Vinyl silicone oil - 1# has a viscosity of 500 mPa·s; vinyl silicone oil - 2# has a viscosity of 350 mPa·s;

[0040] Single-end vinyl silicone oil - 1# has a viscosity of 100 mPa·s; single-end vinyl silicone oil - 2# has a viscosity of 50 mPa·s;

[0041] POSS-modified vinyl silicone oil 2 - 1# has a viscosity of 300 mPa·s; POSS-modified vinyl silicone oil 2 - 2# has a viscosity of 100 mPa·s;

[0042] Branched-chain vinyl silicone oil 2 - 1# has a viscosity of 350 mPa·s; branched-chain vinyl silicone oil 2 - 2# has a viscosity of 100 mPa·s;

[0043] The silicone color paste is a commercially available silicone blue paste;

[0044] The platinum concentration of the Karstedt catalyst is 3000 ppm;

[0045] The hydrogen content of low-hydrogen silicone oil - 1# and low-hydrogen silicone oil - 2# is 0.1% and 0.18% respectively;

[0046] The hydrogen content of the end-hydrogen silicone oil is 0.09%;

[0047] Inhibitor - 1# is ethynylcyclohexanol (content 99.8%); inhibitor - 2# is methylbutynol (content 99.8%).

[0048] The viscosity of methyl silicone oil is 100 mPa·s;

[0049] The viscosity of vinyl MQ silicone resin is 2000 mPa·s (MQ resin content 65%);

[0050] The hydrophobic fumed silica is Evonik TS720.

[0051] The preparation method of the low-viscosity two-component addition-curing silicone gel in the following examples comprises the following steps: (1) Preparation of component A: Put vinyl silicone oil, mono-terminal vinyl silicone oil, POSS-modified vinyl silicone oil, branched-chain vinyl silicone oil, and silicone color paste into a stirring device, mix evenly under the condition of -0.1 MPa, then put in the Kester catalyst, stir at normal pressure for 10 min, and continue to mix evenly under the condition of -0.1 MPa, and then filter and package to obtain the component A;

[0052] (2) Preparation of component B: Put vinyl silicone oil, mono-terminal vinyl silicone oil, POSS-modified vinyl silicone oil, branched-chain vinyl silicone oil, and low-hydrogen-content silicone oil into a stirring device, mix evenly under the condition of -0.1 MPa, then put in terminal hydrogen-containing silicone oil and inhibitor, stir at normal pressure for 15 min, and continue to mix evenly under the condition of -0.1 MPa, and then filter and package to obtain the component B;

[0053] Example 1

[0054] According to the following table's ratio, prepare component A and component B respectively. The viscosity of the prepared component A is 342 mPa·s, which is a colorless, transparent and viscous liquid; the viscosity of component B is 351 mPa·s, which is a colorless, transparent and viscous liquid. After mixing the glue according to the weight ratio of 1:1, at 25 °C, the operation time is 180 min, and the complete curing time at 120 °C is 20 min.

[0055]

[0056] After taking the above component A and component B to mix the glue, prepare test specimens according to the test standards ASTM D-2240, ASTM-D412, and ASTM-D624, and conduct tests after curing at 25 °C for 24 h. The measured data are as follows: the hardness is Shore OO, 20 degrees, the tensile strength is 235 psi, the 100% modulus is 11 psi, the elongation at break is 874%, and the tear strength of die B is 35 pli.

[0057] Example 2

[0058] According to the following table's ratio, prepare component A and component B respectively.

[0059]

[0060] The viscosity of the prepared Component A is 190 mPa·s, and it is a blue transparent viscous liquid; the viscosity of Component B is 185 mPa·s, and it is a colorless transparent viscous liquid. After mixing the two components according to a weight ratio of 1:1, at 25 °C, the working time is 60 min, and the complete curing time at 120 °C is 15 min.

[0061] After taking the above-mentioned Component A and Component B and mixing them, according to the test standards ASTM D-2240, ASTM-D412, and ASTM-D624, test specimens were prepared and tested after curing at 25 °C for 24 h. The measured data are as follows: the hardness is Shore OO, 50 degrees, the tensile strength is 330 psi, the 100% modulus is 12.3 psi, the elongation at break is 650%, and the tear strength of Die B is 52 pli.

[0062] Examples 3-5

[0063] According to the ratios in the following table, Component A and Component B of Examples 3-5 were prepared respectively.

[0064]

[0065] After taking the Component A and Component B in Examples 3-5 and mixing them, according to the test standards ASTM D-2240, ASTM-D412, and ASTM-D624, test specimens were prepared and tested after curing at 25 °C for 24 h. The measured data are as follows:

[0066]

[0067] Comparative Examples 1-2

[0068] According to the ratios in the following table, Component A and Component B of Comparative Example 1 and Comparative Example 2 were prepared respectively, and were labeled as Comparative Sample A-1, Comparative Sample B-1, Comparative Sample A-2, and Comparative Sample B-2.

[0069]

[0070] The viscosity of the Component A prepared in Comparative Example 1 is 753 mPa·s, and it is a colorless transparent viscous liquid; the viscosity of Component B is 731 mPa·s, and it is a colorless transparent viscous liquid. After mixing the two components according to a weight ratio of 1:1, at 25 °C, the working time is 170 min, and the complete curing time at 120 °C is 15 min. After taking the Component A and Component B in Comparative Example 1 and mixing them, according to the test standards ASTM D-2240, ASTM-D412, and ASTM-D624, test specimens were prepared and tested after curing at 25 °C for 24 h. The measured data are as follows: the hardness is Shore OO, 45 degrees, the tensile strength is 145 psi, the 100% modulus is 7 psi, the elongation at break is 320%, and the tear strength of Die B is 16 pli.

[0071] The viscosity of the A component prepared in Comparative Example 2 was 420 mPa·s, which was a blue transparent viscous liquid; the viscosity of the B component was 467 mPa·s, which was a colorless transparent viscous liquid. After mixing the glue in a weight ratio of 1:1, at 25 °C, the operation time was 55 min, and the complete curing time at 120 °C was 16 min. After taking the A and B components in Comparative Example 2 and mixing the glue, according to the test standards ASTM D-2240, ASTM-D412, and ASTM-D624, test specimens were prepared and tested after curing at 25 °C for 24 h. The measured data were as follows: the hardness was Shore OO, 85 degrees, the tensile strength was 185 psi, the 100% modulus was 7.6 psi, the elongation at break was 263%, and the tear strength of Die B was 29 pli.

[0072] Comparing Examples 1-2 and Comparative Examples 1-2, it can be seen that if conventional silicone oil materials are used, the viscosities of the components of the silicone gel are generally on the high side, and a large amount of non-reactive silicone oil (such as methyl silicone oil) needs to be used for dilution to achieve the purpose of reducing the crosslinking degree, and it is difficult to achieve a relatively balanced state between its strength and flexibility. However, in this application, using monovinyl silicone oil, POSS-modified vinyl silicone oil, and branched vinyl silicone oil can ensure both low viscosity and high strength and flexibility of the silicone gel.

[0073] The above Examples 1-2 and Comparative Examples 1-2 were respectively made into test specimens, and 150 °C storage aging tests, double 85 tests, and red ink tests were carried out. The red ink test was as follows: the specimens were placed in a mixed solution of red ink and ethanol with a volume ratio of 1:1 for boiling test, and samples were taken and observed every 0.5 h to observe the heat resistance and sealing performance of the specimens.

[0074] The results of the 150 °C storage aging test are shown in the following table:

[0075]

[0076] The results of the double 85 test (under the conditions of a temperature of 85 °C and a humidity of 85%) are shown in the following table:

[0077]

[0078] The results of the red ink test are shown in the following table:

[0079]

[0080] From the above test results, it can be seen that the two-component silicone gel products prepared using conventional materials and formulation schemes have poor heat resistance, significant performance attenuation, a significant increase in hardness, and there is also a risk of oil separation during long-term use, and the sealing effectiveness is also unstable. The low-viscosity two-component addition-curing silicone gel prepared by the present invention performs excellently in the above tests, with its performance maintained above 90%, and no oil separation, transparency decrease, hardness increase, etc. problems occur during long-term testing.

[0081] Comparative Example 3-4

[0082] According to the formulations in the following table, prepare the A and B components of Comparative Example 3 and Comparative Example 4 respectively, and label them as Comparative Sample A-3, Comparative Sample B-3, Comparative Sample A-4, and Comparative Sample B-4.

[0083]

[0084] The viscosity of the A component prepared in Comparative Example 3 is 327 mPa·s, which is a colorless, transparent and viscous liquid; the viscosity of the B component is 319 mPa·s, which is a colorless, transparent and viscous liquid. After mixing the glue in a weight ratio of 1:1, at 25 °C, the working time is 176 min, and the complete curing time at 120 °C is 16 min.

[0085] After taking the A and B components of Comparative Example 3 and mixing the glue, prepare test specimens according to the test standards ASTM D-2240, ASTM-D412, and ASTM-D624, and conduct tests after curing at 25 °C for 24 h. The measured data are as follows: the hardness is Shore OO, 55 degrees, the tensile strength is 244 psi, the 100% modulus is 10 psi, the elongation at break is 520%, and the tear strength of Die B is 33 pli.

[0086] The viscosity of the A component prepared in Comparative Example 4 is 373 mPa·s, which is a colorless, transparent and viscous liquid; the viscosity of the B component is 366 mPa·s, which is a colorless, transparent and viscous liquid. After mixing the glue in a weight ratio of 1:1, at 25 °C, the working time is 183 min, and the complete curing time at 120 °C is 15.5 min.

[0087] After taking the A and B components of Comparative Example 4 and mixing the glue, prepare test specimens according to the test standards ASTM D-2240, ASTM-D412, and ASTM-D624, and conduct tests after curing at 25 °C for 24 h. The measured data are as follows: the hardness is Shore OO, 21 degrees, the tensile strength is 145 psi, the 100% modulus is 7.7 psi, the elongation at break is 678%, and the tear strength of Die B is 22 pli.

[0088] Comparing Example 1 with Comparative Examples 3-4, it can be seen that if only POSS-modified vinyl silicone oil is used, the hardness is significantly higher, the elongation at break decreases significantly, and other data are relatively stable; if only branched-chain vinyl silicone oil is used, its initial hardness is relatively stable, but its tensile strength and tear strength decrease significantly.

[0089] The above Example 1 and Comparative Examples 3-4 were respectively cured to make test specimens, and were respectively subjected to a storage aging test at 150 °C, a double 85 test, a red ink test, and a high and low temperature shock test. The high and low temperature shock test was: -40 °C / 0.5 h, 150 °C / 0.5 h, and the temperature rise and fall time was 0.5 h each, that is, 2 h was one cycle, and the test was carried out for 500 cycles.

[0090] The results of the storage aging test at 150 °C are shown in the following table:

[0091]

[0092] The results of the double 85 test are shown in the following table:

[0093]

[0094] The results of the red ink test are shown in the following table:

[0095]

[0096] The results of the high and low temperature shock test are as follows. The pass rate of the encapsulated specimens was obtained by potting and testing the products of the present invention on electronic components:

[0097]

[0098] From the above test data, it can be seen that the two-component silicone gel products prepared by using only POSS-modified vinyl silicone oil or branched-chain vinyl silicone oil have poor heat resistance, obvious performance attenuation, and obvious hardness increase. From the results of the high and low temperature shock test, it can be seen that when only POSS-modified vinyl silicone oil is used, the elongation at break is generally low, the resilience, repairability and seismic resistance of the product decrease significantly, the hardness climbs significantly, and the internal stress increases too much, resulting in a high breakage rate of the internal gold wires of the encapsulated specimens, causing damage to the components and a great decrease in the pass rate; when using a single branched-chain vinyl silicone oil, the temperature resistance and thermal shock resistance of the product decrease significantly, the cone penetration decreases severely after the product aging test, and the elasticity decreases greatly, so the seismic resistance is lost, and the strength decreases significantly, and the adhesiveness attenuates greatly, resulting in local peeling. The two-component addition-cured silicone gel product provided by the present application shows excellent performance in the above tests, its performance is maintained above 90-95%, and there are no problems such as hardness climbing and significant increase in internal stress during long-term testing.

Claims

1. A low viscosity two-component addition type silicone gel, Features: The low-viscosity two-component addition-type silicone gel consists of component A and component B, wherein the components and mass fractions of component A are as follows: Vinyl silicone oil 10-75 Single-ended vinyl silicone oil 10-35 Poss modified vinyl silicone oil 10-35 Branched vinyl silicone oil 10-35 Silicone color paste 0-2 Custer catalyst 0.0001-1 The components and mass fractions in the B component are: Vinyl silicone oil 10-75 Single-ended vinyl silicone oil 10-35 Poss modified vinyl silicone oil 10-35 Branched vinyl silicone oil 10-35 Low hydrogen silicone oil 1-10 End hydrogen silicone oil 2-20 Inhibitor 0.001-1 The component A and the component B are mixed in a weight ratio of 1:1; The structural formula of the vinyl silicone oil is as follows: ; The hydrogen content of the low hydrogen silicone oil is 0.05-0.75%, and its structural formula is: 。 2. The low-viscosity two-component addition-type silicone gel according to claim 1, Features: The viscosity of the vinyl silicone oil is 50-5000 mPa·s.

3. The low-viscosity two-component addition-type silicone gel according to claim 1, Features: The viscosity of the single-end vinyl silicone oil is 20-1000 mPa·s, and its structural formula is: .

4. The low-viscosity two-component addition-type silicone gel according to claim 1, Features: The viscosity of the POSS-modified vinyl silicone oil is 100 - 10,000 mPa·s, and its structural formula is: or ; where .

5. The low-viscosity two-component addition-type silicone gel according to claim 4, Features: The structural formula of the POSS-modified vinyl silicone oil is , where .

6. The low-viscosity two-component addition-type silicone gel according to claim 4, Features: The POSS modified vinyl silicone oil is obtained by the balanced reaction and refining of POSS monomer cage-type octavinyl polysilsesquioxane or octapolytetramethylammonium silicate, D3 / D4 / D5, vinyl double caps and a catalyst.

7. The low-viscosity two-component addition-type silicone gel according to claim 1, Features: The viscosity of the branched vinyl silicone oil is 50-1000 mPa·s, and its structure is: or ； wherein R 1 is vinyl, and R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 is one or a combination of more than one of methyl, ethyl, vinyl, propyl, chloropropyl, phenyl, glycidyl ether propyl, and methacryloxy propyl.

8. The low-viscosity two-component addition-type silicone gel according to claim 1, Features: The hydrogen content of the terminal hydrogen-containing silicone oil is 0.02-0.15%, and its structural formula is: .

9. The low-viscosity two-component addition-type silicone gel according to claim 1, Features: The platinum content of the Castel catalyst is 1000-20000ppm; and the inhibitor is an acetylene alcohol inhibitor.

10. A method for preparing the low-viscosity two-component addition-type silicone gel according to claim 1, Features The following steps are involved: (1) Preparation of component A: vinyl silicone oil, single-end vinyl silicone oil, poss-modified vinyl silicone oil, branched vinyl silicone oil, and optional silicone color paste are placed in a stirring device, mixed evenly at -0.1 MPa, and then a Custer catalyst is added. After stirring at normal pressure for 10 minutes, the mixture is further mixed evenly at -0.1 MPa, and the component A is obtained by filtering and packaging. (2)Preparation of Component B: Put vinyl silicone oil, mono-terminal vinyl silicone oil, POSS-modified vinyl silicone oil, branched vinyl silicone oil, and low hydrogen content silicone oil into a stirring device, mix evenly under the condition of -0.1 MPa, then add terminal hydrogen-containing silicone oil and inhibitor, stir at normal pressure for 15 minutes, and then continue to mix evenly under the condition of -0.1 MPa, and filter and package to obtain the Component B; The density of the A component and the B component is 0.9 - 1.15 g / cm 3 , and the viscosity of the A component and the B component is 100 - 1000 mPa·s.

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