CN110982077B - Modified tackifier, preparation method and application - Google Patents
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/38—Polysiloxanes modified by chemical after-treatment
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/04—Polysiloxanes
- C08G77/20—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J183/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Adhesives based on derivatives of such polymers
- C09J183/04—Polysiloxanes
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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Abstract
The invention provides a modified tackifier, a preparation method and application thereof. The preparation method of the modified tackifier comprises the following steps: 1) reacting methyl trialkoxysilane and divinyl tetramethyl disiloxane under a catalytic condition, and adding a chain extender for reaction; then adding hydroxyl silicone oil for continuous reaction; 2) and mixing the product with a silane coupling agent containing acryloxy for reaction to prepare the modified tackifier. The invention enhances the compatibility of the tackifier and a pouring sealant system, avoids the problem of large pungent smell caused by the free state of acryloxy, and has the advantages of low VOC content and more environmental and human body friendliness; in addition, compared with the prior art, the modified tackifier of the invention also has the advantage of good tackifying effect.
Description
Technical Field
The invention relates to a tackifier, in particular to a modified tackifier, a preparation method and application, and belongs to the technical field of pouring sealants.
Background
Potting materials are diverse, but the majority that are currently used are various synthetic polymers. Among them, epoxy resin, polyurethane elastomer and silicone polymer are most widely used.
The organic silicon pouring sealant consists of silicon resin, a cross-linking agent, a catalyst, an auxiliary agent (such as a tackifier) and the like. The silicone rubber pouring sealant can be divided into room temperature vulcanized silicone rubber according to the molecular structure and the crosslinking method; the single/double-component addition type silicone rubber pouring sealant; two-component condensed silicone rubber pouring sealant.
The single/double-component addition type silicone rubber pouring sealant is used for improving the adhesive property of the single/double-component addition type silicone rubber pouring sealant by adding an organic matter containing an acryloyloxy group in the preparation process, for example, the patent application with the publication number of CN109401669A discloses an addition type liquid silicone rubber tackifier which is a silicon-hydrogen-containing group and acryloyloxy siloxane oligomer, and the problem that the existing addition type liquid silicone rubber has poor adhesive capacity to a base material at a medium and low temperature is solved.
The modified tackifier has certain bonding force improvement effect on a base material, but has certain limitation, and the problems that the acryloyl oxygen group is still in a free state, so that unpleasant pungent smell is easily generated, the compatibility with a pouring sealant is poor, and the modified tackifier is easy to turn turbid are easily caused, so the modified tackifier is produced in order to improve the current situation and ensure that the product is more friendly to human beings.
Disclosure of Invention
The invention provides a modified tackifier, a preparation method and application, aiming at the problems of poor compatibility, easy volatilization, pungent smell and the like of the existing acryloyl oxygen group tackifier in addition type pouring sealant. The modified tackifier prepared by the method can play a good role in tackifying when added into the pouring sealant, has good compatibility with an organic silicon system, low VOC content and no pungent smell, and is simple in preparation method and easy to operate.
In order to achieve the purpose, the invention provides a modified tackifier, a preparation method and application.
A modified tackifier has a structural general formula shown in formula I:
wherein m is 20-30, and is derived from hydroxyl silicone oil by the following preparation method; n is1＝10～20，n2＝10～20，n310 to 20, preferably n1＝n2＝n3Prepared by the following method, n1、n2、n3Are all derived from chain extenders; the X group represents:
a preparation method of a modified tackifier comprises the following steps:
1) reacting methyl trialkoxysilane and divinyl tetramethyl disiloxane for 0.5-6 h under a catalytic condition, and then adding a chain extender for reacting for 1-3 h; then adding hydroxyl silicone oil, and continuing to react for 1-3 hours to prepare hydroxyl vinyl branched silicone oil; preferably, the temperature of the reaction system is 50-80 ℃;
2) and mixing the product with a silane coupling agent containing acryloxy for reaction to prepare the modified tackifier.
Further, the addition amount of each raw material in the step 1) is as follows by mass parts:
14-22 parts of methyltrialkoxysilane;
10-20 parts of divinyl tetramethyl disiloxane;
0.002-0.006 parts of catalyst;
222-444 parts of a chain extender;
148-222 parts of hydroxyl silicone oil.
Further, the methyltrialkoxysilane in the step 1) is at least one of methyltrimethoxysilane, methyltriethoxysilane and methyltripropoxysilane, preferably methyltrimethoxysilane.
Further, the polymerization degree of the hydroxyl silicone oil in the step 1) is 200-300;
preferably, the chain extender in step 1) is one or two of D4 (octamethylcyclotetrasiloxane) and DMC (dimethylcyclosiloxane mixture), preferably D4.
Further, the catalyst used in step 1) and step 2) is selected from the group consisting of trifluoromethanesulfonic acid, trifluoroacetic acid, sulfonic acid resin and sulfuric acid, preferably trifluoromethanesulfonic acid.
Further, the addition amounts of the raw materials in the step 2) are respectively as follows by mass parts:
650 parts of hydroxyl vinyl branched silicone oil 350-5;
20-24 parts of an acryloyloxy silane coupling agent;
0.002-0.006 parts of catalyst.
Further, the silane coupling agent containing acryloxy group in the step 2) is at least one of acryloxypropyltrimethoxysilane, methacryloxypropyltrimethoxysilane and methacryloxypropyldimethylmethoxysilane, and the acryloxypropyltrimethoxysilane is preferred.
Further, the reaction temperature in the step 2) is 50-80 ℃, and the reaction time is 1-5 hours.
The modified tackifier and the modified tackifier prepared by the method are characterized in that the tackifier is used for preparing addition type organic silicon pouring sealant.
According to the invention, active double bonds are introduced at two molecular ends while maintaining acryloxy groups in a molecular structure, so that the modified tackifier can be grafted in a pouring sealant molecular system through a crosslinking reaction when being used for preparing an addition type pouring sealant, thereby enhancing the compatibility with the pouring sealant system on one hand, enabling the two to be clear and transparent and not turbid when being mixed with each other, and avoiding the problem of large pungent smell caused by the fact that acryloxy groups are in a free state on the other hand, and the modified tackifier has the advantages of low VOC content and being more friendly to the environment and human body; in addition, compared with the prior art, the modified tackifier of the invention also has the advantage of good tackifying effect, and is better than that of directly adding an acryloyloxy silane coupling agent into a pouring sealant.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be illustrative of the invention and are not to be construed as limiting the scope of the invention.
The analytical test method and the raw material sources adopted by the invention comprise:
1. the hydroxyl content of the product is determined by infrared IR: weighing a sample by using an electronic balance, adding a solvent into an instrument to measure the absorbance, then selecting-spectrum analysis-quantitative setting, selecting a standard curve, and selecting quantitative analysis to test the content of the silicon hydroxyl. The analysis result is directly read (w) after being calculated by software, and the content of the silicon hydroxyl in the sample is calculated according to the following formula. W% (. W × m2/m1 × 10000),
in the formula: w%: the percentage of silicon hydroxyl groups in the sample, percent
w: instrument software calculation result, mg/kg
m 2: total weight of sample plus solvent, g
m 1: sample mass, g
2. Testing the VOC content: GB/T2793-1995.
3. Testing the bonding strength: GB/T7124-
4. The raw material sources are as follows:
methyltrimethoxysilane, caruncle cheng optical chemical ltd, AR;
methyltriethoxysilane, caruncle cheng optical chemical ltd, AR;
methyltripropoxysilane, caruncle chenopodium chemical ltd, AR;
divinyltetramethyldisiloxane, caruncle cheng optical chemicals, inc, AR;
d4, caruncle cheng optical chemical ltd, AR;
DMC, caruncle cheng chemicals ltd, AR;
hydroxy silicone oil, Dayi chemical Co., Ltd, AR;
trifluoromethanesulfonic acid, alatin reagent, ltd, AR;
trifluoroacetic acid, alatin reagent, ltd, AR;
sulfonic acid resins, alatin reagent ltd, AR;
sulfuric acid, cromion chemical agents ltd, AR;
acryloxypropyltrimethoxysilane, Aladdin reagent, Inc., AR;
methacryloxypropyl trimethoxysilane, alatin reagent ltd, AR;
methacryloxypropyl dimethylmethoxysilane, alatin reagent limited, AR;
vinyl silicone oil, Zhejiang orange Ltd, AR;
hydrogen-containing silicone oil, Zhejiang Kaiser New Material Co., Ltd., type 202;
1, 1-diphenyl-2-propyn-1-ol, alatin reagent ltd, AR;
MQ resin, jiang west new exemplary limited, AR;
fumed silica, winning moraxel limited, model R972;
surfactant FS-60, DuPont, AR;
alumina filler, Guangdong ultra-new material science and technology limited, particle size 10-30 um;
kaster catalyst, Shenzhen Yongsheng New Material Co., model number pt-5000.
Other raw materials and reagents may be purchased from commercial sources unless otherwise specified.
[ example 1 ]
(1) Synthesizing hydroxyl vinyl branched silicone oil: equipped with a stirrer, a thermometer, a condenser and N214g of methyltrimethoxysilane and 19g of divinyl tetramethyl disiloxane are added into a three-neck flask with the atmosphere, stirring is started, the stirring speed is controlled to be 400r/min, after the temperature is raised to 70 ℃, 0.003g of trifluoromethanesulfonic acid is added dropwise, and the reaction is carried out for 3 hours. Then adding 222g D4 for reaction for 2h, then adding 148g of hydroxyl silicone oil for reaction for 2h, then closing the heating and stirring system, cooling to room temperature, and then carrying out adsorption filtration and rotary evaporation on the mixture to obtain the hydroxyl vinyl branched silicone oil.
The product hydroxyl content was 0.46% as determined by infrared IR on the product, similar to the theoretical silicon hydroxyl content of 0.45%.
(2) Synthesizing an organic silicon modified tackifier: to a three-necked flask equipped with a stirrer, a thermometer, a condenser and an atmosphere of N2 were added 350g of hydroxy vinyl branched silicone oil and 24g of methacryloxypropyl trimethoxysilane. Stirring is started, the stirring speed is controlled to be 200r/min, then the temperature is raised to 70 ℃, 0.003g of trifluoromethyl sulfonic acid is added, and then the reaction is carried out for 3h at 70 ℃. And then closing the heating and stirring system, cooling to room temperature, and then carrying out adsorption filtration and rotary evaporation on the mixture to obtain the organic silicon modified tackifier.
The hydroxyl content of the product is determined by infrared IR to be less than 100ppm, which indicates that the hydroxyl vinyl branched silicone oil and the acryloxy silane coupling agent are completely reacted.
[ example 2 ]
(1) Synthesizing hydroxyl vinyl branched silicone oil: 18g of methyltriethoxysilane and 10g of divinyltetramethyldisiloxane are added into a three-neck flask equipped with a stirrer, a thermometer, a condenser and an atmosphere of N2, stirring is started, the stirring speed is controlled at 400r/min, after the temperature is raised to 50 ℃, 0.005g of trifluoroacetic acid is added dropwise, and the reaction is carried out for 0.5 h. And then adding 444g of DMC for reaction for 1h, then adding 222g of hydroxyl silicone oil for reaction for 1h, then closing the heating and stirring system, cooling to room temperature, and then carrying out adsorption filtration and rotary evaporation on the mixture to obtain hydroxyl vinyl branched silicone oil.
The product hydroxyl content was 0.26% as determined by infrared IR on the product, similar to the theoretical silicon hydroxyl content of 0.24%.
(2) Synthesizing an organic silicon modified tackifier: into a three-necked flask equipped with a stirrer, a thermometer, a condenser and an atmosphere of N2 were charged 650g of a hydroxyvinyl-branched silicone oil and 23g of acryloxypropyltrimethoxysilane. Stirring is started, the stirring speed is controlled to be 200r/min, then the temperature is increased to 80 ℃, 0.005g of trifluoroacetic acid is added, and then the reaction is carried out for 1h at 80 ℃. And then closing the heating and stirring system, cooling to room temperature, and then carrying out adsorption filtration and rotary evaporation on the mixture to obtain the organic silicon modified tackifier.
The hydroxyl content of the product is determined by infrared IR to be less than 100ppm, which indicates that the hydroxyl vinyl branched silicone oil and the acryloxy silane coupling agent are completely reacted.
[ example 3 ]
(1) Synthesizing hydroxyl vinyl branched silicone oil: 22g of methyl tripropoxysilane and 20g of divinyl tetramethyl disiloxane are added into a three-neck flask with a stirrer, a thermometer, a condenser and an N2 atmosphere, stirring is started, the stirring speed is controlled to be 400r/min, after the temperature is raised to 60 ℃, 0.002g of sulfonic acid resin is added dropwise, and the reaction is carried out for 6 hours. And adding 333g D4 for reaction for 3 hours, adding 185g of hydroxyl silicone oil for reaction for 2 hours, closing the heating and stirring system, cooling to room temperature, and performing adsorption filtration and rotary evaporation on the mixture to obtain the hydroxyl vinyl branched silicone oil.
The product hydroxyl content was 0.31% as determined by infrared IR on the product, similar to the theoretical silicon hydroxyl content of 0.31%.
(2) Synthesizing an organic silicon modified tackifier: to a three-necked flask equipped with a stirrer, a thermometer, a condenser and an atmosphere of N2 were charged 500g of a hydroxy vinyl branched silicone oil and 20g of methacryloxypropyl dimethylmethoxysilane. Starting stirring, controlling the stirring speed at 200r/min, then heating to 60 ℃, adding 0.002g of sulfonic acid resin, and then reacting for 5 hours at 60 ℃. And then closing the heating and stirring system, cooling to room temperature, and then carrying out adsorption filtration and rotary evaporation on the mixture to obtain the organic silicon modified tackifier.
The hydroxyl content of the product is determined by infrared IR to be less than 100ppm, which indicates that the hydroxyl vinyl branched silicone oil and the acryloxy silane coupling agent are completely reacted.
[ example 4 ]
(1) Synthesizing hydroxyl vinyl branched silicone oil: 22g of methyltrimethoxysilane and 19g of divinyltetramethyldisiloxane were introduced into a three-necked flask equipped with a stirrer, a thermometer, a condenser and an atmosphere of N2, the stirring was started, the stirring speed was controlled at 400r/min, and after the temperature was raised to 70 ℃, 0.006g of sulfuric acid was added dropwise and reacted for 3 hours. And then adding 444g D4 for reaction for 2 hours, then adding 148g of hydroxyl silicone oil for reaction for 2 hours, then closing the heating and stirring system, cooling to room temperature, and then carrying out adsorption filtration and rotary evaporation on the mixture to obtain the hydroxyl vinyl branched silicone oil.
The product hydroxyl content was 0.27% as determined by infrared IR on the product, similar to the theoretical silicon hydroxyl content of 0.27%.
(2) Synthesizing an organic silicon modified tackifier: to a three-necked flask equipped with a stirrer, a thermometer, a condenser and an atmosphere of N2 were added 600g of hydroxy vinyl branched silicone oil and 24g of methacryloxypropyl trimethoxysilane. Stirring is started, the stirring speed is controlled to be 200r/min, then the temperature is raised to 50 ℃, 0.006g of sulfuric acid is added, and then the reaction is carried out for 3h at 50 ℃. And then closing the heating and stirring system, cooling to room temperature, and then carrying out adsorption filtration and rotary evaporation on the mixture to obtain the organic silicon modified tackifier.
The hydroxyl content of the product is determined by infrared IR to be less than 100ppm, which indicates that the hydroxyl vinyl branched silicone oil and the acryloxy silane coupling agent are completely reacted.
[ example 5 ]
(1) Synthesizing hydroxyl vinyl branched silicone oil: equipped with a stirrer, a thermometer, a condenser and N214g of methyltrimethoxysilane and 19g of divinyl tetramethyl disiloxane are added into a three-neck flask with the atmosphere, stirring is started, the stirring speed is controlled to be 400r/min, after the temperature is raised to 70 ℃, 0.003g of trifluoromethanesulfonic acid is added dropwise, and the reaction is carried out for 3 hours. Then adding 222g D4 for reaction for 2h, then adding 148g of hydroxyl silicone oil for reaction for 2h, then closing the heating and stirring system, cooling to room temperature, and then carrying out adsorption filtration and rotary evaporation on the mixture to obtain the hydroxyl vinyl branched silicone oil.
The product hydroxyl content was 0.46% as determined by infrared IR on the product, similar to the theoretical silicon hydroxyl content of 0.45%.
(2) Synthesizing an organic silicon modified tackifier: to a three-necked flask equipped with a stirrer, a thermometer, a condenser and an atmosphere of N2 were added 350g of hydroxy vinyl branched silicone oil and 23g of acryloxypropyl trimethoxysilane. Stirring is started, the stirring speed is controlled to be 200r/min, then the temperature is raised to 70 ℃, 0.003g of trifluoromethyl sulfonic acid is added, and then the reaction is carried out for 3h at 70 ℃. And then closing the heating and stirring system, cooling to room temperature, and then carrying out adsorption filtration and rotary evaporation on the mixture to obtain the organic silicon modified tackifier.
The hydroxyl content of the product is determined by infrared IR to be less than 100ppm, which indicates that the hydroxyl vinyl branched silicone oil and the acryloxy silane coupling agent are completely reacted.
The adhesion performance and VOC content of the comparative examples and each example after being added into the pouring sealant are tested by taking a commercial unmodified acryloyloxypropyl trimethoxy silane coupling agent as a comparative tackifier, and the test results are shown in Table 1.
The specific preparation method of the pouring sealant comprises the following steps: adding 200g of vinyl silicone oil into 10g of a toluene solution of MQ resin, uniformly stirring, distilling under reduced pressure to remove low-boiling-point substances, sequentially adding 1g of tackifier, 10g of hydrogen-containing silicone oil, 10g of 1, 1-diphenyl-2-propyne-1-ol, 350g of alumina, 0.1g of Kaster catalyst, 2g of surfactant FS-60 and 2g of fumed silica, stirring at a high speed for 60min, and finally carrying out vacuum defoaming treatment under the pressure of 0.1MPa to obtain the pouring sealant product.
Table 1 encapsulation adhesion performance test for each example and comparative example preparation
| Example 1 | Example 2 | Example 3 | Example 4 | EXAMPLE 5 | Comparative example | |
| Adhesive strength/Mpa | 1.2 | 1.6 | 1.4 | 1.2 | 1.8 | 0.9 |
| VOC content/%) | <0.1 | <0.1 | <0.1 | <0.1 | <0.1 | >1％ |
As can be seen from Table 1, the tackifier modified by the method of the present invention not only reduced the VOC content but also enhanced the tackifying effect (examples 1-5, comparative examples); the acryloxypropyltrimethoxysilane adhesion promoter exhibited better adhesion promotion than methacryloxypropyltrimethoxysilane and methacryloxypropyldimethylmethoxysilane (examples 1 to 3).
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and additions can be made without departing from the method of the present invention, and these modifications and additions should also be regarded as the protection scope of the present invention.
Claims (17)
1. The modified tackifier is characterized in that the structural general formula of the tackifier is shown as formula I:
wherein m is 20 to 30, n1＝10～20，n2＝10～20，n310-20, the X group represents:
2. the modified tackifier of claim 1, wherein n is1＝n2＝n3。
3. A method of preparing the modified tackifier of claim 1, comprising the steps of:
1) reacting methyl trialkoxysilane and divinyl tetramethyl disiloxane for 0.5-6 h under a catalytic condition, and then adding a chain extender for reacting for 1-3 h; then adding hydroxyl silicone oil, and continuing to react for 1-3 hours to prepare hydroxyl vinyl branched silicone oil;
2) and mixing the product with a silane coupling agent containing acryloxy for reaction to prepare the modified tackifier.
4. The preparation method of the modified tackifier according to claim 3, wherein the temperature of the reaction system in the step 1) is 50-80 ℃.
5. The preparation method of the modified tackifier according to claim 3, wherein the addition amount of each raw material in the step 1) is as follows by mass parts:
14-22 parts of methyltrialkoxysilane;
10-20 parts of divinyl tetramethyl disiloxane;
0.002-0.006 parts of catalyst;
222-444 parts of a chain extender;
148-222 parts of hydroxyl silicone oil.
6. The method of claim 3 or 5, wherein the methyltrialkoxysilane in step 1) is at least one of methyltrimethoxysilane, methyltriethoxysilane, and methyltripropoxysilane.
7. The method of claim 6, wherein the methyltrialkoxysilane in step 1) is methyltrimethoxysilane.
8. The preparation method of the modified tackifier according to claim 6, wherein the degree of polymerization of the hydroxy silicone oil in the step 1) is 200 to 300.
9. The method for preparing the modified tackifier of claim 8, wherein the chain extender in the step 1) is one or two of D4 and DMC.
10. The method for preparing the modified tackifier of claim 9, wherein the chain extender in the step 1) is D4.
11. The preparation method of the modified tackifier according to any one of claims 3 to 5, wherein the catalysts used in the steps 1) and 2) are selected from trifluoromethanesulfonic acid, trifluoroacetic acid, sulfonic acid resin or sulfuric acid.
12. The method of claim 11, wherein the catalyst used in step 1) and step 2) is selected from the group consisting of trifluoromethanesulfonic acid.
13. The preparation method of the modified tackifier according to any one of claims 3 to 5, wherein the addition amount of each raw material in the step 2) is as follows in parts by mass:
650 parts of hydroxyl vinyl branched silicone oil 350-5;
20-24 parts of an acryloyloxy silane coupling agent;
0.002-0.006 parts of catalyst.
14. The method of claim 13, wherein the acryloxy-containing silane coupling agent in step 2) is at least one of acryloxypropyltrimethoxysilane, methacryloxypropyltrimethoxysilane, and methacryloxypropyldimethylmethoxysilane.
15. The method of claim 14, wherein the acryloxy-containing silane coupling agent of step 2) is acryloxypropyltrimethoxysilane.
16. The preparation method of the modified tackifier according to claim 14, wherein the reaction temperature in the step 2) is 50-80 ℃ and the reaction time is 1-5 hours.
17. A modified adhesion promoter as claimed in any one of claims 1 to 2 or prepared by a process as claimed in any one of claims 3 to 16 for the preparation of an addition silicone potting adhesive.
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