Process for the preparation of a high-vinyl liquid polybutadiene and its use

Abstract

This invention relates to the field of liquid polybutadiene technology, and particularly to a method for preparing high-vinyl liquid polybutadiene and its application. The method includes the following steps: adding a non-polar hydrocarbon solvent and butadiene monomer to a polymerization reactor, mixing them uniformly to obtain a butadiene monomer mixed solution; sequentially adding a structure-modifying component and an initiating component to the butadiene monomer mixed solution to initiate a polymerization reaction; after the polymerization reaction is completed, releasing the gel, and removing the solvent, organolithium initiator, and composite structure modifier from the gel to obtain the high-vinyl liquid polybutadiene product. This invention achieves the preparation of high-vinyl liquid polybutadiene with an ultra-low number-average molecular weight, while simultaneously possessing a high vinyl content and a narrow molecular weight distribution index, meeting the requirements for low-loss, high-frequency, and high-speed copper-clad laminate matrix materials, thus enabling better application in the field of low-loss, high-frequency, and high-speed copper-clad laminates.

Description

Technical fields:

[0001] This invention relates to the field of liquid polybutadiene technology, and particularly to a method for preparing high-vinyl liquid polybutadiene and its application. Background technology:

[0002] Liquid polybutadiene is a viscous, flowable liquid with a relative molecular mass below 10,000, and is a promising new synthetic material. Among various liquid rubbers, vinyl polybutadiene liquid rubber, with vinyl side groups on its molecular backbone, possesses advantages such as good anti-slip properties, aging resistance, and low heat generation, and is therefore also used in the manufacture of aircraft and automobile tires. Furthermore, it has wide applications in many fields such as plastics, coatings, adhesives, and functional polymers. According to its microstructure, liquid polybutadiene can be classified into 1,4-addition (cis and trans isomers) and 1,2-addition products. Among the 1,2-addition products, based on the vinyl content, it can be further divided into low-vinyl liquid polybutadiene (vinyl content < 30 wt%), medium-vinyl liquid polybutadiene (vinyl content 30-65 wt%), and high-vinyl liquid polybutadiene (vinyl content > 65 wt%). High-vinyl liquid rubber exhibits good low dielectric and low loss properties due to its extremely low molecular polarity, making it an important substrate for high-frequency and high-speed copper-clad laminates with extremely low / ultra-low loss ratings.

[0003] The booming development of industries such as 5G communication technology, the Internet of Things, and new energy vehicles has driven the copper clad laminate (CCL) industry to transform and upgrade towards high frequency and high speed. CCL is the base material for printed circuit boards, mainly consisting of three parts: matrix resin, reinforcing material, and copper foil. It is typically produced by impregnating the reinforcing material with resin, drying it to form a prepreg, then stacking one or more prepregs together, covering one or both sides with copper foil, and hot-pressing at high temperature to form a plate-like material. The matrix resin, with its excellent dielectric properties, low dielectric constant, and low dielectric loss, plays a direct role in determining the dielectric performance of CCL. Commonly used resin matrices for high-frequency CCL include epoxy resin, polytetrafluoroethylene resin, cyanate ester resin, polyphenylene ether, and polyhydrocarbon resin. Hydrocarbon resin, being a non-polar or low-polar polymer with a highly symmetrical structure and a simple variety of polar functional groups, possesses excellent dielectric properties and is a promising high-frequency matrix resin. Polybutadiene liquid rubber is already an important matrix resin in high-frequency, high-speed copper-clad laminates. The type and amount of initiators and structure modifiers used in polymer synthesis can alter the microstructure of polybutadiene, ultimately affecting its properties. Because high-vinyl liquid polybutadiene is amorphous, it possesses high tensile strength and low hysteresis, resulting in a low dielectric constant. Temperature and frequency changes have minimal impact on its dielectric constant and dielectric loss, making it suitable as a matrix material for high-frequency copper-clad laminates. With the development of technologies such as 5G, the market demand for high-vinyl liquid rubber is increasing.

[0004] Vinyl polybutadiene liquid rubber can be prepared using alkali metals or their organic compounds, particularly alkyl lithium compounds. The polymerization of butadiene under such catalysts proceeds via an anionic mechanism. Lithium-based catalysts allow for easy adjustment of the vinyl content; the vinyl content of the polymerization product can be adjusted over a wide range by adding polar additives (such as ethers, tertiary amines, and Lewis bases) to the system.

[0005] The current high-vinyl liquid polybutadiene-catalyst system has the following disadvantages: 1. It is difficult to prepare low molecular weight liquid polybutadiene; 2. It has a wide molecular weight distribution; 3. It contains variable valence metals.

[0006] Anionic solution polymerization can prepare liquid polybutadiene with low molecular weight and narrow distribution, but the lower the molecular weight, the more difficult it is to control the vinyl content. When the number average molecular weight of liquid polybutadiene is less than 3000, it is difficult to prepare liquid polybutadiene with a vinyl content of >80wt% using existing technology. Summary of the Invention:

[0007] The technical problem to be solved by the present invention is to provide a method for preparing high-vinyl liquid polybutadiene and its application. The method achieves that the prepared high-vinyl liquid polybutadiene has an ultra-low number-average molecular weight, while having a high vinyl content and a narrow molecular weight distribution index, which can meet the requirements of low-loss, high-frequency and high-speed copper clad laminate matrix material, so as to be better applied in the field of low-loss, high-frequency and high-speed copper clad laminate.

[0008] The technical solution adopted in this invention is: a method for preparing high-vinyl liquid polybutadiene, the method comprising the following steps:

[0009] S101, the composite structure modifier is mixed with a non-polar hydrocarbon solvent, and the structure modifier component is obtained after uniform mixing;

[0010] S102, an organolithium initiator is mixed with a nonpolar hydrocarbon solvent, and the mixture is homogeneous to obtain the initiating component;

[0011] S103, a non-polar hydrocarbon solvent and butadiene monomer are added to a polymerization reactor and mixed evenly to obtain a butadiene monomer mixed solution;

[0012] S104, add the structure-regulating component and the initiating component sequentially to the butadiene monomer mixed solution to start the polymerization reaction;

[0013] S105, after the polymerization reaction is completed, the glue is released. After removing the solvent, organic lithium initiator and composite structure modifier from the glue, a high vinyl liquid polybutadiene product is obtained.

[0014] The composite structure modifier includes structure modifier A and structure modifier B.

[0015] The structure of the structure modifier A is as follows:

[0016]

[0017] In this ring, R1 is a nitrogen-containing multi-ring, R2 is an oxygen-containing multi-ring, and R3 and R4 are independently selected from C1 to C2. 20 Alkyl or substituted alkyl, C3-C 20 cycloalkyl, C3-C 20 alkenyl, C6-C 20 aryl, C7~C 20 alkylaryl or C7~C 20 One or more of the aralkyl groups, wherein R3 and R4 are not the same;

[0018] The structure of the structure modifier B is as follows:

[0019] Me-O-R5

[0020] Me is an alkali metal element, and R5 is selected from C1 to C5.20 Alkyl or substituted alkyl, C3-C 20 cycloalkyl, C3-C 20 alkenyl, C6-C 20 aryl, C7~C 20 alkylaryl or C7~C 20 One or more of the aryl groups.

[0021] Furthermore, the nonpolar hydrocarbon solvent is selected from one or a combination of several of cyclohexane, hexane, n-heptane, isooctane, and n-octane.

[0022] Furthermore, the organolithium initiator is selected from one or a combination of several of ethyl lithium, n-propyl lithium, isopropyl lithium, n-butyl lithium, sec-butyl lithium, tert-butyl lithium, phenyl lithium, 2-naphthyl lithium, 4-butylphenyl lithium, 4-tolyl lithium, cyclohexyl lithium, and 4-butylcyclohexyl lithium.

[0023] Furthermore, R1 in the structure modifier A is selected from one of the four-membered ring, five-membered ring, and six-membered ring containing nitrogen, and R2 in the structure modifier A is selected from one of the four-membered ring, five-membered ring, and six-membered ring containing oxygen.

[0024] Furthermore, Me in the structure modifier B is selected from potassium and sodium.

[0025] Furthermore, the molar ratio of the composite structure modifier to the organolithium initiator is 0.1 to 10:1.

[0026] Furthermore, the molar ratio of structure modifier A to structure modifier B is 1 to 100:1.

[0027] Furthermore, the molar ratio of the organolithium initiator to the butadiene monomer is 0.005 to 0.1:1.

[0028] Furthermore, the polymerization temperature in S104 is less than -5°C.

[0029] Furthermore, the method for removing the organolithium initiator and composite structure modifier from the adhesive in S105 is as follows: the adhesive is mixed with water and an organic acid solution, and after separation, the lower aqueous phase is separated to remove the organolithium initiator and composite structure modifier from the adhesive.

[0030] Furthermore, the organic acid is one or a combination of stearic acid, oleic acid, adipic acid and citric acid.

[0031] Furthermore, the mass ratio of the adhesive solution to water is 1:1 to 20, and the H in the organic acid... + The molar ratio with the organolithium initiator is 1 to 5:1.

[0032] Furthermore, the high-vinyl liquid polybutadiene product, based on the total weight of the high-vinyl liquid polybutadiene, has a vinyl content of 95-98%, a number-average molecular weight of 500-9500, and a molecular weight distribution index of 1.01-1.03.

[0033] An application of high-vinyl liquid polybutadiene, which can be used as a matrix material for low-loss, high-frequency, and high-speed copper-clad laminates.

[0034] The beneficial effects of this invention are:

[0035] 1. The high-vinyl liquid polybutadiene prepared by the method of the present invention has a low number-average molecular weight, while having a high vinyl content and a narrow molecular weight distribution index, which can meet the requirements of low-loss, high-frequency and high-speed copper clad laminate matrix material, so as to be better applied in the field of low-loss, high-frequency and high-speed copper clad laminate.

[0036] 2. The method for preparing high-vinyl liquid polybutadiene, by utilizing specific types of composite structural modifiers and their proportions, can achieve a high degree of control over the vinyl content when the molecular weight of high-vinyl liquid polybutadiene is extremely low, and can also enable the liquid butadiene polymer to have a narrow molecular weight distribution index. Detailed implementation method:

[0037] Example 1

[0038] The method for preparing high-vinyl liquid polybutadiene used in this embodiment includes the following steps:

[0039] S101, the composite structure modifier is mixed with a non-polar hydrocarbon solvent, and the structure modifier component is obtained after uniform mixing;

[0040] S102, an organolithium initiator is mixed with a nonpolar hydrocarbon solvent, and the mixture is homogeneous to obtain the initiating component;

[0041] S103, a non-polar hydrocarbon solvent and butadiene monomer are added to a polymerization reactor and mixed evenly to obtain a butadiene monomer mixed solution;

[0042] S104, add the structure regulator and the initiator component sequentially to the butadiene monomer mixed solution to start the polymerization reaction;

[0043] S105, after the polymerization reaction is completed, the glue is released. After removing the initiator, composite structure modifier and solvent from the glue, a high vinyl liquid polybutadiene product is obtained.

[0044] The composite structure modifier includes structure modifier A and structure modifier B.

[0045] The structure of the structure modifier A is as follows:

[0046]

[0047] In this ring, R1 is a nitrogen-containing multi-ring, R2 is an oxygen-containing multi-ring, and R3 and R4 are independently selected from C1 to C2. 20 Alkyl or substituted alkyl, C3-C 20 cycloalkyl, C3-C 20 alkenyl, C6-C 20 aryl, C7~C 20 alkylaryl or C7~C 20 One or more of the aralkyl groups, wherein R3 and R4 are not the same;

[0048] The structure of the structure modifier B is as follows:

[0049] Me-O-R5

[0050] Among them, M e R5 is an alkali metal element, selected from C1 to C2. 20 Alkyl or substituted alkyl, C3-C 20 cycloalkyl, C3-C 20 alkenyl, C6-C 20 aryl, C7~C 20 alkylaryl or C7~C 20 One or more of the aryl groups.

[0051] The nonpolar hydrocarbon solvent is hexane.

[0052] The organolithium initiator is n-butyllithium.

[0053] R1 in the structure modifier A is a nitrogen-containing four-membered ring, and R2 in the structure modifier A is an oxygen-containing four-membered ring.

[0054] Me in the structure modifier B is sodium.

[0055] Furthermore, the molar ratio of the composite structure modifier to the organolithium initiator is 0.5:1.

[0056] Furthermore, the molar ratio of structure modifier A to structure modifier B is 3:1.

[0057] The molar ratio of the organolithium initiator to the butadiene monomer is 0.02:1.

[0058] The polymerization temperature in S104 is -8℃.

[0059] The method for removing the initiator and composite structure modifier from the adhesive in S105 is as follows: the adhesive is mixed with water and organic acid solution, and after separation, the lower aqueous phase is separated to remove the initiator and composite structure modifier from the adhesive.

[0060] The organic acid is citric acid.

[0061] Furthermore, the mass ratio of the adhesive solution to water is 1:10, and the H in the organic acid... + The molar ratio of the initiator to the initiator is 2:1.

[0062] The high-vinyl liquid polybutadiene product, based on the total weight of the high-vinyl liquid polybutadiene, has a vinyl content of 97.32%, a number-average molecular weight of 2766, and a molecular weight distribution index of 1.01.

[0063] Example 2

[0064] The method for preparing high-vinyl liquid polybutadiene used in this embodiment differs from that in Example 1 in that:

[0065] The nonpolar hydrocarbon solvent is cyclohexane.

[0066] The organolithium initiator is n-butyllithium.

[0067] R1 in the structure modifier A is a five-membered ring containing nitrogen, and R2 in the structure modifier A is a five-membered ring containing oxygen.

[0068] Me in the structure modifier B is potassium.

[0069] The molar ratio of the composite structure modifier to the organolithium initiator is 0.3:1.

[0070] The molar ratio of structure modifier A to structure modifier B is 5:1.

[0071] The molar ratio of the organolithium initiator to the butadiene monomer is 0.1:1.

[0072] The polymerization temperature in S104 is -10℃.

[0073] The method for removing the initiator and composite structure modifier from the adhesive in S105 is as follows: the adhesive is mixed with water and organic acid solution, and after separation, the lower aqueous phase is separated to remove the initiator and composite structure modifier from the adhesive.

[0074] The organic acid is citric acid.

[0075] The mass ratio of the adhesive to water is 1:15, and the H in the organic acid is... +The molar ratio of the initiator to the initiator is 3:1.

[0076] The high-vinyl liquid polybutadiene product, based on the total weight of the high-vinyl liquid polybutadiene, has a vinyl content of 95.87%, a number-average molecular weight of 552, and a molecular weight distribution index of 1.02.

[0077] Example 3

[0078] The method for preparing high-vinyl liquid polybutadiene used in this embodiment differs from that in Example 1 in that:

[0079] The nonpolar hydrocarbon solvent is cyclohexane.

[0080] The organolithium initiator is n-butyllithium.

[0081] In the structure modifier A, R1 is a five-membered ring containing nitrogen, and R2 is a four-membered ring containing oxygen.

[0082] Me in the structure modifier B is sodium.

[0083] The molar ratio of the composite structure modifier to the organolithium initiator is 1:1.

[0084] The molar ratio of structure modifier A to structure modifier B is 1:1.

[0085] The molar ratio of the organolithium initiator to the butadiene monomer is 0.01:1.

[0086] The polymerization temperature in S104 is -8℃.

[0087] The method for removing the initiator and composite structure modifier from the adhesive in S105 is as follows: the adhesive is mixed with water and organic acid solution, and after separation, the lower aqueous phase is separated to remove the initiator and composite structure modifier from the adhesive.

[0088] The organic acid is stearic acid.

[0089] The mass ratio of the adhesive to water is 1:10, and the H in the organic acid is... + The molar ratio of the initiator to the initiator is 2:1.

[0090] The high-vinyl liquid polybutadiene product, based on the total weight of the high-vinyl liquid polybutadiene, has a vinyl content of 95.62%, a number-average molecular weight of 5941, and a molecular weight distribution index of 1.01.

[0091] Example 4

[0092] The method for preparing high-vinyl liquid polybutadiene used in this embodiment differs from that in Example 1 in that:

[0093] The nonpolar hydrocarbon solvent is hexane.

[0094] The organolithium initiator is n-butyllithium.

[0095] R1 in the structure modifier A is a five-membered ring containing nitrogen, and R2 in the structure modifier A is a five-membered ring containing oxygen.

[0096] Me in the structure modifier B is potassium.

[0097] The molar ratio of the composite structure modifier to the organolithium initiator is 0.5:1.

[0098] The molar ratio of structure modifier A to structure modifier B is 20:1.

[0099] The molar ratio of the organolithium initiator to the butadiene monomer is 0.03:1.

[0100] The polymerization temperature in S104 is -10℃.

[0101] The method for removing the initiator and composite structure modifier from the adhesive in S105 is as follows: the adhesive is mixed with water and organic acid solution, and after separation, the lower aqueous phase is separated to remove the initiator and composite structure modifier from the adhesive.

[0102] The organic acid is citric acid.

[0103] The mass ratio of the adhesive to water is 1:15, and the H in the organic acid is... + The molar ratio of the initiator to the initiator is 1.5:1.

[0104] The high-vinyl liquid polybutadiene product, based on the total weight of the high-vinyl liquid polybutadiene, has a vinyl content of 95.77%, a number-average molecular weight of 1964, and a molecular weight distribution index of 1.01.

[0105] Example 5

[0106] The method for preparing high-vinyl liquid polybutadiene used in this embodiment differs from that in Example 1 in that:

[0107] The nonpolar hydrocarbon solvent is cyclohexane.

[0108] The organolithium initiator is n-butyllithium.

[0109] R1 in the structure modifier A is a five-membered ring containing nitrogen, and R2 in the structure modifier A is a five-membered ring containing oxygen.

[0110] Me in the structure modifier B is sodium.

[0111] The molar ratio of the composite structure modifier to the organolithium initiator is 0.2:1.

[0112] The molar ratio of structure modifier A to structure modifier B is 2:1.

[0113] The molar ratio of the organolithium initiator to the butadiene monomer is 0.08:1.

[0114] The polymerization temperature in S104 is -10℃.

[0115] The method for removing the initiator and composite structure modifier from the adhesive in S105 is as follows: the adhesive is mixed with water and organic acid solution, and after separation, the lower aqueous phase is separated to remove the initiator and composite structure modifier from the adhesive.

[0116] The organic acid is citric acid.

[0117] The mass ratio of the adhesive to water is 1:10, and the H in the organic acid is... + The molar ratio of the initiator to the initiator is 2:1.

[0118] The high-vinyl liquid polybutadiene product, based on the total weight of the high-vinyl liquid polybutadiene, has a vinyl content of 96.02%, a number-average molecular weight of 692, and a molecular weight distribution index of 1.01.

[0119] Example 6

[0120] The method for preparing high-vinyl liquid polybutadiene used in this embodiment differs from that in Example 1 in that:

[0121] The nonpolar hydrocarbon solvent is hexane.

[0122] The organolithium initiator is n-butyllithium.

[0123] R1 in the structure modifier A is a five-membered ring containing nitrogen, and R2 in the structure modifier A is a five-membered ring containing oxygen.

[0124] Me in the structure modifier B is sodium.

[0125] The molar ratio of the composite structure modifier to the organolithium initiator is 0.3:1.

[0126] The molar ratio of structure modifier A to structure modifier B is 1:1.

[0127] The molar ratio of the organolithium initiator to the butadiene monomer is 0.07:1.

[0128] The polymerization temperature in S104 is -10℃.

[0129] The method for removing the initiator and composite structure modifier from the adhesive in S105 is as follows: the adhesive is mixed with water and organic acid solution, and after separation, the lower aqueous phase is separated to remove the initiator and composite structure modifier from the adhesive.

[0130] The organic acid is citric acid.

[0131] The mass ratio of the adhesive to water is 1:10, and the H in the organic acid is... + The molar ratio of the initiator to the initiator is 2:1.

[0132] The high-vinyl liquid polybutadiene product, based on the total weight of the high-vinyl liquid polybutadiene, has a vinyl content of 96.17%, a number-average molecular weight of 796, and a molecular weight distribution index of 1.02.

[0133] As shown in Examples 1-6, the high-vinyl liquid polybutadiene prepared by the method of the present invention has an ultra-low number-average molecular weight, while having a high vinyl content and a narrow molecular weight distribution index, which can meet the requirements of low-loss, high-frequency and high-speed copper clad laminate matrix materials, so as to be better applied in the field of low-loss, high-frequency and high-speed copper clad laminates.

[0134] It is understood that the above specific description of the present invention is only for illustrating the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those skilled in the art should understand that modifications or equivalent substitutions can still be made to the present invention to achieve the same technical effect; as long as the use needs are met, they are all within the protection scope of the present invention.

Claims

1. A process for the preparation of a high-vinyl liquid polybutadiene, characterized in that: The method includes the following steps: S101, the composite structure modifier is mixed with a non-polar hydrocarbon solvent, and the structure modifier component is obtained after uniform mixing; S102, an organolithium initiator is mixed with a nonpolar hydrocarbon solvent, and the mixture is homogeneous to obtain the initiating component; S103, a non-polar hydrocarbon solvent and butadiene monomer are added to a polymerization reactor and mixed evenly to obtain a butadiene monomer mixed solution; S104, add the structure-regulating component and the initiating component sequentially to the butadiene monomer mixed solution to start the polymerization reaction; S105, after the polymerization reaction is completed, the glue is released. After removing the solvent, organic lithium initiator and composite structure modifier from the glue, a high vinyl liquid polybutadiene product is obtained. The composite structure modifier includes structure modifier A and structure modifier B. The structure of the structure modifier A is as follows: wherein R1 is a polycyclic ring containing nitrogen, R2 is a polycyclic ring containing oxygen, R3 and R4 are independently selected from one or more of C1-C6 alkyl or substituted alkyl, C3-C6 cycloalkyl, C2-C6 alkenyl, C6-C10 aryl, C7-C15 alkylaryl or C7-C15 arylalkyl, said R3 and R4 being different; 20 20 20 20 20 20 ;​​​​​ The structure modifier B has the structure Me-O-R5. wherein Me is an alkali metal element, R5is selected from one or more of C1-C 20 alkyl or substituted alkyl, C3-C 20 cycloalkyl, C3-C 20 alkenyl, C6-C 20 aryl, C7-C 20 alkylaryl, or C7-C 20 aralkyl.

2. The method for preparing high-vinyl liquid polybutadiene according to claim 1, characterized in that: The nonpolar hydrocarbon solvent is selected from one or a combination of several of cyclohexane, hexane, n-heptane, isooctane, and n-octane.

3. The method for preparing high-vinyl liquid polybutadiene according to claim 1, characterized in that: The organolithium initiator is selected from one or a combination of several of the following: ethyl lithium, n-propyl lithium, isopropyl lithium, n-butyl lithium, sec-butyl lithium, tert-butyl lithium, phenyl lithium, 2-naphthyl lithium, 4-butylphenyl lithium, 4-tolyl lithium, cyclohexyl lithium, and 4-butylcyclohexyl lithium.

4. The method for preparing high-vinyl liquid polybutadiene according to claim 1, characterized in that: R1 in the structure modifier A is selected from one of the four-membered ring, five-membered ring, and six-membered ring containing nitrogen, and R2 in the structure modifier A is selected from one of the four-membered ring, five-membered ring, and six-membered ring containing oxygen.

5. The method for preparing high-vinyl liquid polybutadiene according to claim 1, characterized in that: Me in the structure modifier B is selected from potassium or sodium.

6. The method for preparing high-vinyl liquid polybutadiene according to claim 1, characterized in that: The molar ratio of the composite structure modifier to the organolithium initiator is 0.1 to 10:

1.

7. The method for preparing high-vinyl liquid polybutadiene according to claim 1, characterized in that: The molar ratio of structure modifier A to structure modifier B is 1 to 100:

1.

8. The method for preparing high-vinyl liquid polybutadiene according to claim 1, characterized in that: The molar ratio of the organolithium initiator to the butadiene monomer is 0.005 to 0.1:

1.

9. The method for preparing high-vinyl liquid polybutadiene according to claim 1, characterized in that: The polymerization temperature in S104 is less than -5℃.

10. The method for preparing high-vinyl liquid polybutadiene according to claim 1, characterized in that: The method for removing the organolithium initiator and composite structure modifier from the adhesive in S105 is as follows: the adhesive is mixed with water and an organic acid solution, and after separation, the lower aqueous phase is separated to remove the organolithium initiator and composite structure modifier from the adhesive.

11. The method for preparing high-vinyl liquid polybutadiene according to claim 10, characterized in that: The organic acid is one or a combination of stearic acid, oleic acid, adipic acid and citric acid.

12. The method for preparing high-vinyl liquid polybutadiene according to claim 10, characterized in that: The mass ratio of the glue solution to water is 1:1-20, and the H + The molar ratio of the organic lithium initiator is 1-5:

1.

13. The method for preparing high-vinyl liquid polybutadiene according to claim 1, characterized in that: The high-vinyl liquid polybutadiene product, based on the total weight of the high-vinyl liquid polybutadiene, has a vinyl content of 95-98%, a number-average molecular weight of 500-9500, and a molecular weight distribution index of 1.01-1.

03.

14. An application of a high-vinyl liquid polybutadiene, wherein the high-vinyl liquid polybutadiene is prepared according to the preparation method of any one of claims 1 to 13, characterized in that: The high-vinyl liquid polybutadiene can be used as a matrix material for low-loss, high-frequency, and high-speed copper-clad laminates.

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