Photo-curing system and curing method of low-molecular-weight vinyl-terminated fluorine-containing polymer

Abstract

The invention discloses a photocuring system and a curing method of a low-molecular-weight vinyl-terminated fluorine-containing polymer, and relates to a photocuring system and a curing method of a polymer, the photocuring system comprises the following components by mass: 35-75% of a low-molecular-weight vinyl-terminated fluorine-containing polymer, 15-45% of an active diluent, 0.1-5% of a photoinitiator, 0.1-5% of a light absorber, 0.1-10% of an assistant crosslinker, 0.1-1% of a metal salt, and 0.1-1% of a fluorinating reagent. And after all the components are uniformly mixed, rapid photocuring molding can be realized within 20 minutes. The photocuring system and the photocuring method have the characteristics of being rapid and efficient in process, energy-saving and environment-friendly, the fluorine content of a cured product can reach 66% at most, and the photocuring system and the photocuring method are widely applied to the fields of low-molecular-weight vinyl-terminated fluorine-containing polymer functional coatings, adhesives, sealants, 3D printing and the like.

Description

Technical Field

[0001] The invention relates to a polymer photocuring system and a curing method, in particular to a photocuring system and a curing method for a low molecular weight vinyl-terminated fluorine-containing polymer. Background Art

[0002] Low molecular weight fluorinated polymers have good fluidity and plasticity, and can be cured into various shapes as required. They are important high-performance materials in the fields of transportation, high-tech, and national defense. The curing of low molecular weight fluorinated polymers is to complete cross-linking and curing by using the reaction between functional groups. The reaction principle follows the chemical reaction between organic functional groups. The cross-linking speed and degree of cross-linking depend on the structural characteristics such as functionality and the activity of the reactive functional groups. Reactive functional groups can react with curing agents containing epoxy groups, isocyanate groups and other functional groups, but the curing temperature is relatively high. To solve this problem, patent 201610516206.9 discloses a method for preparing a vinyl-terminated liquid fluoroelastomer that can be quickly cured at room temperature. The prepared vinyl-terminated fluoroelastomer is used as a raw material, and primary amines and secondary amines are used as curing agents. Although it can be cured at room temperature, it still takes at least 2 hours to completely cure into a film, and the tensile strength is relatively low.

[0003] Photocuring technology is a rapidly developing technology in recent years and is widely used in the fields of photocuring adhesives, photoresists, 3D printing, etc. The main advantages of photocuring technology are environmental protection, rapidity, and high efficiency. The photocuring reaction can be carried out at room temperature and the curing time only takes tens of seconds or minutes. Introducing photocuring technology into the fluororubber curing system to replace the traditional thermal curing system can solve the problems of energy consumption, environmental pollution, and low efficiency in the existing thermal curing system. Summary of the invention

[0004] The purpose of the present invention is to provide a photocuring system and a curing method for a low molecular weight vinyl-terminated fluorine-containing polymer. The present invention adopts UV photocuring technology, efficiently cures at room temperature, saves energy consumption, and the addition of metal ions reduces the activation energy of double bonds in the system, promotes the curing reaction, and can increase the hardness of the product and improve the mechanical properties of the cured product.

[0005] The objective of the present invention is achieved through the following technical solutions: A photocurable system of a low molecular weight vinyl-terminated fluorine-containing polymer, characterized in that it comprises the following components in terms of mass percentage: Low molecular weight vinyl-terminated fluorinated polymer 35~75%, reactive diluent 15~45%, photoinitiator 0.1~5%, light absorber 0.1~5%, auxiliary cross-linking agent 0.1~10%, metal salt 0.1~1%, fluorination agent 0.1~1%.

[0006] Furthermore, in the above technical solution, the low molecular weight vinyl-terminated fluorine-containing polymer is a polymer containing fluorine atoms on the main chain or side chain carbon atoms and vinyl groups at the chain ends. 3 ~5×10 4 within the range.

[0007] The low molecular weight vinyl-terminated fluorine-containing polymer can be a fluoroolefin copolymer containing a terminal vinyl group, selected from vinylidene fluoride-tetrafluoroethylene copolymer, vinylidene fluoride-chlorotrifluoroethylene copolymer, vinylidene fluoride-perfluoromethyl vinyl ether copolymer, vinylidene fluoride-hexafluoropropylene copolymer, vinylidene fluoride-perfluoroethyl vinyl ether copolymer, vinylidene fluoride-perfluoropropyl vinyl ether copolymer, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, vinylidene fluoride-tetrafluoroethylene-perfluoromethyl vinyl ether terpolymer, vinylidene fluoride-tetrafluoroethylene-perfluoroethyl vinyl ether terpolymer; Or it is a copolymer of fluoroolefins and non-fluoroolefins containing terminal vinyl groups, selected from tetrafluoroethylene-propylene copolymers, tetrafluoroethylene-ethylene copolymers, monochlorotrifluoroethylene-ethylene copolymers, perfluoromethyl vinyl ether-ethylene copolymers, vinylidene fluoride-tetrafluoroethylene-propylene terpolymers, and hexafluoropropylene-tetrafluoroethylene-propylene terpolymers.

[0008] Furthermore, in the above technical scheme, the active diluent is a combination of one or more of 1,6-hexanediol diacrylate, tripropylene glycol diacrylate, dipropylene glycol diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated neopentyl glycol diacrylate, (propoxy) propylene glycol triacrylate, dodecafluoroheptyl methacrylate, hexafluorobutyl methacrylate, and trifluoroethyl methacrylate.

[0009] Furthermore, in the above technical solution, the photoinitiator is a combination of one or more of (2,4,6-trimethylbenzoyl)diphenylphosphine oxide (TPO), phenylbis(2,4,6-trimethylbenzoyl)phenylphosphine oxide (819), 2-hydroxy-2-methyl-1-phenyl-1-propanone (1173), and 2-isopropylthioxanthone (ITX).

[0010] Furthermore, in the above technical solution, the auxiliary cross-linking agent is a combination of one or more of triallyl cyanurate (TAC), triallyl isocyanurate (TAIC), and aluminum acetylacetonate.

[0011] Furthermore, in the above technical solution, the light absorber is a combination of one or more of 2-(2'-hydroxy-3',5'-di-tert-phenyl)-5-chlorobenzotriazole (UV-320), 2-hydroxy-4-methoxybenzophenone (UV-9), and 2-hydroxy-4-n-octyloxybenzophenone (UV-531).

[0012] Furthermore, in the above technical solution, the metal salt is a combination of one or more of zinc naphthenate, zinc stearate, zinc acetate, cobalt naphthenate, cobalt acetate, ferric nitrate, ferric sulfate, and ferric chloride.

[0013] Furthermore, in the above technical solution, the fluorination agent is a combination of one or more of 1-chloromethyl-4-fluoro-1,4-diazabicyclo[2.2.2]octane di(tetrafluoroborate) salt and 1-chloromethyl-4-fluoro-1,4-diazabicyclo[2.2.2]octane bis(trifluoromethanesulfonate).

[0014] The specific curing method uses a low molecular weight vinyl-terminated fluorinated polymer as a raw material, dissolves it with a metal salt, a fluorination agent and other additives in an organic solvent, mixes them in a dark environment, and after ball milling, further disperses them evenly using ultrasound. After drying, a vacuum defoaming barrel is used to assist defoaming, and then the product is cured in a light curing oven to obtain a UV light-cured product. The method specifically includes the following steps: (1) Dissolve a low molecular weight vinyl-terminated fluorinated polymer, a reactive diluent and a metal salt in an organic solvent at room temperature, and mix them evenly by ball milling for 0.1 to 2 hours to obtain a solution A; (2) Dissolve the photoinitiator, light absorber, co-crosslinking agent and fluorination agent in an organic solvent at room temperature, and mix them evenly by magnetic stirring for 0.1 to 2 hours to obtain solution B; (3) At room temperature, solution A and solution B are placed in a bottle, covered with tin foil to avoid light, mixed, dispersed with the aid of ultrasonic vibration, dried in a 30-50°C forced air drying oven for 0.5-24 h, and defoamed in a vacuum defoaming tank; (4) When using light curing equipment, cure at a distance of 10 to 20 cm below the light source.

[0015] Optionally, the solvent is one or more compounded organic solvent systems, which can be selected from one or more compounded solvent systems of dichloromethane, cyclohexane, acetonitrile, dimethyl sulfoxide, N,N-dimethylformamide, toluene, acetone, and tetrahydrofuran.

[0016] Optionally, the light curing light source is an LED light source or an LCD light source, the wavelength of the light source is 350-490 nm, and the curing time is 0.2-12 h; Optionally, the ultrasonic power is 300-800 W, and the ultrasonic time is 10-60 min.

[0017] The advantages and effects of the present invention are: The present invention adopts UV light curing technology, and can achieve high-efficiency curing of low molecular weight fluorine-containing polymers within 20 minutes under normal temperature and light conditions, thereby greatly saving energy consumption and reducing production costs.

[0018] The addition of metal ions in the present invention reduces the activation energy of double bonds in the system, promotes the curing reaction, and can improve the hardness of the product.

[0019] After adding the auxiliary cross-linking agent, the mechanical properties of the cured product are further improved, and the alkali resistance and oil resistance are also improved.

[0020] The present invention uses high-power ultrasound to ensure uniform dispersion of various components in the fluorine-containing polymer.

[0021] The addition of the fluorination agent in the present invention further increases the fluorine content of the obtained light-curable low molecular weight vinyl-terminated fluorine-containing polymer (up to 66%), and the product can be used in functional coatings, adhesives, sealants and 3D printing and other fields. Implementation

[0022] The following non-limiting embodiments may enable a person skilled in the art to more fully understand the present invention, but are not intended to limit the present invention in any way. Example 1

[0023] 5g of low molecular weight vinyl-terminated fluorine-containing polymer (vinyl-terminated vinylidene fluoride-hexafluoropropylene copolymer, number average molecular weight 3000, double bond content 0.52mmol / g) and 30wt% of diluent tripropylene glycol diacrylate were dissolved in 5ml of tetrahydrofuran, and the mixture was stirred by ball milling for 0.1~2h to be evenly mixed to obtain solution A; 4wt% of photoinitiator 1173, 0.5wt% of light absorber UV-320 and 0.1wt% of 1-chloromethyl-4-fluoro-1,4-diazabicyclo[2.2.2]octane di(tetrafluoroborate) salt were dissolved in 2ml of tetrahydrofuran, and the mixture was stirred by magnetic stirring for 0.1~2h to be evenly mixed to obtain solution B. Pour solution A and solution B into a bottle, cover with tin foil to avoid light, mix, use ultrasonic vibration to assist dispersion, then put it in a 30-50℃ forced air drying oven to dry for 0.5-24 hours, and defoam in a vacuum defoaming bucket; then pour the mixed solution into the preheated mold, put it in a light curing oven for light curing, react for 35 minutes, and obtain a light-cured product. Example 2

[0024] 5g of low molecular weight vinyl-terminated fluorine-containing polymer (vinyl-terminated vinylidene fluoride-hexafluoropropylene copolymer, number average molecular weight 3200, double bond content 0.45mmol / g), 0.5wt% of zinc cyclohexaneate and 35wt% of active diluent dipropylene glycol diacrylate were dissolved in 5ml of acetone, and the mixture was stirred by ball milling for 0.1~2h to obtain solution A; 4wt% of photoinitiator TPO, 0.5wt% of light absorber UV-531, 5wt% of auxiliary cross-linking agent TAIC and 0.1wt% of 1-chloromethyl-4-fluoro-1,4-diazabicyclo[2.2.2]octane di(tetrafluoroborate) salt were dissolved in 2ml of acetone, and the mixture was stirred by magnetic stirring for 0.1~2h to obtain solution B. Pour solution A and solution B into a bottle, cover with tin foil to avoid light and mix, use ultrasonic vibration to assist dispersion, then put it in a 30-50℃ forced air drying oven to dry for 0.5-24 hours, defoam in a vacuum defoaming barrel, and then pour the mixed solution into a preheated mold, put it in a light curing oven for light curing, react for 20 minutes, and obtain a light-cured product. Example 3

[0025] 5g of low molecular weight vinyl-terminated fluorinated polymer (vinyl-terminated vinylidene fluoride-hexafluoropropylene copolymer, number average molecular weight 3500, double bond content 0.43mmol / g), 0.5wt% of cobalt acetate and 35wt% of active diluent 1,6-hexanediol diacrylate were dissolved in 5ml of acetone, and the mixture was stirred by ball milling for 0.1-2h to obtain solution A; 3wt% of photoinitiator TPO, 0.5wt% of light absorber UV-9, 5wt% of auxiliary cross-linking agent TAIC and 0.2w t% of 1-chloromethyl-4-fluoro-1,4-diazabicyclo[2.2.2]octane di(tetrafluoroborate) salt was dissolved in 2 ml of acetone and stirred by ball mill for 0.1-2 h to obtain solution B; solution A and solution B were poured into a bottle, covered with tin foil to avoid light and mixed, and dispersed with the aid of ultrasonic vibration. Then, the solution was placed in a 30-50°C forced air drying oven for 0.5-24 h, and defoamed in a vacuum defoaming barrel. Then, the mixed solution was poured into a preheated mold, placed in a light curing oven for light curing, and reacted for 30 min to obtain a light-cured product. Example 4

[0026] 5g of low molecular weight vinyl-terminated fluorinated polymer (vinyl-terminated vinylidene fluoride-tetrafluoroethylene-hexafluoropropylene terpolymer, number average molecular weight 2900, double bond content 0.59mmol / g), 0.5wt% of ferric sulfate and 20wt% of active diluent dipropylene glycol diacrylate were dissolved in 5ml of dichloromethane, and the mixture was stirred by ball milling for 0.1-2h to obtain solution A. 4wt% of photoinitiator ITX and 0.2wt% of 1-chloromethyl-4-fluoro-1 ,4-diazabicyclo[2.2.2]octane bis(trifluoromethanesulfonate) was dissolved in 2 ml of dichloromethane and mixed evenly by magnetic stirring for 0.1-2 h to obtain solution B; solution A and solution B were poured into a bottle, covered with tin foil to avoid light and mixed, and dispersed with the aid of ultrasonic vibration. Then, the solution was placed in a 30-50°C forced air drying oven for 0.5-24 h, and defoamed in a vacuum defoaming barrel. Then, the mixed solution was poured into a preheated mold, placed in a light curing oven for light curing, and reacted for 20 min to obtain a light-cured product. Example 5

[0027] 5g of low molecular weight vinyl-terminated fluorinated polymer (vinyl-terminated vinylidene fluoride-tetrafluoroethylene-hexafluoropropylene terpolymer, number average molecular weight 2950, ​​double bond content 0.57mmol / g), 1wt% of ferric sulfate and 25wt% of active diluent methacrylate dodecafluoroheptyl ester were dissolved in 5ml of N,N-dimethylformamide, and the mixture was stirred by ball milling for 0.1-2h to obtain solution A; 4wt% of photoinitiator 784, 4wt% of auxiliary crosslinking agent TAC and 0.2wt% of 1-chloromethyl-4-fluoro-1,4-diazabicyclo[2.2.2]octane bis(trifluoromethanesulfonate) were dissolved in 2ml of N,N-dimethylformamide, stir magnetically for 0.1~2h to mix evenly to obtain solution B; pour solution A and solution B into a bottle, cover with tin foil to avoid light, mix, use ultrasonic vibration to assist dispersion, then put it in a 30~50℃ forced air drying oven to dry for 0.5~24h, defoam in a vacuum defoaming barrel, and then pour the mixed solution into a preheated mold, put it in a light curing oven for light curing, react for 30min, and obtain a light-cured product. Example 6

[0028] 5g of low molecular weight vinyl-terminated fluorinated polymer (vinyl-terminated vinylidene fluoride-tetrafluoroethylene-hexafluoropropylene terpolymer, number average molecular weight 3100, double bond content 0.55mmol / g), 1wt% of zinc stearate and 25wt% of active diluent ethoxylated trimethylolpropane triacrylate were dissolved in 5ml of cyclohexane, and the mixture was stirred by ball milling for 0.1-2h to obtain solution A; 3wt% of photoinitiator 1173 and photoinitiator 819, 4wt% of auxiliary crosslinking agent TAIC and 0.5wt% of 1-chloromethyl-4-fluoro-1,4-diazabicyclo[2.2.2]octane di(tetrafluoroborate) salt were dissolved in 2ml of N,N-dimethylformamide, stir magnetically for 0.1~2h to mix evenly to obtain solution B; pour solution A and solution B into a bottle, cover with tin foil to avoid light, mix, use ultrasonic vibration to assist dispersion, then put it in a 30~50℃ forced air drying oven to dry for 0.5~24h, defoam in a vacuum defoaming barrel, and then pour the mixed solution into a preheated mold, put it in a light curing oven for light curing, react for 30min, and obtain a light-cured product. Example 7

[0029] 5g of low molecular weight vinyl-terminated fluorinated polymer (vinyl-terminated vinylidene fluoride-tetrafluoroethylene-hexafluoropropylene terpolymer, number average molecular weight 3350, double bond content 0.51mmol / g), 1wt% of zinc acetate and 25wt% of active diluent 1,6-hexanediol diacrylate / hydroxymethylpropane triacrylate were dissolved in 5ml of dichloromethane / tetrahydrofuran, and the mixture was stirred by ball milling for 0.1-2h to obtain solution A; 3wt% of photoinitiator 784, 5wt% of auxiliary cross-linking agent aluminum acetylacetonate and 1wt% of 1-chloromethyl-4-fluoro-1,4-diazabicyclo[2.2.2]octane di(tetrafluoroborate) salt were dissolved in 2ml of In dichloromethane / tetrahydrofuran, stir magnetically for 0.1-2h to mix evenly to obtain solution B; pour solution A and solution B into a bottle, cover with tin foil to avoid light, mix, use ultrasonic vibration to assist dispersion, then put it in a 30-50℃ forced air drying oven to dry for 0.5-24h, defoam in a vacuum defoaming barrel, and then pour the mixed solution into a preheated mold, put it in a light curing oven for light curing, react for 35min, and obtain a light-cured product.

[0030] Test 1 The tensile properties of the products of Examples 1 to 7 were tested using an Instron 3365 universal tensile testing machine according to GB / T528-2009 standard. The tensile rate was 500 mm / min, the test temperature was 25°C, and at least 5 specimens were tested for each sample, and the average value was taken.

[0031] Test 2 The hardness test of the products in Examples 1 to 7 was conducted using an LX-A hardness tester according to GB / T531.1-2008 standard. The sample thickness was greater than 6 mm. Four points were evenly taken on the surface of the sample for testing, and the average was taken as the hardness of the sample.

[0032] Schedule: Performance indexes of light-curable low molecular weight vinyl-terminated fluorinated polymers sample Tensile strength (MPa) Elongation at break (%) Shore A Hardness Resistance to 3# aviation kerosene (%, 25℃×72h, mass change rate) Resistance to 40.00wt% NaOH (%, 25℃×72h, mass change rate) Example 1 1.95 107.97 38 0.25 4.90 Example 2 2.33 103.33 39 0.22 3.94 Example 3 2.45 100.16 42 0.20 3.63 Example 4 2.43 101.76 40 0.22 4.05 Example 5 2.66 99.24 40 0.20 3.91 Example 6 2.85 97.58 42 0.19 3.78 Example 7 2.98 96.87 42 0.18 3.78 The embodiments of the present invention are described in detail above; however, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0033] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A photocurable system of a low molecular weight vinyl-terminated fluorinated polymer, characterized in that: The system is composed of the following components in terms of mass percentage: Low molecular weight vinyl-terminated fluorinated polymer 35~75%, reactive diluent 15~45%, photoinitiator 0.1~5%, light absorber 0.1~5%, auxiliary cross-linking agent 0.1~10%, metal salt 0.1~1%, fluorination agent 0.1~1%.

2. The photocuring system of low molecular weight vinyl-terminated fluorinated polymer according to claim 1, characterized in that: The low molecular weight vinyl-terminated fluorine-containing polymer is a polymer containing fluorine atoms on the main chain or side chain atoms and vinyl groups at the chain ends; the number average molecular weight is 0.5×10 3 ~5×10 4 within the scope; The low molecular weight vinyl-terminated fluorine-containing polymer is a polymer containing fluorine atoms on the main chain or side chain and vinyl groups at the chain end; it is a fluoroolefin copolymer containing terminal vinyl groups, selected from vinylidene fluoride-tetrafluoroethylene copolymer, vinylidene fluoride-chlorotrifluoroethylene copolymer, vinylidene fluoride-perfluoromethyl vinyl ether copolymer, vinylidene fluoride-hexafluoropropylene copolymer, vinylidene fluoride-perfluoroethyl vinyl ether copolymer, vinylidene fluoride-perfluoropropyl vinyl ether copolymer, vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, vinylidene fluoride-tetrafluoroethylene-perfluoromethyl vinyl ether terpolymer, vinylidene fluoride-tetrafluoroethylene-perfluoroethyl vinyl ether terpolymer; Or it is a copolymer of fluoroolefins and non-fluoroolefins containing terminal vinyl groups, selected from tetrafluoroethylene-propylene copolymers, tetrafluoroethylene-ethylene copolymers, monochlorotrifluoroethylene-ethylene copolymers, perfluoromethyl vinyl ether-ethylene copolymers, vinylidene fluoride-tetrafluoroethylene-propylene terpolymers, and hexafluoropropylene-tetrafluoroethylene-propylene terpolymers.

3. The photocuring system of low molecular weight vinyl-terminated fluorinated polymer according to claim 1, characterized in that: The active diluent is a combination of one or more of 1,6-hexanediol diacrylate, tripropylene glycol diacrylate, dipropylene glycol diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, ethoxylated trimethylolpropane triacrylate, propoxylated neopentyl glycol diacrylate, (propoxy) glycerol triacrylate, dodecafluoroheptyl methacrylate, hexafluorobutyl methacrylate, and trifluoroethyl methacrylate.

4. The photocuring system of low molecular weight vinyl-terminated fluorinated polymer according to claim 1, characterized in that: The photoinitiator is a combination of one or more of (2,4,6-trimethylbenzoyl)diphenylphosphine oxide (TPO), phenylbis(2,4,6-trimethylbenzoyl)phenylphosphine oxide (819), 2-hydroxy-2-methyl-1-phenyl-1-propanone (1173), and 2-isopropylthioxanthone (ITX).

5. The photocurable system of low molecular weight vinyl-terminated fluorinated polymer according to claim 1, characterized in that: The system satisfies at least one of the following (1) to (4): (1) The auxiliary cross-linking agent is a combination of one or more of triallyl cyanurate (TAC), triallyl isocyanurate (TAIC), and aluminum acetylacetonate; (2) The light absorber is a combination of one or more of 2-(2'-hydroxy-3',5'-di-tert-phenyl)-5-chlorobenzotriazole (UV-320), 2-hydroxy-4-methoxybenzophenone (UV-9), and 2-hydroxy-4-n-octyloxybenzophenone (UV-531); (3) The metal salt is a combination of one or more of zinc naphthenate, zinc stearate, zinc acetate, cobalt naphthenate, cobalt acetate, ferric nitrate, ferric sulfate, and ferric chloride; (4) The fluorination agent is a combination of one or more of 1-chloromethyl-4-fluoro-1,4-diazabicyclo[2.2.2]octane di(tetrafluoroborate) salt and 1-chloromethyl-4-fluoro-1,4-diazabicyclo[2.2.2]octane bis(trifluoromethanesulfonate).

6. A method for preparing a photocurable system of a low molecular weight vinyl-terminated fluorinated polymer, characterized in that: The method comprises the following steps: (1) Dissolve a low molecular weight vinyl-terminated fluorinated polymer, a reactive diluent and a metal salt in an organic solvent at room temperature, and mix them evenly by ball milling for 0.1 to 2 hours to obtain a solution A; (2) Dissolve the photoinitiator, light absorber, co-crosslinking agent and fluorination agent in an organic solvent at room temperature, and mix them evenly by magnetic stirring for 0.1 to 2 hours to obtain solution B; (3) At room temperature, pour solution A and solution B into a bottle, cover with tin foil to avoid light, mix, use ultrasonic vibration to assist dispersion, dry in a 30-50℃ forced air drying oven for 0.5-24h, and defoam in a vacuum defoaming tank; (4) When using light curing equipment, cure at a distance of 10 to 20 cm below the light source.

7. The method for preparing a photocurable system of a low molecular weight vinyl-terminated fluorine-containing polymer according to claim 6, characterized in that: The solvent is one or more compounded organic solvent systems; one or more compounded solvent systems selected from dichloromethane, cyclohexane, acetonitrile, dimethyl sulfoxide, N,N-dimethylformamide, toluene, acetone, and tetrahydrofuran.

8. The method for preparing a photocurable system of a low molecular weight vinyl-terminated fluorine-containing polymer according to claim 6, characterized in that: The light curing light source is an LED light source or an LCD light source, the wavelength of the light source is 350-490nm, and the curing time is 0.2-12h.

9. The method for preparing a photocurable system of a low molecular weight vinyl-terminated fluorine-containing polymer according to claim 6, characterized in that: The ultrasonic power is 300-800W, and the ultrasonic time is 10-60min.