Acrylate resin and preparation method thereof

Abstract

The invention provides acrylate resin and a preparation method thereof, and particularly relates to phase-transition acrylate resin and a preparation method thereof. The preparation raw materials of the acrylate resin comprise the following components in parts by weight: 35-55 parts of (methyl) acrylate containing C14 or more linear alkyl groups, 35-55 parts of (methyl) acrylate containing C1-C6 alkyl groups, 0.1-10 parts of a functional monomer and 0.5-3 parts of a silicon-containing monomer. According to the present invention, the preparation raw materials of the acrylate resin are designed, and through the cooperation of the components, the acrylate resin with excellent performance is prepared, and the acrylate resin has characteristics of suitable weight-average molecular weight, suitable polydispersity, high temperature resistance and high adhesiveness.

Description

Technical Field

[0001] The invention belongs to the technical field of acrylate resins, and specifically relates to an acrylate resin and a preparation method thereof, and more specifically relates to a phase transition acrylate resin and a preparation method thereof. Background Art

[0002] When the phase transition polymer exists below its crystalline melting point, it is in the form of crystals. When it exists alone, it is solid. When mixed with other liquid resins and monomers, the non-crystalline region of the polymer is partially dissolved by the liquid resin or monomer, making the mixed system present a highly viscous heterogeneous characteristic. Once heated to near the melting point of the polymer, the crystalline region melts, and the polymer can sharply reduce the viscosity of the mixed system. After cooling, the polymer dissolved in the system can restore the side chain crystalline state, and the crystalline region is dispersed in the mixed system at a scale of nearly nanometers. The polymers reported more in research are homopolymers or copolymers of extra-long carbon chain acrylates or corresponding methacrylates, but methacrylate polymers are too rigid due to the steric hindrance of the main chain methyl group, which hinders the movement and crystallization of the side chain, resulting in a decrease in the crystalline melting temperature of such polymers. Compared with the straight-chain fatty alcohol acrylates of the same length, the melting point of long-chain fatty alcohol methacrylate polymers is generally about 15°C lower than the crystalline melting point of acrylate polymers. The crystalline melting temperature of long-chain fatty alcohol acrylate polymer is closely related to the number of carbon atoms in its side chain. The more carbon atoms in the side chain, the higher the melting point of the side chain crystalline polymer. When the carbon number of the fatty alcohol reaches more than 10, the formed acrylate polymer can form side chain crystals near room temperature. The long-chain fatty alcohol as a precursor also has a fixed melting point, which is also related to the number of carbon atoms. Generally, after the formation of acrylate polymer, the crystalline melting point of the polymer side chain is several degrees lower than the melting point of the precursor long-chain fatty alcohol to more than ten degrees, and the fewer the number of carbon atoms, the greater the difference. Generally, when the carbon number of the long-chain fatty alcohol reaches more than 18, the crystalline melting point of the polyacrylate side chain is only about 4 to 8°C lower than the melting point of the long-chain fatty alcohol. For straight-chain octadecyl alcohol acrylate, the corresponding polymer side chain crystalline melting temperature is 50°C, and the crystalline melting temperature of the straight-chain docosyl alcohol acrylate polymerization can be increased to 60°C.

[0003] At present, the side chain crystalline polymers that are widely reported are homopolymers or copolymers of long carbon chain acrylates or corresponding methacrylates. For example, CN106133011A discloses a side chain crystalline polymer, whose side chain is a straight carbon alkyl with more than 16 carbon atoms. The side chain crystalline polymer has a low melting point, resulting in low temperature resistance and peel strength. For example, CN102317399A "Thermosensitive Adhesive and Thermosensitive Adhesive Tape" uses metal chelates to form coordination bonds with side chain crystalline polymers to improve the heat resistance of the adhesive. This technical solution has limited effect by relying solely on coordination bonds.

[0004] Therefore, how to provide a phase transition acrylate resin with excellent comprehensive properties has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] In view of the shortcomings of the prior art, the object of the present invention is to provide an acrylate resin and a preparation method thereof, and more specifically to a phase transition acrylate resin and a preparation method thereof. The present invention designs the raw materials for preparing the acrylate resin and prepares an acrylate resin with excellent performance through the coordination of various components. The acrylate resin has a suitable weight average molecular weight and suitable polydispersity as well as high temperature resistance and high adhesion.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides an acrylate resin, wherein the raw materials for preparing the acrylate resin include the following components in parts by weight:

[0008]

[0009] The present invention designs the raw materials for preparing the acrylic resin and prepares the acrylic resin with excellent performance through the coordination of various components. The acrylic resin has a suitable weight-average molecular weight and suitable polydispersity as well as high temperature resistance and high adhesion.

[0010] The acrylate resin provided by the present invention is an acrylate resin with phase transition performance. When it exists alone, it is solid. However, when it is mixed with other materials in the subsequent use process, the non-crystalline region of the acrylate resin is partially dissolved by the other materials, so that the mixed system presents a heterogeneous characteristic with extremely high viscosity. Once heated to near the melting point of the acrylate resin, the crystalline region melts, and the acrylate resin can sharply reduce the viscosity of the mixed system. After cooling, the polymer dissolved in the system can restore the side chain crystal state, and the crystal region is dispersed in the mixed system at a scale of nearly nanometers.

[0011] The present invention prepares an acrylate resin with excellent comprehensive performance by using a (meth)acrylate containing a straight-chain alkyl group of C14 or above; if a (meth)acrylate containing a branched alkyl group of C14 or above or a (meth)acrylate containing a straight-chain alkyl group of less than C14 is used, the acrylate will not have a phase transition function, the comprehensive performance is poor, and there is no practical application significance.

[0012] The present invention uses a silicon-containing monomer and copolymerizes the C=C in the silicon-containing monomer with acrylate (including (meth)acrylate containing a C14 or higher straight-chain alkyl group and (meth)acrylate containing a C1-C6 alkyl group) to introduce the silicon-containing monomer into the polyacrylate molecular chain, and tightly binds in the form of a covalent bond. The chemical structure is as follows:

[0013] Here, R, R′ and R″ represent H, a C1-C6 alkyl group in a C1-C6 alkyl group-containing (meth)acrylate, or a C14 or higher linear alkyl group in a C14 or higher linear alkyl group-containing (meth)acrylate.

[0014] Silicon-containing monomers not only have the characteristics of high temperature resistance, oxidation resistance, low surface energy, good flexibility, etc., but also can improve the adhesion of acrylic resin. The present invention further controls the amount of silicon-containing monomers in the acrylic resin so that the silicon-containing monomers have good compatibility with other raw material components of the acrylic resin. If the weight fraction of the silicon-containing monomer is small, the adhesion of the prepared acrylic resin is poor; if the weight fraction of the silicon-containing monomer is large, in the subsequent preparation process of the acrylic resin, the silicon-containing monomer will self-polymerize to form local crosslinks, the viscosity is relatively high or even gel, resulting in poor compatibility, loose bonding with the main acrylic resin structure, and affecting the adhesion of the acrylic resin.

[0015] In the present invention, the amount of (meth)acrylate containing a C14 or higher linear alkyl group in the raw material for preparing the acrylic resin can be 35 parts, 36 parts, 38 parts, 40 parts, 42 parts, 44 parts, 46 parts, 48 ​​parts, 50 parts, 52 parts, 54 parts or 55 parts, etc.

[0016] The amount of (meth)acrylate containing C1-C6 alkyl in the raw materials for preparing the acrylic resin can be 35 parts, 36 parts, 38 parts, 40 parts, 42 parts, 44 parts, 46 parts, 48 ​​parts, 50 parts, 52 parts, 54 parts or 55 parts, etc.

[0017] The amount of the functional monomer in the raw material for preparing the acrylic resin can be 0.1 parts, 0.2 parts, 0.5 parts, 1 parts, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts.

[0018] The amount of the silicon-containing monomer in the raw material for preparing the acrylic resin can be 0.5 parts, 0.8 parts, 1 parts, 1.2 parts, 1.5 parts, 1.8 parts, 2 parts, 2.2 parts, 2.4 parts, 2.6 parts, 2.8 parts or 3 parts, etc.

[0019] The number of carbon atoms in the linear alkyl group of the (meth)acrylate containing a linear alkyl group of C14 or higher may be 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24 or 25, etc.

[0020] The number of carbon atoms of the C1-C6 alkyl group in the (meth)acrylate containing the C1-C6 alkyl group may be 1, 2, 3, 4, 5 or 6.

[0021] It should be noted that, in the (meth)acrylate containing a C14 or higher straight-chain alkyl group, "(meth)" means that the methyl group may be present or absent, that is, the (meth)acrylate containing a C14 or higher straight-chain alkyl group means an acrylate containing a C14 or higher straight-chain alkyl group or a methacrylate containing a C14 or higher straight-chain alkyl group; similarly, the (meth)acrylate containing a C1-C6 alkyl group means an acrylate containing a C1-C6 alkyl group or a methacrylate containing a C1-C6 alkyl group.

[0022] The following are preferred technical solutions of the present invention, but are not intended to limit the technical solutions provided by the present invention. Through the following preferred technical solutions, the objectives and beneficial effects of the present invention can be better achieved and realized.

[0023] As a preferred technical solution of the present invention, the (meth) acrylic acid ester containing a straight-chain alkyl group of C14 or above is selected from any one of tetradecyl acrylate, hexadecyl acrylate, octadecyl acrylate, eicosyl acrylate, behenyl acrylate, tetradecyl methacrylate, hexadecyl methacrylate, octadecyl methacrylate, eicosyl methacrylate or behenyl methacrylate, or a combination of at least two thereof.

[0024] As a preferred technical solution of the present invention, the (meth)acrylate containing a C1-C6 alkyl group is selected from any one of methyl acrylate, ethyl acrylate, butyl acrylate, hexyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate or hexyl methacrylate, or a combination of at least two thereof.

[0025] As a preferred technical solution of the present invention, the functional monomer is selected from any one of acrylic acid, hydroxyethyl acrylate, 4-hydroxybutyl acrylate or 2-hydroxypropyl acrylate, or a combination of at least two thereof.

[0026] In the present invention, the functional monomer mainly introduces hydroxyl or carboxyl groups into the resin molecular chain to improve the film-forming property of the resin.

[0027] As a preferred technical solution of the present invention, the silicon-containing monomer is selected from any one of vinyl triisopropoxy silane, vinyl trimethoxy silane, vinyl triethoxy silane or vinyl tri(β-methoxyethoxy) silane, or a combination of at least two thereof.

[0028] As a preferred technical solution of the present invention, the raw materials for preparing the acrylic resin also include 0.1-0.5 parts by weight of an initiator, for example, 0.1 parts by weight, 0.15 parts by weight, 0.2 parts by weight, 0.25 parts by weight, 0.3 parts by weight, 0.35 parts by weight, 0.4 parts by weight, 0.45 parts by weight or 0.5 parts by weight, etc.

[0029] Preferably, the initiator comprises a free radical initiator.

[0030] Preferably, the free radical initiator is selected from any one of azobisisobutyronitrile, azobisisoheptanenitrile, azobisisovaleronitrile, benzoyl peroxide or tert-butyl peroxyhexahydroterephthalate, or a combination of at least two thereof.

[0031] As a preferred technical solution of the present invention, the raw materials for preparing the acrylic resin also include 150-250 parts by weight of a solvent, for example, 150 parts by weight, 160 parts by weight, 170 parts by weight, 180 parts by weight, 190 parts by weight, 200 parts by weight, 210 parts by weight, 220 parts by weight, 230 parts by weight, 240 parts by weight or 250 parts by weight, etc.

[0032] Preferably, the solvent is selected from any one or a combination of at least two of dimethyl carbonate, ethyl acetate, toluene, isopropanol, methyl acetate, methanol or butanone.

[0033] As a preferred technical solution of the present invention, the raw materials for preparing the acrylic resin include the following components in parts by weight:

[0034]

[0035] As a preferred technical solution of the present invention, the solid content of the acrylic resin is 31-32%, for example, it can be 31%, 31.1%, 31.2%, 31.3%, 31.4%, 31.5%, 31.6%, 31.7%, 31.8%, 31.9% or 32%, etc.

[0036] It should be noted that the solid content of the acrylic resin in the present invention can be measured by the method of GB / T 2793-1995.

[0037] As a preferred technical solution of the present invention, the viscosity of the acrylic resin is 10000-20000 mPa·s, for example, it can be 10000 mPa·s, 11000 mPa·s, 12000 mPa·s, 13000 mPa·s, 14000 mPa·s, 15000 mPa·s, 16000 mPa·s, 17000 mPa·s, 18000 mPa·s, 19000 mPa·s or 20000 mPa·s, etc.

[0038] It should be noted that the viscosity of the acrylic resin in the present invention can be measured using the method of GB / T 21059-2007.

[0039] As a preferred technical solution of the present invention, the weight-average molecular weight of the acrylic resin is 300,000-600,000 (for example, it can be 300,000, 330,000, 360,000, 390,000, 420,000, 450,000, 480,000, 510,000, 540,000, 570,000 or 600,000, etc.), and the polydispersity coefficient is 2.8-4.8 (for example, it can be 2.8, 3.0, 3.2, 3.4, 3.6, 3.8, 4.0, 4.2, 4.4, 4.6 or 4.8, etc.).

[0040] It should be noted that the weight average molecular weight and polydispersity coefficient of the acrylic resin in the present invention can be tested and obtained by the method of GB / T27843-2011.

[0041] Preferably, the melting point (Tm) of the acrylic resin is 35-55°C, for example, it may be 35°C, 36°C, 38°C, 40°C, 42°C, 44°C, 46°C, 48°C, 50°C, 52°C, 54°C or 55°C, etc.

[0042] It should be noted that the melting point of the acrylic resin in the present invention can be measured by the method of GB / T13464-1992.

[0043] In a second aspect, the present invention provides a method for preparing the acrylic resin as described in the first aspect, the preparation method comprising the following steps:

[0044] (1) mixing a (meth)acrylate containing a C14 or higher linear alkyl group and a solvent in a protective gas atmosphere to obtain a mixture;

[0045] (2) adding a (meth)acrylate containing a C1-C6 alkyl group, a functional monomer and a portion of an initiator to the reaction system obtained in step (1) in a protective gas atmosphere to react and obtain a prepolymer;

[0046] (3) Mixing the silicon-containing monomer and the remaining initiator, adding the mixture to the reaction system obtained in step (2), and reacting the mixture to obtain the acrylic resin.

[0047] The present invention designs a method for preparing an acrylic resin and further designs the order of adding each component to prepare an acrylic resin with excellent comprehensive performance. If step (2) and step (3) are mixed, that is, the silicon-containing monomer and the monomer in step (2) are mixed and added to the reaction system, due to the high reactivity of the silicon-containing monomer, the addition in step (2) will cause the silicon-containing monomer to react with the functional monomer in the system in advance, forming local crosslinking, high viscosity or even gel, resulting in poor compatibility, loose bonding with the main acrylic resin structure, and affecting the adhesion of the acrylic resin. .

[0048] As a preferred technical solution of the present invention, the protective gas atmosphere in step (1) and step (2) includes nitrogen.

[0049] As a preferred technical solution of the present invention, the method of adding in step (2) includes dropwise addition.

[0050] Preferably, the temperature of the dripping in step (2) is 70-90°C (for example, it can be 70°C, 72°C, 74°C, 76°C, 78°C, 80°C, 82°C, 84°C, 86°C, 88°C or 90°C, etc.), and the time is 2-5h (for example, it can be 2h, 2.5h, 3h, 3.5h, 4h, 4.5h or 5h, etc.).

[0051] Preferably, the reaction temperature is 70-105°C (for example, 70°C, 75°C, 80°C, 85°C, 90°C, 95°C, 100°C or 105°C, etc.), and the reaction time is 1-2h (for example, 1h, 1.5h or 2h, etc.).

[0052] As a preferred technical solution of the present invention, the reaction temperature in step (3) is 70-105°C (for example, it can be 70°C, 75°C, 80°C, 85°C, 90°C, 95°C, 100°C or 105°C, etc.), and the reaction time is 3-5h (for example, it can be 3h, 3.5h, 4h, 4.5h or 5h, etc.).

[0053] It should be noted that the reaction temperatures in step (2) and step (3) of the present invention may be the same.

[0054] As a preferred technical solution of the present invention, the preparation method specifically comprises the following steps:

[0055] (1) mixing a (meth)acrylate containing a C14 or higher linear alkyl group and a solvent in a protective gas atmosphere to obtain a mixture;

[0056] (2) adding a (meth)acrylate containing a C1-C6 alkyl group, a functional monomer and a portion of an initiator dropwise to the reaction system obtained in step (1) at 70-90° C. under a protective gas atmosphere for 2-5 hours, and reacting at 70-105° C. for 1-2 hours to obtain a prepolymer;

[0057] (3) Mix the silicon-containing monomer and the remaining initiator, add them to the reaction system obtained in step (2), and react at 70-105° C. for 3-5 hours to obtain the acrylic resin.

[0058] Compared with the prior art, the present invention has the following beneficial effects:

[0059] The present invention designs the raw materials for preparing the acrylic resin and prepares the acrylic resin with excellent performance through the coordination of various components. The acrylic resin has a suitable weight-average molecular weight and suitable polydispersity as well as high temperature resistance and high adhesion. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 The infrared spectrum of the acrylic resin provided in Example 1 of the present invention;

[0061] Figure 2 The DSC curve of the acrylic resin provided in Example 1 of the present invention;

[0062] Figure 3 This is a temperature scanning curve of the viscoelasticity characterization of the acrylic resin provided in Example 1 of the present invention. DETAILED DESCRIPTION

[0063] Example 1-Example 10, Comparative Example 1-Comparative Example 4

[0064] Example 1 to Example 10 and Comparative Example 1 to Comparative Example 4 respectively provide an acrylate resin and a preparation method thereof. The raw materials for preparing the acrylate resin are detailed in Tables 1 and 2 below. The amounts of each raw material component in Tables 1 and 2 are all in parts by weight.

[0065] The preparation method of the acrylic resin is as follows:

[0066] (1) Adding a solvent and a (meth)acrylate containing a C14 or higher linear alkyl group in parts by weight into a dry container, heating the container to 66° C. while stirring, and introducing nitrogen for 1.5 hours until all air is exhausted;

[0067] (2) Under a nitrogen atmosphere and a constant temperature of 70° C., a (meth)acrylate containing a C1-C6 alkyl group, a functional monomer, and a portion of a free radical initiator (50 wt % of the total free radical initiator) were uniformly mixed and continuously added dropwise to a reaction kettle for 2 h. After the addition was completed, the temperature was raised to 75° C. and the reaction was continued for 1 h;

[0068] (3) adding the silicon-containing monomer and the remaining free radical initiator into the reaction system, reacting at 80° C. for 5 hours, and cooling to below 40° C. to obtain the acrylic resin.

[0069] Table 1

[0070]

[0071] Table 2

[0072]

[0073]

[0074] Comparative Example 5

[0075] This comparative example provides an acrylate resin and a preparation method thereof, which is different from Example 1 only in that the preparation method of the acrylate resin is as follows:

[0076] (1) Adding a solvent and a (meth)acrylate containing a C14 or higher linear alkyl group in parts by weight into a dry container, heating the container to 66° C. while stirring, and introducing nitrogen for 1.5 hours until all air is exhausted;

[0077] (2) Under a nitrogen atmosphere and a constant temperature of 70° C., a (methyl)acrylate containing a C1-C6 alkyl group, a functional monomer, a silicon-containing monomer, and a free radical initiator are uniformly mixed and continuously added dropwise to a reaction kettle for 2 hours. After the addition is completed, the temperature is raised to 75° C. and the reaction is continued for 6 hours, and then the temperature is lowered to below 40° C. to obtain the acrylic resin.

[0078] The acrylate resin provided in Example 1 of the present invention was characterized using a Fourier transform infrared spectrometer, and its infrared spectrum is shown in FIG. Figure 1 As shown. Figure 1 It can be seen that 1728cm -1 The carbonyl characteristic peaks of acrylic acid and methacrylic acid are at 1640 cm -1 There is no characteristic peak of C=C at 1117cm -1 The peak at the center is the stretching vibration peak of the Si-O bond, indicating that all C=C of the silicon-containing monomer participates in the reaction and copolymerizes to form a Si-OC chemical bond. The above indicates that the silicon-containing monomer and acrylate form a copolymer.

[0079] The DSC curve of the acrylic resin provided in Example 1 of the present invention was characterized using a differential scanning calorimeter. The DSC curve is as follows: Figure 2 As shown. Figure 2 It can be seen that the crystallization peak temperature of acrylic resin is 40.6°C and the melting peak temperature (T m ) is 52.2℃.

[0080] In shear mode, 0.15% strain, temperature sweep frequency of 1 Hz, from 20°C to 140°C, the viscoelasticity characterization-temperature sweep curve of the acrylic resin provided in Example 1 of the present invention was characterized using an instrument of equipment manufacturer metravib, model dma+100. The test results are as follows: Figure 3 As shown. Figure 3 It can be seen that the storage modulus of the acrylic resin is 3.6 MPa at 40°C and 0.1 MPa at 45°C, indicating that the acrylic resin undergoes a phase transition at 40°C to 45°C.

[0081] The properties of the acrylic resins provided in the above examples and comparative examples were characterized, and the specific characterization method is as follows:

[0082] Solid content: GB / T 2793-1995;

[0083] Viscosity: GB / T 21059-2007;

[0084] Melting point (T m ): GB / T13464-1992;

[0085] Weight average molecular weight, number average molecular weight, polydispersity: GB / T 27843-2011

[0086] Adhesion: Tested in accordance with GB / T 9286-1998, the adhesion level ranges from 0 to 5, with 0 being the best and 5 being the worst;

[0087] Temperature resistance: The acrylic resin provided in the above embodiments and comparative examples was coated on a SUS plate and placed in a 120°C oven (model DHG-9146A) for 12 hours. After cooling to room temperature, the acrylic resin was peeled off and observed to see if there was any residual glue left. If there was no residual glue, it was recorded as ○; if there was residual glue, it was recorded as ×.

[0088] The above performance test method is shown in Table 3 below:

[0089] Table 3

[0090]

[0091]

[0092] In Table 1, “ / ” indicates that the data was not obtained through testing.

[0093] As can be seen from the above content, the present invention designs the raw materials for preparing the acrylic resin, through the coordination of various components, further through the reaction of (meth)acrylate containing a straight-chain alkyl group of C14 or above, (meth)acrylate containing a C1-C6 alkyl group, a functional monomer and a silicon-containing monomer, and controls the amount of each component within a specific range, to prepare an acrylic resin with excellent performance. The acrylic resin has a suitable weight-average molecular weight and adapted polydispersity, as well as high temperature resistance and high adhesion. The weight-average molecular weight is 300,000-600,000, the polydispersity coefficient is 2.8-4.8, the melting point is 35-55°C, the adhesion grade is not less than grade 1, and there is no residual glue after the temperature resistance test (120°C@12h).

[0094] It can be seen from the contents of Example 1, Examples 9-10, and Comparative Examples 1-2 that the present invention prepares an acrylate resin with excellent performance by controlling the amount of the silicon-containing monomer within a specific range, thereby improving the temperature resistance and adhesion of the acrylate resin.

[0095] It can be seen from the contents of Example 1 and Comparative Examples 3-4 that the present invention prepares an acrylate resin with a suitable melting point by selecting (meth)acrylate containing a C14 or higher linear alkyl group as one of the raw materials for preparing the acrylate resin.

[0096] It can be seen from the contents of Example 1 and Comparative Example 5 that the present invention designs a method for preparing acrylate and further adjusts the order of adding silicon-containing monomers to prepare an acrylate resin with excellent performance, so that the acrylate resin has a suitable weight-average molecular weight and improves the adhesion of the acrylate resin.

[0097] In summary, the present invention designs the raw materials for preparing the acrylic resin, cooperates with each component, and controls the amount of each component within a specific range to prepare an acrylic resin with excellent performance. The acrylic resin has a suitable weight-average molecular weight and adapted polydispersity as well as high temperature resistance and high adhesion.

[0098] The applicant declares that the present invention illustrates the detailed process flow of the present invention through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned detailed process flow, that is, it does not mean that the present invention must rely on the above-mentioned detailed process flow to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of various raw materials of the product of the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. An acrylate resin, characterized in that The raw materials for preparing the acrylic resin include the following components in parts by weight:

2. The acrylic resin according to claim 1, characterized in that The (meth) acrylic acid ester containing a C14 or higher straight-chain alkyl group is selected from any one of tetradecyl acrylate, hexadecyl acrylate, octadecyl acrylate, eicosyl acrylate, behenyl acrylate, tetradecyl methacrylate, hexadecyl methacrylate, octadecyl methacrylate, eicosyl methacrylate, and behenyl methacrylate, or a combination of at least two thereof; Preferably, the (meth)acrylate containing a C1-C6 alkyl group is selected from any one of methyl acrylate, ethyl acrylate, butyl acrylate, hexyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate or hexyl methacrylate, or a combination of at least two thereof.

3. The acrylate resin according to claim 1 or 2, characterized in that: The functional monomer is selected from any one or a combination of at least two of acrylic acid, hydroxyethyl acrylate, 4-hydroxybutyl acrylate or 2-hydroxypropyl acrylate; Preferably, the silicon-containing monomer is selected from any one of vinyl triisopropoxy silane, vinyl trimethoxy silane, vinyl triethoxy silane or vinyl tri(β-methoxyethoxy) silane, or a combination of at least two thereof.

4. The acrylate resin according to any one of claims 1 to 3, characterized in that The raw materials for preparing the acrylic resin also include 0.1-0.5 parts by weight of an initiator; Preferably, the initiator comprises a free radical initiator; Preferably, the free radical initiator is selected from any one of azobisisobutyronitrile, azobisisoheptanenitrile, azobisisovaleronitrile, benzoyl peroxide or tert-butyl peroxyhexahydroterephthalate, or a combination of at least two thereof.

5. The acrylate resin according to any one of claims 1 to 4, characterized in that The raw materials for preparing the acrylic resin also include 150-250 parts by weight of a solvent; Preferably, the solvent is selected from any one or a combination of at least two of dimethyl carbonate, ethyl acetate, toluene, isopropanol, methyl acetate, methanol or butanone; Preferably, the solid content of the acrylic resin is 31-32%; Preferably, the viscosity of the acrylic resin is 10000-20000 mPa·s.

6. The acrylate resin according to any one of claims 1 to 5, characterized in that The weight average molecular weight of the acrylic resin is 300,000-600,000, and the polydispersity coefficient is 2.8-4.8; Preferably, the melting point of the acrylic resin is 35-55°C.

7. A method for preparing an acrylate resin according to any one of claims 1 to 6, characterized in that: The preparation method comprises the following steps: (1) mixing a (meth)acrylate containing a C14 or higher linear alkyl group and a solvent in a protective gas atmosphere to obtain a mixture; (2) adding a (meth)acrylate containing a C1-C6 alkyl group, a functional monomer and a portion of an initiator to the reaction system obtained in step (1) in a protective gas atmosphere to react and obtain a prepolymer; (3) Mixing the silicon-containing monomer and the remaining initiator, adding the mixture to the reaction system obtained in step (2), and reacting the mixture to obtain the acrylic resin.

8. The preparation method according to claim 7, characterized in that: The method of adding in step (2) comprises dropwise addition; Preferably, the temperature of the dropwise addition in step (2) is 70-90° C. and the time is 2-5 h; Preferably, the reaction temperature is 70-105°C and the reaction time is 1-2h.

9. The preparation method according to claim 7 or 8, characterized in that: The reaction temperature of step (3) is 70-105°C and the reaction time is 3-5h.

10. The preparation method according to any one of claims 7 to 9, characterized in that: The preparation method specifically comprises the following steps: (1) mixing a (meth)acrylate containing a C14 or higher linear alkyl group and a solvent in a protective gas atmosphere to obtain a mixture; (2) adding a (meth)acrylate containing a C1-C6 alkyl group, a functional monomer and a portion of an initiator dropwise to the reaction system obtained in step (1) at 70-90° C. under a protective gas atmosphere for 2-5 hours, and reacting at 70-105° C. for 1-2 hours to obtain a prepolymer; (3) Mix the silicon-containing monomer and the remaining initiator, add them to the reaction system obtained in step (2), and react at 70-105° C. for 3-5 hours to obtain the acrylic resin.

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