Polymer, preparation method thereof and coating composition
By using amphiphilic polymers as leveling agents, the leveling time problem of optical plastic transparent parts coatings on curved surfaces is solved, rapid leveling and good optical properties are achieved, light distortion is avoided, and it is suitable for transparent parts with complex curvatures.
Patent Information
- Application Number
- CN202510937133.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-08
- Publication Date
- 2025-09-23
AI Technical Summary
Existing optical plastic transparent coatings have the problem of too long or too short leveling time on curved surfaces, resulting in optical defects such as orange peel, ripples, flow marks, etc., which affect the pilot's observation effect and are difficult to apply on complex curvatures.
Using polymers with amphiphilic structures as leveling agents can quickly migrate to the surface of the wet film to form a monomolecular layer, using high surface tension to provide leveling power, reducing the leveling time of the coating, making the leveling time close to or less than the flow time, and avoiding light distortion.
The rapid leveling of the coating is achieved, optical defects are eliminated, and the optical performance of the coating is ensured to be good without affecting the pilot's observation effect.
Smart Images
Figure CN120682433A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of coating technology, and in particular to a polymer, a preparation method thereof, and a coating composition. Background Art
[0002] The function of aircraft transparent components is to seal the cockpit, providing the pilot with a comfortable, enclosed, spacious, and brightly lit space. These components protect the pilot from the impact of high-speed airflow and the external environment, providing an excellent field of view for completing various flight missions. Modern aircraft transparent components are often manufactured using integrally molded optical plastics. While these plastics offer numerous advantages over glass, such as light weight, strong impact resistance, and low production costs, they also have significant drawbacks: their soft texture and poor scratch resistance. Applying a wear-resistant polyurethane protective coating to the surface of organic glass overcomes these drawbacks, such as poor wear resistance and susceptibility to scratching.
[0003] As optical components, protective coatings for transparent parts have extremely high requirements for optical defect control. The presence of optical defects such as flow marks causes light distortion, seriously affecting pilots' quick and accurate observation of the external environment and making it difficult to effectively complete various operations and responses. Good optical leveling is a prerequisite for protective coatings used on transparent parts.
[0004] Ordinary paints cannot achieve optical leveling when applied on curved transparent parts. Even if they appear smooth and transparent to the naked eye, optical defects such as orange peel, ripples, and flow marks will still exist under small-angle projection of a slide projector, causing light distortion and thus deforming the image, hindering the pilot's accurate judgment and, in more serious cases, causing dizziness in the pilot.
[0005] The current problem with curved optical coatings is that the leveling time is greater than the flow time, preventing the coating from achieving adequate leveling, resulting in optical defects such as orange peel, ripples, and flow marks. This problem can be solved by extending or reducing the flow time. Optical layer preparation requires rapid surface drying after coating to reduce the risk of dust embedding, and extending the flow time also increases the surface drying time. On the other hand, excessive flow time can result in insufficient coating thickness, failing to meet the requirements for protective coatings. Simply extending the flow time cannot resolve the leveling issue. Conventional wood paints, car paints, and varnishes, which have low optical requirements, are difficult to apply to transparent parts with complex curvatures.
[0006] Therefore, it is an urgent problem for those skilled in the art to develop a leveling agent that can reduce the leveling time of the coating, make the leveling time close to the flow time or less than the flow time, and have good leveling performance of the coating prepared after coating without producing light distortion. Summary of the Invention
[0007] In light of this, the present application provides a polymer with an amphiphilic structure. When used as a leveling agent, it can rapidly migrate to the surface of a wet film, forming a monolayer there. Leveraging its high surface tension, it provides the driving force for leveling high-viscosity wet films. This polymer can reduce the coating's leveling time, bringing it close to or less than the flow time, resolving the conflicting requirements of optical components for coating flow time. The resulting coating exhibits excellent leveling performance and produces no optical distortion.
[0008] The present application provides a polymer having a structure of Formula 1:
[0009]
[0010] Wherein n is an integer from 1 to 100, and can be 1, 2, 5, 10, 15, 20, 25, 30, 40, 50, 60, 70, 80, 90, 95, or 100.
[0011] In some specific implementations, n is an integer from 2 to 20.
[0012] In some specific implementations, the number average molecular weight of the polymer is 600-10,000, and can be 700, 800, 900, 1,000, 2,000, 3,000, 4,000, 5,000, 6,000, 7,000, 8,000, 9,000, or 10,000. In some specific implementations, the weight average molecular weight of the polymer is 3,000 to 10,000.
[0013] The present application also provides a method for preparing a polymer, comprising:
[0014] The HDI trimer, functional ionic liquid and catalyst are reacted to obtain an ionic liquid with double NCO groups;
[0015] The ionic liquid with double NCO groups, 1,4-butanediol, functional ionic liquid and catalyst are polymerized to obtain a polymer.
[0016]
[0017] The present application first reacts HDI trimer, functional ionic liquid and catalyst to obtain an ionic liquid with a double NCO group. Selecting HDI trimer can prevent yellowing during use. In some specific implementations, the functional ionic liquid includes but is not limited to one or more ionic liquids containing reactive groups such as 1-hydroxyethyl-3-methylimidazolium chloride, 1-hydroxyethyl-3-methylimidazolium tetrafluoroborate, 1-hydroxyethyl-3-methylimidazolium hexafluorophosphate or 1-hydroxyethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt. The present application has no special requirements for the selection of functional ionic liquids. In some specific implementations, the molar ratio of HDI trimer to functional ionic liquid in the reaction is 1:(0.8-1.2), which can be 1:0.8, 1:0.9, 1:1, 1:1.1, or 1:1.2. In some specific implementations, the reaction temperature is 50° C. to 100° C., and the reaction time is 2 h to 10 h. The reaction is carried out in the presence of a solvent, and the solvent includes a non-reactive solvent such as cyclohexanone.
[0018] The present application then performs a polymerization reaction on an ionic liquid containing bis-NCO groups, 1,4-butanediol, a functional ionic liquid, and a catalyst to obtain a polymer. In some specific implementations, the molar ratio of the ionic liquid containing bis-NCO groups to the functional ionic liquid in the polymerization reaction is (0.5-50):1, which can be 0.5:, 1:1, 2:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, 10:1, etc.; the molar ratio of the ionic liquid containing bis-NCO groups to 1,4-butanediol is 2:(1-2), which can be 2:1, 3:2, 4:3, 5:4, 6:5, etc. The catalyst includes but is not limited to a tertiary amine catalyst and / or an organotin catalyst; the tertiary amine catalyst includes but is not limited to one or more of triethylamine, diethylenetriamine, dimethylhexadecylamine, triethylenediamine, triethanolamine, methyldiethanolamine, dimethylethanolamine or pyridine, and the present application has no special requirements for the selection of tertiary amine catalysts; the organotin catalyst includes but is not limited to one or more of dibutyltin dilaurate, stannous octoate or triethylenediamine, and the present application has no special requirements for the selection of organotin catalysts. In some specific implementations, the mass ratio of the ionic liquid with a di-NCO group to the catalyst in the polymerization reaction is (50-1000):1. In some specific implementations, the temperature of the polymerization reaction is 50°C to 80°C, and the time of the polymerization reaction is 5h to 8h.
[0019] The present application also provides a coating composition, comprising a leveling agent, wherein the leveling agent is the above-mentioned polymer or a polymer prepared by the above-mentioned preparation method.
[0020] In some specific implementations, the coating composition includes a first component and a second component; the first component includes, by weight, 20 to 30 parts of a polyol, 1 to 3 parts of a chain extender, 0.05 to 0.1 parts of a catalyst, 0.05 to 0.15 parts of a leveling agent, 0.01 to 0.03 parts of a wetting agent, 0.1 to 0.3 parts of an antioxidant, 0.1 to 0.3 parts of a UV absorber, 0.1 to 0.3 parts of a light stabilizer, and 40 to 80 parts of a solvent; the second component includes, by weight, 10 to 20 parts of an aliphatic diisocyanate or trimer. The first component includes the polyol. In some specific implementations, the polyol includes, but is not limited to, polycaprolactone diol. This application has no specific requirements for the selection of the polyol. The polyol is present in an amount of 20 to 30 parts by weight, and may be 20, 25, or 30 parts. The first component includes the chain extender. In some specific implementations, the chain extender includes, but is not limited to, butanediol. This application has no specific requirements for the selection of the chain extender. The weight fraction of the chain extender is 1 to 3 parts, and may be 1, 2, or 3 parts. The first component includes a catalyst. In some specific implementations, the catalyst includes, but is not limited to, dibutyltin dilaurate. This application has no specific requirements for the selection of the catalyst. The weight fraction of the catalyst is 0.05 to 0.1 parts, and may be 0.05 or 0.1 parts. The first component includes the aforementioned leveling agent. The weight fraction of the leveling agent is 0.05 to 0.15 parts, and may be 0.05, 0.1, or 0.15 parts. The first component includes a wetting agent. In some specific implementations, the wetting agent includes, but is not limited to, Silok 8035. This application has no specific requirements for the selection of the wetting agent. The weight fraction of the wetting agent is 0.01 to 0.03 parts, and may be 0.01, 0.02, or 0.03 parts. The first component includes an antioxidant. In some specific implementations, the antioxidant includes but is not limited to Irganox 1010. This application has no specific requirements for the selection of the antioxidant. The weight fraction of the antioxidant is 0.1 to 0.3 parts, and may be 0.1 parts, 0.2 parts, or 0.3 parts. The first component includes a UV absorber. In some specific implementations, the UV absorber includes but is not limited to Tinuvin 328. This application has no specific requirements for the selection of the UV absorber. The weight fraction of the UV absorber is 0.1 to 0.3 parts, and may be 0.1 parts, 0.2 parts, or 0.3 parts. The first component includes a light stabilizer. In some specific implementations, the light stabilizer includes but is not limited to UV770. This application has no specific requirements for the selection of the light stabilizer. The weight fraction of the light stabilizer is 0.1 to 0.3 parts, and may be 0.1 parts, 0.2 parts, or 0.3 parts. The first component includes a solvent.In some specific implementations, the solvent includes but is not limited to butyl acetate. This application has no special requirements for the selection of the solvent. The weight fraction of the solvent is 40 to 80 parts, and can be 40 parts, 50 parts, 60 parts, 70 parts, or 80 parts. The second component includes an aliphatic diisocyanate or trimer, and the weight fraction is 10 to 20 parts, and can be 10 parts, 12 parts, 15 parts, 18 parts, or 20 parts.
[0021] In some specific implementations, the coating composition includes, by mass, 40 to 50 parts of Nobin Varnish A, 40 to 50 parts of Nobin Varnish B, 20 to 30 parts of diluent, and 0.1 to 1 part of leveling agent. The coating composition includes Nobin Varnish A in 40 to 50 parts by mass, which can be 40 parts, 42 parts, 45 parts, 48 parts, or 50 parts. The coating composition includes Nobin Varnish B in 40 to 50 parts by mass, which can be 40 parts, 42 parts, 45 parts, 48 parts, or 50 parts. The coating composition includes a diluent. In some specific implementations, the diluent includes but is not limited to a diluent supporting Nobin Varnish. This application has no special requirements for the selection of the diluent. The diluent is in 20 to 30 parts by mass, which can be 20 parts, 22 parts, 25 parts, 28 parts, or 30 parts. The coating composition includes the aforementioned leveling agent in an amount ranging from 0.1 to 1 part by weight, and may include 0.1, 0.2, 0.5, 0.8, or 1 part by weight. In some specific implementations, the coating composition can be used for a polyurethane protective coating. In some specific implementations, the mass ratio of Nobi Clearcoat A to Nobi Clearcoat B is 2:1.
[0022] The polymer provided in the present application has an amphiphilic structure and can quickly migrate to the surface of a wet film when used as a leveling agent, forming a monomolecular layer on the surface of the film. Its higher surface tension can provide leveling power for high-viscosity wet films. The leveling time of the coating can be reduced, making the leveling time close to or less than the flow time, thereby resolving the contradictory requirements of optical components for the flow time of the coating. The coating prepared after coating has good leveling performance and does not produce optical distortion. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 This is the NMR spectrum of the polymer provided in Example 1 of the present application;
[0024] Figure 2 This is the GPC test spectrum of the polymer provided in Example 1 of the present application;
[0025] Figure 3 This is a diagram showing the coating effects of the coating compositions provided in Examples 1-3 and Comparative Examples 1-4 of the present application. DETAILED DESCRIPTION
[0026] It should be understood that the expression "one or more of" includes individually each of the items recited after the expression and various combinations of two or more of the recited items, unless otherwise apparent from the context and usage. The expression "and / or" in conjunction with three or more recited items should be understood to have the same meaning, unless otherwise apparent from the context.
[0027] The terms "comprising", "having" or "containing", including their grammatical synonyms, should generally be understood as open and non-restrictive, e.g., not excluding other unrecited elements or steps, unless otherwise specifically stated or understood from the context.
[0028] It should be understood that the order of steps or the order in which certain actions are performed is not important as long as the application remains operable. Additionally, two or more steps or actions may be performed simultaneously.
[0029] The use of any and all examples or exemplary language, such as "such as" or "including," herein is intended merely to better illustrate the present application and does not limit the scope of the present application unless otherwise claimed. No language in this specification should be construed as indicating any non-claimed element as essential to the practice of the present application.
[0030] In addition, the numerical ranges and parameters used to define this application are approximate values. The relevant numerical values in the specific examples have been presented as accurately as possible. However, any numerical value inherently inevitably contains standard deviations due to individual testing methods. Therefore, unless otherwise expressly stated, all ranges, amounts, values, and percentages used in this disclosure should be understood to be modified by the word "about." As used herein, "about" generally means that the actual value is within plus or minus 10%, 5%, 1%, or 0.5% of a particular value or range.
[0031] The present application provides a polymer having a structure of Formula 1:
[0032]
[0033] Wherein n is an integer from 1 to 100.
[0034] The polymer provided in the present application has an amphiphilic structure and can quickly migrate to the surface of a wet film when used as a leveling agent, forming a monomolecular layer on the surface of the film. Its higher surface tension can provide leveling power for high-viscosity wet films. The leveling time of the coating can be reduced, making the leveling time close to or less than the flow time, thereby resolving the contradictory requirements of optical components for the flow time of the coating. The coating prepared after coating has good leveling performance and does not produce optical distortion.
[0035] The present application is further described below with reference to the following examples. The scope of protection of the present application is not limited by the following examples.
[0036] Example 1
[0037] This embodiment provides a polymer having a structure of Formula 1. The preparation method of the polymer includes:
[0038] Weigh 30.18 parts of HDI trimer and 50 parts of anhydrous cyclohexanone into a reaction vessel, place in an oil bath at 90°C under nitrogen protection, add 19.82 parts of 1-hydroxyethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt dropwise, and react for 6-10 hours after the addition is complete to obtain an ionic liquid with a bis-NCO group;
[0039] Weigh 89.70 parts of ionic liquid with double NCO groups, 3.15 parts of 1,4-butanediol, 7.10 parts of 1-hydroxyethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt, and 0.05 parts of dibutyltin dilaurate as catalyst, protect with nitrogen, and react at 60°C for 6 hours to obtain a polymer with medium molecular weight; perform nuclear magnetic resonance (NMR) test on the obtained polymer, and the NMR spectrum is as shown below. Figure 1 The obtained polymer was subjected to GPC test, and the GPC spectrum was as shown. Figure 2 shown.
[0040] This embodiment also provides a coating composition, which includes, by mass: 25.15 parts of polycaprolactone diol (PCL210N), 2.88 parts of 1,2,4-butanetriol, 0.06 parts of dibutyltin dilaurate as a catalyst, 0.12 parts of the polymer provided in this embodiment as a leveling agent, 0.02 parts of a wetting agent, 0.2 parts of an antioxidant, 0.2 parts of an ultraviolet absorber, 0.2 parts of a light stabilizer, 23.12 parts of butyl acetate, 34.68 parts of N,N-dimethylformamide, and 13.38 parts of isophorone diisocyanate.
[0041] The preparation method of the coating composition comprises:
[0042] Polycaprolactone diol (PCL210N), 1,2,4-butanetriol, catalyst dibutyltin dilaurate, leveling agent, wetting agent antioxidant, UV absorber, light stabilizer, butyl acetate, N,N-dimethylformamide, isophorone diisocyanate and aliphatic diisocyanate are poured into a stirred reactor, the temperature is controlled at 20°C for reaction for 2 hours, and the mixture is allowed to stand for 30 minutes to remove bubbles. The coating is applied to the organic glass by vertical flow coating at 20°C. After leveling and surface drying, the product is transferred to a blast drying oven for curing to obtain a coating composition.
[0043] Example 2
[0044] This embodiment provides a polymer having a structure of Formula 1. The preparation method of the polymer includes:
[0045] Weigh 30.18 parts of HDI trimer and 50 parts of anhydrous cyclohexanone into a reaction vessel, place in an oil bath at 90°C under nitrogen protection, add 19.82 parts of 1-hydroxyethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt dropwise, and react for 6-10 hours after the addition is complete to obtain an ionic liquid with a bis-NCO group;
[0046] Weigh 89.70 parts of an ionic liquid containing a bis-NCO group, 3.15 parts of 1,4-butanediol, 7.1 parts of 1-hydroxyethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, and 0.05% of a catalyst, dibutyltin dilaurate, under nitrogen protection, and react at 60°C for 6 hours to obtain a polymer with a medium molecular weight;
[0047] This embodiment also provides a coating composition, which includes, by mass: 21.25 parts of polycaprolactone triol (CAPA3091), 1.06 parts of 1,4-butanediol, 0.06 parts of dibutyltin dilaurate as a catalyst, 0.12 parts of the polymer provided in this embodiment as a leveling agent, 0.02 parts of a wetting agent, 0.2 parts of an antioxidant, 0.2 parts of an ultraviolet absorber, 0.2 parts of a light stabilizer, 23.12 parts of butyl acetate, 34.68 parts of N,N-dimethylformamide, and 19.10 parts of an HDI trimer.
[0048] The preparation method of the coating composition comprises:
[0049] Polycaprolactone triol (CAPA3091), 1,4-butanediol, catalyst dibutyltin dilaurate, leveling agent, wetting agent antioxidant, UV absorber, light stabilizer, butyl acetate, N,N-dimethylformamide, isophorone diisocyanate and aliphatic diisocyanate are poured into a stirred reactor, the temperature is controlled at 20°C for reaction for 2 hours, and the mixture is allowed to stand for 30 minutes to remove bubbles. The coating is applied to the organic glass by vertical flow coating at 20°C. After leveling and surface drying, the product is transferred to a blast drying oven for curing to obtain a coating composition.
[0050] Example 3
[0051] This embodiment provides a polymer having a structure of Formula 1. The preparation method of the leveling agent includes:
[0052] Weigh 30.18 parts of HDI trimer and 50 parts of anhydrous cyclohexanone into a reaction vessel, place in an oil bath at 90°C under nitrogen protection, add 19.82 parts of 1-hydroxyethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt dropwise, and react for 6-10 hours after the addition is complete to obtain an ionic liquid with a bis-NCO group;
[0053] Weigh 89.70 parts of an ionic liquid containing a bis-NCO group, 3.15 parts of 1,4-butanediol, 7.1 parts of 1-hydroxyethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, and 0.05% of a catalyst, dibutyltin dilaurate, under nitrogen protection, and react at 60°C for 6 hours to obtain a polymer with a medium molecular weight;
[0054] This embodiment also provides a coating composition, which includes, by mass: 49.8 parts of Nobin 101 Varnish A, 24.9 parts of Nobin 101 Varnish B, 0.4 parts of the polymer provided in this embodiment as a leveling agent, and 24.9 parts of a diluent.
[0055] The preparation method of the coating composition comprises:
[0056] Pour NOBIN 101 Varnish A, NOBIN 101 Varnish B, a leveling agent, and a diluent into a stirred reactor, control the temperature at 21°C to react for 2 hours, let it stand for 30 minutes to remove bubbles, and apply the coating to organic glass by vertical flow coating at 21°C. After leveling and surface drying for 2-6 hours, transfer the product to a forced air drying oven for curing at 70°C for 24 hours to obtain a coating composition.
[0057] Example 4
[0058] This embodiment provides a polymer having a structure of Formula 1. The preparation method of the polymer includes:
[0059] Weigh 30.18 parts of HDI trimer and 50 parts of anhydrous cyclohexanone into a reaction vessel, place in an oil bath at 90°C under nitrogen protection, add 19.82 parts of 1-hydroxyethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt dropwise, and react for 6-10 hours after the addition is complete to obtain an ionic liquid with a bis-NCO group;
[0060] Weigh 89.70 parts of an ionic liquid with a bis-NCO group, 3.15 parts of 1,4-butanediol, 7.1 parts of 1-hydroxyethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, and 0.05 parts of a catalyst, dibutyltin dilaurate, and react at 60°C for 6 hours under nitrogen protection to obtain a polymer with a medium molecular weight.
[0061] This embodiment also provides a coating composition, which includes, by mass: 49.8 parts of Nobin 102 varnish A, 24.9 parts of Nobin 102 varnish B, 0.4 parts of the polymer provided in this embodiment as a leveling agent, and 24.9 parts of a diluent.
[0062] The preparation method of the coating composition comprises:
[0063] Pour NOBIN 102 varnish A, NOBIN 102 varnish B, leveling agent and diluent into a stirred reactor, control the temperature at 21°C to react for 2 hours, let it stand for 30 minutes to remove bubbles, and apply the coating to organic glass by vertical flow coating at 21°C. After leveling and surface drying for 2-6 hours, transfer the product to a forced air drying oven for curing at 70°C for 24 hours to obtain a coating composition.
[0064] Comparative Example 1
[0065] This comparative example provides a coating composition, which comprises, by mass, 50 parts of Nobi 101 varnish A, 25 parts of Nobi 101 varnish B, and 25 parts of a diluent.
[0066] The preparation method of the coating composition comprises:
[0067] A mixture of Nobin 101 Varnish A, Nobin 101 Varnish B and a diluent was poured into a stirred reactor, the reaction was carried out at a temperature of 21°C for 2 hours, and the mixture was allowed to stand for 30 minutes to remove bubbles. The coating was then applied to the organic glass by vertical flow coating at 21°C. After leveling and surface drying for 2-6 hours, the product was transferred to a forced air drying oven for curing at 70°C for 24 hours to obtain a coating composition.
[0068] Comparative Example 2
[0069] This comparative example provides a coating composition, which includes, by mass, 50 parts of Nobin 102 varnish A, 25 parts of Nobin 102 varnish B, and 25 parts of diluent.
[0070] The preparation method of the coating composition comprises:
[0071] A mixture of Nobin 101 Varnish A, Nobin 101 Varnish B and a diluent was poured into a stirred reactor, the reaction was carried out at a temperature of 21°C for 2 hours, and the mixture was allowed to stand for 30 minutes to remove bubbles. The coating was then applied to the organic glass by vertical flow coating at 21°C. After leveling and surface drying for 2-6 hours, the product was transferred to a forced air drying oven for curing at 70°C for 24 hours to obtain a coating composition.
[0072] Comparative Example 3
[0073] This comparative example provides a coating composition, which differs from Example 2 only in that the leveling agent is replaced with a structure of Formula 3; the composition comprises, by mass, 49.8 parts of Nobin 101 Varnish A, 24.9 parts of Nobin 101 Varnish B, 0.4 parts of the polymer provided in this example as a leveling agent (structure of Formula 3), and 24.9 parts of a diluent.
[0074] The preparation method of the coating composition comprises:
[0075] Pour NOBIN 101 Varnish A, NOBIN 101 Varnish B, a leveling agent, and a diluent into a stirred reactor, control the temperature at 21°C to react for 2 hours, let it stand for 30 minutes to remove bubbles, and apply the coating to organic glass by vertical flow coating at 21°C. After leveling and surface drying for 2-6 hours, transfer the product to a forced air drying oven for curing at 70°C for 24 hours to obtain a coating composition.
[0076]
[0077] The coating compositions provided in Examples 1-4 and Comparative Examples 1-3 were subjected to performance tests using the following methods:
[0078] Light transmittance: GBT 2410-2008;
[0079] Haze: GBT 2410-2008;
[0080] Leveling status: Project the slide at a 30° angle and evaluate visually;
[0081] Haze increase after Taber 100 stroke treatment: ASTM F735.
[0082] The coating effects of the coating compositions provided in Examples 1-4 and Comparative Examples 1-3 are as follows: Figure 3 As shown (a is Example 1, b is Example 2, c is Example 3, d is Example 4, e is Comparative Example 1, f is Comparative Example 2, and g is Comparative Example 3).
[0083] The test results are shown in Table 1:
[0084] Table 1
[0085]
[0086] The above is only a preferred specific implementation method of the present application, but the scope of protection of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solution and application concept of the present application within the technical scope disclosed in the present application, and they should be covered by the scope of protection of the present application.
Claims
1. A polymer, characterized in that Having the structure of formula 1: Wherein n is an integer from 1 to 100.
2. The polymer according to claim 1, characterized in that Said n is an integer of 2-20.
3. The polymer according to claim 1, characterized in that The number average molecular weight of the polymer is 600-10,000.
4. A method for preparing a polymer, characterized in that: include: The HDI trimer, functional ionic liquid and catalyst are reacted to obtain an ionic liquid with double NCO groups; The ionic liquid with double NCO groups, 1,4-butanediol, functional ionic liquid and catalyst are polymerized to obtain a polymer.
5. The preparation method according to claim 4, characterized in that The functional ionic liquid includes one or more of 1-hydroxyethyl-3-methylimidazolium chloride, 1-hydroxyethyl-3-methylimidazolium tetrafluoroborate, 1-hydroxyethyl-3-methylimidazolium hexafluorophosphate or 1-hydroxyethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide; the catalyst includes a tertiary amine catalyst and / or an organic tin catalyst; the tertiary amine catalyst includes one or more of triethylamine, diethylenetriamine, dimethylhexadecylamine, triethylenediamine, triethanolamine, methyldiethanolamine, dimethylethanolamine or pyridine; the organic tin catalyst includes one or more of dibutyltin dilaurate, stannous octoate or triethylenediamine.
6. The preparation method according to claim 4, characterized in that The molar ratio of the HDI trimer to the functional ionic liquid in the reaction is 1:(0.8-1.2); the molar ratio of the ionic liquid with a di-NCO group to the functional ionic liquid in the polymerization reaction is (0.5-50):1; and the molar ratio of the ionic liquid with a di-NCO group to 1,4-butanediol is 2:(1-2).
7. The preparation method according to claim 4, characterized in that The reaction temperature is 50°C to 100°C, and the reaction time is 2h to 10h; the reaction is carried out in the presence of a solvent, and the solvent includes cyclohexanone; the polymerization reaction temperature is 50°C to 80°C, and the polymerization reaction time is 5h to 8h.
8. A coating composition, characterized in that The invention comprises a leveling agent, wherein the leveling agent is the polymer according to any one of claims 1 to 3 or the polymer prepared by the preparation method according to any one of claims 4 to 7.
9. The coating composition according to claim 8, characterized in that The coating composition comprises a first component and a second component; The first component comprises, by mass, 20 to 30 parts of polyol, 1 to 3 parts of chain extender, 0.05 to 0.1 parts of catalyst, 0.05 to 0.15 parts of leveling agent, 0.01 to 0.03 parts of wetting agent, 0.1 to 0.3 parts of antioxidant, 0.1 to 0.3 parts of UV absorber, 0.1 to 0.3 parts of light stabilizer and 40 to 80 parts of solvent; the second component comprises, by mass, 10 to 20 parts of aliphatic diisocyanate or trimer.
10. The coating composition according to claim 8, characterized in that The coating composition comprises, by mass, 40 to 50 parts of Nobin varnish A, 40 to 50 parts of Nobin varnish B, 20 to 30 parts of a diluent, and 0.1 to 1 part of a leveling agent.