A tunnel brightening coating composition

Abstract

This application relates to the field of tunnel brightening coating technology, specifically providing a tunnel brightening coating composition, comprising component A and component B in a weight ratio of 1:0.05-0.4. Component A, by weight, includes: 10-30 parts of epoxy-terminated polysiloxane, 100 parts of epoxy resin, 1-10 parts of epoxy-terminated polysiloxane / polyether copolymer, 1-10 parts of polysiloxane-modified reflective powder, and 0.1-1 parts of fluorescent whitening agent. Component B is an amine curing agent. The tunnel brightening coating of this application exhibits high reflectivity with a low amount of reflective powder added, and also demonstrates good adhesion to the substrate.

Description

Technical Field

[0001] This application relates to the field of tunnel brightening coating technology, and more specifically, to a tunnel brightening coating composition. Background Technology

[0002] When vehicles enter or exit tunnels at high speeds, the "black hole-white hole" effect causes the human eye to undergo light and dark adaptation during changes in ambient light, leading to blurred vision, difficulty seeing objects clearly, and increased risk of accidents. An effective solution is to add a reflective layer at the tunnel entrance or exit. This can be achieved by directly attaching reflective film or applying a brightening coating to surfaces such as stone, concrete, or steel.

[0003] For brightening coatings, reflective powder is usually added to the coating material. The reflective powder is made of high refractive index glass beads (refractive index ND≥1.90, ND≥1.93 or ND≥2.2), and is coated with aluminum on half of the surface as a back reflector. It has extremely strong retroreflective performance and can reflect 85% of the direct light back to the light source to form reflective brightness. Summary of the Invention

[0004] The reflectivity of brightening coatings is primarily provided by reflective powder located on the coating surface. The closer the reflective powder is to the substrate within the coating, the less reflective it produces. Therefore, only the portion of the reflective powder added to the coating surface is actually effective, resulting in low utilization efficiency. To address this issue, this application provides a tunnel brightening coating composition.

[0005] The technical solution adopted in this application is as follows:

[0006] A tunnel brightening coating composition, comprising component A and component B in a weight ratio of 1:0.05-0.4;

[0007] The raw material components of component A, by weight, include: 10-30 parts of epoxy-terminated polysiloxane, 100 parts of epoxy resin, 1-10 parts of epoxy-terminated polysiloxane / polyether copolymer, 1-10 parts of polysiloxane-modified reflective powder, and 0.1-1 parts of fluorescent whitening agent.

[0008] Component B is an amine-based curing agent.

[0009] Preferably, the epoxy-terminated polyorganosiloxane has the general formula R. 1 SiMe2O(SiOMeR 2 ) m SiMe2R 1 , where R 1 R is an organic group containing an epoxy group. 2Selected from C1-C4 alkyl or C6-C12 aromatic groups, Me represents methyl, m = 10-300.

[0010] Preferably, the epoxy resin is selected from one or a combination of several of the following: bisphenol A type epoxy resin and its derivatives, bisphenol F type epoxy resin and its derivatives, polyphenol type glycidyl ether epoxy resin and its derivatives, aliphatic glycidyl ether epoxy resin and its derivatives, and glycidyl ester type epoxy resin and its derivatives.

[0011] Preferably, the general formula of the epoxy-terminated organopolysiloxane / polyether copolymer is R 3 -PE-PDMS-PE-R 3 Or R 4 -PE-PDMS, where R 3 and R 4 Individually, it contains an epoxy group; PE represents polyether, and PDMS represents polydimethylsiloxane.

[0012] Preferably, the polysiloxane used in the polysiloxane-modified reflective powder has the general formula R. 5 SiMe2O(SiOMeR 6 ) x (SiOMeR 7 ) y SiMe2R 5 , where R 5 Selected from C1-C4 alkyl or hydroxyl groups, R 6 Selected from C1-C4 alkyl or C6-C12 aromatic groups, R 7 -(CH2) n Si(OR 8 )3, where R 8 Selected from C1-C4 alkyl or acetyl groups, Me represents methyl, x = 10-100, y = 3-15, n = 2-6.

[0013] Preferably, the polysiloxane used in the polysiloxane-modified reflective powder has the general formula (R... 9 O)3SiO(SiOMeR 10 ) p Si(R 9 O)3, where R 9 Selected from C1-C4 alkyl groups, R 10 Selected from C1-C4 alkyl or C6-C12 aromatic groups, Me represents methyl, p = 10-50.

[0014] Preferably, the raw material components of component A further include: 1-5 parts of mica powder.

[0015] Preferably, the raw material components of component A further include one or more of the following: 0.5-1 parts wetting agent, 0.6-2 parts leveling agent, 0.5-1 parts defoamer, 0.5-2 parts antioxidant, 0.3-1.5 parts thixotropic agent, 0.5-5 parts pigment and 0.5-1 part UV stabilizer.

[0016] Preferably, the preparation method of component A is as follows: the polysiloxane modified reflective powder is added to the epoxy-terminated polyorganosiloxane and dispersed evenly; the epoxy-terminated organopolysiloxane / polyether copolymer is added and stirred evenly; then the epoxy resin is added and stirred evenly to obtain the final product.

[0017] Preferably, the amine curing agent is selected from polyetheramine and its modified forms, polyamide and its modified forms, or phenolic amine and its modified forms.

[0018] The principle of this application is as follows: Two polymer resins with poor compatibility—epoxy resin and polysiloxane—are used as the main resins of the tunnel brightening coating. An epoxy-terminated polysiloxane / polyether copolymer is used as a compatibilizer between the epoxy resin and the polysiloxane, forming a two-phase dispersed and compatible structure similar to an emulsion. Polysiloxane-modified reflective powder is pre-dispersed in the polysiloxane and then blended with the epoxy resin. Due to the poor compatibility between the polysiloxane and epoxy resin in the polysiloxane-modified reflective powder, the polysiloxane-modified reflective powder remains dispersed within the polysiloxane. When a curing agent is added for curing, as the curing reaction gradually occurs, the epoxy resin and polysiloxane undergo phase separation. The polysiloxane containing the polysiloxane-modified reflective powder gradually precipitates onto the coating surface and reacts with the curing agent for curing. Therefore, the tunnel brightening coating of this application, after curing, forms a layered structure with a certain degree of separation. The surface layer is a cross-linked polysiloxane layer with reflective powder dispersed in it, and the lower layer is a cross-linked epoxy resin layer. There is also an intermediate transition structure between the upper and lower layers. Due to the presence of the compatibilizer—epoxy-terminated polysiloxane / polyether copolymer—and the cross-linking and curing effect of the curing agent on the compatibilizer, the entire coating is relatively stable.

[0019] In summary, this application has the following beneficial effects:

[0020] 1. In this application, the reflective powder is basically dispersed in the cross-linked polyorganosiloxane layer of the surface layer. Therefore, a better reflective effect can be achieved with a smaller amount of reflective powder.

[0021] 2. The surface layer of the cross-linked polysiloxane has low surface energy, enabling self-cleaning or easy cleaning, and also exhibits good weather resistance; the underlying cross-linked epoxy resin layer has high adhesion, exhibiting strong adhesion to substrates (such as concrete, stone, or steel). Therefore, the tunnel brightening coating of this application has good stability after curing. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below.

[0023] Throughout this specification, unless otherwise specified, the terminology used herein should be understood as having the meaning commonly used in the art. Therefore, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. In the event of any conflict, this specification shall prevail.

[0024] This application proposes a tunnel brightening coating composition, which is composed of component A and component B in a weight ratio of 1:0.05-0.4; the raw material components of component A, by weight, include: 10-30 parts of epoxy-terminated polysiloxane, 100 parts of epoxy resin, 1-10 parts of epoxy-terminated polysiloxane / polyether copolymer, 1-10 parts of polysiloxane-modified reflective powder and 0.1-1 parts of fluorescent whitening agent;

[0025] Component B is an amine-based curing agent.

[0026] In a preferred embodiment of this application, the general structural formula of the epoxy-terminated polyorganosiloxane is R. 1 SiMe2O(SiOMeR 2 ) m SiMe2R 1 , where R 1 R is an organic group containing an epoxy group. 2 Selected from C1-C4 alkyl or C6-C12 aromatic groups, Me represents methyl, m = 10-300.

[0027] In this application, R 1 It can be -CH2CH2CH2OCH2(CHOCH2) or 1,2-epoxycyclohexylethyl, etc. For example, epoxy-terminated polyorganosiloxanes can be obtained by hydrosilylation reaction of allyl glycidyl ether and dihydrogen-terminated polyorganosiloxane, or by hydrosilylation reaction of 1,2-epoxy-4-vinylcyclohexane and dihydrogen-terminated polyorganosiloxane. Using epoxy-terminated polyorganosiloxanes can achieve poor compatibility with epoxy resins, facilitating the delamination of the two polymer materials during subsequent crosslinking and curing. The surface polyorganosiloxane, after crosslinking and curing, can also achieve a lower surface energy of the coating surface. Furthermore, due to the presence of the terminal epoxy groups, it can achieve crosslinking and curing with the amine curing agent together with the epoxy resin.

[0028] In this application, there are no particular limitations on the epoxy resin. The epoxy value can be 0.35-0.6, and it can be selected from one or a combination of several of bisphenol A type epoxy resins and their derivatives, bisphenol F type epoxy resins and their derivatives, polyphenol type glycidyl ether epoxy resins and their derivatives, aliphatic glycidyl ether epoxy resins and their derivatives, and glycidyl ester type epoxy resins and their derivatives. For example, the epoxy value of epoxy resin E-44 is generally 0.41-0.47, and the epoxy value of epoxy resin E-51 is generally 0.48-0.54.

[0029] In a preferred embodiment of this application, the general formula of the epoxy-terminated organopolysiloxane / polyether copolymer is R. 3 -PE-PDMS-PE-R 3 Or R 4 -PE-PDMS, where R 3 and R 4 Individually, it contains an epoxy-containing organic group; PE represents polyether, and PDMS represents polydimethylsiloxane. In this application, R 3 It can be -CH2CH2CH2OCH2(CHOCH2) or 1,2-epoxycyclohexylethyl, etc. R 3 -PE-PDMS-PE-R 3 It can be obtained by hydrosilylation reaction of terminal allyl epoxy polyether and hydrogen-terminated polysiloxane (H-PDMS-H), a technique well known to those skilled in the art; R 4 -PE-PDMS can be obtained by hydrosilylation reaction of allyl-terminated epoxy polyether and hydrogen-terminated polysiloxane (H-PDMS), a technique well known to those skilled in the art. The general formula for PE can be -(CH2CH2O). a (CH2CHCH3O) b - where a≥0, b≥0, 5≤a+b≤100; the general formula for PDMS can be -SiMe2O(SiOMe2). c SiMe2-, where c = 10-300.

[0030] In this application, the epoxy-terminated organopolysiloxane / polyether copolymer can serve as a compatibilizer between the epoxy-terminated organosiloxane and the epoxy resin. The organopolysiloxane segments in the copolymer exhibit good compatibility with the epoxy-terminated organosiloxane, and the polyether segments in the copolymer exhibit good compatibility with the epoxy resin. Through the compatibility of the epoxy-terminated organopolysiloxane / polyether copolymer, the epoxy-terminated organosiloxane and epoxy resin in component A can form a two-phase dispersion structure similar to an emulsion. However, when component A undergoes crosslinking and curing, as the epoxy resin and epoxy-terminated organopolysiloxane / polyether copolymer gradually crosslink and cure, the compatibility of the compatibilizer gradually fails. The epoxy-terminated organosiloxane gradually separates from the epoxy resin and precipitates onto the surface of the coating. However, some crosslinked organosiloxane and crosslinked epoxy resin remain incompletely separated, forming a transitional structure of an interpenetrating polymer network. Therefore, the coating structure formed after the tunnel brightening coating composition of this application is cured is as follows: the surface layer is a cross-linked polyorganosiloxane, the bottom layer is a cross-linked epoxy resin, and the middle layer is a transitional structure in which cross-linked polyorganosiloxane and cross-linked epoxy resin interpenetrate.

[0031] In a preferred embodiment of this application, the polysiloxane used in the polysiloxane-modified reflective powder has the general formula R. 5 SiMe2O(SiOMeR 6 ) x (SiOMeR 7 ) y SiMe2R 5 , where R 5 Selected from C1-C4 alkyl or hydroxyl groups, R 6 Selected from C1-C4 alkyl or C6-C12 aromatic groups, R 7 -(CH2) n Si(OR 8 )3, where R 8 Selected from C1-C4 alkyl or acetyl groups, where Me represents methyl, x = 10-100, y = 3-15, n = 2-6. The R group of the polysiloxane molecule's side chain... 7 After the alkoxysilane group in the polysiloxane undergoes hydrolysis, it can condense with the hydroxyl groups on the surface of the reflector, thereby grafting the polysiloxane onto the surface of the reflector. For example, the aforementioned polysiloxane can be derived from the corresponding hydrogen-containing polysiloxane R... 5 SiMe2O(SiOMeR 6 ) x (SiOMeH) y SiMe2R 5 With CH2=CH(CH2) n- 2Si(OR 8 )3 is obtained by hydrosilylation reaction.

[0032] In a preferred embodiment of this application, the polysiloxane used in the polysiloxane-modified reflective powder has the general formula (R... 9 O)3SiO(SiOMeR 10 ) p Si(R 9 O)3, where R 9 Selected from C1-C4 alkyl groups, R 10 Selected from C1-C4 alkyl or C6-C12 aromatic groups, Me represents methyl, p = 10-50. After hydrolysis of the alkoxysilane end group of the polysiloxane, it can undergo a condensation reaction with the hydroxyl groups on the reflector surface, thereby grafting the polysiloxane onto the reflector surface. For example, the above-mentioned polysiloxane can be derived from the corresponding silanol HO(SiOMeR). 10 ) p OH and alkyl orthosilicate (R 9 It is obtained by condensation and de-alcoholization reaction of O)4Si.

[0033] The tunnel brightening coating A component of this application incorporates a fluorescent whitening agent, which converts absorbed ultraviolet radiation into violet-blue fluorescent radiation, complementing the original yellow light radiation to form white light, which is then reflected, thus improving brightness. In this application, the fluorescent whitening agent is not particularly limited and can be fluorescent whitening agents such as OB, OB-1, PF, ER-1, KCB, KSN, etc.

[0034] In a preferred embodiment of this application, the raw material components of component A further include 1-5 parts of mica powder. Mica powder has a flaky crystalline structure with a smooth and flat surface, and contains a large amount of metals such as aluminum and iron and their oxides, giving it good light-reflecting properties. Adding mica powder to the tunnel brightening coating allows light not reflected by the reflective powder in the brightening coating to continue being reflected when it encounters the mica powder, thereby improving the reflectivity of the brightening coating. In this application, the mica powder can be dispersed together with the polysiloxane-modified reflective powder in an epoxy-terminated polyorganosiloxane.

[0035] In a preferred embodiment of this application, the raw material components of component A further include one or a combination of the following: 0.5-1 parts wetting agent, 0.6-2 parts leveling agent, 0.5-1 parts defoamer, 0.5-2 parts antioxidant, 0.3-1.5 parts thixotropic agent, 0.5-5 parts pigment and 0.5-1 part UV stabilizer.

[0036] In this application, the wetting agent can be a polyether-modified silicone oil wetting agent, which can be directly obtained from commercially available products; the leveling agent can be a polyether-modified silicone oil leveling agent or an acrylic leveling agent, which can be directly obtained from commercially available products; the defoamer can be dimethyl silicone oil, which can be directly obtained from commercially available products; the antioxidant can be antioxidant 1010, antioxidant 168, etc., which can be directly obtained from commercially available products; the thixotropic agent can be fumed silica, organobentonite, attapulgite, hydrogenated castor oil, etc., which can be directly obtained from commercially available products; and the UV stabilizer can be UV stabilizers UV531, UV329, UV326, etc., which can be directly obtained from commercially available products.

[0037] In a preferred embodiment of this application, the preparation method of component A can be as follows: first, the polysiloxane-modified reflective powder is dispersed in an epoxy-terminated polysiloxane, and then mixed evenly with the epoxy-terminated polysiloxane / polyether copolymer and epoxy resin. Specifically, the polysiloxane-modified reflective powder is added to the epoxy-terminated polysiloxane and dispersed evenly (ultrasonic dispersion, high-speed stirring dispersion, or three-roll mill mixing, etc.), the epoxy-terminated polysiloxane / polyether copolymer is added and stirred evenly, and then the epoxy resin is added and stirred evenly (stirring can be high-speed stirring, such as 1500-3000 rpm), thus obtaining the final product.

[0038] In a preferred embodiment of this application, the amine curing agent is selected from polyetheramines and their modified forms, polyamides and their modified forms, or phenolic amines and their modified forms. The polyetheramine curing agent can be D230, D400, D2000, etc., or a Michael addition product of polyetheramine and allyl acrylate; the polyetheramine curing agent can be 650 curing agent, 651 curing agent, etc.; the phenolic amine curing agent can be TZ-46, TZ-50, T31, etc.

[0039] In this application, a certain amount of curing accelerator, such as an organic tertiary amine, may also be added to component B. The amount of accelerator can be 1-5% of the amount of amine curing agent.

[0040] The technical solution of this application will be described in detail below with reference to preparation examples, embodiments, and comparative examples. Unless otherwise specified, the parts in each preparation example, embodiment, and comparative example below are parts by weight.

[0041] Preparation Examples 1-3: Preparation of Polysiloxane Modified Reflective Powder

[0042] Preparation Example 1

[0043] Polysiloxane SiMe3O (SiOMe2) 80.4 (SiOMeR 7 ) 7.3 SiMe3,R 7The form is -(CH2)2Si(OMe)3. Polysiloxanes can be made from the corresponding hydrogen-containing silicone oil SiMe3O(SiOMe2). 80.4 (SiOMeH) 7.3 SiMe3 and vinyltrimethoxysilane were mixed in a molar ratio of 1:10 and reacted at 130–135 °C for 3 hours under the catalysis of Karstedt catalyst (15 ppm based on Pt). Excess vinyltrimethoxysilane was removed by vacuum distillation to obtain the final product.

[0044] At room temperature, 1 part of polysiloxane was added to 50 parts of anhydrous ethanol and stirred evenly. 3 parts of acidic water with pH 3 were added dropwise and stirred for 0.5 hours. 4 parts of reflective powder 3M-4 (400 mesh particle size) were added and stirred for 1 hour. The temperature was raised to 60°C and stirred for another 2 hours. The mixture was filtered, and the solid was washed twice with anhydrous ethanol. The mixture was then dried overnight in a 60°C oven to obtain the modified reflective powder.

[0045] Preparation Example 2

[0046] Polysiloxane SiMe3O (SiOMe2) 45.8 (SiOMeR 7 ) 6.7 SiMe3,R 7 It is -(CH2)2Si(OCH2CH3)3.

[0047] At room temperature, 1 part of polysiloxane was added to 50 parts of anhydrous ethanol and stirred evenly. 3 parts of acidic water with pH 2.5 were added dropwise and stirred for 0.5 hours. 3 parts of reflective powder 3M-5 (500 mesh particle size) were added and stirred for 1 hour. The temperature was raised to 60°C and stirred for another 2 hours. The mixture was filtered, and the solid was washed twice with anhydrous ethanol. The mixture was then dried overnight in a 60°C oven to obtain the modified reflective powder.

[0048] Preparation Example 3

[0049] At room temperature, 1 part of polysiloxane (MeO)3SiO (SiOMe2) 33.7 Si(MeO)3 was added to 50 parts of anhydrous ethanol and stirred evenly. 4 parts of acidic water with pH 3 were added dropwise and stirred for 1 hour. 3 parts of reflective powder 3M-5 (500 mesh particle size) were added and stirred for 1 hour. The temperature was raised to 60℃ and stirred for another 2 hours. The mixture was filtered, and the filtered solid was washed twice with anhydrous ethanol. The mixture was then dried overnight in a 60℃ oven to obtain the modified reflective powder.

[0050] Example 1

[0051] Epoxy-terminated polyorganosiloxane R 1 SiMe2O(SiOMe2) 41.6 SiMe2R 1 , where R 1It is -CH2CH2CH2OCH2(CHOCH2). Epoxy-terminated polyorganosiloxanes can be made from allyl glycidyl ether and dihydrogen-terminated polydimethylsiloxane HSiMe2O(SiOMe2). 41.6 SiMe2H was obtained by hydrosilylation reaction at 130–135 °C for 3 hours at a molar ratio of 2:1 (using Karstedt catalyst, 15 ppm based on Pt).

[0052] Compatibilizer: Epoxy-terminated organopolysiloxane / polyether copolymer R 3 OPE(CH2)3SiMe2O(SiOMe2) 22.3 SiOMe2(CH2)3PEOR 3 , where R 3 The form is -CH2CH2CH2OCH2(CHOCH2), and PE is -(CH2CH2O). 6.3 (CH2CHCH3O) 10.2 - The compatibilizer can be obtained by hydrosilylation reaction of the corresponding allyl-terminated epoxy polyether and dihydrogen-terminated polydimethylsiloxane at a molar ratio of 2:1 at 130-135°C for 4 hours (Karstedt catalyst, 20 ppm based on Pt).

[0053] The A component of the tunnel brightening coating composition consists of: 20 parts of epoxy-terminated polyorganosiloxane, 100 parts of bisphenol F type epoxy resin, 5 parts of compatibilizer, 5 parts of the modified reflective powder of Preparation Example 1, and 0.3 parts of fluorescent whitening agent PF.

[0054] The modified reflective powder was added to the epoxy-terminated polyorganosiloxane and stirred at 600 rpm for 5 min. The stirring speed was increased to 3000 rpm and stirred for 10 min. The stirring speed was reduced to 300 rpm, the fluorescent whitening agent PF and compatibilizer were added, and stirring was continued for 10 min. Bisphenol F type epoxy resin was added and stirring was continued for 15 min to obtain component A.

[0055] Example 2

[0056] The difference between Example 2 and Example 1 is that in Example 1, the epoxy-terminated polyorganosiloxane was adjusted from 20 parts to 10 parts, while the other steps remained unchanged.

[0057] Example 3

[0058] The difference between Example 3 and Example 1 is that in Example 1, the epoxy-terminated polyorganosiloxane was adjusted from 20 parts to 30 parts, while the other steps remained unchanged.

[0059] Comparative Example 1

[0060] The preparation method is as follows, based on component A of the tunnel brightening coating composition in Example 1:

[0061] Epoxy-terminated polyorganosiloxane, fluorescent whitening agent PF, compatibilizer and epoxy resin are mixed and stirred at 600 rpm for 10 min. Modified reflective powder is added and stirred at 600 rpm for 5 min. The stirring speed is increased to 3000 rpm and stirred for 10 min to obtain component A.

[0062] Comparative Example 2

[0063] The A component of the tunnel brightening coating composition consists of: 120 parts of bisphenol F type epoxy resin of Example 1, 5 parts of modified reflective powder of Preparation Example 1, and 0.3 parts of fluorescent whitening agent PF.

[0064] Fluorescent brightener PF and modified reflective powder were added to bisphenol F type epoxy resin and stirred at 600 rpm for 5 min. The stirring speed was then increased to 3000 rpm and stirred for 10 min to obtain component A.

[0065] Comparative Example 3

[0066] The A component of the tunnel brightening coating composition consists of: 120 parts of bisphenol F type epoxy resin from Example 1, 5 parts of compatibilizer from Example 1, 5 parts of modified reflective powder from Preparation Example 1, and 0.3 parts of fluorescent whitening agent PF.

[0067] The fluorescent whitening agent PF, compatibilizer and epoxy resin were mixed and stirred at 600 rpm for 10 min. Modified reflective powder was added and stirred at 600 rpm for 5 min. The stirring speed was increased to 3000 rpm and stirred for 10 min to obtain component A.

[0068] Comparative Example 4

[0069] The difference between Comparative Example 4 and Comparative Example 3 is that in Comparative Example 3, the bisphenol F type epoxy resin was replaced with an equal weight of the epoxy-terminated polysiloxane in Example 1, while the other steps remained unchanged.

[0070] Comparative Example 5

[0071] The difference between Comparative Example 5 and Example 1 is that in Example 1, the modified reflective powder was replaced with an equal weight of reflective powder 3M-4, while the other steps remained unchanged.

[0072] Example 4

[0073] Epoxy-terminated polyorganosiloxane R 1 SiMe2O(SiOMe2) 65.2 SiMe2R 1 , where R 1It is -CH2CH2CH2OCH2(CHOCH2). Epoxy-terminated polyorganosiloxanes can be made from allyl glycidyl ether and dihydrogen-terminated polydimethylsiloxane HSiMe2O(SiOMe2). 65.2 SiMe2H was obtained by hydrosilylation reaction at a molar ratio of 2:1 at 130–135 °C for 3.5 hours (using Karstedt catalyst, 15 ppm based on Pt).

[0074] Compatibilizer: Epoxy-terminated organopolysiloxane / polyether copolymer R 3 OPE(CH2)3SiMe2O(SiOMe2) 30.7 SiOMe2(CH2)3PEOR 3 , where R 3 The form is -CH2CH2CH2OCH2(CHOCH2), and PE is -(CH2CH2O). 7.1 (CH2CHCH3O) 18.3 - The compatibilizer can be obtained by hydrosilylation reaction of the corresponding allyl-terminated epoxy polyether and dihydrogen-terminated polydimethylsiloxane at a molar ratio of 2:1 at 130-135°C for 4 hours (Karstedt catalyst, 20 ppm based on Pt).

[0075] The A component of the tunnel brightening coating composition consists of: 25 parts epoxy-terminated polyorganosiloxane, 100 parts bisphenol A type epoxy resin, 7 parts compatibilizer, 3 parts modified reflective powder from Preparation Example 2, 0.8 parts polyether-modified silicone oil leveling agent, and 1 part...

[0076] Dimethyl silicone oil defoamer, 1 part antioxidant 1010, 0.8 parts organobentonite and 0.2 parts fluorescent whitening agent KSN.

[0077] Modified reflective powder was added to epoxy-terminated polyorganosiloxane and stirred at 600 rpm for 5 minutes. The stirring speed was increased to 3000 rpm and stirred for 10 minutes. The stirring speed was reduced to 300 rpm, fluorescent whitening agent KSN and compatibilizer were added, and stirring was continued for 10 minutes. Bisphenol F epoxy resin, leveling agent and defoamer were added, and stirring was continued for 15 minutes. Finally, organobentonite was added and stirred at 1500 rpm for 5 minutes to obtain component A.

[0078] Example 5

[0079] The difference between Example 5 and Example 4 is that in Example 4, the modified reflective powder was changed from 3 parts to 6 parts, while the other steps remained unchanged.

[0080] Example 6

[0081] The difference between Example 6 and Example 4 is that in Example 4, the modified reflective powder was changed from 3 parts to 10 parts, while the other steps remained unchanged.

[0082] Example 7

[0083] The difference between Example 7 and Example 4 is that in Example 4, 3 parts of the modified reflective powder of Preparation Example 2 were replaced with 6 parts of the modified reflective powder of Preparation Example 3, while the other steps remained unchanged.

[0084] Example 8

[0085] The difference between Example 8 and Example 5 is that in Example 5, 2 parts of 800-mesh mica powder were added to component A and added together with the modified reflective powder to the epoxy-terminated polysiloxane, while the other steps remained unchanged.

[0086] Example 9

[0087] The difference between Example 9 and Example 8 is that in Example 8, the amount of mica powder was changed from 2 parts to 4 parts, while the other steps remained unchanged.

[0088] The components A of Examples 1-9 and Comparative Examples 1-5 and the curing agent polyetheramine D230 were mixed at a weight ratio of 1:0.15, coated on a clean tinplate surface to a thickness of 100 μm, and cured at room temperature for 48 hours to obtain a brightening coating.

[0089] Brightening coating performance test

[0090] Reflectivity: The retroreflection coefficient was measured using a retroreflection tester under white light.

[0091] Adhesive shear strength: Tested in accordance with GB / T 7124-2008.

[0092] Water contact angle: Tested using a water droplet angle tester.

[0093] The results are shown in Table 1 below.

[0094] Table 1

[0095] <![CDATA[Retroreflection coefficient / mcd / (m 2 ·lx)]]> Bond strength / MPa Water contact angle / ° Example 1 213 13.9 108 Example 2 228 14.3 102 Example 3 204 13.5 111 Comparative Example 1 174 12.3 106 Comparative Example 2 126 14.6 81 Comparative Example 3 131 14.0 87 Comparative Example 4 135 10.4 105 Comparative Example 5 192 12.7 104 Example 4 191 13.7 112 Example 5 210 13.5 108 Example 6 223 13.2 106 Example 7 208 13.4 105 Example 8 219 13.5 105 Example 9 225 13.1 102

[0096] As shown in Table 1 above, the tunnel brightening coating of this application has good reflective properties, high bonding strength, and good hydrophobicity. Taking Example 1 and Comparative Examples 2-4 as examples, in Example 1, the reflective powder is concentrated on the surface layer of the coating. Although the weight percentage of the reflective powder in the coating is not high, its weight percentage on the surface layer is relatively high. Therefore, a high reflective effect can be obtained with a low amount of reflective powder. In addition, the epoxy resin, as the bottom layer of the coating, adheres to the substrate, giving full play to the high bonding strength characteristic of epoxy resin.

[0097] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A tunnel brightening coating composition characterized in that, consisting of the A component and the B component in a weight ratio of 1:0.05-0.4; the raw material components of the A component include, by weight fraction, 10-30 parts of epoxy-terminated polyorganosiloxane, 100 parts of epoxy resin, 1-10 parts of epoxy-terminated organopolysiloxane / polyether copolymer, 1-10 parts of polysiloxane-modified reflective powder and 0.1-1 part of fluorescent whitening agent; The general formula of the epoxy-terminated polyorganosiloxane is R 1 SiMe2O(SiOMeR 2 ) m SiMe2R 1 wherein R 1 is an epoxy-containing organic group, R 2 is selected from C1-C4 alkyl or C6-C12 aromatic group, Me represents methyl, and m = 10-300; The general formula of the epoxy-terminated organopolysiloxane / polyether copolymer is R 3 -PE-PDMS-PE-R 3 or R 4 -PE-PDMS, wherein R 3 and R 4 are independently epoxy-containing organic groups, PE represents a polyether, and PDMS represents a polydimethylsiloxane; The polysiloxane used in the polysiloxane modified reflective powder has a general formula of R 5 SiMe2O(SiOMeR 6 ) x (SiOMeR 7 ) y SiMe2R 5 , wherein R 5 is selected from C1-C4 alkyl or hydroxyl, R 6 is selected from C1-C4 alkyl or C6-C12 aromatic group, R 7 is -(CH2) n , and Si(OR 8 )3, wherein R 8 is selected from C1-C4 alkyl or acetyl, Me represents methyl, x = 10-100, y = 3-15, and n = 2-6; or, the polysiloxane used in the polysiloxane modified reflective powder has a general formula of (R 9 O)3SiO(SiOMeR 10 ) p Si(R 9 O)3, wherein R 9 is selected from C1-C4 alkyl, R 10 is selected from C1-C4 alkyl or C6-C12 aromatic group, and Me represents methyl, p = 10-50. the preparation method of the A component is as follows: the polysiloxane-modified reflective powder is added into the epoxy-terminated polyorganosiloxane, uniformly dispersed, the fluorescent whitening agent and the epoxy-terminated organopolysiloxane / polyether copolymer are added, uniformly stirred, then the epoxy resin is added, uniformly stirred, and the A component is obtained; the B component is an amine-based curing agent.

2. The tunneling brightcoat composition according to claim 1, characterized in that, the epoxy resin is selected from one or a combination of bisphenol A type epoxy resin and its derivatives, bisphenol F type epoxy resin and its derivatives, polyphenol type glycidyl ether epoxy resin and its derivatives, aliphatic glycidyl ether epoxy resin and its derivatives, and glycidyl ester type epoxy resin and its derivatives.

3. The tunneling brightener coating composition of claim 1, wherein, the raw material components of the A component further include 1-5 parts of mica powder.

4. The tunneling brightener coating composition of claim 1, wherein, the raw material components of the A component further include one or a combination of 0.5-1 part of wetting agent, 0.6-2 parts of leveling agent, 0.5-1 part of defoaming agent, 0.5-2 parts of antioxidant, 0.3-1.5 parts of thixotropic agent, 0.5-5 parts of pigment and 0.5-1 part of ultraviolet resistant agent.

5. The tunneling brightener coating composition of claim 1, wherein, the amine-based curing agent is selected from polyether amine and its modified product, polyamide and its modified product, or phenolic amine and its modified product.