Two-component polyurethane sealant for coated glass

Abstract

The invention belongs to the field of bonding materials, and relates to a two-component polyurethane sealant for coated glass, which comprises a component A and a component B, the component A comprises hydroxyl-terminated polybutadiene and modified castor oil polyol; and the component B comprises an isocyanate monomer. The sealant has excellent tensile adhesion performance and definite elongation adhesion performance, and excellent weather resistance and aging resistance.

Description

Technical Field

[0001] The invention belongs to the field of adhesive materials and relates to a two-component polyurethane sealant for coated glass. Background Art

[0002] As a specially treated glass material, coated glass plays an important role in insulating glass. It can not only adjust the transmittance of light and improve indoor comfort, but also has functions such as heat insulation, thermal insulation and UV protection. With the in-depth implementation of environmental protection and energy-saving policies, the market demand for high-performance building materials is growing. Coated glass, especially Low-E coated glass (low-radiation glass), is gradually penetrating from the high-end large public building market to the civil housing field due to its excellent thermal insulation performance and effective UV blocking.

[0003] Coated glass is usually coated with one or more layers of stainless steel, chromium and other metals and compounds on the glass surface, thus forming a thin film on the glass surface, which ultimately significantly improves the glass transmittance, reflectivity and absorptivity. Therefore, heat-reflective glass is also called sunlight control glass. This type of glass is mainly used in glass curtain walls and construction. At the same time, the demand for coated glass in many fields such as automobiles, ships, and electronics is also increasing to improve thermal insulation performance and reduce energy consumption.

[0004] At present, in the actual coating glass bonding process, in order to prevent the sealant from forming a chemical reaction with the coating layer and causing the seal to fail; to prevent the coating layer from being oxidized after being exposed to the air and the oxidation area from spreading to the center of the glass; and to prevent the adhesive force of the glue on the coating layer from decreasing. At present, in the coating glass bonding process, a film removal wheel is generally used for film removal, which prolongs the time and working hours, affects the production efficiency of the enterprise, and increases the production cost. Therefore, the market is in urgent need of a two-component polyurethane sealant that can bond well to coated glass without the film removal process.

[0005] CN108795363A provides a two-component polyurethane sealant for hollow glass and a preparation method thereof, wherein the sealant comprises component A and component B. The sealant has good water tightness and air tightness and good adhesion to the substrate.

[0006] CN105950102A discloses a high elastic recovery rate silicone sealant for insulating glass and a preparation method thereof, which is mainly used for the secondary sealing of insulating glass. The silicone sealant is characterized in that the silicone sealant contains two components A and B. In addition to having good strength, elasticity and adhesion, and excellent aging resistance, the silicone sealant of the present invention has an elastic recovery rate of up to 96%, which can greatly improve the service life of the insulating glass sealant. Summary of the invention

[0007] In order to solve the above technical problems, the present application provides a two-component polyurethane sealant for coated glass, which has excellent tensile bonding properties and fixed-stretch bonding properties, as well as excellent weather resistance and anti-aging properties.

[0008] In order to achieve the above effects, the present invention adopts the following technical solutions:

[0009] The invention provides a two-component polyurethane sealant for coated glass. The sealant comprises an A component and a B component.

[0010] The A component includes hydroxyl-terminated polybutadiene and modified castor oil polyol.

[0011] The B component includes an isocyanate monomer.

[0012] As a preferred technical solution of the present invention, component A includes 15 to 35 parts of hydroxyl-terminated polybutadiene and 15 to 35 parts of modified castor oil polyol, based on parts by weight.

[0013] As a preferred technical solution of the present invention, the weight average molecular weight of the hydroxyl-terminated polybutadiene is 2000-4000 g / mol, and the hydroxyl value is 30-68 mgKOH / g.

[0014] As a preferred technical solution of the present invention, the weight average molecular weight of the modified castor oil polyol is 500-2500 g / mol.

[0015] As the preferred technical solution of this invention, component A further comprises, by weight:

[0016] 0-0.5 parts of chain extender, 15-25 parts of plasticizer, 0-1.5 parts of light stabilizer, 0-1.5 parts of antioxidant, 1.0-3.0 parts of silane coupling agent composition, 40-50 parts of filler, 1-5 parts of fumed silica and 0.1-0.5 parts of catalyst.

[0017] As a preferred technical solution of the present invention, the silane coupling agent composition includes a combination of at least two of N-phenyl-3-aminopropyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, γ-glycidoxypropylmethyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-mercaptopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane or thiosilicate, O,O,O-triethyl-sulfur-[3-(triethoxysilyl)propyl] ester.

[0018] As a preferred technical solution of this invention, component B includes 55 to 80 parts of isocyanate monomer.

[0019] As the preferred technical solution of the present invention, the isocyanate monomer includes any one of diphenylmethane diisocyanate MDI-100, diphenylmethane diisocyanate MDI-50, carbodiimide-uretonimine modified 4,4'-diphenylmethane diisocyanate MDI-100L, polymeric isocyanate WANNATE® PM-200 or modified isocyanate WANNATE® PM8236, or a combination of at least two thereof.

[0020] As the preferred technical solution of this invention, component B further includes, by weight: 0 to 20 parts of isocyanate polymer, 0.5 to 3 parts of water scavenger, 8 to 15 parts of plasticizer, and 5 to 10 parts of carbon black.

[0021] As a preferred technical solution of the present invention, the isocyanate polymer is a terminal isocyanate polymer obtained by reacting a diisocyanate monomer with a hydroxyl-terminated polybutadiene and a modified castor oil polyol;

[0022] The isocyanate content in the isocyanate polymer is 15-20%.

[0023] Compared with the prior art, the present invention has at least the following beneficial effects:

[0024] (1) The present invention provides a two-component polyurethane sealant for coated glass, which has excellent tensile bonding properties and fixed-stretch bonding properties;

[0025] (2) The present invention provides a two-component polyurethane sealant for coated glass, which has excellent water-UV anti-aging performance, hot air environment anti-aging performance, humid heat environment anti-aging performance, water immersion anti-aging performance, and salt spray environment anti-aging performance. DETAILED DESCRIPTION

[0026] The technical solution of the present application is further described below through specific implementation methods.

[0027] A specific embodiment of the present invention provides a two-component polyurethane sealant for coated glass, wherein the sealant comprises an A component and a B component.

[0028] The A component includes hydroxyl-terminated polybutadiene and modified castor oil polyol.

[0029] The B component includes an isocyanate monomer.

[0030] In the present invention, the polyurethane sealant is divided into component A and component B to facilitate the storage and preparation of the sealant. Hydroxyl terminated polybutadiene and modified castor oil polyol are used in the sealant to improve the tensile bonding strength, fixed elongation bonding performance and anti-aging performance of the sealant. The main reason is that the hydroxyl terminated polybutadiene and the modified castor oil polyol can form a directional and uniform interpenetrating structure when they react and cure with isocyanate, and the non-polar structure of the hydroxyl terminated polybutadiene and the deesterified, hydrogenated, low-hydroxyl modified castor oil provide excellent tensile bonding strength, fixed elongation bonding performance and anti-aging performance.

[0031] In a specific embodiment of the present invention, component A includes 15 to 35 parts of hydroxyl-terminated polybutadiene and 15 to 35 parts of modified castor oil polyol in parts by weight. The weight of hydroxyl-terminated polybutadiene can be 15, 16, 18, 20, 22, 25, 28, 30, 32 or 35 parts, and the weight of modified castor oil polyol can be 15, 16, 18, 20, 22, 25, 28, 30, 32 or 35 parts, but are not limited to the listed values, and other values ​​not listed within the above numerical ranges are also applicable.

[0032] In a specific embodiment of the present invention, the weight average molecular weight of the hydroxyl-terminated polybutadiene is 2000-4000 g / mol, and the hydroxyl value is 30-68 mgKOH / g. Wherein, the weight average molecular weight of the hydroxyl-terminated polybutadiene can be 2000 g / mol, 2200 g / mol, 2500 g / mol, 2800 g / mol, 3000 g / mol, 3200 g / mol, 3500 g / mol, 3800 g / mol or 4000 g / mol, etc., and the hydroxyl value can be 30 mgKOH / g, 35 mgKOH / g, 40 mgKOH / g, 45 mgKOH / g, 50 mgKOH / g, 55 mgKOH / g, 60 mgKOH / g, 65 mgKOH / g or 68 mgKOH / g, etc., but are not limited to the listed values, and other unlisted values ​​within the above-mentioned numerical ranges are equally applicable.

[0033] In a specific embodiment of the present invention, the hydroxyl-terminated polybutadiene can be any one of Evonik Degussa Poly bdR-45M, Poly bdR-45HTLO, polyvestHT, Tianyuan Aerospace Materials HTPB-I or HTPB-IV, or a combination of at least two thereof.

[0034] In a specific embodiment of the present invention, the weight average molecular weight of the modified castor oil polyol is 500-2500 g / mol, such as 500 g / mol, 1000 g / mol, 1500 g / mol, 2000 g / mol or 2500 g / mol, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0035] In a specific embodiment of the present invention, the modified castor oil polyol can be any one of Ito URICH-1830, URICH-1824, AC-006, AC-009, H368, Vantellus M-365 or M-280, or a combination of at least two thereof.

[0036] In one specific embodiment of the present invention, component A further comprises, by weight:

[0037] 0-0.5 parts of chain extender, 15-25 parts of plasticizer, 0-1.5 parts of light stabilizer, 0-1.5 parts of antioxidant, 1.0-3.0 parts of silane coupling agent composition, 40-50 parts of filler, 1-5 parts of fumed silica and 0.1-0.5 parts of catalyst.

[0038] Among them, the weight part of the chain extender can be 0 parts, 0.1 parts, 0.2 parts, 0.3 parts, 0.4 parts or 0.5 parts, etc., the weight part of the plasticizer can be 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts or 25 parts, etc., the weight part of the light stabilizer can be 0 parts, 0.1 parts, 0.2 parts, 0.5 parts, 0.8 parts, 1.2 parts or 1.5 parts, etc., the weight part of the antioxidant can be 0 parts, 0.1 parts, 0.2 parts, 0.5 parts, 0.8 parts, 1.2 parts or 1.5 parts, etc., the weight part of the silane coupling agent composition can be 1.0 parts, 1.2 parts, 1 .5 parts, 1.8 parts, 2.0 parts, 2.2 parts, 2.5 parts, 2.8 parts or 3.0 parts, etc., the weight parts of filler can be 40 parts, 41 parts, 42 parts, 43 parts, 44 parts, 45 parts, 46 parts, 47 parts, 48 ​​parts, 49 parts or 50 parts, etc., the weight parts of fumed silica can be 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts or 5 parts, etc., the weight parts of catalyst can be 0.1 parts, 0.2 parts, 0.5 parts, 0.8 parts, 1.2 parts or 1.5 parts, etc., but are not limited to the listed values, and other values ​​not listed within the above numerical ranges are equally applicable.

[0039] In a specific embodiment of the present invention, the silane coupling agent composition includes a combination of at least two of N-phenyl-3-aminopropyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, γ-glycidoxypropylmethyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-mercaptopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane or thiosilicate, O,O,O-triethyl-sulfo-[3-(triethoxysilyl)propyl] ester. Among them, typical but non-limiting examples of the combination include a combination of N-phenyl-3-aminopropyltrimethoxysilane and 3-methacryloxypropyltrimethoxysilane, a combination of 3-methacryloxypropyltrimethoxysilane and γ-glycidyloxypropylmethyltrimethoxysilane, a combination of γ-glycidyloxypropylmethyltrimethoxysilane and γ-mercaptopropyltrimethoxysilane, a combination of γ-mercaptopropyltrimethoxysilane and γ-mercaptopropyltriethoxysilane, a combination of γ-mercaptopropyltriethoxysilane and γ-aminopropyltrimethoxysilane, a combination of γ-aminopropyltrimethoxysilane and γ-aminopropyltriethoxysilane, a combination of γ-aminopropyltriethoxysilane and thiosilicic acid, O,O,O-triethyl-thio-[3-(triethoxysilyl)propyl] ester, and the like.

[0040] In a specific embodiment of the present invention, in the silane coupling agent composition, when the silane coupling agent composition includes two silane coupling agents, namely a first silane coupling agent and a second silane coupling agent, the weight ratio of the first silane coupling agent to the second silane coupling agent can be 0 to 2, excluding 0, and is preferably 1.

[0041] In a specific embodiment of the present invention, the chain extender can be any one of ethylene glycol, butanediol, dipropylene glycol, 1,4-butanediol, 1,6-hexanediol or 2-ethyl-1,3-hexanediol, or a combination of at least two thereof.

[0042] In a specific embodiment of the present invention, the plasticizer can be any one of dipropylene glycol dibenzoate, alkyl phenyl sulfonate, diisononyl phthalate, diisooctyl phthalate or diisodecyl phthalate, or a combination of at least two thereof.

[0043] In a specific embodiment of the present invention, the light stabilizer can be any one of BASF's TINUVIN 292, TINUVIN 770DF, TINUVIN 326, TINUVIN P or TINUVIN 622, or a combination of at least two thereof.

[0044] In a specific embodiment of the present invention, the antioxidant can be any one of antioxidant TP-10H, antioxidant 1076, antioxidant 245, antioxidant Irgafos168 or antioxidant 1010, or a combination of at least two thereof.

[0045] In a specific embodiment of the present invention, the filler can be any one of clay, nano calcium carbonate, light calcium carbonate or talcum powder, or a combination of at least two of them.

[0046] In one specific embodiment of the present invention, the fumed silica is preferably hydrophobic fumed silica.

[0047] In a specific embodiment of the present invention, the catalyst can be any one or a combination of at least two of a zinc-bismuth composite catalyst, an organotin catalyst, an organobismuth catalyst, an organozinc catalyst, an organozirconium catalyst, or a Polycat SA series of thermosensitive catalysts. More preferably, it can be any one or a combination of at least two of dibutyltin dichloride, dibutyltin dilaurate, stannous octoate, or dibutyltin diacetate.

[0048] In one specific embodiment of the present invention, the preparation method of component A may include the following steps:

[0049] Mixing hydroxyl-terminated polybutadiene, modified castor oil polyol, chain extender and plasticizer in reverse order to obtain a first mixture;

[0050] Add filler to the first mixture, and perform vacuum heating dehydration treatment under stirring until the water content is ≤300 ppm to obtain a second mixture;

[0051] The second mixture is cooled, and a light stabilizer, an antioxidant, a silane coupling agent composition, fumed silica and a catalyst are added, mixed evenly under vacuum conditions, and then sealed for storage.

[0052] In a specific embodiment of the present invention, the conditions of stirring, vacuum heating dehydration treatment and cooling in the preparation method of component A can be adjusted according to the specific substances selected for each raw material and the weight parts added, and are not further limited here.

[0053] In a specific embodiment of the present invention, component B includes 55 to 80 parts of isocyanate monomer, such as 55 parts, 60 parts, 65 parts, 70 parts, 75 parts or 80 parts, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0054] In a specific embodiment of the present invention, the isocyanate monomer includes any one of diphenylmethane diisocyanate MDI-100, diphenylmethane diisocyanate MDI-50, carbodiimide-uretonimine modified 4,4'-diphenylmethane diisocyanate MDI-100L, polymeric isocyanate WANNATE® PM-200 or modified isocyanate WANNATE® PM8236, or a combination of at least two thereof.

[0055] In a specific embodiment of the present invention, component B further comprises, by weight: 0 to 20 parts of isocyanate polymer, 0.5 to 3 parts of water scavenger, 8 to 15 parts of plasticizer, and 5 to 10 parts of carbon black.

[0056] Among them, the weight part of isocyanate polymer can be 0 part, 2 parts, 5 parts, 8 parts, 10 parts, 12 parts, 15 parts, 18 parts or 20 parts, etc., the weight part of water remover can be 0.5 parts, 1.0 parts, 1.5 parts, 2.0 parts, 2.5 parts or 3 parts, etc., the weight part of plasticizer can be 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts or 15 parts, etc., the weight part of carbon black can be 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts, etc., but are not limited to the listed values, and other unlisted values ​​within the above numerical ranges are equally applicable.

[0057] In one specific embodiment of the present invention, the isocyanate polymer is an isocyanate-terminated polymer obtained by reacting a diisocyanate monomer with a hydroxyl-terminated polybutadiene and a modified castor oil polyol.

[0058] In a specific embodiment of the present invention, the mass ratio of hydroxyl-terminated polybutadiene to modified castor oil polyol is preferably 1:1, and then diisocyanate monomer is added according to the content of isocyanate groups required by the isocyanate polymer.

[0059] In a specific embodiment of the present invention, the diisocyanate may be any one of diphenylmethane diisocyanate MDI-100, diphenylmethane diisocyanate MDI-50, or carbodiimide-uretonimine-modified 4,4'-diphenylmethane diisocyanate MDI-100L, or a combination of at least two thereof.

[0060] In one specific embodiment of the present invention, the hydroxyl-terminated polybutadiene and modified castor oil polyol used in synthesizing the terminal isocyanate polymer are the same as those in component A.

[0061] In a specific embodiment of the present invention, the isocyanate content in the isocyanate polymer is 15-20%, such as 15%, 16%, 17%, 18%, 19% or 20%, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0062] In a specific embodiment of the present invention, the dehydrating agent can be a common dehydrating agent such as calcium oxide, molecular sieve or p-toluenesulfonic acid isocyanate.

[0063] In a specific embodiment of the present invention, the plasticizer can be any one of dipropylene glycol dibenzoate, alkyl phenyl sulfonate, diisononyl phthalate, diisooctyl phthalate or diisodecyl phthalate, or a combination of at least two thereof.

[0064] In one specific embodiment of the present invention, the carbon black is a special carbon black, such as any one of Cabot M-580, M-570, HZ6004 or KP15, or a combination of at least two thereof.

[0065] In one specific embodiment of the present invention, the preparation method of component B may include the following steps:

[0066] The isocyanate monomer, isocyanate polymer, dehydrating agent and plasticizer are mixed by vacuum stirring, and then carbon black is added and the mixture is continued to be mixed by vacuum stirring. After completion, the mixture is sealed and stored.

[0067] In one specific embodiment of the present invention, before preparing component B, the plasticizer and carbon black are subjected to a heating vacuum dehydration treatment.

[0068] In a specific embodiment of the present invention, the conditions of vacuum stirring and heating vacuum dehydration treatment in the preparation method of component B can be adjusted according to the specific selection and added weight of the raw materials of component B, and are not specifically limited here.

[0069] For the convenience of understanding the present invention, the present invention lists the following embodiments. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0070] Examples 1-4 of the present invention and comparative examples 1-4 respectively provide two-component polyurethane sealants for coated glass, and the weight proportions of the components are shown in Table 1.

[0071] Table 1

[0072] In the two-component polyurethane sealants for coated glass provided in Examples 1-4 and Comparative Examples 1-4, the specific selection of each raw material is as follows:

[0073] Component A:

[0074] The hydroxyl-terminated polybutadiene is Evonik Poly bdR-45HTLO;

[0075] The modified castor oil polyol is Ito URICH-1824;

[0076] The chain extender is 2-ethyl-1,3-hexanediol (EHD);

[0077] The plasticizer is MESAMOLL;

[0078] The light stabilizer is TINUVIN 292;

[0079] Antioxidant TP-10H;

[0080] The catalyst is Evonik Polycat SA20;

[0081] Silane coupling agent 1 is γ-aminopropyltriethoxysilane, and silane coupling agent 2 is thiosilicic acid, O,O,O-triethyl-thio-[3-(triethoxysilyl)propyl] ester;

[0082] The filler is clay B-95;

[0083] The fumed silica is R202.

[0084] The preparation method of component A includes: adding polybutadiene polyvestHT, modified castor oil polyol, chain extender and plasticizer into a 5L planetary mixer according to the formula ratio, and stirring at medium speed for 15 minutes under vacuum; then adding filler clay, heating to 110-120°C, and stirring and dehydrating for 2-3 hours under vacuum, and testing the moisture content to be ≦300PPM and passing the test; cooling to below 50°C with cooling water, adding light stabilizer, antioxidant, coupling agent, fumed silica and catalyst, stirring evenly for 1 hour under vacuum, discharging the glue and sealing for storage.

[0085] Component B:

[0086] The isocyanate monomer is modified isocyanate WANNATE® PM8236;

[0087] The isocyanate polymer is as follows: 360 g of polyvestHT and 360 g of modified castor oil polyol URICH-1824 are added into a three-necked flask, heated to 60° C., and 620 g of MDI-100L are added; the temperature is raised to 80° C. and reacted for 3 hours to obtain an isocyanate polymer with an NCO content of 16.3%;

[0088] The dehydrating agent is 4A molecular sieve activated powder;

[0089] The plasticizer is MESAMOLL;

[0090] The carbon black was M-580.

[0091] The preparation method of component B includes: putting carbon black into an oven, heating to 150-160°C for vacuum dehydration for 6 hours, and sealing and storing it for later use after the moisture content is tested to be ≤300PPM; adding plasticizer MESAMOLL into a three-necked flask, heating to 120°C for vacuum dehydration for 6 hours, and sealing and storing it for later use after the moisture content is tested to be ≤300PPM. Add isocyanate monomer, isocyanate polymer, dehydrating agent, and pretreated plasticizer into a 5L planetary mixer, vacuum and stir at medium speed for 10 minutes; add pretreated carbon black, stir evenly under vacuum conditions for 1 hour, produce glue and seal and store it.

[0092] Example 5

[0093] In this embodiment, in addition to the raw materials of component A including, by weight, 15 parts of hydroxyl-terminated polybutadiene, 35 parts of modified castor oil polyol, 0.5 parts of chain extender, 25 parts of plasticizer, 1.5 parts of light stabilizer and 1.5 parts of antioxidant, 3.0 parts of silane coupling agent composition (the mass ratio of silane coupling agent 1 to silane coupling agent 2 is 1:1), 50 parts of filler, 5 parts of fumed silica and 0.5 parts of catalyst, the raw materials of component B include 70 parts of isocyanate monomer, and the other conditions are the same as those in Example 2.

[0094] Example 6

[0095] In this embodiment, in addition to the raw materials of component A including, by weight, 35 parts of hydroxyl-terminated polybutadiene, 15 parts of modified castor oil polyol, 0.5 parts of chain extender, 15 parts of plasticizer, 0.2 parts of light stabilizer and 0.2 parts of antioxidant, 1.0 parts of silane coupling agent composition, 40 parts of filler, 2.5 parts of fumed silica and 0.25 parts of catalyst, the raw materials of component B include 70 parts of isocyanate monomer, and the other conditions are the same as those in Example 2.

[0096] Example 7

[0097] In this embodiment, except that the raw materials of component B include, by weight, 55 parts of isocyanate monomer, 10 parts of isocyanate polymer, 0.5 parts of dewatering agent, 8 parts of plasticizer, and 5 parts of carbon black, the other conditions are the same as those in Example 2.

[0098] Example 8

[0099] In this embodiment, except that the raw materials of component B include 80 parts of isocyanate monomer, 20 parts of isocyanate polymer, 3 parts of dehydrating agent, 15 parts of plasticizer, and 10 parts of carbon black, the other conditions are the same as those in Example 2.

[0100] Example 9

[0101] In this embodiment, except for the specific selection of each raw material of component A,

[0102] The hydroxyl-terminated polybutadiene is Evonik Poly bdR-45HTLO;

[0103] The modified castor oil polyol is Ito URICH-1830;

[0104] The chain extender is 1,6-hexanediol;

[0105] The plasticizer is dipropylene glycol dibenzoate;

[0106] The light stabilizer is TINUVIN770DF;

[0107] The antioxidant is antioxidant 1076;

[0108] The catalyst is dibutyltin dilaurate;

[0109] Silane coupling agent 1 is N-phenyl-3-aminopropyltrimethoxysilane, and silane coupling agent 2 is γ-mercaptopropyltrimethoxysilane;

[0110] The filler is clay B-95;

[0111] The fumed silica was Evonik R974.

[0112] The remaining conditions are the same as those in Example 2.

[0113] Example 10

[0114] In this embodiment, except for the specific selection of each raw material of component A,

[0115] The hydroxyl-terminated polybutadiene is Evonik Poly bdR-45M, 30 parts;

[0116] Modified castor oil polyol is Ito AC-006, 5 parts;

[0117] The chain extender is 1,4-butanediol, 0.1 part;

[0118] The plasticizer is diisononyl phthalate;

[0119] The light stabilizer is TINUVIN326;

[0120] The antioxidant is antioxidant 245;

[0121] The catalyst is dibutyltin diacetate;

[0122] Silane coupling agent 1 is 3-methacryloxypropyltrimethoxysilane, and silane coupling agent 2 is γ-mercaptopropyltriethoxysilane;

[0123] The filler is clay B-95;

[0124] The fumed silica was Cabot TS720.

[0125] The remaining conditions are the same as those in Example 2.

[0126] Embodiment 11

[0127] In this embodiment, except for the specific selection of each raw material of component B,

[0128] The isocyanate monomer is diphenylmethane diisocyanate (MDI-100);

[0129] The isocyanate polymer is as follows: 360 g of polyvestHT and 360 g of modified castor oil polyol URICH-1824 are added into a three-necked flask, heated to 60° C., and 620 g of MDI-10L are added; the temperature is raised to 80° C. and reacted for 3 hours to obtain an isocyanate polymer with an NCO content of 16.3%;

[0130] The water removal agent is p-toluenesulfonic acid isocyanate;

[0131] The plasticizer is dipropylene glycol dibenzoate;

[0132] The carbon black was M-570.

[0133] The remaining conditions are the same as those in Example 2.

[0134] Example 12

[0135] In this embodiment, except for the specific selection of each raw material of component B,

[0136] The isocyanate monomer is diphenylmethane diisocyanate (MDI-50);

[0137] The isocyanate polymer is as follows: 360 g of polyvestHT and 360 g of modified castor oil polyol URICH-1824 are added into a three-necked flask, heated to 60° C., and 620 g of MDI-10L are added; the temperature is raised to 80° C. and reacted for 3 hours to obtain an isocyanate polymer with an NCO content of 16.3%;

[0138] The water removal agent is p-toluenesulfonic acid isocyanate;

[0139] The plasticizer is diisononyl phthalate;

[0140] The carbon black is HZ-6004.

[0141] The remaining conditions are the same as those in Example 2.

[0142] The mechanical properties and anti-aging properties of the two-component polyurethane sealants for coated glass provided in Examples 1-12 and Comparative Examples 1-4 were tested. The number of samples is shown in Table 2, and the test results are shown in Table 3.

[0143] Table 2

[0144] Table 3

[0145] Standard conditions are: temperature (23±2)℃, relative humidity: (50±5)%.

[0146] Aging conditions of water-ultraviolet treated samples: According to the provisions of 5.12 of JC / T 485-2007, place the samples for 168 hours, and place them in a standard environment for 2 hours after taking them out.

[0147] Hot air sample aging conditions: temperature (60±2)℃, placement for 336h, and then place the sample in a standard environment for 2h.

[0148] Aging conditions for moisture and heat resistance samples: temperature (70±2)℃, relative humidity 95%, 300h. After the samples are taken out, place them in a standard environment for 2h.

[0149] Aging conditions for immersed specimens: (40±2)℃ constant temperature water bath for 72h, and then place the specimens in standard environment for 2h after removal.

[0150] High and low temperature salt spray aging conditions: placed in -30℃×16h→70℃×72h→salt spray×24h→-30℃×8h→salt spray×16h→70℃×8h→salt spray×24h for a total of two cycles. After the sample is taken out, place it in a standard environment for 2h.

[0151] The surface drying time shall be tested in accordance with GB / T 29755-2013 5.5; the applicable period shall be tested in accordance with GB / T 29755-2013 5.6; the elastic recovery rate shall be tested in accordance with GB / T 29755-2013 5.8; the fixed elongation adhesion shall be tested in accordance with GB / T 29755-20135.10; the tensile adhesion strength, elongation at maximum tensile strength and bonding failure area shall be tested in accordance with GB / T 29755-2013 5.9.

[0152] The test results analysis found that:

[0153] (1) The interpenetrating polyurethane network structure formed by the combination of hydroxyl-terminated polybutadiene and modified castor oil polyol in a mass ratio of 1:1 is stable; the silane coupling agent is a composite of silane coupling agent 1 and silane coupling agent 2 in equal proportions, and the tensile bonding strength is greater than 2.0 MPa, the elongation is moderate, and the fixed elongation bonding property is excellent.

[0154] (2) It was found in Examples 1-3 that when the catalyst content reached 0.2%, adhesion failure occurred during wet heat aging and water immersion aging.

[0155] (3) Comparative Example 2-3 uses a single silane coupling agent, and both the elongation adhesion and the broken area are poor.

[0156] (4) Comparative Example 1 uses a single hydroxyl-terminated polybutadiene, and the tensile bonding strength is low, and the elongation is high; Comparative Example 4 uses a single modified castor oil polyol, and the fixed tensile bonding and failure area are poor, and the elongation is low.

[0157] (5) The results of Example 4 showed that as the content of silane coupling agent 1 and silane coupling agent 2 increased, the tensile bonding strength decreased.

[0158] (6) Example 2: 15% each of polybutadiene and castor oil polyol, 1.0% each of silane coupling agent 1 and silane coupling agent 2, and 0.15% of catalyst. The formula ratio has the best performance.

[0159] The present invention illustrates the detailed process equipment and process flow of the present invention through the above-mentioned embodiments, but the present invention is not limited to the above-mentioned detailed process equipment and process flow, that is, it does not mean that the present invention must rely on the above-mentioned detailed process equipment and 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. A two-component polyurethane sealant for coated glass, characterized in that: The two-component polyurethane sealant for coated glass comprises component A and component B; The A component includes hydroxyl-terminated polybutadiene and modified castor oil polyol; The B component includes an isocyanate monomer.

2. The two-component polyurethane sealant for coated glass according to claim 1, characterized in that: In parts by weight, the component A includes 15 to 35 parts of hydroxyl-terminated polybutadiene and 15 to 35 parts of modified castor oil polyol.

3. The two-component polyurethane sealant for coated glass according to claim 1, characterized in that: The hydroxyl-terminated polybutadiene has a weight average molecular weight of 2000-4000 g / mol and a hydroxyl value of 30-68 mgKOH / g.

4. The two-component polyurethane sealant for coated glass according to claim 1, characterized in that: The weight average molecular weight of the modified castor oil polyol is 500-2500 g / mol.

5. The two-component polyurethane sealant for coated glass according to claim 1, characterized in that: In parts by weight, the component A also includes: 0-0.5 parts of chain extender, 15-25 parts of plasticizer, 0-1.5 parts of light stabilizer, 0-1.5 parts of antioxidant, 1.0-3.0 parts of silane coupling agent composition, 40-50 parts of filler, 1-5 parts of fumed silica and 0.1-0.5 parts of catalyst.

6. The two-component polyurethane sealant for coated glass according to claim 5, characterized in that: The silane coupling agent composition comprises a combination of at least two of N-phenyl-3-aminopropyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, γ-glycidoxypropylmethyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-mercaptopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane or thiosilicate, O,O,O-triethyl-sulfo-[3-(triethoxysilyl)propyl] ester.

7. The two-component polyurethane sealant for coated glass according to claim 1, characterized in that: The B component includes 55 to 80 parts of isocyanate monomer.

8. The two-component polyurethane sealant for coated glass according to claim 1, characterized in that: The isocyanate monomer includes any one of diphenylmethane diisocyanate MDI-100, diphenylmethane diisocyanate MDI-50, carbodiimide-uretonimine modified 4,4'-diphenylmethane diisocyanate MDI-100L, polymeric isocyanate WANNATE® PM-200 or modified isocyanate WANNATE® PM8236, or a combination of at least two thereof.

9. The two-component polyurethane sealant for coated glass according to claim 1, characterized in that: In parts by weight, the B component further includes: 0-20 parts of isocyanate polymer, 0.5-3 parts of water remover, 8-15 parts of plasticizer, and 5-10 parts of carbon black.

10. The two-component polyurethane sealant for coated glass according to claim 9, characterized in that: The isocyanate polymer is a terminal isocyanate polymer obtained by reacting a diisocyanate monomer with a hydroxyl-terminated polybutadiene and a modified castor oil polyol; The isocyanate group content in the isocyanate polymer is 15-20%.

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