A two-component polyurethane sealant for coated glass

Abstract

The present invention belongs to the field of adhesive materials and relates to a two-component polyurethane sealant for coated glass. The sealant comprises Component A and Component B; Component A comprises hydroxyl-terminated polybutadiene and modified castor oil polyol; Component B comprises isocyanate monomer. This sealant has excellent tensile adhesion performance and fixed elongation adhesion performance, as well as excellent weather resistance and anti-aging performance.

Description

Technical Field

[0001] The present 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 light transmittance, improve indoor comfort, but also has functions such as heat insulation, heat preservation, and ultraviolet protection. With the in-depth implementation of environmental protection and energy-saving policies, the market demand for high-performance building materials is increasing day by day. Coated glass, especially Low-E coated glass (low-emissivity glass), is gradually penetrating from the high-end large public building market to the civil residential field due to its excellent heat insulation and heat preservation performance and effective blocking of ultraviolet rays.

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

[0004] Currently, in the actual bonding process of coated glass, in order to prevent the sealant from failing due to chemical reaction with the coating layer; prevent the oxidation area from spreading towards the center of the glass after the coating layer is exposed to the air; prevent the adhesion of the glue to the coating layer from decreasing. Currently, in the bonding process of coated glass, generally a film removal wheel is used for film removal treatment, which causes the extension of time and man-hours, affects the production efficiency of enterprises, and increases production costs. Therefore, there is an urgent need in the market for a two-component polyurethane sealant that has good bonding to coated glass without the film removal process.

[0005] CN108795363A provides a two-component polyurethane sealant for insulating glass and its preparation method. The sealant includes component A and component B. This sealant has good water tightness and air tightness, and has good adhesiveness to the substrate.

[0006] CN105950102A discloses a high-elasticity recovery silicone sealant for insulating glass and its preparation method, which is mainly used for the secondary seal of insulating glass. Its feature is that this silicone sealant contains two components A and B. In addition to having good strength, elasticity and adhesiveness, and excellent aging resistance, the elastic recovery rate of the silicone sealant of the present invention is as high as 96%, which can greatly improve the service life of the insulating glass sealant. Summary of the Invention

[0007] To solve the above technical problems, the present application provides a two-component polyurethane sealant for coated glass, which has excellent tensile adhesion performance and elongation adhesion performance, as well as excellent weather resistance and anti-aging performance.

[0008] To achieve the above effects, the present invention adopts the following technical solutions:

[0009] The present invention provides a two-component polyurethane sealant for coated glass, which includes component A and component B.

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

[0011] Component B includes isocyanate monomer.

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

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

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

[0015] As a preferred technical solution of the present invention, by weight, component A further includes:

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

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

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

[0019] As a preferred technical solution of the present invention, the isocyanate monomer includes any one or a combination of at least two 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.

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

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

[0022] The content of isocyanate groups 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 adhesion performance and fixed elongation adhesion performance;

[0025] (2) The present invention provides a two-component polyurethane sealant for coated glass, which has excellent water-UV aging resistance, hot air environment aging resistance, damp heat environment aging resistance, immersion aging resistance, and salt spray environment aging resistance. Specific Embodiments

[0026] The technical solution of the present application will be further described below through specific embodiments.

[0027] The specific embodiments of the present invention provide a two-component polyurethane sealant for coated glass, which includes 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 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. In the sealant, hydroxyl-terminated polybutadiene and modified castor oil polyol are used in combination to improve the tensile adhesion strength, set elongation adhesion performance and anti-aging performance of the sealant. The main reason is that when hydroxyl-terminated polybutadiene and modified castor oil polyol react and cure with isocyanate, a directional and uniform interpenetrating structure can be formed. The non-polar structure of hydroxyl-terminated polybutadiene and the de-esterified, hydrogenated, and low hydroxyl value modified castor oil provide excellent tensile adhesion strength, set elongation adhesion performance and anti-aging performance, etc.

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

[0032] In a specific embodiment of the present invention, the weight average molecular weight of hydroxyl-terminated polybutadiene is 2000-4000 g / mol, and the hydroxyl value is 30-68 mgKOH / g. Among them, the weight average molecular weight of 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. Other unlisted values within the above numerical ranges are equally applicable.

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

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

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

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

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

[0038] Among them, the weight parts of the chain extender can be 0 parts, 0.1 part, 0.2 part, 0.3 part, 0.4 part or 0.5 part, etc., the weight parts 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 parts of the light stabilizer can be 0 parts, 0.1 part, 0.2 part, 0.5 part, 0.8 part, 1.2 part or 1.5 part, etc., the weight parts of the antioxidant can be 0 parts, 0.1 part, 0.2 part, 0.5 part, 0.8 part, 1.2 part or 1.5 part, etc., the weight parts of the silane coupling agent composition can be 1.0 part, 1.2 part, 1.5 part, 1.8 part, 2.0 part, 2.2 part, 2.5 part, 2.8 part or 3.0 part, etc., the weight parts of the 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 the fumed silica can be 1 part, 1.5 part, 2 part, 2.5 part, 3 part, 3.5 part, 4 part, 4.5 part or 5 part, etc., and the weight parts of the catalyst can be 0.1 part, 0.2 part, 0.5 part, 0.8 part, 1.2 part or 1.5 part, etc., but not limited to the listed values, and other unlisted values within the above numerical ranges are equally applicable.

[0039] In a specific embodiment of the present invention, 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 thiosilicic acid, O,O,O-triethyl-thio-[3-(triethoxysilyl)propyl] ester. Among them, typical but non-limiting examples of the combination include the combination of N-phenyl-3-aminopropyltrimethoxysilane and 3-methacryloxypropyltrimethoxysilane, the combination of 3-methacryloxypropyltrimethoxysilane and γ-glycidoxypropylmethyltrimethoxysilane, the combination of γ-glycidoxypropylmethyltrimethoxysilane and γ-mercaptopropyltrimethoxysilane, the combination of γ-mercaptopropyltrimethoxysilane and γ-mercaptopropyltriethoxysilane, the combination of γ-mercaptopropyltriethoxysilane and γ-aminopropyltrimethoxysilane, the combination of γ-aminopropyltrimethoxysilane and γ-aminopropyltriethoxysilane, the combination of γ-aminopropyltriethoxysilane and thiosilicic acid, O,O,O-triethyl-thio-[3-(triethoxysilyl)propyl] ester, etc.

[0040] In a specific embodiment of the present invention, in the silane coupling agent composition, when the silane coupling agent composition comprises 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 preferably 1.

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

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

[0043] In a specific embodiment of the present invention, the light stabilizer can be any one or a combination of at least two of BASF TINUVIN 292, TINUVIN770DF, TINUVIN326, TINUVIN P, or TINUVIN622.

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

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

[0046] In a 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 may be any one or a combination of at least two of zinc-bismuth composite catalyst, organotin catalyst, organobismuth catalyst, organozinc catalyst, organozirconium catalyst, Polycat SA series thermosensitive catalyst. Further preferably, it is any one or a combination of at least two of dibutyltin dichloride, dibutyltin dilaurate, stannous octoate or dibutyltin diacetate.

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

[0049] Mix hydroxyl-terminated polybutadiene, modified castor oil polyol, chain extender, plasticizer and retrograde agent by stirring to obtain a first mixture;

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

[0051] Cool the second mixture, add light stabilizer, antioxidant, silane coupling agent composition, fumed silica and catalyst, mix evenly under vacuum conditions, and then store it sealed.

[0052] In a specific embodiment of the present invention, the conditions of processes such as 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 conditions such as the added weight parts, and no further limitation is made here.

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

[0054] In a specific embodiment of the present invention, the isocyanate monomer includes any one or a combination of at least two 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.

[0055] In a specific embodiment of the present invention, by weight, the component B further includes: 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 parts by weight of the 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 parts by weight of the water scavenger can be 0.5 part, 1.0 part, 1.5 part, 2.0 part, 2.5 parts, or 3 parts, etc.; the parts by weight of the plasticizer can be 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, or 15 parts, etc.; the parts by weight of the carbon black can be 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, or 10 parts, etc. However, it is not limited to the listed values, and other unlisted values within the above numerical ranges are equally applicable.

[0057] In a specific embodiment 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.

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

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

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

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

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

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

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

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

[0066] Vacuum stir and mix the isocyanate monomer, isocyanate polymer, water scavenger and plasticizer, then add carbon black and continue to vacuum stir and mix, and seal and store after completion.

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

[0068] In a specific embodiment of the present invention, the conditions of vacuum stirring and heat vacuum dehydration treatment in the preparation method of component B can be adjusted according to the specific selection and added weight parts of the raw materials of component B, and no specific limitation is made here.

[0069] For the convenience of understanding the present invention, the following examples are listed. Those skilled in the art should understand that the examples are only for helping to understand the present invention and should not be regarded as specific limitations on the present invention.

[0070] Examples 1-4 and Comparative Examples 1-4 of the present invention respectively provide a two-component polyurethane sealant for coated glass, and the weight parts of each component are shown in Table 1.

[0071] Table 1

[0072]

[0073] In the two-component polyurethane sealants for coated glass provided by Examples 1-4 and Comparative Examples 1-4 respectively, the specific selections of each raw material are as follows:

[0074] Component A:

[0075] Hydroxyl-terminated polybutadiene is Evonik Poly bdR-45HTLO;

[0076] Modified castor oil polyol is Ito URICH-1824;

[0077] The chain extender is 2-ethyl-1,3-hexanediol (EHD);

[0078] The plasticizer is MESAMOLL;

[0079] The light stabilizer is TINUVIN 292;

[0080] The antioxidant is TP-10H;

[0081] The catalyst is Evonik Polycat SA20;

[0082] Silane coupling agent 1 is γ-aminopropyltriethoxysilane, and silane coupling agent 2 is O,O,O-triethyl-thio-[3-(triethoxysilyl)propyl] thiosilicate;

[0083] The filler is clay B-95;

[0084] The fumed silica is R202.

[0085] The preparation method of component A includes: adding polybutadiene polyvest HT, modified castor oil polyol, chain extender, and plasticizer into a 5L planetary mixer according to the formula ratio, vacuumizing and stirring at medium speed for 15 minutes; then adding the filler clay, heating to 110-120°C, and stirring and dehydrating under vacuum for 2-3 hours. After detecting that the moisture content is ≤ 300 PPM and passing the test; cooling with cooling water to below 50°C, adding light stabilizer, antioxidant, coupling agent, fumed silica and catalyst, and stirring evenly under vacuum conditions for 1 hour, discharging the glue and storing it sealed.

[0086] Component B:

[0087] The isocyanate monomer is modified isocyanate WANNATE® PM8236;

[0088] The isocyanate polymer is: adding 360g of polybutadiene polyvest HT and 360g of modified castor oil polyol URICH-1824 into a three-necked flask, heating to 60°C and adding 620g of MDI-100L; raising the temperature to 80°C and reacting for 3 hours to obtain an isocyanate polymer with an NCO content of 16.3%;

[0089] The water scavenger is 4A molecular sieve activated powder;

[0090] The plasticizer is MESAMOLL;

[0091] The carbon black is M-580.

[0092] The preparation method of component B includes: putting the carbon black into an oven, heating to 150-160°C and vacuum dehydrating for 6 hours. After detecting that the moisture content is ≤ 300 PPM and passing the test, storing it sealed for later use; adding the plasticizer MESAMOLL into a three-necked flask, heating to 120°C and vacuum dehydrating for 6 hours. After detecting that the moisture content is ≤ 300 PPM and passing the test, storing it sealed for later use. Adding the isocyanate monomer, isocyanate polymer, water scavenger, and pretreated plasticizer into a 5L planetary mixer, vacuumizing and stirring at medium speed for 10 minutes; adding the pretreated carbon black, and stirring evenly under vacuum conditions for 1 hour, discharging the glue and storing it sealed.

[0093] Example 5

[0094] In this example, except by weight, the raw materials of component A include 15 parts of hydroxyl-terminated polybutadiene, 35 parts of modified castor oil polyol, 0.5 part of chain extender, 25 parts of plasticizer, 1.5 parts of light stabilizer, 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 part 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.

[0095] Example 6

[0096] In this example, except by weight, the raw materials of component A include 35 parts of hydroxyl-terminated polybutadiene, 15 parts of modified castor oil polyol, 0.5 part of chain extender, 15 parts of plasticizer, 0.2 part of light stabilizer, 0.2 part of antioxidant, 1.0 part of silane coupling agent composition, 40 parts of filler, 2.5 parts of fumed silica, and 0.25 part 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.

[0097] Example 7

[0098] In this example, except by weight, the raw materials of component B include 55 parts of isocyanate monomer, 10 parts of isocyanate polymer, 0.5 part of water scavenger, 8 parts of plasticizer, and 5 parts of carbon black, and the other conditions are the same as those in Example 2.

[0099] Example 8

[0100] In this example, except by weight, the raw materials of component B include 80 parts of isocyanate monomer, 20 parts of isocyanate polymer, 3 parts of water scavenger, 15 parts of plasticizer, and 10 parts of carbon black, and the other conditions are the same as those in Example 2.

[0101] Example 9

[0102] In this example, the specific selection of each raw material of component A is as follows:

[0103] The hydroxyl-terminated polybutadiene is Evonik Poly bdR-45HTLO;

[0104] The modified castor oil polyol is Ito URICH-1830;

[0105] The chain extender is 1,6-hexanediol;

[0106] The plasticizer is dipropylene glycol dibenzoate;

[0107] The light stabilizer is TINUVIN770DF;

[0108] The antioxidant is antioxidant 1076;

[0109] The catalyst is dibutyltin dilaurate;

[0110] Silane coupling agent 1 is N-phenyl-3-aminopropyltrimethoxysilane, and silane coupling agent 2 is γ-mercaptopropyltrimethoxysilane;

[0111] The filler is clay B-95;

[0112] The fumed silica is Evonik R974.

[0113] All other conditions are the same as those in Example 2.

[0114] Example 10

[0115] In this example, the specific selections of the raw materials in Component A are as follows:

[0116] The hydroxyl-terminated polybutadiene is Evonik Poly bdR-45M, 30 parts;

[0117] The modified castor oil polyol is Itochu AC-006, 5 parts;

[0118] The chain extender is 1,4-butanediol, 0.1 part;

[0119] The plasticizer is diisononyl phthalate;

[0120] The light stabilizer is TINUVIN326;

[0121] The antioxidant is antioxidant 245;

[0122] The catalyst is dibutyltin diacetate;

[0123] Silane coupling agent 1 is 3-methacryloxypropyltrimethoxysilane, and silane coupling agent 2 is γ-mercaptopropyltriethoxysilane;

[0124] The filler is clay B-95;

[0125] The fumed silica is Cabot TS720.

[0126] All other conditions are the same as those in Example 2.

[0127] Example 11

[0128] In this example, the specific selections of the raw materials in Component B are as follows:

[0129] The isocyanate monomer is diphenylmethane diisocyanate (MDI-100);

[0130] The isocyanate polymer is prepared by adding 360 g of polybutadiene polyvest HT and 360 g of modified castor oil polyol URICH-1824 into a three-necked flask, heating to 60 °C, and adding 620 g of MDI-10L; then raising the temperature to 80 °C and reacting for 3 hours to obtain an isocyanate polymer with an NCO content of 16.3%.

[0131] The water scavenger is isocyanate p-toluenesulfonic acid.

[0132] The plasticizer is dipropylene glycol dibenzoate.

[0133] The carbon black is M-570.

[0134] All other conditions are the same as those in Example 2.

[0135] Example 12

[0136] In this example, the specific selection of each raw material in Component B is as follows:

[0137] The isocyanate monomer is diphenylmethane diisocyanate (MDI-50);

[0138] The isocyanate polymer is prepared by adding 360 g of polybutadiene polyvest HT and 360 g of modified castor oil polyol URICH-1824 into a three-necked flask, heating to 60 °C, and adding 620 g of MDI-10L; then raising the temperature to 80 °C and reacting for 3 hours to obtain an isocyanate polymer with an NCO content of 16.3%.

[0139] The water scavenger is isocyanate p-toluenesulfonic acid.

[0140] The plasticizer is diisononyl phthalate.

[0141] The carbon black is HZ-6004.

[0142] All other conditions are the same as those in Example 2.

[0143] The mechanical properties and anti-aging properties of the two-component polyurethane sealant for coated glass provided in Examples 1-12 and Comparative Examples 1-4 were tested. The number of specimens is shown in Table 2, and the test results are shown in Table 3.

[0144] Table 2

[0145]

[0146] Table 3

[0147]

[0148] Standard conditions refer to: temperature (23 ± 2) °C, relative humidity: (50 ± 5)%.

[0149] Aging conditions for water-ultraviolet treated specimens: In accordance with the provisions of 5.12 in JC / T 485-2007, place for 168 h. After the specimens are taken out, place them in the standard environment for 2 h.

[0150] Aging conditions for hot air specimens: Temperature (60 ± 2) °C, place for 336 h. After the specimens are taken out, place them in the standard environment for 2 h.

[0151] Aging conditions for specimens with resistance to damp heat: Temperature (70 ± 2) °C, relative humidity 95%, 300 h. After the specimens are taken out, place them in the standard environment for 2 h.

[0152] Aging conditions for immersed specimens: Constant temperature water bath at (40 ± 2) °C for 72 h. After the specimens are taken out, place them in the standard environment for 2 h.

[0153] Aging conditions for high and low temperature salt spray: Place at -30 °C × 16 h → 70 °C × 72 h → salt spray × 24 h → -30 °C × 8 h → salt spray × 16 h → 70 °C × 8 h → salt spray × 24 h for a total of two cycles. After the specimens are taken out, place them in the standard environment for 2 h.

[0154] The surface drying time is tested in accordance with the provisions of 5.5 in GB / T 29755-2013; the pot life is tested in accordance with the provisions of 5.6 in GB / T 29755-2013; the elastic recovery rate is tested in accordance with the provisions of 5.8 in GB / T 29755-2013; the fixed elongation adhesion is tested in accordance with the provisions of 5.10 in GB / T 29755-2013; the tensile adhesion strength, elongation at maximum tensile strength, and adhesion failure area are tested in accordance with the provisions of 5.9 in GB / T 29755-2013.

[0155] Analysis of the test results shows that:

[0156] (1) The interpenetrating polyurethane network structure formed by hydroxyl-terminated polybutadiene and modified castor oil polyol in a mass ratio of 1:1 is stable; the silane coupling agent uses a composite of silane coupling agent 1 and silane coupling agent 2 in equal proportions, with a tensile adhesion strength greater than 2.0 MPa, a moderate elongation rate, and excellent fixed elongation adhesion.

[0157] (2) It is found in Examples 1-3 that when the content of the catalyst reaches 0.2%, adhesive failure occurs in resistance to damp heat aging and immersion aging.

[0158] (3) In Comparative Examples 2-3, a single silane coupling agent is used, and both the fixed elongation adhesion and the failure area are poor.

[0159] (4) In Comparative Example 1, a single hydroxyl-terminated polybutadiene was used, resulting in a relatively low tensile adhesion strength and a relatively high elongation at break; in Comparative Example 4, a single modified castor oil polyol was used, showing poor fixed elongation adhesiveness and failure area, and a relatively low elongation at break.

[0160] (5) It was found in Example 4 that as the contents of silane coupling agent 1 and silane coupling agent 2 increased, the tensile adhesion strength decreased.

[0161] (6) In Example 2, with 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 performance of each item in the formulation ratio was the most excellent.

[0162] The present invention uses the above-mentioned examples to illustrate the detailed process equipment and process flow of the present invention. However, 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 to the present invention, the equivalent substitution of each raw material of the product of the present invention, the addition of auxiliary components, and the selection of specific methods, etc., all fall within the protection scope and the 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; 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; The B component includes an isocyanate monomer; The modified castor oil polyol includes any one of Ito URICH-1830, URICH-1824, AC-006, AC-009, H368, Vantelus M-365 or M-280, or a combination of at least two thereof; 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; The silane coupling agent composition includes a combination of at least two of N-phenyl-3-aminopropyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, γ-mercaptopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane or thiosilicate-O,O,O-triethyl-S-[3-(triethoxysilyl)propyl]ester.

2. 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.

3. 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.

4. 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.

5. 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.

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

7. The two-component polyurethane sealant for coated glass according to claim 6, characterized in that: The isocyanate group content in the isocyanate polymer is 15-20%.

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