Filling joint glue material with no sagging and preparation method thereof

Abstract

This invention relates to the field of joint sealant materials, specifically to a non-sagging joint sealant material for facades and its preparation method. The non-sagging joint sealant material comprises component A, containing polyether polyol, and component B, containing isocyanate, with a mass ratio of component A to component B of 1.5:1. Component A includes the following components: polyether polyol A, polyether polyol B, filler, chain extender A, chain extender B, light stabilizer, antioxidant, catalyst, reinforcing agent, defoamer, rheology modifier A, rheology modifier B, and dispersant. Component B includes the following components by weight percentage: polyether polyol A, liquefied MDI, defoamer, rheology modifier A, and rheology modifier B. This invention uses fumed silica as a reinforcing agent, which increases both strength and thixotropy of the material, effectively preventing sagging.

Description

Technical Field

[0001] This invention relates to the field of joint sealant materials, specifically to a non-sagging joint sealant material for facades and its preparation method. Background Technology

[0002] As an important repair material, joint sealant is mainly used in four major areas: waterproofing, antibacterial properties, sealing, and surface decoration. For example, joint sealant is used in road and wall expansion joints; filling expansion joints is the earliest and most widely applied area of ​​joint sealant technology. Other applications include sealing various building expansion joints, deformation joints, and construction joints; sealing and decorating various ceramic and stone flooring surfaces; sealing and decorating building walls and cladding panels; and sealing containers and refrigerated trucks. Joint sealant will provide China's future infrastructure construction with a highly stable anti-corrosion, waterproof, sealing, and decorative material, as well as the most convenient and quick application method, for road repair, wall repair, bridge and building crack repair, structural surface corrosion protection, and bonding of various components.

[0003] Traditional single-component sealant has the following problems: inconvenient storage, short working time, easy foaming during wet curing, small adjustable range, easy sagging when repairing vertical joints (such as wall repair joints), resulting in uneven filling, shrinkage and collapse in some areas after curing, incomplete crack filling, new cracks, easy accumulation of dirt and grime, resulting in poor adhesion. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide a non-sagging sealant material for facades, which uses fumed silica as a reinforcing agent to increase strength and thixotropy of the material, effectively preventing sagging.

[0005] Another objective of this invention is to provide a method for preparing a non-drip sealant material for facades, which is simple to prepare, easy to implement, and greatly improves production efficiency.

[0006] This invention is achieved using the following technical solution:

[0007] The aforementioned non-drip sealant material for facades comprises component A containing polyether polyol and component B containing isocyanate, with a mass ratio of component A to component B of 1.5:1.

[0008] Component A comprises the following ingredients by weight percentage:

[0009] Polyether polyol A: 36-38%;

[0010] Polyether polyol B: 20-23%;

[0011] Filler: 20-25%;

[0012] Chain extender A: 2-3%;

[0013] Chain extender B: 0.2-0.4%;

[0014] Light stabilizer: 0.5-1%;

[0015] Antioxidant: 0.5-1%;

[0016] Catalyst: 0.9-1.5%;

[0017] Reinforcing agent: 1-2%;

[0018] Defoamer: 0.1-0.2%;

[0019] Rheology modifier A: 4-5%;

[0020] Rheology modifier B: 4-5%;

[0021] Dispersant: 0.1-0.2%;

[0022] Component B comprises the following ingredients by weight percentage:

[0023] Polyether polyol A: 75-76%;

[0024] Liquefied MDI: 20-22%;

[0025] Defoamer: 0.1-0.2%;

[0026] Rheology modifier A: 2-2.5%;

[0027] Rheology modifier B: 2-2.5%;

[0028] The rheology modifier A is MT, and the rheology modifier B is ULTRA.

[0029] In component A, polyether polyol A has a functionality of 2, a hydroxyl value of 26.5-29.5 mgKOH / g, and a molecular weight of 4000. Polyether polyol B has a functionality of 3, a hydroxyl value of 32.5-35.5 mgKOH / g, and a molecular weight of 5000.

[0030] In the B component of the aforementioned non-sagging sealant material for facades, the polyether polyol A has a functionality of 2, a hydroxyl value of 26.5-29.5 mgKOH / g, and a molecular weight of 4000.

[0031] In the aforementioned facade non-sag sealant material, component A contains 400-mesh talc powder as filler, MOCA as chain extender A, 1,4-butanediol as chain extender B, UV326 as light stabilizer, 1010 as antioxidant, fumed silica as reinforcing agent, DG01 as catalyst, and silicone oil as defoamer.

[0032] The rheology modifier A is CRAYVALLAC®MT, the rheology modifier B is CRAYVALLAC®ULTRA, and the dispersant is Sanhe-9072.

[0033] CRAYVALLAC® MT is a micronized amide-modified hydrogenated castor oil rheology modifier suitable for both solvent-based and solvent-free systems. CRAYVALLAC® MT is suitable for systems based on aliphatic hydrocarbons, aromatic hydrocarbons, and aromatic hydrocarbon / alcohol mixtures. Compared to the most basic hydrogenated castor oil-based rheology modifiers, CRAYVALLAC® MT is more resistant to stronger solvents. CRAYVALLAC® MT particles transform into an interactive network of fibrous particles upon activation. This network produces the shear-thinning rheology of the final coating. This shear-thinning property provides very high viscosity at low shear rates associated with sedimentation and low viscosity at much higher application shear rates. This results in greater edge coverage, stronger adhesion, and also increased shrinkage resistance, corrosion resistance, and chemical resistance. It extends service life and prevents sagging on vertical surfaces.

[0034] The rheology modifier is a pure polyamide, particularly recommended for use in 2K epoxy primers due to its robustness. CRAYVALLAC® ULTRA is a micronized amide wax rheology modifier that provides excellent recoatability for environmentally curing solvent-based epoxy coatings. CRAYVALLAC® ULTRA is designed to overcome the difficulties associated with older organic wax rheology modifiers, such as seeding, pseudoparticles, and migration of easily soluble substances to the surface. Therefore, coatings formulated with CRAYVALLAC® ULTRA exhibit enhanced performance and excellent recoatability when used in strong solvent systems.

[0035] The preparation method of the aforementioned non-drip sealant material for facades includes the following steps:

[0036] (1) Add polyether polyol A, polyether polyol B, filler, chain extender A, chain extender B, light stabilizer and antioxidant from component A to the reactor, heat to 90-95℃, vacuum dehydrate for 1.5h-2h, then cool to below 80℃, add defoamer and catalyst, stir for 0.5h; then add reinforcing agent, rheology modifier A, rheology modifier B and dispersant to the tank using high-speed dispersant, turn on the disperser, stir at 700-800r / min for 0.5-1h and then discharge to obtain component A;

[0037] (2) Preparation method of component B: First, add polyether polyol A, turn on the stirring and heating device, raise the temperature to 80-85℃, and then dehydrate and degas under vacuum for 1 hour; then cool down to below 60℃, add liquefied MDI, and react at 80-85℃ for 3 hours; then cool down to below 75℃, add defoamer; then add rheology modifier A, rheology modifier B and dispersant to the mixing tank with high-speed dispersant, turn on the disperser, stir at a speed of 700-800 r / min for 0.5-1 hours, and then discharge to obtain component B;

[0038] (3) After mixing components A and B evenly, a non-drip sealant material for vertical surfaces is obtained.

[0039] In step (3), the mixing conditions are: stirring at 800 r / min for 1-2 h.

[0040] Compared with the prior art, the beneficial effects of the present invention are:

[0041] (1) This invention uses fumed silica as a reinforcing agent, which increases both strength and thixotropy of the material, effectively preventing sagging. Simultaneously, the coating formulated with CRAYVALLAC® ULTRA in this invention exhibits enhanced performance and excellent recoatability. The shear-thinning properties of CRAYVALLAC® MT provide very high viscosity at low shear rates associated with sedimentation and low viscosity at much higher application shear rates. This results in higher edge coverage, stronger adhesion, and increased shrinkage resistance, corrosion resistance, and chemical resistance. It extends service life and prevents sagging on vertical surfaces.

[0042] (2) The non-drip sealant material for facades prepared by the present invention has excellent performance, with a resilience of ≥80%, tensile strength of ≥5 MPa, and elongation at break of ≥1000%. Detailed Implementation

[0043] To make the objectives and technical solutions of this invention clearer, the invention will be further described in detail below.

[0044] DL-4000: A commercially available product of Zibo Dexin Federal Chemical Industry Co., Ltd.

[0045] 330NG: A commercially available product of Zibo Dexin Federal Chemical Industry Co., Ltd.

[0046] 400-mesh talc powder: a commercially available product of Cangzhou Sizhou New Material Technology Co., Ltd.

[0047] MOCA: Commercially available products of Huaibei Xingguang New Materials Technology Co., Ltd.

[0048] 1,4-Butanediol: A commercially available product of Shandong Juyueyang New Material Technology Co., Ltd.

[0049] UV326: A product sold by Lianlong Supply Chain Management Co., Ltd.

[0050] 1010: Products sold by Lianlong Supply Chain Management Co., Ltd.

[0051] DG01: A commercially available product of Guangzhou Yourun Synthetic Materials Co., Ltd.

[0052] Fumed silica: A commercially available product of Taicang Xinhong Chemical Co., Ltd.

[0053] Organosilicon oil: Commercially available product of Beijing Huizhi Zhongcheng Science and Trade Co., Ltd.;

[0054] CRAYVALLAC®MT: A commercially available product from Shanghai Canal Materials Technology Co., Ltd.

[0055] CRAYVALLAC® ULTRA: A commercially available product from Shanghai Yunhe Materials Technology Co., Ltd.

[0056] Sanhe-9072: A commercially available product of Guangdong Sanhe Chemical Technology Co., Ltd.

[0057] YRFC-RG01: A commercially available product of Guangzhou Yourun Synthetic Materials Co., Ltd.

[0058] 3410B: A product sold by Hangzhou Xizhan Trading Co., Ltd.

[0059] Example 1

[0060] The non-drip sealant material for facades consists of component A, which contains polyether polyol, and component B, which contains isocyanate. The components A and B are mixed evenly in a mass ratio of 1.5:1.

[0061] Component A, containing polyether polyols, consists of the following materials in the following mass percentages:

[0062] DL-4000: 38%;

[0063] 330NG: 20.5%;

[0064] 400-mesh talc: 25%;

[0065] MOCA: 2%;

[0066] 1,4-Butanediol: 0.2%;

[0067] UV326: 0.5%;

[0068] 1010: 0.5%;

[0069] DG01: 0.9%;

[0070] Fumed silica: 2%;

[0071] Organosilicon oil: 0.2%;

[0072] CRAYVALLAC® MT: 5%;

[0073] CRAYVALLAC® ULTRA: 5%;

[0074] Sanhe-9072: 0.2%.

[0075] Preparation method: According to the weight percentage of the raw materials mentioned above, first add polyether polyol A, polyether polyol B, filler, chain extender A, chain extender B, light stabilizer, and antioxidant to the reactor according to the mass percentage. Heat to 95℃, dehydrate under vacuum for 2 hours (vacuum below -0.09 MPa), then cool to below 80℃, add defoamer and catalyst, and stir for 0.5 hours. Then, add reinforcing agent, rheology modifier A, rheology modifier B, and dispersant to the reactor according to the mass ratio using a high-speed dispersant. Start the disperser and stir at 800 r / min for 1 hour before discharging.

[0076] The isocyanate-containing component B comprises the following components by weight percentage:

[0077] Polyether polyol A: 75%;

[0078] Liquefied MDI: 20%;

[0079] Organosilicon oil: 0.2%;

[0080] CRAYVALLAC® MT: 2.4%;

[0081] CRAYVALLAC® ULTRA: 2.4%.

[0082] Preparation method: Based on the above raw materials, according to their weight percentages, first add polyether polyol A, start stirring, and heat the device. When the temperature reaches 80℃, vacuum dehydration and degassing (vacuum below -0.09MPa) is carried out for 1 hour. Then, cool down to below 60℃, add liquefied MDI, and react at 85℃ for 3 hours; then cool down to below 75℃ and add defoamer. Then, use a high-speed dispersant to add rheology modifier A, rheology modifier B, and dispersant to the mixing tank according to the mass ratio, start the disperser, and stir at 800 r / min for 1 hour before discharging.

[0083] After mixing the ingredients in Example 1 according to the specified ratio, pour the mixture into a mold coated with a release agent, wait for it to cure, and then demold. The properties of the resulting product are as follows:

[0084] Tensile strength: 7MPa; Elongation at break: 1100%; Resilience: 82%; Tensile bond strength ≥1MPa; Strength retention after heat aging (80℃, 168h) ≥95%.

[0085] Example 2

[0086] The non-drip sealant material for facades consists of component A, which contains polyether polyol, and component B, which contains isocyanate. The components A and B are mixed evenly in a mass ratio of 1.5:1.

[0087] Component A, containing polyether polyols, consists of the following materials in the following mass percentages:

[0088] DL-4000: 36%;

[0089] 330NG: 23%;

[0090] 400-mesh talc: 23.2%;

[0091] MOCA: 2.5%;

[0092] 1,4-Butanediol: 0.4%;

[0093] UV326: 1%;

[0094] 1010:1%;

[0095] DG01: 1.5%;

[0096] Fumed silica: 1%;

[0097] Organosilicon oil: 0.2%;

[0098] CRAYVALLAC® MT: 5%;

[0099] CRAYVALLAC® ULTRA: 5%;

[0100] Sanhe-9072: 0.2%.

[0101] Preparation method: According to the weight percentage of the raw materials mentioned above, first add polyether polyol A, polyether polyol B, filler, chain extender A, chain extender B, light stabilizer, and antioxidant to the reactor according to the mass percentage. Heat to 90℃, dehydrate under vacuum for 2 hours (vacuum below -0.09MPa), then cool to below 80℃, add defoamer and catalyst, and stir for 0.5 hours. Then, add reinforcing agent, rheology modifier A, rheology modifier B, and dispersant to the reactor according to the mass ratio using a high-speed dispersant. Start the disperser and stir at 800 r / min for 1 hour before discharging.

[0102] The isocyanate-containing component B comprises the following components by weight percentage:

[0103] Polyether polyol A: 75.8%;

[0104] Liquefied MDI: 20%;

[0105] Organosilicon oil: 0.2%;

[0106] CRAYVALLAC® MT: 2%;

[0107] CRAYVALLAC® ULTRA: 2%.

[0108] Preparation method: Based on the above raw materials, according to their weight percentages, first add polyether polyol A, start stirring, and heat the device to 85℃. Then, dehydrate and degas under vacuum (below -0.09MPa) for 1 hour. Then, cool down to below 60℃, add liquefied MDI, and react at 85℃ for 3 hours. Then, cool down to below 75℃ and add defoamer. Then, use a high-speed dispersant to add rheology modifier A, rheology modifier B, and dispersant to the mixing tank according to the mass ratio. Start the disperser and stir at 800 r / min for 1 hour before discharging.

[0109] After mixing the ingredients in Example 2 according to the specified ratio, pour the mixture into a mold coated with a release agent, wait for it to cure, and then demold. The properties of the resulting product are as follows:

[0110] Tensile strength: 8.5 MPa; Elongation at break: 950%; Resilience: 75%; Tensile bond strength ≥ 1 MPa; Strength retention after heat aging (80℃, 168h) ≥ 95%.

[0111] Example 3

[0112] The non-drip sealant material for facades consists of component A, which contains polyether polyol, and component B, which contains isocyanate. The components A and B are mixed evenly in a mass ratio of 1.5:1.

[0113] Component A, containing polyether polyols, consists of the following materials in the following mass percentages:

[0114] DL-4000: 37%;

[0115] 330NG: 21.1%;

[0116] 400-mesh talc: 24.2%;

[0117] MOCA: 3%;

[0118] 1,4-Butanediol: 0.3%;

[0119] UV326: 0.75%;

[0120] 1010: 0.75%;

[0121] DG01: 1.2%;

[0122] Fumed silica: 1.5%;

[0123] Organosilicon oil: 0.2%;

[0124] CRAYVALLAC® MT: 4.5%;

[0125] CRAYVALLAC® ULTRA: 4.5%;

[0126] Sanhe-9072: 0.2%.

[0127] Preparation method: According to the weight percentage of the raw materials mentioned above, first add polyether polyol A, polyether polyol B, filler, chain extender A, chain extender B, light stabilizer, and antioxidant to the reactor according to the mass percentage. Heat to 95℃, dehydrate under vacuum for 2 hours (vacuum below -0.09 MPa), then cool to below 80℃, add defoamer and catalyst, and stir for 0.5 hours. Then, add reinforcing agent, rheology modifier A, rheology modifier B, and dispersant to the reactor according to the mass ratio using a high-speed dispersant. Start the disperser and stir at 800 r / min for 1 hour before discharging.

[0128] The isocyanate-containing component B comprises the following components by weight percentage:

[0129] Polyether polyol A: 75%;

[0130] Liquefied MDI: 20.9%;

[0131] Organosilicon oil: 0.1%;

[0132] CRAYVALLAC® MT: 2%;

[0133] CRAYVALLAC® ULTRA: 2%.

[0134] Preparation method: Based on the above raw materials, according to their weight percentages, first add polyether polyol A, start stirring, and heat the device to 85℃. Then, dehydrate and degas under vacuum (below -0.09MPa) for 1 hour. Then, cool down to below 60℃, add liquefied MDI, and react at 85℃ for 3 hours. Then, cool down to below 75℃ and add defoamer. Then, use a high-speed dispersant to add rheology modifier A, rheology modifier B, and dispersant to the mixing tank according to the mass ratio. Start the disperser and stir at 800 r / min for 1 hour before discharging.

[0135] After mixing the ingredients in Example 3 according to the specified ratio, pour the mixture into a mold coated with a release agent, wait for it to cure, and then demold. The properties of the resulting product are as follows:

[0136] Tensile strength: 7.5 MPa; Elongation at break: 1010%; Resilience: 78%; Tensile bond strength ≥ 1 MPa; Strength retention after heat aging (80℃, 168h) ≥ 95%.

[0137] Comparative Example 1:

[0138] The difference from Example 1 is that the rheology modifiers MT and ULTRA are replaced with YRFC-RG01 in equal amounts. On the one hand, the common rheology modifier YRFC-RG01 migrates and floats during use, making it inconvenient and affecting its effectiveness and efficiency. It also tends to sag when used on vertical surfaces, resulting in decreased performance, poor tensile bond strength, and poor aging resistance. Test performance is as follows: tensile strength: 4 MPa; elongation at break: 500%; resilience: 60%; tensile bond strength ≥ 0.5 MPa; strength retention after heat aging (80℃, 168h) ≥ 80%.

[0139] Comparative Example 2:

[0140] The difference from Example 1 is that the rheology modifiers MT and ULTRA were replaced with 3410B in equal amounts. Acrylic rheology modifier 3410B exhibits poor thixotropic properties on vertical surfaces, requires large quantities, is costly, and necessitates high-speed dispersion to achieve the desired effect, placing high demands on on-site tools. Furthermore, its performance and bond strength are relatively poor. Tested properties are as follows: tensile strength: 5 MPa; elongation at break: 630%; resilience: 65%; tensile bond strength ≥ 0.5 MPa; strength retention after heat aging (80°C, 168 h) ≥ 80%.

[0141] Compared to conventional single-component sealants, this invention is a two-component product, which avoids the impact of humidity on the performance and effectiveness of single-component products. This invention is less affected by environmental factors, and therefore has a wider range of applications.

[0142] In summary, this invention uses fumed silica as a reinforcing agent, increasing both strength and thixotropy of the material, effectively preventing sagging. Simultaneously, the coating formulated with modified polyamide wax ULTRA exhibits enhanced performance and excellent recoatability. The shear-thinning properties of MT provide very high viscosity at low shear rates related to sedimentation and low viscosity at much higher application shear rates. This results in higher edge coverage, stronger adhesion, and increased shrinkage resistance, corrosion resistance, and chemical resistance. It extends service life and prevents sagging on vertical surfaces. Furthermore, this product is a two-component formulation, broadening its application range.

Claims

1. A non-drip sealant material for facades, characterized in that, It includes component A containing polyether polyol and component B containing isocyanate, with a mass ratio of component A to component B of 1.5:1; Component A comprises the following ingredients by weight percentage: Polyether polyol A: 36-38%; Polyether polyol B: 20-23%; Filler: 20-25%; Chain extender A: 2-3%; Chain extender B: 0.2-0.4%; Light stabilizer: 0.5-1%; Antioxidant: 0.5-1%; Catalyst: 0.9-1.5%; Reinforcing agent: 1-2%; Defoamer: 0.1-0.2%; Rheology modifier A: 4-5%; Rheology modifier B: 4-5%; Dispersant: 0.1-0.2%; Component B comprises the following ingredients by weight percentage: Polyether polyol A: 75-76%; Liquefied MDI: 20-22%; Defoamer: 0.1-0.2%; Rheology modifier A: 2-2.5%; Rheology modifier B: 2-2.5%; The rheology modifier A is micronized amide-modified hydrogenated castor oil CRAYVALLAC®MT, and the rheology modifier B is micronized amide wax CRAYVALLAC®ULTRA. In the aforementioned facade non-sagging sealant material, component A contains 400-mesh talc powder as filler, MOCA as chain extender A, 1,4-butanediol as chain extender B, UV326 as light stabilizer, 1010 as antioxidant, fumed silica as reinforcing agent, DG01 as catalyst, silicone oil as defoamer, and Sanhe-9072 as dispersant.

2. The non-drip sealant material for facades according to claim 1, characterized in that, In component A, the polyether polyol A has a functionality of 2, a hydroxyl value of 26.5-29.5 mgKOH / g, and a molecular weight of 4000.

3. The non-drip sealant material for facades according to claim 1, characterized in that, In component A, the polyether polyol B has a functionality of 3, a hydroxyl value of 32.5-35.5 mgKOH / g, and a molecular weight of 5000.

4. The non-drip sealant material for facades according to claim 1, characterized in that, In the B component of the aforementioned non-sagging sealant material for facades, the polyether polyol A has a functionality of 2, a hydroxyl value of 26.5-29.5 mgKOH / g, and a molecular weight of 4000.

5. A method for preparing a non-sag sealant material for facades as described in any one of claims 1-4, characterized in that, Includes the following steps: (1) Add polyether polyol A, polyether polyol B, filler, chain extender A, chain extender B, light stabilizer and antioxidant from component A to the reactor, heat to 90-95℃, vacuum dehydrate for 1.5h-2h, then cool to below 80℃, add defoamer and catalyst, stir for 0.5h; then add reinforcing agent, rheology modifier A, rheology modifier B and dispersant to the tank using a high-speed disperser, turn on the disperser, stir at 700-800r / min for 0.5-1h and then discharge to obtain component A; (2) Preparation method of component B: First, add polyether polyol A, turn on the stirring and heating device, raise the temperature to 80-85℃, and then dehydrate and degas under vacuum for 1 hour; then cool down to below 60℃, add liquefied MDI, and react at 80-85℃ for 3 hours; then cool down to below 75℃, add defoamer; then add rheology modifier A, rheology modifier B and dispersant to the mixing tank with high-speed dispersant, turn on the disperser, stir at a speed of 700-800 r / min for 0.5-1 hours, and then discharge to obtain component B; (3) After mixing components A and B, a non-drip sealant material for vertical surfaces is obtained.

6. The method for preparing the non-drip sealant material for facades according to claim 5, characterized in that, In step (3), the mixing conditions are: stirring at 800 r / min for 1-2 h.