A one-component hand-scraped polyurea material

Abstract

The invention relates to a one-component hand-scrape-coated polyurea material, which is composed of the following raw materials: 15-60 parts of isocyanate, 3-15 parts of epoxy compound, 40-70 parts of polyether polyol, 5-30 parts of amine compound, 20-35 parts of solvent, 15-35 parts of filler, 1-4 parts of pigment, 3-8 parts of auxiliary agent, 1-5 parts of thickener, 1-3 parts of antioxidant, and 1-4 parts of catalyst; wherein the isocyanate is a mixture of isocyanate A and isocyanate B; the isocyanate A is one or more of 1,4-cyclohexanedimethyl diisocyanate, methylenebisphenyl isocyanate, hexamethylene diisocyanate, and 3,3'-dichloro-4,4'-diisocyanate biphenyl; and the isocyanate B is acrylic isocyanate. The above scheme solves the problem of poor comprehensive performance of hand-scrape-coated polyurea materials in the related art.

Description

Technical Field

[0001] The invention relates to the technical field of one-component manual scraping polyurea material, in particular to one-component manual scraping polyurea material. Background Art

[0002] Polyurea material is an environmentally friendly material that has developed rapidly in recent years. At present, polyurea materials are divided into single-component polyurea materials and two-component polyurea materials according to whether multiple components need to be mixed. According to the construction method, they are mainly divided into spray-applied and hand-scrape-applied polyurea materials. The main components of existing hand-scrape-applied polyurea materials include hindered amine compounds and isocyanates. Since hindered amine compounds may undergo side reactions during the reaction with isocyanates to form polyurea segments, these side reactions may cause changes in the molecular weight of the product, structural defects or inhomogeneities, resulting in a decrease in the tensile strength and tear strength of the material, thereby affecting the overall performance of the polyurea material. Summary of the Invention

[0003] The present invention provides a single-component manual scraping polyurea material, which mainly solves the problem of poor comprehensive performance of the manual scraping polyurea material in the related art.

[0004] The technical solutions of the present invention are as follows:

[0005] A one-component hand-scrape-coated polyurea material, comprising the following raw materials: 15-60 parts of isocyanate, 3-15 parts of epoxy compound, 40-70 parts of polyether polyol, 5-30 parts of amine compound, 20-35 parts of solvent, 15-35 parts of filler, 1-4 parts of pigment, 3-8 parts of additive, 1-5 parts of thickener, 1-3 parts of antioxidant, and 1-4 parts of catalyst;

[0006] Among them, the isocyanate is a mixture of isocyanate A and isocyanate B, and the weight ratio of isocyanate A to isocyanate B is 1:3~9; the isocyanate A is one or more of 1,4-cyclohexanedimethyl diisocyanate, methylenebisphenyl isocyanate, hexamethylene diisocyanate, and 3,3'-dichloro-4,4'-diisocyanate biphenyl; the isocyanate B is acrylic isocyanate.

[0007] Furthermore, the polyether polyol is polytetramethylene glycol.

[0008] Furthermore, the epoxy compound is epoxy resin or epoxy stearate.

[0009] Furthermore, the amine compound is N,N-dimethylethylenediamine or N,N'-di(2-hydroxyethyl)ethylenediamine.

[0010] Furthermore, the filler is one or more of polypropylene particles, polyethylene particles, glass microbeads, and ceramic microbeads.

[0011] Furthermore, the mesh size of the filler is 150-500 mesh.

[0012] Furthermore, the auxiliary agent consists of a dispersant and a stabilizer.

[0013] Furthermore, the catalyst is one or more of dibutyl stannate, tri(diethylhexyl) lead oxide, and tributyl antimony oxide.

[0014] Furthermore, the method for preparing the one-component manual scraping polyurea material comprises the following steps:

[0015] Step 2.1: Isocyanate, epoxy compound, polyether polyol and amine compound are packed in different containers and then placed in a vacuum dryer for drying and dehydration at a vacuum degree of 10 -3 -10 -2 mbar, drying temperature is 25-60℃, drying time is 2h-5h, then cooled to 20-30℃;

[0016] Step 2.2: Preheat the reaction vessel in a warm water bath to 25-50°C. Gradually add the isocyanate to the reaction vessel, followed by the epoxy compound, solvent, filler, and pigment. Stir and maintain the mixture at this temperature for 5-10 minutes at a stirring rate of 200-600 rpm.

[0017] Step 2.3: Heat the water bath to 50-80°C, slowly add the polyether polyol during the heating process, and stir and mix for 5-10 minutes at a stirring rate of 200-600 rpm;

[0018] Step 2.4: Heat the water bath to 80-100°C, slowly add the amine compound during the heating process, and stir and mix for 5-10 minutes at a stirring rate of 200-600 rpm;

[0019] In step 2.5, an auxiliary agent, a thickener, an antioxidant, and a catalyst are added, the temperature is lowered to 65-85° C., the mixture is stirred and reacted for 2-4 hours, and then the temperature is lowered to 25-30° C. to obtain a single-component hand-scraped polyurea material.

[0020] Furthermore, the solvent is one or more of acetone, toluene, methyl ethyl ketone, and dimethylformamide;

[0021] Furthermore, the pigment is one or more of phthalocyanine blue pigment, aromatic amine pigment, and phthalocyanine green pigment;

[0022] Furthermore, the dispersant is one or more of dodecylphenyl phosphate, trimethoxy phosphate, sodium polyacrylate, and epoxy stearin;

[0023] Furthermore, the stabilizer is dibutyltin dilaurate or isopropyltriethoxysilane;

[0024] Furthermore, the thickener is silicon dioxide or aluminum hydroxide;

[0025] Furthermore, the antioxidant is a phosphoric acid antioxidant or a phenolic antioxidant.

[0026] The beneficial effects of the present invention are:

[0027] In the present invention, isocyanate A is one or more of 1,4-cyclohexanedimethyl diisocyanate, methylenebisphenyl isocyanate, hexamethylene diisocyanate, and 3,3'-dichloro-4,4'-diisocyanate biphenyl; isocyanate B is acrylic isocyanate; a polymerization reaction initiated by a mixture of isocyanate A and isocyanate B can form a cross-linked structure, thereby improving the tensile strength and tear strength of the polyurea material; the mixture of isocyanate B and isocyanate A has low volatility and no irritating odor, which can reduce potential hazards to the working environment and operators; the introduction of isocyanate B can also quickly initiate a polymerization reaction, promote the rapid curing of the polyurea material, help improve construction efficiency and accelerate the project cycle; the addition of epoxide further improves the tensile strength and tear strength of the polyurea material, thereby expanding the application range of the polyurea material. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the invention contents of the present invention in conjunction with specific embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0029] In the following examples and comparative examples:

[0030] Acrylic isocyanate, model EBECRYL 4765, was purchased from Shanghai Yijun Warehousing Co., Ltd.

[0031] Aromatic amine pigment, model PR122, purchased from Hoechst;

[0032] Phosphate-type antioxidant, model DPA, was purchased from Huihai Biotechnology Co., Ltd., Tianjin, China;

[0033] Sodium polyacrylate was purchased from Jiangsu Chenxin Fine Chemical Co., Ltd.

[0034] Polypropylene pellets were purchased from Sinopec Group Co., Ltd.

[0035] Hexamethylene diisocyanate, CAS number: 822-06-0, purchased from Macklin;

[0036] Methylene bisphenyl isocyanate, CAS number: 9016-87-9, purchased from Macklin;

[0037] 1,4-Cyclohexanedimethyl diisocyanate, CAS No. 10347-54-3, purchased from Macklin;

[0038] 3,3'-Dichloro-4,4'-diisocyanate biphenyl, CAS number: 5331-87-3, was purchased from Macklin.

[0039] Example 1

[0040] A one-component hand-scraped polyurea material in this embodiment includes the following raw materials:

[0041] 15 parts of isocyanate, 3 parts of epoxy stearate, 40 parts of polytetramethylene glycol, 5 parts of N,N-dimethylethylenediamine, 20 parts of toluene, 15 parts of polypropylene particles, 1 part of aromatic amine pigment, 3 parts of sodium polyacrylate, 3 parts of dibutyltin dilaurate, 1 part of silicon dioxide, 1 part of phosphoric acid type antioxidant, 1 part of tributyl antimony oxide;

[0042] The isocyanate is a mixture of acrylic isocyanate and hexamethylene diisocyanate, and the weight ratio of the acrylic isocyanate to the hexamethylene diisocyanate is 1:3.

[0043] A one-component hand-coated polyurea material in this embodiment is prepared by the following method:

[0044] Step 2.1: Isocyanate, epoxy stearate, polytetrahydrofuranol, and N,N-dimethylethylenediamine were packed in different containers and then placed in a vacuum desiccator for drying and dehydration at a vacuum degree of 10 -2 mbar, drying temperature was 50°C, drying time was 3 h, and then cooled to 25°C;

[0045] Step 2.2: Preheat the reaction vessel to 50°C in a warm water bath. Gradually add the isocyanate to the reaction vessel, followed by the epoxy stearate, toluene, polypropylene particles, and aromatic amine pigment. Stir and maintain the temperature for 5 minutes at a stirring rate of 400 rpm.

[0046] Step 2.3: Heat the water bath to 70°C, slowly add polytetrahydrofuran alcohol during the heating process, and stir and mix for 5 minutes at a stirring rate of 400 rpm;

[0047] Step 2.4: Heat the water bath to 100°C. Slowly add N,N-dimethylethylenediamine while heating. Maintain the temperature and stir for 5 minutes at a stirring rate of 400 rpm.

[0048] In step 2.5, sodium polyacrylate, dibutyltin disilicate, silicon dioxide, a phosphoric acid antioxidant, and tributyl antimony oxide are added, the temperature is lowered to 75° C., and the mixture is stirred for reaction for 3 hours. The temperature is then lowered to 25° C. to obtain a one-component hand-scrape-coated polyurea material.

[0049] Example 2

[0050] A one-component hand-scraped polyurea material in this embodiment includes the following raw materials:

[0051] 15 parts of isocyanate, 3 parts of epoxy stearate, 40 parts of polytetramethylene glycol, 5 parts of N,N-dimethylethylenediamine, 20 parts of toluene, 15 parts of polypropylene particles, 1 part of aromatic amine pigment, 3 parts of sodium polyacrylate, 3 parts of dibutyltin dilaurate, 1 part of silicon dioxide, 1 part of phosphoric acid type antioxidant, 1 part of tributyl antimony oxide;

[0052] The isocyanate is a mixture of acrylic isocyanate and hexamethylene diisocyanate, and the weight ratio of the acrylic isocyanate to the hexamethylene diisocyanate is 1:5.

[0053] A one-component hand-coated polyurea material in this embodiment is prepared by the following method:

[0054] Step 2.1: Isocyanate, epoxy stearate, polytetrahydrofuranol, and N,N-dimethylethylenediamine were packed in different containers and then placed in a vacuum desiccator for drying and dehydration at a vacuum degree of 10 -2 mbar, drying temperature was 50°C, drying time was 3 h, and then cooled to 25°C;

[0055] Step 2.2: Preheat the reaction vessel to 50°C in a warm water bath. Gradually add the isocyanate to the reaction vessel, followed by the epoxy stearate, toluene, polypropylene particles, and aromatic amine pigment. Stir and maintain the temperature for 5 minutes at a stirring rate of 400 rpm.

[0056] Step 2.3: Heat the water bath to 70°C, slowly add polytetrahydrofuran alcohol during the heating process, and stir and mix for 5 minutes at a stirring rate of 400 rpm;

[0057] Step 2.4: Heat the water bath to 100°C. Slowly add N,N-dimethylethylenediamine while heating. Maintain the temperature and stir for 5 minutes at a stirring rate of 400 rpm.

[0058] In step 2.5, sodium polyacrylate, dibutyltin disilicate, silicon dioxide, a phosphoric acid antioxidant, and tributyl antimony oxide are added, the temperature is lowered to 75° C., and the mixture is stirred for reaction for 3 hours. The temperature is then lowered to 25° C. to obtain a one-component hand-scrape-coated polyurea material.

[0059] Example 3

[0060] A one-component hand-scraped polyurea material in this embodiment includes the following raw materials:

[0061] 15 parts of isocyanate, 3 parts of epoxy stearate, 40 parts of polytetramethylene glycol, 5 parts of N,N-dimethylethylenediamine, 20 parts of toluene, 15 parts of polypropylene particles, 1 part of aromatic amine pigment, 3 parts of sodium polyacrylate, 3 parts of dibutyltin dilaurate, 1 part of silicon dioxide, 1 part of phosphoric acid type antioxidant, 1 part of tributyl antimony oxide;

[0062] The isocyanate is a mixture of acrylic isocyanate and hexamethylene diisocyanate, and the weight ratio of the acrylic isocyanate to the hexamethylene diisocyanate is 1:9.

[0063] A one-component hand-coated polyurea material in this embodiment is prepared by the following method:

[0064] Step 2.1: Isocyanate, epoxy stearate, polytetrahydrofuranol, and N,N-dimethylethylenediamine were packed in different containers and then placed in a vacuum desiccator for drying and dehydration at a vacuum degree of 10 -2 mbar, drying temperature was 50°C, drying time was 3 h, and then cooled to 25°C;

[0065] Step 2.2: Preheat the reaction vessel to 50°C in a warm water bath. Gradually add the isocyanate to the reaction vessel, followed by the epoxy stearate, toluene, polypropylene particles, and aromatic amine pigment. Stir and maintain the temperature for 5 minutes at a stirring rate of 400 rpm.

[0066] Step 2.3: Heat the water bath to 70°C, slowly add polytetrahydrofuran alcohol during the heating process, and stir and mix for 5 minutes at a stirring rate of 400 rpm;

[0067] Step 2.4: Heat the water bath to 100°C. Slowly add N,N-dimethylethylenediamine while heating. Maintain the temperature and stir for 5 minutes at a stirring rate of 400 rpm.

[0068] In step 2.5, sodium polyacrylate, dibutyltin disilicate, silicon dioxide, a phosphoric acid antioxidant, and tributyl antimony oxide are added, the temperature is lowered to 75° C., and the mixture is stirred for reaction for 3 hours. The temperature is then lowered to 25° C. to obtain a one-component hand-scrape-coated polyurea material.

[0069] Example 4

[0070] A one-component hand-scraped polyurea material in this embodiment includes the following raw materials:

[0071] 40 parts of isocyanate, 13 parts of epoxy stearate, 60 parts of polytetramethylene glycol, 20 parts of N,N-dimethylethylenediamine, 30 parts of toluene, 25 parts of polypropylene particles, 3 parts of aromatic amine pigment, 5 parts of sodium polyacrylate, 3 parts of dibutyltin dilaurate, 4 parts of silicon dioxide, 2 parts of phosphoric acid type antioxidant, 3 parts of tributyl antimony oxide;

[0072] The isocyanate is a mixture of acrylic isocyanate and hexamethylene diisocyanate, and the weight ratio of the acrylic isocyanate to the hexamethylene diisocyanate is 1:3.

[0073] A one-component hand-coated polyurea material in this embodiment is prepared by the following method:

[0074] Step 2.1: Isocyanate, epoxy stearate, polytetrahydrofuranol, and N,N-dimethylethylenediamine were packed in different containers and then placed in a vacuum desiccator for drying and dehydration at a vacuum degree of 10 -3 mbar, drying temperature was 25°C, drying time was 2 h, and then cooled to 20°C;

[0075] Step 2.2: Preheat the reaction vessel to 25°C in a warm water bath. Gradually add the isocyanate to the reaction vessel, followed by the epoxy stearate, toluene, polypropylene particles, and aromatic amine pigment. Stir and maintain the temperature for 5 minutes at a stirring rate of 200 rpm.

[0076] Step 2.3: Heat the water bath to 50°C, slowly add polytetrahydrofuran alcohol during the heating process, and stir and mix for 5 minutes at a stirring rate of 200 rpm;

[0077] Step 2.4: Heat the water bath to 80°C. Slowly add N,N-dimethylethylenediamine while heating. Maintain the temperature and stir for 5 minutes at a stirring rate of 200 rpm.

[0078] In step 2.5, sodium polyacrylate, dibutyltin disilicate, silicon dioxide, a phosphoric acid antioxidant, and tributyl antimony oxide are added, the temperature is lowered to 65° C., stirred and reacted for 2 h, and then the temperature is lowered to 25° C. to obtain a one-component hand-scrape-coated polyurea material.

[0079] Example 5

[0080] A one-component hand-scraped polyurea material in this embodiment includes the following raw materials:

[0081] 40 parts of isocyanate, 13 parts of epoxy stearate, 60 parts of polytetramethylene glycol, 20 parts of N,N-dimethylethylenediamine, 30 parts of toluene, 25 parts of polypropylene particles, 3 parts of aromatic amine pigment, 5 parts of sodium polyacrylate, 3 parts of dibutyltin dilaurate, 4 parts of silicon dioxide, 2 parts of phosphoric acid type antioxidant, 3 parts of tributyl antimony oxide;

[0082] The isocyanate is a mixture of acrylic isocyanate and hexamethylene diisocyanate, and the weight ratio of the acrylic isocyanate to the hexamethylene diisocyanate is 1:5.

[0083] A one-component hand-coated polyurea material in this embodiment is prepared by the following method:

[0084] Step 2.1: Isocyanate, epoxy stearate, polytetrahydrofuranol, and N,N-dimethylethylenediamine were packed in different containers and then placed in a vacuum desiccator for drying and dehydration at a vacuum degree of 1 / 5×10 -2 mbar, drying temperature was 45°C, drying time was 3 h, and then cooled to 25°C;

[0085] Step 2.2: Preheat the reaction vessel to 35°C in a warm water bath. Gradually add the isocyanate to the reaction vessel, followed by the epoxy stearate, toluene, polypropylene particles, and aromatic amine pigment. Stir and maintain the temperature for 7 minutes at a stirring rate of 400 rpm.

[0086] Step 2.3: Heat the water bath to 60°C, slowly add polytetrahydrofuran alcohol during the heating process, and stir and mix at the same temperature for 7 minutes at a stirring rate of 400 rpm.

[0087] Step 2.4: Heat the water bath to 90°C. Slowly add N,N-dimethylethylenediamine while heating. Maintain the temperature and stir for 7 minutes at a stirring rate of 400 rpm.

[0088] In step 2.5, sodium polyacrylate, dibutyltin disilicate, silicon dioxide, a phosphoric acid antioxidant, and tributyl antimony oxide are added, the temperature is lowered to 75° C., and the mixture is stirred for reaction for 3 hours. The temperature is then lowered to 27° C. to obtain a one-component hand-scrape-coated polyurea material.

[0089] Example 6

[0090] A one-component hand-scraped polyurea material in this embodiment includes the following raw materials:

[0091] 40 parts of isocyanate, 13 parts of epoxy stearate, 60 parts of polytetramethylene glycol, 20 parts of N,N-dimethylethylenediamine, 30 parts of toluene, 25 parts of polypropylene particles, 3 parts of aromatic amine pigment, 5 parts of sodium polyacrylate, 3 parts of dibutyltin dilaurate, 4 parts of silicon dioxide, 2 parts of phosphoric acid type antioxidant, 3 parts of tributyl antimony oxide;

[0092] The isocyanate is a mixture of acrylic isocyanate and hexamethylene diisocyanate, and the weight ratio of the acrylic isocyanate to the hexamethylene diisocyanate is 1:9.

[0093] A one-component hand-coated polyurea material in this embodiment is prepared by the following method:

[0094] Step 2.1: Isocyanate, epoxy stearate, polytetrahydrofuranol, and N,N-dimethylethylenediamine were packed in different containers and then placed in a vacuum desiccator for drying and dehydration at a vacuum degree of 10 -2 mbar, drying temperature was 60°C, drying time was 5 h, and then cooled to 30°C;

[0095] Step 2.2: Preheat the reaction vessel to 50°C in a warm water bath. Gradually add the isocyanate to the reaction vessel, followed by the epoxy stearate, toluene, polypropylene particles, and aromatic amine pigment. Stir and maintain the temperature for 10 minutes at a stirring rate of 600 rpm.

[0096] Step 2.3: Heat the water bath to 80°C, slowly add polytetrahydrofuran alcohol during the heating process, and stir and mix for 10 minutes at a stirring rate of 600 rpm;

[0097] Step 2.4: Heat the water bath to 100°C. Slowly add N,N-dimethylethylenediamine during the heating process. Maintain the temperature and stir for 10 minutes at a stirring rate of 600 rpm.

[0098] In step 2.5, sodium polyacrylate, dibutyltin disilicate, silicon dioxide, a phosphoric acid antioxidant, and tributyl antimony oxide are added, the temperature is lowered to 85° C., and the mixture is stirred for reaction for 4 hours. The temperature is then lowered to 30° C. to obtain a one-component hand-scrape-coated polyurea material.

[0099] Example 7

[0100] A one-component hand-scraped polyurea material in this embodiment includes the following raw materials:

[0101] 60 parts of isocyanate, 15 parts of epoxy stearate, 70 parts of polytetramethylene glycol, 30 parts of N,N-dimethylethylenediamine, 35 parts of toluene, 35 parts of polypropylene particles, 4 parts of aromatic amine pigment, 8 parts of sodium polyacrylate, 8 parts of dibutyltin dilaurate, 5 parts of silicon dioxide, 3 parts of phosphoric acid type antioxidant, 4 parts of tributyl antimony oxide;

[0102] The isocyanate is a mixture of acrylic isocyanate and hexamethylene diisocyanate, and the weight ratio of the acrylic isocyanate to the hexamethylene diisocyanate is 1:3.

[0103] A one-component hand-coated polyurea material in this embodiment is prepared by the following method:

[0104] Step 2.1: Isocyanate, epoxy stearate, polytetrahydrofuranol, and N,N-dimethylethylenediamine were packed in different containers and then placed in a vacuum desiccator for drying and dehydration at a vacuum degree of 10 -2 mbar, drying temperature was 50°C, drying time was 3 h, and then cooled to 25°C;

[0105] Step 2.2: Preheat the reaction vessel to 50°C in a warm water bath. Gradually add the isocyanate to the reaction vessel, followed by the epoxy stearate, toluene, polypropylene particles, and aromatic amine pigment. Stir and maintain the temperature for 5 minutes at a stirring rate of 400 rpm.

[0106] Step 2.3: Heat the water bath to 70°C, slowly add polytetrahydrofuran alcohol during the heating process, and stir and mix for 5 minutes at a stirring rate of 400 rpm;

[0107] Step 2.4: Heat the water bath to 100°C. Slowly add N,N-dimethylethylenediamine while heating. Maintain the temperature and stir for 5 minutes at a stirring rate of 400 rpm.

[0108] In step 2.5, sodium polyacrylate, dibutyltin disilicate, silicon dioxide, a phosphoric acid antioxidant, and tributyl antimony oxide are added, the temperature is lowered to 75° C., and the mixture is stirred for reaction for 3 hours. The temperature is then lowered to 25° C. to obtain a one-component hand-scrape-coated polyurea material.

[0109] Example 8

[0110] A one-component hand-scraped polyurea material in this embodiment includes the following raw materials:

[0111] 60 parts of isocyanate, 15 parts of epoxy stearate, 70 parts of polytetramethylene glycol, 30 parts of N,N-dimethylethylenediamine, 35 parts of toluene, 35 parts of polypropylene particles, 4 parts of aromatic amine pigment, 8 parts of sodium polyacrylate, 8 parts of dibutyltin dilaurate, 5 parts of silicon dioxide, 3 parts of phosphoric acid type antioxidant, 4 parts of tributyl antimony oxide;

[0112] The isocyanate is a mixture of acrylic isocyanate and hexamethylene diisocyanate, and the weight ratio of the acrylic isocyanate to the hexamethylene diisocyanate is 1:5.

[0113] A one-component hand-coated polyurea material in this embodiment is prepared by the following method:

[0114] Step 2.1: Isocyanate, epoxy stearate, polytetrahydrofuranol, and N,N-dimethylethylenediamine were packed in different containers and then placed in a vacuum desiccator for drying and dehydration at a vacuum degree of 10 -2 mbar, drying temperature was 50°C, drying time was 3 h, and then cooled to 25°C;

[0115] Step 2.2: Preheat the reaction vessel to 50°C in a warm water bath. Gradually add the isocyanate to the reaction vessel, followed by the epoxy stearate, toluene, polypropylene particles, and aromatic amine pigment. Stir and maintain the temperature for 5 minutes at a stirring rate of 400 rpm.

[0116] Step 2.3: Heat the water bath to 70°C, slowly add polytetrahydrofuran alcohol during the heating process, and stir and mix for 5 minutes at a stirring rate of 400 rpm;

[0117] Step 2.4: Heat the water bath to 100°C. Slowly add N,N-dimethylethylenediamine while heating. Maintain the temperature and stir for 5 minutes at a stirring rate of 400 rpm.

[0118] In step 2.5, sodium polyacrylate, dibutyltin disilicate, silicon dioxide, a phosphoric acid antioxidant, and tributyl antimony oxide are added, the temperature is lowered to 75° C., and the mixture is stirred for reaction for 3 hours. The temperature is then lowered to 25° C. to obtain a one-component hand-scrape-coated polyurea material.

[0119] Example 9

[0120] A one-component hand-scraped polyurea material in this embodiment includes the following raw materials:

[0121] 60 parts of isocyanate, 15 parts of epoxy stearate, 70 parts of polytetramethylene glycol, 30 parts of N,N-dimethylethylenediamine, 35 parts of toluene, 35 parts of polypropylene particles, 4 parts of aromatic amine pigment, 8 parts of sodium polyacrylate, 8 parts of dibutyltin dilaurate, 5 parts of silicon dioxide, 3 parts of phosphoric acid type antioxidant, 4 parts of tributyl antimony oxide;

[0122] The isocyanate is a mixture of acrylic isocyanate and hexamethylene diisocyanate, and the weight ratio of the acrylic isocyanate to the hexamethylene diisocyanate is 1:9.

[0123] A one-component hand-coated polyurea material in this embodiment is prepared by the following method:

[0124] Step 2.1: Isocyanate, epoxy stearate, polytetrahydrofuranol, and N,N-dimethylethylenediamine were packed in different containers and then placed in a vacuum desiccator for drying and dehydration at a vacuum degree of 10 -2 mbar, drying temperature was 50°C, drying time was 3 h, and then cooled to 25°C;

[0125] Step 2.2: Preheat the reaction vessel to 50°C in a warm water bath. Gradually add the isocyanate to the reaction vessel, followed by the epoxy stearate, toluene, polypropylene particles, and aromatic amine pigment. Stir and maintain the temperature for 5 minutes at a stirring rate of 400 rpm.

[0126] Step 2.3: Heat the water bath to 70°C, slowly add polytetrahydrofuran alcohol during the heating process, and stir and mix for 5 minutes at a stirring rate of 400 rpm;

[0127] Step 2.4: Heat the water bath to 100°C. Slowly add N,N-dimethylethylenediamine while heating. Maintain the temperature and stir for 5 minutes at a stirring rate of 400 rpm.

[0128] In step 2.5, sodium polyacrylate, dibutyltin disilicate, silicon dioxide, a phosphoric acid antioxidant, and tributyl antimony oxide are added, the temperature is lowered to 75° C., and the mixture is stirred for reaction for 3 hours. The temperature is then lowered to 25° C. to obtain a one-component hand-scrape-coated polyurea material.

[0129] Example 10

[0130] Compared with Example 1, Example 10 replaces hexamethylene diisocyanate with an equal amount of methylene bisphenyl isocyanate, and the rest is the same as Example 1.

[0131] Comparative Example 1

[0132] Compared with Example 1, hexamethylene diisocyanate was not added in Comparative Example 1, and the other steps were the same as those in Example 1.

[0133] Comparative Example 2

[0134] Compared with Example 1, in Comparative Example 2, no acrylic isocyanate was added, and the other steps were the same as those in Example 1.

[0135] Test example

[0136] Some performance tests were conducted on the one-component hand-coated polyurea materials prepared in Examples 1-10 and Comparative Examples 1-2. The tensile strength, elongation at break, and tear strength of the polyurea materials were measured according to the test methods in GB / T 16777-2008 "Test Methods for Building Waterproof Coatings." The curing time was measured at a temperature of 25° C. and a humidity of 65%. The test results are shown in the following table:

[0137] Table 1 Performance test results of polyurea materials in Examples 1-10 and Comparative Examples 1-2

[0138]

[0139] As shown in the table, by comparing the performance data of Examples 1-3, Example 3 is superior to Examples 1 and 2 in all aspects, indicating that the best effect is achieved when the weight ratio of acrylic isocyanate to hexamethylene diisocyanate is 1:9. A comparison of the performance data of Example 1 and Example 10 shows that adding hexamethylene diisocyanate is more effective than adding methylene bisphenyl isocyanate. A comparison of Example 1 and Comparative Examples 1-2 shows that adding acrylic isocyanate and hexamethylene diisocyanate simultaneously achieves the best effect.

[0140] The one-component hand-scraped polyurea material prepared by the present invention has high tensile strength, elongation at break and tear strength. It not only has a wide range of applications but also has a moderate curing time. It does not generate bubbles and cracks due to a too short curing time, nor does it increase the process cycle and cost due to a too long curing time. It can also avoid the problem that the dried part is over-hardened, which makes subsequent processing and repair difficult.

[0141] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A one-component hand-scraped polyurea material, characterized in that: The invention is composed of the following raw materials: 15-60 parts of isocyanate, 3-15 parts of epoxy compound, 40-70 parts of polyether polyol, 5-30 parts of amine compound, 20-35 parts of solvent, 15-35 parts of filler, 1-4 parts of pigment, 3-8 parts of auxiliary agent, 1-5 parts of thickener, 1-3 parts of antioxidant and 1-4 parts of catalyst; Among them, the isocyanate is a mixture of isocyanate A and isocyanate B, and the weight ratio of isocyanate A to isocyanate B is 1:3~9; the isocyanate A is one or more of 1,4-cyclohexanedimethyl diisocyanate, methylenebisphenyl isocyanate, hexamethylene diisocyanate, and 3,3'-dichloro-4,4'-diisocyanate biphenyl; the isocyanate B is acrylic isocyanate.

2. The one-component manual scraping polyurea material according to claim 1, characterized in that: The polyether polyol is polytetrahydrofuran alcohol.

3. The one-component manual scraping polyurea material according to claim 1, characterized in that: The epoxy compound is epoxy resin or epoxy stearate.

4. The one-component manual scraping polyurea material according to claim 1, characterized in that: The amine compound is N,N-dimethylethylenediamine or N,N'-di(2-hydroxyethyl)ethylenediamine.

5. The one-component manual scraping polyurea material according to claim 1, characterized in that: The filler is one or more of polypropylene particles, polyethylene particles, glass microbeads, and ceramic microbeads.

6. The one-component manual scraping polyurea material according to claim 1, characterized in that: The mesh number of the filler is 150-500 meshes.

7. The one-component manual scraping polyurea material according to claim 1, characterized in that: The auxiliary agent consists of a dispersant and a stabilizer.

8. The one-component manual scraping polyurea material according to claim 1, characterized in that: The catalyst is one or more of dibutyl stannate, tri(diethylhexyl) lead oxide, and tributyl antimony oxide.

9. The method for preparing a one-component manual scraping polyurea material according to claim 1, characterized in that: The following steps are involved: Step 2.1: Isocyanate, epoxy compound, polyether polyol and amine compound are packed in different containers and then placed in a vacuum dryer for drying and dehydration at a vacuum degree of 10 -3 -10 -2 mbar, drying temperature is 25-60℃, drying time is 2h-5h, then cooled to 20-30℃; Step 2.2: Preheat the reaction vessel in a warm water bath to 25-50°C. Gradually add the isocyanate to the reaction vessel, followed by the epoxy compound, solvent, filler, and pigment. Stir and maintain the mixture at this temperature for 5-10 minutes at a stirring rate of 200-600 rpm. Step 2.3: Heat the water bath to 50-80°C, slowly add the polyether polyol during the heating process, and stir and mix for 5-10 minutes at a stirring rate of 200-600 rpm; Step 2.4: Heat the water bath to 80-100°C, slowly add the amine compound during the heating process, and stir and mix for 5-10 minutes at a stirring rate of 200-600 rpm; In step 2.5, an auxiliary agent, a thickener, an antioxidant, and a catalyst are added, the temperature is lowered to 65-85° C., the mixture is stirred and reacted for 2-4 hours, and then the temperature is lowered to 25-30° C. to obtain a single-component hand-scraped polyurea material.

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