Organosilicon-modified polyurea composition with excellent water resistance, weather resistance and compatibility, and preparation method and application thereof

Abstract

The present invention discloses a silicone-modified polyurea composition with excellent weather resistance and compatibility, and its preparation method and application. The composition is prepared from the following components in parts by weight: 25-75 parts of polyaspartate resin, 40-70 parts of polyisocyanate, 10-22 parts of dihydroxy acid, 13-44 parts of reactive amino silane, 13-26 parts of hydroxyacrylate, 0.2-0.3 parts of preservative, 5-22 parts of triethylamine, and 160-440 parts of deionized water. The aqueous composition prepared by the present invention has excellent performance characteristics of weather resistance, abrasion resistance, water resistance, and salt spray resistance, and improves the problems that the construction thickness of the aqueous polyurea coating in the market is relatively thin, and it is easy to form prickly heat and bubbles after construction. Since the aqueous composition of the present invention contains an acrylate structure and has good compatibility with water-dispersible aliphatic polyisocyanate, it has a suitable pot life after formulation, is convenient for construction, and has the advantage of a relatively thick one-time forming thickness.

Description

Technical Field

[0001] The present invention belongs to the technical field of coating preparation, and particularly relates to a preparation method and application of an organosilicon-modified polyurea composition with excellent water resistance, weather resistance and compatibility. Background Art

[0002] Aspartic polyurea resin is an elastomeric substance synthesized from amino compounds and isocyanates. It is constructed using special equipment, has a solid content of 100%, is solvent-free and pollution-free. It has the advantages of fast curing, good chemical corrosion resistance, high strength, strong anti-seepage, wear resistance and flexibility, and strong high and low temperature resistance. It has broad application prospects in anti-corrosion, waterproofing, wear-resistant and other projects. However, due to the too fast reaction rate between the primary amine in the amino compound and the short gel time, it is difficult to form a film and the adhesion of the aspartic polyurea resin film is poor. At present, by changing the amino compound to a secondary amine, the reaction rate with the isocyanate can be reduced. Nevertheless, during use, the viscosity changes greatly, and special spraying equipment is also required during construction, which is quite inconvenient to use.

[0003] Waterborne coatings have the advantages of low VOC, non-flammable, green, safe and environmentally friendly. However, in the two-component curing system of polyaspartate polyurea and water-dispersible curing agent isocyanate in the existing market, the reaction between the isocyanate and the amino group is often relatively fast, while the water evaporation rate is slow, which will result in poor adhesion, poor surface state, low coating thickness and poor mechanical properties. The mechanical properties, weather resistance, water resistance and resistance to media and other properties are out of the question. Organosilicon-modified polyurea in the market generally directly reacts the amino-terminated silane coupling agent with -NCO in the prepolymer or synthesizes the polyorganosiloxane terminated with secondary amino group by using the alkoxy group of the amino silane coupling agent and the hydroxyl group of the organic silicon. The reaction process is long, complex and uncontrollable.

[0004] The current reaction process between waterborne polyurea and isocyanate and its pot life are uncontrollable. Moreover, there are problems such as short operation time, difficult leveling and inconvenient construction caused by the need to use special equipment for coating. The coating is prone to prickly heat and blistering. Summary of the Invention

[0005] Object of the Invention: Aiming at the above problems, the present invention innovates the way of preparing polyurea prepolymers and prepares a silicone-modified polyurea composition with excellent water resistance, weather resistance and compatibility by using a method of end-capping with self-made active aminoalkoxysilane. The composition of the present invention changes the end-capping of the polyurea composition from secondary amino group to hydroxyl group. In addition to having excellent properties of weather resistance, abrasion resistance, water resistance and salt spray resistance, it solves the problems that the construction thickness of the waterborne polyurea coating in the market is relatively thin and it is easy to form prickly heat and bubbles after construction. The waterborne composition of the present invention contains acrylate structure and has good compatibility with water-dispersible aliphatic polyisocyanate. After formulation, it has a suitable pot life, is convenient for construction, and has the advantage of a relatively thick one-time forming thickness.

[0006] Another technical problem to be solved by the present invention is to provide a preparation method and application of a novel silicone-modified polyurea composition with excellent water resistance, weather resistance and compatibility.

[0007] Technical Solution: To solve the above technical problems, the present invention provides a silicone-modified polyurea composition with excellent water resistance, weather resistance and compatibility. The composition is prepared from the following components by weight: 25-75 parts of polyaspartate resin, 40-70 parts of polyisocyanate, 10-22 parts of dihydroxy acid, 10-46 parts of active amino silane, 5-30 parts of hydroxyacrylate, 0.2-0.3 part of preservative, 5-22 parts of triethylamine and 160-440 parts of deionized water.

[0008] Among them, the polyaspartate resin includes polyaspartate resin with terminal bis-secondary amino groups and resins with similar structures, and the molecular weight is 400-2000.

[0009] Among them, the polyisocyanate includes alicyclic diisocyanate, HDI trimer, IPDI trimer or a mixture of any several of them.

[0010] Among them, the active amino silane is an active amino organosiloxane containing hydroxyl group and secondary amino group prepared by Michael addition reaction of primary aminoalkoxysilane and hydroxyacrylate.

[0011] Among them, the hydroxyacrylate is one or several of hydroxypropyl acrylate, hydroxypropyl methacrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate.

[0012] Among them, the dihydroxy acid includes one or both of dihydroxypropionic acid and dihydroxybutyric acid.

[0013] Among them, the preservative includes one or a mixture of any several of isothiazolinone-based, sodium dehydroacetate, benzisothiazolinone-based or guanidine triazine-based preservatives.

[0014] The present invention also includes a preparation method of the organosilicon-modified polyurea composition, comprising the following steps:

[0015] 1) Heat the polyaspartic ester resin and the polyisocyanate to 70 - 80 °C and react for 2 - 4 hours to obtain a polyurea prepolymer;

[0016] 2) Cool down to 40 - 50 °C, add the dihydroxy acid, heat up to 70 - 80 °C and react for 2 - 4 hours to obtain an extended isocyanate prepolymer;

[0017] 3) Put the active amino silane into the extended isocyanate prepolymer, heat up to 70 - 80 °C and react for 2 - 4 hours to complete capping and obtain a silane-modified polyurea oligomer;

[0018] 4) Cool down to 50 - 60 °C, add triethylamine, keep it at 50 - 60 °C for 2 hours, then add deionized water, stir and emulsify, then add the preservative and stir evenly, and stir and keep it warm at 70 ± 2 °C for 2 hours to obtain.

[0019] Among them, the preparation method of the active amino silane in step 3) comprises the following steps: Take the amino siloxane and the hydroxyacrylate, put them into a reactor protected by nitrogen, gradually heat up to 70 - 80 °C and keep the temperature for 6 - 8 hours to obtain the active amino siloxane.

[0020] The present invention also includes the application of the organosilicon-modified polyurea composition in the preparation of building profile coatings, high-strength glass fiber composite coatings, inks, textile sizing agents or other high-performance waterborne coatings.

[0021] The present invention utilizes the Michael addition principle to synthesize a hydroxyl-containing active secondary amino siloxane from a hydroxyacrylate monomer and an amino silane. The reaction is simple and controllable. Then, the secondary amino group reacts with the isocyanate to prepare an organosilicon-modified polyurea composition with excellent waterborne weather resistance and compatibility, which not only has the excellent weather resistance, water resistance, ultra-low surface performance and good adhesion of organosilicon, but also has a suitable reaction rate between the hydroxyl aqueous dispersion and the isocyanate, has good operability and relatively stable construction viscosity, is convenient for construction, and demonstrates the excellent weather resistance, wear resistance, water resistance and salt spray resistance of solvent-based polyurea. Specifically, in this preparation system, first, the waterborne composition contains a polyaspartic ester resin with good compatibility and can be used in combination with a water-dispersible aliphatic polyisocyanate as a two-component curing system, which can not only be cured at room temperature but also has a suitable working time; second, the modified organosilane oxygen group can be hydrolyzed in water to form silanol groups, and the condensation of silanol groups has the characteristic of double curing; third, the composition system contains Si - O - Si with relatively high bond energy and has good weather resistance; therefore, the modified waterborne composition of the present invention has more excellent performance, and the formed coating has excellent mechanical properties, excellent weather resistance, wear resistance and chemical medium resistance.

[0022] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0023] 1. The aqueous composition prepared by the present invention not only has the advantages of safety, environmental protection and stability, but also has excellent performance characteristics of solvent-based polyurea such as weather resistance, abrasion resistance, water resistance and salt spray resistance. By converting the terminal amino group of the molecular chain into a hydroxyl group, not only the disadvantages of short operation time, difficult leveling and inconvenient construction of solvent-based polyurea are improved, but also the problems of thin construction thickness of aqueous polyurea coatings on the market, and easy appearance of prickly heat and blisters after construction are improved. Since the aqueous composition of the present invention contains an acrylate structure and has good compatibility with water-dispersible aliphatic polyisocyanates, it has a suitable pot life after formulation, is convenient for construction, has the advantage of a relatively thick one-time forming thickness, and the formed coating has good leveling property, high gloss, excellent weather resistance and excellent mechanical properties. Due to the inclusion of organosilicon components, the adhesion, weather resistance, water resistance and chemical resistance of the coating will be further improved.

[0024] 2. The aqueous dispersion system of the composition of the present invention has high stability, excellent adhesion to the substrate, weather resistance, abrasion resistance, water resistance, good compatibility and stability with pigments and dyes, excellent water resistance, and extremely low VOC (volatile organic compounds) and HAP (hazardous air pollutants) values, and has a relatively low viscosity, which has a better application prospect for the preparation and development of high-performance aqueous coatings, inks, textile sizing agents, etc. such as coatings for new building profiles such as wind turbine blade coatings and new high-strength glass fiber composite coatings. Specific embodiments

[0025] The present invention will be further specifically described below in conjunction with embodiments, but is not limited thereto. Unless otherwise specified, the quantities in the embodiments are in parts by weight, and the specifications of the raw materials used are commercially available industrial products unless otherwise stated.

[0026] Example 1

[0027] 1. Preparation of active amino silicone

[0028] Take 44.0 g of aminopropyltrimethoxysilane and 26.0 g of hydroxypropyl acrylate, put them into a reactor protected by nitrogen, gradually heat up to 80 °C, and keep the temperature for 6 hours to obtain 70.0 g of self-made active amino silicone.

[0029] 2. Preparation of organosilicon-modified polyurea composition with excellent weather resistance and compatibility

[0030] 1) Take 45.0 g of HDI diisocyanate and 55.0 g of F420 polyaspartate resin (Shenzhen Feiyang Junyan New Materials Co., Ltd.) and put them into a reactor, protect with nitrogen, heat up to 70 °C, and react for 3 hours.

[0031] 2) Cool down to 60 °C, add 11.0 g of dimethylolbutyric acid, protect with nitrogen, heat up to 80 °C, and react for 4 hours to obtain the chain-extended isocyanate prepolymer.

[0032] 3) Cool down to 60 °C, add 70.0 g of reactive amino silicone oil and 13.0 g of triethylamine by weight, continue to protect with nitrogen, heat up to 70 °C, and react for 3 hours.

[0033] 4) Gradually add 280.2 g of deionized water for emulsification at a stirring speed of 300 - 500 rpm, finally add 0.3 g of isothiazolinone fungicide (2-methyl-4-isothiazolin-3-one), keep stirring at 70 °C for 2 hours, then cool down to below 45 °C, filter and package to obtain the aqueous composition of the present invention.

[0034] This Example 1 is the optimal solution.

[0035] Example 2

[0036] 1. Preparation of reactive amino silicone oil

[0037] Take 30.0 g of aminotrimethoxysilane, 10.0 g of hydroxyethyl acrylate, and 7.0 g of hydroxypropyl acrylate, put them into a reactor protected by nitrogen, gradually heat up to 70 °C, and keep reacting for 8 hours to obtain 47.0 g of self-made reactive amino silicone oil.

[0038] 2. Preparation of organosilicon-modified polyurea composition with excellent water resistance, weather resistance and compatibility

[0039] 1) Take 70.0 g of IPDI diisocyanate, 45.0 g of F420, and 5.0 g of F524 polyaspartic ester resin (Shenzhen Feiyang Junyan New Materials Co., Ltd.), put them into a reactor, protect with nitrogen, heat up to 60 °C, and react for 5 hours.

[0040] 2) Cool down to 50 °C, add 10.0 g of dimethylolbutyric acid and 3.0 g of dimethylolpropionic acid, protect with nitrogen, heat up to 70 °C, and react for 4 hours to obtain the chain-extended isocyanate prepolymer.

[0041] 3) Cool down to 60 °C, add 47.0 g of self-made reactive amino silicone oil and 13.0 g of triethylamine by weight, continue to protect with nitrogen, heat up to 70 °C, and react for 3 hours.

[0042] 4) Gradually add 290.0 g of deionized water for emulsification at a stirring speed of 300 - 500 rpm, finally add 0.3 g of isothiazolinone fungicide (2-methyl-4-isothiazolin-3-one), keep stirring at 60 °C for 2 hours, then cool down to below 45 °C, filter and package to obtain the aqueous composition of the present invention.

[0043] Example 3

[0044] 1. Preparation of active amino silicone

[0045] Take 30.0 g of amino triethoxysiloxane, 8.0 g of hydroxyethyl acrylate and 10.0 g of hydroxybutyl acrylate, put them into a reactor protected by nitrogen, gradually heat up to 70 °C, and keep the temperature for 8 hours to obtain 48.0 g of self-made active amino silicone

[0046] 2. Preparation of silicone-modified polyurea composition with excellent waterborne weather resistance and compatibility

[0047] 1) Take 60.0 g of HDI diisocyanate and 55.0 g of F420 polyaspartate resin and put them into a reactor, protect it with nitrogen, heat up to 65 °C, and react for 4 hours

[0048] 2) Cool down to 55 °C, add 16.0 g of dimethylolpropionic acid, protect it with nitrogen, heat up to 75 °C, and react for 4 hours to obtain an extended isocyanate prepolymer

[0049] 3) Cool down to 60 °C, add 48.0 g of self-made active amino silicone and 13.0 g of triethylamine by weight, continue to protect it with nitrogen, heat up to 70 °C, and react for 3 hours

[0050] 4) Gradually add 290.2 g of deionized water for emulsification at a stirring speed of 300 - 500 rpm, finally add 0.2 g of benzisothiazolinone fungicide (N-n-butyl-1,2-benzisothiazolin-3-one), keep stirring at 65 °C for 2 hours, then cool down to below 45 °C, filter and package to obtain the waterborne composition of the present invention

[0051] Example 4

[0052] 1. Preparation of active amino silicone

[0053] Take 30.0 g of amino triethoxysilane and 18.0 g of hydroxypropyl acrylate, put them into a reactor protected by nitrogen, gradually heat up to 75 °C, and keep the temperature for 7 hours to obtain 48.0 g of self-made active amino silicone

[0054] 2. Preparation of silicone-modified polyurea composition with excellent waterborne weather resistance and compatibility

[0055] 1) Take 48 g of HDI diisocyanate, 22 g of IPDI diisocyanate and 55.0 g of F420 polyaspartate resin and put them into a reactor, protect it with nitrogen, heat up to 65 °C, and react for 4 hours

[0056] 2) Cool down to 50 °C, add 16.0 g of dimethylolbutyric acid, protect with nitrogen, heat up to 75 °C, and react for 4 hours to obtain the chain-extended isocyanate prepolymer.

[0057] 3) Cool down to 60 °C, add 48.0 g of self-made active amino silicone oil and 13.0 g of triethylamine by weight, continue to protect with nitrogen, heat up to 70 °C, and react for 3 hours.

[0058] 4) Gradually add 290.2 g of deionized water for emulsification at a stirring speed of 300 - 500 rpm, finally add 0.2 g of isothiazolinone fungicide (2-methyl-4-isothiazolin-3-one), keep stirring at 70 °C for 2 hours, then cool down to below 45 °C, filter and package to obtain the aqueous composition of the present invention.

[0059] Comparative Example 1

[0060] Case of preparing an organosilicon-modified polyurea composition with excellent water resistance and weather resistance and compatibility by using aminotriethoxysilane instead of active amino silicone oil:

[0061] 1) Put 45.0 g of HDI diisocyanate and 55.0 g of F420 polyaspartate resin into a reactor, protect with nitrogen, heat up to 70 °C, and react for 3 hours.

[0062] 2) Cool down to 60 °C, add 11.0 g of dimethylolbutyric acid, protect with nitrogen, heat up to 80 °C, and react for 4 hours to obtain the chain-extended isocyanate prepolymer.

[0063] 3) Cool down to 60 °C, add 44.0 g of aminopropyltrimethoxysilane and 13.0 g of triethylamine by weight, continue to protect with nitrogen, heat up to 70 °C, and react for 3 hours.

[0064] 4) Gradually add 250.2 g of deionized water for emulsification at a stirring speed of 300 - 500 rpm, finally add 0.3 g of isothiazolinone fungicide (2-methyl-4-isothiazolin-3-one), keep stirring at 70 °C for 2 hours, then cool down to below 45 °C, filter and package to obtain the aqueous composition of the present invention.

[0065] Among them, after adding aminopropyltrimethoxysilane and triethylamine in step 3), the reaction is relatively violent, and the viscosity increases more compared with other cases. To reduce the climbing of the reactants on the rod, the stirring speed is reduced during the operation, and there are a few colloidal particles in the obtained product emulsion.

[0066] The comparison of relevant parameters of the products prepared in Examples 1 - 4 of the present invention and the product prepared in Comparative Example 1 is shown in Table 1.

[0067] Table 1

[0068]

[0069]

[0070] Note: The molecular chain end of Comparative Example 1 is a secondary amino group, and the data in the column are converted into hydroxyl values.

[0071] Experimental Example 1: Preparation of varnish and its performance test

[0072] The above-mentioned water-based silicone-modified polyurea composition with excellent weather resistance and compatibility is used in combination with a water-dispersible polyisocyanate curing agent. When the n(-NCO) / n(-OH) equivalent ratio is 1.1, the varnish formula is as shown in Table 2:

[0073] Table 2

[0074]

[0075] Note: The curing agent preparation and process are shown in Table 3.

[0076] Operation process: According to the proportion in Table 2, add the emulsion (the composition prepared in Examples 1-4 and Comparative Example 1) into a container, and add deionized water during stirring. Add wetting agent, defoamer, leveling agent and anti-flash agent in sequence at a speed of 300-400r / min. Finally, adjust the viscosity and pH value to 7.5-8.5 with deionized water, thickener and dimethylethanolamine, and continue stirring for 20 minutes. Finally, filter with a 200-mesh filter and set aside. Prepare the prepared varnish according to the proportion in Table 2, mix and stir evenly, let it stand for about 15 minutes, and spray it on the polished tinplate. After the paint film is dry, perform mechanical properties and salt water resistance tests. The curing agent formula in Table 2 is shown in Table 3:

[0077] Table 3

[0078]

[0079] Operation process: dilute the water-dispersible polyisocyanate AQUAPU-298 curing agent with urethane-grade propylene glycol methyl ether acetate for later use.

[0080] The test results of the varnish properties prepared by Examples 1-4 and Comparative Example 1 are shown in Table 4:

[0081] Table 4

[0082]

[0083]

[0084] Note: The viscosity of the varnishes in Examples 1 to 4 increased slightly 3 hours after preparation, showing better performance, while the paint in Comparative Example 1 thickened quickly during preparation and was completely unusable after half an hour.

[0085] The preliminary performance test results of the varnishes further prepared from the compositions prepared in Examples 1-4 and Comparative Example 1 were compared. It can be seen that: From the mechanical properties and medium resistance data, it can be seen that the performance of Example 1 is relatively excellent. The hydroxyl value of Examples 2 to 4 is too small, resulting in a low crosslinking density, which causes the performance of the paint film in terms of hardness, water resistance, salt water resistance, abrasion resistance, and impact strength to be inferior to that of Example 1. In terms of the pot life after the paint is prepared, the performance of the comparative example is extremely unsatisfactory. The reason is that the reaction between the waterborne resin and the polyurethane curing agent in the composition of the example is between the hydroxyl group and the isocyanate, and the reaction process is relatively mild. However, the reaction groups in Comparative Example 1 are between the secondary amine and the isocyanate, and the reaction is relatively rapid, the viscosity increases rapidly, which is not conducive to leveling. Therefore, in addition to the short pot life, the gloss of Comparative Example 1 is also low. The water resistance and salt water resistance of Comparative Example 1 are poor because during the synthesis of Comparative Example 1, the reaction is violent, there is reaction competition, and the product resin molecules are uneven, resulting in poor performance.

[0086] Preparation and Performance Testing of Waterborne Color Paint Slurry in Experimental Example 2

[0087] The basic formula of the waterborne color paint is shown in Table 5.

[0088] Table 5

[0089]

[0090]

[0091] Operating process: According to the mass percentages in Table 5, 1 was added to the container respectively, and deionized water was added during stirring. 2 and 3 were added successively at a rotation speed of 400 r / min. After stirring evenly, 4, 5, and 7 were added. After dispersing evenly, 8 was added. Finally, 6, 9, and 10 were added to adjust the viscosity and pH value to 7.5-8.5, and stirring was continued for 20 min. Finally, it was filtered through a 200-mesh filter screen and packaged.

[0092] The sources of some raw materials used in this experimental example are as follows: Carbon black paste: TSE LR01 carbon black paste, Shiming Technology Co., Ltd., Suzhou; Titanium white paste: 3087 titanium white paste, Shiming Technology Co., Ltd., Suzhou; Levelling agent: Tego100, Degussa AG, Germany; Wetting agent: Tego270, Degussa AG, Germany; Defoaming agent: Tego901w, Degussa AG, Germany; Thickening agent: LD7061, Yangzhou Lida Resin Co., Ltd.; Anti-corrosion agent 189: Guangzhou Hangyu High-Tech New Technology Co., Ltd.

[0093] Usage method: Mix the waterborne color paint components and the curing agent according to the ratio and stir evenly, and let it stand for about 15 min for use. The curing agent formula and process are the same as those described in Table 3 above.

[0094] The preparation process for testing the performance of the paint film is as follows: Spray on the surface-treated tinplate, and after the wet film has surface-dried, place it in an oven at 80 °C and bake for 40 min to obtain the finished paint film. Test flexibility, adhesion, pencil hardness, abrasion resistance, and alcohol resistance wiping test.

[0095] For the performance test of the paint film further prepared using the products of Examples 1-4 and Comparative Example 1, see Table 6.

[0096] Table 6

[0097]

[0098]

[0099] Experimental Example 3: Scarlet Paint Coating Dry Film Thickness Experiment and Its Performance Test

[0100] When the organosilicon-modified polyurea composition with excellent weather resistance and compatibility prepared in Examples 1-4 and Comparative Example 1 is used in combination with a water-dispersible polyisocyanate curing agent, the clear varnish formula when the n(-NCO) / n(-OH) equivalent ratio is 1.1 is shown in Table 7:

[0101] Table 7

[0102]

[0103]

[0104] Operating process: According to the mass percentages in Table 7, add 1 to the container respectively, and add deionized water during stirring. Add 2 and 3 in sequence at a rotation speed of 400 r / min, after stirring evenly, add 4, 5, and 7, after dispersing evenly, add 8, and finally add 6, 9, and 10 to adjust the viscosity and pH value to 7.5 - 8.5, and continue stirring for 20 min. Finally, filter with a 200-mesh filter screen and package.

[0105] The sources of some raw materials used in this experimental example are as follows: Weather-resistant scarlet paste: SIP water-based paint special color paste 3071 DPP scarlet paste, Suzhou Shiming Technology Co., Ltd.; titanium white paste: 3087 titanium white paste, Suzhou Shiming Technology Co., Ltd.; leveling agent: Tego100, Degussa GmbH, Germany; wetting agent: Tego270, Degussa GmbH, Germany; defoaming agent: Tego901w, Degussa GmbH, Germany; thickening agent: LD7061, Yangzhou Lida Resin Co., Ltd.; corrosion inhibitor 189: Guangzhou Hangyu Hi-Tech Co., Ltd.

[0106] Usage method: Mix the water-based color paint component and the curing agent according to the ratio and stir evenly, and let it stand for about 15 min for use. The curing agent formula and process are the same as those described in Table 3 above.

[0107] The preparation process for testing the performance of the paint film is as follows: Spray on the surface-treated tinplate, and after the wet film surface dries, place it in an oven at 80 °C and bake for 40 minutes to obtain the finished paint film. Test the apparent state of different coating thicknesses.

[0108] The summary of the appearance states of the paint films further prepared using the products of Examples 1-4 and Comparative Example 1 is shown in Table 8.

[0109] Table 8

[0110]

Claims

1. An organosilicon-modified polyurea composition with excellent water resistance, weather resistance and compatibility, characterized in that, The composition is prepared from the following components by weight: 25-75 parts of polyaspartate resin, 40-70 parts of polyisocyanate, 10-22 parts of dihydroxy acid, 13-44 parts of active amino silane, 13-26 parts of hydroxy acrylate, 0.2-0.3 parts of preservative, 5-22 parts of triethylamine, and 160-440 parts of deionized water. The polyaspartate resin includes a polyaspartate resin with terminal bis-secondary amino groups, having a molecular weight of 400-2000. The polyisocyanate includes an alicyclic diisocyanate, an HDI trimer, an IPDI trimer, or a mixture of any several of them. The active amino silane is an active amino organosiloxane containing hydroxyl and secondary amino groups prepared by Michael addition reaction of a primary amino alkoxysilane and a hydroxy acrylate. The hydroxy acrylate is one or several of hydroxypropyl acrylate, hydroxypropyl methacrylate, hydroxyethyl acrylate, and hydroxyethyl methacrylate. The dihydroxy acid includes one or both of dihydroxypropionic acid and dihydroxybutyric acid. The preservative includes one or a mixture of any several of isothiazolinone-based, sodium dehydroacetate, benzisothiazolinone-based, or guanidine triazine-based preservatives. The preparation method of the organosilicon-modified polyurea composition includes the following steps: 1) Take the polyaspartate resin and polyisocyanate and heat them to 70-80 °C, and react for 2-4 hours to obtain a polyurea prepolymer; 2) Cool down to 40-50 °C, add the dihydroxy acid, heat up to 70-80 °C, and react for 2-4 hours to obtain an extended isocyanate prepolymer; 3) Put the active amino silane into the extended isocyanate prepolymer, heat up to 70-80 °C, and react for 2-4 hours to complete capping to obtain a silane-modified polyurea oligomer; 4) Cool down to 50-60 °C, add triethylamine, and add deionized water while maintaining the temperature at 50-60 °C, stir and emulsify, then add the preservative and stir evenly, and stir and keep warm at 70 ± 2 °C to prepare.

2. The preparation method of the silicone-modified polyurea composition according to claim 1, characterized in that, Including the following steps: 1) Take the polyaspartate resin and polyisocyanate and heat them to 70-80 °C, and react for 2-4 hours to obtain a polyurea prepolymer; 2) Cool down to 40-50 °C, add the dihydroxy acid, heat up to 70-80 °C, and react for 2-4 hours to obtain an extended isocyanate prepolymer; 3) Put the active amino silane into the extended isocyanate prepolymer, heat up to 70-80 °C, and react for 2-4 hours to complete capping to obtain a silane-modified polyurea oligomer; 4) Cool down to 50-60 °C, add triethylamine, and add deionized water while maintaining the temperature at 50-60 °C, stir and emulsify, then add the preservative and stir evenly, and stir and keep warm at 70 ± 2 °C to prepare.

3. The preparation method of the silicone-modified polyurea composition according to claim 2, characterized in that, The preparation method of the active amino silane in step 3) includes the following steps: Take the amino siloxane and hydroxy acrylate, put them into a reactor protected by nitrogen, gradually heat up to 70-80 °C, and keep warm and react for 6-8 hours to obtain the active amino silane.

4. Use of the organosilicon-modified polyurea composition according to claim 1 in the preparation of building profile coatings, high-strength glass fiber composite coatings, inks, textile sizing agents, or waterborne coatings.

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