Transparent waterproofing paste for exterior wall and preparation method thereof

Abstract

The application discloses an outer wall transparent waterproof paste and a preparation method thereof, and relates to the technical field of waterproof materials. The outer wall transparent waterproof paste comprises the following raw material components in proportion by weight: 35-45 parts of a composite prepolymer, 30-45 parts of a composite curing agent, 0.02-0.06 parts of a penetrating agent, 0.6-1.2 parts of a thickening agent, 0.1-0.3 parts of a defoaming agent and 26-30 parts of water. The composite prepolymer is obtained by mixing and pre-polymerizing triethanolamine, polyester polyol and isocyanate trimer. The composite curing agent is obtained by mixing and reacting polyester polyol, 4-aminobenzoyl chloride, 4-hydroxy-2-methylbenzenesulfonic acid ammonium, chlorinated paraffin, transparent talc powder, 600-mesh mica powder, anhydrous aluminum chloride, plasticizer DOP, catalyst dibutyltin dilaurate and defoaming agent.

Description

TECHNICAL FIELD

[0001] The present application relates to waterproof material technical field, specifically to a kind of transparent waterproof paste for outer wall and preparation method thereof. BACKGROUND

[0002] Waterproof material is various, and can be divided into four categories: waterproofing membrane, waterproof coating, sealant, rigid waterproofing material, etc.

[0003] With the diversification of modern architectural design, the improvement of people's aesthetic consciousness and the higher pursuit of building appearance, the existing waterproof material cannot meet the selection of people, especially for the waterproof of building outer wall (periphery), the existing transparent waterproof paste for outer wall is prepared from special copolymer emulsion as base, synthetic rubber emulsion modifier, surfactant, plasticizer and other refined high-molecular flexible transparent colorless outer wall transparent waterproof paste, which is used for outer wall waterproofing and has poor mechanical properties and ultraviolet resistance. Therefore, the present application provides a kind of transparent waterproof paste for outer wall to solve these problems. SUMMARY

[0004] To solve the problems in the prior art, the present application provides a kind of transparent waterproof paste for outer wall, which comprises the following raw material components by weight fraction: 35-45 parts of composite prepolymer, 30-45 parts of composite curing agent, 0.02-0.06 parts of penetrating agent, 0.6-1.2 parts of thickening agent, 0.1-0.3 parts of defoaming agent, 26-30 parts of water.

[0005] Further, the penetrating agent uses water-soluble fluorine surfactant.

[0006] Further, the thickening agent uses alkali-swellable acrylate thickening agent.

[0007] Further, the defoaming agent uses silicone defoaming agent.

[0008] Further, the composite prepolymer is obtained by mixing pre-polymerization of triethanolamine, polyester polyol and isocyanate trimer.

[0009] Further, the composite curing agent is obtained by mixing reaction of polyester polyol, 4-aminobenzoyl chloride, 4-hydroxy-2-methylbenzenesulfonic acid ammonium, chlorinated paraffin, transparent talc powder, 600 mesh mica powder, anhydrous aluminum chloride, plasticizer DOP, catalyst dibutyltin dilaurate and defoaming agent.

[0010] The present application also provides a kind of preparation method of transparent waterproof paste for outer wall, comprising the following preparation steps:

[0011] Mix 35-45 parts by mass of the composite prepolymer and 30-45 parts by mass of the composite curing agent, stir until uniform at 300-500 rpm, then add 0.02-0.06 parts by mass of the penetrating agent, 0.6-1.2 parts by mass of the thickening agent, 0.1-0.3 parts by mass of the defoaming agent, and 26-30 parts by mass of water in sequence, continue stirring for 5-8 min to obtain the transparent waterproof paste for exterior wall.

[0012] Further, the preparation method of the composite prepolymer comprises the following steps: mixing triethanolamine and polyol according to a mass ratio of 0.06-0.12:1, stirring uniformly at 500-700 rpm and heating to 115-125℃, then dehydrating at a reduced pressure of-0.09 MPa for 55-65 min, then cooling to 70-80℃, then adding isocyanate trimer with a mass of 8-12 times of the polyester polyol, heating to 80-90℃, and reacting for 2-3 h to obtain the composite prepolymer.

[0013] Further, the preparation steps of the composite curing agent comprise the following steps: mixing polyol, 4-aminobenzoyl chloride, 4-hydroxy-2-methylbenzenesulfonic acid ammonium, chlorinated paraffin, transparent talc powder, 600-mesh mica powder, and anhydrous aluminum chloride according to a mass ratio of 1:0.2-0.6:0.4-0.8:0.10:0.25:0.12-0.14:0.06-0.08, stirring and mixing at 500-700 rpm, heating to 60-70℃ and stirring for 2.5-3.5 h, then continuously heating to 105-115℃, dehydrating at a reduced pressure of-0.09 MPa for 55-65 min, then cooling to 70-80℃, adding plasticizer DOP with a mass of 0.15-0.25 times of the polyester polyol, catalyst dibutyltin dilaurate with a mass of 0.02-0.04 times of the polyester polyol, and defoaming agent with a mass of 0.03-0.05 times of the polyester polyol, stirring for 30 min, then cooling and discharging to obtain the composite curing agent.

[0014] Further, the polyester polyol is L3025 polyester polyol from Shanghai Shunrong Chemical Co., Ltd.

[0015] Compared with the prior art, the present application has the following beneficial effects:

[0016] The transparent waterproof paste for exterior wall of the present application comprises the following raw material components: composite prepolymer, composite curing agent, penetrating agent, thickening agent, defoaming agent, and water; the composite prepolymer is obtained by mixing triethanolamine, polyester polyol, and isocyanate trimer; and the composite curing agent is obtained by mixing polyester polyol, 4-aminobenzoyl chloride, 4-hydroxy-2-methylbenzenesulfonic acid ammonium, chlorinated paraffin, transparent talc powder, 600-mesh mica powder, anhydrous aluminum chloride, plasticizer DOP, catalyst dibutyltin dilaurate, and defoaming agent.

[0017] The composite prepolymer is obtained by mixing triethanolamine, polyester polyol and isocyanate trimer to prepare a prepolymer, the isocyanate groups in the isocyanate trimer react with the hydroxyl groups in the triethanolamine and polyester polyol to obtain a hyperbranched polyurethane prepolymer network; then, the polyester polyol, 4-aminobenzoyl chloride, 4-hydroxy-2-methylbenzenesulfonic acid ammonium, chlorinated paraffin, transparent talc powder, 600-mesh mica powder, anhydrous aluminum chloride, plasticizer DOP, catalyst dibutyltin dilaurate and defoaming agent are mixed to obtain a composite curing agent, the polyester polyol, 4-aminobenzoyl chloride and 4-hydroxy-2-methylbenzenesulfonic acid ammonium penetrate into the hyperbranched polyurethane prepolymer network and react with the isocyanate in the hyperbranched polyurethane prepolymer network to form a poly-crosslinked hyperbranched structure polyurethane three-dimensional network, the 4-hydroxy-2-methylbenzenesulfonic acid is inserted between the layers of the mica powder to uniformly disperse the mica powder in the composite curing agent, meanwhile, the 4-aminobenzoyl chloride is grafted to the ortho position of the hydroxyl group on the benzene ring of the 4-hydroxy-2-methylbenzenesulfonic acid to form a benzophenone derivative, which enhances the anti-UV aging performance of the transparent waterproof paste for exterior walls, the transparent talc powder and 600-mesh mica powder quickly enter the cavities of the polyurethane three-dimensional network and are stably grafted in the polyurethane three-dimensional network through the reaction of the hydroxyl groups and the amino groups with the polyurethane, when the transparent waterproof paste for exterior walls is applied to the surface of the exterior wall, a micro-nano structure coating is formed, which enhances the mechanical properties and waterproof performance of the transparent waterproof paste for exterior walls. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0019] In order to more clearly illustrate the method provided by the present application, the following embodiments are described in detail. The test methods of various indexes of the transparent waterproof paste for exterior walls prepared in the following embodiments are as follows:

[0020] Waterproofness, mechanical properties and anti-UV aging performance: the transparent waterproof pastes for exterior walls prepared in the same quality of the embodiments and the comparative examples are taken to test the waterproofness, mechanical properties and anti-UV aging performance according to GB / T16777.

[0021] Embodiment 1

[0022] A preparation method of a transparent waterproof paste for exterior walls, comprising the following preparation steps:

[0023] Mix 35 parts by mass of the composite prepolymer and 30 parts by mass of the composite curing agent, stir at 300 rpm until uniform, then sequentially add 0.02 parts by mass of the penetrating agent, 0.6 parts by mass of the thickening agent, 0.1 parts by mass of the defoaming agent, and 26 parts by mass of water, continue stirring for 5 min to obtain the transparent waterproof paste for exterior walls;

[0024] The preparation steps of the composite prepolymer include:

[0025] Mix triethanolamine and polyester polyol at a mass ratio of 0.06:1, stir at 500 rpm until uniform and heat to 115°C, then dehydrate at -0.09 MPa for 55 min, then cool to 70°C, then add MDI trimer at 8 times the mass of the polyester polyol, heat to 80°C, and react for 2 h to obtain the composite prepolymer;

[0026] The preparation steps of the composite curing agent include:

[0027] Mix polyester polyol, 4-aminobenzoyl chloride, 4-hydroxy-2-methylbenzenesulfonic acid ammonium, chlorinated paraffin, transparent talc, 600-mesh mica powder, and anhydrous aluminum chloride at a mass ratio of 1:0.2:0.4:0.10:0.25:0.12:0.06, stir at 500 rpm and heat to 60°C for 2.5 h, then continue heating to 105°C, dehydrate at -0.09 MPa for 55 min, then cool to 70°C, add plasticizer DOP at 0.15 times the mass of the polyester polyol, catalyst dibutyltin dilaurate at 0.02 times the mass of the polyester polyol, and defoaming agent at 0.03 times the mass of the polyester polyol, stir for 30 min, then cool and discharge to obtain the composite curing agent;

[0028] The polyester polyol is L3025 polyester polyol from Shanghai Shunrong Chemical Co., Ltd.; the penetrating agent is a water-soluble fluorine surfactant; the thickening agent is an alkali-swellable acrylate thickening agent; and the defoaming agent is an organic silicon-based defoaming agent.

[0029] Example 2

[0030] A method for preparing a transparent waterproof paste for exterior walls includes the following preparation steps:

[0031] Mix 40 parts by mass of the composite prepolymer and 35 parts by mass of the composite curing agent, stir at 400 rpm until uniform, then sequentially add 0.04 parts by mass of the penetrating agent, 0.8 parts by mass of the thickening agent, 0.2 parts by mass of the defoaming agent, and 28 parts by mass of water, continue stirring for 6 min to obtain the transparent waterproof paste for exterior walls;

[0032] The preparation steps of the composite prepolymer include:

[0033] Mix triethanolamine and polyester polyol according to the mass ratio 0.09:1, stir uniformly at 600 rpm and heat to 120℃, then dehydrate at -0.09 MPa for 60 min under reduced pressure, then cool to 75℃, then add MDI trimer with 10 times the mass of the polyester polyol, heat to 85℃, and keep the temperature for 2.5 h to obtain a composite prepolymer;

[0034] The preparation steps of the composite curing agent include:

[0035] Mix polyester polyol, 4-aminobenzoyl chloride, 4-hydroxy-2-methylbenzenesulfonic acid ammonium, chlorinated paraffin, transparent talc powder, 600 mesh mica powder, and anhydrous aluminum chloride according to the mass ratio 1:0.4:0.6:0.10:0.25:0.13:0.07, stir and mix at 600 rpm and heat to 65℃ for 3 h, then continue to heat to 110℃, dehydrate at -0.09 MPa for 60 min under reduced pressure, then cool to 75℃, then add plasticizer DOP with 0.2 times the mass of the polyester polyol, catalyst dibutyltin dilaurate with 0.03 times the mass of the polyester polyol, and defoaming agent with 0.04 times the mass of the polyester polyol, stir for 30 min, then cool and discharge to obtain a composite curing agent;

[0036] The polyester polyol is L3025 polyester polyol from Shanghai Shunrong Chemical Co., Ltd.; the penetrating agent is a water-soluble fluorine surfactant; the thickening agent is an alkali-swellable acrylate thickening agent; and the defoaming agent is an organic silicon-based defoaming agent.

[0037] Example 3

[0038] A preparation method of an external wall transparent waterproof paste includes the following preparation steps:

[0039] Mix 45 parts by mass of the composite prepolymer and 45 parts by mass of the composite curing agent, stir uniformly at 500 rpm, then sequentially add 0.06 parts by mass of the penetrating agent, 1.2 parts by mass of the thickening agent, 0.3 parts by mass of the defoaming agent, and 30 parts by mass of water, continue to stir for 8 min to obtain an external wall transparent waterproof paste;

[0040] The preparation steps of the composite prepolymer include:

[0041] Mix triethanolamine and polyester polyol according to the mass ratio 0.12:1, stir uniformly at 700 rpm and heat to 125℃, then dehydrate at -0.09 MPa for 65 min under reduced pressure, then cool to 80℃, then add MDI trimer with 12 times the mass of the polyester polyol, heat to 90℃, and keep the temperature for 3 h to obtain a composite prepolymer;

[0042] The preparation steps of the composite curing agent include:

[0043] The polyester polyol, 4-aminobenzoyl chloride, 4-hydroxy-2-methylbenzenesulfonic acid ammonium, chlorinated paraffin, transparent talc powder, 600 mesh mica powder, anhydrous aluminum chloride are mixed in a mass ratio of 1:0.6:0.8:0.10:0.25:0.14:0.08, stirred and mixed at 700 rpm and heated to 70°C for 3.5h, then continue to heat to 115°C, dehydrate for 65min under-0.09MPa, then cool to 80°C, add 0.25 times the mass of the polyester polyol plasticizer DOP, 0.04 times the mass of the polyester polyol catalyst dibutyltin dilaurate, 0.05 times the mass of the polyester polyol defoaming agent, stir for 30min, then cool and discharge, to obtain a composite curing agent;

[0044] Among them, the polyol is L3025 polyester polyol from Shanghai Shunrong Chemical Co., Ltd.; the penetrating agent is a water-soluble fluorine surfactant; the thickening agent is an alkali-swellable acrylate thickening agent; and the defoaming agent is an organic silicon defoaming agent.

[0045] Comparative Example 1

[0046] A preparation method of an external wall transparent waterproof paste, comprising the following preparation steps:

[0047] 40 parts by mass of the composite prepolymer and 35 parts by mass of the composite curing agent are mixed and stirred at 400 rpm until uniform, then 0.04 parts by mass of the penetrating agent, 0.8 parts by mass of the thickening agent, 0.2 parts by mass of the defoaming agent, and 28 parts by mass of water are added in sequence, and the stirring is continued for 6min to obtain the external wall transparent waterproof paste;

[0048] The preparation steps of the composite prepolymer include:

[0049] Polyethylene glycol and polyester polyol are mixed in a mass ratio of 0.09:1, stirred uniformly at 600 rpm and heated to 120°C, then dehydrated for 60min under-0.09MPa, then cooled to 75°C, then 10 times the mass of the polyester polyol MDI trimer is added, heated to 85°C, and reacted for 2.5h to obtain the composite prepolymer;

[0050] The preparation steps of the composite curing agent include:

[0051] The polyester polyol, 4-aminobenzoyl chloride, 4-hydroxy-2-methylbenzenesulfonic acid ammonium, chlorinated paraffin, transparent talc powder, 600 mesh mica powder, anhydrous aluminum chloride are mixed in a mass ratio of 1:0.4:0.6:0.10:0.25:0.13:0.07, stirred and mixed at 600 rpm, and heated to 65°C for 3h, then continue to heat to 110°C, dehydrate for 60min under reduced pressure to-0.09MPa, then cool to 75°C, add 0.2 times the mass of the polyester polyol plasticizer DOP, 0.03 times the mass of the polyester polyol catalyst dibutyltin dilaurate, 0.04 times the mass of the polyester polyol defoaming agent, stir for 30min, then cool and discharge, to obtain a composite curing agent;

[0052] The polyol is L3025 polyester polyol from Shanghai Shunrong Chemical Co., Ltd.; the penetrating agent is a water-soluble fluorine surfactant; the thickening agent is an alkali-swellable acrylate thickening agent; and the defoaming agent is an organic silicon defoaming agent.

[0053] Comparative Example 2

[0054] A preparation method of an external wall transparent waterproof paste, comprising the following preparation steps:

[0055] 40 parts by mass of the composite prepolymer and 35 parts by mass of the composite curing agent are mixed and stirred at 400 rpm until uniform, then 0.04 parts by mass of the penetrating agent, 0.8 parts by mass of the thickening agent, 0.2 parts by mass of the defoaming agent, and 28 parts by mass of water are added in sequence, and the stirring is continued for 6min to obtain the external wall transparent waterproof paste;

[0056] The preparation steps of the composite prepolymer include:

[0057] Triethanolamine and polyester polyol are mixed in a mass ratio of 0.09:1, stirred uniformly at 600 rpm and heated to 120°C, then dehydrated for 60min under reduced pressure to-0.09MPa, then cooled to 75°C, then 10 times the mass of the polyester polyol MDI is added, heated to 85°C, and reacted for 2.5h to obtain the composite prepolymer;

[0058] The preparation steps of the composite curing agent include:

[0059] The polyester polyol, 4-aminobenzoyl chloride, 4-hydroxy-2-methylbenzenesulfonic acid ammonium, chlorinated paraffin, transparent talc powder, 600 mesh mica powder, anhydrous aluminum chloride are mixed in a mass ratio of 1:0.4:0.6:0.10:0.25:0.13:0.07, stirred and mixed at 600 rpm and heated to 65°C for 3h, then continue to heat to 110°C, dehydrate for 60min under reduced pressure to-0.09MPa, then cool to 75°C, add 0.2 times the mass of the polyester polyol plasticizer DOP, 0.03 times the mass of the polyester polyol catalyst dibutyltin dilaurate, 0.04 times the mass of the polyester polyol defoaming agent, stir for 30min, then cool and discharge, to obtain a composite curing agent;

[0060] The polyol is L3025 polyester polyol from Shanghai Shunrong Chemical Co., Ltd.; the penetrating agent is a water-soluble fluorine surfactant; the thickening agent is an alkali-swellable acrylate thickening agent; and the defoaming agent is an organic silicon defoaming agent.

[0061] Comparative Example 3

[0062] A preparation method of an external wall transparent waterproof paste, comprising the following preparation steps:

[0063] 40 parts by mass of the composite prepolymer and 35 parts by mass of the composite curing agent are mixed and stirred at 400 rpm until uniform, then 0.04 parts by mass of the penetrating agent, 0.8 parts by mass of the thickening agent, 0.2 parts by mass of the defoaming agent, and 28 parts by mass of water are added in sequence, and the stirring is continued for 6min to obtain the external wall transparent waterproof paste;

[0064] The preparation steps of the composite prepolymer include:

[0065] Triethanolamine and polyester polyol are mixed in a mass ratio of 0.09:1, stirred uniformly at 600 rpm and heated to 120°C, then dehydrated for 60min under reduced pressure to-0.09MPa, then cooled to 75°C, then 10 times the mass of the polyester polyol isocyanate trimer is added, heated to 85°C, and reacted for 2.5h to obtain the composite prepolymer;

[0066] The preparation steps of the composite curing agent include:

[0067] The polyester polyol, 4-hydroxy-2-methyl benzene sulfonic acid ammonium, chlorinated paraffin, transparent talc powder, 600 mesh mica powder, anhydrous aluminum chloride are mixed in a mass ratio of 1:0.6:0.10:0.25:0.13:0.07, stirred and mixed at 600 rpm, and heated to 65°C for 3h, then continue to heat to 110°C, dehydrate for 60min under reduced pressure to-0.09MPa, then cool to 75°C, add 0.2 times the mass of the polyester polyol plasticizer DOP, 0.03 times the mass of the polyester polyol catalyst dibutyltin dilaurate, 0.04 times the mass of the polyester polyol defoaming agent, stir for 30min, then cool and discharge, to obtain a composite curing agent;

[0068] The polyol is L3025 polyester polyol from Shanghai Shunrong Chemical Co., Ltd.; the penetrating agent is a water-soluble fluorine surfactant; the thickening agent is an alkali-swellable acrylate thickening agent; and the defoaming agent is an organic silicon defoaming agent.

[0069] Comparative Example 4

[0070] A preparation method of an external wall transparent waterproof paste, comprising the following preparation steps:

[0071] 40 parts by mass of the composite prepolymer and 35 parts by mass of the composite curing agent are mixed and stirred at 400 rpm until uniform, then 0.04 parts by mass of the penetrating agent, 0.8 parts by mass of the thickening agent, 0.2 parts by mass of the defoaming agent, and 28 parts by mass of water are added in sequence, and the stirring is continued for 6min to obtain the external wall transparent waterproof paste;

[0072] The preparation steps of the composite prepolymer include:

[0073] Triethanolamine and polyol are mixed in a mass ratio of 0.09:1, stirred uniformly at 600 rpm and heated to 120°C, then dehydrated for 60min under reduced pressure to-0.09MPa, then cooled to 75°C, then 10 times the mass of the polyester polyol isocyanate trimer is added, heated to 85°C, and reacted for 2.5h to obtain the composite prepolymer;

[0074] The preparation steps of the composite curing agent include:

[0075] The polyol, 4-aminobenzoyl chloride, chlorinated paraffin, transparent talc powder, 600 mesh mica powder, anhydrous aluminum chloride are mixed in a mass ratio of 1:0.4:0.10:0.25:0.13:0.07, stirred and mixed at 600 rpm, and heated to 65°C for 3h, then continue to heat to 110°C, dehydrate for 60min under-0.09MPa, then cool to 75°C, add 0.2 times the mass of the polyester polyol of plasticizer DOP, 0.03 times the mass of the polyester polyol of catalyst dibutyltin dilaurate, 0.04 times the mass of the polyester polyol of defoaming agent, stir for 30min, then cool and discharge, to obtain a composite curing agent;

[0076] Among them, the polyol uses L3025 polyester polyol of Shanghai Shunrong Chemical Co., Ltd.; the penetrating agent uses a water-soluble fluorine surfactant; the thickening agent uses an alkali-swellable acrylate thickening agent; and the defoaming agent uses an organic silicon defoaming agent.

[0077] Effect example

[0078] The following Table 1 shows the analysis results of the waterproof performance, mechanical properties, and ultraviolet resistance of the external wall transparent waterproof paste prepared by using the examples 1 to 3 and the comparative examples 1 to 4 of the present application.

[0079] Table 1

[0080]

[0081] It can be found from Table 1 that the external wall transparent waterproof paste prepared by examples 1, 2, and 3 has good waterproof performance, mechanical properties, and ultraviolet resistance; from the comparison of the experimental data of examples 1, 2, and 3 and comparative examples 1 and 2, it can be found that the use of triethanolamine, polyester polyol, and isocyanate trimer to prepare a composite prepolymer has good waterproof performance and mechanical properties; and from the experimental data of examples 1, 2, and 3 and comparative examples 3 and 4, it can be found that the use of polyester polyol, 4-aminobenzoyl chloride, 4-hydroxy-2-methylbenzenesulfonic acid ammonium, chlorinated paraffin, transparent talc powder, 600 mesh mica powder, anhydrous aluminum chloride, plasticizer DOP, catalyst dibutyltin dilaurate, and defoaming agent to prepare a composite curing agent has good waterproof performance, mechanical properties, and ultraviolet resistance.

[0082] It will be apparent to those skilled in the art that the application is not limited to the details of the above-exemplified embodiments and that the present application can be implemented in other particular forms without departing from the spirit or essential characteristics of the present application. The embodiments should therefore be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the above description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No reference herein to any prior art is to be taken as an admission that the present application is not entitled to antedate such prior art by virtue of prior application. Any reference to the term "comprising" is to be construed in accordance with the definition of that term provided in the preamble to Article 69 of the European Patent Convention. Any reference to the term "comprising" is to be construed in accordance with the definition of that term provided in the preamble to Article 69 of the European Patent Convention.

Claims

1. An exterior wall transparent waterproof paste, characterized by, The raw material components include the following by weight parts: 35-45 parts of a composite prepolymer, 30-45 parts of a composite curing agent, 0.02-0.06 parts of a penetrating agent, 0.6-1.2 parts of a thickening agent, 0.1-0.3 parts of an antifoaming agent, and 26-30 parts of water; the composite curing agent is obtained by mixing a polyester polyol, 4-aminobenzoyl chloride, ammonium 4-hydroxy-2-methylbenzenesulfonate, chlorinated paraffin, transparent talc powder, 600-mesh mica powder, anhydrous aluminum chloride, plasticizer DOP, catalyst dibutyltin dilaurate, and antifoaming agent.

2. The transparent waterproofing paste for exterior walls according to claim 1, characterized in that, The penetrating agent is a water-soluble fluorine surfactant.

3. The transparent waterproofing paste for exterior walls according to claim 1, characterized in that, The thickening agent is an alkali-swellable acrylate thickening agent.

4. The transparent waterproofing paste for exterior walls according to claim 1, characterized by, The antifoaming agent is an organic silicon antifoaming agent.

5. The transparent waterproofing paste for exterior walls according to claim 1, characterized in that, The composite prepolymer is obtained by mixing triethanolamine, polyester polyol, and isocyanate trimer.

6. A process for the preparation of the transparent waterproofing paste for exterior walls as claimed in any one of claims 1 to 5, wherein, The preparation steps include the following: 35-45 parts of a composite prepolymer and 30-45 parts of a composite curing agent are mixed and stirred at 300-500 rpm until uniform, then 0.02-0.06 parts of a penetrating agent, 0.6-1.2 parts of a thickening agent, 0.1-0.3 parts of an antifoaming agent, and 26-30 parts of water are added in sequence, and the stirring is continued for 5-8 min to obtain an external wall transparent waterproof paste.

7. The method for preparing the transparent waterproof sealant for exterior walls according to claim 6, characterized in that, The preparation method of the composite prepolymer includes the following steps: triethanolamine and polyol are mixed in a mass ratio of 0.06-0.12:1, stirred uniformly at 500-700 rpm, and heated to 115-125℃, then dehydrated at a reduced pressure of-0.09 MPa for 55-65 min, then cooled to 70-80℃, then isocyanate trimer is added in an amount of 8-12 times the mass of the polyester polyol, heated to 80-90℃, and reacted for 2-3 h to obtain the composite prepolymer.

8. The method for preparing the transparent waterproof sealant for exterior walls according to claim 6, characterized in that, The preparation steps of the composite curing agent include the following: polyol, 4-aminobenzoyl chloride, ammonium 4-hydroxy-2-methylbenzenesulfonate, chlorinated paraffin, transparent talc powder, 600-mesh mica powder, and anhydrous aluminum chloride are mixed in a mass ratio of 1:0.2-0.6:0.4-0.8:0.10:0.25:0.12-0.14:0.06-0.08, stirred and mixed at 500-700 rpm, heated to 60-70℃, and stirred for 2.5-3.5 h, then heated to 105-115℃, dehydrated at a reduced pressure of-0.09 MPa for 55-65 min, then cooled to 70-80℃, then plasticizer DOP is added in an amount of 0.15-0.25 times the mass of the polyester polyol, catalyst dibutyltin dilaurate is added in an amount of 0.02-0.04 times the mass of the polyester polyol, and antifoaming agent is added in an amount of 0.03-0.05 times the mass of the polyester polyol, stirred for 30 min, then cooled and discharged to obtain the composite curing agent.

9. The method for preparing the transparent waterproof sealant for exterior walls according to claim 7, characterized in that, The polyester polyol is L3025 polyester polyol from Shanghai Shunrong Chemical Co., Ltd.

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