CN115433513A

CN115433513A - Two-component polyurethane waterproof coating composition, two-component polyurethane waterproof coating, and preparation method and application thereof

Info

Publication number: CN115433513A
Application number: CN202211129478.5A
Authority: CN
Inventors: 刘青青
Original assignee: Keshun Civil Building Materials Co ltd
Current assignee: Keshun Civil Building Materials Co ltd
Priority date: 2022-09-16
Filing date: 2022-09-16
Publication date: 2022-12-06
Anticipated expiration: 2042-09-16
Also published as: CN115433513B

Abstract

The invention relates to the field of building waterproofing, and particularly discloses a two-component polyurethane waterproof coating composition, a two-component polyurethane waterproof coating, and a preparation method and application thereof. The coating composition comprises the following components: (I) component A: the water-based polyurethane emulsion paint comprises a water-based polyurethane dispersion, a defoaming agent, a dispersing agent, a wetting agent, a film-forming auxiliary agent, a preservative, a thickening agent, a styrene-acrylic emulsion and a coupling agent; (II) component B: portland cement, mineral powder, quartz sand, a filler, a water reducing agent, cellulose ether and an ultraviolet-resistant absorbent; wherein the weight content ratio of the component A to the component B is 1:1.5-1.7; in the component B, the average grain diameter of the mineral powder is 7-20 μm. The two-component waterborne polyurethane waterproof coating provided by the invention is simple to construct, firm in bonding to a cement base layer, high in strength, good in impermeability and strong in ultraviolet resistance, and can provide good tensile strength and elongation at break for a paint film.

Description

Two-component polyurethane waterproof coating composition, two-component polyurethane waterproof coating, and preparation method and application thereof

Technical Field

The invention relates to the field of building waterproofing, and particularly relates to a two-component polyurethane waterproof coating composition, a two-component polyurethane waterproof coating, and a preparation method and application thereof.

Background

Building such as house, basement, municipal works because the building subject is mostly concrete structure, and the concrete is in the solidification process, appears capillary hole and shrinkage joint easily, can lead to the building seepage to appear. To prevent such leakage, a polyurethane waterproofing coating is applied to the cement structural base.

The water-based polyurethane emulsion can permeate into capillary holes and shrinkage joints in concrete, so that the structure of the concrete is more compact, the corrosion of water to the concrete structure is prevented, and the aims of leaking stoppage and water prevention are fulfilled.

However, the existing waterborne polyurethane waterproof paint is mainly a one-component waterborne polyurethane waterproof paint, and has the following technical problems:

in the aspect of materials, the film forming material is completely organic polyurethane, has poor affinity to inorganic cement wall surfaces, is directly coated on a cement base layer, has insufficient adhesive strength, and is easy to cause the phenomena of bulging and falling off of a paint film. Particularly, after the paint film is soaked in water for a long time, the paint film often falls off in a large range, so that the problem of water leakage of a building is caused.

In the aspect of construction, the waterborne polyurethane cement-based waterproof coating on the market at present is a three-component coating, namely polyurethane, a polyether curing agent and cement, which are packaged separately (the cement is high in alkalinity, and waterborne polyurethane molecules are easy to decompose and break). When in use, a waterproof cement base layer is required to be made in advance, and then the three components are mixed, stirred and coated for several times. Therefore, the production process is complex and the construction is complicated.

Therefore, the adhesive strength and the waterproof performance of the polyurethane waterproof coating are improved, the construction process of the waterborne polyurethane waterproof coating is simplified, and the method has very important significance.

Disclosure of Invention

The invention aims to overcome the defects of low adhesive strength, insufficient waterproof performance and complex construction process of the polyurethane waterproof coating in the prior art.

In order to achieve the above object, one aspect of the present invention provides a two-component aqueous polyurethane waterproof coating composition, which comprises a component a and a component B, wherein the coating composition comprises the following components in parts by weight:

(I) And (2) component A: the content of the aqueous polyurethane dispersoid is 500-600 parts by weight, the content of the defoaming agent is 1.5-2 parts by weight, the content of the dispersing agent is 1.5-2 parts by weight, the content of the wetting agent is 1.5-3 parts by weight, the content of the film-forming additive is 5-7 parts by weight, the content of the preservative is 1.5-2 parts by weight, the content of the thickening agent is 1.5-2.5 parts by weight, the content of the styrene-acrylic emulsion is 50-80 parts by weight and the content of the coupling agent is 1-2 parts by weight on a dry basis;

(II) component B: 200-250 parts of Portland cement, 250-300 parts of mineral powder, 270-300 parts of quartz sand, 400-450 parts of filler, 1.5-2.5 parts of water reducing agent, 0.2-1.5 parts of cellulose ether and 1-2 parts of ultraviolet-resistant absorbent;

wherein the weight content ratio of the component A to the component B is 1:1.5-1.7;

in the component B, the average grain diameter of the mineral powder is 7-20 μm.

The second aspect of the invention provides a method for preparing a two-component water-based polyurethane waterproof coating, which comprises the following steps:

(1) Preparation of a liquid agent: carrying out first contact on the aqueous polyurethane dispersion and the styrene-acrylic emulsion to obtain a mixture I;

secondly, the mixture I is contacted with a defoaming agent, a dispersing agent, a wetting agent, a film-forming assistant and a thickening agent to obtain a mixture II;

mixing the mixture II with a preservative I to obtain a liquid;

(2) Preparing powder: carrying out third contact on portland cement, mineral powder, quartz sand, a filler, a water reducing agent, cellulose ether and an ultraviolet-resistant absorbent to obtain powder;

(3) Preparing a coating: mixing the liquid agent and the powder agent according to the weight ratio of 1: and (3) mixing II with the use amount of 1.5-1.7 to obtain the bi-component polyurethane waterproof coating.

The third aspect of the invention provides a two-component waterborne polyurethane waterproof coating prepared by the method of the second aspect.

The fourth aspect of the invention provides the application of the two-component water-based polyurethane waterproof coating material in the third aspect in the field of building waterproofing.

The two-component waterborne polyurethane waterproof coating provided by the invention is simple to construct, firm in bonding to a cement base layer, high in strength, good in impermeability and strong in ultraviolet resistance, and can provide good tensile strength and elongation at break for a paint film.

Detailed Description

The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.

It is to be noted that, in various aspects of the present invention, the present invention is described only once in one aspect thereof with respect to the same components or terms in the aspects without repeated descriptions, and those skilled in the art should not be construed as limiting the present invention.

As described above, the first aspect of the present invention provides a two-component aqueous polyurethane waterproof coating composition, which comprises a component a and a component B, wherein the coating composition comprises the following components in parts by weight:

(I) The component A comprises: the content of the aqueous polyurethane dispersoid is 500-600 parts by weight, the content of the defoaming agent is 1.5-2 parts by weight, the content of the dispersing agent is 1.5-2 parts by weight, the content of the wetting agent is 1.5-3 parts by weight, the content of the film-forming additive is 5-7 parts by weight, the content of the preservative is 1.5-2 parts by weight, the content of the thickening agent is 1.5-2.5 parts by weight, the content of the styrene-acrylic emulsion is 50-80 parts by weight, and the content of the coupling agent is 1-2 parts by weight on a dry basis;

The inventors found that a waterproof coating material prepared from a composition containing the mineral powder in the particle size range is excellent in tack performance.

In some embodiments of the present invention, in component a, the defoamer is selected from at least one of a mineral oil defoamer and a silicone defoamer.

Preferably, the defoamer is a silicone defoamer.

More preferably, the defoamer is AGITAN731 available from australian limited, beijing, oriental.

Preferably, in the a component, the dispersant is selected from at least one of an ammonium salt dispersant and a sodium salt dispersant.

More preferably, the dispersant is an ammonium salt dispersant.

More preferably, the dispersant is WA-8005, available from Wanjun chemical technology, inc., guangzhou.

Preferably, in the component A, the wetting agent is selected from at least one of sodium dodecyl sulfate and octylphenol polyoxyethylene ether.

More preferably, the wetting agent is sodium lauryl sulfate.

Preferably, in the component A, the film-forming assistant is selected from at least one of ester compounds and ethylene glycol monopropyl ether.

More preferably, the coalescing agent is an ester compound.

More preferably, the coalescent is AH-12 available from Australian, inc. of Beijing Oriental.

Preferably, the preservative is a cason-type preservative.

More preferably, the preservative is TroyK14 available from troy corporation, usa.

Preferably, in the a component, the thickener is selected from at least one of alkali swelling thickeners, low viscosity cellulose ethers having a viscosity of 2000 to 4000 mPa-s as measured as a 1wt% aqueous solution at 21 to 25 ℃.

Preferably, in the A component, the coupling agent is selected from at least one of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, r-aminopropyl triethoxy silane and methyl trimethoxy silane.

More preferably, the coupling agent is gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane. The inventor finds that the waterproof coating prepared under the preferable condition has higher tensile strength and adhesive force strength.

Preferably, in the A component, the solid content of the aqueous polyurethane dispersion is 40-60wt%.

Preferably, in the component A, the solid content of the styrene-acrylic emulsion is 50-65wt%.

In some embodiments of the invention, in the B component, the portland cement is selected from at least one of early strength portland cements with strength in the grades po32.5r-po42.5r.

Preferably, in the B component, the quartz sand has an average particle size of 106 to 149 μm.

Preferably, in the component B, the filler is at least one selected from talc powder and heavy calcium carbonate having an average particle diameter of 30 to 60 μm.

Preferably, in the component B, the water reducing agent is at least one selected from melamine water reducing agent, polycarboxylic acid water reducing agent and naphthalene water reducing agent.

More preferably, the water reducing agent is a melamine water reducing agent.

Preferably, in the B component, the cellulose ether is selected from at least one of low viscosity cellulose ethers having a viscosity of 2000 to 4000mPa · s as measured as a 1wt% aqueous solution at 21 to 25 ℃. The inventor finds that the technical scheme under the preferable condition provides the waterproof coating with outstanding tensile property.

Preferably, in the component B, the ultraviolet-resistant absorbent is at least one selected from benzophenone ultraviolet-resistant absorbents and salicylate ultraviolet-resistant absorbents.

More preferably, the ultraviolet light resistant absorbent is a benzophenone-based ultraviolet light absorbent.

As mentioned above, the second aspect of the present invention provides a method for preparing a two-component polyurethane waterproof coating material, which is carried out by using each component of the composition provided in the first aspect, the method comprising:

(1) Preparing a liquid agent by using the component A: carrying out first contact on the aqueous polyurethane dispersion and the styrene-acrylic emulsion to obtain a mixture I;

mixing the mixture II with a preservative I to obtain a liquid;

(2) Preparing powder by using the component B: carrying out third contact on portland cement, mineral powder, quartz sand, a filler, a water reducing agent, cellulose ether and an ultraviolet-resistant absorbent to obtain powder;

In some embodiments of the invention, in step (1), the conditions of the first contacting at least satisfy: under the condition of stirring, the rotating speed is 400-700r/min, and the time is 5-25min.

Preferably, in step (1), the conditions of the second contacting at least satisfy: under the condition of stirring, the rotating speed is 800-1000r/min, and the time is 5-25min.

Preferably, in step (1), the condition of mixing I at least satisfies: under the condition of stirring, the rotating speed is 500-1000r/min, and the time is 2-3min.

Preferably, in step (2), the condition of the third contacting at least satisfies: under the condition of stirring, the rotating speed is 400-700r/min, and the time is 10-15min.

Preferably, in the step (3), the condition of mixing II at least satisfies: under the condition of stirring, the rotating speed is 600-800r/min, and the time is 3-5min.

In some embodiments of the invention, the method further comprises preparing the aqueous polyurethane dispersion using a process comprising:

s1, mixing polyethylene glycol, trimethylolpropane and organic tin, and carrying out fourth contact to obtain a mixture III;

s2, mixing the mixture III with toluene diisocyanate and diphenylmethane diisocyanate, and carrying out a first reaction to obtain a mixture IV;

s3, mixing the mixture IV with acetone and butanediol, carrying out a second reaction, and removing the acetone to obtain a mixture V;

s4, dispersing the mixture V with water, and then mixing the mixture V with a nonionic emulsifier III to obtain the aqueous polyurethane dispersion.

Preferably, in S1, the organotin, the polyethylene glycol and the trimethylolpropane are used in a weight ratio of 1:25-50:2-5. The inventor finds that the two-component polyurethane waterproof coating prepared under the preferable condition has higher adhesive strength with cement and better waterproof performance.

Preferably, the organic tin is at least one selected from dimethyl tin dichloride and dioctyl tin oxide.

Preferably, in S1, the condition of the fourth contact at least satisfies: under the condition of stirring, the pressure is between-0.5 and 0.1Mpa, the temperature is between 110 and 135 ℃, the rotating speed is between 1100 and 1300r/min, and the time is between 1 and 3 hours.

According to a preferred embodiment, the method further comprises: and after the fourth contact of S1 is finished, cooling the mixture III to 60-80 ℃, and then performing step S2. The inventors have found that this preference is advantageous for increasing the reaction rate and thus reducing the production cost of the aqueous polyurethane dispersion and the waterproof coating.

Preferably, in S2, the mixture III, the toluene diisocyanate and the diphenylmethane diisocyanate are used in a weight ratio of 1:4-7:4-7.

Preferably, in S2, the conditions of the first reaction at least satisfy: under the condition of stirring, the temperature is 70-110 ℃, the rotating speed is 1100-1300r/min, and the time is 1-3h.

Preferably, in S3, the mixture IV, the acetone and the butanediol are used in a weight ratio of 20-25:2-5:1.

preferably, in S3, the conditions of the second reaction at least satisfy: under the condition of stirring, the temperature is 70-80 ℃, the rotating speed is 1300-1600r/min, and the time is 2-3h.

It should be noted that the present invention has no specific requirements on the way and the container for removing acetone, and may be exemplified by: and after the second reaction of S3 is finished, cooling to room temperature, and removing acetone in an evaporation kettle.

Preferably, in S4, the mixture V, the water and the nonionic emulsifier are used in a weight ratio of 15-25:10-25:1.

preferably, in S4, the water is water at 0 ± 4 ℃.

Preferably, the nonionic emulsifier is at least one selected from fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether and fatty acid polyoxyethylene ester.

Preferably, in S4, the condition of dispersion at least satisfies: under the condition of stirring, the temperature is 70-80 ℃, the rotating speed is 11000-13000r/min, and the time is 1-3h.

Preferably, in S4, the condition of the mixture III at least satisfies: under the condition of stirring, the temperature is 70-80 ℃, the rotating speed is 10000-15000r/min, and the time is 60-80min.

As mentioned above, the third aspect of the present invention provides a two-component aqueous polyurethane waterproof coating material prepared by the method of the second aspect.

As mentioned above, the fourth aspect of the present invention provides the use of the two-component aqueous polyurethane waterproofing paint of the third aspect in the field of waterproofing of buildings.

Compared with the prior art, the two-component waterborne polyurethane waterproof coating provided by the invention is simple to construct, firm in bonding to a cement base layer, high in strength, good in impermeability and strong in ultraviolet resistance, and can provide good tensile strength and elongation at break for a paint film.

The present invention will be described in detail below by way of examples. In the following examples, the raw materials used are all common commercial products unless otherwise specified.

Some of the starting materials and sources used in the following examples are as follows:

organotin:

organotin I: dimethyltin dichloride, brand D807930, available from jaboticaglume chemical technology ltd;

organotin II: dioctyl tin oxide, no. DOTO-062, available from junan rongzheng chemical ltd.

Dispersing agent:

dispersant I: ammonium salt dispersant, brand WA-8005, available from Wanjun chemical technology, inc., guangzhou;

dispersant II: sodium salt dispersant, trade name LOPON800, available from Aohan, inc. of Beijing Oriental.

Wetting agent: sodium dodecyl sulfate, brand k12, available from Zhengzhou Chuang beauty products Ltd.

Defoaming agent: an organosilicon defoamer, having the designation AGITAN731, available from Australian Han Co., ltd, orient, beijing.

Film-forming auxiliary agent: the ester compound, sold under the trademark AH-12, was purchased from Aohan, inc., east Beijing.

Preservative:

the kasong preservative: isothiazolinones, trade name TroyK14, were purchased from troley, usa.

Styrene-acrylic emulsion: the solids content was 55wt%, and the trade designation 300SL, available from Bardefy corporation.

Coupling agent:

a coupling agent I: gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane, sold under the trademark H86, available from Sanfu New materials, inc. in Tang mountain;

coupling agent II: methyltrimethoxysilane, brand W311, available from tang shangfu new materials, ltd;

coupling agent III: 3-aminopropylmethyldiethoxysilane, available from Sanfu New materials, inc., in Tang mountain under the trade designation SF-A520.

Thickening agent: low-viscosity cellulose ethers having a viscosity of 2000 to 4000 mPas in 1 wt.% aqueous solution at 23 ℃ under the designation HS30000YP2, available from Clariant, germany.

Portland cement: early strength portland cement of the po42.5r grade was purchased from ansu limited.

Quartz sand: the average particle size was 130. + -. 5 μm and was purchased from Tokyo mineral products, inc., lingshu county.

Mineral powder:

mineral powder I: blast furnace slag having an average particle size of 15 μm, available from NanYi mineral processing plant, lingshou county;

mineral powder II: blast furnace slag having an average particle size of 9 μm was purchased from NanYi mineral processing plant, ling shou county.

Filling: talc powder having an average particle size of 37 μm was obtained from Guangzhou Highning chemical raw materials Co.

Water reducing agent: melamine, brand SM-F, was purchased from chemical technology, inc. of sunny, jinan.

Cellulose ether: a low viscosity cellulose ether having a viscosity of 2000-2200mPa · s in a 1 wt.% aqueous solution at 23 ℃, having a trade name HK400, available from Aohan Limited, oriental, beijing.

Ultraviolet light absorber: 2-hydroxy-4-n-octoxybenzophenone, under the designation UV-531, was purchased from Tianjin Lianlong New materials GmbH.

Cement: the 28d compressive strength is more than 42.5MPa and is purchased from Anhui sea snail GmbH.

A dispersion machine: the model is GFJ-0.4, and is purchased from Shanghai modern environmental engineering technology Co.

The tensile strength, the elongation at break, the bonding strength, the water impermeability and the impermeability are obtained by testing according to GB/T23445-2009II type standard.

In the present invention, room temperature means 25. + -. 2 ℃.

The vacuum in the present invention means a pressure of-0.5 to 0.1MPa.

In the following examples, each "part" or each "part by weight" means 100g unless otherwise specified.

Example 1

This example illustrates the preparation of a water-repellent coating composition according to the invention according to the formulation and process parameters given in Table 1, and according to the method described below.

The method for preparing the waterproof coating comprises the following steps:

preparing an aqueous polyurethane dispersion:

s1, adding polyethylene glycol, trimethylolpropane and organic tin into a synthesis kettle, mixing, and carrying out fourth contact under a vacuum condition to obtain a mixture III;

s2, cooling the mixture III to 70 ℃, mixing the mixture III with toluene diisocyanate and diphenylmethane diisocyanate in a synthesis kettle, and carrying out a first reaction to obtain a mixture IV;

s3, mixing the mixture IV with acetone and butanediol, carrying out a second reaction, cooling to room temperature, and removing acetone in an evaporation kettle to obtain a mixture V;

s4, dispersing the mixture V with water at 0 ℃, and then mixing III with a nonionic emulsifier to obtain an aqueous polyurethane dispersion, which is marked as dispersion I.

Wherein, in S1, the fourth contact is carried out under the condition of stirring, the pressure is 0.1Mpa, the temperature is 120 ℃, the rotating speed is 1200r/min, the time is 2h, and the dosage weight ratio of the organic tin, the polyethylene glycol and the trimethylolpropane is 1:30:3;

in S2, the first reaction is carried out under the condition of stirring, the temperature is 90 ℃, the rotating speed is 1200r/min, the time is 2h, and the weight ratio of the mixture III, the toluene diisocyanate and the diphenylmethane diisocyanate is 1:200:200 of a carrier;

in S3, the second reaction is carried out under the condition of stirring, the temperature is 75 ℃, the rotating speed is 1500r/min, the time is 2h, and the weight ratio of the mixture IV, the acetone and the butanediol is 22:4:1;

in S4, the dispersing and mixing III are carried out under the condition of stirring, the temperature is 75 ℃, the rotating speed is 12000r/min, the time is 2h, and the weight ratio of the mixture V, the water and the non-ionic emulsifier is 20:20:1.

(1) Preparation of a liquid agent: carrying out first contact on the prepared waterborne polyurethane dispersoid and the styrene-acrylic emulsion to obtain a mixture I;

secondly, the mixture I is contacted with a defoaming agent, a dispersing agent, a wetting agent, a film-forming assistant and a thickening agent in a dispersion machine to obtain a mixture II;

mixing the mixture II with a preservative I to obtain a liquid;

(3) Preparing a coating: mixing the liquid agent and the powder agent according to the weight ratio of 1:1.6, and mixing II to obtain the bi-component polyurethane waterproof coating, which is marked as P1.

Example 2

This example prepares a water-resistant coating using a formulation and method similar to that of example 1, except that: the preparation conditions are changed, and the formulas for preparing the aqueous polyurethane dispersoid are different, so that the aqueous polyurethane dispersoid is marked as dispersoid II; a water-repellent coating was prepared, denoted P2, see table 1.

Example 3

This example prepares a water-resistant coating using a formulation and method similar to that of example 1, except that: the liquid and powder preparations have different formulas.

Obtaining a water-based polyurethane dispersoid which is marked as dispersoid III; a water-repellent coating was prepared, denoted P3, see in particular table 1.

Example 4

This example prepared a water-resistant coating using a formulation and method similar to example 1, except that: a commercially available aqueous polyurethane dispersion (purchased from Wanhua chemical group, inc., with the brand number of 8355) is recorded as dispersion IV to replace the aqueous polyurethane dispersion prepared by the invention; a water-repellent coating was prepared, designated P4, see table 1.

Example 5

This example prepared a water-resistant coating using a formulation and method similar to example 1, except that: when the liquid agent is prepared, the coupling agent III is adopted to replace the coupling agent I.

Obtaining a water-based polyurethane dispersion, and marking as a dispersion V; a water-repellent coating was prepared, denoted P5, see in particular table 1.

Comparative example 1

This example prepared a water-resistant coating using a formulation and method similar to example 1, except that: when preparing the powder, the amount of the mineral powder I is 150 parts by weight, and 150 parts by weight of cement is added at the same time.

Obtaining a water-based polyurethane dispersion which is marked as dispersion VI; a water-repellent coating was prepared, designated DP1, see table 1.

Test example 1

The waterproof coatings prepared in examples and comparative examples were tested for tensile strength, elongation at break, adhesive strength, water impermeability and water impermeability according to the GBT23445-2009II standard, and the specific test results are shown in table 2.

TABLE 1

TABLE 1 continuation of the table

TABLE 2

From the results, the two-component waterborne polyurethane waterproof coating provided by the invention has the advantages of high adhesive strength, outstanding tensile property, good impermeability and simple construction.

The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.

Claims

1. The two-component polyurethane waterproof coating composition is characterized by comprising a component A and a component B, wherein the coating composition comprises the following components:

(I) And (2) component A: the content of the aqueous polyurethane dispersoid is 500-600 parts by weight, the content of the defoaming agent is 1.5-2 parts by weight, the content of the dispersing agent is 1.5-2 parts by weight, the content of the wetting agent is 1.5-3 parts by weight, the content of the film-forming additive is 5-7 parts by weight, the content of the preservative is 1.5-2 parts by weight, the content of the thickening agent is 1.5-2.5 parts by weight, the content of the styrene-acrylic emulsion is 50-80 parts by weight, and the content of the coupling agent is 1-2 parts by weight on a dry basis;

in the component B, the average particle size of the mineral powder is 7-20 μm.

2. The composition of claim 1, wherein in the a-side, the defoamer is selected from at least one of a mineral oil defoamer and a silicone defoamer; and/or

The dispersant is at least one selected from ammonium salt dispersant and sodium salt dispersant; and/or

The wetting agent is selected from at least one of sodium dodecyl sulfate and octyl phenol polyoxyethylene ether; and/or

The film-forming assistant is at least one selected from ester compounds and ethylene glycol monopropyl ether; and/or

The preservative is a kasong preservative; and/or

The thickener is at least one selected from alkali swelling thickener and low viscosity cellulose ether with viscosity of 2000-4000 mPa.s measured by 1wt% aqueous solution at 21-25 deg.C; and/or

The coupling agent is at least one of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, r-aminopropyl triethoxy silane and methyl trimethoxy silane; and/or

The solid content of the aqueous polyurethane dispersion is 40-60wt%;

the solid content of the styrene-acrylic emulsion is 50-65wt%.

3. The composition as claimed in claim 1, wherein, in component B, the portland cement is selected from at least one of early strength portland cements with strength of the grades po32.5r-po42.5r; and/or

The average grain diameter of the quartz sand is 106-149 mu m; and/or

The filler is at least one of talcum powder and heavy calcium with the average grain diameter of 30-60 mu m; and/or

The water reducing agent is at least one selected from a melamine water reducing agent, a polycarboxylic acid water reducing agent and a naphthalene water reducing agent; and/or

The cellulose ether is selected from at least one of low-viscosity cellulose ethers having a viscosity of 2000 to 4000mPa s measured as a 1wt% aqueous solution at 21 to 25 ℃; and/or

The ultraviolet resistant absorbent is at least one selected from benzophenone ultraviolet absorbent and salicylate ultraviolet absorbent.

4. The composition of any one of claims 1-3, wherein in component A, the defoamer is a silicone defoamer; the dispersant is an ammonium salt dispersant; the coupling agent is gamma- (2, 3-epoxy propoxy) propyl trimethoxy silane; the wetting agent is sodium dodecyl sulfate; the film-forming auxiliary agent is an ester compound;

in the component B, the water reducing agent is a melamine water reducing agent; the ultraviolet resistant absorbent is benzophenone ultraviolet absorbent.

5. A process for the preparation of a two-component polyurethane waterproofing coating, using the components of the composition according to any of claims 1 to 4, characterized in that it comprises:

mixing the mixture II with a preservative I to obtain a liquid;

(2) Preparing powder by using the component B: carrying out third contact on portland cement, mineral powder, quartz sand, a filler, a water reducing agent, cellulose ether and an anti-ultraviolet absorbent to obtain powder;

(3) Preparing a coating: mixing the liquid agent and the powder agent according to the weight ratio of 1:1.5-1.7, and mixing II to obtain the bi-component polyurethane waterproof coating.

6. The method of claim 5, wherein in step (1), the condition of the first contacting is at least satisfied: stirring at 400-700r/min for 5-25min; and/or

In the step (1), the conditions of the second contact at least satisfy: stirring at 800-1000r/min for 5-25min; and/or

In step (1), the condition of mixing I at least satisfies: stirring at 500-1000r/min for 2-3min; and/or

In step (2), the condition of the third contact at least satisfies: stirring at 400-700r/min for 10-15min; and/or

In step (3), the condition of mixing II at least satisfies: under the condition of stirring, the rotating speed is 600-800r/min, and the time is 3-5min.

7. The method of claim 5 or 6, further comprising preparing the aqueous polyurethane dispersion using a process comprising:

8. The method according to claim 7, wherein in S1, the organotin, the polyethylene glycol, and the trimethylolpropane are used in a weight ratio of 1:25-50:2-5; and/or

The organic tin is at least one of dimethyl tin dichloride and dioctyl tin oxide; and/or

In S1, the condition of the fourth contact at least satisfies: under the condition of stirring, the pressure is-0.5 to 0.1Mpa, the temperature is 110 to 135 ℃, the rotating speed is 1100 to 1300r/min, and the time is 1 to 3 hours; and/or

In S2, the weight ratio of the mixture III, the toluene diisocyanate and the diphenylmethane diisocyanate is 1:4-7:4-7; and/or

In S2, the conditions of the first reaction at least satisfy: stirring at 70-110 deg.C at 1100-1300r/min for 1-3h; and/or

In S3, the mixture IV, the acetone and the butanediol are used in a weight ratio of 20-25:2-5:1; and/or

In S3, the conditions of the second reaction at least satisfy: stirring at 70-80 deg.C at 1300-1600r/min for 2-3h; and/or

In S4, the weight ratio of the mixture V, water and the nonionic emulsifier is 15-25:10-25:1; the nonionic emulsifier is selected from at least one of fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether and fatty acid polyoxyethylene ester; and/or

In S4, the condition of dispersion at least satisfies: under the condition of stirring, the temperature is 70-80 ℃, the rotating speed is 11000-13000r/min, and the time is 1-3h; and/or

In S4, the condition of the mixture III at least satisfies: under the condition of stirring, the temperature is 70-80 ℃, the rotating speed is 10000-15000r/min, and the time is 60-80min.

9. A two-component polyurethane waterproofing coating prepared by the method of any of claims 5 to 8.

10. Use of the two-component polyurethane waterproofing coating according to claim 9 in waterproofing materials.