CN115433513B

CN115433513B - Bi-component polyurethane waterproof coating composition, bi-component polyurethane waterproof coating and preparation method and application thereof

Info

Publication number: CN115433513B
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: 2023-05-26
Anticipated expiration: 2042-09-16
Also published as: CN115433513A

Abstract

The invention relates to the field of building waterproofing, and particularly discloses a double-component polyurethane waterproof coating composition, a double-component polyurethane waterproof coating, a preparation method and application thereof. The coating composition comprises the following components: (I) A component: the polyurethane foam comprises an aqueous 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: silicate cement, mineral powder, quartz sand, filler, water reducing agent, cellulose ether and 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 particle size of the mineral powder is 7-20 mu m. The bi-component water-based polyurethane waterproof paint provided by the invention has the advantages of simple construction, firm bonding to a cement base layer, high strength, good impermeability and strong ultraviolet resistance, and can provide good tensile strength and elongation at break for a paint film.

Description

Bi-component polyurethane waterproof coating composition, bi-component polyurethane waterproof coating and preparation method and application thereof

Technical Field

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

Background

Building such as house, basement, municipal works because the building main part is mostly concrete structure, and the concrete appears capillary hole and shrinkage joint easily in the solidification process, can lead to the building to appear the seepage. To prevent such leakage, a cement structure substrate is painted with a polyurethane waterproof paint.

The aqueous polyurethane emulsion can permeate into capillary holes and shrinkage joints in the concrete, so that the concrete structure is more compact, and the erosion of water to the concrete structure is prevented, thereby achieving the purposes of plugging and waterproofing.

However, the existing water-based polyurethane waterproof coating is mainly a single-component water-based polyurethane waterproof coating, and has the following technical problems:

in the aspect of materials, the film forming substance 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 of paint films. Especially 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 building water leakage is caused.

In terms of construction, the water-based polyurethane cement-based waterproof paint on the current market is a three-component paint, namely polyurethane, polyether curing agent and cement which are packaged separately (the alkalinity of cement is high, and water-based polyurethane molecules are easy to decompose and break). When in use, the waterproof cement base layer needs to be prepared in advance, and then the three components are mixed and stirred and painted in multiple times. So the production process is complex and the construction is complex.

Therefore, the adhesive strength and the waterproof performance of the polyurethane waterproof coating are improved, the construction process of the water-based polyurethane waterproof coating is simplified, and the water-based polyurethane waterproof coating 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, the present invention provides a two-component aqueous polyurethane waterproof coating composition, comprising a component a and a component B, wherein the coating composition comprises the following components in parts by weight:

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

(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 reducer, 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 particle size of the mineral powder is 7-20 mu m.

The second aspect of the present invention provides a method for preparing a two-component aqueous polyurethane waterproof paint, the method comprising:

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

carrying out second contact on the mixture I and a defoaming agent, a dispersing agent, a wetting agent, a film forming auxiliary agent and a thickening agent to obtain a mixture II;

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

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

(3) Preparing a coating: the weight ratio of the liquid agent to the powder is 1: mixing II with the dosage of 1.5-1.7 to obtain the double-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 an application of the two-component waterborne polyurethane waterproof coating in the field of building waterproofing.

The bi-component water-based polyurethane waterproof paint provided by the invention has the advantages of simple construction, firm bonding to a cement base layer, high strength, good impermeability and strong ultraviolet resistance, and can provide good tensile strength and elongation at break for a paint film.

Detailed Description

The endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and are understood to encompass values approaching those ranges or values. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.

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

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

The inventors found that the waterproof paint prepared from the composition containing the fine ore powder in the particle size range is excellent in adhesion property.

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

Preferably, the defoamer is a silicone defoamer.

More preferably, the defoamer is AGITAN731 available from australian limited in tokyo.

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 dispersing agent is WA-8005 available from Wan Jun chemical technology Co., guangzhou.

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

More preferably, the wetting agent is sodium dodecyl sulfate.

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

More preferably, the film forming aid is an ester compound.

More preferably, the coalescent is AH-12 from Australia, beijing Oriental.

Preferably, the preservative is a kathon preservative.

More preferably, the preservative is TroyK14 from troley corporation of the united states.

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

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

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

Preferably, in component A, the aqueous polyurethane dispersion has a solids content of 40 to 60% by weight.

Preferably, in the A component, the styrene-acrylic emulsion has a solids content of 50 to 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 having a strength of the order PO32.5R-PO42.5R.

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

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

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

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 4000 mPa.s as measured in a 1 wt.% aqueous solution at 21 to 25 ℃. The inventors found that the tensile properties of the waterproof coating provided by the technical solution in this preferred case are outstanding.

Preferably, in the B component, the ultraviolet-resistant absorber is at least one selected from a benzophenone-based ultraviolet absorber and a salicylate-based ultraviolet absorber.

More preferably, the ultraviolet absorber is a benzophenone-type ultraviolet absorber.

As previously described, a second aspect of the present invention provides a process for preparing a two-component polyurethane waterproofing paint using the components of the composition provided in the first aspect, the process 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 to obtain a liquid agent;

(2) The powder is prepared by using the component B: carrying out third contact on silicate cement, mineral powder, quartz sand, filler, water reducer, cellulose ether and ultraviolet-resistant absorbent to obtain powder;

In some embodiments of the invention, in step (1), the conditions of the first contact at least satisfy: the stirring is carried out 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 contact at least satisfy: the stirring is carried out 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 the mixture I at least satisfies: the stirring is carried out under the condition of 500-1000r/min for 2-3min.

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

Preferably, in step (3), the conditions of said mixing II at least satisfy: the stirring is carried out 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 procedure comprising:

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

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

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

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

Preferably, in S1, the weight ratio of the organotin, the polyethylene glycol, and the trimethylolpropane is 1:25-50:2-5. The inventor discovers that the two-component polyurethane waterproof paint prepared under the preferred condition has higher adhesive strength with cement and better waterproof performance.

Preferably, the organotin is at least one selected from the group consisting of dimethyltin dichloride and dioctyltin oxide.

Preferably, in S1, the condition of the fourth contact at least satisfies: the process is carried out 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 (2) cooling the mixture III to 60-80 ℃ after the fourth contact of the step (S1) is finished, and then carrying out the step (S2). The inventors have found that this preference contributes to an increase in the reaction rate, thereby reducing the cost of preparing aqueous polyurethane dispersions and water-repellent coatings.

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

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

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

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

It should be noted that, the mode and the container for removing the acetone are not specifically required in the present invention, and may be exemplified by: after the second reaction of S3 is completed, acetone is removed in an evaporation kettle after cooling to room temperature.

Preferably, in S4, the mixture V, water, nonionic emulsifier is 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 the group consisting of fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether and fatty acid polyoxyethylene ester.

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

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

As described above, the third aspect of the present invention provides a two-component aqueous polyurethane waterproofing paint prepared by the method of the second aspect.

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

Compared with the prior art, the bi-component water-based polyurethane waterproof paint provided by the invention has the advantages of simple construction, firm bonding to a cement base layer, high strength, good impermeability and strong ultraviolet resistance, and can provide good tensile strength and elongation at break for a paint film.

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

Some of the raw materials and sources used in the examples below were as follows:

organotin:

organotin I: dimethyl tin dichloride, brand D807930, available from Shandong Jiayi chemical technology Co., ltd;

organotin II: dioctyl tin oxide, DOTO-062, available from Jinan Rong Zheng chemical Co., ltd.

Dispersing agent:

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

dispersant II: sodium salt dispersant, trade name LOPON800, available from Aohan, oriental, beijing.

Wetting agent: sodium dodecyl sulfate, trade name k12, was purchased from zheng state brand beautification engineering, inc.

Defoaming agent: the silicone defoamer, trademark AGITAN731, was purchased from australian limited in eastern, beijing.

Film forming auxiliary agent: the ester compound, with the trademark AH-12, is purchased from Australia, beijing Oriental.

Preservative:

kathon preservative: isothiazolinones, trade mark TroyK14, are available from the american trojan company.

Styrene-acrylic emulsion: the solids content was 55wt%, grade 300SL, available from BaderFu.

Coupling agent:

coupling agent I: gamma- (2, 3-epoxypropoxy) propyl trimethoxysilane, trade name H86, available from Tangshan Sanfu New Material Co., ltd;

coupling agent II: methyltrimethoxysilane, trade name W311, available from Tangshan Sanfu New Material Co., ltd;

coupling agent III: 3-aminopropyl methyl diethoxy silane with the trade name SF-A520 is purchased from Tangshan Sanfu New Material Co.

And (3) a thickening agent: a low-viscosity cellulose ether having a viscosity of 2000-4000 mPas in a 1% by weight aqueous solution at 23℃is available under the designation HS30000YP2 from Cortain, germany.

Portland cement: PO42.5R grade early strength Portland cement, available from Anhui conch, inc.

Quartz sand: the average particle diameter is 130+ -5 μm, and is purchased from Minyo mineral products Limited in Lingshu county.

Mineral powder:

mineral powder I: blast furnace slag, having an average particle size of 15 μm, purchased from Yi mineral processing plant company, lingshu county;

mineral powder II: blast furnace slag, having an average particle size of 9 μm, was purchased from Yi mineral processing factories, inc. in the south of the Lingshu county.

And (3) filling: talc powder having an average particle diameter of 37 μm was purchased from Guangzhou high-rise chemical raw materials Co.

Water reducing agent: melamine, trademark SM-F, was purchased from Jinan sunny chemical technology Co., ltd.

Cellulose ether: a low viscosity cellulose ether having a viscosity of 2000-2200 mPa.s in a 1wt% aqueous solution at 23℃is available from Australia, inc. in Beijing.

Ultraviolet resistant absorbent: 2-hydroxy-4-n-octoxybenzophenone, trade name UV-531, available from Tianjin An Long New Material Co., ltd.

And (3) cement: the 28d compressive strength was greater than 42.5MPa, purchased from Anhui conch Co., ltd.

Dispersing machine: the model is GFJ-0.4, which is purchased from Shanghai modern environmental engineering Co.

Tensile strength, elongation at break, adhesive strength, water impermeability and impermeability are all tested according to GB/T23445-2009 type II 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 examples below, unless otherwise specified, 100g is represented per "part" or per "part by weight".

Example 1

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

The method for preparing the waterproof paint 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 cooled 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, performing a second reaction, cooling to room temperature, and removing the acetone in an evaporation kettle to obtain a mixture V;

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

In S1, the fourth contact is performed 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 using amount and weight ratio of the organotin, the polyethylene glycol and the trimethylolpropane are 1:30:3, a step of;

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

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

in S4, 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 to the water to the nonionic emulsifier is 20:20:1.

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

carrying out second contact on the mixture I, a defoaming agent, a dispersing agent, a wetting agent, a film forming auxiliary agent and a thickening agent in a dispersing machine to obtain a mixture II;

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

(3) Preparing a coating: the weight ratio of the liquid agent to the powder is 1:1.6, and obtaining the double-component polyurethane waterproof paint which is marked as P1.

Example 2

This example uses a formulation and method similar to example 1 except that a water-resistant coating was prepared: the preparation conditions are changed, and the formula for preparing the aqueous polyurethane dispersion is different, so that the aqueous polyurethane dispersion is obtained and is marked as a dispersion II; a water-resistant coating was prepared, designated P2, see in particular Table 1.

Example 3

This example uses a formulation and method similar to example 1 except that a water-resistant coating was prepared: the formulations for preparing the liquid and the powder are different.

Obtaining an aqueous polyurethane dispersion, designated as dispersion III; a water-resistant coating was prepared, designated P3, see in particular Table 1.

Example 4

This example uses a formulation and method similar to example 1 except that a water-resistant coating was prepared: a commercially available aqueous polyurethane dispersion (available from Wanhua chemical group Co., ltd., trade mark 8355) was used as dispersion IV to replace the aqueous polyurethane dispersion prepared in the present invention; a water-resistant coating was prepared, designated P4, see in particular Table 1.

Example 5

This example uses a formulation and method similar to example 1 except that a water-resistant coating was prepared: when the liquid is prepared, the coupling agent III is used for replacing the coupling agent I.

Obtaining an aqueous polyurethane dispersion, designated as dispersion V; a water-resistant coating was prepared, designated P5, see in particular Table 1.

Comparative example 1

This example uses a formulation and method similar to example 1 except that a water-resistant coating was prepared: when preparing the powder, 150 parts by weight of mineral powder I is used, and 150 parts by weight of cement is added simultaneously.

Obtaining an aqueous polyurethane dispersion, designated as dispersion VI; a water-resistant coating was prepared, designated DP1, see in particular 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 barrier property according to GBT23445-2009 type II standard, and specific test results are shown in table 2.

TABLE 1

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Table 1 continuous table

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TABLE 2

From the results, the bi-component water-based polyurethane waterproof paint 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 in detail above, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, a number of simple variants of the technical solution of the invention are possible, including combinations of the individual technical features in any other suitable way, which simple variants and combinations should likewise be regarded as being disclosed by the invention, all falling within the scope of protection of the invention.

Claims

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

in the component B, the average particle size of the mineral powder is 7-20 mu m;

in the component B, the silicate cement is at least one of early-strength silicate cements with the strength of PO32.5R-PO42.5R grades;

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

the aqueous polyurethane dispersion is prepared by a method comprising the following steps:

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

The dispersing agent is at least one of an ammonium salt dispersing agent and a sodium salt dispersing agent; and/or

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

The film forming auxiliary agent is at least one of ester compounds and ethylene glycol monopropyl ether; and/or

The preservative is a kathon preservative; and/or

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

The coupling agent is at least one selected from gamma- (2, 3-glycidoxy) propyl trimethoxy silane, r-amino propyl triethoxy silane and methyl trimethoxy silane; and/or

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

3. The composition according to claim 1, wherein in the B component, the quartz sand has an average particle diameter of 106 to 149 μm; and/or

The filler is at least one selected from talcum powder and heavy calcium with average particle size of 30-60 mu m; and/or

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

The cellulose ether is at least one of low-viscosity cellulose ether with viscosity of 2000-4000 mPa.s measured by 1wt% aqueous solution at 21-25 ℃; and/or

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

4. A composition according to any one of claims 1 to 3, wherein in component a, the defoamer is a silicone defoamer; the dispersing agent is an ammonium salt dispersing agent; the coupling agent is gamma- (2, 3-glycidoxy) 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 composition according to any one of claims 1 to 3, wherein in S1 the organotin, the polyethylene glycol, the trimethylolpropane are used in a weight ratio of 1:25-50:2-5; and/or

The organic tin is at least one selected from dimethyl tin dichloride and dioctyltin oxide; and/or

In S1, the conditions of the fourth contact at least satisfy: under 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 to the toluene diisocyanate to the diphenylmethane diisocyanate is 1:4-7:4-7; and/or

In S2, the conditions of the first reaction at least satisfy: the process is carried out under the condition of stirring, the temperature is 70-110 ℃, the rotating speed is 1100-1300r/min, and the time is 1-3h; and/or

In S3, the weight ratio of the mixture IV to the acetone to the butanediol is 20-25:2-5:1, a step of; and/or

In S3, the conditions of the second reaction at least satisfy: the process is carried out under the condition of stirring, the temperature is 70-80 ℃, the rotating speed is 1300-1600r/min, and the time is 2-3h; and/or

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

In S4, the conditions for dispersion at least satisfy: the stirring is carried out under the condition that the temperature is 70-80 ℃ and the rotating speed is 11000-13000r/min for 1-3h; and/or

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

6. A process for preparing a two-component polyurethane waterproofing paint using the components of the composition according to any one of claims 1 to 4, comprising:

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

7. The method of claim 6, wherein in step (1), the first contacting conditions at least satisfy: the stirring is carried out under the condition of stirring, the rotating speed is 400-700r/min, and the time is 5-25min; and/or

In step (1), the conditions of the second contact at least satisfy: the stirring is carried out under the condition of stirring, the rotating speed is 800-1000r/min, and the time is 5-25min; and/or

In step (1), the condition of said mixture I satisfies at least: the stirring is carried out under the condition of stirring, the rotating speed is 500-1000r/min, and the time is 2-3min; and/or

In step (2), the conditions of the third contact at least satisfy: the stirring is carried out under the condition of stirring, the rotating speed is 400-700r/min, and the time is 10-15min; and/or

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

8. A two-component polyurethane waterproof coating prepared by the method of claim 6 or 7.

9. Use of the two-component polyurethane waterproof coating according to claim 8 in waterproof materials.