阅读说明：本技术 单组分聚氨酯防水涂料及其制备方法 (Single-component polyurethane waterproof coating and preparation method thereof ) 是由 吴海洋 何进 于 2021-07-12 设计创作，主要内容包括：本申请公开了一种单组分聚氨酯防水涂料及其制备方法,单组分聚氨酯防水涂料的主原料按重量份计包括：聚醚多元醇,5份～30份；遥爪聚合物,10份～30份；二异氰酸酯,5.0份～7.7份；其中,聚醚多元醇与遥爪聚合物的重量比X:Y为1:(1～6)。本申请通过利用遥爪聚合物改性单组分聚氨酯防水涂料,极大提升了聚氨酯涂料的粘接性能,经长期泡水后其与混凝土的粘接强度保持率依然较高,解决了现有的涂料在长期泡水后与混凝土粘接强度保持率较低的问题。(The application discloses a single-component polyurethane waterproof coating and a preparation method thereof, wherein the main raw materials of the single-component polyurethane waterproof coating comprise the following components in parts by weight: 5-30 parts of polyether polyol; 10-30 parts of a telechelic polymer; diisocyanate, 5.0-7.7 parts; wherein the weight ratio X to Y of the polyether polyol to the telechelic polymer is 1 (1-6). According to the application, the telechelic polymer modified single-component polyurethane waterproof coating is utilized, so that the bonding performance of the polyurethane coating is greatly improved, the bonding strength retention rate of the coating and concrete after long-term soaking is still high, and the problem that the bonding strength retention rate of the existing coating and concrete after long-term soaking is low is solved.)

1. The single-component polyurethane waterproof coating is characterized in that main raw materials comprise polyether polyol, telechelic polymer and diisocyanate, wherein the weight ratio X: Y of the polyether polyol to the telechelic polymer is 1 (1-6).

2. The one-component polyurethane waterproof coating as claimed in claim 1, wherein the main raw materials comprise, in parts by weight:

5-30 parts of polyether polyol;

10-30 parts of the telechelic polymer;

5.0 to 7.7 portions of diisocyanate.

3. The one-component polyurethane waterproof coating as claimed in claim 1, wherein the main raw material further comprises, in parts by weight:

10-18 parts of plasticizer;

30-45 parts of pigment and filler;

0.1 to 0.2 portion of catalyst;

1.1 to 3.0 portions of latent curing agent.

4. The one-part polyurethane waterproofing coating according to claim 1 wherein the telechelic polymer comprises at least one of hydroxyl-terminated polybutadiene and hydroxyl-terminated polybutadiene acrylonitrile.

5. The one-part polyurethane waterproof coating material according to any one of claims 1 to 4, wherein the polyether polyol includes at least one of polyoxypropylene glycol, polypropylene carbonate glycol and polytetrahydrofuran glycol.

6. The one-part polyurethane waterproof coating material according to any one of claims 1 to 4, wherein the diisocyanate includes at least one of toluene diisocyanate, diphenylmethane diisocyanate, 4' -dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate.

7. A preparation method of a single-component polyurethane waterproof coating is characterized by comprising the following steps:

under the vacuum condition, polyether polyol, a telechelic polymer, a plasticizer and pigment and filler are mixed and stirred uniformly to obtain first slurry;

adding diisocyanate, a latent curing agent and a catalyst into the first slurry, and reacting for a preset time to obtain the single-component polyurethane waterproof coating.

8. The method of claim 7, wherein mixing and stirring the polyether polyol, the telechelic polymer, the plasticizer and the pigment and filler under vacuum to obtain the first slurry comprises:

and stirring and heating polyether polyol, telechelic polymer, plasticizer and pigment and filler to 100-120 ℃ under the condition that the vacuum degree is-0.09 MPa to-0.1 MPa, and dehydrating for 2-3 h to obtain the first slurry.

9. The method of claim 7, wherein the step of adding diisocyanate, a latent curing agent and a catalyst to the first slurry and reacting for a predetermined time to obtain the one-component polyurethane waterproof coating comprises:

cooling the first slurry to 70-80 ℃, adding diisocyanate, heating to 75-85 ℃, and stirring for reaction for 2-3 h;

cooling to 70-80 ℃, adding the latent curing agent, and stirring for 30-50 min;

cooling to 50-60 ℃, adding a catalyst, and stirring for 20-30 min;

cooling to below 60 deg.C, introducing nitrogen for protection, and discharging.

Technical Field

The application relates to the technical field of waterproof coatings, in particular to a single-component polyurethane waterproof coating and a preparation method thereof.

Background

The single-component polyurethane waterproof coating has the characteristics of excellent overall waterproof effect, excellent mechanical property, good low-temperature flexibility, convenience in use and the like, and can be widely used in the field of building waterproofing as a novel waterproof coating. However, the coating material sometimes has to be soaked in water for a long time during use, which causes deterioration of the adhesive strength between the coating material and concrete, and causes a low retention rate of the adhesive strength, thereby greatly affecting the engineering quality.

Disclosure of Invention

In view of this, the application provides a single-component polyurethane waterproof coating and a preparation method thereof, which can ensure that the retention rate of the bonding strength of the coating with concrete after long-term water soaking is still high.

The first aspect of the embodiment of the application provides a single-component polyurethane waterproof coating, the main raw materials of the waterproof coating comprise polyether polyol, telechelic polymer and diisocyanate, and the weight ratio X: Y of the polyether polyol to the telechelic polymer is 1 (1-6).

Further, the waterproof coating comprises the following main raw materials in parts by weight: 5-30 parts of polyether polyol; 10-30 parts of a telechelic polymer; diisocyanate, 5.0 to 7.7 portions.

Further, the main raw materials of the waterproof coating comprise, by weight: 10-18 parts of plasticizer; 30-45 parts of pigment and filler; 0.1 to 0.2 portion of catalyst; 1.1 to 3.0 portions of latent curing agent.

Further, the telechelic polymer includes at least one of hydroxyl terminated polybutadiene and hydroxyl terminated polybutadiene acrylonitrile.

Further, the polyether polyol includes at least one of polyoxypropylene glycol, polypropylene carbonate glycol and polytetrahydrofuran glycol.

Further, the diisocyanate includes at least one of toluene diisocyanate, diphenylmethane diisocyanate, 4' -dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate.

In a second aspect of the embodiments of the present application, there is provided a method for preparing a one-component polyurethane waterproof coating, including the steps of:

under the vacuum condition, polyether polyol, a telechelic polymer, a plasticizer and pigment and filler are mixed and stirred uniformly to obtain first slurry;

adding diisocyanate, a latent curing agent and a catalyst into the first slurry, and reacting for a preset time to obtain the single-component polyurethane waterproof coating.

Further, the step of uniformly mixing and stirring the polyether polyol, the telechelic polymer, the plasticizer and the pigment and filler under the vacuum condition to obtain a first slurry comprises the following steps:

under the condition that the vacuum degree is-0.09 MPa to-0.1 MPa, the polyether polyol, the telechelic polymer, the plasticizer and the pigment and filler are stirred, heated to 100 ℃ to 120 ℃, and dehydrated for 2h to 3h to obtain first slurry.

Further, adding diisocyanate, a latent curing agent and a catalyst into the first slurry, and reacting for a preset time to obtain the single-component polyurethane waterproof coating, wherein the single-component polyurethane waterproof coating comprises the following components:

cooling the first slurry to 70-80 ℃, adding diisocyanate, heating to 75-85 ℃, and stirring for reaction for 2-3 h;

cooling to 70-80 ℃, adding the latent curing agent, and stirring for 30-50 min;

cooling to 50-60 ℃, adding a catalyst, and stirring for 20-30 min;

cooling to below 60 deg.C, introducing nitrogen for protection, and discharging.

Compared with the prior art, the embodiment of the application has the following beneficial effects:

according to the embodiment of the application, the bonding strength retention rate of the prepared modified polyurethane coating with concrete is still high after long-term water soaking by utilizing the telechelic polymer modified single-component polyurethane waterproof coating, and the bonding strength retention rate of the modified polyurethane coating with concrete after 28 days of water soaking can reach more than 80%, so that the problems that the bonding strength of the traditional polyurethane waterproof coating with concrete is poor after long-term water soaking, and the engineering quality is influenced are greatly improved.

Detailed Description

In order to make the application purpose, technical solution and beneficial technical effects of the present application clearer, the present application is further described in detail with reference to the following embodiments. It should be understood that the embodiments described in this specification are only for the purpose of explaining the present application and are not intended to limit the present application.

For the sake of brevity, only some numerical ranges are explicitly disclosed herein. However, any lower limit may be combined with any upper limit to form ranges not explicitly recited; and any lower limit may be combined with any other lower limit to form a range not explicitly recited, and similarly any upper limit may be combined with any other upper limit to form a range not explicitly recited. Also, although not explicitly recited, each point or individual value between endpoints of a range is encompassed within the range. Thus, each point or individual value can form a range not explicitly recited as its own lower or upper limit in combination with any other point or individual value or in combination with other lower or upper limits.

In the description herein, it is to be noted that, unless otherwise specified, "above" and "below" are inclusive, and "a plurality" of "one or more" means two or more.

The above summary of the present application is not intended to describe each disclosed embodiment or every implementation of the present application. The following description more particularly exemplifies illustrative embodiments. At various points throughout this application, guidance is provided through a list of embodiments that can be used in various combinations. In each instance, the list is merely a representative group and should not be construed as exhaustive.

The embodiment of the application provides a single-component polyurethane waterproof coating and a preparation method thereof.

The first aspect of the embodiment of the application provides a single-component polyurethane waterproof coating, the main raw materials of the waterproof coating comprise polyether polyol, telechelic polymer and diisocyanate, and the weight ratio X: Y of the polyether polyol to the telechelic polymer is 1 (1-6).

In some embodiments, the main raw materials of the waterproof coating comprise, by weight: 5-30 parts of polyether polyol; 10-30 parts of a telechelic polymer; diisocyanate, 5.0 to 7.7 portions.

In some embodiments, the main raw materials of the waterproof coating further include, by weight: 10-18 parts of plasticizer; 30-45 parts of pigment and filler; 0.1 to 0.2 portion of catalyst; 1.1 to 3.0 portions of latent curing agent.

In the research process, the applicant finds that the bonding strength of the traditional single-component polyurethane waterproof coating and concrete is poor after long-term water soaking, the bonding strength retention rate is low, and particularly the bonding strength retention rate with the concrete after 28 days of water soaking is usually below 60 percent and even below 50 percent. The applicant aims to overcome the defects in the coating and modifies the single-component polyurethane waterproof coating.

According to the embodiment of the application, the bonding strength retention rate of the prepared modified polyurethane coating with concrete is still high after long-term water soaking by utilizing the telechelic polymer modified single-component polyurethane waterproof coating, and the bonding strength retention rate of the modified polyurethane coating with concrete after 28 days of water soaking can reach more than 80%, so that the problems that the bonding strength of the traditional polyurethane waterproof coating with concrete is poor after long-term water soaking, and the engineering quality is influenced are greatly improved.

In some embodiments, the telechelic polymer may be selected from: at least one of hydroxyl-terminated polybutadiene and hydroxyl-terminated polybutadiene acrylonitrile. The telechelic polymer can be used for modifying the single-component polyurethane waterproof coating through means of chemical grafting, crosslinking, modification and the like, so that the retention rate of the bonding strength between the coating and concrete is improved.

In some embodiments, the polyether polyol may be selected from: at least one of polyoxypropylene diol, polypropylene carbonate diol and polytetrahydrofuran diol.

In some embodiments, the diisocyanate may be selected from: at least one of toluene diisocyanate, diphenylmethane diisocyanate, 4' -dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, and isophorone diisocyanate.

In some embodiments, the plasticizer may be selected from: at least one of trioctyl phosphate, acetyl tributyl citrate and chlorinated paraffin plasticizer.

In some embodiments, the pigment filler may be selected from at least one of titanium dioxide and heavy calcium carbonate powder.

In some embodiments, the catalyst may be selected from at least one of dibutyltin dilaurate, stannous octoate, and lead isooctanoate.

In some embodiments, the latent curing agent may be selected from at least one of a modified oxazolidine and an aldimine.

In a second aspect of the embodiments of the present application, there is provided a method for preparing a one-component polyurethane waterproof coating, including the steps of:

s01, under the vacuum condition, mixing and stirring polyether polyol, a telechelic polymer, a plasticizer and pigment and filler uniformly to obtain first slurry;

and S02, adding diisocyanate, a latent curing agent and a catalyst into the first slurry, and reacting for a preset time to obtain the single-component polyurethane waterproof coating.

In step S01, the polyether polyol, the telechelic polymer, the plasticizer and the pigment and filler can be stirred and heated to 100-120 ℃ under the condition that the vacuum degree is-0.09 MPa to-0.1 MPa, and the mixture is dehydrated for 2-3 hours to obtain the first slurry.

In some embodiments, the reaction in step S01 may be performed in a reaction vessel.

In step S02, the first slurry can be cooled to 70-80 ℃, diisocyanate is added, then the temperature is raised to 75-85 ℃, and the stirring reaction is carried out for 2-3 h; then cooling to 70-80 ℃, adding the latent curing agent, and stirring for 30-50 min; then continuously cooling to 50-60 ℃, adding a catalyst, and stirring for 20-30 min; and finally, cooling to below 60 ℃, filling nitrogen for protection, and discharging to obtain the single-component polyurethane waterproof coating.

According to the preparation method of the single-component polyurethane waterproof coating, various components contained in the coating are mixed according to the sequence, so that the process condition is controllable, the prepared polyurethane waterproof coating is smooth in film forming surface, free of bubbles, excellent in adhesive property, and high in adhesive strength retention rate with concrete after long-time water soaking.

Examples

The present disclosure is more particularly described in the following examples that are intended as illustrative only, since various modifications and changes within the scope of the present disclosure will be apparent to those skilled in the art. Unless otherwise indicated, all parts, percentages, and ratios reported in the following examples are on a weight basis, and all reagents used in the examples are commercially available or synthesized according to conventional methods and can be used directly without further treatment, and the equipment used in the examples is commercially available.

Example 1

A single-component polyurethane waterproof coating comprises the following raw materials in parts by weight: 15 parts of polypropylene oxide glycol; 15 parts of hydroxyl-terminated polybutadiene; 6.9 parts of diphenylmethane diisocyanate; 16 parts of chlorinated paraffin; 42.5 parts of coarse whiting powder; 2 parts of titanium dioxide; 0.1 part of dibutyltin dilaurate; 2.5 parts of modified oxazolidine latent curing agent.

Example 2

A single-component polyurethane waterproof coating comprises the following raw materials in parts by weight: 10 parts of polypropylene oxide glycol; 20 parts of hydroxyl-terminated polybutadiene; 6.9 parts of diphenylmethane diisocyanate; 16 parts of chlorinated paraffin; 42.5 parts of coarse whiting powder; 2 parts of titanium dioxide; 0.1 part of dibutyltin dilaurate; 2.5 parts of modified oxazolidine latent curing agent.

Example 3

A single-component polyurethane waterproof coating comprises the following raw materials in parts by weight: 7.5 parts of polypropylene oxide glycol; 22.5 parts of hydroxyl-terminated polybutadiene; 6.9 parts of diphenylmethane diisocyanate; 16 parts of chlorinated paraffin; 42.5 parts of coarse whiting powder; 2 parts of titanium dioxide; 0.1 part of dibutyltin dilaurate; 2.5 parts of modified oxazolidine latent curing agent.

Example 4

A single-component polyurethane waterproof coating comprises the following raw materials in parts by weight: 15 parts of polypropylene oxide glycol; 15 parts of hydroxyl-terminated polybutadiene acrylonitrile; 6.9 parts of diphenylmethane diisocyanate; 16 parts of chlorinated paraffin; 42.5 parts of coarse whiting powder; 2 parts of titanium dioxide; 0.1 part of dibutyltin dilaurate; 2.5 parts of modified oxazolidine latent curing agent.

Example 5

A single-component polyurethane waterproof coating comprises the following raw materials in parts by weight: 10 parts of polypropylene oxide glycol; 20 parts of hydroxyl-terminated polybutadiene acrylonitrile; 6.9 parts of diphenylmethane diisocyanate; 16 parts of chlorinated paraffin; 42.5 parts of coarse whiting powder; 2 parts of titanium dioxide; 0.1 part of dibutyltin dilaurate; 2.5 parts of modified oxazolidine latent curing agent.

Example 6

A single-component polyurethane waterproof coating comprises the following raw materials in parts by weight: 7.5 parts of polypropylene oxide glycol; 22.5 parts of hydroxyl-terminated polybutadiene acrylonitrile; 6.9 parts of diphenylmethane diisocyanate; 16 parts of chlorinated paraffin; 42.5 parts of coarse whiting powder; 2 parts of titanium dioxide; 0.1 part of dibutyltin dilaurate; 2.5 parts of modified oxazolidine latent curing agent.

Example 7

A single-component polyurethane waterproof coating comprises the following raw materials in parts by weight: polytetrahydrofuran diol, 15 parts; 15 parts of hydroxyl-terminated polybutadiene; 4.4 parts of 4,4' -dicyclohexylmethane diisocyanate; 2 parts of isophorone diisocyanate; 16 parts of trioctyl phosphate; 42.5 parts of coarse whiting powder; 2 parts of titanium dioxide; 0.1 part of lead isooctanoate; 3 parts of aldimine latent curing agent.

Example 8

A single-component polyurethane waterproof coating comprises the following raw materials in parts by weight: 10 parts of polytetrahydrofuran diol; 20 parts of hydroxyl-terminated polybutadiene; 4.4 parts of 4,4' -dicyclohexylmethane diisocyanate; 2 parts of isophorone diisocyanate; 16 parts of trioctyl phosphate; 42.5 parts of coarse whiting powder; 2 parts of titanium dioxide; 0.1 part of lead isooctanoate; 3 parts of aldimine latent curing agent.

Example 9

A single-component polyurethane waterproof coating comprises the following raw materials in parts by weight: polytetrahydrofuran diol, 7.5 parts; 22.5 parts of hydroxyl-terminated polybutadiene; 4.4 parts of 4,4' -dicyclohexylmethane diisocyanate; 2 parts of isophorone diisocyanate; 16 parts of trioctyl phosphate; 42.5 parts of coarse whiting powder; 2 parts of titanium dioxide; 0.1 part of lead isooctanoate; 3 parts of aldimine latent curing agent.

Example 10

A single-component polyurethane waterproof coating comprises the following raw materials in parts by weight: polytetrahydrofuran diol, 15 parts; 15 parts of hydroxyl-terminated polybutadiene acrylonitrile; 4.4 parts of 4,4' -dicyclohexylmethane diisocyanate; 2 parts of isophorone diisocyanate; 16 parts of trioctyl phosphate; 42.5 parts of coarse whiting powder; 2 parts of titanium dioxide; 0.1 part of lead isooctanoate; 3 parts of aldimine latent curing agent.

Example 11

A single-component polyurethane waterproof coating comprises the following raw materials in parts by weight: 10 parts of polytetrahydrofuran diol; 20 parts of hydroxyl-terminated polybutadiene acrylonitrile; 4.4 parts of 4,4' -dicyclohexylmethane diisocyanate; 2 parts of isophorone diisocyanate; 16 parts of trioctyl phosphate; 42.5 parts of coarse whiting powder; 2 parts of titanium dioxide; 0.1 part of lead isooctanoate; 3 parts of aldimine latent curing agent.

Example 12

A single-component polyurethane waterproof coating comprises the following raw materials in parts by weight: polytetrahydrofuran diol, 7.5 parts; 22.5 parts of hydroxyl-terminated polybutadiene acrylonitrile; 4.4 parts of 4,4' -dicyclohexylmethane diisocyanate; 2 parts of isophorone diisocyanate; 16 parts of trioctyl phosphate; 42.5 parts of coarse whiting powder; 2 parts of titanium dioxide; 0.1 part of lead isooctanoate; 3 parts of aldimine latent curing agent.

Example 13

A single-component polyurethane waterproof coating comprises the following raw materials in parts by weight: 15 parts of polypropylene carbonate glycol; 15 parts of hydroxyl-terminated polybutadiene; 6.3 parts of hexamethylene diisocyanate; 16 parts of acetyl tributyl citrate; 43 parts of coarse whiting powder; 2 parts of titanium dioxide; 0.2 part of stannous octoate; 2.5 parts of modified oxazolidine latent curing agent.

Example 14

A single-component polyurethane waterproof coating comprises the following raw materials in parts by weight: 10 parts of polypropylene carbonate glycol; 20 parts of hydroxyl-terminated polybutadiene; 6.3 parts of hexamethylene diisocyanate; 16 parts of acetyl tributyl citrate; 43 parts of coarse whiting powder; 2 parts of titanium dioxide; 0.2 part of stannous octoate; 2.5 parts of modified oxazolidine latent curing agent.

Example 15

A single-component polyurethane waterproof coating comprises the following raw materials in parts by weight: 7.5 parts of polypropylene carbonate glycol; 22.5 parts of hydroxyl-terminated polybutadiene; 6.3 parts of hexamethylene diisocyanate; 16 parts of acetyl tributyl citrate; 43 parts of coarse whiting powder; 2 parts of titanium dioxide; 0.2 part of stannous octoate; 2.5 parts of modified oxazolidine latent curing agent.

Example 16

A single-component polyurethane waterproof coating comprises the following raw materials in parts by weight: 15 parts of polypropylene carbonate glycol; 15 parts of hydroxyl-terminated polybutadiene acrylonitrile; 6.3 parts of hexamethylene diisocyanate; 16 parts of acetyl tributyl citrate; 43 parts of coarse whiting powder; 2 parts of titanium dioxide; 0.2 part of stannous octoate; 2.5 parts of modified oxazolidine latent curing agent.

Example 17

A single-component polyurethane waterproof coating comprises the following raw materials in parts by weight: 10 parts of polypropylene carbonate glycol; 20 parts of hydroxyl-terminated polybutadiene acrylonitrile; 6.3 parts of hexamethylene diisocyanate; 16 parts of acetyl tributyl citrate; 43 parts of coarse whiting powder; 2 parts of titanium dioxide; 0.2 part of stannous octoate; 2.5 parts of modified oxazolidine latent curing agent.

Example 18

A single-component polyurethane waterproof coating comprises the following raw materials in parts by weight: 7.5 parts of polypropylene carbonate glycol; 22.5 parts of hydroxyl-terminated polybutadiene acrylonitrile; 6.3 parts of hexamethylene diisocyanate; 16 parts of acetyl tributyl citrate; 43 parts of coarse whiting powder; 2 parts of titanium dioxide; 0.2 part of stannous octoate; 2.5 parts of modified oxazolidine latent curing agent.

Comparative example 1

A traditional single-component polyurethane waterproof coating comprises the following raw materials in parts by weight: polyoxypropylene diol, 27.4 parts; 6.5 parts of toluene diisocyanate; 15 parts of chlorinated paraffin; 45 parts of coarse whiting powder; 2 parts of titanium dioxide; 0.1 part of dibutyltin dilaurate; 4 parts of oxazolidine latent curing agent.

The raw materials of examples 1-18 above and comparative example 1 are shown in table 1 below in parts by weight, where the raw material of comparative example 1 does not include a telechelic polymer.

TABLE 1 raw material parts by weight tables of examples 1 to 18 and comparative example 1

The preparation method of the single-component polyurethane waterproof coating in the above embodiments 1 to 18 is as follows:

under the condition that the vacuum degree is-0.09 MPa to-0.1 MPa, uniformly dispersing polyether polyol, telechelic polymer, plasticizer and pigment and filler, stirring and heating to 120 ℃, and dehydrating for 3 hours to obtain first slurry;

cooling the first slurry to 80 ℃, adding diisocyanate, heating to 85 ℃, and stirring for reaction for 3 hours;

cooling to 80 deg.C, adding latent curing agent, and stirring for 30 min;

cooling to 60 deg.C, adding catalyst, and stirring for 20 min;

cooling to below 60 deg.C, introducing nitrogen for protection, and discharging.

The preparation method of comparative example 1 is similar to that of example 1 except that telechelic polymer is not included in the raw materials of the reaction, unlike example 1.

Test section

After the single-component polyurethane waterproof coatings in the embodiments 1 to 18 and the traditional single-component polyurethane waterproof coating in the comparative example 1 are bonded with concrete, water soaking tests are performed for different times, and the retention rate of the bonding strength between the concrete after water soaking is shown in the following table 1:

table 1 test table for retention rate of bonding strength between single-component polyurethane waterproof coating and concrete after long-time soaking in water

Examples

X:Y

Retention rate

Initial

Soaking water 7d

Soaking water 14d

Soaking water 21d

Soaking water 28d

Comparative example 1

—

Retention ratio%

100％

70.1％

65.6％

63.0％

61.7％

Example 1

1:1

Retention ratio%

100％

73.2％

70.0％

68.8％

68.1％

Example 2

1:2

Retention ratio%

100％

77.0％

73.9％

72.0％

72.0％

Example 3

1:3

Retention ratio%

100％

80.2％

77.8％

74.1％

73.5％

Example 4

1:1

Retention ratio%

100％

85.9％

79.9％

75.2％

73.1％

Example 5

1:2

Retention ratio%

100％

87.8％

83.5％

79.8％

78.0％

Example 6

1:3

Retention ratio%

100％

89.0％

87.2％

81.7％

80.5％

Example 7

1:1

Retention ratio%

100％

84.3％

82.6％

81.4％

79.9％

Example 8

1:2

Retention ratio%

100％

88.1％

86.9％

83.9％

82.6％

Example 9

1:3

Retention ratio%

100％

89.4％

87.5％

84.4％

83.1％

Example 10

1:1

Retention ratio%

100％

86.1％

84.8％

82.3％

79.7％

Example 11

1:2

Retention ratio%

100％

90.9％

86.9％

85.6％

83.0％

Example 12

1:3

Retention ratio%

100％

91.2％

87.1％

85.7％

83.7％

Example 13

1:1

Retention ratio%

100％

85.4％

83.3％

81.9％

81.1％

Example 14

1:2

Retention ratio%

100％

87.3％

86.8％

83.6％

82.9％

Example 15

1:3

Retention ratio%

100％

88.8％

87.1％

84.6％

82.7％

Example 16

1:1

Retention ratio%

100％

86.5％

83.9％

82.6％

81.7％

Example 17

1:2

Retention ratio%

100％

90.2％

87.7％

85.9％

83.2％

Example 18

1:3

Retention ratio%

100％

90.8％

88.3％

86.1％

83.9％

Comparative analysis of examples 1 to 18 and comparative example 1 shows that the retention rate of the bonding strength between the polyurethane waterproof coating and the concrete is reduced to different degrees after the polyurethane waterproof coating is soaked in water for 28 days; compared with examples 1-18, the bonding strength retention rate of the telechelic polymer modified single-component polyurethane waterproof coating to concrete is lower than that of examples 1-18, so that the bonding strength of the telechelic polymer modified single-component polyurethane waterproof coating to concrete can be improved.

In examples 1 to 18, when the weight ratio of the polyether polyol to the telechelic polymer is not more than 1:1, the retention ratio of the bonding strength between the telechelic polymer-modified one-component polyurethane waterproof coating and the concrete after soaking in water for 28 days can be 80% or more, specifically:

when the weight ratio of polytetrahydrofuran glycol to hydroxyl-terminated polybutadiene is less than or equal to 1:1, the bonding strength retention rate of the telechelic polymer modified single-component polyurethane waterproof coating and concrete after soaking in water for 28 days can meet 80% or above;

when the weight ratio of polytetrahydrofuran diol to hydroxyl-terminated polybutadiene acrylonitrile is less than or equal to 1:1, the bonding strength retention rate of the telechelic polymer modified single-component polyurethane waterproof coating and concrete after soaking in water for 28 days can meet 80% or above;

when the weight ratio of the poly (propylene carbonate) glycol to the hydroxyl-terminated polybutadiene is less than or equal to 1:1, the bonding strength retention rate of the telechelic polymer modified single-component polyurethane waterproof coating and concrete after soaking in water for 28 days can meet 80% or more;

when the weight ratio of the poly (propylene carbonate) glycol to the hydroxyl-terminated polybutadiene acrylonitrile is less than or equal to 1:1, the bonding strength retention rate of the telechelic polymer modified single-component polyurethane waterproof coating and concrete after soaking in water for 28 days can meet 80% or more;

when the weight ratio of the polyoxypropylene glycol to the hydroxyl-terminated polybutadiene acrylonitrile is 1:3, the bonding strength retention rate of the telechelic polymer modified single-component polyurethane waterproof coating and concrete after soaking in water for 28 days can meet 80% or above.

In addition, the embodiment of the application also includes experiments of the telechelic polymer modified polyurethane waterproof coating similar to the above embodiments 1 to 18, in which the weight ratio of the polyether polyol to the telechelic polymer is set to be 1:4, 1:5 and 1:6, and the single-component polyurethane waterproof coating obtained by the experiments is also subjected to the long-time soaking test like the embodiments 1 to 18, and the retention rate of the bonding strength between the single-component polyurethane waterproof coating and the concrete after 28 days of soaking can reach 80% or more.

By combining the embodiments, the retention rate of the bonding strength of the single-component polyurethane waterproof coating of the embodiment of the application with concrete after long-term water soaking is still high, and the retention rate of the bonding strength of the single-component polyurethane waterproof coating with concrete after 28 days of water soaking can reach more than 80%, so that the problem that the bonding strength of the traditional polyurethane waterproof coating with concrete is poor after long-term water soaking, and the engineering quality is influenced is greatly solved.

While the invention has been described with reference to specific embodiments, the scope of the invention is not limited thereto, and those skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.