CN113845802A

CN113845802A - Waterproof coating composition, waterproof coating, preparation method and application thereof

Info

Publication number: CN113845802A
Application number: CN202111205558.XA
Authority: CN
Inventors: 刘青青; 吴伟
Original assignee: Foshan Keshun Building Material Co ltd
Current assignee: Foshan Keshun Building Material Co ltd
Priority date: 2021-10-15
Filing date: 2021-10-15
Publication date: 2021-12-28
Anticipated expiration: 2041-10-15
Also published as: CN113845802B

Abstract

The invention relates to the field of building waterproof materials, and discloses a waterproof coating composition, a waterproof coating, and a preparation method and application thereof. The composition contains the following components which are stored in a mixing way or independently: polymer emulsion, silicate solution, filler, quartz sand, thickening agent, preservative, defoaming agent, water and inorganic color paste; the polymer emulsion is styrene-acrylic emulsion with the glass transition temperature of 20-30 ℃ and the solid content of 47-48 wt%; the silicate solution is at least one selected from potassium silicate solution and sodium silicate solution. The waterproof coating prepared from the waterproof coating composition provided by the invention has high bonding strength and low paint film shrinkage.

Description

Waterproof coating composition, waterproof coating, preparation method and application thereof

Technical Field

The invention relates to the field of building waterproof materials, in particular to a waterproof coating composition, a waterproof coating and a preparation method and application thereof.

Background

Buildings such as houses are usually decorated with tiles such as glazed tiles and vitrified tiles. However, the water absorption of the ceramic tiles is low, and the capillary porosity of the tile surface is low, so that the common cement is difficult to penetrate into the capillary pores to form mechanical anchoring force, and the tiles fall off due to low bonding force.

Currently, tile backsizes are commonly used to enhance the interfacial bond strength between cement and tile. The ceramic tile back glue is high molecular polymer emulsion, wherein long chain molecules contained in the ceramic tile back glue can permeate pores of a ceramic tile base layer to form tension; and the tile gum has good elasticity, can resist the vibration generated by temperature change and miniature deformation of a building, and improves the bonding force of the tile.

However, the tile back glue is an organic water-based polymer emulsion, has poor affinity with inorganic cement, and is easy to age and damage after a long time. Moreover, the emulsion has high moisture content, and the shrinkage rate of a paint film is high along with the volatilization of moisture in the film forming process of the paint film; the emulsion and the cement do not react chemically, and the bonding force is insufficient, so that bricks are easy to fall off.

CN111073402A discloses a green environment-friendly high-adhesion building primer and a preparation method thereof, wherein the primer comprises the following components: polymer emulsion, potassium silicate solution, pH regulator, freeze-thaw stabilizer, dispersant, wetting agent, defoaming agent, pigment, thickener, film forming aid, substrate wetting agent and water. Although the prior art improves the alkali return resistance of the primer, the base material is reinforced, and the bonding strength between the base material and the primer is improved. However, the product in the prior art has low solid content, large shrinkage degree of a paint film, unsuitability for bonding between interfaces, thin viscosity and easy sagging.

Therefore, there is a need to provide a new tile backsize.

Disclosure of Invention

The invention aims to solve the problems that the tile is easy to fall off due to low bonding strength of the tile back glue and the cement interface and high shrinkage rate in a film forming process of a paint film in the prior art.

The inventor finds in research that the styrene-acrylic emulsion in the styrene-acrylic emulsion-silicate organic-inorganic composite coating has strong permeability to the low-water-absorption ceramic tile and can permeate into capillary holes and micro crack holes of the ceramic tile to form mechanical anchoring force, so that the bonding strength of the ceramic tile and a cement interface is improved; simultaneous addition of silicate and Ca in cement²⁺Calcium silicate gel substance is generated by reaction, and the ceramic tile and the cement can be effectively improvedThe bonding strength of the interface; and the quartz sand can offset the shrinkage stress of a paint film so as to reduce the brick falling risk, so the scheme of the invention is formed.

In order to achieve the above object, a first aspect of the present invention provides a waterproof coating composition comprising two or more of the following components stored in admixture or independently:

polymer emulsion, silicate solution, filler, quartz sand, thickening agent, preservative, defoaming agent, water and inorganic color paste;

the polymer emulsion is styrene-acrylic emulsion with the glass transition temperature of 20-30 ℃ and the solid content of 47-48 wt%;

the silicate solution is at least one of potassium silicate solution and sodium silicate solution; the pH value of the silicate solution is 12.0-13.0, and the solid content is 24-36 wt%;

in the composition, the content of the polymer emulsion is 550-650 parts by weight, the content of the silicate solution is 95-105 parts by weight, the content of the filler is 10-15 parts by weight, the content of the quartz sand is 180-220 parts by weight, the content of the thickener is 0.2-0.4 part by weight, the content of the preservative is 1-2 parts by weight, the content of the defoamer is 1-2 parts by weight, the content of the water is 80-90 parts by weight, and the content of the inorganic color paste is 3-5 parts by weight.

A second aspect of the present invention provides a method for producing a waterproof coating material, comprising mixing the components of the waterproof coating material composition described in the first aspect; the step of mixing the components comprises:

(1) dispersing the polymer emulsion to obtain polymer emulsion I;

(2) carrying out first mixing on the polymer emulsion I and the component A to obtain a first mixture; the component A contains water, a thickening agent, a defoaming agent and a preservative;

(3) carrying out second mixing on the first mixture and the component B to obtain a second mixture; the component B contains filler and quartz sand;

(4) thirdly mixing the second mixture with the component C to obtain a third mixture; the component C contains silicate solution, the pH value of the silicate solution is 12.0-13.0, and the solid content is 24-36 wt%;

(5) carrying out fourth mixing on the third mixture and a component D to obtain the waterproof coating; the component D contains inorganic color paste.

A third aspect of the present invention provides a waterproof coating material obtained by the method described in the foregoing second aspect.

A fourth aspect of the invention provides a use of the waterproof coating described in the third aspect in tile backsize.

The invention adopts a system of compounding the polymer benzo emulsion and the silicate solution, and is assisted by the filler, the quartz sand, the thickening agent, the preservative and other auxiliary agents, thereby providing the composition with good processing performance.

When applied, the waterproof coating provided by the invention has the advantages of immediate brushing and immediate pasting, no need of airing and simple construction.

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.

In the present invention, the water content in the waterproof coating composition does not include water that may be contained in the polymer emulsion, the silicate solution, and the inorganic color paste.

As described above, the first aspect of the present invention provides a waterproof coating composition containing two or more of the following components stored in admixture or independently:

Preferably, the silicate solution is a combination of a potassium silicate solution and a sodium silicate solution.

According to a preferred embodiment, the sodium silicate solution and the potassium silicate solution are used in a weight ratio of 1: 3-4. The inventors of the present invention found that, with this preferred embodiment, the obtained waterproof coating material has better water resistance of the paint film and higher adhesive strength.

According to another preferred embodiment, the solids content of the potassium silicate solution and the sodium silicate solution is each independently from 24 to 36 wt%, and the modulus of the potassium silicate solution and the sodium silicate solution is each independently from 2.8 to 3.3.

Preferably, the filler has an average particle diameter of 15 to 40 μm.

Preferably, the filler is selected from at least one of calcined kaolin, ground calcium carbonate.

Preferably, the average particle size of the silica sand is 150-180 μm. The inventors of the present invention found that, in this preferable case, the obtained waterproof coating material has a lower paint film shrinkage ratio.

Preferably, the thickener is at least one selected from low-viscosity cellulose ether and polycarboxylic acid alkali swelling thickener. Illustratively, the thickener may be hydroxyethyl cellulose ether, polycarboxylic acid.

Preferably, the preservative is selected from at least one of isothiazolinone preservatives. Illustratively, the preservative may be a cason preservative.

Preferably, the defoaming agent is at least one selected from mineral oil type defoaming agents and silicone type defoaming agents. Illustratively, the anti-foaming agent may be a mineral oil type anti-foaming agent available from feiko trade ltd, Jiangmen.

Preferably, the inorganic color paste is selected from at least one of iron-based color pastes with strong alkali resistance. Illustratively, the inorganic color paste may be iron oxide red.

The method for preparing the aforementioned waterproof coating material is not particularly limited in the present invention, and those skilled in the art can select it according to the technical means known in the art. However, the present invention provides a preferred embodiment for obtaining a waterproof coating material having higher adhesive strength and lower shrinkage of paint film. As described above, the second aspect of the present invention provides a method for producing a waterproof coating material, which comprises mixing the components of the waterproof coating material composition described in the aforementioned first aspect; the step of mixing the components comprises:

(1) dispersing the polymer emulsion to obtain polymer emulsion I;

The amount and kind of each component involved in the second aspect of the present invention are the same as the content and kind of the corresponding component described in the first aspect of the present invention, and are not described herein again, and those skilled in the art should not be construed as limiting the present invention.

Preferably, in step (1), the conditions of the dispersion treatment at least satisfy: stirring is carried out at the rotating speed of 600-800rpm for 2-3min at the temperature of 20-25 ℃.

Preferably, in step (2), the first mixing condition at least satisfies: stirring is carried out at the rotation speed of 1000-1200rpm for 3-5min at the temperature of 20-25 ℃.

Preferably, in step (3), the second mixing at least satisfies: stirring is carried out at the rotating speed of 1500-1700rpm for 20-25min at the temperature of 20-25 ℃.

Preferably, in step (4), the third mixing condition at least satisfies: stirring is carried out at the rotation speed of 1200-1300rpm for 5-15min at the temperature of 20-25 ℃.

It should be noted that the third mixing mode is not particularly limited by the present invention, and those skilled in the art can select the third mixing mode according to the known technical means in the field, and the following description of the present invention exemplarily provides a preferred embodiment, and those skilled in the art should not be construed as limiting the present invention.

Preferably, in step (5), the fourth mixing condition at least satisfies: stirring is carried out at the rotation speed of 1200-1300rpm for 3-4min at the temperature of 20-25 ℃.

As previously mentioned, a third aspect of the present invention provides a waterproof coating material prepared by the method described in the foregoing second aspect.

As mentioned above, a fourth aspect of the present invention provides a use of the waterproof coating described in the third aspect in tile backsize.

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

Unless otherwise specified, the weight part in the present invention means 10 g.

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

Polymer emulsion:

styrene-acrylic emulsion I: no. 1103, glass transition temperature: 25 ℃, solid content: 47 wt% from Jiangmen Jinqiao New materials Co.

Styrene-acrylic emulsion II: no. 3130P, glass transition temperature: 22 ℃, solid content: 48 wt% from Jiangmen Jinqiao New materials Co.

Styrene-acrylic emulsion III: 300L, glass transition temperature: 10 ℃, solid content: 47 wt.% of a commercially available commercial product from Bade Rich chemical technology, Inc., Zhongshan.

Styrene-acrylic emulsion IV: trade mark 1105, glass transition temperature: 25 ℃, solid content: 44 wt% from Jiangmen Jinqiao New materials Co.

Silicate solution:

potassium silicate solution I: solid content: 24 wt%, modulus 2.8, pH 12.5, from Xiamen Pei Teng materials science and technology Limited.

Potassium silicate solution II: solid content: 26 wt%, modulus 2.8, pH 13.2, from Xiamen Pei Teng materials science and technology Limited.

Sodium silicate solution: solid content: 36 wt%, modulus 3.3, pH 13.0, available from Yougui refractory Co., Jiashan county, Ltd.

Lithium silicate solution: solid content: 24 wt%, modulus 2.8, pH 13.0, purchased from Xiamen rattan materials science and technology Limited.

Filling: calcined kaolin, having an average particle size of 25 μm, was purchased from sincheng kaolin products, inc.

Quartz sand:

quartz sand I: the average particle size is 160 mu m, and the product is purchased from Rugao as chemical Co.

And (2) quartz sand II: the average particle size is 180 mu m, and the product is purchased from Rugao, such as chemical Co.

And (3) quartz sand III: the average particle size is 200 mu m, and the product is purchased from Rugao, such as chemical Co.

Thickening agent:

thickener I: hydroxyethyl cellulose ether, available from Aohan, Inc., Oriental, Beijing.

Thickener II: polycarboxylic acids, designation T-615, are available from Acksonobel specialty Chemicals (Shanghai) Inc.

Preservative: kathon preservative, purchased from blue sub chemical Co., Ltd, of Foshan City.

Defoaming agent:

defoaming agent I: silicone emulsions, reference numeral 105509, were available from Guangzhou Kokunke chemical Co., Ltd.

And (3) defoaming agent II: mineral oil, reference 105107, available from Feichao trade, Inc., Jiangmen.

Water: deionized water.

Inorganic color paste: number plate

Series, available from lucent.

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:

(1) stirring the styrene-acrylic emulsion I at the rotating speed of 800rpm for 3min at room temperature to obtain styrene-acrylic emulsion I-1;

(2) stirring the styrene-acrylic emulsion I-1, water, a thickening agent, a defoaming agent and a preservative in the component A at the rotating speed of 1000rpm for 5min at room temperature to obtain a first mixture;

(3) stirring the first mixture, the filler in the component B and the quartz sand at the rotating speed of 1500rpm for 20min at room temperature to obtain a second mixture;

(4) adding silicate solution into the second mixture at room temperature at the speed of 10kg/min, and stirring at the rotating speed of 1200rpm for 8min to obtain a third mixture;

(5) and (3) stirring the third mixture and the inorganic color paste in the component D at the rotation speed of 1200rpm for 4min at room temperature to obtain the waterproof coating T1.

Example 2 was carried out using the same procedure as in example 1, except that the formulation of the waterproof coating composition and the process parameters were different, without specific mention, to prepare a waterproof coating T2, see in Table 1.

Example 3

This example prepared a water-resistant coating using a formulation and method similar to example 1, except that: a waterproof coating material T3 was prepared using only a sodium silicate solution and using the sodium silicate solution in this example as the sum of the amounts of the potassium silicate solution I and the sodium silicate solution in example 1, see table 1 for details.

Example 4

This example prepared a water-resistant coating using a formulation and method similar to example 1, except that: replacing quartz sand I with quartz sand III by equal weight to prepare the waterproof coating T4, which is shown in Table 1.

Comparative example 1

This comparative example prepared a water-resistant coating using a formulation and method similar to example 1, except that: the equal weight of the styrene-acrylic emulsion I is replaced by the styrene-acrylic emulsion III to prepare the waterproof coating DT1, which is shown in Table 1.

Comparative example 2

This comparative example prepared a water-resistant coating using a formulation and method similar to example 1, except that: the equal weight of the styrene-acrylic emulsion I is replaced by the styrene-acrylic emulsion IV to prepare the waterproof coating DT2, which is shown in Table 1.

Comparative example 3

This comparative example prepared a water-resistant coating using a formulation and method similar to example 1, except that: the equal weight of potassium silicate solution I was replaced with lithium silicate solution to prepare waterproof coating DT3, see table 1 for details.

Comparative example 4

This comparative example prepared a water-resistant coating using a formulation and method similar to example 1, except that: the same weight of potassium silicate solution I was replaced with potassium silicate solution II to prepare waterproof paint DT4, see Table 1 for details.

Test example 1

The waterproof coatings prepared in the examples and the comparative examples are tested according to the standard JCT 547-.

Wherein, the paint film expansion and contraction rate is tested by adopting the following method: the uniform thickness of the wet film of the paint film is 1.5mm, the dry film of the paint film is obtained after the wet film of the paint film is placed for 12 hours in a standard state (23 ℃, and the relative humidity is 50%), the thickness of the dry film of the paint film is tested, and the percentage of the thickness difference between the thickness of the wet film of the paint film and the thickness of the dry film of the paint film and the thickness of the wet film of the paint film is the shrinkage rate.

TABLE 1

TABLE 1

TABLE 2

As can be seen from the results in Table 2, the waterproof coating prepared by using the waterproof coating composition provided by the invention has higher bonding strength and lower paint film shrinkage.

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 waterproof coating composition is characterized by comprising the following components which are stored in a mixing way or independently:

2. The composition of claim 1, wherein the silicate solution is a combination of a potassium silicate solution and a sodium silicate solution; and/or the presence of a gas in the gas,

the solid contents of the potassium silicate solution and the sodium silicate solution are respectively and independently 24-36 wt%, and the modulus of the potassium silicate solution and the sodium silicate solution is respectively and independently 2.8-3.3.

3. The composition of claim 1 or 2, wherein the filler has an average particle size of 15-40 μ ι η; and/or the presence of a gas in the gas,

the filler is selected from at least one of calcined kaolin and ground calcium carbonate; and/or the presence of a gas in the gas,

the average particle size of the quartz sand is 150-180 mu m.

4. The composition of any one of claims 1-3, wherein the thickener is selected from at least one of low viscosity cellulose ethers, polycarboxylic acid alkali swelling thickeners; and/or the presence of a gas in the gas,

the preservative is at least one selected from isothiazolinone preservatives; and/or the presence of a gas in the gas,

the defoaming agent is at least one of mineral oil defoaming agent and silicone defoaming agent; and/or the presence of a gas in the gas,

the inorganic color paste is selected from at least one of iron-based color pastes with strong alkali resistance.

5. A method for producing a waterproof coating material, characterized by comprising mixing the components of the waterproof coating material composition according to any one of claims 1 to 4; the step of mixing the components comprises:

(1) dispersing the polymer emulsion to obtain polymer emulsion I;

6. The method according to claim 5, wherein in step (1), the condition of the dispersion treatment at least satisfies: stirring is carried out at the rotating speed of 600-800rpm for 2-3min and the temperature of 20-25 ℃; and/or the presence of a gas in the gas,

in step (2), the first mixing condition at least satisfies: stirring is carried out at the rotation speed of 1000-1200rpm for 3-5min at the temperature of 20-25 ℃.

7. The method of claim 5, wherein, in step (3), the second mixing at least satisfies: stirring is carried out at the rotating speed of 1500-1700rpm for 20-25min at the temperature of 20-25 ℃; and/or the presence of a gas in the gas,

in step (4), the third mixing condition at least satisfies: stirring is carried out at the rotation speed of 1200-1300rpm for 5-15min at the temperature of 20-25 ℃.

8. The method of claim 5, wherein in step (5), the fourth mixing condition at least satisfies: stirring is carried out at the rotation speed of 1200-1300rpm for 3-4min at the temperature of 20-25 ℃.

9. A water-repellent paint prepared by the method according to any one of claims 5 to 8.

10. Use of the water-repellent coating according to claim 9 in tile backsize.