Weather-resistant polymer cement waterproof coating and preparation method thereof

Abstract

The application discloses a weather-resistant polymer cement waterproof coating and a preparation method thereof. The weather-resistant polymer cement waterproof coating comprises an A component and a B component. The A component comprises the following components in parts by mass: 60-80 parts of a polymer emulsion, 0.5-1 part of a wet dispersing agent, 0.05-0.1 part of an antifoaming agent, 1-5.0 parts of an anti-settling agent, 0.5-1 part of an ultraviolet absorber and 1-2 parts of a leveling agent. The B component comprises the following components in parts by mass: 35-50 parts of cement, 10-15 parts of fly ash, 5-10 parts of calcium carbonate, 0.1-0.5 parts of a water reducing agent, 0.05-0.1 part of a thickening agent and 0.1-0.5 parts of titanium dioxide. The polymer emulsion comprises an organic fluorine modified styrene-acrylic emulsion and a fluorocarbon resin. The polymer cement waterproof coating provided by the application has excellent weather resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waterproof coating, in particular to a weather-resistant polymer cement waterproof coating and a preparation method thereof. BACKGROUND

[0002] Polymer cement waterproof coating, referred to as JS waterproof coating, J refers to polymer, S refers to cement, so JS is polymer cement waterproof coating. Polymer cement waterproof coating is a kind of organic liquid composed of polymer emulsion such as polyacrylate emulsion and ethylene-vinyl acetate copolymer emulsion and various additives, and inorganic powder composed of cement, quartz sand and various additives and inorganic fillers, which is made into a two-component water-based building waterproof coating through reasonable proportioning and compounding.

[0003] However, the waterproof coating used at present is prone to leakage within a short period of time, the material surface is separated, the weather resistance is poor, and it cannot be directly exposed to sunlight, and the service life is short.

[0004] Therefore, it is necessary to develop a polymer cement waterproof coating with good weather resistance. SUMMARY

[0005] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the first aspect of the present application provides a weather-resistant polymer cement waterproof coating, which can effectively improve the weather resistance.

[0006] The second aspect of the present application further provides a preparation method of the weather-resistant polymer cement waterproof coating.

[0007] The third aspect of the present application further provides an application of the weather-resistant polymer cement waterproof coating.

[0008] The weather-resistant polymer cement waterproof coating provided by the first aspect of the present application comprises A component and B component.

[0009] The polymer emulsion is 60-80 parts, the wet dispersing agent is 0.5-1 part, the defoaming agent is 0.05-0.1 part, the anti-settling agent is 1-5.0 parts, the ultraviolet absorber is 0.5-1 part, and the leveling agent is 1-2 parts.

[0010] The B component comprises, by mass fraction:

[0011] The cement is 35-50 parts, the fly ash is 10-15 parts, the calcium carbonate is 5-10 parts, the water reducing agent is 0.1-0.5 parts, the thickening agent is 0.05-0.1 parts, and the titanium dioxide is 0.1-0.5 parts.

[0012] The polymer emulsion comprises organic fluorine modified styrene-acrylic emulsion and fluorocarbon resin.

[0013] The weather-resistant polymer cement waterproof coating according to the embodiment of the present application has at least the following beneficial effects:

[0014] The polymer cement waterproof coating prepared by the polymer emulsion, the ultraviolet absorber, the titanium dioxide, the calcium carbonate and other components has excellent weather resistance, and can be used for waterproofing of outdoor buildings. This is because the polymer emulsion used in the present application includes the organic fluorine modified styrene-acrylic emulsion and the fluorocarbon resin, and the synergistic effect of the fluorocarbon resin and the organic fluorine modified styrene-acrylic emulsion can greatly improve the weather resistance of the coating.

[0015] According to some embodiments of the present application, the mass ratio of the fluorocarbon resin to the organic fluorine modified styrene-acrylic emulsion is 1:(2-4).

[0016] According to some embodiments of the present application, the fluorine content in the fluorocarbon resin is 10wt.%-30wt.%.

[0017] According to some embodiments of the present application, the raw materials for preparing the organic fluorine modified styrene-acrylic emulsion include styrene, butyl acrylate, acrylic acid and propylene trifluoroacetate. The organic fluorine modified styrene-acrylic emulsion is prepared by the following method:

[0018] The emulsifier, styrene, butyl acrylate, acrylic acid and propylene trifluoroacetate are mixed to obtain a mixed solution I; the initiator is added dropwise into the mixed solution I, and then the temperature is raised and the reaction is kept to obtain the product.

[0019] According to some embodiments of the present application, the ultraviolet absorber includes at least one of benzotriazole ultraviolet light absorber, 2,4-dihydroxybenzophenone, triazine ultraviolet light absorber or hindered amine ultraviolet light absorber.

[0020] According to some embodiments of the present application, the leveling agent is at least one of polydimethylsiloxane, polymethylalkylsiloxane, organically modified polysiloxane fluorine, modified acrylic acid or phosphate ester modified acrylic acid.

[0021] According to some embodiments of the present application, the thickening agent is selected from polyvinyl alcohol or methyl cellulose.

[0022] According to some embodiments of the present application, the wet dispersing agent is sodium hexametaphosphate.

[0023] According to some embodiments of the present application, the defoaming agent includes at least one of mineral oil defoaming agent, polyether defoaming agent, silicone defoaming agent, non-silicon defoaming agent or tributyl phosphate defoaming agent.

[0024] According to some embodiments of the present application, the titanium dioxide includes rutile titanium dioxide.

[0025] According to some embodiments of the present application, the at least one of the cement is at least one of Portland cement, Sulphoaluminate cement, Phosphate cement or Magnesium Sulphate cement.

[0026] According to some embodiments of the present application, the preparation method of the weather-resistant polymer cement waterproof coating comprises the following steps:

[0027] Mix and stir the polymer emulsion, wetting dispersant, defoaming agent, anti-settling agent, ultraviolet absorber, leveling agent, cement, fly ash, calcium carbonate, water reducing agent, thickening agent, titanium dioxide and water, and the weather-resistant polymer cement waterproof coating is obtained.

[0028] According to some embodiments of the present application, the stirring speed is 300-600 rpm.

[0029] According to some embodiments of the present application, the stirring time is 1-3 h.

[0030] The third aspect of the present application provides an application of the weather-resistant polymer cement waterproof coating in building materials.

[0031] Other features and advantages of the present application will be illustrated in the following description, and some will become apparent from the description, or will be understood by those skilled in the art through implementation of the present application. DETAILED DESCRIPTION

[0032] The following are specific embodiments of the present application, and the technical solutions of the present application are further described in conjunction with the embodiments, but the present application is not limited to these embodiments.

[0033] The reagents, methods and equipment used in the present application are conventional reagents, methods and equipment in the technical field, unless otherwise specified.

[0034] Some raw materials of the present application are as follows:

[0035] Fluorocarbon resin: JF-2X; Shanghai Dongluo Chemical Technology Co., Ltd.

[0036] Wetting dispersant: sodium hexametaphosphate, commercially available;

[0037] Thickening agent: methyl cellulose, commercially available;

[0038] Defoaming agent: silicone defoaming agent, commercially available;

[0039] Titanium dioxide: rutile titanium dioxide, commercially available;

[0040] Cement: 42.5 ordinary Portland cement, commercially available;

[0041] Ultraviolet absorber: 2,4-dihydroxybenzophenone, commercially available;

[0042] Leveling agent: polydimethylsiloxane, commercially available;

[0043] Water reducing agent: polycarboxylic acid water reducing agent, commercially available;

[0044] The organic fluorine-modified styrene-acrylic emulsion is prepared by the following method:

[0045] (1) Emulsify water (33.6%), sodium dodecyl sulfate (0.5%), OP-10 (0.5%), styrene (20%), butyl acrylate (25%), acrylic acid (10%), and propylene trifluoroacetate mixture (1.5%) into a pre-emulsion by strong stirring for 0.5 h;

[0046] (2) Dissolve potassium persulfate (0.4%) and sodium bicarbonate (0.1%) into the remaining water (8.4%) to form a mixed solution;

[0047] (3) In a four-necked flask equipped with a reflux condenser, a stirrer, and a pressure-equalizing funnel, add 1 / 5 of the pre-emulsion prepared in step (1), heat to 79°C, then add the mixed solution prepared in step (2), and stir to react. When the liquid in the reaction vessel changes from white to blue, indicating the start of polymerization, start dropping 2 / 5 of the pre-emulsion prepared in step (1). After the dropping is completed, add the remaining 2 / 5 of the pre-emulsion prepared in step (1) into the reactor. The total dropping time of the pre-emulsion is controlled at 180 min. After all the pre-emulsion is dropped, keep the temperature at 79°C for 59 min, then cool to 30°C, adjust the pH value to 8 with 25-28 wt% ammonia water, and filter the product.

[0048] Example 1

[0049] This example provides a weather-resistant polymer cement waterproof coating. The component amounts are shown in Table 1. The preparation method is as follows:

[0050] Mix and stir the polymer emulsion, wetting dispersant, defoaming agent, anti-settling agent, ultraviolet absorber, leveling agent, cement, fly ash, calcium carbonate, water reducing agent, thickening agent, titanium dioxide, and water in the proportions to obtain the product.

[0051] Examples 2-4

[0052] Examples 2-4 provide a series of weather-resistant polymer cement waterproof coatings. The preparation method is basically the same as that of Example 1. The component amounts are shown in Table 1.

[0053] Table 1 Examples 1-4 (parts by mass)

[0054]

[0055] Comparative Example 1

[0056] Comparative Example 1 provides a polymer cement waterproof coating, the preparation method and component amount of which are basically the same as those of Example 1, except that the organic fluorine modified styrene-acrylic emulsion is replaced with an equal amount of fluorocarbon resin.

[0057] Comparative Example 2

[0058] Comparative Example 2 provides a polymer cement waterproof coating, the preparation method and component amount of which are basically the same as those of Example 1, except that the organic fluorine modified styrene-acrylic emulsion is replaced with an equal amount of fluorocarbon resin.

[0059] Performance test

[0060] The polymer cement waterproof coatings prepared by Examples 1-4 and Comparative Examples 1-2 of the present application are subjected to aging resistance performance test, and the test method refers to GB / T14522-2008. The results are shown in Table 2:

[0061] Table 2 Examples 1-4 and Comparative Examples 1-2

[0062]

[0063]

[0064] As can be seen from the data in Table 2, the polymer cement waterproof coating prepared by the present application has excellent weather resistance.

[0065] The above is a detailed description of the present application in combination with the examples, but the present application is not limited to the above examples, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the purpose of the present application.

Claims

1. A weather resistant polymer cement waterproofing coating, characterized by, comprising a Group A component and a Group B component; the Group A component comprises, by mass fraction: a polymer emulsion 60-80 parts, a wet dispersing agent 0.5-1 part, an antifoaming agent 0.05-0.1 part, an anti-settling agent 1-5.0 parts, an ultraviolet light absorber 0.5-1 part, a leveling agent 1-2 parts; the Group B component comprises, by mass fraction: cement 35-50 parts, fly ash 10-15 parts, calcium carbonate 5-10 parts, a water reducing agent 0.1-0.5 parts, a thickening agent 0.05-0.1 parts, titanium dioxide 0.1-0.5 parts; the polymer emulsion comprises an organic fluorine-modified styrene-acrylic emulsion and a fluorocarbon resin; the mass ratio of the fluorocarbon resin to the organic fluorine-modified styrene-acrylic emulsion is 1:2; in the fluorocarbon resin, the fluorine content is 10 wt.%-30 wt.%; the raw materials for preparing the organic fluorine-modified styrene-acrylic emulsion include styrene, butyl acrylate, acrylic acid, and propylene trifluoroacetate.

2. The weather resistant polymer cement waterproofing coating according to claim 1, characterized in that, the organic fluorine-modified styrene-acrylic emulsion is prepared by the following method: mixing an emulsifier, styrene, butyl acrylate, acrylic acid, and propylene trifluoroacetate to obtain a mixed solution I; adding an initiator dropwise to the mixed solution I, and then heating and keeping the temperature to obtain the product.

3. The weather resistant polymer cement waterproofing coating according to claim 1, characterized in that, the ultraviolet light absorber comprises at least one of a benzotriazole ultraviolet light absorber, 2,4-dihydroxybenzophenone, a triazine ultraviolet light absorber, or a hindered amine ultraviolet light absorber.

4. The weather resistant polymer cement waterproofing coating according to claim 1, characterized in that, the leveling agent is at least one of polydimethylsiloxane, polymethylalkylsiloxane, or modified acrylic acid.

5. The weather resistant polymer cement waterproofing coating of claim 1, wherein, the thickening agent is selected from polyvinyl alcohol or methyl cellulose.

6. The method of claim 1 to 5, wherein the weatherable polymer-modified cementitious waterproofing coating is prepared by the steps of: a) mixing the components of the weatherable polymer-modified cementitious waterproofing coating; b) applying the weatherable polymer-modified cementitious waterproofing coating to a substrate; and c) curing the weatherable polymer-modified cementitious waterproofing coating. comprising the following steps: mixing and stirring the polymer emulsion, the wet dispersing agent, the antifoaming agent, the anti-settling agent, the ultraviolet light absorber, the leveling agent, the cement, the fly ash, the calcium carbonate, the water reducing agent, the thickening agent, the titanium dioxide, and the water to obtain the product.

7. Use of the weather-resistant polymer cement waterproof coating according to any one of claims 1-5 in building materials.

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