Acrylate emulsion for polymer cement waterproof coating, raw material composition thereof, preparation method therefor, and use thereof

Abstract

Disclosed in the present invention are an acrylate emulsion for a polymer cement waterproof coating, a raw material composition thereof, a preparation method therefor, and a use thereof. The raw material composition comprises the following components in parts by weight: 3-4.5 parts of sodium dodecyl diphenyl ether disulfonate, 1.5-2.5 parts of acrylamide, 2-4 parts of fatty alcohol polyoxyethylene ether, 2-4 parts of polyethylene glycol dimethacrylate, 1-2 parts of acrylic acid, 0.5-1 part of titanium triisostearoylisopropoxide, 40-60 parts of acrylate, 0.5-1 part of sodium persulfate, 50-60 parts of deionized water, and 0.1-0.3 parts of a 10% sodium hydroxide solution. The acrylate emulsion prepared by the present invention has excellent performance and good dispersibility, and a polymer cement waterproof coating prepared by using the emulsion of the present invention has lower viscosity and better workability.

Description

An acrylic emulsion for polymer cement waterproof coatings, its raw material composition, preparation method, and application.

[0001] This application claims priority to Chinese patent application 2025110414772, filed on January 10, 2025. The entire contents of the aforementioned Chinese patent application are incorporated herein by reference. Technical Field

[0002] This invention belongs to the field of acrylic emulsion technology, specifically relating to an acrylic emulsion for polymer cement waterproof coatings, its raw material composition, preparation method, and application. Background Technology

[0003] Waterproof coatings are an important type of building coating, primarily functioning to prevent the penetration, leakage, and corrosion of reinforced concrete structures by moisture and other liquids or gases. Polymer cement (JS) waterproof coatings, as a type of two-component water-based waterproof coating, are formulated with polymer emulsions and cement as the main raw materials, along with other additives and fillers. Therefore, they combine the advantages of both polymers and cement, possessing both the excellent extensibility and waterproof properties of polymer emulsions and the high strength and strong adhesion to damp substrates of hydraulic cementitious materials. Polymer waterproof coatings possess the hydraulic properties and high impact resistance of cement, while also exhibiting the flexibility, high elasticity, and waterproof properties of polymer films. They are widely used in basements, balconies, kitchens, swimming pools, bathrooms, and underground projects, significantly improving the performance of buildings and the living experience.

[0004] In existing technologies, polymer cement (JS) waterproof coatings typically use styrene-acrylic emulsions as binders. Among the styrene-acrylic emulsion binders used in polymer cement waterproof coatings, as described in patent CN111004347B, N-allyl (meth)acrylamide with double bonds at both ends of its molecular structure is employed, which is extremely expensive. Other methods, such as those disclosed in patents CN106715491A, CN111356707A, CN112266439B, and CN113896841A, introduce large amounts of (meth)acrylate hydroxyalkyl esters. However, due to the limited hydrophilicity of these monomers, their dispersion characteristics for JS coating powder are relatively poor. Poorly dispersible emulsions result in higher viscosity after addition, leading to poor workability in the waterproof coating. Therefore, improving the dispersibility of the emulsion is crucial. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides an acrylic emulsion for polymer cement waterproof coatings, its raw material composition, preparation method, and application.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] In one aspect, the present invention provides a raw material composition for an acrylic emulsion used in polymer cement waterproof coatings, comprising the following components in parts by weight:

[0008] Sodium dodecyl diphenyl ether disulfonate 3-4.5 parts, acrylamide 1.5-2.5 parts, fatty alcohol polyoxyethylene ether 2-4 parts, polyethylene glycol dimethacrylate 2-4 parts, acrylic acid 1-2 parts, isopropyl trioleoyl oxytitanate 0.5-1 part, acrylate 40-60 parts, sodium persulfate 0.5-1 part, deionized water 50-60 parts, 10% sodium hydroxide solution 0.1-0.3 parts.

[0009] In some embodiments, the acrylate is at least one selected from methyl methacrylate, methyl acrylate, butyl acrylate, and 2-ethylhexyl acrylate.

[0010] In another aspect, the present invention provides a method for preparing an acrylic emulsion for polymer cement waterproof coatings, comprising at least:

[0011] (1) Sodium dodecyl diphenyl ether disulfonate, acrylamide, fatty alcohol polyoxyethylene ether, polyethylene glycol dimethacrylate, acrylic acid, isopropyl trioleoyl oxytitanate, acrylate, and deionized water are added to an emulsification vessel and stirred to emulsify, thus obtaining an emulsion.

[0012] (2) Add deionized water to the reactor, heat to 80-88°C, add 12% of the emulsion, and then add 12% of sodium persulfate to carry out the polymerization reaction;

[0013] (3) Add the remaining emulsion and the remaining sodium persulfate to the reaction vessel dropwise. After the addition is completed, keep it warm, cool it down, add 10% sodium hydroxide solution to neutralize it, filter it, and obtain the acrylate emulsion.

[0014] In step (1), the amount of deionized water used is 25 to 35 parts;

[0015] In step (2), the amount of deionized water used is 17 to 20 parts;

[0016] In step (2), the polymerization reaction takes 15 to 30 minutes.

[0017] In step (3), the dripping time is 3-4 hours;

[0018] In step (3), the heat preservation treatment time is 1 to 2 hours.

[0019] The sodium persulfate is added in the form of an aqueous solution, preferably dissolved in 5 to 8 parts of deionized water.

[0020] In a third aspect, the present invention also provides an acrylic emulsion for polymer cement waterproof coatings, which is prepared by the above-described method for preparing acrylic emulsions for polymer cement waterproof coatings.

[0021] In a fourth aspect, the present invention also provides the application of the above-mentioned acrylic emulsion for polymer cement waterproof coating in the preparation of polymer cement waterproof coating.

[0022] The reagents and raw materials used in this invention are all commercially available.

[0023] The positive and progressive effects of this invention are as follows:

[0024] (1) The acrylic emulsion of the present invention has excellent performance, and its conventional indicators are the same as or better than those of similar products on the market.

[0025] (2) The acrylic emulsion of the present invention has good dispersibility for cement powder. After mixing in the same proportion, the viscosity is lower than that of similar products on the market and the workability is better.

[0026] (3) In this invention, the acrylate emulsion uses both sodium dodecyl diphenyl ether disulfonate and fatty alcohol polyoxyethylene ether as emulsifiers to make the emulsion relatively stable. Simultaneously, the crosslinking monomers acrylic acid and acrylamide are used to increase the crosslinking density of the emulsion and improve the strength of the waterproof coating. Furthermore, the coupling agent isopropyltrioleoyl titanate is used to improve the product's water resistance; finally, polyethylene glycol dimethacrylate is used to improve both emulsification performance and the dispersibility of the emulsion with powder.

[0027] (4) The acrylic emulsion of the present invention does not contain harmful substances such as alkylphenol polyoxyethylene ether, and is highly efficient and environmentally friendly. Detailed Implementation

[0028] The present invention will now be described in detail with reference to embodiments, providing a clear and complete description of the technical solutions to facilitate understanding of the invention by those skilled in the art. The described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention. Furthermore, all raw materials mentioned below, unless otherwise specified, are commercially available products; and all process steps or preparation methods not mentioned in detail are process steps or preparation methods known to those skilled in the art.

[0029] Example 1

[0030] A method for preparing an acrylic emulsion for polymer cement waterproof coatings includes the following steps:

[0031] (1) Add 4 parts of sodium dodecyl diphenyl ether disulfonate (CAS, 7575-62-4); 2 parts of acrylamide; 3 parts of fatty alcohol polyoxyethylene ether (CAS, 68439-50-9); 3 parts of polyethylene glycol dimethacrylate (CAS, 25852-47-5); 1.5 parts of acrylic acid; 0.7 parts of isopropyl trioleoyl oxytitanate (CAS, 61417-49-0); 20 parts of methyl methacrylate; 15 parts of butyl acrylate; 10 parts of 2-ethylhexyl acrylate; and 30 parts of deionized water to an emulsifying tank, stir and emulsify to prepare an emulsion;

[0032] (2) Dissolve 0.7 parts of sodium persulfate in 6 parts of deionized water to prepare an initiator solution;

[0033] (3) Heat 20 parts of deionized water to 85°C, add 12% emulsion, and then add 12% initiator solution to start the polymerization reaction;

[0034] (4) After 20 minutes, the remaining emulsion and initiator solution were added dropwise to the reactor over a period of 4 hours. After the addition was completed, the mixture was kept warm for 1.5 hours, cooled down, and 0.2 parts of 10% sodium hydroxide solution were added to neutralize it. The mixture was then filtered to obtain the acrylate emulsion.

[0035] Example 2

[0036] A method for preparing an acrylic emulsion for polymer cement waterproof coatings includes the following steps:

[0037] (1) Add 4 parts of sodium dodecyl diphenyl ether disulfonate (CAS, 7575-62-4); 2.5 parts of acrylamide; 4 parts of fatty alcohol polyoxyethylene ether (CAS, 68439-50-9); 4 parts of polyethylene glycol dimethacrylate (CAS, 25852-47-5); 2 parts of acrylic acid; 1 part of isopropyl trioleoyl oxytitanate (CAS, 61417-49-0); 30 parts of methyl methacrylate; 2 parts of methyl acrylate; 13 parts of butyl acrylate; 15 parts of 2-ethylhexyl acrylate; and 32 parts of deionized water to an emulsification kettle, stir and emulsify to prepare an emulsion.

[0038] (2) Dissolve 0.9 parts of sodium persulfate in 8 parts of deionized water to prepare an initiator solution;

[0039] (3) Heat 20 parts of deionized water to 86°C, add 12% emulsion, and then add 12% initiator solution to start the polymerization reaction;

[0040] (4) After 15 minutes, the remaining emulsion and the remaining initiator solution were added dropwise to the reactor over a period of 4 hours. After the addition was completed, the mixture was kept warm for 2 hours, cooled down, and 0.3 parts of 10% sodium hydroxide solution were added to neutralize it. The mixture was then filtered to obtain the acrylate emulsion.

[0041] Example 3

[0042] A method for preparing an acrylic emulsion for polymer cement waterproof coatings includes the following steps:

[0043] (1) Add 3.3 parts of sodium dodecyl diphenyl ether disulfonate (CAS, 7575-62-4); 1.8 parts of acrylamide; 2.2 parts of fatty alcohol polyoxyethylene ether (CAS, 68439-50-9); 2.2 parts of polyethylene glycol dimethacrylate (CAS, 25852-47-5); 1.2 parts of acrylic acid; 0.6 parts of isopropyl trioleoyl oxytitanate (CAS, 61417-49-0); 18 parts of methyl methacrylate; 6 parts of methyl acrylate; 13 parts of butyl acrylate; 8 parts of 2-ethylhexyl acrylate; and 28 parts of deionized water to an emulsifying tank, stir and emulsify to prepare an emulsion.

[0044] (2) Dissolve 0.6 parts of sodium persulfate in 5.5 parts of deionized water to prepare an initiator solution;

[0045] (3) Heat 17.5 parts of deionized water to 82°C, add 12% emulsion, and then add 12% initiator solution to start the polymerization reaction;

[0046] (4) After 30 minutes, the remaining emulsion and initiator solution were added dropwise to the reactor over a period of 3 hours. After the addition was completed, the mixture was kept warm for 1 hour, cooled down, and 0.15 parts of 10% sodium hydroxide solution were added to neutralize it. The mixture was then filtered to obtain the acrylate emulsion.

[0047] The present invention also provides the following comparative examples.

[0048] Comparative Example 1

[0049] The only difference from Example 1 is that isopropyltrioleoyloxytitanate was not added.

[0050] Comparative Example 2

[0051] The only difference from Example 1 is that 0.7 parts of isopropyl trioleoyl oxytitanate titanate are replaced with 0.7 parts of isopropyl tris(dioctyl phosphate oxy)titanate (CAS, 65345-34-8).

[0052] Comparative Example 3

[0053] The only difference from Example 1 is that the amount of isopropyltrioleoyloxytitanate (CAS, 61417-49-0) is reduced from 0.7 parts to 0.3 parts.

[0054] Comparative Example 4

[0055] The only difference from Example 1 was that the amount of sodium dodecyl diphenyl ether disulfonate (CAS, 7575-62-4) was reduced from 4 parts to 2 parts. After synthesis, 40 parts of gel were obtained, which did not meet the production requirements.

[0056] Comparative Example 5

[0057] The only difference from Example 1 was that the amount of polyethylene glycol dimethacrylate (CAS, 25852-47-5) was reduced from 3 parts to 1.5 parts. After synthesis, the gel yielded 70 parts, which did not meet the production requirements.

[0058] Comparative Example 6

[0059] The product is purchased from the market; it is BLJ-6189 manufactured by Shanghai Baolijia Chemical Co., Ltd.

[0060] Product performance testing

[0061] 1. The emulsions of Examples 1-3 and Comparative Examples 1-6 were tested according to Type II of GB / T 23445-2009 standard. The specific physical and mechanical properties are shown in Table 1 and Table 2.

[0062] 2. Viscosity test: The emulsion was prepared according to the JS waterproof coating type II, with a liquid-to-powder ratio of 1:1.5 and ultra-fine powder as the powder. The viscosity was tested using a Brookfield DVIIPro viscometer with a #3 rotor at 30 rpm. After standing for 30 minutes, the viscosity was tested again. The results are shown in Table 3.

[0063] Table 1

[0064] Table 2

[0065] As can be seen from Tables 1 and 2, Examples 1-3 of the present invention all meet the Type II product standard in GB / T 23445-2009, and their performance is equivalent to or exceeds that of Baolijia Company's BLJ-6189 product. Comparative Examples 1-3, however, exhibit poor water resistance and alkali resistance, failing to meet the standards.

[0066] Table 3

[0067] From a construction perspective, a slurry viscosity of 3000–5000 cps is optimal; a viscosity exceeding 7000 cps makes construction impossible. Furthermore, the slurry viscosity will increase after standing. When preparing slurries using ultrafine powders, the viscosity is generally higher than that of conventional powders. During use, special dispersants are often required; otherwise, the viscosity will be too high, making construction impossible.

[0068] As can be seen from Table 3, the viscosity of Examples 1 to 3 of the present invention is lower than that of commercially available products. Therefore, it can be determined that the emulsion dispersibility of the present invention is better than that of BLJ-6189, and the dispersibility is better.

[0069] Finally, it should be noted that in this invention, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0070] Although this disclosure has been described above through specific embodiments, it should be understood that those skilled in the art can devise various modifications, improvements, or equivalents to this disclosure within the spirit and scope of the appended solutions. Such modifications, improvements, or equivalents should also be considered to be included within the scope of protection claimed in this disclosure.

Claims

1. A raw material composition for an acrylic emulsion used in polymer cement waterproof coatings, characterized in that, It comprises the following components in parts by weight: Sodium dodecyl diphenyl ether disulfonate 3-4.5 parts, acrylamide 1.5-2.5 parts, fatty alcohol polyoxyethylene ether 2-4 parts, polyethylene glycol dimethacrylate 2-4 parts, acrylic acid 1-2 parts, isopropyl trioleoyl oxytitanate 0.5-1 part, acrylate 40-60 parts, sodium persulfate 0.5-1 part, deionized water 50-60 parts, 10% sodium hydroxide solution 0.1-0.3 parts.

2. The raw material composition for the acrylic emulsion of polymer cement waterproof coating according to claim 1, characterized in that, The acrylate is at least one of methyl methacrylate, methyl acrylate, butyl acrylate, and 2-ethylhexyl acrylate.

3. A method for preparing an acrylic emulsion for polymer cement waterproof coatings, characterized in that, The raw materials for the acrylic emulsion used in polymer cement waterproof coatings include the raw material composition for the acrylic emulsion used in polymer cement waterproof coatings as described in any one of claims 1 to 2, and the method includes the following steps: (1) Sodium dodecyl diphenyl ether disulfonate, acrylamide, fatty alcohol polyoxyethylene ether, polyethylene glycol dimethacrylate, acrylic acid, isopropyl trioleoyl oxytitanate, acrylate, and deionized water are added to an emulsification vessel and stirred to emulsify, thus obtaining an emulsion. (2) Add deionized water to the reactor, heat to 80-88°C, add 12% of the emulsion, and then add 12% of sodium persulfate to carry out the polymerization reaction; (3) Add the remaining emulsion and the remaining sodium persulfate to the reaction vessel dropwise. After the addition is completed, keep it warm, cool it down, add 10% sodium hydroxide solution to neutralize it, filter it, and obtain the acrylate emulsion.

4. The method for preparing the acrylic emulsion for polymer cement waterproof coating according to claim 3, characterized in that, In step (1), the amount of deionized water used is 25 to 35 parts; 5. The method for preparing the acrylic emulsion for polymer cement waterproof coating according to claim 3, characterized in that, In step (2), the amount of deionized water used is 17 to 20 parts; And / or, in step (2), the polymerization reaction takes 15 to 30 minutes.

6. The method for preparing the acrylic emulsion for polymer cement waterproof coating according to claim 3, characterized in that, In step (3), the dripping time is 3-4 hours; And / or, in step (3), the heat preservation treatment time is 1 to 2 hours.

7. The method for preparing the acrylic emulsion for polymer cement waterproof coating according to claim 3, characterized in that, Sodium persulfate is added in the form of an aqueous solution, preferably dissolved in 5 to 8 parts of deionized water.

8. An acrylic emulsion for use in polymer cement waterproof coatings, characterized in that, It is prepared by the method for preparing acrylic emulsion for polymer cement waterproof coating as described in any one of claims 3 to 7.

9. The application of the acrylic emulsion for polymer cement waterproof coating according to claim 8 in the preparation of polymer cement waterproof coating.

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