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

Abstract

The invention discloses an acrylate emulsion for a polymer cement waterproof coating, a raw material composition of the acrylate emulsion and a preparation method and application of the acrylate emulsion, and the acrylate emulsion 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 and 1-2 parts of acrylic acid. The paint is prepared from the following components in parts by weight: 0.5-1 part of isopropyl trioleate acyloxy titanate, 40-60 parts of acrylate, 0.5-1 part of sodium persulfate, 50-60 parts of deionized water and 0.1-0.3 part of 10% sodium hydroxide solution. The prepared acrylate emulsion is excellent in performance and good in dispersity, and a polymer cement waterproof coating prepared from the emulsion is lower in viscosity and better in constructability.

Description

Technical Field

[0001] The invention belongs to the technical field of acrylic ester emulsions, and in particular relates to an acrylic ester emulsion for polymer cement waterproof coatings, a raw material composition thereof, and a preparation method and application thereof. Background Art

[0002] Building waterproof coating is an important building coating, and its main function is to prevent liquids or gases such as water from penetrating, leaking and corroding the reinforced concrete structure inside the building. As a type of two-component water-based waterproof coating, polymer cement (JS) waterproof coating is made of polymer emulsion and cement as the main raw materials, and other additives and fillers are added. Therefore, it has the advantages of both polymer and cement, that is, it has the excellent elongation and waterproofness of polymer emulsion, and the advantages of high strength and strong bonding ability with wet base of hydraulic cementitious materials. Polymer waterproof coating has the advantages of cement's hydraulic hardness and high impact resistance, and also has the characteristics of polymer coating film's flexibility, high elasticity and waterproofness. It is widely used in basements, balconies, kitchens, sinks, toilets and bathrooms, underground projects and other places. It greatly improves the performance of buildings and people's living experience.

[0003] In the prior art, polymer cement (JS) waterproof coatings usually use styrene acrylic emulsion as an adhesive. Among the styrene acrylic emulsion adhesives used in polymer cement waterproof coatings, as described in patent CN111004347B, N-allyl (meth) acrylamide with double bonds at both ends of the molecular structure is used, and its cost is extremely high; as disclosed in patents CN106715491A, CN111356707A, CN112266439B, and CN113896841A, a large amount of (meth) hydroxyalkyl acrylate is introduced, but due to the limited hydrophilicity of such monomers, its dispersion characteristics for JS coating powder are relatively general. After adding the emulsion with poor dispersibility, the viscosity will be relatively high. The waterproof coating has too high viscosity and poor construction performance. Therefore, it is very important to improve the dispersibility of the emulsion. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an acrylate emulsion for polymer cement waterproof coating, a raw material composition thereof, and a preparation method and application thereof.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] In one aspect, the present invention provides a raw material composition of an acrylic emulsion for a polymer cement waterproof coating, comprising the following components in parts by weight:

[0007] 3-4.5 parts of sodium dodecyl diphenyl oxide 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 isopropyl trioleate acyloxy titanate, 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 10% sodium hydroxide solution.

[0008] In some embodiments, the acrylate is at least one of methyl methacrylate, methyl acrylate, butyl acrylate, and 2-ethylhexyl acrylate.

[0009] In another aspect, the present invention provides a method for preparing an acrylic emulsion for a polymer cement waterproof coating, comprising at least:

[0010] (1) adding sodium dodecyl diphenyl ether disulfonate, acrylamide, fatty alcohol polyoxyethylene ether, polyethylene glycol dimethacrylate, acrylic acid, isopropyl trioleyl titanate, acrylate, and deionized water into an emulsifying kettle, stirring and emulsifying to obtain an emulsion;

[0011] (2) adding deionized water into the reaction kettle, raising the temperature to 80-88° C., adding 12% of the emulsion, and then adding 12% of sodium persulfate to carry out polymerization reaction;

[0012] (3) adding the remaining emulsion and the remaining sodium persulfate dropwise to the reaction kettle, and after the addition is completed, performing heat preservation treatment, cooling, adding 10% sodium hydroxide solution for neutralization, and filtering to obtain the acrylic ester emulsion.

[0013] In step (1), the amount of deionized water is 25 to 35 parts;

[0014] In step (2), the amount of deionized water used is 17 to 20 parts;

[0015] In step (2), the polymerization reaction time is 15 to 30 minutes.

[0016] In step (3), the dripping time is 3 to 4 hours;

[0017] In step (3), the heat preservation treatment time is 1 to 2 hours.

[0018] The sodium persulfate is added in the form of an aqueous solution. Preferably, the sodium persulfate is dissolved in 5 to 8 parts of deionized water.

[0019] The third aspect of the present invention also provides an acrylate emulsion for polymer cement waterproof coating, which is prepared by the above-mentioned preparation method of acrylate emulsion for polymer cement waterproof coating.

[0020] The fourth aspect of the present invention also provides a use of the above-mentioned acrylic emulsion for polymer cement waterproof coating in the preparation of polymer cement waterproof coating.

[0021] The reagents and raw materials used in the present invention are commercially available.

[0022] The positive and progressive effects of the present invention are:

[0023] (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.

[0024] (2) The acrylic emulsion of the present invention has good dispersibility in cement powder. After mixing in the same proportion, the viscosity is lower than that of similar products on the market, and the construction performance is better.

[0025] (3) The acrylic ester emulsion of the present invention uses two emulsifiers, sodium dodecyl diphenyl ether disulfonate and fatty alcohol polyoxyethylene ether, to make the emulsion relatively stable. At the same time, cross-linking monomers acrylic acid and acrylamide are used to increase the cross-linking density of the emulsion and improve the strength of the waterproof coating. In addition, a coupling agent, isopropyl trioleyl titanate, is used to improve the water resistance of the product; finally, polyethylene glycol dimethacrylate is used to improve the emulsification performance and the dispersibility of the emulsion to the powder.

[0026] (4) The acrylic emulsion of the present invention does not contain harmful substances such as alkylphenol polyoxyethylene ether, is highly efficient and environmentally friendly. DETAILED DESCRIPTION

[0027] The present invention is described in detail below in conjunction with the embodiments, and the technical scheme of the present invention is clearly and completely described to facilitate the understanding of the present invention by those skilled in the art. The described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. At the same time, the raw materials mentioned below that are not described in detail are all commercially available products; the process steps or preparation methods not mentioned in detail are process steps or preparation methods known to those skilled in the art.

[0028] Example 1

[0029] A method for preparing an acrylic emulsion for a polymer cement waterproof coating comprises the following steps:

[0030] (1) Add 4 parts of sodium dodecyl diphenyl oxide 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 trioleyl titanate (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 into an emulsifying kettle, stir and emulsify to prepare an emulsion;

[0031] (2) dissolving 0.7 parts of sodium persulfate in 6 parts of deionized water to prepare an initiator solution;

[0032] (3) 20 parts of deionized water were heated to 85°C, 12% of the emulsion was added, and then 12% of the initiator solution was added to start the polymerization reaction;

[0033] (4) After 20 minutes, the remaining emulsion and the remaining initiator solution were added dropwise to the reactor for 4 hours. After the addition was completed, the mixture was kept warm for 1.5 hours, cooled, and 0.2 parts of 10% sodium hydroxide solution was added. After neutralization, the mixture was filtered to obtain an acrylic emulsion.

[0034] Example 2

[0035] A method for preparing an acrylic emulsion for a polymer cement waterproof coating comprises the following steps:

[0036] (1) Add 4 parts of sodium dodecyl diphenyl oxide 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 trioleyl titanate (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 into an emulsifying kettle, stir and emulsify to prepare an emulsion;

[0037] (2) dissolving 0.9 parts of sodium persulfate in 8 parts of deionized water to prepare an initiator solution;

[0038] (3) 20 parts of deionized water were heated to 86°C, 12% of the emulsion was added, and then 12% of the initiator solution was added to start the polymerization reaction;

[0039] (4) After 15 minutes, the remaining emulsion and the remaining initiator solution were added dropwise to the reactor for 4 hours. After the addition was completed, the mixture was kept warm for 2 hours, cooled, and 0.3 parts of 10% sodium hydroxide solution was added. After neutralization, the mixture was filtered to obtain an acrylic emulsion.

[0040] Example 3

[0041] A method for preparing an acrylic emulsion for a polymer cement waterproof coating comprises the following steps:

[0042] (1) Add 3.3 parts of sodium dodecyl diphenyl oxide 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 trioleyl titanate (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 into an emulsifying kettle, stir and emulsify to prepare an emulsion;

[0043] (2) dissolving 0.6 parts of sodium persulfate in 5.5 parts of deionized water to prepare an initiator solution;

[0044] (3) 17.5 parts of deionized water were heated to 82° C., 12% of the emulsion was added, and then 12% of the initiator solution was added to start the polymerization reaction;

[0045] (4) After 30 minutes, the remaining emulsion and the remaining initiator solution were added dropwise to the reactor for 3 hours. After the addition was completed, the mixture was kept warm for 1 hour, cooled, and 0.15 parts of 10% sodium hydroxide solution was added. After neutralization, the mixture was filtered to obtain an acrylic emulsion.

[0046] The present invention also provides the following comparative examples.

[0047] Comparative Example 1

[0048] The only difference from Example 1 is that isopropyl trioleyl titanate is not added.

[0049] Comparative Example 2

[0050] The only difference from Example 1 is that 0.7 parts of isopropyl trioleyl titanate is replaced by 0.7 parts of isopropyl tri(dioctylphospho) titanate (CAS, 65345-34-8).

[0051] Comparative Example 3

[0052] The only difference from Example 1 is that the amount of isopropyl trioleyl titanate (CAS, 61417-49-0) is reduced from 0.7 parts to 0.3 parts.

[0053] Comparative Example 4

[0054] The only difference from Example 1 is that the amount of sodium dodecyl diphenyl ether disulfonate (CAS, 7575-62-4) is reduced from 4 parts to 2 parts. After synthesis, the gel is 40 parts, which does not meet the production conditions.

[0055] Comparative Example 5

[0056] The only difference from Example 1 is that the amount of polyethylene glycol dimethacrylate (CAS, 25852-47-5) is reduced from 3 parts to 1.5 parts. After synthesis, the gel is 70 parts, which does not meet the production conditions.

[0057] Comparative Example 6

[0058] Commercially available product, BLJ-6189 produced by Shanghai Baolijia Chemical Co., Ltd.

[0059] Product performance testing

[0060] 1. The emulsions of Examples 1 to 3 and Comparative Examples 1 to 6 were tested according to Type II in GB / T 23445-2009. The specific physical and mechanical indicators are shown in Tables 1 and 2.

[0061] 2. Viscosity test: Prepare the waterproof coating according to JS waterproof coating type II, with a liquid-to-powder ratio of 1:1.5 and ultrafine powder as the powder. Use DVIIPro viscometer from Brookfield, USA, with rotor 3 and a speed of 30 to test the viscosity. After standing for 30 minutes, test the viscosity again. The results are shown in Table 3.

[0062] Table 1

[0063]

[0064] Table 2

[0065]

[0066]

[0067] As can be seen from Table 1 and Table 2, Examples 1 to 3 of the present invention all meet the Type II product standard in GB / T 23445-2009, and have performances equal to or better than the BLJ-6189 product of Baolijia Company. Comparative Examples 1 to 3 have poor water resistance and alkali resistance and fail to meet the standards.

[0068] Table 3

[0069] Test items Example 1 Example 2 Example 3 BLJ-6189 Viscosity cps 3650 3850 3900 7250 Viscosity after 30min cps 3800 4000 4050 8600

[0070] From the construction point of view, the most suitable slurry viscosity is 3000-5000cps. If it exceeds 7000cps, it cannot be constructed. And after being placed, the viscosity of the slurry will increase. When ultrafine powder is used to prepare slurry, the viscosity is generally higher than that of conventional powder. During use, special dispersants are often required to be added, otherwise the viscosity will be too high and construction cannot be carried out.

[0071] It can be seen from Table 3 that the viscosities of Examples 1 to 3 of the present invention are all lower than those of commercially available products. Therefore, it can be judged that the dispersibility of the emulsion of the present invention is better than that of BLJ-6189.

[0072] Finally, it should be noted that in the present invention, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements that are not explicitly listed, or also includes elements that are inherent to such process, method, article or apparatus.

[0073] Although the present disclosure has been disclosed above through the description of the specific embodiments of the present disclosure, it should be understood that those skilled in the art can design various modifications, improvements or equivalents to the present disclosure within the spirit and scope of the attached scheme. These modifications, improvements or equivalents should also be considered to be included in the scope of protection claimed by the present disclosure.

Claims

1. A raw material composition of acrylic emulsion for polymer cement waterproof coating, characterized in that: It includes the following components in parts by weight: 3-4.5 parts of sodium dodecyl diphenyl oxide 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 isopropyl trioleate acyloxy titanate, 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 10% sodium hydroxide solution.

2. The raw material composition of acrylic emulsion for polymer cement waterproof coating according to claim 1, characterized in that: The acrylic acid ester 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 coating, characterized in that: The raw material of the acrylic ester emulsion for polymer cement waterproof coating comprises the raw material composition of the acrylic ester emulsion for polymer cement waterproof coating as claimed in any one of claims 1 to 2, and the method comprises the following steps: (1) adding sodium dodecyl diphenyl ether disulfonate, acrylamide, fatty alcohol polyoxyethylene ether, polyethylene glycol dimethacrylate, acrylic acid, isopropyl trioleyl titanate, acrylate, and deionized water into an emulsifying kettle, stirring and emulsifying to obtain an emulsion; (2) adding deionized water into the reaction kettle, raising the temperature to 80-88° C., adding 12% of the emulsion, and then adding 12% of sodium persulfate to carry out polymerization reaction; (3) adding the remaining emulsion and the remaining sodium persulfate dropwise to the reaction kettle, and after the addition is completed, performing heat preservation treatment, cooling, adding 10% sodium hydroxide solution for neutralization, and filtering to obtain the acrylic ester emulsion.

4. The method for preparing an acrylic emulsion for a 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 an acrylic emulsion for a 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 time is 15 to 30 minutes.

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

7. The method for preparing an 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, sodium persulfate is dissolved in 5 to 8 parts of deionized water.

8. An acrylic emulsion for polymer cement waterproof coating, characterized in that: The acrylic emulsion is prepared by the method for preparing the acrylic emulsion for polymer cement waterproof coating according to any one of claims 3 to 7.

9. Use 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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