Polyacrylate sealant and preparation method thereof
Through the secondary polymerization of internal plasticizer and polyacrylate, the problem of insufficient flexibility and low temperature flexibility of polyacrylate sealant is solved, and the long-term stable performance of the sealant is improved.
Patent Information
- Application Number
- CN202510951103.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-10
- Publication Date
- 2025-08-26
AI Technical Summary
The existing polyacrylate sealants have weak flexibility, poor low temperature flexibility, and unstable overall performance, which is mainly due to the volatility and migration of external plasticizers, resulting in the lack of lasting plasticizers.
The internal plasticizer and polyacrylate are used to repolymerize under the action of multifunctional additive pull-off powder, so that the monomer of the internal plasticizer enters the polyacrylate macromolecular bond structure, reduces the glass transition temperature, improves flexibility and improves durability.
The flexibility and low temperature flexibility of polyacrylate sealant have been achieved, and the overall performance is stable for a long time and does not migrate or exudate due to time.
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Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of sealants, and in particular to a polyacrylate sealant and a preparation method thereof. Background Art
[0002] Sealant is used to seal joints in building structures and has gradually become a mainstream material. This material can be categorized into different types based on the base polymer, including silicone sealants, silyl-terminated polyether sealants, polysulfide sealants, polyacrylate sealants, and polyurethane sealants. Polyacrylate sealants are based on polyacrylate resins. Polyacrylate sealants are water-based products with excellent resistance to aging, cold, oil, and ozone. They are low-cost and primarily used for sealing joints in buildings.
[0003] In order to increase the flexibility of polyacrylate sealants, plasticizers need to be added to increase their plasticity. Currently, in the existing technology, external plasticizers are added during the production process. However, due to volatilization and migration of external plasticizers, the plasticizing effect is reduced, thereby weakening the performance of the sealant.
[0004] Therefore, the current polyacrylate sealants have the problems of poor flexibility at low temperatures, short-lasting flexibility, and unstable overall performance of the sealants. Summary of the Invention
[0005] Based on the problems that current polyacrylate sealants have weak flexibility and unstable overall performance of the sealants, the purpose of the present invention is to provide a polyacrylate sealant and a preparation method thereof, which not only improves flexibility but also enhances low-temperature flexibility and durability.
[0006] The present invention is achieved through the following technical solutions: In a first aspect, the present application provides a polyacrylate sealant, which includes, by weight, an appropriate amount of ammonia water as a pH regulator, 100 parts of a polyacrylate emulsion, 0.5 to 2.2 parts of a stretch powder, 9 to 12 parts of an internal plasticizer, 0.5 parts of a dispersant, 0.5 parts of a wetting agent, 120 parts of a filler, and 4 parts of a silane coupling agent.
[0007] The polyacrylate sealant of this formula is a secondary polymerization of polyacrylate with an internal plasticizer under the action of a multifunctional auxiliary agent, pulling powder, so that the monomer of the internal plasticizer enters the macromolecular bond structure of the polyacrylate, thereby lowering the glass transition temperature of the polyacrylate, improving its flexibility, and achieving a stable and long-lasting plasticization effect. It will not migrate or seep out over time, making the overall performance of the sealant stable over the long term.
[0008] In a specific embodiment, the NH3 content of the ammonia water is 25%.
[0009] The solid content of the polyacrylate emulsion is 59% to 61%.
[0010] In a specific embodiment, the pH value of the polyacrylate emulsion is 5-7.
[0011] In a specific embodiment, the internal plasticizer includes any one or more combinations of dimethyl maleate, dibutyl maleate, dioctyl maleate, liquid butadiene rubber, liquid polysulfide rubber, liquid polybutadiene rubber, and liquid butadiene rubber.
[0012] In a specific embodiment, the dispersant comprises an alkyl glycoside.
[0013] In a specific embodiment, the wetting agent includes alkylphenol polyoxyethylene ether.
[0014] In a specific embodiment, the filler comprises a combination of ground calcium carbonate and barite powder, wherein the filler has a particle size of 700-900 mesh, preferably 800 mesh.
[0015] In a specific embodiment, the silane coupling agent is KH550.
[0016] In a second aspect, the present application provides a method for preparing a polyacrylate sealant, comprising the following steps: First, adjust the pH value of the polyacrylate emulsion to 7 with ammonia water, then add the powder and stir evenly, then add the internal plasticizer and continue stirring; Add dispersant and wetting agent and continue stirring; After adding the filler and stirring thoroughly, continue to add the silane coupling agent, stir evenly and remove the bubbles to obtain the polyacrylate sealant.
[0017] In a specific embodiment, the stirring time of the polyacrylate emulsion and the opening powder is controlled at 25 to 35 minutes, preferably 30 minutes; the stirring time after adding the plasticizer is controlled at 55 to 65 minutes, preferably 60 minutes; the stirring time after adding the dispersant and the wetting agent is controlled at 25 to 35 minutes, preferably 30 minutes; the stirring time after adding the filler and the silane coupling agent is controlled at 25 to 35 minutes, preferably 30 minutes.
[0018] Compared with the prior art, the present invention has the following advantages and beneficial effects: The polyacrylate sealant of the present invention undergoes secondary polymerization of polyacrylate with an internal plasticizer under the action of a multifunctional auxiliary agent, pulling powder, so that the monomer of the internal plasticizer enters the macromolecular bond structure of the polyacrylate, thereby lowering the glass transition temperature of the polyacrylate and improving its flexibility. The plasticization effect is stable and long-lasting, and the sealant will not migrate or seep out over time, thereby ensuring long-term stability of the overall performance of the sealant. Not only is the flexibility improved, but also the low-temperature flexibility and durability are enhanced. DETAILED DESCRIPTION
[0019] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples. The illustrative embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.
[0020] In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that these specific details are not necessarily employed to practice the present invention. In other embodiments, well-known materials or methods are not specifically described to avoid obscuring the present invention.
[0021] Throughout this specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment of the present invention. Therefore, appearances of the phrases "one embodiment," "an embodiment," "an example," or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combinations and / or subcombinations. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. Furthermore, one skilled in the art will be able to combine and combine different embodiments or examples, and features of different embodiments or examples, described in this specification, without mutual inconsistency.
[0022] The "ranges" disclosed herein are defined in terms of lower and upper limits, where a given range is defined by selecting a lower limit and an upper limit, and the selected lower and upper limits define the boundaries of the particular range. Ranges defined in this manner can be inclusive or exclusive of the end values and can be combined arbitrarily, i.e., any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60 to 120 and 80 to 110 are listed for a particular parameter, it is understood that ranges of 60 to 110 and 80 to 120 are also contemplated. Furthermore, if minimum range values of 1 and 2 are listed, and if maximum range values of 3, 4, and 5 are listed, the following ranges are all contemplated: 1 to 3, 1 to 4, 1 to 5, 2 to 3, 2 to 4, and 2 to 5. In this application, unless otherwise indicated, the numerical range "a to b" is a shorthand representation of any combination of real numbers between a and b, where a and b are both real numbers. For example, a numerical range of "0-5" indicates that all real numbers between "0-5" are listed herein, and "0-5" is simply an abbreviation for these numerical combinations. Furthermore, when a parameter is expressed as an integer ≥ 2, this is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.
[0023] Unless otherwise specified, all steps of the present application may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), which means that the method may include steps (a) and (b) performed sequentially, or may include steps (b) and (a) performed sequentially. For example, the method may further include step (c), which means that step (c) may be added to the method in any order, for example, the method may include steps (a), (b), and (c), or may include steps (a), (c), and (b), or may include steps (c), (a), and (b), etc.
[0024] Example 1 This embodiment provides a method for preparing a polyacrylate sealant, the formula of which is: an appropriate amount of ammonia water, 100 parts of polyacrylate emulsion, 1.2 parts of opening powder, 11 parts of dibutyl maleate, 0.5 parts of alkyl glycoside, 0.5 parts of alkylphenol polyoxyethylene ether, 80 parts of heavy calcium carbonate, 40 parts of barite powder, and 4 parts of silane coupling agent KH-550.
[0025] The specific preparation method is: S1, polyacrylate emulsion is added into a stirred tank, wherein the pH value of the polyacrylate emulsion is 6, and the solid content of the polyacrylate emulsion is 60%. After adding appropriate amount of ammonia to adjust the pH value to 7 during stirring, the powder is added and stirred for 30 minutes.
[0026] S2. Add dibutyl maleate and continue stirring for 60 minutes, then add alkyl polyglycoside and alkylphenol polyoxyethylene ether, and continue stirring for 30 minutes.
[0027] S3. Add heavy calcium carbonate and barite powder and continue stirring for 30 minutes. Finally, add silane coupling agent KH-550 and stir evenly. Remove bubbles to obtain polyacrylate sealant. The particle size of heavy calcium carbonate and barite powder is 800 mesh.
[0028] Example 2 This embodiment provides a method for preparing a polyacrylate sealant, the formula of which is: an appropriate amount of ammonia water, 100 parts of polyacrylate emulsion, 1.5 parts of opening powder, 10 parts of dioctyl maleate, 0.5 parts of alkyl glycoside, 0.5 parts of alkylphenol polyoxyethylene ether, 80 parts of heavy calcium carbonate, 40 parts of barite powder, and 4 parts of silane coupling agent KH-550.
[0029] The specific preparation method is: S1, polyacrylate emulsion is added into a stirred tank, wherein the pH value of the polyacrylate emulsion is 6, and the solid content of the polyacrylate emulsion is 60%. After adding appropriate amount of ammonia to adjust the pH value to 7 during stirring, the powder is added and stirred for 30 minutes.
[0030] S2. Add dioctyl maleate and continue stirring for 60 minutes, then add alkyl polyglycoside and alkylphenol polyoxyethylene ether, and continue stirring for 30 minutes.
[0031] S3. Add heavy calcium carbonate and barite powder and continue stirring for 30 minutes. Finally, add silane coupling agent KH-550 and stir evenly. Remove bubbles to obtain polyacrylate sealant.
[0032] Example 3 This embodiment provides a method for preparing a polyacrylate sealant, the formula of which is: an appropriate amount of ammonia water, 100 parts of polyacrylate emulsion, 1.2 parts of opening powder, 5 parts of dibutyl maleate, 5 parts of dioctyl maleate, 0.5 parts of alkyl glycoside, 0.5 parts of alkylphenol polyoxyethylene ether, 80 parts of heavy calcium carbonate, 40 parts of barite powder, and 4 parts of silane coupling agent KH-550.
[0033] The specific preparation method is: S1, polyacrylate emulsion is added into a stirred tank, wherein the pH value of the polyacrylate emulsion is 6, and the solid content of the polyacrylate emulsion is 60%. After adding appropriate amount of ammonia to adjust the pH value to 7 during stirring, the powder is added and stirred for 30 minutes.
[0034] S2. Add dibutyl maleate and dioctyl maleate, continue stirring for 60 minutes, then add alkyl polyglycoside and alkylphenol polyoxyethylene ether, and continue stirring for 30 minutes.
[0035] S3. Add heavy calcium carbonate and barite powder and continue stirring for 30 minutes. Finally, add silane coupling agent KH-550 and stir evenly. Remove bubbles to obtain polyacrylate sealant.
[0036] Example 4 This embodiment provides a method for preparing a polyacrylate sealant, the formula of which is: an appropriate amount of ammonia water, 100 parts of polyacrylate emulsion, 1.8 parts of opening powder, 11 parts of dimethyl maleate, 0.5 parts of alkyl glycoside, 0.5 parts of alkylphenol polyoxyethylene ether, 80 parts of heavy calcium carbonate, 40 parts of barite powder, and 4 parts of silane coupling agent KH-550.
[0037] The specific preparation method is: S1, polyacrylate emulsion is added into a stirred tank, wherein the pH value of the polyacrylate emulsion is 6, and the solid content of the polyacrylate emulsion is 60%. After adding appropriate amount of ammonia to adjust the pH value to 7 during stirring, the powder is added and stirred for 30 minutes.
[0038] S2. Add dimethyl maleate and continue stirring for 60 minutes, then add alkyl polyglycoside and alkylphenol polyoxyethylene ether, and continue stirring for 30 minutes.
[0039] S3. Add heavy calcium carbonate and barite powder and continue stirring for 30 minutes. Finally, add silane coupling agent KH-550 and stir evenly. Remove bubbles to obtain polyacrylate sealant.
[0040] Example 5 This embodiment provides a method for preparing a polyacrylate sealant, the formula of which is: an appropriate amount of ammonia water, 100 parts of polyacrylate emulsion, 1.5 parts of opening powder, 5 parts of dioctyl maleate, 6 parts of dimethyl maleate, 0.5 parts of alkyl glycoside, 0.5 parts of alkylphenol polyoxyethylene ether, 80 parts of heavy calcium carbonate, 40 parts of barite powder, and 4 parts of silane coupling agent KH-550.
[0041] The specific preparation method is: S1. Add polyacrylate emulsion to a stirred tank, wherein the polyacrylate emulsion has a pH of 6 and a solid content of 60%. Add flaking powder during stirring and continue stirring for 30 minutes. S2. Add dioctyl maleate and dimethyl maleate and continue stirring for 60 minutes before adding alkyl polyglycoside and alkylphenol polyoxyethylene ether and continue stirring for 30 minutes.
[0042] S3. Add heavy calcium carbonate and barite powder and continue stirring for 30 minutes. Finally, add silane coupling agent KH-550 and stir evenly. Remove bubbles to obtain polyacrylate sealant.
[0043] Example 6 This embodiment provides a method for preparing a polyacrylate sealant, the formula of which is: an appropriate amount of ammonia water, 100 parts of polyacrylate emulsion, 1.6 parts of opening powder, 11 parts of liquid butadiene rubber, 0.5 parts of alkyl glycoside, 0.5 parts of alkylphenol polyoxyethylene ether, 80 parts of heavy calcium carbonate, 40 parts of barite powder, and 4 parts of silane coupling agent KH-550.
[0044] The specific preparation method is: S1, polyacrylate emulsion is added into a stirred tank, wherein the pH value of the polyacrylate emulsion is 6, and the solid content of the polyacrylate emulsion is 60%. After adding appropriate amount of ammonia to adjust the pH value to 7 during stirring, the powder is added and stirred for 30 minutes.
[0045] S2. Add liquid butadiene rubber and continue stirring for 60 minutes, then add alkyl polyglycoside and alkylphenol polyoxyethylene ether, and continue stirring for 30 minutes.
[0046] S3. Add heavy calcium carbonate and barite powder and continue stirring for 30 minutes. Finally, add silane coupling agent KH-550 and stir evenly. Remove bubbles to obtain polyacrylate sealant.
[0047] Example 7 This embodiment provides a method for preparing a polyacrylate sealant, the formula of which is: an appropriate amount of ammonia water, 100 parts of polyacrylate emulsion, 1.6 parts of opening powder, 5 parts of liquid butadiene rubber, 5 parts of dioctyl maleate, 0.5 parts of alkyl glycoside, 0.5 parts of alkylphenol polyoxyethylene ether, 80 parts of heavy calcium carbonate, 40 parts of barite powder, and 4 parts of silane coupling agent KH-550.
[0048] The specific preparation method is: S1, polyacrylate emulsion is added into a stirred tank, wherein the pH value of the polyacrylate emulsion is 6, and the solid content of the polyacrylate emulsion is 60%. After adding appropriate amount of ammonia to adjust the pH value to 7 during stirring, the powder is added and stirred for 30 minutes.
[0049] S2. Add liquid cis-1,4-dioctyl maleate and continue stirring for 60 minutes, then add alkyl polyglycoside and alkylphenol polyoxyethylene ether, and continue stirring for 30 minutes.
[0050] S3. Add heavy calcium carbonate and barite powder and continue stirring for 30 minutes. Finally, add silane coupling agent KH-550 and stir evenly. Remove bubbles to obtain polyacrylate sealant.
[0051] Example 8 This embodiment provides a method for preparing a polyacrylate sealant, the formula of which is: an appropriate amount of ammonia water, 100 parts of polyacrylate emulsion, 2.2 parts of opening powder, 11 parts of liquid polybutadiene rubber, 0.5 parts of alkyl glycoside, 0.5 parts of alkylphenol polyoxyethylene ether, 80 parts of heavy calcium carbonate, 40 parts of barite powder, and 4 parts of silane coupling agent KH-550.
[0052] The specific preparation method is: S1, polyacrylate emulsion is added into a stirred tank, wherein the pH value of the polyacrylate emulsion is 6, and the solid content of the polyacrylate emulsion is 60%. After adding appropriate amount of ammonia to adjust the pH value to 7 during stirring, the powder is added and stirred for 30 minutes.
[0053] S2. Add liquid polybutadiene rubber and continue stirring for 60 minutes, then add alkyl polyglycoside and alkylphenol polyoxyethylene ether, and continue stirring for 30 minutes.
[0054] S3. Add heavy calcium carbonate and barite powder and continue stirring for 30 minutes. Finally, add silane coupling agent KH-550 and stir evenly. Remove bubbles to obtain polyacrylate sealant. The particle size of heavy calcium carbonate and barite powder is 800 mesh.
[0055] Example 9 This embodiment provides a method for preparing a polyacrylate sealant, the formula of which is: an appropriate amount of ammonia water, 100 parts of polyacrylate emulsion, 1.8 parts of opening powder, 6 parts of liquid polybutadiene rubber, 5 parts of dibutyl maleate, 0.5 parts of alkyl glycoside, 0.5 parts of alkylphenol polyoxyethylene ether, 80 parts of heavy calcium carbonate, 40 parts of barite powder, and 4 parts of silane coupling agent KH-550.
[0056] The specific preparation method is: S1, polyacrylate emulsion is added into a stirred tank, wherein the pH value of the polyacrylate emulsion is 6, and the solid content of the polyacrylate emulsion is 60%. After adding appropriate amount of ammonia to adjust the pH value to 7 during stirring, the powder is added and stirred for 30 minutes.
[0057] S2. Add liquid polybutadiene rubber and dibutyl maleate in sequence, continue stirring for 60 minutes, then add alkyl polyglycoside and alkylphenol polyoxyethylene ether, and continue stirring for 30 minutes.
[0058] S3. Add heavy calcium carbonate and barite powder and continue stirring for 30 minutes. Finally, add silane coupling agent KH-550 and stir evenly. Remove bubbles to obtain polyacrylate sealant. The particle size of heavy calcium carbonate and barite powder is 800 mesh.
[0059] Example 10 This embodiment provides a method for preparing a polyacrylate sealant, the formula of which is: an appropriate amount of ammonia water, 100 parts of polyacrylate emulsion, 2.2 parts of opening powder, 11 parts of liquid polysulfide rubber, 0.5 parts of alkyl glycoside, 0.5 parts of alkylphenol polyoxyethylene ether, 80 parts of heavy calcium carbonate, 40 parts of barite powder, and 4 parts of silane coupling agent KH-550.
[0060] The specific preparation method is: S1, polyacrylate emulsion is added into a stirred tank, wherein the pH value of the polyacrylate emulsion is 6, and the solid content of the polyacrylate emulsion is 60%. After adding appropriate amount of ammonia to adjust the pH value to 7 during stirring, the powder is added and stirred for 30 minutes.
[0061] S2. Add liquid polysulfide rubber and continue stirring for 60 minutes, then add alkyl polyglycoside and alkylphenol polyoxyethylene ether, and continue stirring for 30 minutes.
[0062] S3. Add heavy calcium carbonate and barite powder and continue stirring for 30 minutes. Finally, add silane coupling agent KH-550 and stir evenly. Remove bubbles to obtain polyacrylate sealant. The particle size of heavy calcium carbonate and barite powder is 800 mesh.
[0063] Example 11 This embodiment provides a method for preparing a polyacrylate sealant, the formula of which is: an appropriate amount of ammonia water, 100 parts of polyacrylate emulsion, 2.2 parts of opening powder, 2 parts of liquid polysulfide rubber, 2 parts of liquid polybutadiene rubber, 2 parts of liquid butadiene rubber, 5 parts of dibutyl maleate, 0.5 parts of alkyl glycoside, 0.5 parts of alkylphenol polyoxyethylene ether, 80 parts of heavy calcium carbonate, 40 parts of barite powder, and 4 parts of silane coupling agent KH-550.
[0064] The specific preparation method is: S1, polyacrylate emulsion is added into a stirred tank, wherein the pH value of the polyacrylate emulsion is 6, and the solid content of the polyacrylate emulsion is 60%. After adding appropriate amount of ammonia to adjust the pH value to 7 during stirring, the powder is added and stirred for 30 minutes.
[0065] S2. Add liquid polysulfide rubber, liquid polybutadiene rubber, liquid butadiene rubber, and dibutyl maleate in sequence, and continue stirring for 60 minutes. Then, add alkyl polyglycoside and alkylphenol polyoxyethylene ether, and continue stirring for 30 minutes.
[0066] S3. Add heavy calcium carbonate and barite powder and continue stirring for 30 minutes. Finally, add silane coupling agent KH-550 and stir evenly. Remove bubbles to obtain polyacrylate sealant. The particle size of heavy calcium carbonate and barite powder is 800 mesh.
[0067] Comparative Example 1 This comparative example provides a preparation method of a polyacrylate sealant. Unlike Example 1, no opening powder is added in this comparative example. The formula is: 100 parts of polyacrylate emulsion, 11 parts of dibutyl maleate, 0.5 parts of alkyl glycoside, 0.5 parts of alkylphenol polyoxyethylene ether, 80 parts of heavy calcium carbonate, 40 parts of barite powder, and 4 parts of silane coupling agent KH-550.
[0068] The specific preparation method is: S1, polyacrylate emulsion is added into a stirred tank, wherein the pH value of the polyacrylate emulsion is 6, and the solid content of the polyacrylate emulsion is 60%. After adding appropriate amount of ammonia to adjust the pH value to 7 during stirring, the powder is added and stirred for 30 minutes.
[0069] S2. Add dibutyl maleate and continue stirring for 60 minutes, then add alkyl polyglycoside and alkylphenol polyoxyethylene ether, and continue stirring for 30 minutes.
[0070] S3. Add heavy calcium carbonate and barite powder and continue stirring for 30 minutes. Finally, add silane coupling agent KH-550 and stir evenly. Remove bubbles to obtain polyacrylate sealant. The particle size of heavy calcium carbonate and barite powder is 800 mesh.
[0071] Comparative Example 2 This comparative example provides a preparation method of a polyacrylate sealant. The difference from Example 1 is that the amount of opening powder added in this comparative example is 0.3 parts, and the formula is: 100 parts of polyacrylate emulsion, 0.3 parts of opening powder, 11 parts of dibutyl maleate, 0.5 parts of alkyl glycoside, 0.5 parts of alkylphenol polyoxyethylene ether, 80 parts of heavy calcium carbonate, 40 parts of barite powder, and 4 parts of silane coupling agent KH-550.
[0072] The specific preparation method is: S1, polyacrylate emulsion is added into a stirred tank, wherein the pH value of the polyacrylate emulsion is 6, and the solid content of the polyacrylate emulsion is 60%. After adding appropriate amount of ammonia to adjust the pH value to 7 during stirring, the powder is added and stirred for 30 minutes.
[0073] S2. Add dibutyl maleate and continue stirring for 60 minutes, then add alkyl polyglycoside and alkylphenol polyoxyethylene ether, and continue stirring for 30 minutes.
[0074] S3. Add heavy calcium carbonate and barite powder and continue stirring for 30 minutes. Finally, add silane coupling agent KH-550 and stir evenly. Remove bubbles to obtain polyacrylate sealant. The particle size of heavy calcium carbonate and barite powder is 800 mesh.
[0075] Comparative Example 3 This comparative example provides a preparation method of a polyacrylate sealant. The difference from Example 1 is that the amount of opening powder added in this comparative example is 2.5 parts, and the formula is: 100 parts of polyacrylate emulsion, 2.5 parts of opening powder, 11 parts of dibutyl maleate, 0.5 parts of alkyl glycoside, 0.5 parts of alkylphenol polyoxyethylene ether, 80 parts of heavy calcium carbonate, 40 parts of barite powder, and 4 parts of silane coupling agent KH-550.
[0076] The specific preparation method is: S1, polyacrylate emulsion is added into a stirred tank, wherein the pH value of the polyacrylate emulsion is 6, and the solid content of the polyacrylate emulsion is 60%. After adding appropriate amount of ammonia to adjust the pH value to 7 during stirring, the powder is added and stirred for 30 minutes.
[0077] S2. Add dibutyl maleate and continue stirring for 60 minutes, then add alkyl polyglycoside and alkylphenol polyoxyethylene ether, and continue stirring for 30 minutes.
[0078] S3. Add heavy calcium carbonate and barite powder and continue stirring for 30 minutes. Finally, add silane coupling agent KH-550 and stir evenly. Remove bubbles to obtain polyacrylate sealant. The particle size of heavy calcium carbonate and barite powder is 800 mesh.
[0079] Comparative Example 4 This comparative example provides a preparation method of a polyacrylate sealant. Unlike Example 1, the pH value of the polyacrylate emulsion in this comparative example is 4, and the formula is: 100 parts of polyacrylate emulsion, 2.5 parts of opening powder, 11 parts of dibutyl maleate, 0.5 parts of alkyl glycoside, 0.5 parts of alkylphenol polyoxyethylene ether, 80 parts of heavy calcium carbonate, 40 parts of barite powder, and 4 parts of silane coupling agent KH-550.
[0080] The specific preparation method is: S1, polyacrylate emulsion is added into a stirred tank, wherein the pH value of the polyacrylate emulsion is 6, and the solid content of the polyacrylate emulsion is 60%. After adding appropriate amount of ammonia to adjust the pH value to 7 during stirring, the powder is added and stirred for 30 minutes.
[0081] S2. Add dibutyl maleate and continue stirring for 60 minutes, then add alkyl polyglycoside and alkylphenol polyoxyethylene ether, and continue stirring for 30 minutes.
[0082] S3. Add heavy calcium carbonate and barite powder and continue stirring for 30 minutes. Finally, add silane coupling agent KH-550 and stir evenly. Remove bubbles to obtain polyacrylate sealant. The particle size of heavy calcium carbonate and barite powder is 800 mesh.
[0083] The properties of the polyacrylate sealants prepared in Examples 1 to 11 and Comparative Examples 1 to 4 were tested, and the test results are shown in Table 1.
[0084] Table 1
[0085] As can be seen from the test results in Table 1, the polyacrylate sealant of the present invention undergoes secondary polymerization of polyacrylate with an internal plasticizer under the action of the multifunctional auxiliary agent, the opening powder, so that the monomer of the internal plasticizer enters the macromolecular bond structure of the polyacrylate, thereby lowering the glass transition temperature of the polyacrylate and improving its flexibility. The plasticization effect is stable and long-lasting, and the sealant will not migrate or seep out over time. This ensures long-term stability of the overall performance of the sealant, improving not only the flexibility but also the low-temperature flexibility and durability.
[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that it is still possible to modify the technical solutions described in the above embodiments, or to replace some or all of the technical features therein by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention.
Claims
1. A polyacrylate sealant, characterized in that: Calculated by weight, an appropriate amount of ammonia water includes 100 parts of polyacrylate emulsion, 0.5-2.2 parts of opening powder, 9-12 parts of internal plasticizer, 0.5 part of dispersant, 0.5 part of wetting agent, 120 parts of filler, and 4 parts of silane coupling agent.
2. The polyacrylate sealant according to claim 1, characterized in that: The solid content of the polyacrylate emulsion is 59% to 61%.
3. The polyacrylate sealant according to claim 1, characterized in that: The pH value of the polyacrylate emulsion is 5-7.
4. The polyacrylate sealant according to claim 1, characterized in that: The internal plasticizer includes any one or more combinations of dimethyl maleate, dibutyl maleate, dioctyl maleate, liquid butadiene rubber, liquid polysulfide rubber and liquid polybutadiene rubber.
5. The polyacrylate sealant according to claim 1, characterized in that: The dispersant includes an alkyl glycoside.
6. The polyacrylate sealant according to claim 1, characterized in that: The wetting agent includes alkylphenol polyoxyethylene ether.
7. The polyacrylate sealant according to claim 1, characterized in that: The filler includes any one of heavy calcium carbonate and recrystallized stone powder or a combination of the two.
8. The polyacrylate sealant according to claim 1, characterized in that: The silane coupling agent is KH550.
9. A method for preparing a polyacrylate sealant, characterized in that: The following steps are involved: First, adjust the pH value of the polyacrylate emulsion to 7 with an appropriate amount of ammonia water, then add the opening powder and stir well, then add the internal plasticizer and continue stirring; Add dispersant and wetting agent and continue stirring; After adding the filler and stirring, continue to add the silane coupling agent, stir evenly and remove the bubbles to obtain the polyacrylate sealant.
10. The method for preparing a polyacrylate sealant according to claim 9, characterized in that: The stirring time of the polyacrylate emulsion adjusted to a pH value of 7 and the opening powder is controlled within 25 to 35 minutes, the stirring time after adding the plasticizer is controlled within 55 to 65 minutes, the stirring time after adding the dispersant and wetting agent is controlled within 25 to 35 minutes, and the stirring time after adding the filler and silane coupling agent is controlled within 25 to 35 minutes.