阅读说明：本技术 一种长效抗老化型水泥基防水涂料及其制备方法 (Long-acting anti-aging cement-based waterproof coating and preparation method thereof ) 是由 谭祖干 于 2020-12-16 设计创作，主要内容包括：本发明涉及一种长效抗老化型水泥基防水涂料及其制备方法,属于涂料材料技术领域。在本发明技术方案中,微胶囊材料采用的是聚吡咯为壁材材料,聚吡咯材料由于性能稳定,同时在其使用过程中,涂层材料由于受到外力导致结构性能发生破损,首先,二氧化钛溶胶材料作为一种成膜材料,先释放自修复粒子来实现防水自修复,其次,二氧化钛的溶胶释放后,有效对乳液成膜材料的抗紫外老化性能进行有效的改善,这有由于二氧化钛凝胶材料吸收紫外线的同时也能发射和散射紫外线,因此二氧化钛屏蔽紫外线的能力强,从而进一步延缓紫外线对乳液材料的影响,从而改善材料的抗紫外性能,从而有效提高材料的抗老化强度。(The invention relates to a long-acting anti-aging cement-based waterproof coating and a preparation method thereof, belonging to the technical field of coating materials. In the technical scheme of the invention, polypyrrole is adopted as a wall material for a microcapsule material, the polypyrrole material is stable in performance, and meanwhile, in the using process of the polypyrrole material, a coating material is damaged in structural performance due to external force, firstly, a titanium dioxide sol material is used as a film forming material, self-repairing particles are firstly released to realize waterproof self-repairing, and secondly, after the titanium dioxide sol is released, the ultraviolet aging resistance of the emulsion film forming material is effectively improved, and the titanium dioxide gel material can emit and scatter ultraviolet rays while absorbing the ultraviolet rays, so that the ultraviolet ray shielding capability of the titanium dioxide is strong, the influence of the ultraviolet rays on the emulsion material is further delayed, the ultraviolet resistance of the material is improved, and the aging resistance strength of the material is effectively improved.)

1. The long-acting anti-aging cement-based waterproof coating is characterized by comprising the following components in parts by weight:

45-50 parts of heavy calcium carbonate;

10-15 parts of quartz powder;

25-30 parts of titanium dioxide sol microcapsule particles;

10-15 parts of light calcium carbonate powder;

6-8 parts of wollastonite;

75-80 parts of VAE emulsion;

5-15 parts of a mixed auxiliary agent;

100-200 parts of water;

1-2 parts of a silane coupling agent; the titanium dioxide sol microcapsule particles are composite microcapsule materials prepared by coating nanometer titanium sol with polypyrrole as a wall material.

2. The long-acting anti-aging cement-based waterproof coating as claimed in claim 1, which is prepared by the following steps: mixing heavy calcium carbonate, quartz powder, titanium dioxide sol microcapsule particles, light calcium carbonate powder, wollastonite, VAE emulsion, a mixed assistant and water, stirring and dispersing, standing and defoaming for 3-5 hours, and preparing the long-acting anti-aging cement-based waterproof coating.

3. The long-acting anti-aging cement-based waterproof coating as claimed in claim 2, wherein the stirring dispersion is at a speed of 800-1000 r/min for 5-10 min at room temperature.

4. The long-acting anti-aging cement-based waterproof coating as claimed in claim 1, wherein the mixed auxiliary agent is prepared by respectively weighing 0.5-1.0 part by weight of an antifoaming agent, 1-2 parts by weight of a film forming auxiliary agent, 2-3 parts by weight of a leveling agent, 3-5 parts by weight of a water reducing agent, 2-3 parts by weight of a thickening agent and 1-2 parts by weight of a silane coupling agent and mixing.

5. The long-acting anti-aging cement-based waterproof coating as claimed in claim 1, wherein the preparation steps of the titanium dioxide sol microcapsule particles are as follows:

s1, stirring and mixing the nano titanium dioxide sol solution with sodium dodecyl benzene sulfonate and sodium oleate, placing the mixture into a stirrer for stirring treatment, collecting the mixed solution, performing ultrasonic dispersion, and collecting the dispersed emulsion;

s2, adding pyrrole monomers into the dispersed emulsion according to the mass ratio of 1:3, adjusting the pH value to 3.5, carrying out polymerization treatment and collecting a polymerization reaction liquid;

and S3, adding an ammonium persulfate solution with the mass fraction of 5% into the polymerization reaction liquid, carrying out heat preservation polymerization treatment again, standing and cooling to room temperature, filtering, washing a filter cake to be neutral, and drying to obtain the titanium dioxide sol microcapsule particles.

6. The long-acting anti-aging cement-based waterproof coating as claimed in claim 5, wherein: in the step S1, the mixing ratio of the nano titanium dioxide sol solution to the sodium dodecyl benzene sulfonate and the sodium oleate is 1:4:10 by mass.

7. The long-acting anti-aging cement-based waterproof coating as claimed in claim 5, wherein: the polymerization treatment in the step S2 is polymerization treatment for 25-30 min at 75-80 ℃ under 200-300W ultrasonic dispersion environment.

8. The long-acting anti-aging cement-based waterproof coating as claimed in claim 5, wherein: the adding amount of the ammonium persulfate solution with the mass fraction of 5% in the step S3 is 1:200 by mass, and the ammonium persulfate solution with the mass fraction of 5% is added into the polymerization reaction liquid.

Technical Field

The invention relates to a long-acting anti-aging cement-based waterproof coating and a preparation method thereof, belonging to the technical field of coating materials.

Background

The waterproof paint is a bi-component waterproof paint consisting of liquid material and powder material, wherein the liquid material mainly comprises emulsion, auxiliary agents (such as film forming auxiliary agents, defoaming agents and the like) are arranged secondly, the powder material mainly comprises cement, and the powder material comprises talcum powder, light calcium carbonate and other fillers. The emulsion used for the waterproof coating is various, and mainly comprises three types of ethylene-vinyl acetate copolymer emulsion, acrylate emulsion and butylbenzene emulsion.

After the solid component and the liquid component of the two-component polymer cement waterproof coating are mixed and stirred uniformly according to a certain proportion and coated on a base material, the waterproof coating can be gradually cured to form a coating film with certain strength and toughness along with the volatilization of water in the coating and the proceeding of cement hydration. When the polymer emulsion is mixed with cement and filler, the polymer emulsion particles are uniformly dispersed around the cement and filler. The cement is subjected to hydration reaction under the condition of sufficient water content, so that calcium hydroxide is saturated and crystals are separated out to generate calcium silicate hydrate and ettringite gel, and latex particles enter pores between the gel and the filler along with the calcium hydroxide hydrate and the ettringite gel. With the progress of cement hydration reaction and continuous volatilization of water, the water content in the coating film is reduced, and the latex particles are gradually adhered together to form a continuous emulsion film between pores between the gel and the filler. The emulsion film penetrates through a network which forms a three-dimensional structure between the gel and the filler, so that the gel and the filler are mutually connected and the coating film is endowed with good flexibility. Active groups in polymer molecules and metal ions such as calcium ions, aluminum ions and the like in cement hydration products are subjected to cross-linking reaction to form a bridging action, so that internal stress is effectively buffered, cracks are reduced, and the compactness of a coating film is enhanced.

However, the existing waterproof coating has the defects of poor mechanical property, insufficient waterproofness and corrosion resistance, poor solvent resistance, short service life and poor long-term durability, and particularly, a coating is easy to absorb water under a high-humidity environment to cause volume expansion, poor waterproof performance and poor environmental adaptability, so that effective modification of the existing waterproof coating is necessary.

Disclosure of Invention

The invention aims to provide a preparation method of a durable cement-based waterproof coating, which aims to solve one of the problems in the prior art.

In order to achieve the purpose, the invention provides the following technical scheme:

the long-acting anti-aging cement-based waterproof coating comprises the following substances in parts by weight:

45-50 parts of heavy calcium carbonate;

10-15 parts of quartz powder;

25-30 parts of titanium dioxide sol microcapsule particles;

10-15 parts of light calcium carbonate powder;

6-8 parts of wollastonite;

75-80 parts of VAE emulsion;

5-15 parts of a mixed auxiliary agent;

100-200 parts of water;

1-2 parts of a silane coupling agent; the titanium dioxide sol microcapsule particles are composite microcapsule materials prepared by coating nanometer titanium sol with polypyrrole as a wall material.

The preparation method of the long-acting anti-aging cement-based waterproof coating comprises the following steps: mixing heavy calcium carbonate, quartz powder, titanium dioxide sol microcapsule particles, light calcium carbonate powder, wollastonite, VAE emulsion, a mixed assistant and water, stirring and dispersing, standing and defoaming for 3-5 hours, and preparing the long-acting anti-aging cement-based waterproof coating.

The stirring dispersion is carried out at the speed of 800-1000 r/min for 5-10 min at room temperature.

The mixed auxiliary agent is prepared by respectively weighing 0.5-1.0 part of defoaming agent, 1-2 parts of film-forming auxiliary agent, 2-3 parts of flatting agent, 3-5 parts of water reducing agent, 2-3 parts of thickening agent and 1-2 parts of silane coupling agent according to parts by weight and mixing.

The preparation steps of the titanium dioxide sol microcapsule particles are as follows:

s1, stirring and mixing the nano titanium dioxide sol solution with sodium dodecyl benzene sulfonate and sodium oleate, placing the mixture into a stirrer for stirring treatment, collecting the mixed solution, performing ultrasonic dispersion, and collecting the dispersed emulsion;

s2, adding pyrrole monomers into the dispersed emulsion according to the mass ratio of 1:3, adjusting the pH value to 3.5, carrying out polymerization treatment and collecting a polymerization reaction liquid;

s3, adding an ammonium persulfate solution with the mass fraction of 5% into the polymerization reaction solution, carrying out heat preservation polymerization treatment again, standing and cooling to room temperature, filtering and washing a filter cake to be neutral, and drying to obtain titanium dioxide sol microcapsule particles;

in the step S1, the mixing ratio of the nano titanium dioxide sol solution to the sodium dodecyl benzene sulfonate and the sodium oleate is 1:4:10 by mass.

The polymerization treatment in the step S2 is polymerization treatment for 25-30 min at 75-80 ℃ under 200-300W ultrasonic dispersion environment.

The adding amount of the ammonium persulfate solution with the mass fraction of 5% in the step S3 is 1:200 by mass, and the ammonium persulfate solution with the mass fraction of 5% is added into the polymerization reaction liquid.

Compared with the prior art, the invention has the beneficial effects that:

(1) the technical scheme of the invention adopts pyrrole polymerization and titanium dioxide sol embedding to prepare microcapsule materials as modified fillers, and the prepared nano microcapsule materials are formed into spherical particles with uniform particle size and diameter of about 100nm and are added into the materials;

(2) in the technical scheme of the invention, the microcapsule material adopts polypyrrole as a wall material, the polypyrrole material has stable performance, and meanwhile, in the using process of the microcapsule material, the coating material is damaged due to external force, firstly, the titanium dioxide sol material is used as a film forming material, self-repairing particles are firstly released to realize waterproof self-repairing, and secondly, after the titanium dioxide sol is released, the ultraviolet aging resistance of the emulsion film forming material is effectively improved.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Stirring and mixing a nano titanium dioxide sol solution, sodium dodecyl benzene sulfonate and sodium oleate according to a mass ratio of 1:4:10, placing the mixture into a stirrer, stirring and treating for 1-2 hours, collecting a mixed solution, placing the mixed solution into a stirrer, performing ultrasonic dispersion for 10-15 minutes under 200-300W, collecting a dispersed emulsion, adding a pyrrole monomer into the dispersed emulsion according to a mass ratio of 1:3, adjusting the pH to 3.5 by using glacial acetic acid, performing polymerization treatment for 25-30 minutes under an ultrasonic dispersion environment of 200-300W at 75-80 ℃, collecting a polymerization reaction solution, adding an ammonium persulfate solution with a mass fraction of 5% into the polymerization reaction solution according to a mass ratio of 1:200, performing heat preservation polymerization treatment for 1-2 hours again, standing and cooling to room temperature, filtering and washing a filter cake to be neutral, and drying at 45-50 ℃ for 6-8 hours to prepare titanium dioxide sol microcapsule particles;

respectively weighing 45-50 parts by weight of heavy calcium carbonate, 10-15 parts by weight of quartz powder, 25-30 parts by weight of titanium dioxide sol microcapsule particles, 10-15 parts by weight of light calcium carbonate powder and 6-8 parts by weight of wollastonite, stirring, mixing, grinding and sieving to obtain mixed powder.

Respectively weighing 75-80 parts by weight of VAE emulsion, 0.5-1.0 part by weight of defoaming agent, 1-2 parts by weight of film-forming additive, 2-3 parts by weight of flatting agent, 3-5 parts by weight of water reducing agent, 2-3 parts by weight of thickening agent, 100-200 parts by weight of water and 1-2 parts by weight of silane coupling agent, stirring, mixing, grinding and sieving, and collecting to obtain a mixed solution.

And mixing the mixed solution and the mixed powder according to the mass ratio of 1:3, stirring and dispersing at the speed of 800-1000 r/min for 5-10 min at room temperature, standing and defoaming for 3-5 h, and thus obtaining the long-acting anti-aging cement-based waterproof coating.

Example 1

Stirring and mixing the nano titanium dioxide sol solution with sodium dodecyl benzene sulfonate and sodium oleate according to a mass ratio of 1:4:10, stirring and processing the mixture in a stirrer for 1h, collecting the mixed solution, placing the mixed solution into 200W for ultrasonic dispersion for 10min, collecting dispersed emulsion, adding pyrrole monomer into the dispersed emulsion according to a mass ratio of 1:3, adjusting the pH value to 3.5 by using glacial acetic acid, polymerizing the mixture for 25min under an ultrasonic dispersion environment of 75 ℃ and 200W, collecting the polymerized reaction solution, adding ammonium persulfate solution with the mass fraction of 5% into the polymerized reaction solution according to a mass ratio of 1:200, preserving heat again, polymerizing the mixture for 1h, standing and cooling the mixture to room temperature, filtering and washing a filter cake to be neutral, and drying the mixture for 6h at 45 ℃ to prepare titanium dioxide sol microcapsule particles;

respectively weighing 45 parts of heavy calcium carbonate, 10 parts of quartz powder, 25 parts of titanium dioxide sol microcapsule particles, 10 parts of light calcium carbonate powder and 6 parts of wollastonite in parts by weight, stirring, mixing, grinding and sieving to obtain mixed powder.

Respectively weighing 75 parts of VAE emulsion, 0.5 part of defoaming agent, 1 part of film-forming aid, 2 parts of flatting agent, 3 parts of water reducing agent, 2 parts of thickening agent, 100 parts of water and 1 part of silane coupling agent according to parts by weight, stirring, mixing, grinding and sieving to obtain a mixed solution.

And mixing the mixed solution and the mixed powder according to the mass ratio of 1:3, stirring and dispersing at the speed of 800r/min for 5min at room temperature, standing and defoaming for 3h, and thus obtaining the long-acting anti-aging cement-based waterproof coating.

Example 2

Stirring and mixing the nano titanium dioxide sol solution with sodium dodecyl benzene sulfonate and sodium oleate according to a mass ratio of 1:4:10, stirring and processing the mixture in a stirrer for 1h, collecting the mixed solution, placing the mixed solution into a stirrer for ultrasonic dispersion for 12min under 250W, collecting dispersed emulsion, adding pyrrole monomers into the dispersed emulsion according to a mass ratio of 1:3, adjusting the pH value to 3.5 by using glacial acetic acid, carrying out polymerization treatment for 27min under an ultrasonic dispersion environment of 77 ℃ and 250W, collecting the polymerization reaction solution, adding ammonium persulfate solution with the mass fraction of 5% into the polymerization reaction solution according to a mass ratio of 1:200, carrying out heat preservation polymerization treatment for 1h again, standing and cooling to room temperature, filtering and washing a filter cake to be neutral, and drying for 7h at 47 ℃ to prepare titanium dioxide sol microcapsule particles;

respectively weighing 47 parts by weight of heavy calcium carbonate, 12 parts by weight of quartz powder, 27 parts by weight of titanium dioxide sol microcapsule particles, 12 parts by weight of light calcium carbonate powder and 7 parts by weight of wollastonite, stirring, mixing, grinding and sieving to obtain mixed powder.

Respectively weighing 77 parts of VAE emulsion, 0.7 part of defoaming agent, 1 part of film-forming aid, 2 parts of flatting agent, 4 parts of water reducing agent, 2 parts of thickening agent, 150 parts of water and 1 part of silane coupling agent according to parts by weight, stirring, mixing, grinding and sieving to obtain a mixed solution.

And mixing the mixed solution and the mixed powder according to the mass ratio of 1:3, stirring and dispersing at the speed of 900r/min for 7min at room temperature, standing and defoaming for 4h, and thus obtaining the long-acting anti-aging cement-based waterproof coating.

Example 4

Respectively weighing 47 parts by weight of heavy calcium carbonate, 12 parts by weight of quartz powder, 12 parts by weight of light calcium carbonate powder and 7 parts by weight of wollastonite, stirring, mixing, grinding and sieving to obtain mixed powder.

Respectively weighing 77 parts of VAE emulsion, 0.7 part of defoaming agent, 1 part of film-forming aid, 2 parts of flatting agent, 4 parts of water reducing agent, 2 parts of thickening agent, 150 parts of water and 1 part of silane coupling agent according to parts by weight, stirring, mixing, grinding and sieving to obtain a mixed solution.

And mixing the mixed solution and the mixed powder according to the mass ratio of 1:3, stirring and dispersing at the speed of 900r/min for 7min at room temperature, standing and defoaming for 4h, and thus obtaining the long-acting anti-aging cement-based waterproof coating.

TABLE 1 comparison of Properties

From the above table, it can be seen that examples 1, 2 and 3 prepared by the present invention have excellent waterproof and mechanical properties, and meanwhile, compared with example 4, the mechanical properties of the present invention are significantly reduced compared with examples 1, 2 and 3, which indicates that the technical scheme of the present invention employs pyrrole to polymerize and embed titanium dioxide sol to prepare microcapsule material as modified filler, and in the using process, the coating material is damaged due to external force, firstly, the titanium dioxide sol material is used as a film forming material, and firstly, self-repairing particles are released to realize waterproof and self-repairing, secondly, after the titanium dioxide sol is released, the ultraviolet aging resistance of the emulsion film forming material is effectively improved, and this has the advantage that the titanium dioxide gel material can emit and scatter ultraviolet rays while absorbing ultraviolet rays, so that the titanium dioxide has strong ultraviolet ray shielding capability, thereby further delaying the influence of ultraviolet rays on the emulsion material, improving the ultraviolet resistance of the material and effectively improving the aging resistance of the material.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.