CN115838558A - Mildew-proof coating material for phosphogypsum building material - Google Patents
Mildew-proof coating material for phosphogypsum building material Download PDFInfo
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- CN115838558A CN115838558A CN202211310574.XA CN202211310574A CN115838558A CN 115838558 A CN115838558 A CN 115838558A CN 202211310574 A CN202211310574 A CN 202211310574A CN 115838558 A CN115838558 A CN 115838558A
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention discloses a mildew-proof coating material for ardealite building materials, and belongs to the field of building materials. The mildew-proof coating material for the ardealite building material is prepared from the following components in percentage by weight: 20 to 40 percent of filler (calcium carbonate), 25 to 30 percent of epoxy resin, 15 to 25 percent of pure water, 10 to 15 percent of calcium hydroxide, 5 to 10 percent of hydrophobic agent (polydimethylsiloxane), 4 to 6 percent of curing agent (650 low molecular weight polyamide) and 1 to 2 percent of defoaming agent; the invention also discloses a preparation method of the mildew-proof coating. The calcium hydroxide added into the mildew-proof coating has strong bacteriostatic ability, can neutralize the acid environment of the phosphogypsum building material, and simultaneously adds the hydrophobing agent which can make the moisture in the external environment difficult to permeate into the phosphogypsum building material coated with the mildew-proof coating, so that the mildew-proof mechanism of the mildew-proof coating prepared by the invention is to solve the mildew problem of the phosphogypsum building material from the three aspects of physics, chemistry and biology, and can play a good protection role on the phosphogypsum building material.
Description
Technical Field
The invention relates to the field of building materials, in particular to a mildew-proof coating material for ardealite building materials.
Background
The phosphogypsum building material mildewing means that a weakly acidic environment can be created by residual phosphate in the phosphogypsum under the condition of high air humidity, so that a large amount of mould which is suitable for the environment can grow and propagate. The situation occurs for a long time, which not only can cause immeasurable consequences to the building materials, but also can seriously harm the physical and mental health of human bodies. Therefore, how to achieve the purpose of inhibiting and killing the mold by destroying the biological structure of the mold or changing the appropriate conditions and the appropriate environment required by the growth of the mold is a great problem to be solved urgently in large-scale production and application of the phosphogypsum building material.
The coating is a solid film obtained after the coating is uniformly coated and cured on the surface of an object, can isolate the coated object from directly contacting with the external environment, and plays roles in protecting, insulating, decorating appearance and the like. The coating on the surface of the building material is a measure which is simple to operate and low in cost, and not only can effectively cover uneven pits on the surface of the building material to achieve the effect of improving the appearance, but also can repair the damaged part of the original coating at any time. Conventional coatings do not provide good protection against the growth and proliferation of mold on the surface of the building material, except when the coated building material is corroded by mold.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a mildew-proof coating material for phosphogypsum building materials.
The purpose of the invention can be realized by the following technical scheme:
the mildew-proof coating material for the phosphogypsum building material comprises the following raw materials in percentage by weight: 20 to 40 percent of filler, 25 to 30 percent of epoxy resin, 15 to 25 percent of pure water, 10 to 15 percent of calcium hydroxide, 5 to 10 percent of hydrophobic agent, 4 to 6 percent of curing agent and 1 to 2 percent of defoaming agent.
Optionally, the epoxy resin is epoxy resin E-44 with an epoxy value of 0.41-0.47.
Optionally, the filler is 1000 mesh calcium carbonate particles.
Optionally, the hydrophobic agent is polydimethylsiloxane.
Optionally, the curing agent is 650 low molecular weight polyamide.
A preparation method of the mildew-proof coating material for the ardealite building material comprises the following steps:
firstly, adding 10-15 parts by weight of filler into a container, and then adding 15-25 parts by weight of pure water into a reaction kettle to be stirred and dissolved;
secondly, adding 5-10 parts by weight of hydrophobing agent into the reaction kettle and stirring the mixture under the stirring state;
step three, grinding 20-40 parts by weight of filler in a ball mill, sieving with a 1000-mesh sieve, adding into the reaction kettle in the step two, and stirring;
fourthly, adding 25 to 30 weight parts of epoxy resin, and stirring at constant temperature when heating to 30 ℃ in a water bath;
and step five, sequentially adding 4-6 parts by weight of curing agent and 1-2 parts by weight of defoaming agent and stirring to obtain the coating material.
Optionally, the epoxy resin is epoxy resin E-44 with an epoxy value of 0.41-0.47.
Optionally, the hydrophobic agent is polydimethylsiloxane.
Optionally, the filler is 1000 mesh calcium carbonate particles.
Optionally, the curing agent is 650 low molecular weight polyamide.
The invention has the beneficial effects that:
the main components in the mildew-proof coating of the invention comprise epoxy resin E-44 and calcium hydroxide. The epoxy resin E-44 has strong adhesive force and adhesive strength after being cured, so that the coating can be tightly bonded with the surface of the phosphogypsum building material, the contact between the phosphogypsum building material and the outside air can be isolated, and aerobic mould can not grow on the surface of the phosphogypsum building material. Meanwhile, calcium hydroxide is an alkaline substance, and can perform acid-base neutralization on the weak acid environment of the phosphogypsum, so that essential acidic conditions are lacked for the growth of mould. And the calcium hydroxide can also denature the protein of the microorganism, thereby achieving the effect of inhibiting and even killing the mould.
The mildew-proof coating is characterized in that polydimethylsiloxane is added as a hydrophobic agent, and the action of the hydrophobic agent is that after the coating is cured, a special waterproof structure is formed on the surface of the coating by changing the contact angle between water drops and the surface of the coating, so that the surface of the coating has good waterproof and hydrophobic effects. Because proper external conditions such as temperature, air humidity, oxygen and the like are required for the growth of the mould, under the action of the hydrophobing agent, moisture in the external environment is difficult to permeate into the ardealite building material coated with the mildewproof coating, and the possibility of mass growth and propagation of the mould on the surface of the building material is reduced.
In general, the antibacterial effect of the mildew-proof coating provided by the invention starts from three aspects of physics, chemistry and biology, has extremely close synergistic effect, can enhance the antibacterial and mildew-proof effects, and has extremely wide application prospect.
Drawings
The invention is further described below with reference to the accompanying drawings.
Fig. 1 is a flow chart of a preparation method of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in 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.
Example 1:
the reagents and drugs used below were dispensed in weight percent in the formulation based on a total weight of 200 g.
Firstly, weighing 30g of calcium hydroxide, grinding, sieving with a 1000-mesh sieve, adding into a glass container, adding 40g of pure water under stirring, and stirring for 20min until the solution is in an opaque state;
secondly, adding 10g of hydrophobic agent (polydimethylsiloxane) into the emulsion containing the calcium hydroxide under the stirring state, and stirring for 10min to uniformly disperse the hydrophobic agent in the emulsion;
step three, 58g of calcium carbonate is ground in a ball mill, sieved by a 1000-mesh sieve, and then 1000-mesh calcium carbonate particles are added into the emulsion in the second step at one time under the state of slow stirring, and are stirred at a high speed for 20min after all the calcium carbonate particles are added;
fourthly, adding 50g of epoxy resin, heating to 30 ℃ in a water bath, and stirring for 30min at constant temperature;
and fifthly, sequentially adding 10g of curing agent (650 g of low molecular weight polyamide) and 2g of defoaming agent (mineral oil defoaming agent) and stirring for 10min to obtain a finished product of the mildew-proof coating.
Selecting two phosphogypsum test pieces, wherein one of the two phosphogypsum test pieces is coated with the finished product prepared by the method by adopting a rolling brush coating mode, the finished product is uniformly coated on the long side of the test piece at an angle of 90 degrees, and in the rolling coating process, the coating covers and infiltrates rough and uneven particles on the surface of the phosphogypsum test piece, the rough and uneven particles are infiltrated into gaps and are fully attached to the surface of the phosphogypsum test piece, and then the coating is naturally dried under natural conditions to form the mildew-proof and bacteriostatic coating. And the other phosphogypsum test piece is not treated and is taken as a control group.
Two phosphogypsum test pieces are placed in the same environment, and the results are compared after 28 days. The experimental result shows that no mould trace is found on the surface of the ardealite test piece coated with the mould-proof coating, the mould-proof rate reaches 100%, the mould-proof degree of the surface of the ardealite test piece which is not treated is higher, the mould is distributed densely, and the color is dark green.
Example 2:
selecting a phosphogypsum test piece, uniformly coating the mould-proof coating sample prepared in the example 1 on the test piece by adopting a rolling brush coating mode at an angle of 45 degrees with the long edge of the test piece, in the rolling coating process, covering and infiltrating rough and uneven particles on the surface of the phosphogypsum test piece by the coating, infiltrating the rough and uneven particles into gaps, fully adhering the rough and uneven particles to the surface of the phosphogypsum, and naturally drying the rough and uneven particles under natural conditions to form the mould-proof and bacteria-inhibiting coating.
After 28 days, a comparison was made with the control group in example 1. The experimental result shows that no mould trace is found on the surface of the ardealite test piece coated with the mould-proof coating, and the mould-proof rate reaches 100%.
Example 3:
the reagents and drugs used below were dispensed in weight percent in the formulation based on a total weight of 200 g.
Firstly, weighing 20g of calcium hydroxide, grinding, sieving by a 1000-mesh sieve, adding into a glass container, adding 40g of pure water under a stirring state, stirring for 20min, and obtaining the solution after the solution is in an opaque state;
secondly, adding 10g of hydrophobic agent (polydimethylsiloxane) into the emulsion containing the calcium hydroxide under the stirring state, and stirring for 10min to uniformly disperse the hydrophobic agent in the emulsion;
thirdly, grinding 68g of calcium carbonate in percentage by weight in a ball mill, sieving with a 1000-mesh sieve, then adding the 1000-mesh calcium carbonate particles into the emulsion in the second step at one time under a slowly stirring state, and stirring at a high speed for 20min after all the calcium carbonate particles are added;
fourthly, adding 50g of epoxy resin in percentage by weight, heating the mixture to 30 ℃ in a water bath, and stirring the mixture for 30min at constant temperature;
and fifthly, sequentially adding 10g of curing agent (650 g of low molecular weight polyamide) and 2g of defoaming agent (mineral oil defoaming agent) and stirring for 10min to obtain a finished product of the mildewproof coating.
Selecting two phosphogypsum test pieces, wherein one of the two phosphogypsum test pieces is coated with the finished product prepared by the method by adopting a rolling brush coating mode, the finished product is uniformly coated on the long side of the test piece at an angle of 90 degrees, and in the rolling coating process, the coating covers and infiltrates rough and uneven particles on the surface of the phosphogypsum test piece, the rough and uneven particles are infiltrated into gaps and are fully attached to the surface of the phosphogypsum test piece, and then the coating is naturally dried under natural conditions to form the mildew-proof and bacteriostatic coating. And the other phosphogypsum test piece is not treated and is taken as a control group.
Two phosphogypsum test pieces are placed in the same environment, and the results are compared after 28 days. Experimental results show that mould traces are not found on the surface of the ardealite test piece coated with the mould-proof coating, the mould-proof rate reaches 100%, and the mould-proof degree of the surface of the ardealite test piece which is not treated is higher, which is mainly shown in that the mould is distributed densely, and the color is dark green.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (10)
1. The mildew-proof coating material for the phosphogypsum building material is characterized by comprising the following raw materials in percentage by weight: 20 to 40 percent of filler, 25 to 30 percent of epoxy resin, 15 to 25 percent of pure water, 10 to 15 percent of calcium hydroxide, 5 to 10 percent of hydrophobic agent, 4 to 6 percent of curing agent and 1 to 2 percent of defoaming agent.
2. The mould-proof coating material for phosphogypsum building materials as claimed in claim 1, wherein the epoxy resin is epoxy resin E-44 with an epoxy value of 0.41-0.47.
3. The mildew-resistant coating material for phosphogypsum building materials as claimed in claim 1, wherein the filler is 1000 mesh calcium carbonate particles.
4. The mould proof coating material for phosphogypsum building materials according to claim 1, wherein the hydrophobic agent is polydimethylsiloxane.
5. The mildew-proof coating material for ardealite building materials according to claim 1, wherein the curing agent is 650 low molecular weight polyamide.
6. A preparation method of a mildew-proof coating material for ardealite building materials comprises the following steps:
firstly, adding 10-15 parts by weight of filler into a container, and then adding 15-25 parts by weight of pure water into a reaction kettle to be stirred and dissolved;
secondly, adding 5-10 parts by weight of hydrophobing agent into the reaction kettle and stirring the mixture under the stirring state;
step three, grinding 20-40 parts by weight of filler in a ball mill, sieving with a 1000-mesh sieve, adding into the reaction kettle in the step two, and stirring;
fourthly, adding 25 to 30 weight parts of epoxy resin, and stirring at constant temperature when heating to 30 ℃ in a water bath;
and step five, sequentially adding 4-6 parts by weight of curing agent and 1-2 parts by weight of defoaming agent and stirring to obtain the coating material.
7. The preparation method of the mould-proof coating material for phosphogypsum building materials according to claim 1, wherein the epoxy resin is epoxy resin E-44 with an epoxy value of 0.41-0.47.
8. The method for preparing the mildewproof coating material for the phosphogypsum building material according to claim 1, wherein the hydrophobic agent is polydimethylsiloxane.
9. The method for preparing the mildewproof coating material for the phosphogypsum building material according to claim 1, wherein the filler is calcium carbonate particles with the size of 1000 meshes.
10. The method for preparing the mildewproof coating material for the phosphogypsum building material according to claim 1, wherein the curing agent is 650 low-molecular polyamide.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211310574.XA CN115838558A (en) | 2022-10-25 | 2022-10-25 | Mildew-proof coating material for phosphogypsum building material |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211310574.XA CN115838558A (en) | 2022-10-25 | 2022-10-25 | Mildew-proof coating material for phosphogypsum building material |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116285670A (en) * | 2023-03-28 | 2023-06-23 | 贵州大学 | Preparation method of beta-semi-hydrated phosphogypsum surface hybridization nano silicon dioxide hydrophobic self-cleaning coating |
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Patent Citations (7)
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| CN102212247A (en) * | 2011-04-29 | 2011-10-12 | 宏昌电子材料股份有限公司 | Aqueous epoxy resin composition and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116285670A (en) * | 2023-03-28 | 2023-06-23 | 贵州大学 | Preparation method of beta-semi-hydrated phosphogypsum surface hybridization nano silicon dioxide hydrophobic self-cleaning coating |
| CN116285670B (en) * | 2023-03-28 | 2023-08-29 | 贵州大学 | Preparation method of beta-semi-hydrated phosphogypsum surface hybridization nano silicon dioxide hydrophobic self-cleaning coating |
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