CN115838558A - Mildew-proof coating material for phosphogypsum building material - Google Patents

Abstract

The invention discloses a mold-proof coating material used for phosphogypsum building materials, which belongs to the field of building materials. An anti-mildew coating material for phosphogypsum building materials, prepared by weight percentage from the following components: 20-40% filler (calcium carbonate), 25-30% epoxy resin, 15-25% pure water, 10- 15% calcium hydroxide, 5-10% hydrophobic agent (polydimethylsiloxane), 4-6% curing agent (650 low-molecular polyamide), 1-2% defoamer; the invention also discloses a A preparation method of the antifungal coating. The calcium hydroxide added in the anti-mildew coating of the present invention not only has strong antibacterial ability, but also can neutralize the acidic environment of phosphogypsum building materials, and at the same time, it is added to make it difficult for the moisture in the external environment to penetrate into the anti-mildew coating The hydrophobic agent of the phosphogypsum building material of the coating, so the antimold mechanism of the mildew-proof coating prepared by the present invention is to solve the mildew problem of the phosphogypsum building material from three aspects of physics, chemistry and biology, and can play a good role in the phosphogypsum building material. protective effect.

Description

A kind of antifungal coating material for phosphogypsum building material

technical field

The invention relates to the field of building materials, in particular to an anti-mildew coating material for phosphogypsum building materials.

Background technique

Mildew of phosphogypsum building materials means that the residual phosphate in phosphogypsum will create a weakly acidic environment under the condition of high air humidity, which will lead to the growth and reproduction of mold suitable for this environment. If such a situation occurs for a long time, it will not only cause immeasurable consequences to the building materials themselves, but also seriously endanger the physical and mental health of the human body. Therefore, how to inhibit and kill the mold by destroying the biological structure of the mold, or changing the suitable conditions and environment required for the growth of the mold is a major problem that needs to be solved urgently for the large-scale production and application of phosphogypsum building materials.

Coating is a solid film obtained after uniform coating and curing of paint on the surface of an object, which can isolate the coated object from direct contact with the external environment, and play the role of protection, insulation, and appearance modification. Coating on the surface of building materials is a simple and low-cost measure. It can not only effectively cover the potholes on the surface of building materials to improve the appearance, but also repair the damaged parts of the original coating at any time. It's just that when the coated building material is corroded by mold, the traditional coating cannot prevent mold from growing and multiplying on the surface of the building material.

Contents of the invention

Aiming at the deficiencies of the prior art, the invention proposes a mildew-resistant coating material for phosphogypsum building materials.

The purpose of the present invention can be achieved through the following technical solutions:

An anti-mildew coating material for phosphogypsum building materials, comprising raw materials including the following ingredients in weight percentage: 20-40% filler, 25-30% epoxy resin, 15-25% pure water, 10-15% hydrogen oxide Calcium, 5-10% hydrophobic agent, 4-6% curing agent, 1-2% defoamer.

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 for an anti-mildew coating material for phosphogypsum building materials, comprising the following steps:

Step 1: Add 10-15 parts by weight of filler into the container, then add 15-25 parts by weight of pure water into the reaction kettle and stir to dissolve;

In the second step, under stirring, add 5 to 10 parts by weight of hydrophobic agent into the reaction kettle and stir;

In the third step, 20-40 parts by weight of the filler are ground in a ball mill, passed through a 1000-mesh sieve, added to the reaction kettle in the second step, and stirred;

The fourth step is to add 25-30 parts by weight of epoxy resin, and stir at a constant temperature when the water bath is heated to 30°C;

In the fifth step, 4-6 parts by weight of curing agent and 1-2 parts by weight of defoamer are added in sequence and stirred 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.

Beneficial effects of the present invention:

The main components in the antifungal coating of the present invention include epoxy resin E-44 and calcium hydroxide. Epoxy resin E-44 has extremely strong adhesion and adhesion strength after curing, not only can make the coating closely bond with the surface of phosphogypsum building materials, but also can isolate the contact between phosphogypsum building materials and external air, making the aerobic type Mold cannot grow on the surface of phosphogypsum building materials. At the same time, calcium hydroxide is an alkaline substance, which can neutralize the acid and alkali in the weakly acidic environment of phosphogypsum, so that the growth of mold lacks the necessary acidic conditions. Moreover, calcium hydroxide can also denature the protein of microorganisms, thereby achieving the effect of inhibiting or even killing mold.

In the antifungal coating of the present invention, polydimethylsiloxane is also added as a hydrophobic agent. Its function is to form a special water drop on the surface of the coating by changing the contact angle between the water droplet and the coating surface after the coating is cured. The waterproof structure makes the surface of the coating have good waterproof and hydrophobic effects. Because the growth of mold requires suitable external conditions, such as temperature, air humidity, oxygen, etc., and under the action of hydrophobic agent, it is difficult for the moisture in the external environment to penetrate into the phosphogypsum building materials coated with anti-mold coating, reducing mold The possibility of massive growth and reproduction on the surface of building materials.

Generally speaking, the bacteriostatic effect of the antifungal coating of the present invention proceeds from three aspects of physics, chemistry, and biology, and has an extremely close synergistic effect. application prospects.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings.

Fig. 1 is the flow chart of the preparation method of the present application.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Example 1:

The following reagents and medicines are based on the total weight of 200g, and are distributed according to the weight percentage in the formula.

The first step is to weigh 30g of calcium hydroxide for grinding, pass through a 1000-mesh sieve, and then add it to a glass container, then add 40g of pure water under stirring, and stir for 20 minutes until the solution becomes milky;

The second step, under stirring, add 10g of hydrophobic agent (polydimethylsiloxane) to the emulsion containing calcium hydroxide and stir for 10min to make it evenly dispersed in the emulsion;

In the third step, after grinding 58g of calcium carbonate in a ball mill, pass through a 1000-mesh sieve, and then add 1000-mesh calcium carbonate particles into the emulsion in the second step at one time under the state of slow stirring, and carry out after all the addition is completed. Stir at high speed for 20 minutes;

The fourth step is to add 50g of epoxy resin, and when the water bath is heated to 30°C, stir at constant temperature for 30min;

Step 5: Add 10 g of curing agent (650 low-molecular polyamide) and 2 g of defoamer (mineral oil defoamer) in sequence and stir for 10 minutes to obtain the finished product of the mildew-resistant coating.

Select two phosphogypsum test pieces, one of which is coated with the finished product made by the above method at an angle of 90° to the long side of the test piece by rolling brush coating. The rough and uneven particles on the surface of the gypsum test piece cover, infiltrate, and penetrate into the gaps, fully adhere to the surface of the phosphogypsum, and then dry naturally under natural conditions to become an anti-mildew and anti-bacterial coating. The other phosphogypsum specimen was not treated, and it was used as a control group.

Place two phosphogypsum specimens in the same environment, and compare the results after 28 days. The experimental results show that no trace of mold is found on the surface of the phosphogypsum specimen coated with anti-mildew coating, and the anti-mildew rate reaches 100%. , rendered in dark green color.

Example 2:

Select a piece of phosphogypsum test piece, and apply the anti-mold coating sample prepared by the above example 1 to the long side of the test piece at an angle of 45° by means of roller brush coating. The rough and uneven particles on the surface of the phosphogypsum specimen cover, infiltrate, and infiltrate into the gaps, fully adhere to the surface of the phosphogypsum, and then dry naturally under natural conditions to become an anti-mold and antibacterial coating.

After 28 days, it was compared with the control group in Example 1. The experimental results show that no trace of mold is found on the surface of the phosphogypsum specimen coated with the anti-mold coating, and the anti-mold rate reaches 100%.

Example 3:

The following reagents and medicines are based on the total weight of 200g, and are distributed according to the weight percentage in the formula.

The first step is to weigh 20g of calcium hydroxide for grinding, pass through a 1000-mesh sieve, and then add it to a glass container, then add 40g of pure water under stirring, and stir for 20 minutes until the solution becomes milky;

In the second step, under stirring, add 10 g of hydrophobic agent (polydimethylsiloxane) to the emulsion containing calcium hydroxide and stir for 10 minutes to make it uniformly dispersed in the emulsion;

Step 3: After grinding 68g of calcium carbonate by weight in a ball mill, pass through a 1000-mesh sieve, and then add 1000-mesh calcium carbonate particles to the emulsion in the second step at one time while stirring slowly, and wait until all are added After completion, high-speed stirring was carried out for 20 minutes;

The fourth step is to add 50g of epoxy resin in weight percentage, and when the water bath is heated to 30°C, stir at constant temperature for 30min;

Step 5: Add 10 g of curing agent (650 low-molecular polyamide) and 2 g of defoamer (mineral oil defoamer) in sequence and stir for 10 minutes to obtain the finished mold-proof coating.

Select two phosphogypsum test pieces, one of which is coated with the finished product made by the above method at an angle of 90° to the long side of the test piece by rolling brush coating. The rough and uneven particles on the surface of the gypsum test piece cover, infiltrate, and penetrate into the gaps, fully adhere to the surface of the phosphogypsum, and then dry naturally under natural conditions to become an anti-mildew and anti-bacterial coating. The other phosphogypsum specimen was not treated, and it was used as a control group.

Place two phosphogypsum specimens in the same environment, and compare the results after 28 days. The experimental results show that no trace of mold is found on the surface of the phosphogypsum specimen coated with anti-mildew coating, and the anti-mildew rate reaches 100%. , rendered in dark green color.

In the description of this specification, descriptions with reference to the terms "one embodiment", "example", "specific example" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment of the present invention. In an embodiment or example. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. What are described in the above-mentioned embodiments and the description only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Variations and improvements are possible, which fall within the scope of the claimed invention.

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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