CN114316730A - Acid-resistant water-based epoxy floor paint and preparation method thereof - Google Patents

Abstract

The invention relates to the technical field of building decoration materials, in particular to acid-resistant water-based epoxy floor paint which comprises, by weight, 20-40 parts of water-based epoxy resin, 5-15 parts of a water-based epoxy curing agent, 8-15 parts of modified graphene oxide, 5-20 parts of nano zinc oxide, 2-4 parts of fumed silica, 35-60 parts of a filler, 5-25 parts of a pigment and a filler, 1-3 parts of a defoaming agent, 2-8 parts of a plasticizer, 10-25 parts of a toughening agent and 5-35 parts of water; the waterborne epoxy curing agent is an aromatic amine curing agent, and the modified graphene oxide is one of KH-550 modified graphene oxide or diisocyanate grafted modified graphene oxide; also provides a preparation method thereof. The invention improves the acid resistance, the binding power and the mechanical property of the water-based epoxy floor paint, and is beneficial to promoting the application and the development of the graphene oxide in the water-based epoxy floor paint.

Description

Acid-resistant water-based epoxy floor paint and preparation method thereof

Technical Field

The invention relates to the technical field of building decoration materials, in particular to acid-resistant water-based epoxy floor paint and a preparation method thereof.

Background

The water-based epoxy floor coating is environment-friendly, healthy, easy to clean and scrub, slightly acid-alkali resistant, and good in mildew-proof and bacteria-proof effects; the waterproof paint is micro-breathable, resistant to underground water vapor, easy to construct, seamless and dustproof; the coating is hard and wear-resistant and is suitable for medium load; soft luster, beautiful appearance and the like, and is developed rapidly in China. And with the increase of the living quality requirements of people and the restriction of related laws and regulations, the waterborne epoxy floor coating is bound to become one of the development trends in the future market.

However, with the wider application range of the water-based epoxy floor coating, the application environment is more and more complex, and the micro acid and alkali resistance cannot meet the practical requirement, so that research and development on the acid and alkali resistance of the water-based epoxy floor coating still have practical significance.

Compared with graphene, although the mechanical property and the conductivity of graphene oxide are reduced, the graphene oxide has excellent compatibility with organic resin due to a large number of oxygen-containing functional groups on the surface of a graphene oxide sheet layer, can be stably dispersed in the organic resin, can fully play the role of the graphene oxide as a reinforcing phase in continuous phase resin, and can effectively improve the acid and alkali resistance of epoxy resin due to the fact that the graphene oxide is doped into epoxy resin because the graphene oxide has a large specific surface area and an expanded space sheet structure, so that the graphene oxide has a good application prospect in the field of coatings. However, the graphene oxide surface has more hydrophilic functional groups which are easy to agglomerate after being dried, thereby limiting the application and development of the graphene oxide to a certain extent.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide the acid-resistant water-based epoxy floor paint which is good in acid resistance, simple in components, safe and environment-friendly. In order to realize the purpose of the invention, the following technical scheme is adopted:

an acid-resistant water-based epoxy floor paint comprises, by weight, 20-40 parts of water-based epoxy resin, 5-15 parts of a water-based epoxy curing agent, 8-15 parts of modified graphene oxide, 5-20 parts of nano zinc oxide, 2-4 parts of fumed silica, 35-60 parts of a filler, 5-25 parts of a pigment and a filler, 1-3 parts of a defoaming agent, 2-8 parts of a plasticizer, 10-25 parts of a toughening agent and 5-35 parts of water;

the waterborne epoxy curing agent is an aromatic amine curing agent, and the modified graphene oxide is one of KH-550 modified graphene oxide or diisocyanate grafted modified graphene oxide.

Preferably, the preparation method of the KH-550 modified graphene oxide comprises the following steps:

1) preparing a graphene oxide solution: putting graphene oxide into a beaker, adding absolute ethyl alcohol, stirring and uniformly dispersing by ultrasonic to obtain a graphene oxide dispersion liquid;

2) preparing KH-550 solution: putting KH-550 and absolute ethyl alcohol into a beaker, and uniformly stirring to obtain a KH-550 solution;

3) preparing KH-550 modified graphene oxide: adding the KH-550 solution obtained in the step 2) into the graphene oxide dispersion liquid obtained in the step 1), reacting at 50-70 ℃ for 18-24h, and then separating, washing and drying to obtain the KH-550 modified graphene oxide.

Preferably, the preparation method of the diisocyanate grafted and modified graphene oxide comprises the following steps:

(a) preparing a graphene oxide solution: dispersing graphene oxide in dimethylformamide to obtain a graphene oxide dispersion liquid;

(b) preparation of diisocyanate solution: dispersing diisocyanate in dimethylformamide to obtain a diisocyanate dispersion liquid;

(c) preparing diisocyanate grafted modified graphene oxide: and (b) mixing the graphene oxide dispersion liquid obtained in the step (a) and the diisocyanate dispersion liquid obtained in the step (b) in a nitrogen atmosphere, and reacting at 90-100 ℃ for 24-48h to obtain the diisocyanate grafted modified graphene oxide.

Preferably, the filler is one or more of bentonite, ground calcium carbonate and talcum powder.

Preferably, the pigment and filler is one of pearl powder, titanium dioxide or lithopone.

Preferably, the defoamer is a hydrophilic defoamer.

Preferably, the plasticizer is one of epoxy fatty acid methyl ester or bismaleimide.

Preferably, the toughening agent is one of amino nitrile rubber or polysulfide rubber.

In order to achieve the purpose, the invention also provides a preparation method of the acid-resistant water-based epoxy floor paint, which comprises the following steps:

(1) preparing modified graphene oxide: self-made modified graphene oxide for later use;

(2) high-speed stirring: weighing a certain amount of waterborne epoxy resin, modified graphene oxide, nano zinc oxide and gas-phase white carbon black in a stirring container according to a formula, uniformly stirring at the rotating speed of 400-600r/min, adding a certain amount of filler and pigment filler, adding a proper amount of defoaming agent, and uniformly stirring;

(3) low-speed film forming: the rotation speed is adjusted to be 100-200r/min, and according to the formula, the waterborne epoxy curing agent, the plasticizer, the toughening agent and a proper amount of water are added and stirred for a certain time to prepare the acid-resistant waterborne epoxy floor paint.

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

the acid-resistant water-based epoxy floor paint disclosed by the invention adopts the aromatic amine curing agent, so that the acid resistance of the water-based epoxy floor paint is improved to a certain extent; the modified graphene oxide with high mechanical strength, compact structure, strong physical shielding property and large specific surface area is adopted, so that the mechanical property of the water-based epoxy floor paint is improved, the interlayer spacing of graphene oxide functional groups is obviously increased by the modified graphene oxide, the crystallinity is weakened, the aggregation and stacking among graphene sheet layers are avoided, the dispersion of the graphene sheet layers in a water-based epoxy coating is facilitated, and the acid resistance of the water-based epoxy floor paint is greatly improved; and the plasticizer and the toughening agent are added, so that the binding power, the mechanical property and the acid resistance of the water-based epoxy floor paint are further improved, and the application and the development of the graphene oxide in the water-based epoxy floor paint are facilitated.

Drawings

FIG. 1 is a flow chart of a method for preparing acid-resistant water-based epoxy floor paint according to the present invention;

FIG. 2 is a flow chart of a preparation method of KH-550 modified graphene oxide according to the present invention;

FIG. 3 is a flow chart of a preparation method of diisocyanate graft modified graphene oxide according to the present invention;

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.

Detailed description of the preferred embodiment 1

In the embodiment, the specific formula comprises the following components in parts by weight:

aqueous epoxy resin	20 portions of
		Aqueous epoxy curing agent	5 portions of
Modified graphene oxide	8 portions of
		Nano zinc oxide	5 portions of
Fumed silica	2 portions of
		Filler material	35 portions of
Pigment and filler	5 portions of
		Defoaming agent	1 part of
Plasticizer	2 portions of
		Toughening agent	10 portions of
Water (W)	5 portions of

Wherein the waterborne epoxy curing agent is an aromatic amine curing agent, and the modified graphene oxide is KH-550 modified graphene oxide; the filler is bentonite; the pigment and the filler are pearl powder; the defoaming agent is a hydrophilic defoaming agent; the plasticizer is epoxy fatty acid methyl ester; the toughening agent is amido nitrile rubber.

Fig. 2 is a flow chart of a preparation method of KH-550 modified graphene oxide in the present invention, and it can be seen that the preparation method of KH-550 modified graphene oxide is as follows:

step S101: preparing a graphene oxide solution: putting graphene oxide into a beaker, adding absolute ethyl alcohol, stirring and uniformly dispersing by ultrasonic to obtain a graphene oxide dispersion liquid;

step S102: preparing KH-550 solution: putting KH-550 and absolute ethyl alcohol into a beaker, and uniformly stirring to obtain a KH-550 solution;

step S103: preparing KH-550 modified graphene oxide: and (3) adding the KH-550 solution obtained in the step (S102) into the graphene oxide dispersion liquid obtained in the step (S101), reacting for 24 hours at 50 ℃, and then separating, washing and drying to obtain the KH-550 modified graphene oxide.

FIG. 1 is a flow chart of a preparation method of the acid-resistant water-based epoxy floor paint, and the specific preparation method of the embodiment is as follows:

step S1: preparing modified graphene oxide: self-made modified graphene oxide for later use;

step S2: high-speed stirring: weighing a certain amount of waterborne epoxy resin, modified graphene oxide, nano zinc oxide and gas-phase white carbon black in a stirring container according to a formula, uniformly stirring at a rotating speed of 400r/min, adding a certain amount of filler and pigment filler, adding a proper amount of defoaming agent, and uniformly stirring;

step S3: low-speed film forming: adjusting the rotating speed to 100r/min, adding the waterborne epoxy curing agent, the plasticizer, the toughening agent and a proper amount of water according to the formula, stirring for a certain time to prepare the acid-resistant waterborne epoxy floor paint, and detecting the correlation performance.

Specific example 2

In the embodiment, the specific formula comprises the following components in parts by weight:

aqueous epoxy resin	40 portions of
		Aqueous epoxy curing agent	15 portions of
Modified graphene oxide	15 portions of
		Nano zinc oxide	20 portions of
Fumed silica	4 portions of
		Filler material	60 portions of
Pigment and filler	25 portions of
		Defoaming agent	3 portions of
Plasticizer	8 portions of
		Toughening agent	25 portions of
Water (W)	35 portions of

The waterborne epoxy curing agent is an aromatic amine curing agent, and the modified graphene oxide is diisocyanate grafted modified graphene oxide; the filler is a mixture of heavy calcium carbonate and talcum powder; the pigment and filler is titanium dioxide; the defoaming agent is a hydrophilic defoaming agent; the plasticizer is bismaleimide; the toughening agent is polysulfide rubber.

Fig. 3 is a flow chart of a preparation method of the diisocyanate graft-modified graphene oxide according to the present invention, and it can be seen that the preparation method of the diisocyanate graft-modified graphene oxide comprises:

step S111: preparing a graphene oxide solution: dispersing graphene oxide in dimethylformamide to obtain a graphene oxide dispersion liquid;

step S112: preparation of diisocyanate solution: dispersing diisocyanate in dimethylformamide to obtain a diisocyanate dispersion liquid;

step S113: preparing diisocyanate grafted modified graphene oxide: and (3) mixing the graphene oxide dispersion liquid obtained in the step (S111) and the diisocyanate dispersion liquid obtained in the step (S112) in a nitrogen atmosphere, and reacting at 90 ℃ for 48 hours to obtain the diisocyanate grafted and modified graphene oxide.

FIG. 1 is a flow chart of a preparation method of the acid-resistant water-based epoxy floor paint, and the specific preparation method of the embodiment is as follows:

step S1: preparing modified graphene oxide: self-made modified graphene oxide for later use;

step S2: high-speed stirring: weighing a certain amount of waterborne epoxy resin, modified graphene oxide, nano zinc oxide and gas-phase white carbon black in a stirring container according to a formula, uniformly stirring at a rotating speed of 600r/min, adding a certain amount of filler and pigment filler, adding a proper amount of defoaming agent, and uniformly stirring;

step S3: low-speed film forming: regulating the rotating speed to 200r/min, adding a water-based epoxy curing agent, a plasticizer, a toughening agent and a proper amount of water according to the formula, stirring for a certain time to prepare the acid-resistant water-based epoxy floor paint, and detecting the correlation performance.

Specific example 3

In the embodiment, the specific formula comprises the following components in parts by weight:

aqueous epoxy resin	30 portions of
		Aqueous epoxy curing agent	10 portions of
Modified graphene oxide	12 portions of
		Nano zinc oxide	15 portions of
Fumed silica	3 portions of
		Filler material	45 portions of
Pigment and filler	15 portions of
		Defoaming agent	2 portions of
Plasticizer	4 portions of
		Toughening agent	15 portions of
Water (W)	20 portions of

Wherein the waterborne epoxy curing agent is an aromatic amine curing agent, and the modified graphene oxide is KH-550 modified graphene oxide; the filler is talcum powder; the pigment and filler is lithopone; the defoaming agent is a hydrophilic defoaming agent; the plasticizer is epoxy fatty acid methyl ester; the toughening agent is polysulfide rubber.

Fig. 2 is a flow chart of a preparation method of KH-550 modified graphene oxide in the present invention, and it can be seen that the preparation method of KH-550 modified graphene oxide is as follows:

step S101: preparing a graphene oxide solution: putting graphene oxide into a beaker, adding absolute ethyl alcohol, stirring and uniformly dispersing by ultrasonic to obtain a graphene oxide dispersion liquid;

step S102: preparing KH-550 solution: putting KH-550 and absolute ethyl alcohol into a beaker, and uniformly stirring to obtain a KH-550 solution;

step S103: preparing KH-550 modified graphene oxide: and (3) adding the KH-550 solution obtained in the step (S102) into the graphene oxide dispersion liquid obtained in the step (S101), reacting at 70 ℃ for 18h, and then separating, washing and drying to obtain the KH-550 modified graphene oxide.

FIG. 1 is a flow chart of a preparation method of the acid-resistant water-based epoxy floor paint, and the specific preparation method of the embodiment is as follows:

step S1: preparing modified graphene oxide: self-made modified graphene oxide for later use;

step S2: high-speed stirring: weighing a certain amount of waterborne epoxy resin, modified graphene oxide, nano zinc oxide and gas-phase white carbon black in a stirring container according to a formula, uniformly stirring at a rotating speed of 500r/min, adding a certain amount of filler and pigment filler, adding a proper amount of defoaming agent, and uniformly stirring;

step S3: low-speed film forming: adjusting the rotating speed to 100r/min, adding the waterborne epoxy curing agent, the plasticizer, the toughening agent and a proper amount of water according to the formula, stirring for a certain time to prepare the acid-resistant waterborne epoxy floor paint, and detecting the correlation performance.

The detection results are as follows:

TABLE 1 results of testing the properties of the examples

As can be seen from the above embodiments of the present invention, the acid-resistant water-based epoxy floor paint of the present invention employs an aromatic amine curing agent, which improves the acid resistance of the water-based epoxy floor paint to a certain extent; the modified graphene oxide with high mechanical strength, compact structure, strong physical shielding property and large specific surface area is adopted, so that the mechanical property of the water-based epoxy floor paint is improved, the interlayer spacing of graphene oxide functional groups is obviously increased by the modified graphene oxide, the crystallinity is weakened, the aggregation and stacking among graphene sheet layers are avoided, the dispersion of the graphene sheet layers in a water-based epoxy coating is facilitated, and the acid resistance of the water-based epoxy floor paint is greatly improved; and the plasticizer and the toughening agent are added, so that the binding power, the mechanical property and the acid resistance of the water-based epoxy floor paint are further improved, and the application and the development of the graphene oxide in the water-based epoxy floor paint are facilitated.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can understand that the changes or modifications within the technical scope of the present invention are included in the scope of the present invention, and therefore, the scope of the present invention should be subject to the protection scope of the claims.

Claims (9)

1. The acid-resistant water-based epoxy floor paint is characterized in that: the coating comprises, by weight, 20-40 parts of waterborne epoxy resin, 5-15 parts of waterborne epoxy curing agent, 8-15 parts of modified graphene oxide, 5-20 parts of nano zinc oxide, 2-4 parts of fumed silica, 35-60 parts of filler, 5-25 parts of pigment and filler, 1-3 parts of defoaming agent, 2-8 parts of plasticizer, 10-25 parts of toughening agent and 5-35 parts of water;

the waterborne epoxy curing agent is an aromatic amine curing agent, and the modified graphene oxide is one of KH-550 modified graphene oxide or diisocyanate grafted modified graphene oxide.

2. The acid-resistant water-based epoxy floor paint as claimed in claim 1, wherein: the preparation method of the KH-550 modified graphene oxide comprises the following steps:

1) preparing a graphene oxide solution: putting graphene oxide into a beaker, adding absolute ethyl alcohol, stirring and uniformly dispersing by ultrasonic to obtain a graphene oxide dispersion liquid;

2) preparing KH-550 solution: putting KH-550 and absolute ethyl alcohol into a beaker, and uniformly stirring to obtain a KH-550 solution;

3) preparing KH-550 modified graphene oxide: adding the KH-550 solution obtained in the step 2) into the graphene oxide dispersion liquid obtained in the step 1), reacting at 50-70 ℃ for 18-24h, and then separating, washing and drying to obtain the KH-550 modified graphene oxide.

3. The acid-resistant water-based epoxy floor paint as claimed in claim 1, wherein: the preparation method of the diisocyanate grafted modified graphene oxide comprises the following steps:

(a) preparing a graphene oxide solution: dispersing graphene oxide in dimethylformamide to obtain a graphene oxide dispersion liquid;

(b) preparation of diisocyanate solution: dispersing diisocyanate in dimethylformamide to obtain a diisocyanate dispersion liquid;

(c) preparing diisocyanate grafted modified graphene oxide: and (b) mixing the graphene oxide dispersion liquid obtained in the step (a) and the diisocyanate dispersion liquid obtained in the step (b) in a nitrogen atmosphere, and reacting at 90-100 ℃ for 24-48h to obtain the diisocyanate grafted modified graphene oxide.

4. The acid-resistant water-based epoxy floor paint as claimed in claim 1, wherein: the filler is one or more of bentonite, ground calcium carbonate and talcum powder.

5. The acid-resistant water-based epoxy floor paint as claimed in claim 1, wherein: the pigment filler is one of pearl powder, titanium dioxide or lithopone.

6. The acid-resistant water-based epoxy floor paint as claimed in claim 1, wherein: the defoaming agent is a hydrophilic defoaming agent.

7. The acid-resistant water-based epoxy floor paint as claimed in claim 1, wherein: the plasticizer is one of epoxy fatty acid methyl ester or bismaleimide.

8. The acid-resistant water-based epoxy floor paint as claimed in claim 1, wherein: the toughening agent is one of amido nitrile rubber or polysulfide rubber.

9. The preparation method of the acid-resistant water-based epoxy floor paint is characterized by comprising the following steps of: the method comprises the following steps:

(1) preparing modified graphene oxide: self-made modified graphene oxide for later use;

(2) high-speed stirring: weighing a certain amount of waterborne epoxy resin, modified graphene oxide, nano zinc oxide and gas-phase white carbon black in a stirring container according to a formula, uniformly stirring at the rotating speed of 400-600r/min, adding a certain amount of filler and pigment filler, adding a proper amount of defoaming agent, and uniformly stirring;

(3) low-speed film forming: the rotation speed is adjusted to be 100-200r/min, and according to the formula, the waterborne epoxy curing agent, the plasticizer, the toughening agent and a proper amount of water are added and stirred for a certain time to prepare the acid-resistant waterborne epoxy floor paint.

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