CN110819178A

CN110819178A - Environment-friendly coating, preparation method, application and use method

Info

Publication number: CN110819178A
Application number: CN201810896695.4A
Authority: CN
Inventors: 高双之; 闪晓刚; 李继华; 夏志宇; 宁炜; 张荔; 陈守乾
Original assignee: Langfang Nippon Paint Co Ltd
Current assignee: Langfang Nippon Paint Co Ltd
Priority date: 2018-08-08
Filing date: 2018-08-08
Publication date: 2020-02-21

Abstract

The invention belongs to the field of coatings, and particularly relates to an environment-friendly coating, a preparation method, application and a use method thereof, wherein the environment-friendly coating comprises a liquid component A and a reinforcing agent component B which are independently packaged, and the environment-friendly coating comprises the following raw materials in parts by mass: the liquid component a comprises: water: 20-30 parts of emulsion: 30-60 parts of defoaming agent: 0.05-0.3 part of film forming additive: 0.5-3 parts of a thickening agent: 0.2-1 part of water for adjusting viscosity: 1-5 parts of a reinforcing agent component B, wherein the reinforcing agent component B comprises: silicate and/or silica sol: 10-30 parts. The environment-friendly coating has the beneficial effects that the environment-friendly coating is divided into the liquid component A and the reinforcing agent component B which are packaged independently, so that the effective components in the liquid component can exist more stably in the liquid, the storage time of the environment-friendly coating is prolonged, and the problem that the environment-friendly coating containing the components cannot be produced in batches and stored for a long time is solved.

Description

Environment-friendly coating, preparation method, application and use method

Technical Field

The invention belongs to the field of coatings, and particularly relates to an environment-friendly coating, a preparation method, application and a use method.

Background

Along with the continuous improvement of the building and decoration effects of the outer wall, the requirement of the building coating is also increased. Different from the traditional external wall body, the building external wall plate (such as a heat-preservation decorative plate) has a compact surface, and the traditional building coating is difficult to permeate on the surface and is easy to cause poor adhesion.

At present, fiber cement boards are mostly adopted as base materials for exterior wall building decorative boards, and coating paint is adopted for decoration to imitate the marble effect. The coating can be divided into a one-component coating and a two-component coating. The single-component coating generally does not need crosslinking and curing, and can form a paint film only by solvent volatilization (belonging to physical reaction); the two-component coating is generally cross-linked and cured, and the two components are mixed to generate a cross-linking reaction to form a paint film (belonging to a chemical reaction). The fiber cement board has high density and loose surface layer. The double-component water-based epoxy resin coating can be adopted, and the film is formed by utilizing the cross-linking reaction of hydroxyl and epoxy in the molecular chain of the epoxy resin, so that the double-component water-based epoxy resin coating has better adhesive force. However, the aqueous epoxy resin coating has the following problems: 1. the functional group crosslinking reaction of the epoxy coating needs to be carried out at a certain temperature, and when the temperature is lower, the reaction is slow, and even a film cannot be formed; 2. epoxy coatings have a fast rise in overall viscosity and cure readily, requiring production equipment cleaning within a short time interval to prevent resin curing during production.

The emulsion such as styrene-acrylic emulsion, pure acrylic emulsion or silicone-acrylic emulsion of the single-component coating is adopted as a film forming substance, and the emulsion has larger particle size, so that the adhesion is poor due to poor permeability on the surface of a compact fiber cement board, but the water resistance is good after film forming. The single-component coating can be prepared by adopting the components added with the reinforcing agent, but the prepared single-component coating is very unstable, and the single-component coating can not be produced in batch because the storage time is less than 7 days when the heat storage temperature is 55 ℃.

The present invention has been made in view of this situation.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides an environment-friendly coating, a preparation method, an application and a use method.

In order to solve the technical problems, the invention adopts the technical scheme that:

the environment-friendly coating comprises a liquid component A and an enhancer component B which are independently packaged, and the environment-friendly coating comprises the following raw materials in parts by mass:

the liquid component a comprises:

the enhancer component B comprises:

10-30 parts of silicate and/or silica sol.

The liquid component A is added with the reinforcing agent component B, so that the permeability of the coating can be improved, and the adhesive force of the coating can be enhanced, but the liquid component A and the reinforcing agent component B are mixed to prepare a single-component coating, and granular substances are easily generated in the coating in a hot storage state, so that the film forming property of the coating is reduced, and the performance of the coating is greatly reduced or even cannot be used.

It has been found that the long-term presence of the reinforcing agent component B in a one-component coating tends to cause coagulation of the emulsion and precipitation of the solute in the emulsion, a physical change which is the main cause of particle formation. The environment-friendly coating is divided into the liquid component A and the reinforcing agent component B which are packaged independently, so that the effective components in the liquid component A exist more stably in the liquid, the storage time of the environment-friendly coating is prolonged, and the problem that the environment-friendly coating containing the components cannot be produced in batches is solved.

When the paint is used, the liquid component A and the reinforcing agent component B are uniformly mixed for use, and after the paint is coated, a paint film is formed by utilizing the volatilization of moisture, so that the influence of temperature is small, the film can be formed even at a lower temperature, and the limitation is small; after the two are mixed, the opening time is long, and the waste is reduced.

The viscosity of the liquid component A is 70-100 KU;

preferably, the viscosity of the liquid component a is 80 ± 5 KU.

The viscosity of the liquid component is adjusted to be in the range of 70-100KU, the painting amount in the production process can be met, and the solute in the emulsion is not easy to agglomerate by adding the reinforcing agent component B under the viscosity and the concentration; in addition, the viscosity is high, although the painting amount in the production process can be greatly improved, when the liquid component A and the reinforcing agent component B are mixed, the emulsion stability is reduced, the painting amount is high, the coating consumption is high, the range of the viscosity is lower, the painting amount in the production process is small, and the requirement of adhesive force cannot be met. Within the viscosity range, the stability of the mixed coating can be met, the good painting amount can be realized, the output power of the stirring device is moderate, and the stirring device is more energy-saving.

The emulsion comprises one or a mixture of a plurality of styrene-acrylic emulsion, pure acrylic emulsion and silicone acrylic emulsion;

preferably, the particle size of the corresponding solute in the styrene-acrylic emulsion, the pure acrylic emulsion and the silicone acrylic emulsion is 0.1-0.2 μm.

One or a plurality of styrene-acrylic emulsion, pure acrylic emulsion and silicone acrylic emulsion are mixed, crosslinking and solidification are not needed, a paint film can be formed only by solvent volatilization, the influence of temperature is small, and the film can be formed even at a lower temperature.

The defoaming agent comprises one or a mixture of mineral oil defoaming agent and organic silicon defoaming agent;

the film-forming assistant comprises one or a mixture of more of dipropylene glycol propyl ether, dipropylene glycol butyl ether and Texanol;

the thickening agent comprises one or a mixture of more of an alkali-soluble swelling thickening agent, a polyurethane thickening agent and an inorganic thickening agent.

The silicate comprises one or a mixture of more of lithium silicate, sodium silicate and potassium silicate.

The inorganic coating lithium silicate, sodium silicate and potassium silicate are molecular solutions and have the characteristics of good permeability and high hardness, the permeability and the adhesion of the coating are improved by adding the substances into the liquid component A, and the hardness after film formation is high, so that the defects of poor permeability, low hardness and poor adhesion of the liquid component A are overcome, the substances complement each other, and the performance of the coating is improved.

A preparation method of the environment-friendly coating,

adding other components in the liquid component A into water, mixing to obtain a liquid mixture A, adding water to adjust the viscosity of the liquid mixture A to 70-100KU, and packaging to obtain an independently packaged liquid mixture A;

mixing the components in the reinforcing agent component B to obtain a mixture B, and packaging to obtain an independently packaged mixture B;

and packaging the independently packaged liquid mixture A and the independently packaged mixture B to obtain the environment-friendly coating.

The liquid mixture A and the reinforcing agent component B are independently prepared, and when the environment-friendly coating is used, the liquid mixture A and the reinforcing agent component B are mixed on site and then coated, so that the storage time of the environment-friendly coating is prolonged, and the problem that the environment-friendly coating containing the components cannot be produced in batches is solved.

The viscosity of the liquid mixture A is adjusted to 70-100KU by adding water, thereby not only ensuring the stability of the coating and ensuring the storage time to be long, but also realizing the painting requirement in the production process.

The addition of the other individual components of the liquid component A to water comprises the following steps,

adding the emulsion into water, stirring to uniformly mix the emulsion and the water, adding the defoaming agent and the film-forming assistant into the mixture, stirring to fully dissolve the mixture, and finally adding the thickening agent into the mixture and fully stirring.

The preparation method of the liquid mixture A comprises the following steps:

(1) adding 30-60 parts of emulsion into 20-30 parts of water, stirring and mixing uniformly, adding 0.05-0.3 part of defoaming agent and 0.5-3 parts of film-forming additive into a mixed solution, adding the film-forming additive, and stirring until the film-forming additive is fully dissolved;

(2) adding 0.2-1 part of thickening agent into the mixed solution, fully stirring, testing the viscosity, and finally adding water for adjusting the viscosity to adjust the viscosity of the liquid component A to 70-100KU to obtain a liquid mixture A;

preferably, in the step (1), the stirring time is 1-20 minutes after the film-forming assistant is added, and the rotating speed of a stirring device is 600-900 revolutions per minute during stirring;

more preferably, the film-forming assistant is added to the mixture in the step (1) and then the mixture is stirred for about 15 minutes.

The water for adjusting the viscosity may be the same as or different from the water for dissolving, but preferably the same.

An application of the environment-friendly coating on fiber cement boards.

When the environment-friendly coating is used, the reinforcing agent component B is added into the liquid component A, and the mixture is stirred and mixed uniformly to be used;

preferably, the liquid component a is stirred during mixing and the enhancer component B is added gradually during stirring.

When the paint is used on site, the reinforcing agent component B is added into the liquid component A, after the stirring and mixing are uniform, the paint is more uniform and more convenient to use, and the problem of large product quality difference between the paint when leaving a factory and the paint when in use can be avoided.

After adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects:

1. the environment-friendly coating is divided into the liquid component A and the reinforcing agent component B which are packaged independently, so that the effective components in the liquid component A exist more stably in the liquid, the storage time of the environment-friendly coating is prolonged, and the problem that the environment-friendly coating containing the components cannot be produced in batches is solved;

2. when the paint is used, the liquid component A and the reinforcing agent component B are uniformly mixed for use, and a paint film is formed by volatilization of moisture after coating, so that the film forming temperature is low, the film forming at normal temperature can be realized, and the limitation is small; the film forming time is short, the working efficiency is improved, and the labor cost is reduced; after the two are mixed, the opening time is long, and the waste is reduced.

3. The viscosity of the liquid component is adjusted to 70-100KU, the stability of the mixed coating can be satisfied, and the reinforcing agent component B is added under the viscosity, so that the painting requirement in the production process is ensured;

4. the coating disclosed by the invention has good adhesive force and strong water resistance;

5. the production cost is low, and the cost of the coating can be reduced to half of that of the water-based two-component epoxy coating.

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention to the right. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:

FIG. 1 is a plan element distribution diagram of a sheet material according to an embodiment of the present invention;

FIG. 2 is a plan element distribution plot of comparative example 1 sheet material of the present invention;

FIG. 3 is a graph of low temperature drying time and film formation performance measurements for an example of the present invention;

FIG. 4 is a graph showing the low-temperature drying time and film-forming property of comparative example 1 of the present invention.

It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.

Example one

the liquid component a comprises:

the enhancer component B comprises:

10 parts of silicate and silica sol.

The viscosity of the liquid component A was 75. + -. 5 KU. The weight ratio of silicate to silica sol was 1: 1.

Wherein the defoaming agent is YH-203, the film-forming assistant is dipropylene glycol propyl ether, the thickening agent is alkali swelling thickening agent T-900, and the silicate is lithium silicate. The grain size of the solute in the styrene-acrylic emulsion is 0.1-0.2 mu m.

The preparation method of the environment-friendly coating comprises the following steps,

1) preparation of liquid mixture a:

(1) adding 20 parts by weight of water into the emulsion, stirring and mixing the mixture uniformly at 600-900 rpm, adding the defoaming agent and the film-forming aid into the mixture to obtain a mixed solution, and stirring the added film-forming aid for 15 minutes to ensure that the film-forming aid is fully dissolved;

(2) adding 0.2 part of thickening agent into the mixed solution, fully stirring, detecting the viscosity, and finally adding water to adjust the viscosity of the liquid component A to 75 +/-5 KU to obtain a liquid mixture A;

2) preparation of enhancer component B:

mixing silicate and silica sol to obtain a mixture B, and packaging to obtain an independently packaged mixture B;

3) and packaging the independently packaged liquid mixture A and the independently packaged mixture B to obtain the environment-friendly coating.

When the environment-friendly coating is used, the reinforcing agent component B is gradually added into the liquid component A, and the mixture is stirred and mixed uniformly to be coated for use.

The environment-friendly coating can be applied to fiber cement plates.

The actual surface drying time is 10min, the requirement of low-temperature film forming at 5 ℃ is not abnormal, the detection result of low-temperature film forming is that the film forming of a paint film is good, and the scrubbing resistance is more than 1000 times.

Example two

the liquid component a comprises:

the enhancer component B comprises:

15 parts of silicate and silica sol.

The viscosity of the liquid component A is 80 +/-5 KU, and the weight ratio of the silicate to the silica sol is 1: 1.

1) preparation of liquid mixture a:

(1) adding 25 parts by weight of water into the emulsion, stirring and mixing the mixture uniformly at 600-900 revolutions per minute, adding the defoaming agent and the film-forming aid into the mixture to obtain a mixed solution, and stirring the added film-forming aid for 15 minutes to ensure that the film-forming aid is fully dissolved;

(2) adding 0.8 part of thickening agent into the mixed solution, fully stirring, detecting the viscosity, and finally adding water to adjust the viscosity of the liquid component A to 80 +/-5 KU to obtain a liquid mixture A;

2) preparation of enhancer component B:

The environment-friendly coating can be applied to fiber cement plates.

The actual surface drying time is 12min, the requirement of low-temperature film forming at 5 ℃ is not abnormal, the detection result of low-temperature film forming is that the film forming of a paint film is good, and the scrubbing resistance is more than 1000 times.

EXAMPLE III

the liquid component a comprises:

the enhancer component B comprises:

30 parts of silicate and silica sol.

The viscosity of the liquid component A is 95 +/-5 KU, and the weight ratio of the silicate to the silica sol is 1: 1.

Wherein the defoaming agent is YH-203, the film-forming assistant is dipropylene glycol propyl ether, the thickening agent is alkali swelling thickening agent T-900, and the silicate is lithium silicate. The grain size of the solute in the styrene-acrylic emulsion is generally 0.1-0.2 μm.

1) preparation of liquid mixture a:

(1) adding 30 parts by weight of water into the emulsion, stirring and mixing the mixture uniformly at 600-900 rpm, adding the defoaming agent and the film-forming aid into the mixture to obtain a mixed solution, and stirring the added film-forming aid for 20 minutes to ensure that the film-forming aid is fully dissolved;

(2) adding a thickening agent into the mixed solution, fully stirring, detecting the viscosity, and finally adding water to adjust the viscosity of the liquid component A to 95 +/-5 KU to obtain a liquid mixture A;

2) preparation of enhancer component B:

mixing lithium silicate and silica sol to obtain a mixture B, and packaging to obtain an independently packaged mixture B;

The environment-friendly coating can be applied to fiber cement plates.

The actual surface drying time is 8min, the requirement of low-temperature film forming at 5 ℃ is not abnormal, the detection result of low-temperature film forming is that the film forming of a paint film is good, and the scrubbing resistance is more than 1000 times.

Example four

The difference between this example and the first example is that in the preparation of the liquid mixture a, the defoamer and the film-forming aid are added to water and mixed, then the mixture is stirred until the film-forming aid is sufficiently dissolved, then the emulsion is added thereto, and finally the thickener is added. Other components, the amount and the steps are the same as those of the first embodiment.

The actual surface drying time is 12min, the requirement of low-temperature film forming at 5 ℃ is not abnormal, the low-temperature film forming is good, and the scrubbing resistance is more than 1000 times.

EXAMPLE five

The difference between this example and the first example is that in the preparation of the liquid mixture a, the defoamer and the film-forming aid are added to water and mixed, then the mixture is stirred until the film-forming aid is fully dissolved, then the thickener is added thereto, and finally the emulsion is added. Other components, the amount and the steps are the same as those of the first embodiment.

The actual surface drying time is 10min, the requirement of low-temperature film forming at 5 ℃ is not abnormal, the low-temperature film forming is good, and the scrubbing resistance is more than 1000 times.

EXAMPLE six

The difference between the present embodiment and the first embodiment is that the emulsions are pure acrylic emulsion and silicone acrylic emulsion; the silicate is lithium silicate, sodium silicate and potassium silicate; the defoaming agent is a mineral oil defoaming agent and an organic silicon defoaming agent; the film-forming auxiliary agent is dipropylene glycol propyl ether, dipropylene glycol butyl ether and Texanol; the thickening agent is alkali soluble swelling type, polyurethane type and inorganic type thickening agent. Other components and methods are the same as in example one. The organic silicon defoaming agent can be dimethyl silicone oil, and the alkali swelling thickener can be an alkali swelling thickener T-900.

The results of the experiment using the above substances were similar to those of example one.

Comparative example 1

Aqueous two-component epoxy coating: the water-based two-component epoxy coating is prepared by mixing common 128 resin and a Mannich base curing agent.

The preparation method of the Mannich base curing agent comprises the following steps:

to a 1 liter 3-neck flask equipped with a stirrer, thermocouple, condenser, distillation receiver, and addition funnel were added 272 grams (2 moles) of m-xylylenediamine ("MXDA") and 94 grams (1 mole) of phenol. The flask contents were purged with nitrogen and heated to 48 ℃. 144 g (2 mol) of butyraldehyde were added dropwise to the mixture over a period of 60 minutes while maintaining the temperature at 47-50 ℃. After an additional 60 minutes of incubation at 47-54 ℃, the temperature was raised to 160 ℃ during which all distillate was collected. After incubation at 160 ℃ for 20 minutes, the temperature was raised to 170 ℃. After 45 minutes, the flask contents were cooled and discharged.

The preparation method of the water-based two-component epoxy coating comprises the following steps: mixing 128 resin, the Mannich base curing agent prepared by the method and water according to the weight ratio of 1: 1.5: 2, stirring at the stirring speed of 1200 revolutions per minute by using a stirring device, and uniformly mixing to obtain the water-based two-component epoxy coating.

Comparative example 2

Embodiment one of patent 201410834619.2.

Comparative example 3

The liquid mixture A packed independently and the mixture B packed independently in example I were mixed, stirred and mixed uniformly to obtain a mixture, and the mixture was stored for 10 days and then examined.

Comparative example 4

This comparative example differs from comparative example 3 in that the test was carried out after 30 days of storage.

Comparative example 5

The present comparative example is different from example one in that the viscosity of the liquid component was adjusted to 120KU and flocculation occurred when the liquid component a and the enhancer component B were mixed, which was not seen in example one.

Comparative example 6

The comparative example is different from the first example in that the viscosity of the liquid component was adjusted to 50KU and the shelf life was substantially the same as that of the first example, and when the liquid component a and the reinforcing agent component B were mixed and coated, the substrate was inconspicuously seen, but when the coating of the first example was used, this phenomenon was not seen.

The experimental results are as follows:

the performance of the paint in example one and comparative example 1 is tested, the testing method and the testing result are as follows, and the performance standard adopts the testing method and the testing performance of the first-class product of the outer wall primer in JG/T210-2007.

1. Paint permeability detection

A detection instrument: SEM (scanning electron microscope, model HITACHI S-3400N), EDX (energy dispersive X-ray spectrometer, model HORIBA ADD 0009X-ray spectrometer).

Sample pretreatment: and (3) bonding a conductive adhesive tape on the sample table, directly bonding a film coating sample on the conductive adhesive tape, and performing gold spraying pretreatment.

And (3) testing conditions are as follows: the characterization conditions comprise that the vacuum state is less than 0.1MPa, the working distance is 10mm, the accelerating voltage is 15kV, the accelerating current is 30mA, and the element distribution information is obtained by utilizing an instrument test.

The environment-friendly coating of the first embodiment is mixed and coated on a fiber cement plate, an SEM-EDX-element distribution method is adopted for detection, the section of the plate is selected for scanning, and the scanning result is shown in figure 1.

The aqueous two-component epoxy coating of comparative example 1 was coated on a fiber cement panel and examined by SEM-EDX — elemental distribution method under the same examination conditions as in example one, and the panel section was also selected and scanned, and the scanning results are shown in fig. 2.

Analysis of results, from the planar element distribution of the sheet: after the fiber cement board is respectively coated with the water-based two-component epoxy coating and the coating of the first embodiment, the permeability of the coating of the first embodiment is superior to that of the water-based two-component epoxy coating in terms of the permeation distribution comparison of carbon elements (white parts in pictures).

2. Analysis of adhesion, bond Strength and Water resistance

Table 1 adhesion, bond strength and Water resistance of the coatings

From the performance detection result, the performance of the coating disclosed by the invention completely reaches the standard of a water-based two-component epoxy coating. However, the cost of the formulation of the present invention is half of the cost of the aqueous two-component epoxy coating.

3. Detection of surface drying time and Low temperature film Forming Properties

Example one, comparative example 1, comparative example 3 and comparative example 4 were coated on the same fiber cement board and the tack-free time and low temperature film forming properties measured using an F-DOM instrument are shown in table 2.

The test results of example one are shown in fig. 3, and the test results of comparative example 1 are shown in fig. 4.

TABLE 2 Table of drying time and Low temperature film formation Properties

Compared with the coating of the invention in the first embodiment, the actual surface drying time of the first embodiment is greatly reduced, the time is saved, and the paint mold is good in film forming and resistant to scrubbing.

Comparative examples 3 and 4 compared with example one, the longer the time for storage after mixing to form a one-component coating, the poor stability, the poor film forming effect, and the drastically reduced washing resistance after coating. This is because, after mixing, the solution is left for a long time to coagulate and form solid particles to precipitate, which greatly reduces the film-forming property and scrub resistance.

4. Influence of age

TABLE 3 usable time

The aqueous two-component epoxy coating has a gel phenomenon in the stirring process, so that the viscosity of the roll coating is increased in the production process, and the first embodiment has no such phenomenon.

And the F-DOM detection result shows that the primer does not generate gel under the condition of water existence, and the primer can be quickly dried to form a film after the water is volatilized, so that the characteristics and the requirements of a production line are completely met.

5. Comparison of shelf-life

The storage times (in months) for examples one to five and comparative examples 1, 2, 5, 6 were compared at a heat storage temperature of 55 ℃ as shown in the following table.

TABLE 4 shelf life

	Storage time (moon)
		Example one	13
Example two	14
		EXAMPLE III	13
Example four	11
		EXAMPLE five	11
Comparative example 1	10
		Comparative example 2	2
Comparative example 5	13
		Comparative example 6	12

The experimental results of the comparison between the first to third examples and the fourth and fifth examples show that the storage time of the liquid component A is affected by different adding sequences of the components in the preparation process of the liquid component A, and the liquid component A prepared by the method of the first to third examples is not easy to flocculate and has longer storage time.

The first embodiment to the fifth embodiment are compared with the comparative example 1, and from experimental results, the storage time of the coating is obviously longer than that of the water-based two-component epoxy coating by adopting the coating of the invention, and the formula cost of the coating is lower and the market competitiveness is higher.

Examples one-five the shelf life of the coating of the present invention was significantly higher than that of the coating in 201410834619.2, compared to comparative example 2.

The first to fifth examples are compared with the comparative example 3, in the comparative example 3, the film forming property is already abnormal and the problem of poor film forming property is caused after 10 days of mixing the liquid component A and the reinforcing agent component B, the storage time is generally 7 days after the normal storage time is less than 10 days, and the storage time of the environment-friendly coating prepared by the method of separately packaging the liquid component A and the reinforcing agent component B and mixing the liquid component A and the reinforcing agent component B during use is greatly prolonged.

Examples one to five the viscosity of the liquid component was adjusted to 70 to 100KU and the stability of the liquid mixture a was improved, as compared with comparative examples 5 and 6. Comparative example 5 has a high viscosity, does not affect the stability of the liquid mixture a, does not affect the shelf life of the coating, but when the liquid mixture a is mixed with the reinforcing agent component B, a flocculation phenomenon occurs; comparative example 6 has too low a viscosity, which has an effect on the stability of the liquid mixture a, so that its shelf life is slightly reduced.

Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The environment-friendly coating is characterized by comprising a liquid component A and an enhancer component B which are independently packaged, and the environment-friendly coating comprises the following raw materials in parts by mass:

the liquid component a comprises:

the enhancer component B comprises:

10-30 parts of silicate and/or silica sol.

2. The environment-friendly paint as claimed in claim 1, wherein the viscosity of the liquid component A is 70 to 100 KU;

preferably, the viscosity of the liquid component a is 80 ± 5 KU.

3. The environment-friendly coating as claimed in claim 1 or 2, wherein the emulsion comprises one or more of styrene-acrylic emulsion, acrylic emulsion and silicone-acrylic emulsion;

4. The environment-friendly coating as claimed in any one of claims 1 to 3, wherein the defoaming agent comprises one or a mixture of mineral oil type defoaming agent and silicone defoaming agent;

5. An environment-friendly paint as claimed in any one of claims 1 to 4, wherein the silicate comprises one or more of lithium silicate, sodium silicate and potassium silicate.

6. A method for preparing the environment-friendly coating according to any one of claims 1 to 5,

7. A process according to claim 6, wherein the addition of the other components of the liquid component A to water comprises the steps of,

8. The method according to claim 7, wherein the method for preparing the liquid mixture A comprises the following steps:

9. Use of the environmentally friendly coating of any one of claims 1 to 5 on fiber cement board.

10. A use method of the environment-friendly coating as claimed in any one of claims 1 to 5, wherein when in use, the reinforcing agent component B is added into the liquid component A, and the mixture is stirred and mixed uniformly to be used;