阅读说明：本技术 一种高耐雨痕建筑涂料及其制备方法 (Building coating with high rain mark resistance and preparation method thereof ) 是由 詹明佳 赵雅文 刘东华 薛瑞娟 于 2021-10-25 设计创作，主要内容包括：本申请涉及涂料的技术领域,具体公开了一种高耐雨痕建筑涂料及其制备方法,高耐雨痕建筑涂料,按重量百分数计,包括乳液30-40%,填料29.5-43%,助剂3.6-5.2%,水10-30%；以填料为100%重量份数计,3.75-10.71wt%的填料的比表面积为300-500m～(2)/g,比表面积300-500m～(2)/g的填料为高比表面积填料。高耐雨痕建筑涂料的制备方法,包括有以下步骤：将乳液、高比表面积填料、低比表面积填料、助剂和水混合均匀。本申请具有在保证涂料质量的情况下提高了涂料耐雨痕性能的效果。(The application relates to the technical field of coatings, and particularly discloses a high rain mark resistance building coating and a preparation method thereof, wherein the high rain mark resistance building coating comprises, by weight, 30-40% of emulsion, 29.5-43% of filler, 3.6-5.2% of auxiliary agent and 10-30% of water; based on 100 weight percent of the filler, the specific surface area of 3.75-10.71 weight percent of the filler is 300-500m 2 A specific surface area of 300- 2 The fillers/g are high specific surface area fillers. The preparation method of the building coating with high rain mark resistance comprises the following steps: and uniformly mixing the emulsion, the high specific surface area filler, the low specific surface area filler, the auxiliary agent and water. The application has the effect of improving the rain mark resistance of the coating under the condition of ensuring the quality of the coating.)

1. A building coating with high rain mark resistance is characterized in that: according to 100 percent of the coating by weight, the coating comprises 30 to 40 percent of emulsion, 29.5 to 43 percent of filler, 3.6 to 5.2 percent of auxiliary agent and 10 to 30 percent of water;

based on 100 weight percent of the filler, the specific surface area of 3.75-10.71 weight percent of the filler is 300-500m²A specific surface area of 300-²The fillers/g are high specific surface area fillers.

2. The high rainmark resistance architectural coating according to claim 1, wherein: the oil absorption value of the high specific surface area filler is 440-780ml/100 g.

3. The high rainmark resistance architectural coating according to claim 1, wherein: the high specific surface area filler is in the form of sponge-like particles.

4. A high rainmark resistance architectural coating according to claims 1 to 3, characterized in that: the filler with high specific surface area is one or more of calcium silicate, sodium silicate, potassium silicate and sodium aluminosilicate.

5. A high rainmark resistance architectural coating according to any one of claims 1 to 3, wherein: the filler is selected from one or more of titanium dioxide, talcum powder, calcined kaolin, calcium carbonate, sodium silicate and potassium silicate.

6. A high rainmark resistance architectural coating according to any one of claims 1 to 3, wherein: the auxiliary agent comprises one or more of a dispersing agent, a wetting agent, a pH regulator, a preservative, a film-forming auxiliary agent, an antifreezing agent, a defoaming agent and a thickening agent.

7. A high rainmark resistance architectural coating according to any one of claims 1 to 3, wherein: the auxiliary agent is prepared from (0.5-0.7) by weight: (0.1-0.2): (0.1-0.3): (0.1-0.3): (1-1.5): (1-1.5): (0.2-0.4): (0.1-0.2): (0.2-0.4) dispersing agent, wetting agent, pH regulator, preservative, film-forming additive, antifreezing agent, defoaming agent, cellulose thickener, polyurethane thickener, preservative, film-forming additive, antifreezing agent, defoaming agent, cellulose thickener and polyurethane thickener.

8. A preparation method of a building coating with high rain mark resistance is characterized by comprising the following steps: the method comprises the following steps:

and uniformly mixing the emulsion, the high specific surface area filler, the low specific surface area filler, the auxiliary agent and water.

9. The method for preparing the architectural coating with high rain mark resistance according to claim 9, wherein the method comprises the following steps: the auxiliary agent comprises a dispersant part, a wetting agent, a pH regulator, a preservative, a film-forming auxiliary agent, an antifreezing agent, a defoaming agent, a cellulose thickener and a polyurethane thickener;

the emulsion, water, a wetting agent, a dispersing agent, a cellulose thickener, a pH value regulator, an antifreezing agent and 1/2 parts by weight of a defoaming agent are uniformly mixed, then the high specific surface area filler and the low specific surface area filler are added and uniformly mixed until the fineness is less than or equal to 60 micrometers, and then a film-forming assistant, a preservative, a polyurethane thickener and the rest defoaming agent are added.

Technical Field

The application relates to the technical field of coatings, in particular to a high-rain-mark-resistance building coating and a preparation method thereof.

Background

The phenomenon of bright spots and rain marks is that hydrophilic substances such as an emulsifier, a wetting agent, a dispersing agent and the like in a paint film migrate to the surface along with rainwater or dew, and when water is completely volatilized, the water is enriched on the paint film to form bright spots. Rain marks of exterior wall coatings mainly appear in exterior wall coatings with high emulsion content and low PVC, and particularly appear in aqueous elastic coatings more easily. Rain marks are a common defect of the water-based exterior wall latex paint, and seriously destroy the decorative effect of the exterior wall latex paint.

In the related technology, in order to reduce the phenomenon of rain marks, the problem of poor rain marks is mainly solved by selecting a high-water-resistant dispersant, a low-HLB wetting agent and a high-hydrophobic emulsion in an exterior wall coating product, the method can reduce the phenomenon of rain marks on the exterior wall to a certain extent, but the problem of poor compatibility, flooding, blooming and other quality defects of a water-based coating system are easily caused by selecting the hydrophobic dispersant and wetting agent; and the problem that some small molecular weight substances such as a dispersing agent, a wetting agent and the like are separated out along with rainwater cannot be solved by virtue of the hydrophobicity of the emulsion, namely a certain rain mark phenomenon still occurs.

Therefore, the problem of rain marks of the water-based exterior wall coating is solved under the condition of ensuring the quality of the coating, and the problem to be solved in the field of coatings is urgent.

Disclosure of Invention

In order to improve the rain mark resistance of the coating, the application provides a high rain mark resistance building coating and a preparation method thereof.

In a first aspect, the application provides a high rain mark resistance architectural coating, which adopts the following technical scheme:

a building coating with high rain mark resistance comprises, by weight, 30-40% of emulsion, 29.5-43% of filler, 3.6-5.2% of auxiliary agent and 10-30% of water;

based on 100 weight percent of the filler, the specific surface area of 3.75-10.71 weight percent of the filler is 300-500m²A specific surface area of 300-²The fillers/g are high specific surface area fillers.

In particular, the high specific surface area filler may be present in the coating in an amount of 1.5%, 1.7%, 2%, 2.3%, 2.5%, 2.6%, 2.9%, 3.0% by weight.

By adopting the technical scheme, the filler with high specific surface area has strong adsorption capacity, and can adsorb an auxiliary agent which is easy to separate out from the water-based paint in a coating film, so that the phenomenon that the auxiliary agent is taken out of the surface to form rain marks due to rain is avoided, and the rain mark resistance of the paint is improved.

When the content of the high specific surface area filler is higher than the defined range, the dispersibility of the coating material is deteriorated, and when the content of the high specific surface area filler is lower than the defined range, the rain mark resistance of the coating material is more decreased, so that the coating material has better rain mark resistance characteristics within the range of the amount of the high specific surface area filler defined in the present application.

In particular, the acrylic emulsion may be sublimed 9800 or dow AC 261.

Preferably, the high specific surface area filler has an oil absorption value of 440-780ml/100 g.

For example, the high surface area filler may have an oil absorption of 450ml/100g, 500ml/100 g.

By adopting the technical scheme, the rain mark resistance of the coating is better within the range limited by the oil absorption value.

Preferably, the high specific surface area filler is a sponge-like particle.

Preferably, the high specific surface area filler is one or more of calcium silicate, sodium silicate, potassium silicate and sodium aluminosilicate.

Further preferably, the high specific surface area filler is one or more of calcium silicate, sodium silicate and potassium silicate.

The high-specific-surface-area filler adsorbs the auxiliary agent which is easy to separate out from the water-based paint in the coating film through the strong adsorption capacity of the filler, and the auxiliary agent is not easy to be taken out to the surface by rain to form rain marks, so that the rain mark resistance of the paint is improved; the specific surface area of the filler with a high specific area is in the limited range of the application, namely, the additive with a certain content added in the adsorption coating can be adsorbed, so that the additive is not easily brought out to the surface by rainwater.

Preferably, the filler is selected from one or more of titanium dioxide, talcum powder, kaolin, calcium carbonate, sodium silicate and potassium silicate.

In one embodiment, the filler is present in a weight ratio of (10-15): (10-15): (3-5): (1.5-3) titanium dioxide, calcium carbonate, talcum powder and calcium silicate.

Preferably, the titanium dioxide is rutile titanium dioxide.

In one embodiment, the titanium dioxide may be herbori 699.

Preferably, the calcium carbonate is ground calcium carbonate.

Preferably, the mesh number of the calcium carbonate is 800-1500 meshes.

In one embodiment, the calcium carbonate is 1250 mesh heavy calcium carbonate.

Preferably, the talc powder has 500-1000 meshes.

For example, the mesh size may be 600 mesh, 800 mesh, 900 mesh, or 1000 mesh.

Preferably, the auxiliary agent comprises one or more of a dispersing agent, a wetting agent, a pH regulator, a preservative, a film forming auxiliary agent, an antifreezing agent, a defoaming agent and a thickening agent.

Preferably, the auxiliary agent is prepared from (0.5-0.7) by weight: (0.1-0.2): (0.1-0.3): (0.1-0.3): (1-1.5): (1-1.5): (0.2-0.4): (0.1-0.2): (0.2-0.4) dispersing agent, wetting agent, pH regulator, preservative, film-forming additive, antifreezing agent, defoaming agent, cellulose thickener, polyurethane thickener, preservative, film-forming additive, antifreezing agent, defoaming agent, cellulose thickener and polyurethane thickener.

Preferably, the wetting agent is alkyl polyoxyethylene ether.

Specifically, the wetting agent is selected from Dow BD-405 and Clarian LCN 407.

Preferably, the dispersant is a sodium polyacrylate or ammonium salt dispersant.

Specifically, the dispersant may be selected from 5040, 5027 of Nopocidae, 731A of Dow.

Preferably, the defoaming agent is selected from mineral oils, silicone modified defoaming agents.

In particular, the antifoaming agent may be selected from nopinaceous NXZ, clariant NS 22.

Preferably, the PH adjuster is an organic amine. For example, the pH adjusting agent is AMP-95.

Preferably, the film-forming assistant is an alcohol ester film-forming assistant.

For example, the coalescent is Iseman TEXANOL.

Specifically, the thickener can be selected from Dow 2020 and 8W.

Preferably, the cellulose is selected from hydroxyethylcellulose. For example, the cellulose is ashland HBR 250.

Preferably, the preservative is isothiazolinone.

For example, the preservative may be selected from the group consisting of Dow LXE, Soll MBS 5050.

Preferably, the antifreeze is selected from propylene glycol and ethylene glycol.

In a second aspect, the application provides a preparation method of a high rain mark resistance building coating, which adopts the following technical scheme: a preparation method of a building coating with high rain mark resistance comprises the following steps:

and uniformly mixing the emulsion, the high specific surface area filler, the low specific surface area filler, the auxiliary agent and water.

Preferably, the auxiliary agent comprises a dispersant part, a wetting agent, a pH regulator, a preservative, a film-forming auxiliary agent, an antifreezing agent, a defoaming agent, a cellulose thickener and a polyurethane thickener;

evenly mixing emulsion, water, 1/2 parts by weight of defoaming agent, wetting agent, dispersing agent, cellulose thickener, pH value regulator and antifreezing agent, adding high specific surface area filler and low specific surface area filler, evenly mixing until the fineness is less than or equal to 60 micrometers, and then adding film-forming additive, 1/2 parts by weight of defoaming agent, preservative and polyurethane thickener.

In summary, the present application includes at least one of the following beneficial technical effects:

1. by adding a certain content of high specific surface area filler, the high specific surface area filler adsorbs the auxiliary agent which is easy to separate out from the water-based paint to be coated again, so that the phenomenon that the auxiliary agent is taken out of the surface due to rainwater is avoided, the rain mark resistance of the paint is improved, the paint can be well dispersed, the paint does not generate a flower and has no floating color when being coated, and the coating quality of the paint is ensured;

2. the rain mark resistance of the coating is improved by selecting the filler with high specific surface area and specific high oil absorption value;

3. the rain mark resistance of the coating is improved by specific selection of the type of the specific surface area filler.

Detailed Description

The present application is described in further detail in conjunction with the following.

An emulsion, an acrylic emulsion, dow AC 261;

titanium dioxide, rutile titanium dioxide, bailey 699;

calcium carbonate, 1250-mesh heavy calcium carbonate, Jiangxi Guangyuan chemical industry;

talcum powder of 800 meshes, Heshan chemical engineering;

calcium silicate, the model (specification) is 600 respectively, and the manufacturer is winning;

wetting agents, Dow BD-405;

dispersant, nopinaceae 5040;

antifoam agents, colain NS 22;

pH regulators, such as AMP-95;

a film-forming aid, Ismann TEXANOL;

polyurethane thickeners, dow 2020;

cellulose thickener, ashland HBR 250;

preservatives, isothiazolinones, clarithrone;

antifreeze, propylene glycol, industrial, tianjinguguay.

The detection method of the oil absorption value of the filler comprises the following steps: 100g of filler is placed on a glass plate, DOP is dripped into a dropping bottle with known weight containing DOP, meanwhile, the adjusting knife is used for continuously stirring and grinding, the sample is dispersed at first, then the sample is gradually agglomerated until the sample is completely infiltrated by DOP, and the whole agglomeration is the end point, and the mass of the dropping bottle is accurately weighed.

Examples

Example 1

A building coating with high rain mark resistance is prepared by the following steps:

firstly, adding emulsion, water, 1/2 (by weight) defoaming agent, wetting agent, dispersing agent, cellulose, pH value regulator and antifreezing agent into a dispersion cylinder, uniformly stirring at the state of 300-400rpm, then adding titanium dioxide, calcium carbonate, kaolin and calcium silicate, dispersing for 20min at the state of 1200-1500rpm until the fineness is less than or equal to 60 microns, then adding film-forming assistant, 1/2 (by weight) defoaming agent, preservative and polyurethane thickener, uniformly stirring, and regulating the viscosity to obtain the coating.

Wherein the specific surface area of calcium silicate is 300m²The oil absorption value is 450ml/100 g. The contents of the components are shown in Table 1, and the unit of the contents of the components is kg.

Example 2

The difference from example 1 is that: the amount of calcium silicate added was varied from calcium silicate to calcium silicate, and the specific amounts added are shown in Table 1.

Example 3

The difference from example 1 is that: the calcium silicate was replaced with an equal weight of sodium aluminosilicate having a specific surface area and oil absorption value comparable to that of calcium silicate in example 1. The parameters of specific surface area and oil absorption are shown in Table 2.

Comparative examples 1 to 2

The difference from example 1 is that: the specific surface area and oil absorption values of calcium silicate are different.

Comparative example 3

The difference from example 1 is that: the calcium silicate was replaced with an equal weight of diatomaceous earth, which had a different specific surface area and oil absorption value than the calcium silicate of example 1, as shown in table 2.

Comparative examples 4 to 5

The difference from example 1 is that: the addition amount of each component is different, and the specific table is shown in table 1.

TABLE 1 ingredient content tables for examples 1-2 and comparative examples 4-5

	Examples1	Example 2	Comparative example 4	Comparative example 5
					Emulsion and method of making	35	35	35	35
Titanium white powder	15	15	15	15
					Calcium carbonate	15	13.5	12.5	15.5
Talcum powder	3	3	3	3
					Calcium silicate	1.5	3	4	1
Dispersing agent	0.6	0.6	0.6	0.6
					Wetting agent	0.1	0.1	0.1	0.1
PH regulator	0.2	0.2	0.2	0.2
					Preservative	0.2	0.2	0.2	0.2
Film forming aid	1	1	1	1
					Antifreezing agent	1	1	1	1
Defoaming agent	0.2	0.2	0.2	0.2
					Cellulose thickener	0.1	0.1	0.1	0.1
Polyurethane thickener	0.2	0.2	0.2	0.2
					Water (W)	26.9	26.9	26.9	26.9

TABLE 2 parameter tables for specific surface area and oil absorption values of high specific surface area fillers and alternative materials

Performance detection

1. Rain mark resistance test-adopting dropper water spraying method for testing

0.2kg of the coating is evenly coated on 1m²After drying for 24H, the surface of the coating film was sprayed with water three times using a 20ml dropper, and the sample plate was laid flat. After the water has evaporated, the surface effect is observed at present.

Evaluation of the effects: and (4) adopting a scoring mode. 5, no rain mark is completely formed; 4, the mark has very slight rain marks but is not obvious by visual inspection; slight rain marks exist in the 3 th division, which are slightly obvious at present; 2, obvious rain marks are formed; 1 is classified as having severe rain marks.

Rain mark resistance effect scores were recorded to table 3.

2. Detecting the viscosity of the coating

The viscosity of the coating slurry is detected by referring to GB/T9269-2009 Stomer viscosity measurement method, the higher the viscosity is, the poorer the dispersibility of the coating is, and the detection result is shown in Table 3.

TABLE 3 Performance test results

	Rain mark resistance effect score	viscosity/(KU)
			Example 1	4	101
Example 2	5	105
			Example 3	3	105
Comparative example 1	2	105
			Comparative example 2	5	140
Comparative example 3	2	104
			Comparative example 4	5	130
Comparative example 5	3	100

As can be seen from table 1, in examples 1-2 and comparative examples 4-5, it is apparent that the raindrop-resistant effect of the coating obtained in example 1-2 is better than that of comparative example 5, which indicates that the amount of the high specific surface area filler added in examples 1-2 is more excellent, and meanwhile, it is found through examples 1-2 that within the range of the amount of the high specific surface area filler defined in the present application, the raindrop-resistant phenomenon can be improved more remarkably with the increase of the amount of the calcium silicate having a sponge structure; however, the coating material obtained in comparative example 4 was improved in the rain mark resistance effect with the increase in the calcium silicate content, but the viscosity value was greatly increased, which indicates that the dispersibility of the coating material was deteriorated.

In examples 1 and 2 and comparative examples 1 to 2, the coatings obtained in examples 1 and 2 were significantly superior in the effect of rain mark resistance to comparative example 1. Through the embodiment 1 and the comparative example 1, the ordinary structural calcium silicate with lower specific surface area does not help to improve the rain mark resistance, and the use of the spongy calcium silicate can obviously improve the rain mark resistance of a paint film; it is found from example 1 and comparative example 2 that the rain mark resistance effect is improved as the specific surface area of calcium silicate is further increased, but the viscosity value is greatly increased, and the dispersibility of the coating material is deteriorated. The specific surface area and the oil absorption value of the high specific surface area filler within the range defined by the application are more beneficial to improving the rain mark resistance of the coating, and simultaneously, the good dispersibility of the coating is ensured.

In example 1 and comparative example 3, the rain mark resistance of the coating obtained in example 1 is obviously better than that of comparative example 3, the common diatomite with a high oil absorption and a multi-gap structure has a less obvious rain mark resistance effect on a system, and the calcium silicate powder without a sponge structure has a good effect.

In examples 1 and 3, the specific surface area and the oil absorption value of the high specific surface area filler are the same, but the type of the high specific surface area filler is different, and the rain mark resistance of the coating obtained in example 1 is better.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.