CN114525074A

CN114525074A - Decorative interior wall coating and preparation method thereof

Info

Publication number: CN114525074A
Application number: CN202210083227.1A
Authority: CN
Inventors: 黄国权; 黄旭明
Original assignee: Guangdong Huadaxuan Construction Engineering Co ltd
Current assignee: Guangdong Huadaxuan Construction Engineering Co ltd
Priority date: 2022-01-25
Filing date: 2022-01-25
Publication date: 2022-05-24
Anticipated expiration: 2042-01-25
Also published as: CN114525074B

Abstract

The application belongs to the technical field of coatings, and particularly discloses a decorative interior wall coating and a preparation method thereof. The decorative interior wall coating comprises a component A and a component B, wherein the component A comprises: acrylic polyol dispersoid, filler, flatting agent, modified fiber bundle, dispersant and water; the component B comprises: polyisocyanate curing agent, catalyst, cross-linking agent and defoaming agent. The preparation of the modified fiber bundle comprises the following steps: pretreatment: ultrasonically cleaning the fiber bundle, and drying for later use; etching: putting the pretreated fiber bundle into melted maleic anhydride; cleaning: and cleaning and drying the etched fiber bundle to obtain the modified fiber bundle. The decorative interior wall coating can enable the modified fiber bundles to be uniformly dispersed, so that an ideal crack pattern is presented, and better adhesive force is provided.

Description

Decorative interior wall coating and preparation method thereof

Technical Field

The application relates to the field of coatings, in particular to a decorative interior wall coating and a preparation method thereof.

Background

The paint can be coated on the surface of an object by different construction processes to form a continuous solid film with firm adhesion and certain strength. The coating material generally includes film-forming materials, solvents, fillers, additives, and the like. In recent years, with the rapid development of the paint industry, paints with various functions and different decorative types are beginning to be applied to the decoration of the inner walls of buildings.

The crack paint is one kind of paint, and can produce beautiful cracks with multiple ends on the surface of the decoration, so that the paint has high ornamental value and is gradually used as a high-grade decoration material for building decoration. The crack paint is obtained by cracking the paint surface in the drying process, and the uniform crack pattern is obtained under the combined action of factors such as a reasonable formula, a skilled spraying process, proper environmental temperature and humidity, so that the problems of too fine cracks, no cracks, uneven crack sizes and the like easily occur in the conventional crack paint.

In conclusion, the inventor of the application considers that the industry lacks an interior wall coating which can obtain an ideal uniform crack pattern and has ornamental value.

Disclosure of Invention

In order to obtain an interior wall coating capable of exhibiting a desired crack pattern, the present application provides a decorative type interior wall coating and a method for preparing the same.

The application provides a decorative interior wall coating and a preparation method thereof, which adopt the following technical scheme:

in a first aspect, the present application provides a decorative interior wall coating material, which adopts the following technical scheme:

a decorative interior wall coating comprises a component A and a component B,

the component A comprises the following components in parts by weight: 55-80 parts of acrylic polyol dispersoid, 15-25 parts of filler, 2-5 parts of flatting agent, 20-40 parts of modified fiber bundle, 3.5-7 parts of dispersant and 60-100 parts of water;

the component B comprises the following components in parts by weight: 30-70 parts of a polyisocyanate curing agent, 1-3.5 parts of a catalyst, 10-15 parts of a cross-linking agent and 2-8 parts of a defoaming agent;

the modified fiber bundle is prepared from the following raw materials in parts by weight: 55-85 parts of fiber bundles, 80-120 parts of ethanol and 80-100 parts of maleic anhydride;

the preparation method of the modified fiber bundle comprises the following steps:

pretreatment: ultrasonically cleaning the fiber bundle, and drying for later use;

etching: putting the pretreated fiber bundle into melted maleic anhydride; (ii) a

Cleaning: and cleaning and drying the etched fiber bundle to obtain the modified fiber bundle.

By adopting the technical scheme, the fiber bundles are added into the coating, and are uniformly dispersed in the coating, so that the fiber bundles are mutually crossed and freely bent, and a crack pattern with aesthetic feeling can be presented.

However, there are difficulties in uniformly dispersing the fiber bundles within the coating, which are manifested in several areas: firstly, the surface of the fiber bundle does not contain active groups, presents hydrophobicity, and has poor interface bonding performance with the coating; secondly, the fiber bundles tend to agglomerate easily under the action of stirring force, so that the appearance effect is influenced; thirdly, due to the action of gravity, the fiber bundles are easily accumulated downward after being adhered to the wall surface by the coating.

Therefore, the inventors of the present application obtained a modified fiber bundle by surface-modifying a fiber bundle, and the surface roughness of the modified fiber bundle was improved, which was advantageous in increasing the interfacial contact area between the modified fiber bundle and the acrylic polyol dispersion, improving the interfacial adhesion therebetween, and thus improving the degree of mixing dispersion of the modified fiber bundle in the acrylic polyol dispersion. The method for improving the dispersibility of the fiber bundle through surface modification has the characteristics of convenient operation, simple flow and obvious improvement effect. In addition, a dispersing agent is added in the component A, and the dispersing agent is obviously helpful for dispersing the modified fiber bundles in the acrylic polyol dispersion, so that the mixing uniformity of the modified fiber bundles and the acrylic polyol dispersion is improved. The dispersing agent can form a layer of stable film on the surface of the modified fiber bundle, and can prevent the modified fiber bundle from being agglomerated again.

The component A and the component B are mixed and coated on the wall surface, the moisture and the cosolvent are volatilized, the distance between various particles is gradually reduced, and a stacking structure is formed; then the acrylic polyol in the acrylic polyol dispersion gradually reacts with polyisocyanate to generate self-crosslinking isocyanate urethane, and the polyisocyanate reacts with carboxyl and water to gradually form a compact amino methyl ester network, so that a flat and smooth paint surface is obtained, and meanwhile, the modified fiber bundles are mutually crossed and freely bent to present an aesthetic crack pattern.

Experimental data shows that the interior wall coating is an ideal decorative interior wall coating capable of presenting a good crack pattern, and fills a gap in the industry.

Optionally, the dispersing agent is selected from one or more of methylcellulose, polyethylene oxide and sodium hydroxymethyl cellulose.

Experiments show that the dispersant has excellent dispersibility for the application, and can improve the dispersibility of the modified fiber bundle.

Optionally, the component A comprises the following components in parts by weight: 60-70 parts of acrylic polyol dispersoid, 15-25 parts of filler, 3-5 parts of flatting agent, 25-35 parts of modified fiber bundle, 5-6 parts of dispersing agent and 70-95 parts of water; the component B comprises the following components in parts by weight: 35-60 parts of hydrophilic polyisocyanate curing agent, 3-5 parts of catalyst, 10-15 parts of cross-linking agent and 2-5 parts of defoaming agent.

Experimental data show that by adopting the scheme, the obtained interior wall coating has better presentation effect, smoother paint surface and better performances in the aspects of leveling property, viscosity and modified fiber bundle mixing degree.

Optionally, the polyisocyanate curing agent is a hydrophilic polyisocyanate curing agent.

Experimental data show that the hydrophilic polyisocyanate curing agent has good water dispersibility and can be uniformly mixed with the acrylic polyol dispersoid more easily, so that the dispersity of the modified fiber bundles in the coating is further improved, and a better presentation effect is obtained.

Optionally, the catalyst is selected from one of a zinc carboxylate compound and a bismuth carboxylate.

In the application, the zinc carboxylate compound or the bismuth carboxylate has high catalytic activity, and is beneficial to ensuring the full reaction of the acrylic polyol and the polyisocyanate.

Optionally, the crosslinking agent is one of Hexamethylene Diisocyanate (HDI) and isophorone diisocyanate (IPDI).

For the purposes of the present application, both Hexamethylene Diisocyanate (HDI) and isophorone diisocyanate (IPDI) can assist in the formation of crosslinked structures, so that dense paint films are formed.

In a second aspect, the application provides a preparation method of the decorative interior wall coating, which adopts the following technical scheme: a preparation method of a decorative interior wall coating comprises the following steps:

preparing a component A: stirring the acrylic polyol dispersoid, adding the flatting agent, the filler and the water in a stirring state, heating, then adding the modified fiber bundle and the dispersing agent, and uniformly mixing to obtain a component A;

mixing: and uniformly mixing the component A and the component B to obtain the decorative interior wall coating.

According to the application, the modified fiber bundle and the acrylic polyol dispersoid are mixed to form the component A, and then the inner wall coating is obtained by mixing the component A with the component B, traditional processing equipment can be adopted for preparation, and the process is simple and convenient and is easy to control.

Optionally, the temperature after temperature rise is 55-65 ℃.

Experimental data show that when the mixing temperature is 55-65 ℃, the mixing effect of the modified fiber bundle and the acrylic polyol dispersoid is good, because the dispersibility of the dispersant is better when the mixing temperature is 55-65 ℃, so that the dispersing effect is improved.

To sum up, the application comprises the following beneficial technical effects:

the modified fiber bundle is added into the interior wall coating, so that the surface roughness of the modified fiber bundle is improved, the interface adhesion of the modified fiber bundle and each component in the coating is improved, and the effect of uniformly dispersing the modified fiber bundle can be obtained; in addition, the dispersing agent is added, so that the dispersibility of the modified fiber bundles after the component A and the component B are mixed is improved, the possibility of agglomeration in the mixing process is reduced, and the decorative interior wall coating capable of presenting a natural and stretched crack effect is obtained.

Detailed Description

The present application is described in further detail below.

Introduction of raw materials

The sources and model descriptions of some of the raw materials used in the following examples and comparative examples are shown in Table 1.

Table 1 introduction of sources and types of raw materials

Examples

Examples 1 to 1

A modified fiber bundle is prepared by the following raw materials: 55kg of fiber bundles, 120kg of ethanol and 80kg of maleic anhydride.

pretreatment: ultrasonically cleaning the fiber bundle, taking out after 10 hours, and drying in a dryer;

etching: melting maleic anhydride, adding the pretreated fiber bundle and the melted maleic anhydride, and uniformly mixing;

Examples 1 to 2

A modified fiber bundle is prepared by the following raw materials: 85kg of fiber bundles, 80kg of ethanol and 100kg of maleic anhydride.

Examples 1 to 3

A modified fiber bundle is prepared by the following raw materials: 70kg of fiber bundles, 100kg of ethanol and 90kg of maleic anhydride.

Example 2-1

A decorative interior wall coating is prepared from a component A, a preparation raw material and a coating agent, wherein the component A comprises the following raw materials:

55kg of acrylic polyol dispersoid, 25kg of filler, 2kg of flatting agent, 40kg of modified fiber bundle, 3.5kg of dispersing agent and 100kg of water;

wherein the modified fiber bundle is the modified fiber bundle prepared in the embodiment 1-1, and the dispersant is methyl cellulose;

a decorative interior wall coating is prepared from the following raw materials in part B:

30 parts of polyisocyanate curing agent, 3.5 parts of catalyst, 10 parts of cross-linking agent and 8 parts of defoaming agent; wherein, the catalyst adopts zinc picolinate, and the cross-linking agent adopts Hexamethylene Diisocyanate (HDI);

the preparation method of the decorative interior wall coating comprises the following steps:

preparing a component A: stirring the acrylic polyol dispersoid, adding the flatting agent, the filler and the water at the stirring speed of 1000r/min, uniformly mixing, heating to 55 ℃, adding the modified fiber bundle and the dispersing agent, and uniformly mixing to obtain a component A;

mixing: and (3) uniformly mixing the component A and a polyisocyanate curing agent at the stirring speed of 800r/min, adding a cross-linking agent, uniformly mixing, adding a catalyst and a defoaming agent, and uniformly mixing to obtain the decorative interior wall coating.

Examples 2 to 2

80kg of acrylic polyol dispersoid, 15kg of filler, 5kg of flatting agent, 20kg of modified fiber bundle, 7kg of dispersing agent and 60kg of water; wherein the modified fiber bundle is prepared in the embodiment 1-2, and the dispersant is methyl cellulose and sodium hydroxymethyl cellulose in a weight ratio of 1: 1;

70 parts of polyisocyanate curing agent, 1 part of catalyst, 15 parts of cross-linking agent and 2 parts of defoaming agent; wherein, the polyisocyanate curing agent adopts hydrophilic polyisocyanate curing agent, the catalyst adopts organic bismuth catalyst, and the cross-linking agent adopts isophorone diisocyanate (IPDI);

preparing a component A: stirring the acrylic polyol dispersoid, adding the flatting agent, the filler and the water at the stirring speed of 1000r/min, uniformly mixing, heating to 65 ℃, adding the modified fiber bundle and the dispersing agent, and uniformly mixing to obtain a component A;

Examples 2 to 3

65kg of acrylic polyol dispersoid, 20kg of filler, 4kg of flatting agent, 30kg of modified fiber bundle, 5.5kg of dispersing agent and 80kg of water; wherein the modified fiber bundle is the modified fiber bundle prepared in the embodiment 1-3, and the dispersant is polyoxyethylene;

50 parts of polyisocyanate curing agent, 2 parts of catalyst, 12 parts of cross-linking agent and 5 parts of defoaming agent; wherein the polyisocyanate curing agent adopts hydrophilic polyisocyanate curing agent, the catalyst adopts zinc picolinate, and the cross-linking agent adopts isophorone diisocyanate (IPDI);

preparing a component A: stirring the acrylic polyol dispersoid, adding the flatting agent, the filler and the water at the stirring speed of 1000r/min, uniformly mixing, heating to 60 ℃, adding the modified fiber bundle and the dispersing agent, and uniformly mixing to obtain a component A;

Examples 2-4 to 2-5 are different from examples 2-3 in that: the preparation raw materials of the decorative interior wall coating are different in proportion, wherein the proportion of the component A in the preparation raw materials of the decorative interior wall coating of the embodiment 2-4-2-5 is shown in the table 2.

TABLE 2 formulation ratio of A ingredient preparation raw materials of decorative type interior wall coating of examples 2-4 to 2-5

Raw materials	Examples 2 to 3	Examples 2 to 4	Examples 2 to 5
				Acrylic polyol Dispersion/kg	65	60	70
Talcum powder/kg	20	25	15
				Levelling agent/kg	4	3	5
Modified fiber bundle/kg	30	35	25
				Dispersant/kg	5.5	5	6
Water/kg	80	95	70

The formulation ratios of the B component in the raw materials for preparing the decorative interior wall coatings of examples 2-4 to 2-5 are shown in Table 3.

TABLE 3 formulation of raw materials for preparing B-component of decorative interior wall coating of examples 2-4 to 2-5

Raw materials	Examples 2 to 3	Examples 2 to 4	Examples 2 to 5
				Polyisocyanate curing agent/kg	50	35	60
Catalyst/kg	2	5	3
				Crosslinking agent/kg	12	10	15
Antifoam agent/kg	5	5	2

Comparative example

Comparative example 1

Comparative example 1 differs from examples 2-3 in that: the preparation raw materials in the decorative interior wall coating are different in proportion, and the component A of the coating comprises the following preparation raw materials: 60kg of acrylic polyol dispersoid, 10kg of filler, 1kg of flatting agent, 50kg of modified fiber bundle, 8kg of dispersing agent and 50kg of water;

the component B comprises the following preparation raw materials: 20 parts of polyisocyanate curing agent, 4 parts of catalyst, 5 parts of cross-linking agent and 10 parts of defoaming agent.

Performance detection

The coatings prepared in examples 2-1 to 2-5 and comparative example 1 were subjected to adhesion test, grade and crack uniformity comparison. Wherein: the adhesion test is rated according to the regulation in GB/T9286-1998, a concrete substrate is adopted, the adhesion rating is 0-5 and 5 in total, and the smaller the rating number is, the better the adhesion is represented; the classification and the grade of the paint products are carried out according to the regulations in GB/T9756-2018, the substrate adopts a non-asbestos fiber reinforced cement medium density board, and the paint products are classified into three grades of qualified products, first-class products and high-class products according to the use requirements; the uniformity effect of the cracks is observed by naked eyes, the uniformity index is 10 grades from 0-10, and the higher the uniformity index of the cracks is, the higher the representative uniformity degree is.

TABLE 4 adhesion, grade, uniformity index test results for the coatings

Sample (I)	Adhesion/grade	Grade/level	Uniformity index/grade
				Example 2-1	Level 1	Qualified product	Grade 5
Examples 2 to 2	Level 1	Qualified product	4 stage
				Examples 2 to 3	Level 0	Qualified product	Grade 9
Examples 2 to 4	Level 0	Qualified product	Grade 6
				Examples 2 to 5	Level 1	Qualified product	Stage 7
Comparative example 1	Stage 2	Qualified product	Level 1

According to the table 4, the examples 2-1 to 2-5 show that all indexes such as the workability, the coating appearance and the stability of the decorative interior wall coating prepared by the method all reach the national standard, and the interior wall coating with a smooth surface and a thin coating can be formed after the coating, so that the grade requirements of qualified products are met. In addition, the decorative interior wall coating is added with the modified fiber bundles, and the modified fiber bundles are fully mixed with other components of the coating, so that a beautiful crack pattern effect can be presented, the crack uniformity index is high, and the crack pattern distribution is uniform; and experimental data show that the decorative interior wall coating has excellent adhesive force grade and can keep good adhesive force. This indicates that the technical solution of the present application can exhibit a crack pattern with a natural form and uniform distribution while having excellent adhesion.

According to the test data reported in Table 4, compared with comparative example 1, the adhesion and uniformity indexes of the coatings prepared in examples 2-3 of the present application are significantly better than those of comparative example 1, and the adhesion and uniformity indexes of the coatings prepared in examples 2-3 of the present application are better than those of examples 2-4 to 2-5. This shows that the formulation of the raw materials for preparing the coating of the present application has a large influence on the properties of the coating, and the proper formulation is advantageous for further improving the adhesion of the coating and the crack pattern presentation effect of the fiber bundles in the coating.

The following analyses were performed on the principle of action of the present application:

in terms of uniformity index of cracks, modified fiber bundles are added into the coating, the surfaces of the fiber bundles are etched through maleic anhydride, a rougher surface is obtained, and therefore hydrophobicity of the fiber bundles is improved, and the modified fiber bundles with certain hydrophilicity are obtained. In addition, the surface modification solves the problems of poor dispersibility of the fiber bundle, uneven dispersion in the coating and poor mixing effect caused by no active groups on the surface of the fiber bundle to a certain extent. Furthermore, the dispersing agent is added in the mixing of the modified fiber bundles and the hydroxyl-containing acrylic polyol dispersoid, and the dispersing agent is easy to form a layer of stable film on the surface of the modified fiber bundles, so that the agglomeration phenomenon of the modified fiber bundles can be effectively improved, the modified fiber bundles are obviously favorably dispersed in the acrylic polyol dispersoid, the mixing uniformity of the modified fiber bundles in the acrylic polyol dispersoid is improved, the modified fiber bundles are mutually crossed and freely bent, and a crack pattern with aesthetic feeling is presented.

As for the grade of the coating, the reasonable proportion of the preparation raw materials is adopted, all indexes such as the application property, the coating appearance and the stability of the coating can be kept to still meet the national standard after the modified fiber is added, the delivery inspection requirements of qualified products are met, and the coating has better application property.

In terms of adhesion, the component A and the component B are mixed and coated, and the distances among various particles are gradually reduced along with the volatilization of moisture and a cosolvent to form a stacking structure; then, the acrylic polyol in the acrylic polyol dispersoid gradually reacts with polyisocyanate to generate self-crosslinking isocyanate urethane, and simultaneously, the polyisocyanate reacts with hydroxyl and water to gradually form a compact amino methyl ester network; the addition of the cross-linking agent can assist in forming a more stable cross-linking structure, so that a compact paint surface is obtained, and the adhesion of the interior wall coating is further improved.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims

1. A decorative interior wall coating is characterized in that: the paint comprises a component A and a component B, wherein the component A comprises the following components in parts by weight: 55-80 parts of acrylic polyol dispersoid, 15-25 parts of filler, 2-5 parts of flatting agent, 20-40 parts of modified fiber bundle, 3.5-7 parts of dispersant and 60-100 parts of water;

etching: putting the pretreated fiber bundle into melted maleic anhydride;

2. A decorative interior wall coating material according to claim 1, wherein: the dispersing agent is selected from one or more of methylcellulose, polyethylene oxide and sodium carboxymethylcellulose.

3. A decorative interior wall coating material according to claim 1, wherein: the component A comprises the following components in parts by weight: 60-70 parts of acrylic polyol dispersoid, 15-25 parts of filler, 3-5 parts of flatting agent, 25-35 parts of modified fiber bundle, 5-6 parts of dispersing agent and 70-95 parts of water;

the component B comprises the following components in parts by weight: 35-60 parts of hydrophilic polyisocyanate curing agent, 3-5 parts of catalyst, 10-15 parts of cross-linking agent and 2-5 parts of defoaming agent.

4. A decorative interior wall coating material according to claim 1, wherein: the polyisocyanate curing agent adopts a hydrophilic polyisocyanate curing agent.

5. A decorative interior wall coating material according to claim 1, wherein: the catalyst is selected from one of zinc carboxylate compounds and bismuth carboxylate.

6. A decorative interior wall coating material according to claim 1, wherein: the cross-linking agent is selected from one of Hexamethylene Diisocyanate (HDI) and isophorone diisocyanate (IPDI).

7. A method for preparing the decorative interior wall coating of any one of claims 1 to 6, comprising the steps of:

8. The method for preparing a finishing type interior wall coating material according to claim 6, wherein: the temperature after temperature rise is 55-65 ℃.