阅读说明：本技术 一种用于旧墙翻新的高性能底面合一外墙涂料及制备方法 (High-performance primer-topcoat exterior wall coating for renovating old wall and preparation method thereof ) 是由 王珂 王洪雷 付绍祥 于 2021-01-25 设计创作，主要内容包括：本发明涉及一种用于旧墙翻新的高性能底面合一外墙涂料及制备方法,该涂料,由以下原料组成：水、羟乙基纤维素、膨润土、消泡剂、分散剂、润湿剂、pH调节剂、钛白粉、绢云母粉、重质碳酸钙、煅烧高岭土、防冻剂、成膜助剂、防腐剂、防霉剂、苯丙乳液、聚氨酯增稠剂,本发明该涂料达到内外墙国标要求,具有良好的耐候性、抗泛盐碱性、耐水性,不仅避免了施工过程中底漆、面漆不匹配出现的质量问题,同时还减少了施工工艺、大大降低施工成本。(The invention relates to a high-performance primer-topcoat exterior wall coating for renovating old walls and a preparation method thereof, wherein the coating is prepared from the following raw materials: the coating meets the international requirements of internal and external walls, has good weather resistance, salt-overtaking resistance, water resistance, avoids the quality problem caused by mismatching of primer and finish paint in the construction process, reduces the construction process and greatly reduces the construction cost.)

1. A high-performance primer-topcoat exterior wall coating for renovating old walls is characterized by comprising the following raw materials in parts by weight:

2. the high-performance primer-topcoat exterior wall coating for renovating old walls of claim 1, wherein the hydroxyethyl cellulose is a nonionic soluble cellulose ether.

3. The high-performance primer-topcoat exterior wall coating for renovating old walls of claim 1, wherein the defoamer is one or any combination of mineral oil defoamer and silicone defoamer.

4. The high-performance primer-topcoat exterior wall coating for renovating old walls of claim 1, wherein the dispersant is one or any combination of two of a sodium polycarboxylate dispersant and an ammonium salt dispersant.

5. The high performance all-in-one exterior wall coating for renovating old walls of claim 1, wherein the wetting agent is a nonionic surfactant.

6. The high-performance primer-topcoat exterior wall coating for renovating old walls of claim 1, wherein the titanium dioxide is rutile type titanium dioxide.

7. A method for preparing the high-performance primer-topcoat exterior wall coating for renovating old walls according to any one of claims 1 to 6, which comprises the following steps:

1) firstly, adding water into a dispersion cylinder, then adding hydroxyethyl cellulose and bentonite at the rotation speed of 300-500 r/min of the dispersion cylinder, then increasing the rotation speed of the dispersion cylinder to 600-800 r/min, stirring for 1-3 min, then adding a defoaming agent, a dispersing agent, a wetting agent and a pH regulator, and continuing stirring for 5-10 min;

2) then adding titanium dioxide, sericite powder, heavy calcium carbonate and calcined kaolin, stirring to a uniform state, scraping the powder on the wall of the dispersion cylinder, adjusting the rotating speed of the dispersion cylinder to 1200-1500 r/min, and stirring for 15-20min until the fineness of the solution is less than or equal to 50 μm;

3) and then adjusting the rotating speed of the dispersion cylinder to 800-1000 r/min, sequentially adding an antifreezing agent, a film-forming aid, a preservative, an anti-mildew agent, a styrene-acrylic emulsion and a polyurethane thickener, and stirring for 15-20min to obtain a final product.

Technical Field

The invention relates to the field of coatings, in particular to a high-performance primer-topcoat exterior wall coating for renovating an old wall and a preparation method thereof.

Background

With the continuous development of economic society, people pursue higher and higher living standard, and the beauty of buildings is concerned widely.

Based on the low-carbon environmental protection policy, the old house renovation becomes a social trend, and in order to meet the requirements of renovating the old wall, a high-performance primer-topcoat exterior wall coating with excellent adhesive force is needed.

Disclosure of Invention

Technical problem to be solved

In order to solve the problems in the prior art, the invention provides a high-performance primer-topcoat exterior wall coating for renovating old walls and a preparation method thereof.

(II) technical scheme

In order to achieve the purpose, the invention adopts the main technical scheme that:

a high-performance primer-topcoat exterior wall coating for renovating old walls is composed of the following raw materials in parts by weight:

further, the hydroxyethyl cellulose is a nonionic soluble cellulose ether.

Further, the defoaming agent is one or any combination of two of a mineral oil defoaming agent and a silicone defoaming agent.

Further, the dispersant is one or any combination of two of a polycarboxylate sodium salt dispersant and an ammonium salt dispersant.

Further, the wetting agent is a nonionic surfactant.

Further, the titanium dioxide is rutile type titanium dioxide.

A preparation method of a high-performance primer-topcoat exterior wall coating for renovating old walls comprises the following steps:

1) firstly, adding water into a dispersion cylinder, then adding hydroxyethyl cellulose and bentonite at the rotation speed of 300-500 r/min of the dispersion cylinder, then increasing the rotation speed of the dispersion cylinder to 600-800 r/min, stirring for 1-3 min, then adding a defoaming agent, a dispersing agent, a wetting agent and a pH regulator, and continuing stirring for 5-10 min;

2) then adding titanium dioxide, sericite powder, heavy calcium carbonate and calcined kaolin, stirring to a uniform state, scraping the powder on the wall of the dispersion cylinder, adjusting the rotating speed of the dispersion cylinder to 1200-1500 r/min, and stirring for 15-20min until the fineness of the solution is less than or equal to 50 μm;

3) and then adjusting the rotating speed of the dispersion cylinder to 800-1000 r/min, sequentially adding an antifreezing agent, a film-forming aid, a preservative, an anti-mildew agent, a styrene-acrylic emulsion and a polyurethane thickener, and stirring for 15-20min to obtain a final product.

(III) advantageous effects

The invention has the beneficial effects that: the coating meets the national standard requirements of internal and external walls, has good weather resistance, salt-overtaking resistance, alkalinity resistance and water resistance, not only avoids the quality problem caused by mismatching of primer and finish paint in the construction process, but also reduces the construction process and greatly reduces the construction cost.

Through a plurality of experiments, various materials are selected to determine the optimal components and the weight ratio thereof, and the high-performance water-based environment-friendly coating meeting the requirements of primer and finish paint simultaneously is developed; the invention has excellent adhesive force, can be coated on various base materials, and greatly reduces the construction difficulty.

Detailed Description

For a better understanding of the present invention, reference will now be made in detail to the present invention by way of specific embodiments thereof.

A high-performance primer-topcoat exterior wall coating for renovating old walls is composed of the following raw materials in parts by weight:

further, the hydroxyethyl cellulose is a nonionic soluble cellulose ether.

Further, the defoaming agent is one or any combination of two of a mineral oil defoaming agent and a silicone defoaming agent.

Further, the dispersant is one or any combination of two of a polycarboxylate sodium salt dispersant and an ammonium salt dispersant.

Further, the wetting agent is a nonionic surfactant.

Further, the titanium dioxide is rutile type titanium dioxide.

A preparation method of a high-performance primer-topcoat exterior wall coating for renovating old walls comprises the following steps:

1) firstly, adding water into a dispersion cylinder, then adding hydroxyethyl cellulose and bentonite at the rotation speed of 300-500 r/min of the dispersion cylinder, then increasing the rotation speed of the dispersion cylinder to 600-800 r/min, stirring for 1-3 min, then adding a defoaming agent, a dispersing agent, a wetting agent and a pH regulator, and continuing stirring for 5-10 min;

2) then adding titanium dioxide, sericite powder, heavy calcium carbonate and calcined kaolin, stirring to a uniform state, scraping the powder on the wall of the dispersion cylinder, adjusting the rotating speed of the dispersion cylinder to 1200-1500 r/min, and stirring for 15-20min until the fineness of the solution is less than or equal to 50 μm;

3) and then adjusting the rotating speed of the dispersion cylinder to 800-1000 r/min, sequentially adding an antifreezing agent, a film-forming aid, a preservative, an anti-mildew agent, a styrene-acrylic emulsion and a polyurethane thickener, and stirring for 15-20min to obtain a final product.

The invention selects the high-quality styrene-acrylic emulsion, and still has a proper amount of polar groups which can interact with the polar groups on the surface of the coated object under the mutual cross-linking of the formed paint film, thereby improving the adhesive force of the paint; by adjusting the proportion of each component in the formula, the particles in the paint film are effectively bonded together, the risk of cracks of the paint film is reduced, and the salt and alkali resistance of the paint is improved.

Example 1

A high-performance primer-topcoat exterior wall coating for renovating old walls is prepared from the following components in parts by weight:

a preparation method of a high-performance primer-topcoat exterior wall coating for renovating old walls comprises the following steps:

1) firstly, adding water into a dispersion cylinder, sequentially adding hydroxyethyl cellulose and bentonite at the rotating speed of 300r/min, then increasing the rotating speed to 600r/min, stirring for 1min, then adding a defoaming agent, a dispersing agent, a wetting agent and a pH regulator, and continuously stirring for 5 min;

2) then adding titanium dioxide, mica powder, heavy calcium carbonate and calcined kaolin, stirring to a uniform state, scraping the powder on the wall of the cylinder, adjusting the rotating speed to 1200r/min, and stirring for 15min until the fineness is less than or equal to 50 mu m;

3) and then adjusting the rotating speed to 800r/min, sequentially adding an antifreezing agent, a film forming aid, a preservative, an anti-mildew agent, a styrene-acrylic emulsion and a polyurethane thickener, and stirring for 15min to obtain a final product.

Example 2

A high-performance primer-topcoat exterior wall coating for renovating old walls is prepared from the following components in parts by weight:

a preparation method of a high-performance primer-topcoat exterior wall coating for renovating old walls comprises the following steps:

1) firstly, adding water into a dispersion cylinder, then adding hydroxyethyl cellulose and bentonite at the rotating speed of 500r/min, then increasing the rotating speed to 800r/min, stirring for 3min, then adding a defoaming agent, a dispersing agent, a wetting agent and a pH regulator, and continuously stirring for 10 min;

2) then adding titanium dioxide, mica powder, heavy calcium carbonate and calcined kaolin, stirring to a uniform state, scraping the powder on the wall of the cylinder, adjusting the rotating speed to 1000r/min, and stirring for 20min until the fineness is less than or equal to 50 mu m;

3) and then adjusting the rotating speed to 1000r/min, sequentially adding an antifreezing agent, a film forming aid, a preservative, an anti-mildew agent, a styrene-acrylic emulsion and a polyurethane thickener, and stirring for 20min to obtain a final product.

Example 3

A high-performance primer-topcoat exterior wall coating for renovating old walls is prepared from the following components in parts by weight:

a preparation method of a high-performance primer-topcoat exterior wall coating for renovating old walls comprises the following steps:

1) firstly, adding water into a dispersion cylinder, then adding hydroxyethyl cellulose and bentonite at the rotating speed of 500r/min, then increasing the rotating speed to 800r/min, stirring for 3min, then adding a defoaming agent, a dispersing agent, a wetting agent and a pH regulator, and continuously stirring for 10 min;

2) then adding titanium dioxide, mica powder, heavy calcium carbonate and calcined kaolin, stirring to a uniform state, scraping the powder on the wall of the cylinder, adjusting the rotating speed to 1000r/min, and stirring for 20min until the fineness is less than or equal to 50 mu m;

3) and then adjusting the rotating speed to 1000r/min, sequentially adding an antifreezing agent, a film forming aid, a preservative, an anti-mildew agent, a styrene-acrylic emulsion and a polyurethane thickener, and stirring for 20min to obtain a final product.

Example 4

A high-performance primer-topcoat exterior wall coating for renovating old walls is prepared from the following components in parts by weight:

a preparation method of a high-performance primer-topcoat exterior wall coating for renovating old walls comprises the following steps:

1) firstly, adding water into a dispersion cylinder, then adding hydroxyethyl cellulose and bentonite at the rotating speed of 500r/min, then increasing the rotating speed to 800r/min, stirring for 3min, then adding a defoaming agent, a dispersing agent, a wetting agent and a pH regulator, and continuously stirring for 10 min;

2) then adding titanium dioxide, mica powder, heavy calcium carbonate and calcined kaolin, stirring to a uniform state, scraping the powder on the wall of the cylinder, adjusting the rotating speed to 1000r/min, and stirring for 20min until the fineness is less than or equal to 50 mu m;

3) and then adjusting the rotating speed to 1000r/min, sequentially adding an antifreezing agent, a film forming aid, a preservative, an anti-mildew agent, a styrene-acrylic emulsion and a polyurethane thickener, and stirring for 20min to obtain a final product.

The method focuses on the performance of the adhesive force of the high-performance primer-topcoat exterior wall coating, and is used for evaluating the adaptability of the product to different base materials by combining with a practical set related test scheme:

the asbestos-free fiber cement slab and the bottom surface are combined into an outer wall coating as a base material 1;

the asbestos-free fiber cement slab, the exterior wall putty and the bottom surface are combined into an exterior wall coating to be used as a base material 2;

the old base material and the bottom surface are combined into an outer wall coating.

The exterior wall putty is the exterior wall thick bottom putty of three trees.

1) The experimental environment is as follows: the state regulation of the base material and the temperature and humidity of the experiment meet the regulation of GB/T928;

2) treating a base material, namely treating an asbestos-free fiber cement flat plate [430mm x 150mm x (4-6) mm ], according with the requirement of NAF H V grade in JC/T412.1-2006, and treating according to the regulation of 10.2 in GB/T9271-2008;

treating an old base material:

the wall surface condition is checked before coating, and corresponding treatment is carried out according to different surface defects to ensure that the outer wall surface is firm, dry, clean and free of floating ash.

The five-year old base material containing oil stain, floating ash, hollowing or cracks is used as the base material 3 for removing the floating ash and removing the positions such as sand and raised skin, and the rest parts with good firmness and no defects can be directly recoated;

the old substrate of ten years, as the substrate 4, is subjected to surface treatment according to the pulverization degree, when the pulverization degree is serious, the old substrate needs to be completely removed, then the wall surface is polished by a steel brush and abrasive paper, the putty with soft texture is usually sandpaper with 400-.

The fifteen-year old base material is taken as the base material 5, shoveled to the bottom of the wall, and then is scraped twice by using putty, the putty with higher particle fineness and harder texture is preferably selected, and a certain amount of white latex can be added into the putty to improve the hardness of the putty.

3) Putty scraping: the first putty scraping is mainly used for filling up the depressions, air holes, sand holes and other defects of the wall surface, namely local leveling. And the putty is scraped for the second time at night mainly by integral leveling, and finally the requirement of flatness is met. Polishing once by using 320# abrasive paper at night, and then polishing for the second time by using 400# abrasive paper, wherein the trace of polishing the abrasive paper is eliminated as much as possible;

4) and (3) bottom-surface integrated exterior wall coating construction: brushing and constructing for two times according to the coating rate requirement [ (200-250) g/m2], and drying for 24 h;

5) adhesion force experiment:

and (4) carrying out adhesion test on the surfaces of different base materials by adopting a grid cutting method.

Table 1 shows the adhesion performance test data of the primer-topcoat exterior wall coating prepared by the invention:

as can be seen from Table 1, the high-performance primer-topcoat exterior wall coating prepared by the invention has excellent adhesion, wherein the best scheme is shown in example 4.

The performance evaluation of the related primer is carried out on the samples of the high-performance primer-topcoat exterior wall coating examples 1, 2, 3 and 4 prepared by the invention according to the detection requirements of JGT 210-2018 primer for interior and exterior walls of buildings.

Table 2 shows the performance test data of the primer for primer-topcoat integrated exterior wall coating prepared by the invention:

and (3) performing complementary performance evaluation on related finish paint on samples of high-performance primer-topcoat integrated exterior wall paint examples 1, 2, 3 and 4 prepared by the invention according to the detection requirements of GB/T9755-.

Table 3 shows the test data of the performance of the primer-topcoat paint for the exterior wall prepared by the invention:

as can be seen from Table 1, the high-performance primer-topcoat exterior wall coating for renovating old walls, prepared by the invention, has excellent adhesive force performance; as can be seen from tables 2 and 3, the high-performance primer-topcoat exterior wall coating for renovating old walls, which is prepared by the invention, has other performances meeting the design indexes of exterior wall primers and exterior wall topcoats.

The primer-topcoat integrated exterior wall coating produced by the method can further produce a series of functional primer-topcoat integrated exterior wall coatings, and is further opened and utilized.

The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.