阅读说明：本技术 一种低气味、低voc的环保乳胶漆及其制备方法 (Low-odor and low-VOC (volatile organic compound) environment-friendly latex paint and preparation method thereof ) 是由 曹庆伟 杨暘 赵华云 邓万礼 于 2019-12-04 设计创作，主要内容包括：本发明涉及一种低气味、低VOC的环保乳胶漆,包括按重量份算包含组分：成膜物质30~40份,成膜物质主要为高玻璃化温度低成膜温度改性苯丙乳液与低成膜温度改性醋丙乳液的组合；颜填料40~45份；涂料助剂4~6份；稀释用水,填料中包括一种碳纳米管/四针状氧化锌晶须。还公开了低气味、低VOC的环保乳胶漆的制备方法。本发明达到的有益效果是：吸收分解甲醛、抗菌、低气味、低VOC。(The invention relates to a low-odor and low-VOC (volatile organic compound) environment-friendly latex paint which comprises the following components in parts by weight: 30-40 parts of a film forming material, wherein the film forming material is mainly a combination of a high-glass transition temperature low-film forming temperature modified styrene-acrylic emulsion and a low-film forming temperature modified vinyl acetate-acrylic emulsion; 40-45 parts of pigment and filler; 4-6 parts of a coating additive; diluting with water, and filling material including carbon nanotube/tetrapod-like zinc oxide whisker. Also discloses a preparation method of the low-odor and low-VOC environment-friendly latex paint. The invention achieves the following beneficial effects: absorbing and decomposing formaldehyde, antibiosis, low odor and low VOC.)

1. The low-odor and low-VOC environment-friendly latex paint is characterized in that: the composition comprises the following components in parts by weight:

30-40 parts of a film forming substance;

40-45 parts of pigment and filler;

4-6 parts of a coating additive;

water is used for dilution.

2. The low odor, low VOC, environmentally friendly latex paint of claim 1, wherein: the film forming matter is the combination of a modified styrene-acrylic emulsion with high glass transition temperature and low film forming temperature and a modified vinyl acetate-acrylic emulsion with low film forming temperature.

3. The low odor, low VOC, environmentally friendly latex paint of claim 2, wherein: the film-forming material does not contain a film-forming aid.

4. The low odor, low VOC, environmentally friendly latex paint of claim 3, wherein: the coating auxiliary agent comprises one or more of a dispersing agent, a defoaming agent, a thickening agent, a pH regulator, a mildew preventive and a preservative.

5. The low odor, low VOC, environmentally friendly latex paint of claim 4, wherein: the coating auxiliary agent also comprises an improver, and the improver is AMP-95.

6. The low odor, low VOC, environmentally friendly latex paint of claim 4, wherein: the pigment and filler comprises one or more of titanium dioxide, barium sulfate and zinc oxide, and also comprises one or a combination of kaolin, diatomite and tetrapod-like zinc oxide whiskers.

7. The low odor, low VOC, environmentally friendly latex paint of claim 6, wherein: the pigment and filler also comprises one or a combination of silicon dioxide, titanium dioxide and tetrapod-like zinc oxide whiskers.

8. A preparation method of low-odor and low-VOC environment-friendly latex paint is characterized by comprising the following steps: the preparation method comprises the following steps:

s1, adding water into the premixing dispersion tank, controlling the rotating speed at 800r/min, adding the thickening agent, the dispersing agent and part of the defoaming agent, and stirring;

s2, adding the pigment and filler into the dispersion tank at a low speed in a dispersion state, increasing the rotation speed to 950-;

s3, stopping dispersing when all the raw materials in the dispersing tank are dispersed to be slurry, and forming premixed slurry;

s4, pouring the premixed slurry obtained in the step S4 into a paint mixing cylinder, putting AMP-95 into the paint mixing cylinder, adjusting the rotating speed to 1400-1600 r/min, and fully dispersing until the fineness of the premixed slurry reaches the standard;

s5, after the dispersion and the breaking, reducing the rotating speed to 800r/min, sequentially adding film forming substances, and fully dispersing;

s6, sequentially adding the preservative, the mildew preventive and the residual defoaming agent, and stirring to eliminate small bubbles generated in the dispersing process;

and S7, adjusting the viscosity, adding water, pulling and stirring for multiple times, and adjusting the viscosity to an index range.

9. The method for preparing low odor, low VOC environmental protection latex paint according to claim 1, characterized in that: in step S5, water needs to be added many times during the dispersion, and the slurry temperature is controlled below 50 ℃.

10. The method of claim 8 for preparing low odor, low VOC environmental latex paint, wherein: in the step S2, the stirring time is 2-5 min;

in the step S6, the time for sufficient dispersion is 4-6 min;

in the step S7, the time for dispersing and stirring is 2-4 min.

Technical Field

The invention relates to the technical field of environment-friendly emulsion paints, in particular to a low-odor and low-VOC environment-friendly emulsion paint and a preparation method thereof.

Background

The film formation of latex paints is caused by the dissolution of the particle packing therein, and whether or not the film formation is sufficient directly affects the performance of the coating film. As the film forming quality of the latex paint directly influences the adhesion force to the surface of a substrate, the elasticity of a coating, the effect and the luster of a film, the water resistance and the durability of the paint and other factors in the later period, except that a high-pressure airless sprayer is adopted for construction during construction to fully atomize the paint and form a better film, most latex paint products are added with a film forming auxiliary agent to help the film formation. And film aids as one of the VOCs, most companies reduce the VOC content by using high boiling point film aids. However, the high boiling point film-forming agents developed and used by most companies today are not defined as VOCs, and are still volatile to the air and have an effect on the environment as organic substances in practice.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide the low-odor and low-VOC environment-friendly latex paint which can accelerate the volatilization of organic matters, can decompose the organic matters and has good complexation property and a preparation method thereof.

The purpose of the invention is realized by the following technical scheme: the low-odor and low-VOC environment-friendly latex paint comprises the following components in parts by weight:

30-40 parts of a film forming substance;

40-45 parts of pigment and filler;

4-6 parts of a coating additive;

the film forming matter is the combination of a modified styrene-acrylic emulsion with high glass transition temperature and low film forming temperature and a modified vinyl acetate-acrylic emulsion with low film forming temperature.

Further, the film-forming material does not contain a film-forming aid.

Further, the coating auxiliary agent comprises one or more of a dispersing agent, a defoaming agent, a thickening agent, a pH regulator, a mildew preventive and a preservative.

Preferably, the coating auxiliary agent further comprises an improver, and the improver is AMP-95.

Furthermore, the pigment and filler comprises one or more of titanium dioxide, barium sulfate and zinc oxide, and also comprises one or a combination of kaolin, diatomite and tetrapod-like zinc oxide whiskers.

Furthermore, the pigment and filler also comprises one or a combination of silicon dioxide, titanium dioxide and tetrapod-like zinc oxide whiskers.

A preparation method of low-odor and low-VOC environment-friendly latex paint comprises the following preparation steps:

s1, adding water into the premixing dispersion tank, controlling the rotating speed at 800r/min, adding the thickening agent, the dispersing agent and part of the defoaming agent, and stirring;

s2, adding the pigment and filler into the dispersion tank at a low speed in a dispersion state, increasing the rotation speed to 950-;

s3, stopping dispersing when all the raw materials in the dispersing tank are dispersed to be slurry, and forming premixed slurry;

s4, pouring the premixed slurry obtained in the step S4 into a paint mixing cylinder, putting AMP-95 into the paint mixing cylinder, adjusting the rotating speed to 1400-1600 r/min, and fully dispersing until the fineness of the premixed slurry reaches the standard;

s5, after the dispersion and the breaking, reducing the rotating speed to 600-800r/min, sequentially adding the main film-forming substance and the secondary film-forming substance in the step S1, and fully dispersing;

s6, sequentially adding the preservative, the mildew preventive and the residual defoaming agent, and stirring to eliminate small bubbles generated in the dispersing process;

and S7, adjusting the viscosity, adding water, pulling and stirring for multiple times, and adjusting the viscosity to an index range.

Preferably, in step S5, water is added for multiple times during the dispersing process, and the slurry temperature is controlled below 50 ℃.

Preferably, in the step S2, the stirring time is 2-5 min; in the step S6, the time for sufficient dispersion is 4-6 min; in step S8, the time for dispersing and stirring is 2-4 min.

The invention has the following advantages: according to the scheme, no film-forming auxiliary agent is added, so that the VOC content is reduced; meanwhile, the combination of the modified styrene-acrylic emulsion with high glass transition temperature and low film forming temperature and the modified vinyl acetate-acrylic emulsion with low film forming temperature is adopted, so that the scheme can normally form a film in an environment with the temperature of more than 5 ℃ under the condition of not adding a film auxiliary agent, and the performance of the paint film is good; finally, the carbon nano tube/tetrapod-like zinc oxide crystal whisker serving as the filler in the scheme can adsorb and decompose formaldehyde, and meanwhile, the antibacterial function of a paint film can be enhanced, metal ions are not released, and the safety is high.

Detailed Description

The present invention is further described below, but the scope of the present invention is not limited to the following.

The low-odor and low-VOC environment-friendly latex paint comprises the following components in parts by weight: 30 parts of a film-forming material; 40 parts of pigment and filler; 4 parts of a coating additive; water is used for dilution.

In the scheme, the film forming substance is a combination of a modified styrene-acrylic emulsion with high glass transition temperature and low film forming temperature and a modified vinyl acetate-acrylic emulsion with low film forming temperature, preferably, the styrene-acrylic emulsion is Bai calendar TM (PRIMALTM) NPE9373 of the Dow company and accounts for 28 parts, and the vinyl acetate-acrylic emulsion is preferably NP 96 of the Dow company and accounts for 2 parts.

The coating auxiliary agent comprises one or more of a dispersing agent, a defoaming agent, a thickening agent, a pH regulator, a mildew preventive and a preservative. The paint auxiliary agent also comprises an improver, wherein the improver is AMP-95, and AMP-95 is adopted because the improver can effectively control the pH value and has the functions of dispersing, defoaming, thickening and reducing the smell of the paint.

In the present example, 0.8 part of AMP-95 was included in the paint adjuvant.

The pigment and filler comprises one or more of titanium dioxide, barium sulfate and zinc oxide, and also comprises one or a combination of kaolin, diatomite and tetrapod-like zinc oxide whiskers. The pigment and filler also comprises one or a combination of silicon dioxide and titanium dioxide, and the components such as the silicon dioxide and the titanium dioxide are adopted, so that the pigment and filler has the function of whitening in order to avoid fine gray scale brought by aluminum powder.

In this example, the pigment filler is 25 parts of a combination of silica and titanium dioxide, preferably, the silica is TIPURE R-902+ from kemu corporation, and the tetrapod-like zinc oxide whiskers account for 1 part.

The preparation method of the low-odor and low-VOC environment-friendly latex paint comprises the following steps:

s1, adding water into the premixing dispersion tank, controlling the rotating speed at 800r/min, adding the thickening agent, the dispersing agent and part of the defoaming agent, and stirring;

s2, adding the pigment and filler into the dispersion tank at a low speed in a dispersion state, increasing the rotation speed to 950-;

s3, stopping dispersing when all the raw materials in the dispersing tank are dispersed to be slurry, and forming premixed slurry;

s4, pouring the premixed slurry obtained in the step S4 into a paint mixing cylinder, putting AMP-95 into the paint mixing cylinder, adjusting the rotating speed to 1400-1600 r/min, and fully dispersing until the fineness of the premixed slurry reaches the standard;

s5, after the dispersion and the breaking, reducing the rotating speed to 600-800r/min, sequentially adding the main film-forming substance and the secondary film-forming substance in the step S1, and fully dispersing;

s6, sequentially adding the preservative, the mildew preventive and the residual defoaming agent, and stirring to eliminate small bubbles generated in the dispersing process;

and S7, adjusting the viscosity, adding water, pulling and stirring for multiple times, and adjusting the viscosity to an index range.

Preferably, in step S5, water is added for multiple times during the dispersing process, and the slurry temperature is controlled below 50 ℃.

Preferably, in the step S2, the stirring time is 2-5 min; in the step S6, the time for sufficient dispersion is 4-6 min; in step S8, the time for dispersing and stirring is 2-4 min.

Now, the latex paint prepared in this example is used for the test experiment, and the test results are shown in table one. As can be seen from the table I, the conventional performance of the latex paint in the scheme meets the performance requirements of JG/T9756-.

Table-test experimental result table