An interior wall latex paint and a preparation method thereof

Abstract

The present application provides an interior wall latex paint and a preparation method thereof, raw materials comprising activated calcium carbonate; the preparation method of the activated calcium carbonate comprises: adding a hemicellulose solution into calcium carbonate, performing ultrasonic dispersion, adding an activator, performing chemical vapor deposition, and then drying, crushing to obtain the activated calcium carbonate; the activator is sodium carbonate and triethanolamine. The activated calcium carbonate prepared by the hemicellulose and the activator through vapor deposition forms a nano modification layer on the surface of the calcium carbonate, improves the active sites of the calcium carbonate, and scientifically proportionally combines components, so that the prepared interior wall latex paint has good coating performance, wherein the washability and alkali resistance are qualified, the paint film is firm and smooth, the interior wall latex paint has high stability in a 30d hot storage process at 60 DEG C, and has good and stable quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of paint preparation, in particular to an interior wall latex paint and a preparation method thereof. BACKGROUND

[0002] The latex paint is a kind of synthetic resin emulsion paint represented by acrylate copolymer emulsion, and the latex paint is a water-dispersible paint, which is prepared by using synthetic resin emulsion as a base material, adding fillers after grinding and dispersing, and adding various additives for finishing. The wall paint is divided into interior wall paint and exterior wall paint, and in general, the exterior wall paint is based on the interior wall paint and has increased weather resistance. The interior wall paint has increased wash resistance. The interior wall paint and the exterior wall paint have different standards, similar formulations but different contents of additives, fillers, emulsions and the like, and the obtained latex paint has different performances. In order to achieve better wash resistance, the content of film-forming additives, emulsions and fillers is usually increased, which not only leads to an increase in production cost, but also reduces the environmental friendliness of the latex paint due to the volatile organic compounds in the film-forming additives and the like. Reasonable and scientific selection of fillers, additives and the like components not only guarantees the quality of the latex paint, but also avoids unnecessary cost increase. SUMMARY

[0003] In view of this, the present application aims to provide an interior wall latex paint and a preparation method thereof. The present application reasonably and scientifically selects benzyl lactone, titanium dioxide, dispersants, kaolin, activated calcium carbonate and film-forming additives as components according to the requirements of the interior wall latex paint, and scientifically proportioned to prepare the interior wall latex paint, which has good wash resistance and alkali resistance, good and stable quality, and reduced production cost of the interior wall latex paint.

[0004] The technical scheme of the present application is as follows:

[0005] An interior wall latex paint, raw materials of which include activated calcium carbonate.

[0006] The preparation method of the activated calcium carbonate includes the following steps: adding a hemicellulose solution to calcium carbonate, ultrasonic dispersion, adding an activator, chemical vapor deposition, drying, and crushing to obtain the activated calcium carbonate.

[0007] The activator is sodium carbonate and triethanolamine. The activated calcium carbonate prepared by hemicellulose and the activator through vapor deposition forms a nano modification layer on the surface of the calcium carbonate, improves the active sites of the calcium carbonate, plays a role of skeleton and filling, helps to increase the thickness of the coating paint film, and makes the paint film more firm and smooth.

[0008] Further, the mass-volume ratio of the calcium carbonate, the activator and the hemicellulose solution is 1g:0.1-0.2g:10-15mL, the mass concentration of the hemicellulose solution is 15-20%, and the mass ratio of the sodium carbonate and the Trolamine (TEA) is 5-6:1-2.

[0009] Further, the calcium carbonate contains at least 60% of particles with a particle size of no more than 10μm.

[0010] Further, the ultrasonic power is 500-600W, and the ultrasonic time is 30-40min.

[0011] Further, the temperature of the chemical vapor deposition is 280-320℃, and the time of the chemical vapor deposition is 2-8h.

[0012] Further, the preparation method comprises the following raw materials: 10-25 parts of the styrene-acrylic emulsion, 8-12 parts of the titanium white, 10-20 parts of the kaolin, 12-18 parts of the activated calcium carbonate, 0.4-0.5 parts of the dispersant, 0.5-1.2 parts of the film-forming aid and 45-55 parts of the water.

[0013] Further, the preparation method comprises the following raw materials: 10-25 parts of the styrene-acrylic emulsion, 8-12 parts of the titanium white, 10-20 parts of the kaolin, 12-18 parts of the activated calcium carbonate, 0.4-0.5 parts of the dispersant, 0.5-1.2 parts of the film-forming aid and 45-55 parts of the water.

[0014] Further, the preparation method of the interior wall latex paint comprises the following steps:

[0015] S1: according to the formula, the styrene-acrylic emulsion, the titanium white, the dispersant and the water are mixed and stirred to obtain a premix;

[0016] S2: the kaolin, the activated calcium carbonate and the film-forming aid are added into the premix, and high-speed dispersion is performed to obtain the interior wall latex paint.

[0017] Further, in the step S1, the stirring rate is 600-800r / min, and the stirring time is 10-20min; in the step S2, the high-speed dispersion rate is 4000-6000r / min, and the high-speed dispersion time is 30-40min.

[0018] The application discloses activated calcium carbonate for preparing interior wall latex paint, and a preparation method of the activated calcium carbonate.

[0019] The mass concentration of the hemicellulose solution is 15-20 %.

[0020] The activating agent is sodium carbonate and triethanolamine with a mass ratio of 5-6:1-2.

[0021] In the calcium carbonate, the proportion of particles with a particle size of not more than 10 microns is at least 60 %.

[0022] Compared with the prior art, the application has the following beneficial effects:

[0023] The application selects phenylpropylene emulsion, titanium white powder, dispersant, kaolin, activated calcium carbonate and film forming aid as components, and the prepared interior wall latex paint has good coating performance, wherein the wash resistance and alkali resistance are qualified, the paint film is firm and smooth, the interior wall latex paint has high stability during a 30-day hot storage process under the condition of 60 DEG C, and the quality is good and stable.

[0024] The activated calcium carbonate prepared by the gas phase deposition of hemicellulose and activating agent forms a nano modification layer on the surface of calcium carbonate, improves the active sites of the calcium carbonate, plays a role of skeleton and filling, helps to increase the thickness of the coating paint film, makes the paint film more firm and smooth, and improves the thermal stability of the interior wall latex paint. DETAILED DESCRIPTION

[0025] In order to better understand the technical content of the application, the following specific examples are provided to further illustrate the application.

[0026] Unless otherwise specified, the experimental methods used in the examples of the application are conventional methods.

[0027] Unless otherwise specified, the materials, reagents and the like used in the examples of the application can be obtained from commercial channels.

[0028] The dispersant is purchased from Dow Chemical (China) Co., Ltd., and the type is Kaitai; the film forming aid is purchased from Run Tai New Material Co., Ltd., and the type is RTC290A.

[0029] Example 1-activated calcium carbonate

[0030] Preparation of activated calcium carbonate: take 100 g of ground calcium carbonate (particles with a particle size below 10 μm account for 68%), add 1 L of a hemicellulose solution with a mass concentration of 20%, ultrasonic dispersion for 30 min at an ultrasonic power of 600 W, then add 10 g of Na2CO3 and 2 g of TEA as activators together in the solution, place in a vapor deposition furnace, perform vapor deposition under inert gas, deposition temperature is 280℃, deposition time is 5 h, dry, grind again, and obtain activated calcium carbonate.

[0031] Example 2 - activated calcium carbonate

[0032] Preparation of activated calcium carbonate: take 100 g of ground calcium carbonate (particles with a particle size below 10 μm account for 68%), add 1.5 L of a hemicellulose solution with a mass concentration of 15%, ultrasonic dispersion for 30 min at an ultrasonic power of 600 W, then add 15 g of Na2CO3 and 5 g of TEA as activators together in the solution, place in a vapor deposition furnace, perform vapor deposition under inert gas, deposition temperature is 280℃, deposition time is 5 h, dry, grind again, and obtain activated calcium carbonate.

[0033] Example 3 - activated calcium carbonate

[0034] Preparation of activated calcium carbonate: take 100 g of ground calcium carbonate (particles with a particle size below 10 μm account for 68%), add 1 L of a hemicellulose solution with a mass concentration of 20%, ultrasonic dispersion for 40 min at an ultrasonic power of 500 W, then add 10 g of Na2CO3 and 2 g of TEA as activators together in the solution, place in a vapor deposition furnace, perform vapor deposition under inert gas, deposition temperature is 320℃, deposition time is 8 h, dry, grind again, and obtain activated calcium carbonate.

[0035] Comparative Example 1 - modified calcium carbonate

[0036] Preparation of modified calcium carbonate: take 100 g of ground calcium carbonate (particles with a particle size below 10 μm account for 68%), add 200 g of distilled water, 10 g of anhydrous ethanol, and 80 g of ethyl silicate, adjust pH with ammonia water, stir and react, heat to 150℃ for 2 h, grind, and obtain modified calcium carbonate.

[0037] Example 4 - interior wall latex paint

[0038] Formulation: 140 g of styrene-acrylic emulsion, 100 g of titanium white, 170 g of kaolin, 160 g of activated calcium carbonate, 4 g of dispersant, 6 g of film-forming aid, and 500 g of water.

[0039] Preparation of interior wall latex paint: according to the above formula, first mix the styrene-acrylic emulsion, titanium dioxide, dispersant and water, stir at a low speed of 600-800 r / min, stir for 10 min, then add kaolin, activated calcium carbonate and film-forming aid, increase the speed to 4000-6000 r / min, high-speed dispersion, disperse for 40 min, thus obtaining the interior wall latex paint.

[0040] Test Example 1

[0041] According to the GB / T9266-2009 "Determination of washability of architectural coatings", the washability of the sample was determined. The test panel coated with the interior wall latex paint was dried for 7 d under the conditions specified in GB / T 9278-2008 "Temperature and humidity for conditioning and testing of paint samples". The washing medium was a 0.5% laundry detergent solution prepared by dissolving laundry detergent in distilled water. The product was determined to be qualified if the washing times were greater than 300 times, first-class product if the washing times were greater than 1000 times, and superior product if the washing times were greater than 5000 times. The interior wall latex paint was prepared according to the preparation method of Example 4, using the activated calcium carbonate of Examples 1-3 and the modified calcium carbonate of Comparative Example 1, respectively, and was recorded as products 1, 2, 3 and 4, respectively. The interior wall latex paint prepared using unactivated and modified ground calcium carbonate (particles with a particle size of 10 μm or less accounted for 71%) was used as a control product.

[0042] According to GB / T9265-2009 "Determination of alkali resistance of architectural coatings", the test panel was immersed in saturated calcium hydroxide aqueous solution for 24 h, and the peeling of the coating of the test panel was observed.

[0043] The test results of washability and alkali resistance are shown in the following table.

[0044] Table 1: Results of washability and alkali resistance of interior wall latex paint of each sample

[0045] Product Brushing times Grade Alkali resistance test Product 1 5754 Good product Pass Product 2 5518 Good product Pass Product 3 5660 Good product Pass Product 4 5008 Good product Pass Control product 4550 First-rate product Pass

[0046] Note: The washing times refer to the number of times of washing until the paint peels off

[0047] As can be seen from Table 1 above, the interior wall latex paint prepared using different states of calcium carbonate all has a certain washability, and the interior wall latex paint reaches the first-class product grade. The activated calcium carbonate prepared by gas-phase deposition of hemicellulose and activator improves the active sites of calcium carbonate, and has relatively high improvement performance on the interior wall latex paint, and the product has relatively good washability.

[0048] Example 5 - Interior wall latex paint

[0049] Formulation: styrene-acrylate emulsion 100 g, titanium dioxide 100 g, kaolin 200 g, activated calcium carbonate of Example 1 180 g, dispersant 5 g, film forming aid 10 g and water 550 g.

[0050] Preparation of interior wall latex paint: according to the above formulation, first mix the styrene-acrylate emulsion, titanium dioxide, dispersant and water, stir at a low speed of 600-800 r / min, stir for 10 min, then add kaolin, activated calcium carbonate of Example 1 and film forming aid, increase the speed to 4000-6000 r / min, high speed dispersion for 40 min, thus the interior wall latex paint is obtained.

[0051] Example 6 - interior wall latex paint

[0052] Formulation: styrene-acrylate emulsion 250 g, titanium dioxide 120 g, kaolin 100 g, activated calcium carbonate of Example 1 120 g, dispersant 5 g, film forming aid 10 g and water 550 g.

[0053] Preparation of interior wall latex paint: according to the above formulation, first mix the styrene-acrylate emulsion, titanium dioxide, dispersant and water, stir at a low speed of 600-800 r / min, stir for 10 min, then add kaolin, activated calcium carbonate of Example 1 and film forming aid, increase the speed to 4000-6000 r / min, high speed dispersion for 40 min, thus the interior wall latex paint is obtained.

[0054] Example 7 - interior wall latex paint

[0055] Formulation: styrene-acrylate emulsion 250 g, titanium dioxide 100 g, kaolin 120 g, activated calcium carbonate of Example 1 80 g, dispersant 5 g, film forming aid 10 g and water 550 g.

[0056] Preparation of interior wall latex paint: according to the above formulation, first mix the styrene-acrylate emulsion, titanium dioxide, dispersant and water, stir at a low speed of 600-800 r / min, stir for 10 min, then add kaolin, activated calcium carbonate of Example 1 and film forming aid, increase the speed to 4000-6000 r / min, high speed dispersion for 40 min, thus the interior wall latex paint is obtained.

[0057] Test Example 2

[0058] Results of washability, alkali resistance and appearance of each sample of interior wall latex paint in Table 2

[0059]

[0060]

[0061] Generally in the process of coating drying, the gas discharge produces pinhole-like shrinkage, due to the large volume shrinkage of the coating, the components form agglomeration in local area, leading to the appearance of pinhole phenomenon, there are external factors affecting the appearance of pinhole, the coating pinhole will affect the coating performance of the coating. As can be seen from Table 2 above, the thicker the coating of the coating, the more serious the pinhole phenomenon, the thinner the coating, the smaller the pinhole, and the better the coating performance, the pinhole of product 1 and example 6 is small and the number is very small, example 5 is a little more, improving the styrene-acrylic emulsion can reduce the pinhole phenomenon, the number of pinholes of example 7 is more, and the reduction of activated calcium carbonate cannot make the components such as titanium dioxide and kaolin more evenly distributed, the activated calcium carbonate prepared by gas phase deposition of hemicellulose and activator makes the surface of calcium carbonate form a nano modification layer, improves the active site of calcium carbonate, plays a role of skeleton and filling, helps to increase the thickness of the coating film of the coating film, makes the coating film more firm and flat.

[0062] Test example 3

[0063] According to the conditions specified in GB / T 6753.3-1986 "Test method for storage stability of coatings", the storage stability at 60℃ environment is determined, and the results are as follows.

[0064] Table 2: Results of 30d storage stability of interior wall latex paint

[0065] Product State Product 1 Slightly supernatant precipitated, thickness 0.5 mm Example 5 Supernatant precipitated, thickness 1.5 mm

[0066] As can be seen from Table 3 above, the interior wall latex paint prepared by selecting styrene-acrylic emulsion, titanium dioxide, dispersant, kaolin, activated calcium carbonate and film-forming aid as components and scientific proportioning has high stability in the process of 30d hot storage at 60℃ and good quality.

[0067] The above only describes the preferred embodiments of the present application and does not limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An interior wall latex paint, characterized by, The paint comprises the following raw materials by weight: 10-25 parts of styrene-acrylic emulsion, 8-12 parts of titanium white, 10-20 parts of kaolin, 12-18 parts of activated calcium carbonate, 0.4-0.5 parts of dispersant, 0.5-1.2 parts of film-forming aid and 45-55 parts of water; The preparation method of the activated calcium carbonate comprises the following steps: adding a hemicellulose solution into calcium carbonate, ultrasonic dispersion, adding an activator, chemical vapor deposition, drying, and crushing to obtain the activated calcium carbonate; The activator is sodium carbonate and triethanolamine.

2. An interior wall latex paint according to claim 1, characterized in that, The mass-volume ratio of the calcium carbonate, the activator and the hemicellulose solution is 1 g: 0.1-0.2 g: 10-15 mL, the mass concentration of the hemicellulose solution is 15-20%, and the mass ratio of the sodium carbonate and the triethanolamine is 5-6: 1-2.

3. An interior wall latex paint according to claim 2, wherein In the calcium carbonate, the proportion of particles with a particle size of not more than 10 μm is at least 60%.

4. The interior wall latex paint of claim 1, wherein The power of the ultrasonic is 500-600 W, and the ultrasonic time is 30-40 min.

5. The interior wall latex paint of claim 1, wherein The temperature of the chemical vapor deposition is 280-320 ℃, and the chemical vapor deposition time is 2-8 h.

6. The interior wall latex paint of claim 1, wherein The paint comprises the following raw materials by weight: 10-25 parts of styrene-acrylic emulsion, 8-12 parts of titanium white, 10-20 parts of kaolin, 12-18 parts of activated calcium carbonate, 0.4-0.5 parts of dispersant, 0.5-1.2 parts of film-forming aid and 45-55 parts of water.

7. The preparation method of the interior wall latex paint according to any one of claims 1-6, characterized in that, The method comprises the following steps: S1: according to the formula, mixing styrene-acrylic emulsion, titanium white, dispersant and water, stirring to obtain a premix; S2: adding kaolin, activated calcium carbonate and film-forming aid into the premix, high-speed dispersion to obtain an interior wall latex paint.

8. The method of preparing an interior wall latex paint according to claim 7, characterized in that, In step S1, the stirring rate is 600-800 r / min, and the stirring time is 10-20 min; in step S2, the high-speed dispersion rate is 4000-6000 r / min, and the high-speed dispersion time is 30-40 min.

9. An activated calcium carbonate for use in the preparation of interior wall latex paints, characterized in that, The preparation method of the activated calcium carbonate comprises the following steps: adding a hemicellulose solution into calcium carbonate, ultrasonic dispersion, adding an activator, chemical vapor deposition, drying, and crushing to obtain the activated calcium carbonate; The mass concentration of the hemicellulose solution is 15-20%; The activator is sodium carbonate and triethanolamine with a mass ratio of 5-6: 1-2; In the calcium carbonate, the proportion of particles with a particle size of not more than 10 μm is at least 60%.

Images