CN112625513A

CN112625513A - Low-temperature film-forming zero-water-absorption sand wall-shaped building coating and preparation method thereof

Info

Publication number: CN112625513A
Application number: CN201910904416.9A
Authority: CN
Inventors: 马安荣; 黄银庆; 梁乃文; 池钟慷; 胡祥顺
Original assignee: Shanghai Sani Coating Making Co ltd; Shanghai Sanin Coating Technology Co ltd
Current assignee: Shanghai Sani Coating Making Co ltd; Shanghai Sanin Coating Technology Co ltd
Priority date: 2019-09-24
Filing date: 2019-09-24
Publication date: 2021-04-09

Abstract

The invention relates to a low-temperature film-forming zero-water-absorption sand wall-shaped building coating, which comprises the following components in percentage by mass: 20.20-26.05% of building coating sand wall-shaped emulsion, 0.18-0.23% of hydroxypropyl methyl cellulose, 0.06-0.08% of organic amine neutralizer, 0.60-0.65% of defoaming agent, 0.30-1.05% of inert water-blocking agent, 0.66-0.72% of antifreezing agent, 1.10-1.36% of film-forming additive, 0.22-0.24% of bactericide, 0.55-0.75% of thickening agent, 60.00-67.00% of 40-80 mesh natural colored sand and 8.0-10.0% of water. The invention also provides a preparation method of the low-temperature film-forming sand wall-shaped building coating with zero water absorption.

Description

Low-temperature film-forming zero-water-absorption sand wall-shaped building coating and preparation method thereof

Technical Field

The invention relates to a coating, in particular to a low-temperature film-forming sand wall-shaped building coating with zero water absorption and a preparation method thereof.

Background

With the continuous regulation and control of real estate scheduling policies in China, the concentration of real estate development enterprises in China is higher and higher. Projects developed for real estate on large and medium-sized scales tend to be spread across cities throughout the country. Because of the wide territory in China, the temperature and the precipitation of each place in the same period are obviously different from the coastal line of southeast to the inland of the west. In recent years, sand wall-shaped architectural coatings have been widely used in real estate development enterprises in order to improve the decorative effect and the convenience of construction in architectural engineering. In the face of application environments with wide regions and large differences of air temperature and precipitation, the sand-wall building coatings on the market at present have poor film forming performance in low-temperature and continuous rainy environments, and paint film ill conditions such as cracking, blooming and color difference of the coatings usually occur, so that the decoration and protection of the coatings are influenced. The main reason for this is that such coatings are relatively thick and have poor film forming properties in the low temperature environment during the initial drying without forming a continuous paint film. When the water is in a continuous rain period, the water absorption capacity is too large, so that rain and the like are etched to generate a film morbid state.

How to develop a sand wall-shaped building coating overcomes the defects that the existing sand wall-shaped building coating has poor film-forming property when applied in a low-temperature and continuous rainy environment, and the coating usually has film defects of cracking, blooming, color difference and the like, thereby affecting the decoration and protection of the coating. The main reason for this is that such coatings are relatively thick and have poor film forming properties in the low temperature environment during the initial drying without forming a continuous paint film. When the water is in a continuous rain period, the water absorption capacity is too large, so that rain and the like are etched to generate a film morbid state.

The product can resist low temperature in the early drying process, and has good low-temperature film forming property. The water absorption capacity is zero, so that a continuous paint film can be formed in a rain period. The coating has the advantages that the coating can meet the requirements of excellent film-forming performance in a low-temperature environment and application in an environment with a lasting rainy period, and the zero water absorption capacity of the coating so as to keep the performance of the coating is the technical problem to be solved by sand textured coating developers.

Disclosure of Invention

The invention aims to solve the technical problems that the existing sand-wall building coating has poor film-forming property when applied in low-temperature and continuous rainy environment, and paint film ill conditions such as cracking, blooming, color difference and the like usually occur on a coating, so that the decoration and the protection of the coating are influenced. The main reason for this is that such coatings are relatively thick and have poor film forming properties in the low temperature environment during the initial drying without forming a continuous paint film. When the water is in a continuous rain period, the water absorption capacity is too large, so that rain and the like are etched to generate a film morbid state. The product can resist low temperature in the early drying process and has good low-temperature film forming property. The water absorption capacity is zero, so that a continuous paint film can be formed when the water-absorbing material is subjected to a lasting overcast and rainy period. Namely, the application in the environment with low temperature and continuous overcast and rainy period can be satisfied. The paint film of the paint has excellent performances of alkali resistance, artificial climate aging resistance and the like, and the low-temperature film-forming sand wall-shaped building paint with zero water absorption is a non-dangerous article and has no strict fire-proof requirements on production, transportation and storage. The preparation method of the product has simple process, has no adverse effect on operators during production, and is suitable for industrial production.

The invention solves the technical problems through the following technical scheme.

The invention provides a low-temperature film-forming sand wall-shaped building coating with zero water absorption capacity, which comprises the following components in percentage by mass: 20.20-26.05% of building coating sand wall-shaped emulsion, 0.18-0.23% of hydroxypropyl methyl cellulose, 0.06-0.08% of organic amine neutralizer, 0.60-0.65% of defoaming agent, 0.30-1.05% of inert water-blocking agent, 0.66-0.72% of antifreezing agent, 1.10-1.36% of film-forming additive, 0.22-0.24% of bactericide, 0.55-0.75% of thickening agent, 60.00-67.00% of 40-80 mesh natural colored sand and 8.0-10.0% of water.

The building coating sand wall emulsion can be a conventional sand wall building coating emulsion in the field, the volatile organic compound (VOC for short) of the building coating sand wall emulsion is preferably below 20g/L, the adhesive force is preferably less than or equal to 1 grade, the solid content is 48 +/-2 percent, and the building coating sand wall emulsion is excellent in low-temperature film-forming property, quick-drying property and super-small particle size. The sand wall emulsion of the architectural coating is preferably ENCOR DT250, ENCOR 6430 or shinning XG-661 emulsion of Akoma.

Wherein, the hydroxypropyl methyl cellulose is conventionally used in the field, and the appearance of the hydroxypropyl methyl cellulose is white or white-like powder, the methoxyl content is 28 to 30 percent, the hydroxypropoxyl content is 7 to 12 percent, the gel temperature is 58 to 65 ℃, the pH value is 5.0 to 7.5, the viscosity (2 percent aqueous solution, 20 ℃) is 80000-100000mPa.s, the drying weight loss is less than or equal to 5.0 percent, and the burning residue (calculated by sulfate) is less than or equal to 1.5 percent. HPMC produced by Hebei Xingtai cellulose Co., Ltd is preferred.

Wherein, the organic amine neutralizer can be low-odor, which is conventionally used in the field, can effectively replace ammonia water and 2-amino-2 methyl-1-propanol and is used for adjusting the pH value of the latex paint. The appearance is light yellow to colorless liquid, the neutralization value is more than or equal to 270mgKOH/g, and the flash point is more than or equal to 90 ℃. The organic amine neutralizer is preferably a multifunctional additive HT-96 produced by break-Thai chemical company in Nantong City.

The defoaming agent can be mineral oil hydrophobic fumed silica and metal soap defoaming agents which are conventionally used in the field, the defoaming agent is light yellow uniform liquid in appearance, has slight ester fragrance, has the viscosity of 300-900 mPa.s (25 ℃) with 100% of effective components and the pH value of 6-8, has excellent defoaming and foam inhibiting effects, and is good in compatibility and high in safety. Preferably NXZ as a defoaming agent produced by break Thailand chemical Co., Ltd, Nantong, SN-NXZ in Taiwan, China Asia.

The inert water-blocking agent is an auxiliary agent which can be mutually soluble with water, is inert in water paint, and can increase the compactness of a coating in the paint film drying process after the paint is constructed, so that the water can be prevented from entering the coating. Such as YT-908 type water-resisting agent and YT-909 type high-efficiency separating agent of the company Yitai chemical materials Limited.

The antifreeze can be an antifreeze conventionally used in the art, and is preferably propylene glycol and/or ethylene glycol.

Wherein the film-forming assistant can be a film-forming assistant of colorless transparent low-odor liquid which is conventionally used in the field, and the film-forming assistant containsThe content is more than or equal to 99 percent, and the density (20 ℃) is 0.95g/cm³The acidity (calculated by isobutyric acid) is less than or equal to 0.5 percent, the water content is less than or equal to 0.1 percent, the compactness of a paint film can be ensured, and the latex paint can achieve good paint film performance when being dried at low temperature and in continuous rainy days. Preferably a dodecyl alcohol ester produced by Jiangsu Runtai Chemicals, Inc.

The bactericide can be an efficient, broad-spectrum and environment-friendly antiseptic bactericide which is conventionally used in the field, has a fast and efficient sterilization and antiseptic effect, is effective in a wider pH value range (less than 9.5), has no stimulation to human bodies in a use concentration range, does not contain heavy metal and other toxic and harmful components, has a broad-spectrum and efficient inhibition and killing effect on microorganisms such as bacteria, actinomycetes and fungi (saccharomycetes and mycete), is a light yellow or yellow green transparent liquid in appearance, has the effective component more than or equal to 2.5 percent and has the density (20 ℃) of 1.00-1.10 g/ml. Preferably an antiseptic bactericide YN-188 produced by Baoding sunshine auxiliary company Limited.

Wherein, the thickening agent can be a polyurethane thickening agent which is conventionally used in the field, has unique pseudoplastic rheological property and excellent performance at medium shear and high shear, and can ensure that the system obtains higher in-tank viscosity. Preferably SD-15-P thickener produced by Guangzhou Sande chemical Co.

Wherein, the natural color sand of 40-80 meshes is sieved and screened by a stainless steel grading screen with corresponding meshes, so that the mass ratio of the upper sieve to the lower sieve of the natural color sand sieved and screened is not higher than 5 percent, and the mass ratio of the lower sieve is not higher than 20 percent. The natural color sand has the advantages of good mechanical stability, complete product packaging, clear identification and no rain. The product does not fade after being boiled in boiling water for 1 hour, and does not pulverize and discolor after being resistant to artificial climate aging for 600 hours. Preferably natural color sand produced by Yongshun mineral product processing factory in Lingshu county, Koxing mineral product processing factory in Lingshu county in Hebei province, and Shijiazhuang Xinliang natural color sand factory. The color of the natural colored sand can be selected in a product catalog of a supplier or on the request of a client.

Wherein, the water can be water which is conventional in the field, and is preferably deionized water.

The invention also provides a preparation method of the low-temperature film-forming thickness zero-water-absorption sand wall-shaped building coating, which comprises the following steps: according to the conventional preparation method of the sand wall-shaped building coating in the field, all the components in the raw material formula are uniformly mixed.

In the invention, the preparation method is preferably carried out according to the following steps:

(1) stirring the hydroxypropyl methyl cellulose, 50.0-80.0% of deionized water, 30.0-50.0% of organic amine neutralizer and 30.0-50.0% of defoaming agent at a high speed of 1200-1500 rpm for 15-20 minutes to obtain a mixed solution A;

(2) adding the rest of organic amine neutralizer, the bactericide, the building sand wall-shaped emulsion, the film-forming assistant, the antifreezing agent, the inert water-blocking agent, the thickener and the rest of deionized water into the mixed solute A obtained in the step (1) under the stirring state, and stirring at the medium speed of 800-1100 rpm for 5-15 minutes to obtain a mixture B;

(3) and (3) sequentially adding 40-80 meshes of natural colored sand and the rest of the defoaming agent into the mixture B obtained in the step (2) under the stirring state, and stirring at a low speed of 500-700 revolutions per minute for 5-15 minutes to obtain the low-temperature film-forming zero-water-absorption building sand wall-shaped building coating.

Wherein the percentages are mass percentages relative to the mass of each corresponding component.

In the invention, the room temperature is defined by the conventional definition in the field, and is generally 5-40 ℃.

On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.

The invention also provides a maintenance and observation method and a water absorption test method for the low-temperature film-forming property of the low-temperature film-forming thickness zero-water-absorption sand wall-shaped building coating.

The obtained product is added according to the proportion of 2.8kg/m²Six panels were prepared from the same sample, coated on a asbestos-free cement slab of 150mm 70mm 6mm size, conforming to type I JG/T210-2007 wall construction and completely dried (dry film thickness of about 45 μm). Are all immediately placed in (6 +/-1)Drying at the temperature of the environment. After 4h, the paint film was touched with a finger within 30s to three of the panel surfaces, and if it felt somewhat tacky but no paint stuck to the finger, the coated surface was considered dry. If the paint film is stuck on the hand, the coating surface is not dry. And observing the film forming properties of the other three samples, namely whether the paint film has the phenomena of cracking, flowering, shrinkage cavity and the like. If the above-mentioned bad phenomenon does not exist, the coating is judged to have no abnormality in low-temperature film forming property of the coating at 5 ℃. The coating after 144h of continuous drying in the environment was then continuously tested for 24h water absorption as described in JG/T201-2007 appendix A to determine the water absorption of the coating.

The reagents and starting materials used in the present invention are commercially available.

The positive progress effects of the invention are as follows:

1. the low-temperature film-forming zero-water-absorption sand-wall building coating has the decoration function and the protection function of the sand-wall building coating.

2. The product of the invention can be used for scraping construction, and paint mist and paint splashing are not generated in the construction process, so that air pollution and solid waste are not generated.

3. The product of the invention is a thick coating product, but can form a film at continuous low temperature, and the water absorption capacity is 0.

4. The paint film of the product of the invention has excellent performances of alkali resistance, artificial climate aging resistance and the like.

5. The product of the invention belongs to non-hazardous articles, and has no strict fire-proof requirements on production, transportation and storage.

6. The preparation method of the product has simple process, has no adverse effect on operators during production, and is suitable for industrial production.

9. The product of the invention has strong adhesive force and strong repairability.

Detailed Description

The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions.

Sources of raw materials used in the following examples:

building coating sand wall emulsion ENCOR DT 250: producing the arkema;

building coating sand wall emulsion ENCOR 6430: producing the arkema;

sand wall emulsion XG-661 of building coating: water balance, shinyless new materials manufactured by ltd;

hydroxypropyl methylcellulose HPMC: manufactured by Hebei Xingtai cellulose, Inc.;

organic amine neutralizer HT-96: break produced by chemical Limited company of Thai in Nantong City;

defoaming agent NXZ: break produced by chemical Limited company of Thai in Nantong City;

defoaming agent SN-NXZ: taiwan central asia;

inert water-blocking agent YT-908 type water-blocking agent: yitai chemical materials, Inc.;

inert water-blocking agent YT-909 type high-efficiency separation-blocking agent: yitai chemical materials, Inc.;

dodecyl alcohol ester as film-forming assistant: manufactured by Jiangsu Runtai chemical Co., Ltd;

antiseptic bactericide YN-188: baoding sunshine assistant, manufactured by limited company;

thickener SD-15-P: manufactured by Guangzhou Sande chemical Co Ltd;

40-80 mesh natural colored sand: the Lingshou county is produced by mineral product processing factories;

40-80 mesh natural colored sand: production in mineral processing factories of science star in the county of Ling shou of Hebei province;

40-80 mesh natural colored sand: shijiazhuang Xinliang natural color sand factory.

Sand wall architectural coating CS 1016: jinanchuan stone decoration engineering Co., Ltd;

sand wall-shaped building coating HR208 produced by Jiangsu Jingheng new materials science and technology Limited.

Example 1

The raw material formulation (wt%) of the low temperature film-forming, zero water absorption sand wall architectural coating is shown in table 1 below.

TABLE 1 raw material formulation (wt%) of low temperature film-forming zero water absorption sand wall building coating of examples

The preparation method of the zero water absorption sand wall-shaped building coating which is formed into a film at low temperature comprises the following steps:

(1) stirring the hydroxypropyl methyl cellulose, 50.0 percent of deionized water, 30.0 percent of organic amine neutralizer and 30.0 percent of defoaming agent at 1200 revolutions per minute for 20 minutes to obtain a mixed solution A;

(2) adding the rest of organic amine neutralizer, the bactericide, the building sand wall-shaped emulsion, the film-forming assistant, the antifreezing agent, the inert water-blocking agent, the thickener and the rest of deionized water into the mixed solute A obtained in the step (1) under the stirring state, and stirring at the medium speed of 800 revolutions per minute for 15 minutes to obtain a mixture B;

(3) and (3) sequentially adding 40-80 meshes of natural colored sand and the rest of the defoaming agent into the mixture B obtained in the step (2) under a stirring state, and stirring at a low speed of 500 revolutions per minute for 15 minutes.

Example 2

The raw material formulation (wt%) of the low temperature film-forming, zero water absorption sand wall architectural coating is shown in table 2 below.

TABLE 2 raw material formulation (wt%) of low temperature film-forming zero water absorption sand wall building coating of examples

Sand wall-shaped building coatingFeed emulsion ENCOR 6430	22.20％
		Hydroxypropyl methylcellulose HPMC	0.20％
Organic amine neutralizer HT-96	0.07％
		Defoaming agent SN-NXZ	0.62％
Inert water-blocking agent YT-909 type high-efficiency separation-blocking agent	0.40％
		Antifreeze ethylene glycol	0.70％
Dodecyl alcohol ester as film forming assistant	1.30％
		Bactericide YN-188	0.23％
Thickener SD-15-P	0.60％
		40-80 mesh natural color sand	64.68％
Deionized water	9.00％

(1) stirring the hydroxypropyl methyl cellulose, 60.0 percent of deionized water, 40.0 percent of organic amine neutralizer and 40.0 percent of defoaming agent at a high speed of 1300 revolutions per minute for 18 minutes to obtain a mixed solution A;

(2) adding the rest of organic amine neutralizer, the bactericide, the building sand wall-shaped emulsion, the film-forming assistant, the antifreezing agent, the inert water-blocking agent, the thickener and the rest of deionized water into the mixed solute A obtained in the step (1) under the stirring state, and stirring at the medium speed of 1000 revolutions per minute for 10 minutes to obtain a mixture B;

(3) and (3) sequentially adding 40-80 meshes of natural colored sand and the rest of the defoaming agent into the mixture B obtained in the step (2) under a stirring state, and stirring at a low speed of 600 revolutions per minute for 10 minutes.

Example 3

The raw material formulation (wt%) of the low temperature film-forming, zero water absorption sand wall architectural coating is shown in Table 3 below.

TABLE 3 raw material formulation (wt%) of low temperature film-forming zero water absorption sand wall building coating of examples

Sand wall type building coating emulsion XG-661	26.05％
		Hydroxypropyl methylcellulose HPMC	0.18％
Organic amine neutralizer HT-96	0.08％
		Antifoam NXZ	0.60％
Inert water-blocking agent	0.30％
		Antifreezing agent propylene glycol	0.66％
Dodecyl alcohol ester as film forming assistant	1.36％
		Bactericide YN-188	0.22％
Thickener SD-15-P	0.55％
		40-80 mesh natural color sand	60.00％
Deionized water	10.00％

(1) stirring the hydroxypropyl methyl cellulose, 80.0 percent of deionized water, 50.0 percent of organic amine neutralizer and 50.0 percent of defoaming agent at 1500 revolutions per minute for 15 minutes to obtain a mixed solution A;

(2) adding the rest of organic amine neutralizer, the bactericide, the building sand wall-shaped emulsion, the film-forming assistant, the antifreezing agent, the inert water-blocking agent, the thickener and the rest of deionized water into the mixed solute A obtained in the step (1) under the stirring state, and stirring at the medium speed of 1100 revolutions per minute for 5 minutes to obtain a mixture B;

(3) and (3) sequentially adding 40-80 meshes of natural colored sand and the rest of the defoaming agent into the mixture B obtained in the step (2) under the stirring state, and stirring at a low speed of 700 revolutions per minute for 5 minutes.

Comparative example 1:

the raw material formulation (wt%) of the sand wall type architectural coating is shown in Table 4 below.

TABLE 4 raw material formulation (wt%) of sand wall type architectural coating of comparative example 1

Sand wall type building coating emulsion ENCOR DT250	20.20％
		Hydroxypropyl methylcellulose HPMC	0.23％
Organic amine neutralizer HT-96	0.06％
		Antifoam NXZ	0.65％
Inert water-blocking agent YT-908 type water-blocking agent	0.22％
		Antifreezing agent propylene glycol	0.72％
Dodecyl alcohol ester as film forming assistant	1.10％
		Bactericide YN-188	0.24％
Thickener SD-15-P	0.75％
		40-80 mesh natural color sand	67.83％
Deionized water	8.00％

The preparation method of the sand wall-shaped building coating comprises the following steps:

(1) stirring the hydroxypropyl methyl cellulose, 90.0% of deionized water, 60.0-50.0% of organic amine neutralizer and 60.0% of defoaming agent at 1500 revolutions per minute for 25 minutes to obtain a mixed solution A;

(2) adding the rest of organic amine neutralizer, the bactericide, the building sand wall-shaped emulsion, the film forming aid, the antifreezing agent, the inert water-blocking agent, the film forming aid, the antifreezing agent, the thickener and the rest of deionized water into the mixed solute A obtained in the step (1) under the stirring state, and stirring at the medium speed of 700 revolutions per minute for 25 minutes to obtain a mixture B;

(3) and (3) sequentially adding 40-80 meshes of natural colored sand and the rest of the defoaming agent into the mixture B obtained in the step (2) under a stirring state, and stirring at a low speed of 500 revolutions per minute for 20 minutes.

Comparative example 2:

the raw material formulation (wt%) of the sand wall type architectural coating is shown in Table 5 below.

TABLE 5 raw material formulation (wt%) of sand wall type architectural coating of comparative example 2

(2) adding the rest of organic amine neutralizer, the bactericide, the building sand wall-shaped emulsion, the film-forming aid, the antifreezing agent, the thickener and the rest of deionized water into the mixed solute A obtained in the step (1) under the stirring state, and stirring at the medium speed of 700 revolutions per minute for 25 minutes to obtain a mixture B;

Effects of the embodiment

The performance and environmental index comparative experiments were carried out on the zero water absorption sand wall building coatings obtained by the low temperature film formation of examples 1 to 3, commercial sand wall building coating CS1016 (produced by Jinan Chuan stone decoration engineering Co., Ltd.), commercial sand wall building coating HR208 (produced by Jiangsu Jingheng new materials science and technology Co., Ltd.), and the coatings of comparative example 1 and comparative example 2, and the specific results are shown in tables 6 and 7.

TABLE 6 product Performance index

TABLE 7 environmental protection index

As can be seen from Table 6, the low temperature film-forming zero water absorption sand wall-like architectural coating of the present invention can be applied by spraying or blade coating. The film forming properties of the product of the invention, the product sold in the market and the product of the comparative example are not abnormal in a standard state, but the film forming properties of the product of the invention are normal at 5 ℃ in a low-temperature film forming property, and the product sold in the market and the product of the comparative example are abnormal. It can be seen that the low temperature film forming property of the product of the invention is obviously better than that of the commercial sand wall architectural coatings CS1016 and HR208 and the comparative examples 1 and 2 of the invention. The water absorption capacity (2h) of the product of the invention, the product sold on the market and the product of the comparative example is less than 2.0g, and can meet the technical requirement of the water absorption capacity in JG/T24-2018 synthetic resin emulsion sand wall building coating, but along with the extension of the test time, the water absorption capacity of CS1016 and HR208 of the commercial sand wall building coating and the water absorption capacity of the comparative example 1 and the comparative example 2 of the invention are obviously increased, and when the test time is prolonged and the test time is prolonged to 4h, the water absorption capacity of CS1016 and HR208 of the commercial sand wall building coating is more than 2.0g, and can not meet the technical requirement of the water absorption capacity in JG/T24-2018 synthetic resin emulsion sand wall building coating. The water absorption capacity of comparative example 1 and comparative example 2 is still less than 2.0g, the water absorption capacity of examples 1 to 3 is 0, the technical requirements of the water absorption capacity of JG/T24-2018 synthetic resin emulsion sand wall building coating can be met, and when the inspection time is prolonged to 24 hours, the water absorption capacity of the commercial sand wall building coatings CS1016 and HR208, the water absorption capacity of comparative example 1 and the water absorption capacity of comparative example 2 are more than 2.0g, and the technical requirements of the water absorption capacity of JG/T24-2018 synthetic resin emulsion sand wall building coating can not be met. The water absorption capacity of the products in examples 1 to 3 is 0, and the water absorption capacity can meet the technical requirement of water absorption capacity in JG/T24-2018 synthetic resin emulsion sand wall building coating, which indicates that the water absorption capacity of the products is zero. The product of the invention can meet the requirement of excellent film-forming performance in continuous rainy environment. The drying time, the stain resistance and the artificial weather aging resistance of the product are also obviously better than those of the commercial product and the comparative examples 1 and 2 of the invention. Other performance indexes of the invention can meet and exceed the technical requirements of the currently effective product standard JG/T24-2018 exterior wall type products.

As can be seen from Table 7, the VOC content of the low-temperature film-forming zero-water-absorption sand wall building coating is far lower than that of the commercial sand wall building coatings CS1016 and HR208 and the commercial sand wall building coatings in the comparative examples 1 and 2, free formaldehyde, benzene, toluene and heavy metal substances are not detected, the technical requirements of the HJ 2537-. The Volatile Organic Compound (VOC) content of the commercial sand wall architectural coatings CS1016, HR208 and the comparative examples of the present invention is significantly higher than the low temperature film-forming zero water absorption sand wall architectural coating of the present invention.

In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The description is thus to be regarded as illustrative instead of limiting.

Claims

1. The low-temperature film-forming zero-water-absorption sand wall-shaped building coating is characterized by comprising the following components in percentage by mass: 20.20-26.05% of building coating sand wall-shaped emulsion, 0.18-0.23% of hydroxypropyl methyl cellulose, 0.06-0.08% of organic amine neutralizer, 0.60-0.65% of defoaming agent, 0.30-1.05% of inert water-blocking agent, 0.66-0.72% of antifreezing agent, 1.10-1.36% of film-forming additive, 0.22-0.24% of bactericide, 0.55-0.75% of thickening agent, 60.00-67.00% of 40-80 mesh natural colored sand and 8.0-10.0% of water.

2. The low temperature film forming zero water absorption sand wall architectural coating of claim 1 wherein the architectural coating sand wall emulsion is selected from ENCOR enco DT250, ENCOR 6430 or novalht XG-661 emulsion; the hydroxypropyl methyl cellulose is selected from HPMC produced by Hebei Xingtai cellulose Co; the organic amine neutralizer is selected from a multifunctional additive HT-96 produced by break-Thai chemical industry Limited company in Nantong City; the defoaming agent is NXZ produced by break Thai chemical industry Co., Ltd, Nantong City or SN-NXZ produced in Taiwan; the inert water-blocking agent is selected from YT-908 type water-blocking agent and YT-909 type high-efficiency separation-blocking agent of the Yitai chemical material company Limited; the film-forming assistant is selected from dodecyl alcohol ester produced by Jiangsu Runtai chemical company, Ltd; the bactericide is selected from antiseptic bactericide YN-188 produced by Baoding sunshine auxiliary agent company Limited; the thickening agent is selected from SD-15-P thickening agents produced by Guangzhou Sande chemical industry Co.Ltd; the natural color sand of 40-80 meshes for seeking fox is selected from natural color sand produced by Yongshun mineral product processing factory in Lingshu county, Kogxing mineral product processing factory in Lingshu county in Hebei province, and Shijiazhuangxiang Liang natural color sand factory.

3. The low-temperature film-forming zero-water-absorption sandy-walled architectural coating of claim 1, wherein the preparation method comprises the steps of:

(1) stirring the hydroxypropyl methyl cellulose, 50.0-80.0% of deionized water, 30.0-50.0% of organic amine neutralizer and 30.0-50.0% of defoaming agent at a high speed to obtain a mixed solution A;

(2) adding the rest of organic amine neutralizer, the bactericide, the building sand wall-shaped emulsion, the film-forming assistant, the antifreezing agent, the inert water-blocking agent, the thickener and the rest of deionized water into the mixed solute A obtained in the step (1) under the stirring state, and stirring at medium speed to obtain a mixture B;

(3) and (3) sequentially adding 40-80 meshes of natural colored sand and the rest of the defoaming agent into the mixture B obtained in the step (2) under the stirring state, and stirring at a low speed to obtain the low-temperature film-forming zero-water-absorption building sand wall-shaped building coating.

4. The preparation method according to claim 3, characterized in that the step (1) is carried out with high-speed stirring, the stirring speed is 1200-1500 rpm, and the stirring time is 5-15 minutes;

stirring at a medium speed in the step (2), wherein the stirring speed is 800-1100 rpm, and the stirring time is 5-15 minutes;

and (4) stirring at a low speed in the step (3), wherein the stirring speed is 500-700 rpm, and the stirring time is 5-15 minutes.