CN105086723A - fireproof coating for buildings - Google Patents

Abstract

The invention provides a novel building fireproof coating composition, which is characterized in that: the coating composition comprises acrylate-styrene-vinyl acetate terpolymer, self-emulsifying epoxy resin, red phosphorus, aluminum tripolyphosphate, melamine, expandable graphite, glycerol, alkylphenol polyoxyethylene sulfonate, hydrated iron oxide, metatitanic acid and Na₂O·nSiO₂·mH₂O and water. Wherein, the self-emulsifying epoxy resin comprises 20-30 parts of self-emulsifying epoxy resin, 5-10 parts of red phosphorus, 15-25 parts of aluminum tripolyphosphate, 20-30 parts of melamine, 5-10 parts of expandable graphite, 15-25 parts of glycerol, 5-15 parts of alkylphenol polyoxyethylene sulfonate, 5-10 parts of hydrated iron oxide, 5-10 parts of metatitanic acid, and Na by weight based on 100 parts of solid of acrylate-styrene-vinyl acetate terpolymer₂O·nSiO₂·mH₂O10-20 parts, and water 100-120 parts. The building fireproof coating has excellent comprehensive performance through unique component selection and optimal component proportion, and has excellent overall performances of fire resistance, waterproofness, weather resistance, attractiveness and the like.

Description

fireproof coating for buildings

technical field

The invention relates to the technical field of buildings, in particular to a fireproof coating composition for buildings.

Background technique

In recent years, with the rapid development of my country's national economy, the construction industry, as a pillar industry of the national economy, has naturally grown by leaps and bounds, and the related energy consumption of buildings has also become extremely large. The energy directly consumed in the process of construction and use accounts for the total energy of the whole society. 30% of consumption. With the country's increasing emphasis on energy conservation, emission reduction and sustainable development, various types of heat insulation coatings and insulation coatings have emerged in the construction industry and other related industries, such as polystyrene boards and rubber powder polystyrene particles, polyurethane foam Although thermal insulation systems such as thermal insulation systems can achieve thermal insulation, the products have disadvantages such as complex construction, poor waterproof performance, and no fire prevention. Fire performance expectations.

Architectural fire retardant coatings are mainly used for coating on the surface of buildings. When a fire occurs, the coating film itself is flammable or non-combustible. It has a good protective effect on the substrate and wins valuable time for fire extinguishing and personnel evacuation. Therefore, research on it And applications are becoming more and more hot spots in the field of construction. The research on fire-resistant and flame-retardant coatings in my country started late. At present, there are two main types of fire-resistant coatings. One is to use flame-retardant organic polymers as base materials, and the other is to add flame retardants to coatings. The representative halogen Phosphorus-based and phosphorus-based fire retardant coatings are in continuous development, but some bromine-based fire-resistant coatings in the halogen system have been controversial due to environmental protection issues. Although inorganic fireproof coatings can withstand high-temperature baking, they have defects such as poor adhesion, low strength, and brittle coating films. In addition to the above-mentioned performances such as fire resistance, architectural fire retardant coatings also require ease of construction, because the shape of buildings is often very complex, and it is difficult to apply in advance where the structural components are combined, and it must be applied on site. The fire retardant coating must have considerable ease of construction, or as little coating as possible to reduce construction time or frequency. At the same time, with people's continuous pursuit of improving the quality of life, people are paying more and more attention to the aesthetics of buildings. This requires building fireproof coatings to maintain the appearance of buildings as much as possible while meeting the requirements of fire prevention and easy construction.

Although the widely studied acrylic water-based fireproof coating has advantages such as environmental protection, it is still difficult to meet the increasing requirements of building fireproof coatings in terms of fire resistance, water resistance, weather resistance, and aesthetics. It is urgent to develop a new type of fireproof coating. Construction is convenient, and has excellent fire resistance, water resistance, weather resistance, aesthetics and other outstanding architectural fireproof coatings. The object of the present invention is to provide a novel building fireproof coating with excellent comprehensive performance.

Contents of the invention

The object of the present invention is to provide a new type of building fireproof coating composition with excellent comprehensive performance, which makes the building fireproof coating have excellent fire resistance, water resistance, Weather resistance, aesthetics, etc.

To achieve the above object, the present invention adopts the following technical solutions:

A novel building fireproof coating composition is characterized in that: said coating composition comprises acrylate-styrene-vinyl acetate terpolymer, self-emulsifying epoxy resin, red phosphorus, aluminum tripolyphosphate, melamine, expansibility Graphite, glycerol, alkylphenol polyoxyethylene sulfonate, hydrated iron oxide, metatitanic acid, Na ₂ O·nSiO ₂ ·mH ₂ O and water.

Among them, based on 100 parts by weight of solid content of acrylate-styrene-vinyl acetate terpolymer, 20-30 parts of self-emulsifying epoxy resin, 5-10 parts of red phosphorus, 15-25 parts of aluminum tripolyphosphate, melamine 20-30 parts, 5-10 parts of expandable graphite, 15-25 parts of glycerin, 5-15 parts of alkylphenol polyoxyethylene sulfonate, 5-10 parts of hydrated iron oxide, 5-10 parts of metatitanic acid parts, Na ₂ O·nSiO ₂ ·mH ₂ O 10-20 parts, water 100-120 parts.

As preferably, in the acrylate-styrene-vinyl acetate terpolymer, by weight percentage, acrylate accounts for 70-80%, styrene accounts for 5-15%, and vinyl acetate accounts for 10-20%. The weight average molecular weight of the compound is about 60000-80000, and has a hydroxyl value of 1-10mgKOH/g.

Further preferably, the average particle diameter of the acrylate-styrene-vinyl acetate terpolymer is 0.5-1 μm.

Preferably, the self-emulsifying epoxy resin is a BPA type epoxy resin with an epoxy resin equivalent of 200-500.

Preferably, the average particle size of the expandable graphite is 20-40 μm.

Preferably, the number average molecular weight of the alkylphenol polyoxyethylene sulfonate is about 1000-5000.

Preferably, the average particle size of the hydrated iron oxide and metatitanic acid is 0.25-0.5 μm.

Preferably, n=1.8-2.2 in Na ₂ O·nSiO ₂ ·mH ₂ O.

The preparation method of the coating composition is as follows: acrylate-styrene-vinyl acetate terpolymer, self-emulsifying epoxy resin, red phosphorus, aluminum tripolyphosphate, melamine, expandable graphite, glycerol, alkyl Phenol polyoxyethylene sulfonate, hydrated iron oxide, metatitanic acid, Na ₂ O nSiO ₂ mH ₂ O raw materials are added to deionized water at 35-40°C according to the proportion, and after fully stirring for 3-5 hours, Obtain the product of the present invention.

The beneficial effect of the method of the present invention is: the building fireproof coating is endowed with excellent comprehensive performance through unique component selection and preferred component distribution ratio, and it has excellent overall performance such as fire resistance, water resistance, weather resistance and aesthetics.

Detailed ways

Example 1

Based on 100 parts by weight of solid content of acrylate-styrene-vinyl acetate terpolymer, 20 parts of self-emulsifying epoxy resin, 5 parts of red phosphorus, 15 parts of aluminum tripolyphosphate, 20 parts of melamine, and 5 parts of expandable graphite , 15 parts of glycerol, 5 parts of alkylphenol polyoxyethylene sulfonate, 5 parts of hydrated iron oxide, 5 parts of metatitanic acid, and 10 parts of Na ₂ O·nSiO ₂ ·mH ₂ O. The good raw materials were sequentially added to 100 parts of deionized water at 38° C. and stirred thoroughly for 4 hours to obtain the product of Example 1 of the present invention.

Among them, in the acrylate-styrene-vinyl acetate terpolymer, by weight percentage, acrylate accounts for 75%, styrene accounts for 10%, and vinyl acetate accounts for 15%. The weight average molecular weight of the copolymer is about 70000, and has The hydroxyl value of 5mgKOH/g, the average particle size is 0.7μm. The self-emulsifying epoxy resin is a BPA type epoxy resin with an epoxy resin equivalent of 300. The average particle size of the expandable graphite was 30 μm. The number average molecular weight of the alkylphenol polyoxyethylene sulfonate is about 1000-5000. The average particle size of hydrated iron oxide and metatitanic acid is 0.25 μm. In Na ₂ O·nSiO ₂ ·mH ₂ O, n=2.0.

The contents of each component were adjusted in Examples 2-9, and the specific content ratios are listed in Table 1.

The above-mentioned fireproof coating composition is coated on the steel plate surface with a thickness of 5mm, and the thickness of each coating film is 1mm, and the interval time between each coating film is 4 hours. After coating the film 3 times, it is naturally dried for 48 hours at room temperature to obtain the test material Used to test the performance of coating compositions.

The test condition for the uniformity and density in Table 1 is to count the number of pores (pcs/cm ² ) within the range of 1 cm ² of the coating film under the condition of 10 times microscope.

The test conditions for flame retardancy in Table 1 are heating using the JISA1304 standard heating curve, monitoring the temperature inside the steel plate with a K thermocouple, and evaluating the fire resistance by the time (min) for the inner surface of the steel to reach 500°C and the shedding of the foam Flame retardant properties, specific evaluation methods for the degree of shedding are as follows, based on visual inspection, ○: no shedding at all; Δ: less than 20% of shedding; ×: more than 20% of shedding.

The water resistance test conditions in Table 1 are: after immersing the test material in water at room temperature for 3 days, visually observe the surface state of the coating film, specifically, ○: the area of bubbles or peeling on the surface of the coating film is less than 10%; Δ: The area of bubbles or peeling on the surface of the coating film is 10-30%; ×: the area of bubbles or peeling on the surface of the coating film exceeds 30%.

Further description is given below for the fire retardant coating system formula of the present invention:

The acrylate-styrene-vinyl acetate terpolymer in the paint of the invention is an environmentally friendly water-based resin with excellent flame retardancy, and is used as the main component of the paint of the invention. Among them, acrylate is the main component, and its combination with styrene can play a good role in dispersing and stabilizing red phosphorus, aluminum tripolyphosphate and other components, as well as improving the compactness, strength and water resistance of the coating film. To exert the above-mentioned effects, its content in the copolymer should be at least 5%, but if the content is too high, it is not conducive to continuously improving its effect, but will reduce the film-forming workability, so its content is controlled to be less than 15%. The combination of vinyl acetate and acrylate can greatly improve the workability, and can greatly reduce the occurrence of cracks in the drying process. In order to exert the above effects, it should be at least 10%, but if the content is too high, it will affect other components. Effect, thereby affecting the strength, compactness, etc. of the coating film, so it is controlled to be less than 20%. In addition, when the weight average molecular weight of the copolymer is about 60000-80000 and the hydroxyl value is 1-10 mgKOH/g, the best fire resistance, weather resistance, water resistance, etc. can be obtained, because if the weight average molecular weight is too small, it may cause Its dispersibility to each component in the system becomes worse, thereby affecting the stability of the system and the performance of weather resistance and anticorrosion, and if it is too large, the high temperature resistance performance will deteriorate, but the weather resistance and fire resistance will be reduced, and the hydroxyl value will also significantly affect To the stability and weather resistance of the system, and it will also have a significant effect of foaming and carbonization. In addition, the average particle size of the acrylate-styrene-vinyl acetate terpolymer is preferably 0.5-1 μm to ensure ease of construction and coating quality.

The self-emulsifying epoxy resin in the coating of the present invention is very important for the coating film performance of the coating, and its addition can significantly improve the adhesion and compactness of the coating film, thereby improving the fire resistance, weather resistance, waterproof and other properties of the coating film. For the exfoliation of the foamed carbonized layer after heating, in order to exert the above-mentioned effects, its addition amount should be at least 20 parts. However, excessive addition has no additional effect, but will affect the effects of other components, so it should be controlled below 30 parts. In addition, in order to make the self-emulsifying epoxy resin better compatible with the components in the system, a BPA type epoxy resin with an epoxy resin equivalent of 200-500 is selected.

Red phosphorus and aluminum tripolyphosphate in the coating of the present invention, red phosphorus has very excellent flame-retardant effect, in order to exert its excellent effect, its content is preferably more than 5 parts, but its content is too high and can cause coating Therefore, it is best to control its content below 10 parts; aluminum tripolyphosphate can not only play a flame-retardant effect synergistically with red phosphorus, but also can significantly improve the anti-corrosion performance of the coating system. Add at least 15 parts or more, but too high addition may lead to problems such as poor applicability and water resistance of the paint, so it is controlled to be less than 25 parts.

In the coating of the present invention, melamine is a typical blowing agent, and it has a good barrier effect, which can prevent the moisture absorption of materials such as red phosphorus flame retardants well, thereby improving the waterproofness of the coating, and it is useful for improving the coating film. Transparency is also helpful, but its content should not be too high, otherwise it will affect the overall effect of the coating such as flame retardancy, so control its content at 20-30 parts.

The expandable graphite in this coating can greatly increase the expansion ratio of the system and thus improve the fire and flame retardant performance. However, its excessive addition will affect the overall performance of the coating film, such as coatability and transparency. Therefore, its content is controlled at 5- 10 servings. At the same time, in order to ensure the performance of the expandable graphite, its average particle size is controlled at 20-40 μm.

Glycerol in the coating of the present invention can well assist the flame retardant performance of acrylate, in order to make it synergistically flame retardant with acrylate, its addition should be at least 15 parts, but too much addition can not improve the system Flame retardant properties, on the contrary, will lead to poor coatability of the paint, so the content is controlled below 25 parts.

Table 1

1 2 3 4 5 6 7 _{8 9} Terpolymer 100 100 100 100 100 100 100 100 100 epoxy resin 20 25 30 15 twenty three 25 twenty two 25 twenty two Red phosphorus 5 7 10 8 7 15 7 9 8 Aluminum Tripolyphosphate 15 20 25 twenty two twenty three 27 13 twenty three 20 Melamine 20 25 30 26 15 twenty two twenty four twenty three twenty four Expandable graphite 5 8 10 7 8 7 7 6 7 Glycerol 15 20 25 20 twenty two 20 18 16 twenty two Sulfonate 5 1O 15 12 11 15 3 10 10 Hydrated iron oxide 5 7 10 8 7 7 5 - 5 Metatitanic acid 5 7 10 8 8 7 5 10 2 water glass 10 15 20 14 15 15 10 20 5 water 100 110 120 120 110 120 120 110 100 Number of stomata 5 2 7 12 7 16 15 4 5 500°C time 30 35 37 32 25 33 27 twenty four 26 The foam layer falls off Δ ○ ○ Δ x Δ x ○ x waterproof ○ ○ Δ Δ Δ x x Δ ○

The alkylphenol polyoxyethylene sulfonate in the coating of the present invention can play the effect of uniform dispersion, and it can play a good stabilizing effect in conjunction with the system of the present invention, thereby facilitating the storage and transportation of the coating. In order to bring into play the above-mentioned effects, it should be at least Add 5 parts, but too high addition has no continuous effect on improving performance but affects the effects of other ingredients, so it is controlled to be less than 15 parts. In addition, the number-average molecular weight is about 1000-5000, and if it is too small, a sufficient dispersion stabilization effect cannot be exerted, and if it is too large, water resistance and the like will be reduced.

Hydrated iron oxide, metatitanic acid, and Na ₂ O·nSiO ₂ ·mH ₂ O in the coating of the present invention are used as flame-retardant fillers, all of which have very good heat-resistant and flame-retardant properties, especially the three filler components can There is a gradual loss of crystal water in the middle, so as to further improve the heat resistance and flame retardancy of the coating system. The three fillers together have an obvious synergistic effect on improving the flame retardancy. At the same time, metatitanic acid and Na ₂ O·nSiO ₂ ·mH ₂ O can to a large extent, like self-emulsified epoxy resin, play a role in stabilizing the foaming layer during heating and avoiding its peeling and splitting, thereby further improving the flame retardancy. Performance, in order to exert the above-mentioned effects, at least 5 parts of hydrated iron oxide, 5 parts of metatitanic acid, and 10 parts of Na ₂ O·nSiO ₂ ·mH ₂ O. However, considering the problems of transparency and coatability, the maximum content of the three is 10 parts of hydrated iron oxide, 10 parts of metatitanic acid, and 20 parts of Na ₂ O·nSiO ₂ ·mH ₂ O. In addition, in order to ensure the toughness, transparency and aesthetics of the coating film, the average particle size of hydrated iron oxide and metatitanic acid should be controlled at 0.25-0.5 μm. In addition, the value of n in Na ₂ O·nSiO ₂ ·mH ₂ O is preferably between 1.8 and 2.2. If the value of n is too small, it is difficult to exert the heat-resistant and flame-retardant properties. However, if the value of n is too large, it will make Na ₂ O _The solubility of nSiO2 becomes poor, which affects the coating performance of the coating.

Although the present invention illustrates the coating effect of the present invention through the above examples, the present invention is not limited to the above examples. Those skilled in the art should understand that any improvement of the present invention, the equivalent replacement of each raw material of the product of the present invention, the addition of auxiliary components, the selection of specific methods, etc., all fall within the scope of protection and disclosure of the present invention.

Claims (7)

1. A novel building fireproof coating composition is characterized in that: said coating composition comprises acrylate-styrene-vinyl acetate terpolymer, self-emulsifying epoxy resin, red phosphorus, aluminum tripolyphosphate, melamine, Expandable graphite, glycerol, alkylphenol polyoxyethylene sulfonate, hydrated iron oxide, metatitanic acid, Na ₂ O·nSiO ₂ ·mH ₂ O and water. Among them, based on 100 parts by weight of solid content of acrylate-styrene-vinyl acetate terpolymer, 20-30 parts of self-emulsifying epoxy resin, 5-10 parts of red phosphorus, 15-25 parts of aluminum tripolyphosphate, melamine 20-30 parts, 5-10 parts of expandable graphite, 15-25 parts of glycerin, 5-15 parts of alkylphenol polyoxyethylene sulfonate, 5-10 parts of hydrated iron oxide, 5-10 parts of metatitanic acid parts, Na ₂ O·nSiO ₂ ·mH ₂ O 10-20 parts, water 100-120 parts. 2. coating composition according to claim 1 is characterized in that: as preferably, in described acrylate-styrene-vinyl acetate terpolymer, by weight percentage, acrylate accounts for 70-80%, Styrene accounts for 5-15%, vinyl acetate accounts for 10-20%, the weight average molecular weight of the copolymer is about 60000-80000, and has a hydroxyl value of 1-10mgKOH/g. Further preferably, the average particle diameter of the acrylate-styrene-vinyl acetate terpolymer is 0.5-1 μm. 3. The coating composition according to claim 1, characterized in that: preferably, the self-emulsifying epoxy resin is a BPA type epoxy resin with an epoxy resin equivalent of 200-500. 4. The coating composition according to claim 1, characterized in that: preferably, the average particle diameter of the expandable graphite is 20-40 μm. 5. The coating composition according to claim 1, characterized in that: preferably, the number average molecular weight of the alkylphenol polyoxyethylene sulfonate is about 1000-5000. 6. The coating composition according to claim 1, characterized in that: preferably, the average particle size of hydrated iron oxide and metatitanic acid is 0.25-0.5 μm. 7. The coating composition according to claim 1, characterized in that: preferably, n=1.8-2.2 in Na ₂ O·nSiO ₂ ·mH ₂ O.