Environment-friendly scratch-resistant flame retardant for coating and preparation method thereof

Abstract

The invention discloses an environment-friendly scratch-resistant flame retardant for a coating and a preparation method of the environment-friendly scratch-resistant flame retardant. The environment-friendly scratch-resistant flame retardant for the coating is prepared from the following raw materials in parts by mass: 1-10 parts of an inorganic phosphorus flame retardant, 1-20 parts of a metal hydroxide flame retardant, 1-10 parts of a borate flame retardant and 1-10 parts of a functional filler. The functional filler in the raw materials comprises at least one of aluminum oxide, silicon carbide and boron nitride; the inorganic phosphorus flame retardant in the raw materials comprises at least one of ammonium polyphosphate, aluminum hypophosphite, magnesium hypophosphite and calcium hypophosphite; the metal hydroxide flame retardant in the raw materials comprises at least one of magnesium hydroxide and aluminum hydroxide; the borate flame retardant in the raw materials comprises at least one of zinc borate, barium metaborate and ammonium borate. According to the environment-friendly scratch-resistant flame retardant for the coating and the preparation method of the environment-friendly scratch-resistant flame retardant, the flame retardance, the scratch resistance and the environmental friendliness of the flame retardant can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of flame retardant materials and relates to a flame retardant, in particular to an environmentally friendly scratch-resistant flame retardant for coatings and a preparation method thereof. Background Art

[0002] Coatings are a type of liquid or solid material applied to the surface of products to protect, decorate or give products special functions. Due to the different special functions they give to products, coatings can be divided into: decorative coatings, anti-corrosion coatings, scratch-resistant coatings, flame-retardant coatings, waterproof coatings, high-temperature resistant coatings, etc. The special functions of coatings are mainly achieved through the film-forming substances and functional additives therein. Commonly used functional additives include stabilizers, toughening agents, antioxidants, antistatic agents, conductive agents, flame retardants, etc. However, in the prior art, some flame-retardant coatings use halogens and antimony compounds as flame retardants. Halogens and antimony-containing flame retardants are environmentally harmful substances that will cause serious pollution to the environment. In addition, in the prior art solutions, the flame retardant properties of the coatings modified with flame retardants are poor. At the same time, in order to improve the flame retardancy of the coatings, when the amount of flame retardant added is too much, the scratch resistance of the coatings decreases significantly. In some application fields, such as flooring, wall panels and other board fields, the scratch resistance of the board is extremely important and is the basic standard for judging the use value of the board. If the scratch resistance of the coating is poor, the prepared board will have a short life and low use value, which means that the coating has poor usability. At the same time, the application process of the coating is not mature:

[0003] For example, Chinese invention patent CN118325401A discloses a bio-based flame retardant coating, coating and preparation method, the base resin used is brominated styrene butadiene rubber resin, antimony compounds are used in the flame retardant, and finally a bromine-antimony-containing bio-based flame retardant coating is prepared. The prior art with publication number CN118308004A discloses a fire retardant coating containing phosphorus-chlorine flame retardant, which prepares a phosphorus-chlorine flame retardant through independent synthesis and applies it to the coating. The prior art with publication number CN116463016A discloses a heat-resistant UV flame retardant coating, which has flame retardancy by adding aromatic bromine propylene monomer and antimony trioxide. The prior art with publication number CN114806311A discloses a water-based low-smoke fire retardant coating and its preparation method, which makes the coating fireproof and flame retardant by adding brominated bisphenol A epoxy resin and chlorinated paraffin. In the above patents, the coatings or flame retardants constituting the coatings contain halogens or antimony compounds, both of which have been listed as environmentally harmful substances that will cause serious damage to the environment.

[0004] Chinese invention patent CN103849275A discloses a method for preparing a flame-retardant coating, in which the flame retardant used is mainly natural ore. In the above patent, the flame retardant used in the coating is a single type of flame retardant. It is generally believed that the flame retardant performance of the coating prepared using a single type of flame retardant is poor. When the amount of flame retardant is too much, the flame retardant is difficult to disperse evenly in the coating, resulting in agglomeration and precipitation on the surface of the material, resulting in the coating having no scratch resistance and adhesion, thereby reducing the usability of the coating.

[0005] In the above patents, no requirements or specific descriptions and characterizations are made for the scratch resistance of the coating. However, excessive addition of flame retardants will reduce the scratch resistance of the coating to varying degrees, which will seriously affect the usability of the coating and even make the coating worthless. Therefore, it is necessary to evaluate the scratch resistance of the coating. The scratch resistance of the coating has become an important indicator for evaluating the usability and performance of the coating in many fields such as sheet materials, film materials, and coated cloth. Considering today's environmental protection requirements and future environmental protection trends, the coating should be a halogen-free and antimony-free system, in which the flame retardant should be an environmentally friendly flame retardant; considering the dispersion of the flame retardant in the coating and the usability of the coating, the flame retardant should be compounded with multiple and appropriate flame retardants, rather than a single and excessive flame retardant. Therefore, the selection of a variety of environmentally friendly flame retardants for compounding can enable the coating to have both high flame retardancy and scratch resistance while meeting environmental protection requirements, thus having a certain use value.

[0006] In view of this, there is an urgent need to design a new flame retardant to overcome at least part of the above-mentioned defects of existing flame retardants. Summary of the invention

[0007] The invention provides an environmentally friendly scratch-resistant flame retardant for coatings and a preparation method thereof, which can improve the flame retardancy, scratch resistance and environmental protection of the flame retardant.

[0008] To solve the above technical problem, according to one aspect of the present invention, the following technical solution is adopted:

[0009] An environmentally friendly scratch-resistant flame retardant for coatings is prepared from raw materials containing the following parts by mass: 1 to 10 parts of inorganic phosphorus flame retardants, 1 to 20 parts of metal hydroxide flame retardants, 1 to 10 parts of borate flame retardants, and 1 to 10 parts of functional fillers.

[0010] As an embodiment of the present invention, the functional filler in the raw material includes at least one of aluminum oxide, silicon carbide and boron nitride.

[0011] As an embodiment of the present invention, the aluminum oxide structure in the functional filler is spherical, and the boron nitride structure is flaky.

[0012] As an embodiment of the present invention, the inorganic phosphorus flame retardant in the raw material includes at least one of ammonium polyphosphate, aluminum hypophosphite, magnesium hypophosphite, and calcium hypophosphite;

[0013] The metal hydroxide flame retardant in the raw material includes at least one of magnesium hydroxide and aluminum hydroxide;

[0014] The borate flame retardant in the raw material includes at least one of zinc borate, barium metaborate and ammonium borate.

[0015] As an embodiment of the present invention, the inorganic phosphorus flame retardant in the raw material includes ammonium polyphosphate and aluminum hypophosphite; the addition ratio of ammonium polyphosphate to hypophosphite in the inorganic phosphorus flame retardant is 1:1;

[0016] The metal hydroxide flame retardant in the raw materials includes magnesium hydroxide and aluminum hydroxide; the addition ratio of magnesium hydroxide to aluminum hydroxide in the metal hydroxide flame retardant is 1:1.

[0017] As an embodiment of the present invention, the added mass ratio of the inorganic phosphorus flame retardant, the metal hydroxide flame retardant, the borate flame retardant and the functional filler in the raw material is 1:2:1:1.

[0018] A method for preparing an environmentally friendly scratch-resistant flame retardant for coatings, the preparation method comprising:

[0019] Step S1, adding inorganic phosphorus flame retardants, metal hydroxide flame retardants, borate flame retardants, and other functional fillers into a diluent and stirring for a set time to obtain a flame retardant slurry.

[0020] Step S2: adding the flame retardant slurry into the non-flame retardant coating and stirring again, measuring the viscosity of the coating, and stopping stirring after reaching a suitable viscosity.

[0021] Step S3: The modified coating is applied twice, namely, primer coating and top coating. By controlling the amount of coating used in the two coatings, uniform coating of the coating is ensured and excellent product performance is achieved.

[0022] As an embodiment of the present invention, in step S1, the speed of the stirrer is 1000-3000 r / min, and the stirring time reaches 5-15 min, and then the stirring is stopped.

[0023] As an embodiment of the present invention, in step S2, the rotation speed of the stirrer is 1000-3000 r / min, and the suitable viscosity range is 500-2000 cp.

[0024] As an embodiment of the present invention, in step S3, the primer coating amount is controlled at 20 to 30 g / m 2, the top coating amount is controlled at 10~20g / m 2 The total coating amount is controlled at 30-50g / m 2 .

[0025] The beneficial effects of the present invention are as follows: the environmentally friendly scratch-resistant flame retardant for coatings and the preparation method thereof proposed in the present invention can improve the flame retardancy, scratch resistance and environmental protection of the flame retardant.

[0026] The present invention conducts a critical radiation heat flux test on the coated modified product to characterize the flame retardant properties of the coating, and further provides feedback on the flame retardant properties of the flame retardant for the coating; the present invention conducts scratch resistance, scratch resistance (Martindale), and adhesion performance tests on the coated modified product to characterize the physical properties and usability of the coating, and further provides feedback on the usability of the flame retardant.

[0027] It can be seen from the above technical solutions that compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention uses an environmentally friendly scratch-resistant compound flame retardant, and the prepared coating is further coated on related products to prepare test samples. The critical radiant heat flux of the samples prepared using the environmentally friendly scratch-resistant compound flame retardant is greater than 6.5kw / m2, while the critical radiant heat flux of the samples prepared without flame retardant is only 4.22kw / m2; the scratch resistance of the samples prepared using the environmentally friendly scratch-resistant compound flame retardant can reach more than 5N, while the scratch resistance of the samples prepared with a single excess flame retardant is only 2N; in the scratch resistance test under 38N load test conditions, the Martindale test grade of the samples prepared using the environmentally friendly scratch-resistant compound flame retardant is ≤2, while the Martindale test grade of the samples prepared with a single excess flame retardant is only 4. After the adhesion test under the same conditions, the samples prepared using the environmentally friendly scratch-resistant compound flame retardant did not fall off / peel off, while the samples prepared with a single excess flame retardant fell off and peeled off. It can be seen that the coating prepared by using the environmentally friendly scratch-resistant flame retardant for coatings provided by the present invention has significantly improved flame retardant properties, and slightly improved scratch resistance and abrasion resistance compared to non-flame retardant coatings without adding flame retardants; compared to flame retardant coatings prepared by using a single excessive flame retardant, the scratch resistance, abrasion resistance, and adhesion properties are significantly improved, and the flame retardant properties are slightly improved. Therefore, the preparation method of an environmentally friendly scratch-resistant flame retardant for coatings provided by the present invention and its application have significant beneficial effects.

[0029] The present invention removes environmentally harmful flame retardants such as halogen and antimony-containing flame retardants in existing flame retardants, and the flame retardant of the present invention is environmentally friendly; at the same time, the present invention adds functional fillers such as silicon carbide and aluminum oxide, which can effectively increase the scratch resistance of the flame retardant after application; in addition, aluminum oxide and boron nitride can form a heat conduction path, effectively promote the transfer and release of heat, and increase flame retardancy. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 FIG. 4 is a diagram showing the thermal conductivity mechanism of aluminum oxide and boron nitride in one embodiment of the present invention.

[0031] Figure 2 The present invention is a flowchart of a method for preparing an environmentally friendly scratch-resistant flame retardant for coatings in one embodiment of the present invention. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0033] In order to further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0034] The description in this section is only for several typical embodiments, and the present invention is not limited to the scope of the embodiments. The same or similar prior art means and some technical features in the embodiments are mutually replaced within the scope of the present invention.

[0035] Unless otherwise indicated, implied from the context, or customary in the prior art, all parts and percentages in this application are based on weight, and the test and characterization methods used are all current as of the filing date of this application. Where applicable, the contents of any patent, patent application or publication referred to in this application are fully incorporated herein by reference, and their equivalent patent families are also incorporated by reference, especially the definitions of synthesis techniques, product and processing designs, polymers, comonomers, initiators or catalysts disclosed in these documents in the art. If the definition of a specific term disclosed in the prior art is inconsistent with any definition provided in this application, the definition of the term provided in this application shall prevail.

[0036] Numerical ranges in this application are approximate values, so unless otherwise specified, they may include numerical values ​​outside the range. Numerical ranges include all numerical values ​​from the lower limit to the upper limit increased by 1 unit, provided that there is an interval of at least 2 units between any lower value and any higher value. For example, if the recorded component, physical or other properties (such as molecular weight, melt index, etc.) are 100 to 1000, it means that all single values ​​are clearly listed, such as 100, 101, 102, etc., and all sub-ranges, such as 100 to 166, 155 to 170, 198 to 200, etc. For a range containing a numerical value less than 1 or containing a fraction greater than 1 (such as 1.1, 1.5, etc.), 1 unit is appropriately regarded as 0.0001, 0.001, 0.01 or 0.1. For a range containing a single digit less than 10 (such as 1 to 5), 1 unit is usually regarded as 0.1. These are only specific examples of what is intended to be expressed, and all possible combinations of values ​​between the lowest and highest values ​​listed are considered to be clearly recorded in this application. It should also be noted that the terms "first", "second", etc. in this article do not limit the order of precedence, but are only used to distinguish substances with different structures.

[0037] When used with respect to chemical compounds, unless expressly specified otherwise, the singular includes all isomeric forms and vice versa (e.g., "hexane" includes all isomers of hexane, individually or collectively). In addition, nouns using "a," "an," or "the" also include their plural forms unless expressly specified otherwise.

[0038] The terms "comprising", "including", "having" and their derivatives do not exclude the presence of any other components, steps or processes, and are irrelevant to whether these other components, steps or processes are disclosed in this application. To eliminate any doubt, unless explicitly stated, all compositions using the terms "comprising", "including", or "having" in this application may include any additional additives, adjuvants or compounds. On the contrary, except for those necessary for operating performance, the term "essentially consisting of..." excludes any other components, steps or processes from the scope of any description of the term below. The term "consisting of..." does not include any components, steps or processes that are not specifically described or listed. Unless explicitly stated, the term "or" refers to the listed individual members or any combination thereof.

[0039] The description of the steps in each embodiment in the specification is only for the convenience of explanation, and the implementation method of the present application is not limited by the order of implementation of the steps.

[0040] The invention discloses an environmentally friendly scratch-resistant flame retardant for coatings, wherein the environmentally friendly scratch-resistant flame retardant for coatings is prepared from raw materials comprising the following parts by mass: 1 to 10 parts of inorganic phosphorus flame retardants, 1 to 20 parts of metal hydroxide flame retardants, 1 to 10 parts of borate flame retardants, and 1 to 10 parts of functional fillers.

[0041] In one embodiment of the present invention, the functional filler in the raw material includes at least one of aluminum oxide, silicon carbide, and boron nitride. The structure of aluminum oxide is limited to spherical, and the structure of boron nitride is limited to flake. The present invention constructs a composite flame retardant system by adding aluminum oxide, silicon carbide, and boron nitride, so that the flame retardant has functional characteristics such as high temperature resistance and wear resistance, and can also timely remove heat from the system during the combustion process, thereby inhibiting combustion. Among the above compounds, silicon carbide has the characteristics of high temperature resistance and wear resistance. When applied to the coating system, it can effectively improve the wear resistance, high temperature resistance, scratch resistance and other characteristics of the coating. Aluminum oxide also has wear resistance and certain thermal conductivity. However, if it is only single aluminum oxide, in order to produce a better thermal conductivity effect and build a more complete thermal conductivity path, a large amount of aluminum oxide needs to be added, which will affect other properties of the coating. Therefore, boron nitride is introduced into the system. The spherical aluminum oxide small molecules can enter the molecular gaps of the flaky boron nitride. The two together form a good thermal conductivity path, which can improve the wear resistance of the flame retardant while making the flame retardant have better thermal conductivity. During the combustion process, the heat is promptly discharged, thereby inhibiting combustion. The thermal conductivity mechanism of the above aluminum oxide and boron nitride can be seen Figure 1 .

[0042] The inorganic phosphorus flame retardant in the raw material includes at least one of ammonium polyphosphate, aluminum hypophosphite, magnesium hypophosphite, and calcium hypophosphite. The present invention constructs a composite flame retardant system by adding phosphate flame retardants, so that the flame retardant has high flame retardancy. Phosphates decompose to produce phosphoric acid when heated. Phosphoric acid has dehydration properties and can dehydrate the polymer surface to promote carbonization; at the same time, volatile small molecule phosphorus compounds or phosphorus free radicals are also produced to capture hydrogen free radicals or hydroxyl free radicals produced in the flame zone to reduce their concentration. The non-volatile phosphorus compounds produced can cover the polymer surface to form an insulating layer, isolate the air, and prevent combustion.

[0043] The metal hydroxide flame retardant in the raw materials includes at least one of magnesium hydroxide and aluminum hydroxide; the present invention constructs a composite flame retardant system by adding metal hydroxide flame retardants, so that the flame retardant has high flame retardancy. Metal hydroxides can chemically react with hot gases and free radicals in the combustion products, thereby reducing heat release during the combustion process. At high temperatures, metal hydroxides will decompose to produce water and metal oxides. The produced water can absorb a large amount of heat, thereby reducing the surface temperature of the polymer and slowing down the combustion process; the produced metal oxides can chemically react with the hot gases produced by combustion to reduce smoke and heat release. Metal hydroxides can form a pore structure during the combustion process. This pore structure can effectively block heat and oxygen, reduce the temperature of the combustion reaction, and hinder the spread of hot gases and smoke, thereby inhibiting the combustion process.

[0044] The borate flame retardant in the raw material includes at least one of zinc borate, barium metaborate and ammonium borate. The present invention constructs a composite flame retardant system by adding borate flame retardants, so that the flame retardant has high flame retardancy. Borates decompose and produce water at high temperatures, thereby absorbing heat and reducing the surface temperature of the polymer. At the same time, the borate melts to form a glassy covering layer, which seals the surface of the burning object and acts as an insulator. Borates also have a good carbon-promoting effect, which can effectively promote the formation of a carbon layer on the surface of the material, thereby inhibiting combustion.

[0045] In one embodiment of the present invention, the inorganic phosphorus flame retardant in the raw materials includes ammonium polyphosphate and aluminum hypophosphite; the addition ratio of ammonium polyphosphate to hypophosphite in the inorganic phosphorus flame retardant is 1:1; the metal hydroxide flame retardant in the raw materials includes magnesium hydroxide and aluminum hydroxide; the addition ratio of magnesium hydroxide to aluminum hydroxide in the metal hydroxide flame retardant is 1:1.

[0046] The added mass ratio of the inorganic phosphorus flame retardant, the metal hydroxide flame retardant, the borate flame retardant and the functional filler in the raw materials is 1:2:1:1.

[0047] The present invention further discloses a method for preparing an environmentally friendly scratch-resistant flame retardant for coatings. Figure 2 This is a flow chart of a method for preparing an environmentally friendly scratch-resistant flame retardant for coatings in one embodiment of the present invention; please refer to Figure 2 , the preparation method comprises:

[0048] [Step S1] Add inorganic phosphorus flame retardants, metal hydroxide flame retardants, borate flame retardants, and other functional fillers into the diluent and stir. After stirring for a set time, a flame retardant slurry is obtained.

[0049] In one embodiment, the speed of the stirrer is 1000-3000 r / min, and the stirring time is 5-15 min, then the stirring is stopped.

[0050] [Step S2] Add the flame retardant slurry to the non-flame retardant coating and stir again, measure the viscosity of the coating, and stop stirring when the appropriate viscosity is reached.

[0051] In one embodiment, the rotation speed of the stirrer may be 1000-3000 r / min, and the suitable viscosity range may be 500-2000 cp.

[0052] [Step S3] The modified coating is applied twice, namely, primer coating and top coating. By controlling the amount of coating used in the two coatings, the coating is evenly applied and the product performance is excellent.

[0053] In one embodiment, the primer coating amount is controlled at 20 to 30 g / m 2 , the top coating amount is controlled at 10~20g / m 2 The total coating amount is controlled at 30-50g / m 2 .

[0054] Example 1

[0055] The present embodiment provides a method for preparing an environmentally friendly scratch-resistant flame retardant for coatings. The flame retardant is prepared from raw materials comprising the following parts by mass: 1.5 parts of ammonium polyphosphate, 1.5 parts of aluminum hypophosphite, 3 parts of aluminum hydroxide, 3 parts of magnesium hydroxide, 3 parts of zinc borate, 1 part of aluminum oxide, 1 part of silicon carbide, and 1 part of boron nitride.

[0056] The specific preparation method comprises the following steps:

[0057] The raw materials required in the above Example 1 are added with a diluent, mixed in a stirrer with a rotation speed of 2000 r / min, and the stirring time reaches 10 minutes, and then the stirring is stopped to obtain a flame retardant slurry;

[0058] The flame retardant slurry is added to the non-flame retardant coating, and stirred in a stirrer at a rotation speed of 2000 r / min. When the viscosity reaches 1500 cp, stirring is stopped to obtain the flame retardant coating;

[0059] The flame retardant coating is applied twice, divided into primer and topcoat, and the primer coating amount is 20g / m 2 , top coating weight is 18g / m 2 , the total coating amount is 38g / m 2 .

[0060] Example 2

[0061] The present embodiment provides a method for preparing an environmentally friendly scratch-resistant flame retardant for coatings. The flame retardant is prepared from raw materials comprising the following parts by mass: 2 parts of ammonium polyphosphate, 1 part of aluminum hypophosphite, 1 part of magnesium hypophosphite, 4 parts of aluminum hydroxide, 4 parts of magnesium hydroxide, 3 parts of zinc borate, 1 part of ammonium borate, 3 parts of aluminum oxide, and 1 part of boron nitride.

[0062] The specific preparation method comprises the following steps:

[0063] The raw materials required in the above Example 2 were added with a diluent, mixed in a stirrer with a rotation speed of 2500 r / min, and the stirring time reached 8 minutes, and then the stirring was stopped to obtain a flame retardant slurry;

[0064] The flame retardant slurry is added to the non-flame retardant coating, and stirred in a stirrer at a rotation speed of 2500 r / min. When the viscosity reaches 1800 cp, stirring is stopped to obtain the flame retardant coating;

[0065] The flame retardant coating is applied twice, divided into primer and topcoat, and the primer coating amount is 25g / m 2 , top coating weight is 17g / m 2 , the total coating amount is 42g / m 2 .

[0066] Example 3

[0067] The present embodiment provides a method for preparing an environmentally friendly scratch-resistant flame retardant for coatings. The flame retardant is prepared from the following raw materials in parts by weight: 2.5 parts of ammonium polyphosphate, 1 part of aluminum hypophosphite, 1 part of magnesium hypophosphite, 0.5 part of calcium hypophosphite, 5 parts of aluminum hydroxide, 5 parts of magnesium hydroxide, 2 parts of zinc borate, 2 parts of ammonium borate, 1 part of barium metaborate, 2 parts of aluminum oxide, 1 part of silicon carbide, and 2 parts of boron nitride.

[0068] The specific preparation method comprises the following steps:

[0069] The raw materials required in the above Example 3 were added with a diluent, mixed in a stirrer with a rotation speed of 1500 r / min, and the stirring time reached 12 min, and then the stirring was stopped to obtain a flame retardant slurry;

[0070] The flame retardant slurry is added to the non-flame retardant coating, and stirred in a stirrer at a rotation speed of 1500 r / min. When the viscosity reaches 1000 cp, stirring is stopped to obtain the flame retardant coating;

[0071] The flame retardant coating is applied twice, divided into primer and topcoat, and the primer coating amount is 28g / m 2 , top coating weight is 12g / m 2 , the total coating amount is 40g / m 2 .

[0072] Example 4

[0073] The present embodiment provides a method for preparing an environmentally friendly scratch-resistant flame retardant for coatings. The flame retardant is prepared from raw materials comprising the following parts by mass: 3 parts of ammonium polyphosphate, 2 parts of magnesium hypophosphite, 1 part of calcium hypophosphite, 6 parts of aluminum hydroxide, 6 parts of magnesium hydroxide, 4 parts of zinc borate, 2 parts of barium metaborate, 3 parts of aluminum oxide, 1 part of silicon carbide, and 2 parts of boron nitride.

[0074] The specific preparation method comprises the following steps:

[0075] The raw materials required in the above Example 4 were added with a diluent, mixed in a stirrer with a rotation speed of 3000 r / min, and the stirring time reached 7 minutes, and then the stirring was stopped to obtain a flame retardant slurry;

[0076] The flame retardant slurry is added to the non-flame retardant coating, and stirred in a stirrer at a rotation speed of 3000 r / min. When the viscosity reaches 700 cp, stirring is stopped to obtain the flame retardant coating;

[0077] The flame retardant coating is applied twice, divided into primer and topcoat, and the primer coating amount is 27g / m 2 , top coating weight is 19g / m 2 , the total coating amount is 46g / m 2 .

[0078] Comparative Example 1

[0079] This comparative example provides a non-flame retardant coating without adding a flame retardant, and the specific preparation method comprises the following steps:

[0080] Add the non-flame retardant coating to the stirrer, stir it in the stirrer at a rotation speed of 2000 r / min, measure the viscosity and reach 1500 cp, then stop stirring to obtain the non-flame retardant coating;

[0081] The non-flame retardant coating is applied twice, divided into primer and topcoat, and the primer coating amount is 20g / m 2 , top coating weight is 18g / m 2 , the total coating amount is 38g / m 2 .

[0082] Comparative Example 2

[0083] This comparative example provides a method for preparing a single flame retardant for coatings. The flame retardant is prepared from raw materials comprising the following parts by mass: 20 parts of aluminum hydroxide and 20 parts of magnesium hydroxide.

[0084] The specific preparation method comprises the following steps:

[0085] The raw materials required in the above comparative example 2 were added with a diluent, mixed in a stirrer with a rotation speed of 2000 r / min, and the stirring time reached 10 min, and then the stirring was stopped to obtain a flame retardant slurry;

[0086] The flame retardant slurry is added to the non-flame retardant coating, and stirred in a stirrer at a rotation speed of 2000 r / min. When the viscosity reaches 1500 cp, stirring is stopped to obtain the flame retardant coating;

[0087] The flame retardant coating is applied twice, divided into primer and topcoat, and the primer coating amount is 20g / m 2 , top coating weight is 18g / m 2 , the total coating amount is 38g / m 2 .

[0088] Flame retardant performance test:

[0089] The samples prepared in Examples 1, 2, 3, 4 and Comparative Examples 1 and 2 were subjected to critical radiation heat flux tests. The test results are shown in Table 1.

[0090] Table 1 Critical radiation heat flux test data table of Examples 1, 2, 3, 4 and Comparative Examples 1 and 2

[0091]

[0092]

[0093] From the test results in Table 1, it can be seen that the critical radiation heat flux test data of the samples prepared after applying the environmentally friendly scratch-resistant flame retardant for coatings in the embodiments of the present invention are higher than those of the samples prepared in Comparative Examples 1 and 2. The larger the critical radiation heat flux value, the better the flame retardancy and self-extinguishing property of the sample. It can be seen that the samples prepared using the compound environmentally friendly flame retardant have better flame retardant effect than the samples prepared using a single excess flame retardant or no flame retardant while meeting the environmental protection requirements.

[0094] Scratch resistance, scratch resistance (Martindale) test:

[0095] The samples prepared in Examples 1, 2, 3, 4 and Comparative Examples 1 and 2 were subjected to scratch resistance and abrasion resistance (Martindale) tests. The test results are shown in Table 2.

[0096] Table 2 Scratch resistance and scratch resistance (Martindale) performance test data of Examples 1, 2, 3, 4 and Comparative Examples 1 and 2

[0097]

[0098] It can be seen from the test results in Table 2 that the scratch resistance test data of the samples prepared after the application of the environmentally friendly scratch-resistant flame retardant for coatings in the embodiments of the present invention are higher than those of the samples prepared in Comparative Examples 1 and 2; under the same load conditions, the Martindale test grades of the samples prepared in the embodiments are all ≤ Grade 2, while the samples prepared in Comparative Examples 1 and 2 reach Grade 2 and Grade 4, respectively. In the scratch resistance test results, the higher the value, the better the scratch resistance of the sample; in the Martindale test results, the lower the grade, the better the scratch resistance of the sample. Scratch resistance and scratch resistance are important indicators of the usability of reactive coatings and flame retardants. Poor scratch resistance and scratch resistance means that the coating has poor usability. It can be seen that compared with the single excess flame retardant and no flame retardant in Comparative Examples 1 and 2, the samples prepared after the application of the compound environmentally friendly scratch-resistant flame retardant have better scratch resistance and scratch resistance while meeting environmental protection requirements. It also shows that the coating prepared with the compound environmentally friendly scratch-resistant flame retardant has better usability than the coating prepared with a single excess flame retardant or without a flame retardant, which further shows that the compound environmentally friendly scratch-resistant flame retardant has better usability.

[0099] Adhesion performance test:

[0100] The samples prepared in Examples 1, 2, 3, 4 and Comparative Examples 1 and 2 were tested for adhesion performance. The test results are shown in Table 3.

[0101] Table 3 Adhesion performance test data of Examples 1, 2, 3, 4 and Comparative Examples 1 and 2

[0102]

[0103] From the test results in Table 3, it can be seen that the samples prepared after the application of the environmentally friendly scratch-resistant flame retardant for coatings in the embodiment of the present invention have no falling off / peeling off after the adhesion test, while the samples prepared in Comparative Example 2 have falling off / peeling off, which means that the coating has poor bonding ability with related products, further indicating that the usability of the coating and the flame retardant are poor. It can be seen that the environmentally friendly scratch-resistant composite flame retardant is more valuable than a single excess flame retardant, and the coating prepared after application has higher adhesion and stronger bonding with related products.

[0104] Based on the above critical radiant heat flux, scratch resistance, scratch resistance (Martindale), and adhesion test results, it can be seen that the coating prepared using the environmentally friendly scratch-resistant flame retardant for coatings provided by the present invention has significantly improved flame retardant properties, and slightly improved scratch resistance and scratch resistance compared to non-flame retardant coatings without adding flame retardants; compared to flame retardant coatings prepared with a single excess flame retardant, scratch resistance, scratch resistance, and adhesion performance are significantly improved, and flame retardant properties are slightly improved. Therefore, the preparation method of an environmentally friendly scratch-resistant flame retardant for coatings provided by the present invention and its application have significant beneficial effects.

[0105] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications also fall within the scope of protection of the present invention.

[0106] In summary, the environmentally friendly scratch-resistant flame retardant for coatings and the preparation method thereof proposed in the present invention can improve the flame retardancy, scratch resistance and environmental protection of the flame retardant.

[0107] The present invention conducts a critical radiation heat flux test on the coated modified product to characterize the flame retardant properties of the coating, and further provides feedback on the flame retardant properties of the flame retardant for the coating; the present invention conducts scratch resistance, scratch resistance (Martindale), and adhesion performance tests on the coated modified product to characterize the physical properties and usability of the coating, and further provides feedback on the usability of the flame retardant.

[0108] It can be seen from the above technical solutions that compared with the prior art, the present invention has the following beneficial effects:

[0109] The present invention uses an environmentally friendly scratch-resistant compound flame retardant, and the prepared coating is further coated on related products to prepare test samples. The critical radiant heat flux of the samples prepared using the environmentally friendly scratch-resistant compound flame retardant is greater than 6.5kw / m2, while the critical radiant heat flux of the samples prepared without flame retardant is only 4.22kw / m2; the scratch resistance of the samples prepared using the environmentally friendly scratch-resistant compound flame retardant can reach more than 5N, while the scratch resistance of the samples prepared with a single excess flame retardant is only 2N; in the scratch resistance test under 38N load test conditions, the Martindale test grade of the samples prepared using the environmentally friendly scratch-resistant compound flame retardant is ≤2, while the Martindale test grade of the samples prepared with a single excess flame retardant is only 4. After the adhesion test under the same conditions, the samples prepared using the environmentally friendly scratch-resistant compound flame retardant did not fall off / peel off, while the samples prepared with a single excess flame retardant fell off and peeled off. It can be seen that the coating prepared by using the environmentally friendly scratch-resistant flame retardant for coatings provided by the present invention has significantly improved flame retardant properties, and slightly improved scratch resistance and abrasion resistance compared to non-flame retardant coatings without adding flame retardants; compared to flame retardant coatings prepared by using a single excessive flame retardant, the scratch resistance, abrasion resistance, and adhesion properties are significantly improved, and the flame retardant properties are slightly improved. Therefore, the preparation method of an environmentally friendly scratch-resistant flame retardant for coatings provided by the present invention and its application have significant beneficial effects.

[0110] The present invention removes environmentally harmful flame retardants such as halogen and antimony-containing flame retardants in existing flame retardants, and the flame retardant of the present invention is environmentally friendly; at the same time, the present invention adds functional fillers such as silicon carbide and aluminum oxide, which can effectively increase the scratch resistance of the flame retardant after application; in addition, aluminum oxide and boron nitride can form a heat conduction path, effectively promote the transfer and release of heat, and increase flame retardancy.

[0111] In the technical effects produced by the application of the above-mentioned environmentally friendly scratch-resistant compound flame retardant, the present invention shows in detail the flame retardant test data of the comparative examples and the test samples of the embodiments. Similarly, for the scratch resistance, abrasion resistance and adhesion of the above-mentioned test samples, the present invention shows in detail the specific test data. The characterization method of synchronously digitizing the multiple characteristics of the test samples, such as flame retardancy, scratch resistance, abrasion resistance and adhesion, is not reflected in the existing technical solutions. Therefore, the technical effects shown by the present invention should also be regarded as an indispensable part of the creativity and novelty of the present invention.

[0112] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0113] The description and application of the present invention here are illustrative, and it is not intended to limit the scope of the present invention to the above-mentioned embodiments. The effects or advantages involved in the embodiments may not be embodied in the embodiments due to interference from various factors, and the description of the effects or advantages is not used to limit the embodiments. The deformation and change of the embodiments disclosed here are possible, and the replacement of the embodiments and the various equivalent parts are well known to those of ordinary skill in the art. It should be clear to those skilled in the art that the present invention can be implemented in other forms, structures, arrangements, proportions, and with other components, materials and parts without departing from the spirit or essential features of the present invention. Other deformations and changes can be made to the embodiments disclosed here without departing from the scope and spirit of the present invention.

Claims

1. An environmentally friendly scratch-resistant flame retardant for coatings, characterized in that: The environmentally friendly scratch-resistant flame retardant for coating is prepared from raw materials containing the following parts by mass: 1 to 10 parts of inorganic phosphorus flame retardant, 1 to 20 parts of metal hydroxide flame retardant, 1 to 10 parts of borate flame retardant, and 1 to 10 parts of functional filler.

2. The environmentally friendly scratch-resistant flame retardant for coatings according to claim 1, characterized in that: The functional filler in the raw material includes at least one of aluminum oxide, silicon carbide and boron nitride.

3. The functional filler according to claim 2, characterized in that: The aluminum oxide structure in the functional filler is spherical, and the boron nitride structure is flaky.

4. The environmentally friendly scratch-resistant flame retardant for coatings according to claim 1, characterized in that: The inorganic phosphorus flame retardant in the raw material includes at least one of ammonium polyphosphate, aluminum hypophosphite, magnesium hypophosphite and calcium hypophosphite; The metal hydroxide flame retardant in the raw material includes at least one of magnesium hydroxide and aluminum hydroxide; The borate flame retardant in the raw material includes at least one of zinc borate, barium metaborate and ammonium borate.

5. The environmentally friendly scratch-resistant flame retardant for coatings according to claim 1, characterized in that: The inorganic phosphorus flame retardant in the raw material includes ammonium polyphosphate and aluminum hypophosphite; the addition ratio of ammonium polyphosphate to hypophosphite in the inorganic phosphorus flame retardant is 1:1; The metal hydroxide flame retardant in the raw materials includes magnesium hydroxide and aluminum hydroxide; the addition ratio of magnesium hydroxide to aluminum hydroxide in the metal hydroxide flame retardant is 1:

1.

6. The environmentally friendly scratch-resistant flame retardant for coatings according to claim 1, characterized in that: The added mass ratio of the inorganic phosphorus flame retardant, the metal hydroxide flame retardant, the borate flame retardant and the functional filler in the raw materials is 1:2:1:

1.

7. A method for preparing an environmentally friendly scratch-resistant flame retardant for coatings, characterized in that: The preparation method comprises: Step S1, adding inorganic phosphorus flame retardants, metal hydroxide flame retardants, borate flame retardants, and other functional fillers into a diluent and stirring for a set time to obtain a flame retardant slurry. Step S2: adding the flame retardant slurry into the non-flame retardant coating and stirring again, measuring the viscosity of the coating, and stopping stirring after reaching a suitable viscosity. Step S3: The modified coating is applied twice, namely, primer coating and top coating. By controlling the amount of coating used in the two coatings, uniform coating of the coating is ensured and excellent product performance is achieved.

8. The preparation method according to claim 7, characterized in that: In step S1, the speed of the stirrer is 1000-3000 r / min, and the stirring time reaches 5-15 min, then the stirring is stopped.

9. The preparation method according to claim 7, characterized in that: In step S2, the speed of the stirrer is 1000-3000 r / min, and the suitable viscosity range is 500-2000 cp.

10. The preparation method according to claim 7, characterized in that: In step S3, the primer coating amount is controlled at 20 to 30 g / m 2 , the top coating amount is controlled at 10~20g / m 2 The total coating amount is controlled at 30-50g / m 2 .

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