A low temperature resistant fireproof coating and preparation method thereof

Abstract

The present invention relates to a low-temperature fireproof coating and a preparation method thereof, and relates to the technical field of fireproof coatings. The low-temperature fireproof coating comprises the following components by weight: 15-25 parts of aqueous resin emulsion, 12-20 parts of pentaerythritol, 8-16 parts of ammonium polyphosphate, 4-10 parts of melamine, 10-15 parts of pigments and fillers, 1-10 parts of low-temperature resistant additives, 0.5-6 parts of curing agents, and 18-28 parts of water; the low-temperature resistant additives are composed of polyaspartic acid esters, acetate esters, and diol compounds. The low-temperature fireproof coating provided by the present invention comprises a low-temperature resistant additive composed of polyaspartic acid esters, acetate esters, and diol compounds. The three are used in combination to effectively improve the antifreeze effect of the coating in a low-temperature operating environment, thereby significantly improving the low-temperature resistance of the fireproof coating, and effectively solving the problem of poor low-temperature resistance of the existing fireproof coating.

Description

Technical Field

[0001] The present application relates to the technical field of fire retardant coatings, and in particular to a low-temperature resistant fire retardant coating and a preparation method thereof. Background Art

[0002] At present, there are a wide variety of fire retardant coatings on the market, such as decorative fire retardant coatings, wood fire retardant coatings, steel structure fire retardant coatings, concrete structure fire retardant coatings, tunnel fire retardant coatings, cable fire retardant coatings, etc. Fire retardant coatings are mainly composed of coating components such as base materials (i.e. film-forming substances), pigments, common coating additives, fire retardant additives and dispersion media. Except for fire retardant additives, the functions of other coating components in coatings are basically the same as those in ordinary coatings, but some have special requirements in terms of performance and dosage. For example, in order to meet the use requirements in low temperature environments, such as tunnel fire retardant coatings in severe cold areas, not only are the coatings required to have excellent fire retardant properties, but more importantly, the fire retardant coatings are also required to have excellent low temperature resistance to avoid the problem that the fire retardant coating has been partially ineffective due to the damage of the low temperature environment when a fire occurs and cannot provide effective protection for the substrate.

[0003] Therefore, it is particularly important to develop a fire retardant coating that has both excellent low-temperature resistance and fire resistance, which can effectively broaden the application of fire retardant coatings. Summary of the invention

[0004] The present application provides a low-temperature resistant fire-retardant coating and a preparation method thereof, so as to solve the technical problems of poor low-temperature resistance of existing fire-retardant coatings.

[0005] In a first aspect, the present application provides a low-temperature resistant fire retardant coating, which comprises the following components in parts by weight:

[0006] 15-25 parts of water-based resin emulsion, 12-20 parts of pentaerythritol, 8-16 parts of ammonium polyphosphate, 4-10 parts of melamine, 10-15 parts of pigments and fillers, 1-10 parts of low-temperature resistant additives, 0.5-6 parts of curing agent and 18-28 parts of water;

[0007] The low temperature resistant additive is composed of polyaspartic acid ester, acetate and diol compounds.

[0008] Furthermore, the low temperature resistant fire retardant coating comprises the following components in parts by weight:

[0009] 18-21 parts of water-based resin emulsion, 15-18 parts of pentaerythritol, 12-15 parts of ammonium polyphosphate, 6-9 parts of melamine, 12-14 parts of pigments and fillers, 4-8 parts of low-temperature resistant additives, 2-5 parts of curing agent and 20-24 parts of water.

[0010] Furthermore, the weight ratio of the polyaspartic acid ester, the acetate and the diol compound is (7-10):(1-3):(3-5).

[0011] Furthermore, the diol compound includes at least one of ethylene glycol, 1,2-propylene glycol and 1,3-propylene glycol.

[0012] Furthermore, the aqueous resin emulsion is an aqueous acrylic emulsion.

[0013] Furthermore, the curing agent is a diisocyanate compound.

[0014] Furthermore, the low-temperature resistant fire-retardant coating further comprises, by weight: 0.5 to 3 parts of a stabilizer and 0.5 to 3 parts of a dispersant.

[0015] Furthermore, the stabilizer is a titanate coupling agent, and the dispersant is a polyurethane dispersant.

[0016] In a second aspect, the present application provides a method for preparing the low-temperature resistant fire retardant coating according to any one of the first aspects, the preparation method comprising:

[0017] The pentaerythritol, ammonium polyphosphate, melamine and pigments and fillers are first mixed to obtain a first mixture;

[0018] Performing a second mixing on the remaining components in the low-temperature resistant fire retardant coating to obtain a second mixture;

[0019] The first mixed material and the second mixed material are mixed for the third time to obtain the low-temperature resistant fire retardant coating.

[0020] Furthermore, the third mixing adopts an ultrasonic stirring mixing method, and the working parameters of the ultrasonic stirring mixing include: ultrasonic power of 900W to 1100W, stirring speed of 4000 to 7000rpm / min, and stirring time of 10 to 25 minutes.

[0021] The above technical solution provided by the embodiment of the present application has at least the following advantages compared with the prior art:

[0022] The embodiment of the present application provides a low-temperature resistant fire-retardant coating, which includes a low-temperature resistant additive composed of polyaspartic acid ester, acetate ester and diol compounds. The low-temperature curing performance of the water-based resin film-forming material can be effectively improved by the polyaspartic acid resin; the acetate ester has good antifreeze properties, can effectively inhibit the expansion of water in the coating system and improve the adhesion of the coating film; diol compounds such as ethylene glycol have strong water absorption and slow escape speed in the coating film, and can lower the freezing point of the system; the combination of the three can effectively improve the antifreeze effect of the coating in a low-temperature operating environment, thereby significantly improving the low-temperature resistance of the fire-retardant coating; at the same time, the expansion fire-retardant system composed of an appropriate proportion of water-based resin emulsion, pentaerythritol, ammonium polyphosphate, melamine and pigments and fillers is used to obtain a low-temperature resistant fire-retardant coating with both excellent low-temperature resistance and fire resistance, which effectively solves the problem of poor low-temperature resistance of existing fire-retardant coatings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0025] Figure 1 A schematic flow chart of a method for preparing a low-temperature resistant fire retardant coating provided in an embodiment of the present application. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0027] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.

[0028] In a first aspect, the present application provides a low-temperature resistant fire retardant coating, which comprises the following components in parts by weight:

[0029] 15-25 parts of water-based resin emulsion, 12-20 parts of pentaerythritol, 8-16 parts of ammonium polyphosphate, 4-10 parts of melamine, 10-15 parts of pigments and fillers, 1-10 parts of low-temperature resistant additives, 0.5-6 parts of curing agent and 18-28 parts of water;

[0030] The low temperature resistant additive is composed of polyaspartic acid ester, acetate and diol compounds.

[0031] The embodiment of the present application provides a low-temperature resistant fire-retardant coating, which includes a low-temperature resistant additive composed of polyaspartic acid ester, acetate ester and diol compounds. The low-temperature curing performance of the water-based resin film-forming material can be effectively improved by the polyaspartic acid resin; the acetate ester has good antifreeze properties, can effectively inhibit the expansion of water in the coating system and improve the adhesion of the coating film; diol compounds such as ethylene glycol have strong water absorption and slow escape speed in the coating film, and can lower the freezing point of the system; the combination of the three can effectively improve the antifreeze effect of the coating in a low-temperature operating environment, thereby significantly improving the low-temperature resistance of the fire-retardant coating; at the same time, the expansion fire-retardant system composed of an appropriate proportion of water-based resin emulsion, pentaerythritol, ammonium polyphosphate, melamine and pigments and fillers is used to obtain a low-temperature resistant fire-retardant coating with both excellent low-temperature resistance and fire resistance, which effectively solves the problem of poor low-temperature resistance of existing fire-retardant coatings.

[0032] In some specific embodiments, the aqueous resin emulsion described in the present application can be commercially available, such as aqueous acrylic resin emulsion, aqueous styrene-acrylic resin emulsion, aqueous vinyl acetate-acrylic resin emulsion, aqueous vinyl acetate-styrene resin emulsion, etc. In parts by weight, the aqueous resin emulsion can be 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, etc.

[0033] In some specific embodiments, the pentaerythritol may be 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, etc., by weight.

[0034] In some specific embodiments, the ammonium polyphosphate may be 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, etc., by weight.

[0035] In some specific embodiments, the melamine may be 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, etc., by weight.

[0036] In some specific embodiments, the pigments and fillers described in the present application can be selected from at least one of glass powder, talcum powder, calcium carbonate and titanium dioxide. In terms of weight, the pigments and fillers can be 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, etc.

[0037] In some specific embodiments, the low-temperature resistant additive may be 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, etc., by weight.

[0038] In some specific embodiments, the curing agent may be 0.5 parts, 1 parts, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, etc., by weight.

[0039] In some specific embodiments, the water may be 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, etc., by weight.

[0040] Preferably, the low temperature resistant fire retardant coating comprises the following components in parts by weight:

[0041] 18-21 parts of water-based resin emulsion, 15-18 parts of pentaerythritol, 12-15 parts of ammonium polyphosphate, 6-9 parts of melamine, 12-14 parts of pigments and fillers, 4-8 parts of low-temperature resistant additives, 2-5 parts of curing agent and 20-24 parts of water.

[0042] More preferably, the low temperature resistant fire retardant coating comprises the following components in parts by weight:

[0043] 19 parts of water-based resin emulsion, 16 parts of pentaerythritol, 13 parts of ammonium polyphosphate, 8 parts of melamine, 13 parts of pigments and fillers, 7 parts of low-temperature resistant additives, 4 parts of curing agent and 21 parts of water.

[0044] As an implementation method of the examples of the present application, the weight ratio of the polyaspartic acid ester, the acetate and the diol compound is (7-10):(1-3):(3-5).

[0045] The applicant has found through research that the weight ratio of the polyaspartic acid ester, the acetate ester and the diol compound is controlled to be (7-10):(1-3):(3-5), the synergistic effect of the three is better, and the low temperature resistance of the fire retardant coating can be significantly improved. Preferably, the weight ratio of the polyaspartic acid ester, the acetate ester and the diol compound is 9:2.5:4.

[0046] As an implementation of an embodiment of the present application, the diol compound includes at least one of ethylene glycol, 1,2-propylene glycol and 1,3-propylene glycol.

[0047] Preferably, the diol compounds described in the present application may be selected from ethylene glycol, 1,2-propylene glycol and 1,3-propylene glycol, etc., which have good synergistic effects with polyaspartic acid esters and acetates.

[0048] As an implementation of an example of the present application, the aqueous resin emulsion is an aqueous acrylic emulsion.

[0049] Preferably, the water-based resin emulsion described in the present application is a water-based acrylic emulsion, and specifically, commercially available HD2087 water-based acrylic emulsion, HD2081 water-based acrylic emulsion, etc. may be used, and the effect is better when used in combination with a low-temperature resistant additive.

[0050] As an implementation of an example of the present application, the curing agent is a diisocyanate compound.

[0051] The curing agent described in the present application may be selected from diisocyanate compounds such as 4,4'-diphenylmethane diisocyanate, methylcyclohexyl diisocyanate, etc.

[0052] As an implementation of the embodiment of the present application, the low temperature resistant fire retardant coating further comprises, by weight: 0.5 to 3 parts of a stabilizer and 0.5 to 3 parts of a dispersant. .

[0053] The present application is more conducive to the stability of the entire low-temperature fire-retardant coating system by adding a stabilizer and a dispersant, and is more conducive to storage and transportation. In some specific embodiments, the stabilizer can be a commercially available titanate coupling agent, such as titanate coupling agent NXH-201, titanate coupling agent TMC-TTS, etc.; the dispersant can be a commercially available polyurethane dispersant, such as polyurethane dispersant KOS163, UNIQSPERSE 550S polyurethane dispersant, etc.

[0054] It should be noted that, unless otherwise specified or specified, all components involved in the low-temperature resistant fire retardant coating provided in the embodiments of the present application can be commercially available products.

[0055] In a second aspect, based on a general inventive concept, the present application provides a method for preparing the low-temperature resistant fire retardant coating according to any one of the first aspects, such as Figure 1 As shown, the preparation method comprises:

[0056] The pentaerythritol, ammonium polyphosphate, melamine and pigments and fillers are first mixed to obtain a first mixture;

[0057] Performing a second mixing on the remaining components in the low-temperature resistant fire retardant coating to obtain a second mixture;

[0058] The first mixed material and the second mixed material are mixed for the third time to obtain the low-temperature resistant fire retardant coating.

[0059] The preparation method of the low-temperature fire-retardant coating provided by the present application is simple to operate, does not require additional specific equipment, and is suitable for industrial production. At the same time, the preparation method of the low-temperature fire-retardant coating is based on the low-temperature fire-retardant coating described in any one of the first aspects above, so it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0060] In some specific embodiments, the first mixing and the second mixing can be carried out by conventional stirring and mixing methods in the art, such as room temperature mixing and stirring.

[0061] As an implementation mode of an embodiment of the present application, the third mixing adopts an ultrasonic stirring mixing method, and the working parameters of the ultrasonic stirring mixing include: ultrasonic power of 900W to 1100W, stirring speed of 4000 to 7000rpm / min, and stirring time of 10 to 25 minutes.

[0062] The present application adopts an ultrasonic mixing and rapid stirring method in the final stirring and mixing process for preparing the low-temperature resistant fire-retardant coating, which is conducive to forming a more uniform and stable mixing system.

[0063] The present application will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are intended only to illustrate the present application and are not intended to limit the scope of the present application. The experimental methods for which specific conditions are not specified in the following examples are usually measured according to national standards. If there is no corresponding national standard, then the conditions recommended by the manufacturer are followed.

[0064] Example 1

[0065] This embodiment provides a low-temperature resistant fire retardant coating, which includes the following components in parts by weight (in kg):

[0066] 19 parts of water-based resin emulsion, 16 parts of pentaerythritol, 13 parts of ammonium polyphosphate, 8 parts of melamine, 13 parts of pigments and fillers, 7 parts of low-temperature resistant additives, 4 parts of curing agent, 1.5 parts of titanate coupling agent, 2 parts of polyurethane dispersant and 21 parts of water;

[0067] Wherein, the low temperature resistant additive is composed of polyaspartic acid ester, acetate and ethylene glycol in a weight ratio of 9:2.5:4;

[0068] The aqueous resin emulsion is an aqueous acrylic emulsion;

[0069] The pigment and filler are composed of titanium dioxide, talcum powder and glass powder in a weight ratio of 2:1:1.5;

[0070] The curing agent is methyl cyclohexyl diisocyanate.

[0071] The preparation method of the above-mentioned low-temperature resistant fire retardant coating comprises the following steps:

[0072] The pentaerythritol, ammonium polyphosphate, melamine and pigments and fillers are first mixed to obtain a first mixture;

[0073] Performing a second mixing on the remaining components in the low-temperature resistant fire retardant coating to obtain a second mixture;

[0074] The first mixture and the second mixture are mixed for the third time to obtain the low-temperature resistant fire retardant coating; wherein the third mixing adopts an ultrasonic stirring mixing method, and the working parameters of the ultrasonic stirring mixing include: ultrasonic power of 900W, stirring speed of 6000rpm / min, and stirring time of 15 minutes.

[0075] The low temperature fire retardant coating obtained in this example was subjected to freeze-thaw cycle resistance test and fire resistance limit test according to the requirements of standard GB14907-2002 "Fire Retardant Coating for Steel Structure". The test results are shown in Table 1; among them, the qualified requirement for freeze-thaw cycle resistance test is that the coating does not crack, delaminate or fall off after ≥15 times; the qualified requirement for fire resistance limit is ≥2.00h.

[0076] Table 1

[0077] Test items Test Results Freeze-thaw cycle resistance / number of times The coating will not crack, peel or fall off after 50 cycles. Fire resistance limit / h Qualified, ≥2.00h (standard heating)

[0078] At the same time, the impact resistance test was carried out according to the standard GB / T1732-1993, and the impact resistance (kg / cm2) of the low-temperature fire retardant coating obtained in this example at -20°C was 62kg / cm2.

[0079] Examples 2-14 investigate the effect of the amount of each component in the low-temperature resistant additive on the performance of the low-temperature resistant fire retardant coating.

[0080] On the basis of Example 1, Examples 2-14 only adjusted the usage ratio of each component (the remaining steps and parameters are the same as Example 1). The usage ratio of each component in Examples 2-14 is shown in Table 2, and the test results are shown in Table 3; wherein, in Table 1, "0:2.5:4" in Example 2 represents "no polyaspartic acid ester is added", "9:0:4" in Example 7 represents "no acetate is added", and "9:2.5:0" in Example 11 represents "no ethylene glycol is added".

[0081] Table 2

[0082]

[0083] Table 3

[0084]

[0085]

[0086] Embodiment 15

[0087] This example provides a low-temperature resistant fire-retardant coating, which differs from Example 1 only in that the aqueous resin emulsion is adjusted to an aqueous vinyl acetate-styrene resin emulsion; the remaining steps and parameters are the same.

[0088] The low-temperature fire-retardant coating obtained in this embodiment was subjected to freeze-thaw cycle test according to the requirements of standard GB14907-2002 "Fire-retardant coating for steel structures". The result was qualified. The coating did not crack after 38 cycles, and there was no delamination or shedding. The fire resistance limit test was qualified.

[0089] Example 16

[0090] This example provides a low-temperature resistant fire-retardant coating, which differs from Example 1 only in that, measured by weight (in kg), the low-temperature resistant fire-retardant coating includes the following components: 15 parts of aqueous resin emulsion, 12 parts of pentaerythritol, 8 parts of ammonium polyphosphate, 6 parts of melamine, 13 parts of pigments and fillers, 4 parts of low-temperature resistant additives, 3 parts of curing agent, 1.5 parts of titanate coupling agent, 2 parts of polyurethane dispersant and 20 parts of water; the remaining steps and parameters are the same.

[0091] The low-temperature fire-retardant coating obtained in this embodiment was tested for freeze-thaw resistance according to the requirements of standard GB14907-2002 "Fire-retardant coating for steel structures". The result was: qualified. The coating did not crack after 36 cycles, and there was no delamination or shedding. The fire resistance limit test was qualified.

[0092] Embodiment 17

[0093] This example provides a low-temperature resistant fire-retardant coating, which differs from Example 1 only in that, measured by weight (in kg), the low-temperature resistant fire-retardant coating includes the following components: 21 parts of aqueous resin emulsion, 18 parts of pentaerythritol, 15 parts of ammonium polyphosphate, 9 parts of melamine, 14 parts of pigments and fillers, 7 parts of low-temperature resistant additives, 3 parts of curing agent, 1.5 parts of titanate coupling agent, 2 parts of polyurethane dispersant and 24 parts of water; the remaining steps and parameters are the same.

[0094] The low-temperature fire-retardant coating obtained in this embodiment was subjected to freeze-thaw cycle test according to the requirements of standard GB14907-2002 "Fire-retardant coating for steel structures". The result was qualified. The coating did not crack after 39 cycles, and there was no delamination or shedding. The fire resistance limit test was qualified.

[0095] Various embodiments of the present application may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be understood as a rigid limitation on the scope of the present application; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numerical values ​​within the range. For example, the range description from 1 to 6 should be considered to have specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which apply regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.

[0096] In the present application, in the absence of any contrary description, the directional words used, such as "upper" and "lower", are specifically the directions of the drawings in the accompanying drawings. In addition, in the description of the present specification, the terms "including", "comprising", etc. refer to "including but not limited to". In this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. In this article, "and / or" describes the association relationship of the associated objects, indicating that there may be three relationships, for example, A and / or B, which can represent: A exists alone, A and B exist at the same time, and B exists alone. Wherein A, B can be singular or plural. In this article, "at least one" refers to one or more, and "plural" refers to two or more. "At least one", "at least one of the following" or similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, "at least one of a, b, or c", or "at least one of a, b and c", can both mean: a, b, c, ab (i.e. a and b), ac, bc or abc, where a, b, c can be single or plural, respectively.

[0097] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A low temperature resistant fire retardant coating, characterized in that: The low temperature resistant fire retardant coating comprises the following components in parts by weight: 19 parts of water-based resin emulsion, 16 parts of pentaerythritol, 13 parts of ammonium polyphosphate, 8 parts of melamine, 13 parts of pigments and fillers, 7 parts of low-temperature resistant additives, 4 parts of curing agent, 1.5 parts of titanate coupling agent, 2 parts of polyurethane dispersant and 21 parts of water; Wherein, the low temperature resistant additive is composed of polyaspartic acid ester, acetate and ethylene glycol in a weight ratio of 9:2.5:4; The aqueous resin emulsion is an aqueous acrylic emulsion; The pigment and filler are composed of titanium dioxide, talcum powder and glass powder in a weight ratio of 2:1:1.5; The curing agent is methyl cyclohexyl diisocyanate; The preparation method of the low temperature resistant fire retardant coating comprises the following steps: The pentaerythritol, ammonium polyphosphate, melamine and pigments and fillers are first mixed to obtain a first mixture; Performing a second mixing on the remaining components in the low-temperature resistant fire retardant coating to obtain a second mixture; The first mixture and the second mixture are mixed for the third time to obtain the low-temperature resistant fire retardant coating; wherein the third mixing adopts an ultrasonic stirring mixing method, and the working parameters of the ultrasonic stirring mixing include: ultrasonic power of 900W, stirring speed of 6000 rpm, and stirring time of 15 minutes.

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