Environmentally friendly fire retardant coating and preparation method thereof

Abstract

The invention relates to a coating, in particular to an environmentally friendly fireproof coating and a preparation method thereof; the environmentally friendly fireproof coating comprises acrylic acid modified bisphenol A type epoxy resin, melamine modified phenolic resin, cyclohexanone peroxide, ammonium polyphosphate, polyester fiber, dispersant, hollow glass microspheres, nano silicon carbide, zinc borate, composite carbon powder, monoalkoxy titanate, glycidyloxypropyl trimethoxy silane, tributyl phosphate and an antioxidant; the invention is improved on the basis of the existing fireproof coating, and polyester fiber without dimensional stability under high temperature state is used to replace glass fiber, so that the coating is easy to shrink with the heat shrinkable sleeve, and the occurrence of wrinkles and cracks is reduced. In addition, after heat shrinkage, the polyester fiber is melted and condensed to form a silk screen, which is beneficial to improve the strength of the coating after heat shrinkage.

Description

Technical Field

[0001] The invention relates to coating, in particular to an environmentally friendly fireproof coating and a preparation method thereof. Background Art

[0002] In modern buildings, there are some narrow building structures, such as weak current wells, strong current wells, water meter rooms, etc. The water and electricity pipe interface connections or joint connections in the above narrow structures are suitable for heat shrink sleeve sleeve connection, and then open flame or hot air spray to shrink the heat shrink sleeve to achieve sealed wrapping. When using open flame, in order to prevent local high temperature from burning the heat shrink sleeve, fire retardant coating can also be applied to the surface of the heat shrink sleeve. But it is easy to understand that if the coating is applied after sleeve connection and heat shrinkage, the operation is inconvenient due to the narrow space; if it is applied before sleeve connection, the fire retardant coating usually has dimensional stability or thermal expansion (to prevent the thermal expansion of the substrate from causing the coating to crack), and wrinkles or cracks will inevitably appear after heat shrinkage, that is to say, the existing fire retardant coating is suitable for thermal expansion substrates but not for heat shrinkage substrates. Summary of the invention

[0003] In view of the deficiencies in the prior art, one of the purposes of the present invention is to provide an environmentally friendly fire retardant coating that is not prone to wrinkling or cracking after the heat shrinkable sleeve is heat shrunk.

[0004] A second object of the present invention is to provide a method for preparing an environmentally friendly fire retardant coating.

[0005] The third object of the present invention is to provide a method for using an environmentally friendly fire retardant coating.

[0006] One of the purposes of the present invention is achieved through the following technical solutions:

[0007] An environmentally friendly fire retardant coating is prepared from the following raw materials in parts by weight:

[0008] 100-150 parts of acrylic acid modified bisphenol A type epoxy resin, 25-35 parts of melamine modified phenolic resin, 12-18 parts of cyclohexanone peroxide, 5-10 parts of ammonium polyphosphate, 12-15 parts of polyester fiber, 1-2 parts of dispersant, 5-10 parts of hollow glass microspheres, 5-8 parts of nano silicon carbide, 5-8 parts of zinc borate, 5-12 parts of composite carbon powder, 10-15 parts of monoalkoxy titanate, 4-7 parts of glycidyloxypropyl trimethoxy silane, 1-3 parts of tributyl phosphate and 1-2 parts of antioxidant.

[0009] Preferably, the polyester fiber has a diameter of 15-25 microns, a length of 300-500 microns, and a melting point of 240-260 degrees Celsius.

[0010] Preferably, the dispersant is mannitol.

[0011] Preferably, the hollow glass microspheres have a particle size of 60-80 microns.

[0012] Preferably, the nano-silicon carbide particle size is 50-80 nanometers.

[0013] Preferably, the particle size of the composite carbon powder is less than or equal to 200 meshes.

[0014] Preferably, the composite carbon powder preparation method is: weigh water, titanium dioxide, aqueous dispersant and bamboo charcoal particles according to a mass ratio of 1000:5:3:100, respectively, stir at 1500 rpm for 20 minutes, filter out the water, and crush the filter cake through a 200-mesh sieve to obtain the composite carbon powder.

[0015] The second object of the present invention is achieved by the following technical solutions:

[0016] A method for preparing an environmentally friendly fire retardant coating comprises the following steps:

[0017] S1 weighs the formula amount of acrylic acid modified bisphenol A epoxy resin, melamine modified phenolic resin, cyclohexanone peroxide, ammonium polyphosphate, polyester fiber, dispersant, hollow glass microspheres, nano silicon carbide, zinc borate, composite carbon powder, monoalkoxy titanate, glycidyloxypropyl trimethoxy silane, tributyl phosphate and antioxidant for standby use;

[0018] S2: mixing and heating acrylic acid-modified bisphenol A epoxy resin, melamine-modified phenolic resin, polyester fiber, dispersant, hollow glass microspheres, nano silicon carbide, zinc borate and composite carbon powder, stirring at a rate of 550-650 rpm and a heating temperature of 65 degrees Celsius for 15 minutes to obtain a suspension;

[0019] S3 adds cyclohexanone peroxide, ammonium polyphosphate, monoalkoxy titanate, glycidyloxypropyl trimethoxysilane, tributyl phosphate and antioxidant to the suspension, mixes and heats, the stirring rate is 550-650 rpm, the heating temperature is 65 degrees Celsius, mixes and heats for 75 minutes to obtain an environmentally friendly fire retardant coating, and sets it aside after cooling.

[0020] The third object of the present invention is achieved by the following technical solutions:

[0021] A method for using an environmentally friendly fireproof coating comprises the following steps: uniformly mixing the environmentally friendly fireproof coating with water and then coating the coating on the surface of a heat shrinkable tube, wherein the coating thickness is 80-150 microns and the mass percentage of water is 10-20%.

[0022] Preferably, the heat shrinkable tube is a polyethylene heat shrinkable tube. As is known, polyethylene heat shrinkable tubes are usually used for refrigeration pipes, cold water pipes, etc., and the strength of polyethylene heat shrinkable tubes themselves is not high. When the coating obtained by the present invention is used in this scenario, the hot-melt polyester fibers in the heat-shrinked coating can quickly condense into a mesh, which can greatly improve the overall strength of the heat shrinkable tube. In addition, it is unexpectedly found that when the environmentally friendly fire-retardant coating is used for polyethylene heat shrinkable tubes, even if a low-temperature coolant is passed through, it is not easy to form dew on the coating surface.

[0023] The beneficial effects of the present invention are as follows: based on the existing fire retardant coating, improvements are made by replacing glass fibers with polyester fibers that have no dimensional stability under high temperature conditions, so that the coating can easily shrink with the heat shrinkable tube, reducing the occurrence of wrinkles and cracks. In addition, after heat shrinkage, the polyester fibers melt and condense to form a silk screen, which is beneficial to improving the strength of the coating after heat shrinkage. DETAILED DESCRIPTION

[0024] The specific embodiments of the present invention are further described below in conjunction with comparative examples: Example 1

[0025] 1) Preparation of composite carbon powder

[0026] Water, titanium dioxide, aqueous dispersant and bamboo charcoal particles were weighed in a mass ratio of 1000:5:3:100, stirred at 1500 rpm for 20 minutes, and then filtered to remove the water. The filter cake was crushed and passed through a 200-mesh sieve to obtain composite carbon powder.

[0027] 2) Weigh the raw materials

[0028] 125 parts of acrylic acid modified bisphenol A type epoxy resin, 30 parts of melamine modified phenolic resin, 15 parts of cyclohexanone peroxide, 7 parts of ammonium polyphosphate, 13 parts of polyester fiber, 1.5 parts of dispersant, 7 parts of hollow glass microspheres, 6 parts of nano silicon carbide, 6 parts of zinc borate, 9 parts of composite carbon powder, 13 parts of monoalkoxy titanate, 5 parts of glycidyloxypropyl trimethoxy silane, 2 parts of tributyl phosphate and 1.5 parts of antioxidant.

[0029] The polyester fiber has a diameter of 20 microns, a length of 400 microns, and a melting point of 255 degrees Celsius. The dispersant is mannitol. The hollow glass microbeads have a particle size of 70 microns. The nano-silicon carbide has a particle size of 60 nanometers.

[0030] 3) Preparation of environmentally friendly fire retardant coatings

[0031] Acrylic acid-modified bisphenol A epoxy resin, melamine-modified phenolic resin, polyester fiber, dispersant, hollow glass microspheres, nano silicon carbide, zinc borate and composite carbon powder are mixed and heated at a stirring rate of 600 rpm and a heating temperature of 65 degrees Celsius, and mixed and heated for 15 minutes to obtain a suspension; cyclohexanone peroxide, ammonium polyphosphate, monoalkoxy titanate, glycidyloxypropyl trimethoxy silane, tributyl phosphate and an antioxidant are added to the suspension and mixed and heated at a stirring rate of 600 rpm and a heating temperature of 65 degrees Celsius, and mixed and heated for 75 minutes to obtain an environmentally friendly fire retardant coating.

[0032] 4) Construction

[0033] The environmentally friendly fireproof coating is mixed with water and then coated on the surface of the heat shrinkable tube, the mass percentage of water is 15%, and the coating thickness is 120 microns. The heat shrinkable tube is a polyethylene heat shrinkable tube (inner diameter 10 mm, wall thickness 2 mm). Example 2

[0034] 1) Preparation of composite carbon powder

[0035] Water, titanium dioxide, aqueous dispersant and bamboo charcoal particles were weighed in a mass ratio of 1000:5:3:100, stirred at 1500 rpm for 20 minutes, and then filtered to remove the water. The filter cake was crushed and passed through a 200-mesh sieve to obtain composite carbon powder.

[0036] 2) Weigh the raw materials

[0037] 110 parts of acrylic acid modified bisphenol A type epoxy resin, 26 parts of melamine modified phenolic resin, 13 parts of cyclohexanone peroxide, 6 parts of ammonium polyphosphate, 13 parts of polyester fiber, 1 part of dispersant, 6 parts of hollow glass microspheres, 6 parts of nano silicon carbide, 6 parts of zinc borate, 6 parts of composite carbon powder, 11 parts of monoalkoxy titanate, 5 parts of glycidyl ether oxypropyl trimethoxy silane, 1 part of tributyl phosphate and 1 part of antioxidant.

[0038] The polyester fiber has a diameter of 16 microns, a length of 310 microns, and a melting point of 250 degrees Celsius. The dispersant is mannitol. The hollow glass microbeads have a particle size of 60 microns. The nano-silicon carbide has a particle size of 60 nanometers.

[0039] 3) Preparation of environmentally friendly fire retardant coatings

[0040] Acrylic acid-modified bisphenol A epoxy resin, melamine-modified phenolic resin, polyester fiber, dispersant, hollow glass microspheres, nano silicon carbide, zinc borate and composite carbon powder are mixed and heated at a stirring rate of 570 rpm and a heating temperature of 65 degrees Celsius, and mixed and heated for 15 minutes to obtain a suspension; cyclohexanone peroxide, ammonium polyphosphate, monoalkoxy titanate, glycidyloxypropyl trimethoxy silane, tributyl phosphate and an antioxidant are added to the suspension and mixed and heated at a stirring rate of 570 rpm and a heating temperature of 65 degrees Celsius, and mixed and heated for 75 minutes to obtain an environmentally friendly fire retardant coating.

[0041] 4) Construction

[0042] The environmentally friendly fireproof coating is mixed with water and then coated on the surface of the heat shrinkable tube, the mass percentage of water is 10%, and the coating thickness is 90 microns. The heat shrinkable tube is a polyethylene heat shrinkable tube (inner diameter 10 mm, wall thickness 2 mm).

[0043] Example 3

[0044] 1) Preparation of composite carbon powder

[0045] Water, titanium dioxide, aqueous dispersant and bamboo charcoal particles were weighed in a mass ratio of 1000:5:3:100, stirred at 1500 rpm for 20 minutes, and then filtered to remove the water. The filter cake was crushed and passed through a 200-mesh sieve to obtain composite carbon powder.

[0046] 2) Weigh the raw materials

[0047] 140 parts of acrylic acid modified bisphenol A type epoxy resin, 34 parts of melamine modified phenolic resin, 17 parts of cyclohexanone peroxide, 9 parts of ammonium polyphosphate, 14 parts of polyester fiber, 2 parts of dispersant, 9 parts of hollow glass microspheres, 7 parts of nano silicon carbide, 7 parts of zinc borate, 11 parts of composite carbon powder, 14 parts of monoalkoxy titanate, 6 parts of glycidyloxypropyl trimethoxy silane, 3 parts of tributyl phosphate and 2 parts of antioxidant.

[0048] The polyester fiber has a diameter of 24 microns, a length of 400 microns, and a melting point of 250 degrees Celsius. The dispersant is mannitol. The hollow glass microbeads have a particle size of 70 microns. The nano-silicon carbide has a particle size of 70 nanometers.

[0049] 3) Preparation of environmentally friendly fire retardant coatings

[0050] Acrylic acid-modified bisphenol A epoxy resin, melamine-modified phenolic resin, polyester fiber, dispersant, hollow glass microspheres, nano silicon carbide, zinc borate and composite carbon powder are mixed and heated at a stirring rate of 640 rpm and a heating temperature of 65 degrees Celsius, and mixed and heated for 15 minutes to obtain a suspension; cyclohexanone peroxide, ammonium polyphosphate, monoalkoxy titanate, glycidyloxypropyl trimethoxy silane, tributyl phosphate and an antioxidant are added to the suspension and mixed and heated at a stirring rate of 650 rpm and a heating temperature of 65 degrees Celsius, and mixed and heated for 75 minutes to obtain an environmentally friendly fire retardant coating.

[0051] 4) Construction

[0052] The environmentally friendly fireproof coating is mixed with water and then coated on the surface of the heat shrinkable tube, the mass percentage of water is 20%, and the coating thickness is 140 microns. The heat shrinkable tube is a polyethylene heat shrinkable tube (inner diameter 10 mm, wall thickness 2 mm).

[0053] Comparative Example 1

[0054] 1) Weigh the raw materials

[0055] 140 parts of acrylic acid modified bisphenol A type epoxy resin, 35 parts of melamine modified phenolic resin, 18 parts of cyclohexanone peroxide, 10 parts of ammonium polyphosphate, 11 parts of glass fiber, 10 parts of hollow glass microspheres, 8 parts of nano silicon carbide, 8 parts of zinc borate, 12 parts of quartz sand, 15 parts of monoalkoxy titanate, 7 parts of glycidyloxypropyl trimethoxy silane, 3 parts of tributyl phosphate and 2 parts of antioxidant.

[0056] The glass fiber has a diameter of 24 micrometers and a length of 400 micrometers, the hollow glass microbead has a particle size of 70 micrometers, and the nano-silicon carbide has a particle size of 70 nanometers.

[0057] 2) Preparation of fire retardant coating

[0058] All materials were stirred and mixed at 600 rpm and heated to 65 degrees Celsius, stirred for 1.5 hours, and cooled to room temperature to obtain a fire retardant coating.

[0059] 3) Construction

[0060] Mix the fire retardant coating with water evenly and apply it on the surface of the heat shrink tubing. The coating thickness is 120 microns and the mass percentage of water is 15%.

[0061] Comparative Example 2

[0062] Powder coating with 2% polyester fiber content, the weight ratio of coating to solvent is 7:3, and the solvent is industrial alcohol. Apply it on the surface of the heat shrink tubing, and the coating thickness is 120 microns.

[0063] Heat shrink test

[0064] 1) Experimental purpose: Each embodiment and comparative example is subjected to heat shrinkage heating using an alcohol burner to observe whether each coating has wrinkles, cracks, and hot melting.

[0065] 2) Experimental method: The cured coated heat shrink tubing obtained in each embodiment and comparative example was sprayed with an alcohol burner for 3 weeks to shrink each heat shrink tubing to a working state, and whether each coating had wrinkles, cracks, or heat melting was observed and recorded in Table 1.

[0066] 3) Experimental results, see Table 1

[0067]

[0068] Obviously, it can be seen from Table 1 that the coating obtained by the present invention can achieve good shrinkage when used for heat shrinkable sleeves. Except for wrinkles in Example 2, wrinkles, cracks, hot melting and other conditions that damage the coating function did not occur in other embodiments. While ordinary fire retardant coatings can play a fire retardant role, because cracks and other conditions already exist, it is impossible to ensure the coating function for a long time in actual use.

[0069] Anti-condensation test

[0070] 1) Experimental purpose: The coatings obtained in each embodiment and comparative example were subjected to a condensation test to test whether they have an anti-condensation function.

[0071] 2) Experimental method: The cured coated heat shrink tubing obtained in each embodiment and comparative example was heat shrunk on the outer periphery of the refrigeration pipe. The coolant temperature in the refrigeration pipe was 15 degrees Celsius, the working environment temperature was 30 degrees Celsius, and the relative humidity of the air was 70%. After 10 hours, the coating surface was observed for condensation, and the result was recorded in Table 2.

[0072] 3) Experimental results, see Table 2

[0073]

[0074] It can be seen from Table 2 that the coating obtained by the present invention has excellent anti-condensation function when cured on a substrate prone to condensation, while Comparative Example 1 with similar components does not have this function, and Comparative Example 2 with polyester fiber also cannot achieve this function.

[0075] The above embodiments and descriptions are only for illustrating the principles and best embodiments of the present invention. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and improvements, all of which fall within the scope of the present invention to be protected.

Claims

1. A method for preparing an environmentally friendly fire retardant coating, It is characterized in that The following steps are involved: 1) Preparation of composite carbon powder Water, titanium dioxide, aqueous dispersant and bamboo charcoal particles were weighed in a mass ratio of 1000:5:3:100, stirred at 1500 rpm for 20 minutes, and then filtered to remove the water. The filter cake was crushed through a 200-mesh sieve to obtain composite carbon powder. 2) Weigh the raw materials 125 parts of acrylic acid modified bisphenol A type epoxy resin, 30 parts of melamine modified phenolic resin, 15 parts of cyclohexanone peroxide, 7 parts of ammonium polyphosphate, 13 parts of polyester fiber, 1.5 parts of dispersant, 7 parts of hollow glass microspheres, 6 parts of nano silicon carbide, 6 parts of zinc borate, 9 parts of composite carbon powder, 13 parts of monoalkoxy titanate, 5 parts of glycidyloxypropyl trimethoxy silane, 2 parts of tributyl phosphate and 1.5 parts of antioxidant; The polyester fiber has a diameter of 20 microns, a length of 400 microns, and a melting point of 255 degrees Celsius; the dispersant is mannitol; the hollow glass microbeads have a particle size of 70 microns; and the nano-silicon carbide has a particle size of 60 nanometers; 3) Preparation of environmentally friendly fire retardant coatings Acrylic acid-modified bisphenol A epoxy resin, melamine-modified phenolic resin, polyester fiber, dispersant, hollow glass microspheres, nano silicon carbide, zinc borate and composite carbon powder are mixed and heated, the stirring speed is 600 rpm, the heating temperature is 65 degrees Celsius, and the mixing and heating is performed for 15 minutes to obtain a suspension; cyclohexanone peroxide, ammonium polyphosphate, monoalkoxy titanate, glycidyl ether oxypropyl trimethoxy silane, tributyl phosphate and an antioxidant are added to the suspension and mixed and heated, the stirring speed is 600 rpm, the heating temperature is 65 degrees Celsius, and the mixing and heating is performed for 75 minutes to obtain an environmentally friendly fire retardant coating; 4) Construction Mix the environmentally friendly fire retardant coating with water and apply it on the surface of the heat shrink tubing. The mass percentage of water is 15% and the coating thickness is 120 microns. Alternatively, include the following steps: 1) Preparation of composite carbon powder Water, titanium dioxide, aqueous dispersant and bamboo charcoal particles were weighed in a mass ratio of 1000:5:3:100, stirred at 1500 rpm for 20 minutes, and then filtered to remove the water. The filter cake was crushed through a 200-mesh sieve to obtain composite carbon powder. 2) Weigh the raw materials 140 parts of acrylic acid modified bisphenol A type epoxy resin, 34 parts of melamine modified phenolic resin, 17 parts of cyclohexanone peroxide, 9 parts of ammonium polyphosphate, 14 parts of polyester fiber, 2 parts of dispersant, 9 parts of hollow glass microspheres, 7 parts of nano silicon carbide, 7 parts of zinc borate, 11 parts of composite carbon powder, 14 parts of monoalkoxy titanate, 6 parts of glycidyloxypropyl trimethoxy silane, 3 parts of tributyl phosphate and 2 parts of antioxidant; The polyester fiber has a diameter of 24 microns, a length of 400 microns, and a melting point of 250 degrees Celsius; the dispersant is mannitol; the hollow glass microbeads have a particle size of 70 microns; and the nano-silicon carbide has a particle size of 70 nanometers; 3) Preparation of environmentally friendly fire retardant coatings Acrylic acid-modified bisphenol A epoxy resin, melamine-modified phenolic resin, polyester fiber, dispersant, hollow glass microspheres, nano silicon carbide, zinc borate and composite carbon powder are mixed and heated, the stirring speed is 640 rpm, the heating temperature is 65 degrees Celsius, and the mixing and heating is performed for 15 minutes to obtain a suspension; cyclohexanone peroxide, ammonium polyphosphate, monoalkoxy titanate, glycidyl ether oxypropyl trimethoxy silane, tributyl phosphate and an antioxidant are added to the suspension, the stirring speed is 650 rpm, the heating temperature is 65 degrees Celsius, and the mixing and heating is performed for 75 minutes to obtain an environmentally friendly fire retardant coating; 4) Construction Mix the environmentally friendly fire retardant coating with water and apply it on the surface of the heat shrink tubing. The mass percentage of water is 20% and the coating thickness is 140 microns.

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