Fire extinguishing patch and preparation method thereof

Abstract

The invention relates to a fire extinguishing patch and a preparation method thereof. At present, in the preparation of the fire extinguishing patch, the patch is influenced by an adhesive, the curing time is very long, the batch production of an assembly line cannot be realized, and the fire extinguishing performance of the fire extinguishing patch is easily influenced by the external environment during curing. A fire extinguishing patch comprises, by mass, 100 parts of a polyurethane prepolymer, 10-20 parts of an isocyanate curing agent, 1-5 parts of a photoinitiator and 20-30 parts of fire extinguishing microcapsules, and a preparation method of the fire extinguishing patch comprises the following steps: preparing an adhesive solution; adding the fire-extinguishing microcapsules into the adhesive solution for a plurality of times; dropping the adhesive solution added with the fire extinguishing microcapsules into a patch mold, and putting the patch mold on a low-frequency ultrasonic vibration table for vibration; the surface mounting mold after vibration is subjected to standing; and curing the patch mold after standing by using ultraviolet light, and taking out the patch from the patch mold after curing, so as to obtain the fire extinguishing patch. The fire extinguishing patch is short in production time and can be produced in batches, and the fire extinguishing performance is not prone to being affected.

Description

Technical Field

[0001] The invention relates to the technical field of fire fighting and extinguishing, and in particular to a fire extinguishing patch and a preparation method thereof. Background Art

[0002] Fire extinguishing patches are a type of automatic fire extinguishing device that is pasted on objects that need to be prevented from fire. Chemicals are placed inside the fire extinguishing patches to extinguish fires. Different types of fire extinguishing patches contain different ingredients, which can produce chemical reactions when a fire breaks out or the temperature changes, and automatically spray out to extinguish the fire.

[0003] Fire extinguishing patches can be used for fire extinguishing protection in flammable and explosive places such as electronic equipment, automobiles, and ships to improve fire prevention and control capabilities, especially for fire-prone points in confined and narrow spaces, such as cable connection points of electrical boxes, transformer substations, power supply cabinets and other equipment.

[0004] The fire extinguishing patch is a patch made of fire extinguishing microcapsules through an adhesive. However, in the preparation of the fire extinguishing patch, the patch takes a long time to cure due to the influence of the adhesive, and it is impossible to achieve mass production on the assembly line. In addition, the external environment during curing is likely to affect the fire extinguishing performance of the fire extinguishing patch. Summary of the invention

[0005] The purpose of the present invention is to provide a fire extinguishing patch and a preparation method thereof, so as to at least solve the problems that the current fire extinguishing patch has a long production time, cannot be mass-produced, and the fire extinguishing performance is easily affected.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A fire extinguishing patch, the mass ratio of the fire extinguishing patch is:

[0008]

[0009] Furthermore, the polyurethane prepolymer is a TDI-TMP polymer or an MDI polymer.

[0010] Furthermore, the isocyanate curing agent is a TDI curing agent or an MDI curing agent.

[0011] Furthermore, the photoinitiator is 2,4,6-diphenylphosphine oxide or isopropylthioxanthone.

[0012] Furthermore, the thickness of the fire extinguishing patch is less than 10 mm.

[0013] A method for preparing a fire extinguishing patch, the steps of the preparation method are as follows:

[0014] The polyurethane prepolymer, the isocyanate curing agent and the photoinitiator are mixed and stirred uniformly to prepare an adhesive solution;

[0015] Adding the fire extinguishing microcapsules into the adhesive solution several times and stirring evenly;

[0016] The adhesive solution containing the fire-extinguishing microcapsules is dripped into a patch mold, and the patch mold is placed on a low-frequency ultrasonic vibration table and vibrated for at least 30 seconds;

[0017] The vibrated patch mold is placed in an environment with a temperature of 30 to 50° C. and allowed to stand for at least 5 minutes;

[0018] The patch mold after standing still is cured by ultraviolet light, and the patch is taken out from the patch mold after curing to obtain a fire extinguishing patch.

[0019] Furthermore, if the density of the fire extinguishing microcapsules is lower than that of the adhesive solution, the fire extinguishing microcapsules are added to the adhesive solution three times, and a substrate is first placed at the bottom of the patch mold, and then the adhesive solution with the fire extinguishing microcapsules is dripped into the patch mold.

[0020] Further, 50% of the total amount is added for the first time, 35% of the total amount is added for the second time, and 15% of the total amount is added for the third time, with at least 1 minute interval between each addition.

[0021] Furthermore, if the density of the fire extinguishing microcapsules is greater than the density of the adhesive solution, the fire extinguishing microcapsules are added to the adhesive solution twice, and the vibrated patch mold is left to stand, and the substrate is covered on top of the patch mold.

[0022] Further, 75% of the total amount is added for the first time, and 25% of the total amount is added for the second time, with at least 1 minute interval between each addition.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention uses ultrasonic vibration to further even out the fraction of fire extinguishing particles, and enables the fire extinguishing particles to sink or float to the surface of the fire extinguishing patch at an accelerated speed. At the same time, the bubbles in the solution can be discharged, and the fire extinguishing performance will not be affected by the generation of bubbles. The fire extinguishing patch can be quickly initially cured in a warm environment and completely cured by ultraviolet light, thereby shortening the production time of the fire extinguishing patch and enabling assembly line batch production.

[0025] 2. In the process of preparing the fire extinguishing patch, the density of the required adhesive solution can be adjusted according to the density of the fire extinguishing microcapsules, and the substrate can be placed in the patch mold in advance, or the substrate can be placed after standing in a warm environment. The fire extinguishing microcapsules of appropriate density can also be selected according to the density of the adhesive solution, so that the preparation conditions are wide and the preparation is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention 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, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, drawings of other embodiments can be obtained based on these drawings without paying creative work.

[0027] Figure 1 The present invention is a flow chart of a method for preparing a fire extinguishing patch. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the present invention, preferred embodiments of the present invention are provided in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0029] In the description of the present invention, it is to be understood that all the techniques and scientific terms used have the same meanings as those generally understood by those of ordinary skill in the art to which the present invention belongs. When there is a contradiction, the definition in this specification shall prevail. If not otherwise specified, the technical means used in the embodiments are conventional means well known to those skilled in the art, the reagents used in the embodiments are commercially available products, and the devices used in the embodiments are existing devices, and the limitation of means, reagents or devices cannot be understood as limitation of the present invention, and the means, reagents or devices for solving the same technical problems of the same type are within the protection scope of the present invention.

[0030] In the description of the present invention, it is to be understood that when an amount, concentration, or other value or parameter is expressed as a range, a preferred range, or a range limited by a series of upper preferred values ​​and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pairing of any range upper limit or preferred value with any range lower limit or preferred value, regardless of whether the range is disclosed separately. When a numerical range is described in this article, unless otherwise stated, the range is intended to include its end value and all integers and fractions within the range.

[0031] It should also be noted that although the order of steps is mentioned in the method description, in some cases, they may be performed in an order different from that shown here, and it should not be understood as a limitation on the order of steps.

[0032] The present invention provides a fire extinguishing patch, the mass ratio of which is:

[0033]

[0034]

[0035] The polyurethane prepolymer is a TDI-TMP (toluene diisocyanate-trimethylolpropane) polymer or an MDI (diphenylmethane diisocyanate) polymer.

[0036] The isocyanate curing agent is a TDI (toluene diisocyanate) curing agent or an MDI curing agent.

[0037] The photoinitiator is 2,4,6-diphenylphosphine oxide or isopropylthioxanthone.

[0038] The thickness of the fire extinguishing patch is less than 10 mm.

[0039] like Figure 1 As shown, the present invention provides a method for preparing a fire extinguishing patch, the steps are as follows:

[0040] S1: mixing and stirring the polyurethane prepolymer, isocyanate curing agent and photoinitiator to prepare an adhesive solution;

[0041] S2: adding the fire extinguishing microcapsules into the adhesive solution in several portions and stirring evenly;

[0042] If the density of the fire extinguishing microcapsules is less than the density of the binder solution, the fire extinguishing microcapsules are added to the binder solution three times, 50% of the total amount is added for the first time, 35% of the total amount is added for the second time, and 15% of the total amount is added for the third time, with at least 1 minute interval between each addition;

[0043] If the density of the fire extinguishing microcapsules is greater than that of the binder solution, the fire extinguishing microcapsules are added to the binder solution twice, 75% of the total amount is added for the first time, and 25% of the total amount is added for the second time, with at least 1 minute interval between each addition.

[0044] S3: dripping the adhesive solution with the fire extinguishing microcapsules into the patch mold, and placing the patch mold on a low-frequency ultrasonic vibration table to vibrate for at least 30 seconds;

[0045] The frequency of low frequency is 20kHz-50kHz;

[0046] If the density of the fire extinguishing microcapsules is less than the density of the adhesive solution, a substrate is first placed at the bottom of the patch mold, and then the adhesive solution with the fire extinguishing microcapsules added is dripped into the patch mold.

[0047] S4: placing the vibrated patch mold in an environment with a temperature of 30-50° C. and letting it stand for at least 5 minutes;

[0048] If the density of the fire extinguishing microcapsules is greater than the density of the adhesive solution, the vibrated patch mold is left to stand still, and the substrate is covered on top of the patch mold.

[0049] S5: curing the patch mold after standing still using ultraviolet light, and taking the patch out of the patch mold after curing to obtain a fire extinguishing patch.

[0050] In the present invention, the substrate is one of a plastic sheet, an acrylic sheet or a metal sheet, and the substrate is provided with a backing adhesive on the opposite side of the fire extinguishing patch.

[0051] Embodiment 1:

[0052] A fire extinguishing patch, the mass ratio is:

[0053]

[0054] A method for preparing a fire extinguishing patch, the steps are as follows:

[0055] S1: 100 g of TDI-TMP polymer, 10 g of TDI curing agent and 2 g of 2,4,6-diphenylphosphine oxide were mixed and stirred to prepare an adhesive solution;

[0056] S2: adding 20g of fire extinguishing microcapsules with a density greater than that of the adhesive solution into the adhesive solution twice, the first time adding 75% of the total amount, the second time adding 25% of the total amount, each addition interval is 1min, and stirring is performed evenly;

[0057] S3: dripping the adhesive solution with the fire extinguishing microcapsules into the patch mold, and placing the fire extinguishing patch mold on an ultrasonic vibration table with a frequency of 50 kHz to vibrate for 30 seconds;

[0058] S4: placing the vibrated patch mold in an environment with a temperature of 50° C. and letting it stand for 5 minutes, and then covering the patch mold with a plastic sheet;

[0059] S5: curing the patch mold after standing still using ultraviolet light with a wavelength of 365nm, and taking the patch out of the patch mold after curing to obtain a fire extinguishing patch.

[0060] Among them, the size of the patch mold is 110mm×70mm×60mm, and the size of the fire extinguishing patch is 100mm×60mm×50mm.

[0061] Embodiment 2:

[0062] A fire extinguishing patch, the mass ratio is:

[0063]

[0064]

[0065] A method for preparing a fire extinguishing patch, the steps are as follows:

[0066] S1: 100 g of TDI-TMP polymer, 15 g of MDI curing agent and 3 g of 2,4,6-diphenylphosphine oxide were mixed and stirred to prepare an adhesive solution;

[0067] S2: adding 25 g of fire extinguishing microcapsules having a density greater than that of the adhesive solution into the adhesive solution in two portions, the first portion being 75% of the total amount, and the second portion being 25% of the total amount, with an interval of 2 minutes between each addition, and stirring evenly;

[0068] S3: dripping the adhesive solution with the fire extinguishing microcapsules into the patch mold, and placing the fire extinguishing patch mold on an ultrasonic vibration table with a frequency of 30 kHz to vibrate for 40 seconds;

[0069] S4: placing the vibrated patch mold in an environment with a temperature of 40° C. and letting it stand for 6 minutes, and then covering the patch mold with an acrylic sheet;

[0070] S5: curing the patch mold after standing still using ultraviolet light with a wavelength of 365nm, and taking the patch out of the patch mold after curing to obtain a fire extinguishing patch.

[0071] Among them, the size of the patch mold is 110mm×70mm×60mm, and the size of the fire extinguishing patch is 100mm×60mm×50mm.

[0072] Embodiment 3:

[0073] A fire extinguishing patch, the mass ratio is:

[0074]

[0075] A method for preparing a fire extinguishing patch, the steps are as follows:

[0076] S1: 200 g of MDI polymer, 40 g of MDI curing agent and 10 g of isopropylthioxanthone were mixed and stirred to prepare an adhesive solution;

[0077] S2: adding 60g of fire extinguishing microcapsules with a density less than that of the adhesive solution into the adhesive solution in three times, with the first addition accounting for 50% of the total amount, the second addition accounting for 35% of the total amount, and the third addition accounting for 15% of the total amount, with an interval of 3min between each addition, and stirring evenly;

[0078] S3: placing a substrate at the bottom of the patch mold, dripping the adhesive solution with fire extinguishing microcapsules into the patch mold, and placing the fire extinguishing patch mold on an ultrasonic vibration table with a frequency of 20 kHz to vibrate for 50 seconds;

[0079] S4: placing the vibrated patch mold in an environment with a temperature of 30° C. and letting it stand for 8 minutes;

[0080] S5: curing the patch mold after standing still using ultraviolet light with a wavelength of 395nm, and taking the patch out of the patch mold after curing to obtain a fire extinguishing patch.

[0081] Among them, the size of the patch mold is 110mm×70mm×90mm, and the size of the fire extinguishing patch is 100mm×60mm×80mm.

[0082] The present invention has also carried out verification test, as follows:

[0083] By adding 20 ml of n-heptane to the bottom of a relatively closed box space of 10 L, and sticking the fire extinguishing patch of the present invention on the top of the box, the fire extinguishing effect of the fire extinguishing patch was verified, and the data are as follows:

[0084]

[0085] In summary, the higher the content of the fire extinguishing microcapsules in the fire extinguishing patch of the present invention, the more fire extinguishing times there are, which shows that the fire extinguishing performance is not affected.

[0086] The above specific examples are used to illustrate the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the art, according to the concept of the present invention, some simple deductions, modifications or substitutions can be made.

Claims

1. A fire extinguishing patch, characterized in that: The mass ratio of the fire extinguishing patch is:

2. A fire extinguishing patch according to claim 1, characterized in that: The polyurethane prepolymer is a TDI-TMP polymer or an MDI polymer.

3. A fire extinguishing patch according to claim 1, characterized in that: The isocyanate curing agent is a TDI curing agent or an MDI curing agent.

4. A fire extinguishing patch according to claim 1, characterized in that: The photoinitiator is 2,4,6-diphenylphosphine oxide or isopropylthioxanthone.

5. A fire extinguishing patch according to claim 1, characterized in that: The thickness of the fire extinguishing patch is less than 10 mm.

6. A method for preparing a fire extinguishing patch according to any one of claims 1 to 5, characterized in that: The steps of the preparation method are as follows: The polyurethane prepolymer, the isocyanate curing agent and the photoinitiator are mixed and stirred uniformly to prepare an adhesive solution; Adding the fire extinguishing microcapsules into the adhesive solution several times and stirring evenly; The adhesive solution containing the fire-extinguishing microcapsules is dripped into a patch mold, and the patch mold is placed on a low-frequency ultrasonic vibration table and vibrated for at least 30 seconds; The vibrated patch mold is placed in an environment with a temperature of 30 to 50° C. and allowed to stand for at least 5 minutes; The patch mold after standing still is cured by ultraviolet light, and the patch is taken out from the patch mold after curing to obtain a fire extinguishing patch.

7. The method for preparing a fire extinguishing patch according to claim 6, characterized in that: If the density of the fire extinguishing microcapsules is less than the density of the adhesive solution, the fire extinguishing microcapsules are added to the adhesive solution three times, and a substrate is first placed at the bottom of the patch mold, and then the adhesive solution with the fire extinguishing microcapsules is dripped into the patch mold.

8. The method for preparing a fire extinguishing patch according to claim 7, characterized in that: The first addition is 50% of the total amount, the second addition is 35% of the total amount, and the third addition is 15% of the total amount. There is at least 1 minute interval between each addition.

9. The method for preparing a fire extinguishing patch according to claim 6, characterized in that: If the density of the fire extinguishing microcapsules is greater than the density of the adhesive solution, the fire extinguishing microcapsules are added to the adhesive solution twice, and the vibrated patch mold is left to stand, and the substrate is covered on top of the patch mold.

10. The method for preparing a fire extinguishing patch according to claim 9, characterized in that: The first addition was 75% of the total amount, and the second addition was 25% of the total amount, with at least 1 minute interval between each addition.

Images